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-rw-r--r--arch/ppc64/mm/init.c27
-rw-r--r--arch/ppc64/mm/numa.c43
-rw-r--r--include/asm-ppc64/lmb.h22
-rw-r--r--include/linux/mmzone.h30
-rw-r--r--mm/Kconfig9
-rw-r--r--mm/sparse.c38
6 files changed, 140 insertions, 29 deletions
diff --git a/arch/ppc64/mm/init.c b/arch/ppc64/mm/init.c
index c02dc9809ca5..b3b1e9c1770a 100644
--- a/arch/ppc64/mm/init.c
+++ b/arch/ppc64/mm/init.c
@@ -552,27 +552,18 @@ void __init do_init_bootmem(void)
/* Add all physical memory to the bootmem map, mark each area
* present.
*/
- for (i=0; i < lmb.memory.cnt; i++) {
- unsigned long base, size;
- unsigned long start_pfn, end_pfn;
-
- base = lmb.memory.region[i].base;
- size = lmb.memory.region[i].size;
-
- start_pfn = base >> PAGE_SHIFT;
- end_pfn = start_pfn + (size >> PAGE_SHIFT);
- memory_present(0, start_pfn, end_pfn);
-
- free_bootmem(base, size);
- }
+ for (i=0; i < lmb.memory.cnt; i++)
+ free_bootmem(lmb_start_pfn(&lmb.memory, i),
+ lmb_size_bytes(&lmb.memory, i));
/* reserve the sections we're already using */
- for (i=0; i < lmb.reserved.cnt; i++) {
- unsigned long base = lmb.reserved.region[i].base;
- unsigned long size = lmb.reserved.region[i].size;
+ for (i=0; i < lmb.reserved.cnt; i++)
+ reserve_bootmem(lmb_start_pfn(&lmb.reserved, i),
+ lmb_size_bytes(&lmb.reserved, i));
- reserve_bootmem(base, size);
- }
+ for (i=0; i < lmb.memory.cnt; i++)
+ memory_present(0, lmb_start_pfn(&lmb.memory, i),
+ lmb_end_pfn(&lmb.memory, i));
}
/*
diff --git a/arch/ppc64/mm/numa.c b/arch/ppc64/mm/numa.c
index c3116f0d788c..cb864b8f2750 100644
--- a/arch/ppc64/mm/numa.c
+++ b/arch/ppc64/mm/numa.c
@@ -440,8 +440,6 @@ new_range:
for (i = start ; i < (start+size); i += MEMORY_INCREMENT)
numa_memory_lookup_table[i >> MEMORY_INCREMENT_SHIFT] =
numa_domain;
- memory_present(numa_domain, start >> PAGE_SHIFT,
- (start + size) >> PAGE_SHIFT);
if (--ranges)
goto new_range;
@@ -483,7 +481,6 @@ static void __init setup_nonnuma(void)
for (i = 0 ; i < top_of_ram; i += MEMORY_INCREMENT)
numa_memory_lookup_table[i >> MEMORY_INCREMENT_SHIFT] = 0;
- memory_present(0, 0, init_node_data[0].node_end_pfn);
}
static void __init dump_numa_topology(void)
@@ -695,6 +692,46 @@ new_range:
size);
}
}
+ /*
+ * This loop may look famaliar, but we have to do it again
+ * after marking our reserved memory to mark memory present
+ * for sparsemem.
