Merge tag 'pm-part2-4.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael...
[sfrench/cifs-2.6.git] / arch / powerpc / include / asm / hw_irq.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
4  */
5 #ifndef _ASM_POWERPC_HW_IRQ_H
6 #define _ASM_POWERPC_HW_IRQ_H
7
8 #ifdef __KERNEL__
9
10 #include <linux/errno.h>
11 #include <linux/compiler.h>
12 #include <asm/ptrace.h>
13 #include <asm/processor.h>
14
15 #ifdef CONFIG_PPC64
16
17 /*
18  * PACA flags in paca->irq_happened.
19  *
20  * This bits are set when interrupts occur while soft-disabled
21  * and allow a proper replay. Additionally, PACA_IRQ_HARD_DIS
22  * is set whenever we manually hard disable.
23  */
24 #define PACA_IRQ_HARD_DIS       0x01
25 #define PACA_IRQ_DBELL          0x02
26 #define PACA_IRQ_EE             0x04
27 #define PACA_IRQ_DEC            0x08 /* Or FIT */
28 #define PACA_IRQ_EE_EDGE        0x10 /* BookE only */
29 #define PACA_IRQ_HMI            0x20
30 #define PACA_IRQ_PMI            0x40
31
32 /*
33  * flags for paca->irq_soft_mask
34  */
35 #define IRQS_ENABLED            0
36 #define IRQS_DISABLED           1 /* local_irq_disable() interrupts */
37 #define IRQS_PMI_DISABLED       2
38 #define IRQS_ALL_DISABLED       (IRQS_DISABLED | IRQS_PMI_DISABLED)
39
40 #endif /* CONFIG_PPC64 */
41
42 #ifndef __ASSEMBLY__
43
44 extern void replay_system_reset(void);
45 extern void __replay_interrupt(unsigned int vector);
46
47 extern void timer_interrupt(struct pt_regs *);
48 extern void performance_monitor_exception(struct pt_regs *regs);
49 extern void WatchdogException(struct pt_regs *regs);
50 extern void unknown_exception(struct pt_regs *regs);
51
52 #ifdef CONFIG_PPC64
53 #include <asm/paca.h>
54
55 static inline notrace unsigned long irq_soft_mask_return(void)
56 {
57         unsigned long flags;
58
59         asm volatile(
60                 "lbz %0,%1(13)"
61                 : "=r" (flags)
62                 : "i" (offsetof(struct paca_struct, irq_soft_mask)));
63
64         return flags;
65 }
66
67 /*
68  * The "memory" clobber acts as both a compiler barrier
69  * for the critical section and as a clobber because
70  * we changed paca->irq_soft_mask
71  */
72 static inline notrace void irq_soft_mask_set(unsigned long mask)
73 {
74 #ifdef CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
75         /*
76          * The irq mask must always include the STD bit if any are set.
77          *
78          * and interrupts don't get replayed until the standard
79          * interrupt (local_irq_disable()) is unmasked.
80          *
81          * Other masks must only provide additional masking beyond
82          * the standard, and they are also not replayed until the
83          * standard interrupt becomes unmasked.
84          *
85          * This could be changed, but it will require partial
86          * unmasks to be replayed, among other things. For now, take
87          * the simple approach.
