The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/dev/drm/i915_mem.c

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    1 /* i915_mem.c -- Simple agp/fb memory manager for i915 -*- linux-c -*-
    2  */
    3 /*-
    4  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
    5  * All Rights Reserved.
    6  *
    7  * Permission is hereby granted, free of charge, to any person obtaining a
    8  * copy of this software and associated documentation files (the
    9  * "Software"), to deal in the Software without restriction, including
   10  * without limitation the rights to use, copy, modify, merge, publish,
   11  * distribute, sub license, and/or sell copies of the Software, and to
   12  * permit persons to whom the Software is furnished to do so, subject to
   13  * the following conditions:
   14  *
   15  * The above copyright notice and this permission notice (including the
   16  * next paragraph) shall be included in all copies or substantial portions
   17  * of the Software.
   18  *
   19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
   22  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
   23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
   24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
   25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   26  *
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include "dev/drm/drmP.h"
   33 #include "dev/drm/drm.h"
   34 #include "dev/drm/i915_drm.h"
   35 #include "dev/drm/i915_drv.h"
   36 
   37 /* This memory manager is integrated into the global/local lru
   38  * mechanisms used by the clients.  Specifically, it operates by
   39  * setting the 'in_use' fields of the global LRU to indicate whether
   40  * this region is privately allocated to a client.
   41  *
   42  * This does require the client to actually respect that field.
   43  *
   44  * Currently no effort is made to allocate 'private' memory in any
   45  * clever way - the LRU information isn't used to determine which
   46  * block to allocate, and the ring is drained prior to allocations --
   47  * in other words allocation is expensive.
   48  */
   49 static void mark_block(struct drm_device * dev, struct mem_block *p, int in_use)
   50 {
   51         drm_i915_private_t *dev_priv = dev->dev_private;
   52         drm_i915_sarea_t *sarea_priv = dev_priv->sarea_priv;
   53         struct drm_tex_region *list;
   54         unsigned shift, nr;
   55         unsigned start;
   56         unsigned end;
   57         unsigned i;
   58         int age;
   59 
   60         shift = dev_priv->tex_lru_log_granularity;
   61         nr = I915_NR_TEX_REGIONS;
   62 
   63         start = p->start >> shift;
   64         end = (p->start + p->size - 1) >> shift;
   65 
   66         age = ++sarea_priv->texAge;
   67         list = sarea_priv->texList;
   68 
   69         /* Mark the regions with the new flag and update their age.  Move
   70          * them to head of list to preserve LRU semantics.
   71          */
   72         for (i = start; i <= end; i++) {
   73                 list[i].in_use = in_use;
   74                 list[i].age = age;
   75 
   76                 /* remove_from_list(i)
   77                  */
   78                 list[(unsigned)list[i].next].prev = list[i].prev;
   79                 list[(unsigned)list[i].prev].next = list[i].next;
   80 
   81                 /* insert_at_head(list, i)
   82                  */
   83                 list[i].prev = nr;
   84                 list[i].next = list[nr].next;
   85                 list[(unsigned)list[nr].next].prev = i;
   86                 list[nr].next = i;
   87         }
   88 }
   89 
   90 /* Very simple allocator for agp memory, working on a static range
   91  * already mapped into each client's address space.
