Viewing file:  tlbflush.h (2.93 KB) -rw-r--r--
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#ifndef _S390_TLBFLUSH_H
#define _S390_TLBFLUSH_H
#include <linux/mm.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");
}
/*
* Flush all tlb entries on all cpus.
*/
static inline void __tlb_flush_global(void)
{
extern void smp_ptlb_all(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" );
}
/*
* Flush all tlb entries of a page table on all cpus.
*/
static inline void __tlb_flush_idte(pgd_t *pgd)
{
asm volatile(
" .insn rrf,0xb98e0000,0,%0,%1,0"
: : "a" (2048), "a" (__pa(pgd) & PAGE_MASK) : "cc" );
}
static inline void __tlb_flush_mm(struct mm_struct * mm)
{
cpumask_t local_cpumask;
if (unlikely(cpus_empty(mm->cpu_vm_mask)))
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) {
pgd_t *shadow_pgd = get_shadow_table(mm->pgd);
if (shadow_pgd)
__tlb_flush_idte(shadow_pgd);
__tlb_flush_idte(mm->pgd);
return;
}
preempt_disable();
/*
* If the process only ran on the local cpu, do a local flush.
*/
local_cpumask = cpumask_of_cpu(smp_processor_id());
if (cpus_equal(mm->cpu_vm_mask, local_cpumask))
__tlb_flush_local();
else
__tlb_flush_global();
preempt_enable();
}
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_mm(mm) __tlb_flush_mm_cond(mm)
#define flush_tlb_page(vma, addr) do { } while (0)
#define flush_tlb_range(vma, start, end) __tlb_flush_mm_cond(mm)
#define flush_tlb_kernel_range(start, end) __tlb_flush_mm(&init_mm)
#endif /* _S390_TLBFLUSH_H */
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