drivers/gpu/drm/i915/gt/selftest_engine_cs.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright © 2018 Intel Corporation
  */

 #include <linux/sort.h>

 #include "intel_gpu_commands.h"
 #include "intel_gt_pm.h"
 #include "intel_rps.h"

 #include "i915_selftest.h"
 #include "selftests/igt_flush_test.h"

 #define COUNT 5

 static int cmp_u32(const void *A, const void *B)
 {
 	const u32 *a = A, *b = B;

 	return *a - *b;
 }

 static void perf_begin(struct intel_gt *gt)
 {
 	intel_gt_pm_get(gt);

 	/* Boost gpufreq to max [waitboost] and keep it fixed */
 	atomic_inc(&gt->rps.num_waiters);
 	schedule_work(&gt->rps.work);
 	flush_work(&gt->rps.work);
 }

 static int perf_end(struct intel_gt *gt)
 {
 	atomic_dec(&gt->rps.num_waiters);
 	intel_gt_pm_put(gt);

 	return igt_flush_test(gt->i915);
 }

 static int write_timestamp(struct i915_request *rq, int slot)
 {
 	struct intel_timeline *tl =
 		rcu_dereference_protected(rq->timeline,
 					  !i915_request_signaled(rq));
 	u32 cmd;
 	u32 *cs;

 	cs = intel_ring_begin(rq, 4);
 	if (IS_ERR(cs))
 		return PTR_ERR(cs);

 	cmd = MI_STORE_REGISTER_MEM | MI_USE_GGTT;
 	if (GRAPHICS_VER(rq->engine->i915) >= 8)
 		cmd++;
 	*cs++ = cmd;
 	*cs++ = i915_mmio_reg_offset(RING_TIMESTAMP(rq->engine->mmio_base));
 	*cs++ = tl->hwsp_offset + slot * sizeof(u32);
 	*cs++ = 0;

 	intel_ring_advance(rq, cs);

 	return 0;
 }

 static struct i915_vma *create_empty_batch(struct intel_context *ce)
 {
 	struct drm_i915_gem_object *obj;
 	struct i915_vma *vma;
 	u32 *cs;
 	int err;

 	obj = i915_gem_object_create_internal(ce->engine->i915, PAGE_SIZE);
 	if (IS_ERR(obj))
 		return ERR_CAST(obj);

 	cs = i915_gem_object_pin_map_unlocked(obj, I915_MAP_WB);
 	if (IS_ERR(cs)) {
 		err = PTR_ERR(cs);
 		goto err_put;
 	}

 	cs[0] = MI_BATCH_BUFFER_END;

 	i915_gem_object_flush_map(obj);

 	vma = i915_vma_instance(obj, ce->vm, NULL);
 	if (IS_ERR(vma)) {
 		err = PTR_ERR(vma);
 		goto err_unpin;
 	}

 	err = i915_vma_pin(vma, 0, 0, PIN_USER);
 	if (err)
 		goto err_unpin;

 	i915_gem_object_unpin_map(obj);
 	return vma;

 err_unpin:
 	i915_gem_object_unpin_map(obj);
 err_put:
 	i915_gem_object_put(obj);
 	return ERR_PTR(err);
 }

 static u32 trifilter(u32 *a)
 {
 	u64 sum;

 	sort(a, COUNT, sizeof(*a), cmp_u32, NULL);

 	sum = mul_u32_u32(a[2], 2);
 	sum += a[1];
 	sum += a[3];

 	return sum >> 2;
 }

 static int perf_mi_bb_start(void *arg)
 {
 	struct intel_gt *gt = arg;
 	struct intel_engine_cs *engine;
 	enum intel_engine_id id;
 	int err = 0;

 	if (GRAPHICS_VER(gt->i915) < 7) /* for per-engine CS_TIMESTAMP */
 		return 0;

 	perf_begin(gt);
 	for_each_engine(engine, gt, id) {
 		struct intel_context *ce = engine->kernel_context;
 		struct i915_vma *batch;
 		u32 cycles[COUNT];
 		int i;

 		intel_engine_pm_get(engine);

 		batch = create_empty_batch(ce);
 		if (IS_ERR(batch)) {
 			err = PTR_ERR(batch);
 			intel_engine_pm_put(engine);
 			break;
 		}

 		err = i915_vma_sync(batch);
 		if (err) {
 			intel_engine_pm_put(engine);
 			i915_vma_put(batch);
 			break;
 		}

 		for (i = 0; i < ARRAY_SIZE(cycles); i++) {
 			struct i915_request *rq;

