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authorBrian King <brking@linux.vnet.ibm.com>2008-07-23 14:35:48 -0400
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2008-07-25 01:44:45 -0400
commit39c1ffecc6aabcc8105602a95ce769f27bcf6048 (patch)
tree69850b0c50c8628db3276581575757c4854519c8 /drivers/scsi/ibmvscsi
parent7912a0ac5907df1f8b214b3ca15ccf96129daae0 (diff)
ibmvfc: Add support for collaborative memory overcommit
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>
Diffstat (limited to 'drivers/scsi/ibmvscsi')
-rw-r--r--drivers/scsi/ibmvscsi/ibmvfc.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index eb702b96d57c..c4a7c06793c5 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)
3819 return 0; 3819 return 0;
3820} 3820}
3821 3821
3822/**
3823 * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
3824 * @vdev: vio device struct
3825 *
3826 * Return value:
3827 * Number of bytes the driver will need to DMA map at the same time in
3828 * order to perform well.
3829 */
3830static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
3831{
3832 unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu);
3833 return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
3834}
3835
3822static struct vio_device_id ibmvfc_device_table[] __devinitdata = { 3836static struct vio_device_id ibmvfc_device_table[] __devinitdata = {
3823 {"fcp", "IBM,vfc-client"}, 3837 {"fcp", "IBM,vfc-client"},
3824 { "", "" } 3838 { "", "" }
@@ -3829,6 +3843,7 @@ static struct vio_driver ibmvfc_driver = {
3829 .id_table = ibmvfc_device_table, 3843 .id_table = ibmvfc_device_table,
3830 .probe = ibmvfc_probe, 3844 .probe = ibmvfc_probe,
3831 .remove = ibmvfc_remove, 3845 .remove = ibmvfc_remove,
3846 .get_desired_dma = ibmvfc_get_desired_dma,
3832 .driver = { 3847 .driver = {
3833 .name = IBMVFC_NAME, 3848 .name = IBMVFC_NAME,
3834 .owner = THIS_MODULE, 3849 .owner = THIS_MODULE,