[SCSI] ipr: Provide reset_adapter retry method for offlined adapters

If an ipr adapter repeatedly fails its initialization
the ipr driver will take the adapter offline and never talk
to it again. This provides a method for the user to manually
try the initialization again through sysfs.

Signed-off-by: Brian King <brking@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index 1d440f2..eae61d9 100644 (file)
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -2179,6 +2179,74 @@ static struct class_device_attribute ipr_diagnostics_attr = {
        .store = ipr_store_diagnostics
 };
 
+/**
+ * ipr_show_adapter_state - Show the adapter's state
+ * @class_dev: class device struct
+ * @buf:               buffer
+ *
+ * Return value:
+ *     number of bytes printed to buffer
+ **/
+static ssize_t ipr_show_adapter_state(struct class_device *class_dev, char *buf)
+{
+       struct Scsi_Host *shost = class_to_shost(class_dev);
+       struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)shost->hostdata;
+       unsigned long lock_flags = 0;
+       int len;
+
+       spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
+       if (ioa_cfg->ioa_is_dead)
+               len = snprintf(buf, PAGE_SIZE, "offline\n");
+       else
+               len = snprintf(buf, PAGE_SIZE, "online\n");
+       spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
+       return len;
+}
+
+/**
+ * ipr_store_adapter_state - Change adapter state
+ * @class_dev: class_device struct
+ * @buf:               buffer
+ * @count:             buffer size
+ *
+ * This function will change the adapter's state.
+ *
+ * Return value:
+ *     count on success / other on failure
+ **/
+static ssize_t ipr_store_adapter_state(struct class_device *class_dev,
+                                      const char *buf, size_t count)
+{
+       struct Scsi_Host *shost = class_to_shost(class_dev);
+       struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)shost->hostdata;
+       unsigned long lock_flags;
+       int result = count;
+
+       if (!capable(CAP_SYS_ADMIN))
+               return -EACCES;
+
+       spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
+       if (ioa_cfg->ioa_is_dead && !strncmp(buf, "online", 6)) {
+               ioa_cfg->ioa_is_dead = 0;
+               ioa_cfg->reset_retries = 0;
+               ioa_cfg->in_ioa_bringdown = 0;
+               ipr_initiate_ioa_reset(ioa_cfg, IPR_SHUTDOWN_NONE);
+       }
+       spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
+       wait_event(ioa_cfg->reset_wait_q, !ioa_cfg->in_reset_reload);
+
+       return result;
+}
+
+static struct class_device_attribute ipr_ioa_state_attr = {
+       .attr = {
+               .name =         "state",
+               .mode =         S_IRUGO | S_IWUSR,
+       },
+       .show = ipr_show_adapter_state,
+       .store = ipr_store_adapter_state
+};
+
 /**
  * ipr_store_reset_adapter - Reset the adapter
  * @class_dev: class_device struct
@@ -2515,6 +2583,7 @@ static struct class_device_attribute *ipr_ioa_attrs[] = {
        &ipr_fw_version_attr,
        &ipr_log_level_attr,
        &ipr_diagnostics_attr,
+       &ipr_ioa_state_attr,
        &ipr_ioa_reset_attr,
        &ipr_update_fw_attr,
        &ipr_ioa_cache_attr,