path: root/lib/gpgpu_fill.c

/*
 * Copyright © 2015 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.
 *
 * Authors:
 *  Zhenyu Wang <zhenyuw@linux.intel.com>
 *  Dominik Zeromski <dominik.zeromski@intel.com>
 */

#include <intel_bufmgr.h>
#include <i915_drm.h>

#include "intel_reg.h"
#include "drmtest.h"
#include "intel_batchbuffer.h"
#include "gen7_media.h"
#include "gpgpu_fill.h"

/* shaders/gpgpu/gpgpu_fill.gxa */
static const uint32_t gen7_gpgpu_kernel[][4] = {
	{ 0x00400001, 0x20200231, 0x00000020, 0x00000000 },
	{ 0x00000041, 0x20400c21, 0x00000004, 0x00000010 },
	{ 0x00000001, 0x20440021, 0x00000018, 0x00000000 },
	{ 0x00600001, 0x20800021, 0x008d0000, 0x00000000 },
	{ 0x00200001, 0x20800021, 0x00450040, 0x00000000 },
	{ 0x00000001, 0x20880061, 0x00000000, 0x0000000f },
	{ 0x00800001, 0x20a00021, 0x00000020, 0x00000000 },
	{ 0x05800031, 0x24001ca8, 0x00000080, 0x060a8000 },
	{ 0x00600001, 0x2e000021, 0x008d0000, 0x00000000 },
	{ 0x07800031, 0x20001ca8, 0x00000e00, 0x82000010 },
};

static uint32_t
batch_used(struct intel_batchbuffer *batch)
{
	return batch->ptr - batch->buffer;
}

static uint32_t
batch_align(struct intel_batchbuffer *batch, uint32_t align)
{
	uint32_t offset = batch_used(batch);
	offset = ALIGN(offset, align);
	batch->ptr = batch->buffer + offset;
	return offset;
}

static void *
batch_alloc(struct intel_batchbuffer *batch, uint32_t size, uint32_t align)
{
	uint32_t offset = batch_align(batch, align);
	batch->ptr += size;
	return memset(batch->buffer + offset, 0, size);
}

static uint32_t
batch_offset(struct intel_batchbuffer *batch, void *ptr)
{
	return (uint8_t *)ptr - batch->buffer;
}

static uint32_t
batch_copy(struct intel_batchbuffer *batch, const void *ptr, uint32_t size,
	   uint32_t align)
{
	return batch_offset(batch, memcpy(batch_alloc(batch, size, align), ptr, size));
}

static void
gen7_render_flush(struct intel_batchbuffer *batch, uint32_t batch_end)
{
	int ret;

	ret = drm_intel_bo_subdata(batch->bo, 0, 4096, batch->buffer);
	if (ret == 0)
		ret = drm_intel_bo_mrb_exec(batch->bo, batch_end,
					NULL, 0, 0, 0);
	igt_assert(ret == 0);
}

static uint32_t
gen7_fill_curbe_buffer_data(struct intel_batchbuffer *batch,
			uint8_t color)
{
	uint8_t *curbe_buffer;
	uint32_t offset;

	curbe_buffer = batch_alloc(batch, sizeof(uint32_t) * 8, 64);
	offset = batch_offset(batch, curbe_buffer);
	*curbe_buffer = color;

	return offset;
}

static uint32_t
gen7_fill_surface_state(struct intel_batchbuffer *batch,
			struct igt_buf *buf,
			uint32_t format,
			int is_dst)
{
	struct gen7_surface_state *ss;
	uint32_t write_domain, read_domain, offset;
	int ret;

	if (is_dst) {
		write_domain = read_domain = I915_GEM_DOMAIN_RENDER;
	} else {
		write_domain = 0;
		read_domain = I915_GEM_DOMAIN_SAMPLER;
	}

	ss = batch_alloc(batch, sizeof(*ss), 64);
	offset = batch_offset(batch, ss);

	ss->ss0.surface_type = GEN7_SURFACE_2D;
	ss->ss0.surface_format = format;
	ss->ss0.render_cache_read_write = 1;

	if (buf->tiling == I915_TILING_X)
		ss->ss0.tiled_mode = 2;
	else if (buf->tiling == I915_TILING_Y)
		ss->ss0.tiled_mode = 3;

	ss->ss1.base_addr = buf->bo->offset;
	ret = drm_intel_bo_emit_reloc(batch->bo,
				batch_offset(batch, ss) + 4,
				buf->bo, 0,
				read_domain, write_domain);
	igt_assert(ret == 0);