   92  */
   93 
   94 static struct mem_block *split_block(struct mem_block *p, int start, int size,
   95                                      struct drm_file *file_priv)
   96 {
   97         /* Maybe cut off the start of an existing block */
   98         if (start > p->start) {
   99                 struct mem_block *newblock =
  100                     drm_alloc(sizeof(*newblock), DRM_MEM_BUFLISTS);
  101                 if (!newblock)
  102                         goto out;
  103                 newblock->start = start;
  104                 newblock->size = p->size - (start - p->start);
  105                 newblock->file_priv = NULL;
  106                 newblock->next = p->next;
  107                 newblock->prev = p;
  108                 p->next->prev = newblock;
  109                 p->next = newblock;
  110                 p->size -= newblock->size;
  111                 p = newblock;
  112         }
  113 
  114         /* Maybe cut off the end of an existing block */
  115         if (size < p->size) {
  116                 struct mem_block *newblock =
  117                     drm_alloc(sizeof(*newblock), DRM_MEM_BUFLISTS);
  118                 if (!newblock)
  119                         goto out;
  120                 newblock->start = start + size;
  121                 newblock->size = p->size - size;
  122                 newblock->file_priv = NULL;
  123                 newblock->next = p->next;
  124                 newblock->prev = p;
  125                 p->next->prev = newblock;
  126                 p->next = newblock;
  127                 p->size = size;
  128         }
  129 
  130       out:
  131         /* Our block is in the middle */
  132         p->file_priv = file_priv;
  133         return p;
  134 }
  135 
  136 static struct mem_block *alloc_block(struct mem_block *heap, int size,
  137                                      int align2, struct drm_file *file_priv)
  138 {
  139         struct mem_block *p;
  140         int mask = (1 << align2) - 1;
  141 
  142         for (p = heap->next; p != heap; p = p->next) {
  143                 int start = (p->start + mask) & ~mask;
  144                 if (p->file_priv == NULL && start + size <= p->start + p->size)
  145                         return split_block(p, start, size, file_priv);
  146         }
  147 
  148         return NULL;
  149 }
  150 
  151 static struct mem_block *find_block(struct mem_block *heap, int start)
  152 {
  153         struct mem_block *p;
  154 
  155         for (p = heap->next; p != heap; p = p->next)
  156                 if (p->start == start)
  157                         return p;
  158 
  159         return NULL;
  160 }
  161 
  162 static void free_block(struct mem_block *p)
  163 {
  164         p->file_priv = NULL;
  165 
  166         /* Assumes a single contiguous range.  Needs a special file_priv in
  167          * 'heap' to stop it being subsumed.
  168          */
  169         if (p->next->file_priv == NULL) {
  170                 struct mem_block *q = p->next;
  171                 p->size += q->size;
  172                 p->next = q->next;
  173                 p->next->prev = p;
  174                 drm_free(q, sizeof(*q), DRM_MEM_BUFLISTS);
  175         }
  176 
  177         if (p->prev->file_priv == NULL) {
  178                 struct mem_block *q = p->prev;
  179                 q->size += p->size;
  180                 q->next = p->next;
  181                 q->next->prev = q;
  182                 drm_free(p, sizeof(*q), DRM_MEM_BUFLISTS);
  183         }
  184 }
  185 
  186 /* Initialize.  How to check for an uninitialized heap?
  187  */
  188 static int init_heap(struct mem_block **heap, int start, int size)
  189 {
  190         struct mem_block *blocks = drm_alloc(sizeof(*blocks), DRM_MEM_BUFLISTS);
  191 
  192         if (!blocks)
  193                 return -ENOMEM;
  194 
  195         *heap = drm_alloc(sizeof(**heap), DRM_MEM_BUFLISTS);
  196         if (!*heap) {
  197                 drm_free(blocks, sizeof(*blocks), DRM_MEM_BUFLISTS);
  198                 return -ENOMEM;
  199         }
  200 
  201         blocks->start = start;
  202         blocks->size = size;
  203         blocks->file_priv = NULL;
  204         blocks->next = blocks->prev = *heap;
  205 
  206         memset(*heap, 0, sizeof(**heap));
  207         (*heap)->file_priv = (struct drm_file *) - 1;
  208         (*heap)->next = (*heap)->prev = blocks;
  209         return 0;
  210 }
  211 
  212 /* Free all blocks associated with the releasing file.
  213  */
  214 void i915_mem_release(struct drm_device * dev, struct drm_file *file_priv,
  215                       struct mem_block *heap)
  216 {
  217         struct mem_block *p;
  218 
  219         if (!heap || !heap->next)
  220                 return;
  221 
  222         for (p = heap->next; p != heap; p = p->next) {
  223                 if (p->file_priv == file_priv) {
  224                         p->file_priv = NULL;
  225                         mark_block(dev, p, 0);
  226                 }
  227         }
  228 
  229         /* Assumes a single contiguous range.  Needs a special file_priv in
  230          * 'heap' to stop it being subsumed.
  231          */
  232         for (p = heap->next; p != heap; p = p->next) {
  233                 while (p->file_priv == NULL && p->next->file_priv == NULL) {
  234                         struct mem_block *q = p->next;
  235                         p->size += q->size;
  236                         p->next = q->next;
  237                         p->next->prev = p;
  238                         drm_free(q, sizeof(*q), DRM_MEM_BUFLISTS);
  239                 }
  240         }
  241 }
  242 
  243 /* Shutdown.
