| // 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/nvmem-provider.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/sizes.h> |
| #include <linux/slab.h> |
| #include <linux/vmalloc.h> |
| |
| #include "tb.h" |
| |
| /* Switch authorization from userspace is serialized by this lock */ |
| static DEFINE_MUTEX(switch_lock); |
| |
| /* Switch NVM support */ |
| |
| #define NVM_DEVID 0x05 |
| #define NVM_VERSION 0x08 |
| #define NVM_CSS 0x10 |
| #define NVM_FLASH_SIZE 0x45 |
| |
| #define NVM_MIN_SIZE SZ_32K |
| #define NVM_MAX_SIZE SZ_512K |
| |
| static DEFINE_IDA(nvm_ida); |
| |
| 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, hdr_size; |
| const u8 *buf = sw->nvm->buf; |
| u16 ds_size; |
| int ret; |
| |
| if (!buf) |
| return -EINVAL; |
| |
| image_size = sw->nvm->buf_data_size; |
| if (image_size < NVM_MIN_SIZE || image_size > NVM_MAX_SIZE) |
| return -EINVAL; |
| |
| /* |
| * FARB pointer must point inside the image and must at least |
| * contain parts of the digital section we will be reading here. |
| */ |
| hdr_size = (*(u32 *)buf) & 0xffffff; |
| if (hdr_size + NVM_DEVID + 2 >= image_size) |
| return -EINVAL; |
| |
| /* Digital section start should be aligned to 4k page */ |
| if (!IS_ALIGNED(hdr_size, SZ_4K)) |
| return -EINVAL; |
| |
| /* |
| * Read digital section size and check that it also fits inside |
| * the image. |
| */ |
| ds_size = *(u16 *)(buf + hdr_size); |
| if (ds_size >= image_size) |
| return -EINVAL; |
| |
| if (!sw->safe_mode) { |
| u16 device_id; |
| |
| /* |
| * Make sure the device ID in the image matches the one |
| * we read from the switch config space. |
| */ |
| device_id = *(u16 *)(buf + hdr_size + NVM_DEVID); |
| if (device_id != sw->config.device_id) |
| return -EINVAL; |
| |
| if (sw->generation < 3) { |
| /* Write CSS headers first */ |
| ret = dma_port_flash_write(sw->dma_port, |
| DMA_PORT_CSS_ADDRESS, buf + NVM_CSS, |
| DMA_PORT_CSS_MAX_SIZE); |
| if (ret) |
| return ret; |
| } |
| |
| /* Skip headers in the image */ |
| buf += hdr_size; |
| image_size -= hdr_size; |
| } |
| |
| return dma_port_flash_write(sw->dma_port, 0, buf, image_size); |
| } |
| |
| static int nvm_authenticate_host(struct tb_switch *sw) |
| { |
| int ret; |
| |
| /* |
| * 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) { |
| 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); |
| return ret == -ETIMEDOUT ? 0 : ret; |
| } |
| |
| /* |
| * From safe mode we can get out by just power cycling the |
| * switch. |
| */ |
| dma_port_power_cycle(sw->dma_port); |
| return 0; |
| } |
| |
| static int nvm_authenticate_device(struct tb_switch *sw) |
| { |
| int ret, retries = 10; |
| |
| ret = dma_port_flash_update_auth(sw->dma_port); |
| if (ret && ret != -ETIMEDOUT) |
| 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 int tb_switch_nvm_read(void *priv, unsigned int offset, void *val, |
| size_t bytes) |
| { |
| struct tb_switch *sw = priv; |
| int ret; |
| |
| pm_runtime_get_sync(&sw->dev); |
| ret = dma_port_flash_read(sw->dma_port, offset, val, bytes); |
| pm_runtime_mark_last_busy(&sw->dev); |
| pm_runtime_put_autosuspend(&sw->dev); |
| |
| return ret; |
| } |
| |
| static int tb_switch_nvm_write(void *priv, unsigned int offset, void *val, |
| size_t bytes) |
| { |
| struct tb_switch *sw = priv; |
| int ret = 0; |
| |
| if (mutex_lock_interruptible(&switch_lock)) |
| return -ERESTARTSYS; |
| |
| /* |
| * 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. |
| */ |
| if (!sw->nvm->buf) { |
| sw->nvm->buf = vmalloc(NVM_MAX_SIZE); |
| if (!sw->nvm->buf) { |
