drivers/pci/hotplug/pciehp_ctrl.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * 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.
  *
  * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
  *
  */

 #define dev_fmt(fmt) "pciehp: " fmt

 #include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/pm_runtime.h>
 #include <linux/pci.h>
 #include "pciehp.h"

 /* The following routines constitute the bulk of the
    hotplug controller logic
  */

 #define SAFE_REMOVAL	 true
 #define SURPRISE_REMOVAL false

 static void set_slot_off(struct controller *ctrl)
 {
 	/*
 	 * Turn off slot, turn on attention indicator, turn off power
 	 * indicator
 	 */
 	if (POWER_CTRL(ctrl)) {
 		pciehp_power_off_slot(ctrl);

 		/*
 		 * After turning power off, we must wait for at least 1 second
 		 * before taking any action that relies on power having been
 		 * removed from the slot/adapter.
 		 */
 		msleep(1000);
 	}

 	pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
 			      PCI_EXP_SLTCTL_ATTN_IND_ON);
 }

 /**
  * board_added - Called after a board has been added to the system.
  * @ctrl: PCIe hotplug controller where board is added
  *
  * Turns power on for the board.
  * Configures board.
  */
 static int board_added(struct controller *ctrl)
 {
 	int retval = 0;
 	struct pci_bus *parent = ctrl->pcie->port->subordinate;

 	if (POWER_CTRL(ctrl)) {
 		/* Power on slot */
 		retval = pciehp_power_on_slot(ctrl);
 		if (retval)
 			return retval;
 	}

 	pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_BLINK,
 			      INDICATOR_NOOP);

 	/* Check link training status */
 	retval = pciehp_check_link_status(ctrl);
 	if (retval)
 		goto err_exit;

 	/* Check for a power fault */
 	if (ctrl->power_fault_detected || pciehp_query_power_fault(ctrl)) {
 		ctrl_err(ctrl, "Slot(%s): Power fault\n", slot_name(ctrl));
 		retval = -EIO;
 		goto err_exit;
 	}

 	retval = pciehp_configure_device(ctrl);
 	if (retval) {
 		if (retval != -EEXIST) {
 			ctrl_err(ctrl, "Cannot add device at %04x:%02x:00\n",
 				 pci_domain_nr(parent), parent->number);
 			goto err_exit;
 		}
 	}

 	pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_ON,
 			      PCI_EXP_SLTCTL_ATTN_IND_OFF);
 	return 0;

 err_exit:
 	set_slot_off(ctrl);
 	return retval;
 }

 /**
  * remove_board - Turn off slot and Power Indicator
  * @ctrl: PCIe hotplug controller where board is being removed
  * @safe_removal: whether the board is safely removed (versus surprise removed)
  */
 static void remove_board(struct controller *ctrl, bool safe_removal)
 {
 	pciehp_unconfigure_device(ctrl, safe_removal);

 	if (POWER_CTRL(ctrl)) {
 		pciehp_power_off_slot(ctrl);

 		/*
 		 * After turning power off, we must wait for at least 1 second
 		 * before taking any action that relies on power having been
 		 * removed from the slot/adapter.
 		 */
 		msleep(1000);

 		/* Ignore link or presence changes caused by power off */
 		atomic_and(~(PCI_EXP_SLTSTA_DLLSC | PCI_EXP_SLTSTA_PDC),
 			   &ctrl->pending_events);
 	}

 	pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
 			      INDICATOR_NOOP);
 }

 static int pciehp_enable_slot(struct controller *ctrl);
 static int pciehp_disable_slot(struct controller *ctrl, bool safe_removal);

 void pciehp_request(struct controller *ctrl, int action)
 {
 	atomic_or(action, &ctrl->pending_events);
 	if (!pciehp_poll_mode)
 		irq_wake_thread(ctrl->pcie->irq, ctrl);
 }

 void pciehp_queue_pushbutton_work(struct work_struct *work)
 {
 	struct controller *ctrl = container_of(work, struct controller,
 					       button_work.work);

