linux-kernel - Re: [PATCH] pci: change msi-x vector to 32bit

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Date:	Thu, 21 Aug 2008 13:33:00 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	James Bottomley <James.Bottomley@...senpartnership.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Andrew Vasquez <andrew.vasquez@...gic.com>
Subject: Re: [PATCH] pci: change msi-x vector to 32bit

On Friday, August 15, 2008 7:36 pm Yinghai Lu wrote:
> we are using 28bit pci (bus/dev/fn + 12 bits) as irq number, so the
> cache for irq number should be 32 bit too.
>
> Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>
> Cc: Andrew Vasquez <andrew.vasquez@...gic.com>
>
> ---
>  drivers/scsi/qla2xxx/qla_def.h |    2 +-
>  include/linux/pci.h            |    2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
>
> Index: linux-2.6/drivers/scsi/qla2xxx/qla_def.h
> ===================================================================
> --- linux-2.6.orig/drivers/scsi/qla2xxx/qla_def.h
> +++ linux-2.6/drivers/scsi/qla2xxx/qla_def.h
> @@ -2109,7 +2109,7 @@ struct scsi_qla_host;
>
>  struct qla_msix_entry {
>  	int have_irq;
> -	uint16_t msix_vector;
> +	uint32_t msix_vector;
>  	uint16_t msix_entry;
>  };
>
> Index: linux-2.6/include/linux/pci.h
> ===================================================================
> --- linux-2.6.orig/include/linux/pci.h
> +++ linux-2.6/include/linux/pci.h
> @@ -730,7 +730,7 @@ enum pci_dma_burst_strategy {
>  };
>
>  struct msix_entry {
> -	u16 	vector;	/* kernel uses to write allocated vector */
> +	u32	vector;	/* kernel uses to write allocated vector */
>  	u16	entry;	/* driver uses to specify entry, OS writes */
>  };

I see a lot of smoke about this, but not a clear consensus.  It sounds like no 
one objects to making the MSI vector field 32 bits, but there were a lot of 
concerns about IRQ vector naming/numbering in general?  And I assume this 
particular patch isn't 2.6.27 material...

Thanks,
-- 
Jesse Barnes, Intel Open Source Technology Center
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