[PATCH libdrm] amdgpu: Provide more specific error message if non-privileged user runs amdgpu_test

[Alex Xie]

Before this change, the error message is:
"WARNING - Suite initialization failed..."
People might think this is a driver problem.

Tested with non-privileged user. Now the error message is like:
...
Error:Permission denied. Hint:Try to run this test program as root.
WARNING - Suite initialization failed for 'Basic Tests'.
...

Tested as root with no regression.

amdgpu_test uses CUnit. CUnit outputs warning message to stdout.
To be consistent, this commit outputs error message to stdout.

v2: Use strerror instead of %m. %m is a GNU C Library extension.
v3: Limit code and commit message within 80 characters per line.
    Update commit message.
    Remove a space before starting parenthesis in function call.

Change-Id: Ib891c40ec812053f49ce5a99909455ac3137e32c
Signed-off-by: Alex Xie <AlexBin.Xie at amd.com>
---
 tests/amdgpu/basic_tests.c | 7 ++++++-
 tests/amdgpu/bo_tests.c    | 8 +++++++-
 tests/amdgpu/cs_tests.c    | 8 +++++++-
 tests/amdgpu/vce_tests.c   | 8 +++++++-
 4 files changed, 27 insertions(+), 4 deletions(-)

diff --git a/tests/amdgpu/basic_tests.c b/tests/amdgpu/basic_tests.c
index 11f6a63..bfda21b 100644
--- a/tests/amdgpu/basic_tests.c
+++ b/tests/amdgpu/basic_tests.c
@@ -206,8 +206,13 @@ int suite_basic_tests_init(void)
 
 	if (r == 0)
 		return CUE_SUCCESS;
-	else
+	else {
+		if ((r == -EACCES) && (errno == EACCES))
+			printf("\n\nError:%s. "
+				"Hint:Try to run this test program as root.",
+				strerror(errno));
 		return CUE_SINIT_FAILED;
+	}
 }
 
 int suite_basic_tests_clean(void)
diff --git a/tests/amdgpu/bo_tests.c b/tests/amdgpu/bo_tests.c
index 993895d..25df767 100644
--- a/tests/amdgpu/bo_tests.c
+++ b/tests/amdgpu/bo_tests.c
@@ -65,8 +65,14 @@ int suite_bo_tests_init(void)
 
 	r = amdgpu_device_initialize(drm_amdgpu[0], &major_version,
 				  &minor_version, &device_handle);
-	if (r)
+	if (r) {
+		if ((r == -EACCES) && (errno == EACCES))
+			printf("\n\nError:%s. "
+				"Hint:Try to run this test program as root.",
+				strerror(errno));
+
 		return CUE_SINIT_FAILED;
+	}
 
 	req.alloc_size = BUFFER_SIZE;
 	req.phys_alignment = BUFFER_ALIGN;
diff --git a/tests/amdgpu/cs_tests.c b/tests/amdgpu/cs_tests.c
index a01ee48..82c55aa 100644
--- a/tests/amdgpu/cs_tests.c
+++ b/tests/amdgpu/cs_tests.c
@@ -76,8 +76,14 @@ int suite_cs_tests_init(void)
 
 	r = amdgpu_device_initialize(drm_amdgpu[0], &major_version,
 				     &minor_version, &device_handle);
-	if (r)
+	if (r) {
+		if ((r == -EACCES) && (errno == EACCES))
+			printf("\n\nError:%s. "
+				"Hint:Try to run this test program as root.",
+				strerror(errno));
+
 		return CUE_SINIT_FAILED;
+	}
 
 	family_id = device_handle->info.family_id;
 	/* VI asic POLARIS10/11 have specific external_rev_id */
diff --git a/tests/amdgpu/vce_tests.c b/tests/amdgpu/vce_tests.c
index 4915170..de63aa1 100644
--- a/tests/amdgpu/vce_tests.c
+++ b/tests/amdgpu/vce_tests.c
@@ -94,8 +94,14 @@ int suite_vce_tests_init(void)
 
 	r = amdgpu_device_initialize(drm_amdgpu[0], &major_version,
 				     &minor_version, &device_handle);
-	if (r)
+	if (r) {
+		if ((r == -EACCES) && (errno == EACCES))
+			printf("\n\nError:%s. "
+				"Hint:Try to run this test program as root.",
+				strerror(errno));
+
 		return CUE_SINIT_FAILED;
+	}
 
 	family_id = device_handle->info.family_id;
 	vce_harvest_config = device_handle->info.vce_harvest_config;
-- 
2.7.4