forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
3204 lines
75 KiB
3204 lines
75 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* Thunderbolt driver - switch/port utility functions |
|
* |
|
* Copyright (c) 2014 Andreas Noever <[email protected]> |
|
* 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/sched/signal.h> |
|
#include <linux/sizes.h> |
|
#include <linux/slab.h> |
|
|
|
#include "tb.h" |
|
|
|
/* Switch NVM support */ |
|
|
|
#define NVM_CSS 0x10 |
|
|
|
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; |
|
} |
|
|
|
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) |
|
sw->nvm->flushed = true; |
|
return ret; |
|
} |
|
|
|
static int nvm_authenticate_host_dma_port(struct tb_switch *sw) |
|
{ |
|
int ret = 0; |
|
|
|
/* |
|
* Root switch NVM upgrade requires that we disconnect the |
|
* existing paths first (in case it is not in safe mode |
|
* already). |
|
*/ |
|
if (!sw->safe_mode) { |
|
u32 status; |
|
|
|
ret = tb_domain_disconnect_all_paths(sw->tb); |
|
if (ret) |
|
return ret; |
|
/* |
|
* The host controller goes away pretty soon after this if |
|
* everything goes well so getting timeout is expected. |
|
*/ |
|
ret = dma_port_flash_update_auth(sw->dma_port); |
|
if (!ret || ret == -ETIMEDOUT) |
|
return 0; |
|
|
|
/* |
|
* Any error from update auth operation requires power |
|
* cycling of the host router. |
|
*/ |
|
tb_sw_warn(sw, "failed to authenticate NVM, power cycling\n"); |
|
if (dma_port_flash_update_auth_status(sw->dma_port, &status) > 0) |
|
nvm_set_auth_status(sw, status); |
|
} |
|
|
|
/* |
|
* From safe mode we can get out by just power cycling the |
|
* switch. |
|
*/ |
|
dma_port_power_cycle(sw->dma_port); |
|
return ret; |
|
} |
|
|
|
static int nvm_authenticate_device_dma_port(struct tb_switch *sw) |
|
{ |
|
int ret, retries = 10; |
|
|
|
ret = dma_port_flash_update_auth(sw->dma_port); |
|
switch (ret) { |
|
case 0: |
|
case -ETIMEDOUT: |
|
case -EACCES: |
|
case -EINVAL: |
|
/* Power cycle is required */ |
|
break; |
|
default: |
|
return ret; |
|
} |
|
|
|
/* |
|
* Poll here for the authentication status. It takes some time |
|
* for the device to respond (we get timeout for a while). Once |
|
* we get response the device needs to be power cycled in order |
|
* to the new NVM to be taken into use. |
|
*/ |
|
do { |
|
u32 status; |
|
|
|
ret = dma_port_flash_update_auth_status(sw->dma_port, &status); |
|
if (ret < 0 && ret != -ETIMEDOUT) |
|
return ret; |
|
if (ret > 0) { |
|
if (status) { |
|
tb_sw_warn(sw, "failed to authenticate NVM\n"); |
|
nvm_set_auth_status(sw, status); |
|
} |
|
|
|
tb_sw_info(sw, "power cycling the switch now\n"); |
|
dma_port_power_cycle(sw->dma_port); |
|
return 0; |
|
} |
|
|
|
msleep(500); |
|
} while (--retries); |
|
|
|
return -ETIMEDOUT; |
|
} |
|
|
|
static void nvm_authenticate_start_dma_port(struct tb_switch *sw) |
|
{ |
|
struct pci_dev *root_port; |
|
|
|
/* |
|
* During host router NVM upgrade we should not allow root port to |
|
* go into D3cold because some root ports cannot trigger PME |
|
* itself. To be on the safe side keep the root port in D0 during |
|
* the whole upgrade process. |
|
*/ |
|
root_port = pcie_find_root_port(sw->tb->nhi->pdev); |
|
if (root_port) |
|
pm_runtime_get_noresume(&root_port->dev); |
|
} |
|
|
|
static void nvm_authenticate_complete_dma_port(struct tb_switch *sw) |
|
{ |
|
struct pci_dev *root_port; |
|
|
|
root_port = pcie_find_root_port(sw->tb->nhi->pdev); |
|
if (root_port) |
|
pm_runtime_put(&root_port->dev); |
|
} |
|
|
|
static inline bool nvm_readable(struct tb_switch *sw) |
|
{ |
|
if (tb_switch_is_usb4(sw)) { |
|
/* |
|
* USB4 devices must support NVM operations but it is |
|
* optional for hosts. Therefore we query the NVM sector |
|
* size here and if it is supported assume NVM |
|
* operations are implemented. |
|
*/ |
|
return usb4_switch_nvm_sector_size(sw) > 0; |
|
} |
|
|
|
/* Thunderbolt 2 and 3 devices support NVM through DMA port */ |
|
return !!sw->dma_port; |
|
} |
|
|
|
static inline bool nvm_upgradeable(struct tb_switch *sw) |
|
{ |
|
if (sw->no_nvm_upgrade) |
|
return false; |
|
return nvm_readable(sw); |
|
} |
|
|
|
static inline int 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_authenticate(struct tb_switch *sw, bool auth_only) |
|
{ |
|
int ret; |
|
|
|
if (tb_switch_is_usb4(sw)) { |
|
if (auth_only) { |
|
ret = usb4_switch_nvm_set_offset(sw, 0); |
|
if (ret) |
|
return ret; |
|
} |
|
sw->nvm->authenticating = true; |
|
return usb4_switch_nvm_authenticate(sw); |
|
} else if (auth_only) { |
|
return -EOPNOTSUPP; |
|
} |
|
|
|
sw->nvm->authenticating = true; |
|
if (!tb_route(sw)) { |
|
nvm_authenticate_start_dma_port(sw); |
|
ret = nvm_authenticate_host_dma_port(sw); |
|
} else { |
|
ret = nvm_authenticate_device_dma_port(sw); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static int tb_switch_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 = 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 tb_switch_nvm_write(void *priv, unsigned int offset, void *val, |
|
size_t bytes) |
|
{ |
|
struct tb_nvm *nvm = priv; |
|
struct tb_switch *sw = tb_to_switch(nvm->dev); |
|
int ret; |
|
|
|
if (!mutex_trylock(&sw->tb->lock)) |
|
return restart_syscall(); |
|
|
|
/* |
|
* Since writing the NVM image might require some special steps, |
|
* for example when CSS headers are written, we cache the image |
|
* locally here and handle the special cases when the user asks |
|
* us to authenticate the image. |
|
*/ |
|
ret = tb_nvm_write_buf(nvm, offset, val, bytes); |
|
mutex_unlock(&sw->tb->lock); |
|
|
|
return ret; |
|
} |
|
|
|
static int tb_switch_nvm_add(struct tb_switch *sw) |
|
{ |
|
struct tb_nvm *nvm; |
|
u32 val; |
|
int ret; |
|
|
|
if (!nvm_readable(sw)) |
|
return 0; |
|
|
|
/* |
|
* The NVM format of non-Intel hardware is not known so |
|
* currently restrict NVM upgrade for Intel hardware. We may |
|
* relax this in the future when we learn other NVM formats. |
|
*/ |
|
if (sw->config.vendor_id != PCI_VENDOR_ID_INTEL && |
|
sw->config.vendor_id != 0x8087) { |
|
dev_info(&sw->dev, |
|
"NVM format of vendor %#x is not known, disabling NVM upgrade\n", |
|
sw->config.vendor_id); |
|
return 0; |
|
} |
|
|
|
nvm = tb_nvm_alloc(&sw->dev); |
|
if (IS_ERR(nvm)) |
|
return PTR_ERR(nvm); |
|
|
|
/* |
|
* If the switch is in safe-mode the only accessible portion of |
|
