src/freedreno/ir3/ir3_shader.c

   1 /*
   2  * Copyright (C) 2014 Rob Clark <robclark@freedesktop.org>
   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 FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  *
  23  * Authors:
  24  *    Rob Clark <robclark@freedesktop.org>
  25  */
  26
  27 #include "util/u_string.h"
  28 #include "util/u_memory.h"
  29 #include "util/u_format.h"
  30
  31 #include "drm/freedreno_drmif.h"
  32
  33 #include "ir3_shader.h"
  34 #include "ir3_compiler.h"
  35 #include "ir3_nir.h"
  36
  37 int
  38 ir3_glsl_type_size(const struct glsl_type *type, bool bindless)
  39 {
  40         return glsl_count_attribute_slots(type, false);
  41 }
  42
  43 static void
  44 delete_variant(struct ir3_shader_variant *v)
  45 {
  46         if (v->ir)
  47                 ir3_destroy(v->ir);
  48         if (v->bo)
  49                 fd_bo_del(v->bo);
  50         if (v->immediates)
  51                 free(v->immediates);
  52         free(v);
  53 }
  54
  55 /* for vertex shader, the inputs are loaded into registers before the shader
  56  * is executed, so max_regs from the shader instructions might not properly
  57  * reflect the # of registers actually used, especially in case passthrough
  58  * varyings.
  59  *
  60  * Likewise, for fragment shader, we can have some regs which are passed
  61  * input values but never touched by the resulting shader (ie. as result
  62  * of dead code elimination or simply because we don't know how to turn
  63  * the reg off.
  64  */
  65 static void
  66 fixup_regfootprint(struct ir3_shader_variant *v, uint32_t gpu_id)
  67 {
  68         unsigned i;
  69
  70         for (i = 0; i < v->inputs_count; i++) {
  71                 /* skip frag inputs fetch via bary.f since their reg's are
  72                  * not written by gpu before shader starts (and in fact the
  73                  * regid's might not even be valid)
  74                  */
  75                 if (v->inputs[i].bary)
  76                         continue;
  77
  78                 /* ignore high regs that are global to all threads in a warp
  79                  * (they exist by default) (a5xx+)
  80                  */
  81                 if (v->inputs[i].regid >= regid(48,0))
  82                         continue;
  83
  84                 if (v->inputs[i].compmask) {
  85                         unsigned n = util_last_bit(v->inputs[i].compmask) - 1;
  86                         int32_t regid = v->inputs[i].regid + n;
  87                         if (v->inputs[i].half) {
  88                                 if (gpu_id < 500) {
  89                                         v->info.max_half_reg = MAX2(v->info.max_half_reg, regid >> 2);
  90                                 } else {
  91                                         v->info.max_reg = MAX2(v->info.max_reg, regid >> 3);
  92                                 }
  93                         } else {
  94                                 v->info.max_reg = MAX2(v->info.max_reg, regid >> 2);
  95                         }
  96                 }
  97         }
  98
  99         for (i = 0; i < v->outputs_count; i++) {
 100                 int32_t regid = v->outputs[i].regid + 3;
 101                 if (v->outputs[i].half) {
 102                         if (gpu_id < 500) {
 103                                 v->info.max_half_reg = MAX2(v->info.max_half_reg, regid >> 2);
 104                         } else {
 105                                 v->info.max_reg = MAX2(v->info.max_reg, regid >> 3);
 106                         }
 107                 } else {
 108                         v->info.max_reg = MAX2(v->info.max_reg, regid >> 2);
 109                 }
 110         }
 111 }
 112
 113 /* wrapper for ir3_assemble() which does some info fixup based on
 114  * shader state.  Non-static since used by ir3_cmdline too.
