LCOV - code coverage report
Current view: top level - drivers/gpu/drm/i915 - i915_cmd_parser.c (source / functions) Hit Total Coverage
Test: combined.info Lines: 0 363 0.0 %
Date: 2022-03-28 13:20:08 Functions: 0 18 0.0 %
Branches: 0 227 0.0 %

           Branch data     Line data    Source code
       1                 :            : /*
       2                 :            :  * Copyright © 2013 Intel Corporation
       3                 :            :  *
       4                 :            :  * Permission is hereby granted, free of charge, to any person obtaining a
       5                 :            :  * copy of this software and associated documentation files (the "Software"),
       6                 :            :  * to deal in the Software without restriction, including without limitation
       7                 :            :  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
       8                 :            :  * and/or sell copies of the Software, and to permit persons to whom the
       9                 :            :  * Software is furnished to do so, subject to the following conditions:
      10                 :            :  *
      11                 :            :  * The above copyright notice and this permission notice (including the next
      12                 :            :  * paragraph) shall be included in all copies or substantial portions of the
      13                 :            :  * Software.
      14                 :            :  *
      15                 :            :  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
      16                 :            :  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
      17                 :            :  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
      18                 :            :  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
      19                 :            :  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
      20                 :            :  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
      21                 :            :  * IN THE SOFTWARE.
      22                 :            :  *
      23                 :            :  * Authors:
      24                 :            :  *    Brad Volkin <bradley.d.volkin@intel.com>
      25                 :            :  *
      26                 :            :  */
      27                 :            : 
      28                 :            : #include "gt/intel_engine.h"
      29                 :            : 
      30                 :            : #include "i915_drv.h"
      31                 :            : #include "i915_memcpy.h"
      32                 :            : 
      33                 :            : /**
      34                 :            :  * DOC: batch buffer command parser
      35                 :            :  *
      36                 :            :  * Motivation:
      37                 :            :  * Certain OpenGL features (e.g. transform feedback, performance monitoring)
      38                 :            :  * require userspace code to submit batches containing commands such as
      39                 :            :  * MI_LOAD_REGISTER_IMM to access various registers. Unfortunately, some
      40                 :            :  * generations of the hardware will noop these commands in "unsecure" batches
      41                 :            :  * (which includes all userspace batches submitted via i915) even though the
      42                 :            :  * commands may be safe and represent the intended programming model of the
      43                 :            :  * device.
      44                 :            :  *
      45                 :            :  * The software command parser is similar in operation to the command parsing
      46                 :            :  * done in hardware for unsecure batches. However, the software parser allows
      47                 :            :  * some operations that would be noop'd by hardware, if the parser determines
      48                 :            :  * the operation is safe, and submits the batch as "secure" to prevent hardware
      49                 :            :  * parsing.
      50                 :            :  *
      51                 :            :  * Threats:
      52                 :            :  * At a high level, the hardware (and software) checks attempt to prevent
      53                 :            :  * granting userspace undue privileges. There are three categories of privilege.
      54                 :            :  *
      55                 :            :  * First, commands which are explicitly defined as privileged or which should
      56                 :            :  * only be used by the kernel driver. The parser rejects such commands
      57                 :            :  *
      58                 :            :  * Second, commands which access registers. To support correct/enhanced
      59                 :            :  * userspace functionality, particularly certain OpenGL extensions, the parser
      60                 :            :  * provides a whitelist of registers which userspace may safely access
      61                 :            :  *
      62                 :            :  * Third, commands which access privileged memory (i.e. GGTT, HWS page, etc).
      63                 :            :  * The parser always rejects such commands.
      64                 :            :  *
      65                 :            :  * The majority of the problematic commands fall in the MI_* range, with only a
      66                 :            :  * few specific commands on each engine (e.g. PIPE_CONTROL and MI_FLUSH_DW).
      67                 :            :  *
      68                 :            :  * Implementation:
      69                 :            :  * Each engine maintains tables of commands and registers which the parser
      70                 :            :  * uses in scanning batch buffers submitted to that engine.
      71                 :            :  *
      72                 :            :  * Since the set of commands that the parser must check for is significantly
      73                 :            :  * smaller than the number of commands supported, the parser tables contain only
      74                 :            :  * those commands required by the parser. This generally works because command
      75                 :            :  * opcode ranges have standard command length encodings. So for commands that
      76                 :            :  * the parser does not need to check, it can easily skip them. This is
      77                 :            :  * implemented via a per-engine length decoding vfunc.
      78                 :            :  *
      79                 :            :  * Unfortunately, there are a number of commands that do not follow the standard
      80                 :            :  * length encoding for their opcode range, primarily amongst the MI_* commands.
      81                 :            :  * To handle this, the parser provides a way to define explicit "skip" entries
      82                 :            :  * in the per-engine command tables.
      83                 :            :  *
      84                 :            :  * Other command table entries map fairly directly to high level categories
      85                 :            :  * mentioned above: rejected, register whitelist. The parser implements a number
      86                 :            :  * of checks, including the privileged memory checks, via a general bitmasking
      87                 :            :  * mechanism.
      88                 :            :  */
      89                 :            : 
      90                 :            : /*
      91                 :            :  * A command that requires special handling by the command parser.
      92                 :            :  */
      93                 :            : struct drm_i915_cmd_descriptor {
      94                 :            :         /*
      95                 :            :          * Flags describing how the command parser processes the command.
      96                 :            :          *
      97                 :            :          * CMD_DESC_FIXED: The command has a fixed length if this is set,
      98                 :            :          *                 a length mask if not set
      99                 :            :          * CMD_DESC_SKIP: The command is allowed but does not follow the
     100                 :            :          *                standard length encoding for the opcode range in
     101                 :            :          *                which it falls
     102                 :            :          * CMD_DESC_REJECT: The command is never allowed
     103                 :            :          * CMD_DESC_REGISTER: The command should be checked against the
     104                 :            :          *                    register whitelist for the appropriate ring
     105                 :            :          */
     106                 :            :         u32 flags;
     107                 :            : #define CMD_DESC_FIXED    (1<<0)
     108                 :            : #define CMD_DESC_SKIP     (1<<1)
     109                 :            : #define CMD_DESC_REJECT   (1<<2)
     110                 :            : #define CMD_DESC_REGISTER (1<<3)
     111                 :            : #define CMD_DESC_BITMASK  (1<<4)
     112                 :            : 
     113                 :            :         /*
     114                 :            :          * The command's unique identification bits and the bitmask to get them.
     115                 :            :          * This isn't strictly the opcode field as defined in the spec and may
     116                 :            :          * also include type, subtype, and/or subop fields.
     117                 :            :          */
     118                 :            :         struct {
     119                 :            :                 u32 value;
     120                 :            :                 u32 mask;
     121                 :            :         } cmd;
     122                 :            : 
     123                 :            :         /*
     124                 :            :          * The command's length. The command is either fixed length (i.e. does
     125                 :            :          * not include a length field) or has a length field mask. The flag
     126                 :            :          * CMD_DESC_FIXED indicates a fixed length. Otherwise, the command has
     127                 :            :          * a length mask. All command entries in a command table must include
     128                 :            :          * length information.
     129                 :            :          */
     130                 :            :         union {
     131                 :            :                 u32 fixed;
     132                 :            :                 u32 mask;
     133                 :            :         } length;
     134                 :            : 
     135                 :            :         /*
     136                 :            :          * Describes where to find a register address in the command to check
     137                 :            :          * against the ring's register whitelist. Only valid if flags has the
     138                 :            :          * CMD_DESC_REGISTER bit set.
     139                 :            :          *
     140                 :            :          * A non-zero step value implies that the command may access multiple
     141                 :            :          * registers in sequence (e.g. LRI), in that case step gives the
     142                 :            :          * distance in dwords between individual offset fields.
     143                 :            :          */
     144                 :            :         struct {
     145                 :            :                 u32 offset;
     146                 :            :                 u32 mask;
     147                 :            :                 u32 step;
     148                 :            :         } reg;
     149                 :            : 
     150                 :            : #define MAX_CMD_DESC_BITMASKS 3
     151                 :            :         /*
     152                 :            :          * Describes command checks where a particular dword is masked and
     153                 :            :          * compared against an expected value. If the command does not match
     154                 :            :          * the expected value, the parser rejects it. Only valid if flags has
     155                 :            :          * the CMD_DESC_BITMASK bit set. Only entries where mask is non-zero
     156                 :            :          * are valid.
     157                 :            :          *
     158                 :            :          * If the check specifies a non-zero condition_mask then the parser
     159                 :            :          * only performs the check when the bits specified by condition_mask
     160                 :            :          * are non-zero.
     161                 :            :          */
     162                 :            :         struct {
     163                 :            :                 u32 offset;
     164                 :            :                 u32 mask;
     165                 :            :                 u32 expected;
     166                 :            :                 u32 condition_offset;
     167                 :            :                 u32 condition_mask;
     168                 :            :         } bits[MAX_CMD_DESC_BITMASKS];
     169                 :            : };
     170                 :            : 
     171                 :            : /*
     172                 :            :  * A table of commands requiring special handling by the command parser.
     173                 :            :  *
     174                 :            :  * Each engine has an array of tables. Each table consists of an array of
     175                 :            :  * command descriptors, which must be sorted with command opcodes in
     176                 :            :  * ascending order.
     177                 :            :  */
     178                 :            : struct drm_i915_cmd_table {
     179                 :            :         const struct drm_i915_cmd_descriptor *table;
     180                 :            :         int count;
     181                 :            : };
     182                 :            : 
     183                 :            : #define STD_MI_OPCODE_SHIFT  (32 - 9)
     184                 :            : #define STD_3D_OPCODE_SHIFT  (32 - 16)
     185                 :            : #define STD_2D_OPCODE_SHIFT  (32 - 10)
     186                 :            : #define STD_MFX_OPCODE_SHIFT (32 - 16)
     187                 :            : #define MIN_OPCODE_SHIFT 16
     188                 :            : 
     189                 :            : #define CMD(op, opm, f, lm, fl, ...)                            \
     190                 :            :         {                                                       \
     191                 :            :                 .flags = (fl) | ((f) ? CMD_DESC_FIXED : 0),     \
     192                 :            :                 .cmd = { (op & ~0u << (opm)), ~0u << (opm) },   \
     193                 :            :                 .length = { (lm) },                             \
     194                 :            :                 __VA_ARGS__                                     \
     195                 :            :         }
     196                 :            : 
     197                 :            : /* Convenience macros to compress the tables */
     198                 :            : #define SMI STD_MI_OPCODE_SHIFT
     199                 :            : #define S3D STD_3D_OPCODE_SHIFT
     200                 :            : #define S2D STD_2D_OPCODE_SHIFT
     201                 :            : #define SMFX STD_MFX_OPCODE_SHIFT
     202                 :            : #define F true
     203                 :            : #define S CMD_DESC_SKIP
     204                 :            : #define R CMD_DESC_REJECT
     205                 :            : #define W CMD_DESC_REGISTER
     206                 :            : #define B CMD_DESC_BITMASK
     207                 :            : 
     208                 :            : /*            Command                          Mask   Fixed Len   Action
     209                 :            :               ---------------------------------------------------------- */
     210                 :            : static const struct drm_i915_cmd_descriptor gen7_common_cmds[] = {
     211                 :            :         CMD(  MI_NOOP,                          SMI,    F,  1,      S  ),
     212                 :            :         CMD(  MI_USER_INTERRUPT,                SMI,    F,  1,      R  ),
     213                 :            :         CMD(  MI_WAIT_FOR_EVENT,                SMI,    F,  1,      R  ),
     214                 :            :         CMD(  MI_ARB_CHECK,                     SMI,    F,  1,      S  ),
     215                 :            :         CMD(  MI_REPORT_HEAD,                   SMI,    F,  1,      S  ),
     216                 :            :         CMD(  MI_SUSPEND_FLUSH,                 SMI,    F,  1,      S  ),
     217                 :            :         CMD(  MI_SEMAPHORE_MBOX,                SMI,   !F,  0xFF,   R  ),
     218                 :            :         CMD(  MI_STORE_DWORD_INDEX,             SMI,   !F,  0xFF,   R  ),
     219                 :            :         CMD(  MI_LOAD_REGISTER_IMM(1),          SMI,   !F,  0xFF,   W,
     220                 :            :               .reg = { .offset = 1, .mask = 0x007FFFFC, .step = 2 }    ),
     221                 :            :         CMD(  MI_STORE_REGISTER_MEM,            SMI,    F,  3,     W | B,
     222                 :            :               .reg = { .offset = 1, .mask = 0x007FFFFC },
     223                 :            :               .bits = {{
     224                 :            :                         .offset = 0,
     225                 :            :                         .mask = MI_GLOBAL_GTT,
     226                 :            :                         .expected = 0,
     227                 :            :               }},                                                      ),
     228                 :            :         CMD(  MI_LOAD_REGISTER_MEM,             SMI,    F,  3,     W | B,
     229                 :            :               .reg = { .offset = 1, .mask = 0x007FFFFC },
     230                 :            :               .bits = {{
     231                 :            :                         .offset = 0,
     232                 :            :                         .mask = MI_GLOBAL_GTT,
     233                 :            :                         .expected = 0,
     234                 :            :               }},                                                      ),
     235                 :            :         /*
     236                 :            :          * MI_BATCH_BUFFER_START requires some special handling. It's not
     237                 :            :          * really a 'skip' action but it doesn't seem like it's worth adding
     238                 :            :          * a new action. See intel_engine_cmd_parser().
