/*
 * Copyright (C) 2008 VMware, Inc.
 * Copyright (C) 2014 Broadcom
 * Copyright (C) 2018 Alyssa Rosenzweig
 * Copyright (C) 2019 Collabora, Ltd.
 *
 * 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 "util/u_debug.h"
#include "util/u_memory.h"
#include "util/u_format.h"
#include "util/u_format_s3tc.h"
#include "util/u_video.h"
#include "util/u_screen.h"
#include "util/os_time.h"
#include "pipe/p_defines.h"
#include "pipe/p_screen.h"
#include "draw/draw_context.h"
#include <xf86drm.h>

#include <fcntl.h>

#include "drm-uapi/drm_fourcc.h"

#include "pan_screen.h"
#include "pan_resource.h"
#include "pan_public.h"
#include "pan_util.h"
#include "pandecode/decode.h"

#include "pan_context.h"
#include "midgard/midgard_compile.h"

static const struct debug_named_value debug_options[] = {
        {"msgs",      PAN_DBG_MSGS,	"Print debug messages"},
        {"trace",     PAN_DBG_TRACE,    "Trace the command stream"},
        {"deqp",      PAN_DBG_DEQP,     "Hacks for dEQP"},
        {"afbc",      PAN_DBG_AFBC,     "Enable non-conformant AFBC impl"},
        DEBUG_NAMED_VALUE_END
};

DEBUG_GET_ONCE_FLAGS_OPTION(pan_debug, "PAN_MESA_DEBUG", debug_options, 0)

int pan_debug = 0;

static const char *
panfrost_get_name(struct pipe_screen *screen)
{
        return "panfrost";
}

static const char *
panfrost_get_vendor(struct pipe_screen *screen)
{
        return "panfrost";
}

static const char *
panfrost_get_device_vendor(struct pipe_screen *screen)
{
        return "Arm";
}

static int
panfrost_get_param(struct pipe_screen *screen, enum pipe_cap param)
{
        /* We expose in-dev stuff for dEQP that we don't want apps to use yet */
        bool is_deqp = pan_debug & PAN_DBG_DEQP;

        switch (param) {
        case PIPE_CAP_NPOT_TEXTURES:
        case PIPE_CAP_MIXED_FRAMEBUFFER_SIZES:
        case PIPE_CAP_MIXED_COLOR_DEPTH_BITS:
        case PIPE_CAP_FRAGMENT_SHADER_TEXTURE_LOD:
        case PIPE_CAP_VERTEX_SHADER_SATURATE:
        case PIPE_CAP_POINT_SPRITE:
                return 1;

        case PIPE_CAP_MAX_RENDER_TARGETS:
                return is_deqp ? 4 : 1;

        case PIPE_CAP_OCCLUSION_QUERY:
                return 1;
        case PIPE_CAP_QUERY_TIME_ELAPSED:
        case PIPE_CAP_QUERY_PIPELINE_STATISTICS:
        case PIPE_CAP_QUERY_TIMESTAMP:
        case PIPE_CAP_QUERY_SO_OVERFLOW:
                return 0;

        case PIPE_CAP_TEXTURE_MIRROR_CLAMP:
        case PIPE_CAP_TEXTURE_SWIZZLE:
                return 1;

        case PIPE_CAP_TGSI_INSTANCEID:
        case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
                return is_deqp ? 1 : 0;

        case PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS:
                return is_deqp ? 4 : 0;
        case PIPE_CAP_MAX_STREAM_OUTPUT_SEPARATE_COMPONENTS:
        case PIPE_CAP_MAX_STREAM_OUTPUT_INTERLEAVED_COMPONENTS:
                return is_deqp ? 64 : 0;

        case PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS:
                return is_deqp ? 256 : 0; /* for GL3 */

        case PIPE_CAP_GLSL_FEATURE_LEVEL:
        case PIPE_CAP_GLSL_FEATURE_LEVEL_COMPATIBILITY:
                return is_deqp ? 140 : 120;
        case PIPE_CAP_ESSL_FEATURE_LEVEL:
                return is_deqp ? 300 : 120;

        case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
                return is_deqp ? 16 : 0;

        case PIPE_CAP_CUBE_MAP_ARRAY:
                return is_deqp;

