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

 /*
  * SPDX-License-Identifier: MIT
  *
  * Copyright © 2019 Intel Corporation
  */

 #include "gt/intel_engine_pm.h"
 #include "i915_selftest.h"

 #include "gem/selftests/mock_context.h"
 #include "selftests/igt_reset.h"
 #include "selftests/igt_spinner.h"

 struct live_mocs {
 	struct drm_i915_mocs_table mocs;
 	struct drm_i915_mocs_table l3cc;
 	struct i915_vma *scratch;
 	void *vaddr;
 };

 static struct intel_context *mocs_context_create(struct intel_engine_cs *engine)
 {
 	struct intel_context *ce;

 	ce = intel_context_create(engine);
 	if (IS_ERR(ce))
 		return ce;

 	/* We build large requests to read the registers from the ring */
 	ce->ring = __intel_context_ring_size(SZ_16K);

 	return ce;
 }

 static int request_add_sync(struct i915_request *rq, int err)
 {
 	i915_request_get(rq);
 	i915_request_add(rq);
 	if (i915_request_wait(rq, 0, HZ / 5) < 0)
 		err = -ETIME;
 	i915_request_put(rq);

 	return err;
 }

 static int request_add_spin(struct i915_request *rq, struct igt_spinner *spin)
 {
 	int err = 0;

 	i915_request_get(rq);
 	i915_request_add(rq);
 	if (spin && !igt_wait_for_spinner(spin, rq))
 		err = -ETIME;
 	i915_request_put(rq);

 	return err;
 }

 static struct i915_vma *create_scratch(struct intel_gt *gt)
 {
 	struct drm_i915_gem_object *obj;
 	struct i915_vma *vma;
 	int err;

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

 	i915_gem_object_set_cache_coherency(obj, I915_CACHING_CACHED);

 	vma = i915_vma_instance(obj, &gt->ggtt->vm, NULL);
 	if (IS_ERR(vma)) {
 		i915_gem_object_put(obj);
 		return vma;
 	}

 	err = i915_vma_pin(vma, 0, 0, PIN_GLOBAL);
 	if (err) {
 		i915_gem_object_put(obj);
 		return ERR_PTR(err);
 	}

 	return vma;
 }

 static int live_mocs_init(struct live_mocs *arg, struct intel_gt *gt)
 {
 	struct drm_i915_mocs_table table;
 	unsigned int flags;
 	int err;

 	memset(arg, 0, sizeof(*arg));

 	flags = get_mocs_settings(gt->i915, &table);
 	if (!flags)
 		return -EINVAL;

 	if (flags & HAS_RENDER_L3CC)
 		arg->l3cc = table;

 	if (flags & (HAS_GLOBAL_MOCS | HAS_ENGINE_MOCS))
 		arg->mocs = table;

 	arg->scratch = create_scratch(gt);
 	if (IS_ERR(arg->scratch))
 		return PTR_ERR(arg->scratch);

 	arg->vaddr = i915_gem_object_pin_map(arg->scratch->obj, I915_MAP_WB);
 	if (IS_ERR(arg->vaddr)) {
 		err = PTR_ERR(arg->vaddr);
 		goto err_scratch;
 	}

 	return 0;

 err_scratch:
 	i915_vma_unpin_and_release(&arg->scratch, 0);
 	return err;
 }

 static void live_mocs_fini(struct live_mocs *arg)
 {
 	i915_vma_unpin_and_release(&arg->scratch, I915_VMA_RELEASE_MAP);
 }

 static int read_regs(struct i915_request *rq,
 		     u32 addr, unsigned int count,
 		     uint32_t *offset)
 {
 	unsigned int i;
 	u32 *cs;

 	GEM_BUG_ON(!IS_ALIGNED(*offset, sizeof(u32)));