     239                 :            :          */
     240                 :            :         CMD(  MI_BATCH_BUFFER_START,            SMI,   !F,  0xFF,   S  ),
     241                 :            : };
     242                 :            : 
     243                 :            : static const struct drm_i915_cmd_descriptor gen7_render_cmds[] = {
     244                 :            :         CMD(  MI_FLUSH,                         SMI,    F,  1,      S  ),
     245                 :            :         CMD(  MI_ARB_ON_OFF,                    SMI,    F,  1,      R  ),
     246                 :            :         CMD(  MI_PREDICATE,                     SMI,    F,  1,      S  ),
     247                 :            :         CMD(  MI_TOPOLOGY_FILTER,               SMI,    F,  1,      S  ),
     248                 :            :         CMD(  MI_SET_APPID,                     SMI,    F,  1,      S  ),
     249                 :            :         CMD(  MI_DISPLAY_FLIP,                  SMI,   !F,  0xFF,   R  ),
     250                 :            :         CMD(  MI_SET_CONTEXT,                   SMI,   !F,  0xFF,   R  ),
     251                 :            :         CMD(  MI_URB_CLEAR,                     SMI,   !F,  0xFF,   S  ),
     252                 :            :         CMD(  MI_STORE_DWORD_IMM,               SMI,   !F,  0x3F,   B,
     253                 :            :               .bits = {{
     254                 :            :                         .offset = 0,
     255                 :            :                         .mask = MI_GLOBAL_GTT,
     256                 :            :                         .expected = 0,
     257                 :            :               }},                                                      ),
     258                 :            :         CMD(  MI_UPDATE_GTT,                    SMI,   !F,  0xFF,   R  ),
     259                 :            :         CMD(  MI_CLFLUSH,                       SMI,   !F,  0x3FF,  B,
     260                 :            :               .bits = {{
     261                 :            :                         .offset = 0,
     262                 :            :                         .mask = MI_GLOBAL_GTT,
     263                 :            :                         .expected = 0,
     264                 :            :               }},                                                      ),
     265                 :            :         CMD(  MI_REPORT_PERF_COUNT,             SMI,   !F,  0x3F,   B,
     266                 :            :               .bits = {{
     267                 :            :                         .offset = 1,
     268                 :            :                         .mask = MI_REPORT_PERF_COUNT_GGTT,
     269                 :            :                         .expected = 0,
     270                 :            :               }},                                                      ),
     271                 :            :         CMD(  MI_CONDITIONAL_BATCH_BUFFER_END,  SMI,   !F,  0xFF,   B,
     272                 :            :               .bits = {{
     273                 :            :                         .offset = 0,
     274                 :            :                         .mask = MI_GLOBAL_GTT,
     275                 :            :                         .expected = 0,
     276                 :            :               }},                                                      ),
     277                 :            :         CMD(  GFX_OP_3DSTATE_VF_STATISTICS,     S3D,    F,  1,      S  ),
     278                 :            :         CMD(  PIPELINE_SELECT,                  S3D,    F,  1,      S  ),
     279                 :            :         CMD(  MEDIA_VFE_STATE,                  S3D,   !F,  0xFFFF, B,
     280                 :            :               .bits = {{
     281                 :            :                         .offset = 2,
     282                 :            :                         .mask = MEDIA_VFE_STATE_MMIO_ACCESS_MASK,
     283                 :            :                         .expected = 0,
     284                 :            :               }},                                                      ),
     285                 :            :         CMD(  GPGPU_OBJECT,                     S3D,   !F,  0xFF,   S  ),
     286                 :            :         CMD(  GPGPU_WALKER,                     S3D,   !F,  0xFF,   S  ),
     287                 :            :         CMD(  GFX_OP_3DSTATE_SO_DECL_LIST,      S3D,   !F,  0x1FF,  S  ),
     288                 :            :         CMD(  GFX_OP_PIPE_CONTROL(5),           S3D,   !F,  0xFF,   B,
     289                 :            :               .bits = {{
     290                 :            :                         .offset = 1,
     291                 :            :                         .mask = (PIPE_CONTROL_MMIO_WRITE | PIPE_CONTROL_NOTIFY),
     292                 :            :                         .expected = 0,
     293                 :            :               },
     294                 :            :               {
     295                 :            :                         .offset = 1,
     296                 :            :                         .mask = (PIPE_CONTROL_GLOBAL_GTT_IVB |
     297                 :            :                                  PIPE_CONTROL_STORE_DATA_INDEX),
     298                 :            :                         .expected = 0,
     299                 :            :                         .condition_offset = 1,
     300                 :            :                         .condition_mask = PIPE_CONTROL_POST_SYNC_OP_MASK,
     301                 :            :               }},                                                      ),
     302                 :            : };
     303                 :            : 
     304                 :            : static const struct drm_i915_cmd_descriptor hsw_render_cmds[] = {
     305                 :            :         CMD(  MI_SET_PREDICATE,                 SMI,    F,  1,      S  ),
     306                 :            :         CMD(  MI_RS_CONTROL,                    SMI,    F,  1,      S  ),
     307                 :            :         CMD(  MI_URB_ATOMIC_ALLOC,              SMI,    F,  1,      S  ),
     308                 :            :         CMD(  MI_SET_APPID,                     SMI,    F,  1,      S  ),
     309                 :            :         CMD(  MI_RS_CONTEXT,                    SMI,    F,  1,      S  ),
     310                 :            :         CMD(  MI_LOAD_SCAN_LINES_INCL,          SMI,   !F,  0x3F,   R  ),
     311                 :            :         CMD(  MI_LOAD_SCAN_LINES_EXCL,          SMI,   !F,  0x3F,   R  ),
     312                 :            :         CMD(  MI_LOAD_REGISTER_REG,             SMI,   !F,  0xFF,   W,
     313                 :            :               .reg = { .offset = 1, .mask = 0x007FFFFC, .step = 1 }    ),
     314                 :            :         CMD(  MI_RS_STORE_DATA_IMM,             SMI,   !F,  0xFF,   S  ),
     315                 :            :         CMD(  MI_LOAD_URB_MEM,                  SMI,   !F,  0xFF,   S  ),
     316                 :            :         CMD(  MI_STORE_URB_MEM,                 SMI,   !F,  0xFF,   S  ),
     317                 :            :         CMD(  GFX_OP_3DSTATE_DX9_CONSTANTF_VS,  S3D,   !F,  0x7FF,  S  ),
     318                 :            :         CMD(  GFX_OP_3DSTATE_DX9_CONSTANTF_PS,  S3D,   !F,  0x7FF,  S  ),
     319                 :            : 
     320                 :            :         CMD(  GFX_OP_3DSTATE_BINDING_TABLE_EDIT_VS,  S3D,   !F,  0x1FF,  S  ),
     321                 :            :         CMD(  GFX_OP_3DSTATE_BINDING_TABLE_EDIT_GS,  S3D,   !F,  0x1FF,  S  ),
     322                 :            :         CMD(  GFX_OP_3DSTATE_BINDING_TABLE_EDIT_HS,  S3D,   !F,  0x1FF,  S  ),
     323                 :            :         CMD(  GFX_OP_3DSTATE_BINDING_TABLE_EDIT_DS,  S3D,   !F,  0x1FF,  S  ),
     324                 :            :         CMD(  GFX_OP_3DSTATE_BINDING_TABLE_EDIT_PS,  S3D,   !F,  0x1FF,  S  ),
     325                 :            : };
     326                 :            : 
     327                 :            : static const struct drm_i915_cmd_descriptor gen7_video_cmds[] = {
     328                 :            :         CMD(  MI_ARB_ON_OFF,                    SMI,    F,  1,      R  ),
     329                 :            :         CMD(  MI_SET_APPID,                     SMI,    F,  1,      S  ),
     330                 :            :         CMD(  MI_STORE_DWORD_IMM,               SMI,   !F,  0xFF,   B,
     331                 :            :               .bits = {{
     332                 :            :                         .offset = 0,
     333                 :            :                         .mask = MI_GLOBAL_GTT,
     334                 :            :                         .expected = 0,
     335                 :            :               }},                                                      ),
     336                 :            :         CMD(  MI_UPDATE_GTT,                    SMI,   !F,  0x3F,   R  ),
     337                 :            :         CMD(  MI_FLUSH_DW,                      SMI,   !F,  0x3F,   B,
     338                 :            :               .bits = {{
     339                 :            :                         .offset = 0,
     340                 :            :                         .mask = MI_FLUSH_DW_NOTIFY,
     341                 :            :                         .expected = 0,
     342                 :            :               },
     343                 :            :               {
     344                 :            :                         .offset = 1,
     345                 :            :                         .mask = MI_FLUSH_DW_USE_GTT,
     346                 :            :                         .expected = 0,
     347                 :            :                         .condition_offset = 0,
     348                 :            :                         .condition_mask = MI_FLUSH_DW_OP_MASK,
     349                 :            :               },
     350                 :            :               {
     351                 :            :                         .offset = 0,
     352                 :            :                         .mask = MI_FLUSH_DW_STORE_INDEX,
     353                 :            :                         .expected = 0,
     354                 :            :                         .condition_offset = 0,
     355                 :            :                         .condition_mask = MI_FLUSH_DW_OP_MASK,
     356                 :            :               }},                                                      ),
     357                 :            :         CMD(  MI_CONDITIONAL_BATCH_BUFFER_END,  SMI,   !F,  0xFF,   B,
     358                 :            :               .bits = {{
     359                 :            :                         .offset = 0,
     360                 :            :                         .mask = MI_GLOBAL_GTT,
     361                 :            :                         .expected = 0,
     362                 :            :               }},                                                      ),
     363                 :            :         /*
     364                 :            :          * MFX_WAIT doesn't fit the way we handle length for most commands.
     365                 :            :          * It has a length field but it uses a non-standard length bias.
     366                 :            :          * It is always 1 dword though, so just treat it as fixed length.