+ */
+ addr_cells = get_mem_addr_cells();
+ size_cells = get_mem_size_cells();
+ memory = NULL;
+ while ((memory = of_find_node_by_type(memory, "memory")) != NULL) {
+ unsigned long mem_start, mem_size;
+ int numa_domain, ranges;
+ unsigned int *memcell_buf;
+ unsigned int len;
+
+ memcell_buf = (unsigned int *)get_property(memory, "reg", &len);
+ if (!memcell_buf || len <= 0)
+ continue;
+
+ ranges = memory->n_addrs; /* ranges in cell */
+new_range2:
+ mem_start = read_n_cells(addr_cells, &memcell_buf);
+ mem_size = read_n_cells(size_cells, &memcell_buf);
+ if (numa_enabled) {
+ numa_domain = of_node_numa_domain(memory);
+ if (numa_domain >= MAX_NUMNODES)
+ numa_domain = 0;
+ } else
+ numa_domain = 0;
+
+ if (numa_domain != nid)
+ continue;
+
+ mem_size = numa_enforce_memory_limit(mem_start, mem_size);
+ memory_present(numa_domain, mem_start >> PAGE_SHIFT,
+ (mem_start + mem_size) >> PAGE_SHIFT);
+
+ if (--ranges) /* process all ranges in cell */
+ goto new_range2;
+ }
+
}
}
diff --git a/include/asm-ppc64/lmb.h b/include/asm-ppc64/lmb.h
index cb368bf0f264..de91e034bd98 100644
--- a/include/asm-ppc64/lmb.h
+++ b/include/asm-ppc64/lmb.h
@@ -56,4 +56,26 @@ extern void lmb_dump_all(void);
extern unsigned long io_hole_start;
+static inline unsigned long
+lmb_size_bytes(struct lmb_region *type, unsigned long region_nr)
+{
+ return type->region[region_nr].size;
+}
+static inline unsigned long
+lmb_size_pages(struct lmb_region *type, unsigned long region_nr)
+{
+ return lmb_size_bytes(type, region_nr) >> PAGE_SHIFT;
+}
+static inline unsigned long
+lmb_start_pfn(struct lmb_region *type, unsigned long region_nr)
+{
+ return type->region[region_nr].base >> PAGE_SHIFT;
+}
+static inline unsigned long
+lmb_end_pfn(struct lmb_region *type, unsigned long region_nr)
+{
+ return lmb_start_pfn(type, region_nr) +
+ lmb_size_pages(type, region_nr);
+}
+
#endif /* _PPC64_LMB_H */
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 6c90461ed99f..b97054bbc394 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -487,6 +487,28 @@ struct mem_section {
unsigned long section_mem_map;
};
+#ifdef CONFIG_ARCH_SPARSEMEM_EXTREME
+/*
+ * Should we ever require GCC 4 or later then the flat array scheme
+ * can be eliminated and a uniform solution for EXTREME and !EXTREME can
+ * be arrived at.
+ */
+#define SECTION_ROOT_SHIFT (PAGE_SHIFT-3)
+#define SECTION_ROOT_MASK ((1UL<<SECTION_ROOT_SHIFT) - 1)
+#define SECTION_TO_ROOT(_sec) ((_sec) >> SECTION_ROOT_SHIFT)
+#define NR_SECTION_ROOTS (NR_MEM_SECTIONS >> SECTION_ROOT_SHIFT)
+
+extern struct mem_section *mem_section[NR_SECTION_ROOTS];
+
+static inline struct mem_section *__nr_to_section(unsigned long nr)
+{
+ if (!mem_section[SECTION_TO_ROOT(nr)])
+ return NULL;
+ return &mem_section[SECTION_TO_ROOT(nr)][nr & SECTION_ROOT_MASK];
+}
+
+#else
+
extern struct mem_section mem_section[NR_MEM_SECTIONS];
static inline struct mem_section *__nr_to_section(unsigned long nr)
@@ -494,6 +516,10 @@ static inline struct mem_section *__nr_to_section(unsigned long nr)
return &mem_section[nr];
}
+#define sparse_index_init(_sec, _nid) do {} while (0)
+
+#endif
+
/*
* We use the lower bits of the mem_map pointer to store
* a little bit of information. There should be at least
@@ -513,12 +539,12 @@ static inline struct page *__section_mem_map_addr(struct mem_section *section)
static inline int valid_section(struct mem_section *section)
{
- return (section->section_mem_map & SECTION_MARKED_PRESENT);
+ return (section && (section->section_mem_map & SECTION_MARKED_PRESENT));
}
static inline int section_has_mem_map(struct mem_section *section)
{
- return (section->section_mem_map & SECTION_HAS_MEM_MAP);
+ return (section && (section->section_mem_map & SECTION_HAS_MEM_MAP));
}
static inline int valid_section_nr(unsigned long nr)
diff --git a/mm/Kconfig b/mm/Kconfig
index cd379936cac6..fc644c5c065d 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -89,3 +89,12 @@ config NEED_MULTIPLE_NODES
config HAVE_MEMORY_PRESENT
def_bool y
depends on ARCH_HAVE_MEMORY_PRESENT || SPARSEMEM
+
+#
+# Architectecture platforms which require a two level mem_section in SPARSEMEM
+# must select this option. This is usually for architecture platforms with
+# an extremely sparse physical address space.
