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gpu: nvgpu: mm: whitelist MISRA 17.2 violations

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Whitelist 2 MISRA Rule 17.2 violations in MM that were approved as
deviations in TID-278. These two violations are for recursive functions
that handle page table descriptors in the GMMU page table. Both cases
are tightly controlled recursion by limiting the recursion depth to the
number of possible page table levels in the hardware. For current
hardware that is a maximum recursion depth of 5 which is easily an
acceptable depth and should cause no stack issues.

JIRA NVGPU-3489
JIRA NVGPU-3492
JIRA TID-278

Change-Id: I5b801ff77f66bb8698f1d6adcd41ebbad3f86f92
Signed-off-by: Philip Elcan <pelcan@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2230077
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svc-mobile-misra <svc-mobile-misra@nvidia.com>
Reviewed-by: svc-mobile-cert <svc-mobile-cert@nvidia.com>
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Philip Elcan
2019-11-01 10:13:21 -04:00
committed by Alex Waterman
parent 72fc76c8ac
commit 6d0ef6473d
2 changed files with 4 additions and 0 deletions
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2
drivers/gpu/nvgpu/common/mm/vm.c
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@@ -181,6 +181,7 @@ u32 nvgpu_vm_pde_coverage_bit_count(struct vm_gk20a *vm)
return vm->mmu_levels[final_pde_level].lo_bit[0];
}
NVGPU_COV_WHITELIST_BLOCK_BEGIN(deviate, 1, NVGPU_MISRA(Rule, 17_2), "TID-278")
static void nvgpu_vm_do_free_entries(struct vm_gk20a *vm,
struct nvgpu_gmmu_pd *pd,
u32 level)
@@ -206,6 +207,7 @@ static void nvgpu_vm_do_free_entries(struct vm_gk20a *vm,
pd->entries = NULL;
}
}
NVGPU_COV_WHITELIST_BLOCK_END(NVGPU_MISRA(Rule, 17_2))
static void nvgpu_vm_free_entries(struct vm_gk20a *vm,
struct nvgpu_gmmu_pd *pdb)