594 lines
12 KiB
C
594 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#define pr_fmt(fmt) "dlpar: " fmt
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#include <linux/kernel.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 "of_helpers.h"
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#include "pseries.h"
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#include <asm/machdep.h>
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#include <linux/uaccess.h>
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#include <asm/rtas.h>
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static struct workqueue_struct *pseries_hp_wq;
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struct pseries_hp_work {
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struct work_struct work;
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struct pseries_hp_errorlog *errlog;
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};
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struct cc_workarea {
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__be32 drc_index;
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__be32 zero;
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__be32 name_offset;
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__be32 prop_length;
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__be32 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 + be32_to_cpu(ccwa->name_offset);
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prop->name = kstrdup(name, GFP_KERNEL);
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if (!prop->name) {
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dlpar_free_cc_property(prop);
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return NULL;
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}
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prop->length = be32_to_cpu(ccwa->prop_length);
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value = (char *)ccwa + be32_to_cpu(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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const 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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name = (const char *)ccwa + be32_to_cpu(ccwa->name_offset);
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dn->full_name = kstrdup(name, GFP_KERNEL);
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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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of_node_set_flag(dn, OF_DYNAMIC);
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of_node_init(dn);
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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 ERR_CFG_USE -9003
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struct device_node *dlpar_configure_connector(__be32 drc_index,
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struct device_node *parent)
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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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if (rtas_busy_delay(rc))
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continue;
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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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dn->parent = parent;
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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 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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int dlpar_attach_node(struct device_node *dn, struct device_node *parent)
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{
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int rc;
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dn->parent = parent;
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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 %pOF\n", dn);
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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_detach_node(struct device_node *dn)
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{
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struct device_node *child;
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int rc;
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child = of_get_next_child(dn, NULL);
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while (child) {
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dlpar_detach_node(child);
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child = of_get_next_child(dn, child);
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}
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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);
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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_get_sensor(DR_ENTITY_SENSE, drc_index, &dr_status);
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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_get_sensor(DR_ENTITY_SENSE, drc_index, &dr_status);
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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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int dlpar_unisolate_drc(u32 drc_index)
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{
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int dr_status, rc;
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rc = rtas_get_sensor(DR_ENTITY_SENSE, drc_index, &dr_status);
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if (rc || dr_status != DR_ENTITY_PRESENT)
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return -1;
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rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
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return 0;
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}
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int handle_dlpar_errorlog(struct pseries_hp_errorlog *hp_elog)
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{
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int rc;
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/* pseries error logs are in BE format, convert to cpu type */
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switch (hp_elog->id_type) {
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case PSERIES_HP_ELOG_ID_DRC_COUNT:
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hp_elog->_drc_u.drc_count =
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be32_to_cpu(hp_elog->_drc_u.drc_count);
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break;
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case PSERIES_HP_ELOG_ID_DRC_INDEX:
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hp_elog->_drc_u.drc_index =
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be32_to_cpu(hp_elog->_drc_u.drc_index);
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break;
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case PSERIES_HP_ELOG_ID_DRC_IC:
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hp_elog->_drc_u.ic.count =
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be32_to_cpu(hp_elog->_drc_u.ic.count);
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hp_elog->_drc_u.ic.index =
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be32_to_cpu(hp_elog->_drc_u.ic.index);
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}
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switch (hp_elog->resource) {
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case PSERIES_HP_ELOG_RESOURCE_MEM:
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rc = dlpar_memory(hp_elog);
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break;
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case PSERIES_HP_ELOG_RESOURCE_CPU:
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rc = dlpar_cpu(hp_elog);
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break;
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case PSERIES_HP_ELOG_RESOURCE_PMEM:
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rc = dlpar_hp_pmem(hp_elog);
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break;
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default:
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pr_warn_ratelimited("Invalid resource (%d) specified\n",
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hp_elog->resource);
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rc = -EINVAL;
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}
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return rc;
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}
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static void pseries_hp_work_fn(struct work_struct *work)
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{
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struct pseries_hp_work *hp_work =
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container_of(work, struct pseries_hp_work, work);
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handle_dlpar_errorlog(hp_work->errlog);
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kfree(hp_work->errlog);
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kfree(work);
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}
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void queue_hotplug_event(struct pseries_hp_errorlog *hp_errlog)
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{
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struct pseries_hp_work *work;
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struct pseries_hp_errorlog *hp_errlog_copy;
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hp_errlog_copy = kmemdup(hp_errlog, sizeof(*hp_errlog), GFP_ATOMIC);
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if (!hp_errlog_copy)
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return;
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work = kmalloc(sizeof(struct pseries_hp_work), GFP_ATOMIC);
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if (work) {
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INIT_WORK((struct work_struct *)work, pseries_hp_work_fn);
