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-rw-r--r--drivers/thunderbolt/tb.h14
-rw-r--r--drivers/thunderbolt/tunnel.c404
-rw-r--r--drivers/thunderbolt/tunnel.h2
3 files changed, 346 insertions, 74 deletions
diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h
index e2f304d4a65d..89e38aeea52b 100644
--- a/drivers/thunderbolt/tb.h
+++ b/drivers/thunderbolt/tb.h
@@ -213,6 +213,8 @@ struct tb_switch {
* @list: Used to link ports to DP resources list
* @total_credits: Total number of buffers available for this port
* @ctl_credits: Buffers reserved for control path
+ * @dma_credits: Number of credits allocated for DMA tunneling for all
+ * DMA paths through this port.
*
* In USB4 terminology this structure represents an adapter (protocol or
* lane adapter).
@@ -236,6 +238,7 @@ struct tb_port {
struct list_head list;
unsigned int total_credits;
unsigned int ctl_credits;
+ unsigned int dma_credits;
};
/**
@@ -941,6 +944,17 @@ bool tb_path_is_invalid(struct tb_path *path);
bool tb_path_port_on_path(const struct tb_path *path,
const struct tb_port *port);
+/**
+ * tb_path_for_each_hop() - Iterate over each hop on path
+ * @path: Path whose hops to iterate
+ * @hop: Hop used as iterator
+ *
+ * Iterates over each hop on path.
+ */
+#define tb_path_for_each_hop(path, hop) \
+ for ((hop) = &(path)->hops[0]; \
+ (hop) <= &(path)->hops[(path)->path_length - 1]; (hop)++)
+
int tb_drom_read(struct tb_switch *sw);
int tb_drom_read_uid_only(struct tb_switch *sw, u64 *uid);
diff --git a/drivers/thunderbolt/tunnel.c b/drivers/thunderbolt/tunnel.c
index 5be0f31949f1..bb5cc480fc9a 100644
--- a/drivers/thunderbolt/tunnel.c
+++ b/drivers/thunderbolt/tunnel.c
@@ -34,6 +34,16 @@
#define TB_DP_AUX_PATH_OUT 1
#define TB_DP_AUX_PATH_IN 2
+/* 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 14U
+/* Minimum number of credits for DMA path */
+#define TB_MIN_DMA_CREDITS 1U
+
static const char * const tb_tunnel_names[] = { "PCI", "DP", "DMA", "USB3" };
#define __TB_TUNNEL_PRINT(level, tunnel, fmt, arg...) \
@@ -57,6 +67,55 @@ static const char * const tb_tunnel_names[] = { "PCI", "DP", "DMA", "USB3" };
#define tb_tunnel_dbg(tunnel, fmt, arg...) \
__TB_TUNNEL_PRINT(tb_dbg, tunnel, fmt, ##arg)
+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, TB_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.
+ */
+ ndp = (credits - (usb3 + pcie + spare)) /
+ (sw->min_dp_aux_credits + sw->min_dp_main_credits);
+ } 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 struct tb_tunnel *tb_tunnel_alloc(struct tb *tb, size_t npaths,
enum tb_tunnel_type type)
{
@@ -94,24 +153,37 @@ static int tb_pci_activate(struct tb_tunnel *tunnel, bool activate)
return 0;
}
-static int tb_initial_credits(const struct tb_switch *sw)
+static int tb_pci_init_credits(struct tb_path_hop *hop)
{
- /* If the path is complete sw is not NULL */
- if (sw) {
- /* More credits for faster link */
- switch (sw->link_speed * sw->link_width) {
- case 40:
- return 32;
- case 20:
- return 24;
- }
+ 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;
}
- return 16;
+ hop->initial_credits = credits;
+ return 0;
}
-static void tb_pci_init_path(struct tb_path *path)
+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;
@@ -119,10 +191,16 @@ static void tb_pci_init_path(struct tb_path *path)
path->priority = 3;
path->weight = 1;
path->drop_packages = 0;
- path->hops[0].initial_credits = 7;
- if (path->path_length > 1)