     367                 :            :          */
     368                 :            :         CMD(  MFX_WAIT,                         SMFX,   F,  1,      S  ),
     369                 :            : };
     370                 :            : 
     371                 :            : static const struct drm_i915_cmd_descriptor gen7_vecs_cmds[] = {
     372                 :            :         CMD(  MI_ARB_ON_OFF,                    SMI,    F,  1,      R  ),
     373                 :            :         CMD(  MI_SET_APPID,                     SMI,    F,  1,      S  ),
     374                 :            :         CMD(  MI_STORE_DWORD_IMM,               SMI,   !F,  0xFF,   B,
     375                 :            :               .bits = {{
     376                 :            :                         .offset = 0,
     377                 :            :                         .mask = MI_GLOBAL_GTT,
     378                 :            :                         .expected = 0,
     379                 :            :               }},                                                      ),
     380                 :            :         CMD(  MI_UPDATE_GTT,                    SMI,   !F,  0x3F,   R  ),
     381                 :            :         CMD(  MI_FLUSH_DW,                      SMI,   !F,  0x3F,   B,
     382                 :            :               .bits = {{
     383                 :            :                         .offset = 0,
     384                 :            :                         .mask = MI_FLUSH_DW_NOTIFY,
     385                 :            :                         .expected = 0,
     386                 :            :               },
     387                 :            :               {
     388                 :            :                         .offset = 1,
     389                 :            :                         .mask = MI_FLUSH_DW_USE_GTT,
     390                 :            :                         .expected = 0,
     391                 :            :                         .condition_offset = 0,
     392                 :            :                         .condition_mask = MI_FLUSH_DW_OP_MASK,
     393                 :            :               },
     394                 :            :               {
     395                 :            :                         .offset = 0,
     396                 :            :                         .mask = MI_FLUSH_DW_STORE_INDEX,
     397                 :            :                         .expected = 0,
     398                 :            :                         .condition_offset = 0,
     399                 :            :                         .condition_mask = MI_FLUSH_DW_OP_MASK,
     400                 :            :               }},                                                      ),
     401                 :            :         CMD(  MI_CONDITIONAL_BATCH_BUFFER_END,  SMI,   !F,  0xFF,   B,
     402                 :            :               .bits = {{
     403                 :            :                         .offset = 0,
     404                 :            :                         .mask = MI_GLOBAL_GTT,
     405                 :            :                         .expected = 0,
     406                 :            :               }},                                                      ),
     407                 :            : };
     408                 :            : 
     409                 :            : static const struct drm_i915_cmd_descriptor gen7_blt_cmds[] = {
     410                 :            :         CMD(  MI_DISPLAY_FLIP,                  SMI,   !F,  0xFF,   R  ),
     411                 :            :         CMD(  MI_STORE_DWORD_IMM,               SMI,   !F,  0x3FF,  B,
     412                 :            :               .bits = {{
     413                 :            :                         .offset = 0,
     414                 :            :                         .mask = MI_GLOBAL_GTT,
     415                 :            :                         .expected = 0,
     416                 :            :               }},                                                      ),
     417                 :            :         CMD(  MI_UPDATE_GTT,                    SMI,   !F,  0x3F,   R  ),
     418                 :            :         CMD(  MI_FLUSH_DW,                      SMI,   !F,  0x3F,   B,
     419                 :            :               .bits = {{
     420                 :            :                         .offset = 0,
     421                 :            :                         .mask = MI_FLUSH_DW_NOTIFY,
     422                 :            :                         .expected = 0,
     423                 :            :               },
     424                 :            :               {
     425                 :            :                         .offset = 1,
     426                 :            :                         .mask = MI_FLUSH_DW_USE_GTT,
     427                 :            :                         .expected = 0,
     428                 :            :                         .condition_offset = 0,
     429                 :            :                         .condition_mask = MI_FLUSH_DW_OP_MASK,
     430                 :            :               },
     431                 :            :               {
     432                 :            :                         .offset = 0,
     433                 :            :                         .mask = MI_FLUSH_DW_STORE_INDEX,
     434                 :            :                         .expected = 0,
     435                 :            :                         .condition_offset = 0,
     436                 :            :                         .condition_mask = MI_FLUSH_DW_OP_MASK,
     437                 :            :               }},                                                      ),
     438                 :            :         CMD(  COLOR_BLT,                        S2D,   !F,  0x3F,   S  ),
     439                 :            :         CMD(  SRC_COPY_BLT,                     S2D,   !F,  0x3F,   S  ),
     440                 :            : };
     441                 :            : 
     442                 :            : static const struct drm_i915_cmd_descriptor hsw_blt_cmds[] = {
     443                 :            :         CMD(  MI_LOAD_SCAN_LINES_INCL,          SMI,   !F,  0x3F,   R  ),
     444                 :            :         CMD(  MI_LOAD_SCAN_LINES_EXCL,          SMI,   !F,  0x3F,   R  ),
     445                 :            : };
     446                 :            : 
     447                 :            : /*
     448                 :            :  * For Gen9 we can still rely on the h/w to enforce cmd security, and only
     449                 :            :  * need to re-enforce the register access checks. We therefore only need to
     450                 :            :  * teach the cmdparser how to find the end of each command, and identify
     451                 :            :  * register accesses. The table doesn't need to reject any commands, and so
     452                 :            :  * the only commands listed here are:
     453                 :            :  *   1) Those that touch registers
     454                 :            :  *   2) Those that do not have the default 8-bit length
     455                 :            :  *
     456                 :            :  * Note that the default MI length mask chosen for this table is 0xFF, not
     457                 :            :  * the 0x3F used on older devices. This is because the vast majority of MI
     458                 :            :  * cmds on Gen9 use a standard 8-bit Length field.
     459                 :            :  * All the Gen9 blitter instructions are standard 0xFF length mask, and
     460                 :            :  * none allow access to non-general registers, so in fact no BLT cmds are
     461                 :            :  * included in the table at all.
     462                 :            :  *
     463                 :            :  */
     464                 :            : static const struct drm_i915_cmd_descriptor gen9_blt_cmds[] = {
     465                 :            :         CMD(  MI_NOOP,                          SMI,    F,  1,      S  ),
     466                 :            :         CMD(  MI_USER_INTERRUPT,                SMI,    F,  1,      S  ),
     467                 :            :         CMD(  MI_WAIT_FOR_EVENT,                SMI,    F,  1,      S  ),
     468                 :            :         CMD(  MI_FLUSH,                         SMI,    F,  1,      S  ),
     469                 :            :         CMD(  MI_ARB_CHECK,                     SMI,    F,  1,      S  ),
     470                 :            :         CMD(  MI_REPORT_HEAD,                   SMI,    F,  1,      S  ),
     471                 :            :         CMD(  MI_ARB_ON_OFF,                    SMI,    F,  1,      S  ),
     472                 :            :         CMD(  MI_SUSPEND_FLUSH,                 SMI,    F,  1,      S  ),
     473                 :            :         CMD(  MI_LOAD_SCAN_LINES_INCL,          SMI,   !F,  0x3F,   S  ),
     474                 :            :         CMD(  MI_LOAD_SCAN_LINES_EXCL,          SMI,   !F,  0x3F,   S  ),
     475                 :            :         CMD(  MI_STORE_DWORD_IMM,               SMI,   !F,  0x3FF,  S  ),
     476                 :            :         CMD(  MI_LOAD_REGISTER_IMM(1),          SMI,   !F,  0xFF,   W,
     477                 :            :               .reg = { .offset = 1, .mask = 0x007FFFFC, .step = 2 }    ),
     478                 :            :         CMD(  MI_UPDATE_GTT,                    SMI,   !F,  0x3FF,  S  ),
     479                 :            :         CMD(  MI_STORE_REGISTER_MEM_GEN8,       SMI,    F,  4,      W,
     480                 :            :               .reg = { .offset = 1, .mask = 0x007FFFFC }               ),
     481                 :            :         CMD(  MI_FLUSH_DW,                      SMI,   !F,  0x3F,   S  ),
     482                 :            :         CMD(  MI_LOAD_REGISTER_MEM_GEN8,        SMI,    F,  4,      W,
     483                 :            :               .reg = { .offset = 1, .mask = 0x007FFFFC }               ),
     484                 :            :         CMD(  MI_LOAD_REGISTER_REG,             SMI,    !F,  0xFF,  W,
     485                 :            :               .reg = { .offset = 1, .mask = 0x007FFFFC, .step = 1 }    ),
     486                 :            : 
     487                 :            :         /*
     488                 :            :          * We allow BB_START but apply further checks. We just sanitize the
     489                 :            :          * basic fields here.
     490                 :            :          */
     491                 :            : #define MI_BB_START_OPERAND_MASK   GENMASK(SMI-1, 0)
     492                 :            : #define MI_BB_START_OPERAND_EXPECT (MI_BATCH_PPGTT_HSW | 1)
     493                 :            :         CMD(  MI_BATCH_BUFFER_START_GEN8,       SMI,    !F,  0xFF,  B,
     494                 :            :               .bits = {{
     495                 :            :                         .offset = 0,
     496                 :            :                         .mask = MI_BB_START_OPERAND_MASK,
     497                 :            :                         .expected = MI_BB_START_OPERAND_EXPECT,
     498                 :            :               }},                                                      ),
     499                 :            : };
     500                 :            : 
     501                 :            : static const struct drm_i915_cmd_descriptor noop_desc =
     502                 :            :         CMD(MI_NOOP, SMI, F, 1, S);
     503                 :            : 
     504                 :            : #undef CMD
     505                 :            : #undef SMI
     506                 :            : #undef S3D
     507                 :            : #undef S2D
     508                 :            : #undef SMFX
     509                 :            : #undef F
     510                 :            : #undef S
     511                 :            : #undef R
     512                 :            : #undef W
     513                 :            : #undef B
     514                 :            : 
     515                 :            : static const struct drm_i915_cmd_table gen7_render_cmd_table[] = {
     516                 :            :         { gen7_common_cmds, ARRAY_SIZE(gen7_common_cmds) },
     517                 :            :         { gen7_render_cmds, ARRAY_SIZE(gen7_render_cmds) },
     518                 :            : };
     519                 :            : 
     520                 :            : static const struct drm_i915_cmd_table hsw_render_ring_cmd_table[] = {
     521                 :            :         { gen7_common_cmds, ARRAY_SIZE(gen7_common_cmds) },
     522                 :            :         { gen7_render_cmds, ARRAY_SIZE(gen7_render_cmds) },
     523                 :            :         { hsw_render_cmds, ARRAY_SIZE(hsw_render_cmds) },
     524                 :            : };
     525                 :            : 
     526                 :            : static const struct drm_i915_cmd_table gen7_video_cmd_table[] = {
     527                 :            :         { gen7_common_cmds, ARRAY_SIZE(gen7_common_cmds) },
     528                 :            :         { gen7_video_cmds, ARRAY_SIZE(gen7_video_cmds) },
     529                 :            : };
     530                 :            : 
     531                 :            : static const struct drm_i915_cmd_table hsw_vebox_cmd_table[] = {
     532                 :            :         { gen7_common_cmds, ARRAY_SIZE(gen7_common_cmds) },
     533                 :            :         { gen7_vecs_cmds, ARRAY_SIZE(gen7_vecs_cmds) },
     534                 :            : };
     535                 :            : 
     536                 :            : static const struct drm_i915_cmd_table gen7_blt_cmd_table[] = {
     537                 :            :         { gen7_common_cmds, ARRAY_SIZE(gen7_common_cmds) },
     538                 :            :         { gen7_blt_cmds, ARRAY_SIZE(gen7_blt_cmds) },
     539                 :            : };
     540                 :            : 
     541                 :            : static const struct drm_i915_cmd_table hsw_blt_ring_cmd_table[] = {
     542                 :            :         { gen7_common_cmds, ARRAY_SIZE(gen7_common_cmds) },
     543                 :            :         { gen7_blt_cmds, ARRAY_SIZE(gen7_blt_cmds) },
     544                 :            :         { hsw_blt_cmds, ARRAY_SIZE(hsw_blt_cmds) },
     545                 :            : };
     546                 :            : 
     547                 :            : static const struct drm_i915_cmd_table gen9_blt_cmd_table[] = {
     548                 :            :         { gen9_blt_cmds, ARRAY_SIZE(gen9_blt_cmds) },
     549                 :            : };
     550                 :            : 
     551                 :            : 
     552                 :            : /*
     553                 :            :  * Register whitelists, sorted by increasing register offset.
     554                 :            :  */
     555                 :            : 
     556                 :            : /*
     557                 :            :  * An individual whitelist entry granting access to register addr.  If
     558                 :            :  * mask is non-zero the argument of immediate register writes will be
     559                 :            :  * AND-ed with mask, and the command will be rejected if the result
     560                 :            :  * doesn't match value.
     561                 :            :  *
     562                 :            :  * Registers with non-zero mask are only allowed to be written using
     563                 :            :  * LRI.
