Bug Summary

File:radeon/radeon_cs_gem.c
Location:line 342, column 5
Description:Value stored to 'root' is never read

Annotated Source Code

1/*
2 * Copyright © 2008 Jérôme Glisse
3 * All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining
6 * a copy of this software and associated documentation files (the
7 * "Software"), to deal in the Software without restriction, including
8 * without limitation the rights to use, copy, modify, merge, publish,
9 * distribute, sub license, and/or sell copies of the Software, and to
10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
12 *
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
14 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
15 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
16 * NON-INFRINGEMENT. IN NO EVENT SHALL THE COPYRIGHT HOLDERS, AUTHORS
17 * AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
20 * USE OR OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * The above copyright notice and this permission notice (including the
23 * next paragraph) shall be included in all copies or substantial portions
24 * of the Software.
25 */
26/*
27 * Authors:
28 * Aapo Tahkola <aet@rasterburn.org>
29 * Nicolai Haehnle <prefect_@gmx.net>
30 * Jérôme Glisse <glisse@freedesktop.org>
31 */
32#include <assert.h>
33#include <errno(*__errno_location ()).h>
34#include <stdlib.h>
35#include <string.h>
36#include <pthread.h>
37#include <sys/mman.h>
38#include <sys/ioctl.h>
39#include "radeon_cs.h"
40#include "radeon_cs_int.h"
41#include "radeon_bo_int.h"
42#include "radeon_cs_gem.h"
43#include "radeon_bo_gem.h"
44#include "drm.h"
45#include "xf86drm.h"
46#include "xf86atomic.h"
47#include "radeon_drm.h"
48#include "bof.h"
49
50#define CS_BOF_DUMP0 0
51
52struct radeon_cs_manager_gem {
53 struct radeon_cs_manager base;
54 uint32_t device_id;
55 unsigned nbof;
56};
57
58#pragma pack(1)
59struct cs_reloc_gem {
60 uint32_t handle;
61 uint32_t read_domain;
62 uint32_t write_domain;
63 uint32_t flags;
64};
65
66#pragma pack()
67#define RELOC_SIZE(sizeof(struct cs_reloc_gem) / sizeof(uint32_t)) (sizeof(struct cs_reloc_gem) / sizeof(uint32_t))
68
69struct cs_gem {
70 struct radeon_cs_int base;
71 struct drm_radeon_cs cs;
72 struct drm_radeon_cs_chunk chunks[2];
73 unsigned nrelocs;
74 uint32_t *relocs;
75 struct radeon_bo_int **relocs_bo;
76};
77
78static pthread_mutex_t id_mutex = PTHREAD_MUTEX_INITIALIZER{ { 0, 0, 0, 0, 0, { 0 } } };
79static uint32_t cs_id_source = 0;
80
81/**
82 * result is undefined if called with ~0
83 */
84static uint32_t get_first_zero(const uint32_t n)
85{
86 /* __builtin_ctz returns number of trailing zeros. */
87 return 1 << __builtin_ctz(~n);
88}
89
90/**
91 * Returns a free id for cs.
92 * If there is no free id we return zero
93 **/
94static uint32_t generate_id(void)
95{
96 uint32_t r = 0;
97 pthread_mutex_lock( &id_mutex );
98 /* check for free ids */
99 if (cs_id_source != ~r) {
100 /* find first zero bit */
101 r = get_first_zero(cs_id_source);
102
103 /* set id as reserved */
104 cs_id_source |= r;
105 }
106 pthread_mutex_unlock( &id_mutex );
107 return r;
108}
109
110/**
111 * Free the id for later reuse
112 **/
113static void free_id(uint32_t id)
114{
115 pthread_mutex_lock( &id_mutex );
116
117 cs_id_source &= ~id;
118
119 pthread_mutex_unlock( &id_mutex );
