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_soft_interrupts(void); 56 57 extern void timer_interrupt(struct pt_regs *); 58 extern void timer_broadcast_interrupt(void); 59 extern void performance_monitor_exception(struct pt_regs *regs); 60 extern void WatchdogException(struct pt_regs *regs); 61 extern void unknown_exception(struct pt_regs *regs); 62 63 #ifdef CONFIG_PPC64 64 #include <asm/paca.h> 65 66 static inline notrace unsigned long irq_soft_mask_return(void) 67 { 68 unsigned long flags; 69 70 asm volatile( 71 "lbz %0,%1(13)" 72 : "=r" (flags) 73 : "i" (offsetof(struct paca_struct, irq_soft_mask))); 74 75 return flags; 76 } 77 78 /* 79 * The "memory" clobber acts as both a compiler barrier 80 * for the critical section and as a clobber because 81 * we changed paca->irq_soft_mask 82 */ 83 static inline notrace void irq_soft_mask_set(unsigned long mask) 84 { 85 #ifdef CONFIG_PPC_IRQ_SOFT_MASK_DEBUG 86 /* 87 * The irq mask must always include the STD bit if any are set. 88 * 89 * and interrupts don't get replayed until the standard 90 * interrupt (local_irq_disable()) is unmasked. 91 * 92 * Other masks must only provide additional masking beyond 93 * the standard, and they are also not replayed until the 94 * standard interrupt becomes unmasked. 95 * 96 * This could be changed, but it will require partial 97 * unmasks to be replayed, among other things. For now, take 98 * the simple approach. 99 */ 100 WARN_ON(mask && !(mask & IRQS_DISABLED)); 101 #endif 102 103 asm volatile( 104 "stb %0,%1(13)" 105 : 106 : "r" (mask), 107 "i" (offsetof(struct paca_struct, irq_soft_mask)) 108 : "memory"); 109 } 110 111 static inline notrace unsigned long irq_soft_mask_set_return(unsigned long mask) 112 { 113 unsigned long flags; 114 115 #ifdef CONFIG_PPC_IRQ_SOFT_MASK_DEBUG 116 WARN_ON(mask && !(mask & IRQS_DISABLED)); 117 #endif 118 119 asm volatile( 120 "lbz %0,%1(13); stb %2,%1(13)" 121 : "=&r" (flags) 122 : "i" (offsetof(struct paca_struct, irq_soft_mask)), 123 "r" (mask) 124 : "memory"); 125 126 return flags; 127 } 128 129 static inline notrace unsigned long irq_soft_mask_or_return(unsigned long mask) 130 { 131 unsigned long flags, tmp; 132 133 asm volatile( 134 "lbz %0,%2(13); or %1,%0,%3; stb %1,%2(13)" 135 : "=&r" (flags), "=r" (tmp) 136 : "i" (offsetof(struct paca_struct, irq_soft_mask)), 137 "r" (mask) 138 : "memory"); 139 140 #ifdef CONFIG_PPC_IRQ_SOFT_MASK_DEBUG 141 WARN_ON((mask | flags) && !((mask | flags) & IRQS_DISABLED)); 142 #endif 143 144 return flags; 145 } 146 147 static inline unsigned long arch_local_save_flags(void) 148 { 149 return irq_soft_mask_return(); 150 } 151 152 static inline void arch_local_irq_disable(void) 153 { 154 irq_soft_mask_set(IRQS_DISABLED); 155 } 156 157 extern void arch_local_irq_restore(unsigned long); 158 159 static inline void arch_local_irq_enable(void) 160 { 161 arch_local_irq_restore(IRQS_ENABLED); 162 } 163 164 static inline unsigned long arch_local_irq_save(void) 165 { 166 return irq_soft_mask_set_return(IRQS_DISABLED); 167 } 168 169 static inline bool arch_irqs_disabled_flags(unsigned long flags) 170 { 171 return flags & IRQS_DISABLED; 172 } 173 174 static inline bool arch_irqs_disabled(void) 175 { 176 return arch_irqs_disabled_flags(arch_local_save_flags()); 177 } 178 179 #ifdef CONFIG_PPC_BOOK3S 180 /* 181 * To support disabling and enabling of irq with PMI, set of 182 * new powerpc_local_irq_pmu_save() and powerpc_local_irq_restore() 183 * functions are added. These macros are implemented using generic 184 * linux local_irq_* code from include/linux/irqflags.h. 185 */ 186 #define raw_local_irq_pmu_save(flags) \ 187 do { \ 188 typecheck(unsigned long, flags); \ 189 flags = irq_soft_mask_or_return(IRQS_DISABLED | \ 190 IRQS_PMI_DISABLED); \ 191 } while(0) 192 193 #define raw_local_irq_pmu_restore(flags) \ 194 do { \ 195 typecheck(unsigned long, flags); \ 196 arch_local_irq_restore(flags); \ 197 } while(0) 198 199 #ifdef CONFIG_TRACE_IRQFLAGS 200 #define powerpc_local_irq_pmu_save(flags) \ 201 do { \ 202 raw_local_irq_pmu_save(flags); \ 203 if (!raw_irqs_disabled_flags(flags)) \ 204 trace_hardirqs_off(); \ 205 } while(0) 206 #define powerpc_local_irq_pmu_restore(flags) \ 207 do { \ 208 if (!raw_irqs_disabled_flags(flags)) \ 209 trace_hardirqs_on(); \ 210 raw_local_irq_pmu_restore(flags); \ 211 } while(0) 212 #else 213 #define powerpc_local_irq_pmu_save(flags) \ 214 do { \ 215 raw_local_irq_pmu_save(flags); \ 216 } while(0) 217 #define powerpc_local_irq_pmu_restore(flags) \ 218 do { \ 219 raw_local_irq_pmu_restore(flags); \ 220 } while (0) 221 #endif /* CONFIG_TRACE_IRQFLAGS */ 222 223 #endif /* CONFIG_PPC_BOOK3S */ 224 225 #ifdef CONFIG_PPC_BOOK3E 226 #define __hard_irq_enable() wrtee(MSR_EE) 227 #define __hard_irq_disable() wrtee(0) 228 #define __hard_EE_RI_disable() wrtee(0) 229 #define __hard_RI_enable() do { } while (0) 230 #else 231 #define __hard_irq_enable() __mtmsrd(MSR_EE|MSR_RI, 1) 232 #define __hard_irq_disable() __mtmsrd(MSR_RI, 1) 233 #define __hard_EE_RI_disable() __mtmsrd(0, 1) 234 #define __hard_RI_enable() __mtmsrd(MSR_RI, 1) 235 #endif 236 237 #define hard_irq_disable() do { \ 238 unsigned long flags; \ 239 __hard_irq_disable(); \ 240 flags = irq_soft_mask_set_return(IRQS_ALL_DISABLED); \ 241 local_paca->irq_happened |= PACA_IRQ_HARD_DIS; \ 242 if (!arch_irqs_disabled_flags(flags)) { \ 243 asm ("stdx %%r1, 0, %1 ;" \ 244 : "=m" (local_paca->saved_r1) \ 245 : "b" (&local_paca->saved_r1)); \ 246 trace_hardirqs_off(); \ 247 } \ 248 } while(0) 249 250 static inline bool __lazy_irq_pending(u8 irq_happened) 251 { 252 return !!(irq_happened & ~PACA_IRQ_HARD_DIS); 253 } 254 255 /* 256 * Check if a lazy IRQ is pending. Should be called with IRQs hard disabled. 257 */ 258 static inline bool lazy_irq_pending(void) 259 { 260 return __lazy_irq_pending(get_paca()->irq_happened); 261 } 262 263 /* 264 * Check if a lazy IRQ is pending, with no debugging checks. 265 * Should be called with IRQs hard disabled. 