1 #ifndef _LINUX_MMIOTRACE_H 2 #define _LINUX_MMIOTRACE_H 3 4 #include <linux/types.h> 5 #include <linux/list.h> 6 7 struct kmmio_probe; 8 struct pt_regs; 9 10 typedef void (*kmmio_pre_handler_t)(struct kmmio_probe *, 11 struct pt_regs *, unsigned long addr); 12 typedef void (*kmmio_post_handler_t)(struct kmmio_probe *, 13 unsigned long condition, struct pt_regs *); 14 15 struct kmmio_probe { 16 /* kmmio internal list: */ 17 struct list_head list; 18 /* start location of the probe point: */ 19 unsigned long addr; 20 /* length of the probe region: */ 21 unsigned long len; 22 /* Called before addr is executed: */ 23 kmmio_pre_handler_t pre_handler; 24 /* Called after addr is executed: */ 25 kmmio_post_handler_t post_handler; 26 void *private; 27 }; 28 29 extern unsigned int kmmio_count; 30 31 extern int register_kmmio_probe(struct kmmio_probe *p); 32 extern void unregister_kmmio_probe(struct kmmio_probe *p); 33 34 #ifdef CONFIG_MMIOTRACE 35 /* kmmio is active by some kmmio_probes? */ 36 static inline int is_kmmio_active(void) 37 { 38 return kmmio_count; 39 } 40 41 /* Called from page fault handler. */ 42 extern int kmmio_handler(struct pt_regs *regs, unsigned long addr); 43 44 /* Called from ioremap.c */ 45 extern void mmiotrace_ioremap(resource_size_t offset, unsigned long size, 46 void __iomem *addr); 47 extern void mmiotrace_iounmap(volatile void __iomem *addr); 48 49 /* For anyone to insert markers. Remember trailing newline. */ 50 extern int mmiotrace_printk(const char *fmt, ...) 51 __attribute__ ((format (printf, 1, 2))); 52 #else /* !CONFIG_MMIOTRACE: */ 53 static inline int is_kmmio_active(void) 54 { 55 return 0; 56 } 57 58 static inline int kmmio_handler(struct pt_regs *regs, unsigned long addr) 59 { 60 return 0; 61 } 62 63 static inline void mmiotrace_ioremap(resource_size_t offset, 64 unsigned long size, void __iomem *addr) 65 { 66 } 67 68 static inline void mmiotrace_iounmap(volatile void __iomem *addr) 69 { 70 } 71 72 static inline int mmiotrace_printk(const char *fmt, ...) 73 __attribute__ ((format (printf, 1, 0))); 74 75 static inline int mmiotrace_printk(const char *fmt, ...) 76 { 77 return 0; 78 } 79 #endif /* CONFIG_MMIOTRACE */ 80 81 enum mm_io_opcode { 82 MMIO_READ = 0x1, /* struct mmiotrace_rw */ 83 MMIO_WRITE = 0x2, /* struct mmiotrace_rw */ 84 MMIO_PROBE = 0x3, /* struct mmiotrace_map */ 85 MMIO_UNPROBE = 0x4, /* struct mmiotrace_map */ 86 MMIO_UNKNOWN_OP = 0x5, /* struct mmiotrace_rw */ 87 }; 88 89 struct mmiotrace_rw { 90 resource_size_t phys; /* PCI address of register */ 91 unsigned long value; 92 unsigned long pc; /* optional program counter */ 93 int map_id; 94 unsigned char opcode; /* one of MMIO_{READ,WRITE,UNKNOWN_OP} */ 95 unsigned char width; /* size of register access in bytes */ 96 }; 97 98 struct mmiotrace_map { 99 resource_size_t phys; /* base address in PCI space */ 100 unsigned long virt; /* base virtual address */ 101 unsigned long len; /* mapping size */ 102 int map_id; 103 unsigned char opcode; /* MMIO_PROBE or MMIO_UNPROBE */ 104 }; 105 106 /* in kernel/trace/trace_mmiotrace.c */ 107 extern void enable_mmiotrace(void); 108 extern void disable_mmiotrace(void); 109 extern void mmio_trace_rw(struct mmiotrace_rw *rw); 110 extern void mmio_trace_mapping(struct mmiotrace_map *map); 111 extern int mmio_trace_printk(const char *fmt, va_list args); 112 113 #endif /* _LINUX_MMIOTRACE_H */ 114