| ret = -ENOMEM; |
| goto unlock; |
| } |
| } |
| |
| sw->nvm->buf_data_size = offset + bytes; |
| memcpy(sw->nvm->buf + offset, val, bytes); |
| |
| unlock: |
| mutex_unlock(&switch_lock); |
| |
| return ret; |
| } |
| |
| static struct nvmem_device *register_nvmem(struct tb_switch *sw, int id, |
| size_t size, bool active) |
| { |
| struct nvmem_config config; |
| |
| memset(&config, 0, sizeof(config)); |
| |
| if (active) { |
| config.name = "nvm_active"; |
| config.reg_read = tb_switch_nvm_read; |
| config.read_only = true; |
| } else { |
| config.name = "nvm_non_active"; |
| config.reg_write = tb_switch_nvm_write; |
| config.root_only = true; |
| } |
| |
| config.id = id; |
| config.stride = 4; |
| config.word_size = 4; |
| config.size = size; |
| config.dev = &sw->dev; |
| config.owner = THIS_MODULE; |
| config.priv = sw; |
| |
| return nvmem_register(&config); |
| } |
| |
| static int tb_switch_nvm_add(struct tb_switch *sw) |
| { |
| struct nvmem_device *nvm_dev; |
| struct tb_switch_nvm *nvm; |
| u32 val; |
| int ret; |
| |
| if (!sw->dma_port) |
| return 0; |
| |
| nvm = kzalloc(sizeof(*nvm), GFP_KERNEL); |
| if (!nvm) |
| return -ENOMEM; |
| |
| nvm->id = ida_simple_get(&nvm_ida, 0, 0, GFP_KERNEL); |
| |
| /* |
| * 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) { |
| u32 nvm_size, hdr_size; |
| |
| ret = dma_port_flash_read(sw->dma_port, NVM_FLASH_SIZE, &val, |
| sizeof(val)); |
| if (ret) |
| goto err_ida; |
| |
| hdr_size = sw->generation < 3 ? SZ_8K : SZ_16K; |
| nvm_size = (SZ_1M << (val & 7)) / 8; |
| nvm_size = (nvm_size - hdr_size) / 2; |
| |
| ret = dma_port_flash_read(sw->dma_port, NVM_VERSION, &val, |
| sizeof(val)); |
| if (ret) |
| goto err_ida; |
| |
| nvm->major = val >> 16; |
| nvm->minor = val >> 8; |
| |
| nvm_dev = register_nvmem(sw, nvm->id, nvm_size, true); |
| if (IS_ERR(nvm_dev)) { |
| ret = PTR_ERR(nvm_dev); |
| goto err_ida; |
| } |
| nvm->active = nvm_dev; |
| } |
| |
| nvm_dev = register_nvmem(sw, nvm->id, NVM_MAX_SIZE, false); |
| if (IS_ERR(nvm_dev)) { |
| ret = PTR_ERR(nvm_dev); |
| goto err_nvm_active; |
| } |
| nvm->non_active = nvm_dev; |
| |
| mutex_lock(&switch_lock); |
| sw->nvm = nvm; |
| mutex_unlock(&switch_lock); |
| |
| return 0; |
| |
| err_nvm_active: |
| if (nvm->active) |
| nvmem_unregister(nvm->active); |
| err_ida: |
| ida_simple_remove(&nvm_ida, nvm->id); |
| kfree(nvm); |
| |
| return ret; |
| } |
| |
| static void tb_switch_nvm_remove(struct tb_switch *sw) |
| { |
| struct tb_switch_nvm *nvm; |
| |
| mutex_lock(&switch_lock); |
| nvm = sw->nvm; |
| sw->nvm = NULL; |
| mutex_unlock(&switch_lock); |
| |
| if (!nvm) |
| return; |
| |
| /* Remove authentication status in case the switch is unplugged */ |
| if (!nvm->authenticating) |
| nvm_clear_auth_status(sw); |
| |
| nvmem_unregister(nvm->non_active); |
| if (nvm->active) |
| nvmem_unregister(nvm->active); |
| ida_simple_remove(&nvm_ida, nvm->id); |
| vfree(nvm->buf); |
| kfree(nvm); |
| } |
| |
| /* port utility functions */ |
| |
| static const char *tb_port_type(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, struct tb_regs_port_header *port) |
| { |
| tb_dbg(tb, |
| " Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n", |
| port->port_number, port->vendor_id, port->device_id, |
| port->revision, port->thunderbolt_version, tb_port_type(port), |
| port->type); |
| tb_dbg(tb, " Max hop id (in/out): %d/%d\n", |
| port->max_in_hop_id, port->max_out_hop_id); |
| tb_dbg(tb, " Max counters: %d\n", port->max_counters); |
| tb_dbg(tb, " NFC Credits: %#x\n", port->nfc_credits); |
