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) {
179 ret = tb_domain_disconnect_all_paths(sw->tb);
183 * The host controller goes away pretty soon after this if
184 * everything goes well so getting timeout is expected.
186 ret = dma_port_flash_update_auth(sw->dma_port);
187 return ret == -ETIMEDOUT ? 0 : ret;
191 * From safe mode we can get out by just power cycling the
194 dma_port_power_cycle(sw->dma_port);
198 static int nvm_authenticate_device(struct tb_switch *sw)
200 int ret, retries = 10;
202 ret = dma_port_flash_update_auth(sw->dma_port);
203 if (ret && ret != -ETIMEDOUT)
207 * Poll here for the authentication status. It takes some time
208 * for the device to respond (we get timeout for a while). Once
209 * we get response the device needs to be power cycled in order
210 * to the new NVM to be taken into use.
215 ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
216 if (ret < 0 && ret != -ETIMEDOUT)
220 tb_sw_warn(sw, "failed to authenticate NVM\n");
221 nvm_set_auth_status(sw, status);
224 tb_sw_info(sw, "power cycling the switch now\n");
225 dma_port_power_cycle(sw->dma_port);
235 static int tb_switch_nvm_read(void *priv, unsigned int offset, void *val,
238 struct tb_switch *sw = priv;
241 pm_runtime_get_sync(&sw->dev);
243 if (!mutex_trylock(&sw->tb->lock)) {
244 ret = restart_syscall();
248 ret = dma_port_flash_read(sw->dma_port, offset, val, bytes);
249 mutex_unlock(&sw->tb->lock);
252 pm_runtime_mark_last_busy(&sw->dev);
253 pm_runtime_put_autosuspend(&sw->dev);
258 static int tb_switch_nvm_write(void *priv, unsigned int offset, void *val,
261 struct tb_switch *sw = priv;
264 if (!mutex_trylock(&sw->tb->lock))
265 return restart_syscall();
268 * Since writing the NVM image might require some special steps,
269 * for example when CSS headers are written, we cache the image
270 * locally here and handle the special cases when the user asks
271 * us to authenticate the image.
274 sw->nvm->buf = vmalloc(NVM_MAX_SIZE);
281 sw->nvm->buf_data_size = offset + bytes;
282 memcpy(sw->nvm->buf + offset, val, bytes);
285 mutex_unlock(&sw->tb->lock);
290 static struct nvmem_device *register_nvmem(struct tb_switch *sw, int id,
291 size_t size, bool active)
293 struct nvmem_config config;
295 memset(&config, 0, sizeof(config));
298 config.name = "nvm_active";
299 config.reg_read = tb_switch_nvm_read;
300 config.read_only = true;
302 config.name = "nvm_non_active";
303 config.reg_write = tb_switch_nvm_write;
304 config.root_only = true;
309 config.word_size = 4;
311 config.dev = &sw->dev;
312 config.owner = THIS_MODULE;
315 return nvmem_register(&config);
318 static int tb_switch_nvm_add(struct tb_switch *sw)
320 struct nvmem_device *nvm_dev;
321 struct tb_switch_nvm *nvm;
328 nvm = kzalloc(sizeof(*nvm), GFP_KERNEL);
332 nvm->id = ida_simple_get(&nvm_ida, 0, 0, GFP_KERNEL);
335 * If the switch is in safe-mode the only accessible portion of
336 * the NVM is the non-active one where userspace is expected to
337 * write new functional NVM.
339 if (!sw->safe_mode) {
340 u32 nvm_size, hdr_size;
342 ret = dma_port_flash_read(sw->dma_port, NVM_FLASH_SIZE, &val,
347 hdr_size = sw->generation < 3 ? SZ_8K : SZ_16K;
348 nvm_size = (SZ_1M << (val & 7)) / 8;
349 nvm_size = (nvm_size - hdr_size) / 2;
351 ret = dma_port_flash_read(sw->dma_port, NVM_VERSION, &val,
356 nvm->major = val >> 16;
357 nvm->minor = val >> 8;
359 nvm_dev = register_nvmem(sw, nvm->id, nvm_size, true);
360 if (IS_ERR(nvm_dev)) {
361 ret = PTR_ERR(nvm_dev);
364 nvm->active = nvm_dev;
367 if (!sw->no_nvm_upgrade) {
368 nvm_dev = register_nvmem(sw, nvm->id, NVM_MAX_SIZE, false);
369 if (IS_ERR(nvm_dev)) {
370 ret = PTR_ERR(nvm_dev);
373 nvm->non_active = nvm_dev;
381 nvmem_unregister(nvm->active);
383 ida_simple_remove(&nvm_ida, nvm->id);
389 static void tb_switch_nvm_remove(struct tb_switch *sw)
391 struct tb_switch_nvm *nvm;
399 /* Remove authentication status in case the switch is unplugged */
400 if (!nvm->authenticating)
401 nvm_clear_auth_status(sw);
404 nvmem_unregister(nvm->non_active);
406 nvmem_unregister(nvm->active);
407 ida_simple_remove(&nvm_ida, nvm->id);
412 /* port utility functions */
414 static const char *tb_port_type(struct tb_regs_port_header *port)
416 switch (port->type >> 16) {
418 switch ((u8) port->type) {
443 static void tb_dump_port(struct tb *tb, struct tb_regs_port_header *port)
446 " Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n",
447 port->port_number, port->vendor_id, port->device_id,
448 port->revision, port->thunderbolt_version, tb_port_type(port),
450 tb_dbg(tb, " Max hop id (in/out): %d/%d\n",
451 port->max_in_hop_id, port->max_out_hop_id);
452 tb_dbg(tb, " Max counters: %d\n", port->max_counters);
453 tb_dbg(tb, " NFC Credits: %#x\n", port->nfc_credits);
457 * tb_port_state() - get connectedness state of a port
459 * The port must have a TB_CAP_PHY (i.e. it should be a real port).
461 * Return: Returns an enum tb_port_state on success or an error code on failure.
