1 #ifndef __SPARC64_MMU_CONTEXT_H
2 #define __SPARC64_MMU_CONTEXT_H
4 /* Derived heavily from Linus's Alpha/AXP ASN code... */
8 #include <linux/spinlock.h>
9 #include <linux/mm_types.h>
11 #include <asm/spitfire.h>
12 #include <asm-generic/mm_hooks.h>
14 static inline void enter_lazy_tlb(struct mm_struct
*mm
, struct task_struct
*tsk
)
18 extern spinlock_t ctx_alloc_lock
;
19 extern unsigned long tlb_context_cache
;
20 extern unsigned long mmu_context_bmap
[];
22 void get_new_mmu_context(struct mm_struct
*mm
);
24 void smp_new_mmu_context_version(void);
26 #define smp_new_mmu_context_version() do { } while (0)
29 int init_new_context(struct task_struct
*tsk
, struct mm_struct
*mm
);
30 void destroy_context(struct mm_struct
*mm
);
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
);
37 static inline void tsb_context_switch(struct mm_struct
*mm
)
39 __tsb_context_switch(__pa(mm
->pgd
),
40 &mm
->context
.tsb_block
[MM_TSB_BASE
],
41 #if defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE)
42 (mm
->context
.tsb_block
[MM_TSB_HUGE
].tsb
?
43 &mm
->context
.tsb_block
[MM_TSB_HUGE
] :
48 , __pa(&mm
->context
.tsb_descr
[MM_TSB_BASE
]));
51 void tsb_grow(struct mm_struct
*mm
,
52 unsigned long tsb_index
,
53 unsigned long mm_rss
);
55 void smp_tsb_sync(struct mm_struct
*mm
);
57 #define smp_tsb_sync(__mm) do { } while (0)
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" \
66 " stxa %0, [%1] %3\n" \
70 : "r" (CTX_HWBITS((__mm)->context)), \
71 "r" (SECONDARY_CONTEXT), "i" (ASI_DMMU), "i" (ASI_MMU))
73 void __flush_tlb_mm(unsigned long, unsigned long);
75 /* Switch the current MM context. */
76 static inline void switch_mm(struct mm_struct
*old_mm
, struct mm_struct
*mm
, struct task_struct
*tsk
)
78 unsigned long ctx_valid
, flags
;
81 if (unlikely(mm
== &init_mm
))
84 spin_lock_irqsave(&mm
->context
.lock
, flags
);
85 ctx_valid
= CTX_VALID(mm
->context
);
87 get_new_mmu_context(mm
);
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.
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.
98 * For reference the bad case is, for address space "A":
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
110 * run address space A
111 * context was valid, so skip
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.
119 load_secondary_context(mm
);
120 tsb_context_switch(mm
);
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
126 cpu
= smp_processor_id();
127 if (!ctx_valid
|| !cpumask_test_cpu(cpu
, mm_cpumask(mm
))) {
128 cpumask_set_cpu(cpu
, mm_cpumask(mm
));
129 __flush_tlb_mm(CTX_HWBITS(mm
->context
),
132 spin_unlock_irqrestore(&mm
->context
.lock
, flags
);
135 #define deactivate_mm(tsk,mm) do { } while (0)
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
)
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();
147 if (!cpumask_test_cpu(cpu
, mm_cpumask(mm
)))
148 cpumask_set_cpu(cpu
, mm_cpumask(mm
));
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
);
156 #endif /* !(__ASSEMBLY__) */
158 #endif /* !(__SPARC64_MMU_CONTEXT_H) */