diff options
Diffstat (limited to '')
| -rw-r--r-- | arch/sh/mm/cache.c | 360 |
1 files changed, 360 insertions, 0 deletions
diff --git a/arch/sh/mm/cache.c b/arch/sh/mm/cache.c new file mode 100644 index 000000000..3aef78ceb --- /dev/null +++ b/arch/sh/mm/cache.c @@ -0,0 +1,360 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * arch/sh/mm/cache.c + * + * Copyright (C) 1999, 2000, 2002 Niibe Yutaka + * Copyright (C) 2002 - 2010 Paul Mundt + */ +#include <linux/mm.h> +#include <linux/init.h> +#include <linux/mutex.h> +#include <linux/fs.h> +#include <linux/smp.h> +#include <linux/highmem.h> +#include <linux/module.h> +#include <asm/mmu_context.h> +#include <asm/cacheflush.h> + +void (*local_flush_cache_all)(void *args) = cache_noop; +void (*local_flush_cache_mm)(void *args) = cache_noop; +void (*local_flush_cache_dup_mm)(void *args) = cache_noop; +void (*local_flush_cache_page)(void *args) = cache_noop; +void (*local_flush_cache_range)(void *args) = cache_noop; +void (*local_flush_dcache_page)(void *args) = cache_noop; +void (*local_flush_icache_range)(void *args) = cache_noop; +void (*local_flush_icache_page)(void *args) = cache_noop; +void (*local_flush_cache_sigtramp)(void *args) = cache_noop; + +void (*__flush_wback_region)(void *start, int size); +EXPORT_SYMBOL(__flush_wback_region); +void (*__flush_purge_region)(void *start, int size); +EXPORT_SYMBOL(__flush_purge_region); +void (*__flush_invalidate_region)(void *start, int size); +EXPORT_SYMBOL(__flush_invalidate_region); + +static inline void noop__flush_region(void *start, int size) +{ +} + +static inline void cacheop_on_each_cpu(void (*func) (void *info), void *info, + int wait) +{ + preempt_disable(); + + /* Needing IPI for cross-core flush is SHX3-specific. */ +#ifdef CONFIG_CPU_SHX3 + /* + * It's possible that this gets called early on when IRQs are + * still disabled due to ioremapping by the boot CPU, so don't + * even attempt IPIs unless there are other CPUs online. + */ + if (num_online_cpus() > 1) + smp_call_function(func, info, wait); +#endif + + func(info); + + preempt_enable(); +} + +void copy_to_user_page(struct vm_area_struct *vma, struct page *page, + unsigned long vaddr, void *dst, const void *src, + unsigned long len) +{ + if (boot_cpu_data.dcache.n_aliases && page_mapcount(page) && + test_bit(PG_dcache_clean, &page->flags)) { + void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK); + memcpy(vto, src, len); + kunmap_coherent(vto); + } else { + memcpy(dst, src, len); + if (boot_cpu_data.dcache.n_aliases) + clear_bit(PG_dcache_clean, &page->flags); + } + + if (vma->vm_flags & VM_EXEC) + flush_cache_page(vma, vaddr, page_to_pfn(page)); +} + +void copy_from_user_page(struct vm_area_struct *vma, struct page *page, + unsigned long vaddr, void *dst, const void *src, + unsigned long len) +{ + if (boot_cpu_data.dcache.n_aliases && page_mapcount(page) && + test_bit(PG_dcache_clean, &page->flags)) { + void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK); + memcpy(dst, vfrom, len); + kunmap_coherent(vfrom); + } else { + memcpy(dst, src, len); + if (boot_cpu_data.dcache.n_aliases) + clear_bit(PG_dcache_clean, &page->flags); + } +} + +void copy_user_highpage(struct page *to, struct page *from, + unsigned long vaddr, struct vm_area_struct *vma) +{ + void *vfrom, *vto; + + vto = kmap_atomic(to); + + if (boot_cpu_data.dcache.n_aliases && page_mapcount(from) && + test_bit(PG_dcache_clean, &from->flags)) { + vfrom = kmap_coherent(from, vaddr); + copy_page(vto, vfrom); + kunmap_coherent(vfrom); + } else { + vfrom = kmap_atomic(from); + copy_page(vto, vfrom); + kunmap_atomic(vfrom); + } + + if (pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK) || + (vma->vm_flags & VM_EXEC)) + __flush_purge_region(vto, PAGE_SIZE); + + kunmap_atomic(vto); + /* Make sure this page is cleared on other CPU's too before using it */ + smp_wmb(); +} +EXPORT_SYMBOL(copy_user_highpage); + +void clear_user_highpage(struct page *page, unsigned long vaddr) +{ + void *kaddr = kmap_atomic(page); + + clear_page(kaddr); + + if (pages_do_alias((unsigned long)kaddr, vaddr & PAGE_MASK)) + __flush_purge_region(kaddr, PAGE_SIZE); + + kunmap_atomic(kaddr); +} +EXPORT_SYMBOL(clear_user_highpage); + +void __update_cache(struct vm_area_struct *vma, + unsigned long address, pte_t pte) +{ + struct page *page; + unsigned long pfn = pte_pfn(pte); + + if (!boot_cpu_data.dcache.n_aliases) + return; + + page = pfn_to_page(pfn); + if (pfn_valid(pfn)) { + int dirty = !test_and_set_bit(PG_dcache_clean, &page->flags); + if (dirty) + __flush_purge_region(page_address(page), PAGE_SIZE); + } +} + +void __flush_anon_page(struct page *page, unsigned long vmaddr) +{ + unsigned long addr = (unsigned long) page_address(page); + + if (pages_do_alias(addr, vmaddr)) { + if (boot_cpu_data.dcache.n_aliases && page_mapcount(page) && + test_bit(PG_dcache_clean, &page->flags)) { + void *kaddr; + + kaddr = kmap_coherent(page, vmaddr); + /* XXX.. For now kunmap_coherent() does a purge */ + /* __flush_purge_region((void *)kaddr, PAGE_SIZE); */ + kunmap_coherent(kaddr); + } else + __flush_purge_region((void *)addr, PAGE_SIZE); + } +} + +void flush_cache_all(void) +{ + cacheop_on_each_cpu(local_flush_cache_all, NULL, 1); +} +EXPORT_SYMBOL(flush_cache_all); + +void flush_cache_mm(struct mm_struct *mm) +{ + if (boot_cpu_data.dcache.n_aliases == 0) + return; + + cacheop_on_each_cpu(local_flush_cache_mm, mm, 1); +} + +void flush_cache_dup_mm(struct mm_struct *mm) +{ + if (boot_cpu_data.dcache.n_aliases == 0) + return; + + cacheop_on_each_cpu(local_flush_cache_dup_mm, mm, 1); +} + +void flush_cache_page(struct vm_area_struct *vma, unsigned long addr, + unsigned long pfn) +{ + struct flusher_data data; + + data.vma = vma; + data.addr1 = addr; + data.addr2 = pfn; + + cacheop_on_each_cpu(local_flush_cache_page, (void *)&data, 1); +} + +void flush_cache_range(struct vm_area_struct *vma, unsigned long start, + unsigned long end) +{ + struct flusher_data data; + + data.vma = vma; + data.addr1 = start; + data.addr2 = end; + + cacheop_on_each_cpu(local_flush_cache_range, (void *)&data, 1); +} +EXPORT_SYMBOL(flush_cache_range); + +void flush_dcache_page(struct page *page) +{ + cacheop_on_each_cpu(local_flush_dcache_page, page, 1); +} +EXPORT_SYMBOL(flush_dcache_page); + +void flush_icache_range(unsigned long start, unsigned long end) +{ + struct flusher_data data; + + data.vma = NULL; + data.addr1 = start; + data.addr2 = end; + + cacheop_on_each_cpu(local_flush_icache_range, (void *)&data, 1); +} +EXPORT_SYMBOL(flush_icache_range); + +void flush_icache_page(struct vm_area_struct *vma, struct page *page) +{ + /* Nothing uses the VMA, so just pass the struct