[PATCH v2] drm/amdkfd: don't use dqm lock during device reset/suspend/resume
Yang, Philip
Philip.Yang at amd.com
Tue Oct 22 18:28:16 UTC 2019
If device reset/suspend/resume failed for some reason, dqm lock is
hold forever and this causes deadlock. Below is a kernel backtrace when
application open kfd after suspend/resume failed.
Instead of holding dqm lock in pre_reset and releasing dqm lock in
post_reset, add dqm->device_stopped flag which is modified in
dqm->ops.start and dqm->ops.stop. The flag doesn't need lock protection
because write/read are all inside dqm lock.
For HWS case, map_queues_cpsch and unmap_queues_cpsch checks
device_stopped flag before sending the updated runlist.
v2: For no-HWS case, when device is stopped, don't call
load/destroy_mqd for eviction, restore and create queue, and avoid
debugfs dump hdqs.
Backtrace of dqm lock deadlock:
[Thu Oct 17 16:43:37 2019] INFO: task rocminfo:3024 blocked for more
than 120 seconds.
[Thu Oct 17 16:43:37 2019] Not tainted
5.0.0-rc1-kfd-compute-rocm-dkms-no-npi-1131 #1
[Thu Oct 17 16:43:37 2019] "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Thu Oct 17 16:43:37 2019] rocminfo D 0 3024 2947
0x80000000
[Thu Oct 17 16:43:37 2019] Call Trace:
[Thu Oct 17 16:43:37 2019] ? __schedule+0x3d9/0x8a0
[Thu Oct 17 16:43:37 2019] schedule+0x32/0x70
[Thu Oct 17 16:43:37 2019] schedule_preempt_disabled+0xa/0x10
[Thu Oct 17 16:43:37 2019] __mutex_lock.isra.9+0x1e3/0x4e0
[Thu Oct 17 16:43:37 2019] ? __call_srcu+0x264/0x3b0
[Thu Oct 17 16:43:37 2019] ? process_termination_cpsch+0x24/0x2f0
[amdgpu]
[Thu Oct 17 16:43:37 2019] process_termination_cpsch+0x24/0x2f0
[amdgpu]
[Thu Oct 17 16:43:37 2019]
kfd_process_dequeue_from_all_devices+0x42/0x60 [amdgpu]
[Thu Oct 17 16:43:37 2019] kfd_process_notifier_release+0x1be/0x220
[amdgpu]
[Thu Oct 17 16:43:37 2019] __mmu_notifier_release+0x3e/0xc0
[Thu Oct 17 16:43:37 2019] exit_mmap+0x160/0x1a0
[Thu Oct 17 16:43:37 2019] ? __handle_mm_fault+0xba3/0x1200
[Thu Oct 17 16:43:37 2019] ? exit_robust_list+0x5a/0x110
[Thu Oct 17 16:43:37 2019] mmput+0x4a/0x120
[Thu Oct 17 16:43:37 2019] do_exit+0x284/0xb20
[Thu Oct 17 16:43:37 2019] ? handle_mm_fault+0xfa/0x200
[Thu Oct 17 16:43:37 2019] do_group_exit+0x3a/0xa0
[Thu Oct 17 16:43:37 2019] __x64_sys_exit_group+0x14/0x20
[Thu Oct 17 16:43:37 2019] do_syscall_64+0x4f/0x100
[Thu Oct 17 16:43:37 2019] entry_SYSCALL_64_after_hwframe+0x44/0xa9
Suggested-by: Felix Kuehling <Felix.Kuehling at amd.com>
Signed-off-by: Philip Yang <Philip.Yang at amd.com>
---
drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 6 +--
drivers/gpu/drm/amd/amdkfd/kfd_device.c | 5 --
.../drm/amd/amdkfd/kfd_device_queue_manager.c | 47 +++++++++++++++++--
.../drm/amd/amdkfd/kfd_device_queue_manager.h | 1 +
4 files changed, 46 insertions(+), 13 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
index d9e36dbf13d5..40d75c39f08e 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
