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chardev: add support for qapi-based chardev initialization

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This patch add support for a new way to initialize chardev devices.
Instead of calling a initialization function with a QemuOpts we will
now create a (qapi) ChardevBackend, optionally call a function to
fill ChardevBackend from QemuOpts, then go create the chardev using
the new qapi code path which is also used by chardev-add.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2013-02-21 11:39:12 +01:00
parent 8ca761f661
commit 2c5f488293
2 changed files with 45 additions and 0 deletions
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2
include/char/char.h
View File

@ -245,6 +245,8 @@ CharDriverState *qemu_chr_find(const char *name);
QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename);
void register_char_driver(const char *name, CharDriverState *(*open)(QemuOpts *));
void register_char_driver_qapi(const char *name, int kind,
void (*parse)(QemuOpts *opts, ChardevBackend *backend, Error **errp));
/* add an eventfd to the qemu devices that are polled */
CharDriverState *qemu_chr_open_eventfd(int eventfd);

43
qemu-char.c
View File

@ -3204,7 +3204,11 @@ static CharDriverState *qemu_chr_open_pp(QemuOpts *opts)
typedef struct CharDriver {
const char *name;
/* old, pre qapi */
CharDriverState *(*open)(QemuOpts *opts);
/* new, qapi-based */
int kind;
void (*parse)(QemuOpts *opts, ChardevBackend *backend, Error **errp);
} CharDriver;
static GSList *backends;
@ -3220,6 +3224,19 @@ void register_char_driver(const char *name, CharDriverState *(*open)(QemuOpts *)
backends = g_slist_append(backends, s);
}
void register_char_driver_qapi(const char *name, int kind,
void (*parse)(QemuOpts *opts, ChardevBackend *backend, Error **errp))
{
CharDriver *s;
s = g_malloc0(sizeof(*s));
s->name = g_strdup(name);
s->kind = kind;
s->parse = parse;
backends = g_slist_append(backends, s);
}
CharDriverState *qemu_chr_new_from_opts(QemuOpts *opts,
void (*init)(struct CharDriverState *s),
Error **errp)
@ -3251,6 +3268,32 @@ CharDriverState *qemu_chr_new_from_opts(QemuOpts *opts,
return NULL;
}
if (!cd->open) {
/* using new, qapi init */
ChardevBackend *backend = g_new0(ChardevBackend, 1);
ChardevReturn *ret = NULL;
const char *id = qemu_opts_id(opts);
chr = NULL;
backend->kind = cd->kind;
if (cd->parse) {
cd->parse(opts, backend, errp);
if (error_is_set(errp)) {
goto qapi_out;
}
}
ret = qmp_chardev_add(qemu_opts_id(opts), backend, errp);
if (error_is_set(errp)) {
goto qapi_out;
}
chr = qemu_chr_find(id);
qapi_out:
qapi_free_ChardevBackend(backend);
qapi_free_ChardevReturn(ret);
return chr;
}
chr = cd->open(opts);
if (!chr) {
error_setg(errp, "chardev: opening backend \"%s\" failed",