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thunderbolt.h
/* SPDX-License-Identifier: GPL-2.0 */ /* * Thunderbolt service API * * Copyright (C) 2014 Andreas Noever <andreas.noever@gmail.com> * Copyright (C) 2017, Intel Corporation * Authors: Michael Jamet <michael.jamet@intel.com> * Mika Westerberg <mika.westerberg@linux.intel.com> */ #ifndef THUNDERBOLT_H_ #define THUNDERBOLT_H_ #include <linux/device.h> #include <linux/idr.h> #include <linux/list.h> #include <linux/mutex.h> #include <linux/mod_devicetable.h> #include <linux/pci.h> #include <linux/uuid.h> #include <linux/workqueue.h> enum tb_cfg_pkg_type { TB_CFG_PKG_READ = 1, TB_CFG_PKG_WRITE = 2, TB_CFG_PKG_ERROR = 3, TB_CFG_PKG_NOTIFY_ACK = 4, TB_CFG_PKG_EVENT = 5, TB_CFG_PKG_XDOMAIN_REQ = 6, TB_CFG_PKG_XDOMAIN_RESP = 7, TB_CFG_PKG_OVERRIDE = 8, TB_CFG_PKG_RESET = 9, TB_CFG_PKG_ICM_EVENT = 10, TB_CFG_PKG_ICM_CMD = 11, TB_CFG_PKG_ICM_RESP = 12, TB_CFG_PKG_PREPARE_TO_SLEEP = 13, }; /** * enum tb_security_level - Thunderbolt security level * @TB_SECURITY_NONE: No security, legacy mode * @TB_SECURITY_USER: User approval required at minimum * @TB_SECURITY_SECURE: One time saved key required at minimum * @TB_SECURITY_DPONLY: Only tunnel Display port (and USB) * @TB_SECURITY_USBONLY: Only tunnel USB controller of the connected * Thunderbolt dock (and Display Port). All PCIe * links downstream of the dock are removed. * @TB_SECURITY_NOPCIE: For USB4 systems this level is used when the * PCIe tunneling is disabled from the BIOS. */ enum tb_security_level { TB_SECURITY_NONE, TB_SECURITY_USER, TB_SECURITY_SECURE, TB_SECURITY_DPONLY, TB_SECURITY_USBONLY, TB_SECURITY_NOPCIE, }; /** * struct tb - main thunderbolt bus structure * @dev: Domain device * @lock: Big lock. Must be held when accessing any struct * tb_switch / struct tb_port. * @nhi: Pointer to the NHI structure * @ctl: Control channel for this domain * @wq: Ordered workqueue for all domain specific work * @root_switch: Root switch of this domain * @cm_ops: Connection manager specific operations vector * @index: Linux assigned domain number * @security_level: Current security level * @nboot_acl: Number of boot ACLs the domain supports * @privdata: Private connection manager specific data */ struct tb { struct device dev; struct mutex lock; struct tb_nhi *nhi; struct tb_ctl *ctl; struct workqueue_struct *wq; struct tb_switch *root_switch; const struct tb_cm_ops *cm_ops; int index; enum tb_security_level security_level; size_t nboot_acl; unsigned long privdata[]; }; extern const struct bus_type tb_bus_type; extern struct device_type tb_service_type; extern struct device_type tb_xdomain_type; #define TB_LINKS_PER_PHY_PORT 2 static inline unsigned int tb_phy_port_from_link(unsigned int link) { return (link - 1) / TB_LINKS_PER_PHY_PORT; } /** * struct tb_property_dir - XDomain property directory * @uuid: Directory UUID or %NULL if root directory * @properties: List of properties in this directory * * User needs to provide serialization if needed. */ struct tb_property_dir { const uuid_t *uuid; struct list_head properties; }; enum tb_property_type { TB_PROPERTY_TYPE_UNKNOWN = 0x00, TB_PROPERTY_TYPE_DIRECTORY = 0x44, TB_PROPERTY_TYPE_DATA = 0x64, TB_PROPERTY_TYPE_TEXT = 0x74, TB_PROPERTY_TYPE_VALUE = 0x76, }; #define TB_PROPERTY_KEY_SIZE 8 /** * struct tb_property - XDomain property * @list: Used to link properties together in a directory * @key: Key for the property (always terminated). * @type: Type of the property * @length: Length of the property data in dwords * @value: Property value * * Users use @type to determine which field in @value is filled. */ struct tb_property { struct list_head list; char key[TB_PROPERTY_KEY_SIZE + 1]; enum tb_property_type type; size_t length; union { struct tb_property_dir *dir; u8 *data; char *text; u32 immediate; } value; }; struct tb_property_dir *tb_property_parse_dir(const u32 *block, size_t block_len); ssize_t tb_property_format_dir(const struct tb_property_dir *dir, u32 *block, size_t block_len); struct tb_property_dir *tb_property_copy_dir(const struct tb_property_dir *dir); struct tb_property_dir *tb_property_create_dir(const uuid_t *uuid); void tb_property_free_dir(struct tb_property_dir *dir); int tb_property_add_immediate(struct tb_property_dir *parent, const char *key, u32 value); int tb_property_add_data(struct tb_property_dir *parent, const char *key, const void *buf, size_t buflen); int tb_property_add_text(struct tb_property_dir *parent, const char *key, const char *text); int tb_property_add_dir(struct tb_property_dir *parent, const char *key, struct tb_property_dir *dir); void tb_property_remove(struct tb_property *tb_property); struct tb_property *tb_property_find(struct tb_property_dir *dir, const char *key, enum tb_property_type type); struct tb_property *tb_property_get_next(struct tb_property_dir *dir, struct tb_property *prev); #define tb_property_for_each(dir, property) \ for (property = tb_property_get_next(dir, NULL); \ property; \ property = tb_property_get_next(dir, property)) int tb_register_property_dir(const char *key, struct tb_property_dir *dir); void tb_unregister_property_dir(const char *key, struct tb_property_dir *dir); /** * enum tb_link_width - Thunderbolt/USB4 link width * @TB_LINK_WIDTH_SINGLE: Single lane link * @TB_LINK_WIDTH_DUAL: Dual lane symmetric link * @TB_LINK_WIDTH_ASYM_TX: Dual lane asymmetric Gen 4 link with 3 transmitters * @TB_LINK_WIDTH_ASYM_RX: Dual lane asymmetric Gen 4 link with 3 receivers */ enum tb_link_width { TB_LINK_WIDTH_SINGLE = BIT(0), TB_LINK_WIDTH_DUAL = BIT(1), TB_LINK_WIDTH_ASYM_TX = BIT(2), TB_LINK_WIDTH_ASYM_RX = BIT(3), }; /** * struct tb_xdomain - Cross-domain (XDomain) connection * @dev: XDomain device * @tb: Pointer to the domain * @remote_uuid: UUID of the remote domain (host) * @local_uuid: Cached local UUID * @route: Route string the other domain can be reached * @vendor: Vendor ID of the remote domain * @device: Device ID of the demote domain * @local_max_hopid: Maximum input HopID of this host * @remote_max_hopid: Maximum input HopID of the remote host * @lock: Lock to serialize access to the following fields of this structure * @vendor_name: Name of the vendor (or %NULL if not known) * @device_name: Name of the device (or %NULL if not known) * @link_speed: Speed of the link in Gb/s * @link_width: Width of the downstream facing link * @link_usb4: Downstream link is USB4 * @is_unplugged: The XDomain is unplugged * @needs_uuid: If the XDomain does not have @remote_uuid it will be * queried first * @service_ids: Used to generate IDs for the services * @in_hopids: Input HopIDs for DMA tunneling * @out_hopids; Output HopIDs for DMA tunneling * @local_property_block: Local block of properties * @local_property_block_gen: Generation of @local_property_block * @local_property_block_len: Length of the @local_property_block in dwords * @remote_properties: Properties exported by the remote domain * @remote_property_block_gen: Generation of @remote_properties * @state: Next XDomain discovery state to run * @state_work: Work used to run the next state * @state_retries: Number of retries remain for the state * @properties_changed_work: Work used to notify the remote domain that * our properties have changed * @properties_changed_retries: Number of times left to send properties * changed notification * @bonding_possible: True if lane bonding is possible on local side * @target_link_width: Target link width from the remote host * @link: Root switch link the remote domain is connected (ICM only) * @depth: Depth in the chain the remote domain is connected (ICM only) * * This structure represents connection across two domains (hosts). * Each XDomain contains zero or more services which are exposed as * &struct tb_service objects. * * Service drivers may access this structure if they need to enumerate * non-standard properties but they need hold @lock when doing so * because properties can be changed asynchronously in response to * changes in the remote domain. */ struct tb_xdomain { struct device dev; struct tb *tb; uuid_t *remote_uuid; const uuid_t *local_uuid; u64 route; u16 vendor; u16 device; unsigned int local_max_hopid; unsigned int remote_max_hopid; struct mutex lock; const char *vendor_name; const char *device_name; unsigned int link_speed; enum tb_link_width link_width; bool link_usb4; bool is_unplugged; bool needs_uuid; struct ida service_ids; struct ida in_hopids; struct ida out_hopids; u32 *local_property_block; u32 local_property_block_gen; u32 local_property_block_len; struct tb_property_dir *remote_properties; u32 remote_property_block_gen; int state; struct delayed_work state_work; int state_retries; struct delayed_work properties_changed_work; int properties_changed_retries; bool bonding_possible; u8 target_link_width; u8 link; u8 depth; }; int tb_xdomain_lane_bonding_enable(struct tb_xdomain *xd); void tb_xdomain_lane_bonding_disable(struct tb_xdomain *xd); int tb_xdomain_alloc_in_hopid(struct tb_xdomain *xd, int hopid); void tb_xdomain_release_in_hopid(struct tb_xdomain *xd, int hopid); int tb_xdomain_alloc_out_hopid(struct tb_xdomain *xd, int hopid); void tb_xdomain_release_out_hopid(struct tb_xdomain *xd, int hopid); int tb_xdomain_enable_paths(struct tb_xdomain *xd, int transmit_path, int transmit_ring, int receive_path, int receive_ring); int tb_xdomain_disable_paths(struct tb_xdomain *xd, int transmit_path, int transmit_ring, int receive_path, int receive_ring); static inline int tb_xdomain_disable_all_paths(struct tb_xdomain *xd) { return tb_xdomain_disable_paths(xd, -1, -1, -1, -1); } struct tb_xdomain *tb_xdomain_find_by_uuid(struct tb *tb, const uuid_t *uuid); struct tb_xdomain *tb_xdomain_find_by_route(struct tb *tb, u64 route); static inline struct tb_xdomain * tb_xdomain_find_by_uuid_locked(struct tb *tb, const uuid_t *uuid) { struct tb_xdomain *xd; mutex_lock(&tb->lock); xd = tb_xdomain_find_by_uuid(tb, uuid); mutex_unlock(&tb->lock); return xd; } static inline struct tb_xdomain * tb_xdomain_find_by_route_locked(struct tb *tb, u64 route) { struct tb_xdomain *xd; mutex_lock(&tb->lock); xd = tb_xdomain_find_by_route(tb, route); mutex_unlock(&tb->lock); return xd; } static inline struct tb_xdomain *tb_xdomain_get(struct tb_xdomain *xd) { if (xd) get_device(&xd->dev); return xd; } static inline void tb_xdomain_put(struct tb_xdomain *xd) { if (xd) put_device(&xd->dev); } static inline bool tb_is_xdomain(const struct device *dev) { return dev->type == &tb_xdomain_type; } static inline struct tb_xdomain *tb_to_xdomain(struct device *dev) { if (tb_is_xdomain(dev)) return container_of(dev, struct tb_xdomain, dev); return NULL; } int tb_xdomain_response(struct tb_xdomain *xd, const void *response, size_t size, enum tb_cfg_pkg_type type); int tb_xdomain_request(struct tb_xdomain *xd, const void *request, size_t request_size, enum tb_cfg_pkg_type request_type, void *response, size_t response_size, enum tb_cfg_pkg_type response_type, unsigned int timeout_msec); /** * tb_protocol_handler - Protocol specific handler * @uuid: XDomain messages with this UUID are dispatched to this handler * @callback: Callback called with the XDomain message. Returning %1 * here tells the XDomain core that the message was handled * by this handler and should not be forwared to other * handlers. * @data: Data passed with the callback * @list: Handlers are linked using this * * Thunderbolt services can hook into incoming XDomain requests by * registering protocol handler. Only limitation is that the XDomain * discovery protocol UUID cannot be registered since it is handled by * the core XDomain code. * * The @callback must check that the message is really directed to the * service the driver implements. */ struct tb_protocol_handler { const uuid_t *uuid; int (*callback)(const void *buf, size_t size, void *data); void *data; struct list_head list; }; int tb_register_protocol_handler(struct tb_protocol_handler *handler); void tb_unregister_protocol_handler(struct tb_protocol_handler *handler); /** * struct tb_service - Thunderbolt service * @dev: XDomain device * @id: ID of the service (shown in sysfs) * @key: Protocol key from the properties directory * @prtcid: Protocol ID from the properties directory * @prtcvers: Protocol version from the properties directory * @prtcrevs: Protocol software revision from the properties directory * @prtcstns: Protocol settings mask from the properties directory * @debugfs_dir: Pointer to the service debugfs directory. Always created * when debugfs is enabled. Can be used by service drivers to * add their own entries under the service. * * Each domain exposes set of services it supports as collection of * properties. For each service there will be one corresponding * &struct tb_service. Service drivers are bound to these. */ struct tb_service { struct device dev; int id; const char *key; u32 prtcid; u32 prtcvers; u32 prtcrevs; u32 prtcstns; struct dentry *debugfs_dir; }; static inline struct tb_service *tb_service_get(struct tb_service *svc) { if (svc) get_device(&svc->dev); return svc; } static inline void tb_service_put(struct tb_service *svc) { if (svc) put_device(&svc->dev); } static inline bool tb_is_service(const struct device *dev) { return dev->type == &tb_service_type; } static inline struct tb_service *tb_to_service(struct device *dev) { if (tb_is_service(dev)) return container_of(dev, struct tb_service, dev); return NULL; } /** * tb_service_driver - Thunderbolt service driver * @driver: Driver structure * @probe: Called when the driver is probed * @remove: Called when the driver is removed (optional) * @shutdown: Called at shutdown time to stop the service (optional) * @id_table: Table of service identifiers the driver supports */ struct tb_service_driver { struct device_driver driver; int (*probe)(struct tb_service *svc, const struct tb_service_id *id); void (*remove)(struct tb_service *svc); void (*shutdown)(struct tb_service *svc); const struct tb_service_id *id_table; }; #define TB_SERVICE(key, id) \ .match_flags = TBSVC_MATCH_PROTOCOL_KEY | \ TBSVC_MATCH_PROTOCOL_ID, \ .protocol_key = (key), \ .protocol_id = (id) int tb_register_service_driver(struct tb_service_driver *drv); void tb_unregister_service_driver(struct tb_service_driver *drv); static inline void *tb_service_get_drvdata(const struct tb_service *svc) { return dev_get_drvdata(&svc->dev); } static inline void tb_service_set_drvdata(struct tb_service *svc, void *data) { dev_set_drvdata(&svc->dev, data); } static inline struct tb_xdomain *tb_service_parent(struct tb_service *svc) { return tb_to_xdomain(svc->dev.parent); } /** * struct tb_nhi - thunderbolt native host interface * @lock: Must be held during ring creation/destruction. Is acquired by * interrupt_work when dispatching interrupts to individual rings. * @pdev: Pointer to the PCI device * @ops: NHI specific optional ops * @iobase: MMIO space of the NHI * @tx_rings: All Tx rings available on this host controller * @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; struct pci_dev *pdev; const struct tb_nhi_ops *ops; void __iomem *iobase; 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_ */
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