On 2018年09月11日 11:23, Deng, Emily wrote:
-----Original Message-----
From: Zhou, David(ChunMing)
Sent: Tuesday, September 11, 2018 11:03 AM
To: Deng, Emily <emily.d...@amd.com>; amd-gfx@lists.freedesktop.org
Subject: Re: [PATCH] drm/amdgpu: Fix the dead lock issue.
On 2018年09月11日 10:51, Emily Deng wrote:
It will ramdomly have the dead lock issue when test TDR:
1. amdgpu_device_handle_vram_lost gets the lock shadow_list_lock 2.
amdgpu_bo_create locked the bo's resv lock 3. amdgpu_bo_create_shadow
is waiting for the shadow_list_lock 4.
amdgpu_device_recover_vram_from_shadow is waiting for the bo's resv
lock.
v2:
Make a local copy of the list
Signed-off-by: Emily Deng <emily.d...@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 21
++++++++++++++++++++-
1 file changed, 20 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 2a21267..8c81404 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -3105,6 +3105,9 @@ static int
amdgpu_device_handle_vram_lost(struct amdgpu_device *adev)
long r = 1;
int i = 0;
long tmo;
+ struct list_head local_shadow_list;
+
+ INIT_LIST_HEAD(&local_shadow_list);
if (amdgpu_sriov_runtime(adev))
tmo = msecs_to_jiffies(8000);
@@ -3112,8 +3115,19 @@ static int
amdgpu_device_handle_vram_lost(struct amdgpu_device *adev)
tmo = msecs_to_jiffies(100);
DRM_INFO("recover vram bo from shadow start\n");
+
+ mutex_lock(&adev->shadow_list_lock);
+ list_splice_init(&adev->shadow_list, &local_shadow_list);
+ mutex_unlock(&adev->shadow_list_lock);
+
+
mutex_lock(&adev->shadow_list_lock);
local_shadow_list is a local variable, I think it doesn't need lock at all, no
one
change it. Otherwise looks good to me.
The bo->shadow_list which now is in local_shadow_list maybe destroy in case
that it already in amdgpu_bo_destroy, then it will
change local_shadow_list, so need lock the shadow_list_lock.
Ah, sorry for noise, I forget you don't reference these BOs.
Thanks,
David Zhou
Best wishes
Emily Deng
Thanks,
David Zhou
- list_for_each_entry_safe(bo, tmp, &adev->shadow_list, shadow_list) {
+ list_for_each_entry_safe(bo, tmp, &local_shadow_list, shadow_list) {
+ mutex_unlock(&adev->shadow_list_lock);
+
+ if (!bo)
+ continue;
+
next = NULL;
amdgpu_device_recover_vram_from_shadow(adev, ring, bo,
&next);
if (fence) {
@@ -3132,9 +3146,14 @@ static int
amdgpu_device_handle_vram_lost(struct amdgpu_device *adev)
dma_fence_put(fence);
fence = next;
+ mutex_lock(&adev->shadow_list_lock);
}
mutex_unlock(&adev->shadow_list_lock);
+ mutex_lock(&adev->shadow_list_lock);
+ list_splice_init(&local_shadow_list, &adev->shadow_list);
+ mutex_unlock(&adev->shadow_list_lock);
+
if (fence) {
r = dma_fence_wait_timeout(fence, false, tmo);
if (r == 0)
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