page along */ + cacheop_on_each_cpu(local_flush_icache_page, page, 1); +} + +void flush_cache_sigtramp(unsigned long address) +{ + cacheop_on_each_cpu(local_flush_cache_sigtramp, (void *)address, 1); +} + +static void compute_alias(struct cache_info *c) +{ +#ifdef CONFIG_MMU + c->alias_mask = ((c->sets - 1) << c->entry_shift) & ~(PAGE_SIZE - 1); +#else + c->alias_mask = 0; +#endif + c->n_aliases = c->alias_mask ? (c->alias_mask >> PAGE_SHIFT) + 1 : 0; +} + +static void __init emit_cache_params(void) +{ + printk(KERN_NOTICE "I-cache : n_ways=%d n_sets=%d way_incr=%d\n", + boot_cpu_data.icache.ways, + boot_cpu_data.icache.sets, + boot_cpu_data.icache.way_incr); + printk(KERN_NOTICE "I-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n", + boot_cpu_data.icache.entry_mask, + boot_cpu_data.icache.alias_mask, + boot_cpu_data.icache.n_aliases); + printk(KERN_NOTICE "D-cache : n_ways=%d n_sets=%d way_incr=%d\n", + boot_cpu_data.dcache.ways, + boot_cpu_data.dcache.sets, + boot_cpu_data.dcache.way_incr); + printk(KERN_NOTICE "D-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n", + boot_cpu_data.dcache.entry_mask, + boot_cpu_data.dcache.alias_mask, + boot_cpu_data.dcache.n_aliases); + + /* + * Emit Secondary Cache parameters if the CPU has a probed L2. + */ + if (boot_cpu_data.flags & CPU_HAS_L2_CACHE) { + printk(KERN_NOTICE "S-cache : n_ways=%d n_sets=%d way_incr=%d\n", + boot_cpu_data.scache.ways, + boot_cpu_data.scache.sets, + boot_cpu_data.scache.way_incr); + printk(KERN_NOTICE "S-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n", + boot_cpu_data.scache.entry_mask, + boot_cpu_data.scache.alias_mask, + boot_cpu_data.scache.n_aliases); + } +} + +void __init cpu_cache_init(void) +{ + unsigned int cache_disabled = 0; + +#ifdef SH_CCR + cache_disabled = !(__raw_readl(SH_CCR) & CCR_CACHE_ENABLE); +#endif + + compute_alias(&boot_cpu_data.icache); + compute_alias(&boot_cpu_data.dcache); + compute_alias(&boot_cpu_data.scache); + + __flush_wback_region = noop__flush_region; + __flush_purge_region = noop__flush_region; + __flush_invalidate_region = noop__flush_region; + + /* + * No flushing is necessary in the disabled cache case so we can + * just keep the noop functions in local_flush_..() and __flush_..() + */ + if (unlikely(cache_disabled)) + goto skip; + + if (boot_cpu_data.type == CPU_J2) { + extern void __weak j2_cache_init(void); + + j2_cache_init(); + } else if (boot_cpu_data.family == CPU_FAMILY_SH2) { + extern void __weak sh2_cache_init(void); + + sh2_cache_init(); + } + + if (boot_cpu_data.family == CPU_FAMILY_SH2A) { + extern void __weak sh2a_cache_init(void); + + sh2a_cache_init(); + } + + if (boot_cpu_data.family == CPU_FAMILY_SH3) { + extern void __weak sh3_cache_init(void); + + sh3_cache_init(); + + if ((boot_cpu_data.type == CPU_SH7705) && + (boot_cpu_data.dcache.sets == 512)) { + extern void __weak sh7705_cache_init(void); + + sh7705_cache_init(); + } + } + + if ((boot_cpu_data.family == CPU_FAMILY_SH4) || + (boot_cpu_data.family == CPU_FAMILY_SH4A) || + (boot_cpu_data.family == CPU_FAMILY_SH4AL_DSP)) { + extern void __weak sh4_cache_init(void); + + sh4_cache_init(); + + if ((boot_cpu_data.type == CPU_SH7786) || + (boot_cpu_data.type == CPU_SHX3)) { + extern void __weak shx3_cache_init(void); + + shx3_cache_init(); + } + } + +skip: + emit_cache_params(); +} |