1 #ifndef MMIOTRACE_H 2 #define 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 struct list_head list; /* kmmio internal list */ 17 unsigned long addr; /* start location of the probe point */ 18 unsigned long len; /* length of the probe region */ 19 kmmio_pre_handler_t pre_handler; /* Called before addr is executed. */ 20 kmmio_post_handler_t post_handler; /* Called after addr is executed */ 21 void *private; 22 }; 23 24 /* kmmio is active by some kmmio_probes? */ 25 static inline int is_kmmio_active(void) 26 { 27 extern unsigned int kmmio_count; 28 return kmmio_count; 29 } 30 31 extern int register_kmmio_probe(struct kmmio_probe *p); 32 extern void unregister_kmmio_probe(struct kmmio_probe *p); 33 34 /* Called from page fault handler. */ 35 extern int kmmio_handler(struct pt_regs *regs, unsigned long addr); 36 37 /* Called from ioremap.c */ 38 #ifdef CONFIG_MMIOTRACE 39 extern void mmiotrace_ioremap(resource_size_t offset, unsigned long size, 40 void __iomem *addr); 41 extern void mmiotrace_iounmap(volatile void __iomem *addr); 42 #else 43 static inline void mmiotrace_ioremap(resource_size_t offset, 44 unsigned long size, void __iomem *addr) 45 { 46 } 47 48 static inline void mmiotrace_iounmap(volatile void __iomem *addr) 49 { 50 } 51 #endif /* CONFIG_MMIOTRACE_HOOKS */ 52 53 enum mm_io_opcode { 54 MMIO_READ = 0x1, /* struct mmiotrace_rw */ 55 MMIO_WRITE = 0x2, /* struct mmiotrace_rw */ 56 MMIO_PROBE = 0x3, /* struct mmiotrace_map */ 57 MMIO_UNPROBE = 0x4, /* struct mmiotrace_map */ 58 MMIO_MARKER = 0x5, /* raw char data */ 59 MMIO_UNKNOWN_OP = 0x6, /* struct mmiotrace_rw */ 60 }; 61 62 struct mmiotrace_rw { 63 resource_size_t phys; /* PCI address of register */ 64 unsigned long value; 65 unsigned long pc; /* optional program counter */ 66 int map_id; 67 unsigned char opcode; /* one of MMIO_{READ,WRITE,UNKNOWN_OP} */ 68 unsigned char width; /* size of register access in bytes */ 69 }; 70 71 struct mmiotrace_map { 72 resource_size_t phys; /* base address in PCI space */ 73 unsigned long virt; /* base virtual address */ 74 unsigned long len; /* mapping size */ 75 int map_id; 76 unsigned char opcode; /* MMIO_PROBE or MMIO_UNPROBE */ 77 }; 78 79 /* in kernel/trace/trace_mmiotrace.c */ 80 extern void enable_mmiotrace(void); 81 extern void disable_mmiotrace(void); 82 extern void mmio_trace_rw(struct mmiotrace_rw *rw); 83 extern void mmio_trace_mapping(struct mmiotrace_map *map); 84 85 #endif /* MMIOTRACE_H */ 86