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ibmvfc: Add support for collaborative memory overcommit
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Adds support to the ibmvfc driver for collaborative memory overcommit.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Robert Jennings <rcj@linux.vnet.ibm.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Brian King authored and Benjamin Herrenschmidt committed Jul 25, 2008
1 parent 7912a0a commit 39c1ffe
Showing 1 changed file with 15 additions and 0 deletions.
15 changes: 15 additions & 0 deletions drivers/scsi/ibmvscsi/ibmvfc.c
Original file line number Diff line number Diff line change
Expand Up @@ -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"},
{ "", "" }
Expand All @@ -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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