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linux/drivers/thunderbolt/tunnel.c
Gil Fine 2a0ed2da17 thunderbolt: Fix kernel-doc for tb_tunnel_alloc_dp() 
In case of no bandwidth available for DP tunnel, the function get the arguments
@max_up and @max_down set to zero. Fix the kernel-doc to describe more
accurately the purpose of the function.

No functional changes.

Signed-off-by: Gil Fine <gil.fine@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
2024-04-27 08:03:56 +03:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Thunderbolt driver - Tunneling support
*
* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
* Copyright (C) 2019, Intel Corporation
*/
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/ktime.h>
#include <linux/string_helpers.h>
#include "tunnel.h"
#include "tb.h"
/* PCIe adapters use always HopID of 8 for both directions */
#define TB_PCI_HOPID 8
#define TB_PCI_PATH_DOWN 0
#define TB_PCI_PATH_UP 1
#define TB_PCI_PRIORITY 3
#define TB_PCI_WEIGHT 1
/* USB3 adapters use always HopID of 8 for both directions */
#define TB_USB3_HOPID 8
#define TB_USB3_PATH_DOWN 0
#define TB_USB3_PATH_UP 1
#define TB_USB3_PRIORITY 3
#define TB_USB3_WEIGHT 2
/* DP adapters use HopID 8 for AUX and 9 for Video */
#define TB_DP_AUX_TX_HOPID 8
#define TB_DP_AUX_RX_HOPID 8
#define TB_DP_VIDEO_HOPID 9
#define TB_DP_VIDEO_PATH_OUT 0
#define TB_DP_AUX_PATH_OUT 1
#define TB_DP_AUX_PATH_IN 2
#define TB_DP_VIDEO_PRIORITY 1
#define TB_DP_VIDEO_WEIGHT 1
#define TB_DP_AUX_PRIORITY 2
#define TB_DP_AUX_WEIGHT 1
/* Minimum number of credits needed for PCIe path */
#define TB_MIN_PCIE_CREDITS 6U
/*
* Number of credits we try to allocate for each DMA path if not limited
* by the host router baMaxHI.
*/
#define TB_DMA_CREDITS 14
/* Minimum number of credits for DMA path */
#define TB_MIN_DMA_CREDITS 1
#define TB_DMA_PRIORITY 5
#define TB_DMA_WEIGHT 1
/*
* Reserve additional bandwidth for USB 3.x and PCIe bulk traffic
* according to USB4 v2 Connection Manager guide. This ends up reserving
* 1500 Mb/s for PCIe and 3000 Mb/s for USB 3.x taking weights into
* account.
*/
#define USB4_V2_PCI_MIN_BANDWIDTH (1500 * TB_PCI_WEIGHT)
#define USB4_V2_USB3_MIN_BANDWIDTH (1500 * TB_USB3_WEIGHT)
static unsigned int dma_credits = TB_DMA_CREDITS;
module_param(dma_credits, uint, 0444);
MODULE_PARM_DESC(dma_credits, "specify custom credits for DMA tunnels (default: "
__MODULE_STRING(TB_DMA_CREDITS) ")");
static bool bw_alloc_mode = true;
module_param(bw_alloc_mode, bool, 0444);
MODULE_PARM_DESC(bw_alloc_mode,
"enable bandwidth allocation mode if supported (default: true)");
static const char * const tb_tunnel_names[] = { "PCI", "DP", "DMA", "USB3" };
static inline unsigned int tb_usable_credits(const struct tb_port *port)
{
return port->total_credits - port->ctl_credits;
}
/**
* tb_available_credits() - Available credits for PCIe and DMA
* @port: Lane adapter to check
* @max_dp_streams: If non-%NULL stores maximum number of simultaneous DP
* streams possible through this lane adapter
*/
static unsigned int tb_available_credits(const struct tb_port *port,
size_t *max_dp_streams)
{
const struct tb_switch *sw = port->sw;
int credits, usb3, pcie, spare;
size_t ndp;
usb3 = tb_acpi_may_tunnel_usb3() ? sw->max_usb3_credits : 0;
pcie = tb_acpi_may_tunnel_pcie() ? sw->max_pcie_credits : 0;
if (tb_acpi_is_xdomain_allowed()) {
spare = min_not_zero(sw->max_dma_credits, dma_credits);
/* Add some credits for potential second DMA tunnel */
spare += TB_MIN_DMA_CREDITS;
} else {
spare = 0;
}
credits = tb_usable_credits(port);
if (tb_acpi_may_tunnel_dp()) {
/*
* Maximum number of DP streams possible through the
* lane adapter.
*/
if (sw->min_dp_aux_credits + sw->min_dp_main_credits)
ndp = (credits - (usb3 + pcie + spare)) /
(sw->min_dp_aux_credits + sw->min_dp_main_credits);
else
ndp = 0;
} else {
ndp = 0;
}
credits -= ndp * (sw->min_dp_aux_credits + sw->min_dp_main_credits);
credits -= usb3;
if (max_dp_streams)
*max_dp_streams = ndp;
return credits > 0 ? credits : 0;
}
static void tb_init_pm_support(struct tb_path_hop *hop)
{
struct tb_port *out_port = hop->out_port;
struct tb_port *in_port = hop->in_port;
if (tb_port_is_null(in_port) && tb_port_is_null(out_port) &&
usb4_switch_version(in_port->sw) >= 2)
hop->pm_support = true;
}
static struct tb_tunnel *tb_tunnel_alloc(struct tb *tb, size_t npaths,
enum tb_tunnel_type type)
{
struct tb_tunnel *tunnel;
tunnel = kzalloc(sizeof(*tunnel), GFP_KERNEL);
if (!tunnel)
return NULL;
tunnel->paths = kcalloc(npaths, sizeof(tunnel->paths[0]), GFP_KERNEL);
if (!tunnel->paths) {
tb_tunnel_free(tunnel);
return NULL;
}
INIT_LIST_HEAD(&tunnel->list);
tunnel->tb = tb;
tunnel->npaths = npaths;
tunnel->type = type;
return tunnel;
}
static int tb_pci_set_ext_encapsulation(struct tb_tunnel *tunnel, bool enable)
{
struct tb_port *port = tb_upstream_port(tunnel->dst_port->sw);
int ret;
/* Only supported of both routers are at least USB4 v2 */
if ((usb4_switch_version(tunnel->src_port->sw) < 2) ||
(usb4_switch_version(tunnel->dst_port->sw) < 2))
return 0;
if (enable && tb_port_get_link_generation(port) < 4)
return 0;
ret = usb4_pci_port_set_ext_encapsulation(tunnel->src_port, enable);
if (ret)
return ret;
/*
* Downstream router could be unplugged so disable of encapsulation
* in upstream router is still possible.
*/
ret = usb4_pci_port_set_ext_encapsulation(tunnel->dst_port, enable);
if (ret) {
if (enable)
return ret;
if (ret != -ENODEV)
return ret;
}
tb_tunnel_dbg(tunnel, "extended encapsulation %s\n",
str_enabled_disabled(enable));
return 0;
}
static int tb_pci_activate(struct tb_tunnel *tunnel, bool activate)
{
int res;
if (activate) {
res = tb_pci_set_ext_encapsulation(tunnel, activate);
if (res)
return res;
}
if (activate)
res = tb_pci_port_enable(tunnel->dst_port, activate);
else
res = tb_pci_port_enable(tunnel->src_port, activate);
if (res)
return res;
if (activate) {
res = tb_pci_port_enable(tunnel->src_port, activate);
if (res)
return res;
} else {
/* Downstream router could be unplugged */
tb_pci_port_enable(tunnel->dst_port, activate);
}
return activate ? 0 : tb_pci_set_ext_encapsulation(tunnel, activate);
}
static int tb_pci_init_credits(struct tb_path_hop *hop)
{
struct tb_port *port = hop->in_port;
struct tb_switch *sw = port->sw;
unsigned int credits;
if (tb_port_use_credit_allocation(port)) {
unsigned int available;
available = tb_available_credits(port, NULL);
credits = min(sw->max_pcie_credits, available);
if (credits < TB_MIN_PCIE_CREDITS)
return -ENOSPC;
credits = max(TB_MIN_PCIE_CREDITS, credits);
} else {
if (tb_port_is_null(port))
credits = port->bonded ? 32 : 16;
else
credits = 7;
}
hop->initial_credits = credits;
return 0;
}
static int tb_pci_init_path(struct tb_path *path)
{
struct tb_path_hop *hop;
path->egress_fc_enable = TB_PATH_SOURCE | TB_PATH_INTERNAL;
path->egress_shared_buffer = TB_PATH_NONE;
path->ingress_fc_enable = TB_PATH_ALL;
path->ingress_shared_buffer = TB_PATH_NONE;
path->priority = TB_PCI_PRIORITY;
path->weight = TB_PCI_WEIGHT;
path->drop_packages = 0;
tb_path_for_each_hop(path, hop) {
int ret;
ret = tb_pci_init_credits(hop);
if (ret)
return ret;
}
return 0;
}
/**
* tb_tunnel_discover_pci() - Discover existing PCIe tunnels
* @tb: Pointer to the domain structure
* @down: PCIe downstream adapter
* @alloc_hopid: Allocate HopIDs from visited ports
*
* If @down adapter is active, follows the tunnel to the PCIe upstream
* adapter and back. Returns the discovered tunnel or %NULL if there was
* no tunnel.
*/
struct tb_tunnel *tb_tunnel_discover_pci(struct tb *tb, struct tb_port *down,
bool alloc_hopid)
{
struct tb_tunnel *tunnel;
struct tb_path *path;
if (!tb_pci_port_is_enabled(down))
return NULL;
tunnel = tb_tunnel_alloc(tb, 2, TB_TUNNEL_PCI);
if (!tunnel)
return NULL;
tunnel->activate = tb_pci_activate;
tunnel->src_port = down;
/*
* Discover both paths even if they are not complete. We will
* clean them up by calling tb_tunnel_deactivate() below in that
* case.
