From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/drivers/pci/hotplug/rpaphp_core.c | 448 +++++++++++++++++++++++++++++++ 1 file changed, 448 insertions(+) create mode 100644 kernel/drivers/pci/hotplug/rpaphp_core.c (limited to 'kernel/drivers/pci/hotplug/rpaphp_core.c') diff --git a/kernel/drivers/pci/hotplug/rpaphp_core.c b/kernel/drivers/pci/hotplug/rpaphp_core.c new file mode 100644 index 000000000..f2945fa73 --- /dev/null +++ b/kernel/drivers/pci/hotplug/rpaphp_core.c @@ -0,0 +1,448 @@ +/* + * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform. + * Copyright (C) 2003 Linda Xie + * + * All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or (at + * your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for more + * details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * + * Send feedback to + * + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include /* for eeh_add_device() */ +#include /* rtas_call */ +#include /* for pci_controller */ +#include "../pci.h" /* for pci_add_new_bus */ + /* and pci_do_scan_bus */ +#include "rpaphp.h" + +bool rpaphp_debug; +LIST_HEAD(rpaphp_slot_head); +EXPORT_SYMBOL_GPL(rpaphp_slot_head); + +#define DRIVER_VERSION "0.1" +#define DRIVER_AUTHOR "Linda Xie " +#define DRIVER_DESC "RPA HOT Plug PCI Controller Driver" + +#define MAX_LOC_CODE 128 + +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); + +module_param_named(debug, rpaphp_debug, bool, 0644); + +/** + * set_attention_status - set attention LED + * @hotplug_slot: target &hotplug_slot + * @value: LED control value + * + * echo 0 > attention -- set LED OFF + * echo 1 > attention -- set LED ON + * echo 2 > attention -- set LED ID(identify, light is blinking) + */ +static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value) +{ + int rc; + struct slot *slot = (struct slot *)hotplug_slot->private; + + switch (value) { + case 0: + case 1: + case 2: + break; + default: + value = 1; + break; + } + + rc = rtas_set_indicator(DR_INDICATOR, slot->index, value); + if (!rc) + hotplug_slot->info->attention_status = value; + + return rc; +} + +/** + * get_power_status - get power status of a slot + * @hotplug_slot: slot to get status + * @value: pointer to store status + */ +static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) +{ + int retval, level; + struct slot *slot = (struct slot *)hotplug_slot->private; + + retval = rtas_get_power_level (slot->power_domain, &level); + if (!retval) + *value = level; + return retval; +} + +/** + * get_attention_status - get attention LED status + * @hotplug_slot: slot to get status + * @value: pointer to store status + */ +static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value) +{ + struct slot *slot = (struct slot *)hotplug_slot->private; + *value = slot->hotplug_slot->info->attention_status; + return 0; +} + +static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) +{ + struct slot *slot = (struct slot *)hotplug_slot->private; + int rc, state; + + rc = rpaphp_get_sensor_state(slot, &state); + + *value = NOT_VALID; + if (rc) + return rc; + + if (state == EMPTY) + *value = EMPTY; + else if (state == PRESENT) + *value = slot->state; + + return 0; +} + +static enum pci_bus_speed get_max_bus_speed(struct slot *slot) +{ + enum pci_bus_speed speed; + switch (slot->type) { + case 1: + case 2: + case 3: + case 4: + case 5: + case 6: + speed = PCI_SPEED_33MHz; /* speed for case 1-6 */ + break; + case 7: + case 8: + speed = PCI_SPEED_66MHz; + break; + case 11: + case 14: + speed = PCI_SPEED_66MHz_PCIX; + break; + case 12: + case 15: + speed = PCI_SPEED_100MHz_PCIX; + break; + case 13: + case 16: + speed = PCI_SPEED_133MHz_PCIX; + break; + default: + speed = PCI_SPEED_UNKNOWN; + break; + } + + return