mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 10:32:35 +00:00
32aaeffbd4
* 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux: (230 commits) Revert "tracing: Include module.h in define_trace.h" irq: don't put module.h into irq.h for tracking irqgen modules. bluetooth: macroize two small inlines to avoid module.h ip_vs.h: fix implicit use of module_get/module_put from module.h nf_conntrack.h: fix up fallout from implicit moduleparam.h presence include: replace linux/module.h with "struct module" wherever possible include: convert various register fcns to macros to avoid include chaining crypto.h: remove unused crypto_tfm_alg_modname() inline uwb.h: fix implicit use of asm/page.h for PAGE_SIZE pm_runtime.h: explicitly requires notifier.h linux/dmaengine.h: fix implicit use of bitmap.h and asm/page.h miscdevice.h: fix up implicit use of lists and types stop_machine.h: fix implicit use of smp.h for smp_processor_id of: fix implicit use of errno.h in include/linux/of.h of_platform.h: delete needless include <linux/module.h> acpi: remove module.h include from platform/aclinux.h miscdevice.h: delete unnecessary inclusion of module.h device_cgroup.h: delete needless include <linux/module.h> net: sch_generic remove redundant use of <linux/module.h> net: inet_timewait_sock doesnt need <linux/module.h> ... Fix up trivial conflicts (other header files, and removal of the ab3550 mfd driver) in - drivers/media/dvb/frontends/dibx000_common.c - drivers/media/video/{mt9m111.c,ov6650.c} - drivers/mfd/ab3550-core.c - include/linux/dmaengine.h
425 lines
13 KiB
C
425 lines
13 KiB
C
/*******************************************************************************
|
|
* Filename: target_core_tmr.c
|
|
*
|
|
* This file contains SPC-3 task management infrastructure
|
|
*
|
|
* Copyright (c) 2009,2010 Rising Tide Systems
|
|
* Copyright (c) 2009,2010 Linux-iSCSI.org
|
|
*
|
|
* Nicholas A. Bellinger <nab@kernel.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*
|
|
******************************************************************************/
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/list.h>
|
|
#include <linux/export.h>
|
|
#include <scsi/scsi.h>
|
|
#include <scsi/scsi_cmnd.h>
|
|
|
|
#include <target/target_core_base.h>
|
|
#include <target/target_core_device.h>
|
|
#include <target/target_core_tmr.h>
|
|
#include <target/target_core_transport.h>
|
|
#include <target/target_core_fabric_ops.h>
|
|
#include <target/target_core_configfs.h>
|
|
|
|
#include "target_core_alua.h"
|
|
#include "target_core_pr.h"
|
|
|
|
struct se_tmr_req *core_tmr_alloc_req(
|
|
struct se_cmd *se_cmd,
|
|
void *fabric_tmr_ptr,
|
|
u8 function,
|
|
gfp_t gfp_flags)
|
|
{
|
|
struct se_tmr_req *tmr;
|
|
|
|
tmr = kmem_cache_zalloc(se_tmr_req_cache, gfp_flags);
|
|
if (!tmr) {
|
|
pr_err("Unable to allocate struct se_tmr_req\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
tmr->task_cmd = se_cmd;
|
|
tmr->fabric_tmr_ptr = fabric_tmr_ptr;
|
|
tmr->function = function;
|
|
INIT_LIST_HEAD(&tmr->tmr_list);
|
|
|
|
return tmr;
|
|
}
|
|
EXPORT_SYMBOL(core_tmr_alloc_req);
|
|
|
|
