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/*
* This file is part of the SPL: Solaris Porting Layer.
*
* Copyright (c) 2008 Lawrence Livermore National Security, LLC.
* Produced at Lawrence Livermore National Laboratory
* Written by:
* Brian Behlendorf <behlendorf1@llnl.gov>,
* Herb Wartens <wartens2@llnl.gov>,
* Jim Garlick <garlick@llnl.gov>
* UCRL-CODE-235197
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This is distributed in the hope that 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef _SPL_VMSYSTM_H
#define _SPL_VMSYSTM_H
#include <linux/mmzone.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/highmem.h>
#include <sys/types.h>
#include <asm/uaccess.h>
/* These values are loosely coupled with the VM page reclaim.
* Linux uses its own heuristics to trigger page reclamation, and
* because those interface are difficult to interface with. These
* values should only be considered as a rough guide to the system
* memory state and not as direct evidence that page reclamation.
* is or is not currently in progress.
*/
#define membar_producer() smp_wmb()
#define physmem num_physpages
#define freemem nr_free_pages()
#define availrmem spl_kmem_availrmem()
extern pgcnt_t minfree; /* Sum of zone->pages_min */
extern pgcnt_t desfree; /* Sum of zone->pages_low */
extern pgcnt_t lotsfree; /* Sum of zone->pages_high */
extern pgcnt_t needfree; /* Always 0 unused in new Solaris */
extern pgcnt_t swapfs_minfree; /* Solaris default value */
extern pgcnt_t swapfs_reserve; /* Solaris default value */
extern vmem_t *heap_arena; /* primary kernel heap arena */
extern vmem_t *zio_alloc_arena; /* arena for zio caches */
extern vmem_t *zio_arena; /* arena for allocating zio memory */
extern pgcnt_t spl_kmem_availrmem(void);
extern size_t vmem_size(vmem_t *vmp, int typemask);
/*
* The following symbols are available for use within the kernel
* itself, and they used to be available in older kernels. But it
* looks like they have been removed perhaps due to lack of use.
* For our purposes we need them to access the global memory state
* of the system, which is even available to user space process
* in /proc/meminfo. It's odd to me that there is no kernel API
* to get the same information, minimally the proc handler for
* the above mentioned /proc/meminfo file would make use of it.
*/
/* Source linux/fs/proc/mmu.c */
#ifndef HAVE_GET_VMALLOC_INFO
#ifdef CONFIG_MMU
struct vmalloc_info {
unsigned long used;
unsigned long largest_chunk;
};
typedef void (*get_vmalloc_info_t)(struct vmalloc_info *);
extern get_vmalloc_info_t get_vmalloc_info_fn;
# define VMEM_ALLOC 0x01
# define VMEM_FREE 0x02
# define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
# define get_vmalloc_info(vmi) get_vmalloc_info_fn(vmi)
#else
# error "CONFIG_MMU must be defined"
#endif /* CONFIG_MMU */
#endif /* HAVE_GET_VMALLOC_INFO */
#ifdef HAVE_PGDAT_HELPERS
/* Source linux/mm/mmzone.c */
# ifndef HAVE_FIRST_ONLINE_PGDAT
typedef struct pglist_data *(*first_online_pgdat_t)(void);
extern first_online_pgdat_t first_online_pgdat_fn;
# define first_online_pgdat() first_online_pgdat_fn()
# endif /* HAVE_FIRST_ONLINE_PGDAT */
# ifndef HAVE_NEXT_ONLINE_PGDAT
typedef struct pglist_data *(*next_online_pgdat_t)(struct pglist_data *);
extern next_online_pgdat_t next_online_pgdat_fn;
# define next_online_pgdat(pgd) next_online_pgdat_fn(pgd)
# endif /* HAVE_NEXT_ONLINE_PGDAT */
# ifndef HAVE_NEXT_ZONE
typedef struct zone *(*next_zone_t)(struct zone *);
extern next_zone_t next_zone_fn;
# define next_zone(zone) next_zone_fn(zone)
# endif /* HAVE_NEXT_ZONE */
#else /* HAVE_PGDAT_HELPERS */
# ifndef HAVE_PGDAT_LIST
extern struct pglist_data *pgdat_list_addr;
# define pgdat_list pgdat_list_addr
# endif /* HAVE_PGDAT_LIST */
#endif /* HAVE_PGDAT_HELPERS */
/* Source linux/mm/vmstat.c */
#if defined(NEED_GET_ZONE_COUNTS) && !defined(HAVE_GET_ZONE_COUNTS)
typedef void (*get_zone_counts_t)(unsigned long *, unsigned long *,
unsigned long *);
extern get_zone_counts_t get_zone_counts_fn;
# define get_zone_counts(a,i,f) get_zone_counts_fn(a,i,f)
#endif /* NEED_GET_ZONE_COUNTS && !HAVE_GET_ZONE_COUNTS */
typedef enum spl_zone_stat_item {
SPL_NR_FREE_PAGES,
SPL_NR_INACTIVE,
SPL_NR_ACTIVE,
SPL_NR_ZONE_STAT_ITEMS
} spl_zone_stat_item_t;
extern unsigned long spl_global_page_state(spl_zone_stat_item_t);
#define xcopyin(from, to, size) copy_from_user(to, from, size)
#define xcopyout(from, to, size) copy_to_user(to, from, size)
static __inline__ int
copyin(const void *from, void *to, size_t len)
{
/* On error copyin routine returns -1 */
if (xcopyin(from, to, len))
return -1;
return 0;
}
static __inline__ int
copyout(const void *from, void *to, size_t len)
{
/* On error copyout routine returns -1 */
if (xcopyout(from, to, len))
return -1;
return 0;
}
static __inline__ int
copyinstr(const void *from, void *to, size_t len, size_t *done)
{
size_t rc;
if (len == 0)
return -ENAMETOOLONG;
/* XXX: Should return ENAMETOOLONG if 'strlen(from) > len' */
memset(to, 0, len);
rc = copyin(from, to, len - 1);
if (done != NULL)
*done = rc;
return 0;
}
#endif /* SPL_VMSYSTM_H */
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