drivers/gpu/drm/radeon/radeon_sa.c

   1 /*
   2  * Copyright 2011 Red Hat Inc.
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * 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, EXPRESS OR
  14  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  15  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  16  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  17  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  18  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  19  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  20  *
  21  * The above copyright notice and this permission notice (including the
  22  * next paragraph) shall be included in all copies or substantial portions
  23  * of the Software.
  24  *
  25  */
  26 /*
  27  * Authors:
  28  *    Jerome Glisse <glisse@freedesktop.org>
  29  */
  30 /* Algorithm:
  31  *
  32  * We store the last allocated bo in "hole", we always try to allocate
  33  * after the last allocated bo. Principle is that in a linear GPU ring
  34  * progression was is after last is the oldest bo we allocated and thus
  35  * the first one that should no longer be in use by the GPU.
  36  *
  37  * If it's not the case we skip over the bo after last to the closest
  38  * done bo if such one exist. If none exist and we are not asked to
  39  * block we report failure to allocate.
  40  *
  41  * If we are asked to block we wait on all the oldest fence of all
  42  * rings. We just wait for any of those fence to complete.
  43  */
  44 #include "drmP.h"
  45 #include "drm.h"
  46 #include "radeon.h"
  47
  48 static void radeon_sa_bo_remove_locked(struct radeon_sa_bo *sa_bo);
  49 static void radeon_sa_bo_try_free(struct radeon_sa_manager *sa_manager);
  50
  51 int radeon_sa_bo_manager_init(struct radeon_device *rdev,
  52                               struct radeon_sa_manager *sa_manager,
  53                               unsigned size, u32 domain)
  54 {
  55         int i, r;
  56
  57         init_waitqueue_head(&sa_manager->wq);
  58         sa_manager->bo = NULL;
  59         sa_manager->size = size;
  60         sa_manager->domain = domain;
  61         sa_manager->hole = &sa_manager->olist;
  62         INIT_LIST_HEAD(&sa_manager->olist);
  63         for (i = 0; i < RADEON_NUM_RINGS; ++i) {
  64                 INIT_LIST_HEAD(&sa_manager->flist[i]);
  65         }
  66
  67         r = radeon_bo_create(rdev, size, RADEON_GPU_PAGE_SIZE, true,
  68                              RADEON_GEM_DOMAIN_CPU, NULL, &sa_manager->bo);
  69         if (r) {
  70                 dev_err(rdev->dev, "(%d) failed to allocate bo for manager\n", r);
  71                 return r;
  72         }
  73
  74         return r;
  75 }
  76
  77 void radeon_sa_bo_manager_fini(struct radeon_device *rdev,
  78                                struct radeon_sa_manager *sa_manager)
  79 {
  80         struct radeon_sa_bo *sa_bo, *tmp;
  81
  82         if (!list_empty(&sa_manager->olist)) {
  83                 sa_manager->hole = &sa_manager->olist,
  84                 radeon_sa_bo_try_free(sa_manager);
  85                 if (!list_empty(&sa_manager->olist)) {
  86                         dev_err(rdev->dev, "sa_manager is not empty, clearing anyway\n");
  87                 }
  88         }
  89         list_for_each_entry_safe(sa_bo, tmp, &sa_manager->olist, olist) {
  90                 radeon_sa_bo_remove_locked(sa_bo);
  91         }
  92         radeon_bo_unref(&sa_manager->bo);
  93         sa_manager->size = 0;
  94 }
  95
  96 int radeon_sa_bo_manager_start(struct radeon_device *rdev,
  97                                struct radeon_sa_manager *sa_manager)
  98 {
  99         int r;
 100
 101         if (sa_manager->bo == NULL) {
 102                 dev_err(rdev->dev, "no bo for sa manager\n");
 103                 return -EINVAL;
 104         }
 105
 106         /* map the buffer */
 107         r = radeon_bo_reserve(sa_manager->bo, false);
 108         if (r) {