| } |
| |
| /** |
| * tb_port_state() - get connectedness state of a port |
| * |
| * 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. |
| */ |
| static 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 |
| * |
| * 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); |
| if (state < 0) |
| return state; |
| if (state == TB_PORT_DISABLED) { |
| tb_port_info(port, "is disabled (state: 0)\n"); |
| return 0; |
| } |
| if (state == TB_PORT_UNPLUGGED) { |
| if (wait_if_unplugged) { |
| /* used during resume */ |
| tb_port_info(port, |
| "is unplugged (state: 7), retrying...\n"); |
| msleep(100); |
| continue; |
| } |
| tb_port_info(port, "is unplugged (state: 7)\n"); |
| return 0; |
| } |
| if (state == TB_PORT_UP) { |
| tb_port_info(port, |
| "is connected, link is up (state: 2)\n"); |
| return 1; |
| } |
| |
| /* |
| * After plug-in the state is TB_PORT_CONNECTING. Give it some |
| * time. |
| */ |
| tb_port_info(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 |
| * |
| * 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) |
| { |
| if (credits == 0) |
| return 0; |
| tb_port_info(port, |
| "adding %#x NFC credits (%#x -> %#x)", |
| credits, |
| port->config.nfc_credits, |
| port->config.nfc_credits + credits); |
| port->config.nfc_credits += credits; |
| return tb_port_write(port, &port->config.nfc_credits, |
| TB_CFG_PORT, 4, 1); |
| } |
| |
| /** |
| * tb_port_clear_counter() - clear a counter in TB_CFG_COUNTER |
| * |
| * 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_info(port, "clearing counter %d\n", counter); |
| return tb_port_write(port, zero, TB_CFG_COUNTERS, 3 * counter, 3); |
| } |
| |
| /** |
| * 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; |
| |
| res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8); |
| if (res) |
| return res; |
| |
| /* Port 0 is the switch itself and has no PHY. */ |
| if (port->config.type == TB_TYPE_PORT && port->port != 0) { |
| 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"); |
| } |
| |
| tb_dump_port(port->sw->tb, &port->config); |
| |
| /* TODO: Read dual link port, DP port and more from EEPROM. */ |
| return 0; |
| |
| } |
| |
| /* switch utility functions */ |
| |
| static void tb_dump_switch(struct tb *tb, struct tb_regs_switch_header *sw) |
| { |
| tb_dbg(tb, " Switch: %x:%x (Revision: %d, TB Version: %d)\n", |
| sw->vendor_id, sw->device_id, sw->revision, |
| sw->thunderbolt_version); |
| tb_dbg(tb, " Max Port Number: %d\n", sw->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", |
| sw->upstream_port_number, sw->depth, |
| (((u64) sw->route_hi) << 32) | sw->route_lo, |
| sw->enabled, sw->plug_events_delay); |
| tb_dbg(tb, " unknown1: %#x unknown4: %#x\n", |
| sw->__unknown1, sw->__unknown4); |
| } |
| |
| /** |
| * reset_switch() - reconfigure route, enable and send TB_CFG_PKG_RESET |
| * |
| * Return: Returns 0 on success or an error code on failure. |
| */ |
| int tb_switch_reset(struct tb *tb, u64 route) |
| { |
| struct tb_cfg_result res; |
| struct tb_regs_switch_header header = { |
| header.route_hi = route >> 32, |
| header.route_lo = route, |
| header.enabled = true, |
| }; |
| tb_dbg(tb, "resetting switch at %llx\n", route); |
| res.err = tb_cfg_write(tb->ctl, ((u32 *) &header) + 2, route, |
| 0, 2, 2, 2); |
| if (res.err) |
| return res.err; |
| res = tb_cfg_reset(tb->ctl, route, TB_CFG_DEFAULT_TIMEOUT); |
| if (res.err > 0) |
| return -EIO; |
| return res.err; |
| } |
| |
| struct tb_switch *get_switch_at_route(struct tb_switch *sw, u64 route) |
| { |
| u8 next_port = route; /* |
