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 "cmdstream.xml.h"
  25
  26 /*
  27  * Command Buffer helper:
  28  */
  29
  30
  31 static inline void OUT(struct etnaviv_cmdbuf *buffer, u32 data)
  32 {
  33         u32 *vaddr = (u32 *)buffer->vaddr;
  34
  35         BUG_ON(buffer->user_size >= buffer->size);
  36
  37         vaddr[buffer->user_size / 4] = data;
  38         buffer->user_size += 4;
  39 }
  40
  41 static inline void CMD_LOAD_STATE(struct etnaviv_cmdbuf *buffer,
  42         u32 reg, u32 value)
  43 {
  44         u32 index = reg >> VIV_FE_LOAD_STATE_HEADER_OFFSET__SHR;
  45
  46         buffer->user_size = ALIGN(buffer->user_size, 8);
  47
  48         /* write a register via cmd stream */
  49         OUT(buffer, VIV_FE_LOAD_STATE_HEADER_OP_LOAD_STATE |
  50                     VIV_FE_LOAD_STATE_HEADER_COUNT(1) |
  51                     VIV_FE_LOAD_STATE_HEADER_OFFSET(index));
  52         OUT(buffer, value);
  53 }
  54
  55 static inline void CMD_END(struct etnaviv_cmdbuf *buffer)
  56 {
  57         buffer->user_size = ALIGN(buffer->user_size, 8);
  58
  59         OUT(buffer, VIV_FE_END_HEADER_OP_END);
  60 }
  61
  62 static inline void CMD_WAIT(struct etnaviv_cmdbuf *buffer)
  63 {
  64         buffer->user_size = ALIGN(buffer->user_size, 8);
  65
  66         OUT(buffer, VIV_FE_WAIT_HEADER_OP_WAIT | 200);
  67 }
  68
  69 static inline void CMD_LINK(struct etnaviv_cmdbuf *buffer,
  70         u16 prefetch, u32 address)
  71 {
  72         buffer->user_size = ALIGN(buffer->user_size, 8);
  73
  74         OUT(buffer, VIV_FE_LINK_HEADER_OP_LINK |
  75                     VIV_FE_LINK_HEADER_PREFETCH(prefetch));
  76         OUT(buffer, address);
  77 }
  78
  79 static inline void CMD_STALL(struct etnaviv_cmdbuf *buffer,
  80         u32 from, u32 to)
  81 {
  82         buffer->user_size = ALIGN(buffer->user_size, 8);
  83
  84         OUT(buffer, VIV_FE_STALL_HEADER_OP_STALL);
  85         OUT(buffer, VIV_FE_STALL_TOKEN_FROM(from) | VIV_FE_STALL_TOKEN_TO(to));
  86 }
  87
  88 static void etnaviv_cmd_select_pipe(struct etnaviv_cmdbuf *buffer, u8 pipe)
  89 {
  90         u32 flush;
  91         u32 stall;
  92
  93         /*
  94          * This assumes that if we're switching to 2D, we're switching
  95          * away from 3D, and vice versa.  Hence, if we're switching to
  96          * the 2D core, we need to flush the 3D depth and color caches,
  97          * otherwise we need to flush the 2D pixel engine cache.
