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-rw-r--r--drivers/thunderbolt/path.c42
-rw-r--r--drivers/thunderbolt/tb.c68
-rw-r--r--drivers/thunderbolt/tb.h5
-rw-r--r--drivers/thunderbolt/tunnel.c27
-rw-r--r--drivers/thunderbolt/tunnel.h9
5 files changed, 104 insertions, 47 deletions
diff --git a/drivers/thunderbolt/path.c b/drivers/thunderbolt/path.c
index 564e2f42cebd..299712accfe9 100644
--- a/drivers/thunderbolt/path.c
+++ b/drivers/thunderbolt/path.c
@@ -85,11 +85,12 @@ static int tb_path_find_src_hopid(struct tb_port *src,
* @dst_hopid: HopID to the @dst (%-1 if don't care)
* @last: Last port is filled here if not %NULL
* @name: Name of the path
+ * @alloc_hopid: Allocate HopIDs for the ports
*
* Follows a path starting from @src and @src_hopid to the last output
- * port of the path. Allocates HopIDs for the visited ports. Call
- * tb_path_free() to release the path and allocated HopIDs when the path
- * is not needed anymore.
+ * port of the path. Allocates HopIDs for the visited ports (if
+ * @alloc_hopid is true). Call tb_path_free() to release the path and
+ * allocated HopIDs when the path is not needed anymore.
*
* Note function discovers also incomplete paths so caller should check
* that the @dst port is the expected one. If it is not, the path can be
@@ -99,7 +100,8 @@ static int tb_path_find_src_hopid(struct tb_port *src,
*/
struct tb_path *tb_path_discover(struct tb_port *src, int src_hopid,
struct tb_port *dst, int dst_hopid,
- struct tb_port **last, const char *name)
+ struct tb_port **last, const char *name,
+ bool alloc_hopid)
{
struct tb_port *out_port;
struct tb_regs_hop hop;
@@ -156,6 +158,7 @@ struct tb_path *tb_path_discover(struct tb_port *src, int src_hopid,
path->tb = src->sw->tb;
path->path_length = num_hops;
path->activated = true;
+ path->alloc_hopid = alloc_hopid;
path->hops = kcalloc(num_hops, sizeof(*path->hops), GFP_KERNEL);
if (!path->hops) {
@@ -177,13 +180,14 @@ struct tb_path *tb_path_discover(struct tb_port *src, int src_hopid,
goto err;
}
- if (tb_port_alloc_in_hopid(p, h, h) < 0)
+ if (alloc_hopid && tb_port_alloc_in_hopid(p, h, h) < 0)
goto err;
out_port = &sw->ports[hop.out_port];
next_hop = hop.next_hop;
- if (tb_port_alloc_out_hopid(out_port, next_hop, next_hop) < 0) {
+ if (alloc_hopid &&
+ tb_port_alloc_out_hopid(out_port, next_hop, next_hop) < 0) {
tb_port_release_in_hopid(p, h);
goto err;
}
@@ -263,6 +267,8 @@ struct tb_path *tb_path_alloc(struct tb *tb, struct tb_port *src, int src_hopid,
return NULL;
}
+ path->alloc_hopid = true;
+
in_hopid = src_hopid;
out_port = NULL;
@@ -345,17 +351,19 @@ err:
*/
void tb_path_free(struct tb_path *path)
{
- int i;
-
- for (i = 0; i < path->path_length; i++) {
- const struct tb_path_hop *hop = &path->hops[i];
-
- if (hop->in_port)
- tb_port_release_in_hopid(hop->in_port,
- hop->in_hop_index);
- if (hop->out_port)
- tb_port_release_out_hopid(hop->out_port,
- hop->next_hop_index);
+ if (path->alloc_hopid) {
+ int i;
+
+ for (i = 0; i < path->path_length; i++) {
+ const struct tb_path_hop *hop = &path->hops[i];
+
+ if (hop->in_port)
+ tb_port_release_in_hopid(hop->in_port,
+ hop->in_hop_index);
