drivers/gpu/drm/etnaviv/etnaviv_cmd_parser.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2015-2018 Etnaviv Project
   4  */
   5
   6 #include <linux/kernel.h>
   7
   8 #include "etnaviv_gem.h"
   9 #include "etnaviv_gpu.h"
  10
  11 #include "cmdstream.xml.h"
  12
  13 #define EXTRACT(val, field) (((val) & field##__MASK) >> field##__SHIFT)
  14
  15 struct etna_validation_state {
  16         struct etnaviv_gpu *gpu;
  17         const struct drm_etnaviv_gem_submit_reloc *relocs;
  18         unsigned int num_relocs;
  19         u32 *start;
  20 };
  21
  22 static const struct {
  23         u16 offset;
  24         u16 size;
  25 } etnaviv_sensitive_states[] __initconst = {
  26 #define ST(start, num) { (start) >> 2, (num) }
  27         /* 2D */
  28         ST(0x1200, 1),
  29         ST(0x1228, 1),
  30         ST(0x1238, 1),
  31         ST(0x1284, 1),
  32         ST(0x128c, 1),
  33         ST(0x1304, 1),
  34         ST(0x1310, 1),
  35         ST(0x1318, 1),
  36         ST(0x12800, 4),
  37         ST(0x128a0, 4),
  38         ST(0x128c0, 4),
  39         ST(0x12970, 4),
  40         ST(0x12a00, 8),
  41         ST(0x12b40, 8),
  42         ST(0x12b80, 8),
  43         ST(0x12ce0, 8),
  44         /* 3D */
  45         ST(0x0644, 1),
  46         ST(0x064c, 1),
  47         ST(0x0680, 8),
  48         ST(0x086c, 1),
  49         ST(0x1028, 1),
  50         ST(0x1410, 1),
  51         ST(0x1430, 1),
  52         ST(0x1458, 1),
  53         ST(0x1460, 8),
  54         ST(0x1480, 8),
  55         ST(0x1500, 8),
  56         ST(0x1520, 8),
  57         ST(0x1608, 1),
  58         ST(0x1610, 1),
  59         ST(0x1658, 1),
  60         ST(0x165c, 1),
  61         ST(0x1664, 1),
  62         ST(0x1668, 1),
  63         ST(0x16a4, 1),
  64         ST(0x16c0, 8),
  65         ST(0x16e0, 8),
  66         ST(0x1740, 8),
  67         ST(0x17c0, 8),
  68         ST(0x17e0, 8),
  69         ST(0x2400, 14 * 16),
  70         ST(0x3824, 1),
  71         ST(0x10800, 32 * 16),
  72         ST(0x14600, 16),
  73         ST(0x14800, 8 * 8),
  74 #undef ST
  75 };
  76
  77 #define ETNAVIV_STATES_SIZE (VIV_FE_LOAD_STATE_HEADER_OFFSET__MASK + 1u)
  78 static DECLARE_BITMAP(etnaviv_states, ETNAVIV_STATES_SIZE);
  79
  80 void __init etnaviv_validate_init(void)
  81 {
  82         unsigned int i;
  83
  84         for (i = 0; i < ARRAY_SIZE(etnaviv_sensitive_states); i++)
  85                 bitmap_set(etnaviv_states, etnaviv_sensitive_states[i].offset,
  86                            etnaviv_sensitive_states[i].size);
  87 }
  88
  89 static void etnaviv_warn_if_non_sensitive(struct etna_validation_state *state,
  90         unsigned int buf_offset, unsigned int state_addr)
  91 {
  92         if (state->num_relocs && state->relocs->submit_offset < buf_offset) {
  93                 dev_warn_once(state->gpu->dev,
  94                               "%s: relocation for non-sensitive state 0x%x at offset %u\n",
  95                               __func__, state_addr,
  96                               state->relocs->submit_offset);
  97                 while (state->num_relocs &&
  98                        state->relocs->submit_offset < buf_offset) {
  99                         state->relocs++;
 100                         state->num_relocs--;
 101                 }
 102         }
 103 }
 104
 105 static bool etnaviv_validate_load_state(struct etna_validation_state *state,
 106         u32 *ptr, unsigned int state_offset, unsigned int num)
 107 {
 108         unsigned int size = min(ETNAVIV_STATES_SIZE, state_offset + num);
 109         unsigned int st_offset = state_offset, buf_offset;
 110
 111         for_each_set_bit_from(st_offset, etnaviv_states, size) {
 112                 buf_offset = (ptr - state->start +
