On Fri, Oct 11, 2013 at 08:19:01PM +0800, tianyu.lan@xxxxxxxxx wrote:
> From: Lan Tianyu <tianyu.lan@xxxxxxxxx>
>
> Using ACPI resource functions to convert ACPI resource to generic resource
>
> Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
> ---
> This patch just passes through compilation test due to no ia64 machine on hand.
>
> arch/ia64/pci/pci.c | 38 +++++++++++++++++++++-----------------
> 1 file changed, 21 insertions(+), 17 deletions(-)
>
> diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
> index 2326790..14fa175 100644
> --- a/arch/ia64/pci/pci.c
> +++ b/arch/ia64/pci/pci.c
> @@ -232,8 +232,9 @@ out:
> return ~0;
> }
>
> -static acpi_status resource_to_window(struct acpi_resource *resource,
> - struct acpi_resource_address64 *addr)
> +static acpi_status resource_to_window(struct acpi_resource *ares,
> + struct acpi_resource_address64 *addr,
> + struct resource *res)
> {
> acpi_status status;
>
> @@ -244,7 +245,7 @@ static acpi_status resource_to_window(struct acpi_resource *resource,
> * - producers, i.e., the address space is routed downstream,
> * not consumed by the bridge itself
> */
> - status = acpi_resource_to_address64(resource, addr);
> + status = acpi_dev_resource_address_space_full(ares, addr, res);
> if (ACPI_SUCCESS(status) &&
> (addr->resource_type == ACPI_MEMORY_RANGE ||
> addr->resource_type == ACPI_IO_RANGE) &&
> @@ -255,51 +256,54 @@ static acpi_status resource_to_window(struct acpi_resource *resource,
> return AE_ERROR;
> }
>
> -static acpi_status count_window(struct acpi_resource *resource, void *data)
> +static acpi_status count_window(struct acpi_resource *ares, void *data)
> {
> unsigned int *windows = (unsigned int *) data;
> struct acpi_resource_address64 addr;
> + struct resource res;
> acpi_status status;
>
> - status = resource_to_window(resource, &addr);
> + status = resource_to_window(ares, &addr, &res);
> if (ACPI_SUCCESS(status))
> (*windows)++;
>
> return AE_OK;
> }
>
> -static acpi_status add_window(struct acpi_resource *res, void *data)
> +static acpi_status add_window(struct acpi_resource *ares, void *data)
> {
> struct pci_root_info *info = data;
> - struct resource *resource;
> + struct resource *resource = &info->res[info->res_num];
> struct acpi_resource_address64 addr;
> acpi_status status;
> - unsigned long flags, offset = 0;
> + unsigned long offset = 0;
> struct resource *root;
>
> /* Return AE_OK for non-window resources to keep scanning for more */
> - status = resource_to_window(res, &addr);
> + status = resource_to_window(ares, &addr, resource);
> if (!ACPI_SUCCESS(status))
> return AE_OK;
>
> - if (addr.resource_type == ACPI_MEMORY_RANGE) {
> - flags = IORESOURCE_MEM;
> + if (resource->flags & IORESOURCE_MEM) {
> root = &iomem_resource;
> offset = addr.translation_offset;
> - } else if (addr.resource_type == ACPI_IO_RANGE) {
> - flags = IORESOURCE_IO;
> + } else if (resource->flags & IORESOURCE_IO) {
> root = &ioport_resource;
> offset = add_io_space(info, &addr);
> if (offset == ~0)
> return AE_OK;
> +
> + /*
> + * io space address translation offset depends
> + * on the return value of add_io_space(). So
> + * Repopulate resource->start and end here.
"Repopulate" makes it sound like "resource->start" got clobbered
somewhere. But it didn't. I think it's just that each bridge can
support its own I/O port range, and the PCI port numbers reported
in the acpi_resource may not be distinct, and add_io_space() adds
an offset so all the I/O port ranges fit into one global I/O port
space.
For example, I think these two bridges have the same port numbers
(0x0-0xfff) in their acpi_resource, but the second has an offset
of 0x1000000 in the system I/O port space, and I think this offset
is what add_io_space() returns:
HWP0002:00: host bridge window [io 0x0000-0x0fff] (PCI [0x0-0xfff])
HWP0002:09: host bridge window [io 0x1000000-0x1000fff] (PCI [0x0-0xfff])
> + */
> + resource->start = addr.minimum + offset;
> + resource->end = resource->start + addr.address_length - 1;
Can't we use this:
resource->start += offset;
resource->end += offset;
to avoid breaking the encapsulation of struct acpi_resource_address64?
> } else
> return AE_OK;
>
> - resource = &info->res[info->res_num];
> resource->name = info->name;
> - resource->flags = flags;
> - resource->start = addr.minimum + offset;
> - resource->end = resource->start + addr.address_length - 1;
> info->res_offset[info->res_num] = offset;
>
> if (insert_resource(root, resource)) {
> --
> 1.8.2.1
>
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