// SPDX-License-Identifier: GPL-2.0 /* * xHCI host controller driver * * Copyright (C) 2008 Intel Corp. * * Author: Sarah Sharp * Some code borrowed from the Linux EHCI driver. */ /* * Ring initialization rules: * 1. Each segment is initialized to zero, except for link TRBs. * 2. Ring cycle state = 0. This represents Producer Cycle State (PCS) or * Consumer Cycle State (CCS), depending on ring function. * 3. Enqueue pointer = dequeue pointer = address of first TRB in the segment. * * Ring behavior rules: * 1. A ring is empty if enqueue == dequeue. This means there will always be at * least one free TRB in the ring. This is useful if you want to turn that * into a link TRB and expand the ring. * 2. When incrementing an enqueue or dequeue pointer, if the next TRB is a * link TRB, then load the pointer with the address in the link TRB. If the * link TRB had its toggle bit set, you may need to update the ring cycle * state (see cycle bit rules). You may have to do this multiple times * until you reach a non-link TRB. * 3. A ring is full if enqueue++ (for the definition of increment above) * equals the dequeue pointer. * * Cycle bit rules: * 1. When a consumer increments a dequeue pointer and encounters a toggle bit * in a link TRB, it must toggle the ring cycle state. * 2. When a producer increments an enqueue pointer and encounters a toggle bit * in a link TRB, it must toggle the ring cycle state. * * Producer rules: * 1. Check if ring is full before you enqueue. * 2. Write the ring cycle state to the cycle bit in the TRB you're enqueuing. * Update enqueue pointer between each write (which may update the ring * cycle state). * 3. Notify consumer. If SW is producer, it rings the doorbell for command * and endpoint rings. If HC is the producer for the event ring, * and it generates an interrupt according to interrupt modulation rules. * * Consumer rules: * 1. Check if TRB belongs to you. If the cycle bit == your ring cycle state, * the TRB is owned by the consumer. * 2. Update dequeue pointer (which may update the ring cycle state) and * continue processing TRBs until you reach a TRB which is not owned by you. * 3. Notify the producer. SW is the consumer for the event ring, and it * updates event ring dequeue pointer. HC is the consumer for the command and * endpoint rings; it generates events on the event ring for these. */ #include <linux/scatterlist.h> #include <linux/slab.h> #include <linux/dma-mapping.h> #include "xhci.h" #include "xhci-trace.h" static int queue_command(struct xhci_hcd *xhci, struct xhci_command *cmd, u32 field1, u32 field2, u32 field3, u32 field4, bool command_must_succeed); /* * Returns zero if the TRB isn't in this segment, otherwise it returns the DMA * address of the TRB. */ dma_addr_t xhci_trb_virt_to_dma(struct xhci_segment *seg, union xhci_trb *trb) { … } static bool trb_is_noop(union xhci_trb *trb) { … } static bool trb_is_link(union xhci_trb *trb) { … } static bool last_trb_on_seg(struct xhci_segment *seg, union xhci_trb *trb) { … } static bool last_trb_on_ring(struct xhci_ring *ring, struct xhci_segment *seg, union xhci_trb *trb) { … } static bool link_trb_toggles_cycle(union xhci_trb *trb) { … } static bool last_td_in_urb(struct xhci_td *td) { … } static bool unhandled_event_trb(struct xhci_ring *ring) { … } static void inc_td_cnt(struct urb *urb) { … } static void trb_to_noop(union xhci_trb *trb, u32 noop_type) { … } /* Updates trb to point to the next TRB in the ring, and updates seg if the next * TRB is in a new segment. This does not skip over link TRBs, and it does not * effect the ring dequeue or enqueue pointers. */ static void next_trb(struct xhci_hcd *xhci, struct xhci_ring *ring, struct xhci_segment **seg, union xhci_trb **trb) { … } /* * See Cycle bit rules. SW is the consumer for the event ring only. */ void inc_deq(struct xhci_hcd *xhci, struct xhci_ring *ring) { … } /* * See Cycle bit rules. SW is the consumer for the event ring only. * * If we've just enqueued a TRB that is in the middle of a TD (meaning the * chain bit is set), then set the chain