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authorMarc-André Lureau <marcandre.lureau@redhat.com>2016-10-22 12:52:48 +0300
committerPaolo Bonzini <pbonzini@redhat.com>2016-10-24 15:27:20 +0200
commit6dfa8298faa0fce47c68659fd4d92e76745d4edb (patch)
treeca711210c68e1789d7776ffc4a7dda7ea87f7c1c /qemu-char.c
parentc8cccba3125d8d1a7ca66fc593a89543f3fe823d (diff)
mux: split mux_chr_update_read_handler()
Make qemu_chr_add_handlers_full() aware of mux handling. This allows introduction of a tag associated with the fe handlers and a qemu_chr_set_handlers() function to set the handler for a particular tag. That will allow to get rid of qemu_chr_add_handlers*() in later changes, in favor of qemu_chr_fe_set_handler(). To this end, chr_update_read_handler callback is enhanced with a tag argument, and mux_chr_update_read_handler() is splitted in new functions: mux_chr_new_handler_tag(), mux_chr_set_handlers(), mux_set_focus(). Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20161022095318.17775-9-marcandre.lureau@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'qemu-char.c')
-rw-r--r--qemu-char.c139
1 files changed, 98 insertions, 41 deletions
diff --git a/qemu-char.c b/qemu-char.c
index 22504cc2ab..29b339fd32 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -89,6 +89,8 @@
#define READ_RETRIES 10
#define TCP_MAX_FDS 16
+typedef struct MuxDriver MuxDriver;
+
/***********************************************************/
/* Socket address helpers */
@@ -449,12 +451,14 @@ void qemu_chr_fe_printf(CharDriverState *s, const char *fmt, ...)
static void remove_fd_in_watch(CharDriverState *chr);
-void qemu_chr_add_handlers_full(CharDriverState *s,
- IOCanReadHandler *fd_can_read,
- IOReadHandler *fd_read,
- IOEventHandler *fd_event,
- void *opaque,
- GMainContext *context)
+static void
+qemu_chr_set_handlers(CharDriverState *s,
+ IOCanReadHandler *fd_can_read,
+ IOReadHandler *fd_read,
+ IOEventHandler *fd_event,
+ void *opaque,
+ GMainContext *context,
+ int tag)
{
int fe_open;
@@ -469,7 +473,7 @@ void qemu_chr_add_handlers_full(CharDriverState *s,
s->chr_event = fd_event;
s->handler_opaque = opaque;
if (s->chr_update_read_handler) {
- s->chr_update_read_handler(s, context);
+ s->chr_update_read_handler(s, context, tag);
}
if (!s->explicit_fe_open) {
@@ -483,6 +487,34 @@ void qemu_chr_add_handlers_full(CharDriverState *s,
}
}
+static int mux_chr_new_handler_tag(CharDriverState *chr, Error **errp);
+static void mux_chr_set_handlers(CharDriverState *chr, GMainContext *context);
+static void mux_set_focus(MuxDriver *d, int focus);
+
+void qemu_chr_add_handlers_full(CharDriverState *s,
+ IOCanReadHandler *fd_can_read,
+ IOReadHandler *fd_read,
+ IOEventHandler *fd_event,
+ void *opaque,
+ GMainContext *context)
+{
+ int tag = 0;
+
+ if (s->is_mux) {
+ tag = mux_chr_new_handler_tag(s, &error_abort);
+ if (tag == 0) {
+ mux_chr_set_handlers(s, context);
+ }
+ }
+
+ qemu_chr_set_handlers(s, fd_can_read, fd_read,
+ fd_event, opaque, context, tag);
+
+ if (s->is_mux) {
+ mux_set_focus(s->opaque, tag);
+ }
+}
+
void qemu_chr_add_handlers(CharDriverState *s,
IOCanReadHandler *fd_can_read,
IOReadHandler *fd_read,
@@ -519,7 +551,7 @@ static CharDriverState *qemu_chr_open_null(const char *id,
#define MAX_MUX 4
#define MUX_BUFFER_SIZE 32 /* Must be a power of 2. */
#define MUX_BUFFER_MASK (MUX_BUFFER_SIZE - 1)
-typedef struct {
+struct MuxDriver {
IOCanReadHandler *chr_can_read[MAX_MUX];
IOReadHandler *chr_read[MAX_MUX];
IOEventHandler *chr_event[MAX_MUX];
@@ -540,8 +572,7 @@ typedef struct {
/* Protected by the CharDriverState chr_write_lock. */
int linestart;
int64_t timestamps_start;
-} MuxDriver;
-
+};
/* Called with chr_write_lock held. */
