summaryrefslogtreecommitdiffstats
path: root/mm/memblock.c
diff options
context:
space:
mode:
Diffstat (limited to 'mm/memblock.c')
-rw-r--r--mm/memblock.c301
1 files changed, 159 insertions, 142 deletions
diff --git a/mm/memblock.c b/mm/memblock.c
index b775fca..e5f3f9b 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -24,40 +24,18 @@ static struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_REGIO
#define MEMBLOCK_ERROR (~(phys_addr_t)0)
-static int __init early_memblock(char *p)
-{
- if (p && strstr(p, "debug"))
- memblock_debug = 1;
- return 0;
-}
-early_param("memblock", early_memblock);
+/*
+ * Address comparison utilities
+ */
-static void memblock_dump(struct memblock_type *region, char *name)
+static phys_addr_t memblock_align_down(phys_addr_t addr, phys_addr_t size)
{
- unsigned long long base, size;
- int i;
-
- pr_info(" %s.cnt = 0x%lx\n", name, region->cnt);
-
- for (i = 0; i < region->cnt; i++) {
- base = region->regions[i].base;
- size = region->regions[i].size;
-
- pr_info(" %s[0x%x]\t0x%016llx - 0x%016llx, 0x%llx bytes\n",
- name, i, base, base + size - 1, size);
- }
+ return addr & ~(size - 1);
}
-void memblock_dump_all(void)
+static phys_addr_t memblock_align_up(phys_addr_t addr, phys_addr_t size)
{
- if (!memblock_debug)
- return;
-
- pr_info("MEMBLOCK configuration:\n");
- pr_info(" memory size = 0x%llx\n", (unsigned long long)memblock.memory_size);
-
- memblock_dump(&memblock.memory, "memory");
- memblock_dump(&memblock.reserved, "reserved");
+ return (addr + (size - 1)) & ~(size - 1);
}
static unsigned long memblock_addrs_overlap(phys_addr_t base1, phys_addr_t size1,
@@ -88,6 +66,77 @@ static long memblock_regions_adjacent(struct memblock_type *type,
return memblock_addrs_adjacent(base1, size1, base2, size2);
}
+long memblock_overlaps_region(struct memblock_type *type, phys_addr_t base, phys_addr_t size)
+{
+ unsigned long i;
+
+ for (i = 0; i < type->cnt; i++) {
+ phys_addr_t rgnbase = type->regions[i].base;
+ phys_addr_t rgnsize = type->regions[i].size;
+ if (memblock_addrs_overlap(base, size, rgnbase, rgnsize))
+ break;
+ }
+
+ return (i < type->cnt) ? i : -1;
+}
+
+/*
+ * Find, allocate, deallocate or reserve unreserved regions. All allocations
+ * are top-down.
+ */
+
+static phys_addr_t __init memblock_find_region(phys_addr_t start, phys_addr_t end,
+ phys_addr_t size, phys_addr_t align)
+{
+ phys_addr_t base, res_base;
+ long j;
+
+ base = memblock_align_down((end - size), align);
+ while (start <= base) {
+ j = memblock_overlaps_region(&memblock.reserved, base, size);
+ if (j < 0)
+ return base;
+ res_base = memblock.reserved.regions[j].base;
+ if (res_base < size)
+ break;
+ base = memblock_align_down(res_base - size, align);
+ }
+
+ return MEMBLOCK_ERROR;
+}
+
+static phys_addr_t __init memblock_find_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
+{
+ long i;
+ phys_addr_t base = 0;
+ phys_addr_t res_base;
+
+ BUG_ON(0 == size);
+
+ size = memblock_align_up(size, align);
+
+ /* Pump up max_addr */
+ if (max_addr == MEMBLOCK_ALLOC_ACCESSIBLE)
+ max_addr = memblock.current_limit;
+
+ /* We do a top-down search, this tends to limit memory
+ * fragmentation by keeping early boot allocs near the
+ * top of memory
+ */
+ for (i = memblock.memory.cnt - 1; i >= 0; i--) {
+ phys_addr_t memblockbase = memblock.memory.regions[i].base;
+ phys_addr_t memblocksize = memblock.memory.regions[i].size;
