[PATCH i-g-t v2 09/10] tests/intel/xe_svm: svm_mprotect

[Bommu Krishnaiah <krishnaiah.bommu@intel.com>]

Verify SVM functionality while accessing read only memory

Signed-off-by: Bommu Krishnaiah <krishnaiah.bommu@intel.com>
Cc: Oak Zeng <oak.zeng@intel.com>
Cc: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
---
 tests/intel/xe_svm.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/tests/intel/xe_svm.c b/tests/intel/xe_svm.c
index 0b573e0c9..e8989afaa 100644
--- a/tests/intel/xe_svm.c
+++ b/tests/intel/xe_svm.c
@@ -34,6 +34,8 @@
  * Description: verify SVM basic functionality by using GPU atomic access any location in malloc'ed memory
  * SUBTEST: svm_invalid_va
  * Description: verify SVM functionality while accessing invalid address
+ * SUBTEST: svm-mprotect
+ * Description: verify SVM functionality while accessing read only memory
  * SUBTEST: svm-benchmark
  * Description: verify SVM performance with simple benchmark test
  */
@@ -256,6 +258,38 @@ static void svm_invalid_va(int fd, uint32_t vm, struct drm_xe_engine_class_insta
 	free(dst);
 }
 
+/**
+ * Use mprotect to mark a chunk of memory to be read only and submit
+ * GPU command to write to this read only memory. GPU write should
+ * fail and driver should detect an invalid access error.
+ */
+static void svm_mprotect(int fd, uint32_t vm, struct drm_xe_engine_class_instance *eci)
+{
+	uint64_t gpu_va = 0x1a0000;
+	size_t bo_size = xe_bb_size(fd, PAGE_ALIGN_UFENCE);
+	uint32_t *dst;
+	uint32_t size = 65536;
+
+	struct xe_buffer cmd_buf = {
+		.fd = fd,
+		.gpu_addr = (void *)(uintptr_t)gpu_va,
+		.vm = vm,
+		.size = bo_size,
+		.placement = vram_if_possible(fd, eci->gt_id),
+		.flag = DRM_XE_GEM_CREATE_FLAG_NEEDS_VISIBLE_VRAM,
+	};
+
+	dst = aligned_alloc(size, size);
+	mprotect(dst, size, PROT_READ);
+
+	xe_create_cmdbuf(&cmd_buf, insert_store, (uint64_t)dst, 0xc0ffee, eci);
+
+	igt_assert_eq(__xe_submit_cmd(&cmd_buf), -EIO);
+
+	xe_destroy_cmdbuf(&cmd_buf);
+	free(dst);
+}
+
 /**
  * A simple benchmark test.
  * Use GPU to memset a buffer with specific value and
@@ -338,6 +372,10 @@ igt_main
 		xe_for_each_engine(fd, hwe)
 			svm_invalid_va(fd, vm, hwe);
 
+	igt_subtest_f("svm-mprotect")
+		xe_for_each_engine(fd, hwe)
+			svm_mprotect(fd, vm, hwe);
+
 	igt_subtest_f("svm-benchmark")
 		xe_for_each_engine(fd, hwe)
 			svm_benchmark(fd, vm, hwe);
-- 
2.25.1