141 lines
3.3 KiB
C
141 lines
3.3 KiB
C
#ifndef _S390_TLBFLUSH_H
|
|
#define _S390_TLBFLUSH_H
|
|
|
|
#include <linux/mm.h>
|
|
#include <linux/sched.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/pgalloc.h>
|
|
|
|
/*
|
|
* Flush all tlb entries on the local cpu.
|
|
*/
|
|
static inline void __tlb_flush_local(void)
|
|
{
|
|
asm volatile("ptlb" : : : "memory");
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
/*
|
|
* Flush all tlb entries on all cpus.
|
|
*/
|
|
void smp_ptlb_all(void);
|
|
|
|
static inline void __tlb_flush_global(void)
|
|
{
|
|
register unsigned long reg2 asm("2");
|
|
register unsigned long reg3 asm("3");
|
|
register unsigned long reg4 asm("4");
|
|
long dummy;
|
|
|
|
#ifndef __s390x__
|
|
if (!MACHINE_HAS_CSP) {
|
|
smp_ptlb_all();
|
|
return;
|
|
}
|
|
#endif /* __s390x__ */
|
|
|
|
dummy = 0;
|
|
reg2 = reg3 = 0;
|
|
reg4 = ((unsigned long) &dummy) + 1;
|
|
asm volatile(
|
|
" csp %0,%2"
|
|
: : "d" (reg2), "d" (reg3), "d" (reg4), "m" (dummy) : "cc" );
|
|
}
|
|
|
|
static inline void __tlb_flush_full(struct mm_struct *mm)
|
|
{
|
|
cpumask_t local_cpumask;
|
|
|
|
preempt_disable();
|
|
/*
|
|
* If the process only ran on the local cpu, do a local flush.
|
|
*/
|
|
local_cpumask = cpumask_of_cpu(smp_processor_id());
|
|
if (cpumask_equal(mm_cpumask(mm), &local_cpumask))
|
|
__tlb_flush_local();
|
|
else
|
|
__tlb_flush_global();
|
|
preempt_enable();
|
|
}
|
|
#else
|
|
#define __tlb_flush_full(mm) __tlb_flush_local()
|
|
#endif
|
|
|
|
/*
|
|
* Flush all tlb entries of a page table on all cpus.
|
|
*/
|
|
static inline void __tlb_flush_idte(unsigned long asce)
|
|
{
|
|
asm volatile(
|
|
" .insn rrf,0xb98e0000,0,%0,%1,0"
|
|
: : "a" (2048), "a" (asce) : "cc" );
|
|
}
|
|
|
|
static inline void __tlb_flush_mm(struct mm_struct * mm)
|
|
{
|
|
if (unlikely(cpumask_empty(mm_cpumask(mm))))
|
|
return;
|
|
/*
|
|
* If the machine has IDTE we prefer to do a per mm flush
|
|
* on all cpus instead of doing a local flush if the mm
|
|
* only ran on the local cpu.
|
|
*/
|
|
if (MACHINE_HAS_IDTE) {
|
|
if (mm->context.noexec)
|
|
__tlb_flush_idte((unsigned long)
|
|
get_shadow_table(mm->pgd) |
|
|
mm->context.asce_bits);
|
|
__tlb_flush_idte((unsigned long) mm->pgd |
|
|
mm->context.asce_bits);
|
|
return;
|
|
}
|
|
__tlb_flush_full(mm);
|
|
}
|
|
|
|
static inline void __tlb_flush_mm_cond(struct mm_struct * mm)
|
|
{
|
|
if (atomic_read(&mm->mm_users) <= 1 && mm == current->active_mm)
|
|
__tlb_flush_mm(mm);
|
|
}
|
|
|
|
/*
|
|
* TLB flushing:
|
|
* flush_tlb() - flushes the current mm struct TLBs
|
|
* flush_tlb_all() - flushes all processes TLBs
|
|
* flush_tlb_mm(mm) - flushes the specified mm context TLB's
|
|
* flush_tlb_page(vma, vmaddr) - flushes one page
|
|
* flush_tlb_range(vma, start, end) - flushes a range of pages
|
|
* flush_tlb_kernel_range(start, end) - flushes a range of kernel pages
|
|
*/
|
|
|
|
/*
|
|
* flush_tlb_mm goes together with ptep_set_wrprotect for the
|
|
* copy_page_range operation and flush_tlb_range is related to
|
|
* ptep_get_and_clear for change_protection. ptep_set_wrprotect and
|
|
* ptep_get_and_clear do not flush the TLBs directly if the mm has
|
|
* only one user. At the end of the update the flush_tlb_mm and
|
|
* flush_tlb_range functions need to do the flush.
|
|
*/
|
|
#define flush_tlb() do { } while (0)
|
|
#define flush_tlb_all() do { } while (0)
|
|
#define flush_tlb_page(vma, addr) do { } while (0)
|
|
|
|
static inline void flush_tlb_mm(struct mm_struct *mm)
|
|
{
|
|
__tlb_flush_mm_cond(mm);
|
|
}
|
|
|
|
static inline void flush_tlb_range(struct vm_area_struct *vma,
|
|
unsigned long start, unsigned long end)
|
|
{
|
|
__tlb_flush_mm_cond(vma->vm_mm);
|
|
}
|
|
|
|
static inline void flush_tlb_kernel_range(unsigned long start,
|
|
unsigned long end)
|
|
{
|
|
__tlb_flush_mm(&init_mm);
|
|
}
|
|
|
|
#endif /* _S390_TLBFLUSH_H */
|