hw/qdev-properties-system.c - qemu - Git at Google

 /*
  * qdev property parsing and global properties
  * (parts specific for qemu-system-*)
  *
  * This file is based on code from hw/qdev-properties.c from
  * commit 074a86fccd185616469dfcdc0e157f438aebba18,
  * Copyright (c) Gerd Hoffmann <kraxel@redhat.com> and other contributors.
  *
  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  * See the COPYING file in the top-level directory.
  */

 #include "net/net.h"
 #include "qdev.h"
 #include "qapi/qmp/qerror.h"
 #include "sysemu/blockdev.h"
 #include "hw/block-common.h"
 #include "net/hub.h"
 #include "qapi/visitor.h"
 #include "char/char.h"

 static void get_pointer(Object *obj, Visitor *v, Property *prop,
                         const char *(*print)(void *ptr),
                         const char *name, Error **errp)
 {
     DeviceState *dev = DEVICE(obj);
     void **ptr = qdev_get_prop_ptr(dev, prop);
     char *p;

     p = (char *) (*ptr ? print(*ptr) : "");
     visit_type_str(v, &p, name, errp);
 }

 static void set_pointer(Object *obj, Visitor *v, Property *prop,
                         int (*parse)(DeviceState *dev, const char *str,
                                      void **ptr),
                         const char *name, Error **errp)
 {
     DeviceState *dev = DEVICE(obj);
     Error *local_err = NULL;
     void **ptr = qdev_get_prop_ptr(dev, prop);
     char *str;
     int ret;

     if (dev->realized) {
         error_set(errp, QERR_PERMISSION_DENIED);
         return;
     }

     visit_type_str(v, &str, name, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
         return;
     }
     if (!*str) {
         g_free(str);
         *ptr = NULL;
         return;
     }
     ret = parse(dev, str, ptr);
     error_set_from_qdev_prop_error(errp, ret, dev, prop, str);
     g_free(str);
 }

 /* --- drive --- */

 static int parse_drive(DeviceState *dev, const char *str, void **ptr)
 {
     BlockDriverState *bs;

     bs = bdrv_find(str);
     if (bs == NULL) {
         return -ENOENT;
     }
     if (bdrv_attach_dev(bs, dev) < 0) {
         return -EEXIST;
     }
     *ptr = bs;
     return 0;
 }

 static void release_drive(Object *obj, const char *name, void *opaque)
 {
     DeviceState *dev = DEVICE(obj);
     Property *prop = opaque;
     BlockDriverState **ptr = qdev_get_prop_ptr(dev, prop);

     if (*ptr) {
         bdrv_detach_dev(*ptr, dev);
         blockdev_auto_del(*ptr);
     }
 }

 static const char *print_drive(void *ptr)
 {
     return bdrv_get_device_name(ptr);
 }

 static void get_drive(Object *obj, Visitor *v, void *opaque,
                       const char *name, Error **errp)
 {
     get_pointer(obj, v, opaque, print_drive, name, errp);
 }

 static void set_drive(Object *obj, Visitor *v, void *opaque,
                       const char *name, Error **errp)
 {
     set_pointer(obj, v, opaque, parse_drive, name, errp);
 }

 PropertyInfo qdev_prop_drive = {
     .name  = "drive",
     .get   = get_drive,
     .set   = set_drive,
     .release = release_drive,
 };

 /* --- character device --- */

 static int parse_chr(DeviceState *dev, const char *str, void **ptr)
 {
     CharDriverState *chr = qemu_chr_find(str);
     if (chr == NULL) {
         return -ENOENT;
     }
     if (chr->avail_connections < 1) {
         return -EEXIST;
     }
     *ptr = chr;
     --chr->avail_connections;
     return 0;
 }

 static void release_chr(Object *obj, const char *name, void *opaque)
 {
     DeviceState *dev = DEVICE(obj);
     Property *prop = opaque;
     CharDriverState **ptr = qdev_get_prop_ptr(dev, prop);

     if (*ptr) {
         qemu_chr_add_handlers(*ptr, NULL, NULL, NULL, NULL);
     }
 }


 static const char *print_chr(void *ptr)
 {
     CharDriverState *chr = ptr;

     return chr->label ? chr->label : "";
 }

 static void get_chr(Object *obj, Visitor *v, void *opaque,
                     const char *name, Error **errp)
 {
     get_pointer(obj, v, opaque, print_chr, name, errp);
 }

 static void set_chr(Object *obj, Visitor *v, void *opaque,
                     const char *name, Error **errp)
 {
     set_pointer(obj, v, opaque, parse_chr, name, errp);
 }

