Re: [PATCH] drm/amdgpu: move buffer funcs setting up a level

[Christian König <ckoenig.leichtzumerken@xxxxxxxxx>]

This is only needed for certain UVD/VCE hardware/firmware versions.

Leo needs to decide that, but I would rather like to keep the call to 
create the entity in the HW IP specific files.

Regards,
Christian.

Am 07.11.23 um 15:47 schrieb Alex Deucher:
> On Tue, Nov 7, 2023 at 9:19 AM Alex Deucher <alexdeucher@xxxxxxxxx> wrote:
> > On Tue, Nov 7, 2023 at 5:52 AM Christian König
> > <ckoenig.leichtzumerken@xxxxxxxxx> wrote:
> > > Am 03.11.23 um 23:10 schrieb Alex Deucher:
> > > > On Fri, Nov 3, 2023 at 4:17 PM Alex Deucher <alexdeucher@xxxxxxxxx> wrote:
> > > > > On Thu, Oct 26, 2023 at 4:17 PM Luben Tuikov <ltuikov89@xxxxxxxxx> wrote:
> > > > > > Pushed to drm-misc-next.
> > > > > BTW, I'm seeing the following on older GPUs with VCE and UVD even with
> > > > > this patch:
> > > > > [   11.886024] amdgpu 0000:0a:00.0: [drm] *ERROR* drm_sched_job_init:
> > > > > entity has no rq!
> > > > > [   11.886028] amdgpu 0000:0a:00.0: [drm:amdgpu_ib_ring_tests
> > > > > [amdgpu]] *ERROR* IB test failed on uvd (-2).
> > > > > [   11.889927] amdgpu 0000:0a:00.0: [drm] *ERROR* drm_sched_job_init:
> > > > > entity has no rq!
> > > > > [   11.889930] amdgpu 0000:0a:00.0: [drm:amdgpu_ib_ring_tests
> > > > > [amdgpu]] *ERROR* IB test failed on vce0 (-2).
> > > > > [   11.890172] [drm:process_one_work] *ERROR* ib ring test failed (-2).
> > > > > Seems to be specific to UVD and VCE, I don't see anything similar with
> > > > > VCN, but the flows for both are pretty similar.  Not sure why we are
> > > > > not seeing it for VCN.  Just a heads up if you have any ideas.  Will
> > > > > take a closer look next week.
> > > > + Leo
> > > >
> > > > I found the problem.  We set up scheduling entities for UVD and VCE
> > > > specifically and not for any other engines.  I don't remember why
> > > > offhand.  I'm guessing maybe to deal with the session limits on UVD
> > > > and VCE?  If so I'm not sure of a clean way to fix this.
> > > I haven't looked through all my mails yet so could be that Leo has
> > > already answered this.
> > >
> > > The UVD/VCE entities are used for the older chips where applications
> > > have to use create/destroy messages to the firmware.
> > >
> > > If an application exits without cleaning up their handles the kernel
> > > sends the appropriate destroy messages itself. For an example see
> > > amdgpu_uvd_free_handles().
> > >
> > > We used to initialize those entities with separate calls after the
> > > scheduler had been brought up, see amdgpu_uvd_entity_init() for an example.
> > >
> > > But this was somehow messed up and we now do the call to
> > > amdgpu_uvd_entity_init() at the end of *_sw_init() instead of _late_init().
> > >
> > > I suggest to just come up with a function which can be used for the
> > > late_init() callback of the UVD/VCE blocks.
> > I guess the issue is that we only need to initialize the entity once
> > so sw_init makes sense.  All of the other functions get called at
> > resume time, etc.  I think we could probably put it into
> > amdgpu_device_init_schedulers() somehow.
> I think something like this might do the trick.
>
> Alex
>
> > Alex
> >
> > > Christian.
> > >
> > > > Alex
> > > >
> > > > > Alex
> > > > >
> > > > > > Regards,
> > > > > > Luben
> > > > > >
> > > > > > On 2023-10-26 15:52, Luben Tuikov wrote:
> > > > > > > On 2023-10-26 15:32, Alex Deucher wrote:
> > > > > > > > On Thu, Oct 26, 2023 at 2:22 AM Christian König
> > > > > > > > <ckoenig.leichtzumerken@xxxxxxxxx> wrote:
> > > > > > > > > Am 25.10.23 um 19:19 schrieb Alex Deucher:
> > > > > > > > > > Rather than doing this in the IP code for the SDMA paging
> > > > > > > > > > engine, move it up to the core device level init level.
> > > > > > > > > > This should fix the scheduler init ordering.
> > > > > > > > > >
> > > > > > > > > > v2: drop extra parens
> > > > > > > > > > v3: drop SDMA helpers
> > > > > > > > > >
> > > > > > > > > > Tested-by: Luben Tuikov <luben.tuikov@xxxxxxx>
> > > > > > > > > > Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
> > > > > > > > > I don't know of hand if the high level function really cover everything,
> > > > > > > > > so only Acked-by: Christian König <christian.koenig@xxxxxxx> for now.
> > > > > > > > Luben,
> > > > > > > >
> > > > > > > > Was this needed for some of the scheduler stuff that is pending?  If
> > > > > > > > you would rather take it via drm-misc to align with the scheduler
> > > > > > > > changes, that works for me, otherwise I can take it via the amdgpu
> > > > > > > > tree.
> > > > > > > Hi Alex,
> > > > > > >
> > > > > > > Yes, it does.
> > > > > > >
> > > > > > > I can take it via drm-misc-next as that where the scheduler changes landed.
> > > > > > >
> > > > > > > I'll add Christian's Acked-by.
> > > > > > >
> > > > > > > I'll add a Fixes tag because ideally it should've gone before the dynamic
> > > > > > > sched_rq commit.
> > > > > > >
> > > > > > > Thanks for the heads-up!
> > > > > > >
> > > > > > > Regards,
> > > > > > > Luben
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > > Thanks,
> > > > > > > >
> > > > > > > > Alex
> > > > > > > >
> > > > > > > >
> > > > > > > > > Christian.
> > > > > > > > >
> > > > > > > > > > ---
> > > > > > > > > >     drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 15 +++++++++++++++
> > > > > > > > > >     drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.c   | 21 ---------------------
> > > > > > > > > >     drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.h   |  1 -
> > > > > > > > > >     drivers/gpu/drm/amd/amdgpu/cik_sdma.c      |  5 -----
> > > > > > > > > >     drivers/gpu/drm/amd/amdgpu/sdma_v2_4.c     |  5 -----
> > > > > > > > > >     drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c     |  5 -----
> > > > > > > > > >     drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c     | 16 +---------------
> > > > > > > > > >     drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c     | 10 +---------
> > > > > > > > > >     drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c     | 10 +---------
> > > > > > > > > >     drivers/gpu/drm/amd/amdgpu/sdma_v6_0.c     | 10 +---------
> > > > > > > > > >     drivers/gpu/drm/amd/amdgpu/si_dma.c        |  5 -----
> > > > > > > > > >     11 files changed, 19 insertions(+), 84 deletions(-)
> > > > > > > > > >
> > > > > > > > > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > > > > > > > > > index 2031a467b721..5c90080e93ba 100644
> > > > > > > > > > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > > > > > > > > > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > > > > > > > > > @@ -2662,6 +2662,9 @@ static int amdgpu_device_ip_init(struct amdgpu_device *adev)
> > > > > > > > > >         if (r)
