Message-Id: <1385688949-7101-3-git-send-email-andreas.noever@gmail.com>
Date:	Fri, 29 Nov 2013 02:35:39 +0100
From:	Andreas Noever <andreas.noever@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Andreas Noever <andreas.noever@...il.com>
Subject: [PATCH 02/12] thunderbolt: Add configuration channel interface

Thunderbolt devices are configured by reading/writing into their
configuration space (similar to pci). This is done by sending packets
through the NHI (native host interface) onto the configuration channel.

This patch handles the low level packet based protocol and exposes
higher level operations like tb_cfg_read/tb_cfg_write.

Signed-off-by: Andreas Noever <andreas.noever@...il.com>
---
 drivers/thunderbolt/Makefile |   2 +-
 drivers/thunderbolt/tb_cfg.c | 649 +++++++++++++++++++++++++++++++++++++++++++
 drivers/thunderbolt/tb_cfg.h |  67 +++++
 3 files changed, 717 insertions(+), 1 deletion(-)
 create mode 100644 drivers/thunderbolt/tb_cfg.c
 create mode 100644 drivers/thunderbolt/tb_cfg.h

diff --git a/drivers/thunderbolt/Makefile b/drivers/thunderbolt/Makefile
index 32b0504..f486295 100644
--- a/drivers/thunderbolt/Makefile
+++ b/drivers/thunderbolt/Makefile
@@ -1,3 +1,3 @@
 obj-${CONFIG_THUNDERBOLT} := thunderbolt.o
-thunderbolt-objs := dsl3510.o
+thunderbolt-objs := dsl3510.o tb_cfg.o
 
diff --git a/drivers/thunderbolt/tb_cfg.c b/drivers/thunderbolt/tb_cfg.c
new file mode 100644
index 0000000..bb958d5
--- /dev/null
+++ b/drivers/thunderbolt/tb_cfg.c
@@ -0,0 +1,649 @@
+/*
+ * Thunderbolt configuration channel
+ *
+ * Copyright (c) 2013 Andreas Noever <andreas.noever@...il.com>
+ */
+
+#include <linux/crc32.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/dmapool.h>
+#include <linux/workqueue.h>
+
+#include "tb_cfg.h"
+#include "dsl3510.h"
+
+
+/* config packet definitions */
+
+enum tb_cfg_pkg_type {
+	TB_CFG_PKG_READ = 1,
+	TB_CFG_PKG_WRITE = 2,
+	TB_CFG_PKG_ERROR = 3,
+	TB_CFG_PKG_NOTIFY_ACK = 4,
+	TB_CFG_PKG_EVENT = 5,
+	TB_CFG_PKG_XDOMAIN_REQ = 6,
+	TB_CFG_PKG_XDOMAIN_RESP = 7,
+	TB_CFG_PKG_OVERRIDE = 8,
+	TB_CFG_PKG_RESET = 9,
+	TB_CFG_PKG_PREPARE_TO_SLEEP = 0xd,
+};
+
+enum tb_cfg_error {
+	TB_CFG_ERROR_PORT_NOT_CONNECTED = 0,
+	TB_CFG_ERROR_INVALID_CONFIG_SPACE = 2,
+	TB_CFG_ERROR_NO_SUCH_PORT = 4,
+	TB_CFG_ERROR_ACK_PLUG_EVENT = 7,
+	TB_CFG_ERROR_LOOP = 8,
+};
+
+struct tb_cfg_header {
+	u32 route_hi:18;
+	u32 unknown:14; /* highest order bit is set on replies */
+	u32 route_lo;
+} __packed;
+
+struct tb_cfg_address {
+	u32 offset:13; /* in dwords */
+	u32 length:6; /* in dwords */
+	u32 port:6;
+	enum tb_cfg_space space:2;
+	u32 zero:5;
+} __packed;
+
+struct cfg_reset_pkg {
+	struct tb_cfg_header header;
+} __packed;
+
+struct cfg_error_pkg {
+	struct tb_cfg_header header;
+	enum tb_cfg_error error:4;
+	u32 zero1:4;
+	u32 port:6;
+	u32 zero2:2; /* Both should be zero, still they are different fields. */
+	u32 zero3:16;
+} __packed;
+
+struct cfg_plug_pkg {
+	struct tb_cfg_header header;
+	u32 port:6;
+	u32 zero:25;
+	bool unplug:1;
+} __packed;
+
+struct cfg_read_pkg {
+	struct tb_cfg_header header;
+	struct tb_cfg_address addr;
+} __packed;
+
+struct cfg_write_pkg {