        /* TODO: Where does this req come from in practice? */
        case PIPE_CAP_VERTEX_BUFFER_STRIDE_4BYTE_ALIGNED_ONLY:
                return 1;

        case PIPE_CAP_MAX_TEXTURE_2D_SIZE:
                return 4096;
        case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
        case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
                return 13;

        case PIPE_CAP_BLEND_EQUATION_SEPARATE:
        case PIPE_CAP_INDEP_BLEND_ENABLE:
        case PIPE_CAP_INDEP_BLEND_FUNC:
                return 1;

        case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
                /* Hardware is natively upper left */
                return 0;

        case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
        case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
        case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
        case PIPE_CAP_GENERATE_MIPMAP:
                return 1;

        case PIPE_CAP_SEAMLESS_CUBE_MAP:
        case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:
                return 1;

        case PIPE_CAP_MAX_VERTEX_ELEMENT_SRC_OFFSET:
                return 0xffff;

        case PIPE_CAP_TEXTURE_BUFFER_OBJECTS:
                return 1;

        case PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE:
                return 65536;

        case PIPE_CAP_PREFER_BLIT_BASED_TEXTURE_TRANSFER:
                return 0;

        case PIPE_CAP_ENDIANNESS:
                return PIPE_ENDIAN_NATIVE;

        case PIPE_CAP_SAMPLER_VIEW_TARGET:
                return 1;

        case PIPE_CAP_MIN_TEXTURE_GATHER_OFFSET:
                return -8;

        case PIPE_CAP_MAX_TEXTURE_GATHER_OFFSET:
                return 7;

        case PIPE_CAP_VENDOR_ID:
        case PIPE_CAP_DEVICE_ID:
                return 0xFFFFFFFF;

        case PIPE_CAP_ACCELERATED:
        case PIPE_CAP_UMA:
        case PIPE_CAP_TEXTURE_FLOAT_LINEAR:
        case PIPE_CAP_TEXTURE_HALF_FLOAT_LINEAR:
        case PIPE_CAP_COPY_BETWEEN_COMPRESSED_AND_PLAIN_FORMATS:
        case PIPE_CAP_TGSI_ARRAY_COMPONENTS:
                return 1;

        case PIPE_CAP_VIDEO_MEMORY: {
                uint64_t system_memory;

                if (!os_get_total_physical_memory(&system_memory))
                        return 0;

                return (int)(system_memory >> 20);
        }

        case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
                return 4;

        case PIPE_CAP_MAX_VARYINGS:
                return 16;

        default:
                return u_pipe_screen_get_param_defaults(screen, param);
        }
}

static int
panfrost_get_shader_param(struct pipe_screen *screen,
                          enum pipe_shader_type shader,
                          enum pipe_shader_cap param)
{
        if (shader != PIPE_SHADER_VERTEX &&
            shader != PIPE_SHADER_FRAGMENT) {
                return 0;
        }

        /* this is probably not totally correct.. but it's a start: */
        switch (param) {
        case PIPE_SHADER_CAP_SCALAR_ISA:
                return 0;

        case PIPE_SHADER_CAP_MAX_INSTRUCTIONS:
                return 0;
        case PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS:
        case PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS:
        case PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS:
                return 16384;

        case PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH:
                return 1024;

        case PIPE_SHADER_CAP_MAX_INPUTS:
                return 16;

        case PIPE_SHADER_CAP_MAX_OUTPUTS:
                return shader == PIPE_SHADER_FRAGMENT ? 4 : 8;

        case PIPE_SHADER_CAP_MAX_TEMPS:
                return 256; /* GL_MAX_PROGRAM_TEMPORARIES_ARB */

        case PIPE_SHADER_CAP_MAX_CONST_BUFFER_SIZE:
                return 16 * 1024 * sizeof(float);

        case PIPE_SHADER_CAP_MAX_CONST_BUFFERS:
                return PAN_MAX_CONST_BUFFERS;

        case PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED:
                return 0;

        case PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR:
                return 1;
        case PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR:
                return 0;

        case PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR:
                return 0;

        case PIPE_SHADER_CAP_INDIRECT_CONST_ADDR:
                return 1;

        case PIPE_SHADER_CAP_SUBROUTINES:
                return 0;

        case PIPE_SHADER_CAP_TGSI_SQRT_SUPPORTED:
                return 0;

        case PIPE_SHADER_CAP_INTEGERS:
                return 1;

        case PIPE_SHADER_CAP_INT64_ATOMICS:
        case PIPE_SHADER_CAP_FP16:
        case PIPE_SHADER_CAP_TGSI_DROUND_SUPPORTED:
        case PIPE_SHADER_CAP_TGSI_DFRACEXP_DLDEXP_SUPPORTED:
        case PIPE_SHADER_CAP_TGSI_LDEXP_SUPPORTED:
        case PIPE_SHADER_CAP_TGSI_FMA_SUPPORTED:
        case PIPE_SHADER_CAP_TGSI_ANY_INOUT_DECL_RANGE:
                return 0;

