On 11/3/25 23:23, Timur Kristóf wrote: > Binds pages that located in VRAM to the GART page table. > > Useful when a kernel BO is located in VRAM but > needs to be accessed from the GART address space, > for example to give a kernel BO a 32-bit address > when GART is placed in LOW address space. > > v2: > - Refactor function to be more reusable > > Signed-off-by: Timur Kristóf <[email protected]>
Reviewed-by: Christian König <[email protected]> > --- > drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c | 36 ++++++++++++++++++++++++ > drivers/gpu/drm/amd/amdgpu/amdgpu_gart.h | 3 ++ > 2 files changed, 39 insertions(+) > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c > b/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c > index 83f3b94ed975..d2237ce9da70 100644 > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c > @@ -367,6 +367,42 @@ void amdgpu_gart_map(struct amdgpu_device *adev, > uint64_t offset, > drm_dev_exit(idx); > } > > +/** > + * amdgpu_gart_map_vram_range - map VRAM pages into the GART page table > + * > + * @adev: amdgpu_device pointer > + * @pa: physical address of the first page to be mapped > + * @start_page: first page to map in the GART aperture > + * @num_pages: number of pages to be mapped > + * @flags: page table entry flags > + * @dst: CPU address of the GART table > + * > + * Binds a BO that is allocated in VRAM to the GART page table > + * (all ASICs). > + * > + * Useful when a kernel BO is located in VRAM but > + * needs to be accessed from the GART address space. > + */ > +void amdgpu_gart_map_vram_range(struct amdgpu_device *adev, uint64_t pa, > + uint64_t start_page, uint64_t num_pages, > + uint64_t flags, void *dst) > +{ > + u32 i, idx; > + > + /* The SYSTEM flag indicates the pages aren't in VRAM. */ > + WARN_ON_ONCE(flags & AMDGPU_PTE_SYSTEM); > + > + if (!drm_dev_enter(adev_to_drm(adev), &idx)) > + return; > + > + for (i = 0; i < num_pages; ++i) { > + amdgpu_gmc_set_pte_pde(adev, adev->gart.ptr, > + start_page + i, pa + AMDGPU_GPU_PAGE_SIZE * i, flags); > + } > + > + drm_dev_exit(idx); > +} > + > /** > * amdgpu_gart_bind - bind pages into the gart page table > * > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.h > b/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.h > index 7cc980bf4725..d3118275ddae 100644 > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.h > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.h > @@ -64,5 +64,8 @@ void amdgpu_gart_map(struct amdgpu_device *adev, uint64_t > offset, > void *dst); > void amdgpu_gart_bind(struct amdgpu_device *adev, uint64_t offset, > int pages, dma_addr_t *dma_addr, uint64_t flags); > +void amdgpu_gart_map_vram_range(struct amdgpu_device *adev, uint64_t pa, > + uint64_t start_page, uint64_t num_pages, > + uint64_t flags, void *dst); > void amdgpu_gart_invalidate_tlb(struct amdgpu_device *adev); > #endif