+	struct tb_cfg_header header;
+	struct tb_cfg_address addr;
+	u32 data[64]; /* tb_cfg_address.length has 6 bits */
+} __packed;
+
+/* helper methods */
+
+static u64 get_route(struct tb_cfg_header header)
+{
+	return (u64) header.route_hi << 32 | header.route_lo;
+}
+
+static struct tb_cfg_header make_header(u64 route)
+{
+	struct tb_cfg_header header = {
+		.route_hi = route >> 32,
+		.route_lo = route,
+	};
+	/* check for overflow */
+	WARN_ON(get_route(header) != route);
+	return header;
+}
+
+static int decode_error(struct ring_packet *response)
+{
+	struct cfg_error_pkg *pkg = response->buffer;
+	u32 raw;
+	WARN_ON(response->eof != TB_CFG_PKG_ERROR);
+	if (WARN_ON(response->size != sizeof(*pkg)))
+		return -EIO;
+	raw = *(u32 *) (response->buffer + 8);
+	WARN_ON(pkg->zero1);
+	WARN_ON(pkg->zero2);
+	WARN_ON(pkg->zero3);
+	WARN_ON(pkg->header.unknown != 1 << 13);
+	switch (pkg->error) {
+	case TB_CFG_ERROR_PORT_NOT_CONNECTED:
+		/* Port is not connected. This can happen during surprise
+		 * removal. Do not warn. */
+		return -ENODEV;
+	case TB_CFG_ERROR_INVALID_CONFIG_SPACE:
+		/*
+		 * Invalid cfg_space/offset/length combination in
+		 * cfg_read/cfg_write.
+		 */
+		WARN(1,
+		     "CFG_ERROR(raw: %#x route: %#llx port: %d): Invalid config space of offset\n",
+		     raw,
+		     get_route(pkg->header),
+		     pkg->port);
+		return -ENXIO;
+	case TB_CFG_ERROR_NO_SUCH_PORT:
+		/*
+		 * - The route contains a non-existent port.
+		 * - The route contains a non-PHY port (e.g. PCIe).
+		 * - The port in cfg_read/cfg_write does not exist.
+		 */
+		WARN(1,
+		     "CFG_ERROR(raw: %#x route: %#llx port: %d): Invalid port\n",
+		     raw,
+		     get_route(pkg->header),
+		     pkg->port);
+		return -ENXIO;
+	case TB_CFG_ERROR_LOOP:
+		WARN(1,
+		     "CFG_ERROR(raw: %#x route: %#llx port: %d): Route contains a loop\n",
+		     raw,
+		     get_route(pkg->header),
+		     pkg->port);
+		return -EIO;
+	default:
+		/* 5,6,7,9 and 11 are also valid error codes */
+		WARN(1,
+		     "CFG_ERROR(raw: %#x route: %#llx port: %d): Unknown error\n",
+		     raw,
+		     get_route(pkg->header),
+		     pkg->port);
+		return -EIO;
+	}
+}
+
+static int check_header(struct ring_packet *pkg, size_t expected_len,
+			u64 expected_route, enum tb_cfg_pkg_type expected_type)
+{
+	struct tb_cfg_header *header = pkg->buffer;
+	if (pkg->eof == TB_CFG_PKG_ERROR)
+		return decode_error(pkg);
+	if (WARN_ON(pkg->size != expected_len))
+		return -EIO;
+	if (WARN_ON(header->unknown != 1 << 13))
+		return -EIO;
+	if (WARN_ON(get_route(*header) != expected_route))
+		return -EIO;
+	if (WARN_ON(pkg->eof != expected_type))
+		return -EIO;
+	if (WARN_ON(pkg->sof != 0))
+		return -EIO;
+	return 0;
+}
+
+static bool check_config_address(const struct tb_cfg_address *addr,
+				 enum tb_cfg_space space, uint32_t offset,
+				 uint32_t length)
+{
+	if (WARN_ON(addr->zero))
+		return -EIO;
+	if (WARN_ON(addr->space != space))
+		return -EIO;
+	if (WARN_ON(addr->offset != offset))
+		return -EIO;
+	if (WARN_ON(addr->length != length))
+		return -EIO;
+	/*
+	 * We cannot check addr->port as it is set to the upstream port of the
+	 * sender.
