544 lines
11 KiB
C
544 lines
11 KiB
C
/*
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* Support for dynamic reconfiguration for PCI, Memory, and CPU
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* Hotplug and Dynamic Logical Partitioning on RPA platforms.
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*
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* Copyright (C) 2009 Nathan Fontenot
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* Copyright (C) 2009 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/kref.h>
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#include <linux/notifier.h>
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#include <linux/spinlock.h>
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#include <linux/cpu.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include "offline_states.h"
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#include <asm/prom.h>
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#include <asm/machdep.h>
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#include <asm/uaccess.h>
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#include <asm/rtas.h>
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struct cc_workarea {
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u32 drc_index;
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u32 zero;
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u32 name_offset;
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u32 prop_length;
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u32 prop_offset;
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};
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void dlpar_free_cc_property(struct property *prop)
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{
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kfree(prop->name);
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kfree(prop->value);
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kfree(prop);
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}
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static struct property *dlpar_parse_cc_property(struct cc_workarea *ccwa)
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{
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struct property *prop;
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char *name;
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char *value;
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prop = kzalloc(sizeof(*prop), GFP_KERNEL);
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if (!prop)
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return NULL;
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name = (char *)ccwa + ccwa->name_offset;
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prop->name = kstrdup(name, GFP_KERNEL);
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prop->length = ccwa->prop_length;
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value = (char *)ccwa + ccwa->prop_offset;
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prop->value = kmemdup(value, prop->length, GFP_KERNEL);
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if (!prop->value) {
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dlpar_free_cc_property(prop);
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return NULL;
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}
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return prop;
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}
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static struct device_node *dlpar_parse_cc_node(struct cc_workarea *ccwa)
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{
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struct device_node *dn;
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char *name;
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dn = kzalloc(sizeof(*dn), GFP_KERNEL);
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if (!dn)
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return NULL;
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/* The configure connector reported name does not contain a
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* preceding '/', so we allocate a buffer large enough to
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* prepend this to the full_name.
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*/
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name = (char *)ccwa + ccwa->name_offset;
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dn->full_name = kasprintf(GFP_KERNEL, "/%s", name);
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if (!dn->full_name) {
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kfree(dn);
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return NULL;
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}
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return dn;
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}
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static void dlpar_free_one_cc_node(struct device_node *dn)
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{
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struct property *prop;
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while (dn->properties) {
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prop = dn->properties;
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dn->properties = prop->next;
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dlpar_free_cc_property(prop);
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}
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kfree(dn->full_name);
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kfree(dn);
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}
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void dlpar_free_cc_nodes(struct device_node *dn)
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{
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if (dn->child)
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dlpar_free_cc_nodes(dn->child);
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if (dn->sibling)
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dlpar_free_cc_nodes(dn->sibling);
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dlpar_free_one_cc_node(dn);
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}
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#define COMPLETE 0
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#define NEXT_SIBLING 1
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#define NEXT_CHILD 2
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#define NEXT_PROPERTY 3
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#define PREV_PARENT 4
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#define MORE_MEMORY 5
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#define CALL_AGAIN -2
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#define ERR_CFG_USE -9003
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struct device_node *dlpar_configure_connector(u32 drc_index)
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{
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struct device_node *dn;
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struct device_node *first_dn = NULL;
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struct device_node *last_dn = NULL;
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struct property *property;
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struct property *last_property = NULL;
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struct cc_workarea *ccwa;
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char *data_buf;
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int cc_token;
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int rc = -1;
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cc_token = rtas_token("ibm,configure-connector");
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if (cc_token == RTAS_UNKNOWN_SERVICE)
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return NULL;
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data_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
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if (!data_buf)
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return NULL;
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ccwa = (struct cc_workarea *)&data_buf[0];
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ccwa->drc_index = drc_index;
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ccwa->zero = 0;
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do {
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/* Since we release the rtas_data_buf lock between configure
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* connector calls we want to re-populate the rtas_data_buffer
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* with the contents of the previous call.
