drm/i915/selftests: Drop igt_cs_tlb

The gt_tlb live selftest has the same code coverage as the
igt_cs_tlb subtest of gtt, except it is better at detecting
TLB bugs.  Furthermore, while igt_cs_tlb is hitting some
unforeseen issues, these issues are either false positives
due to the test being poorly formatted, or are true
positives that can be more easily diagnosed with smaller
tests.  As such, igt_cs_tlb is superceded by and obsoleted
by gt_tlb, meaning it can be removed.
Signed-off-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
Acked-by: Nirmoy Das <nirmoy.das@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230320192117.287374-1-andi.shyti@linux.intel.com

drivers/gpu/drm/i915/selftests/i915_gem_gtt.c

@@ -1940,361 +1940,6 @@ int i915_gem_gtt_mock_selftests(void)
 	return err;
 }
 
-static int context_sync(struct intel_context *ce)
-{
-	struct i915_request *rq;
-	long timeout;
-
-	rq = intel_context_create_request(ce);
-	if (IS_ERR(rq))
-		return PTR_ERR(rq);
-
-	i915_request_get(rq);
-	i915_request_add(rq);
-
-	timeout = i915_request_wait(rq, 0, HZ / 5);
-	i915_request_put(rq);
-
-	return timeout < 0 ? -EIO : 0;
-}
-
-static struct i915_request *
-submit_batch(struct intel_context *ce, u64 addr)
-{
-	struct i915_request *rq;
-	int err;
-
-	rq = intel_context_create_request(ce);
-	if (IS_ERR(rq))
-		return rq;
-
-	err = 0;
-	if (rq->engine->emit_init_breadcrumb) /* detect a hang */
-		err = rq->engine->emit_init_breadcrumb(rq);
-	if (err == 0)
-		err = rq->engine->emit_bb_start(rq, addr, 0, 0);
-
-	if (err == 0)
-		i915_request_get(rq);
-	i915_request_add(rq);
-
-	return err ? ERR_PTR(err) : rq;
-}
-
-static u32 *spinner(u32 *batch, int i)
-{
-	return batch + i * 64 / sizeof(*batch) + 4;
-}
-
-static void end_spin(u32 *batch, int i)
-{
-	*spinner(batch, i) = MI_BATCH_BUFFER_END;
-	wmb();
-}
-
-static int igt_cs_tlb(void *arg)
-{
-	const unsigned int count = PAGE_SIZE / 64;
-	const unsigned int chunk_size = count * PAGE_SIZE;
-	struct drm_i915_private *i915 = arg;
-	struct drm_i915_gem_object *bbe, *act, *out;
-	struct i915_gem_engines_iter it;
-	struct i915_address_space *vm;
-	struct i915_gem_context *ctx;
-	struct intel_context *ce;
-	struct i915_vma *vma;
-	I915_RND_STATE(prng);
-	struct file *file;
-	unsigned int i;
-	u32 *result;
-	u32 *batch;
-	int err = 0;
-
-	/*
-	 * Our mission here is to fool the hardware to execute something
-	 * from scratch as it has not seen the batch move (due to missing
-	 * the TLB invalidate).
-	 */
-
-	file = mock_file(i915);
-	if (IS_ERR(file))
-		return PTR_ERR(file);
-
-	ctx = live_context(i915, file);
-	if (IS_ERR(ctx)) {
-		err = PTR_ERR(ctx);
-		goto out_unlock;
-	}
-
-	vm = i915_gem_context_get_eb_vm(ctx);
-	if (i915_is_ggtt(vm))
-		goto out_vm;
-
-	/* Create two pages; dummy we prefill the TLB, and intended */
-	bbe = i915_gem_object_create_internal(i915, PAGE_SIZE);
-	if (IS_ERR(bbe)) {
-		err = PTR_ERR(bbe);
-		goto out_vm;
-	}
-
-	batch = i915_gem_object_pin_map_unlocked(bbe, I915_MAP_WC);
-	if (IS_ERR(batch)) {
-		err = PTR_ERR(batch);
-		goto out_put_bbe;
-	}
-	memset32(batch, MI_BATCH_BUFFER_END, PAGE_SIZE / sizeof(u32));
-	i915_gem_object_flush_map(bbe);
