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Re: [Qemu-devel] [PATCH v2 06/11] pci: add a is_valid_func callback to c
From: |
Alex Williamson |
Subject: |
Re: [Qemu-devel] [PATCH v2 06/11] pci: add a is_valid_func callback to check device if complete |
Date: |
Wed, 9 Mar 2016 09:50:31 -0700 |
On Wed, 9 Mar 2016 18:22:24 +0200
"Michael S. Tsirkin" <address@hidden> wrote:
> On Mon, Mar 07, 2016 at 11:22:59AM +0800, Cao jin wrote:
> > From: Chen Fan <address@hidden>
> >
> > Signed-off-by: Chen Fan <address@hidden>
>
> So if you create a mess, you discover it when
> you later add function 0.
> Why not call this when function is added?
> O(N^2) on # of functions, but that # is up to 256 so maybe
> that is not too bad.
Because the configuration isn't valid until the slot is closed. Take a
dual port NIC example again, after we add the first function, the
configuration is invalid because we have an AER indicated device that
can't do a bus reset because the second function, which may be in a
separate IOMMU group, hasn't been added yet. Therefore we can only
check the configuration when the slot is complete. Thanks,
Alex
> > ---
> > hw/pci/pci.c | 39 +++++++++++++++++++++++++++++++++++++++
> > include/hw/pci/pci.h | 1 +
> > 2 files changed, 40 insertions(+)
> >
> > diff --git a/hw/pci/pci.c b/hw/pci/pci.c
> > index d940f79..72650c5 100644
> > --- a/hw/pci/pci.c
> > +++ b/hw/pci/pci.c
> > @@ -1836,6 +1836,31 @@ PCIDevice *pci_find_device(PCIBus *bus, int bus_num,
> > uint8_t devfn)
> > return bus->devices[devfn];
> > }
> >
> > +static void pci_bus_check_device(PCIDevice *pdev, Error **errp)
> > +{
> > + PCIBus *bus = pdev->bus;
> > + PCIDeviceClass *pc;
> > + int i;
> > + Error *local_err = NULL;
> > +
> > + for (i = 0; i < ARRAY_SIZE(bus->devices); ++i) {
> > + if (!bus->devices[i]) {
> > + continue;
> > + }
> > +
> > + pc = PCI_DEVICE_GET_CLASS(bus->devices[i]);
> > + if (!pc->is_valid_func) {
> > + continue;
> > + }
> > +
> > + pc->is_valid_func(bus->devices[i], &local_err);
> > + if (local_err) {
> > + error_propagate(errp, local_err);
> > + return;
> > + }
> > + }
> > +}
> > +
> > static void pci_qdev_realize(DeviceState *qdev, Error **errp)
> > {
> > PCIDevice *pci_dev = (PCIDevice *)qdev;
> > @@ -1878,6 +1903,20 @@ static void pci_qdev_realize(DeviceState *qdev,
> > Error **errp)
> > pci_qdev_unrealize(DEVICE(pci_dev), NULL);
> > return;
> > }
> > +
> > + /*
> > + * If the function is func 0, indicate the closure of the slot.
> > + * then we get the chance to check all functions on same device
> > + * if valid.
> > + */
> > + if (pci_get_function_0(pci_dev) == pci_dev) {
> > + pci_bus_check_device(pci_dev, &local_err);
> > + if (local_err) {
> > + error_propagate(errp, local_err);
> > + pci_qdev_unrealize(DEVICE(pci_dev), NULL);
> > + return;
> > + }
> > + }
> > }
> >
> > static void pci_default_realize(PCIDevice *dev, Error **errp)
> > diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
> > index dedf277..4e56256 100644
> > --- a/include/hw/pci/pci.h
> > +++ b/include/hw/pci/pci.h
> > @@ -191,6 +191,7 @@ typedef struct PCIDeviceClass {
> >
> > void (*realize)(PCIDevice *dev, Error **errp);
> > int (*init)(PCIDevice *dev);/* TODO convert to realize() and remove */
> > + void (*is_valid_func)(PCIDevice *dev, Error **errp);
> > PCIUnregisterFunc *exit;
> > PCIConfigReadFunc *config_read;
> > PCIConfigWriteFunc *config_write;
> > --
> > 1.9.3
> >
> >
[Qemu-devel] [PATCH v2 08/11] pci: introduce pci bus pre reset, Cao jin, 2016/03/06
[Qemu-devel] [PATCH v2 11/11] vfio: add 'aer' property to expose aercap, Cao jin, 2016/03/06
[Qemu-devel] [PATCH v2 09/11] vfio: vote a device to do host bus reset, Cao jin, 2016/03/06
Re: [Qemu-devel] [PATCH v2 09/11] vfio: vote a device to do host bus reset, Michael S. Tsirkin, 2016/03/09