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 <linux/slab.h>
  30 #include "drmP.h"
  31 #include "radeon_drm.h"
  32 #include "radeon_reg.h"
  33 #include "radeon.h"
  34 #include "atom.h"
  35
  36 int radeon_debugfs_ib_init(struct radeon_device *rdev);
  37
  38 void radeon_ib_bogus_cleanup(struct radeon_device *rdev)
  39 {
  40         struct radeon_ib *ib, *n;
  41
  42         list_for_each_entry_safe(ib, n, &rdev->ib_pool.bogus_ib, list) {
  43                 list_del(&ib->list);
  44                 vfree(ib->ptr);
  45                 kfree(ib);
  46         }
  47 }
  48
  49 void radeon_ib_bogus_add(struct radeon_device *rdev, struct radeon_ib *ib)
  50 {
  51         struct radeon_ib *bib;
  52
  53         bib = kmalloc(sizeof(*bib), GFP_KERNEL);
  54         if (bib == NULL)
  55                 return;
  56         bib->ptr = vmalloc(ib->length_dw * 4);
  57         if (bib->ptr == NULL) {
  58                 kfree(bib);
  59                 return;
  60         }
  61         memcpy(bib->ptr, ib->ptr, ib->length_dw * 4);
  62         bib->length_dw = ib->length_dw;
  63         mutex_lock(&rdev->ib_pool.mutex);
  64         list_add_tail(&bib->list, &rdev->ib_pool.bogus_ib);
  65         mutex_unlock(&rdev->ib_pool.mutex);
  66 }
  67
  68 /*
  69  * IB.
  70  */
  71 int radeon_ib_get(struct radeon_device *rdev, struct radeon_ib **ib)
  72 {
  73         struct radeon_fence *fence;
  74         struct radeon_ib *nib;
  75         int r = 0, i, c;
  76
  77         *ib = NULL;
  78         r = radeon_fence_create(rdev, &fence);
  79         if (r) {
  80                 dev_err(rdev->dev, "failed to create fence for new IB\n");
  81                 return r;
  82         }
  83         mutex_lock(&rdev->ib_pool.mutex);
  84         for (i = rdev->ib_pool.head_id, c = 0, nib = NULL; c < RADEON_IB_POOL_SIZE; c++, i++) {
  85                 i &= (RADEON_IB_POOL_SIZE - 1);
  86                 if (rdev->ib_pool.ibs[i].free) {
  87                         nib = &rdev->ib_pool.ibs[i];
  88                         break;
  89                 }
  90         }
  91         if (nib == NULL) {
  92                 /* This should never happen, it means we allocated all
  93                  * IB and haven't scheduled one yet, return EBUSY to
  94                  * userspace hoping that on ioctl recall we get better
  95                  * luck
  96                  */
  97                 dev_err(rdev->dev, "no free indirect buffer !\n");
  98                 mutex_unlock(&rdev->ib_pool.mutex);
  99                 radeon_fence_unref(&fence);
 100                 return -EBUSY;
 101         }
 102         rdev->ib_pool.head_id = (nib->idx + 1) & (RADEON_IB_POOL_SIZE - 1);
 103         nib->free = false;
 104         if (nib->fence) {
 105                 mutex_unlock(&rdev->ib_pool.mutex);
 106                 r = radeon_fence_wait(nib->fence, false);
 107                 if (r) {
 108                         dev_err(rdev->dev, "error waiting fence of IB(%u:0x%016lX:%u)\n",
 109                                 nib->idx, (unsigned long)nib->gpu_addr, nib->length_dw);
 110                         mutex_lock(&rdev->ib_pool.mutex);
 111                         nib->free = true;
 112                         mutex_unlock(&rdev->ib_pool.mutex);
 113                         radeon_fence_unref(&fence);
 114                         return r;
 115                 }
 116                 mutex_lock(&rdev->ib_pool.mutex);
 117         }
 118         radeon_fence_unref(&nib->fence);
 119         nib->fence = fence;
 120         nib->length_dw = 0;
 121         mutex_unlock(&rdev->ib_pool.mutex);
 122         *ib = nib;
 123         return 0;
 124 }
 125
 126 void radeon_ib_free(struct radeon_device *rdev, struct radeon_ib **ib)
 127 {
 128         struct radeon_ib *tmp = *ib;
 129
 130         *ib = NULL;
 131         if (tmp == NULL) {
 132                 return;
 133         }
 134         if (!tmp->fence->emited)
 135                 radeon_fence_unref(&tmp->fence);
 136         mutex_lock(&rdev->ib_pool.mutex);
