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_gpu.h"
  19 #include "etnaviv_gem.h"
  20 #include "etnaviv_mmu.h"
  21
  22 #include "common.xml.h"
  23 #include "state.xml.h"
  24 #include "state_3d.xml.h"
  25 #include "cmdstream.xml.h"
  26
  27 /*
  28  * Command Buffer helper:
  29  */
  30
  31
  32 static inline void OUT(struct etnaviv_cmdbuf *buffer, u32 data)
  33 {
  34         u32 *vaddr = (u32 *)buffer->vaddr;
  35
  36         BUG_ON(buffer->user_size >= buffer->size);
  37
  38         vaddr[buffer->user_size / 4] = data;
  39         buffer->user_size += 4;
  40 }
  41
  42 static inline void CMD_LOAD_STATE(struct etnaviv_cmdbuf *buffer,
  43         u32 reg, u32 value)
  44 {
  45         u32 index = reg >> VIV_FE_LOAD_STATE_HEADER_OFFSET__SHR;
  46
  47         buffer->user_size = ALIGN(buffer->user_size, 8);
  48
  49         /* write a register via cmd stream */
  50         OUT(buffer, VIV_FE_LOAD_STATE_HEADER_OP_LOAD_STATE |
  51                     VIV_FE_LOAD_STATE_HEADER_COUNT(1) |
  52                     VIV_FE_LOAD_STATE_HEADER_OFFSET(index));
  53         OUT(buffer, value);
  54 }
  55
  56 static inline void CMD_END(struct etnaviv_cmdbuf *buffer)
  57 {
  58         buffer->user_size = ALIGN(buffer->user_size, 8);
  59
  60         OUT(buffer, VIV_FE_END_HEADER_OP_END);
  61 }
  62
  63 static inline void CMD_WAIT(struct etnaviv_cmdbuf *buffer)
  64 {
  65         buffer->user_size = ALIGN(buffer->user_size, 8);
  66
  67         OUT(buffer, VIV_FE_WAIT_HEADER_OP_WAIT | 200);
  68 }
  69
  70 static inline void CMD_LINK(struct etnaviv_cmdbuf *buffer,
  71         u16 prefetch, u32 address)
  72 {
  73         buffer->user_size = ALIGN(buffer->user_size, 8);
  74
  75         OUT(buffer, VIV_FE_LINK_HEADER_OP_LINK |
  76                     VIV_FE_LINK_HEADER_PREFETCH(prefetch));
  77         OUT(buffer, address);
  78 }
  79
  80 static inline void CMD_STALL(struct etnaviv_cmdbuf *buffer,
  81         u32 from, u32 to)
  82 {
  83         buffer->user_size = ALIGN(buffer->user_size, 8);
  84
  85         OUT(buffer, VIV_FE_STALL_HEADER_OP_STALL);
  86         OUT(buffer, VIV_FE_STALL_TOKEN_FROM(from) | VIV_FE_STALL_TOKEN_TO(to));
  87 }
  88
  89 static inline void CMD_SEM(struct etnaviv_cmdbuf *buffer, u32 from, u32 to)
  90 {
  91         CMD_LOAD_STATE(buffer, VIVS_GL_SEMAPHORE_TOKEN,
  92                        VIVS_GL_SEMAPHORE_TOKEN_FROM(from) |
  93                        VIVS_GL_SEMAPHORE_TOKEN_TO(to));
  94 }
  95
  96 static void etnaviv_cmd_select_pipe(struct etnaviv_gpu *gpu,
  97         struct etnaviv_cmdbuf *buffer, u8 pipe)
  98 {
  99         u32 flush = 0;
 100
 101         /*
 102          * This assumes that if we're switching to 2D, we're switching
 103          * away from 3D, and vice versa.  Hence, if we're switching to
 104          * the 2D core, we need to flush the 3D depth and color caches,
 105          * otherwise we need to flush the 2D pixel engine cache.
 106          */
 107         if (gpu->exec_state == ETNA_PIPE_2D)
 108                 flush = VIVS_GL_FLUSH_CACHE_PE2D;
 109         else if (gpu->exec_state == ETNA_PIPE_3D)
 110                 flush = VIVS_GL_FLUSH_CACHE_DEPTH | VIVS_GL_FLUSH_CACHE_COLOR;
 111
 112         CMD_LOAD_STATE(buffer, VIVS_GL_FLUSH_CACHE, flush);
 113         CMD_SEM(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 114         CMD_STALL(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 115
 116         CMD_LOAD_STATE(buffer, VIVS_GL_PIPE_SELECT,
 117                        VIVS_GL_PIPE_SELECT_PIPE(pipe));
 118 }
 119
 120 static u32 gpu_va(struct etnaviv_gpu *gpu, struct etnaviv_cmdbuf *buf)
 121 {
 122         return buf->paddr - gpu->memory_base;
 123 }
 124
 125 static void etnaviv_buffer_dump(struct etnaviv_gpu *gpu,
 126         struct etnaviv_cmdbuf *buf, u32 off, u32 len)
 127 {
 128         u32 size = buf->size;
 129         u32 *ptr = buf->vaddr + off;
 130
 131         dev_info(gpu->dev, "virt %p phys 0x%08x free 0x%08x\n",
 132                         ptr, gpu_va(gpu, buf) + off, size - len * 4 - off);
 133
 134         print_hex_dump(KERN_INFO, "cmd ", DUMP_PREFIX_OFFSET, 16, 4,
 135                         ptr, len * 4, 0);
 136 }
 137
 138 /*
 139  * Safely replace the WAIT of a waitlink with a new command and argument.
