u-boot/include/lmb.h
Patrick Delaunay 6d66502bc7 lmb: Add 2 config to define the max number of regions
Add 2 configs CONFIG_LMB_MEMORY_REGIONS and CONFIG_LMB_RESERVED_REGIONS
to change independently the max number of the regions in lmb
library.

When CONFIG_LMB_USE_MAX_REGIONS=y, move the lmb property arrays to
struct lmb and manage the array size with the element 'max' of struct
lmb_region; their are still allocated in stack.

When CONFIG_LMB_USE_MAX_REGIONS=n, keep the current location in
struct lmb_region to allow compiler optimization.

Increase CONFIG_LMB_RESERVED_REGIONS is useful to avoid lmb errors in
bootm when the number of reserved regions (not adjacent) is reached:
+ 1 region for relocated U-Boot
+ 1 region for initrd
+ 1 region for relocated linux device tree
+ reserved memory regions present in Linux device tree.

The current limit of 8 regions is reached with only 5 reserved regions
in DT.

see Linux kernel commit bf23c51f1f49 ("memblock: Move memblock arrays
to static storage in memblock.c and make their size a variable")

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
2021-04-22 14:09:45 -04:00

97 lines
2.9 KiB
C

/* SPDX-License-Identifier: GPL-2.0+ */
#ifndef _LINUX_LMB_H
#define _LINUX_LMB_H
#ifdef __KERNEL__
#include <asm/types.h>
#include <asm/u-boot.h>
/*
* Logical memory blocks.
*
* Copyright (C) 2001 Peter Bergner, IBM Corp.
*/
/**
* struct lmb_property - Description of one region.
*
* @base: Base address of the region.
* @size: Size of the region
*/
struct lmb_property {
phys_addr_t base;
phys_size_t size;
};
/**
* struct lmb_region - Description of a set of region.
*
* @cnt: Number of regions.
* @max: Size of the region array, max value of cnt.
* @region: Array of the region properties
*/
struct lmb_region {
unsigned long cnt;
unsigned long max;
#if IS_ENABLED(CONFIG_LMB_USE_MAX_REGIONS)
struct lmb_property region[CONFIG_LMB_MAX_REGIONS];
#else
struct lmb_property *region;
#endif
};
/**
* struct lmb - Logical memory block handle.
*
* Clients provide storage for Logical memory block (lmb) handles.
* The content of the structure is managed by the lmb library.
* A lmb struct is initialized by lmb_init() functions.
* The lmb struct is passed to all other lmb APIs.
*
* @memory: Description of memory regions.
* @reserved: Description of reserved regions.
* @memory_regions: Array of the memory regions (statically allocated)
* @reserved_regions: Array of the reserved regions (statically allocated)
*/
struct lmb {
struct lmb_region memory;
struct lmb_region reserved;
#if !IS_ENABLED(CONFIG_LMB_USE_MAX_REGIONS)
struct lmb_property memory_regions[CONFIG_LMB_MEMORY_REGIONS];
struct lmb_property reserved_regions[CONFIG_LMB_RESERVED_REGIONS];
#endif
};
extern void lmb_init(struct lmb *lmb);
extern void lmb_init_and_reserve(struct lmb *lmb, struct bd_info *bd,
void *fdt_blob);
extern void lmb_init_and_reserve_range(struct lmb *lmb, phys_addr_t base,
phys_size_t size, void *fdt_blob);
extern long lmb_add(struct lmb *lmb, phys_addr_t base, phys_size_t size);
extern long lmb_reserve(struct lmb *lmb, phys_addr_t base, phys_size_t size);
extern phys_addr_t lmb_alloc(struct lmb *lmb, phys_size_t size, ulong align);
extern phys_addr_t lmb_alloc_base(struct lmb *lmb, phys_size_t size, ulong align,
phys_addr_t max_addr);
extern phys_addr_t __lmb_alloc_base(struct lmb *lmb, phys_size_t size, ulong align,
phys_addr_t max_addr);
extern phys_addr_t lmb_alloc_addr(struct lmb *lmb, phys_addr_t base,
phys_size_t size);
extern phys_size_t lmb_get_free_size(struct lmb *lmb, phys_addr_t addr);
extern int lmb_is_reserved(struct lmb *lmb, phys_addr_t addr);
extern long lmb_free(struct lmb *lmb, phys_addr_t base, phys_size_t size);
extern void lmb_dump_all(struct lmb *lmb);
extern void lmb_dump_all_force(struct lmb *lmb);
static inline phys_size_t
lmb_size_bytes(struct lmb_region *type, unsigned long region_nr)
{
return type->region[region_nr].size;
}
void board_lmb_reserve(struct lmb *lmb);
void arch_lmb_reserve(struct lmb *lmb);
#endif /* __KERNEL__ */
#endif /* _LINUX_LMB_H */