kernel/printk/internal.h

   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 */