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This patch implements two functions ht_create_irq and ht_destroy_irq for use by drivers. Several other functions are implemented as helpers for arch specific irq_chip handlers. The driver for the card I tested this on isn't yet ready to be merged. However this code is and hypertransport irqs are in use in a few other places in the kernel. Not that any of this will get merged before 2.6.19 Because the ipath-ht400 is slightly out of spec this code will need to be generalized to work there. I think all of the powerpc uses are for a plain interrupt controller in a chipset so support for native hypertransport devices is a little less interesting. However I think this is a half way decent model on how to separate arch specific and generic helper code, and I think this is a functional model of how to get the architecture dependencies out of the msi code. [akpm@osdl.org: Kconfig fix] Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Greg KH <greg@kroah.com> Cc: Andi Kleen <ak@muc.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
64 lines
2.1 KiB
Plaintext
64 lines
2.1 KiB
Plaintext
#
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# PCI configuration
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#
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config PCI_MSI
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bool "Message Signaled Interrupts (MSI and MSI-X)"
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depends on PCI
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depends on (X86_LOCAL_APIC && X86_IO_APIC) || IA64
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help
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This allows device drivers to enable MSI (Message Signaled
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Interrupts). Message Signaled Interrupts enable a device to
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generate an interrupt using an inbound Memory Write on its
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PCI bus instead of asserting a device IRQ pin.
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Use of PCI MSI interrupts can be disabled at kernel boot time
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by using the 'pci=nomsi' option. This disables MSI for the
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entire system.
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If you don't know what to do here, say N.
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config PCI_MULTITHREAD_PROBE
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bool "PCI Multi-threaded probe (EXPERIMENTAL)"
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depends on PCI && EXPERIMENTAL
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help
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Say Y here if you want the PCI core to spawn a new thread for
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every PCI device that is probed. This can cause a huge
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speedup in boot times on multiprocessor machines, and even a
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smaller speedup on single processor machines.
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But it can also cause lots of bad things to happen. A number
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of PCI drivers can not properly handle running in this way,
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some will just not work properly at all, while others might
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decide to blow up power supplies with a huge load all at once,
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so use this option at your own risk.
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It is very unwise to use this option if you are not using a
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boot process that can handle devices being created in any
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order. A program that can create persistant block and network
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device names (like udev) is a good idea if you wish to use
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this option.
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Again, use this option at your own risk, you have been warned!
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When in doubt, say N.
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config PCI_DEBUG
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bool "PCI Debugging"
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depends on PCI && DEBUG_KERNEL
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help
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Say Y here if you want the PCI core to produce a bunch of debug
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messages to the system log. Select this if you are having a
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problem with PCI support and want to see more of what is going on.
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When in doubt, say N.
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config HT_IRQ
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bool "Interrupts on hypertransport devices"
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default y
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depends on PCI_MSI
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depends on X86_LOCAL_APIC && X86_IO_APIC
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help
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This allows native hypertransport devices to use interrupts.
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If unsure say Y.
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