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>
16 #include <linux/vmalloc.h>
20 /* Switch NVM support */
22 #define NVM_DEVID 0x05
23 #define NVM_VERSION 0x08
25 #define NVM_FLASH_SIZE 0x45
27 #define NVM_MIN_SIZE SZ_32K
28 #define NVM_MAX_SIZE SZ_512K
30 static DEFINE_IDA(nvm_ida);
32 struct nvm_auth_status {
33 struct list_head list;
39 * Hold NVM authentication failure status per switch This information
40 * needs to stay around even when the switch gets power cycled so we
43 static LIST_HEAD(nvm_auth_status_cache);
44 static DEFINE_MUTEX(nvm_auth_status_lock);
46 static struct nvm_auth_status *__nvm_get_auth_status(const struct tb_switch *sw)
48 struct nvm_auth_status *st;
50 list_for_each_entry(st, &nvm_auth_status_cache, list) {
51 if (uuid_equal(&st->uuid, sw->uuid))
58 static void nvm_get_auth_status(const struct tb_switch *sw, u32 *status)
60 struct nvm_auth_status *st;
62 mutex_lock(&nvm_auth_status_lock);
63 st = __nvm_get_auth_status(sw);
64 mutex_unlock(&nvm_auth_status_lock);
66 *status = st ? st->status : 0;
69 static void nvm_set_auth_status(const struct tb_switch *sw, u32 status)
71 struct nvm_auth_status *st;
73 if (WARN_ON(!sw->uuid))
76 mutex_lock(&nvm_auth_status_lock);
77 st = __nvm_get_auth_status(sw);
80 st = kzalloc(sizeof(*st), GFP_KERNEL);
84 memcpy(&st->uuid, sw->uuid, sizeof(st->uuid));
85 INIT_LIST_HEAD(&st->list);
86 list_add_tail(&st->list, &nvm_auth_status_cache);
91 mutex_unlock(&nvm_auth_status_lock);
94 static void nvm_clear_auth_status(const struct tb_switch *sw)
96 struct nvm_auth_status *st;
98 mutex_lock(&nvm_auth_status_lock);
99 st = __nvm_get_auth_status(sw);
104 mutex_unlock(&nvm_auth_status_lock);
107 static int nvm_validate_and_write(struct tb_switch *sw)
109 unsigned int image_size, hdr_size;
110 const u8 *buf = sw->nvm->buf;
117 image_size = sw->nvm->buf_data_size;
118 if (image_size < NVM_MIN_SIZE || image_size > NVM_MAX_SIZE)
122 * FARB pointer must point inside the image and must at least
123 * contain parts of the digital section we will be reading here.
125 hdr_size = (*(u32 *)buf) & 0xffffff;
126 if (hdr_size + NVM_DEVID + 2 >= image_size)
129 /* Digital section start should be aligned to 4k page */
130 if (!IS_ALIGNED(hdr_size, SZ_4K))
134 * Read digital section size and check that it also fits inside
137 ds_size = *(u16 *)(buf + hdr_size);
138 if (ds_size >= image_size)
141 if (!sw->safe_mode) {
145 * Make sure the device ID in the image matches the one
146 * we read from the switch config space.
148 device_id = *(u16 *)(buf + hdr_size + NVM_DEVID);
149 if (device_id != sw->config.device_id)
152 if (sw->generation < 3) {
153 /* Write CSS headers first */
154 ret = dma_port_flash_write(sw->dma_port,
155 DMA_PORT_CSS_ADDRESS, buf + NVM_CSS,
156 DMA_PORT_CSS_MAX_SIZE);
161 /* Skip headers in the image */
163 image_size -= hdr_size;
166 return dma_port_flash_write(sw->dma_port, 0, buf, image_size);
169 static int nvm_authenticate_host(struct tb_switch *sw)
174 * Root switch NVM upgrade requires that we disconnect the
175 * existing paths first (in case it is not in safe mode
178 if (!sw->safe_mode) {
181 ret = tb_domain_disconnect_all_paths(sw->tb);
185 * The host controller goes away pretty soon after this if
186 * everything goes well so getting timeout is expected.
188 ret = dma_port_flash_update_auth(sw->dma_port);
189 if (!ret || ret == -ETIMEDOUT)
193 * Any error from update auth operation requires power
194 * cycling of the host router.
196 tb_sw_warn(sw, "failed to authenticate NVM, power cycling\n");
197 if (dma_port_flash_update_auth_status(sw->dma_port, &status) > 0)
198 nvm_set_auth_status(sw, status);
202 * From safe mode we can get out by just power cycling the
205 dma_port_power_cycle(sw->dma_port);
209 static int nvm_authenticate_device(struct tb_switch *sw)
211 int ret, retries = 10;
213 ret = dma_port_flash_update_auth(sw->dma_port);
219 /* Power cycle is required */
226 * Poll here for the authentication status. It takes some time
227 * for the device to respond (we get timeout for a while). Once
228 * we get response the device needs to be power cycled in order
229 * to the new NVM to be taken into use.
234 ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
235 if (ret < 0 && ret != -ETIMEDOUT)
239 tb_sw_warn(sw, "failed to authenticate NVM\n");
240 nvm_set_auth_status(sw, status);
243 tb_sw_info(sw, "power cycling the switch now\n");
244 dma_port_power_cycle(sw->dma_port);
254 static int tb_switch_nvm_read(void *priv, unsigned int offset, void *val,
257 struct tb_switch *sw = priv;
260 pm_runtime_get_sync(&sw->dev);
262 if (!mutex_trylock(&sw->tb->lock)) {
263 ret = restart_syscall();
267 ret = dma_port_flash_read(sw->dma_port, offset, val, bytes);
268 mutex_unlock(&sw->tb->lock);
271 pm_runtime_mark_last_busy(&sw->dev);
272 pm_runtime_put_autosuspend(&sw->dev);
277 static int tb_switch_nvm_no_read(void *priv, unsigned int offset, void *val,
283 static int tb_switch_nvm_write(void *priv, unsigned int offset, void *val,
286 struct tb_switch *sw = priv;
289 if (!mutex_trylock(&sw->tb->lock))
290 return restart_syscall();
293 * Since writing the NVM image might require some special steps,
294 * for example when CSS headers are written, we cache the image
295 * locally here and handle the special cases when the user asks
296 * us to authenticate the image.
