[PATCH v9 04/10] hw/core: introducing drawer and books for s390x

[Pierre Morel <pmorel@linux.ibm.com>]

S390x defines two topology levels above sockets: nbooks and drawers.

Let's add these two levels inside the CPU topology implementation.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
---
 hw/core/machine-smp.c | 48 ++++++++++++++++++++++++++++++++++++-------
 hw/core/machine.c     |  4 ++++
 include/hw/boards.h   |  8 ++++++++
 qapi/machine.json     | 14 +++++++++++--
 qemu-options.hx       |  6 ++++--
 softmmu/vl.c          |  6 ++++++
 6 files changed, 75 insertions(+), 11 deletions(-)

diff --git a/hw/core/machine-smp.c b/hw/core/machine-smp.c
index b39ed21e65..26150c748f 100644
--- a/hw/core/machine-smp.c
+++ b/hw/core/machine-smp.c
@@ -31,6 +31,14 @@ static char *cpu_hierarchy_to_string(MachineState *ms)
     MachineClass *mc = MACHINE_GET_CLASS(ms);
     GString *s = g_string_new(NULL);
 
+    if (mc->smp_props.drawers_supported) {
+        g_string_append_printf(s, " * drawers (%u)", ms->smp.drawers);
+    }
+
+    if (mc->smp_props.books_supported) {
+        g_string_append_printf(s, " * books (%u)", ms->smp.books);
+    }
+
     g_string_append_printf(s, "sockets (%u)", ms->smp.sockets);
 
     if (mc->smp_props.dies_supported) {
@@ -73,6 +81,8 @@ void machine_parse_smp_config(MachineState *ms,
 {
     MachineClass *mc = MACHINE_GET_CLASS(ms);
     unsigned cpus    = config->has_cpus ? config->cpus : 0;
+    unsigned drawers = config->has_drawers ? config->drawers : 0;
+    unsigned books   = config->has_books ? config->books : 0;
     unsigned sockets = config->has_sockets ? config->sockets : 0;
     unsigned dies    = config->has_dies ? config->dies : 0;
     unsigned clusters = config->has_clusters ? config->clusters : 0;
@@ -85,6 +95,8 @@ void machine_parse_smp_config(MachineState *ms,
      * explicit configuration like "cpus=0" is not allowed.
      */
     if ((config->has_cpus && config->cpus == 0) ||
+        (config->has_drawers && config->drawers == 0) ||
+        (config->has_books && config->books == 0) ||
         (config->has_sockets && config->sockets == 0) ||
         (config->has_dies && config->dies == 0) ||
         (config->has_clusters && config->clusters == 0) ||
@@ -111,6 +123,20 @@ void machine_parse_smp_config(MachineState *ms,
     dies = dies > 0 ? dies : 1;
     clusters = clusters > 0 ? clusters : 1;
 
+    if (!mc->smp_props.books_supported && books > 1) {
+        error_setg(errp, "books not supported by this machine's CPU topology");
+        return;
+    }
+
+    books = books > 0 ? books : 1;
+
+    if (!mc->smp_props.drawers_supported && drawers > 1) {
+        error_setg(errp, "drawers not supported by this machine's CPU topology");
+        return;
+    }
+
+    drawers = drawers > 0 ? drawers : 1;
+
     /* compute missing values based on the provided ones */
     if (cpus == 0 && maxcpus == 0) {
         sockets = sockets > 0 ? sockets : 1;
@@ -124,33 +150,41 @@ void machine_parse_smp_config(MachineState *ms,
             if (sockets == 0) {
                 cores = cores > 0 ? cores : 1;
                 threads = threads > 0 ? threads : 1;
-                sockets = maxcpus / (dies * clusters * cores * threads);
+                sockets = maxcpus /
+                          (drawers * books * dies * clusters * cores * threads);
             } else if (cores == 0) {
                 threads = threads > 0 ? threads : 1;
-                cores = maxcpus / (sockets * dies * clusters * threads);
+                cores = maxcpus /
+                        (drawers * books * sockets * dies * clusters * threads);
             }
         } else {
             /* prefer cores over sockets since 6.2 */
             if (cores == 0) {
                 sockets = sockets > 0 ? sockets : 1;
                 threads = threads > 0 ? threads : 1;
-                cores = maxcpus / (sockets * dies * clusters * threads);
+                cores = maxcpus /
+                        (drawers * books * sockets * dies * clusters * threads);
             } else if (sockets == 0) {
                 threads = threads > 0 ? threads : 1;
-                sockets = maxcpus / (dies * clusters * cores * threads);
+                sockets = maxcpus /
+                         (drawers * books * dies * clusters * cores * threads);
             }
         }
 
