From 84f2356b13fdad636c33d1d2908ff2e977a09bf0 Mon Sep 17 00:00:00 2001 From: Alex Waterman Date: Wed, 16 Aug 2017 15:12:53 -0700 Subject: gpu: nvgpu: Remove sg_phys() from GMMU code Remove the last sg_phys() call from the GMMU code and replace it with a generic nvgpu_mem API. This new API, nvgpu_mem_get_phys_addr(), returns the physical address of an nvgpu_mem struct. Also, implement this new API in the Linux specific nvgpu_mem code since it requires access to the underlying SGT/SGL. JIRA NVGPU-68 Change-Id: Idf88701a2a8515464c658c26e0de493c82ff850d Signed-off-by: Alex Waterman Reviewed-on: https://git-master.nvidia.com/r/1542964 Reviewed-by: Automatic_Commit_Validation_User Reviewed-by: mobile promotions Tested-by: mobile promotions --- drivers/gpu/nvgpu/common/linux/nvgpu_mem.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'drivers/gpu/nvgpu/common/linux/nvgpu_mem.c') diff --git a/drivers/gpu/nvgpu/common/linux/nvgpu_mem.c b/drivers/gpu/nvgpu/common/linux/nvgpu_mem.c index 8d8909dd..8cf3011e 100644 --- a/drivers/gpu/nvgpu/common/linux/nvgpu_mem.c +++ b/drivers/gpu/nvgpu/common/linux/nvgpu_mem.c @@ -284,6 +284,14 @@ static u64 nvgpu_mem_get_addr_sysmem(struct gk20a *g, struct nvgpu_mem *mem) * Return the base address of %mem. Handles whether this is a VIDMEM or SYSMEM * allocation. * + * Note: this API does not make sense to use for _VIDMEM_ buffers with greater + * than one scatterlist chunk. If there's more than one scatterlist chunk then + * the buffer will not be contiguous. As such the base address probably isn't + * very useful. This is true for SYSMEM as well, if there's no IOMMU. + * + * However! It _is_ OK to use this on discontiguous sysmem buffers _if_ there's + * an IOMMU present and enabled for the GPU. + * * %attrs can be NULL. If it is not NULL then it may be inspected to determine * if the address needs to be modified before writing into a PTE. */ @@ -305,6 +313,23 @@ u64 nvgpu_mem_get_addr(struct gk20a *g, struct nvgpu_mem *mem) return alloc->base; } +/* + * This should only be used on contiguous buffers regardless of whether + * there's an IOMMU present/enabled. This applies to both SYSMEM and + * VIDMEM. + */ +u64 nvgpu_mem_get_phys_addr(struct gk20a *g, struct nvgpu_mem *mem) +{ + /* + * For a VIDMEM buf, this is identical to simply get_addr() so just fall + * back to that. + */ + if (mem->aperture == APERTURE_VIDMEM) + return nvgpu_mem_get_addr(g, mem); + + return sg_phys(mem->priv.sgt->sgl); +} + /* * Be careful how you use this! You are responsible for correctly freeing this * memory. -- cgit v1.2.2