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8464443f8d
git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@106 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c
377 lines
18 KiB
C
377 lines
18 KiB
C
#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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//#define DEBUG_KMEM
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#undef DEBUG_KMEM
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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.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 <sys/debug.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 (GFP_KERNEL | 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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#ifdef DEBUG_KMEM
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extern atomic64_t kmem_alloc_used;
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extern unsigned long kmem_alloc_max;
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extern atomic64_t vmem_alloc_used;
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extern unsigned long vmem_alloc_max;
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extern int kmem_warning_flag;
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extern atomic64_t kmem_cache_alloc_failed;
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/* XXX - Not to surprisingly with debugging enabled the xmem_locks are very
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* highly contended particularly on xfree(). If we want to run with this
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* detailed debugging enabled for anything other than debugging we need to
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* minimize the contention by moving to a lock per xmem_table entry model.
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*/
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#define KMEM_HASH_BITS 10
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#define KMEM_TABLE_SIZE (1 << KMEM_HASH_BITS)
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extern struct hlist_head kmem_table[KMEM_TABLE_SIZE];
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extern struct list_head kmem_list;
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extern spinlock_t kmem_lock;
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#define VMEM_HASH_BITS 10
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#define VMEM_TABLE_SIZE (1 << VMEM_HASH_BITS)
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extern struct hlist_head vmem_table[VMEM_TABLE_SIZE];
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extern struct list_head vmem_list;
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extern spinlock_t vmem_lock;
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typedef struct kmem_debug {
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struct hlist_node kd_hlist; /* Hash node linkage */
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struct list_head kd_list; /* List of all allocations */
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void *kd_addr; /* Allocation pointer */
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size_t kd_size; /* Allocation size */
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const char *kd_func; /* Allocation function */
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int kd_line; /* Allocation line */
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} kmem_debug_t;
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static __inline__ kmem_debug_t *
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__kmem_del_init(spinlock_t *lock,struct hlist_head *table,int bits,void *addr)
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{
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struct hlist_head *head;
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struct hlist_node *node;
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struct kmem_debug *p;
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unsigned long flags;
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spin_lock_irqsave(lock, flags);
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head = &table[hash_ptr(addr, bits)];
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hlist_for_each_entry_rcu(p, node, head, kd_hlist) {
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if (p->kd_addr == addr) {
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hlist_del_init(&p->kd_hlist);
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list_del_init(&p->kd_list);
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spin_unlock_irqrestore(lock, flags);
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return p;
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}
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}
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spin_unlock_irqrestore(lock, flags);
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return NULL;
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}
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#define __kmem_alloc(size, flags, allocator) \
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({ void *_ptr_ = NULL; \
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kmem_debug_t *_dptr_; \
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unsigned long _flags_; \
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\
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_dptr_ = (kmem_debug_t *)kmalloc(sizeof(kmem_debug_t), (flags)); \
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if (_dptr_ == NULL) { \
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__CDEBUG_LIMIT(S_KMEM, D_WARNING, "Warning " \
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"kmem_alloc(%d, 0x%x) debug failed\n", \
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sizeof(kmem_debug_t), (int)(flags)); \
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} else { \
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/* Marked unlikely because we should never be doing this, */ \
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/* we tolerate to up 2 pages but a single page is best. */ \
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if (unlikely((size) > (PAGE_SIZE * 2)) && kmem_warning_flag) \
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__CDEBUG_LIMIT(S_KMEM, D_WARNING, "Warning large " \
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"kmem_alloc(%d, 0x%x) (%ld/%ld)\n", \
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(int)(size), (int)(flags), \
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atomic64_read(&kmem_alloc_used), \
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kmem_alloc_max); \
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\
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_ptr_ = (void *)allocator((size), (flags)); \
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if (_ptr_ == NULL) { \
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kfree(_dptr_); \
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__CDEBUG_LIMIT(S_KMEM, D_WARNING, "Warning " \
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"kmem_alloc(%d, 0x%x) failed (%ld/" \
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"%ld)\n", (int)(size), (int)(flags), \
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atomic64_read(&kmem_alloc_used), \
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kmem_alloc_max); \
