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| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2016-02-16 13:52:35 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2016-02-18 18:16:16 +0000 |
| commit | 324420bf91f60582bb481133db9547111768ef17 (patch) | |
| tree | 4cfcb31a6d57dfb88ed953f78ac17ba08baf2af1 | |
| parent | 03336b1df9929e5d9c28fd9768948b6151cb046c (diff) | |
| download | lwn-324420bf91f60582bb481133db9547111768ef17.tar.gz lwn-324420bf91f60582bb481133db9547111768ef17.zip | |
arm64: add support for ioremap() block mappings
This wires up the existing generic huge-vmap feature, which allows
ioremap() to use PMD or PUD sized block mappings. It also adds support
to the unmap path for dealing with block mappings, which will allow us
to unmap the __init region using unmap_kernel_range() in a subsequent
patch.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
| -rw-r--r-- | Documentation/features/vm/huge-vmap/arch-support.txt | 2 | ||||
| -rw-r--r-- | arch/arm64/Kconfig | 1 | ||||
| -rw-r--r-- | arch/arm64/include/asm/memory.h | 6 | ||||
| -rw-r--r-- | arch/arm64/mm/mmu.c | 41 |
4 files changed, 49 insertions, 1 deletions
diff --git a/Documentation/features/vm/huge-vmap/arch-support.txt b/Documentation/features/vm/huge-vmap/arch-support.txt index af6816bccb43..df1d1f3c9af2 100644 --- a/Documentation/features/vm/huge-vmap/arch-support.txt +++ b/Documentation/features/vm/huge-vmap/arch-support.txt @@ -9,7 +9,7 @@ | alpha: | TODO | | arc: | TODO | | arm: | TODO | - | arm64: | TODO | + | arm64: | ok | | avr32: | TODO | | blackfin: | TODO | | c6x: | TODO | diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 3d9cab156740..cfa1cc90ebf4 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -50,6 +50,7 @@ config ARM64 select HAVE_ALIGNED_STRUCT_PAGE if SLUB select HAVE_ARCH_AUDITSYSCALL select HAVE_ARCH_BITREVERSE + select HAVE_ARCH_HUGE_VMAP select HAVE_ARCH_JUMP_LABEL select HAVE_ARCH_KASAN if SPARSEMEM_VMEMMAP && !(ARM64_16K_PAGES && ARM64_VA_BITS_48) select HAVE_ARCH_KGDB diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h index 853953cd1f08..c65aad7b13dc 100644 --- a/arch/arm64/include/asm/memory.h +++ b/arch/arm64/include/asm/memory.h @@ -100,6 +100,12 @@ #define MT_S2_NORMAL 0xf #define MT_S2_DEVICE_nGnRE 0x1 +#ifdef CONFIG_ARM64_4K_PAGES +#define IOREMAP_MAX_ORDER (PUD_SHIFT) +#else +#define IOREMAP_MAX_ORDER (PMD_SHIFT) +#endif + #ifndef __ASSEMBLY__ extern phys_addr_t memstart_addr; diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index a6f28e5b9585..3e0172e50644 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -747,3 +747,44 @@ void *__init fixmap_remap_fdt(phys_addr_t dt_phys) return dt_virt; } + +int __init arch_ioremap_pud_supported(void) +{ + /* only 4k granule supports level 1 block mappings */ + return IS_ENABLED(CONFIG_ARM64_4K_PAGES); +} + +int __init arch_ioremap_pmd_supported(void) +{ + return 1; +} + +int pud_set_huge(pud_t *pud, phys_addr_t phys, pgprot_t prot) +{ + BUG_ON(phys & ~PUD_MASK); + set_pud(pud, __pud(phys | PUD_TYPE_SECT | pgprot_val(mk_sect_prot(prot)))); + return 1; +} + +int pmd_set_huge(pmd_t *pmd, phys_addr_t phys, pgprot_t prot) +{ + BUG_ON(phys & ~PMD_MASK); + set_pmd(pmd, __pmd(phys | PMD_TYPE_SECT | pgprot_val(mk_sect_prot(prot)))); + return 1; +} + +int pud_clear_huge(pud_t *pud) +{ + if (!pud_sect(*pud)) + return 0; + pud_clear(pud); + return 1; +} + +int pmd_clear_huge(pmd_t *pmd) +{ + if (!pmd_sect(*pmd)) + return 0; + pmd_clear(pmd); + return 1; +} |