588 lines
12 KiB
C
588 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Support for dynamic reconfiguration for PCI, Memory, and CPU
|
|
* Hotplug and Dynamic Logical Partitioning on RPA platforms.
|
|
*
|
|
* Copyright (C) 2009 Nathan Fontenot
|
|
* Copyright (C) 2009 IBM Corporation
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "dlpar: " fmt
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/of.h>
|
|
|
|
#include "of_helpers.h"
|
|
#include "pseries.h"
|
|
|
|
#include <asm/prom.h>
|
|
#include <asm/machdep.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/rtas.h>
|
|
|
|
static struct workqueue_struct *pseries_hp_wq;
|
|
|
|
struct pseries_hp_work {
|
|
struct work_struct work;
|
|
struct pseries_hp_errorlog *errlog;
|
|
};
|
|
|
|
struct cc_workarea {
|
|
__be32 drc_index;
|
|
__be32 zero;
|
|
__be32 name_offset;
|
|
__be32 prop_length;
|
|
__be32 prop_offset;
|
|
};
|
|
|
|
void dlpar_free_cc_property(struct property *prop)
|
|
{
|
|
kfree(prop->name);
|
|
kfree(prop->value);
|
|
kfree(prop);
|
|
}
|
|
|
|
static struct property *dlpar_parse_cc_property(struct cc_workarea *ccwa)
|
|
{
|
|
struct property *prop;
|
|
char *name;
|
|
char *value;
|
|
|
|
prop = kzalloc(sizeof(*prop), GFP_KERNEL);
|
|
if (!prop)
|
|
return NULL;
|
|
|
|
name = (char *)ccwa + be32_to_cpu(ccwa->name_offset);
|
|
prop->name = kstrdup(name, GFP_KERNEL);
|
|
if (!prop->name) {
|
|
dlpar_free_cc_property(prop);
|
|
return NULL;
|
|
}
|
|
|
|
prop->length = be32_to_cpu(ccwa->prop_length);
|
|
value = (char *)ccwa + be32_to_cpu(ccwa->prop_offset);
|
|
prop->value = kmemdup(value, prop->length, GFP_KERNEL);
|
|
if (!prop->value) {
|
|
dlpar_free_cc_property(prop);
|
|
return NULL;
|
|
}
|
|
|
|
return prop;
|
|
}
|
|
|
|
static struct device_node *dlpar_parse_cc_node(struct cc_workarea *ccwa)
|
|
{
|
|
struct device_node *dn;
|
|
const char *name;
|
|
|
|
dn = kzalloc(sizeof(*dn), GFP_KERNEL);
|
|
if (!dn)
|
|
return NULL;
|
|
|
|
name = (const char *)ccwa + be32_to_cpu(ccwa->name_offset);
|
|
dn->full_name = kstrdup(name, GFP_KERNEL);
|
|
if (!dn->full_name) {
|
|
kfree(dn);
|
|
return NULL;
|
|
}
|
|
|
|
of_node_set_flag(dn, OF_DYNAMIC);
|
|
of_node_init(dn);
|
|
|
|
return dn;
|
|
}
|
|
|
|
static void dlpar_free_one_cc_node(struct device_node *dn)
|
|
{
|
|
struct property *prop;
|
|
|
|
while (dn->properties) {
|
|
prop = dn->properties;
|
|
dn->properties = prop->next;
|
|
dlpar_free_cc_property(prop);
|
|
}
|
|
|
|
kfree(dn->full_name);
|
|
kfree(dn);
|
|
}
|
|
|
|
void dlpar_free_cc_nodes(struct device_node *dn)
|
|
{
|
|
if (dn->child)
|
|
dlpar_free_cc_nodes(dn->child);
|
|
|
|
if (dn->sibling)
|
|
dlpar_free_cc_nodes(dn->sibling);
|
|
|
|
dlpar_free_one_cc_node(dn);
|
|
}
|
|
|
|
#define COMPLETE 0
|
|
#define NEXT_SIBLING 1
|
|
#define NEXT_CHILD 2
|
|
#define NEXT_PROPERTY 3
|
|
#define PREV_PARENT 4
|
|
#define MORE_MEMORY 5
|
|
#define CALL_AGAIN -2
|
|
#define ERR_CFG_USE -9003
|
|
|
|
struct device_node *dlpar_configure_connector(__be32 drc_index,
|
|
struct device_node *parent)
|
|
{
|
|
struct device_node *dn;
|
|
struct device_node *first_dn = NULL;
|
|
struct device_node *last_dn = NULL;
|
|
struct property *property;
|
|
struct property *last_property = NULL;
|
|
struct cc_workarea *ccwa;
|
|
char *data_buf;
|
|
int cc_token;
|
|
int rc = -1;
|
|
|
|
cc_token = rtas_token("ibm,configure-connector");
|
|
if (cc_token == RTAS_UNKNOWN_SERVICE)
|
|
return NULL;
|
|
|
|
data_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
|
|
if (!data_buf)
|
|
return NULL;
|
|
|
|
ccwa = (struct cc_workarea *)&data_buf[0];
|
|
ccwa->drc_index = drc_index;
|
|
ccwa->zero = 0;
|
|
|
|
do {
|
|
/* Since we release the rtas_data_buf lock between configure
|
|
* connector calls we want to re-populate the rtas_data_buffer
|
|
* with the contents of the previous call.
|
|
*/
|
|
spin_lock(&rtas_data_buf_lock);
|
|
|
|
memcpy(rtas_data_buf, data_buf, RTAS_DATA_BUF_SIZE);
|
|
rc = rtas_call(cc_token, 2, 1, NULL, rtas_data_buf, NULL);
|
|
memcpy(data_buf, rtas_data_buf, RTAS_DATA_BUF_SIZE);
|
|
|
|
spin_unlock(&rtas_data_buf_lock);
|
|
|
|
switch (rc) {
|
|
case COMPLETE:
|
|
break;
|
|
|
|
case NEXT_SIBLING:
|
|
dn = dlpar_parse_cc_node(ccwa);
|
|
if (!dn)
|
|
goto cc_error;
|
|
|
|
dn->parent = last_dn->parent;
|
|
last_dn->sibling = dn;
|
|
last_dn = dn;
|
|
break;
|
|
|
|
case NEXT_CHILD:
|
|
dn = dlpar_parse_cc_node(ccwa);
|
|
if (!dn)
|
|
goto cc_error;
|
|
|
|
if (!first_dn) {
|
|
dn->parent = parent;
|
|
first_dn = dn;
|
|
} else {
|
|
dn->parent = last_dn;
|
|
if (last_dn)
|
|
last_dn->child = dn;
|
|
}
|
|
|
|
last_dn = dn;
|
|
break;
|
|
|
|
case NEXT_PROPERTY:
|
|
property = dlpar_parse_cc_property(ccwa);
|
|
if (!property)
|
|
goto cc_error;
|
|
|
|
if (!last_dn->properties)
|
|
last_dn->properties = property;
|
|
else
|
|
last_property->next = property;
|
|
|
|
last_property = property;
|
|
break;
|
|
|
|
case PREV_PARENT:
|
|
last_dn = last_dn->parent;
|
|
break;
|
|
|
|
case CALL_AGAIN:
|
|
break;
|
|
|
|
case MORE_MEMORY:
|
|
case ERR_CFG_USE:
|
|
default:
|
|
printk(KERN_ERR "Unexpected Error (%d) "
|
|
"returned from configure-connector\n", rc);
|
|
goto cc_error;
|
|
}
|
|
} while (rc);
|
|
|
|
cc_error:
|
|
kfree(data_buf);
|
|
|
|
if (rc) {
|
|
if (first_dn)
|
|
dlpar_free_cc_nodes(first_dn);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
return first_dn;
|
|
}
|
|
|
|
int dlpar_attach_node(struct device_node *dn, struct device_node *parent)
|
|
{
|
|
int rc;
|
|
|
|
dn->parent = parent;
|
|
|
|
rc = of_attach_node(dn);
|
|
if (rc) {
|
|
printk(KERN_ERR "Failed to add device node %pOF\n", dn);
|
|
return rc;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int dlpar_detach_node(struct device_node *dn)
|
|
{
|
|
struct device_node *child;
|
|
int rc;
|
|
|
|
child = of_get_next_child(dn, NULL);
|
|
while (child) {
|
|
dlpar_detach_node(child);
|
|
child = of_get_next_child(dn, child);
|
|
}
|
|
|
|
rc = of_detach_node(dn);
|
|
if (rc)
|
|
return rc;
|
|
|
|
of_node_put(dn);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define DR_ENTITY_SENSE 9003
|
|
#define DR_ENTITY_PRESENT 1
|
|
#define DR_ENTITY_UNUSABLE 2
|
|
#define ALLOCATION_STATE 9003
|
|
#define ALLOC_UNUSABLE 0
|
|
#define ALLOC_USABLE 1
|
|
#define ISOLATION_STATE 9001
|
|
#define ISOLATE 0
|
|
#define UNISOLATE 1
|
|
|
|
int dlpar_acquire_drc(u32 drc_index)
|
|
{
|
|
int dr_status, rc;
|
|
|
|
rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status,
|
|
DR_ENTITY_SENSE, drc_index);
|
|
if (rc || dr_status != DR_ENTITY_UNUSABLE)
|
|
return -1;
|
|
|
|
rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_USABLE);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
|
|
if (rc) {
|
|
rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
|
|
return rc;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int dlpar_release_drc(u32 drc_index)
|
|
{
|
|
int dr_status, rc;
|
|
|
|
rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status,
|
|
DR_ENTITY_SENSE, drc_index);
|
|
if (rc || dr_status != DR_ENTITY_PRESENT)
|
|
return -1;
|
|
|
|