 	mutex_lock(&ctrl->state_lock);
 	switch (ctrl->state) {
 	case BLINKINGOFF_STATE:
 		pciehp_request(ctrl, DISABLE_SLOT);
 		break;
 	case BLINKINGON_STATE:
 		pciehp_request(ctrl, PCI_EXP_SLTSTA_PDC);
 		break;
 	default:
 		break;
 	}
 	mutex_unlock(&ctrl->state_lock);
 }

 void pciehp_handle_button_press(struct controller *ctrl)
 {
 	mutex_lock(&ctrl->state_lock);
 	switch (ctrl->state) {
 	case OFF_STATE:
 	case ON_STATE:
 		if (ctrl->state == ON_STATE) {
 			ctrl->state = BLINKINGOFF_STATE;
 			ctrl_info(ctrl, "Slot(%s): Button press: will power off in 5 sec\n",
 				  slot_name(ctrl));
 		} else {
 			ctrl->state = BLINKINGON_STATE;
 			ctrl_info(ctrl, "Slot(%s): Button press: will power on in 5 sec\n",
 				  slot_name(ctrl));
 		}
 		/* blink power indicator and turn off attention */
 		pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_BLINK,
 				      PCI_EXP_SLTCTL_ATTN_IND_OFF);
 		schedule_delayed_work(&ctrl->button_work, 5 * HZ);
 		break;
 	case BLINKINGOFF_STATE:
 	case BLINKINGON_STATE:
 		/*
 		 * Cancel if we are still blinking; this means that we
 		 * press the attention again before the 5 sec. limit
 		 * expires to cancel hot-add or hot-remove
 		 */
 		cancel_delayed_work(&ctrl->button_work);
 		if (ctrl->state == BLINKINGOFF_STATE) {
 			ctrl->state = ON_STATE;
 			pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_ON,
 					      PCI_EXP_SLTCTL_ATTN_IND_OFF);
 			ctrl_info(ctrl, "Slot(%s): Button press: canceling request to power off\n",
 				  slot_name(ctrl));
 		} else {
 			ctrl->state = OFF_STATE;
 			pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
 					      PCI_EXP_SLTCTL_ATTN_IND_OFF);
 			ctrl_info(ctrl, "Slot(%s): Button press: canceling request to power on\n",
 				  slot_name(ctrl));
 		}
 		break;
 	default:
 		ctrl_err(ctrl, "Slot(%s): Button press: ignoring invalid state %#x\n",
 			 slot_name(ctrl), ctrl->state);
 		break;
 	}
 	mutex_unlock(&ctrl->state_lock);
 }

 void pciehp_handle_disable_request(struct controller *ctrl)
 {
 	mutex_lock(&ctrl->state_lock);
 	switch (ctrl->state) {
 	case BLINKINGON_STATE:
 	case BLINKINGOFF_STATE:
 		cancel_delayed_work(&ctrl->button_work);
 		break;
 	}
 	ctrl->state = POWEROFF_STATE;
 	mutex_unlock(&ctrl->state_lock);

 	ctrl->request_result = pciehp_disable_slot(ctrl, SAFE_REMOVAL);
 }

 void pciehp_handle_presence_or_link_change(struct controller *ctrl, u32 events)
 {
 	int present, link_active;

 	/*
 	 * If the slot is on and presence or link has changed, turn it off.
 	 * Even if it's occupied again, we cannot assume the card is the same.
 	 */
 	mutex_lock(&ctrl->state_lock);
 	switch (ctrl->state) {
 	case BLINKINGOFF_STATE:
 		cancel_delayed_work(&ctrl->button_work);
 		fallthrough;
 	case ON_STATE:
 		ctrl->state = POWEROFF_STATE;
 		mutex_unlock(&ctrl->state_lock);
 		if (events & PCI_EXP_SLTSTA_DLLSC)
 			ctrl_info(ctrl, "Slot(%s): Link Down\n",
 				  slot_name(ctrl));
 		if (events & PCI_EXP_SLTSTA_PDC)
 			ctrl_info(ctrl, "Slot(%s): Card not present\n",
 				  slot_name(ctrl));
 		pciehp_disable_slot(ctrl, SURPRISE_REMOVAL);
 		break;
 	default:
 		mutex_unlock(&ctrl->state_lock);
 		break;
 	}

 	/* Turn the slot on if it's occupied or link is up */
 	mutex_lock(&ctrl->state_lock);
 	present = pciehp_card_present(ctrl);
 	link_active = pciehp_check_link_active(ctrl);
 	if (present <= 0 && link_active <= 0) {
 		if (ctrl->state == BLINKINGON_STATE) {
 			ctrl->state = OFF_STATE;
 			cancel_delayed_work(&ctrl->button_work);
 			pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
 					      INDICATOR_NOOP);
 			ctrl_info(ctrl, "Slot(%s): Card not present\n",
 				  slot_name(ctrl));
 		}
 		mutex_unlock(&ctrl->state_lock);
 		return;
 	}

 	switch (ctrl->state) {
 	case BLINKINGON_STATE:
 		cancel_delayed_work(&ctrl->button_work);
 		fallthrough;
 	case OFF_STATE:
 		ctrl->state = POWERON_STATE;
 		mutex_unlock(&ctrl->state_lock);
 		if (present)
 			ctrl_info(ctrl, "Slot(%s): Card present\n",
 				  slot_name(ctrl));
 		if (link_active)
 			ctrl_info(ctrl, "Slot(%s): Link Up\n",
 				  slot_name(ctrl));
 		ctrl->request_result = pciehp_enable_slot(ctrl);
 		break;
 	default:
 		mutex_unlock(&ctrl->state_lock);
 		break;
 	}
 }

 static int __pciehp_enable_slot(struct controller *ctrl)
 {
 	u8 getstatus = 0;

 	if (MRL_SENS(ctrl)) {
 		pciehp_get_latch_status(ctrl, &getstatus);
 		if (getstatus) {
 			ctrl_info(ctrl, "Slot(%s): Latch open\n",
 				  slot_name(ctrl));
 			return -ENODEV;
 		}
 	}

 	if (POWER_CTRL(ctrl)) {
 		pciehp_get_power_status(ctrl, &getstatus);
 		if (getstatus) {
 			ctrl_info(ctrl, "Slot(%s): Already enabled\n",
 				  slot_name(ctrl));
 			return 0;
 		}
 	}

 	return board_added(ctrl);
 }

 static int pciehp_enable_slot(struct controller *ctrl)
 {
 	int ret;

 	pm_runtime_get_sync(&ctrl->pcie->port->dev);
 	ret = __pciehp_enable_slot(ctrl);
 	if (ret && ATTN_BUTTN(ctrl))
 		/* may be blinking */
 		pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
 				      INDICATOR_NOOP);
 	pm_runtime_put(&ctrl->pcie->port->dev);

 	mutex_lock(&ctrl->state_lock);
 	ctrl->state = ret ? OFF_STATE : ON_STATE;
 	mutex_unlock(&ctrl->state_lock);

 	return ret;
 }

 static int __pciehp_disable_slot(struct controller *ctrl, bool safe_removal)
 {
 	u8 getstatus = 0;

 	if (POWER_CTRL(ctrl)) {
 		pciehp_get_power_status(ctrl, &getstatus);
 		if (!getstatus) {
 			ctrl_info(ctrl, "Slot(%s): Already disabled\n",
 				  slot_name(ctrl));
 			return -EINVAL;
 		}
 	}

 	remove_board(ctrl, safe_removal);
 	return 0;
 }

 static int pciehp_disable_slot(struct controller *ctrl, bool safe_removal)
 {
 	int ret;

 	pm_runtime_get_sync(&ctrl->pcie->port->dev);
 	ret = __pciehp_disable_slot(ctrl, safe_removal);
 	pm_runtime_put(&ctrl->pcie->port->dev);

 	mutex_lock(&ctrl->state_lock);
 	ctrl->state = OFF_STATE;
 	mutex_unlock(&ctrl->state_lock);

 	return ret;
 }

 int pciehp_sysfs_enable_slot(struct hotplug_slot *hotplug_slot)
 {
 	struct controller *ctrl = to_ctrl(hotplug_slot);