> > > > > > > > > >                 goto init_failed;
> > > > > > > > > >
> > > > > > > > > > +     if (adev->mman.buffer_funcs_ring->sched.ready)
> > > > > > > > > > +             amdgpu_ttm_set_buffer_funcs_status(adev, true);
> > > > > > > > > > +
> > > > > > > > > >         /* Don't init kfd if whole hive need to be reset during init */
> > > > > > > > > >         if (!adev->gmc.xgmi.pending_reset) {
> > > > > > > > > >                 kgd2kfd_init_zone_device(adev);
> > > > > > > > > > @@ -3260,6 +3263,8 @@ int amdgpu_device_ip_suspend(struct amdgpu_device *adev)
> > > > > > > > > >                 amdgpu_virt_request_full_gpu(adev, false);
> > > > > > > > > >         }
> > > > > > > > > >
> > > > > > > > > > +     amdgpu_ttm_set_buffer_funcs_status(adev, false);
> > > > > > > > > > +
> > > > > > > > > >         r = amdgpu_device_ip_suspend_phase1(adev);
> > > > > > > > > >         if (r)
> > > > > > > > > >                 return r;
> > > > > > > > > > @@ -3449,6 +3454,9 @@ static int amdgpu_device_ip_resume(struct amdgpu_device *adev)
> > > > > > > > > >
> > > > > > > > > >         r = amdgpu_device_ip_resume_phase2(adev);
> > > > > > > > > >
> > > > > > > > > > +     if (adev->mman.buffer_funcs_ring->sched.ready)
> > > > > > > > > > +             amdgpu_ttm_set_buffer_funcs_status(adev, true);
> > > > > > > > > > +
> > > > > > > > > >         return r;
> > > > > > > > > >     }
> > > > > > > > > >
> > > > > > > > > > @@ -4236,6 +4244,8 @@ void amdgpu_device_fini_hw(struct amdgpu_device *adev)
> > > > > > > > > >         /* disable ras feature must before hw fini */
> > > > > > > > > >         amdgpu_ras_pre_fini(adev);
> > > > > > > > > >
> > > > > > > > > > +     amdgpu_ttm_set_buffer_funcs_status(adev, false);
> > > > > > > > > > +
> > > > > > > > > >         amdgpu_device_ip_fini_early(adev);
> > > > > > > > > >
> > > > > > > > > >         amdgpu_irq_fini_hw(adev);
> > > > > > > > > > @@ -4407,6 +4417,8 @@ int amdgpu_device_suspend(struct drm_device *dev, bool fbcon)
> > > > > > > > > >
> > > > > > > > > >         amdgpu_ras_suspend(adev);
> > > > > > > > > >
> > > > > > > > > > +     amdgpu_ttm_set_buffer_funcs_status(adev, false);
> > > > > > > > > > +
> > > > > > > > > >         amdgpu_device_ip_suspend_phase1(adev);
> > > > > > > > > >
> > > > > > > > > >         if (!adev->in_s0ix)
> > > > > > > > > > @@ -5178,6 +5190,9 @@ int amdgpu_do_asic_reset(struct list_head *device_list_handle,
> > > > > > > > > >                                 if (r)
> > > > > > > > > >                                         goto out;
> > > > > > > > > >
> > > > > > > > > > +                             if (tmp_adev->mman.buffer_funcs_ring->sched.ready)
> > > > > > > > > > +                                     amdgpu_ttm_set_buffer_funcs_status(tmp_adev, true);
> > > > > > > > > > +
> > > > > > > > > >                                 if (vram_lost)
> > > > > > > > > >                                         amdgpu_device_fill_reset_magic(tmp_adev);
> > > > > > > > > >
> > > > > > > > > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.c
> > > > > > > > > > index e8cbc4142d80..1d9d187de6ee 100644
> > > > > > > > > > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.c
> > > > > > > > > > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.c
> > > > > > > > > > @@ -292,27 +292,6 @@ int amdgpu_sdma_init_microcode(struct amdgpu_device *adev,
> > > > > > > > > >         return err;
> > > > > > > > > >     }
> > > > > > > > > >
> > > > > > > > > > -void amdgpu_sdma_unset_buffer_funcs_helper(struct amdgpu_device *adev)
