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Commit 71b0bfe4 authored by Li Zhong's avatar Li Zhong Committed by Benjamin Herrenschmidt
Browse files

powerpc: implement vmemmap_free() 



vmemmap_free() does the opposite of vmemap_populate().
This patch also puts vmemmap_free() and vmemmap_list_free() into
 CONFIG_MEMMORY_HOTPLUG.

Signed-off-by: default avatarLi Zhong <zhong@linux.vnet.ibm.com>
Cc: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Acked-by: default avatarNathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent ed5694a8

arch/powerpc/mm/init_64.c

+64 −21
Original line number Diff line number Diff line
@@ -298,6 +298,37 @@ static __meminit void vmemmap_list_populate(unsigned long phys, 
	vmemmap_list = vmem_back;

}



int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)

{

	unsigned long page_size = 1 << mmu_psize_defs[mmu_vmemmap_psize].shift;



	/* Align to the page size of the linear mapping. */

	start = _ALIGN_DOWN(start, page_size);



	pr_debug("vmemmap_populate %lx..%lx, node %d\n", start, end, node);



	for (; start < end; start += page_size) {

		void *p;



		if (vmemmap_populated(start, page_size))

			continue;



		p = vmemmap_alloc_block(page_size, node);

		if (!p)

			return -ENOMEM;



		vmemmap_list_populate(__pa(p), start, node);



		pr_debug("      * %016lx..%016lx allocated at %p\n",

			 start, start + page_size, p);



		vmemmap_create_mapping(start, page_size, __pa(p));

	}



	return 0;

}



#ifdef CONFIG_MEMORY_HOTPLUG

static unsigned long vmemmap_list_free(unsigned long start)

{

	struct vmemmap_backing *vmem_back, *vmem_back_prev;
@@ -330,40 +361,52 @@ static unsigned long vmemmap_list_free(unsigned long start) 
	return vmem_back->phys;

}



int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)

void __ref vmemmap_free(unsigned long start, unsigned long end)

{

	unsigned long page_size = 1 << mmu_psize_defs[mmu_vmemmap_psize].shift;



	/* Align to the page size of the linear mapping. */

	start = _ALIGN_DOWN(start, page_size);



	pr_debug("vmemmap_populate %lx..%lx, node %d\n", start, end, node);

	pr_debug("vmemmap_free %lx...%lx\n", start, end);



	for (; start < end; start += page_size) {

		void *p;

		unsigned long addr;



		/*

		 * the section has already be marked as invalid, so

		 * vmemmap_populated() true means some other sections still

		 * in this page, so skip it.

		 */

		if (vmemmap_populated(start, page_size))

			continue;



		p = vmemmap_alloc_block(page_size, node);

		if (!p)

			return -ENOMEM;

		addr = vmemmap_list_free(start);

		if (addr) {

			struct page *page = pfn_to_page(addr >> PAGE_SHIFT);



		vmemmap_list_populate(__pa(p), start, node);



		pr_debug("      * %016lx..%016lx allocated at %p\n",

			 start, start + page_size, p);



		vmemmap_create_mapping(start, page_size, __pa(p));

			if (PageReserved(page)) {

				/* allocated from bootmem */

				if (page_size < PAGE_SIZE) {

					/*

					 * this shouldn't happen, but if it is

					 * the case, leave the memory there

					 */

					WARN_ON_ONCE(1);

				} else {

					unsigned int nr_pages =

						1 << get_order(page_size);

					while (nr_pages--)

						free_reserved_page(page++);

				}

			} else

				free_pages((unsigned long)(__va(addr)),

							get_order(page_size));



	return 0;

			vmemmap_remove_mapping(start, page_size);

		}



void vmemmap_free(unsigned long start, unsigned long end)

{

	}



}

#endif

void register_page_bootmem_memmap(unsigned long section_nr,

				  struct page *start_page, unsigned long size)

{