        case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
        case PIPE_SHADER_CAP_MAX_SAMPLER_VIEWS:
                return 16; /* XXX: How many? */

        case PIPE_SHADER_CAP_PREFERRED_IR:
                return PIPE_SHADER_IR_NIR;

        case PIPE_SHADER_CAP_SUPPORTED_IRS:
                return 0;

        case PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT:
                return 32;

        case PIPE_SHADER_CAP_MAX_SHADER_BUFFERS:
        case PIPE_SHADER_CAP_MAX_SHADER_IMAGES:
        case PIPE_SHADER_CAP_LOWER_IF_THRESHOLD:
        case PIPE_SHADER_CAP_TGSI_SKIP_MERGE_REGISTERS:
        case PIPE_SHADER_CAP_MAX_HW_ATOMIC_COUNTERS:
        case PIPE_SHADER_CAP_MAX_HW_ATOMIC_COUNTER_BUFFERS:
                return 0;

        default:
                fprintf(stderr, "unknown shader param %d\n", param);
                return 0;
        }

        return 0;
}

static float
panfrost_get_paramf(struct pipe_screen *screen, enum pipe_capf param)
{
        switch (param) {
        case PIPE_CAPF_MAX_LINE_WIDTH:

        /* fall-through */
        case PIPE_CAPF_MAX_LINE_WIDTH_AA:
                return 255.0; /* arbitrary */

        case PIPE_CAPF_MAX_POINT_WIDTH:

        /* fall-through */
        case PIPE_CAPF_MAX_POINT_WIDTH_AA:
                return 1024.0;

        case PIPE_CAPF_MAX_TEXTURE_ANISOTROPY:
                return 16.0;

        case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
                return 16.0; /* arbitrary */

        case PIPE_CAPF_MIN_CONSERVATIVE_RASTER_DILATE:
        case PIPE_CAPF_MAX_CONSERVATIVE_RASTER_DILATE:
        case PIPE_CAPF_CONSERVATIVE_RASTER_DILATE_GRANULARITY:
                return 0.0f;

        default:
                debug_printf("Unexpected PIPE_CAPF %d query\n", param);
                return 0.0;
        }
}

/**
 * Query format support for creating a texture, drawing surface, etc.
 * \param format  the format to test
 * \param type  one of PIPE_TEXTURE, PIPE_SURFACE
 */
static boolean
panfrost_is_format_supported( struct pipe_screen *screen,
                              enum pipe_format format,
                              enum pipe_texture_target target,
                              unsigned sample_count,
                              unsigned storage_sample_count,
                              unsigned bind)
{
        const struct util_format_description *format_desc;

        assert(target == PIPE_BUFFER ||
               target == PIPE_TEXTURE_1D ||
               target == PIPE_TEXTURE_1D_ARRAY ||
               target == PIPE_TEXTURE_2D ||
               target == PIPE_TEXTURE_2D_ARRAY ||
               target == PIPE_TEXTURE_RECT ||
               target == PIPE_TEXTURE_3D ||
               target == PIPE_TEXTURE_CUBE ||
               target == PIPE_TEXTURE_CUBE_ARRAY);

        format_desc = util_format_description(format);

        if (!format_desc)
                return FALSE;

        if (sample_count > 1)
                return FALSE;

        /* Format wishlist */
        if (format == PIPE_FORMAT_X8Z24_UNORM)
                return FALSE;

        if (format == PIPE_FORMAT_A1B5G5R5_UNORM || format == PIPE_FORMAT_X1B5G5R5_UNORM)
                return FALSE;

        /* TODO */
        if (format == PIPE_FORMAT_B5G5R5A1_UNORM)
                return FALSE;

        /* Don't confuse poorly written apps (workaround dEQP bug) that expect
         * more alpha than they ask for */

        bool scanout = bind & (PIPE_BIND_SCANOUT | PIPE_BIND_SHARED | PIPE_BIND_DISPLAY_TARGET);
        bool renderable = bind & PIPE_BIND_RENDER_TARGET;

        if (scanout && renderable && !util_format_is_rgba8_variant(format_desc))
                return FALSE;

        if (format_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN &&
            format_desc->layout != UTIL_FORMAT_LAYOUT_OTHER) {
                /* Compressed formats not yet hooked up. */
                return FALSE;
        }

