[SCSI] mvsas: Add driver version and interrupt coalescing to device attributes in sysfs
Signed-off-by: Xiangliang Yu <yuxiangl@marvell.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
diff --git a/drivers/scsi/mvsas/mv_init.c b/drivers/scsi/mvsas/mv_init.c
index 9f1cccc..531093d 100644
--- a/drivers/scsi/mvsas/mv_init.c
+++ b/drivers/scsi/mvsas/mv_init.c
@@ -34,6 +34,8 @@
"\tThe mvsas SAS LLDD supports both modes.\n"
"\tDefault: 1 (Direct Mode).\n");
+int interrupt_coalescing = 0x80;
+
static struct scsi_transport_template *mvs_stt;
struct kmem_cache *mvs_task_list_cache;
static const struct mvs_chip_info mvs_chips[] = {
@@ -48,6 +50,8 @@
[chip_1320] = { 2, 4, 0x800, 17, 64, 9, &mvs_94xx_dispatch, },
};
+struct device_attribute *mvst_host_attrs[];
+
#define SOC_SAS_NUM 2
#define SG_MX 64
@@ -74,6 +78,7 @@
.slave_alloc = mvs_slave_alloc,
.target_destroy = sas_target_destroy,
.ioctl = sas_ioctl,
+ .shost_attrs = mvst_host_attrs,
};
static struct sas_domain_function_template mvs_transport_ops = {
@@ -706,6 +711,70 @@
.remove = __devexit_p(mvs_pci_remove),
};
+static ssize_t
+mvs_show_driver_version(struct device *cdev,
+ struct device_attribute *attr, char *buffer)
+{
+ return snprintf(buffer, PAGE_SIZE, "%s\n", DRV_VERSION);
+}
+
+static DEVICE_ATTR(driver_version,
+ S_IRUGO,
+ mvs_show_driver_version,
+ NULL);
+
+static ssize_t
+mvs_store_interrupt_coalescing(struct device *cdev,
+ struct device_attribute *attr,
+ const char *buffer, size_t size)
+{
+ int val = 0;
+ struct mvs_info *mvi = NULL;
+ struct Scsi_Host *shost = class_to_shost(cdev);
+ struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
+ u8 i, core_nr;
+ if (buffer == NULL)
+ return size;
+
+ if (sscanf(buffer, "%d", &val) != 1)
+ return -EINVAL;
+
+ if (val >= 0x10000) {
+ mv_dprintk("interrupt coalescing timer %d us is"
+ "too long\n", val);
+ return strlen(buffer);
+ }
+
+ interrupt_coalescing = val;
+
+ core_nr = ((struct mvs_prv_info *)sha->lldd_ha)->n_host;
+ mvi = ((struct mvs_prv_info *)sha->lldd_ha)->mvi[0];
+
+ if (unlikely(!mvi))
+ return -EINVAL;
+
+ for (i = 0; i < core_nr; i++) {
+ mvi = ((struct mvs_prv_info *)sha->lldd_ha)->mvi[i];
+ if (MVS_CHIP_DISP->tune_interrupt)
+ MVS_CHIP_DISP->tune_interrupt(mvi,
+ interrupt_coalescing);
+ }
+ mv_dprintk("set interrupt coalescing time to %d us\n",
+ interrupt_coalescing);
+ return strlen(buffer);
+}
+
+static ssize_t mvs_show_interrupt_coalescing(struct device *cdev,
+ struct device_attribute *attr, char *buffer)
+{
+ return snprintf(buffer, PAGE_SIZE, "%d\n", interrupt_coalescing);
+}
+
+static DEVICE_ATTR(interrupt_coalescing,
+ S_IRUGO|S_IWUSR,
+ mvs_show_interrupt_coalescing,
+ mvs_store_interrupt_coalescing);
+
/* task handler */
struct task_struct *mvs_th;
static int __init mvs_init(void)
@@ -742,6 +811,12 @@
kmem_cache_destroy(mvs_task_list_cache);
}
+struct device_attribute *mvst_host_attrs[] = {
+ &dev_attr_driver_version,
+ &dev_attr_interrupt_coalescing,
+ NULL,
+};
+
module_init(mvs_init);
module_exit(mvs_exit);