 109                 dev_err(rdev->dev, "(%d) failed to reserve manager bo\n", r);
 110                 return r;
 111         }
 112         r = radeon_bo_pin(sa_manager->bo, sa_manager->domain, &sa_manager->gpu_addr);
 113         if (r) {
 114                 radeon_bo_unreserve(sa_manager->bo);
 115                 dev_err(rdev->dev, "(%d) failed to pin manager bo\n", r);
 116                 return r;
 117         }
 118         r = radeon_bo_kmap(sa_manager->bo, &sa_manager->cpu_ptr);
 119         radeon_bo_unreserve(sa_manager->bo);
 120         return r;
 121 }
 122
 123 int radeon_sa_bo_manager_suspend(struct radeon_device *rdev,
 124                                  struct radeon_sa_manager *sa_manager)
 125 {
 126         int r;
 127
 128         if (sa_manager->bo == NULL) {
 129                 dev_err(rdev->dev, "no bo for sa manager\n");
 130                 return -EINVAL;
 131         }
 132
 133         r = radeon_bo_reserve(sa_manager->bo, false);
 134         if (!r) {
 135                 radeon_bo_kunmap(sa_manager->bo);
 136                 radeon_bo_unpin(sa_manager->bo);
 137                 radeon_bo_unreserve(sa_manager->bo);
 138         }
 139         return r;
 140 }
 141
 142 static void radeon_sa_bo_remove_locked(struct radeon_sa_bo *sa_bo)
 143 {
 144         struct radeon_sa_manager *sa_manager = sa_bo->manager;
 145         if (sa_manager->hole == &sa_bo->olist) {
 146                 sa_manager->hole = sa_bo->olist.prev;
 147         }
 148         list_del_init(&sa_bo->olist);
 149         list_del_init(&sa_bo->flist);
 150         radeon_fence_unref(&sa_bo->fence);
 151         kfree(sa_bo);
 152 }
 153
 154 static void radeon_sa_bo_try_free(struct radeon_sa_manager *sa_manager)
 155 {
 156         struct radeon_sa_bo *sa_bo, *tmp;
 157
 158         if (sa_manager->hole->next == &sa_manager->olist)
 159                 return;
 160
 161         sa_bo = list_entry(sa_manager->hole->next, struct radeon_sa_bo, olist);
 162         list_for_each_entry_safe_from(sa_bo, tmp, &sa_manager->olist, olist) {
 163                 if (sa_bo->fence == NULL || !radeon_fence_signaled(sa_bo->fence)) {
 164                         return;
 165                 }
 166                 radeon_sa_bo_remove_locked(sa_bo);
 167         }
 168 }
 169
 170 static inline unsigned radeon_sa_bo_hole_soffset(struct radeon_sa_manager *sa_manager)
 171 {
 172         struct list_head *hole = sa_manager->hole;
 173
 174         if (hole != &sa_manager->olist) {
 175                 return list_entry(hole, struct radeon_sa_bo, olist)->eoffset;
 176         }
 177         return 0;
 178 }
 179
 180 static inline unsigned radeon_sa_bo_hole_eoffset(struct radeon_sa_manager *sa_manager)
 181 {
 182         struct list_head *hole = sa_manager->hole;
 183
 184         if (hole->next != &sa_manager->olist) {
 185                 return list_entry(hole->next, struct radeon_sa_bo, olist)->soffset;
 186         }
 187         return sa_manager->size;
 188 }
 189
 190 static bool radeon_sa_bo_try_alloc(struct radeon_sa_manager *sa_manager,
 191                                    struct radeon_sa_bo *sa_bo,
 192                                    unsigned size, unsigned align)
 193 {
 194         unsigned soffset, eoffset, wasted;
 195
 196         soffset = radeon_sa_bo_hole_soffset(sa_manager);
 197         eoffset = radeon_sa_bo_hole_eoffset(sa_manager);
 198         wasted = (align - (soffset % align)) % align;
 199
 200         if ((eoffset - soffset) >= (size + wasted)) {
 201                 soffset += wasted;
 202
 203                 sa_bo->manager = sa_manager;
 204                 sa_bo->soffset = soffset;
 205                 sa_bo->eoffset = soffset + size;
 206                 list_add(&sa_bo->olist, sa_manager->hole);
 207                 INIT_LIST_HEAD(&sa_bo->flist);
 208                 sa_manager->hole = &sa_bo->olist;
 209                 return true;
 210         }
 211         return false;
 212 }
 213
 214 /**
 215  * radeon_sa_event - Check if we can stop waiting
