Re: [PATCH 3/4] drm/amdgpu: Avoid HW reset if guilty job already signaled.

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On 4/12/19 3:39 AM, Christian König wrote:
> Am 11.04.19 um 18:03 schrieb Andrey Grodzovsky:
>> Also reject TDRs if another one already running.
>>
>> v2:
>> Stop all schedulers across device and entire XGMI hive before
>> force signaling HW fences.
>>
>> Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@xxxxxxx>
>> ---
>>   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 125 
>> ++++++++++++++++++++---------
>>   1 file changed, 88 insertions(+), 37 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c 
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>> index aabd043..ce9c494 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>> @@ -3327,7 +3327,8 @@ bool amdgpu_device_should_recover_gpu(struct 
>> amdgpu_device *adev)
>>     static int amdgpu_device_pre_asic_reset(struct amdgpu_device *adev,
>>                       struct amdgpu_job *job,
>> -                    bool *need_full_reset_arg)
>> +                    bool *need_full_reset_arg,
>> +                    bool job_signaled)
>>   {
>>       int i, r = 0;
>>       bool need_full_reset  = *need_full_reset_arg;
>> @@ -3339,8 +3340,6 @@ static int amdgpu_device_pre_asic_reset(struct 
>> amdgpu_device *adev,
>>           if (!ring || !ring->sched.thread)
>>               continue;
>>   -        drm_sched_stop(&ring->sched, &job->base);
>> -
>>           /* after all hw jobs are reset, hw fence is meaningless, so 
>> force_completion */
>>           amdgpu_fence_driver_force_completion(ring);
>>       }
>> @@ -3358,7 +3357,8 @@ static int amdgpu_device_pre_asic_reset(struct 
>> amdgpu_device *adev,
>>       -    if (!amdgpu_sriov_vf(adev)) {
>> +    /* Don't suspend on bare metal if we are not going to HW reset 
>> the ASIC */
>> +    if (!amdgpu_sriov_vf(adev) && !job_signaled) {
>>             if (!need_full_reset)
>>               need_full_reset = amdgpu_device_ip_need_full_reset(adev);
>> @@ -3495,7 +3495,7 @@ static int amdgpu_do_asic_reset(struct 
>> amdgpu_hive_info *hive,
>>       return r;
>>   }
>>   -static void amdgpu_device_post_asic_reset(struct amdgpu_device *adev)
>> +static void amdgpu_device_post_asic_reset(struct amdgpu_device 
>> *adev, bool job_signaled)
>>   {
>>       int i;
>>   @@ -3505,7 +3505,8 @@ static void 
>> amdgpu_device_post_asic_reset(struct amdgpu_device *adev)
>>           if (!ring || !ring->sched.thread)
>>               continue;
>>   -        if (!adev->asic_reset_res)
>> +        /* No point to resubmit jobs if we didn't HW reset*/
>> +        if (!adev->asic_reset_res && !job_signaled)
>>               drm_sched_resubmit_jobs(&ring->sched);
>>             drm_sched_start(&ring->sched, !adev->asic_reset_res);
>> @@ -3518,14 +3519,21 @@ static void 
>> amdgpu_device_post_asic_reset(struct amdgpu_device *adev)
>>       adev->asic_reset_res = 0;
>>   }
>>   -static void amdgpu_device_lock_adev(struct amdgpu_device *adev)
>> +static bool amdgpu_device_lock_adev(struct amdgpu_device *adev, bool 
>> trylock)
>>   {
>> -    mutex_lock(&adev->lock_reset);
>> +    if (trylock) {
>> +        if (!mutex_trylock(&adev->lock_reset))
>> +            return false;
>> +    } else
>> +        mutex_lock(&adev->lock_reset);
>> +
>>       atomic_inc(&adev->gpu_reset_counter);
>>       adev->in_gpu_reset = 1;
>>       /* Block kfd: SRIOV would do it separately */
>>       if (!amdgpu_sriov_vf(adev))
>>                   amdgpu_amdkfd_pre_reset(adev);
>> +
>> +    return true;
>>   }
>>     static void amdgpu_device_unlock_adev(struct amdgpu_device *adev)
>> @@ -3553,38 +3561,43 @@ static void amdgpu_device_unlock_adev(struct 
>> amdgpu_device *adev)
>>   int amdgpu_device_gpu_recover(struct amdgpu_device *adev,
>>                     struct amdgpu_job *job)
>>   {
>> -    int r;
>> +    int r, i;
>
> BTW: Usual kernel coding style is to use reverse xmas tree. E.g. 
> variables like "int i, r" last in the declarations.
>
>>       struct amdgpu_hive_info *hive = NULL;
>> -    bool need_full_reset = false;
>>       struct amdgpu_device *tmp_adev = NULL;
>>       struct list_head device_list, *device_list_handle =  NULL;
>> +    bool xgmi_topology_present, need_full_reset, job_signaled;
>>   +    need_full_reset = job_signaled = false;
>>       INIT_LIST_HEAD(&device_list);
>>         dev_info(adev->dev, "GPU reset begin!\n");
>>   +    hive = amdgpu_get_xgmi_hive(adev, 0);
>
> The second parameter should actually be a bool, so please use false here.
>
>> +    xgmi_topology_present = hive && 
>> adev->gmc.xgmi.num_physical_nodes > 1;
>
> Why are we actually checking num_physical_nodes here?

