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authorNoriyuki Fujii <n-fujii@np.css.fujitsu.com>2009-11-20 16:27:20 +0900
committerJames Bottomley <James.Bottomley@suse.de>2009-12-10 08:54:16 -0600
commitaeab3fd7b865bc4086a80a83cfdd67dded3b41a0 (patch)
tree131b4232f1406128464d34c0fbbb12ff66aede01 /drivers/scsi/osd
parentd8705f11d89cfabf4a9f0ea234d4809b22abb33e (diff)
[SCSI] megaraid_sas: make driver PCI legacy I/O port free driver
On the large servers, I/O port resource may not be assigned to all the PCI devices since it is limited (to 64KB on Intel Architecture[1]) and it may also be fragmented (I/O base register of PCI-to-PCI bridge will usually be aligned to a 4KB boundary[2]). If no I/O port resource is assigned to devices, those devices do not work. [1] Some machines support 64KB I/O port space per PCI segment. [2] Some P2P bridges support optional 1KB aligned I/O base. Therefore, I made a patch for MegaRAID SAS driver to make PCI legacy I/O port free. I have also tested the patch and it had no problem. The way to make PCI legacy I/O port free is the same as Fusion-MPT driver's and it has been merged into 2.6.30.4. This has already been fixed in e1000 and lpfc. As a result of the above, the driver can handle its device even when there are a huge number of PCI devices being used on the system and no I/O port region assigned to the device. Signed-off-by: Noriyuki Fujii <n-fujii@np.css.fujitsu.com> Acked-by: "Yang, Bo" <Bo.Yang@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/scsi/osd')
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