drivers/gpu/drm/etnaviv/etnaviv_cmd_parser.c

   1 /*
   2  * Copyright (C) 2015 Etnaviv Project
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 as published by
   6  * the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16
  17 #include <linux/kernel.h>
  18
  19 #include "etnaviv_gem.h"
  20 #include "etnaviv_gpu.h"
  21
  22 #include "cmdstream.xml.h"
  23
  24 #define EXTRACT(val, field) (((val) & field##__MASK) >> field##__SHIFT)
  25
  26 struct etna_validation_state {
  27         struct etnaviv_gpu *gpu;
  28         const struct drm_etnaviv_gem_submit_reloc *relocs;
  29         unsigned int num_relocs;
  30         u32 *start;
  31 };
  32
  33 static const struct {
  34         u16 offset;
  35         u16 size;
  36 } etnaviv_sensitive_states[] __initconst = {
  37 #define ST(start, num) { (start) >> 2, (num) }
  38         /* 2D */
  39         ST(0x1200, 1),
  40         ST(0x1228, 1),
  41         ST(0x1238, 1),
  42         ST(0x1284, 1),
  43         ST(0x128c, 1),
  44         ST(0x1304, 1),
  45         ST(0x1310, 1),
  46         ST(0x1318, 1),
  47         ST(0x12800, 4),
  48         ST(0x128a0, 4),
  49         ST(0x128c0, 4),
  50         ST(0x12970, 4),
  51         ST(0x12a00, 8),
  52         ST(0x12b40, 8),
  53         ST(0x12b80, 8),
  54         ST(0x12ce0, 8),
  55         /* 3D */
  56         ST(0x0644, 1),
  57         ST(0x064c, 1),
  58         ST(0x0680, 8),
  59         ST(0x1410, 1),
  60         ST(0x1430, 1),
  61         ST(0x1458, 1),
  62         ST(0x1460, 8),
  63         ST(0x1480, 8),
  64         ST(0x1500, 8),
  65         ST(0x1520, 8),
  66         ST(0x1608, 1),
  67         ST(0x1610, 1),
  68         ST(0x1658, 1),
  69         ST(0x165c, 1),
  70         ST(0x1664, 1),
  71         ST(0x1668, 1),
  72         ST(0x16a4, 1),
  73         ST(0x16c0, 8),
  74         ST(0x16e0, 8),
  75         ST(0x1740, 8),
  76         ST(0x2400, 14 * 16),
  77         ST(0x10800, 32 * 16),
  78 #undef ST
  79 };
  80
  81 #define ETNAVIV_STATES_SIZE (VIV_FE_LOAD_STATE_HEADER_OFFSET__MASK + 1u)
  82 static DECLARE_BITMAP(etnaviv_states, ETNAVIV_STATES_SIZE);
  83
  84 void __init etnaviv_validate_init(void)
  85 {
  86         unsigned int i;
  87
  88         for (i = 0; i < ARRAY_SIZE(etnaviv_sensitive_states); i++)
  89                 bitmap_set(etnaviv_states, etnaviv_sensitive_states[i].offset,
  90                            etnaviv_sensitive_states[i].size);
  91 }
  92
  93 static void etnaviv_warn_if_non_sensitive(struct etna_validation_state *state,
  94         unsigned int buf_offset, unsigned int state_addr)
  95 {
  96         if (state->num_relocs && state->relocs->submit_offset < buf_offset) {
  97                 dev_warn_once(state->gpu->dev,
  98                               "%s: relocation for non-sensitive state 0x%x at offset %u\n",
  99                               __func__, state_addr,
 100                               state->relocs->submit_offset);
 101                 while (state->num_relocs &&
 102                        state->relocs->submit_offset < buf_offset) {
 103                         state->relocs++;
 104                         state->num_relocs--;
 105                 }
 106         }
 107 }
 108
 109 static bool etnaviv_validate_load_state(struct etna_validation_state *state,
 110         u32 *ptr, unsigned int state_offset, unsigned int num)
 111 {
 112         unsigned int size = min(ETNAVIV_STATES_SIZE, state_offset + num);
 113         unsigned int st_offset = state_offset, buf_offset;
 114
 115         for_each_set_bit_from(st_offset, etnaviv_states, size) {
 116                 buf_offset = (ptr - state->start +
 117                               st_offset - state_offset) * 4;
