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