From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- arch/powerpc/platforms/pseries/mobility.c | 370 ++++++++++++++++++++++++++++++ 1 file changed, 370 insertions(+) create mode 100644 arch/powerpc/platforms/pseries/mobility.c (limited to 'arch/powerpc/platforms/pseries/mobility.c') diff --git a/arch/powerpc/platforms/pseries/mobility.c b/arch/powerpc/platforms/pseries/mobility.c new file mode 100644 index 000000000..ceb18d349 --- /dev/null +++ b/arch/powerpc/platforms/pseries/mobility.c @@ -0,0 +1,370 @@ +/* + * Support for Partition Mobility/Migration + * + * Copyright (C) 2010 Nathan Fontenot + * Copyright (C) 2010 IBM Corporation + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License version + * 2 as published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include "pseries.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) + +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: + prop = of_find_property(dn, prop_name, NULL); + of_remove_property(dn, prop); + 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) + return -ENOENT; + + rc = dlpar_attach_node(dn); + if (rc) + dlpar_free_cc_nodes(dn); + + of_node_put(parent_dn); + return rc; +} + +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); + 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); + + rc = pseries_devicetree_update(MIGRATION_SCOPE); + if (rc) + printk(KERN_ERR "Post-mobility device tree update " + "failed: %d\n", rc); + + return; +} + +static ssize_t migrate_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; + + do { + rc = rtas_ibm_suspend_me(streamid); + if (rc == -EAGAIN) + ssleep(1); + } while (rc == -EAGAIN); + + if (rc) + return rc; + + post_mobility_fixup(); + 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(migration, S_IWUSR, NULL, migrate_store); +static CLASS_ATTR_STRING(api_version, S_IRUGO, __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); -- cgit v1.2.3-54-g00ecf