[V3 PATCH 3/4] scsi:stex.c Add reboot support

[Charles Chiou]

From 72f5b5cbda424a254b0e9672bd4d9d249728fcb9 Mon Sep 17 00:00:00 2001
From: Charles Chiou <charles.chiou@xxxxxxxxxxxxxx>
Date: Wed, 5 Nov 2014 19:29:46 +0800
Subject: [PATCH 3/4] scsi:stex.c Add reboot support

1. Add reboot support, Pegasus devices should be notified that
   the host is going to shut down/reboot. I register reboot callback
   function to distinct host is going to shut down or to reboot.

2. Pegasus FW shutdown flow is sensitive to host behavior
   (host is going to S3/S4/shut down/reboot). To this end, I add one
   argument in stex_hba_stop to support various stop command.

Signed-off-by: charles.chiou@xxxxxxxxxxxxxx
---
 drivers/scsi/stex.c | 46 ++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 42 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/stex.c b/drivers/scsi/stex.c
index 7dc6afe..a536cfb 100644
--- a/drivers/scsi/stex.c
+++ b/drivers/scsi/stex.c
@@ -24,6 +24,7 @@
 #include <linux/interrupt.h>
 #include <linux/types.h>
 #include <linux/module.h>
+#include <linux/reboot.h>
 #include <linux/spinlock.h>
 #include <asm/io.h>
 #include <asm/irq.h>
@@ -166,6 +167,13 @@ enum {

 	ST_ADDITIONAL_MEM			= 0x200000,
 	ST_ADDITIONAL_MEM_MIN			= 0x80000,
+	PMIC_SHUTDOWN				= 0x0D,
+	PMIC_REUMSE					= 0x10,
+	ST_IGNORED					= -1,
+	ST_S3						= 3,
+	ST_S4						= 4,
+	ST_S5						= 5,
+	ST_S6						= 6,
 };

 struct st_sgitem {
@@ -344,6 +352,7 @@ struct st_card_info {
 	u16 sts_count;
 };

+static int reboot;
 static int msi;
 module_param(msi, int, 0);
 MODULE_PARM_DESC(msi, "Enable Message Signaled Interrupts(0=off, 1=on)");
@@ -364,6 +373,14 @@ MODULE_AUTHOR("Ed Lin");
 MODULE_DESCRIPTION("Promise Technology SuperTrak EX Controllers");
 MODULE_LICENSE("GPL");
 MODULE_VERSION(ST_DRIVER_VERSION);
+static int stex_reboot_callback(struct notifier_block *self,
+							  unsigned long val,
+							  void *data)
+{
+	if (val == SYS_RESTART)
+		reboot = 1;
+	return NOTIFY_OK;
+}

 static void stex_gettime(__le64 *time)
 {
@@ -1562,6 +1579,7 @@ static int stex_probe(struct pci_dev *pdev, const 
struct pci_device_id *id)
 	u32 sts_offset, cp_offset, scratch_offset;
 	int err;

+	reboot = 0;
 	err = pci_enable_device(pdev);
 	if (err)
 		return err;
@@ -1755,7 +1773,7 @@ out_disable:
 	return err;
 }

-static void stex_hba_stop(struct st_hba *hba)
+static void stex_hba_stop(struct st_hba *hba, int st_sleep_mic)
 {
 	struct req_msg *req;
 	struct st_msg_header *msg_h;
@@ -1771,11 +1789,18 @@ static void stex_hba_stop(struct st_hba *hba)
 	} else
 		memset(req, 0, hba->rq_size);

-	if (hba->cardtype == st_yosemite || hba->cardtype == st_yel) {
+	if ((hba->cardtype == st_yosemite || hba->cardtype == st_yel)
+		&& st_sleep_mic == ST_IGNORED) {
 		req->cdb[0] = MGT_CMD;
 		req->cdb[1] = MGT_CMD_SIGNATURE;
 		req->cdb[2] = CTLR_CONFIG_CMD;
 		req->cdb[3] = CTLR_SHUTDOWN;
+	} else if (hba->cardtype == st_yel && st_sleep_mic != ST_IGNORED) {
+		req->cdb[0] = MGT_CMD;
+		req->cdb[1] = MGT_CMD_SIGNATURE;
+		req->cdb[2] = CTLR_CONFIG_CMD;
+		req->cdb[3] = PMIC_SHUTDOWN;
+		req->cdb[4] = st_sleep_mic;
 	} else {
 		req->cdb[0] = CONTROLLER_CMD;
 		req->cdb[1] = CTLR_POWER_STATE_CHANGE;
@@ -1795,10 +1820,12 @@ static void stex_hba_stop(struct st_hba *hba)
 	while (hba->ccb[tag].req_type & PASSTHRU_REQ_TYPE) {
 		if (time_after(jiffies, before + ST_INTERNAL_TIMEOUT * HZ)) {
 			hba->ccb[tag].req_type = 0;
+			hba->mu_status = MU_STATE_STOP;
 			return;
 		}
 		msleep(1);
 	}
+	hba->mu_status = MU_STATE_STOP;
 }

 static void stex_hba_free(struct st_hba *hba)
@@ -1838,7 +1865,14 @@ static void stex_shutdown(struct pci_dev *pdev)
 {
 	struct st_hba *hba = pci_get_drvdata(pdev);

-	stex_hba_stop(hba);
+	if (hba->supports_pm == 0)
+		stex_hba_stop(hba, ST_IGNORED);
+	else {
+		if (reboot)
+			stex_hba_stop(hba, ST_S6);
+		else
+			stex_hba_stop(hba, ST_S5);
+	}
 }

 MODULE_DEVICE_TABLE(pci, stex_pci_tbl);
@@ -1851,18 +1885,22 @@ static struct pci_driver stex_pci_driver = {
 	.shutdown	= stex_shutdown,
 };

+static struct notifier_block stex_reboot_notifier = {
+	stex_reboot_callback, NULL, 0
+};
 static int __init stex_init(void)
 {
 	printk(KERN_INFO DRV_NAME
 		": Promise SuperTrak EX Driver version: %s\n",
 		 ST_DRIVER_VERSION);
-
+	register_reboot_notifier(&stex_reboot_notifier);
 	return pci_register_driver(&stex_pci_driver);
 }

 static void __exit stex_exit(void)
 {
 	pci_unregister_driver(&stex_pci_driver);
+	unregister_reboot_notifier(&stex_reboot_notifier);
 }

 module_init(stex_init);
--
1.9.1

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