(2010/11/04 15:15), Sheng Yang wrote:
> Then we can use it instead of magic number 1.
>
> Cc: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
> Cc: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
> Cc: linux-pci@xxxxxxxxxxxxxxx
> Signed-off-by: Sheng Yang <sheng@xxxxxxxxxxxxxxx>
> ---
> drivers/pci/msi.c | 4 ++--
> include/linux/pci_regs.h | 1 +
> 2 files changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
> index 69b7be3..673e7dc 100644
> --- a/drivers/pci/msi.c
> +++ b/drivers/pci/msi.c
> @@ -158,7 +158,7 @@ static u32 __msix_mask_irq(struct msi_desc *desc, u32 flag)
> u32 mask_bits = desc->masked;
> unsigned offset = desc->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE +
> PCI_MSIX_ENTRY_VECTOR_CTRL;
> - mask_bits &= ~1;
> + mask_bits &= ~PCI_MSIX_ENTRY_CTRL_MASKBIT;
> mask_bits |= flag;
> writel(mask_bits, desc->mask_base + offset);
>
> @@ -185,7 +185,7 @@ static void msi_set_mask_bit(unsigned irq, u32 flag)
>
> void mask_msi_irq(unsigned int irq)
> {
> - msi_set_mask_bit(irq, 1);
> + msi_set_mask_bit(irq, PCI_MSIX_ENTRY_CTRL_MASKBIT);
> }
>
> void unmask_msi_irq(unsigned int irq)
This hunk is not good, because the function msi_set_mask_bit() is
not only for MSI-X but also for MSI, so the number 0/1 here works
as like as false/true:
static void msi_set_mask_bit(struct irq_data *data, u32 flag)
{
struct msi_desc *desc = irq_data_get_msi(data);
if (desc->msi_attrib.is_msix) {
msix_mask_irq(desc, flag);
readl(desc->mask_base); /* Flush write to device */
} else {
unsigned offset = data->irq - desc->dev->irq;
msi_mask_irq(desc, 1 << offset, flag << offset);
}
}
> diff --git a/include/linux/pci_regs.h b/include/linux/pci_regs.h
> index acfc224..ff51632 100644
> --- a/include/linux/pci_regs.h
> +++ b/include/linux/pci_regs.h
> @@ -313,6 +313,7 @@
> #define PCI_MSIX_ENTRY_UPPER_ADDR 4
> #define PCI_MSIX_ENTRY_DATA 8
> #define PCI_MSIX_ENTRY_VECTOR_CTRL 12
> +#define PCI_MSIX_ENTRY_CTRL_MASKBIT 1
>
> /* CompactPCI Hotswap Register */
>
So I recommend you to have a patch with the above hunk for header
plus a change like:
- mask_bits &= ~1;
- mask_bits |= flag;
+ mask_bits &= ~PCI_MSIX_ENTRY_CTRL_MASKBIT;
+ mask_bits |= PCI_MSIX_ENTRY_CTRL_MASKBIT & !!flag;
Anyway thank you very much for doing this work.
Reviewed-by: Hidetoshi Seto <seto.hidetoshi@xxxxxxxxxxxxxx>
Thanks,
H.Seto
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
