summaryrefslogtreecommitdiff
path: root/arch/powerpc/include/asm/mmu_context.h
blob: fd277b15635c06c4e3bfe60a6103201ea5148a0f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_POWERPC_MMU_CONTEXT_H
#define __ASM_POWERPC_MMU_CONTEXT_H
#ifdef __KERNEL__

#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <asm/mmu.h>	
#include <asm/cputable.h>
#include <asm/cputhreads.h>

/*
 * Most if the context management is out of line
 */
#define init_new_context init_new_context
extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
#define destroy_context destroy_context
extern void destroy_context(struct mm_struct *mm);
#ifdef CONFIG_SPAPR_TCE_IOMMU
struct mm_iommu_table_group_mem_t;

extern int isolate_lru_page(struct page *page);	/* from internal.h */
extern bool mm_iommu_preregistered(struct mm_struct *mm);
extern long mm_iommu_new(struct mm_struct *mm,
		unsigned long ua, unsigned long entries,
		struct mm_iommu_table_group_mem_t **pmem);
extern long mm_iommu_newdev(struct mm_struct *mm, unsigned long ua,
		unsigned long entries, unsigned long dev_hpa,
		struct mm_iommu_table_group_mem_t **pmem);
extern long mm_iommu_put(struct mm_struct *mm,
		struct mm_iommu_table_group_mem_t *mem);
extern void mm_iommu_init(struct mm_struct *mm);
extern void mm_iommu_cleanup(struct mm_struct *mm);
extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup(struct mm_struct *mm,
		unsigned long ua, unsigned long size);
extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup_rm(
		struct mm_struct *mm, unsigned long ua, unsigned long size);
extern struct mm_iommu_table_group_mem_t *mm_iommu_get(struct mm_struct *mm,
		unsigned long ua, unsigned long entries);
extern long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem,
		unsigned long ua, unsigned int pageshift, unsigned long *hpa);
extern long mm_iommu_ua_to_hpa_rm(struct mm_iommu_table_group_mem_t *mem,
		unsigned long ua, unsigned int pageshift, unsigned long *hpa);
extern void mm_iommu_ua_mark_dirty_rm(struct mm_struct *mm, unsigned long ua);
extern bool mm_iommu_is_devmem(struct mm_struct *mm, unsigned long hpa,
		unsigned int pageshift, unsigned long *size);
extern long mm_iommu_mapped_inc(struct mm_iommu_table_group_mem_t *mem);
extern void mm_iommu_mapped_dec(struct mm_iommu_table_group_mem_t *mem);
#else
static inline bool mm_iommu_is_devmem(struct mm_struct *mm, unsigned long hpa,
		unsigned int pageshift, unsigned long *size)
{
	return false;
}
static inline void mm_iommu_init(struct mm_struct *mm) { }
#endif
extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);

#ifdef CONFIG_PPC_BOOK3S_64
extern void radix__switch_mmu_context(struct mm_struct *prev,
				      struct mm_struct *next);
static inline void switch_mmu_context(struct mm_struct *prev,
				      struct mm_struct *next,
				      struct task_struct *tsk)
{
	if (radix_enabled())
		return radix__switch_mmu_context(prev, next);
	return switch_slb(tsk, next);
}

extern int hash__alloc_context_id(void);
void __init hash__reserve_context_id(int id);
extern void __destroy_context(int context_id);
static inline void mmu_context_init(void) { }

#ifdef CONFIG_PPC_64S_HASH_MMU
static inline int alloc_extended_context(struct mm_struct *mm,
					 unsigned long ea)
{
	int context_id;

	int index = ea >> MAX_EA_BITS_PER_CONTEXT;

	context_id = hash__alloc_context_id();
	if (context_id < 0)
		return context_id;

	VM_WARN_ON(mm->context.extended_id[index]);
	mm->context.extended_id[index] = context_id;
	return context_id;
}

static inline bool need_extra_context(struct mm_struct *mm, unsigned long ea)
{
	int context_id;

	context_id = get_user_context(&mm->context, ea);
	if (!context_id)
		return true;
	return false;
}
#endif

#else
extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next,
			       struct task_struct *tsk);
extern unsigned long __init_new_context(void);
extern void __destroy_context(unsigned long context_id);
extern void mmu_context_init(void);
static inline int alloc_extended_context(struct mm_struct *mm,
					 unsigned long ea)
{
	/* non book3s_64 should never find this called */
	WARN_ON(1);
	return -ENOMEM;
}

static inline bool need_extra_context(struct mm_struct *mm, unsigned long ea)
{
	return false;
}
#endif

extern void switch_cop(struct mm_struct *next);
extern int use_cop(unsigned long acop, struct mm_struct *mm);
extern void drop_cop(unsigned long acop, struct mm_struct *mm);

#ifdef CONFIG_PPC_BOOK3S_64
static inline void inc_mm_active_cpus(struct mm_struct *mm)
{
	atomic_inc(&mm->context.active_cpus);
}

static inline void dec_mm_active_cpus(struct mm_struct *mm)
{
	atomic_dec(&mm->context.active_cpus);
}

static inline void mm_context_add_copro(struct mm_struct *mm)
{
	/*
	 * If any copro is in use, increment the active CPU count
	 * in order to force TLB invalidations to be global as to
	 * propagate to the Nest MMU.
	 */
	if (atomic_inc_return(&mm->context.copros) == 1)
		inc_mm_active_cpus(mm);
}

static inline void mm_context_remove_copro(struct mm_struct *mm)
{
	int c;

