Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * S390 version |
| 3 | * |
| 4 | * Derived from "include/asm-i386/mmu_context.h" |
| 5 | */ |
| 6 | |
| 7 | #ifndef __S390_MMU_CONTEXT_H |
| 8 | #define __S390_MMU_CONTEXT_H |
| 9 | |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 10 | #include <asm/pgalloc.h> |
Martin Schwidefsky | 146e4b3 | 2008-02-09 18:24:35 +0100 | [diff] [blame] | 11 | #include <asm/uaccess.h> |
Martin Schwidefsky | 050eef3 | 2010-08-24 09:26:21 +0200 | [diff] [blame] | 12 | #include <asm/tlbflush.h> |
David Howells | a0616cd | 2012-03-28 18:30:02 +0100 | [diff] [blame] | 13 | #include <asm/ctl_reg.h> |
Jeremy Fitzhardinge | d6dd61c | 2007-05-02 19:27:14 +0200 | [diff] [blame] | 14 | |
Martin Schwidefsky | 6f457e1 | 2008-01-26 14:10:58 +0100 | [diff] [blame] | 15 | static inline int init_new_context(struct task_struct *tsk, |
| 16 | struct mm_struct *mm) |
| 17 | { |
Martin Schwidefsky | 3446c13 | 2016-02-15 14:46:49 +0100 | [diff] [blame] | 18 | spin_lock_init(&mm->context.list_lock); |
| 19 | INIT_LIST_HEAD(&mm->context.pgtable_list); |
| 20 | INIT_LIST_HEAD(&mm->context.gmap_list); |
Martin Schwidefsky | 1b948d6 | 2014-04-03 13:55:01 +0200 | [diff] [blame] | 21 | cpumask_clear(&mm->context.cpu_attach_mask); |
Martin Schwidefsky | 050eef3 | 2010-08-24 09:26:21 +0200 | [diff] [blame] | 22 | atomic_set(&mm->context.attach_count, 0); |
| 23 | mm->context.flush_mm = 0; |
Martin Schwidefsky | 0b46e0a | 2015-04-15 13:23:26 +0200 | [diff] [blame] | 24 | #ifdef CONFIG_PGSTE |
| 25 | mm->context.alloc_pgste = page_table_allocate_pgste; |
Martin Schwidefsky | 3eabaee | 2013-07-26 15:04:02 +0200 | [diff] [blame] | 26 | mm->context.has_pgste = 0; |
Dominik Dingel | 693ffc0 | 2014-01-14 18:11:14 +0100 | [diff] [blame] | 27 | mm->context.use_skey = 0; |
Martin Schwidefsky | 0b46e0a | 2015-04-15 13:23:26 +0200 | [diff] [blame] | 28 | #endif |
Gerald Schaefer | 723cacb | 2016-04-15 16:38:40 +0200 | [diff] [blame] | 29 | switch (mm->context.asce_limit) { |
| 30 | case 1UL << 42: |
| 31 | /* |
| 32 | * forked 3-level task, fall through to set new asce with new |
| 33 | * mm->pgd |
| 34 | */ |
| 35 | case 0: |
Martin Schwidefsky | 3446c13 | 2016-02-15 14:46:49 +0100 | [diff] [blame] | 36 | /* context created by exec, set asce limit to 4TB */ |
Martin Schwidefsky | 3446c13 | 2016-02-15 14:46:49 +0100 | [diff] [blame] | 37 | mm->context.asce_limit = STACK_TOP_MAX; |
Gerald Schaefer | 723cacb | 2016-04-15 16:38:40 +0200 | [diff] [blame] | 38 | mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH | |
| 39 | _ASCE_USER_BITS | _ASCE_TYPE_REGION3; |
| 40 | break; |
| 41 | case 1UL << 53: |
| 42 | /* forked 4-level task, set new asce with new mm->pgd */ |
| 43 | mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH | |
| 44 | _ASCE_USER_BITS | _ASCE_TYPE_REGION2; |
| 45 | break; |
| 46 | case 1UL << 31: |
| 47 | /* forked 2-level compat task, set new asce with new mm->pgd */ |
| 48 | mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH | |
| 49 | _ASCE_USER_BITS | _ASCE_TYPE_SEGMENT; |
| 50 | /* pgd_alloc() did not increase mm->nr_pmds */ |
Martin Schwidefsky | 3446c13 | 2016-02-15 14:46:49 +0100 | [diff] [blame] | 51 | mm_inc_nr_pmds(mm); |
| 52 | } |
Martin Schwidefsky | 6252d70 | 2008-02-09 18:24:37 +0100 | [diff] [blame] | 53 | crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm)); |
Martin Schwidefsky | 6f457e1 | 2008-01-26 14:10:58 +0100 | [diff] [blame] | 54 | return 0; |
| 55 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
| 57 | #define destroy_context(mm) do { } while (0) |
| 58 | |
Martin Schwidefsky | beef560 | 2014-04-14 15:11:26 +0200 | [diff] [blame] | 59 | static inline void set_user_asce(struct mm_struct *mm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | { |
Gerald Schaefer | 723cacb | 2016-04-15 16:38:40 +0200 | [diff] [blame] | 61 | S390_lowcore.user_asce = mm->context.asce; |
Martin Schwidefsky | f8b1350 | 2014-06-02 14:53:57 +0200 | [diff] [blame] | 62 | if (current->thread.mm_segment.ar4) |
| 63 | __ctl_load(S390_lowcore.user_asce, 7, 7); |
Martin Schwidefsky | d3a73ac | 2014-04-15 12:55:07 +0200 | [diff] [blame] | 64 | set_cpu_flag(CIF_ASCE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | } |
| 66 | |
Martin Schwidefsky | beef560 | 2014-04-14 15:11:26 +0200 | [diff] [blame] | 67 | static inline void clear_user_asce(void) |
Martin Schwidefsky | 02a8f3a | 2014-04-03 13:54:59 +0200 | [diff] [blame] | 68 | { |
| 69 | S390_lowcore.user_asce = S390_lowcore.kernel_asce; |
Heiko Carstens | 457f218 | 2014-03-21 10:42:25 +0100 | [diff] [blame] | 70 | |
Martin Schwidefsky | beef560 | 2014-04-14 15:11:26 +0200 | [diff] [blame] | 71 | __ctl_load(S390_lowcore.user_asce, 1, 1); |
Heiko Carstens | 457f218 | 2014-03-21 10:42:25 +0100 | [diff] [blame] | 72 | __ctl_load(S390_lowcore.user_asce, 7, 7); |
| 73 | } |
| 74 | |
Martin Schwidefsky | beef560 | 2014-04-14 15:11:26 +0200 | [diff] [blame] | 75 | static inline void load_kernel_asce(void) |
Heiko Carstens | 457f218 | 2014-03-21 10:42:25 +0100 | [diff] [blame] | 76 | { |
| 77 | unsigned long asce; |
| 78 | |
| 79 | __ctl_store(asce, 1, 1); |
| 80 | if (asce != S390_lowcore.kernel_asce) |
| 81 | __ctl_load(S390_lowcore.kernel_asce, 1, 1); |
Martin Schwidefsky | d3a73ac | 2014-04-15 12:55:07 +0200 | [diff] [blame] | 82 | set_cpu_flag(CIF_ASCE); |
Martin Schwidefsky | 02a8f3a | 2014-04-03 13:54:59 +0200 | [diff] [blame] | 83 | } |
| 84 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 86 | struct task_struct *tsk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | { |
Martin Schwidefsky | 53e857f | 2012-09-10 13:00:09 +0200 | [diff] [blame] | 88 | int cpu = smp_processor_id(); |
| 89 | |
Gerald Schaefer | 723cacb | 2016-04-15 16:38:40 +0200 | [diff] [blame] | 90 | S390_lowcore.user_asce = next->context.asce; |
Martin Schwidefsky | 53e857f | 2012-09-10 13:00:09 +0200 | [diff] [blame] | 91 | if (prev == next) |
| 92 | return; |
Martin Schwidefsky | 1b948d6 | 2014-04-03 13:55:01 +0200 | [diff] [blame] | 93 | if (MACHINE_HAS_TLB_LC) |
| 94 | cpumask_set_cpu(cpu, &next->context.cpu_attach_mask); |
Martin Schwidefsky | beef560 | 2014-04-14 15:11:26 +0200 | [diff] [blame] | 95 | /* Clear old ASCE by loading the kernel ASCE. */ |
| 96 | __ctl_load(S390_lowcore.kernel_asce, 1, 1); |
| 97 | __ctl_load(S390_lowcore.kernel_asce, 7, 7); |
Martin Schwidefsky | beef560 | 2014-04-14 15:11:26 +0200 | [diff] [blame] | 98 | atomic_inc(&next->context.attach_count); |
Martin Schwidefsky | 050eef3 | 2010-08-24 09:26:21 +0200 | [diff] [blame] | 99 | atomic_dec(&prev->context.attach_count); |
Martin Schwidefsky | 1b948d6 | 2014-04-03 13:55:01 +0200 | [diff] [blame] | 100 | if (MACHINE_HAS_TLB_LC) |
