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
507 * The port must have a TB_CAP_PHY (i.e. it should be a real port).
509 * Return: Returns an enum tb_port_state on success or an error code on failure.
511 static int tb_port_state(struct tb_port *port)
513 struct tb_cap_phy phy;
515 if (port->cap_phy == 0) {
516 tb_port_WARN(port, "does not have a PHY\n");
519 res = tb_port_read(port, &phy, TB_CFG_PORT, port->cap_phy, 2);
526 * tb_wait_for_port() - wait for a port to become ready
528 * Wait up to 1 second for a port to reach state TB_PORT_UP. If
529 * wait_if_unplugged is set then we also wait if the port is in state
530 * TB_PORT_UNPLUGGED (it takes a while for the device to be registered after
531 * switch resume). Otherwise we only wait if a device is registered but the link
532 * has not yet been established.
534 * Return: Returns an error code on failure. Returns 0 if the port is not
535 * connected or failed to reach state TB_PORT_UP within one second. Returns 1
536 * if the port is connected and in state TB_PORT_UP.
538 int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged)
542 if (!port->cap_phy) {
543 tb_port_WARN(port, "does not have PHY\n");
546 if (tb_is_upstream_port(port)) {
547 tb_port_WARN(port, "is the upstream port\n");
552 state = tb_port_state(port);
555 if (state == TB_PORT_DISABLED) {
556 tb_port_dbg(port, "is disabled (state: 0)\n");
559 if (state == TB_PORT_UNPLUGGED) {
560 if (wait_if_unplugged) {
561 /* used during resume */
563 "is unplugged (state: 7), retrying...\n");
567 tb_port_dbg(port, "is unplugged (state: 7)\n");
570 if (state == TB_PORT_UP) {
571 tb_port_dbg(port, "is connected, link is up (state: 2)\n");
576 * After plug-in the state is TB_PORT_CONNECTING. Give it some
580 "is connected, link is not up (state: %d), retrying...\n",
585 "failed to reach state TB_PORT_UP. Ignoring port...\n");
590 * tb_port_add_nfc_credits() - add/remove non flow controlled credits to port
592 * Change the number of NFC credits allocated to @port by @credits. To remove
593 * NFC credits pass a negative amount of credits.
595 * Return: Returns 0 on success or an error code on failure.
597 int tb_port_add_nfc_credits(struct tb_port *port, int credits)
601 if (credits == 0 || port->sw->is_unplugged)
605 * USB4 restricts programming NFC buffers to lane adapters only
606 * so skip other ports.
608 if (tb_switch_is_usb4(port->sw) && !tb_port_is_null(port))
611 nfc_credits = port->config.nfc_credits & ADP_CS_4_NFC_BUFFERS_MASK;
612 nfc_credits += credits;
614 tb_port_dbg(port, "adding %d NFC credits to %lu", credits,
615 port->config.nfc_credits & ADP_CS_4_NFC_BUFFERS_MASK);
617 port->config.nfc_credits &= ~ADP_CS_4_NFC_BUFFERS_MASK;
618 port->config.nfc_credits |= nfc_credits;
620 return tb_port_write(port, &port->config.nfc_credits,
621 TB_CFG_PORT, ADP_CS_4, 1);
625 * tb_port_set_initial_credits() - Set initial port link credits allocated
626 * @port: Port to set the initial credits
627 * @credits: Number of credits to to allocate
629 * Set initial credits value to be used for ingress shared buffering.
631 int tb_port_set_initial_credits(struct tb_port *port, u32 credits)
636 ret = tb_port_read(port, &data, TB_CFG_PORT, ADP_CS_5, 1);
640 data &= ~ADP_CS_5_LCA_MASK;
641 data |= (credits << ADP_CS_5_LCA_SHIFT) & ADP_CS_5_LCA_MASK;
643 return tb_port_write(port, &data, TB_CFG_PORT, ADP_CS_5, 1);
647 * tb_port_clear_counter() - clear a counter in TB_CFG_COUNTER
649 * Return: Returns 0 on success or an error code on failure.
651 int tb_port_clear_counter(struct tb_port *port, int counter)
653 u32 zero[3] = { 0, 0, 0 };
654 tb_port_dbg(port, "clearing counter %d\n", counter);
655 return tb_port_write(port, zero, TB_CFG_COUNTERS, 3 * counter, 3);
659 * tb_port_unlock() - Unlock downstream port
660 * @port: Port to unlock
662 * Needed for USB4 but can be called for any CIO/USB4 ports. Makes the
663 * downstream router accessible for CM.
665 int tb_port_unlock(struct tb_port *port)
667 if (tb_switch_is_icm(port->sw))
669 if (!tb_port_is_null(port))
671 if (tb_switch_is_usb4(port->sw))
672 return usb4_port_unlock(port);
676 static int __tb_port_enable(struct tb_port *port, bool enable)
681 if (!tb_port_is_null(port))
684 ret = tb_port_read(port, &phy, TB_CFG_PORT,
685 port->cap_phy + LANE_ADP_CS_1, 1);
690 phy &= ~LANE_ADP_CS_1_LD;
692 phy |= LANE_ADP_CS_1_LD;
694 return tb_port_write(port, &phy, TB_CFG_PORT,
695 port->cap_phy + LANE_ADP_CS_1, 1);
699 * tb_port_enable() - Enable lane adapter
700 * @port: Port to enable (can be %NULL)
702 * This is used for lane 0 and 1 adapters to enable it.
704 int tb_port_enable(struct tb_port *port)
706 return __tb_port_enable(port, true);
710 * tb_port_disable() - Disable lane adapter
711 * @port: Port to disable (can be %NULL)
713 * This is used for lane 0 and 1 adapters to disable it.
715 int tb_port_disable(struct tb_port *port)
717 return __tb_port_enable(port, false);
721 * tb_init_port() - initialize a port
723 * This is a helper method for tb_switch_alloc. Does not check or initialize
724 * any downstream switches.
726 * Return: Returns 0 on success or an error code on failure.
728 static int tb_init_port(struct tb_port *port)
733 res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8);
735 if (res == -ENODEV) {
736 tb_dbg(port->sw->tb, " Port %d: not implemented\n",
738 port->disabled = true;
744 /* Port 0 is the switch itself and has no PHY. */
745 if (port->config.type == TB_TYPE_PORT && port->port != 0) {
746 cap = tb_port_find_cap(port, TB_PORT_CAP_PHY);
751 tb_port_WARN(port, "non switch port without a PHY\n");
753 cap = tb_port_find_cap(port, TB_PORT_CAP_USB4);
755 port->cap_usb4 = cap;
756 } else if (port->port != 0) {
757 cap = tb_port_find_cap(port, TB_PORT_CAP_ADAP);
759 port->cap_adap = cap;
762 tb_dump_port(port->sw->tb, &port->config);
764 INIT_LIST_HEAD(&port->list);
769 static int tb_port_alloc_hopid(struct tb_port *port, bool in, int min_hopid,
776 port_max_hopid = port->config.max_in_hop_id;
777 ida = &port->in_hopids;
779 port_max_hopid = port->config.max_out_hop_id;
780 ida = &port->out_hopids;
784 * NHI can use HopIDs 1-max for other adapters HopIDs 0-7 are
787 if (!tb_port_is_nhi(port) && min_hopid < TB_PATH_MIN_HOPID)
788 min_hopid = TB_PATH_MIN_HOPID;
790 if (max_hopid < 0 || max_hopid > port_max_hopid)
791 max_hopid = port_max_hopid;
793 return ida_simple_get(ida, min_hopid, max_hopid + 1, GFP_KERNEL);
797 * tb_port_alloc_in_hopid() - Allocate input HopID from port
798 * @port: Port to allocate HopID for
799 * @min_hopid: Minimum acceptable input HopID
800 * @max_hopid: Maximum acceptable input HopID
802 * Return: HopID between @min_hopid and @max_hopid or negative errno in
805 int tb_port_alloc_in_hopid(struct tb_port *port, int min_hopid, int max_hopid)
807 return tb_port_alloc_hopid(port, true, min_hopid, max_hopid);
811 * tb_port_alloc_out_hopid() - Allocate output HopID from port
812 * @port: Port to allocate HopID for
813 * @min_hopid: Minimum acceptable output HopID
814 * @max_hopid: Maximum acceptable output HopID
816 * Return: HopID between @min_hopid and @max_hopid or negative errno in
819 int tb_port_alloc_out_hopid(struct tb_port *port, int min_hopid, int max_hopid)
821 return tb_port_alloc_hopid(port, false, min_hopid, max_hopid);
825 * tb_port_release_in_hopid() - Release allocated input HopID from port
826 * @port: Port whose HopID to release
827 * @hopid: HopID to release
829 void tb_port_release_in_hopid(struct tb_port *port, int hopid)
831 ida_simple_remove(&port->in_hopids, hopid);
835 * tb_port_release_out_hopid() - Release allocated output HopID from port
836 * @port: Port whose HopID to release
837 * @hopid: HopID to release
839 void tb_port_release_out_hopid(struct tb_port *port, int hopid)
841 ida_simple_remove(&port->out_hopids, hopid);
844 static inline bool tb_switch_is_reachable(const struct tb_switch *parent,
845 const struct tb_switch *sw)
847 u64 mask = (1ULL << parent->config.depth * 8) - 1;
848 return (tb_route(parent) & mask) == (tb_route(sw) & mask);
852 * tb_next_port_on_path() - Return next port for given port on a path
853 * @start: Start port of the walk
854 * @end: End port of the walk
855 * @prev: Previous port (%NULL if this is the first)
857 * This function can be used to walk from one port to another if they
858 * are connected through zero or more switches. If the @prev is dual
859 * link port, the function follows that link and returns another end on
862 * If the @end port has been reached, return %NULL.
864 * Domain tb->lock must be held when this function is called.
866 struct tb_port *tb_next_port_on_path(struct tb_port *start, struct tb_port *end,
867 struct tb_port *prev)
869 struct tb_port *next;
874 if (prev->sw == end->sw) {
880 if (tb_switch_is_reachable(prev->sw, end->sw)) {
881 next = tb_port_at(tb_route(end->sw), prev->sw);
882 /* Walk down the topology if next == prev */
884 (next == prev || next->dual_link_port == prev))
887 if (tb_is_upstream_port(prev)) {
890 next = tb_upstream_port(prev->sw);
892 * Keep the same link if prev and next are both
895 if (next->dual_link_port &&
896 next->link_nr != prev->link_nr) {
897 next = next->dual_link_port;
902 return next != prev ? next : NULL;
906 * tb_port_get_link_speed() - Get current link speed
907 * @port: Port to check (USB4 or CIO)
909 * Returns link speed in Gb/s or negative errno in case of failure.
911 int tb_port_get_link_speed(struct tb_port *port)
919 ret = tb_port_read(port, &val, TB_CFG_PORT,
920 port->cap_phy + LANE_ADP_CS_1, 1);
924 speed = (val & LANE_ADP_CS_1_CURRENT_SPEED_MASK) >>
925 LANE_ADP_CS_1_CURRENT_SPEED_SHIFT;
926 return speed == LANE_ADP_CS_1_CURRENT_SPEED_GEN3 ? 20 : 10;
929 static int tb_port_get_link_width(struct tb_port *port)
937 ret = tb_port_read(port, &val, TB_CFG_PORT,
938 port->cap_phy + LANE_ADP_CS_1, 1);
942 return (val & LANE_ADP_CS_1_CURRENT_WIDTH_MASK) >>
943 LANE_ADP_CS_1_CURRENT_WIDTH_SHIFT;
946 static bool tb_port_is_width_supported(struct tb_port *port, int width)
954 ret = tb_port_read(port, &phy, TB_CFG_PORT,
955 port->cap_phy + LANE_ADP_CS_0, 1);
959 widths = (phy & LANE_ADP_CS_0_SUPPORTED_WIDTH_MASK) >>
960 LANE_ADP_CS_0_SUPPORTED_WIDTH_SHIFT;
962 return !!(widths & width);
965 static int tb_port_set_link_width(struct tb_port *port, unsigned int width)
973 ret = tb_port_read(port, &val, TB_CFG_PORT,
974 port->cap_phy + LANE_ADP_CS_1, 1);
978 val &= ~LANE_ADP_CS_1_TARGET_WIDTH_MASK;
981 val |= LANE_ADP_CS_1_TARGET_WIDTH_SINGLE <<
982 LANE_ADP_CS_1_TARGET_WIDTH_SHIFT;
985 val |= LANE_ADP_CS_1_TARGET_WIDTH_DUAL <<
986 LANE_ADP_CS_1_TARGET_WIDTH_SHIFT;
992 val |= LANE_ADP_CS_1_LB;
994 return tb_port_write(port, &val, TB_CFG_PORT,
995 port->cap_phy + LANE_ADP_CS_1, 1);
998 static int tb_port_lane_bonding_enable(struct tb_port *port)
1003 * Enable lane bonding for both links if not already enabled by
1004 * for example the boot firmware.
1006 ret = tb_port_get_link_width(port);
1008 ret = tb_port_set_link_width(port, 2);
1013 ret = tb_port_get_link_width(port->dual_link_port);
1015 ret = tb_port_set_link_width(port->dual_link_port, 2);
1017 tb_port_set_link_width(port, 1);
1022 port->bonded = true;
1023 port->dual_link_port->bonded = true;
1028 static void tb_port_lane_bonding_disable(struct tb_port *port)
1030 port->dual_link_port->bonded = false;
1031 port->bonded = false;
1033 tb_port_set_link_width(port->dual_link_port, 1);
1034 tb_port_set_link_width(port, 1);
1038 * tb_port_is_enabled() - Is the adapter port enabled
1039 * @port: Port to check
1041 bool tb_port_is_enabled(struct tb_port *port)
1043 switch (port->config.type) {
1044 case TB_TYPE_PCIE_UP:
1045 case TB_TYPE_PCIE_DOWN:
1046 return tb_pci_port_is_enabled(port);
1048 case TB_TYPE_DP_HDMI_IN:
1049 case TB_TYPE_DP_HDMI_OUT:
1050 return tb_dp_port_is_enabled(port);
1052 case TB_TYPE_USB3_UP:
1053 case TB_TYPE_USB3_DOWN:
1054 return tb_usb3_port_is_enabled(port);
1062 * tb_usb3_port_is_enabled() - Is the USB3 adapter port enabled
1063 * @port: USB3 adapter port to check
1065 bool tb_usb3_port_is_enabled(struct tb_port *port)
1069 if (tb_port_read(port, &data, TB_CFG_PORT,
1070 port->cap_adap + ADP_USB3_CS_0, 1))
1073 return !!(data & ADP_USB3_CS_0_PE);
1077 * tb_usb3_port_enable() - Enable USB3 adapter port
1078 * @port: USB3 adapter port to enable
1079 * @enable: Enable/disable the USB3 adapter
1081 int tb_usb3_port_enable(struct tb_port *port, bool enable)
1083 u32 word = enable ? (ADP_USB3_CS_0_PE | ADP_USB3_CS_0_V)
1086 if (!port->cap_adap)
1088 return tb_port_write(port, &word, TB_CFG_PORT,
1089 port->cap_adap + ADP_USB3_CS_0, 1);
1093 * tb_pci_port_is_enabled() - Is the PCIe adapter port enabled
1094 * @port: PCIe port to check
1096 bool tb_pci_port_is_enabled(struct tb_port *port)
1100 if (tb_port_read(port, &data, TB_CFG_PORT,
1101 port->cap_adap + ADP_PCIE_CS_0, 1))
1104 return !!(data & ADP_PCIE_CS_0_PE);
1108 * tb_pci_port_enable() - Enable PCIe adapter port
1109 * @port: PCIe port to enable
1110 * @enable: Enable/disable the PCIe adapter
1112 int tb_pci_port_enable(struct tb_port *port, bool enable)
1114 u32 word = enable ? ADP_PCIE_CS_0_PE : 0x0;
1115 if (!port->cap_adap)
1117 return tb_port_write(port, &word, TB_CFG_PORT,
1118 port->cap_adap + ADP_PCIE_CS_0, 1);
1122 * tb_dp_port_hpd_is_active() - Is HPD already active
1123 * @port: DP out port to check
1125 * Checks if the DP OUT adapter port has HDP bit already set.
