root/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c

DEFINITIONS

1. amdgpu_bo_list_free_rcu
2. amdgpu_bo_list_free
3. amdgpu_bo_list_create
4. amdgpu_bo_list_destroy
5. amdgpu_bo_list_get
6. amdgpu_bo_list_get_list
7. amdgpu_bo_list_put
8. amdgpu_bo_create_list_entry_array
9. amdgpu_bo_list_ioctl

   1 /*
   2  * Copyright 2015 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 <deathsimple@vodafone.de>
  29  */
  30 
  31 #include <linux/uaccess.h>
  32 
  33 #include "amdgpu.h"
  34 #include "amdgpu_trace.h"
  35 
  36 #define AMDGPU_BO_LIST_MAX_PRIORITY     32u
  37 #define AMDGPU_BO_LIST_NUM_BUCKETS      (AMDGPU_BO_LIST_MAX_PRIORITY + 1)
  38 
  39 static void amdgpu_bo_list_free_rcu(struct rcu_head *rcu)
  40 {
  41         struct amdgpu_bo_list *list = container_of(rcu, struct amdgpu_bo_list,
  42                                                    rhead);
  43 
  44         kvfree(list);
  45 }
  46 
  47 static void amdgpu_bo_list_free(struct kref *ref)
  48 {
  49         struct amdgpu_bo_list *list = container_of(ref, struct amdgpu_bo_list,
  50                                                    refcount);
  51         struct amdgpu_bo_list_entry *e;
  52 
  53         amdgpu_bo_list_for_each_entry(e, list) {
  54                 struct amdgpu_bo *bo = ttm_to_amdgpu_bo(e->tv.bo);
  55 
  56                 amdgpu_bo_unref(&bo);
  57         }
  58 
  59         call_rcu(&list->rhead, amdgpu_bo_list_free_rcu);
  60 }
  61 
  62 int amdgpu_bo_list_create(struct amdgpu_device *adev, struct drm_file *filp,
  63                           struct drm_amdgpu_bo_list_entry *info,
  64                           unsigned num_entries, struct amdgpu_bo_list **result)
  65 {
  66         unsigned last_entry = 0, first_userptr = num_entries;
  67         struct amdgpu_bo_list_entry *array;
  68         struct amdgpu_bo_list *list;
  69         uint64_t total_size = 0;
  70         size_t size;
  71         unsigned i;
  72         int r;
  73 
  74         if (num_entries > (SIZE_MAX - sizeof(struct amdgpu_bo_list))
  75                                 / sizeof(struct amdgpu_bo_list_entry))
  76                 return -EINVAL;
  77 
  78         size = sizeof(struct amdgpu_bo_list);
  79         size += num_entries * sizeof(struct amdgpu_bo_list_entry);
  80         list = kvmalloc(size, GFP_KERNEL);
  81         if (!list)
  82                 return -ENOMEM;
  83 
  84         kref_init(&list->refcount);
  85         list->gds_obj = NULL;
  86         list->gws_obj = NULL;
  87         list->oa_obj = NULL;
  88 
  89         array = amdgpu_bo_list_array_entry(list, 0);
  90         memset(array, 0, num_entries * sizeof(struct amdgpu_bo_list_entry));
  91 
  92         for (i = 0; i < num_entries; ++i) {
  93                 struct amdgpu_bo_list_entry *entry;
  94                 struct drm_gem_object *gobj;
  95                 struct amdgpu_bo *bo;
  96                 struct mm_struct *usermm;
  97 
  98                 gobj = drm_gem_object_lookup(filp, info[i].bo_handle);
  99                 if (!gobj) {
 100                         r = -ENOENT;
 101                         goto error_free;
 102                 }
 103 
 104                 bo = amdgpu_bo_ref(gem_to_amdgpu_bo(gobj));
 105                 drm_gem_object_put_unlocked(gobj);
 106 
 107                 usermm = amdgpu_ttm_tt_get_usermm(bo->tbo.ttm);
 108                 if (usermm) {
 109                         if (usermm != current->mm) {
 110                                 amdgpu_bo_unref(&bo);
