drivers/gpu/drm/etnaviv/etnaviv_buffer.c

   1 /*
   2  * Copyright (C) 2014 Etnaviv Project
   3  * Author: Christian Gmeiner <christian.gmeiner@gmail.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "etnaviv_cmdbuf.h"
  19 #include "etnaviv_gpu.h"
  20 #include "etnaviv_gem.h"
  21 #include "etnaviv_mmu.h"
  22
  23 #include "common.xml.h"
  24 #include "state.xml.h"
  25 #include "state_hi.xml.h"
  26 #include "state_3d.xml.h"
  27 #include "cmdstream.xml.h"
  28
  29 /*
  30  * Command Buffer helper:
  31  */
  32
  33
  34 static inline void OUT(struct etnaviv_cmdbuf *buffer, u32 data)
  35 {
  36         u32 *vaddr = (u32 *)buffer->vaddr;
  37
  38         BUG_ON(buffer->user_size >= buffer->size);
  39
  40         vaddr[buffer->user_size / 4] = data;
  41         buffer->user_size += 4;
  42 }
  43
  44 static inline void CMD_LOAD_STATE(struct etnaviv_cmdbuf *buffer,
  45         u32 reg, u32 value)
  46 {
  47         u32 index = reg >> VIV_FE_LOAD_STATE_HEADER_OFFSET__SHR;
  48
  49         buffer->user_size = ALIGN(buffer->user_size, 8);
  50
  51         /* write a register via cmd stream */
  52         OUT(buffer, VIV_FE_LOAD_STATE_HEADER_OP_LOAD_STATE |
  53                     VIV_FE_LOAD_STATE_HEADER_COUNT(1) |
  54                     VIV_FE_LOAD_STATE_HEADER_OFFSET(index));
  55         OUT(buffer, value);
  56 }
  57
  58 static inline void CMD_END(struct etnaviv_cmdbuf *buffer)
  59 {
  60         buffer->user_size = ALIGN(buffer->user_size, 8);
  61
  62         OUT(buffer, VIV_FE_END_HEADER_OP_END);
  63 }
  64
  65 static inline void CMD_WAIT(struct etnaviv_cmdbuf *buffer)
  66 {
  67         buffer->user_size = ALIGN(buffer->user_size, 8);
  68
  69         OUT(buffer, VIV_FE_WAIT_HEADER_OP_WAIT | 200);
  70 }
  71
  72 static inline void CMD_LINK(struct etnaviv_cmdbuf *buffer,
  73         u16 prefetch, u32 address)
  74 {
  75         buffer->user_size = ALIGN(buffer->user_size, 8);
  76
  77         OUT(buffer, VIV_FE_LINK_HEADER_OP_LINK |
  78                     VIV_FE_LINK_HEADER_PREFETCH(prefetch));
  79         OUT(buffer, address);
  80 }
  81
  82 static inline void CMD_STALL(struct etnaviv_cmdbuf *buffer,
  83         u32 from, u32 to)
  84 {
  85         buffer->user_size = ALIGN(buffer->user_size, 8);
  86
  87         OUT(buffer, VIV_FE_STALL_HEADER_OP_STALL);
  88         OUT(buffer, VIV_FE_STALL_TOKEN_FROM(from) | VIV_FE_STALL_TOKEN_TO(to));
  89 }
  90
  91 static inline void CMD_SEM(struct etnaviv_cmdbuf *buffer, u32 from, u32 to)
  92 {
  93         CMD_LOAD_STATE(buffer, VIVS_GL_SEMAPHORE_TOKEN,
  94                        VIVS_GL_SEMAPHORE_TOKEN_FROM(from) |
  95                        VIVS_GL_SEMAPHORE_TOKEN_TO(to));
  96 }
  97
  98 static void etnaviv_cmd_select_pipe(struct etnaviv_gpu *gpu,
  99         struct etnaviv_cmdbuf *buffer, u8 pipe)
 100 {
 101         u32 flush = 0;
 102
 103         /*
 104          * This assumes that if we're switching to 2D, we're switching
 105          * away from 3D, and vice versa.  Hence, if we're switching to
 106          * the 2D core, we need to flush the 3D depth and color caches,
 107          * otherwise we need to flush the 2D pixel engine cache.
 108          */
 109         if (gpu->exec_state == ETNA_PIPE_2D)
 110                 flush = VIVS_GL_FLUSH_CACHE_PE2D;
 111         else if (gpu->exec_state == ETNA_PIPE_3D)
 112                 flush = VIVS_GL_FLUSH_CACHE_DEPTH | VIVS_GL_FLUSH_CACHE_COLOR;
 113
 114         CMD_LOAD_STATE(buffer, VIVS_GL_FLUSH_CACHE, flush);
 115         CMD_SEM(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 116         CMD_STALL(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 117
 118         CMD_LOAD_STATE(buffer, VIVS_GL_PIPE_SELECT,
 119                        VIVS_GL_PIPE_SELECT_PIPE(pipe));
 120 }
 121
 122 static void etnaviv_buffer_dump(struct etnaviv_gpu *gpu,
 123         struct etnaviv_cmdbuf *buf, u32 off, u32 len)
 124 {
 125         u32 size = buf->size;
 126         u32 *ptr = buf->vaddr + off;
 127
 128         dev_info(gpu->dev, "virt %p phys 0x%08x free 0x%08x\n",
 129                         ptr, etnaviv_cmdbuf_get_va(buf) + off, size - len * 4 - off);
 130
 131         print_hex_dump(KERN_INFO, "cmd ", DUMP_PREFIX_OFFSET, 16, 4,
 132                         ptr, len * 4, 0);
 133 }
 134
 135 /*
 136  * Safely replace the WAIT of a waitlink with a new command and argument.
 137  * The GPU may be executing this WAIT while we're modifying it, so we have
 138  * to write it in a specific order to avoid the GPU branching to somewhere
 139  * else.  'wl_offset' is the offset to the first byte of the WAIT command.
 140  */
 141 static void etnaviv_buffer_replace_wait(struct etnaviv_cmdbuf *buffer,
 142         unsigned int wl_offset, u32 cmd, u32 arg)
 143 {
 144         u32 *lw = buffer->vaddr + wl_offset;
 145
 146         lw[1] = arg;
 147         mb();
 148         lw[0] = cmd;
 149         mb();
 150 }
 151
 152 /*
 153  * Ensure that there is space in the command buffer to contiguously write
 154  * 'cmd_dwords' 64-bit words into the buffer, wrapping if necessary.
 155  */
 156 static u32 etnaviv_buffer_reserve(struct etnaviv_gpu *gpu,
 157         struct etnaviv_cmdbuf *buffer, unsigned int cmd_dwords)
 158 {
 159         if (buffer->user_size + cmd_dwords * sizeof(u64) > buffer->size)
 160                 buffer->user_size = 0;
 161
 162         return etnaviv_cmdbuf_get_va(buffer) + buffer->user_size;
 163 }
 164
 165 u16 etnaviv_buffer_init(struct etnaviv_gpu *gpu)
 166 {
 167         struct etnaviv_cmdbuf *buffer = gpu->buffer;
 168
 169         /* initialize buffer */
 170         buffer->user_size = 0;
 171
 172         CMD_WAIT(buffer);
 173         CMD_LINK(buffer, 2, etnaviv_cmdbuf_get_va(buffer) +
 174                  buffer->user_size - 4);
 175
 176         return buffer->user_size / 8;
 177 }
 178
 179 u16 etnaviv_buffer_config_mmuv2(struct etnaviv_gpu *gpu, u32 mtlb_addr, u32 safe_addr)
 180 {
 181         struct etnaviv_cmdbuf *buffer = gpu->buffer;
 182
 183         buffer->user_size = 0;
 184
 185         if (gpu->identity.features & chipFeatures_PIPE_3D) {
 186                 CMD_LOAD_STATE(buffer, VIVS_GL_PIPE_SELECT,
 187                                VIVS_GL_PIPE_SELECT_PIPE(ETNA_PIPE_3D));
 188                 CMD_LOAD_STATE(buffer, VIVS_MMUv2_CONFIGURATION,
 189                         mtlb_addr | VIVS_MMUv2_CONFIGURATION_MODE_MODE4_K);
 190                 CMD_LOAD_STATE(buffer, VIVS_MMUv2_SAFE_ADDRESS, safe_addr);
 191                 CMD_SEM(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 192                 CMD_STALL(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 193         }
 194
 195         if (gpu->identity.features & chipFeatures_PIPE_2D) {
 196                 CMD_LOAD_STATE(buffer, VIVS_GL_PIPE_SELECT,
 197                                VIVS_GL_PIPE_SELECT_PIPE(ETNA_PIPE_2D));
