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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_POWERPC_MMU_CONTEXT_H
3#define __ASM_POWERPC_MMU_CONTEXT_H
4#ifdef __KERNEL__
5
6#include <linux/kernel.h>
7#include <linux/mm.h>
8#include <linux/sched.h>
9#include <linux/spinlock.h>
10#include <asm/mmu.h>
11#include <asm/cputable.h>
12#include <asm/cputhreads.h>
13
14/*
15 * Most if the context management is out of line
16 */
17#define init_new_context init_new_context
18extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
19#define destroy_context destroy_context
20extern void destroy_context(struct mm_struct *mm);
21#ifdef CONFIG_SPAPR_TCE_IOMMU
22struct mm_iommu_table_group_mem_t;
23
24extern bool mm_iommu_preregistered(struct mm_struct *mm);
25extern long mm_iommu_new(struct mm_struct *mm,
26 unsigned long ua, unsigned long entries,
27 struct mm_iommu_table_group_mem_t **pmem);
28extern long mm_iommu_newdev(struct mm_struct *mm, unsigned long ua,
29 unsigned long entries, unsigned long dev_hpa,
30 struct mm_iommu_table_group_mem_t **pmem);
31extern long mm_iommu_put(struct mm_struct *mm,
32 struct mm_iommu_table_group_mem_t *mem);
33extern void mm_iommu_init(struct mm_struct *mm);
34extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup(struct mm_struct *mm,
35 unsigned long ua, unsigned long size);
36extern struct mm_iommu_table_group_mem_t *mm_iommu_get(struct mm_struct *mm,
37 unsigned long ua, unsigned long entries);
38extern long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem,
39 unsigned long ua, unsigned int pageshift, unsigned long *hpa);
40extern bool mm_iommu_is_devmem(struct mm_struct *mm, unsigned long hpa,
41 unsigned int pageshift, unsigned long *size);
42extern long mm_iommu_mapped_inc(struct mm_iommu_table_group_mem_t *mem);
43extern void mm_iommu_mapped_dec(struct mm_iommu_table_group_mem_t *mem);
44#else
45static inline bool mm_iommu_is_devmem(struct mm_struct *mm, unsigned long hpa,
46 unsigned int pageshift, unsigned long *size)
47{
48 return false;
49}
50static inline void mm_iommu_init(struct mm_struct *mm) { }
51#endif
52extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
53
54#ifdef CONFIG_PPC_BOOK3S_64
55extern void radix__switch_mmu_context(struct mm_struct *prev,
56 struct mm_struct *next);
57static inline void switch_mmu_context(struct mm_struct *prev,
58 struct mm_struct *next,
59 struct task_struct *tsk)
60{
61 if (radix_enabled())
62 return radix__switch_mmu_context(prev, next);
63 return switch_slb(tsk, next);
64}
65
66extern int hash__alloc_context_id(void);
67void __init hash__reserve_context_id(int id);
68extern void __destroy_context(int context_id);
69static inline void mmu_context_init(void) { }
70
71#ifdef CONFIG_PPC_64S_HASH_MMU
72static inline int alloc_extended_context(struct mm_struct *mm,
73 unsigned long ea)
74{
75 int context_id;
76
77 int index = ea >> MAX_EA_BITS_PER_CONTEXT;
78
79 context_id = hash__alloc_context_id();
80 if (context_id < 0)
81 return context_id;
82
83 VM_WARN_ON(mm->context.extended_id[index]);
84 mm->context.extended_id[index] = context_id;
85 return context_id;
86}
87
88static inline bool need_extra_context(struct mm_struct *mm, unsigned long ea)
89{
90 int context_id;
91
92 context_id = get_user_context(&mm->context, ea);
93 if (!context_id)
94 return true;
95 return false;
96}
97#endif
98
99#else
100extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next,
101 struct task_struct *tsk);
102extern unsigned long __init_new_context(void);
103extern void __destroy_context(unsigned long context_id);
104extern void mmu_context_init(void);
105static inline int alloc_extended_context(struct mm_struct *mm,
106 unsigned long ea)
107{
108 /* non book3s_64 should never find this called */
109 WARN_ON(1);
110 return -ENOMEM;
111}
112
113static inline bool need_extra_context(struct mm_struct *mm, unsigned long ea)
114{
115 return false;
116}
117#endif
118
119extern int use_cop(unsigned long acop, struct mm_struct *mm);
120extern void drop_cop(unsigned long acop, struct mm_struct *mm);
121
122#ifdef CONFIG_PPC_BOOK3S_64
123static inline void inc_mm_active_cpus(struct mm_struct *mm)
124{
125 atomic_inc(&mm->context.active_cpus);
126}
127
128static inline void dec_mm_active_cpus(struct mm_struct *mm)
129{
130 VM_WARN_ON_ONCE(atomic_read(&mm->context.active_cpus) <= 0);
131 atomic_dec(&mm->context.active_cpus);
132}
133
134static inline void mm_context_add_copro(struct mm_struct *mm)
135{
136 /*
137 * If any copro is in use, increment the active CPU count
138 * in order to force TLB invalidations to be global as to
139 * propagate to the Nest MMU.
