chardev: introduce chr_machine_done hook
Introduce ChardevClass.chr_machine_done() hook so that chardevs can run
customized procedures after machine init.
There was an existing mux user already that did similar thing but used a
raw machine done notifier. Generalize it into a framework, and let the
mux chardevs provide such a class-specific hook to achieve the same
thing. Then we can move the mux related code to the char-mux.c file.
Since at it, replace the mux_realized variable with the global
machine_init_done varible.
This notifier framework will be further leverged by other type of
chardevs soon.
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20180306053320.15401-6-peterx@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/chardev/char-mux.c b/chardev/char-mux.c
index d48e781..1b925c8 100644
--- a/chardev/char-mux.c
+++ b/chardev/char-mux.c
@@ -27,6 +27,7 @@
#include "qemu/option.h"
#include "chardev/char.h"
#include "sysemu/block-backend.h"
+#include "sysemu/sysemu.h"
#include "chardev/char-mux.h"
/* MUX driver for serial I/O splitting */
@@ -230,14 +231,12 @@
}
}
-bool muxes_realized;
-
void mux_chr_send_all_event(Chardev *chr, int event)
{
MuxChardev *d = MUX_CHARDEV(chr);
int i;
- if (!muxes_realized) {
+ if (!machine_init_done) {
return;
}
@@ -327,7 +326,7 @@
/* only default to opened state if we've realized the initial
* set of muxes
*/
- *be_opened = muxes_realized;
+ *be_opened = machine_init_done;
qemu_chr_fe_init(&d->chr, drv, errp);
}
@@ -347,6 +346,31 @@
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 int 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
+ */
+ qemu_chr_be_event(chr, CHR_EVENT_OPENED);
+
+ return 0;
+}
+
static void char_mux_class_init(ObjectClass *oc, void *data)
{
ChardevClass *cc = CHARDEV_CLASS(oc);
@@ -357,6 +381,7 @@
cc->chr_accept_input = mux_chr_accept_input;
cc->chr_add_watch = mux_chr_add_watch;
cc->chr_be_event = mux_chr_be_event;
+ cc->chr_machine_done = open_muxes;
}
static const TypeInfo char_mux_type_info = {
diff --git a/chardev/char.c b/chardev/char.c
index 5d7b079..a6250ca 100644
--- a/chardev/char.c
+++ b/chardev/char.c
@@ -281,40 +281,31 @@
.class_init = char_class_init,
};
-/**
- * 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 int open_muxes(Object *child, void *opaque)
+static int chardev_machine_done_notify_one(Object *child, void *opaque)
{
- if (CHARDEV_IS_MUX(child)) {
- /* send OPENED to all already-attached FEs */
- mux_chr_send_all_event(CHARDEV(child), CHR_EVENT_OPENED);
- /* mark mux as OPENED so any new FEs will immediately receive
- * OPENED event
- */
- qemu_chr_be_event(CHARDEV(child), CHR_EVENT_OPENED);
+ Chardev *chr = (Chardev *)child;
+ ChardevClass *class = CHARDEV_GET_CLASS(chr);
+
+ if (class->chr_machine_done) {
+ return class->chr_machine_done(chr);
}
return 0;
}
-static void muxes_realize_done(Notifier *notifier, void *unused)
+static void chardev_machine_done_hook(Notifier *notifier, void *unused)
{
- muxes_realized = true;
- object_child_foreach(get_chardevs_root(), open_muxes, NULL);
+ int ret = object_child_foreach(get_chardevs_root(),
+ chardev_machine_done_notify_one, NULL);
+
+ if (ret) {
+ error_report("Failed to call chardev machine_done hooks");
+ exit(1);
+ }
}
-static Notifier muxes_realize_notify = {
- .notify = muxes_realize_done,
+static Notifier chardev_machine_done_notify = {
+ .notify = chardev_machine_done_hook,
};
static bool qemu_chr_is_busy(Chardev *s)
@@ -1118,7 +1109,7 @@
* as part of realize functions like serial_isa_realizefn when -nographic
* is specified
*/
- qemu_add_machine_init_done_notifier(&muxes_realize_notify);
+ qemu_add_machine_init_done_notifier(&chardev_machine_done_notify);
}
type_init(register_types);
diff --git a/include/chardev/char-mux.h b/include/chardev/char-mux.h
index 8928977..1e13187 100644
--- a/include/chardev/char-mux.h
+++ b/include/chardev/char-mux.h
@@ -27,8 +27,6 @@
#include "chardev/char.h"
#include "chardev/char-fe.h"
-extern bool muxes_realized;
-
#define MAX_MUX 4
#define MUX_BUFFER_SIZE 32 /* Must be a power of 2. */
#define MUX_BUFFER_MASK (MUX_BUFFER_SIZE - 1)
diff --git a/include/chardev/char.h b/include/chardev/char.h
index ebf1e0b..04de457 100644
--- a/include/chardev/char.h
+++ b/include/chardev/char.h
@@ -248,6 +248,8 @@
void (*chr_set_echo)(Chardev *chr, bool echo);
void (*chr_set_fe_open)(Chardev *chr, int fe_open);
void (*chr_be_event)(Chardev *s, int event);
+ /* Return 0 if succeeded, 1 if failed */
+ int (*chr_machine_done)(Chardev *chr);
} ChardevClass;
Chardev *qemu_chardev_new(const char *id, const char *typename,
diff --git a/tests/test-char.c b/tests/test-char.c
index b3a77af..c731313 100644
--- a/tests/test-char.c
+++ b/tests/test-char.c
@@ -166,7 +166,6 @@
FeHandler h1 = { 0, }, h2 = { 0, };
CharBackend chr_be1, chr_be2;
- muxes_realized = true; /* done after machine init */
opts = qemu_opts_create(qemu_find_opts("chardev"), "mux-label",
1, &error_abort);
qemu_opt_set(opts, "backend", "ringbuf", &error_abort);