463 static int tb_port_state(struct tb_port *port)
465 struct tb_cap_phy phy;
467 if (port->cap_phy == 0) {
468 tb_port_WARN(port, "does not have a PHY\n");
471 res = tb_port_read(port, &phy, TB_CFG_PORT, port->cap_phy, 2);
478 * tb_wait_for_port() - wait for a port to become ready
480 * Wait up to 1 second for a port to reach state TB_PORT_UP. If
481 * wait_if_unplugged is set then we also wait if the port is in state
482 * TB_PORT_UNPLUGGED (it takes a while for the device to be registered after
483 * switch resume). Otherwise we only wait if a device is registered but the link
484 * has not yet been established.
486 * Return: Returns an error code on failure. Returns 0 if the port is not
487 * connected or failed to reach state TB_PORT_UP within one second. Returns 1
488 * if the port is connected and in state TB_PORT_UP.
490 int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged)
494 if (!port->cap_phy) {
495 tb_port_WARN(port, "does not have PHY\n");
498 if (tb_is_upstream_port(port)) {
499 tb_port_WARN(port, "is the upstream port\n");
504 state = tb_port_state(port);
507 if (state == TB_PORT_DISABLED) {
508 tb_port_dbg(port, "is disabled (state: 0)\n");
511 if (state == TB_PORT_UNPLUGGED) {
512 if (wait_if_unplugged) {
513 /* used during resume */
515 "is unplugged (state: 7), retrying...\n");
519 tb_port_dbg(port, "is unplugged (state: 7)\n");
522 if (state == TB_PORT_UP) {
523 tb_port_dbg(port, "is connected, link is up (state: 2)\n");
528 * After plug-in the state is TB_PORT_CONNECTING. Give it some
532 "is connected, link is not up (state: %d), retrying...\n",
537 "failed to reach state TB_PORT_UP. Ignoring port...\n");
542 * tb_port_add_nfc_credits() - add/remove non flow controlled credits to port
544 * Change the number of NFC credits allocated to @port by @credits. To remove
545 * NFC credits pass a negative amount of credits.
547 * Return: Returns 0 on success or an error code on failure.
549 int tb_port_add_nfc_credits(struct tb_port *port, int credits)
553 if (credits == 0 || port->sw->is_unplugged)
556 nfc_credits = port->config.nfc_credits & TB_PORT_NFC_CREDITS_MASK;
557 nfc_credits += credits;
559 tb_port_dbg(port, "adding %d NFC credits to %lu",
560 credits, port->config.nfc_credits & TB_PORT_NFC_CREDITS_MASK);
562 port->config.nfc_credits &= ~TB_PORT_NFC_CREDITS_MASK;
563 port->config.nfc_credits |= nfc_credits;
565 return tb_port_write(port, &port->config.nfc_credits,
570 * tb_port_set_initial_credits() - Set initial port link credits allocated
571 * @port: Port to set the initial credits
572 * @credits: Number of credits to to allocate
574 * Set initial credits value to be used for ingress shared buffering.
576 int tb_port_set_initial_credits(struct tb_port *port, u32 credits)
581 ret = tb_port_read(port, &data, TB_CFG_PORT, 5, 1);
585 data &= ~TB_PORT_LCA_MASK;
586 data |= (credits << TB_PORT_LCA_SHIFT) & TB_PORT_LCA_MASK;
588 return tb_port_write(port, &data, TB_CFG_PORT, 5, 1);
592 * tb_port_clear_counter() - clear a counter in TB_CFG_COUNTER
594 * Return: Returns 0 on success or an error code on failure.
596 int tb_port_clear_counter(struct tb_port *port, int counter)
598 u32 zero[3] = { 0, 0, 0 };
599 tb_port_dbg(port, "clearing counter %d\n", counter);
600 return tb_port_write(port, zero, TB_CFG_COUNTERS, 3 * counter, 3);
604 * tb_init_port() - initialize a port
606 * This is a helper method for tb_switch_alloc. Does not check or initialize
607 * any downstream switches.
609 * Return: Returns 0 on success or an error code on failure.
611 static int tb_init_port(struct tb_port *port)
616 res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8);
618 if (res == -ENODEV) {
619 tb_dbg(port->sw->tb, " Port %d: not implemented\n",
626 /* Port 0 is the switch itself and has no PHY. */
627 if (port->config.type == TB_TYPE_PORT && port->port != 0) {
628 cap = tb_port_find_cap(port, TB_PORT_CAP_PHY);
633 tb_port_WARN(port, "non switch port without a PHY\n");
634 } else if (port->port != 0) {
635 cap = tb_port_find_cap(port, TB_PORT_CAP_ADAP);
637 port->cap_adap = cap;
640 tb_dump_port(port->sw->tb, &port->config);
642 /* Control port does not need HopID allocation */
644 ida_init(&port->in_hopids);
645 ida_init(&port->out_hopids);
652 static int tb_port_alloc_hopid(struct tb_port *port, bool in, int min_hopid,
659 port_max_hopid = port->config.max_in_hop_id;
660 ida = &port->in_hopids;
662 port_max_hopid = port->config.max_out_hop_id;
663 ida = &port->out_hopids;
666 /* HopIDs 0-7 are reserved */
667 if (min_hopid < TB_PATH_MIN_HOPID)
668 min_hopid = TB_PATH_MIN_HOPID;
670 if (max_hopid < 0 || max_hopid > port_max_hopid)
671 max_hopid = port_max_hopid;
673 return ida_simple_get(ida, min_hopid, max_hopid + 1, GFP_KERNEL);
677 * tb_port_alloc_in_hopid() - Allocate input HopID from port
678 * @port: Port to allocate HopID for
679 * @min_hopid: Minimum acceptable input HopID
680 * @max_hopid: Maximum acceptable input HopID
682 * Return: HopID between @min_hopid and @max_hopid or negative errno in
685 int tb_port_alloc_in_hopid(struct tb_port *port, int min_hopid, int max_hopid)
687 return tb_port_alloc_hopid(port, true, min_hopid, max_hopid);
691 * tb_port_alloc_out_hopid() - Allocate output HopID from port
692 * @port: Port to allocate HopID for
693 * @min_hopid: Minimum acceptable output HopID
694 * @max_hopid: Maximum acceptable output HopID
696 * Return: HopID between @min_hopid and @max_hopid or negative errno in
699 int tb_port_alloc_out_hopid(struct tb_port *port, int min_hopid, int max_hopid)
701 return tb_port_alloc_hopid(port, false, min_hopid, max_hopid);
705 * tb_port_release_in_hopid() - Release allocated input HopID from port
706 * @port: Port whose HopID to release
707 * @hopid: HopID to release
709 void tb_port_release_in_hopid(struct tb_port *port, int hopid)
711 ida_simple_remove(&port->in_hopids, hopid);
715 * tb_port_release_out_hopid() - Release allocated output HopID from port
716 * @port: Port whose HopID to release
717 * @hopid: HopID to release
719 void tb_port_release_out_hopid(struct tb_port *port, int hopid)
721 ida_simple_remove(&port->out_hopids, hopid);
725 * tb_next_port_on_path() - Return next port for given port on a path
726 * @start: Start port of the walk
727 * @end: End port of the walk
728 * @prev: Previous port (%NULL if this is the first)
730 * This function can be used to walk from one port to another if they
731 * are connected through zero or more switches. If the @prev is dual
732 * link port, the function follows that link and returns another end on
735 * If the @end port has been reached, return %NULL.