-	i915_gem_object_unpin_map(bbe);
-
-	act = i915_gem_object_create_internal(i915, PAGE_SIZE);
-	if (IS_ERR(act)) {
-		err = PTR_ERR(act);
-		goto out_put_bbe;
-	}
-
-	/* Track the execution of each request by writing into different slot */
-	batch = i915_gem_object_pin_map_unlocked(act, I915_MAP_WC);
-	if (IS_ERR(batch)) {
-		err = PTR_ERR(batch);
-		goto out_put_act;
-	}
-	for (i = 0; i < count; i++) {
-		u32 *cs = batch + i * 64 / sizeof(*cs);
-		u64 addr = (vm->total - PAGE_SIZE) + i * sizeof(u32);
-
-		GEM_BUG_ON(GRAPHICS_VER(i915) < 6);
-		cs[0] = MI_STORE_DWORD_IMM_GEN4;
-		if (GRAPHICS_VER(i915) >= 8) {
-			cs[1] = lower_32_bits(addr);
-			cs[2] = upper_32_bits(addr);
-			cs[3] = i;
-			cs[4] = MI_NOOP;
-			cs[5] = MI_BATCH_BUFFER_START_GEN8;
-		} else {
-			cs[1] = 0;
-			cs[2] = lower_32_bits(addr);
-			cs[3] = i;
-			cs[4] = MI_NOOP;
-			cs[5] = MI_BATCH_BUFFER_START;
-		}
-	}
-
-	out = i915_gem_object_create_internal(i915, PAGE_SIZE);
-	if (IS_ERR(out)) {
-		err = PTR_ERR(out);
-		goto out_put_batch;
-	}
-	i915_gem_object_set_cache_coherency(out, I915_CACHING_CACHED);
-
-	vma = i915_vma_instance(out, vm, NULL);
-	if (IS_ERR(vma)) {
-		err = PTR_ERR(vma);
-		goto out_put_out;
-	}
-
-	err = i915_vma_pin(vma, 0, 0,
-			   PIN_USER |
-			   PIN_OFFSET_FIXED |
-			   (vm->total - PAGE_SIZE));
-	if (err)
-		goto out_put_out;
-	GEM_BUG_ON(vma->node.start != vm->total - PAGE_SIZE);
-
-	result = i915_gem_object_pin_map_unlocked(out, I915_MAP_WB);
-	if (IS_ERR(result)) {
-		err = PTR_ERR(result);
-		goto out_put_out;
-	}
-
-	for_each_gem_engine(ce, i915_gem_context_lock_engines(ctx), it) {
-		IGT_TIMEOUT(end_time);
-		unsigned long pass = 0;
-
-		if (!intel_engine_can_store_dword(ce->engine))
-			continue;
-
-		while (!__igt_timeout(end_time, NULL)) {
-			struct i915_vm_pt_stash stash = {};
-			struct i915_request *rq;
-			struct i915_gem_ww_ctx ww;
-			struct i915_vma_resource *vma_res;
-			u64 offset;
-
-			offset = igt_random_offset(&prng,
-						   0, vm->total - PAGE_SIZE,
-						   chunk_size, PAGE_SIZE);
-
-			memset32(result, STACK_MAGIC, PAGE_SIZE / sizeof(u32));
-
-			vma = i915_vma_instance(bbe, vm, NULL);
-			if (IS_ERR(vma)) {
-				err = PTR_ERR(vma);
-				goto end;
-			}
-
-			i915_gem_object_lock(bbe, NULL);
-			err = i915_vma_get_pages(vma);
-			i915_gem_object_unlock(bbe);
-			if (err)
-				goto end;
-
-			vma_res = i915_vma_resource_alloc();
-			if (IS_ERR(vma_res)) {
-				i915_vma_put_pages(vma);
-				err = PTR_ERR(vma_res);
-				goto end;
-			}
-
-			i915_gem_ww_ctx_init(&ww, false);
-retry:
-			err = i915_vm_lock_objects(vm, &ww);
-			if (err)
-				goto end_ww;
-
-			err = i915_vm_alloc_pt_stash(vm, &stash, chunk_size);
-			if (err)
-				goto end_ww;
-
-			err = i915_vm_map_pt_stash(vm, &stash);
-			if (!err)
-				vm->allocate_va_range(vm, &stash, offset, chunk_size);
-			i915_vm_free_pt_stash(vm, &stash);
-end_ww:
-			if (err == -EDEADLK) {
-				err = i915_gem_ww_ctx_backoff(&ww);
-				if (!err)
-					goto retry;
-			}
-			i915_gem_ww_ctx_fini(&ww);
-			if (err) {
-				kfree(vma_res);
-				goto end;
-			}
-
-			i915_vma_resource_init_from_vma(vma_res, vma);
