/**
* acquire_cpu
*
* Acquire a new cpu for this partition from the hypervisor.
* If drc_index is zero, look up an available index to use.
*
* @param drc_index
* @returns pointer to cpu_info on success, NULL otherwise
*/
static int
acquire_cpu(struct dr_node *cpu, struct dr_info *dr_info)
{
struct of_node *of_nodes;
int rc;
rc = acquire_drc(cpu->drc_index);
if (rc) {
say(DEBUG, "Could not acquire drc resources for %s\n",
cpu->name);
return rc;
}
of_nodes = configure_connector(cpu->drc_index);
if (of_nodes == NULL) {
say(ERROR, "Call to configure_connector failed for %s\n",
cpu->name);
release_drc(cpu->drc_index, CPU_DEV);
return -1;
}
rc = add_device_tree_nodes(CPU_OFDT_BASE, of_nodes);
free_of_node(of_nodes);
if (rc) {
say(ERROR, "Failure to add device tree nodes for %s\n",
cpu->name);
release_drc(cpu->drc_index, CPU_DEV);
return rc;
}
update_cpu_node(cpu, NULL, dr_info);
refresh_cache_info(dr_info);
return 0;
}
/**
* add_lmbs
*
* Attempt to acquire and online the given number of LMBs.
* This function calls itself recursively to simplify recovery
* actions in case of an error. This is intended only for the case
* where the user does not specify a drc-name.
*
* @param nr_lmbs number of lmbs to add
* @param lmb_list list of lmbs on the partition
* @returns 0 on success, !0 otherwise
*/
static int add_lmbs(struct lmb_list_head *lmb_list)
{
int rc = 0;
struct dr_node *lmb_head = lmb_list->lmbs;
struct dr_node *lmb;
lmb_list->lmbs_modified = 0;
while (lmb_list->lmbs_modified < usr_drc_count) {
if (drmgr_timed_out())
break;
lmb = get_available_lmb(lmb_head);
if (lmb == NULL)
return -1;
/* Iterate only over the remaining LMBs */
lmb_head = lmb->next;
rc = acquire_drc(lmb->drc_index);
if (rc) {
report_unknown_error(__FILE__, __LINE__);
lmb->unusable = 1;
continue;
}
rc = add_device_tree_lmb(lmb, lmb_list);
if (rc) {
report_unknown_error(__FILE__, __LINE__);
release_drc(lmb->drc_index, MEM_DEV);
lmb->unusable = 1;
continue;
}
rc = set_lmb_state(lmb, ONLINE);
if (rc) {
report_unknown_error(__FILE__, __LINE__);
remove_device_tree_lmb(lmb, lmb_list);
release_drc(lmb->drc_index, MEM_DEV);
lmb->unusable = 1;
continue;
}
lmb_list->lmbs_modified++;
}
return rc;
}
/**
* acquire_phb
*
*/
static int acquire_phb(char *drc_name, struct dr_node **phb)
{
struct dr_connector drc;
struct of_node *of_nodes;
char path[DR_PATH_MAX];
int rc;
rc = get_drc_by_name(drc_name, &drc, path, OFDT_BASE);
if (rc) {
say(ERROR, "Could not find drc index for %s, unable to add the"
"PHB.\n", drc_name);
return rc;
}
rc = acquire_drc(drc.index);
if (rc)
return rc;
of_nodes = configure_connector(drc.index);
if (of_nodes == NULL) {
release_drc(drc.index, PHB_DEV);
return -1;
}
rc = add_device_tree_nodes(path, of_nodes);
free_of_node(of_nodes);
if (rc) {
say(ERROR, "add_device_tree_nodes failed at %s\n", path);
release_drc(drc.index, PHB_DEV);
return -1;
}
/* Now that the node has been added to the device-tree, retrieve it.
* This also acts as a sanity check that everything up to this
* point has succeeded.
*/
*phb = get_node_by_name(drc_name, PHB_NODES);
if (*phb == NULL) {
say(ERROR, "Could not get find \"%s\"\n", drc_name);
/* or should we call release_drc? but need device type */
release_drc(drc.index, PHB_DEV);
return -1;
}
return 0;
}
/**
* release_cpu
*
* Release a cpu back to the hypervisor, using the cpu's drc-index.
* The cpu must have already been offlined. We remove the cpu from the
* device tree only when the isolate and set_indicator have succeeded.
* The caller must not use the value given for the cpu parameter after
* this function has returned.
*
* @param cpu
* @returns 0 on success, !0 otherwise
*/
int
release_cpu(struct dr_node *cpu, struct dr_info *dr_info)
{
int release_file;
int rc;
release_file = open(CPU_RELEASE_FILE, O_WRONLY);
if (release_file > 0) {
/* DLPAR can be done in kernel */
char *path = cpu->ofdt_path + strlen(OFDT_BASE);
int write_len = strlen(path);
say(DEBUG, "Releasing cpu \"%s\"\n", path);
rc = write(release_file, path, write_len);
if (rc != write_len)
say(ERROR, "Release failed! rc = %d\n", rc);
else
/* set rc to success */
rc = 0;
close(release_file);
} else {
/* Must do DLPAR from user-space */
rc = offline_cpu(cpu);
if (rc) {
say(ERROR, "Could not offline cpu %s\n", cpu->drc_name);
return rc;
}
rc = release_drc(cpu->drc_index, CPU_DEV);
if (rc) {
say(ERROR, "Could not release drc resources for %s\n",
cpu->name);
return rc;
}
rc = remove_device_tree_nodes(cpu->ofdt_path);
if (rc) {
struct of_node *of_nodes;
say(ERROR, "Could not remove device tree nodes %s\n",
cpu->name);
of_nodes = configure_connector(cpu->drc_index);
if (of_nodes == NULL) {
say(ERROR, "Call to configure_connector failed "
"for %s. The device tree\nmay contain "
"invalid data for this cpu and a "
"re-activation of the partition is "
"needed to correct it.\n", cpu->name);
} else {
rc = add_device_tree_nodes(CPU_OFDT_BASE,
of_nodes);
free_of_node(of_nodes);
}
acquire_drc(cpu->drc_index);
return rc;
}
release_caches(cpu, dr_info);
}
return rc;
}