299 sw->nvm->buf = vmalloc(NVM_MAX_SIZE);
306 sw->nvm->buf_data_size = offset + bytes;
307 memcpy(sw->nvm->buf + offset, val, bytes);
310 mutex_unlock(&sw->tb->lock);
315 static struct nvmem_device *register_nvmem(struct tb_switch *sw, int id,
316 size_t size, bool active)
318 struct nvmem_config config;
320 memset(&config, 0, sizeof(config));
323 config.name = "nvm_active";
324 config.reg_read = tb_switch_nvm_read;
325 config.read_only = true;
327 config.name = "nvm_non_active";
328 config.reg_read = tb_switch_nvm_no_read;
329 config.reg_write = tb_switch_nvm_write;
330 config.root_only = true;
335 config.word_size = 4;
337 config.dev = &sw->dev;
338 config.owner = THIS_MODULE;
341 return nvmem_register(&config);
344 static int tb_switch_nvm_add(struct tb_switch *sw)
346 struct nvmem_device *nvm_dev;
347 struct tb_switch_nvm *nvm;
354 nvm = kzalloc(sizeof(*nvm), GFP_KERNEL);
358 nvm->id = ida_simple_get(&nvm_ida, 0, 0, GFP_KERNEL);
361 * If the switch is in safe-mode the only accessible portion of
362 * the NVM is the non-active one where userspace is expected to
363 * write new functional NVM.
365 if (!sw->safe_mode) {
366 u32 nvm_size, hdr_size;
368 ret = dma_port_flash_read(sw->dma_port, NVM_FLASH_SIZE, &val,
373 hdr_size = sw->generation < 3 ? SZ_8K : SZ_16K;
374 nvm_size = (SZ_1M << (val & 7)) / 8;
375 nvm_size = (nvm_size - hdr_size) / 2;
377 ret = dma_port_flash_read(sw->dma_port, NVM_VERSION, &val,
382 nvm->major = val >> 16;
383 nvm->minor = val >> 8;
385 nvm_dev = register_nvmem(sw, nvm->id, nvm_size, true);
386 if (IS_ERR(nvm_dev)) {
387 ret = PTR_ERR(nvm_dev);
390 nvm->active = nvm_dev;
393 if (!sw->no_nvm_upgrade) {
394 nvm_dev = register_nvmem(sw, nvm->id, NVM_MAX_SIZE, false);
395 if (IS_ERR(nvm_dev)) {
396 ret = PTR_ERR(nvm_dev);
399 nvm->non_active = nvm_dev;
407 nvmem_unregister(nvm->active);
409 ida_simple_remove(&nvm_ida, nvm->id);
415 static void tb_switch_nvm_remove(struct tb_switch *sw)
417 struct tb_switch_nvm *nvm;
425 /* Remove authentication status in case the switch is unplugged */
426 if (!nvm->authenticating)
427 nvm_clear_auth_status(sw);
430 nvmem_unregister(nvm->non_active);
432 nvmem_unregister(nvm->active);
433 ida_simple_remove(&nvm_ida, nvm->id);
438 /* port utility functions */
440 static const char *tb_port_type(struct tb_regs_port_header *port)
442 switch (port->type >> 16) {
444 switch ((u8) port->type) {
469 static void tb_dump_port(struct tb *tb, struct tb_regs_port_header *port)
472 " Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n",
473 port->port_number, port->vendor_id, port->device_id,
474 port->revision, port->thunderbolt_version, tb_port_type(port),
476 tb_dbg(tb, " Max hop id (in/out): %d/%d\n",
477 port->max_in_hop_id, port->max_out_hop_id);
478 tb_dbg(tb, " Max counters: %d\n", port->max_counters);
479 tb_dbg(tb, " NFC Credits: %#x\n", port->nfc_credits);
483 * tb_port_state() - get connectedness state of a port
485 * The port must have a TB_CAP_PHY (i.e. it should be a real port).
487 * Return: Returns an enum tb_port_state on success or an error code on failure.
489 static int tb_port_state(struct tb_port *port)
491 struct tb_cap_phy phy;
493 if (port->cap_phy == 0) {
494 tb_port_WARN(port, "does not have a PHY\n");
497 res = tb_port_read(port, &phy, TB_CFG_PORT, port->cap_phy, 2);
504 * tb_wait_for_port() - wait for a port to become ready
506 * Wait up to 1 second for a port to reach state TB_PORT_UP. If
507 * wait_if_unplugged is set then we also wait if the port is in state
508 * TB_PORT_UNPLUGGED (it takes a while for the device to be registered after
509 * switch resume). Otherwise we only wait if a device is registered but the link
510 * has not yet been established.
512 * Return: Returns an error code on failure. Returns 0 if the port is not
513 * connected or failed to reach state TB_PORT_UP within one second. Returns 1
514 * if the port is connected and in state TB_PORT_UP.
516 int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged)
520 if (!port->cap_phy) {
521 tb_port_WARN(port, "does not have PHY\n");
524 if (tb_is_upstream_port(port)) {
525 tb_port_WARN(port, "is the upstream port\n");
530 state = tb_port_state(port);
533 if (state == TB_PORT_DISABLED) {
534 tb_port_dbg(port, "is disabled (state: 0)\n");
537 if (state == TB_PORT_UNPLUGGED) {
538 if (wait_if_unplugged) {
539 /* used during resume */
541 "is unplugged (state: 7), retrying...\n");
545 tb_port_dbg(port, "is unplugged (state: 7)\n");
548 if (state == TB_PORT_UP) {
549 tb_port_dbg(port, "is connected, link is up (state: 2)\n");
554 * After plug-in the state is TB_PORT_CONNECTING. Give it some
558 "is connected, link is not up (state: %d), retrying...\n",
563 "failed to reach state TB_PORT_UP. Ignoring port...\n");
568 * tb_port_add_nfc_credits() - add/remove non flow controlled credits to port
570 * Change the number of NFC credits allocated to @port by @credits. To remove
571 * NFC credits pass a negative amount of credits.
573 * Return: Returns 0 on success or an error code on failure.
575 int tb_port_add_nfc_credits(struct tb_port *port, int credits)
579 if (credits == 0 || port->sw->is_unplugged)
582 nfc_credits = port->config.nfc_credits & TB_PORT_NFC_CREDITS_MASK;
583 nfc_credits += credits;
585 tb_port_dbg(port, "adding %d NFC credits to %lu",
586 credits, port->config.nfc_credits & TB_PORT_NFC_CREDITS_MASK);
588 port->config.nfc_credits &= ~TB_PORT_NFC_CREDITS_MASK;
589 port->config.nfc_credits |= nfc_credits;
591 return tb_port_write(port, &port->config.nfc_credits,
596 * tb_port_set_initial_credits() - Set initial port link credits allocated
597 * @port: Port to set the initial credits
598 * @credits: Number of credits to to allocate
600 * Set initial credits value to be used for ingress shared buffering.
602 int tb_port_set_initial_credits(struct tb_port *port, u32 credits)
607 ret = tb_port_read(port, &data, TB_CFG_PORT, 5, 1);
611 data &= ~TB_PORT_LCA_MASK;
612 data |= (credits << TB_PORT_LCA_SHIFT) & TB_PORT_LCA_MASK;
614 return tb_port_write(port, &data, TB_CFG_PORT, 5, 1);
618 * tb_port_clear_counter() - clear a counter in TB_CFG_COUNTER
620 * Return: Returns 0 on success or an error code on failure.
622 int tb_port_clear_counter(struct tb_port *port, int counter)
624 u32 zero[3] = { 0, 0, 0 };
625 tb_port_dbg(port, "clearing counter %d\n", counter);
626 return tb_port_write(port, zero, TB_CFG_COUNTERS, 3 * counter, 3);
630 * tb_init_port() - initialize a port
632 * This is a helper method for tb_switch_alloc. Does not check or initialize
633 * any downstream switches.
635 * Return: Returns 0 on success or an error code on failure.
637 static int tb_init_port(struct tb_port *port)
642 res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8);
644 if (res == -ENODEV) {
645 tb_dbg(port->sw->tb, " Port %d: not implemented\n",
652 /* Port 0 is the switch itself and has no PHY. */
653 if (port->config.type == TB_TYPE_PORT && port->port != 0) {
654 cap = tb_port_find_cap(port, TB_PORT_CAP_PHY);
659 tb_port_WARN(port, "non switch port without a PHY\n");
660 } else if (port->port != 0) {
661 cap = tb_port_find_cap(port, TB_PORT_CAP_ADAP);
663 port->cap_adap = cap;
666 tb_dump_port(port->sw->tb, &port->config);
668 /* Control port does not need HopID allocation */
670 ida_init(&port->in_hopids);
671 ida_init(&port->out_hopids);
678 static int tb_port_alloc_hopid(struct tb_port *port, bool in, int min_hopid,
685 port_max_hopid = port->config.max_in_hop_id;
686 ida = &port->in_hopids;
688 port_max_hopid = port->config.max_out_hop_id;
689 ida = &port->out_hopids;
692 /* HopIDs 0-7 are reserved */
693 if (min_hopid < TB_PATH_MIN_HOPID)
694 min_hopid = TB_PATH_MIN_HOPID;
696 if (max_hopid < 0 || max_hopid > port_max_hopid)
697 max_hopid = port_max_hopid;
699 return ida_simple_get(ida, min_hopid, max_hopid + 1, GFP_KERNEL);
703 * tb_port_alloc_in_hopid() - Allocate input HopID from port
704 * @port: Port to allocate HopID for
705 * @min_hopid: Minimum acceptable input HopID
706 * @max_hopid: Maximum acceptable input HopID
708 * Return: HopID between @min_hopid and @max_hopid or negative errno in
711 int tb_port_alloc_in_hopid(struct tb_port *port, int min_hopid, int max_hopid)
713 return tb_port_alloc_hopid(port, true, min_hopid, max_hopid);
717 * tb_port_alloc_out_hopid() - Allocate output HopID from port
718 * @port: Port to allocate HopID for
719 * @min_hopid: Minimum acceptable output HopID
720 * @max_hopid: Maximum acceptable output HopID
722 * Return: HopID between @min_hopid and @max_hopid or negative errno in
725 int tb_port_alloc_out_hopid(struct tb_port *port, int min_hopid, int max_hopid)
727 return tb_port_alloc_hopid(port, false, min_hopid, max_hopid);
731 * tb_port_release_in_hopid() - Release allocated input HopID from port
732 * @port: Port whose HopID to release
733 * @hopid: HopID to release
735 void tb_port_release_in_hopid(struct tb_port *port, int hopid)
737 ida_simple_remove(&port->in_hopids, hopid);
741 * tb_port_release_out_hopid() - Release allocated output HopID from port
742 * @port: Port whose HopID to release
743 * @hopid: HopID to release
745 void tb_port_release_out_hopid(struct tb_port *port, int hopid)
747 ida_simple_remove(&port->out_hopids, hopid);
751 * tb_next_port_on_path() - Return next port for given port on a path
752 * @start: Start port of the walk
753 * @end: End port of the walk
754 * @prev: Previous port (%NULL if this is the first)
756 * This function can be used to walk from one port to another if they
757 * are connected through zero or more switches. If the @prev is dual
758 * link port, the function follows that link and returns another end on
761 * If the @end port has been reached, return %NULL.
763 * Domain tb->lock must be held when this function is called.
765 struct tb_port *tb_next_port_on_path(struct tb_port *start, struct tb_port *end,
766 struct tb_port *prev)
768 struct tb_port *next;
773 if (prev->sw == end->sw) {
779 if (start->sw->config.depth < end->sw->config.depth) {
781 prev->remote->sw->config.depth > prev->sw->config.depth)
784 next = tb_port_at(tb_route(end->sw), prev->sw);
786 if (tb_is_upstream_port(prev)) {
789 next = tb_upstream_port(prev->sw);
791 * Keep the same link if prev and next are both
794 if (next->dual_link_port &&
795 next->link_nr != prev->link_nr) {
796 next = next->dual_link_port;
805 * tb_port_is_enabled() - Is the adapter port enabled
806 * @port: Port to check
808 bool tb_port_is_enabled(struct tb_port *port)
810 switch (port->config.type) {
811 case TB_TYPE_PCIE_UP:
812 case TB_TYPE_PCIE_DOWN:
813 return tb_pci_port_is_enabled(port);
815 case TB_TYPE_DP_HDMI_IN:
816 case TB_TYPE_DP_HDMI_OUT:
817 return tb_dp_port_is_enabled(port);
825 * tb_pci_port_is_enabled() - Is the PCIe adapter port enabled
826 * @port: PCIe port to check
828 bool tb_pci_port_is_enabled(struct tb_port *port)
832 if (tb_port_read(port, &data, TB_CFG_PORT, port->cap_adap, 1))
835 return !!(data & TB_PCI_EN);
839 * tb_pci_port_enable() - Enable PCIe adapter port
840 * @port: PCIe port to enable
841 * @enable: Enable/disable the PCIe adapter
843 int tb_pci_port_enable(struct tb_port *port, bool enable)
845 u32 word = enable ? TB_PCI_EN : 0x0;
848 return tb_port_write(port, &word, TB_CFG_PORT, port->cap_adap, 1);
852 * tb_dp_port_hpd_is_active() - Is HPD already active
853 * @port: DP out port to check
855 * Checks if the DP OUT adapter port has HDP bit already set.
857 int tb_dp_port_hpd_is_active(struct tb_port *port)
862 ret = tb_port_read(port, &data, TB_CFG_PORT, port->cap_adap + 2, 1);
866 return !!(data & TB_DP_HDP);
870 * tb_dp_port_hpd_clear() - Clear HPD from DP IN port
871 * @port: Port to clear HPD
873 * If the DP IN port has HDP set, this function can be used to clear it.
875 int tb_dp_port_hpd_clear(struct tb_port *port)
880 ret = tb_port_read(port, &data, TB_CFG_PORT, port->cap_adap + 3, 1);
885 return tb_port_write(port, &data, TB_CFG_PORT, port->cap_adap + 3, 1);
889 * tb_dp_port_set_hops() - Set video/aux Hop IDs for DP port
890 * @port: DP IN/OUT port to set hops
891 * @video: Video Hop ID
892 * @aux_tx: AUX TX Hop ID
893 * @aux_rx: AUX RX Hop ID
895 * Programs specified Hop IDs for DP IN/OUT port.
897 int tb_dp_port_set_hops(struct tb_port *port, unsigned int video,
898 unsigned int aux_tx, unsigned int aux_rx)
903 ret = tb_port_read(port, data, TB_CFG_PORT, port->cap_adap,
908 data[0] &= ~TB_DP_VIDEO_HOPID_MASK;
909 data[1] &= ~(TB_DP_AUX_RX_HOPID_MASK | TB_DP_AUX_TX_HOPID_MASK);
911 data[0] |= (video << TB_DP_VIDEO_HOPID_SHIFT) & TB_DP_VIDEO_HOPID_MASK;
912 data[1] |= aux_tx & TB_DP_AUX_TX_HOPID_MASK;
913 data[1] |= (aux_rx << TB_DP_AUX_RX_HOPID_SHIFT) & TB_DP_AUX_RX_HOPID_MASK;
915 return tb_port_write(port, data, TB_CFG_PORT, port->cap_adap,
920 * tb_dp_port_is_enabled() - Is DP adapter port enabled
921 * @port: DP adapter port to check
923 bool tb_dp_port_is_enabled(struct tb_port *port)
927 if (tb_port_read(port, data, TB_CFG_PORT, port->cap_adap,
931 return !!(data[0] & (TB_DP_VIDEO_EN | TB_DP_AUX_EN));
935 * tb_dp_port_enable() - Enables/disables DP paths of a port
936 * @port: DP IN/OUT port
937 * @enable: Enable/disable DP path
939 * Once Hop IDs are programmed DP paths can be enabled or disabled by
940 * calling this function.
942 int tb_dp_port_enable(struct tb_port *port, bool enable)
947 ret = tb_port_read(port, data, TB_CFG_PORT, port->cap_adap,
953 data[0] |= TB_DP_VIDEO_EN | TB_DP_AUX_EN;
955 data[0] &= ~(TB_DP_VIDEO_EN | TB_DP_AUX_EN);
957 return tb_port_write(port, data, TB_CFG_PORT, port->cap_adap,
961 /* switch utility functions */
963 static void tb_dump_switch(struct tb *tb, struct tb_regs_switch_header *sw)
965 tb_dbg(tb, " Switch: %x:%x (Revision: %d, TB Version: %d)\n",
966 sw->vendor_id, sw->device_id, sw->revision,
967 sw->thunderbolt_version);
968 tb_dbg(tb, " Max Port Number: %d\n", sw->max_port_number);
969 tb_dbg(tb, " Config:\n");
971 " Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n",
972 sw->upstream_port_number, sw->depth,
973 (((u64) sw->route_hi) << 32) | sw->route_lo,
974 sw->enabled, sw->plug_events_delay);
975 tb_dbg(tb, " unknown1: %#x unknown4: %#x\n",
976 sw->__unknown1, sw->__unknown4);
980 * reset_switch() - reconfigure route, enable and send TB_CFG_PKG_RESET
982 * Return: Returns 0 on success or an error code on failure.
984 int tb_switch_reset(struct tb *tb, u64 route)
986 struct tb_cfg_result res;
987 struct tb_regs_switch_header header = {
988 header.route_hi = route >> 32,
989 header.route_lo = route,
990 header.enabled = true,
992 tb_dbg(tb, "resetting switch at %llx\n", route);
993 res.err = tb_cfg_write(tb->ctl, ((u32 *) &header) + 2, route,
997 res = tb_cfg_reset(tb->ctl, route, TB_CFG_DEFAULT_TIMEOUT);
1004 * tb_plug_events_active() - enable/disable plug events on a switch
1006 * Also configures a sane plug_events_delay of 255ms.
1008 * Return: Returns 0 on success or an error code on failure.
