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  * Some soft-masked interrupts must be hard masked until they are replayed
  34  * (e.g., because the soft-masked handler does not clear the exception).
  35  */
  36 #ifdef CONFIG_PPC_BOOK3S
  37 #define PACA_IRQ_MUST_HARD_MASK (PACA_IRQ_EE|PACA_IRQ_PMI)
  38 #else
  39 #define PACA_IRQ_MUST_HARD_MASK (PACA_IRQ_EE)
  40 #endif
  41
  42 /*
  43  * flags for paca->irq_soft_mask
  44  */
  45 #define IRQS_ENABLED            0
  46 #define IRQS_DISABLED           1 /* local_irq_disable() interrupts */
  47 #define IRQS_PMI_DISABLED       2
  48 #define IRQS_ALL_DISABLED       (IRQS_DISABLED | IRQS_PMI_DISABLED)
  49
  50 #endif /* CONFIG_PPC64 */
  51
  52 #ifndef __ASSEMBLY__
  53
  54 extern void replay_system_reset(void);
  55 extern void __replay_interrupt(unsigned int vector);
  56
  57 extern void timer_interrupt(struct pt_regs *);
  58 extern void performance_monitor_exception(struct pt_regs *regs);
  59 extern void WatchdogException(struct pt_regs *regs);
  60 extern void unknown_exception(struct pt_regs *regs);
  61
  62 #ifdef CONFIG_PPC64
  63 #include <asm/paca.h>
  64
  65 static inline notrace unsigned long irq_soft_mask_return(void)
  66 {
  67         unsigned long flags;
  68
  69         asm volatile(
  70                 "lbz %0,%1(13)"
  71                 : "=r" (flags)
  72                 : "i" (offsetof(struct paca_struct, irq_soft_mask)));
  73
  74         return flags;
  75 }
  76
  77 /*
  78  * The "memory" clobber acts as both a compiler barrier
  79  * for the critical section and as a clobber because
  80  * we changed paca->irq_soft_mask
  81  */
  82 static inline notrace void irq_soft_mask_set(unsigned long mask)
  83 {
  84 #ifdef CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
  85         /*
  86          * The irq mask must always include the STD bit if any are set.
  87          *
  88          * and interrupts don't get replayed until the standard
  89          * interrupt (local_irq_disable()) is unmasked.
  90          *
  91          * Other masks must only provide additional masking beyond
  92          * the standard, and they are also not replayed until the
  93          * standard interrupt becomes unmasked.
  94          *
  95          * This could be changed, but it will require partial
  96          * unmasks to be replayed, among other things. For now, take
  97          * the simple approach.
  98          */
  99         WARN_ON(mask && !(mask & IRQS_DISABLED));
 100 #endif
 101
 102         asm volatile(
 103                 "stb %0,%1(13)"
 104                 :
 105                 : "r" (mask),
 106                   "i" (offsetof(struct paca_struct, irq_soft_mask))
 107                 : "memory");
 108 }
 109
 110 static inline notrace unsigned long irq_soft_mask_set_return(unsigned long mask)
 111 {
 112         unsigned long flags;
 113
 114 #ifdef CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
 115         WARN_ON(mask && !(mask & IRQS_DISABLED));
 116 #endif
 117
 118         asm volatile(
 119                 "lbz %0,%1(13); stb %2,%1(13)"
 120                 : "=&r" (flags)
 121                 : "i" (offsetof(struct paca_struct, irq_soft_mask)),
 122                   "r" (mask)
 123                 : "memory");
 124
 125         return flags;
 126 }
 127
 128 static inline notrace unsigned long irq_soft_mask_or_return(unsigned long mask)
 129 {
 130         unsigned long flags, tmp;
 131
 132         asm volatile(
 133                 "lbz %0,%2(13); or %1,%0,%3; stb %1,%2(13)"
 134                 : "=&r" (flags), "=r" (tmp)
 135                 : "i" (offsetof(struct paca_struct, irq_soft_mask)),
 136                   "r" (mask)
 137                 : "memory");
 138
 139 #ifdef CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
 140         WARN_ON((mask | flags) && !((mask | flags) & IRQS_DISABLED));
