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[SCSI] megaraid_sas: Add poll mechanism to megaraid sas driver

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Add Poll_wait mechanism to SAS-2 MegaRAID SAS Linux driver. Driver
will wakeup poll after the driver get event from MegaRAID SAS FW.

Signed-off-by Bo Yang<bo.yang@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Yang, Bo 2009-10-06 14:18:02 -06:00 committed by James Bottomley
parent 8d56825321
commit c35188377f
2 changed files with 45 additions and 1 deletions
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45
drivers/scsi/megaraid/megaraid_sas.c
View File

@ -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>
@ -89,8 +90,14 @@ static struct megasas_mgmt_info megasas_mgmt_info;
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;
/* define lock for aen poll */
spinlock_t poll_aen_lock;
static void
megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd,
u8 alt_status);
@ -1292,11 +1299,17 @@ megasas_bios_param(struct scsi_device *sdev, struct block_device *bdev,
static void
megasas_service_aen(struct megasas_instance *instance, struct megasas_cmd *cmd)
{
unsigned long flags;
/*
* Don't signal app if it is just an aborted previously registered aen
*/
if (!cmd->abort_aen)
if ((!cmd->abort_aen) && (instance->unload == 0)) {
spin_lock_irqsave(&poll_aen_lock, flags);
megasas_poll_wait_aen = 1;
spin_unlock_irqrestore(&poll_aen_lock, flags);
wake_up(&megasas_poll_wait);
kill_fasync(&megasas_async_queue, SIGIO, POLL_IN);
}
else
cmd->abort_aen = 0;
@ -1381,6 +1394,7 @@ megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd,
{
int exception = 0;
struct megasas_header *hdr = &cmd->frame->hdr;
unsigned long flags;
if (cmd->scmd)
cmd->scmd->SCp.ptr = NULL;
@ -1470,6 +1484,12 @@ megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd,
case MFI_CMD_SMP:
case MFI_CMD_STP:
case MFI_CMD_DCMD:
if (cmd->frame->dcmd.opcode == MR_DCMD_CTRL_EVENT_GET_INFO ||
cmd->frame->dcmd.opcode == MR_DCMD_CTRL_EVENT_GET) {
spin_lock_irqsave(&poll_aen_lock, flags);
megasas_poll_wait_aen = 0;
spin_unlock_irqrestore(&poll_aen_lock, flags);
}
/*
* See if got an event notification
@ -2583,6 +2603,7 @@ megasas_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
*instance->producer = 0;
*instance->consumer = 0;
megasas_poll_wait_aen = 0;
instance->evt_detail = pci_alloc_consistent(pdev,
sizeof(struct
@ -2607,6 +2628,7 @@ megasas_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
spin_lock_init(&instance->cmd_pool_lock);
spin_lock_init(&instance->completion_lock);
spin_lock_init(&poll_aen_lock);
mutex_init(&instance->aen_mutex);
sema_init(&instance->ioctl_sem, MEGASAS_INT_CMDS);
@ -2621,6 +2643,7 @@ megasas_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
megasas_dbg_lvl = 0;
instance->flag = 0;
instance->unload = 0;
instance->last_time = 0;
/*
@ -2924,6 +2947,7 @@ static void __devexit megasas_detach_one(struct pci_dev *pdev)
struct megasas_instance *instance;
instance = pci_get_drvdata(pdev);
instance->unload = 1;
host = instance->host;
if (poll_mode_io)
@ -3026,6 +3050,23 @@ static int megasas_mgmt_fasync(int fd, struct file *filep, int mode)
return rc;
}
/**
* megasas_mgmt_poll - char node "poll" entry point
* */
static unsigned int megasas_mgmt_poll(struct file *file, poll_table *wait)
{
unsigned int mask;
unsigned long flags;
poll_wait(file, &megasas_poll_wait, wait);
spin_lock_irqsave(&poll_aen_lock, flags);
if (megasas_poll_wait_aen)
mask = (POLLIN | POLLRDNORM);
else
mask = 0;
spin_unlock_irqrestore(&poll_aen_lock, flags);
return mask;
}
/**
* megasas_mgmt_fw_ioctl - Issues management ioctls to FW
* @instance: Adapter soft state
@ -3067,6 +3108,7 @@ megasas_mgmt_fw_ioctl(struct megasas_instance *instance,
*/
memcpy(cmd->frame, ioc->frame.raw, 2 * MEGAMFI_FRAME_SIZE);
cmd->frame->hdr.context = cmd->index;
cmd->frame->hdr.pad_0 = 0;
/*
* The management interface between applications and the fw uses
@ -3348,6 +3390,7 @@ static const struct file_operations megasas_mgmt_fops = {
.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

1
drivers/scsi/megaraid/megaraid_sas.h
View File

@ -1120,6 +1120,7 @@ struct megasas_instance {
struct tasklet_struct isr_tasklet;
u8 flag;
u8 unload;
unsigned long last_time;
struct timer_list io_completion_timer;