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work->errlog = hp_errlog_copy;
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queue_work(pseries_hp_wq, (struct work_struct *)work);
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} else {
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kfree(hp_errlog_copy);
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}
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}
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static int dlpar_parse_resource(char **cmd, struct pseries_hp_errorlog *hp_elog)
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{
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char *arg;
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arg = strsep(cmd, " ");
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if (!arg)
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return -EINVAL;
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if (sysfs_streq(arg, "memory")) {
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hp_elog->resource = PSERIES_HP_ELOG_RESOURCE_MEM;
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} else if (sysfs_streq(arg, "cpu")) {
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hp_elog->resource = PSERIES_HP_ELOG_RESOURCE_CPU;
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} else {
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pr_err("Invalid resource specified.\n");
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return -EINVAL;
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}
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return 0;
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}
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static int dlpar_parse_action(char **cmd, struct pseries_hp_errorlog *hp_elog)
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{
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char *arg;
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arg = strsep(cmd, " ");
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if (!arg)
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return -EINVAL;
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if (sysfs_streq(arg, "add")) {
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hp_elog->action = PSERIES_HP_ELOG_ACTION_ADD;
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} else if (sysfs_streq(arg, "remove")) {
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hp_elog->action = PSERIES_HP_ELOG_ACTION_REMOVE;
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} else {
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pr_err("Invalid action specified.\n");
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return -EINVAL;
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}
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return 0;
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}
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static int dlpar_parse_id_type(char **cmd, struct pseries_hp_errorlog *hp_elog)
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{
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char *arg;
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u32 count, index;
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arg = strsep(cmd, " ");
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if (!arg)
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return -EINVAL;
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if (sysfs_streq(arg, "indexed-count")) {
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hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_IC;
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arg = strsep(cmd, " ");
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if (!arg) {
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pr_err("No DRC count specified.\n");
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return -EINVAL;
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}
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if (kstrtou32(arg, 0, &count)) {
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pr_err("Invalid DRC count specified.\n");
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return -EINVAL;
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}
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arg = strsep(cmd, " ");
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if (!arg) {
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pr_err("No DRC Index specified.\n");
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return -EINVAL;
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}
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if (kstrtou32(arg, 0, &index)) {
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pr_err("Invalid DRC Index specified.\n");
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return -EINVAL;
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}
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hp_elog->_drc_u.ic.count = cpu_to_be32(count);
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hp_elog->_drc_u.ic.index = cpu_to_be32(index);
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} else if (sysfs_streq(arg, "index")) {
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hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_INDEX;
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arg = strsep(cmd, " ");
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if (!arg) {
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pr_err("No DRC Index specified.\n");
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return -EINVAL;
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}
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if (kstrtou32(arg, 0, &index)) {
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pr_err("Invalid DRC Index specified.\n");
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return -EINVAL;
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}
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hp_elog->_drc_u.drc_index = cpu_to_be32(index);
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} else if (sysfs_streq(arg, "count")) {
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hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_COUNT;
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arg = strsep(cmd, " ");
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if (!arg) {
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pr_err("No DRC count specified.\n");
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return -EINVAL;
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}
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if (kstrtou32(arg, 0, &count)) {
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pr_err("Invalid DRC count specified.\n");
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return -EINVAL;
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}
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hp_elog->_drc_u.drc_count = cpu_to_be32(count);
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} else {
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pr_err("Invalid id_type specified.\n");
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return -EINVAL;
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}
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return 0;
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}
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static ssize_t dlpar_store(struct class *class, struct class_attribute *attr,
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const char *buf, size_t count)
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{
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struct pseries_hp_errorlog hp_elog;
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char *argbuf;
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char *args;
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int rc;
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args = argbuf = kstrdup(buf, GFP_KERNEL);
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if (!argbuf)
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return -ENOMEM;
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/*
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* Parse out the request from the user, this will be in the form:
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* <resource> <action> <id_type> <id>
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*/
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rc = dlpar_parse_resource(&args, &hp_elog);
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if (rc)
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goto dlpar_store_out;
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rc = dlpar_parse_action(&args, &hp_elog);
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if (rc)
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goto dlpar_store_out;
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rc = dlpar_parse_id_type(&args, &hp_elog);
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if (rc)
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goto dlpar_store_out;
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rc = handle_dlpar_errorlog(&hp_elog);
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dlpar_store_out:
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kfree(argbuf);
|
|
|
|
if (rc)
|
|
pr_err("Could not handle DLPAR request \"%s\"\n", buf);
|
|
|
|
return rc ? rc : count;
|
|
}
|
|
|
|
static ssize_t dlpar_show(struct class *class, struct class_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return sprintf(buf, "%s\n", "memory,cpu");
|
|
}
|
|
|
|
static CLASS_ATTR_RW(dlpar);
|
|
|
|
int __init dlpar_workqueue_init(void)
|
|
{
|
|
if (pseries_hp_wq)
|
|
return 0;
|
|
|
|
pseries_hp_wq = alloc_workqueue("pseries hotplug workqueue",
|
|
WQ_UNBOUND, 1);
|
|
|
|
return pseries_hp_wq ? 0 : -ENOMEM;
|
|
}
|
|
|
|
static int __init dlpar_sysfs_init(void)
|
|
{
|
|
int rc;
|
|
|
|
rc = dlpar_workqueue_init();
|
|
if (rc)
|
|
return rc;
|
|
|
|
return sysfs_create_file(kernel_kobj, &class_attr_dlpar.attr);
|
|
}
|
|
machine_device_initcall(pseries, dlpar_sysfs_init);
|
|
|