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f5e706ad SR |
1 | #ifndef __SPARC64_MMU_CONTEXT_H |
2 | #define __SPARC64_MMU_CONTEXT_H | |
3 | ||
4 | /* Derived heavily from Linus's Alpha/AXP ASN code... */ | |
5 | ||
6 | #ifndef __ASSEMBLY__ | |
7 | ||
8 | #include <linux/spinlock.h> | |
589ee628 IM |
9 | #include <linux/mm_types.h> |
10 | ||
f5e706ad SR |
11 | #include <asm/spitfire.h> |
12 | #include <asm-generic/mm_hooks.h> | |
13 | ||
14 | static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) | |
15 | { | |
16 | } | |
17 | ||
18 | extern spinlock_t ctx_alloc_lock; | |
19 | extern unsigned long tlb_context_cache; | |
20 | extern unsigned long mmu_context_bmap[]; | |
21 | ||
f05a6865 | 22 | void get_new_mmu_context(struct mm_struct *mm); |
f5e706ad | 23 | #ifdef CONFIG_SMP |
f05a6865 | 24 | void smp_new_mmu_context_version(void); |
f5e706ad SR |
25 | #else |
26 | #define smp_new_mmu_context_version() do { } while (0) | |
27 | #endif | |
28 | ||
f05a6865 SR |
29 | int init_new_context(struct task_struct *tsk, struct mm_struct *mm); |
30 | void destroy_context(struct mm_struct *mm); | |
f5e706ad | 31 | |
f05a6865 SR |
32 | void __tsb_context_switch(unsigned long pgd_pa, |
33 | struct tsb_config *tsb_base, | |
34 | struct tsb_config *tsb_huge, | |
35 | unsigned long tsb_descr_pa); | |
f5e706ad SR |
36 | |
37 | static inline void tsb_context_switch(struct mm_struct *mm) | |
38 | { | |
39 | __tsb_context_switch(__pa(mm->pgd), | |
4bbc84ff | 40 | &mm->context.tsb_block[MM_TSB_BASE], |
9e695d2e | 41 | #if defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE) |
4bbc84ff MK |
42 | (mm->context.tsb_block[MM_TSB_HUGE].tsb ? |
43 | &mm->context.tsb_block[MM_TSB_HUGE] : | |
f5e706ad SR |
44 | NULL) |
45 | #else | |
46 | NULL | |
47 | #endif | |
4bbc84ff | 48 | , __pa(&mm->context.tsb_descr[MM_TSB_BASE])); |
f5e706ad SR |
49 | } |
50 | ||
f05a6865 SR |
51 | void tsb_grow(struct mm_struct *mm, |
52 | unsigned long tsb_index, | |
53 | unsigned long mm_rss); | |
f5e706ad | 54 | #ifdef CONFIG_SMP |
f05a6865 | 55 | void smp_tsb_sync(struct mm_struct *mm); |
f5e706ad SR |
56 | #else |
57 | #define smp_tsb_sync(__mm) do { } while (0) | |
58 | #endif | |
59 | ||
60 | /* Set MMU context in the actual hardware. */ | |
61 | #define load_secondary_context(__mm) \ | |
62 | __asm__ __volatile__( \ | |
63 | "\n661: stxa %0, [%1] %2\n" \ | |
64 | " .section .sun4v_1insn_patch, \"ax\"\n" \ | |
65 | " .word 661b\n" \ | |
66 | " stxa %0, [%1] %3\n" \ | |
67 | " .previous\n" \ | |
68 | " flush %%g6\n" \ | |
69 | : /* No outputs */ \ | |
70 | : "r" (CTX_HWBITS((__mm)->context)), \ | |
71 | "r" (SECONDARY_CONTEXT), "i" (ASI_DMMU), "i" (ASI_MMU)) | |
72 | ||
f05a6865 | 73 | void __flush_tlb_mm(unsigned long, unsigned long); |
f5e706ad | 74 | |
07df8418 | 75 | /* Switch the current MM context. */ |
f5e706ad SR |
76 | static inline void switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, struct task_struct *tsk) |
77 | { | |
78 | unsigned long ctx_valid, flags; | |
79 | int cpu; | |
80 | ||