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

 	for (i = 0; i < count; i++) {
 		*cs++ = MI_STORE_REGISTER_MEM_GEN8 | MI_USE_GGTT;
 		*cs++ = addr;
 		*cs++ = *offset;
 		*cs++ = 0;

 		addr += sizeof(u32);
 		*offset += sizeof(u32);
 	}

 	intel_ring_advance(rq, cs);

 	return 0;
 }

 static int read_mocs_table(struct i915_request *rq,
 			   const struct drm_i915_mocs_table *table,
 			   uint32_t *offset)
 {
 	u32 addr;

 	if (HAS_GLOBAL_MOCS_REGISTERS(rq->engine->i915))
 		addr = global_mocs_offset();
 	else
 		addr = mocs_offset(rq->engine);

 	return read_regs(rq, addr, table->n_entries, offset);
 }

 static int read_l3cc_table(struct i915_request *rq,
 			   const struct drm_i915_mocs_table *table,
 			   uint32_t *offset)
 {
 	u32 addr = i915_mmio_reg_offset(GEN9_LNCFCMOCS(0));

 	return read_regs(rq, addr, (table->n_entries + 1) / 2, offset);
 }

 static int check_mocs_table(struct intel_engine_cs *engine,
 			    const struct drm_i915_mocs_table *table,
 			    uint32_t **vaddr)
 {
 	unsigned int i;
 	u32 expect;

 	for_each_mocs(expect, table, i) {
 		if (**vaddr != expect) {
 			pr_err("%s: Invalid MOCS[%d] entry, found %08x, expected %08x\n",
 			       engine->name, i, **vaddr, expect);
 			return -EINVAL;
 		}
 		++*vaddr;
 	}

 	return 0;
 }

 static bool mcr_range(struct drm_i915_private *i915, u32 offset)
 {
 	/*
 	 * Registers in this range are affected by the MCR selector
 	 * which only controls CPU initiated MMIO. Routing does not
 	 * work for CS access so we cannot verify them on this path.
 	 */
 	return INTEL_GEN(i915) >= 8 && offset >= 0xb000 && offset <= 0xb4ff;
 }

 static int check_l3cc_table(struct intel_engine_cs *engine,
 			    const struct drm_i915_mocs_table *table,
 			    uint32_t **vaddr)
 {
 	/* Can we read the MCR range 0xb00 directly? See intel_workarounds! */
 	u32 reg = i915_mmio_reg_offset(GEN9_LNCFCMOCS(0));
 	unsigned int i;
 	u32 expect;

 	for_each_l3cc(expect, table, i) {
 		if (!mcr_range(engine->i915, reg) && **vaddr != expect) {
 			pr_err("%s: Invalid L3CC[%d] entry, found %08x, expected %08x\n",
 			       engine->name, i, **vaddr, expect);
 			return -EINVAL;
 		}
 		++*vaddr;
 		reg += 4;
 	}

 	return 0;
 }

 static int check_mocs_engine(struct live_mocs *arg,
 			     struct intel_context *ce)
 {
 	struct i915_vma *vma = arg->scratch;
 	struct i915_request *rq;
 	u32 offset;
 	u32 *vaddr;
 	int err;

 	memset32(arg->vaddr, STACK_MAGIC, PAGE_SIZE / sizeof(u32));

 	rq = intel_context_create_request(ce);
 	if (IS_ERR(rq))
 		return PTR_ERR(rq);

 	i915_vma_lock(vma);
 	err = i915_request_await_object(rq, vma->obj, true);
 	if (!err)
 		err = i915_vma_move_to_active(vma, rq, EXEC_OBJECT_WRITE);
 	i915_vma_unlock(vma);

 	/* Read the mocs tables back using SRM */
 	offset = i915_ggtt_offset(vma);
 	if (!err)
 		err = read_mocs_table(rq, &arg->mocs, &offset);
 	if (!err && ce->engine->class == RENDER_CLASS)
 		err = read_l3cc_table(rq, &arg->l3cc, &offset);
 	offset -= i915_ggtt_offset(vma);
 	GEM_BUG_ON(offset > PAGE_SIZE);

 	err = request_add_sync(rq, err);
 	if (err)
 		return err;

