src/gallium/drivers/freedreno/freedreno_gmem.c

   1 /* -*- mode: C; c-file-style: "k&r"; tab-width 4; indent-tabs-mode: t; -*- */
   2
   3 /*
   4  * Copyright (C) 2012 Rob Clark <robclark@freedesktop.org>
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the next
  14  * paragraph) shall be included in all copies or substantial portions of the
  15  * Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23  * SOFTWARE.
  24  *
  25  * Authors:
  26  *    Rob Clark <robclark@freedesktop.org>
  27  */
  28
  29 #include "pipe/p_state.h"
  30 #include "util/u_string.h"
  31 #include "util/u_memory.h"
  32 #include "util/u_inlines.h"
  33 #include "util/u_format.h"
  34
  35 #include "freedreno_gmem.h"
  36 #include "freedreno_context.h"
  37 #include "freedreno_resource.h"
  38 #include "freedreno_util.h"
  39
  40 /*
  41  * GMEM is the small (ie. 256KiB for a200, 512KiB for a220, etc) tile buffer
  42  * inside the GPU.  All rendering happens to GMEM.  Larger render targets
  43  * are split into tiles that are small enough for the color (and depth and/or
  44  * stencil, if enabled) buffers to fit within GMEM.  Before rendering a tile,
  45  * if there was not a clear invalidating the previous tile contents, we need
  46  * to restore the previous tiles contents (system mem -> GMEM), and after all
  47  * the draw calls, before moving to the next tile, we need to save the tile
  48  * contents (GMEM -> system mem).
  49  *
  50  * The code in this file handles dealing with GMEM and tiling.
  51  *
  52  * The structure of the ringbuffer ends up being:
  53  *
  54  *     +--<---<-- IB ---<---+---<---+---<---<---<--+
  55  *     |                    |       |              |
  56  *     v                    ^       ^              ^
  57  *   ------------------------------------------------------
  58  *     | clear/draw cmds | Tile0 | Tile1 | .... | TileN |
  59  *   ------------------------------------------------------
  60  *                       ^
  61  *                       |
  62  *                       address submitted in issueibcmds
  63  *
  64  * Where the per-tile section handles scissor setup, mem2gmem restore (if
  65  * needed), IB to draw cmds earlier in the ringbuffer, and then gmem2mem
  66  * resolve.
  67  */
  68
  69 static void
  70 calculate_tiles(struct fd_context *ctx)
  71 {
  72         struct fd_gmem_stateobj *gmem = &ctx->gmem;
  73         struct pipe_scissor_state *scissor = &ctx->max_scissor;
  74         struct pipe_framebuffer_state *pfb = &ctx->framebuffer;
  75         uint32_t cpp = util_format_get_blocksize(pfb->cbufs[0]->format);
  76         uint32_t gmem_size = ctx->screen->gmemsize_bytes;
  77         uint32_t minx, miny, width, height;
  78         uint32_t nbins_x = 1, nbins_y = 1;
  79         uint32_t bin_w, bin_h;
  80         uint32_t max_width = 992;
  81
  82         if ((gmem->cpp == cpp) &&
  83                         !memcmp(&gmem->scissor, scissor, sizeof(gmem->scissor))) {
  84                 /* everything is up-to-date */
  85                 return;
  86         }
  87
  88         if (fd_mesa_debug & FD_DBG_DSCIS) {
  89                 minx = 0;
  90                 miny = 0;
  91                 width = pfb->width;
  92                 height = pfb->height;
  93         } else {
  94                 minx = scissor->minx & ~31; /* round down to multiple of 32 */
  95                 miny = scissor->miny & ~31;
  96                 width = scissor->maxx - minx;
  97                 height = scissor->maxy - miny;
  98         }
  99
 100 // TODO we probably could optimize this a bit if we know that
 101 // Z or stencil is not enabled for any of the draw calls..
 102 //      if (fd_stencil_enabled(ctx->zsa) || fd_depth_enabled(ctx->zsa)) {
 103                 gmem_size /= 2;
 104                 max_width = 256;
 105 //      }
 106
 107         bin_w = align(width, 32);
 108         bin_h = align(height, 32);
 109
 110         /* first, find a bin width that satisfies the maximum width
 111          * restrictions:
 112          */
 113         while (bin_w > max_width) {
 114                 nbins_x++;
 115                 bin_w = align(width / nbins_x, 32);
 116         }
 117
 118         /* then find a bin height that satisfies the memory constraints:
 119          */
 120         while ((bin_w * bin_h * cpp) > gmem_size) {
 121                 nbins_y++;
 122                 bin_h = align(height / nbins_y, 32);
 123         }
 124
 125         DBG("using %d bins of size %dx%d", nbins_x*nbins_y, bin_w, bin_h);
 126
 127         gmem->scissor = *scissor;
 128         gmem->cpp = cpp;
 129         gmem->minx = minx;
 130         gmem->miny = miny;
 131         gmem->bin_h = bin_h;
 132         gmem->bin_w = bin_w;
 133         gmem->nbins_x = nbins_x;
 134         gmem->nbins_y = nbins_y;
 135         gmem->width = width;
 136         gmem->height = height;
 137 }
 138
 139 static void
 140 render_tiles(struct fd_context *ctx)
 141 {
 142         struct fd_gmem_stateobj *gmem = &ctx->gmem;
 143         uint32_t i, yoff = gmem->miny;
 144
 145         ctx->emit_tile_init(ctx);
 146
