wonderful-mobile/exynos-linux-stable
2
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

[SCSI] async: introduce 'async_domain' type

Browse source 
This is in preparation for teaching async_synchronize_full() to sync all
pending async work, and not just on the async_running domain.  This
conversion is functionally equivalent, just embedding the existing list
in a new async_domain type.

The .registered attribute is used in a later patch to distinguish
between domains that want to be flushed by async_synchronize_full()
versus those that only expect async_synchronize_{full|cookie}_domain to
be used for flushing.

[jejb: add async.h to scsi_priv.h for struct async_domain]
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Arjan van de Ven <arjan@linux.intel.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Tested-by: Eldad Zack <eldad@fogrefinery.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Dan Williams 2012-07-09 19:33:25 -07:00 • committed by James Bottomley
parent 529f9a7655
commit 2955b47d2c
7 changed files with 55 additions and 27 deletions
Download patch file Download diff file Expand all files Collapse all files

35
kernel/async.c
View file

@ -62,7 +62,7 @@ static async_cookie_t next_cookie = 1;
#define MAX_WORK 32768
static LIST_HEAD(async_pending);
static LIST_HEAD(async_running);
static ASYNC_DOMAIN(async_running);
static DEFINE_SPINLOCK(async_lock);
struct async_entry {
@ -71,7 +71,7 @@ struct async_entry {
async_cookie_t cookie;
async_func_ptr *func;
void *data;
struct list_head *running;
struct async_domain *running;
};
static DECLARE_WAIT_QUEUE_HEAD(async_done);
@ -82,13 +82,12 @@ static atomic_t entry_count;
/*
* MUST be called with the lock held!
*/
static async_cookie_t __lowest_in_progress(struct list_head *running)
static async_cookie_t __lowest_in_progress(struct async_domain *running)
{
struct async_entry *entry;
if (!list_empty(running)) {
entry = list_first_entry(running,
struct async_entry, list);
if (!list_empty(&running->domain)) {
entry = list_first_entry(&running->domain, typeof(*entry), list);
return entry->cookie;
}
@ -99,7 +98,7 @@ static async_cookie_t __lowest_in_progress(struct list_head *running)
return next_cookie; /* "infinity" value */
}
static async_cookie_t lowest_in_progress(struct list_head *running)
static async_cookie_t lowest_in_progress(struct async_domain *running)
{
unsigned long flags;
async_cookie_t ret;
@ -119,10 +118,11 @@ static void async_run_entry_fn(struct work_struct *work)
container_of(work, struct async_entry, work);
unsigned long flags;
ktime_t uninitialized_var(calltime), delta, rettime;
struct async_domain *running = entry->running;
/* 1) move self to the running queue */
spin_lock_irqsave(&async_lock, flags);
list_move_tail(&entry->list, entry->running);
list_move_tail(&entry->list, &running->domain);
spin_unlock_irqrestore(&async_lock, flags);
/* 2) run (and print duration) */
@ -156,7 +156,7 @@ static void async_run_entry_fn(struct work_struct *work)
wake_up(&async_done);
}
static async_cookie_t __async_schedule(async_func_ptr *ptr, void *data, struct list_head *running)
static async_cookie_t __async_schedule(async_func_ptr *ptr, void *data, struct async_domain *running)
{
struct async_entry *entry;
unsigned long flags;
@ -223,7 +223,7 @@ EXPORT_SYMBOL_GPL(async_schedule);
* Note: This function may be called from atomic or non-atomic contexts.
*/
async_cookie_t async_schedule_domain(async_func_ptr *ptr, void *data,
struct list_head *running)
struct async_domain *running)
{
return __async_schedule(ptr, data, running);
}
@ -238,20 +238,20 @@ void async_synchronize_full(void)
{
do {
async_synchronize_cookie(next_cookie);
} while (!list_empty(&async_running) || !list_empty(&async_pending));
} while (!list_empty(&async_running.domain) || !list_empty(&async_pending));
}
EXPORT_SYMBOL_GPL(async_synchronize_full);
/**
* async_synchronize_full_domain - synchronize all asynchronous function within a certain domain
* @list: running list to synchronize on
* @domain: running list to synchronize on
*
* This function waits until all asynchronous function calls for the
* synchronization domain specified by the running list @list have been done.
* synchronization domain specified by the running list @domain have been done.
*/
void async_synchronize_full_domain(struct list_head *list)
void async_synchronize_full_domain(struct async_domain *domain)
{
async_synchronize_cookie_domain(next_cookie, list);
async_synchronize_cookie_domain(next_cookie, domain);
}
EXPORT_SYMBOL_GPL(async_synchronize_full_domain);
@ -261,11 +261,10 @@ EXPORT_SYMBOL_GPL(async_synchronize_full_domain);
* @running: running list to synchronize on
*
* This function waits until all asynchronous function calls for the
* synchronization domain specified by the running list @list submitted
* synchronization domain specified by running list @running submitted
* prior to @cookie have been done.
*/
void async_synchronize_cookie_domain(async_cookie_t cookie,
struct list_head *running)
void async_synchronize_cookie_domain(async_cookie_t cookie, struct async_domain *running)
{
ktime_t uninitialized_var(starttime), delta, endtime;