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*/
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spin_lock(&rtas_data_buf_lock);
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memcpy(rtas_data_buf, data_buf, RTAS_DATA_BUF_SIZE);
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rc = rtas_call(cc_token, 2, 1, NULL, rtas_data_buf, NULL);
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memcpy(data_buf, rtas_data_buf, RTAS_DATA_BUF_SIZE);
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spin_unlock(&rtas_data_buf_lock);
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switch (rc) {
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case COMPLETE:
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break;
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case NEXT_SIBLING:
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dn = dlpar_parse_cc_node(ccwa);
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if (!dn)
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goto cc_error;
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dn->parent = last_dn->parent;
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last_dn->sibling = dn;
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last_dn = dn;
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break;
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case NEXT_CHILD:
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dn = dlpar_parse_cc_node(ccwa);
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if (!dn)
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goto cc_error;
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if (!first_dn)
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first_dn = dn;
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else {
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dn->parent = last_dn;
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if (last_dn)
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last_dn->child = dn;
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}
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last_dn = dn;
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break;
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case NEXT_PROPERTY:
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property = dlpar_parse_cc_property(ccwa);
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if (!property)
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goto cc_error;
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if (!last_dn->properties)
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last_dn->properties = property;
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else
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last_property->next = property;
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last_property = property;
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break;
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case PREV_PARENT:
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last_dn = last_dn->parent;
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break;
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case CALL_AGAIN:
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break;
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case MORE_MEMORY:
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case ERR_CFG_USE:
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default:
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printk(KERN_ERR "Unexpected Error (%d) "
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"returned from configure-connector\n", rc);
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goto cc_error;
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}
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} while (rc);
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cc_error:
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kfree(data_buf);
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if (rc) {
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if (first_dn)
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dlpar_free_cc_nodes(first_dn);
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return NULL;
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}
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return first_dn;
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}
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static struct device_node *derive_parent(const char *path)
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{
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struct device_node *parent;
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char *last_slash;
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last_slash = strrchr(path, '/');
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if (last_slash == path) {
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parent = of_find_node_by_path("/");
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} else {
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char *parent_path;
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int parent_path_len = last_slash - path + 1;
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parent_path = kmalloc(parent_path_len, GFP_KERNEL);
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if (!parent_path)
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return NULL;
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strlcpy(parent_path, path, parent_path_len);
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parent = of_find_node_by_path(parent_path);
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kfree(parent_path);
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}
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return parent;
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}
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int dlpar_attach_node(struct device_node *dn)
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{
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int rc;
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of_node_set_flag(dn, OF_DYNAMIC);
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kref_init(&dn->kref);
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dn->parent = derive_parent(dn->full_name);
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if (!dn->parent)
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return -ENOMEM;
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rc = of_attach_node(dn);
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if (rc) {
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printk(KERN_ERR "Failed to add device node %s\n",
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dn->full_name);
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return rc;
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}
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of_node_put(dn->parent);
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return 0;
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}
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int dlpar_detach_node(struct device_node *dn)
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{
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int rc;
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rc = of_detach_node(dn);
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if (rc)
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return rc;
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of_node_put(dn); /* Must decrement the refcount */
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return 0;
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}
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#define DR_ENTITY_SENSE 9003
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#define DR_ENTITY_PRESENT 1
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#define DR_ENTITY_UNUSABLE 2
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#define ALLOCATION_STATE 9003
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#define ALLOC_UNUSABLE 0
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#define ALLOC_USABLE 1
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#define ISOLATION_STATE 9001
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#define ISOLATE 0
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#define UNISOLATE 1
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int dlpar_acquire_drc(u32 drc_index)
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{
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int dr_status, rc;
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rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status,
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DR_ENTITY_SENSE, drc_index);
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if (rc || dr_status != DR_ENTITY_UNUSABLE)
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return -1;
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rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_USABLE);
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if (rc)
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return rc;
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rc = rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
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if (rc) {
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rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
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return rc;
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}
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return 0;
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}
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int dlpar_release_drc(u32 drc_index)
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{
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int dr_status, rc;
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rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status,
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DR_ENTITY_SENSE, drc_index);
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if (rc || dr_status != DR_ENTITY_PRESENT)
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return -1;
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rc = rtas_set_indicator(ISOLATION_STATE, drc_index, ISOLATE);
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if (rc)
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return rc;
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rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
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if (rc) {
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rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
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return rc;
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}
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return 0;
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}
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#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
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static int dlpar_online_cpu(struct device_node *dn)
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{
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int rc = 0;
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unsigned int cpu;
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int len, nthreads, i;
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const u32 *intserv;
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intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len);
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if (!intserv)
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return -EINVAL;
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nthreads = len / sizeof(u32);
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cpu_maps_update_begin();
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for (i = 0; i < nthreads; i++) {
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for_each_present_cpu(cpu) {
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if (get_hard_smp_processor_id(cpu) != intserv[i])
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continue;
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BUG_ON(get_cpu_current_state(cpu)
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!= CPU_STATE_OFFLINE);
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cpu_maps_update_done();
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rc = cpu_up(cpu);
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if (rc)
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goto out;
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cpu_maps_update_begin();
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break;
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}
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if (cpu == num_possible_cpus())
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printk(KERN_WARNING "Could not find cpu to online "
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"with physical id 0x%x\n", intserv[i]);
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}
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cpu_maps_update_done();
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out:
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return rc;
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}
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static ssize_t dlpar_cpu_probe(const char *buf, size_t count)
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{
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struct device_node *dn;
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unsigned long drc_index;
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char *cpu_name;
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int rc;
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cpu_hotplug_driver_lock();
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rc = strict_strtoul(buf, 0, &drc_index);
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if (rc) {
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rc = -EINVAL;
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goto out;
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}
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dn = dlpar_configure_connector(drc_index);
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if (!dn) {
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rc = -EINVAL;
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goto out;
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}
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/* configure-connector reports cpus as living in the base
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* directory of the device tree. CPUs actually live in the
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* cpus directory so we need to fixup the full_name.