| * Routes use a stride of 8 bits, |
| * eventhough a port index has 6 bits at most. |
| * */ |
| if (route == 0) |
| return sw; |
| if (next_port > sw->config.max_port_number) |
| return NULL; |
| if (tb_is_upstream_port(&sw->ports[next_port])) |
| return NULL; |
| if (!sw->ports[next_port].remote) |
| return NULL; |
| return get_switch_at_route(sw->ports[next_port].remote->sw, |
| route >> TB_ROUTE_SHIFT); |
| } |
| |
| /** |
| * 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 (!sw->config.enabled) |
| 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: |
| data |= 4; |
| } |
| } 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 sprintf(buf, "%u\n", sw->authorized); |
| } |
| |
| static int tb_switch_set_authorized(struct tb_switch *sw, unsigned int val) |
| { |
| int ret = -EINVAL; |
| |
| if (mutex_lock_interruptible(&switch_lock)) |
| return -ERESTARTSYS; |
| |
| if (sw->authorized) |
| goto unlock; |
| |
| /* |
| * Make sure there is no PCIe rescan ongoing when a new PCIe |
| * tunnel is created. Otherwise the PCIe rescan code might find |
| * the new tunnel too early. |
| */ |
| pci_lock_rescan_remove(); |
| pm_runtime_get_sync(&sw->dev); |
| |
| switch (val) { |
| /* 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; |
| } |
| |
| pm_runtime_mark_last_busy(&sw->dev); |
| pm_runtime_put_autosuspend(&sw->dev); |
| pci_unlock_rescan_remove(); |
| |
| if (!ret) { |
| sw->authorized = val; |
| /* Notify status change to the userspace */ |
| kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE); |
| } |
| |
| unlock: |
| mutex_unlock(&switch_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; |
| |
| ret = tb_switch_set_authorized(sw, val); |
| |
| 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 sprintf(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 sprintf(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 sprintf(buf, "%s\n", sw->device_name ? sw->device_name : ""); |
| } |
| static DEVICE_ATTR_RO(device_name); |
| |
| 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_lock_interruptible(&switch_lock)) |
| return -ERESTARTSYS; |
| |
| if (sw->key) |
| ret = sprintf(buf, "%*phN\n", TB_SWITCH_KEY_SIZE, sw->key); |
| else |
| ret = sprintf(buf, "\n"); |
| |
| mutex_unlock(&switch_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_lock_interruptible(&switch_lock)) |
| return -ERESTARTSYS; |
| |
| 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(&switch_lock); |
| return ret; |
| } |
| static DEVICE_ATTR(key, 0600, key_show, key_store); |
| |
| static void nvm_authenticate_start(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 = pci_find_pcie_root_port(sw->tb->nhi->pdev); |
| if (root_port) |
| pm_runtime_get_noresume(&root_port->dev); |
| } |
| |
| static void nvm_authenticate_complete(struct tb_switch *sw) |
| { |
| struct pci_dev *root_port; |
| |
| root_port = pci_find_pcie_root_port(sw->tb->nhi->pdev); |
| if (root_port) |
| pm_runtime_put(&root_port->dev); |
| } |
| |
| 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 sprintf(buf, "%#x\n", status); |
| } |
| |
| static ssize_t nvm_authenticate_store(struct device *dev, |
| struct device_attribute *attr, const char *buf, size_t count) |
| { |
| struct tb_switch *sw = tb_to_switch(dev); |
| bool val; |
| int ret; |
| |
| if (mutex_lock_interruptible(&switch_lock)) |
| return -ERESTARTSYS; |
| |
| /* If NVMem devices are not yet added */ |
| if (!sw->nvm) { |
| ret = -EAGAIN; |
| goto exit_unlock; |
| } |
| |
| ret = kstrtobool(buf, &val); |
| if (ret) |
| goto exit_unlock; |
| |
| /* Always clear the authentication status */ |
| nvm_clear_auth_status(sw); |
| |
| if (val) { |
| if (!sw->nvm->buf) { |
| ret = -EINVAL; |
| goto exit_unlock; |
| } |
| |
| pm_runtime_get_sync(&sw->dev); |
| ret = nvm_validate_and_write(sw); |
| if (ret) { |
| pm_runtime_mark_last_busy(&sw->dev); |
| pm_runtime_put_autosuspend(&sw->dev); |
| goto exit_unlock; |
| } |
| |
| sw->nvm->authenticating = true; |
| |
| if (!tb_route(sw)) { |
| /* |
| * Keep root port from suspending as long as the |
| * NVM upgrade process is running. |
| */ |
| nvm_authenticate_start(sw); |
| ret = nvm_authenticate_host(sw); |
| if (ret) |
| nvm_authenticate_complete(sw); |
| } else { |
| ret = nvm_authenticate_device(sw); |
| } |
| pm_runtime_mark_last_busy(&sw->dev); |
| pm_runtime_put_autosuspend(&sw->dev); |
| } |
| |
| exit_unlock: |
| mutex_unlock(&switch_lock); |
| |
| if (ret) |
| return ret; |
| return count; |
| } |
| static DEVICE_ATTR_RW(nvm_authenticate); |
| |
| 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_lock_interruptible(&switch_lock)) |
| return -ERESTARTSYS; |
| |
| if (sw->safe_mode) |
| ret = -ENODATA; |
| else if (!sw->nvm) |
| ret = -EAGAIN; |
| else |
| ret = sprintf(buf, "%x.%x\n", sw->nvm->major, sw->nvm->minor); |
| |
| mutex_unlock(&switch_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 sprintf(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 sprintf(buf, "%s\n", sw->vendor_name ? 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 sprintf(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_key.attr, |
| &dev_attr_nvm_authenticate.attr, |
| &dev_attr_nvm_version.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 = container_of(kobj, struct device, kobj); |
| struct tb_switch *sw = tb_to_switch(dev); |
| |
| 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_nvm_authenticate.attr || |
| attr == &dev_attr_nvm_version.attr) { |
| if (sw->dma_port) |
| return attr->mode; |
| return 0; |
| } else if (attr == &dev_attr_boot.attr) { |
| if (tb_route(sw)) |
| return attr->mode; |
| return 0; |
| } |
| |
| return sw->safe_mode ? 0 : attr->mode; |
| } |
| |
| static 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); |
| |
| dma_port_free(sw->dma_port); |
| |
| kfree(sw->uuid); |
| kfree(sw->device_name); |
| kfree(sw->vendor_name); |
| kfree(sw->ports); |
| kfree(sw->drom); |
| kfree(sw->key); |
| kfree(sw); |
| } |
| |
| /* |
| * 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) |
| { |
| return 0; |
| } |
| |
| static int __maybe_unused tb_switch_runtime_resume(struct device *dev) |
| { |
| 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) |
| }; |
| |
| struct device_type tb_switch_type = { |
| .name = "thunderbolt_device", |
| .release = tb_switch_release, |
| .pm = &tb_switch_pm_ops, |
| }; |
| |
| static int tb_switch_get_generation(struct tb_switch *sw) |
| { |
| 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: |
| return 3; |
| |
| default: |
| /* |
| * 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; |
| } |
| } |
| |
| /** |
| * 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 %NULL in case of failure |
| */ |
| struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent, |
| u64 route) |
| { |
| int i; |
| int cap; |
| struct tb_switch *sw; |
| int upstream_port = tb_cfg_get_upstream_port(tb->ctl, route); |
| if (upstream_port < 0) |
| return NULL; |
| |
| sw = kzalloc(sizeof(*sw), GFP_KERNEL); |
| if (!sw) |
| return NULL; |
| |
| sw->tb = tb; |
| if (tb_cfg_read(tb->ctl, &sw->config, route, 0, TB_CFG_SWITCH, 0, 5)) |
| goto err_free_sw_ports; |