 	/* Compare the results against the expected tables */
 	vaddr = arg->vaddr;
 	if (!err)
 		err = check_mocs_table(ce->engine, &arg->mocs, &vaddr);
 	if (!err && ce->engine->class == RENDER_CLASS)
 		err = check_l3cc_table(ce->engine, &arg->l3cc, &vaddr);
 	if (err)
 		return err;

 	GEM_BUG_ON(arg->vaddr + offset != vaddr);
 	return 0;
 }

 static int live_mocs_kernel(void *arg)
 {
 	struct intel_gt *gt = arg;
 	struct intel_engine_cs *engine;
 	enum intel_engine_id id;
 	struct live_mocs mocs;
 	int err;

 	/* Basic check the system is configured with the expected mocs table */

 	err = live_mocs_init(&mocs, gt);
 	if (err)
 		return err;

 	for_each_engine(engine, gt, id) {
 		intel_engine_pm_get(engine);
 		err = check_mocs_engine(&mocs, engine->kernel_context);
 		intel_engine_pm_put(engine);
 		if (err)
 			break;
 	}

 	live_mocs_fini(&mocs);
 	return err;
 }

 static int live_mocs_clean(void *arg)
 {
 	struct intel_gt *gt = arg;
 	struct intel_engine_cs *engine;
 	enum intel_engine_id id;
 	struct live_mocs mocs;
 	int err;

 	/* Every new context should see the same mocs table */

 	err = live_mocs_init(&mocs, gt);
 	if (err)
 		return err;

 	for_each_engine(engine, gt, id) {
 		struct intel_context *ce;

 		ce = mocs_context_create(engine);
 		if (IS_ERR(ce)) {
 			err = PTR_ERR(ce);
 			break;
 		}

 		err = check_mocs_engine(&mocs, ce);
 		intel_context_put(ce);
 		if (err)
 			break;
 	}

 	live_mocs_fini(&mocs);
 	return err;
 }

 static int active_engine_reset(struct intel_context *ce,
 			       const char *reason)
 {
 	struct igt_spinner spin;
 	struct i915_request *rq;
 	int err;

 	err = igt_spinner_init(&spin, ce->engine->gt);
 	if (err)
 		return err;

 	rq = igt_spinner_create_request(&spin, ce, MI_NOOP);
 	if (IS_ERR(rq)) {
 		igt_spinner_fini(&spin);
 		return PTR_ERR(rq);
 	}

 	err = request_add_spin(rq, &spin);
 	if (err == 0)
 		err = intel_engine_reset(ce->engine, reason);

 	igt_spinner_end(&spin);
 	igt_spinner_fini(&spin);

 	return err;
 }

 static int __live_mocs_reset(struct live_mocs *mocs,
 			     struct intel_context *ce)
 {
 	int err;

 	err = intel_engine_reset(ce->engine, "mocs");
 	if (err)
 		return err;

 	err = check_mocs_engine(mocs, ce);
 	if (err)
 		return err;

 	err = active_engine_reset(ce, "mocs");
 	if (err)
 		return err;

 	err = check_mocs_engine(mocs, ce);
 	if (err)
 		return err;

 	intel_gt_reset(ce->engine->gt, ce->engine->mask, "mocs");

 	err = check_mocs_engine(mocs, ce);
 	if (err)
 		return err;

 	return 0;
 }

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

 	/* Check the mocs setup is retained over per-engine and global resets */

 	if (!intel_has_reset_engine(gt))
 		return 0;

 	err = live_mocs_init(&mocs, gt);
 	if (err)
 		return err;

 	igt_global_reset_lock(gt);
 	for_each_engine(engine, gt, id) {
 		struct intel_context *ce;

 		ce = mocs_context_create(engine);
 		if (IS_ERR(ce)) {
 			err = PTR_ERR(ce);
 			break;
 		}

 		intel_engine_pm_get(engine);
 		err = __live_mocs_reset(&mocs, ce);
 		intel_engine_pm_put(engine);

 		intel_context_put(ce);
 		if (err)
 			break;
 	}
 	igt_global_reset_unlock(gt);

 	live_mocs_fini(&mocs);
 	return err;
 }

 int intel_mocs_live_selftests(struct drm_i915_private *i915)
 {
 	static const struct i915_subtest tests[] = {
 		SUBTEST(live_mocs_kernel),
 		SUBTEST(live_mocs_clean),
 		SUBTEST(live_mocs_reset),
 	};
 	struct drm_i915_mocs_table table;

 	if (!get_mocs_settings(i915, &table))
 		return 0;

 	return intel_gt_live_subtests(tests, &i915->gt);
 }
	/*
	* SPDX-License-Identifier: MIT
	*
	* Copyright © 2019 Intel Corporation
	*/

