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

   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 <drm/drmP.h>
  32 #include "amdgpu.h"
  33 #include "amdgpu_trace.h"
  34
  35 #define AMDGPU_BO_LIST_MAX_PRIORITY     32u
  36 #define AMDGPU_BO_LIST_NUM_BUCKETS      (AMDGPU_BO_LIST_MAX_PRIORITY + 1)
  37
  38 static int amdgpu_bo_list_set(struct amdgpu_device *adev,
  39                                      struct drm_file *filp,
  40                                      struct amdgpu_bo_list *list,
  41                                      struct drm_amdgpu_bo_list_entry *info,
  42                                      unsigned num_entries);
  43
  44 static void amdgpu_bo_list_release_rcu(struct kref *ref)
  45 {
  46         unsigned i;
  47         struct amdgpu_bo_list *list = container_of(ref, struct amdgpu_bo_list,
  48                                                    refcount);
  49
  50         for (i = 0; i < list->num_entries; ++i)
  51                 amdgpu_bo_unref(&list->array[i].robj);
  52
  53         mutex_destroy(&list->lock);
  54         kvfree(list->array);
  55         kfree_rcu(list, rhead);
  56 }
  57
  58 static int amdgpu_bo_list_create(struct amdgpu_device *adev,
  59                                  struct drm_file *filp,
  60                                  struct drm_amdgpu_bo_list_entry *info,
  61                                  unsigned num_entries,
  62                                  int *id)
  63 {
  64         int r;
  65         struct amdgpu_fpriv *fpriv = filp->driver_priv;
  66         struct amdgpu_bo_list *list;
  67
  68         list = kzalloc(sizeof(struct amdgpu_bo_list), GFP_KERNEL);
  69         if (!list)
  70                 return -ENOMEM;
  71
  72         /* initialize bo list*/
  73         mutex_init(&list->lock);
  74         kref_init(&list->refcount);
  75         r = amdgpu_bo_list_set(adev, filp, list, info, num_entries);
  76         if (r) {
  77                 kfree(list);
  78                 return r;
  79         }
  80
  81         /* idr alloc should be called only after initialization of bo list. */
  82         mutex_lock(&fpriv->bo_list_lock);
  83         r = idr_alloc(&fpriv->bo_list_handles, list, 1, 0, GFP_KERNEL);
  84         mutex_unlock(&fpriv->bo_list_lock);
  85         if (r < 0) {
  86                 kfree(list);
  87                 return r;
  88         }
  89         *id = r;
  90
  91         return 0;
  92 }
  93
  94 static void amdgpu_bo_list_destroy(struct amdgpu_fpriv *fpriv, int id)
  95 {
  96         struct amdgpu_bo_list *list;
  97
  98         mutex_lock(&fpriv->bo_list_lock);
  99         list = idr_remove(&fpriv->bo_list_handles, id);
 100         mutex_unlock(&fpriv->bo_list_lock);
 101         if (list)
 102                 kref_put(&list->refcount, amdgpu_bo_list_release_rcu);
 103 }
 104
 105 static int amdgpu_bo_list_set(struct amdgpu_device *adev,
 106                                      struct drm_file *filp,
 107                                      struct amdgpu_bo_list *list,
 108                                      struct drm_amdgpu_bo_list_entry *info,
 109                                      unsigned num_entries)
 110 {
 111         struct amdgpu_bo_list_entry *array;
 112         struct amdgpu_bo *gds_obj = adev->gds.gds_gfx_bo;
 113         struct amdgpu_bo *gws_obj = adev->gds.gws_gfx_bo;
 114         struct amdgpu_bo *oa_obj = adev->gds.oa_gfx_bo;
 115
 116         unsigned last_entry = 0, first_userptr = num_entries;
 117         unsigned i;
 118         int r;
 119         unsigned long total_size = 0;
 120
 121         array = kvmalloc_array(num_entries, sizeof(struct amdgpu_bo_list_entry), GFP_KERNEL);
 122         if (!array)
 123                 return -ENOMEM;
 124         memset(array, 0, num_entries * sizeof(struct amdgpu_bo_list_entry));
 125
 126         for (i = 0; i < num_entries; ++i) {
 127                 struct amdgpu_bo_list_entry *entry;
 128                 struct drm_gem_object *gobj;
 129                 struct amdgpu_bo *bo;
