File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/arch/sh/mm/cache.c b/arch/sh/mm/cache.c
new file mode 100644
index 0000000..f770e39
--- /dev/null
+++ b/arch/sh/mm/cache.c
@@ -0,0 +1,356 @@
+/*
+ * 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();
+}