[PATCH i-g-t v5 4/9] tests/intel/xe_madvise: Add purged-mmap-blocked subtest

[Arvind Yadav <arvind.yadav@intel.com>]

Add a new purged-mmap-blocked subtest that triggers an actual purge
via memory pressure and verifies that DRM_IOCTL_XE_GEM_MMAP_OFFSET
returns -EINVAL once the BO backing store has been permanently
discarded.

  - DONTNEED BOs: return -EBUSY (temporary purgeable state, BO still
    has backing store but can be purged at any time)
  - Purged BOs: return -EINVAL (permanent, backing store discarded)

v5:
  - Add purged-mmap-blocked subtest to verify
    DRM_IOCTL_XE_GEM_MMAP_OFFSET returns -EINVAL after BO
    backing store is permanently purged.

Cc: Nishit Sharma <nishit.sharma@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Cc: Pravalika Gurram <pravalika.gurram@intel.com>
Signed-off-by: Arvind Yadav <arvind.yadav@intel.com>
---
 tests/intel/xe_madvise.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/tests/intel/xe_madvise.c b/tests/intel/xe_madvise.c
index 435dd939e..8dc568a92 100644
--- a/tests/intel/xe_madvise.c
+++ b/tests/intel/xe_madvise.c
@@ -152,6 +152,34 @@ static void purgeable_setup_simple_bo(int fd, uint32_t *vm, uint32_t *bo,
 	xe_wait_ufence(fd, &sync_val, 1, 0, NSEC_PER_SEC);
 }
 
+/**
+ * SUBTEST: purged-mmap-blocked
+ * Description: After BO is purged, verify mmap offset fails with -EINVAL
+ * Test category: functionality test
+ */
+static void test_purged_mmap_blocked(int fd, struct drm_xe_engine_class_instance *hwe)
+{
+	uint32_t bo, vm;
+	uint64_t addr = PURGEABLE_ADDR;
+	size_t bo_size = PURGEABLE_BO_SIZE;
+	struct drm_xe_gem_mmap_offset mmo = {};
+
+	purgeable_setup_simple_bo(fd, &vm, &bo, addr, bo_size, false);
+	if (!purgeable_mark_and_verify_purged(fd, vm, addr, bo_size)) {
+		gem_close(fd, bo);
+		xe_vm_destroy(fd, vm);
+		igt_skip("Unable to induce purge on this platform/config");
+	}
+
+	/* Attempt to get mmap offset for purged BO - should fail with EINVAL */
+	mmo.handle = bo;
+	igt_assert_eq(igt_ioctl(fd, DRM_IOCTL_XE_GEM_MMAP_OFFSET, &mmo), -1);
+	igt_assert_eq(errno, EINVAL);
+
+	gem_close(fd, bo);
+	xe_vm_destroy(fd, vm);
+}
+
 /**
  * SUBTEST: dontneed-before-mmap
  * Description: Mark BO as DONTNEED before mmap, verify mmap offset fails with -EBUSY
@@ -203,6 +231,12 @@ int igt_main()
 			break;
 		}
 
+	igt_subtest("purged-mmap-blocked")
+		xe_for_each_engine(fd, hwe) {
+			test_purged_mmap_blocked(fd, hwe);
+			break;
+		}
+
 	igt_fixture() {
 		xe_device_put(fd);
 		drm_close_driver(fd);
-- 
2.43.0