target: Remove legacy se_task->task_timer and associated logic
This patch removes the legacy usage of se_task->task_timer and associated
infrastructure that originally was used as a way to help manage buggy backend
SCSI LLDs that in certain cases would never return back an outstanding task.
This includes the removal of target_complete_timeout_work(), timeout logic
from transport_complete_task(), transport_task_timeout_handler(),
transport_start_task_timer(), the per device task_timeout configfs attribute,
and all task_timeout associated structure members and defines in
target_core_base.h
This is being removed in preparation to make transport_complete_task() run
in lock-less mode.
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
index 1511a2f..e0c1e8a 100644
--- a/drivers/target/target_core_configfs.c
+++ b/drivers/target/target_core_configfs.c
@@ -716,9 +716,6 @@
DEF_DEV_ATTRIB(queue_depth);
SE_DEV_ATTR(queue_depth, S_IRUGO | S_IWUSR);
-DEF_DEV_ATTRIB(task_timeout);
-SE_DEV_ATTR(task_timeout, S_IRUGO | S_IWUSR);
-
DEF_DEV_ATTRIB(max_unmap_lba_count);
SE_DEV_ATTR(max_unmap_lba_count, S_IRUGO | S_IWUSR);
@@ -752,7 +749,6 @@
&target_core_dev_attrib_optimal_sectors.attr,
&target_core_dev_attrib_hw_queue_depth.attr,
&target_core_dev_attrib_queue_depth.attr,
- &target_core_dev_attrib_task_timeout.attr,
&target_core_dev_attrib_max_unmap_lba_count.attr,
&target_core_dev_attrib_max_unmap_block_desc_count.attr,
&target_core_dev_attrib_unmap_granularity.attr,
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index 81352b7..f870c3b 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -914,21 +914,6 @@
dev->se_sub_dev->se_dev_attrib.queue_depth = dev_limits->queue_depth;
}
-int se_dev_set_task_timeout(struct se_device *dev, u32 task_timeout)
-{
- if (task_timeout > DA_TASK_TIMEOUT_MAX) {
- pr_err("dev[%p]: Passed task_timeout: %u larger then"
- " DA_TASK_TIMEOUT_MAX\n", dev, task_timeout);
- return -EINVAL;
- } else {
- dev->se_sub_dev->se_dev_attrib.task_timeout = task_timeout;
- pr_debug("dev[%p]: Set SE Device task_timeout: %u\n",
- dev, task_timeout);
- }
-
- return 0;
-}
-
int se_dev_set_max_unmap_lba_count(
struct se_device *dev,
u32 max_unmap_lba_count)
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 5027619..d752558 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -75,7 +75,6 @@
static void transport_complete_task_attr(struct se_cmd *cmd);
static void transport_handle_queue_full(struct se_cmd *cmd,
struct se_device *dev);
-static void transport_direct_request_timeout(struct se_cmd *cmd);
static void transport_free_dev_tasks(struct se_cmd *cmd);
static int transport_generic_get_mem(struct se_cmd *cmd);
static void transport_put_cmd(struct se_cmd *cmd);
@@ -682,26 +681,6 @@
}
EXPORT_SYMBOL(transport_complete_sync_cache);
-static void target_complete_timeout_work(struct work_struct *work)
-{
- struct se_cmd *cmd = container_of(work, struct se_cmd, work);
- unsigned long flags;
-
- /*
- * Reset cmd->t_se_count to allow transport_put_cmd()
- * to allow last call to free memory resources.