 137         tmp->free = true;
 138         mutex_unlock(&rdev->ib_pool.mutex);
 139 }
 140
 141 int radeon_ib_schedule(struct radeon_device *rdev, struct radeon_ib *ib)
 142 {
 143         int r = 0;
 144
 145         if (!ib->length_dw || !rdev->cp.ready) {
 146                 /* TODO: Nothings in the ib we should report. */
 147                 DRM_ERROR("radeon: couldn't schedule IB(%u).\n", ib->idx);
 148                 return -EINVAL;
 149         }
 150
 151         /* 64 dwords should be enough for fence too */
 152         r = radeon_ring_lock(rdev, 64);
 153         if (r) {
 154                 DRM_ERROR("radeon: scheduling IB failed (%d).\n", r);
 155                 return r;
 156         }
 157         radeon_ring_ib_execute(rdev, ib);
 158         radeon_fence_emit(rdev, ib->fence);
 159         mutex_lock(&rdev->ib_pool.mutex);
 160         /* once scheduled IB is considered free and protected by the fence */
 161         ib->free = true;
 162         mutex_unlock(&rdev->ib_pool.mutex);
 163         radeon_ring_unlock_commit(rdev);
 164         return 0;
 165 }
 166
 167 int radeon_ib_pool_init(struct radeon_device *rdev)
 168 {
 169         void *ptr;
 170         uint64_t gpu_addr;
 171         int i;
 172         int r = 0;
 173
 174         if (rdev->ib_pool.robj)
 175                 return 0;
 176         INIT_LIST_HEAD(&rdev->ib_pool.bogus_ib);
 177         /* Allocate 1M object buffer */
 178         r = radeon_bo_create(rdev, RADEON_IB_POOL_SIZE*64*1024,
 179                              PAGE_SIZE, true, RADEON_GEM_DOMAIN_GTT,
 180                              &rdev->ib_pool.robj);
 181         if (r) {
 182                 DRM_ERROR("radeon: failed to ib pool (%d).\n", r);
 183                 return r;
 184         }
 185         r = radeon_bo_reserve(rdev->ib_pool.robj, false);
 186         if (unlikely(r != 0))
 187                 return r;
 188         r = radeon_bo_pin(rdev->ib_pool.robj, RADEON_GEM_DOMAIN_GTT, &gpu_addr);
 189         if (r) {
 190                 radeon_bo_unreserve(rdev->ib_pool.robj);
 191                 DRM_ERROR("radeon: failed to pin ib pool (%d).\n", r);
 192                 return r;
 193         }
 194         r = radeon_bo_kmap(rdev->ib_pool.robj, &ptr);
 195         radeon_bo_unreserve(rdev->ib_pool.robj);
 196         if (r) {
 197                 DRM_ERROR("radeon: failed to map ib pool (%d).\n", r);
 198                 return r;
 199         }
 200         for (i = 0; i < RADEON_IB_POOL_SIZE; i++) {
 201                 unsigned offset;
 202
 203                 offset = i * 64 * 1024;
 204                 rdev->ib_pool.ibs[i].gpu_addr = gpu_addr + offset;
 205                 rdev->ib_pool.ibs[i].ptr = ptr + offset;
 206                 rdev->ib_pool.ibs[i].idx = i;
 207                 rdev->ib_pool.ibs[i].length_dw = 0;
 208                 rdev->ib_pool.ibs[i].free = true;
 209         }
 210         rdev->ib_pool.head_id = 0;
 211         rdev->ib_pool.ready = true;
 212         DRM_INFO("radeon: ib pool ready.\n");
 213         if (radeon_debugfs_ib_init(rdev)) {
 214                 DRM_ERROR("Failed to register debugfs file for IB !\n");
 215         }
 216         return r;
 217 }
 218
 219 void radeon_ib_pool_fini(struct radeon_device *rdev)
 220 {
 221         int r;
 222         struct radeon_bo *robj;
 223
 224         if (!rdev->ib_pool.ready) {
 225                 return;
 226         }
 227         mutex_lock(&rdev->ib_pool.mutex);
 228         radeon_ib_bogus_cleanup(rdev);
 229         robj = rdev->ib_pool.robj;
 230         rdev->ib_pool.robj = NULL;
 231         mutex_unlock(&rdev->ib_pool.mutex);
 232
 233         if (robj) {
 234                 r = radeon_bo_reserve(robj, false);
 235                 if (likely(r == 0)) {
 236                         radeon_bo_kunmap(robj);
 237                         radeon_bo_unpin(robj);
 238                         radeon_bo_unreserve(robj);
 239                 }
 240                 radeon_bo_unref(&robj);
 241         }
 242 }
 243
 244
 245 /*
 246  * Ring.
