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[Qemu-devel] [PATCH 21/38] char: move front end handlers in CharBackend
From: |
Marc-André Lureau |
Subject: |
[Qemu-devel] [PATCH 21/38] char: move front end handlers in CharBackend |
Date: |
Sat, 22 Oct 2016 12:53:01 +0300 |
Since the hanlders are associated with a CharBackend, rather than the
CharDriverState, it is more appropriate to store in CharBackend. This
avoids the handler copy dance in qemu_chr_fe_set_handlers() then
mux_chr_update_read_handler(), by storing the CharBackend pointer
directly.
Also a mux CharDriver should go through mux->backends[focused], since
chr->be will stay NULL. Before that, it was possible to call
chr->handler by mistake with surprising results, for ex through
qemu_chr_be_can_write(), which would result in calling the last set
handler front end, not the one with focus.
Signed-off-by: Marc-André Lureau <address@hidden>
---
hw/bt/hci-csr.c | 12 +++--
qemu-char.c | 131 +++++++++++++++++++++++++++-----------------------
ui/console.c | 4 +-
include/sysemu/char.h | 11 +++--
4 files changed, 88 insertions(+), 70 deletions(-)
diff --git a/hw/bt/hci-csr.c b/hw/bt/hci-csr.c
index b77c036..cdf52a9 100644
--- a/hw/bt/hci-csr.c
+++ b/hw/bt/hci-csr.c
@@ -78,15 +78,17 @@ enum {
static inline void csrhci_fifo_wake(struct csrhci_s *s)
{
+ CharBackend *be = s->chr.be;
+
if (!s->enable || !s->out_len)
return;
/* XXX: Should wait for s->modem_state & CHR_TIOCM_RTS? */
- if (s->chr.chr_can_read && s->chr.chr_can_read(s->chr.handler_opaque) &&
- s->chr.chr_read) {
- s->chr.chr_read(s->chr.handler_opaque,
- s->outfifo + s->out_start ++, 1);
- s->out_len --;
+ if (be && be->chr_can_read && be->chr_can_read(be->opaque) &&
+ be->chr_read) {
+ be->chr_read(be->opaque,
+ s->outfifo + s->out_start++, 1);
+ s->out_len--;
if (s->out_start >= s->out_size) {
s->out_start = 0;
s->out_size = FIFO_LEN;
diff --git a/qemu-char.c b/qemu-char.c
index dee2ced..1c6f39b 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -192,6 +192,8 @@ CharDriverState *qemu_chr_alloc(ChardevCommon *backend,
Error **errp)
void qemu_chr_be_event(CharDriverState *s, int event)
{
+ CharBackend *be = s->be;
+
/* Keep track if the char device is open */
switch (event) {
case CHR_EVENT_OPENED:
@@ -202,9 +204,11 @@ void qemu_chr_be_event(CharDriverState *s, int event)
break;
}
- if (!s->chr_event)
+ if (!be || !be->chr_event) {
return;
- s->chr_event(s->handler_opaque, event);
+ }
+
+ be->chr_event(be->opaque, event);
}
void qemu_chr_be_generic_open(CharDriverState *s)
@@ -398,15 +402,21 @@ int qemu_chr_fe_ioctl(CharBackend *be, int cmd, void *arg)
int qemu_chr_be_can_write(CharDriverState *s)
{
- if (!s->chr_can_read)
+ CharBackend *be = s->be;
+
+ if (!be || !be->chr_can_read) {
return 0;
- return s->chr_can_read(s->handler_opaque);
+ }
+
+ return be->chr_can_read(be->opaque);
}
void qemu_chr_be_write_impl(CharDriverState *s, uint8_t *buf, int len)
{
- if (s->chr_read) {
- s->chr_read(s->handler_opaque, buf, len);
+ CharBackend *be = s->be;
+
+ if (be && be->chr_read) {
+ be->chr_read(be->opaque, buf, len);
}
}
@@ -488,7 +498,6 @@ void qemu_chr_fe_printf(CharBackend *be, const char *fmt,
...)
}
static void remove_fd_in_watch(CharDriverState *chr);
-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);
@@ -519,10 +528,7 @@ static CharDriverState *qemu_chr_open_null(const char *id,
#define MUX_BUFFER_SIZE 32 /* Must be a power of 2. */
#define MUX_BUFFER_MASK (MUX_BUFFER_SIZE - 1)
struct MuxDriver {
- IOCanReadHandler *chr_can_read[MAX_MUX];
- IOReadHandler *chr_read[MAX_MUX];
- IOEventHandler *chr_event[MAX_MUX];
- void *ext_opaque[MAX_MUX];
+ CharBackend *backends[MAX_MUX];
CharBackend chr;
int focus;
int mux_cnt;
@@ -625,8 +631,11 @@ static void mux_print_help(CharDriverState *chr)
static void mux_chr_send_event(MuxDriver *d, int mux_nr, int event)
{
- if (d->chr_event[mux_nr])
- d->chr_event[mux_nr](d->ext_opaque[mux_nr], event);
+ CharBackend *be = d->backends[mux_nr];
+
+ if (be && be->chr_event) {
+ be->chr_event(be->opaque, event);
+ }
}
static int mux_proc_byte(CharDriverState *chr, MuxDriver *d, int ch)
@@ -677,12 +686,12 @@ static void mux_chr_accept_input(CharDriverState *chr)
{
MuxDriver *d = chr->opaque;
int m = d->focus;
+ CharBackend *be = d->backends[m];
- while (d->prod[m] != d->cons[m] &&
- d->chr_can_read[m] &&
- d->chr_can_read[m](d->ext_opaque[m])) {
- d->chr_read[m](d->ext_opaque[m],
- &d->buffer[m][d->cons[m]++ & MUX_BUFFER_MASK], 1);
+ while (be && d->prod[m] != d->cons[m] &&
+ be->chr_can_read && be->chr_can_read(be->opaque)) {
+ be->chr_read(be->opaque,
+ &d->buffer[m][d->cons[m]++ & MUX_BUFFER_MASK], 1);
}
}
@@ -691,11 +700,16 @@ static int mux_chr_can_read(void *opaque)
CharDriverState *chr = opaque;
MuxDriver *d = chr->opaque;
int m = d->focus;
+ CharBackend *be = d->backends[m];
- if ((d->prod[m] - d->cons[m]) < MUX_BUFFER_SIZE)
+ if ((d->prod[m] - d->cons[m]) < MUX_BUFFER_SIZE) {
return 1;
- if (d->chr_can_read[m])
- return d->chr_can_read[m](d->ext_opaque[m]);
+ }
+
+ if (be && be->chr_can_read) {
+ return be->chr_can_read(be->opaque);
+ }
+
return 0;
}
@@ -704,16 +718,17 @@ static void mux_chr_read(void *opaque, const uint8_t
*buf, int size)
CharDriverState *chr = opaque;
MuxDriver *d = chr->opaque;
int m = d->focus;
+ CharBackend *be = d->backends[m];
int i;
- mux_chr_accept_input (opaque);
+ mux_chr_accept_input(opaque);
- for(i = 0; i < size; i++)
+ for (i = 0; i < size; i++)
if (mux_proc_byte(chr, d, buf[i])) {
if (d->prod[m] == d->cons[m] &&
- d->chr_can_read[m] &&
- d->chr_can_read[m](d->ext_opaque[m]))
- d->chr_read[m](d->ext_opaque[m], &buf[i], 1);
+ be && be->chr_can_read &&
+ be->chr_can_read(be->opaque))
+ be->chr_read(be->opaque, &buf[i], 1);
else
d->buffer[m][d->prod[m]++ & MUX_BUFFER_MASK] = buf[i];
}
@@ -730,21 +745,6 @@ static void mux_chr_event(void *opaque, int event)
mux_chr_send_event(d, i, event);
}
-static void mux_chr_update_read_handler(CharDriverState *chr,
- GMainContext *context,
- int tag)
-{
- MuxDriver *d = chr->opaque;
-
- 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;
/**
@@ -796,12 +796,19 @@ static GSource *mux_chr_add_watch(CharDriverState *s,
GIOCondition cond)
static void mux_chr_close(struct CharDriverState *chr)
{
MuxDriver *d = chr->opaque;
+ int i;
+ for (i = 0; i < d->mux_cnt; i++) {
+ CharBackend *be = d->backends[i];
+ if (be) {
+ be->chr = NULL;
+ }
+ }
qemu_chr_fe_deinit(&d->chr);
g_free(d);
}
-static int mux_chr_new_handler_tag(CharDriverState *chr, Error **errp)
+static int mux_chr_new_fe(CharDriverState *chr, CharBackend *be, Error **errp)
{
MuxDriver *d = chr->opaque;
@@ -810,6 +817,8 @@ static int mux_chr_new_handler_tag(CharDriverState *chr,
Error **errp)
return -1;
}
+ d->backends[d->mux_cnt] = be;
+
return d->mux_cnt++;
}
@@ -864,7 +873,6 @@ static CharDriverState *qemu_chr_open_mux(const char *id,
d->focus = -1;
chr->chr_close = mux_chr_close;
chr->chr_write = mux_chr_write;
- chr->chr_update_read_handler = mux_chr_update_read_handler;
chr->chr_accept_input = mux_chr_accept_input;
/* Frontend guest-open / -close notification is not support with muxes */
chr->chr_set_fe_open = NULL;
@@ -905,10 +913,12 @@ bool qemu_chr_fe_init(CharBackend *b, CharDriverState *s,
Error **errp)
s->avail_connections--;
if (s->is_mux) {
- tag = mux_chr_new_handler_tag(s, errp);
+ tag = mux_chr_new_fe(s, b, errp);
if (tag < 0) {
return false;
}
+ } else {
+ s->be = b;
}
b->tag = tag;
@@ -924,6 +934,11 @@ void qemu_chr_fe_deinit(CharBackend *b)
if (b->chr) {
qemu_chr_fe_set_handlers(b, NULL, NULL, NULL, NULL, NULL);
b->chr->avail_connections++;
+ b->chr->be = NULL;
+ if (b->chr->is_mux) {
+ MuxDriver *d = b->chr->opaque;
+ d->backends[b->tag] = NULL;
+ }
b->chr = NULL;
}
}
@@ -951,12 +966,12 @@ void qemu_chr_fe_set_handlers(CharBackend *b,
} else {
fe_open = 1;
}
- s->chr_can_read = fd_can_read;
- s->chr_read = fd_read;
- s->chr_event = fd_event;
- s->handler_opaque = opaque;
+ b->chr_can_read = fd_can_read;
+ b->chr_read = fd_read;
+ b->chr_event = fd_event;
+ b->opaque = opaque;
if (s->chr_update_read_handler) {
- s->chr_update_read_handler(s, context, b->tag);
+ s->chr_update_read_handler(s, context);
}
if (!s->explicit_fe_open) {
@@ -1217,8 +1232,7 @@ static GSource *fd_chr_add_watch(CharDriverState *chr,
GIOCondition cond)
}
static void fd_chr_update_read_handler(CharDriverState *chr,
- GMainContext *context,
- int tag)
+ GMainContext *context)
{
FDCharDriver *s = chr->opaque;
@@ -1475,8 +1489,7 @@ static void
pty_chr_update_read_handler_locked(CharDriverState *chr)
}
static void pty_chr_update_read_handler(CharDriverState *chr,
- GMainContext *context,
- int tag)
+ GMainContext *context)
{
qemu_mutex_lock(&chr->chr_write_lock);
pty_chr_update_read_handler_locked(chr);
@@ -2722,8 +2735,7 @@ static gboolean udp_chr_read(QIOChannel *chan,
GIOCondition cond, void *opaque)
}
static void udp_chr_update_read_handler(CharDriverState *chr,
- GMainContext *context,
- int tag)
+ GMainContext *context)
{
NetCharDriver *s = chr->opaque;
@@ -3142,8 +3154,7 @@ static void tcp_chr_connect(void *opaque)
}
static void tcp_chr_update_read_handler(CharDriverState *chr,
- GMainContext *context,
- int tag)
+ GMainContext *context)
{
TCPCharDriver *s = chr->opaque;
@@ -4261,6 +4272,9 @@ void qemu_chr_fe_disconnect(CharBackend *be)
static void qemu_chr_free_common(CharDriverState *chr)
{
+ if (chr->be) {
+ chr->be->chr = NULL;
+ }
g_free(chr->filename);
g_free(chr->label);
if (chr->logfd != -1) {
@@ -4805,8 +4819,7 @@ void qmp_chardev_remove(const char *id, Error **errp)
error_setg(errp, "Chardev '%s' not found", id);
return;
}
- if (chr->chr_can_read || chr->chr_read ||
- chr->chr_event || chr->handler_opaque) {
+ if (chr->be) {
error_setg(errp, "Chardev '%s' is busy", id);
return;
}
diff --git a/ui/console.c b/ui/console.c
index 19adac7..f490346 100644
--- a/ui/console.c
+++ b/ui/console.c
@@ -1083,6 +1083,7 @@ static void kbd_send_chars(void *opaque)
void kbd_put_keysym_console(QemuConsole *s, int keysym)
{
uint8_t buf[16], *q;
+ CharBackend *be;
int c;
if (!s || (s->console_type == GRAPHIC_CONSOLE))
@@ -1125,7 +1126,8 @@ void kbd_put_keysym_console(QemuConsole *s, int keysym)
if (s->echo) {
console_puts(s->chr, buf, q - buf);
}
- if (s->chr->chr_read) {
+ be = s->chr->be;
+ if (be && be->chr_read) {
qemu_fifo_write(&s->out_fifo, buf, q - buf);
