src/gallium/drivers/virgl/virgl_buffer.c

   1 /*
   2  * Copyright 2014, 2015 Red Hat.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * on the rights to use, copy, modify, merge, publish, distribute, sub
   8  * license, and/or sell copies of the Software, and to permit persons to whom
   9  * the Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  18  * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  21  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 #include "util/u_inlines.h"
  25 #include "util/u_memory.h"
  26 #include "virgl_context.h"
  27 #include "virgl_encode.h"
  28 #include "virgl_resource.h"
  29 #include "virgl_screen.h"
  30
  31 static void *virgl_buffer_transfer_map(struct pipe_context *ctx,
  32                                        struct pipe_resource *resource,
  33                                        unsigned level,
  34                                        unsigned usage,
  35                                        const struct pipe_box *box,
  36                                        struct pipe_transfer **transfer)
  37 {
  38    struct virgl_context *vctx = virgl_context(ctx);
  39    struct virgl_screen *vs = virgl_screen(ctx->screen);
  40    struct virgl_resource *vbuf = virgl_resource(resource);
  41    struct virgl_transfer *trans;
  42    enum virgl_transfer_map_type map_type;
  43    void *map_addr;
  44
  45    trans = virgl_resource_create_transfer(vctx, resource,
  46                                           &vbuf->metadata, level, usage, box);
  47
  48    map_type = virgl_resource_transfer_prepare(vctx, trans);
  49    switch (map_type) {
  50    case VIRGL_TRANSFER_MAP_REALLOC:
  51       if (!virgl_resource_realloc(vctx, vbuf)) {
  52          map_addr = NULL;
  53          break;
  54       }
  55       vs->vws->resource_reference(vs->vws, &trans->hw_res, vbuf->hw_res);
  56       /* fall through */
  57    case VIRGL_TRANSFER_MAP_HW_RES:
  58       trans->hw_res_map = vs->vws->resource_map(vs->vws, vbuf->hw_res);
  59       if (trans->hw_res_map)
  60          map_addr = trans->hw_res_map + trans->offset;
  61       else
  62          map_addr = NULL;
  63       break;
  64    case VIRGL_TRANSFER_MAP_STAGING:
  65       map_addr = virgl_transfer_uploader_map(vctx, trans);
  66       /* Copy transfers don't make use of hw_res_map at the moment. */
  67       trans->hw_res_map = NULL;
  68       break;
  69    case VIRGL_TRANSFER_MAP_ERROR:
  70    default:
  71       trans->hw_res_map = NULL;
  72       map_addr = NULL;
  73       break;
  74    }
  75
  76    if (!map_addr) {
  77       virgl_resource_destroy_transfer(vctx, trans);
  78       return NULL;
  79    }
  80
  81    if (usage & PIPE_TRANSFER_WRITE)
  82        util_range_add(&vbuf->valid_buffer_range, box->x, box->x + box->width);
  83
  84    *transfer = &trans->base;
  85    return map_addr;
  86 }
  87
  88 static void virgl_buffer_transfer_unmap(struct pipe_context *ctx,
  89                                         struct pipe_transfer *transfer)
  90 {
  91    struct virgl_context *vctx = virgl_context(ctx);
  92    struct virgl_transfer *trans = virgl_transfer(transfer);
  93    struct virgl_screen *vs = virgl_screen(ctx->screen);
  94    struct pipe_resource *res = transfer->resource;
  95
  96    /* We don't need to transfer the contents of staging buffers, since they
  97     * don't have any host-side storage. */
  98    if (pipe_to_virgl_bind(vs, res->bind, res->flags) == VIRGL_BIND_STAGING) {
  99       virgl_resource_destroy_transfer(vctx, trans);
 100       return;
 101    }
 102
 103    if (trans->base.usage & PIPE_TRANSFER_WRITE) {
 104       if (transfer->usage & PIPE_TRANSFER_FLUSH_EXPLICIT) {
 105          if (trans->range.end <= trans->range.start) {
 106             virgl_resource_destroy_transfer(vctx, trans);
 107             return;
 108          }
 109
 110          transfer->box.x += trans->range.start;
 111          transfer->box.width = trans->range.end - trans->range.start;
 112          trans->offset = transfer->box.x;
 113       }
 114
 115       if (trans->copy_src_hw_res) {
 116          virgl_encode_copy_transfer(vctx, trans);
 117          /* It's now safe for other mappings to use the transfer_uploader. */
 118          vctx->transfer_uploader_in_use = false;
 119          virgl_resource_destroy_transfer(vctx, trans);
 120       } else {
 121          virgl_transfer_queue_unmap(&vctx->queue, trans);
 122       }
 123    } else
 124       virgl_resource_destroy_transfer(vctx, trans);
 125 }
 126
 127 static void virgl_buffer_transfer_flush_region(struct pipe_context *ctx,
 128                                                struct pipe_transfer *transfer,
 129                                                const struct pipe_box *box)
 130 {
 131    struct virgl_transfer *trans = virgl_transfer(transfer);
 132
 133    /*
 134     * FIXME: This is not optimal.  For example,
 135     *
 136     * glMapBufferRange(.., 0, 100, GL_MAP_FLUSH_EXPLICIT_BIT)
 137     * glFlushMappedBufferRange(.., 25, 30)
 138     * glFlushMappedBufferRange(.., 65, 70)
 139     *
 140     * We'll end up flushing 25 --> 70.
 141     */
 142    util_range_add(&trans->range, box->x, box->x + box->width);
 143 }
 144
 145 static const struct u_resource_vtbl virgl_buffer_vtbl =
 146 {
 147    u_default_resource_get_handle,            /* get_handle */
 148    virgl_resource_destroy,                   /* resource_destroy */
 149    virgl_buffer_transfer_map,                /* transfer_map */
 150    virgl_buffer_transfer_flush_region,       /* transfer_flush_region */
 151    virgl_buffer_transfer_unmap,              /* transfer_unmap */
 152 };
 153
 154 void virgl_buffer_init(struct virgl_resource *res)
 155 {
 156    res->u.vtbl = &virgl_buffer_vtbl;
 157 }