blob: fe812bebdf5e618261b6c4cec5dd809402697589 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-only
/*
* Support for Partition Mobility/Migration
*
* Copyright (C) 2010 Nathan Fontenot
* Copyright (C) 2010 IBM Corporation
*/
#include <linux/cpu.h>
#include <linux/kernel.h>
#include <linux/kobject.h>
#include <linux/smp.h>
#include <linux/stat.h>
#include <linux/completion.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/stringify.h>
#include <asm/machdep.h>
#include <asm/rtas.h>
#include "pseries.h"
#include "../../kernel/cacheinfo.h"
static struct kobject *mobility_kobj;
struct update_props_workarea {
__be32 phandle;
__be32 state;
__be64 reserved;
__be32 nprops;
} __packed;
#define NODE_ACTION_MASK 0xff000000
#define NODE_COUNT_MASK 0x00ffffff
#define DELETE_DT_NODE 0x01000000
#define UPDATE_DT_NODE 0x02000000
#define ADD_DT_NODE 0x03000000
#define MIGRATION_SCOPE (1)
#define PRRN_SCOPE -2
static int mobility_rtas_call(int token, char *buf, s32 scope)
{
int rc;
spin_lock(&rtas_data_buf_lock);
memcpy(rtas_data_buf, buf, RTAS_DATA_BUF_SIZE);
rc = rtas_call(token, 2, 1, NULL, rtas_data_buf, scope);
memcpy(buf, rtas_data_buf, RTAS_DATA_BUF_SIZE);
spin_unlock(&rtas_data_buf_lock);
return rc;
}
static int delete_dt_node(__be32 phandle)
{
struct device_node *dn;
dn = of_find_node_by_phandle(be32_to_cpu(phandle));
if (!dn)
return -ENOENT;
dlpar_detach_node(dn);
of_node_put(dn);
return 0;
}
static int update_dt_property(struct device_node *dn, struct property **prop,
const char *name, u32 vd, char *value)
{
struct property *new_prop = *prop;
int more = 0;
/* A negative 'vd' value indicates that only part of the new property
* value is contained in the buffer and we need to call
* ibm,update-properties again to get the rest of the value.
*
* A negative value is also the two's compliment of the actual value.
*/
if (vd & 0x80000000) {
vd = ~vd + 1;
more = 1;
}
if (new_prop) {
/* partial property fixup */
char *new_data = kzalloc(new_prop->length + vd, GFP_KERNEL);
if (!new_data)
return -ENOMEM;
memcpy(new_data, new_prop->value, new_prop->length);
memcpy(new_data + new_prop->length, value, vd);
kfree(new_prop->value);
new_prop->value = new_data;
new_prop->length += vd;
} else {
new_prop = kzalloc(sizeof(*new_prop), GFP_KERNEL);
if (!new_prop)
return -ENOMEM;
new_prop->name = kstrdup(name, GFP_KERNEL);
if (!new_prop->name) {
kfree(new_prop);
return -ENOMEM;
}
new_prop->length = vd;
new_prop->value = kzalloc(new_prop->length, GFP_KERNEL);
if (!new_prop->value) {
kfree(new_prop->name);
kfree(new_prop);
return -ENOMEM;
}
memcpy(new_prop->value, value, vd);
*prop = new_prop;
}
if (!more) {
of_update_property(dn, new_prop);
*prop = NULL;
}
return 0;
}
static int update_dt_node(__be32 phandle, s32 scope)
{
struct update_props_workarea *upwa;
struct device_node *dn;
struct property *prop = NULL;
int i, rc, rtas_rc;
char *prop_data;
char *rtas_buf;
int update_properties_token;
u32 nprops;
u32 vd;
update_properties_token = rtas_token("ibm,update-properties");
if (update_properties_token == RTAS_UNKNOWN_SERVICE)
return -EINVAL;
rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
if (!rtas_buf)
return -ENOMEM;
dn = of_find_node_by_phandle(be32_to_cpu(phandle));
if (!dn) {
kfree(rtas_buf);
return -ENOENT;
}
upwa = (struct update_props_workarea *)&rtas_buf[0];
upwa->phandle = phandle;
do {
rtas_rc = mobility_rtas_call(update_properties_token, rtas_buf,
scope);
if (rtas_rc < 0)
break;
prop_data = rtas_buf + sizeof(*upwa);
nprops = be32_to_cpu(upwa->nprops);
/* On the first call to ibm,update-properties for a node the
* the first property value descriptor contains an empty
* property name, the property value length encoded as u32,
* and the property value is the node path being updated.
