739 lines
16 KiB
C
739 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#define pr_fmt(fmt) "mobility: " fmt
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#include <linux/cpu.h>
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#include <linux/kernel.h>
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#include <linux/kobject.h>
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#include <linux/nmi.h>
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#include <linux/sched.h>
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#include <linux/smp.h>
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#include <linux/stat.h>
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#include <linux/stop_machine.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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#include "vas.h" /* vas_migration_handler() */
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#include "../../kernel/cacheinfo.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(struct device_node *dn)
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{
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struct device_node *pdn;
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bool is_platfac;
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pdn = of_get_parent(dn);
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is_platfac = of_node_is_type(dn, "ibm,platform-facilities") ||
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of_node_is_type(pdn, "ibm,platform-facilities");
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of_node_put(pdn);
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/*
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* The drivers that bind to nodes in the platform-facilities
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* hierarchy don't support node removal, and the removal directive
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* from firmware is always followed by an add of an equivalent
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* node. The capability (e.g. RNG, encryption, compression)
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* represented by the node is never interrupted by the migration.
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* So ignore changes to this part of the tree.
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*/
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if (is_platfac) {
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pr_notice("ignoring remove operation for %pOFfp\n", dn);
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return 0;
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}
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pr_debug("removing node %pOFfp\n", dn);
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dlpar_detach_node(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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pr_debug("updating node %pOF property %s\n", dn, name);
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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(struct device_node *dn, s32 scope)
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{
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struct update_props_workarea *upwa;
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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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upwa = (struct update_props_workarea *)&rtas_buf[0];
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upwa->phandle = cpu_to_be32(dn->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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pr_err("updating %s property failed: %d\n",
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prop_name, rc);
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}
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prop_data += vd;
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break;
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}
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cond_resched();
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}
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cond_resched();
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} while (rtas_rc == 1);
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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(struct device_node *parent_dn, __be32 drc_index)
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{
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struct device_node *dn;
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int rc;
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dn = dlpar_configure_connector(drc_index, parent_dn);
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if (!dn)
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return -ENOENT;
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/*
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* Since delete_dt_node() ignores this node type, this is the
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* necessary counterpart. We also know that a platform-facilities
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* node returned from dlpar_configure_connector() has children
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* attached, and dlpar_attach_node() only adds the parent, leaking
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* the children. So ignore these on the add side for now.
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*/
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if (of_node_is_type(dn, "ibm,platform-facilities")) {
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pr_notice("ignoring add operation for %pOF\n", dn);
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dlpar_free_cc_nodes(dn);
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return 0;
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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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pr_debug("added node %pOFfp\n", dn);
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return rc;
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}
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static 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 0;
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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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struct device_node *np;
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__be32 phandle = *data++;
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__be32 drc_index;
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np = of_find_node_by_phandle(be32_to_cpu(phandle));
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if (!np) {
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pr_warn("Failed lookup: phandle 0x%x for action 0x%x\n",
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be32_to_cpu(phandle), action);
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continue;
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}
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switch (action) {
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case DELETE_DT_NODE:
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delete_dt_node(np);
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break;
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case UPDATE_DT_NODE:
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update_dt_node(np, scope);
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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(np, drc_index);
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break;
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}
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of_node_put(np);
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cond_resched();
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}
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}
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cond_resched();
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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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rtas_activate_firmware();
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/*
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* We don't want CPUs to go online/offline while the device
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* tree is being updated.
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*/
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cpus_read_lock();
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/*
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* It's common for the destination firmware to replace cache
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* nodes. Release all of the cacheinfo hierarchy's references
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* before updating the device tree.
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*/
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cacheinfo_teardown();
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rc = pseries_devicetree_update(MIGRATION_SCOPE);
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if (rc)
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pr_err("device tree update failed: %d\n", rc);
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cacheinfo_rebuild();
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cpus_read_unlock();
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/* Possibly switch to a new L1 flush type */
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pseries_setup_security_mitigations();
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/* Reinitialise system information for hv-24x7 */
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read_24x7_sys_info();
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return;
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}
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static int poll_vasi_state(u64 handle, unsigned long *res)
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{
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unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
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long hvrc;
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int ret;
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hvrc = plpar_hcall(H_VASI_STATE, retbuf, handle);
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switch (hvrc) {
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case H_SUCCESS:
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ret = 0;
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*res = retbuf[0];
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break;
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case H_PARAMETER:
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ret = -EINVAL;
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break;
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case H_FUNCTION:
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ret = -EOPNOTSUPP;
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break;
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case H_HARDWARE:
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default:
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pr_err("unexpected H_VASI_STATE result %ld\n", hvrc);
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ret = -EIO;
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break;
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}
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return ret;
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}
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static int wait_for_vasi_session_suspending(u64 handle)
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{
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unsigned long state;
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int ret;
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/*
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* Wait for transition from H_VASI_ENABLED to
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* H_VASI_SUSPENDING. Treat anything else as an error.
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*/
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while (true) {
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ret = poll_vasi_state(handle, &state);
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if (ret != 0 || state == H_VASI_SUSPENDING) {
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break;
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} else if (state == H_VASI_ENABLED) {
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ssleep(1);
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} else {
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pr_err("unexpected H_VASI_STATE result %lu\n", state);
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ret = -EIO;
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break;
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}
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}
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/*
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* Proceed even if H_VASI_STATE is unavailable. If H_JOIN or
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* ibm,suspend-me are also unimplemented, we'll recover then.
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*/
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if (ret == -EOPNOTSUPP)
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ret = 0;
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return ret;
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}
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static void prod_single(unsigned int target_cpu)
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{
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long hvrc;
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int hwid;
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hwid = get_hard_smp_processor_id(target_cpu);
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hvrc = plpar_hcall_norets(H_PROD, hwid);
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if (hvrc == H_SUCCESS)
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return;
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pr_err_ratelimited("H_PROD of CPU %u (hwid %d) error: %ld\n",
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target_cpu, hwid, hvrc);
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}
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static void prod_others(void)
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{
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unsigned int cpu;
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for_each_online_cpu(cpu) {
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if (cpu != smp_processor_id())
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prod_single(cpu);
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}
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}
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static u16 clamp_slb_size(void)
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{
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#ifdef CONFIG_PPC_64S_HASH_MMU
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u16 prev = mmu_slb_size;
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slb_set_size(SLB_MIN_SIZE);
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return prev;
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#else
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return 0;
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#endif
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}
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static int do_suspend(void)
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{
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u16 saved_slb_size;
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int status;
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int ret;
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pr_info("calling ibm,suspend-me on CPU %i\n", smp_processor_id());
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/*
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* The destination processor model may have fewer SLB entries
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* than the source. We reduce mmu_slb_size to a safe minimum
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* before suspending in order to minimize the possibility of
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* programming non-existent entries on the destination. If
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* suspend fails, we restore it before returning. On success
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* the OF reconfig path will update it from the new device
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* tree after resuming on the destination.
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*/
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saved_slb_size = clamp_slb_size();
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ret = rtas_ibm_suspend_me(&status);
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if (ret != 0) {
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pr_err("ibm,suspend-me error: %d\n", status);
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slb_set_size(saved_slb_size);
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}
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return ret;
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}
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|
|
/**
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* struct pseries_suspend_info - State shared between CPUs for join/suspend.
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* @counter: Threads are to increment this upon resuming from suspend
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* or if an error is received from H_JOIN. The thread which performs
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* the first increment (i.e. sets it to 1) is responsible for
|
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* waking the other threads.
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* @done: False if join/suspend is in progress. True if the operation is
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* complete (successful or not).
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*/
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struct pseries_suspend_info {
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atomic_t counter;
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bool done;
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};
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static int do_join(void *arg)
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{
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struct pseries_suspend_info *info = arg;
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atomic_t *counter = &info->counter;
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long hvrc;
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int ret;
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retry:
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/* Must ensure MSR.EE off for H_JOIN. */
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hard_irq_disable();
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hvrc = plpar_hcall_norets(H_JOIN);
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switch (hvrc) {
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case H_CONTINUE:
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/*
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* All other CPUs are offline or in H_JOIN. This CPU
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* attempts the suspend.
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*/
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ret = do_suspend();
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break;
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case H_SUCCESS:
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/*
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* The suspend is complete and this cpu has received a
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* prod, or we've received a stray prod from unrelated
|
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* code (e.g. paravirt spinlocks) and we need to join
|
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* again.
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*
|
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* This barrier orders the return from H_JOIN above vs
|
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* the load of info->done. It pairs with the barrier
|
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* in the wakeup/prod path below.
|
|
*/
|
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smp_mb();
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if (READ_ONCE(info->done) == false) {
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pr_info_ratelimited("premature return from H_JOIN on CPU %i, retrying",
|
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smp_processor_id());
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goto retry;
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}
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ret = 0;
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break;
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case H_BAD_MODE:
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case H_HARDWARE:
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default:
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ret = -EIO;
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pr_err_ratelimited("H_JOIN error %ld on CPU %i\n",
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hvrc, smp_processor_id());
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break;
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}
|
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|
|
if (atomic_inc_return(counter) == 1) {
|
|
pr_info("CPU %u waking all threads\n", smp_processor_id());
|
|
WRITE_ONCE(info->done, true);
|
|
/*
|
|
* This barrier orders the store to info->done vs subsequent
|
|
* H_PRODs to wake the other CPUs. It pairs with the barrier
|
|
* in the H_SUCCESS case above.