+ if (hop->out_port)
+ tb_port_release_out_hopid(hop->out_port,
+ hop->next_hop_index);
+ }
}
kfree(path->hops);
diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c
index 2897a77d44c3..a231191b06c6 100644
--- a/drivers/thunderbolt/tb.c
+++ b/drivers/thunderbolt/tb.c
@@ -105,10 +105,11 @@ static void tb_remove_dp_resources(struct tb_switch *sw)
}
}
-static void tb_discover_tunnels(struct tb_switch *sw)
+static void tb_switch_discover_tunnels(struct tb_switch *sw,
+ struct list_head *list,
+ bool alloc_hopids)
{
struct tb *tb = sw->tb;
- struct tb_cm *tcm = tb_priv(tb);
struct tb_port *port;
tb_switch_for_each_port(sw, port) {
@@ -116,24 +117,41 @@ static void tb_discover_tunnels(struct tb_switch *sw)
switch (port->config.type) {
case TB_TYPE_DP_HDMI_IN:
- tunnel = tb_tunnel_discover_dp(tb, port);
+ tunnel = tb_tunnel_discover_dp(tb, port, alloc_hopids);
break;
case TB_TYPE_PCIE_DOWN:
- tunnel = tb_tunnel_discover_pci(tb, port);
+ tunnel = tb_tunnel_discover_pci(tb, port, alloc_hopids);
break;
case TB_TYPE_USB3_DOWN:
- tunnel = tb_tunnel_discover_usb3(tb, port);
+ tunnel = tb_tunnel_discover_usb3(tb, port, alloc_hopids);
break;
default:
break;
}
- if (!tunnel)
- continue;
+ if (tunnel)
+ list_add_tail(&tunnel->list, list);
+ }
+ tb_switch_for_each_port(sw, port) {
+ if (tb_port_has_remote(port)) {
+ tb_switch_discover_tunnels(port->remote->sw, list,
+ alloc_hopids);
+ }
+ }
+}
+
+static void tb_discover_tunnels(struct tb *tb)
+{
+ struct tb_cm *tcm = tb_priv(tb);
+ struct tb_tunnel *tunnel;
+
+ tb_switch_discover_tunnels(tb->root_switch, &tcm->tunnel_list, true);
+
+ list_for_each_entry(tunnel, &tcm->tunnel_list, list) {
if (tb_tunnel_is_pci(tunnel)) {
struct tb_switch *parent = tunnel->dst_port->sw;
@@ -146,13 +164,6 @@ static void tb_discover_tunnels(struct tb_switch *sw)
pm_runtime_get_sync(&tunnel->src_port->sw->dev);
pm_runtime_get_sync(&tunnel->dst_port->sw->dev);
}
-
- list_add_tail(&tunnel->list, &tcm->tunnel_list);
- }
-
- tb_switch_for_each_port(sw, port) {
- if (tb_port_has_remote(port))
- tb_discover_tunnels(port->remote->sw);
}
}
@@ -1369,7 +1380,7 @@ static int tb_start(struct tb *tb)
/* Full scan to discover devices added before the driver was loaded. */
tb_scan_switch(tb->root_switch);
/* Find out tunnels created by the boot firmware */
- tb_discover_tunnels(tb->root_switch);
+ tb_discover_tunnels(tb);
/*
* If the boot firmware did not create USB 3.x tunnels create them
* now for the whole topology.
@@ -1429,6 +1440,8 @@ static int tb_resume_noirq(struct tb *tb)
{
struct tb_cm *tcm = tb_priv(tb);
struct tb_tunnel *tunnel, *n;
+ unsigned int usb3_delay = 0;
+ LIST_HEAD(tunnels);
tb_dbg(tb, "resuming...\n");
@@ -1439,8 +1452,31 @@ static int tb_resume_noirq(struct tb *tb)
tb_free_invalid_tunnels(tb);
tb_free_unplugged_children(tb->root_switch);
tb_restore_children(tb->root_switch);
- list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list)
+
+ /*
+ * If we get here from suspend to disk the boot firmware or the
+ * restore kernel might have created tunnels of its own. Since
+ * we cannot be sure they are usable for us we find and tear
+ * them down.
