Merge branch 'mpi-master' into wip-k-fmlpwip-k-fmlp

Conflicts:
	litmus/sched_cedf.c

1 files changed, 633 insertions, 311 deletions

diff --git a/mm/memblock.c b/mm/memblock.c
index 43840b305ecb..a0562d1a6ad4 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -11,446 +11,634 @@
  */
 
 #include <linux/kernel.h>
+#include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/bitops.h>
+#include <linux/poison.h>
+#include <linux/pfn.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
 #include <linux/memblock.h>
 
-#define MEMBLOCK_ALLOC_ANYWHERE 0
+struct memblock memblock __initdata_memblock;
 
-struct memblock memblock;
+int memblock_debug __initdata_memblock;
+int memblock_can_resize __initdata_memblock;
+static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS + 1] __initdata_memblock;
+static struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS + 1] __initdata_memblock;
 
-static int memblock_debug;
+/* inline so we don't get a warning when pr_debug is compiled out */
+static inline const char *memblock_type_name(struct memblock_type *type)
+{
+        if (type == &memblock.memory)
+                return "memory";
+        else if (type == &memblock.reserved)
+                return "reserved";
+        else
+                return "unknown";
+}
 
-static int __init early_memblock(char *p)
+/*
+ * Address comparison utilities
+ */
+
+static phys_addr_t __init_memblock memblock_align_down(phys_addr_t addr, phys_addr_t size)
 {
-        if (p && strstr(p, "debug"))
-                memblock_debug = 1;
-        return 0;
+        return addr & ~(size - 1);
 }
-early_param("memblock", early_memblock);
 
-static void memblock_dump(struct memblock_region *region, char *name)
+static phys_addr_t __init_memblock memblock_align_up(phys_addr_t addr, phys_addr_t size)
 {
-        unsigned long long base, size;
-        int i;
+        return (addr + (size - 1)) & ~(size - 1);
+}
 
-        pr_info(" %s.cnt  = 0x%lx\n", name, region->cnt);
+static unsigned long __init_memblock memblock_addrs_overlap(phys_addr_t base1, phys_addr_t size1,
+                                       phys_addr_t base2, phys_addr_t size2)
+{
+        return ((base1 < (base2 + size2)) && (base2 < (base1 + size1)));
+}
 
-        for (i = 0; i < region->cnt; i++) {
-                base = region->region[i].base;
-                size = region->region[i].size;
+long __init_memblock memblock_overlaps_region(struct memblock_type *type, phys_addr_t base, phys_addr_t size)
+{
+        unsigned long i;
 
-                pr_info(" %s[0x%x]\t0x%016llx - 0x%016llx, 0x%llx bytes\n",
-                    name, i, base, base + size - 1, size);
+        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;
 }
 
-void memblock_dump_all(void)
+/*
+ * Find, allocate, deallocate or reserve unreserved regions. All allocations
+ * are top-down.
+ */
+
+static phys_addr_t __init_memblock memblock_find_region(phys_addr_t start, phys_addr_t end,
+                                          phys_addr_t size, phys_addr_t align)
 {
-        if (!memblock_debug)
-                return;
+        phys_addr_t base, res_base;
+        long j;
 
-        pr_info("MEMBLOCK configuration:\n");
-        pr_info(" rmo_size    = 0x%llx\n", (unsigned long long)memblock.rmo_size);
-        pr_info(" memory.size = 0x%llx\n", (unsigned long long)memblock.memory.size);
+        /* In case, huge size is requested */
+        if (end < size)
+                return MEMBLOCK_ERROR;
 
-        memblock_dump(&memblock.memory, "memory");
-        memblock_dump(&memblock.reserved, "reserved");
+        base = memblock_align_down((end - size), align);
+
+        /* Prevent allocations returning 0 as it's also used to
+         * indicate an allocation failure
+         */
+        if (start == 0)
+                start = PAGE_SIZE;
+
+        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 unsigned long memblock_addrs_overlap(u64 base1, u64 size1, u64 base2,
-                                        u64 size2)
+static phys_addr_t __init_memblock memblock_find_base(phys_addr_t size,
+                        phys_addr_t align, phys_addr_t start, phys_addr_t end)
 {
-        return ((base1 < (base2 + size2)) && (base2 < (base1 + size1)));
+        long i;
+
+        BUG_ON(0 == size);
+
+        /* Pump up max_addr */
+        if (end == MEMBLOCK_ALLOC_ACCESSIBLE)
+                end = 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;
+                phys_addr_t bottom, top, found;
+
+                if (memblocksize < size)
+                        continue;
+                if ((memblockbase + memblocksize) <= start)
+                        break;
+                bottom = max(memblockbase, start);
+                top = min(memblockbase + memblocksize, end);
+                if (bottom >= top)
+                        continue;
+                found = memblock_find_region(bottom, top, size, align);
+                if (found != MEMBLOCK_ERROR)
+                        return found;
+        }
+        return MEMBLOCK_ERROR;
 }
 
