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gpu: nvgpu: Make buf alignment generic

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Drastically simplify and move the aligment computation for buffers
getting mapped into the SGT code. An SGT is all that is needed for
computing the alignment.

However, this did require that a new SGT op was added:

  nvgpu_sgt_iommuable()

This function returns true if the passed SGT is IOMMU'able and must
be implemented by an SGT implementation that has IOMMU'able buffers.
If this function is left as NULL then it is assumed that the buffer
is not IOMMU'able.

Also cleanup the parameter ordering convention among all nvgpu_sgt
functions. Previously there was a mishmash of different parameter
orderings. This patch now standardizes on the gk20a first approach
seen everywhere else in the driver.

JIRA NVGPU-30
JIRA NVGPU-246
JIRA NVGPU-71

Change-Id: Ic4ab7b752847cf795c7cfafed5a07818217bba86
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1583985
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Alex Waterman
2017-10-18 13:24:53 -07:00
committed by mobile promotions
parent 6911b4d48c
commit ee4970a33f
6 changed files with 86 additions and 74 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/gpu/nvgpu/common/linux/nvgpu_mem.c
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@@ -529,6 +529,12 @@ static u64 nvgpu_mem_linux_sgl_gpu_addr(struct gk20a *g, void *sgl,
sg_dma_address((struct scatterlist *)sgl));
}
static bool nvgpu_mem_linux_sgt_iommuable(struct gk20a *g,
struct nvgpu_sgt *sgt)
{
return true;
}
static void nvgpu_mem_linux_sgl_free(struct gk20a *g, struct nvgpu_sgt *sgt)
{
/*
@@ -539,12 +545,13 @@ static void nvgpu_mem_linux_sgl_free(struct gk20a *g, struct nvgpu_sgt *sgt)
}
static const struct nvgpu_sgt_ops nvgpu_linux_sgt_ops = {
.sgl_next = nvgpu_mem_linux_sgl_next,
.sgl_phys = nvgpu_mem_linux_sgl_phys,
.sgl_dma = nvgpu_mem_linux_sgl_dma,
.sgl_length = nvgpu_mem_linux_sgl_length,
.sgl_gpu_addr = nvgpu_mem_linux_sgl_gpu_addr,
.sgt_free = nvgpu_mem_linux_sgl_free,
.sgl_next = nvgpu_mem_linux_sgl_next,
.sgl_phys = nvgpu_mem_linux_sgl_phys,
.sgl_dma = nvgpu_mem_linux_sgl_dma,
.sgl_length = nvgpu_mem_linux_sgl_length,
.sgl_gpu_addr = nvgpu_mem_linux_sgl_gpu_addr,
.sgt_iommuable = nvgpu_mem_linux_sgt_iommuable,
.sgt_free = nvgpu_mem_linux_sgl_free,
};
static struct nvgpu_sgt *__nvgpu_mem_get_sgl_from_vidmem(