icd/intel/cmd_prepare.c

/*
 * XGL
 *
 * Copyright (C) 2014 LunarG, 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 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:
 *   Chia-I Wu <olv@lunarg.com>
 */

#include "genhw/genhw.h"
#include "img.h"
#include "buf.h"
#include "cmd_priv.h"

enum {
    MEM_CACHE        = 1 << 0,
    DATA_READ_CACHE  = 1 << 1,
    DATA_WRITE_CACHE = 1 << 2,
    RENDER_CACHE     = 1 << 3,
    SAMPLER_CACHE    = 1 << 4,
};

static uint32_t img_get_layout_caches(const struct intel_img *img,
                                     XGL_IMAGE_LAYOUT layout)
{
    uint32_t caches;

    switch (layout) {
    case XGL_IMAGE_LAYOUT_GENERAL:
        // General layout when image can be used for any kind of access
        caches = MEM_CACHE | DATA_READ_CACHE | DATA_WRITE_CACHE | RENDER_CACHE | SAMPLER_CACHE;
        break;
    case XGL_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL:
        // Optimal layout when image is only used for color attachment read/write
        caches = DATA_WRITE_CACHE | RENDER_CACHE;
        break;
    case XGL_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL:
        // Optimal layout when image is only used for depth/stencil attachment read/write
        caches = DATA_WRITE_CACHE | RENDER_CACHE;
        break;
    case XGL_IMAGE_LAYOUT_DEPTH_STENCIL_READ_ONLY_OPTIMAL:
        // Optimal layout when image is used for read only depth/stencil attachment and shader access
        caches = RENDER_CACHE;
        break;
    case XGL_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL:
        // Optimal layout when image is used for read only shader access
        caches = DATA_READ_CACHE | SAMPLER_CACHE;
        break;
    case XGL_IMAGE_LAYOUT_CLEAR_OPTIMAL:
        // Optimal layout when image is used only for clear operations
        caches = RENDER_CACHE;
        break;
    case XGL_IMAGE_LAYOUT_TRANSFER_SOURCE_OPTIMAL:
        // Optimal layout when image is used only as source of transfer operations
        caches = MEM_CACHE | DATA_READ_CACHE | RENDER_CACHE | SAMPLER_CACHE;
        break;
    case XGL_IMAGE_LAYOUT_TRANSFER_DESTINATION_OPTIMAL:
        // Optimal layout when image is used only as destination of transfer operations
        caches = MEM_CACHE | DATA_WRITE_CACHE | RENDER_CACHE;
        break;
    default:
        caches = 0;
        break;
    }

    return caches;
}

static uint32_t cmd_get_flush_flags(const struct intel_cmd *cmd,
                                    uint32_t old_caches,
                                    uint32_t new_caches,
                                    bool is_ds)
{
    uint32_t flags = 0;

    /* not dirty */
    if (!(old_caches & (MEM_CACHE | RENDER_CACHE | DATA_WRITE_CACHE)))
        return 0;

    if ((old_caches & RENDER_CACHE) && (new_caches & ~RENDER_CACHE)) {
        if (is_ds)
            flags |= GEN6_PIPE_CONTROL_DEPTH_CACHE_FLUSH;
        else
            flags |= GEN6_PIPE_CONTROL_RENDER_CACHE_FLUSH;
    }

    if ((old_caches & DATA_WRITE_CACHE) &&
        (new_caches & ~(DATA_READ_CACHE | DATA_WRITE_CACHE))) {
        if (cmd_gen(cmd) >= INTEL_GEN(7))
            flags |= GEN7_PIPE_CONTROL_DC_FLUSH_ENABLE;
    }

    if (new_caches & SAMPLER_CACHE)
        flags |= GEN6_PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE;

    if ((new_caches & DATA_READ_CACHE) && old_caches != DATA_WRITE_CACHE)
        flags |= GEN6_PIPE_CONTROL_CONSTANT_CACHE_INVALIDATE;

    if (!flags)
        return 0;

    flags |= GEN6_PIPE_CONTROL_CS_STALL;

    return flags;
}

static void cmd_memory_barriers(struct intel_cmd *cmd,
				                uint32_t flush_flags,
                                uint32_t memory_barrier_count,
                                const void** memory_barriers)
{
    uint32_t i;
    XGL_FLAGS input_mask = 0;
    XGL_FLAGS output_mask = 0;

    for (i = 0; i < memory_barrier_count; i++) {

        const union {
            XGL_STRUCTURE_TYPE type;

            XGL_MEMORY_BARRIER mem;
            XGL_BUFFER_MEMORY_BARRIER buf;
            XGL_IMAGE_MEMORY_BARRIER img;
        } *u = memory_barriers[i];

        switch(u->type)
        {
        case XGL_STRUCTURE_TYPE_MEMORY_BARRIER:
            output_mask |= u->mem.outputMask;
            input_mask  |= u->mem.inputMask;
            break;
        case XGL_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER:
            output_mask |= u->buf.outputMask;
            input_mask  |= u->buf.inputMask;
            break;
        case XGL_STRUCTURE_TYPE_IMAGE_MEMORY_BARRIER:
            output_mask |= u->img.outputMask;
            input_mask  |= u->img.inputMask;
            {
                struct intel_img *img = intel_img(u->img.image);
                flush_flags |= cmd_get_flush_flags(cmd,
                        img_get_layout_caches(img, u->img.oldLayout),
                        img_get_layout_caches(img, u->img.newLayout),
                        icd_format_is_ds(img->layout.format));
            }
            break;
        default:
            break;
        }
    }

    if (output_mask & XGL_MEMORY_OUTPUT_SHADER_WRITE_BIT) {
        flush_flags |= GEN7_PIPE_CONTROL_DC_FLUSH_ENABLE;
    }
    if (output_mask & XGL_MEMORY_OUTPUT_COLOR_ATTACHMENT_BIT) {
        flush_flags |= GEN6_PIPE_CONTROL_RENDER_CACHE_FLUSH;
    }
    if (output_mask & XGL_MEMORY_OUTPUT_DEPTH_STENCIL_ATTACHMENT_BIT) {
        flush_flags |= GEN6_PIPE_CONTROL_DEPTH_CACHE_FLUSH;
    }

