drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c

   1 /*
   2  * Copyright 2014 Advanced Micro Devices, 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  *    Christian König <christian.koenig@amd.com>
  29  */
  30
  31 #include <linux/firmware.h>
  32 #include <linux/module.h>
  33 #include <linux/mmu_notifier.h>
  34 #include <drm/drmP.h>
  35 #include <drm/drm.h>
  36
  37 #include "amdgpu.h"
  38
  39 struct amdgpu_mn {
  40         /* constant after initialisation */
  41         struct amdgpu_device    *adev;
  42         struct mm_struct        *mm;
  43         struct mmu_notifier     mn;
  44
  45         /* only used on destruction */
  46         struct work_struct      work;
  47
  48         /* protected by adev->mn_lock */
  49         struct hlist_node       node;
  50
  51         /* objects protected by mm->mmap_sem */
  52         struct rb_root          objects;
  53 };
  54
  55 struct amdgpu_mn_node {
  56         struct interval_tree_node       it;
  57         struct list_head                bos;
  58 };
  59
  60 /**
  61  * amdgpu_mn_destroy - destroy the rmn
  62  *
  63  * @work: previously sheduled work item
  64  *
  65  * Lazy destroys the notifier from a work item
  66  */
  67 static void amdgpu_mn_destroy(struct work_struct *work)
  68 {
  69         struct amdgpu_mn *rmn = container_of(work, struct amdgpu_mn, work);
  70         struct amdgpu_device *adev = rmn->adev;
  71         struct amdgpu_mn_node *node, *next_node;
  72         struct amdgpu_bo *bo, *next_bo;
  73
  74         mutex_lock(&adev->mn_lock);
  75         down_write(&rmn->mm->mmap_sem);
  76         hash_del(&rmn->node);
  77         rbtree_postorder_for_each_entry_safe(node, next_node, &rmn->objects,
  78                                              it.rb) {
  79                 list_for_each_entry_safe(bo, next_bo, &node->bos, mn_list) {
  80                         bo->mn = NULL;
  81                         list_del_init(&bo->mn_list);
  82                 }
  83                 kfree(node);
  84         }
  85         up_write(&rmn->mm->mmap_sem);
  86         mutex_unlock(&adev->mn_lock);
  87         mmu_notifier_unregister_no_release(&rmn->mn, rmn->mm);
  88         kfree(rmn);
  89 }
  90
  91 /**
  92  * amdgpu_mn_release - callback to notify about mm destruction
  93  *
  94  * @mn: our notifier
  95  * @mn: the mm this callback is about
  96  *
  97  * Shedule a work item to lazy destroy our notifier.
  98  */
  99 static void amdgpu_mn_release(struct mmu_notifier *mn,
 100                               struct mm_struct *mm)
 101 {
 102         struct amdgpu_mn *rmn = container_of(mn, struct amdgpu_mn, mn);
 103         INIT_WORK(&rmn->work, amdgpu_mn_destroy);
 104         schedule_work(&rmn->work);
 105 }
 106
 107 /**
 108  * amdgpu_mn_invalidate_range_start - callback to notify about mm change
 109  *
 110  * @mn: our notifier
 111  * @mn: the mm this callback is about
 112  * @start: start of updated range
 113  * @end: end of updated range
 114  *
 115  * We block for all BOs between start and end to be idle and
 116  * unmap them by move them into system domain again.
 117  */
 118 static void amdgpu_mn_invalidate_range_start(struct mmu_notifier *mn,
 119                                              struct mm_struct *mm,
 120                                              unsigned long start,
 121                                              unsigned long end)
 122 {
 123         struct amdgpu_mn *rmn = container_of(mn, struct amdgpu_mn, mn);
 124         struct interval_tree_node *it;
 125
 126         /* notification is exclusive, but interval is inclusive */
 127         end -= 1;
 128
 129         it = interval_tree_iter_first(&rmn->objects, start, end);
 130         while (it) {
 131                 struct amdgpu_mn_node *node;
 132                 struct amdgpu_bo *bo;
 133                 long r;
 134
 135                 node = container_of(it, struct amdgpu_mn_node, it);
 136                 it = interval_tree_iter_next(it, start, end);
 137
 138                 list_for_each_entry(bo, &node->bos, mn_list) {
 139
 140                         if (!amdgpu_ttm_tt_affect_userptr(bo->tbo.ttm, start,
 141                                                           end))
 142                                 continue;
 143
 144                         r = amdgpu_bo_reserve(bo, true);
 145                         if (r) {
 146                                 DRM_ERROR("(%ld) failed to reserve user bo\n", r);
 147                                 continue;
 148                         }
 149
 150                         r = reservation_object_wait_timeout_rcu(bo->tbo.resv,
 151                                 true, false, MAX_SCHEDULE_TIMEOUT);
 152                         if (r <= 0)
 153                                 DRM_ERROR("(%ld) failed to wait for user bo\n", r);
 154
 155                         amdgpu_ttm_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_CPU);
 156                         r = ttm_bo_validate(&bo->tbo, &bo->placement, false, false);
 157                         if (r)
 158                                 DRM_ERROR("(%ld) failed to validate user bo\n", r);
 159
 160                         amdgpu_bo_unreserve(bo);
 161                 }
 162         }
 163 }
 164
 165 static const struct mmu_notifier_ops amdgpu_mn_ops = {
 166         .release = amdgpu_mn_release,
 167         .invalidate_range_start = amdgpu_mn_invalidate_range_start,
 168 };
 169
 170 /**
 171  * amdgpu_mn_get - create notifier context
 172  *
 173  * @adev: amdgpu device pointer
 174  *
 175  * Creates a notifier context for current->mm.