 			rq = i915_request_create(ce);
 			if (IS_ERR(rq)) {
 				err = PTR_ERR(rq);
 				break;
 			}

 			err = write_timestamp(rq, 2);
 			if (err)
 				goto out;

 			err = rq->engine->emit_bb_start(rq,
 							batch->node.start, 8,
 							0);
 			if (err)
 				goto out;

 			err = write_timestamp(rq, 3);
 			if (err)
 				goto out;

 out:
 			i915_request_get(rq);
 			i915_request_add(rq);

 			if (i915_request_wait(rq, 0, HZ / 5) < 0)
 				err = -EIO;
 			i915_request_put(rq);
 			if (err)
 				break;

 			cycles[i] = rq->hwsp_seqno[3] - rq->hwsp_seqno[2];
 		}
 		i915_vma_put(batch);
 		intel_engine_pm_put(engine);
 		if (err)
 			break;

 		pr_info("%s: MI_BB_START cycles: %u\n",
 			engine->name, trifilter(cycles));
 	}
 	if (perf_end(gt))
 		err = -EIO;

 	return err;
 }

 static struct i915_vma *create_nop_batch(struct intel_context *ce)
 {
 	struct drm_i915_gem_object *obj;
 	struct i915_vma *vma;
 	u32 *cs;
 	int err;

 	obj = i915_gem_object_create_internal(ce->engine->i915, SZ_64K);
 	if (IS_ERR(obj))
 		return ERR_CAST(obj);

 	cs = i915_gem_object_pin_map_unlocked(obj, I915_MAP_WB);
 	if (IS_ERR(cs)) {
 		err = PTR_ERR(cs);
 		goto err_put;
 	}

 	memset(cs, 0, SZ_64K);
 	cs[SZ_64K / sizeof(*cs) - 1] = MI_BATCH_BUFFER_END;

 	i915_gem_object_flush_map(obj);

 	vma = i915_vma_instance(obj, ce->vm, NULL);
 	if (IS_ERR(vma)) {
 		err = PTR_ERR(vma);
 		goto err_unpin;
 	}

 	err = i915_vma_pin(vma, 0, 0, PIN_USER);
 	if (err)
 		goto err_unpin;

 	i915_gem_object_unpin_map(obj);
 	return vma;

 err_unpin:
 	i915_gem_object_unpin_map(obj);
 err_put:
 	i915_gem_object_put(obj);
 	return ERR_PTR(err);
 }

 static int perf_mi_noop(void *arg)
 {
 	struct intel_gt *gt = arg;
 	struct intel_engine_cs *engine;
 	enum intel_engine_id id;
 	int err = 0;

 	if (GRAPHICS_VER(gt->i915) < 7) /* for per-engine CS_TIMESTAMP */
 		return 0;

 	perf_begin(gt);
 	for_each_engine(engine, gt, id) {
 		struct intel_context *ce = engine->kernel_context;
 		struct i915_vma *base, *nop;
 		u32 cycles[COUNT];
 		int i;

 		intel_engine_pm_get(engine);

 		base = create_empty_batch(ce);
 		if (IS_ERR(base)) {
 			err = PTR_ERR(base);
 			intel_engine_pm_put(engine);
 			break;
 		}

 		err = i915_vma_sync(base);
 		if (err) {
 			i915_vma_put(base);
 			intel_engine_pm_put(engine);
 			break;
 		}

 		nop = create_nop_batch(ce);
 		if (IS_ERR(nop)) {
 			err = PTR_ERR(nop);
 			i915_vma_put(base);
 			intel_engine_pm_put(engine);
 			break;
 		}

 		err = i915_vma_sync(nop);
 		if (err) {
 			i915_vma_put(nop);
 			i915_vma_put(base);
 			intel_engine_pm_put(engine);
 			break;
 		}

 		for (i = 0; i < ARRAY_SIZE(cycles); i++) {
 			struct i915_request *rq;

 			rq = i915_request_create(ce);
 			if (IS_ERR(rq)) {
 				err = PTR_ERR(rq);
 				break;
 			}

 			err = write_timestamp(rq, 2);
 			if (err)
 				goto out;

 			err = rq->engine->emit_bb_start(rq,
 							base->node.start, 8,
 							0);
 			if (err)
 				goto out;

 			err = write_timestamp(rq, 3);
 			if (err)
 				goto out;

 			err = rq->engine->emit_bb_start(rq,
 							nop->node.start,
 							nop->node.size,
 							0);
 			if (err)
 				goto out;

 			err = write_timestamp(rq, 4);
 			if (err)
 				goto out;

 out:
 			i915_request_get(rq);
 			i915_request_add(rq);

