/*
 * 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.
 *
 */

/** @file gem_mocs_settings.c
 *
 * Check that the MOCs cache settings are valid.
 */

#include "igt.h"
#include "igt_gt.h"
#include "igt_perf.h"
#include "igt_sysfs.h"

#define GEN9_NUM_MOCS_ENTRIES   62  /* 62 out of 64 - 63 & 64 are reserved. */
#define GEN11_NUM_MOCS_ENTRIES  64  /* 63-64 are reserved, but configured. */

enum {
	NONE,
	RESET,
	RC6,
	SUSPEND,
	HIBERNATE,
	MAX_MOCS_TEST_MODES
};

static const char * const test_modes[] = {
	[NONE] = "settings",
	[RESET] = "reset",
	[RC6] = "rc6",
	[SUSPEND] = "suspend",
	[HIBERNATE] = "hibernate"
};

#define MOCS_NON_DEFAULT_CTX	(1<<0)
#define MOCS_DIRTY_VALUES	(1<<1)
#define ALL_MOCS_FLAGS		(MOCS_NON_DEFAULT_CTX | \
				 MOCS_DIRTY_VALUES)

#define GEN9_LNCFCMOCS0		(0xB020)	/* L3 Cache Control base */
#define GEN9_GFX_MOCS_0		(0xc800)	/* Graphics MOCS base register*/
#define GEN9_MFX0_MOCS_0	(0xc900)	/* Media 0 MOCS base register*/
#define GEN9_MFX1_MOCS_0	(0xcA00)	/* Media 1 MOCS base register*/
#define GEN9_VEBOX_MOCS_0	(0xcB00)	/* Video MOCS base register*/
#define GEN9_BLT_MOCS_0		(0xcc00)	/* Blitter MOCS base register*/
#define ICELAKE_MOCS_PTE	{0x00000004, 0x0030, 0x1}
#define MOCS_PTE		{0x00000038, 0x0030, 0x1}

struct mocs_entry {
	uint32_t	control_value;
	uint16_t	l3cc_value;
	uint8_t 	used;
};

struct mocs_table {
	uint32_t		size;
	const struct mocs_entry	*table;
};

/* The first entries in the MOCS tables are defined by uABI */
static const struct mocs_entry icelake_mocs_table[GEN11_NUM_MOCS_ENTRIES] = {
	[0]  = { 0x00000005, 0x0010, 0x1},
	[1]  = ICELAKE_MOCS_PTE,
	[2]  = { 0x00000037, 0x0030, 0x1},
	[3]  = { 0x00000005, 0x0010, 0x1},
	[4]  = { 0x00000005, 0x0030, 0x1},
	[5]  = { 0x00000037, 0x0010, 0x1},
	[6]  = { 0x00000017, 0x0010, 0x1},
	[7]  = { 0x00000017, 0x0030, 0x1},
	[8]  = { 0x00000027, 0x0010, 0x1},
	[9]  = { 0x00000027, 0x0030, 0x1},
	[10] = { 0x00000077, 0x0010, 0x1},
	[11] = { 0x00000077, 0x0030, 0x1},
	[12] = { 0x00000057, 0x0010, 0x1},
	[13] = { 0x00000057, 0x0030, 0x1},
	[14] = { 0x00000067, 0x0010, 0x1},
	[15] = { 0x00000067, 0x0030, 0x1},
	[18] = { 0x00060037, 0x0030, 0x1},
	[19] = { 0x00000737, 0x0030, 0x1},
	[20] = { 0x00000337, 0x0030, 0x1},
	[21] = { 0x00000137, 0x0030, 0x1},
	[22] = { 0x000003b7, 0x0030, 0x1},
	[23] = { 0x000007b7, 0x0030, 0x1},
	[24 ... 61] = ICELAKE_MOCS_PTE,
	[62] = { 0x00000037, 0x0010, 0x1},
	[63] = { 0x00000037, 0x0010, 0x1},
};

static const struct mocs_entry skylake_mocs_table[GEN9_NUM_MOCS_ENTRIES] = {
	[0] = { 0x00000009, 0x0010, 0x1},
	[1] = MOCS_PTE,
	[2] = { 0x0000003b, 0x0030, 0x1},
	[3 ... GEN9_NUM_MOCS_ENTRIES - 1] = MOCS_PTE,
};

