1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Thunderbolt driver - bus logic (NHI independent)
4 *
5 * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
6 * Copyright (C) 2018, Intel Corporation
7 */
8
9 #ifndef TB_H_
10 #define TB_H_
11
12 #include <linux/nvmem-provider.h>
13 #include <linux/pci.h>
14 #include <linux/thunderbolt.h>
15 #include <linux/uuid.h>
16
17 #include "tb_regs.h"
18 #include "ctl.h"
19 #include "dma_port.h"
20
21 #define NVM_MIN_SIZE SZ_32K
22 #define NVM_MAX_SIZE SZ_512K
23
24 /* Intel specific NVM offsets */
25 #define NVM_DEVID 0x05
26 #define NVM_VERSION 0x08
27 #define NVM_FLASH_SIZE 0x45
28
29 /**
30 * struct tb_nvm - Structure holding NVM information
31 * @dev: Owner of the NVM
32 * @major: Major version number of the active NVM portion
33 * @minor: Minor version number of the active NVM portion
34 * @id: Identifier used with both NVM portions
35 * @active: Active portion NVMem device
36 * @non_active: Non-active portion NVMem device
37 * @buf: Buffer where the NVM image is stored before it is written to
38 * the actual NVM flash device
39 * @buf_data_size: Number of bytes actually consumed by the new NVM
40 * image
41 * @authenticating: The device is authenticating the new NVM
42 * @flushed: The image has been flushed to the storage area
43 *
44 * The user of this structure needs to handle serialization of possible
45 * concurrent access.
46 */
47 struct tb_nvm {
48 struct device *dev;
49 u8 major;
50 u8 minor;
51 int id;
52 struct nvmem_device *active;
53 struct nvmem_device *non_active;
54 void *buf;
55 size_t buf_data_size;
56 bool authenticating;
57 bool flushed;
58 };
59
60 #define TB_SWITCH_KEY_SIZE 32
61 #define TB_SWITCH_MAX_DEPTH 6
62 #define USB4_SWITCH_MAX_DEPTH 5
63
64 /**
65 * enum tb_switch_tmu_rate - TMU refresh rate
66 * @TB_SWITCH_TMU_RATE_OFF: %0 (Disable Time Sync handshake)
67 * @TB_SWITCH_TMU_RATE_HIFI: %16 us time interval between successive
68 * transmission of the Delay Request TSNOS
69 * (Time Sync Notification Ordered Set) on a Link
70 * @TB_SWITCH_TMU_RATE_NORMAL: %1 ms time interval between successive
71 * transmission of the Delay Request TSNOS on
72 * a Link
73 */
74 enum tb_switch_tmu_rate {
75 TB_SWITCH_TMU_RATE_OFF = 0,
76 TB_SWITCH_TMU_RATE_HIFI = 16,
77 TB_SWITCH_TMU_RATE_NORMAL = 1000,
78 };
79
80 /**
81 * struct tb_switch_tmu - Structure holding switch TMU configuration
82 * @cap: Offset to the TMU capability (%0 if not found)
83 * @has_ucap: Does the switch support uni-directional mode
84 * @rate: TMU refresh rate related to upstream switch. In case of root
85 * switch this holds the domain rate.
86 * @unidirectional: Is the TMU in uni-directional or bi-directional mode
87 * related to upstream switch. Don't case for root switch.
88 */
89 struct tb_switch_tmu {
90 int cap;
91 bool has_ucap;
92 enum tb_switch_tmu_rate rate;
93 bool unidirectional;
94 };
95
96 /**
97 * struct tb_switch - a thunderbolt switch
98 * @dev: Device for the switch
99 * @config: Switch configuration
100 * @ports: Ports in this switch
101 * @dma_port: If the switch has port supporting DMA configuration based
102 * mailbox this will hold the pointer to that (%NULL
103 * otherwise). If set it also means the switch has
104 * upgradeable NVM.
105 * @tmu: The switch TMU configuration
106 * @tb: Pointer to the domain the switch belongs to
107 * @uid: Unique ID of the switch
108 * @uuid: UUID of the switch (or %NULL if not supported)
109 * @vendor: Vendor ID of the switch
110 * @device: Device ID of the switch
111 * @vendor_name: Name of the vendor (or %NULL if not known)
112 * @device_name: Name of the device (or %NULL if not known)
113 * @link_speed: Speed of the link in Gb/s
114 * @link_width: Width of the link (1 or 2)
115 * @link_usb4: Upstream link is USB4
116 * @generation: Switch Thunderbolt generation
117 * @cap_plug_events: Offset to the plug events capability (%0 if not found)
118 * @cap_lc: Offset to the link controller capability (%0 if not found)
119 * @is_unplugged: The switch is going away
120 * @drom: DROM of the switch (%NULL if not found)
121 * @nvm: Pointer to the NVM if the switch has one (%NULL otherwise)
122 * @no_nvm_upgrade: Prevent NVM upgrade of this switch
123 * @safe_mode: The switch is in safe-mode
124 * @boot: Whether the switch was already authorized on boot or not
125 * @rpm: The switch supports runtime PM
126 * @authorized: Whether the switch is authorized by user or policy
127 * @security_level: Switch supported security level
128 * @debugfs_dir: Pointer to the debugfs structure
129 * @key: Contains the key used to challenge the device or %NULL if not
130 * supported. Size of the key is %TB_SWITCH_KEY_SIZE.
131 * @connection_id: Connection ID used with ICM messaging
132 * @connection_key: Connection key used with ICM messaging
133 * @link: Root switch link this switch is connected (ICM only)
134 * @depth: Depth in the chain this switch is connected (ICM only)
135 * @rpm_complete: Completion used to wait for runtime resume to
136 * complete (ICM only)
137 * @quirks: Quirks used for this Thunderbolt switch
138 *
139 * When the switch is being added or removed to the domain (other
140 * switches) you need to have domain lock held.
141 *
142 * In USB4 terminology this structure represents a router.
143 */
144 struct tb_switch {
145 struct device dev;
146 struct tb_regs_switch_header config;
147 struct tb_port *ports;
148 struct tb_dma_port *dma_port;
149 struct tb_switch_tmu tmu;
150 struct tb *tb;
151 u64 uid;
152 uuid_t *uuid;
153 u16 vendor;
154 u16 device;
155 const char *vendor_name;
156 const char *device_name;
157 unsigned int link_speed;
158 unsigned int link_width;
159 bool link_usb4;
160 unsigned int generation;
161 int cap_plug_events;
162 int cap_lc;
163 bool is_unplugged;
164 u8 *drom;
165 struct tb_nvm *nvm;
166 bool no_nvm_upgrade;
167 bool safe_mode;
168 bool boot;
169 bool rpm;
170 unsigned int authorized;
171 enum tb_security_level security_level;
172 struct dentry *debugfs_dir;
173 u8 *key;
174 u8 connection_id;
175 u8 connection_key;
176 u8 link;
177 u8 depth;
178 struct completion rpm_complete;
179 unsigned long quirks;
180 };
181
182 /**
183 * struct tb_port - a thunderbolt port, part of a tb_switch
184 * @config: Cached port configuration read from registers
185 * @sw: Switch the port belongs to
186 * @remote: Remote port (%NULL if not connected)
187 * @xdomain: Remote host (%NULL if not connected)
188 * @cap_phy: Offset, zero if not found
189 * @cap_tmu: Offset of the adapter specific TMU capability (%0 if not present)
190 * @cap_adap: Offset of the adapter specific capability (%0 if not present)
191 * @cap_usb4: Offset to the USB4 port capability (%0 if not present)
192 * @port: Port number on switch
193 * @disabled: Disabled by eeprom or enabled but not implemented
194 * @bonded: true if the port is bonded (two lanes combined as one)
195 * @dual_link_port: If the switch is connected using two ports, points
196 * to the other port.
197 * @link_nr: Is this primary or secondary port on the dual_link.
198 * @in_hopids: Currently allocated input HopIDs
199 * @out_hopids: Currently allocated output HopIDs
200 * @list: Used to link ports to DP resources list
201 *
202 * In USB4 terminology this structure represents an adapter (protocol or
203 * lane adapter).
204 */
205 struct tb_port {
206 struct tb_regs_port_header config;
207 struct tb_switch *sw;
208 struct tb_port *remote;
209 struct tb_xdomain *xdomain;
210 int cap_phy;
211 int cap_tmu;
212 int cap_adap;
213 int cap_usb4;
214 u8 port;
215 bool disabled;
216 bool bonded;
217 struct tb_port *dual_link_port;
218 u8 link_nr:1;
219 struct ida in_hopids;
220 struct ida out_hopids;
221 struct list_head list;
222 };
223
224 /**
225 * tb_retimer: Thunderbolt retimer
226 * @dev: Device for the retimer
227 * @tb: Pointer to the domain the retimer belongs to
228 * @index: Retimer index facing the router USB4 port
229 * @vendor: Vendor ID of the retimer
230 * @device: Device ID of the retimer
231 * @port: Pointer to the lane 0 adapter
232 * @nvm: Pointer to the NVM if the retimer has one (%NULL otherwise)
233 * @auth_status: Status of last NVM authentication
234 */
235 struct tb_retimer {
236 struct device dev;
237 struct tb *tb;
238 u8 index;
239 u32 vendor;
240 u32 device;
241 struct tb_port *port;
242 struct tb_nvm *nvm;
243 u32 auth_status;
244 };
245
246 /**
247 * struct tb_path_hop - routing information for a tb_path
248 * @in_port: Ingress port of a switch
249 * @out_port: Egress port of a switch where the packet is routed out
250 * (must be on the same switch than @in_port)
251 * @in_hop_index: HopID where the path configuration entry is placed in
252 * the path config space of @in_port.
253 * @in_counter_index: Used counter index (not used in the driver
254 * currently, %-1 to disable)
255 * @next_hop_index: HopID of the packet when it is routed out from @out_port
256 * @initial_credits: Number of initial flow control credits allocated for
257 * the path
258 *
259 * Hop configuration is always done on the IN port of a switch.
260 * in_port and out_port have to be on the same switch. Packets arriving on
261 * in_port with "hop" = in_hop_index will get routed to through out_port. The
262 * next hop to take (on out_port->remote) is determined by
263 * next_hop_index. When routing packet to another switch (out->remote is
264 * set) the @next_hop_index must match the @in_hop_index of that next
265 * hop to make routing possible.
266 *
267 * in_counter_index is the index of a counter (in TB_CFG_COUNTERS) on the in
268 * port.
269 */
270 struct tb_path_hop {
271 struct tb_port *in_port;
272 struct tb_port *out_port;
273 int in_hop_index;
274 int in_counter_index;
275 int next_hop_index;
276 unsigned int initial_credits;
277 };
278
279 /**
280 * enum tb_path_port - path options mask
281 * @TB_PATH_NONE: Do not activate on any hop on path
282 * @TB_PATH_SOURCE: Activate on the first hop (out of src)
283 * @TB_PATH_INTERNAL: Activate on the intermediate hops (not the first/last)
284 * @TB_PATH_DESTINATION: Activate on the last hop (into dst)
285 * @TB_PATH_ALL: Activate on all hops on the path
286 */
287 enum tb_path_port {
288 TB_PATH_NONE = 0,
289 TB_PATH_SOURCE = 1,
290 TB_PATH_INTERNAL = 2,
291 TB_PATH_DESTINATION = 4,
292 TB_PATH_ALL = 7,
293 };
294
295 /**
296 * struct tb_path - a unidirectional path between two ports
297 * @tb: Pointer to the domain structure
298 * @name: Name of the path (used for debugging)
299 * @nfc_credits: Number of non flow controlled credits allocated for the path
300 * @ingress_shared_buffer: Shared buffering used for ingress ports on the path
301 * @egress_shared_buffer: Shared buffering used for egress ports on the path
302 * @ingress_fc_enable: Flow control for ingress ports on the path
303 * @egress_fc_enable: Flow control for egress ports on the path
304 * @priority: Priority group if the path
305 * @weight: Weight of the path inside the priority group
306 * @drop_packages: Drop packages from queue tail or head
307 * @activated: Is the path active
308 * @clear_fc: Clear all flow control from the path config space entries
309 * when deactivating this path
310 * @hops: Path hops
311 * @path_length: How many hops the path uses
312 *
313 * A path consists of a number of hops (see &struct tb_path_hop). To
314 * establish a PCIe tunnel two paths have to be created between the two
315 * PCIe ports.
