[PATCH 05/16] hpsa: do a better job of detecting controller reset failure

["Stephen M. Cameron" <scameron@beardog.cce.hp.com>]

From: Stephen M. Cameron <scameron@beardog.cce.hp.com>

Detect failure of controller reset by noticing if the 32 bytes of
"driver version" we store on the hardware in the config table
fail to get zeroed out.  Previously we noticed if the controller
did not transition to "simple mode", but this did not detect reset
failure if the controller was already in simple mode prior to
the reset attempt (e.g. due to module parameter hpsa_simple_mode=1).

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
---
 drivers/scsi/hpsa.c     |   76 +++++++++++++++++++++++++++++++++++++++++------
 drivers/scsi/hpsa_cmd.h |    1 +
 2 files changed, 67 insertions(+), 10 deletions(-)

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 8266850..2aeb210 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -3184,6 +3184,59 @@ static int hpsa_controller_hard_reset(struct pci_dev *pdev,
 	return 0;
 }
 
+static __devinit void init_driver_version(char *driver_version, int len)
+{
+	memset(driver_version, 0, len);
+	strncpy(driver_version, "hpsa " HPSA_DRIVER_VERSION, len - 1);
+}
+
+static __devinit int write_driver_ver_to_cfgtable(
+	struct CfgTable __iomem *cfgtable)
+{
+	char *driver_version;
+	int i, size = sizeof(cfgtable->driver_version);
+
+	driver_version = kmalloc(size, GFP_KERNEL);
+	if (!driver_version)
+		return -ENOMEM;
+
+	init_driver_version(driver_version, size);
+	for (i = 0; i < size; i++)
+		writeb(driver_version[i], &cfgtable->driver_version[i]);
+	kfree(driver_version);
+	return 0;
+}
+
+static __devinit void read_driver_ver_from_cfgtable(
+	struct CfgTable __iomem *cfgtable, unsigned char *driver_ver)
+{
+	int i;
+
+	for (i = 0; i < sizeof(cfgtable->driver_version); i++)
+		driver_ver[i] = readb(&cfgtable->driver_version[i]);
+}
+
+static __devinit int controller_reset_failed(
+	struct CfgTable __iomem *cfgtable)
+{
+
+	char *driver_ver, *old_driver_ver;
+	int rc, size = sizeof(cfgtable->driver_version);
+
+	old_driver_ver = kmalloc(2 * size, GFP_KERNEL);
+	if (!old_driver_ver)
+		return -ENOMEM;
+	driver_ver = old_driver_ver + size;
+
+	/* After a reset, the 32 bytes of "driver version" in the cfgtable
+	 * should have been changed, otherwise we know the reset failed.
+	 */
+	init_driver_version(old_driver_ver, size);
+	read_driver_ver_from_cfgtable(cfgtable, driver_ver);
+	rc = !memcmp(driver_ver, old_driver_ver, size);
+	kfree(old_driver_ver);
+	return rc;
+}
 /* This does a hard reset of the controller using PCI power management
  * states or the using the doorbell register.
  */
@@ -3194,7 +3247,7 @@ static __devinit int hpsa_kdump_hard_reset_controller(struct pci_dev *pdev)
 	u64 cfg_base_addr_index;
 	void __iomem *vaddr;
 	unsigned long paddr;
-	u32 misc_fw_support, active_transport;
+	u32 misc_fw_support;
 	int rc;
 	struct CfgTable __iomem *cfgtable;
 	bool use_doorbell;
@@ -3256,6 +3309,9 @@ static __devinit int hpsa_kdump_hard_reset_controller(struct pci_dev *pdev)
 		rc = -ENOMEM;
 		goto unmap_vaddr;
 	}
+	rc = write_driver_ver_to_cfgtable(cfgtable);
+	if (rc)
+		goto unmap_vaddr;
 
 	/* If reset via doorbell register is supported, use that. */
 	misc_fw_support = readl(&cfgtable->misc_fw_support);
@@ -3289,19 +3345,16 @@ static __devinit int hpsa_kdump_hard_reset_controller(struct pci_dev *pdev)
 			"failed waiting for board to become ready\n");
 		goto unmap_cfgtable;
 	}
-	dev_info(&pdev->dev, "board ready.\n");
 
-	/* Controller should be in simple mode at this point.  If it's not,
-	 * It means we're on one of those controllers which doesn't support
-	 * the doorbell reset method and on which the PCI power management reset
-	 * method doesn't work (P800, for example.)
-	 * In those cases, don't try to proceed, as it generally doesn't work.
-	 */
-	active_transport = readl(&cfgtable->TransportActive);
-	if (active_transport & PERFORMANT_MODE) {
+	rc = controller_reset_failed(vaddr);
+	if (rc < 0)
+		goto unmap_cfgtable;
+	if (rc) {
 		dev_warn(&pdev->dev, "Unable to successfully reset controller,"
 			" Ignoring controller.\n");
 		rc = -ENODEV;
+	} else {
+		dev_info(&pdev->dev, "board ready.\n");
 	}
 
 unmap_cfgtable:
@@ -3542,6 +3595,9 @@ static int __devinit hpsa_find_cfgtables(struct ctlr_info *h)
 		       cfg_base_addr_index) + cfg_offset, sizeof(*h->cfgtable));
 	if (!h->cfgtable)
 		return -ENOMEM;
+	rc = write_driver_ver_to_cfgtable(h->cfgtable);
+	if (rc)
+		return rc;
 	/* Find performant mode table. */
 	trans_offset = readl(&h->cfgtable->TransMethodOffset);
 	h->transtable = remap_pci_mem(pci_resource_start(h->pdev,
diff --git a/drivers/scsi/hpsa_cmd.h b/drivers/scsi/hpsa_cmd.h
index 0500740..8fd35a7 100644
--- a/drivers/scsi/hpsa_cmd.h
+++ b/drivers/scsi/hpsa_cmd.h
@@ -337,6 +337,7 @@ struct CfgTable {
 	u8		reserved[0x78 - 0x58];
 	u32		misc_fw_support; /* offset 0x78 */
 #define			MISC_FW_DOORBELL_RESET (0x02)
+	u8		driver_version[32];
 };
 
 #define NUM_BLOCKFETCH_ENTRIES 8