![Benjamin Herrenschmidt](/assets/img/avatar_default.png)
This ensures that the translations for unmapped IO mappings or unmapped memory are properly removed from the MMU hash table before such an unplug. Without this, the hypervisor refuses the unplug operations due to those resources still being mapped by the partition. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
443 lines
11 KiB
C
443 lines
11 KiB
C
/*
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* PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
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* Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Send feedback to <lxie@us.ibm.com>
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/pci.h>
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#include <linux/pci_hotplug.h>
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#include <linux/smp.h>
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#include <linux/init.h>
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#include <linux/vmalloc.h>
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#include <asm/eeh.h> /* for eeh_add_device() */
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#include <asm/rtas.h> /* rtas_call */
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#include <asm/pci-bridge.h> /* for pci_controller */
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#include "../pci.h" /* for pci_add_new_bus */
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/* and pci_do_scan_bus */
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#include "rpaphp.h"
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int rpaphp_debug;
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LIST_HEAD(rpaphp_slot_head);
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#define DRIVER_VERSION "0.1"
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#define DRIVER_AUTHOR "Linda Xie <lxie@us.ibm.com>"
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#define DRIVER_DESC "RPA HOT Plug PCI Controller Driver"
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#define MAX_LOC_CODE 128
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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module_param_named(debug, rpaphp_debug, bool, 0644);
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/**
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* set_attention_status - set attention LED
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* @hotplug_slot: target &hotplug_slot
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* @value: LED control value
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*
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* echo 0 > attention -- set LED OFF
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* echo 1 > attention -- set LED ON
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* echo 2 > attention -- set LED ID(identify, light is blinking)
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*/
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static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value)
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{
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int rc;
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struct slot *slot = (struct slot *)hotplug_slot->private;
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switch (value) {
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case 0:
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case 1:
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case 2:
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break;
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default:
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value = 1;
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break;
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}
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rc = rtas_set_indicator(DR_INDICATOR, slot->index, value);
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if (!rc)
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hotplug_slot->info->attention_status = value;
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return rc;
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}
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/**
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* get_power_status - get power status of a slot
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* @hotplug_slot: slot to get status
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* @value: pointer to store status
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*/
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static int get_power_status(struct hotplug_slot *hotplug_slot, u8 * value)
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{
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int retval, level;
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struct slot *slot = (struct slot *)hotplug_slot->private;
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retval = rtas_get_power_level (slot->power_domain, &level);
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if (!retval)
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*value = level;
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return retval;
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}
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/**
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* get_attention_status - get attention LED status
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* @hotplug_slot: slot to get status
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* @value: pointer to store status
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*/
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static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value)
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{
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struct slot *slot = (struct slot *)hotplug_slot->private;
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*value = slot->hotplug_slot->info->attention_status;
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return 0;
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}
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static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 * value)
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{
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struct slot *slot = (struct slot *)hotplug_slot->private;
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int rc, state;
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rc = rpaphp_get_sensor_state(slot, &state);
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*value = NOT_VALID;
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if (rc)
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return rc;
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if (state == EMPTY)
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*value = EMPTY;
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else if (state == PRESENT)
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*value = slot->state;
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return 0;
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}
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static enum pci_bus_speed get_max_bus_speed(struct slot *slot)
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{
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enum pci_bus_speed speed;
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switch (slot->type) {
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case 1:
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case 2:
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case 3:
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case 4:
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case 5:
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case 6:
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speed = PCI_SPEED_33MHz; /* speed for case 1-6 */
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break;
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case 7:
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case 8:
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speed = PCI_SPEED_66MHz;
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break;
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case 11:
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case 14:
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speed = PCI_SPEED_66MHz_PCIX;
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break;
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case 12:
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case 15:
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speed = PCI_SPEED_100MHz_PCIX;
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break;
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case 13:
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case 16:
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speed = PCI_SPEED_133MHz_PCIX;
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break;
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default:
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speed = PCI_SPEED_UNKNOWN;
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break;
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}
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return speed;
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}
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static int get_children_props(struct device_node *dn, const int **drc_indexes,
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const int **drc_names, const int **drc_types,
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const int **drc_power_domains)
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{
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const int *indexes, *names, *types, *domains;
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indexes = of_get_property(dn, "ibm,drc-indexes", NULL);
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names = of_get_property(dn, "ibm,drc-names", NULL);
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types = of_get_property(dn, "ibm,drc-types", NULL);
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domains = of_get_property(dn, "ibm,drc-power-domains", NULL);
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if (!indexes || !names || !types || !domains) {
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/* Slot does not have dynamically-removable children */
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return -EINVAL;
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}
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if (drc_indexes)
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*drc_indexes = indexes;
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if (drc_names)
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/* &drc_names[1] contains NULL terminated slot names */
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*drc_names = names;
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if (drc_types)
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/* &drc_types[1] contains NULL terminated slot types */
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*drc_types = types;
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if (drc_power_domains)
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*drc_power_domains = domains;
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return 0;
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}
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/* To get the DRC props describing the current node, first obtain it's
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* my-drc-index property. Next obtain the DRC list from it's parent. Use
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* the my-drc-index for correlation, and obtain the requested properties.
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*/
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int rpaphp_get_drc_props(struct device_node *dn, int *drc_index,
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char **drc_name, char **drc_type, int *drc_power_domain)
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{
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const int *indexes, *names;
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const int *types, *domains;
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const unsigned int *my_index;
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char *name_tmp, *type_tmp;
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int i, rc;
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my_index = of_get_property(dn, "ibm,my-drc-index", NULL);
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if (!my_index) {
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/* Node isn't DLPAR/hotplug capable */
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return -EINVAL;
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}
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rc = get_children_props(dn->parent, &indexes, &names, &types, &domains);
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if (rc < 0) {
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return -EINVAL;
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}
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name_tmp = (char *) &names[1];
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type_tmp = (char *) &types[1];
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/* Iterate through parent properties, looking for my-drc-index */
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for (i = 0; i < indexes[0]; i++) {
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if ((unsigned int) indexes[i + 1] == *my_index) {
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if (drc_name)
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*drc_name = name_tmp;
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if (drc_type)
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*drc_type = type_tmp;
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if (drc_index)
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*drc_index = *my_index;
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if (drc_power_domain)
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*drc_power_domain = domains[i+1];
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return 0;
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}
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name_tmp += (strlen(name_tmp) + 1);
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type_tmp += (strlen(type_tmp) + 1);
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}
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return -EINVAL;
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}
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static int is_php_type(char *drc_type)
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{
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unsigned long value;
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char *endptr;
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/* PCI Hotplug nodes have an integer for drc_type */
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value = simple_strtoul(drc_type, &endptr, 10);
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if (endptr == drc_type)
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return 0;
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return 1;
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}
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/**
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* is_php_dn() - return 1 if this is a hotpluggable pci slot, else 0
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* @dn: target &device_node
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* @indexes: passed to get_children_props()
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* @names: passed to get_children_props()
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* @types: returned from get_children_props()
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* @power_domains:
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*
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* This routine will return true only if the device node is
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* a hotpluggable slot. This routine will return false
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* for built-in pci slots (even when the built-in slots are
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* dlparable.)
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*/
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static int is_php_dn(struct device_node *dn, const int **indexes,
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const int **names, const int **types, const int **power_domains)
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{
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const int *drc_types;
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int rc;
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rc = get_children_props(dn, indexes, names, &drc_types, power_domains);
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if (rc < 0)
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return 0;
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if (!is_php_type((char *) &drc_types[1]))
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return 0;
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*types = drc_types;
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return 1;
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}
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/**
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* rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem.
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* @dn: device node of slot
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*
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* This subroutine will register a hotplugable slot with the
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* PCI hotplug infrastructure. This routine is typicaly called
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* during boot time, if the hotplug slots are present at boot time,
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* or is called later, by the dlpar add code, if the slot is
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* being dynamically added during runtime.
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*
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* If the device node points at an embedded (built-in) slot, this
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* routine will just return without doing anything, since embedded
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* slots cannot be hotplugged.