1127 int tb_dp_port_hpd_is_active(struct tb_port *port)
1132 ret = tb_port_read(port, &data, TB_CFG_PORT,
1133 port->cap_adap + ADP_DP_CS_2, 1);
1137 return !!(data & ADP_DP_CS_2_HDP);
1141 * tb_dp_port_hpd_clear() - Clear HPD from DP IN port
1142 * @port: Port to clear HPD
1144 * If the DP IN port has HDP set, this function can be used to clear it.
1146 int tb_dp_port_hpd_clear(struct tb_port *port)
1151 ret = tb_port_read(port, &data, TB_CFG_PORT,
1152 port->cap_adap + ADP_DP_CS_3, 1);
1156 data |= ADP_DP_CS_3_HDPC;
1157 return tb_port_write(port, &data, TB_CFG_PORT,
1158 port->cap_adap + ADP_DP_CS_3, 1);
1162 * tb_dp_port_set_hops() - Set video/aux Hop IDs for DP port
1163 * @port: DP IN/OUT port to set hops
1164 * @video: Video Hop ID
1165 * @aux_tx: AUX TX Hop ID
1166 * @aux_rx: AUX RX Hop ID
1168 * Programs specified Hop IDs for DP IN/OUT port.
1170 int tb_dp_port_set_hops(struct tb_port *port, unsigned int video,
1171 unsigned int aux_tx, unsigned int aux_rx)
1176 ret = tb_port_read(port, data, TB_CFG_PORT,
1177 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
1181 data[0] &= ~ADP_DP_CS_0_VIDEO_HOPID_MASK;
1182 data[1] &= ~ADP_DP_CS_1_AUX_RX_HOPID_MASK;
1183 data[1] &= ~ADP_DP_CS_1_AUX_RX_HOPID_MASK;
1185 data[0] |= (video << ADP_DP_CS_0_VIDEO_HOPID_SHIFT) &
1186 ADP_DP_CS_0_VIDEO_HOPID_MASK;
1187 data[1] |= aux_tx & ADP_DP_CS_1_AUX_TX_HOPID_MASK;
1188 data[1] |= (aux_rx << ADP_DP_CS_1_AUX_RX_HOPID_SHIFT) &
1189 ADP_DP_CS_1_AUX_RX_HOPID_MASK;
1191 return tb_port_write(port, data, TB_CFG_PORT,
1192 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
1196 * tb_dp_port_is_enabled() - Is DP adapter port enabled
1197 * @port: DP adapter port to check
1199 bool tb_dp_port_is_enabled(struct tb_port *port)
1203 if (tb_port_read(port, data, TB_CFG_PORT, port->cap_adap + ADP_DP_CS_0,
1207 return !!(data[0] & (ADP_DP_CS_0_VE | ADP_DP_CS_0_AE));
1211 * tb_dp_port_enable() - Enables/disables DP paths of a port
1212 * @port: DP IN/OUT port
1213 * @enable: Enable/disable DP path
1215 * Once Hop IDs are programmed DP paths can be enabled or disabled by
1216 * calling this function.
1218 int tb_dp_port_enable(struct tb_port *port, bool enable)
1223 ret = tb_port_read(port, data, TB_CFG_PORT,
1224 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
1229 data[0] |= ADP_DP_CS_0_VE | ADP_DP_CS_0_AE;
1231 data[0] &= ~(ADP_DP_CS_0_VE | ADP_DP_CS_0_AE);
1233 return tb_port_write(port, data, TB_CFG_PORT,
1234 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
1237 /* switch utility functions */
1239 static const char *tb_switch_generation_name(const struct tb_switch *sw)
1241 switch (sw->generation) {
1243 return "Thunderbolt 1";
1245 return "Thunderbolt 2";
1247 return "Thunderbolt 3";
1255 static void tb_dump_switch(const struct tb *tb, const struct tb_switch *sw)
1257 const struct tb_regs_switch_header *regs = &sw->config;
1259 tb_dbg(tb, " %s Switch: %x:%x (Revision: %d, TB Version: %d)\n",
1260 tb_switch_generation_name(sw), regs->vendor_id, regs->device_id,
1261 regs->revision, regs->thunderbolt_version);
1262 tb_dbg(tb, " Max Port Number: %d\n", regs->max_port_number);
1263 tb_dbg(tb, " Config:\n");
1265 " Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n",
1266 regs->upstream_port_number, regs->depth,
1267 (((u64) regs->route_hi) << 32) | regs->route_lo,
1268 regs->enabled, regs->plug_events_delay);
1269 tb_dbg(tb, " unknown1: %#x unknown4: %#x\n",
1270 regs->__unknown1, regs->__unknown4);
1274 * reset_switch() - reconfigure route, enable and send TB_CFG_PKG_RESET
1275 * @sw: Switch to reset
1277 * Return: Returns 0 on success or an error code on failure.
1279 int tb_switch_reset(struct tb_switch *sw)
1281 struct tb_cfg_result res;
1283 if (sw->generation > 1)
1286 tb_sw_dbg(sw, "resetting switch\n");
1288 res.err = tb_sw_write(sw, ((u32 *) &sw->config) + 2,
1289 TB_CFG_SWITCH, 2, 2);
1292 res = tb_cfg_reset(sw->tb->ctl, tb_route(sw), TB_CFG_DEFAULT_TIMEOUT);
1299 * tb_plug_events_active() - enable/disable plug events on a switch
1301 * Also configures a sane plug_events_delay of 255ms.
1303 * Return: Returns 0 on success or an error code on failure.
