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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/thunderbolt/debugfs.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/thunderbolt/debugfs.c')
-rw-r--r--drivers/thunderbolt/debugfs.c1600
1 files changed, 1600 insertions, 0 deletions
diff --git a/drivers/thunderbolt/debugfs.c b/drivers/thunderbolt/debugfs.c
new file mode 100644
index 0000000000..e324cd8997
--- /dev/null
+++ b/drivers/thunderbolt/debugfs.c
@@ -0,0 +1,1600 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Debugfs interface
+ *
+ * Copyright (C) 2020, Intel Corporation
+ * Authors: Gil Fine <gil.fine@intel.com>
+ * Mika Westerberg <mika.westerberg@linux.intel.com>
+ */
+
+#include <linux/debugfs.h>
+#include <linux/pm_runtime.h>
+#include <linux/uaccess.h>
+
+#include "tb.h"
+#include "sb_regs.h"
+
+#define PORT_CAP_V1_PCIE_LEN 1
+#define PORT_CAP_V2_PCIE_LEN 2
+#define PORT_CAP_POWER_LEN 2
+#define PORT_CAP_LANE_LEN 3
+#define PORT_CAP_USB3_LEN 5
+#define PORT_CAP_DP_V1_LEN 9
+#define PORT_CAP_DP_V2_LEN 14
+#define PORT_CAP_TMU_V1_LEN 8
+#define PORT_CAP_TMU_V2_LEN 10
+#define PORT_CAP_BASIC_LEN 9
+#define PORT_CAP_USB4_LEN 20
+
+#define SWITCH_CAP_TMU_LEN 26
+#define SWITCH_CAP_BASIC_LEN 27
+
+#define PATH_LEN 2
+
+#define COUNTER_SET_LEN 3
+
+#define DEBUGFS_ATTR(__space, __write) \
+static int __space ## _open(struct inode *inode, struct file *file) \
+{ \
+ return single_open(file, __space ## _show, inode->i_private); \
+} \
+ \
+static const struct file_operations __space ## _fops = { \
+ .owner = THIS_MODULE, \
+ .open = __space ## _open, \
+ .release = single_release, \
+ .read = seq_read, \
+ .write = __write, \
+ .llseek = seq_lseek, \
+}
+
+#define DEBUGFS_ATTR_RO(__space) \
+ DEBUGFS_ATTR(__space, NULL)
+
+#define DEBUGFS_ATTR_RW(__space) \
+ DEBUGFS_ATTR(__space, __space ## _write)
+
+static struct dentry *tb_debugfs_root;
+
+static void *validate_and_copy_from_user(const void __user *user_buf,
+ size_t *count)
+{
+ size_t nbytes;
+ void *buf;
+
+ if (!*count)
+ return ERR_PTR(-EINVAL);
+
+ if (!access_ok(user_buf, *count))
+ return ERR_PTR(-EFAULT);
+
+ buf = (void *)get_zeroed_page(GFP_KERNEL);
+ if (!buf)
+ return ERR_PTR(-ENOMEM);
+
+ nbytes = min_t(size_t, *count, PAGE_SIZE);
+ if (copy_from_user(buf, user_buf, nbytes)) {
+ free_page((unsigned long)buf);
+ return ERR_PTR(-EFAULT);
+ }
+
+ *count = nbytes;
+ return buf;
+}
+
+static bool parse_line(char **line, u32 *offs, u32 *val, int short_fmt_len,
+ int long_fmt_len)
+{
+ char *token;
+ u32 v[5];
+ int ret;
+
+ token = strsep(line, "\n");
+ if (!token)
+ return false;
+
+ /*
+ * For Adapter/Router configuration space:
+ * Short format is: offset value\n
+ * v[0] v[1]
+ * Long format as produced from the read side:
+ * offset relative_offset cap_id vs_cap_id value\n
+ * v[0] v[1] v[2] v[3] v[4]
+ *
+ * For Counter configuration space:
+ * Short format is: offset\n
+ * v[0]
+ * Long format as produced from the read side:
+ * offset relative_offset counter_id value\n
+ * v[0] v[1] v[2] v[3]
+ */
+ ret = sscanf(token, "%i %i %i %i %i", &v[0], &v[1], &v[2], &v[3], &v[4]);
+ /* In case of Counters, clear counter, "val" content is NA */
+ if (ret == short_fmt_len) {
+ *offs = v[0];
+ *val = v[short_fmt_len - 1];
+ return true;
+ } else if (ret == long_fmt_len) {
+ *offs = v[0];
+ *val = v[long_fmt_len - 1];
+ return true;
+ }
+
+ return false;
+}
+
+#if IS_ENABLED(CONFIG_USB4_DEBUGFS_WRITE)
+static ssize_t regs_write(struct tb_switch *sw, struct tb_port *port,
+ const char __user *user_buf, size_t count,
+ loff_t *ppos)
+{
+ struct tb *tb = sw->tb;
+ char *line, *buf;
+ u32 val, offset;
+ int ret = 0;
+
+ buf = validate_and_copy_from_user(user_buf, &count);
+ if (IS_ERR(buf))
+ return PTR_ERR(buf);
+
+ pm_runtime_get_sync(&sw->dev);
+
+ if (mutex_lock_interruptible(&tb->lock)) {
+ ret = -ERESTARTSYS;
+ goto out;
+ }
+
+ /* User did hardware changes behind the driver's back */
+ add_taint(TAINT_USER, LOCKDEP_STILL_OK);
+
+ line = buf;
+ while (parse_line(&line, &offset, &val, 2, 5)) {
+ if (port)
+ ret = tb_port_write(port, &val, TB_CFG_PORT, offset, 1);
+ else
+ ret = tb_sw_write(sw, &val, TB_CFG_SWITCH, offset, 1);
+ if (ret)
+ break;
+ }
+
+ mutex_unlock(&tb->lock);
+
+out:
+ pm_runtime_mark_last_busy(&sw->dev);
+ pm_runtime_put_autosuspend(&sw->dev);
+ free_page((unsigned long)buf);
+
+ return ret < 0 ? ret : count;
+}
+
+static ssize_t port_regs_write(struct file *file, const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct seq_file *s = file->private_data;
+ struct tb_port *port = s->private;
+
+ return regs_write(port->sw, port, user_buf, count, ppos);
+}
+
+static ssize_t switch_regs_write(struct file *file, const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct seq_file *s = file->private_data;
+ struct tb_switch *sw = s->private;
+
+ return regs_write(sw, NULL, user_buf, count, ppos);
+}
+#define DEBUGFS_MODE 0600
+#else
+#define port_regs_write NULL
+#define switch_regs_write NULL
+#define DEBUGFS_MODE 0400
+#endif
+
+#if IS_ENABLED(CONFIG_USB4_DEBUGFS_MARGINING)
+/**
+ * struct tb_margining - Lane margining support
+ * @caps: Port lane margining capabilities
+ * @results: Last lane margining results
+ * @lanes: %0, %1 or %7 (all)
+ * @min_ber_level: Minimum supported BER level contour value
+ * @max_ber_level: Maximum supported BER level contour value
+ * @ber_level: Current BER level contour value
+ * @voltage_steps: Number of mandatory voltage steps
+ * @max_voltage_offset: Maximum mandatory voltage offset (in mV)
+ * @time_steps: Number of time margin steps
+ * @max_time_offset: Maximum time margin offset (in mUI)
+ * @software: %true if software margining is used instead of hardware
+ * @time: %true if time margining is used instead of voltage
+ * @right_high: %false if left/low margin test is performed, %true if
+ * right/high
+ */
+struct tb_margining {
+ u32 caps[2];
+ u32 results[2];
+ unsigned int lanes;
+ unsigned int min_ber_level;
+ unsigned int max_ber_level;
+ unsigned int ber_level;
+ unsigned int voltage_steps;
+ unsigned int max_voltage_offset;
+ unsigned int time_steps;
+ unsigned int max_time_offset;
+ bool software;
+ bool time;
+ bool right_high;
+};
+
+static bool supports_software(const struct usb4_port *usb4)
+{
+ return usb4->margining->caps[0] & USB4_MARGIN_CAP_0_MODES_SW;
+}
+
+static bool supports_hardware(const struct usb4_port *usb4)
+{
+ return usb4->margining->caps[0] & USB4_MARGIN_CAP_0_MODES_HW;
+}
+
+static bool both_lanes(const struct usb4_port *usb4)
+{
+ return usb4->margining->caps[0] & USB4_MARGIN_CAP_0_2_LANES;
+}
+
+static unsigned int independent_voltage_margins(const struct usb4_port *usb4)
+{
+ return (usb4->margining->caps[0] & USB4_MARGIN_CAP_0_VOLTAGE_INDP_MASK) >>
+ USB4_MARGIN_CAP_0_VOLTAGE_INDP_SHIFT;
+}
+
+static bool supports_time(const struct usb4_port *usb4)
+{
+ return usb4->margining->caps[0] & USB4_MARGIN_CAP_0_TIME;
+}
+
+/* Only applicable if supports_time() returns true */
+static unsigned int independent_time_margins(const struct usb4_port *usb4)
+{
+ return (usb4->margining->caps[1] & USB4_MARGIN_CAP_1_TIME_INDP_MASK) >>
+ USB4_MARGIN_CAP_1_TIME_INDP_SHIFT;
+}
+
+static ssize_t
+margining_ber_level_write(struct file *file, const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct seq_file *s = file->private_data;
+ struct tb_port *port = s->private;
+ struct usb4_port *usb4 = port->usb4;
+ struct tb *tb = port->sw->tb;
+ unsigned int val;
+ int ret = 0;
+ char *buf;
+
+ if (mutex_lock_interruptible(&tb->lock))
+ return -ERESTARTSYS;
+
+ if (usb4->margining->software) {
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+
+ buf = validate_and_copy_from_user(user_buf, &count);
+ if (IS_ERR(buf)) {
+ ret = PTR_ERR(buf);
+ goto out_unlock;
+ }
+
+ buf[count - 1] = '\0';
+
+ ret = kstrtouint(buf, 10, &val);
+ if (ret)
+ goto out_free;
+
+ if (val < usb4->margining->min_ber_level ||
+ val > usb4->margining->max_ber_level) {
+ ret = -EINVAL;
+ goto out_free;
+ }
+
+ usb4->margining->ber_level = val;
+
+out_free:
+ free_page((unsigned long)buf);
+out_unlock:
+ mutex_unlock(&tb->lock);
+
+ return ret < 0 ? ret : count;
+}
+
+static void ber_level_show(struct seq_file *s, unsigned int val)
+{
+ if (val % 2)
+ seq_printf(s, "3 * 1e%d (%u)\n", -12 + (val + 1) / 2, val);
+ else
+ seq_printf(s, "1e%d (%u)\n", -12 + val / 2, val);
+}
+
+static int margining_ber_level_show(struct seq_file *s, void *not_used)
+{
+ struct tb_port *port = s->private;
+ struct usb4_port *usb4 = port->usb4;
+
+ if (usb4->margining->software)
+ return -EINVAL;
+ ber_level_show(s, usb4->margining->ber_level);
+ return 0;
+}
+DEBUGFS_ATTR_RW(margining_ber_level);
+
+static int margining_caps_show(struct seq_file *s, void *not_used)
+{
+ struct tb_port *port = s->private;
+ struct usb4_port *usb4 = port->usb4;
+ struct tb *tb = port->sw->tb;
+ u32 cap0, cap1;
+
+ if (mutex_lock_interruptible(&tb->lock))
+ return -ERESTARTSYS;
+
+ /* Dump the raw caps first */
+ cap0 = usb4->margining->caps[0];
+ seq_printf(s, "0x%08x\n", cap0);
+ cap1 = usb4->margining->caps[1];
+ seq_printf(s, "0x%08x\n", cap1);
+
+ seq_printf(s, "# software margining: %s\n",
+ supports_software(usb4) ? "yes" : "no");
+ if (supports_hardware(usb4)) {
+ seq_puts(s, "# hardware margining: yes\n");
+ seq_puts(s, "# minimum BER level contour: ");
+ ber_level_show(s, usb4->margining->min_ber_level);
+ seq_puts(s, "# maximum BER level contour: ");
+ ber_level_show(s, usb4->margining->max_ber_level);
+ } else {
+ seq_puts(s, "# hardware margining: no\n");
+ }
+
+ seq_printf(s, "# both lanes simultaneously: %s\n",
+ both_lanes(usb4) ? "yes" : "no");
+ seq_printf(s, "# voltage margin steps: %u\n",
+ usb4->margining->voltage_steps);
+ seq_printf(s, "# maximum voltage offset: %u mV\n",
+ usb4->margining->max_voltage_offset);
+
+ switch (independent_voltage_margins(usb4)) {
+ case USB4_MARGIN_CAP_0_VOLTAGE_MIN:
+ seq_puts(s, "# returns minimum between high and low voltage margins\n");
+ break;
+ case USB4_MARGIN_CAP_0_VOLTAGE_HL:
+ seq_puts(s, "# returns high or low voltage margin\n");
+ break;
+ case USB4_MARGIN_CAP_0_VOLTAGE_BOTH:
+ seq_puts(s, "# returns both high and low margins\n");
+ break;
+ }
+
+ if (supports_time(usb4)) {
+ seq_puts(s, "# time margining: yes\n");
+ seq_printf(s, "# time margining is destructive: %s\n",
+ cap1 & USB4_MARGIN_CAP_1_TIME_DESTR ? "yes" : "no");
+
+ switch (independent_time_margins(usb4)) {
+ case USB4_MARGIN_CAP_1_TIME_MIN:
+ seq_puts(s, "# returns minimum between left and right time margins\n");
+ break;
+ case USB4_MARGIN_CAP_1_TIME_LR:
+ seq_puts(s, "# returns left or right margin\n");
+ break;
+ case USB4_MARGIN_CAP_1_TIME_BOTH:
+ seq_puts(s, "# returns both left and right margins\n");
+ break;
+ }
+
+ seq_printf(s, "# time margin steps: %u\n",
+ usb4->margining->time_steps);
+ seq_printf(s, "# maximum time offset: %u mUI\n",
+ usb4->margining->max_time_offset);
+ } else {
+ seq_puts(s, "# time margining: no\n");
+ }
+
+ mutex_unlock(&tb->lock);
+ return 0;
+}
+DEBUGFS_ATTR_RO(margining_caps);
+
+static ssize_t
+margining_lanes_write(struct file *file, const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct seq_file *s = file->private_data;
+ struct tb_port *port = s->private;
+ struct usb4_port *usb4 = port->usb4;
+ struct tb *tb = port->sw->tb;
+ int ret = 0;
+ char *buf;
+
+ buf = validate_and_copy_from_user(user_buf, &count);
+ if (IS_ERR(buf))
+ return PTR_ERR(buf);
+
+ buf[count - 1] = '\0';
+
+ if (mutex_lock_interruptible(&tb->lock)) {
+ ret = -ERESTARTSYS;
+ goto out_free;
+ }
+
+ if (!strcmp(buf, "0")) {
+ usb4->margining->lanes = 0;
+ } else if (!strcmp(buf, "1")) {
+ usb4->margining->lanes = 1;
+ } else if (!strcmp(buf, "all")) {
+ /* Needs to be supported */
+ if (both_lanes(usb4))
+ usb4->margining->lanes = 7;
+ else
+ ret = -EINVAL;
+ } else {
+ ret = -EINVAL;
+ }
+
+ mutex_unlock(&tb->lock);
+
+out_free:
+ free_page((unsigned long)buf);
+ return ret < 0 ? ret : count;
+}
+
+static int margining_lanes_show(struct seq_file *s, void *not_used)
+{
+ struct tb_port *port = s->private;
+ struct usb4_port *usb4 = port->usb4;
+ struct tb *tb = port->sw->tb;
+ unsigned int lanes;
+
+ if (mutex_lock_interruptible(&tb->lock))
+ return -ERESTARTSYS;
+
+ lanes = usb4->margining->lanes;
+ if (both_lanes(usb4)) {
+ if (!lanes)
+ seq_puts(s, "[0] 1 all\n");
+ else if (lanes == 1)
+ seq_puts(s, "0 [1] all\n");
+ else
+ seq_puts(s, "0 1 [all]\n");
+ } else {
+ if (!lanes)
+ seq_puts(s, "[0] 1\n");
+ else
+ seq_puts(s, "0 [1]\n");
+ }
+
+ mutex_unlock(&tb->lock);
+ return 0;
+}
+DEBUGFS_ATTR_RW(margining_lanes);
+
+static ssize_t margining_mode_write(struct file *file,
+ const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct seq_file *s = file->private_data;
+ struct tb_port *port = s->private;
+ struct usb4_port *usb4 = port->usb4;
+ struct tb *tb = port->sw->tb;
+ int ret = 0;
+ char *buf;
+
+ buf = validate_and_copy_from_user(user_buf, &count);
+ if (IS_ERR(buf))
+ return PTR_ERR(buf);
+
+ buf[count - 1] = '\0';
+
+ if (mutex_lock_interruptible(&tb->lock)) {
+ ret = -ERESTARTSYS;
+ goto out_free;
+ }
+
+ if (!strcmp(buf, "software")) {
+ if (supports_software(usb4))
+ usb4->margining->software = true;
+ else
+ ret = -EINVAL;
+ } else if (!strcmp(buf, "hardware")) {
+ if (supports_hardware(usb4))
+ usb4->margining->software = false;
+ else
+ ret = -EINVAL;
+ } else {
+ ret = -EINVAL;
+ }
+
+ mutex_unlock(&tb->lock);
+
+out_free:
+ free_page((unsigned long)buf);
+ return ret ? ret : count;
+}
+
+static int margining_mode_show(struct seq_file *s, void *not_used)
+{
+ const struct tb_port *port = s->private;
+ const struct usb4_port *usb4 = port->usb4;
+ struct tb *tb = port->sw->tb;
+ const char *space = "";
+
+ if (mutex_lock_interruptible(&tb->lock))
+ return -ERESTARTSYS;
+
+ if (supports_software(usb4)) {
+ if (usb4->margining->software)
+ seq_puts(s, "[software]");
+ else
+ seq_puts(s, "software");
+ space = " ";
+ }
+ if (supports_hardware(usb4)) {
+ if (usb4->margining->software)
+ seq_printf(s, "%shardware", space);
+ else
+ seq_printf(s, "%s[hardware]", space);
+ }
+
+ mutex_unlock(&tb->lock);
+
+ seq_puts(s, "\n");
+ return 0;
+}
+DEBUGFS_ATTR_RW(margining_mode);
+
+static int margining_run_write(void *data, u64 val)
+{
+ struct tb_port *port = data;
+ struct usb4_port *usb4 = port->usb4;
+ struct tb_switch *sw = port->sw;
+ struct tb_margining *margining;
+ struct tb_switch *down_sw;
+ struct tb *tb = sw->tb;
+ int ret, clx;
+
+ if (val != 1)
+ return -EINVAL;
+
+ pm_runtime_get_sync(&sw->dev);
+
+ if (mutex_lock_interruptible(&tb->lock)) {
+ ret = -ERESTARTSYS;
+ goto out_rpm_put;
+ }
+
+ if (tb_is_upstream_port(port))
+ down_sw = sw;
+ else if (port->remote)
+ down_sw = port->remote->sw;
+ else
+ down_sw = NULL;
+
+ if (down_sw) {
+ /*
+ * CL states may interfere with lane margining so
+ * disable them temporarily now.
+ */
+ ret = tb_switch_clx_disable(down_sw);
+ if (ret < 0) {
+ tb_sw_warn(down_sw, "failed to disable CL states\n");
+ goto out_unlock;
+ }
+ clx = ret;
+ }
+
+ margining = usb4->margining;
+
+ if (margining->software) {
+ tb_port_dbg(port, "running software %s lane margining for lanes %u\n",
+ margining->time ? "time" : "voltage", margining->lanes);
+ ret = usb4_port_sw_margin(port, margining->lanes, margining->time,
+ margining->right_high,
+ USB4_MARGIN_SW_COUNTER_CLEAR);
+ if (ret)
+ goto out_clx;
+
+ ret = usb4_port_sw_margin_errors(port, &margining->results[0]);
+ } else {
+ tb_port_dbg(port, "running hardware %s lane margining for lanes %u\n",
+ margining->time ? "time" : "voltage", margining->lanes);
+ /* Clear the results */
+ margining->results[0] = 0;
+ margining->results[1] = 0;
+ ret = usb4_port_hw_margin(port, margining->lanes,
+ margining->ber_level, margining->time,
+ margining->right_high, margining->results);
+ }
+
+out_clx:
+ if (down_sw)
+ tb_switch_clx_enable(down_sw, clx);
+out_unlock:
+ mutex_unlock(&tb->lock);
+out_rpm_put:
+ pm_runtime_mark_last_busy(&sw->dev);
+ pm_runtime_put_autosuspend(&sw->dev);
+
+ return ret;
+}
+DEFINE_DEBUGFS_ATTRIBUTE(margining_run_fops, NULL, margining_run_write,
+ "%llu\n");
+
+static ssize_t margining_results_write(struct file *file,
+ const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct seq_file *s = file->private_data;
+ struct tb_port *port = s->private;
+ struct usb4_port *usb4 = port->usb4;
+ struct tb *tb = port->sw->tb;
+
+ if (mutex_lock_interruptible(&tb->lock))
+ return -ERESTARTSYS;
+
+ /* Just clear the results */
+ usb4->margining->results[0] = 0;
+ usb4->margining->results[1] = 0;
+
+ mutex_unlock(&tb->lock);
+ return count;
+}
+
+static void voltage_margin_show(struct seq_file *s,
+ const struct tb_margining *margining, u8 val)
+{
+ unsigned int tmp, voltage;
+
+ tmp = val & USB4_MARGIN_HW_RES_1_MARGIN_MASK;
+ voltage = tmp * margining->max_voltage_offset / margining->voltage_steps;
+ seq_printf(s, "%u mV (%u)", voltage, tmp);
+ if (val & USB4_MARGIN_HW_RES_1_EXCEEDS)
+ seq_puts(s, " exceeds maximum");
+ seq_puts(s, "\n");
+}
+
+static void time_margin_show(struct seq_file *s,
+ const struct tb_margining *margining, u8 val)
+{
+ unsigned int tmp, interval;
+
+ tmp = val & USB4_MARGIN_HW_RES_1_MARGIN_MASK;
+ interval = tmp * margining->max_time_offset / margining->time_steps;
+ seq_printf(s, "%u mUI (%u)", interval, tmp);
+ if (val & USB4_MARGIN_HW_RES_1_EXCEEDS)
+ seq_puts(s, " exceeds maximum");
+ seq_puts(s, "\n");
+}
+
+static int margining_results_show(struct seq_file *s, void *not_used)
+{
+ struct tb_port *port = s->private;
+ struct usb4_port *usb4 = port->usb4;
+ struct tb_margining *margining;
+ struct tb *tb = port->sw->tb;
+
+ if (mutex_lock_interruptible(&tb->lock))
+ return -ERESTARTSYS;
+
+ margining = usb4->margining;
+ /* Dump the raw results first */
+ seq_printf(s, "0x%08x\n", margining->results[0]);
+ /* Only the hardware margining has two result dwords */
+ if (!margining->software) {
+ unsigned int val;
+
+ seq_printf(s, "0x%08x\n", margining->results[1]);
+
+ if (margining->time) {
+ if (!margining->lanes || margining->lanes == 7) {
+ val = margining->results[1];
+ seq_puts(s, "# lane 0 right time margin: ");
+ time_margin_show(s, margining, val);
+ val = margining->results[1] >>
+ USB4_MARGIN_HW_RES_1_L0_LL_MARGIN_SHIFT;
+ seq_puts(s, "# lane 0 left time margin: ");
+ time_margin_show(s, margining, val);
+ }
+ if (margining->lanes == 1 || margining->lanes == 7) {
+ val = margining->results[1] >>
+ USB4_MARGIN_HW_RES_1_L1_RH_MARGIN_SHIFT;
+ seq_puts(s, "# lane 1 right time margin: ");
+ time_margin_show(s, margining, val);
+ val = margining->results[1] >>
+ USB4_MARGIN_HW_RES_1_L1_LL_MARGIN_SHIFT;
+ seq_puts(s, "# lane 1 left time margin: ");
+ time_margin_show(s, margining, val);
+ }
+ } else {
+ if (!margining->lanes || margining->lanes == 7) {
+ val = margining->results[1];
+ seq_puts(s, "# lane 0 high voltage margin: ");
+ voltage_margin_show(s, margining, val);
+ val = margining->results[1] >>
+ USB4_MARGIN_HW_RES_1_L0_LL_MARGIN_SHIFT;
+ seq_puts(s, "# lane 0 low voltage margin: ");
+ voltage_margin_show(s, margining, val);
+ }
+ if (margining->lanes == 1 || margining->lanes == 7) {
+ val = margining->results[1] >>
+ USB4_MARGIN_HW_RES_1_L1_RH_MARGIN_SHIFT;
+ seq_puts(s, "# lane 1 high voltage margin: ");
+ voltage_margin_show(s, margining, val);
+ val = margining->results[1] >>
+ USB4_MARGIN_HW_RES_1_L1_LL_MARGIN_SHIFT;
+ seq_puts(s, "# lane 1 low voltage margin: ");
+ voltage_margin_show(s, margining, val);
+ }
+ }
+ }
+
+ mutex_unlock(&tb->lock);
+ return 0;
+}
+DEBUGFS_ATTR_RW(margining_results);
+
+static ssize_t margining_test_write(struct file *file,
+ const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct seq_file *s = file->private_data;
+ struct tb_port *port = s->private;
+ struct usb4_port *usb4 = port->usb4;
+ struct tb *tb = port->sw->tb;
+ int ret = 0;
+ char *buf;
+
+ buf = validate_and_copy_from_user(user_buf, &count);
+ if (IS_ERR(buf))
+ return PTR_ERR(buf);
+
+ buf[count - 1] = '\0';
+
+ if (mutex_lock_interruptible(&tb->lock)) {
+ ret = -ERESTARTSYS;
+ goto out_free;
+ }
+
+ if (!strcmp(buf, "time") && supports_time(usb4))
+ usb4->margining->time = true;
+ else if (!strcmp(buf, "voltage"))
+ usb4->margining->time = false;
+ else
+ ret = -EINVAL;
+
+ mutex_unlock(&tb->lock);
+
+out_free:
+ free_page((unsigned long)buf);
+ return ret ? ret : count;
+}
+
+static int margining_test_show(struct seq_file *s, void *not_used)
+{
+ struct tb_port *port = s->private;
+ struct usb4_port *usb4 = port->usb4;
+ struct tb *tb = port->sw->tb;
+
+ if (mutex_lock_interruptible(&tb->lock))
+ return -ERESTARTSYS;
+
+ if (supports_time(usb4)) {
+ if (usb4->margining->time)
+ seq_puts(s, "voltage [time]\n");
+ else
+ seq_puts(s, "[voltage] time\n");
+ } else {
+ seq_puts(s, "[voltage]\n");
+ }
+
+ mutex_unlock(&tb->lock);
+ return 0;
+}
+DEBUGFS_ATTR_RW(margining_test);
+
+static ssize_t margining_margin_write(struct file *file,
+ const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct seq_file *s = file->private_data;
+ struct tb_port *port = s->private;
+ struct usb4_port *usb4 = port->usb4;
+ struct tb *tb = port->sw->tb;
+ int ret = 0;
+ char *buf;
+
+ buf = validate_and_copy_from_user(user_buf, &count);
+ if (IS_ERR(buf))
+ return PTR_ERR(buf);
+
+ buf[count - 1] = '\0';
+
+ if (mutex_lock_interruptible(&tb->lock)) {
+ ret = -ERESTARTSYS;
+ goto out_free;
+ }
+
+ if (usb4->margining->time) {
+ if (!strcmp(buf, "left"))
+ usb4->margining->right_high = false;
+ else if (!strcmp(buf, "right"))
+ usb4->margining->right_high = true;
+ else
+ ret = -EINVAL;
+ } else {
+ if (!strcmp(buf, "low"))
+ usb4->margining->right_high = false;
+ else if (!strcmp(buf, "high"))
+ usb4->margining->right_high = true;
+ else
+ ret = -EINVAL;
+ }
+
+ mutex_unlock(&tb->lock);
+
+out_free:
+ free_page((unsigned long)buf);
+ return ret ? ret : count;
+}
+
+static int margining_margin_show(struct seq_file *s, void *not_used)
+{
+ struct tb_port *port = s->private;
+ struct usb4_port *usb4 = port->usb4;
+ struct tb *tb = port->sw->tb;
+
+ if (mutex_lock_interruptible(&tb->lock))
+ return -ERESTARTSYS;
+
+ if (usb4->margining->time) {
+ if (usb4->margining->right_high)
+ seq_puts(s, "left [right]\n");
+ else
+ seq_puts(s, "[left] right\n");
+ } else {
+ if (usb4->margining->right_high)
+ seq_puts(s, "low [high]\n");
+ else
+ seq_puts(s, "[low] high\n");
+ }
+
+ mutex_unlock(&tb->lock);
+ return 0;
+}
+DEBUGFS_ATTR_RW(margining_margin);
+
+static void margining_port_init(struct tb_port *port)
+{
+ struct tb_margining *margining;
+ struct dentry *dir, *parent;
+ struct usb4_port *usb4;
+ char dir_name[10];
+ unsigned int val;
+ int ret;
+
+ usb4 = port->usb4;
+ if (!usb4)
+ return;
+
+ snprintf(dir_name, sizeof(dir_name), "port%d", port->port);
+ parent = debugfs_lookup(dir_name, port->sw->debugfs_dir);
+
+ margining = kzalloc(sizeof(*margining), GFP_KERNEL);
+ if (!margining)
+ return;
+
+ ret = usb4_port_margining_caps(port, margining->caps);
+ if (ret) {
+ kfree(margining);
+ return;
+ }
+
+ usb4->margining = margining;
+
+ /* Set the initial mode */
+ if (supports_software(usb4))
+ margining->software = true;
+
+ val = (margining->caps[0] & USB4_MARGIN_CAP_0_VOLTAGE_STEPS_MASK) >>
+ USB4_MARGIN_CAP_0_VOLTAGE_STEPS_SHIFT;
+ margining->voltage_steps = val;
+ val = (margining->caps[0] & USB4_MARGIN_CAP_0_MAX_VOLTAGE_OFFSET_MASK) >>
+ USB4_MARGIN_CAP_0_MAX_VOLTAGE_OFFSET_SHIFT;
+ margining->max_voltage_offset = 74 + val * 2;
+
+ if (supports_time(usb4)) {
+ val = (margining->caps[1] & USB4_MARGIN_CAP_1_TIME_STEPS_MASK) >>
+ USB4_MARGIN_CAP_1_TIME_STEPS_SHIFT;
+ margining->time_steps = val;
+ val = (margining->caps[1] & USB4_MARGIN_CAP_1_TIME_OFFSET_MASK) >>
+ USB4_MARGIN_CAP_1_TIME_OFFSET_SHIFT;
+ /*
+ * Store it as mUI (milli Unit Interval) because we want
+ * to keep it as integer.
+ */
+ margining->max_time_offset = 200 + 10 * val;
+ }
+
+ dir = debugfs_create_dir("margining", parent);
+ if (supports_hardware(usb4)) {
+ val = (margining->caps[1] & USB4_MARGIN_CAP_1_MIN_BER_MASK) >>
+ USB4_MARGIN_CAP_1_MIN_BER_SHIFT;
+ margining->min_ber_level = val;
+ val = (margining->caps[1] & USB4_MARGIN_CAP_1_MAX_BER_MASK) >>
+ USB4_MARGIN_CAP_1_MAX_BER_SHIFT;
+ margining->max_ber_level = val;
+
+ /* Set the default to minimum */
+ margining->ber_level = margining->min_ber_level;
+
+ debugfs_create_file("ber_level_contour", 0400, dir, port,
+ &margining_ber_level_fops);
+ }
+ debugfs_create_file("caps", 0400, dir, port, &margining_caps_fops);
+ debugfs_create_file("lanes", 0600, dir, port, &margining_lanes_fops);
+ debugfs_create_file("mode", 0600, dir, port, &margining_mode_fops);
+ debugfs_create_file("run", 0600, dir, port, &margining_run_fops);
+ debugfs_create_file("results", 0600, dir, port, &margining_results_fops);
+ debugfs_create_file("test", 0600, dir, port, &margining_test_fops);
+ if (independent_voltage_margins(usb4) ||
+ (supports_time(usb4) && independent_time_margins(usb4)))
+ debugfs_create_file("margin", 0600, dir, port, &margining_margin_fops);
+}
+
+static void margining_port_remove(struct tb_port *port)
+{
+ struct dentry *parent;
+ char dir_name[10];
+
+ if (!port->usb4)
+ return;
+
+ snprintf(dir_name, sizeof(dir_name), "port%d", port->port);
+ parent = debugfs_lookup(dir_name, port->sw->debugfs_dir);
+ if (parent)
+ debugfs_lookup_and_remove("margining", parent);
+
+ kfree(port->usb4->margining);
+ port->usb4->margining = NULL;
+}
+
+static void margining_switch_init(struct tb_switch *sw)
+{
+ struct tb_port *upstream, *downstream;
+ struct tb_switch *parent_sw;
+ u64 route = tb_route(sw);
+
+ if (!route)
+ return;
+
+ upstream = tb_upstream_port(sw);
+ parent_sw = tb_switch_parent(sw);
+ downstream = tb_port_at(route, parent_sw);
+
+ margining_port_init(downstream);
+ margining_port_init(upstream);
+}
+
+static void margining_switch_remove(struct tb_switch *sw)
+{
+ struct tb_port *upstream, *downstream;
+ struct tb_switch *parent_sw;
+ u64 route = tb_route(sw);
+
+ if (!route)
+ return;
+
+ upstream = tb_upstream_port(sw);
+ parent_sw = tb_switch_parent(sw);
+ downstream = tb_port_at(route, parent_sw);
+
+ margining_port_remove(upstream);
+ margining_port_remove(downstream);
+}
+
+static void margining_xdomain_init(struct tb_xdomain *xd)
+{
+ struct tb_switch *parent_sw;
+ struct tb_port *downstream;
+
+ parent_sw = tb_xdomain_parent(xd);
+ downstream = tb_port_at(xd->route, parent_sw);
+
+ margining_port_init(downstream);
+}
+
+static void margining_xdomain_remove(struct tb_xdomain *xd)
+{
+ struct tb_switch *parent_sw;
+ struct tb_port *downstream;
+
+ parent_sw = tb_xdomain_parent(xd);
+ downstream = tb_port_at(xd->route, parent_sw);
+ margining_port_remove(downstream);
+}
+#else
+static inline void margining_switch_init(struct tb_switch *sw) { }
+static inline void margining_switch_remove(struct tb_switch *sw) { }
+static inline void margining_xdomain_init(struct tb_xdomain *xd) { }
+static inline void margining_xdomain_remove(struct tb_xdomain *xd) { }
+#endif
+
+static int port_clear_all_counters(struct tb_port *port)
+{
+ u32 *buf;
+ int ret;
+
+ buf = kcalloc(COUNTER_SET_LEN * port->config.max_counters, sizeof(u32),
+ GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ ret = tb_port_write(port, buf, TB_CFG_COUNTERS, 0,
+ COUNTER_SET_LEN * port->config.max_counters);
+ kfree(buf);
+
+ return ret;
+}
+
+static ssize_t counters_write(struct file *file, const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct seq_file *s = file->private_data;
+ struct tb_port *port = s->private;
+ struct tb_switch *sw = port->sw;
+ struct tb *tb = port->sw->tb;
+ char *buf;
+ int ret;
+
+ buf = validate_and_copy_from_user(user_buf, &count);
+ if (IS_ERR(buf))
+ return PTR_ERR(buf);
+
+ pm_runtime_get_sync(&sw->dev);
+
+ if (mutex_lock_interruptible(&tb->lock)) {
+ ret = -ERESTARTSYS;
+ goto out;
+ }
+
+ /* If written delimiter only, clear all counters in one shot */
+ if (buf[0] == '\n') {
+ ret = port_clear_all_counters(port);
+ } else {
+ char *line = buf;
+ u32 val, offset;
+
+ ret = -EINVAL;
+ while (parse_line(&line, &offset, &val, 1, 4)) {
+ ret = tb_port_write(port, &val, TB_CFG_COUNTERS,
+ offset, 1);
+ if (ret)
+ break;
+ }
+ }
+
+ mutex_unlock(&tb->lock);
+
+out:
+ pm_runtime_mark_last_busy(&sw->dev);
+ pm_runtime_put_autosuspend(&sw->dev);
+ free_page((unsigned long)buf);
+
+ return ret < 0 ? ret : count;
+}
+
+static void cap_show_by_dw(struct seq_file *s, struct tb_switch *sw,
+ struct tb_port *port, unsigned int cap,
+ unsigned int offset, u8 cap_id, u8 vsec_id,
+ int dwords)
+{
+ int i, ret;
+ u32 data;
+
+ for (i = 0; i < dwords; i++) {
+ if (port)
+ ret = tb_port_read(port, &data, TB_CFG_PORT, cap + offset + i, 1);
+ else
+ ret = tb_sw_read(sw, &data, TB_CFG_SWITCH, cap + offset + i, 1);
+ if (ret) {
+ seq_printf(s, "0x%04x <not accessible>\n", cap + offset + i);
+ continue;
+ }
+
+ seq_printf(s, "0x%04x %4d 0x%02x 0x%02x 0x%08x\n", cap + offset + i,
+ offset + i, cap_id, vsec_id, data);
+ }
+}
+
+static void cap_show(struct seq_file *s, struct tb_switch *sw,
+ struct tb_port *port, unsigned int cap, u8 cap_id,
+ u8 vsec_id, int length)
+{
+ int ret, offset = 0;
+
+ while (length > 0) {
+ int i, dwords = min(length, TB_MAX_CONFIG_RW_LENGTH);
+ u32 data[TB_MAX_CONFIG_RW_LENGTH];
+
+ if (port)
+ ret = tb_port_read(port, data, TB_CFG_PORT, cap + offset,
+ dwords);
+ else
+ ret = tb_sw_read(sw, data, TB_CFG_SWITCH, cap + offset, dwords);
+ if (ret) {
+ cap_show_by_dw(s, sw, port, cap, offset, cap_id, vsec_id, length);
+ return;
+ }
+
+ for (i = 0; i < dwords; i++) {
+ seq_printf(s, "0x%04x %4d 0x%02x 0x%02x 0x%08x\n",
+ cap + offset + i, offset + i,
+ cap_id, vsec_id, data[i]);
+ }
+
+ length -= dwords;
+ offset += dwords;
+ }
+}
+
+static void port_cap_show(struct tb_port *port, struct seq_file *s,
+ unsigned int cap)
+{
+ struct tb_cap_any header;
+ u8 vsec_id = 0;
+ size_t length;
+ int ret;
+
+ ret = tb_port_read(port, &header, TB_CFG_PORT, cap, 1);
+ if (ret) {
+ seq_printf(s, "0x%04x <capability read failed>\n", cap);
+ return;
+ }
+
+ switch (header.basic.cap) {
+ case TB_PORT_CAP_PHY:
+ length = PORT_CAP_LANE_LEN;
+ break;
+
+ case TB_PORT_CAP_TIME1:
+ if (usb4_switch_version(port->sw) < 2)
+ length = PORT_CAP_TMU_V1_LEN;
+ else
+ length = PORT_CAP_TMU_V2_LEN;
+ break;
+
+ case TB_PORT_CAP_POWER:
+ length = PORT_CAP_POWER_LEN;
+ break;
+
+ case TB_PORT_CAP_ADAP:
+ if (tb_port_is_pcie_down(port) || tb_port_is_pcie_up(port)) {
+ if (usb4_switch_version(port->sw) < 2)
+ length = PORT_CAP_V1_PCIE_LEN;
+ else
+ length = PORT_CAP_V2_PCIE_LEN;
+ } else if (tb_port_is_dpin(port)) {
+ if (usb4_switch_version(port->sw) < 2)
+ length = PORT_CAP_DP_V1_LEN;
+ else
+ length = PORT_CAP_DP_V2_LEN;
+ } else if (tb_port_is_dpout(port)) {
+ length = PORT_CAP_DP_V1_LEN;
+ } else if (tb_port_is_usb3_down(port) ||
+ tb_port_is_usb3_up(port)) {
+ length = PORT_CAP_USB3_LEN;
+ } else {
+ seq_printf(s, "0x%04x <unsupported capability 0x%02x>\n",
+ cap, header.basic.cap);
+ return;
+ }
+ break;
+
+ case TB_PORT_CAP_VSE:
+ if (!header.extended_short.length) {
+ ret = tb_port_read(port, (u32 *)&header + 1, TB_CFG_PORT,
+ cap + 1, 1);
+ if (ret) {
+ seq_printf(s, "0x%04x <capability read failed>\n",
+ cap + 1);
+ return;
+ }
+ length = header.extended_long.length;
+ vsec_id = header.extended_short.vsec_id;
+ } else {
+ length = header.extended_short.length;
+ vsec_id = header.extended_short.vsec_id;
+ }
+ break;
+
+ case TB_PORT_CAP_USB4:
+ length = PORT_CAP_USB4_LEN;
+ break;
+
+ default:
+ seq_printf(s, "0x%04x <unsupported capability 0x%02x>\n",
+ cap, header.basic.cap);
+ return;
+ }
+
+ cap_show(s, NULL, port, cap, header.basic.cap, vsec_id, length);
+}
+
+static void port_caps_show(struct tb_port *port, struct seq_file *s)
+{
+ int cap;
+
+ cap = tb_port_next_cap(port, 0);
+ while (cap > 0) {
+ port_cap_show(port, s, cap);
+ cap = tb_port_next_cap(port, cap);
+ }
+}
+
+static int port_basic_regs_show(struct tb_port *port, struct seq_file *s)
+{
+ u32 data[PORT_CAP_BASIC_LEN];
+ int ret, i;
+
+ ret = tb_port_read(port, data, TB_CFG_PORT, 0, ARRAY_SIZE(data));
+ if (ret)
+ return ret;
+
+ for (i = 0; i < ARRAY_SIZE(data); i++)
+ seq_printf(s, "0x%04x %4d 0x00 0x00 0x%08x\n", i, i, data[i]);
+
+ return 0;
+}
+
+static int port_regs_show(struct seq_file *s, void *not_used)
+{
+ struct tb_port *port = s->private;
+ struct tb_switch *sw = port->sw;
+ struct tb *tb = sw->tb;
+ int ret;
+
+ pm_runtime_get_sync(&sw->dev);
+
+ if (mutex_lock_interruptible(&tb->lock)) {
+ ret = -ERESTARTSYS;
+ goto out_rpm_put;
+ }
+
+ seq_puts(s, "# offset relative_offset cap_id vs_cap_id value\n");
+
+ ret = port_basic_regs_show(port, s);
+ if (ret)
+ goto out_unlock;
+
+ port_caps_show(port, s);
+
+out_unlock:
+ mutex_unlock(&tb->lock);
+out_rpm_put:
+ pm_runtime_mark_last_busy(&sw->dev);
+ pm_runtime_put_autosuspend(&sw->dev);
+
+ return ret;
+}
+DEBUGFS_ATTR_RW(port_regs);
+
+static void switch_cap_show(struct tb_switch *sw, struct seq_file *s,
+ unsigned int cap)
+{
+ struct tb_cap_any header;
+ int ret, length;
+ u8 vsec_id = 0;
+
+ ret = tb_sw_read(sw, &header, TB_CFG_SWITCH, cap, 1);
+ if (ret) {
+ seq_printf(s, "0x%04x <capability read failed>\n", cap);
+ return;
+ }
+
+ if (header.basic.cap == TB_SWITCH_CAP_VSE) {
+ if (!header.extended_short.length) {
+ ret = tb_sw_read(sw, (u32 *)&header + 1, TB_CFG_SWITCH,
+ cap + 1, 1);
+ if (ret) {
+ seq_printf(s, "0x%04x <capability read failed>\n",
+ cap + 1);
+ return;
+ }
+ length = header.extended_long.length;
+ } else {
+ length = header.extended_short.length;
+ }
+ vsec_id = header.extended_short.vsec_id;
+ } else {
+ if (header.basic.cap == TB_SWITCH_CAP_TMU) {
+ length = SWITCH_CAP_TMU_LEN;
+ } else {
+ seq_printf(s, "0x%04x <unknown capability 0x%02x>\n",
+ cap, header.basic.cap);
+ return;
+ }
+ }
+
+ cap_show(s, sw, NULL, cap, header.basic.cap, vsec_id, length);
+}
+
+static void switch_caps_show(struct tb_switch *sw, struct seq_file *s)
+{
+ int cap;
+
+ cap = tb_switch_next_cap(sw, 0);
+ while (cap > 0) {
+ switch_cap_show(sw, s, cap);
+ cap = tb_switch_next_cap(sw, cap);
+ }
+}
+
+static int switch_basic_regs_show(struct tb_switch *sw, struct seq_file *s)
+{
+ u32 data[SWITCH_CAP_BASIC_LEN];
+ size_t dwords;
+ int ret, i;
+
+ /* Only USB4 has the additional registers */
+ if (tb_switch_is_usb4(sw))
+ dwords = ARRAY_SIZE(data);
+ else
+ dwords = 7;
+
+ ret = tb_sw_read(sw, data, TB_CFG_SWITCH, 0, dwords);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < dwords; i++)
+ seq_printf(s, "0x%04x %4d 0x00 0x00 0x%08x\n", i, i, data[i]);
+
+ return 0;
+}
+
+static int switch_regs_show(struct seq_file *s, void *not_used)
+{
+ struct tb_switch *sw = s->private;
+ struct tb *tb = sw->tb;
+ int ret;
+
+ pm_runtime_get_sync(&sw->dev);
+
+ if (mutex_lock_interruptible(&tb->lock)) {
+ ret = -ERESTARTSYS;
+ goto out_rpm_put;
+ }
+
+ seq_puts(s, "# offset relative_offset cap_id vs_cap_id value\n");
+
+ ret = switch_basic_regs_show(sw, s);
+ if (ret)
+ goto out_unlock;
+
+ switch_caps_show(sw, s);
+
+out_unlock:
+ mutex_unlock(&tb->lock);
+out_rpm_put:
+ pm_runtime_mark_last_busy(&sw->dev);
+ pm_runtime_put_autosuspend(&sw->dev);
+
+ return ret;
+}
+DEBUGFS_ATTR_RW(switch_regs);
+
+static int path_show_one(struct tb_port *port, struct seq_file *s, int hopid)
+{
+ u32 data[PATH_LEN];
+ int ret, i;
+
+ ret = tb_port_read(port, data, TB_CFG_HOPS, hopid * PATH_LEN,
+ ARRAY_SIZE(data));
+ if (ret) {
+ seq_printf(s, "0x%04x <not accessible>\n", hopid * PATH_LEN);
+ return ret;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(data); i++) {
+ seq_printf(s, "0x%04x %4d 0x%02x 0x%08x\n",
+ hopid * PATH_LEN + i, i, hopid, data[i]);
+ }
+
+ return 0;
+}
+
+static int path_show(struct seq_file *s, void *not_used)
+{
+ struct tb_port *port = s->private;
+ struct tb_switch *sw = port->sw;
+ struct tb *tb = sw->tb;
+ int start, i, ret = 0;
+
+ pm_runtime_get_sync(&sw->dev);
+
+ if (mutex_lock_interruptible(&tb->lock)) {
+ ret = -ERESTARTSYS;
+ goto out_rpm_put;
+ }
+
+ seq_puts(s, "# offset relative_offset in_hop_id value\n");
+
+ /* NHI and lane adapters have entry for path 0 */
+ if (tb_port_is_null(port) || tb_port_is_nhi(port)) {
+ ret = path_show_one(port, s, 0);
+ if (ret)
+ goto out_unlock;
+ }
+
+ start = tb_port_is_nhi(port) ? 1 : TB_PATH_MIN_HOPID;
+
+ for (i = start; i <= port->config.max_in_hop_id; i++) {
+ ret = path_show_one(port, s, i);
+ if (ret)
+ break;
+ }
+
+out_unlock:
+ mutex_unlock(&tb->lock);
+out_rpm_put:
+ pm_runtime_mark_last_busy(&sw->dev);
+ pm_runtime_put_autosuspend(&sw->dev);
+
+ return ret;
+}
+DEBUGFS_ATTR_RO(path);
+
+static int counter_set_regs_show(struct tb_port *port, struct seq_file *s,
+ int counter)
+{
+ u32 data[COUNTER_SET_LEN];
+ int ret, i;
+
+ ret = tb_port_read(port, data, TB_CFG_COUNTERS,
+ counter * COUNTER_SET_LEN, ARRAY_SIZE(data));
+ if (ret) {
+ seq_printf(s, "0x%04x <not accessible>\n",
+ counter * COUNTER_SET_LEN);
+ return ret;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(data); i++) {
+ seq_printf(s, "0x%04x %4d 0x%02x 0x%08x\n",
+ counter * COUNTER_SET_LEN + i, i, counter, data[i]);
+ }
+
+ return 0;
+}
+
+static int counters_show(struct seq_file *s, void *not_used)
+{
+ struct tb_port *port = s->private;
+ struct tb_switch *sw = port->sw;
+ struct tb *tb = sw->tb;
+ int i, ret = 0;
+
+ pm_runtime_get_sync(&sw->dev);
+
+ if (mutex_lock_interruptible(&tb->lock)) {
+ ret = -ERESTARTSYS;
+ goto out;
+ }
+
+ seq_puts(s, "# offset relative_offset counter_id value\n");
+
+ for (i = 0; i < port->config.max_counters; i++) {
+ ret = counter_set_regs_show(port, s, i);
+ if (ret)
+ break;
+ }
+
+ mutex_unlock(&tb->lock);
+
+out:
+ pm_runtime_mark_last_busy(&sw->dev);
+ pm_runtime_put_autosuspend(&sw->dev);
+
+ return ret;
+}
+DEBUGFS_ATTR_RW(counters);
+
+/**
+ * tb_switch_debugfs_init() - Add debugfs entries for router
+ * @sw: Pointer to the router
+ *
+ * Adds debugfs directories and files for given router.
+ */
+void tb_switch_debugfs_init(struct tb_switch *sw)
+{
+ struct dentry *debugfs_dir;
+ struct tb_port *port;
+
+ debugfs_dir = debugfs_create_dir(dev_name(&sw->dev), tb_debugfs_root);
+ sw->debugfs_dir = debugfs_dir;
+ debugfs_create_file("regs", DEBUGFS_MODE, debugfs_dir, sw,
+ &switch_regs_fops);
+
+ tb_switch_for_each_port(sw, port) {
+ struct dentry *debugfs_dir;
+ char dir_name[10];
+
+ if (port->disabled)
+ continue;
+ if (port->config.type == TB_TYPE_INACTIVE)
+ continue;
+
+ snprintf(dir_name, sizeof(dir_name), "port%d", port->port);
+ debugfs_dir = debugfs_create_dir(dir_name, sw->debugfs_dir);
+ debugfs_create_file("regs", DEBUGFS_MODE, debugfs_dir,
+ port, &port_regs_fops);
+ debugfs_create_file("path", 0400, debugfs_dir, port,
+ &path_fops);
+ if (port->config.counters_support)
+ debugfs_create_file("counters", 0600, debugfs_dir, port,
+ &counters_fops);
+ }
+
+ margining_switch_init(sw);
+}
+
+/**
+ * tb_switch_debugfs_remove() - Remove all router debugfs entries
+ * @sw: Pointer to the router
+ *
+ * Removes all previously added debugfs entries under this router.
+ */
+void tb_switch_debugfs_remove(struct tb_switch *sw)
+{
+ margining_switch_remove(sw);
+ debugfs_remove_recursive(sw->debugfs_dir);
+}
+
+void tb_xdomain_debugfs_init(struct tb_xdomain *xd)
+{
+ margining_xdomain_init(xd);
+}
+
+void tb_xdomain_debugfs_remove(struct tb_xdomain *xd)
+{
+ margining_xdomain_remove(xd);
+}
+
+/**
+ * tb_service_debugfs_init() - Add debugfs directory for service
+ * @svc: Thunderbolt service pointer
+ *
+ * Adds debugfs directory for service.
+ */
+void tb_service_debugfs_init(struct tb_service *svc)
+{
+ svc->debugfs_dir = debugfs_create_dir(dev_name(&svc->dev),
+ tb_debugfs_root);
+}
+
+/**
+ * tb_service_debugfs_remove() - Remove service debugfs directory
+ * @svc: Thunderbolt service pointer
+ *
+ * Removes the previously created debugfs directory for @svc.
+ */
+void tb_service_debugfs_remove(struct tb_service *svc)
+{
+ debugfs_remove_recursive(svc->debugfs_dir);
+ svc->debugfs_dir = NULL;
+}
+
+void tb_debugfs_init(void)
+{
+ tb_debugfs_root = debugfs_create_dir("thunderbolt", NULL);
+}
+
+void tb_debugfs_exit(void)
+{
+ debugfs_remove_recursive(tb_debugfs_root);
+}