src/mesa/drivers/dri/intel/intel_batchbuffer.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2006 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include "intel_context.h"
  29 #include "intel_batchbuffer.h"
  30 #include "intel_decode.h"
  31 #include "intel_reg.h"
  32 #include "intel_bufmgr.h"
  33 #include "intel_buffers.h"
  34
  35 void
  36 intel_batchbuffer_reset(struct intel_batchbuffer *batch)
  37 {
  38    struct intel_context *intel = batch->intel;
  39
  40    if (batch->buf != NULL) {
  41       dri_bo_unreference(batch->buf);
  42       batch->buf = NULL;
  43    }
  44
  45    if (!batch->buffer)
  46       batch->buffer = malloc (intel->maxBatchSize);
  47
  48    batch->buf = dri_bo_alloc(intel->bufmgr, "batchbuffer",
  49                              intel->maxBatchSize, 4096);
  50    if (batch->buffer)
  51       batch->map = batch->buffer;
  52    else {
  53       dri_bo_map(batch->buf, GL_TRUE);
  54       batch->map = batch->buf->virtual;
  55    }
  56    batch->size = intel->maxBatchSize;
  57    batch->ptr = batch->map;
  58    batch->dirty_state = ~0;
  59 }
  60
  61 struct intel_batchbuffer *
  62 intel_batchbuffer_alloc(struct intel_context *intel)
  63 {
  64    struct intel_batchbuffer *batch = calloc(sizeof(*batch), 1);
  65
  66    batch->intel = intel;
  67    intel_batchbuffer_reset(batch);
  68
  69    return batch;
  70 }
  71
  72 void
  73 intel_batchbuffer_free(struct intel_batchbuffer *batch)
  74 {
  75    if (batch->buffer)
  76       free (batch->buffer);
  77    else {
  78       if (batch->map) {
  79          dri_bo_unmap(batch->buf);
  80          batch->map = NULL;
  81       }
  82    }
  83    dri_bo_unreference(batch->buf);
  84    batch->buf = NULL;
  85    free(batch);
  86 }
  87
  88
  89
  90 /* TODO: Push this whole function into bufmgr.
  91  */
  92 static void
  93 do_flush_locked(struct intel_batchbuffer *batch, GLuint used)
  94 {
  95    struct intel_context *intel = batch->intel;
  96    int ret = 0;
  97    int x_off = 0, y_off = 0;
  98
  99    if (batch->buffer)
 100       dri_bo_subdata (batch->buf, 0, used, batch->buffer);
 101    else
 102       dri_bo_unmap(batch->buf);
 103
 104    batch->map = NULL;
 105    batch->ptr = NULL;
 106
 107    dri_bo_exec(batch->buf, used, NULL, 0, (x_off & 0xffff) | (y_off << 16));
 108
 109    if (INTEL_DEBUG & DEBUG_BATCH) {
 110       dri_bo_map(batch->buf, GL_FALSE);
 111       intel_decode(batch->buf->virtual, used / 4, batch->buf->offset,
 112                    intel->intelScreen->deviceID);
 113       dri_bo_unmap(batch->buf);
 114
 115       if (intel->vtbl.debug_batch != NULL)
 116          intel->vtbl.debug_batch(intel);
 117    }
 118
 119    if (ret != 0) {
 120       exit(1);
 121    }
 122    intel->vtbl.new_batch(intel);
 123 }
 124
 125 void
 126 _intel_batchbuffer_flush(struct intel_batchbuffer *batch, const char *file,
 127                          int line)
 128 {
 129    struct intel_context *intel = batch->intel;
 130    GLuint used = batch->ptr - batch->map;
 131
 132    if (!intel->using_dri2_swapbuffers &&
 133        intel->first_post_swapbuffers_batch == NULL) {
 134       intel->first_post_swapbuffers_batch = intel->batch->buf;
 135       drm_intel_bo_reference(intel->first_post_swapbuffers_batch);
 136    }
 137
 138    if (used == 0)
 139       return;
 140
 141    if (INTEL_DEBUG & DEBUG_BATCH)
 142       fprintf(stderr, "%s:%d: Batchbuffer flush with %db used\n", file, line,
 143               used);
 144
 145    batch->reserved_space = 0;
 146    /* Emit a flush if the bufmgr doesn't do it for us. */
 147    if (intel->always_flush_cache) {
 148       intel_batchbuffer_emit_mi_flush(batch);
 149       used = batch->ptr - batch->map;
 150    }
 151
 152    /* Round batchbuffer usage to 2 DWORDs. */
 153
 154    if ((used & 4) == 0) {
 155       *(GLuint *) (batch->ptr) = 0; /* noop */
 156       batch->ptr += 4;
