kernel/drivers/gpu/drm/nouveau/nvkm/core/mm.c

   1 /*
   2  * Copyright 2012 Red Hat Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * Authors: Ben Skeggs
  23  */
  24 #include <core/mm.h>
  25
  26 #define node(root, dir) ((root)->nl_entry.dir == &mm->nodes) ? NULL :          \
  27         list_entry((root)->nl_entry.dir, struct nvkm_mm_node, nl_entry)
  28
  29 static void
  30 nvkm_mm_dump(struct nvkm_mm *mm, const char *header)
  31 {
  32         struct nvkm_mm_node *node;
  33
  34         printk(KERN_ERR "nvkm: %s\n", header);
  35         printk(KERN_ERR "nvkm: node list:\n");
  36         list_for_each_entry(node, &mm->nodes, nl_entry) {
  37                 printk(KERN_ERR "nvkm: \t%08x %08x %d\n",
  38                        node->offset, node->length, node->type);
  39         }
  40         printk(KERN_ERR "nvkm: free list:\n");
  41         list_for_each_entry(node, &mm->free, fl_entry) {
  42                 printk(KERN_ERR "nvkm: \t%08x %08x %d\n",
  43                        node->offset, node->length, node->type);
  44         }
  45 }
  46
  47 void
  48 nvkm_mm_free(struct nvkm_mm *mm, struct nvkm_mm_node **pthis)
  49 {
  50         struct nvkm_mm_node *this = *pthis;
  51
  52         if (this) {
  53                 struct nvkm_mm_node *prev = node(this, prev);
  54                 struct nvkm_mm_node *next = node(this, next);
  55
  56                 if (prev && prev->type == NVKM_MM_TYPE_NONE) {
  57                         prev->length += this->length;
  58                         list_del(&this->nl_entry);
  59                         kfree(this); this = prev;
  60                 }
  61
  62                 if (next && next->type == NVKM_MM_TYPE_NONE) {
  63                         next->offset  = this->offset;
  64                         next->length += this->length;
  65                         if (this->type == NVKM_MM_TYPE_NONE)
  66                                 list_del(&this->fl_entry);
  67                         list_del(&this->nl_entry);
  68                         kfree(this); this = NULL;
  69                 }
  70
  71                 if (this && this->type != NVKM_MM_TYPE_NONE) {
  72                         list_for_each_entry(prev, &mm->free, fl_entry) {
  73                                 if (this->offset < prev->offset)
  74                                         break;
  75                         }
  76
  77                         list_add_tail(&this->fl_entry, &prev->fl_entry);
  78                         this->type = NVKM_MM_TYPE_NONE;
  79                 }
  80         }
  81
  82         *pthis = NULL;
  83 }
  84
  85 static struct nvkm_mm_node *
  86 region_head(struct nvkm_mm *mm, struct nvkm_mm_node *a, u32 size)
  87 {
  88         struct nvkm_mm_node *b;
  89
  90         if (a->length == size)
  91                 return a;
  92
  93         b = kmalloc(sizeof(*b), GFP_KERNEL);
  94         if (unlikely(b == NULL))
  95                 return NULL;
  96
  97         b->offset = a->offset;
  98         b->length = size;
  99         b->heap   = a->heap;
 100         b->type   = a->type;
 101         a->offset += size;
 102         a->length -= size;
 103         list_add_tail(&b->nl_entry, &a->nl_entry);
 104         if (b->type == NVKM_MM_TYPE_NONE)
 105                 list_add_tail(&b->fl_entry, &a->fl_entry);
 106
 107         return b;
 108 }
 109
 110 int
 111 nvkm_mm_head(struct nvkm_mm *mm, u8 heap, u8 type, u32 size_max, u32 size_min,
 112              u32 align, struct nvkm_mm_node **pnode)
 113 {
 114         struct nvkm_mm_node *prev, *this, *next;
 115         u32 mask = align - 1;
 116         u32 splitoff;
 117         u32 s, e;
 118
 119         BUG_ON(type == NVKM_MM_TYPE_NONE || type == NVKM_MM_TYPE_HOLE);
 120
 121         list_for_each_entry(this, &mm->free, fl_entry) {
 122                 if (unlikely(heap != NVKM_MM_HEAP_ANY)) {
 123                         if (this->heap != heap)
 124                                 continue;
 125                 }
 126                 e = this->offset + this->length;
 127                 s = this->offset;
 128
 129                 prev = node(this, prev);
 130                 if (prev && prev->type != type)
 131                         s = roundup(s, mm->block_size);
 132
 133                 next = node(this, next);
 134                 if (next && next->type != type)
 135                         e = rounddown(e, mm->block_size);
 136
 137                 s  = (s + mask) & ~mask;
 138                 e &= ~mask;
 139                 if (s > e || e - s < size_min)
 140                         continue;
 141
 142                 splitoff = s - this->offset;
 143                 if (splitoff && !region_head(mm, this, splitoff))
 144                         return -ENOMEM;
 145
 146                 this = region_head(mm, this, min(size_max, e - s));
 147                 if (!this)
 148                         return -ENOMEM;
 149
 150                 this->type = type;
 151                 list_del(&this->fl_entry);
 152                 *pnode = this;
 153                 return 0;
 154         }
 155
 156         return -ENOSPC;
 157 }
