summaryrefslogtreecommitdiff
path: root/drivers/thunderbolt/debugfs.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/thunderbolt/debugfs.c')
-rw-r--r--drivers/thunderbolt/debugfs.c1494
1 files changed, 1223 insertions, 271 deletions
diff --git a/drivers/thunderbolt/debugfs.c b/drivers/thunderbolt/debugfs.c
index e324cd899719..f8328ca7e22e 100644
--- a/drivers/thunderbolt/debugfs.c
+++ b/drivers/thunderbolt/debugfs.c
@@ -7,7 +7,10 @@
* Mika Westerberg <mika.westerberg@linux.intel.com>
*/
+#include <linux/array_size.h>
+#include <linux/bitfield.h>
#include <linux/debugfs.h>
+#include <linux/delay.h>
#include <linux/pm_runtime.h>
#include <linux/uaccess.h>
@@ -33,6 +36,70 @@
#define COUNTER_SET_LEN 3
+/*
+ * USB4 spec doesn't specify dwell range, the range of 100 ms to 500 ms
+ * probed to give good results.
+ */
+#define MIN_DWELL_TIME 100 /* ms */
+#define MAX_DWELL_TIME 500 /* ms */
+#define DWELL_SAMPLE_INTERVAL 10
+
+enum usb4_margin_cap_voltage_indp {
+ USB4_MARGIN_CAP_VOLTAGE_INDP_GEN_2_3_MIN,
+ USB4_MARGIN_CAP_VOLTAGE_INDP_GEN_2_3_HL,
+ USB4_MARGIN_CAP_VOLTAGE_INDP_GEN_2_3_BOTH,
+ USB4_MARGIN_CAP_VOLTAGE_INDP_GEN_4_MIN,
+ USB4_MARGIN_CAP_VOLTAGE_INDP_GEN_4_BOTH,
+ USB4_MARGIN_CAP_VOLTAGE_INDP_UNKNOWN,
+};
+
+enum usb4_margin_cap_time_indp {
+ USB4_MARGIN_CAP_TIME_INDP_GEN_2_3_MIN,
+ USB4_MARGIN_CAP_TIME_INDP_GEN_2_3_LR,
+ USB4_MARGIN_CAP_TIME_INDP_GEN_2_3_BOTH,
+ USB4_MARGIN_CAP_TIME_INDP_GEN_4_MIN,
+ USB4_MARGIN_CAP_TIME_INDP_GEN_4_BOTH,
+ USB4_MARGIN_CAP_TIME_INDP_UNKNOWN,
+};
+
+/* Sideband registers and their sizes as defined in the USB4 spec */
+struct sb_reg {
+ unsigned int reg;
+ unsigned int size;
+};
+
+#define SB_MAX_SIZE 64
+
+/* Sideband registers for router */
+static const struct sb_reg port_sb_regs[] = {
+ { USB4_SB_VENDOR_ID, 4 },
+ { USB4_SB_PRODUCT_ID, 4 },
+ { USB4_SB_DEBUG_CONF, 4 },
+ { USB4_SB_DEBUG, 54 },
+ { USB4_SB_LRD_TUNING, 4 },
+ { USB4_SB_OPCODE, 4 },
+ { USB4_SB_METADATA, 4 },
+ { USB4_SB_LINK_CONF, 3 },
+ { USB4_SB_GEN23_TXFFE, 4 },
+ { USB4_SB_GEN4_TXFFE, 4 },
+ { USB4_SB_VERSION, 4 },
+ { USB4_SB_DATA, 64 },
+};
+
+/* Sideband registers for retimer */
+static const struct sb_reg retimer_sb_regs[] = {
+ { USB4_SB_VENDOR_ID, 4 },
+ { USB4_SB_PRODUCT_ID, 4 },
+ { USB4_SB_FW_VERSION, 4 },
+ { USB4_SB_LRD_TUNING, 4 },
+ { USB4_SB_OPCODE, 4 },
+ { USB4_SB_METADATA, 4 },
+ { USB4_SB_GEN23_TXFFE, 4 },
+ { USB4_SB_GEN4_TXFFE, 4 },
+ { USB4_SB_VERSION, 4 },
+ { USB4_SB_DATA, 64 },
+};
+
#define DEBUGFS_ATTR(__space, __write) \
static int __space ## _open(struct inode *inode, struct file *file) \
{ \
@@ -101,6 +168,13 @@ static bool parse_line(char **line, u32 *offs, u32 *val, int short_fmt_len,
* offset relative_offset cap_id vs_cap_id value\n
* v[0] v[1] v[2] v[3] v[4]
*
+ * For Path configuration space:
+ * Short format is: offset value\n
+ * v[0] v[1]
+ * Long format as produced from the read side:
+ * offset relative_offset in_hop_id value\n
+ * v[0] v[1] v[2] v[3]
+ *
* For Counter configuration space:
* Short format is: offset\n
* v[0]
@@ -124,14 +198,33 @@ static bool parse_line(char **line, u32 *offs, u32 *val, int short_fmt_len,
}
#if IS_ENABLED(CONFIG_USB4_DEBUGFS_WRITE)
+/*
+ * Path registers need to be written in double word pairs and they both must be
+ * read before written. This writes one double word in patch config space
+ * following the spec flow.
