RE: [Intel-gfx] [PATCH v3 2/5] drm/i915/gem: Introduce a selftest for the gem object migrate functionality

["Ruhl, Michael J" <michael.j.ruhl@intel.com>]

>-----Original Message-----
>From: Intel-gfx <intel-gfx-bounces@lists.freedesktop.org> On Behalf Of
>Thomas Hellström
>Sent: Monday, June 28, 2021 10:46 AM
>To: intel-gfx@lists.freedesktop.org; dri-devel@lists.freedesktop.org
>Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>; Auld, Matthew
><matthew.auld@intel.com>
>Subject: [Intel-gfx] [PATCH v3 2/5] drm/i915/gem: Introduce a selftest for the
>gem object migrate functionality
>
>From: Matthew Auld <matthew.auld@intel.com>
>
>A selftest for the gem object migrate functionality. Slightly adapted
>from the original by Matthew to the new interface and new fill blit
>code.
>
>Co-developed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
>Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
>Signed-off-by: Matthew Auld <matthew.auld@intel.com>
>---
> drivers/gpu/drm/i915/gem/i915_gem_object.c    |   1 +
> .../drm/i915/gem/selftests/i915_gem_migrate.c | 237
>++++++++++++++++++
> .../drm/i915/selftests/i915_live_selftests.h  |   1 +
> 3 files changed, 239 insertions(+)
> create mode 100644
>drivers/gpu/drm/i915/gem/selftests/i915_gem_migrate.c
>
>diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.c
>b/drivers/gpu/drm/i915/gem/i915_gem_object.c
>index 1c18be067b58..ff147fd59874 100644
>--- a/drivers/gpu/drm/i915/gem/i915_gem_object.c
>+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.c
>@@ -649,6 +649,7 @@ static const struct drm_gem_object_funcs
>i915_gem_object_funcs = {
> #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
> #include "selftests/huge_gem_object.c"
> #include "selftests/huge_pages.c"
>+#include "selftests/i915_gem_migrate.c"
> #include "selftests/i915_gem_object.c"
> #include "selftests/i915_gem_coherency.c"
> #endif
>diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_migrate.c
>b/drivers/gpu/drm/i915/gem/selftests/i915_gem_migrate.c
>new file mode 100644
>index 000000000000..a437b66f64d9
>--- /dev/null
>+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_migrate.c
>@@ -0,0 +1,237 @@
>+// SPDX-License-Identifier: MIT
>+/*
>+ * Copyright © 2020-2021 Intel Corporation
>+ */
>+
>+#include "gt/intel_migrate.h"
>+
>+static int igt_smem_create_migrate(void *arg)
>+{
>+	struct intel_gt *gt = arg;
>+	struct drm_i915_private *i915 = gt->i915;
>+	struct drm_i915_gem_object *obj;
>+	struct i915_gem_ww_ctx ww;
>+	int err = 0;
>+
>+	/* Switch object backing-store on create */
>+	obj = i915_gem_object_create_lmem(i915, PAGE_SIZE, 0);
>+	if (IS_ERR(obj))
>+		return PTR_ERR(obj);
>+
>+	for_i915_gem_ww(&ww, err, true) {
>+		err = i915_gem_object_lock(obj, &ww);
>+		if (err)
>+			continue;
>+
>+		if (!i915_gem_object_can_migrate(obj,
>INTEL_REGION_SMEM)) {
>+			err = -EINVAL;
>+			continue;
>+		}
>+
>+		err = i915_gem_object_migrate(obj, &ww,
>INTEL_REGION_SMEM);
>+		if (err)
>+			continue;
>+
>+		err = i915_gem_object_pin_pages(obj);
>+		if (err)
>+			continue;
>+
>+		if (i915_gem_object_can_migrate(obj,
>INTEL_REGION_LMEM))
>+			err = -EINVAL;
>+
>+		i915_gem_object_unpin_pages(obj);
>+	}
>+	i915_gem_object_put(obj);
>+
>+	return err;
>+}
>+
>+static int igt_lmem_create_migrate(void *arg)
>+{
>+	struct intel_gt *gt = arg;
>+	struct drm_i915_private *i915 = gt->i915;
>+	struct drm_i915_gem_object *obj;
>+	struct i915_gem_ww_ctx ww;
>+	int err = 0;
>+
>+	/* Switch object backing-store on create */
>+	obj = i915_gem_object_create_shmem(i915, PAGE_SIZE);
>+	if (IS_ERR(obj))
>+		return PTR_ERR(obj);
>+
>+	for_i915_gem_ww(&ww, err, true) {
>+		err = i915_gem_object_lock(obj, &ww);
>+		if (err)
>+			continue;
>+
>+		if (!i915_gem_object_can_migrate(obj,
>INTEL_REGION_LMEM)) {
>+			err = -EINVAL;
>+			continue;
>+		}
>+
>+		err = i915_gem_object_migrate(obj, &ww,
>INTEL_REGION_LMEM);
>+		if (err)
>+			continue;
>+
>+		err = i915_gem_object_pin_pages(obj);
>+		if (err)
>+			continue;
>+
>+		if (i915_gem_object_can_migrate(obj,
>INTEL_REGION_SMEM))
>+			err = -EINVAL;
>+
>+		i915_gem_object_unpin_pages(obj);
>+	}
>+	i915_gem_object_put(obj);
>+
>+	return err;
>+}
>+
>+static int lmem_pages_migrate_one(struct i915_gem_ww_ctx *ww,
>+				  struct drm_i915_gem_object *obj)
>+{
>+	int err;
>+
>+	err = i915_gem_object_lock(obj, ww);
>+	if (err)
>+		return err;
>+
>+	err = i915_gem_object_wait(obj,
>+				   I915_WAIT_INTERRUPTIBLE |
>+				   I915_WAIT_PRIORITY |
>+				   I915_WAIT_ALL,
>+				   MAX_SCHEDULE_TIMEOUT);
>+	if (err)
>+		return err;
>+
>+	if (i915_gem_object_is_lmem(obj)) {
>+		if (!i915_gem_object_can_migrate(obj,
>INTEL_REGION_SMEM)) {

I don't see any  testing of the parameter num_allowed.