1305 static int tb_plug_events_active(struct tb_switch *sw, bool active)
1310 if (tb_switch_is_icm(sw) || tb_switch_is_usb4(sw))
1313 sw->config.plug_events_delay = 0xff;
1314 res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1);
1318 res = tb_sw_read(sw, &data, TB_CFG_SWITCH, sw->cap_plug_events + 1, 1);
1323 data = data & 0xFFFFFF83;
1324 switch (sw->config.device_id) {
1325 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
1326 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
1327 case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
1335 return tb_sw_write(sw, &data, TB_CFG_SWITCH,
1336 sw->cap_plug_events + 1, 1);
1339 static ssize_t authorized_show(struct device *dev,
1340 struct device_attribute *attr,
1343 struct tb_switch *sw = tb_to_switch(dev);
1345 return sprintf(buf, "%u\n", sw->authorized);
1348 static int tb_switch_set_authorized(struct tb_switch *sw, unsigned int val)
1352 if (!mutex_trylock(&sw->tb->lock))
1353 return restart_syscall();
1359 /* Approve switch */
1362 ret = tb_domain_approve_switch_key(sw->tb, sw);
1364 ret = tb_domain_approve_switch(sw->tb, sw);
1367 /* Challenge switch */
1370 ret = tb_domain_challenge_switch_key(sw->tb, sw);
1378 sw->authorized = val;
1379 /* Notify status change to the userspace */
1380 kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE);
1384 mutex_unlock(&sw->tb->lock);
1388 static ssize_t authorized_store(struct device *dev,
1389 struct device_attribute *attr,
1390 const char *buf, size_t count)
1392 struct tb_switch *sw = tb_to_switch(dev);
1396 ret = kstrtouint(buf, 0, &val);
1402 pm_runtime_get_sync(&sw->dev);
1403 ret = tb_switch_set_authorized(sw, val);
1404 pm_runtime_mark_last_busy(&sw->dev);
1405 pm_runtime_put_autosuspend(&sw->dev);
1407 return ret ? ret : count;
1409 static DEVICE_ATTR_RW(authorized);
1411 static ssize_t boot_show(struct device *dev, struct device_attribute *attr,
1414 struct tb_switch *sw = tb_to_switch(dev);
1416 return sprintf(buf, "%u\n", sw->boot);
1418 static DEVICE_ATTR_RO(boot);
1420 static ssize_t device_show(struct device *dev, struct device_attribute *attr,
1423 struct tb_switch *sw = tb_to_switch(dev);
1425 return sprintf(buf, "%#x\n", sw->device);
1427 static DEVICE_ATTR_RO(device);
1430 device_name_show(struct device *dev, struct device_attribute *attr, char *buf)
1432 struct tb_switch *sw = tb_to_switch(dev);
1434 return sprintf(buf, "%s\n", sw->device_name ? sw->device_name : "");
1436 static DEVICE_ATTR_RO(device_name);
1439 generation_show(struct device *dev, struct device_attribute *attr, char *buf)
1441 struct tb_switch *sw = tb_to_switch(dev);
1443 return sprintf(buf, "%u\n", sw->generation);
1445 static DEVICE_ATTR_RO(generation);
1447 static ssize_t key_show(struct device *dev, struct device_attribute *attr,
1450 struct tb_switch *sw = tb_to_switch(dev);
1453 if (!mutex_trylock(&sw->tb->lock))
1454 return restart_syscall();
1457 ret = sprintf(buf, "%*phN\n", TB_SWITCH_KEY_SIZE, sw->key);
1459 ret = sprintf(buf, "\n");
1461 mutex_unlock(&sw->tb->lock);
1465 static ssize_t key_store(struct device *dev, struct device_attribute *attr,
1466 const char *buf, size_t count)
1468 struct tb_switch *sw = tb_to_switch(dev);
1469 u8 key[TB_SWITCH_KEY_SIZE];
1470 ssize_t ret = count;
1473 if (!strcmp(buf, "\n"))
1475 else if (hex2bin(key, buf, sizeof(key)))
1478 if (!mutex_trylock(&sw->tb->lock))
1479 return restart_syscall();
1481 if (sw->authorized) {
1488 sw->key = kmemdup(key, sizeof(key), GFP_KERNEL);
1494 mutex_unlock(&sw->tb->lock);
1497 static DEVICE_ATTR(key, 0600, key_show, key_store);
1499 static ssize_t speed_show(struct device *dev, struct device_attribute *attr,
1502 struct tb_switch *sw = tb_to_switch(dev);
1504 return sprintf(buf, "%u.0 Gb/s\n", sw->link_speed);
1508 * Currently all lanes must run at the same speed but we expose here
1509 * both directions to allow possible asymmetric links in the future.
1511 static DEVICE_ATTR(rx_speed, 0444, speed_show, NULL);
1512 static DEVICE_ATTR(tx_speed, 0444, speed_show, NULL);
1514 static ssize_t lanes_show(struct device *dev, struct device_attribute *attr,
1517 struct tb_switch *sw = tb_to_switch(dev);
1519 return sprintf(buf, "%u\n", sw->link_width);
1523 * Currently link has same amount of lanes both directions (1 or 2) but
1524 * expose them separately to allow possible asymmetric links in the future.
1526 static DEVICE_ATTR(rx_lanes, 0444, lanes_show, NULL);
1527 static DEVICE_ATTR(tx_lanes, 0444, lanes_show, NULL);
1529 static ssize_t nvm_authenticate_show(struct device *dev,
1530 struct device_attribute *attr, char *buf)
1532 struct tb_switch *sw = tb_to_switch(dev);
1535 nvm_get_auth_status(sw, &status);
1536 return sprintf(buf, "%#x\n", status);
1539 static ssize_t nvm_authenticate_sysfs(struct device *dev, const char *buf,
1542 struct tb_switch *sw = tb_to_switch(dev);
1546 pm_runtime_get_sync(&sw->dev);
1548 if (!mutex_trylock(&sw->tb->lock)) {
1549 ret = restart_syscall();
1553 /* If NVMem devices are not yet added */
1559 ret = kstrtoint(buf, 10, &val);
1563 /* Always clear the authentication status */
1564 nvm_clear_auth_status(sw);
1567 if (!sw->nvm->flushed) {
1568 if (!sw->nvm->buf) {
1573 ret = nvm_validate_and_write(sw);
1574 if (ret || val == WRITE_ONLY)
1577 if (val == WRITE_AND_AUTHENTICATE) {
1579 ret = tb_lc_force_power(sw);
1581 sw->nvm->authenticating = true;
1582 ret = nvm_authenticate(sw);
1588 mutex_unlock(&sw->tb->lock);
1590 pm_runtime_mark_last_busy(&sw->dev);
1591 pm_runtime_put_autosuspend(&sw->dev);
1596 static ssize_t nvm_authenticate_store(struct device *dev,
1597 struct device_attribute *attr, const char *buf, size_t count)
1599 int ret = nvm_authenticate_sysfs(dev, buf, false);
1604 static DEVICE_ATTR_RW(nvm_authenticate);
1606 static ssize_t nvm_authenticate_on_disconnect_show(struct device *dev,
1607 struct device_attribute *attr, char *buf)
1609 return nvm_authenticate_show(dev, attr, buf);
1612 static ssize_t nvm_authenticate_on_disconnect_store(struct device *dev,
1613 struct device_attribute *attr, const char *buf, size_t count)
1617 ret = nvm_authenticate_sysfs(dev, buf, true);
1618 return ret ? ret : count;
1620 static DEVICE_ATTR_RW(nvm_authenticate_on_disconnect);
1622 static ssize_t nvm_version_show(struct device *dev,
1623 struct device_attribute *attr, char *buf)
1625 struct tb_switch *sw = tb_to_switch(dev);
1628 if (!mutex_trylock(&sw->tb->lock))
1629 return restart_syscall();
1636 ret = sprintf(buf, "%x.%x\n", sw->nvm->major, sw->nvm->minor);
1638 mutex_unlock(&sw->tb->lock);
1642 static DEVICE_ATTR_RO(nvm_version);
1644 static ssize_t vendor_show(struct device *dev, struct device_attribute *attr,
1647 struct tb_switch *sw = tb_to_switch(dev);
1649 return sprintf(buf, "%#x\n", sw->vendor);
1651 static DEVICE_ATTR_RO(vendor);
1654 vendor_name_show(struct device *dev, struct device_attribute *attr, char *buf)
1656 struct tb_switch *sw = tb_to_switch(dev);
1658 return sprintf(buf, "%s\n", sw->vendor_name ? sw->vendor_name : "");
1660 static DEVICE_ATTR_RO(vendor_name);
1662 static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr,
1665 struct tb_switch *sw = tb_to_switch(dev);
1667 return sprintf(buf, "%pUb\n", sw->uuid);
1669 static DEVICE_ATTR_RO(unique_id);
1671 static struct attribute *switch_attrs[] = {
1672 &dev_attr_authorized.attr,
1673 &dev_attr_boot.attr,
1674 &dev_attr_device.attr,
1675 &dev_attr_device_name.attr,
1676 &dev_attr_generation.attr,
1678 &dev_attr_nvm_authenticate.attr,
1679 &dev_attr_nvm_authenticate_on_disconnect.attr,
1680 &dev_attr_nvm_version.attr,
1681 &dev_attr_rx_speed.attr,
1682 &dev_attr_rx_lanes.attr,
1683 &dev_attr_tx_speed.attr,
1684 &dev_attr_tx_lanes.attr,
1685 &dev_attr_vendor.attr,
1686 &dev_attr_vendor_name.attr,
1687 &dev_attr_unique_id.attr,
1691 static umode_t switch_attr_is_visible(struct kobject *kobj,
1692 struct attribute *attr, int n)
1694 struct device *dev = kobj_to_dev(kobj);
1695 struct tb_switch *sw = tb_to_switch(dev);
1697 if (attr == &dev_attr_device.attr) {
1700 } else if (attr == &dev_attr_device_name.attr) {
1701 if (!sw->device_name)
1703 } else if (attr == &dev_attr_vendor.attr) {
1706 } else if (attr == &dev_attr_vendor_name.attr) {
1707 if (!sw->vendor_name)
1709 } else if (attr == &dev_attr_key.attr) {
1711 sw->tb->security_level == TB_SECURITY_SECURE &&
1712 sw->security_level == TB_SECURITY_SECURE)
1715 } else if (attr == &dev_attr_rx_speed.attr ||
1716 attr == &dev_attr_rx_lanes.attr ||
1717 attr == &dev_attr_tx_speed.attr ||
1718 attr == &dev_attr_tx_lanes.attr) {
1722 } else if (attr == &dev_attr_nvm_authenticate.attr) {
1723 if (nvm_upgradeable(sw))
1726 } else if (attr == &dev_attr_nvm_version.attr) {
1727 if (nvm_readable(sw))
1730 } else if (attr == &dev_attr_boot.attr) {
1734 } else if (attr == &dev_attr_nvm_authenticate_on_disconnect.attr) {
1735 if (sw->quirks & QUIRK_FORCE_POWER_LINK_CONTROLLER)
1740 return sw->safe_mode ? 0 : attr->mode;
1743 static struct attribute_group switch_group = {
1744 .is_visible = switch_attr_is_visible,
1745 .attrs = switch_attrs,
1748 static const struct attribute_group *switch_groups[] = {
1753 static void tb_switch_release(struct device *dev)
1755 struct tb_switch *sw = tb_to_switch(dev);
1756 struct tb_port *port;
1758 dma_port_free(sw->dma_port);
1760 tb_switch_for_each_port(sw, port) {
1761 ida_destroy(&port->in_hopids);
1762 ida_destroy(&port->out_hopids);
1766 kfree(sw->device_name);
1767 kfree(sw->vendor_name);
1775 * Currently only need to provide the callbacks. Everything else is handled
1776 * in the connection manager.
1778 static int __maybe_unused tb_switch_runtime_suspend(struct device *dev)
1780 struct tb_switch *sw = tb_to_switch(dev);
1781 const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
1783 if (cm_ops->runtime_suspend_switch)
1784 return cm_ops->runtime_suspend_switch(sw);
1789 static int __maybe_unused tb_switch_runtime_resume(struct device *dev)
1791 struct tb_switch *sw = tb_to_switch(dev);
1792 const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
1794 if (cm_ops->runtime_resume_switch)
1795 return cm_ops->runtime_resume_switch(sw);
1799 static const struct dev_pm_ops tb_switch_pm_ops = {
1800 SET_RUNTIME_PM_OPS(tb_switch_runtime_suspend, tb_switch_runtime_resume,
1804 struct device_type tb_switch_type = {
1805 .name = "thunderbolt_device",
1806 .release = tb_switch_release,
1807 .pm = &tb_switch_pm_ops,
1810 static int tb_switch_get_generation(struct tb_switch *sw)
1812 switch (sw->config.device_id) {
1813 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
1814 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
1815 case PCI_DEVICE_ID_INTEL_LIGHT_PEAK:
1816 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_2C:
1817 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C:
1818 case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
1819 case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_2C_BRIDGE:
1820 case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_4C_BRIDGE:
1823 case PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_BRIDGE:
1824 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE:
1825 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE:
1828 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE:
1829 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_BRIDGE:
1830 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_BRIDGE:
1831 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE:
1832 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE:
1833 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_BRIDGE:
1834 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_BRIDGE:
1835 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_BRIDGE:
1836 case PCI_DEVICE_ID_INTEL_ICL_NHI0:
1837 case PCI_DEVICE_ID_INTEL_ICL_NHI1:
1841 if (tb_switch_is_usb4(sw))
1845 * For unknown switches assume generation to be 1 to be
1848 tb_sw_warn(sw, "unsupported switch device id %#x\n",
1849 sw->config.device_id);
1854 static bool tb_switch_exceeds_max_depth(const struct tb_switch *sw, int depth)
1858 if (tb_switch_is_usb4(sw) ||
1859 (sw->tb->root_switch && tb_switch_is_usb4(sw->tb->root_switch)))
1860 max_depth = USB4_SWITCH_MAX_DEPTH;
1862 max_depth = TB_SWITCH_MAX_DEPTH;
1864 return depth > max_depth;
1868 * tb_switch_alloc() - allocate a switch
1869 * @tb: Pointer to the owning domain
1870 * @parent: Parent device for this switch
1871 * @route: Route string for this switch
1873 * Allocates and initializes a switch. Will not upload configuration to
1874 * the switch. For that you need to call tb_switch_configure()
1875 * separately. The returned switch should be released by calling
1878 * Return: Pointer to the allocated switch or ERR_PTR() in case of
1881 struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,
1884 struct tb_switch *sw;
1888 /* Unlock the downstream port so we can access the switch below */
1890 struct tb_switch *parent_sw = tb_to_switch(parent);
1891 struct tb_port *down;
1893 down = tb_port_at(route, parent_sw);
1894 tb_port_unlock(down);
1897 depth = tb_route_length(route);
1899 upstream_port = tb_cfg_get_upstream_port(tb->ctl, route);
1900 if (upstream_port < 0)
1901 return ERR_PTR(upstream_port);
1903 sw = kzalloc(sizeof(*sw), GFP_KERNEL);
1905 return ERR_PTR(-ENOMEM);
1908 ret = tb_cfg_read(tb->ctl, &sw->config, route, 0, TB_CFG_SWITCH, 0, 5);
1910 goto err_free_sw_ports;
1912 sw->generation = tb_switch_get_generation(sw);
1914 tb_dbg(tb, "current switch config:\n");
1915 tb_dump_switch(tb, sw);
1917 /* configure switch */
1918 sw->config.upstream_port_number = upstream_port;
1919 sw->config.depth = depth;
1920 sw->config.route_hi = upper_32_bits(route);
1921 sw->config.route_lo = lower_32_bits(route);
1922 sw->config.enabled = 0;
1924 /* Make sure we do not exceed maximum topology limit */
1925 if (tb_switch_exceeds_max_depth(sw, depth)) {
1926 ret = -EADDRNOTAVAIL;
1927 goto err_free_sw_ports;
1930 /* initialize ports */
1931 sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports),
1935 goto err_free_sw_ports;
1938 for (i = 0; i <= sw->config.max_port_number; i++) {
1939 /* minimum setup for tb_find_cap and tb_drom_read to work */
1940 sw->ports[i].sw = sw;
1941 sw->ports[i].port = i;
1943 /* Control port does not need HopID allocation */
1945 ida_init(&sw->ports[i].in_hopids);
1946 ida_init(&sw->ports[i].out_hopids);
1950 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_PLUG_EVENTS);
1952 sw->cap_plug_events = ret;
1954 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_LINK_CONTROLLER);
1958 /* Root switch is always authorized */
1960 sw->authorized = true;
1962 device_initialize(&sw->dev);
1963 sw->dev.parent = parent;
1964 sw->dev.bus = &tb_bus_type;
1965 sw->dev.type = &tb_switch_type;
1966 sw->dev.groups = switch_groups;
1967 dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
1975 return ERR_PTR(ret);
1979 * tb_switch_alloc_safe_mode() - allocate a switch that is in safe mode
1980 * @tb: Pointer to the owning domain
1981 * @parent: Parent device for this switch
1982 * @route: Route string for this switch
1984 * This creates a switch in safe mode. This means the switch pretty much
1985 * lacks all capabilities except DMA configuration port before it is
1986 * flashed with a valid NVM firmware.
1988 * The returned switch must be released by calling tb_switch_put().
1990 * Return: Pointer to the allocated switch or ERR_PTR() in case of failure
1993 tb_switch_alloc_safe_mode(struct tb *tb, struct device *parent, u64 route)
1995 struct tb_switch *sw;
1997 sw = kzalloc(sizeof(*sw), GFP_KERNEL);
1999 return ERR_PTR(-ENOMEM);
2002 sw->config.depth = tb_route_length(route);
2003 sw->config.route_hi = upper_32_bits(route);
2004 sw->config.route_lo = lower_32_bits(route);
2005 sw->safe_mode = true;
2007 device_initialize(&sw->dev);
2008 sw->dev.parent = parent;
2009 sw->dev.bus = &tb_bus_type;
2010 sw->dev.type = &tb_switch_type;
2011 sw->dev.groups = switch_groups;
2012 dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
2018 * tb_switch_configure() - Uploads configuration to the switch
2019 * @sw: Switch to configure
2021 * Call this function before the switch is added to the system. It will
2022 * upload configuration to the switch and makes it available for the
2023 * connection manager to use. Can be called to the switch again after
2024 * resume from low power states to re-initialize it.
2026 * Return: %0 in case of success and negative errno in case of failure
2028 int tb_switch_configure(struct tb_switch *sw)
2030 struct tb *tb = sw->tb;
2034 route = tb_route(sw);
2036 tb_dbg(tb, "%s Switch at %#llx (depth: %d, up port: %d)\n",
2037 sw->config.enabled ? "restoring" : "initializing", route,
2038 tb_route_length(route), sw->config.upstream_port_number);
2040 sw->config.enabled = 1;
2042 if (tb_switch_is_usb4(sw)) {
2044 * For USB4 devices, we need to program the CM version
2045 * accordingly so that it knows to expose all the
2046 * additional capabilities.
2048 sw->config.cmuv = USB4_VERSION_1_0;
2049 sw->config.plug_events_delay = 0xa;
2051 /* Enumerate the switch */
2052 ret = tb_sw_write(sw, (u32 *)&sw->config + 1, TB_CFG_SWITCH,
2057 ret = usb4_switch_setup(sw);
2059 if (sw->config.vendor_id != PCI_VENDOR_ID_INTEL)
2060 tb_sw_warn(sw, "unknown switch vendor id %#x\n",
2061 sw->config.vendor_id);
2063 if (!sw->cap_plug_events) {
2064 tb_sw_warn(sw, "cannot find TB_VSE_CAP_PLUG_EVENTS aborting\n");
2068 /* Enumerate the switch */
2069 ret = tb_sw_write(sw, (u32 *)&sw->config + 1, TB_CFG_SWITCH,
2075 return tb_plug_events_active(sw, true);
2078 static int tb_switch_set_uuid(struct tb_switch *sw)
2087 if (tb_switch_is_usb4(sw)) {
2088 ret = usb4_switch_read_uid(sw, &sw->uid);
2094 * The newer controllers include fused UUID as part of
2095 * link controller specific registers
2097 ret = tb_lc_read_uuid(sw, uuid);
2107 * ICM generates UUID based on UID and fills the upper
2108 * two words with ones. This is not strictly following
2109 * UUID format but we want to be compatible with it so
2110 * we do the same here.
2112 uuid[0] = sw->uid & 0xffffffff;
2113 uuid[1] = (sw->uid >> 32) & 0xffffffff;
2114 uuid[2] = 0xffffffff;
2115 uuid[3] = 0xffffffff;
2118 sw->uuid = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
2124 static int tb_switch_add_dma_port(struct tb_switch *sw)
2129 switch (sw->generation) {
2131 /* Only root switch can be upgraded */
2137 ret = tb_switch_set_uuid(sw);
2144 * DMA port is the only thing available when the switch
2152 /* Root switch DMA port requires running firmware */
2153 if (!tb_route(sw) && !tb_switch_is_icm(sw))
2156 sw->dma_port = dma_port_alloc(sw);
2160 if (sw->no_nvm_upgrade)
2164 * If there is status already set then authentication failed
2165 * when the dma_port_flash_update_auth() returned. Power cycling
2166 * is not needed (it was done already) so only thing we do here
2167 * is to unblock runtime PM of the root port.
2169 nvm_get_auth_status(sw, &status);
2172 nvm_authenticate_complete_dma_port(sw);
2177 * Check status of the previous flash authentication. If there
2178 * is one we need to power cycle the switch in any case to make
2179 * it functional again.
2181 ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
2185 /* Now we can allow root port to suspend again */
2187 nvm_authenticate_complete_dma_port(sw);
2190 tb_sw_info(sw, "switch flash authentication failed\n");
2191 nvm_set_auth_status(sw, status);
2194 tb_sw_info(sw, "power cycling the switch now\n");
2195 dma_port_power_cycle(sw->dma_port);
2198 * We return error here which causes the switch adding failure.
2199 * It should appear back after power cycle is complete.
2204 static void tb_switch_default_link_ports(struct tb_switch *sw)
2208 for (i = 1; i <= sw->config.max_port_number; i++) {
2209 struct tb_port *port = &sw->ports[i];
2210 struct tb_port *subordinate;
2212 if (!tb_port_is_null(port))
2215 /* Check for the subordinate port */
2216 if (i == sw->config.max_port_number ||
2217 !tb_port_is_null(&sw->ports[i + 1]))
2220 /* Link them if not already done so (by DROM) */
2221 subordinate = &sw->ports[i + 1];
2222 if (!port->dual_link_port && !subordinate->dual_link_port) {
2224 port->dual_link_port = subordinate;
2225 subordinate->link_nr = 1;
2226 subordinate->dual_link_port = port;
2228 tb_sw_dbg(sw, "linked ports %d <-> %d\n",
2229 port->port, subordinate->port);
2234 static bool tb_switch_lane_bonding_possible(struct tb_switch *sw)
2236 const struct tb_port *up = tb_upstream_port(sw);
2238 if (!up->dual_link_port || !up->dual_link_port->remote)
2241 if (tb_switch_is_usb4(sw))
2242 return usb4_switch_lane_bonding_possible(sw);
2243 return tb_lc_lane_bonding_possible(sw);
2246 static int tb_switch_update_link_attributes(struct tb_switch *sw)
2249 bool change = false;
2252 if (!tb_route(sw) || tb_switch_is_icm(sw))
2255 up = tb_upstream_port(sw);
2257 ret = tb_port_get_link_speed(up);
2260 if (sw->link_speed != ret)
2262 sw->link_speed = ret;
2264 ret = tb_port_get_link_width(up);
2267 if (sw->link_width != ret)
2269 sw->link_width = ret;
2271 /* Notify userspace that there is possible link attribute change */
2272 if (device_is_registered(&sw->dev) && change)
2273 kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE);
2279 * tb_switch_lane_bonding_enable() - Enable lane bonding
2280 * @sw: Switch to enable lane bonding
2282 * Connection manager can call this function to enable lane bonding of a
2283 * switch. If conditions are correct and both switches support the feature,
2284 * lanes are bonded. It is safe to call this to any switch.
2286 int tb_switch_lane_bonding_enable(struct tb_switch *sw)
2288 struct tb_switch *parent = tb_to_switch(sw->dev.parent);
2289 struct tb_port *up, *down;
2290 u64 route = tb_route(sw);
2296 if (!tb_switch_lane_bonding_possible(sw))
2299 up = tb_upstream_port(sw);
2300 down = tb_port_at(route, parent);
2302 if (!tb_port_is_width_supported(up, 2) ||
2303 !tb_port_is_width_supported(down, 2))
2307 * Both lanes need to be in CL0. Here we assume lane 0 already be in
2308 * CL0 and check just for lane 1.
2310 if (tb_wait_for_port(down->dual_link_port, false) <= 0)
2313 ret = tb_port_lane_bonding_enable(up);
2315 tb_port_warn(up, "failed to enable lane bonding\n");
2319 ret = tb_port_lane_bonding_enable(down);
2321 tb_port_warn(down, "failed to enable lane bonding\n");
2322 tb_port_lane_bonding_disable(up);
2326 tb_switch_update_link_attributes(sw);
2328 tb_sw_dbg(sw, "lane bonding enabled\n");
2333 * tb_switch_lane_bonding_disable() - Disable lane bonding
2334 * @sw: Switch whose lane bonding to disable
2336 * Disables lane bonding between @sw and parent. This can be called even
2337 * if lanes were not bonded originally.
2339 void tb_switch_lane_bonding_disable(struct tb_switch *sw)
2341 struct tb_switch *parent = tb_to_switch(sw->dev.parent);
2342 struct tb_port *up, *down;
2347 up = tb_upstream_port(sw);
2351 down = tb_port_at(tb_route(sw), parent);
2353 tb_port_lane_bonding_disable(up);
2354 tb_port_lane_bonding_disable(down);
2356 tb_switch_update_link_attributes(sw);
2357 tb_sw_dbg(sw, "lane bonding disabled\n");
2361 * tb_switch_configure_link() - Set link configured
2362 * @sw: Switch whose link is configured
2364 * Sets the link upstream from @sw configured (from both ends) so that
2365 * it will not be disconnected when the domain exits sleep. Can be
2366 * called for any switch.
2368 * It is recommended that this is called after lane bonding is enabled.
2370 * Returns %0 on success and negative errno in case of error.
2372 int tb_switch_configure_link(struct tb_switch *sw)
2374 struct tb_port *up, *down;
2377 if (!tb_route(sw) || tb_switch_is_icm(sw))
2380 up = tb_upstream_port(sw);
2381 if (tb_switch_is_usb4(up->sw))
2382 ret = usb4_port_configure(up);
2384 ret = tb_lc_configure_port(up);
2389 if (tb_switch_is_usb4(down->sw))
2390 return usb4_port_configure(down);
2391 return tb_lc_configure_port(down);
2395 * tb_switch_unconfigure_link() - Unconfigure link
2396 * @sw: Switch whose link is unconfigured
2398 * Sets the link unconfigured so the @sw will be disconnected if the
2399 * domain exists sleep.
2401 void tb_switch_unconfigure_link(struct tb_switch *sw)
2403 struct tb_port *up, *down;
2405 if (!tb_route(sw) || tb_switch_is_icm(sw))
2409 * Unconfigure downstream port so that wake-on-connect can be
2410 * configured after router unplug. No need to unconfigure upstream port
2411 * since its router is unplugged.
2413 up = tb_upstream_port(sw);
2415 if (tb_switch_is_usb4(down->sw))
2416 usb4_port_unconfigure(down);
2418 tb_lc_unconfigure_port(down);
2420 if (sw->is_unplugged)
2423 up = tb_upstream_port(sw);
2424 if (tb_switch_is_usb4(up->sw))
2425 usb4_port_unconfigure(up);
2427 tb_lc_unconfigure_port(up);
2430 static int tb_switch_port_hotplug_enable(struct tb_switch *sw)
2432 struct tb_port *port;
2434 if (tb_switch_is_icm(sw))
2437 tb_switch_for_each_port(sw, port) {
2440 if (!port->cap_usb4)
2443 res = usb4_port_hotplug_enable(port);
2451 * tb_switch_add() - Add a switch to the domain
2452 * @sw: Switch to add
2454 * This is the last step in adding switch to the domain. It will read
2455 * identification information from DROM and initializes ports so that
2456 * they can be used to connect other switches. The switch will be
2457 * exposed to the userspace when this function successfully returns. To
2458 * remove and release the switch, call tb_switch_remove().
2460 * Return: %0 in case of success and negative errno in case of failure
2462 int tb_switch_add(struct tb_switch *sw)
2467 * Initialize DMA control port now before we read DROM. Recent
2468 * host controllers have more complete DROM on NVM that includes
2469 * vendor and model identification strings which we then expose
2470 * to the userspace. NVM can be accessed through DMA
2471 * configuration based mailbox.
2473 ret = tb_switch_add_dma_port(sw);
2475 dev_err(&sw->dev, "failed to add DMA port\n");
2479 if (!sw->safe_mode) {
2481 ret = tb_drom_read(sw);
2483 dev_err(&sw->dev, "reading DROM failed\n");
2486 tb_sw_dbg(sw, "uid: %#llx\n", sw->uid);
2488 ret = tb_switch_set_uuid(sw);
2490 dev_err(&sw->dev, "failed to set UUID\n");
2494 for (i = 0; i <= sw->config.max_port_number; i++) {
2495 if (sw->ports[i].disabled) {
2496 tb_port_dbg(&sw->ports[i], "disabled by eeprom\n");
2499 ret = tb_init_port(&sw->ports[i]);
2501 dev_err(&sw->dev, "failed to initialize port %d\n", i);
2506 tb_switch_default_link_ports(sw);
2508 ret = tb_switch_update_link_attributes(sw);
2512 ret = tb_switch_tmu_init(sw);
2517 ret = tb_switch_port_hotplug_enable(sw);
2521 ret = device_add(&sw->dev);
2523 dev_err(&sw->dev, "failed to add device: %d\n", ret);
2528 dev_info(&sw->dev, "new device found, vendor=%#x device=%#x\n",
2529 sw->vendor, sw->device);
2530 if (sw->vendor_name && sw->device_name)
2531 dev_info(&sw->dev, "%s %s\n", sw->vendor_name,
2535 ret = tb_switch_nvm_add(sw);
2537 dev_err(&sw->dev, "failed to add NVM devices\n");
2538 device_del(&sw->dev);
2543 * Thunderbolt routers do not generate wakeups themselves but
2544 * they forward wakeups from tunneled protocols, so enable it
2547 device_init_wakeup(&sw->dev, true);
2549 pm_runtime_set_active(&sw->dev);
2551 pm_runtime_set_autosuspend_delay(&sw->dev, TB_AUTOSUSPEND_DELAY);
2552 pm_runtime_use_autosuspend(&sw->dev);
2553 pm_runtime_mark_last_busy(&sw->dev);
2554 pm_runtime_enable(&sw->dev);
2555 pm_request_autosuspend(&sw->dev);
2558 tb_switch_debugfs_init(sw);
2563 * tb_switch_remove() - Remove and release a switch
2564 * @sw: Switch to remove
2566 * This will remove the switch from the domain and release it after last
2567 * reference count drops to zero. If there are switches connected below
2568 * this switch, they will be removed as well.
2570 void tb_switch_remove(struct tb_switch *sw)
2572 struct tb_port *port;
2574 tb_switch_debugfs_remove(sw);
2577 pm_runtime_get_sync(&sw->dev);
2578 pm_runtime_disable(&sw->dev);
2581 /* port 0 is the switch itself and never has a remote */
2582 tb_switch_for_each_port(sw, port) {
2583 if (tb_port_has_remote(port)) {
2584 tb_switch_remove(port->remote->sw);
2585 port->remote = NULL;
2586 } else if (port->xdomain) {
2587 tb_xdomain_remove(port->xdomain);
2588 port->xdomain = NULL;
2591 /* Remove any downstream retimers */
2592 tb_retimer_remove_all(port);
2595 if (!sw->is_unplugged)
2596 tb_plug_events_active(sw, false);
2598 tb_switch_nvm_remove(sw);
2601 dev_info(&sw->dev, "device disconnected\n");
2602 device_unregister(&sw->dev);
2606 * tb_sw_set_unplugged() - set is_unplugged on switch and downstream switches
2608 void tb_sw_set_unplugged(struct tb_switch *sw)
2610 struct tb_port *port;
2612 if (sw == sw->tb->root_switch) {
2613 tb_sw_WARN(sw, "cannot unplug root switch\n");
2616 if (sw->is_unplugged) {
2617 tb_sw_WARN(sw, "is_unplugged already set\n");
2620 sw->is_unplugged = true;
2621 tb_switch_for_each_port(sw, port) {
2622 if (tb_port_has_remote(port))
2623 tb_sw_set_unplugged(port->remote->sw);
2624 else if (port->xdomain)
2625 port->xdomain->is_unplugged = true;
2629 static int tb_switch_set_wake(struct tb_switch *sw, unsigned int flags)
2632 tb_sw_dbg(sw, "enabling wakeup: %#x\n", flags);
2634 tb_sw_dbg(sw, "disabling wakeup\n");
2636 if (tb_switch_is_usb4(sw))
2637 return usb4_switch_set_wake(sw, flags);
2638 return tb_lc_set_wake(sw, flags);
2641 static void tb_switch_check_wakes(struct tb_switch *sw)
2643 if (device_may_wakeup(&sw->dev)) {
2644 if (tb_switch_is_usb4(sw))
2645 usb4_switch_check_wakes(sw);
2650 * tb_switch_resume() - Resume a switch after sleep
2651 * @sw: Switch to resume
2652 * @runtime: Is this resume from runtime suspend or system sleep
2654 * Resumes and re-enumerates router (and all its children), if still plugged
2655 * after suspend. Don't enumerate device router whose UID was changed during
2656 * suspend. If this is resume from system sleep, notifies PM core about the
2657 * wakes occurred during suspend. Disables all wakes, except USB4 wake of
2658 * upstream port for USB4 routers that shall be always enabled.
