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Tue, 17 Sep 2024 05:37:11 GMT Received: from smtpav04.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0369858050; Tue, 17 Sep 2024 05:37:11 +0000 (GMT) Received: from smtpav04.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5CB2058052; Tue, 17 Sep 2024 05:36:57 +0000 (GMT) Received: from [9.43.81.97] (unknown [9.43.81.97]) by smtpav04.wdc07v.mail.ibm.com (Postfix) with ESMTP; Tue, 17 Sep 2024 05:36:57 +0000 (GMT) Message-ID: <64fbdf0b-02b9-43cd-a0ba-89e37f2615f8@linux.ibm.com> Date: Tue, 17 Sep 2024 11:06:54 +0530 Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 2/5] perf: Hoist perf_instruction_pointer() and perf_misc_flags() To: Colton Lewis , kvm@vger.kernel.org Cc: Oliver Upton , Sean Christopherson , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , Kan Liang , Will Deacon , Russell King , Catalin Marinas , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Naveen N Rao , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Thomas Gleixner , Borislav Petkov , Dave Hansen , x86@kernel.org, "H . Peter Anvin" , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org References: <20240912205133.4171576-1-coltonlewis@google.com> <20240912205133.4171576-3-coltonlewis@google.com> Content-Language: en-US From: Madhavan Srinivasan In-Reply-To: <20240912205133.4171576-3-coltonlewis@google.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: gCr9z-Ag2yvf1oDEJ19gugT8Q6t_NwFY X-Proofpoint-GUID: QTSYotEEB_qIeDnpl69YaMBZY4DirbZx X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-17_01,2024-09-16_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 mlxlogscore=999 priorityscore=1501 phishscore=0 clxscore=1011 malwarescore=0 bulkscore=0 impostorscore=0 spamscore=0 suspectscore=0 mlxscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2408220000 definitions=main-2409170040 On 9/13/24 2:21 AM, Colton Lewis wrote: > For clarity, rename the arch-specific definitions of these functions > to perf_arch_* to denote they are arch-specifc. Define the > generic-named functions in one place where they can call the > arch-specific ones as needed. > > Signed-off-by: Colton Lewis > --- > arch/arm64/include/asm/perf_event.h | 6 +++--- > arch/arm64/kernel/perf_callchain.c | 4 ++-- > arch/powerpc/include/asm/perf_event_server.h | 6 +++--- > arch/powerpc/perf/core-book3s.c | 4 ++-- > arch/s390/include/asm/perf_event.h | 6 +++--- > arch/s390/kernel/perf_event.c | 4 ++-- > arch/x86/events/core.c | 4 ++-- > arch/x86/include/asm/perf_event.h | 10 +++++----- > include/linux/perf_event.h | 9 ++++++--- > kernel/events/core.c | 10 ++++++++++ > 10 files changed, 38 insertions(+), 25 deletions(-) > > diff --git a/arch/arm64/include/asm/perf_event.h b/arch/arm64/include/asm/perf_event.h > index eb7071c9eb34..31a5584ed423 100644 > --- a/arch/arm64/include/asm/perf_event.h > +++ b/arch/arm64/include/asm/perf_event.h > @@ -11,9 +11,9 @@ > > #ifdef CONFIG_PERF_EVENTS > struct pt_regs; > -extern unsigned long perf_instruction_pointer(struct pt_regs *regs); > -extern unsigned long perf_misc_flags(struct pt_regs *regs); > -#define perf_misc_flags(regs) perf_misc_flags(regs) > +extern unsigned long perf_arch_instruction_pointer(struct pt_regs *regs); > +extern unsigned long perf_arch_misc_flags(struct pt_regs *regs); > +#define perf_arch_misc_flags(regs) perf_misc_flags(regs) > #define perf_arch_bpf_user_pt_regs(regs) ®s->user_regs > #endif > > diff --git a/arch/arm64/kernel/perf_callchain.c b/arch/arm64/kernel/perf_callchain.c > index e8ed5673f481..01a9d08fc009 100644 > --- a/arch/arm64/kernel/perf_callchain.c > +++ b/arch/arm64/kernel/perf_callchain.c > @@ -39,7 +39,7 @@ void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, > arch_stack_walk(callchain_trace, entry, current, regs); > } > > -unsigned long perf_instruction_pointer(struct pt_regs *regs) > +unsigned long perf_arch_instruction_pointer(struct pt_regs *regs) > { > if (perf_guest_state()) > return perf_guest_get_ip(); > @@ -47,7 +47,7 @@ unsigned long perf_instruction_pointer(struct pt_regs *regs) > return instruction_pointer(regs); > } > > -unsigned long perf_misc_flags(struct pt_regs *regs) > +unsigned long perf_arch_misc_flags(struct pt_regs *regs) > { > unsigned