 130                 struct mm_struct *usermm;
 131
 132                 gobj = drm_gem_object_lookup(filp, info[i].bo_handle);
 133                 if (!gobj) {
 134                         r = -ENOENT;
 135                         goto error_free;
 136                 }
 137
 138                 bo = amdgpu_bo_ref(gem_to_amdgpu_bo(gobj));
 139                 drm_gem_object_unreference_unlocked(gobj);
 140
 141                 usermm = amdgpu_ttm_tt_get_usermm(bo->tbo.ttm);
 142                 if (usermm) {
 143                         if (usermm != current->mm) {
 144                                 amdgpu_bo_unref(&bo);
 145                                 r = -EPERM;
 146                                 goto error_free;
 147                         }
 148                         entry = &array[--first_userptr];
 149                 } else {
 150                         entry = &array[last_entry++];
 151                 }
 152
 153                 entry->robj = bo;
 154                 entry->priority = min(info[i].bo_priority,
 155                                       AMDGPU_BO_LIST_MAX_PRIORITY);
 156                 entry->tv.bo = &entry->robj->tbo;
 157                 entry->tv.shared = !entry->robj->prime_shared_count;
 158
 159                 if (entry->robj->prefered_domains == AMDGPU_GEM_DOMAIN_GDS)
 160                         gds_obj = entry->robj;
 161                 if (entry->robj->prefered_domains == AMDGPU_GEM_DOMAIN_GWS)
 162                         gws_obj = entry->robj;
 163                 if (entry->robj->prefered_domains == AMDGPU_GEM_DOMAIN_OA)
 164                         oa_obj = entry->robj;
 165
 166                 total_size += amdgpu_bo_size(entry->robj);
 167                 trace_amdgpu_bo_list_set(list, entry->robj);
 168         }
 169
 170         for (i = 0; i < list->num_entries; ++i)
 171                 amdgpu_bo_unref(&list->array[i].robj);
 172
 173         kvfree(list->array);
 174
 175         list->gds_obj = gds_obj;
 176         list->gws_obj = gws_obj;
 177         list->oa_obj = oa_obj;
 178         list->first_userptr = first_userptr;
 179         list->array = array;
 180         list->num_entries = num_entries;
 181
 182         trace_amdgpu_cs_bo_status(list->num_entries, total_size);
 183         return 0;
 184
 185 error_free:
 186         while (i--)
 187                 amdgpu_bo_unref(&array[i].robj);
 188         kvfree(array);
 189         return r;
 190 }
 191
 192 struct amdgpu_bo_list *
 193 amdgpu_bo_list_get(struct amdgpu_fpriv *fpriv, int id)
 194 {
 195         struct amdgpu_bo_list *result;
 196
 197         rcu_read_lock();
 198         result = idr_find(&fpriv->bo_list_handles, id);
 199
 200         if (result) {
 201                 if (kref_get_unless_zero(&result->refcount)) {
 202                         rcu_read_unlock();
 203                         mutex_lock(&result->lock);
 204                 } else {
 205                         rcu_read_unlock();
 206                         result = NULL;
 207                 }
 208         } else {
 209                 rcu_read_unlock();
 210         }
 211
 212         return result;
 213 }
 214
 215 void amdgpu_bo_list_get_list(struct amdgpu_bo_list *list,
 216                              struct list_head *validated)
 217 {
 218         /* This is based on the bucket sort with O(n) time complexity.
 219          * An item with priority "i" is added to bucket[i]. The lists are then
 220          * concatenated in descending order.
 221          */
 222         struct list_head bucket[AMDGPU_BO_LIST_NUM_BUCKETS];
 223         unsigned i;
 224
 225         for (i = 0; i < AMDGPU_BO_LIST_NUM_BUCKETS; i++)
 226                 INIT_LIST_HEAD(&bucket[i]);
 227
 228         /* Since buffers which appear sooner in the relocation list are
 229          * likely to be used more often than buffers which appear later
 230          * in the list, the sort mustn't change the ordering of buffers
 231          * with the same priority, i.e. it must be stable.