	ss->ss2.height = igt_buf_height(buf) - 1;
	ss->ss2.width  = igt_buf_width(buf) - 1;

	ss->ss3.pitch  = buf->stride - 1;

	ss->ss7.shader_chanel_select_r = 4;
	ss->ss7.shader_chanel_select_g = 5;
	ss->ss7.shader_chanel_select_b = 6;
	ss->ss7.shader_chanel_select_a = 7;

	return offset;
}

static uint32_t
gen7_fill_binding_table(struct intel_batchbuffer *batch,
			struct igt_buf *dst)
{
	uint32_t *binding_table, offset;

	binding_table = batch_alloc(batch, 32, 64);
	offset = batch_offset(batch, binding_table);

	binding_table[0] = gen7_fill_surface_state(batch, dst, GEN7_SURFACEFORMAT_R8_UNORM, 1);

	return offset;
}

static uint32_t
gen7_fill_gpgpu_kernel(struct intel_batchbuffer *batch,
		const uint32_t kernel[][4],
		size_t size)
{
	uint32_t offset;

	offset = batch_copy(batch, kernel, size, 64);

	return offset;
}

static uint32_t
gen7_fill_interface_descriptor(struct intel_batchbuffer *batch, struct igt_buf *dst,
			       const uint32_t kernel[][4], size_t size)
{
	struct gen7_interface_descriptor_data *idd;
	uint32_t offset;
	uint32_t binding_table_offset, kernel_offset;

	binding_table_offset = gen7_fill_binding_table(batch, dst);
	kernel_offset = gen7_fill_gpgpu_kernel(batch, kernel, size);

	idd = batch_alloc(batch, sizeof(*idd), 64);
	offset = batch_offset(batch, idd);

	idd->desc0.kernel_start_pointer = (kernel_offset >> 6);

	idd->desc1.single_program_flow = 1;
	idd->desc1.floating_point_mode = GEN7_FLOATING_POINT_IEEE_754;

	idd->desc2.sampler_count = 0;      /* 0 samplers used */
	idd->desc2.sampler_state_pointer = 0;

	idd->desc3.binding_table_entry_count = 0;
	idd->desc3.binding_table_pointer = (binding_table_offset >> 5);

	idd->desc4.constant_urb_entry_read_offset = 0;
	idd->desc4.constant_urb_entry_read_length = 1; /* grf 1 */

	return offset;
}

static void
gen7_emit_state_base_address(struct intel_batchbuffer *batch)
{
	OUT_BATCH(GEN7_STATE_BASE_ADDRESS | (10 - 2));

	/* general */
	OUT_BATCH(0);

	/* surface */
	OUT_RELOC(batch->bo, I915_GEM_DOMAIN_INSTRUCTION, 0, BASE_ADDRESS_MODIFY);

	/* dynamic */
	OUT_RELOC(batch->bo, I915_GEM_DOMAIN_INSTRUCTION, 0, BASE_ADDRESS_MODIFY);

	/* indirect */
	OUT_BATCH(0);

	/* instruction */
	OUT_RELOC(batch->bo, I915_GEM_DOMAIN_INSTRUCTION, 0, BASE_ADDRESS_MODIFY);

	/* general/dynamic/indirect/instruction access Bound */
	OUT_BATCH(0);
	OUT_BATCH(0 | BASE_ADDRESS_MODIFY);
	OUT_BATCH(0);
	OUT_BATCH(0 | BASE_ADDRESS_MODIFY);
}

static void
gen7_emit_vfe_state_gpgpu(struct intel_batchbuffer *batch)
{
	OUT_BATCH(GEN7_MEDIA_VFE_STATE | (8 - 2));

	/* scratch buffer */
	OUT_BATCH(0);

	/* number of threads & urb entries */
	OUT_BATCH(1 << 16 | /* max num of threads */
		  0 << 8 | /* num of URB entry */
		  1 << 2); /* GPGPU mode */

	OUT_BATCH(0);

	/* urb entry size & curbe size */
	OUT_BATCH(0 << 16 | 	/* URB entry size in 256 bits unit */
		  1);		/* CURBE entry size in 256 bits unit */