@@ -120,13 +120,13 @@ static int kfd_open(struct inode *inode, struct file *filep)
return -EPERM;
}
+ if (kfd_is_locked())
+ return -EAGAIN;
+
process = kfd_create_process(filep);
if (IS_ERR(process))
return PTR_ERR(process);
- if (kfd_is_locked())
- return -EAGAIN;
-
dev_dbg(kfd_device, "process %d opened, compat mode (32 bit) - %d\n",
process->pasid, process->is_32bit_user_mode);
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device.c b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
index 8f4b24e84964..4fa8834ce7cb 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
@@ -730,9 +730,6 @@ int kgd2kfd_pre_reset(struct kfd_dev *kfd)
return 0;
kgd2kfd_suspend(kfd);
- /* hold dqm->lock to prevent further execution*/
- dqm_lock(kfd->dqm);
-
kfd_signal_reset_event(kfd);
return 0;
}
@@ -750,8 +747,6 @@ int kgd2kfd_post_reset(struct kfd_dev *kfd)
if (!kfd->init_complete)
return 0;
- dqm_unlock(kfd->dqm);
-
ret = kfd_resume(kfd);
if (ret)
return ret;
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
index 81fb545cf42c..82e1c6280d13 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
@@ -340,6 +340,10 @@ static int create_queue_nocpsch(struct device_queue_manager *dqm,
mqd_mgr->init_mqd(mqd_mgr, &q->mqd, q->mqd_mem_obj,
&q->gart_mqd_addr, &q->properties);
if (q->properties.is_active) {
+ if (!dqm->sched_running) {
+ WARN_ONCE(1, "Load non-HWS mqd while stopped\n");
+ goto add_queue_to_list;
+ }
if (WARN(q->process->mm != current->mm,
"should only run in user thread"))
@@ -351,6 +355,7 @@ static int create_queue_nocpsch(struct device_queue_manager *dqm,
goto out_free_mqd;
}
+add_queue_to_list:
list_add(&q->list, &qpd->queues_list);
qpd->queue_count++;
if (q->properties.is_active)
@@ -458,6 +463,11 @@ static int destroy_queue_nocpsch_locked(struct device_queue_manager *dqm,
deallocate_doorbell(qpd, q);
+ if (!dqm->sched_running) {
+ WARN_ONCE(1, "Destroy non-HWS queue while stopped\n");
+ return 0;
+ }
+
retval = mqd_mgr->destroy_mqd(mqd_mgr, q->mqd,
KFD_PREEMPT_TYPE_WAVEFRONT_RESET,
KFD_UNMAP_LATENCY_MS,
@@ -533,6 +543,12 @@ static int update_queue(struct device_queue_manager *dqm, struct queue *q)
(q->properties.type == KFD_QUEUE_TYPE_COMPUTE ||
q->properties.type == KFD_QUEUE_TYPE_SDMA ||
q->properties.type == KFD_QUEUE_TYPE_SDMA_XGMI)) {
+
+ if (!dqm->sched_running) {
+ WARN_ONCE(1, "Update non-HWS queue while stopped\n");
+ goto out_unlock;
+ }
+
retval = mqd_mgr->destroy_mqd(mqd_mgr, q->mqd,
KFD_PREEMPT_TYPE_WAVEFRONT_DRAIN,
KFD_UNMAP_LATENCY_MS, q->pipe, q->queue);
@@ -602,6 +618,11 @@ static int evict_process_queues_nocpsch(struct device_queue_manager *dqm,
mqd_mgr = dqm->mqd_mgrs[get_mqd_type_from_queue_type(
q->properties.type)];
q->properties.is_active = false;
+ dqm->queue_count--;
+
+ if (!dqm->sched_running)
+ continue;
+
retval = mqd_mgr->destroy_mqd(mqd_mgr, q->mqd,
KFD_PREEMPT_TYPE_WAVEFRONT_DRAIN,
KFD_UNMAP_LATENCY_MS, q->pipe, q->queue);
