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ARM: 8713/1: NOMMU: Support MPU in XIP configuration 

Currently, there is assumption in early MPU setup code that kernel
image is located in RAM, which is obviously not true for XIP. To run
code from ROM we need to make sure that it is covered by MPU. However,
due to we allocate regions (semi-)dynamically we can run into issue of
trimming region we are running from in case ROM spawns several MPU
regions. To help deal with that we enforce minimum alignments for start
end end of XIP address space as 1MB and 128Kb correspondingly.

Tested-by: Alexandre TORGUE <alexandre.torgue@st.com>
Tested-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Vladimir Murzin 2017-10-16 13:00:45 +01:00 committed by Russell King
parent 5c9d9a1b3a
commit 216218308c
5 changed files with 90 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/Kconfig-nommu
View File

@ -52,7 +52,7 @@ config REMAP_VECTORS_TO_RAM
config ARM_MPU
bool 'Use the ARM v7 PMSA Compliant MPU'
depends on !XIP_KERNEL && (CPU_V7 || CPU_V7M)
depends on CPU_V7 || CPU_V7M
default y if CPU_V7
help
Some ARM systems without an MMU have instead a Memory Protection

3
arch/arm/include/asm/mpu.h
View File

@ -41,6 +41,7 @@
#endif
/* Access permission bits of ACR (only define those that we use)*/
#define MPU_AP_PL1RO_PL0NA (0x5 << 8)
#define MPU_AP_PL1RW_PL0RW (0x3 << 8)
#define MPU_AP_PL1RW_PL0R0 (0x2 << 8)
#define MPU_AP_PL1RW_PL0NA (0x1 << 8)
@ -49,7 +50,7 @@
#define MPU_PROBE_REGION 0
#define MPU_BG_REGION 1
#define MPU_RAM_REGION 2
#define MPU_VECTORS_REGION 3
#define MPU_ROM_REGION 3
/* Maximum number of regions Linux is interested in */
#define MPU_MAX_REGIONS 16

20
arch/arm/kernel/head-nommu.S
View File

@ -258,6 +258,26 @@ M_CLASS(ldr r0, [r12, #MPU_TYPE])
setup_region r0, r5, r6, MPU_INSTR_SIDE r12 @ 0x0, BG region, enabled
2: isb
#ifdef CONFIG_XIP_KERNEL
set_region_nr r0, #MPU_ROM_REGION, r12
isb
ldr r5,=(MPU_AP_PL1RO_PL0NA | MPU_RGN_NORMAL)
ldr r0, =CONFIG_XIP_PHYS_ADDR @ ROM start
ldr r6, =(_exiprom) @ ROM end
sub r6, r6, r0 @ Minimum size of region to map
clz r6, r6 @ Region size must be 2^N...
rsb r6, r6, #31 @ ...so round up region size
lsl r6, r6, #MPU_RSR_SZ @ Put size in right field
orr r6, r6, #(1 << MPU_RSR_EN) @ Set region enabled bit
setup_region r0, r5, r6, MPU_DATA_SIDE, r12 @ XIP_PHYS_ADDR, shared, enabled
beq 3f @ Memory-map not unified
setup_region r0, r5, r6, MPU_INSTR_SIDE, r12 @ XIP_PHYS_ADDR, shared, enabled
3: isb
#endif
/* Enable the MPU */
AR_CLASS(mrc p15, 0, r0, c1, c0, 0) @ Read SCTLR
AR_CLASS(bic r0, r0, #CR_BR) @ Disable the 'default mem-map'

23
arch/arm/kernel/vmlinux-xip.lds.S
View File

@ -6,6 +6,8 @@
/* No __ro_after_init data in the .rodata section - which will always be ro */
#define RO_AFTER_INIT_DATA
#include <linux/sizes.h>
#include <asm-generic/vmlinux.lds.h>
#include <asm/cache.h>
#include <asm/thread_info.h>
@ -187,6 +189,9 @@ SECTIONS
INIT_RAM_FS
}
#ifdef CONFIG_ARM_MPU
. = ALIGN(SZ_128K);
#endif
_exiprom = .; /* End of XIP ROM area */
/*
@ -314,3 +319,21 @@ ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & PAGE_MASK) <= PAGE_SIZE,
*/
ASSERT((_end - __bss_start) >= 12288, ".bss too small for CONFIG_XIP_DEFLATED_DATA")
#endif
#ifdef CONFIG_ARM_MPU
/*
* Due to PMSAv7 restriction on base address and size we have to
* enforce minimal alignment restrictions. It was seen that weaker
* alignment restriction on _xiprom will likely force XIP address
* space spawns multiple MPU regions thus it is likely we run in
* situation when we are reprogramming MPU region we run on with
* something which doesn't cover reprogramming code itself, so as soon
* as we update MPU settings we'd immediately try to execute straight
* from background region which is XN.
* It seem that alignment in 1M should suit most users.
* _exiprom is aligned as 1/8 of 1M so can be covered by subregion
* disable
*/
ASSERT(!(_xiprom & (SZ_1M - 1)), "XIP start address may cause MPU programming issues")
ASSERT(!(_exiprom & (SZ_128K - 1)), "XIP end address may cause MPU programming issues")
#endif

