From 432039933a16b8227b7b267f46ac1c1b9b3adf14 Mon Sep 17 00:00:00 2001 From: "K.Prasad" Date: Mon, 1 Jun 2009 23:46:20 +0530 Subject: hw-breakpoints: sample HW breakpoint over kernel data address This patch introduces a sample kernel module to demonstrate the use of Hardware Breakpoint feature. It places a breakpoint over the kernel variable 'pid_max' to monitor all write operations and emits a function-backtrace when done. Signed-off-by: K.Prasad Signed-off-by: Frederic Weisbecker --- samples/hw_breakpoint/data_breakpoint.c | 83 +++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) create mode 100644 samples/hw_breakpoint/data_breakpoint.c (limited to 'samples/hw_breakpoint/data_breakpoint.c') diff --git a/samples/hw_breakpoint/data_breakpoint.c b/samples/hw_breakpoint/data_breakpoint.c new file mode 100644 index 00000000000..9cbdbb871b7 --- /dev/null +++ b/samples/hw_breakpoint/data_breakpoint.c @@ -0,0 +1,83 @@ +/* + * data_breakpoint.c - Sample HW Breakpoint file to watch kernel data address + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * usage: insmod data_breakpoint.ko ksym= + * + * This file is a kernel module that places a breakpoint over ksym_name kernel + * variable using Hardware Breakpoint register. The corresponding handler which + * prints a backtrace is invoked everytime a write operation is performed on + * that variable. + * + * Copyright (C) IBM Corporation, 2009 + */ +#include /* Needed by all modules */ +#include /* Needed for KERN_INFO */ +#include /* Needed for the macros */ + +#include + +struct hw_breakpoint sample_hbp; + +static char ksym_name[KSYM_NAME_LEN] = "pid_max"; +module_param_string(ksym, ksym_name, KSYM_NAME_LEN, S_IRUGO); +MODULE_PARM_DESC(ksym, "Kernel symbol to monitor; this module will report any" + " write operations on the kernel symbol"); + +void sample_hbp_handler(struct hw_breakpoint *temp, struct pt_regs + *temp_regs) +{ + printk(KERN_INFO "%s value is changed\n", ksym_name); + dump_stack(); + printk(KERN_INFO "Dump stack from sample_hbp_handler\n"); +} + +static int __init hw_break_module_init(void) +{ + int ret; + +#ifdef CONFIG_X86 + sample_hbp.info.name = ksym_name; + sample_hbp.info.type = HW_BREAKPOINT_WRITE; + sample_hbp.info.len = HW_BREAKPOINT_LEN_4; +#endif /* CONFIG_X86 */ + + sample_hbp.triggered = (void *)sample_hbp_handler; + + ret = register_kernel_hw_breakpoint(&sample_hbp); + + if (ret < 0) { + printk(KERN_INFO "Breakpoint registration failed\n"); + return ret; + } else + printk(KERN_INFO "HW Breakpoint for %s write installed\n", + ksym_name); + + return 0; +} + +static void __exit hw_break_module_exit(void) +{ + unregister_kernel_hw_breakpoint(&sample_hbp); + printk(KERN_INFO "HW Breakpoint for %s write uninstalled\n", ksym_name); +} + +module_init(hw_break_module_init); +module_exit(hw_break_module_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("K.Prasad"); +MODULE_DESCRIPTION("ksym breakpoint"); -- cgit v1.2.3-70-g09d2 From f60d24d2ad04977b0bd9e3eb35dba2d2fa569af9 Mon Sep 17 00:00:00 2001 From: Frederic Weisbecker Date: Tue, 10 Nov 2009 10:17:07 +0100 Subject: hw-breakpoints: Fix