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97 kB · 4035 lines
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7402840294030403140324033403440354036// 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/hex.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_obj(*st); 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 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){ struct tb_nhi *nhi = sw->tb->nhi; 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)) { if (nhi->ops->pre_nvm_auth) nhi->ops->pre_nvm_auth(nhi); 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. * * Return: %0 on success, negative errno otherwise. */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_init(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;
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 int tb_switch_nvm_add(struct tb_switch *sw){ struct tb_nvm *nvm = sw->nvm; int ret;
if (!nvm) return 0;
/* * 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; }
return 0;
err_nvm: tb_sw_dbg(sw, "NVM upgrade disabled\n"); sw->no_nvm_upgrade = true; 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: &enum tb_port_state or negative 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: * * %0 - If the port is not connected or failed to reach * state %TB_PORT_UP within one second. * * %1 - If the port is connected and in state %TB_PORT_UP. * * Negative errno - An error occurred. */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: %0 on success, negative errno otherwise. */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: %0 on success, negative errno otherwise. */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. * * Return: %0 on success, negative errno otherwise. */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. * * Return: %0 on success, negative errno otherwise. */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. * * Return: %0 on success, negative errno otherwise. */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: %0 on success, negative errno otherwise. */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 port buffers allocated for the control path * can be read from the path config space. Legacy * devices 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. * * Domain tb->lock must be held when this function is called. * * Return: Pointer to &struct tb_port, %NULL if the @end port has been reached. */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) * * Return: 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 * * Return: Link generation as a 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) * * Return: Link width 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. * * Return: %true if link width is supported, %false otherwise. */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 on success, negative errno otherwise. */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 on success, negative errno otherwise. */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 on success, negative errno otherwise. */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. * * Can be passed a mask of expected widths. * * Return: * * %0 - If link reaches any of the specified widths. * * %-ETIMEDOUT - If link does not reach specified width. * * Negative errno - Another error occurred. */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. * * Return: %0 on success, negative errno otherwise. */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 * * Return: %true if port is enabled, %false otherwise. */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 * * Return: %true if port is enabled, %false otherwise. */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 * * Return: %0 on success, negative errno otherwise. */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 * * Return: %true if port is enabled, %false otherwise. */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 * * Return: %0 on success, negative errno otherwise. */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. * * Return: %1 if HPD is active, %0 otherwise. */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. * * Return: %0 on success, negative errno otherwise. */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. * * Return: %0 on success, negative errno otherwise. */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_TX_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 * * Return: %true if DP port is enabled, %false otherwise. */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. * * Return: %0 on success, negative errno otherwise. */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; /* * USB4 Lane 1 adapters do not have accessible * path config space. */ if (tb_switch_is_usb4(sw) && !port->usb4) continue; } 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. * * Return: %0 on success, negative errno otherwise. */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. * * Return: * * %0 - On success. * * %-ETIMEDOUT - If the @value was not reached within * the given timeout. * * 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 * * Return: %0 on success, negative errno otherwise. */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;
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_tdevice_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_tgeneration_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_tvendor_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 &struct tb_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_obj(*sw); 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 = kzalloc_objs(*sw->ports, sw->config.max_port_number + 1); 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 &struct tb_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_obj(*sw); 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 on success, negative errno otherwise. */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;
/* Set Notification Timeout to 255 ms for all routers */ sw->config.plug_events_delay = 0xff; 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;
/* 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, 4); } 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. * * Return: %0 on success, 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){ struct tb_nhi *nhi = sw->tb->nhi; 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)) { if (nhi->ops->post_nvm_auth) nhi->ops->post_nvm_auth(nhi); } 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)) { if (nhi->ops->post_nvm_auth) nhi->ops->post_nvm_auth(nhi); }
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. * * Return: %0 on success, negative errno otherwise. */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 -EOPNOTSUPP;
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 -EOPNOTSUPP;
/* * 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. * * Return: %0 on success, negative errno otherwise. */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 both side * of the link supports it. * * Does nothing for host router. * * Return: %0 on 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. * * Return: %0 on success and negative errno otherwise. */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 exits 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 on success, negative errno otherwise. */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) { dev_err(&sw->dev, "failed to add DMA port\n"); return ret; }
ret = tb_switch_nvm_init(sw); if (ret) return ret;
if (!sw->safe_mode) { tb_switch_credits_init(sw);
/* read drom */ ret = tb_drom_read(sw); if (ret) dev_warn(&sw->dev, "reading DROM failed: %d\n", ret); tb_sw_dbg(sw, "uid: %#llx\n", sw->uid);
ret = tb_switch_set_uuid(sw); if (ret) { dev_err(&sw->dev, "failed to set UUID\n"); return ret; }
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) { dev_err(&sw->dev, "failed to initialize port %d\n", i); return ret; } }
tb_check_quirks(sw);
tb_switch_default_link_ports(sw);
ret = tb_switch_update_link_attributes(sw); if (ret) return ret;
tb_switch_link_init(sw);
ret = tb_switch_clx_init(sw); if (ret) return ret;
ret = tb_switch_tmu_init(sw); if (ret) return ret; }
ret = tb_switch_port_hotplug_enable(sw); if (ret) return ret;
ret = device_add(&sw->dev); if (ret) { dev_err(&sw->dev, "failed to add device: %d\n", 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 = usb4_switch_add_ports(sw); if (ret) { dev_err(&sw->dev, "failed to add USB4 ports\n"); goto err_del; }
ret = tb_switch_nvm_add(sw); if (ret) { dev_err(&sw->dev, "failed to add NVM devices\n"); goto err_ports; }
/* * Thunderbolt routers do not generate wakeups themselves but * they forward wakeups from tunneled protocols, so enable it * here. */ device_init_wakeup(&sw->dev, true);
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); }
tb_switch_debugfs_init(sw); return 0;
err_ports: usb4_switch_remove_ports(sw);err_del: device_del(&sw->dev);
return ret;}
/** * 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){ struct tb_port *port;
tb_switch_debugfs_remove(sw);
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 */ tb_switch_for_each_port(sw, port) { if (tb_port_has_remote(port)) { tb_switch_remove(port->remote->sw); port->remote = NULL; } else if (port->xdomain) { port->xdomain->is_unplugged = true; tb_xdomain_remove(port->xdomain); port->xdomain = NULL; }
/* Remove any downstream retimers */ tb_retimer_remove_all(port); }
if (!sw->is_unplugged) tb_plug_events_active(sw, false);
tb_switch_nvm_remove(sw); usb4_switch_remove_ports(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 * @sw: Router to mark unplugged */void tb_sw_set_unplugged(struct tb_switch *sw){ struct tb_port *port;
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; tb_switch_for_each_port(sw, port) { if (tb_port_has_remote(port)) tb_sw_set_unplugged(port->remote->sw); else if (port->xdomain) port->xdomain->is_unplugged = true; }}
static int tb_switch_set_wake(struct tb_switch *sw, unsigned int flags, bool runtime){ if (flags) tb_sw_dbg(sw, "enabling wakeup: %#x\n", flags); else tb_sw_dbg(sw, "disabling wakeup\n");
if (tb_switch_is_usb4(sw)) return usb4_switch_set_wake(sw, flags, runtime); return tb_lc_set_wake(sw, flags);}
static void tb_switch_check_wakes(struct tb_switch *sw){ if (device_may_wakeup(&sw->dev)) { if (tb_switch_is_usb4(sw)) usb4_switch_check_wakes(sw); }}
/** * tb_switch_resume() - Resume a switch after sleep * @sw: Switch to resume * @runtime: Is this resume from runtime suspend or system sleep * * Resumes and re-enumerates router (and all its children), if still plugged * after suspend. Don't enumerate device router whose UID was changed during * suspend. If this is resume from system sleep, notifies PM core about the * wakes occurred during suspend. Disables all wakes, except USB4 wake of * upstream port for USB4 routers that shall be always enabled. * * Return: %0 on success, negative errno otherwise. */int tb_switch_resume(struct tb_switch *sw, bool runtime){ struct tb_port *port; int 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;
/* * Check first that we can still read the switch config * space. It may be that there is now another domain * connected. */ err = tb_cfg_get_upstream_port(sw->tb->ctl, tb_route(sw)); if (err < 0) { tb_sw_info(sw, "switch not present anymore\n"); return err; }
/* We don't have any way to confirm this was the same device */ if (!sw->uid) return -ENODEV;
if (tb_switch_is_usb4(sw)) err = usb4_switch_read_uid(sw, &uid); else 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; } }
err = tb_switch_configure(sw); if (err) return err;
if (!runtime) tb_switch_check_wakes(sw);
/* Disable wakes */ tb_switch_set_wake(sw, 0, true);
err = tb_switch_tmu_init(sw); if (err) return err;
/* check for surviving downstream switches */ tb_switch_for_each_port(sw, port) { if (!tb_port_is_null(port)) continue;
if (!tb_port_resume(port)) continue;
if (tb_wait_for_port(port, true) <= 0) { tb_port_warn(port, "lost during suspend, disconnecting\n"); if (tb_port_has_remote(port)) tb_sw_set_unplugged(port->remote->sw); else if (port->xdomain) port->xdomain->is_unplugged = true; } else { /* * Always unlock the port so the downstream * switch/domain is accessible. */ if (tb_port_unlock(port)) tb_port_warn(port, "failed to unlock port\n"); if (port->remote && tb_switch_resume(port->remote->sw, runtime)) { tb_port_warn(port, "lost during suspend, disconnecting\n"); tb_sw_set_unplugged(port->remote->sw); } else if (port->xdomain) { /* * If the user replaced the XDomain with * another router, this will succeed in * which case we must remove the XDomain * before adding the new router. */ err = tb_cfg_get_upstream_port(sw->tb->ctl, port->xdomain->route); if (err > 0) { tb_port_warn(port, "XDomain was disconnected\n"); port->xdomain->is_unplugged = true; } } } } return 0;}
