| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Thunderbolt driver - switch/port utility functions |
| * |
| * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> |
| * Copyright (C) 2018, Intel Corporation |
| */ |
| |
| #include <linux/delay.h> |
| #include <linux/idr.h> |
| #include <linux/module.h> |
| #include <linux/nvmem-provider.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/sched/signal.h> |
| #include <linux/sizes.h> |
| #include <linux/slab.h> |
| #include <linux/string_helpers.h> |
| |
| #include "tb.h" |
| |
| /* Switch NVM support */ |
| |
| struct nvm_auth_status { |
| struct list_head list; |
| uuid_t uuid; |
| u32 status; |
| }; |
| |
| /* |
| * Hold NVM authentication failure status per switch This information |
| * needs to stay around even when the switch gets power cycled so we |
| * keep it separately. |
| */ |
| static LIST_HEAD(nvm_auth_status_cache); |
| static DEFINE_MUTEX(nvm_auth_status_lock); |
| |
| static struct nvm_auth_status *__nvm_get_auth_status(const struct tb_switch *sw) |
| { |
| struct nvm_auth_status *st; |
| |
| list_for_each_entry(st, &nvm_auth_status_cache, list) { |
| if (uuid_equal(&st->uuid, sw->uuid)) |
| return st; |
| } |
| |
| return NULL; |
| } |
| |
| static void nvm_get_auth_status(const struct tb_switch *sw, u32 *status) |
| { |
| struct nvm_auth_status *st; |
| |
| mutex_lock(&nvm_auth_status_lock); |
| st = __nvm_get_auth_status(sw); |
| mutex_unlock(&nvm_auth_status_lock); |
| |
| *status = st ? st->status : 0; |
| } |
| |
| static void nvm_set_auth_status(const struct tb_switch *sw, u32 status) |
| { |
| struct nvm_auth_status *st; |
| |
| if (WARN_ON(!sw->uuid)) |
| return; |
| |
| mutex_lock(&nvm_auth_status_lock); |
| st = __nvm_get_auth_status(sw); |
| |
| if (!st) { |
| st = kzalloc(sizeof(*st), GFP_KERNEL); |
| if (!st) |
| goto unlock; |
| |
| memcpy(&st->uuid, sw->uuid, sizeof(st->uuid)); |
| INIT_LIST_HEAD(&st->list); |
| list_add_tail(&st->list, &nvm_auth_status_cache); |
| } |
| |
| st->status = status; |
| unlock: |
| mutex_unlock(&nvm_auth_status_lock); |
| } |
| |
| static void nvm_clear_auth_status(const struct tb_switch *sw) |
| { |
| struct nvm_auth_status *st; |
| |
| mutex_lock(&nvm_auth_status_lock); |
| st = __nvm_get_auth_status(sw); |
| if (st) { |
| list_del(&st->list); |
| kfree(st); |
| } |
| mutex_unlock(&nvm_auth_status_lock); |
| } |
| |
| static int nvm_validate_and_write(struct tb_switch *sw) |
| { |
| unsigned int image_size; |
| const u8 *buf; |
| int ret; |
| |
| ret = tb_nvm_validate(sw->nvm); |
| if (ret) |
| return ret; |
| |
| ret = tb_nvm_write_headers(sw->nvm); |
| if (ret) |
| return ret; |
| |
| buf = sw->nvm->buf_data_start; |
| image_size = sw->nvm->buf_data_size; |
| |
| if (tb_switch_is_usb4(sw)) |
| ret = usb4_switch_nvm_write(sw, 0, buf, image_size); |
| else |
| ret = dma_port_flash_write(sw->dma_port, 0, buf, image_size); |
| if (ret) |
| return ret; |
| |
| sw->nvm->flushed = true; |
| return 0; |
| } |
| |
| static int nvm_authenticate_host_dma_port(struct tb_switch *sw) |
| { |
| int ret = 0; |
| |
| /* |
| * Root switch NVM upgrade requires that we disconnect the |
| * existing paths first (in case it is not in safe mode |
| * already). |
| */ |
| if (!sw->safe_mode) { |
| u32 status; |
| |
| ret = tb_domain_disconnect_all_paths(sw->tb); |
| if (ret) |
| return ret; |
| /* |
| * The host controller goes away pretty soon after this if |
| * everything goes well so getting timeout is expected. |
| */ |
| ret = dma_port_flash_update_auth(sw->dma_port); |
| if (!ret || ret == -ETIMEDOUT) |
| return 0; |
| |
| /* |
| * Any error from update auth operation requires power |
| * cycling of the host router. |
| */ |
| tb_sw_warn(sw, "failed to authenticate NVM, power cycling\n"); |
| if (dma_port_flash_update_auth_status(sw->dma_port, &status) > 0) |
| nvm_set_auth_status(sw, status); |
| } |
| |
| /* |
| * From safe mode we can get out by just power cycling the |
| * switch. |
| */ |
| dma_port_power_cycle(sw->dma_port); |
| return ret; |
| } |
| |
| static int nvm_authenticate_device_dma_port(struct tb_switch *sw) |
| { |
| int ret, retries = 10; |
| |
| ret = dma_port_flash_update_auth(sw->dma_port); |
| switch (ret) { |
| case 0: |
| case -ETIMEDOUT: |
| case -EACCES: |
| case -EINVAL: |
| /* Power cycle is required */ |
| break; |
| default: |
| return ret; |
| } |
| |
| /* |
| * Poll here for the authentication status. It takes some time |
| * for the device to respond (we get timeout for a while). Once |
| * we get response the device needs to be power cycled in order |
| * to the new NVM to be taken into use. |
| */ |
| do { |
| u32 status; |
| |
| ret = dma_port_flash_update_auth_status(sw->dma_port, &status); |
| if (ret < 0 && ret != -ETIMEDOUT) |
| return ret; |
| if (ret > 0) { |
| if (status) { |
| tb_sw_warn(sw, "failed to authenticate NVM\n"); |
| nvm_set_auth_status(sw, status); |
| } |
| |
| tb_sw_info(sw, "power cycling the switch now\n"); |
| dma_port_power_cycle(sw->dma_port); |
| return 0; |
| } |
| |
| msleep(500); |
| } while (--retries); |
| |
| return -ETIMEDOUT; |
| } |
| |
| static void nvm_authenticate_start_dma_port(struct tb_switch *sw) |
| { |
| struct pci_dev *root_port; |
| |
| /* |
| * During host router NVM upgrade we should not allow root port to |
| * go into D3cold because some root ports cannot trigger PME |
| * itself. To be on the safe side keep the root port in D0 during |
| * the whole upgrade process. |
| */ |
| root_port = pcie_find_root_port(sw->tb->nhi->pdev); |
| if (root_port) |
| pm_runtime_get_noresume(&root_port->dev); |
| } |
| |
| static void nvm_authenticate_complete_dma_port(struct tb_switch *sw) |
| { |
| struct pci_dev *root_port; |
| |
| root_port = pcie_find_root_port(sw->tb->nhi->pdev); |
| if (root_port) |
| pm_runtime_put(&root_port->dev); |
| } |
| |
| static inline bool nvm_readable(struct tb_switch *sw) |
| { |
| if (tb_switch_is_usb4(sw)) { |
| /* |
| * USB4 devices must support NVM operations but it is |
| * optional for hosts. Therefore we query the NVM sector |
| * size here and if it is supported assume NVM |
| * operations are implemented. |
| */ |
| return usb4_switch_nvm_sector_size(sw) > 0; |
| } |
| |
| /* Thunderbolt 2 and 3 devices support NVM through DMA port */ |
| return !!sw->dma_port; |
| } |
| |
| static inline bool nvm_upgradeable(struct tb_switch *sw) |
| { |
| if (sw->no_nvm_upgrade) |
| return false; |
| return nvm_readable(sw); |
| } |
| |
| static int nvm_authenticate(struct tb_switch *sw, bool auth_only) |
| { |
| int ret; |
| |
| if (tb_switch_is_usb4(sw)) { |
| if (auth_only) { |
| ret = usb4_switch_nvm_set_offset(sw, 0); |
| if (ret) |
| return ret; |
| } |
| sw->nvm->authenticating = true; |
| return usb4_switch_nvm_authenticate(sw); |
| } |
| if (auth_only) |
| return -EOPNOTSUPP; |
| |
| sw->nvm->authenticating = true; |
| if (!tb_route(sw)) { |
| nvm_authenticate_start_dma_port(sw); |
| ret = nvm_authenticate_host_dma_port(sw); |
| } else { |
| ret = nvm_authenticate_device_dma_port(sw); |
| } |
| |
| return ret; |
| } |
| |
| /** |
| * tb_switch_nvm_read() - Read router NVM |
| * @sw: Router whose NVM to read |
| * @address: Start address on the NVM |
| * @buf: Buffer where the read data is copied |
| * @size: Size of the buffer in bytes |
| * |
| * Reads from router NVM and returns the requested data in @buf. Locking |
| * is up to the caller. Returns %0 in success and negative errno in case |
| * of failure. |
| */ |
| int tb_switch_nvm_read(struct tb_switch *sw, unsigned int address, void *buf, |
| size_t size) |
| { |
| if (tb_switch_is_usb4(sw)) |
| return usb4_switch_nvm_read(sw, address, buf, size); |
| return dma_port_flash_read(sw->dma_port, address, buf, size); |
| } |
| |
| static int nvm_read(void *priv, unsigned int offset, void *val, size_t bytes) |
| { |
| struct tb_nvm *nvm = priv; |
| struct tb_switch *sw = tb_to_switch(nvm->dev); |
| int ret; |
| |
| pm_runtime_get_sync(&sw->dev); |
| |
| if (!mutex_trylock(&sw->tb->lock)) { |
| ret = restart_syscall(); |
| goto out; |
| } |
| |
| ret = tb_switch_nvm_read(sw, offset, val, bytes); |
| mutex_unlock(&sw->tb->lock); |
| |
| out: |
| pm_runtime_mark_last_busy(&sw->dev); |
| pm_runtime_put_autosuspend(&sw->dev); |
| |
| return ret; |
| } |
| |
| static int nvm_write(void *priv, unsigned int offset, void *val, size_t bytes) |
| { |
| struct tb_nvm *nvm = priv; |
| struct tb_switch *sw = tb_to_switch(nvm->dev); |
| int ret; |
| |
| if (!mutex_trylock(&sw->tb->lock)) |
| return restart_syscall(); |
| |
| /* |
| * Since writing the NVM image might require some special steps, |
| * for example when CSS headers are written, we cache the image |
| * locally here and handle the special cases when the user asks |
| * us to authenticate the image. |
| */ |
| ret = tb_nvm_write_buf(nvm, offset, val, bytes); |
| mutex_unlock(&sw->tb->lock); |
| |
| return ret; |
| } |
| |
| static int tb_switch_nvm_add(struct tb_switch *sw) |
| { |
| struct tb_nvm *nvm; |
| int ret; |
| |
| if (!nvm_readable(sw)) |
| return 0; |
| |
| nvm = tb_nvm_alloc(&sw->dev); |
| if (IS_ERR(nvm)) { |
| ret = PTR_ERR(nvm) == -EOPNOTSUPP ? 0 : PTR_ERR(nvm); |
| goto err_nvm; |
| } |
| |
| ret = tb_nvm_read_version(nvm); |
| if (ret) |
| goto err_nvm; |
| |
| /* |
| * If the switch is in safe-mode the only accessible portion of |
| * the NVM is the non-active one where userspace is expected to |
| * write new functional NVM. |
| */ |
| if (!sw->safe_mode) { |
| ret = tb_nvm_add_active(nvm, nvm_read); |
| if (ret) |
| goto err_nvm; |
| tb_sw_dbg(sw, "NVM version %x.%x\n", nvm->major, nvm->minor); |
| } |
| |
| if (!sw->no_nvm_upgrade) { |
| ret = tb_nvm_add_non_active(nvm, nvm_write); |
| if (ret) |
| goto err_nvm; |
| } |
| |
| sw->nvm = nvm; |
| return 0; |
| |
| err_nvm: |
| tb_sw_dbg(sw, "NVM upgrade disabled\n"); |
| sw->no_nvm_upgrade = true; |
| if (!IS_ERR(nvm)) |
| tb_nvm_free(nvm); |
| |
| return ret; |
| } |
| |
| static void tb_switch_nvm_remove(struct tb_switch *sw) |
| { |
| struct tb_nvm *nvm; |
| |
| nvm = sw->nvm; |
| sw->nvm = NULL; |
| |
| if (!nvm) |
| return; |
| |
| /* Remove authentication status in case the switch is unplugged */ |
| if (!nvm->authenticating) |
| nvm_clear_auth_status(sw); |
| |
| tb_nvm_free(nvm); |
| } |
| |
| /* port utility functions */ |
| |
| static const char *tb_port_type(const struct tb_regs_port_header *port) |
| { |
| switch (port->type >> 16) { |
| case 0: |
| switch ((u8) port->type) { |
| case 0: |
| return "Inactive"; |
| case 1: |
| return "Port"; |
| case 2: |
| return "NHI"; |
| default: |
| return "unknown"; |
| } |
| case 0x2: |
| return "Ethernet"; |
| case 0x8: |
| return "SATA"; |
| case 0xe: |
| return "DP/HDMI"; |
| case 0x10: |
| return "PCIe"; |
| case 0x20: |
| return "USB"; |
| default: |