         /* try to calculate omitted threads at last */
         if (threads == 0) {
-            threads = maxcpus / (sockets * dies * clusters * cores);
+            threads = maxcpus /
+                      (drawers * books * sockets * dies * clusters * cores);
         }
     }
 
-    maxcpus = maxcpus > 0 ? maxcpus : sockets * dies * clusters * cores * threads;
+    maxcpus = maxcpus > 0 ? maxcpus : drawers * books * sockets * dies *
+                                      clusters * cores * threads;
     cpus = cpus > 0 ? cpus : maxcpus;
 
     ms->smp.cpus = cpus;
+    ms->smp.drawers = drawers;
+    ms->smp.books = books;
     ms->smp.sockets = sockets;
     ms->smp.dies = dies;
     ms->smp.clusters = clusters;
@@ -159,7 +193,7 @@ void machine_parse_smp_config(MachineState *ms,
     ms->smp.max_cpus = maxcpus;
 
     /* sanity-check of the computed topology */
-    if (sockets * dies * clusters * cores * threads != maxcpus) {
+    if (drawers * books * sockets * dies * clusters * cores * threads != maxcpus) {
         g_autofree char *topo_msg = cpu_hierarchy_to_string(ms);
         error_setg(errp, "Invalid CPU topology: "
                    "product of the hierarchy must match maxcpus: "
diff --git a/hw/core/machine.c b/hw/core/machine.c
index a673302cce..4c5c8d1655 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -821,6 +821,8 @@ static void machine_get_smp(Object *obj, Visitor *v, const char *name,
     MachineState *ms = MACHINE(obj);
     SMPConfiguration *config = &(SMPConfiguration){
         .has_cpus = true, .cpus = ms->smp.cpus,
+        .has_drawers = true, .drawers = ms->smp.drawers,
+        .has_books = true, .books = ms->smp.books,
         .has_sockets = true, .sockets = ms->smp.sockets,
         .has_dies = true, .dies = ms->smp.dies,
         .has_clusters = true, .clusters = ms->smp.clusters,
@@ -1087,6 +1089,8 @@ static void machine_initfn(Object *obj)
     /* default to mc->default_cpus */
     ms->smp.cpus = mc->default_cpus;
     ms->smp.max_cpus = mc->default_cpus;
+    ms->smp.drawers = 1;
+    ms->smp.books = 1;
     ms->smp.sockets = 1;
     ms->smp.dies = 1;
     ms->smp.clusters = 1;
diff --git a/include/hw/boards.h b/include/hw/boards.h
index 7b416c9787..69e20c1252 100644
--- a/include/hw/boards.h
+++ b/include/hw/boards.h
@@ -130,11 +130,15 @@ typedef struct {
  * @prefer_sockets - whether sockets are preferred over cores in smp parsing
  * @dies_supported - whether dies are supported by the machine
  * @clusters_supported - whether clusters are supported by the machine
+ * @books_supported - whether books are supported by the machine
+ * @drawers_supported - whether drawers are supported by the machine
  */
 typedef struct {
     bool prefer_sockets;
     bool dies_supported;
     bool clusters_supported;
+    bool books_supported;
+    bool drawers_supported;
 } SMPCompatProps;
 
