1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_MMIOTRACE_H 3 #define _LINUX_MMIOTRACE_H 4 5 #include <linux/types.h> 6 #include <linux/list.h> 7 8 struct kmmio_probe; 9 struct pt_regs; 10 11 typedef void (*kmmio_pre_handler_t)(struct kmmio_probe *, 12 struct pt_regs *, unsigned long addr); 13 typedef void (*kmmio_post_handler_t)(struct kmmio_probe *, 14 unsigned long condition, struct pt_regs *); 15 16 struct kmmio_probe { 17 /* kmmio internal list: */ 18 struct list_head list; 19 /* start location of the probe point: */ 20 unsigned long addr; 21 /* length of the probe region: */ 22 unsigned long len; 23 /* Called before addr is executed: */ 24 kmmio_pre_handler_t pre_handler; 25 /* Called after addr is executed: */ 26 kmmio_post_handler_t post_handler; 27 void *private; 28 }; 29 30 extern unsigned int kmmio_count; 31 32 extern int register_kmmio_probe(struct kmmio_probe *p); 33 extern void unregister_kmmio_probe(struct kmmio_probe *p); 34 extern int kmmio_init(void); 35 extern void kmmio_cleanup(void); 36 37 #ifdef CONFIG_MMIOTRACE 38 /* kmmio is active by some kmmio_probes? */ is_kmmio_active(void)39 static inline int is_kmmio_active(void) 40 { 41 return kmmio_count; 42 } 43 44 /* Called from page fault handler. */ 45 extern int kmmio_handler(struct pt_regs *regs, unsigned long addr); 46 47 /* Called from ioremap.c */ 48 extern void mmiotrace_ioremap(resource_size_t offset, unsigned long size, 49 void __iomem *addr); 50 extern void mmiotrace_iounmap(volatile void __iomem *addr); 51 52 /* For anyone to insert markers. Remember trailing newline. */ 53 extern __printf(1, 2) int mmiotrace_printk(const char *fmt, ...); 54 #else /* !CONFIG_MMIOTRACE: */ is_kmmio_active(void)55 static inline int is_kmmio_active(void) 56 { 57 return 0; 58 } 59 kmmio_handler(struct pt_regs * regs,unsigned long addr)60 static inline int kmmio_handler(struct pt_regs *regs, unsigned long addr) 61 { 62 return 0; 63 } 64 mmiotrace_ioremap(resource_size_t offset,unsigned long size,void __iomem * addr)65 static inline void mmiotrace_ioremap(resource_size_t offset, 66 unsigned long size, void __iomem *addr) 67 { 68 } 69 mmiotrace_iounmap(volatile void __iomem * addr)70 static inline void mmiotrace_iounmap(volatile void __iomem *addr) 71 { 72 } 73 mmiotrace_printk(const char * fmt,...)74 static inline __printf(1, 2) int mmiotrace_printk(const char *fmt, ...) 75 { 76 return 0; 77 } 78 #endif /* CONFIG_MMIOTRACE */ 79 80 enum mm_io_opcode { 81 MMIO_READ = 0x1, /* struct mmiotrace_rw */ 82 MMIO_WRITE = 0x2, /* struct mmiotrace_rw */ 83 MMIO_PROBE = 0x3, /* struct mmiotrace_map */ 84 MMIO_UNPROBE = 0x4, /* struct mmiotrace_map */ 85 MMIO_UNKNOWN_OP = 0x5, /* struct mmiotrace_rw */ 86 }; 87 88 struct mmiotrace_rw { 89 resource_size_t phys; /* PCI address of register */ 90 unsigned long value; 91 unsigned long pc; /* optional program counter */ 92 int map_id; 93 unsigned char opcode; /* one of MMIO_{READ,WRITE,UNKNOWN_OP} */ 94 unsigned char width; /* size of register access in bytes */ 95 }; 96 97 struct mmiotrace_map { 98 resource_size_t phys; /* base address in PCI space */ 99 unsigned long virt; /* base virtual address */ 100 unsigned long len; /* mapping size */ 101 int map_id; 102 unsigned char opcode; /* MMIO_PROBE or MMIO_UNPROBE */ 103 }; 104 105 /* in kernel/trace/trace_mmiotrace.c */ 106 extern void enable_mmiotrace(void); 107 extern void disable_mmiotrace(void); 108 extern void mmio_trace_rw(struct mmiotrace_rw *rw); 109 extern void mmio_trace_mapping(struct mmiotrace_map *map); 110 extern __printf(1, 0) int mmio_trace_printk(const char *fmt, va_list args); 111 112 #endif /* _LINUX_MMIOTRACE_H */ 113