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Message-ID: <13184e3e-7d13-4f28-9735-b984e89892b6@amd.com>
Date: Fri, 30 Jan 2026 13:56:12 +0100
From: Christian König <christian.koenig@....com>
To: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@....com>,
Alex Deucher <alexander.deucher@....com>, David Airlie <airlied@...il.com>,
Simona Vetter <simona@...ll.ch>
Cc: amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 05/12] amdgpu/vce: use amdgpu_gtt_mgr_alloc_entries
On 1/29/26 16:33, Pierre-Eric Pelloux-Prayer wrote:
> Instead of reserving a number of GTT pages for VCE 1.0 this
> commit now uses amdgpu_gtt_mgr_alloc_entries to allocate
> the pages when initializing vce 1.0.
>
> While at it remove the "does the VCPU BO already have a
> 32-bit address" check as suggested by Timur.
>
> This decouples vce init from gtt init.
>
> ---
> v7: renamed variables (Christian)
> ---
>
> Signed-off-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@....com>
Reviewed-by: Christian König <christian.koenig@....com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c | 1 -
> drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c | 18 -----------
> drivers/gpu/drm/amd/amdgpu/amdgpu_vce.h | 2 +-
> drivers/gpu/drm/amd/amdgpu/vce_v1_0.c | 33 +++++++++++----------
> 4 files changed, 18 insertions(+), 36 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
> index dd9b845d5783..f2e89fb4b666 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
> @@ -332,7 +332,6 @@ int amdgpu_gtt_mgr_init(struct amdgpu_device *adev, uint64_t gtt_size)
> ttm_resource_manager_init(man, &adev->mman.bdev, gtt_size);
>
> start = AMDGPU_GTT_MAX_TRANSFER_SIZE * AMDGPU_GTT_NUM_TRANSFER_WINDOWS;
> - start += amdgpu_vce_required_gart_pages(adev);
> size = (adev->gmc.gart_size >> PAGE_SHIFT) - start;
> drm_mm_init(&mgr->mm, start, size);
> spin_lock_init(&mgr->lock);
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c
> index a7d8f1ce6ac2..eb4a15db2ef2 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c
> @@ -450,24 +450,6 @@ void amdgpu_vce_free_handles(struct amdgpu_device *adev, struct drm_file *filp)
> }
> }
>
> -/**
> - * amdgpu_vce_required_gart_pages() - gets number of GART pages required by VCE
> - *
> - * @adev: amdgpu_device pointer
> - *
> - * Returns how many GART pages we need before GTT for the VCE IP block.
> - * For VCE1, see vce_v1_0_ensure_vcpu_bo_32bit_addr for details.
> - * For VCE2+, this is not needed so return zero.
> - */
> -u32 amdgpu_vce_required_gart_pages(struct amdgpu_device *adev)
> -{
> - /* VCE IP block not added yet, so can't use amdgpu_ip_version */
> - if (adev->family == AMDGPU_FAMILY_SI)
> - return 512;
> -
> - return 0;
> -}
> -
> /**
> * amdgpu_vce_get_create_msg - generate a VCE create msg
> *
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vce.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vce.h
> index 1c3464ce5037..778c714c8385 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vce.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vce.h
> @@ -52,6 +52,7 @@ struct amdgpu_vce {
> uint32_t srbm_soft_reset;
> unsigned num_rings;
> uint32_t keyselect;
> + struct drm_mm_node gart_node;
> };
>
> int amdgpu_vce_early_init(struct amdgpu_device *adev);
