f984b51e07
On Sat, 22 Mar 2008 13:07:47 +0100 Ingo Molnar <mingo@elte.hu> wrote: > > > i'd suggest the following: pull x86.git and sched-devel.git into a > > > single tree [the two will combine without rejects]. Then try to add a > > > kernel/tracing/trace_mmiotrace.c ftrace plugin. The trace_sysprof.c > > > plugin might be a good example. > > > > I did this and now I have mmiotrace enabled/disabled via the tracing > > framework (what do we call this, since ftrace is one of the tracers?). > > cool! could you send the patches for that? (even if they are not fully > functional yet) Patch attached in the end. Nice to see how much code disappeared. I tried to mark all the features I had to break with XXX-comments. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
127 lines
3.3 KiB
C
127 lines
3.3 KiB
C
#ifndef MMIOTRACE_H
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#define MMIOTRACE_H
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#include <asm/types.h>
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#ifdef __KERNEL__
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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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struct list_head list; /* kmmio internal list */
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unsigned long addr; /* start location of the probe point */
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unsigned long len; /* length of the probe region */
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kmmio_pre_handler_t pre_handler; /* Called before addr is executed. */
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kmmio_post_handler_t post_handler; /* Called after addr is executed */
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void *user_data;
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};
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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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extern unsigned int kmmio_count;
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return kmmio_count;
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}
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extern void reference_kmmio(void);
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extern void unreference_kmmio(void);
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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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/* 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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#ifdef CONFIG_MMIOTRACE
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extern void
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mmiotrace_ioremap(unsigned long offset, unsigned long size, void __iomem *addr);
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extern void mmiotrace_iounmap(volatile void __iomem *addr);
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#else
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static inline void
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mmiotrace_ioremap(unsigned long offset, 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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#endif /* CONFIG_MMIOTRACE_HOOKS */
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/* in kernel/trace/trace_mmiotrace.c */
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extern int __init init_mmiotrace(void);
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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_record(u32 type, unsigned long addr, unsigned long arg);
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#endif /* __KERNEL__ */
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/*
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* If you change anything here, you must bump MMIO_VERSION.
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* This is the relay data format for user space.
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*/
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#define MMIO_VERSION 0x04
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/* mm_io_header.type */
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#define MMIO_OPCODE_MASK 0xff
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#define MMIO_OPCODE_SHIFT 0
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#define MMIO_WIDTH_MASK 0xff00
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#define MMIO_WIDTH_SHIFT 8
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#define MMIO_MAGIC (0x6f000000 | (MMIO_VERSION<<16))
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#define MMIO_MAGIC_MASK 0xffff0000
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enum mm_io_opcode { /* payload type: */
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MMIO_READ = 0x1, /* struct mm_io_rw */
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MMIO_WRITE = 0x2, /* struct mm_io_rw */
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MMIO_PROBE = 0x3, /* struct mm_io_map */
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MMIO_UNPROBE = 0x4, /* struct mm_io_map */
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MMIO_MARKER = 0x5, /* raw char data */
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MMIO_UNKNOWN_OP = 0x6, /* struct mm_io_rw */
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};
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struct mm_io_header {
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__u32 type; /* see MMIO_* macros above */
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__u32 sec; /* timestamp */
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__u32 nsec;
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__u32 pid; /* PID of the process, or 0 for kernel core */
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__u16 data_len; /* length of the following payload */
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};
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struct mm_io_rw {
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__u64 address; /* virtual address of register */
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__u64 value;
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__u64 pc; /* optional program counter */
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};
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struct mm_io_map {
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__u64 phys; /* base address in PCI space */
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__u64 addr; /* base virtual address */
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__u64 len; /* mapping size */
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__u64 pc; /* optional program counter */
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};
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/*
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* These structures are used to allow a single relay_write()
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* call to write a full packet.
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*/
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struct mm_io_header_rw {
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struct mm_io_header header;
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struct mm_io_rw rw;
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} __attribute__((packed));
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struct mm_io_header_map {
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struct mm_io_header header;
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struct mm_io_map map;
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} __attribute__((packed));
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#endif /* MMIOTRACE_H */
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