[PATCH v5 3/8] chardev/char: move away mux suspend/resume calls

[Roman Penyaev <r.peniaev@gmail.com>]

The suspend/resume open multiplexer calls are generic
and will be used for frontend (current mux) and backend
(will follow) implementations. Move them away from the
`char-mux-fe.c` to more generic `char.c` file. Also
for the sake of clarity these renames were made:

  s/suspend_mux_open/mux_suspend_open/g
  s/resume_mux_open/mux_resume_open/g

No functional changes are made.

Signed-off-by: Roman Penyaev <r.peniaev@gmail.com>
Cc: "Marc-André Lureau" <marcandre.lureau@redhat.com>
Cc: qemu-devel@nongnu.org
---
 chardev/char-mux-fe.c      | 63 ++-------------------------------
 chardev/char.c             | 72 ++++++++++++++++++++++++++++++++++++++
 chardev/chardev-internal.h |  3 ++
 include/chardev/char.h     |  5 +--
 system/vl.c                |  4 +--
 5 files changed, 82 insertions(+), 65 deletions(-)

diff --git a/chardev/char-mux-fe.c b/chardev/char-mux-fe.c
index dfaea5aefac3..6a195390a3c9 100644
--- a/chardev/char-mux-fe.c
+++ b/chardev/char-mux-fe.c
@@ -34,13 +34,6 @@
 
 /* MUX driver for serial I/O splitting */
 
-/*
- * Set to false by suspend_mux_open.  Open events are delayed until
- * resume_mux_open.  Usually suspend_mux_open is called before
- * command line processing and resume_mux_open afterwards.
- */
-static bool muxes_opened = true;
-
 /* Called with chr_write_lock held.  */
 static int mux_chr_write(Chardev *chr, const uint8_t *buf, int len)
 {
@@ -248,15 +241,10 @@ static void mux_chr_read(void *opaque, const uint8_t *buf, int size)
         }
 }
 
-void mux_chr_send_all_event(Chardev *chr, QEMUChrEvent event)
+void mux_fe_chr_send_all_event(MuxFeChardev *d, QEMUChrEvent event)
 {
-    MuxFeChardev *d = MUX_FE_CHARDEV(chr);
     int bit;
 
-    if (!muxes_opened) {
-        return;
-    }
-
     /* Send the event to all registered listeners */
     bit = -1;
     while ((bit = find_next_bit(&d->mux_bitset, MAX_MUX, bit + 1)) < MAX_MUX) {
@@ -381,7 +369,7 @@ static void qemu_chr_open_mux(Chardev *chr,
     /* only default to opened state if we've realized the initial
      * set of muxes
      */
-    *be_opened = muxes_opened;
+    *be_opened = mux_is_opened();
     qemu_chr_fe_init(&d->chr, drv, errp);
 }
 
@@ -401,53 +389,6 @@ static void qemu_chr_parse_mux(QemuOpts *opts, ChardevBackend *backend,
     mux->chardev = g_strdup(chardev);
 }
 
-/**
- * Called after processing of default and command-line-specified
- * chardevs to deliver CHR_EVENT_OPENED events to any FEs attached
- * to a mux chardev. This is done here to ensure that
- * output/prompts/banners are only displayed for the FE that has
- * focus when initial command-line processing/machine init is
- * completed.
- *
- * After this point, any new FE attached to any new or existing
- * mux will receive CHR_EVENT_OPENED notifications for the BE
- * immediately.
- */
-static void open_muxes(Chardev *chr)
-{
-    /* send OPENED to all already-attached FEs */
-    mux_chr_send_all_event(chr, CHR_EVENT_OPENED);
-
-    /*
-     * mark mux as OPENED so any new FEs will immediately receive
-     * OPENED event
-     */
-    chr->be_open = 1;
-}
-
-void suspend_mux_open(void)
-{
-    muxes_opened = false;
-}
-
-static int chardev_options_parsed_cb(Object *child, void *opaque)
-{
-    Chardev *chr = (Chardev *)child;
-
-    if (!chr->be_open && CHARDEV_IS_MUX_FE(chr)) {
-        open_muxes(chr);
-    }
-
-    return 0;
-}
-
-void resume_mux_open(void)
-{
-    muxes_opened = true;
-    object_child_foreach(get_chardevs_root(),
-                         chardev_options_parsed_cb, NULL);
-}
-
 static void char_mux_class_init(ObjectClass *oc, void *data)
 {
     ChardevClass *cc = CHARDEV_CLASS(oc);
diff --git a/chardev/char.c b/chardev/char.c
index e077773cdece..d8dbdb6f84f1 100644
--- a/chardev/char.c
+++ b/chardev/char.c
@@ -43,6 +43,13 @@
 