 216  *
 217  * @sa_manager: pointer to the sa_manager
 218  * @size: number of bytes we want to allocate
 219  * @align: alignment we need to match
 220  *
 221  * Check if either there is a fence we can wait for or
 222  * enough free memory to satisfy the allocation directly
 223  */
 224 static bool radeon_sa_event(struct radeon_sa_manager *sa_manager,
 225                             unsigned size, unsigned align)
 226 {
 227         unsigned soffset, eoffset, wasted;
 228         int i;
 229
 230         for (i = 0; i < RADEON_NUM_RINGS; ++i) {
 231                 if (!list_empty(&sa_manager->flist[i])) {
 232                         return true;
 233                 }
 234         }
 235
 236         soffset = radeon_sa_bo_hole_soffset(sa_manager);
 237         eoffset = radeon_sa_bo_hole_eoffset(sa_manager);
 238         wasted = (align - (soffset % align)) % align;
 239
 240         if ((eoffset - soffset) >= (size + wasted)) {
 241                 return true;
 242         }
 243
 244         return false;
 245 }
 246
 247 static bool radeon_sa_bo_next_hole(struct radeon_sa_manager *sa_manager,
 248                                    struct radeon_fence **fences,
 249                                    unsigned *tries)
 250 {
 251         struct radeon_sa_bo *best_bo = NULL;
 252         unsigned i, soffset, best, tmp;
 253
 254         /* if hole points to the end of the buffer */
 255         if (sa_manager->hole->next == &sa_manager->olist) {
 256                 /* try again with its beginning */
 257                 sa_manager->hole = &sa_manager->olist;
 258                 return true;
 259         }
 260
 261         soffset = radeon_sa_bo_hole_soffset(sa_manager);
 262         /* to handle wrap around we add sa_manager->size */
 263         best = sa_manager->size * 2;
 264         /* go over all fence list and try to find the closest sa_bo
 265          * of the current last
 266          */
 267         for (i = 0; i < RADEON_NUM_RINGS; ++i) {
 268                 struct radeon_sa_bo *sa_bo;
 269
 270                 if (list_empty(&sa_manager->flist[i])) {
 271                         continue;
 272                 }
 273
 274                 sa_bo = list_first_entry(&sa_manager->flist[i],
 275                                          struct radeon_sa_bo, flist);
 276
 277                 if (!radeon_fence_signaled(sa_bo->fence)) {
 278                         fences[i] = sa_bo->fence;
 279                         continue;
 280                 }
 281
 282                 /* limit the number of tries each ring gets */
 283                 if (tries[i] > 2) {
 284                         continue;
 285                 }
 286
 287                 tmp = sa_bo->soffset;
 288                 if (tmp < soffset) {
 289                         /* wrap around, pretend it's after */
 290                         tmp += sa_manager->size;
 291                 }
 292                 tmp -= soffset;
 293                 if (tmp < best) {
 294                         /* this sa bo is the closest one */
 295                         best = tmp;
 296                         best_bo = sa_bo;
 297                 }
 298         }
 299
 300         if (best_bo) {
 301                 ++tries[best_bo->fence->ring];
 302                 sa_manager->hole = best_bo->olist.prev;
 303
 304                 /* we knew that this one is signaled,
 305                    so it's save to remote it */
 306                 radeon_sa_bo_remove_locked(best_bo);
 307                 return true;
 308         }
 309         return false;
 310 }
 311
 312 int radeon_sa_bo_new(struct radeon_device *rdev,
 313                      struct radeon_sa_manager *sa_manager,
 314                      struct radeon_sa_bo **sa_bo,
 315                      unsigned size, unsigned align, bool block)
 316 {
 317         struct radeon_fence *fences[RADEON_NUM_RINGS];
 318         unsigned tries[RADEON_NUM_RINGS];
 319         int i, r = -ENOMEM;
 320
 321         BUG_ON(align > RADEON_GPU_PAGE_SIZE);