-static long memblock_addrs_adjacent(u64 base1, u64 size1, u64 base2, u64 size2)
+/*
+ * Find a free area with specified alignment in a specific range.
+ */
+u64 __init_memblock memblock_find_in_range(u64 start, u64 end, u64 size, u64 align)
 {
-        if (base2 == base1 + size1)
-                return 1;
-        else if (base1 == base2 + size2)
-                return -1;
+        return memblock_find_base(size, align, start, end);
+}
 
-        return 0;
+/*
+ * Free memblock.reserved.regions
+ */
+int __init_memblock memblock_free_reserved_regions(void)
+{
+        if (memblock.reserved.regions == memblock_reserved_init_regions)
+                return 0;
+
+        return memblock_free(__pa(memblock.reserved.regions),
+                 sizeof(struct memblock_region) * memblock.reserved.max);
 }
 
-static long memblock_regions_adjacent(struct memblock_region *rgn,
-                unsigned long r1, unsigned long r2)
+/*
+ * Reserve memblock.reserved.regions
+ */
+int __init_memblock memblock_reserve_reserved_regions(void)
 {
-        u64 base1 = rgn->region[r1].base;
-        u64 size1 = rgn->region[r1].size;
-        u64 base2 = rgn->region[r2].base;
-        u64 size2 = rgn->region[r2].size;
+        if (memblock.reserved.regions == memblock_reserved_init_regions)
+                return 0;
 
-        return memblock_addrs_adjacent(base1, size1, base2, size2);
+        return memblock_reserve(__pa(memblock.reserved.regions),
+                 sizeof(struct memblock_region) * memblock.reserved.max);
 }
 
-static void memblock_remove_region(struct memblock_region *rgn, unsigned long r)
+static void __init_memblock memblock_remove_region(struct memblock_type *type, unsigned long r)
 {
         unsigned long i;
 
-        for (i = r; i < rgn->cnt - 1; i++) {
-                rgn->region[i].base = rgn->region[i + 1].base;
-                rgn->region[i].size = rgn->region[i + 1].size;
+        for (i = r; i < type->cnt - 1; i++) {
+                type->regions[i].base = type->regions[i + 1].base;
+                type->regions[i].size = type->regions[i + 1].size;
         }
-        rgn->cnt--;
-}
+        type->cnt--;
 
-/* Assumption: base addr of region 1 < base addr of region 2 */
-static void memblock_coalesce_regions(struct memblock_region *rgn,
-                unsigned long r1, unsigned long r2)
-{
-        rgn->region[r1].size += rgn->region[r2].size;
-        memblock_remove_region(rgn, r2);
+        /* Special case for empty arrays */
+        if (type->cnt == 0) {
+                type->cnt = 1;
+                type->regions[0].base = 0;
+                type->regions[0].size = 0;
+        }
 }
 
-void __init memblock_init(void)
+/* Defined below but needed now */
+static long memblock_add_region(struct memblock_type *type, phys_addr_t base, phys_addr_t size);
+
+static int __init_memblock memblock_double_array(struct memblock_type *type)
 {
-        /* Create a dummy zero size MEMBLOCK which will get coalesced away later.
-         * This simplifies the memblock_add() code below...
+        struct memblock_region *new_array, *old_array;
+        phys_addr_t old_size, new_size, addr;
+        int use_slab = slab_is_available();
+
+        /* We don't allow resizing until we know about the reserved regions
+         * of memory that aren't suitable for allocation
          */
-        memblock.memory.region[0].base = 0;
-        memblock.memory.region[0].size = 0;
-        memblock.memory.cnt = 1;
+        if (!memblock_can_resize)
+                return -1;
 
-        /* Ditto. */
-        memblock.reserved.region[0].base = 0;
-        memblock.reserved.region[0].size = 0;
-        memblock.reserved.cnt = 1;
-}
+        /* Calculate new doubled size */
+        old_size = type->max * sizeof(struct memblock_region);
+        new_size = old_size << 1;
+
+        /* Try to find some space for it.
+         *
+         * WARNING: We assume that either slab_is_available() and we use it or
+         * we use MEMBLOCK for allocations. That means that this is unsafe to use
+         * when bootmem is currently active (unless bootmem itself is implemented
+         * on top of MEMBLOCK which isn't the case yet)
+         *
+         * This should however not be an issue for now, as we currently only
+         * call into MEMBLOCK while it's still active, or much later when slab is
+         * active for memory hotplug operations
+         */
+        if (use_slab) {
+                new_array = kmalloc(new_size, GFP_KERNEL);
+                addr = new_array == NULL ? MEMBLOCK_ERROR : __pa(new_array);
+        } else
+                addr = memblock_find_base(new_size, sizeof(phys_addr_t), 0, MEMBLOCK_ALLOC_ACCESSIBLE);
+        if (addr == MEMBLOCK_ERROR) {
+                pr_err("memblock: Failed to double %s array from %ld to %ld entries !\n",
+                       memblock_type_name(type), type->max, type->max * 2);
+                return -1;
+        }
+        new_array = __va(addr);
 
