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powerpc: implement vmemmap_free()

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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: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Acked-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Li Zhong 2014-06-11 16:23:38 +08:00 committed by Benjamin Herrenschmidt
parent ed5694a846
commit 71b0bfe4f1
1 changed files with 62 additions and 19 deletions
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81
arch/powerpc/mm/init_64.c
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@ -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);
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));
pr_debug(" * %016lx..%016lx allocated at %p\n",
start, start + page_size, p);
vmemmap_create_mapping(start, page_size, __pa(p));
vmemmap_remove_mapping(start, page_size);
}
}
return 0;
}
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)
{