316 */
317 struct tb_path {
318 struct tb *tb;
319 const char *name;
320 int nfc_credits;
321 enum tb_path_port ingress_shared_buffer;
322 enum tb_path_port egress_shared_buffer;
323 enum tb_path_port ingress_fc_enable;
324 enum tb_path_port egress_fc_enable;
325
326 unsigned int priority:3;
327 int weight:4;
328 bool drop_packages;
329 bool activated;
330 bool clear_fc;
331 struct tb_path_hop *hops;
332 int path_length;
333 };
334
335 /* HopIDs 0-7 are reserved by the Thunderbolt protocol */
336 #define TB_PATH_MIN_HOPID 8
337 /*
338 * Support paths from the farthest (depth 6) router to the host and back
339 * to the same level (not necessarily to the same router).
340 */
341 #define TB_PATH_MAX_HOPS (7 * 2)
342
343 /* Possible wake types */
344 #define TB_WAKE_ON_CONNECT BIT(0)
345 #define TB_WAKE_ON_DISCONNECT BIT(1)
346 #define TB_WAKE_ON_USB4 BIT(2)
347 #define TB_WAKE_ON_USB3 BIT(3)
348 #define TB_WAKE_ON_PCIE BIT(4)
349
350 /**
351 * struct tb_cm_ops - Connection manager specific operations vector
352 * @driver_ready: Called right after control channel is started. Used by
353 * ICM to send driver ready message to the firmware.
354 * @start: Starts the domain
355 * @stop: Stops the domain
356 * @suspend_noirq: Connection manager specific suspend_noirq
357 * @resume_noirq: Connection manager specific resume_noirq
358 * @suspend: Connection manager specific suspend
359 * @freeze_noirq: Connection manager specific freeze_noirq
360 * @thaw_noirq: Connection manager specific thaw_noirq
361 * @complete: Connection manager specific complete
362 * @runtime_suspend: Connection manager specific runtime_suspend
363 * @runtime_resume: Connection manager specific runtime_resume
364 * @runtime_suspend_switch: Runtime suspend a switch
365 * @runtime_resume_switch: Runtime resume a switch
366 * @handle_event: Handle thunderbolt event
367 * @get_boot_acl: Get boot ACL list
368 * @set_boot_acl: Set boot ACL list
369 * @disapprove_switch: Disapprove switch (disconnect PCIe tunnel)
370 * @approve_switch: Approve switch
371 * @add_switch_key: Add key to switch
372 * @challenge_switch_key: Challenge switch using key
373 * @disconnect_pcie_paths: Disconnects PCIe paths before NVM update
374 * @approve_xdomain_paths: Approve (establish) XDomain DMA paths
375 * @disconnect_xdomain_paths: Disconnect XDomain DMA paths
376 * @usb4_switch_op: Optional proxy for USB4 router operations. If set
377 * this will be called whenever USB4 router operation is
378 * performed. If this returns %-EOPNOTSUPP then the
379 * native USB4 router operation is called.
380 * @usb4_switch_nvm_authenticate_status: Optional callback that the CM
381 * implementation can be used to
382 * return status of USB4 NVM_AUTH
383 * router operation.
384 */
385 struct tb_cm_ops {
386 int (*driver_ready)(struct tb *tb);
387 int (*start)(struct tb *tb);
388 void (*stop)(struct tb *tb);
389 int (*suspend_noirq)(struct tb *tb);
390 int (*resume_noirq)(struct tb *tb);
391 int (*suspend)(struct tb *tb);
392 int (*freeze_noirq)(struct tb *tb);
393 int (*thaw_noirq)(struct tb *tb);
394 void (*complete)(struct tb *tb);
395 int (*runtime_suspend)(struct tb *tb);
396 int (*runtime_resume)(struct tb *tb);
397 int (*runtime_suspend_switch)(struct tb_switch *sw);
398 int (*runtime_resume_switch)(struct tb_switch *sw);
399 void (*handle_event)(struct tb *tb, enum tb_cfg_pkg_type,
400 const void *buf, size_t size);
401 int (*get_boot_acl)(struct tb *tb, uuid_t *uuids, size_t nuuids);
402 int (*set_boot_acl)(struct tb *tb, const uuid_t *uuids, size_t nuuids);
403 int (*disapprove_switch)(struct tb *tb, struct tb_switch *sw);
404 int (*approve_switch)(struct tb *tb, struct tb_switch *sw);
405 int (*add_switch_key)(struct tb *tb, struct tb_switch *sw);
406 int (*challenge_switch_key)(struct tb *tb, struct tb_switch *sw,
407 const u8 *challenge, u8 *response);
408 int (*disconnect_pcie_paths)(struct tb *tb);
409 int (*approve_xdomain_paths)(struct tb *tb, struct tb_xdomain *xd,
410 int transmit_path, int transmit_ring,
411 int receive_path, int receive_ring);
412 int (*disconnect_xdomain_paths)(struct tb *tb, struct tb_xdomain *xd,
413 int transmit_path, int transmit_ring,
414 int receive_path, int receive_ring);
415 int (*usb4_switch_op)(struct tb_switch *sw, u16 opcode, u32 *metadata,
416 u8 *status, const void *tx_data, size_t tx_data_len,
417 void *rx_data, size_t rx_data_len);
418 int (*usb4_switch_nvm_authenticate_status)(struct tb_switch *sw,
419 u32 *status);
420 };
421
tb_priv(struct tb * tb)422 static inline void *tb_priv(struct tb *tb)
423 {
424 return (void *)tb->privdata;
425 }
426
427 #define TB_AUTOSUSPEND_DELAY 15000 /* ms */
428
429 /* helper functions & macros */
430
431 /**
432 * tb_upstream_port() - return the upstream port of a switch
433 *
434 * Every switch has an upstream port (for the root switch it is the NHI).
435 *
436 * During switch alloc/init tb_upstream_port()->remote may be NULL, even for
437 * non root switches (on the NHI port remote is always NULL).
438 *
439 * Return: Returns the upstream port of the switch.
440 */
tb_upstream_port(struct tb_switch * sw)441 static inline struct tb_port *tb_upstream_port(struct tb_switch *sw)
442 {
443 return &sw->ports[sw->config.upstream_port_number];
444 }
445
446 /**
447 * tb_is_upstream_port() - Is the port upstream facing
448 * @port: Port to check
449 *
450 * Returns true if @port is upstream facing port. In case of dual link
451 * ports both return true.
452 */
tb_is_upstream_port(const struct tb_port * port)453 static inline bool tb_is_upstream_port(const struct tb_port *port)
454 {
455 const struct tb_port *upstream_port = tb_upstream_port(port->sw);
456 return port == upstream_port || port->dual_link_port == upstream_port;
457 }
458
tb_route(const struct tb_switch * sw)459 static inline u64 tb_route(const struct tb_switch *sw)
460 {
461 return ((u64) sw->config.route_hi) << 32 | sw->config.route_lo;
462 }
463
tb_port_at(u64 route,struct tb_switch * sw)464 static inline struct tb_port *tb_port_at(u64 route, struct tb_switch *sw)
465 {
466 u8 port;
467
468 port = route >> (sw->config.depth * 8);
469 if (WARN_ON(port > sw->config.max_port_number))
470 return NULL;
471 return &sw->ports[port];
472 }
473
474 /**
475 * tb_port_has_remote() - Does the port have switch connected downstream
476 * @port: Port to check
477 *
478 * Returns true only when the port is primary port and has remote set.
479 */
tb_port_has_remote(const struct tb_port * port)480 static inline bool tb_port_has_remote(const struct tb_port *port)
481 {
482 if (tb_is_upstream_port(port))
483 return false;
484 if (!port->remote)
485 return false;
486 if (port->dual_link_port && port->link_nr)
487 return false;
488
489 return true;
490 }
491
tb_port_is_null(const struct tb_port * port)492 static inline bool tb_port_is_null(const struct tb_port *port)
493 {
494 return port && port->port && port->config.type == TB_TYPE_PORT;
495 }
496
tb_port_is_nhi(const struct tb_port * port)497 static inline bool tb_port_is_nhi(const struct tb_port *port)
498 {
499 return port && port->config.type == TB_TYPE_NHI;
500 }
501
tb_port_is_pcie_down(const struct tb_port * port)502 static inline bool tb_port_is_pcie_down(const struct tb_port *port)
503 {
504 return port && port->config.type == TB_TYPE_PCIE_DOWN;
505 }
506
tb_port_is_pcie_up(const struct tb_port * port)507 static inline bool tb_port_is_pcie_up(const struct tb_port *port)
508 {
509 return port && port->config.type == TB_TYPE_PCIE_UP;
510 }
511
tb_port_is_dpin(const struct tb_port * port)512 static inline bool tb_port_is_dpin(const struct tb_port *port)
513 {
514 return port && port->config.type == TB_TYPE_DP_HDMI_IN;
515 }
516
tb_port_is_dpout(const struct tb_port * port)517 static inline bool tb_port_is_dpout(const struct tb_port *port)
518 {
519 return port && port->config.type == TB_TYPE_DP_HDMI_OUT;
520 }
521
tb_port_is_usb3_down(const struct tb_port * port)522 static inline bool tb_port_is_usb3_down(const struct tb_port *port)
523 {
524 return port && port->config.type == TB_TYPE_USB3_DOWN;
525 }
526
tb_port_is_usb3_up(const struct tb_port * port)527 static inline bool tb_port_is_usb3_up(const struct tb_port *port)
528 {
529 return port && port->config.type == TB_TYPE_USB3_UP;
530 }
531
tb_sw_read(struct tb_switch * sw,void * buffer,enum tb_cfg_space space,u32 offset,u32 length)532 static inline int tb_sw_read(struct tb_switch *sw, void *buffer,
533 enum tb_cfg_space space, u32 offset, u32 length)
534 {
535 if (sw->is_unplugged)
536 return -ENODEV;
537 return tb_cfg_read(sw->tb->ctl,
538 buffer,
539 tb_route(sw),
540 0,
541 space,
542 offset,
543 length);
544 }
545
tb_sw_write(struct tb_switch * sw,const void * buffer,enum tb_cfg_space space,u32 offset,u32 length)546 static inline int tb_sw_write(struct tb_switch *sw, const void *buffer,
547 enum tb_cfg_space space, u32 offset, u32 length)
548 {
549 if (sw->is_unplugged)
550 return -ENODEV;
551 return tb_cfg_write(sw->tb->ctl,
552 buffer,
553 tb_route(sw),
554 0,
555 space,
556 offset,
557 length);
558 }
559
tb_port_read(struct tb_port * port,void * buffer,enum tb_cfg_space space,u32 offset,u32 length)560 static inline int tb_port_read(struct tb_port *port, void *buffer,
561 enum tb_cfg_space space, u32 offset, u32 length)
562 {
563 if (port->sw->is_unplugged)
564 return -ENODEV;
565 return tb_cfg_read(port->sw->tb->ctl,
566 buffer,
567 tb_route(port->sw),
568 port->port,
569 space,
570 offset,
571 length);
572 }
573
tb_port_write(struct tb_port * port,const void * buffer,enum tb_cfg_space space,u32 offset,u32 length)574 static inline int tb_port_write(struct tb_port *port, const void *buffer,
575 enum tb_cfg_space space, u32 offset, u32 length)
576 {
577 if (port->sw->is_unplugged)
578 return -ENODEV;
579 return tb_cfg_write(port->sw->tb->ctl,
580 buffer,
581 tb_route(port->sw),
582 port->port,
583 space,
584 offset,
585 length);
586 }
587
588 #define tb_err(tb, fmt, arg...) dev_err(&(tb)->nhi->pdev->dev, fmt, ## arg)
589 #define tb_WARN(tb, fmt, arg...) dev_WARN(&(tb)->nhi->pdev->dev, fmt, ## arg)
590 #define tb_warn(tb, fmt, arg...) dev_warn(&(tb)->nhi->pdev->dev, fmt, ## arg)
591 #define tb_info(tb, fmt, arg...) dev_info(&(tb)->nhi->pdev->dev, fmt, ## arg)
592 #define tb_dbg(tb, fmt, arg...) dev_dbg(&(tb)->nhi->pdev->dev, fmt, ## arg)
593
594 #define __TB_SW_PRINT(level, sw, fmt, arg...) \
595 do { \
596 const struct tb_switch *__sw = (sw); \
597 level(__sw->tb, "%llx: " fmt, \
598 tb_route(__sw), ## arg); \
599 } while (0)
600 #define tb_sw_WARN(sw, fmt, arg...) __TB_SW_PRINT(tb_WARN, sw, fmt, ##arg)
601 #define tb_sw_warn(sw, fmt, arg...) __TB_SW_PRINT(tb_warn, sw, fmt, ##arg)
602 #define tb_sw_info(sw, fmt, arg...) __TB_SW_PRINT(tb_info, sw, fmt, ##arg)
603 #define tb_sw_dbg(sw, fmt, arg...) __TB_SW_PRINT(tb_dbg, sw, fmt, ##arg)
604
605 #define __TB_PORT_PRINT(level, _port, fmt, arg...) \
606 do { \
607 const struct tb_port *__port = (_port); \
608 level(__port->sw->tb, "%llx:%x: " fmt, \
609 tb_route(__port->sw), __port->port, ## arg); \
610 } while (0)
611 #define tb_port_WARN(port, fmt, arg...) \
612 __TB_PORT_PRINT(tb_WARN, port, fmt, ##arg)
613 #define tb_port_warn(port, fmt, arg...) \
614 __TB_PORT_PRINT(tb_warn, port, fmt, ##arg)
615 #define tb_port_info(port, fmt, arg...) \
616 __TB_PORT_PRINT(tb_info, port, fmt, ##arg)
617 #define tb_port_dbg(port, fmt, arg...) \
618 __TB_PORT_PRINT(tb_dbg, port, fmt, ##arg)
619
620 struct tb *icm_probe(struct tb_nhi *nhi);
621 struct tb *tb_probe(struct tb_nhi *nhi);
622
623 extern struct device_type tb_domain_type;
624 extern struct device_type tb_retimer_type;
625 extern struct device_type tb_switch_type;
626
627 int tb_domain_init(void);
628 void tb_domain_exit(void);
629 int tb_xdomain_init(void);
630 void tb_xdomain_exit(void);
631
632 struct tb *tb_domain_alloc(struct tb_nhi *nhi, int timeout_msec, size_t privsize);
633 int tb_domain_add(struct tb *tb);
634 void tb_domain_remove(struct tb *tb);
635 int tb_domain_suspend_noirq(struct tb *tb);
636 int tb_domain_resume_noirq(struct tb *tb);
637 int tb_domain_suspend(struct tb *tb);
638 int tb_domain_freeze_noirq(struct tb *tb);
639 int tb_domain_thaw_noirq(struct tb *tb);
640 void tb_domain_complete(struct tb *tb);
641 int tb_domain_runtime_suspend(struct tb *tb);
642 int tb_domain_runtime_resume(struct tb *tb);
643 int tb_domain_disapprove_switch(struct tb *tb, struct tb_switch *sw);
644 int tb_domain_approve_switch(struct tb *tb, struct tb_switch *sw);
645 int tb_domain_approve_switch_key(struct tb *tb, struct tb_switch *sw);
646 int tb_domain_challenge_switch_key(struct tb *tb, struct tb_switch *sw);
647 int tb_domain_disconnect_pcie_paths(struct tb *tb);
648 int tb_domain_approve_xdomain_paths(struct tb *tb, struct tb_xdomain *xd,
649 int transmit_path, int transmit_ring,
650 int receive_path, int receive_ring);
651 int tb_domain_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd,
652 int transmit_path, int transmit_ring,
653 int receive_path, int receive_ring);
654 int tb_domain_disconnect_all_paths(struct tb *tb);
655
tb_domain_get(struct tb * tb)656 static inline struct tb *tb_domain_get(struct tb *tb)
657 {
658 if (tb)
659 get_device(&tb->dev);
660 return tb;
661 }
662
tb_domain_put(struct tb * tb)663 static inline void tb_domain_put(struct tb *tb)
664 {
665 put_device(&tb->dev);
666 }
667
668 struct tb_nvm *tb_nvm_alloc(struct device *dev);
669 int tb_nvm_add_active(struct tb_nvm *nvm, size_t size, nvmem_reg_read_t reg_read);
670 int tb_nvm_write_buf(struct tb_nvm *nvm, unsigned int offset, void *val,
671 size_t bytes);
672 int tb_nvm_add_non_active(struct tb_nvm *nvm, size_t size,
673 nvmem_reg_write_t reg_write);
674 void tb_nvm_free(struct tb_nvm *nvm);
675 void tb_nvm_exit(void);
676
677 struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,
678 u64 route);
679 struct tb_switch *tb_switch_alloc_safe_mode(struct tb *tb,
680 struct device *parent, u64 route);
681 int tb_switch_configure(struct tb_switch *sw);
682 int tb_switch_add(struct tb_switch *sw);
683 void tb_switch_remove(struct tb_switch *sw);
684 void tb_switch_suspend(struct tb_switch *sw, bool runtime);
685 int tb_switch_resume(struct tb_switch *sw);
686 int tb_switch_reset(struct tb_switch *sw);
687 void tb_sw_set_unplugged(struct tb_switch *sw);
688 struct tb_port *tb_switch_find_port(struct tb_switch *sw,
689 enum tb_port_type type);
690 struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link,
691 u8 depth);
692 struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_t *uuid);
693 struct tb_switch *tb_switch_find_by_route(struct tb *tb, u64 route);
694
695 /**
696 * tb_switch_for_each_port() - Iterate over each switch port
697 * @sw: Switch whose ports to iterate
698 * @p: Port used as iterator
699 *
700 * Iterates over each switch port skipping the control port (port %0).
701 */
702 #define tb_switch_for_each_port(sw, p) \
703 for ((p) = &(sw)->ports[1]; \
704 (p) <= &(sw)->ports[(sw)->config.max_port_number]; (p)++)
705
tb_switch_get(struct tb_switch * sw)706 static inline struct tb_switch *tb_switch_get(struct tb_switch *sw)
707 {
708 if (sw)
709 get_device(&sw->dev);
710 return sw;
711 }
712
tb_switch_put(struct tb_switch * sw)713 static inline void tb_switch_put(struct tb_switch *sw)
714 {
715 put_device(&sw->dev);
716 }
717
tb_is_switch(const struct device * dev)718 static inline bool tb_is_switch(const struct device *dev)
719 {
720 return dev->type == &tb_switch_type;
721 }
722
tb_to_switch(struct device * dev)723 static inline struct tb_switch *tb_to_switch(struct device *dev)
724 {
725 if (tb_is_switch(dev))
726 return container_of(dev, struct tb_switch, dev);
727 return NULL;
728 }
729
tb_switch_parent(struct tb_switch * sw)730 static inline struct tb_switch *tb_switch_parent(struct tb_switch *sw)
731 {
732 return tb_to_switch(sw->dev.parent);
733 }
734
tb_switch_is_light_ridge(const struct tb_switch * sw)735 static inline bool tb_switch_is_light_ridge(const struct tb_switch *sw)
736 {
737 return sw->config.vendor_id == PCI_VENDOR_ID_INTEL &&
738 sw->config.device_id == PCI_DEVICE_ID_INTEL_LIGHT_RIDGE;
739 }
740
tb_switch_is_eagle_ridge(const struct tb_switch * sw)741 static inline bool tb_switch_is_eagle_ridge(const struct tb_switch *sw)
742 {
743 return sw->config.vendor_id == PCI_VENDOR_ID_INTEL &&
744 sw->config.device_id == PCI_DEVICE_ID_INTEL_EAGLE_RIDGE;
745 }
746
tb_switch_is_cactus_ridge(const struct tb_switch * sw)747 static inline bool tb_switch_is_cactus_ridge(const struct tb_switch *sw)
748 {
749 if (sw->config.vendor_id == PCI_VENDOR_ID_INTEL) {
750 switch (sw->config.device_id) {
751 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_2C:
752 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C:
753 return true;
754 }
755 }
756 return false;
757 }
758
tb_switch_is_falcon_ridge(const struct tb_switch * sw)759 static inline bool tb_switch_is_falcon_ridge(const struct tb_switch *sw)
760 {
761 if (sw->config.vendor_id == PCI_VENDOR_ID_INTEL) {
762 switch (sw->config.device_id) {
763 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE:
764 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE:
765 return true;
766 }
767 }
768 return false;
769 }
770
tb_switch_is_alpine_ridge(const struct tb_switch * sw)771 static inline bool tb_switch_is_alpine_ridge(const struct tb_switch *sw)
772 {
773 if (sw->config.vendor_id == PCI_VENDOR_ID_INTEL) {
774 switch (sw->config.device_id) {
775 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_BRIDGE:
776 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE:
777 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE:
778 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE:
779 return true;
780 }
781 }
782 return false;
783 }
784
tb_switch_is_titan_ridge(const struct tb_switch * sw)785 static inline bool tb_switch_is_titan_ridge(const struct tb_switch *sw)
786 {
787 if (sw->config.vendor_id == PCI_VENDOR_ID_INTEL) {
788 switch (sw->config.device_id) {
789 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_BRIDGE:
790 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_BRIDGE:
791 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_BRIDGE:
792 return true;
793 }
794 }
795 return false;
796 }
797
798 /**
799 * tb_switch_is_usb4() - Is the switch USB4 compliant
800 * @sw: Switch to check
801 *
802 * Returns true if the @sw is USB4 compliant router, false otherwise.
803 */
tb_switch_is_usb4(const struct tb_switch * sw)804 static inline bool tb_switch_is_usb4(const struct tb_switch *sw)
805 {
806 return sw->config.thunderbolt_version == USB4_VERSION_1_0;
807 }
808
809 /**
810 * tb_switch_is_icm() - Is the switch handled by ICM firmware
811 * @sw: Switch to check
812 *
813 * In case there is a need to differentiate whether ICM firmware or SW CM
814 * is handling @sw this function can be called. It is valid to call this
815 * after tb_switch_alloc() and tb_switch_configure() has been called
816 * (latter only for SW CM case).
817 */
tb_switch_is_icm(const struct tb_switch * sw)818 static inline bool tb_switch_is_icm(const struct tb_switch *sw)
819 {
820 return !sw->config.enabled;
821 }
822
823 int tb_switch_lane_bonding_enable(struct tb_switch *sw);
824 void tb_switch_lane_bonding_disable(struct tb_switch *sw);
825 int tb_switch_configure_link(struct tb_switch *sw);
826 void tb_switch_unconfigure_link(struct tb_switch *sw);
827
828 bool tb_switch_query_dp_resource(struct tb_switch *sw, struct tb_port *in);
829 int tb_switch_alloc_dp_resource(struct tb_switch *sw, struct tb_port *in);
830 void tb_switch_dealloc_dp_resource(struct tb_switch *sw, struct tb_port *in);
831
832 int tb_switch_tmu_init(struct tb_switch *sw);
833 int tb_switch_tmu_post_time(struct tb_switch *sw);
834 int tb_switch_tmu_disable(struct tb_switch *sw);
835 int tb_switch_tmu_enable(struct tb_switch *sw);
836
tb_switch_tmu_is_enabled(const struct tb_switch * sw)837 static inline bool tb_switch_tmu_is_enabled(const struct tb_switch *sw)
838 {
839 return sw->tmu.rate == TB_SWITCH_TMU_RATE_HIFI &&
840 !sw->tmu.unidirectional;
841 }
842
843 int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged);
844 int tb_port_add_nfc_credits(struct tb_port *port, int credits);
845 int tb_port_clear_counter(struct tb_port *port, int counter);
846 int tb_port_unlock(struct tb_port *port);
847 int tb_port_enable(struct tb_port *port);
848 int tb_port_disable(struct tb_port *port);
849 int tb_port_alloc_in_hopid(struct tb_port *port, int hopid, int max_hopid);
850 void tb_port_release_in_hopid(struct tb_port *port, int hopid);
851 int tb_port_alloc_out_hopid(struct tb_port *port, int hopid, int max_hopid);
852 void tb_port_release_out_hopid(struct tb_port *port, int hopid);
853 struct tb_port *tb_next_port_on_path(struct tb_port *start, struct tb_port *end,
854 struct tb_port *prev);
855
856 /**
857 * tb_for_each_port_on_path() - Iterate over each port on path
858 * @src: Source port
859 * @dst: Destination port
860 * @p: Port used as iterator
861 *
862 * Walks over each port on path from @src to @dst.
863 */
864 #define tb_for_each_port_on_path(src, dst, p) \
865 for ((p) = tb_next_port_on_path((src), (dst), NULL); (p); \
866 (p) = tb_next_port_on_path((src), (dst), (p)))
867
868 int tb_port_get_link_speed(struct tb_port *port);
869 int tb_port_get_link_width(struct tb_port *port);
870 int tb_port_state(struct tb_port *port);
871 int tb_port_lane_bonding_enable(struct tb_port *port);
872 void tb_port_lane_bonding_disable(struct tb_port *port);
873
874 int tb_switch_find_vse_cap(struct tb_switch *sw, enum tb_switch_vse_cap vsec);
875 int tb_switch_find_cap(struct tb_switch *sw, enum tb_switch_cap cap);
876 int tb_switch_next_cap(struct tb_switch *sw, unsigned int offset);
877 int tb_port_find_cap(struct tb_port *port, enum tb_port_cap cap);
878 int tb_port_next_cap(struct tb_port *port, unsigned int offset);
879 bool tb_port_is_enabled(struct tb_port *port);
880
881 bool tb_usb3_port_is_enabled(struct tb_port *port);
882 int tb_usb3_port_enable(struct tb_port *port, bool enable);
883
884 bool tb_pci_port_is_enabled(struct tb_port *port);
885 int tb_pci_port_enable(struct tb_port *port, bool enable);
886
887 int tb_dp_port_hpd_is_active(struct tb_port *port);
888 int tb_dp_port_hpd_clear(struct tb_port *port);
889 int tb_dp_port_set_hops(struct tb_port *port, unsigned int video,
890 unsigned int aux_tx, unsigned int aux_rx);
891 bool tb_dp_port_is_enabled(struct tb_port *port);
892 int tb_dp_port_enable(struct tb_port *port, bool enable);
893
894 struct tb_path *tb_path_discover(struct tb_port *src, int src_hopid,
895 struct tb_port *dst, int dst_hopid,
896 struct tb_port **last, const char *name);
897 struct tb_path *tb_path_alloc(struct tb *tb, struct tb_port *src, int src_hopid,
898 struct tb_port *dst, int dst_hopid, int link_nr,
899 const char *name);
900 void tb_path_free(struct tb_path *path);
901 int tb_path_activate(struct tb_path *path);
902 void tb_path_deactivate(struct tb_path *path);
903 bool tb_path_is_invalid(struct tb_path *path);
904 bool tb_path_port_on_path(const struct tb_path *path,
905 const struct tb_port *port);
906
907 int tb_drom_read(struct tb_switch *sw);
908 int tb_drom_read_uid_only(struct tb_switch *sw, u64 *uid);
909
910 int tb_lc_read_uuid(struct tb_switch *sw, u32 *uuid);
911 int tb_lc_configure_port(struct tb_port *port);
912 void tb_lc_unconfigure_port(struct tb_port *port);
913 int tb_lc_configure_xdomain(struct tb_port *port);
914 void tb_lc_unconfigure_xdomain(struct tb_port *port);
915 int tb_lc_start_lane_initialization(struct tb_port *port);
916 int tb_lc_set_wake(struct tb_switch *sw, unsigned int flags);
917 int tb_lc_set_sleep(struct tb_switch *sw);
918 bool tb_lc_lane_bonding_possible(struct tb_switch *sw);
919 bool tb_lc_dp_sink_query(struct tb_switch *sw, struct tb_port *in);
920 int tb_lc_dp_sink_alloc(struct tb_switch *sw, struct tb_port *in);
921 int tb_lc_dp_sink_dealloc(struct tb_switch *sw, struct tb_port *in);
922 int tb_lc_force_power(struct tb_switch *sw);
923
tb_route_length(u64 route)924 static inline int tb_route_length(u64 route)
925 {
926 return (fls64(route) + TB_ROUTE_SHIFT - 1) / TB_ROUTE_SHIFT;
927 }
928
929 /**
930 * tb_downstream_route() - get route to downstream switch
931 *
932 * Port must not be the upstream port (otherwise a loop is created).
933 *
934 * Return: Returns a route to the switch behind @port.