| return "unknown"; |
| } |
| } |
| |
| static void tb_dump_port(struct tb *tb, const struct tb_port *port) |
| { |
| const struct tb_regs_port_header *regs = &port->config; |
| |
| tb_dbg(tb, |
| " Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n", |
| regs->port_number, regs->vendor_id, regs->device_id, |
| regs->revision, regs->thunderbolt_version, tb_port_type(regs), |
| regs->type); |
| tb_dbg(tb, " Max hop id (in/out): %d/%d\n", |
| regs->max_in_hop_id, regs->max_out_hop_id); |
| tb_dbg(tb, " Max counters: %d\n", regs->max_counters); |
| tb_dbg(tb, " NFC Credits: %#x\n", regs->nfc_credits); |
| tb_dbg(tb, " Credits (total/control): %u/%u\n", port->total_credits, |
| port->ctl_credits); |
| } |
| |
| /** |
| * tb_port_state() - get connectedness state of a port |
| * @port: the port to check |
| * |
| * The port must have a TB_CAP_PHY (i.e. it should be a real port). |
| * |
| * Return: Returns an enum tb_port_state on success or an error code on failure. |
| */ |
| int tb_port_state(struct tb_port *port) |
| { |
| struct tb_cap_phy phy; |
| int res; |
| if (port->cap_phy == 0) { |
| tb_port_WARN(port, "does not have a PHY\n"); |
| return -EINVAL; |
| } |
| res = tb_port_read(port, &phy, TB_CFG_PORT, port->cap_phy, 2); |
| if (res) |
| return res; |
| return phy.state; |
| } |
| |
| /** |
| * tb_wait_for_port() - wait for a port to become ready |
| * @port: Port to wait |
| * @wait_if_unplugged: Wait also when port is unplugged |
| * |
| * Wait up to 1 second for a port to reach state TB_PORT_UP. If |
| * wait_if_unplugged is set then we also wait if the port is in state |
| * TB_PORT_UNPLUGGED (it takes a while for the device to be registered after |
| * switch resume). Otherwise we only wait if a device is registered but the link |
| * has not yet been established. |
| * |
| * Return: Returns an error code on failure. Returns 0 if the port is not |
| * connected or failed to reach state TB_PORT_UP within one second. Returns 1 |
| * if the port is connected and in state TB_PORT_UP. |
| */ |
| int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged) |
| { |
| int retries = 10; |
| int state; |
| if (!port->cap_phy) { |
| tb_port_WARN(port, "does not have PHY\n"); |
| return -EINVAL; |
| } |
| if (tb_is_upstream_port(port)) { |
| tb_port_WARN(port, "is the upstream port\n"); |
| return -EINVAL; |
| } |
| |
| while (retries--) { |
| state = tb_port_state(port); |
| switch (state) { |
| case TB_PORT_DISABLED: |
| tb_port_dbg(port, "is disabled (state: 0)\n"); |
| return 0; |
| |
| case TB_PORT_UNPLUGGED: |
| if (wait_if_unplugged) { |
| /* used during resume */ |
| tb_port_dbg(port, |
| "is unplugged (state: 7), retrying...\n"); |
| msleep(100); |
| break; |
| } |
| tb_port_dbg(port, "is unplugged (state: 7)\n"); |
| return 0; |
| |
| case TB_PORT_UP: |
| case TB_PORT_TX_CL0S: |
| case TB_PORT_RX_CL0S: |
| case TB_PORT_CL1: |
| case TB_PORT_CL2: |
| tb_port_dbg(port, "is connected, link is up (state: %d)\n", state); |
| return 1; |
| |
| default: |
| if (state < 0) |
| return state; |
| |
| /* |
| * After plug-in the state is TB_PORT_CONNECTING. Give it some |
| * time. |
| */ |
| tb_port_dbg(port, |
| "is connected, link is not up (state: %d), retrying...\n", |
| state); |
| msleep(100); |
| } |
| |
| } |
| tb_port_warn(port, |
| "failed to reach state TB_PORT_UP. Ignoring port...\n"); |
| return 0; |
| } |
| |
| /** |
| * tb_port_add_nfc_credits() - add/remove non flow controlled credits to port |
| * @port: Port to add/remove NFC credits |
| * @credits: Credits to add/remove |
| * |
| * Change the number of NFC credits allocated to @port by @credits. To remove |
| * NFC credits pass a negative amount of credits. |
| * |
| * Return: Returns 0 on success or an error code on failure. |
| */ |
| int tb_port_add_nfc_credits(struct tb_port *port, int credits) |
| { |
| u32 nfc_credits; |
| |
| if (credits == 0 || port->sw->is_unplugged) |
| return 0; |
| |
| /* |
| * USB4 restricts programming NFC buffers to lane adapters only |
| * so skip other ports. |
| */ |
| if (tb_switch_is_usb4(port->sw) && !tb_port_is_null(port)) |
| return 0; |
| |
| nfc_credits = port->config.nfc_credits & ADP_CS_4_NFC_BUFFERS_MASK; |
| if (credits < 0) |
| credits = max_t(int, -nfc_credits, credits); |
| |
| nfc_credits += credits; |
| |
| tb_port_dbg(port, "adding %d NFC credits to %lu", credits, |
| port->config.nfc_credits & ADP_CS_4_NFC_BUFFERS_MASK); |
| |
| port->config.nfc_credits &= ~ADP_CS_4_NFC_BUFFERS_MASK; |
| port->config.nfc_credits |= nfc_credits; |
| |
| return tb_port_write(port, &port->config.nfc_credits, |
| TB_CFG_PORT, ADP_CS_4, 1); |
| } |
| |
| /** |
| * tb_port_clear_counter() - clear a counter in TB_CFG_COUNTER |
| * @port: Port whose counters to clear |
| * @counter: Counter index to clear |
| * |
| * Return: Returns 0 on success or an error code on failure. |
| */ |
| int tb_port_clear_counter(struct tb_port *port, int counter) |
| { |
| u32 zero[3] = { 0, 0, 0 }; |
| tb_port_dbg(port, "clearing counter %d\n", counter); |
| return tb_port_write(port, zero, TB_CFG_COUNTERS, 3 * counter, 3); |
| } |
| |
| /** |
| * tb_port_unlock() - Unlock downstream port |
| * @port: Port to unlock |
| * |
| * Needed for USB4 but can be called for any CIO/USB4 ports. Makes the |
| * downstream router accessible for CM. |
| */ |
| int tb_port_unlock(struct tb_port *port) |
| { |
| if (tb_switch_is_icm(port->sw)) |
| return 0; |
| if (!tb_port_is_null(port)) |
| return -EINVAL; |
| if (tb_switch_is_usb4(port->sw)) |
| return usb4_port_unlock(port); |
| return 0; |
| } |
| |
| static int __tb_port_enable(struct tb_port *port, bool enable) |
| { |
| int ret; |
| u32 phy; |
| |
| if (!tb_port_is_null(port)) |
| return -EINVAL; |
| |
| ret = tb_port_read(port, &phy, TB_CFG_PORT, |
| port->cap_phy + LANE_ADP_CS_1, 1); |
| if (ret) |
| return ret; |
| |
| if (enable) |
| phy &= ~LANE_ADP_CS_1_LD; |
| else |
| phy |= LANE_ADP_CS_1_LD; |
| |
| |
| ret = tb_port_write(port, &phy, TB_CFG_PORT, |
| port->cap_phy + LANE_ADP_CS_1, 1); |
| if (ret) |
| return ret; |
| |
| tb_port_dbg(port, "lane %s\n", str_enabled_disabled(enable)); |
| return 0; |
| } |
| |
| /** |
| * tb_port_enable() - Enable lane adapter |
| * @port: Port to enable (can be %NULL) |
| * |
| * This is used for lane 0 and 1 adapters to enable it. |
| */ |
| int tb_port_enable(struct tb_port *port) |
| { |
| return __tb_port_enable(port, true); |
| } |
| |
| /** |
| * tb_port_disable() - Disable lane adapter |
| * @port: Port to disable (can be %NULL) |
| * |
| * This is used for lane 0 and 1 adapters to disable it. |
| */ |
| int tb_port_disable(struct tb_port *port) |
| { |
| return __tb_port_enable(port, false); |
| } |
| |
| static int tb_port_reset(struct tb_port *port) |
| { |
| if (tb_switch_is_usb4(port->sw)) |
| return port->cap_usb4 ? usb4_port_reset(port) : 0; |
| return tb_lc_reset_port(port); |
| } |
| |
| /* |
| * tb_init_port() - initialize a port |
| * |
| * This is a helper method for tb_switch_alloc. Does not check or initialize |
| * any downstream switches. |
| * |
| * Return: Returns 0 on success or an error code on failure. |
| */ |
| static int tb_init_port(struct tb_port *port) |
| { |
| int res; |
| int cap; |
| |
| INIT_LIST_HEAD(&port->list); |
| |
| /* Control adapter does not have configuration space */ |
| if (!port->port) |
| return 0; |
| |
| res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8); |
| if (res) { |
| if (res == -ENODEV) { |
| tb_dbg(port->sw->tb, " Port %d: not implemented\n", |
| port->port); |
| port->disabled = true; |
| return 0; |
| } |
| return res; |
| } |
| |
| /* Port 0 is the switch itself and has no PHY. */ |
| if (port->config.type == TB_TYPE_PORT) { |
| cap = tb_port_find_cap(port, TB_PORT_CAP_PHY); |
| |
| if (cap > 0) |
| port->cap_phy = cap; |
| else |
| tb_port_WARN(port, "non switch port without a PHY\n"); |
| |
| cap = tb_port_find_cap(port, TB_PORT_CAP_USB4); |
| if (cap > 0) |
| port->cap_usb4 = cap; |
| |
| /* |
| * USB4 ports the buffers allocated for the control path |
| * can be read from the path config space. Legacy |
| * devices we use hard-coded value. |
| */ |
| if (port->cap_usb4) { |
| struct tb_regs_hop hop; |
| |
| if (!tb_port_read(port, &hop, TB_CFG_HOPS, 0, 2)) |
| port->ctl_credits = hop.initial_credits; |
| } |
| if (!port->ctl_credits) |
| port->ctl_credits = 2; |
| |
| } else { |
| cap = tb_port_find_cap(port, TB_PORT_CAP_ADAP); |
| if (cap > 0) |
| port->cap_adap = cap; |
| } |
| |
| port->total_credits = |
| (port->config.nfc_credits & ADP_CS_4_TOTAL_BUFFERS_MASK) >> |
| ADP_CS_4_TOTAL_BUFFERS_SHIFT; |
| |
| tb_dump_port(port->sw->tb, port); |
| return 0; |
| } |
| |
| static int tb_port_alloc_hopid(struct tb_port *port, bool in, int min_hopid, |
| int max_hopid) |
| { |
| int port_max_hopid; |
| struct ida *ida; |
| |
| if (in) { |
| port_max_hopid = port->config.max_in_hop_id; |
| ida = &port->in_hopids; |
| } else { |
| port_max_hopid = port->config.max_out_hop_id; |
| ida = &port->out_hopids; |
| } |
| |
| /* |
| * NHI can use HopIDs 1-max for other adapters HopIDs 0-7 are |
| * reserved. |
| */ |
| if (!tb_port_is_nhi(port) && min_hopid < TB_PATH_MIN_HOPID) |
| min_hopid = TB_PATH_MIN_HOPID; |
| |
| if (max_hopid < 0 || max_hopid > port_max_hopid) |
| max_hopid = port_max_hopid; |
| |
| return ida_alloc_range(ida, min_hopid, max_hopid, GFP_KERNEL); |
| } |
| |
| /** |
| * tb_port_alloc_in_hopid() - Allocate input HopID from port |
| * @port: Port to allocate HopID for |
| * @min_hopid: Minimum acceptable input HopID |
| * @max_hopid: Maximum acceptable input HopID |
| * |
| * Return: HopID between @min_hopid and @max_hopid or negative errno in |
| * case of error. |
| */ |
| int tb_port_alloc_in_hopid(struct tb_port *port, int min_hopid, int max_hopid) |
| { |
| return tb_port_alloc_hopid(port, true, min_hopid, max_hopid); |
| } |
| |
| /** |
| * tb_port_alloc_out_hopid() - Allocate output HopID from port |
| * @port: Port to allocate HopID for |
| * @min_hopid: Minimum acceptable output HopID |
| * @max_hopid: Maximum acceptable output HopID |
| * |
| * Return: HopID between @min_hopid and @max_hopid or negative errno in |
| * case of error. |
| */ |
| int tb_port_alloc_out_hopid(struct tb_port *port, int min_hopid, int max_hopid) |
| { |
| return tb_port_alloc_hopid(port, false, min_hopid, max_hopid); |
| } |
| |
| /** |
| * tb_port_release_in_hopid() - Release allocated input HopID from port |
| * @port: Port whose HopID to release |
| * @hopid: HopID to release |
| */ |
| void tb_port_release_in_hopid(struct tb_port *port, int hopid) |
| { |
| ida_free(&port->in_hopids, hopid); |
| } |
| |
| /** |
| * tb_port_release_out_hopid() - Release allocated output HopID from port |
| * @port: Port whose HopID to release |
| * @hopid: HopID to release |
| */ |
