mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-12 23:46:40 +07:00
thunderbolt: Add suspend/hibernate support
We use _noirq since we have to restore the pci tunnels before the pci core wakes the tunneled devices. Signed-off-by: Andreas Noever <andreas.noever@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
c90553b3c4
commit
23dd5bb49d
@ -7,6 +7,7 @@
|
||||
* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
|
||||
*/
|
||||
|
||||
#include <linux/pm_runtime.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/errno.h>
|
||||
#include <linux/pci.h>
|
||||
@ -492,6 +493,22 @@ static irqreturn_t nhi_msi(int irq, void *data)
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static int nhi_suspend_noirq(struct device *dev)
|
||||
{
|
||||
struct pci_dev *pdev = to_pci_dev(dev);
|
||||
struct tb *tb = pci_get_drvdata(pdev);
|
||||
thunderbolt_suspend(tb);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int nhi_resume_noirq(struct device *dev)
|
||||
{
|
||||
struct pci_dev *pdev = to_pci_dev(dev);
|
||||
struct tb *tb = pci_get_drvdata(pdev);
|
||||
thunderbolt_resume(tb);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void nhi_shutdown(struct tb_nhi *nhi)
|
||||
{
|
||||
int i;
|
||||
@ -600,6 +617,21 @@ static void nhi_remove(struct pci_dev *pdev)
|
||||
nhi_shutdown(nhi);
|
||||
}
|
||||
|
||||
/*
|
||||
* The tunneled pci bridges are siblings of us. Use resume_noirq to reenable
|
||||
* the tunnels asap. A corresponding pci quirk blocks the downstream bridges
|
||||
* resume_noirq until we are done.
|
||||
*/
|
||||
static const struct dev_pm_ops nhi_pm_ops = {
|
||||
.suspend_noirq = nhi_suspend_noirq,
|
||||
.resume_noirq = nhi_resume_noirq,
|
||||
.freeze_noirq = nhi_suspend_noirq, /*
|
||||
* we just disable hotplug, the
|
||||
* pci-tunnels stay alive.
|
||||
*/
|
||||
.restore_noirq = nhi_resume_noirq,
|
||||
};
|
||||
|
||||
struct pci_device_id nhi_ids[] = {
|
||||
/*
|
||||
* We have to specify class, the TB bridges use the same device and
|
||||
@ -626,6 +658,7 @@ static struct pci_driver nhi_driver = {
|
||||
.id_table = nhi_ids,
|
||||
.probe = nhi_probe,
|
||||
.remove = nhi_remove,
|
||||
.driver.pm = &nhi_pm_ops,
|
||||
};
|
||||
|
||||
static int __init nhi_init(void)
|
||||
|
@ -229,6 +229,30 @@ static void tb_dump_switch(struct tb *tb, struct tb_regs_switch_header *sw)
|
||||
sw->__unknown1, sw->__unknown4);
|
||||
}
|
||||
|
||||
/**
|
||||
* reset_switch() - reconfigure route, enable and send TB_CFG_PKG_RESET
|
||||
*
|
||||
* Return: Returns 0 on success or an error code on failure.
|
||||
*/
|
||||
int tb_switch_reset(struct tb *tb, u64 route)
|
||||
{
|
||||
struct tb_cfg_result res;
|
||||
struct tb_regs_switch_header header = {
|
||||
header.route_hi = route >> 32,
|
||||
header.route_lo = route,
|
||||
header.enabled = true,
|
||||
};
|
||||
tb_info(tb, "resetting switch at %llx\n", route);
|
||||
res.err = tb_cfg_write(tb->ctl, ((u32 *) &header) + 2, route,
|
||||
0, 2, 2, 2);
|
||||
if (res.err)
|
||||
return res.err;
|
||||
res = tb_cfg_reset(tb->ctl, route, TB_CFG_DEFAULT_TIMEOUT);
|
||||
if (res.err > 0)
|
||||
return -EIO;
|
||||
return res.err;
|
||||
}
|
||||
|
||||
struct tb_switch *get_switch_at_route(struct tb_switch *sw, u64 route)
|
||||
{
|
||||
u8 next_port = route; /*
|
||||
@ -412,3 +436,63 @@ void tb_sw_set_unpplugged(struct tb_switch *sw)
|
||||
}
|
||||
}
|
||||
|
||||
int tb_switch_resume(struct tb_switch *sw)
|
||||
{
|
||||
int i, err;
|
||||
u64 uid;
|
||||
tb_sw_info(sw, "resuming switch\n");
|
||||
|
||||
err = tb_eeprom_read_uid(sw, &uid);
|
||||
if (err) {
|
||||
tb_sw_warn(sw, "uid read failed\n");
|
||||
return err;
|
||||
}
|
||||
if (sw->uid != uid) {
|
||||
tb_sw_info(sw,
|
||||
"changed while suspended (uid %#llx -> %#llx)\n",
|
||||
sw->uid, uid);
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
/* upload configuration */
|
||||
err = tb_sw_write(sw, 1 + (u32 *) &sw->config, TB_CFG_SWITCH, 1, 3);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
err = tb_plug_events_active(sw, true);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
/* check for surviving downstream switches */
|
||||
for (i = 1; i <= sw->config.max_port_number; i++) {
|
||||
struct tb_port *port = &sw->ports[i];
|
||||
if (tb_is_upstream_port(port))
|
||||
continue;
|
||||
if (!port->remote)
|
||||
continue;
|
||||
if (tb_wait_for_port(port, true) <= 0
|
||||
|| tb_switch_resume(port->remote->sw)) {
|
||||
tb_port_warn(port,
|
||||
"lost during suspend, disconnecting\n");
|
||||
tb_sw_set_unpplugged(port->remote->sw);
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
void tb_switch_suspend(struct tb_switch *sw)
|
||||
{
|
||||
int i, err;
|
||||
err = tb_plug_events_active(sw, false);
|
||||
if (err)
|
||||
return;
|
||||
|
||||
for (i = 1; i <= sw->config.max_port_number; i++) {
|
||||
if (!tb_is_upstream_port(&sw->ports[i]) && sw->ports[i].remote)
|
||||
tb_switch_suspend(sw->ports[i].remote->sw);
|
||||
}
|
||||
/*
|
||||
* TODO: invoke tb_cfg_prepare_to_sleep here? does not seem to have any
|
||||
* effect?