*/
path = tb_path_discover(down, TB_PCI_HOPID, NULL, -1,
&tunnel->dst_port, "PCIe Up", alloc_hopid);
if (!path) {
/* Just disable the downstream port */
tb_pci_port_enable(down, false);
goto err_free;
}
tunnel->paths[TB_PCI_PATH_UP] = path;
if (tb_pci_init_path(tunnel->paths[TB_PCI_PATH_UP]))
goto err_free;
path = tb_path_discover(tunnel->dst_port, -1, down, TB_PCI_HOPID, NULL,
"PCIe Down", alloc_hopid);
if (!path)
goto err_deactivate;
tunnel->paths[TB_PCI_PATH_DOWN] = path;
if (tb_pci_init_path(tunnel->paths[TB_PCI_PATH_DOWN]))
goto err_deactivate;
/* Validate that the tunnel is complete */
if (!tb_port_is_pcie_up(tunnel->dst_port)) {
tb_port_warn(tunnel->dst_port,
"path does not end on a PCIe adapter, cleaning up\n");
goto err_deactivate;
}
if (down != tunnel->src_port) {
tb_tunnel_warn(tunnel, "path is not complete, cleaning up\n");
goto err_deactivate;
}
if (!tb_pci_port_is_enabled(tunnel->dst_port)) {
tb_tunnel_warn(tunnel,
"tunnel is not fully activated, cleaning up\n");
goto err_deactivate;
}
tb_tunnel_dbg(tunnel, "discovered\n");
return tunnel;
err_deactivate:
tb_tunnel_deactivate(tunnel);
err_free:
tb_tunnel_free(tunnel);
return NULL;
}
/**
* tb_tunnel_alloc_pci() - allocate a pci tunnel
* @tb: Pointer to the domain structure
* @up: PCIe upstream adapter port
* @down: PCIe downstream adapter port
*
* Allocate a PCI tunnel. The ports must be of type TB_TYPE_PCIE_UP and
* TB_TYPE_PCIE_DOWN.
*
* Return: Returns a tb_tunnel on success or NULL on failure.
*/
struct tb_tunnel *tb_tunnel_alloc_pci(struct tb *tb, struct tb_port *up,
struct tb_port *down)
{
struct tb_tunnel *tunnel;
struct tb_path *path;
tunnel = tb_tunnel_alloc(tb, 2, TB_TUNNEL_PCI);
if (!tunnel)
return NULL;
tunnel->activate = tb_pci_activate;
tunnel->src_port = down;
tunnel->dst_port = up;
path = tb_path_alloc(tb, down, TB_PCI_HOPID, up, TB_PCI_HOPID, 0,
"PCIe Down");
if (!path)
goto err_free;
tunnel->paths[TB_PCI_PATH_DOWN] = path;
if (tb_pci_init_path(path))
goto err_free;
path = tb_path_alloc(tb, up, TB_PCI_HOPID, down, TB_PCI_HOPID, 0,
"PCIe Up");
if (!path)
goto err_free;
tunnel->paths[TB_PCI_PATH_UP] = path;
if (tb_pci_init_path(path))
goto err_free;
return tunnel;
err_free:
tb_tunnel_free(tunnel);
return NULL;
}
/**
* tb_tunnel_reserved_pci() - Amount of bandwidth to reserve for PCIe
* @port: Lane 0 adapter
* @reserved_up: Upstream bandwidth in Mb/s to reserve
* @reserved_down: Downstream bandwidth in Mb/s to reserve
*
* Can be called to any connected lane 0 adapter to find out how much
* bandwidth needs to be left in reserve for possible PCIe bulk traffic.
* Returns true if there is something to be reserved and writes the
* amount to @reserved_down/@reserved_up. Otherwise returns false and
* does not touch the parameters.
*/
bool tb_tunnel_reserved_pci(struct tb_port *port, int *reserved_up,
int *reserved_down)
{
if (WARN_ON_ONCE(!port->remote))
return false;
if (!tb_acpi_may_tunnel_pcie())
return false;
if (tb_port_get_link_generation(port) < 4)
return false;
/* Must have PCIe adapters */
if (tb_is_upstream_port(port)) {
if (!tb_switch_find_port(port->sw, TB_TYPE_PCIE_UP))
return false;
if (!tb_switch_find_port(port->remote->sw, TB_TYPE_PCIE_DOWN))
return false;
} else {
if (!tb_switch_find_port(port->sw, TB_TYPE_PCIE_DOWN))
return false;
if (!tb_switch_find_port(port->remote->sw, TB_TYPE_PCIE_UP))
return false;
}
*reserved_up = USB4_V2_PCI_MIN_BANDWIDTH;
*reserved_down = USB4_V2_PCI_MIN_BANDWIDTH;
tb_port_dbg(port, "reserving %u/%u Mb/s for PCIe\n", *reserved_up,
*reserved_down);
return true;
}
static bool tb_dp_is_usb4(const struct tb_switch *sw)
{
/* Titan Ridge DP adapters need the same treatment as USB4 */
return tb_switch_is_usb4(sw) || tb_switch_is_titan_ridge(sw);
}
static int tb_dp_cm_handshake(struct tb_port *in, struct tb_port *out,
int timeout_msec)
{
ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec);
u32 val;
int ret;
/* Both ends need to support this */
if (!tb_dp_is_usb4(in->sw) || !tb_dp_is_usb4(out->sw))
return 0;
ret = tb_port_read(out, &val, TB_CFG_PORT,
out->cap_adap + DP_STATUS_CTRL, 1);
if (ret)
return ret;
val |= DP_STATUS_CTRL_UF | DP_STATUS_CTRL_CMHS;
ret = tb_port_write(out, &val, TB_CFG_PORT,
out->cap_adap + DP_STATUS_CTRL, 1);
if (ret)
return ret;
do {
ret = tb_port_read(out, &val, TB_CFG_PORT,
out->cap_adap + DP_STATUS_CTRL, 1);
if (ret)
return ret;
if (!(val & DP_STATUS_CTRL_CMHS))
return 0;
usleep_range(100, 150);
} while (ktime_before(ktime_get(), timeout));
return -ETIMEDOUT;
}
/*
* Returns maximum possible rate from capability supporting only DP 2.0
* and below. Used when DP BW allocation mode is not enabled.
*/
static inline u32 tb_dp_cap_get_rate(u32 val)
{
u32 rate = (val & DP_COMMON_CAP_RATE_MASK) >> DP_COMMON_CAP_RATE_SHIFT;
switch (rate) {
case DP_COMMON_CAP_RATE_RBR:
return 1620;
case DP_COMMON_CAP_RATE_HBR:
return 2700;
case DP_COMMON_CAP_RATE_HBR2:
return 5400;
case DP_COMMON_CAP_RATE_HBR3:
return 8100;
default:
return 0;
}
}
/*
* Returns maximum possible rate from capability supporting DP 2.1
* UHBR20, 13.5 and 10 rates as well. Use only when DP BW allocation
* mode is enabled.
*/
static inline u32 tb_dp_cap_get_rate_ext(u32 val)
{
if (val & DP_COMMON_CAP_UHBR20)
return 20000;
else if (val & DP_COMMON_CAP_UHBR13_5)
return 13500;
else if (val & DP_COMMON_CAP_UHBR10)
return 10000;
return tb_dp_cap_get_rate(val);
}
static inline bool tb_dp_is_uhbr_rate(unsigned int rate)
{
return rate >= 10000;
}
static inline u32 tb_dp_cap_set_rate(u32 val, u32 rate)
{
val &= ~DP_COMMON_CAP_RATE_MASK;
switch (rate) {
default:
WARN(1, "invalid rate %u passed, defaulting to 1620 MB/s\n", rate);
fallthrough;
case 1620:
val |= DP_COMMON_CAP_RATE_RBR << DP_COMMON_CAP_RATE_SHIFT;
break;
case 2700:
val |= DP_COMMON_CAP_RATE_HBR << DP_COMMON_CAP_RATE_SHIFT;
break;
case 5400:
val |= DP_COMMON_CAP_RATE_HBR2 << DP_COMMON_CAP_RATE_SHIFT;
break;
case 8100:
val |= DP_COMMON_CAP_RATE_HBR3 << DP_COMMON_CAP_RATE_SHIFT;
break;
}
return val;
}
static inline u32 tb_dp_cap_get_lanes(u32 val)
{
u32 lanes = (val & DP_COMMON_CAP_LANES_MASK) >> DP_COMMON_CAP_LANES_SHIFT;
switch (lanes) {
case DP_COMMON_CAP_1_LANE:
return 1;
case DP_COMMON_CAP_2_LANES:
return 2;
case DP_COMMON_CAP_4_LANES:
return 4;
default:
return 0;
}
}
static inline u32 tb_dp_cap_set_lanes(u32 val, u32 lanes)
{
val &= ~DP_COMMON_CAP_LANES_MASK;
switch (lanes) {
default:
WARN(1, "invalid number of lanes %u passed, defaulting to 1\n",
lanes);
fallthrough;
case 1:
val |= DP_COMMON_CAP_1_LANE << DP_COMMON_CAP_LANES_SHIFT;
break;
case 2:
val |= DP_COMMON_CAP_2_LANES << DP_COMMON_CAP_LANES_SHIFT;
break;
case 4:
val |= DP_COMMON_CAP_4_LANES << DP_COMMON_CAP_LANES_SHIFT;
break;
}
return val;
}
static unsigned int tb_dp_bandwidth(unsigned int rate, unsigned int lanes)
{
/* Tunneling removes the DP 8b/10b 128/132b encoding */
if (tb_dp_is_uhbr_rate(rate))
return rate * lanes * 128 / 132;
return rate * lanes * 8 / 10;
}
static int tb_dp_reduce_bandwidth(int max_bw, u32 in_rate, u32 in_lanes,
u32 out_rate, u32 out_lanes, u32 *new_rate,
u32 *new_lanes)
{
static const u32 dp_bw[][2] = {
/* Mb/s, lanes */
{ 8100, 4 }, /* 25920 Mb/s */
{ 5400, 4 }, /* 17280 Mb/s */
{ 8100, 2 }, /* 12960 Mb/s */
{ 2700, 4 }, /* 8640 Mb/s */
{ 5400, 2 }, /* 8640 Mb/s */
{ 8100, 1 }, /* 6480 Mb/s */
{ 1620, 4 }, /* 5184 Mb/s */
{ 5400, 1 }, /* 4320 Mb/s */
{ 2700, 2 }, /* 4320 Mb/s */
{ 1620, 2 }, /* 2592 Mb/s */
{ 2700, 1 }, /* 2160 Mb/s */
{ 1620, 1 }, /* 1296 Mb/s */
};
unsigned int i;
/*
* Find a combination that can fit into max_bw and does not
* exceed the maximum rate and lanes supported by the DP OUT and
* DP IN adapters.