> > > > > > > > > > -{
> > > > > > > > > > -     struct amdgpu_ring *sdma;
> > > > > > > > > > -     int i;
> > > > > > > > > > -
> > > > > > > > > > -     for (i = 0; i < adev->sdma.num_instances; i++) {
> > > > > > > > > > -             if (adev->sdma.has_page_queue) {
> > > > > > > > > > -                     sdma = &adev->sdma.instance[i].page;
> > > > > > > > > > -                     if (adev->mman.buffer_funcs_ring == sdma) {
> > > > > > > > > > -                             amdgpu_ttm_set_buffer_funcs_status(adev, false);
> > > > > > > > > > -                             break;
> > > > > > > > > > -                     }
> > > > > > > > > > -             }
> > > > > > > > > > -             sdma = &adev->sdma.instance[i].ring;
> > > > > > > > > > -             if (adev->mman.buffer_funcs_ring == sdma) {
> > > > > > > > > > -                     amdgpu_ttm_set_buffer_funcs_status(adev, false);
> > > > > > > > > > -                     break;
> > > > > > > > > > -             }
> > > > > > > > > > -     }
> > > > > > > > > > -}
> > > > > > > > > > -
> > > > > > > > > >     int amdgpu_sdma_ras_sw_init(struct amdgpu_device *adev)
> > > > > > > > > >     {
> > > > > > > > > >         int err = 0;
> > > > > > > > > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.h
> > > > > > > > > > index 513ac22120c1..173a2a308078 100644
> > > > > > > > > > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.h
> > > > > > > > > > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.h
> > > > > > > > > > @@ -169,7 +169,6 @@ int amdgpu_sdma_init_microcode(struct amdgpu_device *adev, u32 instance,
> > > > > > > > > >                                bool duplicate);
> > > > > > > > > >     void amdgpu_sdma_destroy_inst_ctx(struct amdgpu_device *adev,
> > > > > > > > > >             bool duplicate);
> > > > > > > > > > -void amdgpu_sdma_unset_buffer_funcs_helper(struct amdgpu_device *adev);
> > > > > > > > > >     int amdgpu_sdma_ras_sw_init(struct amdgpu_device *adev);
> > > > > > > > > >
> > > > > > > > > >     #endif
> > > > > > > > > > diff --git a/drivers/gpu/drm/amd/amdgpu/cik_sdma.c b/drivers/gpu/drm/amd/amdgpu/cik_sdma.c
> > > > > > > > > > index ee5dce6f6043..a3fccc4c1f43 100644
> > > > > > > > > > --- a/drivers/gpu/drm/amd/amdgpu/cik_sdma.c
> > > > > > > > > > +++ b/drivers/gpu/drm/amd/amdgpu/cik_sdma.c
> > > > > > > > > > @@ -308,8 +308,6 @@ static void cik_sdma_gfx_stop(struct amdgpu_device *adev)
> > > > > > > > > >         u32 rb_cntl;
> > > > > > > > > >         int i;
> > > > > > > > > >
> > > > > > > > > > -     amdgpu_sdma_unset_buffer_funcs_helper(adev);
> > > > > > > > > > -
> > > > > > > > > >         for (i = 0; i < adev->sdma.num_instances; i++) {
> > > > > > > > > >                 rb_cntl = RREG32(mmSDMA0_GFX_RB_CNTL + sdma_offsets[i]);
> > > > > > > > > >                 rb_cntl &= ~SDMA0_GFX_RB_CNTL__RB_ENABLE_MASK;
> > > > > > > > > > @@ -498,9 +496,6 @@ static int cik_sdma_gfx_resume(struct amdgpu_device *adev)
> > > > > > > > > >                 r = amdgpu_ring_test_helper(ring);
> > > > > > > > > >                 if (r)
> > > > > > > > > >                         return r;
> > > > > > > > > > -
> > > > > > > > > > -             if (adev->mman.buffer_funcs_ring == ring)
> > > > > > > > > > -                     amdgpu_ttm_set_buffer_funcs_status(adev, true);
> > > > > > > > > >         }
> > > > > > > > > >
> > > > > > > > > >         return 0;
> > > > > > > > > > diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v2_4.c b/drivers/gpu/drm/amd/amdgpu/sdma_v2_4.c