 			if (i915_request_wait(rq, 0, HZ / 5) < 0)
 				err = -EIO;
 			i915_request_put(rq);
 			if (err)
 				break;

 			cycles[i] =
 				(rq->hwsp_seqno[4] - rq->hwsp_seqno[3]) -
 				(rq->hwsp_seqno[3] - rq->hwsp_seqno[2]);
 		}
 		i915_vma_put(nop);
 		i915_vma_put(base);
 		intel_engine_pm_put(engine);
 		if (err)
 			break;

 		pr_info("%s: 16K MI_NOOP cycles: %u\n",
 			engine->name, trifilter(cycles));
 	}
 	if (perf_end(gt))
 		err = -EIO;

 	return err;
 }

 int intel_engine_cs_perf_selftests(struct drm_i915_private *i915)
 {
 	static const struct i915_subtest tests[] = {
 		SUBTEST(perf_mi_bb_start),
 		SUBTEST(perf_mi_noop),
 	};

 	if (intel_gt_is_wedged(&i915->gt))
 		return 0;

 	return intel_gt_live_subtests(tests, &i915->gt);
 }

 static int intel_mmio_bases_check(void *arg)
 {
 	int i, j;

 	for (i = 0; i < ARRAY_SIZE(intel_engines); i++) {
 		const struct engine_info *info = &intel_engines[i];
 		u8 prev = U8_MAX;

 		for (j = 0; j < MAX_MMIO_BASES; j++) {
 			u8 ver = info->mmio_bases[j].graphics_ver;
 			u32 base = info->mmio_bases[j].base;

 			if (ver >= prev) {
 				pr_err("%s(%s, class:%d, instance:%d): mmio base for graphics ver %u is before the one for ver %u\n",
 				       __func__,
 				       intel_engine_class_repr(info->class),
 				       info->class, info->instance,
 				       prev, ver);
 				return -EINVAL;
 			}

 			if (ver == 0)
 				break;

 			if (!base) {
 				pr_err("%s(%s, class:%d, instance:%d): invalid mmio base (%x) for graphics ver %u at entry %u\n",
 				       __func__,
 				       intel_engine_class_repr(info->class),
 				       info->class, info->instance,
 				       base, ver, j);
 				return -EINVAL;
 			}

 			prev = ver;
 		}

 		pr_debug("%s: min graphics version supported for %s%d is %u\n",
 			 __func__,
 			 intel_engine_class_repr(info->class),
 			 info->instance,
 			 prev);
 	}

 	return 0;
 }

 int intel_engine_cs_mock_selftests(void)
 {
 	static const struct i915_subtest tests[] = {
 		SUBTEST(intel_mmio_bases_check),
 	};

 	return i915_subtests(tests, NULL);
 }
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright © 2018 Intel Corporation
	*/

	#include <linux/sort.h>

	#include "intel_gpu_commands.h"
	#include "intel_gt_pm.h"
	#include "intel_rps.h"

	#include "i915_selftest.h"
	#include "selftests/igt_flush_test.h"

	#define COUNT 5

	static int cmp_u32(const void A, const void B)
	{
	const u32 a = A, b = B;

	return a - b;
	}

	static void perf_begin(struct intel_gt *gt)
	{
	intel_gt_pm_get(gt);

	/* Boost gpufreq to max [waitboost] and keep it fixed */
	atomic_inc(&gt->rps.num_waiters);
	schedule_work(&gt->rps.work);
	flush_work(&gt->rps.work);
	}

	static int perf_end(struct intel_gt *gt)
	{
	atomic_dec(&gt->rps.num_waiters);
	intel_gt_pm_put(gt);

	return igt_flush_test(gt->i915);
	}

	static int write_timestamp(struct i915_request *rq, int slot)
	{
	struct intel_timeline *tl =
	rcu_dereference_protected(rq->timeline,
	!i915_request_signaled(rq));
	u32 cmd;
	u32 *cs;

	cs = intel_ring_begin(rq, 4);
	if (IS_ERR(cs))
	return PTR_ERR(cs);

	cmd = MI_STORE_REGISTER_MEM \| MI_USE_GGTT;
	if (GRAPHICS_VER(rq->engine->i915) >= 8)
	cmd++;
	*cs++ = cmd;
	*cs++ = i915_mmio_reg_offset(RING_TIMESTAMP(rq->engine->mmio_base));
	cs++ = tl->hwsp_offset + slot sizeof(u32);
	*cs++ = 0;

	intel_ring_advance(rq, cs);

	return 0;
	}

	static struct i915_vma create_empty_batch(struct intel_context ce)
	{
	struct drm_i915_gem_object *obj;
	struct i915_vma *vma;
	u32 *cs;
	int err;

