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![Harald Freudenberger](/assets/img/avatar_default.png)
Until now there is no way to reset a AP queue or card. Driving a card or queue offline and online again does only toggle the 'software' online state. The only way to trigger a (hardware) reset is by running hot-unplug/hot-plug for example on the HMC. This patch makes the queue reset attribute in sysfs writable. Writing into this attribute triggers a reset on the AP queue's state machine. So the AP queue is flushed and state machine runs through the initial states which cause a reset (PQAP(RAPQ)) and a re-registration to interrupts (PQAP(AQIC)) if available. The reset sysfs attribute is writable by root only. So only an administrator is allowed to initiate a reset of AP queues. Please note that the queue's counter values are left untouched by the reset. Signed-off-by: Harald Freudenberger <freude@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
758 lines
19 KiB
C
758 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright IBM Corp. 2016
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* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
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*
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* Adjunct processor bus, queue related code.
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*/
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#define KMSG_COMPONENT "ap"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <asm/facility.h>
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#include "ap_bus.h"
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#include "ap_debug.h"
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static void __ap_flush_queue(struct ap_queue *aq);
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/**
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* ap_queue_enable_interruption(): Enable interruption on an AP queue.
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* @qid: The AP queue number
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* @ind: the notification indicator byte
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*
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* Enables interruption on AP queue via ap_aqic(). Based on the return
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* value it waits a while and tests the AP queue if interrupts
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* have been switched on using ap_test_queue().
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*/
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static int ap_queue_enable_interruption(struct ap_queue *aq, void *ind)
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{
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struct ap_queue_status status;
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struct ap_qirq_ctrl qirqctrl = { 0 };
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qirqctrl.ir = 1;
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qirqctrl.isc = AP_ISC;
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status = ap_aqic(aq->qid, qirqctrl, ind);
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switch (status.response_code) {
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case AP_RESPONSE_NORMAL:
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case AP_RESPONSE_OTHERWISE_CHANGED:
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return 0;
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case AP_RESPONSE_Q_NOT_AVAIL:
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case AP_RESPONSE_DECONFIGURED:
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case AP_RESPONSE_CHECKSTOPPED:
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case AP_RESPONSE_INVALID_ADDRESS:
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pr_err("Registering adapter interrupts for AP device %02x.%04x failed\n",
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AP_QID_CARD(aq->qid),
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AP_QID_QUEUE(aq->qid));
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return -EOPNOTSUPP;
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case AP_RESPONSE_RESET_IN_PROGRESS:
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case AP_RESPONSE_BUSY:
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default:
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return -EBUSY;
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}
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}
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/**
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* __ap_send(): Send message to adjunct processor queue.
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* @qid: The AP queue number
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* @psmid: The program supplied message identifier
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* @msg: The message text
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* @length: The message length
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* @special: Special Bit
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*
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* Returns AP queue status structure.
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* Condition code 1 on NQAP can't happen because the L bit is 1.
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* Condition code 2 on NQAP also means the send is incomplete,
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* because a segment boundary was reached. The NQAP is repeated.
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*/
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static inline struct ap_queue_status
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__ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length,
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unsigned int special)
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{
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if (special == 1)
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qid |= 0x400000UL;
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return ap_nqap(qid, psmid, msg, length);
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}
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int ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length)
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{
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struct ap_queue_status status;
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status = __ap_send(qid, psmid, msg, length, 0);
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switch (status.response_code) {
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case AP_RESPONSE_NORMAL:
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return 0;
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case AP_RESPONSE_Q_FULL:
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case AP_RESPONSE_RESET_IN_PROGRESS:
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return -EBUSY;
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case AP_RESPONSE_REQ_FAC_NOT_INST:
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return -EINVAL;
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default: /* Device is gone. */
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return -ENODEV;
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}
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}
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EXPORT_SYMBOL(ap_send);
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int ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length)
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{
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struct ap_queue_status status;
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if (msg == NULL)
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return -EINVAL;
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status = ap_dqap(qid, psmid, msg, length);
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switch (status.response_code) {
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case AP_RESPONSE_NORMAL:
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return 0;
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case AP_RESPONSE_NO_PENDING_REPLY:
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if (status.queue_empty)
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return -ENOENT;
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return -EBUSY;
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case AP_RESPONSE_RESET_IN_PROGRESS:
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return -EBUSY;
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default:
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return -ENODEV;
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}
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}
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EXPORT_SYMBOL(ap_recv);
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/* State machine definitions and helpers */
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static enum ap_wait ap_sm_nop(struct ap_queue *aq)
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{
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return AP_WAIT_NONE;
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}
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/**
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* ap_sm_recv(): Receive pending reply messages from an AP queue but do
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* not change the state of the device.
