hw/core/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 "qemu/osdep.h"
 #include "net/net.h"
 #include "hw/qdev.h"
 #include "qapi/error.h"
 #include "qapi/qmp/qerror.h"
 #include "sysemu/block-backend.h"
 #include "sysemu/blockdev.h"
 #include "hw/block/block.h"
 #include "net/hub.h"
 #include "qapi/visitor.h"
 #include "sysemu/char.h"
 #include "sysemu/iothread.h"

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

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

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

     if (dev->realized) {
         qdev_prop_set_after_realize(dev, name, errp);
         return;
     }

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

 /* --- drive --- */

 static void parse_drive(DeviceState *dev, const char *str, void **ptr,
                         const char *propname, Error **errp)
 {
     BlockBackend *blk;

     blk = blk_by_name(str);
     if (!blk) {
         error_setg(errp, "Property '%s.%s' can't find value '%s'",
                    object_get_typename(OBJECT(dev)), propname, str);
         return;
     }
     if (blk_attach_dev(blk, dev) < 0) {
         DriveInfo *dinfo = blk_legacy_dinfo(blk);

         if (dinfo && dinfo->type != IF_NONE) {
             error_setg(errp, "Drive '%s' is already in use because "
                        "it has been automatically connected to another "
                        "device (did you need 'if=none' in the drive options?)",
                        str);
         } else {
             error_setg(errp, "Drive '%s' is already in use by another device",
                        str);
         }
         return;
     }
     *ptr = blk;
 }

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

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

 static char *print_drive(void *ptr)
 {
     return g_strdup(blk_name(ptr));
 }

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

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

 PropertyInfo qdev_prop_drive = {
     .name  = "str",
     .description = "ID of a drive to use as a backend",
     .get   = get_drive,
     .set   = set_drive,
     .release = release_drive,
 };

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

 static void parse_chr(DeviceState *dev, const char *str, void **ptr,
                       const char *propname, Error **errp)
 {
     CharDriverState *chr = qemu_chr_find(str);
     if (chr == NULL) {
         error_setg(errp, "Property '%s.%s' can't find value '%s'",
                    object_get_typename(OBJECT(dev)), propname, str);
         return;
     }
     if (qemu_chr_fe_claim(chr) != 0) {
         error_setg(errp, "Property '%s.%s' can't take value '%s', it's in use",
                   object_get_typename(OBJECT(dev)), propname, str);
         return;
     }
     *ptr = chr;
 }

 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);
     CharDriverState *chr = *ptr;

     if (chr) {
         qemu_chr_add_handlers(chr, NULL, NULL, NULL, NULL);
         qemu_chr_fe_release(chr);
     }
 }


 static char *print_chr(void *ptr)
 {
     CharDriverState *chr = ptr;
     const char *val = chr->label ? chr->label : "";

     return g_strdup(val);
 }

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

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

 PropertyInfo qdev_prop_chr = {
     .name  = "str",
     .description = "ID of a chardev to use as a backend",
     .get   = get_chr,
     .set   = set_chr,
     .release = release_chr,
 };

 /* --- netdev device --- */
 static void get_netdev(Object *obj, Visitor *v, const char *name,
                        void *opaque, Error **errp)
 {
     DeviceState *dev = DEVICE(obj);
     Property *prop = opaque;
     NICPeers *peers_ptr = qdev_get_prop_ptr(dev, prop);
     char *p = g_strdup(peers_ptr->ncs[0] ? peers_ptr->ncs[0]->name : "");

     visit_type_str(v, name, &p, errp);
     g_free(p);
 }

 static void set_netdev(Object *obj, Visitor *v, const char *name,
                        void *opaque, Error **errp)
 {
     DeviceState *dev = DEVICE(obj);
     Property *prop = opaque;
     NICPeers *peers_ptr = qdev_get_prop_ptr(dev, prop);
     NetClientState **ncs = peers_ptr->ncs;
     NetClientState *peers[MAX_QUEUE_NUM];
     Error *local_err = NULL;
     int queues, err = 0, i = 0;
     char *str;

     if (dev->realized) {
         qdev_prop_set_after_realize(dev, name, errp);
         return;
     }

     visit_type_str(v, name, &str, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
         return;
     }