broken hw-breakpoint sample module The hw-breakpoint sample module has been broken during the hw-breakpoint internals refactoring. Propagate the changes to it. Reported-by: "K. Prasad" Signed-off-by: Frederic Weisbecker --- kernel/hw_breakpoint.c | 3 ++- kernel/kallsyms.c | 1 + samples/hw_breakpoint/data_breakpoint.c | 43 ++++++++++++++++++--------------- 3 files changed, 27 insertions(+), 20 deletions(-) (limited to 'samples/hw_breakpoint/data_breakpoint.c') diff --git a/kernel/hw_breakpoint.c b/kernel/hw_breakpoint.c index e662dc991c9..9ea9414e0e5 100644 --- a/kernel/hw_breakpoint.c +++ b/kernel/hw_breakpoint.c @@ -454,6 +454,7 @@ fail: /* return the error if any */ return ERR_PTR(err); } +EXPORT_SYMBOL_GPL(register_wide_hw_breakpoint); /** * unregister_wide_hw_breakpoint - unregister a wide breakpoint in the kernel @@ -470,7 +471,7 @@ void unregister_wide_hw_breakpoint(struct perf_event **cpu_events) } free_percpu(cpu_events); } - +EXPORT_SYMBOL_GPL(unregister_wide_hw_breakpoint); static struct notifier_block hw_breakpoint_exceptions_nb = { .notifier_call = hw_breakpoint_exceptions_notify, diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c index 8b6b8b697c6..8e5288a8a35 100644 --- a/kernel/kallsyms.c +++ b/kernel/kallsyms.c @@ -181,6 +181,7 @@ unsigned long kallsyms_lookup_name(const char *name) } return module_kallsyms_lookup_name(name); } +EXPORT_SYMBOL_GPL(kallsyms_lookup_name); int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *, unsigned long), diff --git a/samples/hw_breakpoint/data_breakpoint.c b/samples/hw_breakpoint/data_breakpoint.c index 9cbdbb871b7..5bc9819a819 100644 --- a/samples/hw_breakpoint/data_breakpoint.c +++ b/samples/hw_breakpoint/data_breakpoint.c @@ -27,18 +27,19 @@ #include /* Needed by all modules */ #include /* Needed for KERN_INFO */ #include /* Needed for the macros */ +#include -#include +#include +#include -struct hw_breakpoint sample_hbp; +struct perf_event **sample_hbp; static char ksym_name[KSYM_NAME_LEN] = "pid_max"; module_param_string(ksym, ksym_name, KSYM_NAME_LEN, S_IRUGO); MODULE_PARM_DESC(ksym, "Kernel symbol to monitor; this module will report any" " write operations on the kernel symbol"); -void sample_hbp_handler(struct hw_breakpoint *temp, struct pt_regs - *temp_regs) +static void sample_hbp_handler(struct perf_event *temp, void *data) { printk(KERN_INFO "%s value is changed\n", ksym_name); dump_stack(); @@ -48,30 +49,34 @@ void sample_hbp_handler(struct hw_breakpoint *temp, struct pt_regs static int __init hw_break_module_init(void) { int ret; + unsigned long addr; -#ifdef CONFIG_X86 - sample_hbp.info.name = ksym_name; - sample_hbp.info.type = HW_BREAKPOINT_WRITE; - sample_hbp.info.len = HW_BREAKPOINT_LEN_4; -#endif /* CONFIG_X86 */ + addr = kallsyms_lookup_name(ksym_name); - sample_hbp.triggered = (void *)sample_hbp_handler; + sample_hbp = register_wide_hw_breakpoint(addr, HW_BREAKPOINT_LEN_4, + HW_BREAKPOINT_W | HW_BREAKPOINT_R, + sample_hbp_handler, true); + if (IS_ERR(sample_hbp)) { + ret = PTR_ERR(sample_hbp); + goto fail; + } else if (!sample_hbp) { + ret = -EINVAL; + goto fail; + } - ret = register_kernel_hw_breakpoint(&sample_hbp); - - if (ret < 0) { - printk(KERN_INFO "Breakpoint registration failed\n"); - return ret; - } else - printk(KERN_INFO "HW Breakpoint for %s write installed\n", - ksym_name); + printk(KERN_INFO "HW Breakpoint for %s write installed\n", ksym_name); return 0; + +fail: + printk(KERN_INFO "Breakpoint registration failed\n"); + + return ret; } static void __exit hw_break_module_exit(void) { - unregister_kernel_hw_breakpoint(&sample_hbp); + unregister_wide_hw_breakpoint(sample_hbp); printk(KERN_INFO "HW Breakpoint for %s write uninstalled\n", ksym_name); } -- cgit v1.2.3-70-g09d2 From ba6909b719a5ccc0c8100d2895bb7ff557b2eeae Mon Sep 17 00:00:00 2001 From: "K.Prasad" Date: Mon, 23 Nov 2009 21:17:13 +0530 Subject: hw-breakpoint: Attribute authorship of hw-breakpoint related files Attribute authorship to developers of hw-breakpoint related files. Signed-off-by: K.Prasad Cc: Alan Stern Cc: Frederic Weisbecker LKML-Reference: <20091123154713.GA5593@in.ibm.com> [ v2: moved it to latest -tip ] Signed-off-by: Ingo Molnar --- arch/x86/kernel/hw_breakpoint.c | 4 ++++ kernel/hw_breakpoint.c | 4 ++++ samples/hw_breakpoint/data_breakpoint.c | 2 ++ 3 files changed, 10 insertions(+) (limited to 'samples/hw_breakpoint/data_breakpoint.c') diff --git a/arch/x86/kernel/hw_breakpoint.c b/arch/x86/kernel/hw_breakpoint.c index 752daebe91c..4d267fb7782 100644 --- a/arch/x86/kernel/hw_breakpoint.c +++ b/arch/x86/kernel/hw_breakpoint.c @@ -16,6 +16,10 @@ * Copyright (C) 2007 Alan Stern * Copyright (C) 2009 IBM Corporation * Copyright (C) 2009 Frederic Weisbecker + * + * Authors: Alan Stern + * K.Prasad + * Frederic Weisbecker */ /* diff --git a/kernel/hw_breakpoint.c b/kernel/hw_breakpoint.c index b6d6fa273ee..c16662268d7 100644 --- a/kernel/hw_breakpoint.c +++ b/kernel/hw_breakpoint.c @@ -18,6 +18,10 @@ * Copyright (C) 2009, Frederic Weisbecker * * Thanks to Ingo Molnar for his many suggestions. + * + * Authors: Alan Stern + * K.Prasad + * Frederic Weisbecker */ /* diff --git a/samples/hw_breakpoint/data_breakpoint.c b/samples/hw_breakpoint/data_breakpoint.c index 5bc9819a819..95063818bcf 100644 --- a/samples/hw_breakpoint/data_breakpoint.c +++ b/samples/hw_breakpoint/data_breakpoint.c @@ -23,6 +23,8 @@ * that variable. * * Copyright (C) IBM Corporation, 2009 + * + * Author: K.Prasad */ #include /* Needed by all modules */ #include /* Needed for KERN_INFO */ -- cgit v1.2.3-70-g09d2 From 605bfaee9078cd0b01d83402315389839ee4bb5c Mon Sep 17 00:00:00 2001 From: Frederic Weisbecker Date: Thu, 26 Nov 2009 05:35:42 +0100 Subject: hw-breakpoints: Simplify error handling in breakpoint creation requests This simplifies the error handling when we create a breakpoint. We don't need to check the NULL return value corner case anymore since we have improved perf_event_create_kernel_counter() to always return an error code in the failure case. Signed-off-by: Frederic Weisbecker Cc: Peter Zijlstra Cc: Arnaldo Carvalho de Melo Cc: Paul Mackerras Cc: Steven Rostedt Cc: Prasad LKML-Reference: <1259210142-5714-3-git-send-regression-fweisbec@gmail.com> Signed-off-by: Ingo Molnar --- arch/x86/kernel/ptrace.c | 8 +------- kernel/hw_breakpoint.c | 4 ++-- kernel/trace/trace_ksym.c | 16 ++++------------ samples/hw_breakpoint/data_breakpoint.c | 3 --- 4 files changed, 7 insertions(+), 24 deletions(-) (limited to 'samples/hw_breakpoint/data_breakpoint.c') diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c index b25f8947ed7..75e0cd847bd 100644 --- a/arch/x86/kernel/ptrace.c +++ b/arch/x86/kernel/ptrace.c @@ -657,10 +657,7 @@ restore: tsk, true); thread->ptrace_bps[i] = NULL; - if (!bp) { /* incorrect bp, or we have a bug in bp API */ - rc = -EINVAL; - break; - } + /* Incorrect bp, or we have a bug in bp API */ if (IS_ERR(bp)) { rc = PTR_ERR(bp); bp = NULL; @@ -729,9 +726,6 @@ static int ptrace_set_breakpoint_addr(struct task_struct *tsk, int nr, tsk, bp->attr.disabled); } - - if (!bp) - return -EIO; /* * CHECKME: the previous code returned -EIO if the addr wasn't a * valid task virtual addr. The new one will return -EINVAL in this diff --git a/kernel/hw_breakpoint.c b/kernel/hw_breakpoint.c index 06d372fc026..dd3fb4a999d 100644 --- a/kernel/hw_breakpoint.c +++ b/kernel/hw_breakpoint.c @@ -442,7 +442,7 @@ register_wide_hw_breakpoint(unsigned long addr, *pevent = bp; - if (IS_ERR(bp) || !bp) { + if (IS_ERR(bp)) { err = PTR_ERR(bp); goto fail; } @@ -453,7 +453,7 @@ register_wide_hw_breakpoint(unsigned long addr, fail: for_each_possible_cpu(cpu) { pevent = per_cpu_ptr(cpu_events, cpu); - if (IS_ERR(*pevent) || !*pevent) + if (IS_ERR(*pevent)) break; unregister_hw_breakpoint(*pevent); } diff --git a/kernel/trace/trace_ksym.c b/kernel/trace/trace_ksym.c index 9f040e42f51..c538b15b95d 100644 --- a/kernel/trace/trace_ksym.c +++ b/kernel/trace/trace_ksym.c @@ -200,12 +200,9 @@ int process_new_ksym_entry(char *ksymname, int op, unsigned long addr) entry->ksym_hbp = register_wide_hw_breakpoint(entry->ksym_addr, entry->len, entry->type, ksym_hbp_handler, true); + if (IS_ERR(entry->ksym_hbp)) { - entry->ksym_hbp = NULL; ret = PTR_ERR(entry->ksym_hbp); - } - - if (!entry->ksym_hbp) { printk(KERN_INFO "ksym_tracer request failed. Try again" " later!!\n"); goto err; @@ -332,21 +329,16 @@ static ssize_t ksym_trace_filter_write(struct file *file, if (changed) { unregister_wide_hw_breakpoint(entry->ksym_hbp); entry->type = op; + ret = 0; if (op > 0) { entry->ksym_hbp = register_wide_hw_breakpoint(entry->ksym_addr, entry->len, entry->type, ksym_hbp_handler, true); if (IS_ERR(entry->ksym_hbp)) - entry->ksym_hbp = NULL; - - /* modified without problem */ - if (entry->ksym_hbp) { - ret = 0; + ret = PTR_ERR(entry->ksym_hbp); + else goto out; - } - } else { - ret = 0; } /* Error or "symbol:---" case: drop it */ ksym_filter_entry_count--; diff --git a/samples/hw_breakpoint/data_breakpoint.c b/samples/hw_breakpoint/data_breakpoint.c index 95063818bcf..ee7f9fbaffb 100644 --- a/samples/hw_breakpoint/data_breakpoint.c +++ b/samples/hw_breakpoint/data_breakpoint.c @@ -61,9 +61,6 @@ static int __init hw_break_module_init(void) if (IS_ERR(sample_hbp)) { ret = PTR_ERR(sample_hbp); goto fail; - } else if (!sample_hbp) { - ret = -EINVAL; - goto fail; } printk(KERN_INFO "HW