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*
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* To remove a slot, it suffices to call rpaphp_deregister_slot().
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*/
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int rpaphp_add_slot(struct device_node *dn)
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{
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struct slot *slot;
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int retval = 0;
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int i;
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const int *indexes, *names, *types, *power_domains;
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char *name, *type;
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if (!dn->name || strcmp(dn->name, "pci"))
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return 0;
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/* If this is not a hotplug slot, return without doing anything. */
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if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))
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return 0;
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dbg("Entry %s: dn->full_name=%s\n", __func__, dn->full_name);
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/* register PCI devices */
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name = (char *) &names[1];
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type = (char *) &types[1];
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for (i = 0; i < indexes[0]; i++) {
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slot = alloc_slot_struct(dn, indexes[i + 1], name, power_domains[i + 1]);
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if (!slot)
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return -ENOMEM;
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slot->type = simple_strtoul(type, NULL, 10);
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dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n",
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indexes[i + 1], name, type);
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retval = rpaphp_enable_slot(slot);
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if (!retval)
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retval = rpaphp_register_slot(slot);
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if (retval)
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dealloc_slot_struct(slot);
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name += strlen(name) + 1;
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type += strlen(type) + 1;
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}
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dbg("%s - Exit: rc[%d]\n", __func__, retval);
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/* XXX FIXME: reports a failure only if last entry in loop failed */
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return retval;
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}
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static void __exit cleanup_slots(void)
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{
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struct list_head *tmp, *n;
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struct slot *slot;
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/*
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* Unregister all of our slots with the pci_hotplug subsystem,
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* and free up all memory that we had allocated.
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* memory will be freed in release_slot callback.
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*/
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list_for_each_safe(tmp, n, &rpaphp_slot_head) {
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slot = list_entry(tmp, struct slot, rpaphp_slot_list);
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list_del(&slot->rpaphp_slot_list);
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pci_hp_deregister(slot->hotplug_slot);
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}
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return;
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}
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static int __init rpaphp_init(void)
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{
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struct device_node *dn = NULL;
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info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
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while ((dn = of_find_node_by_name(dn, "pci")))
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rpaphp_add_slot(dn);
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return 0;
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}
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static void __exit rpaphp_exit(void)
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{
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cleanup_slots();
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}
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static int enable_slot(struct hotplug_slot *hotplug_slot)
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{
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struct slot *slot = (struct slot *)hotplug_slot->private;
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int state;
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int retval;
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if (slot->state == CONFIGURED)
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return 0;
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retval = rpaphp_get_sensor_state(slot, &state);
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if (retval)
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return retval;
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if (state == PRESENT) {
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pcibios_add_pci_devices(slot->bus);
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slot->state = CONFIGURED;
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} else if (state == EMPTY) {
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slot->state = EMPTY;
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} else {
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err("%s: slot[%s] is in invalid state\n", __func__, slot->name);
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slot->state = NOT_VALID;
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return -EINVAL;
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}
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slot->bus->max_bus_speed = get_max_bus_speed(slot);
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return 0;
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}
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static int disable_slot(struct hotplug_slot *hotplug_slot)
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{
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struct slot *slot = (struct slot *)hotplug_slot->private;
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if (slot->state == NOT_CONFIGURED)
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return -EINVAL;
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pcibios_remove_pci_devices(slot->bus);
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vm_unmap_aliases();
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slot->state = NOT_CONFIGURED;
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return 0;
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}
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struct hotplug_slot_ops rpaphp_hotplug_slot_ops = {
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.enable_slot = enable_slot,
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.disable_slot = disable_slot,
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.set_attention_status = set_attention_status,
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.get_power_status = get_power_status,
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.get_attention_status = get_attention_status,
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.get_adapter_status = get_adapter_status,
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};
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module_init(rpaphp_init);
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module_exit(rpaphp_exit);
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EXPORT_SYMBOL_GPL(rpaphp_add_slot);
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EXPORT_SYMBOL_GPL(rpaphp_slot_head);
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EXPORT_SYMBOL_GPL(rpaphp_get_drc_props);
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