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Add single hash bucket lock interface

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Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
This commit is contained in:
Adam Rutkowski 2019-08-01 16:53:20 -04:00
parent 3a70d68d38
commit 2333d837fb
4 changed files with 59 additions and 3 deletions
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47
src/concurrency/ocf_metadata_concurrency.c
View File

@ -4,6 +4,7 @@
*/
#include "ocf_metadata_concurrency.h"
#include "../metadata/metadata_misc.h"
void ocf_metadata_concurrency_init(struct ocf_metadata_lock *metadata_lock)
{
@ -20,11 +21,12 @@ void ocf_metadata_concurrency_deinit(struct ocf_metadata_lock *metadata_lock)
}
int ocf_metadata_concurrency_attached_init(
struct ocf_metadata_lock *metadata_lock,
struct ocf_metadata_lock *metadata_lock, ocf_cache_t cache,
uint64_t hash_table_entries)
{
uint64_t i;
metadata_lock->cache = cache;
metadata_lock->num_hash_entries = hash_table_entries;
metadata_lock->hash = env_vzalloc(sizeof(env_rwsem) *
hash_table_entries);
@ -132,6 +134,49 @@ int ocf_metadata_hash_try_lock(struct ocf_metadata_lock *metadata_lock,
return 0;
}
/* NOTE: attempt to acquire hash lock for multiple core lines may end up
* in deadlock. In order to hash lock multiple core lines safely, use
* ocf_req_hash_lock_* functions */
void ocf_metadata_hash_lock_rd(struct ocf_metadata_lock *metadata_lock,
uint32_t core_id, uint64_t core_line)
{
ocf_cache_line_t hash = ocf_metadata_hash_func(metadata_lock->cache,
core_line, core_id);
ocf_metadata_start_shared_access(metadata_lock);
ocf_metadata_hash_lock(metadata_lock, hash, OCF_METADATA_RD);
}
void ocf_metadata_hash_unlock_rd(struct ocf_metadata_lock *metadata_lock,
uint32_t core_id, uint64_t core_line)
{
ocf_cache_line_t hash = ocf_metadata_hash_func(metadata_lock->cache,
core_line, core_id);
ocf_metadata_hash_unlock(metadata_lock, hash, OCF_METADATA_RD);
ocf_metadata_end_shared_access(metadata_lock);
}
void ocf_metadata_hash_lock_wr(struct ocf_metadata_lock *metadata_lock,
uint32_t core_id, uint64_t core_line)
{
ocf_cache_line_t hash = ocf_metadata_hash_func(metadata_lock->cache,
core_line, core_id);
ocf_metadata_start_shared_access(metadata_lock);
ocf_metadata_hash_lock(metadata_lock, hash, OCF_METADATA_WR);
}
void ocf_metadata_hash_unlock_wr(struct ocf_metadata_lock *metadata_lock,
uint32_t core_id, uint64_t core_line)
{
ocf_cache_line_t hash = ocf_metadata_hash_func(metadata_lock->cache,
core_line, core_id);
ocf_metadata_hash_unlock(metadata_lock, hash, OCF_METADATA_WR);
ocf_metadata_end_shared_access(metadata_lock);
}
#define _NUM_HASH_ENTRIES req->cache->metadata.lock.num_hash_entries
/*

12
src/concurrency/ocf_metadata_concurrency.h
View File

@ -15,7 +15,7 @@ void ocf_metadata_concurrency_init(struct ocf_metadata_lock *metadata_lock);
void ocf_metadata_concurrency_deinit(struct ocf_metadata_lock *metadata_lock);
int ocf_metadata_concurrency_attached_init(
struct ocf_metadata_lock *metadata_lock,
struct ocf_metadata_lock *metadata_lock, ocf_cache_t cache,
uint64_t hash_table_entries);
void ocf_metadata_concurrency_attached_deinit(
@ -113,6 +113,16 @@ static inline void ocf_metadata_status_bits_unlock(
ocf_metadata_status_bits_unlock(&cache->metadata.lock, \
OCF_METADATA_WR)
void ocf_metadata_hash_lock_rd(struct ocf_metadata_lock *metadata_lock,
uint32_t core_id, uint64_t core_line);
void ocf_metadata_hash_unlock_rd(struct ocf_metadata_lock *metadata_lock,
uint32_t core_id, uint64_t core_line);
void ocf_metadata_hash_lock_wr(struct ocf_metadata_lock *metadata_lock,
uint32_t core_id, uint64_t core_line);
void ocf_metadata_hash_unlock_wr(struct ocf_metadata_lock *metadata_lock,
uint32_t core_id, uint64_t core_line);
/* lock entire request in deadlock-free manner */
void ocf_req_hash_lock_rd(struct ocf_request *req);
void ocf_req_hash_unlock_rd(struct ocf_request *req);
void ocf_req_hash_lock_wr(struct ocf_request *req);

1
src/metadata/metadata_structs.h
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@ -435,6 +435,7 @@ struct ocf_metadata_lock
env_spinlock eviction; /*!< Fast lock for eviction policy */
env_rwsem *hash; /*!< Hash bucket locks */
uint32_t num_hash_entries; /*!< Hash bucket count */
ocf_cache_t cache; /*!< Parent cache object */
};
/**

2
src/mngt/ocf_mngt_cache.c
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@ -987,7 +987,7 @@ static void _ocf_mngt_attach_prepare_metadata(ocf_pipeline_t pipeline,
context->flags.attached_metadata_inited = true;
if (ocf_metadata_concurrency_attached_init(&cache->metadata.lock,
cache->device->hash_table_entries)) {
cache, cache->device->hash_table_entries)) {
ocf_cache_log(cache, log_err, "Failed to initialize attached "
"metadata concurrency\n");
OCF_PL_FINISH_RET(context->pipeline, -OCF_ERR_START_CACHE_FAIL);