kbd_send_chars(s);
}
diff --git a/include/sysemu/char.h b/include/sysemu/char.h
index 2f60a10..7187c3e 100644
--- a/include/sysemu/char.h
+++ b/include/sysemu/char.h
@@ -76,6 +76,10 @@ typedef enum {
* CharDriverState */
typedef struct CharBackend {
CharDriverState *chr;
+ IOEventHandler *chr_event;
+ IOCanReadHandler *chr_can_read;
+ IOReadHandler *chr_read;
+ void *opaque;
int tag;
} CharBackend;
@@ -86,22 +90,19 @@ struct CharDriverState {
const uint8_t *buf, int len);
GSource *(*chr_add_watch)(struct CharDriverState *s, GIOCondition cond);
void (*chr_update_read_handler)(struct CharDriverState *s,
- GMainContext *context, int tag);
+ GMainContext *context);
int (*chr_ioctl)(struct CharDriverState *s, int cmd, void *arg);
int (*get_msgfds)(struct CharDriverState *s, int* fds, int num);
int (*set_msgfds)(struct CharDriverState *s, int *fds, int num);
int (*chr_add_client)(struct CharDriverState *chr, int fd);
int (*chr_wait_connected)(struct CharDriverState *chr, Error **errp);
- IOEventHandler *chr_event;
- IOCanReadHandler *chr_can_read;
- IOReadHandler *chr_read;
- void *handler_opaque;
void (*chr_close)(struct CharDriverState *chr);
void (*chr_disconnect)(struct CharDriverState *chr);
void (*chr_accept_input)(struct CharDriverState *chr);
void (*chr_set_echo)(struct CharDriverState *chr, bool echo);
void (*chr_set_fe_open)(struct CharDriverState *chr, int fe_open);
void (*chr_fe_event)(struct CharDriverState *chr, int event);
+ CharBackend *be;
void *opaque;
char *label;
char *filename;
--
2.10.0
- [Qemu-devel] [PATCH 14/38] colo: claim in find_and_check_chardev, (continued)
- [Qemu-devel] [PATCH 14/38] colo: claim in find_and_check_chardev, Marc-André Lureau, 2016/10/22
- [Qemu-devel] [PATCH 12/38] char: remaining switch to CharBackend in frontend, Marc-André Lureau, 2016/10/22
- [Qemu-devel] [PATCH 13/38] char: rename some frontend functions, Marc-André Lureau, 2016/10/22
- [Qemu-devel] [PATCH 16/38] char: fold qemu_chr_set_handlers in qemu_chr_fe_set_handlers, Marc-André Lureau, 2016/10/22
- [Qemu-devel] [PATCH 17/38] vhost-user: only initialize queue 0 CharBackend, Marc-André Lureau, 2016/10/22
- [Qemu-devel] [PATCH 15/38] char: use qemu_chr_fe* functions with CharBackend argument, Marc-André Lureau, 2016/10/22
- [Qemu-devel] [PATCH 18/38] char: replace qemu_chr_claim/release with qemu_chr_fe_init/deinit, Marc-André Lureau, 2016/10/22
- [Qemu-devel] [PATCH 19/38] char: make some qemu_chr_fe skip if no driver, Marc-André Lureau, 2016/10/22
- [Qemu-devel] [PATCH 20/38] tests: start chardev unit tests, Marc-André Lureau, 2016/10/22
- [Qemu-devel] [PATCH 21/38] char: move front end handlers in CharBackend,
Marc-André Lureau <=
- [Qemu-devel] [PATCH 22/38] char: rename chr_close/chr_free, Marc-André Lureau, 2016/10/22
- [Qemu-devel] [PATCH 23/38] char: remove explicit_fe_open, use a set_handlers argument, Marc-André Lureau, 2016/10/22
- [Qemu-devel] [PATCH 24/38] char: move fe_open in CharBackend, Marc-André Lureau, 2016/10/22
- [Qemu-devel] [PATCH 25/38] char: remove unused CHR_EVENT_FOCUS, Marc-André Lureau, 2016/10/22
- [Qemu-devel] [PATCH 26/38] char: use an enum for CHR_EVENT, Marc-André Lureau, 2016/10/22
- [Qemu-devel] [PATCH 27/38] char: remove unused qemu_chr_fe_event, Marc-André Lureau, 2016/10/22
- [Qemu-devel] [PATCH 28/38] char: replace avail_connections, Marc-André Lureau, 2016/10/22
- [Qemu-devel] [PATCH 29/38] char: use common error path in qmp_chardev_add, Marc-André Lureau, 2016/10/22
- [Qemu-devel] [PATCH 30/38] char: remove explicit_be_open from CharDriverState, Marc-André Lureau, 2016/10/22