git/linux-cryptodev-2.6
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git synced 2026-04-23 05:56:14 -04:00
Code Issues Packages Projects Releases Wiki Activity

drm/amdkfd: Fix a concurrency issue during kfd recovery

Browse Source 
start_cpsch and stop_cpsch can be called during kfd device
initialization or during gpu reset/recovery. So they can
run concurrently. Currently in start_cpsch and stop_cpsch,
pm_init and pm_uninit is not protected by the dpm lock.
Imagine such a case that user use packet manager's function
to submit a pm4 packet to hang hws (ie through command
cat /sys/class/kfd/kfd/topology/nodes/1/gpu_id | sudo tee
/sys/kernel/debug/kfd/hang_hws), while kfd device is under
device reset/recovery so packet manager can be not initialized.
There will be unpredictable protection fault in such case.

This patch moves pm_init/uninit inside the dpm lock and check
packet manager is initialized before using packet manager
function.

Signed-off-by: Oak Zeng <Oak.Zeng@amd.com>
Acked-by: Christian Konig <christian.koenig@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Oak Zeng
2021-07-15 18:34:25 -05:00
committed by Alex Deucher
parent 78ccea9ff2
commit 4f942aaeb1
4 changed files with 14 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/amd/amdkfd/kfd_priv.h
View File

@@ -1194,7 +1194,7 @@ int pm_debugfs_runlist(struct seq_file *m, void *data);
int kfd_debugfs_hang_hws(struct kfd_dev *dev);
int pm_debugfs_hang_hws(struct packet_manager *pm);
int dqm_debugfs_execute_queues(struct device_queue_manager *dqm);
int dqm_debugfs_hang_hws(struct device_queue_manager *dqm);
#else