From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:48503) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TPyi3-0008B5-Q0 for qemu-devel@nongnu.org; Sun, 21 Oct 2012 12:49:09 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1TPyhz-0006dH-8r for qemu-devel@nongnu.org; Sun, 21 Oct 2012 12:49:07 -0400 Received: from e23smtp04.au.ibm.com ([202.81.31.146]:49768) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TPyhy-0006cr-Gi for qemu-devel@nongnu.org; Sun, 21 Oct 2012 12:49:03 -0400 Received: from /spool/local by e23smtp04.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 22 Oct 2012 02:44:58 +1000 Received: from d23av01.au.ibm.com (d23av01.au.ibm.com [9.190.234.96]) by d23relay04.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id q9LGd1e946203022 for ; Mon, 22 Oct 2012 03:39:02 +1100 Received: from d23av01.au.ibm.com (loopback [127.0.0.1]) by d23av01.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id q9LGmuxf006887 for ; Mon, 22 Oct 2012 03:48:56 +1100 From: Lei Li Date: Mon, 22 Oct 2012 00:48:00 +0800 Message-Id: <1350838081-6351-5-git-send-email-lilei@linux.vnet.ibm.com> In-Reply-To: <1350838081-6351-1-git-send-email-lilei@linux.vnet.ibm.com> References: <1350838081-6351-1-git-send-email-lilei@linux.vnet.ibm.com> Subject: [Qemu-devel] [PATCH 4/5] QAPI: Introduce memchar-read QMP command List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: blauwirbel@gmail.com, aliguori@us.ibm.com, Lei Li , lcapitulino@redhat.com Signed-off-by: Lei Li --- hmp-commands.hx | 25 +++++++++++++++++++++++++ hmp.c | 17 +++++++++++++++++ hmp.h | 1 + qapi-schema.json | 27 +++++++++++++++++++++++++++ qemu-char.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++ qmp-commands.hx | 40 ++++++++++++++++++++++++++++++++++++++++ 6 files changed, 162 insertions(+), 0 deletions(-) diff --git a/hmp-commands.hx b/hmp-commands.hx index 753aab3..5f91428 100644 --- a/hmp-commands.hx +++ b/hmp-commands.hx @@ -847,6 +847,31 @@ that specifies behavior when the queue is full/empty. By default is ETEXI { + .name = "memchar_read", + .args_type = "chardev:s,control:-b,size:i", + .params = "chardev [-b] size", + .help = "Provide read interface for CirMemCharDriver. Read from" + "it and return 'size' of the data. (Use -b for 'block'" + "option)", + .mhandler.cmd = hmp_memchar_read, + }, + +STEXI +@item memchar_read [-b] @var{chardev} +@findex memchar_read +Provide read interface for CirMemCharDriver. Read from cirmemchr +char device and return @var{size} of the data. + +@var{size} is the size of data want to read from. + +@var{control} is option['block', 'drop'] for read and write command +that specifies behavior when the queue is full/empty. By default is +'drop'. Note that the 'block' option is not supported now. + -b for 'block' option. None for 'drop' option. + +ETEXI + + { .name = "migrate", .args_type = "detach:-d,blk:-b,inc:-i,uri:s", .params = "[-d] [-b] [-i] uri", diff --git a/hmp.c b/hmp.c index 18ca61b..fa858c4 100644 --- a/hmp.c +++ b/hmp.c @@ -690,6 +690,23 @@ void hmp_memchar_write(Monitor *mon, const QDict *qdict) hmp_handle_error(mon, &errp); } +void hmp_memchar_read(Monitor *mon, const QDict *qdict) +{ + uint32_t size = qdict_get_int(qdict, "size"); + const char *chardev = qdict_get_str(qdict, "chardev"); + char *data; + enum DataFormat format; + int con = qdict_get_try_bool(qdict, "block", 0); + enum CongestionControl control; + Error *errp = NULL; + + format = DATA_FORMAT_UTF8; + control = con ? CONGESTION_CONTROL_BLOCK : CONGESTION_CONTROL_DROP; + data = qmp_memchar_read(chardev, size, true, format, + true, control, &errp); + monitor_printf(mon, "%s\n", data); +} + static void hmp_cont_cb(void *opaque, int err) { if (!err) { diff --git a/hmp.h b/hmp.h index 406ebb1..a5a0cfe 100644 --- a/hmp.h +++ b/hmp.h @@ -44,6 +44,7 @@ void hmp_cpu(Monitor *mon, const QDict *qdict); void hmp_memsave(Monitor *mon, const QDict *qdict); void hmp_pmemsave(Monitor *mon, const QDict *qdict); void hmp_memchar_write(Monitor *mon, const QDict *qdict); +void hmp_memchar_read(Monitor *mon, const QDict *qdict); void