-void __init memblock_analyze(void)
-{
-        int i;
+        memblock_dbg("memblock: %s array is doubled to %ld at [%#010llx-%#010llx]",
+                 memblock_type_name(type), type->max * 2, (u64)addr, (u64)addr + new_size - 1);
 
-        memblock.memory.size = 0;
+        /* Found space, we now need to move the array over before
+         * we add the reserved region since it may be our reserved
+         * array itself that is full.
+         */
+        memcpy(new_array, type->regions, old_size);
+        memset(new_array + type->max, 0, old_size);
+        old_array = type->regions;
+        type->regions = new_array;
+        type->max <<= 1;
+
+        /* If we use SLAB that's it, we are done */
+        if (use_slab)
+                return 0;
 
-        for (i = 0; i < memblock.memory.cnt; i++)
-                memblock.memory.size += memblock.memory.region[i].size;
+        /* Add the new reserved region now. Should not fail ! */
+        BUG_ON(memblock_add_region(&memblock.reserved, addr, new_size));
+
+        /* If the array wasn't our static init one, then free it. We only do
+         * that before SLAB is available as later on, we don't know whether
+         * to use kfree or free_bootmem_pages(). Shouldn't be a big deal
+         * anyways
+         */
+        if (old_array != memblock_memory_init_regions &&
+            old_array != memblock_reserved_init_regions)
+                memblock_free(__pa(old_array), old_size);
+
+        return 0;
+}
+
+extern int __init_memblock __weak memblock_memory_can_coalesce(phys_addr_t addr1, phys_addr_t size1,
+                                          phys_addr_t addr2, phys_addr_t size2)
+{
+        return 1;
 }
 
-static long memblock_add_region(struct memblock_region *rgn, u64 base, u64 size)
+static long __init_memblock memblock_add_region(struct memblock_type *type,
+                                                phys_addr_t base, phys_addr_t size)
 {
-        unsigned long coalesced = 0;
-        long adjacent, i;
+        phys_addr_t end = base + size;
+        int i, slot = -1;
 
-        if ((rgn->cnt == 1) && (rgn->region[0].size == 0)) {
-                rgn->region[0].base = base;
-                rgn->region[0].size = size;
-                return 0;
-        }
+        /* First try and coalesce this MEMBLOCK with others */
+        for (i = 0; i < type->cnt; i++) {
+                struct memblock_region *rgn = &type->regions[i];
+                phys_addr_t rend = rgn->base + rgn->size;
 
-        /* First try and coalesce this MEMBLOCK with another. */
-        for (i = 0; i < rgn->cnt; i++) {
-                u64 rgnbase = rgn->region[i].base;
-                u64 rgnsize = rgn->region[i].size;
+                /* Exit if there's no possible hits */
+                if (rgn->base > end || rgn->size == 0)
+                        break;
 
-                if ((rgnbase == base) && (rgnsize == size))
-                        /* Already have this region, so we're done */
+                /* Check if we are fully enclosed within an existing
+                 * block
+                 */
+                if (rgn->base <= base && rend >= end)
                         return 0;
 
-                adjacent = memblock_addrs_adjacent(base, size, rgnbase, rgnsize);
-                if (adjacent > 0) {
-                        rgn->region[i].base -= size;
-                        rgn->region[i].size += size;
-                        coalesced++;
-                        break;
-                } else if (adjacent < 0) {
-                        rgn->region[i].size += size;
-                        coalesced++;
-                        break;
+                /* Check if we overlap or are adjacent with the bottom
+                 * of a block.
+                 */
+                if (base < rgn->base && end >= rgn->base) {
+                        /* If we can't coalesce, create a new block */
+                        if (!memblock_memory_can_coalesce(base, size,
+                                                          rgn->base,
+                                                          rgn->size)) {
+                                /* Overlap & can't coalesce are mutually
+                                 * exclusive, if you do that, be prepared
+                                 * for trouble
+                                 */
+                                WARN_ON(end != rgn->base);
+                                goto new_block;
+                        }
+                        /* We extend the bottom of the block down to our
+                         * base
+                         */
+                        rgn->base = base;
+                        rgn->size = rend - base;
+
+                        /* Return if we have nothing else to allocate
+                         * (fully coalesced)
+                         */
+                        if (rend >= end)
+                                return 0;
+
+                        /* We continue processing from the end of the
+                         * coalesced block.
+                         */
+                        base = rend;
+                        size = end - base;
+                }
+
+                /* Now check if we overlap or are adjacent with the
+                 * top of a block
+                 */
+                if (base <= rend && end >= rend) {
+                        /* If we can't coalesce, create a new block */
+                        if (!memblock_memory_can_coalesce(rgn->base,
+                                                          rgn->size,
+                                                          base, size)) {
+                                /* Overlap & can't coalesce are mutually
+                                 * exclusive, if you do that, be prepared
+                                 * for trouble
+                                 */
+                                WARN_ON(rend != base);
+                                goto new_block;
+                        }
+                        /* We adjust our base down to enclose the
+                         * original block and destroy it. It will be
+                         * part of our new allocation. Since we've
+                         * freed an entry, we know we won't fail
+                         * to allocate one later, so we won't risk
+                         * losing the original block allocation.
+                         */
+                        size += (base - rgn->base);
+                        base = rgn->base;
+                        memblock_remove_region(type, i--);
                 }
         }
 