*/
for (i = 0; i < ARRAY_SIZE(dp_bw); i++) {
if (dp_bw[i][0] > out_rate || dp_bw[i][1] > out_lanes)
continue;
if (dp_bw[i][0] > in_rate || dp_bw[i][1] > in_lanes)
continue;
if (tb_dp_bandwidth(dp_bw[i][0], dp_bw[i][1]) <= max_bw) {
*new_rate = dp_bw[i][0];
*new_lanes = dp_bw[i][1];
return 0;
}
}
return -ENOSR;
}
static int tb_dp_xchg_caps(struct tb_tunnel *tunnel)
{
u32 out_dp_cap, out_rate, out_lanes, in_dp_cap, in_rate, in_lanes, bw;
struct tb_port *out = tunnel->dst_port;
struct tb_port *in = tunnel->src_port;
int ret, max_bw;
/*
* Copy DP_LOCAL_CAP register to DP_REMOTE_CAP register for
* newer generation hardware.
*/
if (in->sw->generation < 2 || out->sw->generation < 2)
return 0;
/*
* Perform connection manager handshake between IN and OUT ports
* before capabilities exchange can take place.
*/
ret = tb_dp_cm_handshake(in, out, 3000);
if (ret)
return ret;
/* Read both DP_LOCAL_CAP registers */
ret = tb_port_read(in, &in_dp_cap, TB_CFG_PORT,
in->cap_adap + DP_LOCAL_CAP, 1);
if (ret)
return ret;
ret = tb_port_read(out, &out_dp_cap, TB_CFG_PORT,
out->cap_adap + DP_LOCAL_CAP, 1);
if (ret)
return ret;
/* Write IN local caps to OUT remote caps */
ret = tb_port_write(out, &in_dp_cap, TB_CFG_PORT,
out->cap_adap + DP_REMOTE_CAP, 1);
if (ret)
return ret;
in_rate = tb_dp_cap_get_rate(in_dp_cap);
in_lanes = tb_dp_cap_get_lanes(in_dp_cap);
tb_tunnel_dbg(tunnel,
"DP IN maximum supported bandwidth %u Mb/s x%u = %u Mb/s\n",
in_rate, in_lanes, tb_dp_bandwidth(in_rate, in_lanes));
/*
* If the tunnel bandwidth is limited (max_bw is set) then see
* if we need to reduce bandwidth to fit there.
*/
out_rate = tb_dp_cap_get_rate(out_dp_cap);
out_lanes = tb_dp_cap_get_lanes(out_dp_cap);
bw = tb_dp_bandwidth(out_rate, out_lanes);
tb_tunnel_dbg(tunnel,
"DP OUT maximum supported bandwidth %u Mb/s x%u = %u Mb/s\n",
out_rate, out_lanes, bw);
if (tb_tunnel_direction_downstream(tunnel))
max_bw = tunnel->max_down;
else
max_bw = tunnel->max_up;
if (max_bw && bw > max_bw) {
u32 new_rate, new_lanes, new_bw;
ret = tb_dp_reduce_bandwidth(max_bw, in_rate, in_lanes,
out_rate, out_lanes, &new_rate,
&new_lanes);
if (ret) {
tb_tunnel_info(tunnel, "not enough bandwidth\n");
return ret;
}
new_bw = tb_dp_bandwidth(new_rate, new_lanes);
tb_tunnel_dbg(tunnel,
"bandwidth reduced to %u Mb/s x%u = %u Mb/s\n",
new_rate, new_lanes, new_bw);
/*
* Set new rate and number of lanes before writing it to
* the IN port remote caps.
*/
out_dp_cap = tb_dp_cap_set_rate(out_dp_cap, new_rate);
out_dp_cap = tb_dp_cap_set_lanes(out_dp_cap, new_lanes);
}
/*
* Titan Ridge does not disable AUX timers when it gets
* SET_CONFIG with SET_LTTPR_MODE set. This causes problems with
* DP tunneling.
*/
if (tb_route(out->sw) && tb_switch_is_titan_ridge(out->sw)) {
out_dp_cap |= DP_COMMON_CAP_LTTPR_NS;
tb_tunnel_dbg(tunnel, "disabling LTTPR\n");
}
return tb_port_write(in, &out_dp_cap, TB_CFG_PORT,
in->cap_adap + DP_REMOTE_CAP, 1);
}
static int tb_dp_bandwidth_alloc_mode_enable(struct tb_tunnel *tunnel)
{
int ret, estimated_bw, granularity, tmp;
struct tb_port *out = tunnel->dst_port;
struct tb_port *in = tunnel->src_port;
u32 out_dp_cap, out_rate, out_lanes;
u32 in_dp_cap, in_rate, in_lanes;
u32 rate, lanes;
if (!bw_alloc_mode)
return 0;
ret = usb4_dp_port_set_cm_bandwidth_mode_supported(in, true);
if (ret)
return ret;
ret = usb4_dp_port_set_group_id(in, in->group->index);
if (ret)
return ret;
/*
* Get the non-reduced rate and lanes based on the lowest
* capability of both adapters.
*/
ret = tb_port_read(in, &in_dp_cap, TB_CFG_PORT,
in->cap_adap + DP_LOCAL_CAP, 1);
if (ret)
return ret;
ret = tb_port_read(out, &out_dp_cap, TB_CFG_PORT,
out->cap_adap + DP_LOCAL_CAP, 1);
if (ret)
return ret;
in_rate = tb_dp_cap_get_rate(in_dp_cap);
in_lanes = tb_dp_cap_get_lanes(in_dp_cap);
out_rate = tb_dp_cap_get_rate(out_dp_cap);
out_lanes = tb_dp_cap_get_lanes(out_dp_cap);
rate = min(in_rate, out_rate);
lanes = min(in_lanes, out_lanes);
tmp = tb_dp_bandwidth(rate, lanes);
tb_tunnel_dbg(tunnel, "non-reduced bandwidth %u Mb/s x%u = %u Mb/s\n",
rate, lanes, tmp);
ret = usb4_dp_port_set_nrd(in, rate, lanes);
if (ret)
return ret;
/*
* Pick up granularity that supports maximum possible bandwidth.
* For that we use the UHBR rates too.
*/
in_rate = tb_dp_cap_get_rate_ext(in_dp_cap);
out_rate = tb_dp_cap_get_rate_ext(out_dp_cap);
rate = min(in_rate, out_rate);
tmp = tb_dp_bandwidth(rate, lanes);
tb_tunnel_dbg(tunnel,
"maximum bandwidth through allocation mode %u Mb/s x%u = %u Mb/s\n",
rate, lanes, tmp);
for (granularity = 250; tmp / granularity > 255 && granularity <= 1000;
granularity *= 2)
;
tb_tunnel_dbg(tunnel, "granularity %d Mb/s\n", granularity);
/*
* Returns -EINVAL if granularity above is outside of the
* accepted ranges.
*/
ret = usb4_dp_port_set_granularity(in, granularity);
if (ret)
return ret;
/*
* Bandwidth estimation is pretty much what we have in
* max_up/down fields. For discovery we just read what the
* estimation was set to.
