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Fri, 5 Jun 2026 05:53:39 +0000 (GMT) From: Srikar Dronamraju To: linuxppc-dev , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Naveen N Rao Cc: skiboot@lists.ozlabs.org, arbab@linux.ibm.com, mahesh@linux.ibm.com, chleroy@kernel.org, Srikar Dronamraju , linux-kernel@vger.kernel.org Subject: [PATCH v2 2/3] powerpc/numa: Allow cpu_to_coregroup_id without PPC_SPLPAR Date: Fri, 5 Jun 2026 11:22:45 +0530 Message-ID: <20260605055242.1757485-7-srikar@linux.ibm.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260605055242.1757485-5-srikar@linux.ibm.com> References: <20260605055242.1757485-5-srikar@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-GUID: NBfCI9doDRElpU2QTN54b_z3e2kdR5ya X-Authority-Analysis: v=2.4 cv=fv/sol4f c=1 sm=1 tr=0 ts=6a22646b cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=FelO9ux0wxsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=7dv0z3e6AKYFnwaEaUMA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjA1MDA1MSBTYWx0ZWRfX5mHqZ+CilHlQ J5Hn0qBzZqTB9hEiwIpcZYHrhmxBk6P/4Hie6nUUTgye1Zqt7eAecQ6QcRnEM0Kp7mVL0ONF87l 1F21Sxl/WzXge9oCS3pWY142Z2Pv2ngWTQ/OemayglbMdcY4RQl2wur0giT1esiHyAHqqCKSPm+ gn8qyHW4ben4TcblISUBdjUmms5/s8NSZYZVM7XEQK6sP6RjWaCJwIN8vrr0ytCcxzygdPuj0Qn UOMpmAE+Px1llhgHYJqtJ0G43I/HG2jADeTqF+xsHEREqosKJz2CepU03h3sQSww8lLTPDdL3FR A81cxStY9ZomzygpyZsv4qzwSFp0PBPPKWzq1Xi5Nm8Hr1WA5Cl9yLIA32CVH9fDG7IsySNR694 0QVsn+nnGVNRG05QXALaNJo9cxECRtR7SNTRAW2Su+vVLkq4SFfqWJOF3Ok8iHFEEkT38OXHhR1 VwyGdvSmSo/1sEMZHlw== X-Proofpoint-ORIG-GUID: mw09OxhhgdyXAgOUoLbGUcqrHSmznLln X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-04_07,2026-05-28_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 priorityscore=1501 spamscore=0 phishscore=0 clxscore=1015 impostorscore=0 suspectscore=0 bulkscore=0 lowpriorityscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605210000 definitions=main-2606050051 Make cpu_to_coregroup_id() available outside PPC_SPLPAR so it can be used by platforms that do not rely on the SPLPAR-specific VPHN path. Keep the existing fallback behavior by returning the core ID when coregroup information is unavailable. Signed-off-by: Srikar Dronamraju --- Changelog from v1: - Handle comments from Christophe Leroy; Remove extern key word in declaration arch/powerpc/include/asm/topology.h | 15 +++++++-------- arch/powerpc/mm/numa.c | 22 ++++++++++++++++------ 2 files changed, 23 insertions(+), 14 deletions(-) diff --git a/arch/powerpc/include/asm/topology.h b/arch/powerpc/include/asm/topology.h index 66ed5fe1b718..385715f1ad56 100644 --- a/arch/powerpc/include/asm/topology.h +++ b/arch/powerpc/include/asm/topology.h @@ -71,6 +71,7 @@ extern void map_cpu_to_node(int cpu, int node); extern void unmap_cpu_from_node(unsigned long cpu); #endif /* CONFIG_HOTPLUG_CPU */ +int cpu_to_coregroup_id(int cpu); #else static inline int early_cpu_to_node(int cpu) { return 0; } @@ -107,14 +108,6 @@ static inline void map_cpu_to_node(int cpu, int node) {} static inline void unmap_cpu_from_node(unsigned long cpu) {} #endif /* CONFIG_HOTPLUG_CPU */ #endif /* CONFIG_SMP */ - -#endif /* CONFIG_NUMA */ - -#if defined(CONFIG_NUMA) && defined(CONFIG_PPC_SPLPAR) -void find_and_update_cpu_nid(int cpu); -extern int cpu_to_coregroup_id(int cpu); -#else -static inline void find_and_update_cpu_nid(int cpu) {} static inline int cpu_to_coregroup_id(int cpu) { #ifdef CONFIG_SMP @@ -124,6 +117,12 @@ static inline int cpu_to_coregroup_id(int cpu) #endif } +#endif /* CONFIG_NUMA */ + +#if defined(CONFIG_NUMA) && defined(CONFIG_PPC_SPLPAR) +void find_and_update_cpu_nid(int cpu); +#else +static inline void find_and_update_cpu_nid(int cpu) {} #endif /* CONFIG_NUMA && CONFIG_PPC_SPLPAR */ #include diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c index c44a80d8fc11..9aa71eb7e96b 100644 --- a/arch/powerpc/mm/numa.c +++ b/arch/powerpc/mm/numa.c @@ -1428,6 +1428,21 @@ void find_and_update_cpu_nid(int cpu) pr_debug("%s:%d cpu %d nid %d\n", __func__, __LINE__, cpu, new_nid); } +static int topology_update_init(void) +{ + topology_inited = 1; + return 0; +} +device_initcall(topology_update_init); + +#else +static long vphn_get_associativity(unsigned long cpu, + __be32 *associativity) +{ + return -1; +} +#endif /* CONFIG_PPC_SPLPAR */ + int cpu_to_coregroup_id(int cpu) { __be32 associativity[VPHN_ASSOC_BUFSIZE] = {0}; @@ -1453,10 +1468,5 @@ int cpu_to_coregroup_id(int cpu) return cpu_to_core_id(cpu); } -static int topology_update_init(void) -{ - topology_inited = 1; - return 0; + return coregroup_id; } -device_initcall(topology_update_init); -#endif /* CONFIG_PPC_SPLPAR */ -- 2.43.0