1 // SPDX-License-Identifier: GPL-2.0
3 * Thunderbolt driver - switch/port utility functions
5 * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
6 * Copyright (C) 2018, Intel Corporation
9 #include <linux/delay.h>
10 #include <linux/idr.h>
11 #include <linux/nvmem-provider.h>
12 #include <linux/pm_runtime.h>
13 #include <linux/sched/signal.h>
14 #include <linux/sizes.h>
15 #include <linux/slab.h>
19 /* Switch NVM support */
23 struct nvm_auth_status
{
24 struct list_head list
;
30 WRITE_AND_AUTHENTICATE
= 1,
35 * Hold NVM authentication failure status per switch This information
36 * needs to stay around even when the switch gets power cycled so we
39 static LIST_HEAD(nvm_auth_status_cache
);
40 static DEFINE_MUTEX(nvm_auth_status_lock
);
42 static struct nvm_auth_status
*__nvm_get_auth_status(const struct tb_switch
*sw
)
44 struct nvm_auth_status
*st
;
46 list_for_each_entry(st
, &nvm_auth_status_cache
, list
) {
47 if (uuid_equal(&st
->uuid
, sw
->uuid
))
54 static void nvm_get_auth_status(const struct tb_switch
*sw
, u32
*status
)
56 struct nvm_auth_status
*st
;
58 mutex_lock(&nvm_auth_status_lock
);
59 st
= __nvm_get_auth_status(sw
);
60 mutex_unlock(&nvm_auth_status_lock
);
62 *status
= st
? st
->status
: 0;
65 static void nvm_set_auth_status(const struct tb_switch
*sw
, u32 status
)
67 struct nvm_auth_status
*st
;
69 if (WARN_ON(!sw
->uuid
))
72 mutex_lock(&nvm_auth_status_lock
);
73 st
= __nvm_get_auth_status(sw
);
76 st
= kzalloc(sizeof(*st
), GFP_KERNEL
);
80 memcpy(&st
->uuid
, sw
->uuid
, sizeof(st
->uuid
));
81 INIT_LIST_HEAD(&st
->list
);
82 list_add_tail(&st
->list
, &nvm_auth_status_cache
);
87 mutex_unlock(&nvm_auth_status_lock
);
90 static void nvm_clear_auth_status(const struct tb_switch
*sw
)
92 struct nvm_auth_status
*st
;
94 mutex_lock(&nvm_auth_status_lock
);
95 st
= __nvm_get_auth_status(sw
);
100 mutex_unlock(&nvm_auth_status_lock
);
103 static int nvm_validate_and_write(struct tb_switch
*sw
)
105 unsigned int image_size
, hdr_size
;
106 const u8
*buf
= sw
->nvm
->buf
;
113 image_size
= sw
->nvm
->buf_data_size
;
114 if (image_size
< NVM_MIN_SIZE
|| image_size
> NVM_MAX_SIZE
)
118 * FARB pointer must point inside the image and must at least
119 * contain parts of the digital section we will be reading here.
121 hdr_size
= (*(u32
*)buf
) & 0xffffff;
122 if (hdr_size
+ NVM_DEVID
+ 2 >= image_size
)
125 /* Digital section start should be aligned to 4k page */
126 if (!IS_ALIGNED(hdr_size
, SZ_4K
))
130 * Read digital section size and check that it also fits inside
133 ds_size
= *(u16
*)(buf
+ hdr_size
);
134 if (ds_size
>= image_size
)
137 if (!sw
->safe_mode
) {
141 * Make sure the device ID in the image matches the one
142 * we read from the switch config space.
144 device_id
= *(u16
*)(buf
+ hdr_size
+ NVM_DEVID
);
145 if (device_id
!= sw
->config
.device_id
)
148 if (sw
->generation
< 3) {
149 /* Write CSS headers first */
150 ret
= dma_port_flash_write(sw
->dma_port
,
151 DMA_PORT_CSS_ADDRESS
, buf
+ NVM_CSS
,
152 DMA_PORT_CSS_MAX_SIZE
);
157 /* Skip headers in the image */
159 image_size
-= hdr_size
;
162 if (tb_switch_is_usb4(sw
))
163 ret
= usb4_switch_nvm_write(sw
, 0, buf
, image_size
);
165 ret
= dma_port_flash_write(sw
->dma_port
, 0, buf
, image_size
);
167 sw
->nvm
->flushed
= true;
171 static int nvm_authenticate_host_dma_port(struct tb_switch
*sw
)
176 * Root switch NVM upgrade requires that we disconnect the
177 * existing paths first (in case it is not in safe mode
180 if (!sw
->safe_mode
) {
183 ret
= tb_domain_disconnect_all_paths(sw
->tb
);
187 * The host controller goes away pretty soon after this if
188 * everything goes well so getting timeout is expected.
190 ret
= dma_port_flash_update_auth(sw
->dma_port
);
191 if (!ret
|| ret
== -ETIMEDOUT
)
195 * Any error from update auth operation requires power
196 * cycling of the host router.
198 tb_sw_warn(sw
, "failed to authenticate NVM, power cycling\n");
199 if (dma_port_flash_update_auth_status(sw
->dma_port
, &status
) > 0)
200 nvm_set_auth_status(sw
, status
);
204 * From safe mode we can get out by just power cycling the
207 dma_port_power_cycle(sw
->dma_port
);
211 static int nvm_authenticate_device_dma_port(struct tb_switch
*sw
)
213 int ret
, retries
= 10;
215 ret
= dma_port_flash_update_auth(sw
->dma_port
);
221 /* Power cycle is required */
228 * Poll here for the authentication status. It takes some time
229 * for the device to respond (we get timeout for a while). Once
230 * we get response the device needs to be power cycled in order
231 * to the new NVM to be taken into use.
236 ret
= dma_port_flash_update_auth_status(sw
->dma_port
, &status
);
237 if (ret
< 0 && ret
!= -ETIMEDOUT
)
241 tb_sw_warn(sw
, "failed to authenticate NVM\n");
242 nvm_set_auth_status(sw
, status
);
245 tb_sw_info(sw
, "power cycling the switch now\n");
246 dma_port_power_cycle(sw
->dma_port
);
256 static void nvm_authenticate_start_dma_port(struct tb_switch
*sw
)
258 struct pci_dev
*root_port
;
261 * During host router NVM upgrade we should not allow root port to
262 * go into D3cold because some root ports cannot trigger PME
263 * itself. To be on the safe side keep the root port in D0 during
264 * the whole upgrade process.
266 root_port
= pcie_find_root_port(sw
->tb
->nhi
->pdev
);
268 pm_runtime_get_noresume(&root_port
->dev
);
271 static void nvm_authenticate_complete_dma_port(struct tb_switch
*sw
)
273 struct pci_dev
*root_port
;
275 root_port
= pcie_find_root_port(sw
->tb
->nhi
->pdev
);
277 pm_runtime_put(&root_port
->dev
);
280 static inline bool nvm_readable(struct tb_switch
*sw
)
282 if (tb_switch_is_usb4(sw
)) {
284 * USB4 devices must support NVM operations but it is
285 * optional for hosts. Therefore we query the NVM sector
286 * size here and if it is supported assume NVM
287 * operations are implemented.
289 return usb4_switch_nvm_sector_size(sw
) > 0;
292 /* Thunderbolt 2 and 3 devices support NVM through DMA port */
293 return !!sw
->dma_port
;
296 static inline bool nvm_upgradeable(struct tb_switch
*sw
)
298 if (sw
->no_nvm_upgrade
)
300 return nvm_readable(sw
);
303 static inline int nvm_read(struct tb_switch
*sw
, unsigned int address
,
304 void *buf
, size_t size
)
306 if (tb_switch_is_usb4(sw
))
307 return usb4_switch_nvm_read(sw
, address
, buf
, size
);
308 return dma_port_flash_read(sw
->dma_port
, address
, buf
, size
);
311 static int nvm_authenticate(struct tb_switch
*sw
)
315 if (tb_switch_is_usb4(sw
))
316 return usb4_switch_nvm_authenticate(sw
);
319 nvm_authenticate_start_dma_port(sw
);
320 ret
= nvm_authenticate_host_dma_port(sw
);
322 ret
= nvm_authenticate_device_dma_port(sw
);
328 static int tb_switch_nvm_read(void *priv
, unsigned int offset
, void *val
,
331 struct tb_nvm
*nvm
= priv
;
332 struct tb_switch
*sw
= tb_to_switch(nvm
->dev
);
335 pm_runtime_get_sync(&sw
->dev
);
337 if (!mutex_trylock(&sw
->tb
->lock
)) {
338 ret
= restart_syscall();
342 ret
= nvm_read(sw
, offset
, val
, bytes
);
343 mutex_unlock(&sw
->tb
->lock
);
346 pm_runtime_mark_last_busy(&sw
->dev
);
347 pm_runtime_put_autosuspend(&sw
->dev
);
352 static int tb_switch_nvm_write(void *priv
, unsigned int offset
, void *val
,
355 struct tb_nvm
*nvm
= priv
;
356 struct tb_switch
*sw
= tb_to_switch(nvm
->dev
);
359 if (!mutex_trylock(&sw
->tb
->lock
))
360 return restart_syscall();
363 * Since writing the NVM image might require some special steps,
364 * for example when CSS headers are written, we cache the image
365 * locally here and handle the special cases when the user asks
366 * us to authenticate the image.
368 ret
= tb_nvm_write_buf(nvm
, offset
, val
, bytes
);
369 mutex_unlock(&sw
->tb
->lock
);
374 static int tb_switch_nvm_add(struct tb_switch
*sw
)
380 if (!nvm_readable(sw
))
384 * The NVM format of non-Intel hardware is not known so
385 * currently restrict NVM upgrade for Intel hardware. We may
386 * relax this in the future when we learn other NVM formats.
388 if (sw
->config
.vendor_id
!= PCI_VENDOR_ID_INTEL
&&
389 sw
->config
.vendor_id
!= 0x8087) {
391 "NVM format of vendor %#x is not known, disabling NVM upgrade\n",
392 sw
->config
.vendor_id
);
396 nvm
= tb_nvm_alloc(&sw
->dev
);
401 * If the switch is in safe-mode the only accessible portion of
402 * the NVM is the non-active one where userspace is expected to
403 * write new functional NVM.