> @@ -61,7 +62,6 @@ int amdgpu_vce_entity_init(struct amdgpu_device *adev, struct amdgpu_ring *ring)
> int amdgpu_vce_suspend(struct amdgpu_device *adev);
> int amdgpu_vce_resume(struct amdgpu_device *adev);
> void amdgpu_vce_free_handles(struct amdgpu_device *adev, struct drm_file *filp);
> -u32 amdgpu_vce_required_gart_pages(struct amdgpu_device *adev);
> int amdgpu_vce_ring_parse_cs(struct amdgpu_cs_parser *p, struct amdgpu_job *job,
> struct amdgpu_ib *ib);
> int amdgpu_vce_ring_parse_cs_vm(struct amdgpu_cs_parser *p,
> diff --git a/drivers/gpu/drm/amd/amdgpu/vce_v1_0.c b/drivers/gpu/drm/amd/amdgpu/vce_v1_0.c
> index 9ae424618556..5b7b46d242c6 100644
> --- a/drivers/gpu/drm/amd/amdgpu/vce_v1_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/vce_v1_0.c
> @@ -47,11 +47,6 @@
> #define VCE_V1_0_DATA_SIZE (7808 * (AMDGPU_MAX_VCE_HANDLES + 1))
> #define VCE_STATUS_VCPU_REPORT_FW_LOADED_MASK 0x02
>
> -#define VCE_V1_0_GART_PAGE_START \
> - (AMDGPU_GTT_MAX_TRANSFER_SIZE * AMDGPU_GTT_NUM_TRANSFER_WINDOWS)
> -#define VCE_V1_0_GART_ADDR_START \
> - (VCE_V1_0_GART_PAGE_START * AMDGPU_GPU_PAGE_SIZE)
> -
> static void vce_v1_0_set_ring_funcs(struct amdgpu_device *adev);
> static void vce_v1_0_set_irq_funcs(struct amdgpu_device *adev);
>
> @@ -535,27 +530,29 @@ static int vce_v1_0_early_init(struct amdgpu_ip_block *ip_block)
> */
> static int vce_v1_0_ensure_vcpu_bo_32bit_addr(struct amdgpu_device *adev)
> {
> - u64 gpu_addr = amdgpu_bo_gpu_offset(adev->vce.vcpu_bo);
> u64 bo_size = amdgpu_bo_size(adev->vce.vcpu_bo);
> u64 max_vcpu_bo_addr = 0xffffffff - bo_size;
> u64 num_pages = ALIGN(bo_size, AMDGPU_GPU_PAGE_SIZE) / AMDGPU_GPU_PAGE_SIZE;
> u64 pa = amdgpu_gmc_vram_pa(adev, adev->vce.vcpu_bo);
> u64 flags = AMDGPU_PTE_READABLE | AMDGPU_PTE_WRITEABLE | AMDGPU_PTE_VALID;
> + u64 vce_gart_start_offs;
> + int r;
>
> - /*
> - * Check if the VCPU BO already has a 32-bit address.
> - * Eg. if MC is configured to put VRAM in the low address range.
> - */
> - if (gpu_addr <= max_vcpu_bo_addr)
> - return 0;
> + r = amdgpu_gtt_mgr_alloc_entries(&adev->mman.gtt_mgr,
> + &adev->vce.gart_node, num_pages,
> + DRM_MM_INSERT_LOW);
> + if (r)
> + return r;
> +
> + vce_gart_start_offs = amdgpu_gtt_node_to_byte_offset(&adev->vce.gart_node);
>
> /* Check if we can map the VCPU BO in GART to a 32-bit address. */
> - if (adev->gmc.gart_start + VCE_V1_0_GART_ADDR_START > max_vcpu_bo_addr)
> + if (adev->gmc.gart_start + vce_gart_start_offs > max_vcpu_bo_addr)
> return -EINVAL;
>
> - amdgpu_gart_map_vram_range(adev, pa, VCE_V1_0_GART_PAGE_START,
> + amdgpu_gart_map_vram_range(adev, pa, adev->vce.gart_node.start,
> num_pages, flags, adev->gart.ptr);
> - adev->vce.gpu_addr = adev->gmc.gart_start + VCE_V1_0_GART_ADDR_START;
> + adev->vce.gpu_addr = adev->gmc.gart_start + vce_gart_start_offs;
> if (adev->vce.gpu_addr > max_vcpu_bo_addr)
> return -EINVAL;
>
> @@ -610,7 +607,11 @@ static int vce_v1_0_sw_fini(struct amdgpu_ip_block *ip_block)
> if (r)
> return r;
>
> - return amdgpu_vce_sw_fini(adev);
> + r = amdgpu_vce_sw_fini(adev);
> +
> + amdgpu_gtt_mgr_free_entries(&adev->mman.gtt_mgr, &adev->vce.gart_node);
> +
> + return r;
> }
>
> /**
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