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![Chen Zhou](/assets/img/avatar_default.png)
Fixes gcc '-Wunused-but-set-variable' warning: drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c: In function ibmvscsis_send_messages: drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c:1888:19: warning: variable iue set but not used [-Wunused-but-set-variable] drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c: In function ibmvscsis_queue_data_in: drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c:3806:8: warning: variable sd set but not used [-Wunused-but-set-variable] Link: https://lore.kernel.org/r/20191213064042.161840-1-chenzhou10@huawei.com Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Chen Zhou <chenzhou10@huawei.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
4153 lines
108 KiB
C
4153 lines
108 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*******************************************************************************
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* IBM Virtual SCSI Target Driver
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* Copyright (C) 2003-2005 Dave Boutcher (boutcher@us.ibm.com) IBM Corp.
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* Santiago Leon (santil@us.ibm.com) IBM Corp.
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* Linda Xie (lxie@us.ibm.com) IBM Corp.
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*
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* Copyright (C) 2005-2011 FUJITA Tomonori <tomof@acm.org>
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* Copyright (C) 2010 Nicholas A. Bellinger <nab@kernel.org>
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*
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* Authors: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
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* Authors: Michael Cyr <mikecyr@linux.vnet.ibm.com>
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*
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****************************************************************************/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/string.h>
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#include <linux/delay.h>
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#include <target/target_core_base.h>
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#include <target/target_core_fabric.h>
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#include <asm/hvcall.h>
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#include <asm/vio.h>
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#include <scsi/viosrp.h>
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#include "ibmvscsi_tgt.h"
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#define IBMVSCSIS_VERSION "v0.2"
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#define INITIAL_SRP_LIMIT 800
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#define DEFAULT_MAX_SECTORS 256
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#define MAX_TXU 1024 * 1024
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static uint max_vdma_size = MAX_H_COPY_RDMA;
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static char system_id[SYS_ID_NAME_LEN] = "";
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static char partition_name[PARTITION_NAMELEN] = "UNKNOWN";
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static uint partition_number = -1;
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/* Adapter list and lock to control it */
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static DEFINE_SPINLOCK(ibmvscsis_dev_lock);
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static LIST_HEAD(ibmvscsis_dev_list);
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static long ibmvscsis_parse_command(struct scsi_info *vscsi,
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struct viosrp_crq *crq);
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static void ibmvscsis_adapter_idle(struct scsi_info *vscsi);
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static void ibmvscsis_determine_resid(struct se_cmd *se_cmd,
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struct srp_rsp *rsp)
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{
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u32 residual_count = se_cmd->residual_count;
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if (!residual_count)
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return;
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if (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
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if (se_cmd->data_direction == DMA_TO_DEVICE) {
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/* residual data from an underflow write */
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rsp->flags = SRP_RSP_FLAG_DOUNDER;
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rsp->data_out_res_cnt = cpu_to_be32(residual_count);
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} else if (se_cmd->data_direction == DMA_FROM_DEVICE) {
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/* residual data from an underflow read */
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rsp->flags = SRP_RSP_FLAG_DIUNDER;
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rsp->data_in_res_cnt = cpu_to_be32(residual_count);
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}
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} else if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
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if (se_cmd->data_direction == DMA_TO_DEVICE) {
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/* residual data from an overflow write */
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rsp->flags = SRP_RSP_FLAG_DOOVER;
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rsp->data_out_res_cnt = cpu_to_be32(residual_count);
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} else if (se_cmd->data_direction == DMA_FROM_DEVICE) {
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/* residual data from an overflow read */
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rsp->flags = SRP_RSP_FLAG_DIOVER;
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rsp->data_in_res_cnt = cpu_to_be32(residual_count);
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}
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}
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}
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/**
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* connection_broken() - Determine if the connection to the client is good
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* @vscsi: Pointer to our adapter structure
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*
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* This function attempts to send a ping MAD to the client. If the call to
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* queue the request returns H_CLOSED then the connection has been broken
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* and the function returns TRUE.
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*
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* EXECUTION ENVIRONMENT:
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* Interrupt or Process environment
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*/
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static bool connection_broken(struct scsi_info *vscsi)
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{
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struct viosrp_crq *crq;
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u64 buffer[2] = { 0, 0 };
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long h_return_code;
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bool rc = false;
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/* create a PING crq */
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crq = (struct viosrp_crq *)&buffer;
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crq->valid = VALID_CMD_RESP_EL;
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crq->format = MESSAGE_IN_CRQ;
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crq->status = PING;
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h_return_code = h_send_crq(vscsi->dds.unit_id,
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cpu_to_be64(buffer[MSG_HI]),
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cpu_to_be64(buffer[MSG_LOW]));
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dev_dbg(&vscsi->dev, "Connection_broken: rc %ld\n", h_return_code);
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if (h_return_code == H_CLOSED)
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rc = true;
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return rc;
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}
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/**
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* ibmvscsis_unregister_command_q() - Helper Function-Unregister Command Queue
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* @vscsi: Pointer to our adapter structure
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*
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* This function calls h_free_q then frees the interrupt bit etc.
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* It must release the lock before doing so because of the time it can take
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* for h_free_crq in PHYP
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* NOTE: the caller must make sure that state and or flags will prevent
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* interrupt handler from scheduling work.
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* NOTE: anyone calling this function may need to set the CRQ_CLOSED flag
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* we can't do it here, because we don't have the lock
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*
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* EXECUTION ENVIRONMENT:
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* Process level
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*/
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static long ibmvscsis_unregister_command_q(struct scsi_info *vscsi)
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{
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long qrc;
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long rc = ADAPT_SUCCESS;
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int ticks = 0;
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do {
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qrc = h_free_crq(vscsi->dds.unit_id);
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switch (qrc) {
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case H_SUCCESS:
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spin_lock_bh(&vscsi->intr_lock);
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vscsi->flags &= ~PREP_FOR_SUSPEND_FLAGS;
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spin_unlock_bh(&vscsi->intr_lock);
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break;
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case H_HARDWARE:
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case H_PARAMETER:
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dev_err(&vscsi->dev, "unregister_command_q: error from h_free_crq %ld\n",
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qrc);
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rc = ERROR;
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break;
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case H_BUSY:
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case H_LONG_BUSY_ORDER_1_MSEC:
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/* msleep not good for small values */
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usleep_range(1000, 2000);
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ticks += 1;
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break;
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case H_LONG_BUSY_ORDER_10_MSEC:
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usleep_range(10000, 20000);
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ticks += 10;
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break;
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case H_LONG_BUSY_ORDER_100_MSEC:
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msleep(100);
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ticks += 100;
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break;
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case H_LONG_BUSY_ORDER_1_SEC:
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ssleep(1);
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ticks += 1000;
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break;
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case H_LONG_BUSY_ORDER_10_SEC:
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ssleep(10);
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ticks += 10000;
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break;
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case H_LONG_BUSY_ORDER_100_SEC:
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ssleep(100);
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ticks += 100000;
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break;
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default:
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dev_err(&vscsi->dev, "unregister_command_q: unknown error %ld from h_free_crq\n",
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qrc);
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rc = ERROR;
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break;
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}
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/*
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* dont wait more then 300 seconds
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* ticks are in milliseconds more or less
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*/
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if (ticks > 300000 && qrc != H_SUCCESS) {
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rc = ERROR;
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dev_err(&vscsi->dev, "Excessive wait for h_free_crq\n");
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}
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} while (qrc != H_SUCCESS && rc == ADAPT_SUCCESS);
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dev_dbg(&vscsi->dev, "Freeing CRQ: phyp rc %ld, rc %ld\n", qrc, rc);
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return rc;
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}
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/**
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* ibmvscsis_delete_client_info() - Helper function to Delete Client Info
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* @vscsi: Pointer to our adapter structure
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* @client_closed: True if client closed its queue
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*
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* Deletes information specific to the client when the client goes away
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*
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* EXECUTION ENVIRONMENT:
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* Interrupt or Process
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*/
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static void ibmvscsis_delete_client_info(struct scsi_info *vscsi,
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bool client_closed)
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{
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vscsi->client_cap = 0;
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/*
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* Some things we don't want to clear if we're closing the queue,
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* because some clients don't resend the host handshake when they
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* get a transport event.
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*/
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if (client_closed)
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vscsi->client_data.os_type = 0;
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}
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/**
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* ibmvscsis_free_command_q() - Free Command Queue
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* @vscsi: Pointer to our adapter structure
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*
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* This function calls unregister_command_q, then clears interrupts and
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* any pending interrupt acknowledgments associated with the command q.
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* It also clears memory if there is no error.
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*
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* PHYP did not meet the PAPR architecture so that we must give up the
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* lock. This causes a timing hole regarding state change. To close the
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* hole this routine does accounting on any change that occurred during
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* the time the lock is not held.
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* NOTE: must give up and then acquire the interrupt lock, the caller must
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* make sure that state and or flags will prevent interrupt handler from
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* scheduling work.
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*
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* EXECUTION ENVIRONMENT:
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* Process level, interrupt lock is held
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*/
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static long ibmvscsis_free_command_q(struct scsi_info *vscsi)
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{
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int bytes;
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u32 flags_under_lock;
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u16 state_under_lock;
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long rc = ADAPT_SUCCESS;
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if (!(vscsi->flags & CRQ_CLOSED)) {
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vio_disable_interrupts(vscsi->dma_dev);
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state_under_lock = vscsi->new_state;
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flags_under_lock = vscsi->flags;
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vscsi->phyp_acr_state = 0;
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vscsi->phyp_acr_flags = 0;
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spin_unlock_bh(&vscsi->intr_lock);
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rc = ibmvscsis_unregister_command_q(vscsi);
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spin_lock_bh(&vscsi->intr_lock);
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if (state_under_lock != vscsi->new_state)
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vscsi->phyp_acr_state = vscsi->new_state;
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vscsi->phyp_acr_flags = ((~flags_under_lock) & vscsi->flags);
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if (rc == ADAPT_SUCCESS) {
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bytes = vscsi->cmd_q.size * PAGE_SIZE;
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memset(vscsi->cmd_q.base_addr, 0, bytes);
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vscsi->cmd_q.index = 0;
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vscsi->flags |= CRQ_CLOSED;
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ibmvscsis_delete_client_info(vscsi, false);
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}
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dev_dbg(&vscsi->dev, "free_command_q: flags 0x%x, state 0x%hx, acr_flags 0x%x, acr_state 0x%hx\n",
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vscsi->flags, vscsi->state, vscsi->phyp_acr_flags,
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vscsi->phyp_acr_state);
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}
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return rc;
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}
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/**
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* ibmvscsis_cmd_q_dequeue() - Get valid Command element
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* @mask: Mask to use in case index wraps
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* @current_index: Current index into command queue
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* @base_addr: Pointer to start of command queue
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*
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* Returns a pointer to a valid command element or NULL, if the command
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* queue is empty
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*
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* EXECUTION ENVIRONMENT:
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* Interrupt environment, interrupt lock held
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*/
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static struct viosrp_crq *ibmvscsis_cmd_q_dequeue(uint mask,
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uint *current_index,
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struct viosrp_crq *base_addr)
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{
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struct viosrp_crq *ptr;
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ptr = base_addr + *current_index;
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if (ptr->valid) {
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*current_index = (*current_index + 1) & mask;
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dma_rmb();
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} else {
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ptr = NULL;
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}
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return ptr;
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}
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/**
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* ibmvscsis_send_init_message() - send initialize message to the client
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* @vscsi: Pointer to our adapter structure
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* @format: Which Init Message format to send
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*
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* EXECUTION ENVIRONMENT:
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* Interrupt environment interrupt lock held
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*/
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static long ibmvscsis_send_init_message(struct scsi_info *vscsi, u8 format)
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{
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struct viosrp_crq *crq;
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u64 buffer[2] = { 0, 0 };
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long rc;
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crq = (struct viosrp_crq *)&buffer;
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crq->valid = VALID_INIT_MSG;
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crq->format = format;
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rc = h_send_crq(vscsi->dds.unit_id, cpu_to_be64(buffer[MSG_HI]),
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cpu_to_be64(buffer[MSG_LOW]));
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return rc;
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}
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/**
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* ibmvscsis_check_init_msg() - Check init message valid
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* @vscsi: Pointer to our adapter structure
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* @format: Pointer to return format of Init Message, if any.
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* Set to UNUSED_FORMAT if no Init Message in queue.
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*
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* Checks if an initialize message was queued by the initiatior
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* after the queue was created and before the interrupt was enabled.
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*
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* EXECUTION ENVIRONMENT:
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* Process level only, interrupt lock held
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*/
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static long ibmvscsis_check_init_msg(struct scsi_info *vscsi, uint *format)
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{
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struct viosrp_crq *crq;
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long rc = ADAPT_SUCCESS;
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crq = ibmvscsis_cmd_q_dequeue(vscsi->cmd_q.mask, &vscsi->cmd_q.index,
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vscsi->cmd_q.base_addr);
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if (!crq) {
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*format = (uint)UNUSED_FORMAT;
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} else if (crq->valid == VALID_INIT_MSG && crq->format == INIT_MSG) {
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*format = (uint)INIT_MSG;
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crq->valid = INVALIDATE_CMD_RESP_EL;
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dma_rmb();
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/*
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* the caller has ensured no initialize message was
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* sent after the queue was
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* created so there should be no other message on the queue.
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*/
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crq = ibmvscsis_cmd_q_dequeue(vscsi->cmd_q.mask,
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&vscsi->cmd_q.index,
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vscsi->cmd_q.base_addr);
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if (crq) {
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*format = (uint)(crq->format);
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rc = ERROR;
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crq->valid = INVALIDATE_CMD_RESP_EL;
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dma_rmb();
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}
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} else {
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*format = (uint)(crq->format);
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rc = ERROR;
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crq->valid = INVALIDATE_CMD_RESP_EL;
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dma_rmb();
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}
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return rc;
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}
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/**
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* ibmvscsis_disconnect() - Helper function to disconnect
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* @work: Pointer to work_struct, gives access to our adapter structure
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*
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* An error has occurred or the driver received a Transport event,
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* and the driver is requesting that the command queue be de-registered
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* in a safe manner. If there is no outstanding I/O then we can stop the
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* queue. If we are restarting the queue it will be reflected in the
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* the state of the adapter.
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*
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* EXECUTION ENVIRONMENT:
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* Process environment
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*/
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static void ibmvscsis_disconnect(struct work_struct *work)
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{
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struct scsi_info *vscsi = container_of(work, struct scsi_info,
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proc_work);
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u16 new_state;
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bool wait_idle = false;
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spin_lock_bh(&vscsi->intr_lock);
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new_state = vscsi->new_state;
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vscsi->new_state = 0;
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vscsi->flags |= DISCONNECT_SCHEDULED;
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vscsi->flags &= ~SCHEDULE_DISCONNECT;
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dev_dbg(&vscsi->dev, "disconnect: flags 0x%x, state 0x%hx\n",
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vscsi->flags, vscsi->state);
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/*
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* check which state we are in and see if we
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* should transitition to the new state
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*/
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switch (vscsi->state) {
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/* Should never be called while in this state. */
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case NO_QUEUE:
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/*
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* Can never transition from this state;
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* igonore errors and logout.
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*/
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case UNCONFIGURING:
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break;
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/* can transition from this state to UNCONFIGURING */
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case ERR_DISCONNECT:
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if (new_state == UNCONFIGURING)
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vscsi->state = new_state;
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break;
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/*
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* Can transition from this state to to unconfiguring
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* or err disconnect.
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*/
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case ERR_DISCONNECT_RECONNECT:
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switch (new_state) {
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case UNCONFIGURING:
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case ERR_DISCONNECT:
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vscsi->state = new_state;
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break;
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case WAIT_IDLE:
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break;
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default:
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break;
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}
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break;
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/* can transition from this state to UNCONFIGURING */
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case ERR_DISCONNECTED:
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if (new_state == UNCONFIGURING)
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vscsi->state = new_state;
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break;
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case WAIT_ENABLED:
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switch (new_state) {
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case UNCONFIGURING:
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vscsi->state = new_state;
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vscsi->flags |= RESPONSE_Q_DOWN;
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vscsi->flags &= ~(SCHEDULE_DISCONNECT |
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DISCONNECT_SCHEDULED);
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dma_rmb();
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if (vscsi->flags & CFG_SLEEPING) {
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vscsi->flags &= ~CFG_SLEEPING;
|
|
complete(&vscsi->unconfig);
|
|
}
|
|
break;
|
|
|
|
/* should never happen */
|
|
case ERR_DISCONNECT:
|
|
case ERR_DISCONNECT_RECONNECT:
|
|
case WAIT_IDLE:
|
|
dev_err(&vscsi->dev, "disconnect: invalid state %d for WAIT_IDLE\n",
|
|
vscsi->state);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case WAIT_IDLE:
|
|
switch (new_state) {
|
|
case UNCONFIGURING:
|
|
vscsi->flags |= RESPONSE_Q_DOWN;
|
|
vscsi->state = new_state;
|
|
vscsi->flags &= ~(SCHEDULE_DISCONNECT |
|
|
DISCONNECT_SCHEDULED);
|
|
ibmvscsis_free_command_q(vscsi);
|
|
break;
|
|
case ERR_DISCONNECT:
|
|
case ERR_DISCONNECT_RECONNECT:
|
|
vscsi->state = new_state;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
/*
|
|
* Initiator has not done a successful srp login
|
|
* or has done a successful srp logout ( adapter was not
|
|
* busy). In the first case there can be responses queued
|
|
* waiting for space on the initiators response queue (MAD)
|
|
* The second case the adapter is idle. Assume the worse case,
|
|
* i.e. the second case.
|
|
*/
|
|
case WAIT_CONNECTION:
|
|
case CONNECTED:
|
|
case SRP_PROCESSING:
|
|
wait_idle = true;
|
|
vscsi->state = new_state;
|
|
break;
|
|
|
|
/* can transition from this state to UNCONFIGURING */
|
|
case UNDEFINED:
|
|
if (new_state == UNCONFIGURING)
|
|
vscsi->state = new_state;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (wait_idle) {
|
|
dev_dbg(&vscsi->dev, "disconnect start wait, active %d, sched %d\n",
|
|
(int)list_empty(&vscsi->active_q),
|
|
(int)list_empty(&vscsi->schedule_q));
|
|
if (!list_empty(&vscsi->active_q) ||
|
|
!list_empty(&vscsi->schedule_q)) {
|
|
vscsi->flags |= WAIT_FOR_IDLE;
|
|
dev_dbg(&vscsi->dev, "disconnect flags 0x%x\n",
|
|
vscsi->flags);
|
|
/*
|
|
* This routine is can not be called with the interrupt
|
|
* lock held.
|
|
*/
|
|
spin_unlock_bh(&vscsi->intr_lock);
|
|
wait_for_completion(&vscsi->wait_idle);
|
|
spin_lock_bh(&vscsi->intr_lock);
|
|
}
|
|
dev_dbg(&vscsi->dev, "disconnect stop wait\n");
|
|
|
|
ibmvscsis_adapter_idle(vscsi);
|
|
}
|
|
|
|
spin_unlock_bh(&vscsi->intr_lock);
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_post_disconnect() - Schedule the disconnect
|
|
* @vscsi: Pointer to our adapter structure
|
|
* @new_state: State to move to after disconnecting
|
|
* @flag_bits: Flags to turn on in adapter structure
|
|
*
|
|
* If it's already been scheduled, then see if we need to "upgrade"
|
|
* the new state (if the one passed in is more "severe" than the
|
|
* previous one).