void core_tmr_release_req(
|
|
struct se_tmr_req *tmr)
|
|
{
|
|
struct se_device *dev = tmr->tmr_dev;
|
|
unsigned long flags;
|
|
|
|
if (!dev) {
|
|
kmem_cache_free(se_tmr_req_cache, tmr);
|
|
return;
|
|
}
|
|
|
|
spin_lock_irqsave(&dev->se_tmr_lock, flags);
|
|
list_del(&tmr->tmr_list);
|
|
spin_unlock_irqrestore(&dev->se_tmr_lock, flags);
|
|
|
|
kmem_cache_free(se_tmr_req_cache, tmr);
|
|
}
|
|
|
|
static void core_tmr_handle_tas_abort(
|
|
struct se_node_acl *tmr_nacl,
|
|
struct se_cmd *cmd,
|
|
int tas,
|
|
int fe_count)
|
|
{
|
|
if (!fe_count) {
|
|
transport_cmd_finish_abort(cmd, 1);
|
|
return;
|
|
}
|
|
/*
|
|
* TASK ABORTED status (TAS) bit support
|
|
*/
|
|
if ((tmr_nacl &&
|
|
(tmr_nacl == cmd->se_sess->se_node_acl)) || tas)
|
|
transport_send_task_abort(cmd);
|
|
|
|
transport_cmd_finish_abort(cmd, 0);
|
|
}
|
|
|
|
static void core_tmr_drain_tmr_list(
|
|
struct se_device *dev,
|
|
struct se_tmr_req *tmr,
|
|
struct list_head *preempt_and_abort_list)
|
|
{
|
|
LIST_HEAD(drain_tmr_list);
|
|
struct se_tmr_req *tmr_p, *tmr_pp;
|
|
struct se_cmd *cmd;
|
|
unsigned long flags;
|
|
/*
|
|
* Release all pending and outgoing TMRs aside from the received
|
|
* LUN_RESET tmr..
|
|
*/
|
|
spin_lock_irqsave(&dev->se_tmr_lock, flags);
|
|
list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) {
|
|
/*
|
|
* Allow the received TMR to return with FUNCTION_COMPLETE.
|
|
*/
|
|
if (tmr_p == tmr)
|
|
continue;
|
|
|
|
cmd = tmr_p->task_cmd;
|
|
if (!cmd) {
|
|
pr_err("Unable to locate struct se_cmd for TMR\n");
|
|
continue;
|
|
}
|
|
/*
|
|
* If this function was called with a valid pr_res_key
|
|
* parameter (eg: for PROUT PREEMPT_AND_ABORT service action
|
|
* skip non regisration key matching TMRs.
|
|
*/
|
|
if (preempt_and_abort_list &&
|
|
(core_scsi3_check_cdb_abort_and_preempt(
|
|
preempt_and_abort_list, cmd) != 0))
|
|
continue;
|
|
|
|
spin_lock(&cmd->t_state_lock);
|
|
if (!atomic_read(&cmd->t_transport_active)) {
|
|
spin_unlock(&cmd->t_state_lock);
|
|
continue;
|
|
}
|
|
if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) {
|
|
spin_unlock(&cmd->t_state_lock);
|
|
continue;
|
|
}
|
|
spin_unlock(&cmd->t_state_lock);
|
|
|
|
list_move_tail(&tmr_p->tmr_list, &drain_tmr_list);
|
|
}
|
|
spin_unlock_irqrestore(&dev->se_tmr_lock, flags);
|
|
|
|
list_for_each_entry_safe(tmr_p, tmr_pp, &drain_tmr_list, tmr_list) {
|
|
list_del_init(&tmr_p->tmr_list);
|
|
cmd = tmr_p->task_cmd;
|
|
|
|
pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x,"
|
|
" Response: 0x%02x, t_state: %d\n",
|
|
(preempt_and_abort_list) ? "Preempt" : "", tmr_p,
|
|
tmr_p->function, tmr_p->response, cmd->t_state);
|
|
|
|
transport_cmd_finish_abort(cmd, 1);
|
|
}
|
|
}
|
|
|
|
static void core_tmr_drain_task_list(
|
|
struct se_device *dev,
|
|
struct se_cmd *prout_cmd,
|
|
struct se_node_acl *tmr_nacl,
|
|
int tas,
|
|
struct list_head *preempt_and_abort_list)
|
|
{
|
|
LIST_HEAD(drain_task_list);
|
|
struct se_cmd *cmd;
|
|
struct se_task *task, *task_tmp;
|
|
unsigned long flags;
|
|
int fe_count;
|
|
/*
|
|
* Complete outstanding struct se_task CDBs with TASK_ABORTED SAM status.