 158
 159 static struct nvkm_mm_node *
 160 region_tail(struct nvkm_mm *mm, struct nvkm_mm_node *a, u32 size)
 161 {
 162         struct nvkm_mm_node *b;
 163
 164         if (a->length == size)
 165                 return a;
 166
 167         b = kmalloc(sizeof(*b), GFP_KERNEL);
 168         if (unlikely(b == NULL))
 169                 return NULL;
 170
 171         a->length -= size;
 172         b->offset  = a->offset + a->length;
 173         b->length  = size;
 174         b->heap    = a->heap;
 175         b->type    = a->type;
 176
 177         list_add(&b->nl_entry, &a->nl_entry);
 178         if (b->type == NVKM_MM_TYPE_NONE)
 179                 list_add(&b->fl_entry, &a->fl_entry);
 180
 181         return b;
 182 }
 183
 184 int
 185 nvkm_mm_tail(struct nvkm_mm *mm, u8 heap, u8 type, u32 size_max, u32 size_min,
 186              u32 align, struct nvkm_mm_node **pnode)
 187 {
 188         struct nvkm_mm_node *prev, *this, *next;
 189         u32 mask = align - 1;
 190
 191         BUG_ON(type == NVKM_MM_TYPE_NONE || type == NVKM_MM_TYPE_HOLE);
 192
 193         list_for_each_entry_reverse(this, &mm->free, fl_entry) {
 194                 u32 e = this->offset + this->length;
 195                 u32 s = this->offset;
 196                 u32 c = 0, a;
 197                 if (unlikely(heap != NVKM_MM_HEAP_ANY)) {
 198                         if (this->heap != heap)
 199                                 continue;
 200                 }
 201
 202                 prev = node(this, prev);
 203                 if (prev && prev->type != type)
 204                         s = roundup(s, mm->block_size);
 205
 206                 next = node(this, next);
 207                 if (next && next->type != type) {
 208                         e = rounddown(e, mm->block_size);
 209                         c = next->offset - e;
 210                 }
 211
 212                 s = (s + mask) & ~mask;
 213                 a = e - s;
 214                 if (s > e || a < size_min)
 215                         continue;
 216
 217                 a  = min(a, size_max);
 218                 s  = (e - a) & ~mask;
 219                 c += (e - s) - a;
 220
 221                 if (c && !region_tail(mm, this, c))
 222                         return -ENOMEM;
 223
 224                 this = region_tail(mm, this, a);
 225                 if (!this)
 226                         return -ENOMEM;
 227
 228                 this->type = type;
 229                 list_del(&this->fl_entry);
 230                 *pnode = this;
 231                 return 0;
 232         }
 233
 234         return -ENOSPC;
 235 }
 236
 237 int
 238 nvkm_mm_init(struct nvkm_mm *mm, u32 offset, u32 length, u32 block)
 239 {
 240         struct nvkm_mm_node *node, *prev;
 241         u32 next;
 242
 243         if (nvkm_mm_initialised(mm)) {
 244                 prev = list_last_entry(&mm->nodes, typeof(*node), nl_entry);
 245                 next = prev->offset + prev->length;
 246                 if (next != offset) {
 247                         BUG_ON(next > offset);
 248                         if (!(node = kzalloc(sizeof(*node), GFP_KERNEL)))
 249                                 return -ENOMEM;
 250                         node->type   = NVKM_MM_TYPE_HOLE;
 251                         node->offset = next;
 252                         node->length = offset - next;
 253                         list_add_tail(&node->nl_entry, &mm->nodes);
 254                 }
 255                 BUG_ON(block != mm->block_size);
 256         } else {
 257                 INIT_LIST_HEAD(&mm->nodes);
 258                 INIT_LIST_HEAD(&mm->free);
 259                 mm->block_size = block;
 260                 mm->heap_nodes = 0;
 261         }
 262
 263         node = kzalloc(sizeof(*node), GFP_KERNEL);
 264         if (!node)
 265                 return -ENOMEM;
 266
 267         if (length) {
 268                 node->offset  = roundup(offset, mm->block_size);
 269                 node->length  = rounddown(offset + length, mm->block_size);
 270                 node->length -= node->offset;
 271         }
 272
 273         list_add_tail(&node->nl_entry, &mm->nodes);
 274         list_add_tail(&node->fl_entry, &mm->free);
 275         node->heap = ++mm->heap_nodes;
 276         return 0;
 277 }
 278
 279 int
 280 nvkm_mm_fini(struct nvkm_mm *mm)
 281 {
 282         struct nvkm_mm_node *node, *temp;
 283         int nodes = 0;
 284
 285         if (!nvkm_mm_initialised(mm))
 286                 return 0;
 287
 288         list_for_each_entry(node, &mm->nodes, nl_entry) {
 289                 if (node->type != NVKM_MM_TYPE_HOLE) {
 290                         if (++nodes > mm->heap_nodes) {
 291                                 nvkm_mm_dump(mm, "mm not clean!");
 292                                 return -EBUSY;
 293                         }
 294                 }
 295         }
 296
 297         list_for_each_entry_safe(node, temp, &mm->nodes, nl_entry) {
 298                 list_del(&node->nl_entry);
 299                 kfree(node);
 300         }
 301
 302         mm->heap_nodes = 0;
 303         return 0;
 304 }