[PATCH AUTOSEL 6.0 28/34] drm/amdkfd: Fix type of reset_type parameter in hqd_destroy() callback

Sasha Levin
2022-11-01T11:30:46Z

From: Nathan Chancellor <nathan@kernel.org>

[ Upstream commit e688ba3e276422aa88eae7a54186a95320836081 ]

When booting a kernel compiled with CONFIG_CFI_CLANG on a machine with
an RX 6700 XT, there is a CFI failure in kfd_destroy_mqd_cp():

[ 12.894543] CFI failure at kfd_destroy_mqd_cp+0x2a/0x40 [amdgpu] (target: hqd_destroy_v10_3+0x0/0x260 [amdgpu]; expected type: 0x8594d794)

Clang's kernel Control Flow Integrity (kCFI) makes sure that all
indirect call targets have a type that exactly matches the function
pointer prototype. In this case, hqd_destroy()'s third parameter,
reset_type, should have a type of 'uint32_t' but every implementation of
this callback has a third parameter type of 'enum kfd_preempt_type'.

Update the function pointer prototype to match reality so that there is
no more CFI violation.

Link: https://github.com/ClangBuiltLinux/linux/issues/1738
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/amd/include/kgd_kfd_interface.h | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/include/kgd_kfd_interface.h b/drivers/gpu/drm/amd/include/kgd_kfd_interface.h
index e85364dff4e0..5cb3e8634739 100644
--- a/drivers/gpu/drm/amd/include/kgd_kfd_interface.h
+++ b/drivers/gpu/drm/amd/include/kgd_kfd_interface.h
@@ -262,8 +262,9 @@ struct kfd2kgd_calls {
uint32_t queue_id);

int (*hqd_destroy)(struct amdgpu_device *adev, void *mqd,
- uint32_t reset_type, unsigned int timeout,
- uint32_t pipe_id, uint32_t queue_id);
+ enum kfd_preempt_type reset_type,
+ unsigned int timeout, uint32_t pipe_id,
+ uint32_t queue_id);

bool (*hqd_sdma_is_occupied)(struct amdgpu_device *adev, void *mqd);

--
2.35.1