 232          */
 233         for (i = 0; i < list->num_entries; i++) {
 234                 unsigned priority = list->array[i].priority;
 235
 236                 list_add_tail(&list->array[i].tv.head,
 237                               &bucket[priority]);
 238                 list->array[i].user_pages = NULL;
 239         }
 240
 241         /* Connect the sorted buckets in the output list. */
 242         for (i = 0; i < AMDGPU_BO_LIST_NUM_BUCKETS; i++)
 243                 list_splice(&bucket[i], validated);
 244 }
 245
 246 void amdgpu_bo_list_put(struct amdgpu_bo_list *list)
 247 {
 248         mutex_unlock(&list->lock);
 249         kref_put(&list->refcount, amdgpu_bo_list_release_rcu);
 250 }
 251
 252 void amdgpu_bo_list_free(struct amdgpu_bo_list *list)
 253 {
 254         unsigned i;
 255
 256         for (i = 0; i < list->num_entries; ++i)
 257                 amdgpu_bo_unref(&list->array[i].robj);
 258
 259         mutex_destroy(&list->lock);
 260         kvfree(list->array);
 261         kfree(list);
 262 }
 263
 264 int amdgpu_bo_list_ioctl(struct drm_device *dev, void *data,
 265                                 struct drm_file *filp)
 266 {
 267         const uint32_t info_size = sizeof(struct drm_amdgpu_bo_list_entry);
 268
 269         struct amdgpu_device *adev = dev->dev_private;
 270         struct amdgpu_fpriv *fpriv = filp->driver_priv;
 271         union drm_amdgpu_bo_list *args = data;
 272         uint32_t handle = args->in.list_handle;
 273         const void __user *uptr = (const void*)(uintptr_t)args->in.bo_info_ptr;
 274
 275         struct drm_amdgpu_bo_list_entry *info;
 276         struct amdgpu_bo_list *list;
 277
 278         int r;
 279
 280         info = kvmalloc_array(args->in.bo_number,
 281                              sizeof(struct drm_amdgpu_bo_list_entry), GFP_KERNEL);
 282         if (!info)
 283                 return -ENOMEM;
 284
 285         /* copy the handle array from userspace to a kernel buffer */
 286         r = -EFAULT;
 287         if (likely(info_size == args->in.bo_info_size)) {
 288                 unsigned long bytes = args->in.bo_number *
 289                         args->in.bo_info_size;
 290
 291                 if (copy_from_user(info, uptr, bytes))
 292                         goto error_free;
 293
 294         } else {
 295                 unsigned long bytes = min(args->in.bo_info_size, info_size);
 296                 unsigned i;
 297
 298                 memset(info, 0, args->in.bo_number * info_size);
 299                 for (i = 0; i < args->in.bo_number; ++i) {
 300                         if (copy_from_user(&info[i], uptr, bytes))
 301                                 goto error_free;
 302
 303                         uptr += args->in.bo_info_size;
 304                 }
 305         }
 306
 307         switch (args->in.operation) {
 308         case AMDGPU_BO_LIST_OP_CREATE:
 309                 r = amdgpu_bo_list_create(adev, filp, info, args->in.bo_number,
 310                                           &handle);
 311                 if (r)
 312                         goto error_free;
 313                 break;
 314
 315         case AMDGPU_BO_LIST_OP_DESTROY:
 316                 amdgpu_bo_list_destroy(fpriv, handle);
 317                 handle = 0;
 318                 break;
 319
 320         case AMDGPU_BO_LIST_OP_UPDATE:
 321                 r = -ENOENT;
 322                 list = amdgpu_bo_list_get(fpriv, handle);
 323                 if (!list)
 324                         goto error_free;
 325
 326                 r = amdgpu_bo_list_set(adev, filp, list, info,
 327                                               args->in.bo_number);
 328                 amdgpu_bo_list_put(list);
 329                 if (r)
 330                         goto error_free;
 331
 332                 break;
 333
 334         default:
 335                 r = -EINVAL;
 336                 goto error_free;
 337         }
 338
 339         memset(args, 0, sizeof(*args));
 340         args->out.list_handle = handle;
 341         kvfree(info);
 342
 343         return 0;
 344
 345 error_free:
 346         kvfree(info);
 347         return r;
 348 }