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Fri, 23 Oct 2026 13:16:59 +0000 (GMT) Received: from li-7bb28a4c-2dab-11b2-a85c-887b5c60d769.ibm.com.com (unknown [9.39.19.68]) by smtpav04.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 23 Oct 2026 13:16:58 +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 v2 2/4] powerpc/topology: Update mc/pkg flags based on llc_override Date: Fri, 23 Oct 2026 18:46:44 +0530 Message-ID: <20261023131646.2907938-3-sshegde@linux.ibm.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20261023131646.2907938-1-sshegde@linux.ibm.com> References: <20261023131646.2907938-1-sshegde@linux.ibm.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Info: AW1haW4tMjYxMDIzMDA1MSBTYWx0ZWRfXxERY1tWKn0+v 8sd6tDzPHQM2gpclGU5+sTzAJSPpc3uI/CrSI+Az02WKajeqclp9tQDswGfytR1BnfSQHAVrmW6 JLNiS7tZT+yQWvOgK76f+/BghKpSI+A= X-Proofpoint-GUID: 5y6n7_Heup1D1YasWgijgFrxl038pkBa X-Proofpoint-ORIG-GUID: JUoYXZoMBvrwcjJCs89X4RoLEkRPRirk X-Authority-Analysis: v=2.4 cv=UOBIjyfy c=1 sm=1 tr=0 ts=6adb5e54 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VnNF1IyMAAAA:8 a=T72vRSsYNOkmKreWw50A:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDIzMDA1MSBTYWx0ZWRfX5yrfH+qiyz2/ bNhRnpouui85tt313cpXuj2u5W/JsPeT20imOOBpU9/wUAK7nSpDjM+T35wC2U9f6KNwIWOJOxd sxg9S/XfC2YJlVOAOjXJqd7wJ8kAeB5I/sRibsQ4+tE0FFAuBnKkPRgtONMR/CVU/GSvUvAMWlZ RSJj+Sr7TM13W+KHZU1bIsTqqIfgrjESh+BuCfRCdq4gMuitTIrxYcFIF+kGHUf3qtG8J8BxlrN WVybsuAu40BaEGK985apuMS7W8ZeC7Xro+oAMhuMKSrirzTPsbb3ju8hKhibHIm2qbgCGJiA/9E TK+JbNTZ2TZ72jl/aKSckhW1xFd4XBZBDQhq0qQCQcVoHqUf/dw+Swn01Ut03/oXuNi3rCxdpjZ oZB4+suahTgz43IrAeTNS3+2TxLmv/PcoyV0vvwKlCkV6eamv6l2aQnSX7tOTlFY9atSA32ooYk IkgT7om7IOU5g6uHj2w== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-10-23_03,2026-10-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 clxscore=1015 suspectscore=0 spamscore=0 priorityscore=1501 lowpriorityscore=0 adultscore=0 impostorscore=0 bulkscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610190000 definitions=main-2610230051 Update the flags passed for building the scheduler topology based on llc_override. 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 | 41 +++++++++++++++++++++++++++------------ 1 file changed, 29 insertions(+), 12 deletions(-) diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c index 6b1201ea3572..ca1821dedc98 100644 --- a/arch/powerpc/kernel/smp.c +++ b/arch/powerpc/kernel/smp.c @@ -1007,6 +1007,12 @@ static int powerpc_smt_flags(void) */ static __ro_after_init DEFINE_STATIC_KEY_FALSE(splpar_asym_pack); +static int llc_override; +enum llc_override_values { + LLC_OVERRIDE_MC = 1, + LLC_OVERRIDE_PKG = 2, +}; + /* * P9 has a slightly odd architecture where pairs of cores share an L2 cache. * This topology makes it *much* cheaper to migrate tasks between adjacent cores @@ -1021,12 +1027,30 @@ 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; } /* @@ -1059,13 +1083,6 @@ static bool has_coregroup_support(void) return coregroup_enabled; } -enum llc_override_values { - LLC_OVERRIDE_MC = 1, - LLC_OVERRIDE_PKG = 2, -}; - -static int llc_override; - static int __init set_llc_override(char *str) { if (!strcasecmp(str, "mc") && has_coregroup_support()) @@ -1759,10 +1776,10 @@ 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); -- 2.52.0