	/* scoreboard */
	OUT_BATCH(0);
	OUT_BATCH(0);
	OUT_BATCH(0);
}

static void
gen7_emit_curbe_load(struct intel_batchbuffer *batch, uint32_t curbe_buffer)
{
	OUT_BATCH(GEN7_MEDIA_CURBE_LOAD | (4 - 2));
	OUT_BATCH(0);
	/* curbe total data length */
	OUT_BATCH(64);
	/* curbe data start address, is relative to the dynamics base address */
	OUT_BATCH(curbe_buffer);
}

static void
gen7_emit_interface_descriptor_load(struct intel_batchbuffer *batch, uint32_t interface_descriptor)
{
	OUT_BATCH(GEN7_MEDIA_INTERFACE_DESCRIPTOR_LOAD | (4 - 2));
	OUT_BATCH(0);
	/* interface descriptor data length */
	OUT_BATCH(sizeof(struct gen7_interface_descriptor_data));
	/* interface descriptor address, is relative to the dynamics base address */
	OUT_BATCH(interface_descriptor);
}

static void
gen7_emit_gpgpu_walk(struct intel_batchbuffer *batch,
		     unsigned x, unsigned y,
		     unsigned width, unsigned height)
{
	uint32_t x_dim, y_dim, tmp, right_mask;

	/*
	 * Simply do SIMD16 based dispatch, so every thread uses
	 * SIMD16 channels.
	 *
	 * Define our own thread group size, e.g 16x1 for every group, then
	 * will have 1 thread each group in SIMD16 dispatch. So thread
	 * width/height/depth are all 1.
	 *
	 * Then thread group X = width / 16 (aligned to 16)
	 * thread group Y = height;
	 */
	x_dim = (width + 15) / 16;
	y_dim = height;

	tmp = width & 15;
	if (tmp == 0)
		right_mask = (1 << 16) - 1;
	else
		right_mask = (1 << tmp) - 1;

	OUT_BATCH(GEN7_GPGPU_WALKER | 9);

	/* interface descriptor offset */
	OUT_BATCH(0);

	/* SIMD size, thread w/h/d */
	OUT_BATCH(1 << 30 | /* SIMD16 */
		  0 << 16 | /* depth:1 */
		  0 << 8 | /* height:1 */
		  0); /* width:1 */

	/* thread group X */
	OUT_BATCH(0);
	OUT_BATCH(x_dim);

	/* thread group Y */
	OUT_BATCH(0);
	OUT_BATCH(y_dim);

	/* thread group Z */
	OUT_BATCH(0);
	OUT_BATCH(1);

	/* right mask */
	OUT_BATCH(right_mask);

	/* bottom mask, height 1, always 0xffffffff */
	OUT_BATCH(0xffffffff);
}

/*
 * This sets up the gpgpu pipeline,
 *
 * +---------------+ <---- 4096
 * |       ^       |
 * |       |       |
 * |    various    |
 * |      state    |
 * |       |       |
 * |_______|_______| <---- 2048 + ?
 * |       ^       |
 * |       |       |
 * |   batch       |
 * |    commands   |
 * |       |       |
 * |       |       |
 * +---------------+ <---- 0 + ?
 *
 */

#define BATCH_STATE_SPLIT 2048

void
gen7_gpgpu_fillfunc(struct intel_batchbuffer *batch,
		    struct igt_buf *dst,
		    unsigned x, unsigned y,
		    unsigned width, unsigned height,
		    uint8_t color)
{
	uint32_t curbe_buffer, interface_descriptor;
	uint32_t batch_end;

	intel_batchbuffer_flush(batch);

	/* setup states */
	batch->ptr = &batch->buffer[BATCH_STATE_SPLIT];

	/*
	 * const buffer needs to fill for every thread, but as we have just 1 thread
	 * per every group, so need only one curbe data.
	 *
	 * For each thread, just use thread group ID for buffer offset.
	 */
	curbe_buffer = gen7_fill_curbe_buffer_data(batch, color);

	interface_descriptor = gen7_fill_interface_descriptor(batch, dst,
							      gen7_gpgpu_kernel,
							      sizeof(gen7_gpgpu_kernel));
	igt_assert(batch->ptr < &batch->buffer[4095]);

	batch->ptr = batch->buffer;

	/* GPGPU pipeline */
	OUT_BATCH(GEN7_PIPELINE_SELECT | PIPELINE_SELECT_GPGPU);

	gen7_emit_state_base_address(batch);

	gen7_emit_vfe_state_gpgpu(batch);

	gen7_emit_curbe_load(batch, curbe_buffer);

	gen7_emit_interface_descriptor_load(batch, interface_descriptor);

	gen7_emit_gpgpu_walk(batch, x, y, width, height);

	OUT_BATCH(MI_BATCH_BUFFER_END);

	batch_end = batch_align(batch, 8);
	igt_assert(batch_end < BATCH_STATE_SPLIT);

	gen7_render_flush(batch, batch_end);
	intel_batchbuffer_reset(batch);
}