| void tb_port_release_out_hopid(struct tb_port *port, int hopid) |
| { |
| ida_free(&port->out_hopids, hopid); |
| } |
| |
| static inline bool tb_switch_is_reachable(const struct tb_switch *parent, |
| const struct tb_switch *sw) |
| { |
| u64 mask = (1ULL << parent->config.depth * 8) - 1; |
| return (tb_route(parent) & mask) == (tb_route(sw) & mask); |
| } |
| |
| /** |
| * tb_next_port_on_path() - Return next port for given port on a path |
| * @start: Start port of the walk |
| * @end: End port of the walk |
| * @prev: Previous port (%NULL if this is the first) |
| * |
| * This function can be used to walk from one port to another if they |
| * are connected through zero or more switches. If the @prev is dual |
| * link port, the function follows that link and returns another end on |
| * that same link. |
| * |
| * If the @end port has been reached, return %NULL. |
| * |
| * Domain tb->lock must be held when this function is called. |
| */ |
| struct tb_port *tb_next_port_on_path(struct tb_port *start, struct tb_port *end, |
| struct tb_port *prev) |
| { |
| struct tb_port *next; |
| |
| if (!prev) |
| return start; |
| |
| if (prev->sw == end->sw) { |
| if (prev == end) |
| return NULL; |
| return end; |
| } |
| |
| if (tb_switch_is_reachable(prev->sw, end->sw)) { |
| next = tb_port_at(tb_route(end->sw), prev->sw); |
| /* Walk down the topology if next == prev */ |
| if (prev->remote && |
| (next == prev || next->dual_link_port == prev)) |
| next = prev->remote; |
| } else { |
| if (tb_is_upstream_port(prev)) { |
| next = prev->remote; |
| } else { |
| next = tb_upstream_port(prev->sw); |
| /* |
| * Keep the same link if prev and next are both |
| * dual link ports. |
| */ |
| if (next->dual_link_port && |
| next->link_nr != prev->link_nr) { |
| next = next->dual_link_port; |
| } |
| } |
| } |
| |
| return next != prev ? next : NULL; |
| } |
| |
| /** |
| * tb_port_get_link_speed() - Get current link speed |
| * @port: Port to check (USB4 or CIO) |
| * |
| * Returns link speed in Gb/s or negative errno in case of failure. |
| */ |
| int tb_port_get_link_speed(struct tb_port *port) |
| { |
| u32 val, speed; |
| int ret; |
| |
| if (!port->cap_phy) |
| return -EINVAL; |
| |
| ret = tb_port_read(port, &val, TB_CFG_PORT, |
| port->cap_phy + LANE_ADP_CS_1, 1); |
| if (ret) |
| return ret; |
| |
| speed = (val & LANE_ADP_CS_1_CURRENT_SPEED_MASK) >> |
| LANE_ADP_CS_1_CURRENT_SPEED_SHIFT; |
| |
| switch (speed) { |
| case LANE_ADP_CS_1_CURRENT_SPEED_GEN4: |
| return 40; |
| case LANE_ADP_CS_1_CURRENT_SPEED_GEN3: |
| return 20; |
| default: |
| return 10; |
| } |
| } |
| |
| /** |
| * tb_port_get_link_generation() - Returns link generation |
| * @port: Lane adapter |
| * |
| * Returns link generation as number or negative errno in case of |
| * failure. Does not distinguish between Thunderbolt 1 and Thunderbolt 2 |
| * links so for those always returns 2. |
| */ |
| int tb_port_get_link_generation(struct tb_port *port) |
| { |
| int ret; |
| |
| ret = tb_port_get_link_speed(port); |
| if (ret < 0) |
| return ret; |
| |
| switch (ret) { |
| case 40: |
| return 4; |
| case 20: |
| return 3; |
| default: |
| return 2; |
| } |
| } |
| |
| /** |
| * tb_port_get_link_width() - Get current link width |
| * @port: Port to check (USB4 or CIO) |
| * |
| * Returns link width. Return the link width as encoded in &enum |
| * tb_link_width or negative errno in case of failure. |
| */ |
| int tb_port_get_link_width(struct tb_port *port) |
| { |
| u32 val; |
| int ret; |
| |
| if (!port->cap_phy) |
| return -EINVAL; |
| |
| ret = tb_port_read(port, &val, TB_CFG_PORT, |
| port->cap_phy + LANE_ADP_CS_1, 1); |
| if (ret) |
| return ret; |
| |
| /* Matches the values in enum tb_link_width */ |
| return (val & LANE_ADP_CS_1_CURRENT_WIDTH_MASK) >> |
| LANE_ADP_CS_1_CURRENT_WIDTH_SHIFT; |
| } |
| |
| /** |
| * tb_port_width_supported() - Is the given link width supported |
| * @port: Port to check |
| * @width: Widths to check (bitmask) |
| * |
| * Can be called to any lane adapter. Checks if given @width is |
| * supported by the hardware and returns %true if it is. |
| */ |
| bool tb_port_width_supported(struct tb_port *port, unsigned int width) |
| { |
| u32 phy, widths; |
| int ret; |
| |
| if (!port->cap_phy) |
| return false; |
| |
| if (width & (TB_LINK_WIDTH_ASYM_TX | TB_LINK_WIDTH_ASYM_RX)) { |
| if (tb_port_get_link_generation(port) < 4 || |
| !usb4_port_asym_supported(port)) |
| return false; |
| } |
| |
| ret = tb_port_read(port, &phy, TB_CFG_PORT, |
| port->cap_phy + LANE_ADP_CS_0, 1); |
| if (ret) |
| return false; |
| |
| /* |
| * The field encoding is the same as &enum tb_link_width (which is |
| * passed to @width). |
| */ |
| widths = FIELD_GET(LANE_ADP_CS_0_SUPPORTED_WIDTH_MASK, phy); |
| return widths & width; |
| } |
| |
| /** |
| * tb_port_set_link_width() - Set target link width of the lane adapter |
| * @port: Lane adapter |
| * @width: Target link width |
| * |
| * Sets the target link width of the lane adapter to @width. Does not |
| * enable/disable lane bonding. For that call tb_port_set_lane_bonding(). |
| * |
| * Return: %0 in case of success and negative errno in case of error |
| */ |
| int tb_port_set_link_width(struct tb_port *port, enum tb_link_width width) |
| { |
| u32 val; |
| int ret; |
| |
| if (!port->cap_phy) |
| return -EINVAL; |
| |
| ret = tb_port_read(port, &val, TB_CFG_PORT, |
| port->cap_phy + LANE_ADP_CS_1, 1); |
| if (ret) |
| return ret; |
| |
| val &= ~LANE_ADP_CS_1_TARGET_WIDTH_MASK; |
| switch (width) { |
| case TB_LINK_WIDTH_SINGLE: |
| /* Gen 4 link cannot be single */ |
| if (tb_port_get_link_generation(port) >= 4) |
| return -EOPNOTSUPP; |
| val |= LANE_ADP_CS_1_TARGET_WIDTH_SINGLE << |
| LANE_ADP_CS_1_TARGET_WIDTH_SHIFT; |
| break; |
| |
| case TB_LINK_WIDTH_DUAL: |
| if (tb_port_get_link_generation(port) >= 4) |
| return usb4_port_asym_set_link_width(port, width); |
| val |= LANE_ADP_CS_1_TARGET_WIDTH_DUAL << |
| LANE_ADP_CS_1_TARGET_WIDTH_SHIFT; |
| break; |
| |
| case TB_LINK_WIDTH_ASYM_TX: |
| case TB_LINK_WIDTH_ASYM_RX: |
| return usb4_port_asym_set_link_width(port, width); |
| |
| default: |
| return -EINVAL; |
| } |
| |
| return tb_port_write(port, &val, TB_CFG_PORT, |
| port->cap_phy + LANE_ADP_CS_1, 1); |
| } |
| |
| /** |
| * tb_port_set_lane_bonding() - Enable/disable lane bonding |
| * @port: Lane adapter |
| * @bonding: enable/disable bonding |
| * |
| * Enables or disables lane bonding. This should be called after target |
| * link width has been set (tb_port_set_link_width()). Note in most |
| * cases one should use tb_port_lane_bonding_enable() instead to enable |
| * lane bonding. |
| * |
| * Return: %0 in case of success and negative errno in case of error |
| */ |
| static int tb_port_set_lane_bonding(struct tb_port *port, bool bonding) |
| { |
| u32 val; |
| int ret; |
| |
| if (!port->cap_phy) |
| return -EINVAL; |
| |
| ret = tb_port_read(port, &val, TB_CFG_PORT, |
| port->cap_phy + LANE_ADP_CS_1, 1); |
| if (ret) |
| return ret; |
| |
| if (bonding) |
| val |= LANE_ADP_CS_1_LB; |
| else |
| val &= ~LANE_ADP_CS_1_LB; |
| |
| return tb_port_write(port, &val, TB_CFG_PORT, |
| port->cap_phy + LANE_ADP_CS_1, 1); |
| } |
| |
| /** |
| * tb_port_lane_bonding_enable() - Enable bonding on port |
| * @port: port to enable |
| * |
| * Enable bonding by setting the link width of the port and the other |
| * port in case of dual link port. Does not wait for the link to |
| * actually reach the bonded state so caller needs to call |
| * tb_port_wait_for_link_width() before enabling any paths through the |
| * link to make sure the link is in expected state. |
| * |
| * Return: %0 in case of success and negative errno in case of error |
| */ |
| int tb_port_lane_bonding_enable(struct tb_port *port) |
| { |
| enum tb_link_width width; |
| int ret; |
| |
| /* |
| * Enable lane bonding for both links if not already enabled by |
| * for example the boot firmware. |
| */ |
| width = tb_port_get_link_width(port); |
| if (width == TB_LINK_WIDTH_SINGLE) { |
| ret = tb_port_set_link_width(port, TB_LINK_WIDTH_DUAL); |
| if (ret) |
| goto err_lane0; |
| } |
| |
| width = tb_port_get_link_width(port->dual_link_port); |
| if (width == TB_LINK_WIDTH_SINGLE) { |
| ret = tb_port_set_link_width(port->dual_link_port, |
| TB_LINK_WIDTH_DUAL); |
| if (ret) |
| goto err_lane1; |
| } |
| |
| /* |
| * Only set bonding if the link was not already bonded. This |
| * avoids the lane adapter to re-enter bonding state. |
| */ |
| if (width == TB_LINK_WIDTH_SINGLE && !tb_is_upstream_port(port)) { |
| ret = tb_port_set_lane_bonding(port, true); |
| if (ret) |
| goto err_lane1; |
| } |
| |
| /* |
| * When lane 0 bonding is set it will affect lane 1 too so |
| * update both. |
| */ |
| port->bonded = true; |
| port->dual_link_port->bonded = true; |
| |
| return 0; |
| |
| err_lane1: |
| tb_port_set_link_width(port->dual_link_port, TB_LINK_WIDTH_SINGLE); |
| err_lane0: |
| tb_port_set_link_width(port, TB_LINK_WIDTH_SINGLE); |
| |
| return ret; |
| } |
| |
| /** |
| * tb_port_lane_bonding_disable() - Disable bonding on port |
| * @port: port to disable |
| * |
| * Disable bonding by setting the link width of the port and the |
| * other port in case of dual link port. |
| */ |
| void tb_port_lane_bonding_disable(struct tb_port *port) |
| { |
| tb_port_set_lane_bonding(port, false); |
| tb_port_set_link_width(port->dual_link_port, TB_LINK_WIDTH_SINGLE); |
| tb_port_set_link_width(port, TB_LINK_WIDTH_SINGLE); |
| port->dual_link_port->bonded = false; |
| port->bonded = false; |
| } |
| |
| /** |
| * tb_port_wait_for_link_width() - Wait until link reaches specific width |
| * @port: Port to wait for |
| * @width: Expected link width (bitmask) |
| * @timeout_msec: Timeout in ms how long to wait |
| * |
| * Should be used after both ends of the link have been bonded (or |
| * bonding has been disabled) to wait until the link actually reaches |
| * the expected state. Returns %-ETIMEDOUT if the width was not reached |
| * within the given timeout, %0 if it did. Can be passed a mask of |
| * expected widths and succeeds if any of the widths is reached. |
| */ |
| int tb_port_wait_for_link_width(struct tb_port *port, unsigned int width, |
| int timeout_msec) |
| { |
| ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec); |
| int ret; |
| |
| /* Gen 4 link does not support single lane */ |
| if ((width & TB_LINK_WIDTH_SINGLE) && |
| tb_port_get_link_generation(port) >= 4) |
| return -EOPNOTSUPP; |
| |
| do { |
| ret = tb_port_get_link_width(port); |
| if (ret < 0) { |
| /* |
| * Sometimes we get port locked error when |
| * polling the lanes so we can ignore it and |
| * retry. |
| */ |
| if (ret != -EACCES) |
| return ret; |
| } else if (ret & width) { |
| return 0; |
| } |
| |
| usleep_range(1000, 2000); |
| } while (ktime_before(ktime_get(), timeout)); |
| |
| return -ETIMEDOUT; |
| } |
| |
| static int tb_port_do_update_credits(struct tb_port *port) |
| { |
| u32 nfc_credits; |
| int ret; |
| |
| ret = tb_port_read(port, &nfc_credits, TB_CFG_PORT, ADP_CS_4, 1); |
| if (ret) |
| return ret; |
| |
| if (nfc_credits != port->config.nfc_credits) { |
| u32 total; |
| |
| total = (nfc_credits & ADP_CS_4_TOTAL_BUFFERS_MASK) >> |
| ADP_CS_4_TOTAL_BUFFERS_SHIFT; |
| |
| tb_port_dbg(port, "total credits changed %u -> %u\n", |
| port->total_credits, total); |
| |
| port->config.nfc_credits = nfc_credits; |
| port->total_credits = total; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * tb_port_update_credits() - Re-read port total credits |
| * @port: Port to update |
| * |
| * After the link is bonded (or bonding was disabled) the port total |
| * credits may change, so this function needs to be called to re-read |
| * the credits. Updates also the second lane adapter. |
| */ |
| int tb_port_update_credits(struct tb_port *port) |
| { |
| int ret; |
| |
| ret = tb_port_do_update_credits(port); |
| if (ret) |
| return ret; |
| |
| if (!port->dual_link_port) |
| return 0; |
| return tb_port_do_update_credits(port->dual_link_port); |
| } |
| |
| static int tb_port_start_lane_initialization(struct tb_port *port) |
| { |
| int ret; |
| |
| if (tb_switch_is_usb4(port->sw)) |
| return 0; |
| |
| ret = tb_lc_start_lane_initialization(port); |
| return ret == -EINVAL ? 0 : ret; |
| } |
| |
| /* |
| * Returns true if the port had something (router, XDomain) connected |
| * before suspend. |
| */ |
| static bool tb_port_resume(struct tb_port *port) |
| { |
| bool has_remote = tb_port_has_remote(port); |
| |
| if (port->usb4) { |
| usb4_port_device_resume(port->usb4); |
| } else if (!has_remote) { |
| /* |
| * For disconnected downstream lane adapters start lane |
| * initialization now so we detect future connects. |
| * |
| * For XDomain start the lane initialzation now so the |
| * link gets re-established. |
| * |
| * This is only needed for non-USB4 ports. |
| */ |
| if (!tb_is_upstream_port(port) || port->xdomain) |
| tb_port_start_lane_initialization(port); |
| } |
| |
| return has_remote || port->xdomain; |
| } |
| |
| /** |
| * tb_port_is_enabled() - Is the adapter port enabled |
| * @port: Port to check |
| */ |
| bool tb_port_is_enabled(struct tb_port *port) |
| { |
| switch (port->config.type) { |
| case TB_TYPE_PCIE_UP: |
| case TB_TYPE_PCIE_DOWN: |
| return tb_pci_port_is_enabled(port); |
| |
| case TB_TYPE_DP_HDMI_IN: |
| case TB_TYPE_DP_HDMI_OUT: |
| return tb_dp_port_is_enabled(port); |
| |
| case TB_TYPE_USB3_UP: |
| case TB_TYPE_USB3_DOWN: |
| return tb_usb3_port_is_enabled(port); |
| |
| default: |
| return false; |
| } |
| } |
| |
| /** |
| * tb_usb3_port_is_enabled() - Is the USB3 adapter port enabled |
| * @port: USB3 adapter port to check |
| */ |
| bool tb_usb3_port_is_enabled(struct tb_port *port) |
| { |
| u32 data; |
| |
| if (tb_port_read(port, &data, TB_CFG_PORT, |
| port->cap_adap + ADP_USB3_CS_0, 1)) |
| return false; |
| |
| return !!(data & ADP_USB3_CS_0_PE); |
| } |
| |
| /** |
| * tb_usb3_port_enable() - Enable USB3 adapter port |
| * @port: USB3 adapter port to enable |
| * @enable: Enable/disable the USB3 adapter |
| */ |
| int tb_usb3_port_enable(struct tb_port *port, bool enable) |
| { |
| u32 word = enable ? (ADP_USB3_CS_0_PE | ADP_USB3_CS_0_V) |
| : ADP_USB3_CS_0_V; |
| |
| if (!port->cap_adap) |
| return -ENXIO; |
| return tb_port_write(port, &word, TB_CFG_PORT, |
| port->cap_adap + ADP_USB3_CS_0, 1); |
| } |
| |
| /** |
| * tb_pci_port_is_enabled() - Is the PCIe adapter port enabled |
| * @port: PCIe port to check |
| */ |
| bool tb_pci_port_is_enabled(struct tb_port *port) |
| { |
| u32 data; |
| |
| if (tb_port_read(port, &data, TB_CFG_PORT, |
| port->cap_adap + ADP_PCIE_CS_0, 1)) |
| return false; |
| |
| return !!(data & ADP_PCIE_CS_0_PE); |
| } |
| |
| /** |
| * tb_pci_port_enable() - Enable PCIe adapter port |
| * @port: PCIe port to enable |
| * @enable: Enable/disable the PCIe adapter |
| */ |
| int tb_pci_port_enable(struct tb_port *port, bool enable) |
| { |
| u32 word = enable ? ADP_PCIE_CS_0_PE : 0x0; |
| if (!port->cap_adap) |
| return -ENXIO; |
| return tb_port_write(port, &word, TB_CFG_PORT, |
| port->cap_adap + ADP_PCIE_CS_0, 1); |
| } |
| |
| /** |
| * tb_dp_port_hpd_is_active() - Is HPD already active |
| * @port: DP out port to check |
| * |
| * Checks if the DP OUT adapter port has HPD bit already set. |
| */ |
| int tb_dp_port_hpd_is_active(struct tb_port *port) |
| { |
| u32 data; |
| int ret; |
| |
| ret = tb_port_read(port, &data, TB_CFG_PORT, |
| port->cap_adap + ADP_DP_CS_2, 1); |
| if (ret) |
| return ret; |
| |
| return !!(data & ADP_DP_CS_2_HPD); |
| } |
| |
| /** |
| * tb_dp_port_hpd_clear() - Clear HPD from DP IN port |
| * @port: Port to clear HPD |
| * |
| * If the DP IN port has HPD set, this function can be used to clear it. |
| */ |
| int tb_dp_port_hpd_clear(struct tb_port *port) |
| { |
| u32 data; |
| int ret; |
| |
| ret = tb_port_read(port, &data, TB_CFG_PORT, |
| port->cap_adap + ADP_DP_CS_3, 1); |
| if (ret) |
| return ret; |
| |
| data |= ADP_DP_CS_3_HPDC; |
| return tb_port_write(port, &data, TB_CFG_PORT, |
| port->cap_adap + ADP_DP_CS_3, 1); |
| } |
| |
| /** |
| * tb_dp_port_set_hops() - Set video/aux Hop IDs for DP port |
| * @port: DP IN/OUT port to set hops |
| * @video: Video Hop ID |
| * @aux_tx: AUX TX Hop ID |
| * @aux_rx: AUX RX Hop ID |
| * |
| * Programs specified Hop IDs for DP IN/OUT port. Can be called for USB4 |
| * router DP adapters too but does not program the values as the fields |
| * are read-only. |
| */ |
| int tb_dp_port_set_hops(struct tb_port *port, unsigned int video, |
| unsigned int aux_tx, unsigned int aux_rx) |
| { |
| u32 data[2]; |
| int ret; |
| |
| if (tb_switch_is_usb4(port->sw)) |
| return 0; |
| |
| ret = tb_port_read(port, data, TB_CFG_PORT, |
| port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data)); |
| if (ret) |
| return ret; |
| |
| data[0] &= ~ADP_DP_CS_0_VIDEO_HOPID_MASK; |
| data[1] &= ~ADP_DP_CS_1_AUX_RX_HOPID_MASK; |
| data[1] &= ~ADP_DP_CS_1_AUX_RX_HOPID_MASK; |
| |
| data[0] |= (video << ADP_DP_CS_0_VIDEO_HOPID_SHIFT) & |
| ADP_DP_CS_0_VIDEO_HOPID_MASK; |
| data[1] |= aux_tx & ADP_DP_CS_1_AUX_TX_HOPID_MASK; |
| data[1] |= (aux_rx << ADP_DP_CS_1_AUX_RX_HOPID_SHIFT) & |
| ADP_DP_CS_1_AUX_RX_HOPID_MASK; |
| |
| return tb_port_write(port, data, TB_CFG_PORT, |
| port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data)); |
| } |
| |
| /** |
| * tb_dp_port_is_enabled() - Is DP adapter port enabled |
| * @port: DP adapter port to check |
| */ |
| bool tb_dp_port_is_enabled(struct tb_port *port) |
| { |
| u32 data[2]; |
| |
| if (tb_port_read(port, data, TB_CFG_PORT, port->cap_adap + ADP_DP_CS_0, |
| ARRAY_SIZE(data))) |
| return false; |
| |
| return !!(data[0] & (ADP_DP_CS_0_VE | ADP_DP_CS_0_AE)); |
| } |
| |
| /** |
| * tb_dp_port_enable() - Enables/disables DP paths of a port |
| * @port: DP IN/OUT port |
| * @enable: Enable/disable DP path |
| * |
| * Once Hop IDs are programmed DP paths can be enabled or disabled by |
| * calling this function. |
| */ |
| int tb_dp_port_enable(struct tb_port *port, bool enable) |
| { |
| u32 data[2]; |
| int ret; |
| |
| ret = tb_port_read(port, data, TB_CFG_PORT, |
| port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data)); |
| if (ret) |
| return ret; |
| |
| if (enable) |
| data[0] |= ADP_DP_CS_0_VE | ADP_DP_CS_0_AE; |
| else |
| data[0] &= ~(ADP_DP_CS_0_VE | ADP_DP_CS_0_AE); |
| |
| return tb_port_write(port, data, TB_CFG_PORT, |
| port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data)); |
| } |
| |
| /* switch utility functions */ |
| |
| static const char *tb_switch_generation_name(const struct tb_switch *sw) |
| { |
| switch (sw->generation) { |
| case 1: |
| return "Thunderbolt 1"; |
| case 2: |
| return "Thunderbolt 2"; |
| case 3: |
| return "Thunderbolt 3"; |
| case 4: |
| return "USB4"; |
| default: |
| return "Unknown"; |
| } |
| } |
| |
| static void tb_dump_switch(const struct tb *tb, const struct tb_switch *sw) |
| { |
| const struct tb_regs_switch_header *regs = &sw->config; |
| |
| tb_dbg(tb, " %s Switch: %x:%x (Revision: %d, TB Version: %d)\n", |
| tb_switch_generation_name(sw), regs->vendor_id, regs->device_id, |
| regs->revision, regs->thunderbolt_version); |
| tb_dbg(tb, " Max Port Number: %d\n", regs->max_port_number); |
| tb_dbg(tb, " Config:\n"); |
| tb_dbg(tb, |
| " Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n", |
| regs->upstream_port_number, regs->depth, |
| (((u64) regs->route_hi) << 32) | regs->route_lo, |
| regs->enabled, regs->plug_events_delay); |
| tb_dbg(tb, " unknown1: %#x unknown4: %#x\n", |
| regs->__unknown1, regs->__unknown4); |
| } |
| |
| static int tb_switch_reset_host(struct tb_switch *sw) |
| { |
| if (sw->generation > 1) { |
| struct tb_port *port; |
| |
| tb_switch_for_each_port(sw, port) { |
| int i, ret; |
| |
| /* |
| * For lane adapters we issue downstream port |
| * reset and clear up path config spaces. |
| * |
| * For protocol adapters we disable the path and |
| * clear path config space one by one (from 8 to |
| * Max Input HopID of the adapter). |
| */ |
| if (tb_port_is_null(port) && !tb_is_upstream_port(port)) { |
| ret = tb_port_reset(port); |
| if (ret) |
| return ret; |
| } else if (tb_port_is_usb3_down(port) || |
| tb_port_is_usb3_up(port)) { |
| tb_usb3_port_enable(port, false); |
| } else if (tb_port_is_dpin(port) || |
| tb_port_is_dpout(port)) { |
| tb_dp_port_enable(port, false); |
| } else if (tb_port_is_pcie_down(port) || |
| tb_port_is_pcie_up(port)) { |
| tb_pci_port_enable(port, false); |
| } else { |
| continue; |
| } |
| |
| /* Cleanup path config space of protocol adapter */ |
| for (i = TB_PATH_MIN_HOPID; |
| i <= port->config.max_in_hop_id; i++) { |
| ret = tb_path_deactivate_hop(port, i); |
| if (ret) |
| return ret; |
| } |
| } |
| } else { |
| struct tb_cfg_result res; |
| |
| /* Thunderbolt 1 uses the "reset" config space packet */ |
| res.err = tb_sw_write(sw, ((u32 *) &sw->config) + 2, |
| TB_CFG_SWITCH, 2, 2); |
| if (res.err) |
| return res.err; |
| res = tb_cfg_reset(sw->tb->ctl, tb_route(sw)); |
| if (res.err > 0) |
| return -EIO; |
| else if (res.err < 0) |
| return res.err; |
| } |
| |
| return 0; |
| } |
| |
| static int tb_switch_reset_device(struct tb_switch *sw) |
| { |
| return tb_port_reset(tb_switch_downstream_port(sw)); |
| } |
| |
| static bool tb_switch_enumerated(struct tb_switch *sw) |
| { |
| u32 val; |
| int ret; |
| |
| /* |
| * Read directly from the hardware because we use this also |
| * during system sleep where sw->config.enabled is already set |
| * by us. |
| */ |
| ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, ROUTER_CS_3, 1); |
| if (ret) |
| return false; |
| |
| return !!(val & ROUTER_CS_3_V); |
| } |
| |
| /** |
| * tb_switch_reset() - Perform reset to the router |
| * @sw: Router to reset |
| * |
| * Issues reset to the router @sw. Can be used for any router. For host |
| * routers, resets all the downstream ports and cleans up path config |
| * spaces accordingly. For device routers issues downstream port reset |
| * through the parent router, so as side effect there will be unplug |
| * soon after this is finished. |
| * |
| * If the router is not enumerated does nothing. |
| * |
| * Returns %0 on success or negative errno in case of failure. |
| */ |
| int tb_switch_reset(struct tb_switch *sw) |
| { |
| int ret; |
| |
| /* |
| * We cannot access the port config spaces unless the router is |
| * already enumerated. If the router is not enumerated it is |
| * equal to being reset so we can skip that here. |
| */ |
| if (!tb_switch_enumerated(sw)) |
| return 0; |
| |
| tb_sw_dbg(sw, "resetting\n"); |
| |
| if (tb_route(sw)) |
| ret = tb_switch_reset_device(sw); |
| else |
| ret = tb_switch_reset_host(sw); |
| |
| if (ret) |
| tb_sw_warn(sw, "failed to reset\n"); |
| |
| return ret; |
| } |
| |
| /** |
| * tb_switch_wait_for_bit() - Wait for specified value of bits in offset |
| * @sw: Router to read the offset value from |
| * @offset: Offset in the router config space to read from |
| * @bit: Bit mask in the offset to wait for |
| * @value: Value of the bits to wait for |
| * @timeout_msec: Timeout in ms how long to wait |
| * |
| * Wait till the specified bits in specified offset reach specified value. |
| * Returns %0 in case of success, %-ETIMEDOUT if the @value was not reached |
| * within the given timeout or a negative errno in case of failure. |
| */ |
| int tb_switch_wait_for_bit(struct tb_switch *sw, u32 offset, u32 bit, |
| u32 value, int timeout_msec) |
| { |
| ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec); |
| |
| do { |
| u32 val; |
| int ret; |
| |
| ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, offset, 1); |
| if (ret) |
| return ret; |
| |
| if ((val & bit) == value) |
| return 0; |
| |
| usleep_range(50, 100); |
| } while (ktime_before(ktime_get(), timeout)); |
| |
| return -ETIMEDOUT; |
| } |
| |
| /* |
| * tb_plug_events_active() - enable/disable plug events on a switch |
| * |
| * Also configures a sane plug_events_delay of 255ms. |
| * |
| * Return: Returns 0 on success or an error code on failure. |
| */ |
| static int tb_plug_events_active(struct tb_switch *sw, bool active) |
| { |
| u32 data; |
| int res; |
| |
| if (tb_switch_is_icm(sw) || tb_switch_is_usb4(sw)) |
| return 0; |
| |
| sw->config.plug_events_delay = 0xff; |
| res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1); |
| if (res) |
| return res; |
| |
| res = tb_sw_read(sw, &data, TB_CFG_SWITCH, sw->cap_plug_events + 1, 1); |
| if (res) |
| return res; |
| |
| if (active) { |
| data = data & 0xFFFFFF83; |
| switch (sw->config.device_id) { |
| case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE: |
| case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE: |
| case PCI_DEVICE_ID_INTEL_PORT_RIDGE: |
| break; |
| default: |
| /* |
| * Skip Alpine Ridge, it needs to have vendor |
| * specific USB hotplug event enabled for the |
| * internal xHCI to work. |
| */ |
| if (!tb_switch_is_alpine_ridge(sw)) |
| data |= TB_PLUG_EVENTS_USB_DISABLE; |
| } |
| } else { |
| data = data | 0x7c; |
| } |
| return tb_sw_write(sw, &data, TB_CFG_SWITCH, |
| sw->cap_plug_events + 1, 1); |
| } |
| |
| static ssize_t authorized_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct tb_switch *sw = tb_to_switch(dev); |
| |
| return sysfs_emit(buf, "%u\n", sw->authorized); |
| } |
| |
| static int disapprove_switch(struct device *dev, void *not_used) |
| { |
| char *envp[] = { "AUTHORIZED=0", NULL }; |
| struct tb_switch *sw; |
| |
| sw = tb_to_switch(dev); |
| if (sw && sw->authorized) { |
| int ret; |
| |
| /* First children */ |
| ret = device_for_each_child_reverse(&sw->dev, NULL, disapprove_switch); |
| if (ret) |
| return ret; |
| |
| ret = tb_domain_disapprove_switch(sw->tb, sw); |
| if (ret) |
| return ret; |
| |
| sw->authorized = 0; |
| kobject_uevent_env(&sw->dev.kobj, KOBJ_CHANGE, envp); |
| } |
| |
| return 0; |
| } |
| |
| static int tb_switch_set_authorized(struct tb_switch *sw, unsigned int val) |
| { |
| char envp_string[13]; |
| int ret = -EINVAL; |
| char *envp[] = { envp_string, NULL }; |
| |
| if (!mutex_trylock(&sw->tb->lock)) |
| return restart_syscall(); |
| |
| if (!!sw->authorized == !!val) |
| goto unlock; |
| |
| switch (val) { |
| /* Disapprove switch */ |
| case 0: |
| if (tb_route(sw)) { |
| ret = disapprove_switch(&sw->dev, NULL); |
| goto unlock; |
| } |
| break; |
| |
| /* Approve switch */ |
| case 1: |
| if (sw->key) |
| ret = tb_domain_approve_switch_key(sw->tb, sw); |
| else |
| ret = tb_domain_approve_switch(sw->tb, sw); |
| break; |
| |
| /* Challenge switch */ |
| case 2: |
| if (sw->key) |
| ret = tb_domain_challenge_switch_key(sw->tb, sw); |
| break; |
| |
| default: |
| break; |
| } |
| |
| if (!ret) { |
| sw->authorized = val; |
| /* |
| * Notify status change to the userspace, informing the new |
| * value of /sys/bus/thunderbolt/devices/.../authorized. |
| */ |
| sprintf(envp_string, "AUTHORIZED=%u", sw->authorized); |
| kobject_uevent_env(&sw->dev.kobj, KOBJ_CHANGE, envp); |
| } |
| |
| unlock: |
| mutex_unlock(&sw->tb->lock); |
| return ret; |
| } |
| |
| static ssize_t authorized_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| struct tb_switch *sw = tb_to_switch(dev); |
| unsigned int val; |
| ssize_t ret; |
| |
| ret = kstrtouint(buf, 0, &val); |
| if (ret) |
| return ret; |
| if (val > 2) |
| return -EINVAL; |
| |
| pm_runtime_get_sync(&sw->dev); |
| ret = tb_switch_set_authorized(sw, val); |
| pm_runtime_mark_last_busy(&sw->dev); |
| pm_runtime_put_autosuspend(&sw->dev); |
| |
| return ret ? ret : count; |
| } |
| static DEVICE_ATTR_RW(authorized); |
| |
| static ssize_t boot_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct tb_switch *sw = tb_to_switch(dev); |
| |
| return sysfs_emit(buf, "%u\n", sw->boot); |
| } |
| static DEVICE_ATTR_RO(boot); |
| |
| static ssize_t device_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct tb_switch *sw = tb_to_switch(dev); |
| |
| return sysfs_emit(buf, "%#x\n", sw->device); |
| } |
| static DEVICE_ATTR_RO(device); |
| |
| static ssize_t |
| device_name_show(struct device *dev, struct device_attribute *attr, char *buf) |
| { |
| struct tb_switch *sw = tb_to_switch(dev); |
| |
| return sysfs_emit(buf, "%s\n", sw->device_name ?: ""); |
| } |
| static DEVICE_ATTR_RO(device_name); |
| |
| static ssize_t |
| generation_show(struct device *dev, struct device_attribute *attr, char *buf) |
| { |
| struct tb_switch *sw = tb_to_switch(dev); |
| |
| return sysfs_emit(buf, "%u\n", sw->generation); |
| } |
| static DEVICE_ATTR_RO(generation); |
| |
| static ssize_t key_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct tb_switch *sw = tb_to_switch(dev); |
| ssize_t ret; |
| |
| if (!mutex_trylock(&sw->tb->lock)) |
| return restart_syscall(); |
| |
| if (sw->key) |
| ret = sysfs_emit(buf, "%*phN\n", TB_SWITCH_KEY_SIZE, sw->key); |
| else |
| ret = sysfs_emit(buf, "\n"); |
| |
| mutex_unlock(&sw->tb->lock); |
| return ret; |
| } |
| |
| static ssize_t key_store(struct device *dev, struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| struct tb_switch *sw = tb_to_switch(dev); |
| u8 key[TB_SWITCH_KEY_SIZE]; |
| ssize_t ret = count; |
| bool clear = false; |
| |
| if (!strcmp(buf, "\n")) |
| clear = true; |
| else if (hex2bin(key, buf, sizeof(key))) |
| return -EINVAL; |
| |
| if (!mutex_trylock(&sw->tb->lock)) |
| return restart_syscall(); |
| |
| if (sw->authorized) { |
| ret = -EBUSY; |
| } else { |
| kfree(sw->key); |
| if (clear) { |
| sw->key = NULL; |
| } else { |
| sw->key = kmemdup(key, sizeof(key), GFP_KERNEL); |
| if (!sw->key) |
| ret = -ENOMEM; |
| } |
| } |
| |
| mutex_unlock(&sw->tb->lock); |
| return ret; |
| } |
| static DEVICE_ATTR(key, 0600, key_show, key_store); |
| |
| static ssize_t speed_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct tb_switch *sw = tb_to_switch(dev); |
| |
| return sysfs_emit(buf, "%u.0 Gb/s\n", sw->link_speed); |
| } |
| |
| /* |
| * Currently all lanes must run at the same speed but we expose here |
| * both directions to allow possible asymmetric links in the future. |
| */ |
| static DEVICE_ATTR(rx_speed, 0444, speed_show, NULL); |
| static DEVICE_ATTR(tx_speed, 0444, speed_show, NULL); |
| |
| static ssize_t rx_lanes_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct tb_switch *sw = tb_to_switch(dev); |
| unsigned int width; |
| |
| switch (sw->link_width) { |
| case TB_LINK_WIDTH_SINGLE: |
| case TB_LINK_WIDTH_ASYM_TX: |
| width = 1; |
| break; |
| case TB_LINK_WIDTH_DUAL: |
| width = 2; |
| break; |
| case TB_LINK_WIDTH_ASYM_RX: |
| width = 3; |
| break; |
| default: |
| WARN_ON_ONCE(1); |
| return -EINVAL; |
| } |
| |
| return sysfs_emit(buf, "%u\n", width); |
| } |
| static DEVICE_ATTR(rx_lanes, 0444, rx_lanes_show, NULL); |
| |
| static ssize_t tx_lanes_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct tb_switch *sw = tb_to_switch(dev); |
| unsigned int width; |
| |
| switch (sw->link_width) { |
| case TB_LINK_WIDTH_SINGLE: |
| case TB_LINK_WIDTH_ASYM_RX: |
| width = 1; |
| break; |
| case TB_LINK_WIDTH_DUAL: |
| width = 2; |
| break; |
| case TB_LINK_WIDTH_ASYM_TX: |
| width = 3; |
| break; |
| default: |
| WARN_ON_ONCE(1); |
| return -EINVAL; |
| } |
| |
| return sysfs_emit(buf, "%u\n", width); |
| } |
| static DEVICE_ATTR(tx_lanes, 0444, tx_lanes_show, NULL); |
| |
| static ssize_t nvm_authenticate_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct tb_switch *sw = tb_to_switch(dev); |
| u32 status; |
| |
| nvm_get_auth_status(sw, &status); |
| return sysfs_emit(buf, "%#x\n", status); |
| } |
| |
| static ssize_t nvm_authenticate_sysfs(struct device *dev, const char *buf, |
| bool disconnect) |
| { |
| struct tb_switch *sw = tb_to_switch(dev); |
| int val, ret; |
| |
| pm_runtime_get_sync(&sw->dev); |
| |
| if (!mutex_trylock(&sw->tb->lock)) { |
| ret = restart_syscall(); |
| goto exit_rpm; |
| } |
| |
| if (sw->no_nvm_upgrade) { |
| ret = -EOPNOTSUPP; |
| goto exit_unlock; |
| } |
| |
| /* If NVMem devices are not yet added */ |
| if (!sw->nvm) { |
| ret = -EAGAIN; |
| goto exit_unlock; |
| } |
| |
| ret = kstrtoint(buf, 10, &val); |
| if (ret) |
| goto exit_unlock; |
| |
| /* Always clear the authentication status */ |
| nvm_clear_auth_status(sw); |
| |
| if (val > 0) { |
| if (val == AUTHENTICATE_ONLY) { |
| if (disconnect) |
| ret = -EINVAL; |
| else |
| ret = nvm_authenticate(sw, true); |
| } else { |
| if (!sw->nvm->flushed) { |
| if (!sw->nvm->buf) { |
| ret = -EINVAL; |
| goto exit_unlock; |
| } |
| |
| ret = nvm_validate_and_write(sw); |
| if (ret || val == WRITE_ONLY) |
| goto exit_unlock; |
| } |
| if (val == WRITE_AND_AUTHENTICATE) { |
| if (disconnect) |
| ret = tb_lc_force_power(sw); |
| else |
| ret = nvm_authenticate(sw, false); |
| } |
| } |
| } |
| |
| exit_unlock: |
| mutex_unlock(&sw->tb->lock); |
| exit_rpm: |
| pm_runtime_mark_last_busy(&sw->dev); |
| pm_runtime_put_autosuspend(&sw->dev); |
| |
| return ret; |
| } |
| |
| static ssize_t nvm_authenticate_store(struct device *dev, |
| struct device_attribute *attr, const char *buf, size_t count) |
| { |
| int ret = nvm_authenticate_sysfs(dev, buf, false); |
| if (ret) |
| return ret; |
| return count; |
| } |
| static DEVICE_ATTR_RW(nvm_authenticate); |
| |
| static ssize_t nvm_authenticate_on_disconnect_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| return nvm_authenticate_show(dev, attr, buf); |
| } |
| |
| static ssize_t nvm_authenticate_on_disconnect_store(struct device *dev, |
| struct device_attribute *attr, const char *buf, size_t count) |
| { |
| int ret; |
| |
| ret = nvm_authenticate_sysfs(dev, buf, true); |
| return ret ? ret : count; |
| } |
| static DEVICE_ATTR_RW(nvm_authenticate_on_disconnect); |
| |
| static ssize_t nvm_version_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct tb_switch *sw = tb_to_switch(dev); |
| int ret; |
| |
| if (!mutex_trylock(&sw->tb->lock)) |
| return restart_syscall(); |
| |
| if (sw->safe_mode) |
| ret = -ENODATA; |
| else if (!sw->nvm) |
| ret = -EAGAIN; |
| else |
| ret = sysfs_emit(buf, "%x.%x\n", sw->nvm->major, sw->nvm->minor); |
| |
| mutex_unlock(&sw->tb->lock); |
| |
| return ret; |
| } |
| static DEVICE_ATTR_RO(nvm_version); |
| |
| static ssize_t vendor_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct tb_switch *sw = tb_to_switch(dev); |
| |
| return sysfs_emit(buf, "%#x\n", sw->vendor); |
| } |
| static DEVICE_ATTR_RO(vendor); |
| |
| static ssize_t |
| vendor_name_show(struct device *dev, struct device_attribute *attr, char *buf) |
| { |
| struct tb_switch *sw = tb_to_switch(dev); |
| |
| return sysfs_emit(buf, "%s\n", sw->vendor_name ?: ""); |
| } |
| static DEVICE_ATTR_RO(vendor_name); |
| |
| static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct tb_switch *sw = tb_to_switch(dev); |
| |
| return sysfs_emit(buf, "%pUb\n", sw->uuid); |
| } |
| static DEVICE_ATTR_RO(unique_id); |
| |
| static struct attribute *switch_attrs[] = { |
| &dev_attr_authorized.attr, |
| &dev_attr_boot.attr, |
| &dev_attr_device.attr, |
| &dev_attr_device_name.attr, |
| &dev_attr_generation.attr, |
| &dev_attr_key.attr, |
| &dev_attr_nvm_authenticate.attr, |
| &dev_attr_nvm_authenticate_on_disconnect.attr, |
| &dev_attr_nvm_version.attr, |
| &dev_attr_rx_speed.attr, |
| &dev_attr_rx_lanes.attr, |
| &dev_attr_tx_speed.attr, |
| &dev_attr_tx_lanes.attr, |
| &dev_attr_vendor.attr, |
| &dev_attr_vendor_name.attr, |
| &dev_attr_unique_id.attr, |
| NULL, |
| }; |
| |
| static umode_t switch_attr_is_visible(struct kobject *kobj, |
| struct attribute *attr, int n) |
| { |
| struct device *dev = kobj_to_dev(kobj); |
| struct tb_switch *sw = tb_to_switch(dev); |
| |
| if (attr == &dev_attr_authorized.attr) { |
| if (sw->tb->security_level == TB_SECURITY_NOPCIE || |
| sw->tb->security_level == TB_SECURITY_DPONLY) |
| return 0; |
| } else if (attr == &dev_attr_device.attr) { |
| if (!sw->device) |
| return 0; |
| } else if (attr == &dev_attr_device_name.attr) { |
| if (!sw->device_name) |
| return 0; |
| } else if (attr == &dev_attr_vendor.attr) { |
| if (!sw->vendor) |
| return 0; |
| } else if (attr == &dev_attr_vendor_name.attr) { |
| if (!sw->vendor_name) |
| return 0; |
| } else if (attr == &dev_attr_key.attr) { |
| if (tb_route(sw) && |
| sw->tb->security_level == TB_SECURITY_SECURE && |
| sw->security_level == TB_SECURITY_SECURE) |
| return attr->mode; |
| return 0; |
| } else if (attr == &dev_attr_rx_speed.attr || |
| attr == &dev_attr_rx_lanes.attr || |
| attr == &dev_attr_tx_speed.attr || |
| attr == &dev_attr_tx_lanes.attr) { |
| if (tb_route(sw)) |
| return attr->mode; |
| return 0; |
| } else if (attr == &dev_attr_nvm_authenticate.attr) { |
| if (nvm_upgradeable(sw)) |
| return attr->mode; |
| return 0; |
| } else if (attr == &dev_attr_nvm_version.attr) { |
| if (nvm_readable(sw)) |
| return attr->mode; |
| return 0; |
| } else if (attr == &dev_attr_boot.attr) { |
| if (tb_route(sw)) |
| return attr->mode; |
| return 0; |
| } else if (attr == &dev_attr_nvm_authenticate_on_disconnect.attr) { |
| if (sw->quirks & QUIRK_FORCE_POWER_LINK_CONTROLLER) |
| return attr->mode; |
| return 0; |
| } |
| |
| return sw->safe_mode ? 0 : attr->mode; |
| } |
| |
| static const struct attribute_group switch_group = { |
| .is_visible = switch_attr_is_visible, |
| .attrs = switch_attrs, |
| }; |
| |
| static const struct attribute_group *switch_groups[] = { |
| &switch_group, |
| NULL, |
| }; |
| |
| static void tb_switch_release(struct device *dev) |
| { |
| struct tb_switch *sw = tb_to_switch(dev); |
| struct tb_port *port; |
| |
| dma_port_free(sw->dma_port); |
| |
| tb_switch_for_each_port(sw, port) { |
| ida_destroy(&port->in_hopids); |
| ida_destroy(&port->out_hopids); |
| } |
| |
| kfree(sw->uuid); |
| kfree(sw->device_name); |
| kfree(sw->vendor_name); |
| kfree(sw->ports); |
| kfree(sw->drom); |
| kfree(sw->key); |
| kfree(sw); |
| } |
| |
| static int tb_switch_uevent(const struct device *dev, struct kobj_uevent_env *env) |
| { |
| const struct tb_switch *sw = tb_to_switch(dev); |
| const char *type; |
| |
| if (tb_switch_is_usb4(sw)) { |
| if (add_uevent_var(env, "USB4_VERSION=%u.0", |
| usb4_switch_version(sw))) |
| return -ENOMEM; |
| } |
| |
| if (!tb_route(sw)) { |
| type = "host"; |
| } else { |
| const struct tb_port *port; |
| bool hub = false; |
| |
| /* Device is hub if it has any downstream ports */ |
| tb_switch_for_each_port(sw, port) { |
| if (!port->disabled && !tb_is_upstream_port(port) && |
| tb_port_is_null(port)) { |
| hub = true; |
| break; |
| } |
| } |
| |
| type = hub ? "hub" : "device"; |
| } |
| |
| if (add_uevent_var(env, "USB4_TYPE=%s", type)) |
| return -ENOMEM; |
| return 0; |
| } |
| |
| /* |
| * Currently only need to provide the callbacks. Everything else is handled |
| * in the connection manager. |
| */ |
| static int __maybe_unused tb_switch_runtime_suspend(struct device *dev) |
| { |
| struct tb_switch *sw = tb_to_switch(dev); |
| const struct tb_cm_ops *cm_ops = sw->tb->cm_ops; |
| |
| if (cm_ops->runtime_suspend_switch) |
| return cm_ops->runtime_suspend_switch(sw); |
| |
| return 0; |
| } |
| |
| static int __maybe_unused tb_switch_runtime_resume(struct device *dev) |
| { |
| struct tb_switch *sw = tb_to_switch(dev); |
| const struct tb_cm_ops *cm_ops = sw->tb->cm_ops; |
| |
| if (cm_ops->runtime_resume_switch) |
| return cm_ops->runtime_resume_switch(sw); |
| return 0; |
| } |
| |
| static const struct dev_pm_ops tb_switch_pm_ops = { |
| SET_RUNTIME_PM_OPS(tb_switch_runtime_suspend, tb_switch_runtime_resume, |
| NULL) |
| }; |
| |
| const struct device_type tb_switch_type = { |
| .name = "thunderbolt_device", |
| .release = tb_switch_release, |
| .uevent = tb_switch_uevent, |
| .pm = &tb_switch_pm_ops, |
| }; |
| |
| static int tb_switch_get_generation(struct tb_switch *sw) |
| { |
| if (tb_switch_is_usb4(sw)) |
| return 4; |
| |
| if (sw->config.vendor_id == PCI_VENDOR_ID_INTEL) { |
| switch (sw->config.device_id) { |
| case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE: |
| case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE: |
| case PCI_DEVICE_ID_INTEL_LIGHT_PEAK: |
| case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_2C: |
| case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C: |
| case PCI_DEVICE_ID_INTEL_PORT_RIDGE: |
| case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_2C_BRIDGE: |
| case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_4C_BRIDGE: |
| return 1; |
| |
| case PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_BRIDGE: |
| case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE: |
| case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE: |
| return 2; |
| |
| case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE: |
| case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_BRIDGE: |
| case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_BRIDGE: |
| case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE: |
| case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE: |
| case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_BRIDGE: |
| case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_BRIDGE: |
| case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_BRIDGE: |
| case PCI_DEVICE_ID_INTEL_ICL_NHI0: |
| case PCI_DEVICE_ID_INTEL_ICL_NHI1: |
| return 3; |
| } |
| } |
| |
| /* |
| * For unknown switches assume generation to be 1 to be on the |
| * safe side. |
| */ |
| tb_sw_warn(sw, "unsupported switch device id %#x\n", |
| sw->config.device_id); |
| return 1; |
| } |
| |
| static bool tb_switch_exceeds_max_depth(const struct tb_switch *sw, int depth) |
| { |
| int max_depth; |
| |
| if (tb_switch_is_usb4(sw) || |
| (sw->tb->root_switch && tb_switch_is_usb4(sw->tb->root_switch))) |
| max_depth = USB4_SWITCH_MAX_DEPTH; |
| else |
| max_depth = TB_SWITCH_MAX_DEPTH; |
| |
| return depth > max_depth; |
| } |
| |
| /** |
| * tb_switch_alloc() - allocate a switch |
| * @tb: Pointer to the owning domain |
| * @parent: Parent device for this switch |
| * @route: Route string for this switch |
| * |
| * Allocates and initializes a switch. Will not upload configuration to |
| * the switch. For that you need to call tb_switch_configure() |
| * separately. The returned switch should be released by calling |
| * tb_switch_put(). |
| * |
| * Return: Pointer to the allocated switch or ERR_PTR() in case of |
| * failure. |
| */ |
| struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent, |
| u64 route) |
| { |
| struct tb_switch *sw; |
| int upstream_port; |
| int i, ret, depth; |
| |
| /* Unlock the downstream port so we can access the switch below */ |
| if (route) { |
| struct tb_switch *parent_sw = tb_to_switch(parent); |
| struct tb_port *down; |
| |
| down = tb_port_at(route, parent_sw); |
| tb_port_unlock(down); |
| } |
| |
| depth = tb_route_length(route); |
| |
| upstream_port = tb_cfg_get_upstream_port(tb->ctl, route); |
| if (upstream_port < 0) |
| return ERR_PTR(upstream_port); |
| |
| sw = kzalloc(sizeof(*sw), GFP_KERNEL); |
| if (!sw) |
| return ERR_PTR(-ENOMEM); |
| |
| sw->tb = tb; |
| ret = tb_cfg_read(tb->ctl, &sw->config, route, 0, TB_CFG_SWITCH, 0, 5); |
| if (ret) |
| goto err_free_sw_ports; |
| |
| sw->generation = tb_switch_get_generation(sw); |
| |
| tb_dbg(tb, "current switch config:\n"); |
| tb_dump_switch(tb, sw); |
| |
| /* configure switch */ |
| sw->config.upstream_port_number = upstream_port; |
| sw->config.depth = depth; |
| sw->config.route_hi = upper_32_bits(route); |
| sw->config.route_lo = lower_32_bits(route); |
| sw->config.enabled = 0; |
| |
| /* Make sure we do not exceed maximum topology limit */ |
| if (tb_switch_exceeds_max_depth(sw, depth)) { |
| ret = -EADDRNOTAVAIL; |
| goto err_free_sw_ports; |
| } |
| |
| /* initialize ports */ |
| sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports), |
| GFP_KERNEL); |
| if (!sw->ports) { |
| ret = -ENOMEM; |
| goto err_free_sw_ports; |
| } |
| |
| for (i = 0; i <= sw->config.max_port_number; i++) { |
| /* minimum setup for tb_find_cap and tb_drom_read to work */ |
| sw->ports[i].sw = sw; |
| sw->ports[i].port = i; |
| |
| /* Control port does not need HopID allocation */ |
| if (i) { |
| ida_init(&sw->ports[i].in_hopids); |
| ida_init(&sw->ports[i].out_hopids); |
| } |
| } |
| |
| ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_PLUG_EVENTS); |
| if (ret > 0) |
| sw->cap_plug_events = ret; |
| |
| ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_TIME2); |
| if (ret > 0) |
| sw->cap_vsec_tmu = ret; |
| |
| ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_LINK_CONTROLLER); |
| if (ret > 0) |
| sw->cap_lc = ret; |
| |
| ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_CP_LP); |
| if (ret > 0) |
| sw->cap_lp = ret; |
| |
| /* Root switch is always authorized */ |
| if (!route) |
| sw->authorized = true; |
| |
| device_initialize(&sw->dev); |
| sw->dev.parent = parent; |
| sw->dev.bus = &tb_bus_type; |
| sw->dev.type = &tb_switch_type; |
| sw->dev.groups = switch_groups; |
| dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw)); |
| |
| return sw; |
| |
| err_free_sw_ports: |
| kfree(sw->ports); |
| kfree(sw); |
| |
| return ERR_PTR(ret); |
| } |
| |
| /** |
| * tb_switch_alloc_safe_mode() - allocate a switch that is in safe mode |
| * @tb: Pointer to the owning domain |
| * @parent: Parent device for this switch |
| * @route: Route string for this switch |
| * |
| * This creates a switch in safe mode. This means the switch pretty much |
| * lacks all capabilities except DMA configuration port before it is |
| * flashed with a valid NVM firmware. |
| * |
| * The returned switch must be released by calling tb_switch_put(). |
| * |
| * Return: Pointer to the allocated switch or ERR_PTR() in case of failure |
| */ |
| struct tb_switch * |
| tb_switch_alloc_safe_mode(struct tb *tb, struct device *parent, u64 route) |
| { |
| struct tb_switch *sw; |
| |
| sw = kzalloc(sizeof(*sw), GFP_KERNEL); |
| if (!sw) |
| return ERR_PTR(-ENOMEM); |
| |
| sw->tb = tb; |
| sw->config.depth = tb_route_length(route); |
| sw->config.route_hi = upper_32_bits(route); |
| sw->config.route_lo = lower_32_bits(route); |
| sw->safe_mode = true; |
| |
| device_initialize(&sw->dev); |
| sw->dev.parent = parent; |
| sw->dev.bus = &tb_bus_type; |
| sw->dev.type = &tb_switch_type; |
| sw->dev.groups = switch_groups; |
| dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw)); |
| |
| return sw; |
| } |
| |
| /** |
| * tb_switch_configure() - Uploads configuration to the switch |
| * @sw: Switch to configure |
| * |
| * Call this function before the switch is added to the system. It will |
| * upload configuration to the switch and makes it available for the |
| * connection manager to use. Can be called to the switch again after |
| * resume from low power states to re-initialize it. |
| * |
| * Return: %0 in case of success and negative errno in case of failure |
| */ |
| int tb_switch_configure(struct tb_switch *sw) |
| { |
| struct tb *tb = sw->tb; |
| u64 route; |
| int ret; |
| |
| route = tb_route(sw); |
| |
| tb_dbg(tb, "%s Switch at %#llx (depth: %d, up port: %d)\n", |
| sw->config.enabled ? "restoring" : "initializing", route, |
| tb_route_length(route), sw->config.upstream_port_number); |
| |
| sw->config.enabled = 1; |
| |
| if (tb_switch_is_usb4(sw)) { |
| /* |
| * For USB4 devices, we need to program the CM version |
| * accordingly so that it knows to expose all the |
| * additional capabilities. Program it according to USB4 |
| * version to avoid changing existing (v1) routers behaviour. |
| */ |
| if (usb4_switch_version(sw) < 2) |
| sw->config.cmuv = ROUTER_CS_4_CMUV_V1; |
| else |
| sw->config.cmuv = ROUTER_CS_4_CMUV_V2; |
| sw->config.plug_events_delay = 0xa; |
| |
| /* Enumerate the switch */ |
| ret = tb_sw_write(sw, (u32 *)&sw->config + 1, TB_CFG_SWITCH, |
| ROUTER_CS_1, 4); |
| if (ret) |
| return ret; |
| |
| ret = usb4_switch_setup(sw); |
| } else { |
| if (sw->config.vendor_id != PCI_VENDOR_ID_INTEL) |
| tb_sw_warn(sw, "unknown switch vendor id %#x\n", |
| sw->config.vendor_id); |
| |
| if (!sw->cap_plug_events) { |
| tb_sw_warn(sw, "cannot find TB_VSE_CAP_PLUG_EVENTS aborting\n"); |
| return -ENODEV; |
| } |
| |
| /* Enumerate the switch */ |
| ret = tb_sw_write(sw, (u32 *)&sw->config + 1, TB_CFG_SWITCH, |
| ROUTER_CS_1, 3); |
| } |
| if (ret) |
| return ret; |
| |
| return tb_plug_events_active(sw, true); |
| } |
| |
| /** |
| * tb_switch_configuration_valid() - Set the tunneling configuration to be valid |
| * @sw: Router to configure |
| * |
| * Needs to be called before any tunnels can be setup through the |
| * router. Can be called to any router. |
| * |
| * Returns %0 in success and negative errno otherwise. |
| */ |
| int tb_switch_configuration_valid(struct tb_switch *sw) |
| { |
| if (tb_switch_is_usb4(sw)) |
| return usb4_switch_configuration_valid(sw); |
| return 0; |
| } |
| |
| static int tb_switch_set_uuid(struct tb_switch *sw) |
| { |
| bool uid = false; |
| u32 uuid[4]; |
| int ret; |
| |
| if (sw->uuid) |
| return 0; |
| |
| if (tb_switch_is_usb4(sw)) { |
| ret = usb4_switch_read_uid(sw, &sw->uid); |
| if (ret) |
| return ret; |
| uid = true; |
| } else { |
| /* |
| * The newer controllers include fused UUID as part of |
| * link controller specific registers |
| */ |
| ret = tb_lc_read_uuid(sw, uuid); |
| if (ret) { |
| if (ret != -EINVAL) |
| return ret; |
| uid = true; |
| } |
| } |
| |
| if (uid) { |
| /* |
| * ICM generates UUID based on UID and fills the upper |
| * two words with ones. This is not strictly following |
| * UUID format but we want to be compatible with it so |
| * we do the same here. |
| */ |
| uuid[0] = sw->uid & 0xffffffff; |
| uuid[1] = (sw->uid >> 32) & 0xffffffff; |
| uuid[2] = 0xffffffff; |
| uuid[3] = 0xffffffff; |
| } |
| |
| sw->uuid = kmemdup(uuid, sizeof(uuid), GFP_KERNEL); |
| if (!sw->uuid) |
| return -ENOMEM; |
| return 0; |
| } |
| |
| static int tb_switch_add_dma_port(struct tb_switch *sw) |
| { |
| u32 status; |
| int ret; |
| |
| switch (sw->generation) { |
| case 2: |
| /* Only root switch can be upgraded */ |
| if (tb_route(sw)) |
| return 0; |
| |
| fallthrough; |
| case 3: |
| case 4: |
| ret = tb_switch_set_uuid(sw); |
| if (ret) |
| return ret; |
| break; |
| |
| default: |
| /* |
| * DMA port is the only thing available when the switch |
| * is in safe mode. |
| */ |
| if (!sw->safe_mode) |
| return 0; |
| break; |
| } |
| |
| if (sw->no_nvm_upgrade) |
| return 0; |
| |
| if (tb_switch_is_usb4(sw)) { |
| ret = usb4_switch_nvm_authenticate_status(sw, &status); |
| if (ret) |
| return ret; |
| |
| if (status) { |
| tb_sw_info(sw, "switch flash authentication failed\n"); |
| nvm_set_auth_status(sw, status); |
| } |
| |
| return 0; |
| } |
| |
| /* Root switch DMA port requires running firmware */ |
| if (!tb_route(sw) && !tb_switch_is_icm(sw)) |
| return 0; |
| |
| sw->dma_port = dma_port_alloc(sw); |
| if (!sw->dma_port) |
| return 0; |
| |
| /* |
| * If there is status already set then authentication failed |
| * when the dma_port_flash_update_auth() returned. Power cycling |
| * is not needed (it was done already) so only thing we do here |
| * is to unblock runtime PM of the root port. |
| */ |
| nvm_get_auth_status(sw, &status); |
| if (status) { |
| if (!tb_route(sw)) |
| nvm_authenticate_complete_dma_port(sw); |
| return 0; |
| } |
| |
| /* |
| * Check status of the previous flash authentication. If there |
| * is one we need to power cycle the switch in any case to make |
| * it functional again. |
| */ |
| ret = dma_port_flash_update_auth_status(sw->dma_port, &status); |
| if (ret <= 0) |
| return ret; |
| |
| /* Now we can allow root port to suspend again */ |
| if (!tb_route(sw)) |
| nvm_authenticate_complete_dma_port(sw); |
| |
| if (status) { |
| tb_sw_info(sw, "switch flash authentication failed\n"); |
| nvm_set_auth_status(sw, status); |
| } |
| |
| tb_sw_info(sw, "power cycling the switch now\n"); |
| dma_port_power_cycle(sw->dma_port); |
| |
| /* |
| * We return error here which causes the switch adding failure. |
| * It should appear back after power cycle is complete. |
| */ |
| return -ESHUTDOWN; |
| } |
| |
| static void tb_switch_default_link_ports(struct tb_switch *sw) |
| { |
| int i; |
| |
| for (i = 1; i <= sw->config.max_port_number; i++) { |
| struct tb_port *port = &sw->ports[i]; |
| struct tb_port *subordinate; |
| |
| if (!tb_port_is_null(port)) |
| continue; |
| |
| /* Check for the subordinate port */ |
| if (i == sw->config.max_port_number || |
| !tb_port_is_null(&sw->ports[i + 1])) |
| continue; |
| |
| /* Link them if not already done so (by DROM) */ |
| subordinate = &sw->ports[i + 1]; |
| if (!port->dual_link_port && !subordinate->dual_link_port) { |
| port->link_nr = 0; |
| port->dual_link_port = subordinate; |
| subordinate->link_nr = 1; |
| subordinate->dual_link_port = port; |
| |
| tb_sw_dbg(sw, "linked ports %d <-> %d\n", |
| port->port, subordinate->port); |
| } |
| } |
| } |
| |
| static bool tb_switch_lane_bonding_possible(struct tb_switch *sw) |
| { |
| const struct tb_port *up = tb_upstream_port(sw); |
| |
| if (!up->dual_link_port || !up->dual_link_port->remote) |
| return false; |
| |
| if (tb_switch_is_usb4(sw)) |
| return usb4_switch_lane_bonding_possible(sw); |
| return tb_lc_lane_bonding_possible(sw); |
| } |
| |
| static int tb_switch_update_link_attributes(struct tb_switch *sw) |
| { |
| struct tb_port *up; |
| bool change = false; |
| int ret; |
| |
| if (!tb_route(sw) || tb_switch_is_icm(sw)) |
| return 0; |
| |
| up = tb_upstream_port(sw); |
| |
| ret = tb_port_get_link_speed(up); |
| if (ret < 0) |
| return ret; |
| if (sw->link_speed != ret) |
| change = true; |
| sw->link_speed = ret; |
| |
| ret = tb_port_get_link_width(up); |
| if (ret < 0) |
| return ret; |
| if (sw->link_width != ret) |
| change = true; |
| sw->link_width = ret; |
| |
| /* Notify userspace that there is possible link attribute change */ |
| if (device_is_registered(&sw->dev) && change) |
| kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE); |