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

     if (queues > MAX_QUEUE_NUM) {
         error_setg(errp, "queues of backend '%s'(%d) exceeds QEMU limitation(%d)",
                    str, queues, MAX_QUEUE_NUM);
         goto out;
     }

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

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

         if (ncs[i]) {
             err = -EINVAL;
             goto out;
         }

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

     peers_ptr->queues = queues;

 out:
     error_set_from_qdev_prop_error(errp, err, dev, prop, str);
     g_free(str);
 }

 PropertyInfo qdev_prop_netdev = {
     .name  = "str",
     .description = "ID of a netdev to use as a backend",
     .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, const char *name, void *opaque,
                      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, name, &id, errp);
 }

 static void set_vlan(Object *obj, Visitor *v, const char *name, void *opaque,
                      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) {
         qdev_prop_set_after_realize(dev, name, errp);
         return;
     }

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

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

 PropertyInfo qdev_prop_vlan = {
     .name  = "int32",
     .description = "Integer VLAN id to connect to",
     .print = print_vlan,
     .get   = get_vlan,
     .set   = set_vlan,
 };

 void qdev_prop_set_drive(DeviceState *dev, const char *name,
                          BlockBackend *value, Error **errp)
 {
     object_property_set_str(OBJECT(dev), value ? blk_name(value) : "",
                             name, errp);
 }

 void qdev_prop_set_chr(DeviceState *dev, const char *name,
                        CharDriverState *value)
 {
     assert(!value || value->label);
     object_property_set_str(OBJECT(dev),
                             value ? value->label : "", name, &error_abort);
 }

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

 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(void *opaque, QemuOpts *opts, Error **errp)
 {
     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");
     g->user_provided = true;
     qdev_prop_register_global(g);
     return 0;
 }

 void qemu_add_globals(void)
 {
     qemu_opts_foreach(qemu_find_opts("global"),
                       qdev_add_one_global, NULL, NULL);
 }
	/*
	* 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 "qemu/osdep.h"
	#include "net/net.h"
	#include "hw/qdev.h"
	#include "qapi/error.h"
	#include "qapi/qmp/qerror.h"
	#include "sysemu/block-backend.h"
	#include "sysemu/blockdev.h"
	#include "hw/block/block.h"
	#include "net/hub.h"
	#include "qapi/visitor.h"
	#include "sysemu/char.h"
	#include "sysemu/iothread.h"

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

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

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

	if (dev->realized) {
	qdev_prop_set_after_realize(dev, name, errp);
	return;
	}

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

	/* --- drive --- */

	static void parse_drive(DeviceState dev, const char str, void **ptr,
	const char propname, Error *errp)
	{
	BlockBackend *blk;

	blk = blk_by_name(str);
	if (!blk) {
	error_setg(errp, "Property '%s.%s' can't find value '%s'",
	object_get_typename(OBJECT(dev)), propname, str);
	return;
	}
	if (blk_attach_dev(blk, dev) < 0) {
	DriveInfo *dinfo = blk_legacy_dinfo(blk);

	if (dinfo && dinfo->type != IF_NONE) {
	error_setg(errp, "Drive '%s' is already in use because "
	"it has been automatically connected to another "
	"device (did you need 'if=none' in the drive options?)",
	str);
	} else {
	error_setg(errp, "Drive '%s' is already in use by another device",
	str);
	}
	return;
	}
	*ptr = blk;
	}

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

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

	static char print_drive(void ptr)
	{
	return g_strdup(blk_name(ptr));
	}

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

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

	PropertyInfo qdev_prop_drive = {
	.name = "str",
	.description = "ID of a drive to use as a backend",
	.get = get_drive,
	.set = set_drive,
	.release = release_drive,
	};

