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Date: Mon, 9 Dec 2013 10:52:15 -0700
From: Bjorn Helgaas <bhelgaas@...gle.com>
To: Yinghai Lu <yinghai@...nel.org>
Cc: Joseph Salisbury <joseph.salisbury@...onical.com>,
"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH 1/2] PCI: pcibus address to resource converting take bus
instead of dev
On Sun, Dec 8, 2013 at 4:54 PM, Yinghai Lu <yinghai@...nel.org> wrote:
> For allocating resource under bus path, we do not have dev to pass along,
> and we only have bus to use instead.
>
> -v2: drop pcibios_bus_addr_to_resource().
>
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> Cc: stable@...r.kernel.org
> ---
> drivers/pci/host-bridge.c | 34 +++++++++++++++++++++-------------
> include/linux/pci.h | 5 +++++
> 2 files changed, 26 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/pci/host-bridge.c b/drivers/pci/host-bridge.c
> index a68dc61..c988a30 100644
> --- a/drivers/pci/host-bridge.c
> +++ b/drivers/pci/host-bridge.c
> @@ -9,22 +9,19 @@
>
> #include "pci.h"
>
> -static struct pci_bus *find_pci_root_bus(struct pci_dev *dev)
> +static struct pci_bus *find_pci_root_bus(struct pci_bus *bus)
> {
> - struct pci_bus *bus;
> -
> - bus = dev->bus;
> while (bus->parent)
> bus = bus->parent;
>
> return bus;
> }
>
> -static struct pci_host_bridge *find_pci_host_bridge(struct pci_dev *dev)
> +static struct pci_host_bridge *find_pci_host_bridge(struct pci_bus *bus)
> {
> - struct pci_bus *bus = find_pci_root_bus(dev);
> + struct pci_bus *root_bus = find_pci_root_bus(bus);
>
> - return to_pci_host_bridge(bus->bridge);
> + return to_pci_host_bridge(root_bus->bridge);
> }
>
> void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
> @@ -40,10 +37,11 @@ static bool resource_contains(struct resource *res1, struct resource *res2)
> return res1->start <= res2->start && res1->end >= res2->end;
> }
>
> -void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
> - struct resource *res)
> +void __pcibios_resource_to_bus(struct pci_bus *bus,
> + struct pci_bus_region *region,
> + struct resource *res)
> {
> - struct pci_host_bridge *bridge = find_pci_host_bridge(dev);
> + struct pci_host_bridge *bridge = find_pci_host_bridge(bus);
> struct pci_host_bridge_window *window;
> resource_size_t offset = 0;
>
> @@ -60,6 +58,11 @@ void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
> region->start = res->start - offset;
> region->end = res->end - offset;
> }
> +void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
> + struct resource *res)
> +{
> + __pcibios_resource_to_bus(dev->bus, region, res);
> +}
> EXPORT_SYMBOL(pcibios_resource_to_bus);
>
> static bool region_contains(struct pci_bus_region *region1,
> @@ -68,10 +71,10 @@ static bool region_contains(struct pci_bus_region *region1,
> return region1->start <= region2->start && region1->end >= region2->end;
> }
>
> -void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
> - struct pci_bus_region *region)
> +void __pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res,
> + struct pci_bus_region *region)
> {
> - struct pci_host_bridge *bridge = find_pci_host_bridge(dev);
> + struct pci_host_bridge *bridge = find_pci_host_bridge(bus);
> struct pci_host_bridge_window *window;
> resource_size_t offset = 0;
>
> @@ -93,4 +96,9 @@ void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
> res->start = region->start + offset;
> res->end = region->end + offset;
> }
> +void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
> + struct pci_bus_region *region)
> +{
> + __pcibios_bus_to_resource(dev->bus, res, region);
> +}
> EXPORT_SYMBOL(pcibios_bus_to_resource);
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 1084a15..5c2cf8e 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -737,8 +737,13 @@ void pci_fixup_cardbus(struct pci_bus *);
>
> /* Generic PCI functions used internally */
>
> +void __pcibios_resource_to_bus(struct pci_bus *bus,
> + struct pci_bus_region *region,
> + struct resource *res);
> void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
> struct resource *res);
> +void __pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res,
> + struct pci_bus_region *region);
> void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
> struct pci_bus_region *region);
> void pcibios_scan_specific_bus(int busn);
Ugh. Why would we add new functions with "__" prefixes? There are
only a handful of callers to pcibios_bus_to_resource() and
pcibios_resource_to_bus(). We can just change them to supply a
"struct pci_bus *" directly. That's a better match for how the
hardware works anyway.
Bjorn
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