 140  * The GPU may be executing this WAIT while we're modifying it, so we have
 141  * to write it in a specific order to avoid the GPU branching to somewhere
 142  * else.  'wl_offset' is the offset to the first byte of the WAIT command.
 143  */
 144 static void etnaviv_buffer_replace_wait(struct etnaviv_cmdbuf *buffer,
 145         unsigned int wl_offset, u32 cmd, u32 arg)
 146 {
 147         u32 *lw = buffer->vaddr + wl_offset;
 148
 149         lw[1] = arg;
 150         mb();
 151         lw[0] = cmd;
 152         mb();
 153 }
 154
 155 /*
 156  * Ensure that there is space in the command buffer to contiguously write
 157  * 'cmd_dwords' 64-bit words into the buffer, wrapping if necessary.
 158  */
 159 static u32 etnaviv_buffer_reserve(struct etnaviv_gpu *gpu,
 160         struct etnaviv_cmdbuf *buffer, unsigned int cmd_dwords)
 161 {
 162         if (buffer->user_size + cmd_dwords * sizeof(u64) > buffer->size)
 163                 buffer->user_size = 0;
 164
 165         return gpu_va(gpu, buffer) + buffer->user_size;
 166 }
 167
 168 u16 etnaviv_buffer_init(struct etnaviv_gpu *gpu)
 169 {
 170         struct etnaviv_cmdbuf *buffer = gpu->buffer;
 171
 172         /* initialize buffer */
 173         buffer->user_size = 0;
 174
 175         CMD_WAIT(buffer);
 176         CMD_LINK(buffer, 2, gpu_va(gpu, buffer) + buffer->user_size - 4);
 177
 178         return buffer->user_size / 8;
 179 }
 180
 181 void etnaviv_buffer_end(struct etnaviv_gpu *gpu)
 182 {
 183         struct etnaviv_cmdbuf *buffer = gpu->buffer;
 184         unsigned int waitlink_offset = buffer->user_size - 16;
 185         u32 link_target, flush = 0;
 186
 187         if (gpu->exec_state == ETNA_PIPE_2D)
 188                 flush = VIVS_GL_FLUSH_CACHE_PE2D;
 189         else if (gpu->exec_state == ETNA_PIPE_3D)
 190                 flush = VIVS_GL_FLUSH_CACHE_DEPTH |
 191                         VIVS_GL_FLUSH_CACHE_COLOR |
 192                         VIVS_GL_FLUSH_CACHE_TEXTURE |
 193                         VIVS_GL_FLUSH_CACHE_TEXTUREVS |
 194                         VIVS_GL_FLUSH_CACHE_SHADER_L2;
 195
 196         if (flush) {
 197                 unsigned int dwords = 7;
 198
 199                 link_target = etnaviv_buffer_reserve(gpu, buffer, dwords);
 200
 201                 CMD_SEM(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 202                 CMD_STALL(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 203                 CMD_LOAD_STATE(buffer, VIVS_GL_FLUSH_CACHE, flush);
 204                 if (gpu->exec_state == ETNA_PIPE_3D)
 205                         CMD_LOAD_STATE(buffer, VIVS_TS_FLUSH_CACHE,
 206                                        VIVS_TS_FLUSH_CACHE_FLUSH);
 207                 CMD_SEM(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 208                 CMD_STALL(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 209                 CMD_END(buffer);
 210
 211                 etnaviv_buffer_replace_wait(buffer, waitlink_offset,
 212                                             VIV_FE_LINK_HEADER_OP_LINK |
 213                                             VIV_FE_LINK_HEADER_PREFETCH(dwords),
 214                                             link_target);
 215         } else {
 216                 /* Replace the last link-wait with an "END" command */
 217                 etnaviv_buffer_replace_wait(buffer, waitlink_offset,
 218                                             VIV_FE_END_HEADER_OP_END, 0);
 219         }
 220 }
 221
 222 /* Append a command buffer to the ring buffer. */
 223 void etnaviv_buffer_queue(struct etnaviv_gpu *gpu, unsigned int event,
 224         struct etnaviv_cmdbuf *cmdbuf)
 225 {
 226         struct etnaviv_cmdbuf *buffer = gpu->buffer;
 227         unsigned int waitlink_offset = buffer->user_size - 16;
 228         u32 return_target, return_dwords;
 229         u32 link_target, link_dwords;
 230
 231         if (drm_debug & DRM_UT_DRIVER)
 232                 etnaviv_buffer_dump(gpu, buffer, 0, 0x50);
 233
 234         link_target = gpu_va(gpu, cmdbuf);
 235         link_dwords = cmdbuf->size / 8;
 236
 237         /*
 238          * If we need maintanence prior to submitting this buffer, we will
 239          * need to append a mmu flush load state, followed by a new
 240          * link to this buffer - a total of four additional words.
