[Qemu-devel] Re: [PATCH] pci: w1cmask[PCI_BRIDGE_CONTROL] initialized incorrectly

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

On Wed, Jan 26, 2011 at 10:17:48PM +0900, Isaku Yamahata wrote:
> The bit should be writable, not w1c.
> 
> 3.2.5.18 bridge control register
> bit 11 Discard Timer SERR# Enable
> 
>   When set to 1, this bit enables the bridge to assert SERR# on
>   the primary interface when either the Primary Discard Timer or
>   Secondary Discard Timer expires and a Delayed Transaction is
>   discarded from a queue in the bridge. The default state of this
>   bit must be 0 after reset.
>   0 - do not assert SERR# on the primary interface as
>   a result of the expiration of either the Primary
>   Discard Timer or Secondary Discard Timer
>   1 - assert SERR# on the primary interface if either
>   the Primary Discard Timer or Secondary Discard
>   Timer expires and a Delayed Transaction

Yes but
#define  PCI_BRIDGE_CTL_DISCARD_STATUS 0x400   /* Discard timer status */

So this is bit 10?

BTW, how about moving these bits to linux and then to our pci_regs.h?

>S. Tsirkin wrote:
> > On Wed, Jan 26, 2011 at 06:45:27PM +0900, Isaku Yamahata wrote:
> > > pci_init_wmask_bridge() incorrectly set w1cmask[PCI_BRIDGE_CONTROL].
> > > This patch removes the line otherwise the assert(!(wmask & w1cmask)) in
> > > pci_default_write_config() is hit.
> > > 
> > > Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
> > 
> > Maybe clear in wmask? This bit really should be w1c, should it not?
> > 
> > > ---
> > >  hw/pci.c |    4 ----
> > >  1 files changed, 0 insertions(+), 4 deletions(-)
> > > 
> > > diff --git a/hw/pci.c b/hw/pci.c
> > > index b8f5385..79a46e7 100644
> > > --- a/hw/pci.c
> > > +++ b/hw/pci.c
> > > @@ -643,10 +643,6 @@ static void pci_init_wmask_bridge(PCIDevice *d)
> > >                   PCI_BRIDGE_CTL_SEC_DISCARD |
> > >                   PCI_BRIDGE_CTL_DISCARD_STATUS |
> > >                   PCI_BRIDGE_CTL_DISCARD_SERR);
> > > -    /* Below does not do anything as we never set this bit, put here for
> > > -     * completeness. */
> > > -    pci_set_word(d->w1cmask + PCI_BRIDGE_CONTROL,
> > > -                 PCI_BRIDGE_CTL_DISCARD_STATUS);
> > >  }
> > >  
> > >  static int pci_init_multifunction(PCIBus *bus, PCIDevice *dev)
> > > -- 
> > > 1.7.1.1
> > 
> 
> -- 
> yamahata