737 * Domain tb->lock must be held when this function is called.
739 struct tb_port *tb_next_port_on_path(struct tb_port *start, struct tb_port *end,
740 struct tb_port *prev)
742 struct tb_port *next;
747 if (prev->sw == end->sw) {
753 if (start->sw->config.depth < end->sw->config.depth) {
755 prev->remote->sw->config.depth > prev->sw->config.depth)
758 next = tb_port_at(tb_route(end->sw), prev->sw);
760 if (tb_is_upstream_port(prev)) {
763 next = tb_upstream_port(prev->sw);
765 * Keep the same link if prev and next are both
768 if (next->dual_link_port &&
769 next->link_nr != prev->link_nr) {
770 next = next->dual_link_port;
779 * tb_port_is_enabled() - Is the adapter port enabled
780 * @port: Port to check
782 bool tb_port_is_enabled(struct tb_port *port)
784 switch (port->config.type) {
785 case TB_TYPE_PCIE_UP:
786 case TB_TYPE_PCIE_DOWN:
787 return tb_pci_port_is_enabled(port);
789 case TB_TYPE_DP_HDMI_IN:
790 case TB_TYPE_DP_HDMI_OUT:
791 return tb_dp_port_is_enabled(port);
799 * tb_pci_port_is_enabled() - Is the PCIe adapter port enabled
800 * @port: PCIe port to check
802 bool tb_pci_port_is_enabled(struct tb_port *port)
806 if (tb_port_read(port, &data, TB_CFG_PORT, port->cap_adap, 1))
809 return !!(data & TB_PCI_EN);
813 * tb_pci_port_enable() - Enable PCIe adapter port
814 * @port: PCIe port to enable
815 * @enable: Enable/disable the PCIe adapter
817 int tb_pci_port_enable(struct tb_port *port, bool enable)
819 u32 word = enable ? TB_PCI_EN : 0x0;
822 return tb_port_write(port, &word, TB_CFG_PORT, port->cap_adap, 1);
826 * tb_dp_port_hpd_is_active() - Is HPD already active
827 * @port: DP out port to check
829 * Checks if the DP OUT adapter port has HDP bit already set.
831 int tb_dp_port_hpd_is_active(struct tb_port *port)
836 ret = tb_port_read(port, &data, TB_CFG_PORT, port->cap_adap + 2, 1);
840 return !!(data & TB_DP_HDP);
844 * tb_dp_port_hpd_clear() - Clear HPD from DP IN port
845 * @port: Port to clear HPD
847 * If the DP IN port has HDP set, this function can be used to clear it.
849 int tb_dp_port_hpd_clear(struct tb_port *port)
854 ret = tb_port_read(port, &data, TB_CFG_PORT, port->cap_adap + 3, 1);
859 return tb_port_write(port, &data, TB_CFG_PORT, port->cap_adap + 3, 1);
863 * tb_dp_port_set_hops() - Set video/aux Hop IDs for DP port
864 * @port: DP IN/OUT port to set hops
865 * @video: Video Hop ID
866 * @aux_tx: AUX TX Hop ID
867 * @aux_rx: AUX RX Hop ID
869 * Programs specified Hop IDs for DP IN/OUT port.
871 int tb_dp_port_set_hops(struct tb_port *port, unsigned int video,
872 unsigned int aux_tx, unsigned int aux_rx)
877 ret = tb_port_read(port, data, TB_CFG_PORT, port->cap_adap,
882 data[0] &= ~TB_DP_VIDEO_HOPID_MASK;
883 data[1] &= ~(TB_DP_AUX_RX_HOPID_MASK | TB_DP_AUX_TX_HOPID_MASK);
885 data[0] |= (video << TB_DP_VIDEO_HOPID_SHIFT) & TB_DP_VIDEO_HOPID_MASK;
886 data[1] |= aux_tx & TB_DP_AUX_TX_HOPID_MASK;
887 data[1] |= (aux_rx << TB_DP_AUX_RX_HOPID_SHIFT) & TB_DP_AUX_RX_HOPID_MASK;
889 return tb_port_write(port, data, TB_CFG_PORT, port->cap_adap,
894 * tb_dp_port_is_enabled() - Is DP adapter port enabled
895 * @port: DP adapter port to check
897 bool tb_dp_port_is_enabled(struct tb_port *port)
901 if (tb_port_read(port, &data, TB_CFG_PORT, port->cap_adap, 1))
904 return !!(data & (TB_DP_VIDEO_EN | TB_DP_AUX_EN));
908 * tb_dp_port_enable() - Enables/disables DP paths of a port
909 * @port: DP IN/OUT port
910 * @enable: Enable/disable DP path
912 * Once Hop IDs are programmed DP paths can be enabled or disabled by
913 * calling this function.