> > > > > > > > > > index b58a13bd75db..45377a175250 100644
> > > > > > > > > > --- a/drivers/gpu/drm/amd/amdgpu/sdma_v2_4.c
> > > > > > > > > > +++ b/drivers/gpu/drm/amd/amdgpu/sdma_v2_4.c
> > > > > > > > > > @@ -339,8 +339,6 @@ static void sdma_v2_4_gfx_stop(struct amdgpu_device *adev)
> > > > > > > > > >         u32 rb_cntl, ib_cntl;
> > > > > > > > > >         int i;
> > > > > > > > > >
> > > > > > > > > > -     amdgpu_sdma_unset_buffer_funcs_helper(adev);
> > > > > > > > > > -
> > > > > > > > > >         for (i = 0; i < adev->sdma.num_instances; i++) {
> > > > > > > > > >                 rb_cntl = RREG32(mmSDMA0_GFX_RB_CNTL + sdma_offsets[i]);
> > > > > > > > > >                 rb_cntl = REG_SET_FIELD(rb_cntl, SDMA0_GFX_RB_CNTL, RB_ENABLE, 0);
> > > > > > > > > > @@ -474,9 +472,6 @@ static int sdma_v2_4_gfx_resume(struct amdgpu_device *adev)
> > > > > > > > > >                 r = amdgpu_ring_test_helper(ring);
> > > > > > > > > >                 if (r)
> > > > > > > > > >                         return r;
> > > > > > > > > > -
> > > > > > > > > > -             if (adev->mman.buffer_funcs_ring == ring)
> > > > > > > > > > -                     amdgpu_ttm_set_buffer_funcs_status(adev, true);
> > > > > > > > > >         }
> > > > > > > > > >
> > > > > > > > > >         return 0;
> > > > > > > > > > diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c b/drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c
> > > > > > > > > > index c5ea32687eb5..2ad615be4bb3 100644
> > > > > > > > > > --- a/drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c
> > > > > > > > > > +++ b/drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c
> > > > > > > > > > @@ -513,8 +513,6 @@ static void sdma_v3_0_gfx_stop(struct amdgpu_device *adev)
> > > > > > > > > >         u32 rb_cntl, ib_cntl;
> > > > > > > > > >         int i;
> > > > > > > > > >
> > > > > > > > > > -     amdgpu_sdma_unset_buffer_funcs_helper(adev);
> > > > > > > > > > -
> > > > > > > > > >         for (i = 0; i < adev->sdma.num_instances; i++) {
> > > > > > > > > >                 rb_cntl = RREG32(mmSDMA0_GFX_RB_CNTL + sdma_offsets[i]);
> > > > > > > > > >                 rb_cntl = REG_SET_FIELD(rb_cntl, SDMA0_GFX_RB_CNTL, RB_ENABLE, 0);
> > > > > > > > > > @@ -746,9 +744,6 @@ static int sdma_v3_0_gfx_resume(struct amdgpu_device *adev)
> > > > > > > > > >                 r = amdgpu_ring_test_helper(ring);
> > > > > > > > > >                 if (r)
> > > > > > > > > >                         return r;
> > > > > > > > > > -
> > > > > > > > > > -             if (adev->mman.buffer_funcs_ring == ring)
> > > > > > > > > > -                     amdgpu_ttm_set_buffer_funcs_status(adev, true);
> > > > > > > > > >         }
> > > > > > > > > >
> > > > > > > > > >         return 0;
> > > > > > > > > > diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c b/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
> > > > > > > > > > index 683d51ae4bf1..3d68dd5523c6 100644
> > > > > > > > > > --- a/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
> > > > > > > > > > +++ b/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
> > > > > > > > > > @@ -877,8 +877,6 @@ static void sdma_v4_0_gfx_enable(struct amdgpu_device *adev, bool enable)
> > > > > > > > > >         u32 rb_cntl, ib_cntl;
> > > > > > > > > >         int i;
> > > > > > > > > >
> > > > > > > > > > -     amdgpu_sdma_unset_buffer_funcs_helper(adev);
> > > > > > > > > > -
> > > > > > > > > >         for (i = 0; i < adev->sdma.num_instances; i++) {
