Release 4.15 arch/s390/include/asm/mmu_context.h
/* SPDX-License-Identifier: GPL-2.0 */
/*
* S390 version
*
* Derived from "include/asm-i386/mmu_context.h"
*/
#ifndef __S390_MMU_CONTEXT_H
#define __S390_MMU_CONTEXT_H
#include <asm/pgalloc.h>
#include <linux/uaccess.h>
#include <linux/mm_types.h>
#include <asm/tlbflush.h>
#include <asm/ctl_reg.h>
#include <asm-generic/mm_hooks.h>
static inline int init_new_context(struct task_struct *tsk,
struct mm_struct *mm)
{
spin_lock_init(&mm->context.lock);
INIT_LIST_HEAD(&mm->context.pgtable_list);
INIT_LIST_HEAD(&mm->context.gmap_list);
cpumask_clear(&mm->context.cpu_attach_mask);
atomic_set(&mm->context.flush_count, 0);
mm->context.gmap_asce = 0;
mm->context.flush_mm = 0;
#ifdef CONFIG_PGSTE
mm->context.alloc_pgste = page_table_allocate_pgste ||
test_thread_flag(TIF_PGSTE) ||
(current->mm && current->mm->context.alloc_pgste);
mm->context.has_pgste = 0;
mm->context.use_skey = 0;
mm->context.use_cmma = 0;
#endif
switch (mm->context.asce_limit) {
case _REGION2_SIZE:
/*
* forked 3-level task, fall through to set new asce with new
* mm->pgd
*/
case 0:
/* context created by exec, set asce limit to 4TB */
mm->context.asce_limit = STACK_TOP_MAX;
mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH |
_ASCE_USER_BITS | _ASCE_TYPE_REGION3;
/* pgd_alloc() did not account this pud */
mm_inc_nr_puds(mm);
break;
case -PAGE_SIZE:
/* forked 5-level task, set new asce with new_mm->pgd */
mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH |
_ASCE_USER_BITS | _ASCE_TYPE_REGION1;
break;
case _REGION1_SIZE:
/* forked 4-level task, set new asce with new mm->pgd */
mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH |
_ASCE_USER_BITS | _ASCE_TYPE_REGION2;
break;
case _REGION3_SIZE:
/* forked 2-level compat task, set new asce with new mm->pgd */
mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH |
_ASCE_USER_BITS | _ASCE_TYPE_SEGMENT;
/* pgd_alloc() did not account this pmd */
mm_inc_nr_pmds(mm);
}
crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm));
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Martin Schwidefsky | 189 | 64.95% | 13 | 61.90% |
| Gerald Schaefer | 62 | 21.31% | 1 | 4.76% |
| Claudio Imbrenda | 8 | 2.75% | 1 | 4.76% |
| Christian Bornträger | 8 | 2.75% | 1 | 4.76% |
| Dominik Dingel | 8 | 2.75% | 2 | 9.52% |
| Kirill A. Shutemov | 7 | 2.41% | 1 | 4.76% |
| Linus Torvalds (pre-git) | 6 | 2.06% | 1 | 4.76% |
| Heiko Carstens | 3 | 1.03% | 1 | 4.76% |
| Total | 291 | 100.00% | 21 | 100.00% |
#define destroy_context(mm) do { } while (0)
static inline void set_user_asce(struct mm_struct *mm)
{
S390_lowcore.user_asce = mm->context.asce;
__ctl_load(S390_lowcore.user_asce, 1, 1);
clear_cpu_flag(CIF_ASCE_PRIMARY);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Martin Schwidefsky | 20 | 52.63% | 6 | 60.00% |
| Linus Torvalds (pre-git) | 13 | 34.21% | 1 | 10.00% |
| Andrew Morton | 3 | 7.89% | 1 | 10.00% |
| Gerald Schaefer | 1 | 2.63% | 1 | 10.00% |
| Heiko Carstens | 1 | 2.63% | 1 | 10.00% |
| Total | 38 | 100.00% | 10 | 100.00% |
static inline void clear_user_asce(void)
{
S390_lowcore.user_asce = S390_lowcore.kernel_asce;
