Commit f4d29ca7 authored by Jag Raman's avatar Jag Raman Committed by David S. Miller
Browse files

sparc64: Enhance search for VIO device in MDESC 



Enhances search for VIO device in MDESC by leveraging already existing
MDESC APIs. Enhances changes in earlier patch,
"sparc: Machine description indices can vary", by using existing MD
search functions. It also specifies a match function, thereby
enabling device_find_child() to use it for the purpose of matching
device nodes in MDESC.

An API to find VDEV node in MDESC based on its md_node_info is also
added. It is planned to be used by VIO device clients in the future.

Signed-off-by: default avatarJagannathan Raman <jag.raman@oracle.com>
Reviewed-by: default avatarLiam Merwick <liam.merwick@oracle.com>
Reviewed-by: default avatarShannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent aa512d5e

arch/sparc/include/asm/vio.h

+4 −1
Original line number Diff line number Diff line
@@ -329,7 +329,6 @@ struct vio_dev { 
	int			compat_len;



	u64			dev_no;

	u64			id;



	unsigned long		channel_id;
@@ -341,6 +340,9 @@ struct vio_dev { 
	/* Handle to the root of "channel-devices" sub-tree in MDESC */

	u64			cdev_handle;



	/* MD specific data used to identify the vdev in MD */

	union md_node_info	md_node_info;



	struct device		dev;

};
@@ -497,5 +499,6 @@ int vio_driver_init(struct vio_driver_state *vio, struct vio_dev *vdev, 


void vio_port_up(struct vio_driver_state *vio);

int vio_set_intr(unsigned long dev_ino, int state);

u64 vio_vdev_node(struct mdesc_handle *hp, struct vio_dev *vdev);



#endif /* _SPARC64_VIO_H */

arch/sparc/kernel/mdesc.c

+2 −0
Original line number Diff line number Diff line
@@ -574,6 +574,7 @@ u64 mdesc_get_node(struct mdesc_handle *hp, const char *node_name, 


	return hp_node;

}

EXPORT_SYMBOL(mdesc_get_node);



int mdesc_get_node_info(struct mdesc_handle *hp, u64 node,

			const char *node_name, union md_node_info *node_info)
@@ -603,6 +604,7 @@ int mdesc_get_node_info(struct mdesc_handle *hp, u64 node, 


	return 0;

}

EXPORT_SYMBOL(mdesc_get_node_info);



static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc)

{

arch/sparc/kernel/vio.c

+58 −62
Original line number Diff line number Diff line
@@ -217,6 +217,32 @@ static const u64 *vio_cfg_handle(struct mdesc_handle *hp, u64 node) 
	return cfg_handle;

}



/**

 * vio_vdev_node() - Find VDEV node in MD

 * @hp:  Handle to the MD

 * @vdev:  Pointer to VDEV

 *

 * Find the node in the current MD which matches the given vio_dev. This

 * must be done dynamically since the node value can change if the MD

 * is updated.

 *

 * NOTE: the MD must be locked, using mdesc_grab(), when calling this routine

 *

 * Return: The VDEV node in MDESC

 */

u64 vio_vdev_node(struct mdesc_handle *hp, struct vio_dev *vdev)

{

	u64 node;



	if (vdev == NULL)

		return MDESC_NODE_NULL;



	node = mdesc_get_node(hp, (const char *)vdev->node_name,

			      &vdev->md_node_info);



	return node;

}



static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,

				  struct vio_dev *vdev)

{
@@ -316,16 +342,13 @@ static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp, 
	if (!id) {

		dev_set_name(&vdev->dev, "%s", type);

		vdev->dev_no = ~(u64)0;

		vdev->id = ~(u64)0;

	} else if (!cfg_handle) {

		dev_set_name(&vdev->dev, "%s-%llu", type, *id);

		vdev->dev_no = *id;

		vdev->id = ~(u64)0;

	} else {

		dev_set_name(&vdev->dev, "%s-%llu-%llu", type,

			     *cfg_handle, *id);

		vdev->dev_no = *cfg_handle;

		vdev->id = *id;

	}



	vdev->dev.parent = parent;
@@ -347,11 +370,24 @@ static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp, 
	}

	vdev->dp = dp;



	/* node_name is NULL for the parent/channel-devices node */

	if (node_name != NULL)

	/*

	 * node_name is NULL for the parent/channel-devices node and

	 * the parent doesn't require the MD node info.

