On Tue, Jul 17, 2012 at 10:23:17AM +0800, Gavin Shan wrote:
> The patch changes function pbus_size_io() and pbus_size_mem() to
> do resource (I/O, memory and prefetchable memory) reassignment
> based on the minimal alignments for the p2p bridge, which was
> retrieved by function window_alignment().
>
> Signed-off-by: Gavin Shan <shangw@xxxxxxxxxxxxxxxxxx>
> ---
> drivers/pci/setup-bus.c | 13 +++++++++----
> 1 files changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
> index c0fb9da..a29483a 100644
> --- a/drivers/pci/setup-bus.c
> +++ b/drivers/pci/setup-bus.c
> @@ -731,6 +731,7 @@ static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size,
> struct resource *b_res = find_free_bus_resource(bus, IORESOURCE_IO);
> unsigned long size = 0, size0 = 0, size1 = 0;
> resource_size_t children_add_size = 0;
> + resource_size_t io_align;
>
> if (!b_res)
> return;
> @@ -756,13 +757,15 @@ static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size,
> children_add_size += get_res_add_size(realloc_head, r);
> }
> }
> +
> + io_align = window_alignment(bus, IORESOURCE_IO);
this should also be
io_align = max(4096, window_alignment(bus, IORESOURCE_IO));
right?
> size0 = calculate_iosize(size, min_size, size1,
> - resource_size(b_res), 4096);
> + resource_size(b_res), io_align);
> if (children_add_size > add_size)
> add_size = children_add_size;
> size1 = (!realloc_head || (realloc_head && !add_size)) ? size0 :
> calculate_iosize(size, min_size, add_size + size1,
> - resource_size(b_res), 4096);
> + resource_size(b_res), io_align);
> if (!size0 && !size1) {
> if (b_res->start || b_res->end)
> dev_info(&bus->self->dev, "disabling bridge window "
> @@ -772,11 +775,11 @@ static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size,
> return;
> }
> /* Alignment of the IO window is always 4K */
> - b_res->start = 4096;
> + b_res->start = io_align;
> b_res->end = b_res->start + size0 - 1;
> b_res->flags |= IORESOURCE_STARTALIGN;
> if (size1 > size0 && realloc_head) {
> - add_to_list(realloc_head, bus->self, b_res, size1-size0, 4096);
> + add_to_list(realloc_head, bus->self, b_res, size1-size0, io_align);
> dev_printk(KERN_DEBUG, &bus->self->dev, "bridge window "
> "%pR to [bus %02x-%02x] add_size %lx\n", b_res,
> bus->secondary, bus->subordinate, size1-size0);
> @@ -875,6 +878,8 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
> min_align = align1 >> 1;
> align += aligns[order];
> }
> +
> + min_align = max(min_align, window_alignment(bus, type));
'type' can sometimes be (IORESOURCE_MEM | IORESOURCE_PREFETCH), which
can lead to unpredictable results depending on how window_alignment()
is implemented... Hence to be on the safer side I suggest
min_align = max(min_align, window_alignment(bus, b_res->flags & mask));
RP
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