/*
* Copyright (c) 2016-2017, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
#ifndef BUDDY_ALLOCATOR_PRIV_H
#define BUDDY_ALLOCATOR_PRIV_H
#include
#include
struct nvgpu_kmem_cache;
struct nvgpu_allocator;
struct vm_gk20a;
/*
* Each buddy is an element in a binary tree.
*/
struct nvgpu_buddy {
struct nvgpu_buddy *parent; /* Parent node. */
struct nvgpu_buddy *buddy; /* This node's buddy. */
struct nvgpu_buddy *left; /* Lower address sub-node. */
struct nvgpu_buddy *right; /* Higher address sub-node. */
struct nvgpu_list_node buddy_entry; /* List entry for various lists. */
struct nvgpu_rbtree_node alloced_entry; /* RB tree of allocations. */
u64 start; /* Start address of this buddy. */
u64 end; /* End address of this buddy. */
u64 order; /* Buddy order. */
#define BALLOC_BUDDY_ALLOCED 0x1
#define BALLOC_BUDDY_SPLIT 0x2
#define BALLOC_BUDDY_IN_LIST 0x4
int flags; /* List of associated flags. */
/*
* Size of the PDE this buddy is using. This allows for grouping like
* sized allocations into the same PDE. This uses the gmmu_pgsz_gk20a
* enum except for the BALLOC_PTE_SIZE_ANY specifier.
*/
#define BALLOC_PTE_SIZE_ANY -1
int pte_size;
};
static inline struct nvgpu_buddy *
nvgpu_buddy_from_buddy_entry(struct nvgpu_list_node *node)
{
return (struct nvgpu_buddy *)
((uintptr_t)node - offsetof(struct nvgpu_buddy, buddy_entry));
};
static inline struct nvgpu_buddy *
nvgpu_buddy_from_rbtree_node(struct nvgpu_rbtree_node *node)
{
return (struct nvgpu_buddy *)
((uintptr_t)node - offsetof(struct nvgpu_buddy, alloced_entry));
};
#define __buddy_flag_ops(flag, flag_up) \
static inline int buddy_is_ ## flag(struct nvgpu_buddy *b) \
{ \
return b->flags & BALLOC_BUDDY_ ## flag_up; \
} \
static inline void buddy_set_ ## flag(struct nvgpu_buddy *b) \
{ \
b->flags |= BALLOC_BUDDY_ ## flag_up; \
} \
static inline void buddy_clr_ ## flag(struct nvgpu_buddy *b) \
{ \
b->flags &= ~BALLOC_BUDDY_ ## flag_up; \
}
/*
* int buddy_is_alloced(struct nvgpu_buddy *b);
* void buddy_set_alloced(struct nvgpu_buddy *b);
* void buddy_clr_alloced(struct nvgpu_buddy *b);
*
* int buddy_is_split(struct nvgpu_buddy *b);
* void buddy_set_split(struct nvgpu_buddy *b);
* void buddy_clr_split(struct nvgpu_buddy *b);
*
* int buddy_is_in_list(struct nvgpu_buddy *b);
* void buddy_set_in_list(struct nvgpu_buddy *b);
* void buddy_clr_in_list(struct nvgpu_buddy *b);
*/
__buddy_flag_ops(alloced, ALLOCED);
__buddy_flag_ops(split, SPLIT);
__buddy_flag_ops(in_list, IN_LIST);
/*
* Keeps info for a fixed allocation.
*/
struct nvgpu_fixed_alloc {
struct nvgpu_list_node buddies; /* List of buddies. */
struct nvgpu_rbtree_node alloced_entry; /* RB tree of fixed allocations. */
u64 start; /* Start of fixed block. */
u64 end; /* End address. */
};
static inline struct nvgpu_fixed_alloc *
nvgpu_fixed_alloc_from_rbtree_node(struct nvgpu_rbtree_node *node)
{
return (struct nvgpu_fixed_alloc *)
((uintptr_t)node - offsetof(struct nvgpu_fixed_alloc, alloced_entry));
};
/*
* GPU buddy allocator for the various GPU address spaces. Each addressable unit
* doesn't have to correspond to a byte. In some cases each unit is a more
* complex object such as a comp_tag line or the like.
*
* The max order is computed based on the size of the minimum order and the size
* of the address space.
*
* order_size is the size of an order 0 buddy.
*/
struct nvgpu_buddy_allocator {
struct nvgpu_allocator *owner; /* Owner of this buddy allocator. */
struct vm_gk20a *vm; /* Parent VM - can be NULL. */
u64 base; /* Base address of the space. */
u64 length; /* Length of the space. */
u64 blk_size; /* Size of order 0 allocation. */
u64 blk_shift; /* Shift to divide by blk_size. */
/* Internal stuff. */
u64 start; /* Real start (aligned to blk_size). */
u64 end; /* Real end, trimmed if needed. */
u64 count; /* Count of objects in space. */
u64 blks; /* Count of blks in the space. */
u64 max_order; /* Specific maximum order. */
struct nvgpu_rbtree_node *alloced_buddies; /* Outstanding allocations. */
struct nvgpu_rbtree_node *fixed_allocs; /* Outstanding fixed allocations. */
struct nvgpu_list_node co_list;
struct nvgpu_kmem_cache *buddy_cache;
/*
* Impose an upper bound on the maximum order.
*/
#define GPU_BALLOC_ORDER_LIST_LEN (GPU_BALLOC_MAX_ORDER + 1)
struct nvgpu_list_node buddy_list[GPU_BALLOC_ORDER_LIST_LEN];
u64 buddy_list_len[GPU_BALLOC_ORDER_LIST_LEN];
u64 buddy_list_split[GPU_BALLOC_ORDER_LIST_LEN];
u64 buddy_list_alloced[GPU_BALLOC_ORDER_LIST_LEN];
/*
* This is for when the allocator is managing a GVA space (the
* GPU_ALLOC_GVA_SPACE bit is set in @flags). This requires
* that we group like sized allocations into PDE blocks.
*/
u64 pte_blk_order;
int initialized;
int alloc_made; /* True after the first alloc. */
u64 flags;
u64 bytes_alloced;
u64 bytes_alloced_real;
u64 bytes_freed;
};
static inline struct nvgpu_buddy_allocator *buddy_allocator(
struct nvgpu_allocator *a)
{
return (struct nvgpu_buddy_allocator *)(a)->priv;
}
static inline struct nvgpu_list_node *balloc_get_order_list(
struct nvgpu_buddy_allocator *a, int order)
{
return &a->buddy_list[order];
}
static inline u64 balloc_order_to_len(struct nvgpu_buddy_allocator *a,
int order)
{
return (1 << order) * a->blk_size;
}
static inline u64 balloc_base_shift(struct nvgpu_buddy_allocator *a,
u64 base)
{
return base - a->start;
}
static inline u64 balloc_base_unshift(struct nvgpu_buddy_allocator *a,
u64 base)
{
return base + a->start;
}
static inline struct nvgpu_allocator *balloc_owner(
struct nvgpu_buddy_allocator *a)
{
return a->owner;
}
#endif