static const struct mocs_entry dirty_skylake_mocs_table[GEN9_NUM_MOCS_ENTRIES] = {
	[0 ... GEN9_NUM_MOCS_ENTRIES - 1] = { 0x00003FFF, 0x003F, 0x1 },
};

static const struct mocs_entry broxton_mocs_table[GEN9_NUM_MOCS_ENTRIES] = {
	[0] = { 0x00000009, 0x0010, 0x1},
	[1] = MOCS_PTE,
	[2] = { 0x00000039, 0x0030, 0x1},
	[3 ... GEN9_NUM_MOCS_ENTRIES - 1] = MOCS_PTE,
};

static const struct mocs_entry dirty_broxton_mocs_table[GEN9_NUM_MOCS_ENTRIES] = {
	[0 ... GEN9_NUM_MOCS_ENTRIES - 1] = { 0x00007FFF, 0x003F, 0x1 },
};

static const uint32_t write_values[GEN9_NUM_MOCS_ENTRIES] = {
	[0 ... GEN9_NUM_MOCS_ENTRIES - 1] = 0xFFFFFFFF,
};

static bool get_mocs_settings(int fd, struct mocs_table *table, bool dirty)
{
	uint32_t devid = intel_get_drm_devid(fd);
	bool result = false;

	if (IS_SKYLAKE(devid) || IS_KABYLAKE(devid)) {
		if (dirty) {
			table->size  = ARRAY_SIZE(dirty_skylake_mocs_table);
			table->table = dirty_skylake_mocs_table;
		} else {
			table->size  = ARRAY_SIZE(skylake_mocs_table);
			table->table = skylake_mocs_table;
		}
		result = true;
	} else if (IS_BROXTON(devid)) {
		if (dirty) {
			table->size  = ARRAY_SIZE(dirty_broxton_mocs_table);
			table->table = dirty_broxton_mocs_table;
		} else {
			table->size  = ARRAY_SIZE(broxton_mocs_table);
			table->table = broxton_mocs_table;
		}
		result = true;
	} else if (IS_ICELAKE(devid)) {
		table->size  = ARRAY_SIZE(icelake_mocs_table);
		table->table = icelake_mocs_table;
		result = true;
	}

	return result;
}

#define LOCAL_I915_EXEC_BSD1 (I915_EXEC_BSD | (1<<13))
#define LOCAL_I915_EXEC_BSD2 (I915_EXEC_BSD | (2<<13))

static uint32_t get_engine_base(uint32_t engine)
{
	switch (engine) {
	case LOCAL_I915_EXEC_BSD1:	return GEN9_MFX0_MOCS_0;
	case LOCAL_I915_EXEC_BSD2:	return GEN9_MFX1_MOCS_0;
	case I915_EXEC_RENDER:		return GEN9_GFX_MOCS_0;
	case I915_EXEC_BLT:		return GEN9_BLT_MOCS_0;
	case I915_EXEC_VEBOX:		return GEN9_VEBOX_MOCS_0;
	default:			return 0;
	}
}

#define MI_STORE_REGISTER_MEM_64_BIT_ADDR	((0x24 << 23) | 2)

static int create_read_batch(struct drm_i915_gem_relocation_entry *reloc,
			     uint32_t *batch,
			     uint32_t dst_handle,
			     uint32_t size,
			     uint32_t reg_base)
{
	unsigned int offset = 0;

	for (uint32_t index = 0; index < size; index++, offset += 4) {
		batch[offset]   = MI_STORE_REGISTER_MEM_64_BIT_ADDR;
		batch[offset+1] = reg_base + (index * sizeof(uint32_t));
		batch[offset+2] = index * sizeof(uint32_t);	/* reloc */
		batch[offset+3] = 0;

		reloc[index].offset = (offset + 2) * sizeof(uint32_t);
		reloc[index].delta = index * sizeof(uint32_t);
		reloc[index].target_handle = dst_handle;
		reloc[index].write_domain = I915_GEM_DOMAIN_RENDER;
		reloc[index].read_domains = I915_GEM_DOMAIN_RENDER;
	}

