[PATCH] drm/amd/amdkfd: Don't sent command to HWS on kfd reset

[shaoyunl]

When kfd need to be reset, sent command to HWS might cause hang and get unnecessary timeout.
This change try not to touch HW in pre_reset and keep queues to be in the evicted state
when the reset is done, so they are not put back on the runlist. These queues will be destroied
on process termination.

Signed-off-by: shaoyunl <shaoyun.liu at amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_device.c               | 6 +++++-
 drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c | 2 +-
 drivers/gpu/drm/amd/amdkfd/kfd_priv.h                 | 2 ++
 drivers/gpu/drm/amd/amdkfd/kfd_process.c              | 6 +++++-
 4 files changed, 13 insertions(+), 3 deletions(-)
 mode change 100644 => 100755 drivers/gpu/drm/amd/amdkfd/kfd_device.c
 mode change 100644 => 100755 drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
 mode change 100644 => 100755 drivers/gpu/drm/amd/amdkfd/kfd_priv.h
 mode change 100644 => 100755 drivers/gpu/drm/amd/amdkfd/kfd_process.c

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device.c b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
old mode 100644
new mode 100755
index c8aade17efef..536ef766d09e
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
@@ -1100,6 +1100,8 @@ int kgd2kfd_pre_reset(struct kfd_dev *kfd)
 	if (!kfd->init_complete)
 		return 0;
 
+	kfd->is_resetting = true;
+
 	kfd_smi_event_update_gpu_reset(kfd, false);
 
 	kfd->dqm->ops.pre_reset(kfd->dqm);
@@ -1132,6 +1134,8 @@ int kgd2kfd_post_reset(struct kfd_dev *kfd)
 
 	kfd_smi_event_update_gpu_reset(kfd, true);
 
+	kfd->is_resetting = false;
+
 	return 0;
 }
 
@@ -1168,7 +1172,7 @@ int kgd2kfd_resume(struct kfd_dev *kfd, bool run_pm)
 		return ret;
 
 	/* for runtime resume, skip unlocking kfd */
-	if (!run_pm) {
+	if (!run_pm && !kfd->is_resetting) {
 		count = atomic_dec_return(&kfd_locked);
 		WARN_ONCE(count < 0, "KFD suspend / resume ref. error");
 		if (count == 0)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
old mode 100644
new mode 100755
index e9601d4dfb77..0a60317509c8
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
@@ -1430,7 +1430,7 @@ static int unmap_queues_cpsch(struct device_queue_manager *dqm,
 
 	if (!dqm->sched_running)
 		return 0;
-	if (dqm->is_hws_hang)
+	if (dqm->is_hws_hang || dqm->is_resetting)
 		return -EIO;
 	if (!dqm->active_runlist)
 		return retval;
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
old mode 100644
new mode 100755
index bfe7bacccb73..e4bcc2a09ca8
--- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
@@ -275,6 +275,8 @@ struct kfd_dev {
 	struct device_queue_manager *dqm;
 
 	bool init_complete;
+	bool is_resetting;
+
 	/*
 	 * Interrupts of interest to KFD are copied
 	 * from the HW ring into a SW ring.
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
old mode 100644
new mode 100755
index f8a8fdb95832..f29b3932e3dc
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
@@ -1715,7 +1715,11 @@ int kfd_process_evict_queues(struct kfd_process *p)
 
 		r = pdd->dev->dqm->ops.evict_process_queues(pdd->dev->dqm,
 							    &pdd->qpd);
-		if (r) {
+		/* evict return -EIO if HWS is hang or asic is resetting, in this case
+		 * we would like to set all the queues to be in evicted state to prevent
+		 * them been add back since they actually not be saved right now.
+		 */
+		if (r && r != -EIO) {
 			pr_err("Failed to evict process queues\n");
 			goto fail;
 		}
-- 
2.17.1