[SCSI] hpsa: use new doorbell-bit-5 reset method

The bit-2-doorbell reset method seemed to cause (survivable) NMIs
on some systems and (unsurvivable) IOCK NMIs on some G7 servers.
Firmware guys implemented a new doorbell method to alleviate these
problems triggered by bit 5 of the doorbell register.  We want to
use it if it's available.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <jbottomley@parallels.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index ca92141b773686c14f4f3f75a1fbf00dde26f647..c096cda3a6f4851f34a7cff09330591b17aac034 100644 (file)
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -3128,7 +3128,7 @@ static __devinit int hpsa_message(struct pci_dev *pdev, unsigned char opcode,
 #define hpsa_noop(p) hpsa_message(p, 3, 0)
 
 static int hpsa_controller_hard_reset(struct pci_dev *pdev,
-       void * __iomem vaddr, bool use_doorbell)
+       void * __iomem vaddr, u32 use_doorbell)
 {
        u16 pmcsr;
        int pos;
@@ -3139,7 +3139,7 @@ static int hpsa_controller_hard_reset(struct pci_dev *pdev,
                 * other way using the doorbell register.
                 */
                dev_info(&pdev->dev, "using doorbell to reset controller\n");
-               writel(DOORBELL_CTLR_RESET, vaddr + SA5_DOORBELL);
+               writel(use_doorbell, vaddr + SA5_DOORBELL);
                msleep(1000);
        } else { /* Try to do it the PCI power state way */
 
@@ -3243,7 +3243,7 @@ static __devinit int hpsa_kdump_hard_reset_controller(struct pci_dev *pdev)
        u32 misc_fw_support;
        int rc;
        struct CfgTable __iomem *cfgtable;
-       bool use_doorbell;
+       u32 use_doorbell;
        u32 board_id;
        u16 command_register;
 
@@ -3306,9 +3306,24 @@ static __devinit int hpsa_kdump_hard_reset_controller(struct pci_dev *pdev)
        if (rc)
                goto unmap_vaddr;
 
-       /* If reset via doorbell register is supported, use that. */
+       /* If reset via doorbell register is supported, use that.
+        * There are two such methods.  Favor the newest method.
+        */
        misc_fw_support = readl(&cfgtable->misc_fw_support);
-       use_doorbell = misc_fw_support & MISC_FW_DOORBELL_RESET;
+       use_doorbell = misc_fw_support & MISC_FW_DOORBELL_RESET2;
+       if (use_doorbell) {
+               use_doorbell = DOORBELL_CTLR_RESET2;
+       } else {
+               use_doorbell = misc_fw_support & MISC_FW_DOORBELL_RESET;
+               if (use_doorbell) {
+                       dev_warn(&pdev->dev, "Controller claims that "
+                               "'Bit 2 doorbell reset' is "
+                               "supported, but not 'bit 5 doorbell reset'.  "
+                               "Firmware update is recommended.\n");
+                       rc = -ENODEV;
+                       goto unmap_cfgtable;
+               }
+       }
 
        rc = hpsa_controller_hard_reset(pdev, vaddr, use_doorbell);
        if (rc)

diff --git a/drivers/scsi/hpsa_cmd.h b/drivers/scsi/hpsa_cmd.h
index 8fd35a7abcd10536f7f72450eb34a0a305807e9f..55d741b019db22cf49b374f9c8a6994f7ccfcae7 100644 (file)
--- a/drivers/scsi/hpsa_cmd.h
+++ b/drivers/scsi/hpsa_cmd.h
@@ -101,6 +101,7 @@
 #define CFGTBL_ChangeReq        0x00000001l
 #define CFGTBL_AccCmds          0x00000001l
 #define DOORBELL_CTLR_RESET    0x00000004l
+#define DOORBELL_CTLR_RESET2   0x00000020l
 
 #define CFGTBL_Trans_Simple     0x00000002l
 #define CFGTBL_Trans_Performant 0x00000004l
@@ -337,6 +338,7 @@ struct CfgTable {
        u8              reserved[0x78 - 0x58];
        u32             misc_fw_support; /* offset 0x78 */
 #define                        MISC_FW_DOORBELL_RESET (0x02)
+#define                        MISC_FW_DOORBELL_RESET2 (0x010)
        u8              driver_version[32];
 };