Anyone knows what's going on?
If no mail should be sent to p...@codesourcery.com,
let's add .mailcap so get_maintainer doesn't suggest this
address.
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Date: Mon, 30 Sep 2013 13:10:35 +0300
From: "Michael S. Tsirkin" <m...@redhat.com>
To: Marcel Apfelbaum <marce...@redhat.com>
Cc: Paolo Bonzini <pbonz...@redhat.com>, "qemu-devel@nongnu.org"
<qemu-devel@nongnu.org>, kra...@redhat.com, p...@codesourcery.com,
anth...@codemonkey.ws, afaer...@suse.de, s...@weilnetz.de,
peter.crosthwa...@xilinx.com, stefa...@redhat.com, jasow...@redhat.com,
dk...@verizon.com, alex.william...@redhat.com
Subject: Re: [Qemu-devel] [PATCH 0/3] hw: set irq without selecting INTx pin
Message-ID: <20130930101035.gb20...@redhat.com>
In-Reply-To: <1380534200.3439.8.camel@localhost.localdomain>
On Mon, Sep 30, 2013 at 12:43:20PM +0300, Marcel Apfelbaum wrote:
> On Mon, 2013-09-30 at 12:14 +0300, Michael S. Tsirkin wrote:
> > On Mon, Sep 30, 2013 at 11:02:06AM +0200, Paolo Bonzini wrote:
> > > Il 30/09/2013 10:58, Michael S. Tsirkin ha scritto:
> > > >>> > > As a next step, can we make pci_set_irq non-inline and make
> > > >>> > > it call pci_irq_handler directly, and get rid of the irq field?
> > > >> > What irq field?
> > > > /* IRQ objects for the INTA-INTD pins. */
> > > > qemu_irq *irq;
> > > >
> > >
> > > That's still used by devices that use common code for PCI and sysbus
> > > versions (e.g. USB OHCI and EHCI).
> > >
> > > Paolo
> >
> > Well this work wouldn't be complete without
> > addressing them anyway.
> >
> > These devices would have to create their own
> > irq in pci-specific code, along the lines of:
>
> This irq field is used also in places where pci_set_irq(PCIDevice dev, level)
> can't infer the INTx:
> - PCIExpress:
> qemu_set_irq(dev->irq[dev->exp.hpev_intx],dev->exp.hpev_notified);
Well the spec says, explicitly:
6.7.3.4.
Software Notification of Hot-Plug Events
...
Note that all other interrupt sources within the same Function will
assert the same virtual INTx wire
when requesting service.
I read this to mean that this is a bug,
and it should simply use pci_set_irq like all other
devices.
> - vmxnet3 device: qemu_set_irq(d->irq[int_idx], 1);
>
> What approach should be used here?
>
> Thanks,
> Marcel
> > - s->irq = dev->irq[3];
> > + s->irq = qemu_allocate_irqs(pci_set_irq, dev, 1);
> >
> >
> > If there's more than one device like this, we should add
> >
> > /* Return an irq that calls pci_set_irq internally */
> > qemu_irq *pci_allocate_irq(PCIDevice *);
> >
>
>
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