mirror of https://gitee.com/openkylin/linux.git
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: Jagannathan Raman <jag.raman@oracle.com> Reviewed-by: Liam Merwick <liam.merwick@oracle.com> Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jag Raman
David S. Miller
parent
01b7a47138
commit
411cb4a0b3
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@ -16,6 +16,7 @@ struct mdesc_handle *mdesc_grab(void);
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void mdesc_release(struct mdesc_handle *);
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#define MDESC_NODE_NULL (~(u64)0)
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#define MDESC_MAX_STR_LEN 256
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u64 mdesc_node_by_name(struct mdesc_handle *handle,
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u64 from_node, const char *name);
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@ -71,6 +72,22 @@ struct mdesc_notifier_client {
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void mdesc_register_notifier(struct mdesc_notifier_client *client);
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union md_node_info {
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struct vdev_port {
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u64 id; /* id */
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u64 parent_cfg_hdl; /* parent config handle */
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const char *name; /* name (property) */
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} vdev_port;
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struct ds_port {
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u64 id; /* id */
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} ds_port;
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};
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u64 mdesc_get_node(struct mdesc_handle *hp, const char *node_name,
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union md_node_info *node_info);
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int mdesc_get_node_info(struct mdesc_handle *hp, u64 node,
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const char *node_name, union md_node_info *node_info);
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void mdesc_fill_in_cpu_data(cpumask_t *mask);
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void mdesc_populate_present_mask(cpumask_t *mask);
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void mdesc_get_page_sizes(cpumask_t *mask, unsigned long *pgsz_mask);
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@ -75,6 +75,74 @@ struct mdesc_handle {
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struct mdesc_hdr mdesc;
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};
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typedef int (*mdesc_node_info_get_f)(struct mdesc_handle *, u64,
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union md_node_info *);
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typedef void (*mdesc_node_info_rel_f)(union md_node_info *);
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typedef bool (*mdesc_node_match_f)(union md_node_info *, union md_node_info *);
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struct md_node_ops {
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char *name;
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mdesc_node_info_get_f get_info;
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mdesc_node_info_rel_f rel_info;
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mdesc_node_match_f node_match;
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};
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static int get_vdev_port_node_info(struct mdesc_handle *md, u64 node,
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union md_node_info *node_info);
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static void rel_vdev_port_node_info(union md_node_info *node_info);
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static bool vdev_port_node_match(union md_node_info *a_node_info,
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union md_node_info *b_node_info);
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static int get_ds_port_node_info(struct mdesc_handle *md, u64 node,
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union md_node_info *node_info);
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static void rel_ds_port_node_info(union md_node_info *node_info);
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static bool ds_port_node_match(union md_node_info *a_node_info,
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union md_node_info *b_node_info);
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/* supported node types which can be registered */
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static struct md_node_ops md_node_ops_table[] = {
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{"virtual-device-port", get_vdev_port_node_info,
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rel_vdev_port_node_info, vdev_port_node_match},
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{"domain-services-port", get_ds_port_node_info,
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rel_ds_port_node_info, ds_port_node_match},
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{NULL, NULL, NULL, NULL}
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};
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static void mdesc_get_node_ops(const char *node_name,
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mdesc_node_info_get_f *get_info_f,
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mdesc_node_info_rel_f *rel_info_f,
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mdesc_node_match_f *match_f)
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{
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int i;
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if (get_info_f)
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*get_info_f = NULL;
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if (rel_info_f)
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*rel_info_f = NULL;
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if (match_f)
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*match_f = NULL;
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if (!node_name)
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return;
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for (i = 0; md_node_ops_table[i].name != NULL; i++) {
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if (strcmp(md_node_ops_table[i].name, node_name) == 0) {
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if (get_info_f)
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*get_info_f = md_node_ops_table[i].get_info;
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if (rel_info_f)
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*rel_info_f = md_node_ops_table[i].rel_info;
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if (match_f)
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*match_f = md_node_ops_table[i].node_match;
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break;
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}
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}
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}
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static void mdesc_handle_init(struct mdesc_handle *hp,
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unsigned int handle_size,
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void *base)
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@ -249,6 +317,86 @@ static const u64 *parent_cfg_handle(struct mdesc_handle *hp, u64 node)
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return id;
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}
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static int get_vdev_port_node_info(struct mdesc_handle *md, u64 node,
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union md_node_info *node_info)
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{
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const u64 *parent_cfg_hdlp;
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const char *name;
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const u64 *idp;
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/*
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* Virtual device nodes are distinguished by:
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* 1. "id" property
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* 2. "name" property
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* 3. parent node "cfg-handle" property
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*/
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idp = mdesc_get_property(md, node, "id", NULL);
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name = mdesc_get_property(md, node, "name", NULL);
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parent_cfg_hdlp = parent_cfg_handle(md, node);