*/
if (tb_tunnel_direction_downstream(tunnel))
estimated_bw = tunnel->max_down;
else
estimated_bw = tunnel->max_up;
tb_tunnel_dbg(tunnel, "estimated bandwidth %d Mb/s\n", estimated_bw);
ret = usb4_dp_port_set_estimated_bandwidth(in, estimated_bw);
if (ret)
return ret;
/* Initial allocation should be 0 according the spec */
ret = usb4_dp_port_allocate_bandwidth(in, 0);
if (ret)
return ret;
tb_tunnel_dbg(tunnel, "bandwidth allocation mode enabled\n");
return 0;
}
static int tb_dp_init(struct tb_tunnel *tunnel)
{
struct tb_port *in = tunnel->src_port;
struct tb_switch *sw = in->sw;
struct tb *tb = in->sw->tb;
int ret;
ret = tb_dp_xchg_caps(tunnel);
if (ret)
return ret;
if (!tb_switch_is_usb4(sw))
return 0;
if (!usb4_dp_port_bandwidth_mode_supported(in))
return 0;
tb_tunnel_dbg(tunnel, "bandwidth allocation mode supported\n");
ret = usb4_dp_port_set_cm_id(in, tb->index);
if (ret)
return ret;
return tb_dp_bandwidth_alloc_mode_enable(tunnel);
}
static void tb_dp_deinit(struct tb_tunnel *tunnel)
{
struct tb_port *in = tunnel->src_port;
if (!usb4_dp_port_bandwidth_mode_supported(in))
return;
if (usb4_dp_port_bandwidth_mode_enabled(in)) {
usb4_dp_port_set_cm_bandwidth_mode_supported(in, false);
tb_tunnel_dbg(tunnel, "bandwidth allocation mode disabled\n");
}
}
static int tb_dp_activate(struct tb_tunnel *tunnel, bool active)
{
int ret;
if (active) {
struct tb_path **paths;
int last;
paths = tunnel->paths;
last = paths[TB_DP_VIDEO_PATH_OUT]->path_length - 1;
tb_dp_port_set_hops(tunnel->src_port,
paths[TB_DP_VIDEO_PATH_OUT]->hops[0].in_hop_index,
paths[TB_DP_AUX_PATH_OUT]->hops[0].in_hop_index,
paths[TB_DP_AUX_PATH_IN]->hops[last].next_hop_index);
tb_dp_port_set_hops(tunnel->dst_port,
paths[TB_DP_VIDEO_PATH_OUT]->hops[last].next_hop_index,
paths[TB_DP_AUX_PATH_IN]->hops[0].in_hop_index,
paths[TB_DP_AUX_PATH_OUT]->hops[last].next_hop_index);
} else {
tb_dp_port_hpd_clear(tunnel->src_port);
tb_dp_port_set_hops(tunnel->src_port, 0, 0, 0);
if (tb_port_is_dpout(tunnel->dst_port))
tb_dp_port_set_hops(tunnel->dst_port, 0, 0, 0);
}
ret = tb_dp_port_enable(tunnel->src_port, active);
if (ret)
return ret;
if (tb_port_is_dpout(tunnel->dst_port))
return tb_dp_port_enable(tunnel->dst_port, active);
return 0;
}
/**
* tb_dp_bandwidth_mode_maximum_bandwidth() - Maximum possible bandwidth
* @tunnel: DP tunnel to check
* @max_bw_rounded: Maximum bandwidth in Mb/s rounded up to the next granularity
*
* Returns maximum possible bandwidth for this tunnel in Mb/s.
*/
static int tb_dp_bandwidth_mode_maximum_bandwidth(struct tb_tunnel *tunnel,
int *max_bw_rounded)
{
struct tb_port *in = tunnel->src_port;
int ret, rate, lanes, max_bw;
u32 cap;
/*
* DP IN adapter DP_LOCAL_CAP gets updated to the lowest AUX
* read parameter values so this so we can use this to determine
* the maximum possible bandwidth over this link.
*
* See USB4 v2 spec 1.0 10.4.4.5.
*/
ret = tb_port_read(in, &cap, TB_CFG_PORT,
in->cap_adap + DP_LOCAL_CAP, 1);
if (ret)
return ret;
rate = tb_dp_cap_get_rate_ext(cap);
lanes = tb_dp_cap_get_lanes(cap);
max_bw = tb_dp_bandwidth(rate, lanes);
if (max_bw_rounded) {
ret = usb4_dp_port_granularity(in);
if (ret < 0)
return ret;
*max_bw_rounded = roundup(max_bw, ret);
}
return max_bw;
}
static int tb_dp_bandwidth_mode_consumed_bandwidth(struct tb_tunnel *tunnel,
int *consumed_up,
int *consumed_down)
{
struct tb_port *in = tunnel->src_port;
int ret, allocated_bw, max_bw_rounded;
if (!usb4_dp_port_bandwidth_mode_enabled(in))
return -EOPNOTSUPP;
if (!tunnel->bw_mode)
return -EOPNOTSUPP;
/* Read what was allocated previously if any */
ret = usb4_dp_port_allocated_bandwidth(in);
if (ret < 0)
return ret;
allocated_bw = ret;
ret = tb_dp_bandwidth_mode_maximum_bandwidth(tunnel, &max_bw_rounded);
if (ret < 0)
return ret;
if (allocated_bw == max_bw_rounded)
allocated_bw = ret;
if (tb_tunnel_direction_downstream(tunnel)) {
*consumed_up = 0;
*consumed_down = allocated_bw;
} else {
*consumed_up = allocated_bw;
*consumed_down = 0;
}
return 0;
}
static int tb_dp_allocated_bandwidth(struct tb_tunnel *tunnel, int *allocated_up,
int *allocated_down)
{
struct tb_port *in = tunnel->src_port;
/*
* If we have already set the allocated bandwidth then use that.
* Otherwise we read it from the DPRX.
*/
if (usb4_dp_port_bandwidth_mode_enabled(in) && tunnel->bw_mode) {
int ret, allocated_bw, max_bw_rounded;
ret = usb4_dp_port_allocated_bandwidth(in);
if (ret < 0)
return ret;
allocated_bw = ret;
ret = tb_dp_bandwidth_mode_maximum_bandwidth(tunnel,
&max_bw_rounded);
if (ret < 0)
return ret;
if (allocated_bw == max_bw_rounded)
allocated_bw = ret;
if (tb_tunnel_direction_downstream(tunnel)) {
*allocated_up = 0;
*allocated_down = allocated_bw;
} else {
*allocated_up = allocated_bw;
*allocated_down = 0;
}
return 0;
}
return tunnel->consumed_bandwidth(tunnel, allocated_up,
allocated_down);
}
static int tb_dp_alloc_bandwidth(struct tb_tunnel *tunnel, int *alloc_up,
int *alloc_down)
{
struct tb_port *in = tunnel->src_port;
int max_bw_rounded, ret, tmp;
if (!usb4_dp_port_bandwidth_mode_enabled(in))
return -EOPNOTSUPP;
ret = tb_dp_bandwidth_mode_maximum_bandwidth(tunnel, &max_bw_rounded);
if (ret < 0)
return ret;
if (tb_tunnel_direction_downstream(tunnel)) {
tmp = min(*alloc_down, max_bw_rounded);
ret = usb4_dp_port_allocate_bandwidth(in, tmp);
if (ret)
return ret;
*alloc_down = tmp;
*alloc_up = 0;
} else {
tmp = min(*alloc_up, max_bw_rounded);
ret = usb4_dp_port_allocate_bandwidth(in, tmp);
if (ret)
return ret;
*alloc_down = 0;
*alloc_up = tmp;
}
/* Now we can use BW mode registers to figure out the bandwidth */
/* TODO: need to handle discovery too */
tunnel->bw_mode = true;
return 0;
}
static int tb_dp_wait_dprx(struct tb_tunnel *tunnel, int timeout_msec)
{
ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec);
struct tb_port *in = tunnel->src_port;
/*
* Wait for DPRX done. Normally it should be already set for
* active tunnel.
*/
do {
u32 val;
int ret;
ret = tb_port_read(in, &val, TB_CFG_PORT,
in->cap_adap + DP_COMMON_CAP, 1);
if (ret)
return ret;
if (val & DP_COMMON_CAP_DPRX_DONE) {
tb_tunnel_dbg(tunnel, "DPRX read done\n");
return 0;
}
usleep_range(100, 150);
} while (ktime_before(ktime_get(), timeout));
tb_tunnel_dbg(tunnel, "DPRX read timeout\n");
return -ETIMEDOUT;
}
/* Read cap from tunnel DP IN */
static int tb_dp_read_cap(struct tb_tunnel *tunnel, unsigned int cap, u32 *rate,
u32 *lanes)
{
struct tb_port *in = tunnel->src_port;
u32 val;
int ret;
switch (cap) {
case DP_LOCAL_CAP:
case DP_REMOTE_CAP:
case DP_COMMON_CAP:
break;
default:
tb_tunnel_WARN(tunnel, "invalid capability index %#x\n", cap);
return -EINVAL;
}
/*
* Read from the copied remote cap so that we take into account
* if capabilities were reduced during exchange.
*/
ret = tb_port_read(in, &val, TB_CFG_PORT, in->cap_adap + cap, 1);
if (ret)
return ret;
*rate = tb_dp_cap_get_rate(val);
*lanes = tb_dp_cap_get_lanes(val);
return 0;
}
static int tb_dp_maximum_bandwidth(struct tb_tunnel *tunnel, int *max_up,
int *max_down)
{
int ret;
if (!usb4_dp_port_bandwidth_mode_enabled(tunnel->src_port))
return -EOPNOTSUPP;
ret = tb_dp_bandwidth_mode_maximum_bandwidth(tunnel, NULL);
if (ret < 0)
return ret;
if (tb_tunnel_direction_downstream(tunnel)) {
*max_up = 0;
*max_down = ret;
} else {
*max_up = ret;
*max_down = 0;
}
return 0;
}
static int tb_dp_consumed_bandwidth(struct tb_tunnel *tunnel, int *consumed_up,
int *consumed_down)
{
const struct tb_switch *sw = tunnel->src_port->sw;
u32 rate = 0, lanes = 0;
int ret;
if (tb_dp_is_usb4(sw)) {
/*
* On USB4 routers check if the bandwidth allocation
* mode is enabled first and then read the bandwidth
* through those registers.
*/
ret = tb_dp_bandwidth_mode_consumed_bandwidth(tunnel, consumed_up,
consumed_down);
if (ret < 0) {
if (ret != -EOPNOTSUPP)
return ret;
} else if (!ret) {
return 0;
}
/*
* Then see if the DPRX negotiation is ready and if yes
* return that bandwidth (it may be smaller than the
* reduced one). According to VESA spec, the DPRX
* negotiation shall compete in 5 seconds after tunnel
* established. We give it 100ms extra just in case.