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*/
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cpu_name = kasprintf(GFP_KERNEL, "/cpus%s", dn->full_name);
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if (!cpu_name) {
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dlpar_free_cc_nodes(dn);
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rc = -ENOMEM;
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goto out;
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}
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kfree(dn->full_name);
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dn->full_name = cpu_name;
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rc = dlpar_acquire_drc(drc_index);
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if (rc) {
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dlpar_free_cc_nodes(dn);
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rc = -EINVAL;
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goto out;
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}
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rc = dlpar_attach_node(dn);
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if (rc) {
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dlpar_release_drc(drc_index);
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dlpar_free_cc_nodes(dn);
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goto out;
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}
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rc = dlpar_online_cpu(dn);
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out:
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cpu_hotplug_driver_unlock();
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return rc ? rc : count;
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}
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static int dlpar_offline_cpu(struct device_node *dn)
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{
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int rc = 0;
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unsigned int cpu;
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int len, nthreads, i;
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const u32 *intserv;
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intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len);
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if (!intserv)
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return -EINVAL;
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nthreads = len / sizeof(u32);
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cpu_maps_update_begin();
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for (i = 0; i < nthreads; i++) {
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for_each_present_cpu(cpu) {
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if (get_hard_smp_processor_id(cpu) != intserv[i])
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continue;
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if (get_cpu_current_state(cpu) == CPU_STATE_OFFLINE)
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break;
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if (get_cpu_current_state(cpu) == CPU_STATE_ONLINE) {
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set_preferred_offline_state(cpu, CPU_STATE_OFFLINE);
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cpu_maps_update_done();
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rc = cpu_down(cpu);
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if (rc)
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goto out;
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cpu_maps_update_begin();
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break;
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}
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/*
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* The cpu is in CPU_STATE_INACTIVE.
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* Upgrade it's state to CPU_STATE_OFFLINE.
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*/
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set_preferred_offline_state(cpu, CPU_STATE_OFFLINE);
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BUG_ON(plpar_hcall_norets(H_PROD, intserv[i])
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!= H_SUCCESS);
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__cpu_die(cpu);
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break;
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}
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if (cpu == num_possible_cpus())
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printk(KERN_WARNING "Could not find cpu to offline "
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"with physical id 0x%x\n", intserv[i]);
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}
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cpu_maps_update_done();
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out:
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return rc;
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}
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static ssize_t dlpar_cpu_release(const char *buf, size_t count)
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{
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struct device_node *dn;
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const u32 *drc_index;
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int rc;
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dn = of_find_node_by_path(buf);
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if (!dn)
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return -EINVAL;
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drc_index = of_get_property(dn, "ibm,my-drc-index", NULL);
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if (!drc_index) {
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of_node_put(dn);
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return -EINVAL;
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}
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cpu_hotplug_driver_lock();
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rc = dlpar_offline_cpu(dn);
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if (rc) {
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of_node_put(dn);
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rc = -EINVAL;
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goto out;
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}
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rc = dlpar_release_drc(*drc_index);
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if (rc) {
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of_node_put(dn);
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goto out;
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}
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rc = dlpar_detach_node(dn);
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if (rc) {
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dlpar_acquire_drc(*drc_index);
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goto out;
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}
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of_node_put(dn);
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out:
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cpu_hotplug_driver_unlock();
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return rc ? rc : count;
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}
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static int __init pseries_dlpar_init(void)
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{
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ppc_md.cpu_probe = dlpar_cpu_probe;
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ppc_md.cpu_release = dlpar_cpu_release;
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return 0;
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}
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machine_device_initcall(pseries, pseries_dlpar_init);
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#endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
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