 147         for (i = 0; i < gmem->nbins_y; i++) {
 148                 uint32_t j, xoff = gmem->minx;
 149                 uint32_t bh = gmem->bin_h;
 150
 151                 /* clip bin height: */
 152                 bh = MIN2(bh, gmem->miny + gmem->height - yoff);
 153
 154                 for (j = 0; j < gmem->nbins_x; j++) {
 155                         uint32_t bw = gmem->bin_w;
 156
 157                         /* clip bin width: */
 158                         bw = MIN2(bw, gmem->minx + gmem->width - xoff);
 159
 160                         DBG("bin_h=%d, yoff=%d, bin_w=%d, xoff=%d",
 161                                         bh, yoff, bw, xoff);
 162
 163                         ctx->emit_tile_prep(ctx, xoff, yoff, bw, bh);
 164
 165                         if (ctx->restore)
 166                                 ctx->emit_tile_mem2gmem(ctx, xoff, yoff, bw, bh);
 167
 168                         ctx->emit_tile_renderprep(ctx, xoff, yoff, bw, bh);
 169
 170                         /* emit IB to drawcmds: */
 171                         OUT_IB(ctx->ring, ctx->draw_start, ctx->draw_end);
 172
 173                         /* emit gmem2mem to transfer tile back to system memory: */
 174                         ctx->emit_tile_gmem2mem(ctx, xoff, yoff, bw, bh);
 175
 176                         xoff += bw;
 177                 }
 178
 179                 yoff += bh;
 180         }
 181 }
 182
 183 static void
 184 render_sysmem(struct fd_context *ctx)
 185 {
 186         ctx->emit_sysmem_prep(ctx);
 187
 188         /* emit IB to drawcmds: */
 189         OUT_IB(ctx->ring, ctx->draw_start, ctx->draw_end);
 190 }
 191
 192 void
 193 fd_gmem_render_tiles(struct pipe_context *pctx)
 194 {
 195         struct fd_context *ctx = fd_context(pctx);
 196         struct pipe_framebuffer_state *pfb = &ctx->framebuffer;
 197         uint32_t timestamp = 0;
 198         bool sysmem = false;
 199
 200         if (ctx->emit_sysmem_prep) {
 201                 if (ctx->cleared || ctx->gmem_reason || (ctx->num_draws > 5)) {
 202                         DBG("GMEM: cleared=%x, gmem_reason=%x, num_draws=%u",
 203                                 ctx->cleared, ctx->gmem_reason, ctx->num_draws);
 204                 } else {
 205                         sysmem = true;
 206                 }
 207         }
 208
 209         /* mark the end of the clear/draw cmds before emitting per-tile cmds: */
 210         fd_ringmarker_mark(ctx->draw_end);
 211
 212         if (sysmem) {
 213                 DBG("rendering sysmem (%s/%s)",
 214                         util_format_name(pfb->cbufs[0]->format),
 215                         pfb->zsbuf ? util_format_name(pfb->zsbuf->format) : "none");
 216                 render_sysmem(ctx);
 217         } else {
 218                 struct fd_gmem_stateobj *gmem = &ctx->gmem;
 219                 DBG("rendering %dx%d tiles (%s/%s)", gmem->nbins_x, gmem->nbins_y,
 220                         util_format_name(pfb->cbufs[0]->format),
 221                         pfb->zsbuf ? util_format_name(pfb->zsbuf->format) : "none");
 222                 calculate_tiles(ctx);
 223                 render_tiles(ctx);
 224         }
 225
 226         /* GPU executes starting from tile cmds, which IB back to draw cmds: */
 227         fd_ringmarker_flush(ctx->draw_end);
 228
 229         /* mark start for next draw cmds: */
 230         fd_ringmarker_mark(ctx->draw_start);
 231
 232         /* update timestamps on render targets: */
 233         timestamp = fd_ringbuffer_timestamp(ctx->ring);
 234         fd_resource(pfb->cbufs[0]->texture)->timestamp = timestamp;
 235         if (pfb->zsbuf)
 236                 fd_resource(pfb->zsbuf->texture)->timestamp = timestamp;
 237
 238         /* reset maximal bounds: */
 239         ctx->max_scissor.minx = ctx->max_scissor.miny = ~0;
 240         ctx->max_scissor.maxx = ctx->max_scissor.maxy = 0;
 241
 242         /* Note that because the per-tile setup and mem2gmem/gmem2mem are emitted
 243          * after the draw/clear calls, but executed before, we need to preemptively
 244          * flag some state as dirty before the first draw/clear call.
 245          *
 246          * TODO maybe we need to mark all state as dirty to not worry about state
 247          * being clobbered by other contexts?
 248          */
 249         ctx->dirty |= FD_DIRTY_ZSA |
 250                         FD_DIRTY_RASTERIZER |
 251                         FD_DIRTY_FRAMEBUFFER |
 252                         FD_DIRTY_SAMPLE_MASK |
 253                         FD_DIRTY_VIEWPORT |
 254                         FD_DIRTY_CONSTBUF |
 255                         FD_DIRTY_PROG |
 256                         FD_DIRTY_SCISSOR |
 257                         /* probably only needed if we need to mem2gmem on the next
 258                          * draw..  but not sure if there is a good way to know?
 259                          */
 260                         FD_DIRTY_VERTTEX |
 261                         FD_DIRTY_FRAGTEX |
 262                         FD_DIRTY_BLEND;
 263
 264         if (fd_mesa_debug & FD_DBG_DGMEM)
 265                 ctx->dirty = 0xffffffff;
 266 }