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_set_initial_credits() - Set initial port link credits allocated
631 * @port: Port to set the initial credits
632 * @credits: Number of credits to to allocate
634 * Set initial credits value to be used for ingress shared buffering.
636 int tb_port_set_initial_credits(struct tb_port *port, u32 credits)
641 ret = tb_port_read(port, &data, TB_CFG_PORT, ADP_CS_5, 1);
645 data &= ~ADP_CS_5_LCA_MASK;
646 data |= (credits << ADP_CS_5_LCA_SHIFT) & ADP_CS_5_LCA_MASK;
648 return tb_port_write(port, &data, TB_CFG_PORT, ADP_CS_5, 1);
652 * tb_port_clear_counter() - clear a counter in TB_CFG_COUNTER
653 * @port: Port whose counters to clear
654 * @counter: Counter index to clear
656 * Return: Returns 0 on success or an error code on failure.
658 int tb_port_clear_counter(struct tb_port *port, int counter)
660 u32 zero[3] = { 0, 0, 0 };
661 tb_port_dbg(port, "clearing counter %d\n", counter);
662 return tb_port_write(port, zero, TB_CFG_COUNTERS, 3 * counter, 3);
666 * tb_port_unlock() - Unlock downstream port
667 * @port: Port to unlock
669 * Needed for USB4 but can be called for any CIO/USB4 ports. Makes the
670 * downstream router accessible for CM.
672 int tb_port_unlock(struct tb_port *port)
674 if (tb_switch_is_icm(port->sw))
676 if (!tb_port_is_null(port))
678 if (tb_switch_is_usb4(port->sw))
679 return usb4_port_unlock(port);
683 static int __tb_port_enable(struct tb_port *port, bool enable)
688 if (!tb_port_is_null(port))
691 ret = tb_port_read(port, &phy, TB_CFG_PORT,
692 port->cap_phy + LANE_ADP_CS_1, 1);
697 phy &= ~LANE_ADP_CS_1_LD;
699 phy |= LANE_ADP_CS_1_LD;
701 return tb_port_write(port, &phy, TB_CFG_PORT,
702 port->cap_phy + LANE_ADP_CS_1, 1);
706 * tb_port_enable() - Enable lane adapter
707 * @port: Port to enable (can be %NULL)
709 * This is used for lane 0 and 1 adapters to enable it.
711 int tb_port_enable(struct tb_port *port)
713 return __tb_port_enable(port, true);
717 * tb_port_disable() - Disable lane adapter
718 * @port: Port to disable (can be %NULL)
720 * This is used for lane 0 and 1 adapters to disable it.
722 int tb_port_disable(struct tb_port *port)
724 return __tb_port_enable(port, false);
728 * tb_init_port() - initialize a port
730 * This is a helper method for tb_switch_alloc. Does not check or initialize
731 * any downstream switches.
733 * Return: Returns 0 on success or an error code on failure.
735 static int tb_init_port(struct tb_port *port)
740 res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8);
742 if (res == -ENODEV) {
743 tb_dbg(port->sw->tb, " Port %d: not implemented\n",
745 port->disabled = true;
751 /* Port 0 is the switch itself and has no PHY. */
752 if (port->config.type == TB_TYPE_PORT && port->port != 0) {
753 cap = tb_port_find_cap(port, TB_PORT_CAP_PHY);
758 tb_port_WARN(port, "non switch port without a PHY\n");
760 cap = tb_port_find_cap(port, TB_PORT_CAP_USB4);
762 port->cap_usb4 = cap;
763 } else if (port->port != 0) {
764 cap = tb_port_find_cap(port, TB_PORT_CAP_ADAP);
766 port->cap_adap = cap;
769 tb_dump_port(port->sw->tb, &port->config);
771 INIT_LIST_HEAD(&port->list);
776 static int tb_port_alloc_hopid(struct tb_port *port, bool in, int min_hopid,
783 port_max_hopid = port->config.max_in_hop_id;
784 ida = &port->in_hopids;
786 port_max_hopid = port->config.max_out_hop_id;
787 ida = &port->out_hopids;
791 * NHI can use HopIDs 1-max for other adapters HopIDs 0-7 are
794 if (!tb_port_is_nhi(port) && min_hopid < TB_PATH_MIN_HOPID)
795 min_hopid = TB_PATH_MIN_HOPID;
797 if (max_hopid < 0 || max_hopid > port_max_hopid)
798 max_hopid = port_max_hopid;
800 return ida_simple_get(ida, min_hopid, max_hopid + 1, GFP_KERNEL);
804 * tb_port_alloc_in_hopid() - Allocate input HopID from port
805 * @port: Port to allocate HopID for
806 * @min_hopid: Minimum acceptable input HopID
807 * @max_hopid: Maximum acceptable input HopID
809 * Return: HopID between @min_hopid and @max_hopid or negative errno in
812 int tb_port_alloc_in_hopid(struct tb_port *port, int min_hopid, int max_hopid)
814 return tb_port_alloc_hopid(port, true, min_hopid, max_hopid);
818 * tb_port_alloc_out_hopid() - Allocate output HopID from port
819 * @port: Port to allocate HopID for
820 * @min_hopid: Minimum acceptable output HopID
821 * @max_hopid: Maximum acceptable output HopID
823 * Return: HopID between @min_hopid and @max_hopid or negative errno in
826 int tb_port_alloc_out_hopid(struct tb_port *port, int min_hopid, int max_hopid)
828 return tb_port_alloc_hopid(port, false, min_hopid, max_hopid);
832 * tb_port_release_in_hopid() - Release allocated input HopID from port
833 * @port: Port whose HopID to release
834 * @hopid: HopID to release
836 void tb_port_release_in_hopid(struct tb_port *port, int hopid)
838 ida_simple_remove(&port->in_hopids, hopid);
842 * tb_port_release_out_hopid() - Release allocated output HopID from port
843 * @port: Port whose HopID to release
844 * @hopid: HopID to release
846 void tb_port_release_out_hopid(struct tb_port *port, int hopid)
848 ida_simple_remove(&port->out_hopids, hopid);
851 static inline bool tb_switch_is_reachable(const struct tb_switch *parent,
852 const struct tb_switch *sw)
854 u64 mask = (1ULL << parent->config.depth * 8) - 1;
855 return (tb_route(parent) & mask) == (tb_route(sw) & mask);
859 * tb_next_port_on_path() - Return next port for given port on a path
860 * @start: Start port of the walk
861 * @end: End port of the walk
862 * @prev: Previous port (%NULL if this is the first)
864 * This function can be used to walk from one port to another if they
865 * are connected through zero or more switches. If the @prev is dual
866 * link port, the function follows that link and returns another end on
869 * If the @end port has been reached, return %NULL.
871 * Domain tb->lock must be held when this function is called.
873 struct tb_port *tb_next_port_on_path(struct tb_port *start, struct tb_port *end,
874 struct tb_port *prev)
876 struct tb_port *next;
881 if (prev->sw == end->sw) {
887 if (tb_switch_is_reachable(prev->sw, end->sw)) {
888 next = tb_port_at(tb_route(end->sw), prev->sw);
889 /* Walk down the topology if next == prev */
891 (next == prev || next->dual_link_port == prev))
894 if (tb_is_upstream_port(prev)) {
897 next = tb_upstream_port(prev->sw);
899 * Keep the same link if prev and next are both
902 if (next->dual_link_port &&
903 next->link_nr != prev->link_nr) {
904 next = next->dual_link_port;
909 return next != prev ? next : NULL;
913 * tb_port_get_link_speed() - Get current link speed
914 * @port: Port to check (USB4 or CIO)
916 * Returns link speed in Gb/s or negative errno in case of failure.