|
|
*
|
|
* PRECONDITION:
|
|
* interrupt lock is held
|
|
*/
|
|
static void ibmvscsis_post_disconnect(struct scsi_info *vscsi, uint new_state,
|
|
uint flag_bits)
|
|
{
|
|
uint state;
|
|
|
|
/* check the validity of the new state */
|
|
switch (new_state) {
|
|
case UNCONFIGURING:
|
|
case ERR_DISCONNECT:
|
|
case ERR_DISCONNECT_RECONNECT:
|
|
case WAIT_IDLE:
|
|
break;
|
|
|
|
default:
|
|
dev_err(&vscsi->dev, "post_disconnect: Invalid new state %d\n",
|
|
new_state);
|
|
return;
|
|
}
|
|
|
|
vscsi->flags |= flag_bits;
|
|
|
|
dev_dbg(&vscsi->dev, "post_disconnect: new_state 0x%x, flag_bits 0x%x, vscsi->flags 0x%x, state %hx\n",
|
|
new_state, flag_bits, vscsi->flags, vscsi->state);
|
|
|
|
if (!(vscsi->flags & (DISCONNECT_SCHEDULED | SCHEDULE_DISCONNECT))) {
|
|
vscsi->flags |= SCHEDULE_DISCONNECT;
|
|
vscsi->new_state = new_state;
|
|
|
|
INIT_WORK(&vscsi->proc_work, ibmvscsis_disconnect);
|
|
(void)queue_work(vscsi->work_q, &vscsi->proc_work);
|
|
} else {
|
|
if (vscsi->new_state)
|
|
state = vscsi->new_state;
|
|
else
|
|
state = vscsi->state;
|
|
|
|
switch (state) {
|
|
case NO_QUEUE:
|
|
case UNCONFIGURING:
|
|
break;
|
|
|
|
case ERR_DISCONNECTED:
|
|
case ERR_DISCONNECT:
|
|
case UNDEFINED:
|
|
if (new_state == UNCONFIGURING)
|
|
vscsi->new_state = new_state;
|
|
break;
|
|
|
|
case ERR_DISCONNECT_RECONNECT:
|
|
switch (new_state) {
|
|
case UNCONFIGURING:
|
|
case ERR_DISCONNECT:
|
|
vscsi->new_state = new_state;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case WAIT_ENABLED:
|
|
case WAIT_IDLE:
|
|
case WAIT_CONNECTION:
|
|
case CONNECTED:
|
|
case SRP_PROCESSING:
|
|
vscsi->new_state = new_state;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
dev_dbg(&vscsi->dev, "Leaving post_disconnect: flags 0x%x, new_state 0x%x\n",
|
|
vscsi->flags, vscsi->new_state);
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_handle_init_compl_msg() - Respond to an Init Complete Message
|
|
* @vscsi: Pointer to our adapter structure
|
|
*
|
|
* Must be called with interrupt lock held.
|
|
*/
|
|
static long ibmvscsis_handle_init_compl_msg(struct scsi_info *vscsi)
|
|
{
|
|
long rc = ADAPT_SUCCESS;
|
|
|
|
switch (vscsi->state) {
|
|
case NO_QUEUE:
|
|
case ERR_DISCONNECT:
|
|
case ERR_DISCONNECT_RECONNECT:
|
|
case ERR_DISCONNECTED:
|
|
case UNCONFIGURING:
|
|
case UNDEFINED:
|
|
rc = ERROR;
|
|
break;
|
|
|
|
case WAIT_CONNECTION:
|
|
vscsi->state = CONNECTED;
|
|
break;
|
|
|
|
case WAIT_IDLE:
|
|
case SRP_PROCESSING:
|
|
case CONNECTED:
|
|
case WAIT_ENABLED:
|
|
default:
|
|
rc = ERROR;
|
|
dev_err(&vscsi->dev, "init_msg: invalid state %d to get init compl msg\n",
|
|
vscsi->state);
|
|
ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
|
|
break;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_handle_init_msg() - Respond to an Init Message
|
|
* @vscsi: Pointer to our adapter structure
|
|
*
|
|
* Must be called with interrupt lock held.
|
|
*/
|
|
static long ibmvscsis_handle_init_msg(struct scsi_info *vscsi)
|
|
{
|
|
long rc = ADAPT_SUCCESS;
|
|
|
|
switch (vscsi->state) {
|
|
case WAIT_CONNECTION:
|
|
rc = ibmvscsis_send_init_message(vscsi, INIT_COMPLETE_MSG);
|
|
switch (rc) {
|
|
case H_SUCCESS:
|
|
vscsi->state = CONNECTED;
|
|
break;
|
|
|
|
case H_PARAMETER:
|
|
dev_err(&vscsi->dev, "init_msg: failed to send, rc %ld\n",
|
|
rc);
|
|
ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0);
|
|
break;
|
|
|
|
case H_DROPPED:
|
|
dev_err(&vscsi->dev, "init_msg: failed to send, rc %ld\n",
|
|
rc);
|
|
rc = ERROR;
|
|
ibmvscsis_post_disconnect(vscsi,
|
|
ERR_DISCONNECT_RECONNECT, 0);
|
|
break;
|
|
|
|
case H_CLOSED:
|
|
dev_warn(&vscsi->dev, "init_msg: failed to send, rc %ld\n",
|
|
rc);
|
|
rc = 0;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case UNDEFINED:
|
|
rc = ERROR;
|
|
break;
|
|
|
|
case UNCONFIGURING:
|
|
break;
|
|
|
|
case WAIT_ENABLED:
|
|
case CONNECTED:
|
|
case SRP_PROCESSING:
|
|
case WAIT_IDLE:
|
|
case NO_QUEUE:
|
|
case ERR_DISCONNECT:
|
|
case ERR_DISCONNECT_RECONNECT:
|
|
case ERR_DISCONNECTED:
|
|
default:
|
|
rc = ERROR;
|
|
dev_err(&vscsi->dev, "init_msg: invalid state %d to get init msg\n",
|
|
vscsi->state);
|
|
ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
|
|
break;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_init_msg() - Respond to an init message
|
|
* @vscsi: Pointer to our adapter structure
|
|
* @crq: Pointer to CRQ element containing the Init Message
|
|
*
|
|
* EXECUTION ENVIRONMENT:
|
|
* Interrupt, interrupt lock held
|
|
*/
|
|
static long ibmvscsis_init_msg(struct scsi_info *vscsi, struct viosrp_crq *crq)
|
|
{
|
|
long rc = ADAPT_SUCCESS;
|
|
|
|
dev_dbg(&vscsi->dev, "init_msg: state 0x%hx\n", vscsi->state);
|
|
|
|
rc = h_vioctl(vscsi->dds.unit_id, H_GET_PARTNER_INFO,
|
|
(u64)vscsi->map_ioba | ((u64)PAGE_SIZE << 32), 0, 0, 0,
|
|
0);
|
|
if (rc == H_SUCCESS) {
|
|
vscsi->client_data.partition_number =
|
|
be64_to_cpu(*(u64 *)vscsi->map_buf);
|
|
dev_dbg(&vscsi->dev, "init_msg, part num %d\n",
|
|
vscsi->client_data.partition_number);
|
|
} else {
|
|
dev_dbg(&vscsi->dev, "init_msg h_vioctl rc %ld\n", rc);
|
|
rc = ADAPT_SUCCESS;
|
|
}
|
|
|
|
if (crq->format == INIT_MSG) {
|
|
rc = ibmvscsis_handle_init_msg(vscsi);
|
|
} else if (crq->format == INIT_COMPLETE_MSG) {
|
|
rc = ibmvscsis_handle_init_compl_msg(vscsi);
|
|
} else {
|
|
rc = ERROR;
|
|
dev_err(&vscsi->dev, "init_msg: invalid format %d\n",
|
|
(uint)crq->format);
|
|
ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_establish_new_q() - Establish new CRQ queue
|
|
* @vscsi: Pointer to our adapter structure
|
|
*
|
|
* Must be called with interrupt lock held.
|
|
*/
|
|
static long ibmvscsis_establish_new_q(struct scsi_info *vscsi)
|
|
{
|
|
long rc = ADAPT_SUCCESS;
|
|
uint format;
|
|
|
|
rc = h_vioctl(vscsi->dds.unit_id, H_ENABLE_PREPARE_FOR_SUSPEND, 30000,
|
|
0, 0, 0, 0);
|
|
if (rc == H_SUCCESS)
|
|
vscsi->flags |= PREP_FOR_SUSPEND_ENABLED;
|
|
else if (rc != H_NOT_FOUND)
|
|
dev_err(&vscsi->dev, "Error from Enable Prepare for Suspend: %ld\n",
|
|
rc);
|
|
|
|
vscsi->flags &= PRESERVE_FLAG_FIELDS;
|
|
vscsi->rsp_q_timer.timer_pops = 0;
|
|
vscsi->debit = 0;
|
|
vscsi->credit = 0;
|
|
|
|
rc = vio_enable_interrupts(vscsi->dma_dev);
|
|
if (rc) {
|
|
dev_warn(&vscsi->dev, "establish_new_q: failed to enable interrupts, rc %ld\n",
|
|
rc);
|
|
return rc;
|
|
}
|
|
|
|
rc = ibmvscsis_check_init_msg(vscsi, &format);
|
|
if (rc) {
|
|
dev_err(&vscsi->dev, "establish_new_q: check_init_msg failed, rc %ld\n",
|
|
rc);
|
|
return rc;
|
|
}
|
|
|
|
if (format == UNUSED_FORMAT) {
|
|
rc = ibmvscsis_send_init_message(vscsi, INIT_MSG);
|
|
switch (rc) {
|
|
case H_SUCCESS:
|
|
case H_DROPPED:
|
|
case H_CLOSED:
|
|
rc = ADAPT_SUCCESS;
|
|
break;
|
|
|
|
case H_PARAMETER:
|
|
case H_HARDWARE:
|
|
break;
|
|
|
|
default:
|
|
vscsi->state = UNDEFINED;
|
|
rc = H_HARDWARE;
|
|
break;
|
|
}
|
|
} else if (format == INIT_MSG) {
|
|
rc = ibmvscsis_handle_init_msg(vscsi);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_reset_queue() - Reset CRQ Queue
|
|
* @vscsi: Pointer to our adapter structure
|
|
*
|
|
* This function calls h_free_q and then calls h_reg_q and does all
|
|
* of the bookkeeping to get us back to where we can communicate.
|
|
*
|
|
* Actually, we don't always call h_free_crq. A problem was discovered
|
|
* where one partition would close and reopen his queue, which would
|
|
* cause his partner to get a transport event, which would cause him to
|
|
* close and reopen his queue, which would cause the original partition
|
|
* to get a transport event, etc., etc. To prevent this, we don't
|
|
* actually close our queue if the client initiated the reset, (i.e.
|
|
* either we got a transport event or we have detected that the client's
|
|
* queue is gone)
|
|
*
|
|
* EXECUTION ENVIRONMENT:
|
|
* Process environment, called with interrupt lock held
|
|
*/
|
|
static void ibmvscsis_reset_queue(struct scsi_info *vscsi)
|
|
{
|
|
int bytes;
|
|
long rc = ADAPT_SUCCESS;
|
|
|
|
dev_dbg(&vscsi->dev, "reset_queue: flags 0x%x\n", vscsi->flags);
|
|
|
|
/* don't reset, the client did it for us */
|
|
if (vscsi->flags & (CLIENT_FAILED | TRANS_EVENT)) {
|
|
vscsi->flags &= PRESERVE_FLAG_FIELDS;
|
|
vscsi->rsp_q_timer.timer_pops = 0;
|
|
vscsi->debit = 0;
|
|
vscsi->credit = 0;
|
|
vscsi->state = WAIT_CONNECTION;
|
|
vio_enable_interrupts(vscsi->dma_dev);
|
|
} else {
|
|
rc = ibmvscsis_free_command_q(vscsi);
|
|
if (rc == ADAPT_SUCCESS) {
|
|
vscsi->state = WAIT_CONNECTION;
|
|
|
|
bytes = vscsi->cmd_q.size * PAGE_SIZE;
|
|
rc = h_reg_crq(vscsi->dds.unit_id,
|
|
vscsi->cmd_q.crq_token, bytes);
|
|
if (rc == H_CLOSED || rc == H_SUCCESS) {
|
|
rc = ibmvscsis_establish_new_q(vscsi);
|
|
}
|
|
|
|
if (rc != ADAPT_SUCCESS) {
|
|
dev_dbg(&vscsi->dev, "reset_queue: reg_crq rc %ld\n",
|
|
rc);
|
|
|
|
vscsi->state = ERR_DISCONNECTED;
|
|
vscsi->flags |= RESPONSE_Q_DOWN;
|
|
ibmvscsis_free_command_q(vscsi);
|
|
}
|
|
} else {
|
|
vscsi->state = ERR_DISCONNECTED;
|
|
vscsi->flags |= RESPONSE_Q_DOWN;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_free_cmd_resources() - Free command resources
|
|
* @vscsi: Pointer to our adapter structure
|
|
* @cmd: Command which is not longer in use
|
|
*
|
|
* Must be called with interrupt lock held.
|
|
*/
|
|
static void ibmvscsis_free_cmd_resources(struct scsi_info *vscsi,
|
|
struct ibmvscsis_cmd *cmd)
|
|
{
|
|
struct iu_entry *iue = cmd->iue;
|
|
|
|
switch (cmd->type) {
|
|
case TASK_MANAGEMENT:
|
|
case SCSI_CDB:
|
|
/*
|
|
* When the queue goes down this value is cleared, so it
|
|
* cannot be cleared in this general purpose function.
|
|
*/
|
|
if (vscsi->debit)
|
|
vscsi->debit -= 1;
|
|
break;
|
|
case ADAPTER_MAD:
|
|
vscsi->flags &= ~PROCESSING_MAD;
|
|
break;
|
|
case UNSET_TYPE:
|
|
break;
|
|
default:
|
|
dev_err(&vscsi->dev, "free_cmd_resources unknown type %d\n",
|
|
cmd->type);
|
|
break;
|
|
}
|
|
|
|
cmd->iue = NULL;
|
|
list_add_tail(&cmd->list, &vscsi->free_cmd);
|
|
srp_iu_put(iue);
|
|
|
|
if (list_empty(&vscsi->active_q) && list_empty(&vscsi->schedule_q) &&
|
|
list_empty(&vscsi->waiting_rsp) && (vscsi->flags & WAIT_FOR_IDLE)) {
|
|
vscsi->flags &= ~WAIT_FOR_IDLE;
|
|
complete(&vscsi->wait_idle);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_ready_for_suspend() - Helper function to call VIOCTL
|
|
* @vscsi: Pointer to our adapter structure
|
|
* @idle: Indicates whether we were called from adapter_idle. This
|
|
* is important to know if we need to do a disconnect, since if
|
|
* we're called from adapter_idle, we're still processing the
|
|
* current disconnect, so we can't just call post_disconnect.
|
|
*
|
|
* This function is called when the adapter is idle when phyp has sent
|
|
* us a Prepare for Suspend Transport Event.
|
|
*
|
|
* EXECUTION ENVIRONMENT:
|
|
* Process or interrupt environment called with interrupt lock held
|
|
*/
|
|
static long ibmvscsis_ready_for_suspend(struct scsi_info *vscsi, bool idle)
|
|
{
|
|
long rc = 0;
|
|
struct viosrp_crq *crq;
|
|
|
|
/* See if there is a Resume event in the queue */
|
|
crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index;
|
|
|
|
dev_dbg(&vscsi->dev, "ready_suspend: flags 0x%x, state 0x%hx crq_valid:%x\n",
|
|
vscsi->flags, vscsi->state, (int)crq->valid);
|
|
|
|
if (!(vscsi->flags & PREP_FOR_SUSPEND_ABORTED) && !(crq->valid)) {
|
|
rc = h_vioctl(vscsi->dds.unit_id, H_READY_FOR_SUSPEND, 0, 0, 0,
|
|
0, 0);
|
|
if (rc) {
|
|
dev_err(&vscsi->dev, "Ready for Suspend Vioctl failed: %ld\n",
|
|
rc);
|
|
rc = 0;
|
|
}
|
|
} else if (((vscsi->flags & PREP_FOR_SUSPEND_OVERWRITE) &&
|
|
(vscsi->flags & PREP_FOR_SUSPEND_ABORTED)) ||
|
|
((crq->valid) && ((crq->valid != VALID_TRANS_EVENT) ||
|
|
(crq->format != RESUME_FROM_SUSP)))) {
|
|
if (idle) {
|
|
vscsi->state = ERR_DISCONNECT_RECONNECT;
|
|
ibmvscsis_reset_queue(vscsi);
|
|
rc = -1;
|
|
} else if (vscsi->state == CONNECTED) {
|
|
ibmvscsis_post_disconnect(vscsi,
|
|
ERR_DISCONNECT_RECONNECT, 0);
|
|
}
|
|
|
|
vscsi->flags &= ~PREP_FOR_SUSPEND_OVERWRITE;
|
|
|
|
if ((crq->valid) && ((crq->valid != VALID_TRANS_EVENT) ||
|
|
(crq->format != RESUME_FROM_SUSP)))
|
|
dev_err(&vscsi->dev, "Invalid element in CRQ after Prepare for Suspend");
|
|
}
|
|
|
|
vscsi->flags &= ~(PREP_FOR_SUSPEND_PENDING | PREP_FOR_SUSPEND_ABORTED);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_trans_event() - Handle a Transport Event
|
|
* @vscsi: Pointer to our adapter structure
|
|
* @crq: Pointer to CRQ entry containing the Transport Event
|
|
*
|
|
* Do the logic to close the I_T nexus. This function may not
|
|
* behave to specification.
|
|
*
|
|
* EXECUTION ENVIRONMENT:
|
|
* Interrupt, interrupt lock held
|
|
*/
|
|
static long ibmvscsis_trans_event(struct scsi_info *vscsi,
|
|
struct viosrp_crq *crq)
|
|
{
|
|
long rc = ADAPT_SUCCESS;
|
|
|
|
dev_dbg(&vscsi->dev, "trans_event: format %d, flags 0x%x, state 0x%hx\n",
|
|
(int)crq->format, vscsi->flags, vscsi->state);
|
|
|
|
switch (crq->format) {
|
|
case MIGRATED:
|
|
case PARTNER_FAILED:
|
|
case PARTNER_DEREGISTER:
|
|
ibmvscsis_delete_client_info(vscsi, true);
|
|
if (crq->format == MIGRATED)
|
|
vscsi->flags &= ~PREP_FOR_SUSPEND_OVERWRITE;
|
|
switch (vscsi->state) {
|
|
case NO_QUEUE:
|
|
case ERR_DISCONNECTED:
|
|
case UNDEFINED:
|
|
break;
|
|
|
|
case UNCONFIGURING:
|
|
vscsi->flags |= (RESPONSE_Q_DOWN | TRANS_EVENT);
|
|
break;
|
|
|
|
case WAIT_ENABLED:
|
|
break;
|
|
|
|
case WAIT_CONNECTION:
|
|
break;
|
|
|
|
case CONNECTED:
|
|
ibmvscsis_post_disconnect(vscsi, WAIT_IDLE,
|
|
(RESPONSE_Q_DOWN |
|
|
TRANS_EVENT));
|
|
break;
|
|
|
|
case SRP_PROCESSING:
|
|
if ((vscsi->debit > 0) ||
|
|
!list_empty(&vscsi->schedule_q) ||
|
|
!list_empty(&vscsi->waiting_rsp) ||
|
|
!list_empty(&vscsi->active_q)) {
|
|
dev_dbg(&vscsi->dev, "debit %d, sched %d, wait %d, active %d\n",
|
|
vscsi->debit,
|
|
(int)list_empty(&vscsi->schedule_q),
|
|
(int)list_empty(&vscsi->waiting_rsp),
|
|
(int)list_empty(&vscsi->active_q));
|
|
dev_warn(&vscsi->dev, "connection lost with outstanding work\n");
|
|
} else {
|
|
dev_dbg(&vscsi->dev, "trans_event: SRP Processing, but no outstanding work\n");
|
|
}
|
|
|
|
ibmvscsis_post_disconnect(vscsi, WAIT_IDLE,
|
|
(RESPONSE_Q_DOWN |
|
|
TRANS_EVENT));
|
|
break;
|
|
|
|
case ERR_DISCONNECT:
|
|
case ERR_DISCONNECT_RECONNECT:
|
|
case WAIT_IDLE:
|
|
vscsi->flags |= (RESPONSE_Q_DOWN | TRANS_EVENT);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case PREPARE_FOR_SUSPEND:
|
|
dev_dbg(&vscsi->dev, "Prep for Suspend, crq status = 0x%x\n",
|
|
(int)crq->status);
|
|
switch (vscsi->state) {
|
|
case ERR_DISCONNECTED:
|
|
case WAIT_CONNECTION:
|
|
case CONNECTED:
|
|
ibmvscsis_ready_for_suspend(vscsi, false);
|
|
break;
|
|
case SRP_PROCESSING:
|
|
vscsi->resume_state = vscsi->state;
|
|
vscsi->flags |= PREP_FOR_SUSPEND_PENDING;
|
|
if (crq->status == CRQ_ENTRY_OVERWRITTEN)
|
|
vscsi->flags |= PREP_FOR_SUSPEND_OVERWRITE;
|
|
ibmvscsis_post_disconnect(vscsi, WAIT_IDLE, 0);
|
|
break;
|
|
case NO_QUEUE:
|
|
case UNDEFINED:
|
|
case UNCONFIGURING:
|
|
case WAIT_ENABLED:
|
|
case ERR_DISCONNECT:
|
|
case ERR_DISCONNECT_RECONNECT:
|
|
case WAIT_IDLE:
|
|
dev_err(&vscsi->dev, "Invalid state for Prepare for Suspend Trans Event: 0x%x\n",
|
|
vscsi->state);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case RESUME_FROM_SUSP:
|
|
dev_dbg(&vscsi->dev, "Resume from Suspend, crq status = 0x%x\n",
|
|
(int)crq->status);
|
|
if (vscsi->flags & PREP_FOR_SUSPEND_PENDING) {
|
|
vscsi->flags |= PREP_FOR_SUSPEND_ABORTED;
|
|
} else {
|
|
if ((crq->status == CRQ_ENTRY_OVERWRITTEN) ||
|
|
(vscsi->flags & PREP_FOR_SUSPEND_OVERWRITE)) {
|
|
ibmvscsis_post_disconnect(vscsi,
|
|
ERR_DISCONNECT_RECONNECT,
|
|
0);
|
|
vscsi->flags &= ~PREP_FOR_SUSPEND_OVERWRITE;
|
|
}
|
|
}
|
|
break;
|
|
|
|
default:
|
|
rc = ERROR;
|
|
dev_err(&vscsi->dev, "trans_event: invalid format %d\n",
|
|
(uint)crq->format);
|
|
ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT,
|
|
RESPONSE_Q_DOWN);
|
|
break;
|
|
}
|
|
|
|
rc = vscsi->flags & SCHEDULE_DISCONNECT;
|
|
|
|
dev_dbg(&vscsi->dev, "Leaving trans_event: flags 0x%x, state 0x%hx, rc %ld\n",
|
|
vscsi->flags, vscsi->state, rc);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_poll_cmd_q() - Poll Command Queue
|
|
* @vscsi: Pointer to our adapter structure
|
|
*
|
|
* Called to handle command elements that may have arrived while
|
|
* interrupts were disabled.