 322         BUG_ON(size > sa_manager->size);
 323
 324         *sa_bo = kmalloc(sizeof(struct radeon_sa_bo), GFP_KERNEL);
 325         if ((*sa_bo) == NULL) {
 326                 return -ENOMEM;
 327         }
 328         (*sa_bo)->manager = sa_manager;
 329         (*sa_bo)->fence = NULL;
 330         INIT_LIST_HEAD(&(*sa_bo)->olist);
 331         INIT_LIST_HEAD(&(*sa_bo)->flist);
 332
 333         spin_lock(&sa_manager->wq.lock);
 334         while(1) {
 335                 for (i = 0; i < RADEON_NUM_RINGS; ++i) {
 336                         fences[i] = NULL;
 337                         tries[i] = 0;
 338                 }
 339
 340                 do {
 341                         radeon_sa_bo_try_free(sa_manager);
 342
 343                         if (radeon_sa_bo_try_alloc(sa_manager, *sa_bo,
 344                                                    size, align)) {
 345                                 spin_unlock(&sa_manager->wq.lock);
 346                                 return 0;
 347                         }
 348
 349                         /* see if we can skip over some allocations */
 350                 } while (radeon_sa_bo_next_hole(sa_manager, fences, tries));
 351
 352                 if (!block) {
 353                         break;
 354                 }
 355
 356                 spin_unlock(&sa_manager->wq.lock);
 357                 r = radeon_fence_wait_any(rdev, fences, false);
 358                 spin_lock(&sa_manager->wq.lock);
 359                 /* if we have nothing to wait for block */
 360                 if (r == -ENOENT) {
 361                         r = wait_event_interruptible_locked(
 362                                 sa_manager->wq,
 363                                 radeon_sa_event(sa_manager, size, align)
 364                         );
 365                 }
 366                 if (r) {
 367                         goto out_err;
 368                 }
 369         };
 370
 371 out_err:
 372         spin_unlock(&sa_manager->wq.lock);
 373         kfree(*sa_bo);
 374         *sa_bo = NULL;
 375         return r;
 376 }
 377
 378 void radeon_sa_bo_free(struct radeon_device *rdev, struct radeon_sa_bo **sa_bo,
 379                        struct radeon_fence *fence)
 380 {
 381         struct radeon_sa_manager *sa_manager;
 382
 383         if (sa_bo == NULL || *sa_bo == NULL) {
 384                 return;
 385         }
 386
 387         sa_manager = (*sa_bo)->manager;
 388         spin_lock(&sa_manager->wq.lock);
 389         if (fence && !radeon_fence_signaled(fence)) {
 390                 (*sa_bo)->fence = radeon_fence_ref(fence);
 391                 list_add_tail(&(*sa_bo)->flist,
 392                               &sa_manager->flist[fence->ring]);
 393         } else {
 394                 radeon_sa_bo_remove_locked(*sa_bo);
 395         }
 396         wake_up_all_locked(&sa_manager->wq);
 397         spin_unlock(&sa_manager->wq.lock);
 398         *sa_bo = NULL;
 399 }
 400
 401 #if defined(CONFIG_DEBUG_FS)
 402 void radeon_sa_bo_dump_debug_info(struct radeon_sa_manager *sa_manager,
 403                                   struct seq_file *m)
 404 {
 405         struct radeon_sa_bo *i;
 406
 407         spin_lock(&sa_manager->wq.lock);
 408         list_for_each_entry(i, &sa_manager->olist, olist) {
 409                 if (&i->olist == sa_manager->hole) {
 410                         seq_printf(m, ">");
 411                 } else {
 412                         seq_printf(m, " ");
 413                 }
 414                 seq_printf(m, "[0x%08x 0x%08x] size %8d",
 415                            i->soffset, i->eoffset, i->eoffset - i->soffset);
 416                 if (i->fence) {
 417                         seq_printf(m, " protected by 0x%016llx on ring %d",
 418                                    i->fence->seq, i->fence->ring);
 419                 }
 420                 seq_printf(m, "\n");
 421         }
 422         spin_unlock(&sa_manager->wq.lock);
 423 }
 424 #endif