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* @aq: pointer to the AP queue
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*
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* Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT
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*/
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static struct ap_queue_status ap_sm_recv(struct ap_queue *aq)
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{
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struct ap_queue_status status;
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struct ap_message *ap_msg;
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status = ap_dqap(aq->qid, &aq->reply->psmid,
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aq->reply->message, aq->reply->length);
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switch (status.response_code) {
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case AP_RESPONSE_NORMAL:
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aq->queue_count--;
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if (aq->queue_count > 0)
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mod_timer(&aq->timeout,
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jiffies + aq->request_timeout);
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list_for_each_entry(ap_msg, &aq->pendingq, list) {
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if (ap_msg->psmid != aq->reply->psmid)
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continue;
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list_del_init(&ap_msg->list);
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aq->pendingq_count--;
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ap_msg->receive(aq, ap_msg, aq->reply);
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break;
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}
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case AP_RESPONSE_NO_PENDING_REPLY:
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if (!status.queue_empty || aq->queue_count <= 0)
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break;
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/* The card shouldn't forget requests but who knows. */
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aq->queue_count = 0;
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list_splice_init(&aq->pendingq, &aq->requestq);
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aq->requestq_count += aq->pendingq_count;
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aq->pendingq_count = 0;
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break;
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default:
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break;
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}
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return status;
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}
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/**
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* ap_sm_read(): Receive pending reply messages from an AP queue.
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* @aq: pointer to the AP queue
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*
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* Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT
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*/
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static enum ap_wait ap_sm_read(struct ap_queue *aq)
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{
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struct ap_queue_status status;
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if (!aq->reply)
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return AP_WAIT_NONE;
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status = ap_sm_recv(aq);
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switch (status.response_code) {
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case AP_RESPONSE_NORMAL:
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if (aq->queue_count > 0) {
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aq->state = AP_STATE_WORKING;
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return AP_WAIT_AGAIN;
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}
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aq->state = AP_STATE_IDLE;
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return AP_WAIT_NONE;
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case AP_RESPONSE_NO_PENDING_REPLY:
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if (aq->queue_count > 0)
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return AP_WAIT_INTERRUPT;
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aq->state = AP_STATE_IDLE;
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return AP_WAIT_NONE;
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default:
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aq->state = AP_STATE_BORKED;
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return AP_WAIT_NONE;
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}
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}
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/**
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* ap_sm_suspend_read(): Receive pending reply messages from an AP queue
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* without changing the device state in between. In suspend mode we don't
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* allow sending new requests, therefore just fetch pending replies.
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* @aq: pointer to the AP queue
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*
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* Returns AP_WAIT_NONE or AP_WAIT_AGAIN
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*/
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static enum ap_wait ap_sm_suspend_read(struct ap_queue *aq)
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{
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struct ap_queue_status status;
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if (!aq->reply)
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return AP_WAIT_NONE;
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status = ap_sm_recv(aq);
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switch (status.response_code) {
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case AP_RESPONSE_NORMAL:
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if (aq->queue_count > 0)
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return AP_WAIT_AGAIN;
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/* fall through */
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default:
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return AP_WAIT_NONE;
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}
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}
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/**
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* ap_sm_write(): Send messages from the request queue to an AP queue.