> > > > > > > > > >                 rb_cntl = RREG32_SDMA(i, mmSDMA0_GFX_RB_CNTL);
> > > > > > > > > >                 rb_cntl = REG_SET_FIELD(rb_cntl, SDMA0_GFX_RB_CNTL, RB_ENABLE, enable ? 1 : 0);
> > > > > > > > > > @@ -913,8 +911,6 @@ static void sdma_v4_0_page_stop(struct amdgpu_device *adev)
> > > > > > > > > >         u32 rb_cntl, ib_cntl;
> > > > > > > > > >         int i;
> > > > > > > > > >
> > > > > > > > > > -     amdgpu_sdma_unset_buffer_funcs_helper(adev);
> > > > > > > > > > -
> > > > > > > > > >         for (i = 0; i < adev->sdma.num_instances; i++) {
> > > > > > > > > >                 rb_cntl = RREG32_SDMA(i, mmSDMA0_PAGE_RB_CNTL);
> > > > > > > > > >                 rb_cntl = REG_SET_FIELD(rb_cntl, SDMA0_PAGE_RB_CNTL,
> > > > > > > > > > @@ -1402,13 +1398,7 @@ static int sdma_v4_0_start(struct amdgpu_device *adev)
> > > > > > > > > >                         r = amdgpu_ring_test_helper(page);
> > > > > > > > > >                         if (r)
> > > > > > > > > >                                 return r;
> > > > > > > > > > -
> > > > > > > > > > -                     if (adev->mman.buffer_funcs_ring == page)
> > > > > > > > > > -                             amdgpu_ttm_set_buffer_funcs_status(adev, true);
> > > > > > > > > >                 }
> > > > > > > > > > -
> > > > > > > > > > -             if (adev->mman.buffer_funcs_ring == ring)
> > > > > > > > > > -                     amdgpu_ttm_set_buffer_funcs_status(adev, true);
> > > > > > > > > >         }
> > > > > > > > > >
> > > > > > > > > >         return r;
> > > > > > > > > > @@ -1921,11 +1911,8 @@ static int sdma_v4_0_hw_fini(void *handle)
> > > > > > > > > >         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
> > > > > > > > > >         int i;
> > > > > > > > > >
> > > > > > > > > > -     if (amdgpu_sriov_vf(adev)) {
> > > > > > > > > > -             /* disable the scheduler for SDMA */
> > > > > > > > > > -             amdgpu_sdma_unset_buffer_funcs_helper(adev);
> > > > > > > > > > +     if (amdgpu_sriov_vf(adev))
> > > > > > > > > >                 return 0;
> > > > > > > > > > -     }
> > > > > > > > > >
> > > > > > > > > >         if (amdgpu_ras_is_supported(adev, AMDGPU_RAS_BLOCK__SDMA)) {
> > > > > > > > > >                 for (i = 0; i < adev->sdma.num_instances; i++) {
> > > > > > > > > > @@ -1964,7 +1951,6 @@ static int sdma_v4_0_resume(void *handle)
> > > > > > > > > >         if (adev->in_s0ix) {
> > > > > > > > > >                 sdma_v4_0_enable(adev, true);
> > > > > > > > > >                 sdma_v4_0_gfx_enable(adev, true);
> > > > > > > > > > -             amdgpu_ttm_set_buffer_funcs_status(adev, true);
> > > > > > > > > >                 return 0;
> > > > > > > > > >         }
> > > > > > > > > >
> > > > > > > > > > diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c b/drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c
> > > > > > > > > > index be5d099c9898..c78027ebdcb9 100644
> > > > > > > > > > --- a/drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c
> > > > > > > > > > +++ b/drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c
> > > > > > > > > > @@ -559,8 +559,6 @@ static void sdma_v5_0_gfx_stop(struct amdgpu_device *adev)
> > > > > > > > > >         u32 rb_cntl, ib_cntl;
> > > > > > > > > >         int i;
> > > > > > > > > >
> > > > > > > > > > -     amdgpu_sdma_unset_buffer_funcs_helper(adev);
> > > > > > > > > > -
> > > > > > > > > >         for (i = 0; i < adev->sdma.num_instances; i++) {
