On Thursday, January 08, 2015 10:33:01 AM Jiang Liu wrote:
> Add translation_offset into the result address for bridge window
> resources to form the master side address.
>
> Currently acpi_dev_resource_{ext_}address_space() are only used for
> devices instead of bridges, so it won't break current users. Later
> it will be used to support PCI host bridge drivers.
>
> Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
> ---
> drivers/acpi/resource.c | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
> index d3aa56674bd4..16d334a1ee25 100644
> --- a/drivers/acpi/resource.c
> +++ b/drivers/acpi/resource.c
> @@ -203,6 +203,20 @@ static bool acpi_decode_space(struct resource *res, resource_size_t *offset,
> res->start = addr->minimum;
> res->end = addr->maximum;
>
> + /*
> + * For bridges that translate addresses across the bridge,
> + * translation_offset is the offset that must be added to the
> + * address on the secondary side to obtain the address on the
> + * primary side. Non-bridge devices must list 0 for all Address
> + * Translation offset bits.
> + */
> + if (base->producer_consumer == ACPI_PRODUCER) {
OK, so the assumption is that this check is never true in the current code, right?
> + res->start += addr->translation_offset;
> + res->end += addr->translation_offset;
> + } else if (addr->translation_offset) {
And won't this break anything even if so?
> + return false;
> + }
> +
> switch(base->resource_type) {
> case ACPI_MEMORY_RANGE:
> acpi_dev_memresource_flags(res, len, wp);
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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