bit in all the following link TRBs. * If we've enqueued the last TRB in a TD, make sure the following link TRBs * have their chain bit cleared (so that each Link TRB is a separate TD). * * Section 6.4.4.1 of the 0.95 spec says link TRBs cannot have the chain bit * set, but other sections talk about dealing with the chain bit set. This was * fixed in the 0.96 specification errata, but we have to assume that all 0.95 * xHCI hardware can't handle the chain bit being cleared on a link TRB. * * @more_trbs_coming: Will you enqueue more TRBs before calling * prepare_transfer()? */ static void inc_enq(struct xhci_hcd *xhci, struct xhci_ring *ring, bool more_trbs_coming) { … } /* * Return number of free normal TRBs from enqueue to dequeue pointer on ring. * Not counting an assumed link TRB at end of each TRBS_PER_SEGMENT sized segment. * Only for transfer and command rings where driver is the producer, not for * event rings. */ static unsigned int xhci_num_trbs_free(struct xhci_ring *ring) { … } /* * Check to see if there's room to enqueue num_trbs on the ring and make sure * enqueue pointer will not advance into dequeue segment. See rules above. * return number of new segments needed to ensure this. */ static unsigned int xhci_ring_expansion_needed(struct xhci_hcd *xhci, struct xhci_ring *ring, unsigned int num_trbs) { … } /* Ring the host controller doorbell after placing a command on the ring */ void xhci_ring_cmd_db(struct xhci_hcd *xhci) { … } static bool xhci_mod_cmd_timer(struct xhci_hcd *xhci) { … } static struct xhci_command *xhci_next_queued_cmd(struct xhci_hcd *xhci) { … } /* * Turn all commands on command ring with status set to "aborted" to no-op trbs. * If there are other commands waiting then restart the ring and kick the timer. * This must be called with command ring stopped and xhci->lock held. */ static void xhci_handle_stopped_cmd_ring(struct xhci_hcd *xhci, struct xhci_command *cur_cmd) { … } /* Must be called with xhci->lock held, releases and aquires lock back */ static int xhci_abort_cmd_ring(struct xhci_hcd *xhci, unsigned long flags) { … } void xhci_ring_ep_doorbell(struct xhci_hcd *xhci, unsigned int slot_id, unsigned int ep_index, unsigned int stream_id) { … } /* Ring the doorbell for any rings with pending URBs */ static void ring_doorbell_for_active_rings(struct xhci_hcd *xhci, unsigned int slot_id, unsigned int ep_index) { … } void xhci_ring_doorbell_for_active_rings(struct xhci_hcd *xhci, unsigned int slot_id, unsigned int ep_index) { … } static struct xhci_virt_ep *xhci_get_virt_ep(struct xhci_hcd *xhci, unsigned int slot_id, unsigned int ep_index) { … } static struct xhci_ring *xhci_virt_ep_to_ring(struct xhci_hcd *xhci, struct xhci_virt_ep *ep, unsigned int stream_id) { … } /* Get the right ring for the given slot_id, ep_index and stream_id. * If the endpoint supports streams, boundary check the URB's stream ID. * If the endpoint doesn't support streams, return the singular endpoint ring. */ struct xhci_ring *xhci_triad_to_transfer_ring(struct xhci_hcd *xhci, unsigned int slot_id, unsigned int ep_index, unsigned int stream_id) { … } /* * Get the hw dequeue pointer xHC stopped on, either directly from the * endpoint context, or if streams are in use from the stream context. * The returned hw_dequeue contains the lowest four bits with cycle state * and possbile stream context type. */ static u64 xhci_get_hw_deq(struct xhci_hcd *xhci, struct xhci_virt_device *vdev, unsigned int ep_index, unsigned int stream_id) { … } static int xhci_move_dequeue_past_td(struct xhci_hcd *xhci, unsigned int slot_id, unsigned int ep_index, unsigned int stream_id, struct xhci_td *td) { … } /* flip_cycle means flip the cycle bit of all but the first and last TRB. * (The last TRB actually points to the ring enqueue pointer, which is not part * of this TD.) This is used to remove partially enqueued isoc TDs from a ring. */ static void td_to_noop(struct xhci_hcd *xhci, struct xhci_ring *ep_ring, struct xhci_td *td, bool flip_cycle) { … } static void xhci_giveback_urb_in_irq(struct xhci_hcd *xhci, struct xhci_td *cur_td, int status) { … } static void xhci_unmap_td_bounce_buffer(struct xhci_hcd *xhci, struct xhci_ring *ring, struct xhci_td *td) { … } static int xhci_td_cleanup(struct xhci_hcd *xhci, struct xhci_td *td, struct xhci_ring *ep_ring, int status) { … } /* Complete the cancelled URBs we unlinked from td_list. */ static void xhci_giveback_invalidated_tds(struct xhci_virt_ep *ep) { … } static int xhci_reset_halted_ep(struct xhci_hcd *xhci, unsigned int slot_id, unsigned int ep_index, enum xhci_ep_reset_type reset_type) { … } static int xhci_handle_halted_endpoint(struct xhci_hcd *xhci, struct xhci_virt_ep *ep, struct xhci_td *td, enum xhci_ep_reset_type reset_type) { … } /* * Fix up the ep ring first, so HW stops executing cancelled TDs. * We have the xHCI lock, so nothing can modify this list until we drop it. * We're also in the event handler, so we can't get re-interrupted if another * Stop Endpoint command completes. * * only call this when ring is not in a running state */ static int xhci_invalidate_cancelled_tds(struct xhci_virt_ep *ep) { … } /* * Returns the TD the endpoint ring halted on. * Only call for non-running rings without streams. */ static struct xhci_td *find_halted_td(struct xhci_virt_ep *ep) { … } /* * When we get a command completion for a Stop Endpoint Command, we need to * unlink any cancelled TDs from the ring. There are two ways to do that: * * 1. If the HW was in the middle of processing the TD that needs to be * cancelled, then we must move the ring's dequeue pointer past the last TRB * in the TD with a Set Dequeue Pointer Command. * 2. Otherwise, we turn all the TRBs in the TD into No-op TRBs (with the chain * bit cleared) so that the HW will skip over them. */ static void xhci_handle_cmd_stop_ep(struct xhci_hcd *xhci, int slot_id, union xhci_trb *trb, u32 comp_code) { … } static void xhci_kill_ring_urbs(struct xhci_hcd *xhci, struct xhci_ring *ring) { … } static void xhci_kill_endpoint_urbs(struct xhci_hcd *xhci, int slot_id, int ep_index) { … } /* * host controller died, register read returns 0xffffffff * Complete pending commands, mark them ABORTED. * URBs need to be given back as usb core might be waiting with device locks * held for the URBs to finish during device disconnect, blocking host remove. * * Call with xhci->lock held. * lock is relased and re-acquired while giving back urb. */ void xhci_hc_died(struct xhci_hcd *xhci) { … } static void update_ring_for_set_deq_completion(struct xhci_hcd *xhci, struct xhci_virt_device *dev, struct xhci_ring *ep_ring, unsigned int ep_index) { … } /* * When we get a completion for a Set Transfer Ring Dequeue Pointer command, * we need to clear the set deq pending flag in the endpoint ring state, so that * the TD queueing code can ring the doorbell again. We also need to ring the * endpoint doorbell to restart the ring, but only if there aren't more * cancellations pending. */ static void xhci_handle_cmd_set_deq(struct xhci_hcd *xhci, int slot_id, union xhci_trb *trb, u32 cmd_comp_code) { … } static void xhci_handle_cmd_reset_ep(struct xhci_hcd *xhci, int slot_id, union xhci_trb *trb, u32 cmd_comp_code) { … } static void xhci_handle_cmd_enable_slot(int slot_id, struct xhci_command *command, u32 cmd_comp_code) { … } static void xhci_handle_cmd_disable_slot(struct xhci_hcd *xhci, int slot_id) { … } static void xhci_handle_cmd_config_ep(struct xhci_hcd *xhci, int slot_id) { … } static void xhci_handle_cmd_addr_dev(struct xhci_hcd *xhci, int slot_id) { … } static void xhci_handle_cmd_reset_dev(struct xhci_hcd *xhci, int slot_id) { … } static void xhci_handle_cmd_nec_get_fw(struct xhci_hcd *xhci, struct xhci_event_cmd *event) { … } static void xhci_complete_del_and_free_cmd(struct xhci_command *cmd, u32 status) { … } void xhci_cleanup_command_queue(struct xhci_hcd *xhci) { … } void xhci_handle_command_timeout(struct work_struct *work) { … } static void handle_cmd_completion(struct xhci_hcd *xhci, struct xhci_event_cmd *event) { … } static void handle_vendor_event(struct xhci_hcd *xhci, union xhci_trb *event, u32 