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d04c8a563c
This patch is another step towards updating the code to handle the 32-bit kernels which I have not been regularly testing. This changes do not really impact the common case I'm expected which is the latest kernel running on an x86_64 arch. Until the linux-2.6.31 kernel the x86 arch did not have support for 64-bit atomic operations. Additionally, the new atomic_compat.h support for this case was wrong because it embedded a spinlock in the atomic variable which must always and only be 64-bits total. To handle these 32-bit issues we now simply fall back to the --enable-atomic-spinlock implementation if the kernel does not provide the 64-bit atomic funcs. The second issue this patch addresses is the DEBUG_KMEM assumption that there will always be atomic64 funcs available. On 32-bit archs this may not be true, and actually that's just fine. In that case the kernel will will never be able to allocate more the 32-bits worth anyway. So just check if atomic64 funcs are available, if they are not it means this is a 32-bit machine and we can safely use atomic_t's instead.
419 lines
15 KiB
C
419 lines
15 KiB
C
/*
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* This file is part of the SPL: Solaris Porting Layer.
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*
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* Copyright (c) 2008 Lawrence Livermore National Security, LLC.
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* Produced at Lawrence Livermore National Laboratory
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* Written by:
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* Brian Behlendorf <behlendorf1@llnl.gov>,
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* Herb Wartens <wartens2@llnl.gov>,
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* Jim Garlick <garlick@llnl.gov>
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* UCRL-CODE-235197
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*
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* This is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef _SPL_KMEM_H
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#define _SPL_KMEM_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#undef DEBUG_KMEM_UNIMPLEMENTED
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/mm_compat.h>
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#include <linux/spinlock.h>
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#include <linux/rwsem.h>
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#include <linux/hash.h>
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#include <linux/ctype.h>
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#include <asm/atomic.h>
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#include <sys/types.h>
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#include <sys/debug.h>
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#include <sys/vmsystm.h>
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/*
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* Memory allocation interfaces
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*/
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#define KM_SLEEP GFP_KERNEL
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#define KM_NOSLEEP GFP_ATOMIC
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#undef KM_PANIC /* No linux analog */
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#define KM_PUSHPAGE (KM_SLEEP | __GFP_HIGH)
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#define KM_VMFLAGS GFP_LEVEL_MASK
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#define KM_FLAGS __GFP_BITS_MASK
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/*
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* Used internally, the kernel does not need to support this flag
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*/
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#ifndef __GFP_ZERO
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# define __GFP_ZERO 0x8000
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#endif
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/*
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* __GFP_NOFAIL looks like it will be removed from the kernel perhaps as
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* early as 2.6.32. To avoid this issue when it occurs in upstream kernels
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* we retry the allocation here as long as it is not __GFP_WAIT (GFP_ATOMIC).
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* I would prefer the caller handle the failure case cleanly but we are
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* trying to emulate Solaris and those are not the Solaris semantics.
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*/
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static inline void *
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kmalloc_nofail(size_t size, gfp_t flags)
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{
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void *ptr;
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do {
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ptr = kmalloc(size, flags);
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} while (ptr == NULL && (flags & __GFP_WAIT));
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return ptr;
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}
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static inline void *
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kzalloc_nofail(size_t size, gfp_t flags)
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{
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void *ptr;
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do {
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ptr = kzalloc(size, flags);
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} while (ptr == NULL && (flags & __GFP_WAIT));
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return ptr;
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}
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#ifdef HAVE_KMALLOC_NODE
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static inline void *
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kmalloc_node_nofail(size_t size, gfp_t flags, int node)
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{
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void *ptr;
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do {
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ptr = kmalloc_node(size, flags, node);
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} while (ptr == NULL && (flags & __GFP_WAIT));
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return ptr;
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}
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#endif /* HAVE_KMALLOC_NODE */
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#ifdef DEBUG_KMEM
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# ifdef HAVE_ATOMIC64_T
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extern atomic64_t kmem_alloc_used;
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extern unsigned long long kmem_alloc_max;
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extern atomic64_t vmem_alloc_used;
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extern unsigned long long vmem_alloc_max;
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# define kmem_alloc_used_add(size) atomic64_add(size, &kmem_alloc_used)
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# define kmem_alloc_used_sub(size) atomic64_sub(size, &kmem_alloc_used)
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# define kmem_alloc_used_read() atomic64_read(&kmem_alloc_used)
