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..ca885ff 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);
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, 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;
--
1.7.5.4
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