Breakpoint for %s write installed\n", ksym_name); -- cgit v1.2.3-70-g09d2 From dd1853c3f493f6d22d9e5390b192a07b73d2ac0a Mon Sep 17 00:00:00 2001 From: Frederic Weisbecker Date: Fri, 27 Nov 2009 04:55:54 +0100 Subject: hw-breakpoints: Use struct perf_event_attr to define kernel breakpoints Kernel breakpoints are created using functions in which we pass breakpoint parameters as individual variables: address, length and type. Although it fits well for x86, this just does not scale across architectures that may support this api later as these may have more or different needs. Pass in a perf_event_attr structure instead because it is meant to evolve as much as possible into a generic hardware breakpoint parameter structure. Reported-by: K.Prasad Signed-off-by: Frederic Weisbecker LKML-Reference: <1259294154-5197-2-git-send-regression-fweisbec@gmail.com> Signed-off-by: Ingo Molnar --- include/linux/hw_breakpoint.h | 35 ++++++++++++--------------- kernel/hw_breakpoint.c | 35 ++++----------------------- kernel/trace/trace_ksym.c | 42 ++++++++++++++++----------------- samples/hw_breakpoint/data_breakpoint.c | 10 ++++---- 4 files changed, 44 insertions(+), 78 deletions(-) (limited to 'samples/hw_breakpoint/data_breakpoint.c') diff --git a/include/linux/hw_breakpoint.h b/include/linux/hw_breakpoint.h index 5da472e434b..a03daed08c5 100644 --- a/include/linux/hw_breakpoint.h +++ b/include/linux/hw_breakpoint.h @@ -28,6 +28,13 @@ struct perf_event_attr name = { \ .pinned = 1, \ }; +static inline void hw_breakpoint_init(struct perf_event_attr *attr) +{ + attr->type = PERF_TYPE_BREAKPOINT; + attr->size = sizeof(*attr); + attr->pinned = 1; +} + static inline unsigned long hw_breakpoint_addr(struct perf_event *bp) { return bp->attr.bp_addr; @@ -59,19 +66,13 @@ modify_user_hw_breakpoint(struct perf_event *bp, * Kernel breakpoints are not associated with any particular thread. */ extern struct perf_event * -register_wide_hw_breakpoint_cpu(unsigned long addr, - int len, - int type, +register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr, perf_callback_t triggered, - int cpu, - bool active); + int cpu); extern struct perf_event ** -register_wide_hw_breakpoint(unsigned long addr, - int len, - int type, - perf_callback_t triggered, - bool active); +register_wide_hw_breakpoint(struct perf_event_attr *attr, + perf_callback_t triggered); extern int register_perf_hw_breakpoint(struct perf_event *bp); extern int __register_perf_hw_breakpoint(struct perf_event *bp); @@ -100,18 +101,12 @@ modify_user_hw_breakpoint(struct perf_event *bp, perf_callback_t triggered, struct task_struct *tsk) { return NULL; } static inline struct perf_event * -register_wide_hw_breakpoint_cpu(unsigned long addr, - int len, - int type, +register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr, perf_callback_t triggered, - int cpu, - bool active) { return NULL; } + int cpu) { return NULL; } static inline struct perf_event ** -register_wide_hw_breakpoint(unsigned long addr, - int len, - int type, - perf_callback_t triggered, - bool active) { return NULL; } +register_wide_hw_breakpoint(struct perf_event_attr *attr, + perf_callback_t triggered) { return NULL; } static inline int register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; } static inline int diff --git a/kernel/hw_breakpoint.c b/kernel/hw_breakpoint.c index 2a47514f12f..cf5ee162841 100644 --- a/kernel/hw_breakpoint.c +++ b/kernel/hw_breakpoint.c @@ -339,42 +339,16 @@ void unregister_hw_breakpoint(struct perf_event *bp) } EXPORT_SYMBOL_GPL(unregister_hw_breakpoint); -static struct perf_event * -register_kernel_hw_breakpoint_cpu(unsigned long addr, - int len, - int type, - perf_callback_t triggered, - int cpu, - bool active) -{ - DEFINE_BREAKPOINT_ATTR(attr); - - attr.bp_addr = addr; - attr.bp_len = len; - attr.bp_type = type; - - if (!active) - attr.disabled = 1; - - return perf_event_create_kernel_counter(&attr, cpu, -1, triggered); -} - /** * register_wide_hw_breakpoint - register a wide breakpoint in the kernel - * @addr: is the memory address that triggers the breakpoint - * @len: the length of the access to the memory (1 byte, 2 bytes etc...) - * @type: the type of the access to the memory (read/write/exec) + * @attr: breakpoint attributes * @triggered: callback to trigger when we hit the breakpoint - * @active: should we activate it while registering it * * @return a set of per_cpu pointers to perf events */ struct perf_event ** -register_wide_hw_breakpoint(unsigned long addr, - int len, - int type, - perf_callback_t triggered, - bool active) +register_wide_hw_breakpoint(struct perf_event_attr *attr, + perf_callback_t triggered) { struct perf_event **cpu_events, **pevent, *bp; long err; @@ -386,8 +360,7 @@ register_wide_hw_breakpoint(unsigned long addr, for_each_possible_cpu(cpu) { pevent = per_cpu_ptr(cpu_events, cpu); - bp = register_kernel_hw_breakpoint_cpu(addr, len, type, - triggered, cpu, active); + bp = perf_event_create_kernel_counter(attr, cpu, -1, triggered); *pevent = bp; diff --git a/kernel/trace/trace_ksym.c b/kernel/trace/trace_ksym.c index c538b15b95d..ddfa0fd43bc 100644 --- a/kernel/trace/trace_ksym.c +++ b/kernel/trace/trace_ksym.c @@ -42,9 +42,7 @@ struct trace_ksym { struct perf_event **ksym_hbp; - unsigned long ksym_addr; - int type; - int len; + struct perf_event_attr attr; #ifdef CONFIG_PROFILE_KSYM_TRACER unsigned long counter; #endif @@ -71,7 +69,7 @@ void ksym_collect_stats(unsigned long hbp_hit_addr) rcu_read_lock(); hlist_for_each_entry_rcu(entry, node, &ksym_filter_head, ksym_hlist) { - if ((entry->ksym_addr == hbp_hit_addr) && + if ((entry->attr.bp_addr == hbp_hit_addr) && (entry->counter <= MAX_UL_INT)) { entry->counter++; break; @@ -192,14 +190,15 @@ int process_new_ksym_entry(char *ksymname, int op, unsigned long addr) if (!entry) return -ENOMEM; - entry->type = op; - entry->ksym_addr = addr; - entry->len = HW_BREAKPOINT_LEN_4; + hw_breakpoint_init(&entry->attr); + + entry->attr.bp_type = op; + entry->attr.bp_addr = addr; + entry->attr.bp_len = HW_BREAKPOINT_LEN_4; ret = -EAGAIN; - entry->ksym_hbp = register_wide_hw_breakpoint(entry->ksym_addr, - entry->len, entry->type, - ksym_hbp_handler, true); + entry->ksym_hbp = register_wide_hw_breakpoint(&entry->attr, + ksym_hbp_handler); if (IS_ERR(entry->ksym_hbp)) { ret = PTR_ERR(entry->ksym_hbp); @@ -236,12 +235,12 @@ static ssize_t ksym_trace_filter_read(struct file *filp, char __user *ubuf, mutex_lock(&ksym_tracer_mutex); hlist_for_each_entry(entry, node, &ksym_filter_head, ksym_hlist) { - ret = trace_seq_printf(s, "%pS:", (void *)entry->ksym_addr); - if (entry->type == HW_BREAKPOINT_R) + ret = trace_seq_printf(s, "%pS:", (void *)entry->attr.bp_addr); + if (entry->attr.bp_type == HW_BREAKPOINT_R) ret = trace_seq_puts(s, "r--\n"); - else if (entry->type == HW_BREAKPOINT_W) + else if (entry->attr.bp_type == HW_BREAKPOINT_W) ret = trace_seq_puts(s, "-w-\n"); - else if (entry->type == (HW_BREAKPOINT_W | HW_BREAKPOINT_R)) + else if (entry->attr.bp_type == (HW_BREAKPOINT_W | HW_BREAKPOINT_R)) ret = trace_seq_puts(s, "rw-\n"); WARN_ON_ONCE(!ret); } @@ -317,9 +316,9 @@ static ssize_t ksym_trace_filter_write(struct file *file, ret = -EINVAL; hlist_for_each_entry(entry, node, &ksym_filter_head, ksym_hlist) { - if (entry->ksym_addr == ksym_addr) { + if (entry->attr.bp_addr == ksym_addr) { /* Check for malformed request: (6) */ - if (entry->type != op) + if (entry->attr.bp_type != op) changed = 1; else goto out; @@ -328,13 +327,12 @@ static ssize_t ksym_trace_filter_write(struct file *file, } if (changed) { unregister_wide_hw_breakpoint(entry->ksym_hbp); - entry->type = op; + entry->attr.bp_type = op; ret = 0; if (op > 0) { entry->ksym_hbp = - register_wide_hw_breakpoint(entry->ksym_addr, - entry->len, entry->type, - ksym_hbp_handler, true); + register_wide_hw_breakpoint(&entry->attr, + ksym_hbp_handler); if (IS_ERR(entry->ksym_hbp)) ret = PTR_ERR(entry->ksym_hbp); else @@ -489,7 +487,7 @@ static int ksym_tracer_stat_show(struct seq_file *m, void *v) entry = hlist_entry(stat, struct trace_ksym, ksym_hlist); - access_type = entry->type; + access_type = entry->attr.bp_type; switch (access_type) { case HW_BREAKPOINT_R: @@ -505,7 +503,7 @@ static int ksym_tracer_stat_show(struct seq_file *m, void *v) seq_puts(m, " NA "); } - if (lookup_symbol_name(entry->ksym_addr, fn_name) >= 0) + if (lookup_symbol_name(entry->attr.bp_addr, fn_name) >= 0) seq_printf(m, " %-36s", fn_name); else seq_printf(m, " %-36s", ""); diff --git a/samples/hw_breakpoint/data_breakpoint.c b/samples/hw_breakpoint/data_breakpoint.c index ee7f9fbaffb..29525500df0 100644 --- a/samples/hw_breakpoint/data_breakpoint.c +++ b/samples/hw_breakpoint/data_breakpoint.c @@ -51,13 +51,13 @@ static void sample_hbp_handler(struct perf_event *temp, void *data) static int __init hw_break_module_init(void) { int ret; - unsigned long addr; + DEFINE_BREAKPOINT_ATTR(attr); - addr = kallsyms_lookup_name(ksym_name); + attr.bp_addr = kallsyms_lookup_name(ksym_name); + attr.bp_len = HW_BREAKPOINT_LEN_4; + attr.bp_type = HW_BREAKPOINT_W | HW_BREAKPOINT_R; - sample_hbp = register_wide_hw_breakpoint(addr, HW_BREAKPOINT_LEN_4, - HW_BREAKPOINT_W | HW_BREAKPOINT_R, - sample_hbp_handler, true); + sample_hbp = register_wide_hw_breakpoint(&attr, sample_hbp_handler); if (IS_ERR(sample_hbp)) { ret = PTR_ERR(sample_hbp); goto fail; -- cgit v1.2.3-70-g09d2