That the usual way of knowing you have XGMI topology, but having 
hive!=NULL should be equivalent so I can remove it.


>
>> +
>>       /*
>> -     * In case of XGMI hive disallow concurrent resets to be triggered
>> -     * by different nodes. No point also since the one node already 
>> executing
>> -     * reset will also reset all the other nodes in the hive.
>> +     * Here we trylock to avoid chain of resets executing from
>> +     * either trigger by jobs on different adevs in XGMI hive or 
>> jobs on
>> +     * different schedulers for same device while this tdr is running.
>
> Can we please completely drop the name "tdr" and just write "timeout 
> handler"?
>
>> +     * We always reset all schedulers for device and all devices for 
>> XGMI
>> +     * hive so that should take care of them too.
>>        */
>> -    hive = amdgpu_get_xgmi_hive(adev, 0);
>> -    if (hive && adev->gmc.xgmi.num_physical_nodes > 1 &&
>> -        !mutex_trylock(&hive->reset_lock))
>> +
>> +    if (xgmi_topology_present && !mutex_trylock(&hive->reset_lock)) {
>> +        DRM_INFO("Bailing on TDR for s_job:%llx, hive: %llx as 
>> another already in progress",
>> +             job->base.id, hive->hive_id);
>>           return 0;
>> +    }
>>         /* Start with adev pre asic reset first for soft reset check.*/
>> -    amdgpu_device_lock_adev(adev);
>> -    r = amdgpu_device_pre_asic_reset(adev,
>> -                     job,
>> -                     &need_full_reset);
>> -    if (r) {
>> -        /*TODO Should we stop ?*/
>> -        DRM_ERROR("GPU pre asic reset failed with err, %d for drm 
>> dev, %s ",
>> -              r, adev->ddev->unique);
>> -        adev->asic_reset_res = r;
>> +    if (!amdgpu_device_lock_adev(adev, !xgmi_topology_present)) {
>> +        DRM_INFO("Bailing on TDR for s_job:%llx, as another already 
>> in progress",
>> +                     job->base.id);
>> +        return 0;
>>       }
>>   +    need_full_reset = amdgpu_device_ip_need_full_reset(adev);
>> +
>>       /* Build list of devices to reset */
>>       if  (need_full_reset && adev->gmc.xgmi.num_physical_nodes > 1) {
>
> We should probably unconditionally stop all nodes on all device first 
> and then try to figure out if we actually need a full reset.
>
>>           if (!hive) {
>> @@ -3603,16 +3616,52 @@ int amdgpu_device_gpu_recover(struct 
>> amdgpu_device *adev,
>>           device_list_handle = &device_list;
>>       }
>>   +    /* block all schedulers and reset given job's ring */
>> +    list_for_each_entry(tmp_adev, device_list_handle, gmc.xgmi.head) {
>> +        for (i = 0; i < AMDGPU_MAX_RINGSBuild list of devices to reset
>> ; ++i) {
>> +            struct amdgpu_ring *ring = tmp_adev->rings[i];
>> +
>> +            if (!ring || !ring->sched.thread)
>> +                continue;
>> +
>> +            drm_sched_stop(&ring->sched, &job->base);
>> +        }
>> +    }
>> +
>> +    /*
>> +     * Must check guilty signal here since after this point all old
>> +     * HW fences are force signaled.
>> +     *
>> +     * job->base holds a reference to parent fence
>> +     */
>> +    if (job && job->base.s_fence->parent &&
>> +        dma_fence_is_signaled(job->base.s_fence->parent))
>> +        job_signaled = true;
>
> It would probably be better if we have a "goto abort;" or something 
> similar here.
>
> This also avoids giving the job_signaled variable to all the sub 
> functions.
>
> Christian.


