mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-21 02:49:14 +07:00
14d1b9a624
Simple buddy allocator. We want to allocate properly aligned power-of-two blocks to promote usage of huge-pages for the GTT, so 64K, 2M and possibly even 1G. While we do support allocating stuff at a specific offset, it is more intended for preallocating portions of the address space, say for an initial framebuffer, for other uses drm_mm is probably a much better fit. Anyway, hopefully this can all be thrown away if we eventually move to having the core MM manage device memory. Signed-off-by: Matthew Auld <matthew.auld@intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20190809202926.14545-2-matthew.auld@intel.com
129 lines
3.3 KiB
C
129 lines
3.3 KiB
C
/* SPDX-License-Identifier: MIT */
|
|
/*
|
|
* Copyright © 2019 Intel Corporation
|
|
*/
|
|
|
|
#ifndef __I915_BUDDY_H__
|
|
#define __I915_BUDDY_H__
|
|
|
|
#include <linux/bitops.h>
|
|
#include <linux/list.h>
|
|
|
|
struct i915_buddy_block {
|
|
#define I915_BUDDY_HEADER_OFFSET GENMASK_ULL(63, 12)
|
|
#define I915_BUDDY_HEADER_STATE GENMASK_ULL(11, 10)
|
|
#define I915_BUDDY_ALLOCATED (1 << 10)
|
|
#define I915_BUDDY_FREE (2 << 10)
|
|
#define I915_BUDDY_SPLIT (3 << 10)
|
|
#define I915_BUDDY_HEADER_ORDER GENMASK_ULL(9, 0)
|
|
u64 header;
|
|
|
|
struct i915_buddy_block *left;
|
|
struct i915_buddy_block *right;
|
|
struct i915_buddy_block *parent;
|
|
|
|
void *private; /* owned by creator */
|
|
|
|
/*
|
|
* While the block is allocated by the user through i915_buddy_alloc*,
|
|
* the user has ownership of the link, for example to maintain within
|
|
* a list, if so desired. As soon as the block is freed with
|
|
* i915_buddy_free* ownership is given back to the mm.
|
|
*/
|
|
struct list_head link;
|
|
struct list_head tmp_link;
|
|
};
|
|
|
|
#define I915_BUDDY_MAX_ORDER I915_BUDDY_HEADER_ORDER
|
|
|
|
/*
|
|
* Binary Buddy System.
|
|
*
|
|
* Locking should be handled by the user, a simple mutex around
|
|
* i915_buddy_alloc* and i915_buddy_free* should suffice.
|
|
*/
|
|
struct i915_buddy_mm {
|
|
/* Maintain a free list for each order. */
|
|
struct list_head *free_list;
|
|
|
|
/*
|
|
* Maintain explicit binary tree(s) to track the allocation of the
|
|
* address space. This gives us a simple way of finding a buddy block
|
|
* and performing the potentially recursive merge step when freeing a
|
|
* block. Nodes are either allocated or free, in which case they will
|
|
* also exist on the respective free list.
|
|
*/
|
|
struct i915_buddy_block **roots;
|
|
|
|
/*
|
|
* Anything from here is public, and remains static for the lifetime of
|
|
* the mm. Everything above is considered do-not-touch.
|
|
*/
|
|
unsigned int n_roots;
|
|
unsigned int max_order;
|
|
|
|
/* Must be at least PAGE_SIZE */
|
|
u64 chunk_size;
|
|
u64 size;
|
|
};
|
|
|
|
static inline u64
|
|
i915_buddy_block_offset(struct i915_buddy_block *block)
|
|
{
|
|
return block->header & I915_BUDDY_HEADER_OFFSET;
|
|
}
|
|
|
|
static inline unsigned int
|
|
i915_buddy_block_order(struct i915_buddy_block *block)
|
|
{
|
|
return block->header & I915_BUDDY_HEADER_ORDER;
|
|
}
|
|
|
|
static inline unsigned int
|
|
i915_buddy_block_state(struct i915_buddy_block *block)
|
|
{
|
|
return block->header & I915_BUDDY_HEADER_STATE;
|
|
}
|
|
|
|
static inline bool
|
|
i915_buddy_block_is_allocated(struct i915_buddy_block *block)
|
|
{
|
|
return i915_buddy_block_state(block) == I915_BUDDY_ALLOCATED;
|
|
}
|
|
|
|
static inline bool
|
|
i915_buddy_block_is_free(struct i915_buddy_block *block)
|
|
{
|
|
return i915_buddy_block_state(block) == I915_BUDDY_FREE;
|
|
}
|
|
|
|
static inline bool
|
|
i915_buddy_block_is_split(struct i915_buddy_block *block)
|
|
{
|
|
return i915_buddy_block_state(block) == I915_BUDDY_SPLIT;
|
|
}
|
|
|
|
static inline u64
|
|
i915_buddy_block_size(struct i915_buddy_mm *mm,
|
|
struct i915_buddy_block *block)
|
|
{
|
|
return mm->chunk_size << i915_buddy_block_order(block);
|
|
}
|
|
|
|
int i915_buddy_init(struct i915_buddy_mm *mm, u64 size, u64 chunk_size);
|
|
|
|
void i915_buddy_fini(struct i915_buddy_mm *mm);
|
|
|
|
struct i915_buddy_block *
|
|
i915_buddy_alloc(struct i915_buddy_mm *mm, unsigned int order);
|
|
|
|
int i915_buddy_alloc_range(struct i915_buddy_mm *mm,
|
|
struct list_head *blocks,
|
|
u64 start, u64 size);
|
|
|
|
void i915_buddy_free(struct i915_buddy_mm *mm, struct i915_buddy_block *block);
|
|
|
|
void i915_buddy_free_list(struct i915_buddy_mm *mm, struct list_head *objects);
|
|
|
|
#endif
|