 141 #endif
 142
 143         return flags;
 144 }
 145
 146 static inline unsigned long arch_local_save_flags(void)
 147 {
 148         return irq_soft_mask_return();
 149 }
 150
 151 static inline void arch_local_irq_disable(void)
 152 {
 153         irq_soft_mask_set(IRQS_DISABLED);
 154 }
 155
 156 extern void arch_local_irq_restore(unsigned long);
 157
 158 static inline void arch_local_irq_enable(void)
 159 {
 160         arch_local_irq_restore(IRQS_ENABLED);
 161 }
 162
 163 static inline unsigned long arch_local_irq_save(void)
 164 {
 165         return irq_soft_mask_set_return(IRQS_DISABLED);
 166 }
 167
 168 static inline bool arch_irqs_disabled_flags(unsigned long flags)
 169 {
 170         return flags & IRQS_DISABLED;
 171 }
 172
 173 static inline bool arch_irqs_disabled(void)
 174 {
 175         return arch_irqs_disabled_flags(arch_local_save_flags());
 176 }
 177
 178 #ifdef CONFIG_PPC_BOOK3S
 179 /*
 180  * To support disabling and enabling of irq with PMI, set of
 181  * new powerpc_local_irq_pmu_save() and powerpc_local_irq_restore()
 182  * functions are added. These macros are implemented using generic
 183  * linux local_irq_* code from include/linux/irqflags.h.
 184  */
 185 #define raw_local_irq_pmu_save(flags)                                   \
 186         do {                                                            \
 187                 typecheck(unsigned long, flags);                        \
 188                 flags = irq_soft_mask_or_return(IRQS_DISABLED | \
 189                                 IRQS_PMI_DISABLED);                     \
 190         } while(0)
 191
 192 #define raw_local_irq_pmu_restore(flags)                                \
 193         do {                                                            \
 194                 typecheck(unsigned long, flags);                        \
 195                 arch_local_irq_restore(flags);                          \
 196         } while(0)
 197
 198 #ifdef CONFIG_TRACE_IRQFLAGS
 199 #define powerpc_local_irq_pmu_save(flags)                       \
 200          do {                                                   \
 201                 raw_local_irq_pmu_save(flags);                  \
 202                 trace_hardirqs_off();                           \
 203         } while(0)
 204 #define powerpc_local_irq_pmu_restore(flags)                    \
 205         do {                                                    \
 206                 if (raw_irqs_disabled_flags(flags)) {           \
 207                         raw_local_irq_pmu_restore(flags);       \
 208                         trace_hardirqs_off();                   \
 209                 } else {                                        \
 210                         trace_hardirqs_on();                    \
 211                         raw_local_irq_pmu_restore(flags);       \
 212                 }                                               \
 213         } while(0)
 214 #else
 215 #define powerpc_local_irq_pmu_save(flags)                       \
 216         do {                                                    \
 217                 raw_local_irq_pmu_save(flags);                  \
 218         } while(0)
 219 #define powerpc_local_irq_pmu_restore(flags)                    \
 220         do {                                                    \
 221                 raw_local_irq_pmu_restore(flags);               \
 222         } while (0)
 223 #endif  /* CONFIG_TRACE_IRQFLAGS */
 224
 225 #endif /* CONFIG_PPC_BOOK3S */
 226
 227 #ifdef CONFIG_PPC_BOOK3E
 228 #define __hard_irq_enable()     asm volatile("wrteei 1" : : : "memory")
 229 #define __hard_irq_disable()    asm volatile("wrteei 0" : : : "memory")
 230 #else
 231 #define __hard_irq_enable()     __mtmsrd(local_paca->kernel_msr | MSR_EE, 1)
 232 #define __hard_irq_disable()    __mtmsrd(local_paca->kernel_msr, 1)