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* @aq: pointer to the AP queue
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*
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* Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT
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*/
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static enum ap_wait ap_sm_write(struct ap_queue *aq)
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{
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struct ap_queue_status status;
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struct ap_message *ap_msg;
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if (aq->requestq_count <= 0)
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return AP_WAIT_NONE;
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/* Start the next request on the queue. */
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ap_msg = list_entry(aq->requestq.next, struct ap_message, list);
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status = __ap_send(aq->qid, ap_msg->psmid,
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ap_msg->message, ap_msg->length, ap_msg->special);
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switch (status.response_code) {
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case AP_RESPONSE_NORMAL:
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aq->queue_count++;
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if (aq->queue_count == 1)
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mod_timer(&aq->timeout, jiffies + aq->request_timeout);
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list_move_tail(&ap_msg->list, &aq->pendingq);
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aq->requestq_count--;
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aq->pendingq_count++;
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if (aq->queue_count < aq->card->queue_depth) {
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aq->state = AP_STATE_WORKING;
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return AP_WAIT_AGAIN;
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}
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/* fall through */
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case AP_RESPONSE_Q_FULL:
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aq->state = AP_STATE_QUEUE_FULL;
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return AP_WAIT_INTERRUPT;
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case AP_RESPONSE_RESET_IN_PROGRESS:
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aq->state = AP_STATE_RESET_WAIT;
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return AP_WAIT_TIMEOUT;
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case AP_RESPONSE_MESSAGE_TOO_BIG:
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case AP_RESPONSE_REQ_FAC_NOT_INST:
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list_del_init(&ap_msg->list);
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aq->requestq_count--;
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ap_msg->rc = -EINVAL;
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ap_msg->receive(aq, ap_msg, NULL);
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return AP_WAIT_AGAIN;
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default:
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aq->state = AP_STATE_BORKED;
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return AP_WAIT_NONE;
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}
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}
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/**
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* ap_sm_read_write(): Send and receive messages to/from an AP queue.
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* @aq: pointer to the AP queue
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*
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* Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT
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*/
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static enum ap_wait ap_sm_read_write(struct ap_queue *aq)
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{
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return min(ap_sm_read(aq), ap_sm_write(aq));
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}
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/**
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* ap_sm_reset(): Reset an AP queue.
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* @qid: The AP queue number
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*
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* Submit the Reset command to an AP queue.
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*/
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static enum ap_wait ap_sm_reset(struct ap_queue *aq)
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{
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struct ap_queue_status status;
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status = ap_rapq(aq->qid);
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switch (status.response_code) {
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case AP_RESPONSE_NORMAL:
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case AP_RESPONSE_RESET_IN_PROGRESS:
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aq->state = AP_STATE_RESET_WAIT;
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aq->interrupt = AP_INTR_DISABLED;
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return AP_WAIT_TIMEOUT;
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case AP_RESPONSE_BUSY:
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return AP_WAIT_TIMEOUT;
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case AP_RESPONSE_Q_NOT_AVAIL:
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case AP_RESPONSE_DECONFIGURED:
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case AP_RESPONSE_CHECKSTOPPED:
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default:
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aq->state = AP_STATE_BORKED;
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return AP_WAIT_NONE;
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}
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}
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/**
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* ap_sm_reset_wait(): Test queue for completion of the reset operation
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* @aq: pointer to the AP queue
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*
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* Returns AP_POLL_IMMEDIATELY, AP_POLL_AFTER_TIMEROUT or 0.
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*/
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static enum ap_wait ap_sm_reset_wait(struct ap_queue *aq)
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{
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struct ap_queue_status status;
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void *lsi_ptr;
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if (aq->queue_count > 0 && aq->reply)
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/* Try to read a completed message and get the status */
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status = ap_sm_recv(aq);
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else
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/* Get the status with TAPQ */
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status = ap_tapq(aq->qid, NULL);
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switch (status.response_code) {
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case AP_RESPONSE_NORMAL:
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lsi_ptr = ap_airq_ptr();
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if (lsi_ptr && ap_queue_enable_interruption(aq, lsi_ptr) == 0)
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aq->state = AP_STATE_SETIRQ_WAIT;
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else
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aq->state = (aq->queue_count > 0) ?