 PropertyInfo qdev_prop_chr = {
     .name  = "chr",
     .get   = get_chr,
     .set   = set_chr,
     .release = release_chr,
 };

 /* --- netdev device --- */

 static int parse_netdev(DeviceState *dev, const char *str, void **ptr)
 {
     NICPeers *peers_ptr = (NICPeers *)ptr;
     NICConf *conf = container_of(peers_ptr, NICConf, peers);
     NetClientState **ncs = peers_ptr->ncs;
     NetClientState *peers[MAX_QUEUE_NUM];
     int queues, i = 0;
     int ret;

     queues = qemu_find_net_clients_except(str, peers,
                                           NET_CLIENT_OPTIONS_KIND_NIC,
                                           MAX_QUEUE_NUM);
     if (queues == 0) {
         ret = -ENOENT;
         goto err;
     }

     if (queues > MAX_QUEUE_NUM) {
         ret = -E2BIG;
         goto err;
     }

     for (i = 0; i < queues; i++) {
         if (peers[i] == NULL) {
             ret = -ENOENT;
             goto err;
         }

         if (peers[i]->peer) {
             ret = -EEXIST;
             goto err;
         }

         ncs[i] = peers[i];
         ncs[i]->queue_index = i;
     }

     conf->queues = queues;

     return 0;

 err:
     return ret;
 }

 static const char *print_netdev(void *ptr)
 {
     NetClientState *netdev = ptr;

     return netdev->name ? netdev->name : "";
 }

 static void get_netdev(Object *obj, Visitor *v, void *opaque,
                        const char *name, Error **errp)
 {
     get_pointer(obj, v, opaque, print_netdev, name, errp);
 }

 static void set_netdev(Object *obj, Visitor *v, void *opaque,
                        const char *name, Error **errp)
 {
     set_pointer(obj, v, opaque, parse_netdev, name, errp);
 }

 PropertyInfo qdev_prop_netdev = {
     .name  = "netdev",
     .get   = get_netdev,
     .set   = set_netdev,
 };

 /* --- vlan --- */

 static int print_vlan(DeviceState *dev, Property *prop, char *dest, size_t len)
 {
     NetClientState **ptr = qdev_get_prop_ptr(dev, prop);

     if (*ptr) {
         int id;
         if (!net_hub_id_for_client(*ptr, &id)) {
             return snprintf(dest, len, "%d", id);
         }
     }

     return snprintf(dest, len, "<null>");
 }

 static void get_vlan(Object *obj, Visitor *v, void *opaque,
                      const char *name, Error **errp)
 {
     DeviceState *dev = DEVICE(obj);
     Property *prop = opaque;
     NetClientState **ptr = qdev_get_prop_ptr(dev, prop);
     int32_t id = -1;

     if (*ptr) {
         int hub_id;
         if (!net_hub_id_for_client(*ptr, &hub_id)) {
             id = hub_id;
         }
     }

     visit_type_int32(v, &id, name, errp);
 }

 static void set_vlan(Object *obj, Visitor *v, void *opaque,
                      const char *name, Error **errp)
 {
     DeviceState *dev = DEVICE(obj);
     Property *prop = opaque;
     NICPeers *peers_ptr = qdev_get_prop_ptr(dev, prop);
     NetClientState **ptr = &peers_ptr->ncs[0];
     Error *local_err = NULL;
     int32_t id;
     NetClientState *hubport;

     if (dev->realized) {
         error_set(errp, QERR_PERMISSION_DENIED);
         return;
     }

     visit_type_int32(v, &id, name, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
         return;
     }
     if (id == -1) {
         *ptr = NULL;
         return;
     }

     hubport = net_hub_port_find(id);
     if (!hubport) {
         error_set(errp, QERR_INVALID_PARAMETER_VALUE,
                   name, prop->info->name);
         return;
     }
     *ptr = hubport;
 }

