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authorIvan Kokshaysky <ink@jurassic.park.msu.ru>2008-03-30 19:50:14 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2008-04-20 21:47:08 -0700
commit884525655d07fdee9245716b998ecdc45cdd8007 (patch)
tree975cbf2b5079430240d3496323df1a266be95d27 /drivers/pci/setup-res.c
parentd75b305295c38ba9610ff3b2200f7d1989dc55fd (diff)
downloadop-kernel-dev-884525655d07fdee9245716b998ecdc45cdd8007.zip
op-kernel-dev-884525655d07fdee9245716b998ecdc45cdd8007.tar.gz
PCI: clean up resource alignment management
Done per Linus' request and suggestions. Linus has explained that better than I'll be able to explain: On Thu, Mar 27, 2008 at 10:12:10AM -0700, Linus Torvalds wrote: > Actually, before we go any further, there might be a less intrusive > alternative: add just a couple of flags to the resource flags field (we > still have something like 8 unused bits on 32-bit), and use those to > implement a generic "resource_alignment()" routine. > > Two flags would do it: > > - IORESOURCE_SIZEALIGN: size indicates alignment (regular PCI device > resources) > > - IORESOURCE_STARTALIGN: start field is alignment (PCI bus resources > during probing) > > and then the case of both flags zero (or both bits set) would actually be > "invalid", and we would also clear the IORESOURCE_STARTALIGN flag when we > actually allocate the resource (so that we don't use the "start" field as > alignment incorrectly when it no longer indicates alignment). > > That wouldn't be totally generic, but it would have the nice property of > automatically at least add sanity checking for that whole "res->start has > the odd meaning of 'alignment' during probing" and remove the need for a > new field, and it would allow us to have a generic "resource_alignment()" > routine that just gets a resource pointer. Besides, I removed IORESOURCE_BUS_HAS_VGA flag which was unused for ages. Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Gary Hade <garyhade@us.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/pci/setup-res.c')
-rw-r--r--drivers/pci/setup-res.c42
1 files changed, 23 insertions, 19 deletions
diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index bad509e..7d35cdf 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -137,10 +137,16 @@ int pci_assign_resource(struct pci_dev *dev, int resno)
size = res->end - res->start + 1;
min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
- /* The bridge resources are special, as their
- size != alignment. Sizing routines return
- required alignment in the "start" field. */
- align = (resno < PCI_BRIDGE_RESOURCES) ? size : res->start;
+
+ align = resource_alignment(res);
+ if (!align) {
+ printk(KERN_ERR "PCI: Cannot allocate resource (bogus "
+ "alignment) %d [%llx:%llx] (flags %lx) of %s\n",
+ resno, (unsigned long long)res->start,
+ (unsigned long long)res->end, res->flags,
+ pci_name(dev));
+ return -EINVAL;
+ }
/* First, try exact prefetching match.. */
ret = pci_bus_alloc_resource(bus, res, size, align, min,
@@ -164,8 +170,10 @@ int pci_assign_resource(struct pci_dev *dev, int resno)
res->flags & IORESOURCE_IO ? "I/O" : "mem",
resno, (unsigned long long)size,
(unsigned long long)res->start, pci_name(dev));
- } else if (resno < PCI_BRIDGE_RESOURCES) {
- pci_update_resource(dev, res, resno);
+ } else {
+ res->flags &= ~IORESOURCE_STARTALIGN;
+ if (resno < PCI_BRIDGE_RESOURCES)
+ pci_update_resource(dev, res, resno);
}
return ret;
@@ -226,29 +234,25 @@ void pdev_sort_resources(struct pci_dev *dev, struct resource_list *head)
if (r->flags & IORESOURCE_PCI_FIXED)
continue;
- r_align = r->end - r->start;
-
if (!(r->flags) || r->parent)
continue;
+
+ r_align = resource_alignment(r);
if (!r_align) {
- printk(KERN_WARNING "PCI: Ignore bogus resource %d "
- "[%llx:%llx] of %s\n",
+ printk(KERN_WARNING "PCI: bogus alignment of resource "
+ "%d [%llx:%llx] (flags %lx) of %s\n",
i, (unsigned long long)r->start,
- (unsigned long long)r->end, pci_name(dev));
+ (unsigned long long)r->end, r->flags,
+ pci_name(dev));
continue;
}
- r_align = (i < PCI_BRIDGE_RESOURCES) ? r_align + 1 : r->start;
for (list = head; ; list = list->next) {
resource_size_t align = 0;
struct resource_list *ln = list->next;
- int idx;
- if (ln) {
- idx = ln->res - &ln->dev->resource[0];
- align = (idx < PCI_BRIDGE_RESOURCES) ?
- ln->res->end - ln->res->start + 1 :
- ln->res->start;
- }
+ if (ln)
+ align = resource_alignment(ln->res);
+
if (r_align > align) {
tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
if (!tmp)
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