162 lines
3.7 KiB
C
162 lines
3.7 KiB
C
#ifndef _S390_TLBFLUSH_H
|
|
#define _S390_TLBFLUSH_H
|
|
|
|
#include <linux/mm.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/pgalloc.h>
|
|
|
|
/*
|
|
* 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_pgtables(mm, start, end) flushes a range of page tables
|
|
*/
|
|
|
|
/*
|
|
* S/390 has three ways of flushing TLBs
|
|
* 'ptlb' does a flush of the local processor
|
|
* 'csp' flushes the TLBs on all PUs of a SMP
|
|
* 'ipte' invalidates a pte in a page table and flushes that out of
|
|
* the TLBs of all PUs of a SMP
|
|
*/
|
|
|
|
#define local_flush_tlb() \
|
|
do { asm volatile("ptlb": : :"memory"); } while (0)
|
|
|
|
#ifndef CONFIG_SMP
|
|
|
|
/*
|
|
* We always need to flush, since s390 does not flush tlb
|
|
* on each context switch
|
|
*/
|
|
|
|
static inline void flush_tlb(void)
|
|
{
|
|
local_flush_tlb();
|
|
}
|
|
static inline void flush_tlb_all(void)
|
|
{
|
|
local_flush_tlb();
|
|
}
|
|
static inline void flush_tlb_mm(struct mm_struct *mm)
|
|
{
|
|
local_flush_tlb();
|
|
}
|
|
static inline void flush_tlb_page(struct vm_area_struct *vma,
|
|
unsigned long addr)
|
|
{
|
|
local_flush_tlb();
|
|
}
|
|
static inline void flush_tlb_range(struct vm_area_struct *vma,
|
|
unsigned long start, unsigned long end)
|
|
{
|
|
local_flush_tlb();
|
|
}
|
|
|
|
#define flush_tlb_kernel_range(start, end) \
|
|
local_flush_tlb();
|
|
|
|
#else
|
|
|
|
#include <asm/smp.h>
|
|
|
|
extern void smp_ptlb_all(void);
|
|
|
|
static inline void global_flush_tlb(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" );
|
|
}
|
|
|
|
/*
|
|
* We only have to do global flush of tlb if process run since last
|
|
* flush on any other pu than current.
|
|
* If we have threads (mm->count > 1) we always do a global flush,
|
|
* since the process runs on more than one processor at the same time.
|
|
*/
|
|
|
|
static inline void __flush_tlb_mm(struct mm_struct * mm)
|
|
{
|
|
cpumask_t local_cpumask;
|
|
|
|
if (unlikely(cpus_empty(mm->cpu_vm_mask)))
|
|
return;
|
|
if (MACHINE_HAS_IDTE) {
|
|
pgd_t *shadow_pgd = get_shadow_pgd(mm->pgd);
|
|
|
|
if (shadow_pgd) {
|
|
asm volatile(
|
|
" .insn rrf,0xb98e0000,0,%0,%1,0"
|
|
: : "a" (2048),
|
|
"a" (__pa(shadow_pgd) & PAGE_MASK) : "cc" );
|
|
}
|
|
asm volatile(
|
|
" .insn rrf,0xb98e0000,0,%0,%1,0"
|
|
: : "a" (2048), "a" (__pa(mm->pgd)&PAGE_MASK) : "cc");
|
|
return;
|
|
}
|
|
preempt_disable();
|
|
local_cpumask = cpumask_of_cpu(smp_processor_id());
|
|
if (cpus_equal(mm->cpu_vm_mask, local_cpumask))
|
|
local_flush_tlb();
|
|
else
|
|
global_flush_tlb();
|
|
preempt_enable();
|
|
}
|
|
|
|
static inline void flush_tlb(void)
|
|
{
|
|
__flush_tlb_mm(current->mm);
|
|
}
|
|
static inline void flush_tlb_all(void)
|
|
{
|
|
global_flush_tlb();
|
|
}
|
|
static inline void flush_tlb_mm(struct mm_struct *mm)
|
|
{
|
|
__flush_tlb_mm(mm);
|
|
}
|
|
static inline void flush_tlb_page(struct vm_area_struct *vma,
|
|
unsigned long addr)
|
|
{
|
|
__flush_tlb_mm(vma->vm_mm);
|
|
}
|
|
static inline void flush_tlb_range(struct vm_area_struct *vma,
|
|
unsigned long start, unsigned long end)
|
|
{
|
|
__flush_tlb_mm(vma->vm_mm);
|
|
}
|
|
|
|
#define flush_tlb_kernel_range(start, end) global_flush_tlb()
|
|
|
|
#endif
|
|
|
|
static inline void flush_tlb_pgtables(struct mm_struct *mm,
|
|
unsigned long start, unsigned long end)
|
|
{
|
|
/* S/390 does not keep any page table caches in TLB */
|
|
}
|
|
|
|
#endif /* _S390_TLBFLUSH_H */
|