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Mon, 15 Sep 2025 10:30:05 GMT Received: from smtpav07.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9AC8920040; Mon, 15 Sep 2025 10:30:05 +0000 (GMT) Received: from smtpav07.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2CBD72004B; Mon, 15 Sep 2025 10:29:59 +0000 (GMT) Received: from localhost.localdomain (unknown [9.61.244.131]) by smtpav07.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 15 Sep 2025 10:29:58 +0000 (GMT) From: Athira Rajeev To: maddy@linux.ibm.com, linuxppc-dev@lists.ozlabs.org Cc: acme@kernel.org, jolsa@kernel.org, adrian.hunter@intel.com, irogers@google.com, namhyung@kernel.org, linux-perf-users@vger.kernel.org, aboorvad@linux.ibm.com, sshegde@linux.ibm.com, atrajeev@linux.ibm.com, hbathini@linux.vnet.ibm.com, Aditya.Bodkhe1@ibm.com, venkat88@linux.ibm.com, Tejas.Manhas1@ibm.com Subject: [PATCH V3 1/7] powerpc/time: Expose boot_tb via accessor Date: Mon, 15 Sep 2025 15:59:41 +0530 Message-Id: <20250915102947.26681-2-atrajeev@linux.ibm.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) In-Reply-To: <20250915102947.26681-1-atrajeev@linux.ibm.com> References: <20250915102947.26681-1-atrajeev@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwOTEzMDAxMCBTYWx0ZWRfX3mCo3PUg1eXU /2LD1c+R/1Sn781FWv+e4TuOQGqX4hUaEL1vsPQqTDhtZPTNEEW7hU9/1FhhyPPZ5twF8RI9iMm QZWa9l6SL2dbqFg6hTr7RZppLaK8TasETytrrA+I4ljoEwXhYGEjXsmFM/cQk94H12OO7BEjnZw pYpAguzOXlRnk4ewa8Zi0HK8dzx0Nqaf973PYW/XxtwqF0M5c6mSPlxxTBIKwzKb2znSskC+gzf uvmsbjJnkdNymGym/pb/fKIuQk+iqh8D+pR1uKX+x3J4c/Rrhz/76zAyTgCcw0/rYZFyC6MqalN n+yNVJ4ZryBlYsCSgVuqJ0PYYSArwhY77PoPtNFb1NS12uptEJFPERAl6czKoJU6qeb4NdOn43v bv+9cgvR X-Proofpoint-ORIG-GUID: hWm8zsoA5b9mRlgo2Oz85I4mqTt_tZB7 X-Authority-Analysis: v=2.4 cv=euPfzppX c=1 sm=1 tr=0 ts=68c7eab2 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=yJojWOMRYYMA:10 a=VnNF1IyMAAAA:8 a=cbn_3OFnJLNrDsZptFIA:9 X-Proofpoint-GUID: 3DsGAo9W4nWqu6YauAT-VPmQJZUO5oYE X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1117,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-09-15_04,2025-09-12_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 malwarescore=0 phishscore=0 suspectscore=0 spamscore=0 bulkscore=0 impostorscore=0 priorityscore=1501 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2507300000 definitions=main-2509130010 From: Aboorva Devarajan - Define accessor function get_boot_tb() to safely return boot_tb value, this is only needed when running in SPLPAR environments, so the accessor is built conditionally under CONFIG_PPC_SPLPAR. - Tag boot_tb as __ro_after_init since it is written once at initialized and never updated afterwards. Signed-off-by: Aboorva Devarajan --- Changelog: As suggested by Maddy, wrap boot_tb under CONFIG_PPC_SPLPAR arch/powerpc/include/asm/time.h | 4 ++++ arch/powerpc/kernel/time.c | 8 +++++++- 2 files changed, 11 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/include/asm/time.h b/arch/powerpc/include/asm/time.h index f8885586efaf..7991ab1d4cb8 100644 --- a/arch/powerpc/include/asm/time.h +++ b/arch/powerpc/include/asm/time.h @@ -29,6 +29,10 @@ extern u64 decrementer_max; extern void generic_calibrate_decr(void); +#ifdef CONFIG_PPC_SPLPAR +extern u64 get_boot_tb(void); +#endif + /* Some sane defaults: 125 MHz timebase, 1GHz processor */ extern unsigned long ppc_proc_freq; #define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8) diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c index 8224381c1dba..4bbeb8644d3d 100644 --- a/arch/powerpc/kernel/time.c +++ b/arch/powerpc/kernel/time.c @@ -137,7 +137,7 @@ EXPORT_SYMBOL_GPL(rtc_lock); static u64 tb_to_ns_scale __read_mostly; static unsigned tb_to_ns_shift __read_mostly; -static u64 boot_tb __read_mostly; +static u64 boot_tb __ro_after_init; extern struct timezone sys_tz; static long timezone_offset; @@ -639,6 +639,12 @@ notrace unsigned long long sched_clock(void) return mulhdu(get_tb() - boot_tb, tb_to_ns_scale) << tb_to_ns_shift; } +#ifdef CONFIG_PPC_SPLPAR +u64 get_boot_tb(void) +{ + return boot_tb; +} +#endif #ifdef CONFIG_PPC_PSERIES -- 2.47.1