I agree this would be good in case of amdgpu_device_pre_asic_reset 
because we can totally skip this function if guilty job already 
signaled, but for amdgpu_device_post_asic_reset it crates complications 
because drm_sched_start is right in the middle there after 
drm_sched_resubmit_jobs but before forcing back set mode in display so I 
prefer to keep passing 'job_signaled' to amdgpu_device_post_asic_reset. 
Alternative is to get rid of this function and bring it's body into 
amdgpu_device_gpu_recover which is already pretty cluttered and 
confusing.  What do you think ?

Andrey

>
>> +
>> +
>> +    /* Guilty job will be freed after this*/
>> +    r = amdgpu_device_pre_asic_reset(adev,
>> +                     job,
>> +                     &need_full_reset,
>> +                     job_signaled);
>> +    if (r) {
>> +        /*TODO Should we stop ?*/
>> +        DRM_ERROR("GPU pre asic reset failed with err, %d for drm 
>> dev, %s ",
>> +              r, adev->ddev->unique);
>> +        adev->asic_reset_res = r;
>> +    }
>> +
>>   retry:    /* Rest of adevs pre asic reset from XGMI hive. */
>>       list_for_each_entry(tmp_adev, device_list_handle, gmc.xgmi.head) {
>>             if (tmp_adev == adev)
>>               continue;
>>   -        amdgpu_device_lock_adev(tmp_adev);
>> +        amdgpu_device_lock_adev(tmp_adev, false);
>>           r = amdgpu_device_pre_asic_reset(tmp_adev,
>>                            NULL,
>> -                         &need_full_reset);
>> +                         &need_full_reset,
>> +                         job_signaled);
>>           /*TODO Should we stop ?*/
>>           if (r) {
>>               DRM_ERROR("GPU pre asic reset failed with err, %d for 
>> drm dev, %s ",
>> @@ -3623,19 +3672,21 @@ int amdgpu_device_gpu_recover(struct 
>> amdgpu_device *adev,
>>         /* Actual ASIC resets if needed.*/
>>       /* TODO Implement XGMI hive reset logic for SRIOV */
>> -    if (amdgpu_sriov_vf(adev)) {
>> -        r = amdgpu_device_reset_sriov(adev, job ? false : true);
>> -        if (r)
>> -            adev->asic_reset_res = r;
>> -    } else {
>> -        r  = amdgpu_do_asic_reset(hive, device_list_handle, 
>> &need_full_reset);
>> -        if (r && r == -EAGAIN)
>> -            goto retry;
>> +    if (!job || !job_signaled) {
>> +        if (amdgpu_sriov_vf(adev)) {
>> +            r = amdgpu_device_reset_sriov(adev, job ? false : true);
>> +            if (r)
>> +                adev->asic_reset_res = r;
>> +        } else {
>> +            r  = amdgpu_do_asic_reset(hive, device_list_handle, 
>> &need_full_reset);
>> +            if (r && r == -EAGAIN)
>> +                goto retry;
>> +        }
>>       }
>>         /* Post ASIC reset for all devs .*/
>>       list_for_each_entry(tmp_adev, device_list_handle, gmc.xgmi.head) {
>> -        amdgpu_device_post_asic_reset(tmp_adev);
>> +        amdgpu_device_post_asic_reset(tmp_adev, job_signaled);
>>             if (r) {
>>               /* bad news, how to tell it to userspace ? */
>> @@ -3648,7 +3699,7 @@ int amdgpu_device_gpu_recover(struct 
>> amdgpu_device *adev,
>>           amdgpu_device_unlock_adev(tmp_adev);
>>       }
>>   -    if (hive && adev->gmc.xgmi.num_physical_nodes > 1)
>> +    if (xgmi_topology_present)
>>           mutex_unlock(&hive->reset_lock);
>>         if (r)
>
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