[SCSI] megaraid_{mm,mbox}: init fix for kdump

1.      Changes in Initialization to fix kdump failure.
        Send SYNC command on loading.
        This command clears the pending commands in the adapter
        and re-initialize its internal RAID structure.
        Without this change, megaraid driver either panics or fails to
        initialize the adapter during kdump's second kernel boot
        if there are pending commands or interrupts from other devices
        sharing the same IRQ.
2.      Authors email-id domain name changed from lsil.com to lsi.com.
        Also modified the MODULE_AUTHOR to megaraidlinux@lsi.com

Signed-off-by: Sumant Patro <sumant.patro@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 112 insertions, 28 deletions

diff --git a/drivers/scsi/megaraid/megaraid_mbox.c b/drivers/scsi/megaraid/megaraid_mbox.c
index 7bac86dda88f..49ee50cc4e84 100644
--- a/drivers/scsi/megaraid/megaraid_mbox.c
+++ b/drivers/scsi/megaraid/megaraid_mbox.c
@@ -10,13 +10,13 @@
  *	   2 of the License, or (at your option) any later version.
  *
  * FILE		: megaraid_mbox.c
- * Version	: v2.20.4.9 (Jul 16 2006)
+ * Version	: v2.20.5.1 (Nov 16 2006)
  *
  * Authors:
- * 	Atul Mukker		<Atul.Mukker@lsil.com>
- * 	Sreenivas Bagalkote	<Sreenivas.Bagalkote@lsil.com>
- * 	Manoj Jose		<Manoj.Jose@lsil.com>
- * 	Seokmann Ju		<Seokmann.Ju@lsil.com>
+ * 	Atul Mukker		<Atul.Mukker@lsi.com>
+ * 	Sreenivas Bagalkote	<Sreenivas.Bagalkote@lsi.com>
+ * 	Manoj Jose		<Manoj.Jose@lsi.com>
+ * 	Seokmann Ju
  *
  * List of supported controllers
  *
@@ -107,6 +107,7 @@ static int megaraid_mbox_support_random_del(adapter_t *);
 static int megaraid_mbox_get_max_sg(adapter_t *);
 static void megaraid_mbox_enum_raid_scsi(adapter_t *);
 static void megaraid_mbox_flush_cache(adapter_t *);
+static int megaraid_mbox_fire_sync_cmd(adapter_t *);
 
 static void megaraid_mbox_display_scb(adapter_t *, scb_t *);
 static void megaraid_mbox_setup_device_map(adapter_t *);
@@ -137,7 +138,7 @@ static int wait_till_fw_empty(adapter_t *);
 
 
 
-MODULE_AUTHOR("sju@lsil.com");
+MODULE_AUTHOR("megaraidlinux@lsi.com");
 MODULE_DESCRIPTION("LSI Logic MegaRAID Mailbox Driver");
 MODULE_LICENSE("GPL");
 MODULE_VERSION(MEGARAID_VERSION);
@@ -779,33 +780,39 @@ megaraid_init_mbox(adapter_t *adapter)
 		goto out_release_regions;
 	}
 
-	//
-	// Setup the rest of the soft state using the library of FW routines
-	//
+	/* initialize the mutual exclusion lock for the mailbox */
+	spin_lock_init(&raid_dev->mailbox_lock);
+
+	/* allocate memory required for commands */
+	if (megaraid_alloc_cmd_packets(adapter) != 0)
+		goto out_iounmap;
 
-	// request IRQ and register the interrupt service routine
+	/*
+	 * Issue SYNC cmd to flush the pending cmds in the adapter
+	 * and initialize its internal state
+	 */
+
+	if (megaraid_mbox_fire_sync_cmd(adapter))
+		con_log(CL_ANN, ("megaraid: sync cmd failed\n"));
+
+	/*
+	 * Setup the rest of the soft state using the library of
+	 * FW routines
+	 */
+
+	/* request IRQ and register the interrupt service routine */
 	if (request_irq(adapter->irq, megaraid_isr, IRQF_SHARED, "megaraid",
 		adapter)) {
 
 		con_log(CL_ANN, (KERN_WARNING
 			"megaraid: Couldn't register IRQ %d!\n", adapter->irq));
+		goto out_alloc_cmds;
 
-		goto out_iounmap;
-	}
-
-
-	// initialize the mutual exclusion lock for the mailbox
-	spin_lock_init(&raid_dev->mailbox_lock);
-
-	// allocate memory required for commands
-	if (megaraid_alloc_cmd_packets(adapter) != 0) {
-		goto out_free_irq;
 	}
 
