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[SCSI] megaraid_sas: Add poll mechanism to megaraid sas driver
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
James Bottomley
parent
8d56825321
commit
c35188377f
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@ -40,6 +40,7 @@
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#include <linux/compat.h>
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#include <linux/blkdev.h>
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#include <linux/mutex.h>
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#include <linux/poll.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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@ -89,8 +90,14 @@ static struct megasas_mgmt_info megasas_mgmt_info;
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static struct fasync_struct *megasas_async_queue;
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static DEFINE_MUTEX(megasas_async_queue_mutex);
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static int megasas_poll_wait_aen;
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static DECLARE_WAIT_QUEUE_HEAD(megasas_poll_wait);
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static u32 megasas_dbg_lvl;
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/* define lock for aen poll */
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spinlock_t poll_aen_lock;
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static void
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megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd,
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u8 alt_status);
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@ -1292,11 +1299,17 @@ megasas_bios_param(struct scsi_device *sdev, struct block_device *bdev,
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static void
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megasas_service_aen(struct megasas_instance *instance, struct megasas_cmd *cmd)
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{
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unsigned long flags;
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/*
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* Don't signal app if it is just an aborted previously registered aen
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*/
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if (!cmd->abort_aen)
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if ((!cmd->abort_aen) && (instance->unload == 0)) {
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spin_lock_irqsave(&poll_aen_lock, flags);
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megasas_poll_wait_aen = 1;
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spin_unlock_irqrestore(&poll_aen_lock, flags);
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wake_up(&megasas_poll_wait);
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kill_fasync(&megasas_async_queue, SIGIO, POLL_IN);
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}
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else
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cmd->abort_aen = 0;
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@ -1381,6 +1394,7 @@ megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd,
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{
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int exception = 0;
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struct megasas_header *hdr = &cmd->frame->hdr;
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unsigned long flags;
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if (cmd->scmd)
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cmd->scmd->SCp.ptr = NULL;
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@ -1470,6 +1484,12 @@ megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd,
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case MFI_CMD_SMP:
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case MFI_CMD_STP:
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case MFI_CMD_DCMD:
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if (cmd->frame->dcmd.opcode == MR_DCMD_CTRL_EVENT_GET_INFO ||
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cmd->frame->dcmd.opcode == MR_DCMD_CTRL_EVENT_GET) {
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spin_lock_irqsave(&poll_aen_lock, flags);
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megasas_poll_wait_aen = 0;
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spin_unlock_irqrestore(&poll_aen_lock, flags);
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}
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/*
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* See if got an event notification
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@ -2583,6 +2603,7 @@ megasas_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
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*instance->producer = 0;
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*instance->consumer = 0;
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megasas_poll_wait_aen = 0;
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instance->evt_detail = pci_alloc_consistent(pdev,
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sizeof(struct
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@ -2607,6 +2628,7 @@ megasas_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
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spin_lock_init(&instance->cmd_pool_lock);
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spin_lock_init(&instance->completion_lock);
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spin_lock_init(&poll_aen_lock);
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mutex_init(&instance->aen_mutex);
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sema_init(&instance->ioctl_sem, MEGASAS_INT_CMDS);
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@ -2621,6 +2643,7 @@ megasas_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
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megasas_dbg_lvl = 0;
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instance->flag = 0;
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instance->unload = 0;
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instance->last_time = 0;
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/*
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@ -2924,6 +2947,7 @@ static void __devexit megasas_detach_one(struct pci_dev *pdev)
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struct megasas_instance *instance;
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instance = pci_get_drvdata(pdev);
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instance->unload = 1;
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host = instance->host;
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if (poll_mode_io)
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@ -3026,6 +3050,23 @@ static int megasas_mgmt_fasync(int fd, struct file *filep, int mode)
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return rc;
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}
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/**
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* megasas_mgmt_poll - char node "poll" entry point
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* */
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static unsigned int megasas_mgmt_poll(struct file *file, poll_table *wait)
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{
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unsigned int mask;
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unsigned long flags;
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poll_wait(file, &megasas_poll_wait, wait);
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spin_lock_irqsave(&poll_aen_lock, flags);
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if (megasas_poll_wait_aen)
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mask = (POLLIN | POLLRDNORM);
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else
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mask = 0;
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spin_unlock_irqrestore(&poll_aen_lock, flags);
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return mask;
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}
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/**
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* megasas_mgmt_fw_ioctl - Issues management ioctls to FW
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* @instance: Adapter soft state
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@ -3067,6 +3108,7 @@ megasas_mgmt_fw_ioctl(struct megasas_instance *instance,
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*/
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memcpy(cmd->frame, ioc->frame.raw, 2 * MEGAMFI_FRAME_SIZE);
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cmd->frame->hdr.context = cmd->index;
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cmd->frame->hdr.pad_0 = 0;
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/*
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* The management interface between applications and the fw uses
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@ -3348,6 +3390,7 @@ static const struct file_operations megasas_mgmt_fops = {
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.open = megasas_mgmt_open,
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.fasync = megasas_mgmt_fasync,
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.unlocked_ioctl = megasas_mgmt_ioctl,
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.poll = megasas_mgmt_poll,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = megasas_mgmt_compat_ioctl,
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#endif
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@ -1120,6 +1120,7 @@ struct megasas_instance {
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struct tasklet_struct isr_tasklet;
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u8 flag;
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u8 unload;
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unsigned long last_time;
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struct timer_list io_completion_timer;
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