Re: [PATCH 2/2] drm/amdgpu: Do core dump immediately when job tmo

["Khatri, Sunil" <sunil.khatri@amd.com>]

On 8/19/2024 3:23 PM, Trigger.Huang@amd.com wrote:
> From: Trigger Huang <Trigger.Huang@amd.com>
>
> Do the coredump immediately after a job timeout to get a closer
> representation of GPU's error status.
>
> V2: This will skip printing vram_lost as the GPU reset is not
> happened yet (Alex)
>
> V3: Unconditionally call the core dump as we care about all the reset
> functions(soft-recovery and queue reset and full adapter reset, Alex)
>
> Signed-off-by: Trigger Huang <Trigger.Huang@amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_job.c | 62 +++++++++++++++++++++++++
>   1 file changed, 62 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
> index c6a1783fc9ef..ebbb1434073e 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
> @@ -30,6 +30,61 @@
>   #include "amdgpu.h"
>   #include "amdgpu_trace.h"
>   #include "amdgpu_reset.h"
> +#include "amdgpu_dev_coredump.h"
> +#include "amdgpu_xgmi.h"
> +
> +static void amdgpu_job_do_core_dump(struct amdgpu_device *adev,
> +				    struct amdgpu_job *job)
> +{
> +	int i;
> +
> +	dev_info(adev->dev, "Dumping IP State\n");
> +	for (i = 0; i < adev->num_ip_blocks; i++) {
> +		if (adev->ip_blocks[i].version->funcs->dump_ip_state)
> +			adev->ip_blocks[i].version->funcs
> +				->dump_ip_state((void *)adev);
> +		dev_info(adev->dev, "Dumping IP State Completed\n");
> +	}
> +
> +	amdgpu_coredump(adev, true, false, job);
> +}
> +
> +static void amdgpu_job_core_dump(struct amdgpu_device *adev,
> +				 struct amdgpu_job *job)
> +{
> +	struct list_head device_list, *device_list_handle =  NULL;
> +	struct amdgpu_device *tmp_adev = NULL;
> +	struct amdgpu_hive_info *hive = NULL;
> +
> +	if (!amdgpu_sriov_vf(adev))
> +		hive = amdgpu_get_xgmi_hive(adev);
> +	if (hive)
> +		mutex_lock(&hive->hive_lock);
> +	/*
> +	 * Reuse the logic in amdgpu_device_gpu_recover() to build list of
> +	 * devices for code dump
> +	 */
> +	INIT_LIST_HEAD(&device_list);
> +	if (!amdgpu_sriov_vf(adev) && (adev->gmc.xgmi.num_physical_nodes > 1) && hive) {
> +		list_for_each_entry(tmp_adev, &hive->device_list, gmc.xgmi.head)
> +			list_add_tail(&tmp_adev->reset_list, &device_list);
> +		if (!list_is_first(&adev->reset_list, &device_list))
> +			list_rotate_to_front(&adev->reset_list, &device_list);
> +		device_list_handle = &device_list;
> +	} else {
> +		list_add_tail(&adev->reset_list, &device_list);
> +		device_list_handle = &device_list;
> +	}
> +
> +	/* Do the coredump for each device */
> +	list_for_each_entry(tmp_adev, device_list_handle, reset_list)
> +		amdgpu_job_do_core_dump(tmp_adev, job);
> +
> +	if (hive) {
> +		mutex_unlock(&hive->hive_lock);
> +		amdgpu_put_xgmi_hive(hive);
> +	}
> +}
>   
>   static enum drm_gpu_sched_stat amdgpu_job_timedout(struct drm_sched_job *s_job)
>   {
> @@ -48,6 +103,7 @@ static enum drm_gpu_sched_stat amdgpu_job_timedout(struct drm_sched_job *s_job)
>   		return DRM_GPU_SCHED_STAT_ENODEV;
>   	}
>   
> +	amdgpu_job_core_dump(adev, job);
The philosophy is hang and recovery is to let the HW and software try to 
recover. Here we try to do a soft recovery first and i think we should 
wait for seft recovery and if fails then we do dump and thats exactly we 
are doing here.

Also we need to make sure that the tasks which are already in queue are 
put on hold and the their sync points are signalled before we dump. 
check once what all steps are taken before we dump in the current 
implementation.

Regards

Sunil khatri

>   
>   	adev->job_hang = true;
>   
> @@ -101,6 +157,12 @@ static enum drm_gpu_sched_stat amdgpu_job_timedout(struct drm_sched_job *s_job)
>   		reset_context.src = AMDGPU_RESET_SRC_JOB;
>   		clear_bit(AMDGPU_NEED_FULL_RESET, &reset_context.flags);
>   
> +		/*
> +		 * To avoid an unnecessary extra coredump, as we have already
> +		 * got the very close representation of GPU's error status
> +		 */
> +		set_bit(AMDGPU_SKIP_COREDUMP, &reset_context.flags);
> +
>   		r = amdgpu_device_gpu_recover(ring->adev, job, &reset_context);
>   		if (r)
>   			dev_err(adev->dev, "GPU Recovery Failed: %d\n", r);