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Message-ID: <15994211.6fY1r0IKoV@vostro.rjw.lan> Date: Sat, 12 Jan 2013 22:35:55 +0100 From: "Rafael J. Wysocki" <rjw@...k.pl> To: Yinghai Lu <yinghai@...nel.org> Cc: Bjorn Helgaas <bhelgaas@...gle.com>, Len Brown <lenb@...nel.org>, Taku Izumi <izumi.taku@...fujitsu.com>, Jiang Liu <jiang.liu@...wei.com>, linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org Subject: Re: [PATCH v8 01/22] PCI, acpiphp: Add is_hotplug_bridge detection On Friday, January 11, 2013 02:40:28 PM Yinghai Lu wrote: > When system support hotplug bridge with children hotplug slots, we need > to make sure that parent bridge get preallocated resource so later when > device is plugged into children slot, those children devices will get > resource allocated. > > We do not meet this problem, because for pcie hotplug card, when acpiphp > is used, pci_scan_bridge will set that for us when detect hotplug bit in > slot cap. > > Reported-and-tested-by: Jason Baron <jbaron@...hat.com> > Signed-off-by: Yinghai Lu <yinghai@...nel.org> > Acked-by: Jason Baron <jbaron@...hat.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com> > --- > drivers/pci/hotplug/acpiphp_glue.c | 27 ++++++++++++++++++++++++++- > 1 file changed, 26 insertions(+), 1 deletion(-) > > diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c > index 91b5ad8..1e5c5df 100644 > --- a/drivers/pci/hotplug/acpiphp_glue.c > +++ b/drivers/pci/hotplug/acpiphp_glue.c > @@ -797,6 +797,29 @@ static void acpiphp_set_acpi_region(struct acpiphp_slot *slot) > } > } > > +static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev) > +{ > + struct acpiphp_func *func; > + > + if (!dev->subordinate) > + return; > + > + /* quirk, or pcie could set it already */ > + if (dev->is_hotplug_bridge) > + return; > + > + if (PCI_SLOT(dev->devfn) != slot->device) > + return; > + > + list_for_each_entry(func, &slot->funcs, sibling) { > + if (PCI_FUNC(dev->devfn) == func->function) { > + /* check if this bridge has ejectable slots */ > + if ((detect_ejectable_slots(func->handle) > 0)) > + dev->is_hotplug_bridge = 1; > + break; > + } > + } > +} > /** > * enable_device - enable, configure a slot > * @slot: slot to be enabled > @@ -831,8 +854,10 @@ static int __ref enable_device(struct acpiphp_slot *slot) > if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || > dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) { > max = pci_scan_bridge(bus, dev, max, pass); > - if (pass && dev->subordinate) > + if (pass && dev->subordinate) { > + check_hotplug_bridge(slot, dev); > pci_bus_size_bridges(dev->subordinate); > + } > } > } > } > -- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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