|
|
*
|
|
* EXECUTION ENVIRONMENT:
|
|
* intr_lock must be held
|
|
*/
|
|
static void ibmvscsis_poll_cmd_q(struct scsi_info *vscsi)
|
|
{
|
|
struct viosrp_crq *crq;
|
|
long rc;
|
|
bool ack = true;
|
|
volatile u8 valid;
|
|
|
|
dev_dbg(&vscsi->dev, "poll_cmd_q: flags 0x%x, state 0x%hx, q index %ud\n",
|
|
vscsi->flags, vscsi->state, vscsi->cmd_q.index);
|
|
|
|
rc = vscsi->flags & SCHEDULE_DISCONNECT;
|
|
crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index;
|
|
valid = crq->valid;
|
|
dma_rmb();
|
|
|
|
while (valid) {
|
|
poll_work:
|
|
vscsi->cmd_q.index =
|
|
(vscsi->cmd_q.index + 1) & vscsi->cmd_q.mask;
|
|
|
|
if (!rc) {
|
|
rc = ibmvscsis_parse_command(vscsi, crq);
|
|
} else {
|
|
if ((uint)crq->valid == VALID_TRANS_EVENT) {
|
|
/*
|
|
* must service the transport layer events even
|
|
* in an error state, dont break out until all
|
|
* the consecutive transport events have been
|
|
* processed
|
|
*/
|
|
rc = ibmvscsis_trans_event(vscsi, crq);
|
|
} else if (vscsi->flags & TRANS_EVENT) {
|
|
/*
|
|
* if a tranport event has occurred leave
|
|
* everything but transport events on the queue
|
|
*/
|
|
dev_dbg(&vscsi->dev, "poll_cmd_q, ignoring\n");
|
|
|
|
/*
|
|
* need to decrement the queue index so we can
|
|
* look at the elment again
|
|
*/
|
|
if (vscsi->cmd_q.index)
|
|
vscsi->cmd_q.index -= 1;
|
|
else
|
|
/*
|
|
* index is at 0 it just wrapped.
|
|
* have it index last element in q
|
|
*/
|
|
vscsi->cmd_q.index = vscsi->cmd_q.mask;
|
|
break;
|
|
}
|
|
}
|
|
|
|
crq->valid = INVALIDATE_CMD_RESP_EL;
|
|
|
|
crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index;
|
|
valid = crq->valid;
|
|
dma_rmb();
|
|
}
|
|
|
|
if (!rc) {
|
|
if (ack) {
|
|
vio_enable_interrupts(vscsi->dma_dev);
|
|
ack = false;
|
|
dev_dbg(&vscsi->dev, "poll_cmd_q, reenabling interrupts\n");
|
|
}
|
|
valid = crq->valid;
|
|
dma_rmb();
|
|
if (valid)
|
|
goto poll_work;
|
|
}
|
|
|
|
dev_dbg(&vscsi->dev, "Leaving poll_cmd_q: rc %ld\n", rc);
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_free_cmd_qs() - Free elements in queue
|
|
* @vscsi: Pointer to our adapter structure
|
|
*
|
|
* Free all of the elements on all queues that are waiting for
|
|
* whatever reason.
|
|
*
|
|
* PRECONDITION:
|
|
* Called with interrupt lock held
|
|
*/
|
|
static void ibmvscsis_free_cmd_qs(struct scsi_info *vscsi)
|
|
{
|
|
struct ibmvscsis_cmd *cmd, *nxt;
|
|
|
|
dev_dbg(&vscsi->dev, "free_cmd_qs: waiting_rsp empty %d, timer starter %d\n",
|
|
(int)list_empty(&vscsi->waiting_rsp),
|
|
vscsi->rsp_q_timer.started);
|
|
|
|
list_for_each_entry_safe(cmd, nxt, &vscsi->waiting_rsp, list) {
|
|
list_del(&cmd->list);
|
|
ibmvscsis_free_cmd_resources(vscsi, cmd);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_get_free_cmd() - Get free command from list
|
|
* @vscsi: Pointer to our adapter structure
|
|
*
|
|
* Must be called with interrupt lock held.
|
|
*/
|
|
static struct ibmvscsis_cmd *ibmvscsis_get_free_cmd(struct scsi_info *vscsi)
|
|
{
|
|
struct ibmvscsis_cmd *cmd = NULL;
|
|
struct iu_entry *iue;
|
|
|
|
iue = srp_iu_get(&vscsi->target);
|
|
if (iue) {
|
|
cmd = list_first_entry_or_null(&vscsi->free_cmd,
|
|
struct ibmvscsis_cmd, list);
|
|
if (cmd) {
|
|
if (cmd->abort_cmd)
|
|
cmd->abort_cmd = NULL;
|
|
cmd->flags &= ~(DELAY_SEND);
|
|
list_del(&cmd->list);
|
|
cmd->iue = iue;
|
|
cmd->type = UNSET_TYPE;
|
|
memset(&cmd->se_cmd, 0, sizeof(cmd->se_cmd));
|
|
} else {
|
|
srp_iu_put(iue);
|
|
}
|
|
}
|
|
|
|
return cmd;
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_adapter_idle() - Helper function to handle idle adapter
|
|
* @vscsi: Pointer to our adapter structure
|
|
*
|
|
* This function is called when the adapter is idle when the driver
|
|
* is attempting to clear an error condition.
|
|
* The adapter is considered busy if any of its cmd queues
|
|
* are non-empty. This function can be invoked
|
|
* from the off level disconnect function.
|
|
*
|
|
* EXECUTION ENVIRONMENT:
|
|
* Process environment called with interrupt lock held
|
|
*/
|
|
static void ibmvscsis_adapter_idle(struct scsi_info *vscsi)
|
|
{
|
|
int free_qs = false;
|
|
long rc = 0;
|
|
|
|
dev_dbg(&vscsi->dev, "adapter_idle: flags 0x%x, state 0x%hx\n",
|
|
vscsi->flags, vscsi->state);
|
|
|
|
/* Only need to free qs if we're disconnecting from client */
|
|
if (vscsi->state != WAIT_CONNECTION || vscsi->flags & TRANS_EVENT)
|
|
free_qs = true;
|
|
|
|
switch (vscsi->state) {
|
|
case UNCONFIGURING:
|
|
ibmvscsis_free_command_q(vscsi);
|
|
dma_rmb();
|
|
isync();
|
|
if (vscsi->flags & CFG_SLEEPING) {
|
|
vscsi->flags &= ~CFG_SLEEPING;
|
|
complete(&vscsi->unconfig);
|
|
}
|
|
break;
|
|
case ERR_DISCONNECT_RECONNECT:
|
|
ibmvscsis_reset_queue(vscsi);
|
|
dev_dbg(&vscsi->dev, "adapter_idle, disc_rec: flags 0x%x\n",
|
|
vscsi->flags);
|
|
break;
|
|
|
|
case ERR_DISCONNECT:
|
|
ibmvscsis_free_command_q(vscsi);
|
|
vscsi->flags &= ~(SCHEDULE_DISCONNECT | DISCONNECT_SCHEDULED);
|
|
vscsi->flags |= RESPONSE_Q_DOWN;
|
|
if (vscsi->tport.enabled)
|
|
vscsi->state = ERR_DISCONNECTED;
|
|
else
|
|
vscsi->state = WAIT_ENABLED;
|
|
dev_dbg(&vscsi->dev, "adapter_idle, disc: flags 0x%x, state 0x%hx\n",
|
|
vscsi->flags, vscsi->state);
|
|
break;
|
|
|
|
case WAIT_IDLE:
|
|
vscsi->rsp_q_timer.timer_pops = 0;
|
|
vscsi->debit = 0;
|
|
vscsi->credit = 0;
|
|
if (vscsi->flags & PREP_FOR_SUSPEND_PENDING) {
|
|
vscsi->state = vscsi->resume_state;
|
|
vscsi->resume_state = 0;
|
|
rc = ibmvscsis_ready_for_suspend(vscsi, true);
|
|
vscsi->flags &= ~DISCONNECT_SCHEDULED;
|
|
if (rc)
|
|
break;
|
|
} else if (vscsi->flags & TRANS_EVENT) {
|
|
vscsi->state = WAIT_CONNECTION;
|
|
vscsi->flags &= PRESERVE_FLAG_FIELDS;
|
|
} else {
|
|
vscsi->state = CONNECTED;
|
|
vscsi->flags &= ~DISCONNECT_SCHEDULED;
|
|
}
|
|
|
|
dev_dbg(&vscsi->dev, "adapter_idle, wait: flags 0x%x, state 0x%hx\n",
|
|
vscsi->flags, vscsi->state);
|
|
ibmvscsis_poll_cmd_q(vscsi);
|
|
break;
|
|
|
|
case ERR_DISCONNECTED:
|
|
vscsi->flags &= ~DISCONNECT_SCHEDULED;
|
|
dev_dbg(&vscsi->dev, "adapter_idle, disconnected: flags 0x%x, state 0x%hx\n",
|
|
vscsi->flags, vscsi->state);
|
|
break;
|
|
|
|
default:
|
|
dev_err(&vscsi->dev, "adapter_idle: in invalid state %d\n",
|
|
vscsi->state);
|
|
break;
|
|
}
|
|
|
|
if (free_qs)
|
|
ibmvscsis_free_cmd_qs(vscsi);
|
|
|
|
/*
|
|
* There is a timing window where we could lose a disconnect request.
|
|
* The known path to this window occurs during the DISCONNECT_RECONNECT
|
|
* case above: reset_queue calls free_command_q, which will release the
|
|
* interrupt lock. During that time, a new post_disconnect call can be
|
|
* made with a "more severe" state (DISCONNECT or UNCONFIGURING).
|
|
* Because the DISCONNECT_SCHEDULED flag is already set, post_disconnect
|
|
* will only set the new_state. Now free_command_q reacquires the intr
|
|
* lock and clears the DISCONNECT_SCHEDULED flag (using PRESERVE_FLAG_
|
|
* FIELDS), and the disconnect is lost. This is particularly bad when
|
|
* the new disconnect was for UNCONFIGURING, since the unconfigure hangs
|
|
* forever.
|
|
* Fix is that free command queue sets acr state and acr flags if there
|
|
* is a change under the lock
|
|
* note free command queue writes to this state it clears it
|
|
* before releasing the lock, different drivers call the free command
|
|
* queue different times so dont initialize above
|
|
*/
|
|
if (vscsi->phyp_acr_state != 0) {
|
|
/*
|
|
* set any bits in flags that may have been cleared by
|
|
* a call to free command queue in switch statement
|
|
* or reset queue
|
|
*/
|
|
vscsi->flags |= vscsi->phyp_acr_flags;
|
|
ibmvscsis_post_disconnect(vscsi, vscsi->phyp_acr_state, 0);
|
|
vscsi->phyp_acr_state = 0;
|
|
vscsi->phyp_acr_flags = 0;
|
|
|
|
dev_dbg(&vscsi->dev, "adapter_idle: flags 0x%x, state 0x%hx, acr_flags 0x%x, acr_state 0x%hx\n",
|
|
vscsi->flags, vscsi->state, vscsi->phyp_acr_flags,
|
|
vscsi->phyp_acr_state);
|
|
}
|
|
|
|
dev_dbg(&vscsi->dev, "Leaving adapter_idle: flags 0x%x, state 0x%hx, new_state 0x%x\n",
|
|
vscsi->flags, vscsi->state, vscsi->new_state);
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_copy_crq_packet() - Copy CRQ Packet
|
|
* @vscsi: Pointer to our adapter structure
|
|
* @cmd: Pointer to command element to use to process the request
|
|
* @crq: Pointer to CRQ entry containing the request
|
|
*
|
|
* Copy the srp information unit from the hosted
|
|
* partition using remote dma
|
|
*
|
|
* EXECUTION ENVIRONMENT:
|
|
* Interrupt, interrupt lock held
|
|
*/
|
|
static long ibmvscsis_copy_crq_packet(struct scsi_info *vscsi,
|
|
struct ibmvscsis_cmd *cmd,
|
|
struct viosrp_crq *crq)
|
|
{
|
|
struct iu_entry *iue = cmd->iue;
|
|
long rc = 0;
|
|
u16 len;
|
|
|
|
len = be16_to_cpu(crq->IU_length);
|
|
if ((len > SRP_MAX_IU_LEN) || (len == 0)) {
|
|
dev_err(&vscsi->dev, "copy_crq: Invalid len %d passed", len);
|
|
ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
|
|
return SRP_VIOLATION;
|
|
}
|
|
|
|
rc = h_copy_rdma(len, vscsi->dds.window[REMOTE].liobn,
|
|
be64_to_cpu(crq->IU_data_ptr),
|
|
vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma);
|
|
|
|
switch (rc) {
|
|
case H_SUCCESS:
|
|
cmd->init_time = mftb();
|
|
iue->remote_token = crq->IU_data_ptr;
|
|
iue->iu_len = len;
|
|
dev_dbg(&vscsi->dev, "copy_crq: ioba 0x%llx, init_time 0x%llx\n",
|
|
be64_to_cpu(crq->IU_data_ptr), cmd->init_time);
|
|
break;
|
|
case H_PERMISSION:
|
|
if (connection_broken(vscsi))
|
|
ibmvscsis_post_disconnect(vscsi,
|
|
ERR_DISCONNECT_RECONNECT,
|
|
(RESPONSE_Q_DOWN |
|
|
CLIENT_FAILED));
|
|
else
|
|
ibmvscsis_post_disconnect(vscsi,
|
|
ERR_DISCONNECT_RECONNECT, 0);
|
|
|
|
dev_err(&vscsi->dev, "copy_crq: h_copy_rdma failed, rc %ld\n",
|
|
rc);
|
|
break;
|
|
case H_DEST_PARM:
|
|
case H_SOURCE_PARM:
|
|
default:
|
|
dev_err(&vscsi->dev, "copy_crq: h_copy_rdma failed, rc %ld\n",
|
|
rc);
|
|
ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
|
|
break;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_adapter_info - Service an Adapter Info MAnagement Data gram
|
|
* @vscsi: Pointer to our adapter structure
|
|
* @iue: Information Unit containing the Adapter Info MAD request
|
|
*
|
|
* EXECUTION ENVIRONMENT:
|
|
* Interrupt adapter lock is held
|
|
*/
|
|
static long ibmvscsis_adapter_info(struct scsi_info *vscsi,
|
|
struct iu_entry *iue)
|
|
{
|
|
struct viosrp_adapter_info *mad = &vio_iu(iue)->mad.adapter_info;
|
|
struct mad_adapter_info_data *info;
|
|
uint flag_bits = 0;
|
|
dma_addr_t token;
|
|
long rc;
|
|
|
|
mad->common.status = cpu_to_be16(VIOSRP_MAD_SUCCESS);
|
|
|
|
if (be16_to_cpu(mad->common.length) > sizeof(*info)) {
|
|
mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED);
|
|
return 0;
|
|
}
|
|
|
|
info = dma_alloc_coherent(&vscsi->dma_dev->dev, sizeof(*info), &token,
|
|
GFP_ATOMIC);
|
|
if (!info) {
|
|
dev_err(&vscsi->dev, "bad dma_alloc_coherent %p\n",
|
|
iue->target);
|
|
mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED);
|
|
return 0;
|
|
}
|
|
|
|
/* Get remote info */
|
|
rc = h_copy_rdma(be16_to_cpu(mad->common.length),
|
|
vscsi->dds.window[REMOTE].liobn,
|
|
be64_to_cpu(mad->buffer),
|
|
vscsi->dds.window[LOCAL].liobn, token);
|
|
|
|
if (rc != H_SUCCESS) {
|
|
if (rc == H_PERMISSION) {
|
|
if (connection_broken(vscsi))
|
|
flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED);
|
|
}
|
|
dev_warn(&vscsi->dev, "adapter_info: h_copy_rdma from client failed, rc %ld\n",
|
|
rc);
|
|
dev_dbg(&vscsi->dev, "adapter_info: ioba 0x%llx, flags 0x%x, flag_bits 0x%x\n",
|
|
be64_to_cpu(mad->buffer), vscsi->flags, flag_bits);
|
|
ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT,
|
|
flag_bits);
|
|
goto free_dma;
|
|
}
|
|
|
|
/*
|
|
* Copy client info, but ignore partition number, which we
|
|
* already got from phyp - unless we failed to get it from
|
|
* phyp (e.g. if we're running on a p5 system).
|
|
*/
|
|
if (vscsi->client_data.partition_number == 0)
|
|
vscsi->client_data.partition_number =
|
|
be32_to_cpu(info->partition_number);
|
|
strncpy(vscsi->client_data.srp_version, info->srp_version,
|
|
sizeof(vscsi->client_data.srp_version));
|
|
strncpy(vscsi->client_data.partition_name, info->partition_name,
|
|
sizeof(vscsi->client_data.partition_name));
|
|
vscsi->client_data.mad_version = be32_to_cpu(info->mad_version);
|
|
vscsi->client_data.os_type = be32_to_cpu(info->os_type);
|
|
|
|
/* Copy our info */
|
|
strncpy(info->srp_version, SRP_VERSION,
|
|
sizeof(info->srp_version));
|
|
strncpy(info->partition_name, vscsi->dds.partition_name,
|
|
sizeof(info->partition_name));
|
|
info->partition_number = cpu_to_be32(vscsi->dds.partition_num);
|
|
info->mad_version = cpu_to_be32(MAD_VERSION_1);
|
|
info->os_type = cpu_to_be32(LINUX);
|
|
memset(&info->port_max_txu[0], 0, sizeof(info->port_max_txu));
|
|
info->port_max_txu[0] = cpu_to_be32(MAX_TXU);
|
|
|
|
dma_wmb();
|
|
rc = h_copy_rdma(sizeof(*info), vscsi->dds.window[LOCAL].liobn,
|
|
token, vscsi->dds.window[REMOTE].liobn,
|
|
be64_to_cpu(mad->buffer));
|
|
switch (rc) {
|
|
case H_SUCCESS:
|
|
break;
|
|
|
|
case H_SOURCE_PARM:
|
|
case H_DEST_PARM:
|
|
case H_PERMISSION:
|
|
if (connection_broken(vscsi))
|
|
flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED);
|
|
/* Fall through */
|
|
default:
|
|
dev_err(&vscsi->dev, "adapter_info: h_copy_rdma to client failed, rc %ld\n",
|
|
rc);
|
|
ibmvscsis_post_disconnect(vscsi,
|
|
ERR_DISCONNECT_RECONNECT,
|
|
flag_bits);
|
|
break;
|
|
}
|
|
|
|
free_dma:
|
|
dma_free_coherent(&vscsi->dma_dev->dev, sizeof(*info), info, token);
|
|
dev_dbg(&vscsi->dev, "Leaving adapter_info, rc %ld\n", rc);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_cap_mad() - Service a Capabilities MAnagement Data gram
|
|
* @vscsi: Pointer to our adapter structure
|
|
* @iue: Information Unit containing the Capabilities MAD request
|
|
*
|
|
* NOTE: if you return an error from this routine you must be
|
|
* disconnecting or you will cause a hang
|
|
*
|
|
* EXECUTION ENVIRONMENT:
|
|
* Interrupt called with adapter lock held
|
|
*/
|
|
static int ibmvscsis_cap_mad(struct scsi_info *vscsi, struct iu_entry *iue)
|
|
{
|
|
struct viosrp_capabilities *mad = &vio_iu(iue)->mad.capabilities;
|
|
struct capabilities *cap;
|
|
struct mad_capability_common *common;
|
|
dma_addr_t token;
|
|
u16 olen, len, status, min_len, cap_len;
|
|
u32 flag;
|
|
uint flag_bits = 0;
|
|
long rc = 0;
|
|
|
|
olen = be16_to_cpu(mad->common.length);
|
|
/*
|
|
* struct capabilities hardcodes a couple capabilities after the
|
|
* header, but the capabilities can actually be in any order.
