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Subject[PATCH 2/10] scsi: megaraid_sas - Add Poll Wait mechanism to MegaRAID SAS driver (PART-I)
Add Poll_wait mechanism to SAS-2 MegaRAID SAS Linux driver. Driver will wakeup poll after the driver get event from MegaRAID SAS FW.  Driver also reregisters for Event with the FW when it receives AEN.

Signed-off-by Bo Yang<bo.yang@lsi.com>

---
drivers/scsi/megaraid/megaraid_sas.c | 136 ++++++++++++++++++++++++++++++++++-
drivers/scsi/megaraid/megaraid_sas.h | 18 ++++
2 files changed, 153 insertions(+), 1 deletion(-)
diff -rupN linux-2.6.28_orig/drivers/scsi/megaraid/megaraid_sas.c linux-2.6.28_new/drivers/scsi/megaraid/megaraid_sas.c
--- linux-2.6.28_orig/drivers/scsi/megaraid/megaraid_sas.c 2009-05-04 20:10:20.000000000 -0400
+++ linux-2.6.28_new/drivers/scsi/megaraid/megaraid_sas.c 2009-05-04 20:11:52.000000000 -0400
@@ -40,6 +40,7 @@
#include <linux/compat.h>
#include <linux/blkdev.h>
#include <linux/mutex.h>
+#include <linux/poll.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
@@ -89,6 +90,9 @@ static struct megasas_mgmt_info megasas_
static struct fasync_struct *megasas_async_queue;
static DEFINE_MUTEX(megasas_async_queue_mutex);

+static int megasas_poll_wait_aen;
+static DECLARE_WAIT_QUEUE_HEAD(megasas_poll_wait);
+
static u32 megasas_dbg_lvl;

static void
@@ -1277,6 +1281,8 @@ megasas_bios_param(struct scsi_device *s
return 0;
}

+static void megasas_aen_polling(struct megasas_instance *instance);
+
/**
* megasas_service_aen - Processes an event notification
* @instance: Adapter soft state
@@ -1295,13 +1301,20 @@ megasas_service_aen(struct megasas_insta
/*
* Don't signal app if it is just an aborted previously registered aen
*/
- if (!cmd->abort_aen)
+ if ((!cmd->abort_aen) && (instance->unload == 0)) {
+ megasas_poll_wait_aen = 1;
+ wake_up(&megasas_poll_wait);
kill_fasync(&megasas_async_queue, SIGIO, POLL_IN);
+ }
else
cmd->abort_aen = 0;

instance->aen_cmd = NULL;
megasas_return_cmd(instance, cmd);
+
+ if ((!cmd->abort_aen) && (instance->unload == 0)) {
+ megasas_aen_polling(instance);
+ }
}

/*
@@ -2583,6 +2596,8 @@ megasas_probe_one(struct pci_dev *pdev,

*instance->producer = 0;
*instance->consumer = 0;
+ megasas_poll_wait_aen = 0;
+ instance->hotplug_wk = NULL;

instance->evt_detail = pci_alloc_consistent(pdev,
sizeof(struct
@@ -2621,6 +2636,7 @@ megasas_probe_one(struct pci_dev *pdev,

megasas_dbg_lvl = 0;
instance->flag = 0;
+ instance->unload = 0;
instance->last_time = 0;

/*
@@ -2924,6 +2940,7 @@ static void __devexit megasas_detach_one
struct megasas_instance *instance;

instance = pci_get_drvdata(pdev);
+ instance->unload = 1;
host = instance->host;

if (poll_mode_io)
@@ -2932,6 +2949,15 @@ static void __devexit megasas_detach_one
scsi_remove_host(instance->host);
megasas_flush_cache(instance);
megasas_shutdown_controller(instance, MR_DCMD_CTRL_SHUTDOWN);
+
+ /*
+ * cancel the delayed work if this work still in queue
+ */
+ if (instance->hotplug_wk != NULL) {
+ cancel_delayed_work(
+ (struct delayed_work *)instance->hotplug_wk);
+ flush_scheduled_work();
+ }
tasklet_kill(&instance->isr_tasklet);

/*
@@ -3027,6 +3053,19 @@ static int megasas_mgmt_fasync(int fd, s
}

/**
+ * megasas_mgmt_poll - char node "poll" entry point
+ * */
+static unsigned int megasas_mgmt_poll(struct file *file, poll_table *wait)
+{
+ unsigned int mask = 0;
+ poll_wait(file, &megasas_poll_wait, wait);
+ if (megasas_poll_wait_aen) {
+ mask |= (POLLIN | POLLRDNORM);
+ }
+ return mask;
+}
+
+/**
* megasas_mgmt_fw_ioctl - Issues management ioctls to FW
* @instance: Adapter soft state
* @argp: User's ioctl packet
@@ -3348,6 +3387,7 @@ static const struct file_operations mega
.open = megasas_mgmt_open,
.fasync = megasas_mgmt_fasync,
.unlocked_ioctl = megasas_mgmt_ioctl,
+ .poll = megasas_mgmt_poll,
#ifdef CONFIG_COMPAT
.compat_ioctl = megasas_mgmt_compat_ioctl,
#endif
@@ -3462,6 +3502,100 @@ out:
return retval;
}

