From: Brian King <brking@xxxxxxxxxxxxxxxxxx>
Adds support to the ibmvfc driver for collaborative memory overcommit.
Signed-off-by: Brian King <brking@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Robert Jennings <rcj@xxxxxxxxxxxxxxxxxx>
---
We would like to take this patch through linuxppc-dev with the full
change set for this feature. We are copying linux-scsi for review and ack.
---
drivers/scsi/ibmvscsi/ibmvfc.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
Index: b/drivers/scsi/ibmvscsi/ibmvfc.c
===================================================================
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -3819,6 +3819,20 @@ static int ibmvfc_remove(struct vio_dev
return 0;
}
+/**
+ * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
+ * @vdev: vio device struct
+ *
+ * Return value:
+ * Number of bytes the driver will need to DMA map at the same time in
+ * order to perform well.
+ */
+static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
+{
+ unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu);
+ return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
+}
+
static struct vio_device_id ibmvfc_device_table[] __devinitdata = {
{"fcp", "IBM,vfc-client"},
{ "", "" }
@@ -3829,6 +3843,7 @@ static struct vio_driver ibmvfc_driver =
.id_table = ibmvfc_device_table,
.probe = ibmvfc_probe,
.remove = ibmvfc_remove,
+ .get_desired_dma = ibmvfc_get_desired_dma,
.driver = {
.name = IBMVFC_NAME,
.owner = THIS_MODULE,
--
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