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![Mika Westerberg](/assets/img/avatar_default.png)
This gets rid of the licence boilerplate duplicated in each file. While there fix doubled space in domain.c author line. No functional changes intended. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Acked-by: Yehezkel Bernat <yehezkelshb@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1608 lines
40 KiB
C
1608 lines
40 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Thunderbolt XDomain discovery protocol support
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*
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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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#include <linux/device.h>
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#include <linux/kmod.h>
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#include <linux/module.h>
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#include <linux/pm_runtime.h>
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#include <linux/utsname.h>
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#include <linux/uuid.h>
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#include <linux/workqueue.h>
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#include "tb.h"
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#define XDOMAIN_DEFAULT_TIMEOUT 5000 /* ms */
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#define XDOMAIN_PROPERTIES_RETRIES 60
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#define XDOMAIN_PROPERTIES_CHANGED_RETRIES 10
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struct xdomain_request_work {
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struct work_struct work;
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struct tb_xdp_header *pkg;
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struct tb *tb;
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};
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/* Serializes access to the properties and protocol handlers below */
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static DEFINE_MUTEX(xdomain_lock);
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/* Properties exposed to the remote domains */
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static struct tb_property_dir *xdomain_property_dir;
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static u32 *xdomain_property_block;
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static u32 xdomain_property_block_len;
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static u32 xdomain_property_block_gen;
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/* Additional protocol handlers */
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static LIST_HEAD(protocol_handlers);
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/* UUID for XDomain discovery protocol: b638d70e-42ff-40bb-97c2-90e2c0b2ff07 */
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static const uuid_t tb_xdp_uuid =
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UUID_INIT(0xb638d70e, 0x42ff, 0x40bb,
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0x97, 0xc2, 0x90, 0xe2, 0xc0, 0xb2, 0xff, 0x07);
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static bool tb_xdomain_match(const struct tb_cfg_request *req,
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const struct ctl_pkg *pkg)
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{
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switch (pkg->frame.eof) {
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case TB_CFG_PKG_ERROR:
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return true;
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case TB_CFG_PKG_XDOMAIN_RESP: {
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const struct tb_xdp_header *res_hdr = pkg->buffer;
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const struct tb_xdp_header *req_hdr = req->request;
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if (pkg->frame.size < req->response_size / 4)
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return false;
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/* Make sure route matches */
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if ((res_hdr->xd_hdr.route_hi & ~BIT(31)) !=
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req_hdr->xd_hdr.route_hi)
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return false;
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if ((res_hdr->xd_hdr.route_lo) != req_hdr->xd_hdr.route_lo)
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return false;
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/* Check that the XDomain protocol matches */
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if (!uuid_equal(&res_hdr->uuid, &req_hdr->uuid))
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return false;
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return true;
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}
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default:
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return false;
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}
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}
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static bool tb_xdomain_copy(struct tb_cfg_request *req,
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const struct ctl_pkg *pkg)
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{
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memcpy(req->response, pkg->buffer, req->response_size);
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req->result.err = 0;
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return true;
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}
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static void response_ready(void *data)
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{
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tb_cfg_request_put(data);
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}
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static int __tb_xdomain_response(struct tb_ctl *ctl, const void *response,
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size_t size, enum tb_cfg_pkg_type type)
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{
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struct tb_cfg_request *req;
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req = tb_cfg_request_alloc();
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if (!req)
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return -ENOMEM;
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req->match = tb_xdomain_match;
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req->copy = tb_xdomain_copy;
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req->request = response;
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req->request_size = size;
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req->request_type = type;
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return tb_cfg_request(ctl, req, response_ready, req);
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}
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/**
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* tb_xdomain_response() - Send a XDomain response message
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* @xd: XDomain to send the message
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* @response: Response to send
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* @size: Size of the response
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* @type: PDF type of the response
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*
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* This can be used to send a XDomain response message to the other
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* domain. No response for the message is expected.
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*
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* Return: %0 in case of success and negative errno in case of failure
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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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{
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return __tb_xdomain_response(xd->tb->ctl, response, size, type);
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}
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EXPORT_SYMBOL_GPL(tb_xdomain_response);
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static int __tb_xdomain_request(struct tb_ctl *ctl, const void *request,
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size_t request_size, enum tb_cfg_pkg_type request_type, void *response,
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size_t response_size, enum tb_cfg_pkg_type response_type,
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unsigned int timeout_msec)
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{
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struct tb_cfg_request *req;
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struct tb_cfg_result res;
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req = tb_cfg_request_alloc();
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if (!req)
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return -ENOMEM;
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req->match = tb_xdomain_match;
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req->copy = tb_xdomain_copy;
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req->request = request;
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req->request_size = request_size;
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req->request_type = request_type;
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req->response = response;
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req->response_size = response_size;
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req->response_type = response_type;
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res = tb_cfg_request_sync(ctl, req, timeout_msec);
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tb_cfg_request_put(req);
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return res.err == 1 ? -EIO : res.err;
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}
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/**
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* tb_xdomain_request() - Send a XDomain request
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* @xd: XDomain to send the request
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* @request: Request to send
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* @request_size: Size of the request in bytes
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* @request_type: PDF type of the request
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* @response: Response is copied here
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* @response_size: Expected size of the response in bytes
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* @response_type: Expected PDF type of the response
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* @timeout_msec: Timeout in milliseconds to wait for the response
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*
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* This function can be used to send XDomain control channel messages to
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* the other domain. The function waits until the response is received
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* or when timeout triggers. Whichever comes first.