88          */
89         WARN_ON(mask && !(mask & IRQS_DISABLED));
90 #endif
91
92         asm volatile(
93                 "stb %0,%1(13)"
94                 :
95                 : "r" (mask),
96                   "i" (offsetof(struct paca_struct, irq_soft_mask))
97                 : "memory");
98 }
99
100 static inline notrace unsigned long irq_soft_mask_set_return(unsigned long mask)
101 {
102         unsigned long flags;
103
104 #ifdef CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
105         WARN_ON(mask && !(mask & IRQS_DISABLED));
106 #endif
107
108         asm volatile(
109                 "lbz %0,%1(13); stb %2,%1(13)"
110                 : "=&r" (flags)
111                 : "i" (offsetof(struct paca_struct, irq_soft_mask)),
112                   "r" (mask)
113                 : "memory");
114
115         return flags;
116 }
117
118 static inline notrace unsigned long irq_soft_mask_or_return(unsigned long mask)
119 {
120         unsigned long flags, tmp;
121
122         asm volatile(
123                 "lbz %0,%2(13); or %1,%0,%3; stb %1,%2(13)"
124                 : "=&r" (flags), "=r" (tmp)
125                 : "i" (offsetof(struct paca_struct, irq_soft_mask)),
126                   "r" (mask)
127                 : "memory");
128
129 #ifdef CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
130         WARN_ON((mask | flags) && !((mask | flags) & IRQS_DISABLED));
131 #endif
132
133         return flags;
134 }
135
136 static inline unsigned long arch_local_save_flags(void)
137 {
138         return irq_soft_mask_return();
139 }
140
141 static inline void arch_local_irq_disable(void)
142 {
143         irq_soft_mask_set(IRQS_DISABLED);
144 }
145
146 extern void arch_local_irq_restore(unsigned long);
147
148 static inline void arch_local_irq_enable(void)
149 {
150         arch_local_irq_restore(IRQS_ENABLED);
151 }
152
153 static inline unsigned long arch_local_irq_save(void)
154 {
155         return irq_soft_mask_set_return(IRQS_DISABLED);
156 }
157
158 static inline bool arch_irqs_disabled_flags(unsigned long flags)
159 {
160         return flags & IRQS_DISABLED;
161 }
162
163 static inline bool arch_irqs_disabled(void)
164 {
165         return arch_irqs_disabled_flags(arch_local_save_flags());
166 }
167
168 #ifdef CONFIG_PPC_BOOK3S
169 /*
170  * To support disabling and enabling of irq with PMI, set of
171  * new powerpc_local_irq_pmu_save() and powerpc_local_irq_restore()
172  * functions are added. These macros are implemented using generic
173  * linux local_irq_* code from include/linux/irqflags.h.
174  */
175 #define raw_local_irq_pmu_save(flags)                                   \
176         do {                                                            \
177                 typecheck(unsigned long, flags);                        \
178                 flags = irq_soft_mask_or_return(IRQS_DISABLED | \
179                                 IRQS_PMI_DISABLED);                     \
180         } while(0)
181
182 #define raw_local_irq_pmu_restore(flags)                                \
183         do {                                                            \
184                 typecheck(unsigned long, flags);                        \
185                 arch_local_irq_restore(flags);                          \
186         } while(0)
187
188 #ifdef CONFIG_TRACE_IRQFLAGS
189 #define powerpc_local_irq_pmu_save(flags)                       \
190          do {                                                   \
191                 raw_local_irq_pmu_save(flags);                  \
192                 trace_hardirqs_off();                           \
193         } while(0)
194 #define powerpc_local_irq_pmu_restore(flags)                    \
195         do {                                                    \
196                 if (raw_irqs_disabled_flags(flags)) {           \
197                         raw_local_irq_pmu_restore(flags);       \
198                         trace_hardirqs_off();                   \
199                 } else {                                        \
200                         trace_hardirqs_on();                    \
201                         raw_local_irq_pmu_restore(flags);       \
202                 }                                               \
203         } while(0)
204 #else
205 #define powerpc_local_irq_pmu_save(flags)                       \
206         do {                                                    \
