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gpu: nvgpu: add check for unaligned access

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Add a build time check to confirm that unaligned accesses
are enabled for NvGPU driver. If unaligned access is not
enabled it results in a build error.

Currently it only checks for ARM build of NvGPU driver.

JIRA NVGPU-3908
JIRA NVGPU-3561

Change-Id: Ifd190a8f489844ed36b5c5cb51b48257ef051f9f
Signed-off-by: Nitin Kumbhar <nkumbhar@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2197150
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Nitin Kumbhar
2019-09-13 11:26:53 +05:30
committed by Alex Waterman
parent 07ab78c464
commit 2eb3c431bd
1 changed files with 25 additions and 0 deletions
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25
drivers/gpu/nvgpu/include/nvgpu/static_analysis.h
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@@ -442,6 +442,31 @@ static inline s32 nvgpu_safe_cast_s64_to_s32(s64 sl_a)
}
}
/*
* Skip unaligned access check in NvGPU when it's built for unit testing with
* __NVGPU_UNIT_TEST__. As NvGPU UT build is not used on any production system,
* there is no need to consider security aspects related NvGPU UT build.
*/
#if !defined(__NVGPU_UNIT_TEST__)
/*
* NvGPU driver is built for ARM targets with unaligned-access enabled. Confirm
* enabling of unaligned-access with a check for __ARM_FEATURE_UNALIGNED.
*
* This confirmation helps argue NvGPU security in context of CERT-C EXP36-C and
* INT36-C violations which flag misalignment.
*
* If and when NvGPU is built using a different compiler/architecture (non-ARM),
* a similar check for that architecture is required. If an unaligned access is
* not possible, then the CERT-C violations due to unaligned access need to be
* fixed.
*/
#if !defined(__ARM_FEATURE_UNALIGNED)
#error "__ARM_FEATURE_UNALIGNED not defined. Check static_analysis.h"
#endif
#endif
#define NVGPU_PRECISION(v) _Generic(v, \
unsigned int : __builtin_popcount, \
unsigned long : __builtin_popcountl, \