-        if ((i < rgn->cnt - 1) && memblock_regions_adjacent(rgn, i, i+1)) {
-                memblock_coalesce_regions(rgn, i, i+1);
-                coalesced++;
+        /* If the array is empty, special case, replace the fake
+         * filler region and return
+         */
+        if ((type->cnt == 1) && (type->regions[0].size == 0)) {
+                type->regions[0].base = base;
+                type->regions[0].size = size;
+                return 0;
         }
 
-        if (coalesced)
-                return coalesced;
-        if (rgn->cnt >= MAX_MEMBLOCK_REGIONS)
+ new_block:
+        /* If we are out of space, we fail. It's too late to resize the array
+         * but then this shouldn't have happened in the first place.
+         */
+        if (WARN_ON(type->cnt >= type->max))
                 return -1;
 
         /* Couldn't coalesce the MEMBLOCK, so add it to the sorted table. */
-        for (i = rgn->cnt - 1; i >= 0; i--) {
-                if (base < rgn->region[i].base) {
-                        rgn->region[i+1].base = rgn->region[i].base;
-                        rgn->region[i+1].size = rgn->region[i].size;
+        for (i = type->cnt - 1; i >= 0; i--) {
+                if (base < type->regions[i].base) {
+                        type->regions[i+1].base = type->regions[i].base;
+                        type->regions[i+1].size = type->regions[i].size;
                 } else {
-                        rgn->region[i+1].base = base;
-                        rgn->region[i+1].size = size;
+                        type->regions[i+1].base = base;
+                        type->regions[i+1].size = size;
+                        slot = i + 1;
                         break;
                 }
         }
+        if (base < type->regions[0].base) {
+                type->regions[0].base = base;
+                type->regions[0].size = size;
+                slot = 0;
+        }
+        type->cnt++;
 
-        if (base < rgn->region[0].base) {
-                rgn->region[0].base = base;
-                rgn->region[0].size = size;
+        /* The array is full ? Try to resize it. If that fails, we undo
+         * our allocation and return an error
+         */
+        if (type->cnt == type->max && memblock_double_array(type)) {
+                BUG_ON(slot < 0);
+                memblock_remove_region(type, slot);
+                return -1;
         }
-        rgn->cnt++;
 
         return 0;
 }
 
-long memblock_add(u64 base, u64 size)
+long __init_memblock memblock_add(phys_addr_t base, phys_addr_t size)
 {
-        struct memblock_region *_rgn = &memblock.memory;
-
-        /* On pSeries LPAR systems, the first MEMBLOCK is our RMO region. */
-        if (base == 0)
-                memblock.rmo_size = size;
-
-        return memblock_add_region(_rgn, base, size);
+        return memblock_add_region(&memblock.memory, base, size);
 
 }
 
-static long __memblock_remove(struct memblock_region *rgn, u64 base, u64 size)
+static long __init_memblock __memblock_remove(struct memblock_type *type,
+                                              phys_addr_t base, phys_addr_t size)
 {
-        u64 rgnbegin, rgnend;
-        u64 end = base + size;
+        phys_addr_t end = base + size;
         int i;
 
-        rgnbegin = rgnend = 0; /* supress gcc warnings */
-
-        /* Find the region where (base, size) belongs to */
-        for (i=0; i < rgn->cnt; i++) {
-                rgnbegin = rgn->region[i].base;
-                rgnend = rgnbegin + rgn->region[i].size;
+        /* Walk through the array for collisions */
+        for (i = 0; i < type->cnt; i++) {
+                struct memblock_region *rgn = &type->regions[i];
+                phys_addr_t rend = rgn->base + rgn->size;
 