+static void
+megasas_scsi_scan_host(struct work_struct *work)
+{
+ struct megasas_aen_event *ev = container_of(work,
+ struct megasas_aen_event, hotplug_work);
+ struct megasas_instance *instance = ev->instance;
+
+ instance->hotplug_wk = NULL;
+ if (!instance) {
+ printk(KERN_ERR "%s: invalid instance!\n", __FUNCTION__);
+ kfree(ev);
+ return;
+ }
+
+ printk(KERN_INFO "%s[%d]: scanning ...\n",
+ __FUNCTION__, instance->host->host_no);
+ scsi_scan_host(instance->host);
+ kfree(ev);
+}
+
+static void
+megasas_aen_polling(struct megasas_instance *instance)
+{
+ union megasas_evt_class_locale class_locale;
+ int doscan = 0;
+ u32 seq_num;
+ int error;
+
+ if (instance->evt_detail) {
+ printk(KERN_INFO "%s[%d]: event code 0x%04x\n", __FUNCTION__,
+ instance->host->host_no, instance->evt_detail->code);
+
+ switch (instance->evt_detail->code) {
+
+ case MR_EVT_LD_CREATED:
+ case MR_EVT_PD_INSERTED:
+ case MR_EVT_LD_DELETED:
+ case MR_EVT_LD_OFFLINE:
+ case MR_EVT_CFG_CLEARED:
+ case MR_EVT_PD_REMOVED:
+ case MR_EVT_FOREIGN_CFG_IMPORTED:
+ case MR_EVT_LD_STATE_CHANGE:
+ case MR_EVT_CTRL_HOST_BUS_SCAN_REQUESTED:
+ doscan = 1;
+ break;
+ default:
+ doscan = 0;
+ break;
+ }
+ } else {
+ printk(KERN_ERR "%s[%d]: invalid evt_detail!\n",
+ __FUNCTION__, instance->host->host_no);
+ return;
+ }
+
+ if (doscan) {
+ struct megasas_aen_event *ev;
+ ev = kzalloc(sizeof(*ev), GFP_ATOMIC);
+ if (!ev) {
+ printk(KERN_ERR "%s: out of memory\n", __FUNCTION__);
+ } else {
+ ev->instance = instance;
+ instance->hotplug_wk = &ev->hotplug_work;
+ INIT_WORK(&ev->hotplug_work, megasas_scsi_scan_host);
+ schedule_delayed_work(
+ (struct delayed_work *)&ev->hotplug_work, 0);
+ }
+ }
+
+ seq_num = instance->evt_detail->seq_num + 1;
+
+ /**
+ * Register AEN with FW for latest sequence number plus 1
+ **/
+
+ class_locale.members.reserved = 0;
+ class_locale.members.locale = MR_EVT_LOCALE_ALL;
+ class_locale.members.class = MR_EVT_CLASS_DEBUG;
+
+ if ( instance->aen_cmd != NULL ) {
+ return ;
+ }
+
+ mutex_lock(&instance->aen_mutex);
+ error = megasas_register_aen(instance, seq_num,
+ class_locale.word);
+ mutex_unlock(&instance->aen_mutex);
+
+ if (error)
+ printk(KERN_ERR "%s[%d]: register aen failed error %x\n",
+ __FUNCTION__, instance->host->host_no, error);
+}
+
+
static DRIVER_ATTR(poll_mode_io, S_IRUGO|S_IWUGO,
megasas_sysfs_show_poll_mode_io,
megasas_sysfs_set_poll_mode_io);
diff -rupN linux-2.6.28_orig/drivers/scsi/megaraid/megaraid_sas.h linux-2.6.28_new/drivers/scsi/megaraid/megaraid_sas.h
--- linux-2.6.28_orig/drivers/scsi/megaraid/megaraid_sas.h 2009-05-04 20:10:21.000000000 -0400
+++ linux-2.6.28_new/drivers/scsi/megaraid/megaraid_sas.h 2009-05-04 20:00:31.000000000 -0400
@@ -132,6 +132,17 @@
#define MR_DCMD_CLUSTER_RESET_ALL 0x08010100
#define MR_DCMD_CLUSTER_RESET_LD 0x08010200

+#define MR_EVT_CFG_CLEARED 0x0004
+
+#define MR_EVT_LD_STATE_CHANGE 0x0051
+#define MR_EVT_PD_INSERTED 0x005b
+#define MR_EVT_PD_REMOVED 0x0070
+#define MR_EVT_LD_CREATED 0x008a
+#define MR_EVT_LD_DELETED 0x008b
+#define MR_EVT_FOREIGN_CFG_IMPORTED 0x00db
+#define MR_EVT_LD_OFFLINE 0x00fc
+#define MR_EVT_CTRL_HOST_BUS_SCAN_REQUESTED 0x0152
+
/*
* MFI command completion codes
*/
@@ -1072,6 +1083,11 @@ struct megasas_evt_detail {
u32 (*read_fw_status_reg)(struct megasas_register_set __iomem *);
};

+struct megasas_aen_event {
+ struct work_struct hotplug_work;
+ struct megasas_instance *instance;
+};
+
struct megasas_instance {

u32 *producer;
@@ -1118,8 +1134,10 @@ struct megasas_instance {

struct megasas_instance_template *instancet;
struct tasklet_struct isr_tasklet;
+ struct work_struct *hotplug_wk;

u8 flag;
+ u8 unload;
unsigned long last_time;

struct timer_list io_completion_timer;

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