+	 */
+	return 0;
+}
+
+static void cpu_to_be32_array(__be32 *dst, u32 *src, size_t len)
+{
+	int i;
+	for (i = 0; i < len; i++)
+		dst[i] = cpu_to_be32(src[i]);
+}
+
+static void be32_to_cpu_array(u32 *dst, __be32 *src, size_t len)
+{
+	int i;
+	for (i = 0; i < len; i++)
+		dst[i] = be32_to_cpu(src[i]);
+}
+
+static __be32 tb_crc(void *data, size_t len)
+{
+	return cpu_to_be32(~__crc32c_le(~0, data, len));
+}
+
+/* RX/TX handling */
+
+/**
+ * tb_ctl_handle_plug_event() - acknowledge a plug event and invoke cfg->callback
+ */
+static void tb_ctl_handle_plug_event(struct tb_cfg *cfg,
+				     struct ring_packet *resp)
+{
+	struct cfg_plug_pkg *pkg = resp->buffer;
+	u64 route = get_route(pkg->header);
+	if (check_header(resp, sizeof(*pkg), route, TB_CFG_PKG_EVENT))
+		return;
+	if (tb_cfg_error(cfg, route, pkg->port))
+		tb_cfg_warn(cfg,
+			    "could not reset plug event on %llx:%x\n",
+			    route,
+			    pkg->port);
+	WARN_ON(pkg->zero);
+	cfg->callback(cfg->callback_data, route, pkg->port, pkg->unplug);
+}
+
+static void tb_ctl_free_packet(struct tb_cfg *cfg, struct ring_packet *pkg)
+{
+	dma_pool_free(cfg->packet_pool, pkg->buffer, pkg->buffer_phy);
+	kfree(pkg);
+}
+
+/**
+ * tb_ctl_alloc_packets() - allocate multiple packets safely
+ *
+ * Return: Returns 0 on success or an error code on failure.
+ */
+static int tb_ctl_alloc_packets(struct tb_cfg *cfg,
+				struct ring_packet **packets, int num)
+{
+	int i;
+	for (i = 0; i < num; i++) {
+		packets[i] = kzalloc(sizeof(*packets[i]), GFP_KERNEL);
+		if (!packets[i])
+			goto err;
+		packets[i]->buffer = dma_pool_alloc(cfg->packet_pool,
+		GFP_KERNEL,
+						    &packets[i]->buffer_phy);
+		if (!packets[i]->buffer)
+			goto err;
+	}
+	return 0;
+err:
+	if (!packets[i])
+		i--;
+	while (--i > 0) {
+		if (packets[i]->buffer)
+			dma_pool_free(cfg->packet_pool,
+				      packets[i]->buffer,
+				      packets[i]->buffer_phy);
+
+		kfree(packets[i]);
+	}
+	return -ENOMEM;
+}
+
+/**
+ * tb_cfg_tx() - transmit a packet on the config channel
+ *
+ * len must be a multiple of four.