 PropertyInfo qdev_prop_vlan = {
     .name  = "vlan",
     .print = print_vlan,
     .get   = get_vlan,
     .set   = set_vlan,
 };

 int qdev_prop_set_drive(DeviceState *dev, const char *name,
                         BlockDriverState *value)
 {
     Error *errp = NULL;
     const char *bdrv_name = value ? bdrv_get_device_name(value) : "";
     object_property_set_str(OBJECT(dev), bdrv_name,
                             name, &errp);
     if (errp) {
         qerror_report_err(errp);
         error_free(errp);
         return -1;
     }
     return 0;
 }

 void qdev_prop_set_drive_nofail(DeviceState *dev, const char *name,
                                 BlockDriverState *value)
 {
     if (qdev_prop_set_drive(dev, name, value) < 0) {
         exit(1);
     }
 }
 void qdev_prop_set_chr(DeviceState *dev, const char *name,
                        CharDriverState *value)
 {
     Error *errp = NULL;
     assert(!value || value->label);
     object_property_set_str(OBJECT(dev),
                             value ? value->label : "", name, &errp);
     assert_no_error(errp);
 }

 void qdev_prop_set_netdev(DeviceState *dev, const char *name,
                           NetClientState *value)
 {
     Error *errp = NULL;
     assert(!value || value->name);
     object_property_set_str(OBJECT(dev),
                             value ? value->name : "", name, &errp);
     assert_no_error(errp);
 }

 void qdev_set_nic_properties(DeviceState *dev, NICInfo *nd)
 {
     qdev_prop_set_macaddr(dev, "mac", nd->macaddr.a);
     if (nd->netdev) {
         qdev_prop_set_netdev(dev, "netdev", nd->netdev);
     }
     if (nd->nvectors != DEV_NVECTORS_UNSPECIFIED &&
         object_property_find(OBJECT(dev), "vectors", NULL)) {
         qdev_prop_set_uint32(dev, "vectors", nd->nvectors);
     }
     nd->instantiated = 1;
 }

 static int qdev_add_one_global(QemuOpts *opts, void *opaque)
 {
     GlobalProperty *g;

     g = g_malloc0(sizeof(*g));
     g->driver   = qemu_opt_get(opts, "driver");
     g->property = qemu_opt_get(opts, "property");
     g->value    = qemu_opt_get(opts, "value");
     qdev_prop_register_global(g);
     return 0;
 }

 void qemu_add_globals(void)
 {
     qemu_opts_foreach(qemu_find_opts("global"), qdev_add_one_global, NULL, 0);
 }
	/*
	* qdev property parsing and global properties
	* (parts specific for qemu-system-*)
	*
	* This file is based on code from hw/qdev-properties.c from
	* commit 074a86fccd185616469dfcdc0e157f438aebba18,
	* Copyright (c) Gerd Hoffmann <kraxel@redhat.com> and other contributors.
	*
	* This work is licensed under the terms of the GNU GPL, version 2 or later.
	* See the COPYING file in the top-level directory.
	*/

	#include "net/net.h"
	#include "qdev.h"
	#include "qapi/qmp/qerror.h"
	#include "sysemu/blockdev.h"
	#include "hw/block-common.h"
	#include "net/hub.h"
	#include "qapi/visitor.h"
	#include "char/char.h"

	static void get_pointer(Object obj, Visitor v, Property *prop,
	const char (print)(void *ptr),
	const char name, Error *errp)
	{
	DeviceState *dev = DEVICE(obj);
	void **ptr = qdev_get_prop_ptr(dev, prop);
	char *p;

	p = (char ) (ptr ? print(*ptr) : "");
	visit_type_str(v, &p, name, errp);
	}

	static void set_pointer(Object obj, Visitor v, Property *prop,
	int (parse)(DeviceState dev, const char *str,
	void **ptr),
	const char name, Error *errp)
	{
	DeviceState *dev = DEVICE(obj);
	Error *local_err = NULL;
	void **ptr = qdev_get_prop_ptr(dev, prop);
	char *str;
	int ret;

	if (dev->realized) {
	error_set(errp, QERR_PERMISSION_DENIED);
	return;
	}

	visit_type_str(v, &str, name, &local_err);
	if (local_err) {
	error_propagate(errp, local_err);
	return;
	}
	if (!*str) {
	g_free(str);
	*ptr = NULL;
	return;
	}
	ret = parse(dev, str, ptr);
	error_set_from_qdev_prop_error(errp, ret, dev, prop, str);
	g_free(str);
	}

