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chardev: add memory (ringbuf) support to qapi

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This patch adds 'memory' support to qapi and also switches over
the memory chardev initialization to the new qapi code path.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2013-02-26 16:21:11 +01:00
parent 702ec69cc1
commit 1da48c658a
2 changed files with 36 additions and 8 deletions
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14
qapi-schema.json
View File

@ -3247,6 +3247,17 @@
'*cols' : 'int',
'*rows' : 'int' } }
##
# @ChardevRingbuf:
#
# Configuration info for memory chardevs
#
# @size: #optional Ringbuffer size, must be power of two, default is 65536
#
# Since: 1.5
##
{ 'type': 'ChardevRingbuf', 'data': { '*size' : 'int' } }
##
# @ChardevBackend:
#
@ -3270,7 +3281,8 @@
'console': 'ChardevDummy',
'spicevmc' : 'ChardevSpiceChannel',
'spiceport' : 'ChardevSpicePort',
'vc' : 'ChardevVC' } }
'vc' : 'ChardevVC',
'memory' : 'ChardevRingbuf' } }
##
# @ChardevReturn:

30
qemu-char.c
View File

@ -2884,7 +2884,8 @@ static void ringbuf_chr_close(struct CharDriverState *chr)
chr->opaque = NULL;
}
static CharDriverState *qemu_chr_open_ringbuf(QemuOpts *opts)
static CharDriverState *qemu_chr_open_ringbuf(ChardevRingbuf *opts,
Error **errp)
{
CharDriverState *chr;
RingBufCharDriver *d;
@ -2892,14 +2893,11 @@ static CharDriverState *qemu_chr_open_ringbuf(QemuOpts *opts)
chr = g_malloc0(sizeof(CharDriverState));
d = g_malloc(sizeof(*d));
d->size = qemu_opt_get_size(opts, "size", 0);
if (d->size == 0) {
d->size = 65536;
}
d->size = opts->has_size ? opts->size : 65536;
/* The size must be power of 2 */
if (d->size & (d->size - 1)) {
error_report("size of ringbuf device must be power of two");
error_setg(errp, "size of ringbuf chardev must be power of two");
goto fail;
}
@ -3201,6 +3199,20 @@ static void qemu_chr_parse_pipe(QemuOpts *opts, ChardevBackend *backend,
backend->pipe->device = g_strdup(device);
}
static void qemu_chr_parse_ringbuf(QemuOpts *opts, ChardevBackend *backend,
Error **errp)
{
int val;
backend->memory = g_new0(ChardevRingbuf, 1);
val = qemu_opt_get_number(opts, "size", 0);
if (val != 0) {
backend->memory->has_size = true;
backend->memory->size = val;
}
}
typedef struct CharDriver {
const char *name;
/* old, pre qapi */
@ -3740,6 +3752,9 @@ ChardevReturn *qmp_chardev_add(const char *id, ChardevBackend *backend,
case CHARDEV_BACKEND_KIND_VC:
chr = vc_init(backend->vc);
break;
case CHARDEV_BACKEND_KIND_MEMORY:
chr = qemu_chr_open_ringbuf(backend->memory, errp);
break;
default:
error_setg(errp, "unknown chardev backend (%d)", backend->kind);
break;
@ -3782,7 +3797,8 @@ static void register_types(void)
register_char_driver_qapi("null", CHARDEV_BACKEND_KIND_NULL, NULL);
register_char_driver("socket", qemu_chr_open_socket);
register_char_driver("udp", qemu_chr_open_udp);
register_char_driver("memory", qemu_chr_open_ringbuf);
register_char_driver_qapi("memory", CHARDEV_BACKEND_KIND_MEMORY,
qemu_chr_parse_ringbuf);
register_char_driver_qapi("file", CHARDEV_BACKEND_KIND_FILE,
qemu_chr_parse_file_out);
register_char_driver_qapi("stdio", CHARDEV_BACKEND_KIND_STDIO,