1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 2c6557e7fSMartin Schwidefsky /* 3c6557e7fSMartin Schwidefsky * S390 version 4c6557e7fSMartin Schwidefsky * 5c6557e7fSMartin Schwidefsky * Derived from "include/asm-i386/mmu_context.h" 6c6557e7fSMartin Schwidefsky */ 7c6557e7fSMartin Schwidefsky 8c6557e7fSMartin Schwidefsky #ifndef __S390_MMU_CONTEXT_H 9c6557e7fSMartin Schwidefsky #define __S390_MMU_CONTEXT_H 10c6557e7fSMartin Schwidefsky 11c6557e7fSMartin Schwidefsky #include <asm/pgalloc.h> 127c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 13589ee628SIngo Molnar #include <linux/mm_types.h> 14050eef36SMartin Schwidefsky #include <asm/tlbflush.h> 15a0616cdeSDavid Howells #include <asm/ctl_reg.h> 168e58ab5cSMartin Schwidefsky #include <asm-generic/mm_hooks.h> 17c6557e7fSMartin Schwidefsky 18c6557e7fSMartin Schwidefsky static inline int init_new_context(struct task_struct *tsk, 19c6557e7fSMartin Schwidefsky struct mm_struct *mm) 20c6557e7fSMartin Schwidefsky { 211058c163SAlexander Gordeev unsigned long asce_type, init_entry; 221058c163SAlexander Gordeev 2360f07c8eSMartin Schwidefsky spin_lock_init(&mm->context.lock); 243446c13bSMartin Schwidefsky INIT_LIST_HEAD(&mm->context.pgtable_list); 253446c13bSMartin Schwidefsky INIT_LIST_HEAD(&mm->context.gmap_list); 261b948d6cSMartin Schwidefsky cpumask_clear(&mm->context.cpu_attach_mask); 2764f31d58SMartin Schwidefsky atomic_set(&mm->context.flush_count, 0); 28214d9bbcSClaudio Imbrenda atomic_set(&mm->context.is_protected, 0); 2944b6cc81SMartin Schwidefsky mm->context.gmap_asce = 0; 30050eef36SMartin Schwidefsky mm->context.flush_mm = 0; 310b46e0a3SMartin Schwidefsky #ifdef CONFIG_PGSTE 3223fefe11SMartin Schwidefsky mm->context.alloc_pgste = page_table_allocate_pgste || 3323fefe11SMartin Schwidefsky test_thread_flag(TIF_PGSTE) || 3453c4ab70SMartin Schwidefsky (current->mm && current->mm->context.alloc_pgste); 35250cf776SChristian Borntraeger mm->context.has_pgste = 0; 3655531b74SJanosch Frank mm->context.uses_skeys = 0; 37c9f0a2b8SJanosch Frank mm->context.uses_cmm = 0; 38a9e00d83SJanosch Frank mm->context.allow_gmap_hpage_1m = 0; 390b46e0a3SMartin Schwidefsky #endif 40723cacbdSGerald Schaefer switch (mm->context.asce_limit) { 411058c163SAlexander Gordeev default: 42723cacbdSGerald Schaefer /* 431058c163SAlexander Gordeev * context created by exec, the value of asce_limit can 441058c163SAlexander Gordeev * only be zero in this case 45723cacbdSGerald Schaefer */ 461058c163SAlexander Gordeev VM_BUG_ON(mm->context.asce_limit); 471058c163SAlexander Gordeev /* continue as 3-level task */ 48f7555608SAlexander Gordeev mm->context.asce_limit = _REGION2_SIZE; 491058c163SAlexander Gordeev fallthrough; 501058c163SAlexander Gordeev case _REGION2_SIZE: 511058c163SAlexander Gordeev /* forked 3-level task */ 521058c163SAlexander Gordeev init_entry = _REGION3_ENTRY_EMPTY; 531058c163SAlexander Gordeev asce_type = _ASCE_TYPE_REGION3; 54723cacbdSGerald Schaefer break; 55f7555608SAlexander Gordeev case TASK_SIZE_MAX: 561058c163SAlexander Gordeev /* forked 5-level task */ 571058c163SAlexander Gordeev init_entry = _REGION1_ENTRY_EMPTY; 581058c163SAlexander Gordeev asce_type = _ASCE_TYPE_REGION1; 590b89ede6SMartin Schwidefsky break; 60f1c1174fSHeiko Carstens case _REGION1_SIZE: 611058c163SAlexander Gordeev /* forked 4-level task */ 621058c163SAlexander Gordeev init_entry = _REGION2_ENTRY_EMPTY; 631058c163SAlexander Gordeev asce_type = _ASCE_TYPE_REGION2; 64723cacbdSGerald Schaefer break; 653446c13bSMartin Schwidefsky } 661058c163SAlexander Gordeev mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH | 671058c163SAlexander Gordeev _ASCE_USER_BITS | asce_type; 681058c163SAlexander Gordeev crst_table_init((unsigned long *) mm->pgd, init_entry); 69c6557e7fSMartin Schwidefsky return 0; 70c6557e7fSMartin Schwidefsky } 71c6557e7fSMartin Schwidefsky 72c6557e7fSMartin Schwidefsky #define destroy_context(mm) do { } while (0) 73c6557e7fSMartin Schwidefsky 74c6557e7fSMartin Schwidefsky static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 75c6557e7fSMartin Schwidefsky struct task_struct *tsk) 76c6557e7fSMartin Schwidefsky { 7753e857f3SMartin Schwidefsky int cpu = smp_processor_id(); 7853e857f3SMartin Schwidefsky 79*b4d70a61SHeiko Carstens if (next == &init_mm) 80*b4d70a61SHeiko Carstens S390_lowcore.user_asce = s390_invalid_asce; 81*b4d70a61SHeiko Carstens else 820aaba41bSMartin Schwidefsky S390_lowcore.user_asce = next->context.asce; 831b948d6cSMartin Schwidefsky cpumask_set_cpu(cpu, &next->context.cpu_attach_mask); 8487d59863SHeiko Carstens /* Clear previous user-ASCE from CR7 */ 850290c9e3SHeiko Carstens __ctl_load(s390_invalid_asce, 7, 7); 86a3866208SMartin Schwidefsky if (prev != next) 871b948d6cSMartin Schwidefsky cpumask_clear_cpu(cpu, &prev->context.cpu_attach_mask); 8853e857f3SMartin Schwidefsky } 8953e857f3SMartin Schwidefsky 9053e857f3SMartin Schwidefsky #define finish_arch_post_lock_switch finish_arch_post_lock_switch 9153e857f3SMartin Schwidefsky static inline void finish_arch_post_lock_switch(void) 9253e857f3SMartin Schwidefsky { 9353e857f3SMartin Schwidefsky struct task_struct *tsk = current; 9453e857f3SMartin Schwidefsky struct mm_struct *mm = tsk->mm; 9553e857f3SMartin Schwidefsky 96f8b13505SMartin Schwidefsky if (mm) { 9753e857f3SMartin Schwidefsky preempt_disable(); 9864f31d58SMartin Schwidefsky while (atomic_read(&mm->context.flush_count)) 9953e857f3SMartin Schwidefsky cpu_relax(); 100b3e5dc45SMartin Schwidefsky cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm)); 10160f07c8eSMartin Schwidefsky __tlb_flush_mm_lazy(mm); 10253e857f3SMartin Schwidefsky preempt_enable(); 103c6557e7fSMartin Schwidefsky } 10487d59863SHeiko Carstens __ctl_load(S390_lowcore.user_asce, 7, 7); 105f8b13505SMartin Schwidefsky } 106c6557e7fSMartin Schwidefsky 107c6557e7fSMartin Schwidefsky #define enter_lazy_tlb(mm,tsk) do { } while (0) 108c6557e7fSMartin Schwidefsky #define deactivate_mm(tsk,mm) do { } while (0) 109c6557e7fSMartin Schwidefsky 110c6557e7fSMartin Schwidefsky static inline void activate_mm(struct mm_struct *prev, 111c6557e7fSMartin Schwidefsky struct mm_struct *next) 112c6557e7fSMartin Schwidefsky { 113c6557e7fSMartin Schwidefsky switch_mm(prev, next, current); 114b3e5dc45SMartin Schwidefsky cpumask_set_cpu(smp_processor_id(), mm_cpumask(next)); 11587d59863SHeiko Carstens __ctl_load(S390_lowcore.user_asce, 7, 7); 116c6557e7fSMartin Schwidefsky } 117c6557e7fSMartin Schwidefsky 118c6557e7fSMartin Schwidefsky #endif /* __S390_MMU_CONTEXT_H */ 119