* the NVM is the non-active one where userspace is expected to |
|
* write new functional NVM. |
|
*/ |
|
if (!sw->safe_mode) { |
|
u32 nvm_size, hdr_size; |
|
|
|
ret = nvm_read(sw, NVM_FLASH_SIZE, &val, sizeof(val)); |
|
if (ret) |
|
goto err_nvm; |
|
|
|
hdr_size = sw->generation < 3 ? SZ_8K : SZ_16K; |
|
nvm_size = (SZ_1M << (val & 7)) / 8; |
|
nvm_size = (nvm_size - hdr_size) / 2; |
|
|
|
ret = nvm_read(sw, NVM_VERSION, &val, sizeof(val)); |
|
if (ret) |
|
goto err_nvm; |
|
|
|
nvm->major = val >> 16; |
|
nvm->minor = val >> 8; |
|
|
|
ret = tb_nvm_add_active(nvm, nvm_size, tb_switch_nvm_read); |
|
if (ret) |
|
goto err_nvm; |
|
} |
|
|
|
if (!sw->no_nvm_upgrade) { |
|
ret = tb_nvm_add_non_active(nvm, NVM_MAX_SIZE, |
|
tb_switch_nvm_write); |
|
if (ret) |
|
goto err_nvm; |
|
} |
|
|
|
sw->nvm = nvm; |
|
return 0; |
|
|
|
err_nvm: |
|
tb_nvm_free(nvm); |
|
return ret; |
|
} |
|
|
|
static void tb_switch_nvm_remove(struct tb_switch *sw) |
|
{ |
|
struct tb_nvm *nvm; |
|
|
|
nvm = sw->nvm; |
|
sw->nvm = NULL; |
|
|
|
if (!nvm) |
|
return; |
|
|
|
/* Remove authentication status in case the switch is unplugged */ |
|
if (!nvm->authenticating) |
|
nvm_clear_auth_status(sw); |
|
|
|
tb_nvm_free(nvm); |
|
} |
|
|
|
/* port utility functions */ |
|
|
|
static const char *tb_port_type(const struct tb_regs_port_header *port) |
|
{ |
|
switch (port->type >> 16) { |
|
case 0: |
|
switch ((u8) port->type) { |
|
case 0: |
|
return "Inactive"; |
|
case 1: |
|
return "Port"; |
|
case 2: |
|
return "NHI"; |
|
default: |
|
return "unknown"; |
|
} |
|
case 0x2: |
|
return "Ethernet"; |
|
case 0x8: |
|
return "SATA"; |
|
case 0xe: |
|
return "DP/HDMI"; |
|
case 0x10: |
|
return "PCIe"; |
|
case 0x20: |
|
return "USB"; |
|
default: |
|
return "unknown"; |
|
} |
|
} |
|
|
|
static void tb_dump_port(struct tb *tb, const struct tb_port *port) |
|
{ |
|
const struct tb_regs_port_header *regs = &port->config; |
|
|
|
tb_dbg(tb, |
|
" Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n", |
|
regs->port_number, regs->vendor_id, regs->device_id, |
|
regs->revision, regs->thunderbolt_version, tb_port_type(regs), |
|
regs->type); |
|
tb_dbg(tb, " Max hop id (in/out): %d/%d\n", |
|
regs->max_in_hop_id, regs->max_out_hop_id); |
|
tb_dbg(tb, " Max counters: %d\n", regs->max_counters); |
|
tb_dbg(tb, " NFC Credits: %#x\n", regs->nfc_credits); |
|
tb_dbg(tb, " Credits (total/control): %u/%u\n", port->total_credits, |
|
port->ctl_credits); |
|
} |
|
|
|
/** |
|
* tb_port_state() - get connectedness state of a port |
|
* @port: the port to check |
|
* |
|
* The port must have a TB_CAP_PHY (i.e. it should be a real port). |
|
* |
|
* Return: Returns an enum tb_port_state on success or an error code on failure. |
|
*/ |
|
int tb_port_state(struct tb_port *port) |
|
{ |
|
struct tb_cap_phy phy; |
|
int res; |
|
if (port->cap_phy == 0) { |
|
tb_port_WARN(port, "does not have a PHY\n"); |
|
return -EINVAL; |
|
} |
|
res = tb_port_read(port, &phy, TB_CFG_PORT, port->cap_phy, 2); |
|
if (res) |
|
return res; |
|
return phy.state; |
|
} |
|
|
|
/** |
|
* tb_wait_for_port() - wait for a port to become ready |
|
* @port: Port to wait |
|
* @wait_if_unplugged: Wait also when port is unplugged |
|
* |
|
* Wait up to 1 second for a port to reach state TB_PORT_UP. If |
|
* wait_if_unplugged is set then we also wait if the port is in state |
|
* TB_PORT_UNPLUGGED (it takes a while for the device to be registered after |
|
* switch resume). Otherwise we only wait if a device is registered but the link |
|
* has not yet been established. |
|
* |
|
* Return: Returns an error code on failure. Returns 0 if the port is not |
|
* connected or failed to reach state TB_PORT_UP within one second. Returns 1 |
|
* if the port is connected and in state TB_PORT_UP. |
|
*/ |
|
int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged) |
|
{ |
|
int retries = 10; |
|
int state; |
|
if (!port->cap_phy) { |
|
tb_port_WARN(port, "does not have PHY\n"); |
|
return -EINVAL; |
|
} |
|
if (tb_is_upstream_port(port)) { |
|
tb_port_WARN(port, "is the upstream port\n"); |
|
return -EINVAL; |
|
} |
|
|
|
while (retries--) { |
|
state = tb_port_state(port); |
|
if (state < 0) |
|
return state; |
|
if (state == TB_PORT_DISABLED) { |
|
tb_port_dbg(port, "is disabled (state: 0)\n"); |
|
return 0; |
|
} |
|
if (state == TB_PORT_UNPLUGGED) { |
|
if (wait_if_unplugged) { |
|
/* used during resume */ |
|
tb_port_dbg(port, |
|
"is unplugged (state: 7), retrying...\n"); |
|
msleep(100); |
|
continue; |
|
} |
|
tb_port_dbg(port, "is unplugged (state: 7)\n"); |
|
return 0; |
|
} |
|
if (state == TB_PORT_UP) { |
|
tb_port_dbg(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_dbg(port, |
|
"is connected, link is not up (state: %d), retrying...\n", |
|
state); |
|
msleep(100); |
|
} |
|
tb_port_warn(port, |
|
"failed to reach state TB_PORT_UP. Ignoring port...\n"); |
|
return 0; |
|
} |
|
|
|
/** |
|
* tb_port_add_nfc_credits() - add/remove non flow controlled credits to port |
|
* @port: Port to add/remove NFC credits |
|
* @credits: Credits to add/remove |
|
* |
|
* Change the number of NFC credits allocated to @port by @credits. To remove |
|
* NFC credits pass a negative amount of credits. |
|
* |
|
* Return: Returns 0 on success or an error code on failure. |
|
*/ |
|
int tb_port_add_nfc_credits(struct tb_port *port, int credits) |
|
{ |
|
u32 nfc_credits; |
|
|
|
if (credits == 0 || port->sw->is_unplugged) |
|
return 0; |
|
|
|
/* |
|
* USB4 restricts programming NFC buffers to lane adapters only |
|
* so skip other ports. |
|
*/ |
|
if (tb_switch_is_usb4(port->sw) && !tb_port_is_null(port)) |
|
return 0; |
|
|
|
nfc_credits = port->config.nfc_credits & ADP_CS_4_NFC_BUFFERS_MASK; |
|
nfc_credits += credits; |
|
|
|
tb_port_dbg(port, "adding %d NFC credits to %lu", credits, |
|
port->config.nfc_credits & ADP_CS_4_NFC_BUFFERS_MASK); |
|
|
|
port->config.nfc_credits &= ~ADP_CS_4_NFC_BUFFERS_MASK; |
|
port->config.nfc_credits |= nfc_credits; |
|
|
|
return tb_port_write(port, &port->config.nfc_credits, |
|
TB_CFG_PORT, ADP_CS_4, 1); |
|
} |
|
|
|
/** |
|
* tb_port_clear_counter() - clear a counter in TB_CFG_COUNTER |
|
* @port: Port whose counters to clear |
|
* @counter: Counter index to clear |
|
* |
|
* Return: Returns 0 on success or an error code on failure. |
|
*/ |
|
int tb_port_clear_counter(struct tb_port *port, int counter) |