     564                 :            :  */
     565                 :            : struct drm_i915_reg_descriptor {
     566                 :            :         i915_reg_t addr;
     567                 :            :         u32 mask;
     568                 :            :         u32 value;
     569                 :            : };
     570                 :            : 
     571                 :            : /* Convenience macro for adding 32-bit registers. */
     572                 :            : #define REG32(_reg, ...) \
     573                 :            :         { .addr = (_reg), __VA_ARGS__ }
     574                 :            : 
     575                 :            : /*
     576                 :            :  * Convenience macro for adding 64-bit registers.
     577                 :            :  *
     578                 :            :  * Some registers that userspace accesses are 64 bits. The register
     579                 :            :  * access commands only allow 32-bit accesses. Hence, we have to include
     580                 :            :  * entries for both halves of the 64-bit registers.
     581                 :            :  */
     582                 :            : #define REG64(_reg) \
     583                 :            :         { .addr = _reg }, \
     584                 :            :         { .addr = _reg ## _UDW }
     585                 :            : 
     586                 :            : #define REG64_IDX(_reg, idx) \
     587                 :            :         { .addr = _reg(idx) }, \
     588                 :            :         { .addr = _reg ## _UDW(idx) }
     589                 :            : 
     590                 :            : static const struct drm_i915_reg_descriptor gen7_render_regs[] = {
     591                 :            :         REG64(GPGPU_THREADS_DISPATCHED),
     592                 :            :         REG64(HS_INVOCATION_COUNT),
     593                 :            :         REG64(DS_INVOCATION_COUNT),
     594                 :            :         REG64(IA_VERTICES_COUNT),
     595                 :            :         REG64(IA_PRIMITIVES_COUNT),
     596                 :            :         REG64(VS_INVOCATION_COUNT),
     597                 :            :         REG64(GS_INVOCATION_COUNT),
     598                 :            :         REG64(GS_PRIMITIVES_COUNT),
     599                 :            :         REG64(CL_INVOCATION_COUNT),
     600                 :            :         REG64(CL_PRIMITIVES_COUNT),
     601                 :            :         REG64(PS_INVOCATION_COUNT),
     602                 :            :         REG64(PS_DEPTH_COUNT),
     603                 :            :         REG64_IDX(RING_TIMESTAMP, RENDER_RING_BASE),
     604                 :            :         REG64(MI_PREDICATE_SRC0),
     605                 :            :         REG64(MI_PREDICATE_SRC1),
     606                 :            :         REG32(GEN7_3DPRIM_END_OFFSET),
     607                 :            :         REG32(GEN7_3DPRIM_START_VERTEX),
     608                 :            :         REG32(GEN7_3DPRIM_VERTEX_COUNT),
     609                 :            :         REG32(GEN7_3DPRIM_INSTANCE_COUNT),
     610                 :            :         REG32(GEN7_3DPRIM_START_INSTANCE),
     611                 :            :         REG32(GEN7_3DPRIM_BASE_VERTEX),
     612                 :            :         REG32(GEN7_GPGPU_DISPATCHDIMX),
     613                 :            :         REG32(GEN7_GPGPU_DISPATCHDIMY),
     614                 :            :         REG32(GEN7_GPGPU_DISPATCHDIMZ),
     615                 :            :         REG64_IDX(RING_TIMESTAMP, BSD_RING_BASE),
     616                 :            :         REG64_IDX(GEN7_SO_NUM_PRIMS_WRITTEN, 0),
     617                 :            :         REG64_IDX(GEN7_SO_NUM_PRIMS_WRITTEN, 1),
     618                 :            :         REG64_IDX(GEN7_SO_NUM_PRIMS_WRITTEN, 2),
     619                 :            :         REG64_IDX(GEN7_SO_NUM_PRIMS_WRITTEN, 3),
     620                 :            :         REG64_IDX(GEN7_SO_PRIM_STORAGE_NEEDED, 0),
     621                 :            :         REG64_IDX(GEN7_SO_PRIM_STORAGE_NEEDED, 1),
     622                 :            :         REG64_IDX(GEN7_SO_PRIM_STORAGE_NEEDED, 2),
     623                 :            :         REG64_IDX(GEN7_SO_PRIM_STORAGE_NEEDED, 3),
     624                 :            :         REG32(GEN7_SO_WRITE_OFFSET(0)),
     625                 :            :         REG32(GEN7_SO_WRITE_OFFSET(1)),
     626                 :            :         REG32(GEN7_SO_WRITE_OFFSET(2)),
     627                 :            :         REG32(GEN7_SO_WRITE_OFFSET(3)),
     628                 :            :         REG32(GEN7_L3SQCREG1),
     629                 :            :         REG32(GEN7_L3CNTLREG2),
     630                 :            :         REG32(GEN7_L3CNTLREG3),
     631                 :            :         REG64_IDX(RING_TIMESTAMP, BLT_RING_BASE),
     632                 :            : };
     633                 :            : 
     634                 :            : static const struct drm_i915_reg_descriptor hsw_render_regs[] = {
     635                 :            :         REG64_IDX(HSW_CS_GPR, 0),
     636                 :            :         REG64_IDX(HSW_CS_GPR, 1),
     637                 :            :         REG64_IDX(HSW_CS_GPR, 2),
     638                 :            :         REG64_IDX(HSW_CS_GPR, 3),
     639                 :            :         REG64_IDX(HSW_CS_GPR, 4),
     640                 :            :         REG64_IDX(HSW_CS_GPR, 5),
     641                 :            :         REG64_IDX(HSW_CS_GPR, 6),
     642                 :            :         REG64_IDX(HSW_CS_GPR, 7),
     643                 :            :         REG64_IDX(HSW_CS_GPR, 8),
     644                 :            :         REG64_IDX(HSW_CS_GPR, 9),
     645                 :            :         REG64_IDX(HSW_CS_GPR, 10),
     646                 :            :         REG64_IDX(HSW_CS_GPR, 11),
     647                 :            :         REG64_IDX(HSW_CS_GPR, 12),
     648                 :            :         REG64_IDX(HSW_CS_GPR, 13),
     649                 :            :         REG64_IDX(HSW_CS_GPR, 14),
     650                 :            :         REG64_IDX(HSW_CS_GPR, 15),
     651                 :            :         REG32(HSW_SCRATCH1,
     652                 :            :               .mask = ~HSW_SCRATCH1_L3_DATA_ATOMICS_DISABLE,
     653                 :            :               .value = 0),
     654                 :            :         REG32(HSW_ROW_CHICKEN3,
     655                 :            :               .mask = ~(HSW_ROW_CHICKEN3_L3_GLOBAL_ATOMICS_DISABLE << 16 |
     656                 :            :                         HSW_ROW_CHICKEN3_L3_GLOBAL_ATOMICS_DISABLE),
     657                 :            :               .value = 0),
     658                 :            : };
     659                 :            : 
     660                 :            : static const struct drm_i915_reg_descriptor gen7_blt_regs[] = {
     661                 :            :         REG64_IDX(RING_TIMESTAMP, RENDER_RING_BASE),
     662                 :            :         REG64_IDX(RING_TIMESTAMP, BSD_RING_BASE),
     663                 :            :         REG32(BCS_SWCTRL),
     664                 :            :         REG64_IDX(RING_TIMESTAMP, BLT_RING_BASE),
     665                 :            : };
     666                 :            : 
     667                 :            : static const struct drm_i915_reg_descriptor gen9_blt_regs[] = {
     668                 :            :         REG64_IDX(RING_TIMESTAMP, RENDER_RING_BASE),
     669                 :            :         REG64_IDX(RING_TIMESTAMP, BSD_RING_BASE),
     670                 :            :         REG32(BCS_SWCTRL),
     671                 :            :         REG64_IDX(RING_TIMESTAMP, BLT_RING_BASE),
     672                 :            :         REG64_IDX(BCS_GPR, 0),
     673                 :            :         REG64_IDX(BCS_GPR, 1),
     674                 :            :         REG64_IDX(BCS_GPR, 2),
     675                 :            :         REG64_IDX(BCS_GPR, 3),
     676                 :            :         REG64_IDX(BCS_GPR, 4),
     677                 :            :         REG64_IDX(BCS_GPR, 5),
     678                 :            :         REG64_IDX(BCS_GPR, 6),
     679                 :            :         REG64_IDX(BCS_GPR, 7),
     680                 :            :         REG64_IDX(BCS_GPR, 8),
     681                 :            :         REG64_IDX(BCS_GPR, 9),
     682                 :            :         REG64_IDX(BCS_GPR, 10),
     683                 :            :         REG64_IDX(BCS_GPR, 11),
     684                 :            :         REG64_IDX(BCS_GPR, 12),
     685                 :            :         REG64_IDX(BCS_GPR, 13),
     686                 :            :         REG64_IDX(BCS_GPR, 14),
     687                 :            :         REG64_IDX(BCS_GPR, 15),
     688                 :            : };
     689                 :            : 
     690                 :            : #undef REG64
     691                 :            : #undef REG32
     692                 :            : 
     693                 :            : struct drm_i915_reg_table {
     694                 :            :         const struct drm_i915_reg_descriptor *regs;
     695                 :            :         int num_regs;
     696                 :            : };
     697                 :            : 
     698                 :            : static const struct drm_i915_reg_table ivb_render_reg_tables[] = {
     699                 :            :         { gen7_render_regs, ARRAY_SIZE(gen7_render_regs) },
     700                 :            : };
     701                 :            : 
     702                 :            : static const struct drm_i915_reg_table ivb_blt_reg_tables[] = {
     703                 :            :         { gen7_blt_regs, ARRAY_SIZE(gen7_blt_regs) },
     704                 :            : };
     705                 :            : 
     706                 :            : static const struct drm_i915_reg_table hsw_render_reg_tables[] = {
     707                 :            :         { gen7_render_regs, ARRAY_SIZE(gen7_render_regs) },
     708                 :            :         { hsw_render_regs, ARRAY_SIZE(hsw_render_regs) },
     709                 :            : };
     710                 :            : 
     711                 :            : static const struct drm_i915_reg_table hsw_blt_reg_tables[] = {
     712                 :            :         { gen7_blt_regs, ARRAY_SIZE(gen7_blt_regs) },
     713                 :            : };
     714                 :            : 
     715                 :            : static const struct drm_i915_reg_table gen9_blt_reg_tables[] = {
     716                 :            :         { gen9_blt_regs, ARRAY_SIZE(gen9_blt_regs) },
     717                 :            : };
     718                 :            : 
     719                 :          0 : static u32 gen7_render_get_cmd_length_mask(u32 cmd_header)
     720                 :            : {
     721                 :          0 :         u32 client = cmd_header >> INSTR_CLIENT_SHIFT;
     722                 :          0 :         u32 subclient =
     723                 :          0 :                 (cmd_header & INSTR_SUBCLIENT_MASK) >> INSTR_SUBCLIENT_SHIFT;
     724                 :            : 
     725         [ #  # ]:          0 :         if (client == INSTR_MI_CLIENT)
     726                 :            :                 return 0x3F;
     727         [ #  # ]:          0 :         else if (client == INSTR_RC_CLIENT) {
     728         [ #  # ]:          0 :                 if (subclient == INSTR_MEDIA_SUBCLIENT)
     729                 :            :                         return 0xFFFF;
     730                 :            :                 else
     731                 :          0 :                         return 0xFF;
     732                 :            :         }
     733                 :            : 
     734                 :          0 :         DRM_DEBUG("CMD: Abnormal rcs cmd length! 0x%08X\n", cmd_header);
     735                 :          0 :         return 0;
     736                 :            : }
     737                 :            : 
     738                 :          0 : static u32 gen7_bsd_get_cmd_length_mask(u32 cmd_header)
     739                 :            : {
     740                 :          0 :         u32 client = cmd_header >> INSTR_CLIENT_SHIFT;
     741                 :          0 :         u32 subclient =
     742                 :          0 :                 (cmd_header & INSTR_SUBCLIENT_MASK) >> INSTR_SUBCLIENT_SHIFT;
     743                 :          0 :         u32 op = (cmd_header & INSTR_26_TO_24_MASK) >> INSTR_26_TO_24_SHIFT;
     744                 :            : 
     745         [ #  # ]:          0 :         if (client == INSTR_MI_CLIENT)
     746                 :            :                 return 0x3F;
     747         [ #  # ]:          0 :         else if (client == INSTR_RC_CLIENT) {
     748         [ #  # ]:          0 :                 if (subclient == INSTR_MEDIA_SUBCLIENT) {
