mm/memblock: add memblock memory allocation apis

Introduce memblock memory allocation APIs which allow to support PAE or
LPAE extension on 32 bits archs where the physical memory start address
can be beyond 4GB.  In such cases, existing bootmem APIs which operate
on 32 bit addresses won't work and needs memblock layer which operates
on 64 bit addresses.

So we add equivalent APIs so that we can replace usage of bootmem with
memblock interfaces.  Architectures already converted to NO_BOOTMEM use
these new memblock interfaces.  The architectures which are still not
converted to NO_BOOTMEM continue to function as is because we still
maintain the fal lback option of bootmem back-end supporting these new
interfaces.  So no functional change as such.

In long run, once all the architectures moves to NO_BOOTMEM, we can get
rid of bootmem layer completely.  This is one step to remove the core
code dependency with bootmem and also gives path for architectures to
move away from bootmem.

The proposed interface will became active if both CONFIG_HAVE_MEMBLOCK
and CONFIG_NO_BOOTMEM are specified by arch.  In case
!CONFIG_NO_BOOTMEM, the memblock() wrappers will fallback to the
existing bootmem apis so that arch's not converted to NO_BOOTMEM
continue to work as is.

The meaning of MEMBLOCK_ALLOC_ACCESSIBLE and MEMBLOCK_ALLOC_ANYWHERE
is kept same.

[akpm@linux-foundation.org: s/depricated/deprecated/]
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Paul Walmsley <paul@pwsan.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Tony Lindgren <tony@atomide.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 152 insertions, 0 deletions

diff --git a/include/linux/bootmem.h b/include/linux/bootmem.h
index 55d52fb7ac1d..2fae55def608 100644
--- a/include/linux/bootmem.h
+++ b/include/linux/bootmem.h
@@ -5,6 +5,7 @@
 #define _LINUX_BOOTMEM_H
 
 #include <linux/mmzone.h>
+#include <linux/mm_types.h>
 #include <asm/dma.h>
 
 /*
@@ -141,6 +142,157 @@ extern void *__alloc_bootmem_low_node(pg_data_t *pgdat,
 #define alloc_bootmem_low_pages_node(pgdat, x) \
         __alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
 