int guest_state = perf_guest_state(); > int misc = 0; > diff --git a/arch/powerpc/include/asm/perf_event_server.h b/arch/powerpc/include/asm/perf_event_server.h > index 5995614e9062..41587d3f8446 100644 > --- a/arch/powerpc/include/asm/perf_event_server.h > +++ b/arch/powerpc/include/asm/perf_event_server.h > @@ -102,8 +102,8 @@ struct power_pmu { > int __init register_power_pmu(struct power_pmu *pmu); > > struct pt_regs; > -extern unsigned long perf_misc_flags(struct pt_regs *regs); > -extern unsigned long perf_instruction_pointer(struct pt_regs *regs); > +extern unsigned long perf_arch_misc_flags(struct pt_regs *regs); > +extern unsigned long perf_arch_instruction_pointer(struct pt_regs *regs); > extern unsigned long int read_bhrb(int n); > > /* > @@ -111,7 +111,7 @@ extern unsigned long int read_bhrb(int n); > * if we have hardware PMU support. > */ > #ifdef CONFIG_PPC_PERF_CTRS > -#define perf_misc_flags(regs) perf_misc_flags(regs) > +#define perf_arch_misc_flags(regs) perf_misc_flags(regs) > #endif > Compilation fails with In file included from /linux/arch/powerpc/include/asm/perf_event.h:14,                  from /linux/include/linux/perf_event.h:25,                  from /linux/arch/powerpc/perf/core-book3s.c:10: /linux/arch/powerpc/include/asm/perf_event_server.h:114:41: error: conflicting types for 'perf_misc_flags'; have 'long unsigned int(struct pt_regs *)'   114 | #define perf_arch_misc_flags(regs)      perf_misc_flags(regs) |                                         ^~~~~~~~~~~~~~~ /linux/arch/powerpc/perf/core-book3s.c:2335:15: note: in expansion of macro 'perf_arch_misc_flags'  2335 | unsigned long perf_arch_misc_flags(struct pt_regs *regs)       |               ^~~~~~~~~~~~~~~~~~~~ /linux/include/linux/perf_event.h:1630:22: note: previous declaration of 'perf_misc_flags' with type 'long unsigned int(struct perf_event *, struct pt_regs *)'  1630 | extern unsigned long perf_misc_flags(struct perf_event *event, struct pt_regs *regs);       |                      ^~~~~~~~~~~~~~~ This fixes the fail --- a/arch/powerpc/include/asm/perf_event_server.h +++ b/arch/powerpc/include/asm/perf_event_server.h @@ -111,7 +111,7 @@ extern unsigned long int read_bhrb(int n);   * if we have hardware PMU support.   */  #ifdef CONFIG_PPC_PERF_CTRS -#define perf_arch_misc_flags(regs) perf_misc_flags(regs) +#define perf_arch_misc_flags(regs) perf_arch_misc_flags(regs)  #endif  /* > /* > diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c > index 42867469752d..dc01aa604cc1 100644 > --- a/arch/powerpc/perf/core-book3s.c > +++ b/arch/powerpc/perf/core-book3s.c > @@ -2332,7 +2332,7 @@ static void record_and_restart(struct perf_event *event, unsigned long val, > * Called from generic code to get the misc flags (i.e. processor mode) > * for an event_id. > */ > -unsigned long perf_misc_flags(struct pt_regs *regs) > +unsigned long perf_arch_misc_flags(struct pt_regs *regs) > { > u32 flags = perf_get_misc_flags(regs); > > @@ -2346,7 +2346,7 @@ unsigned long perf_misc_flags(struct pt_regs *regs) > * Called from generic code to get the instruction pointer > * for an event_id. > */ > -unsigned long perf_instruction_pointer(struct pt_regs *regs) > +unsigned long perf_arch_instruction_pointer(struct pt_regs *regs) > { > unsigned long siar = mfspr(SPRN_SIAR); > > diff --git a/arch/s390/include/asm/perf_event.h b/arch/s390/include/asm/perf_event.h > index 9917e2717b2b..f2d83289ec7a 100644 > --- a/arch/s390/include/asm/perf_event.h > +++ b/arch/s390/include/asm/perf_event.h > @@ -37,9 +37,9 @@ extern ssize_t cpumf_events_sysfs_show(struct device *dev, > > /* Perf callbacks */ > struct pt_regs; > -extern unsigned long perf_instruction_pointer(struct pt_regs *regs); > -extern unsigned long perf_misc_flags(struct pt_regs *regs); > -#define perf_misc_flags(regs) perf_misc_flags(regs) > +extern unsigned long perf_arch_instruction_pointer(struct pt_regs *regs); > +extern unsigned long perf_arch_misc_flags(struct pt_regs *regs); > +#define perf_arch_misc_flags(regs) perf_misc_flags(regs) > #define perf_arch_bpf_user_pt_regs(regs) ®s->user_regs > > /* Perf pt_regs extension for sample-data-entry indicators */ > diff --git a/arch/s390/kernel/perf_event.c b/arch/s390/kernel/perf_event.c > index 5fff629b1a89..f9000ab49f4a 100644 > --- a/arch/s390/kernel/perf_event.c > +++ b/arch/s390/kernel/perf_event.c > @@ -57,7 +57,7 @@ static unsigned long instruction_pointer_guest(struct pt_regs *regs) > return sie_block(regs)->gpsw.addr; > } > > -unsigned long perf_instruction_pointer(struct pt_regs *regs) > +unsigned long perf_arch_instruction_pointer(struct pt_regs *regs) > { > return is_in_guest(regs) ? instruction_pointer_guest(regs) > : instruction_pointer(regs); > @@ -84,7 +84,7 @@ static unsigned long perf_misc_flags_sf(struct pt_regs *regs) > return flags; > } > > -unsigned long perf_misc_flags(struct pt_regs *regs) > +unsigned long perf_arch_misc_flags(struct pt_regs *regs) > { > /* Check if the cpum_sf PMU has created the pt_regs structure. > * In this case, perf misc flags can be easily extracted. Otherwise, > diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c > index be01823b1bb4..760ad067527c 100644 > --- a/arch/x86/events/core.c > +++ b/arch/x86/events/core.c > @@ -2940,7 +2940,7 @@ static unsigned long code_segment_base(struct pt_regs *regs) > return 0; > } > > -unsigned long perf_instruction_pointer(struct pt_regs *regs) > +unsigned long perf_arch_instruction_pointer(struct pt_regs *regs) > { > if (perf_guest_state()) > return perf_guest_get_ip(); > @@ -2948,7 +2948,7 @@ unsigned long perf_instruction_pointer(struct pt_regs *regs) > return regs->ip + code_segment_base(regs); > } > > -unsigned long perf_misc_flags(struct pt_regs *regs) > +unsigned long perf_arch_misc_flags(struct pt_regs *regs) > { > unsigned int guest_state = perf_guest_state(); > int misc = 0; > diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h > index 91b73571412f..feb87bf3d2e9 100644 > --- a/arch/x86/include/asm/perf_event.h > +++ b/arch/x86/include/asm/perf_event.h > @@ -536,15 +536,15 @@ struct x86_perf_regs { > u64 *xmm_regs; > }; > > -extern unsigned long perf_instruction_pointer(struct pt_regs *regs); > -extern unsigned long perf_misc_flags(struct pt_regs *regs); > -#define perf_misc_flags(regs) perf_misc_flags(regs) > +extern unsigned long perf_arch_instruction_pointer(struct pt_regs *regs); > +extern unsigned long perf_arch_misc_flags(struct pt_regs *regs); > +#define perf_arch_misc_flags(regs) perf_arch_misc_flags(regs) > > #include > > /* > - * We abuse bit 3 from flags to pass exact information, see perf_misc_flags > - * and the comment with PERF_EFLAGS_EXACT. > + * We abuse bit 3 from flags to pass exact information, see > + * perf_arch_misc_flags() and the comment with PERF_EFLAGS_EXACT. > */ > #define perf_arch_fetch_caller_regs(regs, __ip) { \ > (regs)->ip = (__ip); \ > diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h > index 1a8942277dda..d061e327ad54 100644 > --- a/include/linux/perf_event.h > +++ b/include/linux/perf_event.h > @@ -1633,10 +1633,13 @@ extern void perf_tp_event(u16 event_type, u64 count, void *record, > struct task_struct *task); > extern void perf_bp_event(struct perf_event *event, void *data); > > -#ifndef perf_misc_flags > -# define perf_misc_flags(regs) \ > +extern unsigned long perf_misc_flags(struct pt_regs *regs); > +extern unsigned long perf_instruction_pointer(struct pt_regs *regs); > + > +#ifndef perf_arch_misc_flags > +# define perf_arch_misc_flags(regs) \ > (user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL) > -# define perf_instruction_pointer(regs) instruction_pointer(regs) > +# define perf_arch_instruction_pointer(regs) instruction_pointer(regs) > #endif > #ifndef perf_arch_bpf_user_pt_regs > # define perf_arch_bpf_user_pt_regs(regs) regs > diff --git a/kernel/events/core.c b/kernel/events/core.c > index 8a6c6bbcd658..eeabbf791a8c 100644 > --- a/kernel/events/core.c > +++ b/kernel/events/core.c > @@ -6921,6 +6921,16 @@ void perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *cbs) > EXPORT_SYMBOL_GPL(perf_unregister_guest_info_callbacks); > #endif > > +unsigned long perf_misc_flags(struct pt_regs *regs) > +{ > + return perf_arch_misc_flags(regs); > +} > + > +unsigned long perf_instruction_pointer(struct pt_regs *regs) > +{ > + return perf_arch_instruction_pointer(regs); > +} > + > static void > perf_output_sample_regs(struct perf_output_handle *handle, > struct pt_regs *regs, u64 mask)