[SCSI] qla2xxx: Read capture firmware dump on mailbox timeout for ISP8044 and ISP82XX.

Allow for the capture of a firmware dump but have a sysfs node
(allow_cna_fw_dump) to allow the feature to be enabled/disabled dynamically.

The default is off.

Signed-off-by: Chad Dupuis <chad.dupuis@qlogic.com>
Signed-off-by: Saurav Kashyap <saurav.kashyap@qlogic.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 35 insertions, 0 deletions

diff --git a/drivers/scsi/qla2xxx/qla_attr.c b/drivers/scsi/qla2xxx/qla_attr.c
index f2d42b961e92..aa81829aeb3a 100644
--- a/drivers/scsi/qla2xxx/qla_attr.c
+++ b/drivers/scsi/qla2xxx/qla_attr.c
@@ -1503,6 +1503,37 @@ qla2x00_fw_dump_size_show(struct device *dev, struct device_attribute *attr,
         return scnprintf(buf, PAGE_SIZE, "%d\n", size);
 }
 
+static ssize_t
+qla2x00_allow_cna_fw_dump_show(struct device *dev,
+        struct device_attribute *attr, char *buf)
+{
+        scsi_qla_host_t *vha = shost_priv(class_to_shost(dev));
+
+        if (!IS_P3P_TYPE(vha->hw))
+                return scnprintf(buf, PAGE_SIZE, "\n");
+        else
+                return scnprintf(buf, PAGE_SIZE, "%s\n",
+                    vha->hw->allow_cna_fw_dump ? "true" : "false");
+}
+
+static ssize_t
+qla2x00_allow_cna_fw_dump_store(struct device *dev,
+        struct device_attribute *attr, const char *buf, size_t count)
+{
+        scsi_qla_host_t *vha = shost_priv(class_to_shost(dev));
+        int val = 0;
+
+        if (!IS_P3P_TYPE(vha->hw))
+                return -EINVAL;
+
+        if (sscanf(buf, "%d", &val) != 1)
+                return -EINVAL;
+
+        vha->hw->allow_cna_fw_dump = val != 0;
+
+        return strlen(buf);
+}
+
 static DEVICE_ATTR(driver_version, S_IRUGO, qla2x00_drvr_version_show, NULL);
 static DEVICE_ATTR(fw_version, S_IRUGO, qla2x00_fw_version_show, NULL);
 static DEVICE_ATTR(serial_num, S_IRUGO, qla2x00_serial_num_show, NULL);
@@ -1544,6 +1575,9 @@ static DEVICE_ATTR(thermal_temp, S_IRUGO, qla2x00_thermal_temp_show, NULL);
 static DEVICE_ATTR(diag_requests, S_IRUGO, qla2x00_diag_requests_show, NULL);
 static DEVICE_ATTR(diag_megabytes, S_IRUGO, qla2x00_diag_megabytes_show, NULL);
 static DEVICE_ATTR(fw_dump_size, S_IRUGO, qla2x00_fw_dump_size_show, NULL);
+static DEVICE_ATTR(allow_cna_fw_dump, S_IRUGO | S_IWUSR,
+                   qla2x00_allow_cna_fw_dump_show,
+                   qla2x00_allow_cna_fw_dump_store);
 
 struct device_attribute *qla2x00_host_attrs[] = {
         &dev_attr_driver_version,
@@ -1576,6 +1610,7 @@ struct device_attribute *qla2x00_host_attrs[] = {
         &dev_attr_diag_requests,
         &dev_attr_diag_megabytes,
         &dev_attr_fw_dump_size,
+        &dev_attr_allow_cna_fw_dump,
         NULL,
 };