--- /dev/null
+/*
+ * 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/slab.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+#include "pciehp.h"
+#include <linux/interrupt.h>
+#include <linux/time.h>
+
+/* Global variables */
+bool pciehp_debug;
+bool pciehp_poll_mode;
+int pciehp_poll_time;
+static bool pciehp_force;
+
+#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 OSHP is 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 reset_slot (struct hotplug_slot *slot, int probe);
+
+/**
+ * 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->reset_slot = reset_slot;
+ 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);
+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));
+
+ 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;
+
+ ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
+ __func__, slot_name(slot));
+
+ pciehp_get_power_status(slot, value);
+ return 0;
+}
+
+static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
+{
+ struct slot *slot = hotplug_slot->private;
+
+ ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
+ __func__, slot_name(slot));
+
+ pciehp_get_attention_status(slot, value);
+ return 0;
+}
+
+static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
+{
+ struct slot *slot = hotplug_slot->private;
+
+ ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
+ __func__, slot_name(slot));
+
+ pciehp_get_latch_status(slot, value);
+ return 0;
+}
+
+static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
+{
+ struct slot *slot = hotplug_slot->private;
+
+ ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
+ __func__, slot_name(slot));
+
+ pciehp_get_adapter_status(slot, value);
+ return 0;
+}
+
+static int reset_slot(struct hotplug_slot *hotplug_slot, int probe)
+{
+ struct slot *slot = hotplug_slot->private;
+
+ ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
+ __func__, slot_name(slot));
+
+ return pciehp_reset_slot(slot, probe);
+}
+
+static int pciehp_probe(struct pcie_device *dev)
+{
+ int rc;
+ struct controller *ctrl;
+ struct slot *slot;
+ u8 occupied, poweron;
+
+ if (pciehp_force)
+ dev_info(&dev->device,
+ "Bypassing BIOS check for pciehp use on %s\n",
+ pci_name(dev->port));
+ else if (pciehp_acpi_slot_detection_check(dev->port))
+ goto err_out_none;
+
+ if (!dev->port->subordinate) {
+ /* Can happen if we run out of bus numbers during probe */
+ dev_err(&dev->device,
+ "Hotplug bridge without secondary bus, ignoring\n");
+ 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_free_ctrl_slot;
+ }
+
+ /* Check if slot is occupied */
+ slot = ctrl->slot;
+ pciehp_get_adapter_status(slot, &occupied);
+ pciehp_get_power_status(slot, &poweron);
+ if (occupied && pciehp_force) {
+ mutex_lock(&slot->hotplug_lock);
+ pciehp_enable_slot(slot);
+ mutex_unlock(&slot->hotplug_lock);
+ }
+ /* If empty slot's power status is on, turn power off */
+ if (!occupied && poweron && POWER_CTRL(ctrl))
+ pciehp_power_off_slot(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)
+{
+ return 0;
+}
+
+static int pciehp_resume(struct pcie_device *dev)
+{
+ struct controller *ctrl;
+ struct slot *slot;
+ u8 status;
+
+ ctrl = get_service_data(dev);
+
+ /* 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);
+ mutex_lock(&slot->hotplug_lock);
+ if (status)
+ pciehp_enable_slot(slot);
+ else
+ pciehp_disable_slot(slot);
+ mutex_unlock(&slot->hotplug_lock);
+ 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);
Code Review / kvmfornfv.git / blobdiff