ntel-gpu-tools/tests/gem_busy.c

/*
 * Copyright © 2016 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#include "igt.h"

#define LOCAL_EXEC_NO_RELOC (1<<11)

/* Exercise the busy-ioctl, ensuring the ABI is never broken */
IGT_TEST_DESCRIPTION("Basic check of busy-ioctl ABI.");

enum { TEST = 0, BUSY, BATCH };

static bool gem_busy(int fd, uint32_t handle)
{
	struct drm_i915_gem_busy busy;

	memset(&busy, 0, sizeof(busy));
	busy.handle = handle;

	do_ioctl(fd, DRM_IOCTL_I915_GEM_BUSY, &busy);

	return busy.busy != 0;
}

static void __gem_busy(int fd,
		       uint32_t handle,
		       uint32_t *read,
		       uint32_t *write)
{
	struct drm_i915_gem_busy busy;

	memset(&busy, 0, sizeof(busy));
	busy.handle = handle;

	do_ioctl(fd, DRM_IOCTL_I915_GEM_BUSY, &busy);

	*write = busy.busy & 0xffff;
	*read = busy.busy >> 16;
}

static uint32_t busy_blt(int fd)
{
	const int gen = intel_gen(intel_get_drm_devid(fd));
	const int has_64bit_reloc = gen >= 8;
	struct drm_i915_gem_execbuffer2 execbuf;
	struct drm_i915_gem_exec_object2 object[2];
	struct drm_i915_gem_relocation_entry reloc[200], *r;
	uint32_t read, write;
	uint32_t *map;
	int factor = 100;
	int i = 0;

	memset(object, 0, sizeof(object));
	object[0].handle = gem_create(fd, 1024*1024);
	object[1].handle = gem_create(fd, 4096);

	r = memset(reloc, 0, sizeof(reloc));
	map = gem_mmap__cpu(fd, object[1].handle, 0, 4096, PROT_WRITE);
	gem_set_domain(fd, object[1].handle,
		       I915_GEM_DOMAIN_CPU, I915_GEM_DOMAIN_CPU);

#define COPY_BLT_CMD		(2<<29|0x53<<22|0x6)
#define BLT_WRITE_ALPHA		(1<<21)
#define BLT_WRITE_RGB		(1<<20)
	while (factor--) {
		/* XY_SRC_COPY */
		map[i++] = COPY_BLT_CMD | BLT_WRITE_ALPHA | BLT_WRITE_RGB;
		if (has_64bit_reloc)
			map[i-1] += 2;
		map[i++] = 0xcc << 16 | 1 << 25 | 1 << 24 | (4*1024);
		map[i++] = 0;
		map[i++] = 256 << 16 | 1024;

		r->offset = i * sizeof(uint32_t);
		r->target_handle = object[0].handle;
		r->read_domains = I915_GEM_DOMAIN_RENDER;
		r->write_domain = I915_GEM_DOMAIN_RENDER;
		r++;
		map[i++] = 0;
		if (has_64bit_reloc)
			map[i++] = 0;

		map[i++] = 0;
		map[i++] = 4096;

		r->offset = i * sizeof(uint32_t);
		r->target_handle = object[0].handle;
		r->read_domains = I915_GEM_DOMAIN_RENDER;
		r->write_domain = 0;
		r++;
		map[i++] = 0;
		if (has_64bit_reloc)
			map[i++] = 0;
	}
	map[i++] = MI_BATCH_BUFFER_END;
	igt_assert(i <= 4096/sizeof(uint32_t));
	igt_assert(r - reloc <= ARRAY_SIZE(reloc));
	munmap(map, 4096);

	object[1].relocs_ptr = (uintptr_t)reloc;
	object[1].relocation_count = r - reloc;

	memset(&execbuf, 0, sizeof(execbuf));
	execbuf.buffers_ptr = (unsigned long)object;
	execbuf.buffer_count = 2;
	if (gen >= 6)
		execbuf.flags = I915_EXEC_BLT;
	gem_execbuf(fd, &execbuf);