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} else { \
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atomic64_add((size), &kmem_alloc_used); \
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if (unlikely(atomic64_read(&kmem_alloc_used) > \
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kmem_alloc_max)) \
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kmem_alloc_max = \
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atomic64_read(&kmem_alloc_used); \
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\
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INIT_HLIST_NODE(&_dptr_->kd_hlist); \
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INIT_LIST_HEAD(&_dptr_->kd_list); \
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_dptr_->kd_addr = _ptr_; \
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_dptr_->kd_size = (size); \
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_dptr_->kd_func = __FUNCTION__; \
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_dptr_->kd_line = __LINE__; \
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spin_lock_irqsave(&kmem_lock, _flags_); \
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hlist_add_head_rcu(&_dptr_->kd_hlist, \
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&kmem_table[hash_ptr(_ptr_, KMEM_HASH_BITS)]);\
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list_add_tail(&_dptr_->kd_list, &kmem_list); \
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spin_unlock_irqrestore(&kmem_lock, _flags_); \
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\
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__CDEBUG_LIMIT(S_KMEM, D_INFO, "kmem_alloc(" \
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"%d, 0x%x) = %p (%ld/%ld)\n", \
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(int)(size), (int)(flags), _ptr_, \
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atomic64_read(&kmem_alloc_used), \
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kmem_alloc_max); \
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} \
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} \
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\
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_ptr_; \
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})
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#define kmem_alloc(size, flags) __kmem_alloc((size), (flags), kmalloc)
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#define kmem_zalloc(size, flags) __kmem_alloc((size), (flags), kzalloc)
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#define kmem_free(ptr, size) \
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({ \
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kmem_debug_t *_dptr_; \
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ASSERT((ptr) || (size > 0)); \
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\
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_dptr_ = __kmem_del_init(&kmem_lock, kmem_table, KMEM_HASH_BITS, ptr);\
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ASSERT(_dptr_); /* Must exist in hash due to kmem_alloc() */ \
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ASSERTF(_dptr_->kd_size == (size), "kd_size (%d) != size (%d), " \
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"kd_func = %s, kd_line = %d\n", _dptr_->kd_size, (size), \
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_dptr_->kd_func, _dptr_->kd_line); /* Size must match */ \
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atomic64_sub((size), &kmem_alloc_used); \
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__CDEBUG_LIMIT(S_KMEM, D_INFO, "kmem_free(%p, %d) (%ld/%ld)\n", \
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(ptr), (int)(size), atomic64_read(&kmem_alloc_used), \
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kmem_alloc_max); \
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\
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memset(_dptr_, 0x5a, sizeof(kmem_debug_t)); \
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kfree(_dptr_); \
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\
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memset(ptr, 0x5a, (size)); \
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kfree(ptr); \
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})
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#define __vmem_alloc(size, flags) \
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({ void *_ptr_ = NULL; \
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kmem_debug_t *_dptr_; \
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unsigned long _flags_; \
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\
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ASSERT((flags) & KM_SLEEP); \
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\
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_dptr_ = (kmem_debug_t *)kmalloc(sizeof(kmem_debug_t), (flags)); \
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if (_dptr_ == NULL) { \
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__CDEBUG_LIMIT(S_KMEM, D_WARNING, "Warning " \
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"vmem_alloc(%d, 0x%x) debug failed\n", \
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sizeof(kmem_debug_t), (int)(flags)); \
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} else { \
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_ptr_ = (void *)__vmalloc((size), (((flags) | \
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__GFP_HIGHMEM) & ~__GFP_ZERO), \
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PAGE_KERNEL); \
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if (_ptr_ == NULL) { \
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kfree(_dptr_); \
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__CDEBUG_LIMIT(S_KMEM, D_WARNING, "Warning " \
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"vmem_alloc(%d, 0x%x) failed (%ld/" \
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"%ld)\n", (int)(size), (int)(flags), \
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atomic64_read(&vmem_alloc_used), \
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vmem_alloc_max); \
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} else { \
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if (flags & __GFP_ZERO) \
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memset(_ptr_, 0, (size)); \
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\
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atomic64_add((size), &vmem_alloc_used); \
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if (unlikely(atomic64_read(&vmem_alloc_used) > \
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vmem_alloc_max)) \
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vmem_alloc_max = \
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atomic64_read(&vmem_alloc_used); \
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\
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INIT_HLIST_NODE(&_dptr_->kd_hlist); \
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INIT_LIST_HEAD(&_dptr_->kd_list); \
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_dptr_->kd_addr = _ptr_; \
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_dptr_->kd_size = (size); \
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_dptr_->kd_func = __FUNCTION__; \
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_dptr_->kd_line = __LINE__; \