|
{ |
|
u32 zero[3] = { 0, 0, 0 }; |
|
tb_port_dbg(port, "clearing counter %d\n", counter); |
|
return tb_port_write(port, zero, TB_CFG_COUNTERS, 3 * counter, 3); |
|
} |
|
|
|
/** |
|
* tb_port_unlock() - Unlock downstream port |
|
* @port: Port to unlock |
|
* |
|
* Needed for USB4 but can be called for any CIO/USB4 ports. Makes the |
|
* downstream router accessible for CM. |
|
*/ |
|
int tb_port_unlock(struct tb_port *port) |
|
{ |
|
if (tb_switch_is_icm(port->sw)) |
|
return 0; |
|
if (!tb_port_is_null(port)) |
|
return -EINVAL; |
|
if (tb_switch_is_usb4(port->sw)) |
|
return usb4_port_unlock(port); |
|
return 0; |
|
} |
|
|
|
static int __tb_port_enable(struct tb_port *port, bool enable) |
|
{ |
|
int ret; |
|
u32 phy; |
|
|
|
if (!tb_port_is_null(port)) |
|
return -EINVAL; |
|
|
|
ret = tb_port_read(port, &phy, TB_CFG_PORT, |
|
port->cap_phy + LANE_ADP_CS_1, 1); |
|
if (ret) |
|
return ret; |
|
|
|
if (enable) |
|
phy &= ~LANE_ADP_CS_1_LD; |
|
else |
|
phy |= LANE_ADP_CS_1_LD; |
|
|
|
return tb_port_write(port, &phy, TB_CFG_PORT, |
|
port->cap_phy + LANE_ADP_CS_1, 1); |
|
} |
|
|
|
/** |
|
* tb_port_enable() - Enable lane adapter |
|
* @port: Port to enable (can be %NULL) |
|
* |
|
* This is used for lane 0 and 1 adapters to enable it. |
|
*/ |
|
int tb_port_enable(struct tb_port *port) |
|
{ |
|
return __tb_port_enable(port, true); |
|
} |
|
|
|
/** |
|
* tb_port_disable() - Disable lane adapter |
|
* @port: Port to disable (can be %NULL) |
|
* |
|
* This is used for lane 0 and 1 adapters to disable it. |
|
*/ |
|
int tb_port_disable(struct tb_port *port) |
|
{ |
|
return __tb_port_enable(port, false); |
|
} |
|
|
|
/* |
|
* tb_init_port() - initialize a port |
|
* |
|
* This is a helper method for tb_switch_alloc. Does not check or initialize |
|
* any downstream switches. |
|
* |
|
* Return: Returns 0 on success or an error code on failure. |
|
*/ |
|
static int tb_init_port(struct tb_port *port) |
|
{ |
|
int res; |
|
int cap; |
|
|
|
INIT_LIST_HEAD(&port->list); |
|
|
|
/* Control adapter does not have configuration space */ |
|
if (!port->port) |
|
return 0; |
|
|
|
res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8); |
|
if (res) { |
|
if (res == -ENODEV) { |
|
tb_dbg(port->sw->tb, " Port %d: not implemented\n", |
|
port->port); |
|
port->disabled = true; |
|
return 0; |
|
} |
|
return res; |
|
} |
|
|
|
/* Port 0 is the switch itself and has no PHY. */ |
|
if (port->config.type == TB_TYPE_PORT) { |
|
cap = tb_port_find_cap(port, TB_PORT_CAP_PHY); |
|
|
|
if (cap > 0) |
|
port->cap_phy = cap; |
|
else |
|
tb_port_WARN(port, "non switch port without a PHY\n"); |
|
|
|
cap = tb_port_find_cap(port, TB_PORT_CAP_USB4); |
|
if (cap > 0) |
|
port->cap_usb4 = cap; |
|
|
|
/* |
|
* USB4 ports the buffers allocated for the control path |
|
* can be read from the path config space. Legacy |
|
* devices we use hard-coded value. |
|
*/ |
|
if (tb_switch_is_usb4(port->sw)) { |
|
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_simple_get(ida, min_hopid, max_hopid + 1, 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_simple_remove(&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_simple_remove(&port->out_hopids, hopid); |
|
} |
|
|
|
static inline bool tb_switch_is_reachable(const struct tb_switch *parent, |
|
const struct tb_switch *sw) |
|
{ |
|
u64 mask = (1ULL << parent->config.depth * 8) - 1; |
|
return (tb_route(parent) & mask) == (tb_route(sw) & mask); |
|
} |
|
|
|
/** |
|
* tb_next_port_on_path() - Return next port for given port on a path |
|
* @start: Start port of the walk |
|
* @end: End port of the walk |
|
* @prev: Previous port (%NULL if this is the first) |
|
* |
|
* This function can be used to walk from one port to another if they |
|
* are connected through zero or more switches. If the @prev is dual |
|
* link port, the function follows that link and returns another end on |
|
* that same link. |
|
* |
|
* If the @end port has been reached, return %NULL. |
|
* |
|
* Domain tb->lock must be held when this function is called. |
|
*/ |
|
struct tb_port *tb_next_port_on_path(struct tb_port *start, struct tb_port *end, |
|
struct tb_port *prev) |
|
{ |
|
struct tb_port *next; |
|
|
|
if (!prev) |
|
return start; |
|
|
|
if (prev->sw == end->sw) { |
|
if (prev == end) |
|
return NULL; |
|
return end; |
|
} |
|
|
|
if (tb_switch_is_reachable(prev->sw, end->sw)) { |
|
next = tb_port_at(tb_route(end->sw), prev->sw); |
|
/* Walk down the topology if next == prev */ |
|
if (prev->remote && |
|
(next == prev || next->dual_link_port == prev)) |
|
next = prev->remote; |
|
} else { |
|
if (tb_is_upstream_port(prev)) { |
|
next = prev->remote; |
|
} else { |
|
next = tb_upstream_port(prev->sw); |
|
/* |
|
* Keep the same link if prev and next are both |
|
* dual link ports. |
|
*/ |
|
if (next->dual_link_port && |
|
next->link_nr != prev->link_nr) { |
|
next = next->dual_link_port; |
|
} |
|
} |
|
} |
|
|
|
return next != prev ? next : NULL; |
|
} |
|
|
|
/** |
|
* tb_port_get_link_speed() - Get current link speed |
|
* @port: Port to check (USB4 or CIO) |
|
* |
|
* Returns link speed in Gb/s or negative errno in case of failure. |
|
*/ |
|
int tb_port_get_link_speed(struct tb_port *port) |
|
{ |
|
u32 val, speed; |
|
int ret; |
|
|
|
if (!port->cap_phy) |
|
return -EINVAL; |
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT, |
|
port->cap_phy + LANE_ADP_CS_1, 1); |
|
if (ret) |
|
return ret; |
|
|
|
speed = (val & LANE_ADP_CS_1_CURRENT_SPEED_MASK) >> |
|
LANE_ADP_CS_1_CURRENT_SPEED_SHIFT; |
|
return speed == LANE_ADP_CS_1_CURRENT_SPEED_GEN3 ? 20 : 10; |
|
} |
|
|
|
/** |
|
* tb_port_get_link_width() - Get current link width |
|
* @port: Port to check (USB4 or CIO) |
|
* |
|
* Returns link width. Return values can be 1 (Single-Lane), 2 (Dual-Lane) |
|
* 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; |
|
|
|
return (val & LANE_ADP_CS_1_CURRENT_WIDTH_MASK) >> |
|
LANE_ADP_CS_1_CURRENT_WIDTH_SHIFT; |
|
} |
|
|
|
static bool tb_port_is_width_supported(struct tb_port *port, int width) |
|
{ |
|
u32 phy, widths; |
|
int ret; |
|
|
|
if (!port->cap_phy) |
|
return false; |
|
|
|
ret = tb_port_read(port, &phy, TB_CFG_PORT, |
|
port->cap_phy + LANE_ADP_CS_0, 1); |
|
if (ret) |
|
return false; |
|
|
|
widths = (phy & LANE_ADP_CS_0_SUPPORTED_WIDTH_MASK) >> |
|
LANE_ADP_CS_0_SUPPORTED_WIDTH_SHIFT; |
|
|
|
return !!(widths & width); |
