Paul Mackerras | 047ea78 | 2005-11-19 20:17:32 +1100 | [diff] [blame] | 1 | #ifndef __ASM_POWERPC_MMU_CONTEXT_H |
| 2 | #define __ASM_POWERPC_MMU_CONTEXT_H |
Arnd Bergmann | 88ced03 | 2005-12-16 22:43:46 +0100 | [diff] [blame] | 3 | #ifdef __KERNEL__ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | |
Benjamin Herrenschmidt | 5e69661 | 2008-12-18 19:13:24 +0000 | [diff] [blame] | 5 | #include <linux/kernel.h> |
| 6 | #include <linux/mm.h> |
| 7 | #include <linux/sched.h> |
| 8 | #include <linux/spinlock.h> |
Kumar Gala | 80a7cc6 | 2007-07-03 03:22:05 -0500 | [diff] [blame] | 9 | #include <asm/mmu.h> |
| 10 | #include <asm/cputable.h> |
| 11 | #include <asm-generic/mm_hooks.h> |
Benjamin Herrenschmidt | 5e69661 | 2008-12-18 19:13:24 +0000 | [diff] [blame] | 12 | #include <asm/cputhreads.h> |
Kumar Gala | 80a7cc6 | 2007-07-03 03:22:05 -0500 | [diff] [blame] | 13 | |
| 14 | /* |
Benjamin Herrenschmidt | 5e69661 | 2008-12-18 19:13:24 +0000 | [diff] [blame] | 15 | * Most if the context management is out of line |
Kumar Gala | 80a7cc6 | 2007-07-03 03:22:05 -0500 | [diff] [blame] | 16 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm); |
| 18 | extern void destroy_context(struct mm_struct *mm); |
| 19 | |
Benjamin Herrenschmidt | 5e69661 | 2008-12-18 19:13:24 +0000 | [diff] [blame] | 20 | extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm); |
Benjamin Herrenschmidt | 5e69661 | 2008-12-18 19:13:24 +0000 | [diff] [blame] | 22 | extern void set_context(unsigned long id, pgd_t *pgd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
Benjamin Herrenschmidt | 6f0ef0f | 2009-07-23 23:15:26 +0000 | [diff] [blame] | 24 | #ifdef CONFIG_PPC_BOOK3S_64 |
Alexander Graf | e85a471 | 2009-11-02 12:02:30 +0000 | [diff] [blame] | 25 | extern int __init_new_context(void); |
| 26 | extern void __destroy_context(int context_id); |
Benjamin Herrenschmidt | 6f0ef0f | 2009-07-23 23:15:26 +0000 | [diff] [blame] | 27 | static inline void mmu_context_init(void) { } |
| 28 | #else |
Alexander Graf | c83ec26 | 2010-04-16 00:11:36 +0200 | [diff] [blame] | 29 | extern unsigned long __init_new_context(void); |
| 30 | extern void __destroy_context(unsigned long context_id); |
Benjamin Herrenschmidt | 6f0ef0f | 2009-07-23 23:15:26 +0000 | [diff] [blame] | 31 | extern void mmu_context_init(void); |
| 32 | #endif |
| 33 | |
Tseng-Hui (Frank) Lin | 851d2e2 | 2011-05-02 20:43:04 +0000 | [diff] [blame] | 34 | extern void switch_cop(struct mm_struct *next); |
| 35 | extern int use_cop(unsigned long acop, struct mm_struct *mm); |
| 36 | extern void drop_cop(unsigned long acop, struct mm_struct *mm); |
| 37 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | /* |
| 39 | * switch_mm is the entry point called from the architecture independent |
Viresh Kumar | 0a0fca9 | 2013-06-04 13:10:24 +0530 | [diff] [blame] | 40 | * code in kernel/sched/core.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | */ |
| 42 | static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, |
| 43 | struct task_struct *tsk) |
| 44 | { |
Benjamin Herrenschmidt | 5e69661 | 2008-12-18 19:13:24 +0000 | [diff] [blame] | 45 | /* Mark this context has been used on the new CPU */ |
Rusty Russell | 56aa412 | 2009-03-15 18:16:43 +0000 | [diff] [blame] | 46 | cpumask_set_cpu(smp_processor_id(), mm_cpumask(next)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
