Merge branch 'tip/perf/core-4' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace into perf/core
This commit is contained in:
Ingo Molnar
@@ -24,40 +24,21 @@
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#include <trace/syscall.h>
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#include <asm/cacheflush.h>
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#include <asm/kprobes.h>
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#include <asm/ftrace.h>
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#include <asm/nops.h>
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#include <asm/nmi.h>
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#ifdef CONFIG_DYNAMIC_FTRACE
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/*
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* modifying_code is set to notify NMIs that they need to use
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* memory barriers when entering or exiting. But we don't want
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* to burden NMIs with unnecessary memory barriers when code
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* modification is not being done (which is most of the time).
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*
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* A mutex is already held when ftrace_arch_code_modify_prepare
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* and post_process are called. No locks need to be taken here.
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*
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* Stop machine will make sure currently running NMIs are done
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* and new NMIs will see the updated variable before we need
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* to worry about NMIs doing memory barriers.
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*/
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static int modifying_code __read_mostly;
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static DEFINE_PER_CPU(int, save_modifying_code);
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int ftrace_arch_code_modify_prepare(void)
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{
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set_kernel_text_rw();
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set_all_modules_text_rw();
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modifying_code = 1;
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return 0;
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}
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int ftrace_arch_code_modify_post_process(void)
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{
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modifying_code = 0;
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set_all_modules_text_ro();
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set_kernel_text_ro();
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return 0;
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@@ -90,134 +71,6 @@ static unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr)
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return calc.code;
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}
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/*
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* Modifying code must take extra care. On an SMP machine, if
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* the code being modified is also being executed on another CPU
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* that CPU will have undefined results and possibly take a GPF.
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* We use kstop_machine to stop other CPUS from exectuing code.
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* But this does not stop NMIs from happening. We still need
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* to protect against that. We separate out the modification of
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* the code to take care of this.
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*
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* Two buffers are added: An IP buffer and a "code" buffer.
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*
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* 1) Put the instruction pointer into the IP buffer
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* and the new code into the "code" buffer.
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* 2) Wait for any running NMIs to finish and set a flag that says
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* we are modifying code, it is done in an atomic operation.
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* 3) Write the code
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* 4) clear the flag.
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* 5) Wait for any running NMIs to finish.
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*
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* If an NMI is executed, the first thing it does is to call
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* "ftrace_nmi_enter". This will check if the flag is set to write
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* and if it is, it will write what is in the IP and "code" buffers.
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*
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* The trick is, it does not matter if everyone is writing the same
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* content to the code location. Also, if a CPU is executing code
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* it is OK to write to that code location if the contents being written
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* are the same as what exists.
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*/
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#define MOD_CODE_WRITE_FLAG (1 << 31) /* set when NMI should do the write */
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static atomic_t nmi_running = ATOMIC_INIT(0);
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static int mod_code_status; /* holds return value of text write */
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static void *mod_code_ip; /* holds the IP to write to */
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static const void *mod_code_newcode; /* holds the text to write to the IP */
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static unsigned nmi_wait_count;
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static atomic_t nmi_update_count = ATOMIC_INIT(0);
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int ftrace_arch_read_dyn_info(char *buf, int size)
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{
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int r;
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r = snprintf(buf, size, "%u %u",
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nmi_wait_count,
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atomic_read(&nmi_update_count));
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return r;
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}
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static void clear_mod_flag(void)
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{
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int old = atomic_read(&nmi_running);
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for (;;) {
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int new = old & ~MOD_CODE_WRITE_FLAG;
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if (old == new)
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break;
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old = atomic_cmpxchg(&nmi_running, old, new);
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}
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}
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static void ftrace_mod_code(void)
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{
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/*
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* Yes, more than one CPU process can be writing to mod_code_status.
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* (and the code itself)
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* But if one were to fail, then they all should, and if one were
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* to succeed, then they all should.
