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PCI: Align P2P windows using pcibios_window_alignment()

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This patch changes pbus_size_io() and pbus_size_mem() to do window (I/O,
memory and prefetchable memory) reassignment based on the minimal
alignments for the P2P bridge, which was retrieved by window_alignment().

[bhelgaas: changelog]
Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Gavin Shan 2012-09-11 16:59:46 -06:00 committed by Bjorn Helgaas
parent ac5ad93e92
commit 462d930306
1 changed files with 6 additions and 9 deletions
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15
drivers/pci/setup-bus.c
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@ -749,17 +749,12 @@ 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 min_align = 4096, align;
resource_size_t min_align, io_align, align;
if (!b_res)
return;
/*
* Per spec, I/O windows are 4K-aligned, but some bridges have an
* extension to support 1K alignment.
*/
if (bus->self->io_window_1k)
min_align = 1024;
io_align = min_align = window_alignment(bus, IORESOURCE_IO);
list_for_each_entry(dev, &bus->devices, bus_list) {
int i;
@ -786,8 +781,8 @@ static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size,
}
}
if (min_align > 4096)
min_align = 4096;
if (min_align > io_align)
min_align = io_align;
size0 = calculate_iosize(size, min_size, size1,
resource_size(b_res), min_align);
@ -909,6 +904,8 @@ 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, b_res->flags & mask));
size0 = calculate_memsize(size, min_size, 0, resource_size(b_res), min_align);
if (children_add_size > add_size)
add_size = children_add_size;