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spin_lock_irqsave(&vmem_lock, _flags_); \
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hlist_add_head_rcu(&_dptr_->kd_hlist, \
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&vmem_table[hash_ptr(_ptr_, VMEM_HASH_BITS)]);\
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list_add_tail(&_dptr_->kd_list, &vmem_list); \
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spin_unlock_irqrestore(&vmem_lock, _flags_); \
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\
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__CDEBUG_LIMIT(S_KMEM, D_INFO, "vmem_alloc(" \
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"%d, 0x%x) = %p (%ld/%ld)\n", \
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(int)(size), (int)(flags), _ptr_, \
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atomic64_read(&vmem_alloc_used), \
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vmem_alloc_max); \
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} \
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} \
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\
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_ptr_; \
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})
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#define vmem_alloc(size, flags) __vmem_alloc((size), (flags))
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#define vmem_zalloc(size, flags) __vmem_alloc((size), ((flags) | \
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__GFP_ZERO))
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#define vmem_free(ptr, size) \
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({ \
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kmem_debug_t *_dptr_; \
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ASSERT((ptr) || (size > 0)); \
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\
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_dptr_ = __kmem_del_init(&vmem_lock, vmem_table, VMEM_HASH_BITS, ptr);\
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ASSERT(_dptr_); /* Must exist in hash due to vmem_alloc() */ \
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ASSERTF(_dptr_->kd_size == (size), "kd_size (%d) != size (%d), " \
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"kd_func = %s, kd_line = %d\n", _dptr_->kd_size, (size), \
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_dptr_->kd_func, _dptr_->kd_line); /* Size must match */ \
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atomic64_sub((size), &vmem_alloc_used); \
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__CDEBUG_LIMIT(S_KMEM, D_INFO, "vmem_free(%p, %d) (%ld/%ld)\n", \
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(ptr), (int)(size), atomic64_read(&vmem_alloc_used), \
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vmem_alloc_max); \
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\
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memset(_dptr_, 0x5a, sizeof(kmem_debug_t)); \
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kfree(_dptr_); \
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\
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memset(ptr, 0x5a, (size)); \
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vfree(ptr); \
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})
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#else /* DEBUG_KMEM */
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#define kmem_alloc(size, flags) kmalloc((size), (flags))
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#define kmem_zalloc(size, flags) kzalloc((size), (flags))
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#define kmem_free(ptr, size) kfree(ptr)
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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) 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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#undef KMC_NOTOUCH /* No linux analog */
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#define KMC_NODEBUG 0x00000000 /* Default behavior */
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#define KMC_NOMAGAZINE /* No linux analog */
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#define KMC_NOHASH /* No linux analog */
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#define KMC_QCACHE /* No linux analog */
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#define KMC_REAP_CHUNK 256
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#define KMC_DEFAULT_SEEKS DEFAULT_SEEKS
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/* Defined by linux slab.h
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* typedef struct kmem_cache_s kmem_cache_t;
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*/
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/* No linux analog
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* extern int kmem_ready;
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* extern pgcnt_t kmem_reapahead;
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*/
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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(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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typedef int (*kmem_constructor_t)(void *, void *, int);
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typedef void (*kmem_destructor_t)(void *, void *);
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typedef void (*kmem_reclaim_t)(void *);
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extern int kmem_set_warning(int flag);
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extern kmem_cache_t *
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__kmem_cache_create(char *name, size_t size, size_t align,
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kmem_constructor_t constructor,
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kmem_destructor_t destructor,
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kmem_reclaim_t reclaim,
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void *priv, void *vmp, int flags);
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extern int __kmem_cache_destroy(kmem_cache_t *cache);
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extern void *__kmem_cache_alloc(kmem_cache_t *cache, gfp_t flags);
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extern void __kmem_reap(void);
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int kmem_init(void);
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void kmem_fini(void);
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#define kmem_cache_create(name,size,align,ctor,dtor,rclm,priv,vmp,flags) \
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__kmem_cache_create(name,size,align,ctor,dtor,rclm,priv,vmp,flags)
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#define kmem_cache_destroy(cache) __kmem_cache_destroy(cache)
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#define kmem_cache_alloc(cache, flags) __kmem_cache_alloc(cache, flags)
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#define kmem_cache_free(cache, ptr) kmem_cache_free(cache, ptr)
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#define kmem_cache_reap_now(cache) kmem_cache_shrink(cache)
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#define kmem_reap() __kmem_reap()
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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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