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authorMichael Ellerman <michael@ellerman.id.au>2007-04-18 19:39:21 +1000
committerGreg Kroah-Hartman <gregkh@suse.de>2007-05-02 19:02:38 -0700
commit9c8313343c83c0ca731ceb8d2a4ab1e022ed9c94 (patch)
tree1e37ef3ebcdcb344adb74c1667ad04cf87010f5e /include/linux/msi.h
parent7fe3730de729b758e9f69b862b9255d998671b5f (diff)
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.h1
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);