|
|
*/
|
|
min_len = offsetof(struct capabilities, migration);
|
|
if ((olen < min_len) || (olen > PAGE_SIZE)) {
|
|
dev_warn(&vscsi->dev, "cap_mad: invalid len %d\n", olen);
|
|
mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED);
|
|
return 0;
|
|
}
|
|
|
|
cap = dma_alloc_coherent(&vscsi->dma_dev->dev, olen, &token,
|
|
GFP_ATOMIC);
|
|
if (!cap) {
|
|
dev_err(&vscsi->dev, "bad dma_alloc_coherent %p\n",
|
|
iue->target);
|
|
mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED);
|
|
return 0;
|
|
}
|
|
rc = h_copy_rdma(olen, vscsi->dds.window[REMOTE].liobn,
|
|
be64_to_cpu(mad->buffer),
|
|
vscsi->dds.window[LOCAL].liobn, token);
|
|
if (rc == H_SUCCESS) {
|
|
strncpy(cap->name, dev_name(&vscsi->dma_dev->dev),
|
|
SRP_MAX_LOC_LEN);
|
|
|
|
len = olen - min_len;
|
|
status = VIOSRP_MAD_SUCCESS;
|
|
common = (struct mad_capability_common *)&cap->migration;
|
|
|
|
while ((len > 0) && (status == VIOSRP_MAD_SUCCESS) && !rc) {
|
|
dev_dbg(&vscsi->dev, "cap_mad: len left %hd, cap type %d, cap len %hd\n",
|
|
len, be32_to_cpu(common->cap_type),
|
|
be16_to_cpu(common->length));
|
|
|
|
cap_len = be16_to_cpu(common->length);
|
|
if (cap_len > len) {
|
|
dev_err(&vscsi->dev, "cap_mad: cap len mismatch with total len\n");
|
|
status = VIOSRP_MAD_FAILED;
|
|
break;
|
|
}
|
|
|
|
if (cap_len == 0) {
|
|
dev_err(&vscsi->dev, "cap_mad: cap len is 0\n");
|
|
status = VIOSRP_MAD_FAILED;
|
|
break;
|
|
}
|
|
|
|
switch (common->cap_type) {
|
|
default:
|
|
dev_dbg(&vscsi->dev, "cap_mad: unsupported capability\n");
|
|
common->server_support = 0;
|
|
flag = cpu_to_be32((u32)CAP_LIST_SUPPORTED);
|
|
cap->flags &= ~flag;
|
|
break;
|
|
}
|
|
|
|
len = len - cap_len;
|
|
common = (struct mad_capability_common *)
|
|
((char *)common + cap_len);
|
|
}
|
|
|
|
mad->common.status = cpu_to_be16(status);
|
|
|
|
dma_wmb();
|
|
rc = h_copy_rdma(olen, vscsi->dds.window[LOCAL].liobn, token,
|
|
vscsi->dds.window[REMOTE].liobn,
|
|
be64_to_cpu(mad->buffer));
|
|
|
|
if (rc != H_SUCCESS) {
|
|
dev_dbg(&vscsi->dev, "cap_mad: failed to copy to client, rc %ld\n",
|
|
rc);
|
|
|
|
if (rc == H_PERMISSION) {
|
|
if (connection_broken(vscsi))
|
|
flag_bits = (RESPONSE_Q_DOWN |
|
|
CLIENT_FAILED);
|
|
}
|
|
|
|
dev_warn(&vscsi->dev, "cap_mad: error copying data to client, rc %ld\n",
|
|
rc);
|
|
ibmvscsis_post_disconnect(vscsi,
|
|
ERR_DISCONNECT_RECONNECT,
|
|
flag_bits);
|
|
}
|
|
}
|
|
|
|
dma_free_coherent(&vscsi->dma_dev->dev, olen, cap, token);
|
|
|
|
dev_dbg(&vscsi->dev, "Leaving cap_mad, rc %ld, client_cap 0x%x\n",
|
|
rc, vscsi->client_cap);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_process_mad() - Service a MAnagement Data gram
|
|
* @vscsi: Pointer to our adapter structure
|
|
* @iue: Information Unit containing the MAD request
|
|
*
|
|
* Must be called with interrupt lock held.
|
|
*/
|
|
static long ibmvscsis_process_mad(struct scsi_info *vscsi, struct iu_entry *iue)
|
|
{
|
|
struct mad_common *mad = (struct mad_common *)&vio_iu(iue)->mad;
|
|
struct viosrp_empty_iu *empty;
|
|
long rc = ADAPT_SUCCESS;
|
|
|
|
switch (be32_to_cpu(mad->type)) {
|
|
case VIOSRP_EMPTY_IU_TYPE:
|
|
empty = &vio_iu(iue)->mad.empty_iu;
|
|
vscsi->empty_iu_id = be64_to_cpu(empty->buffer);
|
|
vscsi->empty_iu_tag = be64_to_cpu(empty->common.tag);
|
|
mad->status = cpu_to_be16(VIOSRP_MAD_SUCCESS);
|
|
break;
|
|
case VIOSRP_ADAPTER_INFO_TYPE:
|
|
rc = ibmvscsis_adapter_info(vscsi, iue);
|
|
break;
|
|
case VIOSRP_CAPABILITIES_TYPE:
|
|
rc = ibmvscsis_cap_mad(vscsi, iue);
|
|
break;
|
|
case VIOSRP_ENABLE_FAST_FAIL:
|
|
if (vscsi->state == CONNECTED) {
|
|
vscsi->fast_fail = true;
|
|
mad->status = cpu_to_be16(VIOSRP_MAD_SUCCESS);
|
|
} else {
|
|
dev_warn(&vscsi->dev, "fast fail mad sent after login\n");
|
|
mad->status = cpu_to_be16(VIOSRP_MAD_FAILED);
|
|
}
|
|
break;
|
|
default:
|
|
mad->status = cpu_to_be16(VIOSRP_MAD_NOT_SUPPORTED);
|
|
break;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* srp_snd_msg_failed() - Handle an error when sending a response
|
|
* @vscsi: Pointer to our adapter structure
|
|
* @rc: The return code from the h_send_crq command
|
|
*
|
|
* Must be called with interrupt lock held.
|
|
*/
|
|
static void srp_snd_msg_failed(struct scsi_info *vscsi, long rc)
|
|
{
|
|
ktime_t kt;
|
|
|
|
if (rc != H_DROPPED) {
|
|
ibmvscsis_free_cmd_qs(vscsi);
|
|
|
|
if (rc == H_CLOSED)
|
|
vscsi->flags |= CLIENT_FAILED;
|
|
|
|
/* don't flag the same problem multiple times */
|
|
if (!(vscsi->flags & RESPONSE_Q_DOWN)) {
|
|
vscsi->flags |= RESPONSE_Q_DOWN;
|
|
if (!(vscsi->state & (ERR_DISCONNECT |
|
|
ERR_DISCONNECT_RECONNECT |
|
|
ERR_DISCONNECTED | UNDEFINED))) {
|
|
dev_err(&vscsi->dev, "snd_msg_failed: setting RESPONSE_Q_DOWN, state 0x%hx, flags 0x%x, rc %ld\n",
|
|
vscsi->state, vscsi->flags, rc);
|
|
}
|
|
ibmvscsis_post_disconnect(vscsi,
|
|
ERR_DISCONNECT_RECONNECT, 0);
|
|
}
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* The response queue is full.
|
|
* If the server is processing SRP requests, i.e.
|
|
* the client has successfully done an
|
|
* SRP_LOGIN, then it will wait forever for room in
|
|
* the queue. However if the system admin
|
|
* is attempting to unconfigure the server then one
|
|
* or more children will be in a state where
|
|
* they are being removed. So if there is even one
|
|
* child being removed then the driver assumes
|
|
* the system admin is attempting to break the
|
|
* connection with the client and MAX_TIMER_POPS
|
|
* is honored.
|
|
*/
|
|
if ((vscsi->rsp_q_timer.timer_pops < MAX_TIMER_POPS) ||
|
|
(vscsi->state == SRP_PROCESSING)) {
|
|
dev_dbg(&vscsi->dev, "snd_msg_failed: response queue full, flags 0x%x, timer started %d, pops %d\n",
|
|
vscsi->flags, (int)vscsi->rsp_q_timer.started,
|
|
vscsi->rsp_q_timer.timer_pops);
|
|
|
|
/*
|
|
* Check if the timer is running; if it
|
|
* is not then start it up.
|
|
*/
|
|
if (!vscsi->rsp_q_timer.started) {
|
|
if (vscsi->rsp_q_timer.timer_pops <
|
|
MAX_TIMER_POPS) {
|
|
kt = WAIT_NANO_SECONDS;
|
|
} else {
|
|
/*
|
|
* slide the timeslice if the maximum
|
|
* timer pops have already happened
|
|
*/
|
|
kt = ktime_set(WAIT_SECONDS, 0);
|
|
}
|
|
|
|
vscsi->rsp_q_timer.started = true;
|
|
hrtimer_start(&vscsi->rsp_q_timer.timer, kt,
|
|
HRTIMER_MODE_REL);
|
|
}
|
|
} else {
|
|
/*
|
|
* TBD: Do we need to worry about this? Need to get
|
|
* remove working.
|
|
*/
|
|
/*
|
|
* waited a long time and it appears the system admin
|
|
* is bring this driver down
|
|
*/
|
|
vscsi->flags |= RESPONSE_Q_DOWN;
|
|
ibmvscsis_free_cmd_qs(vscsi);
|
|
/*
|
|
* if the driver is already attempting to disconnect
|
|
* from the client and has already logged an error
|
|
* trace this event but don't put it in the error log
|
|
*/
|
|
if (!(vscsi->state & (ERR_DISCONNECT |
|
|
ERR_DISCONNECT_RECONNECT |
|
|
ERR_DISCONNECTED | UNDEFINED))) {
|
|
dev_err(&vscsi->dev, "client crq full too long\n");
|
|
ibmvscsis_post_disconnect(vscsi,
|
|
ERR_DISCONNECT_RECONNECT,
|
|
0);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_send_messages() - Send a Response
|
|
* @vscsi: Pointer to our adapter structure
|
|
*
|
|
* Send a response, first checking the waiting queue. Responses are
|
|
* sent in order they are received. If the response cannot be sent,
|
|
* because the client queue is full, it stays on the waiting queue.
|
|
*
|
|
* PRECONDITION:
|
|
* Called with interrupt lock held
|
|
*/
|
|
static void ibmvscsis_send_messages(struct scsi_info *vscsi)
|
|
{
|
|
u64 msg_hi = 0;
|
|
/* note do not attempt to access the IU_data_ptr with this pointer
|
|
* it is not valid
|
|
*/
|
|
struct viosrp_crq *crq = (struct viosrp_crq *)&msg_hi;
|
|
struct ibmvscsis_cmd *cmd, *nxt;
|
|
long rc = ADAPT_SUCCESS;
|
|
bool retry = false;
|
|
|
|
if (!(vscsi->flags & RESPONSE_Q_DOWN)) {
|
|
do {
|
|
retry = false;
|
|
list_for_each_entry_safe(cmd, nxt, &vscsi->waiting_rsp,
|
|
list) {
|
|
/*
|
|
* Check to make sure abort cmd gets processed
|
|
* prior to the abort tmr cmd
|
|
*/
|
|
if (cmd->flags & DELAY_SEND)
|
|
continue;
|
|
|
|
if (cmd->abort_cmd) {
|
|
retry = true;
|
|
cmd->abort_cmd->flags &= ~(DELAY_SEND);
|
|
cmd->abort_cmd = NULL;
|
|
}
|
|
|
|
/*
|
|
* If CMD_T_ABORTED w/o CMD_T_TAS scenarios and
|
|
* the case where LIO issued a
|
|
* ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST
|
|
* case then we dont send a response, since it
|
|
* was already done.
|
|
*/
|
|
if (cmd->se_cmd.transport_state & CMD_T_ABORTED &&
|
|
!(cmd->se_cmd.transport_state & CMD_T_TAS)) {
|
|
list_del(&cmd->list);
|
|
ibmvscsis_free_cmd_resources(vscsi,
|
|
cmd);
|
|
/*
|
|
* With a successfully aborted op
|
|
* through LIO we want to increment the
|
|
* the vscsi credit so that when we dont
|
|
* send a rsp to the original scsi abort
|
|
* op (h_send_crq), but the tm rsp to
|
|
* the abort is sent, the credit is
|
|
* correctly sent with the abort tm rsp.
|
|
* We would need 1 for the abort tm rsp
|
|
* and 1 credit for the aborted scsi op.
|
|
* Thus we need to increment here.
|
|
* Also we want to increment the credit
|
|
* here because we want to make sure
|
|
* cmd is actually released first
|
|
* otherwise the client will think it
|
|
* it can send a new cmd, and we could
|
|
* find ourselves short of cmd elements.
|
|
*/
|
|
vscsi->credit += 1;
|
|
} else {
|
|
crq->valid = VALID_CMD_RESP_EL;
|
|
crq->format = cmd->rsp.format;
|
|
|
|
if (cmd->flags & CMD_FAST_FAIL)
|
|
crq->status = VIOSRP_ADAPTER_FAIL;
|
|
|
|
crq->IU_length = cpu_to_be16(cmd->rsp.len);
|
|
|
|
rc = h_send_crq(vscsi->dma_dev->unit_address,
|
|
be64_to_cpu(msg_hi),
|
|
be64_to_cpu(cmd->rsp.tag));
|
|
|
|
dev_dbg(&vscsi->dev, "send_messages: cmd %p, tag 0x%llx, rc %ld\n",
|
|
cmd, be64_to_cpu(cmd->rsp.tag),
|
|
rc);
|
|
|
|
/* if all ok free up the command
|
|
* element resources
|
|
*/
|
|
if (rc == H_SUCCESS) {
|
|
/* some movement has occurred */
|
|
vscsi->rsp_q_timer.timer_pops = 0;
|
|
list_del(&cmd->list);
|
|
|
|
ibmvscsis_free_cmd_resources(vscsi,
|
|
cmd);
|
|
} else {
|
|
srp_snd_msg_failed(vscsi, rc);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
} while (retry);
|
|
|
|
if (!rc) {
|
|
/*
|
|
* The timer could pop with the queue empty. If
|
|
* this happens, rc will always indicate a
|
|
* success; clear the pop count.
|
|
*/
|
|
vscsi->rsp_q_timer.timer_pops = 0;
|
|
}
|
|
} else {
|
|
ibmvscsis_free_cmd_qs(vscsi);
|
|
}
|
|
}
|
|
|
|
/* Called with intr lock held */
|
|
static void ibmvscsis_send_mad_resp(struct scsi_info *vscsi,
|
|
struct ibmvscsis_cmd *cmd,
|
|
struct viosrp_crq *crq)
|
|
{
|
|
struct iu_entry *iue = cmd->iue;
|
|
struct mad_common *mad = (struct mad_common *)&vio_iu(iue)->mad;
|
|
uint flag_bits = 0;
|
|
long rc;
|
|
|
|
dma_wmb();
|
|
rc = h_copy_rdma(sizeof(struct mad_common),
|
|
vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma,
|
|
vscsi->dds.window[REMOTE].liobn,
|
|
be64_to_cpu(crq->IU_data_ptr));
|
|
if (!rc) {
|
|
cmd->rsp.format = VIOSRP_MAD_FORMAT;
|
|
cmd->rsp.len = sizeof(struct mad_common);
|
|
cmd->rsp.tag = mad->tag;
|
|
list_add_tail(&cmd->list, &vscsi->waiting_rsp);
|
|
ibmvscsis_send_messages(vscsi);
|
|
} else {
|
|
dev_dbg(&vscsi->dev, "Error sending mad response, rc %ld\n",
|
|
rc);
|
|
if (rc == H_PERMISSION) {
|
|
if (connection_broken(vscsi))
|
|
flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED);
|
|
}
|
|
dev_err(&vscsi->dev, "mad: failed to copy to client, rc %ld\n",
|
|
rc);
|
|
|
|
ibmvscsis_free_cmd_resources(vscsi, cmd);
|
|
ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT,
|
|
flag_bits);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_mad() - Service a MAnagement Data gram.
|
|
* @vscsi: Pointer to our adapter structure
|
|
* @crq: Pointer to the CRQ entry containing the MAD request
|
|
*
|
|
* EXECUTION ENVIRONMENT:
|
|
* Interrupt, called with adapter lock held
|
|
*/
|
|
static long ibmvscsis_mad(struct scsi_info *vscsi, struct viosrp_crq *crq)
|
|
{
|
|
struct iu_entry *iue;
|
|
struct ibmvscsis_cmd *cmd;
|
|
struct mad_common *mad;
|
|
long rc = ADAPT_SUCCESS;
|
|
|
|
switch (vscsi->state) {
|
|
/*
|
|
* We have not exchanged Init Msgs yet, so this MAD was sent
|
|
* before the last Transport Event; client will not be
|
|
* expecting a response.
|
|
*/
|
|
case WAIT_CONNECTION:
|
|
dev_dbg(&vscsi->dev, "mad: in Wait Connection state, ignoring MAD, flags %d\n",
|
|
vscsi->flags);
|
|
return ADAPT_SUCCESS;
|
|
|
|
case SRP_PROCESSING:
|
|
case CONNECTED:
|
|
break;
|
|
|
|
/*
|
|
* We should never get here while we're in these states.
|
|
* Just log an error and get out.