 233 #endif
 234
 235 #define hard_irq_disable()      do {                                    \
 236         unsigned long flags;                                            \
 237         __hard_irq_disable();                                           \
 238         flags = irq_soft_mask_set_return(IRQS_ALL_DISABLED);            \
 239         local_paca->irq_happened |= PACA_IRQ_HARD_DIS;                  \
 240         if (!arch_irqs_disabled_flags(flags))                           \
 241                 trace_hardirqs_off();                                   \
 242 } while(0)
 243
 244 static inline bool lazy_irq_pending(void)
 245 {
 246         return !!(get_paca()->irq_happened & ~PACA_IRQ_HARD_DIS);
 247 }
 248
 249 /*
 250  * This is called by asynchronous interrupts to conditionally
 251  * re-enable hard interrupts when soft-disabled after having
 252  * cleared the source of the interrupt
 253  */
 254 static inline void may_hard_irq_enable(void)
 255 {
 256         get_paca()->irq_happened &= ~PACA_IRQ_HARD_DIS;
 257         if (!(get_paca()->irq_happened & PACA_IRQ_MUST_HARD_MASK))
 258                 __hard_irq_enable();
 259 }
 260
 261 static inline bool arch_irq_disabled_regs(struct pt_regs *regs)
 262 {
 263         return (regs->softe & IRQS_DISABLED);
 264 }
 265
 266 extern bool prep_irq_for_idle(void);
 267 extern bool prep_irq_for_idle_irqsoff(void);
 268 extern void irq_set_pending_from_srr1(unsigned long srr1);
 269
 270 #define fini_irq_for_idle_irqsoff() trace_hardirqs_off();
 271
 272 extern void force_external_irq_replay(void);
 273
 274 #else /* CONFIG_PPC64 */
 275
 276 #define SET_MSR_EE(x)   mtmsr(x)
 277
 278 static inline unsigned long arch_local_save_flags(void)
 279 {
 280         return mfmsr();
 281 }
 282
 283 static inline void arch_local_irq_restore(unsigned long flags)
 284 {
 285 #if defined(CONFIG_BOOKE)
 286         asm volatile("wrtee %0" : : "r" (flags) : "memory");
 287 #else
 288         mtmsr(flags);
 289 #endif
 290 }
 291
 292 static inline unsigned long arch_local_irq_save(void)
 293 {
 294         unsigned long flags = arch_local_save_flags();
 295 #ifdef CONFIG_BOOKE
 296         asm volatile("wrteei 0" : : : "memory");
 297 #elif defined(CONFIG_PPC_8xx)
 298         wrtspr(SPRN_EID);
 299 #else
 300         SET_MSR_EE(flags & ~MSR_EE);
 301 #endif
 302         return flags;
 303 }
 304
 305 static inline void arch_local_irq_disable(void)
 306 {
 307 #ifdef CONFIG_BOOKE
 308         asm volatile("wrteei 0" : : : "memory");
 309 #elif defined(CONFIG_PPC_8xx)
 310         wrtspr(SPRN_EID);
 311 #else
 312         arch_local_irq_save();
 313 #endif
 314 }
 315
 316 static inline void arch_local_irq_enable(void)
 317 {
 318 #ifdef CONFIG_BOOKE
 319         asm volatile("wrteei 1" : : : "memory");
 320 #elif defined(CONFIG_PPC_8xx)
 321         wrtspr(SPRN_EIE);
 322 #else
 323         unsigned long msr = mfmsr();
 324         SET_MSR_EE(msr | MSR_EE);
 325 #endif
 326 }
 327
 328 static inline bool arch_irqs_disabled_flags(unsigned long flags)
 329 {
 330         return (flags & MSR_EE) == 0;
 331 }
 332
 333 static inline bool arch_irqs_disabled(void)
 334 {
 335         return arch_irqs_disabled_flags(arch_local_save_flags());
 336 }
 337
 338 #define hard_irq_disable()              arch_local_irq_disable()
 339
 340 static inline bool arch_irq_disabled_regs(struct pt_regs *regs)
 341 {
 342         return !(regs->msr & MSR_EE);
 343 }
 344
 345 static inline void may_hard_irq_enable(void) { }
 346
 347 #endif /* CONFIG_PPC64 */
 348
 349 #define ARCH_IRQ_INIT_FLAGS     IRQ_NOREQUEST
 350
 351 /*
 352  * interrupt-retrigger: should we handle this via lost interrupts and IPIs
 353  * or should we not care like we do now ? --BenH.
 354  */
 355 struct irq_chip;
 356
 357 #endif  /* __ASSEMBLY__ */
 358 #endif  /* __KERNEL__ */
 359 #endif  /* _ASM_POWERPC_HW_IRQ_H */