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

	static void parse_chr(DeviceState dev, const char str, void **ptr,
	const char propname, Error *errp)
	{
	CharDriverState *chr = qemu_chr_find(str);
	if (chr == NULL) {
	error_setg(errp, "Property '%s.%s' can't find value '%s'",
	object_get_typename(OBJECT(dev)), propname, str);
	return;
	}
	if (qemu_chr_fe_claim(chr) != 0) {
	error_setg(errp, "Property '%s.%s' can't take value '%s', it's in use",
	object_get_typename(OBJECT(dev)), propname, str);
	return;
	}
	*ptr = chr;
	}

	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);
	CharDriverState chr = ptr;

	if (chr) {
	qemu_chr_add_handlers(chr, NULL, NULL, NULL, NULL);
	qemu_chr_fe_release(chr);
	}
	}


	static char print_chr(void ptr)
	{
	CharDriverState *chr = ptr;
	const char *val = chr->label ? chr->label : "";

	return g_strdup(val);
	}

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

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

	PropertyInfo qdev_prop_chr = {
	.name = "str",
	.description = "ID of a chardev to use as a backend",
	.get = get_chr,
	.set = set_chr,
	.release = release_chr,
	};

	/* --- netdev device --- */
	static void get_netdev(Object obj, Visitor v, const char *name,
	void opaque, Error *errp)
	{
	DeviceState *dev = DEVICE(obj);
	Property *prop = opaque;
	NICPeers *peers_ptr = qdev_get_prop_ptr(dev, prop);
	char *p = g_strdup(peers_ptr->ncs[0] ? peers_ptr->ncs[0]->name : "");

	visit_type_str(v, name, &p, errp);
	g_free(p);
	}

	static void set_netdev(Object obj, Visitor v, const char *name,
	void opaque, Error *errp)
	{
	DeviceState *dev = DEVICE(obj);
	Property *prop = opaque;
	NICPeers *peers_ptr = qdev_get_prop_ptr(dev, prop);
	NetClientState **ncs = peers_ptr->ncs;
	NetClientState *peers[MAX_QUEUE_NUM];
	Error *local_err = NULL;
	int queues, err = 0, i = 0;
	char *str;

	if (dev->realized) {
	qdev_prop_set_after_realize(dev, name, errp);
	return;
	}

	visit_type_str(v, name, &str, &local_err);
	if (local_err) {
	error_propagate(errp, local_err);
	return;
	}

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

	if (queues > MAX_QUEUE_NUM) {
	error_setg(errp, "queues of backend '%s'(%d) exceeds QEMU limitation(%d)",
	str, queues, MAX_QUEUE_NUM);
	goto out;
	}

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

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

	if (ncs[i]) {
	err = -EINVAL;
	goto out;
	}

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

	peers_ptr->queues = queues;

	out:
	error_set_from_qdev_prop_error(errp, err, dev, prop, str);
	g_free(str);
	}

	PropertyInfo qdev_prop_netdev = {
	.name = "str",
	.description = "ID of a netdev to use as a backend",
	.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, const char name, void opaque,
	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, name, &id, errp);
	}

	static void set_vlan(Object obj, Visitor v, const char name, void opaque,
	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) {
	qdev_prop_set_after_realize(dev, name, errp);
	return;
	}

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

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

	PropertyInfo qdev_prop_vlan = {
	.name = "int32",
	.description = "Integer VLAN id to connect to",
	.print = print_vlan,
	.get = get_vlan,
	.set = set_vlan,
	};

	void qdev_prop_set_drive(DeviceState dev, const char name,
	BlockBackend value, Error *errp)
	{
	object_property_set_str(OBJECT(dev), value ? blk_name(value) : "",
	name, errp);
	}

	void qdev_prop_set_chr(DeviceState dev, const char name,
	CharDriverState *value)
	{
	assert(!value \|\| value->label);
	object_property_set_str(OBJECT(dev),
	value ? value->label : "", name, &error_abort);
	}

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

	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(void opaque, QemuOpts opts, Error **errp)
	{
	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");
	g->user_provided = true;
	qdev_prop_register_global(g);
	return 0;
	}

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