[PATCH 02/11] drm/amdgpu: add ring flag for no user submissions
Rodrigo Siqueira
siqueira at igalia.com
Thu Mar 13 21:52:21 UTC 2025
On 03/13, Alex Deucher wrote:
> This would be set by IPs which only accept submissions
> from the kernel, not userspace, such as when kernel
> queues are disabled. Don't expose the rings to userspace
> and reject any submissions in the CS IOCTL.
Just out of curiosity, is CS == Command Submission?
>
> Reviewed-by: Sunil Khatri<sunil.khatri at amd.com>
> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 4 ++++
> drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 30 ++++++++++++++++--------
> drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h | 2 +-
> 3 files changed, 25 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
> index 5df21529b3b13..5cc18034b75df 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
> @@ -349,6 +349,10 @@ static int amdgpu_cs_p2_ib(struct amdgpu_cs_parser *p,
> ring = amdgpu_job_ring(job);
> ib = &job->ibs[job->num_ibs++];
>
> + /* submissions to kernel queus are disabled */
/queus/queues/
> + if (ring->no_user_submission)
> + return -EINVAL;
Since this will be set for ASICs that don't accept userspace
submissions, maybe -ENOTSUPP would be more accurate?
Thanks
> +
> /* MM engine doesn't support user fences */
> if (p->uf_bo && ring->funcs->no_user_fence)
> return -EINVAL;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> index cd6eb7a3bc58a..3b7dfd56ccd0e 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> @@ -408,7 +408,8 @@ static int amdgpu_hw_ip_info(struct amdgpu_device *adev,
> case AMDGPU_HW_IP_GFX:
> type = AMD_IP_BLOCK_TYPE_GFX;
> for (i = 0; i < adev->gfx.num_gfx_rings; i++)
> - if (adev->gfx.gfx_ring[i].sched.ready)
> + if (adev->gfx.gfx_ring[i].sched.ready &&
> + !adev->gfx.gfx_ring[i].no_user_submission)
> ++num_rings;
> ib_start_alignment = 32;
> ib_size_alignment = 32;
> @@ -416,7 +417,8 @@ static int amdgpu_hw_ip_info(struct amdgpu_device *adev,
> case AMDGPU_HW_IP_COMPUTE:
> type = AMD_IP_BLOCK_TYPE_GFX;
> for (i = 0; i < adev->gfx.num_compute_rings; i++)
> - if (adev->gfx.compute_ring[i].sched.ready)
> + if (adev->gfx.compute_ring[i].sched.ready &&
> + !adev->gfx.compute_ring[i].no_user_submission)
> ++num_rings;
> ib_start_alignment = 32;
> ib_size_alignment = 32;
> @@ -424,7 +426,8 @@ static int amdgpu_hw_ip_info(struct amdgpu_device *adev,
> case AMDGPU_HW_IP_DMA:
> type = AMD_IP_BLOCK_TYPE_SDMA;
> for (i = 0; i < adev->sdma.num_instances; i++)
> - if (adev->sdma.instance[i].ring.sched.ready)
> + if (adev->sdma.instance[i].ring.sched.ready &&
> + !adev->gfx.gfx_ring[i].no_user_submission)
> ++num_rings;
> ib_start_alignment = 256;
> ib_size_alignment = 4;
> @@ -435,7 +438,8 @@ static int amdgpu_hw_ip_info(struct amdgpu_device *adev,
> if (adev->uvd.harvest_config & (1 << i))
> continue;
>
> - if (adev->uvd.inst[i].ring.sched.ready)
> + if (adev->uvd.inst[i].ring.sched.ready &&
> + !adev->uvd.inst[i].ring.no_user_submission)
> ++num_rings;
> }
> ib_start_alignment = 256;
> @@ -444,7 +448,8 @@ static int amdgpu_hw_ip_info(struct amdgpu_device *adev,
> case AMDGPU_HW_IP_VCE:
> type = AMD_IP_BLOCK_TYPE_VCE;
> for (i = 0; i < adev->vce.num_rings; i++)
> - if (adev->vce.ring[i].sched.ready)
> + if (adev->vce.ring[i].sched.ready &&
> + !adev->vce.ring[i].no_user_submission)
> ++num_rings;
> ib_start_alignment = 256;
> ib_size_alignment = 4;
> @@ -456,7 +461,8 @@ static int amdgpu_hw_ip_info(struct amdgpu_device *adev,
> continue;
>
> for (j = 0; j < adev->uvd.num_enc_rings; j++)
> - if (adev->uvd.inst[i].ring_enc[j].sched.ready)
> + if (adev->uvd.inst[i].ring_enc[j].sched.ready &&
> + !adev->uvd.inst[i].ring_enc[j].no_user_submission)
> ++num_rings;
> }
> ib_start_alignment = 256;
> @@ -468,7 +474,8 @@ static int amdgpu_hw_ip_info(struct amdgpu_device *adev,
> if (adev->vcn.harvest_config & (1 << i))
> continue;
>
> - if (adev->vcn.inst[i].ring_dec.sched.ready)
> + if (adev->vcn.inst[i].ring_dec.sched.ready &&
> + !adev->vcn.inst[i].ring_dec.no_user_submission)
> ++num_rings;
> }
> ib_start_alignment = 256;
> @@ -481,7 +488,8 @@ static int amdgpu_hw_ip_info(struct amdgpu_device *adev,
> continue;
>
> for (j = 0; j < adev->vcn.inst[i].num_enc_rings; j++)
> - if (adev->vcn.inst[i].ring_enc[j].sched.ready)
> + if (adev->vcn.inst[i].ring_enc[j].sched.ready &&
> + !adev->vcn.inst[i].ring_enc[j].no_user_submission)
> ++num_rings;
> }
> ib_start_alignment = 256;
> @@ -496,7 +504,8 @@ static int amdgpu_hw_ip_info(struct amdgpu_device *adev,
> continue;
>
> for (j = 0; j < adev->jpeg.num_jpeg_rings; j++)
> - if (adev->jpeg.inst[i].ring_dec[j].sched.ready)
> + if (adev->jpeg.inst[i].ring_dec[j].sched.ready &&
> + !adev->jpeg.inst[i].ring_dec[j].no_user_submission)
> ++num_rings;
> }
> ib_start_alignment = 256;
> @@ -504,7 +513,8 @@ static int amdgpu_hw_ip_info(struct amdgpu_device *adev,
> break;
> case AMDGPU_HW_IP_VPE:
> type = AMD_IP_BLOCK_TYPE_VPE;
> - if (adev->vpe.ring.sched.ready)
> + if (adev->vpe.ring.sched.ready &&
> + !adev->vpe.ring.no_user_submission)
> ++num_rings;
> ib_start_alignment = 256;
> ib_size_alignment = 4;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
> index b4fd1e17205e9..4a97afcb38b78 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
> @@ -297,6 +297,7 @@ struct amdgpu_ring {
> struct dma_fence *vmid_wait;
> bool has_compute_vm_bug;
> bool no_scheduler;
> + bool no_user_submission;
> int hw_prio;
> unsigned num_hw_submission;
> atomic_t *sched_score;
> @@ -310,7 +311,6 @@ struct amdgpu_ring {
> unsigned int entry_index;
> /* store the cached rptr to restore after reset */
> uint64_t cached_rptr;
> -
> };
>
> #define amdgpu_ring_parse_cs(r, p, job, ib) ((r)->funcs->parse_cs((p), (job), (ib)))
> --
> 2.48.1
>
--
Rodrigo Siqueira
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