Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754805Ab2HGNVe (ORCPT ); Tue, 7 Aug 2012 09:21:34 -0400 Received: from mx1.redhat.com ([209.132.183.28]:45882 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754723Ab2HGNV3 (ORCPT ); Tue, 7 Aug 2012 09:21:29 -0400 From: Jiri Olsa To: linux-kernel@vger.kernel.org Cc: Arnaldo Carvalho de Melo , Arun Sharma , Benjamin Redelings , Corey Ashford , Cyrill Gorcunov , "Frank Ch. Eigler" , Frederic Weisbecker , Ingo Molnar , Masami Hiramatsu , Paul Mackerras , Peter Zijlstra , Robert Richter , Stephane Eranian , Tom Zanussi , Ulrich Drepper , Jiri Olsa Subject: [PATCH 02/12] perf: Add ability to attach user level registers dump to sample Date: Tue, 7 Aug 2012 15:20:37 +0200 Message-Id: <1344345647-11536-3-git-send-email-jolsa@redhat.com> In-Reply-To: <1344345647-11536-1-git-send-email-jolsa@redhat.com> References: <1344345647-11536-1-git-send-email-jolsa@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 8963 Lines: 310 Introducing PERF_SAMPLE_REGS_USER sample type bit to trigger the dump of user level registers on sample. Registers we want to dump are specified by sample_regs_user bitmask. Only user level registers are dumped at the moment. Meaning the register values of the user space context as it was before the user entered the kernel for whatever reason (syscall, irq, exception, or a PMI happening in userspace). The layout of the sample_regs_user bitmap is described in asm/perf_regs.h for archs that support register dump. This is going to be useful to bring Dwarf CFI based stack unwinding on top of samples. Original-patch-by: Frederic Weisbecker [ Dump registers ABI specification. ] Suggested-by: Stephane Eranian Cc: Arnaldo Carvalho de Melo Cc: Arun Sharma Cc: Benjamin Redelings Cc: Corey Ashford Cc: Cyrill Gorcunov Cc: Frank Ch. Eigler Cc: Frederic Weisbecker Cc: Ingo Molnar Cc: Masami Hiramatsu Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Robert Richter Cc: Stephane Eranian Cc: Tom Zanussi Cc: Ulrich Drepper Signed-off-by: Jiri Olsa --- arch/x86/kernel/perf_regs.c | 15 +++++++++++ include/linux/perf_event.h | 35 +++++++++++++++++++++--- include/linux/perf_regs.h | 6 +++++ kernel/events/core.c | 66 +++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 119 insertions(+), 3 deletions(-) diff --git a/arch/x86/kernel/perf_regs.c b/arch/x86/kernel/perf_regs.c index 3d692352..c5a3e5c 100644 --- a/arch/x86/kernel/perf_regs.c +++ b/arch/x86/kernel/perf_regs.c @@ -1,5 +1,7 @@ #include #include +#include +#include #include #include #include @@ -71,6 +73,11 @@ int perf_reg_validate(u64 mask) return 0; } + +u64 perf_reg_abi(struct task_struct *task) +{ + return PERF_SAMPLE_REGS_ABI_32; +} #else /* CONFIG_X86_64 */ #define REG_NOSUPPORT ((1ULL << PERF_REG_X86_DS) | \ (1ULL << PERF_REG_X86_ES) | \ @@ -87,4 +94,12 @@ int perf_reg_validate(u64 mask) return 0; } + +u64 perf_reg_abi(struct task_struct *task) +{ + if (test_tsk_thread_flag(task, TIF_IA32)) + return PERF_SAMPLE_REGS_ABI_32; + else + return PERF_SAMPLE_REGS_ABI_64; +} #endif /* CONFIG_X86_32 */ diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 7602ccb..3d4d847 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -130,8 +130,9 @@ enum perf_event_sample_format { PERF_SAMPLE_STREAM_ID = 1U << 9, PERF_SAMPLE_RAW = 1U << 10, PERF_SAMPLE_BRANCH_STACK = 1U << 11, + PERF_SAMPLE_REGS_USER = 1U << 12, - PERF_SAMPLE_MAX = 1U << 12, /* non-ABI */ + PERF_SAMPLE_MAX = 1U << 13, /* non-ABI */ }; /* @@ -163,6 +164,15 @@ enum perf_branch_sample_type { PERF_SAMPLE_BRANCH_HV) /* + * Values to determine ABI of the registers dump. + */ +enum perf_sample_regs_abi { + PERF_SAMPLE_REGS_ABI_NONE = 0, + PERF_SAMPLE_REGS_ABI_32 = 1, + PERF_SAMPLE_REGS_ABI_64 = 2, +}; + +/* * The format of the data returned by read() on a perf event fd, * as specified by attr.read_format: * @@ -194,6 +204,7 @@ enum perf_event_read_format { #define PERF_ATTR_SIZE_VER0 64 /* sizeof first published struct */ #define PERF_ATTR_SIZE_VER1 72 /* add: config2 */ #define PERF_ATTR_SIZE_VER2 80 /* add: branch_sample_type */ +#define PERF_ATTR_SIZE_VER3 88 /* add: sample_regs_user */ /* * Hardware event_id to monitor via a performance monitoring event: @@ -271,7 +282,13 @@ struct perf_event_attr { __u64 bp_len; __u64 config2; /* extension of config1 */ }; - __u64 branch_sample_type; /* enum branch_sample_type */ + __u64 branch_sample_type; /* enum perf_branch_sample_type */ + + /* + * Defines set of user regs to dump on samples. + * See asm/perf_regs.h for details. + */ + __u64 sample_regs_user; }; /* @@ -548,6 +565,9 @@ enum perf_event_type { * char data[size];}&& PERF_SAMPLE_RAW * * { u64 from, to, flags } lbr[nr];} && PERF_SAMPLE_BRANCH_STACK + * + * { u64 abi; # enum perf_sample_regs_abi + * u64 regs[weight(mask)]; } && PERF_SAMPLE_REGS_USER * }; */ PERF_RECORD_SAMPLE = 9, @@ -609,6 +629,7 @@ struct perf_guest_info_callbacks { #include #include #include +#include #include struct perf_callchain_entry { @@ -654,6 +675,11 @@ struct perf_branch_stack { struct perf_branch_entry entries[0]; }; +struct perf_regs_user { + __u64 abi; + struct pt_regs *regs; +}; + struct task_struct; /* @@ -1133,6 +1159,7 @@ struct perf_sample_data { struct perf_callchain_entry *callchain; struct perf_raw_record *raw; struct perf_branch_stack *br_stack; + struct perf_regs_user regs_user; }; static inline void perf_sample_data_init(struct perf_sample_data *data, @@ -1142,7 +1169,9 @@ static inline void perf_sample_data_init(struct perf_sample_data *data, data->addr = addr; data->raw = NULL; data->br_stack = NULL; - data->period = period; + data->period = period; + data->regs_user.abi = PERF_SAMPLE_REGS_ABI_NONE; + data->regs_user.regs = NULL; } extern void perf_output_sample(struct perf_output_handle *handle, diff --git a/include/linux/perf_regs.h b/include/linux/perf_regs.h index a2f1a98..3c73d5f 100644 --- a/include/linux/perf_regs.h +++ b/include/linux/perf_regs.h @@ -5,6 +5,7 @@ #include u64 perf_reg_value(struct pt_regs *regs, int idx); int perf_reg_validate(u64 mask); +u64 perf_reg_abi(struct task_struct *task); #else static inline u64 perf_reg_value(struct pt_regs *regs, int idx) { @@ -15,5 +16,10 @@ static inline int perf_reg_validate(u64 mask) { return mask ? -ENOSYS : 0; } + +static inline u64 perf_reg_abi(struct task_struct *task) +{ + return PERF_SAMPLE_REGS_ABI_NONE; +} #endif /* CONFIG_HAVE_PERF_REGS */ #endif /* _LINUX_PERF_REGS_H */ diff --git a/kernel/events/core.c b/kernel/events/core.c index b7935fc..d3ce975 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -3756,6 +3756,37 @@ int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *cbs) } EXPORT_SYMBOL_GPL(perf_unregister_guest_info_callbacks); +static void +perf_output_sample_regs(struct perf_output_handle *handle, + struct pt_regs *regs, u64 mask) +{ + int bit; + + for_each_set_bit(bit, (const unsigned long *) &mask, + sizeof(mask) * BITS_PER_BYTE) { + u64 val; + + val = perf_reg_value(regs, bit); + perf_output_put(handle, val); + } +} + +static void perf_sample_regs_user(struct perf_regs_user *regs_user, + struct pt_regs *regs) +{ + if (!user_mode(regs)) { + if (current->mm) + regs = task_pt_regs(current); + else + regs = NULL; + } + + if (regs) { + regs_user->regs = regs; + regs_user->abi = perf_reg_abi(current); + } +} + static void __perf_event_header__init_id(struct perf_event_header *header, struct perf_sample_data *data, struct perf_event *event) @@ -4016,6 +4047,23 @@ void perf_output_sample(struct perf_output_handle *handle, perf_output_put(handle, nr); } } + + if (sample_type & PERF_SAMPLE_REGS_USER) { + u64 abi = data->regs_user.abi; + + /* + * If there are no regs to dump, notice it through + * first u64 being zero (PERF_SAMPLE_REGS_ABI_NONE). + */ + perf_output_put(handle, abi); + + if (abi) { + u64 mask = event->attr.sample_regs_user; + perf_output_sample_regs(handle, + data->regs_user.regs, + mask); + } + } } void perf_prepare_sample(struct perf_event_header *header, @@ -4067,6 +4115,20 @@ void perf_prepare_sample(struct perf_event_header *header, } header->size += size; } + + if (sample_type & PERF_SAMPLE_REGS_USER) { + /* regs dump ABI info */ + int size = sizeof(u64); + + perf_sample_regs_user(&data->regs_user, regs); + + if (data->regs_user.regs) { + u64 mask = event->attr.sample_regs_user; + size += hweight64(mask) * sizeof(u64); + } + + header->size += size; + } } static void perf_event_output(struct perf_event *event, @@ -6142,6 +6204,10 @@ static int perf_copy_attr(struct perf_event_attr __user *uattr, attr->branch_sample_type = mask; } } + + if (attr->sample_type & PERF_SAMPLE_REGS_USER) + ret = perf_reg_validate(attr->sample_regs_user); + out: return ret; -- 1.7.11.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/