diff options
| -rw-r--r-- | arch/powerpc/include/asm/nohash/32/slice.h | 18 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/slice.h | 4 | ||||
| -rw-r--r-- | arch/powerpc/mm/slice.c | 37 |
3 files changed, 50 insertions, 9 deletions
diff --git a/arch/powerpc/include/asm/nohash/32/slice.h b/arch/powerpc/include/asm/nohash/32/slice.h new file mode 100644 index 0000000..95d532e --- /dev/null +++ b/arch/powerpc/include/asm/nohash/32/slice.h @@ -0,0 +1,18 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_POWERPC_NOHASH_32_SLICE_H +#define _ASM_POWERPC_NOHASH_32_SLICE_H + +#ifdef CONFIG_PPC_MM_SLICES + +#define SLICE_LOW_SHIFT 28 +#define SLICE_LOW_TOP (0x100000000ull) +#define SLICE_NUM_LOW (SLICE_LOW_TOP >> SLICE_LOW_SHIFT) +#define GET_LOW_SLICE_INDEX(addr) ((addr) >> SLICE_LOW_SHIFT) + +#define SLICE_HIGH_SHIFT 0 +#define SLICE_NUM_HIGH 0ul +#define GET_HIGH_SLICE_INDEX(addr) (addr & 0) + +#endif /* CONFIG_PPC_MM_SLICES */ + +#endif /* _ASM_POWERPC_NOHASH_32_SLICE_H */ diff --git a/arch/powerpc/include/asm/slice.h b/arch/powerpc/include/asm/slice.h index 17c5a5d..172711f 100644 --- a/arch/powerpc/include/asm/slice.h +++ b/arch/powerpc/include/asm/slice.h @@ -4,8 +4,10 @@ #ifdef CONFIG_PPC_BOOK3S_64 #include <asm/book3s/64/slice.h> -#else +#elif defined(CONFIG_PPC64) #include <asm/nohash/64/slice.h> +#elif defined(CONFIG_PPC_MMU_NOHASH) +#include <asm/nohash/32/slice.h> #endif #ifdef CONFIG_PPC_MM_SLICES diff --git a/arch/powerpc/mm/slice.c b/arch/powerpc/mm/slice.c index 98b53d4..0beca1b 100644 --- a/arch/powerpc/mm/slice.c +++ b/arch/powerpc/mm/slice.c @@ -73,10 +73,12 @@ static void slice_range_to_mask(unsigned long start, unsigned long len, unsigned long end = start + len - 1; ret->low_slices = 0; - bitmap_zero(ret->high_slices, SLICE_NUM_HIGH); + if (SLICE_NUM_HIGH) + bitmap_zero(ret->high_slices, SLICE_NUM_HIGH); if (start < SLICE_LOW_TOP) { - unsigned long mend = min(end, (SLICE_LOW_TOP - 1)); + unsigned long mend = min(end, + (unsigned long)(SLICE_LOW_TOP - 1)); ret->low_slices = (1u << (GET_LOW_SLICE_INDEX(mend) + 1)) - (1u << GET_LOW_SLICE_INDEX(start)); @@ -113,11 +115,13 @@ static int slice_high_has_vma(struct mm_struct *mm, unsigned long slice) unsigned long start = slice << SLICE_HIGH_SHIFT; unsigned long end = start + (1ul << SLICE_HIGH_SHIFT); +#ifdef CONFIG_PPC64 /* Hack, so that each addresses is controlled by exactly one * of the high or low area bitmaps, the first high area starts * at 4GB, not 0 */ if (start == 0) start = SLICE_LOW_TOP; +#endif return !slice_area_is_free(mm, start, end - start); } @@ -128,7 +132,8 @@ static void slice_mask_for_free(struct mm_struct *mm, struct slice_mask *ret, unsigned long i; ret->low_slices = 0; - bitmap_zero(ret->high_slices, SLICE_NUM_HIGH); + if (SLICE_NUM_HIGH) + bitmap_zero(ret->high_slices, SLICE_NUM_HIGH); for (i = 0; i < SLICE_NUM_LOW; i++) if (!slice_low_has_vma(mm, i)) @@ -151,7 +156,8 @@ static void slice_mask_for_size(struct mm_struct *mm, int psize, struct slice_ma u64 lpsizes; ret->low_slices = 0; - bitmap_zero(ret->high_slices, SLICE_NUM_HIGH); + if (SLICE_NUM_HIGH) + bitmap_zero(ret->high_slices, SLICE_NUM_HIGH); lpsizes = mm->context.low_slices_psize; for (i = 0; i < SLICE_NUM_LOW; i++) @@ -180,6 +186,10 @@ static int slice_check_fit(struct mm_struct *mm, */ unsigned long slice_count = GET_HIGH_SLICE_INDEX(mm->context.slb_addr_limit); + if (!SLICE_NUM_HIGH) + return (mask.low_slices & available.low_slices) == + mask.low_slices; + bitmap_and(result, mask.high_slices, available.high_slices, slice_count); @@ -189,6 +199,7 @@ static int slice_check_fit(struct mm_struct *mm, static void slice_flush_segments(void *parm) { +#ifdef CONFIG_PPC64 struct mm_struct *mm = parm; unsigned long flags; @@ -200,6 +211,7 @@ static void slice_flush_segments(void *parm) local_irq_save(flags); slb_flush_and_rebolt(); local_irq_restore(flags); +#endif } static void slice_convert(struct mm_struct *mm, struct slice_mask mask, int psize) @@ -389,6 +401,8 @@ static unsigned long slice_find_area(struct mm_struct *mm, unsigned long len, static inline void slice_or_mask(struct slice_mask *dst, struct slice_mask *src) { dst->low_slices |= src->low_slices; + if (!SLICE_NUM_HIGH) + return; bitmap_or(dst->high_slices, dst->high_slices, src->high_slices, SLICE_NUM_HIGH); } @@ -397,6 +411,8 @@ static inline void slice_andnot_mask(struct slice_mask *dst, struct slice_mask * { dst->low_slices &= ~src->low_slices; + if (!SLICE_NUM_HIGH) + return; bitmap_andnot(dst->high_slices, dst->high_slices, src->high_slices, SLICE_NUM_HIGH); } @@ -446,14 +462,17 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len, * init different masks */ mask.low_slices = 0; - bitmap_zero(mask.high_slices, SLICE_NUM_HIGH); /* silence stupid warning */; potential_mask.low_slices = 0; - bitmap_zero(potential_mask.high_slices, SLICE_NUM_HIGH); compat_mask.low_slices = 0; - bitmap_zero(compat_mask.high_slices, SLICE_NUM_HIGH); + + if (SLICE_NUM_HIGH) { + bitmap_zero(mask.high_slices, SLICE_NUM_HIGH); + bitmap_zero(potential_mask.high_slices, SLICE_NUM_HIGH); + bitmap_zero(compat_mask.high_slices, SLICE_NUM_HIGH); + } /* Sanity checks */ BUG_ON(mm->task_size == 0); @@ -591,7 +610,9 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len, convert: slice_andnot_mask(&mask, &good_mask); slice_andnot_mask(&mask, &compat_mask); - if (mask.low_slices || !bitmap_empty(mask.high_slices, SLICE_NUM_HIGH)) { + if (mask.low_slices || + (SLICE_NUM_HIGH && + !bitmap_empty(mask.high_slices, SLICE_NUM_HIGH))) { slice_convert(mm, mask, psize); if (psize > MMU_PAGE_BASE) on_each_cpu(slice_flush_segments, mm, 1); |
