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[Qemu-devel] Re: [PATCH] pci: w1cmask[PCI_BRIDGE_CONTROL] initialized in
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] Re: [PATCH] pci: w1cmask[PCI_BRIDGE_CONTROL] initialized incorrectly |
Date: |
Wed, 26 Jan 2011 15:46:01 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
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 <address@hidden>
> >
> > 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