207                 raw_local_irq_pmu_save(flags);                  \
208         } while(0)
209 #define powerpc_local_irq_pmu_restore(flags)                    \
210         do {                                                    \
211                 raw_local_irq_pmu_restore(flags);               \
212         } while (0)
213 #endif  /* CONFIG_TRACE_IRQFLAGS */
214
215 #endif /* CONFIG_PPC_BOOK3S */
216
217 #ifdef CONFIG_PPC_BOOK3E
218 #define __hard_irq_enable()     asm volatile("wrteei 1" : : : "memory")
219 #define __hard_irq_disable()    asm volatile("wrteei 0" : : : "memory")
220 #else
221 #define __hard_irq_enable()     __mtmsrd(local_paca->kernel_msr | MSR_EE, 1)
222 #define __hard_irq_disable()    __mtmsrd(local_paca->kernel_msr, 1)
223 #endif
224
225 #define hard_irq_disable()      do {                                    \
226         unsigned long flags;                                            \
227         __hard_irq_disable();                                           \
228         flags = irq_soft_mask_set_return(IRQS_ALL_DISABLED);            \
229         local_paca->irq_happened |= PACA_IRQ_HARD_DIS;                  \
230         if (!arch_irqs_disabled_flags(flags))                           \
231                 trace_hardirqs_off();                                   \
232 } while(0)
233
234 static inline bool lazy_irq_pending(void)
235 {
236         return !!(get_paca()->irq_happened & ~PACA_IRQ_HARD_DIS);
237 }
238
239 /*
240  * This is called by asynchronous interrupts to conditionally
241  * re-enable hard interrupts when soft-disabled after having
242  * cleared the source of the interrupt
243  */
244 static inline void may_hard_irq_enable(void)
245 {
246         get_paca()->irq_happened &= ~PACA_IRQ_HARD_DIS;
247         if (!(get_paca()->irq_happened & PACA_IRQ_EE))
248                 __hard_irq_enable();
249 }
250
251 static inline bool arch_irq_disabled_regs(struct pt_regs *regs)
252 {
253         return (regs->softe & IRQS_DISABLED);
254 }
255
256 extern bool prep_irq_for_idle(void);
257 extern bool prep_irq_for_idle_irqsoff(void);
258 extern void irq_set_pending_from_srr1(unsigned long srr1);
259
260 #define fini_irq_for_idle_irqsoff() trace_hardirqs_off();
261
262 extern void force_external_irq_replay(void);
263
264 #else /* CONFIG_PPC64 */
265
266 #define SET_MSR_EE(x)   mtmsr(x)
267
268 static inline unsigned long arch_local_save_flags(void)
269 {
270         return mfmsr();
271 }
272
273 static inline void arch_local_irq_restore(unsigned long flags)
274 {
275 #if defined(CONFIG_BOOKE)
276         asm volatile("wrtee %0" : : "r" (flags) : "memory");
277 #else
278         mtmsr(flags);
279 #endif
280 }
281
282 static inline unsigned long arch_local_irq_save(void)
283 {
284         unsigned long flags = arch_local_save_flags();
285 #ifdef CONFIG_BOOKE
286         asm volatile("wrteei 0" : : : "memory");
287 #elif defined(CONFIG_PPC_8xx)
288         wrtspr(SPRN_EID);
289 #else
290         SET_MSR_EE(flags & ~MSR_EE);
291 #endif
292         return flags;
293 }
294
295 static inline void arch_local_irq_disable(void)
296 {
297 #ifdef CONFIG_BOOKE
298         asm volatile("wrteei 0" : : : "memory");
299 #elif defined(CONFIG_PPC_8xx)
300         wrtspr(SPRN_EID);
301 #else
302         arch_local_irq_save();
303 #endif
304 }
305
306 static inline void arch_local_irq_enable(void)
307 {
308 #ifdef CONFIG_BOOKE
309         asm volatile("wrteei 1" : : : "memory");
310 #elif defined(CONFIG_PPC_8xx)
311         wrtspr(SPRN_EIE);
312 #else
313         unsigned long msr = mfmsr();
314         SET_MSR_EE(msr | MSR_EE);
315 #endif
316 }
317
318 static inline bool arch_irqs_disabled_flags(unsigned long flags)
319 {
320         return (flags & MSR_EE) == 0;
321 }
322
323 static inline bool arch_irqs_disabled(void)
324 {
325         return arch_irqs_disabled_flags(arch_local_save_flags());
326 }
327
328 #define hard_irq_disable()              arch_local_irq_disable()
329
330 static inline bool arch_irq_disabled_regs(struct pt_regs *regs)
331 {
332         return !(regs->msr & MSR_EE);
333 }
334
335 static inline void may_hard_irq_enable(void) { }
336
337 #endif /* CONFIG_PPC64 */
338
339 #define ARCH_IRQ_INIT_FLAGS     IRQ_NOREQUEST
340
341 /*
342  * interrupt-retrigger: should we handle this via lost interrupts and IPIs
343  * or should we not care like we do now ? --BenH.
344  */
345 struct irq_chip;
346
347 #endif  /* __ASSEMBLY__ */
348 #endif  /* __KERNEL__ */
349 #endif  /* _ASM_POWERPC_HW_IRQ_H */