/** * tb_switch_suspend() - Put a switch to sleep * @sw: Switch to suspend * @runtime: Is this runtime suspend or system sleep * * Suspends router and all its children. Enables wakes according to * value of @runtime and then sets sleep bit for the router. If @sw is * host router the domain is ready to go to sleep once this function * returns. */void tb_switch_suspend(struct tb_switch *sw, bool runtime){ unsigned int flags = 0; struct tb_port *port; int err;
tb_sw_dbg(sw, "suspending switch\n");
/* * Actually only needed for Titan Ridge but for simplicity can be * done for USB4 device too as CLx is re-enabled at resume. */ tb_switch_clx_disable(sw);
err = tb_plug_events_active(sw, false); if (err) return;
tb_switch_for_each_port(sw, port) { if (tb_port_has_remote(port)) tb_switch_suspend(port->remote->sw, runtime); }
if (runtime) { /* Trigger wake when something is plugged in/out */ flags |= TB_WAKE_ON_CONNECT | TB_WAKE_ON_DISCONNECT; flags |= TB_WAKE_ON_USB4; flags |= TB_WAKE_ON_USB3 | TB_WAKE_ON_PCIE | TB_WAKE_ON_DP; } else if (device_may_wakeup(&sw->dev)) { flags |= TB_WAKE_ON_CONNECT | TB_WAKE_ON_DISCONNECT; flags |= TB_WAKE_ON_USB4 | TB_WAKE_ON_USB3 | TB_WAKE_ON_PCIE; }
tb_switch_set_wake(sw, flags, runtime);
if (tb_switch_is_usb4(sw)) usb4_switch_set_sleep(sw); else tb_lc_set_sleep(sw);}
/** * tb_switch_query_dp_resource() - Query availability of DP resource * @sw: Switch whose DP resource is queried * @in: DP IN port * * Queries availability of DP resource for DP tunneling using switch * specific means. * * Return: %true if resource is available, %false otherwise. */bool tb_switch_query_dp_resource(struct tb_switch *sw, struct tb_port *in){ if (tb_switch_is_usb4(sw)) return usb4_switch_query_dp_resource(sw, in); return tb_lc_dp_sink_query(sw, in);}
/** * tb_switch_alloc_dp_resource() - Allocate available DP resource * @sw: Switch whose DP resource is allocated * @in: DP IN port * * Allocates DP resource for DP tunneling. The resource must be * available for this to succeed (see tb_switch_query_dp_resource()). * * Return: %0 on success, negative errno otherwise. */int tb_switch_alloc_dp_resource(struct tb_switch *sw, struct tb_port *in){ int ret;
if (tb_switch_is_usb4(sw)) ret = usb4_switch_alloc_dp_resource(sw, in); else ret = tb_lc_dp_sink_alloc(sw, in);
if (ret) tb_sw_warn(sw, "failed to allocate DP resource for port %d\n", in->port); else tb_sw_dbg(sw, "allocated DP resource for port %d\n", in->port);
return ret;}
/** * tb_switch_dealloc_dp_resource() - De-allocate DP resource * @sw: Switch whose DP resource is de-allocated * @in: DP IN port * * De-allocates DP resource that was previously allocated for DP * tunneling. */void tb_switch_dealloc_dp_resource(struct tb_switch *sw, struct tb_port *in){ int ret;
if (tb_switch_is_usb4(sw)) ret = usb4_switch_dealloc_dp_resource(sw, in); else ret = tb_lc_dp_sink_dealloc(sw, in);
if (ret) tb_sw_warn(sw, "failed to de-allocate DP resource for port %d\n", in->port); else tb_sw_dbg(sw, "released DP resource for port %d\n", in->port);}
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, const void *data){ struct tb_switch *sw = tb_to_switch(dev); const 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. * * Return: Pointer to &struct tb_switch, %NULL if not found. */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. * * Return: Pointer to &struct tb_switch, %NULL if not found. */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. * * Return: Pointer to &struct tb_switch, %NULL if not found. */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;}