-                if ((rgnbegin <= base) && (end <= rgnend))
+                /* Nothing more to do, exit */
+                if (rgn->base > end || rgn->size == 0)
                         break;
-        }
 
-        /* Didn't find the region */
-        if (i == rgn->cnt)
-                return -1;
+                /* If we fully enclose the block, drop it */
+                if (base <= rgn->base && end >= rend) {
+                        memblock_remove_region(type, i--);
+                        continue;
+                }
 
-        /* Check to see if we are removing entire region */
-        if ((rgnbegin == base) && (rgnend == end)) {
-                memblock_remove_region(rgn, i);
-                return 0;
-        }
+                /* If we are fully enclosed within a block
+                 * then we need to split it and we are done
+                 */
+                if (base > rgn->base && end < rend) {
+                        rgn->size = base - rgn->base;
+                        if (!memblock_add_region(type, end, rend - end))
+                                return 0;
+                        /* Failure to split is bad, we at least
+                         * restore the block before erroring
+                         */
+                        rgn->size = rend - rgn->base;
+                        WARN_ON(1);
+                        return -1;
+                }
 
-        /* Check to see if region is matching at the front */
-        if (rgnbegin == base) {
-                rgn->region[i].base = end;
-                rgn->region[i].size -= size;
-                return 0;
-        }
+                /* Check if we need to trim the bottom of a block */
+                if (rgn->base < end && rend > end) {
+                        rgn->size -= end - rgn->base;
+                        rgn->base = end;
+                        break;
+                }
 
-        /* Check to see if the region is matching at the end */
-        if (rgnend == end) {
-                rgn->region[i].size -= size;
-                return 0;
-        }
+                /* And check if we need to trim the top of a block */
+                if (base < rend)
+                        rgn->size -= rend - base;
 
-        /*
-         * We need to split the entry -  adjust the current one to the
-         * beginging of the hole and add the region after hole.
-         */
-        rgn->region[i].size = base - rgn->region[i].base;
-        return memblock_add_region(rgn, end, rgnend - end);
+        }
+        return 0;
 }
 
-long memblock_remove(u64 base, u64 size)
+long __init_memblock memblock_remove(phys_addr_t base, phys_addr_t size)
 {
         return __memblock_remove(&memblock.memory, base, size);
 }
 
-long __init memblock_free(u64 base, u64 size)
+long __init_memblock memblock_free(phys_addr_t base, phys_addr_t size)
 {
         return __memblock_remove(&memblock.reserved, base, size);
 }
 
-long __init memblock_reserve(u64 base, u64 size)
+long __init_memblock memblock_reserve(phys_addr_t base, phys_addr_t size)
 {
-        struct memblock_region *_rgn = &memblock.reserved;
+        struct memblock_type *_rgn = &memblock.reserved;
 
         BUG_ON(0 == size);
 
         return memblock_add_region(_rgn, base, size);
 }
 
-long memblock_overlaps_region(struct memblock_region *rgn, u64 base, u64 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 < rgn->cnt; i++) {
-                u64 rgnbase = rgn->region[i].base;
-                u64 rgnsize = rgn->region[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 < rgn->cnt) ? i : -1;
+        found = memblock_find_base(size, align, 0, max_addr);
+        if (found != MEMBLOCK_ERROR &&
+            !memblock_add_region(&memblock.reserved, found, size))
+                return found;
+
+        return 0;
 }
 
-static u64 memblock_align_down(u64 addr, u64 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);
+        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 u64 memblock_align_up(u64 addr, u64 size)
+phys_addr_t __init memblock_alloc(phys_addr_t size, phys_addr_t align)
 {
-        return (addr + (size - 1)) & ~(size - 1);
+        return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE);
 }
 
-static u64 __init memblock_alloc_nid_unreserved(u64 start, u64 end,
-                                           u64 size, u64 align)
+
+/*
+ * 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. XXX I plan to fix that at some stage
+ *
+ * WARNING: Only available after early_node_map[] has been populated,
+ * on some architectures, that is after all the calls to add_active_range()
+ * have been done to populate it.
+ */
+
+phys_addr_t __weak __init memblock_nid_range(phys_addr_t start, phys_addr_t end, int *nid)
 {
-        u64 base, res_base;
-        long j;
+#ifdef CONFIG_ARCH_POPULATES_NODE_MAP
+        /*
+         * This code originates from sparc which really wants use to walk by addresses
+         * and returns the nid. This is not very convenient for early_pfn_map[] users
+         * as the map isn't sorted yet, and it really wants to be walked by nid.
+         *
+         * For now, I implement the inefficient method below which walks the early
+         * map multiple times. Eventually we may want to use an ARCH config option
+         * to implement a completely different method for both case.
+         */
+        unsigned long start_pfn, end_pfn;
+        int i;
 
