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author | Badari Pulavarty <pbadari@us.ibm.com> | 2008-04-18 13:33:53 -0700 |
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committer | Paul Mackerras <paulus@samba.org> | 2008-04-29 15:57:53 +1000 |
commit | 9d88a2eb6e05c07aa0d484b8fa1372722fa921d0 (patch) | |
tree | 782b288099fbd96ed779c033f2c1322ff1822950 /arch/powerpc/mm/mem.c | |
parent | 98d5c21c812e4e3b795f5bd912f407ed7c5e4e38 (diff) | |
download | kernel_samsung_smdk4412-9d88a2eb6e05c07aa0d484b8fa1372722fa921d0.zip kernel_samsung_smdk4412-9d88a2eb6e05c07aa0d484b8fa1372722fa921d0.tar.gz kernel_samsung_smdk4412-9d88a2eb6e05c07aa0d484b8fa1372722fa921d0.tar.bz2 |
[POWERPC] Provide walk_memory_resource() for powerpc
Provide walk_memory_resource() for 64-bit powerpc. PowerPC maintains
logical memory region mapping in the lmb.memory structure. Walk
through these structures and do the callbacks for the contiguous
chunks.
Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>
Cc: Yasunori Goto <y-goto@jp.fujitsu.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/mm/mem.c')
-rw-r--r-- | arch/powerpc/mm/mem.c | 30 |
1 files changed, 23 insertions, 7 deletions
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c index d9e37f3..f67e118 100644 --- a/arch/powerpc/mm/mem.c +++ b/arch/powerpc/mm/mem.c @@ -154,19 +154,35 @@ out: /* * walk_memory_resource() needs to make sure there is no holes in a given - * memory range. On PPC64, since this range comes from /sysfs, the range - * is guaranteed to be valid, non-overlapping and can not contain any - * holes. By the time we get here (memory add or remove), /proc/device-tree - * is updated and correct. Only reason we need to check against device-tree - * would be if we allow user-land to specify a memory range through a - * system call/ioctl etc. instead of doing offline/online through /sysfs. + * memory range. PPC64 does not maintain the memory layout in /proc/iomem. + * Instead it maintains it in lmb.memory structures. Walk through the + * memory regions, find holes and callback for contiguous regions. */ int walk_memory_resource(unsigned long start_pfn, unsigned long nr_pages, void *arg, int (*func)(unsigned long, unsigned long, void *)) { - return (*func)(start_pfn, nr_pages, arg); + struct lmb_property res; + unsigned long pfn, len; + u64 end; + int ret = -1; + + res.base = (u64) start_pfn << PAGE_SHIFT; + res.size = (u64) nr_pages << PAGE_SHIFT; + + end = res.base + res.size - 1; + while ((res.base < end) && (lmb_find(&res) >= 0)) { + pfn = (unsigned long)(res.base >> PAGE_SHIFT); + len = (unsigned long)(res.size >> PAGE_SHIFT); + ret = (*func)(pfn, len, arg); + if (ret) + break; + res.base += (res.size + 1); + res.size = (end - res.base + 1); + } + return ret; } +EXPORT_SYMBOL_GPL(walk_memory_resource); #endif /* CONFIG_MEMORY_HOTPLUG */ |