	__gem_busy(fd, object[0].handle, &read, &write);
	igt_assert_eq(read, 1 << write);
	igt_assert_eq(write, gen >= 6 ? I915_EXEC_BLT : I915_EXEC_RENDER);

	igt_debug("Created busy handle %d\n", object[0].handle);
	gem_close(fd, object[1].handle);
	return object[0].handle;
}

static bool exec_noop(int fd,
		      uint32_t *handles,
		      unsigned ring,
		      bool write)
{
	struct drm_i915_gem_execbuffer2 execbuf;
	struct drm_i915_gem_exec_object2 exec[3];

	memset(exec, 0, sizeof(exec));
	exec[0].handle = handles[BUSY];
	exec[1].handle = handles[TEST];
	if (write)
		exec[1].flags |= EXEC_OBJECT_WRITE;
	exec[2].handle = handles[BATCH];

	memset(&execbuf, 0, sizeof(execbuf));
	execbuf.buffers_ptr = (uintptr_t)exec;
	execbuf.buffer_count = 3;
	execbuf.flags = ring;
	igt_debug("Queuing handle for %s on ring %d\n",
		  write ? "writing" : "reading", ring & 0x7);
	return __gem_execbuf(fd, &execbuf) == 0;
}

static bool still_busy(int fd, uint32_t handle)
{
	uint32_t read, write;
	__gem_busy(fd, handle, &read, &write);
	return write;
}

static void semaphore(int fd, unsigned ring, uint32_t flags)
{
	uint32_t bbe = MI_BATCH_BUFFER_END;
	uint32_t handle[3];
	uint32_t read, write;
	uint32_t active;
	unsigned i;

	gem_require_ring(fd, ring | flags);

	handle[TEST] = gem_create(fd, 4096);
	handle[BATCH] = gem_create(fd, 4096);
	gem_write(fd, handle[BATCH], 0, &bbe, sizeof(bbe));

	/* Create a long running batch which we can use to hog the GPU */
	handle[BUSY] = busy_blt(fd);

	/* Queue a batch after the busy, it should block and remain "busy" */
	igt_assert(exec_noop(fd, handle, ring | flags, false));
	igt_assert(still_busy(fd, handle[BUSY]));
	__gem_busy(fd, handle[TEST], &read, &write);
	igt_assert_eq(read, 1 << ring);
	igt_assert_eq(write, 0);

	/* Requeue with a write */
	igt_assert(exec_noop(fd, handle, ring | flags, true));
	igt_assert(still_busy(fd, handle[BUSY]));
	__gem_busy(fd, handle[TEST], &read, &write);
	igt_assert_eq(read, 1 << ring);
	igt_assert_eq(write, ring);

	/* Now queue it for a read across all available rings */
	active = 0;
	for (i = I915_EXEC_RENDER; i <= I915_EXEC_VEBOX; i++) {
		if (exec_noop(fd, handle, i | flags, false))
			active |= 1 << i;
	}
	igt_assert(still_busy(fd, handle[BUSY]));
	__gem_busy(fd, handle[TEST], &read, &write);
	igt_assert_eq(read, active);
	igt_assert_eq(write, ring); /* from the earlier write */

	/* Check that our long batch was long enough */
	igt_assert(still_busy(fd, handle[BUSY]));