	batch[offset++] = MI_BATCH_BUFFER_END;
	batch[offset++] = 0;

	return offset * sizeof(uint32_t);
}

static void do_read_registers(int fd,
			      uint32_t ctx_id,
			      uint32_t dst_handle,
			      uint32_t reg_base,
			      uint32_t size,
			      uint32_t engine_id)
{
	struct drm_i915_gem_execbuffer2 execbuf;
	struct drm_i915_gem_exec_object2 obj[2];
	struct drm_i915_gem_relocation_entry reloc[size];
	uint32_t batch[size * 4 + 4];
	uint32_t handle = gem_create(fd, 4096);

	memset(reloc, 0, sizeof(reloc));
	memset(obj, 0, sizeof(obj));
	memset(&execbuf, 0, sizeof(execbuf));

	obj[0].handle = dst_handle;

	obj[1].handle = handle;
	obj[1].relocation_count = size;
	obj[1].relocs_ptr = to_user_pointer(reloc);

	execbuf.buffers_ptr = to_user_pointer(obj);
	execbuf.buffer_count = 2;
	execbuf.batch_len =
		create_read_batch(reloc, batch, dst_handle, size, reg_base);
	i915_execbuffer2_set_context_id(execbuf, ctx_id);
	execbuf.flags = I915_EXEC_SECURE | engine_id;

	gem_write(fd, handle, 0, batch, execbuf.batch_len);
	gem_execbuf(fd, &execbuf);
	gem_close(fd, handle);
}

#define LOCAL_MI_LOAD_REGISTER_IMM	(0x22 << 23)

static int create_write_batch(uint32_t *batch,
			      const uint32_t *values,
			      uint32_t size,
			      uint32_t reg_base)
{
	unsigned int i;
	unsigned int offset = 0;

	batch[offset++] = LOCAL_MI_LOAD_REGISTER_IMM | (size * 2 - 1);

	for (i = 0; i < size; i++) {
		batch[offset++] = reg_base + (i * 4);
		batch[offset++] = values[i];
	}

	batch[offset++] = MI_BATCH_BUFFER_END;

	return offset * sizeof(uint32_t);
}

static void write_registers(int fd,
			    uint32_t ctx_id,
			    uint32_t reg_base,
			    const uint32_t *values,
			    uint32_t size,
			    uint32_t engine_id,
			    bool privileged)
{
	struct drm_i915_gem_exec_object2 obj;
	struct drm_i915_gem_execbuffer2 execbuf;
	uint32_t batch[size * 4 + 2];
	uint32_t handle = gem_create(fd, 4096);

	memset(&obj, 0, sizeof(obj));
	memset(&execbuf, 0, sizeof(execbuf));

	obj.handle = handle;

	execbuf.buffers_ptr = to_user_pointer(&obj);
	execbuf.buffer_count = 1;
	execbuf.batch_len = create_write_batch(batch, values, size, reg_base);
	i915_execbuffer2_set_context_id(execbuf, ctx_id);
	if (privileged)
		execbuf.flags = I915_EXEC_SECURE | engine_id;
	else
		execbuf.flags = engine_id;

	gem_write(fd, handle, 0, batch, execbuf.batch_len);
	gem_execbuf(fd, &execbuf);
	gem_close(fd, handle);
}

static void check_control_registers(int fd,
				    unsigned engine,
				    uint32_t ctx_id,
				    bool dirty)
{
	const uint32_t reg_base = get_engine_base(engine);
	uint32_t dst_handle = gem_create(fd, 4096);
	uint32_t *read_regs;
	struct mocs_table table;

	igt_assert(get_mocs_settings(fd, &table, dirty));

	do_read_registers(fd,
			  ctx_id,
			  dst_handle,
			  reg_base,
			  table.size,
			  engine);

	read_regs = gem_mmap__cpu(fd, dst_handle, 0, 4096, PROT_READ);

	gem_set_domain(fd, dst_handle, I915_GEM_DOMAIN_CPU, 0);
	for (int index = 0; index < table.size; index++) {
		if (!table.table[index].used)
			continue;
		igt_assert_eq_u32(read_regs[index],
				  table.table[index].control_value);
	}