915 int tb_dp_port_enable(struct tb_port *port, bool enable)
920 ret = tb_port_read(port, &data, TB_CFG_PORT, port->cap_adap, 1);
925 data |= TB_DP_VIDEO_EN | TB_DP_AUX_EN;
927 data &= ~(TB_DP_VIDEO_EN | TB_DP_AUX_EN);
929 return tb_port_write(port, &data, TB_CFG_PORT, port->cap_adap, 1);
932 /* switch utility functions */
934 static void tb_dump_switch(struct tb *tb, struct tb_regs_switch_header *sw)
936 tb_dbg(tb, " Switch: %x:%x (Revision: %d, TB Version: %d)\n",
937 sw->vendor_id, sw->device_id, sw->revision,
938 sw->thunderbolt_version);
939 tb_dbg(tb, " Max Port Number: %d\n", sw->max_port_number);
940 tb_dbg(tb, " Config:\n");
942 " Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n",
943 sw->upstream_port_number, sw->depth,
944 (((u64) sw->route_hi) << 32) | sw->route_lo,
945 sw->enabled, sw->plug_events_delay);
946 tb_dbg(tb, " unknown1: %#x unknown4: %#x\n",
947 sw->__unknown1, sw->__unknown4);
951 * reset_switch() - reconfigure route, enable and send TB_CFG_PKG_RESET
953 * Return: Returns 0 on success or an error code on failure.
955 int tb_switch_reset(struct tb *tb, u64 route)
957 struct tb_cfg_result res;
958 struct tb_regs_switch_header header = {
959 header.route_hi = route >> 32,
960 header.route_lo = route,
961 header.enabled = true,
963 tb_dbg(tb, "resetting switch at %llx\n", route);
964 res.err = tb_cfg_write(tb->ctl, ((u32 *) &header) + 2, route,
968 res = tb_cfg_reset(tb->ctl, route, TB_CFG_DEFAULT_TIMEOUT);
975 * tb_plug_events_active() - enable/disable plug events on a switch
977 * Also configures a sane plug_events_delay of 255ms.
979 * Return: Returns 0 on success or an error code on failure.
981 static int tb_plug_events_active(struct tb_switch *sw, bool active)
986 if (!sw->config.enabled)
989 sw->config.plug_events_delay = 0xff;
990 res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1);
994 res = tb_sw_read(sw, &data, TB_CFG_SWITCH, sw->cap_plug_events + 1, 1);
999 data = data & 0xFFFFFF83;
1000 switch (sw->config.device_id) {
1001 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
1002 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
1003 case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
1011 return tb_sw_write(sw, &data, TB_CFG_SWITCH,
1012 sw->cap_plug_events + 1, 1);
1015 static ssize_t authorized_show(struct device *dev,
1016 struct device_attribute *attr,
1019 struct tb_switch *sw = tb_to_switch(dev);
1021 return sprintf(buf, "%u\n", sw->authorized);
1024 static int tb_switch_set_authorized(struct tb_switch *sw, unsigned int val)
1028 if (!mutex_trylock(&sw->tb->lock))
1029 return restart_syscall();
1035 * Make sure there is no PCIe rescan ongoing when a new PCIe
1036 * tunnel is created. Otherwise the PCIe rescan code might find
1037 * the new tunnel too early.
1039 pci_lock_rescan_remove();
1042 /* Approve switch */
1045 ret = tb_domain_approve_switch_key(sw->tb, sw);
1047 ret = tb_domain_approve_switch(sw->tb, sw);
1050 /* Challenge switch */
1053 ret = tb_domain_challenge_switch_key(sw->tb, sw);
1060 pci_unlock_rescan_remove();
1063 sw->authorized = val;
1064 /* Notify status change to the userspace */
1065 kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE);
1069 mutex_unlock(&sw->tb->lock);
1073 static ssize_t authorized_store(struct device *dev,
1074 struct device_attribute *attr,
1075 const char *buf, size_t count)
1077 struct tb_switch *sw = tb_to_switch(dev);
1081 ret = kstrtouint(buf, 0, &val);
1087 pm_runtime_get_sync(&sw->dev);
1088 ret = tb_switch_set_authorized(sw, val);
1089 pm_runtime_mark_last_busy(&sw->dev);
1090 pm_runtime_put_autosuspend(&sw->dev);
1092 return ret ? ret : count;
1094 static DEVICE_ATTR_RW(authorized);
1096 static ssize_t boot_show(struct device *dev, struct device_attribute *attr,
1099 struct tb_switch *sw = tb_to_switch(dev);
1101 return sprintf(buf, "%u\n", sw->boot);
1103 static DEVICE_ATTR_RO(boot);
1105 static ssize_t device_show(struct device *dev, struct device_attribute *attr,
1108 struct tb_switch *sw = tb_to_switch(dev);
1110 return sprintf(buf, "%#x\n", sw->device);
1112 static DEVICE_ATTR_RO(device);
1115 device_name_show(struct device *dev, struct device_attribute *attr, char *buf)
1117 struct tb_switch *sw = tb_to_switch(dev);
1119 return sprintf(buf, "%s\n", sw->device_name ? sw->device_name : "");
1121 static DEVICE_ATTR_RO(device_name);
1123 static ssize_t key_show(struct device *dev, struct device_attribute *attr,
1126 struct tb_switch *sw = tb_to_switch(dev);
1129 if (!mutex_trylock(&sw->tb->lock))
1130 return restart_syscall();
1133 ret = sprintf(buf, "%*phN\n", TB_SWITCH_KEY_SIZE, sw->key);
1135 ret = sprintf(buf, "\n");
1137 mutex_unlock(&sw->tb->lock);
1141 static ssize_t key_store(struct device *dev, struct device_attribute *attr,
1142 const char *buf, size_t count)
1144 struct tb_switch *sw = tb_to_switch(dev);
1145 u8 key[TB_SWITCH_KEY_SIZE];
1146 ssize_t ret = count;
1149 if (!strcmp(buf, "\n"))
1151 else if (hex2bin(key, buf, sizeof(key)))
1154 if (!mutex_trylock(&sw->tb->lock))
1155 return restart_syscall();
1157 if (sw->authorized) {
1164 sw->key = kmemdup(key, sizeof(key), GFP_KERNEL);
1170 mutex_unlock(&sw->tb->lock);
1173 static DEVICE_ATTR(key, 0600, key_show, key_store);
1175 static void nvm_authenticate_start(struct tb_switch *sw)
1177 struct pci_dev *root_port;
1180 * During host router NVM upgrade we should not allow root port to
1181 * go into D3cold because some root ports cannot trigger PME
1182 * itself. To be on the safe side keep the root port in D0 during
1183 * the whole upgrade process.
1185 root_port = pci_find_pcie_root_port(sw->tb->nhi->pdev);
1187 pm_runtime_get_noresume(&root_port->dev);
1190 static void nvm_authenticate_complete(struct tb_switch *sw)
1192 struct pci_dev *root_port;
1194 root_port = pci_find_pcie_root_port(sw->tb->nhi->pdev);
1196 pm_runtime_put(&root_port->dev);
1199 static ssize_t nvm_authenticate_show(struct device *dev,
1200 struct device_attribute *attr, char *buf)
1202 struct tb_switch *sw = tb_to_switch(dev);
1205 nvm_get_auth_status(sw, &status);
1206 return sprintf(buf, "%#x\n", status);
1209 static ssize_t nvm_authenticate_store(struct device *dev,
1210 struct device_attribute *attr, const char *buf, size_t count)
1212 struct tb_switch *sw = tb_to_switch(dev);
1216 pm_runtime_get_sync(&sw->dev);
1218 if (!mutex_trylock(&sw->tb->lock)) {
1219 ret = restart_syscall();
1223 /* If NVMem devices are not yet added */
1229 ret = kstrtobool(buf, &val);
1233 /* Always clear the authentication status */
1234 nvm_clear_auth_status(sw);
1237 if (!sw->nvm->buf) {
1242 ret = nvm_validate_and_write(sw);
1246 sw->nvm->authenticating = true;
1248 if (!tb_route(sw)) {
1250 * Keep root port from suspending as long as the
1251 * NVM upgrade process is running.
1253 nvm_authenticate_start(sw);
1254 ret = nvm_authenticate_host(sw);
1256 nvm_authenticate_complete(sw);
1258 ret = nvm_authenticate_device(sw);
1263 mutex_unlock(&sw->tb->lock);
1265 pm_runtime_mark_last_busy(&sw->dev);
1266 pm_runtime_put_autosuspend(&sw->dev);
1272 static DEVICE_ATTR_RW(nvm_authenticate);
1274 static ssize_t nvm_version_show(struct device *dev,
1275 struct device_attribute *attr, char *buf)
1277 struct tb_switch *sw = tb_to_switch(dev);
1280 if (!mutex_trylock(&sw->tb->lock))
1281 return restart_syscall();
1288 ret = sprintf(buf, "%x.%x\n", sw->nvm->major, sw->nvm->minor);
1290 mutex_unlock(&sw->tb->lock);
1294 static DEVICE_ATTR_RO(nvm_version);
1296 static ssize_t vendor_show(struct device *dev, struct device_attribute *attr,
1299 struct tb_switch *sw = tb_to_switch(dev);
1301 return sprintf(buf, "%#x\n", sw->vendor);
1303 static DEVICE_ATTR_RO(vendor);
1306 vendor_name_show(struct device *dev, struct device_attribute *attr, char *buf)
1308 struct tb_switch *sw = tb_to_switch(dev);
1310 return sprintf(buf, "%s\n", sw->vendor_name ? sw->vendor_name : "");
1312 static DEVICE_ATTR_RO(vendor_name);
1314 static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr,
1317 struct tb_switch *sw = tb_to_switch(dev);
1319 return sprintf(buf, "%pUb\n", sw->uuid);
1321 static DEVICE_ATTR_RO(unique_id);
1323 static struct attribute *switch_attrs[] = {
1324 &dev_attr_authorized.attr,
1325 &dev_attr_boot.attr,
1326 &dev_attr_device.attr,
1327 &dev_attr_device_name.attr,
1329 &dev_attr_nvm_authenticate.attr,
1330 &dev_attr_nvm_version.attr,
1331 &dev_attr_vendor.attr,
1332 &dev_attr_vendor_name.attr,
1333 &dev_attr_unique_id.attr,
1337 static umode_t switch_attr_is_visible(struct kobject *kobj,
1338 struct attribute *attr, int n)
1340 struct device *dev = container_of(kobj, struct device, kobj);
1341 struct tb_switch *sw = tb_to_switch(dev);
1343 if (attr == &dev_attr_device.attr) {
1346 } else if (attr == &dev_attr_device_name.attr) {
1347 if (!sw->device_name)
1349 } else if (attr == &dev_attr_vendor.attr) {
1352 } else if (attr == &dev_attr_vendor_name.attr) {
1353 if (!sw->vendor_name)
1355 } else if (attr == &dev_attr_key.attr) {
1357 sw->tb->security_level == TB_SECURITY_SECURE &&
1358 sw->security_level == TB_SECURITY_SECURE)
1361 } else if (attr == &dev_attr_nvm_authenticate.attr) {
1362 if (sw->dma_port && !sw->no_nvm_upgrade)
1365 } else if (attr == &dev_attr_nvm_version.attr) {
1369 } else if (attr == &dev_attr_boot.attr) {
1375 return sw->safe_mode ? 0 : attr->mode;
1378 static struct attribute_group switch_group = {
1379 .is_visible = switch_attr_is_visible,
1380 .attrs = switch_attrs,
1383 static const struct attribute_group *switch_groups[] = {
1388 static void tb_switch_release(struct device *dev)
1390 struct tb_switch *sw = tb_to_switch(dev);
1393 dma_port_free(sw->dma_port);
1395 for (i = 1; i <= sw->config.max_port_number; i++) {
1396 if (!sw->ports[i].disabled) {
1397 ida_destroy(&sw->ports[i].in_hopids);
1398 ida_destroy(&sw->ports[i].out_hopids);
1403 kfree(sw->device_name);
1404 kfree(sw->vendor_name);
1412 * Currently only need to provide the callbacks. Everything else is handled
1413 * in the connection manager.
1415 static int __maybe_unused tb_switch_runtime_suspend(struct device *dev)
1417 struct tb_switch *sw = tb_to_switch(dev);
1418 const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
1420 if (cm_ops->runtime_suspend_switch)
1421 return cm_ops->runtime_suspend_switch(sw);
1426 static int __maybe_unused tb_switch_runtime_resume(struct device *dev)
1428 struct tb_switch *sw = tb_to_switch(dev);
1429 const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
1431 if (cm_ops->runtime_resume_switch)
1432 return cm_ops->runtime_resume_switch(sw);
1436 static const struct dev_pm_ops tb_switch_pm_ops = {
1437 SET_RUNTIME_PM_OPS(tb_switch_runtime_suspend, tb_switch_runtime_resume,
1441 struct device_type tb_switch_type = {
1442 .name = "thunderbolt_device",
1443 .release = tb_switch_release,
1444 .pm = &tb_switch_pm_ops,
1447 static int tb_switch_get_generation(struct tb_switch *sw)
1449 switch (sw->config.device_id) {
1450 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
1451 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
1452 case PCI_DEVICE_ID_INTEL_LIGHT_PEAK:
1453 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_2C:
1454 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C:
1455 case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
1456 case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_2C_BRIDGE:
1457 case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_4C_BRIDGE:
1460 case PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_BRIDGE:
1461 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE:
1462 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE:
1465 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE:
1466 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_BRIDGE:
1467 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_BRIDGE:
1468 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE:
1469 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE:
1470 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_BRIDGE:
1471 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_BRIDGE:
1472 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_BRIDGE:
1473 case PCI_DEVICE_ID_INTEL_ICL_NHI0:
1474 case PCI_DEVICE_ID_INTEL_ICL_NHI1:
1479 * For unknown switches assume generation to be 1 to be
1482 tb_sw_warn(sw, "unsupported switch device id %#x\n",
1483 sw->config.device_id);
1489 * tb_switch_alloc() - allocate a switch
1490 * @tb: Pointer to the owning domain
1491 * @parent: Parent device for this switch
1492 * @route: Route string for this switch
1494 * Allocates and initializes a switch. Will not upload configuration to
1495 * the switch. For that you need to call tb_switch_configure()
1496 * separately. The returned switch should be released by calling
1499 * Return: Pointer to the allocated switch or ERR_PTR() in case of
1502 struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,
1505 struct tb_switch *sw;
1509 /* Make sure we do not exceed maximum topology limit */
1510 depth = tb_route_length(route);
1511 if (depth > TB_SWITCH_MAX_DEPTH)
1512 return ERR_PTR(-EADDRNOTAVAIL);
1514 upstream_port = tb_cfg_get_upstream_port(tb->ctl, route);
1515 if (upstream_port < 0)
1516 return ERR_PTR(upstream_port);
1518 sw = kzalloc(sizeof(*sw), GFP_KERNEL);
1520 return ERR_PTR(-ENOMEM);
1523 ret = tb_cfg_read(tb->ctl, &sw->config, route, 0, TB_CFG_SWITCH, 0, 5);
1525 goto err_free_sw_ports;
1527 tb_dbg(tb, "current switch config:\n");
1528 tb_dump_switch(tb, &sw->config);
1530 /* configure switch */
1531 sw->config.upstream_port_number = upstream_port;
1532 sw->config.depth = depth;
1533 sw->config.route_hi = upper_32_bits(route);
1534 sw->config.route_lo = lower_32_bits(route);
1535 sw->config.enabled = 0;
1537 /* initialize ports */
1538 sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports),
1542 goto err_free_sw_ports;
1545 for (i = 0; i <= sw->config.max_port_number; i++) {
1546 /* minimum setup for tb_find_cap and tb_drom_read to work */
1547 sw->ports[i].sw = sw;
1548 sw->ports[i].port = i;
1551 sw->generation = tb_switch_get_generation(sw);
1553 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_PLUG_EVENTS);
1555 tb_sw_warn(sw, "cannot find TB_VSE_CAP_PLUG_EVENTS aborting\n");
1556 goto err_free_sw_ports;
1558 sw->cap_plug_events = ret;
1560 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_LINK_CONTROLLER);
1564 /* Root switch is always authorized */
1566 sw->authorized = true;
1568 device_initialize(&sw->dev);
1569 sw->dev.parent = parent;
1570 sw->dev.bus = &tb_bus_type;
1571 sw->dev.type = &tb_switch_type;
1572 sw->dev.groups = switch_groups;
1573 dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
1581 return ERR_PTR(ret);
1585 * tb_switch_alloc_safe_mode() - allocate a switch that is in safe mode
1586 * @tb: Pointer to the owning domain
1587 * @parent: Parent device for this switch
1588 * @route: Route string for this switch
1590 * This creates a switch in safe mode. This means the switch pretty much
1591 * lacks all capabilities except DMA configuration port before it is
1592 * flashed with a valid NVM firmware.
1594 * The returned switch must be released by calling tb_switch_put().
1596 * Return: Pointer to the allocated switch or ERR_PTR() in case of failure
1599 tb_switch_alloc_safe_mode(struct tb *tb, struct device *parent, u64 route)
1601 struct tb_switch *sw;
1603 sw = kzalloc(sizeof(*sw), GFP_KERNEL);
1605 return ERR_PTR(-ENOMEM);
1608 sw->config.depth = tb_route_length(route);
1609 sw->config.route_hi = upper_32_bits(route);
1610 sw->config.route_lo = lower_32_bits(route);
1611 sw->safe_mode = true;
1613 device_initialize(&sw->dev);
1614 sw->dev.parent = parent;
1615 sw->dev.bus = &tb_bus_type;
1616 sw->dev.type = &tb_switch_type;
1617 sw->dev.groups = switch_groups;
1618 dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
1624 * tb_switch_configure() - Uploads configuration to the switch
1625 * @sw: Switch to configure
1627 * Call this function before the switch is added to the system. It will
1628 * upload configuration to the switch and makes it available for the
1629 * connection manager to use.
1631 * Return: %0 in case of success and negative errno in case of failure
1633 int tb_switch_configure(struct tb_switch *sw)
1635 struct tb *tb = sw->tb;
1639 route = tb_route(sw);
1640 tb_dbg(tb, "initializing Switch at %#llx (depth: %d, up port: %d)\n",
1641 route, tb_route_length(route), sw->config.upstream_port_number);
1643 if (sw->config.vendor_id != PCI_VENDOR_ID_INTEL)
1644 tb_sw_warn(sw, "unknown switch vendor id %#x\n",
1645 sw->config.vendor_id);
1647 sw->config.enabled = 1;
1649 /* upload configuration */
1650 ret = tb_sw_write(sw, 1 + (u32 *)&sw->config, TB_CFG_SWITCH, 1, 3);
1654 ret = tb_lc_configure_link(sw);
1658 return tb_plug_events_active(sw, true);
1661 static int tb_switch_set_uuid(struct tb_switch *sw)
1670 * The newer controllers include fused UUID as part of link
1671 * controller specific registers
1673 ret = tb_lc_read_uuid(sw, uuid);
1676 * ICM generates UUID based on UID and fills the upper
1677 * two words with ones. This is not strictly following
1678 * UUID format but we want to be compatible with it so
1679 * we do the same here.
1681 uuid[0] = sw->uid & 0xffffffff;
1682 uuid[1] = (sw->uid >> 32) & 0xffffffff;
1683 uuid[2] = 0xffffffff;
1684 uuid[3] = 0xffffffff;
1687 sw->uuid = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
1693 static int tb_switch_add_dma_port(struct tb_switch *sw)
1698 switch (sw->generation) {
1703 /* Only root switch can be upgraded */
1710 * DMA port is the only thing available when the switch
1718 /* Root switch DMA port requires running firmware */
1719 if (!tb_route(sw) && sw->config.enabled)
1722 sw->dma_port = dma_port_alloc(sw);
1726 if (sw->no_nvm_upgrade)
1730 * Check status of the previous flash authentication. If there
1731 * is one we need to power cycle the switch in any case to make
1732 * it functional again.
1734 ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
1738 /* Now we can allow root port to suspend again */
1740 nvm_authenticate_complete(sw);
1743 tb_sw_info(sw, "switch flash authentication failed\n");
1744 ret = tb_switch_set_uuid(sw);
1747 nvm_set_auth_status(sw, status);
1750 tb_sw_info(sw, "power cycling the switch now\n");
1751 dma_port_power_cycle(sw->dma_port);
1754 * We return error here which causes the switch adding failure.
1755 * It should appear back after power cycle is complete.
1761 * tb_switch_add() - Add a switch to the domain
1762 * @sw: Switch to add
1764 * This is the last step in adding switch to the domain. It will read
1765 * identification information from DROM and initializes ports so that
1766 * they can be used to connect other switches. The switch will be
1767 * exposed to the userspace when this function successfully returns. To
1768 * remove and release the switch, call tb_switch_remove().
1770 * Return: %0 in case of success and negative errno in case of failure
1772 int tb_switch_add(struct tb_switch *sw)
1777 * Initialize DMA control port now before we read DROM. Recent
1778 * host controllers have more complete DROM on NVM that includes
1779 * vendor and model identification strings which we then expose
1780 * to the userspace. NVM can be accessed through DMA
1781 * configuration based mailbox.
1783 ret = tb_switch_add_dma_port(sw);
1787 if (!sw->safe_mode) {
1789 ret = tb_drom_read(sw);
1791 tb_sw_warn(sw, "tb_eeprom_read_rom failed\n");
1794 tb_sw_dbg(sw, "uid: %#llx\n", sw->uid);
1796 ret = tb_switch_set_uuid(sw);
1800 for (i = 0; i <= sw->config.max_port_number; i++) {
1801 if (sw->ports[i].disabled) {
1802 tb_port_dbg(&sw->ports[i], "disabled by eeprom\n");
1805 ret = tb_init_port(&sw->ports[i]);
1811 ret = device_add(&sw->dev);
1816 dev_info(&sw->dev, "new device found, vendor=%#x device=%#x\n",
1817 sw->vendor, sw->device);
1818 if (sw->vendor_name && sw->device_name)
1819 dev_info(&sw->dev, "%s %s\n", sw->vendor_name,
1823 ret = tb_switch_nvm_add(sw);
1825 device_del(&sw->dev);
1829 pm_runtime_set_active(&sw->dev);
1831 pm_runtime_set_autosuspend_delay(&sw->dev, TB_AUTOSUSPEND_DELAY);
1832 pm_runtime_use_autosuspend(&sw->dev);
1833 pm_runtime_mark_last_busy(&sw->dev);
1834 pm_runtime_enable(&sw->dev);
1835 pm_request_autosuspend(&sw->dev);
1842 * tb_switch_remove() - Remove and release a switch
1843 * @sw: Switch to remove
1845 * This will remove the switch from the domain and release it after last
1846 * reference count drops to zero. If there are switches connected below
1847 * this switch, they will be removed as well.