1010 static int tb_plug_events_active(struct tb_switch *sw, bool active)
1015 if (!sw->config.enabled)
1018 sw->config.plug_events_delay = 0xff;
1019 res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1);
1023 res = tb_sw_read(sw, &data, TB_CFG_SWITCH, sw->cap_plug_events + 1, 1);
1028 data = data & 0xFFFFFF83;
1029 switch (sw->config.device_id) {
1030 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
1031 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
1032 case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
1040 return tb_sw_write(sw, &data, TB_CFG_SWITCH,
1041 sw->cap_plug_events + 1, 1);
1044 static ssize_t authorized_show(struct device *dev,
1045 struct device_attribute *attr,
1048 struct tb_switch *sw = tb_to_switch(dev);
1050 return sprintf(buf, "%u\n", sw->authorized);
1053 static int tb_switch_set_authorized(struct tb_switch *sw, unsigned int val)
1057 if (!mutex_trylock(&sw->tb->lock))
1058 return restart_syscall();
1064 /* Approve switch */
1067 ret = tb_domain_approve_switch_key(sw->tb, sw);
1069 ret = tb_domain_approve_switch(sw->tb, sw);
1072 /* Challenge switch */
1075 ret = tb_domain_challenge_switch_key(sw->tb, sw);
1083 sw->authorized = val;
1084 /* Notify status change to the userspace */
1085 kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE);
1089 mutex_unlock(&sw->tb->lock);
1093 static ssize_t authorized_store(struct device *dev,
1094 struct device_attribute *attr,
1095 const char *buf, size_t count)
1097 struct tb_switch *sw = tb_to_switch(dev);
1101 ret = kstrtouint(buf, 0, &val);
1107 pm_runtime_get_sync(&sw->dev);
1108 ret = tb_switch_set_authorized(sw, val);
1109 pm_runtime_mark_last_busy(&sw->dev);
1110 pm_runtime_put_autosuspend(&sw->dev);
1112 return ret ? ret : count;
1114 static DEVICE_ATTR_RW(authorized);
1116 static ssize_t boot_show(struct device *dev, struct device_attribute *attr,
1119 struct tb_switch *sw = tb_to_switch(dev);
1121 return sprintf(buf, "%u\n", sw->boot);
1123 static DEVICE_ATTR_RO(boot);
1125 static ssize_t device_show(struct device *dev, struct device_attribute *attr,
1128 struct tb_switch *sw = tb_to_switch(dev);
1130 return sprintf(buf, "%#x\n", sw->device);
1132 static DEVICE_ATTR_RO(device);
1135 device_name_show(struct device *dev, struct device_attribute *attr, char *buf)
1137 struct tb_switch *sw = tb_to_switch(dev);
1139 return sprintf(buf, "%s\n", sw->device_name ? sw->device_name : "");
1141 static DEVICE_ATTR_RO(device_name);
1143 static ssize_t key_show(struct device *dev, struct device_attribute *attr,
1146 struct tb_switch *sw = tb_to_switch(dev);
1149 if (!mutex_trylock(&sw->tb->lock))
1150 return restart_syscall();
1153 ret = sprintf(buf, "%*phN\n", TB_SWITCH_KEY_SIZE, sw->key);
1155 ret = sprintf(buf, "\n");
1157 mutex_unlock(&sw->tb->lock);
1161 static ssize_t key_store(struct device *dev, struct device_attribute *attr,
1162 const char *buf, size_t count)
1164 struct tb_switch *sw = tb_to_switch(dev);
1165 u8 key[TB_SWITCH_KEY_SIZE];
1166 ssize_t ret = count;
1169 if (!strcmp(buf, "\n"))
1171 else if (hex2bin(key, buf, sizeof(key)))
1174 if (!mutex_trylock(&sw->tb->lock))
1175 return restart_syscall();
1177 if (sw->authorized) {
1184 sw->key = kmemdup(key, sizeof(key), GFP_KERNEL);
1190 mutex_unlock(&sw->tb->lock);
1193 static DEVICE_ATTR(key, 0600, key_show, key_store);
1195 static void nvm_authenticate_start(struct tb_switch *sw)
1197 struct pci_dev *root_port;
1200 * During host router NVM upgrade we should not allow root port to
1201 * go into D3cold because some root ports cannot trigger PME
1202 * itself. To be on the safe side keep the root port in D0 during
1203 * the whole upgrade process.
1205 root_port = pci_find_pcie_root_port(sw->tb->nhi->pdev);
1207 pm_runtime_get_noresume(&root_port->dev);
1210 static void nvm_authenticate_complete(struct tb_switch *sw)
1212 struct pci_dev *root_port;
1214 root_port = pci_find_pcie_root_port(sw->tb->nhi->pdev);
1216 pm_runtime_put(&root_port->dev);
1219 static ssize_t nvm_authenticate_show(struct device *dev,
1220 struct device_attribute *attr, char *buf)
1222 struct tb_switch *sw = tb_to_switch(dev);
1225 nvm_get_auth_status(sw, &status);
1226 return sprintf(buf, "%#x\n", status);
1229 static ssize_t nvm_authenticate_store(struct device *dev,
1230 struct device_attribute *attr, const char *buf, size_t count)
1232 struct tb_switch *sw = tb_to_switch(dev);
1236 pm_runtime_get_sync(&sw->dev);
1238 if (!mutex_trylock(&sw->tb->lock)) {
1239 ret = restart_syscall();
1243 /* If NVMem devices are not yet added */
1249 ret = kstrtobool(buf, &val);
1253 /* Always clear the authentication status */
1254 nvm_clear_auth_status(sw);
1257 if (!sw->nvm->buf) {
1262 ret = nvm_validate_and_write(sw);
1266 sw->nvm->authenticating = true;
1268 if (!tb_route(sw)) {
1270 * Keep root port from suspending as long as the
1271 * NVM upgrade process is running.
1273 nvm_authenticate_start(sw);
1274 ret = nvm_authenticate_host(sw);
1276 ret = nvm_authenticate_device(sw);
1281 mutex_unlock(&sw->tb->lock);
1283 pm_runtime_mark_last_busy(&sw->dev);
1284 pm_runtime_put_autosuspend(&sw->dev);
1290 static DEVICE_ATTR_RW(nvm_authenticate);
1292 static ssize_t nvm_version_show(struct device *dev,
1293 struct device_attribute *attr, char *buf)
1295 struct tb_switch *sw = tb_to_switch(dev);
1298 if (!mutex_trylock(&sw->tb->lock))
1299 return restart_syscall();
1306 ret = sprintf(buf, "%x.%x\n", sw->nvm->major, sw->nvm->minor);
1308 mutex_unlock(&sw->tb->lock);
1312 static DEVICE_ATTR_RO(nvm_version);
1314 static ssize_t vendor_show(struct device *dev, struct device_attribute *attr,
1317 struct tb_switch *sw = tb_to_switch(dev);
1319 return sprintf(buf, "%#x\n", sw->vendor);
1321 static DEVICE_ATTR_RO(vendor);
1324 vendor_name_show(struct device *dev, struct device_attribute *attr, char *buf)
1326 struct tb_switch *sw = tb_to_switch(dev);
1328 return sprintf(buf, "%s\n", sw->vendor_name ? sw->vendor_name : "");
1330 static DEVICE_ATTR_RO(vendor_name);
1332 static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr,
1335 struct tb_switch *sw = tb_to_switch(dev);
1337 return sprintf(buf, "%pUb\n", sw->uuid);
1339 static DEVICE_ATTR_RO(unique_id);
1341 static struct attribute *switch_attrs[] = {
1342 &dev_attr_authorized.attr,
1343 &dev_attr_boot.attr,
1344 &dev_attr_device.attr,
1345 &dev_attr_device_name.attr,
1347 &dev_attr_nvm_authenticate.attr,
1348 &dev_attr_nvm_version.attr,
1349 &dev_attr_vendor.attr,
1350 &dev_attr_vendor_name.attr,
1351 &dev_attr_unique_id.attr,
1355 static umode_t switch_attr_is_visible(struct kobject *kobj,
1356 struct attribute *attr, int n)
1358 struct device *dev = container_of(kobj, struct device, kobj);
1359 struct tb_switch *sw = tb_to_switch(dev);
1361 if (attr == &dev_attr_device.attr) {
1364 } else if (attr == &dev_attr_device_name.attr) {
1365 if (!sw->device_name)
1367 } else if (attr == &dev_attr_vendor.attr) {
1370 } else if (attr == &dev_attr_vendor_name.attr) {
1371 if (!sw->vendor_name)
1373 } else if (attr == &dev_attr_key.attr) {
1375 sw->tb->security_level == TB_SECURITY_SECURE &&
1376 sw->security_level == TB_SECURITY_SECURE)
1379 } else if (attr == &dev_attr_nvm_authenticate.attr) {
1380 if (sw->dma_port && !sw->no_nvm_upgrade)
1383 } else if (attr == &dev_attr_nvm_version.attr) {
1387 } else if (attr == &dev_attr_boot.attr) {
1393 return sw->safe_mode ? 0 : attr->mode;
1396 static struct attribute_group switch_group = {
1397 .is_visible = switch_attr_is_visible,
1398 .attrs = switch_attrs,
1401 static const struct attribute_group *switch_groups[] = {
1406 static void tb_switch_release(struct device *dev)
1408 struct tb_switch *sw = tb_to_switch(dev);
1411 dma_port_free(sw->dma_port);
1413 for (i = 1; i <= sw->config.max_port_number; i++) {
1414 if (!sw->ports[i].disabled) {
1415 ida_destroy(&sw->ports[i].in_hopids);
1416 ida_destroy(&sw->ports[i].out_hopids);
1421 kfree(sw->device_name);
1422 kfree(sw->vendor_name);
1430 * Currently only need to provide the callbacks. Everything else is handled
1431 * in the connection manager.
1433 static int __maybe_unused tb_switch_runtime_suspend(struct device *dev)
1435 struct tb_switch *sw = tb_to_switch(dev);
1436 const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
1438 if (cm_ops->runtime_suspend_switch)
1439 return cm_ops->runtime_suspend_switch(sw);
1444 static int __maybe_unused tb_switch_runtime_resume(struct device *dev)
1446 struct tb_switch *sw = tb_to_switch(dev);
1447 const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
1449 if (cm_ops->runtime_resume_switch)
1450 return cm_ops->runtime_resume_switch(sw);
1454 static const struct dev_pm_ops tb_switch_pm_ops = {
1455 SET_RUNTIME_PM_OPS(tb_switch_runtime_suspend, tb_switch_runtime_resume,
1459 struct device_type tb_switch_type = {
1460 .name = "thunderbolt_device",
1461 .release = tb_switch_release,
1462 .pm = &tb_switch_pm_ops,
1465 static int tb_switch_get_generation(struct tb_switch *sw)
1467 switch (sw->config.device_id) {
1468 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
1469 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
1470 case PCI_DEVICE_ID_INTEL_LIGHT_PEAK:
1471 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_2C:
1472 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C:
1473 case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
1474 case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_2C_BRIDGE:
1475 case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_4C_BRIDGE:
1478 case PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_BRIDGE:
1479 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE:
1480 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE:
1483 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE:
1484 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_BRIDGE:
1485 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_BRIDGE:
1486 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE:
1487 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE:
1488 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_BRIDGE:
1489 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_BRIDGE:
1490 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_BRIDGE:
1491 case PCI_DEVICE_ID_INTEL_ICL_NHI0:
1492 case PCI_DEVICE_ID_INTEL_ICL_NHI1:
1497 * For unknown switches assume generation to be 1 to be
1500 tb_sw_warn(sw, "unsupported switch device id %#x\n",
1501 sw->config.device_id);
1507 * tb_switch_alloc() - allocate a switch
1508 * @tb: Pointer to the owning domain
1509 * @parent: Parent device for this switch
1510 * @route: Route string for this switch
1512 * Allocates and initializes a switch. Will not upload configuration to
1513 * the switch. For that you need to call tb_switch_configure()
1514 * separately. The returned switch should be released by calling
1517 * Return: Pointer to the allocated switch or ERR_PTR() in case of
1520 struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,
1523 struct tb_switch *sw;
1527 /* Make sure we do not exceed maximum topology limit */
1528 depth = tb_route_length(route);
1529 if (depth > TB_SWITCH_MAX_DEPTH)
1530 return ERR_PTR(-EADDRNOTAVAIL);
1532 upstream_port = tb_cfg_get_upstream_port(tb->ctl, route);
1533 if (upstream_port < 0)
1534 return ERR_PTR(upstream_port);
1536 sw = kzalloc(sizeof(*sw), GFP_KERNEL);
1538 return ERR_PTR(-ENOMEM);
1541 ret = tb_cfg_read(tb->ctl, &sw->config, route, 0, TB_CFG_SWITCH, 0, 5);
1543 goto err_free_sw_ports;
1545 tb_dbg(tb, "current switch config:\n");
1546 tb_dump_switch(tb, &sw->config);
1548 /* configure switch */
1549 sw->config.upstream_port_number = upstream_port;
1550 sw->config.depth = depth;
1551 sw->config.route_hi = upper_32_bits(route);
1552 sw->config.route_lo = lower_32_bits(route);
1553 sw->config.enabled = 0;
1555 /* initialize ports */
1556 sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports),
1560 goto err_free_sw_ports;
1563 for (i = 0; i <= sw->config.max_port_number; i++) {
1564 /* minimum setup for tb_find_cap and tb_drom_read to work */
1565 sw->ports[i].sw = sw;
1566 sw->ports[i].port = i;
1569 sw->generation = tb_switch_get_generation(sw);
1571 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_PLUG_EVENTS);
1573 tb_sw_warn(sw, "cannot find TB_VSE_CAP_PLUG_EVENTS aborting\n");
1574 goto err_free_sw_ports;
1576 sw->cap_plug_events = ret;
1578 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_LINK_CONTROLLER);
1582 /* Root switch is always authorized */
1584 sw->authorized = true;
1586 device_initialize(&sw->dev);
1587 sw->dev.parent = parent;
1588 sw->dev.bus = &tb_bus_type;
1589 sw->dev.type = &tb_switch_type;
1590 sw->dev.groups = switch_groups;
1591 dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
1599 return ERR_PTR(ret);
1603 * tb_switch_alloc_safe_mode() - allocate a switch that is in safe mode
1604 * @tb: Pointer to the owning domain
1605 * @parent: Parent device for this switch
1606 * @route: Route string for this switch
1608 * This creates a switch in safe mode. This means the switch pretty much
1609 * lacks all capabilities except DMA configuration port before it is
1610 * flashed with a valid NVM firmware.
1612 * The returned switch must be released by calling tb_switch_put().
1614 * Return: Pointer to the allocated switch or ERR_PTR() in case of failure
1617 tb_switch_alloc_safe_mode(struct tb *tb, struct device *parent, u64 route)
1619 struct tb_switch *sw;
1621 sw = kzalloc(sizeof(*sw), GFP_KERNEL);
1623 return ERR_PTR(-ENOMEM);
1626 sw->config.depth = tb_route_length(route);
1627 sw->config.route_hi = upper_32_bits(route);
1628 sw->config.route_lo = lower_32_bits(route);
1629 sw->safe_mode = true;
1631 device_initialize(&sw->dev);
1632 sw->dev.parent = parent;
1633 sw->dev.bus = &tb_bus_type;
1634 sw->dev.type = &tb_switch_type;
1635 sw->dev.groups = switch_groups;
1636 dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
1642 * tb_switch_configure() - Uploads configuration to the switch
1643 * @sw: Switch to configure
1645 * Call this function before the switch is added to the system. It will
1646 * upload configuration to the switch and makes it available for the
1647 * connection manager to use.
1649 * Return: %0 in case of success and negative errno in case of failure
1651 int tb_switch_configure(struct tb_switch *sw)
1653 struct tb *tb = sw->tb;
1657 route = tb_route(sw);
1658 tb_dbg(tb, "initializing Switch at %#llx (depth: %d, up port: %d)\n",
1659 route, tb_route_length(route), sw->config.upstream_port_number);
1661 if (sw->config.vendor_id != PCI_VENDOR_ID_INTEL)
1662 tb_sw_warn(sw, "unknown switch vendor id %#x\n",
1663 sw->config.vendor_id);
1665 sw->config.enabled = 1;
1667 /* upload configuration */
1668 ret = tb_sw_write(sw, 1 + (u32 *)&sw->config, TB_CFG_SWITCH, 1, 3);
1672 ret = tb_lc_configure_link(sw);
1676 return tb_plug_events_active(sw, true);
1679 static int tb_switch_set_uuid(struct tb_switch *sw)
1688 * The newer controllers include fused UUID as part of link
1689 * controller specific registers
1691 ret = tb_lc_read_uuid(sw, uuid);
1694 * ICM generates UUID based on UID and fills the upper
1695 * two words with ones. This is not strictly following
1696 * UUID format but we want to be compatible with it so
1697 * we do the same here.
1699 uuid[0] = sw->uid & 0xffffffff;
1700 uuid[1] = (sw->uid >> 32) & 0xffffffff;
1701 uuid[2] = 0xffffffff;
1702 uuid[3] = 0xffffffff;
1705 sw->uuid = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
1711 static int tb_switch_add_dma_port(struct tb_switch *sw)
1716 switch (sw->generation) {
1718 /* Only root switch can be upgraded */
1724 ret = tb_switch_set_uuid(sw);
1731 * DMA port is the only thing available when the switch
1739 /* Root switch DMA port requires running firmware */
1740 if (!tb_route(sw) && sw->config.enabled)
1743 sw->dma_port = dma_port_alloc(sw);
1747 if (sw->no_nvm_upgrade)
1751 * If there is status already set then authentication failed
1752 * when the dma_port_flash_update_auth() returned. Power cycling
1753 * is not needed (it was done already) so only thing we do here
1754 * is to unblock runtime PM of the root port.
1756 nvm_get_auth_status(sw, &status);
1759 nvm_authenticate_complete(sw);
1764 * Check status of the previous flash authentication. If there
1765 * is one we need to power cycle the switch in any case to make
1766 * it functional again.
1768 ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
1772 /* Now we can allow root port to suspend again */
1774 nvm_authenticate_complete(sw);
1777 tb_sw_info(sw, "switch flash authentication failed\n");
1778 nvm_set_auth_status(sw, status);
1781 tb_sw_info(sw, "power cycling the switch now\n");
1782 dma_port_power_cycle(sw->dma_port);
1785 * We return error here which causes the switch adding failure.
1786 * It should appear back after power cycle is complete.
1792 * tb_switch_add() - Add a switch to the domain
1793 * @sw: Switch to add
1795 * This is the last step in adding switch to the domain. It will read
1796 * identification information from DROM and initializes ports so that
1797 * they can be used to connect other switches. The switch will be
1798 * exposed to the userspace when this function successfully returns. To
1799 * remove and release the switch, call tb_switch_remove().
1801 * Return: %0 in case of success and negative errno in case of failure
1803 int tb_switch_add(struct tb_switch *sw)
1808 * Initialize DMA control port now before we read DROM. Recent
1809 * host controllers have more complete DROM on NVM that includes
1810 * vendor and model identification strings which we then expose
1811 * to the userspace. NVM can be accessed through DMA
1812 * configuration based mailbox.
1814 ret = tb_switch_add_dma_port(sw);
1818 if (!sw->safe_mode) {
1820 ret = tb_drom_read(sw);
1822 tb_sw_warn(sw, "tb_eeprom_read_rom failed\n");
1825 tb_sw_dbg(sw, "uid: %#llx\n", sw->uid);
1827 ret = tb_switch_set_uuid(sw);
1831 for (i = 0; i <= sw->config.max_port_number; i++) {
1832 if (sw->ports[i].disabled) {
1833 tb_port_dbg(&sw->ports[i], "disabled by eeprom\n");
1836 ret = tb_init_port(&sw->ports[i]);
1842 ret = device_add(&sw->dev);
1847 dev_info(&sw->dev, "new device found, vendor=%#x device=%#x\n",
1848 sw->vendor, sw->device);
1849 if (sw->vendor_name && sw->device_name)
1850 dev_info(&sw->dev, "%s %s\n", sw->vendor_name,
1854 ret = tb_switch_nvm_add(sw);
1856 device_del(&sw->dev);
1860 pm_runtime_set_active(&sw->dev);
1862 pm_runtime_set_autosuspend_delay(&sw->dev, TB_AUTOSUSPEND_DELAY);
1863 pm_runtime_use_autosuspend(&sw->dev);
1864 pm_runtime_mark_last_busy(&sw->dev);
1865 pm_runtime_enable(&sw->dev);
1866 pm_request_autosuspend(&sw->dev);
1873 * tb_switch_remove() - Remove and release a switch
1874 * @sw: Switch to remove
1876 * This will remove the switch from the domain and release it after last
1877 * reference count drops to zero. If there are switches connected below
1878 * this switch, they will be removed as well.
