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Commit 411cb4a0 authored by Jag Raman's avatar Jag Raman Committed by David S. Miller
Browse files

sparc64: expand MDESC interface 



Add the following two APIs to Machine Description (MDESC)
- mdesc_get_node: Searches for a node in the Machine
  Description tree based on given information about
  that node.
- mdesc_get_node_info: Retrieves information about a
  given node.

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 01b7a471

arch/sparc/include/asm/mdesc.h

+17 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ struct mdesc_handle *mdesc_grab(void); 
void mdesc_release(struct mdesc_handle *);



#define MDESC_NODE_NULL		(~(u64)0)

#define MDESC_MAX_STR_LEN	256



u64 mdesc_node_by_name(struct mdesc_handle *handle,

		       u64 from_node, const char *name);
@@ -71,6 +72,22 @@ struct mdesc_notifier_client { 


void mdesc_register_notifier(struct mdesc_notifier_client *client);



union md_node_info {

	struct vdev_port {

		u64 id;				/* id */

		u64 parent_cfg_hdl;		/* parent config handle */

		const char *name;		/* name (property) */

	} vdev_port;

	struct ds_port {

		u64 id;				/* id */

	} ds_port;

};



u64 mdesc_get_node(struct mdesc_handle *hp, const char *node_name,

		   union md_node_info *node_info);

int mdesc_get_node_info(struct mdesc_handle *hp, u64 node,

			const char *node_name, union md_node_info *node_info);



void mdesc_fill_in_cpu_data(cpumask_t *mask);

void mdesc_populate_present_mask(cpumask_t *mask);

void mdesc_get_page_sizes(cpumask_t *mask, unsigned long *pgsz_mask);

arch/sparc/kernel/mdesc.c

+216 −0
Original line number Diff line number Diff line
@@ -75,6 +75,74 @@ struct mdesc_handle { 
	struct mdesc_hdr	mdesc;

};



typedef int (*mdesc_node_info_get_f)(struct mdesc_handle *, u64,

				     union md_node_info *);

typedef void (*mdesc_node_info_rel_f)(union md_node_info *);

typedef bool (*mdesc_node_match_f)(union md_node_info *, union md_node_info *);



struct md_node_ops {

	char			*name;

	mdesc_node_info_get_f	get_info;

	mdesc_node_info_rel_f	rel_info;

	mdesc_node_match_f	node_match;

};



static int get_vdev_port_node_info(struct mdesc_handle *md, u64 node,

				   union md_node_info *node_info);

static void rel_vdev_port_node_info(union md_node_info *node_info);

static bool vdev_port_node_match(union md_node_info *a_node_info,

				 union md_node_info *b_node_info);



static int get_ds_port_node_info(struct mdesc_handle *md, u64 node,

				 union md_node_info *node_info);

static void rel_ds_port_node_info(union md_node_info *node_info);

static bool ds_port_node_match(union md_node_info *a_node_info,

			       union md_node_info *b_node_info);



/* supported node types which can be registered */

static struct md_node_ops md_node_ops_table[] = {

	{"virtual-device-port", get_vdev_port_node_info,

	 rel_vdev_port_node_info, vdev_port_node_match},

	{"domain-services-port", get_ds_port_node_info,

	 rel_ds_port_node_info, ds_port_node_match},

	{NULL, NULL, NULL, NULL}

};



static void mdesc_get_node_ops(const char *node_name,

			       mdesc_node_info_get_f *get_info_f,

			       mdesc_node_info_rel_f *rel_info_f,

			       mdesc_node_match_f *match_f)

{

	int i;



	if (get_info_f)

		*get_info_f = NULL;



	if (rel_info_f)

		*rel_info_f = NULL;



	if (match_f)

		*match_f = NULL;



	if (!node_name)

		return;



	for (i = 0; md_node_ops_table[i].name != NULL; i++) {

		if (strcmp(md_node_ops_table[i].name, node_name) == 0) {

			if (get_info_f)

				*get_info_f = md_node_ops_table[i].get_info;



			if (rel_info_f)

				*rel_info_f = md_node_ops_table[i].rel_info;



			if (match_f)

				*match_f = md_node_ops_table[i].node_match;



			break;

		}

	}

}



static void mdesc_handle_init(struct mdesc_handle *hp,

			      unsigned int handle_size,

			      void *base)
@@ -249,6 +317,86 @@ static const u64 *parent_cfg_handle(struct mdesc_handle *hp, u64 node) 
	return id;

}



static int get_vdev_port_node_info(struct mdesc_handle *md, u64 node,

				   union md_node_info *node_info)

