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Mon, 12 Oct 2026 10:20:56 +0000 (GMT) Received: from li-7bb28a4c-2dab-11b2-a85c-887b5c60d769.ibm.com.com (unknown [9.124.215.77]) by smtpav04.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 12 Oct 2026 10:20:56 +0000 (GMT) From: Shrikanth Hegde To: maddy@linux.ibm.com, linuxppc-dev@lists.ozlabs.org, peterz@infradead.org, tim.c.chen@linux.intel.com Cc: sshegde@linux.ibm.com, christophe.leroy@csgroup.eu, linux-kernel@vger.kernel.org, ritesh.list@gmail.com, kprateek.nayak@amd.com, yu.c.chen@intel.com, vineethr@linux.ibm.com, vincent.guittot@linaro.org, srikar@linux.ibm.com, npiggin@gmail.com, mpe@ellerman.id.au Subject: [PATCH 3/4] powerpc/topology: Update mc/pkg flags based on llc_override Date: Mon, 12 Oct 2026 15:50:36 +0530 Message-ID: <20261012102037.2477378-4-sshegde@linux.ibm.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20261012102037.2477378-1-sshegde@linux.ibm.com> References: <20261012102037.2477378-1-sshegde@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Info: AW1haW4tMjYxMDEyMDA0MCBTYWx0ZWRfXz2RF04lXDzzZ QboL2M4XwEA8WwDDY/z+K2nNjV5hbyO04ximYVgdtlBSsbL0+GDwVy+YyxBMN5cgjYqpuvJIqm9 n4XIWT0QiihsCnBRTcxT37/e2nXeNV8= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDEyMDA0MCBTYWx0ZWRfXzj0fdkm9XAOS olazDlj2sslvWDITiVp0xgmLVyygY826zte+tw8Q2My7p4B0k5VrXrEx29Z2dJJOH9z96KdH7p6 rDUaUMjKi9+4qSzriH7NadASfOfjoOFHSJ51h3VU1lUuoR6uounzfI+lj+sl+MIGuQvRvTkv1Vu mWtiyjwAEPe0UCQeCi7W9U/peY4g60FqHgV+0CoYTkjDptb9wpuylg/CPWcvUnXpZGgWaLGxNSr e7SdE9S7rRuxilD1HwDN3D51PYaSTNHBgcMQXD2MqeF2cLTaj3xps/qF/ecaQtfnNigdf12QIm7 1wDy8nHQh8AKF14Q4MbyYikVvLDj+u6ANJXEaRbbVdLX7yc5hRnGw6t0TaTIpYn1F4E0Tujphbh 7hX4uyD6Cldfl6dsLLyNsdkffxV/ZVyM3/qtsKK4/PUI1f2XON55wM7cCtJxhgIK5exuIcxndLh FImgV7JpRGicRMfnwuQ== X-Authority-Analysis: v=2.4 cv=E6pYNqdl c=1 sm=1 tr=0 ts=6accb492 cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=XpzEG_ADxOFJZZFOhUYA:9 X-Proofpoint-ORIG-GUID: 2B0avF2aNIbRhpKQVidRoRIpP8m88ZtN X-Proofpoint-GUID: 3jVEwJ-BniKGkx4JeQw_VSQ905Dsguap X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-10-12_03,2026-10-09_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 phishscore=0 clxscore=1015 bulkscore=0 priorityscore=1501 spamscore=0 adultscore=0 suspectscore=0 malwarescore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610080000 definitions=main-2610120040 Update the flags passed for building the scheduler topology. SD_SHARE_LLC is used to determine the highest domain where the LLC is. Also when set at a particular domain, all the child domains are expected to have it set as well. Signed-off-by: Shrikanth Hegde --- arch/powerpc/kernel/smp.c | 63 +++++++++++++++++++++++++-------------- 1 file changed, 40 insertions(+), 23 deletions(-) diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c index 433757511adb..4b6512d25f73 100644 --- a/arch/powerpc/kernel/smp.c +++ b/arch/powerpc/kernel/smp.c @@ -141,6 +141,24 @@ volatile unsigned int cpu_callin_map[NR_CPUS]; int smt_enabled_at_boot = 1; +enum llc_override_values { + LLC_OVERRIDE_DISABLED, + LLC_OVERRIDE_SMT, + LLC_OVERRIDE_MC, + LLC_OVERRIDE_PKG, +}; + +static int llc_override; +static int llc_override_changed; +static DEFINE_MUTEX(llc_override_mutex); + +static const char * const llc_override_str[] = { + [LLC_OVERRIDE_DISABLED] = "0", + [LLC_OVERRIDE_SMT] = "smt", + [LLC_OVERRIDE_MC] = "mc", + [LLC_OVERRIDE_PKG] = "pkg", +}; + /* * Returns 1 if the specified cpu should be brought up during boot. * Used to inhibit booting threads if they've been disabled or @@ -1022,14 +1040,31 @@ static int powerpc_shared_cache_flags(void) return SD_SHARE_LLC; } -static int powerpc_shared_proc_flags(void) +static int powerpc_mc_flags(void) { + int flags = 0; + if (static_branch_unlikely(&splpar_asym_pack)) - return SD_ASYM_PACKING; + flags |= SD_ASYM_PACKING; - return 0; + if (READ_ONCE(llc_override) >= LLC_OVERRIDE_MC) + flags |= SD_SHARE_LLC; + + return flags; } +static int powerpc_pkg_flags(void) +{ + int flags = 0; + + if (static_branch_unlikely(&splpar_asym_pack)) + flags |= SD_ASYM_PACKING; + + if (READ_ONCE(llc_override) >= LLC_OVERRIDE_PKG) + flags |= SD_SHARE_LLC; + + return flags; +} /* * We can't just pass cpu_l2_cache_mask() directly because * returns a non-const pointer and the compiler barfs on that. @@ -1737,10 +1772,10 @@ static void __init build_sched_topology(void) if (has_coregroup_support()) { powerpc_topology[i++] = - SDTL_INIT(tl_mc_mask, powerpc_shared_proc_flags, MC); + SDTL_INIT(tl_mc_mask, powerpc_mc_flags, MC); } - powerpc_topology[i++] = SDTL_INIT(tl_pkg_mask, powerpc_shared_proc_flags, PKG); + powerpc_topology[i++] = SDTL_INIT(tl_pkg_mask, powerpc_pkg_flags, PKG); /* There must be one trailing NULL entry left. */ BUG_ON(i >= ARRAY_SIZE(powerpc_topology) - 1); @@ -1828,24 +1863,6 @@ void __noreturn arch_cpu_idle_dead(void) #endif -enum llc_override_values { - LLC_OVERRIDE_DISABLED, - LLC_OVERRIDE_SMT, - LLC_OVERRIDE_MC, - LLC_OVERRIDE_PKG, -}; - -static int llc_override; -static int llc_override_changed; -static DEFINE_MUTEX(llc_override_mutex); - -static const char * const llc_override_str[] = { - [LLC_OVERRIDE_DISABLED] = "0", - [LLC_OVERRIDE_SMT] = "smt", - [LLC_OVERRIDE_MC] = "mc", - [LLC_OVERRIDE_PKG] = "pkg", -}; - static ssize_t llc_override_get(struct file *file, char __user *ubuf, size_t count, loff_t *ppos) { -- 2.52.0