|
|
*/
|
|
case UNCONFIGURING:
|
|
case WAIT_IDLE:
|
|
case ERR_DISCONNECT:
|
|
case ERR_DISCONNECT_RECONNECT:
|
|
default:
|
|
dev_err(&vscsi->dev, "mad: invalid adapter state %d for mad\n",
|
|
vscsi->state);
|
|
return ADAPT_SUCCESS;
|
|
}
|
|
|
|
cmd = ibmvscsis_get_free_cmd(vscsi);
|
|
if (!cmd) {
|
|
dev_err(&vscsi->dev, "mad: failed to get cmd, debit %d\n",
|
|
vscsi->debit);
|
|
ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
|
|
return ERROR;
|
|
}
|
|
iue = cmd->iue;
|
|
cmd->type = ADAPTER_MAD;
|
|
|
|
rc = ibmvscsis_copy_crq_packet(vscsi, cmd, crq);
|
|
if (!rc) {
|
|
mad = (struct mad_common *)&vio_iu(iue)->mad;
|
|
|
|
dev_dbg(&vscsi->dev, "mad: type %d\n", be32_to_cpu(mad->type));
|
|
|
|
rc = ibmvscsis_process_mad(vscsi, iue);
|
|
|
|
dev_dbg(&vscsi->dev, "mad: status %hd, rc %ld\n",
|
|
be16_to_cpu(mad->status), rc);
|
|
|
|
if (!rc)
|
|
ibmvscsis_send_mad_resp(vscsi, cmd, crq);
|
|
} else {
|
|
ibmvscsis_free_cmd_resources(vscsi, cmd);
|
|
}
|
|
|
|
dev_dbg(&vscsi->dev, "Leaving mad, rc %ld\n", rc);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_login_rsp() - Create/copy a login response notice to the client
|
|
* @vscsi: Pointer to our adapter structure
|
|
* @cmd: Pointer to the command for the SRP Login request
|
|
*
|
|
* EXECUTION ENVIRONMENT:
|
|
* Interrupt, interrupt lock held
|
|
*/
|
|
static long ibmvscsis_login_rsp(struct scsi_info *vscsi,
|
|
struct ibmvscsis_cmd *cmd)
|
|
{
|
|
struct iu_entry *iue = cmd->iue;
|
|
struct srp_login_rsp *rsp = &vio_iu(iue)->srp.login_rsp;
|
|
struct format_code *fmt;
|
|
uint flag_bits = 0;
|
|
long rc = ADAPT_SUCCESS;
|
|
|
|
memset(rsp, 0, sizeof(struct srp_login_rsp));
|
|
|
|
rsp->opcode = SRP_LOGIN_RSP;
|
|
rsp->req_lim_delta = cpu_to_be32(vscsi->request_limit);
|
|
rsp->tag = cmd->rsp.tag;
|
|
rsp->max_it_iu_len = cpu_to_be32(SRP_MAX_IU_LEN);
|
|
rsp->max_ti_iu_len = cpu_to_be32(SRP_MAX_IU_LEN);
|
|
fmt = (struct format_code *)&rsp->buf_fmt;
|
|
fmt->buffers = SUPPORTED_FORMATS;
|
|
vscsi->credit = 0;
|
|
|
|
cmd->rsp.len = sizeof(struct srp_login_rsp);
|
|
|
|
dma_wmb();
|
|
rc = h_copy_rdma(cmd->rsp.len, vscsi->dds.window[LOCAL].liobn,
|
|
iue->sbuf->dma, vscsi->dds.window[REMOTE].liobn,
|
|
be64_to_cpu(iue->remote_token));
|
|
|
|
switch (rc) {
|
|
case H_SUCCESS:
|
|
break;
|
|
|
|
case H_PERMISSION:
|
|
if (connection_broken(vscsi))
|
|
flag_bits = RESPONSE_Q_DOWN | CLIENT_FAILED;
|
|
dev_err(&vscsi->dev, "login_rsp: error copying to client, rc %ld\n",
|
|
rc);
|
|
ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT,
|
|
flag_bits);
|
|
break;
|
|
case H_SOURCE_PARM:
|
|
case H_DEST_PARM:
|
|
default:
|
|
dev_err(&vscsi->dev, "login_rsp: error copying to client, rc %ld\n",
|
|
rc);
|
|
ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
|
|
break;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_srp_login_rej() - Create/copy a login rejection notice to client
|
|
* @vscsi: Pointer to our adapter structure
|
|
* @cmd: Pointer to the command for the SRP Login request
|
|
* @reason: The reason the SRP Login is being rejected, per SRP protocol
|
|
*
|
|
* EXECUTION ENVIRONMENT:
|
|
* Interrupt, interrupt lock held
|
|
*/
|
|
static long ibmvscsis_srp_login_rej(struct scsi_info *vscsi,
|
|
struct ibmvscsis_cmd *cmd, u32 reason)
|
|
{
|
|
struct iu_entry *iue = cmd->iue;
|
|
struct srp_login_rej *rej = &vio_iu(iue)->srp.login_rej;
|
|
struct format_code *fmt;
|
|
uint flag_bits = 0;
|
|
long rc = ADAPT_SUCCESS;
|
|
|
|
memset(rej, 0, sizeof(*rej));
|
|
|
|
rej->opcode = SRP_LOGIN_REJ;
|
|
rej->reason = cpu_to_be32(reason);
|
|
rej->tag = cmd->rsp.tag;
|
|
fmt = (struct format_code *)&rej->buf_fmt;
|
|
fmt->buffers = SUPPORTED_FORMATS;
|
|
|
|
cmd->rsp.len = sizeof(*rej);
|
|
|
|
dma_wmb();
|
|
rc = h_copy_rdma(cmd->rsp.len, vscsi->dds.window[LOCAL].liobn,
|
|
iue->sbuf->dma, vscsi->dds.window[REMOTE].liobn,
|
|
be64_to_cpu(iue->remote_token));
|
|
|
|
switch (rc) {
|
|
case H_SUCCESS:
|
|
break;
|
|
case H_PERMISSION:
|
|
if (connection_broken(vscsi))
|
|
flag_bits = RESPONSE_Q_DOWN | CLIENT_FAILED;
|
|
dev_err(&vscsi->dev, "login_rej: error copying to client, rc %ld\n",
|
|
rc);
|
|
ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT,
|
|
flag_bits);
|
|
break;
|
|
case H_SOURCE_PARM:
|
|
case H_DEST_PARM:
|
|
default:
|
|
dev_err(&vscsi->dev, "login_rej: error copying to client, rc %ld\n",
|
|
rc);
|
|
ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
|
|
break;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int ibmvscsis_make_nexus(struct ibmvscsis_tport *tport)
|
|
{
|
|
char *name = tport->tport_name;
|
|
struct ibmvscsis_nexus *nexus;
|
|
struct scsi_info *vscsi = container_of(tport, struct scsi_info, tport);
|
|
int rc;
|
|
|
|
if (tport->ibmv_nexus) {
|
|
dev_dbg(&vscsi->dev, "tport->ibmv_nexus already exists\n");
|
|
return 0;
|
|
}
|
|
|
|
nexus = kzalloc(sizeof(*nexus), GFP_KERNEL);
|
|
if (!nexus) {
|
|
dev_err(&vscsi->dev, "Unable to allocate struct ibmvscsis_nexus\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
nexus->se_sess = target_setup_session(&tport->se_tpg, 0, 0,
|
|
TARGET_PROT_NORMAL, name, nexus,
|
|
NULL);
|
|
if (IS_ERR(nexus->se_sess)) {
|
|
rc = PTR_ERR(nexus->se_sess);
|
|
goto transport_init_fail;
|
|
}
|
|
|
|
tport->ibmv_nexus = nexus;
|
|
|
|
return 0;
|
|
|
|
transport_init_fail:
|
|
kfree(nexus);
|
|
return rc;
|
|
}
|
|
|
|
static int ibmvscsis_drop_nexus(struct ibmvscsis_tport *tport)
|
|
{
|
|
struct se_session *se_sess;
|
|
struct ibmvscsis_nexus *nexus;
|
|
|
|
nexus = tport->ibmv_nexus;
|
|
if (!nexus)
|
|
return -ENODEV;
|
|
|
|
se_sess = nexus->se_sess;
|
|
if (!se_sess)
|
|
return -ENODEV;
|
|
|
|
/*
|
|
* Release the SCSI I_T Nexus to the emulated ibmvscsis Target Port
|
|
*/
|
|
target_remove_session(se_sess);
|
|
tport->ibmv_nexus = NULL;
|
|
kfree(nexus);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_srp_login() - Process an SRP Login Request
|
|
* @vscsi: Pointer to our adapter structure
|
|
* @cmd: Command element to use to process the SRP Login request
|
|
* @crq: Pointer to CRQ entry containing the SRP Login request
|
|
*
|
|
* EXECUTION ENVIRONMENT:
|
|
* Interrupt, called with interrupt lock held
|
|
*/
|
|
static long ibmvscsis_srp_login(struct scsi_info *vscsi,
|
|
struct ibmvscsis_cmd *cmd,
|
|
struct viosrp_crq *crq)
|
|
{
|
|
struct iu_entry *iue = cmd->iue;
|
|
struct srp_login_req *req = &vio_iu(iue)->srp.login_req;
|
|
struct port_id {
|
|
__be64 id_extension;
|
|
__be64 io_guid;
|
|
} *iport, *tport;
|
|
struct format_code *fmt;
|
|
u32 reason = 0x0;
|
|
long rc = ADAPT_SUCCESS;
|
|
|
|
iport = (struct port_id *)req->initiator_port_id;
|
|
tport = (struct port_id *)req->target_port_id;
|
|
fmt = (struct format_code *)&req->req_buf_fmt;
|
|
if (be32_to_cpu(req->req_it_iu_len) > SRP_MAX_IU_LEN)
|
|
reason = SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE;
|
|
else if (be32_to_cpu(req->req_it_iu_len) < 64)
|
|
reason = SRP_LOGIN_REJ_UNABLE_ESTABLISH_CHANNEL;
|
|
else if ((be64_to_cpu(iport->id_extension) > (MAX_NUM_PORTS - 1)) ||
|
|
(be64_to_cpu(tport->id_extension) > (MAX_NUM_PORTS - 1)))
|
|
reason = SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL;
|
|
else if (req->req_flags & SRP_MULTICHAN_MULTI)
|
|
reason = SRP_LOGIN_REJ_MULTI_CHANNEL_UNSUPPORTED;
|
|
else if (fmt->buffers & (~SUPPORTED_FORMATS))
|
|
reason = SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT;
|
|
else if ((fmt->buffers & SUPPORTED_FORMATS) == 0)
|
|
reason = SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT;
|
|
|
|
if (vscsi->state == SRP_PROCESSING)
|
|
reason = SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED;
|
|
|
|
rc = ibmvscsis_make_nexus(&vscsi->tport);
|
|
if (rc)
|
|
reason = SRP_LOGIN_REJ_UNABLE_ESTABLISH_CHANNEL;
|
|
|
|
cmd->rsp.format = VIOSRP_SRP_FORMAT;
|
|
cmd->rsp.tag = req->tag;
|
|
|
|
dev_dbg(&vscsi->dev, "srp_login: reason 0x%x\n", reason);
|
|
|
|
if (reason)
|
|
rc = ibmvscsis_srp_login_rej(vscsi, cmd, reason);
|
|
else
|
|
rc = ibmvscsis_login_rsp(vscsi, cmd);
|
|
|
|
if (!rc) {
|
|
if (!reason)
|
|
vscsi->state = SRP_PROCESSING;
|
|
|
|
list_add_tail(&cmd->list, &vscsi->waiting_rsp);
|
|
ibmvscsis_send_messages(vscsi);
|
|
} else {
|
|
ibmvscsis_free_cmd_resources(vscsi, cmd);
|
|
}
|
|
|
|
dev_dbg(&vscsi->dev, "Leaving srp_login, rc %ld\n", rc);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_srp_i_logout() - Helper Function to close I_T Nexus
|
|
* @vscsi: Pointer to our adapter structure
|
|
* @cmd: Command element to use to process the Implicit Logout request
|
|
* @crq: Pointer to CRQ entry containing the Implicit Logout request
|
|
*
|
|
* Do the logic to close the I_T nexus. This function may not
|
|
* behave to specification.
|
|
*
|
|
* EXECUTION ENVIRONMENT:
|
|
* Interrupt, interrupt lock held
|
|
*/
|
|
static long ibmvscsis_srp_i_logout(struct scsi_info *vscsi,
|
|
struct ibmvscsis_cmd *cmd,
|
|
struct viosrp_crq *crq)
|
|
{
|
|
struct iu_entry *iue = cmd->iue;
|
|
struct srp_i_logout *log_out = &vio_iu(iue)->srp.i_logout;
|
|
|
|
if ((vscsi->debit > 0) || !list_empty(&vscsi->schedule_q) ||
|
|
!list_empty(&vscsi->waiting_rsp)) {
|
|
dev_err(&vscsi->dev, "i_logout: outstanding work\n");
|
|
ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0);
|
|
} else {
|
|
cmd->rsp.format = SRP_FORMAT;
|
|
cmd->rsp.tag = log_out->tag;
|
|
cmd->rsp.len = sizeof(struct mad_common);
|
|
list_add_tail(&cmd->list, &vscsi->waiting_rsp);
|
|
ibmvscsis_send_messages(vscsi);
|
|
|
|
ibmvscsis_post_disconnect(vscsi, WAIT_IDLE, 0);
|
|
}
|
|
|
|
return ADAPT_SUCCESS;
|
|
}
|
|
|
|
/* Called with intr lock held */
|
|
static void ibmvscsis_srp_cmd(struct scsi_info *vscsi, struct viosrp_crq *crq)
|
|
{
|
|
struct ibmvscsis_cmd *cmd;
|
|
struct iu_entry *iue;
|
|
struct srp_cmd *srp;
|
|
struct srp_tsk_mgmt *tsk;
|
|
long rc;
|
|
|
|
if (vscsi->request_limit - vscsi->debit <= 0) {
|
|
/* Client has exceeded request limit */
|
|
dev_err(&vscsi->dev, "Client exceeded the request limit (%d), debit %d\n",
|
|
vscsi->request_limit, vscsi->debit);
|
|
ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
|
|
return;
|
|
}
|
|
|
|
cmd = ibmvscsis_get_free_cmd(vscsi);
|
|
if (!cmd) {
|
|
dev_err(&vscsi->dev, "srp_cmd failed to get cmd, debit %d\n",
|
|
vscsi->debit);
|
|
ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
|
|
return;
|
|
}
|
|
iue = cmd->iue;
|
|
srp = &vio_iu(iue)->srp.cmd;
|
|
|
|
rc = ibmvscsis_copy_crq_packet(vscsi, cmd, crq);
|
|
if (rc) {
|
|
ibmvscsis_free_cmd_resources(vscsi, cmd);
|
|
return;
|
|
}
|
|
|
|
if (vscsi->state == SRP_PROCESSING) {
|
|
switch (srp->opcode) {
|
|
case SRP_LOGIN_REQ:
|
|
rc = ibmvscsis_srp_login(vscsi, cmd, crq);
|
|
break;
|
|
|
|
case SRP_TSK_MGMT:
|
|
tsk = &vio_iu(iue)->srp.tsk_mgmt;
|
|
dev_dbg(&vscsi->dev, "tsk_mgmt tag: %llu (0x%llx)\n",
|
|
tsk->tag, tsk->tag);
|
|
cmd->rsp.tag = tsk->tag;
|
|
vscsi->debit += 1;
|
|
cmd->type = TASK_MANAGEMENT;
|
|
list_add_tail(&cmd->list, &vscsi->schedule_q);
|
|
queue_work(vscsi->work_q, &cmd->work);
|
|
break;
|
|
|
|
case SRP_CMD:
|
|
dev_dbg(&vscsi->dev, "srp_cmd tag: %llu (0x%llx)\n",
|
|
srp->tag, srp->tag);
|
|
cmd->rsp.tag = srp->tag;
|
|
vscsi->debit += 1;
|
|
cmd->type = SCSI_CDB;
|
|
/*
|
|
* We want to keep track of work waiting for
|
|
* the workqueue.
|
|
*/
|
|
list_add_tail(&cmd->list, &vscsi->schedule_q);
|
|
queue_work(vscsi->work_q, &cmd->work);
|
|
break;
|
|
|
|
case SRP_I_LOGOUT:
|
|
rc = ibmvscsis_srp_i_logout(vscsi, cmd, crq);
|
|
break;
|
|
|
|
case SRP_CRED_RSP:
|
|
case SRP_AER_RSP:
|
|
default:
|
|
ibmvscsis_free_cmd_resources(vscsi, cmd);
|
|
dev_err(&vscsi->dev, "invalid srp cmd, opcode %d\n",
|
|
(uint)srp->opcode);
|
|
ibmvscsis_post_disconnect(vscsi,
|
|
ERR_DISCONNECT_RECONNECT, 0);
|
|
break;
|
|
}
|
|
} else if (srp->opcode == SRP_LOGIN_REQ && vscsi->state == CONNECTED) {
|
|
rc = ibmvscsis_srp_login(vscsi, cmd, crq);
|
|
} else {
|
|
ibmvscsis_free_cmd_resources(vscsi, cmd);
|
|
dev_err(&vscsi->dev, "Invalid state %d to handle srp cmd\n",
|
|
vscsi->state);
|
|
ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_ping_response() - Respond to a ping request
|
|
* @vscsi: Pointer to our adapter structure
|
|
*
|
|
* Let the client know that the server is alive and waiting on
|
|
* its native I/O stack.
|
|
* If any type of error occurs from the call to queue a ping
|
|
* response then the client is either not accepting or receiving
|
|
* interrupts. Disconnect with an error.
|
|
*
|
|
* EXECUTION ENVIRONMENT:
|
|
* Interrupt, interrupt lock held
|
|
*/
|
|
static long ibmvscsis_ping_response(struct scsi_info *vscsi)
|
|
{
|
|
struct viosrp_crq *crq;
|
|
u64 buffer[2] = { 0, 0 };
|
|
long rc;
|
|
|
|
crq = (struct viosrp_crq *)&buffer;
|
|
crq->valid = VALID_CMD_RESP_EL;
|
|
crq->format = (u8)MESSAGE_IN_CRQ;
|
|
crq->status = PING_RESPONSE;
|
|
|
|
rc = h_send_crq(vscsi->dds.unit_id, cpu_to_be64(buffer[MSG_HI]),
|
|
cpu_to_be64(buffer[MSG_LOW]));
|
|
|
|
switch (rc) {
|
|
case H_SUCCESS:
|
|
break;
|
|
case H_CLOSED:
|
|
vscsi->flags |= CLIENT_FAILED;
|
|
/* Fall through */
|
|
case H_DROPPED:
|
|
vscsi->flags |= RESPONSE_Q_DOWN;
|
|
/* Fall through */
|
|
case H_REMOTE_PARM:
|
|
dev_err(&vscsi->dev, "ping_response: h_send_crq failed, rc %ld\n",
|
|
rc);
|
|
ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
|
|
break;
|
|
default:
|
|
dev_err(&vscsi->dev, "ping_response: h_send_crq returned unknown rc %ld\n",
|
|
rc);
|
|
ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0);
|
|
break;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_parse_command() - Parse an element taken from the cmd rsp queue.
|
|
* @vscsi: Pointer to our adapter structure
|
|
* @crq: Pointer to CRQ element containing the SRP request
|
|
*
|
|
* This function will return success if the command queue element is valid
|
|
* and the srp iu or MAD request it pointed to was also valid. That does
|
|
* not mean that an error was not returned to the client.
|
|
*
|
|
* EXECUTION ENVIRONMENT:
|
|
* Interrupt, intr lock held
|
|
*/
|
|
static long ibmvscsis_parse_command(struct scsi_info *vscsi,
|
|
struct viosrp_crq *crq)
|
|
{
|
|
long rc = ADAPT_SUCCESS;
|
|
|
|
switch (crq->valid) {
|
|
case VALID_CMD_RESP_EL:
|
|
switch (crq->format) {
|
|
case OS400_FORMAT:
|
|
case AIX_FORMAT:
|
|
case LINUX_FORMAT:
|
|
case MAD_FORMAT:
|
|
if (vscsi->flags & PROCESSING_MAD) {
|
|
rc = ERROR;
|
|
dev_err(&vscsi->dev, "parse_command: already processing mad\n");
|
|
ibmvscsis_post_disconnect(vscsi,
|
|
ERR_DISCONNECT_RECONNECT,
|
|
0);
|
|
} else {
|
|
vscsi->flags |= PROCESSING_MAD;
|
|
rc = ibmvscsis_mad(vscsi, crq);
|
|
}
|
|
break;
|
|
|
|
case SRP_FORMAT:
|
|
ibmvscsis_srp_cmd(vscsi, crq);
|
|
break;
|
|
|
|
case MESSAGE_IN_CRQ:
|
|
if (crq->status == PING)
|
|
ibmvscsis_ping_response(vscsi);
|
|
break;
|
|
|
|
default:
|
|
dev_err(&vscsi->dev, "parse_command: invalid format %d\n",
|
|
(uint)crq->format);
|
|
ibmvscsis_post_disconnect(vscsi,
|
|
ERR_DISCONNECT_RECONNECT, 0);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case VALID_TRANS_EVENT:
|
|
rc = ibmvscsis_trans_event(vscsi, crq);
|
|
break;
|
|
|
|
case VALID_INIT_MSG:
|
|
rc = ibmvscsis_init_msg(vscsi, crq);
|
|
break;
|
|
|
|
default:
|
|
dev_err(&vscsi->dev, "parse_command: invalid valid field %d\n",
|
|
(uint)crq->valid);
|
|
ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Return only what the interrupt handler cares
|
|
* about. Most errors we keep right on trucking.
|
|
*/
|
|
rc = vscsi->flags & SCHEDULE_DISCONNECT;
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int read_dma_window(struct scsi_info *vscsi)
|
|
{
|
|
struct vio_dev *vdev = vscsi->dma_dev;
|
|
const __be32 *dma_window;
|
|
const __be32 *prop;
|
|
|
|
/* TODO Using of_parse_dma_window would be better, but it doesn't give
|
|
* a way to read multiple windows without already knowing the size of
|
|
* a window or the number of windows.