-        base = memblock_align_down((end - size), align);
-        while (start <= base) {
-                j = memblock_overlaps_region(&memblock.reserved, base, size);
-                if (j < 0) {
-                        /* this area isn't reserved, take it */
-                        if (memblock_add_region(&memblock.reserved, base, size) < 0)
-                                base = ~(u64)0;
-                        return base;
-                }
-                res_base = memblock.reserved.region[j].base;
-                if (res_base < size)
-                        break;
-                base = memblock_align_down(res_base - size, align);
+        for (i = 0; i < MAX_NUMNODES; i++) {
+                get_pfn_range_for_nid(i, &start_pfn, &end_pfn);
+                if (start < PFN_PHYS(start_pfn) || start >= PFN_PHYS(end_pfn))
+                        continue;
+                *nid = i;
+                return min(end, PFN_PHYS(end_pfn));
         }
+#endif
+        *nid = 0;
 
-        return ~(u64)0;
+        return end;
 }
 
-static u64 __init memblock_alloc_nid_region(struct memblock_property *mp,
-                                       u64 (*nid_range)(u64, u64, int *),
-                                       u64 size, u64 align, int nid)
+static phys_addr_t __init memblock_alloc_nid_region(struct memblock_region *mp,
+                                               phys_addr_t size,
+                                               phys_addr_t align, int nid)
 {
-        u64 start, end;
+        phys_addr_t start, end;
 
         start = mp->base;
         end = start + mp->size;
 
         start = memblock_align_up(start, align);
         while (start < end) {
-                u64 this_end;
+                phys_addr_t this_end;
                 int this_nid;
 
-                this_end = nid_range(start, end, &this_nid);
+                this_end = memblock_nid_range(start, end, &this_nid);
                 if (this_nid == nid) {
-                        u64 ret = memblock_alloc_nid_unreserved(start, this_end,
-                                                           size, align);
-                        if (ret != ~(u64)0)
+                        phys_addr_t ret = memblock_find_region(start, this_end, size, align);
+                        if (ret != MEMBLOCK_ERROR &&
+                            !memblock_add_region(&memblock.reserved, ret, size))
                                 return ret;
                 }
                 start = this_end;
         }
 
-        return ~(u64)0;
+        return MEMBLOCK_ERROR;
 }
 
-u64 __init memblock_alloc_nid(u64 size, u64 align, int nid,
-                         u64 (*nid_range)(u64 start, u64 end, int *nid))
+phys_addr_t __init memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid)
 {
-        struct memblock_region *mem = &memblock.memory;
+        struct memblock_type *mem = &memblock.memory;
         int i;
 
         BUG_ON(0 == size);
 
+        /* 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);
 
+        /* We do a bottom-up search for a region with the right
+         * nid since that's easier considering how memblock_nid_range()
+         * works
+         */
         for (i = 0; i < mem->cnt; i++) {
-                u64 ret = memblock_alloc_nid_region(&mem->region[i],
-                                               nid_range,
+                phys_addr_t ret = memblock_alloc_nid_region(&mem->regions[i],
                                                size, align, nid);
-                if (ret != ~(u64)0)
+                if (ret != MEMBLOCK_ERROR)
                         return ret;
         }
 
-        return memblock_alloc(size, align);
-}
-
-u64 __init memblock_alloc(u64 size, u64 align)
-{
-        return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE);
+        return 0;
 }
 
-u64 __init memblock_alloc_base(u64 size, u64 align, u64 max_addr)
+phys_addr_t __init memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid)
 {
-        u64 alloc;
+        phys_addr_t res = memblock_alloc_nid(size, align, nid);
 
-        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;
+        if (res)
+                return res;
+        return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE);
 }
 
-u64 __init __memblock_alloc_base(u64 size, u64 align, u64 max_addr)
-{
-        long i, j;
-        u64 base = 0;
-        u64 res_base;
-
-        BUG_ON(0 == size);
-
-        size = memblock_align_up(size, align);
-
-        /* On some platforms, make sure we allocate lowmem */
-        /* Note that MEMBLOCK_REAL_LIMIT may be MEMBLOCK_ALLOC_ANYWHERE */
-        if (max_addr == MEMBLOCK_ALLOC_ANYWHERE)
-                max_addr = MEMBLOCK_REAL_LIMIT;
 