- */
- spin_lock_irqsave(&cmd->t_state_lock, flags);
- if (atomic_read(&cmd->t_transport_timeout) > 1) {
- int tmp = (atomic_read(&cmd->t_transport_timeout) - 1);
-
- atomic_sub(tmp, &cmd->t_se_count);
- }
- spin_unlock_irqrestore(&cmd->t_state_lock, flags);
-
- transport_put_cmd(cmd);
-}
-
static void target_complete_failure_work(struct work_struct *work)
{
struct se_cmd *cmd = container_of(work, struct se_cmd, work);
@@ -726,8 +705,6 @@
if (dev)
atomic_inc(&dev->depth_left);
- del_timer(&task->task_timer);
-
spin_lock_irqsave(&cmd->t_state_lock, flags);
task->task_flags &= ~TF_ACTIVE;
@@ -749,35 +726,11 @@
* to complete for an exception condition
*/
if (task->task_flags & TF_REQUEST_STOP) {
- /*
- * Decrement cmd->t_se_count if this task had
- * previously thrown its timeout exception handler.
- */
- if (task->task_flags & TF_TIMEOUT) {
- atomic_dec(&cmd->t_se_count);
- task->task_flags &= ~TF_TIMEOUT;
- }
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
-
complete(&task->task_stop_comp);
return;
}
/*
- * If the task's timeout handler has fired, use the t_task_cdbs_timeout
- * left counter to determine when the struct se_cmd is ready to be queued to
- * the processing thread.
- */
- if (task->task_flags & TF_TIMEOUT) {
- if (!atomic_dec_and_test(&cmd->t_task_cdbs_timeout_left)) {
- spin_unlock_irqrestore(&cmd->t_state_lock, flags);
- return;
- }
- INIT_WORK(&cmd->work, target_complete_timeout_work);
- goto out_queue;
- }
- atomic_dec(&cmd->t_task_cdbs_timeout_left);
-
- /*
* Decrement the outstanding t_task_cdbs_left count. The last
* struct se_task from struct se_cmd will complete itself into the
* device queue depending upon int success.
@@ -800,7 +753,6 @@
INIT_WORK(&cmd->work, target_complete_ok_work);
}
-out_queue:
cmd->t_state = TRANSPORT_COMPLETE;
atomic_set(&cmd->t_transport_active, 1);
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
@@ -1519,7 +1471,6 @@
INIT_LIST_HEAD(&task->t_list);
INIT_LIST_HEAD(&task->t_execute_list);
INIT_LIST_HEAD(&task->t_state_list);
- init_timer(&task->task_timer);
init_completion(&task->task_stop_comp);
task->task_se_cmd = cmd;
task->task_data_direction = data_direction;
@@ -1787,7 +1738,6 @@
spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
pr_debug("Task %p waiting to complete\n", task);
- del_timer_sync(&task->task_timer);
wait_for_completion(&task->task_stop_comp);
pr_debug("Task %p stopped successfully\n", task);
@@ -1876,7 +1826,6 @@
transport_complete_task_attr(cmd);
if (complete) {
- transport_direct_request_timeout(cmd);
cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
}
@@ -1979,25 +1928,6 @@
transport_handle_queue_full(cmd, cmd->se_dev);
}
-static void transport_direct_request_timeout(struct se_cmd *cmd)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&cmd->t_state_lock, flags);
- if (!atomic_read(&cmd->t_transport_timeout)) {
- spin_unlock_irqrestore(&cmd->t_state_lock, flags);
- return;
- }
- if (atomic_read(&cmd->t_task_cdbs_timeout_left)) {
- spin_unlock_irqrestore(&cmd->t_state_lock, flags);
- return;
- }
-
- atomic_sub(atomic_read(&cmd->t_transport_timeout),
- &cmd->t_se_count);
- spin_unlock_irqrestore(&cmd->t_state_lock, flags);
-}
-
static inline u32 transport_lba_21(unsigned char *cdb)
{
return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
@@ -2040,80 +1970,6 @@
spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
}
-/*
- * Called from interrupt context.
- */
-static void transport_task_timeout_handler(unsigned long data)
-{
- struct se_task *task = (struct se_task *)data;
- struct se_cmd *cmd = task->task_se_cmd;
- unsigned long flags;
-
- pr_debug("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
-
- spin_lock_irqsave(&cmd->t_state_lock, flags);
-
- /*
- * Determine if transport_complete_task() has already been called.
- */
- if (!(task->task_flags & TF_ACTIVE)) {
- pr_debug("transport task: %p cmd: %p timeout !TF_ACTIVE\n",
- task, cmd);
- spin_unlock_irqrestore(&cmd->t_state_lock, flags);
- return;
- }
-
- atomic_inc(&cmd->t_se_count);
- atomic_inc(&cmd->t_transport_timeout);
- cmd->t_tasks_failed = 1;
-
- task->task_flags |= TF_TIMEOUT;
- task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT;
- task->task_scsi_status = 1;
-
- if (task->task_flags & TF_REQUEST_STOP) {
- pr_debug("transport task: %p cmd: %p timeout TF_REQUEST_STOP"
- " == 1\n", task, cmd);
- spin_unlock_irqrestore(&cmd->t_state_lock, flags);
- complete(&task->task_stop_comp);
- return;
- }
-
- if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
- pr_debug("transport task: %p cmd: %p timeout non zero"
- " t_task_cdbs_left\n", task, cmd);
- spin_unlock_irqrestore(&cmd->t_state_lock, flags);
- return;
- }
- pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
- task, cmd);
-
- INIT_WORK(&cmd->work, target_complete_failure_work);
- cmd->t_state = TRANSPORT_COMPLETE;
- atomic_set(&cmd->t_transport_active, 1);
- spin_unlock_irqrestore(&cmd->t_state_lock, flags);
-
- queue_work(target_completion_wq, &cmd->work);
-}
-
-static void transport_start_task_timer(struct se_task *task)
-{
- struct se_device *dev = task->task_se_cmd->se_dev;
- int timeout;
-
- /*
- * If the task_timeout is disabled, exit now.
- */
- timeout = dev->se_sub_dev->se_dev_attrib.task_timeout;
- if (!timeout)
- return;
-
- task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
- task->task_timer.data = (unsigned long) task;
- task->task_timer.function = transport_task_timeout_handler;
- add_timer(&task->task_timer);
-}
-
static inline int transport_tcq_window_closed(struct se_device *dev)
{
if (dev->dev_tcq_window_closed++ <
@@ -2296,7 +2152,6 @@
cmd->t_task_list_num)
atomic_set(&cmd->t_transport_sent, 1);
- transport_start_task_timer(task);
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
/*
* The struct se_cmd->transport_emulate_cdb() function pointer is used
@@ -2310,7 +2165,6 @@
spin_lock_irqsave(&cmd->t_state_lock, flags);
task->task_flags &= ~TF_ACTIVE;
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
- del_timer_sync(&task->task_timer);
atomic_set(&cmd->t_transport_sent, 0);
transport_stop_tasks_for_cmd(cmd);
atomic_inc(&dev->depth_left);
@@ -2350,7 +2204,6 @@
spin_lock_irqsave(&cmd->t_state_lock, flags);
task->task_flags &= ~TF_ACTIVE;
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
- del_timer_sync(&task->task_timer);
atomic_set(&cmd->t_transport_sent, 0);
transport_stop_tasks_for_cmd(cmd);
atomic_inc(&dev->depth_left);
@@ -3543,14 +3396,6 @@
while (!list_empty(&dispose_list)) {
task = list_first_entry(&dispose_list, struct se_task, t_list);
- /*
- * We already cancelled all pending timers in
- * transport_complete_task, but that was just a pure del_timer,
- * so do a full del_timer_sync here to make sure any handler
- * that was running at that point has finished execution.
- */
- del_timer_sync(&task->task_timer);
-
if (task->task_sg != cmd->t_data_sg &&
task->task_sg != cmd->t_bidi_data_sg)
kfree(task->task_sg);
@@ -4007,7 +3852,6 @@
cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi);
atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num);
atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num);
- atomic_set(&cmd->t_task_cdbs_timeout_left, cmd->t_task_list_num);
/*
* For WRITEs, let the fabric know its buffer is ready..
