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Date: Tue, 3 Feb 2015 14:38:02 -0800
From: Tony Luck <tony.luck@...el.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, linux-mm@...r.kernel.org
Subject: [RFC 2/3] mm/memblock: Allocate boot time data structures from
mirrored memory
Try to allocate all boot time kernel data structures from mirrored
memory. If we run out of mirrored memory print warnings, but fall
back to using non-mirrored memory to make sure that we still boot.
Signed-off-by: Tony Luck <tony.luck@...el.com>
---
include/linux/memblock.h | 8 ++++++
mm/memblock.c | 72 +++++++++++++++++++++++++++++++++++++++++-------
mm/nobootmem.c | 10 ++++++-
3 files changed, 79 insertions(+), 11 deletions(-)
diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index 8a036cc6cdd5..03c2b91db474 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -22,6 +22,7 @@
/* Definition of memblock flags. */
#define MEMBLOCK_HOTPLUG 0x1 /* hotpluggable region */
+#define MEMBLOCK_MIRROR 0x2 /* mirrored region */
struct memblock_region {
phys_addr_t base;
@@ -75,6 +76,8 @@ int memblock_reserve(phys_addr_t base, phys_addr_t size);
void memblock_trim_memory(phys_addr_t align);
int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size);
int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size);
+int memblock_mark_mirror(phys_addr_t base, phys_addr_t size);
+u32 memblock_has_mirror(void);
/* Low level functions */
int memblock_add_range(struct memblock_type *type,
@@ -155,6 +158,11 @@ static inline bool movable_node_is_enabled(void)
}
#endif
+static inline bool memblock_is_mirror(struct memblock_region *m)
+{
+ return m->flags & MEMBLOCK_MIRROR;
+}
+
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn,
unsigned long *end_pfn);
diff --git a/mm/memblock.c b/mm/memblock.c
index 3c8db6d84a32..e0826ff5f59b 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -54,10 +54,16 @@ int memblock_debug __initdata_memblock;
#ifdef CONFIG_MOVABLE_NODE
bool movable_node_enabled __initdata_memblock = false;
#endif
+static bool memblock_have_mirror __initdata_memblock = false;
static int memblock_can_resize __initdata_memblock;
static int memblock_memory_in_slab __initdata_memblock = 0;
static int memblock_reserved_in_slab __initdata_memblock = 0;
+u32 __init_memblock memblock_has_mirror(void)
+{
+ return memblock_have_mirror ? MEMBLOCK_MIRROR : 0;
+}
+
/* inline so we don't get a warning when pr_debug is compiled out */
static __init_memblock const char *
memblock_type_name(struct memblock_type *type)
@@ -247,7 +253,6 @@ phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t size,
* @end: end of candidate range, can be %MEMBLOCK_ALLOC_{ANYWHERE|ACCESSIBLE}
* @size: size of free area to find
* @align: alignment of free area to find
- * @flag: pick from blocks based on memory attributes
*
* Find @size free area aligned to @align in the specified range.
*
@@ -258,8 +263,19 @@ phys_addr_t __init_memblock memblock_find_in_range(phys_addr_t start,
phys_addr_t end, phys_addr_t size,
phys_addr_t align)
{
- return memblock_find_in_range_node(size, align, start, end,
+ phys_addr_t ret;
+ u32 flag = memblock_has_mirror();
+
+ ret = memblock_find_in_range_node(size, align, start, end,
+ NUMA_NO_NODE, flag);
+
+ if (!ret && flag) {
+ pr_warn("Could not allocate %lld bytes of mirrored memory\n", size);
+ ret = memblock_find_in_range_node(size, align, start, end,
NUMA_NO_NODE, 0);
+ }
+
+ return ret;
}
static void __init_memblock memblock_remove_region(struct memblock_type *type, unsigned long r)
@@ -771,6 +787,21 @@ int __init_memblock memblock_clear_hotplug(phys_addr_t base, phys_addr_t size)
}
/**
+ * memblock_mark_mirror - Mark mirrored memory with flag MEMBLOCK_MIRROR.
+ * @base: the base phys addr of the region
+ * @size: the size of the region
+ *
+ * Return 0 on succees, -errno on failure.
