[SCSI] async: introduce 'async_domain' type

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>

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 8b4b3829d9e719f1acb57ef0d5b158beeefe914d..6c74546fc3cdecfd5cb8222c6376e1549273beaf 100644 (file)
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -2744,7 +2744,7 @@ static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
 int regulator_bulk_enable(int num_consumers,
                          struct regulator_bulk_data *consumers)
 {
-       LIST_HEAD(async_domain);
+       ASYNC_DOMAIN_EXCLUSIVE(async_domain);
        int i;
        int ret = 0;
 

diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
index bec3bc8aab0cd2abe6b1c16286de204ce71b41bf..a59fcdc8fd6331e929c65f69afd2763819da33e0 100644 (file)
--- a/drivers/scsi/libsas/sas_ata.c
+++ b/drivers/scsi/libsas/sas_ata.c
@@ -742,7 +742,7 @@ static void async_sas_ata_eh(void *data, async_cookie_t cookie)
 void sas_ata_strategy_handler(struct Scsi_Host *shost)
 {
        struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
-       LIST_HEAD(async);
+       ASYNC_DOMAIN_EXCLUSIVE(async);
        int i;
 
        /* it's ok to defer revalidation events during ata eh, these

diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index bbbc9c918d4cc515f15d3b7edce9fa2359f3594a..4cade886a50a5962eb3dfe0f18ed885ced319ff5 100644 (file)
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -54,6 +54,7 @@
 #include <linux/notifier.h>
 #include <linux/cpu.h>
 #include <linux/mutex.h>
+#include <linux/async.h>
 
 #include <scsi/scsi.h>
 #include <scsi/scsi_cmnd.h>
@@ -91,7 +92,7 @@ EXPORT_SYMBOL(scsi_logging_level);
 #endif
 
 /* sd, scsi core and power management need to coordinate flushing async actions */
-LIST_HEAD(scsi_sd_probe_domain);
+ASYNC_DOMAIN(scsi_sd_probe_domain);
 EXPORT_SYMBOL(scsi_sd_probe_domain);
 
 /* NB: These are exposed through /proc/scsi/scsi and form part of the ABI.

diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h
index 13d74da5dfabe89ae44157e383f7fe1c07a3abc8..8f9a0cadc296fbe6c6c5ef6aa275267c626a8e7e 100644 (file)
--- a/drivers/scsi/scsi_priv.h
+++ b/drivers/scsi/scsi_priv.h
@@ -2,6 +2,7 @@
 #define _SCSI_PRIV_H
 
 #include <linux/device.h>
+#include <linux/async.h>
 #include <scsi/scsi_device.h>
 
 struct request_queue;
@@ -163,7 +164,7 @@ static inline int scsi_autopm_get_host(struct Scsi_Host *h) { return 0; }
 static inline void scsi_autopm_put_host(struct Scsi_Host *h) {}
 #endif /* CONFIG_PM_RUNTIME */
 
-extern struct list_head scsi_sd_probe_domain;
+extern struct async_domain scsi_sd_probe_domain;
 
 /* 
  * internal scsi timeout functions: for use by mid-layer and transport

diff --git a/include/linux/async.h b/include/linux/async.h
index 68a9530196f299c518856e6e4926376fcc4560cf..364e7ff16c087f546e9598a0a0ef0f53823a77a6 100644 (file)
--- a/include/linux/async.h
+++ b/include/linux/async.h
@@ -9,19 +9,46 @@
  * as published by the Free Software Foundation; version 2
  * of the License.
  */
+#ifndef __ASYNC_H__
+#define __ASYNC_H__
 
 #include <linux/types.h>
 #include <linux/list.h>
 
 typedef u64 async_cookie_t;
 typedef void (async_func_ptr) (void *data, async_cookie_t cookie);
+struct async_domain {
+       struct list_head node;
+       struct list_head domain;
+       int count;
+       unsigned registered:1;
+};
+
+/*
+ * domain participates in global async_synchronize_full
+ */
+#define ASYNC_DOMAIN(_name) \
+       struct async_domain _name = { .node = LIST_HEAD_INIT(_name.node), \
+                                     .domain = LIST_HEAD_INIT(_name.domain), \
+                                     .count = 0, \
+                                     .registered = 1 }
+
+/*
+ * domain is free to go out of scope as soon as all pending work is
+ * complete, this domain does not participate in async_synchronize_full
+ */
+#define ASYNC_DOMAIN_EXCLUSIVE(_name) \
+       struct async_domain _name = { .node = LIST_HEAD_INIT(_name.node), \
+                                     .domain = LIST_HEAD_INIT(_name.domain), \
+                                     .count = 0, \
+                                     .registered = 0 }
 
 extern async_cookie_t async_schedule(async_func_ptr *ptr, void *data);
 extern async_cookie_t async_schedule_domain(async_func_ptr *ptr, void *data,
-                                           struct list_head *list);
+                                           struct async_domain *domain);
 extern void async_synchronize_full(void);
-extern void async_synchronize_full_domain(struct list_head *list);
+extern void async_synchronize_full_domain(struct async_domain *domain);
 extern void async_synchronize_cookie(async_cookie_t cookie);
 extern void async_synchronize_cookie_domain(async_cookie_t cookie,
-                                           struct list_head *list);
-
+                                           struct async_domain *domain);
+#endif

diff --git a/kernel/async.c b/kernel/async.c
index bd0c168a3bbe5134e1bd4c009947c2011e551340..ba5491dfa9915a07ae62269e5cfe55c02c02c001 100644 (file)
--- a/kernel/async.c
+++ b/kernel/async.c
@@ -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;
 

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 89eae93445cf517e5e356297374fcbcf183529ae..fa1e31206892e3a4c7990ce1ba2984966e0ff3bb 100644 (file)
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -1545,7 +1545,7 @@ static int dapm_power_widgets(struct snd_soc_dapm_context *dapm, int event)
        struct snd_soc_dapm_context *d;
        LIST_HEAD(up_list);
        LIST_HEAD(down_list);
-       LIST_HEAD(async_domain);
+       ASYNC_DOMAIN_EXCLUSIVE(async_domain);
        enum snd_soc_bias_level bias;
 
        trace_snd_soc_dapm_start(card);