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         spin_lock_init(&sa_manager->lock);
  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 static bool radeon_sa_bo_next_hole(struct radeon_sa_manager *sa_manager,
 215                                    struct radeon_fence **fences,
 216                                    unsigned *tries)
 217 {
 218         struct radeon_sa_bo *best_bo = NULL;
 219         unsigned i, soffset, best, tmp;
 220
 221         /* if hole points to the end of the buffer */
 222         if (sa_manager->hole->next == &sa_manager->olist) {
 223                 /* try again with its beginning */
 224                 sa_manager->hole = &sa_manager->olist;
 225                 return true;
 226         }
 227
 228         soffset = radeon_sa_bo_hole_soffset(sa_manager);
 229         /* to handle wrap around we add sa_manager->size */
 230         best = sa_manager->size * 2;
 231         /* go over all fence list and try to find the closest sa_bo
 232          * of the current last
 233          */
 234         for (i = 0; i < RADEON_NUM_RINGS; ++i) {
 235                 struct radeon_sa_bo *sa_bo;
 236
 237                 if (list_empty(&sa_manager->flist[i])) {
 238                         continue;
 239                 }
 240
 241                 sa_bo = list_first_entry(&sa_manager->flist[i],
 242                                          struct radeon_sa_bo, flist);
 243
 244                 if (!radeon_fence_signaled(sa_bo->fence)) {
 245                         fences[i] = sa_bo->fence;
 246                         continue;
 247                 }
 248
 249                 /* limit the number of tries each ring gets */
 250                 if (tries[i] > 2) {
 251                         continue;
 252                 }
 253
 254                 tmp = sa_bo->soffset;
 255                 if (tmp < soffset) {
 256                         /* wrap around, pretend it's after */
 257                         tmp += sa_manager->size;
 258                 }
 259                 tmp -= soffset;
 260                 if (tmp < best) {
 261                         /* this sa bo is the closest one */
 262                         best = tmp;
 263                         best_bo = sa_bo;
 264                 }
 265         }
 266
 267         if (best_bo) {
 268                 ++tries[best_bo->fence->ring];
 269                 sa_manager->hole = best_bo->olist.prev;
 270
 271                 /* we knew that this one is signaled,
 272                    so it's save to remote it */
 273                 radeon_sa_bo_remove_locked(best_bo);
 274                 return true;
 275         }
 276         return false;
 277 }
 278
 279 int radeon_sa_bo_new(struct radeon_device *rdev,
 280                      struct radeon_sa_manager *sa_manager,
 281                      struct radeon_sa_bo **sa_bo,
 282                      unsigned size, unsigned align, bool block)
 283 {
 284         struct radeon_fence *fences[RADEON_NUM_RINGS];
 285         unsigned tries[RADEON_NUM_RINGS];
 286         int i, r = -ENOMEM;
 287
 288         BUG_ON(align > RADEON_GPU_PAGE_SIZE);
 289         BUG_ON(size > sa_manager->size);
 290
 291         *sa_bo = kmalloc(sizeof(struct radeon_sa_bo), GFP_KERNEL);
 292         if ((*sa_bo) == NULL) {
 293                 return -ENOMEM;
 294         }
 295         (*sa_bo)->manager = sa_manager;
 296         (*sa_bo)->fence = NULL;
 297         INIT_LIST_HEAD(&(*sa_bo)->olist);
 298         INIT_LIST_HEAD(&(*sa_bo)->flist);
 299
 300         spin_lock(&sa_manager->lock);
 301         do {
 302                 for (i = 0; i < RADEON_NUM_RINGS; ++i) {
 303                         fences[i] = NULL;
 304                         tries[i] = 0;
 305                 }
 306
 307                 do {
 308                         radeon_sa_bo_try_free(sa_manager);
 309
 310                         if (radeon_sa_bo_try_alloc(sa_manager, *sa_bo,
 311                                                    size, align)) {
 312                                 spin_unlock(&sa_manager->lock);
 313                                 return 0;
 314                         }
 315
 316                         /* see if we can skip over some allocations */
 317                 } while (radeon_sa_bo_next_hole(sa_manager, fences, tries));
 318
 319                 if (block) {
 320                         spin_unlock(&sa_manager->lock);
 321                         r = radeon_fence_wait_any(rdev, fences, false);
 322                         spin_lock(&sa_manager->lock);
 323                         if (r) {
 324                                 /* if we have nothing to wait for we
 325                                    are practically out of memory */
 326                                 if (r == -ENOENT) {
 327                                         r = -ENOMEM;
 328                                 }
 329                                 goto out_err;
 330                         }
 331                 }
 332         } while (block);
 333
 334 out_err:
 335         spin_unlock(&sa_manager->lock);
 336         kfree(*sa_bo);
 337         *sa_bo = NULL;
 338         return r;
 339 }
 340
 341 void radeon_sa_bo_free(struct radeon_device *rdev, struct radeon_sa_bo **sa_bo,
 342                        struct radeon_fence *fence)
 343 {
 344         struct radeon_sa_manager *sa_manager;
 345
 346         if (sa_bo == NULL || *sa_bo == NULL) {
 347                 return;
 348         }
 349
 350         sa_manager = (*sa_bo)->manager;
 351         spin_lock(&sa_manager->lock);
 352         if (fence && fence->seq && fence->seq < RADEON_FENCE_NOTEMITED_SEQ) {
 353                 (*sa_bo)->fence = radeon_fence_ref(fence);
 354                 list_add_tail(&(*sa_bo)->flist,
 355                               &sa_manager->flist[fence->ring]);
 356         } else {
 357                 radeon_sa_bo_remove_locked(*sa_bo);
 358         }
 359         spin_unlock(&sa_manager->lock);
 360         *sa_bo = NULL;
 361 }
 362
 363 #if defined(CONFIG_DEBUG_FS)
 364 void radeon_sa_bo_dump_debug_info(struct radeon_sa_manager *sa_manager,
 365                                   struct seq_file *m)
 366 {
 367         struct radeon_sa_bo *i;
 368
 369         spin_lock(&sa_manager->lock);
 370         list_for_each_entry(i, &sa_manager->olist, olist) {
 371                 if (&i->olist == sa_manager->hole) {
 372                         seq_printf(m, ">");
 373                 } else {
 374                         seq_printf(m, " ");
 375                 }
 376                 seq_printf(m, "[0x%08x 0x%08x] size %8d",
 377                            i->soffset, i->eoffset, i->eoffset - i->soffset);
 378                 if (i->fence) {
 379                         seq_printf(m, " protected by 0x%016llx on ring %d",
 380                                    i->fence->seq, i->fence->ring);
 381                 }
 382                 seq_printf(m, "\n");
 383         }
 384         spin_unlock(&sa_manager->lock);
 385 }
 386 #endif