+
+#if defined(CONFIG_HAVE_MEMBLOCK) && defined(CONFIG_NO_BOOTMEM)
+
+/* FIXME: use MEMBLOCK_ALLOC_* variants here */
+#define BOOTMEM_ALLOC_ACCESSIBLE        0
+#define BOOTMEM_ALLOC_ANYWHERE          (~(phys_addr_t)0)
+
+/* FIXME: Move to memblock.h at a point where we remove nobootmem.c */
+void *memblock_virt_alloc_try_nid_nopanic(phys_addr_t size,
+                phys_addr_t align, phys_addr_t min_addr,
+                phys_addr_t max_addr, int nid);
+void *memblock_virt_alloc_try_nid(phys_addr_t size, phys_addr_t align,
+                phys_addr_t min_addr, phys_addr_t max_addr, int nid);
+void __memblock_free_early(phys_addr_t base, phys_addr_t size);
+void __memblock_free_late(phys_addr_t base, phys_addr_t size);
+
+static inline void * __init memblock_virt_alloc(
+                                        phys_addr_t size,  phys_addr_t align)
+{
+        return memblock_virt_alloc_try_nid(size, align, BOOTMEM_LOW_LIMIT,
+                                            BOOTMEM_ALLOC_ACCESSIBLE,
+                                            NUMA_NO_NODE);
+}
+
+static inline void * __init memblock_virt_alloc_nopanic(
+                                        phys_addr_t size, phys_addr_t align)
+{
+        return memblock_virt_alloc_try_nid_nopanic(size, align,
+                                                    BOOTMEM_LOW_LIMIT,
+                                                    BOOTMEM_ALLOC_ACCESSIBLE,
+                                                    NUMA_NO_NODE);
+}
+
+static inline void * __init memblock_virt_alloc_from_nopanic(
+                phys_addr_t size, phys_addr_t align, phys_addr_t min_addr)
+{
+        return memblock_virt_alloc_try_nid_nopanic(size, align, min_addr,
+                                                    BOOTMEM_ALLOC_ACCESSIBLE,
+                                                    NUMA_NO_NODE);
+}
+
+static inline void * __init memblock_virt_alloc_node(
+                                                phys_addr_t size, int nid)
+{
+        return memblock_virt_alloc_try_nid(size, 0, BOOTMEM_LOW_LIMIT,
+                                            BOOTMEM_ALLOC_ACCESSIBLE, nid);
+}
+
+static inline void * __init memblock_virt_alloc_node_nopanic(
+                                                phys_addr_t size, int nid)
+{
+        return memblock_virt_alloc_try_nid_nopanic(size, 0, BOOTMEM_LOW_LIMIT,
+                                                    BOOTMEM_ALLOC_ACCESSIBLE,
+                                                    nid);
+}
+
+static inline void __init memblock_free_early(
+                                        phys_addr_t base, phys_addr_t size)
+{
+        __memblock_free_early(base, size);
+}
+
+static inline void __init memblock_free_early_nid(
+                                phys_addr_t base, phys_addr_t size, int nid)
+{
+        __memblock_free_early(base, size);
+}
+
+static inline void __init memblock_free_late(
+                                        phys_addr_t base, phys_addr_t size)
+{
+        __memblock_free_late(base, size);
+}
+
+#else
+
+#define BOOTMEM_ALLOC_ACCESSIBLE        0
+
+
+/* Fall back to all the existing bootmem APIs */
+static inline void * __init memblock_virt_alloc(
+                                        phys_addr_t size,  phys_addr_t align)
+{
+        if (!align)
+                align = SMP_CACHE_BYTES;
+        return __alloc_bootmem(size, align, BOOTMEM_LOW_LIMIT);
+}
+
+static inline void * __init memblock_virt_alloc_nopanic(
+                                        phys_addr_t size, phys_addr_t align)
+{
+        if (!align)
+                align = SMP_CACHE_BYTES;
+        return __alloc_bootmem_nopanic(size, align, BOOTMEM_LOW_LIMIT);
+}
+
+static inline void * __init memblock_virt_alloc_from_nopanic(
+                phys_addr_t size, phys_addr_t align, phys_addr_t min_addr)
+{
+        return __alloc_bootmem_nopanic(size, align, min_addr);
+}
+
+static inline void * __init memblock_virt_alloc_node(
+                                                phys_addr_t size, int nid)
+{
+        return __alloc_bootmem_node(NODE_DATA(nid), size, SMP_CACHE_BYTES,
+                                     BOOTMEM_LOW_LIMIT);
+}
+
+static inline void * __init memblock_virt_alloc_node_nopanic(
+                                                phys_addr_t size, int nid)
+{
+        return __alloc_bootmem_node_nopanic(NODE_DATA(nid), size,
+                                             SMP_CACHE_BYTES,
+                                             BOOTMEM_LOW_LIMIT);
+}
+
+static inline void * __init memblock_virt_alloc_try_nid(phys_addr_t size,
+        phys_addr_t align, phys_addr_t min_addr, phys_addr_t max_addr, int nid)
+{
+        return __alloc_bootmem_node_high(NODE_DATA(nid), size, align,
+                                          min_addr);
+}
+
+static inline void * __init memblock_virt_alloc_try_nid_nopanic(
+                        phys_addr_t size, phys_addr_t align,
+                        phys_addr_t min_addr, phys_addr_t max_addr, int nid)
+{
+        return ___alloc_bootmem_node_nopanic(NODE_DATA(nid), size, align,
+                                min_addr, max_addr);
+}
+
+static inline void __init memblock_free_early(
+                                        phys_addr_t base, phys_addr_t size)
+{
+        free_bootmem(base, size);
+}
+
+static inline void __init memblock_free_early_nid(
+                                phys_addr_t base, phys_addr_t size, int nid)
+{
+        free_bootmem_node(NODE_DATA(nid), base, size);
+}
+
+static inline void __init memblock_free_late(
+                                        phys_addr_t base, phys_addr_t size)
+{
+        free_bootmem_late(base, size);
+}
+#endif /* defined(CONFIG_HAVE_MEMBLOCK) && defined(CONFIG_NO_BOOTMEM) */
+
 #ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
 extern void *alloc_remap(int nid, unsigned long size);
 #else