{

	const u64 *parent_cfg_hdlp;

	const char *name;

	const u64 *idp;



	/*

	 * Virtual device nodes are distinguished by:

	 * 1. "id" property

	 * 2. "name" property

	 * 3. parent node "cfg-handle" property

	 */

	idp = mdesc_get_property(md, node, "id", NULL);

	name = mdesc_get_property(md, node, "name", NULL);

	parent_cfg_hdlp = parent_cfg_handle(md, node);



	if (!idp || !name || !parent_cfg_hdlp)

		return -1;



	node_info->vdev_port.id = *idp;

	node_info->vdev_port.name = kstrdup_const(name, GFP_KERNEL);

	node_info->vdev_port.parent_cfg_hdl = *parent_cfg_hdlp;



	return 0;

}



static void rel_vdev_port_node_info(union md_node_info *node_info)

{

	if (node_info && node_info->vdev_port.name) {

		kfree_const(node_info->vdev_port.name);

		node_info->vdev_port.name = NULL;

	}

}



static bool vdev_port_node_match(union md_node_info *a_node_info,

				 union md_node_info *b_node_info)

{

	if (a_node_info->vdev_port.id != b_node_info->vdev_port.id)

		return false;



	if (a_node_info->vdev_port.parent_cfg_hdl !=

	    b_node_info->vdev_port.parent_cfg_hdl)

		return false;



	if (strncmp(a_node_info->vdev_port.name,

		    b_node_info->vdev_port.name, MDESC_MAX_STR_LEN) != 0)

		return false;



	return true;

}



static int get_ds_port_node_info(struct mdesc_handle *md, u64 node,

				 union md_node_info *node_info)

{

	const u64 *idp;



	/* DS port nodes use the "id" property to distinguish them */

	idp = mdesc_get_property(md, node, "id", NULL);

	if (!idp)

		return -1;



	node_info->ds_port.id = *idp;



	return 0;

}



static void rel_ds_port_node_info(union md_node_info *node_info)

{

}



static bool ds_port_node_match(union md_node_info *a_node_info,

			       union md_node_info *b_node_info)

{

	if (a_node_info->ds_port.id != b_node_info->ds_port.id)

		return false;



	return true;

}



/* Run 'func' on nodes which are in A but not in B.  */

static void invoke_on_missing(const char *name,

			      struct mdesc_handle *a,
@@ -367,6 +515,74 @@ void mdesc_update(void) 
	mutex_unlock(&mdesc_mutex);

}



u64 mdesc_get_node(struct mdesc_handle *hp, const char *node_name,

		   union md_node_info *node_info)

{

	mdesc_node_info_get_f get_info_func;

	mdesc_node_info_rel_f rel_info_func;

	mdesc_node_match_f node_match_func;

	union md_node_info hp_node_info;

	u64 hp_node;

	int rv;



	if (hp == NULL || node_name == NULL || node_info == NULL)

		return MDESC_NODE_NULL;



	/* Find the ops for the given node name */

	mdesc_get_node_ops(node_name, &get_info_func, &rel_info_func,

			   &node_match_func);



	/* If we didn't find ops for the given node name, it is not supported */

	if (!get_info_func || !rel_info_func || !node_match_func) {

		pr_err("MD: %s node is not supported\n", node_name);

		return -EINVAL;

	}



	mdesc_for_each_node_by_name(hp, hp_node, node_name) {

		rv = get_info_func(hp, hp_node, &hp_node_info);

		if (rv != 0)

			continue;



		if (node_match_func(node_info, &hp_node_info))

			break;



		rel_info_func(&hp_node_info);

	}



	rel_info_func(&hp_node_info);



	return hp_node;

}



int mdesc_get_node_info(struct mdesc_handle *hp, u64 node,

			const char *node_name, union md_node_info *node_info)

{

	mdesc_node_info_get_f get_info_func;

	int rv;



	if (hp == NULL || node == MDESC_NODE_NULL ||

	    node_name == NULL || node_info == NULL)

		return -EINVAL;



	/* Find the get_info op for the given node name */

	mdesc_get_node_ops(node_name, &get_info_func, NULL, NULL);



	/* If we didn't find a get_info_func, the node name is not supported */

	if (get_info_func == NULL) {

		pr_err("MD: %s node is not supported\n", node_name);

		return -EINVAL;

	}



	rv = get_info_func(hp, node, node_info);

	if (rv != 0) {

		pr_err("MD: Cannot find 1 or more required match properties for %s node.\n",

		       node_name);

		return -1;

	}



	return 0;

}



static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc)

{

	return (struct mdesc_elem *) (mdesc + 1);