rc = rtas_set_indicator(ISOLATION_STATE, drc_index, ISOLATE);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
|
|
if (rc) {
|
|
rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
|
|
return rc;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int handle_dlpar_errorlog(struct pseries_hp_errorlog *hp_elog)
|
|
{
|
|
int rc;
|
|
|
|
/* pseries error logs are in BE format, convert to cpu type */
|
|
switch (hp_elog->id_type) {
|
|
case PSERIES_HP_ELOG_ID_DRC_COUNT:
|
|
hp_elog->_drc_u.drc_count =
|
|
be32_to_cpu(hp_elog->_drc_u.drc_count);
|
|
break;
|
|
case PSERIES_HP_ELOG_ID_DRC_INDEX:
|
|
hp_elog->_drc_u.drc_index =
|
|
be32_to_cpu(hp_elog->_drc_u.drc_index);
|
|
break;
|
|
case PSERIES_HP_ELOG_ID_DRC_IC:
|
|
hp_elog->_drc_u.ic.count =
|
|
be32_to_cpu(hp_elog->_drc_u.ic.count);
|
|
hp_elog->_drc_u.ic.index =
|
|
be32_to_cpu(hp_elog->_drc_u.ic.index);
|
|
}
|
|
|
|
switch (hp_elog->resource) {
|
|
case PSERIES_HP_ELOG_RESOURCE_MEM:
|
|
rc = dlpar_memory(hp_elog);
|
|
break;
|
|
case PSERIES_HP_ELOG_RESOURCE_CPU:
|
|
rc = dlpar_cpu(hp_elog);
|
|
break;
|
|
case PSERIES_HP_ELOG_RESOURCE_PMEM:
|
|
rc = dlpar_hp_pmem(hp_elog);
|
|
break;
|
|
|
|
default:
|
|
pr_warn_ratelimited("Invalid resource (%d) specified\n",
|
|
hp_elog->resource);
|
|
rc = -EINVAL;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void pseries_hp_work_fn(struct work_struct *work)
|
|
{
|
|
struct pseries_hp_work *hp_work =
|
|
container_of(work, struct pseries_hp_work, work);
|
|
|
|
handle_dlpar_errorlog(hp_work->errlog);
|
|
|
|
kfree(hp_work->errlog);
|
|
kfree((void *)work);
|
|
}
|
|
|
|
void queue_hotplug_event(struct pseries_hp_errorlog *hp_errlog)
|
|
{
|
|
struct pseries_hp_work *work;
|
|
struct pseries_hp_errorlog *hp_errlog_copy;
|
|
|
|
hp_errlog_copy = kmemdup(hp_errlog, sizeof(*hp_errlog), GFP_ATOMIC);
|
|
if (!hp_errlog_copy)
|
|
return;
|
|
|
|
work = kmalloc(sizeof(struct pseries_hp_work), GFP_ATOMIC);
|
|
if (work) {
|
|
INIT_WORK((struct work_struct *)work, pseries_hp_work_fn);
|
|
work->errlog = hp_errlog_copy;
|
|
queue_work(pseries_hp_wq, (struct work_struct *)work);
|
|
} else {
|
|
kfree(hp_errlog_copy);
|
|
}
|
|
}
|
|
|
|
static int dlpar_parse_resource(char **cmd, struct pseries_hp_errorlog *hp_elog)
|
|
{
|
|
char *arg;
|
|
|
|
arg = strsep(cmd, " ");
|
|
if (!arg)
|
|
return -EINVAL;
|
|
|
|
if (sysfs_streq(arg, "memory")) {
|
|
hp_elog->resource = PSERIES_HP_ELOG_RESOURCE_MEM;
|
|
} else if (sysfs_streq(arg, "cpu")) {
|
|
hp_elog->resource = PSERIES_HP_ELOG_RESOURCE_CPU;
|
|
} else {
|
|
pr_err("Invalid resource specified.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dlpar_parse_action(char **cmd, struct pseries_hp_errorlog *hp_elog)
|
|
{
|
|
char *arg;
|
|
|
|
arg = strsep(cmd, " ");
|
|
if (!arg)
|
|
return -EINVAL;
|
|
|
|
if (sysfs_streq(arg, "add")) {
|
|
hp_elog->action = PSERIES_HP_ELOG_ACTION_ADD;
|
|
} else if (sysfs_streq(arg, "remove")) {
|
|
hp_elog->action = PSERIES_HP_ELOG_ACTION_REMOVE;
|
|
} else {
|
|
pr_err("Invalid action specified.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dlpar_parse_id_type(char **cmd, struct pseries_hp_errorlog *hp_elog)
|
|
{
|
|
char *arg;
|
|
u32 count, index;
|
|
|
|
arg = strsep(cmd, " ");
|
|
if (!arg)
|
|
return -EINVAL;
|
|
|
|
if (sysfs_streq(arg, "indexed-count")) {
|
|
hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_IC;
|
|
arg = strsep(cmd, " ");
|
|
if (!arg) {
|
|
pr_err("No DRC count specified.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (kstrtou32(arg, 0, &count)) {
|
|
pr_err("Invalid DRC count specified.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
arg = strsep(cmd, " ");
|
|
if (!arg) {
|
|
pr_err("No DRC Index specified.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (kstrtou32(arg, 0, &index)) {
|
|
pr_err("Invalid DRC Index specified.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
hp_elog->_drc_u.ic.count = cpu_to_be32(count);
|
|
hp_elog->_drc_u.ic.index = cpu_to_be32(index);
|
|
} else if (sysfs_streq(arg, "index")) {
|
|
hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_INDEX;
|
|
arg = strsep(cmd, " ");
|
|
if (!arg) {
|
|
pr_err("No DRC Index specified.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (kstrtou32(arg, 0, &index)) {
|
|
pr_err("Invalid DRC Index specified.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
hp_elog->_drc_u.drc_index = cpu_to_be32(index);
|
|
} else if (sysfs_streq(arg, "count")) {
|
|
hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_COUNT;
|
|
arg = strsep(cmd, " ");
|
|
if (!arg) {
|
|
pr_err("No DRC count specified.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (kstrtou32(arg, 0, &count)) {
|
|
pr_err("Invalid DRC count specified.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
hp_elog->_drc_u.drc_count = cpu_to_be32(count);
|
|
} else {
|
|
pr_err("Invalid id_type specified.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t dlpar_store(struct class *class, struct class_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct pseries_hp_errorlog hp_elog;
|
|
char *argbuf;
|
|
char *args;
|
|
int rc;
|
|
|
|
args = argbuf = kstrdup(buf, GFP_KERNEL);
|
|
if (!argbuf) {
|
|
pr_info("Could not allocate resources for DLPAR operation\n");
|
|
kfree(argbuf);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/*
|
|
* Parse out the request from the user, this will be in the form:
|
|
* <resource> <action> <id_type> <id>
|
|
*/
|
|
rc = dlpar_parse_resource(&args, &hp_elog);
|
|
if (rc)
|
|
goto dlpar_store_out;
|
|
|
|
rc = dlpar_parse_action(&args, &hp_elog);
|
|
if (rc)
|
|
goto dlpar_store_out;
|
|
|
|
rc = dlpar_parse_id_type(&args, &hp_elog);
|
|
if (rc)
|
|
goto dlpar_store_out;
|
|
|
|
rc = handle_dlpar_errorlog(&hp_elog);
|
|
|
|
dlpar_store_out:
|
|
kfree(argbuf);
|
|
|
|
if (rc)
|
|
pr_err("Could not handle DLPAR request \"%s\"\n", buf);
|
|
|
|
return rc ? rc : count;
|
|
}
|
|
|
|
static ssize_t dlpar_show(struct class *class, struct class_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return sprintf(buf, "%s\n", "memory,cpu");
|
|
}
|
|
|
|
static CLASS_ATTR_RW(dlpar);
|
|
|
|
int __init dlpar_workqueue_init(void)
|
|
{
|
|
if (pseries_hp_wq)
|
|
return 0;
|
|
|
|
pseries_hp_wq = alloc_workqueue("pseries hotplug workqueue",
|
|
WQ_UNBOUND, 1);
|
|
|
|
return pseries_hp_wq ? 0 : -ENOMEM;
|
|
}
|
|
|
|
static int __init dlpar_sysfs_init(void)
|
|
{
|
|
int rc;
|
|
|
|
rc = dlpar_workqueue_init();
|
|
if (rc)
|
|
return rc;
|
|
|
|
return sysfs_create_file(kernel_kobj, &class_attr_dlpar.attr);
|
|
}
|
|
machine_device_initcall(pseries, dlpar_sysfs_init);
|
|
|