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 extern int kmmio_init(void); 34 extern void kmmio_cleanup(void); 35 36 #ifdef CONFIG_MMIOTRACE 37 /* kmmio is active by some kmmio_probes? */ 38 static inline int is_kmmio_active(void) 39 { 40 return kmmio_count; 41 } 42 43 /* Called from page fault handler. */ 44 extern int kmmio_handler(struct pt_regs *regs, unsigned long addr); 45 46 /* Called from ioremap.c */ 47 extern void mmiotrace_ioremap(resource_size_t offset, unsigned long size, 48 void __iomem *addr); 49 extern void mmiotrace_iounmap(volatile void __iomem *addr); 50 51 /* For anyone to insert markers. Remember trailing newline. */ 52 extern __printf(1, 2) int mmiotrace_printk(const char *fmt, ...); 53 #else /* !CONFIG_MMIOTRACE: */ 54 static inline int is_kmmio_active(void) 55 { 56 return 0; 57 } 58 59 static inline int kmmio_handler(struct pt_regs *regs, unsigned long addr) 60 { 61 return 0; 62 } 63 64 static inline void mmiotrace_ioremap(resource_size_t offset, 65 unsigned long size, void __iomem *addr) 66 { 67 } 68 69 static inline void mmiotrace_iounmap(volatile void __iomem *addr) 70 { 71 } 72 73 static inline __printf(1, 2) int mmiotrace_printk(const char *fmt, ...) 74 { 75 return 0; 76 } 77 #endif /* CONFIG_MMIOTRACE */ 78 79 enum mm_io_opcode { 80 MMIO_READ = 0x1, /* struct mmiotrace_rw */ 81 MMIO_WRITE = 0x2, /* struct mmiotrace_rw */ 82 MMIO_PROBE = 0x3, /* struct mmiotrace_map */ 83 MMIO_UNPROBE = 0x4, /* struct mmiotrace_map */ 84 MMIO_UNKNOWN_OP = 0x5, /* struct mmiotrace_rw */ 85 }; 86 87 struct mmiotrace_rw { 88 resource_size_t phys; /* PCI address of register */ 89 unsigned long value; 90 unsigned long pc; /* optional program counter */ 91 int map_id; 92 unsigned char opcode; /* one of MMIO_{READ,WRITE,UNKNOWN_OP} */ 93 unsigned char width; /* size of register access in bytes */ 94 }; 95 96 struct mmiotrace_map { 97 resource_size_t phys; /* base address in PCI space */ 98 unsigned long virt; /* base virtual address */ 99 unsigned long len; /* mapping size */ 100 int map_id; 101 unsigned char opcode; /* MMIO_PROBE or MMIO_UNPROBE */ 102 }; 103 104 /* in kernel/trace/trace_mmiotrace.c */ 105 extern void enable_mmiotrace(void); 106 extern void disable_mmiotrace(void); 107 extern void mmio_trace_rw(struct mmiotrace_rw *rw); 108 extern void mmio_trace_mapping(struct mmiotrace_map *map); 109 extern __printf(1, 0) int mmio_trace_printk(const char *fmt, va_list args); 110 111 #endif /* _LINUX_MMIOTRACE_H */ 112