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                 int r;
 126
 127                 bo = container_of(it, struct radeon_bo, mn_it);
 128                 it = interval_tree_iter_next(it, start, end);
 129
 130                 r = radeon_bo_reserve(bo, true);
 131                 if (r) {
 132                         DRM_ERROR("(%d) failed to reserve user bo\n", r);
 133                         continue;
 134                 }
 135
 136                 r = reservation_object_wait_timeout_rcu(bo->tbo.resv, true,
 137                         false, MAX_SCHEDULE_TIMEOUT);
 138                 if (r)
 139                         DRM_ERROR("(%d) failed to wait for user bo\n", r);
 140
 141                 radeon_ttm_placement_from_domain(bo, RADEON_GEM_DOMAIN_CPU);
 142                 r = ttm_bo_validate(&bo->tbo, &bo->placement, false, false);
 143                 if (r)
 144                         DRM_ERROR("(%d) failed to validate user bo\n", r);
 145
 146                 radeon_bo_unreserve(bo);
 147         }
 148
 149         mutex_unlock(&rmn->lock);
 150 }
 151
 152 static const struct mmu_notifier_ops radeon_mn_ops = {
 153         .release = radeon_mn_release,
 154         .invalidate_range_start = radeon_mn_invalidate_range_start,
 155 };
 156
 157 /**
 158  * radeon_mn_get - create notifier context
 159  *
 160  * @rdev: radeon device pointer
 161  *
 162  * Creates a notifier context for current->mm.
 163  */
 164 static struct radeon_mn *radeon_mn_get(struct radeon_device *rdev)
 165 {
 166         struct mm_struct *mm = current->mm;
 167         struct radeon_mn *rmn;
 168         int r;
 169
 170         down_write(&mm->mmap_sem);
 171         mutex_lock(&rdev->mn_lock);
 172
 173         hash_for_each_possible(rdev->mn_hash, rmn, node, (unsigned long)mm)
 174                 if (rmn->mm == mm)
 175                         goto release_locks;
 176
 177         rmn = kzalloc(sizeof(*rmn), GFP_KERNEL);
 178         if (!rmn) {
 179                 rmn = ERR_PTR(-ENOMEM);
 180                 goto release_locks;
 181         }
 182
 183         rmn->rdev = rdev;
 184         rmn->mm = mm;
 185         rmn->mn.ops = &radeon_mn_ops;
 186         mutex_init(&rmn->lock);
 187         rmn->objects = RB_ROOT;
 188
 189         r = __mmu_notifier_register(&rmn->mn, mm);
 190         if (r)
 191                 goto free_rmn;
 192
 193         hash_add(rdev->mn_hash, &rmn->node, (unsigned long)mm);
 194
 195 release_locks:
 196         mutex_unlock(&rdev->mn_lock);
 197         up_write(&mm->mmap_sem);
 198
 199         return rmn;
 200
 201 free_rmn:
 202         mutex_unlock(&rdev->mn_lock);
 203         up_write(&mm->mmap_sem);
 204         kfree(rmn);
 205
 206         return ERR_PTR(r);
 207 }
 208
 209 /**
 210  * radeon_mn_register - register a BO for notifier updates
 211  *
 212  * @bo: radeon buffer object
 213  * @addr: userptr addr we should monitor
 214  *
 215  * Registers an MMU notifier for the given BO at the specified address.
 216  * Returns 0 on success, -ERRNO if anything goes wrong.
 217  */
 218 int radeon_mn_register(struct radeon_bo *bo, unsigned long addr)
 219 {
 220         unsigned long end = addr + radeon_bo_size(bo) - 1;
 221         struct radeon_device *rdev = bo->rdev;
 222         struct radeon_mn *rmn;
 223         struct interval_tree_node *it;
 224
 225         rmn = radeon_mn_get(rdev);
 226         if (IS_ERR(rmn))
 227                 return PTR_ERR(rmn);
 228
 229         mutex_lock(&rmn->lock);
 230
 231         it = interval_tree_iter_first(&rmn->objects, addr, end);
 232         if (it) {
 233                 mutex_unlock(&rmn->lock);
 234                 return -EEXIST;
 235         }
 236
 237         bo->mn = rmn;
 238         bo->mn_it.start = addr;
 239         bo->mn_it.last = end;
 240         interval_tree_insert(&bo->mn_it, &rmn->objects);
 241
 242         mutex_unlock(&rmn->lock);
 243
 244         return 0;
 245 }
 246
 247 /**
 248  * radeon_mn_unregister - unregister a BO for notifier updates
 249  *
 250  * @bo: radeon buffer object
 251  *
 252  * Remove any registration of MMU notifier updates from the buffer object.
 253  */
 254 void radeon_mn_unregister(struct radeon_bo *bo)
 255 {
 256         struct radeon_device *rdev = bo->rdev;
 257         struct radeon_mn *rmn;
 258
 259         mutex_lock(&rdev->mn_lock);
 260         rmn = bo->mn;
 261         if (rmn == NULL) {
 262                 mutex_unlock(&rdev->mn_lock);
 263                 return;
 264         }
 265
 266         mutex_lock(&rmn->lock);
 267         interval_tree_remove(&bo->mn_it, &rmn->objects);
 268         bo->mn = NULL;
 269         mutex_unlock(&rmn->lock);
 270         mutex_unlock(&rdev->mn_lock);
 271 }