*/
if (*prop_data == 0) {
prop_data++;
vd = be32_to_cpu(*(__be32 *)prop_data);
prop_data += vd + sizeof(vd);
nprops--;
}
for (i = 0; i < nprops; i++) {
char *prop_name;
prop_name = prop_data;
prop_data += strlen(prop_name) + 1;
vd = be32_to_cpu(*(__be32 *)prop_data);
prop_data += sizeof(vd);
switch (vd) {
case 0x00000000:
/* name only property, nothing to do */
break;
case 0x80000000:
of_remove_property(dn, of_find_property(dn,
prop_name, NULL));
prop = NULL;
break;
default:
rc = update_dt_property(dn, &prop, prop_name,
vd, prop_data);
if (rc) {
printk(KERN_ERR "Could not update %s"
" property\n", prop_name);
}
prop_data += vd;
}
}
} while (rtas_rc == 1);
of_node_put(dn);
kfree(rtas_buf);
return 0;
}
static int add_dt_node(__be32 parent_phandle, __be32 drc_index)
{
struct device_node *dn;
struct device_node *parent_dn;
int rc;
parent_dn = of_find_node_by_phandle(be32_to_cpu(parent_phandle));
if (!parent_dn)
return -ENOENT;
dn = dlpar_configure_connector(drc_index, parent_dn);
if (!dn) {
of_node_put(parent_dn);
return -ENOENT;
}
rc = dlpar_attach_node(dn, parent_dn);
if (rc)
dlpar_free_cc_nodes(dn);
of_node_put(parent_dn);
return rc;
}
static void prrn_update_node(__be32 phandle)
{
struct pseries_hp_errorlog hp_elog;
struct device_node *dn;
/*
* If a node is found from a the given phandle, the phandle does not
* represent the drc index of an LMB and we can ignore.
*/
dn = of_find_node_by_phandle(be32_to_cpu(phandle));
if (dn) {
of_node_put(dn);
return;
}
hp_elog.resource = PSERIES_HP_ELOG_RESOURCE_MEM;
hp_elog.action = PSERIES_HP_ELOG_ACTION_READD;
hp_elog.id_type = PSERIES_HP_ELOG_ID_DRC_INDEX;
hp_elog._drc_u.drc_index = phandle;
handle_dlpar_errorlog(&hp_elog);
}
int pseries_devicetree_update(s32 scope)
{
char *rtas_buf;
__be32 *data;
int update_nodes_token;
int rc;
update_nodes_token = rtas_token("ibm,update-nodes");
if (update_nodes_token == RTAS_UNKNOWN_SERVICE)
return -EINVAL;
rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
if (!rtas_buf)
return -ENOMEM;
do {
rc = mobility_rtas_call(update_nodes_token, rtas_buf, scope);
if (rc && rc != 1)
break;
data = (__be32 *)rtas_buf + 4;
while (be32_to_cpu(*data) & NODE_ACTION_MASK) {
int i;
u32 action = be32_to_cpu(*data) & NODE_ACTION_MASK;
u32 node_count = be32_to_cpu(*data) & NODE_COUNT_MASK;
data++;
for (i = 0; i < node_count; i++) {
__be32 phandle = *data++;
__be32 drc_index;
switch (action) {
case DELETE_DT_NODE:
delete_dt_node(phandle);
break;
case UPDATE_DT_NODE:
update_dt_node(phandle, scope);
if (scope == PRRN_SCOPE)
prrn_update_node(phandle);
break;
case ADD_DT_NODE:
drc_index = *data++;
add_dt_node(phandle, drc_index);
break;
}
}
}
} while (rc == 1);
kfree(rtas_buf);
return rc;
}
void post_mobility_fixup(void)
{
int rc;
int activate_fw_token;
activate_fw_token = rtas_token("ibm,activate-firmware");
if (activate_fw_token == RTAS_UNKNOWN_SERVICE) {
printk(KERN_ERR "Could not make post-mobility "
"activate-fw call.\n");
return;
}
do {
rc = rtas_call(activate_fw_token, 0, 1, NULL);
} while (rtas_busy_delay(rc));
if (rc)
printk(KERN_ERR "Post-mobility activate-fw failed: %d\n", rc);
/*
* We don't want CPUs to go online/offline while the device
* tree is being updated.
*/
cpus_read_lock();
/*
* It's common for the destination firmware to replace cache
* nodes. Release all of the cacheinfo hierarchy's references
* before updating the device tree.
*/
cacheinfo_teardown();
rc = pseries_devicetree_update(MIGRATION_SCOPE);
if (rc)
printk(KERN_ERR "Post-mobility device tree update "
"failed: %d\n", rc);
cacheinfo_rebuild();
cpus_read_unlock();
/* Possibly switch to a new RFI flush type */
pseries_setup_rfi_flush();
return;
}
static ssize_t migration_store(struct class *class,
struct class_attribute *attr, const char *buf,
size_t count)
{
u64 streamid;
int rc;
rc = kstrtou64(buf, 0, &streamid);
if (rc)
return rc;
stop_topology_update();
do {
rc = rtas_ibm_suspend_me(streamid);
if (rc == -EAGAIN)
ssleep(1);
} while (rc == -EAGAIN);
if (rc)
return rc;
post_mobility_fixup();
start_topology_update();
return count;
}
/*
* Used by drmgr to determine the kernel behavior of the migration interface.
*
* Version 1: Performs all PAPR requirements for migration including
* firmware activation and device tree update.
*/
#define MIGRATION_API_VERSION 1
static CLASS_ATTR_WO(migration);
static CLASS_ATTR_STRING(api_version, 0444, __stringify(MIGRATION_API_VERSION));
static int __init mobility_sysfs_init(void)
{
int rc;
mobility_kobj = kobject_create_and_add("mobility", kernel_kobj);
if (!mobility_kobj)
return -ENOMEM;
rc = sysfs_create_file(mobility_kobj, &class_attr_migration.attr);
if (rc)
pr_err("mobility: unable to create migration sysfs file (%d)\n", rc);
rc = sysfs_create_file(mobility_kobj, &class_attr_api_version.attr.attr);
if (rc)
pr_err("mobility: unable to create api_version sysfs file (%d)\n", rc);
return 0;
}
machine_device_initcall(pseries, mobility_sysfs_init);