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

Jesse Barnes
2008-08-21T20:33:30Z

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@gmail.com>
> Cc: Andrew Vasquez <andrew.vasquez@qlogic.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