|
|
* This is following sam4r17, section 5.6 Aborting commands, Table 38
|
|
* for TMR LUN_RESET:
|
|
*
|
|
* a) "Yes" indicates that each command that is aborted on an I_T nexus
|
|
* other than the one that caused the SCSI device condition is
|
|
* completed with TASK ABORTED status, if the TAS bit is set to one in
|
|
* the Control mode page (see SPC-4). "No" indicates that no status is
|
|
* returned for aborted commands.
|
|
*
|
|
* d) If the logical unit reset is caused by a particular I_T nexus
|
|
* (e.g., by a LOGICAL UNIT RESET task management function), then "yes"
|
|
* (TASK_ABORTED status) applies.
|
|
*
|
|
* Otherwise (e.g., if triggered by a hard reset), "no"
|
|
* (no TASK_ABORTED SAM status) applies.
|
|
*
|
|
* Note that this seems to be independent of TAS (Task Aborted Status)
|
|
* in the Control Mode Page.
|
|
*/
|
|
spin_lock_irqsave(&dev->execute_task_lock, flags);
|
|
list_for_each_entry_safe(task, task_tmp, &dev->state_task_list,
|
|
t_state_list) {
|
|
if (!task->task_se_cmd) {
|
|
pr_err("task->task_se_cmd is NULL!\n");
|
|
continue;
|
|
}
|
|
cmd = task->task_se_cmd;
|
|
|
|
/*
|
|
* For PREEMPT_AND_ABORT usage, only process commands
|
|
* with a matching reservation key.
|
|
*/
|
|
if (preempt_and_abort_list &&
|
|
(core_scsi3_check_cdb_abort_and_preempt(
|
|
preempt_and_abort_list, cmd) != 0))
|
|
continue;
|
|
/*
|
|
* Not aborting PROUT PREEMPT_AND_ABORT CDB..
|
|
*/
|
|
if (prout_cmd == cmd)
|
|
continue;
|
|
|
|
list_move_tail(&task->t_state_list, &drain_task_list);
|
|
atomic_set(&task->task_state_active, 0);
|
|
/*
|
|
* Remove from task execute list before processing drain_task_list
|
|
*/
|
|
if (!list_empty(&task->t_execute_list))
|
|
__transport_remove_task_from_execute_queue(task, dev);
|
|
}
|
|
spin_unlock_irqrestore(&dev->execute_task_lock, flags);
|
|
|
|
while (!list_empty(&drain_task_list)) {
|
|
task = list_entry(drain_task_list.next, struct se_task, t_state_list);
|
|
list_del(&task->t_state_list);
|
|
cmd = task->task_se_cmd;
|
|
|
|
pr_debug("LUN_RESET: %s cmd: %p task: %p"
|
|
" ITT/CmdSN: 0x%08x/0x%08x, i_state: %d, t_state: %d"
|
|
"cdb: 0x%02x\n",
|
|
(preempt_and_abort_list) ? "Preempt" : "", cmd, task,
|
|
cmd->se_tfo->get_task_tag(cmd), 0,
|
|
cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
|
|
cmd->t_task_cdb[0]);
|
|
pr_debug("LUN_RESET: ITT[0x%08x] - pr_res_key: 0x%016Lx"
|
|
" t_task_cdbs: %d t_task_cdbs_left: %d"
|
|
" t_task_cdbs_sent: %d -- t_transport_active: %d"
|
|
" t_transport_stop: %d t_transport_sent: %d\n",
|
|
cmd->se_tfo->get_task_tag(cmd), cmd->pr_res_key,
|
|
cmd->t_task_list_num,
|
|
atomic_read(&cmd->t_task_cdbs_left),
|
|
atomic_read(&cmd->t_task_cdbs_sent),
|
|
atomic_read(&cmd->t_transport_active),
|
|
atomic_read(&cmd->t_transport_stop),
|
|
atomic_read(&cmd->t_transport_sent));
|
|
|
|
/*
|
|
* If the command may be queued onto a workqueue cancel it now.