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# define kmem_alloc_used_set(size) atomic64_set(&kmem_alloc_used, size)
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# define vmem_alloc_used_add(size) atomic64_add(size, &vmem_alloc_used)
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# define vmem_alloc_used_sub(size) atomic64_sub(size, &vmem_alloc_used)
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# define vmem_alloc_used_read() atomic64_read(&vmem_alloc_used)
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# define vmem_alloc_used_set(size) atomic64_set(&vmem_alloc_used, size)
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# else
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extern atomic_t kmem_alloc_used;
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extern unsigned long long kmem_alloc_max;
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extern atomic_t vmem_alloc_used;
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extern unsigned long long vmem_alloc_max;
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# define kmem_alloc_used_add(size) atomic_add(size, &kmem_alloc_used)
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# define kmem_alloc_used_sub(size) atomic_sub(size, &kmem_alloc_used)
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# define kmem_alloc_used_read() atomic_read(&kmem_alloc_used)
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# define kmem_alloc_used_set(size) atomic_set(&kmem_alloc_used, size)
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# define vmem_alloc_used_add(size) atomic_add(size, &vmem_alloc_used)
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# define vmem_alloc_used_sub(size) atomic_sub(size, &vmem_alloc_used)
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# define vmem_alloc_used_read() atomic_read(&vmem_alloc_used)
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# define vmem_alloc_used_set(size) atomic_set(&vmem_alloc_used, size)
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# endif /* _LP64 */
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# define kmem_alloc(size, flags) __kmem_alloc((size), (flags), 0, 0)
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# define kmem_zalloc(size, flags) __kmem_alloc((size), ((flags) | \
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__GFP_ZERO), 0, 0)
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/* The node alloc functions are only used by the SPL code itself */
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# ifdef HAVE_KMALLOC_NODE
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# define kmem_alloc_node(size, flags, node) __kmem_alloc((size), (flags), 1, \
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node)
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# else
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# define kmem_alloc_node(size, flags, node) __kmem_alloc((size), (flags), 0, 0)
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# endif
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# define vmem_zalloc(size, flags) vmem_alloc((size), ((flags) | \
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__GFP_ZERO))
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# ifdef DEBUG_KMEM_TRACKING
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extern void *kmem_alloc_track(size_t size, int flags, const char *func,
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int line, int node_alloc, int node);
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extern void kmem_free_track(void *ptr, size_t size);
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extern void *vmem_alloc_track(size_t size, int flags, const char *func,
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int line);
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extern void vmem_free_track(void *ptr, size_t size);
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# define __kmem_alloc(size, flags, na, node) kmem_alloc_track((size), \
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(flags), __FUNCTION__, \
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__LINE__, (na), (node))
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# define kmem_free(ptr, size) kmem_free_track((ptr), (size))
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# define vmem_alloc(size, flags) vmem_alloc_track((size), \
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(flags),__FUNCTION__, \
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__LINE__)
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# define vmem_free(ptr, size) vmem_free_track((ptr), (size))
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# else /* DEBUG_KMEM_TRACKING */
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extern void *kmem_alloc_debug(size_t size, int flags, const char *func,
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int line, int node_alloc, int node);
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extern void kmem_free_debug(void *ptr, size_t size);
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extern void *vmem_alloc_debug(size_t size, int flags, const char *func,
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int line);
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extern void vmem_free_debug(void *ptr, size_t size);
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# define __kmem_alloc(size, flags, na, node) kmem_alloc_debug((size), \
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(flags), __FUNCTION__, \
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__LINE__, (na), (node))
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# define kmem_free(ptr, size) kmem_free_debug((ptr), (size))
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# define vmem_alloc(size, flags) vmem_alloc_debug((size), \
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(flags), __FUNCTION__, \
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__LINE__)
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# define vmem_free(ptr, size) vmem_free_debug((ptr), (size))
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# endif /* DEBUG_KMEM_TRACKING */
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#else /* DEBUG_KMEM */
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# define kmem_alloc(size, flags) kmalloc_nofail((size), (flags))
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# define kmem_zalloc(size, flags) kzalloc_nofail((size), (flags))
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# define kmem_free(ptr, size) ((void)(size), kfree(ptr))
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# ifdef HAVE_KMALLOC_NODE
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# define kmem_alloc_node(size, flags, node) \
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kmalloc_node_nofail((size), (flags), (node))
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# else
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# define kmem_alloc_node(size, flags, node) \
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kmalloc_nofail((size), (flags))
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# endif
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# define vmem_alloc(size, flags) __vmalloc((size), ((flags) | \
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__GFP_HIGHMEM), PAGE_KERNEL)
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# define vmem_zalloc(size, flags) \
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({ \
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void *_ptr_ = __vmalloc((size),((flags)|__GFP_HIGHMEM),PAGE_KERNEL); \
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if (_ptr_) \
