[PATCH 2/2] Add S6 support

Charles Chiou
2017-02-17T02:52:47Z

From: Charles <charles.chiou@tw.promise.com>

1.Add reboot notifier and register it in stex_probe for all supported device.
2.For all supported device in restart flow, we get a callback from notifier and set S6flag for stex_shutdown & stex_hba_stop to send restart command to FW.

Signed-off-by: Charles.Chiou <charles.chiou@tw.promise.com>
Signed-off-by: Paul.Lyu <paul.lyu@tw.promise.com>
---
drivers/scsi/stex.c | 25 +++++++++++++++++++++++--
1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/stex.c b/drivers/scsi/stex.c
index e177dfe..0751561 100644
--- a/drivers/scsi/stex.c
+++ b/drivers/scsi/stex.c
@@ -26,6 +26,7 @@
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/ktime.h>
+#include <linux/reboot.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/byteorder.h>
@@ -362,6 +363,12 @@ struct st_card_info {
u16 sts_count;
};

+int S6flag;
+static int stex_halt(struct notifier_block *nb, ulong event, void *buf);
+static struct notifier_block stex_notifier = {
+ stex_halt, NULL, 0
+};
+
static int msi;
module_param(msi, int, 0);
MODULE_PARM_DESC(msi, "Enable Message Signaled Interrupts(0=off, 1=on)");
@@ -1673,6 +1680,9 @@ static int stex_probe(struct pci_dev *pdev, const struct pci_device_id *id)

pci_set_master(pdev);

+ S6flag = 0;
+ register_reboot_notifier(&stex_notifier);
+
host = scsi_host_alloc(&driver_template, sizeof(struct st_hba));

if (!host) {
@@ -1947,15 +1957,20 @@ static void stex_remove(struct pci_dev *pdev)
scsi_host_put(hba->host);

pci_disable_device(pdev);
+
+ unregister_reboot_notifier(&stex_notifier);
}

static void stex_shutdown(struct pci_dev *pdev)
{
struct st_hba *hba = pci_get_drvdata(pdev);

- if (hba->supports_pm == 0)
+ if (hba->supports_pm == 0) {
stex_hba_stop(hba, ST_IGNORED);
- else
+ } else if (hba->supports_pm == 1 && S6flag) {
+ unregister_reboot_notifier(&stex_notifier);
+ stex_hba_stop(hba, ST_S6);
+ } else
stex_hba_stop(hba, ST_S5);
}

@@ -1992,6 +2007,12 @@ static int stex_resume(struct pci_dev *pdev)
stex_handshake(hba);
return 0;
}
+
+static int stex_halt(struct notifier_block *nb, unsigned long event, void *buf)
+{
+ S6flag = 1;
+ return NOTIFY_OK;
+}
MODULE_DEVICE_TABLE(pci, stex_pci_tbl);

static struct pci_driver stex_pci_driver = {
--
1.9.1