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65be2c79ac
Add superpipe supporting infrastructure to device driver for the IBM CXL Flash adapter. This patch allows userspace applications to take advantage of the accelerated I/O features that this adapter provides and bypass the traditional filesystem stack. Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Manoj N. Kumar <manoj@linux.vnet.ibm.com> Reviewed-by: Michael Neuling <mikey@neuling.org> Reviewed-by: Wen Xiong <wenxiong@linux.vnet.ibm.com> Reviewed-by: Brian King <brking@linux.vnet.ibm.com> Signed-off-by: James Bottomley <JBottomley@Odin.com>
263 lines
6.8 KiB
C
263 lines
6.8 KiB
C
/*
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* CXL Flash Device Driver
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*
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* Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation
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* Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation
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*
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* Copyright (C) 2015 IBM Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <misc/cxl.h>
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#include <asm/unaligned.h>
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#include <scsi/scsi_host.h>
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#include <uapi/scsi/cxlflash_ioctl.h>
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#include "sislite.h"
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#include "common.h"
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#include "superpipe.h"
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/**
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* create_local() - allocate and initialize a local LUN information structure
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* @sdev: SCSI device associated with LUN.
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* @wwid: World Wide Node Name for LUN.
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*
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* Return: Allocated local llun_info structure on success, NULL on failure
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*/
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static struct llun_info *create_local(struct scsi_device *sdev, u8 *wwid)
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{
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struct llun_info *lli = NULL;
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lli = kzalloc(sizeof(*lli), GFP_KERNEL);
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if (unlikely(!lli)) {
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pr_err("%s: could not allocate lli\n", __func__);
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goto out;
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}
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lli->sdev = sdev;
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lli->newly_created = true;
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lli->host_no = sdev->host->host_no;
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memcpy(lli->wwid, wwid, DK_CXLFLASH_MANAGE_LUN_WWID_LEN);
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out:
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return lli;
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}
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/**
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* create_global() - allocate and initialize a global LUN information structure
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* @sdev: SCSI device associated with LUN.
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* @wwid: World Wide Node Name for LUN.
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*
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* Return: Allocated global glun_info structure on success, NULL on failure
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*/
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static struct glun_info *create_global(struct scsi_device *sdev, u8 *wwid)
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{
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struct glun_info *gli = NULL;
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gli = kzalloc(sizeof(*gli), GFP_KERNEL);
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if (unlikely(!gli)) {
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pr_err("%s: could not allocate gli\n", __func__);
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goto out;
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}
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mutex_init(&gli->mutex);
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memcpy(gli->wwid, wwid, DK_CXLFLASH_MANAGE_LUN_WWID_LEN);
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out:
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return gli;
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}
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/**
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* refresh_local() - find and update local LUN information structure by WWID
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* @cfg: Internal structure associated with the host.
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* @wwid: WWID associated with LUN.
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*
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* When the LUN is found, mark it by updating it's newly_created field.
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*
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* Return: Found local lun_info structure on success, NULL on failure
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* If a LUN with the WWID is found in the list, refresh it's state.
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*/
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static struct llun_info *refresh_local(struct cxlflash_cfg *cfg, u8 *wwid)
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{
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struct llun_info *lli, *temp;
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list_for_each_entry_safe(lli, temp, &cfg->lluns, list)
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if (!memcmp(lli->wwid, wwid, DK_CXLFLASH_MANAGE_LUN_WWID_LEN)) {
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lli->newly_created = false;
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return lli;
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}
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return NULL;
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}
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/**
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* lookup_global() - find a global LUN information structure by WWID
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* @wwid: WWID associated with LUN.
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*
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* Return: Found global lun_info structure on success, NULL on failure
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*/
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static struct glun_info *lookup_global(u8 *wwid)
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{
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struct glun_info *gli, *temp;
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list_for_each_entry_safe(gli, temp, &global.gluns, list)
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if (!memcmp(gli->wwid, wwid, DK_CXLFLASH_MANAGE_LUN_WWID_LEN))
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return gli;
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return NULL;
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}
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/**
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* find_and_create_lun() - find or create a local LUN information structure
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* @sdev: SCSI device associated with LUN.
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* @wwid: WWID associated with LUN.
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*
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* The LUN is kept both in a local list (per adapter) and in a global list
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* (across all adapters). Certain attributes of the LUN are local to the
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* adapter (such as index, port selection mask etc.).
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* The block allocation map is shared across all adapters (i.e. associated
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* wih the global list). Since different attributes are associated with
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* the per adapter and global entries, allocate two separate structures for each
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* LUN (one local, one global).
