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[S390] Fix tlb flushing with idte.

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The clear-by-asce operation of the idte instruction gets an asce
(address-space-control-element) as argument to specify which TLBs
need to get flushed. The current code passes a plain pointer to
the start of the pgd without the additional bits which would make
the pointer an asce. The current machines don't mind the difference
but a future model might want to use the designation type control
bits in the asce as a filter for the TLBs to flush.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2008-01-26 14:10:58 +01:00
parent 4b28a8fe78
commit 6f457e1a14
3 changed files with 19 additions and 22 deletions
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2
arch/s390/kernel/head64.S
View file

@ -157,7 +157,7 @@ startup_continue:
.long 0xb2b10000 # store facility list
tm 0xc8,0x08 # check bit for clearing-by-ASCE
bno 0f-.LPG1(%r13)
lhi %r1,2094
lhi %r1,2048
lhi %r2,0
.long 0xb98e2001
oi 7(%r12),0x80 # set IDTE flag

27
include/asm-s390/mmu_context.h
View file

@ -12,10 +12,15 @@
#include <asm/pgalloc.h>
#include <asm-generic/mm_hooks.h>
/*
* get a new mmu context.. S390 don't know about contexts.
*/
#define init_new_context(tsk,mm) 0
static inline int init_new_context(struct task_struct *tsk,
struct mm_struct *mm)
{
mm->context = _ASCE_TABLE_LENGTH | _ASCE_USER_BITS;
#ifdef CONFIG_64BIT
mm->context |= _ASCE_TYPE_REGION3;
#endif
return 0;
}
#define destroy_context(mm) do { } while (0)
@ -27,19 +32,11 @@
static inline void update_mm(struct mm_struct *mm, struct task_struct *tsk)
{
pgd_t *pgd = mm->pgd;
unsigned long asce_bits;
/* Calculate asce bits from the first pgd table entry. */
asce_bits = _ASCE_TABLE_LENGTH | _ASCE_USER_BITS;
#ifdef CONFIG_64BIT
asce_bits |= _ASCE_TYPE_REGION3;
#endif
S390_lowcore.user_asce = asce_bits | __pa(pgd);
S390_lowcore.user_asce = mm->context | __pa(mm->pgd);
if (switch_amode) {
/* Load primary space page table origin. */
pgd_t *shadow_pgd = get_shadow_table(pgd) ? : pgd;
S390_lowcore.user_exec_asce = asce_bits | __pa(shadow_pgd);
pgd_t *shadow_pgd = get_shadow_table(mm->pgd) ? : mm->pgd;
S390_lowcore.user_exec_asce = mm->context | __pa(shadow_pgd);
asm volatile(LCTL_OPCODE" 1,1,%0\n"
: : "m" (S390_lowcore.user_exec_asce) );
} else

12
include/asm-s390/tlbflush.h
View file

@ -42,11 +42,11 @@ static inline void __tlb_flush_global(void)
/*
* Flush all tlb entries of a page table on all cpus.
*/
static inline void __tlb_flush_idte(pgd_t *pgd)
static inline void __tlb_flush_idte(unsigned long asce)
{
asm volatile(
" .insn rrf,0xb98e0000,0,%0,%1,0"
: : "a" (2048), "a" (__pa(pgd) & PAGE_MASK) : "cc" );
: : "a" (2048), "a" (asce) : "cc" );
}
static inline void __tlb_flush_mm(struct mm_struct * mm)
@ -61,11 +61,11 @@ static inline void __tlb_flush_mm(struct mm_struct * mm)
* only ran on the local cpu.
*/
if (MACHINE_HAS_IDTE) {
pgd_t *shadow_pgd = get_shadow_table(mm->pgd);
pgd_t *shadow = get_shadow_table(mm->pgd);
if (shadow_pgd)
__tlb_flush_idte(shadow_pgd);
__tlb_flush_idte(mm->pgd);
if (shadow)
__tlb_flush_idte((unsigned long) shadow | mm->context);
__tlb_flush_idte((unsigned long) mm->pgd | mm->context);
return;
}
preempt_disable();