Benjamin Herrenschmidt | 5e69661 | 2008-12-18 19:13:24 +0000 | [diff] [blame] | 48 | /* 32-bit keeps track of the current PGDIR in the thread struct */ |
| 49 | #ifdef CONFIG_PPC32 |
| 50 | tsk->thread.pgdir = next->pgd; |
| 51 | #endif /* CONFIG_PPC32 */ |
| 52 | |
Benjamin Herrenschmidt | 25d21ad | 2009-07-23 23:15:47 +0000 | [diff] [blame] | 53 | /* 64-bit Book3E keeps track of current PGD in the PACA */ |
| 54 | #ifdef CONFIG_PPC_BOOK3E_64 |
| 55 | get_paca()->pgd = next->pgd; |
| 56 | #endif |
Benjamin Herrenschmidt | 5e69661 | 2008-12-18 19:13:24 +0000 | [diff] [blame] | 57 | /* Nothing else to do if we aren't actually switching */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | if (prev == next) |
| 59 | return; |
| 60 | |
Tseng-Hui (Frank) Lin | 851d2e2 | 2011-05-02 20:43:04 +0000 | [diff] [blame] | 61 | #ifdef CONFIG_PPC_ICSWX |
| 62 | /* Switch coprocessor context only if prev or next uses a coprocessor */ |
| 63 | if (prev->context.acop || next->context.acop) |
| 64 | switch_cop(next); |
| 65 | #endif /* CONFIG_PPC_ICSWX */ |
| 66 | |
Benjamin Herrenschmidt | 5e69661 | 2008-12-18 19:13:24 +0000 | [diff] [blame] | 67 | /* We must stop all altivec streams before changing the HW |
| 68 | * context |
| 69 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | #ifdef CONFIG_ALTIVEC |
| 71 | if (cpu_has_feature(CPU_FTR_ALTIVEC)) |
| 72 | asm volatile ("dssall"); |
| 73 | #endif /* CONFIG_ALTIVEC */ |
| 74 | |
Benjamin Herrenschmidt | 5e69661 | 2008-12-18 19:13:24 +0000 | [diff] [blame] | 75 | /* The actual HW switching method differs between the various |
| 76 | * sub architectures. |
| 77 | */ |
| 78 | #ifdef CONFIG_PPC_STD_MMU_64 |
Michael Ellerman | 13b3d13 | 2014-07-10 12:29:20 +1000 | [diff] [blame] | 79 | switch_slb(tsk, next); |
Benjamin Herrenschmidt | 5e69661 | 2008-12-18 19:13:24 +0000 | [diff] [blame] | 80 | #else |
| 81 | /* Out of line for now */ |
| 82 | switch_mmu_context(prev, next); |
| 83 | #endif |
| 84 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | } |
| 86 | |
| 87 | #define deactivate_mm(tsk,mm) do { } while (0) |
| 88 | |
| 89 | /* |
| 90 | * After we have set current->mm to a new value, this activates |
| 91 | * the context for the new mm so we see the new mappings. |
| 92 | */ |
| 93 | static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next) |
| 94 | { |
| 95 | unsigned long flags; |
| 96 | |
| 97 | local_irq_save(flags); |
| 98 | switch_mm(prev, next, current); |
| 99 | local_irq_restore(flags); |
| 100 | } |
| 101 | |
Benjamin Herrenschmidt | 5e69661 | 2008-12-18 19:13:24 +0000 | [diff] [blame] | 102 | /* We don't currently use enter_lazy_tlb() for anything */ |
| 103 | static inline void enter_lazy_tlb(struct mm_struct *mm, |
| 104 | struct task_struct *tsk) |
| 105 | { |
Benjamin Herrenschmidt | 25d21ad | 2009-07-23 23:15:47 +0000 | [diff] [blame] | 106 | /* 64-bit Book3E keeps track of current PGD in the PACA */ |
| 107 | #ifdef CONFIG_PPC_BOOK3E_64 |
| 108 | get_paca()->pgd = NULL; |
| 109 | #endif |
Benjamin Herrenschmidt | 5e69661 | 2008-12-18 19:13:24 +0000 | [diff] [blame] | 110 | } |
| 111 | |
Arnd Bergmann | 88ced03 | 2005-12-16 22:43:46 +0100 | [diff] [blame] | 112 | #endif /* __KERNEL__ */ |
Paul Mackerras | 047ea78 | 2005-11-19 20:17:32 +1100 | [diff] [blame] | 113 | #endif /* __ASM_POWERPC_MMU_CONTEXT_H */ |