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memset(_ptr_, 0, (size)); \
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_ptr_; \
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})
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# define vmem_free(ptr, size) ((void)(size), vfree(ptr))
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#endif /* DEBUG_KMEM */
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#ifdef DEBUG_KMEM_UNIMPLEMENTED
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static __inline__ void *
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kmem_alloc_tryhard(size_t size, size_t *alloc_size, int kmflags)
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{
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#error "kmem_alloc_tryhard() not implemented"
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}
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#endif /* DEBUG_KMEM_UNIMPLEMENTED */
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/*
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* Slab allocation interfaces
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*/
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enum {
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KMC_BIT_NOTOUCH = 0, /* Don't update ages */
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KMC_BIT_NODEBUG = 1, /* Default behavior */
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KMC_BIT_NOMAGAZINE = 2, /* XXX: Unsupported */
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KMC_BIT_NOHASH = 3, /* XXX: Unsupported */
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KMC_BIT_QCACHE = 4, /* XXX: Unsupported */
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KMC_BIT_KMEM = 5, /* Use kmem cache */
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KMC_BIT_VMEM = 6, /* Use vmem cache */
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KMC_BIT_OFFSLAB = 7, /* Objects not on slab */
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KMC_BIT_REAPING = 16, /* Reaping in progress */
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KMC_BIT_DESTROY = 17, /* Destroy in progress */
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};
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#define KMC_NOTOUCH (1 << KMC_BIT_NOTOUCH)
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#define KMC_NODEBUG (1 << KMC_BIT_NODEBUG)
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#define KMC_NOMAGAZINE (1 << KMC_BIT_NOMAGAZINE)
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#define KMC_NOHASH (1 << KMC_BIT_NOHASH)
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#define KMC_QCACHE (1 << KMC_BIT_QCACHE)
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#define KMC_KMEM (1 << KMC_BIT_KMEM)
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#define KMC_VMEM (1 << KMC_BIT_VMEM)
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#define KMC_OFFSLAB (1 << KMC_BIT_OFFSLAB)
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#define KMC_REAPING (1 << KMC_BIT_REAPING)
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#define KMC_DESTROY (1 << KMC_BIT_DESTROY)
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#define KMC_REAP_CHUNK INT_MAX
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#define KMC_DEFAULT_SEEKS 1
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#ifdef DEBUG_KMEM_UNIMPLEMENTED
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static __inline__ void kmem_init(void) {
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#error "kmem_init() not implemented"
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}
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static __inline__ void kmem_thread_init(void) {
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#error "kmem_thread_init() not implemented"
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}
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static __inline__ void kmem_mp_init(void) {
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#error "kmem_mp_init() not implemented"
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}
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static __inline__ void kmem_reap_idspace(void) {
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#error "kmem_reap_idspace() not implemented"
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}
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static __inline__ size_t kmem_avail(void) {
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#error "kmem_avail() not implemented"
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}
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static __inline__ size_t kmem_maxavail(void) {
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#error "kmem_maxavail() not implemented"
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}
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static __inline__ uint64_t kmem_cache_stat(spl_kmem_cache_t *cache) {
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#error "kmem_cache_stat() not implemented"
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}
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#endif /* DEBUG_KMEM_UNIMPLEMENTED */
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/* XXX - Used by arc.c to adjust its memory footprint. We may want
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* to use this hook in the future to adjust behavior based on
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* debug levels. For now it's safe to always return 0.
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*/
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static __inline__ int
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kmem_debugging(void)
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{
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return 0;
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}
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extern int kmem_set_warning(int flag);
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extern struct list_head spl_kmem_cache_list;
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extern struct rw_semaphore spl_kmem_cache_sem;
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#define SKM_MAGIC 0x2e2e2e2e
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#define SKO_MAGIC 0x20202020
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#define SKS_MAGIC 0x22222222
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#define SKC_MAGIC 0x2c2c2c2c
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#define SPL_KMEM_CACHE_DELAY 15 /* Minimum slab release age */
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#define SPL_KMEM_CACHE_REAP 0 /* Default reap everything */
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#define SPL_KMEM_CACHE_OBJ_PER_SLAB 32 /* Target objects per slab */
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#define SPL_KMEM_CACHE_OBJ_PER_SLAB_MIN 8 /* Minimum objects per slab */
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#define SPL_KMEM_CACHE_ALIGN 8 /* Default object alignment */
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typedef int (*spl_kmem_ctor_t)(void *, void *, int);
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typedef void (*spl_kmem_dtor_t)(void *, void *);
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typedef void (*spl_kmem_reclaim_t)(void *);
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typedef struct spl_kmem_magazine {
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uint32_t skm_magic; /* Sanity magic */
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uint32_t skm_avail; /* Available objects */
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uint32_t skm_size; /* Magazine size */
