cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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dm-cache-policy-internal.h (4464B)

      1/*
      2 * Copyright (C) 2012 Red Hat. All rights reserved.
      3 *
      4 * This file is released under the GPL.
      5 */
      6
      7#ifndef DM_CACHE_POLICY_INTERNAL_H
      8#define DM_CACHE_POLICY_INTERNAL_H
      9
     10#include <linux/vmalloc.h>
     11#include "dm-cache-policy.h"
     12
     13/*----------------------------------------------------------------*/
     14
     15static inline int policy_lookup(struct dm_cache_policy *p, dm_oblock_t oblock, dm_cblock_t *cblock,
     16				int data_dir, bool fast_copy, bool *background_queued)
     17{
     18	return p->lookup(p, oblock, cblock, data_dir, fast_copy, background_queued);
     19}
     20
     21static inline int policy_lookup_with_work(struct dm_cache_policy *p,
     22					  dm_oblock_t oblock, dm_cblock_t *cblock,
     23					  int data_dir, bool fast_copy,
     24					  struct policy_work **work)
     25{
     26	if (!p->lookup_with_work) {
     27		*work = NULL;
     28		return p->lookup(p, oblock, cblock, data_dir, fast_copy, NULL);
     29	}
     30
     31	return p->lookup_with_work(p, oblock, cblock, data_dir, fast_copy, work);
     32}
     33
     34static inline int policy_get_background_work(struct dm_cache_policy *p,
     35					     bool idle, struct policy_work **result)
     36{
     37	return p->get_background_work(p, idle, result);
     38}
     39
     40static inline void policy_complete_background_work(struct dm_cache_policy *p,
     41						   struct policy_work *work,
     42						   bool success)
     43{
     44	return p->complete_background_work(p, work, success);
     45}
     46
     47static inline void policy_set_dirty(struct dm_cache_policy *p, dm_cblock_t cblock)
     48{
     49	p->set_dirty(p, cblock);
     50}
     51
     52static inline void policy_clear_dirty(struct dm_cache_policy *p, dm_cblock_t cblock)
     53{
     54	p->clear_dirty(p, cblock);
     55}
     56
     57static inline int policy_load_mapping(struct dm_cache_policy *p,
     58				      dm_oblock_t oblock, dm_cblock_t cblock,
     59				      bool dirty, uint32_t hint, bool hint_valid)
     60{
     61	return p->load_mapping(p, oblock, cblock, dirty, hint, hint_valid);
     62}
     63
     64static inline int policy_invalidate_mapping(struct dm_cache_policy *p,
     65					    dm_cblock_t cblock)
     66{
     67	return p->invalidate_mapping(p, cblock);
     68}
     69
     70static inline uint32_t policy_get_hint(struct dm_cache_policy *p,
     71				       dm_cblock_t cblock)
     72{
     73	return p->get_hint ? p->get_hint(p, cblock) : 0;
     74}
     75
     76static inline dm_cblock_t policy_residency(struct dm_cache_policy *p)
     77{
     78	return p->residency(p);
     79}
     80
     81static inline void policy_tick(struct dm_cache_policy *p, bool can_block)
     82{
     83	if (p->tick)
     84		return p->tick(p, can_block);
     85}
     86
     87static inline int policy_emit_config_values(struct dm_cache_policy *p, char *result,
     88					    unsigned maxlen, ssize_t *sz_ptr)
     89{
     90	ssize_t sz = *sz_ptr;
     91	if (p->emit_config_values)
     92		return p->emit_config_values(p, result, maxlen, sz_ptr);
     93
     94	DMEMIT("0 ");
     95	*sz_ptr = sz;
     96	return 0;
     97}
     98
     99static inline int policy_set_config_value(struct dm_cache_policy *p,
    100					  const char *key, const char *value)
    101{
    102	return p->set_config_value ? p->set_config_value(p, key, value) : -EINVAL;
    103}
    104
    105static inline void policy_allow_migrations(struct dm_cache_policy *p, bool allow)
    106{
    107	return p->allow_migrations(p, allow);
    108}
    109
    110/*----------------------------------------------------------------*/
    111
    112/*
    113 * Some utility functions commonly used by policies and the core target.
    114 */
    115static inline size_t bitset_size_in_bytes(unsigned nr_entries)
    116{
    117	return sizeof(unsigned long) * dm_div_up(nr_entries, BITS_PER_LONG);
    118}
    119
    120static inline unsigned long *alloc_bitset(unsigned nr_entries)
    121{
    122	size_t s = bitset_size_in_bytes(nr_entries);
    123	return vzalloc(s);
    124}
    125
    126static inline void clear_bitset(void *bitset, unsigned nr_entries)
    127{
    128	size_t s = bitset_size_in_bytes(nr_entries);
    129	memset(bitset, 0, s);
    130}
    131
    132static inline void free_bitset(unsigned long *bits)
    133{
    134	vfree(bits);
    135}
    136
    137/*----------------------------------------------------------------*/
    138
    139/*
    140 * Creates a new cache policy given a policy name, a cache size, an origin size and the block size.
    141 */
    142struct dm_cache_policy *dm_cache_policy_create(const char *name, dm_cblock_t cache_size,
    143					       sector_t origin_size, sector_t block_size);
    144
    145/*
    146 * Destroys the policy.  This drops references to the policy module as well
    147 * as calling it's destroy method.  So always use this rather than calling
    148 * the policy->destroy method directly.
    149 */
    150void dm_cache_policy_destroy(struct dm_cache_policy *p);
    151
    152/*
    153 * In case we've forgotten.
    154 */
    155const char *dm_cache_policy_get_name(struct dm_cache_policy *p);
    156
    157const unsigned *dm_cache_policy_get_version(struct dm_cache_policy *p);
    158
    159size_t dm_cache_policy_get_hint_size(struct dm_cache_policy *p);
    160
    161/*----------------------------------------------------------------*/
    162
    163#endif /* DM_CACHE_POLICY_INTERNAL_H */