|
} |
|
|
|
static int tb_port_set_link_width(struct tb_port *port, unsigned int 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 1: |
|
val |= LANE_ADP_CS_1_TARGET_WIDTH_SINGLE << |
|
LANE_ADP_CS_1_TARGET_WIDTH_SHIFT; |
|
break; |
|
case 2: |
|
val |= LANE_ADP_CS_1_TARGET_WIDTH_DUAL << |
|
LANE_ADP_CS_1_TARGET_WIDTH_SHIFT; |
|
break; |
|
default: |
|
return -EINVAL; |
|
} |
|
|
|
val |= LANE_ADP_CS_1_LB; |
|
|
|
return tb_port_write(port, &val, TB_CFG_PORT, |
|
port->cap_phy + LANE_ADP_CS_1, 1); |
|
} |
|
|
|
/** |
|
* tb_port_lane_bonding_enable() - Enable bonding on port |
|
* @port: port to enable |
|
* |
|
* Enable bonding by setting the link width of the port and the other |
|
* port in case of dual link port. Does not wait for the link to |
|
* actually reach the bonded state so caller needs to call |
|
* tb_port_wait_for_link_width() before enabling any paths through the |
|
* link to make sure the link is in expected state. |
|
* |
|
* Return: %0 in case of success and negative errno in case of error |
|
*/ |
|
int tb_port_lane_bonding_enable(struct tb_port *port) |
|
{ |
|
int ret; |
|
|
|
/* |
|
* Enable lane bonding for both links if not already enabled by |
|
* for example the boot firmware. |
|
*/ |
|
ret = tb_port_get_link_width(port); |
|
if (ret == 1) { |
|
ret = tb_port_set_link_width(port, 2); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
ret = tb_port_get_link_width(port->dual_link_port); |
|
if (ret == 1) { |
|
ret = tb_port_set_link_width(port->dual_link_port, 2); |
|
if (ret) { |
|
tb_port_set_link_width(port, 1); |
|
return ret; |
|
} |
|
} |
|
|
|
port->bonded = true; |
|
port->dual_link_port->bonded = true; |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* 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) |
|
{ |
|
port->dual_link_port->bonded = false; |
|
port->bonded = false; |
|
|
|
tb_port_set_link_width(port->dual_link_port, 1); |
|
tb_port_set_link_width(port, 1); |
|
} |
|
|
|
/** |
|
* tb_port_wait_for_link_width() - Wait until link reaches specific width |
|
* @port: Port to wait for |
|
* @width: Expected link width (%1 or %2) |
|
* @timeout_msec: Timeout in ms how long to wait |
|
* |
|
* Should be used after both ends of the link have been bonded (or |
|
* bonding has been disabled) to wait until the link actually reaches |
|
* the expected state. Returns %-ETIMEDOUT if the @width was not reached |
|
* within the given timeout, %0 if it did. |
|
*/ |
|
int tb_port_wait_for_link_width(struct tb_port *port, int width, |
|
int timeout_msec) |
|
{ |
|
ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec); |
|
int ret; |
|
|
|
do { |
|
ret = tb_port_get_link_width(port); |
|
if (ret < 0) |
|
return ret; |
|
else if (ret == width) |
|
return 0; |
|
|
|
usleep_range(1000, 2000); |
|
} while (ktime_before(ktime_get(), timeout)); |
|
|
|
return -ETIMEDOUT; |
|
} |
|
|
|
static int tb_port_do_update_credits(struct tb_port *port) |
|
{ |
|
u32 nfc_credits; |
|
int ret; |
|
|
|
ret = tb_port_read(port, &nfc_credits, TB_CFG_PORT, ADP_CS_4, 1); |
|
if (ret) |
|
return ret; |
|
|
|
if (nfc_credits != port->config.nfc_credits) { |
|
u32 total; |
|
|
|
total = (nfc_credits & ADP_CS_4_TOTAL_BUFFERS_MASK) >> |
|
ADP_CS_4_TOTAL_BUFFERS_SHIFT; |
|
|
|
tb_port_dbg(port, "total credits changed %u -> %u\n", |
|
port->total_credits, total); |
|
|
|
port->config.nfc_credits = nfc_credits; |
|
port->total_credits = total; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* tb_port_update_credits() - Re-read port total credits |
|
* @port: Port to update |
|
* |
|
* After the link is bonded (or bonding was disabled) the port total |
|
* credits may change, so this function needs to be called to re-read |
|
* the credits. Updates also the second lane adapter. |
|
*/ |
|
int tb_port_update_credits(struct tb_port *port) |
|
{ |
|
int ret; |
|
|
|
ret = tb_port_do_update_credits(port); |
|
if (ret) |
|
return ret; |
|
return tb_port_do_update_credits(port->dual_link_port); |
|
} |
|
|
|
static int tb_port_start_lane_initialization(struct tb_port *port) |
|
{ |
|
int ret; |
|
|
|
if (tb_switch_is_usb4(port->sw)) |
|
return 0; |
|
|
|
ret = tb_lc_start_lane_initialization(port); |
|
return ret == -EINVAL ? 0 : ret; |
|
} |
|
|
|
/* |
|
* Returns true if the port had something (router, XDomain) connected |
|
* before suspend. |
|
*/ |
|
static bool tb_port_resume(struct tb_port *port) |
|
{ |
|
bool has_remote = tb_port_has_remote(port); |
|
|
|
if (port->usb4) { |
|
usb4_port_device_resume(port->usb4); |
|
} else if (!has_remote) { |
|
/* |
|
* For disconnected downstream lane adapters start lane |
|
* initialization now so we detect future connects. |
|
* |
|
* For XDomain start the lane initialzation now so the |
|
* link gets re-established. |
|
* |
|
* This is only needed for non-USB4 ports. |
|
*/ |
|
if (!tb_is_upstream_port(port) || port->xdomain) |
|
tb_port_start_lane_initialization(port); |
|
} |
|
|
|
return has_remote || port->xdomain; |
|
} |
|
|
|
/** |
|
* tb_port_is_enabled() - Is the adapter port enabled |
|
* @port: Port to check |
|
*/ |
|
bool tb_port_is_enabled(struct tb_port *port) |
|
{ |
|
switch (port->config.type) { |
|
case TB_TYPE_PCIE_UP: |
|
case TB_TYPE_PCIE_DOWN: |
|
return tb_pci_port_is_enabled(port); |
|
|
|
case TB_TYPE_DP_HDMI_IN: |
|
case TB_TYPE_DP_HDMI_OUT: |
|
return tb_dp_port_is_enabled(port); |
|
|
|
case TB_TYPE_USB3_UP: |
|
case TB_TYPE_USB3_DOWN: |
|
return tb_usb3_port_is_enabled(port); |
|
|
|
default: |
|
return false; |
|
} |
|
} |
|
|
|
/** |
|
* tb_usb3_port_is_enabled() - Is the USB3 adapter port enabled |
|
* @port: USB3 adapter port to check |
|
*/ |
|
bool tb_usb3_port_is_enabled(struct tb_port *port) |
|
{ |
|
u32 data; |
|
|
|
if (tb_port_read(port, &data, TB_CFG_PORT, |
|
port->cap_adap + ADP_USB3_CS_0, 1)) |
|
return false; |
|
|
|
return !!(data & ADP_USB3_CS_0_PE); |
|
} |
|
|
|
/** |
|
* tb_usb3_port_enable() - Enable USB3 adapter port |
|
* @port: USB3 adapter port to enable |
|
* @enable: Enable/disable the USB3 adapter |
|
*/ |
|
int tb_usb3_port_enable(struct tb_port *port, bool enable) |
|
{ |
|
u32 word = enable ? (ADP_USB3_CS_0_PE | ADP_USB3_CS_0_V) |
|
: ADP_USB3_CS_0_V; |
|
|
|
if (!port->cap_adap) |
|
return -ENXIO; |
|
return tb_port_write(port, &word, TB_CFG_PORT, |
|
port->cap_adap + ADP_USB3_CS_0, 1); |
|
} |
|
|
|
/** |
|
