[PATCH i-g-t v3 04/10] tests/intel/xe_svm: add random access test for SVM

[Bommu Krishnaiah]

Verifies the Shared Virtual Memory (SVM) functionality by randomly
accessing any location in malloc'ed memory. The test ensures that
the GPU can correctly handle random memory access patterns.

Signed-off-by: Bommu Krishnaiah <krishnaiah.bommu at intel.com>
Cc: Oak Zeng <oak.zeng at intel.com>
Cc: Himal Prasad Ghimiray <himal.prasad.ghimiray at intel.com>
---
 tests/intel/xe_svm.c | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/tests/intel/xe_svm.c b/tests/intel/xe_svm.c
index 741961529..73a232c47 100644
--- a/tests/intel/xe_svm.c
+++ b/tests/intel/xe_svm.c
@@ -27,6 +27,9 @@
  *
  * SUBTEST: svm-basic-mmap
  * Description: Verify SVM basic functionality using mmap.
+ *
+ * SUBTEST: svm-random-access
+ * Description: Verifies that the GPU can randomly access and correctly store values in malloc'ed memory.
  */
 
 #include <fcntl.h>
@@ -119,6 +122,40 @@ static void svm_basic(int fd, uint32_t vm, struct drm_xe_engine_class_instance *
 		free(dst);
 }
 
+/**
+ *  @brief Verifies GPU can randomly access any location in malloc'ed memory.
+ *
+ *This function tests the ability of the GPU to randomly access and correctly store
+ * values in malloc'ed memory.
+ */
+static void svm_random_access(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, *dst_to_access;
+	uint32_t size = 1024*1024, sz_dw = size/4;
+
+	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 = malloc(size);
+	dst_to_access = dst + random()%sz_dw;
+
+	xe_create_cmdbuf(&cmd_buf, insert_store, (uint64_t)dst_to_access, 0xc0ffee, eci);
+	xe_submit_cmd(&cmd_buf);
+
+	igt_assert_eq(*dst, 0xc0ffee);
+
+	xe_destroy_cmdbuf(&cmd_buf);
+	free(dst);
+}
+
 igt_main
 {
 	int fd;
@@ -143,6 +180,10 @@ igt_main
 		xe_for_each_engine(fd, hwe)
 			svm_basic(fd, vm, hwe, true);
 
+	igt_subtest_f("svm-random-access")
+		xe_for_each_engine(fd, hwe)
+			svm_random_access(fd, vm, hwe);
+
 	igt_fixture {
 		xe_vm_destroy(fd, vm);
 		drm_close_driver(fd);
-- 
2.25.1