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*
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* Return: %0 in case of success and negative errno in case of failure
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*/
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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, unsigned int timeout_msec)
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{
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return __tb_xdomain_request(xd->tb->ctl, request, request_size,
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request_type, response, response_size,
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response_type, timeout_msec);
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}
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EXPORT_SYMBOL_GPL(tb_xdomain_request);
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static inline void tb_xdp_fill_header(struct tb_xdp_header *hdr, u64 route,
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u8 sequence, enum tb_xdp_type type, size_t size)
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{
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u32 length_sn;
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length_sn = (size - sizeof(hdr->xd_hdr)) / 4;
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length_sn |= (sequence << TB_XDOMAIN_SN_SHIFT) & TB_XDOMAIN_SN_MASK;
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hdr->xd_hdr.route_hi = upper_32_bits(route);
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hdr->xd_hdr.route_lo = lower_32_bits(route);
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hdr->xd_hdr.length_sn = length_sn;
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hdr->type = type;
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memcpy(&hdr->uuid, &tb_xdp_uuid, sizeof(tb_xdp_uuid));
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}
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static int tb_xdp_handle_error(const struct tb_xdp_header *hdr)
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{
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const struct tb_xdp_error_response *error;
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if (hdr->type != ERROR_RESPONSE)
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return 0;
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error = (const struct tb_xdp_error_response *)hdr;
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switch (error->error) {
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case ERROR_UNKNOWN_PACKET:
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case ERROR_UNKNOWN_DOMAIN:
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return -EIO;
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case ERROR_NOT_SUPPORTED:
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return -ENOTSUPP;
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case ERROR_NOT_READY:
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return -EAGAIN;
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default:
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break;
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}
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return 0;
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}
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static int tb_xdp_error_response(struct tb_ctl *ctl, u64 route, u8 sequence,
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enum tb_xdp_error error)
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{
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struct tb_xdp_error_response res;
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memset(&res, 0, sizeof(res));
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tb_xdp_fill_header(&res.hdr, route, sequence, ERROR_RESPONSE,
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sizeof(res));
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res.error = error;
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return __tb_xdomain_response(ctl, &res, sizeof(res),
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TB_CFG_PKG_XDOMAIN_RESP);
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}
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static int tb_xdp_properties_request(struct tb_ctl *ctl, u64 route,
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const uuid_t *src_uuid, const uuid_t *dst_uuid, int retry,
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u32 **block, u32 *generation)
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{
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struct tb_xdp_properties_response *res;
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struct tb_xdp_properties req;
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u16 data_len, len;
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size_t total_size;
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u32 *data = NULL;
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int ret;
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total_size = sizeof(*res) + TB_XDP_PROPERTIES_MAX_DATA_LENGTH * 4;
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res = kzalloc(total_size, GFP_KERNEL);
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if (!res)
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return -ENOMEM;
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memset(&req, 0, sizeof(req));
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tb_xdp_fill_header(&req.hdr, route, retry % 4, PROPERTIES_REQUEST,
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sizeof(req));
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memcpy(&req.src_uuid, src_uuid, sizeof(*src_uuid));
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memcpy(&req.dst_uuid, dst_uuid, sizeof(*dst_uuid));
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len = 0;
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data_len = 0;
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do {
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ret = __tb_xdomain_request(ctl, &req, sizeof(req),
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TB_CFG_PKG_XDOMAIN_REQ, res,
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total_size, TB_CFG_PKG_XDOMAIN_RESP,
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XDOMAIN_DEFAULT_TIMEOUT);
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if (ret)
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goto err;
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ret = tb_xdp_handle_error(&res->hdr);
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if (ret)
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goto err;
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/*
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* Package length includes the whole payload without the
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* XDomain header. Validate first that the package is at
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* least size of the response structure.
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*/
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len = res->hdr.xd_hdr.length_sn & TB_XDOMAIN_LENGTH_MASK;
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if (len < sizeof(*res) / 4) {
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ret = -EINVAL;
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goto err;
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}
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len += sizeof(res->hdr.xd_hdr) / 4;
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len -= sizeof(*res) / 4;
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if (res->offset != req.offset) {
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ret = -EINVAL;
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goto err;
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}
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/*
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* First time allocate block that has enough space for
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* the whole properties block.
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*/
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if (!data) {
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data_len = res->data_length;
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if (data_len > TB_XDP_PROPERTIES_MAX_LENGTH) {
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ret = -E2BIG;
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goto err;
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}
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data = kcalloc(data_len, sizeof(u32), GFP_KERNEL);
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if (!data) {
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ret = -ENOMEM;
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goto err;
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}
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}
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memcpy(data + req.offset, res->data, len * 4);
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req.offset += len;
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} while (!data_len || req.offset < data_len);
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*block = data;
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*generation = res->generation;
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kfree(res);
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return data_len;
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err:
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kfree(data);
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kfree(res);
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return ret;
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}
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static int tb_xdp_properties_response(struct tb *tb, struct tb_ctl *ctl,
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u64 route, u8 sequence, const uuid_t *src_uuid,
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const struct tb_xdp_properties *req)
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{
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struct tb_xdp_properties_response *res;
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size_t total_size;
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u16 len;
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int ret;
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/*
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* Currently we expect all requests to be directed to us. The
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* protocol supports forwarding, though which we might add
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* support later on.
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*/
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if (!uuid_equal(src_uuid, &req->dst_uuid)) {
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tb_xdp_error_response(ctl, route, sequence,
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ERROR_UNKNOWN_DOMAIN);
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return 0;
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}
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mutex_lock(&xdomain_lock);
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if (req->offset >= xdomain_property_block_len) {
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mutex_unlock(&xdomain_lock);
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return -EINVAL;
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}
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len = xdomain_property_block_len - req->offset;
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len = min_t(u16, len, TB_XDP_PROPERTIES_MAX_DATA_LENGTH);
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total_size = sizeof(*res) + len * 4;
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res = kzalloc(total_size, GFP_KERNEL);
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if (!res) {
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mutex_unlock(&xdomain_lock);
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return -ENOMEM;
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}
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tb_xdp_fill_header(&res->hdr, route, sequence, PROPERTIES_RESPONSE,
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total_size);
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res->generation = xdomain_property_block_gen;
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res->data_length = xdomain_property_block_len;
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res->offset = req->offset;
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uuid_copy(&res->src_uuid, src_uuid);
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uuid_copy(&res->dst_uuid, &req->src_uuid);
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memcpy(res->data, &xdomain_property_block[req->offset], len * 4);
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mutex_unlock(&xdomain_lock);
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ret = __tb_xdomain_response(ctl, res, total_size,
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TB_CFG_PKG_XDOMAIN_RESP);
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kfree(res);
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return ret;
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}
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static int tb_xdp_properties_changed_request(struct tb_ctl *ctl, u64 route,
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int retry, const uuid_t *uuid)
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{
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struct tb_xdp_properties_changed_response res;
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struct tb_xdp_properties_changed req;
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int ret;
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memset(&req, 0, sizeof(req));
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tb_xdp_fill_header(&req.hdr, route, retry % 4,
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PROPERTIES_CHANGED_REQUEST, sizeof(req));
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uuid_copy(&req.src_uuid, uuid);
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memset(&res, 0, sizeof(res));
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ret = __tb_xdomain_request(ctl, &req, sizeof(req),
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TB_CFG_PKG_XDOMAIN_REQ, &res, sizeof(res),
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TB_CFG_PKG_XDOMAIN_RESP,
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XDOMAIN_DEFAULT_TIMEOUT);
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if (ret)
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return ret;
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return tb_xdp_handle_error(&res.hdr);
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}
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static int
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tb_xdp_properties_changed_response(struct tb_ctl *ctl, u64 route, u8 sequence)
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{
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struct tb_xdp_properties_changed_response res;
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memset(&res, 0, sizeof(res));
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tb_xdp_fill_header(&res.hdr, route, sequence,
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PROPERTIES_CHANGED_RESPONSE, sizeof(res));
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return __tb_xdomain_response(ctl, &res, sizeof(res),
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TB_CFG_PKG_XDOMAIN_RESP);
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}
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/**
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* tb_register_protocol_handler() - Register protocol handler
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* @handler: Handler to register
|
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*
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* This allows XDomain service drivers to hook into incoming XDomain
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* messages. After this function is called the service driver needs to
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* be able to handle calls to callback whenever a package with the
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* registered protocol is received.
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*/
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int tb_register_protocol_handler(struct tb_protocol_handler *handler)
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{
|
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if (!handler->uuid || !handler->callback)
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return -EINVAL;
|
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if (uuid_equal(handler->uuid, &tb_xdp_uuid))
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return -EINVAL;
|
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mutex_lock(&xdomain_lock);
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list_add_tail(&handler->list, &protocol_handlers);
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mutex_unlock(&xdomain_lock);
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|
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return 0;
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}
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EXPORT_SYMBOL_GPL(tb_register_protocol_handler);
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|
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/**
|
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* tb_unregister_protocol_handler() - Unregister protocol handler
|
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* @handler: Handler to unregister
|
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*
|
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* Removes the previously registered protocol handler.
|
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*/
|
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void tb_unregister_protocol_handler(struct tb_protocol_handler *handler)
|
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{
|
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mutex_lock(&xdomain_lock);
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list_del_init(&handler->list);
|
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mutex_unlock(&xdomain_lock);
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}
|
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EXPORT_SYMBOL_GPL(tb_unregister_protocol_handler);
|
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|
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static void tb_xdp_handle_request(struct work_struct *work)
|
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{
|
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struct xdomain_request_work *xw = container_of(work, typeof(*xw), work);
|
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const struct tb_xdp_header *pkg = xw->pkg;
|
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const struct tb_xdomain_header *xhdr = &pkg->xd_hdr;
|
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struct tb *tb = xw->tb;
|
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struct tb_ctl *ctl = tb->ctl;
|
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const uuid_t *uuid;
|
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int ret = 0;
|
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u32 sequence;
|
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u64 route;
|
|
|
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route = ((u64)xhdr->route_hi << 32 | xhdr->route_lo) & ~BIT_ULL(63);
|
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sequence = xhdr->length_sn & TB_XDOMAIN_SN_MASK;
|
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sequence >>= TB_XDOMAIN_SN_SHIFT;
|
|
|
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mutex_lock(&tb->lock);
|
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if (tb->root_switch)
|
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uuid = tb->root_switch->uuid;
|
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else
|
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uuid = NULL;
|
|
mutex_unlock(&tb->lock);
|
|
|
|
if (!uuid) {
|
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tb_xdp_error_response(ctl, route, sequence, ERROR_NOT_READY);
|
|
goto out;
|
|
}
|
|
|
|
switch (pkg->type) {
|
|
case PROPERTIES_REQUEST:
|
|
ret = tb_xdp_properties_response(tb, ctl, route, sequence, uuid,
|
|
(const struct tb_xdp_properties *)pkg);
|
|
break;
|
|
|
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case PROPERTIES_CHANGED_REQUEST: {
|
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const struct tb_xdp_properties_changed *xchg =
|
|
(const struct tb_xdp_properties_changed *)pkg;
|
|
struct tb_xdomain *xd;
|
|
|
|
ret = tb_xdp_properties_changed_response(ctl, route, sequence);
|
|
|
|
/*
|
|
* Since the properties have been changed, let's update
|
|
* the xdomain related to this connection as well in
|
|
* case there is a change in services it offers.
|
|
*/
|
|
xd = tb_xdomain_find_by_uuid_locked(tb, &xchg->src_uuid);
|
|
if (xd) {
|
|
queue_delayed_work(tb->wq, &xd->get_properties_work,
|
|
msecs_to_jiffies(50));
|
|
tb_xdomain_put(xd);
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (ret) {
|
|
tb_warn(tb, "failed to send XDomain response for %#x\n",
|
|
pkg->type);
|
|
}
|
|
|
|
out:
|
|
kfree(xw->pkg);
|
|
kfree(xw);
|
|
}
|
|
|
|
static void
|
|
tb_xdp_schedule_request(struct tb *tb, const struct tb_xdp_header *hdr,
|
|
size_t size)
|
|
{
|
|
struct xdomain_request_work *xw;
|
|
|
|
xw = kmalloc(sizeof(*xw), GFP_KERNEL);
|
|
if (!xw)
|
|
return;
|
|
|
|
INIT_WORK(&xw->work, tb_xdp_handle_request);
|
|
xw->pkg = kmemdup(hdr, size, GFP_KERNEL);
|
|
xw->tb = tb;
|
|
|
|
queue_work(tb->wq, &xw->work);
|
|
}
|
|
|
|
/**
|
|
* tb_register_service_driver() - Register XDomain service driver
|
|
* @drv: Driver to register
|
|
*
|
|
* Registers new service driver from @drv to the bus.
|
|
*/
|
|
int tb_register_service_driver(struct tb_service_driver *drv)
|
|
{
|
|
drv->driver.bus = &tb_bus_type;
|
|
return driver_register(&drv->driver);
|
|
}
|
|
EXPORT_SYMBOL_GPL(tb_register_service_driver);
|
|
|
|
/**
|
|
* tb_unregister_service_driver() - Unregister XDomain service driver
|
|
* @xdrv: Driver to unregister
|
|
*
|
|
* Unregisters XDomain service driver from the bus.
|
|
*/
|
|
void tb_unregister_service_driver(struct tb_service_driver *drv)
|
|
{
|
|
driver_unregister(&drv->driver);
|
|
}
|
|
EXPORT_SYMBOL_GPL(tb_unregister_service_driver);
|
|
|
|
static ssize_t key_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct tb_service *svc = container_of(dev, struct tb_service, dev);
|
|
|
|
/*
|
|
* It should be null terminated but anything else is pretty much
|
|
* allowed.
