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author | Michael Ellerman <michael@ellerman.id.au> | 2007-04-18 19:39:21 +1000 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-05-02 19:02:38 -0700 |
commit | 9c8313343c83c0ca731ceb8d2a4ab1e022ed9c94 (patch) | |
tree | 1e37ef3ebcdcb344adb74c1667ad04cf87010f5e /include/linux/msi.h | |
parent | 7fe3730de729b758e9f69b862b9255d998671b5f (diff) | |
download | linux-stable-9c8313343c83c0ca731ceb8d2a4ab1e022ed9c94.tar.gz linux-stable-9c8313343c83c0ca731ceb8d2a4ab1e022ed9c94.tar.bz2 linux-stable-9c8313343c83c0ca731ceb8d2a4ab1e022ed9c94.zip |
MSI: Give archs the option to allocate all MSI/Xs at once.
This patch introduces an optional function, arch_setup_msi_irqs(),
(note the plural) which gives an arch the opportunity to do per-device
setup for MSI/X and then allocate all the requested MSI/Xs at once.
If that's not required by the arch, the default version simply calls
arch_setup_msi_irq() for each MSI irq required.
arch_setup_msi_irqs() is passed a pdev, attached to the pdev is a list
of msi_descs with irq == 0, it is up to the arch to connect these up to
an irq (via set_irq_msi()) or return an error. For convenience the number
of vectors and the type are passed also.
All msi_descs with irq != 0 are considered allocated, and the arch
teardown routine will be called on them when necessary.
The existing semantics of pci_enable_msix() are that if the requested
number of irqs can not be allocated, the maximum number that _could_ be
allocated is returned. To support that, we define that in case of an
error from arch_setup_msi_irqs(), the number of msi_descs with irq != 0
are considered allocated, and are counted toward the "max that could be
allocated".
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include/linux/msi.h')
-rw-r--r-- | include/linux/msi.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/msi.h b/include/linux/msi.h index 931e013f1db5..494627ae021f 100644 --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -41,6 +41,7 @@ struct msi_desc { */ int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc); void arch_teardown_msi_irq(unsigned int irq); +extern int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type); extern int arch_msi_check_device(struct pci_dev* dev, int nvec, int type); |