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*/
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mod_code_status = probe_kernel_write(mod_code_ip, mod_code_newcode,
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MCOUNT_INSN_SIZE);
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/* if we fail, then kill any new writers */
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if (mod_code_status)
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clear_mod_flag();
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}
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void ftrace_nmi_enter(void)
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{
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__this_cpu_write(save_modifying_code, modifying_code);
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if (!__this_cpu_read(save_modifying_code))
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return;
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if (atomic_inc_return(&nmi_running) & MOD_CODE_WRITE_FLAG) {
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smp_rmb();
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ftrace_mod_code();
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atomic_inc(&nmi_update_count);
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}
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/* Must have previous changes seen before executions */
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smp_mb();
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}
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void ftrace_nmi_exit(void)
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{
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if (!__this_cpu_read(save_modifying_code))
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return;
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/* Finish all executions before clearing nmi_running */
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smp_mb();
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atomic_dec(&nmi_running);
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}
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static void wait_for_nmi_and_set_mod_flag(void)
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{
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if (!atomic_cmpxchg(&nmi_running, 0, MOD_CODE_WRITE_FLAG))
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return;
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do {
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cpu_relax();
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} while (atomic_cmpxchg(&nmi_running, 0, MOD_CODE_WRITE_FLAG));
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nmi_wait_count++;
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}
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static void wait_for_nmi(void)
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{
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if (!atomic_read(&nmi_running))
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return;
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do {
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cpu_relax();
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} while (atomic_read(&nmi_running));
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nmi_wait_count++;
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}
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static inline int
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within(unsigned long addr, unsigned long start, unsigned long end)
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{
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@@ -238,26 +91,7 @@ do_ftrace_mod_code(unsigned long ip, const void *new_code)
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if (within(ip, (unsigned long)_text, (unsigned long)_etext))
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ip = (unsigned long)__va(__pa(ip));
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mod_code_ip = (void *)ip;
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mod_code_newcode = new_code;
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/* The buffers need to be visible before we let NMIs write them */
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smp_mb();
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wait_for_nmi_and_set_mod_flag();
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/* Make sure all running NMIs have finished before we write the code */
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smp_mb();
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ftrace_mod_code();
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/* Make sure the write happens before clearing the bit */
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smp_mb();
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clear_mod_flag();
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wait_for_nmi();
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return mod_code_status;
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return probe_kernel_write((void *)ip, new_code, MCOUNT_INSN_SIZE);
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}
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static const unsigned char *ftrace_nop_replace(void)
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@@ -334,6 +168,347 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
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return ret;
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}
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int modifying_ftrace_code __read_mostly;
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/*
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* A breakpoint was added to the code address we are about to
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* modify, and this is the handle that will just skip over it.
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* We are either changing a nop into a trace call, or a trace
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* call to a nop. While the change is taking place, we treat
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* it just like it was a nop.
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*/
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int ftrace_int3_handler(struct pt_regs *regs)
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{
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if (WARN_ON_ONCE(!regs))
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return 0;
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if (!ftrace_location(regs->ip - 1))
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return 0;
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regs->ip += MCOUNT_INSN_SIZE - 1;
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return 1;
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}
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static int ftrace_write(unsigned long ip, const char *val, int size)
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{
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/*
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* On x86_64, kernel text mappings are mapped read-only with
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* CONFIG_DEBUG_RODATA. So we use the kernel identity mapping instead
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* of the kernel text mapping to modify the kernel text.
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*
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* For 32bit kernels, these mappings are same and we can use
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* kernel identity mapping to modify code.
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*/
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if (within(ip, (unsigned long)_text, (unsigned long)_etext))
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ip = (unsigned long)__va(__pa(ip));
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return probe_kernel_write((void *)ip, val, size);
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}
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static int add_break(unsigned long ip, const char *old)
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{
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unsigned char replaced[MCOUNT_INSN_SIZE];
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unsigned char brk = BREAKPOINT_INSTRUCTION;
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if (probe_kernel_read(replaced, (void *)ip, MCOUNT_INSN_SIZE))
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return -EFAULT;
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/* Make sure it is what we expect it to be */
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if (memcmp(replaced, old, MCOUNT_INSN_SIZE) != 0)
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return -EINVAL;
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if (ftrace_write(ip, &brk, 1))
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return -EPERM;
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return 0;
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}
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static int add_brk_on_call(struct dyn_ftrace *rec, unsigned long addr)
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{
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unsigned const char *old;
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unsigned long ip = rec->ip;
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old = ftrace_call_replace(ip, addr);
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return add_break(rec->ip, old);
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}
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static int add_brk_on_nop(struct dyn_ftrace *rec)
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{
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unsigned const char *old;
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old = ftrace_nop_replace();
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return add_break(rec->ip, old);
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}
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static int add_breakpoints(struct dyn_ftrace *rec, int enable)
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{
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unsigned long ftrace_addr;
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int ret;
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ret = ftrace_test_record(rec, enable);
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ftrace_addr = (unsigned long)FTRACE_ADDR;
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switch (ret) {
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case FTRACE_UPDATE_IGNORE:
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return 0;
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case FTRACE_UPDATE_MAKE_CALL:
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/* converting nop to call */
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return add_brk_on_nop(rec);
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case FTRACE_UPDATE_MAKE_NOP:
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/* converting a call to a nop */
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return add_brk_on_call(rec, ftrace_addr);
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}
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return 0;
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}
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/*
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* On error, we need to remove breakpoints. This needs to
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* be done caefully. If the address does not currently have a
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* breakpoint, we know we are done. Otherwise, we look at the
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* remaining 4 bytes of the instruction. If it matches a nop
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* we replace the breakpoint with the nop. Otherwise we replace
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* it with the call instruction.