	/* --- drive --- */

	static int parse_drive(DeviceState dev, const char str, void **ptr)
	{
	BlockDriverState *bs;

	bs = bdrv_find(str);
	if (bs == NULL) {
	return -ENOENT;
	}
	if (bdrv_attach_dev(bs, dev) < 0) {
	return -EEXIST;
	}
	*ptr = bs;
	return 0;
	}

	static void release_drive(Object obj, const char name, void *opaque)
	{
	DeviceState *dev = DEVICE(obj);
	Property *prop = opaque;
	BlockDriverState **ptr = qdev_get_prop_ptr(dev, prop);

	if (*ptr) {
	bdrv_detach_dev(*ptr, dev);
	blockdev_auto_del(*ptr);
	}
	}

	static const char print_drive(void ptr)
	{
	return bdrv_get_device_name(ptr);
	}

	static void get_drive(Object obj, Visitor v, void *opaque,
	const char name, Error *errp)
	{
	get_pointer(obj, v, opaque, print_drive, name, errp);
	}

	static void set_drive(Object obj, Visitor v, void *opaque,
	const char name, Error *errp)
	{
	set_pointer(obj, v, opaque, parse_drive, name, errp);
	}

	PropertyInfo qdev_prop_drive = {
	.name = "drive",
	.get = get_drive,
	.set = set_drive,
	.release = release_drive,
	};

	/* --- character device --- */

	static int parse_chr(DeviceState dev, const char str, void **ptr)
	{
	CharDriverState *chr = qemu_chr_find(str);
	if (chr == NULL) {
	return -ENOENT;
	}
	if (chr->avail_connections < 1) {
	return -EEXIST;
	}
	*ptr = chr;
	--chr->avail_connections;
	return 0;
	}

	static void release_chr(Object obj, const char name, void *opaque)
	{
	DeviceState *dev = DEVICE(obj);
	Property *prop = opaque;
	CharDriverState **ptr = qdev_get_prop_ptr(dev, prop);

	if (*ptr) {
	qemu_chr_add_handlers(*ptr, NULL, NULL, NULL, NULL);
	}
	}


	static const char print_chr(void ptr)
	{
	CharDriverState *chr = ptr;

	return chr->label ? chr->label : "";
	}

	static void get_chr(Object obj, Visitor v, void *opaque,
	const char name, Error *errp)
	{
	get_pointer(obj, v, opaque, print_chr, name, errp);
	}

	static void set_chr(Object obj, Visitor v, void *opaque,
	const char name, Error *errp)
	{
	set_pointer(obj, v, opaque, parse_chr, name, errp);
	}

	PropertyInfo qdev_prop_chr = {
	.name = "chr",
	.get = get_chr,
	.set = set_chr,
	.release = release_chr,
	};

	/* --- netdev device --- */

	static int parse_netdev(DeviceState dev, const char str, void **ptr)
	{
	NICPeers peers_ptr = (NICPeers )ptr;
	NICConf *conf = container_of(peers_ptr, NICConf, peers);
	NetClientState **ncs = peers_ptr->ncs;
	NetClientState *peers[MAX_QUEUE_NUM];
	int queues, i = 0;
	int ret;

	queues = qemu_find_net_clients_except(str, peers,
	NET_CLIENT_OPTIONS_KIND_NIC,
	MAX_QUEUE_NUM);
	if (queues == 0) {
	ret = -ENOENT;
	goto err;
	}

	if (queues > MAX_QUEUE_NUM) {
	ret = -E2BIG;
	goto err;
	}

	for (i = 0; i < queues; i++) {
	if (peers[i] == NULL) {
	ret = -ENOENT;
	goto err;
	}

	if (peers[i]->peer) {
	ret = -EEXIST;
	goto err;
	}

	ncs[i] = peers[i];
	ncs[i]->queue_index = i;
	}

	conf->queues = queues;

	return 0;

	err:
	return ret;
	}

	static const char print_netdev(void ptr)
	{
	NetClientState *netdev = ptr;

	return netdev->name ? netdev->name : "";
	}

	static void get_netdev(Object obj, Visitor v, void *opaque,
	const char name, Error *errp)
	{
	get_pointer(obj, v, opaque, print_netdev, name, errp);
	}

	static void set_netdev(Object obj, Visitor v, void *opaque,
	const char name, Error *errp)
	{
	set_pointer(obj, v, opaque, parse_netdev, name, errp);
	}

	PropertyInfo qdev_prop_netdev = {
	.name = "netdev",
	.get = get_netdev,
	.set = set_netdev,
	};