 118
 119                 etnaviv_warn_if_non_sensitive(state, buf_offset, st_offset * 4);
 120                 if (state->num_relocs &&
 121                     state->relocs->submit_offset == buf_offset) {
 122                         state->relocs++;
 123                         state->num_relocs--;
 124                         continue;
 125                 }
 126
 127                 dev_warn_ratelimited(state->gpu->dev,
 128                                      "%s: load state touches restricted state 0x%x at offset %u\n",
 129                                      __func__, st_offset * 4, buf_offset);
 130                 return false;
 131         }
 132
 133         if (state->num_relocs) {
 134                 buf_offset = (ptr - state->start + num) * 4;
 135                 etnaviv_warn_if_non_sensitive(state, buf_offset, st_offset * 4 +
 136                                               state->relocs->submit_offset -
 137                                               buf_offset);
 138         }
 139
 140         return true;
 141 }
 142
 143 static uint8_t cmd_length[32] = {
 144         [FE_OPCODE_DRAW_PRIMITIVES] = 4,
 145         [FE_OPCODE_DRAW_INDEXED_PRIMITIVES] = 6,
 146         [FE_OPCODE_NOP] = 2,
 147         [FE_OPCODE_STALL] = 2,
 148 };
 149
 150 bool etnaviv_cmd_validate_one(struct etnaviv_gpu *gpu, u32 *stream,
 151                               unsigned int size,
 152                               struct drm_etnaviv_gem_submit_reloc *relocs,
 153                               unsigned int reloc_size)
 154 {
 155         struct etna_validation_state state;
 156         u32 *buf = stream;
 157         u32 *end = buf + size;
 158
 159         state.gpu = gpu;
 160         state.relocs = relocs;
 161         state.num_relocs = reloc_size;
 162         state.start = stream;
 163
 164         while (buf < end) {
 165                 u32 cmd = *buf;
 166                 unsigned int len, n, off;
 167                 unsigned int op = cmd >> 27;
 168
 169                 switch (op) {
 170                 case FE_OPCODE_LOAD_STATE:
 171                         n = EXTRACT(cmd, VIV_FE_LOAD_STATE_HEADER_COUNT);
 172                         len = ALIGN(1 + n, 2);
 173                         if (buf + len > end)
 174                                 break;
 175
 176                         off = EXTRACT(cmd, VIV_FE_LOAD_STATE_HEADER_OFFSET);
 177                         if (!etnaviv_validate_load_state(&state, buf + 1,
 178                                                          off, n))
 179                                 return false;
 180                         break;
 181
 182                 case FE_OPCODE_DRAW_2D:
 183                         n = EXTRACT(cmd, VIV_FE_DRAW_2D_HEADER_COUNT);
 184                         if (n == 0)
 185                                 n = 256;
 186                         len = 2 + n * 2;
 187                         break;
 188
 189                 default:
 190                         len = cmd_length[op];
 191                         if (len == 0) {
 192                                 dev_err(gpu->dev, "%s: op %u not permitted at offset %tu\n",
 193                                         __func__, op, buf - state.start);
 194                                 return false;
 195                         }
 196                         break;
 197                 }
 198
 199                 buf += len;
 200         }
 201
 202         if (buf > end) {
 203                 dev_err(gpu->dev, "%s: commands overflow end of buffer: %tu > %u\n",
 204                         __func__, buf - state.start, size);
 205                 return false;
 206         }
 207
 208         return true;
 209 }