140 */
141 if (atomic_inc_return(&mm->context.copros) == 1)
142 inc_mm_active_cpus(mm);
143}
144
145static inline void mm_context_remove_copro(struct mm_struct *mm)
146{
147 int c;
148
149 /*
150 * When removing the last copro, we need to broadcast a global
151 * flush of the full mm, as the next TLBI may be local and the
152 * nMMU and/or PSL need to be cleaned up.
153 *
154 * Both the 'copros' and 'active_cpus' counts are looked at in
155 * radix__flush_all_mm() to determine the scope (local/global)
156 * of the TLBIs, so we need to flush first before decrementing
157 * 'copros'. If this API is used by several callers for the
158 * same context, it can lead to over-flushing. It's hopefully
159 * not common enough to be a problem.
160 *
161 * Skip on hash, as we don't know how to do the proper flush
162 * for the time being. Invalidations will remain global if
163 * used on hash. Note that we can't drop 'copros' either, as
164 * it could make some invalidations local with no flush
165 * in-between.
166 */
167 if (radix_enabled()) {
168 radix__flush_all_mm(mm);
169
170 c = atomic_dec_if_positive(&mm->context.copros);
171 /* Detect imbalance between add and remove */
172 WARN_ON(c < 0);
173
174 if (c == 0)
175 dec_mm_active_cpus(mm);
176 }
177}
178
179/*
180 * vas_windows counter shows number of open windows in the mm
181 * context. During context switch, use this counter to clear the
182 * foreign real address mapping (CP_ABORT) for the thread / process
183 * that intend to use COPY/PASTE. When a process closes all windows,
184 * disable CP_ABORT which is expensive to run.
185 *
186 * For user context, register a copro so that TLBIs are seen by the
187 * nest MMU. mm_context_add/remove_vas_window() are used only for user
188 * space windows.
189 */
190static inline void mm_context_add_vas_window(struct mm_struct *mm)
191{
192 atomic_inc(&mm->context.vas_windows);
193 mm_context_add_copro(mm);
194}
195
196static inline void mm_context_remove_vas_window(struct mm_struct *mm)
197{
198 int v;
199
200 mm_context_remove_copro(mm);
201 v = atomic_dec_if_positive(&mm->context.vas_windows);
202
203 /* Detect imbalance between add and remove */
204 WARN_ON(v < 0);
205}
206#else
207static inline void inc_mm_active_cpus(struct mm_struct *mm) { }
208static inline void dec_mm_active_cpus(struct mm_struct *mm) { }
209static inline void mm_context_add_copro(struct mm_struct *mm) { }
210static inline void mm_context_remove_copro(struct mm_struct *mm) { }
211#endif
212
213#if defined(CONFIG_KVM_BOOK3S_HV_POSSIBLE) && defined(CONFIG_PPC_RADIX_MMU)
214void do_h_rpt_invalidate_prt(unsigned long pid, unsigned long lpid,
215 unsigned long type, unsigned long pg_sizes,
216 unsigned long start, unsigned long end);
217#else
218static inline void do_h_rpt_invalidate_prt(unsigned long pid,
219 unsigned long lpid,
220 unsigned long type,
221 unsigned long pg_sizes,
222 unsigned long start,
223 unsigned long end) { }
224#endif
225
226extern void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
227 struct task_struct *tsk);
228
229static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
230 struct task_struct *tsk)
231{
232 unsigned long flags;
233
234 local_irq_save(flags);
235 switch_mm_irqs_off(prev, next, tsk);
236 local_irq_restore(flags);
237}
238#define switch_mm_irqs_off switch_mm_irqs_off
239
240/*
241 * After we have set current->mm to a new value, this activates
242 * the context for the new mm so we see the new mappings.