+ */
+ tb_switch_discover_tunnels(tb->root_switch, &tunnels, false);
+ list_for_each_entry_safe_reverse(tunnel, n, &tunnels, list) {
+ if (tb_tunnel_is_usb3(tunnel))
+ usb3_delay = 500;
+ tb_tunnel_deactivate(tunnel);
+ tb_tunnel_free(tunnel);
+ }
+
+ /* Re-create our tunnels now */
+ list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) {
+ /* USB3 requires delay before it can be re-activated */
+ if (tb_tunnel_is_usb3(tunnel)) {
+ msleep(usb3_delay);
+ /* Only need to do it once */
+ usb3_delay = 0;
+ }
tb_tunnel_restart(tunnel);
+ }
if (!list_empty(&tcm->tunnel_list)) {
/*
* the pcie links need some time to get going.
diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h
index 725104c83e3d..3fae40670b72 100644
--- a/drivers/thunderbolt/tb.h
+++ b/drivers/thunderbolt/tb.h
@@ -354,6 +354,7 @@ enum tb_path_port {
* when deactivating this path
* @hops: Path hops
* @path_length: How many hops the path uses
+ * @alloc_hopid: Does this path consume port HopID
*
* A path consists of a number of hops (see &struct tb_path_hop). To
* establish a PCIe tunnel two paths have to be created between the two
@@ -374,6 +375,7 @@ struct tb_path {
bool clear_fc;
struct tb_path_hop *hops;
int path_length;
+ bool alloc_hopid;
};
/* HopIDs 0-7 are reserved by the Thunderbolt protocol */
@@ -957,7 +959,8 @@ int tb_dp_port_enable(struct tb_port *port, bool enable);
struct tb_path *tb_path_discover(struct tb_port *src, int src_hopid,
struct tb_port *dst, int dst_hopid,
- struct tb_port **last, const char *name);
+ struct tb_port **last, const char *name,
+ bool alloc_hopid);
struct tb_path *tb_path_alloc(struct tb *tb, struct tb_port *src, int src_hopid,
struct tb_port *dst, int dst_hopid, int link_nr,
const char *name);
diff --git a/drivers/thunderbolt/tunnel.c b/drivers/thunderbolt/tunnel.c
index bb5cc480fc9a..a473cc7d9a8d 100644
--- a/drivers/thunderbolt/tunnel.c
+++ b/drivers/thunderbolt/tunnel.c
@@ -207,12 +207,14 @@ static int tb_pci_init_path(struct tb_path *path)
* 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)
+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;
@@ -233,7 +235,7 @@ struct tb_tunnel *tb_tunnel_discover_pci(struct tb *tb, struct tb_port *down)
* case.
*/
path = tb_path_discover(down, TB_PCI_HOPID, NULL, -1,
- &tunnel->dst_port, "PCIe Up");
+ &tunnel->dst_port, "PCIe Up", alloc_hopid);
if (!path) {
/* Just disable the downstream port */
tb_pci_port_enable(down, false);
@@ -244,7 +246,7 @@ struct tb_tunnel *tb_tunnel_discover_pci(struct tb *tb, struct tb_port *down)
goto err_free;
path = tb_path_discover(tunnel->dst_port, -1, down, TB_PCI_HOPID, NULL,
- "PCIe Down");
+ "PCIe Down", alloc_hopid);
if (!path)
goto err_deactivate;
tunnel->paths[TB_PCI_PATH_DOWN] = path;
@@ -761,6 +763,7 @@ static int tb_dp_init_video_path(struct tb_path *path)
* 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
@@ -768,7 +771,8 @@ static int tb_dp_init_video_path(struct tb_path *path)
*
* Return: DP tunnel or %NULL if no tunnel found.