266 * For use in RI disabled code or other constrained situations. 267 */ 268 static inline bool lazy_irq_pending_nocheck(void) 269 { 270 return __lazy_irq_pending(local_paca->irq_happened); 271 } 272 273 /* 274 * This is called by asynchronous interrupts to conditionally 275 * re-enable hard interrupts after having cleared the source 276 * of the interrupt. They are kept disabled if there is a different 277 * soft-masked interrupt pending that requires hard masking. 278 */ 279 static inline void may_hard_irq_enable(void) 280 { 281 if (!(get_paca()->irq_happened & PACA_IRQ_MUST_HARD_MASK)) { 282 get_paca()->irq_happened &= ~PACA_IRQ_HARD_DIS; 283 __hard_irq_enable(); 284 } 285 } 286 287 static inline bool arch_irq_disabled_regs(struct pt_regs *regs) 288 { 289 return (regs->softe & IRQS_DISABLED); 290 } 291 292 extern bool prep_irq_for_idle(void); 293 extern bool prep_irq_for_idle_irqsoff(void); 294 extern void irq_set_pending_from_srr1(unsigned long srr1); 295 296 #define fini_irq_for_idle_irqsoff() trace_hardirqs_off(); 297 298 extern void force_external_irq_replay(void); 299 300 #else /* CONFIG_PPC64 */ 301 302 static inline unsigned long arch_local_save_flags(void) 303 { 304 return mfmsr(); 305 } 306 307 static inline void arch_local_irq_restore(unsigned long flags) 308 { 309 if (IS_ENABLED(CONFIG_BOOKE)) 310 wrtee(flags); 311 else 312 mtmsr(flags); 313 } 314 315 static inline unsigned long arch_local_irq_save(void) 316 { 317 unsigned long flags = arch_local_save_flags(); 318 319 if (IS_ENABLED(CONFIG_BOOKE)) 320 wrtee(0); 321 else if (IS_ENABLED(CONFIG_PPC_8xx)) 322 wrtspr(SPRN_EID); 323 else 324 mtmsr(flags & ~MSR_EE); 325 326 return flags; 327 } 328 329 static inline void arch_local_irq_disable(void) 330 { 331 if (IS_ENABLED(CONFIG_BOOKE)) 332 wrtee(0); 333 else if (IS_ENABLED(CONFIG_PPC_8xx)) 334 wrtspr(SPRN_EID); 335 else 336 mtmsr(mfmsr() & ~MSR_EE); 337 } 338 339 static inline void arch_local_irq_enable(void) 340 { 341 if (IS_ENABLED(CONFIG_BOOKE)) 342 wrtee(MSR_EE); 343 else if (IS_ENABLED(CONFIG_PPC_8xx)) 344 wrtspr(SPRN_EIE); 345 else 346 mtmsr(mfmsr() | MSR_EE); 347 } 348 349 static inline bool arch_irqs_disabled_flags(unsigned long flags) 350 { 351 return (flags & MSR_EE) == 0; 352 } 353 354 static inline bool arch_irqs_disabled(void) 355 { 356 return arch_irqs_disabled_flags(arch_local_save_flags()); 357 } 358 359 #define hard_irq_disable() arch_local_irq_disable() 360 361 static inline bool arch_irq_disabled_regs(struct pt_regs *regs) 362 { 363 return !(regs->msr & MSR_EE); 364 } 365 366 static inline void may_hard_irq_enable(void) { } 367 368 #endif /* CONFIG_PPC64 */ 369 370 #define ARCH_IRQ_INIT_FLAGS IRQ_NOREQUEST 371 372 /* 373 * interrupt-retrigger: should we handle this via lost interrupts and IPIs 374 * or should we not care like we do now ? --BenH. 375 */ 376 struct irq_chip; 377 378 #endif /* __ASSEMBLY__ */ 379 #endif /* __KERNEL__ */ 380 #endif /* _ASM_POWERPC_HW_IRQ_H */ 381