405 if (!sw
->safe_mode
) {
406 u32 nvm_size
, hdr_size
;
408 ret
= nvm_read(sw
, NVM_FLASH_SIZE
, &val
, sizeof(val
));
412 hdr_size
= sw
->generation
< 3 ? SZ_8K
: SZ_16K
;
413 nvm_size
= (SZ_1M
<< (val
& 7)) / 8;
414 nvm_size
= (nvm_size
- hdr_size
) / 2;
416 ret
= nvm_read(sw
, NVM_VERSION
, &val
, sizeof(val
));
420 nvm
->major
= val
>> 16;
421 nvm
->minor
= val
>> 8;
423 ret
= tb_nvm_add_active(nvm
, nvm_size
, tb_switch_nvm_read
);
428 if (!sw
->no_nvm_upgrade
) {
429 ret
= tb_nvm_add_non_active(nvm
, NVM_MAX_SIZE
,
430 tb_switch_nvm_write
);
443 static void tb_switch_nvm_remove(struct tb_switch
*sw
)
453 /* Remove authentication status in case the switch is unplugged */
454 if (!nvm
->authenticating
)
455 nvm_clear_auth_status(sw
);
460 /* port utility functions */
462 static const char *tb_port_type(struct tb_regs_port_header
*port
)
464 switch (port
->type
>> 16) {
466 switch ((u8
) port
->type
) {
491 static void tb_dump_port(struct tb
*tb
, struct tb_regs_port_header
*port
)
494 " Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n",
495 port
->port_number
, port
->vendor_id
, port
->device_id
,
496 port
->revision
, port
->thunderbolt_version
, tb_port_type(port
),
498 tb_dbg(tb
, " Max hop id (in/out): %d/%d\n",
499 port
->max_in_hop_id
, port
->max_out_hop_id
);
500 tb_dbg(tb
, " Max counters: %d\n", port
->max_counters
);
501 tb_dbg(tb
, " NFC Credits: %#x\n", port
->nfc_credits
);
505 * tb_port_state() - get connectedness state of a port
506 * @port: the port to check
508 * The port must have a TB_CAP_PHY (i.e. it should be a real port).
510 * Return: Returns an enum tb_port_state on success or an error code on failure.
512 int tb_port_state(struct tb_port
*port
)
514 struct tb_cap_phy phy
;
516 if (port
->cap_phy
== 0) {
517 tb_port_WARN(port
, "does not have a PHY\n");
520 res
= tb_port_read(port
, &phy
, TB_CFG_PORT
, port
->cap_phy
, 2);
527 * tb_wait_for_port() - wait for a port to become ready
528 * @port: Port to wait
529 * @wait_if_unplugged: Wait also when port is unplugged
531 * Wait up to 1 second for a port to reach state TB_PORT_UP. If
532 * wait_if_unplugged is set then we also wait if the port is in state
533 * TB_PORT_UNPLUGGED (it takes a while for the device to be registered after
534 * switch resume). Otherwise we only wait if a device is registered but the link
535 * has not yet been established.
537 * Return: Returns an error code on failure. Returns 0 if the port is not
538 * connected or failed to reach state TB_PORT_UP within one second. Returns 1
539 * if the port is connected and in state TB_PORT_UP.
541 int tb_wait_for_port(struct tb_port
*port
, bool wait_if_unplugged
)
545 if (!port
->cap_phy
) {
546 tb_port_WARN(port
, "does not have PHY\n");
549 if (tb_is_upstream_port(port
)) {
550 tb_port_WARN(port
, "is the upstream port\n");
555 state
= tb_port_state(port
);
558 if (state
== TB_PORT_DISABLED
) {
559 tb_port_dbg(port
, "is disabled (state: 0)\n");
562 if (state
== TB_PORT_UNPLUGGED
) {
563 if (wait_if_unplugged
) {
564 /* used during resume */
566 "is unplugged (state: 7), retrying...\n");
570 tb_port_dbg(port
, "is unplugged (state: 7)\n");
573 if (state
== TB_PORT_UP
) {
574 tb_port_dbg(port
, "is connected, link is up (state: 2)\n");
579 * After plug-in the state is TB_PORT_CONNECTING. Give it some
583 "is connected, link is not up (state: %d), retrying...\n",
588 "failed to reach state TB_PORT_UP. Ignoring port...\n");
593 * tb_port_add_nfc_credits() - add/remove non flow controlled credits to port
594 * @port: Port to add/remove NFC credits
595 * @credits: Credits to add/remove
597 * Change the number of NFC credits allocated to @port by @credits. To remove
598 * NFC credits pass a negative amount of credits.
600 * Return: Returns 0 on success or an error code on failure.
602 int tb_port_add_nfc_credits(struct tb_port
*port
, int credits
)
606 if (credits
== 0 || port
->sw
->is_unplugged
)
610 * USB4 restricts programming NFC buffers to lane adapters only
611 * so skip other ports.
613 if (tb_switch_is_usb4(port
->sw
) && !tb_port_is_null(port
))
616 nfc_credits
= port
->config
.nfc_credits
& ADP_CS_4_NFC_BUFFERS_MASK
;
617 nfc_credits
+= credits
;
619 tb_port_dbg(port
, "adding %d NFC credits to %lu", credits
,
620 port
->config
.nfc_credits
& ADP_CS_4_NFC_BUFFERS_MASK
);
622 port
->config
.nfc_credits
&= ~ADP_CS_4_NFC_BUFFERS_MASK
;
623 port
->config
.nfc_credits
|= nfc_credits
;
625 return tb_port_write(port
, &port
->config
.nfc_credits
,
626 TB_CFG_PORT
, ADP_CS_4
, 1);
630 * tb_port_clear_counter() - clear a counter in TB_CFG_COUNTER
631 * @port: Port whose counters to clear
632 * @counter: Counter index to clear
634 * Return: Returns 0 on success or an error code on failure.
636 int tb_port_clear_counter(struct tb_port
*port
, int counter
)
638 u32 zero
[3] = { 0, 0, 0 };
639 tb_port_dbg(port
, "clearing counter %d\n", counter
);
640 return tb_port_write(port
, zero
, TB_CFG_COUNTERS
, 3 * counter
, 3);
644 * tb_port_unlock() - Unlock downstream port
645 * @port: Port to unlock
647 * Needed for USB4 but can be called for any CIO/USB4 ports. Makes the
648 * downstream router accessible for CM.
650 int tb_port_unlock(struct tb_port
*port
)
652 if (tb_switch_is_icm(port
->sw
))
654 if (!tb_port_is_null(port
))
656 if (tb_switch_is_usb4(port
->sw
))
657 return usb4_port_unlock(port
);
661 static int __tb_port_enable(struct tb_port
*port
, bool enable
)
666 if (!tb_port_is_null(port
))
669 ret
= tb_port_read(port
, &phy
, TB_CFG_PORT
,
670 port
->cap_phy
+ LANE_ADP_CS_1
, 1);
675 phy
&= ~LANE_ADP_CS_1_LD
;
677 phy
|= LANE_ADP_CS_1_LD
;
679 return tb_port_write(port
, &phy
, TB_CFG_PORT
,
680 port
->cap_phy
+ LANE_ADP_CS_1
, 1);
684 * tb_port_enable() - Enable lane adapter
685 * @port: Port to enable (can be %NULL)
687 * This is used for lane 0 and 1 adapters to enable it.
689 int tb_port_enable(struct tb_port
*port
)
691 return __tb_port_enable(port
, true);
695 * tb_port_disable() - Disable lane adapter
696 * @port: Port to disable (can be %NULL)
698 * This is used for lane 0 and 1 adapters to disable it.
700 int tb_port_disable(struct tb_port
*port
)
702 return __tb_port_enable(port
, false);
706 * tb_init_port() - initialize a port
708 * This is a helper method for tb_switch_alloc. Does not check or initialize
709 * any downstream switches.
711 * Return: Returns 0 on success or an error code on failure.
713 static int tb_init_port(struct tb_port
*port
)
718 res
= tb_port_read(port
, &port
->config
, TB_CFG_PORT
, 0, 8);
720 if (res
== -ENODEV
) {
721 tb_dbg(port
->sw
->tb
, " Port %d: not implemented\n",
723 port
->disabled
= true;
729 /* Port 0 is the switch itself and has no PHY. */
730 if (port
->config
.type
== TB_TYPE_PORT
&& port
->port
!= 0) {
731 cap
= tb_port_find_cap(port
, TB_PORT_CAP_PHY
);
736 tb_port_WARN(port
, "non switch port without a PHY\n");
738 cap
= tb_port_find_cap(port
, TB_PORT_CAP_USB4
);
740 port
->cap_usb4
= cap
;
741 } else if (port
->port
!= 0) {
742 cap
= tb_port_find_cap(port
, TB_PORT_CAP_ADAP
);
744 port
->cap_adap
= cap
;
747 tb_dump_port(port
->sw
->tb
, &port
->config
);
749 INIT_LIST_HEAD(&port
->list
);
754 static int tb_port_alloc_hopid(struct tb_port
*port
, bool in
, int min_hopid
,
761 port_max_hopid
= port
->config
.max_in_hop_id
;
762 ida
= &port
->in_hopids
;
764 port_max_hopid
= port
->config
.max_out_hop_id
;
765 ida
= &port
->out_hopids
;
769 * NHI can use HopIDs 1-max for other adapters HopIDs 0-7 are
772 if (!tb_port_is_nhi(port
) && min_hopid
< TB_PATH_MIN_HOPID
)
773 min_hopid
= TB_PATH_MIN_HOPID
;
775 if (max_hopid
< 0 || max_hopid
> port_max_hopid
)
776 max_hopid
= port_max_hopid
;
778 return ida_simple_get(ida
, min_hopid
, max_hopid
+ 1, GFP_KERNEL
);
782 * tb_port_alloc_in_hopid() - Allocate input HopID from port
783 * @port: Port to allocate HopID for
784 * @min_hopid: Minimum acceptable input HopID
785 * @max_hopid: Maximum acceptable input HopID
787 * Return: HopID between @min_hopid and @max_hopid or negative errno in
790 int tb_port_alloc_in_hopid(struct tb_port
*port
, int min_hopid
, int max_hopid
)
792 return tb_port_alloc_hopid(port
, true, min_hopid
, max_hopid
);
796 * tb_port_alloc_out_hopid() - Allocate output HopID from port
797 * @port: Port to allocate HopID for
798 * @min_hopid: Minimum acceptable output HopID
799 * @max_hopid: Maximum acceptable output HopID
801 * Return: HopID between @min_hopid and @max_hopid or negative errno in
804 int tb_port_alloc_out_hopid(struct tb_port
*port
, int min_hopid
, int max_hopid
)
806 return tb_port_alloc_hopid(port
, false, min_hopid
, max_hopid
);
810 * tb_port_release_in_hopid() - Release allocated input HopID from port
811 * @port: Port whose HopID to release
812 * @hopid: HopID to release
814 void tb_port_release_in_hopid(struct tb_port
*port
, int hopid
)
816 ida_simple_remove(&port
->in_hopids
, hopid
);
820 * tb_port_release_out_hopid() - Release allocated output HopID from port
821 * @port: Port whose HopID to release
822 * @hopid: HopID to release
824 void tb_port_release_out_hopid(struct tb_port
*port
, int hopid
)
826 ida_simple_remove(&port
->out_hopids
, hopid
);
829 static inline bool tb_switch_is_reachable(const struct tb_switch
*parent
,
830 const struct tb_switch
*sw
)
832 u64 mask
= (1ULL << parent
->config
.depth
* 8) - 1;
833 return (tb_route(parent
) & mask
) == (tb_route(sw
) & mask
);
837 * tb_next_port_on_path() - Return next port for given port on a path
838 * @start: Start port of the walk
839 * @end: End port of the walk
840 * @prev: Previous port (%NULL if this is the first)
842 * This function can be used to walk from one port to another if they
843 * are connected through zero or more switches. If the @prev is dual
844 * link port, the function follows that link and returns another end on
847 * If the @end port has been reached, return %NULL.
849 * Domain tb->lock must be held when this function is called.
851 struct tb_port
*tb_next_port_on_path(struct tb_port
*start
, struct tb_port
*end
,
852 struct tb_port
*prev
)
854 struct tb_port
*next
;
859 if (prev
->sw
== end
->sw
) {
865 if (tb_switch_is_reachable(prev
->sw
, end
->sw
)) {
866 next
= tb_port_at(tb_route(end
->sw
), prev
->sw
);
867 /* Walk down the topology if next == prev */
869 (next
== prev
|| next
->dual_link_port
== prev
))
872 if (tb_is_upstream_port(prev
)) {
875 next
= tb_upstream_port(prev
->sw
);
877 * Keep the same link if prev and next are both
880 if (next
->dual_link_port
&&
881 next
->link_nr
!= prev
->link_nr
) {
882 next
= next
->dual_link_port
;
887 return next
!= prev
? next
: NULL
;
891 * tb_port_get_link_speed() - Get current link speed
892 * @port: Port to check (USB4 or CIO)
894 * Returns link speed in Gb/s or negative errno in case of failure.
896 int tb_port_get_link_speed(struct tb_port
*port
)
904 ret
= tb_port_read(port
, &val
, TB_CFG_PORT
,
905 port
->cap_phy
+ LANE_ADP_CS_1
, 1);
909 speed
= (val
& LANE_ADP_CS_1_CURRENT_SPEED_MASK
) >>
910 LANE_ADP_CS_1_CURRENT_SPEED_SHIFT
;
911 return speed
== LANE_ADP_CS_1_CURRENT_SPEED_GEN3
? 20 : 10;
915 * tb_port_get_link_width() - Get current link width
916 * @port: Port to check (USB4 or CIO)
918 * Returns link width. Return values can be 1 (Single-Lane), 2 (Dual-Lane)
919 * or negative errno in case of failure.
921 int tb_port_get_link_width(struct tb_port
*port
)
929 ret
= tb_port_read(port
, &val
, TB_CFG_PORT
,
930 port
->cap_phy
+ LANE_ADP_CS_1
, 1);
934 return (val
& LANE_ADP_CS_1_CURRENT_WIDTH_MASK
) >>
935 LANE_ADP_CS_1_CURRENT_WIDTH_SHIFT
;
938 static bool tb_port_is_width_supported(struct tb_port
*port
, int width
)
946 ret
= tb_port_read(port
, &phy
, TB_CFG_PORT
,
947 port
->cap_phy
+ LANE_ADP_CS_0
, 1);
951 widths
= (phy
& LANE_ADP_CS_0_SUPPORTED_WIDTH_MASK
) >>
952 LANE_ADP_CS_0_SUPPORTED_WIDTH_SHIFT
;
954 return !!(widths
& width
);
957 static int tb_port_set_link_width(struct tb_port
*port
, unsigned int width
)
965 ret
= tb_port_read(port
, &val
, TB_CFG_PORT
,
966 port
->cap_phy
+ LANE_ADP_CS_1
, 1);
970 val
&= ~LANE_ADP_CS_1_TARGET_WIDTH_MASK
;
973 val
|= LANE_ADP_CS_1_TARGET_WIDTH_SINGLE
<<
974 LANE_ADP_CS_1_TARGET_WIDTH_SHIFT
;
977 val
|= LANE_ADP_CS_1_TARGET_WIDTH_DUAL
<<
978 LANE_ADP_CS_1_TARGET_WIDTH_SHIFT
;
984 val
|= LANE_ADP_CS_1_LB
;
986 return tb_port_write(port
, &val
, TB_CFG_PORT
,
987 port
->cap_phy
+ LANE_ADP_CS_1
, 1);
991 * tb_port_lane_bonding_enable() - Enable bonding on port
992 * @port: port to enable
994 * Enable bonding by setting the link width of the port and the
995 * other port in case of dual link port.
997 * Return: %0 in case of success and negative errno in case of error
999 int tb_port_lane_bonding_enable(struct tb_port
*port
)
1004 * Enable lane bonding for both links if not already enabled by
1005 * for example the boot firmware.
1007 ret
= tb_port_get_link_width(port
);
1009 ret
= tb_port_set_link_width(port
, 2);
1014 ret
= tb_port_get_link_width(port
->dual_link_port
);
1016 ret
= tb_port_set_link_width(port
->dual_link_port
, 2);
1018 tb_port_set_link_width(port
, 1);
1023 port
->bonded
= true;
1024 port
->dual_link_port
->bonded
= true;
1030 * tb_port_lane_bonding_disable() - Disable bonding on port
1031 * @port: port to disable
1033 * Disable bonding by setting the link width of the port and the
1034 * other port in case of dual link port.
1037 void tb_port_lane_bonding_disable(struct tb_port
*port
)
1039 port
->dual_link_port
->bonded
= false;
1040 port
->bonded
= false;
1042 tb_port_set_link_width(port
->dual_link_port
, 1);
1043 tb_port_set_link_width(port
, 1);
1046 static int tb_port_start_lane_initialization(struct tb_port
*port
)
1050 if (tb_switch_is_usb4(port
->sw
))
1053 ret
= tb_lc_start_lane_initialization(port
);
1054 return ret
== -EINVAL
? 0 : ret
;
1058 * tb_port_is_enabled() - Is the adapter port enabled
1059 * @port: Port to check
1061 bool tb_port_is_enabled(struct tb_port
*port
)
1063 switch (port
->config
.type
) {
1064 case TB_TYPE_PCIE_UP
:
1065 case TB_TYPE_PCIE_DOWN
:
1066 return tb_pci_port_is_enabled(port
);
1068 case TB_TYPE_DP_HDMI_IN
:
1069 case TB_TYPE_DP_HDMI_OUT
:
1070 return tb_dp_port_is_enabled(port
);
1072 case TB_TYPE_USB3_UP
:
1073 case TB_TYPE_USB3_DOWN
:
1074 return tb_usb3_port_is_enabled(port
);
1082 * tb_usb3_port_is_enabled() - Is the USB3 adapter port enabled
1083 * @port: USB3 adapter port to check
1085 bool tb_usb3_port_is_enabled(struct tb_port
*port
)
1089 if (tb_port_read(port
, &data
, TB_CFG_PORT
,
1090 port
->cap_adap
+ ADP_USB3_CS_0
, 1))
1093 return !!(data
& ADP_USB3_CS_0_PE
);
1097 * tb_usb3_port_enable() - Enable USB3 adapter port
1098 * @port: USB3 adapter port to enable
1099 * @enable: Enable/disable the USB3 adapter
1101 int tb_usb3_port_enable(struct tb_port
*port
, bool enable
)
1103 u32 word
= enable
? (ADP_USB3_CS_0_PE
| ADP_USB3_CS_0_V
)
1106 if (!port
->cap_adap
)
1108 return tb_port_write(port
, &word
, TB_CFG_PORT
,
1109 port
->cap_adap
+ ADP_USB3_CS_0
, 1);
1113 * tb_pci_port_is_enabled() - Is the PCIe adapter port enabled
1114 * @port: PCIe port to check
1116 bool tb_pci_port_is_enabled(struct tb_port
*port
)
1120 if (tb_port_read(port
, &data
, TB_CFG_PORT
,
1121 port
->cap_adap
+ ADP_PCIE_CS_0
, 1))
1124 return !!(data
& ADP_PCIE_CS_0_PE
);
1128 * tb_pci_port_enable() - Enable PCIe adapter port
1129 * @port: PCIe port to enable
1130 * @enable: Enable/disable the PCIe adapter
1132 int tb_pci_port_enable(struct tb_port
*port
, bool enable
)
1134 u32 word
= enable
? ADP_PCIE_CS_0_PE
: 0x0;
1135 if (!port
->cap_adap
)
1137 return tb_port_write(port
, &word
, TB_CFG_PORT
,
1138 port
->cap_adap
+ ADP_PCIE_CS_0
, 1);
1142 * tb_dp_port_hpd_is_active() - Is HPD already active
1143 * @port: DP out port to check
1145 * Checks if the DP OUT adapter port has HDP bit already set.
1147 int tb_dp_port_hpd_is_active(struct tb_port
*port
)
1152 ret
= tb_port_read(port
, &data
, TB_CFG_PORT
,
1153 port
->cap_adap
+ ADP_DP_CS_2
, 1);
1157 return !!(data
& ADP_DP_CS_2_HDP
);
1161 * tb_dp_port_hpd_clear() - Clear HPD from DP IN port
1162 * @port: Port to clear HPD
1164 * If the DP IN port has HDP set, this function can be used to clear it.
1166 int tb_dp_port_hpd_clear(struct tb_port
*port
)
1171 ret
= tb_port_read(port
, &data
, TB_CFG_PORT
,
1172 port
->cap_adap
+ ADP_DP_CS_3
, 1);
1176 data
|= ADP_DP_CS_3_HDPC
;
1177 return tb_port_write(port
, &data
, TB_CFG_PORT
,
1178 port
->cap_adap
+ ADP_DP_CS_3
, 1);
1182 * tb_dp_port_set_hops() - Set video/aux Hop IDs for DP port
1183 * @port: DP IN/OUT port to set hops
1184 * @video: Video Hop ID
1185 * @aux_tx: AUX TX Hop ID
1186 * @aux_rx: AUX RX Hop ID
1188 * Programs specified Hop IDs for DP IN/OUT port.
1190 int tb_dp_port_set_hops(struct tb_port
*port
, unsigned int video
,
1191 unsigned int aux_tx
, unsigned int aux_rx
)
1196 ret
= tb_port_read(port
, data
, TB_CFG_PORT
,
1197 port
->cap_adap
+ ADP_DP_CS_0
, ARRAY_SIZE(data
));
1201 data
[0] &= ~ADP_DP_CS_0_VIDEO_HOPID_MASK
;
1202 data
[1] &= ~ADP_DP_CS_1_AUX_RX_HOPID_MASK
;
1203 data
[1] &= ~ADP_DP_CS_1_AUX_RX_HOPID_MASK
;
1205 data
[0] |= (video
<< ADP_DP_CS_0_VIDEO_HOPID_SHIFT
) &
1206 ADP_DP_CS_0_VIDEO_HOPID_MASK
;
1207 data
[1] |= aux_tx
& ADP_DP_CS_1_AUX_TX_HOPID_MASK
;
1208 data
[1] |= (aux_rx
<< ADP_DP_CS_1_AUX_RX_HOPID_SHIFT
) &
1209 ADP_DP_CS_1_AUX_RX_HOPID_MASK
;
1211 return tb_port_write(port
, data
, TB_CFG_PORT
,
1212 port
->cap_adap
+ ADP_DP_CS_0
, ARRAY_SIZE(data
));
1216 * tb_dp_port_is_enabled() - Is DP adapter port enabled
1217 * @port: DP adapter port to check
1219 bool tb_dp_port_is_enabled(struct tb_port
*port
)
1223 if (tb_port_read(port
, data
, TB_CFG_PORT
, port
->cap_adap
+ ADP_DP_CS_0
,
1227 return !!(data
[0] & (ADP_DP_CS_0_VE
| ADP_DP_CS_0_AE
));
1231 * tb_dp_port_enable() - Enables/disables DP paths of a port
1232 * @port: DP IN/OUT port
1233 * @enable: Enable/disable DP path
1235 * Once Hop IDs are programmed DP paths can be enabled or disabled by
1236 * calling this function.
1238 int tb_dp_port_enable(struct tb_port
*port
, bool enable
)
1243 ret
= tb_port_read(port
, data
, TB_CFG_PORT
,
1244 port
->cap_adap
+ ADP_DP_CS_0
, ARRAY_SIZE(data
));
1249 data
[0] |= ADP_DP_CS_0_VE
| ADP_DP_CS_0_AE
;
1251 data
[0] &= ~(ADP_DP_CS_0_VE
| ADP_DP_CS_0_AE
);
1253 return tb_port_write(port
, data
, TB_CFG_PORT
,
1254 port
->cap_adap
+ ADP_DP_CS_0
, ARRAY_SIZE(data
));
1257 /* switch utility functions */
1259 static const char *tb_switch_generation_name(const struct tb_switch
*sw
)
1261 switch (sw
->generation
) {
1263 return "Thunderbolt 1";
1265 return "Thunderbolt 2";
1267 return "Thunderbolt 3";
1275 static void tb_dump_switch(const struct tb
*tb
, const struct tb_switch
*sw
)
1277 const struct tb_regs_switch_header
*regs
= &sw
->config
;
1279 tb_dbg(tb
, " %s Switch: %x:%x (Revision: %d, TB Version: %d)\n",
1280 tb_switch_generation_name(sw
), regs
->vendor_id
, regs
->device_id
,
1281 regs
->revision
, regs
->thunderbolt_version
);
1282 tb_dbg(tb
, " Max Port Number: %d\n", regs
->max_port_number
);
1283 tb_dbg(tb
, " Config:\n");
1285 " Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n",
1286 regs
->upstream_port_number
, regs
->depth
,
1287 (((u64
) regs
->route_hi
) << 32) | regs
->route_lo
,
1288 regs
->enabled
, regs
->plug_events_delay
);
1289 tb_dbg(tb
, " unknown1: %#x unknown4: %#x\n",
1290 regs
->__unknown1
, regs
->__unknown4
);
1294 * tb_switch_reset() - reconfigure route, enable and send TB_CFG_PKG_RESET
1295 * @sw: Switch to reset
1297 * Return: Returns 0 on success or an error code on failure.
1299 int tb_switch_reset(struct tb_switch
*sw
)
1301 struct tb_cfg_result res
;
1303 if (sw
->generation
> 1)
1306 tb_sw_dbg(sw
, "resetting switch\n");
1308 res
.err
= tb_sw_write(sw
, ((u32
*) &sw
->config
) + 2,
1309 TB_CFG_SWITCH
, 2, 2);
1312 res
= tb_cfg_reset(sw
->tb
->ctl
, tb_route(sw
));
1319 * tb_plug_events_active() - enable/disable plug events on a switch
1321 * Also configures a sane plug_events_delay of 255ms.
1323 * Return: Returns 0 on success or an error code on failure.
1325 static int tb_plug_events_active(struct tb_switch
*sw
, bool active
)
1330 if (tb_switch_is_icm(sw
) || tb_switch_is_usb4(sw
))
1333 sw
->config
.plug_events_delay
= 0xff;
1334 res
= tb_sw_write(sw
, ((u32
*) &sw
->config
) + 4, TB_CFG_SWITCH
, 4, 1);
1338 res
= tb_sw_read(sw
, &data
, TB_CFG_SWITCH
, sw
->cap_plug_events
+ 1, 1);
1343 data
= data
& 0xFFFFFF83;
1344 switch (sw
->config
.device_id
) {
1345 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE
:
1346 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE
:
1347 case PCI_DEVICE_ID_INTEL_PORT_RIDGE
:
1355 return tb_sw_write(sw
, &data
, TB_CFG_SWITCH
,
1356 sw
->cap_plug_events
+ 1, 1);
1359 static ssize_t
authorized_show(struct device
*dev
,
1360 struct device_attribute
*attr
,
1363 struct tb_switch
*sw
= tb_to_switch(dev
);
1365 return sprintf(buf
, "%u\n", sw
->authorized
);
1368 static int disapprove_switch(struct device
*dev
, void *not_used
)
1370 struct tb_switch
*sw
;
1372 sw
= tb_to_switch(dev
);
1373 if (sw
&& sw
->authorized
) {
1376 /* First children */
1377 ret
= device_for_each_child_reverse(&sw
->dev
, NULL
, disapprove_switch
);
1381 ret
= tb_domain_disapprove_switch(sw
->tb
, sw
);
1386 kobject_uevent(&sw
->dev
.kobj
, KOBJ_CHANGE
);
1392 static int tb_switch_set_authorized(struct tb_switch
*sw
, unsigned int val
)
1396 if (!mutex_trylock(&sw
->tb
->lock
))
1397 return restart_syscall();
1399 if (!!sw
->authorized
== !!val
)
1403 /* Disapprove switch */
1406 ret
= disapprove_switch(&sw
->dev
, NULL
);
1411 /* Approve switch */
1414 ret
= tb_domain_approve_switch_key(sw
->tb
, sw
);
1416 ret
= tb_domain_approve_switch(sw
->tb
, sw
);
1419 /* Challenge switch */
1422 ret
= tb_domain_challenge_switch_key(sw
->tb
, sw
);
1430 sw
->authorized
= val
;
1431 /* Notify status change to the userspace */
1432 kobject_uevent(&sw
->dev
.kobj
, KOBJ_CHANGE
);
1436 mutex_unlock(&sw
->tb
->lock
);
1440 static ssize_t
authorized_store(struct device
*dev
,
1441 struct device_attribute
*attr
,
1442 const char *buf
, size_t count
)
1444 struct tb_switch
*sw
= tb_to_switch(dev
);
1448 ret
= kstrtouint(buf
, 0, &val
);
1454 pm_runtime_get_sync(&sw
->dev
);
1455 ret
= tb_switch_set_authorized(sw
, val
);
1456 pm_runtime_mark_last_busy(&sw
->dev
);
1457 pm_runtime_put_autosuspend(&sw
->dev
);
1459 return ret
? ret
: count
;
1461 static DEVICE_ATTR_RW(authorized
);
1463 static ssize_t
boot_show(struct device
*dev
, struct device_attribute
*attr
,
1466 struct tb_switch
*sw
= tb_to_switch(dev
);
1468 return sprintf(buf
, "%u\n", sw
->boot
);
1470 static DEVICE_ATTR_RO(boot
);
1472 static ssize_t
device_show(struct device
*dev
, struct device_attribute
*attr
,
1475 struct tb_switch
*sw
= tb_to_switch(dev
);
1477 return sprintf(buf
, "%#x\n", sw
->device
);
1479 static DEVICE_ATTR_RO(device
);
1482 device_name_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
1484 struct tb_switch
*sw
= tb_to_switch(dev
);
1486 return sprintf(buf
, "%s\n", sw
->device_name
? sw
->device_name
: "");
1488 static DEVICE_ATTR_RO(device_name
);
1491 generation_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
1493 struct tb_switch
*sw
= tb_to_switch(dev
);
1495 return sprintf(buf
, "%u\n", sw
->generation
);
1497 static DEVICE_ATTR_RO(generation
);
1499 static ssize_t
key_show(struct device
*dev
, struct device_attribute
*attr
,
1502 struct tb_switch
*sw
= tb_to_switch(dev
);
1505 if (!mutex_trylock(&sw
->tb
->lock
))
1506 return restart_syscall();
1509 ret
= sprintf(buf
, "%*phN\n", TB_SWITCH_KEY_SIZE
, sw
->key
);
1511 ret
= sprintf(buf
, "\n");
1513 mutex_unlock(&sw
->tb
->lock
);
1517 static ssize_t
key_store(struct device
*dev
, struct device_attribute
*attr
,
1518 const char *buf
, size_t count
)
1520 struct tb_switch
*sw
= tb_to_switch(dev
);
1521 u8 key
[TB_SWITCH_KEY_SIZE
];
1522 ssize_t ret
= count
;
1525 if (!strcmp(buf
, "\n"))
1527 else if (hex2bin(key
, buf
, sizeof(key
)))
1530 if (!mutex_trylock(&sw
->tb
->lock
))
1531 return restart_syscall();
1533 if (sw
->authorized
) {
1540 sw
->key
= kmemdup(key
, sizeof(key
), GFP_KERNEL
);
1546 mutex_unlock(&sw
->tb
->lock
);
1549 static DEVICE_ATTR(key
, 0600, key_show
, key_store
);
1551 static ssize_t
speed_show(struct device
*dev
, struct device_attribute
*attr
,
1554 struct tb_switch
*sw
= tb_to_switch(dev
);
1556 return sprintf(buf
, "%u.0 Gb/s\n", sw
->link_speed
);
1560 * Currently all lanes must run at the same speed but we expose here
1561 * both directions to allow possible asymmetric links in the future.
1563 static DEVICE_ATTR(rx_speed
, 0444, speed_show
, NULL
);
1564 static DEVICE_ATTR(tx_speed
, 0444, speed_show
, NULL
);
1566 static ssize_t
lanes_show(struct device
*dev
, struct device_attribute
*attr
,
1569 struct tb_switch
*sw
= tb_to_switch(dev
);
1571 return sprintf(buf
, "%u\n", sw
->link_width
);
1575 * Currently link has same amount of lanes both directions (1 or 2) but
1576 * expose them separately to allow possible asymmetric links in the future.
1578 static DEVICE_ATTR(rx_lanes
, 0444, lanes_show
, NULL
);
1579 static DEVICE_ATTR(tx_lanes
, 0444, lanes_show
, NULL
);
1581 static ssize_t
nvm_authenticate_show(struct device
*dev
,
1582 struct device_attribute
*attr
, char *buf
)
1584 struct tb_switch
*sw
= tb_to_switch(dev
);
1587 nvm_get_auth_status(sw
, &status
);
1588 return sprintf(buf
, "%#x\n", status
);
1591 static ssize_t
nvm_authenticate_sysfs(struct device
*dev
, const char *buf
,
1594 struct tb_switch
*sw
= tb_to_switch(dev
);
1598 pm_runtime_get_sync(&sw
->dev
);
1600 if (!mutex_trylock(&sw
->tb
->lock
)) {
1601 ret
= restart_syscall();
1605 /* If NVMem devices are not yet added */
1611 ret
= kstrtoint(buf
, 10, &val
);
1615 /* Always clear the authentication status */
1616 nvm_clear_auth_status(sw
);
1619 if (!sw
->nvm
->flushed
) {
1620 if (!sw
->nvm
->buf
) {
1625 ret
= nvm_validate_and_write(sw
);
1626 if (ret
|| val
== WRITE_ONLY
)
1629 if (val
== WRITE_AND_AUTHENTICATE
) {
1631 ret
= tb_lc_force_power(sw
);
1633 sw
->nvm
->authenticating
= true;
1634 ret
= nvm_authenticate(sw
);
1640 mutex_unlock(&sw
->tb
->lock
);
1642 pm_runtime_mark_last_busy(&sw
->dev
);
1643 pm_runtime_put_autosuspend(&sw
->dev
);
1648 static ssize_t
nvm_authenticate_store(struct device
*dev
,
1649 struct device_attribute
*attr
, const char *buf
, size_t count
)
1651 int ret
= nvm_authenticate_sysfs(dev
, buf
, false);
1656 static DEVICE_ATTR_RW(nvm_authenticate
);
1658 static ssize_t
nvm_authenticate_on_disconnect_show(struct device
*dev
,
1659 struct device_attribute
*attr
, char *buf
)
1661 return nvm_authenticate_show(dev
, attr
, buf
);
1664 static ssize_t
nvm_authenticate_on_disconnect_store(struct device
*dev
,
1665 struct device_attribute
*attr
, const char *buf
, size_t count
)
1669 ret
= nvm_authenticate_sysfs(dev
, buf
, true);
1670 return ret
? ret
: count
;
1672 static DEVICE_ATTR_RW(nvm_authenticate_on_disconnect
);
1674 static ssize_t
nvm_version_show(struct device
*dev
,
1675 struct device_attribute
*attr
, char *buf
)
1677 struct tb_switch
*sw
= tb_to_switch(dev
);
1680 if (!mutex_trylock(&sw
->tb
->lock
))
1681 return restart_syscall();
1688 ret
= sprintf(buf
, "%x.%x\n", sw
->nvm
->major
, sw
->nvm
->minor
);
1690 mutex_unlock(&sw
->tb
->lock
);
1694 static DEVICE_ATTR_RO(nvm_version
);
1696 static ssize_t
vendor_show(struct device
*dev
, struct device_attribute
*attr
,
1699 struct tb_switch
*sw
= tb_to_switch(dev
);
1701 return sprintf(buf
, "%#x\n", sw
->vendor
);
1703 static DEVICE_ATTR_RO(vendor
);
1706 vendor_name_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
1708 struct tb_switch
*sw
= tb_to_switch(dev
);
1710 return sprintf(buf
, "%s\n", sw
->vendor_name
? sw
->vendor_name
: "");
1712 static DEVICE_ATTR_RO(vendor_name
);
1714 static ssize_t
unique_id_show(struct device
*dev
, struct device_attribute
*attr
,
1717 struct tb_switch
*sw
= tb_to_switch(dev
);
1719 return sprintf(buf
, "%pUb\n", sw
->uuid
);
1721 static DEVICE_ATTR_RO(unique_id
);
1723 static struct attribute
*switch_attrs
[] = {
1724 &dev_attr_authorized
.attr
,
1725 &dev_attr_boot
.attr
,
1726 &dev_attr_device
.attr
,
1727 &dev_attr_device_name
.attr
,
1728 &dev_attr_generation
.attr
,
1730 &dev_attr_nvm_authenticate
.attr
,
1731 &dev_attr_nvm_authenticate_on_disconnect
.attr
,
1732 &dev_attr_nvm_version
.attr
,
1733 &dev_attr_rx_speed
.attr
,
1734 &dev_attr_rx_lanes
.attr
,
1735 &dev_attr_tx_speed
.attr
,
1736 &dev_attr_tx_lanes
.attr
,
1737 &dev_attr_vendor
.attr
,
1738 &dev_attr_vendor_name
.attr
,
1739 &dev_attr_unique_id
.attr
,
1743 static bool has_port(const struct tb_switch
*sw
, enum tb_port_type type
)
1745 const struct tb_port
*port
;
1747 tb_switch_for_each_port(sw
, port
) {
1748 if (!port
->disabled
&& port
->config
.type
== type
)
1755 static umode_t
switch_attr_is_visible(struct kobject
*kobj
,
1756 struct attribute
*attr
, int n
)
1758 struct device
*dev
= kobj_to_dev(kobj
);
1759 struct tb_switch
*sw
= tb_to_switch(dev
);
1761 if (attr
== &dev_attr_authorized
.attr
) {
1762 if (sw
->tb
->security_level
== TB_SECURITY_NOPCIE
||
1763 sw
->tb
->security_level
== TB_SECURITY_DPONLY
||
1764 !has_port(sw
, TB_TYPE_PCIE_UP
))
1766 } else if (attr
== &dev_attr_device
.attr
) {
1769 } else if (attr
== &dev_attr_device_name
.attr
) {
1770 if (!sw
->device_name
)
1772 } else if (attr
== &dev_attr_vendor
.attr
) {
1775 } else if (attr
== &dev_attr_vendor_name
.attr
) {
1776 if (!sw
->vendor_name
)
1778 } else if (attr
== &dev_attr_key
.attr
) {
1780 sw
->tb
->security_level
== TB_SECURITY_SECURE
&&
1781 sw
->security_level
== TB_SECURITY_SECURE
)
1784 } else if (attr
== &dev_attr_rx_speed
.attr
||
1785 attr
== &dev_attr_rx_lanes
.attr
||
1786 attr
== &dev_attr_tx_speed
.attr
||
1787 attr
== &dev_attr_tx_lanes
.attr
) {
1791 } else if (attr
== &dev_attr_nvm_authenticate
.attr
) {
1792 if (nvm_upgradeable(sw
))
1795 } else if (attr
== &dev_attr_nvm_version
.attr
) {
1796 if (nvm_readable(sw
))
1799 } else if (attr
== &dev_attr_boot
.attr
) {
1803 } else if (attr
== &dev_attr_nvm_authenticate_on_disconnect
.attr
) {
1804 if (sw
->quirks
& QUIRK_FORCE_POWER_LINK_CONTROLLER
)
1809 return sw
->safe_mode
? 0 : attr
->mode
;
1812 static const struct attribute_group switch_group
= {
1813 .is_visible
= switch_attr_is_visible
,
1814 .attrs
= switch_attrs
,
1817 static const struct attribute_group
*switch_groups
[] = {
1822 static void tb_switch_release(struct device
*dev
)
1824 struct tb_switch
*sw
= tb_to_switch(dev
);
1825 struct tb_port
*port
;
1827 dma_port_free(sw
->dma_port
);
1829 tb_switch_for_each_port(sw
, port
) {
1830 ida_destroy(&port
->in_hopids
);
1831 ida_destroy(&port
->out_hopids
);
1835 kfree(sw
->device_name
);
1836 kfree(sw
->vendor_name
);
1843 static int tb_switch_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
1845 struct tb_switch
*sw
= tb_to_switch(dev
);
1848 if (sw
->config
.thunderbolt_version
== USB4_VERSION_1_0
) {
1849 if (add_uevent_var(env
, "USB4_VERSION=1.0"))
1853 if (!tb_route(sw
)) {
1856 const struct tb_port
*port
;
1859 /* Device is hub if it has any downstream ports */
1860 tb_switch_for_each_port(sw
, port
) {
1861 if (!port
->disabled
&& !tb_is_upstream_port(port
) &&
1862 tb_port_is_null(port
)) {
1868 type
= hub
? "hub" : "device";
1871 if (add_uevent_var(env
, "USB4_TYPE=%s", type
))
1877 * Currently only need to provide the callbacks. Everything else is handled
1878 * in the connection manager.
1880 static int __maybe_unused
tb_switch_runtime_suspend(struct device
*dev
)
1882 struct tb_switch
*sw
= tb_to_switch(dev
);
1883 const struct tb_cm_ops
*cm_ops
= sw
->tb
->cm_ops
;
1885 if (cm_ops
->runtime_suspend_switch
)
1886 return cm_ops
->runtime_suspend_switch(sw
);
1891 static int __maybe_unused
tb_switch_runtime_resume(struct device
*dev
)
1893 struct tb_switch
*sw
= tb_to_switch(dev
);
1894 const struct tb_cm_ops
*cm_ops
= sw
->tb
->cm_ops
;
1896 if (cm_ops
->runtime_resume_switch
)
1897 return cm_ops
->runtime_resume_switch(sw
);
1901 static const struct dev_pm_ops tb_switch_pm_ops
= {
1902 SET_RUNTIME_PM_OPS(tb_switch_runtime_suspend
, tb_switch_runtime_resume
,
1906 struct device_type tb_switch_type
= {
1907 .name
= "thunderbolt_device",
1908 .release
= tb_switch_release
,
1909 .uevent
= tb_switch_uevent
,
1910 .pm
= &tb_switch_pm_ops
,
1913 static int tb_switch_get_generation(struct tb_switch
*sw
)
1915 switch (sw
->config
.device_id
) {
1916 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE
:
1917 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE
:
1918 case PCI_DEVICE_ID_INTEL_LIGHT_PEAK
:
1919 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_2C
:
1920 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C
:
1921 case PCI_DEVICE_ID_INTEL_PORT_RIDGE
:
1922 case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_2C_BRIDGE
:
1923 case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_4C_BRIDGE
:
1926 case PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_BRIDGE
:
1927 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE
:
1928 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE
:
1931 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE
:
1932 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_BRIDGE
:
1933 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_BRIDGE
:
1934 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE
:
1935 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE
:
1936 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_BRIDGE
:
1937 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_BRIDGE
:
1938 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_BRIDGE
:
1939 case PCI_DEVICE_ID_INTEL_ICL_NHI0
:
1940 case PCI_DEVICE_ID_INTEL_ICL_NHI1
:
1944 if (tb_switch_is_usb4(sw
))
1948 * For unknown switches assume generation to be 1 to be
1951 tb_sw_warn(sw
, "unsupported switch device id %#x\n",
1952 sw
->config
.device_id
);
1957 static bool tb_switch_exceeds_max_depth(const struct tb_switch
*sw
, int depth
)
1961 if (tb_switch_is_usb4(sw
) ||
1962 (sw
->tb
->root_switch
&& tb_switch_is_usb4(sw
->tb
->root_switch
)))
1963 max_depth
= USB4_SWITCH_MAX_DEPTH
;
1965 max_depth
= TB_SWITCH_MAX_DEPTH
;
1967 return depth
> max_depth
;
1971 * tb_switch_alloc() - allocate a switch
1972 * @tb: Pointer to the owning domain
1973 * @parent: Parent device for this switch
1974 * @route: Route string for this switch
1976 * Allocates and initializes a switch. Will not upload configuration to
1977 * the switch. For that you need to call tb_switch_configure()
1978 * separately. The returned switch should be released by calling
1981 * Return: Pointer to the allocated switch or ERR_PTR() in case of
1984 struct tb_switch
*tb_switch_alloc(struct tb
*tb
, struct device
*parent
,
1987 struct tb_switch
*sw
;
1991 /* Unlock the downstream port so we can access the switch below */
1993 struct tb_switch
*parent_sw
= tb_to_switch(parent
);
1994 struct tb_port
*down
;
1996 down
= tb_port_at(route
, parent_sw
);
1997 tb_port_unlock(down
);
2000 depth
= tb_route_length(route
);
2002 upstream_port
= tb_cfg_get_upstream_port(tb
->ctl
, route
);
2003 if (upstream_port
< 0)
2004 return ERR_PTR(upstream_port
);
2006 sw
= kzalloc(sizeof(*sw
), GFP_KERNEL
);
2008 return ERR_PTR(-ENOMEM
);
2011 ret
= tb_cfg_read(tb
->ctl
, &sw
->config
, route
, 0, TB_CFG_SWITCH
, 0, 5);
2013 goto err_free_sw_ports
;
2015 sw
->generation
= tb_switch_get_generation(sw
);
2017 tb_dbg(tb
, "current switch config:\n");
2018 tb_dump_switch(tb
, sw
);
2020 /* configure switch */
2021 sw
->config
.upstream_port_number
= upstream_port
;
2022 sw
->config
.depth
= depth
;
2023 sw
->config
.route_hi
= upper_32_bits(route
);
2024 sw
->config
.route_lo
= lower_32_bits(route
);
2025 sw
->config
.enabled
= 0;
2027 /* Make sure we do not exceed maximum topology limit */
2028 if (tb_switch_exceeds_max_depth(sw
, depth
)) {
2029 ret
= -EADDRNOTAVAIL
;
2030 goto err_free_sw_ports
;
2033 /* initialize ports */
2034 sw
->ports
= kcalloc(sw
->config
.max_port_number
+ 1, sizeof(*sw
->ports
),
2038 goto err_free_sw_ports
;
2041 for (i
= 0; i
<= sw
->config
.max_port_number
; i
++) {
2042 /* minimum setup for tb_find_cap and tb_drom_read to work */
2043 sw
->ports
[i
].sw
= sw
;
2044 sw
->ports
[i
].port
= i
;
2046 /* Control port does not need HopID allocation */
2048 ida_init(&sw
->ports
[i
].in_hopids
);
2049 ida_init(&sw
->ports
[i
].out_hopids
);
2053 ret
= tb_switch_find_vse_cap(sw
, TB_VSE_CAP_PLUG_EVENTS
);
2055 sw
->cap_plug_events
= ret
;
2057 ret
= tb_switch_find_vse_cap(sw
, TB_VSE_CAP_LINK_CONTROLLER
);
2061 /* Root switch is always authorized */
2063 sw
->authorized
= true;
2065 device_initialize(&sw
->dev
);
2066 sw
->dev
.parent
= parent
;
2067 sw
->dev
.bus
= &tb_bus_type
;
2068 sw
->dev
.type
= &tb_switch_type
;
2069 sw
->dev
.groups
= switch_groups
;
2070 dev_set_name(&sw
->dev
, "%u-%llx", tb
->index
, tb_route(sw
));
2078 return ERR_PTR(ret
);
2082 * tb_switch_alloc_safe_mode() - allocate a switch that is in safe mode
2083 * @tb: Pointer to the owning domain
2084 * @parent: Parent device for this switch
2085 * @route: Route string for this switch
2087 * This creates a switch in safe mode. This means the switch pretty much
2088 * lacks all capabilities except DMA configuration port before it is
2089 * flashed with a valid NVM firmware.
2091 * The returned switch must be released by calling tb_switch_put().
2093 * Return: Pointer to the allocated switch or ERR_PTR() in case of failure
2096 tb_switch_alloc_safe_mode(struct tb
*tb
, struct device
*parent
, u64 route
)
2098 struct tb_switch
*sw
;
2100 sw
= kzalloc(sizeof(*sw
), GFP_KERNEL
);
2102 return ERR_PTR(-ENOMEM
);
2105 sw
->config
.depth
= tb_route_length(route
);
2106 sw
->config
.route_hi
= upper_32_bits(route
);
2107 sw
->config
.route_lo
= lower_32_bits(route
);
2108 sw
->safe_mode
= true;
2110 device_initialize(&sw
->dev
);
2111 sw
->dev
.parent
= parent
;
2112 sw
->dev
.bus
= &tb_bus_type
;
2113 sw
->dev
.type
= &tb_switch_type
;
2114 sw
->dev
.groups
= switch_groups
;
2115 dev_set_name(&sw
->dev
, "%u-%llx", tb
->index
, tb_route(sw
));
2121 * tb_switch_configure() - Uploads configuration to the switch
2122 * @sw: Switch to configure
2124 * Call this function before the switch is added to the system. It will
2125 * upload configuration to the switch and makes it available for the
2126 * connection manager to use. Can be called to the switch again after
2127 * resume from low power states to re-initialize it.
2129 * Return: %0 in case of success and negative errno in case of failure
2131 int tb_switch_configure(struct tb_switch
*sw
)
2133 struct tb
*tb
= sw
->tb
;
2137 route
= tb_route(sw
);
2139 tb_dbg(tb
, "%s Switch at %#llx (depth: %d, up port: %d)\n",
2140 sw
->config
.enabled
? "restoring" : "initializing", route
,
2141 tb_route_length(route
), sw
->config
.upstream_port_number
);
2143 sw
->config
.enabled
= 1;
2145 if (tb_switch_is_usb4(sw
)) {
2147 * For USB4 devices, we need to program the CM version
2148 * accordingly so that it knows to expose all the
2149 * additional capabilities.
2151 sw
->config
.cmuv
= USB4_VERSION_1_0
;
2153 /* Enumerate the switch */
2154 ret
= tb_sw_write(sw
, (u32
*)&sw
->config
+ 1, TB_CFG_SWITCH
,
2159 ret
= usb4_switch_setup(sw
);
2161 if (sw
->config
.vendor_id
!= PCI_VENDOR_ID_INTEL
)
2162 tb_sw_warn(sw
, "unknown switch vendor id %#x\n",
2163 sw
->config
.vendor_id
);
2165 if (!sw
->cap_plug_events
) {
2166 tb_sw_warn(sw
, "cannot find TB_VSE_CAP_PLUG_EVENTS aborting\n");
2170 /* Enumerate the switch */
2171 ret
= tb_sw_write(sw
, (u32
*)&sw
->config
+ 1, TB_CFG_SWITCH
,
2177 return tb_plug_events_active(sw
, true);
2180 static int tb_switch_set_uuid(struct tb_switch
*sw
)
2189 if (tb_switch_is_usb4(sw
)) {
2190 ret
= usb4_switch_read_uid(sw
, &sw
->uid
);
2196 * The newer controllers include fused UUID as part of
2197 * link controller specific registers
2199 ret
= tb_lc_read_uuid(sw
, uuid
);
2209 * ICM generates UUID based on UID and fills the upper
2210 * two words with ones. This is not strictly following
2211 * UUID format but we want to be compatible with it so
2212 * we do the same here.
2214 uuid
[0] = sw
->uid
& 0xffffffff;
2215 uuid
[1] = (sw
->uid
>> 32) & 0xffffffff;
2216 uuid
[2] = 0xffffffff;
2217 uuid
[3] = 0xffffffff;
2220 sw
->uuid
= kmemdup(uuid
, sizeof(uuid
), GFP_KERNEL
);
2226 static int tb_switch_add_dma_port(struct tb_switch
*sw
)
2231 switch (sw
->generation
) {
2233 /* Only root switch can be upgraded */
2240 ret
= tb_switch_set_uuid(sw
);
2247 * DMA port is the only thing available when the switch
2255 if (sw
->no_nvm_upgrade
)
2258 if (tb_switch_is_usb4(sw
)) {
2259 ret
= usb4_switch_nvm_authenticate_status(sw
, &status
);
2264 tb_sw_info(sw
, "switch flash authentication failed\n");
2265 nvm_set_auth_status(sw
, status
);
2271 /* Root switch DMA port requires running firmware */
2272 if (!tb_route(sw
) && !tb_switch_is_icm(sw
))
2275 sw
->dma_port
= dma_port_alloc(sw
);
2280 * If there is status already set then authentication failed
2281 * when the dma_port_flash_update_auth() returned. Power cycling
2282 * is not needed (it was done already) so only thing we do here
2283 * is to unblock runtime PM of the root port.
2285 nvm_get_auth_status(sw
, &status
);
2288 nvm_authenticate_complete_dma_port(sw
);
2293 * Check status of the previous flash authentication. If there
2294 * is one we need to power cycle the switch in any case to make
2295 * it functional again.
