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Date: Fri, 5 Mar 2021 14:48:26 +0000
From: "Deucher, Alexander" <Alexander.Deucher@....com>
To: "Koenig, Christian" <Christian.Koenig@....com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC: "stable@...r.kernel.org" <stable@...r.kernel.org>,
"Das, Nirmoy" <Nirmoy.Das@....com>, Sasha Levin <sashal@...nel.org>
Subject: RE: [PATCH 5.11 079/104] drm/amdgpu: enable only one high prio
compute queue
[AMD Public Use]
> -----Original Message-----
> From: Koenig, Christian <Christian.Koenig@....com>
> Sent: Friday, March 5, 2021 8:03 AM
> To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>; linux-
> kernel@...r.kernel.org
> Cc: stable@...r.kernel.org; Das, Nirmoy <Nirmoy.Das@....com>; Deucher,
> Alexander <Alexander.Deucher@....com>; Sasha Levin
> <sashal@...nel.org>
> Subject: Re: [PATCH 5.11 079/104] drm/amdgpu: enable only one high prio
> compute queue
>
> Mhm, I'm not sure this one needs to be backported.
>
> Why did you pick it up Greg?
It was picked up by Sasha's fixes checker.
Alex
>
> Thanks,
> Christian.
>
> Am 05.03.21 um 13:21 schrieb Greg Kroah-Hartman:
> > From: Nirmoy Das <nirmoy.das@....com>
> >
> > [ Upstream commit 8c0225d79273968a65e73a4204fba023ae02714d ]
> >
> > For high priority compute to work properly we need to enable wave
> > limiting on gfx pipe. Wave limiting is done through writing into
> > mmSPI_WCL_PIPE_PERCENT_GFX register. Enable only one high priority
> > compute queue to avoid race condition between multiple high priority
> > compute queues writing that register simultaneously.
> >
> > Signed-off-by: Nirmoy Das <nirmoy.das@....com>
> > Acked-by: Christian König <christian.koenig@....com>
> > Reviewed-by: Alex Deucher <alexander.deucher@....com>
> > Signed-off-by: Alex Deucher <alexander.deucher@....com>
> > Signed-off-by: Sasha Levin <sashal@...nel.org>
> > ---
> > drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c | 15 ++++++++-------
> > drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h | 2 +-
> > drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c | 6 ++----
> > drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c | 6 ++----
> > drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c | 7 ++-----
> > 5 files changed, 15 insertions(+), 21 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
> > b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
> > index cd2c676a2797..8e0a6c62322e 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
> > @@ -193,15 +193,16 @@ static bool
> amdgpu_gfx_is_multipipe_capable(struct amdgpu_device *adev)
> > }
> >
> > bool amdgpu_gfx_is_high_priority_compute_queue(struct
> amdgpu_device *adev,
> > - int pipe, int queue)
> > + struct amdgpu_ring *ring)
> > {
> > - bool multipipe_policy = amdgpu_gfx_is_multipipe_capable(adev);
> > - int cond;
> > - /* Policy: alternate between normal and high priority */
> > - cond = multipipe_policy ? pipe : queue;
> > -
> > - return ((cond % 2) != 0);
> > + /* Policy: use 1st queue as high priority compute queue if we
> > + * have more than one compute queue.
> > + */
> > + if (adev->gfx.num_compute_rings > 1 &&
> > + ring == &adev->gfx.compute_ring[0])
> > + return true;
> >
> > + return false;
> > }
> >
> > void amdgpu_gfx_compute_queue_acquire(struct amdgpu_device
> *adev)
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h
> > b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h
> > index 6b5a8f4642cc..72dbcd2bc6a6 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h
> > @@ -380,7 +380,7 @@ void
> amdgpu_queue_mask_bit_to_mec_queue(struct amdgpu_device *adev, int
> bit,
> > bool amdgpu_gfx_is_mec_queue_enabled(struct amdgpu_device *adev,
> int mec,
> > int pipe, int queue);
> > bool amdgpu_gfx_is_high_priority_compute_queue(struct
> amdgpu_device *adev,
> > - int pipe, int queue);
> > + struct amdgpu_ring *ring);
> > int amdgpu_gfx_me_queue_to_bit(struct amdgpu_device *adev, int me,
> > int pipe, int queue);
> > void amdgpu_gfx_bit_to_me_queue(struct amdgpu_device *adev, int
> bit,
> > diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
> > b/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
> > index e7d6da05011f..3a291befcddc 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
> > @@ -4495,8 +4495,7 @@ static int gfx_v10_0_compute_ring_init(struct
> amdgpu_device *adev, int ring_id,
> > irq_type = AMDGPU_CP_IRQ_COMPUTE_MEC1_PIPE0_EOP
> > + ((ring->me - 1) * adev->gfx.mec.num_pipe_per_mec)
> > + ring->pipe;
> > - hw_prio = amdgpu_gfx_is_high_priority_compute_queue(adev,
> ring->pipe,
> > - ring->queue) ?