- path->hops[1].initial_credits =
- tb_initial_credits(path->hops[1].in_port->sw);
+
+ tb_path_for_each_hop(path, hop) {
+ int ret;
+
+ ret = tb_pci_init_credits(hop);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
}
/**
@@ -162,14 +240,16 @@ struct tb_tunnel *tb_tunnel_discover_pci(struct tb *tb, struct tb_port *down)
goto err_free;
}
tunnel->paths[TB_PCI_PATH_UP] = path;
- tb_pci_init_path(tunnel->paths[TB_PCI_PATH_UP]);
+ 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");
if (!path)
goto err_deactivate;
tunnel->paths[TB_PCI_PATH_DOWN] = path;
- tb_pci_init_path(tunnel->paths[TB_PCI_PATH_DOWN]);
+ 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)) {
@@ -227,23 +307,25 @@ struct tb_tunnel *tb_tunnel_alloc_pci(struct tb *tb, struct tb_port *up,
path = tb_path_alloc(tb, down, TB_PCI_HOPID, up, TB_PCI_HOPID, 0,
"PCIe Down");
- if (!path) {
- tb_tunnel_free(tunnel);
- return NULL;
- }
- tb_pci_init_path(path);
+ 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) {
- tb_tunnel_free(tunnel);
- return NULL;
- }
- tb_pci_init_path(path);
+ 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;
}
static bool tb_dp_is_usb4(const struct tb_switch *sw)
@@ -598,9 +680,20 @@ static int tb_dp_consumed_bandwidth(struct tb_tunnel *tunnel, int *consumed_up,
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)
{
- int i;
+ struct tb_path_hop *hop;
path->egress_fc_enable = TB_PATH_SOURCE | TB_PATH_INTERNAL;
path->egress_shared_buffer = TB_PATH_NONE;
@@ -609,13 +702,42 @@ static void tb_dp_init_aux_path(struct tb_path *path)
path->priority = 2;
path->weight = 1;
- for (i = 0; i < path->path_length; i++)
- path->hops[i].initial_credits = 1;
+ tb_path_for_each_hop(path, hop)
+ tb_dp_init_aux_credits(hop);
}
-static void tb_dp_init_video_path(struct tb_path *path, bool discover)
+static int tb_dp_init_video_credits(struct tb_path_hop *hop)
{
- int i;
+ 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)
+{
+ struct tb_path_hop *hop;
path->egress_fc_enable = TB_PATH_NONE;
path->egress_shared_buffer = TB_PATH_NONE;
@@ -624,21 +746,15 @@ static void tb_dp_init_video_path(struct tb_path *path, bool discover)
path->priority = 1;
path->weight = 1;
- for (i = 0; i < path->path_length; i++) {
- u32 nfc_credits = path->hops[i].in_port->config.nfc_credits;
-
- if (discover) {
- path->hops[i].nfc_credits =
- nfc_credits & ADP_CS_4_NFC_BUFFERS_MASK;
- } else {
- u32 max_credits;
+ tb_path_for_each_hop(path, hop) {
+ int ret;
- max_credits = (nfc_credits & ADP_CS_4_TOTAL_BUFFERS_MASK) >>
- ADP_CS_4_TOTAL_BUFFERS_SHIFT;
- /* Leave some credits for AUX path */
- path->hops[i].nfc_credits = min(max_credits - 2, 12U);
- }
+ ret = tb_dp_init_video_credits(hop);
+ if (ret)
+ return ret;
}
+
+ return 0;
}
/**
@@ -678,7 +794,8 @@ struct tb_tunnel *tb_tunnel_discover_dp(struct tb *tb, struct tb_port *in)
goto err_free;
}
tunnel->paths[TB_DP_VIDEO_PATH_OUT] = path;
- tb_dp_init_video_path(tunnel->paths[TB_DP_VIDEO_PATH_OUT], true);
+ 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");
if (!path)
@@ -765,7 +882,7 @@ struct tb_tunnel *tb_tunnel_alloc_dp(struct tb *tb, struct tb_port *in,
1, "Video");
if (!path)
goto err_free;
- tb_dp_init_video_path(path, false);
+ tb_dp_init_video_path(path);
paths[TB_DP_VIDEO_PATH_OUT] = path;
path = tb_path_alloc(tb, in, TB_DP_AUX_TX_HOPID, out,
@@ -789,20 +906,58 @@ err_free:
return NULL;
}
-static u32 tb_dma_credits(struct tb_port *nhi)
