stats: Move HMP commands from monitor/ to stats/

This moves these commands from MAINTAINERS section "Human
Monitor (HMP)" to section "Stats".

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20230124121946.1139465-24-armbru@redhat.com>

1 files changed, 247 insertions, 0 deletions

diff --git a/stats/stats-hmp-cmds.c b/stats/stats-hmp-cmds.c
new file mode 100644
index 0000000000..531e35d128
--- /dev/null
+++ b/stats/stats-hmp-cmds.c
@@ -0,0 +1,247 @@
+/*
+ * HMP commands related to stats
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * (at your option) any later version.
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/qapi-commands-stats.h"
+#include "monitor/hmp.h"
+#include "monitor/monitor.h"
+#include "qemu/cutils.h"
+#include "hw/core/cpu.h"
+#include "qapi/qmp/qdict.h"
+#include "qapi/error.h"
+
+static void print_stats_schema_value(Monitor *mon, StatsSchemaValue *value)
+{
+    const char *unit = NULL;
+    monitor_printf(mon, "    %s (%s%s", value->name, StatsType_str(value->type),
+                   value->has_unit || value->exponent ? ", " : "");
+
+    if (value->has_unit) {
+        if (value->unit == STATS_UNIT_SECONDS) {
+            unit = "s";
+        } else if (value->unit == STATS_UNIT_BYTES) {
+            unit = "B";
+        }
+    }
+
+    if (unit && value->base == 10 &&
+        value->exponent >= -18 && value->exponent <= 18 &&
+        value->exponent % 3 == 0) {
+        monitor_puts(mon, si_prefix(value->exponent));
+    } else if (unit && value->base == 2 &&
+               value->exponent >= 0 && value->exponent <= 60 &&
+               value->exponent % 10 == 0) {
+
+        monitor_puts(mon, iec_binary_prefix(value->exponent));
+    } else if (value->exponent) {
+        /* Use exponential notation and write the unit's English name */
+        monitor_printf(mon, "* %d^%d%s",
+                       value->base, value->exponent,
+                       value->has_unit ? " " : "");
+        unit = NULL;
+    }
+
+    if (value->has_unit) {
+        monitor_puts(mon, unit ? unit : StatsUnit_str(value->unit));
+    }
+
+    /* Print bucket size for linear histograms */
+    if (value->type == STATS_TYPE_LINEAR_HISTOGRAM && value->has_bucket_size) {
+        monitor_printf(mon, ", bucket size=%d", value->bucket_size);
+    }
+    monitor_printf(mon, ")");
+}
+
+static StatsSchemaValueList *find_schema_value_list(
+    StatsSchemaList *list, StatsProvider provider,
+    StatsTarget target)
+{
+    StatsSchemaList *node;
+
+    for (node = list; node; node = node->next) {
+        if (node->value->provider == provider &&
+            node->value->target == target) {
+            return node->value->stats;
+        }
+    }
+    return NULL;
+}
+
+static void print_stats_results(Monitor *mon, StatsTarget target,
+                                bool show_provider,
+                                StatsResult *result,
+                                StatsSchemaList *schema)
+{
+    /* Find provider schema */
+    StatsSchemaValueList *schema_value_list =
+        find_schema_value_list(schema, result->provider, target);
+    StatsList *stats_list;
+
+    if (!schema_value_list) {
+        monitor_printf(mon, "failed to find schema list for %s\n",
+                       StatsProvider_str(result->provider));
+        return;
+    }
+
+    if (show_provider) {
+        monitor_printf(mon, "provider: %s\n",
+                       StatsProvider_str(result->provider));
+    }
+
+    for (stats_list = result->stats; stats_list;
+             stats_list = stats_list->next,
+             schema_value_list = schema_value_list->next) {
+
+        Stats *stats = stats_list->value;
+        StatsValue *stats_value = stats->value;
+        StatsSchemaValue *schema_value = schema_value_list->value;
+
+        /* Find schema entry */
+        while (!g_str_equal(stats->name, schema_value->name)) {
+            if (!schema_value_list->next) {
+                monitor_printf(mon, "failed to find schema entry for %s\n",
+                               stats->name);
+                return;
+            }
+            schema_value_list = schema_value_list->next;
+            schema_value = schema_value_list->value;
+        }
+
+        print_stats_schema_value(mon, schema_value);
