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Mon, 10 Nov 2025 17:02:48 +0000 (GMT) Message-ID: <53fd537b-5549-427f-ad7d-28d58daaa5bd@linux.ibm.com> Date: Mon, 10 Nov 2025 22:32:48 +0530 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 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] powerpc/smp: Expose die_id and die_cpumask To: Srikar Dronamraju , linuxppc-dev@lists.ozlabs.org Cc: Christophe Leroy , linux-kernel@vger.kernel.org, Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Peter Zijlstra , Thomas Gleixner References: <20251028105734.1894998-1-srikar@linux.ibm.com> From: Shrikanth Hegde Content-Language: en-US In-Reply-To: <20251028105734.1894998-1-srikar@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: yLdmRwN_1XDHZT-_nq1UmgV_rjsezNAX X-Proofpoint-ORIG-GUID: NOMlJ4g_SXKRAtFtr-oSaoY6o5BGSuSL X-Authority-Analysis: v=2.4 cv=VMPQXtPX c=1 sm=1 tr=0 ts=69121ac1 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=IkcTkHD0fZMA:10 a=6UeiqGixMTsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VnNF1IyMAAAA:8 a=XNNoshNgl4cG0apxiokA:9 a=QEXdDO2ut3YA:10 a=cPQSjfK2_nFv0Q5t_7PE:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTA4MDAyMiBTYWx0ZWRfXy5G8w2FTlkBB rxFV9nPA06JStMZn6WJg8Z/kQarDfSyi7ixSLwq5ksuwxENpxf8YYeb16EeVTNeTv2GkRgUFXMO LKWf3wSDjY8+oE8R3YGKMJULeRcyCk2tNFLF+LLSQpeE3KFYEKen9TdgqDSITDDdJmix/niOCBj tjTN2bfIFecmgu85cfT3YKyZA7u0slnCNQPpraNQ3ZP7MS5Qx0WKeDdG6fjO9uHII/bCdayYsar t7+EJ0H1eYRJtgw2fabypiZRoJQxV4GfD8aS1i51ztwl6sg0nRetHgw15SRlBtrssH79X8i6R4C GCooVXrbl0ozDrqpS1k6aYnOb1PbLc2eOv7mU+SKBYwXewIL3V1lmq8zuzjXFemxe9dNm15jl+7 NoemuTDM7GVf50p/p9FrpY2+Zu2NqQ== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-11-10_06,2025-11-10_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 priorityscore=1501 lowpriorityscore=0 bulkscore=0 clxscore=1015 phishscore=0 spamscore=0 malwarescore=0 adultscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510240000 definitions=main-2511080022 > > Without this change. > $ grep . /sys/devices/system/cpu/cpu8/topology/{die*,package*} 2> /dev/null > /sys/devices/system/cpu/cpu8/topology/package_cpus:0000,ffffff00 > /sys/devices/system/cpu/cpu8/topology/package_cpus_list:8-31 > > With this change. > $ grep . /sys/devices/system/cpu/cpu8/topology/{die*,package*} 2> /dev/null > /sys/devices/system/cpu/cpu8/topology/die_cpus:0000,0000ff00 > /sys/devices/system/cpu/cpu8/topology/die_cpus_list:8-15 > /sys/devices/system/cpu/cpu8/topology/die_id:4 > /sys/devices/system/cpu/cpu8/topology/package_cpus:0000,ffffff00 > /sys/devices/system/cpu/cpu8/topology/package_cpus_list:8-31 > > snipped lstopo-no-graphics o/p > Group0 L#0 > Package L#1 > NUMANode L#1 (P#2 8135MB) > Die L#0 + Core L#1 Die L#0 -> Here L# indicates logical die number. One should run --verbose to see theactual die_id. For example: Die L#8 (P#25) --> die_id is 25. Maybe you could the same CPU's (CPU8) info of lstopo here? > L3 L#2 (4096KB) + L2 L#2 (1024KB) + L1d L#2 (32KB) + L1i L#2 (48KB) > PU L#8 (P#8) > > Signed-off-by: Srikar Dronamraju > --- > arch/powerpc/include/asm/topology.h | 4 ++++ > arch/powerpc/kernel/smp.c | 18 ++++++++++++++++++ > 2 files changed, 22 insertions(+) > > diff --git a/arch/powerpc/include/asm/topology.h b/arch/powerpc/include/asm/topology.h > index f19ca44512d1..c6ad1eb7e44a 100644 > --- a/arch/powerpc/include/asm/topology.h > +++ b/arch/powerpc/include/asm/topology.h > @@ -132,6 +132,8 @@ static inline int cpu_to_coregroup_id(int cpu) > #include > > struct cpumask *cpu_coregroup_mask(int cpu); > +const struct cpumask *cpu_die_mask(int cpu); > +int cpu_die_id(int cpu); > > #ifdef CONFIG_PPC64 > #include > @@ -141,6 +143,8 @@ struct cpumask *cpu_coregroup_mask(int cpu); > #define topology_sibling_cpumask(cpu) (per_cpu(cpu_sibling_map, cpu)) > #define topology_core_cpumask(cpu) (per_cpu(cpu_core_map, cpu)) > #define topology_core_id(cpu) (cpu_to_core_id(cpu)) > +#define topology_die_id(cpu) (cpu_die_id(cpu)) > +#define topology_die_cpumask(cpu) (cpu_die_mask(cpu)) > nit: can we fix the tab spacing here please? Maybe like below? +#define topology_sibling_cpumask(cpu) (per_cpu(cpu_sibling_map, cpu)) +#define topology_core_cpumask(cpu) (per_cpu(cpu_core_map, cpu)) +#define topology_core_id(cpu) (cpu_to_core_id(cpu)) +#define topology_die_id(cpu) (cpu_die_id(cpu)) +#define topology_die_cpumask(cpu) (cpu_die_mask(cpu)) > #endif > #endif > diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c > index 68edb66c2964..a0b0b46b78e3 100644 > --- a/arch/powerpc/kernel/smp.c > +++ b/arch/powerpc/kernel/smp.c > @@ -1085,6 +1085,24 @@ static int __init init_big_cores(void) > return 0; > } > As you have mentioned in the changelog, could you add a comment here explaining on which systems we see this information correctly. > +const struct cpumask *cpu_die_mask(int cpu) > +{ > + if (has_coregroup_support()) > + return per_cpu(cpu_coregroup_map, cpu); > + else > + return cpu_node_mask(cpu); > +} > +EXPORT_SYMBOL_GPL(cpu_die_mask); > + > +int cpu_die_id(int cpu) > +{ > + if (has_coregroup_support()) > + return cpu_to_coregroup_id(cpu); > + else > + return -1; > +} > +EXPORT_SYMBOL_GPL(cpu_die_id); > + > void __init smp_prepare_cpus(unsigned int max_cpus) > { > unsigned int cpu, num_threads; Other than above: Reviewed-by: Shrikanth Hegde