	/* And make sure it becomes idle again */
	gem_sync(fd, handle[TEST]);
	__gem_busy(fd, handle[TEST], &read, &write);
	igt_assert_eq(read, 0);
	igt_assert_eq(write, 0);

	for (i = TEST; i <= BATCH; i++)
		gem_close(fd, handle[i]);
}

static void create_indirect(int fd,
			    struct drm_i915_gem_exec_object2 *obj,
			    struct drm_i915_gem_exec_object2 *target)
{
	const int gen = intel_gen(intel_get_drm_devid(fd));
	const int nreloc = 128;
	struct drm_i915_gem_relocation_entry *reloc;
	uint32_t *batch;
	int i, count;

	reloc = calloc(nreloc, sizeof(*reloc));

	obj->handle = gem_create(fd, 4096);
	obj->relocs_ptr = (uintptr_t)reloc;
	obj->relocation_count = nreloc;

	batch = gem_mmap__cpu(fd, obj->handle, 0, 4096, PROT_WRITE);
	gem_set_domain(fd, obj->handle,
			I915_GEM_DOMAIN_CPU, I915_GEM_DOMAIN_CPU);

	i = 0;
	for (count = 0; count < nreloc; count++) {
		reloc[count].target_handle = target->handle;
		reloc[count].presumed_offset = target->offset;
		reloc[count].offset = sizeof(uint32_t) * (i + 1);
		reloc[count].delta = 0;
		reloc[count].read_domains = I915_GEM_DOMAIN_COMMAND;
		reloc[count].write_domain = 0;
		batch[i] = MI_BATCH_BUFFER_START;
		if (gen >= 8) {
			batch[i] |= 1 << 8 | 1;
			batch[++i] = target->offset;
			batch[++i] = target->offset >> 32;
		} else if (gen >= 6) {
			batch[i] |= 1 << 8;
			batch[++i] = target->offset;
		} else {
			batch[i] |= 2 << 6;
			batch[++i] = target->offset;
			if (gen < 4) {
				batch[i] |= 1;
				reloc[count].delta = 1;
			}
		}
		i++;
	}
	batch[++i] = MI_BATCH_BUFFER_END;
	igt_assert(i < 4096/sizeof(*batch));
	munmap(batch, 4096);
}

static void store(int fd, unsigned ring, uint32_t flags)
{
	const int gen = intel_gen(intel_get_drm_devid(fd));
	struct drm_i915_gem_exec_object2 obj[16];
	struct drm_i915_gem_relocation_entry store[1024];
	struct drm_i915_gem_execbuffer2 execbuf;
	unsigned size = ALIGN(ARRAY_SIZE(store)*16 + 4, 4096);
	uint32_t read[2], write[2];
	struct timespec tv;
	uint32_t *batch;
	int i, count, idx;

	gem_require_ring(fd, ring | flags);
	igt_skip_on_f(gen == 6 && (ring & ~(3<<13)) == I915_EXEC_BSD,
		      "MI_STORE_DATA broken on gen6 bsd\n");

	gem_quiescent_gpu(fd);

	memset(&execbuf, 0, sizeof(execbuf));
	execbuf.buffers_ptr = (uintptr_t)obj;
	execbuf.buffer_count = 2;
	execbuf.flags = ring | flags | LOCAL_EXEC_NO_RELOC;
	if (gen < 6)
		execbuf.flags |= I915_EXEC_SECURE;

	memset(obj, 0, sizeof(obj));
	obj[0].handle = gem_create(fd, 4096);
	obj[0].flags = EXEC_OBJECT_WRITE;
	obj[1].handle = gem_create(fd, size);

	memset(store, 0, sizeof(store));
	obj[1].relocs_ptr = (uintptr_t)store;
	obj[1].relocation_count = ARRAY_SIZE(store);

	batch = gem_mmap__cpu(fd, obj[1].handle, 0, size, PROT_WRITE);
	gem_set_domain(fd, obj[1].handle,
			I915_GEM_DOMAIN_CPU, I915_GEM_DOMAIN_CPU);