|
|
*/
|
|
smp_mb();
|
|
prod_others();
|
|
}
|
|
/*
|
|
* Execution may have been suspended for several seconds, so
|
|
* reset the watchdog.
|
|
*/
|
|
touch_nmi_watchdog();
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Abort reason code byte 0. We use only the 'Migrating partition' value.
|
|
*/
|
|
enum vasi_aborting_entity {
|
|
ORCHESTRATOR = 1,
|
|
VSP_SOURCE = 2,
|
|
PARTITION_FIRMWARE = 3,
|
|
PLATFORM_FIRMWARE = 4,
|
|
VSP_TARGET = 5,
|
|
MIGRATING_PARTITION = 6,
|
|
};
|
|
|
|
static void pseries_cancel_migration(u64 handle, int err)
|
|
{
|
|
u32 reason_code;
|
|
u32 detail;
|
|
u8 entity;
|
|
long hvrc;
|
|
|
|
entity = MIGRATING_PARTITION;
|
|
detail = abs(err) & 0xffffff;
|
|
reason_code = (entity << 24) | detail;
|
|
|
|
hvrc = plpar_hcall_norets(H_VASI_SIGNAL, handle,
|
|
H_VASI_SIGNAL_CANCEL, reason_code);
|
|
if (hvrc)
|
|
pr_err("H_VASI_SIGNAL error: %ld\n", hvrc);
|
|
}
|
|
|
|
static int pseries_suspend(u64 handle)
|
|
{
|
|
const unsigned int max_attempts = 5;
|
|
unsigned int retry_interval_ms = 1;
|
|
unsigned int attempt = 1;
|
|
int ret;
|
|
|
|
while (true) {
|
|
struct pseries_suspend_info info;
|
|
unsigned long vasi_state;
|
|
int vasi_err;
|
|
|
|
info = (struct pseries_suspend_info) {
|
|
.counter = ATOMIC_INIT(0),
|
|
.done = false,
|
|
};
|
|
|
|
ret = stop_machine(do_join, &info, cpu_online_mask);
|
|
if (ret == 0)
|
|
break;
|
|
/*
|
|
* Encountered an error. If the VASI stream is still
|
|
* in Suspending state, it's likely a transient
|
|
* condition related to some device in the partition
|
|
* and we can retry in the hope that the cause has
|
|
* cleared after some delay.
|
|
*
|
|
* A better design would allow drivers etc to prepare
|
|
* for the suspend and avoid conditions which prevent
|
|
* the suspend from succeeding. For now, we have this
|
|
* mitigation.
|
|
*/
|
|
pr_notice("Partition suspend attempt %u of %u error: %d\n",
|
|
attempt, max_attempts, ret);
|
|
|
|
if (attempt == max_attempts)
|
|
break;
|
|
|
|
vasi_err = poll_vasi_state(handle, &vasi_state);
|
|
if (vasi_err == 0) {
|
|
if (vasi_state != H_VASI_SUSPENDING) {
|
|
pr_notice("VASI state %lu after failed suspend\n",
|
|
vasi_state);
|
|
break;
|
|
}
|
|
} else if (vasi_err != -EOPNOTSUPP) {
|
|
pr_err("VASI state poll error: %d", vasi_err);
|
|
break;
|
|
}
|
|
|
|
pr_notice("Will retry partition suspend after %u ms\n",
|
|
retry_interval_ms);
|
|
|
|
msleep(retry_interval_ms);
|
|
retry_interval_ms *= 10;
|
|
attempt++;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int pseries_migrate_partition(u64 handle)
|
|
{
|
|
int ret;
|
|
|
|
ret = wait_for_vasi_session_suspending(handle);
|
|
if (ret)
|
|
return ret;
|
|
|
|
vas_migration_handler(VAS_SUSPEND);
|
|
|
|
ret = pseries_suspend(handle);
|
|
if (ret == 0)
|
|
post_mobility_fixup();
|
|
else
|
|
pseries_cancel_migration(handle, ret);
|
|
|
|
vas_migration_handler(VAS_RESUME);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int rtas_syscall_dispatch_ibm_suspend_me(u64 handle)
|
|
{
|
|
return pseries_migrate_partition(handle);
|
|
}
|
|
|
|
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;
|
|
|
|
rc = pseries_migrate_partition(streamid);
|
|
if (rc)
|
|
return rc;
|
|
|
|
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("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("unable to create api_version sysfs file (%d)\n", rc);
|
|
|
|
return 0;
|
|
}
|
|
machine_device_initcall(pseries, mobility_sysfs_init);
|