 111                                 r = -EPERM;
 112                                 goto error_free;
 113                         }
 114                         entry = &array[--first_userptr];
 115                 } else {
 116                         entry = &array[last_entry++];
 117                 }
 118 
 119                 entry->priority = min(info[i].bo_priority,
 120                                       AMDGPU_BO_LIST_MAX_PRIORITY);
 121                 entry->tv.bo = &bo->tbo;
 122 
 123                 if (bo->preferred_domains == AMDGPU_GEM_DOMAIN_GDS)
 124                         list->gds_obj = bo;
 125                 if (bo->preferred_domains == AMDGPU_GEM_DOMAIN_GWS)
 126                         list->gws_obj = bo;
 127                 if (bo->preferred_domains == AMDGPU_GEM_DOMAIN_OA)
 128                         list->oa_obj = bo;
 129 
 130                 total_size += amdgpu_bo_size(bo);
 131                 trace_amdgpu_bo_list_set(list, bo);
 132         }
 133 
 134         list->first_userptr = first_userptr;
 135         list->num_entries = num_entries;
 136 
 137         trace_amdgpu_cs_bo_status(list->num_entries, total_size);
 138 
 139         *result = list;
 140         return 0;
 141 
 142 error_free:
 143         for (i = 0; i < last_entry; ++i) {
 144                 struct amdgpu_bo *bo = ttm_to_amdgpu_bo(array[i].tv.bo);
 145 
 146                 amdgpu_bo_unref(&bo);
 147         }
 148         for (i = first_userptr; i < num_entries; ++i) {
 149                 struct amdgpu_bo *bo = ttm_to_amdgpu_bo(array[i].tv.bo);
 150 
 151                 amdgpu_bo_unref(&bo);
 152         }
 153         kvfree(list);
 154         return r;
 155 
 156 }
 157 
 158 static void amdgpu_bo_list_destroy(struct amdgpu_fpriv *fpriv, int id)
 159 {
 160         struct amdgpu_bo_list *list;
 161 
 162         mutex_lock(&fpriv->bo_list_lock);
 163         list = idr_remove(&fpriv->bo_list_handles, id);
 164         mutex_unlock(&fpriv->bo_list_lock);
 165         if (list)
 166                 kref_put(&list->refcount, amdgpu_bo_list_free);
 167 }
 168 
 169 int amdgpu_bo_list_get(struct amdgpu_fpriv *fpriv, int id,
 170                        struct amdgpu_bo_list **result)
 171 {
 172         rcu_read_lock();
 173         *result = idr_find(&fpriv->bo_list_handles, id);
 174 
 175         if (*result && kref_get_unless_zero(&(*result)->refcount)) {
 176                 rcu_read_unlock();
 177                 return 0;
 178         }
 179 
 180         rcu_read_unlock();
 181         return -ENOENT;
 182 }
 183 
 184 void amdgpu_bo_list_get_list(struct amdgpu_bo_list *list,
 185                              struct list_head *validated)
 186 {
 187         /* This is based on the bucket sort with O(n) time complexity.
 188          * An item with priority "i" is added to bucket[i]. The lists are then
 189          * concatenated in descending order.
 190          */
 191         struct list_head bucket[AMDGPU_BO_LIST_NUM_BUCKETS];
 192         struct amdgpu_bo_list_entry *e;
 193         unsigned i;
 194 
 195         for (i = 0; i < AMDGPU_BO_LIST_NUM_BUCKETS; i++)
 196                 INIT_LIST_HEAD(&bucket[i]);
 197 
 198         /* Since buffers which appear sooner in the relocation list are
 199          * likely to be used more often than buffers which appear later
 200          * in the list, the sort mustn't change the ordering of buffers
 201          * with the same priority, i.e. it must be stable.