+
+ if (memblocksize < size)
+ continue;
+ base = min(memblockbase + memblocksize, max_addr);
+ res_base = memblock_find_region(memblockbase, base, size, align);
+ if (res_base != MEMBLOCK_ERROR)
+ return res_base;
+ }
+ return MEMBLOCK_ERROR;
+}
+
static void memblock_remove_region(struct memblock_type *type, unsigned long r)
{
unsigned long i;
@@ -107,22 +156,6 @@ static void memblock_coalesce_regions(struct memblock_type *type,
memblock_remove_region(type, r2);
}
-void __init memblock_analyze(void)
-{
- int i;
-
- /* Check marker in the unused last array entry */
- WARN_ON(memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS].base
- != (phys_addr_t)RED_INACTIVE);
- WARN_ON(memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS].base
- != (phys_addr_t)RED_INACTIVE);
-
- memblock.memory_size = 0;
-
- for (i = 0; i < memblock.memory.cnt; i++)
- memblock.memory_size += memblock.memory.regions[i].size;
-}
-
static long memblock_add_region(struct memblock_type *type, phys_addr_t base, phys_addr_t size)
{
unsigned long coalesced = 0;
@@ -260,49 +293,47 @@ long __init memblock_reserve(phys_addr_t base, phys_addr_t size)
return memblock_add_region(_rgn, base, size);
}
-long memblock_overlaps_region(struct memblock_type *type, phys_addr_t base, phys_addr_t size)
+phys_addr_t __init __memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
{
- unsigned long i;
+ phys_addr_t found;
- for (i = 0; i < type->cnt; i++) {
- phys_addr_t rgnbase = type->regions[i].base;
- phys_addr_t rgnsize = type->regions[i].size;
- if (memblock_addrs_overlap(base, size, rgnbase, rgnsize))
- break;
- }
+ /* We align the size to limit fragmentation. Without this, a lot of
+ * small allocs quickly eat up the whole reserve array on sparc
+ */
+ size = memblock_align_up(size, align);
- return (i < type->cnt) ? i : -1;
-}
+ found = memblock_find_base(size, align, max_addr);
+ if (found != MEMBLOCK_ERROR &&
+ memblock_add_region(&memblock.reserved, found, size) >= 0)
+ return found;
-static phys_addr_t memblock_align_down(phys_addr_t addr, phys_addr_t size)
-{
- return addr & ~(size - 1);
+ return 0;
}
-static phys_addr_t memblock_align_up(phys_addr_t addr, phys_addr_t size)
+phys_addr_t __init memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
{
- return (addr + (size - 1)) & ~(size - 1);
+ phys_addr_t alloc;
+
+ alloc = __memblock_alloc_base(size, align, max_addr);
+
+ if (alloc == 0)
+ panic("ERROR: Failed to allocate 0x%llx bytes below 0x%llx.\n",
+ (unsigned long long) size, (unsigned long long) max_addr);
+
+ return alloc;
}
-static phys_addr_t __init memblock_find_region(phys_addr_t start, phys_addr_t end,
- phys_addr_t size, phys_addr_t align)
+phys_addr_t __init memblock_alloc(phys_addr_t size, phys_addr_t align)
{
- phys_addr_t base, res_base;
- long j;
+ return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE);
+}
- base = memblock_align_down((end - size), align);
- while (start <= base) {
- j = memblock_overlaps_region(&memblock.reserved, base, size);
- if (j < 0)
- return base;
- res_base = memblock.reserved.regions[j].base;
- if (res_base < size)
- break;
- base = memblock_align_down(res_base - size, align);
- }
- return MEMBLOCK_ERROR;
-}
+/*
+ * Additional node-local allocators. Search for node memory is bottom up
+ * and walks memblock regions within that node bottom-up as well, but allocation
+ * within an memblock region is top-down.
