[PATCH] drm/amdgpu: move buffer funcs setting up a level
Alex Deucher
alexdeucher at gmail.com
Thu Oct 26 20:19:31 UTC 2023
Thanks!
On Thu, Oct 26, 2023 at 4:17 PM Luben Tuikov <ltuikov89 at gmail.com> wrote:
>
> Pushed to drm-misc-next.
>
> 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 at gmail.com> 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 at amd.com>
> >>>> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
> >>>
> >>> I don't know of hand if the high level function really cover everything,
> >>> so only Acked-by: Christian König <christian.koenig at amd.com> 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;
> >>>
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