diff --git a/drivers/scsi/megaraid/megaraid_sas.c b/drivers/scsi/megaraid/megaraid_sas.c
index 08c3d4315eb8b71adc03823bfd5814d346b2e4cf..499f994f503d7f90e3b5f42cec4a23a24740dc1f 100644
--- a/drivers/scsi/megaraid/megaraid_sas.c
+++ b/drivers/scsi/megaraid/megaraid_sas.c
@@ -47,6 +47,14 @@
#include <scsi/scsi_host.h>
#include "megaraid_sas.h"
+/*
+ * poll_mode_io:1- schedule complete completion from q cmd
+ */
+static unsigned int poll_mode_io;
+module_param_named(poll_mode_io, poll_mode_io, int, 0);
+MODULE_PARM_DESC(poll_mode_io,
+ "Complete cmds from IO path, (default=0)");
+
MODULE_LICENSE("GPL");
MODULE_VERSION(MEGASAS_VERSION);
MODULE_AUTHOR("megaraidlinux@lsi.com");
@@ -860,6 +868,12 @@ megasas_queue_command(struct scsi_cmnd *scmd, void (*done) (struct scsi_cmnd *))
atomic_inc(&instance->fw_outstanding);
instance->instancet->fire_cmd(cmd->frame_phys_addr ,cmd->frame_count-1,instance->reg_set);
+ /*
+ * Check if we have pend cmds to be completed
+ */
+ if (poll_mode_io && atomic_read(&instance->fw_outstanding))
+ tasklet_schedule(&instance->isr_tasklet);
+
return 0;
@@ -1891,6 +1905,47 @@ megasas_issue_init_mfi(struct megasas_instance *instance)
return -EINVAL;
}
+/**
+ * megasas_start_timer - Initializes a timer object
+ * @instance: Adapter soft state
+ * @timer: timer object to be initialized
+ * @fn: timer function
+ * @interval: time interval between timer function call
+ */
+static inline void
+megasas_start_timer(struct megasas_instance *instance,
+ struct timer_list *timer,
+ void *fn, unsigned long interval)
+{
+ init_timer(timer);
+ timer->expires = jiffies + interval;
+ timer->data = (unsigned long)instance;
+ timer->function = fn;
+ add_timer(timer);
+}
+
+/**
+ * megasas_io_completion_timer - Timer fn
+ * @instance_addr: Address of adapter soft state
+ *
+ * Schedules tasklet for cmd completion
+ * if poll_mode_io is set
+ */
+static void
+megasas_io_completion_timer(unsigned long instance_addr)
+{
+ struct megasas_instance *instance =
+ (struct megasas_instance *)instance_addr;
+
+ if (atomic_read(&instance->fw_outstanding))
+ tasklet_schedule(&instance->isr_tasklet);
+
+ /* Restart timer */
+ if (poll_mode_io)
+ mod_timer(&instance->io_completion_timer,
+ jiffies + MEGASAS_COMPLETION_TIMER_INTERVAL);
+}
+
/**
* megasas_init_mfi - Initializes the FW
* @instance: Adapter soft state
@@ -2017,8 +2072,14 @@ static int megasas_init_mfi(struct megasas_instance *instance)
* Setup tasklet for cmd completion
*/
- tasklet_init(&instance->isr_tasklet, megasas_complete_cmd_dpc,
- (unsigned long)instance);
+ tasklet_init(&instance->isr_tasklet, megasas_complete_cmd_dpc,
+ (unsigned long)instance);
+
+ /* Initialize the cmd completion timer */
+ if (poll_mode_io)
+ megasas_start_timer(instance, &instance->io_completion_timer,
+ megasas_io_completion_timer,
+ MEGASAS_COMPLETION_TIMER_INTERVAL);
return 0;
fail_fw_init:
@@ -2578,8 +2639,8 @@ static void megasas_shutdown_controller(struct megasas_instance *instance,
}
/**
- * megasas_suspend - driver suspend entry point
- * @pdev: PCI device structure
+ * megasas_suspend - driver suspend entry point
+ * @pdev: PCI device structure
* @state: PCI power state to suspend routine
*/
static int __devinit
@@ -2591,6 +2652,9 @@ megasas_suspend(struct pci_dev *pdev, pm_message_t state)
instance = pci_get_drvdata(pdev);
host = instance->host;
+ if (poll_mode_io)
+ del_timer_sync(&instance->io_completion_timer);
+
megasas_flush_cache(instance);
megasas_shutdown_controller(instance, MR_DCMD_HIBERNATE_SHUTDOWN);
tasklet_kill(&instance->isr_tasklet);
@@ -2677,6 +2741,11 @@ megasas_resume(struct pci_dev *pdev)
if (megasas_start_aen(instance))
printk(KERN_ERR "megasas: Start AEN failed\n");
+ /* Initialize the cmd completion timer */
+ if (poll_mode_io)