+ */
+static int path_write_one(struct tb_port *port, u32 val, u32 offset)
+{
+ u32 index = offset % PATH_LEN;
+ u32 offs = offset - index;
+ u32 data[PATH_LEN];
+ int ret;
+
+ ret = tb_port_read(port, data, TB_CFG_HOPS, offs, PATH_LEN);
+ if (ret)
+ return ret;
+ data[index] = val;
+ return tb_port_write(port, data, TB_CFG_HOPS, offs, PATH_LEN);
+}
+
static ssize_t regs_write(struct tb_switch *sw, struct tb_port *port,
- const char __user *user_buf, size_t count,
- loff_t *ppos)
+ enum tb_cfg_space space, const char __user *user_buf,
+ size_t count, loff_t *ppos)
{
+ int long_fmt_len, ret = 0;
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))
@@ -147,12 +240,21 @@ static ssize_t regs_write(struct tb_switch *sw, struct tb_port *port,
/* User did hardware changes behind the driver's back */
add_taint(TAINT_USER, LOCKDEP_STILL_OK);
+ if (space == TB_CFG_HOPS)
+ long_fmt_len = 4;
+ else
+ long_fmt_len = 5;
+
line = buf;
- while (parse_line(&line, &offset, &val, 2, 5)) {
- if (port)
- ret = tb_port_write(port, &val, TB_CFG_PORT, offset, 1);
- else
+ while (parse_line(&line, &offset, &val, 2, long_fmt_len)) {
+ if (port) {
+ if (space == TB_CFG_HOPS)
+ ret = path_write_one(port, val, offset);
+ else
+ ret = tb_port_write(port, &val, space, offset, 1);
+ } else {
ret = tb_sw_write(sw, &val, TB_CFG_SWITCH, offset, 1);
+ }
if (ret)
break;
}
@@ -173,7 +275,16 @@ static ssize_t port_regs_write(struct file *file, const char __user *user_buf,
struct seq_file *s = file->private_data;
struct tb_port *port = s->private;
- return regs_write(port->sw, port, user_buf, count, ppos);
+ return regs_write(port->sw, port, TB_CFG_PORT, user_buf, count, ppos);
+}
+
+static ssize_t path_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, TB_CFG_HOPS, user_buf, count, ppos);
}
static ssize_t switch_regs_write(struct file *file, const char __user *user_buf,
@@ -182,18 +293,174 @@ static ssize_t switch_regs_write(struct file *file, const char __user *user_buf,
struct seq_file *s = file->private_data;
struct tb_switch *sw = s->private;
- return regs_write(sw, NULL, user_buf, count, ppos);
+ return regs_write(sw, NULL, TB_CFG_SWITCH, user_buf, count, ppos);
+}
+
+static bool parse_sb_line(char **line, u8 *reg, u8 *data, size_t data_size,
+ size_t *bytes_read)
+{
+ char *field, *token;
+ int i;
+
+ token = strsep(line, "\n");
+ if (!token)
+ return false;
+
+ /* Parse the register first */
+ field = strsep(&token, " ");
+ if (!field)
+ return false;
+ if (kstrtou8(field, 0, reg))
+ return false;
+
+ /* Then the values for the register, up to data_size */
+ for (i = 0; i < data_size; i++) {
+ field = strsep(&token, " ");
+ if (!field)
+ break;
+ if (kstrtou8(field, 0, &data[i]))
+ return false;
+ }
+
+ *bytes_read = i;
+ return true;
+}
+
+static ssize_t sb_regs_write(struct tb_port *port, const struct sb_reg *sb_regs,
+ size_t size, enum usb4_sb_target target, u8 index,
+ char *buf, size_t count, loff_t *ppos)
+{
+ u8 reg, data[SB_MAX_SIZE];
+ size_t bytes_read;
+ char *line = buf;
+
+ /* User did hardware changes behind the driver's back */
+ add_taint(TAINT_USER, LOCKDEP_STILL_OK);
+
+ /*
+ * For sideband registers we accept:
+ * reg b0 b1 b2...\n
+ *
+ * Here "reg" is the byte offset of the sideband register and "b0"..
+ * are the byte values. There can be less byte values than the register
+ * size. The leftovers will not be overwritten.
+ */
+ while (parse_sb_line(&line, &reg, data, ARRAY_SIZE(data), &bytes_read)) {
+ const struct sb_reg *sb_reg;
+ int ret;
+
+ /* At least one byte must be passed */
+ if (bytes_read < 1)
+ return -EINVAL;
+
+ /* Find the register */
+ sb_reg = NULL;
+ for (int i = 0; i < size; i++) {
+ if (sb_regs[i].reg == reg) {
+ sb_reg = &sb_regs[i];
+ break;
+ }
+ }
+
+ if (!sb_reg)
+ return -EINVAL;
+
+ if (bytes_read > sb_regs->size)
+ return -E2BIG;
+
+ ret = usb4_port_sb_write(port, target, index, sb_reg->reg, data,
+ bytes_read);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static ssize_t port_sb_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;
+ struct tb_switch *sw = port->sw;
+ struct tb *tb = 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;
+ }
+
+ ret = sb_regs_write(port, port_sb_regs, ARRAY_SIZE(port_sb_regs),
+ USB4_SB_TARGET_ROUTER, 0, buf, count, ppos);
+
+ 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 retimer_sb_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_retimer *rt = s->private;
+ struct tb *tb = rt->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(&rt->dev);
+
+ if (mutex_lock_interruptible(&tb->lock)) {
+ ret = -ERESTARTSYS;
+ goto out;
+ }
+
+ ret = sb_regs_write(rt->port, retimer_sb_regs, ARRAY_SIZE(retimer_sb_regs),
+ USB4_SB_TARGET_RETIMER, rt->index, buf, count, ppos);
+
+ mutex_unlock(&tb->lock);
+out:
+ pm_runtime_mark_last_busy(&rt->dev);
+ pm_runtime_put_autosuspend(&rt->dev);
+ free_page((unsigned long)buf);
+
+ return ret < 0 ? ret : count;
}
#define DEBUGFS_MODE 0600
#else
#define port_regs_write NULL
+#define path_write NULL
#define switch_regs_write NULL
+#define port_sb_regs_write NULL
+#define retimer_sb_regs_write NULL
#define DEBUGFS_MODE 0400
#endif
#if IS_ENABLED(CONFIG_USB4_DEBUGFS_MARGINING)
/**
* struct tb_margining - Lane margining support
+ * @port: USB4 port through which the margining operations are run
+ * @target: Sideband target
+ * @index: Retimer index if taget is %USB4_SB_TARGET_RETIMER
+ * @dev: Pointer to the device that is the target (USB4 port or retimer)
+ * @gen: Link generation
+ * @asym_rx: %true% if @port supports asymmetric link with 3 Rx
* @caps: Port lane margining capabilities
* @results: Last lane margining results
* @lanes: %0, %1 or %7 (all)
@@ -202,60 +469,146 @@ static ssize_t switch_regs_write(struct file *file, const char __user *user_buf,
* @ber_level: Current BER level contour value
* @voltage_steps: Number of mandatory voltage steps
* @max_voltage_offset: Maximum mandatory voltage offset (in mV)
+ * @voltage_steps_optional_range: Number of voltage steps for optional range
+ * @max_voltage_offset_optional_range: Maximum voltage offset for the optional
+ * range (in mV).
* @time_steps: Number of time margin steps
* @max_time_offset: Maximum time margin offset (in mUI)
+ * @voltage_time_offset: Offset for voltage / time for software margining
+ * @dwell_time: Dwell time for software margining (in ms)
+ * @error_counter: Error counter operation for software margining
+ * @optional_voltage_offset_range: Enable optional extended voltage range
* @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
+ * @upper_eye: %false if the lower PAM3 eye is used, %true if the upper
+ * eye is used
*/
struct tb_margining {
- u32 caps[2];
- u32 results[2];
- unsigned int lanes;
+ struct tb_port *port;
+ enum usb4_sb_target target;
+ u8 index;
+ struct device *dev;
+ unsigned int gen;
+ bool asym_rx;
+ u32 caps[3];
+ u32 results[3];
+ enum usb4_margining_lane 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 voltage_steps_optional_range;
+ unsigned int max_voltage_offset_optional_range;
unsigned int time_steps;
unsigned int max_time_offset;
+ unsigned int voltage_time_offset;
+ unsigned int dwell_time;
+ enum usb4_margin_sw_error_counter error_counter;
+ bool optional_voltage_offset_range;
bool software;
bool time;
bool right_high;
+ bool upper_eye;
};
-static bool supports_software(const struct usb4_port *usb4)
+static int margining_modify_error_counter(struct tb_margining *margining,
+ u32 lanes, enum usb4_margin_sw_error_counter error_counter)
+{
+ struct usb4_port_margining_params params = { 0 };
+ struct tb_port *port = margining->port;
+ u32 result;
+
+ if (error_counter != USB4_MARGIN_SW_ERROR_COUNTER_CLEAR &&
+ error_counter != USB4_MARGIN_SW_ERROR_COUNTER_STOP)
+ return -EOPNOTSUPP;
+
+ params.error_counter = error_counter;
+ params.lanes = lanes;
+
+ return usb4_port_sw_margin(port, margining->target, margining->index,
+ &params, &result);
+}
+
+static bool supports_software(const struct tb_margining *margining)
{
- return usb4->margining->caps[0] & USB4_MARGIN_CAP_0_MODES_SW;
+ if (margining->gen < 4)
+ return margining->caps[0] & USB4_MARGIN_CAP_0_MODES_SW;
+ return margining->caps[2] & USB4_MARGIN_CAP_2_MODES_SW;
}
-static bool supports_hardware(const struct usb4_port *usb4)
+static bool supports_hardware(const struct tb_margining *margining)
{
- return usb4->margining->caps[0] & USB4_MARGIN_CAP_0_MODES_HW;
+ if (margining->gen < 4)
+ return margining->caps[0] & USB4_MARGIN_CAP_0_MODES_HW;
+ return margining->caps[2] & USB4_MARGIN_CAP_2_MODES_HW;
}
-static bool both_lanes(const struct usb4_port *usb4)
+static bool all_lanes(const struct tb_margining *margining)
{
- return usb4->margining->caps[0] & USB4_MARGIN_CAP_0_2_LANES;
+ return margining->caps[0] & USB4_MARGIN_CAP_0_ALL_LANES;
}
-static unsigned int independent_voltage_margins(const struct usb4_port *usb4)
+static enum usb4_margin_cap_voltage_indp
+independent_voltage_margins(const struct tb_margining *margining)
{
- return (usb4->margining->caps[0] & USB4_MARGIN_CAP_0_VOLTAGE_INDP_MASK) >>
- USB4_MARGIN_CAP_0_VOLTAGE_INDP_SHIFT;
+ if (margining->gen < 4) {
+ switch (FIELD_GET(USB4_MARGIN_CAP_0_VOLTAGE_INDP_MASK, margining->caps[0])) {
+ case USB4_MARGIN_CAP_0_VOLTAGE_MIN:
+ return USB4_MARGIN_CAP_VOLTAGE_INDP_GEN_2_3_MIN;
+ case USB4_MARGIN_CAP_0_VOLTAGE_HL:
+ return USB4_MARGIN_CAP_VOLTAGE_INDP_GEN_2_3_HL;
+ case USB4_MARGIN_CAP_1_TIME_BOTH:
+ return USB4_MARGIN_CAP_VOLTAGE_INDP_GEN_2_3_BOTH;
+ }
+ } else {
+ switch (FIELD_GET(USB4_MARGIN_CAP_2_VOLTAGE_INDP_MASK, margining->caps[2])) {
+ case USB4_MARGIN_CAP_2_VOLTAGE_MIN:
+ return USB4_MARGIN_CAP_VOLTAGE_INDP_GEN_4_MIN;
+ case USB4_MARGIN_CAP_2_VOLTAGE_BOTH:
+ return USB4_MARGIN_CAP_VOLTAGE_INDP_GEN_4_BOTH;
+ }
+ }
+ return USB4_MARGIN_CAP_VOLTAGE_INDP_UNKNOWN;
}
-static bool supports_time(const struct usb4_port *usb4)
+static bool supports_time(const struct tb_margining *margining)
{
- return usb4->margining->caps[0] & USB4_MARGIN_CAP_0_TIME;
+ if (margining->gen < 4)
+ return margining->caps[0] & USB4_MARGIN_CAP_0_TIME;
+ return margining->caps[2] & USB4_MARGIN_CAP_2_TIME;
}
/* Only applicable if supports_time() returns true */
-static unsigned int independent_time_margins(const struct usb4_port *usb4)
+static enum usb4_margin_cap_time_indp
+independent_time_margins(const struct tb_margining *margining)
{
- return (usb4->margining->caps[1] & USB4_MARGIN_CAP_1_TIME_INDP_MASK) >>
- USB4_MARGIN_CAP_1_TIME_INDP_SHIFT;
+ if (margining->gen < 4) {
+ switch (FIELD_GET(USB4_MARGIN_CAP_1_TIME_INDP_MASK, margining->caps[1])) {
+ case USB4_MARGIN_CAP_1_TIME_MIN:
+ return USB4_MARGIN_CAP_TIME_INDP_GEN_2_3_MIN;
+ case USB4_MARGIN_CAP_1_TIME_LR:
+ return USB4_MARGIN_CAP_TIME_INDP_GEN_2_3_LR;
+ case USB4_MARGIN_CAP_1_TIME_BOTH:
+ return USB4_MARGIN_CAP_TIME_INDP_GEN_2_3_BOTH;
+ }
+ } else {
+ switch (FIELD_GET(USB4_MARGIN_CAP_2_TIME_INDP_MASK, margining->caps[2])) {
+ case USB4_MARGIN_CAP_2_TIME_MIN:
+ return USB4_MARGIN_CAP_TIME_INDP_GEN_4_MIN;
+ case USB4_MARGIN_CAP_2_TIME_BOTH:
+ return USB4_MARGIN_CAP_TIME_INDP_GEN_4_BOTH;
+ }
+ }
+ return USB4_MARGIN_CAP_TIME_INDP_UNKNOWN;
+}
+
+static bool
+supports_optional_voltage_offset_range(const struct tb_margining *margining)
+{
+ return margining->caps[0] & USB4_MARGIN_CAP_0_OPT_VOLTAGE_SUPPORT;
}
static ssize_t
@@ -263,9 +616,8 @@ 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;
+ struct tb_margining *margining = s->private;
+ struct tb *tb = margining->port->sw->tb;
unsigned int val;
int ret = 0;
char *buf;
@@ -273,7 +625,7 @@ margining_ber_level_write(struct file *file, const char __user *user_buf,
if (mutex_lock_interruptible(&tb->lock))
return -ERESTARTSYS;
- if (usb4->margining->software) {
+ if (margining->software) {
ret = -EINVAL;
goto out_unlock;
}
@@ -290,13 +642,13 @@ margining_ber_level_write(struct file *file, const char __user *user_buf,
if (ret)
goto out_free;
- if (val < usb4->margining->min_ber_level ||
- val > usb4->margining->max_ber_level) {
+ if (val < margining->min_ber_level ||
+ val > margining->max_ber_level) {
ret = -EINVAL;
goto out_free;
}
- usb4->margining->ber_level = val;
+ margining->ber_level = val;
out_free:
free_page((unsigned long)buf);
@@ -316,102 +668,151 @@ static void ber_level_show(struct seq_file *s, unsigned int 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;
+ const struct tb_margining *margining = s->private;
- if (usb4->margining->software)
+ if (margining->software)
return -EINVAL;
- ber_level_show(s, usb4->margining->ber_level);
+ ber_level_show(s, 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;
+ struct tb_margining *margining = s->private;
+ struct tb *tb = margining->port->sw->tb;
+ int ret = 0;
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);
+ for (int i = 0; i < ARRAY_SIZE(margining->caps); i++)
+ seq_printf(s, "0x%08x\n", margining->caps[i]);
seq_printf(s, "# software margining: %s\n",
- supports_software(usb4) ? "yes" : "no");
- if (supports_hardware(usb4)) {
+ supports_software(margining) ? "yes" : "no");
+ if (supports_hardware(margining)) {
seq_puts(s, "# hardware margining: yes\n");
seq_puts(s, "# minimum BER level contour: ");
- ber_level_show(s, usb4->margining->min_ber_level);
+ ber_level_show(s, margining->min_ber_level);
seq_puts(s, "# maximum BER level contour: ");
- ber_level_show(s, usb4->margining->max_ber_level);
+ ber_level_show(s, 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, "# all lanes simultaneously: %s\n",
+ str_yes_no(all_lanes(margining)));
seq_printf(s, "# voltage margin steps: %u\n",
- usb4->margining->voltage_steps);
+ margining->voltage_steps);
seq_printf(s, "# maximum voltage offset: %u mV\n",
- usb4->margining->max_voltage_offset);
+ margining->max_voltage_offset);
+ seq_printf(s, "# optional voltage offset range support: %s\n",
+ str_yes_no(supports_optional_voltage_offset_range(margining)));
+ if (supports_optional_voltage_offset_range(margining)) {
+ seq_printf(s, "# voltage margin steps, optional range: %u\n",
+ margining->voltage_steps_optional_range);
+ seq_printf(s, "# maximum voltage offset, optional range: %u mV\n",
+ margining->max_voltage_offset_optional_range);
+ }
- switch (independent_voltage_margins(usb4)) {
- case USB4_MARGIN_CAP_0_VOLTAGE_MIN:
+ switch (independent_voltage_margins(margining)) {
+ case USB4_MARGIN_CAP_VOLTAGE_INDP_GEN_2_3_MIN:
seq_puts(s, "# returns minimum between high and low voltage margins\n");
break;
- case USB4_MARGIN_CAP_0_VOLTAGE_HL:
+ case USB4_MARGIN_CAP_VOLTAGE_INDP_GEN_2_3_HL:
seq_puts(s, "# returns high or low voltage margin\n");
break;
- case USB4_MARGIN_CAP_0_VOLTAGE_BOTH:
+ case USB4_MARGIN_CAP_VOLTAGE_INDP_GEN_2_3_BOTH:
seq_puts(s, "# returns both high and low margins\n");
break;
+ case USB4_MARGIN_CAP_VOLTAGE_INDP_GEN_4_MIN:
+ seq_puts(s, "# returns minimum between high and low voltage margins in both lower and upper eye\n");
+ break;
+ case USB4_MARGIN_CAP_VOLTAGE_INDP_GEN_4_BOTH:
+ seq_puts(s, "# returns both high and low margins of both upper and lower eye\n");
+ break;
+ case USB4_MARGIN_CAP_VOLTAGE_INDP_UNKNOWN:
+ tb_port_warn(margining->port,
+ "failed to parse independent voltage margining capabilities\n");
+ ret = -EIO;
+ goto out;
}
- if (supports_time(usb4)) {
+ if (supports_time(margining)) {
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");
+ str_yes_no(margining->caps[1] & USB4_MARGIN_CAP_1_TIME_DESTR));
- switch (independent_time_margins(usb4)) {
- case USB4_MARGIN_CAP_1_TIME_MIN:
+ switch (independent_time_margins(margining)) {
+ case USB4_MARGIN_CAP_TIME_INDP_GEN_2_3_MIN:
seq_puts(s, "# returns minimum between left and right time margins\n");
break;
- case USB4_MARGIN_CAP_1_TIME_LR:
+ case USB4_MARGIN_CAP_TIME_INDP_GEN_2_3_LR:
seq_puts(s, "# returns left or right margin\n");
break;
- case USB4_MARGIN_CAP_1_TIME_BOTH:
+ case USB4_MARGIN_CAP_TIME_INDP_GEN_2_3_BOTH:
seq_puts(s, "# returns both left and right margins\n");
break;
+ case USB4_MARGIN_CAP_TIME_INDP_GEN_4_MIN:
+ seq_puts(s, "# returns minimum between left and right time margins in both lower and upper eye\n");
+ break;
+ case USB4_MARGIN_CAP_TIME_INDP_GEN_4_BOTH:
+ seq_puts(s, "# returns both left and right margins of both upper and lower eye\n");
+ break;
+ case USB4_MARGIN_CAP_TIME_INDP_UNKNOWN:
+ tb_port_warn(margining->port,
+ "failed to parse independent time margining capabilities\n");
+ ret = -EIO;
+ goto out;
}
seq_printf(s, "# time margin steps: %u\n",
- usb4->margining->time_steps);
+ margining->time_steps);
seq_printf(s, "# maximum time offset: %u mUI\n",
- usb4->margining->max_time_offset);
+ margining->max_time_offset);
} else {
seq_puts(s, "# time margining: no\n");
}
+out:
mutex_unlock(&tb->lock);
- return 0;
+ return ret;
}
DEBUGFS_ATTR_RO(margining_caps);
+static const struct {
+ enum usb4_margining_lane lane;
+ const char *name;
+} lane_names[] = {
+ {
+ .lane = USB4_MARGINING_LANE_RX0,
+ .name = "0",
+ },
+ {
+ .lane = USB4_MARGINING_LANE_RX1,
+ .name = "1",
+ },
+ {
+ .lane = USB4_MARGINING_LANE_RX2,
+ .name = "2",
+ },
+ {
+ .lane = USB4_MARGINING_LANE_ALL,
+ .name = "all",
+ },
+};
+
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_margining *margining = s->private;
+ struct tb_port *port = margining->port;
struct tb *tb = port->sw->tb;
- int ret = 0;
+ int lane = -1;
char *buf;
buf = validate_and_copy_from_user(user_buf, &count);
@@ -420,70 +821,263 @@ margining_lanes_write(struct file *file, const char __user *user_buf,
buf[count - 1] = '\0';
- if (mutex_lock_interruptible(&tb->lock)) {
- ret = -ERESTARTSYS;
- goto out_free;
+ for (int i = 0; i < ARRAY_SIZE(lane_names); i++) {
+ if (!strcmp(buf, lane_names[i].name)) {
+ lane = lane_names[i].lane;
+ break;
+ }
}
- 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;
- }
+ free_page((unsigned long)buf);
- mutex_unlock(&tb->lock);
+ if (lane == -1)
+ return -EINVAL;
-out_free:
- free_page((unsigned long)buf);
- return ret < 0 ? ret : count;
+ scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &tb->lock) {
+ if (lane == USB4_MARGINING_LANE_ALL && !all_lanes(margining))
+ return -EINVAL;
+ /*
+ * Enabling on RX2 requires that it is supported by the
+ * USB4 port.
+ */
+ if (lane == USB4_MARGINING_LANE_RX2 && !margining->asym_rx)
+ return -EINVAL;
+
+ margining->lanes = lane;
+ }
+
+ return 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_margining *margining = s->private;
+ struct tb_port *port = margining->port;
struct tb *tb = port->sw->tb;
- unsigned int lanes;
- if (mutex_lock_interruptible(&tb->lock))
- return -ERESTARTSYS;
+ scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &tb->lock) {
+ for (int i = 0; i < ARRAY_SIZE(lane_names); i++) {
+ if (lane_names[i].lane == USB4_MARGINING_LANE_ALL &&
+ !all_lanes(margining))
+ continue;
+ if (lane_names[i].lane == USB4_MARGINING_LANE_RX2 &&
+ !margining->asym_rx)
+ continue;
- 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");
+ if (i != 0)
+ seq_putc(s, ' ');
+
+ if (lane_names[i].lane == margining->lanes)
+ seq_printf(s, "[%s]", lane_names[i].name);
+ else
+ seq_printf(s, "%s", lane_names[i].name);
+ }
+ seq_puts(s, "\n");
}
- mutex_unlock(&tb->lock);
return 0;
}
DEBUGFS_ATTR_RW(margining_lanes);
+static ssize_t
+margining_voltage_time_offset_write(struct file *file,
+ const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct seq_file *s = file->private_data;
+ struct tb_margining *margining = s->private;
+ struct tb *tb = margining->port->sw->tb;
+ unsigned int max_margin;
+ unsigned int val;
+ int ret;
+
+ ret = kstrtouint_from_user(user_buf, count, 10, &val);
+ if (ret)
+ return ret;
+
+ scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &tb->lock) {
+ if (!margining->software)
+ return -EOPNOTSUPP;
+
+ if (margining->time)
+ max_margin = margining->time_steps;
+ else
+ if (margining->optional_voltage_offset_range)
+ max_margin = margining->voltage_steps_optional_range;
+ else
+ max_margin = margining->voltage_steps;
+
+ margining->voltage_time_offset = clamp(val, 0, max_margin);
+ }
+
+ return count;
+}
+
+static int margining_voltage_time_offset_show(struct seq_file *s,
+ void *not_used)
+{
+ const struct tb_margining *margining = s->private;
+ struct tb *tb = margining->port->sw->tb;
+
+ scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &tb->lock) {
+ if (!margining->software)
+ return -EOPNOTSUPP;
+
+ seq_printf(s, "%d\n", margining->voltage_time_offset);
+ }
+
+ return 0;
+}
+DEBUGFS_ATTR_RW(margining_voltage_time_offset);
+
+static ssize_t
+margining_error_counter_write(struct file *file, const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ enum usb4_margin_sw_error_counter error_counter;
+ struct seq_file *s = file->private_data;
+ struct tb_margining *margining = s->private;
+ struct tb *tb = margining->port->sw->tb;
+ char *buf;
+
+ buf = validate_and_copy_from_user(user_buf, &count);
+ if (IS_ERR(buf))
+ return PTR_ERR(buf);
+
+ buf[count - 1] = '\0';
+
+ if (!strcmp(buf, "nop"))
+ error_counter = USB4_MARGIN_SW_ERROR_COUNTER_NOP;
+ else if (!strcmp(buf, "clear"))
+ error_counter = USB4_MARGIN_SW_ERROR_COUNTER_CLEAR;
+ else if (!strcmp(buf, "start"))
+ error_counter = USB4_MARGIN_SW_ERROR_COUNTER_START;
+ else if (!strcmp(buf, "stop"))
+ error_counter = USB4_MARGIN_SW_ERROR_COUNTER_STOP;
+ else
+ return -EINVAL;
+
+ scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &tb->lock) {
+ if (!margining->software)
+ return -EOPNOTSUPP;
+
+ margining->error_counter = error_counter;
+ }
+
+ return count;
+}
+
+static int margining_error_counter_show(struct seq_file *s, void *not_used)
+{
+ const struct tb_margining *margining = s->private;
+ struct tb *tb = margining->port->sw->tb;
+
+ scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &tb->lock) {
+ if (!margining->software)
+ return -EOPNOTSUPP;
+
+ switch (margining->error_counter) {
+ case USB4_MARGIN_SW_ERROR_COUNTER_NOP:
+ seq_puts(s, "[nop] clear start stop\n");
+ break;
+ case USB4_MARGIN_SW_ERROR_COUNTER_CLEAR:
+ seq_puts(s, "nop [clear] start stop\n");
+ break;
+ case USB4_MARGIN_SW_ERROR_COUNTER_START:
+ seq_puts(s, "nop clear [start] stop\n");
+ break;
+ case USB4_MARGIN_SW_ERROR_COUNTER_STOP:
+ seq_puts(s, "nop clear start [stop]\n");
+ break;
+ }
+ }
+
+ return 0;
+}
+DEBUGFS_ATTR_RW(margining_error_counter);
+
+static ssize_t
+margining_dwell_time_write(struct file *file, const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct seq_file *s = file->private_data;
+ struct tb_margining *margining = s->private;
+ struct tb *tb = margining->port->sw->tb;
+ unsigned int val;
+ int ret;
+
+ ret = kstrtouint_from_user(user_buf, count, 10, &val);
+ if (ret)
+ return ret;
+
+ scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &tb->lock) {
+ if (!margining->software)
+ return -EOPNOTSUPP;
+
+ margining->dwell_time = clamp(val, MIN_DWELL_TIME, MAX_DWELL_TIME);
+ }
+
+ return count;
+}
+
+static int margining_dwell_time_show(struct seq_file *s, void *not_used)
+{
+ struct tb_margining *margining = s->private;
+ struct tb *tb = margining->port->sw->tb;
+
+ scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &tb->lock) {
+ if (!margining->software)
+ return -EOPNOTSUPP;
+
+ seq_printf(s, "%d\n", margining->dwell_time);
+ }
+
+ return 0;
+}
+DEBUGFS_ATTR_RW(margining_dwell_time);
+
+static ssize_t
+margining_optional_voltage_offset_write(struct file *file, const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct seq_file *s = file->private_data;
+ struct tb_margining *margining = s->private;
+ struct tb *tb = margining->port->sw->tb;
+ bool val;
+ int ret;
+
+ ret = kstrtobool_from_user(user_buf, count, &val);
+ if (ret)
+ return ret;
+
+ scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &tb->lock) {
+ margining->optional_voltage_offset_range = val;
+ }
+
+ return count;
+}
+
+static int margining_optional_voltage_offset_show(struct seq_file *s,
+ void *not_used)
+{
+ struct tb_margining *margining = s->private;
+ struct tb *tb = margining->port->sw->tb;
+
+ scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &tb->lock) {
+ seq_printf(s, "%u\n", margining->optional_voltage_offset_range);
+ }
+
+ return 0;
+}
+DEBUGFS_ATTR_RW(margining_optional_voltage_offset);
+
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;
+ struct tb_margining *margining = s->private;
+ struct tb *tb = margining->port->sw->tb;
int ret = 0;
char *buf;
@@ -499,13 +1093,13 @@ static ssize_t margining_mode_write(struct file *file,
}
if (!strcmp(buf, "software")) {
- if (supports_software(usb4))
- usb4->margining->software = true;
+ if (supports_software(margining))
+ margining->software = true;
else
ret = -EINVAL;
} else if (!strcmp(buf, "hardware")) {
- if (supports_hardware(usb4))
- usb4->margining->software = false;
+ if (supports_hardware(margining))
+ margining->software = false;
else
ret = -EINVAL;
} else {
@@ -521,23 +1115,22 @@ out_free:
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;
+ struct tb_margining *margining = s->private;
+ struct tb *tb = margining->port->sw->tb;
const char *space = "";
if (mutex_lock_interruptible(&tb->lock))
return -ERESTARTSYS;
- if (supports_software(usb4)) {
- if (usb4->margining->software)
+ if (supports_software(margining)) {
+ if (margining->software)
seq_puts(s, "[software]");
else
seq_puts(s, "software");
space = " ";
}
- if (supports_hardware(usb4)) {
- if (usb4->margining->software)
+ if (supports_hardware(margining)) {
+ if (margining->software)
seq_printf(s, "%shardware", space);
else
seq_printf(s, "%s[hardware]", space);
@@ -550,12 +1143,85 @@ static int margining_mode_show(struct seq_file *s, void *not_used)
}
DEBUGFS_ATTR_RW(margining_mode);
+static int margining_run_sw(struct tb_margining *margining,
+ struct usb4_port_margining_params *params)
+{
+ u32 nsamples = margining->dwell_time / DWELL_SAMPLE_INTERVAL;
+ int ret, i;
+
+ ret = usb4_port_sw_margin(margining->port, margining->target, margining->index,
+ params, margining->results);
+ if (ret)
+ goto out_stop;
+
+ for (i = 0; i <= nsamples; i++) {
+ u32 errors = 0;
+
+ ret = usb4_port_sw_margin_errors(margining->port, margining->target,
+ margining->index, &margining->results[1]);
+ if (ret)
+ break;
+
+ if (margining->lanes == USB4_MARGINING_LANE_RX0)
+ errors = FIELD_GET(USB4_MARGIN_SW_ERR_COUNTER_LANE_0_MASK,
+ margining->results[1]);
+ else if (margining->lanes == USB4_MARGINING_LANE_RX1)
+ errors = FIELD_GET(USB4_MARGIN_SW_ERR_COUNTER_LANE_1_MASK,
+ margining->results[1]);
+ else if (margining->lanes == USB4_MARGINING_LANE_RX2)
+ errors = FIELD_GET(USB4_MARGIN_SW_ERR_COUNTER_LANE_2_MASK,
+ margining->results[1]);
+ else if (margining->lanes == USB4_MARGINING_LANE_ALL)
+ errors = margining->results[1];
+
+ /* Any errors stop the test */
+ if (errors)
+ break;
+
+ fsleep(DWELL_SAMPLE_INTERVAL * USEC_PER_MSEC);
+ }
+
+out_stop:
+ /*
+ * Stop the counters but don't clear them to allow the
+ * different error counter configurations.
+ */
+ margining_modify_error_counter(margining, margining->lanes,
+ USB4_MARGIN_SW_ERROR_COUNTER_STOP);
+ return ret;
+}
+
+static int validate_margining(struct tb_margining *margining)
+{
+ /*
+ * For running on RX2 the link must be asymmetric with 3
+ * receivers. Because this is can change dynamically, check it
+ * here before we start the margining and report back error if
+ * expectations are not met.
+ */
+ if (margining->lanes == USB4_MARGINING_LANE_RX2) {
+ int ret;
+
+ ret = tb_port_get_link_width(margining->port);
+ if (ret < 0)
+ return ret;
+ if (ret != TB_LINK_WIDTH_ASYM_RX) {
+ tb_port_warn(margining->port, "link is %s expected %s",
+ tb_width_name(ret),
+ tb_width_name(TB_LINK_WIDTH_ASYM_RX));
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
static int margining_run_write(void *data, u64 val)
{
- struct tb_port *port = data;
- struct usb4_port *usb4 = port->usb4;
+ struct tb_margining *margining = data;
+ struct tb_port *port = margining->port;
+ struct device *dev = margining->dev;
struct tb_switch *sw = port->sw;
- struct tb_margining *margining;
struct tb_switch *down_sw;
struct tb *tb = sw->tb;
int ret, clx;
@@ -563,13 +1229,17 @@ static int margining_run_write(void *data, u64 val)
if (val != 1)
return -EINVAL;
- pm_runtime_get_sync(&sw->dev);
+ pm_runtime_get_sync(dev);
if (mutex_lock_interruptible(&tb->lock)) {
ret = -ERESTARTSYS;
goto out_rpm_put;
}
+ ret = validate_margining(margining);
+ if (ret)
+ goto out_unlock;
+
if (tb_is_upstream_port(port))
down_sw = sw;
else if (port->remote)
@@ -590,37 +1260,52 @@ static int margining_run_write(void *data, u64 val)
clx = ret;
}
- margining = usb4->margining;
+ /* Clear the results */
+ memset(margining->results, 0, sizeof(margining->results));
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]);
+ struct usb4_port_margining_params params = {
+ .error_counter = USB4_MARGIN_SW_ERROR_COUNTER_CLEAR,
+ .lanes = margining->lanes,
+ .time = margining->time,
+ .voltage_time_offset = margining->voltage_time_offset,
+ .right_high = margining->right_high,
+ .upper_eye = margining->upper_eye,
+ .optional_voltage_offset_range = margining->optional_voltage_offset_range,
+ };
+
+ tb_port_dbg(port,
+ "running software %s lane margining for %s lanes %u\n",
+ margining->time ? "time" : "voltage", dev_name(dev),
+ margining->lanes);
+
+ ret = margining_run_sw(margining, &params);
} 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);
+ struct usb4_port_margining_params params = {
+ .ber_level = margining->ber_level,
+ .lanes = margining->lanes,
+ .time = margining->time,
+ .right_high = margining->right_high,
+ .upper_eye = margining->upper_eye,
+ .optional_voltage_offset_range = margining->optional_voltage_offset_range,
+ };
+
+ tb_port_dbg(port,
+ "running hardware %s lane margining for %s lanes %u\n",
+ margining->time ? "time" : "voltage", dev_name(dev),
+ margining->lanes);
+
+ ret = usb4_port_hw_margin(port, margining->target, margining->index, &params,
+ margining->results, ARRAY_SIZE(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);
+ pm_runtime_mark_last_busy(dev);
+ pm_runtime_put_autosuspend(dev);
return ret;
}
@@ -632,16 +1317,21 @@ static ssize_t margining_results_write(struct file *file,
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;
+ struct tb_margining *margining = s->private;
+ struct tb *tb = margining->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;
+ memset(margining->results, 0, sizeof(margining->results));
+
+ if (margining->software) {
+ /* Clear the error counters */
+ margining_modify_error_counter(margining,
+ USB4_MARGINING_LANE_ALL,
+ USB4_MARGIN_SW_ERROR_COUNTER_CLEAR);
+ }
mutex_unlock(&tb->lock);
return count;
@@ -652,12 +1342,14 @@ static void voltage_margin_show(struct seq_file *s,
{
unsigned int tmp, voltage;
- tmp = val & USB4_MARGIN_HW_RES_1_MARGIN_MASK;
+ tmp = FIELD_GET(USB4_MARGIN_HW_RES_MARGIN_MASK, val);
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)
+ if (val & USB4_MARGIN_HW_RES_EXCEEDS)
seq_puts(s, " exceeds maximum");
seq_puts(s, "\n");
+ if (margining->optional_voltage_offset_range)
+ seq_puts(s, " optional voltage offset range enabled\n");
}
static void time_margin_show(struct seq_file *s,
@@ -665,73 +1357,106 @@ static void time_margin_show(struct seq_file *s,
{
unsigned int tmp, interval;
- tmp = val & USB4_MARGIN_HW_RES_1_MARGIN_MASK;
+ tmp = FIELD_GET(USB4_MARGIN_HW_RES_MARGIN_MASK, val);
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)
+ if (val & USB4_MARGIN_HW_RES_EXCEEDS)
seq_puts(s, " exceeds maximum");
seq_puts(s, "\n");
}
+static u8 margining_hw_result_val(const u32 *results,
+ enum usb4_margining_lane lane,
+ bool right_high)
+{
+ u32 val;
+
+ if (lane == USB4_MARGINING_LANE_RX0)
+ val = results[1];
