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authorBrian King <brking@linux.vnet.ibm.com>2010-02-21 10:37:58 -0600
committerJames Bottomley <James.Bottomley@suse.de>2010-03-03 18:32:42 +0530
commitb0f4d4cf12d0eaa0bd766686bba843fc105b6a60 (patch)
treed0a823022733c97e66b8946db97369fd3133e69c
parent64355b929dec0cb6271e4ac7834c9cf262961e40 (diff)
downloadop-kernel-dev-b0f4d4cf12d0eaa0bd766686bba843fc105b6a60.zip
op-kernel-dev-b0f4d4cf12d0eaa0bd766686bba843fc105b6a60.tar.gz
[SCSI] ibmvfc: Add suspend/resume support
Adds support for resuming from suspend for IBM VFC devices. We may have lost an interrupt over the suspend, so we just kick the interrupt handler to process anything that is outstanding. We expect to find a transport event indicating we need to reestablish our CRQ. Signed-off-by: Brian King <brking@linux.vnet.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
-rw-r--r--drivers/scsi/ibmvscsi/ibmvfc.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index 732f6d3..4e577e2 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -29,6 +29,7 @@
#include <linux/interrupt.h>
#include <linux/kthread.h>
#include <linux/of.h>
+#include <linux/pm.h>
#include <linux/stringify.h>
#include <asm/firmware.h>
#include <asm/irq.h>
@@ -4736,6 +4737,27 @@ static int ibmvfc_remove(struct vio_dev *vdev)
}
/**
+ * ibmvfc_resume - Resume from suspend
+ * @dev: device struct
+ *
+ * We may have lost an interrupt across suspend/resume, so kick the
+ * interrupt handler
+ *
+ */
+static int ibmvfc_resume(struct device *dev)
+{
+ unsigned long flags;
+ struct ibmvfc_host *vhost = dev_get_drvdata(dev);
+ struct vio_dev *vdev = to_vio_dev(dev);
+
+ spin_lock_irqsave(vhost->host->host_lock, flags);
+ vio_disable_interrupts(vdev);
+ tasklet_schedule(&vhost->tasklet);
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ return 0;
+}
+
+/**
* ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
* @vdev: vio device struct
*
@@ -4755,6 +4777,10 @@ static struct vio_device_id ibmvfc_device_table[] __devinitdata = {
};
MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
+static struct dev_pm_ops ibmvfc_pm_ops = {
+ .resume = ibmvfc_resume
+};
+
static struct vio_driver ibmvfc_driver = {
.id_table = ibmvfc_device_table,
.probe = ibmvfc_probe,
@@ -4763,6 +4789,7 @@ static struct vio_driver ibmvfc_driver = {
.driver = {
.name = IBMVFC_NAME,
.owner = THIS_MODULE,
+ .pm = &ibmvfc_pm_ops,
}
};
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