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*/
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static int remove_breakpoint(struct dyn_ftrace *rec)
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{
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unsigned char ins[MCOUNT_INSN_SIZE];
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unsigned char brk = BREAKPOINT_INSTRUCTION;
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const unsigned char *nop;
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unsigned long ftrace_addr;
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unsigned long ip = rec->ip;
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||||
/* If we fail the read, just give up */
|
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if (probe_kernel_read(ins, (void *)ip, MCOUNT_INSN_SIZE))
|
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return -EFAULT;
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||||
|
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/* If this does not have a breakpoint, we are done */
|
||||
if (ins[0] != brk)
|
||||
return -1;
|
||||
|
||||
nop = ftrace_nop_replace();
|
||||
|
||||
/*
|
||||
* If the last 4 bytes of the instruction do not match
|
||||
* a nop, then we assume that this is a call to ftrace_addr.
|
||||
*/
|
||||
if (memcmp(&ins[1], &nop[1], MCOUNT_INSN_SIZE - 1) != 0) {
|
||||
/*
|
||||
* For extra paranoidism, we check if the breakpoint is on
|
||||
* a call that would actually jump to the ftrace_addr.
|
||||
* If not, don't touch the breakpoint, we make just create
|
||||
* a disaster.
|
||||
*/
|
||||
ftrace_addr = (unsigned long)FTRACE_ADDR;
|
||||
nop = ftrace_call_replace(ip, ftrace_addr);
|
||||
|
||||
if (memcmp(&ins[1], &nop[1], MCOUNT_INSN_SIZE - 1) != 0)
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return probe_kernel_write((void *)ip, &nop[0], 1);
|
||||
}
|
||||
|
||||
static int add_update_code(unsigned long ip, unsigned const char *new)
|
||||
{
|
||||
/* skip breakpoint */
|
||||
ip++;
|
||||
new++;
|
||||
if (ftrace_write(ip, new, MCOUNT_INSN_SIZE - 1))
|
||||
return -EPERM;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int add_update_call(struct dyn_ftrace *rec, unsigned long addr)
|
||||
{
|
||||
unsigned long ip = rec->ip;
|
||||
unsigned const char *new;
|
||||
|
||||
new = ftrace_call_replace(ip, addr);
|
||||
return add_update_code(ip, new);
|
||||
}
|
||||
|
||||
static int add_update_nop(struct dyn_ftrace *rec)
|
||||
{
|
||||
unsigned long ip = rec->ip;
|
||||
unsigned const char *new;
|
||||
|
||||
new = ftrace_nop_replace();
|
||||
return add_update_code(ip, new);
|
||||
}
|
||||
|
||||
static int add_update(struct dyn_ftrace *rec, int enable)
|
||||
{
|
||||
unsigned long ftrace_addr;
|
||||
int ret;
|
||||
|
||||
ret = ftrace_test_record(rec, enable);
|
||||
|
||||
ftrace_addr = (unsigned long)FTRACE_ADDR;
|
||||
|
||||
switch (ret) {
|
||||
case FTRACE_UPDATE_IGNORE:
|
||||
return 0;
|
||||
|
||||
case FTRACE_UPDATE_MAKE_CALL:
|
||||
/* converting nop to call */
|
||||
return add_update_call(rec, ftrace_addr);
|
||||
|
||||
case FTRACE_UPDATE_MAKE_NOP:
|
||||
/* converting a call to a nop */
|
||||