+ */
phys_addr_t __weak __init memblock_nid_range(phys_addr_t start, phys_addr_t end, int *nid)
{
@@ -364,72 +395,6 @@ phys_addr_t __init memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int n
return memblock_alloc(size, align);
}
-phys_addr_t __init memblock_alloc(phys_addr_t size, phys_addr_t align)
-{
- return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE);
-}
-
-static phys_addr_t __init memblock_find_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
-{
- long i;
- phys_addr_t base = 0;
- phys_addr_t res_base;
-
- BUG_ON(0 == size);
-
- /* Pump up max_addr */
- if (max_addr == MEMBLOCK_ALLOC_ACCESSIBLE)
- max_addr = memblock.current_limit;
-
- /* We do a top-down search, this tends to limit memory
- * fragmentation by keeping early boot allocs near the
- * top of memory
- */
- for (i = memblock.memory.cnt - 1; i >= 0; i--) {
- phys_addr_t memblockbase = memblock.memory.regions[i].base;
- phys_addr_t memblocksize = memblock.memory.regions[i].size;
-
- if (memblocksize < size)
- continue;
- base = min(memblockbase + memblocksize, max_addr);
- res_base = memblock_find_region(memblockbase, base, size, align);
- if (res_base != MEMBLOCK_ERROR)
- return res_base;
- }
- return MEMBLOCK_ERROR;
-}
-
-phys_addr_t __init __memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
-{
- phys_addr_t found;
-
- /* We align the size to limit fragmentation. Without this, a lot of
- * small allocs quickly eat up the whole reserve array on sparc
- */
- size = memblock_align_up(size, align);
-
- found = memblock_find_base(size, align, max_addr);
- if (found != MEMBLOCK_ERROR &&
- memblock_add_region(&memblock.reserved, found, size) >= 0)
- return found;
-
- return 0;
-}
-
-phys_addr_t __init memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
-{
- phys_addr_t alloc;
-
- alloc = __memblock_alloc_base(size, align, max_addr);
-
- if (alloc == 0)
- panic("ERROR: Failed to allocate 0x%llx bytes below 0x%llx.\n",
- (unsigned long long) size, (unsigned long long) max_addr);
-
- return alloc;
-}
-
-
/* You must call memblock_analyze() before this. */
phys_addr_t __init memblock_phys_mem_size(void)
{
@@ -534,6 +499,50 @@ void __init memblock_set_current_limit(phys_addr_t limit)
memblock.current_limit = limit;
}
+static void memblock_dump(struct memblock_type *region, char *name)
+{
+ unsigned long long base, size;
+ int i;
+
+ pr_info(" %s.cnt = 0x%lx\n", name, region->cnt);
+
+ for (i = 0; i < region->cnt; i++) {
+ base = region->regions[i].base;
+ size = region->regions[i].size;
+
+ pr_info(" %s[0x%x]\t0x%016llx - 0x%016llx, 0x%llx bytes\n",
+ name, i, base, base + size - 1, size);
+ }
+}
+
+void memblock_dump_all(void)
+{
+ if (!memblock_debug)
+ return;
+
+ pr_info("MEMBLOCK configuration:\n");
+ pr_info(" memory size = 0x%llx\n", (unsigned long long)memblock.memory_size);
+
+ memblock_dump(&memblock.memory, "memory");
+ memblock_dump(&memblock.reserved, "reserved");
+}
+
+void __init memblock_analyze(void)
+{
+ int i;
+
+ /* Check marker in the unused last array entry */
+ WARN_ON(memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS].base
+ != (phys_addr_t)RED_INACTIVE);
+ WARN_ON(memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS].base
+ != (phys_addr_t)RED_INACTIVE);
+
+ memblock.memory_size = 0;
+
+ for (i = 0; i < memblock.memory.cnt; i++)
+ memblock.memory_size += memblock.memory.regions[i].size;
+}
+
void __init memblock_init(void)
{
/* Hookup the initial arrays */
@@ -561,3 +570,11 @@ void __init memblock_init(void)
memblock.current_limit = MEMBLOCK_ALLOC_ANYWHERE;
}
+static int __init early_memblock(char *p)
+{
+ if (p && strstr(p, "debug"))
+ memblock_debug = 1;
+ return 0;
+}
+early_param("memblock", early_memblock);
+
OpenPOWER on IntegriCloud