	/*
	 * When removing the last copro, we need to broadcast a global
	 * flush of the full mm, as the next TLBI may be local and the
	 * nMMU and/or PSL need to be cleaned up.
	 *
	 * Both the 'copros' and 'active_cpus' counts are looked at in
	 * flush_all_mm() to determine the scope (local/global) of the
	 * TLBIs, so we need to flush first before decrementing
	 * 'copros'. If this API is used by several callers for the
	 * same context, it can lead to over-flushing. It's hopefully
	 * not common enough to be a problem.
	 *
	 * Skip on hash, as we don't know how to do the proper flush
	 * for the time being. Invalidations will remain global if
	 * used on hash. Note that we can't drop 'copros' either, as
	 * it could make some invalidations local with no flush
	 * in-between.
	 */
	if (radix_enabled()) {
		flush_all_mm(mm);

		c = atomic_dec_if_positive(&mm->context.copros);
		/* Detect imbalance between add and remove */
		WARN_ON(c < 0);

		if (c == 0)
			dec_mm_active_cpus(mm);
	}
}

/*
 * vas_windows counter shows number of open windows in the mm
 * context. During context switch, use this counter to clear the
 * foreign real address mapping (CP_ABORT) for the thread / process
 * that intend to use COPY/PASTE. When a process closes all windows,
 * disable CP_ABORT which is expensive to run.
 *
 * For user context, register a copro so that TLBIs are seen by the
 * nest MMU. mm_context_add/remove_vas_window() are used only for user
 * space windows.
 */
static inline void mm_context_add_vas_window(struct mm_struct *mm)
{
	atomic_inc(&mm->context.vas_windows);
	mm_context_add_copro(mm);
}

static inline void mm_context_remove_vas_window(struct mm_struct *mm)
{
	int v;

	mm_context_remove_copro(mm);
	v = atomic_dec_if_positive(&mm->context.vas_windows);

	/* Detect imbalance between add and remove */
	WARN_ON(v < 0);
}
#else
static inline void inc_mm_active_cpus(struct mm_struct *mm) { }
static inline void dec_mm_active_cpus(struct mm_struct *mm) { }
static inline void mm_context_add_copro(struct mm_struct *mm) { }
static inline void mm_context_remove_copro(struct mm_struct *mm) { }
#endif

#if defined(CONFIG_KVM_BOOK3S_HV_POSSIBLE) && defined(CONFIG_PPC_RADIX_MMU)
void do_h_rpt_invalidate_prt(unsigned long pid, unsigned long lpid,
			     unsigned long type, unsigned long pg_sizes,
			     unsigned long start, unsigned long end);
#else
static inline void do_h_rpt_invalidate_prt(unsigned long pid,
					   unsigned long lpid,
					   unsigned long type,
					   unsigned long pg_sizes,
					   unsigned long start,
					   unsigned long end) { }
#endif

extern void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
			       struct task_struct *tsk);

static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
			     struct task_struct *tsk)
{
	unsigned long flags;

	local_irq_save(flags);
	switch_mm_irqs_off(prev, next, tsk);
	local_irq_restore(flags);
}
#define switch_mm_irqs_off switch_mm_irqs_off

/*
 * After we have set current->mm to a new value, this activates
 * the context for the new mm so we see the new mappings.
 */
#define activate_mm activate_mm
static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
{
	switch_mm_irqs_off(prev, next, current);
}

/* We don't currently use enter_lazy_tlb() for anything */
#ifdef CONFIG_PPC_BOOK3E_64
#define enter_lazy_tlb enter_lazy_tlb
static inline void enter_lazy_tlb(struct mm_struct *mm,
				  struct task_struct *tsk)
{
	/* 64-bit Book3E keeps track of current PGD in the PACA */
	get_paca()->pgd = NULL;
}
#endif

extern void arch_exit_mmap(struct mm_struct *mm);

static inline void arch_unmap(struct mm_struct *mm,
			      unsigned long start, unsigned long end)
{
	unsigned long vdso_base = (unsigned long)mm->context.vdso;

	if (start <= vdso_base && vdso_base < end)
		mm->context.vdso = NULL;
}

#ifdef CONFIG_PPC_MEM_KEYS
bool arch_vma_access_permitted(struct vm_area_struct *vma, bool write,
			       bool execute, bool foreign);
void arch_dup_pkeys(struct mm_struct *oldmm, struct mm_struct *mm);
#else /* CONFIG_PPC_MEM_KEYS */
static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
		bool write, bool execute, bool foreign)
{
	/* by default, allow everything */
	return true;
}

#define pkey_mm_init(mm)
#define arch_dup_pkeys(oldmm, mm)

static inline u64 pte_to_hpte_pkey_bits(u64 pteflags, unsigned long flags)
{
	return 0x0UL;
}

#endif /* CONFIG_PPC_MEM_KEYS */

static inline int arch_dup_mmap(struct mm_struct *oldmm,
				struct mm_struct *mm)
{
	arch_dup_pkeys(oldmm, mm);
	return 0;
}

#include <asm-generic/mmu_context.h>

#endif /* __KERNEL__ */
#endif /* __ASM_POWERPC_MMU_CONTEXT_H */