linux-kernel - [PATCH 2/9] rsxx: Individual workqueues for interruptible events.

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Message-ID: <20130430195029.GB22764@oc6784271780.ibm.com>
Date:	Tue, 30 Apr 2013 14:50:29 -0500
From:	"Philip J. Kelleher" <pjk1939@...ux.vnet.ibm.com>
To:	axboe@...nel.dk
Cc:	linux-kernel@...r.kernel.org, klebers@...ux.vnet.ibm.com,
	brking@...ux.vnet.ibm.com
Subject: [PATCH 2/9] 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. 

Signed-off-by: Philip J Kelleher <pjk1939@...ux.vnet.ibm.com>
-------------------------------------------------------------------------------


diff -uprN -X linux-block-vanilla/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	2013-04-29 13:31:54.757239722 -0500
+++ linux-block/drivers/block/rsxx/core.c	2013-04-29 13:51:27.804187435 -0500
@@ -340,12 +340,13 @@ 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++;
 		}
@@ -818,7 +819,11 @@ 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);
@@ -863,6 +868,12 @@ static int rsxx_pci_probe(struct pci_dev
 		goto failed_sysfs_setup;
 
 	/************* 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);
@@ -901,11 +912,17 @@ 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_sysfs_remove(card);
 	rsxx_dma_destroy(card);
 failed_sysfs_setup:
 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-vanilla/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	2013-03-26 09:56:33.514217079 -0500
+++ linux-block/drivers/block/rsxx/cregs.c	2013-04-29 13:56:22.483249235 -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-vanilla/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	2013-04-29 13:31:54.760245026 -0500
+++ linux-block/drivers/block/rsxx/rsxx_priv.h	2013-04-29 13:49:47.340185047 -0500
@@ -135,6 +135,7 @@ 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;
@@ -155,6 +156,7 @@ 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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