 198                 CMD_LOAD_STATE(buffer, VIVS_MMUv2_CONFIGURATION,
 199                         mtlb_addr | VIVS_MMUv2_CONFIGURATION_MODE_MODE4_K);
 200                 CMD_LOAD_STATE(buffer, VIVS_MMUv2_SAFE_ADDRESS, safe_addr);
 201                 CMD_SEM(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 202                 CMD_STALL(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 203         }
 204
 205         CMD_END(buffer);
 206
 207         buffer->user_size = ALIGN(buffer->user_size, 8);
 208
 209         return buffer->user_size / 8;
 210 }
 211
 212 void etnaviv_buffer_end(struct etnaviv_gpu *gpu)
 213 {
 214         struct etnaviv_cmdbuf *buffer = gpu->buffer;
 215         unsigned int waitlink_offset = buffer->user_size - 16;
 216         u32 link_target, flush = 0;
 217
 218         if (gpu->exec_state == ETNA_PIPE_2D)
 219                 flush = VIVS_GL_FLUSH_CACHE_PE2D;
 220         else if (gpu->exec_state == ETNA_PIPE_3D)
 221                 flush = VIVS_GL_FLUSH_CACHE_DEPTH |
 222                         VIVS_GL_FLUSH_CACHE_COLOR |
 223                         VIVS_GL_FLUSH_CACHE_TEXTURE |
 224                         VIVS_GL_FLUSH_CACHE_TEXTUREVS |
 225                         VIVS_GL_FLUSH_CACHE_SHADER_L2;
 226
 227         if (flush) {
 228                 unsigned int dwords = 7;
 229
 230                 link_target = etnaviv_buffer_reserve(gpu, buffer, dwords);
 231
 232                 CMD_SEM(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 233                 CMD_STALL(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 234                 CMD_LOAD_STATE(buffer, VIVS_GL_FLUSH_CACHE, flush);
 235                 if (gpu->exec_state == ETNA_PIPE_3D)
 236                         CMD_LOAD_STATE(buffer, VIVS_TS_FLUSH_CACHE,
 237                                        VIVS_TS_FLUSH_CACHE_FLUSH);
 238                 CMD_SEM(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 239                 CMD_STALL(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 240                 CMD_END(buffer);
 241
 242                 etnaviv_buffer_replace_wait(buffer, waitlink_offset,
 243                                             VIV_FE_LINK_HEADER_OP_LINK |
 244                                             VIV_FE_LINK_HEADER_PREFETCH(dwords),
 245                                             link_target);
 246         } else {
 247                 /* Replace the last link-wait with an "END" command */
 248                 etnaviv_buffer_replace_wait(buffer, waitlink_offset,
 249                                             VIV_FE_END_HEADER_OP_END, 0);
 250         }
 251 }
 252
 253 /* Append a command buffer to the ring buffer. */
 254 void etnaviv_buffer_queue(struct etnaviv_gpu *gpu, unsigned int event,
 255         struct etnaviv_cmdbuf *cmdbuf)
 256 {
 257         struct etnaviv_cmdbuf *buffer = gpu->buffer;
 258         unsigned int waitlink_offset = buffer->user_size - 16;
 259         u32 return_target, return_dwords;
 260         u32 link_target, link_dwords;
 261         unsigned int new_flush_seq = READ_ONCE(gpu->mmu->flush_seq);
 262         bool need_flush = gpu->flush_seq != new_flush_seq;
 263
 264         if (drm_debug & DRM_UT_DRIVER)
 265                 etnaviv_buffer_dump(gpu, buffer, 0, 0x50);
 266
 267         link_target = etnaviv_cmdbuf_get_va(cmdbuf);
 268         link_dwords = cmdbuf->size / 8;
 269
 270         /*
 271          * If we need maintanence prior to submitting this buffer, we will
 272          * need to append a mmu flush load state, followed by a new
 273          * link to this buffer - a total of four additional words.