243 */
244#define activate_mm activate_mm
245static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
246{
247 switch_mm_irqs_off(prev, next, current);
248}
249
250/* We don't currently use enter_lazy_tlb() for anything */
251#ifdef CONFIG_PPC_BOOK3E_64
252#define enter_lazy_tlb enter_lazy_tlb
253static inline void enter_lazy_tlb(struct mm_struct *mm,
254 struct task_struct *tsk)
255{
256 /* 64-bit Book3E keeps track of current PGD in the PACA */
257 get_paca()->pgd = NULL;
258}
259#endif
260
261extern void arch_exit_mmap(struct mm_struct *mm);
262
263static inline void arch_unmap(struct mm_struct *mm,
264 unsigned long start, unsigned long end)
265{
266 unsigned long vdso_base = (unsigned long)mm->context.vdso;
267
268 if (start <= vdso_base && vdso_base < end)
269 mm->context.vdso = NULL;
270}
271
272#ifdef CONFIG_PPC_MEM_KEYS
273bool arch_vma_access_permitted(struct vm_area_struct *vma, bool write,
274 bool execute, bool foreign);
275void arch_dup_pkeys(struct mm_struct *oldmm, struct mm_struct *mm);
276#else /* CONFIG_PPC_MEM_KEYS */
277static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
278 bool write, bool execute, bool foreign)
279{
280 /* by default, allow everything */
281 return true;
282}
283
284#define pkey_mm_init(mm)
285#define arch_dup_pkeys(oldmm, mm)
286
287static inline u64 pte_to_hpte_pkey_bits(u64 pteflags, unsigned long flags)
288{
289 return 0x0UL;
290}
291
292#endif /* CONFIG_PPC_MEM_KEYS */
293
294static inline int arch_dup_mmap(struct mm_struct *oldmm,
295 struct mm_struct *mm)
296{
297 arch_dup_pkeys(oldmm, mm);
298 return 0;
299}
300
301#include <asm-generic/mmu_context.h>
302
303#endif /* __KERNEL__ */
304#endif /* __ASM_POWERPC_MMU_CONTEXT_H */
1#ifndef __ASM_POWERPC_MMU_CONTEXT_H
2#define __ASM_POWERPC_MMU_CONTEXT_H
3#ifdef __KERNEL__
4
5#include <linux/kernel.h>
6#include <linux/mm.h>
7#include <linux/sched.h>
8#include <linux/spinlock.h>
9#include <asm/mmu.h>
10#include <asm/cputable.h>
11#include <asm-generic/mm_hooks.h>
12#include <asm/cputhreads.h>
13
14/*
15 * Most if the context management is out of line
16 */
17extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
18extern void destroy_context(struct mm_struct *mm);
19
20extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next);
21extern void switch_stab(struct task_struct *tsk, struct mm_struct *mm);
22extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
23extern void set_context(unsigned long id, pgd_t *pgd);
24
25#ifdef CONFIG_PPC_BOOK3S_64
26extern int __init_new_context(void);
27extern void __destroy_context(int context_id);
28static inline void mmu_context_init(void) { }
29#else
30extern unsigned long __init_new_context(void);
31extern void __destroy_context(unsigned long context_id);
32extern void mmu_context_init(void);
33#endif
34
35extern void switch_cop(struct mm_struct *next);
36extern int use_cop(unsigned long acop, struct mm_struct *mm);
37extern void drop_cop(unsigned long acop, struct mm_struct *mm);
38
39/*
40 * switch_mm is the entry point called from the architecture independent
41 * code in kernel/sched.c
42 */
43static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
44 struct task_struct *tsk)
45{
46 /* Mark this context has been used on the new CPU */
47 cpumask_set_cpu(smp_processor_id(), mm_cpumask(next));
48
49 /* 32-bit keeps track of the current PGDIR in the thread struct */
50#ifdef CONFIG_PPC32
51 tsk->thread.pgdir = next->pgd;
52#endif /* CONFIG_PPC32 */
53
54 /* 64-bit Book3E keeps track of current PGD in the PACA */
55#ifdef CONFIG_PPC_BOOK3E_64
56 get_paca()->pgd = next->pgd;
57#endif
58 /* Nothing else to do if we aren't actually switching */
59 if (prev == next)
60 return;
61
62#ifdef CONFIG_PPC_ICSWX
63 /* Switch coprocessor context only if prev or next uses a coprocessor */
64 if (prev->context.acop || next->context.acop)
65 switch_cop(next);
66#endif /* CONFIG_PPC_ICSWX */
67
68 /* We must stop all altivec streams before changing the HW
69 * context
70 */
71#ifdef CONFIG_ALTIVEC
72 if (cpu_has_feature(CPU_FTR_ALTIVEC))
73 asm volatile ("dssall");
74#endif /* CONFIG_ALTIVEC */
75
76 /* The actual HW switching method differs between the various
77 * sub architectures.
78 */
79#ifdef CONFIG_PPC_STD_MMU_64
80 if (mmu_has_feature(MMU_FTR_SLB))
81 switch_slb(tsk, next);
82 else
83 switch_stab(tsk, next);
84#else
85 /* Out of line for now */
86 switch_mmu_context(prev, next);
87#endif
88
89}
90
91#define deactivate_mm(tsk,mm) do { } while (0)
92
93/*
94 * After we have set current->mm to a new value, this activates
95 * the context for the new mm so we see the new mappings.
96 */
97static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
98{
99 unsigned long flags;
100
101 local_irq_save(flags);
102 switch_mm(prev, next, current);
103 local_irq_restore(flags);
104}
105
106/* We don't currently use enter_lazy_tlb() for anything */
107static inline void enter_lazy_tlb(struct mm_struct *mm,
108 struct task_struct *tsk)
109{
110 /* 64-bit Book3E keeps track of current PGD in the PACA */
111#ifdef CONFIG_PPC_BOOK3E_64
112 get_paca()->pgd = NULL;
113#endif
114}
115
116#endif /* __KERNEL__ */
117#endif /* __ASM_POWERPC_MMU_CONTEXT_H */