[PATCH v2 1/4] tests/intel/xe_pat: add userptr-comp subtest

[Xin Wang <x.wang@intel.com>]

Add a new xe_pat subtest that iterates the debugfs PAT table and
validates that userptr bindings are rejected for PAT entries
enabling compression and for COH_MODE_NONE entries.

Expected failures return -EINVAL.

Cc: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Xin Wang <x.wang@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
---
 tests/intel/xe_pat.c | 61 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)

diff --git a/tests/intel/xe_pat.c b/tests/intel/xe_pat.c
index a7f8ab088..5ad4922dd 100644
--- a/tests/intel/xe_pat.c
+++ b/tests/intel/xe_pat.c
@@ -887,6 +887,64 @@ static void bo_comp_disable_bind(int fd)
 	xe_vm_destroy(fd, vm);
 }
 
+/**
+ * SUBTEST: userptr-comp
+ * Test category: functionality test
+ * Description: Validate that userptr mappings cannot be bound with a PAT index
+ * that enables compression (expected to fail with -EINVAL).
+ */
+static void userptr_comp(int fd)
+{
+	size_t size = xe_get_default_alignment(fd);
+	uint16_t dev_id = intel_get_drm_devid(fd);
+	struct intel_pat_cache pat_sw_config = {};
+	int32_t parsed;
+	uint32_t vm;
+	void *data;
+
+	igt_require(intel_get_device_info(dev_id)->graphics_ver >= 20);
+
+	parsed = xe_fetch_pat_sw_config(fd, &pat_sw_config);
+
+	data = mmap(0, size, PROT_READ | PROT_WRITE,
+		    MAP_SHARED | MAP_ANONYMOUS, -1, 0);
+	igt_assert(data != MAP_FAILED);
+
+	vm = xe_vm_create(fd, 0, 0);
+
+	for (int i = 0; i < parsed; i++) {
+		uint32_t pat;
+		uint32_t coh_mode;
+		bool compressed;
+		uint64_t va;
+		int expected;
+		int ret;
+
+		if (pat_sw_config.entries[i].rsvd)
+			continue;
+		pat = pat_sw_config.entries[i].pat;
+		compressed = !!(pat & XE2_COMP_EN);
+		coh_mode = REG_FIELD_GET(XE2_COH_MODE, pat);
+
+		/* Spread VAs to keep each attempt independent. */
+		va = 0x40000ull + (uint64_t)i * 0x200000ull;
+
+		if (compressed || coh_mode == COH_MODE_NONE)
+			expected = -EINVAL;
+		else
+			expected = 0;
+		ret = __xe_vm_bind(fd, vm, 0, 0, to_user_pointer(data), va,
+				   size, DRM_XE_VM_BIND_OP_MAP_USERPTR, 0, NULL, 0, 0,
+				   i, 0);
+		igt_assert_eq(ret, expected);
+		if (!ret)
+			xe_vm_unbind_sync(fd, vm, 0, va, size);
+	}
+
+	munmap(data, size);
+	xe_vm_destroy(fd, vm);
+}
+
 /**
  * SUBTEST: display-vs-wb-transient
  * Test category: functionality test
@@ -1317,6 +1375,9 @@ int igt_main_args("V", NULL, help_str, opt_handler, NULL)
 	igt_subtest("userptr-coh-none")
 		userptr_coh_none(fd);
 
+	igt_subtest("userptr-comp")
+		userptr_comp(fd);
+
 	igt_subtest("prime-self-import-coh")
 		prime_self_import_coh();
 
-- 
2.43.0