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Fri, 15 Aug 2025 08:34:39 +0000 (GMT) From: Athira Rajeev To: acme@kernel.org, jolsa@kernel.org, adrian.hunter@intel.com, maddy@linux.ibm.com, irogers@google.com, namhyung@kernel.org Cc: linux-perf-users@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, aboorvad@linux.ibm.com, sshegde@linux.ibm.com, atrajeev@linux.ibm.com, kjain@linux.ibm.com, hbathini@linux.vnet.ibm.com, Aditya.Bodkhe1@ibm.com, venkat88@linux.ibm.com Subject: [PATCH 01/14] powerpc/time: Expose boot_tb via accessor Date: Fri, 15 Aug 2025 14:03:54 +0530 Message-Id: <20250815083407.27953-2-atrajeev@linux.ibm.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) In-Reply-To: <20250815083407.27953-1-atrajeev@linux.ibm.com> References: <20250815083407.27953-1-atrajeev@linux.ibm.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwODEyMDIyNCBTYWx0ZWRfXxpGfBEVnldVv ZZiHoDsXuhL1hoj6RAb6W+gR+v8Ef/UELJ6f22uqpXcCMo8PKDv4apD9B/3MzFWW3NNxhRfr5XS jkr8F9rm9Fk31ksA2QxbxNj5tlCtvhhhmU/JUmpg+wKYy2mvmztnmCfuCoNh3i2Q961OIVNfdV+ j2ufYPibaM3/0otD7bUxzDQMABiVjjLlO8BAc8Bm7kvmayKentQRTq3b+39/GwU2cGo0+3gR1XB F1st/937raLlk8Id+bTBU5Nj9Z5BEzJHQdWULBe/8GcVHKU6P56eau3q/uxwqp3H0pWdeyptPlv Ei5+D3SJu2VEyMJX2oxd2/yvF3VeVOXGO4KKmvTenJf4iHS1x5SJ08GUxKR1cykKm447z/pOfPp ZyqHt9Yq X-Authority-Analysis: v=2.4 cv=d/31yQjE c=1 sm=1 tr=0 ts=689ef12c cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=2OwXVqhp2XgA:10 a=VnNF1IyMAAAA:8 a=cbn_3OFnJLNrDsZptFIA:9 X-Proofpoint-GUID: ZE1n8gch3M1mksOu52Dm0U5QSkXPY0jm X-Proofpoint-ORIG-GUID: UJQGR8pLVHBPZo5cmk7cJWWOtGW0Yrf_ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-08-15_02,2025-08-14_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1011 suspectscore=0 impostorscore=0 priorityscore=1501 phishscore=0 spamscore=0 adultscore=0 bulkscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2507300000 definitions=main-2508120224 From: Aboorva Devarajan - Define accessor function get_boot_tb() to safely return boot_tb. - Tag boot_tb as __ro_after_init (only initialized once and never updated). - Add a debug log to output the boot timebase during initialization. Signed-off-by: Aboorva Devarajan --- arch/powerpc/include/asm/time.h | 2 ++ arch/powerpc/kernel/time.c | 7 ++++++- 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/include/asm/time.h b/arch/powerpc/include/asm/time.h index f8885586efaf..31bb6be4d355 100644 --- a/arch/powerpc/include/asm/time.h +++ b/arch/powerpc/include/asm/time.h @@ -29,6 +29,8 @@ extern u64 decrementer_max; extern void generic_calibrate_decr(void); +extern u64 get_boot_tb(void); + /* 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..f5106b90e517 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 +639,10 @@ notrace unsigned long long sched_clock(void) return mulhdu(get_tb() - boot_tb, tb_to_ns_scale) << tb_to_ns_shift; } +u64 get_boot_tb(void) +{ + return boot_tb; +} #ifdef CONFIG_PPC_PSERIES @@ -975,6 +979,7 @@ void __init time_init(void) tb_to_ns_shift = shift; /* Save the current timebase to pretty up CONFIG_PRINTK_TIME */ boot_tb = get_tb(); + pr_debug("%s: timebase at boot: %llu\n", __func__, (unsigned long long)boot_tb); /* If platform provided a timezone (pmac), we correct the time */ if (timezone_offset) { -- 2.47.1