2660 int tb_switch_resume(struct tb_switch *sw, bool runtime)
2662 struct tb_port *port;
2665 tb_sw_dbg(sw, "resuming switch\n");
2668 * Check for UID of the connected switches except for root
2669 * switch which we assume cannot be removed.
2675 * Check first that we can still read the switch config
2676 * space. It may be that there is now another domain
2679 err = tb_cfg_get_upstream_port(sw->tb->ctl, tb_route(sw));
2681 tb_sw_info(sw, "switch not present anymore\n");
2685 if (tb_switch_is_usb4(sw))
2686 err = usb4_switch_read_uid(sw, &uid);
2688 err = tb_drom_read_uid_only(sw, &uid);
2690 tb_sw_warn(sw, "uid read failed\n");
2693 if (sw->uid != uid) {
2695 "changed while suspended (uid %#llx -> %#llx)\n",
2701 err = tb_switch_configure(sw);
2706 tb_switch_check_wakes(sw);
2709 tb_switch_set_wake(sw, 0);
2711 err = tb_switch_tmu_init(sw);
2715 /* check for surviving downstream switches */
2716 tb_switch_for_each_port(sw, port) {
2717 if (!tb_port_has_remote(port) && !port->xdomain)
2720 if (tb_wait_for_port(port, true) <= 0) {
2722 "lost during suspend, disconnecting\n");
2723 if (tb_port_has_remote(port))
2724 tb_sw_set_unplugged(port->remote->sw);
2725 else if (port->xdomain)
2726 port->xdomain->is_unplugged = true;
2727 } else if (tb_port_has_remote(port) || port->xdomain) {
2729 * Always unlock the port so the downstream
2730 * switch/domain is accessible.
2732 if (tb_port_unlock(port))
2733 tb_port_warn(port, "failed to unlock port\n");
2735 tb_switch_resume(port->remote->sw, runtime)) {
2737 "lost during suspend, disconnecting\n");
2738 tb_sw_set_unplugged(port->remote->sw);
2746 * tb_switch_suspend() - Put a switch to sleep
2747 * @sw: Switch to suspend
2748 * @runtime: Is this runtime suspend or system sleep
2750 * Suspends router and all its children. Enables wakes according to
2751 * value of @runtime and then sets sleep bit for the router. If @sw is
2752 * host router the domain is ready to go to sleep once this function
2755 void tb_switch_suspend(struct tb_switch *sw, bool runtime)
2757 unsigned int flags = 0;
2758 struct tb_port *port;
2761 tb_sw_dbg(sw, "suspending switch\n");
2763 err = tb_plug_events_active(sw, false);
2767 tb_switch_for_each_port(sw, port) {
2768 if (tb_port_has_remote(port))
2769 tb_switch_suspend(port->remote->sw, runtime);
2773 /* Trigger wake when something is plugged in/out */
2774 flags |= TB_WAKE_ON_CONNECT | TB_WAKE_ON_DISCONNECT;
2775 flags |= TB_WAKE_ON_USB4 | TB_WAKE_ON_USB3 | TB_WAKE_ON_PCIE;
2776 } else if (device_may_wakeup(&sw->dev)) {
2777 flags |= TB_WAKE_ON_USB4 | TB_WAKE_ON_USB3 | TB_WAKE_ON_PCIE;
2780 tb_switch_set_wake(sw, flags);
2782 if (tb_switch_is_usb4(sw))
2783 usb4_switch_set_sleep(sw);
2785 tb_lc_set_sleep(sw);
2789 * tb_switch_query_dp_resource() - Query availability of DP resource
2790 * @sw: Switch whose DP resource is queried
2793 * Queries availability of DP resource for DP tunneling using switch
2794 * specific means. Returns %true if resource is available.
2796 bool tb_switch_query_dp_resource(struct tb_switch *sw, struct tb_port *in)
2798 if (tb_switch_is_usb4(sw))
2799 return usb4_switch_query_dp_resource(sw, in);
2800 return tb_lc_dp_sink_query(sw, in);
2804 * tb_switch_alloc_dp_resource() - Allocate available DP resource
2805 * @sw: Switch whose DP resource is allocated
2808 * Allocates DP resource for DP tunneling. The resource must be
2809 * available for this to succeed (see tb_switch_query_dp_resource()).
2810 * Returns %0 in success and negative errno otherwise.
2812 int tb_switch_alloc_dp_resource(struct tb_switch *sw, struct tb_port *in)
2814 if (tb_switch_is_usb4(sw))
2815 return usb4_switch_alloc_dp_resource(sw, in);
2816 return tb_lc_dp_sink_alloc(sw, in);
2820 * tb_switch_dealloc_dp_resource() - De-allocate DP resource
2821 * @sw: Switch whose DP resource is de-allocated
2824 * De-allocates DP resource that was previously allocated for DP
2827 void tb_switch_dealloc_dp_resource(struct tb_switch *sw, struct tb_port *in)
2831 if (tb_switch_is_usb4(sw))
2832 ret = usb4_switch_dealloc_dp_resource(sw, in);
2834 ret = tb_lc_dp_sink_dealloc(sw, in);
2837 tb_sw_warn(sw, "failed to de-allocate DP resource for port %d\n",
2841 struct tb_sw_lookup {
2849 static int tb_switch_match(struct device *dev, const void *data)
2851 struct tb_switch *sw = tb_to_switch(dev);
2852 const struct tb_sw_lookup *lookup = data;
2856 if (sw->tb != lookup->tb)
2860 return !memcmp(sw->uuid, lookup->uuid, sizeof(*lookup->uuid));
2862 if (lookup->route) {
2863 return sw->config.route_lo == lower_32_bits(lookup->route) &&
2864 sw->config.route_hi == upper_32_bits(lookup->route);
2867 /* Root switch is matched only by depth */
2871 return sw->link == lookup->link && sw->depth == lookup->depth;
2875 * tb_switch_find_by_link_depth() - Find switch by link and depth
2876 * @tb: Domain the switch belongs
2877 * @link: Link number the switch is connected
2878 * @depth: Depth of the switch in link
2880 * Returned switch has reference count increased so the caller needs to
2881 * call tb_switch_put() when done with the switch.
2883 struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link, u8 depth)
2885 struct tb_sw_lookup lookup;
2888 memset(&lookup, 0, sizeof(lookup));
2891 lookup.depth = depth;
2893 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
2895 return tb_to_switch(dev);
2901 * tb_switch_find_by_uuid() - Find switch by UUID
2902 * @tb: Domain the switch belongs
2903 * @uuid: UUID to look for
2905 * Returned switch has reference count increased so the caller needs to
2906 * call tb_switch_put() when done with the switch.
2908 struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_t *uuid)
2910 struct tb_sw_lookup lookup;
2913 memset(&lookup, 0, sizeof(lookup));
2917 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
2919 return tb_to_switch(dev);
2925 * tb_switch_find_by_route() - Find switch by route string
2926 * @tb: Domain the switch belongs
2927 * @route: Route string to look for
2929 * Returned switch has reference count increased so the caller needs to
2930 * call tb_switch_put() when done with the switch.
2932 struct tb_switch *tb_switch_find_by_route(struct tb *tb, u64 route)
2934 struct tb_sw_lookup lookup;
2938 return tb_switch_get(tb->root_switch);
2940 memset(&lookup, 0, sizeof(lookup));
2942 lookup.route = route;
2944 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
2946 return tb_to_switch(dev);
2952 * tb_switch_find_port() - return the first port of @type on @sw or NULL
2953 * @sw: Switch to find the port from
2954 * @type: Port type to look for
2956 struct tb_port *tb_switch_find_port(struct tb_switch *sw,
2957 enum tb_port_type type)
2959 struct tb_port *port;
2961 tb_switch_for_each_port(sw, port) {
2962 if (port->config.type == type)