120}
121
122static struct radeon_cs_int *cs_gem_create(struct radeon_cs_manager *csm,
123 uint32_t ndw)
124{
125 struct cs_gem *csg;
126
127 /* max cmd buffer size is 64Kb */
128 if (ndw > (64 * 1024 / 4)) {
129 return NULL((void *)0);
130 }
131 csg = (struct cs_gem*)calloc(1, sizeof(struct cs_gem));
132 if (csg == NULL((void *)0)) {
133 return NULL((void *)0);
134 }
135 csg->base.csm = csm;
136 csg->base.ndw = 64 * 1024 / 4;
137 csg->base.packets = (uint32_t*)calloc(1, 64 * 1024);
138 if (csg->base.packets == NULL((void *)0)) {
139 free(csg);
140 return NULL((void *)0);
141 }
142 csg->base.relocs_total_size = 0;
143 csg->base.crelocs = 0;
144 csg->base.id = generate_id();
145 csg->nrelocs = 4096 / (4 * 4) ;
146 csg->relocs_bo = (struct radeon_bo_int**)calloc(1,
147 csg->nrelocs*sizeof(void*));
148 if (csg->relocs_bo == NULL((void *)0)) {
149 free(csg->base.packets);
150 free(csg);
151 return NULL((void *)0);
152 }
153 csg->base.relocs = csg->relocs = (uint32_t*)calloc(1, 4096);
154 if (csg->relocs == NULL((void *)0)) {
155 free(csg->relocs_bo);
156 free(csg->base.packets);
157 free(csg);
158 return NULL((void *)0);
159 }
160 csg->chunks[0].chunk_id = RADEON_CHUNK_ID_IB0x02;
161 csg->chunks[0].length_dw = 0;
162 csg->chunks[0].chunk_data = (uint64_t)(uintptr_t)csg->base.packets;
163 csg->chunks[1].chunk_id = RADEON_CHUNK_ID_RELOCS0x01;
164 csg->chunks[1].length_dw = 0;
165 csg->chunks[1].chunk_data = (uint64_t)(uintptr_t)csg->relocs;
166 return (struct radeon_cs_int*)csg;
167}
168
169static int cs_gem_write_reloc(struct radeon_cs_int *cs,
170 struct radeon_bo *bo,
171 uint32_t read_domain,
172 uint32_t write_domain,
173 uint32_t flags)
174{
175 struct radeon_bo_int *boi = (struct radeon_bo_int *)bo;
176 struct cs_gem *csg = (struct cs_gem*)cs;
177 struct cs_reloc_gem *reloc;
178 uint32_t idx;
179 unsigned i;
180
181 assert(boi->space_accounted)((boi->space_accounted) ? (void) (0) : __assert_fail ("boi->space_accounted"
, "radeon_cs_gem.c", 181, __PRETTY_FUNCTION__));
182
183 /* check domains */
184 if ((read_domain && write_domain) || (!read_domain && !write_domain)) {
185 /* in one CS a bo can only be in read or write domain but not
186 * in read & write domain at the same sime
187 */
188 return -EINVAL22;
189 }
190 if (read_domain == RADEON_GEM_DOMAIN_CPU0x1) {
191 return -EINVAL22;
192 }
193 if (write_domain == RADEON_GEM_DOMAIN_CPU0x1) {
194 return -EINVAL22;
195 }
196 /* use bit field hash function to determine
197 if this bo is for sure not in this cs.*/
198 if ((atomic_read((atomic_t *)radeon_gem_get_reloc_in_cs(bo))(((atomic_t *)radeon_gem_get_reloc_in_cs(bo))->atomic) & cs->id)) {
199 /* check if bo is already referenced.
200 * Scanning from end to begin reduces cycles with mesa because
201 * it often relocates same shared dma bo again. */
202 for(i = cs->crelocs; i != 0;) {
203 --i;
204 idx = i * RELOC_SIZE(sizeof(struct cs_reloc_gem) / sizeof(uint32_t));
205 reloc = (struct cs_reloc_gem*)&csg->relocs[idx];
206 if (reloc->handle == bo->handle) {
207 /* Check domains must be in read or write. As we check already
208 * checked that in argument one of the read or write domain was
209 * set we only need to check that if previous reloc as the read
210 * domain set then the read_domain should also be set for this
211 * new relocation.