2297 ret
= dma_port_flash_update_auth_status(sw
->dma_port
, &status
);
2301 /* Now we can allow root port to suspend again */
2303 nvm_authenticate_complete_dma_port(sw
);
2306 tb_sw_info(sw
, "switch flash authentication failed\n");
2307 nvm_set_auth_status(sw
, status
);
2310 tb_sw_info(sw
, "power cycling the switch now\n");
2311 dma_port_power_cycle(sw
->dma_port
);
2314 * We return error here which causes the switch adding failure.
2315 * It should appear back after power cycle is complete.
2320 static void tb_switch_default_link_ports(struct tb_switch
*sw
)
2324 for (i
= 1; i
<= sw
->config
.max_port_number
; i
+= 2) {
2325 struct tb_port
*port
= &sw
->ports
[i
];
2326 struct tb_port
*subordinate
;
2328 if (!tb_port_is_null(port
))
2331 /* Check for the subordinate port */
2332 if (i
== sw
->config
.max_port_number
||
2333 !tb_port_is_null(&sw
->ports
[i
+ 1]))
2336 /* Link them if not already done so (by DROM) */
2337 subordinate
= &sw
->ports
[i
+ 1];
2338 if (!port
->dual_link_port
&& !subordinate
->dual_link_port
) {
2340 port
->dual_link_port
= subordinate
;
2341 subordinate
->link_nr
= 1;
2342 subordinate
->dual_link_port
= port
;
2344 tb_sw_dbg(sw
, "linked ports %d <-> %d\n",
2345 port
->port
, subordinate
->port
);
2350 static bool tb_switch_lane_bonding_possible(struct tb_switch
*sw
)
2352 const struct tb_port
*up
= tb_upstream_port(sw
);
2354 if (!up
->dual_link_port
|| !up
->dual_link_port
->remote
)
2357 if (tb_switch_is_usb4(sw
))
2358 return usb4_switch_lane_bonding_possible(sw
);
2359 return tb_lc_lane_bonding_possible(sw
);
2362 static int tb_switch_update_link_attributes(struct tb_switch
*sw
)
2365 bool change
= false;
2368 if (!tb_route(sw
) || tb_switch_is_icm(sw
))
2371 up
= tb_upstream_port(sw
);
2373 ret
= tb_port_get_link_speed(up
);
2376 if (sw
->link_speed
!= ret
)
2378 sw
->link_speed
= ret
;
2380 ret
= tb_port_get_link_width(up
);
2383 if (sw
->link_width
!= ret
)
2385 sw
->link_width
= ret
;
2387 /* Notify userspace that there is possible link attribute change */
2388 if (device_is_registered(&sw
->dev
) && change
)
2389 kobject_uevent(&sw
->dev
.kobj
, KOBJ_CHANGE
);
2395 * tb_switch_lane_bonding_enable() - Enable lane bonding
2396 * @sw: Switch to enable lane bonding
2398 * Connection manager can call this function to enable lane bonding of a
2399 * switch. If conditions are correct and both switches support the feature,
2400 * lanes are bonded. It is safe to call this to any switch.
2402 int tb_switch_lane_bonding_enable(struct tb_switch
*sw
)
2404 struct tb_switch
*parent
= tb_to_switch(sw
->dev
.parent
);
2405 struct tb_port
*up
, *down
;
2406 u64 route
= tb_route(sw
);
2412 if (!tb_switch_lane_bonding_possible(sw
))
2415 up
= tb_upstream_port(sw
);
2416 down
= tb_port_at(route
, parent
);
2418 if (!tb_port_is_width_supported(up
, 2) ||
2419 !tb_port_is_width_supported(down
, 2))
2422 ret
= tb_port_lane_bonding_enable(up
);
2424 tb_port_warn(up
, "failed to enable lane bonding\n");
2428 ret
= tb_port_lane_bonding_enable(down
);
2430 tb_port_warn(down
, "failed to enable lane bonding\n");
2431 tb_port_lane_bonding_disable(up
);
2435 tb_switch_update_link_attributes(sw
);
2437 tb_sw_dbg(sw
, "lane bonding enabled\n");
2442 * tb_switch_lane_bonding_disable() - Disable lane bonding
2443 * @sw: Switch whose lane bonding to disable
2445 * Disables lane bonding between @sw and parent. This can be called even
2446 * if lanes were not bonded originally.
2448 void tb_switch_lane_bonding_disable(struct tb_switch
*sw
)
2450 struct tb_switch
*parent
= tb_to_switch(sw
->dev
.parent
);
2451 struct tb_port
*up
, *down
;
2456 up
= tb_upstream_port(sw
);
2460 down
= tb_port_at(tb_route(sw
), parent
);
2462 tb_port_lane_bonding_disable(up
);
2463 tb_port_lane_bonding_disable(down
);
2465 tb_switch_update_link_attributes(sw
);
2466 tb_sw_dbg(sw
, "lane bonding disabled\n");
2470 * tb_switch_configure_link() - Set link configured
2471 * @sw: Switch whose link is configured
2473 * Sets the link upstream from @sw configured (from both ends) so that
2474 * it will not be disconnected when the domain exits sleep. Can be
2475 * called for any switch.
2477 * It is recommended that this is called after lane bonding is enabled.
2479 * Returns %0 on success and negative errno in case of error.
2481 int tb_switch_configure_link(struct tb_switch
*sw
)
2483 struct tb_port
*up
, *down
;
2486 if (!tb_route(sw
) || tb_switch_is_icm(sw
))
2489 up
= tb_upstream_port(sw
);
2490 if (tb_switch_is_usb4(up
->sw
))
2491 ret
= usb4_port_configure(up
);
2493 ret
= tb_lc_configure_port(up
);
2498 if (tb_switch_is_usb4(down
->sw
))
2499 return usb4_port_configure(down
);
2500 return tb_lc_configure_port(down
);
2504 * tb_switch_unconfigure_link() - Unconfigure link
2505 * @sw: Switch whose link is unconfigured
2507 * Sets the link unconfigured so the @sw will be disconnected if the
2508 * domain exists sleep.
2510 void tb_switch_unconfigure_link(struct tb_switch
*sw
)
2512 struct tb_port
*up
, *down
;
2514 if (sw
->is_unplugged
)
2516 if (!tb_route(sw
) || tb_switch_is_icm(sw
))
2519 up
= tb_upstream_port(sw
);
2520 if (tb_switch_is_usb4(up
->sw
))
2521 usb4_port_unconfigure(up
);
2523 tb_lc_unconfigure_port(up
);
2526 if (tb_switch_is_usb4(down
->sw
))
2527 usb4_port_unconfigure(down
);
2529 tb_lc_unconfigure_port(down
);
2533 * tb_switch_add() - Add a switch to the domain
2534 * @sw: Switch to add
2536 * This is the last step in adding switch to the domain. It will read
2537 * identification information from DROM and initializes ports so that
2538 * they can be used to connect other switches. The switch will be
2539 * exposed to the userspace when this function successfully returns. To
2540 * remove and release the switch, call tb_switch_remove().
2542 * Return: %0 in case of success and negative errno in case of failure
2544 int tb_switch_add(struct tb_switch
*sw
)
2549 * Initialize DMA control port now before we read DROM. Recent
2550 * host controllers have more complete DROM on NVM that includes
2551 * vendor and model identification strings which we then expose
2552 * to the userspace. NVM can be accessed through DMA
2553 * configuration based mailbox.
2555 ret
= tb_switch_add_dma_port(sw
);
2557 dev_err(&sw
->dev
, "failed to add DMA port\n");
2561 if (!sw
->safe_mode
) {
2563 ret
= tb_drom_read(sw
);
2565 dev_err(&sw
->dev
, "reading DROM failed\n");
2568 tb_sw_dbg(sw
, "uid: %#llx\n", sw
->uid
);
2570 tb_check_quirks(sw
);
2572 ret
= tb_switch_set_uuid(sw
);
2574 dev_err(&sw
->dev
, "failed to set UUID\n");
2578 for (i
= 0; i
<= sw
->config
.max_port_number
; i
++) {
2579 if (sw
->ports
[i
].disabled
) {
2580 tb_port_dbg(&sw
->ports
[i
], "disabled by eeprom\n");
2583 ret
= tb_init_port(&sw
->ports
[i
]);
2585 dev_err(&sw
->dev
, "failed to initialize port %d\n", i
);
2590 tb_switch_default_link_ports(sw
);
2592 ret
= tb_switch_update_link_attributes(sw
);
2596 ret
= tb_switch_tmu_init(sw
);
2601 ret
= device_add(&sw
->dev
);
2603 dev_err(&sw
->dev
, "failed to add device: %d\n", ret
);
2608 dev_info(&sw
->dev
, "new device found, vendor=%#x device=%#x\n",
2609 sw
->vendor
, sw
->device
);
2610 if (sw
->vendor_name
&& sw
->device_name
)
2611 dev_info(&sw
->dev
, "%s %s\n", sw
->vendor_name
,
2615 ret
= tb_switch_nvm_add(sw
);
2617 dev_err(&sw
->dev
, "failed to add NVM devices\n");
2618 device_del(&sw
->dev
);
2623 * Thunderbolt routers do not generate wakeups themselves but
2624 * they forward wakeups from tunneled protocols, so enable it
2627 device_init_wakeup(&sw
->dev
, true);
2629 pm_runtime_set_active(&sw
->dev
);
2631 pm_runtime_set_autosuspend_delay(&sw
->dev
, TB_AUTOSUSPEND_DELAY
);
2632 pm_runtime_use_autosuspend(&sw
->dev
);
2633 pm_runtime_mark_last_busy(&sw
->dev
);
2634 pm_runtime_enable(&sw
->dev
);
2635 pm_request_autosuspend(&sw
->dev
);
2638 tb_switch_debugfs_init(sw
);
2643 * tb_switch_remove() - Remove and release a switch
2644 * @sw: Switch to remove
2646 * This will remove the switch from the domain and release it after last
2647 * reference count drops to zero. If there are switches connected below
2648 * this switch, they will be removed as well.
2650 void tb_switch_remove(struct tb_switch
*sw
)
2652 struct tb_port
*port
;
2654 tb_switch_debugfs_remove(sw
);
2657 pm_runtime_get_sync(&sw
->dev
);
2658 pm_runtime_disable(&sw
->dev
);
2661 /* port 0 is the switch itself and never has a remote */
2662 tb_switch_for_each_port(sw
, port
) {
2663 if (tb_port_has_remote(port
)) {
2664 tb_switch_remove(port
->remote
->sw
);
2665 port
->remote
= NULL
;
2666 } else if (port
->xdomain
) {
2667 tb_xdomain_remove(port
->xdomain
);
2668 port
->xdomain
= NULL
;
2671 /* Remove any downstream retimers */
2672 tb_retimer_remove_all(port
);
2675 if (!sw
->is_unplugged
)
2676 tb_plug_events_active(sw
, false);
2678 tb_switch_nvm_remove(sw
);
2681 dev_info(&sw
->dev
, "device disconnected\n");
2682 device_unregister(&sw
->dev
);
2686 * tb_sw_set_unplugged() - set is_unplugged on switch and downstream switches
2687 * @sw: Router to mark unplugged
2689 void tb_sw_set_unplugged(struct tb_switch
*sw
)
2691 struct tb_port
*port
;
2693 if (sw
== sw
->tb
->root_switch
) {
2694 tb_sw_WARN(sw
, "cannot unplug root switch\n");
2697 if (sw
->is_unplugged
) {
2698 tb_sw_WARN(sw
, "is_unplugged already set\n");
2701 sw
->is_unplugged
= true;
2702 tb_switch_for_each_port(sw
, port
) {
2703 if (tb_port_has_remote(port
))
2704 tb_sw_set_unplugged(port
->remote
->sw
);
2705 else if (port
->xdomain
)
2706 port
->xdomain
->is_unplugged
= true;
2710 static int tb_switch_set_wake(struct tb_switch
*sw
, unsigned int flags
)
2713 tb_sw_dbg(sw
, "enabling wakeup: %#x\n", flags
);
2715 tb_sw_dbg(sw
, "disabling wakeup\n");
2717 if (tb_switch_is_usb4(sw
))
2718 return usb4_switch_set_wake(sw
, flags
);
2719 return tb_lc_set_wake(sw
, flags
);
2722 int tb_switch_resume(struct tb_switch
*sw
)
2724 struct tb_port
*port
;
2727 tb_sw_dbg(sw
, "resuming switch\n");
2730 * Check for UID of the connected switches except for root
2731 * switch which we assume cannot be removed.
2737 * Check first that we can still read the switch config
2738 * space. It may be that there is now another domain
2741 err
= tb_cfg_get_upstream_port(sw
->tb
->ctl
, tb_route(sw
));
2743 tb_sw_info(sw
, "switch not present anymore\n");
2747 if (tb_switch_is_usb4(sw
))
2748 err
= usb4_switch_read_uid(sw
, &uid
);
2750 err
= tb_drom_read_uid_only(sw
, &uid
);
2752 tb_sw_warn(sw
, "uid read failed\n");
2755 if (sw
->uid
!= uid
) {
2757 "changed while suspended (uid %#llx -> %#llx)\n",
2763 err
= tb_switch_configure(sw
);
2768 tb_switch_set_wake(sw
, 0);
2770 err
= tb_switch_tmu_init(sw
);
2774 /* check for surviving downstream switches */
2775 tb_switch_for_each_port(sw
, port
) {
2776 if (!tb_port_has_remote(port
) && !port
->xdomain
) {
2778 * For disconnected downstream lane adapters
2779 * start lane initialization now so we detect
2782 if (!tb_is_upstream_port(port
) && tb_port_is_null(port
))
2783 tb_port_start_lane_initialization(port
);
2785 } else if (port
->xdomain
) {
2787 * Start lane initialization for XDomain so the
2788 * link gets re-established.
2790 tb_port_start_lane_initialization(port
);
2793 if (tb_wait_for_port(port
, true) <= 0) {
2795 "lost during suspend, disconnecting\n");
2796 if (tb_port_has_remote(port
))
2797 tb_sw_set_unplugged(port
->remote
->sw
);
2798 else if (port
->xdomain
)
2799 port
->xdomain
->is_unplugged
= true;
2800 } else if (tb_port_has_remote(port
) || port
->xdomain
) {
2802 * Always unlock the port so the downstream
2803 * switch/domain is accessible.
2805 if (tb_port_unlock(port
))
2806 tb_port_warn(port
, "failed to unlock port\n");
2807 if (port
->remote
&& tb_switch_resume(port
->remote
->sw
)) {
2809 "lost during suspend, disconnecting\n");
2810 tb_sw_set_unplugged(port
->remote
->sw
);
2818 * tb_switch_suspend() - Put a switch to sleep
2819 * @sw: Switch to suspend
2820 * @runtime: Is this runtime suspend or system sleep
2822 * Suspends router and all its children. Enables wakes according to
2823 * value of @runtime and then sets sleep bit for the router. If @sw is
2824 * host router the domain is ready to go to sleep once this function
2827 void tb_switch_suspend(struct tb_switch
*sw
, bool runtime
)
2829 unsigned int flags
= 0;
2830 struct tb_port
*port
;
2833 tb_sw_dbg(sw
, "suspending switch\n");
2835 err
= tb_plug_events_active(sw
, false);
2839 tb_switch_for_each_port(sw
, port
) {
2840 if (tb_port_has_remote(port
))
2841 tb_switch_suspend(port
->remote
->sw
, runtime
);
2845 /* Trigger wake when something is plugged in/out */
2846 flags
|= TB_WAKE_ON_CONNECT
| TB_WAKE_ON_DISCONNECT
;
2847 flags
|= TB_WAKE_ON_USB4
| TB_WAKE_ON_USB3
| TB_WAKE_ON_PCIE
;
2848 } else if (device_may_wakeup(&sw
->dev
)) {
2849 flags
|= TB_WAKE_ON_USB4
| TB_WAKE_ON_USB3
| TB_WAKE_ON_PCIE
;
2852 tb_switch_set_wake(sw
, flags
);
2854 if (tb_switch_is_usb4(sw
))
2855 usb4_switch_set_sleep(sw
);
2857 tb_lc_set_sleep(sw
);
2861 * tb_switch_query_dp_resource() - Query availability of DP resource
2862 * @sw: Switch whose DP resource is queried
2865 * Queries availability of DP resource for DP tunneling using switch
2866 * specific means. Returns %true if resource is available.
2868 bool tb_switch_query_dp_resource(struct tb_switch
*sw
, struct tb_port
*in
)
2870 if (tb_switch_is_usb4(sw
))
2871 return usb4_switch_query_dp_resource(sw
, in
);
2872 return tb_lc_dp_sink_query(sw
, in
);
2876 * tb_switch_alloc_dp_resource() - Allocate available DP resource
2877 * @sw: Switch whose DP resource is allocated
2880 * Allocates DP resource for DP tunneling. The resource must be
2881 * available for this to succeed (see tb_switch_query_dp_resource()).
2882 * Returns %0 in success and negative errno otherwise.
2884 int tb_switch_alloc_dp_resource(struct tb_switch
*sw
, struct tb_port
*in
)
2886 if (tb_switch_is_usb4(sw
))
2887 return usb4_switch_alloc_dp_resource(sw
, in
);
2888 return tb_lc_dp_sink_alloc(sw
, in
);
2892 * tb_switch_dealloc_dp_resource() - De-allocate DP resource
2893 * @sw: Switch whose DP resource is de-allocated
2896 * De-allocates DP resource that was previously allocated for DP
2899 void tb_switch_dealloc_dp_resource(struct tb_switch
*sw
, struct tb_port
*in
)
2903 if (tb_switch_is_usb4(sw
))
2904 ret
= usb4_switch_dealloc_dp_resource(sw
, in
);
2906 ret
= tb_lc_dp_sink_dealloc(sw
, in
);
2909 tb_sw_warn(sw
, "failed to de-allocate DP resource for port %d\n",
2913 struct tb_sw_lookup
{
2921 static int tb_switch_match(struct device
*dev
, const void *data
)
2923 struct tb_switch
*sw
= tb_to_switch(dev
);
2924 const struct tb_sw_lookup
*lookup
= data
;
2928 if (sw
->tb
!= lookup
->tb
)
2932 return !memcmp(sw
->uuid
, lookup
->uuid
, sizeof(*lookup
->uuid
));
2934 if (lookup
->route
) {
2935 return sw
->config
.route_lo
== lower_32_bits(lookup
->route
) &&
2936 sw
->config
.route_hi
== upper_32_bits(lookup
->route
);
2939 /* Root switch is matched only by depth */
2943 return sw
->link
== lookup
->link
&& sw
->depth
== lookup
->depth
;
2947 * tb_switch_find_by_link_depth() - Find switch by link and depth
2948 * @tb: Domain the switch belongs
2949 * @link: Link number the switch is connected
2950 * @depth: Depth of the switch in link
2952 * Returned switch has reference count increased so the caller needs to
2953 * call tb_switch_put() when done with the switch.
2955 struct tb_switch
*tb_switch_find_by_link_depth(struct tb
*tb
, u8 link
, u8 depth
)
2957 struct tb_sw_lookup lookup
;
2960 memset(&lookup
, 0, sizeof(lookup
));
2963 lookup
.depth
= depth
;
2965 dev
= bus_find_device(&tb_bus_type
, NULL
, &lookup
, tb_switch_match
);
2967 return tb_to_switch(dev
);
2973 * tb_switch_find_by_uuid() - Find switch by UUID
2974 * @tb: Domain the switch belongs
2975 * @uuid: UUID to look for
2977 * Returned switch has reference count increased so the caller needs to
2978 * call tb_switch_put() when done with the switch.
2980 struct tb_switch
*tb_switch_find_by_uuid(struct tb
*tb
, const uuid_t
*uuid
)
2982 struct tb_sw_lookup lookup
;
2985 memset(&lookup
, 0, sizeof(lookup
));
2989 dev
= bus_find_device(&tb_bus_type
, NULL
, &lookup
, tb_switch_match
);
2991 return tb_to_switch(dev
);
2997 * tb_switch_find_by_route() - Find switch by route string
2998 * @tb: Domain the switch belongs
2999 * @route: Route string to look for
3001 * Returned switch has reference count increased so the caller needs to
3002 * call tb_switch_put() when done with the switch.
3004 struct tb_switch
*tb_switch_find_by_route(struct tb
*tb
, u64 route
)
3006 struct tb_sw_lookup lookup
;
3010 return tb_switch_get(tb
->root_switch
);
3012 memset(&lookup
, 0, sizeof(lookup
));
3014 lookup
.route
= route
;
3016 dev
= bus_find_device(&tb_bus_type
, NULL
, &lookup
, tb_switch_match
);
3018 return tb_to_switch(dev
);
3024 * tb_switch_find_port() - return the first port of @type on @sw or NULL
3025 * @sw: Switch to find the port from
3026 * @type: Port type to look for
3028 struct tb_port
*tb_switch_find_port(struct tb_switch
*sw
,
3029 enum tb_port_type type
)
3031 struct tb_port
*port
;
3033 tb_switch_for_each_port(sw
, port
) {
3034 if (port
->config
.type
== type
)