kernel.git/arch/arm64/include/asm/pgtable.h, branch linux-3.17.y

arm64: Fix barriers used for page table modifications

2014-07-24T09:25:42Z

The architecture specification states that both DSB and ISB are required between page table modifications and subsequent memory accesses using the corresponding virtual address. When TLB invalidation takes place, the tlb_flush_* functions already have the necessary barriers. However, there are other functions like create_mapping() for which this is not the case. The patch adds the DSB+ISB instructions in the set_pte() function for valid kernel mappings. The invalid pte case is handled by tlb_flush_* and the user mappings in general have a corresponding update_mmu_cache() call containing a DSB. Even when update_mmu_cache() isn't called, the kernel can still cope with an unlikely spurious page fault by re-executing the instruction. In addition, the set_pmd, set_pud() functions gain an ISB for architecture compliance when block mappings are created. Signed-off-by: Catalin Marinas Reported-by: Leif Lindholm Acked-by: Steve Capper Cc: Will Deacon Cc:

arm64: asm/pgtable.h pmd/pud definitions clean-up

2014-07-23T14:28:10Z

Non-functional change to group together the pmd/pud definitions and reduce the amount of #if CONFIG_ARM64_PGTABLE_LEVELS. Signed-off-by: Catalin Marinas Tested-by: Jungseok Lee

arm64: Determine the vmalloc/vmemmap space at build time based on VA_BITS

2014-07-23T14:28:05Z

Rather than guessing what the maximum vmmemap space should be, this patch allows the calculation based on the VA_BITS and sizeof(struct page). The vmalloc space extends to the beginning of the vmemmap space. Since the virtual kernel memory layout now depends on the build configuration, this patch removes the detailed description in Documentation/arm64/memory.txt in favour of information printed during kernel booting. Signed-off-by: Catalin Marinas Tested-by: Jungseok Lee

arm64: Convert bool ARM64_x_LEVELS to int ARM64_PGTABLE_LEVELS

2014-07-23T14:27:46Z

Rather than having several Kconfig options, define int ARM64_PGTABLE_LEVELS which will be also useful in converting some of the pgtable macros. Signed-off-by: Catalin Marinas Tested-by: Jungseok Lee

arm64: mm: Implement 4 levels of translation tables

2014-07-23T14:27:40Z

This patch implements 4 levels of translation tables since 3 levels of page tables with 4KB pages cannot support 40-bit physical address space described in [1] due to the following issue. It is a restriction that kernel logical memory map with 4KB + 3 levels (0xffffffc000000000-0xffffffffffffffff) cannot cover RAM region from 544GB to 1024GB in [1]. Specifically, ARM64 kernel fails to create mapping for this region in map_mem function since __phys_to_virt for this region reaches to address overflow. If SoC design follows the document, [1], over 32GB RAM would be placed from 544GB. Even 64GB system is supposed to use the region from 544GB to 576GB for only 32GB RAM. Naturally, it would reach to enable 4 levels of page tables to avoid hacking __virt_to_phys and __phys_to_virt. However, it is recommended 4 levels of page table should be only enabled if memory map is too sparse or there is about 512GB RAM. References ---------- [1]: Principles of ARM Memory Maps, White Paper, Issue C Signed-off-by: Jungseok Lee Reviewed-by: Sungjinn Chung Acked-by: Kukjin Kim Reviewed-by: Christoffer Dall Reviewed-by: Steve Capper [catalin.marinas@arm.com: MEMBLOCK_INITIAL_LIMIT removed, same as PUD_SIZE] [catalin.marinas@arm.com: early_ioremap_init() updated for 4 levels] [catalin.marinas@arm.com: 48-bit VA depends on BROKEN until KVM is fixed] Signed-off-by: Catalin Marinas Tested-by: Jungseok Lee

arm64: Introduce VA_BITS and translation level options

2014-07-23T14:27:21Z

This patch adds virtual address space size and a level of translation tables to kernel configuration. It facilicates introduction of different MMU options, such as 4KB + 4 levels, 16KB + 4 levels and 64KB + 3 levels, easily. The idea is based on the discussion with Catalin Marinas: http://www.spinics.net/linux/lists/arm-kernel/msg319552.html Signed-off-by: Jungseok Lee Reviewed-by: Sungjinn Chung Acked-by: Kukjin Kim Reviewed-by: Christoffer Dall Signed-off-by: Catalin Marinas Tested-by: Jungseok Lee

arm64: Remove duplicate (SWAPPER|IDMAP)_DIR_SIZE definitions

2014-07-17T15:02:42Z

Just keep the asm/page.h definition as this is included in vmlinux.lds.S as well. Signed-off-by: Catalin Marinas Acked-by: Mark Rutland

arm64: mm: Fix horrendous config typo

2014-07-04T13:22:30Z

The define ARM64_64K_PAGES is tested for rather than CONFIG_ARM64_64K_PAGES. Correct that typo here. Signed-off-by: Steve Capper Signed-off-by: Catalin Marinas

arm64: mm: remove broken &= operator from pmd_mknotpresent

2014-06-18T15:34:30Z

This should be a plain old '&' and could easily lead to undefined behaviour if the target of a pmd_mknotpresent invocation was the same as the parameter. Fixes: 9c7e535fcc17 (arm64: mm: Route pmd thp functions through pte equivalents) Signed-off-by: Will Deacon Cc: # v3.15 Signed-off-by: Catalin Marinas

Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux into next

2014-06-06T17:43:28Z

Pull arm64 updates from Catalin Marinas: - Optimised assembly string/memory routines (based on the AArch64 Cortex Strings library contributed to glibc but re-licensed under GPLv2) - Optimised crypto algorithms making use of the ARMv8 crypto extensions (together with kernel API for using FPSIMD instructions in interrupt context) - Ftrace support - CPU topology parsing from DT - ESR_EL1 (Exception Syndrome Register) exposed to user space signal handlers for SIGSEGV/SIGBUS (useful to emulation tools like Qemu) - 1GB section linear mapping if applicable - Barriers usage clean-up - Default pgprot clean-up Conflicts as per Catalin. * tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (57 commits) arm64: kernel: initialize broadcast hrtimer based clock event device arm64: ftrace: Add system call tracepoint arm64: ftrace: Add CALLER_ADDRx macros arm64: ftrace: Add dynamic ftrace support arm64: Add ftrace support ftrace: Add arm64 support to recordmcount arm64: Add 'notrace' attribute to unwind_frame() for ftrace arm64: add __ASSEMBLY__ in asm/insn.h arm64: Fix linker script entry point arm64: lib: Implement optimized string length routines arm64: lib: Implement optimized string compare routines arm64: lib: Implement optimized memcmp routine arm64: lib: Implement optimized memset routine arm64: lib: Implement optimized memmove routine arm64: lib: Implement optimized memcpy routine arm64: defconfig: enable a few more common/useful options in defconfig ftrace: Make CALLER_ADDRx macros more generic arm64: Fix deadlock scenario with smp_send_stop() arm64: Fix machine_shutdown() definition arm64: Support arch_irq_work_raise() via self IPIs ...