drivers/gpu/drm/radeon/radeon_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 "radeon.h"
  38
  39 struct radeon_mn {
  40         /* constant after initialisation */
  41         struct radeon_device    *rdev;
  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 rdev->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 /**
  57  * radeon_mn_destroy - destroy the rmn
  58  *
  59  * @work: previously sheduled work item
  60  *
  61  * Lazy destroys the notifier from a work item
  62  */
  63 static void radeon_mn_destroy(struct work_struct *work)
  64 {
  65         struct radeon_mn *rmn = container_of(work, struct radeon_mn, work);
  66         struct radeon_device *rdev = rmn->rdev;
  67         struct radeon_bo *bo, *next;
  68
  69         mutex_lock(&rdev->mn_lock);
  70         mutex_lock(&rmn->lock);
  71         hash_del(&rmn->node);
  72         rbtree_postorder_for_each_entry_safe(bo, next, &rmn->objects, mn_it.rb) {
  73                 interval_tree_remove(&bo->mn_it, &rmn->objects);
  74                 bo->mn = NULL;
  75         }
  76         mutex_unlock(&rmn->lock);
  77         mutex_unlock(&rdev->mn_lock);
  78         mmu_notifier_unregister(&rmn->mn, rmn->mm);
  79         kfree(rmn);
  80 }
  81
  82 /**
  83  * radeon_mn_release - callback to notify about mm destruction
  84  *
  85  * @mn: our notifier
  86  * @mn: the mm this callback is about
  87  *
  88  * Shedule a work item to lazy destroy our notifier.
  89  */
  90 static void radeon_mn_release(struct mmu_notifier *mn,
  91                               struct mm_struct *mm)
  92 {
  93         struct radeon_mn *rmn = container_of(mn, struct radeon_mn, mn);
  94         INIT_WORK(&rmn->work, radeon_mn_destroy);
  95         schedule_work(&rmn->work);
  96 }
  97
  98 /**
  99  * radeon_mn_invalidate_range_start - callback to notify about mm change
 100  *
 101  * @mn: our notifier
 102  * @mn: the mm this callback is about
 103  * @start: start of updated range
 104  * @end: end of updated range
 105  *
 106  * We block for all BOs between start and end to be idle and
 107  * unmap them by move them into system domain again.
 108  */
 109 static void radeon_mn_invalidate_range_start(struct mmu_notifier *mn,
 110                                              struct mm_struct *mm,
 111                                              unsigned long start,
 112                                              unsigned long end)
 113 {
 114         struct radeon_mn *rmn = container_of(mn, struct radeon_mn, mn);
 115         struct interval_tree_node *it;
 116
 117         /* notification is exclusive, but interval is inclusive */
 118         end -= 1;
 119
 120         mutex_lock(&rmn->lock);
 121
 122         it = interval_tree_iter_first(&rmn->objects, start, end);
 123         while (it) {
 124                 struct radeon_bo *bo;
 125                 struct fence *fence;
 126                 int r;
 127
 128                 bo = container_of(it, struct radeon_bo, mn_it);
 129                 it = interval_tree_iter_next(it, start, end);
 130
 131                 r = radeon_bo_reserve(bo, true);
 132                 if (r) {
 133                         DRM_ERROR("(%d) failed to reserve user bo\n", r);
 134                         continue;
 135                 }
 136
 137                 fence = reservation_object_get_excl(bo->tbo.resv);
 138                 if (fence) {
 139                         r = radeon_fence_wait((struct radeon_fence *)fence, false);
 140                         if (r)
 141                                 DRM_ERROR("(%d) failed to wait for user bo\n", r);
 142                 }
 143
 144                 radeon_ttm_placement_from_domain(bo, RADEON_GEM_DOMAIN_CPU);
 145                 r = ttm_bo_validate(&bo->tbo, &bo->placement, false, false);
 146                 if (r)
 147                         DRM_ERROR("(%d) failed to validate user bo\n", r);
 148
 149                 radeon_bo_unreserve(bo);
 150         }
 151
 152         mutex_unlock(&rmn->lock);
 153 }
 154
 155 static const struct mmu_notifier_ops radeon_mn_ops = {
 156         .release = radeon_mn_release,
 157         .invalidate_range_start = radeon_mn_invalidate_range_start,
 158 };
 159
 160 /**
 161  * radeon_mn_get - create notifier context
 162  *
 163  * @rdev: radeon device pointer
 164  *
 165  * Creates a notifier context for current->mm.