Is that done somewhere else?

Mike

>+			pr_err("object can't migrate to smem.\n");
>+			return -EINVAL;
>+		}
>+
>+		err = i915_gem_object_migrate(obj, ww,
>INTEL_REGION_SMEM);
>+		if (err) {
>+			pr_err("Object failed migration to smem\n");
>+			if (err)
>+				return err;
>+		}
>+
>+		if (i915_gem_object_is_lmem(obj)) {
>+			pr_err("object still backed by lmem\n");
>+			err = -EINVAL;
>+		}
>+
>+		if (!i915_gem_object_has_struct_page(obj)) {
>+			pr_err("object not backed by struct page\n");
>+			err = -EINVAL;
>+		}
>+
>+	} else {
>+		if (!i915_gem_object_can_migrate(obj,
>INTEL_REGION_LMEM)) {
>+			pr_err("object can't migrate to lmem.\n");
>+			return -EINVAL;
>+		}
>+
>+		err = i915_gem_object_migrate(obj, ww,
>INTEL_REGION_LMEM);
>+		if (err) {
>+			pr_err("Object failed migration to lmem\n");
>+			if (err)
>+				return err;
>+		}
>+
>+		if (i915_gem_object_has_struct_page(obj)) {
>+			pr_err("object still backed by struct page\n");
>+			err = -EINVAL;
>+		}
>+
>+		if (!i915_gem_object_is_lmem(obj)) {
>+			pr_err("object not backed by lmem\n");
>+			err = -EINVAL;
>+		}
>+	}
>+
>+	return err;
>+}
>+
>+static int igt_lmem_pages_migrate(void *arg)
>+{
>+	struct intel_gt *gt = arg;
>+	struct drm_i915_private *i915 = gt->i915;
>+	struct drm_i915_gem_object *obj;
>+	struct i915_gem_ww_ctx ww;
>+	struct i915_request *rq;
>+	int err;
>+	int i;
>+
>+	/* From LMEM to shmem and back again */
>+
>+	obj = i915_gem_object_create_lmem(i915, SZ_2M, 0);
>+	if (IS_ERR(obj))
>+		return PTR_ERR(obj);
>+
>+	err = i915_gem_object_lock(obj, NULL);
>+	if (err)
>+		goto out_put;
>+
>+	err = ____i915_gem_object_get_pages(obj);
>+	if (err) {
>+		i915_gem_object_unlock(obj);
>+		goto out_put;
>+	}
>+
>+	err = intel_context_migrate_clear(gt->migrate.context, NULL,
>+					  obj->mm.pages->sgl, obj-
>>cache_level,
>+					  i915_gem_object_is_lmem(obj),
>+					  0, &rq);
>+	if (rq) {
>+		dma_resv_add_excl_fence(obj->base.resv, &rq->fence);
>+		i915_request_put(rq);
>+	}
>+	i915_gem_object_unlock(obj);
>+	if (err)
>+		goto out_put;
>+
>+	for (i = 1; i <= 4; ++i) {
>+		for_i915_gem_ww(&ww, err, true) {
>+			err = lmem_pages_migrate_one(&ww, obj);
>+			if (err)
>+				continue;
>+
>+			err = i915_gem_object_wait_migration(obj, true);
>+			if (err)
>+				continue;
>+
>+			err = intel_migrate_clear(&gt->migrate, &ww, NULL,
>+						  obj->mm.pages->sgl,
>+						  obj->cache_level,
>+
>i915_gem_object_is_lmem(obj),
>+						  0xdeadbeaf, &rq);
>+			if (rq) {
>+				dma_resv_add_excl_fence(obj->base.resv,
>+							&rq->fence);
>+				i915_request_put(rq);
>+			}
>+		}
>+		if (err)
>+			break;
>+	}
>+out_put:
>+	i915_gem_object_put(obj);
>+
>+	return err;
>+}
>+
>+int i915_gem_migrate_live_selftests(struct drm_i915_private *i915)
>+{
>+	static const struct i915_subtest tests[] = {
>+		SUBTEST(igt_smem_create_migrate),
>+		SUBTEST(igt_lmem_create_migrate),
>+		SUBTEST(igt_lmem_pages_migrate),
>+	};
>+
>+	if (!HAS_LMEM(i915))
>+		return 0;
>+
>+	return intel_gt_live_subtests(tests, &i915->gt);
>+}
>diff --git a/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
>b/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
>index a68197cf1044..e2fd1b61af71 100644
>--- a/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
>+++ b/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
>@@ -40,6 +40,7 @@ selftest(hugepages,
>i915_gem_huge_page_live_selftests)
> selftest(gem_contexts, i915_gem_context_live_selftests)
> selftest(gem_execbuf, i915_gem_execbuffer_live_selftests)
> selftest(client, i915_gem_client_blt_live_selftests)
>+selftest(gem_migrate, i915_gem_migrate_live_selftests)
> selftest(reset, intel_reset_live_selftests)
> selftest(memory_region, intel_memory_region_live_selftests)
> selftest(hangcheck, intel_hangcheck_live_selftests)
>--
>2.31.1
>
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