[PATCH v5 13/13] qapi/cxl.json: Add QMP interfaces to print out accepted and pending DC extents

[nifan.cxl@gmail.com]

From: Fan Ni <fan.ni@samsung.com>

With the change, we add the following two QMP interfaces to print out
extents information in the device,
1. cxl-display-accepted-dc-extents: print out the accepted DC extents in
   the device;
2. cxl-display-pending-to-add-dc-extents: print out the pending-to-add
   DC extents in the device;
The output is appended to a file passed to the command and by default
it is /tmp/dc-extent.txt.

Signed-off-by: Fan Ni <fan.ni@samsung.com>
---
 hw/mem/cxl_type3.c       | 80 ++++++++++++++++++++++++++++++++++++++++
 hw/mem/cxl_type3_stubs.c | 12 ++++++
 qapi/cxl.json            | 32 ++++++++++++++++
 3 files changed, 124 insertions(+)

diff --git a/hw/mem/cxl_type3.c b/hw/mem/cxl_type3.c
index 5bd64e604e..6a08e7ae40 100644
--- a/hw/mem/cxl_type3.c
+++ b/hw/mem/cxl_type3.c
@@ -2089,6 +2089,86 @@ void qmp_cxl_release_dynamic_capacity(const char *path, uint8_t region_id,
                                      region_id, records, errp);
 }
 
+static void cxl_dcd_display_extent_list(const CXLType3Dev *dcd, const char *f,
+                                        bool accepted_list, Error **errp)
+{
+    const CXLDCExtentList *list;
+    CXLDCExtent *ent;
+    FILE *fp = NULL;
+    int i = 0;
+
+    if (!dcd->dc.num_regions) {
+        error_setg(errp, "No dynamic capacity support from the device");
+        return;
+    }
+
+    if (!f) {
+        fp = fopen("/tmp/dc-extent.txt", "a+");
+    } else {
+        fp = fopen(f, "a+");
+    }
+
+    if (!fp) {
+        error_setg(errp, "Open log file failed");
+        return;
+    }
+    if (accepted_list) {
+        list = &dcd->dc.extents;
+        fprintf(fp, "Print accepted extent info:\n");
+    } else {
+        list = &dcd->dc.extents_pending_to_add;
+        fprintf(fp, "Print pending-to-add extent info:\n");
+    }
+
+    QTAILQ_FOREACH(ent, list, node) {
+        fprintf(fp, "%d: [0x%lx - 0x%lx]\n", i++, ent->start_dpa,
+                               ent->start_dpa + ent->len);
+    }
+    fprintf(fp, "In total, %d extents printed!\n", i);
+    fclose(fp);
+}
+
+void qmp_cxl_display_accepted_dc_extents(const char *path, const char *f,
+                                         Error **errp)
+{
+    Object *obj;
+    CXLType3Dev *dcd;
+
+    obj = object_resolve_path(path, NULL);
+    if (!obj) {
+        error_setg(errp, "Unable to resolve path");
+        return;
+    }
+    if (!object_dynamic_cast(obj, TYPE_CXL_TYPE3)) {
+        error_setg(errp, "Path not point to a valid CXL type3 device");
+        return;
+    }
+
+    dcd = CXL_TYPE3(obj);
+    cxl_dcd_display_extent_list(dcd, f, true, errp);
+}
+
+void qmp_cxl_display_pending_to_add_dc_extents(const char *path, const char *f,
+                                               Error **errp)
+{
+    Object *obj;
+    CXLType3Dev *dcd;
+
+    obj = object_resolve_path(path, NULL);
+    if (!obj) {
+        error_setg(errp, "Unable to resolve path");
+        return;
+    }
+    if (!object_dynamic_cast(obj, TYPE_CXL_TYPE3)) {
+        error_setg(errp, "Path not point to a valid CXL type3 device");
+        return;
+    }
+
+
+    dcd = CXL_TYPE3(obj);
+    cxl_dcd_display_extent_list(dcd, f, false, errp);
+}
+
 static void ct3_class_init(ObjectClass *oc, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(oc);
diff --git a/hw/mem/cxl_type3_stubs.c b/hw/mem/cxl_type3_stubs.c
index d913b11b4d..d896758301 100644
--- a/hw/mem/cxl_type3_stubs.c
+++ b/hw/mem/cxl_type3_stubs.c
@@ -81,3 +81,15 @@ void qmp_cxl_release_dynamic_capacity(const char *path, uint8_t region_id,
 {
     error_setg(errp, "CXL Type 3 support is not compiled in");
 }
+
+void qmp_cxl_display_accepted_dc_extents(const char *path, const char *f,
+                                         Error **errp)
+{
+    error_setg(errp, "CXL Type 3 support is not compiled in");
+}
+
+void qmp_cxl_display_pending_to_add_dc_extents(const char *path, const char *f,
+                                               Error **errp)
+{
+    error_setg(errp, "CXL Type 3 support is not compiled in");
+}
diff --git a/qapi/cxl.json b/qapi/cxl.json
index 2645004666..6f10300ec6 100644
--- a/qapi/cxl.json
+++ b/qapi/cxl.json
@@ -420,3 +420,35 @@
             'extents': [ 'CXLDCExtentRecord' ]
            }
 }
+
+##
+# @cxl-display-accepted-dc-extents:
+#
+# Command to print out all the accepted DC extents in the device
+#
+# @path: CXL DCD canonical QOM path
+# @output: path of output file to dump the results to
+#
+# Since : 9.0
+##
+{ 'command': 'cxl-display-accepted-dc-extents',
+  'data': { 'path': 'str',
+            'output': 'str'
+           }
+}
+
+##
+# @cxl-display-pending-to-add-dc-extents:
+#
+# Command to print out all the pending-to-add DC extents in the device
+#
+# @path: CXL DCD canonical QOM path
+# @output: path of output file to dump the results to
+#
+# Since : 9.0
+##
+{ 'command': 'cxl-display-pending-to-add-dc-extents',
+  'data': { 'path': 'str',
+            'output': 'str'
+           }
+}
-- 
2.43.0