935 */
tb_downstream_route(struct tb_port * port)936 static inline u64 tb_downstream_route(struct tb_port *port)
937 {
938 return tb_route(port->sw)
939 | ((u64) port->port << (port->sw->config.depth * 8));
940 }
941
942 bool tb_is_xdomain_enabled(void);
943 bool tb_xdomain_handle_request(struct tb *tb, enum tb_cfg_pkg_type type,
944 const void *buf, size_t size);
945 struct tb_xdomain *tb_xdomain_alloc(struct tb *tb, struct device *parent,
946 u64 route, const uuid_t *local_uuid,
947 const uuid_t *remote_uuid);
948 void tb_xdomain_add(struct tb_xdomain *xd);
949 void tb_xdomain_remove(struct tb_xdomain *xd);
950 struct tb_xdomain *tb_xdomain_find_by_link_depth(struct tb *tb, u8 link,
951 u8 depth);
952
953 int tb_retimer_scan(struct tb_port *port);
954 void tb_retimer_remove_all(struct tb_port *port);
955
tb_is_retimer(const struct device * dev)956 static inline bool tb_is_retimer(const struct device *dev)
957 {
958 return dev->type == &tb_retimer_type;
959 }
960
tb_to_retimer(struct device * dev)961 static inline struct tb_retimer *tb_to_retimer(struct device *dev)
962 {
963 if (tb_is_retimer(dev))
964 return container_of(dev, struct tb_retimer, dev);
965 return NULL;
966 }
967
968 int usb4_switch_setup(struct tb_switch *sw);
969 int usb4_switch_read_uid(struct tb_switch *sw, u64 *uid);
970 int usb4_switch_drom_read(struct tb_switch *sw, unsigned int address, void *buf,
971 size_t size);
972 bool usb4_switch_lane_bonding_possible(struct tb_switch *sw);
973 int usb4_switch_set_wake(struct tb_switch *sw, unsigned int flags);
974 int usb4_switch_set_sleep(struct tb_switch *sw);
975 int usb4_switch_nvm_sector_size(struct tb_switch *sw);
976 int usb4_switch_nvm_read(struct tb_switch *sw, unsigned int address, void *buf,
977 size_t size);
978 int usb4_switch_nvm_write(struct tb_switch *sw, unsigned int address,
979 const void *buf, size_t size);
980 int usb4_switch_nvm_authenticate(struct tb_switch *sw);
981 int usb4_switch_nvm_authenticate_status(struct tb_switch *sw, u32 *status);
982 bool usb4_switch_query_dp_resource(struct tb_switch *sw, struct tb_port *in);
983 int usb4_switch_alloc_dp_resource(struct tb_switch *sw, struct tb_port *in);
984 int usb4_switch_dealloc_dp_resource(struct tb_switch *sw, struct tb_port *in);
985 struct tb_port *usb4_switch_map_pcie_down(struct tb_switch *sw,
986 const struct tb_port *port);
987 struct tb_port *usb4_switch_map_usb3_down(struct tb_switch *sw,
988 const struct tb_port *port);
989
990 int usb4_port_unlock(struct tb_port *port);
991 int usb4_port_configure(struct tb_port *port);
992 void usb4_port_unconfigure(struct tb_port *port);
993 int usb4_port_configure_xdomain(struct tb_port *port);
994 void usb4_port_unconfigure_xdomain(struct tb_port *port);
995 int usb4_port_enumerate_retimers(struct tb_port *port);
996
997 int usb4_port_retimer_read(struct tb_port *port, u8 index, u8 reg, void *buf,
998 u8 size);
999 int usb4_port_retimer_write(struct tb_port *port, u8 index, u8 reg,
1000 const void *buf, u8 size);
1001 int usb4_port_retimer_is_last(struct tb_port *port, u8 index);
1002 int usb4_port_retimer_nvm_sector_size(struct tb_port *port, u8 index);
1003 int usb4_port_retimer_nvm_write(struct tb_port *port, u8 index,
1004 unsigned int address, const void *buf,
1005 size_t size);
1006 int usb4_port_retimer_nvm_authenticate(struct tb_port *port, u8 index);
1007 int usb4_port_retimer_nvm_authenticate_status(struct tb_port *port, u8 index,
1008 u32 *status);
1009 int usb4_port_retimer_nvm_read(struct tb_port *port, u8 index,
1010 unsigned int address, void *buf, size_t size);
1011
1012 int usb4_usb3_port_max_link_rate(struct tb_port *port);
1013 int usb4_usb3_port_actual_link_rate(struct tb_port *port);
1014 int usb4_usb3_port_allocated_bandwidth(struct tb_port *port, int *upstream_bw,
1015 int *downstream_bw);
1016 int usb4_usb3_port_allocate_bandwidth(struct tb_port *port, int *upstream_bw,
1017 int *downstream_bw);
1018 int usb4_usb3_port_release_bandwidth(struct tb_port *port, int *upstream_bw,
1019 int *downstream_bw);
1020
1021 /* Keep link controller awake during update */
1022 #define QUIRK_FORCE_POWER_LINK_CONTROLLER BIT(0)
1023
1024 void tb_check_quirks(struct tb_switch *sw);
1025
1026 #ifdef CONFIG_ACPI
1027 void tb_acpi_add_links(struct tb_nhi *nhi);
1028
1029 bool tb_acpi_is_native(void);
1030 bool tb_acpi_may_tunnel_usb3(void);
1031 bool tb_acpi_may_tunnel_dp(void);
1032 bool tb_acpi_may_tunnel_pcie(void);
1033 bool tb_acpi_is_xdomain_allowed(void);
1034 #else
tb_acpi_add_links(struct tb_nhi * nhi)1035 static inline void tb_acpi_add_links(struct tb_nhi *nhi) { }
1036
tb_acpi_is_native(void)1037 static inline bool tb_acpi_is_native(void) { return true; }
tb_acpi_may_tunnel_usb3(void)1038 static inline bool tb_acpi_may_tunnel_usb3(void) { return true; }
tb_acpi_may_tunnel_dp(void)1039 static inline bool tb_acpi_may_tunnel_dp(void) { return true; }
tb_acpi_may_tunnel_pcie(void)1040 static inline bool tb_acpi_may_tunnel_pcie(void) { return true; }
tb_acpi_is_xdomain_allowed(void)1041 static inline bool tb_acpi_is_xdomain_allowed(void) { return true; }
1042 #endif
1043
1044 #ifdef CONFIG_DEBUG_FS
1045 void tb_debugfs_init(void);
1046 void tb_debugfs_exit(void);
1047 void tb_switch_debugfs_init(struct tb_switch *sw);
1048 void tb_switch_debugfs_remove(struct tb_switch *sw);
1049 void tb_service_debugfs_init(struct tb_service *svc);
1050 void tb_service_debugfs_remove(struct tb_service *svc);
1051 #else
tb_debugfs_init(void)1052 static inline void tb_debugfs_init(void) { }
tb_debugfs_exit(void)1053 static inline void tb_debugfs_exit(void) { }
tb_switch_debugfs_init(struct tb_switch * sw)1054 static inline void tb_switch_debugfs_init(struct tb_switch *sw) { }
tb_switch_debugfs_remove(struct tb_switch * sw)1055 static inline void tb_switch_debugfs_remove(struct tb_switch *sw) { }
tb_service_debugfs_init(struct tb_service * svc)1056 static inline void tb_service_debugfs_init(struct tb_service *svc) { }
tb_service_debugfs_remove(struct tb_service * svc)1057 static inline void tb_service_debugfs_remove(struct tb_service *svc) { }
1058 #endif
1059
1060 #ifdef CONFIG_USB4_KUNIT_TEST
1061 int tb_test_init(void);
1062 void tb_test_exit(void);
1063 #else
tb_test_init(void)1064 static inline int tb_test_init(void) { return 0; }
tb_test_exit(void)1065 static inline void tb_test_exit(void) { }
1066 #endif
1067
1068 #endif
1069