     749         [ #  # ]:          0 :                         if (op == 6)
     750                 :            :                                 return 0xFFFF;
     751                 :            :                         else
     752                 :          0 :                                 return 0xFFF;
     753                 :            :                 } else
     754                 :            :                         return 0xFF;
     755                 :            :         }
     756                 :            : 
     757                 :          0 :         DRM_DEBUG("CMD: Abnormal bsd cmd length! 0x%08X\n", cmd_header);
     758                 :          0 :         return 0;
     759                 :            : }
     760                 :            : 
     761                 :          0 : static u32 gen7_blt_get_cmd_length_mask(u32 cmd_header)
     762                 :            : {
     763                 :          0 :         u32 client = cmd_header >> INSTR_CLIENT_SHIFT;
     764                 :            : 
     765         [ #  # ]:          0 :         if (client == INSTR_MI_CLIENT)
     766                 :            :                 return 0x3F;
     767         [ #  # ]:          0 :         else if (client == INSTR_BC_CLIENT)
     768                 :            :                 return 0xFF;
     769                 :            : 
     770                 :          0 :         DRM_DEBUG("CMD: Abnormal blt cmd length! 0x%08X\n", cmd_header);
     771                 :          0 :         return 0;
     772                 :            : }
     773                 :            : 
     774                 :          0 : static u32 gen9_blt_get_cmd_length_mask(u32 cmd_header)
     775                 :            : {
     776                 :          0 :         u32 client = cmd_header >> INSTR_CLIENT_SHIFT;
     777                 :            : 
     778         [ #  # ]:          0 :         if (client == INSTR_MI_CLIENT || client == INSTR_BC_CLIENT)
     779                 :            :                 return 0xFF;
     780                 :            : 
     781                 :          0 :         DRM_DEBUG("CMD: Abnormal blt cmd length! 0x%08X\n", cmd_header);
     782                 :          0 :         return 0;
     783                 :            : }
     784                 :            : 
     785                 :          0 : static bool validate_cmds_sorted(const struct intel_engine_cs *engine,
     786                 :            :                                  const struct drm_i915_cmd_table *cmd_tables,
     787                 :            :                                  int cmd_table_count)
     788                 :            : {
     789                 :          0 :         int i;
     790                 :          0 :         bool ret = true;
     791                 :            : 
     792         [ #  # ]:          0 :         if (!cmd_tables || cmd_table_count == 0)
     793                 :            :                 return true;
     794                 :            : 
     795         [ #  # ]:          0 :         for (i = 0; i < cmd_table_count; i++) {
     796                 :          0 :                 const struct drm_i915_cmd_table *table = &cmd_tables[i];
     797                 :          0 :                 u32 previous = 0;
     798                 :          0 :                 int j;
     799                 :            : 
     800         [ #  # ]:          0 :                 for (j = 0; j < table->count; j++) {
     801                 :          0 :                         const struct drm_i915_cmd_descriptor *desc =
     802                 :          0 :                                 &table->table[j];
     803                 :          0 :                         u32 curr = desc->cmd.value & desc->cmd.mask;
     804                 :            : 
     805         [ #  # ]:          0 :                         if (curr < previous) {
     806                 :          0 :                                 DRM_ERROR("CMD: %s [%d] command table not sorted: "
     807                 :            :                                           "table=%d entry=%d cmd=0x%08X prev=0x%08X\n",
     808                 :            :                                           engine->name, engine->id,
     809                 :            :                                           i, j, curr, previous);
     810                 :          0 :                                 ret = false;
     811                 :            :                         }
     812                 :            : 
     813                 :          0 :                         previous = curr;
     814                 :            :                 }
     815                 :            :         }
     816                 :            : 
     817                 :            :         return ret;
     818                 :            : }
     819                 :            : 
     820                 :          0 : static bool check_sorted(const struct intel_engine_cs *engine,
     821                 :            :                          const struct drm_i915_reg_descriptor *reg_table,
     822                 :            :                          int reg_count)
     823                 :            : {
     824                 :          0 :         int i;
     825                 :          0 :         u32 previous = 0;
     826                 :          0 :         bool ret = true;
     827                 :            : 
     828         [ #  # ]:          0 :         for (i = 0; i < reg_count; i++) {
     829         [ #  # ]:          0 :                 u32 curr = i915_mmio_reg_offset(reg_table[i].addr);
     830                 :            : 
     831         [ #  # ]:          0 :                 if (curr < previous) {
     832                 :          0 :                         DRM_ERROR("CMD: %s [%d] register table not sorted: "
     833                 :            :                                   "entry=%d reg=0x%08X prev=0x%08X\n",
     834                 :            :                                   engine->name, engine->id,
     835                 :            :                                   i, curr, previous);
     836                 :          0 :                         ret = false;
     837                 :            :                 }
     838                 :            : 
     839                 :          0 :                 previous = curr;
     840                 :            :         }
     841                 :            : 
     842                 :          0 :         return ret;
     843                 :            : }
     844                 :            : 
     845                 :          0 : static bool validate_regs_sorted(struct intel_engine_cs *engine)
     846                 :            : {
     847                 :          0 :         int i;
     848                 :          0 :         const struct drm_i915_reg_table *table;
     849                 :            : 
     850         [ #  # ]:          0 :         for (i = 0; i < engine->reg_table_count; i++) {
     851                 :          0 :                 table = &engine->reg_tables[i];
     852         [ #  # ]:          0 :                 if (!check_sorted(engine, table->regs, table->num_regs))
     853                 :            :                         return false;
     854                 :            :         }
     855                 :            : 
     856                 :            :         return true;
     857                 :            : }
     858                 :            : 
     859                 :            : struct cmd_node {
     860                 :            :         const struct drm_i915_cmd_descriptor *desc;
     861                 :            :         struct hlist_node node;
     862                 :            : };
     863                 :            : 
     864                 :            : /*
     865                 :            :  * Different command ranges have different numbers of bits for the opcode. For
     866                 :            :  * example, MI commands use bits 31:23 while 3D commands use bits 31:16. The
     867                 :            :  * problem is that, for example, MI commands use bits 22:16 for other fields
     868                 :            :  * such as GGTT vs PPGTT bits. If we include those bits in the mask then when
     869                 :            :  * we mask a command from a batch it could hash to the wrong bucket due to
     870                 :            :  * non-opcode bits being set. But if we don't include those bits, some 3D
     871                 :            :  * commands may hash to the same bucket due to not including opcode bits that
     872                 :            :  * make the command unique. For now, we will risk hashing to the same bucket.
     873                 :            :  */
     874                 :          0 : static inline u32 cmd_header_key(u32 x)
     875                 :            : {
     876                 :          0 :         switch (x >> INSTR_CLIENT_SHIFT) {
     877                 :          0 :         default:
     878                 :            :         case INSTR_MI_CLIENT:
     879                 :          0 :                 return x >> STD_MI_OPCODE_SHIFT;
     880                 :          0 :         case INSTR_RC_CLIENT:
     881                 :          0 :                 return x >> STD_3D_OPCODE_SHIFT;
     882                 :          0 :         case INSTR_BC_CLIENT:
     883                 :          0 :                 return x >> STD_2D_OPCODE_SHIFT;
     884                 :            :         }
     885                 :            : }
     886                 :            : 
     887                 :          0 : static int init_hash_table(struct intel_engine_cs *engine,
     888                 :            :                            const struct drm_i915_cmd_table *cmd_tables,
     889                 :            :                            int cmd_table_count)
     890                 :            : {
     891                 :          0 :         int i, j;
     892                 :            : 
     893                 :          0 :         hash_init(engine->cmd_hash);
     894                 :            : 
     895         [ #  # ]:          0 :         for (i = 0; i < cmd_table_count; i++) {
     896                 :          0 :                 const struct drm_i915_cmd_table *table = &cmd_tables[i];
     897                 :            : 
     898         [ #  # ]:          0 :                 for (j = 0; j < table->count; j++) {
     899                 :          0 :                         const struct drm_i915_cmd_descriptor *desc =
     900                 :          0 :                                 &table->table[j];
     901                 :          0 :                         struct cmd_node *desc_node =
     902                 :            :                                 kmalloc(sizeof(*desc_node), GFP_KERNEL);
     903                 :            : 
     904         [ #  # ]:          0 :                         if (!desc_node)
     905                 :            :                                 return -ENOMEM;
     906                 :            : 
     907                 :          0 :                         desc_node->desc = desc;
     908   [ #  #  #  #  :          0 :                         hash_add(engine->cmd_hash, &desc_node->node,
                      # ]
     909                 :            :                                  cmd_header_key(desc->cmd.value));
     910                 :            :                 }
     911                 :            :         }
     912                 :            : 
     913                 :            :         return 0;
     914                 :            : }
     915                 :            : 
     916                 :          0 : static void fini_hash_table(struct intel_engine_cs *engine)
     917                 :            : {
     918                 :          0 :         struct hlist_node *tmp;
     919                 :          0 :         struct cmd_node *desc_node;
     920                 :          0 :         int i;
     921                 :            : 
     922   [ #  #  #  #  :          0 :         hash_for_each_safe(engine->cmd_hash, i, tmp, desc_node, node) {
             #  #  #  # ]
     923         [ #  # ]:          0 :                 hash_del(&desc_node->node);
     924                 :          0 :                 kfree(desc_node);
     925                 :            :         }
     926                 :          0 : }
     927                 :            : 
     928                 :            : /**
     929                 :            :  * intel_engine_init_cmd_parser() - set cmd parser related fields for an engine
     930                 :            :  * @engine: the engine to initialize
     931                 :            :  *
     932                 :            :  * Optionally initializes fields related to batch buffer command parsing in the
     933                 :            :  * struct intel_engine_cs based on whether the platform requires software
     934                 :            :  * command parsing.