	 */

	if (node_name != NULL) {

		(void) snprintf(vdev->node_name, VIO_MAX_NAME_LEN, "%s",

				node_name);



		err = mdesc_get_node_info(hp, mp, node_name,

					  &vdev->md_node_info);

		if (err) {

			pr_err("VIO: Could not get MD node info %s, err=%d\n",

			       dev_name(&vdev->dev), err);

			kfree(vdev);

			return NULL;

		}

	}



	pr_info("VIO: Adding device %s (tx_ino = %llx, rx_ino = %llx)\n",

		dev_name(&vdev->dev), vdev->tx_ino, vdev->rx_ino);
@@ -375,68 +411,36 @@ static void vio_add(struct mdesc_handle *hp, u64 node, 
	(void) vio_create_one(hp, node, node_name, &root_vdev->dev);

}



struct vio_md_node_query {

	const char *type;

	u64 dev_no;

	u64 id;

struct vio_remove_node_data {

	struct mdesc_handle *hp;

	u64 node;

};



static int vio_md_node_match(struct device *dev, void *arg)

{

	struct vio_md_node_query *query = (struct vio_md_node_query *) arg;

	struct vio_dev *vdev = to_vio_dev(dev);

	struct vio_remove_node_data *node_data;

	u64 node;



	if (vdev->dev_no != query->dev_no)

		return 0;

	if (vdev->id != query->id)

		return 0;

	if (strcmp(vdev->type, query->type))

		return 0;

	node_data = (struct vio_remove_node_data *)arg;



	node = vio_vdev_node(node_data->hp, vdev);



	if (node == node_data->node)

		return 1;

	else

		return 0;

}



static void vio_remove(struct mdesc_handle *hp, u64 node, const char *node_name)

{

	const char *type;

	const u64 *id, *cfg_handle;

	u64 a;

	struct vio_md_node_query query;

	struct vio_remove_node_data node_data;

	struct device *dev;



	type = mdesc_get_property(hp, node, "device-type", NULL);

	if (!type) {

		type = mdesc_get_property(hp, node, "name", NULL);

		if (!type)

			type = mdesc_node_name(hp, node);

	}



	query.type = type;



	id = mdesc_get_property(hp, node, "id", NULL);

	cfg_handle = NULL;

	mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {

		u64 target;



		target = mdesc_arc_target(hp, a);

		cfg_handle = mdesc_get_property(hp, target,

						"cfg-handle", NULL);

		if (cfg_handle)

			break;

	}



	if (!id) {

		query.dev_no = ~(u64)0;

		query.id = ~(u64)0;

	} else if (!cfg_handle) {

		query.dev_no = *id;

		query.id = ~(u64)0;

	} else {

		query.dev_no = *cfg_handle;

		query.id = *id;

	}

	node_data.hp = hp;

	node_data.node = node;



	dev = device_find_child(&root_vdev->dev, &query,

	dev = device_find_child(&root_vdev->dev, (void *)&node_data,

				vio_md_node_match);

	if (dev) {

		printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev));
@@ -444,15 +448,7 @@ static void vio_remove(struct mdesc_handle *hp, u64 node, const char *node_name) 
		device_unregister(dev);

		put_device(dev);

	} else {

		if (!id)

			printk(KERN_ERR "VIO: Removed unknown %s node.\n",

			       type);

		else if (!cfg_handle)

			printk(KERN_ERR "VIO: Removed unknown %s node %llu.\n",

			       type, *id);

		else

			printk(KERN_ERR "VIO: Removed unknown %s node %llu-%llu.\n",

			       type, *cfg_handle, *id);

		pr_err("VIO: %s node not found in MDESC\n", node_name);

	}

}

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