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authorLinus Torvalds <torvalds@linux-foundation.org>2012-07-24 18:11:22 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-07-24 18:11:22 -0700
commitbdc0077af574800d24318b6945cf2344e8dbb050 (patch)
treeefbcb8f2d8c2f1e42130e983405e49f2b95246f7 /kernel
parent801b03653fc04de2cc5bc83c06de504d41345b63 (diff)
parente96eb23d82b4246cce4eeb14a7eedbbdcf37b3d4 (diff)
downloadlinux-bdc0077af574800d24318b6945cf2344e8dbb050.tar.bz2
Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Pull first round of SCSI updates from James Bottomley: "The most important feature of this patch set is the new async infrastructure that makes sure async_synchronize_full() synchronizes all domains and allows us to remove all the hacks (like having scsi_complete_async_scans() in the device base code) and means that the async infrastructure will "just work" in future. The rest is assorted driver updates (aacraid, bnx2fc, virto-scsi, megaraid, bfa, lpfc, qla2xxx, qla4xxx) plus a lot of infrastructure work in sas and FC. Signed-off-by: James Bottomley <JBottomley@Parallels.com>" * tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (97 commits) [SCSI] Revert "[SCSI] fix async probe regression" [SCSI] cleanup usages of scsi_complete_async_scans [SCSI] queue async scan work to an async_schedule domain [SCSI] async: make async_synchronize_full() flush all work regardless of domain [SCSI] async: introduce 'async_domain' type [SCSI] bfa: Fix to set correct return error codes and misc cleanup. [SCSI] aacraid: Series 7 Async. (performance) mode support [SCSI] aha152x: Allow use on 64bit systems [SCSI] virtio-scsi: Add vdrv->scan for post VIRTIO_CONFIG_S_DRIVER_OK LUN scanning [SCSI] bfa: squelch lockdep complaint with a spin_lock_init [SCSI] qla2xxx: remove unnecessary reads of PCI_CAP_ID_EXP [SCSI] qla4xxx: remove unnecessary read of PCI_CAP_ID_EXP [SCSI] ufs: fix incorrect return value about SUCCESS and FAILED [SCSI] ufs: reverse the ufshcd_is_device_present logic [SCSI] ufs: use module_pci_driver [SCSI] usb-storage: update usb devices for write cache quirk in quirk list. [SCSI] usb-storage: add support for write cache quirk [SCSI] set to WCE if usb cache quirk is present. [SCSI] virtio-scsi: hotplug support for virtio-scsi [SCSI] virtio-scsi: split scatterlist per target ...
Diffstat (limited to 'kernel')
-rw-r--r--kernel/async.c76
1 files changed, 57 insertions, 19 deletions
diff --git a/kernel/async.c b/kernel/async.c
index bd0c168a3bbe..9d3118384858 100644
--- a/kernel/async.c
+++ b/kernel/async.c
@@ -62,8 +62,10 @@ 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 LIST_HEAD(async_domains);
static DEFINE_SPINLOCK(async_lock);
+static DEFINE_MUTEX(async_register_mutex);
struct async_entry {
struct list_head list;
@@ -71,7 +73,7 @@ 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 +84,12 @@ 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 +100,7 @@ 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 +120,11 @@ 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) */
@@ -145,6 +147,8 @@ static void async_run_entry_fn(struct work_struct *work)
/* 3) remove self from the running queue */
spin_lock_irqsave(&async_lock, flags);
list_del(&entry->list);
+ if (running->registered && --running->count == 0)
+ list_del_init(&running->node);
/* 4) free the entry */
kfree(entry);
@@ -156,7 +160,7 @@ 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;
@@ -187,6 +191,8 @@ static async_cookie_t __async_schedule(async_func_ptr *ptr, void *data, struct l
spin_lock_irqsave(&async_lock, flags);
newcookie = entry->cookie = next_cookie++;
list_add_tail(&entry->list, &async_pending);
+ if (running->registered && running->count++ == 0)
+ list_add_tail(&running->node, &async_domains);
atomic_inc(&entry_count);
spin_unlock_irqrestore(&async_lock, flags);
@@ -223,7 +229,7 @@ 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);
}
@@ -236,22 +242,52 @@ EXPORT_SYMBOL_GPL(async_schedule_domain);
*/
void async_synchronize_full(void)
{
+ mutex_lock(&async_register_mutex);
do {
- async_synchronize_cookie(next_cookie);
- } while (!list_empty(&async_running) || !list_empty(&async_pending));
+ struct async_domain *domain = NULL;
+
+ spin_lock_irq(&async_lock);
+ if (!list_empty(&async_domains))
+ domain = list_first_entry(&async_domains, typeof(*domain), node);
+ spin_unlock_irq(&async_lock);
+
+ async_synchronize_cookie_domain(next_cookie, domain);
+ } while (!list_empty(&async_domains));
+ mutex_unlock(&async_register_mutex);
}
EXPORT_SYMBOL_GPL(async_synchronize_full);
/**
+ * async_unregister_domain - ensure no more anonymous waiters on this domain
+ * @domain: idle domain to flush out of any async_synchronize_full instances
+ *
+ * async_synchronize_{cookie|full}_domain() are not flushed since callers
+ * of these routines should know the lifetime of @domain
+ *
+ * Prefer ASYNC_DOMAIN_EXCLUSIVE() declarations over flushing
+ */
+void async_unregister_domain(struct async_domain *domain)
+{
+ mutex_lock(&async_register_mutex);
+ spin_lock_irq(&async_lock);
+ WARN_ON(!domain->registered || !list_empty(&domain->node) ||
+ !list_empty(&domain->domain));
+ domain->registered = 0;
+ spin_unlock_irq(&async_lock);
+ mutex_unlock(&async_register_mutex);
+}
+EXPORT_SYMBOL_GPL(async_unregister_domain);
+
+/**
* 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);
@@ -261,14 +297,16 @@ 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;
+ if (!running)
+ return;
+
if (initcall_debug && system_state == SYSTEM_BOOTING) {
printk(KERN_DEBUG "async_waiting @ %i\n", task_pid_nr(current));
starttime = ktime_get();