|
||||
*/
|
||||
}
|
||||
|
@ -68,6 +68,28 @@ static void tb_free_invalid_tunnels(struct tb *tb)
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* tb_free_unplugged_children() - traverse hierarchy and free unplugged switches
|
||||
*/
|
||||
static void tb_free_unplugged_children(struct tb_switch *sw)
|
||||
{
|
||||
int i;
|
||||
for (i = 1; i <= sw->config.max_port_number; i++) {
|
||||
struct tb_port *port = &sw->ports[i];
|
||||
if (tb_is_upstream_port(port))
|
||||
continue;
|
||||
if (!port->remote)
|
||||
continue;
|
||||
if (port->remote->sw->is_unplugged) {
|
||||
tb_switch_free(port->remote->sw);
|
||||
port->remote = NULL;
|
||||
} else {
|
||||
tb_free_unplugged_children(port->remote->sw);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* find_pci_up_port() - return the first PCIe up port on @sw or NULL
|
||||
*/
|
||||
@ -368,3 +390,42 @@ struct tb *thunderbolt_alloc_and_start(struct tb_nhi *nhi)
|
||||
return NULL;
|
||||
}
|
||||
|
||||
void thunderbolt_suspend(struct tb *tb)
|
||||
{
|
||||
tb_info(tb, "suspending...\n");
|
||||
mutex_lock(&tb->lock);
|
||||
tb_switch_suspend(tb->root_switch);
|
||||
tb_ctl_stop(tb->ctl);
|
||||
tb->hotplug_active = false; /* signal tb_handle_hotplug to quit */
|
||||
mutex_unlock(&tb->lock);
|
||||
tb_info(tb, "suspend finished\n");
|
||||
}
|
||||
|
||||
void thunderbolt_resume(struct tb *tb)
|
||||
{
|
||||
struct tb_pci_tunnel *tunnel, *n;
|
||||
tb_info(tb, "resuming...\n");
|
||||
mutex_lock(&tb->lock);
|
||||
tb_ctl_start(tb->ctl);
|
||||
|
||||
/* remove any pci devices the firmware might have setup */
|
||||
tb_switch_reset(tb, 0);
|
||||
|
||||
tb_switch_resume(tb->root_switch);
|
||||
tb_free_invalid_tunnels(tb);
|
||||
tb_free_unplugged_children(tb->root_switch);
|
||||
list_for_each_entry_safe(tunnel, n, &tb->tunnel_list, list)
|
||||
tb_pci_restart(tunnel);
|
||||
if (!list_empty(&tb->tunnel_list)) {
|
||||
/*
|
||||
* the pcie links need some time to get going.
|
||||
* 100ms works for me...
|
||||
*/
|
||||
tb_info(tb, "tunnels restarted, sleeping for 100ms\n");
|
||||
msleep(100);
|
||||
}
|
||||
/* Allow tb_handle_hotplug to progress events */
|
||||
tb->hotplug_active = true;
|
||||
mutex_unlock(&tb->lock);
|
||||
tb_info(tb, "resume finished\n");
|
||||
}
|
||||
|
@ -214,9 +214,14 @@ static inline int tb_port_write(struct tb_port *port, void *buffer,
|
||||
|
||||
struct tb *thunderbolt_alloc_and_start(struct tb_nhi *nhi);
|
||||
void thunderbolt_shutdown_and_free(struct tb *tb);
|
||||
void thunderbolt_suspend(struct tb *tb);
|
||||
void thunderbolt_resume(struct tb *tb);
|
||||
|
||||
struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route);
|
||||
void tb_switch_free(struct tb_switch *sw);
|
||||
void tb_switch_suspend(struct tb_switch *sw);
|
||||
int tb_switch_resume(struct tb_switch *sw);
|
||||
int tb_switch_reset(struct tb *tb, u64 route);
|
||||
void tb_sw_set_unpplugged(struct tb_switch *sw);
|
||||
struct tb_switch *get_switch_at_route(struct tb_switch *sw, u64 route);
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user