  98          */
  99         if (pipe == ETNA_PIPE_2D)
 100                 flush = VIVS_GL_FLUSH_CACHE_DEPTH | VIVS_GL_FLUSH_CACHE_COLOR;
 101         else
 102                 flush = VIVS_GL_FLUSH_CACHE_PE2D;
 103
 104         stall = VIVS_GL_SEMAPHORE_TOKEN_FROM(SYNC_RECIPIENT_FE) |
 105                 VIVS_GL_SEMAPHORE_TOKEN_TO(SYNC_RECIPIENT_PE);
 106
 107         CMD_LOAD_STATE(buffer, VIVS_GL_FLUSH_CACHE, flush);
 108         CMD_LOAD_STATE(buffer, VIVS_GL_SEMAPHORE_TOKEN, stall);
 109
 110         CMD_STALL(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 111
 112         CMD_LOAD_STATE(buffer, VIVS_GL_PIPE_SELECT,
 113                        VIVS_GL_PIPE_SELECT_PIPE(pipe));
 114 }
 115
 116 static u32 gpu_va(struct etnaviv_gpu *gpu, struct etnaviv_cmdbuf *buf)
 117 {
 118         return buf->paddr - gpu->memory_base;
 119 }
 120
 121 static void etnaviv_buffer_dump(struct etnaviv_gpu *gpu,
 122         struct etnaviv_cmdbuf *buf, u32 off, u32 len)
 123 {
 124         u32 size = buf->size;
 125         u32 *ptr = buf->vaddr + off;
 126
 127         dev_info(gpu->dev, "virt %p phys 0x%08x free 0x%08x\n",
 128                         ptr, gpu_va(gpu, buf) + off, size - len * 4 - off);
 129
 130         print_hex_dump(KERN_INFO, "cmd ", DUMP_PREFIX_OFFSET, 16, 4,
 131                         ptr, len * 4, 0);
 132 }
 133
 134 /*
 135  * Safely replace the WAIT of a waitlink with a new command and argument.
 136  * The GPU may be executing this WAIT while we're modifying it, so we have
 137  * to write it in a specific order to avoid the GPU branching to somewhere
 138  * else.  'wl_offset' is the offset to the first byte of the WAIT command.
 139  */
 140 static void etnaviv_buffer_replace_wait(struct etnaviv_cmdbuf *buffer,
 141         unsigned int wl_offset, u32 cmd, u32 arg)
 142 {
 143         u32 *lw = buffer->vaddr + wl_offset;
 144
 145         lw[1] = arg;
 146         mb();
 147         lw[0] = cmd;
 148         mb();
 149 }
 150
 151 /*
 152  * Ensure that there is space in the command buffer to contiguously write
 153  * 'cmd_dwords' 64-bit words into the buffer, wrapping if necessary.
 154  */
 155 static u32 etnaviv_buffer_reserve(struct etnaviv_gpu *gpu,
 156         struct etnaviv_cmdbuf *buffer, unsigned int cmd_dwords)
 157 {
 158         if (buffer->user_size + cmd_dwords * sizeof(u64) > buffer->size)
 159                 buffer->user_size = 0;
 160
 161         return gpu_va(gpu, buffer) + buffer->user_size;
 162 }
 163
 164 u16 etnaviv_buffer_init(struct etnaviv_gpu *gpu)
 165 {
 166         struct etnaviv_cmdbuf *buffer = gpu->buffer;
 167
 168         /* initialize buffer */
 169         buffer->user_size = 0;
 170
 171         CMD_WAIT(buffer);
 172         CMD_LINK(buffer, 2, gpu_va(gpu, buffer) + buffer->user_size - 4);
 173
 174         return buffer->user_size / 8;
 175 }
 176
 177 void etnaviv_buffer_end(struct etnaviv_gpu *gpu)
 178 {
 179         struct etnaviv_cmdbuf *buffer = gpu->buffer;
 180
 181         /* Replace the last WAIT with an END */
 182         buffer->user_size -= 16;
 183
 184         CMD_END(buffer);
 185         mb();
 186 }
 187
 188 void etnaviv_buffer_queue(struct etnaviv_gpu *gpu, unsigned int event,
 189         struct etnaviv_cmdbuf *cmdbuf)
 190 {
 191         struct etnaviv_cmdbuf *buffer = gpu->buffer;
 192         unsigned int waitlink_offset = buffer->user_size - 16;
 193         u32 back, link_target, link_size, reserve_size, extra_size = 0;
 194
 195         if (drm_debug & DRM_UT_DRIVER)
 196                 etnaviv_buffer_dump(gpu, buffer, 0, 0x50);
 197
 198         /*
 199          * If we need to flush the MMU prior to submitting this buffer, we
 200          * will need to append a mmu flush load state, followed by a new
 201          * link to this buffer - a total of four additional words.