1849 void tb_switch_remove(struct tb_switch *sw)
1854 pm_runtime_get_sync(&sw->dev);
1855 pm_runtime_disable(&sw->dev);
1858 /* port 0 is the switch itself and never has a remote */
1859 for (i = 1; i <= sw->config.max_port_number; i++) {
1860 if (tb_port_has_remote(&sw->ports[i])) {
1861 tb_switch_remove(sw->ports[i].remote->sw);
1862 sw->ports[i].remote = NULL;
1863 } else if (sw->ports[i].xdomain) {
1864 tb_xdomain_remove(sw->ports[i].xdomain);
1865 sw->ports[i].xdomain = NULL;
1869 if (!sw->is_unplugged)
1870 tb_plug_events_active(sw, false);
1871 tb_lc_unconfigure_link(sw);
1873 tb_switch_nvm_remove(sw);
1876 dev_info(&sw->dev, "device disconnected\n");
1877 device_unregister(&sw->dev);
1881 * tb_sw_set_unplugged() - set is_unplugged on switch and downstream switches
1883 void tb_sw_set_unplugged(struct tb_switch *sw)
1886 if (sw == sw->tb->root_switch) {
1887 tb_sw_WARN(sw, "cannot unplug root switch\n");
1890 if (sw->is_unplugged) {
1891 tb_sw_WARN(sw, "is_unplugged already set\n");
1894 sw->is_unplugged = true;
1895 for (i = 0; i <= sw->config.max_port_number; i++) {
1896 if (tb_port_has_remote(&sw->ports[i]))
1897 tb_sw_set_unplugged(sw->ports[i].remote->sw);
1898 else if (sw->ports[i].xdomain)
1899 sw->ports[i].xdomain->is_unplugged = true;
1903 int tb_switch_resume(struct tb_switch *sw)
1906 tb_sw_dbg(sw, "resuming switch\n");
1909 * Check for UID of the connected switches except for root
1910 * switch which we assume cannot be removed.
1916 * Check first that we can still read the switch config
1917 * space. It may be that there is now another domain
1920 err = tb_cfg_get_upstream_port(sw->tb->ctl, tb_route(sw));
1922 tb_sw_info(sw, "switch not present anymore\n");
1926 err = tb_drom_read_uid_only(sw, &uid);
1928 tb_sw_warn(sw, "uid read failed\n");
1931 if (sw->uid != uid) {
1933 "changed while suspended (uid %#llx -> %#llx)\n",
1939 /* upload configuration */
1940 err = tb_sw_write(sw, 1 + (u32 *) &sw->config, TB_CFG_SWITCH, 1, 3);
1944 err = tb_lc_configure_link(sw);
1948 err = tb_plug_events_active(sw, true);
1952 /* check for surviving downstream switches */
1953 for (i = 1; i <= sw->config.max_port_number; i++) {
1954 struct tb_port *port = &sw->ports[i];
1956 if (!tb_port_has_remote(port) && !port->xdomain)
1959 if (tb_wait_for_port(port, true) <= 0) {
1961 "lost during suspend, disconnecting\n");
1962 if (tb_port_has_remote(port))
1963 tb_sw_set_unplugged(port->remote->sw);
1964 else if (port->xdomain)
1965 port->xdomain->is_unplugged = true;
1966 } else if (tb_port_has_remote(port)) {
1967 if (tb_switch_resume(port->remote->sw)) {
1969 "lost during suspend, disconnecting\n");
1970 tb_sw_set_unplugged(port->remote->sw);
1977 void tb_switch_suspend(struct tb_switch *sw)
1980 err = tb_plug_events_active(sw, false);
1984 for (i = 1; i <= sw->config.max_port_number; i++) {
1985 if (tb_port_has_remote(&sw->ports[i]))
1986 tb_switch_suspend(sw->ports[i].remote->sw);
1989 tb_lc_set_sleep(sw);
1992 struct tb_sw_lookup {
2000 static int tb_switch_match(struct device *dev, const void *data)
2002 struct tb_switch *sw = tb_to_switch(dev);
2003 const struct tb_sw_lookup *lookup = data;
2007 if (sw->tb != lookup->tb)
2011 return !memcmp(sw->uuid, lookup->uuid, sizeof(*lookup->uuid));
2013 if (lookup->route) {
2014 return sw->config.route_lo == lower_32_bits(lookup->route) &&
2015 sw->config.route_hi == upper_32_bits(lookup->route);
2018 /* Root switch is matched only by depth */
2022 return sw->link == lookup->link && sw->depth == lookup->depth;
2026 * tb_switch_find_by_link_depth() - Find switch by link and depth
2027 * @tb: Domain the switch belongs
2028 * @link: Link number the switch is connected
2029 * @depth: Depth of the switch in link
2031 * Returned switch has reference count increased so the caller needs to
2032 * call tb_switch_put() when done with the switch.
2034 struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link, u8 depth)
2036 struct tb_sw_lookup lookup;
2039 memset(&lookup, 0, sizeof(lookup));
2042 lookup.depth = depth;
2044 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
2046 return tb_to_switch(dev);
2052 * tb_switch_find_by_uuid() - Find switch by UUID
2053 * @tb: Domain the switch belongs
2054 * @uuid: UUID to look for
2056 * Returned switch has reference count increased so the caller needs to
2057 * call tb_switch_put() when done with the switch.
2059 struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_t *uuid)
2061 struct tb_sw_lookup lookup;
2064 memset(&lookup, 0, sizeof(lookup));
2068 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
2070 return tb_to_switch(dev);
2076 * tb_switch_find_by_route() - Find switch by route string
2077 * @tb: Domain the switch belongs
2078 * @route: Route string to look for
2080 * Returned switch has reference count increased so the caller needs to
2081 * call tb_switch_put() when done with the switch.
2083 struct tb_switch *tb_switch_find_by_route(struct tb *tb, u64 route)
2085 struct tb_sw_lookup lookup;
2089 return tb_switch_get(tb->root_switch);
2091 memset(&lookup, 0, sizeof(lookup));
2093 lookup.route = route;
2095 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
2097 return tb_to_switch(dev);
2102 void tb_switch_exit(void)
2104 ida_destroy(&nvm_ida);