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s390/mm: convert pgste locking functions to C

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Convert pgste_get_lock() and pgste_set_unlock() to C.

There is no real reasons to keep them in assembler. Having them in C
makes them more readable and maintainable, and better instructions are
used automatically when available.

Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Acked-by: Alexander Gordeev <agordeev@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Link: https://lore.kernel.org/r/20231205173252.62305-1-imbrenda@linux.ibm.com
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Claudio Imbrenda 2023-12-05 18:32:52 +01:00 committed by Alexander Gordeev
parent 18564756ab
commit a6d27ea01a
1 changed files with 9 additions and 18 deletions
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27
arch/s390/mm/pgtable.c
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@ -125,32 +125,23 @@ static inline pte_t ptep_flush_lazy(struct mm_struct *mm,
static inline pgste_t pgste_get_lock(pte_t *ptep)
{
unsigned long new = 0;
unsigned long value = 0;
#ifdef CONFIG_PGSTE
unsigned long old;
unsigned long *ptr = (unsigned long *)(ptep + PTRS_PER_PTE);
asm(
" lg %0,%2\n"
"0: lgr %1,%0\n"
" nihh %0,0xff7f\n" /* clear PCL bit in old */
" oihh %1,0x0080\n" /* set PCL bit in new */
" csg %0,%1,%2\n"
" jl 0b\n"
: "=&d" (old), "=&d" (new), "=Q" (ptep[PTRS_PER_PTE])
: "Q" (ptep[PTRS_PER_PTE]) : "cc", "memory");
do {
value = __atomic64_or_barrier(PGSTE_PCL_BIT, ptr);
} while (value & PGSTE_PCL_BIT);
value |= PGSTE_PCL_BIT;
#endif
return __pgste(new);
return __pgste(value);
}
static inline void pgste_set_unlock(pte_t *ptep, pgste_t pgste)
{
#ifdef CONFIG_PGSTE
asm(
" nihh %1,0xff7f\n" /* clear PCL bit */
" stg %1,%0\n"
: "=Q" (ptep[PTRS_PER_PTE])
: "d" (pgste_val(pgste)), "Q" (ptep[PTRS_PER_PTE])
: "cc", "memory");
barrier();
WRITE_ONCE(*(unsigned long *)(ptep + PTRS_PER_PTE), pgste_val(pgste) & ~PGSTE_PCL_BIT);
#endif
}