speed; +} + +static int get_children_props(struct device_node *dn, const int **drc_indexes, + const int **drc_names, const int **drc_types, + const int **drc_power_domains) +{ + const int *indexes, *names, *types, *domains; + + indexes = of_get_property(dn, "ibm,drc-indexes", NULL); + names = of_get_property(dn, "ibm,drc-names", NULL); + types = of_get_property(dn, "ibm,drc-types", NULL); + domains = of_get_property(dn, "ibm,drc-power-domains", NULL); + + if (!indexes || !names || !types || !domains) { + /* Slot does not have dynamically-removable children */ + return -EINVAL; + } + if (drc_indexes) + *drc_indexes = indexes; + if (drc_names) + /* &drc_names[1] contains NULL terminated slot names */ + *drc_names = names; + if (drc_types) + /* &drc_types[1] contains NULL terminated slot types */ + *drc_types = types; + if (drc_power_domains) + *drc_power_domains = domains; + + return 0; +} + +/* To get the DRC props describing the current node, first obtain it's + * my-drc-index property. Next obtain the DRC list from it's parent. Use + * the my-drc-index for correlation, and obtain the requested properties. + */ +int rpaphp_get_drc_props(struct device_node *dn, int *drc_index, + char **drc_name, char **drc_type, int *drc_power_domain) +{ + const int *indexes, *names; + const int *types, *domains; + const unsigned int *my_index; + char *name_tmp, *type_tmp; + int i, rc; + + my_index = of_get_property(dn, "ibm,my-drc-index", NULL); + if (!my_index) { + /* Node isn't DLPAR/hotplug capable */ + return -EINVAL; + } + + rc = get_children_props(dn->parent, &indexes, &names, &types, &domains); + if (rc < 0) { + return -EINVAL; + } + + name_tmp = (char *) &names[1]; + type_tmp = (char *) &types[1]; + + /* Iterate through parent properties, looking for my-drc-index */ + for (i = 0; i < be32_to_cpu(indexes[0]); i++) { + if ((unsigned int) indexes[i + 1] == *my_index) { + if (drc_name) + *drc_name = name_tmp; + if (drc_type) + *drc_type = type_tmp; + if (drc_index) + *drc_index = be32_to_cpu(*my_index); + if (drc_power_domain) + *drc_power_domain = be32_to_cpu(domains[i+1]); + return 0; + } + name_tmp += (strlen(name_tmp) + 1); + type_tmp += (strlen(type_tmp) + 1); + } + + return -EINVAL; +} +EXPORT_SYMBOL_GPL(rpaphp_get_drc_props); + +static int is_php_type(char *drc_type) +{ + unsigned long value; + char *endptr; + + /* PCI Hotplug nodes have an integer for drc_type */ + value = simple_strtoul(drc_type, &endptr, 10); + if (endptr == drc_type) + return 0; + + return 1; +} + +/** + * is_php_dn() - return 1 if this is a hotpluggable pci slot, else 0 + * @dn: target &device_node + * @indexes: passed to get_children_props() + * @names: passed to get_children_props() + * @types: returned from get_children_props() + * @power_domains: + * + * This routine will return true only if the device node is + * a hotpluggable slot. This routine will return false + * for built-in pci slots (even when the built-in slots are + * dlparable.) + */ +static int is_php_dn(struct device_node *dn, const int **indexes, + const int **names, const int **types, const int **power_domains) +{ + const int *drc_types; + int rc; + + rc = get_children_props(dn, indexes, names, &drc_types, power_domains); + if (rc < 0) + return 0; + + if (!is_php_type((char *) &drc_types[1])) + return 0; + + *types = drc_types; + return 1; +} + +/** + * rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem. + * @dn: device node of slot + * + * This subroutine will register a hotpluggable slot with the + * PCI hotplug infrastructure. This routine is typically called + * during boot time, if the hotplug slots are present at boot time, + * or is called later, by the dlpar add code, if the slot is + * being dynamically added during runtime. + * + * If the device node points at an embedded (built-in) slot, this + * routine will just return without doing anything, since embedded + * slots cannot be hotplugged. + * + * To remove a slot, it suffices to call rpaphp_deregister_slot(). + */ +int rpaphp_add_slot(struct device_node *dn) +{ + struct slot *slot; + int retval = 0; + int i; + const int *indexes, *names, *types, *power_domains; + char *name, *type; + + if (!dn->name || strcmp(dn->name, "pci")) + return 0; + + /* If this is not a hotplug slot, return without doing anything. */ + if (!is_php_dn(dn, &indexes, &names, &types, &power_domains)) + return 0; + + dbg("Entry %s: dn->full_name=%s\n", __func__, dn->full_name); + + /* register PCI devices */ + name = (char *) &names[1]; + type = (char *) &types[1]; + for (i = 0; i < be32_to_cpu(indexes[0]); i++) { + int index; + + index = be32_to_cpu(indexes[i + 1]); + slot = alloc_slot_struct(dn, index, name, + be32_to_cpu(power_domains[i + 1])); + if (!slot) + return -ENOMEM; + + slot->type = simple_strtoul(type, NULL, 10); + + dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n", + index, name, type); + + retval = rpaphp_enable_slot(slot); + if (!retval) + retval = rpaphp_register_slot(slot); + + if (retval) + dealloc_slot_struct(slot); + + name += strlen(name) + 1; + type += strlen(type) + 1; + } + dbg("%s - Exit: rc[%d]\n", __func__, retval); + + /* XXX FIXME: reports a failure only if last entry in loop failed */ + return retval; +} +EXPORT_SYMBOL_GPL(rpaphp_add_slot); + +static void __exit cleanup_slots(void) +{ + struct list_head *tmp, *n; + struct slot *slot; + + /* + * Unregister all of our slots with the pci_hotplug subsystem, + * and free up all memory that we had allocated. + * memory will be freed in release_slot callback. + */ + + list_for_each_safe(tmp, n, &rpaphp_slot_head) { + slot = list_entry(tmp, struct slot, rpaphp_slot_list); + list_del(&slot->rpaphp_slot_list); + pci_hp_deregister(slot->hotplug_slot); + } + return; +} + +static int __init rpaphp_init(void) +{ + struct device_node *dn; + + info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); + + for_each_node_by_name(dn, "pci") + rpaphp_add_slot(dn); + + return 0; +} + +static void __exit rpaphp_exit(void) +{ + cleanup_slots(); +} + +static int enable_slot(struct hotplug_slot *hotplug_slot) +{ + struct slot *slot = (struct slot *)hotplug_slot->private; + int state; + int retval; + + if (slot->state == CONFIGURED) + return 0; + + retval = rpaphp_get_sensor_state(slot, &state); + if (retval) + return retval; + + if (state == PRESENT) { + pci_lock_rescan_remove(); + pcibios_add_pci_devices(slot->bus); + pci_unlock_rescan_remove(); + slot->state = CONFIGURED; + } else if (state == EMPTY) { + slot->state = EMPTY; + } else { + err("%s: slot[%s] is in invalid state\n", __func__, slot->name); + slot->state = NOT_VALID; + return -EINVAL; + } + + slot->bus->max_bus_speed = get_max_bus_speed(slot); + return 0; +} + +static int disable_slot(struct hotplug_slot *hotplug_slot) +{ + struct slot *slot = (struct slot *)hotplug_slot->private; + if (slot->state == NOT_CONFIGURED) + return -EINVAL; + + pci_lock_rescan_remove(); + pcibios_remove_pci_devices(slot->bus); + pci_unlock_rescan_remove(); + vm_unmap_aliases(); + + slot->state = NOT_CONFIGURED; + return 0; +} + +struct hotplug_slot_ops rpaphp_hotplug_slot_ops = { + .enable_slot = enable_slot, + .disable_slot = disable_slot, + .set_attention_status = set_attention_status, + .get_power_status = get_power_status, + .get_attention_status = get_attention_status, + .get_adapter_status = get_adapter_status, +}; + +module_init(rpaphp_init); +module_exit(rpaphp_exit); -- cgit 1.2.3-korg