 247  */
 248 void radeon_ring_free_size(struct radeon_device *rdev)
 249 {
 250         if (rdev->wb.enabled)
 251                 rdev->cp.rptr = le32_to_cpu(rdev->wb.wb[RADEON_WB_CP_RPTR_OFFSET/4]);
 252         else {
 253                 if (rdev->family >= CHIP_R600)
 254                         rdev->cp.rptr = RREG32(R600_CP_RB_RPTR);
 255                 else
 256                         rdev->cp.rptr = RREG32(RADEON_CP_RB_RPTR);
 257         }
 258         /* This works because ring_size is a power of 2 */
 259         rdev->cp.ring_free_dw = (rdev->cp.rptr + (rdev->cp.ring_size / 4));
 260         rdev->cp.ring_free_dw -= rdev->cp.wptr;
 261         rdev->cp.ring_free_dw &= rdev->cp.ptr_mask;
 262         if (!rdev->cp.ring_free_dw) {
 263                 rdev->cp.ring_free_dw = rdev->cp.ring_size / 4;
 264         }
 265 }
 266
 267 int radeon_ring_alloc(struct radeon_device *rdev, unsigned ndw)
 268 {
 269         int r;
 270
 271         /* Align requested size with padding so unlock_commit can
 272          * pad safely */
 273         ndw = (ndw + rdev->cp.align_mask) & ~rdev->cp.align_mask;
 274         while (ndw > (rdev->cp.ring_free_dw - 1)) {
 275                 radeon_ring_free_size(rdev);
 276                 if (ndw < rdev->cp.ring_free_dw) {
 277                         break;
 278                 }
 279                 r = radeon_fence_wait_next(rdev);
 280                 if (r)
 281                         return r;
 282         }
 283         rdev->cp.count_dw = ndw;
 284         rdev->cp.wptr_old = rdev->cp.wptr;
 285         return 0;
 286 }
 287
 288 int radeon_ring_lock(struct radeon_device *rdev, unsigned ndw)
 289 {
 290         int r;
 291
 292         mutex_lock(&rdev->cp.mutex);
 293         r = radeon_ring_alloc(rdev, ndw);
 294         if (r) {
 295                 mutex_unlock(&rdev->cp.mutex);
 296                 return r;
 297         }
 298         return 0;
 299 }
 300
 301 void radeon_ring_commit(struct radeon_device *rdev)
 302 {
 303         unsigned count_dw_pad;
 304         unsigned i;
 305
 306         /* We pad to match fetch size */
 307         count_dw_pad = (rdev->cp.align_mask + 1) -
 308                        (rdev->cp.wptr & rdev->cp.align_mask);
 309         for (i = 0; i < count_dw_pad; i++) {
 310                 radeon_ring_write(rdev, 2 << 30);
 311         }
 312         DRM_MEMORYBARRIER();
 313         radeon_cp_commit(rdev);
 314 }
 315
 316 void radeon_ring_unlock_commit(struct radeon_device *rdev)
 317 {
 318         radeon_ring_commit(rdev);
 319         mutex_unlock(&rdev->cp.mutex);
 320 }
 321
 322 void radeon_ring_unlock_undo(struct radeon_device *rdev)
 323 {
 324         rdev->cp.wptr = rdev->cp.wptr_old;
 325         mutex_unlock(&rdev->cp.mutex);
 326 }
 327
 328 int radeon_ring_init(struct radeon_device *rdev, unsigned ring_size)
 329 {
 330         int r;
 331
 332         rdev->cp.ring_size = ring_size;
 333         /* Allocate ring buffer */
 334         if (rdev->cp.ring_obj == NULL) {
 335                 r = radeon_bo_create(rdev, rdev->cp.ring_size, PAGE_SIZE, true,
 336                                         RADEON_GEM_DOMAIN_GTT,
 337                                         &rdev->cp.ring_obj);
 338                 if (r) {
 339                         dev_err(rdev->dev, "(%d) ring create failed\n", r);
 340                         return r;
 341                 }
 342                 r = radeon_bo_reserve(rdev->cp.ring_obj, false);
 343                 if (unlikely(r != 0))
 344                         return r;
 345                 r = radeon_bo_pin(rdev->cp.ring_obj, RADEON_GEM_DOMAIN_GTT,
 346                                         &rdev->cp.gpu_addr);
 347                 if (r) {
 348                         radeon_bo_unreserve(rdev->cp.ring_obj);
 349                         dev_err(rdev->dev, "(%d) ring pin failed\n", r);
 350                         return r;
 351                 }
 352                 r = radeon_bo_kmap(rdev->cp.ring_obj,
 353                                        (void **)&rdev->cp.ring);
 354                 radeon_bo_unreserve(rdev->cp.ring_obj);
 355                 if (r) {