+ *
+ * Return: Returns 0 on success or an error code on failure.
+ */
+static int tb_cfg_tx(struct tb_cfg *cfg, void *data, size_t len,
+		     enum tb_cfg_pkg_type type)
+{
+	struct ring_packet *pkg;
+	if (len % 4 != 0) { /* required for le->be conversion */
+		tb_cfg_WARN(cfg, "TX: invalid size: %zu\n", len);
+		return -EINVAL;
+	}
+	if (len > TB_FRAME_SIZE - 4) { /* checksum is 4 bytes */
+		tb_cfg_WARN(cfg,
+			    "TX: packet too large: %zu/%d\n",
+			    len,
+			    TB_FRAME_SIZE - 4);
+		return -EINVAL;
+	}
+	if (tb_ctl_alloc_packets(cfg, &pkg, 1))
+		return -ENOMEM;
+	cpu_to_be32_array(pkg->buffer, data, len / 4);
+	*(u32 *) (pkg->buffer + len) = tb_crc(pkg->buffer, len);
+	pkg->size = len + 4;
+	pkg->sof = type;
+	pkg->eof = type;
+	ring_tx(cfg->tx, pkg);
+	return 0;
+}
+
+static void tb_cfg_tx_callback(struct tb_ring *ring, void *priv)
+{
+	struct tb_cfg *cfg = priv;
+	struct ring_packet *pkg;
+	while ((pkg = ring_poll(ring)))
+		tb_ctl_free_packet(cfg, pkg);
+}
+
+/**
+ * tb_cfg_rx() - receive a packet from the config channel
+ *
+ * Will timeout after a few seconds. The caller should requeue the packet as
+ * soon as possible.
+ *
+ * Return: Returns a a received ring_packet or NULL.
+ */
+static struct ring_packet *tb_cfg_rx(struct tb_cfg *cfg)
+{
+	struct ring_packet *pkg;
+	/**
+	 * Most operations finish within a few milliseconds. But pci up/down
+	 * ports will block during activation/deactivation. In the future we might
+	 * have to implement variable timeouts or find a way to handle received
+	 * packets out of order. Until then we just use a high timeout.
+	 */
+	if (!wait_for_completion_timeout(&cfg->response_ready,
+					 msecs_to_jiffies(30000))) {
+		tb_cfg_WARN(cfg, "RX: timeout\n");
+		return NULL;
+	}
+
+	if (!kfifo_get(&cfg->response_fifo, &pkg)) {
+		tb_cfg_err(cfg,
+			   "RX: completion was signaled, but fifo was empty\n");
+		return NULL;
+	}
+	return pkg;
+}
+
+static void tb_cfg_rx_callback(struct tb_ring *ring, void *priv)
+{
+	struct tb_cfg *cfg = priv;
+	struct ring_packet *pkg;
+	while ((pkg = ring_poll(ring))) {
+		if (pkg->canceled) {
+			tb_ctl_free_packet(cfg, pkg);
+			continue;
+		}
+		if (pkg->size < 4 || pkg->size % 4 != 0) {
+			tb_cfg_err(cfg,
+				   "RX: invalid size %d, dropping packet\n",
+				   pkg->size);
+			goto rx;
+		}
+
+		pkg->size -= 4; /* remove checksum */
+		if (*(u32 *) (pkg->buffer + pkg->size)
+		    != tb_crc(pkg->buffer, pkg->size)) {
+			tb_cfg_err(cfg,
+				   "RX: checksum mismatch, dropping packet\n");
+			goto rx;
+		}
+		be32_to_cpu_array(pkg->buffer, pkg->buffer, pkg->size / 4);
+
+		if (pkg->eof == TB_CFG_PKG_EVENT) {
+			tb_ctl_handle_plug_event(cfg, pkg);
+			goto rx;
+		}
+		if (!kfifo_put(&cfg->response_fifo, pkg)) {
+			tb_cfg_err(cfg, "RX: fifo is full\n");
+			goto rx;
+		}
+		complete(&cfg->response_ready);
+		continue;
+rx:
+		ring_rx(cfg->rx, pkg);
+	}
+}
+
+
+/* public interface */
+
+/**
+ * tb_cfg_alloc() - allocate a config channel
+ *
+ * cb will be invoked once for every hot plug event.