| |
| tb_dbg(tb, "current switch config:\n"); |
| tb_dump_switch(tb, &sw->config); |
| |
| /* configure switch */ |
| sw->config.upstream_port_number = upstream_port; |
| sw->config.depth = tb_route_length(route); |
| sw->config.route_lo = route; |
| sw->config.route_hi = route >> 32; |
| sw->config.enabled = 0; |
| |
| /* initialize ports */ |
| sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports), |
| GFP_KERNEL); |
| if (!sw->ports) |
| 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; |
| } |
| |
| sw->generation = tb_switch_get_generation(sw); |
| |
| cap = tb_switch_find_vse_cap(sw, TB_VSE_CAP_PLUG_EVENTS); |
| if (cap < 0) { |
| tb_sw_warn(sw, "cannot find TB_VSE_CAP_PLUG_EVENTS aborting\n"); |
| goto err_free_sw_ports; |
| } |
| sw->cap_plug_events = cap; |
| |
| /* 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 NULL; |
| } |
| |
| /** |
| * 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 %NULL 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 NULL; |
| |
| 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. |
| * |
| * 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, "initializing Switch at %#llx (depth: %d, up port: %d)\n", |
| route, tb_route_length(route), sw->config.upstream_port_number); |
| |
| if (sw->config.vendor_id != PCI_VENDOR_ID_INTEL) |
| tb_sw_warn(sw, "unknown switch vendor id %#x\n", |
| sw->config.vendor_id); |
| |
| sw->config.enabled = 1; |
| |
| /* upload configuration */ |
| ret = tb_sw_write(sw, 1 + (u32 *)&sw->config, TB_CFG_SWITCH, 1, 3); |
| if (ret) |
| return ret; |
| |
| return tb_plug_events_active(sw, true); |
| } |
| |
| static void tb_switch_set_uuid(struct tb_switch *sw) |
| { |
| u32 uuid[4]; |
| int cap; |
| |
| if (sw->uuid) |
| return; |
| |
| /* |
| * The newer controllers include fused UUID as part of link |
| * controller specific registers |
| */ |
| cap = tb_switch_find_vse_cap(sw, TB_VSE_CAP_LINK_CONTROLLER); |
| if (cap > 0) { |
| tb_sw_read(sw, uuid, TB_CFG_SWITCH, cap + 3, 4); |
| } else { |
| /* |
| * 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); |
| } |
| |
| static int tb_switch_add_dma_port(struct tb_switch *sw) |
| { |
| u32 status; |
| int ret; |
| |
| switch (sw->generation) { |
| case 3: |
| break; |
| |
| case 2: |
| /* Only root switch can be upgraded */ |
| if (tb_route(sw)) |
| return 0; |
| 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; |
| |
| sw->dma_port = dma_port_alloc(sw); |
| if (!sw->dma_port) |
| 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(sw); |
| |
| if (status) { |
| tb_sw_info(sw, "switch flash authentication failed\n"); |
| tb_switch_set_uuid(sw); |
| 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; |
| } |
| |
| /** |
| * 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; |
| |
| /* |
| * Initialize DMA control port now before we read DROM. Recent |
| * host controllers have more complete DROM on NVM that includes |
| * vendor and model identification strings which we then expose |
| * to the userspace. NVM can be accessed through DMA |
| * configuration based mailbox. |
| */ |
| ret = tb_switch_add_dma_port(sw); |
| if (ret) |
| return ret; |
| |
| if (!sw->safe_mode) { |
| /* read drom */ |
| ret = tb_drom_read(sw); |
| if (ret) { |
| tb_sw_warn(sw, "tb_eeprom_read_rom failed\n"); |
| return ret; |
| } |
| tb_sw_dbg(sw, "uid: %#llx\n", sw->uid); |
| |
| tb_switch_set_uuid(sw); |
| |
| for (i = 0; i <= sw->config.max_port_number; i++) { |
| if (sw->ports[i].disabled) { |
| tb_port_dbg(&sw->ports[i], "disabled by eeprom\n"); |
| continue; |
| } |
| ret = tb_init_port(&sw->ports[i]); |
| if (ret) |
| return ret; |
| } |
| } |
| |
| ret = device_add(&sw->dev); |
| if (ret) |
| return ret; |
| |
| if (tb_route(sw)) { |
| dev_info(&sw->dev, "new device found, vendor=%#x device=%#x\n", |
| sw->vendor, sw->device); |
| if (sw->vendor_name && sw->device_name) |
| dev_info(&sw->dev, "%s %s\n", sw->vendor_name, |
| sw->device_name); |
| } |
| |
| ret = tb_switch_nvm_add(sw); |
| if (ret) { |
| device_del(&sw->dev); |
| return ret; |
| } |
| |
| pm_runtime_set_active(&sw->dev); |
| if (sw->rpm) { |
| pm_runtime_set_autosuspend_delay(&sw->dev, TB_AUTOSUSPEND_DELAY); |
| pm_runtime_use_autosuspend(&sw->dev); |
| pm_runtime_mark_last_busy(&sw->dev); |
| pm_runtime_enable(&sw->dev); |
| pm_request_autosuspend(&sw->dev); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * tb_switch_remove() - Remove and release a switch |
| * @sw: Switch to remove |
| * |
| * This will remove the switch from the domain and release it after last |
| * reference count drops to zero. If there are switches connected below |
| * this switch, they will be removed as well. |
| */ |
| void tb_switch_remove(struct tb_switch *sw) |
| { |
| int i; |
| |
| if (sw->rpm) { |
| pm_runtime_get_sync(&sw->dev); |
| pm_runtime_disable(&sw->dev); |
| } |
| |
| /* port 0 is the switch itself and never has a remote */ |
| for (i = 1; i <= sw->config.max_port_number; i++) { |
| if (tb_is_upstream_port(&sw->ports[i])) |
| continue; |
| if (sw->ports[i].remote) |
| tb_switch_remove(sw->ports[i].remote->sw); |
| sw->ports[i].remote = NULL; |
| if (sw->ports[i].xdomain) |
| tb_xdomain_remove(sw->ports[i].xdomain); |
| sw->ports[i].xdomain = NULL; |
| } |
| |
| if (!sw->is_unplugged) |
| tb_plug_events_active(sw, false); |
| |
| tb_switch_nvm_remove(sw); |
| |
| if (tb_route(sw)) |
| dev_info(&sw->dev, "device disconnected\n"); |
| device_unregister(&sw->dev); |
| } |
| |
| /** |
| * tb_sw_set_unplugged() - set is_unplugged on switch and downstream switches |
| */ |
| void tb_sw_set_unplugged(struct tb_switch *sw) |
| { |
| int i; |
| if (sw == sw->tb->root_switch) { |
| tb_sw_WARN(sw, "cannot unplug root switch\n"); |
| return; |
| } |
| if (sw->is_unplugged) { |
| tb_sw_WARN(sw, "is_unplugged already set\n"); |
| return; |
| } |
| sw->is_unplugged = true; |
| for (i = 0; i <= sw->config.max_port_number; i++) { |
| if (!tb_is_upstream_port(&sw->ports[i]) && sw->ports[i].remote) |
| tb_sw_set_unplugged(sw->ports[i].remote->sw); |
| } |
| } |
| |
| int tb_switch_resume(struct tb_switch *sw) |
| { |
| int i, err; |
| tb_sw_dbg(sw, "resuming switch\n"); |
| |
| /* |
| * Check for UID of the connected switches except for root |
| * switch which we assume cannot be removed. |
| */ |
| if (tb_route(sw)) { |
| u64 uid; |
| |
| err = tb_drom_read_uid_only(sw, &uid); |
| if (err) { |
| tb_sw_warn(sw, "uid read failed\n"); |
| return err; |
| } |
| if (sw->uid != uid) { |
| tb_sw_info(sw, |
| "changed while suspended (uid %#llx -> %#llx)\n", |
| sw->uid, uid); |
| return -ENODEV; |
| } |
| } |
| |
| /* upload configuration */ |
| err = tb_sw_write(sw, 1 + (u32 *) &sw->config, TB_CFG_SWITCH, 1, 3); |
| if (err) |
| return err; |
| |
| err = tb_plug_events_active(sw, true); |
| if (err) |
| return err; |
| |
| /* check for surviving downstream switches */ |
| for (i = 1; i <= sw->config.max_port_number; i++) { |
| struct tb_port *port = &sw->ports[i]; |
| if (tb_is_upstream_port(port)) |
| continue; |
| if (!port->remote) |
| continue; |
| if (tb_wait_for_port(port, true) <= 0 |
