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_staging_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    /* For the checks below to be able to use 'usage', we assume that
  82     * transfer preparation doesn't affect the usage.
  83     */
  84    assert(usage == trans->base.usage);
  85
  86    /* If we are doing a whole resource discard with a hw_res map, the buffer
  87     * storage can now be considered unused and we don't care about previous
  88     * contents.  We can thus mark the storage as uninitialized, but only if the
  89     * buffer is not host writable (in which case we can't clear the valid
  90     * range, since that would result in missed readbacks in future transfers).
  91     * We only do this for VIRGL_TRANSFER_MAP_HW_RES, since for
  92     * VIRGL_TRANSFER_MAP_REALLOC we already take care of the buffer range when
  93     * reallocating and rebinding, and VIRGL_TRANSFER_MAP_STAGING is not
  94     * currently used for whole resource discards.
  95     */
  96    if (map_type == VIRGL_TRANSFER_MAP_HW_RES &&
  97        (usage & PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE) &&
  98        (vbuf->clean_mask & 1)) {
  99       util_range_set_empty(&vbuf->valid_buffer_range);
 100    }
 101
 102    if (usage & PIPE_TRANSFER_WRITE)
 103        util_range_add(&vbuf->valid_buffer_range, box->x, box->x + box->width);
 104
 105    *transfer = &trans->base;
 106    return map_addr;
 107 }
 108
 109 static void virgl_buffer_transfer_unmap(struct pipe_context *ctx,
 110                                         struct pipe_transfer *transfer)
 111 {
 112    struct virgl_context *vctx = virgl_context(ctx);
 113    struct virgl_transfer *trans = virgl_transfer(transfer);
 114
 115    if (trans->base.usage & PIPE_TRANSFER_WRITE) {
 116       if (transfer->usage & PIPE_TRANSFER_FLUSH_EXPLICIT) {
 117          if (trans->range.end <= trans->range.start) {
 118             virgl_resource_destroy_transfer(vctx, trans);
 119             return;
 120          }
 121
 122          transfer->box.x += trans->range.start;
 123          transfer->box.width = trans->range.end - trans->range.start;
 124          trans->offset = transfer->box.x;
 125       }
 126
 127       if (trans->copy_src_hw_res) {
 128          virgl_encode_copy_transfer(vctx, trans);
 129          virgl_resource_destroy_transfer(vctx, trans);
 130       } else {
 131          virgl_transfer_queue_unmap(&vctx->queue, trans);
 132       }
 133    } else
 134       virgl_resource_destroy_transfer(vctx, trans);
 135 }
 136
 137 static void virgl_buffer_transfer_flush_region(struct pipe_context *ctx,
 138                                                struct pipe_transfer *transfer,
 139                                                const struct pipe_box *box)
 140 {
 141    struct virgl_transfer *trans = virgl_transfer(transfer);
 142
 143    /*
 144     * FIXME: This is not optimal.  For example,
 145     *
 146     * glMapBufferRange(.., 0, 100, GL_MAP_FLUSH_EXPLICIT_BIT)
 147     * glFlushMappedBufferRange(.., 25, 30)
 148     * glFlushMappedBufferRange(.., 65, 70)
 149     *
 150     * We'll end up flushing 25 --> 70.
 151     */
 152    util_range_add(&trans->range, box->x, box->x + box->width);
 153 }
 154
 155 static const struct u_resource_vtbl virgl_buffer_vtbl =
 156 {
 157    u_default_resource_get_handle,            /* get_handle */
 158    virgl_resource_destroy,                   /* resource_destroy */
 159    virgl_buffer_transfer_map,                /* transfer_map */
 160    virgl_buffer_transfer_flush_region,       /* transfer_flush_region */
 161    virgl_buffer_transfer_unmap,              /* transfer_unmap */
 162 };
 163
 164 void virgl_buffer_init(struct virgl_resource *res)
 165 {
 166    res->u.vtbl = &virgl_buffer_vtbl;
 167 }