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AP_STATE_WORKING : AP_STATE_IDLE;
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return AP_WAIT_AGAIN;
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case AP_RESPONSE_BUSY:
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case AP_RESPONSE_RESET_IN_PROGRESS:
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return AP_WAIT_TIMEOUT;
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case AP_RESPONSE_Q_NOT_AVAIL:
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case AP_RESPONSE_DECONFIGURED:
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case AP_RESPONSE_CHECKSTOPPED:
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default:
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aq->state = AP_STATE_BORKED;
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return AP_WAIT_NONE;
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}
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}
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/**
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* ap_sm_setirq_wait(): Test queue for completion of the irq enablement
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* @aq: pointer to the AP queue
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*
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* Returns AP_POLL_IMMEDIATELY, AP_POLL_AFTER_TIMEROUT or 0.
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*/
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static enum ap_wait ap_sm_setirq_wait(struct ap_queue *aq)
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{
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struct ap_queue_status status;
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if (aq->queue_count > 0 && aq->reply)
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/* Try to read a completed message and get the status */
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status = ap_sm_recv(aq);
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else
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/* Get the status with TAPQ */
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status = ap_tapq(aq->qid, NULL);
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if (status.irq_enabled == 1) {
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/* Irqs are now enabled */
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aq->interrupt = AP_INTR_ENABLED;
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aq->state = (aq->queue_count > 0) ?
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AP_STATE_WORKING : AP_STATE_IDLE;
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}
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switch (status.response_code) {
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case AP_RESPONSE_NORMAL:
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if (aq->queue_count > 0)
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return AP_WAIT_AGAIN;
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/* fallthrough */
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case AP_RESPONSE_NO_PENDING_REPLY:
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return AP_WAIT_TIMEOUT;
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default:
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aq->state = AP_STATE_BORKED;
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return AP_WAIT_NONE;
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}
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}
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/*
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* AP state machine jump table
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*/
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static ap_func_t *ap_jumptable[NR_AP_STATES][NR_AP_EVENTS] = {
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[AP_STATE_RESET_START] = {
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[AP_EVENT_POLL] = ap_sm_reset,
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[AP_EVENT_TIMEOUT] = ap_sm_nop,
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},
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[AP_STATE_RESET_WAIT] = {
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[AP_EVENT_POLL] = ap_sm_reset_wait,
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[AP_EVENT_TIMEOUT] = ap_sm_nop,
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},
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[AP_STATE_SETIRQ_WAIT] = {
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[AP_EVENT_POLL] = ap_sm_setirq_wait,
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[AP_EVENT_TIMEOUT] = ap_sm_nop,
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},
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[AP_STATE_IDLE] = {
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[AP_EVENT_POLL] = ap_sm_write,
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[AP_EVENT_TIMEOUT] = ap_sm_nop,
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},
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[AP_STATE_WORKING] = {
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[AP_EVENT_POLL] = ap_sm_read_write,
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[AP_EVENT_TIMEOUT] = ap_sm_reset,
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},
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[AP_STATE_QUEUE_FULL] = {
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[AP_EVENT_POLL] = ap_sm_read,
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[AP_EVENT_TIMEOUT] = ap_sm_reset,
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},
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[AP_STATE_SUSPEND_WAIT] = {
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[AP_EVENT_POLL] = ap_sm_suspend_read,
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[AP_EVENT_TIMEOUT] = ap_sm_nop,
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},
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[AP_STATE_BORKED] = {
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[AP_EVENT_POLL] = ap_sm_nop,
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[AP_EVENT_TIMEOUT] = ap_sm_nop,
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},
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};
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enum ap_wait ap_sm_event(struct ap_queue *aq, enum ap_event event)
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{
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return ap_jumptable[aq->state][event](aq);
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}
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enum ap_wait ap_sm_event_loop(struct ap_queue *aq, enum ap_event event)
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{
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enum ap_wait wait;
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while ((wait = ap_sm_event(aq, event)) == AP_WAIT_AGAIN)
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;
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return wait;
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}
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/*
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* Power management for queue devices
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*/
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void ap_queue_suspend(struct ap_device *ap_dev)
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{
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struct ap_queue *aq = to_ap_queue(&ap_dev->device);
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/* Poll on the device until all requests are finished. */
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spin_lock_bh(&aq->lock);
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aq->state = AP_STATE_SUSPEND_WAIT;
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while (ap_sm_event(aq, AP_EVENT_POLL) != AP_WAIT_NONE)
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;
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aq->state = AP_STATE_BORKED;
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spin_unlock_bh(&aq->lock);
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}
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EXPORT_SYMBOL(ap_queue_suspend);
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void ap_queue_resume(struct ap_device *ap_dev)
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{
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}
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EXPORT_SYMBOL(ap_queue_resume);
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/*
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* AP queue related attributes.