	#include "gt/intel_engine_pm.h"
	#include "i915_selftest.h"

	#include "gem/selftests/mock_context.h"
	#include "selftests/igt_reset.h"
	#include "selftests/igt_spinner.h"

	struct live_mocs {
	struct drm_i915_mocs_table mocs;
	struct drm_i915_mocs_table l3cc;
	struct i915_vma *scratch;
	void *vaddr;
	};

	static struct intel_context mocs_context_create(struct intel_engine_cs engine)
	{
	struct intel_context *ce;

	ce = intel_context_create(engine);
	if (IS_ERR(ce))
	return ce;

	/* We build large requests to read the registers from the ring */
	ce->ring = __intel_context_ring_size(SZ_16K);

	return ce;
	}

	static int request_add_sync(struct i915_request *rq, int err)
	{
	i915_request_get(rq);
	i915_request_add(rq);
	if (i915_request_wait(rq, 0, HZ / 5) < 0)
	err = -ETIME;
	i915_request_put(rq);

	return err;
	}

	static int request_add_spin(struct i915_request rq, struct igt_spinner spin)
	{
	int err = 0;

	i915_request_get(rq);
	i915_request_add(rq);
	if (spin && !igt_wait_for_spinner(spin, rq))
	err = -ETIME;
	i915_request_put(rq);

	return err;
	}

	static struct i915_vma create_scratch(struct intel_gt gt)
	{
	struct drm_i915_gem_object *obj;
	struct i915_vma *vma;
	int err;

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

	i915_gem_object_set_cache_coherency(obj, I915_CACHING_CACHED);

	vma = i915_vma_instance(obj, &gt->ggtt->vm, NULL);
	if (IS_ERR(vma)) {
	i915_gem_object_put(obj);
	return vma;
	}

	err = i915_vma_pin(vma, 0, 0, PIN_GLOBAL);
	if (err) {
	i915_gem_object_put(obj);
	return ERR_PTR(err);
	}

	return vma;
	}

	static int live_mocs_init(struct live_mocs arg, struct intel_gt gt)
	{
	struct drm_i915_mocs_table table;
	unsigned int flags;
	int err;

	memset(arg, 0, sizeof(*arg));

	flags = get_mocs_settings(gt->i915, &table);
	if (!flags)
	return -EINVAL;

	if (flags & HAS_RENDER_L3CC)
	arg->l3cc = table;

	if (flags & (HAS_GLOBAL_MOCS \| HAS_ENGINE_MOCS))
	arg->mocs = table;

	arg->scratch = create_scratch(gt);
	if (IS_ERR(arg->scratch))
	return PTR_ERR(arg->scratch);

	arg->vaddr = i915_gem_object_pin_map(arg->scratch->obj, I915_MAP_WB);
	if (IS_ERR(arg->vaddr)) {
	err = PTR_ERR(arg->vaddr);
	goto err_scratch;
	}

	return 0;

	err_scratch:
	i915_vma_unpin_and_release(&arg->scratch, 0);
	return err;
	}

	static void live_mocs_fini(struct live_mocs *arg)
	{
	i915_vma_unpin_and_release(&arg->scratch, I915_VMA_RELEASE_MAP);
	}

	static int read_regs(struct i915_request *rq,
	u32 addr, unsigned int count,
	uint32_t *offset)
	{
	unsigned int i;
	u32 *cs;

	GEM_BUG_ON(!IS_ALIGNED(*offset, sizeof(u32)));