	munmap(read_regs, 4096);
	gem_close(fd, dst_handle);
}

static void check_l3cc_registers(int fd,
				 unsigned engine,
				 uint32_t ctx_id,
				 bool dirty)
{
	struct mocs_table table;
	uint32_t dst_handle = gem_create(fd, 4096);
	uint32_t *read_regs;
	int index;

	igt_assert(get_mocs_settings(fd, &table, dirty));

	do_read_registers(fd,
			  ctx_id,
			  dst_handle,
			  GEN9_LNCFCMOCS0,
			  (table.size + 1) / 2,
			  engine);

	read_regs = gem_mmap__cpu(fd, dst_handle, 0, 4096, PROT_READ);

	gem_set_domain(fd, dst_handle, I915_GEM_DOMAIN_CPU, 0);

	for (index = 0; index < table.size / 2; index++) {
		if (table.table[index * 2].used) {
			igt_assert_eq_u32(read_regs[index] & 0xffff,
					  table.table[index * 2].l3cc_value);
		}
		if (table.table[index * 2 + 1].used) {
			igt_assert_eq_u32(read_regs[index] >> 16,
					  table.table[index * 2 + 1].l3cc_value);
		}
	}

	if (table.size & 1)
		igt_assert_eq_u32(read_regs[index] & 0xffff,
				  table.table[index * 2].l3cc_value);

	munmap(read_regs, 4096);
	gem_close(fd, dst_handle);
}

static void rc6_wait(int i915)
{
	uint64_t start[2], now[2], prev;
	bool rc6 = false;
	int fd;

	fd = perf_i915_open(I915_PMU_RC6_RESIDENCY);
	igt_require(fd != -1);

	/* First wait for roughly an RC6 Evaluation Interval */
	gem_quiescent_gpu(i915);
	usleep(320e3);

	/* Then poll for RC6 to start ticking */
	igt_assert_eq(read(fd, start, sizeof(start)), sizeof(start));
	prev = start[1];
	do {
		usleep(5e3);
		igt_assert_eq(read(fd, now, sizeof(now)), sizeof(now));
		if (now[1] - prev > 1e6) {
			rc6 = true;
			break;
		}
		prev = now[1];
	} while (now[0] - start[0] < 1e9);

	close(fd);

	igt_debug("rc6 residency %.2fms (delta %.1fms over 5ms), elapsed %.2fms\n",
		  1e-6 * (now[1] - start[1]),
		  1e-6 * (now[1] - prev),
		  1e-6 * (now[0] - start[0]));
	igt_require(rc6);
}

static void check_mocs_values(int fd,
			      unsigned engine, uint32_t ctx_id,
			      bool dirty)
{
	check_control_registers(fd, engine, ctx_id, dirty);

	if (engine == I915_EXEC_RENDER)
		check_l3cc_registers(fd, engine, ctx_id, dirty);
}

static void write_dirty_mocs(int fd,
			     unsigned engine, uint32_t ctx_id,
			     bool privileged)
{
	int num_of_mocs_entries;

	if (intel_gen(intel_get_drm_devid(fd)) >= 11)
		num_of_mocs_entries = GEN11_NUM_MOCS_ENTRIES;
	else
		num_of_mocs_entries = GEN9_NUM_MOCS_ENTRIES;

	write_registers(fd, ctx_id, get_engine_base(engine),
			write_values, num_of_mocs_entries,
			engine, privileged);

	if (engine == I915_EXEC_RENDER)
		write_registers(fd, ctx_id, GEN9_LNCFCMOCS0,
				write_values, num_of_mocs_entries/2,
				engine, privileged);
}

static void run_test(int fd, unsigned engine, unsigned flags, unsigned mode)
{
	uint32_t ctx_id = 0;
	uint32_t ctx_clean_id;
	uint32_t ctx_dirty_id;

	/* As mocs is global for GEN11+, trying privileged write to dirty
	 * the mocs and testing context save and restore of mocs between
	 * contexts is bound to fail.
	 */
	if (flags & MOCS_DIRTY_VALUES)
		igt_skip_on(intel_gen(intel_get_drm_devid(fd)) >= 11);

	gem_require_ring(fd, engine);

