linux-kernel - Re: [PATCH 0/3] x86, MSI: Support multiple MSIs in presense of IRQ remapping

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Date:	Tue, 31 Jul 2012 14:12:49 -0700
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	Alexander Gordeev <agordeev@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Matthew Wilcox <willy@...ux.intel.com>
Subject: Re: [PATCH 0/3] x86, MSI: Support multiple MSIs in presense of IRQ
 remapping

On Tue, 2012-07-31 at 13:41 +0200, Alexander Gordeev wrote:
> Currently multiple MSI mode is limited to a single vector per device (at
> least on x86 and PPC). This series breathes life into pci_enable_msi_block()
> and makes it possible to set interrupt affinity for multiple IRQs, similarly
> to MSI-X. Yet, only for x86 and only when IOMMUs are present.
> 
> Although IRQ and PCI subsystems are modified, the current behaviour left
> intact. The drivers could just start using multiple MSIs just by following
> the existing documentation.

So while I am ok with the proposed changes, I will hold off acking until
I see the corresponding driver changes (using pci_enable_msi_block()
etc) that take advantage of these changes ;)

Did you have a specific device in mind and are the driver changes
coming?

thanks,
suresh

> 
> The patches are adapted to Ingo's -tip repository, x86/apic branch.
> 
> Alexander Gordeev (3):
>   x86, MSI: Support multiple MSIs in presense of IRQ remapping
>   x86, MSI: Allocate as many multiple IRQs as requested
>   x86, MSI: Minor readability fixes
> 
>  arch/x86/kernel/apic/io_apic.c |  170 +++++++++++++++++++++++++++++++++++++---
>  drivers/pci/msi.c              |   10 ++-
>  include/linux/irq.h            |    6 ++
>  include/linux/msi.h            |    1 +
>  kernel/irq/chip.c              |   30 +++++--
>  kernel/irq/irqdesc.c           |   31 +++++++
>  6 files changed, 226 insertions(+), 22 deletions(-)
> 
> -- 
> 1.7.7.6
> 
> 


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