* tb_pci_port_is_enabled() - Is the PCIe adapter port enabled |
|
* @port: PCIe port to check |
|
*/ |
|
bool tb_pci_port_is_enabled(struct tb_port *port) |
|
{ |
|
u32 data; |
|
|
|
if (tb_port_read(port, &data, TB_CFG_PORT, |
|
port->cap_adap + ADP_PCIE_CS_0, 1)) |
|
return false; |
|
|
|
return !!(data & ADP_PCIE_CS_0_PE); |
|
} |
|
|
|
/** |
|
* tb_pci_port_enable() - Enable PCIe adapter port |
|
* @port: PCIe port to enable |
|
* @enable: Enable/disable the PCIe adapter |
|
*/ |
|
int tb_pci_port_enable(struct tb_port *port, bool enable) |
|
{ |
|
u32 word = enable ? ADP_PCIE_CS_0_PE : 0x0; |
|
if (!port->cap_adap) |
|
return -ENXIO; |
|
return tb_port_write(port, &word, TB_CFG_PORT, |
|
port->cap_adap + ADP_PCIE_CS_0, 1); |
|
} |
|
|
|
/** |
|
* tb_dp_port_hpd_is_active() - Is HPD already active |
|
* @port: DP out port to check |
|
* |
|
* Checks if the DP OUT adapter port has HDP bit already set. |
|
*/ |
|
int tb_dp_port_hpd_is_active(struct tb_port *port) |
|
{ |
|
u32 data; |
|
int ret; |
|
|
|
ret = tb_port_read(port, &data, TB_CFG_PORT, |
|
port->cap_adap + ADP_DP_CS_2, 1); |
|
if (ret) |
|
return ret; |
|
|
|
return !!(data & ADP_DP_CS_2_HDP); |
|
} |
|
|
|
/** |
|
* tb_dp_port_hpd_clear() - Clear HPD from DP IN port |
|
* @port: Port to clear HPD |
|
* |
|
* If the DP IN port has HDP set, this function can be used to clear it. |
|
*/ |
|
int tb_dp_port_hpd_clear(struct tb_port *port) |
|
{ |
|
u32 data; |
|
int ret; |
|
|
|
ret = tb_port_read(port, &data, TB_CFG_PORT, |
|
port->cap_adap + ADP_DP_CS_3, 1); |
|
if (ret) |
|
return ret; |
|
|
|
data |= ADP_DP_CS_3_HDPC; |
|
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. |
|
*/ |
|
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; |
|
|
|
ret = tb_port_read(port, data, TB_CFG_PORT, |
|
port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data)); |
|
if (ret) |
|
return ret; |
|
|
|
data[0] &= ~ADP_DP_CS_0_VIDEO_HOPID_MASK; |
|
data[1] &= ~ADP_DP_CS_1_AUX_RX_HOPID_MASK; |
|
data[1] &= ~ADP_DP_CS_1_AUX_RX_HOPID_MASK; |
|
|
|
data[0] |= (video << ADP_DP_CS_0_VIDEO_HOPID_SHIFT) & |
|
ADP_DP_CS_0_VIDEO_HOPID_MASK; |
|
data[1] |= aux_tx & ADP_DP_CS_1_AUX_TX_HOPID_MASK; |
|
data[1] |= (aux_rx << ADP_DP_CS_1_AUX_RX_HOPID_SHIFT) & |
|
ADP_DP_CS_1_AUX_RX_HOPID_MASK; |
|
|
|
return tb_port_write(port, data, TB_CFG_PORT, |
|
port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data)); |
|
} |
|
|
|
/** |
|
* tb_dp_port_is_enabled() - Is DP adapter port enabled |
|
* @port: DP adapter port to check |
|
*/ |
|
bool tb_dp_port_is_enabled(struct tb_port *port) |
|
{ |
|
u32 data[2]; |
|
|
|
if (tb_port_read(port, data, TB_CFG_PORT, port->cap_adap + ADP_DP_CS_0, |
|
ARRAY_SIZE(data))) |
|
return false; |
|
|
|
return !!(data[0] & (ADP_DP_CS_0_VE | ADP_DP_CS_0_AE)); |
|
} |
|
|
|
/** |
|
* tb_dp_port_enable() - Enables/disables DP paths of a port |
|
* @port: DP IN/OUT port |
|
* @enable: Enable/disable DP path |
|
* |
|
* Once Hop IDs are programmed DP paths can be enabled or disabled by |
|
* calling this function. |
|
*/ |
|
int tb_dp_port_enable(struct tb_port *port, bool enable) |
|
{ |
|
u32 data[2]; |
|
int ret; |
|
|
|
ret = tb_port_read(port, data, TB_CFG_PORT, |
|
port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data)); |
|
if (ret) |
|
return ret; |
|
|
|
if (enable) |
|
data[0] |= ADP_DP_CS_0_VE | ADP_DP_CS_0_AE; |
|
else |
|
data[0] &= ~(ADP_DP_CS_0_VE | ADP_DP_CS_0_AE); |
|
|
|
return tb_port_write(port, data, TB_CFG_PORT, |
|
port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data)); |
|
} |
|
|
|
/* switch utility functions */ |
|
|
|
static const char *tb_switch_generation_name(const struct tb_switch *sw) |
|
{ |
|
switch (sw->generation) { |
|
case 1: |
|
return "Thunderbolt 1"; |
|
case 2: |
|
return "Thunderbolt 2"; |
|
case 3: |
|
return "Thunderbolt 3"; |
|
case 4: |
|
return "USB4"; |
|
default: |
|
return "Unknown"; |
|
} |
|
} |
|
|
|
static void tb_dump_switch(const struct tb *tb, const struct tb_switch *sw) |
|
{ |
|
const struct tb_regs_switch_header *regs = &sw->config; |
|
|
|
tb_dbg(tb, " %s Switch: %x:%x (Revision: %d, TB Version: %d)\n", |
|
tb_switch_generation_name(sw), regs->vendor_id, regs->device_id, |
|
regs->revision, regs->thunderbolt_version); |
|
tb_dbg(tb, " Max Port Number: %d\n", regs->max_port_number); |
|
tb_dbg(tb, " Config:\n"); |
|
tb_dbg(tb, |
|
" Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n", |
|
regs->upstream_port_number, regs->depth, |
|
(((u64) regs->route_hi) << 32) | regs->route_lo, |
|
regs->enabled, regs->plug_events_delay); |
|
tb_dbg(tb, " unknown1: %#x unknown4: %#x\n", |
|
regs->__unknown1, regs->__unknown4); |
|
} |
|
|
|
/** |
|
* tb_switch_reset() - reconfigure route, enable and send TB_CFG_PKG_RESET |
|
* @sw: Switch to reset |
|
* |
|
* Return: Returns 0 on success or an error code on failure. |
|
*/ |
|
int tb_switch_reset(struct tb_switch *sw) |
|
{ |
|
struct tb_cfg_result res; |
|
|
|
if (sw->generation > 1) |
|
return 0; |
|
|
|
tb_sw_dbg(sw, "resetting switch\n"); |
|
|
|
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; |
|
return res.err; |
|
} |
|
|
|
/* |
|
* tb_plug_events_active() - enable/disable plug events on a switch |
|
* |
|
* Also configures a sane plug_events_delay of 255ms. |
|
* |
|
* Return: Returns 0 on success or an error code on failure. |
|
*/ |
|
static int tb_plug_events_active(struct tb_switch *sw, bool active) |
|
{ |
|
u32 data; |
|
int res; |
|
|
|
if (tb_switch_is_icm(sw) || tb_switch_is_usb4(sw)) |
|
return 0; |
|
|
|
sw->config.plug_events_delay = 0xff; |
|
res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1); |
|
if (res) |
|
return res; |
|
|
|
res = tb_sw_read(sw, &data, TB_CFG_SWITCH, sw->cap_plug_events + 1, 1); |
|
if (res) |
|
return res; |
|
|
|
if (active) { |
|
data = data & 0xFFFFFF83; |
|
switch (sw->config.device_id) { |
|
case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE: |
|
case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE: |
|
case PCI_DEVICE_ID_INTEL_PORT_RIDGE: |
|
break; |
|
default: |
|
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 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 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 |
|
generation_show(struct device *dev, struct device_attribute *attr, char *buf) |
|
{ |
|
struct tb_switch *sw = tb_to_switch(dev); |
|
|
|
