From 884525655d07fdee9245716b998ecdc45cdd8007 Mon Sep 17 00:00:00 2001 From: Ivan Kokshaysky Date: Sun, 30 Mar 2008 19:50:14 +0400 Subject: 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 Cc: Linus Torvalds Cc: Gary Hade Signed-off-by: Greg Kroah-Hartman --- include/linux/ioport.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'include/linux') diff --git a/include/linux/ioport.h b/include/linux/ioport.h index 605d237364d..d5d40a9f792 100644 --- a/include/linux/ioport.h +++ b/include/linux/ioport.h @@ -44,7 +44,9 @@ struct resource_list { #define IORESOURCE_CACHEABLE 0x00004000 #define IORESOURCE_RANGELENGTH 0x00008000 #define IORESOURCE_SHADOWABLE 0x00010000 -#define IORESOURCE_BUS_HAS_VGA 0x00080000 + +#define IORESOURCE_SIZEALIGN 0x00020000 /* size indicates alignment */ +#define IORESOURCE_STARTALIGN 0x00040000 /* start field is alignment */ #define IORESOURCE_DISABLED 0x10000000 #define IORESOURCE_UNSET 0x20000000 @@ -110,6 +112,7 @@ extern int allocate_resource(struct resource *root, struct resource *new, void *alignf_data); int adjust_resource(struct resource *res, resource_size_t start, resource_size_t size); +resource_size_t resource_alignment(struct resource *res); /* Convenience shorthand with allocation */ #define request_region(start,n,name) __request_region(&ioport_resource, (start), (n), (name)) -- cgit v1.2.3