 115  */
 116 void * ir3_shader_assemble(struct ir3_shader_variant *v, uint32_t gpu_id)
 117 {
 118         void *bin;
 119
 120         bin = ir3_assemble(v->ir, &v->info, gpu_id);
 121         if (!bin)
 122                 return NULL;
 123
 124         if (gpu_id >= 400) {
 125                 v->instrlen = v->info.sizedwords / (2 * 16);
 126         } else {
 127                 v->instrlen = v->info.sizedwords / (2 * 4);
 128         }
 129
 130         /* NOTE: if relative addressing is used, we set constlen in
 131          * the compiler (to worst-case value) since we don't know in
 132          * the assembler what the max addr reg value can be:
 133          */
 134         v->constlen = MAX2(v->constlen, v->info.max_const + 1);
 135         debug_assert(v->constlen < 256);
 136
 137         fixup_regfootprint(v, gpu_id);
 138
 139         return bin;
 140 }
 141
 142 static void
 143 assemble_variant(struct ir3_shader_variant *v)
 144 {
 145         struct ir3_compiler *compiler = v->shader->compiler;
 146         struct shader_info *info = &v->shader->nir->info;
 147         uint32_t gpu_id = compiler->gpu_id;
 148         uint32_t sz, *bin;
 149
 150         bin = ir3_shader_assemble(v, gpu_id);
 151         sz = v->info.sizedwords * 4;
 152
 153         v->bo = fd_bo_new(compiler->dev, sz,
 154                         DRM_FREEDRENO_GEM_CACHE_WCOMBINE |
 155                         DRM_FREEDRENO_GEM_TYPE_KMEM,
 156                         "%s:%s", ir3_shader_stage(v->shader), info->name);
 157
 158         memcpy(fd_bo_map(v->bo), bin, sz);
 159
 160         if (ir3_shader_debug & IR3_DBG_DISASM) {
 161                 struct ir3_shader_key key = v->key;
 162                 printf("disassemble: type=%d, k={bp=%u,cts=%u,hp=%u}", v->type,
 163                         v->binning_pass, key.color_two_side, key.half_precision);
 164                 ir3_shader_disasm(v, bin, stdout);
 165         }
 166
 167         if (shader_debug_enabled(v->shader->type)) {
 168                 fprintf(stderr, "Native code for unnamed %s shader %s:\n",
 169                         _mesa_shader_stage_to_string(v->shader->type),
 170                         v->shader->nir->info.name);
 171                 if (v->shader->type == MESA_SHADER_FRAGMENT)
 172                         fprintf(stderr, "SIMD0\n");
 173                 ir3_shader_disasm(v, bin, stderr);
 174         }
 175
 176         free(bin);
 177
 178         /* no need to keep the ir around beyond this point: */
 179         ir3_destroy(v->ir);
 180         v->ir = NULL;
 181 }
 182
 183 static struct ir3_shader_variant *
 184 create_variant(struct ir3_shader *shader, struct ir3_shader_key *key,
 185                 bool binning_pass)
 186 {
 187         struct ir3_shader_variant *v = CALLOC_STRUCT(ir3_shader_variant);
 188         int ret;
 189
 190         if (!v)
 191                 return NULL;
 192
 193         v->id = ++shader->variant_count;
 194         v->shader = shader;
 195         v->binning_pass = binning_pass;
 196         v->key = *key;
 197         v->type = shader->type;
 198
 199         ret = ir3_compile_shader_nir(shader->compiler, v);
 200         if (ret) {
 201                 debug_error("compile failed!");
 202                 goto fail;
 203         }
 204
 205         assemble_variant(v);
 206         if (!v->bo) {
 207                 debug_error("assemble failed!");
 208                 goto fail;
 209         }
 210
 211         return v;
 212
 213 fail:
 214         delete_variant(v);
 215         return NULL;
 216 }
 217
 218 static inline struct ir3_shader_variant *
 219 shader_variant(struct ir3_shader *shader, struct ir3_shader_key *key,
 220                 bool *created)
 221 {
 222         struct ir3_shader_variant *v;
 223
 224         *created = false;
 225
 226         for (v = shader->variants; v; v = v->next)
 227                 if (ir3_shader_key_equal(key, &v->key))
 228                         return v;
 229
 230         /* compile new variant if it doesn't exist already: */
 231         v = create_variant(shader, key, false);
 232         if (v) {
 233                 v->next = shader->variants;
 234                 shader->variants = v;
 235                 *created = true;
 236         }
 237
 238         return v;
 239 }
 240
 241 struct ir3_shader_variant *
 242 ir3_shader_get_variant(struct ir3_shader *shader, struct ir3_shader_key *key,
 243                 bool binning_pass, bool *created)
 244 {
 245         struct ir3_shader_variant *v =
 246                         shader_variant(shader, key, created);
 247
 248         if (v && binning_pass) {
 249                 if (!v->binning)
 250                         v->binning = create_variant(shader, key, true);
 251                 return v->binning;
 252         }
 253
 254         return v;
 255 }
 256
 257 void
 258 ir3_shader_destroy(struct ir3_shader *shader)
