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/* arch/sparc64/mm/tlb.c
*
* Copyright (C) 2004 David S. Miller <davem@redhat.com>
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/percpu.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/preempt.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>
#include <asm/cacheflush.h>
#include <asm/mmu_context.h>
#include <asm/tlb.h>
/* Heavily inspired by the ppc64 code. */
static DEFINE_PER_CPU(struct tlb_batch, tlb_batch);
void flush_tlb_pending(void)
{
struct tlb_batch *tb = &get_cpu_var(tlb_batch);
struct mm_struct *mm = tb->mm;
if (!tb->tlb_nr)
goto out;
flush_tsb_user(tb);
if (CTX_VALID(mm->context)) {
if (tb->tlb_nr == 1) {
global_flush_tlb_page(mm, tb->vaddrs[0]);
} else {
#ifdef CONFIG_SMP
smp_flush_tlb_pending(tb->mm, tb->tlb_nr,
&tb->vaddrs[0]);
#else
__flush_tlb_pending(CTX_HWBITS(tb->mm->context),
tb->tlb_nr, &tb->vaddrs[0]);
#endif
}
}
tb->tlb_nr = 0;
out:
put_cpu_var(tlb_batch);
}
void arch_enter_lazy_mmu_mode(void)
{
struct tlb_batch *tb = &__get_cpu_var(tlb_batch);
tb->active = 1;
}
void arch_leave_lazy_mmu_mode(void)
{
struct tlb_batch *tb = &__get_cpu_var(tlb_batch);
if (tb->tlb_nr)
flush_tlb_pending();
tb->active = 0;
}
void tlb_batch_add(struct mm_struct *mm, unsigned long vaddr,
pte_t *ptep, pte_t orig, int fullmm)
{
struct tlb_batch *tb = &get_cpu_var(tlb_batch);
unsigned long nr;
vaddr &= PAGE_MASK;
if (pte_exec(orig))
vaddr |= 0x1UL;
if (tlb_type != hypervisor &&
pte_dirty(orig)) {
unsigned long paddr, pfn = pte_pfn(orig);
struct address_space *mapping;
struct page *page;
if (!pfn_valid(pfn))
goto no_cache_flush;
page = pfn_to_page(pfn);
if (PageReserved(page))
goto no_cache_flush;
/* A real file page? */
mapping = page_mapping(page);
if (!mapping)
goto no_cache_flush;
paddr = (unsigned long) page_address(page);
if ((paddr ^ vaddr) & (1 << 13))
flush_dcache_page_all(mm, page);
}
no_cache_flush:
if (fullmm) {
put_cpu_var(tlb_batch);
return;
}
nr = tb->tlb_nr;
if (unlikely(nr != 0 && mm != tb->mm)) {
flush_tlb_pending();
nr = 0;
}
if (!tb->active) {
flush_tsb_user_page(mm, vaddr);
global_flush_tlb_page(mm, vaddr);
goto out;
}
if (nr == 0)
tb->mm = mm;
tb->vaddrs[nr] = vaddr;
tb->tlb_nr = ++nr;
if (nr >= TLB_BATCH_NR)
flush_tlb_pending();
out:
put_cpu_var(tlb_batch);
}
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