|
|
*
|
|
* This is equivalent to removal from the execute queue in the
|
|
* loop above, but we do it down here given that
|
|
* cancel_work_sync may block.
|
|
*/
|
|
if (cmd->t_state == TRANSPORT_COMPLETE)
|
|
cancel_work_sync(&cmd->work);
|
|
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
target_stop_task(task, &flags);
|
|
|
|
if (!atomic_dec_and_test(&cmd->t_task_cdbs_ex_left)) {
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
pr_debug("LUN_RESET: Skipping task: %p, dev: %p for"
|
|
" t_task_cdbs_ex_left: %d\n", task, dev,
|
|
atomic_read(&cmd->t_task_cdbs_ex_left));
|
|
continue;
|
|
}
|
|
fe_count = atomic_read(&cmd->t_fe_count);
|
|
|
|
if (atomic_read(&cmd->t_transport_active)) {
|
|
pr_debug("LUN_RESET: got t_transport_active = 1 for"
|
|
" task: %p, t_fe_count: %d dev: %p\n", task,
|
|
fe_count, dev);
|
|
atomic_set(&cmd->t_transport_aborted, 1);
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);
|
|
continue;
|
|
}
|
|
pr_debug("LUN_RESET: Got t_transport_active = 0 for task: %p,"
|
|
" t_fe_count: %d dev: %p\n", task, fe_count, dev);
|
|
atomic_set(&cmd->t_transport_aborted, 1);
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);
|
|
}
|
|
}
|
|
|
|
static void core_tmr_drain_cmd_list(
|
|
struct se_device *dev,
|
|
struct se_cmd *prout_cmd,
|
|
struct se_node_acl *tmr_nacl,
|
|
int tas,
|
|
struct list_head *preempt_and_abort_list)
|
|
{
|
|
LIST_HEAD(drain_cmd_list);
|
|
struct se_queue_obj *qobj = &dev->dev_queue_obj;
|
|
struct se_cmd *cmd, *tcmd;
|
|
unsigned long flags;
|
|
/*
|
|
* Release all commands remaining in the struct se_device cmd queue.
|
|
*
|
|
* This follows the same logic as above for the struct se_device
|
|
* struct se_task state list, where commands are returned with
|
|
* TASK_ABORTED status, if there is an outstanding $FABRIC_MOD
|
|
* reference, otherwise the struct se_cmd is released.
|
|
*/
|
|
spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
|
|
list_for_each_entry_safe(cmd, tcmd, &qobj->qobj_list, se_queue_node) {
|
|
/*
|
|
* For PREEMPT_AND_ABORT usage, only process commands
|
|
* with a matching reservation key.
|
|
*/
|
|
if (preempt_and_abort_list &&
|
|
(core_scsi3_check_cdb_abort_and_preempt(
|
|
preempt_and_abort_list, cmd) != 0))
|
|
continue;
|
|
/*
|
|
* Not aborting PROUT PREEMPT_AND_ABORT CDB..
|
|
*/
|
|
if (prout_cmd == cmd)
|
|
continue;
|
|
|
|
atomic_set(&cmd->t_transport_queue_active, 0);
|
|
atomic_dec(&qobj->queue_cnt);
|
|
list_move_tail(&cmd->se_queue_node, &drain_cmd_list);
|
|
}
|
|
spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
|
|
|
|
while (!list_empty(&drain_cmd_list)) {
|
|
cmd = list_entry(drain_cmd_list.next, struct se_cmd, se_queue_node);
|
|
list_del_init(&cmd->se_queue_node);
|
|
|
|
pr_debug("LUN_RESET: %s from Device Queue: cmd: %p t_state:"
|
|
" %d t_fe_count: %d\n", (preempt_and_abort_list) ?