     935                 :            :  */
     936                 :          0 : void intel_engine_init_cmd_parser(struct intel_engine_cs *engine)
     937                 :            : {
     938                 :          0 :         const struct drm_i915_cmd_table *cmd_tables;
     939                 :          0 :         int cmd_table_count;
     940                 :          0 :         int ret;
     941                 :            : 
     942   [ #  #  #  # ]:          0 :         if (!IS_GEN(engine->i915, 7) && !(IS_GEN(engine->i915, 9) &&
     943         [ #  # ]:          0 :                                           engine->class == COPY_ENGINE_CLASS))
     944                 :            :                 return;
     945                 :            : 
     946   [ #  #  #  #  :          0 :         switch (engine->class) {
                      # ]
     947                 :          0 :         case RENDER_CLASS:
     948         [ #  # ]:          0 :                 if (IS_HASWELL(engine->i915)) {
     949                 :            :                         cmd_tables = hsw_render_ring_cmd_table;
     950                 :            :                         cmd_table_count =
     951                 :            :                                 ARRAY_SIZE(hsw_render_ring_cmd_table);
     952                 :            :                 } else {
     953                 :          0 :                         cmd_tables = gen7_render_cmd_table;
     954                 :          0 :                         cmd_table_count = ARRAY_SIZE(gen7_render_cmd_table);
     955                 :            :                 }
     956                 :            : 
     957         [ #  # ]:          0 :                 if (IS_HASWELL(engine->i915)) {
     958                 :          0 :                         engine->reg_tables = hsw_render_reg_tables;
     959                 :          0 :                         engine->reg_table_count = ARRAY_SIZE(hsw_render_reg_tables);
     960                 :            :                 } else {
     961                 :          0 :                         engine->reg_tables = ivb_render_reg_tables;
     962                 :          0 :                         engine->reg_table_count = ARRAY_SIZE(ivb_render_reg_tables);
     963                 :            :                 }
     964                 :          0 :                 engine->get_cmd_length_mask = gen7_render_get_cmd_length_mask;
     965                 :          0 :                 break;
     966                 :          0 :         case VIDEO_DECODE_CLASS:
     967                 :          0 :                 cmd_tables = gen7_video_cmd_table;
     968                 :          0 :                 cmd_table_count = ARRAY_SIZE(gen7_video_cmd_table);
     969                 :          0 :                 engine->get_cmd_length_mask = gen7_bsd_get_cmd_length_mask;
     970                 :          0 :                 break;
     971                 :          0 :         case COPY_ENGINE_CLASS:
     972                 :          0 :                 engine->get_cmd_length_mask = gen7_blt_get_cmd_length_mask;
     973         [ #  # ]:          0 :                 if (IS_GEN(engine->i915, 9)) {
     974                 :          0 :                         cmd_tables = gen9_blt_cmd_table;
     975                 :          0 :                         cmd_table_count = ARRAY_SIZE(gen9_blt_cmd_table);
     976                 :          0 :                         engine->get_cmd_length_mask =
     977                 :            :                                 gen9_blt_get_cmd_length_mask;
     978                 :            : 
     979                 :            :                         /* BCS Engine unsafe without parser */
     980                 :          0 :                         engine->flags |= I915_ENGINE_REQUIRES_CMD_PARSER;
     981         [ #  # ]:          0 :                 } else if (IS_HASWELL(engine->i915)) {
     982                 :            :                         cmd_tables = hsw_blt_ring_cmd_table;
     983                 :            :                         cmd_table_count = ARRAY_SIZE(hsw_blt_ring_cmd_table);
     984                 :            :                 } else {
     985                 :          0 :                         cmd_tables = gen7_blt_cmd_table;
     986                 :          0 :                         cmd_table_count = ARRAY_SIZE(gen7_blt_cmd_table);
     987                 :            :                 }
     988                 :            : 
     989         [ #  # ]:          0 :                 if (IS_GEN(engine->i915, 9)) {
     990                 :          0 :                         engine->reg_tables = gen9_blt_reg_tables;
     991                 :          0 :                         engine->reg_table_count =
     992                 :            :                                 ARRAY_SIZE(gen9_blt_reg_tables);
     993         [ #  # ]:          0 :                 } else if (IS_HASWELL(engine->i915)) {
     994                 :          0 :                         engine->reg_tables = hsw_blt_reg_tables;
     995                 :          0 :                         engine->reg_table_count = ARRAY_SIZE(hsw_blt_reg_tables);
     996                 :            :                 } else {
     997                 :          0 :                         engine->reg_tables = ivb_blt_reg_tables;
     998                 :          0 :                         engine->reg_table_count = ARRAY_SIZE(ivb_blt_reg_tables);
     999                 :            :                 }
    1000                 :            :                 break;
    1001                 :          0 :         case VIDEO_ENHANCEMENT_CLASS:
    1002                 :          0 :                 cmd_tables = hsw_vebox_cmd_table;
    1003                 :          0 :                 cmd_table_count = ARRAY_SIZE(hsw_vebox_cmd_table);
    1004                 :            :                 /* VECS can use the same length_mask function as VCS */
    1005                 :          0 :                 engine->get_cmd_length_mask = gen7_bsd_get_cmd_length_mask;
    1006                 :          0 :                 break;
    1007                 :            :         default:
    1008                 :          0 :                 MISSING_CASE(engine->class);
    1009                 :          0 :                 return;
    1010                 :            :         }
    1011                 :            : 
    1012         [ #  # ]:          0 :         if (!validate_cmds_sorted(engine, cmd_tables, cmd_table_count)) {
    1013                 :          0 :                 DRM_ERROR("%s: command descriptions are not sorted\n",
    1014                 :            :                           engine->name);
    1015                 :          0 :                 return;
    1016                 :            :         }
    1017         [ #  # ]:          0 :         if (!validate_regs_sorted(engine)) {
    1018                 :          0 :                 DRM_ERROR("%s: registers are not sorted\n", engine->name);
    1019                 :          0 :                 return;
    1020                 :            :         }
    1021                 :            : 
    1022                 :          0 :         ret = init_hash_table(engine, cmd_tables, cmd_table_count);
    1023         [ #  # ]:          0 :         if (ret) {
    1024                 :          0 :                 DRM_ERROR("%s: initialised failed!\n", engine->name);
    1025                 :          0 :                 fini_hash_table(engine);
    1026                 :          0 :                 return;
    1027                 :            :         }
    1028                 :            : 
    1029                 :          0 :         engine->flags |= I915_ENGINE_USING_CMD_PARSER;
    1030                 :            : }
    1031                 :            : 
    1032                 :            : /**
    1033                 :            :  * intel_engine_cleanup_cmd_parser() - clean up cmd parser related fields
    1034                 :            :  * @engine: the engine to clean up
    1035                 :            :  *
    1036                 :            :  * Releases any resources related to command parsing that may have been
    1037                 :            :  * initialized for the specified engine.
    1038                 :            :  */
    1039                 :          0 : void intel_engine_cleanup_cmd_parser(struct intel_engine_cs *engine)
    1040                 :            : {
    1041         [ #  # ]:          0 :         if (!intel_engine_using_cmd_parser(engine))
    1042                 :            :                 return;
    1043                 :            : 
    1044                 :          0 :         fini_hash_table(engine);
    1045                 :            : }
    1046                 :            : 
    1047                 :            : static const struct drm_i915_cmd_descriptor*
    1048                 :          0 : find_cmd_in_table(struct intel_engine_cs *engine,
    1049                 :            :                   u32 cmd_header)
    1050                 :            : {
    1051                 :          0 :         struct cmd_node *desc_node;
    1052                 :            : 
    1053   [ #  #  #  #  :          0 :         hash_for_each_possible(engine->cmd_hash, desc_node, node,
             #  #  #  #  
                      # ]
    1054                 :            :                                cmd_header_key(cmd_header)) {
    1055                 :          0 :                 const struct drm_i915_cmd_descriptor *desc = desc_node->desc;
    1056         [ #  # ]:          0 :                 if (((cmd_header ^ desc->cmd.value) & desc->cmd.mask) == 0)
    1057                 :          0 :                         return desc;
    1058                 :            :         }
    1059                 :            : 
    1060                 :            :         return NULL;
    1061                 :            : }
    1062                 :            : 
    1063                 :            : /*
    1064                 :            :  * Returns a pointer to a descriptor for the command specified by cmd_header.
    1065                 :            :  *
    1066                 :            :  * The caller must supply space for a default descriptor via the default_desc
    1067                 :            :  * parameter. If no descriptor for the specified command exists in the engine's
    1068                 :            :  * command parser tables, this function fills in default_desc based on the
    1069                 :            :  * engine's default length encoding and returns default_desc.
    1070                 :            :  */
    1071                 :            : static const struct drm_i915_cmd_descriptor*
    1072                 :          0 : find_cmd(struct intel_engine_cs *engine,
    1073                 :            :          u32 cmd_header,
    1074                 :            :          const struct drm_i915_cmd_descriptor *desc,
    1075                 :            :          struct drm_i915_cmd_descriptor *default_desc)
    1076                 :            : {
    1077                 :          0 :         u32 mask;
    1078                 :            : 
    1079         [ #  # ]:          0 :         if (((cmd_header ^ desc->cmd.value) & desc->cmd.mask) == 0)
    1080                 :            :                 return desc;
    1081                 :            : 
    1082                 :          0 :         desc = find_cmd_in_table(engine, cmd_header);
    1083         [ #  # ]:          0 :         if (desc)
    1084                 :            :                 return desc;
    1085                 :            : 
    1086                 :          0 :         mask = engine->get_cmd_length_mask(cmd_header);
    1087         [ #  # ]:          0 :         if (!mask)
    1088                 :            :                 return NULL;
    1089                 :            : 
    1090                 :          0 :         default_desc->cmd.value = cmd_header;
    1091                 :          0 :         default_desc->cmd.mask = ~0u << MIN_OPCODE_SHIFT;
    1092                 :          0 :         default_desc->length.mask = mask;
    1093                 :          0 :         default_desc->flags = CMD_DESC_SKIP;
    1094                 :          0 :         return default_desc;
    1095                 :            : }
    1096                 :            : 
    1097                 :            : static const struct drm_i915_reg_descriptor *
    1098                 :            : __find_reg(const struct drm_i915_reg_descriptor *table, int count, u32 addr)
    1099                 :            : {
    1100                 :            :         int start = 0, end = count;
    1101                 :            :         while (start < end) {
    1102                 :            :                 int mid = start + (end - start) / 2;
    1103                 :            :                 int ret = addr - i915_mmio_reg_offset(table[mid].addr);
    1104                 :            :                 if (ret < 0)
    1105                 :            :                         end = mid;
    1106                 :            :                 else if (ret > 0)
    1107                 :            :                         start = mid + 1;
    1108                 :            :                 else
    1109                 :            :                         return &table[mid];
    1110                 :            :         }
    1111                 :            :         return NULL;
    1112                 :            : }
    1113                 :            : 
    1114                 :            : static const struct drm_i915_reg_descriptor *
    1115                 :            : find_reg(const struct intel_engine_cs *engine, u32 addr)
    1116                 :            : {
    1117                 :            :         const struct drm_i915_reg_table *table = engine->reg_tables;
    1118                 :            :         const struct drm_i915_reg_descriptor *reg = NULL;
    1119                 :            :         int count = engine->reg_table_count;
    1120                 :            : 
    1121                 :            :         for (; !reg && (count > 0); ++table, --count)
    1122                 :            :                 reg = __find_reg(table->regs, table->num_regs, addr);
    1123                 :            : 
    1124                 :            :         return reg;
    1125                 :            : }
    1126                 :            : 
    1127                 :            : /* Returns a vmap'd pointer to dst_obj, which the caller must unmap */
    1128                 :          0 : static u32 *copy_batch(struct drm_i915_gem_object *dst_obj,
    1129                 :            :                        struct drm_i915_gem_object *src_obj,
    1130                 :            :                        u32 offset, u32 length)
    1131                 :            : {
    1132                 :          0 :         bool needs_clflush;
    1133                 :          0 :         void *dst, *src;
    1134                 :          0 :         int ret;
    1135                 :            : 
    1136                 :          0 :         dst = i915_gem_object_pin_map(dst_obj, I915_MAP_FORCE_WB);
    1137         [ #  # ]:          0 :         if (IS_ERR(dst))
    1138                 :            :                 return dst;
    1139                 :            : 
    1140                 :          0 :         ret = i915_gem_object_pin_pages(src_obj);
    1141         [ #  # ]:          0 :         if (ret) {
    1142                 :          0 :                 i915_gem_object_unpin_map(dst_obj);
    1143                 :          0 :                 return ERR_PTR(ret);
    1144                 :            :         }
    1145                 :            : 
    1146                 :          0 :         needs_clflush =
    1147                 :          0 :                 !(src_obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_READ);
    1148                 :            : 
    1149         [ #  # ]:          0 :         src = ERR_PTR(-ENODEV);
    1150   [ #  #  #  # ]:          0 :         if (needs_clflush && i915_has_memcpy_from_wc()) {
    1151                 :          0 :                 src = i915_gem_object_pin_map(src_obj, I915_MAP_WC);
    1152         [ #  # ]:          0 :                 if (!IS_ERR(src)) {
    1153                 :          0 :                         i915_unaligned_memcpy_from_wc(dst,
    1154                 :            :                                                       src + offset,
    1155                 :            :                                                       length);
    1156                 :          0 :                         i915_gem_object_unpin_map(src_obj);
    1157                 :            :                 }
    1158                 :            :         }
    1159         [ #  # ]:          0 :         if (IS_ERR(src)) {
    1160                 :          0 :                 void *ptr;
    1161                 :          0 :                 int x, n;
    1162                 :            : 
    1163                 :            :                 /*
    1164                 :            :                  * We can avoid clflushing partial cachelines before the write
    1165                 :            :                  * if we only every write full cache-lines. Since we know that
    1166                 :            :                  * both the source and destination are in multiples of
    1167                 :            :                  * PAGE_SIZE, we can simply round up to the next cacheline.
    1168                 :            :                  * We don't care about copying too much here as we only
    1169                 :            :                  * validate up to the end of the batch.
