diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nouveau_mm.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_mm.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_mm.c b/drivers/gpu/drm/nouveau/nouveau_mm.c new file mode 100644 index 000000000000..8844b50c3e54 --- /dev/null +++ b/drivers/gpu/drm/nouveau/nouveau_mm.c @@ -0,0 +1,171 @@ +/* + * Copyright 2010 Red Hat Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * Authors: Ben Skeggs + */ + +#include "drmP.h" +#include "nouveau_drv.h" +#include "nouveau_mm.h" + +static inline void +region_put(struct nouveau_mm *rmm, struct nouveau_mm_node *a) +{ + list_del(&a->nl_entry); + list_del(&a->fl_entry); + kfree(a); +} + +static struct nouveau_mm_node * +region_split(struct nouveau_mm *rmm, struct nouveau_mm_node *a, u32 size) +{ + struct nouveau_mm_node *b; + + if (a->length == size) + return a; + + b = kmalloc(sizeof(*b), GFP_KERNEL); + if (unlikely(b == NULL)) + return NULL; + + b->offset = a->offset; + b->length = size; + b->type = a->type; + a->offset += size; + a->length -= size; + list_add_tail(&b->nl_entry, &a->nl_entry); + if (b->type == 0) + list_add_tail(&b->fl_entry, &a->fl_entry); + return b; +} + +#define node(root, dir) ((root)->nl_entry.dir == &rmm->nodes) ? NULL : \ + list_entry((root)->nl_entry.dir, struct nouveau_mm_node, nl_entry) + +void +nouveau_mm_put(struct nouveau_mm *rmm, struct nouveau_mm_node *this) +{ + struct nouveau_mm_node *prev = node(this, prev); + struct nouveau_mm_node *next = node(this, next); + + list_add(&this->fl_entry, &rmm->free); + this->type = 0; + + if (prev && prev->type == 0) { + prev->length += this->length; + region_put(rmm, this); + this = prev; + } + + if (next && next->type == 0) { + next->offset = this->offset; + next->length += this->length; + region_put(rmm, this); + } +} + +int +nouveau_mm_get(struct nouveau_mm *rmm, int type, u32 size, u32 size_nc, + u32 align, struct nouveau_mm_node **pnode) +{ + struct nouveau_mm_node *prev, *this, *next; + u32 min = size_nc ? size_nc : size; + u32 align_mask = align - 1; + u32 splitoff; + u32 s, e; + + list_for_each_entry(this, &rmm->free, fl_entry) { + e = this->offset + this->length; + s = this->offset; + + prev = node(this, prev); + if (prev && prev->type != type) + s = roundup(s, rmm->block_size); + + next = node(this, next); + if (next && next->type != type) + e = rounddown(e, rmm->block_size); + + s = (s + align_mask) & ~align_mask; + e &= ~align_mask; + if (s > e || e - s < min) + continue; + + splitoff = s - this->offset; + if (splitoff && !region_split(rmm, this, splitoff)) + return -ENOMEM; + + this = region_split(rmm, this, min(size, e - s)); + if (!this) + return -ENOMEM; + + this->type = type; + list_del(&this->fl_entry); + *pnode = this; + return 0; + } + + return -ENOMEM; +} + +int +nouveau_mm_init(struct nouveau_mm **prmm, u32 offset, u32 length, u32 block) +{ + struct nouveau_mm *rmm; + struct nouveau_mm_node *heap; + + heap = kzalloc(sizeof(*heap), GFP_KERNEL); + if (!heap) + return -ENOMEM; + heap->offset = roundup(offset, block); + heap->length = rounddown(offset + length, block) - heap->offset; + + rmm = kzalloc(sizeof(*rmm), GFP_KERNEL); + if (!rmm) { + kfree(heap); + return -ENOMEM; + } + rmm->block_size = block; + mutex_init(&rmm->mutex); + INIT_LIST_HEAD(&rmm->nodes); + INIT_LIST_HEAD(&rmm->free); + list_add(&heap->nl_entry, &rmm->nodes); + list_add(&heap->fl_entry, &rmm->free); + + *prmm = rmm; + return 0; +} + +int +nouveau_mm_fini(struct nouveau_mm **prmm) +{ + struct nouveau_mm *rmm = *prmm; + struct nouveau_mm_node *heap = + list_first_entry(&rmm->nodes, struct nouveau_mm_node, nl_entry); + + if (!list_is_singular(&rmm->nodes)) + return -EBUSY; + + kfree(heap); + kfree(rmm); + *prmm = NULL; + return 0; +} |