+ */
+int __init_memblock memblock_mark_mirror(phys_addr_t base, phys_addr_t size)
+{
+ memblock_have_mirror = true;
+
+ return memblock_setclr_flag(base, size, 1, MEMBLOCK_MIRROR);
+}
+
+
+/**
* __next__mem_range - next function for for_each_free_mem_range() etc.
* @idx: pointer to u64 loop variable
* @nid: node selector, %NUMA_NO_NODE for all nodes
@@ -824,6 +855,10 @@ void __init_memblock __next_mem_range(u64 *idx, int nid, u32 flags,
if (movable_node_is_enabled() && memblock_is_hotpluggable(m))
continue;
+ /* if we want mirror memory skip non-mirror memory regions */
+ if ((flags & MEMBLOCK_MIRROR) && !memblock_is_mirror(m))
+ continue;
+
if (!type_b) {
if (out_start)
*out_start = m_start;
@@ -929,6 +964,10 @@ void __init_memblock __next_mem_range_rev(u64 *idx, int nid, u32 flags,
if (movable_node_is_enabled() && memblock_is_hotpluggable(m))
continue;
+ /* if we want mirror memory skip non-mirror memory regions */
+ if ((flags & MEMBLOCK_MIRROR) && !memblock_is_mirror(m))
+ continue;
+
if (!type_b) {
if (out_start)
*out_start = m_start;
@@ -1079,7 +1118,17 @@ static phys_addr_t __init memblock_alloc_base_nid(phys_addr_t size,
phys_addr_t __init memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid)
{
- return memblock_alloc_base_nid(size, align, MEMBLOCK_ALLOC_ACCESSIBLE, nid, 0);
+ u32 flag = memblock_has_mirror();
+ phys_addr_t ret;
+
+again:
+ ret = memblock_alloc_base_nid(size, align, MEMBLOCK_ALLOC_ACCESSIBLE, nid, flag);
+
+ if (!ret && flag) {
+ flag = 0;
+ goto again;
+ }
+ return ret;
}
phys_addr_t __init __memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
@@ -1148,6 +1197,7 @@ static void * __init memblock_virt_alloc_internal(
{
phys_addr_t alloc;
void *ptr;
+ u32 flag = memblock_has_mirror();
if (WARN_ONCE(nid == MAX_NUMNODES, "Usage of MAX_NUMNODES is deprecated. Use NUMA_NO_NODE instead\n"))
nid = NUMA_NO_NODE;
@@ -1168,13 +1218,13 @@ static void * __init memblock_virt_alloc_internal(
again:
alloc = memblock_find_in_range_node(size, align, min_addr, max_addr,
- nid, 0);
+ nid, flag);
if (alloc)
goto done;
if (nid != NUMA_NO_NODE) {
alloc = memblock_find_in_range_node(size, align, min_addr,
- max_addr, NUMA_NO_NODE, 0);
+ max_addr, NUMA_NO_NODE, flag);
if (alloc)
goto done;
}
@@ -1182,10 +1232,15 @@ again:
if (min_addr) {
min_addr = 0;
goto again;
- } else {
- goto error;
}
+ if (flag) {
+ flag = 0;
+ pr_warn("Could not allocate %lld bytes of mirrored memory\n", size);
+ goto again;
+ }
+
+ return NULL;
done:
memblock_reserve(alloc, size);
ptr = phys_to_virt(alloc);
@@ -1200,9 +1255,6 @@ done:
kmemleak_alloc(ptr, size, 0, 0);
return ptr;
-
-error:
- return NULL;
}
/**
diff --git a/mm/nobootmem.c b/mm/nobootmem.c
index a4903046bcba..35423c935a46 100644
--- a/mm/nobootmem.c
+++ b/mm/nobootmem.c
@@ -37,11 +37,19 @@ static void * __init __alloc_memory_core_early(int nid, u64 size, u64 align,
{
void *ptr;
u64 addr;
+ u32 flag = memblock_has_mirror();
if (limit > memblock.current_limit)
limit = memblock.current_limit;
- addr = memblock_find_in_range_node(size, align, goal, limit, nid, 0);
+again:
+ addr = memblock_find_in_range_node(size, align, goal, limit, nid, flag);
+
+ if (flag && !addr) {
+ flag = 0;
+ pr_warn("Could not allocate %lld bytes of mirrored memory\n", size);
+ goto again;
+ }
if (!addr)
return NULL;
--
2.1.0
--
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