49
arch/arm/mm/pmsa-v7.c
View File

@ -7,9 +7,11 @@
#include <linux/bitops.h>
#include <linux/memblock.h>
#include <asm/cacheflush.h>
#include <asm/cp15.h>
#include <asm/cputype.h>
#include <asm/mpu.h>
#include <asm/sections.h>
#include "mm.h"
@ -20,6 +22,9 @@ struct region {
};
static struct region __initdata mem[MPU_MAX_REGIONS];
#ifdef CONFIG_XIP_KERNEL
static struct region __initdata xip[MPU_MAX_REGIONS];
#endif
static unsigned int __initdata mpu_min_region_order;
static unsigned int __initdata mpu_max_regions;
@ -229,7 +234,6 @@ static int __init allocate_region(phys_addr_t base, phys_addr_t size,
/* MPU initialisation functions */
void __init adjust_lowmem_bounds_mpu(void)
{
phys_addr_t phys_offset = PHYS_OFFSET;
phys_addr_t specified_mem_size, total_mem_size = 0;
struct memblock_region *reg;
bool first = true;
@ -256,8 +260,19 @@ void __init adjust_lowmem_bounds_mpu(void)
/* ... and one for vectors */
mem_max_regions--;
#endif
#ifdef CONFIG_XIP_KERNEL
/* plus some regions to cover XIP ROM */
num = allocate_region(CONFIG_XIP_PHYS_ADDR, __pa(_exiprom) - CONFIG_XIP_PHYS_ADDR,
mem_max_regions, xip);
mem_max_regions -= num;
#endif
for_each_memblock(memory, reg) {
if (first) {
phys_addr_t phys_offset = PHYS_OFFSET;
/*
* Initially only use memory continuous from
* PHYS_OFFSET */
@ -355,7 +370,7 @@ static int __init __mpu_min_region_order(void)
static int __init mpu_setup_region(unsigned int number, phys_addr_t start,
unsigned int size_order, unsigned int properties,
unsigned int subregions)
unsigned int subregions, bool need_flush)
{
u32 size_data;
@ -374,6 +389,9 @@ static int __init mpu_setup_region(unsigned int number, phys_addr_t start,
size_data = ((size_order - 1) << MPU_RSR_SZ) | 1 << MPU_RSR_EN;
size_data |= subregions << MPU_RSR_SD;
if (need_flush)
flush_cache_all();
dsb(); /* Ensure all previous data accesses occur with old mappings */
rgnr_write(number);
isb();
@ -416,7 +434,28 @@ void __init mpu_setup(void)
/* Background */
err |= mpu_setup_region(region++, 0, 32,
MPU_ACR_XN | MPU_RGN_STRONGLY_ORDERED | MPU_AP_PL1RW_PL0NA,
0);
0, false);
#ifdef CONFIG_XIP_KERNEL
/* ROM */
for (i = 0; i < ARRAY_SIZE(xip); i++) {
/*
* In case we overwrite RAM region we set earlier in
* head-nommu.S (which is cachable) all subsequent
* data access till we setup RAM bellow would be done
* with BG region (which is uncachable), thus we need
* to clean and invalidate cache.
*/
bool need_flush = region == MPU_RAM_REGION;
if (!xip[i].size)
continue;
err |= mpu_setup_region(region++, xip[i].base, ilog2(xip[i].size),
MPU_AP_PL1RO_PL0NA | MPU_RGN_NORMAL,
xip[i].subreg, need_flush);
}
#endif
/* RAM */
for (i = 0; i < ARRAY_SIZE(mem); i++) {
@ -425,14 +464,14 @@ void __init mpu_setup(void)
err |= mpu_setup_region(region++, mem[i].base, ilog2(mem[i].size),
MPU_AP_PL1RW_PL0RW | MPU_RGN_NORMAL,
mem[i].subreg);
mem[i].subreg, false);
}
/* Vectors */
#ifndef CONFIG_CPU_V7M
err |= mpu_setup_region(region++, vectors_base, ilog2(2 * PAGE_SIZE),
MPU_AP_PL1RW_PL0NA | MPU_RGN_NORMAL,
0);
0, false);
#endif
if (err) {
panic("MPU region initialization failure! %d", err);