 	mutex_lock(&ctrl->state_lock);
 	switch (ctrl->state) {
 	case BLINKINGON_STATE:
 	case OFF_STATE:
 		mutex_unlock(&ctrl->state_lock);
 		/*
 		 * The IRQ thread becomes a no-op if the user pulls out the
 		 * card before the thread wakes up, so initialize to -ENODEV.
 		 */
 		ctrl->request_result = -ENODEV;
 		pciehp_request(ctrl, PCI_EXP_SLTSTA_PDC);
 		wait_event(ctrl->requester,
 			   !atomic_read(&ctrl->pending_events) &&
 			   !ctrl->ist_running);
 		return ctrl->request_result;
 	case POWERON_STATE:
 		ctrl_info(ctrl, "Slot(%s): Already in powering on state\n",
 			  slot_name(ctrl));
 		break;
 	case BLINKINGOFF_STATE:
 	case ON_STATE:
 	case POWEROFF_STATE:
 		ctrl_info(ctrl, "Slot(%s): Already enabled\n",
 			  slot_name(ctrl));
 		break;
 	default:
 		ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
 			 slot_name(ctrl), ctrl->state);
 		break;
 	}
 	mutex_unlock(&ctrl->state_lock);

 	return -ENODEV;
 }

 int pciehp_sysfs_disable_slot(struct hotplug_slot *hotplug_slot)
 {
 	struct controller *ctrl = to_ctrl(hotplug_slot);

 	mutex_lock(&ctrl->state_lock);
 	switch (ctrl->state) {
 	case BLINKINGOFF_STATE:
 	case ON_STATE:
 		mutex_unlock(&ctrl->state_lock);
 		pciehp_request(ctrl, DISABLE_SLOT);
 		wait_event(ctrl->requester,
 			   !atomic_read(&ctrl->pending_events) &&
 			   !ctrl->ist_running);
 		return ctrl->request_result;
 	case POWEROFF_STATE:
 		ctrl_info(ctrl, "Slot(%s): Already in powering off state\n",
 			  slot_name(ctrl));
 		break;
 	case BLINKINGON_STATE:
 	case OFF_STATE:
 	case POWERON_STATE:
 		ctrl_info(ctrl, "Slot(%s): Already disabled\n",
 			  slot_name(ctrl));
 		break;
 	default:
 		ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
 			 slot_name(ctrl), ctrl->state);
 		break;
 	}
 	mutex_unlock(&ctrl->state_lock);

 	return -ENODEV;
 }
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* 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.
	*
	* Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
	*
	*/

	#define dev_fmt(fmt) "pciehp: " fmt

	#include <linux/kernel.h>
	#include <linux/types.h>
	#include <linux/pm_runtime.h>
	#include <linux/pci.h>
	#include "pciehp.h"

	/* The following routines constitute the bulk of the
	hotplug controller logic
	*/

	#define SAFE_REMOVAL true
	#define SURPRISE_REMOVAL false

	static void set_slot_off(struct controller *ctrl)
	{
	/*
	* Turn off slot, turn on attention indicator, turn off power
	* indicator
	*/
	if (POWER_CTRL(ctrl)) {
	pciehp_power_off_slot(ctrl);

	/*
	* After turning power off, we must wait for at least 1 second
	* before taking any action that relies on power having been
	* removed from the slot/adapter.
	*/
	msleep(1000);
	}

	pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
	PCI_EXP_SLTCTL_ATTN_IND_ON);
	}

	/**
	* board_added - Called after a board has been added to the system.
	* @ctrl: PCIe hotplug controller where board is added
	*
	* Turns power on for the board.
	* Configures board.
	*/
	static int board_added(struct controller *ctrl)
	{
	int retval = 0;
	struct pci_bus *parent = ctrl->pcie->port->subordinate;

	if (POWER_CTRL(ctrl)) {
	/* Power on slot */
	retval = pciehp_power_on_slot(ctrl);
	if (retval)
	return retval;
	}

	pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_BLINK,
	INDICATOR_NOOP);

	/* Check link training status */
	retval = pciehp_check_link_status(ctrl);
	if (retval)
	goto err_exit;

	/* Check for a power fault */
	if (ctrl->power_fault_detected \|\| pciehp_query_power_fault(ctrl)) {
	ctrl_err(ctrl, "Slot(%s): Power fault\n", slot_name(ctrl));
	retval = -EIO;
	goto err_exit;
	}

	retval = pciehp_configure_device(ctrl);
	if (retval) {
	if (retval != -EEXIST) {
	ctrl_err(ctrl, "Cannot add device at %04x:%02x:00\n",
	pci_domain_nr(parent), parent->number);
	goto err_exit;
	}
	}

	pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_ON,
	PCI_EXP_SLTCTL_ATTN_IND_OFF);
	return 0;

	err_exit:
	set_slot_off(ctrl);
	return retval;
	}

	/**
	* remove_board - Turn off slot and Power Indicator
	* @ctrl: PCIe hotplug controller where board is being removed
	* @safe_removal: whether the board is safely removed (versus surprise removed)
	*/
	static void remove_board(struct controller *ctrl, bool safe_removal)
	{
	pciehp_unconfigure_device(ctrl, safe_removal);

	if (POWER_CTRL(ctrl)) {
	pciehp_power_off_slot(ctrl);

	/*
	* After turning power off, we must wait for at least 1 second
	* before taking any action that relies on power having been
	* removed from the slot/adapter.
	*/
	msleep(1000);

	/* Ignore link or presence changes caused by power off */
	atomic_and(~(PCI_EXP_SLTSTA_DLLSC \| PCI_EXP_SLTSTA_PDC),
	&ctrl->pending_events);
	}

	pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
	INDICATOR_NOOP);
	}

	static int pciehp_enable_slot(struct controller *ctrl);
	static int pciehp_disable_slot(struct controller *ctrl, bool safe_removal);

	void pciehp_request(struct controller *ctrl, int action)
	{
	atomic_or(action, &ctrl->pending_events);
	if (!pciehp_poll_mode)
	irq_wake_thread(ctrl->pcie->irq, ctrl);
	}

	void pciehp_queue_pushbutton_work(struct work_struct *work)
	{
	struct controller *ctrl = container_of(work, struct controller,
	button_work.work);

	mutex_lock(&ctrl->state_lock);
	switch (ctrl->state) {
	case BLINKINGOFF_STATE:
	pciehp_request(ctrl, DISABLE_SLOT);
	break;
	case BLINKINGON_STATE:
	pciehp_request(ctrl, PCI_EXP_SLTSTA_PDC);
	break;
	default:
	break;
	}
	mutex_unlock(&ctrl->state_lock);
	}

	void pciehp_handle_button_press(struct controller *ctrl)
	{
	mutex_lock(&ctrl->state_lock);
	switch (ctrl->state) {
	case OFF_STATE:
	case ON_STATE:
	if (ctrl->state == ON_STATE) {
	ctrl->state = BLINKINGOFF_STATE;
	ctrl_info(ctrl, "Slot(%s): Button press: will power off in 5 sec\n",
	slot_name(ctrl));
	} else {
	ctrl->state = BLINKINGON_STATE;
	ctrl_info(ctrl, "Slot(%s): Button press: will power on in 5 sec\n",
	slot_name(ctrl));
	}
	/* blink power indicator and turn off attention */
	pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_BLINK,
	PCI_EXP_SLTCTL_ATTN_IND_OFF);
	schedule_delayed_work(&ctrl->button_work, 5 * HZ);
	break;
	case BLINKINGOFF_STATE:
	case BLINKINGON_STATE:
	/*
	* Cancel if we are still blinking; this means that we
	* press the attention again before the 5 sec. limit
	* expires to cancel hot-add or hot-remove
	*/
	cancel_delayed_work(&ctrl->button_work);
	if (ctrl->state == BLINKINGOFF_STATE) {
	ctrl->state = ON_STATE;
	pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_ON,
	PCI_EXP_SLTCTL_ATTN_IND_OFF);
	ctrl_info(ctrl, "Slot(%s): Button press: canceling request to power off\n",
	slot_name(ctrl));
	} else {
	ctrl->state = OFF_STATE;
	pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
	PCI_EXP_SLTCTL_ATTN_IND_OFF);
	ctrl_info(ctrl, "Slot(%s): Button press: canceling request to power on\n",
	slot_name(ctrl));
	}
	break;
	default:
	ctrl_err(ctrl, "Slot(%s): Button press: ignoring invalid state %#x\n",
	slot_name(ctrl), ctrl->state);
	break;
	}
	mutex_unlock(&ctrl->state_lock);
	}

