From patchwork Tue Dec 13 14:10:05 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Albert Wang X-Patchwork-Id: 13072114 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3FF4EC10F1E for ; Tue, 13 Dec 2022 14:12:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235692AbiLMOML (ORCPT ); Tue, 13 Dec 2022 09:12:11 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36048 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235894AbiLMOLs (ORCPT ); Tue, 13 Dec 2022 09:11:48 -0500 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E8A702188D for ; Tue, 13 Dec 2022 06:10:43 -0800 (PST) Received: by mail-yb1-xb49.google.com with SMTP id h66-20020a252145000000b0071a7340eea9so13226319ybh.6 for ; Tue, 13 Dec 2022 06:10:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=IazsSpG7fcgPawhilo+Akx8DgvbU0pRdUVn94g1nQSg=; b=ZFDLWcExas1fbQAmMKyGhT3OkbQxOQaEdfriBTS6JdZQI00n/GQbuN66Lco5XImtjT kZIESnkH67i2T9PFNraNCKHUpMCXy8YU8SM3W2w44yU1e74PD6FMPXW4Datn8jzdqZh6 qc5wAFe6Od8GC7LU52GGwuQJpQpjACC8RKyeacKMWHSWg2cHJ9PG7o5TPpx5Csee1j+e LFHjIEfQXKc4iy7RRb8uvGdFFlNWyfnb+nMkD+/Gji6Czb34n7DpG2iSdCmXBLjVoYdR chlU38qpEI2YaSfu5jMANepvAtfASD3QZy+zDCQCCdN73mSHs5VwgFP36rY9ixjoC4iA XpCA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=IazsSpG7fcgPawhilo+Akx8DgvbU0pRdUVn94g1nQSg=; b=oH6g+8k3NzHC5Fgv++iHbt61v1y1yn0Jzh/A4rC1LKr3Pdlp5XalXHZsAPtgTEw6X/ EagQEF/42gjgp6OkT0MV7XTMXB0a3WpBfc5XBoblXlw1AzzzM7ipReFpMN+zchWfsIvg UncCwaut+Cr7irph17wJrU1tsoeYG7HAxhWTAZjgPKedhG7p+8Ny/e8PjW0csUgNyP9g qE8HFbEC8YRApQWgJMwwYAXCfjkdOjhB2wYWSRdLClbZ/JWNWu/3wbm4/M9+1eYxM1FW xEQkrf9IXBPn2fECttYAQTNP3OrU1uz+wrdDxB3doEtLe+qqey1nIMBxspqJ0We7stxZ 50qA== X-Gm-Message-State: ANoB5pmRcXuN/F5jr+lZPG8ZJbR8p4ZBaFu4oW+BrJX263dijgZ33C8L YPj4NCfcWbMXF7SQzsnBGxz+kkmjX1P3PGsKfcQ= X-Google-Smtp-Source: AA0mqf6bZq5lk2o5ROtjASap72pHyN/9rHcvIX+dtcfadEo7eZVnw77Tk3X65zw7lM6/NbOHmEqZUmyw/5I8+TA28cQ= X-Received: from albertccwang.c.googlers.com ([fda3:e722:ac3:cc00:3:22c1:c0a8:83d]) (user=albertccwang job=sendgmr) by 2002:a25:2d44:0:b0:6f0:6dfa:c762 with SMTP id s4-20020a252d44000000b006f06dfac762mr64433088ybe.109.1670940643201; Tue, 13 Dec 2022 06:10:43 -0800 (PST) Date: Tue, 13 Dec 2022 14:10:05 +0000 In-Reply-To: <20221213141005.3068792-1-albertccwang@google.com> Mime-Version: 1.0 References: <20221213141005.3068792-1-albertccwang@google.com> X-Mailer: git-send-email 2.39.0.rc1.256.g54fd8350bd-goog Message-ID: <20221213141005.3068792-4-albertccwang@google.com> Subject: [PATCH v3 3/3] usb: host: add the xhci offload hooks implementations From: Albert Wang To: mathias.nyman@intel.com, gregkh@linuxfoundation.org Cc: badhri@google.com, howardyen@google.com, pumahsu@google.com, raychi@google.com, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, Albert Wang Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Add the offload hooks implementations which are used in the xHCI driver for vendor offload function, and some functions will call to co-processor driver for further offload operations. Signed-off-by: Albert Wang Signed-off-by: Howard Yen --- Changes in v3: - Add new implementation driver file in v3 --- drivers/usb/host/aoc-usb.c | 198 ++++++++++++++ drivers/usb/host/aoc-usb.h | 108 ++++++++ drivers/usb/host/xhci-offload-impl.c | 396 +++++++++++++++++++++++++++ 3 files changed, 702 insertions(+) create mode 100644 drivers/usb/host/aoc-usb.c create mode 100644 drivers/usb/host/aoc-usb.h create mode 100644 drivers/usb/host/xhci-offload-impl.c diff --git a/drivers/usb/host/aoc-usb.c b/drivers/usb/host/aoc-usb.c new file mode 100644 index 000000000000..b51f26755a63 --- /dev/null +++ b/drivers/usb/host/aoc-usb.c @@ -0,0 +1,198 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright 2022 Google LLC. All Rights Reserved. + * + * Interface to the AoC USB control service + */ + +#include +#include +#include +#include +#include + +#include "aoc-usb.h" + +#define AOC_USB_NAME "aoc_usb" + +extern struct blocking_notifier_head aoc_usb_notifier_list; + +int xhci_set_offload_state(bool enabled) +{ + return blocking_notifier_call_chain(&aoc_usb_notifier_list, SET_OFFLOAD_STATE, &enabled); +} + +int xhci_set_dcbaa_ptr(u64 aoc_dcbaa_ptr) +{ + return blocking_notifier_call_chain(&aoc_usb_notifier_list, SET_DCBAA_PTR, &aoc_dcbaa_ptr); +} + +int xhci_setup_done(void) +{ + return blocking_notifier_call_chain(&aoc_usb_notifier_list, SETUP_DONE, NULL); +} + +int xhci_sync_conn_stat(unsigned int bus_id, unsigned int dev_num, unsigned int slot_id, + unsigned int conn_stat) +{ + struct conn_stat_args args; + + args.bus_id = bus_id; + args.dev_num = dev_num; + args.slot_id = slot_id; + args.conn_stat = conn_stat; + + return blocking_notifier_call_chain(&aoc_usb_notifier_list, SYNC_CONN_STAT, &args); +} + +int usb_host_mode_state_notify(enum usb_conn_state usb_state) +{ + return xhci_sync_conn_stat(0, 0, 0, usb_state); +} + +int xhci_set_isoc_tr_info(u16 ep_id, u16 dir, struct xhci_ring *ep_ring) +{ + struct get_isoc_tr_info_args tr_info; + + tr_info.ep_id = ep_id; + tr_info.dir = dir; + tr_info.num_segs = ep_ring->num_segs; + tr_info.max_packet = ep_ring->bounce_buf_len; + tr_info.type = ep_ring->type; + tr_info.seg_ptr = ep_ring->first_seg->dma; + tr_info.cycle_state = ep_ring->cycle_state; + tr_info.num_trbs_free = ep_ring->num_trbs_free; + + return blocking_notifier_call_chain(&aoc_usb_notifier_list, SET_ISOC_TR_INFO, &tr_info); +} + +static int aoc_usb_match(struct device *dev, void *data) +{ + if (sysfs_streq(dev_driver_string(dev), "xhci-hcd-exynos")) + return 1; + + return 0; +} + +static bool aoc_usb_is_hcd_working(void) +{ + struct device_node *np; + struct platform_device *pdev; + struct device *udev; + int ret; + + np = of_find_node_by_name(NULL, "dwc3"); + if (!np || !of_device_is_available(np)) { + pr_err("Cannot find dwc3 device node\n"); + return false; + } + + pdev = of_find_device_by_node(np); + if (!pdev) + return false; + + udev = device_find_child(&pdev->dev, NULL, aoc_usb_match); + if (!udev) + return false; + + ret = usb_host_mode_state_notify(USB_CONNECTED); + if (ret) + dev_err(udev, "Notifying AoC for xhci driver status is failed.\n"); + + return true; +} + +static struct work_struct usb_host_mode_checking_ws; +static void usb_host_mode_checking_work(struct work_struct *ws) +{ + if (aoc_usb_is_hcd_working()) + pr_info("USB HCD is working, send notification to AoC\n"); +} + +/* + * This variable used to present if aoc_usb module was probed done. If offload + * is enabled, the controller needs to wait for the aoc_usb probe done and then + * continue the controller's probe. + */ +static bool aoc_usb_probe_done; +static int aoc_usb_probe(struct aoc_service_dev *adev) +{ + struct device *dev = &adev->dev; + struct aoc_usb_drvdata *drvdata; + + drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL); + if (!drvdata) + return -ENOMEM; + + drvdata->adev = adev; + + mutex_init(&drvdata->lock); + + drvdata->ws = wakeup_source_register(dev, dev_name(dev)); + if (!drvdata->ws) { + dev_err(&drvdata->adev->dev, "wakeup_source_register failed!\n"); + return -ENOMEM; + } + + drvdata->usb_conn_state = 0; + dev_set_drvdata(dev, drvdata); + + aoc_usb_probe_done = true; + + schedule_work(&usb_host_mode_checking_ws); + + return 0; +} + +static int aoc_usb_remove(struct aoc_service_dev *adev) +{ + struct aoc_usb_drvdata *drvdata = dev_get_drvdata(&adev->dev); + + wakeup_source_unregister(drvdata->ws); + mutex_destroy(&drvdata->lock); + + kfree(drvdata); + + aoc_usb_probe_done = false; + + return 0; +} + +bool is_aoc_usb_probe_done(void) +{ + return aoc_usb_probe_done; +} + +static const char *const aoc_usb_service_names[] = { + "usb_control", + NULL, +}; + +static struct aoc_driver aoc_usb_driver = { + .drv = { + .name = AOC_USB_NAME, + }, + .service_names = aoc_usb_service_names, + .probe = aoc_usb_probe, + .remove = aoc_usb_remove, +}; + +static int __init aoc_usb_init(void) +{ + xhci_offload_helper_init(); + + INIT_WORK(&usb_host_mode_checking_ws, usb_host_mode_checking_work); + + return driver_register(&aoc_usb_driver.drv); +} + +static void __exit aoc_usb_exit(void) +{ + driver_unregister(&aoc_usb_driver.drv); +} + +module_init(aoc_usb_init); +module_exit(aoc_usb_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Howard Yen (Google)"); +MODULE_DESCRIPTION("USB driver for AoC"); diff --git a/drivers/usb/host/aoc-usb.h b/drivers/usb/host/aoc-usb.h new file mode 100644 index 000000000000..a756abd00d01 --- /dev/null +++ b/drivers/usb/host/aoc-usb.h @@ -0,0 +1,108 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2022 Google Corp. + * + * Author: + * Howard.Yen + */ + +#ifndef __LINUX_AOC_USB_H +#define __LINUX_AOC_USB_H + +#include "xhci.h" + +struct aoc_service_dev { + struct device dev; + wait_queue_head_t read_queue; + wait_queue_head_t write_queue; + + void *ipc_base; + void *prvdata; + uint64_t suspend_rx_count; + + uint8_t mbox_index; + uint8_t service_index; + + bool dead; + bool wake_capable; +}; + +struct aoc_driver { + struct device_driver drv; + + /* Array of service names to match against. Last entry must be NULL */ + const char * const *service_names; + int (*probe)(struct aoc_service_dev *dev); + int (*remove)(struct aoc_service_dev *dev); +}; + +enum usb_offload_msg { + SET_DCBAA_PTR, + GET_TR_DEQUEUE_PTR, + SETUP_DONE, + SET_ISOC_TR_INFO, + SYNC_CONN_STAT, + SET_OFFLOAD_STATE +}; + +enum usb_offload_op_mode { + USB_OFFLOAD_STOP, + USB_OFFLOAD_DRAM +}; + +enum usb_conn_state { + USB_DISCONNECTED, + USB_CONNECTED +}; + +enum usb_recover_state { + NONE, + RECOVER_HOST_OFF, + RECOVER_HOST_ON, + RECOVERED +}; + +struct aoc_usb_drvdata { + struct aoc_service_dev *adev; + + struct mutex lock; + struct wakeup_source *ws; + + struct notifier_block nb; + + unsigned int usb_conn_state; +}; + +struct conn_stat_args { + u16 bus_id; + u16 dev_num; + u16 slot_id; + u32 conn_stat; +}; + +struct get_isoc_tr_info_args { + u16 ep_id; + u16 dir; + u32 type; + u32 num_segs; + u32 seg_ptr; + u32 max_packet; + u32 deq_ptr; + u32 enq_ptr; + u32 cycle_state; + u32 num_trbs_free; +}; + +int xhci_set_offload_state(bool enabled); +int xhci_set_dcbaa_ptr(u64 aoc_dcbaa_ptr); +int xhci_setup_done(void); +int xhci_sync_conn_stat(unsigned int bus_id, unsigned int dev_num, unsigned int slot_id, + unsigned int conn_stat); +int usb_host_mode_state_notify(enum usb_conn_state usb_state); +int xhci_set_isoc_tr_info(u16 ep_id, u16 dir, struct xhci_ring *ep_ring); + +bool is_aoc_usb_probe_done(void); + +int xhci_offload_helper_init(void); + +#endif /* __LINUX_AOC_USB_H */ diff --git a/drivers/usb/host/xhci-offload-impl.c b/drivers/usb/host/xhci-offload-impl.c new file mode 100644 index 000000000000..738595382f7e --- /dev/null +++ b/drivers/usb/host/xhci-offload-impl.c @@ -0,0 +1,396 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2022 Google Corp. + * + * Author: + * Howard.Yen + */ + +#include +#include +#include +#include +#include + +#include "aoc-usb.h" +#include "xhci-plat.h" + +struct xhci_offload_data { + struct xhci_hcd *xhci; + + bool usb_accessory_enabled; + bool usb_audio_offload; + bool dt_direct_usb_access; + bool offload_state; + + enum usb_offload_op_mode op_mode; +}; + +static struct xhci_offload_data *offload_data; +struct xhci_offload_data *xhci_get_offload_data(void) +{ + return offload_data; +} + +/* + * Determine if an USB device is a compatible devices: + * True: Devices are audio class and they contain ISOC endpoint + * False: Devices are not audio class or they're audio class but no ISOC endpoint or + * they have at least one interface is video class + */ +static bool is_compatible_with_usb_audio_offload(struct usb_device *udev) +{ + struct usb_endpoint_descriptor *epd; + struct usb_host_config *config; + struct usb_host_interface *alt; + struct usb_interface_cache *intfc; + int i, j, k; + bool is_audio = false; + + config = udev->config; + for (i = 0; i < config->desc.bNumInterfaces; i++) { + intfc = config->intf_cache[i]; + for (j = 0; j < intfc->num_altsetting; j++) { + alt = &intfc->altsetting[j]; + + if (alt->desc.bInterfaceClass == USB_CLASS_VIDEO) { + is_audio = false; + goto out; + } + + if (alt->desc.bInterfaceClass == USB_CLASS_AUDIO) { + for (k = 0; k < alt->desc.bNumEndpoints; k++) { + epd = &alt->endpoint[k].desc; + if (usb_endpoint_xfer_isoc(epd)) { + is_audio = true; + break; + } + } + } + } + } + +out: + return is_audio; +} + +/* + * check the usb device including the video class: + * True: Devices contain video class + * False: Device doesn't contain video class + */ +static bool is_usb_video_device(struct usb_device *udev) +{ + struct usb_host_config *config; + struct usb_host_interface *alt; + struct usb_interface_cache *intfc; + int i, j; + bool is_video = false; + + if (!udev || !udev->config) + return is_video; + + config = udev->config; + + for (i = 0; i < config->desc.bNumInterfaces; i++) { + intfc = config->intf_cache[i]; + for (j = 0; j < intfc->num_altsetting; j++) { + alt = &intfc->altsetting[j]; + + if (alt->desc.bInterfaceClass == USB_CLASS_VIDEO) { + is_video = true; + goto out; + } + } + } + +out: + return is_video; +} + +static int xhci_udev_notify(struct notifier_block *self, unsigned long action, + void *dev) +{ + struct usb_device *udev = dev; + struct xhci_offload_data *offload_data = xhci_get_offload_data(); + + switch (action) { + case USB_DEVICE_ADD: + if (is_compatible_with_usb_audio_offload(udev)) { + dev_dbg(&udev->dev, "Compatible with usb audio offload\n"); + if (offload_data->op_mode == USB_OFFLOAD_DRAM) { + xhci_sync_conn_stat(udev->bus->busnum, udev->devnum, udev->slot_id, + USB_CONNECTED); + } + } + offload_data->usb_accessory_enabled = false; + break; + case USB_DEVICE_REMOVE: + if (is_compatible_with_usb_audio_offload(udev) && + (offload_data->op_mode == USB_OFFLOAD_DRAM)) { + xhci_sync_conn_stat(udev->bus->busnum, udev->devnum, udev->slot_id, + USB_DISCONNECTED); + } + offload_data->usb_accessory_enabled = false; + break; + } + + return NOTIFY_OK; +} + +static struct notifier_block xhci_udev_nb = { + .notifier_call = xhci_udev_notify, +}; + +static int usb_audio_offload_init(struct xhci_hcd *xhci) +{ + struct device *dev = xhci_to_hcd(xhci)->self.sysdev; + struct xhci_offload_data *offload_data = xhci_get_offload_data(); + int ret; + u32 out_val; + + if (!is_aoc_usb_probe_done()) { + dev_info(dev, "%s: deferring the probe\n", __func__); + return -EPROBE_DEFER; + } + + offload_data = kzalloc(sizeof(struct xhci_offload_data), GFP_KERNEL); + if (!offload_data) + return -ENOMEM; + + if (!of_property_read_u32(dev->of_node, "offload", &out_val)) + offload_data->usb_audio_offload = (out_val == 1) ? true : false; + + ret = of_reserved_mem_device_init(dev); + if (ret) { + dev_err(dev, "Could not get reserved memory\n"); + kfree(offload_data); + return ret; + } + + offload_data->dt_direct_usb_access = + of_property_read_bool(dev->of_node, "direct-usb-access") ? true : false; + if (!offload_data->dt_direct_usb_access) + dev_warn(dev, "Direct USB access is not supported\n"); + + offload_data->offload_state = true; + + usb_register_notify(&xhci_udev_nb); + offload_data->op_mode = USB_OFFLOAD_DRAM; + offload_data->xhci = xhci; + + return 0; +} + +static void usb_audio_offload_cleanup(struct xhci_hcd *xhci) +{ + struct xhci_offload_data *offload_data = xhci_get_offload_data(); + + offload_data->usb_audio_offload = false; + offload_data->op_mode = USB_OFFLOAD_STOP; + offload_data->xhci = NULL; + + usb_unregister_notify(&xhci_udev_nb); + + /* Notification for xhci driver removing */ + usb_host_mode_state_notify(USB_DISCONNECTED); + + kfree(offload_data); +} + +static bool is_offload_enabled(struct xhci_hcd *xhci, + struct xhci_virt_device *vdev, unsigned int ep_index) +{ + struct usb_device *udev; + struct xhci_offload_data *offload_data = xhci_get_offload_data(); + bool global_enabled = offload_data->op_mode != USB_OFFLOAD_STOP; + struct xhci_ring *ep_ring; + + if (vdev == NULL || vdev->eps[ep_index].ring == NULL) + return global_enabled; + + udev = vdev->udev; + + if (global_enabled) { + ep_ring = vdev->eps[ep_index].ring; + if (offload_data->op_mode == USB_OFFLOAD_DRAM) { + if (is_usb_video_device(udev)) + return false; + else if (ep_ring->type == TYPE_ISOC) + return offload_data->offload_state; + } + } + + return false; +} + +static bool is_usb_bulk_transfer_enabled(struct xhci_hcd *xhci, struct urb *urb) +{ + struct xhci_offload_data *offload_data = xhci_get_offload_data(); + struct usb_endpoint_descriptor *desc = &urb->ep->desc; + int ep_type = usb_endpoint_type(desc); + struct usb_ctrlrequest *cmd; + bool skip_bulk = false; + + cmd = (struct usb_ctrlrequest *) urb->setup_packet; + + if (ep_type == USB_ENDPOINT_XFER_CONTROL) { + if (!usb_endpoint_dir_in(desc) && cmd->bRequest == 0x35) + offload_data->usb_accessory_enabled = true; + else + offload_data->usb_accessory_enabled = false; + } + + if (ep_type == USB_ENDPOINT_XFER_BULK && !usb_endpoint_dir_in(desc)) + skip_bulk = offload_data->usb_accessory_enabled; + + return skip_bulk; +} + +static void alloc_dcbaa(struct xhci_hcd *xhci, gfp_t flags) +{ + dma_addr_t dma; + struct device *dev = xhci_to_hcd(xhci)->self.sysdev; + struct xhci_offload_data *offload_data = xhci_get_offload_data(); + + if (offload_data->op_mode == USB_OFFLOAD_DRAM) { + xhci->dcbaa = dma_alloc_coherent(dev, sizeof(*xhci->dcbaa), + &dma, flags); + if (!xhci->dcbaa) + return; + + xhci->dcbaa->dma = dma; + if (xhci_set_dcbaa_ptr(xhci->dcbaa->dma) != 0) { + xhci_err(xhci, "Set DCBAA pointer failed\n"); + xhci->dcbaa = NULL; + return; + } + xhci_setup_done(); + + xhci_dbg(xhci, "Set dcbaa_ptr=%llx to AoC\n", xhci->dcbaa->dma); + } else { + xhci->dcbaa = dma_alloc_coherent(dev, sizeof(*xhci->dcbaa), + &dma, flags); + if (!xhci->dcbaa) + return; + + xhci->dcbaa->dma = dma; + } +} + +static void free_dcbaa(struct xhci_hcd *xhci) +{ + struct device *dev = xhci_to_hcd(xhci)->self.sysdev; + + if (!xhci->dcbaa) + return; + + dma_free_coherent(dev, sizeof(*xhci->dcbaa), + xhci->dcbaa, xhci->dcbaa->dma); + + xhci->dcbaa = NULL; +} + +static struct xhci_ring *alloc_transfer_ring(struct xhci_hcd *xhci, + u32 endpoint_type, enum xhci_ring_type ring_type, + unsigned int max_packet, gfp_t mem_flags) +{ + struct xhci_ring *ep_ring; + u16 dir; + + ep_ring = xhci_ring_alloc(xhci, 1, 1, ring_type, max_packet, mem_flags); + dir = endpoint_type == ISOC_IN_EP ? 