Release 4.14 arch/sh/mm/cache.c

/*
 * arch/sh/mm/cache.c
 *
 * Copyright (C) 1999, 2000, 2002  Niibe Yutaka
 * Copyright (C) 2002 - 2010  Paul Mundt
 *
 * Released under the terms of the GNU GPL v2.0.
 */
#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)
{
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Paul Mundt
13
100.00%
1
100.00%
Total
13
100.00%
1
100.00%



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();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Paul Mundt
53
89.83%
2
66.67%
Rich Felker
6
10.17%
1
33.33%
Total
59
100.00%
3
100.00%



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));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Paul Mundt
138
99.28%
7
87.50%
Kirill A. Shutemov
1
0.72%
1
12.50%
Total
139
100.00%
8
100.00%



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);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Paul Mundt
118
99.16%
8
88.89%
Kirill A. Shutemov
1
0.84%
1
11.11%
Total
119
100.00%
9
100.00%



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();
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Paul Mundt
136
93.79%
6
75.00%
Stuart Menefy
8
5.52%
1
12.50%
Kirill A. Shutemov
1
0.69%
1
12.50%
Total
145
100.00%
8
100.00%


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);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Paul Mundt
55
100.00%
2
100.00%
Total
55
100.00%
2
100.00%


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);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Paul Mundt
83
97.65%
2
66.67%
Markus Pietrek
2
2.35%
1
33.33%
Total
85
100.00%
3
100.00%



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);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Paul Mundt
94
98.95%
4
80.00%
Kirill A. Shutemov
1
1.05%
1
20.00%
Total
95
100.00%
5
100.00%



void flush_cache_all(void)
{
	cacheop_on_each_cpu(local_flush_cache_all, NULL, 1);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Paul Mundt
16
100.00%
2
100.00%
Total
16
100.00%
2
100.00%


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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Paul Mundt
30
100.00%
3
100.00%
Total
30
100.00%
3
100.00%



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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Paul Mundt
30
100.00%
3
100.00%
Total
30
100.00%
3
100.00%



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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Paul Mundt
54
100.00%
2
100.00%
Total
54
100.00%
2
100.00%



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);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Paul Mundt
54
100.00%
2
100.00%
Total
54
100.00%
2
100.00%


EXPORT_SYMBOL(flush_cache_range);



void flush_dcache_page(struct page *page)
{
	cacheop_on_each_cpu(local_flush_dcache_page, page, 1);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Paul Mundt
19
100.00%
2
100.00%
Total
19
100.00%
2
100.00%


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);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Paul Mundt
49
100.00%
2
100.00%
Total
49
100.00%
2
100.00%


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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Paul Mundt
25
100.00%
2
100.00%
Total
25
100.00%
2
100.00%



void flush_cache_sigtramp(unsigned long address)
{
	cacheop_on_each_cpu(local_flush_cache_sigtramp, (void *)address, 1);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Paul Mundt
22
100.00%
2
100.00%
Total
22
100.00%
2
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Paul Mundt
56
81.16%
1
50.00%
Rich Felker
13
18.84%
1
50.00%
Total
69
100.00%
2
100.00%



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);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Paul Mundt
164
100.00%
1
100.00%
Total
164
100.00%
1
100.00%



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();
		}
	}

	if (boot_cpu_data.family == CPU_FAMILY_SH5) {
		extern void __weak sh5_cache_init(void);

		sh5_cache_init();
	}

skip:
	emit_cache_params();
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Paul Mundt
243
83.22%
10
76.92%
Magnus Damm
25
8.56%
1
7.69%
Rich Felker
22
7.53%
1
7.69%
Geert Uytterhoeven
2
0.68%
1
7.69%
Total
292
100.00%
13
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Paul Mundt
1679
95.07%
32
78.05%
Rich Felker
41
2.32%
3
7.32%
Magnus Damm
25
1.42%
1
2.44%
Stuart Menefy
8
0.45%
1
2.44%
Pranith Kumar
5
0.28%
1
2.44%
Kirill A. Shutemov
4
0.23%
1
2.44%
Markus Pietrek
2
0.11%
1
2.44%
Geert Uytterhoeven
2
0.11%
1
2.44%
Total
1766
100.00%
41
100.00%
Directory: arch/sh/mm

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.