|
|
*/
|
|
return sprintf(buf, "%*pEp\n", (int)strlen(svc->key), svc->key);
|
|
}
|
|
static DEVICE_ATTR_RO(key);
|
|
|
|
static int get_modalias(struct tb_service *svc, char *buf, size_t size)
|
|
{
|
|
return snprintf(buf, size, "tbsvc:k%sp%08Xv%08Xr%08X", svc->key,
|
|
svc->prtcid, svc->prtcvers, svc->prtcrevs);
|
|
}
|
|
|
|
static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct tb_service *svc = container_of(dev, struct tb_service, dev);
|
|
|
|
/* Full buffer size except new line and null termination */
|
|
get_modalias(svc, buf, PAGE_SIZE - 2);
|
|
return sprintf(buf, "%s\n", buf);
|
|
}
|
|
static DEVICE_ATTR_RO(modalias);
|
|
|
|
static ssize_t prtcid_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct tb_service *svc = container_of(dev, struct tb_service, dev);
|
|
|
|
return sprintf(buf, "%u\n", svc->prtcid);
|
|
}
|
|
static DEVICE_ATTR_RO(prtcid);
|
|
|
|
static ssize_t prtcvers_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct tb_service *svc = container_of(dev, struct tb_service, dev);
|
|
|
|
return sprintf(buf, "%u\n", svc->prtcvers);
|
|
}
|
|
static DEVICE_ATTR_RO(prtcvers);
|
|
|
|
static ssize_t prtcrevs_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct tb_service *svc = container_of(dev, struct tb_service, dev);
|
|
|
|
return sprintf(buf, "%u\n", svc->prtcrevs);
|
|
}
|
|
static DEVICE_ATTR_RO(prtcrevs);
|
|
|
|
static ssize_t prtcstns_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct tb_service *svc = container_of(dev, struct tb_service, dev);
|
|
|
|
return sprintf(buf, "0x%08x\n", svc->prtcstns);
|
|
}
|
|
static DEVICE_ATTR_RO(prtcstns);
|
|
|
|
static struct attribute *tb_service_attrs[] = {
|
|
&dev_attr_key.attr,
|
|
&dev_attr_modalias.attr,
|
|
&dev_attr_prtcid.attr,
|
|
&dev_attr_prtcvers.attr,
|
|
&dev_attr_prtcrevs.attr,
|
|
&dev_attr_prtcstns.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group tb_service_attr_group = {
|
|
.attrs = tb_service_attrs,
|
|
};
|
|
|
|
static const struct attribute_group *tb_service_attr_groups[] = {
|
|
&tb_service_attr_group,
|
|
NULL,
|
|
};
|
|
|
|
static int tb_service_uevent(struct device *dev, struct kobj_uevent_env *env)
|
|
{
|
|
struct tb_service *svc = container_of(dev, struct tb_service, dev);
|
|
char modalias[64];
|
|
|
|
get_modalias(svc, modalias, sizeof(modalias));
|
|
return add_uevent_var(env, "MODALIAS=%s", modalias);
|
|
}
|
|
|
|
static void tb_service_release(struct device *dev)
|
|
{
|
|
struct tb_service *svc = container_of(dev, struct tb_service, dev);
|
|
struct tb_xdomain *xd = tb_service_parent(svc);
|
|
|
|
ida_simple_remove(&xd->service_ids, svc->id);
|
|
kfree(svc->key);
|
|
kfree(svc);
|
|
}
|
|
|
|
struct device_type tb_service_type = {
|
|
.name = "thunderbolt_service",
|
|
.groups = tb_service_attr_groups,
|
|
.uevent = tb_service_uevent,
|
|
.release = tb_service_release,
|
|
};
|
|
EXPORT_SYMBOL_GPL(tb_service_type);
|
|
|
|
static int remove_missing_service(struct device *dev, void *data)
|
|
{
|
|
struct tb_xdomain *xd = data;
|
|
struct tb_service *svc;
|
|
|
|
svc = tb_to_service(dev);
|
|
if (!svc)
|
|
return 0;
|
|
|
|
if (!tb_property_find(xd->properties, svc->key,
|
|
TB_PROPERTY_TYPE_DIRECTORY))
|
|
device_unregister(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int find_service(struct device *dev, void *data)
|
|
{
|
|
const struct tb_property *p = data;
|
|
struct tb_service *svc;
|
|
|
|
svc = tb_to_service(dev);
|
|
if (!svc)
|
|
return 0;
|
|
|
|
return !strcmp(svc->key, p->key);
|
|
}
|
|
|
|
static int populate_service(struct tb_service *svc,
|
|
struct tb_property *property)
|
|
{
|
|
struct tb_property_dir *dir = property->value.dir;
|
|
struct tb_property *p;
|
|
|
|
/* Fill in standard properties */
|
|
p = tb_property_find(dir, "prtcid", TB_PROPERTY_TYPE_VALUE);
|
|
if (p)
|
|
svc->prtcid = p->value.immediate;
|
|
p = tb_property_find(dir, "prtcvers", TB_PROPERTY_TYPE_VALUE);
|
|
if (p)
|
|
svc->prtcvers = p->value.immediate;
|
|
p = tb_property_find(dir, "prtcrevs", TB_PROPERTY_TYPE_VALUE);
|
|
if (p)
|
|
svc->prtcrevs = p->value.immediate;
|
|
p = tb_property_find(dir, "prtcstns", TB_PROPERTY_TYPE_VALUE);
|
|
if (p)
|
|
svc->prtcstns = p->value.immediate;
|
|
|
|
svc->key = kstrdup(property->key, GFP_KERNEL);
|
|
if (!svc->key)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void enumerate_services(struct tb_xdomain *xd)
|
|
{
|
|
struct tb_service *svc;
|
|
struct tb_property *p;
|
|
struct device *dev;
|
|
|
|
/*
|
|
* First remove all services that are not available anymore in
|
|
* the updated property block.
|
|
*/
|
|
device_for_each_child_reverse(&xd->dev, xd, remove_missing_service);
|
|
|
|
/* Then re-enumerate properties creating new services as we go */
|
|
tb_property_for_each(xd->properties, p) {
|
|
if (p->type != TB_PROPERTY_TYPE_DIRECTORY)
|
|
continue;
|
|
|
|
/* If the service exists already we are fine */
|
|
dev = device_find_child(&xd->dev, p, find_service);
|
|
if (dev) {
|
|
put_device(dev);
|
|
continue;
|
|
}
|
|
|
|
svc = kzalloc(sizeof(*svc), GFP_KERNEL);
|
|
if (!svc)
|
|
break;
|
|
|
|
if (populate_service(svc, p)) {
|
|
kfree(svc);
|
|
break;
|
|
}
|
|
|
|
svc->id = ida_simple_get(&xd->service_ids, 0, 0, GFP_KERNEL);
|
|
svc->dev.bus = &tb_bus_type;
|
|
svc->dev.type = &tb_service_type;
|
|
svc->dev.parent = &xd->dev;
|
|
dev_set_name(&svc->dev, "%s.%d", dev_name(&xd->dev), svc->id);
|
|
|
|
if (device_register(&svc->dev)) {
|
|
put_device(&svc->dev);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int populate_properties(struct tb_xdomain *xd,
|
|
struct tb_property_dir *dir)
|
|
{
|
|
const struct tb_property *p;
|
|
|
|
/* Required properties */
|
|
p = tb_property_find(dir, "deviceid", TB_PROPERTY_TYPE_VALUE);
|
|
if (!p)
|
|
return -EINVAL;
|
|
xd->device = p->value.immediate;
|
|
|
|
p = tb_property_find(dir, "vendorid", TB_PROPERTY_TYPE_VALUE);
|
|
if (!p)
|
|
return -EINVAL;
|
|
xd->vendor = p->value.immediate;
|
|
|
|
kfree(xd->device_name);
|
|
xd->device_name = NULL;
|
|
kfree(xd->vendor_name);
|
|
xd->vendor_name = NULL;
|
|
|
|
/* Optional properties */
|
|
p = tb_property_find(dir, "deviceid", TB_PROPERTY_TYPE_TEXT);
|
|
if (p)
|
|
xd->device_name = kstrdup(p->value.text, GFP_KERNEL);
|
|
p = tb_property_find(dir, "vendorid", TB_PROPERTY_TYPE_TEXT);
|
|
if (p)
|
|
xd->vendor_name = kstrdup(p->value.text, GFP_KERNEL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Called with @xd->lock held */
|
|
static void tb_xdomain_restore_paths(struct tb_xdomain *xd)
|
|
{
|
|
if (!xd->resume)
|
|
return;
|
|
|
|
xd->resume = false;
|
|
if (xd->transmit_path) {
|
|
dev_dbg(&xd->dev, "re-establishing DMA path\n");
|
|
tb_domain_approve_xdomain_paths(xd->tb, xd);
|
|
}
|
|
}
|
|
|
|
static void tb_xdomain_get_properties(struct work_struct *work)
|
|
{
|
|
struct tb_xdomain *xd = container_of(work, typeof(*xd),
|
|
get_properties_work.work);
|
|
struct tb_property_dir *dir;
|
|
struct tb *tb = xd->tb;
|
|
bool update = false;
|
|
u32 *block = NULL;
|
|
u32 gen = 0;
|
|
int ret;
|
|
|
|
ret = tb_xdp_properties_request(tb->ctl, xd->route, xd->local_uuid,
|
|
xd->remote_uuid, xd->properties_retries,
|
|
&block, &gen);
|
|
if (ret < 0) {
|
|
if (xd->properties_retries-- > 0) {
|
|
queue_delayed_work(xd->tb->wq, &xd->get_properties_work,
|
|
msecs_to_jiffies(1000));
|
|
} else {
|
|
/* Give up now */
|
|
dev_err(&xd->dev,
|
|
"failed read XDomain properties from %pUb\n",
|
|
xd->remote_uuid);
|
|
}
|
|
return;
|
|
}
|
|
|
|
xd->properties_retries = XDOMAIN_PROPERTIES_RETRIES;
|
|
|
|
mutex_lock(&xd->lock);
|
|
|
|
/* Only accept newer generation properties */
|
|
if (xd->properties && gen <= xd->property_block_gen) {
|
|
/*
|
|
* On resume it is likely that the properties block is
|
|
* not changed (unless the other end added or removed
|
|
* services). However, we need to make sure the existing
|
|
* DMA paths are restored properly.
|
|
*/
|
|
tb_xdomain_restore_paths(xd);
|
|
goto err_free_block;
|
|
}
|
|
|
|
dir = tb_property_parse_dir(block, ret);
|
|
if (!dir) {
|
|
dev_err(&xd->dev, "failed to parse XDomain properties\n");
|
|
goto err_free_block;
|
|
}
|
|
|
|
ret = populate_properties(xd, dir);
|
|
if (ret) {
|
|
dev_err(&xd->dev, "missing XDomain properties in response\n");
|
|
goto err_free_dir;
|
|
}
|
|
|
|
/* Release the existing one */
|
|
if (xd->properties) {
|
|
tb_property_free_dir(xd->properties);
|
|
update = true;
|
|
}
|
|
|
|
xd->properties = dir;
|
|
xd->property_block_gen = gen;
|
|
|
|
tb_xdomain_restore_paths(xd);
|
|
|
|
mutex_unlock(&xd->lock);
|
|
|
|
kfree(block);
|
|
|
|
/*
|
|
* Now the device should be ready enough so we can add it to the
|
|
* bus and let userspace know about it. If the device is already
|
|
* registered, we notify the userspace that it has changed.
|
|
*/
|
|
if (!update) {
|
|
if (device_add(&xd->dev)) {
|
|
dev_err(&xd->dev, "failed to add XDomain device\n");
|
|
return;
|
|
}
|
|
} else {
|
|
kobject_uevent(&xd->dev.kobj, KOBJ_CHANGE);
|
|
}
|
|
|
|
enumerate_services(xd);
|
|
return;
|
|
|
|
err_free_dir:
|
|
tb_property_free_dir(dir);
|
|
err_free_block:
|
|
kfree(block);
|
|
mutex_unlock(&xd->lock);
|
|
}
|
|
|
|
static void tb_xdomain_properties_changed(struct work_struct *work)
|
|
{
|
|
struct tb_xdomain *xd = container_of(work, typeof(*xd),
|
|
properties_changed_work.work);
|
|
int ret;
|
|
|
|
ret = tb_xdp_properties_changed_request(xd->tb->ctl, xd->route,
|
|
xd->properties_changed_retries, xd->local_uuid);
|
|
if (ret) {
|
|
if (xd->properties_changed_retries-- > 0)
|
|
queue_delayed_work(xd->tb->wq,
|
|
&xd->properties_changed_work,
|
|
msecs_to_jiffies(1000));
|
|
return;
|
|
}
|
|
|
|
xd->properties_changed_retries = XDOMAIN_PROPERTIES_CHANGED_RETRIES;
|
|
}
|
|
|
|
static ssize_t device_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev);
|
|
|
|
return sprintf(buf, "%#x\n", xd->device);
|
|
}
|
|
static DEVICE_ATTR_RO(device);
|
|
|
|
static ssize_t
|
|
device_name_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev);
|
|
int ret;
|
|
|
|
if (mutex_lock_interruptible(&xd->lock))
|
|
return -ERESTARTSYS;
|
|
ret = sprintf(buf, "%s\n", xd->device_name ? xd->device_name : "");
|
|
mutex_unlock(&xd->lock);
|
|
|
|
return ret;
|
|
}
|
|
static DEVICE_ATTR_RO(device_name);
|
|
|
|
static ssize_t vendor_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev);
|
|
|
|
return sprintf(buf, "%#x\n", xd->vendor);
|
|
}
|
|
static DEVICE_ATTR_RO(vendor);
|
|
|
|
static ssize_t
|
|
vendor_name_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev);
|
|
int ret;
|
|
|
|
if (mutex_lock_interruptible(&xd->lock))
|
|
return -ERESTARTSYS;
|
|
ret = sprintf(buf, "%s\n", xd->vendor_name ? xd->vendor_name : "");
|
|
mutex_unlock(&xd->lock);
|
|
|
|
return ret;
|
|
}
|
|
static DEVICE_ATTR_RO(vendor_name);
|
|
|
|
static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev);
|
|
|
|
return sprintf(buf, "%pUb\n", xd->remote_uuid);
|
|
}
|
|
static DEVICE_ATTR_RO(unique_id);
|
|
|
|
static struct attribute *xdomain_attrs[] = {
|
|
&dev_attr_device.attr,
|
|
&dev_attr_device_name.attr,
|
|
&dev_attr_unique_id.attr,
|
|
&dev_attr_vendor.attr,
|
|
&dev_attr_vendor_name.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group xdomain_attr_group = {
|
|
.attrs = xdomain_attrs,
|
|
};
|
|
|
|
static const struct attribute_group *xdomain_attr_groups[] = {
|
|
&xdomain_attr_group,
|
|
NULL,
|
|
};
|
|
|
|
static void tb_xdomain_release(struct device *dev)
|
|
{
|
|
struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev);
|
|
|
|
put_device(xd->dev.parent);
|
|
|
|
tb_property_free_dir(xd->properties);
|
|
ida_destroy(&xd->service_ids);
|
|
|
|
kfree(xd->local_uuid);
|
|
kfree(xd->remote_uuid);
|
|
kfree(xd->device_name);
|
|
kfree(xd->vendor_name);
|
|
kfree(xd);
|
|
}
|
|
|
|
static void start_handshake(struct tb_xdomain *xd)
|
|
{
|
|
xd->properties_retries = XDOMAIN_PROPERTIES_RETRIES;
|
|
xd->properties_changed_retries = XDOMAIN_PROPERTIES_CHANGED_RETRIES;
|
|
|
|
/* Start exchanging properties with the other host */
|
|
queue_delayed_work(xd->tb->wq, &xd->properties_changed_work,
|
|
msecs_to_jiffies(100));
|
|
queue_delayed_work(xd->tb->wq, &xd->get_properties_work,
|
|
msecs_to_jiffies(1000));
|
|
}
|
|
|
|
static void stop_handshake(struct tb_xdomain *xd)
|
|
{
|
|
xd->properties_retries = 0;
|
|
xd->properties_changed_retries = 0;
|
|
|
|
cancel_delayed_work_sync(&xd->get_properties_work);
|
|
cancel_delayed_work_sync(&xd->properties_changed_work);
|
|
}
|
|
|
|
static int __maybe_unused tb_xdomain_suspend(struct device *dev)
|
|
{
|
|
stop_handshake(tb_to_xdomain(dev));
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused tb_xdomain_resume(struct device *dev)
|
|
{
|
|
struct tb_xdomain *xd = tb_to_xdomain(dev);
|
|
|
|
/*
|
|
* Ask tb_xdomain_get_properties() restore any existing DMA
|
|
* paths after properties are re-read.
|
|
*/
|
|
xd->resume = true;
|
|
start_handshake(xd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct dev_pm_ops tb_xdomain_pm_ops = {
|
|
SET_SYSTEM_SLEEP_PM_OPS(tb_xdomain_suspend, tb_xdomain_resume)
|
|
};
|
|
|
|
struct device_type tb_xdomain_type = {
|
|
.name = "thunderbolt_xdomain",
|
|
.release = tb_xdomain_release,
|
|
.pm = &tb_xdomain_pm_ops,
|
|
};
|
|
EXPORT_SYMBOL_GPL(tb_xdomain_type);
|
|
|
|
/**
|
|
* tb_xdomain_alloc() - Allocate new XDomain object
|
|
* @tb: Domain where the XDomain belongs
|
|
* @parent: Parent device (the switch through the connection to the
|
|
* other domain is reached).
|
|
* @route: Route string used to reach the other domain
|
|
* @local_uuid: Our local domain UUID
|
|
* @remote_uuid: UUID of the other domain
|
|
*
|
|
* Allocates new XDomain structure and returns pointer to that. The
|
|
* object must be released by calling tb_xdomain_put().
|
|
*/
|
|
struct tb_xdomain *tb_xdomain_alloc(struct tb *tb, struct device *parent,
|
|
u64 route, const uuid_t *local_uuid,
|
|
const uuid_t *remote_uuid)
|
|
{
|
|
struct tb_xdomain *xd;
|
|
|
|
xd = kzalloc(sizeof(*xd), GFP_KERNEL);
|
|
if (!xd)
|
|
return NULL;
|
|
|
|
xd->tb = tb;
|
|
xd->route = route;
|
|
ida_init(&xd->service_ids);
|
|
mutex_init(&xd->lock);
|
|
INIT_DELAYED_WORK(&xd->get_properties_work, tb_xdomain_get_properties);
|
|
INIT_DELAYED_WORK(&xd->properties_changed_work,
|
|
tb_xdomain_properties_changed);
|
|
|
|
xd->local_uuid = kmemdup(local_uuid, sizeof(uuid_t), GFP_KERNEL);
|
|
if (!xd->local_uuid)
|
|
goto err_free;
|
|
|
|
xd->remote_uuid = kmemdup(remote_uuid, sizeof(uuid_t), GFP_KERNEL);
|
|
if (!xd->remote_uuid)
|
|
goto err_free_local_uuid;
|
|
|
|
device_initialize(&xd->dev);
|
|
xd->dev.parent = get_device(parent);
|
|
xd->dev.bus = &tb_bus_type;
|
|
xd->dev.type = &tb_xdomain_type;
|
|
xd->dev.groups = xdomain_attr_groups;
|
|
dev_set_name(&xd->dev, "%u-%llx", tb->index, route);
|
|
|
|
/*
|
|
* This keeps the DMA powered on as long as we have active
|
|
* connection to another host.
|
|
*/
|
|
pm_runtime_set_active(&xd->dev);
|
|
pm_runtime_get_noresume(&xd->dev);
|
|
pm_runtime_enable(&xd->dev);
|
|
|
|
return xd;
|
|
|
|
err_free_local_uuid:
|
|
kfree(xd->local_uuid);
|
|
err_free:
|
|
kfree(xd);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* tb_xdomain_add() - Add XDomain to the bus
|
|
* @xd: XDomain to add
|
|
*
|
|
* This function starts XDomain discovery protocol handshake and
|
|
* eventually adds the XDomain to the bus. After calling this function
|
|
* the caller needs to call tb_xdomain_remove() in order to remove and
|
|
* release the object regardless whether the handshake succeeded or not.
|
|
*/
|
|
void tb_xdomain_add(struct tb_xdomain *xd)
|
|
{
|
|
/* Start exchanging properties with the other host */
|
|
start_handshake(xd);
|
|
}
|
|
|
|
static int unregister_service(struct device *dev, void *data)
|
|
{
|
|
device_unregister(dev);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tb_xdomain_remove() - Remove XDomain from the bus
|
|
* @xd: XDomain to remove
|
|
*
|
|
* This will stop all ongoing configuration work and remove the XDomain
|
|
* along with any services from the bus. When the last reference to @xd
|
|
* is released the object will be released as well.
|
|
*/
|
|
void tb_xdomain_remove(struct tb_xdomain *xd)
|
|
{
|
|
stop_handshake(xd);
|
|
|
|
device_for_each_child_reverse(&xd->dev, xd, unregister_service);
|
|
|
|
/*
|
|
* Undo runtime PM here explicitly because it is possible that
|
|
* the XDomain was never added to the bus and thus device_del()
|
|
* is not called for it (device_del() would handle this otherwise).
|
|
*/
|
|
pm_runtime_disable(&xd->dev);
|
|
pm_runtime_put_noidle(&xd->dev);
|
|
pm_runtime_set_suspended(&xd->dev);
|
|
|
|
if (!device_is_registered(&xd->dev))
|
|
put_device(&xd->dev);
|
|
else
|
|
device_unregister(&xd->dev);
|
|
}
|
|
|
|
/**
|
|
* tb_xdomain_enable_paths() - Enable DMA paths for XDomain connection
|
|
* @xd: XDomain connection
|
|
* @transmit_path: HopID of the transmit path the other end is using to
|
|
* send packets
|
|
* @transmit_ring: DMA ring used to receive packets from the other end
|
|
* @receive_path: HopID of the receive path the other end is using to
|
|
* receive packets
|
|
* @receive_ring: DMA ring used to send packets to the other end
|
|
*
|
|
* The function enables DMA paths accordingly so that after successful
|
|
* return the caller can send and receive packets using high-speed DMA
|
|
* path.
|
|
*
|
|
* Return: %0 in case of success and negative errno in case of error
|
|
*/
|
|
int tb_xdomain_enable_paths(struct tb_xdomain *xd, u16 transmit_path,
|
|
u16 transmit_ring, u16 receive_path,
|
|
u16 receive_ring)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&xd->lock);
|
|
|
|
if (xd->transmit_path) {
|
|
ret = xd->transmit_path == transmit_path ? 0 : -EBUSY;
|
|
goto exit_unlock;
|
|
}
|
|
|
|
xd->transmit_path = transmit_path;
|
|
xd->transmit_ring = transmit_ring;
|
|
xd->receive_path = receive_path;
|
|
xd->receive_ring = receive_ring;
|
|
|
|
ret = tb_domain_approve_xdomain_paths(xd->tb, xd);
|
|
|
|
exit_unlock:
|
|
mutex_unlock(&xd->lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tb_xdomain_enable_paths);
|
|
|
|
/**
|
|
* tb_xdomain_disable_paths() - Disable DMA paths for XDomain connection
|
|
* @xd: XDomain connection
|
|
*
|
|
* This does the opposite of tb_xdomain_enable_paths(). After call to
|
|
* this the caller is not expected to use the rings anymore.
|
|
*
|
|
* Return: %0 in case of success and negative errno in case of error
|
|
*/
|
|
int tb_xdomain_disable_paths(struct tb_xdomain *xd)
|
|
{
|
|
int ret = 0;
|
|
|
|
mutex_lock(&xd->lock);
|
|
if (xd->transmit_path) {
|
|
xd->transmit_path = 0;
|
|
xd->transmit_ring = 0;
|
|
xd->receive_path = 0;
|
|
xd->receive_ring = 0;
|
|
|
|
ret = tb_domain_disconnect_xdomain_paths(xd->tb, xd);
|
|
}
|
|
mutex_unlock(&xd->lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tb_xdomain_disable_paths);
|
|
|
|
struct tb_xdomain_lookup {
|
|
const uuid_t *uuid;
|
|
u8 link;
|
|
u8 depth;
|
|
u64 route;
|
|
};
|
|
|
|
static struct tb_xdomain *switch_find_xdomain(struct tb_switch *sw,
|
|
const struct tb_xdomain_lookup *lookup)
|
|
{
|
|
int i;
|
|
|
|
for (i = 1; i <= sw->config.max_port_number; i++) {
|
|
struct tb_port *port = &sw->ports[i];
|
|
struct tb_xdomain *xd;
|
|
|
|
if (tb_is_upstream_port(port))
|
|
continue;
|
|
|
|
if (port->xdomain) {
|
|
xd = port->xdomain;
|
|
|
|
if (lookup->uuid) {
|
|
if (uuid_equal(xd->remote_uuid, lookup->uuid))
|
|
return xd;
|
|
} else if (lookup->link &&
|
|
lookup->link == xd->link &&
|
|
lookup->depth == xd->depth) {
|
|
return xd;
|
|
} else if (lookup->route &&
|
|
lookup->route == xd->route) {
|
|
return xd;
|
|
}
|
|
} else if (port->remote) {
|
|
xd = switch_find_xdomain(port->remote->sw, lookup);
|
|
if (xd)
|
|
return xd;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* tb_xdomain_find_by_uuid() - Find an XDomain by UUID
|
|
* @tb: Domain where the XDomain belongs to
|
|
* @uuid: UUID to look for
|
|
*
|
|
* Finds XDomain by walking through the Thunderbolt topology below @tb.
|
|
* The returned XDomain will have its reference count increased so the
|
|
* caller needs to call tb_xdomain_put() when it is done with the
|
|
* object.
|
|
*
|
|
* This will find all XDomains including the ones that are not yet added
|
|
* to the bus (handshake is still in progress).
|
|
*
|
|
* The caller needs to hold @tb->lock.
|
|
*/
|
|
struct tb_xdomain *tb_xdomain_find_by_uuid(struct tb *tb, const uuid_t *uuid)
|
|
{
|
|
struct tb_xdomain_lookup lookup;
|
|
struct tb_xdomain *xd;
|
|
|
|
memset(&lookup, 0, sizeof(lookup));
|
|
lookup.uuid = uuid;
|
|
|
|
xd = switch_find_xdomain(tb->root_switch, &lookup);
|
|
return tb_xdomain_get(xd);
|
|
}
|
|
EXPORT_SYMBOL_GPL(tb_xdomain_find_by_uuid);
|
|
|
|
/**
|
|
* tb_xdomain_find_by_link_depth() - Find an XDomain by link and depth
|
|
* @tb: Domain where the XDomain belongs to
|
|
* @link: Root switch link number
|
|
* @depth: Depth in the link
|
|
*
|
|
* Finds XDomain by walking through the Thunderbolt topology below @tb.
|
|
* The returned XDomain will have its reference count increased so the
|
|
* caller needs to call tb_xdomain_put() when it is done with the
|
|
* object.
|
|
*
|
|
* This will find all XDomains including the ones that are not yet added
|
|
* to the bus (handshake is still in progress).
|
|
*
|
|
* The caller needs to hold @tb->lock.
|
|
*/
|
|
struct tb_xdomain *tb_xdomain_find_by_link_depth(struct tb *tb, u8 link,
|
|
u8 depth)
|
|
{
|
|
struct tb_xdomain_lookup lookup;
|
|
struct tb_xdomain *xd;
|
|
|
|
memset(&lookup, 0, sizeof(lookup));
|
|
lookup.link = link;
|
|
lookup.depth = depth;
|
|
|
|
xd = switch_find_xdomain(tb->root_switch, &lookup);
|
|
return tb_xdomain_get(xd);
|
|
}
|
|
|
|
/**
|
|
* tb_xdomain_find_by_route() - Find an XDomain by route string
|
|
* @tb: Domain where the XDomain belongs to
|
|
* @route: XDomain route string
|
|
*
|
|
* Finds XDomain by walking through the Thunderbolt topology below @tb.
|
|
* The returned XDomain will have its reference count increased so the
|
|
* caller needs to call tb_xdomain_put() when it is done with the
|
|
* object.
|
|
*
|
|
* This will find all XDomains including the ones that are not yet added
|
|
* to the bus (handshake is still in progress).
|
|
*
|
|
* The caller needs to hold @tb->lock.
