Re: [PATCH 1/2] amd/amdkfd: sync all devices to wait all processes being evicted

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




On 2024-04-03 14:12, Zhigang Luo wrote:
If there are more than one device doing reset in parallel, the first
device will call kfd_suspend_all_processes() to evict all processes
on all devices, this call takes time to finish. other device will
start reset and recover without waiting. if the process has not been
evicted before doing recover, it will be restored, then caused page
fault.

Signed-off-by: Zhigang Luo <Zhigang.Luo@xxxxxxx>

This patch is

Reviewed-by: Felix Kuehling <felix.kuehling@xxxxxxx>


---
  drivers/gpu/drm/amd/amdkfd/kfd_device.c | 17 ++++++-----------
  1 file changed, 6 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device.c b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
index 041ec3de55e7..719d6d365e15 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
@@ -960,7 +960,6 @@ void kgd2kfd_suspend(struct kfd_dev *kfd, bool run_pm)
  {
  	struct kfd_node *node;
  	int i;
-	int count;
if (!kfd->init_complete)
  		return;
@@ -968,12 +967,10 @@ void kgd2kfd_suspend(struct kfd_dev *kfd, bool run_pm)
  	/* for runtime suspend, skip locking kfd */
  	if (!run_pm) {
  		mutex_lock(&kfd_processes_mutex);
-		count = ++kfd_locked;
-		mutex_unlock(&kfd_processes_mutex);
-
  		/* For first KFD device suspend all the KFD processes */
-		if (count == 1)
+		if (++kfd_locked == 1)
  			kfd_suspend_all_processes();
+		mutex_unlock(&kfd_processes_mutex);
  	}
for (i = 0; i < kfd->num_nodes; i++) {
@@ -984,7 +981,7 @@ void kgd2kfd_suspend(struct kfd_dev *kfd, bool run_pm)
int kgd2kfd_resume(struct kfd_dev *kfd, bool run_pm)
  {
-	int ret, count, i;
+	int ret, i;
if (!kfd->init_complete)
  		return 0;
@@ -998,12 +995,10 @@ int kgd2kfd_resume(struct kfd_dev *kfd, bool run_pm)
  	/* for runtime resume, skip unlocking kfd */
  	if (!run_pm) {
  		mutex_lock(&kfd_processes_mutex);
-		count = --kfd_locked;
-		mutex_unlock(&kfd_processes_mutex);
-
-		WARN_ONCE(count < 0, "KFD suspend / resume ref. error");
-		if (count == 0)
+		if (--kfd_locked == 0)
  			ret = kfd_resume_all_processes();
+		WARN_ONCE(kfd_locked < 0, "KFD suspend / resume ref. error");
+		mutex_unlock(&kfd_processes_mutex);
  	}
return ret;



[Index of Archives]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux