![Kenji Kaneshige](/assets/img/avatar_default.png)
Current pciehp driver creates 'attention' and 'latch' files even if the controller doesn't support them. In this case, the contents of those files are meaningless and unpredictable. Those files should be created only if the controller has the corresponding capabilities. Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
430 lines
11 KiB
C
430 lines
11 KiB
C
/*
|
|
* PCI Express Hot Plug Controller Driver
|
|
*
|
|
* Copyright (C) 1995,2001 Compaq Computer Corporation
|
|
* Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
|
|
* Copyright (C) 2001 IBM Corp.
|
|
* Copyright (C) 2003-2004 Intel Corporation
|
|
*
|
|
* 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 <greg@kroah.com>, <kristen.c.accardi@intel.com>
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/types.h>
|
|
#include <linux/pci.h>
|
|
#include "pciehp.h"
|
|
#include <linux/interrupt.h>
|
|
#include <linux/time.h>
|
|
|
|
/* Global variables */
|
|
int pciehp_debug;
|
|
int pciehp_poll_mode;
|
|
int pciehp_poll_time;
|
|
int pciehp_force;
|
|
struct workqueue_struct *pciehp_wq;
|
|
|
|
#define DRIVER_VERSION "0.4"
|
|
#define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
|
|
#define DRIVER_DESC "PCI Express Hot Plug Controller Driver"
|
|
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_param(pciehp_debug, bool, 0644);
|
|
module_param(pciehp_poll_mode, bool, 0644);
|
|
module_param(pciehp_poll_time, int, 0644);
|
|
module_param(pciehp_force, bool, 0644);
|
|
MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
|
|
MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
|
|
MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
|
|
MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if _OSC and OSHP are missing");
|
|
|
|
#define PCIE_MODULE_NAME "pciehp"
|
|
|
|
static int set_attention_status (struct hotplug_slot *slot, u8 value);
|
|
static int enable_slot (struct hotplug_slot *slot);
|
|
static int disable_slot (struct hotplug_slot *slot);
|
|
static int get_power_status (struct hotplug_slot *slot, u8 *value);
|
|
static int get_attention_status (struct hotplug_slot *slot, u8 *value);
|
|
static int get_latch_status (struct hotplug_slot *slot, u8 *value);
|
|
static int get_adapter_status (struct hotplug_slot *slot, u8 *value);
|
|
static int get_max_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value);
|
|
static int get_cur_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value);
|
|
|
|
/**
|
|
* release_slot - free up the memory used by a slot
|
|
* @hotplug_slot: slot to free
|
|
*/
|
|
static void release_slot(struct hotplug_slot *hotplug_slot)
|
|
{
|
|
struct slot *slot = hotplug_slot->private;
|
|
|
|
ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
|
|
__func__, hotplug_slot_name(hotplug_slot));
|
|
|
|
kfree(hotplug_slot->ops);
|
|
kfree(hotplug_slot->info);
|
|
kfree(hotplug_slot);
|
|
}
|
|
|
|
static int init_slot(struct controller *ctrl)
|
|
{
|
|
struct slot *slot = ctrl->slot;
|
|
struct hotplug_slot *hotplug = NULL;
|
|
struct hotplug_slot_info *info = NULL;
|
|
struct hotplug_slot_ops *ops = NULL;
|
|
char name[SLOT_NAME_SIZE];
|
|
int retval = -ENOMEM;
|
|
|
|
hotplug = kzalloc(sizeof(*hotplug), GFP_KERNEL);
|
|
if (!hotplug)
|
|
goto out;
|
|
|
|
info = kzalloc(sizeof(*info), GFP_KERNEL);
|
|
if (!info)
|
|
goto out;
|
|
|
|
/* Setup hotplug slot ops */
|
|
ops = kzalloc(sizeof(*ops), GFP_KERNEL);
|
|
if (!ops)
|
|
goto out;
|
|
ops->enable_slot = enable_slot;
|
|
ops->disable_slot = disable_slot;
|
|
ops->get_power_status = get_power_status;
|
|
ops->get_adapter_status = get_adapter_status;
|
|
ops->get_max_bus_speed = get_max_bus_speed;
|
|
ops->get_cur_bus_speed = get_cur_bus_speed;
|
|
if (MRL_SENS(ctrl))
|
|
ops->get_latch_status = get_latch_status;
|
|
if (ATTN_LED(ctrl)) {
|
|
ops->get_attention_status = get_attention_status;
|
|
ops->set_attention_status = set_attention_status;
