linux-kernel - [PATCH 6/7] scsi: megaraid_sas - Add three times Online controller reset

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Date:	Tue, 25 May 2010 18:17:24 +0200
From:	Tomas Henzl <thenzl@...hat.com>
To:	"Yang, Bo" <Bo.Yang@....com>
CC:	"'James.Bottomley@...senPartnership.com'" 
	<James.Bottomley@...senPartnership.com>,
	"'James.Bottomley@...e.de'" <James.Bottomley@...e.de>,
	"'linux-scsi@...r.kernel.org'" <linux-scsi@...r.kernel.org>,
	"'akpm@...l.org'" <akpm@...l.org>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	"Daftardar, Jayant" <Jayant.Daftardar@....com>
Subject: [PATCH 6/7] scsi: megaraid_sas - Add three times Online controller
 reset - V2

V2: I've cleaned up some coding style issues and removed a variable, the functionality shouldn't be changed

Tomas

If fw didn't raise the interrupt with the fw state change to driver and fw goes to failure state, driver
Will check the FW state in driver's timeout routine and issue the reset if need.  Driver will do the OCR upto three
Times until kill adapter.  Also driver will issue OCR before driver kill adapter even if fw in operational state.   

Signed-off-by Bo Yang<bo.yang@....com>
Signed-off-by Tomas Henzl<thenzl@...hat.com>

---
diff --git a/drivers/scsi/megaraid/megaraid_sas.c b/drivers/scsi/megaraid/megaraid_sas.c
index 92e381b..0b84b3a 100644
--- a/drivers/scsi/megaraid/megaraid_sas.c
+++ b/drivers/scsi/megaraid/megaraid_sas.c
@@ -1551,6 +1551,28 @@ static void megasas_complete_cmd_dpc(unsigned long instance_addr)
 	}
 }
 
+static void
+megasas_internal_reset_defer_cmds(struct megasas_instance *instance);
+
+static void
+process_fw_state_change_wq(struct work_struct *work);
+
+void megasas_do_ocr(struct megasas_instance *instance)
+{
+	if (instance->pdev->device == PCI_DEVICE_ID_LSI_SAS1064R ||
+	    instance->pdev->device == PCI_DEVICE_ID_DELL_PERC5 ||
+	    instance->pdev->device == PCI_DEVICE_ID_LSI_VERDE_ZCR)
+		*instance->consumer = MEGASAS_ADPRESET_INPROG_SIGN;
+
+	instance->instancet->disable_intr(instance->reg_set);
+	instance->adprecovery = MEGASAS_ADPRESET_SM_INFAULT;
+	instance->issuepend_done = 0;
+
+	atomic_set(&instance->fw_outstanding, 0);
+	megasas_internal_reset_defer_cmds(instance);
+	process_fw_state_change_wq(&instance->work_init);
+}
+
 /**
  * megasas_wait_for_outstanding -	Wait for all outstanding cmds
  * @instance:				Adapter soft state
@@ -1568,6 +1590,9 @@ static int megasas_wait_for_outstanding(struct megasas_instance *instance)
 	unsigned long flags;
 	struct list_head clist_local;
 	struct megasas_cmd *reset_cmd;
+	u32 fw_state;
+	u8 kill_adapter_flag;
+	int outstanding;
 
 	spin_lock_irqsave(&instance->hba_lock, flags);
 	adprecovery = instance->adprecovery;
@@ -1628,7 +1653,7 @@ static int megasas_wait_for_outstanding(struct megasas_instance *instance)
 	printk(KERN_NOTICE "megaraid_sas: HBA reset handler invoked without an internal reset condition.\n");
 	for (i = 0; i < wait_time; i++) {
 
-		int outstanding = atomic_read(&instance->fw_outstanding);
+		outstanding = atomic_read(&instance->fw_outstanding);
 
 		if (!outstanding)
 			break;
@@ -1646,7 +1671,41 @@ static int megasas_wait_for_outstanding(struct megasas_instance *instance)
 		msleep(1000);
 	}
 
-	if (atomic_read(&instance->fw_outstanding)) {
+	i = 0;
+	kill_adapter_flag = 0;
+	do {
+		fw_state = instance->instancet->read_fw_status_reg(
+					instance->reg_set) & MFI_STATE_MASK;
+		if (fw_state == MFI_STATE_FAULT &&
+		    instance->disableOnlineCtrlReset == 0) {
+			if (i == 3) {
+				kill_adapter_flag = 2;
+				break;
+			}
+			megasas_do_ocr(instance);
+			kill_adapter_flag = 1;
+
+			/* wait for 1 secs to let FW finish the pending cmds */
+			msleep(1000);
+		}
+		i++;
+	} while (i <= 3);
+
+	if (atomic_read(&instance->fw_outstanding) && !kill_adapter_flag &&
+	    instance->disableOnlineCtrlReset == 0) {
+
+		megasas_do_ocr(instance);
+
+		/* wait for 5 secs to let FW finish the pending cmds */
+		for (i = 0; i < wait_time; i++) {
+			outstanding = atomic_read(&instance->fw_outstanding);
+			if (!outstanding)
+				return SUCCESS;
+			msleep(1000);
+		}
+	}
+
+	if (atomic_read(&instance->fw_outstanding) || kill_adapter_flag == 2) {
 		printk(KERN_NOTICE "megaraid_sas: pending cmds after reset\n");
 		/*
 		* Send signal to FW to stop processing any pending cmds.


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