	obj = i915_gem_object_create_internal(ce->engine->i915, PAGE_SIZE);
	if (IS_ERR(obj))
	return ERR_CAST(obj);

	cs = i915_gem_object_pin_map_unlocked(obj, I915_MAP_WB);
	if (IS_ERR(cs)) {
	err = PTR_ERR(cs);
	goto err_put;
	}

	cs[0] = MI_BATCH_BUFFER_END;

	i915_gem_object_flush_map(obj);

	vma = i915_vma_instance(obj, ce->vm, NULL);
	if (IS_ERR(vma)) {
	err = PTR_ERR(vma);
	goto err_unpin;
	}

	err = i915_vma_pin(vma, 0, 0, PIN_USER);
	if (err)
	goto err_unpin;

	i915_gem_object_unpin_map(obj);
	return vma;

	err_unpin:
	i915_gem_object_unpin_map(obj);
	err_put:
	i915_gem_object_put(obj);
	return ERR_PTR(err);
	}

	static u32 trifilter(u32 *a)
	{
	u64 sum;

	sort(a, COUNT, sizeof(*a), cmp_u32, NULL);

	sum = mul_u32_u32(a[2], 2);
	sum += a[1];
	sum += a[3];

	return sum >> 2;
	}

	static int perf_mi_bb_start(void *arg)
	{
	struct intel_gt *gt = arg;
	struct intel_engine_cs *engine;
	enum intel_engine_id id;
	int err = 0;

	if (GRAPHICS_VER(gt->i915) < 7) /* for per-engine CS_TIMESTAMP */
	return 0;

	perf_begin(gt);
	for_each_engine(engine, gt, id) {
	struct intel_context *ce = engine->kernel_context;
	struct i915_vma *batch;
	u32 cycles[COUNT];
	int i;

	intel_engine_pm_get(engine);

	batch = create_empty_batch(ce);
	if (IS_ERR(batch)) {
	err = PTR_ERR(batch);
	intel_engine_pm_put(engine);
	break;
	}

	err = i915_vma_sync(batch);
	if (err) {
	intel_engine_pm_put(engine);
	i915_vma_put(batch);
	break;
	}

	for (i = 0; i < ARRAY_SIZE(cycles); i++) {
	struct i915_request *rq;

	rq = i915_request_create(ce);
	if (IS_ERR(rq)) {
	err = PTR_ERR(rq);
	break;
	}

	err = write_timestamp(rq, 2);
	if (err)
	goto out;

	err = rq->engine->emit_bb_start(rq,
	batch->node.start, 8,
	0);
	if (err)
	goto out;

	err = write_timestamp(rq, 3);
	if (err)
	goto out;

	out:
	i915_request_get(rq);
	i915_request_add(rq);

	if (i915_request_wait(rq, 0, HZ / 5) < 0)
	err = -EIO;
	i915_request_put(rq);
	if (err)
	break;

	cycles[i] = rq->hwsp_seqno[3] - rq->hwsp_seqno[2];
	}
	i915_vma_put(batch);
	intel_engine_pm_put(engine);
	if (err)
	break;

	pr_info("%s: MI_BB_START cycles: %u\n",
	engine->name, trifilter(cycles));
	}
	if (perf_end(gt))
	err = -EIO;

	return err;
	}

	static struct i915_vma create_nop_batch(struct intel_context ce)
	{
	struct drm_i915_gem_object *obj;
	struct i915_vma *vma;
	u32 *cs;
	int err;

	obj = i915_gem_object_create_internal(ce->engine->i915, SZ_64K);
	if (IS_ERR(obj))
	return ERR_CAST(obj);

	cs = i915_gem_object_pin_map_unlocked(obj, I915_MAP_WB);
	if (IS_ERR(cs)) {
	err = PTR_ERR(cs);
	goto err_put;
	}

	memset(cs, 0, SZ_64K);
	cs[SZ_64K / sizeof(*cs) - 1] = MI_BATCH_BUFFER_END;

	i915_gem_object_flush_map(obj);

	vma = i915_vma_instance(obj, ce->vm, NULL);
	if (IS_ERR(vma)) {
	err = PTR_ERR(vma);
	goto err_unpin;
	}

	err = i915_vma_pin(vma, 0, 0, PIN_USER);
	if (err)
	goto err_unpin;

	i915_gem_object_unpin_map(obj);
	return vma;

	err_unpin:
	i915_gem_object_unpin_map(obj);
	err_put:
	i915_gem_object_put(obj);
	return ERR_PTR(err);
	}

