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xtensa: optimize local_flush_tlb_kernel_range 

Don't flush whole TLB if only a small kernel range is requested.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
hifive-unleashed-5.1
Max Filippov 2014-02-14 14:08:48 +04:00
parent 8585b316bb
commit 04c6b3e2b5
3 changed files with 34 additions and 7 deletions
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11
arch/xtensa/include/asm/tlbflush.h
View File

@ -36,6 +36,7 @@ void local_flush_tlb_page(struct vm_area_struct *vma,
unsigned long page);
void local_flush_tlb_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end);
void local_flush_tlb_kernel_range(unsigned long start, unsigned long end);
#ifdef CONFIG_SMP
@ -44,12 +45,7 @@ void flush_tlb_mm(struct mm_struct *);
void flush_tlb_page(struct vm_area_struct *, unsigned long);
void flush_tlb_range(struct vm_area_struct *, unsigned long,
unsigned long);
static inline void flush_tlb_kernel_range(unsigned long start,
unsigned long end)
{
flush_tlb_all();
}
void flush_tlb_kernel_range(unsigned long start, unsigned long end);
#else /* !CONFIG_SMP */
@ -58,7 +54,8 @@ static inline void flush_tlb_kernel_range(unsigned long start,
#define flush_tlb_page(vma, page) local_flush_tlb_page(vma, page)
#define flush_tlb_range(vma, vmaddr, end) local_flush_tlb_range(vma, vmaddr, \
end)
#define flush_tlb_kernel_range(start, end) local_flush_tlb_all()
#define flush_tlb_kernel_range(start, end) local_flush_tlb_kernel_range(start, \
end)
#endif /* CONFIG_SMP */

15
arch/xtensa/kernel/smp.c
View File

@ -496,6 +496,21 @@ void flush_tlb_range(struct vm_area_struct *vma,
on_each_cpu(ipi_flush_tlb_range, &fd, 1);
}
static void ipi_flush_tlb_kernel_range(void *arg)
{
struct flush_data *fd = arg;
local_flush_tlb_kernel_range(fd->addr1, fd->addr2);
}
void flush_tlb_kernel_range(unsigned long start, unsigned long end)
{
struct flush_data fd = {
.addr1 = start,
.addr2 = end,
};
on_each_cpu(ipi_flush_tlb_kernel_range, &fd, 1);
}
/* Cache flush functions */
static void ipi_flush_cache_all(void *arg)

15
arch/xtensa/mm/tlb.c
View File

@ -149,6 +149,21 @@ void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
local_irq_restore(flags);
}
void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
{
if (end > start && start >= TASK_SIZE && end <= PAGE_OFFSET &&
end - start < _TLB_ENTRIES << PAGE_SHIFT) {
start &= PAGE_MASK;
while (start < end) {
invalidate_itlb_mapping(start);
invalidate_dtlb_mapping(start);
start += PAGE_SIZE;
}
} else {
local_flush_tlb_all();
}
}
#ifdef CONFIG_DEBUG_TLB_SANITY
static unsigned get_pte_for_vaddr(unsigned vaddr)