*/
ret = tb_dp_wait_dprx(tunnel, 5100);
if (ret)
return ret;
ret = tb_dp_read_cap(tunnel, DP_COMMON_CAP, &rate, &lanes);
if (ret)
return ret;
} else if (sw->generation >= 2) {
ret = tb_dp_read_cap(tunnel, DP_REMOTE_CAP, &rate, &lanes);
if (ret)
return ret;
} else {
/* No bandwidth management for legacy devices */
*consumed_up = 0;
*consumed_down = 0;
return 0;
}
if (tb_tunnel_direction_downstream(tunnel)) {
*consumed_up = 0;
*consumed_down = tb_dp_bandwidth(rate, lanes);
} else {
*consumed_up = tb_dp_bandwidth(rate, lanes);
*consumed_down = 0;
}
return 0;
}
static void tb_dp_init_aux_credits(struct tb_path_hop *hop)
{
struct tb_port *port = hop->in_port;
struct tb_switch *sw = port->sw;
if (tb_port_use_credit_allocation(port))
hop->initial_credits = sw->min_dp_aux_credits;
else
hop->initial_credits = 1;
}
static void tb_dp_init_aux_path(struct tb_path *path, bool pm_support)
{
struct tb_path_hop *hop;
path->egress_fc_enable = TB_PATH_SOURCE | TB_PATH_INTERNAL;
path->egress_shared_buffer = TB_PATH_NONE;
path->ingress_fc_enable = TB_PATH_ALL;
path->ingress_shared_buffer = TB_PATH_NONE;
path->priority = TB_DP_AUX_PRIORITY;
path->weight = TB_DP_AUX_WEIGHT;
tb_path_for_each_hop(path, hop) {
tb_dp_init_aux_credits(hop);
if (pm_support)
tb_init_pm_support(hop);
}
}
static int tb_dp_init_video_credits(struct tb_path_hop *hop)
{
struct tb_port *port = hop->in_port;
struct tb_switch *sw = port->sw;
if (tb_port_use_credit_allocation(port)) {
unsigned int nfc_credits;
size_t max_dp_streams;
tb_available_credits(port, &max_dp_streams);
/*
* Read the number of currently allocated NFC credits
* from the lane adapter. Since we only use them for DP
* tunneling we can use that to figure out how many DP
* tunnels already go through the lane adapter.
*/
nfc_credits = port->config.nfc_credits &
ADP_CS_4_NFC_BUFFERS_MASK;
if (nfc_credits / sw->min_dp_main_credits > max_dp_streams)
return -ENOSPC;
hop->nfc_credits = sw->min_dp_main_credits;
} else {
hop->nfc_credits = min(port->total_credits - 2, 12U);
}
return 0;
}
static int tb_dp_init_video_path(struct tb_path *path, bool pm_support)
{
struct tb_path_hop *hop;
path->egress_fc_enable = TB_PATH_NONE;
path->egress_shared_buffer = TB_PATH_NONE;
path->ingress_fc_enable = TB_PATH_NONE;
path->ingress_shared_buffer = TB_PATH_NONE;
path->priority = TB_DP_VIDEO_PRIORITY;
path->weight = TB_DP_VIDEO_WEIGHT;
tb_path_for_each_hop(path, hop) {
int ret;
ret = tb_dp_init_video_credits(hop);
if (ret)
return ret;
if (pm_support)
tb_init_pm_support(hop);
}
return 0;
}
static void tb_dp_dump(struct tb_tunnel *tunnel)
{
struct tb_port *in, *out;
u32 dp_cap, rate, lanes;
in = tunnel->src_port;
out = tunnel->dst_port;
if (tb_port_read(in, &dp_cap, TB_CFG_PORT,
in->cap_adap + DP_LOCAL_CAP, 1))
return;
rate = tb_dp_cap_get_rate(dp_cap);
lanes = tb_dp_cap_get_lanes(dp_cap);
tb_tunnel_dbg(tunnel,
"DP IN maximum supported bandwidth %u Mb/s x%u = %u Mb/s\n",
rate, lanes, tb_dp_bandwidth(rate, lanes));
if (tb_port_read(out, &dp_cap, TB_CFG_PORT,
out->cap_adap + DP_LOCAL_CAP, 1))
return;
rate = tb_dp_cap_get_rate(dp_cap);
lanes = tb_dp_cap_get_lanes(dp_cap);
tb_tunnel_dbg(tunnel,
"DP OUT maximum supported bandwidth %u Mb/s x%u = %u Mb/s\n",
rate, lanes, tb_dp_bandwidth(rate, lanes));
if (tb_port_read(in, &dp_cap, TB_CFG_PORT,
in->cap_adap + DP_REMOTE_CAP, 1))
return;
rate = tb_dp_cap_get_rate(dp_cap);
lanes = tb_dp_cap_get_lanes(dp_cap);
tb_tunnel_dbg(tunnel, "reduced bandwidth %u Mb/s x%u = %u Mb/s\n",
rate, lanes, tb_dp_bandwidth(rate, lanes));
}
/**
* tb_tunnel_discover_dp() - Discover existing Display Port tunnels
* @tb: Pointer to the domain structure
* @in: DP in adapter
* @alloc_hopid: Allocate HopIDs from visited ports
*
* If @in adapter is active, follows the tunnel to the DP out adapter
* and back. Returns the discovered tunnel or %NULL if there was no
* tunnel.
*
* Return: DP tunnel or %NULL if no tunnel found.
*/
struct tb_tunnel *tb_tunnel_discover_dp(struct tb *tb, struct tb_port *in,
bool alloc_hopid)
{
struct tb_tunnel *tunnel;
struct tb_port *port;
struct tb_path *path;
if (!tb_dp_port_is_enabled(in))
return NULL;
tunnel = tb_tunnel_alloc(tb, 3, TB_TUNNEL_DP);
if (!tunnel)
return NULL;
tunnel->init = tb_dp_init;
tunnel->deinit = tb_dp_deinit;
tunnel->activate = tb_dp_activate;
tunnel->maximum_bandwidth = tb_dp_maximum_bandwidth;
tunnel->allocated_bandwidth = tb_dp_allocated_bandwidth;
tunnel->alloc_bandwidth = tb_dp_alloc_bandwidth;
tunnel->consumed_bandwidth = tb_dp_consumed_bandwidth;
tunnel->src_port = in;
path = tb_path_discover(in, TB_DP_VIDEO_HOPID, NULL, -1,
&tunnel->dst_port, "Video", alloc_hopid);
if (!path) {
/* Just disable the DP IN port */
tb_dp_port_enable(in, false);
goto err_free;
}
tunnel->paths[TB_DP_VIDEO_PATH_OUT] = path;
if (tb_dp_init_video_path(tunnel->paths[TB_DP_VIDEO_PATH_OUT], false))
goto err_free;
path = tb_path_discover(in, TB_DP_AUX_TX_HOPID, NULL, -1, NULL, "AUX TX",
alloc_hopid);
if (!path)
goto err_deactivate;
tunnel->paths[TB_DP_AUX_PATH_OUT] = path;
tb_dp_init_aux_path(tunnel->paths[TB_DP_AUX_PATH_OUT], false);
path = tb_path_discover(tunnel->dst_port, -1, in, TB_DP_AUX_RX_HOPID,
&port, "AUX RX", alloc_hopid);
if (!path)
goto err_deactivate;
tunnel->paths[TB_DP_AUX_PATH_IN] = path;
tb_dp_init_aux_path(tunnel->paths[TB_DP_AUX_PATH_IN], false);
/* Validate that the tunnel is complete */
if (!tb_port_is_dpout(tunnel->dst_port)) {
tb_port_warn(in, "path does not end on a DP adapter, cleaning up\n");
goto err_deactivate;
}
if (!tb_dp_port_is_enabled(tunnel->dst_port))
goto err_deactivate;
if (!tb_dp_port_hpd_is_active(tunnel->dst_port))
goto err_deactivate;
if (port != tunnel->src_port) {
tb_tunnel_warn(tunnel, "path is not complete, cleaning up\n");
goto err_deactivate;
}
tb_dp_dump(tunnel);
tb_tunnel_dbg(tunnel, "discovered\n");
return tunnel;
err_deactivate:
tb_tunnel_deactivate(tunnel);
err_free:
tb_tunnel_free(tunnel);
return NULL;
}
/**
* tb_tunnel_alloc_dp() - allocate a Display Port tunnel
* @tb: Pointer to the domain structure
* @in: DP in adapter port
* @out: DP out adapter port
* @link_nr: Preferred lane adapter when the link is not bonded
* @max_up: Maximum available upstream bandwidth for the DP tunnel.
* %0 if no available bandwidth.
* @max_down: Maximum available downstream bandwidth for the DP tunnel.
* %0 if no available bandwidth.
*
* Allocates a tunnel between @in and @out that is capable of tunneling
* Display Port traffic.
*
* Return: Returns a tb_tunnel on success or NULL on failure.
