diff options
| author | Gavin Shan <shangw@linux.vnet.ibm.com> | 2012-09-12 00:59:46 +0200 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2012-09-12 00:59:46 +0200 |
| commit | 462d93030628a598bc440dcd35c89fb7fc63f58c (patch) | |
| tree | f1e562043b6e141e861aff1d85dda40e9164941e /drivers/pci/setup-bus.c | |
| parent | PCI: Add weak pcibios_window_alignment() interface (diff) | |
| download | linux-462d93030628a598bc440dcd35c89fb7fc63f58c.tar.xz linux-462d93030628a598bc440dcd35c89fb7fc63f58c.zip | |
PCI: Align P2P windows using pcibios_window_alignment()
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>
Diffstat (limited to 'drivers/pci/setup-bus.c')
| -rw-r--r-- | drivers/pci/setup-bus.c | 15 |
1 files changed, 6 insertions, 9 deletions
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index 896f06e3e793..a66cf0905a15 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -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; |