[PATCH for-6.2 v2 10/11] machine: Split out the smp parsing code

[Yanan Wang <wangyanan55@huawei.com>]

We are going to introduce an unit test for the parser smp_parse()
in hw/core/machine.c, but now machine.c is only built in softmmu.

In order to solve the build dependency on the smp parsing code and
avoid building unrelated stuff for the unit tests, move the related
code from machine.c into a new common file, i.e., machine-smp.c.

Signed-off-by: Yanan Wang <wangyanan55@huawei.com>
---
 MAINTAINERS           |   1 +
 hw/core/machine-smp.c | 124 ++++++++++++++++++++++++++++++++++++++++++
 hw/core/machine.c     | 109 -------------------------------------
 hw/core/meson.build   |   1 +
 include/hw/boards.h   |   1 +
 5 files changed, 127 insertions(+), 109 deletions(-)
 create mode 100644 hw/core/machine-smp.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 9100f9a043..70633e3bf4 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1626,6 +1626,7 @@ F: cpu.c
 F: hw/core/cpu.c
 F: hw/core/machine-qmp-cmds.c
 F: hw/core/machine.c
+F: hw/core/machine-smp.c
 F: hw/core/null-machine.c
 F: hw/core/numa.c
 F: hw/cpu/cluster.c
diff --git a/hw/core/machine-smp.c b/hw/core/machine-smp.c
new file mode 100644
index 0000000000..6a00cfe44a
--- /dev/null
+++ b/hw/core/machine-smp.c
@@ -0,0 +1,124 @@
+/*
+ * QEMU Machine (related to SMP configuration)
+ *
+ * Copyright (C) 2014 Red Hat Inc
+ *
+ * Authors:
+ *   Marcel Apfelbaum <marcel.a@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/boards.h"
+#include "qapi/error.h"
+
+/*
+ * smp_parse - Generic function used to parse the given SMP configuration
+ *
+ * The topology parameters must be specified equal to or great than one
+ * or just omitted, explicit configuration like "cpus=0" is not allowed.
+ * The omitted parameters will be calculated based on the provided ones.
+ *
+ * maxcpus will default to the value of cpus if omitted and will be used
+ * to compute the missing sockets/cores/threads. cpus will be calculated
+ * from the computed parametrs if omitted.
+ *
+ * In calculation of omitted arch-netural sockets/cores/threads, we prefer
+ * sockets over cores over threads before 6.2, while prefer cores over
+ * sockets over threads since 6.2 on. The arch-specific dies will directly
+ * default to 1 if omitted.
+ */
+void smp_parse(MachineState *ms, SMPConfiguration *config, Error **errp)
+{
+    MachineClass *mc = MACHINE_GET_CLASS(ms);
+    unsigned cpus    = config->has_cpus ? config->cpus : 0;
+    unsigned sockets = config->has_sockets ? config->sockets : 0;
+    unsigned dies    = config->has_dies ? config->dies : 1;
+    unsigned cores   = config->has_cores ? config->cores : 0;
+    unsigned threads = config->has_threads ? config->threads : 0;
+    unsigned maxcpus = config->has_maxcpus ? config->maxcpus : 0;
+
+    if ((config->has_cpus && config->cpus == 0) ||
+        (config->has_sockets && config->sockets == 0) ||
+        (config->has_dies && config->dies == 0) ||
+        (config->has_cores && config->cores == 0) ||
+        (config->has_threads && config->threads == 0) ||
+        (config->has_maxcpus && config->maxcpus == 0)) {