*/
struct tb_tunnel *tb_tunnel_alloc_dp(struct tb *tb, struct tb_port *in,
struct tb_port *out, int link_nr,
int max_up, int max_down)
{
struct tb_tunnel *tunnel;
struct tb_path **paths;
struct tb_path *path;
bool pm_support;
if (WARN_ON(!in->cap_adap || !out->cap_adap))
return NULL;
tunnel = tb_tunnel_alloc(tb, 3, TB_TUNNEL_DP);
if (!tunnel)
return NULL;
tunnel->init = tb_dp_init;
tunnel->deinit = tb_dp_deinit;
tunnel->activate = tb_dp_activate;
tunnel->maximum_bandwidth = tb_dp_maximum_bandwidth;
tunnel->allocated_bandwidth = tb_dp_allocated_bandwidth;
tunnel->alloc_bandwidth = tb_dp_alloc_bandwidth;
tunnel->consumed_bandwidth = tb_dp_consumed_bandwidth;
tunnel->src_port = in;
tunnel->dst_port = out;
tunnel->max_up = max_up;
tunnel->max_down = max_down;
paths = tunnel->paths;
pm_support = usb4_switch_version(in->sw) >= 2;
path = tb_path_alloc(tb, in, TB_DP_VIDEO_HOPID, out, TB_DP_VIDEO_HOPID,
link_nr, "Video");
if (!path)
goto err_free;
tb_dp_init_video_path(path, pm_support);
paths[TB_DP_VIDEO_PATH_OUT] = path;
path = tb_path_alloc(tb, in, TB_DP_AUX_TX_HOPID, out,
TB_DP_AUX_TX_HOPID, link_nr, "AUX TX");
if (!path)
goto err_free;
tb_dp_init_aux_path(path, pm_support);
paths[TB_DP_AUX_PATH_OUT] = path;
path = tb_path_alloc(tb, out, TB_DP_AUX_RX_HOPID, in,
TB_DP_AUX_RX_HOPID, link_nr, "AUX RX");
if (!path)
goto err_free;
tb_dp_init_aux_path(path, pm_support);
paths[TB_DP_AUX_PATH_IN] = path;
return tunnel;
err_free:
tb_tunnel_free(tunnel);
return NULL;
}
static unsigned int tb_dma_available_credits(const struct tb_port *port)
{
const struct tb_switch *sw = port->sw;
int credits;
credits = tb_available_credits(port, NULL);
if (tb_acpi_may_tunnel_pcie())
credits -= sw->max_pcie_credits;
credits -= port->dma_credits;
return credits > 0 ? credits : 0;
}
static int tb_dma_reserve_credits(struct tb_path_hop *hop, unsigned int credits)
{
struct tb_port *port = hop->in_port;
if (tb_port_use_credit_allocation(port)) {
unsigned int available = tb_dma_available_credits(port);
/*
* Need to have at least TB_MIN_DMA_CREDITS, otherwise
* DMA path cannot be established.
*/
if (available < TB_MIN_DMA_CREDITS)
return -ENOSPC;
while (credits > available)
credits--;
tb_port_dbg(port, "reserving %u credits for DMA path\n",
credits);
port->dma_credits += credits;
} else {
if (tb_port_is_null(port))
credits = port->bonded ? 14 : 6;
else
credits = min(port->total_credits, credits);
}
hop->initial_credits = credits;
return 0;
}
/* Path from lane adapter to NHI */
static int tb_dma_init_rx_path(struct tb_path *path, unsigned int credits)
{
struct tb_path_hop *hop;
unsigned int i, tmp;
path->egress_fc_enable = TB_PATH_SOURCE | TB_PATH_INTERNAL;
path->ingress_fc_enable = TB_PATH_ALL;
path->egress_shared_buffer = TB_PATH_NONE;
path->ingress_shared_buffer = TB_PATH_NONE;
path->priority = TB_DMA_PRIORITY;
path->weight = TB_DMA_WEIGHT;
path->clear_fc = true;
/*
* First lane adapter is the one connected to the remote host.
* We don't tunnel other traffic over this link so can use all
* the credits (except the ones reserved for control traffic).
*/
hop = &path->hops[0];
tmp = min(tb_usable_credits(hop->in_port), credits);
hop->initial_credits = tmp;
hop->in_port->dma_credits += tmp;
for (i = 1; i < path->path_length; i++) {
int ret;
ret = tb_dma_reserve_credits(&path->hops[i], credits);
if (ret)
return ret;
}
return 0;
}
/* Path from NHI to lane adapter */
static int tb_dma_init_tx_path(struct tb_path *path, unsigned int credits)
{
struct tb_path_hop *hop;
path->egress_fc_enable = TB_PATH_ALL;
path->ingress_fc_enable = TB_PATH_ALL;
path->egress_shared_buffer = TB_PATH_NONE;
path->ingress_shared_buffer = TB_PATH_NONE;
path->priority = TB_DMA_PRIORITY;
path->weight = TB_DMA_WEIGHT;
path->clear_fc = true;
tb_path_for_each_hop(path, hop) {
int ret;
ret = tb_dma_reserve_credits(hop, credits);
if (ret)
return ret;
}
return 0;
}
static void tb_dma_release_credits(struct tb_path_hop *hop)
{
struct tb_port *port = hop->in_port;
if (tb_port_use_credit_allocation(port)) {
port->dma_credits -= hop->initial_credits;
tb_port_dbg(port, "released %u DMA path credits\n",
hop->initial_credits);
}
}
static void tb_dma_deinit_path(struct tb_path *path)
{
struct tb_path_hop *hop;
tb_path_for_each_hop(path, hop)
tb_dma_release_credits(hop);
}
static void tb_dma_deinit(struct tb_tunnel *tunnel)
{
int i;
for (i = 0; i < tunnel->npaths; i++) {
if (!tunnel->paths[i])
continue;
tb_dma_deinit_path(tunnel->paths[i]);
}
}
/**
* tb_tunnel_alloc_dma() - allocate a DMA tunnel
* @tb: Pointer to the domain structure
* @nhi: Host controller port
* @dst: Destination null port which the other domain is connected to
* @transmit_path: HopID used for transmitting packets
* @transmit_ring: NHI ring number used to send packets towards the
* other domain. Set to %-1 if TX path is not needed.
* @receive_path: HopID used for receiving packets
* @receive_ring: NHI ring number used to receive packets from the
* other domain. Set to %-1 if RX path is not needed.
*
* Return: Returns a tb_tunnel on success or NULL on failure.
*/
struct tb_tunnel *tb_tunnel_alloc_dma(struct tb *tb, struct tb_port *nhi,
struct tb_port *dst, int transmit_path,
int transmit_ring, int receive_path,
int receive_ring)
{
struct tb_tunnel *tunnel;
size_t npaths = 0, i = 0;
struct tb_path *path;
int credits;
/* Ring 0 is reserved for control channel */
if (WARN_ON(!receive_ring || !transmit_ring))
return NULL;
if (receive_ring > 0)
npaths++;
if (transmit_ring > 0)
npaths++;
if (WARN_ON(!npaths))
return NULL;
tunnel = tb_tunnel_alloc(tb, npaths, TB_TUNNEL_DMA);
if (!tunnel)
return NULL;
tunnel->src_port = nhi;
tunnel->dst_port = dst;
tunnel->deinit = tb_dma_deinit;
credits = min_not_zero(dma_credits, nhi->sw->max_dma_credits);
if (receive_ring > 0) {
path = tb_path_alloc(tb, dst, receive_path, nhi, receive_ring, 0,
"DMA RX");
if (!path)
goto err_free;
tunnel->paths[i++] = path;
if (tb_dma_init_rx_path(path, credits)) {
tb_tunnel_dbg(tunnel, "not enough buffers for RX path\n");
goto err_free;
}
}
if (transmit_ring > 0) {
path = tb_path_alloc(tb, nhi, transmit_ring, dst, transmit_path, 0,
"DMA TX");
if (!path)
goto err_free;
tunnel->paths[i++] = path;
if (tb_dma_init_tx_path(path, credits)) {
tb_tunnel_dbg(tunnel, "not enough buffers for TX path\n");
goto err_free;
}
}
return tunnel;
err_free:
tb_tunnel_free(tunnel);
return NULL;
}
/**
* tb_tunnel_match_dma() - Match DMA tunnel
* @tunnel: Tunnel to match
* @transmit_path: HopID used for transmitting packets. Pass %-1 to ignore.
* @transmit_ring: NHI ring number used to send packets towards the
* other domain. Pass %-1 to ignore.
* @receive_path: HopID used for receiving packets. Pass %-1 to ignore.
* @receive_ring: NHI ring number used to receive packets from the
* other domain. Pass %-1 to ignore.
*
* This function can be used to match specific DMA tunnel, if there are
* multiple DMA tunnels going through the same XDomain connection.
* Returns true if there is match and false otherwise.
*/
bool tb_tunnel_match_dma(const struct tb_tunnel *tunnel, int transmit_path,
int transmit_ring, int receive_path, int receive_ring)
{
const struct tb_path *tx_path = NULL, *rx_path = NULL;
int i;
if (!receive_ring || !transmit_ring)
return false;
for (i = 0; i < tunnel->npaths; i++) {
const struct tb_path *path = tunnel->paths[i];
if (!path)
continue;
if (tb_port_is_nhi(path->hops[0].in_port))
tx_path = path;
else if (tb_port_is_nhi(path->hops[path->path_length - 1].out_port))
rx_path = path;
}
if (transmit_ring > 0 || transmit_path > 0) {
if (!tx_path)
return false;
if (transmit_ring > 0 &&
(tx_path->hops[0].in_hop_index != transmit_ring))
return false;
if (transmit_path > 0 &&
(tx_path->hops[tx_path->path_length - 1].next_hop_index != transmit_path))
return false;
}
if (receive_ring > 0 || receive_path > 0) {
if (!rx_path)
return false;
if (receive_path > 0 &&
(rx_path->hops[0].in_hop_index != receive_path))
return false;
if (receive_ring > 0 &&
(rx_path->hops[rx_path->path_length - 1].next_hop_index != receive_ring))
return false;
}
return true;
}
static int tb_usb3_max_link_rate(struct tb_port *up, struct tb_port *down)
{
int ret, up_max_rate, down_max_rate;
ret = usb4_usb3_port_max_link_rate(up);
if (ret < 0)
return ret;
up_max_rate = ret;
ret = usb4_usb3_port_max_link_rate(down);
if (ret < 0)
return ret;
down_max_rate = ret;
return min(up_max_rate, down_max_rate);
}
static int tb_usb3_init(struct tb_tunnel *tunnel)
{
tb_tunnel_dbg(tunnel, "allocating initial bandwidth %d/%d Mb/s\n",
tunnel->allocated_up, tunnel->allocated_down);
return usb4_usb3_port_allocate_bandwidth(tunnel->src_port,
&tunnel->allocated_up,
&tunnel->allocated_down);
}
static int tb_usb3_activate(struct tb_tunnel *tunnel, bool activate)
{
int res;
res = tb_usb3_port_enable(tunnel->src_port, activate);
if (res)
return res;
if (tb_port_is_usb3_up(tunnel->dst_port))
return tb_usb3_port_enable(tunnel->dst_port, activate);
return 0;
}
static int tb_usb3_consumed_bandwidth(struct tb_tunnel *tunnel,
int *consumed_up, int *consumed_down)
{
struct tb_port *port = tb_upstream_port(tunnel->dst_port->sw);
int pcie_weight = tb_acpi_may_tunnel_pcie() ? TB_PCI_WEIGHT : 0;
/*
* PCIe tunneling, if enabled, affects the USB3 bandwidth so
* take that it into account here.
