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Commit 39c1ffec authored by Brian King's avatar Brian King Committed by Benjamin Herrenschmidt
Browse files

ibmvfc: Add support for collaborative memory overcommit 



Adds support to the ibmvfc driver for collaborative memory overcommit.

Signed-off-by: default avatarBrian King <brking@linux.vnet.ibm.com>
Signed-off-by: default avatarRobert Jennings <rcj@linux.vnet.ibm.com>
Acked-by: default avatarPaul Mackerras <paulus@samba.org>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 7912a0ac

drivers/scsi/ibmvscsi/ibmvfc.c

+15 −0
Original line number Diff line number Diff line
@@ -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,