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_resource.h"
  28 #include "virgl_screen.h"
  29
  30 static void *virgl_buffer_transfer_map(struct pipe_context *ctx,
  31                                        struct pipe_resource *resource,
  32                                        unsigned level,
  33                                        unsigned usage,
  34                                        const struct pipe_box *box,
  35                                        struct pipe_transfer **transfer)
  36 {
  37    struct virgl_context *vctx = virgl_context(ctx);
  38    struct virgl_screen *vs = virgl_screen(ctx->screen);
  39    struct virgl_resource *vbuf = virgl_resource(resource);
  40    struct virgl_transfer *trans;
  41    void *ptr;
  42    bool readback;
  43    bool flush = false;
  44
  45    trans = virgl_resource_create_transfer(&vctx->transfer_pool, resource,
  46                                           &vbuf->metadata, level, usage, box);
  47    if (usage & PIPE_TRANSFER_READ)
  48       flush = true;
  49    else
  50       flush = virgl_res_needs_flush(vctx, trans);
  51
  52    if (flush)
  53       ctx->flush(ctx, NULL, 0);
  54
  55    readback = virgl_res_needs_readback(vctx, vbuf, usage, 0);
  56    if (readback) {
  57       vs->vws->transfer_get(vs->vws, vbuf->hw_res, box, trans->base.stride,
  58                             trans->l_stride, trans->offset, level);
  59
  60       vs->vws->resource_wait(vs->vws, vbuf->hw_res);
  61    }
  62
  63    ptr = vs->vws->resource_map(vs->vws, vbuf->hw_res);
  64    if (!ptr) {
  65       virgl_resource_destroy_transfer(&vctx->transfer_pool, trans);
  66       return NULL;
  67    }
  68
  69    *transfer = &trans->base;
  70    return ptr + trans->offset;
  71 }
  72
  73 static void virgl_buffer_transfer_unmap(struct pipe_context *ctx,
  74                                         struct pipe_transfer *transfer)
  75 {
  76    struct virgl_context *vctx = virgl_context(ctx);
  77    struct virgl_transfer *trans = virgl_transfer(transfer);
  78
  79    if (trans->base.usage & PIPE_TRANSFER_WRITE) {
  80       if (transfer->usage & PIPE_TRANSFER_FLUSH_EXPLICIT) {
  81          if (trans->range.end <= trans->range.start) {
  82             virgl_resource_destroy_transfer(&vctx->transfer_pool, trans);
  83             return;
  84          }
  85
  86          transfer->box.x += trans->range.start;
  87          transfer->box.width = trans->range.end - trans->range.start;
  88          trans->offset = transfer->box.x;
  89       }
  90
  91       vctx->num_transfers++;
  92       virgl_transfer_queue_unmap(&vctx->queue, trans);
  93    } else
  94       virgl_resource_destroy_transfer(&vctx->transfer_pool, trans);
  95 }
  96
  97 static void virgl_buffer_transfer_flush_region(struct pipe_context *ctx,
  98                                                struct pipe_transfer *transfer,
  99                                                const struct pipe_box *box)
 100 {
 101    struct virgl_transfer *trans = virgl_transfer(transfer);
 102
 103    /*
 104     * FIXME: This is not optimal.  For example,
 105     *
 106     * glMapBufferRange(.., 0, 100, GL_MAP_FLUSH_EXPLICIT_BIT)
 107     * glFlushMappedBufferRange(.., 25, 30)
 108     * glFlushMappedBufferRange(.., 65, 70)
 109     *
 110     * We'll end up flushing 25 --> 70.
 111     */
 112    util_range_add(&trans->range, box->x, box->x + box->width);
 113 }
 114
 115 static const struct u_resource_vtbl virgl_buffer_vtbl =
 116 {
 117    u_default_resource_get_handle,            /* get_handle */
 118    virgl_resource_destroy,                   /* resource_destroy */
 119    virgl_buffer_transfer_map,                /* transfer_map */
 120    virgl_buffer_transfer_flush_region,       /* transfer_flush_region */
 121    virgl_buffer_transfer_unmap,              /* transfer_unmap */
 122 };
 123
 124 void virgl_buffer_init(struct virgl_resource *res)
 125 {
 126    res->u.vtbl = &virgl_buffer_vtbl;
 127 }