1 files changed, 219 insertions, 194 deletions

diff --git a/drivers/pci/hotplug/pciehp_core.c b/drivers/pci/hotplug/pciehp_core.c
index 7d72c5e2eba9..f59baa912970 100644
--- a/drivers/pci/hotplug/pciehp_core.c
+++ b/drivers/pci/hotplug/pciehp_core.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * PCI Express Hot Plug Controller Driver
  *
@@ -8,239 +9,198 @@
  *
  * 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>
  *
+ * Authors:
+ *   Dan Zink <dan.zink@compaq.com>
+ *   Greg Kroah-Hartman <greg@kroah.com>
+ *   Dely Sy <dely.l.sy@intel.com>"
  */
 
-#include <linux/module.h>
+#define pr_fmt(fmt) "pciehp: " fmt
+#define dev_fmt pr_fmt
+
+#include <linux/bitfield.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>
+
+#include "../pci.h"
 
 /* Global variables */
-bool pciehp_debug;
 bool pciehp_poll_mode;
 int pciehp_poll_time;
-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);
+/*
+ * not really modular, but the easiest way to keep compat with existing
+ * bootargs behaviour is to continue using module_param here.
+ */
 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);
-
-/**
- * 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 set_attention_status(struct hotplug_slot *slot, u8 value);
+static int get_power_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 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;
+	struct hotplug_slot_ops *ops;
 	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;
+	int retval;
 
 	/* Setup hotplug slot ops */
 	ops = kzalloc(sizeof(*ops), GFP_KERNEL);
 	if (!ops)
-		goto out;
-	ops->enable_slot = enable_slot;
-	ops->disable_slot = disable_slot;
+		return -ENOMEM;
+
+	ops->enable_slot = pciehp_sysfs_enable_slot;
+	ops->disable_slot = pciehp_sysfs_disable_slot;
 	ops->get_power_status = get_power_status;
 	ops->get_adapter_status = get_adapter_status;
+	ops->reset_slot = pciehp_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->get_attention_status = pciehp_get_attention_status;
 		ops->set_attention_status = set_attention_status;
+	} else if (ctrl->pcie->port->hotplug_user_indicators) {
+		ops->get_attention_status = pciehp_get_raw_indicator_status;
+		ops->set_attention_status = pciehp_set_raw_indicator_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;
+	ctrl->hotplug_slot.ops = ops;
 	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:
+	retval = pci_hp_initialize(&ctrl->hotplug_slot,
+				   ctrl->pcie->port->subordinate, 0, name);
 	if (retval) {
+		ctrl_err(ctrl, "pci_hp_initialize failed: error %d\n", retval);
 		kfree(ops);
-		kfree(info);
-		kfree(hotplug);
 	}
 	return retval;
 }
 
 static void cleanup_slot(struct controller *ctrl)
 {
-	pci_hp_deregister(ctrl->slot->hotplug_slot);
+	struct hotplug_slot *hotplug_slot = &ctrl->hotplug_slot;
+
+	pci_hp_destroy(hotplug_slot);
+	kfree(hotplug_slot->ops);
 }
 
 /*
- * set_attention_status - Turns the Amber LED for a slot on, off or blink
+ * set_attention_status - Turns the Attention Indicator on, off or blinking
  */
 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));
-
-	return pciehp_set_attention_status(slot, status);
-}
-
-
-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);
-}
-
+	struct controller *ctrl = to_ctrl(hotplug_slot);
+	struct pci_dev *pdev = ctrl->pcie->port;
 
-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));
+	if (status)
+		status = FIELD_PREP(PCI_EXP_SLTCTL_AIC, status);
+	else
+		status = PCI_EXP_SLTCTL_ATTN_IND_OFF;
 
-	return pciehp_sysfs_disable_slot(slot);
+	pci_config_pm_runtime_get(pdev);
+	pciehp_set_indicators(ctrl, INDICATOR_NOOP, status);
+	pci_config_pm_runtime_put(pdev);
+	return 0;
 }
 
 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));
+	struct controller *ctrl = to_ctrl(hotplug_slot);
+	struct pci_dev *pdev = ctrl->pcie->port;
 
-	return pciehp_get_power_status(slot, value);
+	pci_config_pm_runtime_get(pdev);
+	pciehp_get_power_status(ctrl, value);
+	pci_config_pm_runtime_put(pdev);
+	return 0;
 }
 
-static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
+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));
+	struct controller *ctrl = to_ctrl(hotplug_slot);
+	struct pci_dev *pdev = ctrl->pcie->port;
 
-	return pciehp_get_attention_status(slot, value);
+	pci_config_pm_runtime_get(pdev);
+	pciehp_get_latch_status(ctrl, value);
+	pci_config_pm_runtime_put(pdev);
+	return 0;
 }
 