|
|
}
|
|
|
|
/* register this slot with the hotplug pci core */
|
|
hotplug->info = info;
|
|
hotplug->private = slot;
|
|
hotplug->release = &release_slot;
|
|
hotplug->ops = ops;
|
|
slot->hotplug_slot = hotplug;
|
|
snprintf(name, SLOT_NAME_SIZE, "%u", PSN(ctrl));
|
|
|
|
ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:00 sun=%x\n",
|
|
pci_domain_nr(ctrl->pcie->port->subordinate),
|
|
ctrl->pcie->port->subordinate->number, PSN(ctrl));
|
|
retval = pci_hp_register(hotplug,
|
|
ctrl->pcie->port->subordinate, 0, name);
|
|
if (retval) {
|
|
ctrl_err(ctrl,
|
|
"pci_hp_register failed with error %d\n", retval);
|
|
goto out;
|
|
}
|
|
get_power_status(hotplug, &info->power_status);
|
|
get_attention_status(hotplug, &info->attention_status);
|
|
get_latch_status(hotplug, &info->latch_status);
|
|
get_adapter_status(hotplug, &info->adapter_status);
|
|
out:
|
|
if (retval) {
|
|
kfree(ops);
|
|
kfree(info);
|
|
kfree(hotplug);
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
static void cleanup_slot(struct controller *ctrl)
|
|
{
|
|
pci_hp_deregister(ctrl->slot->hotplug_slot);
|
|
}
|
|
|
|
/*
|
|
* set_attention_status - Turns the Amber LED for a slot on, off or blink
|
|
*/
|
|
static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
|
|
{
|
|
struct slot *slot = hotplug_slot->private;
|
|
|
|
ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
|
|
__func__, slot_name(slot));
|
|
|
|
hotplug_slot->info->attention_status = status;
|
|
pciehp_set_attention_status(slot, status);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int enable_slot(struct hotplug_slot *hotplug_slot)
|
|
{
|
|
struct slot *slot = hotplug_slot->private;
|
|
|
|
ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
|
|
__func__, slot_name(slot));
|
|
|
|
return pciehp_sysfs_enable_slot(slot);
|
|
}
|
|
|
|
|
|
static int disable_slot(struct hotplug_slot *hotplug_slot)
|
|
{
|
|
struct slot *slot = hotplug_slot->private;
|
|
|
|
ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
|
|
__func__, slot_name(slot));
|
|
|
|
return pciehp_sysfs_disable_slot(slot);
|
|
}
|
|
|
|
static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
|
|
{
|
|
struct slot *slot = hotplug_slot->private;
|
|
int retval;
|
|
|
|
ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
|
|
__func__, slot_name(slot));
|
|
|
|
retval = pciehp_get_power_status(slot, value);
|
|
if (retval < 0)
|
|
*value = hotplug_slot->info->power_status;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
|
|
{
|
|
struct slot *slot = hotplug_slot->private;
|
|
int retval;
|
|
|
|
ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
|
|
__func__, slot_name(slot));
|
|
|
|
retval = pciehp_get_attention_status(slot, value);
|
|
if (retval < 0)
|
|
*value = hotplug_slot->info->attention_status;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
|
|
{
|
|
struct slot *slot = hotplug_slot->private;
|
|
int retval;
|
|
|
|
ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
|
|
__func__, slot_name(slot));
|
|
|
|
retval = pciehp_get_latch_status(slot, value);
|
|
if (retval < 0)
|
|
*value = hotplug_slot->info->latch_status;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
|
|
{
|
|
struct slot *slot = hotplug_slot->private;
|
|
int retval;
|
|
|
|
ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
|
|
__func__, slot_name(slot));
|
|
|
|
retval = pciehp_get_adapter_status(slot, value);
|
|
if (retval < 0)
|
|
*value = hotplug_slot->info->adapter_status;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int get_max_bus_speed(struct hotplug_slot *hotplug_slot,
|
|
enum pci_bus_speed *value)
|
|
{
|
|
struct slot *slot = hotplug_slot->private;
|
|
int retval;
|
|
|
|
ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
|
|
__func__, slot_name(slot));
|
|
|
|
retval = pciehp_get_max_link_speed(slot, value);
|
|
if (retval < 0)
|
|
