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PCI: Refactor pbus_size_mem()

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The original idea comes from Ram Pai.  This patch puts the chunk of
code for calculating the minimal alignment of memory window into a
separate inline function.

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 462d930306
commit c121504e89
1 changed files with 23 additions and 13 deletions
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36
drivers/pci/setup-bus.c
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@ -812,6 +812,28 @@ static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size,
}
}
static inline resource_size_t calculate_mem_align(resource_size_t *aligns,
int max_order)
{
resource_size_t align = 0;
resource_size_t min_align = 0;
int order;
for (order = 0; order <= max_order; order++) {
resource_size_t align1 = 1;
align1 <<= (order + 20);
if (!align)
min_align = align1;
else if (ALIGN(align + min_align, min_align) < align1)
min_align = align1 >> 1;
align += aligns[order];
}
return min_align;
}
/**
* pbus_size_mem() - size the memory window of a given bus
*
@ -891,20 +913,8 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
children_add_size += get_res_add_size(realloc_head, r);
}
}
align = 0;
min_align = 0;
for (order = 0; order <= max_order; order++) {
resource_size_t align1 = 1;
align1 <<= (order + 20);
if (!align)
min_align = align1;
else if (ALIGN(align + min_align, min_align) < align1)
min_align = align1 >> 1;
align += aligns[order];
}
min_align = calculate_mem_align(aligns, max_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)