1880 void tb_switch_remove(struct tb_switch *sw)
1885 pm_runtime_get_sync(&sw->dev);
1886 pm_runtime_disable(&sw->dev);
1889 /* port 0 is the switch itself and never has a remote */
1890 for (i = 1; i <= sw->config.max_port_number; i++) {
1891 if (tb_port_has_remote(&sw->ports[i])) {
1892 tb_switch_remove(sw->ports[i].remote->sw);
1893 sw->ports[i].remote = NULL;
1894 } else if (sw->ports[i].xdomain) {
1895 tb_xdomain_remove(sw->ports[i].xdomain);
1896 sw->ports[i].xdomain = NULL;
1900 if (!sw->is_unplugged)
1901 tb_plug_events_active(sw, false);
1902 tb_lc_unconfigure_link(sw);
1904 tb_switch_nvm_remove(sw);
1907 dev_info(&sw->dev, "device disconnected\n");
1908 device_unregister(&sw->dev);
1912 * tb_sw_set_unplugged() - set is_unplugged on switch and downstream switches
1914 void tb_sw_set_unplugged(struct tb_switch *sw)
1917 if (sw == sw->tb->root_switch) {
1918 tb_sw_WARN(sw, "cannot unplug root switch\n");
1921 if (sw->is_unplugged) {
1922 tb_sw_WARN(sw, "is_unplugged already set\n");
1925 sw->is_unplugged = true;
1926 for (i = 0; i <= sw->config.max_port_number; i++) {
1927 if (tb_port_has_remote(&sw->ports[i]))
1928 tb_sw_set_unplugged(sw->ports[i].remote->sw);
1929 else if (sw->ports[i].xdomain)
1930 sw->ports[i].xdomain->is_unplugged = true;
1934 int tb_switch_resume(struct tb_switch *sw)
1937 tb_sw_dbg(sw, "resuming switch\n");
1940 * Check for UID of the connected switches except for root
1941 * switch which we assume cannot be removed.
1947 * Check first that we can still read the switch config
1948 * space. It may be that there is now another domain
1951 err = tb_cfg_get_upstream_port(sw->tb->ctl, tb_route(sw));
1953 tb_sw_info(sw, "switch not present anymore\n");
1957 err = tb_drom_read_uid_only(sw, &uid);
1959 tb_sw_warn(sw, "uid read failed\n");
1962 if (sw->uid != uid) {
1964 "changed while suspended (uid %#llx -> %#llx)\n",
1970 /* upload configuration */
1971 err = tb_sw_write(sw, 1 + (u32 *) &sw->config, TB_CFG_SWITCH, 1, 3);
1975 err = tb_lc_configure_link(sw);
1979 err = tb_plug_events_active(sw, true);
1983 /* check for surviving downstream switches */
1984 for (i = 1; i <= sw->config.max_port_number; i++) {
1985 struct tb_port *port = &sw->ports[i];
1987 if (!tb_port_has_remote(port) && !port->xdomain)
1990 if (tb_wait_for_port(port, true) <= 0) {
1992 "lost during suspend, disconnecting\n");
1993 if (tb_port_has_remote(port))
1994 tb_sw_set_unplugged(port->remote->sw);
1995 else if (port->xdomain)
1996 port->xdomain->is_unplugged = true;
1997 } else if (tb_port_has_remote(port)) {
1998 if (tb_switch_resume(port->remote->sw)) {
2000 "lost during suspend, disconnecting\n");
2001 tb_sw_set_unplugged(port->remote->sw);
2008 void tb_switch_suspend(struct tb_switch *sw)
2011 err = tb_plug_events_active(sw, false);
2015 for (i = 1; i <= sw->config.max_port_number; i++) {
2016 if (tb_port_has_remote(&sw->ports[i]))
2017 tb_switch_suspend(sw->ports[i].remote->sw);
2020 tb_lc_set_sleep(sw);
2023 struct tb_sw_lookup {
2031 static int tb_switch_match(struct device *dev, const void *data)
2033 struct tb_switch *sw = tb_to_switch(dev);
2034 const struct tb_sw_lookup *lookup = data;
2038 if (sw->tb != lookup->tb)
2042 return !memcmp(sw->uuid, lookup->uuid, sizeof(*lookup->uuid));
2044 if (lookup->route) {
2045 return sw->config.route_lo == lower_32_bits(lookup->route) &&
2046 sw->config.route_hi == upper_32_bits(lookup->route);
2049 /* Root switch is matched only by depth */
2053 return sw->link == lookup->link && sw->depth == lookup->depth;
2057 * tb_switch_find_by_link_depth() - Find switch by link and depth
2058 * @tb: Domain the switch belongs
2059 * @link: Link number the switch is connected
2060 * @depth: Depth of the switch in link
2062 * Returned switch has reference count increased so the caller needs to
2063 * call tb_switch_put() when done with the switch.
2065 struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link, u8 depth)
2067 struct tb_sw_lookup lookup;
2070 memset(&lookup, 0, sizeof(lookup));
2073 lookup.depth = depth;
2075 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
2077 return tb_to_switch(dev);
2083 * tb_switch_find_by_uuid() - Find switch by UUID
2084 * @tb: Domain the switch belongs
2085 * @uuid: UUID to look for
2087 * Returned switch has reference count increased so the caller needs to
2088 * call tb_switch_put() when done with the switch.
2090 struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_t *uuid)
2092 struct tb_sw_lookup lookup;
2095 memset(&lookup, 0, sizeof(lookup));
2099 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
2101 return tb_to_switch(dev);
2107 * tb_switch_find_by_route() - Find switch by route string
2108 * @tb: Domain the switch belongs
2109 * @route: Route string to look for
2111 * Returned switch has reference count increased so the caller needs to
2112 * call tb_switch_put() when done with the switch.
2114 struct tb_switch *tb_switch_find_by_route(struct tb *tb, u64 route)
2116 struct tb_sw_lookup lookup;
2120 return tb_switch_get(tb->root_switch);
2122 memset(&lookup, 0, sizeof(lookup));
2124 lookup.route = route;
2126 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
2128 return tb_to_switch(dev);
2133 void tb_switch_exit(void)
2135 ida_destroy(&nvm_ida);