drm/xe: Delete PT update selftest

IGTs (e.g. xe_vm) can provide the exact same coverage as the PT update
selftest. The PT update selftest is dependent on internal functions
which can change thus maintaining this test is costly and provide no
extra coverage. Delete this test.
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Oak Zeng <oak.zeng@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240425045513.1913039-14-matthew.brost@intel.com

drivers/gpu/drm/xe/tests/xe_migrate.c

@@ -62,36 +62,6 @@ static int run_sanity_job(struct xe_migrate *m, struct xe_device *xe,
 	return 0;
 }
 
-static void
-sanity_populate_cb(struct xe_migrate_pt_update *pt_update,
-		   struct xe_tile *tile, struct iosys_map *map, void *dst,
-		   u32 qword_ofs, u32 num_qwords,
-		   const struct xe_vm_pgtable_update *update)
-{
-	struct migrate_test_params *p =
-		to_migrate_test_params(xe_cur_kunit_priv(XE_TEST_LIVE_MIGRATE));
-	int i;
-	u64 *ptr = dst;
-	u64 value;
-
-	for (i = 0; i < num_qwords; i++) {
-		value = (qword_ofs + i - update->ofs) * 0x1111111111111111ULL;
-		if (map)
-			xe_map_wr(tile_to_xe(tile), map, (qword_ofs + i) *
-				  sizeof(u64), u64, value);
-		else
-			ptr[i] = value;
-	}
-
-	kunit_info(xe_cur_kunit(), "Used %s.\n", map ? "CPU" : "GPU");
-	if (p->force_gpu && map)
-		KUNIT_FAIL(xe_cur_kunit(), "GPU pagetable update used CPU.\n");
-}
-
-static const struct xe_migrate_pt_update_ops sanity_ops = {
-	.populate = sanity_populate_cb,
-};
-
 #define check(_retval, _expected, str, _test)				\
 	do { if ((_retval) != (_expected)) {				\
 			KUNIT_FAIL(_test, "Sanity check failed: " str	\
@@ -209,57 +179,6 @@ static void test_copy_vram(struct xe_migrate *m, struct xe_bo *bo,
 	test_copy(m, bo, test, region);
 }
 
-static void test_pt_update(struct xe_migrate *m, struct xe_bo *pt,
-			   struct kunit *test, bool force_gpu)
-{
-	struct xe_device *xe = tile_to_xe(m->tile);
-	struct dma_fence *fence;
-	u64 retval, expected;
-	ktime_t then, now;
-	int i;
-
-	struct xe_vm_pgtable_update update = {
-		.ofs = 1,
-		.qwords = 0x10,
-		.pt_bo = pt,
-	};
-	struct xe_migrate_pt_update pt_update = {
-		.ops = &sanity_ops,
-	};
-	struct migrate_test_params p = {
-		.base.id = XE_TEST_LIVE_MIGRATE,
-		.force_gpu = force_gpu,
-	};
-
-	test->priv = &p;
-	/* Test xe_migrate_update_pgtables() updates the pagetable as expected */
-	expected = 0xf0f0f0f0f0f0f0f0ULL;
-	xe_map_memset(xe, &pt->vmap, 0, (u8)expected, pt->size);
-
-	then = ktime_get();
-	fence = xe_migrate_update_pgtables(m, m->q->vm, NULL, m->q, &update, 1,
-					   NULL, 0, &pt_update);
-	now = ktime_get();
-	if (sanity_fence_failed(xe, fence, "Migration pagetable update", test))
-		return;
-
-	kunit_info(test, "Updating without syncing took %llu us,\n",
-		   (unsigned long long)ktime_to_us(ktime_sub(now, then)));
-
-	dma_fence_put(fence);
-	retval = xe_map_rd(xe, &pt->vmap, 0, u64);
-	check(retval, expected, "PTE[0] must stay untouched", test);
-
-	for (i = 0; i < update.qwords; i++) {
-		retval = xe_map_rd(xe, &pt->vmap, (update.ofs + i) * 8, u64);
-		check(retval, i * 0x1111111111111111ULL, "PTE update", test);
-	}
-
-	retval = xe_map_rd(xe, &pt->vmap, 8 * (update.ofs + update.qwords),
-			   u64);
-	check(retval, expected, "PTE[0x11] must stay untouched", test);
-}
-
 static void xe_migrate_sanity_test(struct xe_migrate *m, struct kunit *test)
 {
 	struct xe_tile *tile = m->tile;
@@ -398,11 +317,6 @@ static void xe_migrate_sanity_test(struct xe_migrate *m, struct kunit *test)
 		test_copy_vram(m, big, test);
 	}
 
-	kunit_info(test, "Testing page table update using CPU if GPU idle.\n");
-	test_pt_update(m, pt, test, false);
-	kunit_info(test, "Testing page table update using GPU\n");
-	test_pt_update(m, pt, test, true);
-
 out:
 	xe_bb_free(bb, NULL);
 free_tiny: