Re: [PATCH v2 8/8] drm/amdgpu: Prevent any job recoveries after device is unplugged.

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On 11/17/20 1:52 PM, Daniel Vetter wrote:
On Tue, Nov 17, 2020 at 01:38:14PM -0500, Andrey Grodzovsky wrote:
On 6/22/20 5:53 AM, Daniel Vetter wrote:
On Sun, Jun 21, 2020 at 02:03:08AM -0400, Andrey Grodzovsky wrote:
No point to try recovery if device is gone, just messes up things.

Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@xxxxxxx>
---
   drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 16 ++++++++++++++++
   drivers/gpu/drm/amd/amdgpu/amdgpu_job.c |  8 ++++++++
   2 files changed, 24 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 6932d75..5d6d3d9 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -1129,12 +1129,28 @@ static int amdgpu_pci_probe(struct pci_dev *pdev,
   	return ret;
   }
+static void amdgpu_cancel_all_tdr(struct amdgpu_device *adev)
+{
+	int i;
+
+	for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
+		struct amdgpu_ring *ring = adev->rings[i];
+
+		if (!ring || !ring->sched.thread)
+			continue;
+
+		cancel_delayed_work_sync(&ring->sched.work_tdr);
+	}
+}
I think this is a function that's supposed to be in drm/scheduler, not
here. Might also just be your cleanup code being ordered wrongly, or your
split in one of the earlier patches not done quite right.
-Daniel

This function iterates across all the schedulers  per amdgpu device and accesses
amdgpu specific structures , drm/scheduler deals with single scheduler at most
so looks to me like this is the right place for this function
I guess we could keep track of all schedulers somewhere in a list in
struct drm_device and wrap this up. That was kinda the idea.

Minimally I think a tiny wrapper with docs for the
cancel_delayed_work_sync(&sched->work_tdr); which explains what you must
observe to make sure there's no race.


Will do


I'm not exactly sure there's no
guarantee here we won't get a new tdr work launched right afterwards at
least, so this looks a bit like a hack.


Note that for any TDR work happening post amdgpu_cancel_all_tdr amdgpu_job_timedout->drm_dev_is_unplugged will return true and so it will return early. To make it water proof tight against race
i can switch from drm_dev_is_unplugged to drm_dev_enter/exit

Andrey


-Daniel

Andrey


+
   static void
   amdgpu_pci_remove(struct pci_dev *pdev)
   {
   	struct drm_device *dev = pci_get_drvdata(pdev);
+	struct amdgpu_device *adev = dev->dev_private;
   	drm_dev_unplug(dev);
+	amdgpu_cancel_all_tdr(adev);
   	ttm_bo_unmap_virtual_address_space(&adev->mman.bdev);
   	amdgpu_driver_unload_kms(dev);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
index 4720718..87ff0c0 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
@@ -28,6 +28,8 @@
   #include "amdgpu.h"
   #include "amdgpu_trace.h"
+#include <drm/drm_drv.h>
+
   static void amdgpu_job_timedout(struct drm_sched_job *s_job)
   {
   	struct amdgpu_ring *ring = to_amdgpu_ring(s_job->sched);
@@ -37,6 +39,12 @@ static void amdgpu_job_timedout(struct drm_sched_job *s_job)
   	memset(&ti, 0, sizeof(struct amdgpu_task_info));
+	if (drm_dev_is_unplugged(adev->ddev)) {
+		DRM_INFO("ring %s timeout, but device unplugged, skipping.\n",
+					  s_job->sched->name);
+		return;
+	}
+
   	if (amdgpu_ring_soft_recovery(ring, job->vmid, s_job->s_fence->parent)) {
   		DRM_ERROR("ring %s timeout, but soft recovered\n",
   			  s_job->sched->name);
--
2.7.4

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