| || tb_switch_resume(port->remote->sw)) { |
| tb_port_warn(port, |
| "lost during suspend, disconnecting\n"); |
| tb_sw_set_unplugged(port->remote->sw); |
| } |
| } |
| return 0; |
| } |
| |
| void tb_switch_suspend(struct tb_switch *sw) |
| { |
| int i, err; |
| err = tb_plug_events_active(sw, false); |
| if (err) |
| return; |
| |
| for (i = 1; i <= sw->config.max_port_number; i++) { |
| if (!tb_is_upstream_port(&sw->ports[i]) && sw->ports[i].remote) |
| tb_switch_suspend(sw->ports[i].remote->sw); |
| } |
| /* |
| * TODO: invoke tb_cfg_prepare_to_sleep here? does not seem to have any |
| * effect? |
| */ |
| } |
| |
| struct tb_sw_lookup { |
| struct tb *tb; |
| u8 link; |
| u8 depth; |
| const uuid_t *uuid; |
| u64 route; |
| }; |
| |
| static int tb_switch_match(struct device *dev, void *data) |
| { |
| struct tb_switch *sw = tb_to_switch(dev); |
| struct tb_sw_lookup *lookup = data; |
| |
| if (!sw) |
| return 0; |
| if (sw->tb != lookup->tb) |
| return 0; |
| |
| if (lookup->uuid) |
| return !memcmp(sw->uuid, lookup->uuid, sizeof(*lookup->uuid)); |
| |
| if (lookup->route) { |
| return sw->config.route_lo == lower_32_bits(lookup->route) && |
| sw->config.route_hi == upper_32_bits(lookup->route); |
| } |
| |
| /* Root switch is matched only by depth */ |
| if (!lookup->depth) |
| return !sw->depth; |
| |
| return sw->link == lookup->link && sw->depth == lookup->depth; |
| } |
| |
| /** |
| * tb_switch_find_by_link_depth() - Find switch by link and depth |
| * @tb: Domain the switch belongs |
| * @link: Link number the switch is connected |
| * @depth: Depth of the switch in link |
| * |
| * Returned switch has reference count increased so the caller needs to |
| * call tb_switch_put() when done with the switch. |
| */ |
| struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link, u8 depth) |
| { |
| struct tb_sw_lookup lookup; |
| struct device *dev; |
| |
| memset(&lookup, 0, sizeof(lookup)); |
| lookup.tb = tb; |
| lookup.link = link; |
| lookup.depth = depth; |
| |
| dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match); |
| if (dev) |
| return tb_to_switch(dev); |
| |
| return NULL; |
| } |
| |
| /** |
| * tb_switch_find_by_uuid() - Find switch by UUID |
| * @tb: Domain the switch belongs |
| * @uuid: UUID to look for |
| * |
| * Returned switch has reference count increased so the caller needs to |
| * call tb_switch_put() when done with the switch. |
| */ |
| struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_t *uuid) |
| { |
| struct tb_sw_lookup lookup; |
| struct device *dev; |
| |
| memset(&lookup, 0, sizeof(lookup)); |
| lookup.tb = tb; |
| lookup.uuid = uuid; |
| |
| dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match); |
| if (dev) |
| return tb_to_switch(dev); |
| |
| return NULL; |
| } |
| |
| /** |
| * tb_switch_find_by_route() - Find switch by route string |
| * @tb: Domain the switch belongs |
| * @route: Route string to look for |
| * |
| * Returned switch has reference count increased so the caller needs to |
| * call tb_switch_put() when done with the switch. |
| */ |
| struct tb_switch *tb_switch_find_by_route(struct tb *tb, u64 route) |
| { |
| struct tb_sw_lookup lookup; |
| struct device *dev; |
| |
| if (!route) |
| return tb_switch_get(tb->root_switch); |
| |
| memset(&lookup, 0, sizeof(lookup)); |
| lookup.tb = tb; |
| lookup.route = route; |
| |
| dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match); |
| if (dev) |
| return tb_to_switch(dev); |
| |
| return NULL; |
| } |
| |
| void tb_switch_exit(void) |
| { |
| ida_destroy(&nvm_ida); |
| } |