1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * internal.h - printk internal definitions 4 */ 5 #include <linux/percpu.h> 6 7 #ifdef CONFIG_PRINTK 8 9 #define PRINTK_SAFE_CONTEXT_MASK 0x007ffffff 10 #define PRINTK_NMI_DIRECT_CONTEXT_MASK 0x008000000 11 #define PRINTK_NMI_CONTEXT_MASK 0xff0000000 12 13 #define PRINTK_NMI_CONTEXT_OFFSET 0x010000000 14 15 extern raw_spinlock_t logbuf_lock; 16 17 __printf(4, 0) 18 int vprintk_store(int facility, int level, 19 const struct dev_printk_info *dev_info, 20 const char *fmt, va_list args); 21 22 __printf(1, 0) int vprintk_default(const char *fmt, va_list args); 23 __printf(1, 0) int vprintk_deferred(const char *fmt, va_list args); 24 __printf(1, 0) int vprintk_func(const char *fmt, va_list args); 25 void __printk_safe_enter(void); 26 void __printk_safe_exit(void); 27 28 void printk_safe_init(void); 29 bool printk_percpu_data_ready(void); 30 31 #define printk_safe_enter_irqsave(flags) \ 32 do { \ 33 local_irq_save(flags); \ 34 __printk_safe_enter(); \ 35 } while (0) 36 37 #define printk_safe_exit_irqrestore(flags) \ 38 do { \ 39 __printk_safe_exit(); \ 40 local_irq_restore(flags); \ 41 } while (0) 42 43 #define printk_safe_enter_irq() \ 44 do { \ 45 local_irq_disable(); \ 46 __printk_safe_enter(); \ 47 } while (0) 48 49 #define printk_safe_exit_irq() \ 50 do { \ 51 __printk_safe_exit(); \ 52 local_irq_enable(); \ 53 } while (0) 54 55 void defer_console_output(void); 56 57 #else 58 59 __printf(1, 0) int vprintk_func(const char *fmt, va_list args) { return 0; } 60 61 /* 62 * In !PRINTK builds we still export logbuf_lock spin_lock, console_sem 63 * semaphore and some of console functions (console_unlock()/etc.), so 64 * printk-safe must preserve the existing local IRQ guarantees. 65 */ 66 #define printk_safe_enter_irqsave(flags) local_irq_save(flags) 67 #define printk_safe_exit_irqrestore(flags) local_irq_restore(flags) 68 69 #define printk_safe_enter_irq() local_irq_disable() 70 #define printk_safe_exit_irq() local_irq_enable() 71 72 static inline void printk_safe_init(void) { } 73 static inline bool printk_percpu_data_ready(void) { return false; } 74 #endif /* CONFIG_PRINTK */ 75