	void pciehp_handle_disable_request(struct controller *ctrl)
	{
	mutex_lock(&ctrl->state_lock);
	switch (ctrl->state) {
	case BLINKINGON_STATE:
	case BLINKINGOFF_STATE:
	cancel_delayed_work(&ctrl->button_work);
	break;
	}
	ctrl->state = POWEROFF_STATE;
	mutex_unlock(&ctrl->state_lock);

	ctrl->request_result = pciehp_disable_slot(ctrl, SAFE_REMOVAL);
	}

	void pciehp_handle_presence_or_link_change(struct controller *ctrl, u32 events)
	{
	int present, link_active;

	/*
	* If the slot is on and presence or link has changed, turn it off.
	* Even if it's occupied again, we cannot assume the card is the same.
	*/
	mutex_lock(&ctrl->state_lock);
	switch (ctrl->state) {
	case BLINKINGOFF_STATE:
	cancel_delayed_work(&ctrl->button_work);
	fallthrough;
	case ON_STATE:
	ctrl->state = POWEROFF_STATE;
	mutex_unlock(&ctrl->state_lock);
	if (events & PCI_EXP_SLTSTA_DLLSC)
	ctrl_info(ctrl, "Slot(%s): Link Down\n",
	slot_name(ctrl));
	if (events & PCI_EXP_SLTSTA_PDC)
	ctrl_info(ctrl, "Slot(%s): Card not present\n",
	slot_name(ctrl));
	pciehp_disable_slot(ctrl, SURPRISE_REMOVAL);
	break;
	default:
	mutex_unlock(&ctrl->state_lock);
	break;
	}

	/* Turn the slot on if it's occupied or link is up */
	mutex_lock(&ctrl->state_lock);
	present = pciehp_card_present(ctrl);
	link_active = pciehp_check_link_active(ctrl);
	if (present <= 0 && link_active <= 0) {
	if (ctrl->state == BLINKINGON_STATE) {
	ctrl->state = OFF_STATE;
	cancel_delayed_work(&ctrl->button_work);
	pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
	INDICATOR_NOOP);
	ctrl_info(ctrl, "Slot(%s): Card not present\n",
	slot_name(ctrl));
	}
	mutex_unlock(&ctrl->state_lock);
	return;
	}

	switch (ctrl->state) {
	case BLINKINGON_STATE:
	cancel_delayed_work(&ctrl->button_work);
	fallthrough;
	case OFF_STATE:
	ctrl->state = POWERON_STATE;
	mutex_unlock(&ctrl->state_lock);
	if (present)
	ctrl_info(ctrl, "Slot(%s): Card present\n",
	slot_name(ctrl));
	if (link_active)
	ctrl_info(ctrl, "Slot(%s): Link Up\n",
	slot_name(ctrl));
	ctrl->request_result = pciehp_enable_slot(ctrl);
	break;
	default:
	mutex_unlock(&ctrl->state_lock);
	break;
	}
	}

	static int __pciehp_enable_slot(struct controller *ctrl)
	{
	u8 getstatus = 0;

	if (MRL_SENS(ctrl)) {
	pciehp_get_latch_status(ctrl, &getstatus);
	if (getstatus) {
	ctrl_info(ctrl, "Slot(%s): Latch open\n",
	slot_name(ctrl));
	return -ENODEV;
	}
	}

	if (POWER_CTRL(ctrl)) {
	pciehp_get_power_status(ctrl, &getstatus);
	if (getstatus) {
	ctrl_info(ctrl, "Slot(%s): Already enabled\n",
	slot_name(ctrl));
	return 0;
	}
	}

