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 <asm/spitfire.h>
10 #include <asm-generic/mm_hooks.h>
12 static inline void enter_lazy_tlb(struct mm_struct
*mm
, struct task_struct
*tsk
)
16 extern spinlock_t ctx_alloc_lock
;
17 extern unsigned long tlb_context_cache
;
18 extern unsigned long mmu_context_bmap
[];
20 void get_new_mmu_context(struct mm_struct
*mm
);
22 void smp_new_mmu_context_version(void);
24 #define smp_new_mmu_context_version() do { } while (0)
27 int init_new_context(struct task_struct
*tsk
, struct mm_struct
*mm
);
28 void destroy_context(struct mm_struct
*mm
);
30 void __tsb_context_switch(unsigned long pgd_pa
,
31 struct tsb_config
*tsb_base
,
32 struct tsb_config
*tsb_huge
,
33 unsigned long tsb_descr_pa
);
35 static inline void tsb_context_switch(struct mm_struct
*mm
)
37 __tsb_context_switch(__pa(mm
->pgd
),
38 &mm
->context
.tsb_block
[0],
39 #if defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE)
40 (mm
->context
.tsb_block
[1].tsb
?
41 &mm
->context
.tsb_block
[1] :
46 , __pa(&mm
->context
.tsb_descr
[0]));
49 void tsb_grow(struct mm_struct
*mm
,
50 unsigned long tsb_index
,
51 unsigned long mm_rss
);
53 void smp_tsb_sync(struct mm_struct
*mm
);
55 #define smp_tsb_sync(__mm) do { } while (0)
58 /* Set MMU context in the actual hardware. */
59 #define load_secondary_context(__mm) \
60 __asm__ __volatile__( \
61 "\n661: stxa %0, [%1] %2\n" \
62 " .section .sun4v_1insn_patch, \"ax\"\n" \
64 " stxa %0, [%1] %3\n" \
68 : "r" (CTX_HWBITS((__mm)->context)), \
69 "r" (SECONDARY_CONTEXT), "i" (ASI_DMMU), "i" (ASI_MMU))
71 void __flush_tlb_mm(unsigned long, unsigned long);
73 /* Switch the current MM context. */
74 static inline void switch_mm(struct mm_struct
*old_mm
, struct mm_struct
*mm
, struct task_struct
*tsk
)
76 unsigned long ctx_valid
, flags
;
79 if (unlikely(mm
== &init_mm
))
82 spin_lock_irqsave(&mm
->context
.lock
, flags
);
83 ctx_valid
= CTX_VALID(mm
->context
);
85 get_new_mmu_context(mm
);
87 /* We have to be extremely careful here or else we will miss
88 * a TSB grow if we switch back and forth between a kernel
89 * thread and an address space which has it's TSB size increased
90 * on another processor.
92 * It is possible to play some games in order to optimize the
93 * switch, but the safest thing to do is to unconditionally
94 * perform the secondary context load and the TSB context switch.
96 * For reference the bad case is, for address space "A":
100 * set cpu0's bits in cpu_vm_mask
101 * switch to kernel thread, borrow
102 * address space A via entry_lazy_tlb
103 * run address space A
104 * set cpu1's bit in cpu_vm_mask
105 * flush_tlb_pending()
106 * reset cpu_vm_mask to just cpu1
108 * run address space A
109 * context was valid, so skip
112 * At that point cpu0 continues to use a stale TSB, the one from
113 * before the TSB grow performed on cpu1. cpu1 did not cross-call
114 * cpu0 to update it's TSB because at that point the cpu_vm_mask
115 * only had cpu1 set in it.
117 load_secondary_context(mm
);
118 tsb_context_switch(mm
);
120 /* Any time a processor runs a context on an address space
121 * for the first time, we must flush that context out of the
124 cpu
= smp_processor_id();
125 if (!ctx_valid
|| !cpumask_test_cpu(cpu
, mm_cpumask(mm
))) {
126 cpumask_set_cpu(cpu
, mm_cpumask(mm
));
127 __flush_tlb_mm(CTX_HWBITS(mm
->context
),
130 spin_unlock_irqrestore(&mm
->context
.lock
, flags
);
133 #define deactivate_mm(tsk,mm) do { } while (0)
135 /* Activate a new MM instance for the current task. */
136 static inline void activate_mm(struct mm_struct
*active_mm
, struct mm_struct
*mm
)
141 spin_lock_irqsave(&mm
->context
.lock
, flags
);
142 if (!CTX_VALID(mm
->context
))
143 get_new_mmu_context(mm
);
144 cpu
= smp_processor_id();
145 if (!cpumask_test_cpu(cpu
, mm_cpumask(mm
)))
146 cpumask_set_cpu(cpu
, mm_cpumask(mm
));
148 load_secondary_context(mm
);
149 __flush_tlb_mm(CTX_HWBITS(mm
->context
), SECONDARY_CONTEXT
);
150 tsb_context_switch(mm
);
151 spin_unlock_irqrestore(&mm
->context
.lock
, flags
);
154 #endif /* !(__ASSEMBLY__) */
156 #endif /* !(__SPARC64_MMU_CONTEXT_H) */