[PATCH 3/4] drm/amdgpu: Avoid HW reset if guilty job already signaled.
Christian König
ckoenig.leichtzumerken at gmail.com
Fri Apr 12 07:39:03 UTC 2019
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 at amd.com>
> ---
> 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?
> +
> /*
> - * 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.
> +
> +
> + /* 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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