 /**
@@ -299,6 +303,8 @@ typedef struct DeviceMemoryState {
 /**
  * CpuTopology:
  * @cpus: the number of present logical processors on the machine
+ * @drawers: the number of drawers on the machine
+ * @books: the number of books on the machine
  * @sockets: the number of sockets on the machine
  * @dies: the number of dies in one socket
  * @clusters: the number of clusters in one die
@@ -308,6 +314,8 @@ typedef struct DeviceMemoryState {
  */
 typedef struct CpuTopology {
     unsigned int cpus;
+    unsigned int drawers;
+    unsigned int books;
     unsigned int sockets;
     unsigned int dies;
     unsigned int clusters;
diff --git a/qapi/machine.json b/qapi/machine.json
index 6afd1936b0..bdd92e3cb1 100644
--- a/qapi/machine.json
+++ b/qapi/machine.json
@@ -900,13 +900,15 @@
 # a CPU is being hotplugged.
 #
 # @node-id: NUMA node ID the CPU belongs to
-# @socket-id: socket number within node/board the CPU belongs to
+# @drawer-id: drawer number within node/board the CPU belongs to
+# @book-id: book number within drawer/node/board the CPU belongs to
+# @socket-id: socket number within book/node/board the CPU belongs to
 # @die-id: die number within socket the CPU belongs to (since 4.1)
 # @cluster-id: cluster number within die the CPU belongs to (since 7.1)
 # @core-id: core number within cluster the CPU belongs to
 # @thread-id: thread number within core the CPU belongs to
 #
-# Note: currently there are 6 properties that could be present
+# Note: currently there are 7 properties that could be present
 #       but management should be prepared to pass through other
 #       properties with device_add command to allow for future
 #       interface extension. This also requires the filed names to be kept in
@@ -916,6 +918,8 @@
 ##
 { 'struct': 'CpuInstanceProperties',
   'data': { '*node-id': 'int',
+            '*drawer-id': 'int',
+            '*book-id': 'int',
             '*socket-id': 'int',
             '*die-id': 'int',
             '*cluster-id': 'int',
@@ -1465,6 +1469,10 @@
 #
 # @cpus: number of virtual CPUs in the virtual machine
 #
+# @drawers: number of drawers in the CPU topology
+#
+# @books: number of books in the CPU topology
+#
 # @sockets: number of sockets in the CPU topology
 #
 # @dies: number of dies per socket in the CPU topology
@@ -1481,6 +1489,8 @@
 ##
 { 'struct': 'SMPConfiguration', 'data': {
      '*cpus': 'int',
+     '*drawers': 'int',
+     '*books': 'int',
      '*sockets': 'int',
      '*dies': 'int',
      '*clusters': 'int',
diff --git a/qemu-options.hx b/qemu-options.hx
index 311e75a98e..e78e51ab49 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -245,11 +245,13 @@ SRST
 ERST
 
 DEF("smp", HAS_ARG, QEMU_OPTION_smp,
-    "-smp [[cpus=]n][,maxcpus=maxcpus][,sockets=sockets][,dies=dies][,clusters=clusters][,cores=cores][,threads=threads]\n"
+    "-smp [[cpus=]n][,maxcpus=maxcpus][,drawers=drawers][,books=books][,sockets=sockets][,dies=dies][,clusters=clusters][,cores=cores][,threads=threads]\n"
     "                set the number of initial CPUs to 'n' [default=1]\n"
     "                maxcpus= maximum number of total CPUs, including\n"
     "                offline CPUs for hotplug, etc\n"
-    "                sockets= number of sockets on the machine board\n"
+    "                drawers= number of drawers on the machine board\n"
+    "                books= number of books in one drawer\n"
+    "                sockets= number of sockets in one book\n"
     "                dies= number of dies in one socket\n"
     "                clusters= number of clusters in one die\n"
     "                cores= number of cores in one cluster\n"
diff --git a/softmmu/vl.c b/softmmu/vl.c
index 706bd7cff7..80ea35fa26 100644
--- a/softmmu/vl.c
+++ b/softmmu/vl.c
@@ -726,6 +726,12 @@ static QemuOptsList qemu_smp_opts = {
         {
             .name = "cpus",
             .type = QEMU_OPT_NUMBER,
+        }, {
+            .name = "drawers",
+            .type = QEMU_OPT_NUMBER,
+        }, {
+            .name = "books",
+            .type = QEMU_OPT_NUMBER,
         }, {
             .name = "sockets",
             .type = QEMU_OPT_NUMBER,
-- 
2.31.1