return sprintf(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 = sprintf(buf, "%*phN\n", TB_SWITCH_KEY_SIZE, sw->key); |
|
else |
|
ret = sprintf(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 sprintf(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 lanes_show(struct device *dev, struct device_attribute *attr, |
|
char *buf) |
|
{ |
|
struct tb_switch *sw = tb_to_switch(dev); |
|
|
|
return sprintf(buf, "%u\n", sw->link_width); |
|
} |
|
|
|
/* |
|
* Currently link has same amount of lanes both directions (1 or 2) but |
|
* expose them separately to allow possible asymmetric links in the future. |
|
*/ |
|
static DEVICE_ATTR(rx_lanes, 0444, lanes_show, NULL); |
|
static DEVICE_ATTR(tx_lanes, 0444, 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 sprintf(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 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 = sprintf(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 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_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(struct device *dev, struct kobj_uevent_env *env) |
|
{ |
|
struct tb_switch *sw = tb_to_switch(dev); |
|
const char *type; |
|
|
|
if (sw->config.thunderbolt_version == USB4_VERSION_1_0) { |
|
if (add_uevent_var(env, "USB4_VERSION=1.0")) |
|
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) |
|
}; |
|
|
|
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) |
|
{ |
|
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; |
|
|
|
default: |
|
if (tb_switch_is_usb4(sw)) |
|
return 4; |
|
|
|
/* |
|
* For unknown switches assume generation to be 1 to be |
|
* on the safe side. |
|
*/ |
|
tb_sw_warn(sw, "unsupported switch device id %#x\n", |
|
sw->config.device_id); |
|
return 1; |
|
} |
|
} |
|
|
|
static bool tb_switch_exceeds_max_depth(const struct tb_switch *sw, int depth) |
|
{ |
|
int max_depth; |
|
|
|
if (tb_switch_is_usb4(sw) || |
|
(sw->tb->root_switch && tb_switch_is_usb4(sw->tb->root_switch))) |
|
max_depth = USB4_SWITCH_MAX_DEPTH; |
|
else |
|
max_depth = TB_SWITCH_MAX_DEPTH; |
|
|
|
return depth > max_depth; |
|
} |
|
|
|
/** |
|
* tb_switch_alloc() - allocate a switch |
|
* @tb: Pointer to the owning domain |
|
* @parent: Parent device for this switch |
|
* @route: Route string for this switch |
|
* |
|
* Allocates and initializes a switch. Will not upload configuration to |
|
* the switch. For that you need to call tb_switch_configure() |
|
* separately. The returned switch should be released by calling |
|
* tb_switch_put(). |
|
* |
|
* Return: Pointer to the allocated switch or ERR_PTR() in case of |
|
* failure. |
|
*/ |
|
struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent, |
|
u64 route) |
|
{ |
|
struct tb_switch *sw; |
|
int upstream_port; |
|
int i, ret, depth; |
|
|
|
/* Unlock the downstream port so we can access the switch below */ |
|
if (route) { |
|
struct tb_switch *parent_sw = tb_to_switch(parent); |
|
struct tb_port *down; |
|
|
|
down = tb_port_at(route, parent_sw); |
|
tb_port_unlock(down); |
|
} |
|
|
|
depth = tb_route_length(route); |
|
|
|
upstream_port = tb_cfg_get_upstream_port(tb->ctl, route); |
|
if (upstream_port < 0) |
|
return ERR_PTR(upstream_port); |
|
|
|
sw = kzalloc(sizeof(*sw), GFP_KERNEL); |
|
if (!sw) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
sw->tb = tb; |
|
ret = tb_cfg_read(tb->ctl, &sw->config, route, 0, TB_CFG_SWITCH, 0, 5); |
|
if (ret) |
|
goto err_free_sw_ports; |
|
|
|
sw->generation = tb_switch_get_generation(sw); |
|
|
|
tb_dbg(tb, "current switch config:\n"); |
|
tb_dump_switch(tb, sw); |
|
|
|
/* configure switch */ |
|
sw->config.upstream_port_number = upstream_port; |
|
sw->config.depth = depth; |
|
sw->config.route_hi = upper_32_bits(route); |
|
sw->config.route_lo = lower_32_bits(route); |
|
sw->config.enabled = 0; |
|
|
|
/* Make sure we do not exceed maximum topology limit */ |
|
if (tb_switch_exceeds_max_depth(sw, depth)) { |
|
ret = -EADDRNOTAVAIL; |
|
goto err_free_sw_ports; |
|
} |
|
|
|
/* initialize ports */ |
|
sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports), |
|
GFP_KERNEL); |
|
if (!sw->ports) { |
|
ret = -ENOMEM; |
|
goto err_free_sw_ports; |
|
} |
|
|
|
for (i = 0; i <= sw->config.max_port_number; i++) { |
|
/* minimum setup for tb_find_cap and tb_drom_read to work */ |
|
sw->ports[i].sw = sw; |
|
sw->ports[i].port = i; |
|
|
|
/* Control port does not need HopID allocation */ |
|
if (i) { |
|
ida_init(&sw->ports[i].in_hopids); |
|
ida_init(&sw->ports[i].out_hopids); |
|
} |
|
} |
|
|
|
ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_PLUG_EVENTS); |
|
if (ret > 0) |
|
sw->cap_plug_events = ret; |
|
|
|
ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_LINK_CONTROLLER); |
|
if (ret > 0) |
|
sw->cap_lc = ret; |
|
|
|
/* Root switch is always authorized */ |
|
if (!route) |
|
sw->authorized = true; |
|
|
|
device_initialize(&sw->dev); |
|
sw->dev.parent = parent; |
|
sw->dev.bus = &tb_bus_type; |
|
sw->dev.type = &tb_switch_type; |
|
sw->dev.groups = switch_groups; |
|
dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw)); |
|
|
|
return sw; |
|
|
|
err_free_sw_ports: |
|
kfree(sw->ports); |
|
kfree(sw); |
|
|
|
return ERR_PTR(ret); |
|
} |
|
|
|
/** |
|
* tb_switch_alloc_safe_mode() - allocate a switch that is in safe mode |
|
* @tb: Pointer to the owning domain |
|
* @parent: Parent device for this switch |
|
* @route: Route string for this switch |
|
* |
|
* This creates a switch in safe mode. This means the switch pretty much |
|
* lacks all capabilities except DMA configuration port before it is |
|
* flashed with a valid NVM firmware. |
|
* |
|
* The returned switch must be released by calling tb_switch_put(). |
|
* |
|
* Return: Pointer to the allocated switch or ERR_PTR() in case of failure |
|
*/ |
|
struct tb_switch * |
|
tb_switch_alloc_safe_mode(struct tb *tb, struct device *parent, u64 route) |
|
{ |
|
struct tb_switch *sw; |
|
|
|
sw = kzalloc(sizeof(*sw), GFP_KERNEL); |
|
if (!sw) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
sw->tb = tb; |
|
sw->config.depth = tb_route_length(route); |
|
sw->config.route_hi = upper_32_bits(route); |
|
sw->config.route_lo = lower_32_bits(route); |
|
sw->safe_mode = true; |
|
|
|
device_initialize(&sw->dev); |
|
sw->dev.parent = parent; |
|
sw->dev.bus = &tb_bus_type; |
|
sw->dev.type = &tb_switch_type; |
|
sw->dev.groups = switch_groups; |
|
dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw)); |
|
|
|
return sw; |
|
} |
|
|
|
/** |
|
* tb_switch_configure() - Uploads configuration to the switch |
|
* @sw: Switch to configure |
|
* |
|
* Call this function before the switch is added to the system. It will |
|
* upload configuration to the switch and makes it available for the |
|
* connection manager to use. Can be called to the switch again after |
|
* resume from low power states to re-initialize it. |
|
* |
|
* Return: %0 in case of success and negative errno in case of failure |
|
*/ |
|
int tb_switch_configure(struct tb_switch *sw) |
|
{ |
|
struct tb *tb = sw->tb; |
|
u64 route; |
|
int ret; |
|
|
|
route = tb_route(sw); |
|
|
|
tb_dbg(tb, "%s Switch at %#llx (depth: %d, up port: %d)\n", |
|
sw->config.enabled ? "restoring" : "initializing", route, |
|
tb_route_length(route), sw->config.upstream_port_number); |
|
|
|
sw->config.enabled = 1; |
|
|
|
if (tb_switch_is_usb4(sw)) { |
|
/* |
|
* For USB4 devices, we need to program the CM version |
|
* accordingly so that it knows to expose all the |
|
* additional capabilities. |
|
*/ |
|
sw->config.cmuv = USB4_VERSION_1_0; |
|
|
|
/* Enumerate the switch */ |
|
ret = tb_sw_write(sw, (u32 *)&sw->config + 1, TB_CFG_SWITCH, |
|
ROUTER_CS_1, 4); |
|
if (ret) |
|
return ret; |
|
|
|
ret = usb4_switch_setup(sw); |
|
} else { |
|
if (sw->config.vendor_id != PCI_VENDOR_ID_INTEL) |
|
tb_sw_warn(sw, "unknown switch vendor id %#x\n", |
|
sw->config.vendor_id); |
|
|
|
if (!sw->cap_plug_events) { |
|
tb_sw_warn(sw, "cannot find TB_VSE_CAP_PLUG_EVENTS aborting\n"); |
|
return -ENODEV; |
|
} |
|
|
|
/* Enumerate the switch */ |
|
ret = tb_sw_write(sw, (u32 *)&sw->config + 1, TB_CFG_SWITCH, |
|
ROUTER_CS_1, 3); |
|
} |
|
if (ret) |
|
return ret; |
|
|
|
return tb_plug_events_active(sw, true); |
|
} |
|
|
|
static int tb_switch_set_uuid(struct tb_switch *sw) |
|
{ |
|
bool uid = false; |
|
u32 uuid[4]; |
|
int ret; |
|
|
|
if (sw->uuid) |
|
return 0; |
|
|
|
if (tb_switch_is_usb4(sw)) { |
|
ret = usb4_switch_read_uid(sw, &sw->uid); |
|
if (ret) |
|
return ret; |
|
uid = true; |
|
} else { |
|
/* |
|
* The newer controllers include fused UUID as part of |
|
* link controller specific registers |
|
*/ |
|
ret = tb_lc_read_uuid(sw, uuid); |
|
if (ret) { |
|
if (ret != -EINVAL) |
|
return ret; |
|
uid = true; |
|
} |
|
} |
|
|
|
if (uid) { |
|
/* |
|
* ICM generates UUID based on UID and fills the upper |
|
* two words with ones. This is not strictly following |
|
* UUID format but we want to be compatible with it so |
|
* we do the same here. |
|
*/ |
|
uuid[0] = sw->uid & 0xffffffff; |
|
uuid[1] = (sw->uid >> 32) & 0xffffffff; |
|
uuid[2] = 0xffffffff; |
|
uuid[3] = 0xffffffff; |
|
} |
|
|
|
sw->uuid = kmemdup(uuid, sizeof(uuid), GFP_KERNEL); |
|
if (!sw->uuid) |
|
return -ENOMEM; |
|
return 0; |
|
} |
|
|
|
static int tb_switch_add_dma_port(struct tb_switch *sw) |
|
{ |
|
u32 status; |
|
int ret; |
|
|
|
switch (sw->generation) { |
|
case 2: |
|
/* Only root switch can be upgraded */ |
|
if (tb_route(sw)) |
|
return 0; |
|
|
|
fallthrough; |
|
case 3: |
|
case 4: |
|
ret = tb_switch_set_uuid(sw); |
|
if (ret) |
|
return ret; |
|
break; |
|
|
|
default: |
|
/* |
|
* DMA port is the only thing available when the switch |
|
* is in safe mode. |
|
*/ |
|
if (!sw->safe_mode) |
|
return 0; |
|
break; |
|
} |
|
|
|
if (sw->no_nvm_upgrade) |
|
return 0; |
|
|
|
if (tb_switch_is_usb4(sw)) { |
|
ret = usb4_switch_nvm_authenticate_status(sw, &status); |
|
if (ret) |
|
return ret; |
|
|
|
if (status) { |
|
tb_sw_info(sw, "switch flash authentication failed\n"); |
|
nvm_set_auth_status(sw, status); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* Root switch DMA port requires running firmware */ |
|
if (!tb_route(sw) && !tb_switch_is_icm(sw)) |
|
return 0; |
|
|
|
sw->dma_port = dma_port_alloc(sw); |
|
if (!sw->dma_port) |
|
return 0; |
|
|
|
/* |
|
* If there is status already set then authentication failed |
|
* when the dma_port_flash_update_auth() returned. Power cycling |
|
* is not needed (it was done already) so only thing we do here |
|
* is to unblock runtime PM of the root port. |
|
*/ |
|
nvm_get_auth_status(sw, &status); |
|
if (status) { |
|
if (!tb_route(sw)) |
|
nvm_authenticate_complete_dma_port(sw); |
|
return 0; |
|
} |
|
|
|
/* |
|
* Check status of the previous flash authentication. If there |
|
* is one we need to power cycle the switch in any case to make |
|
* it functional again. |
|
*/ |
|
ret = dma_port_flash_update_auth_status(sw->dma_port, &status); |
|
if (ret <= 0) |
|
return ret; |
|
|
|
/* Now we can allow root port to suspend again */ |
|
if (!tb_route(sw)) |
|
nvm_authenticate_complete_dma_port(sw); |
|
|
|
if (status) { |
|
tb_sw_info(sw, "switch flash authentication failed\n"); |
|
nvm_set_auth_status(sw, status); |
|
} |
|
|
|
tb_sw_info(sw, "power cycling the switch now\n"); |
|
dma_port_power_cycle(sw->dma_port); |
|
|
|
/* |
|
* We return error here which causes the switch adding failure. |
|
* It should appear back after power cycle is complete. |
|
*/ |
|
return -ESHUTDOWN; |
|
} |
|
|
|
static void tb_switch_default_link_ports(struct tb_switch *sw) |
|
{ |
|
int i; |
|
|
|
for (i = 1; i <= sw->config.max_port_number; i++) { |
|
struct tb_port *port = &sw->ports[i]; |
|
struct tb_port *subordinate; |
|
|
|
if (!tb_port_is_null(port)) |
|
continue; |
|
|
|
/* Check for the subordinate port */ |
|
if (i == sw->config.max_port_number || |
|
!tb_port_is_null(&sw->ports[i + 1])) |
|
continue; |
|
|
|
/* Link them if not already done so (by DROM) */ |
|
subordinate = &sw->ports[i + 1]; |
|
if (!port->dual_link_port && !subordinate->dual_link_port) { |
|
port->link_nr = 0; |
|
port->dual_link_port = subordinate; |
|
subordinate->link_nr = 1; |
|
subordinate->dual_link_port = port; |
|
|
|
tb_sw_dbg(sw, "linked ports %d <-> %d\n", |
|
port->port, subordinate->port); |
|
} |
|
} |
|
} |
|
|
|
static bool tb_switch_lane_bonding_possible(struct tb_switch *sw) |
|
{ |
|
const struct tb_port *up = tb_upstream_port(sw); |
|
|
|
if (!up->dual_link_port || !up->dual_link_port->remote) |
|
return false; |
|
|
|
if (tb_switch_is_usb4(sw)) |
|
return usb4_switch_lane_bonding_possible(sw); |
|
return tb_lc_lane_bonding_possible(sw); |
|
} |
|
|
|
static int tb_switch_update_link_attributes(struct tb_switch *sw) |
|
{ |
|
struct tb_port *up; |
