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ARM: Add arm_memblock_steal() to allocate memory away from the kernel

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Several platforms are now using the memblock_alloc+memblock_free+
memblock_remove trick to obtain memory which won't be mapped in the
kernel's page tables.  Most platforms do this (correctly) in the
->reserve callback.  However, OMAP has started to call these functions
outside of this callback, and this is extremely unsafe - memory will
not be unmapped, and could well be given out after memblock is no
longer responsible for its management.

So, provide arm_memblock_steal() to perform this function, and ensure
that it panic()s if it is used inappropriately.  Convert everyone
over, including OMAP.

As a result, OMAP with OMAP4_ERRATA_I688 enabled will panic on boot
with this change.  Mark this option as BROKEN and make it depend on
BROKEN.  OMAP needs to be fixed, or 137d105d50 (ARM: OMAP4: Fix
errata i688 with MPU interconnect barriers.) reverted until such
time it can be fixed correctly.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2012-01-13 15:00:51 +00:00
parent 4de3a8e101
commit 716a3dc200
9 changed files with 34 additions and 32 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
arch/arm/include/asm/memblock.h
View file

@ -6,4 +6,6 @@ struct machine_desc;
extern void arm_memblock_init(struct meminfo *, struct machine_desc *);
phys_addr_t arm_memblock_steal(phys_addr_t size, phys_addr_t align);
#endif

5
arch/arm/mach-imx/mach-mx31_3ds.c
View file

@ -36,6 +36,7 @@
#include <asm/mach/time.h>
#include <asm/memory.h>
#include <asm/mach/map.h>
#include <asm/memblock.h>
#include <mach/common.h>
#include <mach/iomux-mx3.h>
#include <mach/3ds_debugboard.h>
@ -754,10 +755,8 @@ static struct sys_timer mx31_3ds_timer = {
static void __init mx31_3ds_reserve(void)
{
/* reserve MX31_3DS_CAMERA_BUF_SIZE bytes for mx3-camera */
mx3_camera_base = memblock_alloc(MX31_3DS_CAMERA_BUF_SIZE,
mx3_camera_base = arm_memblock_steal(MX31_3DS_CAMERA_BUF_SIZE,
MX31_3DS_CAMERA_BUF_SIZE);
memblock_free(mx3_camera_base, MX31_3DS_CAMERA_BUF_SIZE);
memblock_remove(mx3_camera_base, MX31_3DS_CAMERA_BUF_SIZE);
}
MACHINE_START(MX31_3DS, "Freescale MX31PDK (3DS)")

5
arch/arm/mach-imx/mach-mx31moboard.c
View file

@ -41,6 +41,7 @@
#include <asm/mach/arch.h>
#include <asm/mach/time.h>
#include <asm/mach/map.h>
#include <asm/memblock.h>
#include <mach/board-mx31moboard.h>
#include <mach/common.h>
#include <mach/hardware.h>
@ -584,10 +585,8 @@ struct sys_timer mx31moboard_timer = {
static void __init mx31moboard_reserve(void)
{
/* reserve 4 MiB for mx3-camera */
mx3_camera_base = memblock_alloc(MX3_CAMERA_BUF_SIZE,
mx3_camera_base = arm_memblock_steal(MX3_CAMERA_BUF_SIZE,
MX3_CAMERA_BUF_SIZE);
memblock_free(mx3_camera_base, MX3_CAMERA_BUF_SIZE);
memblock_remove(mx3_camera_base, MX3_CAMERA_BUF_SIZE);
}
MACHINE_START(MX31MOBOARD, "EPFL Mobots mx31moboard")

5
arch/arm/mach-imx/mach-pcm037.c
View file

@ -39,6 +39,7 @@
#include <asm/mach/arch.h>
#include <asm/mach/time.h>
#include <asm/mach/map.h>
#include <asm/memblock.h>
#include <mach/common.h>
#include <mach/hardware.h>
#include <mach/iomux-mx3.h>
@ -680,10 +681,8 @@ struct sys_timer pcm037_timer = {
static void __init pcm037_reserve(void)
{
/* reserve 4 MiB for mx3-camera */
mx3_camera_base = memblock_alloc(MX3_CAMERA_BUF_SIZE,
mx3_camera_base = arm_memblock_steal(MX3_CAMERA_BUF_SIZE,
MX3_CAMERA_BUF_SIZE);
memblock_free(mx3_camera_base, MX3_CAMERA_BUF_SIZE);
memblock_remove(mx3_camera_base, MX3_CAMERA_BUF_SIZE);
}
MACHINE_START(PCM037, "Phytec Phycore pcm037")