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uint32_t skm_refill; /* Batch refill size */
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struct spl_kmem_cache *skm_cache; /* Owned by cache */
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struct delayed_work skm_work; /* Magazine reclaim work */
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unsigned long skm_age; /* Last cache access */
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void *skm_objs[0]; /* Object pointers */
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} spl_kmem_magazine_t;
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typedef struct spl_kmem_obj {
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uint32_t sko_magic; /* Sanity magic */
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void *sko_addr; /* Buffer address */
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struct spl_kmem_slab *sko_slab; /* Owned by slab */
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struct list_head sko_list; /* Free object list linkage */
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} spl_kmem_obj_t;
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typedef struct spl_kmem_slab {
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uint32_t sks_magic; /* Sanity magic */
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uint32_t sks_objs; /* Objects per slab */
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struct spl_kmem_cache *sks_cache; /* Owned by cache */
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struct list_head sks_list; /* Slab list linkage */
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struct list_head sks_free_list; /* Free object list */
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unsigned long sks_age; /* Last modify jiffie */
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uint32_t sks_ref; /* Ref count used objects */
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} spl_kmem_slab_t;
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typedef struct spl_kmem_cache {
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uint32_t skc_magic; /* Sanity magic */
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uint32_t skc_name_size; /* Name length */
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char *skc_name; /* Name string */
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spl_kmem_magazine_t *skc_mag[NR_CPUS]; /* Per-CPU warm cache */
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uint32_t skc_mag_size; /* Magazine size */
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uint32_t skc_mag_refill; /* Magazine refill count */
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spl_kmem_ctor_t skc_ctor; /* Constructor */
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spl_kmem_dtor_t skc_dtor; /* Destructor */
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spl_kmem_reclaim_t skc_reclaim; /* Reclaimator */
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void *skc_private; /* Private data */
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void *skc_vmp; /* Unused */
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unsigned long skc_flags; /* Flags */
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uint32_t skc_obj_size; /* Object size */
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uint32_t skc_obj_align; /* Object alignment */
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uint32_t skc_slab_objs; /* Objects per slab */
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uint32_t skc_slab_size; /* Slab size */
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uint32_t skc_delay; /* Slab reclaim interval */
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uint32_t skc_reap; /* Slab reclaim count */
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atomic_t skc_ref; /* Ref count callers */
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struct delayed_work skc_work; /* Slab reclaim work */
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struct list_head skc_list; /* List of caches linkage */
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struct list_head skc_complete_list;/* Completely alloc'ed */
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struct list_head skc_partial_list; /* Partially alloc'ed */
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spinlock_t skc_lock; /* Cache lock */
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uint64_t skc_slab_fail; /* Slab alloc failures */
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uint64_t skc_slab_create;/* Slab creates */
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uint64_t skc_slab_destroy;/* Slab destroys */
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uint64_t skc_slab_total; /* Slab total current */
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uint64_t skc_slab_alloc; /* Slab alloc current */
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uint64_t skc_slab_max; /* Slab max historic */
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uint64_t skc_obj_total; /* Obj total current */
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uint64_t skc_obj_alloc; /* Obj alloc current */
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uint64_t skc_obj_max; /* Obj max historic */
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} spl_kmem_cache_t;
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#define kmem_cache_t spl_kmem_cache_t
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extern spl_kmem_cache_t *
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spl_kmem_cache_create(char *name, size_t size, size_t align,
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spl_kmem_ctor_t ctor, spl_kmem_dtor_t dtor, spl_kmem_reclaim_t reclaim,
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void *priv, void *vmp, int flags);
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extern void spl_kmem_cache_destroy(spl_kmem_cache_t *skc);
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extern void *spl_kmem_cache_alloc(spl_kmem_cache_t *skc, int flags);
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extern void spl_kmem_cache_free(spl_kmem_cache_t *skc, void *obj);
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extern void spl_kmem_cache_reap_now(spl_kmem_cache_t *skc);
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extern void spl_kmem_reap(void);
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int spl_kmem_init_kallsyms_lookup(void);
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int spl_kmem_init(void);
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void spl_kmem_fini(void);
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#define kmem_cache_create(name,size,align,ctor,dtor,rclm,priv,vmp,flags) \
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spl_kmem_cache_create(name,size,align,ctor,dtor,rclm,priv,vmp,flags)
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#define kmem_cache_destroy(skc) spl_kmem_cache_destroy(skc)
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#define kmem_cache_alloc(skc, flags) spl_kmem_cache_alloc(skc, flags)
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#define kmem_cache_free(skc, obj) spl_kmem_cache_free(skc, obj)
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#define kmem_cache_reap_now(skc) spl_kmem_cache_reap_now(skc)
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#define kmem_reap() spl_kmem_reap()
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#define kmem_virt(ptr) (((ptr) >= (void *)VMALLOC_START) && \
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((ptr) < (void *)VMALLOC_END))
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SPL_KMEM_H */
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