	/* --- vlan --- */

	static int print_vlan(DeviceState dev, Property prop, char *dest, size_t len)
	{
	NetClientState **ptr = qdev_get_prop_ptr(dev, prop);

	if (*ptr) {
	int id;
	if (!net_hub_id_for_client(*ptr, &id)) {
	return snprintf(dest, len, "%d", id);
	}
	}

	return snprintf(dest, len, "<null>");
	}

	static void get_vlan(Object obj, Visitor v, void *opaque,
	const char name, Error *errp)
	{
	DeviceState *dev = DEVICE(obj);
	Property *prop = opaque;
	NetClientState **ptr = qdev_get_prop_ptr(dev, prop);
	int32_t id = -1;

	if (*ptr) {
	int hub_id;
	if (!net_hub_id_for_client(*ptr, &hub_id)) {
	id = hub_id;
	}
	}

	visit_type_int32(v, &id, name, errp);
	}

	static void set_vlan(Object obj, Visitor v, void *opaque,
	const char name, Error *errp)
	{
	DeviceState *dev = DEVICE(obj);
	Property *prop = opaque;
	NICPeers *peers_ptr = qdev_get_prop_ptr(dev, prop);
	NetClientState **ptr = &peers_ptr->ncs[0];
	Error *local_err = NULL;
	int32_t id;
	NetClientState *hubport;

	if (dev->realized) {
	error_set(errp, QERR_PERMISSION_DENIED);
	return;
	}

	visit_type_int32(v, &id, name, &local_err);
	if (local_err) {
	error_propagate(errp, local_err);
	return;
	}
	if (id == -1) {
	*ptr = NULL;
	return;
	}

	hubport = net_hub_port_find(id);
	if (!hubport) {
	error_set(errp, QERR_INVALID_PARAMETER_VALUE,
	name, prop->info->name);
	return;
	}
	*ptr = hubport;
	}

	PropertyInfo qdev_prop_vlan = {
	.name = "vlan",
	.print = print_vlan,
	.get = get_vlan,
	.set = set_vlan,
	};

	int qdev_prop_set_drive(DeviceState dev, const char name,
	BlockDriverState *value)
	{
	Error *errp = NULL;
	const char *bdrv_name = value ? bdrv_get_device_name(value) : "";
	object_property_set_str(OBJECT(dev), bdrv_name,
	name, &errp);
	if (errp) {
	qerror_report_err(errp);
	error_free(errp);
	return -1;
	}
	return 0;
	}

	void qdev_prop_set_drive_nofail(DeviceState dev, const char name,
	BlockDriverState *value)
	{
	if (qdev_prop_set_drive(dev, name, value) < 0) {
	exit(1);
	}
	}
	void qdev_prop_set_chr(DeviceState dev, const char name,
	CharDriverState *value)
	{
	Error *errp = NULL;
	assert(!value \|\| value->label);
	object_property_set_str(OBJECT(dev),
	value ? value->label : "", name, &errp);
	assert_no_error(errp);
	}

	void qdev_prop_set_netdev(DeviceState dev, const char name,
	NetClientState *value)
	{
	Error *errp = NULL;
	assert(!value \|\| value->name);
	object_property_set_str(OBJECT(dev),
	value ? value->name : "", name, &errp);
	assert_no_error(errp);
	}

	void qdev_set_nic_properties(DeviceState dev, NICInfo nd)
	{
	qdev_prop_set_macaddr(dev, "mac", nd->macaddr.a);
	if (nd->netdev) {
	qdev_prop_set_netdev(dev, "netdev", nd->netdev);
	}
	if (nd->nvectors != DEV_NVECTORS_UNSPECIFIED &&
	object_property_find(OBJECT(dev), "vectors", NULL)) {
	qdev_prop_set_uint32(dev, "vectors", nd->nvectors);
	}
	nd->instantiated = 1;
	}

	static int qdev_add_one_global(QemuOpts opts, void opaque)
	{
	GlobalProperty *g;

	g = g_malloc0(sizeof(*g));
	g->driver = qemu_opt_get(opts, "driver");
	g->property = qemu_opt_get(opts, "property");
	g->value = qemu_opt_get(opts, "value");
	qdev_prop_register_global(g);
	return 0;
	}

	void qemu_add_globals(void)
	{
	qemu_opts_foreach(qemu_find_opts("global"), qdev_add_one_global, NULL, 0);
	}