Re: [PATCH 6/6] x86-64: Support for multiple MSIs

[Ingo Molnar <mingo@elte.hu>]

* Matthew Wilcox <matthew@wil.cx> wrote:

> Add support for allocating an aligned block of interrupt vectors. 
> Allow interrupts to have up to 32 subchannels. Implement the 
> arch_setup_msi_irqs() and arch_teardown_msi_irqs() interfaces.
> 
> Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
> ---
>  arch/x86/kernel/io_apic_64.c |  221 +++++++++++++++++++++++++++++++++++------
>  arch/x86/kernel/irq_64.c     |    2 +-
>  include/asm-x86/irq_64.h     |    2 +
>  3 files changed, 191 insertions(+), 34 deletions(-)

hm, please implement this symmetrically on 64-bit and 32-bit as well. 
That will need more IRQ infrastructure changes but that should be OK as 
it will reduce the gap between the 32-bit and 64-bit side instead of 
widening it. A good starting point would be to unify/generalize the IRQ 
vector allocators. (and that would get most of what you need for 
multi-vector MSI)

	Ingo