212 */
213 /* the DDX expects to read and write from same pixmap */
214 if (write_domain && (reloc->read_domain & write_domain)) {
215 reloc->read_domain = 0;
216 reloc->write_domain = write_domain;
217 } else if (read_domain & reloc->write_domain) {
218 reloc->read_domain = 0;
219 } else {
220 if (write_domain != reloc->write_domain)
221 return -EINVAL22;
222 if (read_domain != reloc->read_domain)
223 return -EINVAL22;
224 }
225
226 reloc->read_domain |= read_domain;
227 reloc->write_domain |= write_domain;
228 /* update flags */
229 reloc->flags |= (flags & reloc->flags);
230 /* write relocation packet */
231 radeon_cs_write_dword((struct radeon_cs *)cs, 0xc0001000);
232 radeon_cs_write_dword((struct radeon_cs *)cs, idx);
233 return 0;
234 }
235 }
236 }
237 /* new relocation */
238 if (csg->base.crelocs >= csg->nrelocs) {
239 /* allocate more memory (TODO: should use a slab allocatore maybe) */
240 uint32_t *tmp, size;
241 size = ((csg->nrelocs + 1) * sizeof(struct radeon_bo*));
242 tmp = (uint32_t*)realloc(csg->relocs_bo, size);
243 if (tmp == NULL((void *)0)) {
244 return -ENOMEM12;
245 }
246 csg->relocs_bo = (struct radeon_bo_int **)tmp;
247 size = ((csg->nrelocs + 1) * RELOC_SIZE(sizeof(struct cs_reloc_gem) / sizeof(uint32_t)) * 4);
248 tmp = (uint32_t*)realloc(csg->relocs, size);
249 if (tmp == NULL((void *)0)) {
250 return -ENOMEM12;
251 }
252 cs->relocs = csg->relocs = tmp;
253 csg->nrelocs += 1;
254 csg->chunks[1].chunk_data = (uint64_t)(uintptr_t)csg->relocs;
255 }
256 csg->relocs_bo[csg->base.crelocs] = boi;
257 idx = (csg->base.crelocs++) * RELOC_SIZE(sizeof(struct cs_reloc_gem) / sizeof(uint32_t));
258 reloc = (struct cs_reloc_gem*)&csg->relocs[idx];
259 reloc->handle = bo->handle;
260 reloc->read_domain = read_domain;
261 reloc->write_domain = write_domain;
262 reloc->flags = flags;
263 csg->chunks[1].length_dw += RELOC_SIZE(sizeof(struct cs_reloc_gem) / sizeof(uint32_t));
264 radeon_bo_ref(bo);
265 /* bo might be referenced from another context so have to use atomic opertions */
266 atomic_add((atomic_t *)radeon_gem_get_reloc_in_cs(bo), cs->id)((void) __sync_add_and_fetch(&((atomic_t *)radeon_gem_get_reloc_in_cs
(bo))->atomic, (cs->id)));
267 cs->relocs_total_size += boi->size;
268 radeon_cs_write_dword((struct radeon_cs *)cs, 0xc0001000);
269 radeon_cs_write_dword((struct radeon_cs *)cs, idx);
270 return 0;
271}
272
273static int cs_gem_begin(struct radeon_cs_int *cs,
274 uint32_t ndw,
275 const char *file,
276 const char *func,
277 int line)
278{
279
280 if (cs->section_ndw) {
281 fprintf(stderrstderr, "CS already in a section(%s,%s,%d)\n",
282 cs->section_file, cs->section_func, cs->section_line);
283 fprintf(stderrstderr, "CS can't start section(%s,%s,%d)\n",
284 file, func, line);
285 return -EPIPE32;
286 }
287 cs->section_ndw = ndw;
288 cs->section_cdw = 0;
289 cs->section_file = file;
290 cs->section_func = func;
291 cs->section_line = line;
292
293 if (cs->cdw + ndw > cs->ndw) {
294 uint32_t tmp, *ptr;
295
296 /* round up the required size to a multiple of 1024 */
297 tmp = (cs->cdw + ndw + 0x3FF) & (~0x3FF);
298 ptr = (uint32_t*)realloc(cs->packets, 4 * tmp);
299 if (ptr == NULL((void *)0)) {
300 return -ENOMEM12;
301 }
302 cs->packets = ptr;
303 cs->ndw = tmp;
304 }
305 return 0;
306}
307
308static int cs_gem_end(struct radeon_cs_int *cs,
309 const char *file,
310 const char *func,
311 int line)
312
313{
314 if (!cs->section_ndw) {
315 fprintf(stderrstderr, "CS no section to end at (%s,%s,%d)\n",
316 file, func, line);
317 return -EPIPE32;
318 }
319 if (cs->section_ndw != cs->section_cdw) {
320 fprintf(stderrstderr, "CS section size missmatch start at (%s,%s,%d) %d vs %d\n",
321 cs->section_file, cs->section_func, cs->section_line, cs->section_ndw, cs->section_cdw);
322 fprintf(stderrstderr, "CS section end at (%s,%s,%d)\n",
323 file, func, line);
324
325 /* We must reset the section even when there is error. */
326 cs->section_ndw = 0;
327 return -EPIPE32;
328 }
329 cs->section_ndw = 0;
330 return 0;
331}
332
333static void cs_gem_dump_bof(struct radeon_cs_int *cs)
334{
335 struct cs_gem *csg = (struct cs_gem*)cs;
336 struct radeon_cs_manager_gem *csm;
337 bof_t *bcs, *blob, *array, *bo, *size, *handle, *device_id, *root;
338 char tmp[256];
339 unsigned i;
340
341 csm = (struct radeon_cs_manager_gem *)cs->csm;
342 root = device_id = bcs = blob = array = bo = size = handle = NULL((void *)0);
Value stored to 'root' is never read
343 root = bof_object();
344 if (root == NULL((void *)0))
345 goto out_err;
346 device_id = bof_int32(csm->device_id);
347 if (device_id == NULL((void *)0))
348 return;
349 if (bof_object_set(root, "device_id", device_id))
350 goto out_err;
351 bof_decref(device_id);
352 device_id = NULL((void *)0);
353 /* dump relocs */
354 blob = bof_blob(csg->nrelocs * 16, csg->relocs);
355 if (blob == NULL((void *)0))
356 goto out_err;
357 if (bof_object_set(root, "reloc", blob))
358 goto out_err;
359 bof_decref(blob);
360 blob = NULL((void *)0);
361 /* dump cs */
362 blob = bof_blob(cs->cdw * 4, cs->packets);
363 if (blob == NULL((void *)0))
364 goto out_err;
365 if (bof_object_set(root, "pm4", blob))
366 goto out_err;
367 bof_decref(blob);
368 blob = NULL((void *)0);
369 /* dump bo */
370 array = bof_array();
371 if (array == NULL((void *)0))
372 goto out_err;
373 for (i = 0; i < csg->base.crelocs; i++) {
374 bo = bof_object();
375 if (bo == NULL((void *)0))
376 goto out_err;
377 size = bof_int32(csg->relocs_bo[i]->size);
378 if (size == NULL((void *)0))
379 goto out_err;
380 if (bof_object_set(bo, "size", size))
381 goto out_err;
382 bof_decref(size);
383 size = NULL((void *)0);
384 handle = bof_int32(csg->relocs_bo[i]->handle);
385 if (handle == NULL((void *)0))
386 goto out_err;
387 if (bof_object_set(bo, "handle", handle))
388 goto out_err;
389 bof_decref(handle);
390 handle = NULL((void *)0);
391 radeon_bo_map((struct radeon_bo*)csg->relocs_bo[i], 0);
392 blob = bof_blob(csg->relocs_bo[i]->size, csg->relocs_bo[i]->ptr);
393 radeon_bo_unmap((struct radeon_bo*)csg->relocs_bo[i]);
394 if (blob == NULL((void *)0))
395 goto out_err;
396 if (bof_object_set(bo, "data", blob))
397 goto out_err;
398 bof_decref(blob);
399 blob = NULL((void *)0);
400 if (bof_array_append(array, bo))
401 goto out_err;
402 bof_decref(bo);
403 bo = NULL((void *)0);
404 }
405 if (bof_object_set(root, "bo", array))
406 goto out_err;
407 sprintf(tmp, "d-0x%04X-%08d.bof", csm->device_id, csm->nbof++);
408 bof_dump_file(root, tmp);
409out_err:
410 bof_decref(blob);
411 bof_decref(array);
412 bof_decref(bo);
413 bof_decref(size);
414 bof_decref(handle);
415 bof_decref(device_id);
416 bof_decref(root);
417}
418
419static int cs_gem_emit(struct radeon_cs_int *cs)
420{
421 struct cs_gem *csg = (struct cs_gem*)cs;
422 uint64_t chunk_array[2];
423 unsigned i;
424 int r;
425
426#if CS_BOF_DUMP0
427 cs_gem_dump_bof(cs);
428#endif
429 csg->chunks[0].length_dw = cs->cdw;
430
431 chunk_array[0] = (uint64_t)(uintptr_t)&csg->chunks[0];
432 chunk_array[1] = (uint64_t)(uintptr_t)&csg->chunks[1];