 259 {
 260         struct ir3_shader_variant *v, *t;
 261         for (v = shader->variants; v; ) {
 262                 t = v;
 263                 v = v->next;
 264                 delete_variant(t);
 265         }
 266         ralloc_free(shader->nir);
 267         free(shader);
 268 }
 269
 270 struct ir3_shader *
 271 ir3_shader_from_nir(struct ir3_compiler *compiler, nir_shader *nir)
 272 {
 273         struct ir3_shader *shader = CALLOC_STRUCT(ir3_shader);
 274
 275         shader->compiler = compiler;
 276         shader->id = ++shader->compiler->shader_count;
 277         shader->type = nir->info.stage;
 278
 279         NIR_PASS_V(nir, nir_lower_io, nir_var_all, ir3_glsl_type_size,
 280                            (nir_lower_io_options)0);
 281
 282         if (nir->info.stage == MESA_SHADER_FRAGMENT) {
 283                 /* NOTE: lower load_barycentric_at_sample first, since it
 284                  * produces load_barycentric_at_offset:
 285                  */
 286                 NIR_PASS_V(nir, ir3_nir_lower_load_barycentric_at_sample);
 287                 NIR_PASS_V(nir, ir3_nir_lower_load_barycentric_at_offset);
 288
 289                 NIR_PASS_V(nir, ir3_nir_move_varying_inputs);
 290         }
 291
 292         NIR_PASS_V(nir, nir_lower_io_arrays_to_elements_no_indirects, false);
 293
 294         /* do first pass optimization, ignoring the key: */
 295         shader->nir = ir3_optimize_nir(shader, nir, NULL);
 296         if (ir3_shader_debug & IR3_DBG_DISASM) {
 297                 printf("dump nir%d: type=%d", shader->id, shader->type);
 298                 nir_print_shader(shader->nir, stdout);
 299         }
 300
 301         return shader;
 302 }
 303
 304 static void dump_reg(FILE *out, const char *name, uint32_t r)
 305 {
 306         if (r != regid(63,0))
 307                 fprintf(out, "; %s: r%d.%c\n", name, r >> 2, "xyzw"[r & 0x3]);
 308 }
 309
 310 static void dump_output(FILE *out, struct ir3_shader_variant *so,
 311                 unsigned slot, const char *name)
 312 {
 313         uint32_t regid;
 314         regid = ir3_find_output_regid(so, slot);
 315         dump_reg(out, name, regid);
 316 }
 317
 318 void
 319 ir3_shader_disasm(struct ir3_shader_variant *so, uint32_t *bin, FILE *out)
 320 {
 321         struct ir3 *ir = so->ir;
 322         struct ir3_register *reg;
 323         const char *type = ir3_shader_stage(so->shader);
 324         uint8_t regid;
 325         unsigned i;
 326
 327         for (i = 0; i < ir->ninputs; i++) {
 328                 if (!ir->inputs[i]) {
 329                         fprintf(out, "; in%d unused\n", i);
 330                         continue;
 331                 }
 332                 reg = ir->inputs[i]->regs[0];
 333                 regid = reg->num;
 334                 fprintf(out, "@in(%sr%d.%c)\tin%d\n",
 335                                 (reg->flags & IR3_REG_HALF) ? "h" : "",
 336                                 (regid >> 2), "xyzw"[regid & 0x3], i);
 337         }
 338
 339         for (i = 0; i < ir->noutputs; i++) {
 340                 if (!ir->outputs[i]) {
 341                         fprintf(out, "; out%d unused\n", i);
 342                         continue;
 343                 }
 344                 /* kill shows up as a virtual output.. skip it! */
 345                 if (is_kill(ir->outputs[i]))
 346                         continue;
 347                 reg = ir->outputs[i]->regs[0];
 348                 regid = reg->num;
 349                 fprintf(out, "@out(%sr%d.%c)\tout%d\n",
 350                                 (reg->flags & IR3_REG_HALF) ? "h" : "",
 351                                 (regid >> 2), "xyzw"[regid & 0x3], i);
 352         }
 353
 354         for (i = 0; i < so->immediates_count; i++) {
 355                 fprintf(out, "@const(c%d.x)\t", so->constbase.immediate + i);
 356                 fprintf(out, "0x%08x, 0x%08x, 0x%08x, 0x%08x\n",
 357                                 so->immediates[i].val[0],
 358                                 so->immediates[i].val[1],
 359                                 so->immediates[i].val[2],
 360                                 so->immediates[i].val[3]);
 361         }
 362
 363         disasm_a3xx(bin, so->info.sizedwords, 0, out, ir->compiler->gpu_id);
 364
 365         switch (so->type) {
 366         case MESA_SHADER_VERTEX:
 367                 fprintf(out, "; %s: outputs:", type);
 368                 for (i = 0; i < so->outputs_count; i++) {
 369                         uint8_t regid = so->outputs[i].regid;
 370                         fprintf(out, " r%d.%c (%s)",
 371                                         (regid >> 2), "xyzw"[regid & 0x3],
 372                                         gl_varying_slot_name(so->outputs[i].slot));
 373                 }
 374                 fprintf(out, "\n");
 375                 fprintf(out, "; %s: inputs:", type);