|
|
*/
|
|
struct tb_xdomain *tb_xdomain_find_by_route(struct tb *tb, u64 route)
|
|
{
|
|
struct tb_xdomain_lookup lookup;
|
|
struct tb_xdomain *xd;
|
|
|
|
memset(&lookup, 0, sizeof(lookup));
|
|
lookup.route = route;
|
|
|
|
xd = switch_find_xdomain(tb->root_switch, &lookup);
|
|
return tb_xdomain_get(xd);
|
|
}
|
|
EXPORT_SYMBOL_GPL(tb_xdomain_find_by_route);
|
|
|
|
bool tb_xdomain_handle_request(struct tb *tb, enum tb_cfg_pkg_type type,
|
|
const void *buf, size_t size)
|
|
{
|
|
const struct tb_protocol_handler *handler, *tmp;
|
|
const struct tb_xdp_header *hdr = buf;
|
|
unsigned int length;
|
|
int ret = 0;
|
|
|
|
/* We expect the packet is at least size of the header */
|
|
length = hdr->xd_hdr.length_sn & TB_XDOMAIN_LENGTH_MASK;
|
|
if (length != size / 4 - sizeof(hdr->xd_hdr) / 4)
|
|
return true;
|
|
if (length < sizeof(*hdr) / 4 - sizeof(hdr->xd_hdr) / 4)
|
|
return true;
|
|
|
|
/*
|
|
* Handle XDomain discovery protocol packets directly here. For
|
|
* other protocols (based on their UUID) we call registered
|
|
* handlers in turn.
|
|
*/
|
|
if (uuid_equal(&hdr->uuid, &tb_xdp_uuid)) {
|
|
if (type == TB_CFG_PKG_XDOMAIN_REQ) {
|
|
tb_xdp_schedule_request(tb, hdr, size);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
mutex_lock(&xdomain_lock);
|
|
list_for_each_entry_safe(handler, tmp, &protocol_handlers, list) {
|
|
if (!uuid_equal(&hdr->uuid, handler->uuid))
|
|
continue;
|
|
|
|
mutex_unlock(&xdomain_lock);
|
|
ret = handler->callback(buf, size, handler->data);
|
|
mutex_lock(&xdomain_lock);
|
|
|
|
if (ret)
|
|
break;
|
|
}
|
|
mutex_unlock(&xdomain_lock);
|
|
|
|
return ret > 0;
|
|
}
|
|
|
|
static int rebuild_property_block(void)
|
|
{
|
|
u32 *block, len;
|
|
int ret;
|
|
|
|
ret = tb_property_format_dir(xdomain_property_dir, NULL, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
len = ret;
|
|
|
|
block = kcalloc(len, sizeof(u32), GFP_KERNEL);
|
|
if (!block)
|
|
return -ENOMEM;
|
|
|
|
ret = tb_property_format_dir(xdomain_property_dir, block, len);
|
|
if (ret) {
|
|
kfree(block);
|
|
return ret;
|
|
}
|
|
|
|
kfree(xdomain_property_block);
|
|
xdomain_property_block = block;
|
|
xdomain_property_block_len = len;
|
|
xdomain_property_block_gen++;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int update_xdomain(struct device *dev, void *data)
|
|
{
|
|
struct tb_xdomain *xd;
|
|
|
|
xd = tb_to_xdomain(dev);
|
|
if (xd) {
|
|
queue_delayed_work(xd->tb->wq, &xd->properties_changed_work,
|
|
msecs_to_jiffies(50));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void update_all_xdomains(void)
|
|
{
|
|
bus_for_each_dev(&tb_bus_type, NULL, NULL, update_xdomain);
|
|
}
|
|
|
|
static bool remove_directory(const char *key, const struct tb_property_dir *dir)
|
|
{
|
|
struct tb_property *p;
|
|
|
|
p = tb_property_find(xdomain_property_dir, key,
|
|
TB_PROPERTY_TYPE_DIRECTORY);
|
|
if (p && p->value.dir == dir) {
|
|
tb_property_remove(p);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* tb_register_property_dir() - Register property directory to the host
|
|
* @key: Key (name) of the directory to add
|
|
* @dir: Directory to add
|
|
*
|
|
* Service drivers can use this function to add new property directory
|
|
* to the host available properties. The other connected hosts are
|
|
* notified so they can re-read properties of this host if they are
|
|
* interested.
|
|
*
|
|
* Return: %0 on success and negative errno on failure
|
|
*/
|
|
int tb_register_property_dir(const char *key, struct tb_property_dir *dir)
|
|
{
|
|
int ret;
|
|
|
|
if (WARN_ON(!xdomain_property_dir))
|
|
return -EAGAIN;
|
|
|
|
if (!key || strlen(key) > 8)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&xdomain_lock);
|
|
if (tb_property_find(xdomain_property_dir, key,
|
|
TB_PROPERTY_TYPE_DIRECTORY)) {
|
|
ret = -EEXIST;
|
|
goto err_unlock;
|
|
}
|
|
|
|
ret = tb_property_add_dir(xdomain_property_dir, key, dir);
|
|
if (ret)
|
|
goto err_unlock;
|
|
|
|
ret = rebuild_property_block();
|
|
if (ret) {
|
|
remove_directory(key, dir);
|
|
goto err_unlock;
|
|
}
|
|
|
|
mutex_unlock(&xdomain_lock);
|
|
update_all_xdomains();
|
|
return 0;
|
|
|
|
err_unlock:
|
|
mutex_unlock(&xdomain_lock);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tb_register_property_dir);
|
|
|
|
/**
|
|
* tb_unregister_property_dir() - Removes property directory from host
|
|
* @key: Key (name) of the directory
|
|
* @dir: Directory to remove
|
|
*
|
|
* This will remove the existing directory from this host and notify the
|
|
* connected hosts about the change.
|
|
*/
|
|
void tb_unregister_property_dir(const char *key, struct tb_property_dir *dir)
|
|
{
|
|
int ret = 0;
|
|
|
|
mutex_lock(&xdomain_lock);
|
|
if (remove_directory(key, dir))
|
|
ret = rebuild_property_block();
|
|
mutex_unlock(&xdomain_lock);
|
|
|
|
if (!ret)
|
|
update_all_xdomains();
|
|
}
|
|
EXPORT_SYMBOL_GPL(tb_unregister_property_dir);
|
|
|
|
int tb_xdomain_init(void)
|
|
{
|
|
int ret;
|
|
|
|
xdomain_property_dir = tb_property_create_dir(NULL);
|
|
if (!xdomain_property_dir)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* Initialize standard set of properties without any service
|
|
* directories. Those will be added by service drivers
|
|
* themselves when they are loaded.
|
|
*/
|
|
tb_property_add_immediate(xdomain_property_dir, "vendorid",
|
|
PCI_VENDOR_ID_INTEL);
|
|
tb_property_add_text(xdomain_property_dir, "vendorid", "Intel Corp.");
|
|
tb_property_add_immediate(xdomain_property_dir, "deviceid", 0x1);
|
|
tb_property_add_text(xdomain_property_dir, "deviceid",
|
|
utsname()->nodename);
|
|
tb_property_add_immediate(xdomain_property_dir, "devicerv", 0x80000100);
|
|
|
|
ret = rebuild_property_block();
|
|
if (ret) {
|
|
tb_property_free_dir(xdomain_property_dir);
|
|
xdomain_property_dir = NULL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void tb_xdomain_exit(void)
|
|
{
|
|
kfree(xdomain_property_block);
|
|
tb_property_free_dir(xdomain_property_dir);
|
|
}
|