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

	for (i = 0; i < count; i++) {
	*cs++ = MI_STORE_REGISTER_MEM_GEN8 \| MI_USE_GGTT;
	*cs++ = addr;
	cs++ = offset;
	*cs++ = 0;

	addr += sizeof(u32);
	*offset += sizeof(u32);
	}

	intel_ring_advance(rq, cs);

	return 0;
	}

	static int read_mocs_table(struct i915_request *rq,
	const struct drm_i915_mocs_table *table,
	uint32_t *offset)
	{
	u32 addr;

	if (HAS_GLOBAL_MOCS_REGISTERS(rq->engine->i915))
	addr = global_mocs_offset();
	else
	addr = mocs_offset(rq->engine);

	return read_regs(rq, addr, table->n_entries, offset);
	}

	static int read_l3cc_table(struct i915_request *rq,
	const struct drm_i915_mocs_table *table,
	uint32_t *offset)
	{
	u32 addr = i915_mmio_reg_offset(GEN9_LNCFCMOCS(0));

	return read_regs(rq, addr, (table->n_entries + 1) / 2, offset);
	}

	static int check_mocs_table(struct intel_engine_cs *engine,
	const struct drm_i915_mocs_table *table,
	uint32_t **vaddr)
	{
	unsigned int i;
	u32 expect;

	for_each_mocs(expect, table, i) {
	if (**vaddr != expect) {
	pr_err("%s: Invalid MOCS[%d] entry, found %08x, expected %08x\n",
	engine->name, i, **vaddr, expect);
	return -EINVAL;
	}
	++*vaddr;
	}

	return 0;
	}

	static bool mcr_range(struct drm_i915_private *i915, u32 offset)
	{
	/*
	* Registers in this range are affected by the MCR selector
	* which only controls CPU initiated MMIO. Routing does not
	* work for CS access so we cannot verify them on this path.
	*/
	return INTEL_GEN(i915) >= 8 && offset >= 0xb000 && offset <= 0xb4ff;
	}

	static int check_l3cc_table(struct intel_engine_cs *engine,
	const struct drm_i915_mocs_table *table,
	uint32_t **vaddr)
	{
	/* Can we read the MCR range 0xb00 directly? See intel_workarounds! */
	u32 reg = i915_mmio_reg_offset(GEN9_LNCFCMOCS(0));
	unsigned int i;
	u32 expect;

	for_each_l3cc(expect, table, i) {
	if (!mcr_range(engine->i915, reg) && **vaddr != expect) {
	pr_err("%s: Invalid L3CC[%d] entry, found %08x, expected %08x\n",
	engine->name, i, **vaddr, expect);
	return -EINVAL;
	}
	++*vaddr;
	reg += 4;
	}

	return 0;
	}

	static int check_mocs_engine(struct live_mocs *arg,
	struct intel_context *ce)
	{
	struct i915_vma *vma = arg->scratch;
	struct i915_request *rq;
	u32 offset;
	u32 *vaddr;
	int err;

	memset32(arg->vaddr, STACK_MAGIC, PAGE_SIZE / sizeof(u32));

	rq = intel_context_create_request(ce);
	if (IS_ERR(rq))
	return PTR_ERR(rq);

	i915_vma_lock(vma);
	err = i915_request_await_object(rq, vma->obj, true);
	if (!err)
	err = i915_vma_move_to_active(vma, rq, EXEC_OBJECT_WRITE);
	i915_vma_unlock(vma);

	/* Read the mocs tables back using SRM */
	offset = i915_ggtt_offset(vma);
	if (!err)
	err = read_mocs_table(rq, &arg->mocs, &offset);
	if (!err && ce->engine->class == RENDER_CLASS)
	err = read_l3cc_table(rq, &arg->l3cc, &offset);
	offset -= i915_ggtt_offset(vma);
	GEM_BUG_ON(offset > PAGE_SIZE);

	err = request_add_sync(rq, err);
	if (err)
	return err;

	/* Compare the results against the expected tables */
	vaddr = arg->vaddr;
	if (!err)
	err = check_mocs_table(ce->engine, &arg->mocs, &vaddr);
	if (!err && ce->engine->class == RENDER_CLASS)
	err = check_l3cc_table(ce->engine, &arg->l3cc, &vaddr);
	if (err)
	return err;