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*/
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static ssize_t request_count_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct ap_queue *aq = to_ap_queue(dev);
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unsigned int req_cnt;
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spin_lock_bh(&aq->lock);
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req_cnt = aq->total_request_count;
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spin_unlock_bh(&aq->lock);
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return snprintf(buf, PAGE_SIZE, "%d\n", req_cnt);
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}
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static ssize_t request_count_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
|
|
{
|
|
struct ap_queue *aq = to_ap_queue(dev);
|
|
|
|
spin_lock_bh(&aq->lock);
|
|
aq->total_request_count = 0;
|
|
spin_unlock_bh(&aq->lock);
|
|
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR_RW(request_count);
|
|
|
|
static ssize_t requestq_count_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct ap_queue *aq = to_ap_queue(dev);
|
|
unsigned int reqq_cnt = 0;
|
|
|
|
spin_lock_bh(&aq->lock);
|
|
reqq_cnt = aq->requestq_count;
|
|
spin_unlock_bh(&aq->lock);
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", reqq_cnt);
|
|
}
|
|
|
|
static DEVICE_ATTR_RO(requestq_count);
|
|
|
|
static ssize_t pendingq_count_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct ap_queue *aq = to_ap_queue(dev);
|
|
unsigned int penq_cnt = 0;
|
|
|
|
spin_lock_bh(&aq->lock);
|
|
penq_cnt = aq->pendingq_count;
|
|
spin_unlock_bh(&aq->lock);
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", penq_cnt);
|
|
}
|
|
|
|
static DEVICE_ATTR_RO(pendingq_count);
|
|
|
|
static ssize_t reset_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct ap_queue *aq = to_ap_queue(dev);
|
|
int rc = 0;
|
|
|
|
spin_lock_bh(&aq->lock);
|
|
switch (aq->state) {
|
|
case AP_STATE_RESET_START:
|
|
case AP_STATE_RESET_WAIT:
|
|
rc = snprintf(buf, PAGE_SIZE, "Reset in progress.\n");
|
|
break;
|
|
case AP_STATE_WORKING:
|
|
case AP_STATE_QUEUE_FULL:
|
|
rc = snprintf(buf, PAGE_SIZE, "Reset Timer armed.\n");
|
|
break;
|
|
default:
|
|
rc = snprintf(buf, PAGE_SIZE, "No Reset Timer set.\n");
|
|
}
|
|
spin_unlock_bh(&aq->lock);
|
|
return rc;
|
|
}
|
|
|
|
static ssize_t reset_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct ap_queue *aq = to_ap_queue(dev);
|
|
|
|
spin_lock_bh(&aq->lock);
|
|
__ap_flush_queue(aq);
|
|
aq->state = AP_STATE_RESET_START;
|
|
ap_wait(ap_sm_event(aq, AP_EVENT_POLL));
|
|
spin_unlock_bh(&aq->lock);
|
|
|
|
AP_DBF(DBF_INFO, "reset queue=%02x.%04x triggered by user\n",
|
|
AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid));
|
|
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR_RW(reset);
|
|
|
|
static ssize_t interrupt_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct ap_queue *aq = to_ap_queue(dev);
|
|
int rc = 0;
|
|
|
|
spin_lock_bh(&aq->lock);
|
|
if (aq->state == AP_STATE_SETIRQ_WAIT)
|
|
rc = snprintf(buf, PAGE_SIZE, "Enable Interrupt pending.\n");
|
|
else if (aq->interrupt == AP_INTR_ENABLED)
|
|
rc = snprintf(buf, PAGE_SIZE, "Interrupts enabled.\n");
|
|
else
|
|
rc = snprintf(buf, PAGE_SIZE, "Interrupts disabled.\n");
|
|
spin_unlock_bh(&aq->lock);
|
|
return rc;
|
|
}
|
|
|
|
static DEVICE_ATTR_RO(interrupt);
|
|
|
|
static struct attribute *ap_queue_dev_attrs[] = {
|
|
&dev_attr_request_count.attr,
|
|
&dev_attr_requestq_count.attr,
|
|
&dev_attr_pendingq_count.attr,
|
|
&dev_attr_reset.attr,
|
|
&dev_attr_interrupt.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct attribute_group ap_queue_dev_attr_group = {
|
|
.attrs = ap_queue_dev_attrs
|
|
};
|
|
|
|
static const struct attribute_group *ap_queue_dev_attr_groups[] = {
|
|
&ap_queue_dev_attr_group,
|
|
NULL
|
|
};
|
|
|
|
static struct device_type ap_queue_type = {
|
|
.name = "ap_queue",
|
|
.groups = ap_queue_dev_attr_groups,
|
|
};
|
|
|
|
static void ap_queue_device_release(struct device *dev)
|
|
{
|
|
struct ap_queue *aq = to_ap_queue(dev);
|
|
|
|
if (!list_empty(&aq->list)) {
|
|
spin_lock_bh(&ap_list_lock);
|
|
list_del_init(&aq->list);
|
|
spin_unlock_bh(&ap_list_lock);
|
|
}
|
|
kfree(aq);
|
|
}
|
|
|
|
struct ap_queue *ap_queue_create(ap_qid_t qid, int device_type)
|
|
{
|
|
struct ap_queue *aq;
|
|
|
|
aq = kzalloc(sizeof(*aq), GFP_KERNEL);
|
|
if (!aq)
|
|
return NULL;
|
|
aq->ap_dev.device.release = ap_queue_device_release;
|
|
aq->ap_dev.device.type = &ap_queue_type;
|
|
aq->ap_dev.device_type = device_type;
|
|
aq->qid = qid;
|
|
aq->state = AP_STATE_RESET_START;
|
|
aq->interrupt = AP_INTR_DISABLED;
|
|
spin_lock_init(&aq->lock);
|
|
INIT_LIST_HEAD(&aq->list);
|
|
INIT_LIST_HEAD(&aq->pendingq);
|
|
INIT_LIST_HEAD(&aq->requestq);
|
|
timer_setup(&aq->timeout, ap_request_timeout, 0);
|
|
|
|
return aq;
|
|
}
|
|
|
|
void ap_queue_init_reply(struct ap_queue *aq, struct ap_message *reply)
|
|
{
|
|
aq->reply = reply;
|
|
|
|
spin_lock_bh(&aq->lock);
|
|
ap_wait(ap_sm_event(aq, AP_EVENT_POLL));
|
|
spin_unlock_bh(&aq->lock);
|
|
}
|
|
EXPORT_SYMBOL(ap_queue_init_reply);
|
|
|
|
/**
|
|
* ap_queue_message(): Queue a request to an AP device.
|
|
* @aq: The AP device to queue the message to
|
|
* @ap_msg: The message that is to be added
|
|
*/
|
|
void ap_queue_message(struct ap_queue *aq, struct ap_message *ap_msg)
|
|
{
|
|
/* For asynchronous message handling a valid receive-callback
|
|
* is required.
