On Tue, Sep 06, 2011 at 12:16:11PM +0300, Sasha Levin wrote:
> > Back to square #1: We need a device with MSI support and cap bit 8 set
> > in its _MSI_ control word.
>
> Alright, so I've looked at some of my servers, and one of them has both
> a bunch of MSI-X devices, and some MSI devices which show this:
>
> Capabilities: [60] MSI: Enable+ Count=1/2 Maskable+ 64bit-
> Address: 00000020 Data: 0000
> Masking: 00000000 Pending: 00000000
>
> Which would suggest that the support per-vector masking, right?
pciutils has this:
cap = get_conf_word(d, where + PCI_CAP_FLAGS);
later
printf("MSI: Enable%c Count=%d/%d Maskable%c 64bit%c\n",
FLAG(cap, PCI_MSI_FLAGS_ENABLE),
1 << ((cap & PCI_MSI_FLAGS_QSIZE) >> 4),
1 << ((cap & PCI_MSI_FLAGS_QMASK) >> 1),
FLAG(cap, PCI_MSI_FLAGS_MASK_BIT),
FLAG(cap, PCI_MSI_FLAGS_64BIT));
and
#define PCI_MSI_FLAGS_MASK_BIT 0x100 /* interrupt masking & reporting
supported */
#define PCI_CAP_FLAGS 2 /* Capability defined flags (16 bits) */
So yes, that's bit 8 in control word.
> --
>
> Sasha.
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