trb_type) { … } static void handle_device_notification(struct xhci_hcd *xhci, union xhci_trb *event) { … } /* * Quirk hanlder for errata seen on Cavium ThunderX2 processor XHCI * Controller. * As per ThunderX2errata-129 USB 2 device may come up as USB 1 * If a connection to a USB 1 device is followed by another connection * to a USB 2 device. * * Reset the PHY after the USB device is disconnected if device speed * is less than HCD_USB3. * Retry the reset sequence max of 4 times checking the PLL lock status. * */ static void xhci_cavium_reset_phy_quirk(struct xhci_hcd *xhci) { … } static void handle_port_status(struct xhci_hcd *xhci, union xhci_trb *event) { … } /* * If the suspect DMA address is a TRB in this TD, this function returns that * TRB's segment. Otherwise it returns 0. */ struct xhci_segment *trb_in_td(struct xhci_hcd *xhci, struct xhci_td *td, dma_addr_t suspect_dma, bool debug) { … } static void xhci_clear_hub_tt_buffer(struct xhci_hcd *xhci, struct xhci_td *td, struct xhci_virt_ep *ep) { … } /* * Check if xhci internal endpoint state has gone to a "halt" state due to an * error or stall, including default control pipe protocol stall. * The internal halt needs to be cleared with a reset endpoint command. * * External device side is also halted in functional stall cases. Class driver * will clear the device halt with a CLEAR_FEATURE(ENDPOINT_HALT) request later. */ static bool xhci_halted_host_endpoint(struct xhci_ep_ctx *ep_ctx, unsigned int comp_code) { … } int xhci_is_vendor_info_code(struct xhci_hcd *xhci, unsigned int trb_comp_code) { … } static int finish_td(struct xhci_hcd *xhci, struct xhci_virt_ep *ep, struct xhci_ring *ep_ring, struct xhci_td *td, u32 trb_comp_code) { … } /* sum trb lengths from ring dequeue up to stop_trb, _excluding_ stop_trb */ static int sum_trb_lengths(struct xhci_hcd *xhci, struct xhci_ring *ring, union xhci_trb *stop_trb) { … } /* * Process control tds, update urb status and actual_length. */ static int process_ctrl_td(struct xhci_hcd *xhci, struct xhci_virt_ep *ep, struct xhci_ring *ep_ring, struct xhci_td *td, union xhci_trb *ep_trb, struct xhci_transfer_event *event) { … } /* * Process isochronous tds, update urb packet status and actual_length. */ static int process_isoc_td(struct xhci_hcd *xhci, struct xhci_virt_ep *ep, struct xhci_ring *ep_ring, struct xhci_td *td, union xhci_trb *ep_trb, struct xhci_transfer_event *event) { … } static int skip_isoc_td(struct xhci_hcd *xhci, struct xhci_td *td, struct xhci_virt_ep *ep, int status) { … } /* * Process bulk and interrupt tds, update urb status and actual_length. */ static int process_bulk_intr_td(struct xhci_hcd *xhci, struct xhci_virt_ep *ep, struct xhci_ring *ep_ring, struct xhci_td *td, union xhci_trb *ep_trb, struct xhci_transfer_event *event) { … } /* Transfer events which don't point to a transfer TRB, see xhci 4.17.4 */ static int handle_transferless_tx_event(struct xhci_hcd *xhci, struct xhci_virt_ep *ep, u32 trb_comp_code) { … } /* * If this function returns an error condition, it means it got a Transfer * event with a corrupted Slot ID, Endpoint ID, or TRB DMA address. * At this point, the host controller is probably hosed and should be reset. */ static int handle_tx_event(struct xhci_hcd *xhci, struct xhci_interrupter *ir, struct xhci_transfer_event *event) { … } /* * This function handles one OS-owned event on the event ring. It may drop * xhci->lock between event processing (e.g. to pass up port status changes). */ static int xhci_handle_event_trb(struct xhci_hcd *xhci, struct xhci_interrupter *ir, union xhci_trb *event) { … } /* * Update Event Ring Dequeue Pointer: * - When all events have finished * - To avoid "Event Ring Full Error" condition */ static void xhci_update_erst_dequeue(struct xhci_hcd *xhci, struct xhci_interrupter *ir, bool clear_ehb) { … } /* Clear the interrupt pending bit for a specific interrupter. */ static void xhci_clear_interrupt_pending(struct xhci_interrupter *ir) { … } /* * Handle all OS-owned events on an interrupter event ring. It may drop * and reaquire