Contributors: 25
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Linda Xie |
734 |
39.15% |
3 |
6.00% |
| Michael Bringmann |
338 |
18.03% |
1 |
2.00% |
| John Rose |
324 |
17.28% |
5 |
10.00% |
| Linas Vepstas |
311 |
16.59% |
15 |
30.00% |
| Lukas Wunner |
27 |
1.44% |
4 |
8.00% |
| Laurent Dufour |
26 |
1.39% |
1 |
2.00% |
| Matthew Wilcox |
25 |
1.33% |
1 |
2.00% |
| Ryan Desfosses |
14 |
0.75% |
1 |
2.00% |
| Jeremy Kerr |
14 |
0.75% |
1 |
2.00% |
| Rafael J. Wysocki |
12 |
0.64% |
1 |
2.00% |
| Geliang Tang |
8 |
0.43% |
1 |
2.00% |
| Benjamin Herrenschmidt |
6 |
0.32% |
1 |
2.00% |
| Stephen Rothwell |
4 |
0.21% |
1 |
2.00% |
| Paul Mackerras |
4 |
0.21% |
1 |
2.00% |
| Kristen Carlson Accardi |
4 |
0.21% |
1 |
2.00% |
| Andrew Morton |
4 |
0.21% |
1 |
2.00% |
| Greg Kroah-Hartman |
3 |
0.16% |
1 |
2.00% |
| Harvey Harrison |
3 |
0.16% |
1 |
2.00% |
| Björn Helgaas |
3 |
0.16% |
2 |
4.00% |
| Randy Dunlap |
3 |
0.16% |
1 |
2.00% |
| Rolf Eike Beer |
2 |
0.11% |
2 |
4.00% |
| Gavin Shan |
2 |
0.11% |
1 |
2.00% |
| Grant C. Likely |
2 |
0.11% |
1 |
2.00% |
| Rusty Russell |
1 |
0.05% |
1 |
2.00% |
| Rob Herring |
1 |
0.05% |
1 |
2.00% |
| Total |
1875 |
|
50 |
|
// SPDX-License-Identifier: GPL-2.0+
/*
* PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
* Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
*
* All rights reserved.
*
* Send feedback to <lxie@us.ibm.com>
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <linux/smp.h>
#include <linux/init.h>
#include <linux/vmalloc.h>
#include <asm/firmware.h>
#include <asm/eeh.h> /* for eeh_add_device() */
#include <asm/rtas.h> /* rtas_call */
#include <asm/pci-bridge.h> /* 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 <lxie@us.ibm.com>"
#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 = to_slot(hotplug_slot);
switch (value) {
case 0:
case 1:
case 2:
break;
default:
value = 1;
break;
}
rc = rtas_set_indicator(DR_INDICATOR, slot->index, value);
if (!rc)
slot->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 = to_slot(hotplug_slot);
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 = to_slot(hotplug_slot);
*value = slot->attention_status;
return 0;
}
static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
struct slot *slot = to_slot(hotplug_slot);
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;
}
/* Verify the existence of 'drc_name' and/or 'drc_type' within the
* current node. First obtain it's my-drc-index property. Next,
* obtain the DRC info from it's parent. Use the my-drc-index for
* correlation, and obtain/validate the requested properties.
*/
static int rpaphp_check_drc_props_v1(struct device_node *dn, char *drc_name,
char *drc_type, unsigned int my_index)
{
char *name_tmp, *type_tmp;
const int *indexes, *names;
const int *types, *domains;
int i, rc;
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)
break;
name_tmp += (strlen(name_tmp) + 1);
type_tmp += (strlen(type_tmp) + 1);
}
if (((drc_name == NULL) || (drc_name && !strcmp(drc_name, name_tmp))) &&
((drc_type == NULL) || (drc_type && !strcmp(drc_type, type_tmp))))
return 0;
return -EINVAL;
}
static int rpaphp_check_drc_props_v2(struct device_node *dn, char *drc_name,
char *drc_type, unsigned int my_index)
{
struct property *info;
unsigned int entries;
struct of_drc_info drc;
const __be32 *value;
char cell_drc_name[MAX_DRC_NAME_LEN];
int j, fndit;
info = of_find_property(dn->parent, "ibm,drc-info", NULL);
if (info == NULL)
return -EINVAL;
value = of_prop_next_u32(info, NULL, &entries);
if (!value)
return -EINVAL;
for (j = 0; j < entries; j++) {
of_read_drc_info_cell(&info, &value, &drc);
/* Should now know end of current entry */
if (my_index > drc.last_drc_index)
continue;
fndit = 1;
break;
}
/* Found it */
if (fndit)
sprintf(cell_drc_name, "%s%d", drc.drc_name_prefix,
my_index);
if (((drc_name == NULL) ||
(drc_name && !strcmp(drc_name, cell_drc_name))) &&
((drc_type == NULL) ||
(drc_type && !strcmp(drc_type, drc.drc_type))))
return 0;
return -EINVAL;
}
int rpaphp_check_drc_props(struct device_node *dn, char *drc_name,
char *drc_type)
{
const unsigned int *my_index;
my_index = of_get_property(dn, "ibm,my-drc-index", NULL);
if (!my_index) {
/* Node isn't DLPAR/hotplug capable */
return -EINVAL;
}
if (firmware_has_feature(FW_FEATURE_DRC_INFO))
return rpaphp_check_drc_props_v2(dn, drc_name, drc_type,
*my_index);
else
return rpaphp_check_drc_props_v1(dn, drc_name, drc_type,
*my_index);
}
EXPORT_SYMBOL_GPL(rpaphp_check_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=%pOF\n", __func__, dn);
/* 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 slot *slot, *next;
/*
* Unregister all of our slots with the pci_hotplug subsystem,
* and free up all memory that we had allocated.
*/
list_for_each_entry_safe(slot, next, &rpaphp_slot_head,
rpaphp_slot_list) {
list_del(&slot->rpaphp_slot_list);
pci_hp_deregister(&slot->hotplug_slot);
dealloc_slot_struct(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 = to_slot(hotplug_slot);
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();
pci_hp_add_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 = to_slot(hotplug_slot);
if (slot->state == NOT_CONFIGURED)
return -EINVAL;
pci_lock_rescan_remove();
pci_hp_remove_devices(slot->bus);
pci_unlock_rescan_remove();
vm_unmap_aliases();
slot->state = NOT_CONFIGURED;
return 0;
}
const 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);