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Subject[PATCH 05/49] memblock: Introduce for_each_memblock() and new accessors, and use it
Date
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>

Walk memblock's using for_each_memblock() and use memblock_region_base/end_pfn() for
getting to PFNs. Update sparc, powerpc, microblaze and sh.

Note: This is -almost- a direct conversion. It doesn't fix some existing
crap when/if memblock's aren't page aligned in the first place. This will be
sorted out separately.

This removes memblock_find() as well, which isn't used anymore

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
arch/microblaze/mm/init.c | 18 +++----
arch/powerpc/mm/hash_utils_64.c | 8 ++--
arch/powerpc/mm/mem.c | 92 ++++++++++++++-------------------------
arch/powerpc/mm/numa.c | 17 ++++---
arch/sh/mm/init.c | 16 ++++---
arch/sparc/mm/init_64.c | 30 +++++--------
include/linux/memblock.h | 56 ++++++++++++++++++------
mm/memblock.c | 32 -------------
8 files changed, 117 insertions(+), 152 deletions(-)
diff --git a/arch/microblaze/mm/init.c b/arch/microblaze/mm/init.c
index afd6494..8f45b41 100644
--- a/arch/microblaze/mm/init.c
+++ b/arch/microblaze/mm/init.c
@@ -70,16 +70,16 @@ static void __init paging_init(void)

void __init setup_memory(void)
{
- int i;
unsigned long map_size;
+ struct memblock_region *reg;
+
#ifndef CONFIG_MMU
u32 kernel_align_start, kernel_align_size;

/* Find main memory where is the kernel */
- for (i = 0; i < memblock.memory.cnt; i++) {
- memory_start = (u32) memblock.memory.regions[i].base;
- memory_end = (u32) memblock.memory.regions[i].base
- + (u32) memblock.memory.region[i].size;
+ for_each_memblock(memory, reg) {
+ memory_start = (u32)reg->base;
+ memory_end = (u32) reg->base + reg->size;
if ((memory_start <= (u32)_text) &&
((u32)_text <= memory_end)) {
memory_size = memory_end - memory_start;
@@ -147,12 +147,10 @@ void __init setup_memory(void)
free_bootmem(memory_start, memory_size);

/* reserve allocate blocks */
- for (i = 0; i < memblock.reserved.cnt; i++) {
+ for_each_memblock(reserved, reg) {
pr_debug("reserved %d - 0x%08x-0x%08x\n", i,
- (u32) memblock.reserved.region[i].base,
- (u32) memblock_size_bytes(&memblock.reserved, i));
- reserve_bootmem(memblock.reserved.region[i].base,
- memblock_size_bytes(&memblock.reserved, i) - 1, BOOTMEM_DEFAULT);
+ (u32) reg->base, (u32) reg->size);
+ reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
}
#ifdef CONFIG_MMU
init_bootmem_done = 1;
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index dbaacb7..2b0a807 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -588,7 +588,7 @@ static void __init htab_initialize(void)
unsigned long pteg_count;
unsigned long prot;
unsigned long base = 0, size = 0, limit;
- int i;
+ struct memblock_region *reg;

DBG(" -> htab_initialize()\n");

@@ -659,9 +659,9 @@ static void __init htab_initialize(void)
*/

/* create bolted the linear mapping in the hash table */
- for (i=0; i < memblock.memory.cnt; i++) {
- base = (unsigned long)__va(memblock.memory.regions[i].base);
- size = memblock.memory.region[i].size;
+ for_each_memblock(memory, reg) {
+ base = (unsigned long)__va(reg->base);
+ size = reg->size;

DBG("creating mapping for region: %lx..%lx (prot: %lx)\n",
base, size, prot);
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index a33f5c1..52df542 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -82,18 +82,11 @@ int page_is_ram(unsigned long pfn)
return pfn < max_pfn;
#else
unsigned long paddr = (pfn << PAGE_SHIFT);
- int i;
- for (i=0; i < memblock.memory.cnt; i++) {
- unsigned long base;
+ struct memblock_region *reg;

- base = memblock.memory.regions[i].base;
-
- if ((paddr >= base) &&
- (paddr < (base + memblock.memory.regions[i].size))) {
+ for_each_memblock(memory, reg)
+ if (paddr >= reg->base && paddr < (reg->base + reg->size))
return 1;
- }
- }
-
return 0;
#endif
}
@@ -149,23 +142,19 @@ int
walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
void *arg, int (*func)(unsigned long, unsigned long, void *))
{
- struct memblock_region res;
- unsigned long pfn, len;
- u64 end;
+ struct memblock_region *reg;
+ unsigned long end_pfn = start_pfn + nr_pages;
+ unsigned long tstart, tend;
int ret = -1;