 202          */
 203         if (gpu->mmu->need_flush || gpu->switch_context) {
 204                 /* link command */
 205                 extra_size += 2;
 206                 /* flush command */
 207                 if (gpu->mmu->need_flush)
 208                         extra_size += 2;
 209                 /* pipe switch commands */
 210                 if (gpu->switch_context)
 211                         extra_size += 8;
 212         }
 213
 214         reserve_size = (6 + extra_size) * 4;
 215
 216         link_target = etnaviv_buffer_reserve(gpu, buffer, reserve_size / 8);
 217
 218         /* save offset back into main buffer */
 219         back = buffer->user_size + reserve_size - 6 * 4;
 220         link_size = 6;
 221
 222         /* Skip over any extra instructions */
 223         link_target += extra_size * sizeof(u32);
 224
 225         if (drm_debug & DRM_UT_DRIVER)
 226                 pr_info("stream link to 0x%08x @ 0x%08x %p\n",
 227                         link_target, gpu_va(gpu, cmdbuf), cmdbuf->vaddr);
 228
 229         /* jump back from cmd to main buffer */
 230         CMD_LINK(cmdbuf, link_size, link_target);
 231
 232         link_target = gpu_va(gpu, cmdbuf);
 233         link_size = cmdbuf->size / 8;
 234
 235         if (drm_debug & DRM_UT_DRIVER) {
 236                 print_hex_dump(KERN_INFO, "cmd ", DUMP_PREFIX_OFFSET, 16, 4,
 237                                cmdbuf->vaddr, cmdbuf->size, 0);
 238
 239                 pr_info("link op: %p\n", buffer->vaddr + waitlink_offset);
 240                 pr_info("addr: 0x%08x\n", link_target);
 241                 pr_info("back: 0x%08x\n", gpu_va(gpu, buffer) + back);
 242                 pr_info("event: %d\n", event);
 243         }
 244
 245         if (gpu->mmu->need_flush || gpu->switch_context) {
 246                 u32 new_target = gpu_va(gpu, buffer) + buffer->user_size;
 247
 248                 if (gpu->mmu->need_flush) {
 249                         /* Add the MMU flush */
 250                         CMD_LOAD_STATE(buffer, VIVS_GL_FLUSH_MMU,
 251                                        VIVS_GL_FLUSH_MMU_FLUSH_FEMMU |
 252                                        VIVS_GL_FLUSH_MMU_FLUSH_UNK1 |
 253                                        VIVS_GL_FLUSH_MMU_FLUSH_UNK2 |
 254                                        VIVS_GL_FLUSH_MMU_FLUSH_PEMMU |
 255                                        VIVS_GL_FLUSH_MMU_FLUSH_UNK4);
 256
 257                         gpu->mmu->need_flush = false;
 258                 }
 259
 260                 if (gpu->switch_context) {
 261                         etnaviv_cmd_select_pipe(buffer, cmdbuf->exec_state);
 262                         gpu->switch_context = false;
 263                 }
 264
 265                 /* And the link to the first buffer */
 266                 CMD_LINK(buffer, link_size, link_target);
 267
 268                 /* Update the link target to point to above instructions */
 269                 link_target = new_target;
 270                 link_size = extra_size;
 271         }
 272
 273         /* trigger event */
 274         CMD_LOAD_STATE(buffer, VIVS_GL_EVENT, VIVS_GL_EVENT_EVENT_ID(event) |
 275                        VIVS_GL_EVENT_FROM_PE);
 276
 277         /* append WAIT/LINK to main buffer */
 278         CMD_WAIT(buffer);
 279         CMD_LINK(buffer, 2, gpu_va(gpu, buffer) + (buffer->user_size - 4));
 280
 281         etnaviv_buffer_replace_wait(buffer, waitlink_offset,
 282                                     VIV_FE_LINK_HEADER_OP_LINK |
 283                                     VIV_FE_LINK_HEADER_PREFETCH(link_size),
 284                                     link_target);
 285
 286         if (drm_debug & DRM_UT_DRIVER)
 287                 etnaviv_buffer_dump(gpu, buffer, 0, 0x50);
 288 }