return add_update_nop(rec);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int finish_update_call(struct dyn_ftrace *rec, unsigned long addr)
|
||||
{
|
||||
unsigned long ip = rec->ip;
|
||||
unsigned const char *new;
|
||||
|
||||
new = ftrace_call_replace(ip, addr);
|
||||
|
||||
if (ftrace_write(ip, new, 1))
|
||||
return -EPERM;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int finish_update_nop(struct dyn_ftrace *rec)
|
||||
{
|
||||
unsigned long ip = rec->ip;
|
||||
unsigned const char *new;
|
||||
|
||||
new = ftrace_nop_replace();
|
||||
|
||||
if (ftrace_write(ip, new, 1))
|
||||
return -EPERM;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int finish_update(struct dyn_ftrace *rec, int enable)
|
||||
{
|
||||
unsigned long ftrace_addr;
|
||||
int ret;
|
||||
|
||||
ret = ftrace_update_record(rec, enable);
|
||||
|
||||
ftrace_addr = (unsigned long)FTRACE_ADDR;
|
||||
|
||||
switch (ret) {
|
||||
case FTRACE_UPDATE_IGNORE:
|
||||
return 0;
|
||||
|
||||
case FTRACE_UPDATE_MAKE_CALL:
|
||||
/* converting nop to call */
|
||||
return finish_update_call(rec, ftrace_addr);
|
||||
|
||||
case FTRACE_UPDATE_MAKE_NOP:
|
||||
/* converting a call to a nop */
|
||||
return finish_update_nop(rec);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void do_sync_core(void *data)
|
||||
{
|
||||
sync_core();
|
||||
}
|
||||
|
||||
static void run_sync(void)
|
||||
{
|
||||
int enable_irqs = irqs_disabled();
|
||||
|
||||
/* We may be called with interrupts disbled (on bootup). */
|
||||
if (enable_irqs)
|
||||
local_irq_enable();
|
||||
on_each_cpu(do_sync_core, NULL, 1);
|
||||
if (enable_irqs)
|
||||
local_irq_disable();
|
||||
}
|
||||
|
||||
static void ftrace_replace_code(int enable)
|
||||
{
|
||||
struct ftrace_rec_iter *iter;
|
||||
struct dyn_ftrace *rec;
|
||||
const char *report = "adding breakpoints";
|
||||
int count = 0;
|
||||
int ret;
|
||||
|
||||
for_ftrace_rec_iter(iter) {
|
||||
rec = ftrace_rec_iter_record(iter);
|
||||
|
||||
ret = add_breakpoints(rec, enable);
|
||||
if (ret)
|
||||
goto remove_breakpoints;
|
||||
count++;
|
||||
}
|
||||
|
||||
run_sync();
|
||||
|
||||
report = "updating code";
|
||||
|
||||
for_ftrace_rec_iter(iter) {
|
||||
rec = ftrace_rec_iter_record(iter);
|
||||
|
||||
ret = add_update(rec, enable);
|
||||
if (ret)
|
||||
goto remove_breakpoints;
|
||||
}
|
||||
|
||||
run_sync();
|
||||
|
||||
report = "removing breakpoints";
|
||||
|
||||
for_ftrace_rec_iter(iter) {
|
||||
rec = ftrace_rec_iter_record(iter);
|
||||
|
||||
ret = finish_update(rec, enable);
|
||||
if (ret)
|
||||
goto remove_breakpoints;
|
||||
}
|
||||
|
||||
run_sync();
|
||||
|
||||
return;
|
||||
|
||||
remove_breakpoints:
|
||||
ftrace_bug(ret, rec ? rec->ip : 0);
|
||||
printk(KERN_WARNING "Failed on %s (%d):\n", report, count);
|
||||
for_ftrace_rec_iter(iter) {
|
||||
rec = ftrace_rec_iter_record(iter);
|
||||
remove_breakpoint(rec);
|
||||
}
|
||||
}
|
||||
|
||||
void arch_ftrace_update_code(int command)
|
||||
{
|
||||
modifying_ftrace_code++;
|
||||
|
||||
if (command & FTRACE_UPDATE_CALLS)
|
||||
ftrace_replace_code(1);
|
||||
else if (command & FTRACE_DISABLE_CALLS)
|
||||
ftrace_replace_code(0);
|
||||
|
