[SCSI] aacraid: add user initiated reset

Add the ability for an application to issue a hardware reset to the
adapter via sysfs. Typical uses include restarting the adapter after it
has been flashed. Bumped revision number for the driver and added a
feature to periodically check the adapter's health (check_interval),
update the adapter's concept of time (update_interval) and block
checking/resetting of the adapter (check_reset).

Signed-off-by: Mark Salyzyn <aacraid@adaptec.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 43 insertions, 3 deletions

diff --git a/drivers/scsi/aacraid/linit.c b/drivers/scsi/aacraid/linit.c
index 6f92d077679f..f8c2aaf72aff 100644
--- a/drivers/scsi/aacraid/linit.c
+++ b/drivers/scsi/aacraid/linit.c
@@ -39,10 +39,8 @@
 #include <linux/pci.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
-#include <linux/dma-mapping.h>
 #include <linux/syscalls.h>
 #include <linux/delay.h>
-#include <linux/smp_lock.h>
 #include <linux/kthread.h>
 #include <asm/semaphore.h>
 
@@ -581,6 +579,14 @@ static int aac_eh_reset(struct scsi_cmnd* cmd)
                 ssleep(1);
         }
         printk(KERN_ERR "%s: SCSI bus appears hung\n", AAC_DRIVERNAME);
+        /*
+         * This adapter needs a blind reset, only do so for Adapters that
+         * support a register, instead of a commanded, reset.
+         */
+        if ((aac->supplement_adapter_info.SupportedOptions2 &
+          le32_to_cpu(AAC_OPTION_MU_RESET|AAC_OPTION_IGNORE_RESET)) ==
+          le32_to_cpu(AAC_OPTION_MU_RESET))
+                aac_reset_adapter(aac, 2); /* Bypass wait for command quiesce */
         return SUCCESS; /* Cause an immediate retry of the command with a ten second delay after successful tur */
 }
 
@@ -788,6 +794,31 @@ static ssize_t aac_show_max_id(struct class_device *class_dev, char *buf)
           class_to_shost(class_dev)->max_id);
 }
 
+static ssize_t aac_store_reset_adapter(struct class_device *class_dev,
+                const char *buf, size_t count)
+{
+        int retval = -EACCES;
+
+        if (!capable(CAP_SYS_ADMIN))
+                return retval;
+        retval = aac_reset_adapter((struct aac_dev*)class_to_shost(class_dev)->hostdata, buf[0] == '!');
+        if (retval >= 0)
+                retval = count;
+        return retval;
+}
+
+static ssize_t aac_show_reset_adapter(struct class_device *class_dev,
+                char *buf)
+{
+        struct aac_dev *dev = (struct aac_dev*)class_to_shost(class_dev)->hostdata;
+        int len, tmp;
+
+        tmp = aac_adapter_check_health(dev);
+        if ((tmp == 0) && dev->in_reset)
+                tmp = -EBUSY;
+        len = snprintf(buf, PAGE_SIZE, "0x%x", tmp);
+        return len;
+}
 
 static struct class_device_attribute aac_model = {
         .attr = {
@@ -845,6 +876,14 @@ static struct class_device_attribute aac_max_id = {
         },
         .show = aac_show_max_id,
 };
+static struct class_device_attribute aac_reset = {
+        .attr = {
+                .name = "reset_host",
+                .mode = S_IWUSR|S_IRUGO,
+        },
+        .store = aac_store_reset_adapter,
+        .show = aac_show_reset_adapter,
+};
 
 static struct class_device_attribute *aac_attrs[] = {
         &aac_model,
@@ -855,6 +894,7 @@ static struct class_device_attribute *aac_attrs[] = {
         &aac_serial_number,
         &aac_max_channel,
         &aac_max_id,
+        &aac_reset,
         NULL
 };
 
@@ -1118,7 +1158,7 @@ static int __init aac_init(void)
 {
         int error;
         
-        printk(KERN_INFO "Adaptec %s driver (%s)\n",
+        printk(KERN_INFO "Adaptec %s driver %s\n",
           AAC_DRIVERNAME, aac_driver_version);
 
         error = pci_register_driver(&aac_pci_driver);