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Wed, 12 Oct 2022 16:21:12 +0000 (GMT) Received: from li-c6ac47cc-293c-11b2-a85c-d421c8e4747b.ibm.com.com (unknown [9.171.34.168]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 12 Oct 2022 16:21:12 +0000 (GMT) From: Pierre Morel To: qemu-s390x@nongnu.org Cc: qemu-devel@nongnu.org, borntraeger@de.ibm.com, pasic@linux.ibm.com, richard.henderson@linaro.org, david@redhat.com, thuth@redhat.com, cohuck@redhat.com, mst@redhat.com, pbonzini@redhat.com, kvm@vger.kernel.org, ehabkost@redhat.com, marcel.apfelbaum@gmail.com, eblake@redhat.com, armbru@redhat.com, seiden@linux.ibm.com, nrb@linux.ibm.com, frankja@linux.ibm.com, berrange@redhat.com, clg@kaod.org Subject: [PATCH v10 1/9] s390x/cpu topology: core_id sets s390x CPU topology Date: Wed, 12 Oct 2022 18:20:59 +0200 Message-Id: <20221012162107.91734-2-pmorel@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20221012162107.91734-1-pmorel@linux.ibm.com> References: <20221012162107.91734-1-pmorel@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: 9z8ooe_UQu5-O0SioNGgVP5Xxpm0DGyY X-Proofpoint-GUID: zU5jus5cCIHpzCDKYYP4OYX4eaQ1uMRr X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-10-12_07,2022-10-12_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 bulkscore=0 mlxlogscore=999 malwarescore=0 suspectscore=0 phishscore=0 spamscore=0 impostorscore=0 adultscore=0 priorityscore=1501 clxscore=1015 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2209130000 definitions=main-2210120106 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org In the S390x CPU topology the core_id specifies the CPU address and the position of the core withing the topology. Let's build the topology based on the core_id. s390x/cpu topology: core_id sets s390x CPU topology In the S390x CPU topology the core_id specifies the CPU address and the position of the cpu withing the topology. Let's build the topology based on the core_id. Signed-off-by: Pierre Morel --- include/hw/s390x/cpu-topology.h | 45 +++++++++++ hw/s390x/cpu-topology.c | 132 ++++++++++++++++++++++++++++++++ hw/s390x/s390-virtio-ccw.c | 21 +++++ hw/s390x/meson.build | 1 + 4 files changed, 199 insertions(+) create mode 100644 include/hw/s390x/cpu-topology.h create mode 100644 hw/s390x/cpu-topology.c diff --git a/include/hw/s390x/cpu-topology.h b/include/hw/s390x/cpu-topology.h new file mode 100644 index 0000000000..66c171d0bc --- /dev/null +++ b/include/hw/s390x/cpu-topology.h @@ -0,0 +1,45 @@ +/* + * CPU Topology + * + * Copyright 2022 IBM Corp. + * + * This work is licensed under the terms of the GNU GPL, version 2 or (at + * your option) any later version. See the COPYING file in the top-level + * directory. + */ +#ifndef HW_S390X_CPU_TOPOLOGY_H +#define HW_S390X_CPU_TOPOLOGY_H + +#include "hw/qdev-core.h" +#include "qom/object.h" + +typedef struct S390TopoContainer { + int active_count; +} S390TopoContainer; + +#define S390_TOPOLOGY_CPU_IFL 0x03 +#define S390_TOPOLOGY_MAX_ORIGIN ((63 + S390_MAX_CPUS) / 64) +typedef struct S390TopoTLE { + uint64_t mask[S390_TOPOLOGY_MAX_ORIGIN]; +} S390TopoTLE; + +struct S390Topology { + SysBusDevice parent_obj; + int cpus; + S390TopoContainer *socket; + S390TopoTLE *tle; + MachineState *ms; +}; + +#define TYPE_S390_CPU_TOPOLOGY "s390-topology" +OBJECT_DECLARE_SIMPLE_TYPE(S390Topology, S390_CPU_TOPOLOGY) + +S390Topology *s390_get_topology(void); +void s390_topology_new_cpu(int core_id); + +static inline bool s390_has_topology(void) +{ + return false; +} + +#endif diff --git a/hw/s390x/cpu-topology.c b/hw/s390x/cpu-topology.c new file mode 100644 index 0000000000..42b22a1831 --- /dev/null +++ b/hw/s390x/cpu-topology.c @@ -0,0 +1,132 @@ +/* + * CPU Topology + * + * Copyright IBM Corp. 2022 + * Author(s): Pierre Morel + + * This work is licensed under the terms of the GNU GPL, version 2 or (at + * your option) any later version. See the COPYING file in the top-level + * directory. + */ + +#include "qemu/osdep.h" +#include "qapi/error.h" +#include "qemu/error-report.h" +#include "hw/sysbus.h" +#include "hw/qdev-properties.h" +#include "hw/boards.h" +#include "qemu/typedefs.h" +#include "target/s390x/cpu.h" +#include "hw/s390x/s390-virtio-ccw.h" +#include "hw/s390x/cpu-topology.h" + +S390Topology *s390_get_topology(void) +{ + static S390Topology *s390Topology; + + if (!s390Topology) { + s390Topology = S390_CPU_TOPOLOGY( + object_resolve_path(TYPE_S390_CPU_TOPOLOGY, NULL)); + } + + return s390Topology; +} + +/* + * s390_topology_new_cpu: + * @core_id: the core ID is machine wide + * + * The topology returned by s390_get_topology(), gives us the CPU + * topology