  244  */
  245 void i915_mem_takedown(struct mem_block **heap)
  246 {
  247         struct mem_block *p;
  248 
  249         if (!*heap)
  250                 return;
  251 
  252         for (p = (*heap)->next; p != *heap;) {
  253                 struct mem_block *q = p;
  254                 p = p->next;
  255                 drm_free(q, sizeof(*q), DRM_MEM_BUFLISTS);
  256         }
  257 
  258         drm_free(*heap, sizeof(**heap), DRM_MEM_BUFLISTS);
  259         *heap = NULL;
  260 }
  261 
  262 static struct mem_block **get_heap(drm_i915_private_t * dev_priv, int region)
  263 {
  264         switch (region) {
  265         case I915_MEM_REGION_AGP:
  266                 return &dev_priv->agp_heap;
  267         default:
  268                 return NULL;
  269         }
  270 }
  271 
  272 /* IOCTL HANDLERS */
  273 
  274 int i915_mem_alloc(struct drm_device *dev, void *data,
  275                    struct drm_file *file_priv)
  276 {
  277         drm_i915_private_t *dev_priv = dev->dev_private;
  278         drm_i915_mem_alloc_t *alloc = data;
  279         struct mem_block *block, **heap;
  280 
  281         if (!dev_priv) {
  282                 DRM_ERROR("called with no initialization\n");
  283                 return -EINVAL;
  284         }
  285 
  286         heap = get_heap(dev_priv, alloc->region);
  287         if (!heap || !*heap)
  288                 return -EFAULT;
  289 
  290         /* Make things easier on ourselves: all allocations at least
  291          * 4k aligned.
  292          */
  293         if (alloc->alignment < 12)
  294                 alloc->alignment = 12;
  295 
  296         block = alloc_block(*heap, alloc->size, alloc->alignment, file_priv);
  297 
  298         if (!block)
  299                 return -ENOMEM;
  300 
  301         mark_block(dev, block, 1);
  302 
  303         if (DRM_COPY_TO_USER(alloc->region_offset, &block->start,
  304                              sizeof(int))) {
  305                 DRM_ERROR("copy_to_user\n");
  306                 return -EFAULT;
  307         }
  308 
  309         return 0;
  310 }
  311 
  312 int i915_mem_free(struct drm_device *dev, void *data,
  313                   struct drm_file *file_priv)
  314 {
  315         drm_i915_private_t *dev_priv = dev->dev_private;
  316         drm_i915_mem_free_t *memfree = data;
  317         struct mem_block *block, **heap;
  318 
  319         if (!dev_priv) {
  320                 DRM_ERROR("called with no initialization\n");
  321                 return -EINVAL;
  322         }
  323 
  324         heap = get_heap(dev_priv, memfree->region);
  325         if (!heap || !*heap)
  326                 return -EFAULT;
  327 
  328         block = find_block(*heap, memfree->region_offset);
  329         if (!block)
  330                 return -EFAULT;
  331 
  332         if (block->file_priv != file_priv)
  333                 return -EPERM;
  334 
  335         mark_block(dev, block, 0);
  336         free_block(block);
  337         return 0;
  338 }
  339 
  340 int i915_mem_init_heap(struct drm_device *dev, void *data,
  341                        struct drm_file *file_priv)
  342 {
  343         drm_i915_private_t *dev_priv = dev->dev_private;
  344         drm_i915_mem_init_heap_t *initheap = data;
  345         struct mem_block **heap;
  346 
  347         if (!dev_priv) {
  348                 DRM_ERROR("called with no initialization\n");
  349                 return -EINVAL;
  350         }
  351 
  352         heap = get_heap(dev_priv, initheap->region);
  353         if (!heap)
  354                 return -EFAULT;
  355 
  356         if (*heap) {
  357                 DRM_ERROR("heap already initialized?");
  358                 return -EFAULT;
  359         }
  360 
  361         return init_heap(heap, initheap->start, initheap->size);
  362 }
  363 
  364 int i915_mem_destroy_heap( struct drm_device *dev, void *data,
  365                            struct drm_file *file_priv )
  366 {
  367         drm_i915_private_t *dev_priv = dev->dev_private;
  368         drm_i915_mem_destroy_heap_t *destroyheap = data;
  369         struct mem_block **heap;
  370 
  371         if ( !dev_priv ) {
  372                 DRM_ERROR( "called with no initialization\n" );
  373                 return -EINVAL;
  374         }
  375 
  376         heap = get_heap( dev_priv, destroyheap->region );
  377         if (!heap) {
  378                 DRM_ERROR("get_heap failed");
  379                 return -EFAULT;
  380         }
  381 
  382         if (!*heap) {
  383                 DRM_ERROR("heap not initialized?");
  384                 return -EFAULT;
  385         }
  386 
  387         i915_mem_takedown( heap );
  388         return 0;
  389 }

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