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| author | Alexandre Ghiti <alexandre.ghiti@canonical.com> | 2021-12-06 11:46:48 +0100 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2022-01-19 17:54:07 -0800 |
| commit | 3270bfdb9e4a01bb15d018612a6354c1837b5f97 (patch) | |
| tree | 6d948ca0ba57cd53294fa72d36e859a77cc73db0 /arch/riscv | |
| parent | 840125a97abc7e676d839adc2743e8f703a156b3 (diff) | |
| download | linux-3270bfdb9e4a01bb15d018612a6354c1837b5f97.tar.bz2 | |
riscv: Allow to dynamically define VA_BITS
With 4-level page table folding at runtime, we don't know at compile time
the size of the virtual address space so we must set VA_BITS dynamically
so that sparsemem reserves the right amount of memory for struct pages.
Signed-off-by: Alexandre Ghiti <alexandre.ghiti@canonical.com>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch/riscv')
| -rw-r--r-- | arch/riscv/Kconfig | 10 | ||||
| -rw-r--r-- | arch/riscv/include/asm/kasan.h | 2 | ||||
| -rw-r--r-- | arch/riscv/include/asm/pgtable.h | 10 | ||||
| -rw-r--r-- | arch/riscv/include/asm/sparsemem.h | 6 |
4 files changed, 14 insertions, 14 deletions
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 7f8aea333291..7945bacb1d0e 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -146,16 +146,6 @@ config MMU Select if you want MMU-based virtualised addressing space support by paged memory management. If unsure, say 'Y'. -config VA_BITS - int - default 32 if 32BIT - default 39 if 64BIT - -config PA_BITS - int - default 34 if 32BIT - default 56 if 64BIT - config PAGE_OFFSET hex default 0xC0000000 if 32BIT diff --git a/arch/riscv/include/asm/kasan.h b/arch/riscv/include/asm/kasan.h index 2788e2c46609..743e6ff57996 100644 --- a/arch/riscv/include/asm/kasan.h +++ b/arch/riscv/include/asm/kasan.h @@ -27,7 +27,7 @@ */ #define KASAN_SHADOW_SCALE_SHIFT 3 -#define KASAN_SHADOW_SIZE (UL(1) << ((CONFIG_VA_BITS - 1) - KASAN_SHADOW_SCALE_SHIFT)) +#define KASAN_SHADOW_SIZE (UL(1) << ((VA_BITS - 1) - KASAN_SHADOW_SCALE_SHIFT)) #define KASAN_SHADOW_START (KASAN_SHADOW_END - KASAN_SHADOW_SIZE) #define KASAN_SHADOW_END MODULES_LOWEST_VADDR #define KASAN_SHADOW_OFFSET _AC(CONFIG_KASAN_SHADOW_OFFSET, UL) diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index fa400b2abb36..23c7c66f2d79 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -61,8 +61,14 @@ * struct pages to map half the virtual address space. Then * position vmemmap directly below the VMALLOC region. */ +#ifdef CONFIG_64BIT +#define VA_BITS 39 +#else +#define VA_BITS 32 +#endif + #define VMEMMAP_SHIFT \ - (CONFIG_VA_BITS - PAGE_SHIFT - 1 + STRUCT_PAGE_MAX_SHIFT) + (VA_BITS - PAGE_SHIFT - 1 + STRUCT_PAGE_MAX_SHIFT) #define VMEMMAP_SIZE BIT(VMEMMAP_SHIFT) #define VMEMMAP_END (VMALLOC_START - 1) #define VMEMMAP_START (VMALLOC_START - VMEMMAP_SIZE) @@ -661,7 +667,7 @@ static inline pmd_t pmdp_establish(struct vm_area_struct *vma, * and give the kernel the other (upper) half. */ #ifdef CONFIG_64BIT -#define KERN_VIRT_START (-(BIT(CONFIG_VA_BITS)) + TASK_SIZE) +#define KERN_VIRT_START (-(BIT(VA_BITS)) + TASK_SIZE) #else #define KERN_VIRT_START FIXADDR_START #endif diff --git a/arch/riscv/include/asm/sparsemem.h b/arch/riscv/include/asm/sparsemem.h index 45a7018a8118..63acaecc3374 100644 --- a/arch/riscv/include/asm/sparsemem.h +++ b/arch/riscv/include/asm/sparsemem.h @@ -4,7 +4,11 @@ #define _ASM_RISCV_SPARSEMEM_H #ifdef CONFIG_SPARSEMEM -#define MAX_PHYSMEM_BITS CONFIG_PA_BITS +#ifdef CONFIG_64BIT +#define MAX_PHYSMEM_BITS 56 +#else +#define MAX_PHYSMEM_BITS 34 +#endif /* CONFIG_64BIT */ #define SECTION_SIZE_BITS 27 #endif /* CONFIG_SPARSEMEM */ |