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 lock */
  52         struct mutex            lock;
  53         struct rb_root          objects;
  54 };
  55
  56 struct amdgpu_mn_node {
  57         struct interval_tree_node       it;
  58         struct list_head                bos;
  59 };
  60
  61 /**
  62  * amdgpu_mn_destroy - destroy the rmn
  63  *
  64  * @work: previously sheduled work item
  65  *
  66  * Lazy destroys the notifier from a work item
  67  */
  68 static void amdgpu_mn_destroy(struct work_struct *work)
  69 {
  70         struct amdgpu_mn *rmn = container_of(work, struct amdgpu_mn, work);
  71         struct amdgpu_device *adev = rmn->adev;
  72         struct amdgpu_mn_node *node, *next_node;
  73         struct amdgpu_bo *bo, *next_bo;
  74
  75         mutex_lock(&adev->mn_lock);
  76         mutex_lock(&rmn->lock);
  77         hash_del(&rmn->node);
  78         rbtree_postorder_for_each_entry_safe(node, next_node, &rmn->objects,
  79                                              it.rb) {
  80
  81                 interval_tree_remove(&node->it, &rmn->objects);
  82                 list_for_each_entry_safe(bo, next_bo, &node->bos, mn_list) {
  83                         bo->mn = NULL;
  84                         list_del_init(&bo->mn_list);
  85                 }
  86                 kfree(node);
  87         }
  88         mutex_unlock(&rmn->lock);
  89         mutex_unlock(&adev->mn_lock);
  90         mmu_notifier_unregister(&rmn->mn, rmn->mm);
  91         kfree(rmn);
  92 }
  93
  94 /**
  95  * amdgpu_mn_release - callback to notify about mm destruction
  96  *
  97  * @mn: our notifier
  98  * @mn: the mm this callback is about
  99  *
 100  * Shedule a work item to lazy destroy our notifier.
 101  */
 102 static void amdgpu_mn_release(struct mmu_notifier *mn,
 103                               struct mm_struct *mm)
 104 {
 105         struct amdgpu_mn *rmn = container_of(mn, struct amdgpu_mn, mn);
 106         INIT_WORK(&rmn->work, amdgpu_mn_destroy);
 107         schedule_work(&rmn->work);
 108 }
 109
 110 /**
 111  * amdgpu_mn_invalidate_range_start - callback to notify about mm change
 112  *
 113  * @mn: our notifier
 114  * @mn: the mm this callback is about
 115  * @start: start of updated range
 116  * @end: end of updated range
 117  *
 118  * We block for all BOs between start and end to be idle and
 119  * unmap them by move them into system domain again.
 120  */
 121 static void amdgpu_mn_invalidate_range_start(struct mmu_notifier *mn,
 122                                              struct mm_struct *mm,
 123                                              unsigned long start,
 124                                              unsigned long end)
 125 {
 126         struct amdgpu_mn *rmn = container_of(mn, struct amdgpu_mn, mn);
 127         struct interval_tree_node *it;
 128
 129         /* notification is exclusive, but interval is inclusive */
 130         end -= 1;
 131
 132         mutex_lock(&rmn->lock);
 133
 134         it = interval_tree_iter_first(&rmn->objects, start, end);
 135         while (it) {
 136                 struct amdgpu_mn_node *node;
 137                 struct amdgpu_bo *bo;
 138                 long r;
 139
 140                 node = container_of(it, struct amdgpu_mn_node, it);
 141                 it = interval_tree_iter_next(it, start, end);
 142
 143                 list_for_each_entry(bo, &node->bos, mn_list) {
 144
 145                         if (!amdgpu_ttm_tt_affect_userptr(bo->tbo.ttm, start,
 146                                                           end))
 147                                 continue;
 148
 149                         r = amdgpu_bo_reserve(bo, true);
 150                         if (r) {
 151                                 DRM_ERROR("(%ld) failed to reserve user bo\n", r);
 152                                 continue;
 153                         }
 154
 155                         r = reservation_object_wait_timeout_rcu(bo->tbo.resv,
 156                                 true, false, MAX_SCHEDULE_TIMEOUT);
 157                         if (r <= 0)
 158                                 DRM_ERROR("(%ld) failed to wait for user bo\n", r);
 159
 160                         amdgpu_ttm_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_CPU);
 161                         r = ttm_bo_validate(&bo->tbo, &bo->placement, false, false);
 162                         if (r)
 163                                 DRM_ERROR("(%ld) failed to validate user bo\n", r);
 164
 165                         amdgpu_bo_unreserve(bo);
 166                 }
 167         }
 168
 169         mutex_unlock(&rmn->lock);
 170 }
 171
 172 static const struct mmu_notifier_ops amdgpu_mn_ops = {
 173         .release = amdgpu_mn_release,
 174         .invalidate_range_start = amdgpu_mn_invalidate_range_start,
 175 };
 176
 177 /**
 178  * amdgpu_mn_get - create notifier context
 179  *
 180  * @adev: amdgpu device pointer
 181  *
 182  * Creates a notifier context for current->mm.