 113                               st_offset - state_offset) * 4;
 114
 115                 etnaviv_warn_if_non_sensitive(state, buf_offset, st_offset * 4);
 116                 if (state->num_relocs &&
 117                     state->relocs->submit_offset == buf_offset) {
 118                         state->relocs++;
 119                         state->num_relocs--;
 120                         continue;
 121                 }
 122
 123                 dev_warn_ratelimited(state->gpu->dev,
 124                                      "%s: load state touches restricted state 0x%x at offset %u\n",
 125                                      __func__, st_offset * 4, buf_offset);
 126                 return false;
 127         }
 128
 129         if (state->num_relocs) {
 130                 buf_offset = (ptr - state->start + num) * 4;
 131                 etnaviv_warn_if_non_sensitive(state, buf_offset, st_offset * 4 +
 132                                               state->relocs->submit_offset -
 133                                               buf_offset);
 134         }
 135
 136         return true;
 137 }
 138
 139 static uint8_t cmd_length[32] = {
 140         [FE_OPCODE_DRAW_PRIMITIVES] = 4,
 141         [FE_OPCODE_DRAW_INDEXED_PRIMITIVES] = 6,
 142         [FE_OPCODE_DRAW_INSTANCED] = 4,
 143         [FE_OPCODE_NOP] = 2,
 144         [FE_OPCODE_STALL] = 2,
 145 };
 146
 147 bool etnaviv_cmd_validate_one(struct etnaviv_gpu *gpu, u32 *stream,
 148                               unsigned int size,
 149                               struct drm_etnaviv_gem_submit_reloc *relocs,
 150                               unsigned int reloc_size)
 151 {
 152         struct etna_validation_state state;
 153         u32 *buf = stream;
 154         u32 *end = buf + size;
 155
 156         state.gpu = gpu;
 157         state.relocs = relocs;
 158         state.num_relocs = reloc_size;
 159         state.start = stream;
 160
 161         while (buf < end) {
 162                 u32 cmd = *buf;
 163                 unsigned int len, n, off;
 164                 unsigned int op = cmd >> 27;
 165
 166                 switch (op) {
 167                 case FE_OPCODE_LOAD_STATE:
 168                         n = EXTRACT(cmd, VIV_FE_LOAD_STATE_HEADER_COUNT);
 169                         len = ALIGN(1 + n, 2);
 170                         if (buf + len > end)
 171                                 break;
 172
 173                         off = EXTRACT(cmd, VIV_FE_LOAD_STATE_HEADER_OFFSET);
 174                         if (!etnaviv_validate_load_state(&state, buf + 1,
 175                                                          off, n))
 176                                 return false;
 177                         break;
 178
 179                 case FE_OPCODE_DRAW_2D:
 180                         n = EXTRACT(cmd, VIV_FE_DRAW_2D_HEADER_COUNT);
 181                         if (n == 0)
 182                                 n = 256;
 183                         len = 2 + n * 2;
 184                         break;
 185
 186                 default:
 187                         len = cmd_length[op];
 188                         if (len == 0) {
 189                                 dev_err(gpu->dev, "%s: op %u not permitted at offset %tu\n",
 190                                         __func__, op, buf - state.start);
 191                                 return false;
 192                         }
 193                         break;
 194                 }
 195
 196                 buf += len;
 197         }
 198
 199         if (buf > end) {
 200                 dev_err(gpu->dev, "%s: commands overflow end of buffer: %tu > %u\n",
 201                         __func__, buf - state.start, size);
 202                 return false;
 203         }
 204
 205         return true;
 206 }