-			/* Prime the TLB with the dummy pages */
-			for (i = 0; i < count; i++) {
-				vma_res->start = offset + i * PAGE_SIZE;
-				vm->insert_entries(vm, vma_res, I915_CACHE_NONE,
-						   0);
-
-				rq = submit_batch(ce, vma_res->start);
-				if (IS_ERR(rq)) {
-					err = PTR_ERR(rq);
-					i915_vma_resource_fini(vma_res);
-					kfree(vma_res);
-					goto end;
-				}
-				i915_request_put(rq);
-			}
-			i915_vma_resource_fini(vma_res);
-			i915_vma_put_pages(vma);
-
-			err = context_sync(ce);
-			if (err) {
-				pr_err("%s: dummy setup timed out\n",
-				       ce->engine->name);
-				kfree(vma_res);
-				goto end;
-			}
-
-			vma = i915_vma_instance(act, vm, NULL);
-			if (IS_ERR(vma)) {
-				kfree(vma_res);
-				err = PTR_ERR(vma);
-				goto end;
-			}
-
-			i915_gem_object_lock(act, NULL);
-			err = i915_vma_get_pages(vma);
-			i915_gem_object_unlock(act);
-			if (err) {
-				kfree(vma_res);
-				goto end;
-			}
-
-			i915_vma_resource_init_from_vma(vma_res, vma);
-			/* Replace the TLB with target batches */
-			for (i = 0; i < count; i++) {
-				struct i915_request *rq;
-				u32 *cs = batch + i * 64 / sizeof(*cs);
-				u64 addr;
-
-				vma_res->start = offset + i * PAGE_SIZE;
-				vm->insert_entries(vm, vma_res, I915_CACHE_NONE, 0);
-
-				addr = vma_res->start + i * 64;
-				cs[4] = MI_NOOP;
-				cs[6] = lower_32_bits(addr);
-				cs[7] = upper_32_bits(addr);
-				wmb();
-
-				rq = submit_batch(ce, addr);
-				if (IS_ERR(rq)) {
-					err = PTR_ERR(rq);
-					i915_vma_resource_fini(vma_res);
-					kfree(vma_res);
-					goto end;
-				}
-
-				/* Wait until the context chain has started */
-				if (i == 0) {
-					while (READ_ONCE(result[i]) &&
-					       !i915_request_completed(rq))
-						cond_resched();
-				} else {
-					end_spin(batch, i - 1);
-				}
-
-				i915_request_put(rq);
-			}
-			end_spin(batch, count - 1);
-
-			i915_vma_resource_fini(vma_res);
-			kfree(vma_res);
-			i915_vma_put_pages(vma);
-
-			err = context_sync(ce);
-			if (err) {
-				pr_err("%s: writes timed out\n",
-				       ce->engine->name);
-				goto end;
-			}
-
-			for (i = 0; i < count; i++) {
-				if (result[i] != i) {
-					pr_err("%s: Write lost on pass %lu, at offset %llx, index %d, found %x, expected %x\n",
-					       ce->engine->name, pass,
-					       offset, i, result[i], i);
-					err = -EINVAL;
-					goto end;
-				}
-			}
-
-			vm->clear_range(vm, offset, chunk_size);
-			pass++;
-		}
-	}
-end:
-	if (igt_flush_test(i915))
-		err = -EIO;
-	i915_gem_context_unlock_engines(ctx);
-	i915_gem_object_unpin_map(out);
-out_put_out:
-	i915_gem_object_put(out);
-out_put_batch:
-	i915_gem_object_unpin_map(act);
-out_put_act:
-	i915_gem_object_put(act);
-out_put_bbe:
-	i915_gem_object_put(bbe);
-out_vm:
-	i915_vm_put(vm);
-out_unlock:
-	fput(file);
-	return err;
-}
-
 int i915_gem_gtt_live_selftests(struct drm_i915_private *i915)
 {
 	static const struct i915_subtest tests[] = {
@@ -2314,7 +1959,6 @@ int i915_gem_gtt_live_selftests(struct drm_i915_private *i915)
 		SUBTEST(igt_ggtt_fill),
 		SUBTEST(igt_ggtt_page),
 		SUBTEST(igt_ggtt_misaligned_pin),
-		SUBTEST(igt_cs_tlb),
 	};
 
 	GEM_BUG_ON(offset_in_page(to_gt(i915)->ggtt->vm.total));