-        for (i = memblock.memory.cnt - 1; i >= 0; i--) {
-                u64 memblockbase = memblock.memory.region[i].base;
-                u64 memblocksize = memblock.memory.region[i].size;
-
-                if (memblocksize < size)
-                        continue;
-                if (max_addr == MEMBLOCK_ALLOC_ANYWHERE)
-                        base = memblock_align_down(memblockbase + memblocksize - size, align);
-                else if (memblockbase < max_addr) {
-                        base = min(memblockbase + memblocksize, max_addr);
-                        base = memblock_align_down(base - size, align);
-                } else
-                        continue;
-
-                while (base && memblockbase <= base) {
-                        j = memblock_overlaps_region(&memblock.reserved, base, size);
-                        if (j < 0) {
-                                /* this area isn't reserved, take it */
-                                if (memblock_add_region(&memblock.reserved, base, size) < 0)
-                                        return 0;
-                                return base;
-                        }
-                        res_base = memblock.reserved.region[j].base;
-                        if (res_base < size)
-                                break;
-                        base = memblock_align_down(res_base - size, align);
-                }
-        }
-        return 0;
-}
+/*
+ * Remaining API functions
+ */
 
 /* You must call memblock_analyze() before this. */
-u64 __init memblock_phys_mem_size(void)
+phys_addr_t __init memblock_phys_mem_size(void)
 {
-        return memblock.memory.size;
+        return memblock.memory_size;
 }
 
-u64 memblock_end_of_DRAM(void)
+phys_addr_t __init_memblock memblock_end_of_DRAM(void)
 {
         int idx = memblock.memory.cnt - 1;
 
-        return (memblock.memory.region[idx].base + memblock.memory.region[idx].size);
+        return (memblock.memory.regions[idx].base + memblock.memory.regions[idx].size);
 }
 
 /* You must call memblock_analyze() after this. */
-void __init memblock_enforce_memory_limit(u64 memory_limit)
+void __init memblock_enforce_memory_limit(phys_addr_t memory_limit)
 {
         unsigned long i;
-        u64 limit;
-        struct memblock_property *p;
+        phys_addr_t limit;
+        struct memblock_region *p;
 
         if (!memory_limit)
                 return;
@@ -458,24 +646,21 @@ void __init memblock_enforce_memory_limit(u64 memory_limit)
         /* Truncate the memblock regions to satisfy the memory limit. */
         limit = memory_limit;
         for (i = 0; i < memblock.memory.cnt; i++) {
-                if (limit > memblock.memory.region[i].size) {
-                        limit -= memblock.memory.region[i].size;
+                if (limit > memblock.memory.regions[i].size) {
+                        limit -= memblock.memory.regions[i].size;
                         continue;
                 }
 
-                memblock.memory.region[i].size = limit;
+                memblock.memory.regions[i].size = limit;
                 memblock.memory.cnt = i + 1;
                 break;
         }
 
-        if (memblock.memory.region[0].size < memblock.rmo_size)
-                memblock.rmo_size = memblock.memory.region[0].size;
-
         memory_limit = memblock_end_of_DRAM();
 
         /* And truncate any reserves above the limit also. */
         for (i = 0; i < memblock.reserved.cnt; i++) {
-                p = &memblock.reserved.region[i];
+                p = &memblock.reserved.regions[i];
 
                 if (p->base > memory_limit)
                         p->size = 0;
@@ -489,53 +674,190 @@ void __init memblock_enforce_memory_limit(u64 memory_limit)
         }
 }
 
-int __init memblock_is_reserved(u64 addr)
+static int __init_memblock memblock_search(struct memblock_type *type, phys_addr_t addr)
+{
+        unsigned int left = 0, right = type->cnt;
+
+        do {
+                unsigned int mid = (right + left) / 2;
+
+                if (addr < type->regions[mid].base)
+                        right = mid;
+                else if (addr >= (type->regions[mid].base +
+                                  type->regions[mid].size))
+                        left = mid + 1;
+                else
+                        return mid;
+        } while (left < right);
+        return -1;
+}
+
+int __init memblock_is_reserved(phys_addr_t addr)
+{
+        return memblock_search(&memblock.reserved, addr) != -1;
+}
+
+int __init_memblock memblock_is_memory(phys_addr_t addr)
+{
+        return memblock_search(&memblock.memory, addr) != -1;
+}
+
+int __init_memblock memblock_is_region_memory(phys_addr_t base, phys_addr_t size)
+{
+        int idx = memblock_search(&memblock.memory, base);
+
+        if (idx == -1)
+                return 0;
+        return memblock.memory.regions[idx].base <= base &&
+                (memblock.memory.regions[idx].base +
+                 memblock.memory.regions[idx].size) >= (base + size);
+}
+
+int __init_memblock memblock_is_region_reserved(phys_addr_t base, phys_addr_t size)
+{
+        return memblock_overlaps_region(&memblock.reserved, base, size) >= 0;
+}
+
+
+void __init_memblock memblock_set_current_limit(phys_addr_t limit)
+{
+        memblock.current_limit = limit;
+}
+
+static void __init_memblock memblock_dump(struct memblock_type *region, char *name)
 {
+        unsigned long long base, size;
         int i;
 