*/
-struct tb_tunnel *tb_tunnel_discover_dp(struct tb *tb, struct tb_port *in)
+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;
@@ -787,7 +791,7 @@ struct tb_tunnel *tb_tunnel_discover_dp(struct tb *tb, struct tb_port *in)
tunnel->src_port = in;
path = tb_path_discover(in, TB_DP_VIDEO_HOPID, NULL, -1,
- &tunnel->dst_port, "Video");
+ &tunnel->dst_port, "Video", alloc_hopid);
if (!path) {
/* Just disable the DP IN port */
tb_dp_port_enable(in, false);
@@ -797,14 +801,15 @@ struct tb_tunnel *tb_tunnel_discover_dp(struct tb *tb, struct tb_port *in)
if (tb_dp_init_video_path(tunnel->paths[TB_DP_VIDEO_PATH_OUT]))
goto err_free;
- path = tb_path_discover(in, TB_DP_AUX_TX_HOPID, NULL, -1, NULL, "AUX TX");
+ 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]);
path = tb_path_discover(tunnel->dst_port, -1, in, TB_DP_AUX_RX_HOPID,
- &port, "AUX RX");
+ &port, "AUX RX", alloc_hopid);
if (!path)
goto err_deactivate;
tunnel->paths[TB_DP_AUX_PATH_IN] = path;
@@ -1343,12 +1348,14 @@ static void tb_usb3_init_path(struct tb_path *path)
* 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)
+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;
@@ -1369,7 +1376,7 @@ struct tb_tunnel *tb_tunnel_discover_usb3(struct tb *tb, struct tb_port *down)
* case.
*/
path = tb_path_discover(down, TB_USB3_HOPID, NULL, -1,
- &tunnel->dst_port, "USB3 Down");
+ &tunnel->dst_port, "USB3 Down", alloc_hopid);
if (!path) {
/* Just disable the downstream port */
tb_usb3_port_enable(down, false);
@@ -1379,7 +1386,7 @@ struct tb_tunnel *tb_tunnel_discover_usb3(struct tb *tb, struct tb_port *down)
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");
+ "USB3 Up", alloc_hopid);
if (!path)
goto err_deactivate;
tunnel->paths[TB_USB3_PATH_UP] = path;
diff --git a/drivers/thunderbolt/tunnel.h b/drivers/thunderbolt/tunnel.h
index eea14e24f7e0..03e56076b5bc 100644
--- a/drivers/thunderbolt/tunnel.h
+++ b/drivers/thunderbolt/tunnel.h
@@ -64,10 +64,12 @@ struct tb_tunnel {
int allocated_down;
};
-struct tb_tunnel *tb_tunnel_discover_pci(struct tb *tb, struct tb_port *down);
+struct tb_tunnel *tb_tunnel_discover_pci(struct tb *tb, struct tb_port *down,
+ bool alloc_hopid);
struct tb_tunnel *tb_tunnel_alloc_pci(struct tb *tb, struct tb_port *up,
struct tb_port *down);
-struct tb_tunnel *tb_tunnel_discover_dp(struct tb *tb, struct tb_port *in);
+struct tb_tunnel *tb_tunnel_discover_dp(struct tb *tb, struct tb_port *in,
+ bool alloc_hopid);
struct tb_tunnel *tb_tunnel_alloc_dp(struct tb *tb, struct tb_port *in,
struct tb_port *out, int max_up,
int max_down);
@@ -77,7 +79,8 @@ struct tb_tunnel *tb_tunnel_alloc_dma(struct tb *tb, struct tb_port *nhi,
int receive_ring);
bool tb_tunnel_match_dma(const struct tb_tunnel *tunnel, int transmit_path,
int transmit_ring, int receive_path, int receive_ring);
-struct tb_tunnel *tb_tunnel_discover_usb3(struct tb *tb, struct tb_port *down);
+struct tb_tunnel *tb_tunnel_discover_usb3(struct tb *tb, struct tb_port *down,
+ bool alloc_hopid);
struct tb_tunnel *tb_tunnel_alloc_usb3(struct tb *tb, struct tb_port *up,
struct tb_port *down, int max_up,
int max_down);
generated by cgit (git 2.34.1) at 2025-02-24 10:17:47 +0000