+#
+config ARCH_SPARSEMEM_EXTREME
+ def_bool n
+ depends on SPARSEMEM && 64BIT
diff --git a/mm/sparse.c b/mm/sparse.c
index b54e304df4a7..b2b456bf0a5d 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -13,7 +13,26 @@
*
* 1) mem_section - memory sections, mem_map's for valid memory
*/
-struct mem_section mem_section[NR_MEM_SECTIONS];
+#ifdef CONFIG_ARCH_SPARSEMEM_EXTREME
+struct mem_section *mem_section[NR_SECTION_ROOTS]
+ ____cacheline_maxaligned_in_smp;
+
+static void sparse_index_init(unsigned long section, int nid)
+{
+ unsigned long root = SECTION_TO_ROOT(section);
+
+ if (mem_section[root])
+ return;
+ mem_section[root] = alloc_bootmem_node(NODE_DATA(nid), PAGE_SIZE);
+ if (mem_section[root])
+ memset(mem_section[root], 0, PAGE_SIZE);
+ else
+ panic("memory_present: NO MEMORY\n");
+}
+#else
+struct mem_section mem_section[NR_MEM_SECTIONS]
+ ____cacheline_maxaligned_in_smp;
+#endif
EXPORT_SYMBOL(mem_section);
/* Record a memory area against a node. */
@@ -24,8 +43,13 @@ void memory_present(int nid, unsigned long start, unsigned long end)
start &= PAGE_SECTION_MASK;
for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) {
unsigned long section = pfn_to_section_nr(pfn);
- if (!mem_section[section].section_mem_map)
- mem_section[section].section_mem_map = SECTION_MARKED_PRESENT;
+ struct mem_section *ms;
+
+ sparse_index_init(section, nid);
+
+ ms = __nr_to_section(section);
+ if (!ms->section_mem_map)
+ ms->section_mem_map = SECTION_MARKED_PRESENT;
}
}
@@ -85,6 +109,7 @@ static struct page *sparse_early_mem_map_alloc(unsigned long pnum)
{
struct page *map;
int nid = early_pfn_to_nid(section_nr_to_pfn(pnum));
+ struct mem_section *ms = __nr_to_section(pnum);
map = alloc_remap(nid, sizeof(struct page) * PAGES_PER_SECTION);
if (map)
@@ -96,7 +121,7 @@ static struct page *sparse_early_mem_map_alloc(unsigned long pnum)
return map;
printk(KERN_WARNING "%s: allocation failed\n", __FUNCTION__);
- mem_section[pnum].section_mem_map = 0;
+ ms->section_mem_map = 0;
return NULL;
}
@@ -114,8 +139,9 @@ void sparse_init(void)
continue;
map = sparse_early_mem_map_alloc(pnum);
- if (map)
- sparse_init_one_section(&mem_section[pnum], pnum, map);
+ if (!map)
+ continue;
+ sparse_init_one_section(__nr_to_section(pnum), pnum, map);
}
}