	return board_added(ctrl);
	}

	static int pciehp_enable_slot(struct controller *ctrl)
	{
	int ret;

	pm_runtime_get_sync(&ctrl->pcie->port->dev);
	ret = __pciehp_enable_slot(ctrl);
	if (ret && ATTN_BUTTN(ctrl))
	/* may be blinking */
	pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
	INDICATOR_NOOP);
	pm_runtime_put(&ctrl->pcie->port->dev);

	mutex_lock(&ctrl->state_lock);
	ctrl->state = ret ? OFF_STATE : ON_STATE;
	mutex_unlock(&ctrl->state_lock);

	return ret;
	}

	static int __pciehp_disable_slot(struct controller *ctrl, bool safe_removal)
	{
	u8 getstatus = 0;

	if (POWER_CTRL(ctrl)) {
	pciehp_get_power_status(ctrl, &getstatus);
	if (!getstatus) {
	ctrl_info(ctrl, "Slot(%s): Already disabled\n",
	slot_name(ctrl));
	return -EINVAL;
	}
	}

	remove_board(ctrl, safe_removal);
	return 0;
	}

	static int pciehp_disable_slot(struct controller *ctrl, bool safe_removal)
	{
	int ret;

	pm_runtime_get_sync(&ctrl->pcie->port->dev);
	ret = __pciehp_disable_slot(ctrl, safe_removal);
	pm_runtime_put(&ctrl->pcie->port->dev);

	mutex_lock(&ctrl->state_lock);
	ctrl->state = OFF_STATE;
	mutex_unlock(&ctrl->state_lock);

	return ret;
	}

	int pciehp_sysfs_enable_slot(struct hotplug_slot *hotplug_slot)
	{
	struct controller *ctrl = to_ctrl(hotplug_slot);

	mutex_lock(&ctrl->state_lock);
	switch (ctrl->state) {
	case BLINKINGON_STATE:
	case OFF_STATE:
	mutex_unlock(&ctrl->state_lock);
	/*
	* The IRQ thread becomes a no-op if the user pulls out the
	* card before the thread wakes up, so initialize to -ENODEV.
	*/
	ctrl->request_result = -ENODEV;
	pciehp_request(ctrl, PCI_EXP_SLTSTA_PDC);
	wait_event(ctrl->requester,
	!atomic_read(&ctrl->pending_events) &&
	!ctrl->ist_running);
	return ctrl->request_result;
	case POWERON_STATE:
	ctrl_info(ctrl, "Slot(%s): Already in powering on state\n",
	slot_name(ctrl));
	break;
	case BLINKINGOFF_STATE:
	case ON_STATE:
	case POWEROFF_STATE:
	ctrl_info(ctrl, "Slot(%s): Already enabled\n",
	slot_name(ctrl));
	break;
	default:
	ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
	slot_name(ctrl), ctrl->state);
	break;
	}
	mutex_unlock(&ctrl->state_lock);

	return -ENODEV;
	}

	int pciehp_sysfs_disable_slot(struct hotplug_slot *hotplug_slot)
	{
	struct controller *ctrl = to_ctrl(hotplug_slot);

	mutex_lock(&ctrl->state_lock);
	switch (ctrl->state) {
	case BLINKINGOFF_STATE:
	case ON_STATE:
	mutex_unlock(&ctrl->state_lock);
	pciehp_request(ctrl, DISABLE_SLOT);
	wait_event(ctrl->requester,
	!atomic_read(&ctrl->pending_events) &&
	!ctrl->ist_running);
	return ctrl->request_result;
	case POWEROFF_STATE:
	ctrl_info(ctrl, "Slot(%s): Already in powering off state\n",
	slot_name(ctrl));
	break;
	case BLINKINGON_STATE:
	case OFF_STATE:
	case POWERON_STATE:
	ctrl_info(ctrl, "Slot(%s): Already disabled\n",
	slot_name(ctrl));
	break;
	default:
	ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
	slot_name(ctrl), ctrl->state);
	break;
	}
	mutex_unlock(&ctrl->state_lock);

	return -ENODEV;
	}