    /* CPU write is cache coherent, so XGL_MEMORY_OUTPUT_CPU_WRITE_BIT needs no flush. */
    /* Meta handles flushes, so XGL_MEMORY_OUTPUT_COPY_BIT needs no flush. */

    if (input_mask & (XGL_MEMORY_INPUT_SHADER_READ_BIT | XGL_MEMORY_INPUT_UNIFORM_READ_BIT)) {
        flush_flags |= GEN6_PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE;
    }

    if (input_mask & XGL_MEMORY_INPUT_UNIFORM_READ_BIT) {
        flush_flags |= GEN6_PIPE_CONTROL_CONSTANT_CACHE_INVALIDATE;
    }

    if (input_mask & XGL_MEMORY_INPUT_VERTEX_ATTRIBUTE_FETCH_BIT) {
        flush_flags |= GEN6_PIPE_CONTROL_VF_CACHE_INVALIDATE;
    }

    /* These bits have no corresponding cache invalidate operation.
     * XGL_MEMORY_INPUT_CPU_READ_BIT
     * XGL_MEMORY_INPUT_INDIRECT_COMMAND_BIT
     * XGL_MEMORY_INPUT_INDEX_FETCH_BIT
     * XGL_MEMORY_INPUT_COLOR_ATTACHMENT_BIT
     * XGL_MEMORY_INPUT_DEPTH_STENCIL_ATTACHMENT_BIT
     * XGL_MEMORY_INPUT_COPY_BIT
     */

    cmd_batch_flush(cmd, flush_flags);
}

ICD_EXPORT void XGLAPI xglCmdWaitEvents(
    XGL_CMD_BUFFER                              cmdBuffer,
    const XGL_EVENT_WAIT_INFO*                  pWaitInfo)
{
    struct intel_cmd *cmd = intel_cmd(cmdBuffer);

    /* This hardware will always wait at XGL_WAIT_EVENT_TOP_OF_PIPE.
     * Passing a pWaitInfo->waitEvent of XGL_WAIT_EVENT_BEFORE_FRAGMENT_PROCESSING
     * does not change that.
     */

    /* Because the command buffer is serialized, reaching
     * a pipelined wait is always after completion of prior events.
     * pWaitInfo->pEvents need not be examined.
     * xglCmdWaitEvents is equivalent to memory barrier part of xglCmdPipelineBarrier.
     * cmd_memory_barriers will wait for GEN6_PIPE_CONTROL_CS_STALL and perform
     * appropriate cache control.
     */
    cmd_memory_barriers(cmd,
            GEN6_PIPE_CONTROL_CS_STALL,
            pWaitInfo->memBarrierCount, pWaitInfo->pMemBarriers);
}

ICD_EXPORT void XGLAPI xglCmdPipelineBarrier(
    XGL_CMD_BUFFER                              cmdBuffer,
    const XGL_PIPELINE_BARRIER*                 pBarrier)
{
    struct intel_cmd *cmd = intel_cmd(cmdBuffer);
    uint32_t pipe_control_flags = 0;
    uint32_t i;

    /* This hardware will always wait at XGL_WAIT_EVENT_TOP_OF_PIPE.
     * Passing a pBarrier->waitEvent of XGL_WAIT_EVENT_BEFORE_FRAGMENT_PROCESSING
     * does not change that.
     */

    /* Cache control is done with PIPE_CONTROL flags.
     * With no GEN6_PIPE_CONTROL_CS_STALL flag set, it behaves as XGL_SET_EVENT_TOP_OF_PIPE.
     * All other pEvents values will behave as XGL_SET_EVENT_GPU_COMMANDS_COMPLETE.
     */
    for (i = 0; i < pBarrier->eventCount; i++) {
        switch(pBarrier->pEvents[i])
        {
        case XGL_SET_EVENT_TOP_OF_PIPE:
            break;
        case XGL_SET_EVENT_VERTEX_PROCESSING_COMPLETE:
        case XGL_SET_EVENT_FRAGMENT_PROCESSING_COMPLETE:
        case XGL_SET_EVENT_GRAPHICS_PIPELINE_COMPLETE:
        case XGL_SET_EVENT_COMPUTE_PIPELINE_COMPLETE:
        case XGL_SET_EVENT_TRANSFER_COMPLETE:
        case XGL_SET_EVENT_GPU_COMMANDS_COMPLETE:
            pipe_control_flags |= GEN6_PIPE_CONTROL_CS_STALL;
            break;
        default:
            cmd->result = XGL_ERROR_UNKNOWN;
            return;
            break;
        }
    }

    /* cmd_memory_barriers can wait for GEN6_PIPE_CONTROL_CS_STALL and perform
     * appropriate cache control.
     */
    cmd_memory_barriers(cmd,
            pipe_control_flags,
            pBarrier->memBarrierCount, pBarrier->pMemBarriers);
}