/*
 * Copyright 2014 Advanced Micro Devices, Inc.
 *
 * 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 "ac_binary.h"

#include "util/u_math.h"
#include "util/u_memory.h"

#include <gelf.h>
#include <libelf.h>
#include <stdio.h>

#include <sid.h>

#define SPILLED_SGPRS                                     0x4
#define SPILLED_VGPRS                                     0x8

/* Parse configuration data in .AMDGPU.config section format. */
void ac_parse_shader_binary_config(const char *data, size_t nbytes,
				   unsigned wave_size,
				   bool really_needs_scratch,
				   struct ac_shader_config *conf)
{
	uint32_t scratch_size = 0;

	for (size_t i = 0; i < nbytes; i += 8) {
		unsigned reg = util_le32_to_cpu(*(uint32_t*)(data + i));
		unsigned value = util_le32_to_cpu(*(uint32_t*)(data + i + 4));
		switch (reg) {
		case R_00B028_SPI_SHADER_PGM_RSRC1_PS:
		case R_00B128_SPI_SHADER_PGM_RSRC1_VS:
		case R_00B228_SPI_SHADER_PGM_RSRC1_GS:
		case R_00B848_COMPUTE_PGM_RSRC1:
		case R_00B428_SPI_SHADER_PGM_RSRC1_HS:
			if (wave_size == 32)
				conf->num_vgprs = MAX2(conf->num_vgprs, (G_00B028_VGPRS(value) + 1) * 8);
			else
				conf->num_vgprs = MAX2(conf->num_vgprs, (G_00B028_VGPRS(value) + 1) * 4);

			conf->num_sgprs = MAX2(conf->num_sgprs, (G_00B028_SGPRS(value) + 1) * 8);
			/* TODO: LLVM doesn't set FLOAT_MODE for non-compute shaders */
			conf->float_mode =  G_00B028_FLOAT_MODE(value);
			conf->rsrc1 = value;
			break;
		case R_00B02C_SPI_SHADER_PGM_RSRC2_PS:
			conf->lds_size = MAX2(conf->lds_size, G_00B02C_EXTRA_LDS_SIZE(value));
			/* TODO: LLVM doesn't set SHARED_VGPR_CNT for all shader types */
			conf->num_shared_vgprs = G_00B02C_SHARED_VGPR_CNT(value);
			conf->rsrc2 = value;
			break;
		case R_00B12C_SPI_SHADER_PGM_RSRC2_VS:
			conf->num_shared_vgprs = G_00B12C_SHARED_VGPR_CNT(value);
			conf->rsrc2 = value;
			break;
		case R_00B22C_SPI_SHADER_PGM_RSRC2_GS:
			conf->num_shared_vgprs = G_00B22C_SHARED_VGPR_CNT(value);
			conf->rsrc2 = value;
			break;
		case R_00B42C_SPI_SHADER_PGM_RSRC2_HS:
			conf->num_shared_vgprs = G_00B42C_SHARED_VGPR_CNT(value);
			conf->rsrc2 = value;
			break;
		case R_00B84C_COMPUTE_PGM_RSRC2:
			conf->lds_size = MAX2(conf->lds_size, G_00B84C_LDS_SIZE(value));
			conf->rsrc2 = value;
			break;
		case R_00B8A0_COMPUTE_PGM_RSRC3:
			conf->num_shared_vgprs = G_00B8A0_SHARED_VGPR_CNT(value);
			conf->rsrc3 = value;
			break;
		case R_0286CC_SPI_PS_INPUT_ENA:
			conf->spi_ps_input_ena = value;
			break;
		case R_0286D0_SPI_PS_INPUT_ADDR:
			conf->spi_ps_input_addr = value;
			break;
		case R_0286E8_SPI_TMPRING_SIZE:
		case R_00B860_COMPUTE_TMPRING_SIZE:
			/* WAVESIZE is in units of 256 dwords. */
			scratch_size = value;
			break;
		case SPILLED_SGPRS:
			conf->spilled_sgprs = value;
			break;
		case SPILLED_VGPRS:
			conf->spilled_vgprs = value;
			break;
		default:
			{
				static bool printed;

				if (!printed) {
					fprintf(stderr, "Warning: LLVM emitted unknown "
						"config register: 0x%x\n", reg);
					printed = true;
				}
			}
			break;
		}
	}

	if (!conf->spi_ps_input_addr)
		conf->spi_ps_input_addr = conf->spi_ps_input_ena;

	if (really_needs_scratch) {
		/* sgprs spills aren't spilling */
	        conf->scratch_bytes_per_wave = G_00B860_WAVESIZE(scratch_size) * 256 * 4;
	}

	/* Enable 64-bit and 16-bit denormals, because there is no performance
	 * cost.
	 *
	 * Don't enable denormals for 32-bit floats, because:
	 * - denormals disable output modifiers
	 * - denormals break v_mad_f32
	 * - GFX6 & GFX7 would be very slow
	 */
	conf->float_mode &= ~V_00B028_FP_ALL_DENORMS;
	conf->float_mode |= V_00B028_FP_64_DENORMS;
}