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gpu: nvgpu: Remove the use of READ_ONLY for DMA API

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READ_ONLY flag for dma API is a Tegra specific API. We use it only
to prevent accidental writes to non-secure ACR bootloader. Its use is
marginal, so remove the flag.

JIRA NVGPU-4

Change-Id: I887dc04aee8f7ace40220294851b210375dfde98
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1648174
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Terje Bergstrom
2018-01-29 12:48:52 -08:00
committed by mobile promotions
parent ec00a6c2db
commit b86a5d1632
2 changed files with 2 additions and 6 deletions
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5
drivers/gpu/nvgpu/common/linux/dma.c
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@@ -50,7 +50,7 @@
* added it must be added here as well!!
*/
#define NVGPU_DMA_STR_SIZE \
sizeof("NO_KERNEL_MAPPING FORCE_CONTIGUOUS READ_ONLY")
sizeof("NO_KERNEL_MAPPING FORCE_CONTIGUOUS")
/*
* The returned string is kmalloc()ed here but must be freed by the caller.
@@ -77,7 +77,6 @@ static char *nvgpu_dma_flags_to_str(struct gk20a *g, unsigned long flags)
APPEND_FLAG(NVGPU_DMA_NO_KERNEL_MAPPING, "NO_KERNEL_MAPPING ");
APPEND_FLAG(NVGPU_DMA_FORCE_CONTIGUOUS, "FORCE_CONTIGUOUS ");
APPEND_FLAG(NVGPU_DMA_READ_ONLY, "READ_ONLY");
#undef APPEND_FLAG
return buf;
@@ -171,8 +170,6 @@ static void nvgpu_dma_flags_to_attrs(struct dma_attrs *attrs,
dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, ATTR_ARG(attrs));
if (flags & NVGPU_DMA_FORCE_CONTIGUOUS)
dma_set_attr(DMA_ATTR_FORCE_CONTIGUOUS, ATTR_ARG(attrs));
if (flags & NVGPU_DMA_READ_ONLY)
dma_set_attr(DMA_ATTR_READ_ONLY, ATTR_ARG(attrs));
#undef ATTR_ARG
}