918 int tb_port_get_link_speed(struct tb_port *port)
926 ret = tb_port_read(port, &val, TB_CFG_PORT,
927 port->cap_phy + LANE_ADP_CS_1, 1);
931 speed = (val & LANE_ADP_CS_1_CURRENT_SPEED_MASK) >>
932 LANE_ADP_CS_1_CURRENT_SPEED_SHIFT;
933 return speed == LANE_ADP_CS_1_CURRENT_SPEED_GEN3 ? 20 : 10;
937 * tb_port_get_link_width() - Get current link width
938 * @port: Port to check (USB4 or CIO)
940 * Returns link width. Return values can be 1 (Single-Lane), 2 (Dual-Lane)
941 * or negative errno in case of failure.
943 int tb_port_get_link_width(struct tb_port *port)
951 ret = tb_port_read(port, &val, TB_CFG_PORT,
952 port->cap_phy + LANE_ADP_CS_1, 1);
956 return (val & LANE_ADP_CS_1_CURRENT_WIDTH_MASK) >>
957 LANE_ADP_CS_1_CURRENT_WIDTH_SHIFT;
960 static bool tb_port_is_width_supported(struct tb_port *port, int width)
968 ret = tb_port_read(port, &phy, TB_CFG_PORT,
969 port->cap_phy + LANE_ADP_CS_0, 1);
973 widths = (phy & LANE_ADP_CS_0_SUPPORTED_WIDTH_MASK) >>
974 LANE_ADP_CS_0_SUPPORTED_WIDTH_SHIFT;
976 return !!(widths & width);
979 static int tb_port_set_link_width(struct tb_port *port, unsigned int width)
987 ret = tb_port_read(port, &val, TB_CFG_PORT,
988 port->cap_phy + LANE_ADP_CS_1, 1);
992 val &= ~LANE_ADP_CS_1_TARGET_WIDTH_MASK;
995 val |= LANE_ADP_CS_1_TARGET_WIDTH_SINGLE <<
996 LANE_ADP_CS_1_TARGET_WIDTH_SHIFT;
999 val |= LANE_ADP_CS_1_TARGET_WIDTH_DUAL <<
1000 LANE_ADP_CS_1_TARGET_WIDTH_SHIFT;
1006 val |= LANE_ADP_CS_1_LB;
1008 return tb_port_write(port, &val, TB_CFG_PORT,
1009 port->cap_phy + LANE_ADP_CS_1, 1);
1013 * tb_port_lane_bonding_enable() - Enable bonding on port
1014 * @port: port to enable
1016 * Enable bonding by setting the link width of the port and the
1017 * other port in case of dual link port.
1019 * Return: %0 in case of success and negative errno in case of error
1021 int tb_port_lane_bonding_enable(struct tb_port *port)
1026 * Enable lane bonding for both links if not already enabled by
1027 * for example the boot firmware.
1029 ret = tb_port_get_link_width(port);
1031 ret = tb_port_set_link_width(port, 2);
1036 ret = tb_port_get_link_width(port->dual_link_port);
1038 ret = tb_port_set_link_width(port->dual_link_port, 2);
1040 tb_port_set_link_width(port, 1);
1045 port->bonded = true;
1046 port->dual_link_port->bonded = true;
1052 * tb_port_lane_bonding_disable() - Disable bonding on port
1053 * @port: port to disable
1055 * Disable bonding by setting the link width of the port and the
1056 * other port in case of dual link port.
1059 void tb_port_lane_bonding_disable(struct tb_port *port)
1061 port->dual_link_port->bonded = false;
1062 port->bonded = false;
1064 tb_port_set_link_width(port->dual_link_port, 1);
1065 tb_port_set_link_width(port, 1);
1068 static int tb_port_start_lane_initialization(struct tb_port *port)
1072 if (tb_switch_is_usb4(port->sw))
1075 ret = tb_lc_start_lane_initialization(port);
1076 return ret == -EINVAL ? 0 : ret;
1080 * tb_port_is_enabled() - Is the adapter port enabled
1081 * @port: Port to check
1083 bool tb_port_is_enabled(struct tb_port *port)
1085 switch (port->config.type) {
1086 case TB_TYPE_PCIE_UP:
1087 case TB_TYPE_PCIE_DOWN:
1088 return tb_pci_port_is_enabled(port);
1090 case TB_TYPE_DP_HDMI_IN:
1091 case TB_TYPE_DP_HDMI_OUT:
1092 return tb_dp_port_is_enabled(port);
1094 case TB_TYPE_USB3_UP:
1095 case TB_TYPE_USB3_DOWN:
1096 return tb_usb3_port_is_enabled(port);
1104 * tb_usb3_port_is_enabled() - Is the USB3 adapter port enabled
1105 * @port: USB3 adapter port to check
1107 bool tb_usb3_port_is_enabled(struct tb_port *port)
1111 if (tb_port_read(port, &data, TB_CFG_PORT,
1112 port->cap_adap + ADP_USB3_CS_0, 1))
1115 return !!(data & ADP_USB3_CS_0_PE);
1119 * tb_usb3_port_enable() - Enable USB3 adapter port
1120 * @port: USB3 adapter port to enable
1121 * @enable: Enable/disable the USB3 adapter
1123 int tb_usb3_port_enable(struct tb_port *port, bool enable)
1125 u32 word = enable ? (ADP_USB3_CS_0_PE | ADP_USB3_CS_0_V)
1128 if (!port->cap_adap)
1130 return tb_port_write(port, &word, TB_CFG_PORT,
1131 port->cap_adap + ADP_USB3_CS_0, 1);
1135 * tb_pci_port_is_enabled() - Is the PCIe adapter port enabled
1136 * @port: PCIe port to check
1138 bool tb_pci_port_is_enabled(struct tb_port *port)
1142 if (tb_port_read(port, &data, TB_CFG_PORT,
1143 port->cap_adap + ADP_PCIE_CS_0, 1))
1146 return !!(data & ADP_PCIE_CS_0_PE);
1150 * tb_pci_port_enable() - Enable PCIe adapter port
1151 * @port: PCIe port to enable
1152 * @enable: Enable/disable the PCIe adapter
1154 int tb_pci_port_enable(struct tb_port *port, bool enable)
1156 u32 word = enable ? ADP_PCIE_CS_0_PE : 0x0;
1157 if (!port->cap_adap)
1159 return tb_port_write(port, &word, TB_CFG_PORT,
1160 port->cap_adap + ADP_PCIE_CS_0, 1);
1164 * tb_dp_port_hpd_is_active() - Is HPD already active
1165 * @port: DP out port to check
1167 * Checks if the DP OUT adapter port has HDP bit already set.
1169 int tb_dp_port_hpd_is_active(struct tb_port *port)
1174 ret = tb_port_read(port, &data, TB_CFG_PORT,
1175 port->cap_adap + ADP_DP_CS_2, 1);
1179 return !!(data & ADP_DP_CS_2_HDP);
1183 * tb_dp_port_hpd_clear() - Clear HPD from DP IN port
1184 * @port: Port to clear HPD
1186 * If the DP IN port has HDP set, this function can be used to clear it.
1188 int tb_dp_port_hpd_clear(struct tb_port *port)
1193 ret = tb_port_read(port, &data, TB_CFG_PORT,
1194 port->cap_adap + ADP_DP_CS_3, 1);
1198 data |= ADP_DP_CS_3_HDPC;
1199 return tb_port_write(port, &data, TB_CFG_PORT,
1200 port->cap_adap + ADP_DP_CS_3, 1);
1204 * tb_dp_port_set_hops() - Set video/aux Hop IDs for DP port
1205 * @port: DP IN/OUT port to set hops
1206 * @video: Video Hop ID
1207 * @aux_tx: AUX TX Hop ID
1208 * @aux_rx: AUX RX Hop ID
1210 * Programs specified Hop IDs for DP IN/OUT port.
1212 int tb_dp_port_set_hops(struct tb_port *port, unsigned int video,
1213 unsigned int aux_tx, unsigned int aux_rx)
1218 ret = tb_port_read(port, data, TB_CFG_PORT,
1219 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
1223 data[0] &= ~ADP_DP_CS_0_VIDEO_HOPID_MASK;
1224 data[1] &= ~ADP_DP_CS_1_AUX_RX_HOPID_MASK;
1225 data[1] &= ~ADP_DP_CS_1_AUX_RX_HOPID_MASK;
1227 data[0] |= (video << ADP_DP_CS_0_VIDEO_HOPID_SHIFT) &
1228 ADP_DP_CS_0_VIDEO_HOPID_MASK;
1229 data[1] |= aux_tx & ADP_DP_CS_1_AUX_TX_HOPID_MASK;
1230 data[1] |= (aux_rx << ADP_DP_CS_1_AUX_RX_HOPID_SHIFT) &
1231 ADP_DP_CS_1_AUX_RX_HOPID_MASK;
1233 return tb_port_write(port, data, TB_CFG_PORT,
1234 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
1238 * tb_dp_port_is_enabled() - Is DP adapter port enabled
1239 * @port: DP adapter port to check
1241 bool tb_dp_port_is_enabled(struct tb_port *port)
1245 if (tb_port_read(port, data, TB_CFG_PORT, port->cap_adap + ADP_DP_CS_0,
1249 return !!(data[0] & (ADP_DP_CS_0_VE | ADP_DP_CS_0_AE));
1253 * tb_dp_port_enable() - Enables/disables DP paths of a port
1254 * @port: DP IN/OUT port
1255 * @enable: Enable/disable DP path
1257 * Once Hop IDs are programmed DP paths can be enabled or disabled by
1258 * calling this function.
1260 int tb_dp_port_enable(struct tb_port *port, bool enable)
1265 ret = tb_port_read(port, data, TB_CFG_PORT,
1266 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
1271 data[0] |= ADP_DP_CS_0_VE | ADP_DP_CS_0_AE;
1273 data[0] &= ~(ADP_DP_CS_0_VE | ADP_DP_CS_0_AE);
1275 return tb_port_write(port, data, TB_CFG_PORT,
1276 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
1279 /* switch utility functions */
1281 static const char *tb_switch_generation_name(const struct tb_switch *sw)
1283 switch (sw->generation) {
1285 return "Thunderbolt 1";
1287 return "Thunderbolt 2";
1289 return "Thunderbolt 3";
1297 static void tb_dump_switch(const struct tb *tb, const struct tb_switch *sw)
1299 const struct tb_regs_switch_header *regs = &sw->config;
1301 tb_dbg(tb, " %s Switch: %x:%x (Revision: %d, TB Version: %d)\n",
1302 tb_switch_generation_name(sw), regs->vendor_id, regs->device_id,
1303 regs->revision, regs->thunderbolt_version);
1304 tb_dbg(tb, " Max Port Number: %d\n", regs->max_port_number);
1305 tb_dbg(tb, " Config:\n");
1307 " Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n",
1308 regs->upstream_port_number, regs->depth,
1309 (((u64) regs->route_hi) << 32) | regs->route_lo,
1310 regs->enabled, regs->plug_events_delay);
1311 tb_dbg(tb, " unknown1: %#x unknown4: %#x\n",
1312 regs->__unknown1, regs->__unknown4);
1316 * tb_switch_reset() - reconfigure route, enable and send TB_CFG_PKG_RESET
1317 * @sw: Switch to reset
1319 * Return: Returns 0 on success or an error code on failure.
1321 int tb_switch_reset(struct tb_switch *sw)
1323 struct tb_cfg_result res;
1325 if (sw->generation > 1)
1328 tb_sw_dbg(sw, "resetting switch\n");
1330 res.err = tb_sw_write(sw, ((u32 *) &sw->config) + 2,
1331 TB_CFG_SWITCH, 2, 2);
1334 res = tb_cfg_reset(sw->tb->ctl, tb_route(sw), TB_CFG_DEFAULT_TIMEOUT);
1341 * tb_plug_events_active() - enable/disable plug events on a switch
1343 * Also configures a sane plug_events_delay of 255ms.
1345 * Return: Returns 0 on success or an error code on failure.
1347 static int tb_plug_events_active(struct tb_switch *sw, bool active)
1352 if (tb_switch_is_icm(sw) || tb_switch_is_usb4(sw))
1355 sw->config.plug_events_delay = 0xff;
1356 res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1);
1360 res = tb_sw_read(sw, &data, TB_CFG_SWITCH, sw->cap_plug_events + 1, 1);
1365 data = data & 0xFFFFFF83;
1366 switch (sw->config.device_id) {
1367 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
1368 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
1369 case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
1377 return tb_sw_write(sw, &data, TB_CFG_SWITCH,
1378 sw->cap_plug_events + 1, 1);
1381 static ssize_t authorized_show(struct device *dev,
1382 struct device_attribute *attr,
1385 struct tb_switch *sw = tb_to_switch(dev);
1387 return sprintf(buf, "%u\n", sw->authorized);
1390 static int disapprove_switch(struct device *dev, void *not_used)
1392 struct tb_switch *sw;
1394 sw = tb_to_switch(dev);
1395 if (sw && sw->authorized) {
1398 /* First children */
1399 ret = device_for_each_child_reverse(&sw->dev, NULL, disapprove_switch);
1403 ret = tb_domain_disapprove_switch(sw->tb, sw);
1408 kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE);
1414 static int tb_switch_set_authorized(struct tb_switch *sw, unsigned int val)
1418 if (!mutex_trylock(&sw->tb->lock))
1419 return restart_syscall();
1421 if (!!sw->authorized == !!val)
1425 /* Disapprove switch */
1428 ret = disapprove_switch(&sw->dev, NULL);
1433 /* Approve switch */
1436 ret = tb_domain_approve_switch_key(sw->tb, sw);
1438 ret = tb_domain_approve_switch(sw->tb, sw);
1441 /* Challenge switch */
1444 ret = tb_domain_challenge_switch_key(sw->tb, sw);
1452 sw->authorized = val;
1453 /* Notify status change to the userspace */
1454 kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE);
1458 mutex_unlock(&sw->tb->lock);
1462 static ssize_t authorized_store(struct device *dev,
1463 struct device_attribute *attr,
1464 const char *buf, size_t count)
1466 struct tb_switch *sw = tb_to_switch(dev);
1470 ret = kstrtouint(buf, 0, &val);
1476 pm_runtime_get_sync(&sw->dev);
1477 ret = tb_switch_set_authorized(sw, val);
1478 pm_runtime_mark_last_busy(&sw->dev);
1479 pm_runtime_put_autosuspend(&sw->dev);
1481 return ret ? ret : count;
1483 static DEVICE_ATTR_RW(authorized);
1485 static ssize_t boot_show(struct device *dev, struct device_attribute *attr,
1488 struct tb_switch *sw = tb_to_switch(dev);
1490 return sprintf(buf, "%u\n", sw->boot);
1492 static DEVICE_ATTR_RO(boot);
1494 static ssize_t device_show(struct device *dev, struct device_attribute *attr,
1497 struct tb_switch *sw = tb_to_switch(dev);
1499 return sprintf(buf, "%#x\n", sw->device);
1501 static DEVICE_ATTR_RO(device);
1504 device_name_show(struct device *dev, struct device_attribute *attr, char *buf)
1506 struct tb_switch *sw = tb_to_switch(dev);
1508 return sprintf(buf, "%s\n", sw->device_name ? sw->device_name : "");
1510 static DEVICE_ATTR_RO(device_name);
1513 generation_show(struct device *dev, struct device_attribute *attr, char *buf)
1515 struct tb_switch *sw = tb_to_switch(dev);
1517 return sprintf(buf, "%u\n", sw->generation);
1519 static DEVICE_ATTR_RO(generation);
1521 static ssize_t key_show(struct device *dev, struct device_attribute *attr,
1524 struct tb_switch *sw = tb_to_switch(dev);
1527 if (!mutex_trylock(&sw->tb->lock))
1528 return restart_syscall();
1531 ret = sprintf(buf, "%*phN\n", TB_SWITCH_KEY_SIZE, sw->key);
1533 ret = sprintf(buf, "\n");
1535 mutex_unlock(&sw->tb->lock);
1539 static ssize_t key_store(struct device *dev, struct device_attribute *attr,
1540 const char *buf, size_t count)
1542 struct tb_switch *sw = tb_to_switch(dev);
1543 u8 key[TB_SWITCH_KEY_SIZE];
1544 ssize_t ret = count;
1547 if (!strcmp(buf, "\n"))
1549 else if (hex2bin(key, buf, sizeof(key)))
1552 if (!mutex_trylock(&sw->tb->lock))
1553 return restart_syscall();
1555 if (sw->authorized) {
1562 sw->key = kmemdup(key, sizeof(key), GFP_KERNEL);
1568 mutex_unlock(&sw->tb->lock);
1571 static DEVICE_ATTR(key, 0600, key_show, key_store);
1573 static ssize_t speed_show(struct device *dev, struct device_attribute *attr,
1576 struct tb_switch *sw = tb_to_switch(dev);
1578 return sprintf(buf, "%u.0 Gb/s\n", sw->link_speed);
1582 * Currently all lanes must run at the same speed but we expose here
1583 * both directions to allow possible asymmetric links in the future.
1585 static DEVICE_ATTR(rx_speed, 0444, speed_show, NULL);
1586 static DEVICE_ATTR(tx_speed, 0444, speed_show, NULL);
1588 static ssize_t lanes_show(struct device *dev, struct device_attribute *attr,
1591 struct tb_switch *sw = tb_to_switch(dev);
1593 return sprintf(buf, "%u\n", sw->link_width);
1597 * Currently link has same amount of lanes both directions (1 or 2) but
1598 * expose them separately to allow possible asymmetric links in the future.
1600 static DEVICE_ATTR(rx_lanes, 0444, lanes_show, NULL);
1601 static DEVICE_ATTR(tx_lanes, 0444, lanes_show, NULL);
1603 static ssize_t nvm_authenticate_show(struct device *dev,
1604 struct device_attribute *attr, char *buf)
1606 struct tb_switch *sw = tb_to_switch(dev);
1609 nvm_get_auth_status(sw, &status);
1610 return sprintf(buf, "%#x\n", status);
1613 static ssize_t nvm_authenticate_sysfs(struct device *dev, const char *buf,
1616 struct tb_switch *sw = tb_to_switch(dev);
1620 pm_runtime_get_sync(&sw->dev);
1622 if (!mutex_trylock(&sw->tb->lock)) {
1623 ret = restart_syscall();
1627 /* If NVMem devices are not yet added */
1633 ret = kstrtoint(buf, 10, &val);
1637 /* Always clear the authentication status */
1638 nvm_clear_auth_status(sw);
1641 if (!sw->nvm->flushed) {
1642 if (!sw->nvm->buf) {
1647 ret = nvm_validate_and_write(sw);
1648 if (ret || val == WRITE_ONLY)
1651 if (val == WRITE_AND_AUTHENTICATE) {
1653 ret = tb_lc_force_power(sw);
1655 sw->nvm->authenticating = true;
1656 ret = nvm_authenticate(sw);
1662 mutex_unlock(&sw->tb->lock);
1664 pm_runtime_mark_last_busy(&sw->dev);
1665 pm_runtime_put_autosuspend(&sw->dev);
1670 static ssize_t nvm_authenticate_store(struct device *dev,
1671 struct device_attribute *attr, const char *buf, size_t count)
1673 int ret = nvm_authenticate_sysfs(dev, buf, false);
1678 static DEVICE_ATTR_RW(nvm_authenticate);
1680 static ssize_t nvm_authenticate_on_disconnect_show(struct device *dev,
1681 struct device_attribute *attr, char *buf)
1683 return nvm_authenticate_show(dev, attr, buf);
1686 static ssize_t nvm_authenticate_on_disconnect_store(struct device *dev,
1687 struct device_attribute *attr, const char *buf, size_t count)
1691 ret = nvm_authenticate_sysfs(dev, buf, true);
1692 return ret ? ret : count;
1694 static DEVICE_ATTR_RW(nvm_authenticate_on_disconnect);
1696 static ssize_t nvm_version_show(struct device *dev,
1697 struct device_attribute *attr, char *buf)
1699 struct tb_switch *sw = tb_to_switch(dev);
1702 if (!mutex_trylock(&sw->tb->lock))
1703 return restart_syscall();
1710 ret = sprintf(buf, "%x.%x\n", sw->nvm->major, sw->nvm->minor);
1712 mutex_unlock(&sw->tb->lock);
1716 static DEVICE_ATTR_RO(nvm_version);
1718 static ssize_t vendor_show(struct device *dev, struct device_attribute *attr,
1721 struct tb_switch *sw = tb_to_switch(dev);
1723 return sprintf(buf, "%#x\n", sw->vendor);
1725 static DEVICE_ATTR_RO(vendor);
1728 vendor_name_show(struct device *dev, struct device_attribute *attr, char *buf)
1730 struct tb_switch *sw = tb_to_switch(dev);
1732 return sprintf(buf, "%s\n", sw->vendor_name ? sw->vendor_name : "");
1734 static DEVICE_ATTR_RO(vendor_name);
1736 static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr,
1739 struct tb_switch *sw = tb_to_switch(dev);
1741 return sprintf(buf, "%pUb\n", sw->uuid);
1743 static DEVICE_ATTR_RO(unique_id);
1745 static struct attribute *switch_attrs[] = {
1746 &dev_attr_authorized.attr,
1747 &dev_attr_boot.attr,
1748 &dev_attr_device.attr,
1749 &dev_attr_device_name.attr,
1750 &dev_attr_generation.attr,
1752 &dev_attr_nvm_authenticate.attr,
1753 &dev_attr_nvm_authenticate_on_disconnect.attr,
1754 &dev_attr_nvm_version.attr,
1755 &dev_attr_rx_speed.attr,
1756 &dev_attr_rx_lanes.attr,
1757 &dev_attr_tx_speed.attr,
1758 &dev_attr_tx_lanes.attr,
1759 &dev_attr_vendor.attr,
1760 &dev_attr_vendor_name.attr,
1761 &dev_attr_unique_id.attr,
1765 static umode_t switch_attr_is_visible(struct kobject *kobj,
1766 struct attribute *attr, int n)
1768 struct device *dev = kobj_to_dev(kobj);
1769 struct tb_switch *sw = tb_to_switch(dev);
1771 if (attr == &dev_attr_authorized.attr) {
1772 if (sw->tb->security_level == TB_SECURITY_NOPCIE ||
1773 sw->tb->security_level == TB_SECURITY_DPONLY)
1775 } else if (attr == &dev_attr_device.attr) {
1778 } else if (attr == &dev_attr_device_name.attr) {
1779 if (!sw->device_name)
1781 } else if (attr == &dev_attr_vendor.attr) {
1784 } else if (attr == &dev_attr_vendor_name.attr) {
1785 if (!sw->vendor_name)
1787 } else if (attr == &dev_attr_key.attr) {
1789 sw->tb->security_level == TB_SECURITY_SECURE &&
1790 sw->security_level == TB_SECURITY_SECURE)
1793 } else if (attr == &dev_attr_rx_speed.attr ||
1794 attr == &dev_attr_rx_lanes.attr ||
1795 attr == &dev_attr_tx_speed.attr ||
1796 attr == &dev_attr_tx_lanes.attr) {
1800 } else if (attr == &dev_attr_nvm_authenticate.attr) {
1801 if (nvm_upgradeable(sw))
1804 } else if (attr == &dev_attr_nvm_version.attr) {
1805 if (nvm_readable(sw))
1808 } else if (attr == &dev_attr_boot.attr) {
1812 } else if (attr == &dev_attr_nvm_authenticate_on_disconnect.attr) {
1813 if (sw->quirks & QUIRK_FORCE_POWER_LINK_CONTROLLER)
1818 return sw->safe_mode ? 0 : attr->mode;
1821 static const struct attribute_group switch_group = {
1822 .is_visible = switch_attr_is_visible,
1823 .attrs = switch_attrs,
1826 static const struct attribute_group *switch_groups[] = {
1831 static void tb_switch_release(struct device *dev)
1833 struct tb_switch *sw = tb_to_switch(dev);
1834 struct tb_port *port;
1836 dma_port_free(sw->dma_port);
1838 tb_switch_for_each_port(sw, port) {
1839 ida_destroy(&port->in_hopids);
1840 ida_destroy(&port->out_hopids);
1844 kfree(sw->device_name);
1845 kfree(sw->vendor_name);
1853 * Currently only need to provide the callbacks. Everything else is handled
1854 * in the connection manager.
1856 static int __maybe_unused tb_switch_runtime_suspend(struct device *dev)
1858 struct tb_switch *sw = tb_to_switch(dev);
1859 const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
1861 if (cm_ops->runtime_suspend_switch)
1862 return cm_ops->runtime_suspend_switch(sw);
1867 static int __maybe_unused tb_switch_runtime_resume(struct device *dev)
1869 struct tb_switch *sw = tb_to_switch(dev);
1870 const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
1872 if (cm_ops->runtime_resume_switch)
1873 return cm_ops->runtime_resume_switch(sw);
1877 static const struct dev_pm_ops tb_switch_pm_ops = {
1878 SET_RUNTIME_PM_OPS(tb_switch_runtime_suspend, tb_switch_runtime_resume,
1882 struct device_type tb_switch_type = {
1883 .name = "thunderbolt_device",
1884 .release = tb_switch_release,
1885 .pm = &tb_switch_pm_ops,
1888 static int tb_switch_get_generation(struct tb_switch *sw)
1890 switch (sw->config.device_id) {
1891 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
1892 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
1893 case PCI_DEVICE_ID_INTEL_LIGHT_PEAK:
1894 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_2C:
1895 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C:
1896 case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
1897 case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_2C_BRIDGE:
1898 case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_4C_BRIDGE:
1901 case PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_BRIDGE:
1902 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE:
1903 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE:
1906 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE:
1907 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_BRIDGE:
1908 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_BRIDGE:
1909 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE:
1910 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE:
1911 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_BRIDGE:
1912 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_BRIDGE:
1913 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_BRIDGE:
1914 case PCI_DEVICE_ID_INTEL_ICL_NHI0:
1915 case PCI_DEVICE_ID_INTEL_ICL_NHI1:
1919 if (tb_switch_is_usb4(sw))
1923 * For unknown switches assume generation to be 1 to be
1926 tb_sw_warn(sw, "unsupported switch device id %#x\n",
1927 sw->config.device_id);
1932 static bool tb_switch_exceeds_max_depth(const struct tb_switch *sw, int depth)
1936 if (tb_switch_is_usb4(sw) ||
1937 (sw->tb->root_switch && tb_switch_is_usb4(sw->tb->root_switch)))
1938 max_depth = USB4_SWITCH_MAX_DEPTH;
1940 max_depth = TB_SWITCH_MAX_DEPTH;
1942 return depth > max_depth;
1946 * tb_switch_alloc() - allocate a switch
1947 * @tb: Pointer to the owning domain
1948 * @parent: Parent device for this switch
1949 * @route: Route string for this switch
1951 * Allocates and initializes a switch. Will not upload configuration to
1952 * the switch. For that you need to call tb_switch_configure()
1953 * separately. The returned switch should be released by calling
1956 * Return: Pointer to the allocated switch or ERR_PTR() in case of
1959 struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,
1962 struct tb_switch *sw;
1966 /* Unlock the downstream port so we can access the switch below */
1968 struct tb_switch *parent_sw = tb_to_switch(parent);
1969 struct tb_port *down;
1971 down = tb_port_at(route, parent_sw);
1972 tb_port_unlock(down);
1975 depth = tb_route_length(route);
1977 upstream_port = tb_cfg_get_upstream_port(tb->ctl, route);
1978 if (upstream_port < 0)
1979 return ERR_PTR(upstream_port);
1981 sw = kzalloc(sizeof(*sw), GFP_KERNEL);
1983 return ERR_PTR(-ENOMEM);
1986 ret = tb_cfg_read(tb->ctl, &sw->config, route, 0, TB_CFG_SWITCH, 0, 5);
1988 goto err_free_sw_ports;
1990 sw->generation = tb_switch_get_generation(sw);
1992 tb_dbg(tb, "current switch config:\n");
1993 tb_dump_switch(tb, sw);
1995 /* configure switch */
1996 sw->config.upstream_port_number = upstream_port;
1997 sw->config.depth = depth;
1998 sw->config.route_hi = upper_32_bits(route);
1999 sw->config.route_lo = lower_32_bits(route);
2000 sw->config.enabled = 0;
2002 /* Make sure we do not exceed maximum topology limit */
2003 if (tb_switch_exceeds_max_depth(sw, depth)) {
2004 ret = -EADDRNOTAVAIL;
2005 goto err_free_sw_ports;
2008 /* initialize ports */
2009 sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports),
2013 goto err_free_sw_ports;
2016 for (i = 0; i <= sw->config.max_port_number; i++) {
2017 /* minimum setup for tb_find_cap and tb_drom_read to work */
2018 sw->ports[i].sw = sw;
2019 sw->ports[i].port = i;
2021 /* Control port does not need HopID allocation */
2023 ida_init(&sw->ports[i].in_hopids);
2024 ida_init(&sw->ports[i].out_hopids);
2028 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_PLUG_EVENTS);
2030 sw->cap_plug_events = ret;
2032 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_LINK_CONTROLLER);
2036 /* Root switch is always authorized */
2038 sw->authorized = true;
2040 device_initialize(&sw->dev);
2041 sw->dev.parent = parent;
2042 sw->dev.bus = &tb_bus_type;
2043 sw->dev.type = &tb_switch_type;
2044 sw->dev.groups = switch_groups;
2045 dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
2053 return ERR_PTR(ret);
2057 * tb_switch_alloc_safe_mode() - allocate a switch that is in safe mode
2058 * @tb: Pointer to the owning domain
2059 * @parent: Parent device for this switch
2060 * @route: Route string for this switch
2062 * This creates a switch in safe mode. This means the switch pretty much
2063 * lacks all capabilities except DMA configuration port before it is
2064 * flashed with a valid NVM firmware.
2066 * The returned switch must be released by calling tb_switch_put().
2068 * Return: Pointer to the allocated switch or ERR_PTR() in case of failure
2071 tb_switch_alloc_safe_mode(struct tb *tb, struct device *parent, u64 route)
2073 struct tb_switch *sw;
2075 sw = kzalloc(sizeof(*sw), GFP_KERNEL);
2077 return ERR_PTR(-ENOMEM);
2080 sw->config.depth = tb_route_length(route);
2081 sw->config.route_hi = upper_32_bits(route);
2082 sw->config.route_lo = lower_32_bits(route);
2083 sw->safe_mode = true;
2085 device_initialize(&sw->dev);
2086 sw->dev.parent = parent;
2087 sw->dev.bus = &tb_bus_type;
2088 sw->dev.type = &tb_switch_type;
2089 sw->dev.groups = switch_groups;
2090 dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
2096 * tb_switch_configure() - Uploads configuration to the switch
2097 * @sw: Switch to configure
2099 * Call this function before the switch is added to the system. It will
2100 * upload configuration to the switch and makes it available for the
2101 * connection manager to use. Can be called to the switch again after
2102 * resume from low power states to re-initialize it.
2104 * Return: %0 in case of success and negative errno in case of failure
2106 int tb_switch_configure(struct tb_switch *sw)
2108 struct tb *tb = sw->tb;
2112 route = tb_route(sw);
2114 tb_dbg(tb, "%s Switch at %#llx (depth: %d, up port: %d)\n",
2115 sw->config.enabled ? "restoring" : "initializing", route,
2116 tb_route_length(route), sw->config.upstream_port_number);
2118 sw->config.enabled = 1;
2120 if (tb_switch_is_usb4(sw)) {
2122 * For USB4 devices, we need to program the CM version
2123 * accordingly so that it knows to expose all the
2124 * additional capabilities.
2126 sw->config.cmuv = USB4_VERSION_1_0;
2128 /* Enumerate the switch */
2129 ret = tb_sw_write(sw, (u32 *)&sw->config + 1, TB_CFG_SWITCH,
2134 ret = usb4_switch_setup(sw);
2136 if (sw->config.vendor_id != PCI_VENDOR_ID_INTEL)
2137 tb_sw_warn(sw, "unknown switch vendor id %#x\n",
2138 sw->config.vendor_id);
2140 if (!sw->cap_plug_events) {
2141 tb_sw_warn(sw, "cannot find TB_VSE_CAP_PLUG_EVENTS aborting\n");
2145 /* Enumerate the switch */
2146 ret = tb_sw_write(sw, (u32 *)&sw->config + 1, TB_CFG_SWITCH,
2152 return tb_plug_events_active(sw, true);
2155 static int tb_switch_set_uuid(struct tb_switch *sw)
2164 if (tb_switch_is_usb4(sw)) {
2165 ret = usb4_switch_read_uid(sw, &sw->uid);
2171 * The newer controllers include fused UUID as part of
2172 * link controller specific registers
2174 ret = tb_lc_read_uuid(sw, uuid);
2184 * ICM generates UUID based on UID and fills the upper
2185 * two words with ones. This is not strictly following
2186 * UUID format but we want to be compatible with it so
2187 * we do the same here.
2189 uuid[0] = sw->uid & 0xffffffff;
2190 uuid[1] = (sw->uid >> 32) & 0xffffffff;
2191 uuid[2] = 0xffffffff;
2192 uuid[3] = 0xffffffff;
2195 sw->uuid = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
2201 static int tb_switch_add_dma_port(struct tb_switch *sw)
2206 switch (sw->generation) {
2208 /* Only root switch can be upgraded */
2215 ret = tb_switch_set_uuid(sw);
2222 * DMA port is the only thing available when the switch
2230 if (sw->no_nvm_upgrade)
2233 if (tb_switch_is_usb4(sw)) {
2234 ret = usb4_switch_nvm_authenticate_status(sw, &status);
2239 tb_sw_info(sw, "switch flash authentication failed\n");
2240 nvm_set_auth_status(sw, status);
2246 /* Root switch DMA port requires running firmware */
2247 if (!tb_route(sw) && !tb_switch_is_icm(sw))
2250 sw->dma_port = dma_port_alloc(sw);
2255 * If there is status already set then authentication failed
2256 * when the dma_port_flash_update_auth() returned. Power cycling
2257 * is not needed (it was done already) so only thing we do here
2258 * is to unblock runtime PM of the root port.
2260 nvm_get_auth_status(sw, &status);
2263 nvm_authenticate_complete_dma_port(sw);
2268 * Check status of the previous flash authentication. If there
2269 * is one we need to power cycle the switch in any case to make
2270 * it functional again.
2272 ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
2276 /* Now we can allow root port to suspend again */
2278 nvm_authenticate_complete_dma_port(sw);
2281 tb_sw_info(sw, "switch flash authentication failed\n");
2282 nvm_set_auth_status(sw, status);
2285 tb_sw_info(sw, "power cycling the switch now\n");
2286 dma_port_power_cycle(sw->dma_port);
2289 * We return error here which causes the switch adding failure.
2290 * It should appear back after power cycle is complete.
2295 static void tb_switch_default_link_ports(struct tb_switch *sw)
2299 for (i = 1; i <= sw->config.max_port_number; i += 2) {
2300 struct tb_port *port = &sw->ports[i];
2301 struct tb_port *subordinate;
2303 if (!tb_port_is_null(port))
2306 /* Check for the subordinate port */
2307 if (i == sw->config.max_port_number ||
2308 !tb_port_is_null(&sw->ports[i + 1]))
2311 /* Link them if not already done so (by DROM) */
2312 subordinate = &sw->ports[i + 1];
2313 if (!port->dual_link_port && !subordinate->dual_link_port) {
2315 port->dual_link_port = subordinate;
2316 subordinate->link_nr = 1;
2317 subordinate->dual_link_port = port;
2319 tb_sw_dbg(sw, "linked ports %d <-> %d\n",
2320 port->port, subordinate->port);
2325 static bool tb_switch_lane_bonding_possible(struct tb_switch *sw)
2327 const struct tb_port *up = tb_upstream_port(sw);
2329 if (!up->dual_link_port || !up->dual_link_port->remote)
2332 if (tb_switch_is_usb4(sw))
2333 return usb4_switch_lane_bonding_possible(sw);
2334 return tb_lc_lane_bonding_possible(sw);
2337 static int tb_switch_update_link_attributes(struct tb_switch *sw)
2340 bool change = false;
2343 if (!tb_route(sw) || tb_switch_is_icm(sw))
2346 up = tb_upstream_port(sw);
2348 ret = tb_port_get_link_speed(up);
2351 if (sw->link_speed != ret)
2353 sw->link_speed = ret;
2355 ret = tb_port_get_link_width(up);
2358 if (sw->link_width != ret)
2360 sw->link_width = ret;
2362 /* Notify userspace that there is possible link attribute change */
2363 if (device_is_registered(&sw->dev) && change)
2364 kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE);
2370 * tb_switch_lane_bonding_enable() - Enable lane bonding
2371 * @sw: Switch to enable lane bonding
2373 * Connection manager can call this function to enable lane bonding of a
2374 * switch. If conditions are correct and both switches support the feature,
2375 * lanes are bonded. It is safe to call this to any switch.
2377 int tb_switch_lane_bonding_enable(struct tb_switch *sw)
2379 struct tb_switch *parent = tb_to_switch(sw->dev.parent);
2380 struct tb_port *up, *down;
2381 u64 route = tb_route(sw);
2387 if (!tb_switch_lane_bonding_possible(sw))
2390 up = tb_upstream_port(sw);
2391 down = tb_port_at(route, parent);
2393 if (!tb_port_is_width_supported(up, 2) ||
2394 !tb_port_is_width_supported(down, 2))
2397 ret = tb_port_lane_bonding_enable(up);
2399 tb_port_warn(up, "failed to enable lane bonding\n");
2403 ret = tb_port_lane_bonding_enable(down);
2405 tb_port_warn(down, "failed to enable lane bonding\n");
2406 tb_port_lane_bonding_disable(up);
2410 tb_switch_update_link_attributes(sw);
2412 tb_sw_dbg(sw, "lane bonding enabled\n");
2417 * tb_switch_lane_bonding_disable() - Disable lane bonding
2418 * @sw: Switch whose lane bonding to disable
2420 * Disables lane bonding between @sw and parent. This can be called even
2421 * if lanes were not bonded originally.
