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kmmio.c handles the list of mmio probes with callbacks, list of traced pages, and attaching into the page fault handler and die notifier. It arms, traps and disarms the given pages, this is the core of mmiotrace. mmio-mod.c is a user interface, hooking into ioremap functions and registering the mmio probes. It also decodes the required information from trapped mmio accesses via the pre and post callbacks in each probe. Currently, hooking into ioremap functions works by redefining the symbols of the target (binary) kernel module, so that it calls the traced versions of the functions. The most notable changes done since the last discussion are: - kmmio.c is a built-in, not part of the module - direct call from fault.c to kmmio.c, removing all dynamic hooks - prepare for unregistering probes at any time - make kmmio re-initializable and accessible to more than one user - rewrite kmmio locking to remove all spinlocks from page fault path Can I abuse call_rcu() like I do in kmmio.c:unregister_kmmio_probe() or is there a better way? The function called via call_rcu() itself calls call_rcu() again, will this work or break? There I need a second grace period for RCU after the first grace period for page faults. Mmiotrace itself (mmio-mod.c) is still a module, I am going to attack that next. At some point I will start looking into how to make mmiotrace a tracer component of ftrace (thanks for the hint, Ingo). Ftrace should make the user space part of mmiotracing as simple as 'cat /debug/trace/mmio > dump.txt'. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
39 lines
943 B
C
39 lines
943 B
C
#ifndef _ASM_X86_KDEBUG_H
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#define _ASM_X86_KDEBUG_H
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#include <linux/notifier.h>
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struct pt_regs;
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/* Grossly misnamed. */
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enum die_val {
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DIE_OOPS = 1,
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DIE_INT3,
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DIE_DEBUG,
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DIE_PANIC,
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DIE_NMI,
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DIE_DIE,
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DIE_NMIWATCHDOG,
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DIE_KERNELDEBUG,
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DIE_TRAP,
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DIE_GPF,
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DIE_CALL,
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DIE_NMI_IPI,
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DIE_PAGE_FAULT,
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DIE_NMIUNKNOWN,
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};
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extern void printk_address(unsigned long address, int reliable);
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extern void die(const char *, struct pt_regs *,long);
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extern int __must_check __die(const char *, struct pt_regs *, long);
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extern void show_registers(struct pt_regs *regs);
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extern void __show_registers(struct pt_regs *, int all);
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extern void show_trace(struct task_struct *t, struct pt_regs *regs,
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unsigned long *sp, unsigned long bp);
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extern void __show_regs(struct pt_regs *regs);
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extern void show_regs(struct pt_regs *regs);
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extern unsigned long oops_begin(void);
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extern void oops_end(unsigned long, struct pt_regs *, int signr);
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#endif
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