Re: [Qemu-devel] [PATCH v2 9/9] msi: Move PCI_MSI_PENDING_32/64 into pci_regs.h

["Michael S. Tsirkin" <mst@redhat.com>]

On Wed, Jun 08, 2011 at 11:03:43PM +0200, Jan Kiszka wrote:
> On 2011-06-08 23:01, Michael S. Tsirkin wrote:
> > On Wed, Jun 08, 2011 at 10:57:13PM +0200, Jan Kiszka wrote:
> >> On 2011-06-08 22:56, Michael S. Tsirkin wrote:
> >>> On Wed, Jun 08, 2011 at 10:44:58PM +0200, Jan Kiszka wrote:
> >>>> On 2011-06-08 21:48, Michael S. Tsirkin wrote:
> >>>>> On Wed, Jun 08, 2011 at 06:21:52PM +0200, Jan Kiszka wrote:
> >>>>>> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
> >>>>>
> >>>>> pci_regs.h from linux does not have these
> >>>>> this is why we keep them in msi.c
> >>>>>
> >>>>> [mst@tuck linux-2.6]$ grep PCI_MSI_ include/linux/pci_regs.h 
> >>>>> #define PCI_MSI_FLAGS           2       /* Various flags */
> >>>>> #define  PCI_MSI_FLAGS_64BIT    0x80    /* 64-bit addresses allowed */
> >>>>> #define  PCI_MSI_FLAGS_QSIZE    0x70    /* Message queue size configured
> >>>>> */
> >>>>> #define  PCI_MSI_FLAGS_QMASK    0x0e    /* Maximum queue size available
> >>>>> */
> >>>>> #define  PCI_MSI_FLAGS_ENABLE   0x01    /* MSI feature enabled */
> >>>>> #define  PCI_MSI_FLAGS_MASKBIT  0x100   /* 64-bit mask bits allowed */
> >>>>> #define PCI_MSI_RFU             3       /* Rest of capability flags */
> >>>>> #define PCI_MSI_ADDRESS_LO      4       /* Lower 32 bits */
> >>>>> #define PCI_MSI_ADDRESS_HI      8       /* Upper 32 bits (if
> >>>>> PCI_MSI_FLAGS_64BIT set) */
> >>>>> #define PCI_MSI_DATA_32         8       /* 16 bits of data for 32-bit
> >>>>> devices */
> >>>>> #define PCI_MSI_MASK_32         12      /* Mask bits register for 32-bit
> >>>>> devices */
> >>>>> #define PCI_MSI_DATA_64         12      /* 16 bits of data for 64-bit
> >>>>> devices */
> >>>>> #define PCI_MSI_MASK_64         16      /* Mask bits register for 64-bit
> >>>>> devices */
> >>>>>
> >>>>>
> >>>>> If you want to move them, please send them upstream we'll merge when
> >>>>> they are there.
> >>>>
> >>>> In fact, both defines are already in libpci. Since 3.0.0. Released 5
> >>>> years ago. OK, I'll send a header resync patch against a more recent
> >>>> release.
> >>>>
> >>>> Then we should just lack something like PCI_MSIX_CTRL. I will have a look.
> >>>
> >>> PCI_MSIX_FLAGS is the same.
> >>
> >> That does not exist in libpci's header.
> >>
> >> Jan
> >>
> > 
> > The upstream I meant is pci_Regs.h in Linux.
> > 
> 
> Why not sync against
> git://git.kernel.org/pub/scm/utils/pciutils/pciutils.git? Sounds more
> appropriate.
> 
> Jan
> 

We are 100% aligned with Linux changing that seems pointless.
I think Linux gets new hardware features faster and has a better
chance to be correct.
We already pull headers from Linux so that's one dependency less.

-- 
MST