 202          */
 203         amdgpu_bo_list_for_each_entry(e, list) {
 204                 struct amdgpu_bo *bo = ttm_to_amdgpu_bo(e->tv.bo);
 205                 unsigned priority = e->priority;
 206 
 207                 if (!bo->parent)
 208                         list_add_tail(&e->tv.head, &bucket[priority]);
 209 
 210                 e->user_pages = NULL;
 211         }
 212 
 213         /* Connect the sorted buckets in the output list. */
 214         for (i = 0; i < AMDGPU_BO_LIST_NUM_BUCKETS; i++)
 215                 list_splice(&bucket[i], validated);
 216 }
 217 
 218 void amdgpu_bo_list_put(struct amdgpu_bo_list *list)
 219 {
 220         kref_put(&list->refcount, amdgpu_bo_list_free);
 221 }
 222 
 223 int amdgpu_bo_create_list_entry_array(struct drm_amdgpu_bo_list_in *in,
 224                                       struct drm_amdgpu_bo_list_entry **info_param)
 225 {
 226         const void __user *uptr = u64_to_user_ptr(in->bo_info_ptr);
 227         const uint32_t info_size = sizeof(struct drm_amdgpu_bo_list_entry);
 228         struct drm_amdgpu_bo_list_entry *info;
 229         int r;
 230 
 231         info = kvmalloc_array(in->bo_number, info_size, GFP_KERNEL);
 232         if (!info)
 233                 return -ENOMEM;
 234 
 235         /* copy the handle array from userspace to a kernel buffer */
 236         r = -EFAULT;
 237         if (likely(info_size == in->bo_info_size)) {
 238                 unsigned long bytes = in->bo_number *
 239                         in->bo_info_size;
 240 
 241                 if (copy_from_user(info, uptr, bytes))
 242                         goto error_free;
 243 
 244         } else {
 245                 unsigned long bytes = min(in->bo_info_size, info_size);
 246                 unsigned i;
 247 
 248                 memset(info, 0, in->bo_number * info_size);
 249                 for (i = 0; i < in->bo_number; ++i) {
 250                         if (copy_from_user(&info[i], uptr, bytes))
 251                                 goto error_free;
 252 
 253                         uptr += in->bo_info_size;
 254                 }
 255         }
 256 
 257         *info_param = info;
 258         return 0;
 259 
 260 error_free:
 261         kvfree(info);
 262         return r;
 263 }
 264 
 265 int amdgpu_bo_list_ioctl(struct drm_device *dev, void *data,
 266                                 struct drm_file *filp)
 267 {
 268         struct amdgpu_device *adev = dev->dev_private;
 269         struct amdgpu_fpriv *fpriv = filp->driver_priv;
 270         union drm_amdgpu_bo_list *args = data;
 271         uint32_t handle = args->in.list_handle;
 272         struct drm_amdgpu_bo_list_entry *info = NULL;
 273         struct amdgpu_bo_list *list, *old;
 274         int r;
 275 
 276         r = amdgpu_bo_create_list_entry_array(&args->in, &info);
 277         if (r)
 278                 return r;
 279 
 280         switch (args->in.operation) {
 281         case AMDGPU_BO_LIST_OP_CREATE:
 282                 r = amdgpu_bo_list_create(adev, filp, info, args->in.bo_number,
 283                                           &list);
 284                 if (r)
 285                         goto error_free;
 286 
 287                 mutex_lock(&fpriv->bo_list_lock);
 288                 r = idr_alloc(&fpriv->bo_list_handles, list, 1, 0, GFP_KERNEL);
 289                 mutex_unlock(&fpriv->bo_list_lock);
 290                 if (r < 0) {
 291                         goto error_put_list;
 292                 }
 293 
 294                 handle = r;
 295                 break;
 296 
 297         case AMDGPU_BO_LIST_OP_DESTROY:
 298                 amdgpu_bo_list_destroy(fpriv, handle);
 299                 handle = 0;
 300                 break;
 301 
 302         case AMDGPU_BO_LIST_OP_UPDATE:
 303                 r = amdgpu_bo_list_create(adev, filp, info, args->in.bo_number,
 304                                           &list);
 305                 if (r)
 306                         goto error_free;
 307 
 308                 mutex_lock(&fpriv->bo_list_lock);
 309                 old = idr_replace(&fpriv->bo_list_handles, list, handle);
 310                 mutex_unlock(&fpriv->bo_list_lock);
 311 
 312                 if (IS_ERR(old)) {
 313                         r = PTR_ERR(old);
 314                         goto error_put_list;
 315                 }
 316 
 317                 amdgpu_bo_list_put(old);
 318                 break;
 319 
 320         default:
 321                 r = -EINVAL;
 322                 goto error_free;
 323         }
 324 
 325         memset(args, 0, sizeof(*args));
 326         args->out.list_handle = handle;
 327         kvfree(info);
 328 
 329         return 0;
 330 
 331 error_put_list:
 332         amdgpu_bo_list_put(list);
 333 
 334 error_free:
 335         kvfree(info);
 336         return r;
 337 }