#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/vmalloc.h>
+#include "internal.h"
#include <asm/dma.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
unsigned long array_size = SECTIONS_PER_ROOT *
sizeof(struct mem_section);
- if (slab_is_available())
- section = kmalloc_node(array_size, GFP_KERNEL, nid);
- else
+ if (slab_is_available()) {
+ if (node_state(nid, N_HIGH_MEMORY))
+ section = kmalloc_node(array_size, GFP_KERNEL, nid);
+ else
+ section = kmalloc(array_size, GFP_KERNEL);
+ } else
section = alloc_bootmem_node(NODE_DATA(nid), array_size);
if (section)
return (section->section_mem_map >> SECTION_NID_SHIFT);
}
-/* Record a memory area against a node. */
-void __init memory_present(int nid, unsigned long start, unsigned long end)
+/* Validate the physical addressing limitations of the model */
+void __meminit mminit_validate_memmodel_limits(unsigned long *start_pfn,
+ unsigned long *end_pfn)
{
- unsigned long max_arch_pfn = 1UL << (MAX_PHYSMEM_BITS-PAGE_SHIFT);
- unsigned long pfn;
+ unsigned long max_sparsemem_pfn = 1UL << (MAX_PHYSMEM_BITS-PAGE_SHIFT);
/*
* Sanity checks - do not allow an architecture to pass
* in larger pfns than the maximum scope of sparsemem:
*/
- if (start >= max_arch_pfn)
- return;
- if (end >= max_arch_pfn)
- end = max_arch_pfn;
+ if (*start_pfn > max_sparsemem_pfn) {
+ mminit_dprintk(MMINIT_WARNING, "pfnvalidation",
+ "Start of range %lu -> %lu exceeds SPARSEMEM max %lu\n",
+ *start_pfn, *end_pfn, max_sparsemem_pfn);
+ WARN_ON_ONCE(1);
+ *start_pfn = max_sparsemem_pfn;
+ *end_pfn = max_sparsemem_pfn;
+ } else if (*end_pfn > max_sparsemem_pfn) {
+ mminit_dprintk(MMINIT_WARNING, "pfnvalidation",
+ "End of range %lu -> %lu exceeds SPARSEMEM max %lu\n",
+ *start_pfn, *end_pfn, max_sparsemem_pfn);
+ WARN_ON_ONCE(1);
+ *end_pfn = max_sparsemem_pfn;
+ }
+}
+
+/* Record a memory area against a node. */
+void __init memory_present(int nid, unsigned long start, unsigned long end)
+{
+ unsigned long pfn;
start &= PAGE_SECTION_MASK;
+ mminit_validate_memmodel_limits(&start, &end);
for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) {
unsigned long section = pfn_to_section_nr(pfn);
struct mem_section *ms;
unsigned long pfn;
unsigned long nr_pages = 0;
+ mminit_validate_memmodel_limits(&start_pfn, &end_pfn);
for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
if (nid != early_pfn_to_nid(pfn))
continue;
/*
* Decode mem_map from the coded memmap
*/
-static
struct page *sparse_decode_mem_map(unsigned long coded_mem_map, unsigned long pnum)
{
/* mask off the extra low bits of information */
return 1;
}
-static unsigned long usemap_size(void)
+unsigned long usemap_size(void)
{
unsigned long size_bytes;
size_bytes = roundup(SECTION_BLOCKFLAGS_BITS, 8) / 8;
}
#endif /* CONFIG_MEMORY_HOTPLUG */
+#ifdef CONFIG_MEMORY_HOTREMOVE
+static unsigned long * __init
+sparse_early_usemap_alloc_pgdat_section(struct pglist_data *pgdat)
+{
+ unsigned long section_nr;
+
+ /*
+ * A page may contain usemaps for other sections preventing the
+ * page being freed and making a section unremovable while
+ * other sections referencing the usemap retmain active. Similarly,
+ * a pgdat can prevent a section being removed. If section A
+ * contains a pgdat and section B contains the usemap, both
+ * sections become inter-dependent. This allocates usemaps
+ * from the same section as the pgdat where possible to avoid
+ * this problem.
+ */
+ section_nr = pfn_to_section_nr(__pa(pgdat) >> PAGE_SHIFT);
+ return alloc_bootmem_section(usemap_size(), section_nr);
+}
+
+static void __init check_usemap_section_nr(int nid, unsigned long *usemap)
+{
+ unsigned long usemap_snr, pgdat_snr;
+ static unsigned long old_usemap_snr = NR_MEM_SECTIONS;
+ static unsigned long old_pgdat_snr = NR_MEM_SECTIONS;
+ struct pglist_data *pgdat = NODE_DATA(nid);
+ int usemap_nid;
+
+ usemap_snr = pfn_to_section_nr(__pa(usemap) >> PAGE_SHIFT);
+ pgdat_snr = pfn_to_section_nr(__pa(pgdat) >> PAGE_SHIFT);
+ if (usemap_snr == pgdat_snr)
+ return;
+
+ if (old_usemap_snr == usemap_snr && old_pgdat_snr == pgdat_snr)
+ /* skip redundant message */
+ return;
+
+ old_usemap_snr = usemap_snr;
+ old_pgdat_snr = pgdat_snr;
+
+ usemap_nid = sparse_early_nid(__nr_to_section(usemap_snr));
+ if (usemap_nid != nid) {
+ printk(KERN_INFO
+ "node %d must be removed before remove section %ld\n",
+ nid, usemap_snr);
+ return;
+ }
+ /*
+ * There is a circular dependency.
+ * Some platforms allow un-removable section because they will just
+ * gather other removable sections for dynamic partitioning.
+ * Just notify un-removable section's number here.
+ */
+ printk(KERN_INFO "Section %ld and %ld (node %d)", usemap_snr,
+ pgdat_snr, nid);
+ printk(KERN_CONT
+ " have a circular dependency on usemap and pgdat allocations\n");
+}
+#else
+static unsigned long * __init
+sparse_early_usemap_alloc_pgdat_section(struct pglist_data *pgdat)
+{
+ return NULL;
+}
+
+static void __init check_usemap_section_nr(int nid, unsigned long *usemap)
+{
+}
+#endif /* CONFIG_MEMORY_HOTREMOVE */
+
static unsigned long *__init sparse_early_usemap_alloc(unsigned long pnum)
{
unsigned long *usemap;
struct mem_section *ms = __nr_to_section(pnum);
int nid = sparse_early_nid(ms);
- usemap = alloc_bootmem_node(NODE_DATA(nid), usemap_size());
+ usemap = sparse_early_usemap_alloc_pgdat_section(NODE_DATA(nid));
if (usemap)
return usemap;
+ usemap = alloc_bootmem_node(NODE_DATA(nid), usemap_size());
+ if (usemap) {
+ check_usemap_section_nr(nid, usemap);
+ return usemap;
+ }
+
/* Stupid: suppress gcc warning for SPARSEMEM && !NUMA */
nid = 0;
- printk(KERN_WARNING "%s: allocation failed\n", __FUNCTION__);
+ printk(KERN_WARNING "%s: allocation failed\n", __func__);
return NULL;
}
if (map)
return map;
- map = alloc_bootmem_node(NODE_DATA(nid),
- sizeof(struct page) * PAGES_PER_SECTION);
+ map = alloc_bootmem_pages_node(NODE_DATA(nid),
+ PAGE_ALIGN(sizeof(struct page) * PAGES_PER_SECTION));
return map;
}
#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
-struct page __init *sparse_early_mem_map_alloc(unsigned long pnum)
+static struct page __init *sparse_early_mem_map_alloc(unsigned long pnum)
{
struct page *map;
struct mem_section *ms = __nr_to_section(pnum);
return map;
printk(KERN_ERR "%s: sparsemem memory map backing failed "
- "some memory will not be available.\n", __FUNCTION__);
+ "some memory will not be available.\n", __func__);
ms->section_mem_map = 0;
return NULL;
}
{
return; /* XXX: Not implemented yet */
}
+static void free_map_bootmem(struct page *page, unsigned long nr_pages)
+{
+}
#else
static struct page *__kmalloc_section_memmap(unsigned long nr_pages)
{
free_pages((unsigned long)memmap,
get_order(sizeof(struct page) * nr_pages));
}
+
+static void free_map_bootmem(struct page *page, unsigned long nr_pages)
+{
+ unsigned long maps_section_nr, removing_section_nr, i;
+ int magic;
+
+ for (i = 0; i < nr_pages; i++, page++) {
+ magic = atomic_read(&page->_mapcount);
+
+ BUG_ON(magic == NODE_INFO);
+
+ maps_section_nr = pfn_to_section_nr(page_to_pfn(page));
+ removing_section_nr = page->private;
+
+ /*
+ * When this function is called, the removing section is
+ * logical offlined state. This means all pages are isolated
+ * from page allocator. If removing section's memmap is placed
+ * on the same section, it must not be freed.
+ * If it is freed, page allocator may allocate it which will
+ * be removed physically soon.
+ */
+ if (maps_section_nr != removing_section_nr)
+ put_page_bootmem(page);
+ }
+}
#endif /* CONFIG_SPARSEMEM_VMEMMAP */
static void free_section_usemap(struct page *memmap, unsigned long *usemap)
{
+ struct page *usemap_page;
+ unsigned long nr_pages;
+
if (!usemap)
return;
+ usemap_page = virt_to_page(usemap);
/*
* Check to see if allocation came from hot-plug-add
*/
- if (PageSlab(virt_to_page(usemap))) {
+ if (PageSlab(usemap_page)) {
kfree(usemap);
if (memmap)
__kfree_section_memmap(memmap, PAGES_PER_SECTION);
}
/*
- * TODO: Allocations came from bootmem - how do I free up ?
+ * The usemap came from bootmem. This is packed with other usemaps
+ * on the section which has pgdat at boot time. Just keep it as is now.
*/
- printk(KERN_WARNING "Not freeing up allocations from bootmem "
- "- leaking memory\n");
+
+ if (memmap) {
+ struct page *memmap_page;
+ memmap_page = virt_to_page(memmap);
+
+ nr_pages = PAGE_ALIGN(PAGES_PER_SECTION * sizeof(struct page))
+ >> PAGE_SHIFT;
+
+ free_map_bootmem(memmap_page, nr_pages);
+ }
}
/*
* set. If this is <=0, then that means that the passed-in
* map was not consumed and must be freed.
*/
-int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
+int __meminit sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
int nr_pages)
{
unsigned long section_nr = pfn_to_section_nr(start_pfn);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff