x86, memblock: Add memblock_x86_register_active_regions() and memblock_x86_hole_size()
memblock_x86_register_active_regions() will be used to fill early_node_map, the result will be memblock.memory.region AND numa data memblock_x86_hole_size will be used to find hole size on memblock.memory.region with specified range. Signed-off-by: Yinghai Lu <yinghai@kernel.org> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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@ -11,4 +11,8 @@ void memblock_x86_free_range(u64 start, u64 end);
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struct range;
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int get_free_all_memory_range(struct range **rangep, int nodeid);
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void memblock_x86_register_active_regions(int nid, unsigned long start_pfn,
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unsigned long last_pfn);
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u64 memblock_x86_hole_size(u64 start, u64 end);
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#endif
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@ -232,3 +232,69 @@ void __init memblock_x86_free_range(u64 start, u64 end)
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memblock_free(start, end - start);
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}
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/*
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* Finds an active region in the address range from start_pfn to last_pfn and
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* returns its range in ei_startpfn and ei_endpfn for the memblock entry.
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*/
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static int __init memblock_x86_find_active_region(const struct memblock_region *ei,
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unsigned long start_pfn,
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unsigned long last_pfn,
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unsigned long *ei_startpfn,
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unsigned long *ei_endpfn)
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{
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u64 align = PAGE_SIZE;
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*ei_startpfn = round_up(ei->base, align) >> PAGE_SHIFT;
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*ei_endpfn = round_down(ei->base + ei->size, align) >> PAGE_SHIFT;
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/* Skip map entries smaller than a page */
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if (*ei_startpfn >= *ei_endpfn)
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return 0;
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/* Skip if map is outside the node */
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if (*ei_endpfn <= start_pfn || *ei_startpfn >= last_pfn)
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return 0;
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/* Check for overlaps */
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if (*ei_startpfn < start_pfn)
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*ei_startpfn = start_pfn;
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if (*ei_endpfn > last_pfn)
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*ei_endpfn = last_pfn;
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return 1;
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}
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/* Walk the memblock.memory map and register active regions within a node */
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void __init memblock_x86_register_active_regions(int nid, unsigned long start_pfn,
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unsigned long last_pfn)
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{
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unsigned long ei_startpfn;
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unsigned long ei_endpfn;
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struct memblock_region *r;
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for_each_memblock(memory, r)
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if (memblock_x86_find_active_region(r, start_pfn, last_pfn,
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&ei_startpfn, &ei_endpfn))
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add_active_range(nid, ei_startpfn, ei_endpfn);
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}
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/*
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* Find the hole size (in bytes) in the memory range.
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* @start: starting address of the memory range to scan
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* @end: ending address of the memory range to scan
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*/
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u64 __init memblock_x86_hole_size(u64 start, u64 end)
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{
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unsigned long start_pfn = start >> PAGE_SHIFT;
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unsigned long last_pfn = end >> PAGE_SHIFT;
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unsigned long ei_startpfn, ei_endpfn, ram = 0;
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struct memblock_region *r;
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for_each_memblock(memory, r)
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if (memblock_x86_find_active_region(r, start_pfn, last_pfn,
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&ei_startpfn, &ei_endpfn))
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ram += ei_endpfn - ei_startpfn;
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return end - start - ((u64)ram << PAGE_SHIFT);
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}
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