 356                         dev_err(rdev->dev, "(%d) ring map failed\n", r);
 357                         return r;
 358                 }
 359         }
 360         rdev->cp.ptr_mask = (rdev->cp.ring_size / 4) - 1;
 361         rdev->cp.ring_free_dw = rdev->cp.ring_size / 4;
 362         return 0;
 363 }
 364
 365 void radeon_ring_fini(struct radeon_device *rdev)
 366 {
 367         int r;
 368         struct radeon_bo *ring_obj;
 369
 370         mutex_lock(&rdev->cp.mutex);
 371         ring_obj = rdev->cp.ring_obj;
 372         rdev->cp.ring = NULL;
 373         rdev->cp.ring_obj = NULL;
 374         mutex_unlock(&rdev->cp.mutex);
 375
 376         if (ring_obj) {
 377                 r = radeon_bo_reserve(ring_obj, false);
 378                 if (likely(r == 0)) {
 379                         radeon_bo_kunmap(ring_obj);
 380                         radeon_bo_unpin(ring_obj);
 381                         radeon_bo_unreserve(ring_obj);
 382                 }
 383                 radeon_bo_unref(&ring_obj);
 384         }
 385 }
 386
 387
 388 /*
 389  * Debugfs info
 390  */
 391 #if defined(CONFIG_DEBUG_FS)
 392 static int radeon_debugfs_ib_info(struct seq_file *m, void *data)
 393 {
 394         struct drm_info_node *node = (struct drm_info_node *) m->private;
 395         struct radeon_ib *ib = node->info_ent->data;
 396         unsigned i;
 397
 398         if (ib == NULL) {
 399                 return 0;
 400         }
 401         seq_printf(m, "IB %04u\n", ib->idx);
 402         seq_printf(m, "IB fence %p\n", ib->fence);
 403         seq_printf(m, "IB size %05u dwords\n", ib->length_dw);
 404         for (i = 0; i < ib->length_dw; i++) {
 405                 seq_printf(m, "[%05u]=0x%08X\n", i, ib->ptr[i]);
 406         }
 407         return 0;
 408 }
 409
 410 static int radeon_debugfs_ib_bogus_info(struct seq_file *m, void *data)
 411 {
 412         struct drm_info_node *node = (struct drm_info_node *) m->private;
 413         struct radeon_device *rdev = node->info_ent->data;
 414         struct radeon_ib *ib;
 415         unsigned i;
 416
 417         mutex_lock(&rdev->ib_pool.mutex);
 418         if (list_empty(&rdev->ib_pool.bogus_ib)) {
 419                 mutex_unlock(&rdev->ib_pool.mutex);
 420                 seq_printf(m, "no bogus IB recorded\n");
 421                 return 0;
 422         }
 423         ib = list_first_entry(&rdev->ib_pool.bogus_ib, struct radeon_ib, list);
 424         list_del_init(&ib->list);
 425         mutex_unlock(&rdev->ib_pool.mutex);
 426         seq_printf(m, "IB size %05u dwords\n", ib->length_dw);
 427         for (i = 0; i < ib->length_dw; i++) {
 428                 seq_printf(m, "[%05u]=0x%08X\n", i, ib->ptr[i]);
 429         }
 430         vfree(ib->ptr);
 431         kfree(ib);
 432         return 0;
 433 }
 434
 435 static struct drm_info_list radeon_debugfs_ib_list[RADEON_IB_POOL_SIZE];
 436 static char radeon_debugfs_ib_names[RADEON_IB_POOL_SIZE][32];
 437
 438 static struct drm_info_list radeon_debugfs_ib_bogus_info_list[] = {
 439         {"radeon_ib_bogus", radeon_debugfs_ib_bogus_info, 0, NULL},
 440 };
 441 #endif
 442
 443 int radeon_debugfs_ib_init(struct radeon_device *rdev)
 444 {
 445 #if defined(CONFIG_DEBUG_FS)
 446         unsigned i;
 447         int r;
 448
 449         radeon_debugfs_ib_bogus_info_list[0].data = rdev;
 450         r = radeon_debugfs_add_files(rdev, radeon_debugfs_ib_bogus_info_list, 1);
 451         if (r)
 452                 return r;
 453         for (i = 0; i < RADEON_IB_POOL_SIZE; i++) {
 454                 sprintf(radeon_debugfs_ib_names[i], "radeon_ib_%04u", i);
 455                 radeon_debugfs_ib_list[i].name = radeon_debugfs_ib_names[i];
 456                 radeon_debugfs_ib_list[i].show = &radeon_debugfs_ib_info;
 457                 radeon_debugfs_ib_list[i].driver_features = 0;
 458                 radeon_debugfs_ib_list[i].data = &rdev->ib_pool.ibs[i];
 459         }
 460         return radeon_debugfs_add_files(rdev, radeon_debugfs_ib_list,
 461                                         RADEON_IB_POOL_SIZE);
 462 #else
 463         return 0;
 464 #endif
 465 }