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drm/amdgpu: handle the case of pci_channel_io_frozen only in amdgpu_pci_resume

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In current code, when a PCI error state pci_channel_io_normal is detectd,
it will report PCI_ERS_RESULT_CAN_RECOVER status to PCI driver, and PCI
driver will continue the execution of PCI resume callback report_resume by
pci_walk_bridge, and the callback will go into amdgpu_pci_resume
finally, where write lock is releasd unconditionally without acquiring
such lock first. In this case, a deadlock will happen when other threads
start to acquire the read lock.

To fix this, add a member in amdgpu_device strucutre to cache
pci_channel_state, and only continue the execution in amdgpu_pci_resume
when it's pci_channel_io_frozen.

Fixes: c9a6b82f45 ("drm/amdgpu: Implement DPC recovery")
Suggested-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Signed-off-by: Guchun Chen <guchun.chen@amd.com>
Reviewed-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Guchun Chen 2021-10-01 09:48:50 +08:00 committed by Alex Deucher
parent 714d9e4574
commit 248b061689
2 changed files with 7 additions and 0 deletions
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1
drivers/gpu/drm/amd/amdgpu/amdgpu.h
View file

@ -1087,6 +1087,7 @@ struct amdgpu_device {
bool no_hw_access;
struct pci_saved_state *pci_state;
pci_channel_state_t pci_channel_state;
struct amdgpu_reset_control *reset_cntl;
};

6
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
View file

@ -5399,6 +5399,8 @@ pci_ers_result_t amdgpu_pci_error_detected(struct pci_dev *pdev, pci_channel_sta
return PCI_ERS_RESULT_DISCONNECT;
}
adev->pci_channel_state = state;
switch (state) {
case pci_channel_io_normal:
return PCI_ERS_RESULT_CAN_RECOVER;
@ -5541,6 +5543,10 @@ void amdgpu_pci_resume(struct pci_dev *pdev)
DRM_INFO("PCI error: resume callback!!\n");
/* Only continue execution for the case of pci_channel_io_frozen */
if (adev->pci_channel_state != pci_channel_io_frozen)
return;
for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
struct amdgpu_ring *ring = adev->rings[i];