81 | if (unlikely(mm == &init_mm)) | |
82 | return; | |
83 | ||
84 | spin_lock_irqsave(&mm->context.lock, flags); | |
85 | ctx_valid = CTX_VALID(mm->context); | |
86 | if (!ctx_valid) | |
87 | get_new_mmu_context(mm); | |
88 | ||
89 | /* We have to be extremely careful here or else we will miss | |
90 | * a TSB grow if we switch back and forth between a kernel | |
91 | * thread and an address space which has it's TSB size increased | |
92 | * on another processor. | |
93 | * | |
94 | * It is possible to play some games in order to optimize the | |
95 | * switch, but the safest thing to do is to unconditionally | |
96 | * perform the secondary context load and the TSB context switch. | |
97 | * | |
98 | * For reference the bad case is, for address space "A": | |
99 | * | |
100 | * CPU 0 CPU 1 | |
101 | * run address space A | |
102 | * set cpu0's bits in cpu_vm_mask | |
103 | * switch to kernel thread, borrow | |
104 | * address space A via entry_lazy_tlb | |
105 | * run address space A | |
106 | * set cpu1's bit in cpu_vm_mask | |
107 | * flush_tlb_pending() | |
108 | * reset cpu_vm_mask to just cpu1 | |
109 | * TSB grow | |
110 | * run address space A | |
111 | * context was valid, so skip | |
112 | * TSB context switch | |
113 | * | |
114 | * At that point cpu0 continues to use a stale TSB, the one from | |
115 | * before the TSB grow performed on cpu1. cpu1 did not cross-call | |
116 | * cpu0 to update it's TSB because at that point the cpu_vm_mask | |
117 | * only had cpu1 set in it. | |
118 | */ | |
119 | load_secondary_context(mm); | |
120 | tsb_context_switch(mm); | |
121 | ||
122 | /* Any time a processor runs a context on an address space | |
123 | * for the first time, we must flush that context out of the | |
124 | * local TLB. | |
125 | */ | |
126 | cpu = smp_processor_id(); | |
81f1adf0 RR |
127 | if (!ctx_valid || !cpumask_test_cpu(cpu, mm_cpumask(mm))) { |
128 | cpumask_set_cpu(cpu, mm_cpumask(mm)); | |
f5e706ad SR |
129 | __flush_tlb_mm(CTX_HWBITS(mm->context), |
130 | SECONDARY_CONTEXT); | |
131 | } | |
132 | spin_unlock_irqrestore(&mm->context.lock, flags); | |
133 | } | |
134 | ||
135 | #define deactivate_mm(tsk,mm) do { } while (0) | |
136 | ||
137 | /* Activate a new MM instance for the current task. */ | |
138 | static inline void activate_mm(struct mm_struct *active_mm, struct mm_struct *mm) | |
139 | { | |
140 | unsigned long flags; | |
141 | int cpu; | |
142 | ||
143 | spin_lock_irqsave(&mm->context.lock, flags); | |
144 | if (!CTX_VALID(mm->context)) | |
145 | get_new_mmu_context(mm); | |
146 | cpu = smp_processor_id(); | |
81f1adf0 RR |
147 | if (!cpumask_test_cpu(cpu, mm_cpumask(mm))) |
148 | cpumask_set_cpu(cpu, mm_cpumask(mm)); | |
f5e706ad SR |
149 | |
150 | load_secondary_context(mm); | |
151 | __flush_tlb_mm(CTX_HWBITS(mm->context), SECONDARY_CONTEXT); | |
152 | tsb_context_switch(mm); | |
153 | spin_unlock_irqrestore(&mm->context.lock, flags); | |
154 | } | |
155 | ||
156 | #endif /* !(__ASSEMBLY__) */ | |
157 | ||
158 | #endif /* !(__SPARC64_MMU_CONTEXT_H) */ |