    1170                 :            :                  */
    1171         [ #  # ]:          0 :                 if (!(dst_obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_READ))
    1172                 :          0 :                         length = round_up(length,
    1173                 :            :                                           boot_cpu_data.x86_clflush_size);
    1174                 :            : 
    1175                 :          0 :                 ptr = dst;
    1176                 :          0 :                 x = offset_in_page(offset);
    1177         [ #  # ]:          0 :                 for (n = offset >> PAGE_SHIFT; length; n++) {
    1178                 :          0 :                         int len = min_t(int, length, PAGE_SIZE - x);
    1179                 :            : 
    1180                 :          0 :                         src = kmap_atomic(i915_gem_object_get_page(src_obj, n));
    1181         [ #  # ]:          0 :                         if (needs_clflush)
    1182                 :          0 :                                 drm_clflush_virt_range(src + x, len);
    1183                 :          0 :                         memcpy(ptr, src + x, len);
    1184                 :          0 :                         kunmap_atomic(src);
    1185                 :            : 
    1186                 :          0 :                         ptr += len;
    1187                 :          0 :                         length -= len;
    1188                 :          0 :                         x = 0;
    1189                 :            :                 }
    1190                 :            :         }
    1191                 :            : 
    1192                 :          0 :         i915_gem_object_unpin_pages(src_obj);
    1193                 :            : 
    1194                 :            :         /* dst_obj is returned with vmap pinned */
    1195                 :          0 :         return dst;
    1196                 :            : }
    1197                 :            : 
    1198                 :          0 : static bool check_cmd(const struct intel_engine_cs *engine,
    1199                 :            :                       const struct drm_i915_cmd_descriptor *desc,
    1200                 :            :                       const u32 *cmd, u32 length)
    1201                 :            : {
    1202         [ #  # ]:          0 :         if (desc->flags & CMD_DESC_SKIP)
    1203                 :            :                 return true;
    1204                 :            : 
    1205         [ #  # ]:          0 :         if (desc->flags & CMD_DESC_REJECT) {
    1206                 :          0 :                 DRM_DEBUG("CMD: Rejected command: 0x%08X\n", *cmd);
    1207                 :          0 :                 return false;
    1208                 :            :         }
    1209                 :            : 
    1210         [ #  # ]:          0 :         if (desc->flags & CMD_DESC_REGISTER) {
    1211                 :            :                 /*
    1212                 :            :                  * Get the distance between individual register offset
    1213                 :            :                  * fields if the command can perform more than one
    1214                 :            :                  * access at a time.
    1215                 :            :                  */
    1216         [ #  # ]:          0 :                 const u32 step = desc->reg.step ? desc->reg.step : length;
    1217                 :          0 :                 u32 offset;
    1218                 :            : 
    1219         [ #  # ]:          0 :                 for (offset = desc->reg.offset; offset < length;
    1220                 :          0 :                      offset += step) {
    1221                 :          0 :                         const u32 reg_addr = cmd[offset] & desc->reg.mask;
    1222                 :          0 :                         const struct drm_i915_reg_descriptor *reg =
    1223                 :          0 :                                 find_reg(engine, reg_addr);
    1224                 :            : 
    1225         [ #  # ]:          0 :                         if (!reg) {
    1226                 :          0 :                                 DRM_DEBUG("CMD: Rejected register 0x%08X in command: 0x%08X (%s)\n",
    1227                 :            :                                           reg_addr, *cmd, engine->name);
    1228                 :          0 :                                 return false;
    1229                 :            :                         }
    1230                 :            : 
    1231                 :            :                         /*
    1232                 :            :                          * Check the value written to the register against the
    1233                 :            :                          * allowed mask/value pair given in the whitelist entry.
    1234                 :            :                          */
    1235         [ #  # ]:          0 :                         if (reg->mask) {
    1236         [ #  # ]:          0 :                                 if (desc->cmd.value == MI_LOAD_REGISTER_MEM) {
    1237                 :          0 :                                         DRM_DEBUG("CMD: Rejected LRM to masked register 0x%08X\n",
    1238                 :            :                                                   reg_addr);
    1239                 :          0 :                                         return false;
    1240                 :            :                                 }
    1241                 :            : 
    1242         [ #  # ]:          0 :                                 if (desc->cmd.value == MI_LOAD_REGISTER_REG) {
    1243                 :          0 :                                         DRM_DEBUG("CMD: Rejected LRR to masked register 0x%08X\n",
    1244                 :            :                                                   reg_addr);
    1245                 :          0 :                                         return false;
    1246                 :            :                                 }
    1247                 :            : 
    1248         [ #  # ]:          0 :                                 if (desc->cmd.value == MI_LOAD_REGISTER_IMM(1) &&
    1249         [ #  # ]:          0 :                                     (offset + 2 > length ||
    1250         [ #  # ]:          0 :                                      (cmd[offset + 1] & reg->mask) != reg->value)) {
    1251                 :          0 :                                         DRM_DEBUG("CMD: Rejected LRI to masked register 0x%08X\n",
    1252                 :            :                                                   reg_addr);
    1253                 :          0 :                                         return false;
    1254                 :            :                                 }
    1255                 :            :                         }
    1256                 :            :                 }
    1257                 :            :         }
    1258                 :            : 
    1259         [ #  # ]:          0 :         if (desc->flags & CMD_DESC_BITMASK) {
    1260                 :            :                 int i;
    1261                 :            : 
    1262         [ #  # ]:          0 :                 for (i = 0; i < MAX_CMD_DESC_BITMASKS; i++) {
    1263                 :          0 :                         u32 dword;
    1264                 :            : 
    1265         [ #  # ]:          0 :                         if (desc->bits[i].mask == 0)
    1266                 :            :                                 break;
    1267                 :            : 
    1268         [ #  # ]:          0 :                         if (desc->bits[i].condition_mask != 0) {
    1269                 :          0 :                                 u32 offset =
    1270                 :            :                                         desc->bits[i].condition_offset;
    1271                 :          0 :                                 u32 condition = cmd[offset] &
    1272                 :            :                                         desc->bits[i].condition_mask;
    1273                 :            : 
    1274         [ #  # ]:          0 :                                 if (condition == 0)
    1275                 :          0 :                                         continue;
    1276                 :            :                         }
    1277                 :            : 
    1278         [ #  # ]:          0 :                         if (desc->bits[i].offset >= length) {
    1279                 :          0 :                                 DRM_DEBUG("CMD: Rejected command 0x%08X, too short to check bitmask (%s)\n",
    1280                 :            :                                           *cmd, engine->name);
    1281                 :          0 :                                 return false;
    1282                 :            :                         }
    1283                 :            : 
    1284                 :          0 :                         dword = cmd[desc->bits[i].offset] &
    1285                 :            :                                 desc->bits[i].mask;
    1286                 :            : 
    1287         [ #  # ]:          0 :                         if (dword != desc->bits[i].expected) {
    1288                 :          0 :                                 DRM_DEBUG("CMD: Rejected command 0x%08X for bitmask 0x%08X (exp=0x%08X act=0x%08X) (%s)\n",
    1289                 :            :                                           *cmd,
    1290                 :            :                                           desc->bits[i].mask,
    1291                 :            :                                           desc->bits[i].expected,
    1292                 :            :                                           dword, engine->name);
    1293                 :          0 :                                 return false;
    1294                 :            :                         }
    1295                 :            :                 }
    1296                 :            :         }
    1297                 :            : 
    1298                 :            :         return true;
    1299                 :            : }
    1300                 :            : 
    1301                 :          0 : static int check_bbstart(u32 *cmd, u32 offset, u32 length,
    1302                 :            :                          u32 batch_length,
    1303                 :            :                          u64 batch_addr,
    1304                 :            :                          u64 shadow_addr,
    1305                 :            :                          const unsigned long *jump_whitelist)
    1306                 :            : {
    1307                 :          0 :         u64 jump_offset, jump_target;
    1308                 :          0 :         u32 target_cmd_offset, target_cmd_index;
    1309                 :            : 
    1310                 :            :         /* For igt compatibility on older platforms */
    1311         [ #  # ]:          0 :         if (!jump_whitelist) {
    1312                 :          0 :                 DRM_DEBUG("CMD: Rejecting BB_START for ggtt based submission\n");
    1313                 :          0 :                 return -EACCES;
    1314                 :            :         }
    1315                 :            : 
    1316         [ #  # ]:          0 :         if (length != 3) {
    1317                 :          0 :                 DRM_DEBUG("CMD: Recursive BB_START with bad length(%u)\n",
    1318                 :            :                           length);
    1319                 :          0 :                 return -EINVAL;
    1320                 :            :         }
    1321                 :            : 
    1322                 :          0 :         jump_target = *(u64 *)(cmd + 1);
    1323                 :          0 :         jump_offset = jump_target - batch_addr;
    1324                 :            : 
    1325                 :            :         /*
    1326                 :            :          * Any underflow of jump_target is guaranteed to be outside the range
    1327                 :            :          * of a u32, so >= test catches both too large and too small
    1328                 :            :          */
    1329         [ #  # ]:          0 :         if (jump_offset >= batch_length) {
    1330                 :          0 :                 DRM_DEBUG("CMD: BB_START to 0x%llx jumps out of BB\n",
    1331                 :            :                           jump_target);
    1332                 :          0 :                 return -EINVAL;
    1333                 :            :         }
    1334                 :            : 
    1335                 :            :         /*
    1336                 :            :          * This cannot overflow a u32 because we already checked jump_offset
    1337                 :            :          * is within the BB, and the batch_length is a u32
    1338                 :            :          */
    1339                 :          0 :         target_cmd_offset = lower_32_bits(jump_offset);
    1340                 :          0 :         target_cmd_index = target_cmd_offset / sizeof(u32);
    1341                 :            : 
    1342                 :          0 :         *(u64 *)(cmd + 1) = shadow_addr + target_cmd_offset;
    1343                 :            : 
    1344         [ #  # ]:          0 :         if (target_cmd_index == offset)
    1345                 :            :                 return 0;
    1346                 :            : 
    1347         [ #  # ]:          0 :         if (IS_ERR(jump_whitelist))
    1348                 :          0 :                 return PTR_ERR(jump_whitelist);
    1349                 :            : 
    1350         [ #  # ]:          0 :         if (!test_bit(target_cmd_index, jump_whitelist)) {
    1351                 :          0 :                 DRM_DEBUG("CMD: BB_START to 0x%llx not a previously executed cmd\n",
    1352                 :            :                           jump_target);
    1353                 :          0 :                 return -EINVAL;
    1354                 :            :         }
    1355                 :            : 
    1356                 :            :         return 0;
    1357                 :            : }
    1358                 :            : 
    1359                 :          0 : static unsigned long *alloc_whitelist(u32 batch_length)
    1360                 :            : {
    1361                 :          0 :         unsigned long *jmp;
    1362                 :            : 
    1363                 :            :         /*
    1364                 :            :          * We expect batch_length to be less than 256KiB for known users,
    1365                 :            :          * i.e. we need at most an 8KiB bitmap allocation which should be
    1366                 :            :          * reasonably cheap due to kmalloc caches.
    1367                 :            :          */
    1368                 :            : 
    1369                 :            :         /* Prefer to report transient allocation failure rather than hit oom */
    1370                 :          0 :         jmp = bitmap_zalloc(DIV_ROUND_UP(batch_length, sizeof(u32)),
    1371                 :            :                             GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
    1372         [ #  # ]:          0 :         if (!jmp)
    1373                 :          0 :                 return ERR_PTR(-ENOMEM);
    1374                 :            : 
    1375                 :            :         return jmp;
    1376                 :            : }
    1377                 :            : 
    1378                 :            : #define LENGTH_BIAS 2
    1379                 :            : 
    1380                 :          0 : static bool shadow_needs_clflush(struct drm_i915_gem_object *obj)
    1381                 :            : {
    1382                 :          0 :         return !(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE);
    1383                 :            : }
    1384                 :            : 
    1385                 :            : /**
    1386                 :            :  * intel_engine_cmd_parser() - parse a batch buffer for privilege violations
    1387                 :            :  * @engine: the engine on which the batch is to execute
    1388                 :            :  * @batch: the batch buffer in question
    1389                 :            :  * @batch_offset: byte offset in the batch at which execution starts
    1390                 :            :  * @batch_length: length of the commands in batch_obj
    1391                 :            :  * @shadow: validated copy of the batch buffer in question
    1392                 :            :  * @trampoline: whether to emit a conditional trampoline at the end of the batch
    1393                 :            :  *
    1394                 :            :  * Parses the specified batch buffer looking for privilege violations as
    1395                 :            :  * described in the overview.