|
|
*/
|
|
BUG_ON(!ap_msg->receive);
|
|
|
|
spin_lock_bh(&aq->lock);
|
|
/* Queue the message. */
|
|
list_add_tail(&ap_msg->list, &aq->requestq);
|
|
aq->requestq_count++;
|
|
aq->total_request_count++;
|
|
atomic_inc(&aq->card->total_request_count);
|
|
/* Send/receive as many request from the queue as possible. */
|
|
ap_wait(ap_sm_event_loop(aq, AP_EVENT_POLL));
|
|
spin_unlock_bh(&aq->lock);
|
|
}
|
|
EXPORT_SYMBOL(ap_queue_message);
|
|
|
|
/**
|
|
* ap_cancel_message(): Cancel a crypto request.
|
|
* @aq: The AP device that has the message queued
|
|
* @ap_msg: The message that is to be removed
|
|
*
|
|
* Cancel a crypto request. This is done by removing the request
|
|
* from the device pending or request queue. Note that the
|
|
* request stays on the AP queue. When it finishes the message
|
|
* reply will be discarded because the psmid can't be found.
|
|
*/
|
|
void ap_cancel_message(struct ap_queue *aq, struct ap_message *ap_msg)
|
|
{
|
|
struct ap_message *tmp;
|
|
|
|
spin_lock_bh(&aq->lock);
|
|
if (!list_empty(&ap_msg->list)) {
|
|
list_for_each_entry(tmp, &aq->pendingq, list)
|
|
if (tmp->psmid == ap_msg->psmid) {
|
|
aq->pendingq_count--;
|
|
goto found;
|
|
}
|
|
aq->requestq_count--;
|
|
found:
|
|
list_del_init(&ap_msg->list);
|
|
}
|
|
spin_unlock_bh(&aq->lock);
|
|
}
|
|
EXPORT_SYMBOL(ap_cancel_message);
|
|
|
|
/**
|
|
* __ap_flush_queue(): Flush requests.
|
|
* @aq: Pointer to the AP queue
|
|
*
|
|
* Flush all requests from the request/pending queue of an AP device.
|
|
*/
|
|
static void __ap_flush_queue(struct ap_queue *aq)
|
|
{
|
|
struct ap_message *ap_msg, *next;
|
|
|
|
list_for_each_entry_safe(ap_msg, next, &aq->pendingq, list) {
|
|
list_del_init(&ap_msg->list);
|
|
aq->pendingq_count--;
|
|
ap_msg->rc = -EAGAIN;
|
|
ap_msg->receive(aq, ap_msg, NULL);
|
|
}
|
|
list_for_each_entry_safe(ap_msg, next, &aq->requestq, list) {
|
|
list_del_init(&ap_msg->list);
|
|
aq->requestq_count--;
|
|
ap_msg->rc = -EAGAIN;
|
|
ap_msg->receive(aq, ap_msg, NULL);
|
|
}
|
|
}
|
|
|
|
void ap_flush_queue(struct ap_queue *aq)
|
|
{
|
|
spin_lock_bh(&aq->lock);
|
|
__ap_flush_queue(aq);
|
|
spin_unlock_bh(&aq->lock);
|
|
}
|
|
EXPORT_SYMBOL(ap_flush_queue);
|
|
|
|
void ap_queue_remove(struct ap_queue *aq)
|
|
{
|
|
ap_flush_queue(aq);
|
|
del_timer_sync(&aq->timeout);
|
|
|
|
/* reset with zero, also clears irq registration */
|
|
spin_lock_bh(&aq->lock);
|
|
ap_zapq(aq->qid);
|
|
aq->state = AP_STATE_BORKED;
|
|
spin_unlock_bh(&aq->lock);
|
|
}
|
|
EXPORT_SYMBOL(ap_queue_remove);
|
|
|
|
void ap_queue_reinit_state(struct ap_queue *aq)
|
|
{
|
|
spin_lock_bh(&aq->lock);
|
|
aq->state = AP_STATE_RESET_START;
|
|
ap_wait(ap_sm_event(aq, AP_EVENT_POLL));
|
|
spin_unlock_bh(&aq->lock);
|
|
}
|
|
EXPORT_SYMBOL(ap_queue_reinit_state);
|