lkml.org 
[lkml]   [2014]   [May]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] PCI: quirk RTL8110SC INTx masking
On Thu, May 01, 2014 at 02:36:31PM -0600, Alex Williamson wrote:
> INTx masking does not work on this device. To see this, configure
> the network device UP on an active network, note that the interrupt
> count continues to increment for the device in /proc/interrupts. Use
> setpci to set the PCI_COMMAND_INTX_DISABLE bit in the PCI_COMMAND
> register. As expected, the interrupt count ceases to increment.
> However, reading the PCI_STATUS_INTERRUPT bit of the PCI_STATUS
> register does not indicate that interrupts are pending and clearing
> PCI_COMMAND_INTX_DISABLE in the PCI_COMMAND register does not allow
> the device to continue operation.
>
> This does not affect operation of the host r8169 driver, but it does
> prevent the device from being functional when assigned to a VM, such
> as with QEMU and VFIO. The guest driver successfully probes the
> device, but there is no traffic. Mark INTx masking as broken,
> allowing the more restrictive APIC masking to be used instead.
>
> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

Applied to pci/virtualization for v3.16, thanks.

> ---
> drivers/pci/quirks.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index ea55b0f..e15a5da 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -2991,6 +2991,14 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CHELSIO, 0x0030,
> quirk_broken_intx_masking);
> DECLARE_PCI_FIXUP_HEADER(0x1814, 0x0601, /* Ralink RT2800 802.11n PCI */
> quirk_broken_intx_masking);
> +/*
> + * Realtek RTL8169 PCI Gigabit Ethernet Controller (rev 10)
> + * Subsystem: Realtek RTL8169/8110 Family PCI Gigabit Ethernet NIC
> + *
> + * RTL8110SC - Fails under PCI device assignment using DisINTx masking.
> + */
> +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_REALTEK, 0x8169,
> + quirk_broken_intx_masking);
>
> static void pci_do_fixups(struct pci_dev *dev, struct pci_fixup *f,
> struct pci_fixup *end)
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-pci" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html


\
 
 \ /
  Last update: 2014-05-20 23:41    [W:0.030 / U:0.284 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site