||||
if (command & FTRACE_UPDATE_TRACE_FUNC)
|
||||
ftrace_update_ftrace_func(ftrace_trace_function);
|
||||
|
||||
if (command & FTRACE_START_FUNC_RET)
|
||||
ftrace_enable_ftrace_graph_caller();
|
||||
else if (command & FTRACE_STOP_FUNC_RET)
|
||||
ftrace_disable_ftrace_graph_caller();
|
||||
|
||||
modifying_ftrace_code--;
|
||||
}
|
||||
|
||||
int __init ftrace_dyn_arch_init(void *data)
|
||||
{
|
||||
/* The return code is retured via data */
|
||||
|
||||
@@ -84,7 +84,7 @@ __setup("unknown_nmi_panic", setup_unknown_nmi_panic);
|
||||
|
||||
#define nmi_to_desc(type) (&nmi_desc[type])
|
||||
|
||||
static int notrace __kprobes nmi_handle(unsigned int type, struct pt_regs *regs, bool b2b)
|
||||
static int __kprobes nmi_handle(unsigned int type, struct pt_regs *regs, bool b2b)
|
||||
{
|
||||
struct nmi_desc *desc = nmi_to_desc(type);
|
||||
struct nmiaction *a;
|
||||
@@ -209,7 +209,7 @@ void unregister_nmi_handler(unsigned int type, const char *name)
|
||||
|
||||
EXPORT_SYMBOL_GPL(unregister_nmi_handler);
|
||||
|
||||
static notrace __kprobes void
|
||||
static __kprobes void
|
||||
pci_serr_error(unsigned char reason, struct pt_regs *regs)
|
||||
{
|
||||
pr_emerg("NMI: PCI system error (SERR) for reason %02x on CPU %d.\n",
|
||||
@@ -236,7 +236,7 @@ pci_serr_error(unsigned char reason, struct pt_regs *regs)
|
||||
outb(reason, NMI_REASON_PORT);
|
||||
}
|
||||
|
||||
static notrace __kprobes void
|
||||
static __kprobes void
|
||||
io_check_error(unsigned char reason, struct pt_regs *regs)
|
||||
{
|
||||
unsigned long i;
|
||||
@@ -263,7 +263,7 @@ io_check_error(unsigned char reason, struct pt_regs *regs)
|
||||
outb(reason, NMI_REASON_PORT);
|
||||
}
|
||||
|
||||
static notrace __kprobes void
|
||||
static __kprobes void
|
||||
unknown_nmi_error(unsigned char reason, struct pt_regs *regs)
|
||||
{
|
||||
int handled;
|
||||
@@ -305,7 +305,7 @@ unknown_nmi_error(unsigned char reason, struct pt_regs *regs)
|
||||
static DEFINE_PER_CPU(bool, swallow_nmi);
|
||||
static DEFINE_PER_CPU(unsigned long, last_nmi_rip);
|
||||
|
||||
static notrace __kprobes void default_do_nmi(struct pt_regs *regs)
|
||||
static __kprobes void default_do_nmi(struct pt_regs *regs)
|
||||
{
|
||||
unsigned char reason = 0;
|
||||
int handled;
|
||||
|
||||
@@ -50,6 +50,7 @@
|
||||
#include <asm/processor.h>
|
||||
#include <asm/debugreg.h>
|
||||
#include <linux/atomic.h>
|
||||
#include <asm/ftrace.h>
|
||||
#include <asm/traps.h>
|
||||
#include <asm/desc.h>
|
||||
#include <asm/i387.h>
|
||||
@@ -303,8 +304,13 @@ gp_in_kernel:
|
||||
}
|
||||
|
||||
/* May run on IST stack. */
|
||||
dotraplinkage void __kprobes do_int3(struct pt_regs *regs, long error_code)
|
||||
dotraplinkage void __kprobes notrace do_int3(struct pt_regs *regs, long error_code)
|
||||
{
|
||||
#ifdef CONFIG_DYNAMIC_FTRACE
|
||||
/* ftrace must be first, everything else may cause a recursive crash */
|
||||
if (unlikely(modifying_ftrace_code) && ftrace_int3_handler(regs))
|
||||
return;
|
||||
#endif
|
||||
#ifdef CONFIG_KGDB_LOW_LEVEL_TRAP
|
||||
if (kgdb_ll_trap(DIE_INT3, "int3", regs, error_code, X86_TRAP_BP,
|
||||
SIGTRAP) == NOTIFY_STOP)
|
||||
|
||||
Reference in New Issue
Block a user