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Message-ID: <20130618193454.GB6492@oc6784271780.ibm.com>
Date: Tue, 18 Jun 2013 14:34:54 -0500
From: "Philip J. Kelleher" <pjk1939@...ux.vnet.ibm.com>
To: axboe@...nel.dk
Cc: linux-kernel@...r.kernel.org, brking@...ux.vnet.ibm.com
Subject: [PATCH 1/11] rsxx: Individual workqueues for interruptible events.
From: Philip J Kelleher <pjk1939@...ux.vnet.ibm.com>
Giving all interrupt based events their own workqueue to complete
tasks on. This fixes a bug that would cause creg commands to timeout
if too many are issued at once.
Signed-off-by: Philip J Kelleher <pjk1939@...ux.vnet.ibm.com>
-------------------------------------------------------------------------------
diff -uprN -X linux-block/Documentation/dontdiff linux-block-vanilla/drivers/block/rsxx/core.c linux-block/drivers/block/rsxx/core.c
--- linux-block-vanilla/drivers/block/rsxx/core.c 2013-05-31 14:57:49.404326499 -0500
+++ linux-block/drivers/block/rsxx/core.c 2013-05-31 15:05:02.770182971 -0500
@@ -163,12 +163,13 @@ static irqreturn_t rsxx_isr(int irq, voi
}
if (isr & CR_INTR_CREG) {
- schedule_work(&card->creg_ctrl.done_work);
+ queue_work(card->creg_ctrl.creg_wq,
+ &card->creg_ctrl.done_work);
handled++;
}
if (isr & CR_INTR_EVENT) {
- schedule_work(&card->event_work);
+ queue_work(card->event_wq, &card->event_work);
rsxx_disable_ier_and_isr(card, CR_INTR_EVENT);
handled++;
}
@@ -610,7 +611,11 @@ static int rsxx_pci_probe(struct pci_dev
}
/************* Setup Processor Command Interface *************/
- rsxx_creg_setup(card);
+ st = rsxx_creg_setup(card);
+ if (st) {
+ dev_err(CARD_TO_DEV(card), "Failed to setup creg interface.\n");
+ goto failed_creg_setup;
+ }
spin_lock_irq(&card->irq_lock);
rsxx_enable_ier_and_isr(card, CR_INTR_CREG);
@@ -650,6 +655,12 @@ static int rsxx_pci_probe(struct pci_dev
}
/************* Setup Card Event Handler *************/
+ card->event_wq = create_singlethread_workqueue(DRIVER_NAME"_event");
+ if (!card->event_wq) {
+ dev_err(CARD_TO_DEV(card), "Failed card event setup.\n");
+ goto failed_event_handler;
+ }
+
INIT_WORK(&card->event_work, card_event_handler);
st = rsxx_setup_dev(card);
@@ -688,9 +699,15 @@ static int rsxx_pci_probe(struct pci_dev
return 0;
failed_create_dev:
+ destroy_workqueue(card->event_wq);
+ card->event_wq = NULL;
+failed_event_handler:
rsxx_dma_destroy(card);
failed_dma_setup:
failed_compatiblity_check:
+ destroy_workqueue(card->creg_ctrl.creg_wq);
+ card->creg_ctrl.creg_wq = NULL;
+failed_creg_setup:
spin_lock_irq(&card->irq_lock);
rsxx_disable_ier_and_isr(card, CR_INTR_ALL);
spin_unlock_irq(&card->irq_lock);
diff -uprN -X linux-block/Documentation/dontdiff linux-block-vanilla/drivers/block/rsxx/cregs.c linux-block/drivers/block/rsxx/cregs.c
--- linux-block-vanilla/drivers/block/rsxx/cregs.c 2013-05-31 14:57:49.407047063 -0500
+++ linux-block/drivers/block/rsxx/cregs.c 2013-05-31 15:05:44.355016386 -0500
@@ -727,6 +727,11 @@ int rsxx_creg_setup(struct rsxx_cardinfo
{
card->creg_ctrl.active_cmd = NULL;
+ card->creg_ctrl.creg_wq =
+ create_singlethread_workqueue(DRIVER_NAME"_creg");
+ if (!card->creg_ctrl.creg_wq)
+ return -ENOMEM;
+
INIT_WORK(&card->creg_ctrl.done_work, creg_cmd_done);
mutex_init(&card->creg_ctrl.reset_lock);
INIT_LIST_HEAD(&card->creg_ctrl.queue);
diff -uprN -X linux-block/Documentation/dontdiff linux-block-vanilla/drivers/block/rsxx/rsxx_priv.h linux-block/drivers/block/rsxx/rsxx_priv.h
--- linux-block-vanilla/drivers/block/rsxx/rsxx_priv.h 2013-05-31 14:57:49.411326932 -0500
+++ linux-block/drivers/block/rsxx/rsxx_priv.h 2013-05-31 15:06:51.577016400 -0500
@@ -134,6 +134,7 @@ struct rsxx_cardinfo {
spinlock_t lock;
bool active;
struct creg_cmd *active_cmd;
+ struct workqueue_struct *creg_wq;
struct work_struct done_work;
struct list_head queue;
unsigned int q_depth;
@@ -154,6 +155,7 @@ struct rsxx_cardinfo {
int buf_len;
} log;
+ struct workqueue_struct *event_wq;
struct work_struct event_work;
unsigned int state;
u64 size8;
--
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