From 8c86e70acead629aacb4afcd818add66bf6844d9 Mon Sep 17 00:00:00 2001 From: Vivek Goyal <vgoyal@redhat.com> Date: Fri, 8 Aug 2014 14:25:50 -0700 Subject: resource: provide new functions to walk through resources I have added two more functions to walk through resources. Currently walk_system_ram_range() deals with pfn and /proc/iomem can contain partial pages. By dealing in pfn, callback function loses the info that last page of a memory range is a partial page and not the full page. So I implemented walk_system_ram_res() which returns u64 values to callback functions and now it properly return start and end address. walk_system_ram_range() uses find_next_system_ram() to find the next ram resource. This in turn only travels through siblings of top level child and does not travers through all the nodes of the resoruce tree. I also need another function where I can walk through all the resources, for example figure out where "GART" aperture is. Figure out where ACPI memory is. So I wrote another function walk_iomem_res() which walks through all /proc/iomem resources and returns matches as asked by caller. Caller can specify "name" of resource, start and end and flags. Got rid of find_next_system_ram_res() and instead implemented more generic find_next_iomem_res() which can be used to traverse top level children only based on an argument. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Borislav Petkov <bp@suse.de> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Eric Biederman <ebiederm@xmission.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Matthew Garrett <mjg59@srcf.ucam.org> Cc: Greg Kroah-Hartman <greg@kroah.com> Cc: Dave Young <dyoung@redhat.com> Cc: WANG Chao <chaowang@redhat.com> Cc: Baoquan He <bhe@redhat.com> Cc: Andy Lutomirski <luto@amacapital.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> --- include/linux/ioport.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'include') diff --git a/include/linux/ioport.h b/include/linux/ioport.h index 5e3a906cc089..142ec544167c 100644 --- a/include/linux/ioport.h +++ b/include/linux/ioport.h @@ -237,6 +237,12 @@ extern int iomem_is_exclusive(u64 addr); extern int walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages, void *arg, int (*func)(unsigned long, unsigned long, void *)); +extern int +walk_system_ram_res(u64 start, u64 end, void *arg, + int (*func)(u64, u64, void *)); +extern int +walk_iomem_res(char *name, unsigned long flags, u64 start, u64 end, void *arg, + int (*func)(u64, u64, void *)); /* True if any part of r1 overlaps r2 */ static inline bool resource_overlaps(struct resource *r1, struct resource *r2) -- cgit v1.2.3