*/
*consumed_up = tunnel->allocated_up *
(TB_USB3_WEIGHT + pcie_weight) / TB_USB3_WEIGHT;
*consumed_down = tunnel->allocated_down *
(TB_USB3_WEIGHT + pcie_weight) / TB_USB3_WEIGHT;
if (tb_port_get_link_generation(port) >= 4) {
*consumed_up = max(*consumed_up, USB4_V2_USB3_MIN_BANDWIDTH);
*consumed_down = max(*consumed_down, USB4_V2_USB3_MIN_BANDWIDTH);
}
return 0;
}
static int tb_usb3_release_unused_bandwidth(struct tb_tunnel *tunnel)
{
int ret;
ret = usb4_usb3_port_release_bandwidth(tunnel->src_port,
&tunnel->allocated_up,
&tunnel->allocated_down);
if (ret)
return ret;
tb_tunnel_dbg(tunnel, "decreased bandwidth allocation to %d/%d Mb/s\n",
tunnel->allocated_up, tunnel->allocated_down);
return 0;
}
static void tb_usb3_reclaim_available_bandwidth(struct tb_tunnel *tunnel,
int *available_up,
int *available_down)
{
int ret, max_rate, allocate_up, allocate_down;
ret = tb_usb3_max_link_rate(tunnel->dst_port, tunnel->src_port);
if (ret < 0) {
tb_tunnel_warn(tunnel, "failed to read maximum link rate\n");
return;
}
/*
* 90% of the max rate can be allocated for isochronous
* transfers.
*/
max_rate = ret * 90 / 100;
/* No need to reclaim if already at maximum */
if (tunnel->allocated_up >= max_rate &&
tunnel->allocated_down >= max_rate)
return;
/* Don't go lower than what is already allocated */
allocate_up = min(max_rate, *available_up);
if (allocate_up < tunnel->allocated_up)
allocate_up = tunnel->allocated_up;
allocate_down = min(max_rate, *available_down);
if (allocate_down < tunnel->allocated_down)
allocate_down = tunnel->allocated_down;
/* If no changes no need to do more */
if (allocate_up == tunnel->allocated_up &&
allocate_down == tunnel->allocated_down)
return;
ret = usb4_usb3_port_allocate_bandwidth(tunnel->src_port, &allocate_up,
&allocate_down);
if (ret) {
tb_tunnel_info(tunnel, "failed to allocate bandwidth\n");
return;
}
tunnel->allocated_up = allocate_up;
*available_up -= tunnel->allocated_up;
tunnel->allocated_down = allocate_down;
*available_down -= tunnel->allocated_down;
tb_tunnel_dbg(tunnel, "increased bandwidth allocation to %d/%d Mb/s\n",
tunnel->allocated_up, tunnel->allocated_down);
}
static void tb_usb3_init_credits(struct tb_path_hop *hop)
{
struct tb_port *port = hop->in_port;
struct tb_switch *sw = port->sw;
unsigned int credits;
if (tb_port_use_credit_allocation(port)) {
credits = sw->max_usb3_credits;
} else {
if (tb_port_is_null(port))
credits = port->bonded ? 32 : 16;
else
credits = 7;
}
hop->initial_credits = credits;
}
static void tb_usb3_init_path(struct tb_path *path)
{
struct tb_path_hop *hop;
path->egress_fc_enable = TB_PATH_SOURCE | TB_PATH_INTERNAL;
path->egress_shared_buffer = TB_PATH_NONE;
path->ingress_fc_enable = TB_PATH_ALL;
path->ingress_shared_buffer = TB_PATH_NONE;
path->priority = TB_USB3_PRIORITY;
path->weight = TB_USB3_WEIGHT;
path->drop_packages = 0;
tb_path_for_each_hop(path, hop)
tb_usb3_init_credits(hop);
}
/**
* tb_tunnel_discover_usb3() - Discover existing USB3 tunnels
* @tb: Pointer to the domain structure
* @down: USB3 downstream adapter
* @alloc_hopid: Allocate HopIDs from visited ports
*
* If @down adapter is active, follows the tunnel to the USB3 upstream
* adapter and back. Returns the discovered tunnel or %NULL if there was
* no tunnel.
*/
struct tb_tunnel *tb_tunnel_discover_usb3(struct tb *tb, struct tb_port *down,
bool alloc_hopid)
{
struct tb_tunnel *tunnel;
struct tb_path *path;
if (!tb_usb3_port_is_enabled(down))
return NULL;
tunnel = tb_tunnel_alloc(tb, 2, TB_TUNNEL_USB3);
if (!tunnel)
return NULL;
tunnel->activate = tb_usb3_activate;
tunnel->src_port = down;
/*
* Discover both paths even if they are not complete. We will
* clean them up by calling tb_tunnel_deactivate() below in that
* case.
*/
path = tb_path_discover(down, TB_USB3_HOPID, NULL, -1,
&tunnel->dst_port, "USB3 Down", alloc_hopid);
if (!path) {
/* Just disable the downstream port */
tb_usb3_port_enable(down, false);
goto err_free;
}
tunnel->paths[TB_USB3_PATH_DOWN] = path;
tb_usb3_init_path(tunnel->paths[TB_USB3_PATH_DOWN]);
path = tb_path_discover(tunnel->dst_port, -1, down, TB_USB3_HOPID, NULL,
"USB3 Up", alloc_hopid);
if (!path)
goto err_deactivate;
tunnel->paths[TB_USB3_PATH_UP] = path;
tb_usb3_init_path(tunnel->paths[TB_USB3_PATH_UP]);
/* Validate that the tunnel is complete */
if (!tb_port_is_usb3_up(tunnel->dst_port)) {
tb_port_warn(tunnel->dst_port,
"path does not end on an USB3 adapter, cleaning up\n");
goto err_deactivate;
}
if (down != tunnel->src_port) {
tb_tunnel_warn(tunnel, "path is not complete, cleaning up\n");
goto err_deactivate;
}
if (!tb_usb3_port_is_enabled(tunnel->dst_port)) {
tb_tunnel_warn(tunnel,
"tunnel is not fully activated, cleaning up\n");
goto err_deactivate;
}
if (!tb_route(down->sw)) {
int ret;
/*
* Read the initial bandwidth allocation for the first
* hop tunnel.
*/
ret = usb4_usb3_port_allocated_bandwidth(down,
&tunnel->allocated_up, &tunnel->allocated_down);
if (ret)
goto err_deactivate;
tb_tunnel_dbg(tunnel, "currently allocated bandwidth %d/%d Mb/s\n",
tunnel->allocated_up, tunnel->allocated_down);
tunnel->init = tb_usb3_init;
tunnel->consumed_bandwidth = tb_usb3_consumed_bandwidth;
tunnel->release_unused_bandwidth =
tb_usb3_release_unused_bandwidth;
tunnel->reclaim_available_bandwidth =
tb_usb3_reclaim_available_bandwidth;
}
tb_tunnel_dbg(tunnel, "discovered\n");
return tunnel;
err_deactivate:
tb_tunnel_deactivate(tunnel);
err_free:
tb_tunnel_free(tunnel);
return NULL;
}
/**
* tb_tunnel_alloc_usb3() - allocate a USB3 tunnel
* @tb: Pointer to the domain structure
* @up: USB3 upstream adapter port
* @down: USB3 downstream adapter port
* @max_up: Maximum available upstream bandwidth for the USB3 tunnel.
* %0 if no available bandwidth.
* @max_down: Maximum available downstream bandwidth for the USB3 tunnel.
* %0 if no available bandwidth.
*
* Allocate an USB3 tunnel. The ports must be of type @TB_TYPE_USB3_UP and
* @TB_TYPE_USB3_DOWN.
*
* Return: Returns a tb_tunnel on success or %NULL on failure.
*/
struct tb_tunnel *tb_tunnel_alloc_usb3(struct tb *tb, struct tb_port *up,
struct tb_port *down, int max_up,
int max_down)
{
struct tb_tunnel *tunnel;
struct tb_path *path;
int max_rate = 0;
if (!tb_route(down->sw) && (max_up > 0 || max_down > 0)) {
/*
* For USB3 isochronous transfers, we allow bandwidth which is
* not higher than 90% of maximum supported bandwidth by USB3
* adapters.
*/
max_rate = tb_usb3_max_link_rate(down, up);
if (max_rate < 0)
return NULL;
max_rate = max_rate * 90 / 100;
tb_port_dbg(up, "maximum required bandwidth for USB3 tunnel %d Mb/s\n",
max_rate);
}
tunnel = tb_tunnel_alloc(tb, 2, TB_TUNNEL_USB3);
if (!tunnel)
return NULL;
tunnel->activate = tb_usb3_activate;
tunnel->src_port = down;
tunnel->dst_port = up;
tunnel->max_up = max_up;
tunnel->max_down = max_down;
path = tb_path_alloc(tb, down, TB_USB3_HOPID, up, TB_USB3_HOPID, 0,
"USB3 Down");
if (!path) {
tb_tunnel_free(tunnel);
return NULL;
}
tb_usb3_init_path(path);
tunnel->paths[TB_USB3_PATH_DOWN] = path;
path = tb_path_alloc(tb, up, TB_USB3_HOPID, down, TB_USB3_HOPID, 0,
"USB3 Up");
if (!path) {
tb_tunnel_free(tunnel);
return NULL;
}
tb_usb3_init_path(path);
tunnel->paths[TB_USB3_PATH_UP] = path;
if (!tb_route(down->sw)) {
tunnel->allocated_up = min(max_rate, max_up);
tunnel->allocated_down = min(max_rate, max_down);
tunnel->init = tb_usb3_init;
tunnel->consumed_bandwidth = tb_usb3_consumed_bandwidth;
tunnel->release_unused_bandwidth =
tb_usb3_release_unused_bandwidth;
tunnel->reclaim_available_bandwidth =
tb_usb3_reclaim_available_bandwidth;
}
return tunnel;
}
/**
* tb_tunnel_free() - free a tunnel
* @tunnel: Tunnel to be freed
*
* Frees a tunnel. The tunnel does not need to be deactivated.