    1396                 :            :  *
    1397                 :            :  * Return: non-zero if the parser finds violations or otherwise fails; -EACCES
    1398                 :            :  * if the batch appears legal but should use hardware parsing
    1399                 :            :  */
    1400                 :          0 : int intel_engine_cmd_parser(struct intel_engine_cs *engine,
    1401                 :            :                             struct i915_vma *batch,
    1402                 :            :                             u32 batch_offset,
    1403                 :            :                             u32 batch_length,
    1404                 :            :                             struct i915_vma *shadow,
    1405                 :            :                             bool trampoline)
    1406                 :            : {
    1407                 :          0 :         u32 *cmd, *batch_end, offset = 0;
    1408                 :          0 :         struct drm_i915_cmd_descriptor default_desc = noop_desc;
    1409                 :          0 :         const struct drm_i915_cmd_descriptor *desc = &default_desc;
    1410                 :          0 :         unsigned long *jump_whitelist;
    1411                 :          0 :         u64 batch_addr, shadow_addr;
    1412                 :          0 :         int ret = 0;
    1413                 :            : 
    1414                 :          0 :         GEM_BUG_ON(!IS_ALIGNED(batch_offset, sizeof(*cmd)));
    1415                 :          0 :         GEM_BUG_ON(!IS_ALIGNED(batch_length, sizeof(*cmd)));
    1416                 :          0 :         GEM_BUG_ON(range_overflows_t(u64, batch_offset, batch_length,
    1417                 :            :                                      batch->size));
    1418                 :          0 :         GEM_BUG_ON(!batch_length);
    1419                 :            : 
    1420                 :          0 :         cmd = copy_batch(shadow->obj, batch->obj, batch_offset, batch_length);
    1421         [ #  # ]:          0 :         if (IS_ERR(cmd)) {
    1422                 :          0 :                 DRM_DEBUG("CMD: Failed to copy batch\n");
    1423                 :          0 :                 return PTR_ERR(cmd);
    1424                 :            :         }
    1425                 :            : 
    1426                 :          0 :         jump_whitelist = NULL;
    1427         [ #  # ]:          0 :         if (!trampoline)
    1428                 :            :                 /* Defer failure until attempted use */
    1429                 :          0 :                 jump_whitelist = alloc_whitelist(batch_length);
    1430                 :            : 
    1431                 :          0 :         shadow_addr = gen8_canonical_addr(shadow->node.start);
    1432                 :          0 :         batch_addr = gen8_canonical_addr(batch->node.start + batch_offset);
    1433                 :            : 
    1434                 :            :         /*
    1435                 :            :          * We use the batch length as size because the shadow object is as
    1436                 :            :          * large or larger and copy_batch() will write MI_NOPs to the extra
    1437                 :            :          * space. Parsing should be faster in some cases this way.
    1438                 :            :          */
    1439                 :          0 :         batch_end = cmd + batch_length / sizeof(*batch_end);
    1440                 :          0 :         do {
    1441                 :          0 :                 u32 length;
    1442                 :            : 
    1443         [ #  # ]:          0 :                 if (*cmd == MI_BATCH_BUFFER_END)
    1444                 :            :                         break;
    1445                 :            : 
    1446                 :          0 :                 desc = find_cmd(engine, *cmd, desc, &default_desc);
    1447         [ #  # ]:          0 :                 if (!desc) {
    1448                 :          0 :                         DRM_DEBUG("CMD: Unrecognized command: 0x%08X\n", *cmd);
    1449                 :          0 :                         ret = -EINVAL;
    1450                 :          0 :                         break;
    1451                 :            :                 }
    1452                 :            : 
    1453         [ #  # ]:          0 :                 if (desc->flags & CMD_DESC_FIXED)
    1454                 :          0 :                         length = desc->length.fixed;
    1455                 :            :                 else
    1456                 :          0 :                         length = (*cmd & desc->length.mask) + LENGTH_BIAS;
    1457                 :            : 
    1458         [ #  # ]:          0 :                 if ((batch_end - cmd) < length) {
    1459                 :          0 :                         DRM_DEBUG("CMD: Command length exceeds batch length: 0x%08X length=%u batchlen=%td\n",
    1460                 :            :                                   *cmd,
    1461                 :            :                                   length,
    1462                 :            :                                   batch_end - cmd);
    1463                 :          0 :                         ret = -EINVAL;
    1464                 :          0 :                         break;
    1465                 :            :                 }
    1466                 :            : 
    1467         [ #  # ]:          0 :                 if (!check_cmd(engine, desc, cmd, length)) {
    1468                 :            :                         ret = -EACCES;
    1469                 :            :                         break;
    1470                 :            :                 }
    1471                 :            : 
    1472         [ #  # ]:          0 :                 if (desc->cmd.value == MI_BATCH_BUFFER_START) {
    1473                 :          0 :                         ret = check_bbstart(cmd, offset, length, batch_length,
    1474                 :            :                                             batch_addr, shadow_addr,
    1475                 :            :                                             jump_whitelist);
    1476                 :          0 :                         break;
    1477                 :            :                 }
    1478                 :            : 
    1479   [ #  #  #  # ]:          0 :                 if (!IS_ERR_OR_NULL(jump_whitelist))
    1480                 :          0 :                         __set_bit(offset, jump_whitelist);
    1481                 :            : 
    1482                 :          0 :                 cmd += length;
    1483                 :          0 :                 offset += length;
    1484         [ #  # ]:          0 :                 if  (cmd >= batch_end) {
    1485                 :          0 :                         DRM_DEBUG("CMD: Got to the end of the buffer w/o a BBE cmd!\n");
    1486                 :          0 :                         ret = -EINVAL;
    1487                 :          0 :                         break;
    1488                 :            :                 }
    1489                 :            :         } while (1);
    1490                 :            : 
    1491         [ #  # ]:          0 :         if (trampoline) {
    1492                 :            :                 /*
    1493                 :            :                  * With the trampoline, the shadow is executed twice.
    1494                 :            :                  *
    1495                 :            :                  *   1 - starting at offset 0, in privileged mode
    1496                 :            :                  *   2 - starting at offset batch_len, as non-privileged
    1497                 :            :                  *
    1498                 :            :                  * Only if the batch is valid and safe to execute, do we
    1499                 :            :                  * allow the first privileged execution to proceed. If not,
    1500                 :            :                  * we terminate the first batch and use the second batchbuffer
    1501                 :            :                  * entry to chain to the original unsafe non-privileged batch,
    1502                 :            :                  * leaving it to the HW to validate.
    1503                 :            :                  */
    1504                 :          0 :                 *batch_end = MI_BATCH_BUFFER_END;
    1505                 :            : 
    1506         [ #  # ]:          0 :                 if (ret) {
    1507                 :            :                         /* Batch unsafe to execute with privileges, cancel! */
    1508                 :          0 :                         cmd = page_mask_bits(shadow->obj->mm.mapping);
    1509                 :          0 :                         *cmd = MI_BATCH_BUFFER_END;
    1510                 :            : 
    1511                 :            :                         /* If batch is unsafe but valid, jump to the original */
    1512         [ #  # ]:          0 :                         if (ret == -EACCES) {
    1513                 :          0 :                                 unsigned int flags;
    1514                 :            : 
    1515                 :          0 :                                 flags = MI_BATCH_NON_SECURE_I965;
    1516         [ #  # ]:          0 :                                 if (IS_HASWELL(engine->i915))
    1517                 :          0 :                                         flags = MI_BATCH_NON_SECURE_HSW;
    1518                 :            : 
    1519                 :          0 :                                 GEM_BUG_ON(!IS_GEN_RANGE(engine->i915, 6, 7));
    1520                 :          0 :                                 __gen6_emit_bb_start(batch_end,
    1521                 :            :                                                      batch_addr,
    1522                 :            :                                                      flags);
    1523                 :            : 
    1524                 :          0 :                                 ret = 0; /* allow execution */
    1525                 :            :                         }
    1526                 :            :                 }
    1527                 :            : 
    1528         [ #  # ]:          0 :                 if (shadow_needs_clflush(shadow->obj))
    1529                 :          0 :                         drm_clflush_virt_range(batch_end, 8);
    1530                 :            :         }
    1531                 :            : 
    1532         [ #  # ]:          0 :         if (shadow_needs_clflush(shadow->obj)) {
    1533                 :          0 :                 void *ptr = page_mask_bits(shadow->obj->mm.mapping);
    1534                 :            : 
    1535                 :          0 :                 drm_clflush_virt_range(ptr, (void *)(cmd + 1) - ptr);
    1536                 :            :         }
    1537                 :            : 
    1538   [ #  #  #  # ]:          0 :         if (!IS_ERR_OR_NULL(jump_whitelist))
    1539                 :          0 :                 kfree(jump_whitelist);
    1540                 :          0 :         i915_gem_object_unpin_map(shadow->obj);
    1541                 :          0 :         return ret;
    1542                 :            : }
    1543                 :            : 
    1544                 :            : /**
    1545                 :            :  * i915_cmd_parser_get_version() - get the cmd parser version number
    1546                 :            :  * @dev_priv: i915 device private
    1547                 :            :  *
    1548                 :            :  * The cmd parser maintains a simple increasing integer version number suitable
    1549                 :            :  * for passing to userspace clients to determine what operations are permitted.
    1550                 :            :  *
    1551                 :            :  * Return: the current version number of the cmd parser
    1552                 :            :  */
    1553                 :          0 : int i915_cmd_parser_get_version(struct drm_i915_private *dev_priv)
    1554                 :            : {
    1555                 :          0 :         struct intel_engine_cs *engine;
    1556                 :          0 :         bool active = false;
    1557                 :            : 
    1558                 :            :         /* If the command parser is not enabled, report 0 - unsupported */
    1559   [ #  #  #  #  :          0 :         for_each_uabi_engine(engine, dev_priv) {
                   #  # ]
    1560         [ #  # ]:          0 :                 if (intel_engine_using_cmd_parser(engine)) {
    1561                 :            :                         active = true;
    1562                 :            :                         break;
    1563                 :            :                 }
    1564                 :            :         }
    1565         [ #  # ]:          0 :         if (!active)
    1566                 :          0 :                 return 0;
    1567                 :            : 
    1568                 :            :         /*
    1569                 :            :          * Command parser version history
    1570                 :            :          *
    1571                 :            :          * 1. Initial version. Checks batches and reports violations, but leaves
    1572                 :            :          *    hardware parsing enabled (so does not allow new use cases).
    1573                 :            :          * 2. Allow access to the MI_PREDICATE_SRC0 and
    1574                 :            :          *    MI_PREDICATE_SRC1 registers.
    1575                 :            :          * 3. Allow access to the GPGPU_THREADS_DISPATCHED register.
    1576                 :            :          * 4. L3 atomic chicken bits of HSW_SCRATCH1 and HSW_ROW_CHICKEN3.
    1577                 :            :          * 5. GPGPU dispatch compute indirect registers.
    1578                 :            :          * 6. TIMESTAMP register and Haswell CS GPR registers
    1579                 :            :          * 7. Allow MI_LOAD_REGISTER_REG between whitelisted registers.
    1580                 :            :          * 8. Don't report cmd_check() failures as EINVAL errors to userspace;
    1581                 :            :          *    rely on the HW to NOOP disallowed commands as it would without
    1582                 :            :          *    the parser enabled.
    1583                 :            :          * 9. Don't whitelist or handle oacontrol specially, as ownership
    1584                 :            :          *    for oacontrol state is moving to i915-perf.
    1585                 :            :          * 10. Support for Gen9 BCS Parsing
    1586                 :            :          */
    1587                 :            :         return 10;
    1588                 :            : }

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