        /* Internally, formats that are depth/stencil renderable are limited.
         *
         * In particular: Z16, Z24, Z24S8, S8 are all identical from the GPU
         * rendering perspective. That is, we render to Z24S8 (which we can
         * AFBC compress), ignore the different when texturing (who cares?),
         * and then in the off-chance there's a CPU read we blit back to
         * staging.
         *
         * ...alternatively, we can make the state tracker deal with that. */

        if (bind & PIPE_BIND_DEPTH_STENCIL) {
                switch (format) {
                        case PIPE_FORMAT_Z24_UNORM_S8_UINT:
                        case PIPE_FORMAT_Z24X8_UNORM:
                        case PIPE_FORMAT_Z32_UNORM:
                        case PIPE_FORMAT_Z32_FLOAT:
                        case PIPE_FORMAT_Z32_FLOAT_S8X24_UINT:
                                return true;

                        default:
                                return false;
                }
        }

        return TRUE;
}


static void
panfrost_destroy_screen(struct pipe_screen *pscreen)
{
        struct panfrost_screen *screen = pan_screen(pscreen);
        panfrost_bo_cache_evict_all(screen);
        ralloc_free(screen);
}

static void
panfrost_flush_frontbuffer(struct pipe_screen *_screen,
                           struct pipe_resource *resource,
                           unsigned level, unsigned layer,
                           void *context_private,
                           struct pipe_box *sub_box)
{
        /* TODO: Display target integration */
}

static uint64_t
panfrost_get_timestamp(struct pipe_screen *_screen)
{
        return os_time_get_nano();
}

static void
panfrost_fence_reference(struct pipe_screen *pscreen,
                         struct pipe_fence_handle **ptr,
                         struct pipe_fence_handle *fence)
{
        panfrost_drm_fence_reference(pscreen, ptr, fence);
}

static boolean
panfrost_fence_finish(struct pipe_screen *pscreen,
                      struct pipe_context *ctx,
                      struct pipe_fence_handle *fence,
                      uint64_t timeout)
{
        return panfrost_drm_fence_finish(pscreen, ctx, fence, timeout);
}

static const void *
panfrost_screen_get_compiler_options(struct pipe_screen *pscreen,
                                     enum pipe_shader_ir ir,
                                     enum pipe_shader_type shader)
{
        return &midgard_nir_options;
}

struct pipe_screen *
panfrost_create_screen(int fd, struct renderonly *ro)
{
        struct panfrost_screen *screen = rzalloc(NULL, struct panfrost_screen);

        pan_debug = debug_get_option_pan_debug();

        if (!screen)
                return NULL;

        if (ro) {
                screen->ro = renderonly_dup(ro);
                if (!screen->ro) {
                        fprintf(stderr, "Failed to dup renderonly object\n");
                        free(screen);
                        return NULL;
                }
        }

        screen->fd = fd;

        screen->gpu_id = panfrost_drm_query_gpu_version(screen);

        /* Check if we're loading against a supported GPU model. */

        switch (screen->gpu_id) {
        case 0x750: /* T760 */
        case 0x820: /* T820 */
        case 0x860: /* T860 */
                break;
        default:
                /* Fail to load against untested models */
                debug_printf("panfrost: Unsupported model %X",
                             screen->gpu_id);
                return NULL;
        }

        util_dynarray_init(&screen->transient_bo, screen);

        for (unsigned i = 0; i < ARRAY_SIZE(screen->bo_cache); ++i)
                list_inithead(&screen->bo_cache[i]);

        if (pan_debug & PAN_DBG_TRACE)
                pandecode_initialize();

        screen->base.destroy = panfrost_destroy_screen;

        screen->base.get_name = panfrost_get_name;
        screen->base.get_vendor = panfrost_get_vendor;
        screen->base.get_device_vendor = panfrost_get_device_vendor;
        screen->base.get_param = panfrost_get_param;
        screen->base.get_shader_param = panfrost_get_shader_param;
        screen->base.get_paramf = panfrost_get_paramf;
        screen->base.get_timestamp = panfrost_get_timestamp;
        screen->base.is_format_supported = panfrost_is_format_supported;
        screen->base.context_create = panfrost_create_context;
        screen->base.flush_frontbuffer = panfrost_flush_frontbuffer;
        screen->base.get_compiler_options = panfrost_screen_get_compiler_options;
        screen->base.fence_reference = panfrost_fence_reference;
        screen->base.fence_finish = panfrost_fence_finish;

        screen->last_fragment_flushed = true;
        screen->last_job = NULL;

        panfrost_resource_screen_init(screen);

        return &screen->base;
}