 274          */
 275         if (need_flush || gpu->switch_context) {
 276                 u32 target, extra_dwords;
 277
 278                 /* link command */
 279                 extra_dwords = 1;
 280
 281                 /* flush command */
 282                 if (need_flush) {
 283                         if (gpu->mmu->version == ETNAVIV_IOMMU_V1)
 284                                 extra_dwords += 1;
 285                         else
 286                                 extra_dwords += 3;
 287                 }
 288
 289                 /* pipe switch commands */
 290                 if (gpu->switch_context)
 291                         extra_dwords += 4;
 292
 293                 target = etnaviv_buffer_reserve(gpu, buffer, extra_dwords);
 294
 295                 if (need_flush) {
 296                         /* Add the MMU flush */
 297                         if (gpu->mmu->version == ETNAVIV_IOMMU_V1) {
 298                                 CMD_LOAD_STATE(buffer, VIVS_GL_FLUSH_MMU,
 299                                                VIVS_GL_FLUSH_MMU_FLUSH_FEMMU |
 300                                                VIVS_GL_FLUSH_MMU_FLUSH_UNK1 |
 301                                                VIVS_GL_FLUSH_MMU_FLUSH_UNK2 |
 302                                                VIVS_GL_FLUSH_MMU_FLUSH_PEMMU |
 303                                                VIVS_GL_FLUSH_MMU_FLUSH_UNK4);
 304                         } else {
 305                                 CMD_LOAD_STATE(buffer, VIVS_MMUv2_CONFIGURATION,
 306                                         VIVS_MMUv2_CONFIGURATION_MODE_MASK |
 307                                         VIVS_MMUv2_CONFIGURATION_ADDRESS_MASK |
 308                                         VIVS_MMUv2_CONFIGURATION_FLUSH_FLUSH);
 309                                 CMD_SEM(buffer, SYNC_RECIPIENT_FE,
 310                                         SYNC_RECIPIENT_PE);
 311                                 CMD_STALL(buffer, SYNC_RECIPIENT_FE,
 312                                         SYNC_RECIPIENT_PE);
 313                         }
 314
 315                         gpu->flush_seq = new_flush_seq;
 316                 }
 317
 318                 if (gpu->switch_context) {
 319                         etnaviv_cmd_select_pipe(gpu, buffer, cmdbuf->exec_state);
 320                         gpu->exec_state = cmdbuf->exec_state;
 321                         gpu->switch_context = false;
 322                 }
 323
 324                 /* And the link to the submitted buffer */
 325                 CMD_LINK(buffer, link_dwords, link_target);
 326
 327                 /* Update the link target to point to above instructions */
 328                 link_target = target;
 329                 link_dwords = extra_dwords;
 330         }
 331
 332         /*
 333          * Append a LINK to the submitted command buffer to return to
 334          * the ring buffer.  return_target is the ring target address.
 335          * We need at most 7 dwords in the return target: 2 cache flush +
 336          * 2 semaphore stall + 1 event + 1 wait + 1 link.
 337          */
 338         return_dwords = 7;
 339         return_target = etnaviv_buffer_reserve(gpu, buffer, return_dwords);
 340         CMD_LINK(cmdbuf, return_dwords, return_target);
 341
 342         /*
 343          * Append a cache flush, stall, event, wait and link pointing back to
 344          * the wait command to the ring buffer.
 345          */
 346         if (gpu->exec_state == ETNA_PIPE_2D) {
 347                 CMD_LOAD_STATE(buffer, VIVS_GL_FLUSH_CACHE,
 348                                        VIVS_GL_FLUSH_CACHE_PE2D);
 349         } else {
 350                 CMD_LOAD_STATE(buffer, VIVS_GL_FLUSH_CACHE,
 351                                        VIVS_GL_FLUSH_CACHE_DEPTH |
 352                                        VIVS_GL_FLUSH_CACHE_COLOR);
 353                 CMD_LOAD_STATE(buffer, VIVS_TS_FLUSH_CACHE,
 354                                        VIVS_TS_FLUSH_CACHE_FLUSH);
 355         }
 356         CMD_SEM(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 357         CMD_STALL(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 358         CMD_LOAD_STATE(buffer, VIVS_GL_EVENT, VIVS_GL_EVENT_EVENT_ID(event) |
 359                        VIVS_GL_EVENT_FROM_PE);
 360         CMD_WAIT(buffer);
 361         CMD_LINK(buffer, 2, etnaviv_cmdbuf_get_va(buffer) +
 362                             buffer->user_size - 4);
 363
 364         if (drm_debug & DRM_UT_DRIVER)
 365                 pr_info("stream link to 0x%08x @ 0x%08x %p\n",
 366                         return_target, etnaviv_cmdbuf_get_va(cmdbuf),
 367                         cmdbuf->vaddr);
 368
 369         if (drm_debug & DRM_UT_DRIVER) {
 370                 print_hex_dump(KERN_INFO, "cmd ", DUMP_PREFIX_OFFSET, 16, 4,
 371                                cmdbuf->vaddr, cmdbuf->size, 0);
 372
 373                 pr_info("link op: %p\n", buffer->vaddr + waitlink_offset);
 374                 pr_info("addr: 0x%08x\n", link_target);
 375                 pr_info("back: 0x%08x\n", return_target);
 376                 pr_info("event: %d\n", event);
 377         }
 378
 379         /*
 380          * Kick off the submitted command by replacing the previous
 381          * WAIT with a link to the address in the ring buffer.
 382          */
 383         etnaviv_buffer_replace_wait(buffer, waitlink_offset,
 384                                     VIV_FE_LINK_HEADER_OP_LINK |
 385                                     VIV_FE_LINK_HEADER_PREFETCH(link_dwords),
 386                                     link_target);
 387
 388         if (drm_debug & DRM_UT_DRIVER)
 389                 etnaviv_buffer_dump(gpu, buffer, 0, 0x50);
 390 }