aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/scsi/qla2xxx/qla_attr.c
diff options
context:
space:
mode:
authorAndrew Vasquez <andrew.vasquez@qlogic.com>2005-10-27 11:09:48 -0700
committerJames Bottomley <jejb@mulgrave.(none)>2005-10-28 11:52:11 -0500
commit4fdfefe52944f5c4132a372ed5c208962a73c3f2 (patch)
tree23e4c9cb3f899d82e07fcfc55d75744b919415e5 /drivers/scsi/qla2xxx/qla_attr.c
parent0eedfcf0cdac30b14d1e6c99abc6604347ef0af8 (diff)
downloadkernel_samsung_espresso10-4fdfefe52944f5c4132a372ed5c208962a73c3f2.zip
kernel_samsung_espresso10-4fdfefe52944f5c4132a372ed5c208962a73c3f2.tar.gz
kernel_samsung_espresso10-4fdfefe52944f5c4132a372ed5c208962a73c3f2.tar.bz2
[SCSI] qla2xxx: Add support to dynamically enable/disable ZIO.
ISP23xx and ISP24xx chips have support for an adaptive method of posting SCSI command completions for multiple SCSI commands during a single system interrupt. SCSI commands are placed on the system response queue without interrupting the host until 1) a delay timer expires; or 2) a SCSI command completes with an error. As long as the host software (qla2xxx) services the response queue for completions (this polling is done during queuecommand()) within the 'delay timer' period, the firmware will not generate system interrupt. Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'drivers/scsi/qla2xxx/qla_attr.c')
-rw-r--r--drivers/scsi/qla2xxx/qla_attr.c83
1 files changed, 83 insertions, 0 deletions
diff --git a/drivers/scsi/qla2xxx/qla_attr.c b/drivers/scsi/qla2xxx/qla_attr.c
index fc25cd8..47c9ecf 100644
--- a/drivers/scsi/qla2xxx/qla_attr.c
+++ b/drivers/scsi/qla2xxx/qla_attr.c
@@ -319,6 +319,83 @@ qla2x00_state_show(struct class_device *cdev, char *buf)
return len;
}
+static ssize_t
+qla2x00_zio_show(struct class_device *cdev, char *buf)
+{
+ scsi_qla_host_t *ha = to_qla_host(class_to_shost(cdev));
+ int len = 0;
+
+ switch (ha->zio_mode) {
+ case QLA_ZIO_MODE_5:
+ len += snprintf(buf + len, PAGE_SIZE-len, "Mode 5\n");
+ break;
+ case QLA_ZIO_MODE_6:
+ len += snprintf(buf + len, PAGE_SIZE-len, "Mode 6\n");
+ break;
+ case QLA_ZIO_DISABLED:
+ len += snprintf(buf + len, PAGE_SIZE-len, "Disabled\n");
+ break;
+ }
+ return len;
+}
+
+static ssize_t
+qla2x00_zio_store(struct class_device *cdev, const char *buf, size_t count)
+{
+ scsi_qla_host_t *ha = to_qla_host(class_to_shost(cdev));
+ int val = 0;
+ uint16_t zio_mode;
+
+ if (sscanf(buf, "%d", &val) != 1)
+ return -EINVAL;
+
+ switch (val) {
+ case 1:
+ zio_mode = QLA_ZIO_MODE_5;
+ break;
+ case 2:
+ zio_mode = QLA_ZIO_MODE_6;
+ break;
+ default:
+ zio_mode = QLA_ZIO_DISABLED;
+ break;
+ }
+
+ /* Update per-hba values and queue a reset. */
+ if (zio_mode != QLA_ZIO_DISABLED || ha->zio_mode != QLA_ZIO_DISABLED) {
+ ha->zio_mode = zio_mode;
+ set_bit(ISP_ABORT_NEEDED, &ha->dpc_flags);
+ }
+ return strlen(buf);
+}
+
+static ssize_t
+qla2x00_zio_timer_show(struct class_device *cdev, char *buf)
+{
+ scsi_qla_host_t *ha = to_qla_host(class_to_shost(cdev));
+
+ return snprintf(buf, PAGE_SIZE, "%d us\n", ha->zio_timer * 100);
+}
+
+static ssize_t
+qla2x00_zio_timer_store(struct class_device *cdev, const char *buf,
+ size_t count)
+{
+ scsi_qla_host_t *ha = to_qla_host(class_to_shost(cdev));
+ int val = 0;
+ uint16_t zio_timer;
+
+ if (sscanf(buf, "%d", &val) != 1)
+ return -EINVAL;
+ if (val > 25500 || val < 100)
+ return -ERANGE;
+
+ zio_timer = (uint16_t)(val / 100);
+ ha->zio_timer = zio_timer;
+
+ return strlen(buf);
+}
+
static CLASS_DEVICE_ATTR(driver_version, S_IRUGO, qla2x00_drvr_version_show,
NULL);
static CLASS_DEVICE_ATTR(fw_version, S_IRUGO, qla2x00_fw_version_show, NULL);
@@ -329,6 +406,10 @@ static CLASS_DEVICE_ATTR(model_name, S_IRUGO, qla2x00_model_name_show, NULL);
static CLASS_DEVICE_ATTR(model_desc, S_IRUGO, qla2x00_model_desc_show, NULL);
static CLASS_DEVICE_ATTR(pci_info, S_IRUGO, qla2x00_pci_info_show, NULL);
static CLASS_DEVICE_ATTR(state, S_IRUGO, qla2x00_state_show, NULL);
+static CLASS_DEVICE_ATTR(zio, S_IRUGO | S_IWUSR, qla2x00_zio_show,
+ qla2x00_zio_store);
+static CLASS_DEVICE_ATTR(zio_timer, S_IRUGO | S_IWUSR, qla2x00_zio_timer_show,
+ qla2x00_zio_timer_store);
struct class_device_attribute *qla2x00_host_attrs[] = {
&class_device_attr_driver_version,
@@ -340,6 +421,8 @@ struct class_device_attribute *qla2x00_host_attrs[] = {
&class_device_attr_model_desc,
&class_device_attr_pci_info,
&class_device_attr_state,
+ &class_device_attr_zio,
+ &class_device_attr_zio_timer,
NULL,
};