- res.base = (u64) start_pfn << PAGE_SHIFT;
- res.size = (u64) nr_pages << PAGE_SHIFT;
-
- end = res.base + res.size - 1;
- while ((res.base < end) && (memblock_find(&res) >= 0)) {
- pfn = (unsigned long)(res.base >> PAGE_SHIFT);
- len = (unsigned long)(res.size >> PAGE_SHIFT);
- ret = (*func)(pfn, len, arg);
+ for_each_memblock(memory, reg) {
+ tstart = max(start_pfn, memblock_region_base_pfn(reg));
+ tend = min(end_pfn, memblock_region_end_pfn(reg));
+ if (tstart >= tend)
+ continue;
+ ret = (*func)(tstart, tend - tstart, arg);
if (ret)
break;
- res.base += (res.size + 1);
- res.size = (end - res.base + 1);
}
return ret;
}
@@ -179,9 +168,9 @@ EXPORT_SYMBOL_GPL(walk_system_ram_range);
#ifndef CONFIG_NEED_MULTIPLE_NODES
void __init do_init_bootmem(void)
{
- unsigned long i;
unsigned long start, bootmap_pages;
unsigned long total_pages;
+ struct memblock_region *reg;
int boot_mapsize;

max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
@@ -204,10 +193,10 @@ void __init do_init_bootmem(void)
boot_mapsize = init_bootmem_node(NODE_DATA(0), start >> PAGE_SHIFT, min_low_pfn, max_low_pfn);

/* Add active regions with valid PFNs */
- for (i = 0; i < memblock.memory.cnt; i++) {
+ for_each_memblock(memory, reg) {
unsigned long start_pfn, end_pfn;
- start_pfn = memblock.memory.regions[i].base >> PAGE_SHIFT;
- end_pfn = start_pfn + memblock_size_pages(&memblock.memory, i);
+ start_pfn = memblock_region_base_pfn(reg);
+ end_pfn = memblock_region_end_pfn(reg);
add_active_range(0, start_pfn, end_pfn);
}

@@ -218,29 +207,21 @@ void __init do_init_bootmem(void)
free_bootmem_with_active_regions(0, lowmem_end_addr >> PAGE_SHIFT);

/* reserve the sections we're already using */
- for (i = 0; i < memblock.reserved.cnt; i++) {
- unsigned long addr = memblock.reserved.regions[i].base +
- memblock_size_bytes(&memblock.reserved, i) - 1;
- if (addr < lowmem_end_addr)
- reserve_bootmem(memblock.reserved.regions[i].base,
- memblock_size_bytes(&memblock.reserved, i),
- BOOTMEM_DEFAULT);
- else if (memblock.reserved.regions[i].base < lowmem_end_addr) {
- unsigned long adjusted_size = lowmem_end_addr -
- memblock.reserved.regions[i].base;
- reserve_bootmem(memblock.reserved.regions[i].base,
- adjusted_size, BOOTMEM_DEFAULT);
+ for_each_memblock(reserved, reg) {
+ unsigned long top = reg->base + reg->size - 1;
+ if (top < lowmem_end_addr)
+ reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
+ else if (reg->base < lowmem_end_addr) {
+ unsigned long trunc_size = lowmem_end_addr - reg->base;
+ reserve_bootmem(reg->base, trunc_size, BOOTMEM_DEFAULT);
}
}
#else
free_bootmem_with_active_regions(0, max_pfn);

/* reserve the sections we're already using */
- for (i = 0; i < memblock.reserved.cnt; i++)
- reserve_bootmem(memblock.reserved.regions[i].base,
- memblock_size_bytes(&memblock.reserved, i),
- BOOTMEM_DEFAULT);
-
+ for_each_memblock(reserved, reg)
+ reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
#endif
/* XXX need to clip this if using highmem? */
sparse_memory_present_with_active_regions(0);
@@ -251,22 +232,15 @@ void __init do_init_bootmem(void)
/* mark pages that don't exist as nosave */
static int __init mark_nonram_nosave(void)
{
- unsigned long memblock_next_region_start_pfn,
- memblock_region_max_pfn;
- int i;
-
- for (i = 0; i < memblock.memory.cnt - 1; i++) {
- memblock_region_max_pfn =
- (memblock.memory.regions[i].base >> PAGE_SHIFT) +
- (memblock.memory.regions[i].size >> PAGE_SHIFT);
- memblock_next_region_start_pfn =
- memblock.memory.regions[i+1].base >> PAGE_SHIFT;
-
- if (memblock_region_max_pfn < memblock_next_region_start_pfn)
- register_nosave_region(memblock_region_max_pfn,
- memblock_next_region_start_pfn);
+ struct memblock_region *reg, *prev = NULL;
+
+ for_each_memblock(memory, reg) {
+ if (prev &&
+ memblock_region_end_pfn(prev) < memblock_region_base_pfn(reg))
+ register_nosave_region(memblock_region_end_pfn(prev),
+ memblock_region_base_pfn(reg));
+ prev = reg;
}
-
return 0;
}

diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index f473645..9eaaf22 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -746,16 +746,17 @@ static void __init setup_nonnuma(void)
unsigned long top_of_ram = memblock_end_of_DRAM();
unsigned long total_ram = memblock_phys_mem_size();
unsigned long start_pfn, end_pfn;
- unsigned int i, nid = 0;
+ unsigned int nid = 0;
+ struct memblock_region *reg;

printk(KERN_DEBUG "Top of RAM: 0x%lx, Total RAM: 0x%lx\n",
top_of_ram, total_ram);
printk(KERN_DEBUG "Memory hole size: %ldMB\n",
(top_of_ram - total_ram) >> 20);

- for (i = 0; i < memblock.memory.cnt; ++i) {
- start_pfn = memblock.memory.region[i].base >> PAGE_SHIFT;
- end_pfn = start_pfn + memblock_size_pages(&memblock.memory, i);
+ for_each_memblock(memory, reg) {
+ start_pfn = memblock_region_base_pfn(reg);
+ end_pfn = memblock_region_end_pfn(reg);

fake_numa_create_new_node(end_pfn, &nid);
add_active_range(nid, start_pfn, end_pfn);
@@ -891,11 +892,11 @@ static struct notifier_block __cpuinitdata ppc64_numa_nb = {
static void mark_reserved_regions_for_nid(int nid)
{
struct pglist_data *node = NODE_DATA(nid);
- int i;
+ struct memblock_region *reg;

- for (i = 0; i < memblock.reserved.cnt; i++) {
- unsigned long physbase = memblock.reserved.region[i].base;
- unsigned long size = memblock.reserved.region[i].size;
+ for_each_memblock(reserved, reg) {
+ unsigned long physbase = reg->base;
+ unsigned long size = reg->size;
unsigned long start_pfn = physbase >> PAGE_SHIFT;
unsigned long end_pfn = PFN_UP(physbase + size);
struct node_active_region node_ar;
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index d0e2491..da1605a 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -226,11 +226,12 @@ static void __init bootmem_init_one_node(unsigned int nid)
* reservations in other nodes.
*/
if (nid == 0) {
+ struct memblock_region *reg;
+
/* Reserve the sections we're already using. */
- for (i = 0; i < memblock.reserved.cnt; i++)
- reserve_bootmem(memblock.reserved.region[i].base,
- memblock_size_bytes(&memblock.reserved, i),
- BOOTMEM_DEFAULT);
+ for_each_memblock(reserved, reg) {
+ reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
+ }
}

sparse_memory_present_with_active_regions(nid);
@@ -238,13 +239,14 @@ static void __init bootmem_init_one_node(unsigned int nid)

static void __init do_init_bootmem(void)
{
+ struct memblock_region *reg;
int i;

/* Add active regions with valid PFNs. */
- for (i = 0; i < memblock.memory.cnt; i++) {
+ for_each_memblock(memory, reg) {
unsigned long start_pfn, end_pfn;
- start_pfn = memblock.memory.region[i].base >> PAGE_SHIFT;
- end_pfn = start_pfn + memblock_size_pages(&memblock.memory, i);
+ start_pfn = memblock_region_base_pfn(reg);
+ end_pfn = memblock_region_end_pfn(reg);
__add_active_range(0, start_pfn, end_pfn);
}

diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
index 16d8bee..dd68025 100644
--- a/arch/sparc/mm/init_64.c
+++ b/arch/sparc/mm/init_64.c
@@ -972,13 +972,13 @@ int of_node_to_nid(struct device_node *dp)

static void __init add_node_ranges(void)
{
- int i;
+ struct memblock_region *reg;

- for (i = 0; i < memblock.memory.cnt; i++) {
- unsigned long size = memblock_size_bytes(&memblock.memory, i);
+ for_each_memblock(memory, reg) {
+ unsigned long size = reg->size;
unsigned long start, end;

- start = memblock.memory.regions[i].base;
+ start = reg->base;
end = start + size;
while (start < end) {
unsigned long this_end;
@@ -1281,7 +1281,7 @@ static void __init bootmem_init_nonnuma(void)
{
unsigned long top_of_ram = memblock_end_of_DRAM();
unsigned long total_ram = memblock_phys_mem_size();
- unsigned int i;
+ struct memblock_region *reg;

numadbg("bootmem_init_nonnuma()\n");

@@ -1292,15 +1292,14 @@ static void __init bootmem_init_nonnuma(void)

init_node_masks_nonnuma();