	GEM_BUG_ON(arg->vaddr + offset != vaddr);
	return 0;
	}

	static int live_mocs_kernel(void *arg)
	{
	struct intel_gt *gt = arg;
	struct intel_engine_cs *engine;
	enum intel_engine_id id;
	struct live_mocs mocs;
	int err;

	/* Basic check the system is configured with the expected mocs table */

	err = live_mocs_init(&mocs, gt);
	if (err)
	return err;

	for_each_engine(engine, gt, id) {
	intel_engine_pm_get(engine);
	err = check_mocs_engine(&mocs, engine->kernel_context);
	intel_engine_pm_put(engine);
	if (err)
	break;
	}

	live_mocs_fini(&mocs);
	return err;
	}

	static int live_mocs_clean(void *arg)
	{
	struct intel_gt *gt = arg;
	struct intel_engine_cs *engine;
	enum intel_engine_id id;
	struct live_mocs mocs;
	int err;

	/* Every new context should see the same mocs table */

	err = live_mocs_init(&mocs, gt);
	if (err)
	return err;

	for_each_engine(engine, gt, id) {
	struct intel_context *ce;

	ce = mocs_context_create(engine);
	if (IS_ERR(ce)) {
	err = PTR_ERR(ce);
	break;
	}

	err = check_mocs_engine(&mocs, ce);
	intel_context_put(ce);
	if (err)
	break;
	}

	live_mocs_fini(&mocs);
	return err;
	}

	static int active_engine_reset(struct intel_context *ce,
	const char *reason)
	{
	struct igt_spinner spin;
	struct i915_request *rq;
	int err;

	err = igt_spinner_init(&spin, ce->engine->gt);
	if (err)
	return err;

	rq = igt_spinner_create_request(&spin, ce, MI_NOOP);
	if (IS_ERR(rq)) {
	igt_spinner_fini(&spin);
	return PTR_ERR(rq);
	}

	err = request_add_spin(rq, &spin);
	if (err == 0)
	err = intel_engine_reset(ce->engine, reason);

	igt_spinner_end(&spin);
	igt_spinner_fini(&spin);

	return err;
	}

	static int __live_mocs_reset(struct live_mocs *mocs,
	struct intel_context *ce)
	{
	int err;

	err = intel_engine_reset(ce->engine, "mocs");
	if (err)
	return err;

	err = check_mocs_engine(mocs, ce);
	if (err)
	return err;

	err = active_engine_reset(ce, "mocs");
	if (err)
	return err;

	err = check_mocs_engine(mocs, ce);
	if (err)
	return err;

	intel_gt_reset(ce->engine->gt, ce->engine->mask, "mocs");

	err = check_mocs_engine(mocs, ce);
	if (err)
	return err;

	return 0;
	}

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

	/* Check the mocs setup is retained over per-engine and global resets */

	if (!intel_has_reset_engine(gt))
	return 0;

	err = live_mocs_init(&mocs, gt);
	if (err)
	return err;

	igt_global_reset_lock(gt);
	for_each_engine(engine, gt, id) {
	struct intel_context *ce;

	ce = mocs_context_create(engine);
	if (IS_ERR(ce)) {
	err = PTR_ERR(ce);
	break;
	}

	intel_engine_pm_get(engine);
	err = __live_mocs_reset(&mocs, ce);
	intel_engine_pm_put(engine);

	intel_context_put(ce);
	if (err)
	break;
	}
	igt_global_reset_unlock(gt);

	live_mocs_fini(&mocs);
	return err;
	}

	int intel_mocs_live_selftests(struct drm_i915_private *i915)
	{
	static const struct i915_subtest tests[] = {
	SUBTEST(live_mocs_kernel),
	SUBTEST(live_mocs_clean),
	SUBTEST(live_mocs_reset),
	};
	struct drm_i915_mocs_table table;

	if (!get_mocs_settings(i915, &table))
	return 0;

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