> > + hw_prio = amdgpu_gfx_is_high_priority_compute_queue(adev,
> ring) ?
> > AMDGPU_GFX_PIPE_PRIO_HIGH :
> AMDGPU_GFX_PIPE_PRIO_NORMAL;
> > /* type-2 packets are deprecated on MEC, use type-3 instead */
> > r = amdgpu_ring_init(adev, ring, 1024, @@ -6545,8 +6544,7 @@ static
> > void gfx_v10_0_compute_mqd_set_priority(struct amdgpu_ring *ring,
> struct
> > struct amdgpu_device *adev = ring->adev;
> >
> > if (ring->funcs->type == AMDGPU_RING_TYPE_COMPUTE) {
> > - if (amdgpu_gfx_is_high_priority_compute_queue(adev,
> ring->pipe,
> > - ring->queue)) {
> > + if (amdgpu_gfx_is_high_priority_compute_queue(adev,
> ring)) {
> > mqd->cp_hqd_pipe_priority =
> AMDGPU_GFX_PIPE_PRIO_HIGH;
> > mqd->cp_hqd_queue_priority =
> >
> AMDGPU_GFX_QUEUE_PRIORITY_MAXIMUM;
> > diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
> > b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
> > index 37639214cbbb..b0284c4659ba 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
> > @@ -1923,8 +1923,7 @@ static int gfx_v8_0_compute_ring_init(struct
> amdgpu_device *adev, int ring_id,
> > + ((ring->me - 1) * adev->gfx.mec.num_pipe_per_mec)
> > + ring->pipe;
> >
> > - hw_prio = amdgpu_gfx_is_high_priority_compute_queue(adev,
> ring->pipe,
> > - ring->queue) ?
> > + hw_prio = amdgpu_gfx_is_high_priority_compute_queue(adev,
> ring) ?
> > AMDGPU_GFX_PIPE_PRIO_HIGH :
> AMDGPU_RING_PRIO_DEFAULT;
> > /* type-2 packets are deprecated on MEC, use type-3 instead */
> > r = amdgpu_ring_init(adev, ring, 1024, @@ -4442,8 +4441,7 @@ static
> > void gfx_v8_0_mqd_set_priority(struct amdgpu_ring *ring, struct vi_mqd
> *m
> > struct amdgpu_device *adev = ring->adev;
> >
> > if (ring->funcs->type == AMDGPU_RING_TYPE_COMPUTE) {
> > - if (amdgpu_gfx_is_high_priority_compute_queue(adev,
> ring->pipe,
> > - ring->queue)) {
> > + if (amdgpu_gfx_is_high_priority_compute_queue(adev,
> ring)) {
> > mqd->cp_hqd_pipe_priority =
> AMDGPU_GFX_PIPE_PRIO_HIGH;
> > mqd->cp_hqd_queue_priority =
> >
> AMDGPU_GFX_QUEUE_PRIORITY_MAXIMUM;
> > diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
> > b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
> > index 5f4805e4d04a..3e800193a604 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
> > @@ -2228,8 +2228,7 @@ static int gfx_v9_0_compute_ring_init(struct
> amdgpu_device *adev, int ring_id,
> > irq_type = AMDGPU_CP_IRQ_COMPUTE_MEC1_PIPE0_EOP
> > + ((ring->me - 1) * adev->gfx.mec.num_pipe_per_mec)
> > + ring->pipe;
> > - hw_prio = amdgpu_gfx_is_high_priority_compute_queue(adev,
> ring->pipe,
> > - ring->queue) ?
> > + hw_prio = amdgpu_gfx_is_high_priority_compute_queue(adev,
> ring) ?
> > AMDGPU_GFX_PIPE_PRIO_HIGH :
> AMDGPU_GFX_PIPE_PRIO_NORMAL;
> > /* type-2 packets are deprecated on MEC, use type-3 instead */
> > return amdgpu_ring_init(adev, ring, 1024, @@ -3391,9 +3390,7 @@
> > static void gfx_v9_0_mqd_set_priority(struct amdgpu_ring *ring, struct
> v9_mqd *m
> > struct amdgpu_device *adev = ring->adev;
> >
> > if (ring->funcs->type == AMDGPU_RING_TYPE_COMPUTE) {
> > - if (amdgpu_gfx_is_high_priority_compute_queue(adev,
> > - ring->pipe,
> > - ring->queue)) {
> > + if (amdgpu_gfx_is_high_priority_compute_queue(adev,
> ring)) {
> > mqd->cp_hqd_pipe_priority =
> AMDGPU_GFX_PIPE_PRIO_HIGH;
> > mqd->cp_hqd_queue_priority =
> >
> AMDGPU_GFX_QUEUE_PRIORITY_MAXIMUM;
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