	i = 0;
	for (count = 0; count < ARRAY_SIZE(store); count++) {
		store[count].target_handle = obj[0].handle;
		store[count].presumed_offset = -1;
		store[count].offset = sizeof(uint32_t) * (i + 1);
		store[count].delta = sizeof(uint32_t) * count;
		store[count].read_domains = I915_GEM_DOMAIN_INSTRUCTION;
		store[count].write_domain = I915_GEM_DOMAIN_INSTRUCTION;
		batch[i] = MI_STORE_DWORD_IMM | (gen < 6 ? 1 << 22 : 0);
		if (gen >= 8) {
			batch[++i] = 0;
			batch[++i] = 0;
		} else if (gen >= 4) {
			batch[++i] = 0;
			batch[++i] = 0;
			store[count].offset += sizeof(uint32_t);
		} else {
			batch[i]--;
			batch[++i] = 0;
		}
		batch[++i] = count;
		i++;
	}
	batch[++i] = MI_BATCH_BUFFER_END;
	igt_assert(i < size/sizeof(*batch));
	munmap(batch, size);
	igt_require(__gem_execbuf(fd, &execbuf) == 0);

	do {
		idx = execbuf.buffer_count++;
		igt_require(idx < ARRAY_SIZE(obj));
		create_indirect(fd, &obj[idx], &obj[idx-1]);
		igt_require(__gem_execbuf(fd, &execbuf) == 0);

		gem_execbuf(fd, &execbuf);
		__gem_busy(fd, obj[0].handle, &read[0], &write[0]);
		__gem_busy(fd, obj[idx].handle, &read[1], &write[1]);
		igt_debug("After %d cycles: read[0]=%x read[1]=%x\n",
			  idx-1, read[0], read[1]);
	} while (read[0] == 0 || read[1] == 0);

	igt_assert_eq(write[0], ring);
	igt_assert_eq_u32(read[0], 1 << ring);

	igt_assert_eq(write[1], 0);
	igt_assert_eq_u32(read[1], 1 << ring);

	/* Calling busy in a loop should be enough to flush the rendering */
	memset(&tv, 0, sizeof(tv));
	while (gem_busy(fd, obj[idx].handle))
		igt_assert(igt_seconds_elapsed(&tv) < 10);
	igt_assert(!gem_busy(fd, obj[0].handle));

	batch = gem_mmap__gtt(fd, obj[0].handle, 4096, PROT_READ);
	for (i = 0; i < 1024; i++)
		igt_assert_eq_u32(batch[i], i);
	munmap(batch, 4096);

	for (i = 0; i <= idx; i++) {
		struct drm_i915_gem_relocation_entry *r;

		r = (struct drm_i915_gem_relocation_entry *)
			(uintptr_t)obj[i].relocs_ptr;
		if (r != store)
			free(r);
		gem_close(fd, obj[i].handle);
	}
}

static bool has_semaphores(int fd)
{
	struct drm_i915_getparam gp;
	int val = -1;

	memset(&gp, 0, sizeof(gp));
	gp.param = I915_PARAM_HAS_SEMAPHORES;
	gp.value = &val;

	drmIoctl(fd, DRM_IOCTL_I915_GETPARAM, &gp);
	errno = 0;

	return val > 0;
}

igt_main
{
	const struct intel_execution_engine *e;
	int fd = -1;

	igt_skip_on_simulation();

	igt_fixture
		fd = drm_open_driver_master(DRIVER_INTEL);

	igt_subtest_group {
		for (e = intel_execution_engines; e->name; e++) {
			/* default exec-id is purely symbolic */
			if (e->exec_id == 0)
				continue;

			igt_subtest_f("basic-%s", e->name)
				store(fd, e->exec_id, e->flags);
		}
	}

	igt_subtest_group {
		igt_fixture
			igt_require(has_semaphores(fd));

		for (e = intel_execution_engines; e->name; e++) {
			/* default exec-id is purely symbolic */
			if (e->exec_id == 0)
				continue;

			igt_subtest_f("semaphore-%s", e->name)
				semaphore(fd, e->exec_id, e->flags);
		}
	}

	igt_fixture
		close(fd);
}