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index d210f1f..35aa786 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -75,8 +75,7 @@
enum se_task_flags {
TF_ACTIVE = (1 << 0),
TF_SENT = (1 << 1),
- TF_TIMEOUT = (1 << 2),
- TF_REQUEST_STOP = (1 << 3),
+ TF_REQUEST_STOP = (1 << 2),
};
/* Special transport agnostic struct se_cmd->t_states */
@@ -404,7 +403,6 @@
int task_error_status;
enum dma_data_direction task_data_direction;
atomic_t task_state_active;
- struct timer_list task_timer;
struct list_head t_list;
struct list_head t_execute_list;
struct list_head t_state_list;
@@ -469,7 +467,6 @@
atomic_t t_se_count;
atomic_t t_task_cdbs_left;
atomic_t t_task_cdbs_ex_left;
- atomic_t t_task_cdbs_timeout_left;
atomic_t t_task_cdbs_sent;
atomic_t t_transport_aborted;
atomic_t t_transport_active;
@@ -477,7 +474,6 @@
atomic_t t_transport_queue_active;
atomic_t t_transport_sent;
atomic_t t_transport_stop;
- atomic_t t_transport_timeout;
atomic_t transport_dev_active;
atomic_t transport_lun_active;
atomic_t transport_lun_fe_stop;
@@ -646,7 +642,6 @@
u32 optimal_sectors;
u32 hw_queue_depth;
u32 queue_depth;
- u32 task_timeout;
u32 max_unmap_lba_count;
u32 max_unmap_block_desc_count;
u32 unmap_granularity;
diff --git a/include/target/target_core_transport.h b/include/target/target_core_transport.h
index 32c5863..a037a1a 100644
--- a/include/target/target_core_transport.h
+++ b/include/target/target_core_transport.h
@@ -22,10 +22,9 @@
#define PYX_TRANSPORT_LU_COMM_FAILURE -7
#define PYX_TRANSPORT_UNKNOWN_MODE_PAGE -8
#define PYX_TRANSPORT_WRITE_PROTECTED -9
-#define PYX_TRANSPORT_TASK_TIMEOUT -10
-#define PYX_TRANSPORT_RESERVATION_CONFLICT -11
-#define PYX_TRANSPORT_ILLEGAL_REQUEST -12
-#define PYX_TRANSPORT_USE_SENSE_REASON -13
+#define PYX_TRANSPORT_RESERVATION_CONFLICT -10
+#define PYX_TRANSPORT_ILLEGAL_REQUEST -11
+#define PYX_TRANSPORT_USE_SENSE_REASON -12
#ifndef SAM_STAT_RESERVATION_CONFLICT
#define SAM_STAT_RESERVATION_CONFLICT 0x18
@@ -38,13 +37,6 @@
#define TRANSPORT_PLUGIN_VHBA_PDEV 2
#define TRANSPORT_PLUGIN_VHBA_VDEV 3
-/* For SE OBJ Plugins, in seconds */
-#define TRANSPORT_TIMEOUT_TUR 10
-#define TRANSPORT_TIMEOUT_TYPE_DISK 60
-#define TRANSPORT_TIMEOUT_TYPE_ROM 120
-#define TRANSPORT_TIMEOUT_TYPE_TAPE 600
-#define TRANSPORT_TIMEOUT_TYPE_OTHER 300
-
/*
* struct se_subsystem_dev->su_dev_flags
*/
@@ -61,8 +53,6 @@
#define DF_SPC2_RESERVATIONS_WITH_ISID 0x00000004
/* struct se_dev_attrib sanity values */
-/* 10 Minutes */
-#define DA_TASK_TIMEOUT_MAX 600
/* Default max_unmap_lba_count */
#define DA_MAX_UNMAP_LBA_COUNT 0
/* Default max_unmap_block_desc_count */