*value = PCI_SPEED_UNKNOWN;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int get_cur_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
|
|
{
|
|
struct slot *slot = hotplug_slot->private;
|
|
int retval;
|
|
|
|
ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
|
|
__func__, slot_name(slot));
|
|
|
|
retval = pciehp_get_cur_link_speed(slot, value);
|
|
if (retval < 0)
|
|
*value = PCI_SPEED_UNKNOWN;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pciehp_probe(struct pcie_device *dev)
|
|
{
|
|
int rc;
|
|
struct controller *ctrl;
|
|
struct slot *slot;
|
|
u8 value;
|
|
struct pci_dev *pdev = dev->port;
|
|
|
|
if (pciehp_force)
|
|
dev_info(&dev->device,
|
|
"Bypassing BIOS check for pciehp use on %s\n",
|
|
pci_name(pdev));
|
|
else if (pciehp_get_hp_hw_control_from_firmware(pdev))
|
|
goto err_out_none;
|
|
|
|
ctrl = pcie_init(dev);
|
|
if (!ctrl) {
|
|
dev_err(&dev->device, "Controller initialization failed\n");
|
|
goto err_out_none;
|
|
}
|
|
set_service_data(dev, ctrl);
|
|
|
|
/* Setup the slot information structures */
|
|
rc = init_slot(ctrl);
|
|
if (rc) {
|
|
if (rc == -EBUSY)
|
|
ctrl_warn(ctrl, "Slot already registered by another "
|
|
"hotplug driver\n");
|
|
else
|
|
ctrl_err(ctrl, "Slot initialization failed\n");
|
|
goto err_out_release_ctlr;
|
|
}
|
|
|
|
/* Enable events after we have setup the data structures */
|
|
rc = pcie_init_notification(ctrl);
|
|
if (rc) {
|
|
ctrl_err(ctrl, "Notification initialization failed\n");
|
|
goto err_out_release_ctlr;
|
|
}
|
|
|
|
/* Check if slot is occupied */
|
|
slot = ctrl->slot;
|
|
pciehp_get_adapter_status(slot, &value);
|
|
if (value) {
|
|
if (pciehp_force)
|
|
pciehp_enable_slot(slot);
|
|
} else {
|
|
/* Power off slot if not occupied */
|
|
if (POWER_CTRL(ctrl)) {
|
|
rc = pciehp_power_off_slot(slot);
|
|
if (rc)
|
|
goto err_out_free_ctrl_slot;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_out_free_ctrl_slot:
|
|
cleanup_slot(ctrl);
|
|
err_out_release_ctlr:
|
|
pciehp_release_ctrl(ctrl);
|
|
err_out_none:
|
|
return -ENODEV;
|
|
}
|
|
|
|
static void pciehp_remove(struct pcie_device *dev)
|
|
{
|
|
struct controller *ctrl = get_service_data(dev);
|
|
|
|
cleanup_slot(ctrl);
|
|
pciehp_release_ctrl(ctrl);
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int pciehp_suspend (struct pcie_device *dev)
|
|
{
|
|
dev_info(&dev->device, "%s ENTRY\n", __func__);
|
|
return 0;
|
|
}
|
|
|
|
static int pciehp_resume (struct pcie_device *dev)
|
|
{
|
|
dev_info(&dev->device, "%s ENTRY\n", __func__);
|
|
if (pciehp_force) {
|
|
struct controller *ctrl = get_service_data(dev);
|
|
struct slot *slot;
|
|
u8 status;
|
|
|
|
/* reinitialize the chipset's event detection logic */
|
|
pcie_enable_notification(ctrl);
|
|
|
|
slot = ctrl->slot;
|
|
|
|
/* Check if slot is occupied */
|
|
pciehp_get_adapter_status(slot, &status);
|
|
if (status)
|
|
pciehp_enable_slot(slot);
|
|
else
|
|
pciehp_disable_slot(slot);
|
|
}
|
|
return 0;
|
|
}
|
|
#endif /* PM */
|
|
|
|
static struct pcie_port_service_driver hpdriver_portdrv = {
|
|
.name = PCIE_MODULE_NAME,
|
|
.port_type = PCIE_ANY_PORT,
|
|
.service = PCIE_PORT_SERVICE_HP,
|
|
|
|
.probe = pciehp_probe,
|
|
.remove = pciehp_remove,
|
|
|
|
#ifdef CONFIG_PM
|
|
.suspend = pciehp_suspend,
|
|
.resume = pciehp_resume,
|
|
#endif /* PM */
|
|
};
|
|
|
|
static int __init pcied_init(void)
|
|
{
|
|
int retval = 0;
|
|
|
|
pciehp_firmware_init();
|
|
retval = pcie_port_service_register(&hpdriver_portdrv);
|
|
dbg("pcie_port_service_register = %d\n", retval);
|
|
info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
|
|
if (retval)
|
|
dbg("Failure to register service\n");
|
|
return retval;
|
|
}
|
|
|
|
static void __exit pcied_cleanup(void)
|
|
{
|
|
dbg("unload_pciehpd()\n");
|
|
pcie_port_service_unregister(&hpdriver_portdrv);
|
|
info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
|
|
}
|
|
|
|
module_init(pcied_init);
|
|
module_exit(pcied_cleanup);
|