 376                 for (i = 0; i < so->inputs_count; i++) {
 377                         uint8_t regid = so->inputs[i].regid;
 378                         fprintf(out, " r%d.%c (cm=%x,il=%u,b=%u)",
 379                                         (regid >> 2), "xyzw"[regid & 0x3],
 380                                         so->inputs[i].compmask,
 381                                         so->inputs[i].inloc,
 382                                         so->inputs[i].bary);
 383                 }
 384                 fprintf(out, "\n");
 385                 break;
 386         case MESA_SHADER_FRAGMENT:
 387                 fprintf(out, "; %s: outputs:", type);
 388                 for (i = 0; i < so->outputs_count; i++) {
 389                         uint8_t regid = so->outputs[i].regid;
 390                         fprintf(out, " r%d.%c (%s)",
 391                                         (regid >> 2), "xyzw"[regid & 0x3],
 392                                         gl_frag_result_name(so->outputs[i].slot));
 393                 }
 394                 fprintf(out, "\n");
 395                 fprintf(out, "; %s: inputs:", type);
 396                 for (i = 0; i < so->inputs_count; i++) {
 397                         uint8_t regid = so->inputs[i].regid;
 398                         fprintf(out, " r%d.%c (%s,cm=%x,il=%u,b=%u)",
 399                                         (regid >> 2), "xyzw"[regid & 0x3],
 400                                         gl_varying_slot_name(so->inputs[i].slot),
 401                                         so->inputs[i].compmask,
 402                                         so->inputs[i].inloc,
 403                                         so->inputs[i].bary);
 404                 }
 405                 fprintf(out, "\n");
 406                 break;
 407         default:
 408                 /* TODO */
 409                 break;
 410         }
 411
 412         /* print generic shader info: */
 413         fprintf(out, "; %s prog %d/%d: %u instructions, %d half, %d full\n",
 414                         type, so->shader->id, so->id,
 415                         so->info.instrs_count,
 416                         so->info.max_half_reg + 1,
 417                         so->info.max_reg + 1);
 418
 419         fprintf(out, "; %d const, %u constlen\n",
 420                         so->info.max_const + 1,
 421                         so->constlen);
 422
 423         fprintf(out, "; %u (ss), %u (sy)\n", so->info.ss, so->info.sy);
 424
 425         fprintf(out, "; max_sun=%u\n", ir->max_sun);
 426
 427         /* print shader type specific info: */
 428         switch (so->type) {
 429         case MESA_SHADER_VERTEX:
 430                 dump_output(out, so, VARYING_SLOT_POS, "pos");
 431                 dump_output(out, so, VARYING_SLOT_PSIZ, "psize");
 432                 break;
 433         case MESA_SHADER_FRAGMENT:
 434                 dump_reg(out, "pos (ij_pixel)",
 435                         ir3_find_sysval_regid(so, SYSTEM_VALUE_BARYCENTRIC_PIXEL));
 436                 dump_reg(out, "pos (ij_centroid)",
 437                         ir3_find_sysval_regid(so, SYSTEM_VALUE_BARYCENTRIC_CENTROID));
 438                 dump_reg(out, "pos (ij_size)",
 439                         ir3_find_sysval_regid(so, SYSTEM_VALUE_BARYCENTRIC_SIZE));
 440                 dump_output(out, so, FRAG_RESULT_DEPTH, "posz");
 441                 if (so->color0_mrt) {
 442                         dump_output(out, so, FRAG_RESULT_COLOR, "color");
 443                 } else {
 444                         dump_output(out, so, FRAG_RESULT_DATA0, "data0");
 445                         dump_output(out, so, FRAG_RESULT_DATA1, "data1");
 446                         dump_output(out, so, FRAG_RESULT_DATA2, "data2");
 447                         dump_output(out, so, FRAG_RESULT_DATA3, "data3");
 448                         dump_output(out, so, FRAG_RESULT_DATA4, "data4");
 449                         dump_output(out, so, FRAG_RESULT_DATA5, "data5");
 450                         dump_output(out, so, FRAG_RESULT_DATA6, "data6");
 451                         dump_output(out, so, FRAG_RESULT_DATA7, "data7");
 452                 }
 453                 /* these two are hard-coded since we don't know how to
 454                  * program them to anything but all 0's...
 455                  */
 456                 if (so->frag_coord)
 457                         fprintf(out, "; fragcoord: r0.x\n");
 458                 if (so->frag_face)
 459                         fprintf(out, "; fragface: hr0.x\n");
 460                 break;
 461         default:
 462                 /* TODO */
 463                 break;
 464         }
 465
 466         fprintf(out, "\n");
 467 }
 468
 469 uint64_t
 470 ir3_shader_outputs(const struct ir3_shader *so)
 471 {
 472         return so->nir->info.outputs_written;
 473 }