678 lines
21 KiB
C
678 lines
21 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Thunderbolt service API
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*
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* Copyright (C) 2014 Andreas Noever <andreas.noever@gmail.com>
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* Copyright (C) 2017, Intel Corporation
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* Authors: Michael Jamet <michael.jamet@intel.com>
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* Mika Westerberg <mika.westerberg@linux.intel.com>
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*/
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#ifndef THUNDERBOLT_H_
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#define THUNDERBOLT_H_
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#include <linux/device.h>
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#include <linux/idr.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/mod_devicetable.h>
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#include <linux/pci.h>
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#include <linux/uuid.h>
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#include <linux/workqueue.h>
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enum tb_cfg_pkg_type {
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TB_CFG_PKG_READ = 1,
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TB_CFG_PKG_WRITE = 2,
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TB_CFG_PKG_ERROR = 3,
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TB_CFG_PKG_NOTIFY_ACK = 4,
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TB_CFG_PKG_EVENT = 5,
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TB_CFG_PKG_XDOMAIN_REQ = 6,
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TB_CFG_PKG_XDOMAIN_RESP = 7,
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TB_CFG_PKG_OVERRIDE = 8,
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TB_CFG_PKG_RESET = 9,
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TB_CFG_PKG_ICM_EVENT = 10,
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TB_CFG_PKG_ICM_CMD = 11,
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TB_CFG_PKG_ICM_RESP = 12,
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};
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/**
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* enum tb_security_level - Thunderbolt security level
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* @TB_SECURITY_NONE: No security, legacy mode
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* @TB_SECURITY_USER: User approval required at minimum
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* @TB_SECURITY_SECURE: One time saved key required at minimum
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* @TB_SECURITY_DPONLY: Only tunnel Display port (and USB)
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* @TB_SECURITY_USBONLY: Only tunnel USB controller of the connected
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* Thunderbolt dock (and Display Port). All PCIe
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* links downstream of the dock are removed.
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* @TB_SECURITY_NOPCIE: For USB4 systems this level is used when the
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* PCIe tunneling is disabled from the BIOS.
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*/
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enum tb_security_level {
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TB_SECURITY_NONE,
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TB_SECURITY_USER,
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TB_SECURITY_SECURE,
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TB_SECURITY_DPONLY,
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TB_SECURITY_USBONLY,
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TB_SECURITY_NOPCIE,
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};
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/**
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* struct tb - main thunderbolt bus structure
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* @dev: Domain device
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* @lock: Big lock. Must be held when accessing any struct
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* tb_switch / struct tb_port.
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* @nhi: Pointer to the NHI structure
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* @ctl: Control channel for this domain
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* @wq: Ordered workqueue for all domain specific work
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* @root_switch: Root switch of this domain
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* @cm_ops: Connection manager specific operations vector
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* @index: Linux assigned domain number
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* @security_level: Current security level
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* @nboot_acl: Number of boot ACLs the domain supports
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* @privdata: Private connection manager specific data
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*/
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struct tb {
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struct device dev;
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struct mutex lock;
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struct tb_nhi *nhi;
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struct tb_ctl *ctl;
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struct workqueue_struct *wq;
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struct tb_switch *root_switch;
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const struct tb_cm_ops *cm_ops;
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int index;
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enum tb_security_level security_level;
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size_t nboot_acl;
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unsigned long privdata[];
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};
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extern const struct bus_type tb_bus_type;
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extern const struct device_type tb_service_type;
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extern const struct device_type tb_xdomain_type;
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#define TB_LINKS_PER_PHY_PORT 2
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static inline unsigned int tb_phy_port_from_link(unsigned int link)
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{
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return (link - 1) / TB_LINKS_PER_PHY_PORT;
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}
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/**
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* struct tb_property_dir - XDomain property directory
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* @uuid: Directory UUID or %NULL if root directory
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* @properties: List of properties in this directory
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*
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* User needs to provide serialization if needed.
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*/
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struct tb_property_dir {
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const uuid_t *uuid;
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struct list_head properties;
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};
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enum tb_property_type {
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TB_PROPERTY_TYPE_UNKNOWN = 0x00,
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TB_PROPERTY_TYPE_DIRECTORY = 0x44,
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TB_PROPERTY_TYPE_DATA = 0x64,
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TB_PROPERTY_TYPE_TEXT = 0x74,
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TB_PROPERTY_TYPE_VALUE = 0x76,
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};
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#define TB_PROPERTY_KEY_SIZE 8
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/**
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* struct tb_property - XDomain property
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* @list: Used to link properties together in a directory
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* @key: Key for the property (always terminated).
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* @type: Type of the property
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* @length: Length of the property data in dwords
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* @value: Property value
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*
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* Users use @type to determine which field in @value is filled.
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*/
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struct tb_property {
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struct list_head list;
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char key[TB_PROPERTY_KEY_SIZE + 1];
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enum tb_property_type type;
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size_t length;
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union {
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struct tb_property_dir *dir;
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u8 *data;
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char *text;
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u32 immediate;
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} value;
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};
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struct tb_property_dir *tb_property_parse_dir(const u32 *block,
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size_t block_len);
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ssize_t tb_property_format_dir(const struct tb_property_dir *dir, u32 *block,
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size_t block_len);
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struct tb_property_dir *tb_property_copy_dir(const struct tb_property_dir *dir);
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struct tb_property_dir *tb_property_create_dir(const uuid_t *uuid);
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void tb_property_free_dir(struct tb_property_dir *dir);
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int tb_property_add_immediate(struct tb_property_dir *parent, const char *key,
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u32 value);
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int tb_property_add_data(struct tb_property_dir *parent, const char *key,
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const void *buf, size_t buflen);
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int tb_property_add_text(struct tb_property_dir *parent, const char *key,
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const char *text);
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int tb_property_add_dir(struct tb_property_dir *parent, const char *key,
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struct tb_property_dir *dir);
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void tb_property_remove(struct tb_property *tb_property);
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struct tb_property *tb_property_find(struct tb_property_dir *dir,
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const char *key, enum tb_property_type type);
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struct tb_property *tb_property_get_next(struct tb_property_dir *dir,
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struct tb_property *prev);
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#define tb_property_for_each(dir, property) \
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for (property = tb_property_get_next(dir, NULL); \
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property; \
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property = tb_property_get_next(dir, property))
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int tb_register_property_dir(const char *key, struct tb_property_dir *dir);
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void tb_unregister_property_dir(const char *key, struct tb_property_dir *dir);
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/**
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* enum tb_link_width - Thunderbolt/USB4 link width
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* @TB_LINK_WIDTH_SINGLE: Single lane link
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* @TB_LINK_WIDTH_DUAL: Dual lane symmetric link
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* @TB_LINK_WIDTH_ASYM_TX: Dual lane asymmetric Gen 4 link with 3 transmitters
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* @TB_LINK_WIDTH_ASYM_RX: Dual lane asymmetric Gen 4 link with 3 receivers
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*/
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enum tb_link_width {
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TB_LINK_WIDTH_SINGLE = BIT(0),
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TB_LINK_WIDTH_DUAL = BIT(1),
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TB_LINK_WIDTH_ASYM_TX = BIT(2),
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TB_LINK_WIDTH_ASYM_RX = BIT(3),
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};
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/**
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* struct tb_xdomain - Cross-domain (XDomain) connection
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* @dev: XDomain device
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* @tb: Pointer to the domain
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* @remote_uuid: UUID of the remote domain (host)
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* @local_uuid: Cached local UUID
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* @route: Route string the other domain can be reached
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* @vendor: Vendor ID of the remote domain
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* @device: Device ID of the demote domain
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* @local_max_hopid: Maximum input HopID of this host
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* @remote_max_hopid: Maximum input HopID of the remote host
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* @lock: Lock to serialize access to the following fields of this structure
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* @vendor_name: Name of the vendor (or %NULL if not known)
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* @device_name: Name of the device (or %NULL if not known)
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* @link_speed: Speed of the link in Gb/s
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* @link_width: Width of the downstream facing link
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* @link_usb4: Downstream link is USB4
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* @is_unplugged: The XDomain is unplugged
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* @needs_uuid: If the XDomain does not have @remote_uuid it will be
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* queried first
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* @service_ids: Used to generate IDs for the services
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* @in_hopids: Input HopIDs for DMA tunneling
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* @out_hopids; Output HopIDs for DMA tunneling
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* @local_property_block: Local block of properties
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* @local_property_block_gen: Generation of @local_property_block
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* @local_property_block_len: Length of the @local_property_block in dwords
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* @remote_properties: Properties exported by the remote domain
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* @remote_property_block_gen: Generation of @remote_properties
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* @state: Next XDomain discovery state to run
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* @state_work: Work used to run the next state
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* @state_retries: Number of retries remain for the state
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* @properties_changed_work: Work used to notify the remote domain that
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* our properties have changed
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* @properties_changed_retries: Number of times left to send properties
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* changed notification
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* @bonding_possible: True if lane bonding is possible on local side
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* @target_link_width: Target link width from the remote host
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* @link: Root switch link the remote domain is connected (ICM only)
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* @depth: Depth in the chain the remote domain is connected (ICM only)
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*
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* This structure represents connection across two domains (hosts).
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* Each XDomain contains zero or more services which are exposed as
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* &struct tb_service objects.
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*
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* Service drivers may access this structure if they need to enumerate
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* non-standard properties but they need hold @lock when doing so
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* because properties can be changed asynchronously in response to
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* changes in the remote domain.
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*/
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struct tb_xdomain {
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struct device dev;
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struct tb *tb;
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uuid_t *remote_uuid;
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const uuid_t *local_uuid;
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u64 route;
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u16 vendor;
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u16 device;
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unsigned int local_max_hopid;
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unsigned int remote_max_hopid;
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struct mutex lock;
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const char *vendor_name;
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const char *device_name;
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unsigned int link_speed;
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enum tb_link_width link_width;
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bool link_usb4;
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bool is_unplugged;
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bool needs_uuid;
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struct ida service_ids;
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struct ida in_hopids;
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struct ida out_hopids;
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u32 *local_property_block;
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u32 local_property_block_gen;
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u32 local_property_block_len;
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struct tb_property_dir *remote_properties;
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u32 remote_property_block_gen;
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int state;
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struct delayed_work state_work;
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int state_retries;
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struct delayed_work properties_changed_work;
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int properties_changed_retries;
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bool bonding_possible;
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u8 target_link_width;
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u8 link;
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u8 depth;
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};
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int tb_xdomain_lane_bonding_enable(struct tb_xdomain *xd);
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void tb_xdomain_lane_bonding_disable(struct tb_xdomain *xd);
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int tb_xdomain_alloc_in_hopid(struct tb_xdomain *xd, int hopid);
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void tb_xdomain_release_in_hopid(struct tb_xdomain *xd, int hopid);
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int tb_xdomain_alloc_out_hopid(struct tb_xdomain *xd, int hopid);
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void tb_xdomain_release_out_hopid(struct tb_xdomain *xd, int hopid);
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int tb_xdomain_enable_paths(struct tb_xdomain *xd, int transmit_path,
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int transmit_ring, int receive_path,
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int receive_ring);
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int tb_xdomain_disable_paths(struct tb_xdomain *xd, int transmit_path,
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int transmit_ring, int receive_path,
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int receive_ring);
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static inline int tb_xdomain_disable_all_paths(struct tb_xdomain *xd)
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{
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return tb_xdomain_disable_paths(xd, -1, -1, -1, -1);
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}
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struct tb_xdomain *tb_xdomain_find_by_uuid(struct tb *tb, const uuid_t *uuid);
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struct tb_xdomain *tb_xdomain_find_by_route(struct tb *tb, u64 route);
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static inline struct tb_xdomain *
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tb_xdomain_find_by_uuid_locked(struct tb *tb, const uuid_t *uuid)
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{
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struct tb_xdomain *xd;
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mutex_lock(&tb->lock);
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xd = tb_xdomain_find_by_uuid(tb, uuid);
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mutex_unlock(&tb->lock);
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return xd;
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}
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static inline struct tb_xdomain *
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tb_xdomain_find_by_route_locked(struct tb *tb, u64 route)
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{
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struct tb_xdomain *xd;
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mutex_lock(&tb->lock);
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xd = tb_xdomain_find_by_route(tb, route);
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mutex_unlock(&tb->lock);
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return xd;
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}
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static inline struct tb_xdomain *tb_xdomain_get(struct tb_xdomain *xd)
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{
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if (xd)
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get_device(&xd->dev);
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return xd;
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}
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static inline void tb_xdomain_put(struct tb_xdomain *xd)
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{
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if (xd)
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put_device(&xd->dev);
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}
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static inline bool tb_is_xdomain(const struct device *dev)
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{
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return dev->type == &tb_xdomain_type;
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}
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static inline struct tb_xdomain *tb_to_xdomain(struct device *dev)
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{
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if (tb_is_xdomain(dev))
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return container_of(dev, struct tb_xdomain, dev);
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return NULL;
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}
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int tb_xdomain_response(struct tb_xdomain *xd, const void *response,
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size_t size, enum tb_cfg_pkg_type type);
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int tb_xdomain_request(struct tb_xdomain *xd, const void *request,
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size_t request_size, enum tb_cfg_pkg_type request_type,
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void *response, size_t response_size,
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enum tb_cfg_pkg_type response_type,
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unsigned int timeout_msec);
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/**
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* tb_protocol_handler - Protocol specific handler
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* @uuid: XDomain messages with this UUID are dispatched to this handler
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* @callback: Callback called with the XDomain message. Returning %1
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* here tells the XDomain core that the message was handled
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* by this handler and should not be forwared to other
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* handlers.
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* @data: Data passed with the callback
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* @list: Handlers are linked using this
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*
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* Thunderbolt services can hook into incoming XDomain requests by
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* registering protocol handler. Only limitation is that the XDomain
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* discovery protocol UUID cannot be registered since it is handled by
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* the core XDomain code.
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*
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* The @callback must check that the message is really directed to the
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* service the driver implements.
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*/
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struct tb_protocol_handler {
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const uuid_t *uuid;
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int (*callback)(const void *buf, size_t size, void *data);
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void *data;
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struct list_head list;
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};
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int tb_register_protocol_handler(struct tb_protocol_handler *handler);
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void tb_unregister_protocol_handler(struct tb_protocol_handler *handler);
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/**
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* struct tb_service - Thunderbolt service
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* @dev: XDomain device
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* @id: ID of the service (shown in sysfs)
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* @key: Protocol key from the properties directory
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* @prtcid: Protocol ID from the properties directory
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* @prtcvers: Protocol version from the properties directory
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* @prtcrevs: Protocol software revision from the properties directory
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* @prtcstns: Protocol settings mask from the properties directory
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* @debugfs_dir: Pointer to the service debugfs directory. Always created
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* when debugfs is enabled. Can be used by service drivers to
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* add their own entries under the service.
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*
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* Each domain exposes set of services it supports as collection of
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* properties. For each service there will be one corresponding
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* &struct tb_service. Service drivers are bound to these.
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*/
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struct tb_service {
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struct device dev;
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int id;
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const char *key;
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u32 prtcid;
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u32 prtcvers;
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u32 prtcrevs;
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u32 prtcstns;
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struct dentry *debugfs_dir;
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};
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static inline struct tb_service *tb_service_get(struct tb_service *svc)
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{
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if (svc)
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get_device(&svc->dev);
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return svc;
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}
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static inline void tb_service_put(struct tb_service *svc)
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{
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if (svc)
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put_device(&svc->dev);
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}
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static inline bool tb_is_service(const struct device *dev)
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{
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return dev->type == &tb_service_type;
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}
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static inline struct tb_service *tb_to_service(struct device *dev)
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{
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if (tb_is_service(dev))
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return container_of(dev, struct tb_service, dev);
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return NULL;
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}
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/**
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* tb_service_driver - Thunderbolt service driver
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* @driver: Driver structure
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* @probe: Called when the driver is probed
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* @remove: Called when the driver is removed (optional)
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* @shutdown: Called at shutdown time to stop the service (optional)
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* @id_table: Table of service identifiers the driver supports
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*/
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struct tb_service_driver {
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struct device_driver driver;
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int (*probe)(struct tb_service *svc, const struct tb_service_id *id);
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void (*remove)(struct tb_service *svc);
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void (*shutdown)(struct tb_service *svc);
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const struct tb_service_id *id_table;
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};
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#define TB_SERVICE(key, id) \
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.match_flags = TBSVC_MATCH_PROTOCOL_KEY | \
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TBSVC_MATCH_PROTOCOL_ID, \
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.protocol_key = (key), \
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.protocol_id = (id)
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int tb_register_service_driver(struct tb_service_driver *drv);
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void tb_unregister_service_driver(struct tb_service_driver *drv);
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static inline void *tb_service_get_drvdata(const struct tb_service *svc)
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{
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return dev_get_drvdata(&svc->dev);
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}
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static inline void tb_service_set_drvdata(struct tb_service *svc, void *data)
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{
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dev_set_drvdata(&svc->dev, data);
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}
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static inline struct tb_xdomain *tb_service_parent(struct tb_service *svc)
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{
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return tb_to_xdomain(svc->dev.parent);
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}
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/**
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* struct tb_nhi - thunderbolt native host interface
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* @lock: Must be held during ring creation/destruction. Is acquired by
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* interrupt_work when dispatching interrupts to individual rings.
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* @pdev: Pointer to the PCI device
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* @ops: NHI specific optional ops
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* @iobase: MMIO space of the NHI
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* @tx_rings: All Tx rings available on this host controller
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* @rx_rings: All Rx rings available on this host controller
|
|
* @msix_ida: Used to allocate MSI-X vectors for rings
|
|
* @going_away: The host controller device is about to disappear so when
|
|
* this flag is set, avoid touching the hardware anymore.
|
|
* @iommu_dma_protection: An IOMMU will isolate external-facing ports.
|
|
* @interrupt_work: Work scheduled to handle ring interrupt when no
|
|
* MSI-X is used.
|
|
* @hop_count: Number of rings (end point hops) supported by NHI.
|
|
* @quirks: NHI specific quirks if any
|
|
*/
|
|
struct tb_nhi {
|
|
spinlock_t lock;
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|
struct pci_dev *pdev;
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|
const struct tb_nhi_ops *ops;
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|
void __iomem *iobase;
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|
struct tb_ring **tx_rings;
|
|
struct tb_ring **rx_rings;
|
|
struct ida msix_ida;
|
|
bool going_away;
|
|
bool iommu_dma_protection;
|
|
struct work_struct interrupt_work;
|
|
u32 hop_count;
|
|
unsigned long quirks;
|
|
};
|
|
|
|
/**
|
|
* struct tb_ring - thunderbolt TX or RX ring associated with a NHI
|
|
* @lock: Lock serializing actions to this ring. Must be acquired after
|
|
* nhi->lock.
|
|
* @nhi: Pointer to the native host controller interface
|
|
* @size: Size of the ring
|
|
* @hop: Hop (DMA channel) associated with this ring
|
|
* @head: Head of the ring (write next descriptor here)
|
|
* @tail: Tail of the ring (complete next descriptor here)
|
|
* @descriptors: Allocated descriptors for this ring
|
|
* @queue: Queue holding frames to be transferred over this ring
|
|
* @in_flight: Queue holding frames that are currently in flight
|
|
* @work: Interrupt work structure
|
|
* @is_tx: Is the ring Tx or Rx
|
|
* @running: Is the ring running
|
|
* @irq: MSI-X irq number if the ring uses MSI-X. %0 otherwise.
|
|
* @vector: MSI-X vector number the ring uses (only set if @irq is > 0)
|
|
* @flags: Ring specific flags
|
|
* @e2e_tx_hop: Transmit HopID when E2E is enabled. Only applicable to
|
|
* RX ring. For TX ring this should be set to %0.
|
|
* @sof_mask: Bit mask used to detect start of frame PDF
|
|
* @eof_mask: Bit mask used to detect end of frame PDF
|
|
* @start_poll: Called when ring interrupt is triggered to start
|
|
* polling. Passing %NULL keeps the ring in interrupt mode.
|
|
* @poll_data: Data passed to @start_poll
|
|
*/
|
|
struct tb_ring {
|
|
spinlock_t lock;
|
|
struct tb_nhi *nhi;
|
|
int size;
|
|
int hop;
|
|
int head;
|
|
int tail;
|
|
struct ring_desc *descriptors;
|
|
dma_addr_t descriptors_dma;
|
|
struct list_head queue;
|
|
struct list_head in_flight;
|
|
struct work_struct work;
|
|
bool is_tx:1;
|
|
bool running:1;
|
|
int irq;
|
|
u8 vector;
|
|
unsigned int flags;
|
|
int e2e_tx_hop;
|
|
u16 sof_mask;
|
|
u16 eof_mask;
|
|
void (*start_poll)(void *data);
|
|
void *poll_data;
|
|
};
|
|
|
|
/* Leave ring interrupt enabled on suspend */
|
|
#define RING_FLAG_NO_SUSPEND BIT(0)
|
|
/* Configure the ring to be in frame mode */
|
|
#define RING_FLAG_FRAME BIT(1)
|
|
/* Enable end-to-end flow control */
|
|
#define RING_FLAG_E2E BIT(2)
|
|
|
|
struct ring_frame;
|
|
typedef void (*ring_cb)(struct tb_ring *, struct ring_frame *, bool canceled);
|
|
|
|
/**
|
|
* enum ring_desc_flags - Flags for DMA ring descriptor
|
|
* %RING_DESC_ISOCH: Enable isonchronous DMA (Tx only)
|
|
* %RING_DESC_CRC_ERROR: In frame mode CRC check failed for the frame (Rx only)
|
|
* %RING_DESC_COMPLETED: Descriptor completed (set by NHI)
|
|
* %RING_DESC_POSTED: Always set this
|
|
* %RING_DESC_BUFFER_OVERRUN: RX buffer overrun
|
|
* %RING_DESC_INTERRUPT: Request an interrupt on completion
|
|
*/
|
|
enum ring_desc_flags {
|
|
RING_DESC_ISOCH = 0x1,
|
|
RING_DESC_CRC_ERROR = 0x1,
|
|
RING_DESC_COMPLETED = 0x2,
|
|
RING_DESC_POSTED = 0x4,
|
|
RING_DESC_BUFFER_OVERRUN = 0x04,
|
|
RING_DESC_INTERRUPT = 0x8,
|
|
};
|
|
|
|
/**
|
|
* struct ring_frame - For use with ring_rx/ring_tx
|
|
* @buffer_phy: DMA mapped address of the frame
|
|
* @callback: Callback called when the frame is finished (optional)
|
|
* @list: Frame is linked to a queue using this
|
|
* @size: Size of the frame in bytes (%0 means %4096)
|
|
* @flags: Flags for the frame (see &enum ring_desc_flags)
|
|
* @eof: End of frame protocol defined field
|
|
* @sof: Start of frame protocol defined field
|
|
*/
|
|
struct ring_frame {
|
|
dma_addr_t buffer_phy;
|
|
ring_cb callback;
|
|
struct list_head list;
|
|
u32 size:12;
|
|
u32 flags:12;
|
|
u32 eof:4;
|
|
u32 sof:4;
|
|
};
|
|
|
|
/* Minimum size for ring_rx */
|
|
#define TB_FRAME_SIZE 0x100
|
|
|
|
struct tb_ring *tb_ring_alloc_tx(struct tb_nhi *nhi, int hop, int size,
|
|
unsigned int flags);
|
|
struct tb_ring *tb_ring_alloc_rx(struct tb_nhi *nhi, int hop, int size,
|
|
unsigned int flags, int e2e_tx_hop,
|
|
u16 sof_mask, u16 eof_mask,
|
|
void (*start_poll)(void *), void *poll_data);
|
|
void tb_ring_start(struct tb_ring *ring);
|
|
void tb_ring_stop(struct tb_ring *ring);
|
|
void tb_ring_free(struct tb_ring *ring);
|
|
|
|
int __tb_ring_enqueue(struct tb_ring *ring, struct ring_frame *frame);
|
|
|
|
/**
|
|
* tb_ring_rx() - enqueue a frame on an RX ring
|
|
* @ring: Ring to enqueue the frame
|
|
* @frame: Frame to enqueue
|
|
*
|
|
* @frame->buffer, @frame->buffer_phy have to be set. The buffer must
|
|
* contain at least %TB_FRAME_SIZE bytes.
|
|
*
|
|
* @frame->callback will be invoked with @frame->size, @frame->flags,
|
|
* @frame->eof, @frame->sof set once the frame has been received.
|
|
*
|
|
* If ring_stop() is called after the packet has been enqueued
|
|
* @frame->callback will be called with canceled set to true.
|
|
*
|
|
* Return: Returns %-ESHUTDOWN if ring_stop has been called. Zero otherwise.
|
|
*/
|
|
static inline int tb_ring_rx(struct tb_ring *ring, struct ring_frame *frame)
|
|
{
|
|
WARN_ON(ring->is_tx);
|
|
return __tb_ring_enqueue(ring, frame);
|
|
}
|
|
|
|
/**
|
|
* tb_ring_tx() - enqueue a frame on an TX ring
|
|
* @ring: Ring the enqueue the frame
|
|
* @frame: Frame to enqueue
|
|
*
|
|
* @frame->buffer, @frame->buffer_phy, @frame->size, @frame->eof and
|
|
* @frame->sof have to be set.
|
|
*
|
|
* @frame->callback will be invoked with once the frame has been transmitted.
|
|
*
|
|
* If ring_stop() is called after the packet has been enqueued @frame->callback
|
|
* will be called with canceled set to true.
|
|
*
|
|
* Return: Returns %-ESHUTDOWN if ring_stop has been called. Zero otherwise.
|
|
*/
|
|
static inline int tb_ring_tx(struct tb_ring *ring, struct ring_frame *frame)
|
|
{
|
|
WARN_ON(!ring->is_tx);
|
|
return __tb_ring_enqueue(ring, frame);
|
|
}
|
|
|
|
/* Used only when the ring is in polling mode */
|
|
struct ring_frame *tb_ring_poll(struct tb_ring *ring);
|
|
void tb_ring_poll_complete(struct tb_ring *ring);
|
|
|
|
/**
|
|
* tb_ring_dma_device() - Return device used for DMA mapping
|
|
* @ring: Ring whose DMA device is retrieved
|
|
*
|
|
* Use this function when you are mapping DMA for buffers that are
|
|
* passed to the ring for sending/receiving.
|
|
*/
|
|
static inline struct device *tb_ring_dma_device(struct tb_ring *ring)
|
|
{
|
|
return &ring->nhi->pdev->dev;
|
|
}
|
|
|
|
#endif /* THUNDERBOLT_H_ */
|