+ megasas_start_timer(instance, &instance->io_completion_timer,
+ megasas_io_completion_timer,
+ MEGASAS_COMPLETION_TIMER_INTERVAL);
return 0;
fail_irq:
@@ -2715,6 +2784,9 @@ static void megasas_detach_one(struct pci_dev *pdev)
instance = pci_get_drvdata(pdev);
host = instance->host;
+ if (poll_mode_io)
+ del_timer_sync(&instance->io_completion_timer);
+
scsi_remove_host(instance->host);
megasas_flush_cache(instance);
megasas_shutdown_controller(instance, MR_DCMD_CTRL_SHUTDOWN);
@@ -3188,7 +3260,7 @@ static DRIVER_ATTR(release_date, S_IRUGO, megasas_sysfs_show_release_date,
static ssize_t
megasas_sysfs_show_dbg_lvl(struct device_driver *dd, char *buf)
{
- return sprintf(buf,"%u",megasas_dbg_lvl);
+ return sprintf(buf, "%u\n", megasas_dbg_lvl);
}
static ssize_t
@@ -3203,7 +3275,65 @@ megasas_sysfs_set_dbg_lvl(struct device_driver *dd, const char *buf, size_t coun
}
static DRIVER_ATTR(dbg_lvl, S_IRUGO|S_IWUGO, megasas_sysfs_show_dbg_lvl,
- megasas_sysfs_set_dbg_lvl);
+ megasas_sysfs_set_dbg_lvl);
+
+static ssize_t
+megasas_sysfs_show_poll_mode_io(struct device_driver *dd, char *buf)
+{
+ return sprintf(buf, "%u\n", poll_mode_io);
+}
+
+static ssize_t
+megasas_sysfs_set_poll_mode_io(struct device_driver *dd,
+ const char *buf, size_t count)
+{
+ int retval = count;
+ int tmp = poll_mode_io;
+ int i;
+ struct megasas_instance *instance;
+
+ if (sscanf(buf, "%u", &poll_mode_io) < 1) {
+ printk(KERN_ERR "megasas: could not set poll_mode_io\n");
+ retval = -EINVAL;
+ }
+
+ /*
+ * Check if poll_mode_io is already set or is same as previous value
+ */
+ if ((tmp && poll_mode_io) || (tmp == poll_mode_io))
+ goto out;
+
+ if (poll_mode_io) {
+ /*
+ * Start timers for all adapters
+ */
+ for (i = 0; i < megasas_mgmt_info.max_index; i++) {
+ instance = megasas_mgmt_info.instance[i];
+ if (instance) {
+ megasas_start_timer(instance,
+ &instance->io_completion_timer,
+ megasas_io_completion_timer,
+ MEGASAS_COMPLETION_TIMER_INTERVAL);
+ }
+ }
+ } else {
+ /*
+ * Delete timers for all adapters
+ */
+ for (i = 0; i < megasas_mgmt_info.max_index; i++) {
+ instance = megasas_mgmt_info.instance[i];
+ if (instance)
+ del_timer_sync(&instance->io_completion_timer);
+ }
+ }
+
+out:
+ return retval;
+}
+
+static DRIVER_ATTR(poll_mode_io, S_IRUGO|S_IWUGO,
+ megasas_sysfs_show_poll_mode_io,
+ megasas_sysfs_set_poll_mode_io);
/**
* megasas_init - Driver load entry point
@@ -3254,8 +3384,16 @@ static int __init megasas_init(void)
&driver_attr_dbg_lvl);
if (rval)
goto err_dcf_dbg_lvl;
+ rval = driver_create_file(&megasas_pci_driver.driver,
+ &driver_attr_poll_mode_io);
+ if (rval)
+ goto err_dcf_poll_mode_io;
return rval;
+
+err_dcf_poll_mode_io:
+ driver_remove_file(&megasas_pci_driver.driver,
+ &driver_attr_dbg_lvl);
err_dcf_dbg_lvl:
driver_remove_file(&megasas_pci_driver.driver,
&driver_attr_release_date);
@@ -3273,6 +3411,8 @@ static int __init megasas_init(void)
*/
static void __exit megasas_exit(void)
{
+ driver_remove_file(&megasas_pci_driver.driver,
+ &driver_attr_poll_mode_io);
driver_remove_file(&megasas_pci_driver.driver,
&driver_attr_dbg_lvl);
driver_remove_file(&megasas_pci_driver.driver,
diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h
index c3575a304c6a3401b8af1e49962e262baf03b357..dcc66fc9c2cbdab3553f9c3191020fdfd49a9c1c 100644
--- a/drivers/scsi/megaraid/megaraid_sas.h
+++ b/drivers/scsi/megaraid/megaraid_sas.h
@@ -572,6 +572,7 @@ struct megasas_ctrl_info {
#define MFI_OB_INTR_STATUS_MASK 0x00000002
#define MFI_POLL_TIMEOUT_SECS 60
+#define MEGASAS_COMPLETION_TIMER_INTERVAL (HZ/10)
#define MFI_REPLY_1078_MESSAGE_INTERRUPT 0x80000000
@@ -1111,6 +1112,8 @@ struct megasas_instance {
u8 flag;
unsigned long last_time;
+
+ struct timer_list io_completion_timer;
};
#define MEGASAS_IS_LOGICAL(scp) \