*/
void tb_tunnel_free(struct tb_tunnel *tunnel)
{
int i;
if (!tunnel)
return;
if (tunnel->deinit)
tunnel->deinit(tunnel);
for (i = 0; i < tunnel->npaths; i++) {
if (tunnel->paths[i])
tb_path_free(tunnel->paths[i]);
}
kfree(tunnel->paths);
kfree(tunnel);
}
/**
* tb_tunnel_is_invalid - check whether an activated path is still valid
* @tunnel: Tunnel to check
*/
bool tb_tunnel_is_invalid(struct tb_tunnel *tunnel)
{
int i;
for (i = 0; i < tunnel->npaths; i++) {
WARN_ON(!tunnel->paths[i]->activated);
if (tb_path_is_invalid(tunnel->paths[i]))
return true;
}
return false;
}
/**
* tb_tunnel_restart() - activate a tunnel after a hardware reset
* @tunnel: Tunnel to restart
*
* Return: 0 on success and negative errno in case if failure
*/
int tb_tunnel_restart(struct tb_tunnel *tunnel)
{
int res, i;
tb_tunnel_dbg(tunnel, "activating\n");
/*
* Make sure all paths are properly disabled before enabling
* them again.
*/
for (i = 0; i < tunnel->npaths; i++) {
if (tunnel->paths[i]->activated) {
tb_path_deactivate(tunnel->paths[i]);
tunnel->paths[i]->activated = false;
}
}
if (tunnel->init) {
res = tunnel->init(tunnel);
if (res)
return res;
}
for (i = 0; i < tunnel->npaths; i++) {
res = tb_path_activate(tunnel->paths[i]);
if (res)
goto err;
}
if (tunnel->activate) {
res = tunnel->activate(tunnel, true);
if (res)
goto err;
}
return 0;
err:
tb_tunnel_warn(tunnel, "activation failed\n");
tb_tunnel_deactivate(tunnel);
return res;
}
/**
* tb_tunnel_activate() - activate a tunnel
* @tunnel: Tunnel to activate
*
* Return: Returns 0 on success or an error code on failure.
*/
int tb_tunnel_activate(struct tb_tunnel *tunnel)
{
int i;
for (i = 0; i < tunnel->npaths; i++) {
if (tunnel->paths[i]->activated) {
tb_tunnel_WARN(tunnel,
"trying to activate an already activated tunnel\n");
return -EINVAL;
}
}
return tb_tunnel_restart(tunnel);
}
/**
* tb_tunnel_deactivate() - deactivate a tunnel
* @tunnel: Tunnel to deactivate
*/
void tb_tunnel_deactivate(struct tb_tunnel *tunnel)
{
int i;
tb_tunnel_dbg(tunnel, "deactivating\n");
if (tunnel->activate)
tunnel->activate(tunnel, false);
for (i = 0; i < tunnel->npaths; i++) {
if (tunnel->paths[i] && tunnel->paths[i]->activated)
tb_path_deactivate(tunnel->paths[i]);
}
}
/**
* tb_tunnel_port_on_path() - Does the tunnel go through port
* @tunnel: Tunnel to check
* @port: Port to check
*
* Returns true if @tunnel goes through @port (direction does not matter),
* false otherwise.
*/
bool tb_tunnel_port_on_path(const struct tb_tunnel *tunnel,
const struct tb_port *port)
{
int i;
for (i = 0; i < tunnel->npaths; i++) {
if (!tunnel->paths[i])
continue;
if (tb_path_port_on_path(tunnel->paths[i], port))
return true;
}
return false;
}
static bool tb_tunnel_is_active(const struct tb_tunnel *tunnel)
{
int i;
for (i = 0; i < tunnel->npaths; i++) {
if (!tunnel->paths[i])
return false;
if (!tunnel->paths[i]->activated)
return false;
}
return true;
}
/**
* tb_tunnel_maximum_bandwidth() - Return maximum possible bandwidth
* @tunnel: Tunnel to check
* @max_up: Maximum upstream bandwidth in Mb/s
* @max_down: Maximum downstream bandwidth in Mb/s
*
* Returns maximum possible bandwidth this tunnel can go if not limited
* by other bandwidth clients. If the tunnel does not support this
* returns %-EOPNOTSUPP.
*/
int tb_tunnel_maximum_bandwidth(struct tb_tunnel *tunnel, int *max_up,
int *max_down)
{
if (!tb_tunnel_is_active(tunnel))
return -EINVAL;
if (tunnel->maximum_bandwidth)
return tunnel->maximum_bandwidth(tunnel, max_up, max_down);
return -EOPNOTSUPP;
}
/**
* tb_tunnel_allocated_bandwidth() - Return bandwidth allocated for the tunnel
* @tunnel: Tunnel to check
* @allocated_up: Currently allocated upstream bandwidth in Mb/s is stored here
* @allocated_down: Currently allocated downstream bandwidth in Mb/s is
* stored here
*
* Returns the bandwidth allocated for the tunnel. This may be higher
* than what the tunnel actually consumes.
*/
int tb_tunnel_allocated_bandwidth(struct tb_tunnel *tunnel, int *allocated_up,
int *allocated_down)
{
if (!tb_tunnel_is_active(tunnel))
return -EINVAL;
if (tunnel->allocated_bandwidth)
return tunnel->allocated_bandwidth(tunnel, allocated_up,
allocated_down);
return -EOPNOTSUPP;
}
/**
* tb_tunnel_alloc_bandwidth() - Change tunnel bandwidth allocation
* @tunnel: Tunnel whose bandwidth allocation to change
* @alloc_up: New upstream bandwidth in Mb/s
* @alloc_down: New downstream bandwidth in Mb/s
*
* Tries to change tunnel bandwidth allocation. If succeeds returns %0
* and updates @alloc_up and @alloc_down to that was actually allocated
* (it may not be the same as passed originally). Returns negative errno
* in case of failure.
*/
int tb_tunnel_alloc_bandwidth(struct tb_tunnel *tunnel, int *alloc_up,
int *alloc_down)
{
if (!tb_tunnel_is_active(tunnel))
return -EINVAL;
if (tunnel->alloc_bandwidth)
return tunnel->alloc_bandwidth(tunnel, alloc_up, alloc_down);
return -EOPNOTSUPP;
}
/**
* tb_tunnel_consumed_bandwidth() - Return bandwidth consumed by the tunnel
* @tunnel: Tunnel to check
* @consumed_up: Consumed bandwidth in Mb/s from @dst_port to @src_port.
* Can be %NULL.
* @consumed_down: Consumed bandwidth in Mb/s from @src_port to @dst_port.
* Can be %NULL.
*
* Stores the amount of isochronous bandwidth @tunnel consumes in
* @consumed_up and @consumed_down. In case of success returns %0,
* negative errno otherwise.
*/
int tb_tunnel_consumed_bandwidth(struct tb_tunnel *tunnel, int *consumed_up,
int *consumed_down)
{
int up_bw = 0, down_bw = 0;
if (!tb_tunnel_is_active(tunnel))
goto out;
if (tunnel->consumed_bandwidth) {
int ret;
ret = tunnel->consumed_bandwidth(tunnel, &up_bw, &down_bw);
if (ret)
return ret;
tb_tunnel_dbg(tunnel, "consumed bandwidth %d/%d Mb/s\n", up_bw,
down_bw);
}
out:
if (consumed_up)
*consumed_up = up_bw;
if (consumed_down)
*consumed_down = down_bw;
return 0;
}
/**
* tb_tunnel_release_unused_bandwidth() - Release unused bandwidth
* @tunnel: Tunnel whose unused bandwidth to release
*
* If tunnel supports dynamic bandwidth management (USB3 tunnels at the
* moment) this function makes it to release all the unused bandwidth.
*
* Returns %0 in case of success and negative errno otherwise.
*/
int tb_tunnel_release_unused_bandwidth(struct tb_tunnel *tunnel)
{
if (!tb_tunnel_is_active(tunnel))
return 0;
if (tunnel->release_unused_bandwidth) {
int ret;
ret = tunnel->release_unused_bandwidth(tunnel);
if (ret)
return ret;
}
return 0;
}
/**
* tb_tunnel_reclaim_available_bandwidth() - Reclaim available bandwidth
* @tunnel: Tunnel reclaiming available bandwidth
* @available_up: Available upstream bandwidth (in Mb/s)
* @available_down: Available downstream bandwidth (in Mb/s)
*
* Reclaims bandwidth from @available_up and @available_down and updates
* the variables accordingly (e.g decreases both according to what was
* reclaimed by the tunnel). If nothing was reclaimed the values are
* kept as is.
*/
void tb_tunnel_reclaim_available_bandwidth(struct tb_tunnel *tunnel,
int *available_up,
int *available_down)
{
if (!tb_tunnel_is_active(tunnel))
return;
if (tunnel->reclaim_available_bandwidth)
tunnel->reclaim_available_bandwidth(tunnel, available_up,
available_down);
}
const char *tb_tunnel_type_name(const struct tb_tunnel *tunnel)
{
return tb_tunnel_names[tunnel->type];
}
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