+
+        if (stats_value->type == QTYPE_QNUM) {
+            monitor_printf(mon, ": %" PRId64 "\n", stats_value->u.scalar);
+        } else if (stats_value->type == QTYPE_QBOOL) {
+            monitor_printf(mon, ": %s\n", stats_value->u.boolean ? "yes" : "no");
+        } else if (stats_value->type == QTYPE_QLIST) {
+            uint64List *list;
+            int i;
+
+            monitor_printf(mon, ": ");
+            for (list = stats_value->u.list, i = 1;
+                 list;
+                 list = list->next, i++) {
+                monitor_printf(mon, "[%d]=%" PRId64 " ", i, list->value);
+            }
+            monitor_printf(mon, "\n");
+        }
+    }
+}
+
+/* Create the StatsFilter that is needed for an "info stats" invocation.  */
+static StatsFilter *stats_filter(StatsTarget target, const char *names,
+                                 int cpu_index, StatsProvider provider)
+{
+    StatsFilter *filter = g_malloc0(sizeof(*filter));
+    StatsProvider provider_idx;
+    StatsRequestList *request_list = NULL;
+
+    filter->target = target;
+    switch (target) {
+    case STATS_TARGET_VM:
+        break;
+    case STATS_TARGET_VCPU:
+    {
+        strList *vcpu_list = NULL;
+        CPUState *cpu = qemu_get_cpu(cpu_index);
+        char *canonical_path = object_get_canonical_path(OBJECT(cpu));
+
+        QAPI_LIST_PREPEND(vcpu_list, canonical_path);
+        filter->u.vcpu.has_vcpus = true;
+        filter->u.vcpu.vcpus = vcpu_list;
+        break;
+    }
+    default:
+        break;
+    }
+
+    if (!names && provider == STATS_PROVIDER__MAX) {
+        return filter;
+    }
+
+    /*
+     * "info stats" can only query either one or all the providers.  Querying
+     * by name, but not by provider, requires the creation of one filter per
+     * provider.
+     */
+    for (provider_idx = 0; provider_idx < STATS_PROVIDER__MAX; provider_idx++) {
+        if (provider == STATS_PROVIDER__MAX || provider == provider_idx) {
+            StatsRequest *request = g_new0(StatsRequest, 1);
+            request->provider = provider_idx;
+            if (names && !g_str_equal(names, "*")) {
+                request->has_names = true;
+                request->names = hmp_split_at_comma(names);
+            }
+            QAPI_LIST_PREPEND(request_list, request);
+        }
+    }
+
+    filter->has_providers = true;
+    filter->providers = request_list;
+    return filter;
+}
+
+void hmp_info_stats(Monitor *mon, const QDict *qdict)
+{
+    const char *target_str = qdict_get_str(qdict, "target");
+    const char *provider_str = qdict_get_try_str(qdict, "provider");
+    const char *names = qdict_get_try_str(qdict, "names");
+
+    StatsProvider provider = STATS_PROVIDER__MAX;
+    StatsTarget target;
+    Error *err = NULL;
+    g_autoptr(StatsSchemaList) schema = NULL;
+    g_autoptr(StatsResultList) stats = NULL;
+    g_autoptr(StatsFilter) filter = NULL;
+    StatsResultList *entry;
+
+    target = qapi_enum_parse(&StatsTarget_lookup, target_str, -1, &err);
+    if (err) {
+        monitor_printf(mon, "invalid stats target %s\n", target_str);
+        goto exit_no_print;
+    }
+    if (provider_str) {
+        provider = qapi_enum_parse(&StatsProvider_lookup, provider_str, -1, &err);
+        if (err) {
+            monitor_printf(mon, "invalid stats provider %s\n", provider_str);
+            goto exit_no_print;
+        }
+    }
+
+    schema = qmp_query_stats_schemas(provider_str ? true : false,
+                                     provider, &err);
+    if (err) {
+        goto exit;
+    }
+
+    switch (target) {
+    case STATS_TARGET_VM:
+        filter = stats_filter(target, names, -1, provider);
+        break;
+    case STATS_TARGET_VCPU: {}
+        int cpu_index = monitor_get_cpu_index(mon);
+        filter = stats_filter(target, names, cpu_index, provider);
+        break;
+    default:
+        abort();
+    }
+
+    stats = qmp_query_stats(filter, &err);
+    if (err) {
+        goto exit;
+    }
+    for (entry = stats; entry; entry = entry->next) {
+        print_stats_results(mon, target, provider_str == NULL, entry->value, schema);
+    }
+
+exit:
+    if (err) {
+        monitor_printf(mon, "%s\n", error_get_pretty(err));
+    }
+exit_no_print:
+    error_free(err);
+}