	static int perf_mi_noop(void *arg)
	{
	struct intel_gt *gt = arg;
	struct intel_engine_cs *engine;
	enum intel_engine_id id;
	int err = 0;

	if (GRAPHICS_VER(gt->i915) < 7) /* for per-engine CS_TIMESTAMP */
	return 0;

	perf_begin(gt);
	for_each_engine(engine, gt, id) {
	struct intel_context *ce = engine->kernel_context;
	struct i915_vma base, nop;
	u32 cycles[COUNT];
	int i;

	intel_engine_pm_get(engine);

	base = create_empty_batch(ce);
	if (IS_ERR(base)) {
	err = PTR_ERR(base);
	intel_engine_pm_put(engine);
	break;
	}

	err = i915_vma_sync(base);
	if (err) {
	i915_vma_put(base);
	intel_engine_pm_put(engine);
	break;
	}

	nop = create_nop_batch(ce);
	if (IS_ERR(nop)) {
	err = PTR_ERR(nop);
	i915_vma_put(base);
	intel_engine_pm_put(engine);
	break;
	}

	err = i915_vma_sync(nop);
	if (err) {
	i915_vma_put(nop);
	i915_vma_put(base);
	intel_engine_pm_put(engine);
	break;
	}

	for (i = 0; i < ARRAY_SIZE(cycles); i++) {
	struct i915_request *rq;

	rq = i915_request_create(ce);
	if (IS_ERR(rq)) {
	err = PTR_ERR(rq);
	break;
	}

	err = write_timestamp(rq, 2);
	if (err)
	goto out;

	err = rq->engine->emit_bb_start(rq,
	base->node.start, 8,
	0);
	if (err)
	goto out;

	err = write_timestamp(rq, 3);
	if (err)
	goto out;

	err = rq->engine->emit_bb_start(rq,
	nop->node.start,
	nop->node.size,
	0);
	if (err)
	goto out;

	err = write_timestamp(rq, 4);
	if (err)
	goto out;

	out:
	i915_request_get(rq);
	i915_request_add(rq);

	if (i915_request_wait(rq, 0, HZ / 5) < 0)
	err = -EIO;
	i915_request_put(rq);
	if (err)
	break;

	cycles[i] =
	(rq->hwsp_seqno[4] - rq->hwsp_seqno[3]) -
	(rq->hwsp_seqno[3] - rq->hwsp_seqno[2]);
	}
	i915_vma_put(nop);
	i915_vma_put(base);
	intel_engine_pm_put(engine);
	if (err)
	break;

	pr_info("%s: 16K MI_NOOP cycles: %u\n",
	engine->name, trifilter(cycles));
	}
	if (perf_end(gt))
	err = -EIO;

	return err;
	}

	int intel_engine_cs_perf_selftests(struct drm_i915_private *i915)
	{
	static const struct i915_subtest tests[] = {
	SUBTEST(perf_mi_bb_start),
	SUBTEST(perf_mi_noop),
	};

	if (intel_gt_is_wedged(&i915->gt))
	return 0;

	return intel_gt_live_subtests(tests, &i915->gt);
	}

	static int intel_mmio_bases_check(void *arg)
	{
	int i, j;

	for (i = 0; i < ARRAY_SIZE(intel_engines); i++) {
	const struct engine_info *info = &intel_engines[i];
	u8 prev = U8_MAX;

	for (j = 0; j < MAX_MMIO_BASES; j++) {
	u8 ver = info->mmio_bases[j].graphics_ver;
	u32 base = info->mmio_bases[j].base;

	if (ver >= prev) {
	pr_err("%s(%s, class:%d, instance:%d): mmio base for graphics ver %u is before the one for ver %u\n",
	__func__,
	intel_engine_class_repr(info->class),
	info->class, info->instance,
	prev, ver);
	return -EINVAL;
	}

	if (ver == 0)
	break;

	if (!base) {
	pr_err("%s(%s, class:%d, instance:%d): invalid mmio base (%x) for graphics ver %u at entry %u\n",
	__func__,
	intel_engine_class_repr(info->class),
	info->class, info->instance,
	base, ver, j);
	return -EINVAL;
	}

	prev = ver;
	}

	pr_debug("%s: min graphics version supported for %s%d is %u\n",
	__func__,
	intel_engine_class_repr(info->class),
	info->instance,
	prev);
	}

	return 0;
	}

	int intel_engine_cs_mock_selftests(void)
	{
	static const struct i915_subtest tests[] = {
	SUBTEST(intel_mmio_bases_check),
	};

	return i915_subtests(tests, NULL);
	}