 183  */
 184 static struct amdgpu_mn *amdgpu_mn_get(struct amdgpu_device *adev)
 185 {
 186         struct mm_struct *mm = current->mm;
 187         struct amdgpu_mn *rmn;
 188         int r;
 189
 190         down_write(&mm->mmap_sem);
 191         mutex_lock(&adev->mn_lock);
 192
 193         hash_for_each_possible(adev->mn_hash, rmn, node, (unsigned long)mm)
 194                 if (rmn->mm == mm)
 195                         goto release_locks;
 196
 197         rmn = kzalloc(sizeof(*rmn), GFP_KERNEL);
 198         if (!rmn) {
 199                 rmn = ERR_PTR(-ENOMEM);
 200                 goto release_locks;
 201         }
 202
 203         rmn->adev = adev;
 204         rmn->mm = mm;
 205         rmn->mn.ops = &amdgpu_mn_ops;
 206         mutex_init(&rmn->lock);
 207         rmn->objects = RB_ROOT;
 208
 209         r = __mmu_notifier_register(&rmn->mn, mm);
 210         if (r)
 211                 goto free_rmn;
 212
 213         hash_add(adev->mn_hash, &rmn->node, (unsigned long)mm);
 214
 215 release_locks:
 216         mutex_unlock(&adev->mn_lock);
 217         up_write(&mm->mmap_sem);
 218
 219         return rmn;
 220
 221 free_rmn:
 222         mutex_unlock(&adev->mn_lock);
 223         up_write(&mm->mmap_sem);
 224         kfree(rmn);
 225
 226         return ERR_PTR(r);
 227 }
 228
 229 /**
 230  * amdgpu_mn_register - register a BO for notifier updates
 231  *
 232  * @bo: amdgpu buffer object
 233  * @addr: userptr addr we should monitor
 234  *
 235  * Registers an MMU notifier for the given BO at the specified address.
 236  * Returns 0 on success, -ERRNO if anything goes wrong.
 237  */
 238 int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr)
 239 {
 240         unsigned long end = addr + amdgpu_bo_size(bo) - 1;
 241         struct amdgpu_device *adev = bo->adev;
 242         struct amdgpu_mn *rmn;
 243         struct amdgpu_mn_node *node = NULL;
 244         struct list_head bos;
 245         struct interval_tree_node *it;
 246
 247         rmn = amdgpu_mn_get(adev);
 248         if (IS_ERR(rmn))
 249                 return PTR_ERR(rmn);
 250
 251         INIT_LIST_HEAD(&bos);
 252
 253         mutex_lock(&rmn->lock);
 254
 255         while ((it = interval_tree_iter_first(&rmn->objects, addr, end))) {
 256                 kfree(node);
 257                 node = container_of(it, struct amdgpu_mn_node, it);
 258                 interval_tree_remove(&node->it, &rmn->objects);
 259                 addr = min(it->start, addr);
 260                 end = max(it->last, end);
 261                 list_splice(&node->bos, &bos);
 262         }
 263
 264         if (!node) {
 265                 node = kmalloc(sizeof(struct amdgpu_mn_node), GFP_KERNEL);
 266                 if (!node) {
 267                         mutex_unlock(&rmn->lock);
 268                         return -ENOMEM;
 269                 }
 270         }
 271
 272         bo->mn = rmn;
 273
 274         node->it.start = addr;
 275         node->it.last = end;
 276         INIT_LIST_HEAD(&node->bos);
 277         list_splice(&bos, &node->bos);
 278         list_add(&bo->mn_list, &node->bos);
 279
 280         interval_tree_insert(&node->it, &rmn->objects);
 281
 282         mutex_unlock(&rmn->lock);
 283
 284         return 0;
 285 }
 286
 287 /**
 288  * amdgpu_mn_unregister - unregister a BO for notifier updates
 289  *
 290  * @bo: amdgpu buffer object
 291  *
 292  * Remove any registration of MMU notifier updates from the buffer object.
 293  */
 294 void amdgpu_mn_unregister(struct amdgpu_bo *bo)
 295 {
 296         struct amdgpu_device *adev = bo->adev;
 297         struct amdgpu_mn *rmn;
 298         struct list_head *head;
 299
 300         mutex_lock(&adev->mn_lock);
 301         rmn = bo->mn;
 302         if (rmn == NULL) {
 303                 mutex_unlock(&adev->mn_lock);
 304                 return;
 305         }
 306
 307         mutex_lock(&rmn->lock);
 308         /* save the next list entry for later */
 309         head = bo->mn_list.next;
 310
 311         bo->mn = NULL;
 312         list_del(&bo->mn_list);
 313
 314         if (list_empty(head)) {
 315                 struct amdgpu_mn_node *node;
 316                 node = container_of(head, struct amdgpu_mn_node, bos);
 317                 interval_tree_remove(&node->it, &rmn->objects);
 318                 kfree(node);
 319         }
 320
 321         mutex_unlock(&rmn->lock);
 322         mutex_unlock(&adev->mn_lock);
 323 }