drivers/gpu/drm/radeon/radeon_ring.c

   1 /*
   2  * Copyright 2008 Advanced Micro Devices, Inc.
   3  * Copyright 2008 Red Hat Inc.
   4  * Copyright 2009 Jerome Glisse.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors: Dave Airlie
  25  *          Alex Deucher
  26  *          Jerome Glisse
  27  */
  28 #include <linux/seq_file.h>
  29 #include "drmP.h"
  30 #include "radeon_drm.h"
  31 #include "radeon_reg.h"
  32 #include "radeon.h"
  33 #include "atom.h"
  34
  35 int radeon_debugfs_ib_init(struct radeon_device *rdev);
  36
  37 void radeon_ib_bogus_cleanup(struct radeon_device *rdev)
  38 {
  39         struct radeon_ib *ib, *n;
  40
  41         list_for_each_entry_safe(ib, n, &rdev->ib_pool.bogus_ib, list) {
  42                 list_del(&ib->list);
  43                 vfree(ib->ptr);
  44                 kfree(ib);
  45         }
  46 }
  47
  48 void radeon_ib_bogus_add(struct radeon_device *rdev, struct radeon_ib *ib)
  49 {
  50         struct radeon_ib *bib;
  51
  52         bib = kmalloc(sizeof(*bib), GFP_KERNEL);
  53         if (bib == NULL)
  54                 return;
  55         bib->ptr = vmalloc(ib->length_dw * 4);
  56         if (bib->ptr == NULL) {
  57                 kfree(bib);
  58                 return;
  59         }
  60         memcpy(bib->ptr, ib->ptr, ib->length_dw * 4);
  61         bib->length_dw = ib->length_dw;
  62         mutex_lock(&rdev->ib_pool.mutex);
  63         list_add_tail(&bib->list, &rdev->ib_pool.bogus_ib);
  64         mutex_unlock(&rdev->ib_pool.mutex);
  65 }
  66
  67 /*
  68  * IB.
  69  */
  70 int radeon_ib_get(struct radeon_device *rdev, struct radeon_ib **ib)
  71 {
  72         struct radeon_fence *fence;
  73         struct radeon_ib *nib;
  74         int r = 0, i, c;
  75
  76         *ib = NULL;
  77         r = radeon_fence_create(rdev, &fence);
  78         if (r) {
  79                 dev_err(rdev->dev, "failed to create fence for new IB\n");
  80                 return r;
  81         }
  82         mutex_lock(&rdev->ib_pool.mutex);
  83         for (i = rdev->ib_pool.head_id, c = 0, nib = NULL; c < RADEON_IB_POOL_SIZE; c++, i++) {
  84                 i &= (RADEON_IB_POOL_SIZE - 1);
  85                 if (rdev->ib_pool.ibs[i].free) {
  86                         nib = &rdev->ib_pool.ibs[i];
  87                         break;
  88                 }
  89         }
  90         if (nib == NULL) {
  91                 /* This should never happen, it means we allocated all
  92                  * IB and haven't scheduled one yet, return EBUSY to
  93                  * userspace hoping that on ioctl recall we get better
  94                  * luck
  95                  */
  96                 dev_err(rdev->dev, "no free indirect buffer !\n");
  97                 mutex_unlock(&rdev->ib_pool.mutex);
  98                 radeon_fence_unref(&fence);
  99                 return -EBUSY;
 100         }
 101         rdev->ib_pool.head_id = (nib->idx + 1) & (RADEON_IB_POOL_SIZE - 1);
 102         nib->free = false;
 103         if (nib->fence) {
 104                 mutex_unlock(&rdev->ib_pool.mutex);
 105                 r = radeon_fence_wait(nib->fence, false);
 106                 if (r) {
 107                         dev_err(rdev->dev, "error waiting fence of IB(%u:0x%016lX:%u)\n",
 108                                 nib->idx, (unsigned long)nib->gpu_addr, nib->length_dw);
 109                         mutex_lock(&rdev->ib_pool.mutex);
 110                         nib->free = true;
 111                         mutex_unlock(&rdev->ib_pool.mutex);
 112                         radeon_fence_unref(&fence);
 113                         return r;
 114                 }
 115                 mutex_lock(&rdev->ib_pool.mutex);
 116         }
 117         radeon_fence_unref(&nib->fence);
 118         nib->fence = fence;
 119         nib->length_dw = 0;
 120         mutex_unlock(&rdev->ib_pool.mutex);
 121         *ib = nib;
 122         return 0;
 123 }
 124
 125 void radeon_ib_free(struct radeon_device *rdev, struct radeon_ib **ib)
 126 {
 127         struct radeon_ib *tmp = *ib;
 128
 129         *ib = NULL;
 130         if (tmp == NULL) {
 131                 return;
 132         }
 133         if (!tmp->fence->emited)
 134                 radeon_fence_unref(&tmp->fence);
 135         mutex_lock(&rdev->ib_pool.mutex);
 136         tmp->free = true;
 137         mutex_unlock(&rdev->ib_pool.mutex);
 138 }
 139
 140 int radeon_ib_schedule(struct radeon_device *rdev, struct radeon_ib *ib)
 141 {
 142         int r = 0;
 143
 144         if (!ib->length_dw || !rdev->cp.ready) {
 145                 /* TODO: Nothings in the ib we should report. */
 146                 DRM_ERROR("radeon: couldn't schedule IB(%u).\n", ib->idx);
 147                 return -EINVAL;
 148         }
 149
 150         /* 64 dwords should be enough for fence too */
 151         r = radeon_ring_lock(rdev, 64);
 152         if (r) {
 153                 DRM_ERROR("radeon: scheduling IB failled (%d).\n", r);
 154                 return r;
 155         }
 156         radeon_ring_ib_execute(rdev, ib);
 157         radeon_fence_emit(rdev, ib->fence);
 158         mutex_lock(&rdev->ib_pool.mutex);
 159         /* once scheduled IB is considered free and protected by the fence */
 160         ib->free = true;
 161         mutex_unlock(&rdev->ib_pool.mutex);
 162         radeon_ring_unlock_commit(rdev);
 163         return 0;
 164 }
 165
 166 int radeon_ib_pool_init(struct radeon_device *rdev)
 167 {
 168         void *ptr;
 169         uint64_t gpu_addr;
 170         int i;
 171         int r = 0;
 172
 173         if (rdev->ib_pool.robj)
 174                 return 0;
 175         INIT_LIST_HEAD(&rdev->ib_pool.bogus_ib);
 176         /* Allocate 1M object buffer */
 177         r = radeon_bo_create(rdev, NULL,  RADEON_IB_POOL_SIZE*64*1024,
 178                                 true, RADEON_GEM_DOMAIN_GTT,
 179                                 &rdev->ib_pool.robj);
 180         if (r) {
 181                 DRM_ERROR("radeon: failed to ib pool (%d).\n", r);
 182                 return r;
 183         }
 184         r = radeon_bo_reserve(rdev->ib_pool.robj, false);
 185         if (unlikely(r != 0))
 186                 return r;
 187         r = radeon_bo_pin(rdev->ib_pool.robj, RADEON_GEM_DOMAIN_GTT, &gpu_addr);
 188         if (r) {
 189                 radeon_bo_unreserve(rdev->ib_pool.robj);
 190                 DRM_ERROR("radeon: failed to pin ib pool (%d).\n", r);
 191                 return r;
 192         }
 193         r = radeon_bo_kmap(rdev->ib_pool.robj, &ptr);
 194         radeon_bo_unreserve(rdev->ib_pool.robj);
 195         if (r) {
 196                 DRM_ERROR("radeon: failed to map ib poll (%d).\n", r);
 197                 return r;
 198         }
 199         for (i = 0; i < RADEON_IB_POOL_SIZE; i++) {
 200                 unsigned offset;
 201
 202                 offset = i * 64 * 1024;
 203                 rdev->ib_pool.ibs[i].gpu_addr = gpu_addr + offset;
 204                 rdev->ib_pool.ibs[i].ptr = ptr + offset;
 205                 rdev->ib_pool.ibs[i].idx = i;
 206                 rdev->ib_pool.ibs[i].length_dw = 0;
 207                 rdev->ib_pool.ibs[i].free = true;
 208         }
 209         rdev->ib_pool.head_id = 0;
 210         rdev->ib_pool.ready = true;
 211         DRM_INFO("radeon: ib pool ready.\n");
 212         if (radeon_debugfs_ib_init(rdev)) {
 213                 DRM_ERROR("Failed to register debugfs file for IB !\n");
 214         }
 215         return r;
 216 }
 217
 218 void radeon_ib_pool_fini(struct radeon_device *rdev)
 219 {
 220         int r;
 221
 222         if (!rdev->ib_pool.ready) {
 223                 return;
 224         }
 225         mutex_lock(&rdev->ib_pool.mutex);
 226         radeon_ib_bogus_cleanup(rdev);
 227
 228         if (rdev->ib_pool.robj) {
 229                 r = radeon_bo_reserve(rdev->ib_pool.robj, false);
 230                 if (likely(r == 0)) {
 231                         radeon_bo_kunmap(rdev->ib_pool.robj);
 232                         radeon_bo_unpin(rdev->ib_pool.robj);
 233                         radeon_bo_unreserve(rdev->ib_pool.robj);
 234                 }
 235                 radeon_bo_unref(&rdev->ib_pool.robj);
 236                 rdev->ib_pool.robj = NULL;
 237         }
 238         mutex_unlock(&rdev->ib_pool.mutex);
 239 }
 240
 241
 242 /*
 243  * Ring.
 244  */
 245 void radeon_ring_free_size(struct radeon_device *rdev)
 246 {
 247         if (rdev->family >= CHIP_R600)
 248                 rdev->cp.rptr = RREG32(R600_CP_RB_RPTR);
 249         else
 250                 rdev->cp.rptr = RREG32(RADEON_CP_RB_RPTR);
 251         /* This works because ring_size is a power of 2 */
 252         rdev->cp.ring_free_dw = (rdev->cp.rptr + (rdev->cp.ring_size / 4));
 253         rdev->cp.ring_free_dw -= rdev->cp.wptr;
 254         rdev->cp.ring_free_dw &= rdev->cp.ptr_mask;
 255         if (!rdev->cp.ring_free_dw) {
 256                 rdev->cp.ring_free_dw = rdev->cp.ring_size / 4;
 257         }
 258 }
 259
 260 int radeon_ring_lock(struct radeon_device *rdev, unsigned ndw)
 261 {
 262         int r;
 263
 264         /* Align requested size with padding so unlock_commit can
 265          * pad safely */
 266         ndw = (ndw + rdev->cp.align_mask) & ~rdev->cp.align_mask;
 267         mutex_lock(&rdev->cp.mutex);
 268         while (ndw > (rdev->cp.ring_free_dw - 1)) {
 269                 radeon_ring_free_size(rdev);
 270                 if (ndw < rdev->cp.ring_free_dw) {
 271                         break;
 272                 }
 273                 r = radeon_fence_wait_next(rdev);
 274                 if (r) {
 275                         mutex_unlock(&rdev->cp.mutex);
 276                         return r;
 277                 }
 278         }
 279         rdev->cp.count_dw = ndw;
 280         rdev->cp.wptr_old = rdev->cp.wptr;
 281         return 0;
 282 }
 283
 284 void radeon_ring_unlock_commit(struct radeon_device *rdev)
 285 {
 286         unsigned count_dw_pad;
 287         unsigned i;
 288
 289         /* We pad to match fetch size */
 290         count_dw_pad = (rdev->cp.align_mask + 1) -
 291                        (rdev->cp.wptr & rdev->cp.align_mask);
 292         for (i = 0; i < count_dw_pad; i++) {
 293                 radeon_ring_write(rdev, 2 << 30);
 294         }
 295         DRM_MEMORYBARRIER();
 296         radeon_cp_commit(rdev);
 297         mutex_unlock(&rdev->cp.mutex);
 298 }
 299
 300 void radeon_ring_unlock_undo(struct radeon_device *rdev)
 301 {
 302         rdev->cp.wptr = rdev->cp.wptr_old;
 303         mutex_unlock(&rdev->cp.mutex);
 304 }
 305
 306 int radeon_ring_init(struct radeon_device *rdev, unsigned ring_size)
 307 {
 308         int r;
 309
 310         rdev->cp.ring_size = ring_size;
 311         /* Allocate ring buffer */
 312         if (rdev->cp.ring_obj == NULL) {
 313                 r = radeon_bo_create(rdev, NULL, rdev->cp.ring_size, true,
 314                                         RADEON_GEM_DOMAIN_GTT,
 315                                         &rdev->cp.ring_obj);
 316                 if (r) {
 317                         dev_err(rdev->dev, "(%d) ring create failed\n", r);
 318                         return r;
 319                 }
 320                 r = radeon_bo_reserve(rdev->cp.ring_obj, false);
 321                 if (unlikely(r != 0))
 322                         return r;
 323                 r = radeon_bo_pin(rdev->cp.ring_obj, RADEON_GEM_DOMAIN_GTT,
 324                                         &rdev->cp.gpu_addr);
 325                 if (r) {
 326                         radeon_bo_unreserve(rdev->cp.ring_obj);
 327                         dev_err(rdev->dev, "(%d) ring pin failed\n", r);
 328                         return r;
 329                 }
 330                 r = radeon_bo_kmap(rdev->cp.ring_obj,
 331                                        (void **)&rdev->cp.ring);
 332                 radeon_bo_unreserve(rdev->cp.ring_obj);
 333                 if (r) {
 334                         dev_err(rdev->dev, "(%d) ring map failed\n", r);
 335                         return r;
 336                 }
 337         }
 338         rdev->cp.ptr_mask = (rdev->cp.ring_size / 4) - 1;
 339         rdev->cp.ring_free_dw = rdev->cp.ring_size / 4;
 340         return 0;
 341 }
 342
 343 void radeon_ring_fini(struct radeon_device *rdev)
 344 {
 345         int r;
 346
 347         mutex_lock(&rdev->cp.mutex);
 348         if (rdev->cp.ring_obj) {
 349                 r = radeon_bo_reserve(rdev->cp.ring_obj, false);
 350                 if (likely(r == 0)) {
 351                         radeon_bo_kunmap(rdev->cp.ring_obj);
 352                         radeon_bo_unpin(rdev->cp.ring_obj);
 353                         radeon_bo_unreserve(rdev->cp.ring_obj);
 354                 }
 355                 radeon_bo_unref(&rdev->cp.ring_obj);
 356                 rdev->cp.ring = NULL;
 357                 rdev->cp.ring_obj = NULL;
 358         }
 359         mutex_unlock(&rdev->cp.mutex);
 360 }
 361
 362
 363 /*
 364  * Debugfs info
 365  */
 366 #if defined(CONFIG_DEBUG_FS)
 367 static int radeon_debugfs_ib_info(struct seq_file *m, void *data)
 368 {
 369         struct drm_info_node *node = (struct drm_info_node *) m->private;
 370         struct radeon_ib *ib = node->info_ent->data;
 371         unsigned i;
 372
 373         if (ib == NULL) {
 374                 return 0;
 375         }
 376         seq_printf(m, "IB %04u\n", ib->idx);
 377         seq_printf(m, "IB fence %p\n", ib->fence);
 378         seq_printf(m, "IB size %05u dwords\n", ib->length_dw);
 379         for (i = 0; i < ib->length_dw; i++) {
 380                 seq_printf(m, "[%05u]=0x%08X\n", i, ib->ptr[i]);
 381         }
 382         return 0;
 383 }
 384
 385 static int radeon_debugfs_ib_bogus_info(struct seq_file *m, void *data)
 386 {
 387         struct drm_info_node *node = (struct drm_info_node *) m->private;
 388         struct radeon_device *rdev = node->info_ent->data;
 389         struct radeon_ib *ib;
 390         unsigned i;
 391
 392         mutex_lock(&rdev->ib_pool.mutex);
 393         if (list_empty(&rdev->ib_pool.bogus_ib)) {
 394                 mutex_unlock(&rdev->ib_pool.mutex);
 395                 seq_printf(m, "no bogus IB recorded\n");
 396                 return 0;
 397         }
 398         ib = list_first_entry(&rdev->ib_pool.bogus_ib, struct radeon_ib, list);
 399         list_del_init(&ib->list);
 400         mutex_unlock(&rdev->ib_pool.mutex);
 401         seq_printf(m, "IB size %05u dwords\n", ib->length_dw);
 402         for (i = 0; i < ib->length_dw; i++) {
 403                 seq_printf(m, "[%05u]=0x%08X\n", i, ib->ptr[i]);
 404         }
 405         vfree(ib->ptr);
 406         kfree(ib);
 407         return 0;
 408 }
 409
 410 static struct drm_info_list radeon_debugfs_ib_list[RADEON_IB_POOL_SIZE];
 411 static char radeon_debugfs_ib_names[RADEON_IB_POOL_SIZE][32];
 412
 413 static struct drm_info_list radeon_debugfs_ib_bogus_info_list[] = {
 414         {"radeon_ib_bogus", radeon_debugfs_ib_bogus_info, 0, NULL},
 415 };
 416 #endif
 417
 418 int radeon_debugfs_ib_init(struct radeon_device *rdev)
 419 {
 420 #if defined(CONFIG_DEBUG_FS)
 421         unsigned i;
 422         int r;
 423
 424         radeon_debugfs_ib_bogus_info_list[0].data = rdev;
 425         r = radeon_debugfs_add_files(rdev, radeon_debugfs_ib_bogus_info_list, 1);
 426         if (r)
 427                 return r;
 428         for (i = 0; i < RADEON_IB_POOL_SIZE; i++) {
 429                 sprintf(radeon_debugfs_ib_names[i], "radeon_ib_%04u", i);
 430                 radeon_debugfs_ib_list[i].name = radeon_debugfs_ib_names[i];
 431                 radeon_debugfs_ib_list[i].show = &radeon_debugfs_ib_info;
 432                 radeon_debugfs_ib_list[i].driver_features = 0;
 433                 radeon_debugfs_ib_list[i].data = &rdev->ib_pool.ibs[i];
 434         }
 435         return radeon_debugfs_add_files(rdev, radeon_debugfs_ib_list,
 436                                         RADEON_IB_POOL_SIZE);
 437 #else
 438         return 0;
 439 #endif
 440 }