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MIPS: Flush huge TLB

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When flushing TLB, if @vma is backed by huge page, we could flush huge
TLB, due to that huge page is defined to be far from normal page.

Signed-off-by: Hillf Danton <dhillf@gmail.com>
Acked-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: "Jayachandran C." <jayachandranc@netlogicmicro.com>
Patchwork: https://patchwork.linux-mips.org/patch/2825/
Signed-off-by: David Daney <david.daney@cavium.com>
Acked-by: Hillf Danton <dhillf@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/3114/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Hillf Danton 2012-01-11 15:37:13 +01:00 committed by Ralf Baechle
parent 8b5690f884
commit f467e4bfb5
2 changed files with 22 additions and 6 deletions
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8
arch/mips/include/asm/page.h
View file

@ -38,6 +38,14 @@
#define HPAGE_SIZE (_AC(1,UL) << HPAGE_SHIFT)
#define HPAGE_MASK (~(HPAGE_SIZE - 1))
#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
#else /* !CONFIG_HUGETLB_PAGE */
# ifndef BUILD_BUG
# define BUILD_BUG() do { extern void __build_bug(void); __build_bug(); } while (0)
# endif
#define HPAGE_SHIFT ({BUILD_BUG(); 0; })
#define HPAGE_SIZE ({BUILD_BUG(); 0; })
#define HPAGE_MASK ({BUILD_BUG(); 0; })
#define HUGETLB_PAGE_ORDER ({BUILD_BUG(); 0; })
#endif /* CONFIG_HUGETLB_PAGE */
#ifndef __ASSEMBLY__

20
arch/mips/mm/tlb-r4k.c
View file

@ -120,22 +120,30 @@ void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
if (cpu_context(cpu, mm) != 0) {
unsigned long size, flags;
int huge = is_vm_hugetlb_page(vma);
ENTER_CRITICAL(flags);
size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
size = (size + 1) >> 1;
if (huge) {
start = round_down(start, HPAGE_SIZE);
end = round_up(end, HPAGE_SIZE);
size = (end - start) >> HPAGE_SHIFT;
} else {
start = round_down(start, PAGE_SIZE << 1);
end = round_up(end, PAGE_SIZE << 1);
size = (end - start) >> (PAGE_SHIFT + 1);
}
if (size <= current_cpu_data.tlbsize/2) {
int oldpid = read_c0_entryhi();
int newpid = cpu_asid(cpu, mm);
start &= (PAGE_MASK << 1);
end += ((PAGE_SIZE << 1) - 1);
end &= (PAGE_MASK << 1);
while (start < end) {
int idx;
write_c0_entryhi(start | newpid);
start += (PAGE_SIZE << 1);
if (huge)
start += HPAGE_SIZE;
else
start += (PAGE_SIZE << 1);
mtc0_tlbw_hazard();
tlb_probe();
tlb_probe_hazard();