 241          */
 242         if (gpu->mmu->need_flush || gpu->switch_context) {
 243                 u32 target, extra_dwords;
 244
 245                 /* link command */
 246                 extra_dwords = 1;
 247
 248                 /* flush command */
 249                 if (gpu->mmu->need_flush)
 250                         extra_dwords += 1;
 251
 252                 /* pipe switch commands */
 253                 if (gpu->switch_context)
 254                         extra_dwords += 4;
 255
 256                 target = etnaviv_buffer_reserve(gpu, buffer, extra_dwords);
 257
 258                 if (gpu->mmu->need_flush) {
 259                         /* Add the MMU flush */
 260                         CMD_LOAD_STATE(buffer, VIVS_GL_FLUSH_MMU,
 261                                        VIVS_GL_FLUSH_MMU_FLUSH_FEMMU |
 262                                        VIVS_GL_FLUSH_MMU_FLUSH_UNK1 |
 263                                        VIVS_GL_FLUSH_MMU_FLUSH_UNK2 |
 264                                        VIVS_GL_FLUSH_MMU_FLUSH_PEMMU |
 265                                        VIVS_GL_FLUSH_MMU_FLUSH_UNK4);
 266
 267                         gpu->mmu->need_flush = false;
 268                 }
 269
 270                 if (gpu->switch_context) {
 271                         etnaviv_cmd_select_pipe(gpu, buffer, cmdbuf->exec_state);
 272                         gpu->exec_state = cmdbuf->exec_state;
 273                         gpu->switch_context = false;
 274                 }
 275
 276                 /* And the link to the submitted buffer */
 277                 CMD_LINK(buffer, link_dwords, link_target);
 278
 279                 /* Update the link target to point to above instructions */
 280                 link_target = target;
 281                 link_dwords = extra_dwords;
 282         }
 283
 284         /*
 285          * Append a LINK to the submitted command buffer to return to
 286          * the ring buffer.  return_target is the ring target address.
 287          * We need three dwords: event, wait, link.
 288          */
 289         return_dwords = 3;
 290         return_target = etnaviv_buffer_reserve(gpu, buffer, return_dwords);
 291         CMD_LINK(cmdbuf, return_dwords, return_target);
 292
 293         /*
 294          * Append event, wait and link pointing back to the wait
 295          * command to the ring buffer.
 296          */
 297         CMD_LOAD_STATE(buffer, VIVS_GL_EVENT, VIVS_GL_EVENT_EVENT_ID(event) |
 298                        VIVS_GL_EVENT_FROM_PE);
 299         CMD_WAIT(buffer);
 300         CMD_LINK(buffer, 2, return_target + 8);
 301
 302         if (drm_debug & DRM_UT_DRIVER)
 303                 pr_info("stream link to 0x%08x @ 0x%08x %p\n",
 304                         return_target, gpu_va(gpu, cmdbuf), cmdbuf->vaddr);
 305
 306         if (drm_debug & DRM_UT_DRIVER) {
 307                 print_hex_dump(KERN_INFO, "cmd ", DUMP_PREFIX_OFFSET, 16, 4,
 308                                cmdbuf->vaddr, cmdbuf->size, 0);
 309
 310                 pr_info("link op: %p\n", buffer->vaddr + waitlink_offset);
 311                 pr_info("addr: 0x%08x\n", link_target);
 312                 pr_info("back: 0x%08x\n", return_target);
 313                 pr_info("event: %d\n", event);
 314         }
 315
 316         /*
 317          * Kick off the submitted command by replacing the previous
 318          * WAIT with a link to the address in the ring buffer.
 319          */
 320         etnaviv_buffer_replace_wait(buffer, waitlink_offset,
 321                                     VIV_FE_LINK_HEADER_OP_LINK |
 322                                     VIV_FE_LINK_HEADER_PREFETCH(link_dwords),
 323                                     link_target);
 324
 325         if (drm_debug & DRM_UT_DRIVER)
 326                 etnaviv_buffer_dump(gpu, buffer, 0, 0x50);
 327 }