drivers/gpu/drm/radeon/radeon

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
radeon_mn_invalidate_range_start
radeon_mn_release
radeon_mn_alloc_notifier
radeon_mn_free_notifier
radeon_mn_register
radeon_mn_unregister
   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 
  35 #include <drm/drm.h>
  36 
  37 #include "radeon.h"
  38 
  39 struct radeon_mn {
  40         struct mmu_notifier     mn;
  41 
  42         /* objects protected by lock */
  43         struct mutex            lock;
  44         struct rb_root_cached   objects;
  45 };
  46 
  47 struct radeon_mn_node {
  48         struct interval_tree_node       it;
  49         struct list_head                bos;
  50 };
  51 
  52 /**
  53  * radeon_mn_invalidate_range_start - callback to notify about mm change
  54  *
  55  * @mn: our notifier
  56  * @mn: the mm this callback is about
  57  * @start: start of updated range
  58  * @end: end of updated range
  59  *
  60  * We block for all BOs between start and end to be idle and
  61  * unmap them by move them into system domain again.
  62  */
  63 static int radeon_mn_invalidate_range_start(struct mmu_notifier *mn,
  64                                 const struct mmu_notifier_range *range)
  65 {
  66         struct radeon_mn *rmn = container_of(mn, struct radeon_mn, mn);
  67         struct ttm_operation_ctx ctx = { false, false };
  68         struct interval_tree_node *it;
  69         unsigned long end;
  70         int ret = 0;
  71 
  72         /* notification is exclusive, but interval is inclusive */
  73         end = range->end - 1;
  74 
  75         /* TODO we should be able to split locking for interval tree and
  76          * the tear down.
  77          */
  78         if (mmu_notifier_range_blockable(range))
  79                 mutex_lock(&rmn->lock);
  80         else if (!mutex_trylock(&rmn->lock))
  81                 return -EAGAIN;
  82 
  83         it = interval_tree_iter_first(&rmn->objects, range->start, end);
  84         while (it) {
  85                 struct radeon_mn_node *node;
  86                 struct radeon_bo *bo;
  87                 long r;
  88 
  89                 if (!mmu_notifier_range_blockable(range)) {
  90                         ret = -EAGAIN;
  91                         goto out_unlock;
  92                 }
  93 
  94                 node = container_of(it, struct radeon_mn_node, it);
  95                 it = interval_tree_iter_next(it, range->start, end);
  96 
  97                 list_for_each_entry(bo, &node->bos, mn_list) {
  98 
  99                         if (!bo->tbo.ttm || bo->tbo.ttm->state != tt_bound)
 100                                 continue;
 101 
 102                         r = radeon_bo_reserve(bo, true);
 103                         if (r) {
 104                                 DRM_ERROR("(%ld) failed to reserve user bo\n", r);
 105                                 continue;
 106                         }
 107 
 108                         r = dma_resv_wait_timeout_rcu(bo->tbo.base.resv,
 109                                 true, false, MAX_SCHEDULE_TIMEOUT);
 110                         if (r <= 0)
 111                                 DRM_ERROR("(%ld) failed to wait for user bo\n", r);
 112 
 113                         radeon_ttm_placement_from_domain(bo, RADEON_GEM_DOMAIN_CPU);
 114                         r = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
 115                         if (r)
 116                                 DRM_ERROR("(%ld) failed to validate user bo\n", r);
 117 
 118                         radeon_bo_unreserve(bo);
 119                 }
 120         }
 121         
 122 out_unlock:
 123         mutex_unlock(&rmn->lock);
 124 
 125         return ret;
 126 }
 127 
 128 static void radeon_mn_release(struct mmu_notifier *mn, struct mm_struct *mm)
 129 {
 130         struct mmu_notifier_range range = {
 131                 .mm = mm,
 132                 .start = 0,
 133                 .end = ULONG_MAX,
 134                 .flags = 0,
 135                 .event = MMU_NOTIFY_UNMAP,
 136         };
 137 
 138         radeon_mn_invalidate_range_start(mn, &range);
 139 }
 140 
 141 static struct mmu_notifier *radeon_mn_alloc_notifier(struct mm_struct *mm)
 142 {
 143         struct radeon_mn *rmn;
 144 
 145         rmn = kzalloc(sizeof(*rmn), GFP_KERNEL);
 146         if (!rmn)
 147                 return ERR_PTR(-ENOMEM);
 148 
 149         mutex_init(&rmn->lock);
 150         rmn->objects = RB_ROOT_CACHED;
 151         return &rmn->mn;
 152 }
 153 
 154 static void radeon_mn_free_notifier(struct mmu_notifier *mn)
 155 {
 156         kfree(container_of(mn, struct radeon_mn, mn));
 157 }
 158 
 159 static const struct mmu_notifier_ops radeon_mn_ops = {
 160         .release = radeon_mn_release,
 161         .invalidate_range_start = radeon_mn_invalidate_range_start,
 162         .alloc_notifier = radeon_mn_alloc_notifier,
 163         .free_notifier = radeon_mn_free_notifier,
 164 };
 165 
 166 /**
 167  * radeon_mn_register - register a BO for notifier updates
 168  *
 169  * @bo: radeon buffer object
 170  * @addr: userptr addr we should monitor
 171  *
 172  * Registers an MMU notifier for the given BO at the specified address.