> > > > > > > > > >                 rb_cntl = RREG32_SOC15_IP(GC, sdma_v5_0_get_reg_offset(adev, i, mmSDMA0_GFX_RB_CNTL));
> > > > > > > > > >                 rb_cntl = REG_SET_FIELD(rb_cntl, SDMA0_GFX_RB_CNTL, RB_ENABLE, 0);
> > > > > > > > > > @@ -825,9 +823,6 @@ static int sdma_v5_0_gfx_resume(struct amdgpu_device *adev)
> > > > > > > > > >                 r = amdgpu_ring_test_helper(ring);
> > > > > > > > > >                 if (r)
> > > > > > > > > >                         return r;
> > > > > > > > > > -
> > > > > > > > > > -             if (adev->mman.buffer_funcs_ring == ring)
> > > > > > > > > > -                     amdgpu_ttm_set_buffer_funcs_status(adev, true);
> > > > > > > > > >         }
> > > > > > > > > >
> > > > > > > > > >         return 0;
> > > > > > > > > > @@ -1426,11 +1421,8 @@ static int sdma_v5_0_hw_fini(void *handle)
> > > > > > > > > >     {
> > > > > > > > > >         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
> > > > > > > > > >
> > > > > > > > > > -     if (amdgpu_sriov_vf(adev)) {
> > > > > > > > > > -             /* disable the scheduler for SDMA */
> > > > > > > > > > -             amdgpu_sdma_unset_buffer_funcs_helper(adev);
> > > > > > > > > > +     if (amdgpu_sriov_vf(adev))
> > > > > > > > > >                 return 0;
> > > > > > > > > > -     }
> > > > > > > > > >
> > > > > > > > > >         sdma_v5_0_ctx_switch_enable(adev, false);
> > > > > > > > > >         sdma_v5_0_enable(adev, false);
> > > > > > > > > > diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c b/drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c
> > > > > > > > > > index a3e8b10c071c..2e35f3571774 100644
> > > > > > > > > > --- a/drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c
> > > > > > > > > > +++ b/drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c
> > > > > > > > > > @@ -364,8 +364,6 @@ static void sdma_v5_2_gfx_stop(struct amdgpu_device *adev)
> > > > > > > > > >         u32 rb_cntl, ib_cntl;
> > > > > > > > > >         int i;
> > > > > > > > > >
> > > > > > > > > > -     amdgpu_sdma_unset_buffer_funcs_helper(adev);
> > > > > > > > > > -
> > > > > > > > > >         for (i = 0; i < adev->sdma.num_instances; i++) {
> > > > > > > > > >                 rb_cntl = RREG32_SOC15_IP(GC, sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_RB_CNTL));
> > > > > > > > > >                 rb_cntl = REG_SET_FIELD(rb_cntl, SDMA0_GFX_RB_CNTL, RB_ENABLE, 0);
> > > > > > > > > > @@ -625,9 +623,6 @@ static int sdma_v5_2_gfx_resume(struct amdgpu_device *adev)
> > > > > > > > > >                 r = amdgpu_ring_test_helper(ring);
> > > > > > > > > >                 if (r)
> > > > > > > > > >                         return r;
> > > > > > > > > > -
> > > > > > > > > > -             if (adev->mman.buffer_funcs_ring == ring)
> > > > > > > > > > -                     amdgpu_ttm_set_buffer_funcs_status(adev, true);
> > > > > > > > > >         }
> > > > > > > > > >
> > > > > > > > > >         return 0;
> > > > > > > > > > @@ -1284,11 +1279,8 @@ static int sdma_v5_2_hw_fini(void *handle)
> > > > > > > > > >     {
> > > > > > > > > >         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
> > > > > > > > > >
> > > > > > > > > > -     if (amdgpu_sriov_vf(adev)) {
> > > > > > > > > > -             /* disable the scheduler for SDMA */
> > > > > > > > > > -             amdgpu_sdma_unset_buffer_funcs_helper(adev);
> > > > > > > > > > +     if (amdgpu_sriov_vf(adev))
> > > > > > > > > >                 return 0;
> > > > > > > > > > -     }
> > > > > > > > > >
> > > > > > > > > >         sdma_v5_2_ctx_switch_enable(adev, false);