|
|
*/
|
|
dma_window = (const __be32 *)vio_get_attribute(vdev,
|
|
"ibm,my-dma-window",
|
|
NULL);
|
|
if (!dma_window) {
|
|
dev_err(&vscsi->dev, "Couldn't find ibm,my-dma-window property\n");
|
|
return -1;
|
|
}
|
|
|
|
vscsi->dds.window[LOCAL].liobn = be32_to_cpu(*dma_window);
|
|
dma_window++;
|
|
|
|
prop = (const __be32 *)vio_get_attribute(vdev, "ibm,#dma-address-cells",
|
|
NULL);
|
|
if (!prop) {
|
|
dev_warn(&vscsi->dev, "Couldn't find ibm,#dma-address-cells property\n");
|
|
dma_window++;
|
|
} else {
|
|
dma_window += be32_to_cpu(*prop);
|
|
}
|
|
|
|
prop = (const __be32 *)vio_get_attribute(vdev, "ibm,#dma-size-cells",
|
|
NULL);
|
|
if (!prop) {
|
|
dev_warn(&vscsi->dev, "Couldn't find ibm,#dma-size-cells property\n");
|
|
dma_window++;
|
|
} else {
|
|
dma_window += be32_to_cpu(*prop);
|
|
}
|
|
|
|
/* dma_window should point to the second window now */
|
|
vscsi->dds.window[REMOTE].liobn = be32_to_cpu(*dma_window);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct ibmvscsis_tport *ibmvscsis_lookup_port(const char *name)
|
|
{
|
|
struct ibmvscsis_tport *tport = NULL;
|
|
struct vio_dev *vdev;
|
|
struct scsi_info *vscsi;
|
|
|
|
spin_lock_bh(&ibmvscsis_dev_lock);
|
|
list_for_each_entry(vscsi, &ibmvscsis_dev_list, list) {
|
|
vdev = vscsi->dma_dev;
|
|
if (!strcmp(dev_name(&vdev->dev), name)) {
|
|
tport = &vscsi->tport;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock_bh(&ibmvscsis_dev_lock);
|
|
|
|
return tport;
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_parse_cmd() - Parse SRP Command
|
|
* @vscsi: Pointer to our adapter structure
|
|
* @cmd: Pointer to command element with SRP command
|
|
*
|
|
* Parse the srp command; if it is valid then submit it to tcm.
|
|
* Note: The return code does not reflect the status of the SCSI CDB.
|
|
*
|
|
* EXECUTION ENVIRONMENT:
|
|
* Process level
|
|
*/
|
|
static void ibmvscsis_parse_cmd(struct scsi_info *vscsi,
|
|
struct ibmvscsis_cmd *cmd)
|
|
{
|
|
struct iu_entry *iue = cmd->iue;
|
|
struct srp_cmd *srp = (struct srp_cmd *)iue->sbuf->buf;
|
|
struct ibmvscsis_nexus *nexus;
|
|
u64 data_len = 0;
|
|
enum dma_data_direction dir;
|
|
int attr = 0;
|
|
int rc = 0;
|
|
|
|
nexus = vscsi->tport.ibmv_nexus;
|
|
/*
|
|
* additional length in bytes. Note that the SRP spec says that
|
|
* additional length is in 4-byte words, but technically the
|
|
* additional length field is only the upper 6 bits of the byte.
|
|
* The lower 2 bits are reserved. If the lower 2 bits are 0 (as
|
|
* all reserved fields should be), then interpreting the byte as
|
|
* an int will yield the length in bytes.
|
|
*/
|
|
if (srp->add_cdb_len & 0x03) {
|
|
dev_err(&vscsi->dev, "parse_cmd: reserved bits set in IU\n");
|
|
spin_lock_bh(&vscsi->intr_lock);
|
|
ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
|
|
ibmvscsis_free_cmd_resources(vscsi, cmd);
|
|
spin_unlock_bh(&vscsi->intr_lock);
|
|
return;
|
|
}
|
|
|
|
if (srp_get_desc_table(srp, &dir, &data_len)) {
|
|
dev_err(&vscsi->dev, "0x%llx: parsing SRP descriptor table failed.\n",
|
|
srp->tag);
|
|
goto fail;
|
|
}
|
|
|
|
cmd->rsp.sol_not = srp->sol_not;
|
|
|
|
switch (srp->task_attr) {
|
|
case SRP_SIMPLE_TASK:
|
|
attr = TCM_SIMPLE_TAG;
|
|
break;
|
|
case SRP_ORDERED_TASK:
|
|
attr = TCM_ORDERED_TAG;
|
|
break;
|
|
case SRP_HEAD_TASK:
|
|
attr = TCM_HEAD_TAG;
|
|
break;
|
|
case SRP_ACA_TASK:
|
|
attr = TCM_ACA_TAG;
|
|
break;
|
|
default:
|
|
dev_err(&vscsi->dev, "Invalid task attribute %d\n",
|
|
srp->task_attr);
|
|
goto fail;
|
|
}
|
|
|
|
cmd->se_cmd.tag = be64_to_cpu(srp->tag);
|
|
|
|
spin_lock_bh(&vscsi->intr_lock);
|
|
list_add_tail(&cmd->list, &vscsi->active_q);
|
|
spin_unlock_bh(&vscsi->intr_lock);
|
|
|
|
srp->lun.scsi_lun[0] &= 0x3f;
|
|
|
|
rc = target_submit_cmd(&cmd->se_cmd, nexus->se_sess, srp->cdb,
|
|
cmd->sense_buf, scsilun_to_int(&srp->lun),
|
|
data_len, attr, dir, 0);
|
|
if (rc) {
|
|
dev_err(&vscsi->dev, "target_submit_cmd failed, rc %d\n", rc);
|
|
spin_lock_bh(&vscsi->intr_lock);
|
|
list_del(&cmd->list);
|
|
ibmvscsis_free_cmd_resources(vscsi, cmd);
|
|
spin_unlock_bh(&vscsi->intr_lock);
|
|
goto fail;
|
|
}
|
|
return;
|
|
|
|
fail:
|
|
spin_lock_bh(&vscsi->intr_lock);
|
|
ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
|
|
spin_unlock_bh(&vscsi->intr_lock);
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_parse_task() - Parse SRP Task Management Request
|
|
* @vscsi: Pointer to our adapter structure
|
|
* @cmd: Pointer to command element with SRP task management request
|
|
*
|
|
* Parse the srp task management request; if it is valid then submit it to tcm.
|
|
* Note: The return code does not reflect the status of the task management
|
|
* request.
|
|
*
|
|
* EXECUTION ENVIRONMENT:
|
|
* Processor level
|
|
*/
|
|
static void ibmvscsis_parse_task(struct scsi_info *vscsi,
|
|
struct ibmvscsis_cmd *cmd)
|
|
{
|
|
struct iu_entry *iue = cmd->iue;
|
|
struct srp_tsk_mgmt *srp_tsk = &vio_iu(iue)->srp.tsk_mgmt;
|
|
int tcm_type;
|
|
u64 tag_to_abort = 0;
|
|
int rc = 0;
|
|
struct ibmvscsis_nexus *nexus;
|
|
|
|
nexus = vscsi->tport.ibmv_nexus;
|
|
|
|
cmd->rsp.sol_not = srp_tsk->sol_not;
|
|
|
|
switch (srp_tsk->tsk_mgmt_func) {
|
|
case SRP_TSK_ABORT_TASK:
|
|
tcm_type = TMR_ABORT_TASK;
|
|
tag_to_abort = be64_to_cpu(srp_tsk->task_tag);
|
|
break;
|
|
case SRP_TSK_ABORT_TASK_SET:
|
|
tcm_type = TMR_ABORT_TASK_SET;
|
|
break;
|
|
case SRP_TSK_CLEAR_TASK_SET:
|
|
tcm_type = TMR_CLEAR_TASK_SET;
|
|
break;
|
|
case SRP_TSK_LUN_RESET:
|
|
tcm_type = TMR_LUN_RESET;
|
|
break;
|
|
case SRP_TSK_CLEAR_ACA:
|
|
tcm_type = TMR_CLEAR_ACA;
|
|
break;
|
|
default:
|
|
dev_err(&vscsi->dev, "unknown task mgmt func %d\n",
|
|
srp_tsk->tsk_mgmt_func);
|
|
cmd->se_cmd.se_tmr_req->response =
|
|
TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
|
|
rc = -1;
|
|
break;
|
|
}
|
|
|
|
if (!rc) {
|
|
cmd->se_cmd.tag = be64_to_cpu(srp_tsk->tag);
|
|
|
|
spin_lock_bh(&vscsi->intr_lock);
|
|
list_add_tail(&cmd->list, &vscsi->active_q);
|
|
spin_unlock_bh(&vscsi->intr_lock);
|
|
|
|
srp_tsk->lun.scsi_lun[0] &= 0x3f;
|
|
|
|
dev_dbg(&vscsi->dev, "calling submit_tmr, func %d\n",
|
|
srp_tsk->tsk_mgmt_func);
|
|
rc = target_submit_tmr(&cmd->se_cmd, nexus->se_sess, NULL,
|
|
scsilun_to_int(&srp_tsk->lun), srp_tsk,
|
|
tcm_type, GFP_KERNEL, tag_to_abort, 0);
|
|
if (rc) {
|
|
dev_err(&vscsi->dev, "target_submit_tmr failed, rc %d\n",
|
|
rc);
|
|
spin_lock_bh(&vscsi->intr_lock);
|
|
list_del(&cmd->list);
|
|
spin_unlock_bh(&vscsi->intr_lock);
|
|
cmd->se_cmd.se_tmr_req->response =
|
|
TMR_FUNCTION_REJECTED;
|
|
}
|
|
}
|
|
|
|
if (rc)
|
|
transport_send_check_condition_and_sense(&cmd->se_cmd, 0, 0);
|
|
}
|
|
|
|
static void ibmvscsis_scheduler(struct work_struct *work)
|
|
{
|
|
struct ibmvscsis_cmd *cmd = container_of(work, struct ibmvscsis_cmd,
|
|
work);
|
|
struct scsi_info *vscsi = cmd->adapter;
|
|
|
|
spin_lock_bh(&vscsi->intr_lock);
|
|
|
|
/* Remove from schedule_q */
|
|
list_del(&cmd->list);
|
|
|
|
/* Don't submit cmd if we're disconnecting */
|
|
if (vscsi->flags & (SCHEDULE_DISCONNECT | DISCONNECT_SCHEDULED)) {
|
|
ibmvscsis_free_cmd_resources(vscsi, cmd);
|
|
|
|
/* ibmvscsis_disconnect might be waiting for us */
|
|
if (list_empty(&vscsi->active_q) &&
|
|
list_empty(&vscsi->schedule_q) &&
|
|
(vscsi->flags & WAIT_FOR_IDLE)) {
|
|
vscsi->flags &= ~WAIT_FOR_IDLE;
|
|
complete(&vscsi->wait_idle);
|
|
}
|
|
|
|
spin_unlock_bh(&vscsi->intr_lock);
|
|
return;
|
|
}
|
|
|
|
spin_unlock_bh(&vscsi->intr_lock);
|
|
|
|
switch (cmd->type) {
|
|
case SCSI_CDB:
|
|
ibmvscsis_parse_cmd(vscsi, cmd);
|
|
break;
|
|
case TASK_MANAGEMENT:
|
|
ibmvscsis_parse_task(vscsi, cmd);
|
|
break;
|
|
default:
|
|
dev_err(&vscsi->dev, "scheduler, invalid cmd type %d\n",
|
|
cmd->type);
|
|
spin_lock_bh(&vscsi->intr_lock);
|
|
ibmvscsis_free_cmd_resources(vscsi, cmd);
|
|
spin_unlock_bh(&vscsi->intr_lock);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int ibmvscsis_alloc_cmds(struct scsi_info *vscsi, int num)
|
|
{
|
|
struct ibmvscsis_cmd *cmd;
|
|
int i;
|
|
|
|
INIT_LIST_HEAD(&vscsi->free_cmd);
|
|
vscsi->cmd_pool = kcalloc(num, sizeof(struct ibmvscsis_cmd),
|
|
GFP_KERNEL);
|
|
if (!vscsi->cmd_pool)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0, cmd = (struct ibmvscsis_cmd *)vscsi->cmd_pool; i < num;
|
|
i++, cmd++) {
|
|
cmd->abort_cmd = NULL;
|
|
cmd->adapter = vscsi;
|
|
INIT_WORK(&cmd->work, ibmvscsis_scheduler);
|
|
list_add_tail(&cmd->list, &vscsi->free_cmd);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ibmvscsis_free_cmds(struct scsi_info *vscsi)
|
|
{
|
|
kfree(vscsi->cmd_pool);
|
|
vscsi->cmd_pool = NULL;
|
|
INIT_LIST_HEAD(&vscsi->free_cmd);
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_service_wait_q() - Service Waiting Queue
|
|
* @timer: Pointer to timer which has expired
|
|
*
|
|
* This routine is called when the timer pops to service the waiting
|
|
* queue. Elements on the queue have completed, their responses have been
|
|
* copied to the client, but the client's response queue was full so
|
|
* the queue message could not be sent. The routine grabs the proper locks
|
|
* and calls send messages.
|
|
*
|
|
* EXECUTION ENVIRONMENT:
|
|
* called at interrupt level
|
|
*/
|
|
static enum hrtimer_restart ibmvscsis_service_wait_q(struct hrtimer *timer)
|
|
{
|
|
struct timer_cb *p_timer = container_of(timer, struct timer_cb, timer);
|
|
struct scsi_info *vscsi = container_of(p_timer, struct scsi_info,
|
|
rsp_q_timer);
|
|
|
|
spin_lock_bh(&vscsi->intr_lock);
|
|
p_timer->timer_pops += 1;
|
|
p_timer->started = false;
|
|
ibmvscsis_send_messages(vscsi);
|
|
spin_unlock_bh(&vscsi->intr_lock);
|
|
|
|
return HRTIMER_NORESTART;
|
|
}
|
|
|
|
static long ibmvscsis_alloctimer(struct scsi_info *vscsi)
|
|
{
|
|
struct timer_cb *p_timer;
|
|
|
|
p_timer = &vscsi->rsp_q_timer;
|
|
hrtimer_init(&p_timer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
|
|
|
|
p_timer->timer.function = ibmvscsis_service_wait_q;
|
|
p_timer->started = false;
|
|
p_timer->timer_pops = 0;
|
|
|
|
return ADAPT_SUCCESS;
|
|
}
|
|
|
|
static void ibmvscsis_freetimer(struct scsi_info *vscsi)
|
|
{
|
|
struct timer_cb *p_timer;
|
|
|
|
p_timer = &vscsi->rsp_q_timer;
|
|
|
|
(void)hrtimer_cancel(&p_timer->timer);
|
|
|
|
p_timer->started = false;
|
|
p_timer->timer_pops = 0;
|
|
}
|
|
|
|
static irqreturn_t ibmvscsis_interrupt(int dummy, void *data)
|
|
{
|
|
struct scsi_info *vscsi = data;
|
|
|
|
vio_disable_interrupts(vscsi->dma_dev);
|
|
tasklet_schedule(&vscsi->work_task);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_enable_change_state() - Set new state based on enabled status
|
|
* @vscsi: Pointer to our adapter structure
|
|
*
|
|
* This function determines our new state now that we are enabled. This
|
|
* may involve sending an Init Complete message to the client.
|
|
*
|
|
* Must be called with interrupt lock held.
|
|
*/
|
|
static long ibmvscsis_enable_change_state(struct scsi_info *vscsi)
|
|
{
|
|
int bytes;
|
|
long rc = ADAPT_SUCCESS;
|
|
|
|
bytes = vscsi->cmd_q.size * PAGE_SIZE;
|
|
rc = h_reg_crq(vscsi->dds.unit_id, vscsi->cmd_q.crq_token, bytes);
|
|
if (rc == H_CLOSED || rc == H_SUCCESS) {
|
|
vscsi->state = WAIT_CONNECTION;
|
|
rc = ibmvscsis_establish_new_q(vscsi);
|
|
}
|
|
|
|
if (rc != ADAPT_SUCCESS) {
|
|
vscsi->state = ERR_DISCONNECTED;
|
|
vscsi->flags |= RESPONSE_Q_DOWN;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_create_command_q() - Create Command Queue
|
|
* @vscsi: Pointer to our adapter structure
|
|
* @num_cmds: Currently unused. In the future, may be used to determine
|
|
* the size of the CRQ.
|
|
*
|
|
* Allocates memory for command queue maps remote memory into an ioba
|
|
* initializes the command response queue
|
|
*
|
|
* EXECUTION ENVIRONMENT:
|
|
* Process level only
|
|
*/
|
|
static long ibmvscsis_create_command_q(struct scsi_info *vscsi, int num_cmds)
|
|
{
|
|
int pages;
|
|
struct vio_dev *vdev = vscsi->dma_dev;
|
|
|
|
/* We might support multiple pages in the future, but just 1 for now */
|
|
pages = 1;
|
|
|
|
vscsi->cmd_q.size = pages;
|
|
|
|
vscsi->cmd_q.base_addr =
|
|
(struct viosrp_crq *)get_zeroed_page(GFP_KERNEL);
|
|
if (!vscsi->cmd_q.base_addr)
|
|
return -ENOMEM;
|
|
|
|
vscsi->cmd_q.mask = ((uint)pages * CRQ_PER_PAGE) - 1;
|
|
|
|
vscsi->cmd_q.crq_token = dma_map_single(&vdev->dev,
|
|
vscsi->cmd_q.base_addr,
|
|
PAGE_SIZE, DMA_BIDIRECTIONAL);
|
|
if (dma_mapping_error(&vdev->dev, vscsi->cmd_q.crq_token)) {
|
|
free_page((unsigned long)vscsi->cmd_q.base_addr);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_destroy_command_q - Destroy Command Queue
|
|
* @vscsi: Pointer to our adapter structure
|
|
*
|
|
* Releases memory for command queue and unmaps mapped remote memory.
|
|
*
|
|
* EXECUTION ENVIRONMENT:
|
|
* Process level only
|
|
*/
|
|
static void ibmvscsis_destroy_command_q(struct scsi_info *vscsi)
|
|
{
|
|
dma_unmap_single(&vscsi->dma_dev->dev, vscsi->cmd_q.crq_token,
|
|
PAGE_SIZE, DMA_BIDIRECTIONAL);
|
|
free_page((unsigned long)vscsi->cmd_q.base_addr);
|
|
vscsi->cmd_q.base_addr = NULL;
|
|
vscsi->state = NO_QUEUE;
|
|
}
|
|
|
|
static u8 ibmvscsis_fast_fail(struct scsi_info *vscsi,
|
|
struct ibmvscsis_cmd *cmd)
|
|
{
|
|
struct iu_entry *iue = cmd->iue;
|
|
struct se_cmd *se_cmd = &cmd->se_cmd;
|
|
struct srp_cmd *srp = (struct srp_cmd *)iue->sbuf->buf;
|
|
struct scsi_sense_hdr sshdr;
|
|
u8 rc = se_cmd->scsi_status;
|
|
|
|
if (vscsi->fast_fail && (READ_CMD(srp->cdb) || WRITE_CMD(srp->cdb)))
|
|
if (scsi_normalize_sense(se_cmd->sense_buffer,
|
|
se_cmd->scsi_sense_length, &sshdr))
|
|
if (sshdr.sense_key == HARDWARE_ERROR &&
|
|
(se_cmd->residual_count == 0 ||
|
|
se_cmd->residual_count == se_cmd->data_length)) {
|
|
rc = NO_SENSE;
|
|
cmd->flags |= CMD_FAST_FAIL;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* srp_build_response() - Build an SRP response buffer
|
|
* @vscsi: Pointer to our adapter structure
|
|
* @cmd: Pointer to command for which to send the response
|
|
* @len_p: Where to return the length of the IU response sent. This
|
|
* is needed to construct the CRQ response.
|
|
*
|
|
* Build the SRP response buffer and copy it to the client's memory space.