+        error_setg(errp, "parameters must be equal to or greater than one"
+                   "if provided");
+        return;
+    }
+
+    if (!mc->smp_dies_supported && dies > 1) {
+        error_setg(errp, "dies not supported by this machine's CPU topology");
+        return;
+    }
+
+    maxcpus = maxcpus > 0 ? maxcpus : cpus;
+
+    /* prefer sockets over cores over threads before 6.2 */
+    if (mc->smp_prefer_sockets) {
+        if (sockets == 0) {
+            cores = cores > 0 ? cores : 1;
+            threads = threads > 0 ? threads : 1;
+            sockets = maxcpus / (dies * cores * threads);
+            sockets = sockets > 0 ? sockets : 1;
+        } else if (cores == 0) {
+            threads = threads > 0 ? threads : 1;
+            cores = maxcpus / (sockets * dies * threads);
+            cores = cores > 0 ? cores : 1;
+        } else if (threads == 0) {
+            threads = maxcpus / (sockets * dies * cores);
+            threads = threads > 0 ? threads : 1;
+        }
+    /* prefer cores over sockets over threads since 6.2 */
+    } else {
+        if (cores == 0) {
+            sockets = sockets > 0 ? sockets : 1;
+            threads = threads > 0 ? threads : 1;
+            cores = maxcpus / (sockets * dies * threads);
+            cores = cores > 0 ? cores : 1;
+        } else if (sockets == 0) {
+            threads = threads > 0 ? threads : 1;
+            sockets = maxcpus / (dies * cores * threads);
+            sockets = sockets > 0 ? sockets : 1;
+        } else if (threads == 0) {
+            threads = maxcpus / (sockets * dies * cores);
+            threads = threads > 0 ? threads : 1;
+        }
+    }
+
+    /* use the computed parameters to calculate the omitted cpus */
+    cpus = cpus > 0 ? cpus : sockets * dies * cores * threads;
+    maxcpus = maxcpus > 0 ? maxcpus : cpus;
+
+    if (sockets * dies * cores * threads != maxcpus) {
+        g_autofree char *dies_msg = g_strdup_printf(
+            mc->smp_dies_supported ? " * dies (%u)" : "", dies);
+        error_setg(errp, "Invalid CPU topology: "
+                   "sockets (%u)%s * cores (%u) * threads (%u) "
+                   "!= maxcpus (%u)",
+                   sockets, dies_msg, cores, threads,
+                   maxcpus);
+        return;
+    }
+
+    if (sockets * dies * cores * threads < cpus) {
+        g_autofree char *dies_msg = g_strdup_printf(
+            mc->smp_dies_supported ? " * dies (%u)" : "", dies);
+        error_setg(errp, "Invalid CPU topology: "
+                   "sockets (%u)%s * cores (%u) * threads (%u) < "
+                   "smp_cpus (%u)",
+                   sockets, dies_msg, cores, threads, cpus);
+        return;
+    }
+
+    ms->smp.cpus = cpus;
+    ms->smp.sockets = sockets;
+    ms->smp.dies = dies;
+    ms->smp.cores = cores;
+    ms->smp.threads = threads;
+    ms->smp.max_cpus = maxcpus;
+}
diff --git a/hw/core/machine.c b/hw/core/machine.c
index 9d24b67ef3..61be266b6c 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -744,115 +744,6 @@ void machine_set_cpu_numa_node(MachineState *machine,
     }
 }
 