|
|
"Preempt" : "", cmd, cmd->t_state,
|
|
atomic_read(&cmd->t_fe_count));
|
|
/*
|
|
* Signal that the command has failed via cmd->se_cmd_flags,
|
|
*/
|
|
transport_new_cmd_failure(cmd);
|
|
|
|
core_tmr_handle_tas_abort(tmr_nacl, cmd, tas,
|
|
atomic_read(&cmd->t_fe_count));
|
|
}
|
|
}
|
|
|
|
int core_tmr_lun_reset(
|
|
struct se_device *dev,
|
|
struct se_tmr_req *tmr,
|
|
struct list_head *preempt_and_abort_list,
|
|
struct se_cmd *prout_cmd)
|
|
{
|
|
struct se_node_acl *tmr_nacl = NULL;
|
|
struct se_portal_group *tmr_tpg = NULL;
|
|
int tas;
|
|
/*
|
|
* TASK_ABORTED status bit, this is configurable via ConfigFS
|
|
* struct se_device attributes. spc4r17 section 7.4.6 Control mode page
|
|
*
|
|
* A task aborted status (TAS) bit set to zero specifies that aborted
|
|
* tasks shall be terminated by the device server without any response
|
|
* to the application client. A TAS bit set to one specifies that tasks
|
|
* aborted by the actions of an I_T nexus other than the I_T nexus on
|
|
* which the command was received shall be completed with TASK ABORTED
|
|
* status (see SAM-4).
|
|
*/
|
|
tas = dev->se_sub_dev->se_dev_attrib.emulate_tas;
|
|
/*
|
|
* Determine if this se_tmr is coming from a $FABRIC_MOD
|
|
* or struct se_device passthrough..
|
|
*/
|
|
if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) {
|
|
tmr_nacl = tmr->task_cmd->se_sess->se_node_acl;
|
|
tmr_tpg = tmr->task_cmd->se_sess->se_tpg;
|
|
if (tmr_nacl && tmr_tpg) {
|
|
pr_debug("LUN_RESET: TMR caller fabric: %s"
|
|
" initiator port %s\n",
|
|
tmr_tpg->se_tpg_tfo->get_fabric_name(),
|
|
tmr_nacl->initiatorname);
|
|
}
|
|
}
|
|
pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n",
|
|
(preempt_and_abort_list) ? "Preempt" : "TMR",
|
|
dev->transport->name, tas);
|
|
|
|
core_tmr_drain_tmr_list(dev, tmr, preempt_and_abort_list);
|
|
core_tmr_drain_task_list(dev, prout_cmd, tmr_nacl, tas,
|
|
preempt_and_abort_list);
|
|
core_tmr_drain_cmd_list(dev, prout_cmd, tmr_nacl, tas,
|
|
preempt_and_abort_list);
|
|
/*
|
|
* Clear any legacy SPC-2 reservation when called during
|
|
* LOGICAL UNIT RESET
|
|
*/
|
|
if (!preempt_and_abort_list &&
|
|
(dev->dev_flags & DF_SPC2_RESERVATIONS)) {
|
|
spin_lock(&dev->dev_reservation_lock);
|
|
dev->dev_reserved_node_acl = NULL;
|
|
dev->dev_flags &= ~DF_SPC2_RESERVATIONS;
|
|
spin_unlock(&dev->dev_reservation_lock);
|
|
pr_debug("LUN_RESET: SCSI-2 Released reservation\n");
|
|
}
|
|
|
|
spin_lock_irq(&dev->stats_lock);
|
|
dev->num_resets++;
|
|
spin_unlock_irq(&dev->stats_lock);
|
|
|
|
pr_debug("LUN_RESET: %s for [%s] Complete\n",
|
|
(preempt_and_abort_list) ? "Preempt" : "TMR",
|
|
dev->transport->name);
|
|
return 0;
|
|
}
|
|
|