2423 void tb_switch_lane_bonding_disable(struct tb_switch *sw)
2425 struct tb_switch *parent = tb_to_switch(sw->dev.parent);
2426 struct tb_port *up, *down;
2431 up = tb_upstream_port(sw);
2435 down = tb_port_at(tb_route(sw), parent);
2437 tb_port_lane_bonding_disable(up);
2438 tb_port_lane_bonding_disable(down);
2440 tb_switch_update_link_attributes(sw);
2441 tb_sw_dbg(sw, "lane bonding disabled\n");
2445 * tb_switch_configure_link() - Set link configured
2446 * @sw: Switch whose link is configured
2448 * Sets the link upstream from @sw configured (from both ends) so that
2449 * it will not be disconnected when the domain exits sleep. Can be
2450 * called for any switch.
2452 * It is recommended that this is called after lane bonding is enabled.
2454 * Returns %0 on success and negative errno in case of error.
2456 int tb_switch_configure_link(struct tb_switch *sw)
2458 struct tb_port *up, *down;
2461 if (!tb_route(sw) || tb_switch_is_icm(sw))
2464 up = tb_upstream_port(sw);
2465 if (tb_switch_is_usb4(up->sw))
2466 ret = usb4_port_configure(up);
2468 ret = tb_lc_configure_port(up);
2473 if (tb_switch_is_usb4(down->sw))
2474 return usb4_port_configure(down);
2475 return tb_lc_configure_port(down);
2479 * tb_switch_unconfigure_link() - Unconfigure link
2480 * @sw: Switch whose link is unconfigured
2482 * Sets the link unconfigured so the @sw will be disconnected if the
2483 * domain exists sleep.
2485 void tb_switch_unconfigure_link(struct tb_switch *sw)
2487 struct tb_port *up, *down;
2489 if (sw->is_unplugged)
2491 if (!tb_route(sw) || tb_switch_is_icm(sw))
2494 up = tb_upstream_port(sw);
2495 if (tb_switch_is_usb4(up->sw))
2496 usb4_port_unconfigure(up);
2498 tb_lc_unconfigure_port(up);
2501 if (tb_switch_is_usb4(down->sw))
2502 usb4_port_unconfigure(down);
2504 tb_lc_unconfigure_port(down);
2508 * tb_switch_add() - Add a switch to the domain
2509 * @sw: Switch to add
2511 * This is the last step in adding switch to the domain. It will read
2512 * identification information from DROM and initializes ports so that
2513 * they can be used to connect other switches. The switch will be
2514 * exposed to the userspace when this function successfully returns. To
2515 * remove and release the switch, call tb_switch_remove().
2517 * Return: %0 in case of success and negative errno in case of failure
2519 int tb_switch_add(struct tb_switch *sw)
2524 * Initialize DMA control port now before we read DROM. Recent
2525 * host controllers have more complete DROM on NVM that includes
2526 * vendor and model identification strings which we then expose
2527 * to the userspace. NVM can be accessed through DMA
2528 * configuration based mailbox.
2530 ret = tb_switch_add_dma_port(sw);
2532 dev_err(&sw->dev, "failed to add DMA port\n");
2536 if (!sw->safe_mode) {
2538 ret = tb_drom_read(sw);
2540 dev_err(&sw->dev, "reading DROM failed\n");
2543 tb_sw_dbg(sw, "uid: %#llx\n", sw->uid);
2545 ret = tb_switch_set_uuid(sw);
2547 dev_err(&sw->dev, "failed to set UUID\n");
2551 for (i = 0; i <= sw->config.max_port_number; i++) {
2552 if (sw->ports[i].disabled) {
2553 tb_port_dbg(&sw->ports[i], "disabled by eeprom\n");
2556 ret = tb_init_port(&sw->ports[i]);
2558 dev_err(&sw->dev, "failed to initialize port %d\n", i);
2563 tb_switch_default_link_ports(sw);
2565 ret = tb_switch_update_link_attributes(sw);
2569 ret = tb_switch_tmu_init(sw);
2574 ret = device_add(&sw->dev);
2576 dev_err(&sw->dev, "failed to add device: %d\n", ret);
2581 dev_info(&sw->dev, "new device found, vendor=%#x device=%#x\n",
2582 sw->vendor, sw->device);
2583 if (sw->vendor_name && sw->device_name)
2584 dev_info(&sw->dev, "%s %s\n", sw->vendor_name,
2588 ret = tb_switch_nvm_add(sw);
2590 dev_err(&sw->dev, "failed to add NVM devices\n");
2591 device_del(&sw->dev);
2596 * Thunderbolt routers do not generate wakeups themselves but
2597 * they forward wakeups from tunneled protocols, so enable it
2600 device_init_wakeup(&sw->dev, true);
2602 pm_runtime_set_active(&sw->dev);
2604 pm_runtime_set_autosuspend_delay(&sw->dev, TB_AUTOSUSPEND_DELAY);
2605 pm_runtime_use_autosuspend(&sw->dev);
2606 pm_runtime_mark_last_busy(&sw->dev);
2607 pm_runtime_enable(&sw->dev);
2608 pm_request_autosuspend(&sw->dev);
2611 tb_switch_debugfs_init(sw);
2616 * tb_switch_remove() - Remove and release a switch
2617 * @sw: Switch to remove
2619 * This will remove the switch from the domain and release it after last
2620 * reference count drops to zero. If there are switches connected below
2621 * this switch, they will be removed as well.
2623 void tb_switch_remove(struct tb_switch *sw)
2625 struct tb_port *port;
2627 tb_switch_debugfs_remove(sw);
2630 pm_runtime_get_sync(&sw->dev);
2631 pm_runtime_disable(&sw->dev);
2634 /* port 0 is the switch itself and never has a remote */
2635 tb_switch_for_each_port(sw, port) {
2636 if (tb_port_has_remote(port)) {
2637 tb_switch_remove(port->remote->sw);
2638 port->remote = NULL;
2639 } else if (port->xdomain) {
2640 tb_xdomain_remove(port->xdomain);
2641 port->xdomain = NULL;
2644 /* Remove any downstream retimers */
2645 tb_retimer_remove_all(port);
2648 if (!sw->is_unplugged)
2649 tb_plug_events_active(sw, false);
2651 tb_switch_nvm_remove(sw);
2654 dev_info(&sw->dev, "device disconnected\n");
2655 device_unregister(&sw->dev);
2659 * tb_sw_set_unplugged() - set is_unplugged on switch and downstream switches
2660 * @sw: Router to mark unplugged
2662 void tb_sw_set_unplugged(struct tb_switch *sw)
2664 struct tb_port *port;
2666 if (sw == sw->tb->root_switch) {
2667 tb_sw_WARN(sw, "cannot unplug root switch\n");
2670 if (sw->is_unplugged) {
2671 tb_sw_WARN(sw, "is_unplugged already set\n");
2674 sw->is_unplugged = true;
2675 tb_switch_for_each_port(sw, port) {
2676 if (tb_port_has_remote(port))
2677 tb_sw_set_unplugged(port->remote->sw);
2678 else if (port->xdomain)
2679 port->xdomain->is_unplugged = true;
2683 static int tb_switch_set_wake(struct tb_switch *sw, unsigned int flags)
2686 tb_sw_dbg(sw, "enabling wakeup: %#x\n", flags);
2688 tb_sw_dbg(sw, "disabling wakeup\n");
2690 if (tb_switch_is_usb4(sw))
2691 return usb4_switch_set_wake(sw, flags);
2692 return tb_lc_set_wake(sw, flags);
2695 int tb_switch_resume(struct tb_switch *sw)
2697 struct tb_port *port;
2700 tb_sw_dbg(sw, "resuming switch\n");
2703 * Check for UID of the connected switches except for root
2704 * switch which we assume cannot be removed.
2710 * Check first that we can still read the switch config
2711 * space. It may be that there is now another domain
2714 err = tb_cfg_get_upstream_port(sw->tb->ctl, tb_route(sw));
2716 tb_sw_info(sw, "switch not present anymore\n");
2720 if (tb_switch_is_usb4(sw))
2721 err = usb4_switch_read_uid(sw, &uid);
2723 err = tb_drom_read_uid_only(sw, &uid);
2725 tb_sw_warn(sw, "uid read failed\n");
2728 if (sw->uid != uid) {
2730 "changed while suspended (uid %#llx -> %#llx)\n",
2736 err = tb_switch_configure(sw);
2741 tb_switch_set_wake(sw, 0);
2743 err = tb_switch_tmu_init(sw);
2747 /* check for surviving downstream switches */
2748 tb_switch_for_each_port(sw, port) {
2749 if (!tb_port_has_remote(port) && !port->xdomain) {
2751 * For disconnected downstream lane adapters
2752 * start lane initialization now so we detect
2755 if (!tb_is_upstream_port(port) && tb_port_is_null(port))
2756 tb_port_start_lane_initialization(port);
2758 } else if (port->xdomain) {
2760 * Start lane initialization for XDomain so the
2761 * link gets re-established.
2763 tb_port_start_lane_initialization(port);
2766 if (tb_wait_for_port(port, true) <= 0) {
2768 "lost during suspend, disconnecting\n");
2769 if (tb_port_has_remote(port))
2770 tb_sw_set_unplugged(port->remote->sw);
2771 else if (port->xdomain)
2772 port->xdomain->is_unplugged = true;
2773 } else if (tb_port_has_remote(port) || port->xdomain) {
2775 * Always unlock the port so the downstream
2776 * switch/domain is accessible.
2778 if (tb_port_unlock(port))
2779 tb_port_warn(port, "failed to unlock port\n");
2780 if (port->remote && tb_switch_resume(port->remote->sw)) {
2782 "lost during suspend, disconnecting\n");
2783 tb_sw_set_unplugged(port->remote->sw);
2791 * tb_switch_suspend() - Put a switch to sleep
2792 * @sw: Switch to suspend
2793 * @runtime: Is this runtime suspend or system sleep
2795 * Suspends router and all its children. Enables wakes according to
2796 * value of @runtime and then sets sleep bit for the router. If @sw is
2797 * host router the domain is ready to go to sleep once this function
2800 void tb_switch_suspend(struct tb_switch *sw, bool runtime)
2802 unsigned int flags = 0;
2803 struct tb_port *port;
2806 tb_sw_dbg(sw, "suspending switch\n");
2808 err = tb_plug_events_active(sw, false);
2812 tb_switch_for_each_port(sw, port) {
2813 if (tb_port_has_remote(port))
2814 tb_switch_suspend(port->remote->sw, runtime);
2818 /* Trigger wake when something is plugged in/out */
2819 flags |= TB_WAKE_ON_CONNECT | TB_WAKE_ON_DISCONNECT;
2820 flags |= TB_WAKE_ON_USB4 | TB_WAKE_ON_USB3 | TB_WAKE_ON_PCIE;
2821 } else if (device_may_wakeup(&sw->dev)) {
2822 flags |= TB_WAKE_ON_USB4 | TB_WAKE_ON_USB3 | TB_WAKE_ON_PCIE;
2825 tb_switch_set_wake(sw, flags);
2827 if (tb_switch_is_usb4(sw))
2828 usb4_switch_set_sleep(sw);
2830 tb_lc_set_sleep(sw);
2834 * tb_switch_query_dp_resource() - Query availability of DP resource
2835 * @sw: Switch whose DP resource is queried
2838 * Queries availability of DP resource for DP tunneling using switch
2839 * specific means. Returns %true if resource is available.
2841 bool tb_switch_query_dp_resource(struct tb_switch *sw, struct tb_port *in)
2843 if (tb_switch_is_usb4(sw))
2844 return usb4_switch_query_dp_resource(sw, in);
2845 return tb_lc_dp_sink_query(sw, in);
2849 * tb_switch_alloc_dp_resource() - Allocate available DP resource
2850 * @sw: Switch whose DP resource is allocated
2853 * Allocates DP resource for DP tunneling. The resource must be
2854 * available for this to succeed (see tb_switch_query_dp_resource()).
2855 * Returns %0 in success and negative errno otherwise.
2857 int tb_switch_alloc_dp_resource(struct tb_switch *sw, struct tb_port *in)
2859 if (tb_switch_is_usb4(sw))
2860 return usb4_switch_alloc_dp_resource(sw, in);
2861 return tb_lc_dp_sink_alloc(sw, in);
2865 * tb_switch_dealloc_dp_resource() - De-allocate DP resource
2866 * @sw: Switch whose DP resource is de-allocated
2869 * De-allocates DP resource that was previously allocated for DP
2872 void tb_switch_dealloc_dp_resource(struct tb_switch *sw, struct tb_port *in)
2876 if (tb_switch_is_usb4(sw))
2877 ret = usb4_switch_dealloc_dp_resource(sw, in);
2879 ret = tb_lc_dp_sink_dealloc(sw, in);
2882 tb_sw_warn(sw, "failed to de-allocate DP resource for port %d\n",
2886 struct tb_sw_lookup {
2894 static int tb_switch_match(struct device *dev, const void *data)
2896 struct tb_switch *sw = tb_to_switch(dev);
2897 const struct tb_sw_lookup *lookup = data;
2901 if (sw->tb != lookup->tb)
2905 return !memcmp(sw->uuid, lookup->uuid, sizeof(*lookup->uuid));
2907 if (lookup->route) {
2908 return sw->config.route_lo == lower_32_bits(lookup->route) &&
2909 sw->config.route_hi == upper_32_bits(lookup->route);
2912 /* Root switch is matched only by depth */
2916 return sw->link == lookup->link && sw->depth == lookup->depth;
2920 * tb_switch_find_by_link_depth() - Find switch by link and depth
2921 * @tb: Domain the switch belongs
2922 * @link: Link number the switch is connected
2923 * @depth: Depth of the switch in link
2925 * Returned switch has reference count increased so the caller needs to
2926 * call tb_switch_put() when done with the switch.
2928 struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link, u8 depth)
2930 struct tb_sw_lookup lookup;
2933 memset(&lookup, 0, sizeof(lookup));
2936 lookup.depth = depth;
2938 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
2940 return tb_to_switch(dev);
2946 * tb_switch_find_by_uuid() - Find switch by UUID
2947 * @tb: Domain the switch belongs
2948 * @uuid: UUID to look for
2950 * Returned switch has reference count increased so the caller needs to
2951 * call tb_switch_put() when done with the switch.
2953 struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_t *uuid)
2955 struct tb_sw_lookup lookup;
2958 memset(&lookup, 0, sizeof(lookup));
2962 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
2964 return tb_to_switch(dev);
2970 * tb_switch_find_by_route() - Find switch by route string
2971 * @tb: Domain the switch belongs
2972 * @route: Route string to look for
2974 * Returned switch has reference count increased so the caller needs to
2975 * call tb_switch_put() when done with the switch.
2977 struct tb_switch *tb_switch_find_by_route(struct tb *tb, u64 route)
2979 struct tb_sw_lookup lookup;
2983 return tb_switch_get(tb->root_switch);
2985 memset(&lookup, 0, sizeof(lookup));
2987 lookup.route = route;
2989 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
2991 return tb_to_switch(dev);
2997 * tb_switch_find_port() - return the first port of @type on @sw or NULL
2998 * @sw: Switch to find the port from
2999 * @type: Port type to look for
3001 struct tb_port *tb_switch_find_port(struct tb_switch *sw,
3002 enum tb_port_type type)
3004 struct tb_port *port;
3006 tb_switch_for_each_port(sw, port) {
3007 if (port->config.type == type)