From: Michael Ellerman Date: Wed, 18 Apr 2007 09:39:21 +0000 (+1000) Subject: MSI: Give archs the option to allocate all MSI/Xs at once. X-Git-Tag: v2.6.22-rc1~1039^2~27 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9c8313343c83c0ca731ceb8d2a4ab1e022ed9c94;p=pandora-kernel.git 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 Signed-off-by: Greg Kroah-Hartman --- Reading git-diff-tree failed