 #include "chardev-internal.h"
 
+/*
+ * Set to false by mux_suspend_open().  Open events are delayed until
+ * mux_resume_open().  Usually mux_suspend_open() is called before
+ * command line processing and mux_resume_open() afterwards.
+ */
+static bool muxes_opened = true;
+
 /***********************************************************/
 /* character device */
 
@@ -1259,6 +1266,71 @@ void qemu_chr_cleanup(void)
     object_unparent(get_chardevs_root());
 }
 
+/**
+ * Called after processing of default and command-line-specified
+ * chardevs to deliver CHR_EVENT_OPENED events to any FEs attached
+ * to a mux chardev. This is done here to ensure that
+ * output/prompts/banners are only displayed for the FE that has
+ * focus when initial command-line processing/machine init is
+ * completed.
+ *
+ * After this point, any new FE attached to any new or existing
+ * mux will receive CHR_EVENT_OPENED notifications for the BE
+ * immediately.
+ */
+static void open_muxes(Chardev *chr)
+{
+    /* send OPENED to all already-attached FEs */
+    mux_chr_send_all_event(chr, CHR_EVENT_OPENED);
+
+    /*
+     * mark mux as OPENED so any new FEs will immediately receive
+     * OPENED event
+     */
+    chr->be_open = 1;
+}
+
+void mux_suspend_open(void)
+{
+    muxes_opened = false;
+}
+
+static int chardev_options_parsed_cb(Object *child, void *opaque)
+{
+    Chardev *chr = (Chardev *)child;
+
+    if (!chr->be_open && CHARDEV_IS_MUX_FE(chr)) {
+        open_muxes(chr);
+    }
+
+    return 0;
+}
+
+void mux_resume_open(void)
+{
+    muxes_opened = true;
+    object_child_foreach(get_chardevs_root(),
+                         chardev_options_parsed_cb, NULL);
+}
+
+bool mux_is_opened(void)
+{
+    return muxes_opened;
+}
+
+void mux_chr_send_all_event(Chardev *chr, QEMUChrEvent event)
+{
+    if (!mux_is_opened()) {
+        return;
+    }
+
+    if (CHARDEV_IS_MUX_FE(chr)) {
+        MuxFeChardev *d = MUX_FE_CHARDEV(chr);
+
+        mux_fe_chr_send_all_event(d, event);
+    }
+}
+
 static void register_types(void)
 {
     type_register_static(&char_type_info);
diff --git a/chardev/chardev-internal.h b/chardev/chardev-internal.h
index 321051bb9cc5..c874850a41ad 100644
--- a/chardev/chardev-internal.h
+++ b/chardev/chardev-internal.h
@@ -65,6 +65,9 @@ bool mux_chr_detach_frontend(MuxFeChardev *d, unsigned int tag);
 void mux_set_focus(Chardev *chr, unsigned int focus);
 void mux_chr_send_all_event(Chardev *chr, QEMUChrEvent event);
 
+/* Mux type dependent calls */
+void mux_fe_chr_send_all_event(MuxFeChardev *d, QEMUChrEvent event);
+
 Object *get_chardevs_root(void);
 
 #endif /* CHARDEV_INTERNAL_H */
diff --git a/include/chardev/char.h b/include/chardev/char.h
index d9d23b6232db..0bec974f9d73 100644
--- a/include/chardev/char.h
+++ b/include/chardev/char.h
@@ -317,7 +317,8 @@ extern int term_escape_char;
 GSource *qemu_chr_timeout_add_ms(Chardev *chr, guint ms,
                                  GSourceFunc func, void *private);
 
-void suspend_mux_open(void);
-void resume_mux_open(void);
+bool mux_is_opened(void);
+void mux_suspend_open(void);
+void mux_resume_open(void);
 
 #endif
diff --git a/system/vl.c b/system/vl.c
index e83b3b2608bf..b3cbfe2c0f84 100644
--- a/system/vl.c
+++ b/system/vl.c
@@ -3679,7 +3679,7 @@ void qemu_init(int argc, char **argv)
 
     qemu_create_machine(machine_opts_dict);
 
-    suspend_mux_open();
+    mux_suspend_open();
 
     qemu_disable_default_devices();
     qemu_setup_display();
@@ -3757,5 +3757,5 @@ void qemu_init(int argc, char **argv)
     qemu_init_displays();
     accel_setup_post(current_machine);
     os_setup_post();
-    resume_mux_open();
+    mux_resume_open();
 }
-- 
2.34.1