Release 4.14 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->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;
		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 increase mm->nr_pmds */
		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
183
65.59%
12
63.16%
Gerald Schaefer
63
22.58%
1
5.26%
Christian Bornträger
8
2.87%
1
5.26%
Dominik Dingel
8
2.87%
2
10.53%
Claudio Imbrenda
8
2.87%
1
5.26%
Linus Torvalds (pre-git)
6
2.15%
1
5.26%
Heiko Carstens
3
1.08%
1
5.26%
Total
279
100.00%
19
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;
	if (current->thread.mm_segment.ar4)
		__ctl_load(S390_lowcore.user_asce, 7, 7);
	set_cpu_flag(CIF_ASCE_PRIMARY);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Martin Schwidefsky
30
62.50%
6
60.00%
Linus Torvalds (pre-git)
13
27.08%
1
10.00%
Andrew Morton
3
6.25%
1
10.00%
Gerald Schaefer
1
2.08%
1
10.00%
Heiko Carstens
1
2.08%
1
10.00%
Total
48
100.00%
10
100.00%



static inline void clear_user_asce(void)
{
	S390_lowcore.user_asce = S390_lowcore.kernel_asce;

	__ctl_load(S390_lowcore.user_asce, 1, 1);
	__ctl_load(S390_lowcore.user_asce, 7, 7);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Heiko Carstens
23
58.97%
1
33.33%
Martin Schwidefsky
16
41.03%
2
66.67%
Total
39
100.00%
3
100.00%



static inline void load_kernel_asce(void)
{
	unsigned long asce;

	__ctl_store(asce, 1, 1);
	if (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
Heiko Carstens
42
91.30%
2
40.00%
Martin Schwidefsky
4
8.70%
3
60.00%
Total
46
100.00%
5
100.00%



static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
			     struct task_struct *tsk)
{
	int cpu = smp_processor_id();

	S390_lowcore.user_asce = next->context.asce;
	if (prev == next)
		return;
	cpumask_set_cpu(cpu, &next->context.cpu_attach_mask);
	/* Clear old ASCE by loading the kernel ASCE. */
	__ctl_load(S390_lowcore.kernel_asce, 1, 1);
	__ctl_load(S390_lowcore.kernel_asce, 7, 7);
	cpumask_clear_cpu(cpu, &prev->context.cpu_attach_mask);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Martin Schwidefsky
86
93.48%
6
60.00%
Rusty Russell
2
2.17%
1
10.00%
Heiko Carstens
2
2.17%
1
10.00%
Linus Torvalds (pre-git)
1
1.09%
1
10.00%
Gerald Schaefer
1
1.09%
1
10.00%
Total
92
100.00%
10
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;

	load_kernel_asce();
	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
79
98.75%
7
87.50%
Linus Torvalds (pre-git)
1
1.25%
1
12.50%
Total
80
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
435
63.60%
21
50.00%
Heiko Carstens
72
10.53%
4
9.52%
Gerald Schaefer
69
10.09%
2
4.76%
Linus Torvalds (pre-git)
60
8.77%
1
2.38%
Linus Torvalds
10
1.46%
2
4.76%
Christian Bornträger
8
1.17%
1
2.38%
Claudio Imbrenda
8
1.17%
1
2.38%
Dominik Dingel
8
1.17%
2
4.76%
Andrew Morton
4
0.58%
2
4.76%
Ingo Molnar
3
0.44%
1
2.38%
Rusty Russell
2
0.29%
1
2.38%
Jeremy Fitzhardinge
2
0.29%
1
2.38%
Greg Kroah-Hartman
1
0.15%
1
2.38%
David Howells
1
0.15%
1
2.38%
Adrian Bunk
1
0.15%
1
2.38%
Total
684
100.00%
42
100.00%
Directory: arch/s390/include/asm

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.