| 101 | cpumask_clear_cpu(cpu, &prev->context.cpu_attach_mask); |
Martin Schwidefsky | 53e857f | 2012-09-10 13:00:09 +0200 | [diff] [blame] | 102 | } |
| 103 | |
| 104 | #define finish_arch_post_lock_switch finish_arch_post_lock_switch |
| 105 | static inline void finish_arch_post_lock_switch(void) |
| 106 | { |
| 107 | struct task_struct *tsk = current; |
| 108 | struct mm_struct *mm = tsk->mm; |
| 109 | |
Martin Schwidefsky | f8b1350 | 2014-06-02 14:53:57 +0200 | [diff] [blame] | 110 | load_kernel_asce(); |
| 111 | if (mm) { |
| 112 | preempt_disable(); |
| 113 | while (atomic_read(&mm->context.attach_count) >> 16) |
| 114 | cpu_relax(); |
Martin Schwidefsky | 53e857f | 2012-09-10 13:00:09 +0200 | [diff] [blame] | 115 | |
Martin Schwidefsky | f8b1350 | 2014-06-02 14:53:57 +0200 | [diff] [blame] | 116 | cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm)); |
| 117 | if (mm->context.flush_mm) |
| 118 | __tlb_flush_mm(mm); |
| 119 | preempt_enable(); |
| 120 | } |
| 121 | set_fs(current->thread.mm_segment); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | } |
| 123 | |
Martin Schwidefsky | 3610cce | 2007-10-22 12:52:47 +0200 | [diff] [blame] | 124 | #define enter_lazy_tlb(mm,tsk) do { } while (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | #define deactivate_mm(tsk,mm) do { } while (0) |
| 126 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 127 | static inline void activate_mm(struct mm_struct *prev, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | struct mm_struct *next) |
| 129 | { |
Martin Schwidefsky | beef560 | 2014-04-14 15:11:26 +0200 | [diff] [blame] | 130 | switch_mm(prev, next, current); |
| 131 | cpumask_set_cpu(smp_processor_id(), mm_cpumask(next)); |
| 132 | set_user_asce(next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | } |
| 134 | |
Martin Schwidefsky | 0f6f281 | 2012-07-26 08:53:06 +0200 | [diff] [blame] | 135 | static inline void arch_dup_mmap(struct mm_struct *oldmm, |
| 136 | struct mm_struct *mm) |
| 137 | { |
Martin Schwidefsky | 0f6f281 | 2012-07-26 08:53:06 +0200 | [diff] [blame] | 138 | } |
| 139 | |
| 140 | static inline void arch_exit_mmap(struct mm_struct *mm) |
| 141 | { |
| 142 | } |
| 143 | |
Dave Hansen | 62e88b1 | 2014-11-18 10:23:50 -0800 | [diff] [blame] | 144 | static inline void arch_unmap(struct mm_struct *mm, |
| 145 | struct vm_area_struct *vma, |
| 146 | unsigned long start, unsigned long end) |
| 147 | { |
| 148 | } |
| 149 | |
| 150 | static inline void arch_bprm_mm_init(struct mm_struct *mm, |
| 151 | struct vm_area_struct *vma) |
| 152 | { |
| 153 | } |
| 154 | |
Dave Hansen | 1b2ee12 | 2016-02-12 13:02:21 -0800 | [diff] [blame] | 155 | static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, |
Dave Hansen | d61172b | 2016-02-12 13:02:24 -0800 | [diff] [blame] | 156 | bool write, bool execute, bool foreign) |
Dave Hansen | 33a709b | 2016-02-12 13:02:19 -0800 | [diff] [blame] | 157 | { |
| 158 | /* by default, allow everything */ |
| 159 | return true; |
| 160 | } |
| 161 | |
| 162 | static inline bool arch_pte_access_permitted(pte_t pte, bool write) |
| 163 | { |
| 164 | /* by default, allow everything */ |
| 165 | return true; |
| 166 | } |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 167 | #endif /* __S390_MMU_CONTEXT_H */ |