 157       used = batch->ptr - batch->map;
 158    }
 159
 160    /* Mark the end of the buffer. */
 161    *(GLuint *) (batch->ptr) = MI_BATCH_BUFFER_END;
 162    batch->ptr += 4;
 163    used = batch->ptr - batch->map;
 164    assert (used <= batch->buf->size);
 165
 166    /* Workaround for recursive batchbuffer flushing: If the window is
 167     * moved, we can get into a case where we try to flush during a
 168     * flush.  What happens is that when we try to grab the lock for
 169     * the first flush, we detect that the window moved which then
 170     * causes another flush (from the intel_draw_buffer() call in
 171     * intelUpdatePageFlipping()).  To work around this we reset the
 172     * batchbuffer tail pointer before trying to get the lock.  This
 173     * prevent the nested buffer flush, but a better fix would be to
 174     * avoid that in the first place. */
 175    batch->ptr = batch->map;
 176
 177    if (intel->vtbl.finish_batch)
 178       intel->vtbl.finish_batch(intel);
 179
 180    /* Check that we didn't just wrap our batchbuffer at a bad time. */
 181    assert(!intel->no_batch_wrap);
 182
 183    batch->reserved_space = BATCH_RESERVED;
 184
 185    /* TODO: Just pass the relocation list and dma buffer up to the
 186     * kernel.
 187     */
 188    do_flush_locked(batch, used);
 189
 190    if (INTEL_DEBUG & DEBUG_SYNC) {
 191       fprintf(stderr, "waiting for idle\n");
 192       dri_bo_map(batch->buf, GL_TRUE);
 193       dri_bo_unmap(batch->buf);
 194    }
 195
 196    /* Reset the buffer:
 197     */
 198    intel_batchbuffer_reset(batch);
 199 }
 200
 201
 202 /*  This is the only way buffers get added to the validate list.
 203  */
 204 GLboolean
 205 intel_batchbuffer_emit_reloc(struct intel_batchbuffer *batch,
 206                              dri_bo *buffer,
 207                              uint32_t read_domains, uint32_t write_domain,
 208                              uint32_t delta)
 209 {
 210    int ret;
 211
 212    if (batch->ptr - batch->map > batch->buf->size)
 213     printf ("bad relocation ptr %p map %p offset %d size %lu\n",
 214             batch->ptr, batch->map, batch->ptr - batch->map, batch->buf->size);
 215    ret = dri_bo_emit_reloc(batch->buf, read_domains, write_domain,
 216                            delta, batch->ptr - batch->map, buffer);
 217
 218    /*
 219     * Using the old buffer offset, write in what the right data would be, in case
 220     * the buffer doesn't move and we can short-circuit the relocation processing
 221     * in the kernel
 222     */
 223    intel_batchbuffer_emit_dword (batch, buffer->offset + delta);
 224
 225    return GL_TRUE;
 226 }
 227
 228 void
 229 intel_batchbuffer_data(struct intel_batchbuffer *batch,
 230                        const void *data, GLuint bytes)
 231 {
 232    assert((bytes & 3) == 0);
 233    intel_batchbuffer_require_space(batch, bytes);
 234    __memcpy(batch->ptr, data, bytes);
 235    batch->ptr += bytes;
 236 }
 237
 238 /* Emit a pipelined flush to either flush render and texture cache for
 239  * reading from a FBO-drawn texture, or flush so that frontbuffer
 240  * render appears on the screen in DRI1.
 241  *
 242  * This is also used for the always_flush_cache driconf debug option.
 243  */
 244 void
 245 intel_batchbuffer_emit_mi_flush(struct intel_batchbuffer *batch)
 246 {
 247    struct intel_context *intel = batch->intel;
 248
 249    if (intel->gen >= 4) {
 250       BEGIN_BATCH(4);
 251       OUT_BATCH(_3DSTATE_PIPE_CONTROL |
 252                 PIPE_CONTROL_INSTRUCTION_FLUSH |
 253                 PIPE_CONTROL_WRITE_FLUSH |
 254                 PIPE_CONTROL_NO_WRITE);
 255       OUT_BATCH(0); /* write address */
 256       OUT_BATCH(0); /* write data */
 257       OUT_BATCH(0); /* write data */
 258       ADVANCE_BATCH();
 259    } else {
 260       BEGIN_BATCH(1);
 261       OUT_BATCH(MI_FLUSH);
 262       ADVANCE_BATCH();
 263    }
 264 }