hmp_cont(Monitor *mon, const QDict *qdict); void hmp_system_wakeup(Monitor *mon, const QDict *qdict); void hmp_inject_nmi(Monitor *mon, const QDict *qdict); diff --git a/qapi-schema.json b/qapi-schema.json index a908aa6..4db91b0 100644 --- a/qapi-schema.json +++ b/qapi-schema.json @@ -394,6 +394,33 @@ '*control': 'CongestionControl'} } ## +# @memchar-read: +# +# Provide read interface for memchardev. Read from memchar +# char device and return the data. +# +# @chardev: the name of the memchar char device. +# +# @size: the size to read in bytes. +# +# @format: #optional the format of the data want to read from +# memchardev, by default is 'utf8'. +# +# @control: #optional options for read and write command that specifies +# behavior when the queue is full/empty. +# +# Returns: The data read from memchar as string +# If @chardev is not a valid memchr device, DeviceNotFound +# If an I/O error occurs while reading, IOError +# +# Since: 1.3 +## +{ 'command': 'memchar-read', + 'data': {'chardev': 'str', 'size': 'int', '*format': 'DataFormat', + '*control': 'CongestionControl'}, + 'returns': 'str' } + +## # @CommandInfo: # # Information about a QMP command diff --git a/qemu-char.c b/qemu-char.c index 133d282..a8bcead 100644 --- a/qemu-char.c +++ b/qemu-char.c @@ -2736,6 +2736,58 @@ void qmp_memchar_write(const char *chardev, int64_t size, } } +char *qmp_memchar_read(const char *chardev, int64_t size, + bool has_format, enum DataFormat format, + bool has_control, enum CongestionControl control, + Error **errp) +{ + CharDriverState *chr; + guchar *read_data; + char *data = NULL; + int ret; + + read_data = g_malloc0(size); + + chr = qemu_chr_find(chardev); + if (!chr) { + error_set(errp, QERR_DEVICE_NOT_FOUND, chardev); + return NULL; + } + + /* XXX: For the sync command as 'block', waiting for the qmp + * * to support necessary feature. Now just act as 'drop'. */ + if (cirmem_chr_is_empty(chr)) { + if (has_control && (control == CONGESTION_CONTROL_BLOCK)) { + error_setg(errp, "Failed to read from memchr %s", chardev); + return NULL; + } else { + error_setg(errp, "Failed to read from memchr %s", chardev); + return NULL; + } + } + + if (size == 0) { + size = CBUFF_SIZE; + } + + ret = cirmem_chr_read(chr, read_data, size); + + if (ret < 0) { + error_setg(errp, "Failed to read from memchr %s", chardev); + return NULL; + } + + if (has_format && (format == DATA_FORMAT_BASE64)) { + if (read_data) { + data = g_base64_encode(read_data, (size_t)size); + } + } else { + data = (char *)read_data; + } + + return data; +} + QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename) { char host[65], port[33], width[8], height[8]; diff --git a/qmp-commands.hx b/qmp-commands.hx index 502ed57..08ea798 100644 --- a/qmp-commands.hx +++ b/qmp-commands.hx @@ -506,6 +506,46 @@ Example: EQMP { + .name = "memchar-read", + .args_type = "chardev:s,size:i,format:s?,control:s?", + .help = "return the size of data from memchar chardev", + .mhandler.cmd_new = qmp_marshal_input_memchar_read, + }, + +SQMP +memchar-read +------------- + +Provide read interface for memchardev. Read from memchar +char device and return the data. + +Arguments: + +- "chardev": the name of the char device, must be unique (json-string) +- "size": the memory size wanted to read in bytes(refer to unencoded + size of the raw data), would adjust to the init size of the + memchar if the requested size is larger than it. (json-int) +- "format": the data format write to memchardev, default is + utf8. (json-string, optional) + - Possible values: "utf8", "base64" + +- "control": options for read and write command that specifies + behavior when the queue is full/empty, default is + drop. (json-string, optional) + - Possible values: "drop", "block" + +Example: + +-> { "execute": "memchar-read", + "arguments": { "chardev": foo, + "size": 1000, + "format": "utf8", + "control": "drop" } } +<- { "return": "data string..." } + +EQMP + + { .name = "xen-save-devices-state", .args_type = "filename:F", .mhandler.cmd_new = qmp_marshal_input_xen_save_devices_state, -- 1.7.7.6