/** * tb_switch_find_port() - return the first port of @type on @sw or NULL * @sw: Switch to find the port from * @type: Port type to look for * * Return: Pointer to &struct tb_port, %NULL if not found. */struct tb_port *tb_switch_find_port(struct tb_switch *sw, enum tb_port_type type){ struct tb_port *port;
tb_switch_for_each_port(sw, port) { if (port->config.type == type) return port; }
return NULL;}
/* * Can be used for read/write a specified PCIe bridge for any Thunderbolt 3 * device. For now used only for Titan Ridge. */static int tb_switch_pcie_bridge_write(struct tb_switch *sw, unsigned int bridge, unsigned int pcie_offset, u32 value){ u32 offset, command, val; int ret;
if (sw->generation != 3) return -EOPNOTSUPP;
offset = sw->cap_plug_events + TB_PLUG_EVENTS_PCIE_WR_DATA; ret = tb_sw_write(sw, &value, TB_CFG_SWITCH, offset, 1); if (ret) return ret;
command = pcie_offset & TB_PLUG_EVENTS_PCIE_CMD_DW_OFFSET_MASK; command |= BIT(bridge + TB_PLUG_EVENTS_PCIE_CMD_BR_SHIFT); command |= TB_PLUG_EVENTS_PCIE_CMD_RD_WR_MASK; command |= TB_PLUG_EVENTS_PCIE_CMD_COMMAND_VAL << TB_PLUG_EVENTS_PCIE_CMD_COMMAND_SHIFT; command |= TB_PLUG_EVENTS_PCIE_CMD_REQ_ACK_MASK;
offset = sw->cap_plug_events + TB_PLUG_EVENTS_PCIE_CMD;
ret = tb_sw_write(sw, &command, TB_CFG_SWITCH, offset, 1); if (ret) return ret;
ret = tb_switch_wait_for_bit(sw, offset, TB_PLUG_EVENTS_PCIE_CMD_REQ_ACK_MASK, 0, 100); if (ret) return ret;
ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, offset, 1); if (ret) return ret;
if (val & TB_PLUG_EVENTS_PCIE_CMD_TIMEOUT_MASK) return -ETIMEDOUT;
return 0;}
/** * tb_switch_pcie_l1_enable() - Enable PCIe link to enter L1 state * @sw: Router to enable PCIe L1 * * For Titan Ridge switch to enter CLx state, its PCIe bridges shall enable * entry to PCIe L1 state. Shall be called after the upstream PCIe tunnel * was configured. Due to Intel platforms limitation, shall be called only * for first hop switch. * * Return: %0 on success, negative errno otherwise. */int tb_switch_pcie_l1_enable(struct tb_switch *sw){ struct tb_switch *parent = tb_switch_parent(sw); int ret;
if (!tb_route(sw)) return 0;
if (!tb_switch_is_titan_ridge(sw)) return 0;
/* Enable PCIe L1 enable only for first hop router (depth = 1) */ if (tb_route(parent)) return 0;
/* Write to downstream PCIe bridge #5 aka Dn4 */ ret = tb_switch_pcie_bridge_write(sw, 5, 0x143, 0x0c7806b1); if (ret) return ret;
/* Write to Upstream PCIe bridge #0 aka Up0 */ return tb_switch_pcie_bridge_write(sw, 0, 0x143, 0x0c5806b1);}
/** * tb_switch_xhci_connect() - Connect internal xHCI * @sw: Router whose xHCI to connect * * Can be called to any router. For Alpine Ridge and Titan Ridge * performs special flows that bring the xHCI functional for any device * connected to the type-C port. Call only after PCIe tunnel has been * established. The function only does the connect if not done already * so can be called several times for the same router. * * Return: %0 on success, negative errno otherwise. */int tb_switch_xhci_connect(struct tb_switch *sw){ struct tb_port *port1, *port3; int ret;
if (sw->generation != 3) return 0;
port1 = &sw->ports[1]; port3 = &sw->ports[3];
if (tb_switch_is_alpine_ridge(sw)) { bool usb_port1, usb_port3, xhci_port1, xhci_port3;
usb_port1 = tb_lc_is_usb_plugged(port1); usb_port3 = tb_lc_is_usb_plugged(port3); xhci_port1 = tb_lc_is_xhci_connected(port1); xhci_port3 = tb_lc_is_xhci_connected(port3);
/* Figure out correct USB port to connect */ if (usb_port1 && !xhci_port1) { ret = tb_lc_xhci_connect(port1); if (ret) return ret; } if (usb_port3 && !xhci_port3) return tb_lc_xhci_connect(port3); } else if (tb_switch_is_titan_ridge(sw)) { ret = tb_lc_xhci_connect(port1); if (ret) return ret; return tb_lc_xhci_connect(port3); }
return 0;}
/** * tb_switch_xhci_disconnect() - Disconnect internal xHCI * @sw: Router whose xHCI to disconnect * * The opposite of tb_switch_xhci_connect(). Disconnects xHCI on both * ports. */void tb_switch_xhci_disconnect(struct tb_switch *sw){ if (sw->generation == 3) { struct tb_port *port1 = &sw->ports[1]; struct tb_port *port3 = &sw->ports[3];
tb_lc_xhci_disconnect(port1); tb_port_dbg(port1, "disconnected xHCI\n"); tb_lc_xhci_disconnect(port3); tb_port_dbg(port3, "disconnected xHCI\n"); }}