|
bool change = false; |
|
int ret; |
|
|
|
if (!tb_route(sw) || tb_switch_is_icm(sw)) |
|
return 0; |
|
|
|
up = tb_upstream_port(sw); |
|
|
|
ret = tb_port_get_link_speed(up); |
|
if (ret < 0) |
|
return ret; |
|
if (sw->link_speed != ret) |
|
change = true; |
|
sw->link_speed = ret; |
|
|
|
ret = tb_port_get_link_width(up); |
|
if (ret < 0) |
|
return ret; |
|
if (sw->link_width != ret) |
|
change = true; |
|
sw->link_width = ret; |
|
|
|
/* Notify userspace that there is possible link attribute change */ |
|
if (device_is_registered(&sw->dev) && change) |
|
kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* 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. |
|
*/ |
|
int tb_switch_lane_bonding_enable(struct tb_switch *sw) |
|
{ |
|
struct tb_switch *parent = tb_to_switch(sw->dev.parent); |
|
struct tb_port *up, *down; |
|
u64 route = tb_route(sw); |
|
int ret; |
|
|
|
if (!route) |
|
return 0; |
|
|
|
if (!tb_switch_lane_bonding_possible(sw)) |
|
return 0; |
|
|
|
up = tb_upstream_port(sw); |
|
down = tb_port_at(route, parent); |
|
|
|
if (!tb_port_is_width_supported(up, 2) || |
|
!tb_port_is_width_supported(down, 2)) |
|
return 0; |
|
|
|
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; |
|
} |
|
|
|
ret = tb_port_wait_for_link_width(down, 2, 100); |
|
if (ret) { |
|
tb_port_warn(down, "timeout enabling lane bonding\n"); |
|
return ret; |
|
} |
|
|
|
tb_port_update_credits(down); |
|
tb_port_update_credits(up); |
|
tb_switch_update_link_attributes(sw); |
|
|
|
tb_sw_dbg(sw, "lane bonding enabled\n"); |
|
return ret; |
|
} |
|
|
|
/** |
|
* 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. |
|
*/ |
|
void tb_switch_lane_bonding_disable(struct tb_switch *sw) |
|
{ |
|
struct tb_switch *parent = tb_to_switch(sw->dev.parent); |
|
struct tb_port *up, *down; |
|
|
|
if (!tb_route(sw)) |
|
return; |
|
|
|
up = tb_upstream_port(sw); |
|
if (!up->bonded) |
|
return; |
|
|
|
down = tb_port_at(tb_route(sw), parent); |
|
|
|
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. |
|
*/ |
|
if (tb_port_wait_for_link_width(down, 1, 100) == -ETIMEDOUT) |
|
tb_sw_warn(sw, "timeout disabling lane bonding\n"); |
|
|
|
tb_port_update_credits(down); |
|
tb_port_update_credits(up); |
|
tb_switch_update_link_attributes(sw); |
|
|
|
tb_sw_dbg(sw, "lane bonding disabled\n"); |
|
} |
|
|
|
/** |
|
* tb_switch_configure_link() - Set link configured |
|
* @sw: Switch whose link is configured |
|
* |
|
* Sets the link upstream from @sw configured (from both ends) so that |
|
* it will not be disconnected when the domain exits sleep. Can be |
|
* called for any switch. |
|
* |
|
* It is recommended that this is called after lane bonding is enabled. |
|
* |
|
* Returns %0 on success and negative errno in case of error. |
|
*/ |
|
int tb_switch_configure_link(struct tb_switch *sw) |
|
{ |
|
struct tb_port *up, *down; |
|
int ret; |
|
|
|
if (!tb_route(sw) || tb_switch_is_icm(sw)) |
|
return 0; |
|
|
|
up = tb_upstream_port(sw); |
|
if (tb_switch_is_usb4(up->sw)) |
|
ret = usb4_port_configure(up); |
|
else |
|
ret = tb_lc_configure_port(up); |
|
if (ret) |
|
return ret; |
|
|
|
down = up->remote; |
|
if (tb_switch_is_usb4(down->sw)) |
|
return usb4_port_configure(down); |
|
return tb_lc_configure_port(down); |
|
} |
|
|
|
/** |
|
* tb_switch_unconfigure_link() - Unconfigure link |
|
* @sw: Switch whose link is unconfigured |
|
* |
|
* Sets the link unconfigured so the @sw will be disconnected if the |
|
* domain exists sleep. |
|
*/ |
|
void tb_switch_unconfigure_link(struct tb_switch *sw) |
|
{ |
|
struct tb_port *up, *down; |
|
|
|
if (sw->is_unplugged) |
|
return; |
|
if (!tb_route(sw) || tb_switch_is_icm(sw)) |
|
return; |
|
|
|
up = tb_upstream_port(sw); |
|
if (tb_switch_is_usb4(up->sw)) |
|
usb4_port_unconfigure(up); |
|
else |
|
tb_lc_unconfigure_port(up); |
|
|
|
down = up->remote; |
|
if (tb_switch_is_usb4(down->sw)) |
|
usb4_port_unconfigure(down); |
|
else |
|
tb_lc_unconfigure_port(down); |
|
} |
|
|
|
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"); |
|
} |
|
|
|
/** |
|
* 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) { |
|
dev_err(&sw->dev, "failed to add DMA port\n"); |
|
return ret; |
|
} |
|
|
|
if (!sw->safe_mode) { |
|
tb_switch_credits_init(sw); |
|
|
|
/* read drom */ |
|
ret = tb_drom_read(sw); |
|
if (ret) { |
|
dev_err(&sw->dev, "reading DROM failed\n"); |
|
return ret; |
|
} |
|
tb_sw_dbg(sw, "uid: %#llx\n", sw->uid); |
|
|
|
tb_check_quirks(sw); |
|
|
|
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_switch_default_link_ports(sw); |
|
|
|
ret = tb_switch_update_link_attributes(sw); |
|
if (ret) |
|
return ret; |
|
|
|
ret = tb_switch_tmu_init(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) { |
|
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) |
|
{ |
|
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); |
|
return tb_lc_set_wake(sw, flags); |
|
} |
|
|
|
int tb_switch_resume(struct tb_switch *sw) |
|
{ |
|
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; |
|
} |
|
|
|
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; |
|
|
|
/* Disable wakes */ |
|
tb_switch_set_wake(sw, 0); |
|
|
|
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)) { |
|
tb_port_warn(port, |
|
"lost during suspend, disconnecting\n"); |
|
tb_sw_set_unplugged(port->remote->sw); |
|
} |
|
} |
|
} |
|
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"); |
|
|
|
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_USB4 | TB_WAKE_ON_USB3 | TB_WAKE_ON_PCIE; |
|
} |
|
|
|
tb_switch_set_wake(sw, flags); |
|
|
|
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. Returns %true if resource is available. |
|
*/ |
|
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()). |
|
* Returns %0 in success and negative errno otherwise. |
|
*/ |
|
int tb_switch_alloc_dp_resource(struct tb_switch *sw, struct tb_port *in) |
|
{ |
|
if (tb_switch_is_usb4(sw)) |
|
return usb4_switch_alloc_dp_resource(sw, in); |
|
return tb_lc_dp_sink_alloc(sw, in); |
|
} |
|
|
|
/** |
|
* 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); |
|
} |
|
|
|
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. |
|
*/ |
|
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; |
|
} |
|
|
|
/** |
|
* 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 |
|
*/ |
|
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; |
|
}
|
|
|