 173  * Returns 0 on success, -ERRNO if anything goes wrong.
 174  */
 175 int radeon_mn_register(struct radeon_bo *bo, unsigned long addr)
 176 {
 177         unsigned long end = addr + radeon_bo_size(bo) - 1;
 178         struct mmu_notifier *mn;
 179         struct radeon_mn *rmn;
 180         struct radeon_mn_node *node = NULL;
 181         struct list_head bos;
 182         struct interval_tree_node *it;
 183 
 184         mn = mmu_notifier_get(&radeon_mn_ops, current->mm);
 185         if (IS_ERR(mn))
 186                 return PTR_ERR(mn);
 187         rmn = container_of(mn, struct radeon_mn, mn);
 188 
 189         INIT_LIST_HEAD(&bos);
 190 
 191         mutex_lock(&rmn->lock);
 192 
 193         while ((it = interval_tree_iter_first(&rmn->objects, addr, end))) {
 194                 kfree(node);
 195                 node = container_of(it, struct radeon_mn_node, it);
 196                 interval_tree_remove(&node->it, &rmn->objects);
 197                 addr = min(it->start, addr);
 198                 end = max(it->last, end);
 199                 list_splice(&node->bos, &bos);
 200         }
 201 
 202         if (!node) {
 203                 node = kmalloc(sizeof(struct radeon_mn_node), GFP_KERNEL);
 204                 if (!node) {
 205                         mutex_unlock(&rmn->lock);
 206                         return -ENOMEM;
 207                 }
 208         }
 209 
 210         bo->mn = rmn;
 211 
 212         node->it.start = addr;
 213         node->it.last = end;
 214         INIT_LIST_HEAD(&node->bos);
 215         list_splice(&bos, &node->bos);
 216         list_add(&bo->mn_list, &node->bos);
 217 
 218         interval_tree_insert(&node->it, &rmn->objects);
 219 
 220         mutex_unlock(&rmn->lock);
 221 
 222         return 0;
 223 }
 224 
 225 /**
 226  * radeon_mn_unregister - unregister a BO for notifier updates
 227  *
 228  * @bo: radeon buffer object
 229  *
 230  * Remove any registration of MMU notifier updates from the buffer object.
 231  */
 232 void radeon_mn_unregister(struct radeon_bo *bo)
 233 {
 234         struct radeon_mn *rmn = bo->mn;
 235         struct list_head *head;
 236 
 237         if (!rmn)
 238                 return;
 239 
 240         mutex_lock(&rmn->lock);
 241         /* save the next list entry for later */
 242         head = bo->mn_list.next;
 243 
 244         list_del(&bo->mn_list);
 245 
 246         if (list_empty(head)) {
 247                 struct radeon_mn_node *node;
 248                 node = container_of(head, struct radeon_mn_node, bos);
 249                 interval_tree_remove(&node->it, &rmn->objects);
 250                 kfree(node);
 251         }
 252 
 253         mutex_unlock(&rmn->lock);
 254 
 255         mmu_notifier_put(&rmn->mn);
 256         bo->mn = NULL;
 257 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/gpu/drm/radeon/radeon_mn.c

DEFINITIONS