__ctl_load(S390_lowcore.kernel_asce, 1, 1);
set_cpu_flag(CIF_ASCE_PRIMARY);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Martin Schwidefsky | 19 | 57.58% | 3 | 75.00% |
| Heiko Carstens | 14 | 42.42% | 1 | 25.00% |
| Total | 33 | 100.00% | 4 | 100.00% |
mm_segment_t enable_sacf_uaccess(void);
void disable_sacf_uaccess(mm_segment_t old_fs);
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *tsk)
{
int cpu = smp_processor_id();
if (prev == next)
return;
S390_lowcore.user_asce = next->context.asce;
cpumask_set_cpu(cpu, &next->context.cpu_attach_mask);
/* Clear previous user-ASCE from CR1 and CR7 */
if (!test_cpu_flag(CIF_ASCE_PRIMARY)) {
__ctl_load(S390_lowcore.kernel_asce, 1, 1);
set_cpu_flag(CIF_ASCE_PRIMARY);
}
if (test_cpu_flag(CIF_ASCE_SECONDARY)) {
__ctl_load(S390_lowcore.vdso_asce, 7, 7);
clear_cpu_flag(CIF_ASCE_SECONDARY);
}
cpumask_clear_cpu(cpu, &prev->context.cpu_attach_mask);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Martin Schwidefsky | 115 | 95.04% | 7 | 63.64% |
| Rusty Russell | 2 | 1.65% | 1 | 9.09% |
| Heiko Carstens | 2 | 1.65% | 1 | 9.09% |
| Linus Torvalds (pre-git) | 1 | 0.83% | 1 | 9.09% |
| Gerald Schaefer | 1 | 0.83% | 1 | 9.09% |
| Total | 121 | 100.00% | 11 | 100.00% |
#define finish_arch_post_lock_switch finish_arch_post_lock_switch
static inline void finish_arch_post_lock_switch(void)
{
struct task_struct *tsk = current;
struct mm_struct *mm = tsk->mm;
if (mm) {
preempt_disable();
while (atomic_read(&mm->context.flush_count))
cpu_relax();
cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm));
__tlb_flush_mm_lazy(mm);
preempt_enable();
}
set_fs(current->thread.mm_segment);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Martin Schwidefsky | 76 | 98.70% | 7 | 87.50% |
| Linus Torvalds (pre-git) | 1 | 1.30% | 1 | 12.50% |
| Total | 77 | 100.00% | 8 | 100.00% |
#define enter_lazy_tlb(mm,tsk) do { } while (0)
#define deactivate_mm(tsk,mm) do { } while (0)
static inline void activate_mm(struct mm_struct *prev,
struct mm_struct *next)
{
switch_mm(prev, next, current);
cpumask_set_cpu(smp_processor_id(), mm_cpumask(next));
set_user_asce(next);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 25 | 59.52% | 1 | 25.00% |
| Martin Schwidefsky | 16 | 38.10% | 2 | 50.00% |
| Adrian Bunk | 1 | 2.38% | 1 | 25.00% |
| Total | 42 | 100.00% | 4 | 100.00% |
#endif /* __S390_MMU_CONTEXT_H */
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Martin Schwidefsky | 467 | 69.39% | 22 | 50.00% |
| Gerald Schaefer | 68 | 10.10% | 2 | 4.55% |
| Linus Torvalds (pre-git) | 60 | 8.92% | 1 | 2.27% |
| Heiko Carstens | 23 | 3.42% | 4 | 9.09% |
| Linus Torvalds | 10 | 1.49% | 2 | 4.55% |
| Dominik Dingel | 8 | 1.19% | 2 | 4.55% |
| Christian Bornträger | 8 | 1.19% | 1 | 2.27% |
| Claudio Imbrenda | 8 | 1.19% | 1 | 2.27% |
| Kirill A. Shutemov | 7 | 1.04% | 1 | 2.27% |
| Andrew Morton | 4 | 0.59% | 2 | 4.55% |
| Ingo Molnar | 3 | 0.45% | 1 | 2.27% |
| Rusty Russell | 2 | 0.30% | 1 | 2.27% |
| Jeremy Fitzhardinge | 2 | 0.30% | 1 | 2.27% |
| Adrian Bunk | 1 | 0.15% | 1 | 2.27% |
| Greg Kroah-Hartman | 1 | 0.15% | 1 | 2.27% |
| David Howells | 1 | 0.15% | 1 | 2.27% |
| Total | 673 | 100.00% | 44 | 100.00% |
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