drivers/thunderbolt/ctl.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Thunderbolt driver - control channel and configuration commands
   4  *
   5  * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
   6  * Copyright (C) 2018, Intel Corporation
   7  */
   8
   9 #ifndef _TB_CFG
  10 #define _TB_CFG
  11
  12 #include <linux/kref.h>
  13 #include <linux/thunderbolt.h>
  14
  15 #include "nhi.h"
  16 #include "tb_msgs.h"
  17
  18 /* control channel */
  19 struct tb_ctl;
  20
  21 typedef bool (*event_cb)(void *data, enum tb_cfg_pkg_type type,
  22                          const void *buf, size_t size);
  23
  24 struct tb_ctl *tb_ctl_alloc(struct tb_nhi *nhi, event_cb cb, void *cb_data);
  25 void tb_ctl_start(struct tb_ctl *ctl);
  26 void tb_ctl_stop(struct tb_ctl *ctl);
  27 void tb_ctl_free(struct tb_ctl *ctl);
  28
  29 /* configuration commands */
  30
  31 #define TB_CFG_DEFAULT_TIMEOUT 5000 /* msec */
  32
  33 struct tb_cfg_result {
  34         u64 response_route;
  35         u32 response_port; /*
  36                             * If err = 1 then this is the port that send the
  37                             * error.
  38                             * If err = 0 and if this was a cfg_read/write then
  39                             * this is the the upstream port of the responding
  40                             * switch.
  41                             * Otherwise the field is set to zero.
  42                             */
  43         int err; /* negative errors, 0 for success, 1 for tb errors */
  44         enum tb_cfg_error tb_error; /* valid if err == 1 */
  45 };
  46
  47 struct ctl_pkg {
  48         struct tb_ctl *ctl;
  49         void *buffer;
  50         struct ring_frame frame;
  51 };
  52
  53 /**
  54  * struct tb_cfg_request - Control channel request
  55  * @kref: Reference count
  56  * @ctl: Pointer to the control channel structure. Only set when the
  57  *       request is queued.
  58  * @request_size: Size of the request packet (in bytes)
  59  * @request_type: Type of the request packet
  60  * @response: Response is stored here
  61  * @response_size: Maximum size of one response packet
  62  * @response_type: Expected type of the response packet
  63  * @npackets: Number of packets expected to be returned with this request
  64  * @match: Function used to match the incoming packet
  65  * @copy: Function used to copy the incoming packet to @response
  66  * @callback: Callback called when the request is finished successfully
  67  * @callback_data: Data to be passed to @callback
  68  * @flags: Flags for the request
  69  * @work: Work item used to complete the request
  70  * @result: Result after the request has been completed
  71  * @list: Requests are queued using this field
  72  *
  73  * An arbitrary request over Thunderbolt control channel. For standard
  74  * control channel message, one should use tb_cfg_read/write() and
  75  * friends if possible.
  76  */
  77 struct tb_cfg_request {
  78         struct kref kref;
  79         struct tb_ctl *ctl;
  80         const void *request;
  81         size_t request_size;
  82         enum tb_cfg_pkg_type request_type;
  83         void *response;
  84         size_t response_size;
  85         enum tb_cfg_pkg_type response_type;
  86         size_t npackets;
  87         bool (*match)(const struct tb_cfg_request *req,
  88                       const struct ctl_pkg *pkg);
  89         bool (*copy)(struct tb_cfg_request *req, const struct ctl_pkg *pkg);
  90         void (*callback)(void *callback_data);
  91         void *callback_data;
  92         unsigned long flags;
  93         struct work_struct work;
  94         struct tb_cfg_result result;
  95         struct list_head list;
  96 };
  97
  98 #define TB_CFG_REQUEST_ACTIVE           0
  99 #define TB_CFG_REQUEST_CANCELED         1
 100
 101 struct tb_cfg_request *tb_cfg_request_alloc(void);
 102 void tb_cfg_request_get(struct tb_cfg_request *req);
 103 void tb_cfg_request_put(struct tb_cfg_request *req);
 104 int tb_cfg_request(struct tb_ctl *ctl, struct tb_cfg_request *req,
 105                    void (*callback)(void *), void *callback_data);
 106 void tb_cfg_request_cancel(struct tb_cfg_request *req, int err);
 107 struct tb_cfg_result tb_cfg_request_sync(struct tb_ctl *ctl,
 108                         struct tb_cfg_request *req, int timeout_msec);
 109
 110 static inline u64 tb_cfg_get_route(const struct tb_cfg_header *header)
 111 {
 112         return (u64) header->route_hi << 32 | header->route_lo;
 113 }
 114
 115 static inline struct tb_cfg_header tb_cfg_make_header(u64 route)
 116 {
 117         struct tb_cfg_header header = {
 118                 .route_hi = route >> 32,
 119                 .route_lo = route,
 120         };
 121         /* check for overflow, route_hi is not 32 bits! */
 122         WARN_ON(tb_cfg_get_route(&header) != route);
 123         return header;
 124 }
 125
 126 int tb_cfg_ack_plug(struct tb_ctl *ctl, u64 route, u32 port, bool unplug);
 127 struct tb_cfg_result tb_cfg_reset(struct tb_ctl *ctl, u64 route,
 128                                   int timeout_msec);
 129 struct tb_cfg_result tb_cfg_read_raw(struct tb_ctl *ctl, void *buffer,
 130                                      u64 route, u32 port,
 131                                      enum tb_cfg_space space, u32 offset,
 132                                      u32 length, int timeout_msec);
 133 struct tb_cfg_result tb_cfg_write_raw(struct tb_ctl *ctl, const void *buffer,
 134                                       u64 route, u32 port,
 135                                       enum tb_cfg_space space, u32 offset,
 136                                       u32 length, int timeout_msec);
 137 int tb_cfg_read(struct tb_ctl *ctl, void *buffer, u64 route, u32 port,
 138                 enum tb_cfg_space space, u32 offset, u32 length);
 139 int tb_cfg_write(struct tb_ctl *ctl, const void *buffer, u64 route, u32 port,
 140                  enum tb_cfg_space space, u32 offset, u32 length);
 141 int tb_cfg_get_upstream_port(struct tb_ctl *ctl, u64 route);
 142
 143
 144 #endif