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| author | Roland Dreier <roland@digitalvampire.org> | 2008-09-22 14:55:24 -0700 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2008-10-20 10:54:24 -0700 |
| commit | 50cbfa511a21cac1909b6b4c955fa39d1da81457 (patch) | |
| tree | 80e7bec3fd285d2f118c63942fae34220a89356d /Documentation | |
| parent | ec84f1268fcf16c4a852fdb38b3a541748644918 (diff) | |
| download | linux-50cbfa511a21cac1909b6b4c955fa39d1da81457.tar.gz linux-50cbfa511a21cac1909b6b4c955fa39d1da81457.tar.xz | |
PCI: fix MSI-HOWTO.txt info about MSI-X MMIO space
The current MSI-HOWTO.txt says that device drivers should not request the
memory space that contains MSI-X tables. This is because the original
MSI-X implementation did a request_mem_region() on this space, but that
code was removed long ago (in the pre-git era, in fact). Years after the
code was changed, we might as well clean up the documention to avoid a
confusing mention of requesting regions: drivers using MSI-X can just use
pci_request_regions() just like any other driver, and so there's no need
for MSI-HOWTO.txt to talk about this at all.
Signed-off-by: Roland Dreier <roland@digitalvampire.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/MSI-HOWTO.txt | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/Documentation/MSI-HOWTO.txt b/Documentation/MSI-HOWTO.txt index a51f693c1541..256defd7e174 100644 --- a/Documentation/MSI-HOWTO.txt +++ b/Documentation/MSI-HOWTO.txt @@ -236,10 +236,8 @@ software system can set different pages for controlling accesses to the MSI-X structure. The implementation of MSI support requires the PCI subsystem, not a device driver, to maintain full control of the MSI-X table/MSI-X PBA (Pending Bit Array) and MMIO address space of the MSI-X -table/MSI-X PBA. A device driver is prohibited from requesting the MMIO -address space of the MSI-X table/MSI-X PBA. Otherwise, the PCI subsystem -will fail enabling MSI-X on its hardware device when it calls the function -pci_enable_msix(). +table/MSI-X PBA. A device driver should not access the MMIO address +space of the MSI-X table/MSI-X PBA. 5.3.2 API pci_enable_msix |