|
|
*/
|
|
static long srp_build_response(struct scsi_info *vscsi,
|
|
struct ibmvscsis_cmd *cmd, uint *len_p)
|
|
{
|
|
struct iu_entry *iue = cmd->iue;
|
|
struct se_cmd *se_cmd = &cmd->se_cmd;
|
|
struct srp_rsp *rsp;
|
|
uint len;
|
|
u32 rsp_code;
|
|
char *data;
|
|
u32 *tsk_status;
|
|
long rc = ADAPT_SUCCESS;
|
|
|
|
spin_lock_bh(&vscsi->intr_lock);
|
|
|
|
rsp = &vio_iu(iue)->srp.rsp;
|
|
len = sizeof(*rsp);
|
|
memset(rsp, 0, len);
|
|
data = rsp->data;
|
|
|
|
rsp->opcode = SRP_RSP;
|
|
|
|
rsp->req_lim_delta = cpu_to_be32(1 + vscsi->credit);
|
|
rsp->tag = cmd->rsp.tag;
|
|
rsp->flags = 0;
|
|
|
|
if (cmd->type == SCSI_CDB) {
|
|
rsp->status = ibmvscsis_fast_fail(vscsi, cmd);
|
|
if (rsp->status) {
|
|
dev_dbg(&vscsi->dev, "build_resp: cmd %p, scsi status %d\n",
|
|
cmd, (int)rsp->status);
|
|
ibmvscsis_determine_resid(se_cmd, rsp);
|
|
if (se_cmd->scsi_sense_length && se_cmd->sense_buffer) {
|
|
rsp->sense_data_len =
|
|
cpu_to_be32(se_cmd->scsi_sense_length);
|
|
rsp->flags |= SRP_RSP_FLAG_SNSVALID;
|
|
len += se_cmd->scsi_sense_length;
|
|
memcpy(data, se_cmd->sense_buffer,
|
|
se_cmd->scsi_sense_length);
|
|
}
|
|
rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >>
|
|
UCSOLNT_RESP_SHIFT;
|
|
} else if (cmd->flags & CMD_FAST_FAIL) {
|
|
dev_dbg(&vscsi->dev, "build_resp: cmd %p, fast fail\n",
|
|
cmd);
|
|
rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >>
|
|
UCSOLNT_RESP_SHIFT;
|
|
} else {
|
|
rsp->sol_not = (cmd->rsp.sol_not & SCSOLNT) >>
|
|
SCSOLNT_RESP_SHIFT;
|
|
}
|
|
} else {
|
|
/* this is task management */
|
|
rsp->status = 0;
|
|
rsp->resp_data_len = cpu_to_be32(4);
|
|
rsp->flags |= SRP_RSP_FLAG_RSPVALID;
|
|
|
|
switch (se_cmd->se_tmr_req->response) {
|
|
case TMR_FUNCTION_COMPLETE:
|
|
case TMR_TASK_DOES_NOT_EXIST:
|
|
rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_COMPLETE;
|
|
rsp->sol_not = (cmd->rsp.sol_not & SCSOLNT) >>
|
|
SCSOLNT_RESP_SHIFT;
|
|
break;
|
|
case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
|
|
case TMR_LUN_DOES_NOT_EXIST:
|
|
rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_NOT_SUPPORTED;
|
|
rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >>
|
|
UCSOLNT_RESP_SHIFT;
|
|
break;
|
|
case TMR_FUNCTION_FAILED:
|
|
case TMR_FUNCTION_REJECTED:
|
|
default:
|
|
rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_FAILED;
|
|
rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >>
|
|
UCSOLNT_RESP_SHIFT;
|
|
break;
|
|
}
|
|
|
|
tsk_status = (u32 *)data;
|
|
*tsk_status = cpu_to_be32(rsp_code);
|
|
data = (char *)(tsk_status + 1);
|
|
len += 4;
|
|
}
|
|
|
|
dma_wmb();
|
|
rc = h_copy_rdma(len, vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma,
|
|
vscsi->dds.window[REMOTE].liobn,
|
|
be64_to_cpu(iue->remote_token));
|
|
|
|
switch (rc) {
|
|
case H_SUCCESS:
|
|
vscsi->credit = 0;
|
|
*len_p = len;
|
|
break;
|
|
case H_PERMISSION:
|
|
if (connection_broken(vscsi))
|
|
vscsi->flags |= RESPONSE_Q_DOWN | CLIENT_FAILED;
|
|
|
|
dev_err(&vscsi->dev, "build_response: error copying to client, rc %ld, flags 0x%x, state 0x%hx\n",
|
|
rc, vscsi->flags, vscsi->state);
|
|
break;
|
|
case H_SOURCE_PARM:
|
|
case H_DEST_PARM:
|
|
default:
|
|
dev_err(&vscsi->dev, "build_response: error copying to client, rc %ld\n",
|
|
rc);
|
|
break;
|
|
}
|
|
|
|
spin_unlock_bh(&vscsi->intr_lock);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int ibmvscsis_rdma(struct ibmvscsis_cmd *cmd, struct scatterlist *sg,
|
|
int nsg, struct srp_direct_buf *md, int nmd,
|
|
enum dma_data_direction dir, unsigned int bytes)
|
|
{
|
|
struct iu_entry *iue = cmd->iue;
|
|
struct srp_target *target = iue->target;
|
|
struct scsi_info *vscsi = target->ldata;
|
|
struct scatterlist *sgp;
|
|
dma_addr_t client_ioba, server_ioba;
|
|
ulong buf_len;
|
|
ulong client_len, server_len;
|
|
int md_idx;
|
|
long tx_len;
|
|
long rc = 0;
|
|
|
|
if (bytes == 0)
|
|
return 0;
|
|
|
|
sgp = sg;
|
|
client_len = 0;
|
|
server_len = 0;
|
|
md_idx = 0;
|
|
tx_len = bytes;
|
|
|
|
do {
|
|
if (client_len == 0) {
|
|
if (md_idx >= nmd) {
|
|
dev_err(&vscsi->dev, "rdma: ran out of client memory descriptors\n");
|
|
rc = -EIO;
|
|
break;
|
|
}
|
|
client_ioba = be64_to_cpu(md[md_idx].va);
|
|
client_len = be32_to_cpu(md[md_idx].len);
|
|
}
|
|
if (server_len == 0) {
|
|
if (!sgp) {
|
|
dev_err(&vscsi->dev, "rdma: ran out of scatter/gather list\n");
|
|
rc = -EIO;
|
|
break;
|
|
}
|
|
server_ioba = sg_dma_address(sgp);
|
|
server_len = sg_dma_len(sgp);
|
|
}
|
|
|
|
buf_len = tx_len;
|
|
|
|
if (buf_len > client_len)
|
|
buf_len = client_len;
|
|
|
|
if (buf_len > server_len)
|
|
buf_len = server_len;
|
|
|
|
if (buf_len > max_vdma_size)
|
|
buf_len = max_vdma_size;
|
|
|
|
if (dir == DMA_TO_DEVICE) {
|
|
/* read from client */
|
|
rc = h_copy_rdma(buf_len,
|
|
vscsi->dds.window[REMOTE].liobn,
|
|
client_ioba,
|
|
vscsi->dds.window[LOCAL].liobn,
|
|
server_ioba);
|
|
} else {
|
|
/* The h_copy_rdma will cause phyp, running in another
|
|
* partition, to read memory, so we need to make sure
|
|
* the data has been written out, hence these syncs.
|
|
*/
|
|
/* ensure that everything is in memory */
|
|
isync();
|
|
/* ensure that memory has been made visible */
|
|
dma_wmb();
|
|
rc = h_copy_rdma(buf_len,
|
|
vscsi->dds.window[LOCAL].liobn,
|
|
server_ioba,
|
|
vscsi->dds.window[REMOTE].liobn,
|
|
client_ioba);
|
|
}
|
|
switch (rc) {
|
|
case H_SUCCESS:
|
|
break;
|
|
case H_PERMISSION:
|
|
case H_SOURCE_PARM:
|
|
case H_DEST_PARM:
|
|
if (connection_broken(vscsi)) {
|
|
spin_lock_bh(&vscsi->intr_lock);
|
|
vscsi->flags |=
|
|
(RESPONSE_Q_DOWN | CLIENT_FAILED);
|
|
spin_unlock_bh(&vscsi->intr_lock);
|
|
}
|
|
dev_err(&vscsi->dev, "rdma: h_copy_rdma failed, rc %ld\n",
|
|
rc);
|
|
break;
|
|
|
|
default:
|
|
dev_err(&vscsi->dev, "rdma: unknown error %ld from h_copy_rdma\n",
|
|
rc);
|
|
break;
|
|
}
|
|
|
|
if (!rc) {
|
|
tx_len -= buf_len;
|
|
if (tx_len) {
|
|
client_len -= buf_len;
|
|
if (client_len == 0)
|
|
md_idx++;
|
|
else
|
|
client_ioba += buf_len;
|
|
|
|
server_len -= buf_len;
|
|
if (server_len == 0)
|
|
sgp = sg_next(sgp);
|
|
else
|
|
server_ioba += buf_len;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
} while (!rc);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* ibmvscsis_handle_crq() - Handle CRQ
|
|
* @data: Pointer to our adapter structure
|
|
*
|
|
* Read the command elements from the command queue and copy the payloads
|
|
* associated with the command elements to local memory and execute the
|
|
* SRP requests.
|
|
*
|
|
* Note: this is an edge triggered interrupt. It can not be shared.
|
|
*/
|
|
static void ibmvscsis_handle_crq(unsigned long data)
|
|
{
|
|
struct scsi_info *vscsi = (struct scsi_info *)data;
|
|
struct viosrp_crq *crq;
|
|
long rc;
|
|
bool ack = true;
|
|
volatile u8 valid;
|
|
|
|
spin_lock_bh(&vscsi->intr_lock);
|
|
|
|
dev_dbg(&vscsi->dev, "got interrupt\n");
|
|
|
|
/*
|
|
* if we are in a path where we are waiting for all pending commands
|
|
* to complete because we received a transport event and anything in
|
|
* the command queue is for a new connection, do nothing
|
|
*/
|
|
if (TARGET_STOP(vscsi)) {
|
|
vio_enable_interrupts(vscsi->dma_dev);
|
|
|
|
dev_dbg(&vscsi->dev, "handle_crq, don't process: flags 0x%x, state 0x%hx\n",
|
|
vscsi->flags, vscsi->state);
|
|
spin_unlock_bh(&vscsi->intr_lock);
|
|
return;
|
|
}
|
|
|
|
rc = vscsi->flags & SCHEDULE_DISCONNECT;
|
|
crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index;
|
|
valid = crq->valid;
|
|
dma_rmb();
|
|
|
|
while (valid) {
|
|
/*
|
|
* These are edege triggered interrupts. After dropping out of
|
|
* the while loop, the code must check for work since an
|
|
* interrupt could be lost, and an elment be left on the queue,
|
|
* hence the label.
|
|
*/
|
|
cmd_work:
|
|
vscsi->cmd_q.index =
|
|
(vscsi->cmd_q.index + 1) & vscsi->cmd_q.mask;
|
|
|
|
if (!rc) {
|
|
rc = ibmvscsis_parse_command(vscsi, crq);
|
|
} else {
|
|
if ((uint)crq->valid == VALID_TRANS_EVENT) {
|
|
/*
|
|
* must service the transport layer events even
|
|
* in an error state, dont break out until all
|
|
* the consecutive transport events have been
|
|
* processed
|
|
*/
|
|
rc = ibmvscsis_trans_event(vscsi, crq);
|
|
} else if (vscsi->flags & TRANS_EVENT) {
|
|
/*
|
|
* if a transport event has occurred leave
|
|
* everything but transport events on the queue
|
|
*
|
|
* need to decrement the queue index so we can
|
|
* look at the element again
|
|
*/
|
|
if (vscsi->cmd_q.index)
|
|
vscsi->cmd_q.index -= 1;
|
|
else
|
|
/*
|
|
* index is at 0 it just wrapped.
|
|
* have it index last element in q
|
|
*/
|
|
vscsi->cmd_q.index = vscsi->cmd_q.mask;
|
|
break;
|
|
}
|
|
}
|
|
|
|
crq->valid = INVALIDATE_CMD_RESP_EL;
|
|
|
|
crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index;
|
|
valid = crq->valid;
|
|
dma_rmb();
|
|
}
|
|
|
|
if (!rc) {
|
|
if (ack) {
|
|
vio_enable_interrupts(vscsi->dma_dev);
|
|
ack = false;
|
|
dev_dbg(&vscsi->dev, "handle_crq, reenabling interrupts\n");
|
|
}
|
|
valid = crq->valid;
|
|
dma_rmb();
|
|
if (valid)
|
|
goto cmd_work;
|
|
} else {
|
|
dev_dbg(&vscsi->dev, "handle_crq, error: flags 0x%x, state 0x%hx, crq index 0x%x\n",
|
|
vscsi->flags, vscsi->state, vscsi->cmd_q.index);
|
|
}
|
|
|
|
dev_dbg(&vscsi->dev, "Leaving handle_crq: schedule_q empty %d, flags 0x%x, state 0x%hx\n",
|
|
(int)list_empty(&vscsi->schedule_q), vscsi->flags,
|
|
vscsi->state);
|
|
|
|
spin_unlock_bh(&vscsi->intr_lock);
|
|
}
|
|
|
|
static int ibmvscsis_probe(struct vio_dev *vdev,
|
|
const struct vio_device_id *id)
|
|
{
|
|
struct scsi_info *vscsi;
|
|
int rc = 0;
|
|
long hrc = 0;
|
|
char wq_name[24];
|
|
|
|
vscsi = kzalloc(sizeof(*vscsi), GFP_KERNEL);
|
|
if (!vscsi) {
|
|
rc = -ENOMEM;
|
|
dev_err(&vdev->dev, "probe: allocation of adapter failed\n");
|
|
return rc;
|
|
}
|
|
|
|
vscsi->dma_dev = vdev;
|
|
vscsi->dev = vdev->dev;
|
|
INIT_LIST_HEAD(&vscsi->schedule_q);
|
|
INIT_LIST_HEAD(&vscsi->waiting_rsp);
|
|
INIT_LIST_HEAD(&vscsi->active_q);
|
|
|
|
snprintf(vscsi->tport.tport_name, IBMVSCSIS_NAMELEN, "%s",
|
|
dev_name(&vdev->dev));
|
|
|
|
dev_dbg(&vscsi->dev, "probe tport_name: %s\n", vscsi->tport.tport_name);
|
|
|
|
rc = read_dma_window(vscsi);
|
|
if (rc)
|
|
goto free_adapter;
|
|
dev_dbg(&vscsi->dev, "Probe: liobn 0x%x, riobn 0x%x\n",
|
|
vscsi->dds.window[LOCAL].liobn,
|
|
vscsi->dds.window[REMOTE].liobn);
|
|
|
|
snprintf(vscsi->eye, sizeof(vscsi->eye), "VSCSI %s", vdev->name);
|
|
|
|
vscsi->dds.unit_id = vdev->unit_address;
|
|
strscpy(vscsi->dds.partition_name, partition_name,
|
|
sizeof(vscsi->dds.partition_name));
|
|
vscsi->dds.partition_num = partition_number;
|
|
|
|
spin_lock_bh(&ibmvscsis_dev_lock);
|
|
list_add_tail(&vscsi->list, &ibmvscsis_dev_list);
|
|
spin_unlock_bh(&ibmvscsis_dev_lock);
|
|
|
|
/*
|
|
* TBD: How do we determine # of cmds to request? Do we know how
|
|
* many "children" we have?
|
|
*/
|
|
vscsi->request_limit = INITIAL_SRP_LIMIT;
|
|
rc = srp_target_alloc(&vscsi->target, &vdev->dev, vscsi->request_limit,
|
|
SRP_MAX_IU_LEN);
|
|
if (rc)
|
|
goto rem_list;
|
|
|
|
vscsi->target.ldata = vscsi;
|
|
|
|
rc = ibmvscsis_alloc_cmds(vscsi, vscsi->request_limit);
|
|
if (rc) {
|
|
dev_err(&vscsi->dev, "alloc_cmds failed, rc %d, num %d\n",
|
|
rc, vscsi->request_limit);
|
|
goto free_target;
|
|
}
|
|
|
|
/*
|
|
* Note: the lock is used in freeing timers, so must initialize
|
|
* first so that ordering in case of error is correct.
|
|
*/
|
|
spin_lock_init(&vscsi->intr_lock);
|
|
|
|
rc = ibmvscsis_alloctimer(vscsi);
|
|
if (rc) {
|
|
dev_err(&vscsi->dev, "probe: alloctimer failed, rc %d\n", rc);
|
|
goto free_cmds;
|
|
}
|
|
|
|
rc = ibmvscsis_create_command_q(vscsi, 256);
|
|
if (rc) {
|
|
dev_err(&vscsi->dev, "probe: create_command_q failed, rc %d\n",
|
|
rc);
|
|
goto free_timer;
|
|
}
|
|
|
|
vscsi->map_buf = kzalloc(PAGE_SIZE, GFP_KERNEL);
|
|
if (!vscsi->map_buf) {
|
|
rc = -ENOMEM;
|
|
dev_err(&vscsi->dev, "probe: allocating cmd buffer failed\n");
|
|
goto destroy_queue;
|
|
}
|
|
|
|
vscsi->map_ioba = dma_map_single(&vdev->dev, vscsi->map_buf, PAGE_SIZE,
|
|
DMA_BIDIRECTIONAL);
|
|
if (dma_mapping_error(&vdev->dev, vscsi->map_ioba)) {
|
|
rc = -ENOMEM;
|
|
dev_err(&vscsi->dev, "probe: error mapping command buffer\n");
|
|
goto free_buf;
|
|
}
|
|
|
|
hrc = h_vioctl(vscsi->dds.unit_id, H_GET_PARTNER_INFO,
|
|
(u64)vscsi->map_ioba | ((u64)PAGE_SIZE << 32), 0, 0, 0,
|
|
0);
|
|
if (hrc == H_SUCCESS)
|
|
vscsi->client_data.partition_number =
|
|
be64_to_cpu(*(u64 *)vscsi->map_buf);
|
|
/*
|
|
* We expect the VIOCTL to fail if we're configured as "any
|
|
* client can connect" and the client isn't activated yet.
|
|
* We'll make the call again when he sends an init msg.