-        for (i = 0; i < memblock.reserved.cnt; i++) {
-                u64 upper = memblock.reserved.region[i].base +
-                        memblock.reserved.region[i].size - 1;
-                if ((addr >= memblock.reserved.region[i].base) && (addr <= upper))
-                        return 1;
+        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[%#x]\t[%#016llx-%#016llx], %#llx bytes\n",
+                    name, i, base, base + size - 1, size);
         }
-        return 0;
 }
 
-int memblock_is_region_reserved(u64 base, u64 size)
+void __init_memblock memblock_dump_all(void)
 {
-        return memblock_overlaps_region(&memblock.reserved, base, size) >= 0;
+        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");
 }
 
-/*
- * Given a <base, len>, find which memory regions belong to this range.
- * Adjust the request and return a contiguous chunk.
- */
-int memblock_find(struct memblock_property *res)
+void __init memblock_analyze(void)
 {
         int i;
-        u64 rstart, rend;
 
-        rstart = res->base;
-        rend = rstart + res->size - 1;
+        /* 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);
 
-        for (i = 0; i < memblock.memory.cnt; i++) {
-                u64 start = memblock.memory.region[i].base;
-                u64 end = start + memblock.memory.region[i].size - 1;
+        memblock.memory_size = 0;
 
-                if (start > rend)
-                        return -1;
+        for (i = 0; i < memblock.memory.cnt; i++)
+                memblock.memory_size += memblock.memory.regions[i].size;
+
+        /* We allow resizing from there */
+        memblock_can_resize = 1;
+}
+
+void __init memblock_init(void)
+{
+        static int init_done __initdata = 0;
+
+        if (init_done)
+                return;
+        init_done = 1;
+
+        /* Hookup the initial arrays */
+        memblock.memory.regions = memblock_memory_init_regions;
+        memblock.memory.max             = INIT_MEMBLOCK_REGIONS;
+        memblock.reserved.regions       = memblock_reserved_init_regions;
+        memblock.reserved.max   = INIT_MEMBLOCK_REGIONS;
+
+        /* Write a marker in the unused last array entry */
+        memblock.memory.regions[INIT_MEMBLOCK_REGIONS].base = (phys_addr_t)RED_INACTIVE;
+        memblock.reserved.regions[INIT_MEMBLOCK_REGIONS].base = (phys_addr_t)RED_INACTIVE;
+
+        /* Create a dummy zero size MEMBLOCK which will get coalesced away later.
+         * This simplifies the memblock_add() code below...
+         */
+        memblock.memory.regions[0].base = 0;
+        memblock.memory.regions[0].size = 0;
+        memblock.memory.cnt = 1;
+
+        /* Ditto. */
+        memblock.reserved.regions[0].base = 0;
+        memblock.reserved.regions[0].size = 0;
+        memblock.reserved.cnt = 1;
+
+        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);
+
+#if defined(CONFIG_DEBUG_FS) && !defined(ARCH_DISCARD_MEMBLOCK)
+
+static int memblock_debug_show(struct seq_file *m, void *private)
+{
+        struct memblock_type *type = m->private;
+        struct memblock_region *reg;
+        int i;
+
+        for (i = 0; i < type->cnt; i++) {
+                reg = &type->regions[i];
+                seq_printf(m, "%4d: ", i);
+                if (sizeof(phys_addr_t) == 4)
+                        seq_printf(m, "0x%08lx..0x%08lx\n",
+                                   (unsigned long)reg->base,
+                                   (unsigned long)(reg->base + reg->size - 1));
+                else
+                        seq_printf(m, "0x%016llx..0x%016llx\n",
+                                   (unsigned long long)reg->base,
+                                   (unsigned long long)(reg->base + reg->size - 1));
 
-                if ((end >= rstart) && (start < rend)) {
-                        /* adjust the request */
-                        if (rstart < start)
-                                rstart = start;
-                        if (rend > end)
-                                rend = end;
-                        res->base = rstart;
-                        res->size = rend - rstart + 1;
-                        return 0;
-                }
         }
-        return -1;
+        return 0;
+}
+
+static int memblock_debug_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, memblock_debug_show, inode->i_private);
 }
+
+static const struct file_operations memblock_debug_fops = {
+        .open = memblock_debug_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
+
+static int __init memblock_init_debugfs(void)
+{
+        struct dentry *root = debugfs_create_dir("memblock", NULL);
+        if (!root)
+                return -ENXIO;
+        debugfs_create_file("memory", S_IRUGO, root, &memblock.memory, &memblock_debug_fops);
+        debugfs_create_file("reserved", S_IRUGO, root, &memblock.reserved, &memblock_debug_fops);
+
+        return 0;
+}
+__initcall(memblock_init_debugfs);
+
+#endif /* CONFIG_DEBUG_FS */