> > > > > > > > > >         sdma_v5_2_enable(adev, false);
> > > > > > > > > > diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v6_0.c b/drivers/gpu/drm/amd/amdgpu/sdma_v6_0.c
> > > > > > > > > > index 445a34549d2c..1c6ff511f501 100644
> > > > > > > > > > --- a/drivers/gpu/drm/amd/amdgpu/sdma_v6_0.c
> > > > > > > > > > +++ b/drivers/gpu/drm/amd/amdgpu/sdma_v6_0.c
> > > > > > > > > > @@ -348,8 +348,6 @@ static void sdma_v6_0_gfx_stop(struct amdgpu_device *adev)
> > > > > > > > > >         u32 rb_cntl, ib_cntl;
> > > > > > > > > >         int i;
> > > > > > > > > >
> > > > > > > > > > -     amdgpu_sdma_unset_buffer_funcs_helper(adev);
> > > > > > > > > > -
> > > > > > > > > >         for (i = 0; i < adev->sdma.num_instances; i++) {
> > > > > > > > > >                 rb_cntl = RREG32_SOC15_IP(GC, sdma_v6_0_get_reg_offset(adev, i, regSDMA0_QUEUE0_RB_CNTL));
> > > > > > > > > >                 rb_cntl = REG_SET_FIELD(rb_cntl, SDMA0_QUEUE0_RB_CNTL, RB_ENABLE, 0);
> > > > > > > > > > @@ -561,9 +559,6 @@ static int sdma_v6_0_gfx_resume(struct amdgpu_device *adev)
> > > > > > > > > >                 r = amdgpu_ring_test_helper(ring);
> > > > > > > > > >                 if (r)
> > > > > > > > > >                         return r;
> > > > > > > > > > -
> > > > > > > > > > -             if (adev->mman.buffer_funcs_ring == ring)
> > > > > > > > > > -                     amdgpu_ttm_set_buffer_funcs_status(adev, true);
> > > > > > > > > >         }
> > > > > > > > > >
> > > > > > > > > >         return 0;
> > > > > > > > > > @@ -1308,11 +1303,8 @@ static int sdma_v6_0_hw_fini(void *handle)
> > > > > > > > > >     {
> > > > > > > > > >         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
> > > > > > > > > >
> > > > > > > > > > -     if (amdgpu_sriov_vf(adev)) {
> > > > > > > > > > -             /* disable the scheduler for SDMA */
> > > > > > > > > > -             amdgpu_sdma_unset_buffer_funcs_helper(adev);
> > > > > > > > > > +     if (amdgpu_sriov_vf(adev))
> > > > > > > > > >                 return 0;
> > > > > > > > > > -     }
> > > > > > > > > >
> > > > > > > > > >         sdma_v6_0_ctxempty_int_enable(adev, false);
> > > > > > > > > >         sdma_v6_0_enable(adev, false);
> > > > > > > > > > diff --git a/drivers/gpu/drm/amd/amdgpu/si_dma.c b/drivers/gpu/drm/amd/amdgpu/si_dma.c
> > > > > > > > > > index 42c4547f32ec..9aa0e11ee673 100644
> > > > > > > > > > --- a/drivers/gpu/drm/amd/amdgpu/si_dma.c
> > > > > > > > > > +++ b/drivers/gpu/drm/amd/amdgpu/si_dma.c
> > > > > > > > > > @@ -115,8 +115,6 @@ static void si_dma_stop(struct amdgpu_device *adev)
> > > > > > > > > >         u32 rb_cntl;
> > > > > > > > > >         unsigned i;
> > > > > > > > > >
> > > > > > > > > > -     amdgpu_sdma_unset_buffer_funcs_helper(adev);
> > > > > > > > > > -
> > > > > > > > > >         for (i = 0; i < adev->sdma.num_instances; i++) {
> > > > > > > > > >                 /* dma0 */
> > > > > > > > > >                 rb_cntl = RREG32(DMA_RB_CNTL + sdma_offsets[i]);
> > > > > > > > > > @@ -177,9 +175,6 @@ static int si_dma_start(struct amdgpu_device *adev)
> > > > > > > > > >                 r = amdgpu_ring_test_helper(ring);
> > > > > > > > > >                 if (r)
> > > > > > > > > >                         return r;
> > > > > > > > > > -
> > > > > > > > > > -             if (adev->mman.buffer_funcs_ring == ring)
> > > > > > > > > > -                     amdgpu_ttm_set_buffer_funcs_status(adev, true);
> > > > > > > > > >         }
> > > > > > > > > >
> > > > > > > > > >         return 0;