|
|
*/
|
|
dev_dbg(&vscsi->dev, "probe hrc %ld, client partition num %d\n",
|
|
hrc, vscsi->client_data.partition_number);
|
|
|
|
tasklet_init(&vscsi->work_task, ibmvscsis_handle_crq,
|
|
(unsigned long)vscsi);
|
|
|
|
init_completion(&vscsi->wait_idle);
|
|
init_completion(&vscsi->unconfig);
|
|
|
|
snprintf(wq_name, 24, "ibmvscsis%s", dev_name(&vdev->dev));
|
|
vscsi->work_q = create_workqueue(wq_name);
|
|
if (!vscsi->work_q) {
|
|
rc = -ENOMEM;
|
|
dev_err(&vscsi->dev, "create_workqueue failed\n");
|
|
goto unmap_buf;
|
|
}
|
|
|
|
rc = request_irq(vdev->irq, ibmvscsis_interrupt, 0, "ibmvscsis", vscsi);
|
|
if (rc) {
|
|
rc = -EPERM;
|
|
dev_err(&vscsi->dev, "probe: request_irq failed, rc %d\n", rc);
|
|
goto destroy_WQ;
|
|
}
|
|
|
|
vscsi->state = WAIT_ENABLED;
|
|
|
|
dev_set_drvdata(&vdev->dev, vscsi);
|
|
|
|
return 0;
|
|
|
|
destroy_WQ:
|
|
destroy_workqueue(vscsi->work_q);
|
|
unmap_buf:
|
|
dma_unmap_single(&vdev->dev, vscsi->map_ioba, PAGE_SIZE,
|
|
DMA_BIDIRECTIONAL);
|
|
free_buf:
|
|
kfree(vscsi->map_buf);
|
|
destroy_queue:
|
|
tasklet_kill(&vscsi->work_task);
|
|
ibmvscsis_unregister_command_q(vscsi);
|
|
ibmvscsis_destroy_command_q(vscsi);
|
|
free_timer:
|
|
ibmvscsis_freetimer(vscsi);
|
|
free_cmds:
|
|
ibmvscsis_free_cmds(vscsi);
|
|
free_target:
|
|
srp_target_free(&vscsi->target);
|
|
rem_list:
|
|
spin_lock_bh(&ibmvscsis_dev_lock);
|
|
list_del(&vscsi->list);
|
|
spin_unlock_bh(&ibmvscsis_dev_lock);
|
|
free_adapter:
|
|
kfree(vscsi);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int ibmvscsis_remove(struct vio_dev *vdev)
|
|
{
|
|
struct scsi_info *vscsi = dev_get_drvdata(&vdev->dev);
|
|
|
|
dev_dbg(&vscsi->dev, "remove (%s)\n", dev_name(&vscsi->dma_dev->dev));
|
|
|
|
spin_lock_bh(&vscsi->intr_lock);
|
|
ibmvscsis_post_disconnect(vscsi, UNCONFIGURING, 0);
|
|
vscsi->flags |= CFG_SLEEPING;
|
|
spin_unlock_bh(&vscsi->intr_lock);
|
|
wait_for_completion(&vscsi->unconfig);
|
|
|
|
vio_disable_interrupts(vdev);
|
|
free_irq(vdev->irq, vscsi);
|
|
destroy_workqueue(vscsi->work_q);
|
|
dma_unmap_single(&vdev->dev, vscsi->map_ioba, PAGE_SIZE,
|
|
DMA_BIDIRECTIONAL);
|
|
kfree(vscsi->map_buf);
|
|
tasklet_kill(&vscsi->work_task);
|
|
ibmvscsis_destroy_command_q(vscsi);
|
|
ibmvscsis_freetimer(vscsi);
|
|
ibmvscsis_free_cmds(vscsi);
|
|
srp_target_free(&vscsi->target);
|
|
spin_lock_bh(&ibmvscsis_dev_lock);
|
|
list_del(&vscsi->list);
|
|
spin_unlock_bh(&ibmvscsis_dev_lock);
|
|
kfree(vscsi);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t system_id_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
return snprintf(buf, PAGE_SIZE, "%s\n", system_id);
|
|
}
|
|
|
|
static ssize_t partition_number_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
return snprintf(buf, PAGE_SIZE, "%x\n", partition_number);
|
|
}
|
|
|
|
static ssize_t unit_address_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct scsi_info *vscsi = container_of(dev, struct scsi_info, dev);
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%x\n", vscsi->dma_dev->unit_address);
|
|
}
|
|
|
|
static int ibmvscsis_get_system_info(void)
|
|
{
|
|
struct device_node *rootdn, *vdevdn;
|
|
const char *id, *model, *name;
|
|
const uint *num;
|
|
|
|
rootdn = of_find_node_by_path("/");
|
|
if (!rootdn)
|
|
return -ENOENT;
|
|
|
|
model = of_get_property(rootdn, "model", NULL);
|
|
id = of_get_property(rootdn, "system-id", NULL);
|
|
if (model && id)
|
|
snprintf(system_id, sizeof(system_id), "%s-%s", model, id);
|
|
|
|
name = of_get_property(rootdn, "ibm,partition-name", NULL);
|
|
if (name)
|
|
strncpy(partition_name, name, sizeof(partition_name));
|
|
|
|
num = of_get_property(rootdn, "ibm,partition-no", NULL);
|
|
if (num)
|
|
partition_number = of_read_number(num, 1);
|
|
|
|
of_node_put(rootdn);
|
|
|
|
vdevdn = of_find_node_by_path("/vdevice");
|
|
if (vdevdn) {
|
|
const uint *mvds;
|
|
|
|
mvds = of_get_property(vdevdn, "ibm,max-virtual-dma-size",
|
|
NULL);
|
|
if (mvds)
|
|
max_vdma_size = *mvds;
|
|
of_node_put(vdevdn);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static char *ibmvscsis_get_fabric_wwn(struct se_portal_group *se_tpg)
|
|
{
|
|
struct ibmvscsis_tport *tport =
|
|
container_of(se_tpg, struct ibmvscsis_tport, se_tpg);
|
|
|
|
return tport->tport_name;
|
|
}
|
|
|
|
static u16 ibmvscsis_get_tag(struct se_portal_group *se_tpg)
|
|
{
|
|
struct ibmvscsis_tport *tport =
|
|
container_of(se_tpg, struct ibmvscsis_tport, se_tpg);
|
|
|
|
return tport->tport_tpgt;
|
|
}
|
|
|
|
static u32 ibmvscsis_get_default_depth(struct se_portal_group *se_tpg)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static int ibmvscsis_check_true(struct se_portal_group *se_tpg)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static int ibmvscsis_check_false(struct se_portal_group *se_tpg)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static u32 ibmvscsis_tpg_get_inst_index(struct se_portal_group *se_tpg)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static int ibmvscsis_check_stop_free(struct se_cmd *se_cmd)
|
|
{
|
|
return target_put_sess_cmd(se_cmd);
|
|
}
|
|
|
|
static void ibmvscsis_release_cmd(struct se_cmd *se_cmd)
|
|
{
|
|
struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
|
|
se_cmd);
|
|
struct scsi_info *vscsi = cmd->adapter;
|
|
|
|
spin_lock_bh(&vscsi->intr_lock);
|
|
/* Remove from active_q */
|
|
list_move_tail(&cmd->list, &vscsi->waiting_rsp);
|
|
ibmvscsis_send_messages(vscsi);
|
|
spin_unlock_bh(&vscsi->intr_lock);
|
|
}
|
|
|
|
static u32 ibmvscsis_sess_get_index(struct se_session *se_sess)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int ibmvscsis_write_pending(struct se_cmd *se_cmd)
|
|
{
|
|
struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
|
|
se_cmd);
|
|
struct scsi_info *vscsi = cmd->adapter;
|
|
struct iu_entry *iue = cmd->iue;
|
|
int rc;
|
|
|
|
/*
|
|
* If CLIENT_FAILED OR RESPONSE_Q_DOWN, then just return success
|
|
* since LIO can't do anything about it, and we dont want to
|
|
* attempt an srp_transfer_data.
|
|
*/
|
|
if ((vscsi->flags & (CLIENT_FAILED | RESPONSE_Q_DOWN))) {
|
|
dev_err(&vscsi->dev, "write_pending failed since: %d\n",
|
|
vscsi->flags);
|
|
return -EIO;
|
|
|
|
}
|
|
|
|
rc = srp_transfer_data(cmd, &vio_iu(iue)->srp.cmd, ibmvscsis_rdma,
|
|
1, 1);
|
|
if (rc) {
|
|
dev_err(&vscsi->dev, "srp_transfer_data() failed: %d\n", rc);
|
|
return -EIO;
|
|
}
|
|
/*
|
|
* We now tell TCM to add this WRITE CDB directly into the TCM storage
|
|
* object execution queue.
|
|
*/
|
|
target_execute_cmd(se_cmd);
|
|
return 0;
|
|
}
|
|
|
|
static void ibmvscsis_set_default_node_attrs(struct se_node_acl *nacl)
|
|
{
|
|
}
|
|
|
|
static int ibmvscsis_get_cmd_state(struct se_cmd *se_cmd)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int ibmvscsis_queue_data_in(struct se_cmd *se_cmd)
|
|
{
|
|
struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
|
|
se_cmd);
|
|
struct iu_entry *iue = cmd->iue;
|
|
struct scsi_info *vscsi = cmd->adapter;
|
|
uint len = 0;
|
|
int rc;
|
|
|
|
rc = srp_transfer_data(cmd, &vio_iu(iue)->srp.cmd, ibmvscsis_rdma, 1,
|
|
1);
|
|
if (rc) {
|
|
dev_err(&vscsi->dev, "srp_transfer_data failed: %d\n", rc);
|
|
se_cmd->scsi_sense_length = 18;
|
|
memset(se_cmd->sense_buffer, 0, se_cmd->scsi_sense_length);
|
|
/* Logical Unit Communication Time-out asc/ascq = 0x0801 */
|
|
scsi_build_sense_buffer(0, se_cmd->sense_buffer, MEDIUM_ERROR,
|
|
0x08, 0x01);
|
|
}
|
|
|
|
srp_build_response(vscsi, cmd, &len);
|
|
cmd->rsp.format = SRP_FORMAT;
|
|
cmd->rsp.len = len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ibmvscsis_queue_status(struct se_cmd *se_cmd)
|
|
{
|
|
struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
|
|
se_cmd);
|
|
struct scsi_info *vscsi = cmd->adapter;
|
|
uint len;
|
|
|
|
dev_dbg(&vscsi->dev, "queue_status %p\n", se_cmd);
|
|
|
|
srp_build_response(vscsi, cmd, &len);
|
|
cmd->rsp.format = SRP_FORMAT;
|
|
cmd->rsp.len = len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ibmvscsis_queue_tm_rsp(struct se_cmd *se_cmd)
|
|
{
|
|
struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
|
|
se_cmd);
|
|
struct scsi_info *vscsi = cmd->adapter;
|
|
struct ibmvscsis_cmd *cmd_itr;
|
|
struct iu_entry *iue = iue = cmd->iue;
|
|
struct srp_tsk_mgmt *srp_tsk = &vio_iu(iue)->srp.tsk_mgmt;
|
|
u64 tag_to_abort = be64_to_cpu(srp_tsk->task_tag);
|
|
uint len;
|
|
|
|
dev_dbg(&vscsi->dev, "queue_tm_rsp %p, status %d\n",
|
|
se_cmd, (int)se_cmd->se_tmr_req->response);
|
|
|
|
if (srp_tsk->tsk_mgmt_func == SRP_TSK_ABORT_TASK &&
|
|
cmd->se_cmd.se_tmr_req->response == TMR_TASK_DOES_NOT_EXIST) {
|
|
spin_lock_bh(&vscsi->intr_lock);
|
|
list_for_each_entry(cmd_itr, &vscsi->active_q, list) {
|
|
if (tag_to_abort == cmd_itr->se_cmd.tag) {
|
|
cmd_itr->abort_cmd = cmd;
|
|
cmd->flags |= DELAY_SEND;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock_bh(&vscsi->intr_lock);
|
|
}
|
|
|
|
srp_build_response(vscsi, cmd, &len);
|
|
cmd->rsp.format = SRP_FORMAT;
|
|
cmd->rsp.len = len;
|
|
}
|
|
|
|
static void ibmvscsis_aborted_task(struct se_cmd *se_cmd)
|
|
{
|
|
struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
|
|
se_cmd);
|
|
struct scsi_info *vscsi = cmd->adapter;
|
|
|
|
dev_dbg(&vscsi->dev, "ibmvscsis_aborted_task %p task_tag: %llu\n",
|
|
se_cmd, se_cmd->tag);
|
|
}
|
|
|
|
static struct se_wwn *ibmvscsis_make_tport(struct target_fabric_configfs *tf,
|
|
struct config_group *group,
|
|
const char *name)
|
|
{
|
|
struct ibmvscsis_tport *tport;
|
|
struct scsi_info *vscsi;
|
|
|
|
tport = ibmvscsis_lookup_port(name);
|
|
if (tport) {
|
|
vscsi = container_of(tport, struct scsi_info, tport);
|
|
tport->tport_proto_id = SCSI_PROTOCOL_SRP;
|
|
dev_dbg(&vscsi->dev, "make_tport(%s), pointer:%p, tport_id:%x\n",
|
|
name, tport, tport->tport_proto_id);
|
|
return &tport->tport_wwn;
|
|
}
|
|
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
static void ibmvscsis_drop_tport(struct se_wwn *wwn)
|
|
{
|
|
struct ibmvscsis_tport *tport = container_of(wwn,
|
|
struct ibmvscsis_tport,
|
|
tport_wwn);
|
|
struct scsi_info *vscsi = container_of(tport, struct scsi_info, tport);
|
|
|
|
dev_dbg(&vscsi->dev, "drop_tport(%s)\n",
|
|
config_item_name(&tport->tport_wwn.wwn_group.cg_item));
|
|
}
|
|
|
|
static struct se_portal_group *ibmvscsis_make_tpg(struct se_wwn *wwn,
|
|
const char *name)
|
|
{
|
|
struct ibmvscsis_tport *tport =
|
|
container_of(wwn, struct ibmvscsis_tport, tport_wwn);
|
|
u16 tpgt;
|
|
int rc;
|
|
|
|
if (strstr(name, "tpgt_") != name)
|
|
return ERR_PTR(-EINVAL);
|
|
rc = kstrtou16(name + 5, 0, &tpgt);
|
|
if (rc)
|
|
return ERR_PTR(rc);
|
|
tport->tport_tpgt = tpgt;
|
|
|
|
tport->releasing = false;
|
|
|
|
rc = core_tpg_register(&tport->tport_wwn, &tport->se_tpg,
|
|
tport->tport_proto_id);
|
|
if (rc)
|
|
return ERR_PTR(rc);
|
|
|
|
return &tport->se_tpg;
|
|
}
|
|
|
|
static void ibmvscsis_drop_tpg(struct se_portal_group *se_tpg)
|
|
{
|
|
struct ibmvscsis_tport *tport = container_of(se_tpg,
|
|
struct ibmvscsis_tport,
|
|
se_tpg);
|
|
|
|
tport->releasing = true;
|
|
tport->enabled = false;
|
|
|
|
/*
|
|
* Release the virtual I_T Nexus for this ibmvscsis TPG
|
|
*/
|
|
ibmvscsis_drop_nexus(tport);
|
|
/*
|
|
* Deregister the se_tpg from TCM..
|
|
*/
|
|
core_tpg_deregister(se_tpg);
|
|
}
|
|
|
|
static ssize_t ibmvscsis_wwn_version_show(struct config_item *item,
|
|
char *page)
|
|
{
|
|
return scnprintf(page, PAGE_SIZE, "%s\n", IBMVSCSIS_VERSION);
|
|
}
|
|
CONFIGFS_ATTR_RO(ibmvscsis_wwn_, version);
|
|
|
|
static struct configfs_attribute *ibmvscsis_wwn_attrs[] = {
|
|
&ibmvscsis_wwn_attr_version,
|
|
NULL,
|
|
};
|
|
|
|
static ssize_t ibmvscsis_tpg_enable_show(struct config_item *item,
|
|
char *page)
|
|
{
|
|
struct se_portal_group *se_tpg = to_tpg(item);
|
|
struct ibmvscsis_tport *tport = container_of(se_tpg,
|
|
struct ibmvscsis_tport,
|
|
se_tpg);
|
|
|
|
return snprintf(page, PAGE_SIZE, "%d\n", (tport->enabled) ? 1 : 0);
|
|
}
|
|
|
|
static ssize_t ibmvscsis_tpg_enable_store(struct config_item *item,
|
|
const char *page, size_t count)
|
|
{
|
|
struct se_portal_group *se_tpg = to_tpg(item);
|
|
struct ibmvscsis_tport *tport = container_of(se_tpg,
|
|
struct ibmvscsis_tport,
|
|
se_tpg);
|
|
struct scsi_info *vscsi = container_of(tport, struct scsi_info, tport);
|
|
unsigned long tmp;
|
|
int rc;
|
|
long lrc;
|
|
|
|
rc = kstrtoul(page, 0, &tmp);
|
|
if (rc < 0) {
|
|
dev_err(&vscsi->dev, "Unable to extract srpt_tpg_store_enable\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if ((tmp != 0) && (tmp != 1)) {
|
|
dev_err(&vscsi->dev, "Illegal value for srpt_tpg_store_enable\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (tmp) {
|
|
spin_lock_bh(&vscsi->intr_lock);
|
|
tport->enabled = true;
|
|
lrc = ibmvscsis_enable_change_state(vscsi);
|
|
if (lrc)
|
|
dev_err(&vscsi->dev, "enable_change_state failed, rc %ld state %d\n",
|
|
lrc, vscsi->state);
|
|
spin_unlock_bh(&vscsi->intr_lock);
|
|
} else {
|
|
spin_lock_bh(&vscsi->intr_lock);
|
|
tport->enabled = false;
|
|
/* This simulates the server going down */
|
|
ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0);
|
|
spin_unlock_bh(&vscsi->intr_lock);
|
|
}
|
|
|
|
dev_dbg(&vscsi->dev, "tpg_enable_store, tmp %ld, state %d\n", tmp,
|
|
vscsi->state);
|
|
|
|
return count;
|
|
}
|
|
CONFIGFS_ATTR(ibmvscsis_tpg_, enable);
|
|
|
|
static struct configfs_attribute *ibmvscsis_tpg_attrs[] = {
|
|
&ibmvscsis_tpg_attr_enable,
|
|
NULL,
|
|
};
|
|
|
|
static const struct target_core_fabric_ops ibmvscsis_ops = {
|
|
.module = THIS_MODULE,
|
|
.fabric_name = "ibmvscsis",
|
|
.max_data_sg_nents = MAX_TXU / PAGE_SIZE,
|
|
.tpg_get_wwn = ibmvscsis_get_fabric_wwn,
|
|
.tpg_get_tag = ibmvscsis_get_tag,
|
|
.tpg_get_default_depth = ibmvscsis_get_default_depth,
|
|
.tpg_check_demo_mode = ibmvscsis_check_true,
|
|
.tpg_check_demo_mode_cache = ibmvscsis_check_true,
|
|
.tpg_check_demo_mode_write_protect = ibmvscsis_check_false,
|
|
.tpg_check_prod_mode_write_protect = ibmvscsis_check_false,
|
|
.tpg_get_inst_index = ibmvscsis_tpg_get_inst_index,
|
|
.check_stop_free = ibmvscsis_check_stop_free,
|
|
.release_cmd = ibmvscsis_release_cmd,
|
|
.sess_get_index = ibmvscsis_sess_get_index,
|
|
.write_pending = ibmvscsis_write_pending,
|
|
.set_default_node_attributes = ibmvscsis_set_default_node_attrs,
|
|
.get_cmd_state = ibmvscsis_get_cmd_state,
|
|
.queue_data_in = ibmvscsis_queue_data_in,
|
|
.queue_status = ibmvscsis_queue_status,
|
|
.queue_tm_rsp = ibmvscsis_queue_tm_rsp,
|
|
.aborted_task = ibmvscsis_aborted_task,
|
|
/*
|
|
* Setup function pointers for logic in target_core_fabric_configfs.c
|
|
*/
|
|
.fabric_make_wwn = ibmvscsis_make_tport,
|
|
.fabric_drop_wwn = ibmvscsis_drop_tport,
|
|
.fabric_make_tpg = ibmvscsis_make_tpg,
|
|
.fabric_drop_tpg = ibmvscsis_drop_tpg,
|
|
|
|
.tfc_wwn_attrs = ibmvscsis_wwn_attrs,
|
|
.tfc_tpg_base_attrs = ibmvscsis_tpg_attrs,
|
|
};
|
|
|
|
static void ibmvscsis_dev_release(struct device *dev) {};
|
|
|
|
static struct device_attribute dev_attr_system_id =
|
|
__ATTR(system_id, S_IRUGO, system_id_show, NULL);
|
|
|
|
static struct device_attribute dev_attr_partition_number =
|
|
__ATTR(partition_number, S_IRUGO, partition_number_show, NULL);
|
|
|
|
static struct device_attribute dev_attr_unit_address =
|
|
__ATTR(unit_address, S_IRUGO, unit_address_show, NULL);
|
|
|
|
static struct attribute *ibmvscsis_dev_attrs[] = {
|
|
&dev_attr_system_id.attr,
|
|
&dev_attr_partition_number.attr,
|
|
&dev_attr_unit_address.attr,
|
|
};
|
|
ATTRIBUTE_GROUPS(ibmvscsis_dev);
|
|
|
|
static struct class ibmvscsis_class = {
|
|
.name = "ibmvscsis",
|
|
.dev_release = ibmvscsis_dev_release,
|
|
.dev_groups = ibmvscsis_dev_groups,
|
|
};
|
|
|
|
static const struct vio_device_id ibmvscsis_device_table[] = {
|
|
{ "v-scsi-host", "IBM,v-scsi-host" },
|
|
{ "", "" }
|
|
};
|
|
MODULE_DEVICE_TABLE(vio, ibmvscsis_device_table);
|
|
|
|
static struct vio_driver ibmvscsis_driver = {
|
|
.name = "ibmvscsis",
|
|
.id_table = ibmvscsis_device_table,
|
|
.probe = ibmvscsis_probe,
|
|
.remove = ibmvscsis_remove,
|
|
};
|
|
|
|
/*
|
|
* ibmvscsis_init() - Kernel Module initialization
|
|
*
|
|
* Note: vio_register_driver() registers callback functions, and at least one
|
|
* of those callback functions calls TCM - Linux IO Target Subsystem, thus
|
|
* the SCSI Target template must be registered before vio_register_driver()
|
|
* is called.
|
|
*/
|
|
static int __init ibmvscsis_init(void)
|
|
{
|
|
int rc = 0;
|
|
|
|
rc = ibmvscsis_get_system_info();
|
|
if (rc) {
|
|
pr_err("rc %d from get_system_info\n", rc);
|
|
goto out;
|
|
}
|
|
|
|
rc = class_register(&ibmvscsis_class);
|
|
if (rc) {
|
|
pr_err("failed class register\n");
|
|
goto out;
|
|
}
|
|
|
|
rc = target_register_template(&ibmvscsis_ops);
|
|
if (rc) {
|
|
pr_err("rc %d from target_register_template\n", rc);
|
|
goto unregister_class;
|
|
}
|
|
|
|
rc = vio_register_driver(&ibmvscsis_driver);
|
|
if (rc) {
|
|
pr_err("rc %d from vio_register_driver\n", rc);
|
|
goto unregister_target;
|
|
}
|
|
|
|
return 0;
|
|
|
|
unregister_target:
|
|
target_unregister_template(&ibmvscsis_ops);
|
|
unregister_class:
|
|
class_unregister(&ibmvscsis_class);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static void __exit ibmvscsis_exit(void)
|
|
{
|
|
pr_info("Unregister IBM virtual SCSI host driver\n");
|
|
vio_unregister_driver(&ibmvscsis_driver);
|
|
target_unregister_template(&ibmvscsis_ops);
|
|
class_unregister(&ibmvscsis_class);
|
|
}
|
|
|
|
MODULE_DESCRIPTION("IBMVSCSIS fabric driver");
|
|
MODULE_AUTHOR("Bryant G. Ly and Michael Cyr");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_VERSION(IBMVSCSIS_VERSION);
|
|
module_init(ibmvscsis_init);
|
|
module_exit(ibmvscsis_exit);
|