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| author |   Noriyuki Fujii <n-fujii@np.css.fujitsu.com> | 2009-11-20 16:27:20 +0900 |
|---|---|---|
| committer |   James Bottomley <James.Bottomley@suse.de> | 2009-12-10 08:54:16 -0600 |
| commit | aeab3fd7b865bc4086a80a83cfdd67dded3b41a0 (patch) | |
| tree | 131b4232f1406128464d34c0fbbb12ff66aede01 /include/scsi | |
| parent | [SCSI] Correctly handle thin provisioning write error (diff) | |
| download | linux-dev-aeab3fd7b865bc4086a80a83cfdd67dded3b41a0.tar.xz linux-dev-aeab3fd7b865bc4086a80a83cfdd67dded3b41a0.zip | |
[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 'include/scsi')
0 files changed, 0 insertions, 0 deletions