Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 217 insertions, 0 deletions

diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h
new file mode 100644
index 000000000..ef6071807
--- /dev/null
+++ b/drivers/pci/hotplug/pciehp.h
@@ -0,0 +1,217 @@
+/* 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>
+ *
+ */
+#ifndef _PCIEHP_H
+#define _PCIEHP_H
+
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/pci_hotplug.h>
+#include <linux/delay.h>
+#include <linux/sched/signal.h>		/* signal_pending() */
+#include <linux/mutex.h>
+#include <linux/rwsem.h>
+#include <linux/workqueue.h>
+
+#include "../pcie/portdrv.h"
+
+#define MY_NAME	"pciehp"
+
+extern bool pciehp_poll_mode;
+extern int pciehp_poll_time;
+extern bool pciehp_debug;
+
+#define dbg(format, arg...)						\
+do {									\
+	if (pciehp_debug)						\
+		printk(KERN_DEBUG "%s: " format, MY_NAME, ## arg);	\
+} while (0)
+#define err(format, arg...)						\
+	printk(KERN_ERR "%s: " format, MY_NAME, ## arg)
+#define info(format, arg...)						\
+	printk(KERN_INFO "%s: " format, MY_NAME, ## arg)
+#define warn(format, arg...)						\
+	printk(KERN_WARNING "%s: " format, MY_NAME, ## arg)
+
+#define ctrl_dbg(ctrl, format, arg...)					\
+	do {								\
+		if (pciehp_debug)					\
+			dev_printk(KERN_DEBUG, &ctrl->pcie->device,	\
+					format, ## arg);		\
+	} while (0)
+#define ctrl_err(ctrl, format, arg...)					\
+	dev_err(&ctrl->pcie->device, format, ## arg)
+#define ctrl_info(ctrl, format, arg...)					\
+	dev_info(&ctrl->pcie->device, format, ## arg)
+#define ctrl_warn(ctrl, format, arg...)					\
+	dev_warn(&ctrl->pcie->device, format, ## arg)
+
+#define SLOT_NAME_SIZE 10
+
+/**
+ * struct slot - PCIe hotplug slot
+ * @state: current state machine position
+ * @ctrl: pointer to the slot's controller structure
+ * @hotplug_slot: pointer to the structure registered with the PCI hotplug core
+ * @work: work item to turn the slot on or off after 5 seconds in response to
+ *	an Attention Button press
+ * @lock: protects reads and writes of @state;
+ *	protects scheduling, execution and cancellation of @work
+ */
+struct slot {
+	u8 state;
+	struct controller *ctrl;
+	struct hotplug_slot *hotplug_slot;
+	struct delayed_work work;
+	struct mutex lock;
+};
+
+/**
+ * struct controller - PCIe hotplug controller
+ * @ctrl_lock: serializes writes to the Slot Control register
+ * @pcie: pointer to the controller's PCIe port service device
+ * @reset_lock: prevents access to the Data Link Layer Link Active bit in the
+ *	Link Status register and to the Presence Detect State bit in the Slot
+ *	Status register during a slot reset which may cause them to flap
+ * @slot: pointer to the controller's slot structure
+ * @queue: wait queue to wake up on reception of a Command Completed event,
+ *	used for synchronous writes to the Slot Control register
+ * @slot_cap: cached copy of the Slot Capabilities register
+ * @slot_ctrl: cached copy of the Slot Control register
+ * @poll_thread: thread to poll for slot events if no IRQ is available,
+ *	enabled with pciehp_poll_mode module parameter
+ * @cmd_started: jiffies when the Slot Control register was last written;
+ *	the next write is allowed 1 second later, absent a Command Completed
+ *	interrupt (PCIe r4.0, sec 6.7.3.2)
+ * @cmd_busy: flag set on Slot Control register write, cleared by IRQ handler
+ *	on reception of a Command Completed event
+ * @link_active_reporting: cached copy of Data Link Layer Link Active Reporting
+ *	Capable bit in Link Capabilities register; if this bit is zero, the
+ *	Data Link Layer Link Active bit in the Link Status register will never
+ *	be set and the driver is thus confined to wait 1 second before assuming
+ *	the link to a hotplugged device is up and accessing it
+ * @notification_enabled: whether the IRQ was requested successfully
+ * @power_fault_detected: whether a power fault was detected by the hardware
+ *	that has not yet been cleared by the user
+ * @pending_events: used by the IRQ handler to save events retrieved from the
+ *	Slot Status register for later consumption by the IRQ thread
+ * @ist_running: flag to keep user request waiting while IRQ thread is running
+ * @request_result: result of last user request submitted to the IRQ thread
+ * @requester: wait queue to wake up on completion of user request,
+ *	used for synchronous slot enable/disable request via sysfs
+ */
+struct controller {
+	struct mutex ctrl_lock;
+	struct pcie_device *pcie;
+	struct rw_semaphore reset_lock;
+	struct slot *slot;
+	wait_queue_head_t queue;
+	u32 slot_cap;
+	u16 slot_ctrl;
+	struct task_struct *poll_thread;
+	unsigned long cmd_started;	/* jiffies */
+	unsigned int cmd_busy:1;
+	unsigned int link_active_reporting:1;
+	unsigned int notification_enabled:1;
+	unsigned int power_fault_detected;
+	atomic_t pending_events;
+	unsigned int ist_running;
+	int request_result;
+	wait_queue_head_t requester;
+};
+
+/**
+ * DOC: Slot state
+ *
+ * @OFF_STATE: slot is powered off, no subordinate devices are enumerated
+ * @BLINKINGON_STATE: slot will be powered on after the 5 second delay,
+ *	green led is blinking
+ * @BLINKINGOFF_STATE: slot will be powered off after the 5 second delay,
+ *	green led is blinking
+ * @POWERON_STATE: slot is currently powering on
+ * @POWEROFF_STATE: slot is currently powering off
+ * @ON_STATE: slot is powered on, subordinate devices have been enumerated
+ */
+#define OFF_STATE			0
+#define BLINKINGON_STATE		1
+#define BLINKINGOFF_STATE		2
+#define POWERON_STATE			3
+#define POWEROFF_STATE			4
+#define ON_STATE			5
+
+/**
+ * DOC: Flags to request an action from the IRQ thread
+ *
+ * These are stored together with events read from the Slot Status register,
+ * hence must be greater than its 16-bit width.
+ *
+ * %DISABLE_SLOT: Disable the slot in response to a user request via sysfs or
+ *	an Attention Button press after the 5 second delay
+ * %RERUN_ISR: Used by the IRQ handler to inform the IRQ thread that the
+ *	hotplug port was inaccessible when the interrupt occurred, requiring
+ *	that the IRQ handler is rerun by the IRQ thread after it has made the
+ *	hotplug port accessible by runtime resuming its parents to D0
+ */
+#define DISABLE_SLOT		(1 << 16)
+#define RERUN_ISR		(1 << 17)
+
+#define ATTN_BUTTN(ctrl)	((ctrl)->slot_cap & PCI_EXP_SLTCAP_ABP)
+#define POWER_CTRL(ctrl)	((ctrl)->slot_cap & PCI_EXP_SLTCAP_PCP)
+#define MRL_SENS(ctrl)		((ctrl)->slot_cap & PCI_EXP_SLTCAP_MRLSP)
+#define ATTN_LED(ctrl)		((ctrl)->slot_cap & PCI_EXP_SLTCAP_AIP)
+#define PWR_LED(ctrl)		((ctrl)->slot_cap & PCI_EXP_SLTCAP_PIP)
+#define HP_SUPR_RM(ctrl)	((ctrl)->slot_cap & PCI_EXP_SLTCAP_HPS)
+#define EMI(ctrl)		((ctrl)->slot_cap & PCI_EXP_SLTCAP_EIP)
+#define NO_CMD_CMPL(ctrl)	((ctrl)->slot_cap & PCI_EXP_SLTCAP_NCCS)
+#define PSN(ctrl)		(((ctrl)->slot_cap & PCI_EXP_SLTCAP_PSN) >> 19)
+
+int pciehp_sysfs_enable_slot(struct slot *slot);
+int pciehp_sysfs_disable_slot(struct slot *slot);
+void pciehp_request(struct controller *ctrl, int action);
+void pciehp_handle_button_press(struct slot *slot);
+void pciehp_handle_disable_request(struct slot *slot);
+void pciehp_handle_presence_or_link_change(struct slot *slot, u32 events);
+int pciehp_configure_device(struct slot *p_slot);
+void pciehp_unconfigure_device(struct slot *p_slot);
+void pciehp_queue_pushbutton_work(struct work_struct *work);
+struct controller *pcie_init(struct pcie_device *dev);
+int pcie_init_notification(struct controller *ctrl);
+void pcie_shutdown_notification(struct controller *ctrl);
+void pcie_clear_hotplug_events(struct controller *ctrl);
+int pciehp_power_on_slot(struct slot *slot);
+void pciehp_power_off_slot(struct slot *slot);
+void pciehp_get_power_status(struct slot *slot, u8 *status);
+void pciehp_get_attention_status(struct slot *slot, u8 *status);
+
+void pciehp_set_attention_status(struct slot *slot, u8 status);
+void pciehp_get_latch_status(struct slot *slot, u8 *status);
+void pciehp_get_adapter_status(struct slot *slot, u8 *status);
+int pciehp_query_power_fault(struct slot *slot);
+void pciehp_green_led_on(struct slot *slot);
+void pciehp_green_led_off(struct slot *slot);
+void pciehp_green_led_blink(struct slot *slot);
+int pciehp_check_link_status(struct controller *ctrl);
+bool pciehp_check_link_active(struct controller *ctrl);
+void pciehp_release_ctrl(struct controller *ctrl);
+int pciehp_reset_slot(struct slot *slot, int probe);
+
+int pciehp_set_raw_indicator_status(struct hotplug_slot *h_slot, u8 status);
+int pciehp_get_raw_indicator_status(struct hotplug_slot *h_slot, u8 *status);
+
+static inline const char *slot_name(struct slot *slot)
+{
+	return hotplug_slot_name(slot->hotplug_slot);
+}
+
+#endif				/* _PCIEHP_H */