277 lines
7.8 KiB
Diff
277 lines
7.8 KiB
Diff
From: Andreas Noever <andreas.noever@gmail.com>
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Date: Tue, 3 Jun 2014 22:04:12 +0200
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Subject: [13/31] thunderbolt: Add suspend/hibernate support
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Origin: https://git.kernel.org/linus/23dd5bb49d986f37977ed80dd2ca65040ead4392
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We use _noirq since we have to restore the pci tunnels before the pci
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core wakes the tunneled devices.
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Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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drivers/thunderbolt/nhi.c | 33 +++++++++++++++++
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drivers/thunderbolt/switch.c | 84 ++++++++++++++++++++++++++++++++++++++++++++
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drivers/thunderbolt/tb.c | 61 ++++++++++++++++++++++++++++++++
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drivers/thunderbolt/tb.h | 5 +++
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4 files changed, 183 insertions(+)
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diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c
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index d2b9ce8..346b41e 100644
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--- a/drivers/thunderbolt/nhi.c
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+++ b/drivers/thunderbolt/nhi.c
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@@ -7,6 +7,7 @@
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* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
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*/
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+#include <linux/pm_runtime.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/pci.h>
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@@ -492,6 +493,22 @@ static irqreturn_t nhi_msi(int irq, void *data)
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return IRQ_HANDLED;
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}
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+static int nhi_suspend_noirq(struct device *dev)
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+{
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+ struct pci_dev *pdev = to_pci_dev(dev);
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+ struct tb *tb = pci_get_drvdata(pdev);
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+ thunderbolt_suspend(tb);
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+ return 0;
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+}
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+
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+static int nhi_resume_noirq(struct device *dev)
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+{
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+ struct pci_dev *pdev = to_pci_dev(dev);
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+ struct tb *tb = pci_get_drvdata(pdev);
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+ thunderbolt_resume(tb);
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+ return 0;
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+}
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+
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static void nhi_shutdown(struct tb_nhi *nhi)
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{
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int i;
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@@ -600,6 +617,21 @@ static void nhi_remove(struct pci_dev *pdev)
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nhi_shutdown(nhi);
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}
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+/*
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+ * The tunneled pci bridges are siblings of us. Use resume_noirq to reenable
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+ * the tunnels asap. A corresponding pci quirk blocks the downstream bridges
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+ * resume_noirq until we are done.
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+ */
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+static const struct dev_pm_ops nhi_pm_ops = {
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+ .suspend_noirq = nhi_suspend_noirq,
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+ .resume_noirq = nhi_resume_noirq,
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+ .freeze_noirq = nhi_suspend_noirq, /*
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+ * we just disable hotplug, the
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+ * pci-tunnels stay alive.
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+ */
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+ .restore_noirq = nhi_resume_noirq,
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+};
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+
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struct pci_device_id nhi_ids[] = {
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/*
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* We have to specify class, the TB bridges use the same device and
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@@ -626,6 +658,7 @@ static struct pci_driver nhi_driver = {
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.id_table = nhi_ids,
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.probe = nhi_probe,
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.remove = nhi_remove,
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+ .driver.pm = &nhi_pm_ops,
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};
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static int __init nhi_init(void)
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diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
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index aeb5c30..c2a24b6 100644
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--- a/drivers/thunderbolt/switch.c
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+++ b/drivers/thunderbolt/switch.c
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@@ -229,6 +229,30 @@ static void tb_dump_switch(struct tb *tb, struct tb_regs_switch_header *sw)
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sw->__unknown1, sw->__unknown4);
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}
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+/**
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+ * reset_switch() - reconfigure route, enable and send TB_CFG_PKG_RESET
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+ *
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+ * Return: Returns 0 on success or an error code on failure.
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+ */
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+int tb_switch_reset(struct tb *tb, u64 route)
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+{
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+ struct tb_cfg_result res;
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+ struct tb_regs_switch_header header = {
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+ header.route_hi = route >> 32,
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+ header.route_lo = route,
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+ header.enabled = true,
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+ };
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+ tb_info(tb, "resetting switch at %llx\n", route);
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+ res.err = tb_cfg_write(tb->ctl, ((u32 *) &header) + 2, route,
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+ 0, 2, 2, 2);
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+ if (res.err)
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+ return res.err;
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+ res = tb_cfg_reset(tb->ctl, route, TB_CFG_DEFAULT_TIMEOUT);
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+ if (res.err > 0)
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+ return -EIO;
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+ return res.err;
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+}
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+
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struct tb_switch *get_switch_at_route(struct tb_switch *sw, u64 route)
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{
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u8 next_port = route; /*
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@@ -412,3 +436,63 @@ void tb_sw_set_unpplugged(struct tb_switch *sw)
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}
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}
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+int tb_switch_resume(struct tb_switch *sw)
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+{
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+ int i, err;
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+ u64 uid;
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+ tb_sw_info(sw, "resuming switch\n");
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+
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+ err = tb_eeprom_read_uid(sw, &uid);
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+ if (err) {
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+ tb_sw_warn(sw, "uid read failed\n");
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+ return err;
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+ }
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+ if (sw->uid != uid) {
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+ tb_sw_info(sw,
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+ "changed while suspended (uid %#llx -> %#llx)\n",
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+ sw->uid, uid);
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+ return -ENODEV;
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+ }
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+
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+ /* upload configuration */
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+ err = tb_sw_write(sw, 1 + (u32 *) &sw->config, TB_CFG_SWITCH, 1, 3);
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+ if (err)
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+ return err;
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+
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+ err = tb_plug_events_active(sw, true);
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+ if (err)
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+ return err;
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+
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+ /* check for surviving downstream switches */
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+ for (i = 1; i <= sw->config.max_port_number; i++) {
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+ struct tb_port *port = &sw->ports[i];
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+ if (tb_is_upstream_port(port))
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+ continue;
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+ if (!port->remote)
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+ continue;
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+ if (tb_wait_for_port(port, true) <= 0
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+ || tb_switch_resume(port->remote->sw)) {
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+ tb_port_warn(port,
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+ "lost during suspend, disconnecting\n");
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+ tb_sw_set_unpplugged(port->remote->sw);
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+ }
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+ }
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+ return 0;
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+}
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+
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+void tb_switch_suspend(struct tb_switch *sw)
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+{
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+ int i, err;
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+ err = tb_plug_events_active(sw, false);
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+ if (err)
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+ return;
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+
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+ for (i = 1; i <= sw->config.max_port_number; i++) {
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+ if (!tb_is_upstream_port(&sw->ports[i]) && sw->ports[i].remote)
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+ tb_switch_suspend(sw->ports[i].remote->sw);
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+ }
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+ /*
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+ * TODO: invoke tb_cfg_prepare_to_sleep here? does not seem to have any
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+ * effect?
