X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=drivers%2Fscsi%2Fibmvscsi%2Fibmvfc.c;h=c4a7c06793c5ff6bc96257cbc77868dd1c25e49c;hb=1ff8419871ea757ae0298aa296bcff9b2ca48561;hp=eb702b96d57cf7ac631af7e18406493bf7eef6d9;hpb=908cf4b925e419bc74f3297b2f0e51d6f8a81da2;p=linux-2.6

diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index eb702b96d5..c4a7c06793 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -3819,6 +3819,20 @@ static int ibmvfc_remove(struct vio_dev *vdev)
 	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,