4
arch/arm/mach-omap2/Kconfig
View file

@ -366,8 +366,8 @@ config OMAP3_SDRC_AC_TIMING
going on could result in system crashes;
config OMAP4_ERRATA_I688
bool "OMAP4 errata: Async Bridge Corruption"
depends on ARCH_OMAP4
bool "OMAP4 errata: Async Bridge Corruption (BROKEN)"
depends on ARCH_OMAP4 && BROKEN
select ARCH_HAS_BARRIERS
help
If a data is stalled inside asynchronous bridge because of back

13
arch/arm/mach-omap2/omap-secure.c
View file

@ -16,6 +16,7 @@
#include <linux/memblock.h>
#include <asm/cacheflush.h>
#include <asm/memblock.h>
#include <mach/omap-secure.h>
@ -57,20 +58,10 @@ u32 omap_secure_dispatcher(u32 idx, u32 flag, u32 nargs, u32 arg1, u32 arg2,
/* Allocate the memory to save secure ram */
int __init omap_secure_ram_reserve_memblock(void)
{
phys_addr_t paddr;
u32 size = OMAP_SECURE_RAM_STORAGE;
size = ALIGN(size, SZ_1M);
paddr = memblock_alloc(size, SZ_1M);
if (!paddr) {
pr_err("%s: failed to reserve %x bytes\n",
__func__, size);
return -ENOMEM;
}
memblock_free(paddr, size);
memblock_remove(paddr, size);
omap_secure_memblock_base = paddr;
omap_secure_memblock_base = arm_memblock_steal(size, SZ_1M);
return 0;
}

10
arch/arm/mach-omap2/omap4-common.c
View file

@ -20,6 +20,7 @@
#include <asm/hardware/gic.h>
#include <asm/hardware/cache-l2x0.h>
#include <asm/mach/map.h>
#include <asm/memblock.h>
#include <plat/irqs.h>
#include <plat/sram.h>
@ -61,13 +62,8 @@ static int __init omap_barriers_init(void)
return -ENODEV;
size = ALIGN(PAGE_SIZE, SZ_1M);
paddr = memblock_alloc(size, SZ_1M);
if (!paddr) {
pr_err("%s: failed to reserve 4 Kbytes\n", __func__);
return -ENOMEM;
}
memblock_free(paddr, size);
memblock_remove(paddr, size);
paddr = arm_memblock_steal(size, SZ_1M);
dram_io_desc[0].virtual = OMAP4_DRAM_BARRIER_VA;
dram_io_desc[0].pfn = __phys_to_pfn(paddr);
dram_io_desc[0].length = size;

17
arch/arm/mm/init.c
View file

@ -22,6 +22,7 @@
#include <linux/memblock.h>
#include <asm/mach-types.h>
#include <asm/memblock.h>
#include <asm/prom.h>
#include <asm/sections.h>
#include <asm/setup.h>
@ -307,6 +308,21 @@ static void arm_memory_present(void)
}
#endif
static bool arm_memblock_steal_permitted = true;
phys_addr_t arm_memblock_steal(phys_addr_t size, phys_addr_t align)
{
phys_addr_t phys;
BUG_ON(!arm_memblock_steal_permitted);
phys = memblock_alloc(size, align);
memblock_free(phys, size);
memblock_remove(phys, size);
return phys;
}
void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
{
int i;
@ -349,6 +365,7 @@ void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
if (mdesc->reserve)
mdesc->reserve();
arm_memblock_steal_permitted = false;
memblock_allow_resize();
memblock_dump_all();
}

5
arch/arm/plat-omap/devices.c
View file

@ -20,6 +20,7 @@
#include <mach/hardware.h>
#include <asm/mach-types.h>
#include <asm/mach/map.h>
#include <asm/memblock.h>
#include <plat/tc.h>
#include <plat/board.h>
@ -164,14 +165,12 @@ void __init omap_dsp_reserve_sdram_memblock(void)
if (!size)
return;
paddr = memblock_alloc(size, SZ_1M);
paddr = arm_memblock_steal(size, SZ_1M);
if (!paddr) {
pr_err("%s: failed to reserve %x bytes\n",
__func__, size);
return;
}
memblock_free(paddr, size);
memblock_remove(paddr, size);
omap_dsp_phys_mempool_base = paddr;
}