+ *
+ * Return: Returns a pointer on success or NULL on failure.
+ */
+struct tb_cfg *tb_cfg_alloc(struct tb_nhi *nhi, hotplug_cb cb, void *cb_data)
+{
+	int i;
+	struct tb_cfg *cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
+	struct ring_packet *rx_packets[10] = { };
+	if (!cfg)
+		return NULL;
+	cfg->nhi = nhi;
+	cfg->callback = cb;
+	cfg->callback_data = cb_data;
+
+	init_completion(&cfg->response_ready);
+	INIT_KFIFO(cfg->response_fifo);
+	cfg->packet_pool = dma_pool_create("dls3510 cfg", &nhi->pdev->dev,
+					   TB_FRAME_SIZE, 4, 0);
+	if (!cfg->packet_pool)
+		goto err;
+
+	/* tb_ctl_handle_plug_event uses cfg->tx. Allocate cfg->tx first. */
+	cfg->tx = ring_alloc_tx(nhi, 0, 10, tb_cfg_tx_callback, cfg);
+	if (!cfg->tx)
+		goto err;
+
+	cfg->rx = ring_alloc_rx(nhi, 0, 10, tb_cfg_rx_callback, cfg);
+	if (!cfg->rx)
+		goto err;
+
+	/*
+	 * After the first call to ring_rx we will start to receive plug
+	 * notifications and call cfg->callback. After this we can no longer
+	 * bail out cleanly. To avoid this situation we allocate all packets
+	 * BEFORE calling ring_rx.
+	 */
+	if (tb_ctl_alloc_packets(cfg, rx_packets, 10))
+		goto err;
+	for (i = 0; i < 10; i++)
+		ring_rx(cfg->rx, rx_packets[i]);
+
+	tb_cfg_info(cfg, "config channel created\n");
+	return cfg;
+err:
+	tb_cfg_free(cfg);
+	return NULL;
+}
+
+/**
+ * tb_cfg_free() - shutdown and free a config channel
+ *
+ * All calls to cfg->callback will have finished on return.
+ *
+ * Must NOT be called from cfg->callback.
+ */
+void tb_cfg_free(struct tb_cfg *cfg)
+{
+	struct ring_packet *pkg;
+	/*
+	 * cfg->tx is used in tb_ctl_handle_plug_event. Free cfg->tx
+	 * after cfg->rx.
+	 */
+	if (cfg->rx)
+		ring_drain_and_free(cfg->rx);
+	if (cfg->tx)
+		ring_drain_and_free(cfg->tx);
+	while (kfifo_get(&cfg->response_fifo, &pkg))
+		tb_ctl_free_packet(cfg, pkg);
+	if (cfg->packet_pool)
+		dma_pool_destroy(cfg->packet_pool);
+	kfree(cfg);
+}
+
+/**
+ * tb_cfg_error() - send error packet
+ *
+ * Currently the error code is hardcoded to TB_CFG_ERROR_ACK_PLUG_EVENT.
+ *
+ * Return: Returns 0 on success or an error code on failure.
+ */
+int tb_cfg_error(struct tb_cfg *cfg, u64 route, u32 port)
+{
+	struct cfg_error_pkg pkg = {
+		.header = make_header(route),
+		.port = port,
+		.error = TB_CFG_ERROR_ACK_PLUG_EVENT,
+	};
+	tb_cfg_info(cfg, "resetting error on %llx:%x.\n", route, port);
+	return tb_cfg_tx(cfg, &pkg, sizeof(pkg), TB_CFG_PKG_ERROR);
+}
+
+/**
+ * tb_cfg_reset() - send an reset packet
+ *
+ * Return: Returns 0 on success or an error code on failure.
+ */
+int tb_cfg_reset(struct tb_cfg *cfg, u64 route)
+{
+	struct cfg_reset_pkg pkg = { .header = make_header(route) };
+	struct ring_packet *response;
+	int res = tb_cfg_tx(cfg, &pkg, sizeof(pkg), TB_CFG_PKG_RESET);
+	if (res)
+		return res;
+
+	response = tb_cfg_rx(cfg);
+	if (!response)
+		return -EIO;
+
+	res = check_header(response, 8, route, TB_CFG_PKG_RESET);
+	ring_rx(cfg->rx, response);
+	return res;
+}
+
+/**
+ * tb_cfg_read() - read from config space into buffer
+ *
+ * offset and length are in dwords.
+ *
+ * Return: Returns 0 on success or an error code on failure.
+ */
+int tb_cfg_read(struct tb_cfg *cfg, void *buffer, uint64_t route, uint32_t port,
+		enum tb_cfg_space space, uint32_t offset, uint32_t length)
+{
+	struct cfg_read_pkg pkg = {
+		.header = make_header(route),
+		.addr = {
+			.port = port,
+			.space = space,
+			.offset = offset,
+			.length = length,
+		},
+	};
+	struct ring_packet *response;
+	struct cfg_write_pkg *reply;
+	int res;
+
+	res = tb_cfg_tx(cfg, &pkg, sizeof(pkg), TB_CFG_PKG_READ);
+	if (res)
+		return res;
+
+	response = tb_cfg_rx(cfg);
+	if (!response)
+		return -EIO;
+
+	res = check_header(response, 12 + 4 * length, route, TB_CFG_PKG_READ);
+	if (res)
+		goto out;
+
+	reply = response->buffer;
+	res = check_config_address(&reply->addr, space, offset, length);
+	if (res)
+		goto out;
+
+	memcpy(buffer, &reply->data, 4 * length);
+out:
+	ring_rx(cfg->rx, response);
+	return res;
+}
+
+/**
+ * tb_cfg_write() - write from buffer into config space
+ *
+ * offset and length are in dwords.
+ *
+ * Return: Returns 0 on success or an error code on failure.
+ */
+int tb_cfg_write(struct tb_cfg *cfg, void *buffer, uint64_t route,
+		 uint32_t port, enum tb_cfg_space space, uint32_t offset,
+		 uint32_t length)
+{
+	struct cfg_write_pkg pkg = {
+		.header = make_header(route),
+		.addr = {
+			.port = port,
+			.space = space,
+			.offset = offset,
+			.length = length,
+		},
+	};
+	struct ring_packet *response;
+	struct cfg_read_pkg *reply;
+	int res;
+
+	memcpy(&pkg.data, buffer, length * 4);
+
+	res = tb_cfg_tx(cfg, &pkg, 12 + 4 * length, TB_CFG_PKG_WRITE);
+	if (res)
+		return res;
+
+	response = tb_cfg_rx(cfg);
+	if (!response)
+		return -EIO;
+
+	res = check_header(response, sizeof(*reply), route, TB_CFG_PKG_WRITE);
+	if (res)
+		goto out;
+
+	reply = response->buffer;
+	res = check_config_address(&reply->addr, space, offset, length);
+out:
+	ring_rx(cfg->rx, response);
+	return res;
+}
+
+/**
+ * tb_cfg_get_upstream_port() - get upstream port number of switch at route
+ *
+ * Reads the first dword from the switches TB_CFG_SWITCH config area and
+ * returns the port number from which the reply originated.
+ *
+ * This information is in principle present in every read/write response. We
+ * expose it only here in order to keep the normal API streamlined.
+ *
+ * Return: Returns the upstream port number on success or an error code on
+ * failure.
