Re: [PATCH 14/15] drm/amdgpu/ring: move debugfs init into core amdgpu debugfs

[Alex Deucher <alexdeucher@gmail.com>]

On Thu, Feb 13, 2020 at 5:17 AM Christian König
<christian.koenig@amd.com> wrote:
>
> Am 13.02.20 um 10:54 schrieb Daniel Vetter:
> > On Fri, Feb 07, 2020 at 02:50:57PM -0500, Alex Deucher wrote:
> >> In order to remove the load and unload drm callbacks,
> >> we need to reorder the init sequence to move all the drm
> >> debugfs file handling.  Do this for rings.
> >>
> >> Acked-by: Christian König <christian.koenig@amd.com>
> >> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
> >> ---
> >>   drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c | 23 ++++++++++++++++++++-
> >>   drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c    | 15 +++-----------
> >>   drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h    |  4 ++++
> >>   3 files changed, 29 insertions(+), 13 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
> >> index df3919ef886b..7379910790c9 100644
> >> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
> >> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
> >> @@ -1218,7 +1218,7 @@ DEFINE_SIMPLE_ATTRIBUTE(fops_ib_preempt, NULL,
> >>
> >>   int amdgpu_debugfs_init(struct amdgpu_device *adev)
> >>   {
> >> -    int r;
> >> +    int r, i;
> >>
> >>      adev->debugfs_preempt =
> >>              debugfs_create_file("amdgpu_preempt_ib", 0600,
> >> @@ -1268,12 +1268,33 @@ int amdgpu_debugfs_init(struct amdgpu_device *adev)
> >>      }
> >>   #endif
> >>
> >> +    for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
> >> +            struct amdgpu_ring *ring = adev->rings[i];
> >> +
> >> +            if (!ring)
> >> +                    continue;
> >> +
> >> +            if (amdgpu_debugfs_ring_init(adev, ring)) {
> >> +                    DRM_ERROR("Failed to register debugfs file for rings !\n");
> >> +            }
> >> +    }
> >> +
> >>      return amdgpu_debugfs_add_files(adev, amdgpu_debugfs_list,
> >>                                      ARRAY_SIZE(amdgpu_debugfs_list));
> >>   }
> >>
> >>   void amdgpu_debugfs_fini(struct amdgpu_device *adev)
> > btw debugfs_fini shouldn't be needed anymore, Greg KH removed this all.
> > drm core removes all debugfs files recusrively for you, there should be 0
> > need for debugfs cleanup.
>
> Oh, yes please. Removing that was on my TODO list for an eternity as well.
>
> >
> > Also at least my tree doesn't even have this, where does this apply to?
>
> I would guess amd-staging-drm-next, but it might be that Alex is waiting
> for the next rebase to land.
>

Patches are against my drm-next branch which is based on fdo drm-next.
There are a number of files which the driver creates directly rather
than through drm.

Alex

> Christian.
>
> > -Daniel
> >
> >>   {
> >> +    int i;
> >> +
> >> +    for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
> >> +            struct amdgpu_ring *ring = adev->rings[i];
> >> +
> >> +            if (!ring)
> >> +                    continue;
> >> +
> >> +            amdgpu_debugfs_ring_fini(ring);
> >> +    }
> >>      amdgpu_ttm_debugfs_fini(adev);
> >>      debugfs_remove(adev->debugfs_preempt);
> >>   }
> >> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
> >> index e5c83e164d82..539be138260e 100644
> >> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
> >> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
> >> @@ -48,9 +48,6 @@
> >>    * wptr.  The GPU then starts fetching commands and executes
> >>    * them until the pointers are equal again.
> >>    */
> >> -static int amdgpu_debugfs_ring_init(struct amdgpu_device *adev,
> >> -                                struct amdgpu_ring *ring);
> >> -static void amdgpu_debugfs_ring_fini(struct amdgpu_ring *ring);
> >>
> >>   /**
> >>    * amdgpu_ring_alloc - allocate space on the ring buffer
> >> @@ -334,10 +331,6 @@ int amdgpu_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring,
> >>      for (i = 0; i < DRM_SCHED_PRIORITY_MAX; ++i)
> >>              atomic_set(&ring->num_jobs[i], 0);
> >>
> >> -    if (amdgpu_debugfs_ring_init(adev, ring)) {
> >> -            DRM_ERROR("Failed to register debugfs file for rings !\n");
> >> -    }
> >> -
> >>      return 0;
> >>   }
> >>
> >> @@ -367,8 +360,6 @@ void amdgpu_ring_fini(struct amdgpu_ring *ring)
> >>                            &ring->gpu_addr,
> >>                            (void **)&ring->ring);
> >>
> >> -    amdgpu_debugfs_ring_fini(ring);
> >> -
> >>      dma_fence_put(ring->vmid_wait);
> >>      ring->vmid_wait = NULL;
> >>      ring->me = 0;
> >> @@ -485,8 +476,8 @@ static const struct file_operations amdgpu_debugfs_ring_fops = {
> >>
> >>   #endif
> >>
> >> -static int amdgpu_debugfs_ring_init(struct amdgpu_device *adev,
> >> -                                struct amdgpu_ring *ring)
> >> +int amdgpu_debugfs_ring_init(struct amdgpu_device *adev,
> >> +                         struct amdgpu_ring *ring)
> >>   {
> >>   #if defined(CONFIG_DEBUG_FS)
> >>      struct drm_minor *minor = adev->ddev->primary;
> >> @@ -507,7 +498,7 @@ static int amdgpu_debugfs_ring_init(struct amdgpu_device *adev,
> >>      return 0;
> >>   }
> >>
> >> -static void amdgpu_debugfs_ring_fini(struct amdgpu_ring *ring)
> >> +void amdgpu_debugfs_ring_fini(struct amdgpu_ring *ring)
> >>   {
> >>   #if defined(CONFIG_DEBUG_FS)
> >>      debugfs_remove(ring->ent);
> >> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
> >> index 5134d0dd6dc2..0d098dafd23c 100644
> >> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
> >> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
> >> @@ -329,4 +329,8 @@ static inline void amdgpu_ring_write_multiple(struct amdgpu_ring *ring,
> >>
> >>   int amdgpu_ring_test_helper(struct amdgpu_ring *ring);
> >>
> >> +int amdgpu_debugfs_ring_init(struct amdgpu_device *adev,
> >> +                         struct amdgpu_ring *ring);
> >> +void amdgpu_debugfs_ring_fini(struct amdgpu_ring *ring);
> >> +
> >>   #endif
> >> --
> >> 2.24.1
> >>
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