356 lines
9.3 KiB
C
356 lines
9.3 KiB
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)
|
|
{
|
|
}
|
|
|
|
static inline void cacheop_on_each_cpu(void (*func) (void *info), void *info,
|
|
int wait)
|
|
{
|
|
preempt_disable();
|
|
|
|
/*
|
|
* 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);
|
|
|
|
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_mapped(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_mapped(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_mapped(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_mapped(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)
|
|
{
|
|
c->alias_mask = ((c->sets - 1) << c->entry_shift) & ~(PAGE_SIZE - 1);
|
|
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.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();
|
|
}
|