-static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
+static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
 {
-	struct slot *slot = hotplug_slot->private;
+	struct controller *ctrl = to_ctrl(hotplug_slot);
+	struct pci_dev *pdev = ctrl->pcie->port;
+	int ret;
 
-	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
-		 __func__, slot_name(slot));
+	pci_config_pm_runtime_get(pdev);
+	ret = pciehp_card_present_or_link_active(ctrl);
+	pci_config_pm_runtime_put(pdev);
+	if (ret < 0)
+		return ret;
 
-	return pciehp_get_latch_status(slot, value);
+	*value = ret;
+	return 0;
 }
 
-static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
+/**
+ * pciehp_check_presence() - synthesize event if presence has changed
+ * @ctrl: controller to check
+ *
+ * On probe and resume, an explicit presence check is necessary to bring up an
+ * occupied slot or bring down an unoccupied slot.  This can't be triggered by
+ * events in the Slot Status register, they may be stale and are therefore
+ * cleared.  Secondly, sending an interrupt for "events that occur while
+ * interrupt generation is disabled [when] interrupt generation is subsequently
+ * enabled" is optional per PCIe r4.0, sec 6.7.3.4.
+ */
+static void pciehp_check_presence(struct controller *ctrl)
 {
-	struct slot *slot = hotplug_slot->private;
+	int occupied;
+
+	down_read_nested(&ctrl->reset_lock, ctrl->depth);
+	mutex_lock(&ctrl->state_lock);
 
-	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
-		 __func__, slot_name(slot));
+	occupied = pciehp_card_present_or_link_active(ctrl);
+	if ((occupied > 0 && (ctrl->state == OFF_STATE ||
+			  ctrl->state == BLINKINGON_STATE)) ||
+	    (!occupied && (ctrl->state == ON_STATE ||
+			   ctrl->state == BLINKINGOFF_STATE)))
+		pciehp_request(ctrl, PCI_EXP_SLTSTA_PDC);
 
-	return pciehp_get_adapter_status(slot, value);
+	mutex_unlock(&ctrl->state_lock);
+	up_read(&ctrl->reset_lock);
 }
 
 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 this is not a "hotplug" service, we have no business here. */
+	if (dev->service != PCIE_PORT_SERVICE_HP)
+		return -ENODEV;
+
+	if (!dev->port->subordinate) {
+		/* Can happen if we run out of bus numbers during probe */
+		pci_err(dev->port,
+			"Hotplug bridge without secondary bus, ignoring\n");
+		return -ENODEV;
+	}
 
 	ctrl = pcie_init(dev);
 	if (!ctrl) {
-		dev_err(&dev->device, "Controller initialization failed\n");
-		goto err_out_none;
+		pci_err(dev->port, "Controller initialization failed\n");
+		return -ENODEV;
 	}
 	set_service_data(dev, ctrl);
 
@@ -248,37 +208,36 @@ static int pciehp_probe(struct pcie_device *dev)
 	rc = init_slot(ctrl);
 	if (rc) {
 		if (rc == -EBUSY)
-			ctrl_warn(ctrl, "Slot already registered by another "
-				  "hotplug driver\n");
+			ctrl_warn(ctrl, "Slot already registered by another hotplug driver\n");
 		else
-			ctrl_err(ctrl, "Slot initialization failed\n");
+			ctrl_err(ctrl, "Slot initialization failed (%d)\n", rc);
 		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");
+		ctrl_err(ctrl, "Notification initialization failed (%d)\n", rc);
 		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)
-		pciehp_enable_slot(slot);
-	/* If empty slot's power status is on, turn power off */
-	if (!occupied && poweron && POWER_CTRL(ctrl))
-		pciehp_power_off_slot(slot);
+	/* Publish to user space */
+	rc = pci_hp_add(&ctrl->hotplug_slot);
+	if (rc) {
+		ctrl_err(ctrl, "Publication to user space failed (%d)\n", rc);
+		goto err_out_shutdown_notification;
+	}
+
+	pciehp_check_presence(ctrl);
 
 	return 0;
 
+err_out_shutdown_notification:
+	pcie_shutdown_notification(ctrl);
 err_out_free_ctrl_slot:
 	cleanup_slot(ctrl);
 err_out_release_ctlr:
 	pciehp_release_ctrl(ctrl);
-err_out_none:
 	return -ENODEV;
 }
 
@@ -286,41 +245,112 @@ static void pciehp_remove(struct pcie_device *dev)
 {
 	struct controller *ctrl = get_service_data(dev);
 
+	pci_hp_del(&ctrl->hotplug_slot);
+	pcie_shutdown_notification(ctrl);
 	cleanup_slot(ctrl);
 	pciehp_release_ctrl(ctrl);
 }
 
 #ifdef CONFIG_PM
-static int pciehp_suspend (struct pcie_device *dev)
+static bool pme_is_native(struct pcie_device *dev)
 {
+	const struct pci_host_bridge *host;
+
+	host = pci_find_host_bridge(dev->port->bus);
+	return pcie_ports_native || host->native_pme;
+}
+
+static void pciehp_disable_interrupt(struct pcie_device *dev)
+{
+	/*
+	 * Disable hotplug interrupt so that it does not trigger
+	 * immediately when the downstream link goes down.
+	 */
+	if (pme_is_native(dev))
+		pcie_disable_interrupt(get_service_data(dev));
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int pciehp_suspend(struct pcie_device *dev)
+{
+	/*
+	 * If the port is already runtime suspended we can keep it that
+	 * way.
+	 */
+	if (dev_pm_skip_suspend(&dev->port->dev))
+		return 0;
+
+	pciehp_disable_interrupt(dev);
 	return 0;
 }
 
-static int pciehp_resume (struct pcie_device *dev)
+static int pciehp_resume_noirq(struct pcie_device *dev)
 {
-	struct controller *ctrl;
-	struct slot *slot;
-	u8 status;
+	struct controller *ctrl = get_service_data(dev);
 
-	ctrl = get_service_data(dev);
+	/* pci_restore_state() just wrote to the Slot Control register */
+	ctrl->cmd_started = jiffies;
+	ctrl->cmd_busy = true;
+
+	/* clear spurious events from rediscovery of inserted card */
+	if (ctrl->state == ON_STATE || ctrl->state == BLINKINGOFF_STATE) {
+		pcie_clear_hotplug_events(ctrl);
+
+		/*
+		 * If hotplugged device was replaced with a different one
+		 * during system sleep, mark the old device disconnected
+		 * (to prevent its driver from accessing the new device)
+		 * and synthesize a Presence Detect Changed event.
+		 */
+		if (pciehp_device_replaced(ctrl)) {
+			ctrl_dbg(ctrl, "device replaced during system sleep\n");
+			pci_walk_bus(ctrl->pcie->port->subordinate,
+				     pci_dev_set_disconnected, NULL);
+			pciehp_request(ctrl, PCI_EXP_SLTSTA_PDC);
+		}
+	}
 
-	/* reinitialize the chipset's event detection logic */
-	pcie_enable_notification(ctrl);
+	return 0;
+}
+#endif
 
-	slot = ctrl->slot;
+static int pciehp_resume(struct pcie_device *dev)
+{
+	struct controller *ctrl = get_service_data(dev);
+
+	if (pme_is_native(dev))
+		pcie_enable_interrupt(ctrl);
+
+	pciehp_check_presence(ctrl);
 
-	/* Check if slot is occupied */
-	pciehp_get_adapter_status(slot, &status);
-	if (status)
-		pciehp_enable_slot(slot);
-	else
-		pciehp_disable_slot(slot);
 	return 0;
 }
+
+static int pciehp_runtime_suspend(struct pcie_device *dev)
+{
+	pciehp_disable_interrupt(dev);
+	return 0;
+}
+
+static int pciehp_runtime_resume(struct pcie_device *dev)
+{
+	struct controller *ctrl = get_service_data(dev);
+
+	/* pci_restore_state() just wrote to the Slot Control register */
+	ctrl->cmd_started = jiffies;
+	ctrl->cmd_busy = true;
+
+	/* clear spurious events from rediscovery of inserted card */
+	if ((ctrl->state == ON_STATE || ctrl->state == BLINKINGOFF_STATE) &&
+	     pme_is_native(dev))
+		pcie_clear_hotplug_events(ctrl);
+
+	return pciehp_resume(dev);
+}
 #endif /* PM */
 
 static struct pcie_port_service_driver hpdriver_portdrv = {
-	.name		= PCIE_MODULE_NAME,
+	.name		= "pciehp",
 	.port_type	= PCIE_ANY_PORT,
 	.service	= PCIE_PORT_SERVICE_HP,
 
@@ -328,31 +358,26 @@ static struct pcie_port_service_driver hpdriver_portdrv = {
 	.remove		= pciehp_remove,
 
 #ifdef	CONFIG_PM
+#ifdef	CONFIG_PM_SLEEP
 	.suspend	= pciehp_suspend,
+	.resume_noirq	= pciehp_resume_noirq,
 	.resume		= pciehp_resume,
+#endif
+	.runtime_suspend = pciehp_runtime_suspend,
+	.runtime_resume	= pciehp_runtime_resume,
 #endif	/* PM */
+
+	.slot_reset	= pciehp_slot_reset,
 };
 
-static int __init pcied_init(void)
+int __init pcie_hp_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");
+	pr_debug("pcie_port_service_register = %d\n", retval);
 	if (retval)
-		dbg("Failure to register service\n");
+		pr_debug("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);