- for (i = 0; i < memblock.memory.cnt; i++) {
- unsigned long size = memblock_size_bytes(&memblock.memory, i);
+ for_each_memblock(memory, reg) {
unsigned long start_pfn, end_pfn;

- if (!size)
+ if (!reg->size)
continue;

- start_pfn = memblock.memory.regions[i].base >> PAGE_SHIFT;
- end_pfn = start_pfn + memblock_size_pages(&memblock.memory, i);
+ start_pfn = memblock_region_base_pfn(reg);
+ end_pfn = memblock_region_end_pfn(reg);
add_active_range(0, start_pfn, end_pfn);
}

@@ -1334,17 +1333,12 @@ static void __init reserve_range_in_node(int nid, unsigned long start,

static void __init trim_reserved_in_node(int nid)
{
- int i;
+ struct memblock_region *reg;

numadbg(" trim_reserved_in_node(%d)\n", nid);

- for (i = 0; i < memblock.reserved.cnt; i++) {
- unsigned long start = memblock.reserved.regions[i].base;
- unsigned long size = memblock_size_bytes(&memblock.reserved, i);
- unsigned long end = start + size;
-
- reserve_range_in_node(nid, start, end);
- }
+ for_each_memblock(reserved, reg)
+ reserve_range_in_node(nid, reg->base, reg->base + reg->size);
}

static void __init bootmem_init_one_node(int nid)
diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index 4b69313..d948857 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -58,32 +58,60 @@ extern u64 memblock_end_of_DRAM(void);
extern void __init memblock_enforce_memory_limit(u64 memory_limit);
extern int __init memblock_is_reserved(u64 addr);
extern int memblock_is_region_reserved(u64 base, u64 size);
-extern int memblock_find(struct memblock_region *res);

extern void memblock_dump_all(void);

-static inline u64
-memblock_size_bytes(struct memblock_type *type, unsigned long region_nr)
+/*
+ * pfn conversion functions
+ *
+ * While the memory MEMBLOCKs should always be page aligned, the reserved
+ * MEMBLOCKs may not be. This accessor attempt to provide a very clear
+ * idea of what they return for such non aligned MEMBLOCKs.
+ */
+
+/**
+ * memblock_region_base_pfn - Return the lowest pfn intersecting with the region
+ * @reg: memblock_region structure
+ */
+static inline unsigned long memblock_region_base_pfn(const struct memblock_region *reg)
{
- return type->regions[region_nr].size;
+ return reg->base >> PAGE_SHIFT;
}
-static inline u64
-memblock_size_pages(struct memblock_type *type, unsigned long region_nr)
+
+/**
+ * memblock_region_last_pfn - Return the highest pfn intersecting with the region
+ * @reg: memblock_region structure
+ */
+static inline unsigned long memblock_region_last_pfn(const struct memblock_region *reg)
{
- return memblock_size_bytes(type, region_nr) >> PAGE_SHIFT;
+ return (reg->base + reg->size - 1) >> PAGE_SHIFT;
}
-static inline u64
-memblock_start_pfn(struct memblock_type *type, unsigned long region_nr)
+
+/**
+ * memblock_region_end_pfn - Return the pfn of the first page following the region
+ * but not intersecting it
+ * @reg: memblock_region structure
+ */
+static inline unsigned long memblock_region_end_pfn(const struct memblock_region *reg)
{
- return type->regions[region_nr].base >> PAGE_SHIFT;
+ return memblock_region_last_pfn(reg) + 1;
}
-static inline u64
-memblock_end_pfn(struct memblock_type *type, unsigned long region_nr)
+
+/**
+ * memblock_region_pages - Return the number of pages covering a region
+ * @reg: memblock_region structure
+ */
+static inline unsigned long memblock_region_pages(const struct memblock_region *reg)
{
- return memblock_start_pfn(type, region_nr) +
- memblock_size_pages(type, region_nr);
+ return memblock_region_end_pfn(reg) - memblock_region_end_pfn(reg);
}

+#define for_each_memblock(memblock_type, region) \
+ for (region = memblock.memblock_type.regions; \
+ region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \
+ region++)
+
+
#endif /* __KERNEL__ */

#endif /* _LINUX_MEMBLOCK_H */
diff --git a/mm/memblock.c b/mm/memblock.c
index 13d4a57..5df1400 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -505,35 +505,3 @@ int memblock_is_region_reserved(u64 base, u64 size)
return memblock_overlaps_region(&memblock.reserved, base, size);
}

-/*
- * 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_region *res)
-{
- int i;
- u64 rstart, rend;
-
- rstart = res->base;
- rend = rstart + res->size - 1;
-
- for (i = 0; i < memblock.memory.cnt; i++) {
- u64 start = memblock.memory.regions[i].base;
- u64 end = start + memblock.memory.regions[i].size - 1;
-
- if (start > rend)
- return -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;
-}
--
1.6.4.2


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