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if (!idp || !name || !parent_cfg_hdlp)
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return -1;
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node_info->vdev_port.id = *idp;
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node_info->vdev_port.name = kstrdup_const(name, GFP_KERNEL);
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node_info->vdev_port.parent_cfg_hdl = *parent_cfg_hdlp;
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return 0;
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}
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static void rel_vdev_port_node_info(union md_node_info *node_info)
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{
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if (node_info && node_info->vdev_port.name) {
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kfree_const(node_info->vdev_port.name);
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node_info->vdev_port.name = NULL;
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}
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}
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static bool vdev_port_node_match(union md_node_info *a_node_info,
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union md_node_info *b_node_info)
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{
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if (a_node_info->vdev_port.id != b_node_info->vdev_port.id)
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return false;
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if (a_node_info->vdev_port.parent_cfg_hdl !=
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b_node_info->vdev_port.parent_cfg_hdl)
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return false;
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if (strncmp(a_node_info->vdev_port.name,
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b_node_info->vdev_port.name, MDESC_MAX_STR_LEN) != 0)
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return false;
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return true;
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}
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static int get_ds_port_node_info(struct mdesc_handle *md, u64 node,
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union md_node_info *node_info)
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{
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const u64 *idp;
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/* DS port nodes use the "id" property to distinguish them */
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idp = mdesc_get_property(md, node, "id", NULL);
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if (!idp)
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return -1;
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node_info->ds_port.id = *idp;
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return 0;
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}
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static void rel_ds_port_node_info(union md_node_info *node_info)
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{
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}
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static bool ds_port_node_match(union md_node_info *a_node_info,
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union md_node_info *b_node_info)
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{
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if (a_node_info->ds_port.id != b_node_info->ds_port.id)
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return false;
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return true;
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}
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/* Run 'func' on nodes which are in A but not in B. */
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static void invoke_on_missing(const char *name,
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struct mdesc_handle *a,
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@ -367,6 +515,74 @@ void mdesc_update(void)
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mutex_unlock(&mdesc_mutex);
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}
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u64 mdesc_get_node(struct mdesc_handle *hp, const char *node_name,
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union md_node_info *node_info)
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{
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mdesc_node_info_get_f get_info_func;
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mdesc_node_info_rel_f rel_info_func;
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mdesc_node_match_f node_match_func;
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union md_node_info hp_node_info;
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u64 hp_node;
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int rv;
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if (hp == NULL || node_name == NULL || node_info == NULL)
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return MDESC_NODE_NULL;
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/* Find the ops for the given node name */
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mdesc_get_node_ops(node_name, &get_info_func, &rel_info_func,
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&node_match_func);
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/* If we didn't find ops for the given node name, it is not supported */
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if (!get_info_func || !rel_info_func || !node_match_func) {
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pr_err("MD: %s node is not supported\n", node_name);
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return -EINVAL;
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}
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mdesc_for_each_node_by_name(hp, hp_node, node_name) {
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rv = get_info_func(hp, hp_node, &hp_node_info);
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if (rv != 0)
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continue;
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if (node_match_func(node_info, &hp_node_info))
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break;
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rel_info_func(&hp_node_info);
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}
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rel_info_func(&hp_node_info);
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return hp_node;
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}
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int mdesc_get_node_info(struct mdesc_handle *hp, u64 node,
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const char *node_name, union md_node_info *node_info)
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{
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mdesc_node_info_get_f get_info_func;
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int rv;
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if (hp == NULL || node == MDESC_NODE_NULL ||
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node_name == NULL || node_info == NULL)
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return -EINVAL;
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/* Find the get_info op for the given node name */
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mdesc_get_node_ops(node_name, &get_info_func, NULL, NULL);
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/* If we didn't find a get_info_func, the node name is not supported */
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if (get_info_func == NULL) {
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pr_err("MD: %s node is not supported\n", node_name);
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return -EINVAL;
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}
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rv = get_info_func(hp, node, node_info);
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if (rv != 0) {
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pr_err("MD: Cannot find 1 or more required match properties for %s node.\n",
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node_name);
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return -1;
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}
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return 0;
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}
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static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc)
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{
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return (struct mdesc_elem *) (mdesc + 1);
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