-/*
- * smp_parse - Generic function used to parse the given SMP configuration
- *
- * The topology parameters must be specified equal to or great than one
- * or just omitted, explicit configuration like "cpus=0" is not allowed.
- * The omitted parameters will be calculated based on the provided ones.
- *
- * maxcpus will default to the value of cpus if omitted and will be used
- * to compute the missing sockets/cores/threads. cpus will be calculated
- * from the computed parametrs if omitted.
- *
- * In calculation of omitted arch-netural sockets/cores/threads, we prefer
- * sockets over cores over threads before 6.2, while prefer cores over
- * sockets over threads since 6.2 on. The arch-specific dies will directly
- * default to 1 if omitted.
- */
-static void smp_parse(MachineState *ms, SMPConfiguration *config, Error **errp)
-{
-    MachineClass *mc = MACHINE_GET_CLASS(ms);
-    unsigned cpus    = config->has_cpus ? config->cpus : 0;
-    unsigned sockets = config->has_sockets ? config->sockets : 0;
-    unsigned dies    = config->has_dies ? config->dies : 1;
-    unsigned cores   = config->has_cores ? config->cores : 0;
-    unsigned threads = config->has_threads ? config->threads : 0;
-    unsigned maxcpus = config->has_maxcpus ? config->maxcpus : 0;
-
-    if ((config->has_cpus && config->cpus == 0) ||
-        (config->has_sockets && config->sockets == 0) ||
-        (config->has_dies && config->dies == 0) ||
-        (config->has_cores && config->cores == 0) ||
-        (config->has_threads && config->threads == 0) ||
-        (config->has_maxcpus && config->maxcpus == 0)) {
-        error_setg(errp, "parameters must be equal to or greater than one"
-                   "if provided");
-        return;
-    }
-
-    if (!mc->smp_dies_supported && dies > 1) {
-        error_setg(errp, "dies not supported by this machine's CPU topology");
-        return;
-    }
-
-    maxcpus = maxcpus > 0 ? maxcpus : cpus;
-
-    /* prefer sockets over cores over threads before 6.2 */
-    if (mc->smp_prefer_sockets) {
-        if (sockets == 0) {
-            cores = cores > 0 ? cores : 1;
-            threads = threads > 0 ? threads : 1;
-            sockets = maxcpus / (dies * cores * threads);
-            sockets = sockets > 0 ? sockets : 1;
-        } else if (cores == 0) {
-            threads = threads > 0 ? threads : 1;
-            cores = maxcpus / (sockets * dies * threads);
-            cores = cores > 0 ? cores : 1;
-        } else if (threads == 0) {
-            threads = maxcpus / (sockets * dies * cores);
-            threads = threads > 0 ? threads : 1;
-        }
-    /* prefer cores over sockets over threads since 6.2 */
-    } else {
-        if (cores == 0) {
-            sockets = sockets > 0 ? sockets : 1;
-            threads = threads > 0 ? threads : 1;
-            cores = maxcpus / (sockets * dies * threads);
-            cores = cores > 0 ? cores : 1;
-        } else if (sockets == 0) {
-            threads = threads > 0 ? threads : 1;
-            sockets = maxcpus / (dies * cores * threads);
-            sockets = sockets > 0 ? sockets : 1;
-        } else if (threads == 0) {
-            threads = maxcpus / (sockets * dies * cores);
-            threads = threads > 0 ? threads : 1;
-        }
-    }
-
-    /* use the computed parameters to calculate the omitted cpus */
-    cpus = cpus > 0 ? cpus : sockets * dies * cores * threads;
-    maxcpus = maxcpus > 0 ? maxcpus : cpus;
-
-    if (sockets * dies * cores * threads != maxcpus) {
-        g_autofree char *dies_msg = g_strdup_printf(
-            mc->smp_dies_supported ? " * dies (%u)" : "", dies);
-        error_setg(errp, "Invalid CPU topology: "
-                   "sockets (%u)%s * cores (%u) * threads (%u) "
-                   "!= maxcpus (%u)",
-                   sockets, dies_msg, cores, threads,
-                   maxcpus);
-        return;
-    }
-
-    if (sockets * dies * cores * threads < cpus) {
-        g_autofree char *dies_msg = g_strdup_printf(
-            mc->smp_dies_supported ? " * dies (%u)" : "", dies);
-        error_setg(errp, "Invalid CPU topology: "
-                   "sockets (%u)%s * cores (%u) * threads (%u) < "
-                   "smp_cpus (%u)",
-                   sockets, dies_msg, cores, threads, cpus);
-        return;
-    }
-
-    ms->smp.cpus = cpus;
-    ms->smp.sockets = sockets;
-    ms->smp.dies = dies;
-    ms->smp.cores = cores;
-    ms->smp.threads = threads;
-    ms->smp.max_cpus = maxcpus;
-}
-
 static void machine_get_smp(Object *obj, Visitor *v, const char *name,
                             void *opaque, Error **errp)
 {
diff --git a/hw/core/meson.build b/hw/core/meson.build
index 18f44fb7c2..6d727c7742 100644
--- a/hw/core/meson.build
+++ b/hw/core/meson.build
@@ -14,6 +14,7 @@ hwcore_files = files(
 )
 
 common_ss.add(files('cpu-common.c'))
+common_ss.add(files('machine-smp.c'))
 common_ss.add(when: 'CONFIG_FITLOADER', if_true: files('loader-fit.c'))
 common_ss.add(when: 'CONFIG_GENERIC_LOADER', if_true: files('generic-loader.c'))
 common_ss.add(when: ['CONFIG_GUEST_LOADER', fdt], if_true: files('guest-loader.c'))
diff --git a/include/hw/boards.h b/include/hw/boards.h
index 12ab0f5968..071eec1e74 100644
--- a/include/hw/boards.h
+++ b/include/hw/boards.h
@@ -34,6 +34,7 @@ HotpluggableCPUList *machine_query_hotpluggable_cpus(MachineState *machine);
 void machine_set_cpu_numa_node(MachineState *machine,
                                const CpuInstanceProperties *props,
                                Error **errp);
+void smp_parse(MachineState *ms, SMPConfiguration *config, Error **errp);
 
 /**
  * machine_class_allow_dynamic_sysbus_dev: Add type to list of valid devices
-- 
2.19.1