Re: [PATCH 08/10] PCI, parisc: clip firmware assigned resource under parent bridge's

[Helge Deller]

On 12.01.2015 20:23, Yinghai Lu wrote:
> Some bios put range that is not fully coverred by root bus resources.
> Try to clip them and update them in pci bridge bars.
>
> We'd like to fix other arches instead of just x86.
>
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=85491
> Reported-by: Marek Kordik <kordikmarek@xxxxxxxxx>
> Fixes: 5b28541552ef ("PCI: Restrict 64-bit prefetchable bridge windows to 64-bit resources")
> Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
> Cc: "James E.J. Bottomley" <jejb@xxxxxxxxxxxxxxxx>
> Cc: Helge Deller <deller@xxxxxx>
> Cc: linux-parisc@xxxxxxxxxxxxxxx

I tested it on the parisc arch - everything OK.

Acked-by: Helge Deller <deller@xxxxxx>

Thanks!
Helge


> ---
>   drivers/parisc/lba_pci.c | 26 ++++++++++++++++++++++++--
>   1 file changed, 24 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/parisc/lba_pci.c b/drivers/parisc/lba_pci.c
> index 37e71ff..e6ab352 100644
> --- a/drivers/parisc/lba_pci.c
> +++ b/drivers/parisc/lba_pci.c
> @@ -692,11 +692,25 @@ lba_fixup_bus(struct pci_bus *bus)
>   	*/
>   	if (bus->parent) {
>   		int i;
> +		bool changed = false;
> +
> +		dev = bus->self;
>   		/* PCI-PCI Bridge */
>   		pci_read_bridge_bases(bus);
>   		for (i = PCI_BRIDGE_RESOURCES; i < PCI_NUM_RESOURCES; i++) {
> -			pci_claim_resource(bus->self, i);
> +			struct resource *res = &dev->resource[i];
> +
> +			if (pci_claim_resource(dev, i) >= 0)
> +				continue;
> +
> +			if (pci_bus_clip_resource(dev, res)) {
> +				changed = true;
> +				if (pci_claim_resource(dev, i) >= 0)
> +					continue;
> +			}
>   		}
> +		if (changed)
> +			pci_setup_bridge(bus);
>   	} else {
>   		/* Host-PCI Bridge */
>   		int err;
> @@ -776,7 +790,15 @@ lba_fixup_bus(struct pci_bus *bus)
>   			** that share expansion ROMs (think quad tulip), but
>   			** isn't harmful.
>   			*/
> -			pci_claim_resource(dev, i);
> +			if (pci_claim_resource(dev, i) >= 0)
> +				continue;
> +
> +			/* try again with clip */
> +			if (i != PCI_ROM_RESOURCE &&
> +			    pci_bus_clip_resource(dev, res)) {
> +				pci_update_resource(dev, i);
> +				pci_claim_resource(dev, i);
> +			}
>   		}
>
>   #ifdef FBB_SUPPORT

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