0 : 1; + + xhci_set_isoc_tr_info(0, dir, ep_ring); + + return ep_ring; +} + +static void free_transfer_ring(struct xhci_hcd *xhci, struct xhci_virt_device *virt_dev, + unsigned int ep_index) +{ + struct xhci_ring *ring, *new_ring; + struct xhci_ep_ctx *ep_ctx; + struct xhci_input_control_ctx *ctrl_ctx; + u32 ep_type; + u32 ep_is_added, ep_is_dropped; + + ring = virt_dev->eps[ep_index].ring; + new_ring = virt_dev->eps[ep_index].new_ring; + ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->out_ctx, ep_index); + ep_type = CTX_TO_EP_TYPE(le32_to_cpu(ep_ctx->ep_info2)); + + ctrl_ctx = xhci_get_input_control_ctx(virt_dev->in_ctx); + if (!ctrl_ctx) { + xhci_warn(xhci, "%s: Could not get input context, bad type.\n", __func__); + return; + } + ep_is_added = EP_IS_ADDED(ctrl_ctx, ep_index); + ep_is_dropped = EP_IS_DROPPED(ctrl_ctx, ep_index); + + xhci_dbg(xhci, "%s: ep %u is added(0x%x), is dropped(0x%x)\n", __func__, ep_index, + ep_is_added, ep_is_dropped); + + if (ring) { + xhci_dbg(xhci, "%s: ep_index=%u, ep_type=%u, ring type=%u, new_ring=%pK\n", + __func__, ep_index, ep_type, ring->type, new_ring); + + xhci_ring_free(xhci, virt_dev->eps[ep_index].ring); + + virt_dev->eps[ep_index].ring = NULL; + + if (ep_is_added == 0 && ep_is_dropped == 0) + return; + } + + if (new_ring) { + xhci_dbg(xhci, "%s: ep_index=%u, ep_type=%u, new_ring type=%u\n", __func__, + ep_index, ep_type, new_ring->type); + + xhci_ring_free(xhci, virt_dev->eps[ep_index].new_ring); + + virt_dev->eps[ep_index].new_ring = NULL; + + return; + } +} + +static bool offload_skip_urb(struct xhci_hcd *xhci, struct urb *urb) +{ + struct xhci_virt_device *vdev = xhci->devs[urb->dev->slot_id]; + struct usb_endpoint_descriptor *desc = &urb->ep->desc; + int ep_type = usb_endpoint_type(desc); + unsigned int ep_index; + + if (ep_type == USB_ENDPOINT_XFER_CONTROL) + ep_index = (unsigned int)(usb_endpoint_num(desc)*2); + else + ep_index = (unsigned int)(usb_endpoint_num(desc)*2) + + (usb_endpoint_dir_in(desc) ? 1 : 0) - 1; + + xhci_dbg(xhci, "%s: ep_index=%u, ep_type=%d\n", __func__, ep_index, ep_type); + + if (is_offload_enabled(xhci, vdev, ep_index)) + return true; + + if (is_usb_bulk_transfer_enabled(xhci, urb)) + return true; + + return false; +} + +static struct xhci_offload_ops offload_ops = { + .offload_init = usb_audio_offload_init, + .offload_cleanup = usb_audio_offload_cleanup, + .is_offload_enabled = is_offload_enabled, + .alloc_dcbaa = alloc_dcbaa, + .free_dcbaa = free_dcbaa, + .alloc_transfer_ring = alloc_transfer_ring, + .free_transfer_ring = free_transfer_ring, + .usb_offload_skip_urb = offload_skip_urb, +}; + +int xhci_offload_helper_init(void) +{ + return xhci_plat_register_offload_ops(&offload_ops); +}