established by the -smp QEMU aruments. + * The core-id gives: + * - the Container TLE (Topology List Entry) containing the CPU TLE. + * - in the CPU TLE the origin, or offset of the first bit in the core mask + * - the bit in the CPU TLE core mask + */ +void s390_topology_new_cpu(int core_id) +{ + S390Topology *topo = s390_get_topology(); + int socket_id; + int bit, origin; + + /* In the case no Topology is used nothing is to be done here */ + if (!topo) { + return; + } + + socket_id = core_id / topo->cpus; + + /* + * At the core level, each CPU is represented by a bit in a 64bit + * unsigned long which represent the presence of a CPU. + * The firmware assume that all CPU in a CPU TLE have the same + * type, polarization and are all dedicated or shared. + * In that case the origin variable represents the offset of the first + * CPU in the CPU container. + * More than 64 CPUs per socket are represented in several CPU containers + * inside the socket container. + * The only reason to have several S390TopologyCores inside a socket is + * to have more than 64 CPUs. + * In that case the origin variable represents the offset of the first CPU + * in the CPU container. More than 64 CPUs per socket are represented in + * several CPU containers inside the socket container. + */ + bit = core_id; + origin = bit / 64; + bit %= 64; + bit = 63 - bit; + + topo->socket[socket_id].active_count++; + set_bit(bit, &topo->tle[socket_id].mask[origin]); +} + +/** + * s390_topology_realize: + * @dev: the device state + * @errp: the error pointer (not used) + * + * During realize the machine CPU topology is initialized with the + * QEMU -smp parameters. + * The maximum count of CPU TLE in the all Topology can not be greater + * than the maximum CPUs. + */ +static void s390_topology_realize(DeviceState *dev, Error **errp) +{ + MachineState *ms = MACHINE(qdev_get_machine()); + S390Topology *topo = S390_CPU_TOPOLOGY(dev); + + topo->cpus = ms->smp.cores * ms->smp.threads; + + topo->socket = g_new0(S390TopoContainer, ms->smp.sockets); + topo->tle = g_new0(S390TopoTLE, ms->smp.max_cpus); + + topo->ms = ms; +} + +/** + * topology_class_init: + * @oc: Object class + * @data: (not used) + * + * A very simple object we will need for reset and migration. + */ +static void topology_class_init(ObjectClass *oc, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(oc); + + dc->realize = s390_topology_realize; + set_bit(DEVICE_CATEGORY_MISC, dc->categories); +} + +static const TypeInfo cpu_topology_info = { + .name = TYPE_S390_CPU_TOPOLOGY, + .parent = TYPE_SYS_BUS_DEVICE, + .instance_size = sizeof(S390Topology), + .class_init = topology_class_init, +}; + +static void topology_register(void) +{ + type_register_static(&cpu_topology_info); +} +type_init(topology_register); diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c index 03855c7231..aa99a62e42 100644 --- a/hw/s390x/s390-virtio-ccw.c +++ b/hw/s390x/s390-virtio-ccw.c @@ -43,6 +43,7 @@ #include "sysemu/sysemu.h" #include "hw/s390x/pv.h" #include "migration/blocker.h" +#include "hw/s390x/cpu-topology.h" static Error *pv_mig_blocker; @@ -94,6 +95,18 @@ static void s390_init_cpus(MachineState *machine) } } +static void s390_init_topology(MachineState *machine) +{ + DeviceState *dev; + + if (s390_has_topology()) { + dev = qdev_new(TYPE_S390_CPU_TOPOLOGY); + object_property_add_child(&machine->parent_obj, + TYPE_S390_CPU_TOPOLOGY, OBJECT(dev)); + sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal); + } +} + static const char *const reset_dev_types[] = { TYPE_VIRTUAL_CSS_BRIDGE, "s390-sclp-event-facility", @@ -244,6 +257,9 @@ static void ccw_init(MachineState *machine) /* init memory + setup max page size. Required for the CPU model */ s390_memory_init(machine->ram); + /* Adding the topology must be done before CPU intialization */ + s390_init_topology(machine); + /* init CPUs (incl. CPU model) early so s390_has_feature() works */ s390_init_cpus(machine); @@ -306,6 +322,11 @@ static void s390_cpu_plug(HotplugHandler *hotplug_dev, g_assert(!ms->possible_cpus->cpus[cpu->env.core_id].cpu); ms->possible_cpus->cpus[cpu->env.core_id].cpu = OBJECT(dev); + /* Inserting the CPU in the Topology can not fail */ + if (s390_has_topology()) { + s390_topology_new_cpu(cpu->env.core_id); + } + if (dev->hotplugged) { raise_irq_cpu_hotplug(); } diff --git a/hw/s390x/meson.build b/hw/s390x/meson.build index f291016fee..653f6ab488 100644 --- a/hw/s390x/meson.build +++ b/hw/s390x/meson.build @@ -2,6 +2,7 @@ s390x_ss = ss.source_set() s390x_ss.add(files( 'ap-bridge.c', 'ap-device.c', + 'cpu-topology.c', 'ccw-device.c', 'css-bridge.c', 'css.c', -- 2.31.1