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+ */
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+}
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diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c
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index 177f61d..1aa6dd7 100644
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--- a/drivers/thunderbolt/tb.c
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+++ b/drivers/thunderbolt/tb.c
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@@ -69,6 +69,28 @@ static void tb_free_invalid_tunnels(struct tb *tb)
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}
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/**
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+ * tb_free_unplugged_children() - traverse hierarchy and free unplugged switches
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+ */
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+static void tb_free_unplugged_children(struct tb_switch *sw)
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+{
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+ int i;
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+ for (i = 1; i <= sw->config.max_port_number; i++) {
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+ struct tb_port *port = &sw->ports[i];
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+ if (tb_is_upstream_port(port))
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+ continue;
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+ if (!port->remote)
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+ continue;
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+ if (port->remote->sw->is_unplugged) {
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+ tb_switch_free(port->remote->sw);
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+ port->remote = NULL;
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+ } else {
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+ tb_free_unplugged_children(port->remote->sw);
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+ }
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+ }
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+}
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+
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+
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+/**
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* find_pci_up_port() - return the first PCIe up port on @sw or NULL
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*/
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static struct tb_port *tb_find_pci_up_port(struct tb_switch *sw)
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@@ -368,3 +390,42 @@ err_locked:
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return NULL;
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}
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+void thunderbolt_suspend(struct tb *tb)
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+{
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+ tb_info(tb, "suspending...\n");
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+ mutex_lock(&tb->lock);
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+ tb_switch_suspend(tb->root_switch);
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+ tb_ctl_stop(tb->ctl);
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+ tb->hotplug_active = false; /* signal tb_handle_hotplug to quit */
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+ mutex_unlock(&tb->lock);
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+ tb_info(tb, "suspend finished\n");
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+}
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+
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+void thunderbolt_resume(struct tb *tb)
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+{
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+ struct tb_pci_tunnel *tunnel, *n;
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+ tb_info(tb, "resuming...\n");
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+ mutex_lock(&tb->lock);
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+ tb_ctl_start(tb->ctl);
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+
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+ /* remove any pci devices the firmware might have setup */
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+ tb_switch_reset(tb, 0);
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+
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+ tb_switch_resume(tb->root_switch);
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+ tb_free_invalid_tunnels(tb);
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+ tb_free_unplugged_children(tb->root_switch);
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+ list_for_each_entry_safe(tunnel, n, &tb->tunnel_list, list)
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+ tb_pci_restart(tunnel);
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+ if (!list_empty(&tb->tunnel_list)) {
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+ /*
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+ * the pcie links need some time to get going.
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+ * 100ms works for me...
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+ */
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+ tb_info(tb, "tunnels restarted, sleeping for 100ms\n");
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+ msleep(100);
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+ }
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+ /* Allow tb_handle_hotplug to progress events */
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+ tb->hotplug_active = true;
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+ mutex_unlock(&tb->lock);
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+ tb_info(tb, "resume finished\n");
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+}
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diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h
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index a89087f..63e89d0 100644
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--- a/drivers/thunderbolt/tb.h
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+++ b/drivers/thunderbolt/tb.h
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@@ -214,9 +214,14 @@ static inline int tb_port_write(struct tb_port *port, void *buffer,
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struct tb *thunderbolt_alloc_and_start(struct tb_nhi *nhi);
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void thunderbolt_shutdown_and_free(struct tb *tb);
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+void thunderbolt_suspend(struct tb *tb);
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+void thunderbolt_resume(struct tb *tb);
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struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route);
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void tb_switch_free(struct tb_switch *sw);
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+void tb_switch_suspend(struct tb_switch *sw);
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+int tb_switch_resume(struct tb_switch *sw);
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+int tb_switch_reset(struct tb *tb, u64 route);
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void tb_sw_set_unpplugged(struct tb_switch *sw);
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struct tb_switch *get_switch_at_route(struct tb_switch *sw, u64 route);
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