 176  */
 177 static struct amdgpu_mn *amdgpu_mn_get(struct amdgpu_device *adev)
 178 {
 179         struct mm_struct *mm = current->mm;
 180         struct amdgpu_mn *rmn;
 181         int r;
 182
 183         mutex_lock(&adev->mn_lock);
 184         down_write(&mm->mmap_sem);
 185
 186         hash_for_each_possible(adev->mn_hash, rmn, node, (unsigned long)mm)
 187                 if (rmn->mm == mm)
 188                         goto release_locks;
 189
 190         rmn = kzalloc(sizeof(*rmn), GFP_KERNEL);
 191         if (!rmn) {
 192                 rmn = ERR_PTR(-ENOMEM);
 193                 goto release_locks;
 194         }
 195
 196         rmn->adev = adev;
 197         rmn->mm = mm;
 198         rmn->mn.ops = &amdgpu_mn_ops;
 199         rmn->objects = RB_ROOT;
 200
 201         r = __mmu_notifier_register(&rmn->mn, mm);
 202         if (r)
 203                 goto free_rmn;
 204
 205         hash_add(adev->mn_hash, &rmn->node, (unsigned long)mm);
 206
 207 release_locks:
 208         up_write(&mm->mmap_sem);
 209         mutex_unlock(&adev->mn_lock);
 210
 211         return rmn;
 212
 213 free_rmn:
 214         up_write(&mm->mmap_sem);
 215         mutex_unlock(&adev->mn_lock);
 216         kfree(rmn);
 217
 218         return ERR_PTR(r);
 219 }
 220
 221 /**
 222  * amdgpu_mn_register - register a BO for notifier updates
 223  *
 224  * @bo: amdgpu buffer object
 225  * @addr: userptr addr we should monitor
 226  *
 227  * Registers an MMU notifier for the given BO at the specified address.
 228  * Returns 0 on success, -ERRNO if anything goes wrong.
 229  */
 230 int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr)
 231 {
 232         unsigned long end = addr + amdgpu_bo_size(bo) - 1;
 233         struct amdgpu_device *adev = bo->adev;
 234         struct amdgpu_mn *rmn;
 235         struct amdgpu_mn_node *node = NULL;
 236         struct list_head bos;
 237         struct interval_tree_node *it;
 238
 239         rmn = amdgpu_mn_get(adev);
 240         if (IS_ERR(rmn))
 241                 return PTR_ERR(rmn);
 242
 243         INIT_LIST_HEAD(&bos);
 244
 245         down_write(&rmn->mm->mmap_sem);
 246
 247         while ((it = interval_tree_iter_first(&rmn->objects, addr, end))) {
 248                 kfree(node);
 249                 node = container_of(it, struct amdgpu_mn_node, it);
 250                 interval_tree_remove(&node->it, &rmn->objects);
 251                 addr = min(it->start, addr);
 252                 end = max(it->last, end);
 253                 list_splice(&node->bos, &bos);
 254         }
 255
 256         if (!node) {
 257                 node = kmalloc(sizeof(struct amdgpu_mn_node), GFP_KERNEL);
 258                 if (!node) {
 259                         up_write(&rmn->mm->mmap_sem);
 260                         return -ENOMEM;
 261                 }
 262         }
 263
 264         bo->mn = rmn;
 265
 266         node->it.start = addr;
 267         node->it.last = end;
 268         INIT_LIST_HEAD(&node->bos);
 269         list_splice(&bos, &node->bos);
 270         list_add(&bo->mn_list, &node->bos);
 271
 272         interval_tree_insert(&node->it, &rmn->objects);
 273
 274         up_write(&rmn->mm->mmap_sem);
 275
 276         return 0;
 277 }
 278
 279 /**
 280  * amdgpu_mn_unregister - unregister a BO for notifier updates
 281  *
 282  * @bo: amdgpu buffer object
 283  *
 284  * Remove any registration of MMU notifier updates from the buffer object.
 285  */
 286 void amdgpu_mn_unregister(struct amdgpu_bo *bo)
 287 {
 288         struct amdgpu_device *adev = bo->adev;
 289         struct amdgpu_mn *rmn;
 290         struct list_head *head;
 291
 292         mutex_lock(&adev->mn_lock);
 293
 294         rmn = bo->mn;
 295         if (rmn == NULL) {
 296                 mutex_unlock(&adev->mn_lock);
 297                 return;
 298         }
 299
 300         down_write(&rmn->mm->mmap_sem);
 301
 302         /* save the next list entry for later */
 303         head = bo->mn_list.next;
 304
 305         bo->mn = NULL;
 306         list_del(&bo->mn_list);
 307
 308         if (list_empty(head)) {
 309                 struct amdgpu_mn_node *node;
 310                 node = container_of(head, struct amdgpu_mn_node, bos);
 311                 interval_tree_remove(&node->it, &rmn->objects);
 312                 kfree(node);
 313         }
 314
 315         up_write(&rmn->mm->mmap_sem);
 316         mutex_unlock(&adev->mn_lock);
 317 }