	/* Skip if we don't know where the registers are for this engine */
	igt_require(get_engine_base(engine));

	if (flags & MOCS_NON_DEFAULT_CTX)
		ctx_id = gem_context_create(fd);

	if (flags & MOCS_DIRTY_VALUES) {
		ctx_dirty_id = gem_context_create(fd);
		write_dirty_mocs(fd, engine, ctx_dirty_id, true);
		check_mocs_values(fd, engine, ctx_dirty_id, true);
	}

	check_mocs_values(fd, engine, ctx_id, false);

	switch (mode) {
	case NONE:	break;
	case RESET:	igt_force_gpu_reset(fd);	break;
	case SUSPEND:	igt_system_suspend_autoresume(SUSPEND_STATE_MEM,
						      SUSPEND_TEST_NONE); break;
	case HIBERNATE:	igt_system_suspend_autoresume(SUSPEND_STATE_DISK,
						      SUSPEND_TEST_NONE); break;
	case RC6:	rc6_wait(fd);			break;
	}

	check_mocs_values(fd, engine, ctx_id, false);

	if (flags & MOCS_DIRTY_VALUES) {
		ctx_clean_id = gem_context_create(fd);
		check_mocs_values(fd, engine, ctx_dirty_id, true);
		check_mocs_values(fd, engine, ctx_clean_id, false);
		gem_context_destroy(fd, ctx_dirty_id);
		gem_context_destroy(fd, ctx_clean_id);
	}

	if (ctx_id)
		gem_context_destroy(fd, ctx_id);
}

static void isolation_test(int fd, unsigned engine)
{
	uint32_t ctx[2] = { gem_context_create(fd), gem_context_create(fd) };

	/* Any writes by one normal client should not affect a second client */
	write_dirty_mocs(fd, engine, ctx[0], false);
	check_mocs_values(fd, engine, ctx[1], false);

	for (int i = 0; i < ARRAY_SIZE(ctx); i++)
		gem_context_destroy(fd, ctx[i]);
}

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

	igt_fixture {
		fd = drm_open_driver_master(DRIVER_INTEL); /* for SECURE */
		igt_require_gem(fd);
		gem_require_mocs_registers(fd);
		igt_require(get_mocs_settings(fd, &table, false));
	}

	for (e = intel_execution_engines; e->name; e++) {
		/* We don't know which engine will be assigned to us if we're
		 * using plain I915_EXEC_BSD, I915_EXEC_DEFAULT is just
		 * duplicating render
		 */
		if ((e->exec_id == I915_EXEC_BSD && !e->flags) ||
		    e->exec_id == I915_EXEC_DEFAULT)
			continue;

		for (unsigned mode = NONE; mode < MAX_MOCS_TEST_MODES; mode++) {
			igt_subtest_group {
				igt_hang_t hang = {};

				igt_fixture {
					if (mode == RESET)
						hang = igt_allow_hang(fd, 0, 0);
				}

				for (unsigned flags = 0; flags < ALL_MOCS_FLAGS + 1; flags++) {
					/* Trying to test non-render engines for dirtying MOCS
					 * values from one context having effect on different
					 * context is bound to fail - only render engine is
					 * doing context save/restore of MOCS registers.
					 * Let's also limit testing values on non-default
					 * contexts to render-only.
					 */
					if (flags && e->exec_id != I915_EXEC_RENDER)
						continue;

					igt_subtest_f("mocs-%s%s%s-%s",
						      test_modes[mode],
						      flags & MOCS_NON_DEFAULT_CTX ? "-ctx": "",
						      flags & MOCS_DIRTY_VALUES ? "-dirty" : "",
						      e->name) {
						if (flags & (MOCS_NON_DEFAULT_CTX | MOCS_DIRTY_VALUES))
							gem_require_contexts(fd);

						run_test(fd, e->exec_id | e->flags, flags, mode);
					}
				}

				igt_fixture {
					if (mode == RESET)
						igt_disallow_hang(fd, hang);
				}
			}
		}

		igt_subtest_f("mocs-isolation-%s",
			      e->name) {
			gem_require_contexts(fd);

			isolation_test(fd, e->exec_id | e->flags);
		}
	}

	igt_fixture
		close(fd);
}