+ */
+int tb_cfg_get_upstream_port(struct tb_cfg *cfg, u64 route)
+{
+	struct cfg_read_pkg pkg = {
+		.header = make_header(route),
+		.addr = {
+			.port = 0,
+			.space = TB_CFG_SWITCH,
+			.offset = 0,
+			.length = 1,
+		},
+	};
+	struct ring_packet *response;
+	struct cfg_write_pkg *reply;
+	int res;
+
+	res = tb_cfg_tx(cfg, &pkg, sizeof(pkg), TB_CFG_PKG_READ);
+	if (res)
+		return res;
+
+	response = tb_cfg_rx(cfg);
+	if (!response)
+		return -EIO;
+
+	res = check_header(response, 12 + 4, route, TB_CFG_PKG_READ);
+	if (res)
+		goto out;
+
+	reply = response->buffer;
+	res = check_config_address(&reply->addr, TB_CFG_SWITCH, 0, 1);
+	if (res)
+		goto out;
+	res = reply->addr.port;
+out:
+	ring_rx(cfg->rx, response);
+	return res;
+}
diff --git a/drivers/thunderbolt/tb_cfg.h b/drivers/thunderbolt/tb_cfg.h
new file mode 100644
index 0000000..fa3a950
--- /dev/null
+++ b/drivers/thunderbolt/tb_cfg.h
@@ -0,0 +1,67 @@
+/*
+ * Thunderbolt configuration channel
+ *
+ * Copyright (c) 2013 Andreas Noever <andreas.noever@...il.com>
+ */
+
+#ifndef _TB_CFG
+#define _TB_CFG
+
+#include <linux/types.h>
+#include <linux/kfifo.h>
+#include <linux/dmapool.h>
+
+#include "dsl3510.h"
+
+typedef void (*hotplug_cb)(void *data, u64 route, u8 port, bool unplug);
+
+/**
+ * struct tb_cfg - thunderbolt configuration channel
+ */
+struct tb_cfg {
+	struct tb_nhi *nhi;
+	struct tb_ring *tx;
+	struct tb_ring *rx;
+
+	struct dma_pool *packet_pool;
+
+	DECLARE_KFIFO(response_fifo, struct ring_packet*, 16);
+
+	struct completion response_ready;
+
+	hotplug_cb callback;
+	void *callback_data;
+};
+
+#define tb_cfg_WARN(cfg, format, arg...) \
+	dev_WARN(&(cfg)->nhi->pdev->dev, format, ## arg)
+
+#define tb_cfg_err(cfg, format, arg...) \
+	dev_err(&(cfg)->nhi->pdev->dev, format, ## arg)
+
+#define tb_cfg_warn(cfg, format, arg...) \
+	dev_warn(&(cfg)->nhi->pdev->dev, format, ## arg)
+
+#define tb_cfg_info(cfg, format, arg...) \
+	dev_info(&(cfg)->nhi->pdev->dev, format, ## arg)
+
+struct tb_cfg *tb_cfg_alloc(struct tb_nhi *nhi, hotplug_cb cb, void *cb_data);
+void tb_cfg_free(struct tb_cfg *cfg);
+
+enum tb_cfg_space {
+	TB_CFG_HOPS = 0,
+	TB_CFG_PORT = 1,
+	TB_CFG_SWITCH = 2,
+	TB_CFG_COUNTERS = 3,
+};
+
+int tb_cfg_error(struct tb_cfg *cfg, u64 route, u32 port);
+int tb_cfg_reset(struct tb_cfg *cfg, u64 route);
+int tb_cfg_read(struct tb_cfg *cfg, void *buffer, uint64_t route, uint32_t port,
+		enum tb_cfg_space space, uint32_t offset, uint32_t length);
+int tb_cfg_write(struct tb_cfg *cfg, void *buffer, uint64_t route,
+		 uint32_t port, enum tb_cfg_space space, uint32_t offset,
+		 uint32_t length);
+int tb_cfg_get_upstream_port(struct tb_cfg *cfg, u64 route);
+
+#endif
-- 
1.8.4.2

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