433
434 csg->cs.num_chunks = 2;
435 csg->cs.chunks = (uint64_t)(uintptr_t)chunk_array;
436
437 r = drmCommandWriteRead(cs->csm->fd, DRM_RADEON_CS0x26,
438 &csg->cs, sizeof(struct drm_radeon_cs));
439 for (i = 0; i < csg->base.crelocs; i++) {
440 csg->relocs_bo[i]->space_accounted = 0;
441 /* bo might be referenced from another context so have to use atomic opertions */
442 atomic_dec((atomic_t *)radeon_gem_get_reloc_in_cs((struct radeon_bo*)csg->relocs_bo[i]), cs->id)((void) __sync_sub_and_fetch(&((atomic_t *)radeon_gem_get_reloc_in_cs
((struct radeon_bo*)csg->relocs_bo[i]))->atomic, (cs->
id)));
443 radeon_bo_unref((struct radeon_bo *)csg->relocs_bo[i]);
444 csg->relocs_bo[i] = NULL((void *)0);
445 }
446
447 cs->csm->read_used = 0;
448 cs->csm->vram_write_used = 0;
449 cs->csm->gart_write_used = 0;
450 return r;
451}
452
453static int cs_gem_destroy(struct radeon_cs_int *cs)
454{
455 struct cs_gem *csg = (struct cs_gem*)cs;
456
457 free_id(cs->id);
458 free(csg->relocs_bo);
459 free(cs->relocs);
460 free(cs->packets);
461 free(cs);
462 return 0;
463}
464
465static int cs_gem_erase(struct radeon_cs_int *cs)
466{
467 struct cs_gem *csg = (struct cs_gem*)cs;
468 unsigned i;
469
470 if (csg->relocs_bo) {
471 for (i = 0; i < csg->base.crelocs; i++) {
472 if (csg->relocs_bo[i]) {
473 /* bo might be referenced from another context so have to use atomic opertions */
474 atomic_dec((atomic_t *)radeon_gem_get_reloc_in_cs((struct radeon_bo*)csg->relocs_bo[i]), cs->id)((void) __sync_sub_and_fetch(&((atomic_t *)radeon_gem_get_reloc_in_cs
((struct radeon_bo*)csg->relocs_bo[i]))->atomic, (cs->
id)));
475 radeon_bo_unref((struct radeon_bo *)csg->relocs_bo[i]);
476 csg->relocs_bo[i] = NULL((void *)0);
477 }
478 }
479 }
480 cs->relocs_total_size = 0;
481 cs->cdw = 0;
482 cs->section_ndw = 0;
483 cs->crelocs = 0;
484 csg->chunks[0].length_dw = 0;
485 csg->chunks[1].length_dw = 0;
486 return 0;
487}
488
489static int cs_gem_need_flush(struct radeon_cs_int *cs)
490{
491 return 0; //(cs->relocs_total_size > (32*1024*1024));
492}
493
494static void cs_gem_print(struct radeon_cs_int *cs, FILE *file)
495{
496 struct radeon_cs_manager_gem *csm;
497 unsigned int i;
498
499 csm = (struct radeon_cs_manager_gem *)cs->csm;
500 fprintf(file, "VENDORID:DEVICEID 0x%04X:0x%04X\n", 0x1002, csm->device_id);
501 for (i = 0; i < cs->cdw; i++) {
502 fprintf(file, "0x%08X\n", cs->packets[i]);
503 }
504}
505
506static struct radeon_cs_funcs radeon_cs_gem_funcs = {
507 cs_gem_create,
508 cs_gem_write_reloc,
509 cs_gem_begin,
510 cs_gem_end,
511 cs_gem_emit,
512 cs_gem_destroy,
513 cs_gem_erase,
514 cs_gem_need_flush,
515 cs_gem_print,
516};
517
518static int radeon_get_device_id(int fd, uint32_t *device_id)
519{
520 struct drm_radeon_info info = {};
521 int r;
522
523 *device_id = 0;
524 info.request = RADEON_INFO_DEVICE_ID0x00;
525 info.value = (uintptr_t)device_id;
526 r = drmCommandWriteRead(fd, DRM_RADEON_INFO0x27, &info,
527 sizeof(struct drm_radeon_info));
528 return r;
529}
530
531struct radeon_cs_manager *radeon_cs_manager_gem_ctor(int fd)
532{
533 struct radeon_cs_manager_gem *csm;
534
535 csm = calloc(1, sizeof(struct radeon_cs_manager_gem));
536 if (csm == NULL((void *)0)) {
537 return NULL((void *)0);
538 }
539 csm->base.funcs = &radeon_cs_gem_funcs;
540 csm->base.fd = fd;
541 radeon_get_device_id(fd, &csm->device_id);
542 return &csm->base;
543}
544
545void radeon_cs_manager_gem_dtor(struct radeon_cs_manager *csm)
546{
547 free(csm);
548}