+static unsigned int tb_dma_available_credits(const struct tb_port *port)
{
- u32 max_credits;
+ 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;
- max_credits = (nhi->config.nfc_credits & ADP_CS_4_TOTAL_BUFFERS_MASK) >>
- ADP_CS_4_TOTAL_BUFFERS_SHIFT;
- return min(max_credits, 13U);
+ return credits > 0 ? credits : 0;
}
-static void tb_dma_init_path(struct tb_path *path, unsigned int efc, u32 credits)
+static int tb_dma_reserve_credits(struct tb_path_hop *hop, unsigned int credits)
{
- int i;
+ 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 = efc;
+ 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;
@@ -810,8 +965,80 @@ static void tb_dma_init_path(struct tb_path *path, unsigned int efc, u32 credits
path->weight = 1;
path->clear_fc = true;
- for (i = 0; i < path->path_length; i++)
- path->hops[i].initial_credits = credits;
+ /*
+ * 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 = 5;
+ path->weight = 1;
+ 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]);
+ }
}
/**
@@ -836,7 +1063,7 @@ struct tb_tunnel *tb_tunnel_alloc_dma(struct tb *tb, struct tb_port *nhi,
struct tb_tunnel *tunnel;
size_t npaths = 0, i = 0;
struct tb_path *path;
- u32 credits;
+ int credits;
if (receive_ring > 0)
npaths++;
@@ -852,32 +1079,39 @@ struct tb_tunnel *tb_tunnel_alloc_dma(struct tb *tb, struct tb_port *nhi,
tunnel->src_port = nhi;
tunnel->dst_port = dst;
+ tunnel->deinit = tb_dma_deinit;
- credits = tb_dma_credits(nhi);
+ credits = min_not_zero(TB_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) {
- tb_tunnel_free(tunnel);
- return NULL;
- }
- tb_dma_init_path(path, TB_PATH_SOURCE | TB_PATH_INTERNAL, credits);
+ 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) {
- tb_tunnel_free(tunnel);
- return NULL;
- }
- tb_dma_init_path(path, TB_PATH_ALL, credits);
+ 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;
}
/**
@@ -1071,8 +1305,28 @@ static void tb_usb3_reclaim_available_bandwidth(struct tb_tunnel *tunnel,
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;
@@ -1080,10 +1334,9 @@ static void tb_usb3_init_path(struct tb_path *path)
path->priority = 3;
path->weight = 3;
path->drop_packages = 0;
- path->hops[0].initial_credits = 7;
- if (path->path_length > 1)
- path->hops[1].initial_credits =
- tb_initial_credits(path->hops[1].in_port->sw);
+
+ tb_path_for_each_hop(path, hop)
+ tb_usb3_init_credits(hop);
}
/**
@@ -1283,6 +1536,9 @@ void tb_tunnel_free(struct tb_tunnel *tunnel)
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]);
diff --git a/drivers/thunderbolt/tunnel.h b/drivers/thunderbolt/tunnel.h
index a66994fb4e60..eea14e24f7e0 100644
--- a/drivers/thunderbolt/tunnel.h
+++ b/drivers/thunderbolt/tunnel.h
@@ -27,6 +27,7 @@ enum tb_tunnel_type {
* @paths: All paths required by the tunnel
* @npaths: Number of paths in @paths
* @init: Optional tunnel specific initialization
+ * @deinit: Optional tunnel specific de-initialization
* @activate: Optional tunnel specific activation/deactivation
* @consumed_bandwidth: Return how much bandwidth the tunnel consumes
* @release_unused_bandwidth: Release all unused bandwidth
@@ -47,6 +48,7 @@ struct tb_tunnel {
struct tb_path **paths;
size_t npaths;
int (*init)(struct tb_tunnel *tunnel);
+ void (*deinit)(struct tb_tunnel *tunnel);
int (*activate)(struct tb_tunnel *tunnel, bool activate);
int (*consumed_bandwidth)(struct tb_tunnel *tunnel, int *consumed_up,
int *consumed_down);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 23:03:57 +0000