static int mux_chr_write(CharDriverState *chr, const uint8_t *buf, int len)
@@ -655,12 +686,9 @@ static int mux_proc_byte(CharDriverState *chr, MuxDriver *d, int ch)
qemu_chr_be_event(chr, CHR_EVENT_BREAK);
break;
case 'c':
+ assert(d->mux_cnt > 0); /* handler registered with first fe */
/* Switch to the next registered device */
- mux_chr_send_event(d, d->focus, CHR_EVENT_MUX_OUT);
- d->focus++;
- if (d->focus >= d->mux_cnt)
- d->focus = 0;
- mux_chr_send_event(d, d->focus, CHR_EVENT_MUX_IN);
+ mux_set_focus(d, (d->focus + 1) % d->mux_cnt);
break;
case 't':
d->timestamps = !d->timestamps;
@@ -735,31 +763,18 @@ static void mux_chr_event(void *opaque, int event)
}
static void mux_chr_update_read_handler(CharDriverState *chr,
- GMainContext *context)
+ GMainContext *context,
+ int tag)
{
MuxDriver *d = chr->opaque;
- if (d->mux_cnt >= MAX_MUX) {
- fprintf(stderr, "Cannot add I/O handlers, MUX array is full\n");
- return;
- }
- d->ext_opaque[d->mux_cnt] = chr->handler_opaque;
- d->chr_can_read[d->mux_cnt] = chr->chr_can_read;
- d->chr_read[d->mux_cnt] = chr->chr_read;
- d->chr_event[d->mux_cnt] = chr->chr_event;
- /* Fix up the real driver with mux routines */
- if (d->mux_cnt == 0) {
- qemu_chr_add_handlers_full(d->drv, mux_chr_can_read,
- mux_chr_read,
- mux_chr_event,
- chr, context);
- }
- if (d->focus != -1) {
- mux_chr_send_event(d, d->focus, CHR_EVENT_MUX_OUT);
- }
- d->focus = d->mux_cnt;
- d->mux_cnt++;
- mux_chr_send_event(d, d->focus, CHR_EVENT_MUX_IN);
+ assert(tag >= 0);
+ assert(tag < d->mux_cnt);
+
+ d->ext_opaque[tag] = chr->handler_opaque;
+ d->chr_can_read[tag] = chr->chr_can_read;
+ d->chr_read[tag] = chr->chr_read;
+ d->chr_event[tag] = chr->chr_event;
}
static bool muxes_realized;
@@ -815,6 +830,44 @@ static void mux_chr_close(struct CharDriverState *chr)
g_free(d);
}
+static int mux_chr_new_handler_tag(CharDriverState *chr, Error **errp)
+{
+ MuxDriver *d = chr->opaque;
+
+ if (d->mux_cnt >= MAX_MUX) {
+ fprintf(stderr, "Cannot add I/O handlers, MUX array is full\n");
+ return -1;
+ }
+
+ return d->mux_cnt++;
+}
+
+static void mux_chr_set_handlers(CharDriverState *chr, GMainContext *context)
+{
+ MuxDriver *d = chr->opaque;
+
+ /* Fix up the real driver with mux routines */
+ qemu_chr_add_handlers_full(d->drv,
+ mux_chr_can_read,
+ mux_chr_read,
+ mux_chr_event,
+ chr,
+ context);
+}
+
+static void mux_set_focus(MuxDriver *d, int focus)
+{
+ assert(focus >= 0);
+ assert(focus < d->mux_cnt);
+
+ if (d->focus != -1) {
+ mux_chr_send_event(d, d->focus, CHR_EVENT_MUX_OUT);
+ }
+
+ d->focus = focus;
+ mux_chr_send_event(d, d->focus, CHR_EVENT_MUX_IN);
+}
+
static CharDriverState *qemu_chr_open_mux(const char *id,
ChardevBackend *backend,
ChardevReturn *ret, Error **errp)
@@ -1085,7 +1138,8 @@ static GSource *fd_chr_add_watch(CharDriverState *chr, GIOCondition cond)
}
static void fd_chr_update_read_handler(CharDriverState *chr,
- GMainContext *context)
+ GMainContext *context,
+ int tag)
{
FDCharDriver *s = chr->opaque;
@@ -1342,7 +1396,8 @@ static void pty_chr_update_read_handler_locked(CharDriverState *chr)
}
static void pty_chr_update_read_handler(CharDriverState *chr,
- GMainContext *context)
+ GMainContext *context,
+ int tag)
{
qemu_mutex_lock(&chr->chr_write_lock);
pty_chr_update_read_handler_locked(chr);
@@ -2589,7 +2644,8 @@ static gboolean udp_chr_read(QIOChannel *chan, GIOCondition cond, void *opaque)
}
static void udp_chr_update_read_handler(CharDriverState *chr,
- GMainContext *context)
+ GMainContext *context,
+ int tag)
{
NetCharDriver *s = chr->opaque;
@@ -3008,7 +3064,8 @@ static void tcp_chr_connect(void *opaque)
}
static void tcp_chr_update_read_handler(CharDriverState *chr,
- GMainContext *context)
+ GMainContext *context,
+ int tag)
{
TCPCharDriver *s = chr->opaque;