mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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b814d41f09
Impact: cleanup Remove an #ifdef from kmmio_fault() - we can do this by providing default implementations for is_kmmio_active() and kmmio_handler(). The compiler optimizes it all away in the !CONFIG_MMIOTRACE case. Also, while at it, clean up mmiotrace.h a bit: - standard header guards - standard vertical spaces for structure definitions No code changed (both with mmiotrace on and off in the config): text data bss dec hex filename 2947 12 12 2971 b9b fault.o.before 2947 12 12 2971 b9b fault.o.after Cc: Pekka Paalanen <pq@iki.fi> Cc: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
114 lines
3.0 KiB
C
114 lines
3.0 KiB
C
#ifndef _LINUX_MMIOTRACE_H
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#define _LINUX_MMIOTRACE_H
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#include <linux/types.h>
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#include <linux/list.h>
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struct kmmio_probe;
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struct pt_regs;
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typedef void (*kmmio_pre_handler_t)(struct kmmio_probe *,
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struct pt_regs *, unsigned long addr);
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typedef void (*kmmio_post_handler_t)(struct kmmio_probe *,
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unsigned long condition, struct pt_regs *);
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struct kmmio_probe {
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/* kmmio internal list: */
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struct list_head list;
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/* start location of the probe point: */
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unsigned long addr;
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/* length of the probe region: */
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unsigned long len;
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/* Called before addr is executed: */
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kmmio_pre_handler_t pre_handler;
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/* Called after addr is executed: */
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kmmio_post_handler_t post_handler;
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void *private;
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};
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extern unsigned int kmmio_count;
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extern int register_kmmio_probe(struct kmmio_probe *p);
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extern void unregister_kmmio_probe(struct kmmio_probe *p);
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#ifdef CONFIG_MMIOTRACE
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/* kmmio is active by some kmmio_probes? */
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static inline int is_kmmio_active(void)
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{
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return kmmio_count;
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}
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/* Called from page fault handler. */
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extern int kmmio_handler(struct pt_regs *regs, unsigned long addr);
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/* Called from ioremap.c */
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extern void mmiotrace_ioremap(resource_size_t offset, unsigned long size,
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void __iomem *addr);
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extern void mmiotrace_iounmap(volatile void __iomem *addr);
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/* For anyone to insert markers. Remember trailing newline. */
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extern int mmiotrace_printk(const char *fmt, ...)
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__attribute__ ((format (printf, 1, 2)));
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#else /* !CONFIG_MMIOTRACE: */
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static inline int is_kmmio_active(void)
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{
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return 0;
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}
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static inline int kmmio_handler(struct pt_regs *regs, unsigned long addr)
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{
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return 0;
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}
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static inline void mmiotrace_ioremap(resource_size_t offset,
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unsigned long size, void __iomem *addr)
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{
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}
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static inline void mmiotrace_iounmap(volatile void __iomem *addr)
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{
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}
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static inline int mmiotrace_printk(const char *fmt, ...)
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__attribute__ ((format (printf, 1, 0)));
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static inline int mmiotrace_printk(const char *fmt, ...)
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{
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return 0;
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}
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#endif /* CONFIG_MMIOTRACE */
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enum mm_io_opcode {
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MMIO_READ = 0x1, /* struct mmiotrace_rw */
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MMIO_WRITE = 0x2, /* struct mmiotrace_rw */
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MMIO_PROBE = 0x3, /* struct mmiotrace_map */
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MMIO_UNPROBE = 0x4, /* struct mmiotrace_map */
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MMIO_UNKNOWN_OP = 0x5, /* struct mmiotrace_rw */
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};
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struct mmiotrace_rw {
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resource_size_t phys; /* PCI address of register */
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unsigned long value;
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unsigned long pc; /* optional program counter */
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int map_id;
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unsigned char opcode; /* one of MMIO_{READ,WRITE,UNKNOWN_OP} */
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unsigned char width; /* size of register access in bytes */
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};
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struct mmiotrace_map {
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resource_size_t phys; /* base address in PCI space */
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unsigned long virt; /* base virtual address */
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unsigned long len; /* mapping size */
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int map_id;
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unsigned char opcode; /* MMIO_PROBE or MMIO_UNPROBE */
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};
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/* in kernel/trace/trace_mmiotrace.c */
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extern void enable_mmiotrace(void);
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extern void disable_mmiotrace(void);
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extern void mmio_trace_rw(struct mmiotrace_rw *rw);
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extern void mmio_trace_mapping(struct mmiotrace_map *map);
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extern int mmio_trace_printk(const char *fmt, va_list args);
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#endif /* _LINUX_MMIOTRACE_H */
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