| |
| return 0; |
| } |
| |
| /* Must be called after tb_switch_update_link_attributes() */ |
| static void tb_switch_link_init(struct tb_switch *sw) |
| { |
| struct tb_port *up, *down; |
| bool bonded; |
| |
| if (!tb_route(sw) || tb_switch_is_icm(sw)) |
| return; |
| |
| tb_sw_dbg(sw, "current link speed %u.0 Gb/s\n", sw->link_speed); |
| tb_sw_dbg(sw, "current link width %s\n", tb_width_name(sw->link_width)); |
| |
| bonded = sw->link_width >= TB_LINK_WIDTH_DUAL; |
| |
| /* |
| * Gen 4 links come up as bonded so update the port structures |
| * accordingly. |
| */ |
| up = tb_upstream_port(sw); |
| down = tb_switch_downstream_port(sw); |
| |
| up->bonded = bonded; |
| if (up->dual_link_port) |
| up->dual_link_port->bonded = bonded; |
| tb_port_update_credits(up); |
| |
| down->bonded = bonded; |
| if (down->dual_link_port) |
| down->dual_link_port->bonded = bonded; |
| tb_port_update_credits(down); |
| |
| if (tb_port_get_link_generation(up) < 4) |
| return; |
| |
| /* |
| * Set the Gen 4 preferred link width. This is what the router |
| * prefers when the link is brought up. If the router does not |
| * support asymmetric link configuration, this also will be set |
| * to TB_LINK_WIDTH_DUAL. |
| */ |
| sw->preferred_link_width = sw->link_width; |
| tb_sw_dbg(sw, "preferred link width %s\n", |
| tb_width_name(sw->preferred_link_width)); |
| } |
| |
| /** |
| * tb_switch_lane_bonding_enable() - Enable lane bonding |
| * @sw: Switch to enable lane bonding |
| * |
| * Connection manager can call this function to enable lane bonding of a |
| * switch. If conditions are correct and both switches support the feature, |
| * lanes are bonded. It is safe to call this to any switch. |
| */ |
| static int tb_switch_lane_bonding_enable(struct tb_switch *sw) |
| { |
| struct tb_port *up, *down; |
| unsigned int width; |
| int ret; |
| |
| if (!tb_switch_lane_bonding_possible(sw)) |
| return 0; |
| |
| up = tb_upstream_port(sw); |
| down = tb_switch_downstream_port(sw); |
| |
| if (!tb_port_width_supported(up, TB_LINK_WIDTH_DUAL) || |
| !tb_port_width_supported(down, TB_LINK_WIDTH_DUAL)) |
| return 0; |
| |
| /* |
| * Both lanes need to be in CL0. Here we assume lane 0 already be in |
| * CL0 and check just for lane 1. |
| */ |
| if (tb_wait_for_port(down->dual_link_port, false) <= 0) |
| return -ENOTCONN; |
| |
| ret = tb_port_lane_bonding_enable(up); |
| if (ret) { |
| tb_port_warn(up, "failed to enable lane bonding\n"); |
| return ret; |
| } |
| |
| ret = tb_port_lane_bonding_enable(down); |
| if (ret) { |
| tb_port_warn(down, "failed to enable lane bonding\n"); |
| tb_port_lane_bonding_disable(up); |
| return ret; |
| } |
| |
| /* Any of the widths are all bonded */ |
| width = TB_LINK_WIDTH_DUAL | TB_LINK_WIDTH_ASYM_TX | |
| TB_LINK_WIDTH_ASYM_RX; |
| |
| return tb_port_wait_for_link_width(down, width, 100); |
| } |
| |
| /** |
| * tb_switch_lane_bonding_disable() - Disable lane bonding |
| * @sw: Switch whose lane bonding to disable |
| * |
| * Disables lane bonding between @sw and parent. This can be called even |
| * if lanes were not bonded originally. |
| */ |
| static int tb_switch_lane_bonding_disable(struct tb_switch *sw) |
| { |
| struct tb_port *up, *down; |
| int ret; |
| |
| up = tb_upstream_port(sw); |
| if (!up->bonded) |
| return 0; |
| |
| /* |
| * If the link is Gen 4 there is no way to switch the link to |
| * two single lane links so avoid that here. Also don't bother |
| * if the link is not up anymore (sw is unplugged). |
| */ |
| ret = tb_port_get_link_generation(up); |
| if (ret < 0) |
| return ret; |
| if (ret >= 4) |
| return -EOPNOTSUPP; |
| |
| down = tb_switch_downstream_port(sw); |
| tb_port_lane_bonding_disable(up); |
| tb_port_lane_bonding_disable(down); |
| |
| /* |
| * It is fine if we get other errors as the router might have |
| * been unplugged. |
| */ |
| return tb_port_wait_for_link_width(down, TB_LINK_WIDTH_SINGLE, 100); |
| } |
| |
| /* Note updating sw->link_width done in tb_switch_update_link_attributes() */ |
| static int tb_switch_asym_enable(struct tb_switch *sw, enum tb_link_width width) |
| { |
| struct tb_port *up, *down, *port; |
| enum tb_link_width down_width; |
| int ret; |
| |
| up = tb_upstream_port(sw); |
| down = tb_switch_downstream_port(sw); |
| |
| if (width == TB_LINK_WIDTH_ASYM_TX) { |
| down_width = TB_LINK_WIDTH_ASYM_RX; |
| port = down; |
| } else { |
| down_width = TB_LINK_WIDTH_ASYM_TX; |
| port = up; |
| } |
| |
| ret = tb_port_set_link_width(up, width); |
| if (ret) |
| return ret; |
| |
| ret = tb_port_set_link_width(down, down_width); |
| if (ret) |
| return ret; |
| |
| /* |
| * Initiate the change in the router that one of its TX lanes is |
| * changing to RX but do so only if there is an actual change. |
| */ |
| if (sw->link_width != width) { |
| ret = usb4_port_asym_start(port); |
| if (ret) |
| return ret; |
| |
| ret = tb_port_wait_for_link_width(up, width, 100); |
| if (ret) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| /* Note updating sw->link_width done in tb_switch_update_link_attributes() */ |
| static int tb_switch_asym_disable(struct tb_switch *sw) |
| { |
| struct tb_port *up, *down; |
| int ret; |
| |
| up = tb_upstream_port(sw); |
| down = tb_switch_downstream_port(sw); |
| |
| ret = tb_port_set_link_width(up, TB_LINK_WIDTH_DUAL); |
| if (ret) |
| return ret; |
| |
| ret = tb_port_set_link_width(down, TB_LINK_WIDTH_DUAL); |
| if (ret) |
| return ret; |
| |
| /* |
| * Initiate the change in the router that has three TX lanes and |
| * is changing one of its TX lanes to RX but only if there is a |
| * change in the link width. |
| */ |
| if (sw->link_width > TB_LINK_WIDTH_DUAL) { |
| if (sw->link_width == TB_LINK_WIDTH_ASYM_TX) |
| ret = usb4_port_asym_start(up); |
| else |
| ret = usb4_port_asym_start(down); |
| if (ret) |
| return ret; |
| |
| ret = tb_port_wait_for_link_width(up, TB_LINK_WIDTH_DUAL, 100); |
| if (ret) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * tb_switch_set_link_width() - Configure router link width |
| * @sw: Router to configure |
| * @width: The new link width |
| * |
| * Set device router link width to @width from router upstream port |
| * perspective. Supports also asymmetric links if the routers boths side |
| * of the link supports it. |
| * |
| * Does nothing for host router. |
| * |
| * Returns %0 in case of success, negative errno otherwise. |
| */ |
| int tb_switch_set_link_width(struct tb_switch *sw, enum tb_link_width width) |
| { |
| struct tb_port *up, *down; |
| int ret = 0; |
| |
| if (!tb_route(sw)) |
| return 0; |
| |
| up = tb_upstream_port(sw); |
| down = tb_switch_downstream_port(sw); |
| |
| switch (width) { |
| case TB_LINK_WIDTH_SINGLE: |
| ret = tb_switch_lane_bonding_disable(sw); |
| break; |
| |
| case TB_LINK_WIDTH_DUAL: |
| if (sw->link_width == TB_LINK_WIDTH_ASYM_TX || |
| sw->link_width == TB_LINK_WIDTH_ASYM_RX) { |
| ret = tb_switch_asym_disable(sw); |
| if (ret) |
| break; |
| } |
| ret = tb_switch_lane_bonding_enable(sw); |
| break; |
| |
| case TB_LINK_WIDTH_ASYM_TX: |
| case TB_LINK_WIDTH_ASYM_RX: |
| ret = tb_switch_asym_enable(sw, width); |
| break; |
| } |
| |
| switch (ret) { |
| case 0: |
| break; |
| |
| case -ETIMEDOUT: |
| tb_sw_warn(sw, "timeout changing link width\n"); |
| return ret; |
| |
| case -ENOTCONN: |
| case -EOPNOTSUPP: |
| case -ENODEV: |
| return ret; |
| |
| default: |
| tb_sw_dbg(sw, "failed to change link width: %d\n", ret); |
| return ret; |
| } |
| |
| tb_port_update_credits(down); |
| tb_port_update_credits(up); |
| |
| tb_switch_update_link_attributes(sw); |
| |
| tb_sw_dbg(sw, "link width set to %s\n", tb_width_name(width)); |
| return ret; |
| } |
| |
| /** |
| * tb_switch_configure_link() - Set link configured |
| * @sw: Switch whose link is configured |
| * |
| * Sets the link upstream from @sw configured (from both ends) so that |
| * it will not be disconnected when the domain exits sleep. Can be |
| * called for any switch. |
| * |
| * It is recommended that this is called after lane bonding is enabled. |
| * |
| * Returns %0 on success and negative errno in case of error. |
| */ |
| int tb_switch_configure_link(struct tb_switch *sw) |
| { |
| struct tb_port *up, *down; |
| int ret; |
| |
| if (!tb_route(sw) || tb_switch_is_icm(sw)) |
| return 0; |
| |
| up = tb_upstream_port(sw); |
| if (tb_switch_is_usb4(up->sw)) |
| ret = usb4_port_configure(up); |
| else |
| ret = tb_lc_configure_port(up); |
| if (ret) |
| return ret; |
| |
| down = up->remote; |
| if (tb_switch_is_usb4(down->sw)) |
| return usb4_port_configure(down); |
| return tb_lc_configure_port(down); |
| } |
| |
| /** |
| * tb_switch_unconfigure_link() - Unconfigure link |
| * @sw: Switch whose link is unconfigured |
| * |
| * Sets the link unconfigured so the @sw will be disconnected if the |
| * domain exists sleep. |
| */ |
| void tb_switch_unconfigure_link(struct tb_switch *sw) |
| { |
| struct tb_port *up, *down; |
| |
| if (!tb_route(sw) || tb_switch_is_icm(sw)) |
| return; |
| |
| /* |
| * Unconfigure downstream port so that wake-on-connect can be |
| * configured after router unplug. No need to unconfigure upstream port |
| * since its router is unplugged. |
| */ |
| up = tb_upstream_port(sw); |
| down = up->remote; |
| if (tb_switch_is_usb4(down->sw)) |
| usb4_port_unconfigure(down); |
| else |
| tb_lc_unconfigure_port(down); |
| |
| if (sw->is_unplugged) |
| return; |
| |
| up = tb_upstream_port(sw); |
| if (tb_switch_is_usb4(up->sw)) |
| usb4_port_unconfigure(up); |
| else |
| tb_lc_unconfigure_port(up); |
| } |
| |
| static void tb_switch_credits_init(struct tb_switch *sw) |
| { |
| if (tb_switch_is_icm(sw)) |
| return; |
| if (!tb_switch_is_usb4(sw)) |
| return; |
| if (usb4_switch_credits_init(sw)) |
| tb_sw_info(sw, "failed to determine preferred buffer allocation, using defaults\n"); |
| } |
| |
| static int tb_switch_port_hotplug_enable(struct tb_switch *sw) |
| { |
| struct tb_port *port; |
| |
| if (tb_switch_is_icm(sw)) |
| return 0; |
| |
| tb_switch_for_each_port(sw, port) { |
| int res; |
| |
| if (!port->cap_usb4) |
| continue; |
| |
| res = usb4_port_hotplug_enable(port); |
| if (res) |
| return res; |
| } |
| return 0; |
| } |
| |
| /** |
| * tb_switch_add() - Add a switch to the domain |
| * @sw: Switch to add |
| * |
| * This is the last step in adding switch to the domain. It will read |
| * identification information from DROM and initializes ports so that |
| * they can be used to connect other switches. The switch will be |
| * exposed to the userspace when this function successfully returns. To |
| * remove and release the switch, call tb_switch_remove(). |
| * |
| * Return: %0 in case of success and negative errno in case of failure |
| */ |
| int tb_switch_add(struct tb_switch *sw) |
| { |
| int i, ret; |
| |
|
|