xhci->lock between event processing. */ static int xhci_handle_events(struct xhci_hcd *xhci, struct xhci_interrupter *ir) { … } /* * xHCI spec says we can get an interrupt, and if the HC has an error condition, * we might get bad data out of the event ring. Section 4.10.2.7 has a list of * indicators of an event TRB error, but we check the status *first* to be safe. */ irqreturn_t xhci_irq(struct usb_hcd *hcd) { … } irqreturn_t xhci_msi_irq(int irq, void *hcd) { … } EXPORT_SYMBOL_GPL(…); /**** Endpoint Ring Operations ****/ /* * Generic function for queueing a TRB on a ring. * The caller must have checked to make sure there's room on the ring. * * @more_trbs_coming: Will you enqueue more TRBs before calling * prepare_transfer()? */ static void queue_trb(struct xhci_hcd *xhci, struct xhci_ring *ring, bool more_trbs_coming, u32 field1, u32 field2, u32 field3, u32 field4) { … } /* * Does various checks on the endpoint ring, and makes it ready to queue num_trbs. * expand ring if it start to be full. */ static int prepare_ring(struct xhci_hcd *xhci, struct xhci_ring *ep_ring, u32 ep_state, unsigned int num_trbs, gfp_t mem_flags) { … } static int prepare_transfer(struct xhci_hcd *xhci, struct xhci_virt_device *xdev, unsigned int ep_index, unsigned int stream_id, unsigned int num_trbs, struct urb *urb, unsigned int td_index, gfp_t mem_flags) { … } unsigned int count_trbs(u64 addr, u64 len) { … } static inline unsigned int count_trbs_needed(struct urb *urb) { … } static unsigned int count_sg_trbs_needed(struct urb *urb) { … } static unsigned int count_isoc_trbs_needed(struct urb *urb, int i) { … } static void check_trb_math(struct urb *urb, int running_total) { … } static void giveback_first_trb(struct xhci_hcd *xhci, int slot_id, unsigned int ep_index, unsigned int stream_id, int start_cycle, struct xhci_generic_trb *start_trb) { … } static void check_interval(struct urb *urb, struct xhci_ep_ctx *ep_ctx) { … } /* * xHCI uses normal TRBs for both bulk and interrupt. When the interrupt * endpoint is to be serviced, the xHC will consume (at most) one TD. A TD * (comprised of sg list entries) can take several service intervals to * transmit. */ int xhci_queue_intr_tx(struct xhci_hcd *xhci, gfp_t mem_flags, struct urb *urb, int slot_id, unsigned int ep_index) { … } /* * For xHCI 1.0 host controllers, TD size is the number of max packet sized * packets remaining in the TD (*not* including this TRB). * * Total TD packet count = total_packet_count = * DIV_ROUND_UP(TD size in bytes / wMaxPacketSize) * * Packets transferred up to and including this TRB = packets_transferred = * rounddown(total bytes transferred including this TRB / wMaxPacketSize) * * TD size = total_packet_count - packets_transferred * * For xHCI 0.96 and older, TD size field should be the remaining bytes * including this TRB, right shifted by 10 * * For all hosts it must fit in bits 21:17, so it can't be bigger than 31. * This is taken care of in the TRB_TD_SIZE() macro * * The last TRB in a TD must have the TD size set to zero. */ static u32 xhci_td_remainder(struct xhci_hcd *xhci, int transferred, int trb_buff_len, unsigned int td_total_len, struct urb *urb, bool more_trbs_coming) { … } static int xhci_align_td(struct xhci_hcd *xhci, struct urb *urb, u32 enqd_len, u32 *trb_buff_len, struct xhci_segment *seg) { … } /* This is very similar to what ehci-q.c qtd_fill() does */ int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags, struct urb *urb, int slot_id, unsigned int ep_index) { … } /* Caller must have locked xhci->lock */ int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags, struct urb *urb, int slot_id, unsigned int ep_index) { … } /* * The transfer burst count field of the isochronous TRB defines the number of * bursts that are required to move all packets in this TD. Only SuperSpeed * devices can burst up to bMaxBurst number of packets per service interval. * This field is zero based, meaning a value of zero in the field means one * burst. Basically, for everything but SuperSpeed devices, this field will be * zero. Only