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*
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* Keep a pointer back from the local to the global entry.
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*
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* Return: Found/Allocated local lun_info structure on success, NULL on failure
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*/
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static struct llun_info *find_and_create_lun(struct scsi_device *sdev, u8 *wwid)
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{
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struct llun_info *lli = NULL;
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struct glun_info *gli = NULL;
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struct Scsi_Host *shost = sdev->host;
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struct cxlflash_cfg *cfg = shost_priv(shost);
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mutex_lock(&global.mutex);
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if (unlikely(!wwid))
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goto out;
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lli = refresh_local(cfg, wwid);
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if (lli)
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goto out;
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lli = create_local(sdev, wwid);
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if (unlikely(!lli))
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goto out;
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gli = lookup_global(wwid);
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if (gli) {
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lli->parent = gli;
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list_add(&lli->list, &cfg->lluns);
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goto out;
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}
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gli = create_global(sdev, wwid);
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if (unlikely(!gli)) {
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kfree(lli);
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lli = NULL;
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goto out;
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}
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lli->parent = gli;
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list_add(&lli->list, &cfg->lluns);
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list_add(&gli->list, &global.gluns);
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out:
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mutex_unlock(&global.mutex);
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pr_debug("%s: returning %p\n", __func__, lli);
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return lli;
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}
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/**
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* cxlflash_term_local_luns() - Delete all entries from local LUN list, free.
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* @cfg: Internal structure associated with the host.
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*/
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void cxlflash_term_local_luns(struct cxlflash_cfg *cfg)
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{
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struct llun_info *lli, *temp;
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mutex_lock(&global.mutex);
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list_for_each_entry_safe(lli, temp, &cfg->lluns, list) {
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list_del(&lli->list);
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kfree(lli);
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}
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mutex_unlock(&global.mutex);
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}
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/**
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* cxlflash_list_init() - initializes the global LUN list
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*/
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void cxlflash_list_init(void)
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{
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INIT_LIST_HEAD(&global.gluns);
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mutex_init(&global.mutex);
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global.err_page = NULL;
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}
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/**
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* cxlflash_term_global_luns() - frees resources associated with global LUN list
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*/
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void cxlflash_term_global_luns(void)
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{
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struct glun_info *gli, *temp;
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mutex_lock(&global.mutex);
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list_for_each_entry_safe(gli, temp, &global.gluns, list) {
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list_del(&gli->list);
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kfree(gli);
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}
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mutex_unlock(&global.mutex);
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}
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/**
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* cxlflash_manage_lun() - handles LUN management activities
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* @sdev: SCSI device associated with LUN.
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* @manage: Manage ioctl data structure.
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*
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* This routine is used to notify the driver about a LUN's WWID and associate
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* SCSI devices (sdev) with a global LUN instance. Additionally it serves to
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* change a LUN's operating mode: legacy or superpipe.
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*
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* Return: 0 on success, -errno on failure
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*/
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int cxlflash_manage_lun(struct scsi_device *sdev,
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struct dk_cxlflash_manage_lun *manage)
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{
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int rc = 0;
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struct llun_info *lli = NULL;
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u64 flags = manage->hdr.flags;
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u32 chan = sdev->channel;
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lli = find_and_create_lun(sdev, manage->wwid);
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pr_debug("%s: ENTER: WWID = %016llX%016llX, flags = %016llX li = %p\n",
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__func__, get_unaligned_le64(&manage->wwid[0]),
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get_unaligned_le64(&manage->wwid[8]),
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manage->hdr.flags, lli);
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if (unlikely(!lli)) {
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rc = -ENOMEM;
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goto out;
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}
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if (flags & DK_CXLFLASH_MANAGE_LUN_ENABLE_SUPERPIPE) {
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if (lli->newly_created)
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lli->port_sel = CHAN2PORT(chan);
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else
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lli->port_sel = BOTH_PORTS;
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/* Store off lun in unpacked, AFU-friendly format */
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lli->lun_id[chan] = lun_to_lunid(sdev->lun);
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sdev->hostdata = lli;
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} else if (flags & DK_CXLFLASH_MANAGE_LUN_DISABLE_SUPERPIPE) {
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if (lli->parent->mode != MODE_NONE)
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rc = -EBUSY;
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else
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sdev->hostdata = NULL;
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}
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out:
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pr_debug("%s: returning rc=%d\n", __func__, rc);
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return rc;
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}
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