[PATCH v2] drm/amdgpu: Fix the EPERM error when get user pages

[Ma Jun <Jun.Ma2@amd.com>]

Check and pass the readonly flags when set amdgpu_ttm_tt flags

for readonly ptr pages. Otherwise, there is EPERM error returned

during the KFDExceptionTest.PermissionFaultUserPointer test on

ploaris10.

Signed-off-by: Ma Jun <Jun.Ma2@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
index d426333e865a..85d1087439c0 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -1036,10 +1036,17 @@ static int init_user_pages(struct kgd_mem *mem, uint64_t user_addr,
 	struct ttm_operation_ctx ctx = { true, false };
 	struct hmm_range *range;
 	int ret = 0;
+	uint32_t tt_flags = 0;
 
 	mutex_lock(&process_info->lock);
 
-	ret = amdgpu_ttm_tt_set_userptr(&bo->tbo, user_addr, 0);
+	if (!(mem->alloc_flags & KFD_IOC_ALLOC_MEM_FLAGS_WRITABLE))
+		tt_flags |= AMDGPU_GEM_USERPTR_READONLY;
+	else
+		tt_flags = 0;
+
+
+	ret = amdgpu_ttm_tt_set_userptr(&bo->tbo, user_addr, tt_flags);
 	if (ret) {
 		pr_err("%s: Failed to set userptr: %d\n", __func__, ret);
 		goto out;
-- 
2.34.1