 166  */
 167 static struct radeon_mn *radeon_mn_get(struct radeon_device *rdev)
 168 {
 169         struct mm_struct *mm = current->mm;
 170         struct radeon_mn *rmn;
 171         int r;
 172
 173         down_write(&mm->mmap_sem);
 174         mutex_lock(&rdev->mn_lock);
 175
 176         hash_for_each_possible(rdev->mn_hash, rmn, node, (unsigned long)mm)
 177                 if (rmn->mm == mm)
 178                         goto release_locks;
 179
 180         rmn = kzalloc(sizeof(*rmn), GFP_KERNEL);
 181         if (!rmn) {
 182                 rmn = ERR_PTR(-ENOMEM);
 183                 goto release_locks;
 184         }
 185
 186         rmn->rdev = rdev;
 187         rmn->mm = mm;
 188         rmn->mn.ops = &radeon_mn_ops;
 189         mutex_init(&rmn->lock);
 190         rmn->objects = RB_ROOT;
 191
 192         r = __mmu_notifier_register(&rmn->mn, mm);
 193         if (r)
 194                 goto free_rmn;
 195
 196         hash_add(rdev->mn_hash, &rmn->node, (unsigned long)mm);
 197
 198 release_locks:
 199         mutex_unlock(&rdev->mn_lock);
 200         up_write(&mm->mmap_sem);
 201
 202         return rmn;
 203
 204 free_rmn:
 205         mutex_unlock(&rdev->mn_lock);
 206         up_write(&mm->mmap_sem);
 207         kfree(rmn);
 208
 209         return ERR_PTR(r);
 210 }
 211
 212 /**
 213  * radeon_mn_register - register a BO for notifier updates
 214  *
 215  * @bo: radeon buffer object
 216  * @addr: userptr addr we should monitor
 217  *
 218  * Registers an MMU notifier for the given BO at the specified address.
 219  * Returns 0 on success, -ERRNO if anything goes wrong.
 220  */
 221 int radeon_mn_register(struct radeon_bo *bo, unsigned long addr)
 222 {
 223         unsigned long end = addr + radeon_bo_size(bo) - 1;
 224         struct radeon_device *rdev = bo->rdev;
 225         struct radeon_mn *rmn;
 226         struct interval_tree_node *it;
 227
 228         rmn = radeon_mn_get(rdev);
 229         if (IS_ERR(rmn))
 230                 return PTR_ERR(rmn);
 231
 232         mutex_lock(&rmn->lock);
 233
 234         it = interval_tree_iter_first(&rmn->objects, addr, end);
 235         if (it) {
 236                 mutex_unlock(&rmn->lock);
 237                 return -EEXIST;
 238         }
 239
 240         bo->mn = rmn;
 241         bo->mn_it.start = addr;
 242         bo->mn_it.last = end;
 243         interval_tree_insert(&bo->mn_it, &rmn->objects);
 244
 245         mutex_unlock(&rmn->lock);
 246
 247         return 0;
 248 }
 249
 250 /**
 251  * radeon_mn_unregister - unregister a BO for notifier updates
 252  *
 253  * @bo: radeon buffer object
 254  *
 255  * Remove any registration of MMU notifier updates from the buffer object.
 256  */
 257 void radeon_mn_unregister(struct radeon_bo *bo)
 258 {
 259         struct radeon_device *rdev = bo->rdev;
 260         struct radeon_mn *rmn;
 261
 262         mutex_lock(&rdev->mn_lock);
 263         rmn = bo->mn;
 264         if (rmn == NULL) {
 265                 mutex_unlock(&rdev->mn_lock);
 266                 return;
 267         }
 268
 269         mutex_lock(&rmn->lock);
 270         interval_tree_remove(&bo->mn_it, &rmn->objects);
 271         bo->mn = NULL;
 272         mutex_unlock(&rmn->lock);
 273         mutex_unlock(&rdev->mn_lock);
 274 }