xHCI 1.0 host controllers support this field. */ static unsigned int xhci_get_burst_count(struct xhci_hcd *xhci, struct urb *urb, unsigned int total_packet_count) { … } /* * Returns the number of packets in the last "burst" of packets. This field is * valid for all speeds of devices. USB 2.0 devices can only do one "burst", so * the last burst packet count is equal to the total number of packets in the * TD. SuperSpeed endpoints can have up to 3 bursts. All but the last burst * must contain (bMaxBurst + 1) number of packets, but the last burst can * contain 1 to (bMaxBurst + 1) packets. */ static unsigned int xhci_get_last_burst_packet_count(struct xhci_hcd *xhci, struct urb *urb, unsigned int total_packet_count) { … } /* * Calculates Frame ID field of the isochronous TRB identifies the * target frame that the Interval associated with this Isochronous * Transfer Descriptor will start on. Refer to 4.11.2.5 in 1.1 spec. * * Returns actual frame id on success, negative value on error. */ static int xhci_get_isoc_frame_id(struct xhci_hcd *xhci, struct urb *urb, int index) { … } /* Check if we should generate event interrupt for a TD in an isoc URB */ static bool trb_block_event_intr(struct xhci_hcd *xhci, int num_tds, int i, struct xhci_interrupter *ir) { … } /* This is for isoc transfer */ static int xhci_queue_isoc_tx(struct xhci_hcd *xhci, gfp_t mem_flags, struct urb *urb, int slot_id, unsigned int ep_index) { … } /* * Check transfer ring to guarantee there is enough room for the urb. * Update ISO URB start_frame and interval. * Update interval as xhci_queue_intr_tx does. Use xhci frame_index to * update urb->start_frame if URB_ISO_ASAP is set in transfer_flags or * Contiguous Frame ID is not supported by HC. */ int xhci_queue_isoc_tx_prepare(struct xhci_hcd *xhci, gfp_t mem_flags, struct urb *urb, int slot_id, unsigned int ep_index) { … } /**** Command Ring Operations ****/ /* Generic function for queueing a command TRB on the command ring. * Check to make sure there's room on the command ring for one command TRB. * Also check that there's room reserved for commands that must not fail. * If this is a command that must not fail, meaning command_must_succeed = TRUE, * then only check for the number of reserved spots. * Don't decrement xhci->cmd_ring_reserved_trbs after we've queued the TRB * because the command event handler may want to resubmit a failed command. */ static int queue_command(struct xhci_hcd *xhci, struct xhci_command *cmd, u32 field1, u32 field2, u32 field3, u32 field4, bool command_must_succeed) { … } /* Queue a slot enable or disable request on the command ring */ int xhci_queue_slot_control(struct xhci_hcd *xhci, struct xhci_command *cmd, u32 trb_type, u32 slot_id) { … } /* Queue an address device command TRB */ int xhci_queue_address_device(struct xhci_hcd *xhci, struct xhci_command *cmd, dma_addr_t in_ctx_ptr, u32 slot_id, enum xhci_setup_dev setup) { … } int xhci_queue_vendor_command(struct xhci_hcd *xhci, struct xhci_command *cmd, u32 field1, u32 field2, u32 field3, u32 field4) { … } /* Queue a reset device command TRB */ int xhci_queue_reset_device(struct xhci_hcd *xhci, struct xhci_command *cmd, u32 slot_id) { … } /* Queue a configure endpoint command TRB */ int xhci_queue_configure_endpoint(struct xhci_hcd *xhci, struct xhci_command *cmd, dma_addr_t in_ctx_ptr, u32 slot_id, bool command_must_succeed) { … } /* Queue an evaluate context command TRB */ int xhci_queue_evaluate_context(struct xhci_hcd *xhci, struct xhci_command *cmd, dma_addr_t in_ctx_ptr, u32 slot_id, bool command_must_succeed) { … } /* * Suspend is set to indicate "Stop Endpoint Command" is being issued to stop * activity on an endpoint that is about to be suspended. */ int xhci_queue_stop_endpoint(struct xhci_hcd *xhci, struct xhci_command *cmd, int slot_id, unsigned int ep_index, int suspend) { … } int xhci_queue_reset_ep(struct xhci_hcd *xhci, struct xhci_command *cmd, int slot_id, unsigned int ep_index, enum xhci_ep_reset_type reset_type) { … }
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