 	// Product info
-	if (megaraid_mbox_product_info(adapter) != 0) {
-		goto out_alloc_cmds;
-	}
+	if (megaraid_mbox_product_info(adapter) != 0)
+		goto out_free_irq;
 
 	// Do we support extended CDBs
 	adapter->max_cdb_sz = 10;
@@ -874,9 +881,8 @@ megaraid_init_mbox(adapter_t *adapter)
 	 * Allocate resources required to issue FW calls, when sysfs is
 	 * accessed
 	 */
-	if (megaraid_sysfs_alloc_resources(adapter) != 0) {
-		goto out_alloc_cmds;
-	}
+	if (megaraid_sysfs_alloc_resources(adapter) != 0)
+		goto out_free_irq;
 
 	// Set the DMA mask to 64-bit. All supported controllers as capable of
 	// DMA in this range
@@ -920,10 +926,10 @@ megaraid_init_mbox(adapter_t *adapter)
 
 out_free_sysfs_res:
 	megaraid_sysfs_free_resources(adapter);
-out_alloc_cmds:
-	megaraid_free_cmd_packets(adapter);
 out_free_irq:
 	free_irq(adapter->irq, adapter);
+out_alloc_cmds:
+	megaraid_free_cmd_packets(adapter);
 out_iounmap:
 	iounmap(raid_dev->baseaddr);
 out_release_regions:
@@ -3380,6 +3386,84 @@ megaraid_mbox_flush_cache(adapter_t *adapter)
 
 
 /**
+ * megaraid_mbox_fire_sync_cmd - fire the sync cmd
+ * @param adapter	: soft state for the controller
+ *
+ * Clears the pending cmds in FW and reinits its RAID structs
+ */
+static int
+megaraid_mbox_fire_sync_cmd(adapter_t *adapter)
+{
+	mbox_t	*mbox;
+	uint8_t	raw_mbox[sizeof(mbox_t)];
+	mraid_device_t	*raid_dev = ADAP2RAIDDEV(adapter);
+	mbox64_t *mbox64;
+	int	status = 0;
+	int i;
+	uint32_t dword;
+
+	mbox = (mbox_t *)raw_mbox;
+
+	memset((caddr_t)raw_mbox, 0, sizeof(mbox_t));
+
+	raw_mbox[0] = 0xFF;
+
+	mbox64	= raid_dev->mbox64;
+	mbox	= raid_dev->mbox;
+
+	/* Wait until mailbox is free */
+	if (megaraid_busywait_mbox(raid_dev) != 0) {
+		status = 1;
+		goto blocked_mailbox;
+	}
+
+	/* Copy mailbox data into host structure */
+	memcpy((caddr_t)mbox, (caddr_t)raw_mbox, 16);
+	mbox->cmdid		= 0xFE;
+	mbox->busy		= 1;
+	mbox->poll		= 0;
+	mbox->ack		= 0;
+	mbox->numstatus		= 0;
+	mbox->status		= 0;
+
+	wmb();
+	WRINDOOR(raid_dev, raid_dev->mbox_dma | 0x1);
+
+	/* Wait for maximum 1 min for status to post.
+	 * If the Firmware SUPPORTS the ABOVE COMMAND,
+	 * mbox->cmd will be set to 0
+	 * else
+	 * the firmware will reject the command with
+	 * mbox->numstatus set to 1
+	 */
+
+	i = 0;
+	status = 0;
+	while (!mbox->numstatus && mbox->cmd == 0xFF) {
+		rmb();
+		msleep(1);
+		i++;
+		if (i > 1000 * 60) {
+			status = 1;
+			break;
+		}
+	}
+	if (mbox->numstatus == 1)
+		status = 1; /*cmd not supported*/
+
+	/* Check for interrupt line */
+	dword = RDOUTDOOR(raid_dev);
+	WROUTDOOR(raid_dev, dword);
+	WRINDOOR(raid_dev,2);
+
+	return status;
+
+blocked_mailbox:
+	con_log(CL_ANN, (KERN_WARNING "megaraid: blocked mailbox\n"));
+	return status;
+}
+
+/**
  * megaraid_mbox_display_scb - display SCB information, mostly debug purposes
  * @param adapter	: controllers' soft state
  * @param scb		: SCB to be displayed