1 files changed, 75 insertions, 0 deletions

diff --git a/drivers/scsi/mvsas/mv_init.c b/drivers/scsi/mvsas/mv_init.c
index 9f1cccc2a3e..531093ddc41 100644
--- a/drivers/scsi/mvsas/mv_init.c
+++ b/drivers/scsi/mvsas/mv_init.c
@@ -34,6 +34,8 @@ MODULE_PARM_DESC(collector, "\n"
         "\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 @@ static const struct mvs_chip_info mvs_chips[] = {
         [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 @@ static struct scsi_host_template mvs_sht = {
         .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 @@ static struct pci_driver mvs_pci_driver = {
         .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 @@ static void __exit mvs_exit(void)
         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);