[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>

1 files changed, 69 insertions, 0 deletions

diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index 1d440f2763ca..eae61d994b90 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -2180,6 +2180,74 @@ static struct class_device_attribute ipr_diagnostics_attr = {
 };
 
 /**
+ * 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
  * @buf:                buffer
@@ -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,