@@ -610,7 +631,6 @@ static int evict_process_queues_nocpsch(struct device_queue_manager *dqm,
* maintain a consistent eviction state
*/
ret = retval;
- dqm->queue_count--;
}
out:
@@ -711,6 +731,11 @@ static int restore_process_queues_nocpsch(struct device_queue_manager *dqm,
mqd_mgr = dqm->mqd_mgrs[get_mqd_type_from_queue_type(
q->properties.type)];
q->properties.is_active = true;
+ dqm->queue_count++;
+
+ if (!dqm->sched_running)
+ continue;
+
retval = mqd_mgr->load_mqd(mqd_mgr, q->mqd, q->pipe,
q->queue, &q->properties, mm);
if (retval && !ret)
@@ -718,7 +743,6 @@ static int restore_process_queues_nocpsch(struct device_queue_manager *dqm,
* maintain a consistent eviction state
*/
ret = retval;
- dqm->queue_count++;
}
qpd->evicted = 0;
out:
@@ -915,7 +939,8 @@ static int start_nocpsch(struct device_queue_manager *dqm)
if (dqm->dev->device_info->asic_family == CHIP_HAWAII)
return pm_init(&dqm->packets, dqm);
-
+ dqm->sched_running = true;
+
return 0;
}
@@ -923,7 +948,8 @@ static int stop_nocpsch(struct device_queue_manager *dqm)
{
if (dqm->dev->device_info->asic_family == CHIP_HAWAII)
pm_uninit(&dqm->packets);
-
+ dqm->sched_running = false;
+
return 0;
}
@@ -1074,6 +1100,7 @@ static int start_cpsch(struct device_queue_manager *dqm)
dqm_lock(dqm);
/* clear hang status when driver try to start the hw scheduler */
dqm->is_hws_hang = false;
+ dqm->sched_running = true;
execute_queues_cpsch(dqm, KFD_UNMAP_QUEUES_FILTER_DYNAMIC_QUEUES, 0);
dqm_unlock(dqm);
@@ -1089,6 +1116,7 @@ static int stop_cpsch(struct device_queue_manager *dqm)
{
dqm_lock(dqm);
unmap_queues_cpsch(dqm, KFD_UNMAP_QUEUES_FILTER_ALL_QUEUES, 0);
+ dqm->sched_running = false;
dqm_unlock(dqm);
kfd_gtt_sa_free(dqm->dev, dqm->fence_mem);
@@ -1275,9 +1303,10 @@ static int map_queues_cpsch(struct device_queue_manager *dqm)
{
int retval;
+ if (!dqm->sched_running)
+ return 0;
if (dqm->queue_count <= 0 || dqm->processes_count <= 0)
return 0;
-
if (dqm->active_runlist)
return 0;
@@ -1299,6 +1328,8 @@ static int unmap_queues_cpsch(struct device_queue_manager *dqm,
{
int retval = 0;
+ if (!dqm->sched_running)
+ return 0;
if (dqm->is_hws_hang)
return -EIO;
if (!dqm->active_runlist)
@@ -1903,6 +1934,12 @@ int dqm_debugfs_hqds(struct seq_file *m, void *data)
int pipe, queue;
int r = 0;
+ if (!dqm->sched_running) {
+ seq_printf(m, " Device is stopped\n");
+
+ return 0;
+ }
+
r = dqm->dev->kfd2kgd->hqd_dump(dqm->dev->kgd,
KFD_CIK_HIQ_PIPE, KFD_CIK_HIQ_QUEUE,
&dump, &n_regs);
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.h b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.h
index 2eaea6b04cbe..a8c37e6da027 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.h
@@ -201,6 +201,7 @@ struct device_queue_manager {
bool is_hws_hang;
struct work_struct hw_exception_work;
struct kfd_mem_obj hiq_sdma_mqd;
+ bool sched_running;
};
void device_queue_manager_init_cik(
--
2.17.1
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