+ else if (lane == USB4_MARGINING_LANE_RX1)
+ val = results[1] >> USB4_MARGIN_HW_RES_LANE_SHIFT;
+ else if (lane == USB4_MARGINING_LANE_RX2)
+ val = results[2];
+ else
+ val = 0;
+
+ return right_high ? val : val >> USB4_MARGIN_HW_RES_LL_SHIFT;
+}
+
+static void margining_hw_result_format(struct seq_file *s,
+ const struct tb_margining *margining,
+ enum usb4_margining_lane lane)
+{
+ u8 val;
+
+ if (margining->time) {
+ val = margining_hw_result_val(margining->results, lane, true);
+ seq_printf(s, "# lane %u right time margin: ", lane);
+ time_margin_show(s, margining, val);
+ val = margining_hw_result_val(margining->results, lane, false);
+ seq_printf(s, "# lane %u left time margin: ", lane);
+ time_margin_show(s, margining, val);
+ } else {
+ val = margining_hw_result_val(margining->results, lane, true);
+ seq_printf(s, "# lane %u high voltage margin: ", lane);
+ voltage_margin_show(s, margining, val);
+ val = margining_hw_result_val(margining->results, lane, false);
+ seq_printf(s, "# lane %u low voltage margin: ", lane);
+ voltage_margin_show(s, margining, val);
+ }
+}
+
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;
+ struct tb_margining *margining = s->private;
+ struct tb *tb = margining->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;
+ for (int i = 1; i < ARRAY_SIZE(margining->results); i++)
+ seq_printf(s, "0x%08x\n", margining->results[i]);
+
+ if (margining->lanes == USB4_MARGINING_LANE_ALL) {
+ margining_hw_result_format(s, margining,
+ USB4_MARGINING_LANE_RX0);
+ margining_hw_result_format(s, margining,
+ USB4_MARGINING_LANE_RX1);
+ if (margining->asym_rx)
+ margining_hw_result_format(s, margining,
+ USB4_MARGINING_LANE_RX2);
+ } else {
+ margining_hw_result_format(s, margining,
+ margining->lanes);
+ }
+ } else {
+ u32 lane_errors, result;
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);
- }
+ result = FIELD_GET(USB4_MARGIN_SW_LANES_MASK, margining->results[0]);
+ if (result == USB4_MARGINING_LANE_RX0 ||
+ result == USB4_MARGINING_LANE_ALL) {
+ lane_errors = FIELD_GET(USB4_MARGIN_SW_ERR_COUNTER_LANE_0_MASK,
+ margining->results[1]);
+ seq_printf(s, "# lane 0 errors: %u\n", lane_errors);
+ }
+ if (result == USB4_MARGINING_LANE_RX1 ||
+ result == USB4_MARGINING_LANE_ALL) {
+ lane_errors = FIELD_GET(USB4_MARGIN_SW_ERR_COUNTER_LANE_1_MASK,
+ margining->results[1]);
+ seq_printf(s, "# lane 1 errors: %u\n", lane_errors);
+ }
+ if (margining->asym_rx &&
+ (result == USB4_MARGINING_LANE_RX2 ||
+ result == USB4_MARGINING_LANE_ALL)) {
+ lane_errors = FIELD_GET(USB4_MARGIN_SW_ERR_COUNTER_LANE_2_MASK,
+ margining->results[1]);
+ seq_printf(s, "# lane 2 errors: %u\n", lane_errors);
}
}
@@ -745,9 +1470,8 @@ static ssize_t margining_test_write(struct file *file,
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;
+ struct tb_margining *margining = s->private;
+ struct tb *tb = margining->port->sw->tb;
int ret = 0;
char *buf;
@@ -762,10 +1486,10 @@ static ssize_t margining_test_write(struct file *file,
goto out_free;
}
- if (!strcmp(buf, "time") && supports_time(usb4))
- usb4->margining->time = true;
+ if (!strcmp(buf, "time") && supports_time(margining))
+ margining->time = true;
else if (!strcmp(buf, "voltage"))
- usb4->margining->time = false;
+ margining->time = false;
else
ret = -EINVAL;
@@ -778,15 +1502,14 @@ out_free:
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;
+ struct tb_margining *margining = s->private;
+ struct tb *tb = margining->port->sw->tb;
if (mutex_lock_interruptible(&tb->lock))
return -ERESTARTSYS;
- if (supports_time(usb4)) {
- if (usb4->margining->time)
+ if (supports_time(margining)) {
+ if (margining->time)
seq_puts(s, "voltage [time]\n");
else
seq_puts(s, "[voltage] time\n");
@@ -804,9 +1527,8 @@ static ssize_t margining_margin_write(struct file *file,
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;
+ struct tb_margining *margining = s->private;
+ struct tb *tb = margining->port->sw->tb;
int ret = 0;
char *buf;
@@ -821,18 +1543,18 @@ static ssize_t margining_margin_write(struct file *file,
goto out_free;
}
- if (usb4->margining->time) {
+ if (margining->time) {
if (!strcmp(buf, "left"))
- usb4->margining->right_high = false;
+ margining->right_high = false;
else if (!strcmp(buf, "right"))
- usb4->margining->right_high = true;
+ margining->right_high = true;
else
ret = -EINVAL;
} else {
if (!strcmp(buf, "low"))
- usb4->margining->right_high = false;
+ margining->right_high = false;
else if (!strcmp(buf, "high"))
- usb4->margining->right_high = true;
+ margining->right_high = true;
else
ret = -EINVAL;
}
@@ -846,20 +1568,19 @@ out_free:
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;
+ struct tb_margining *margining = s->private;
+ struct tb *tb = margining->port->sw->tb;
if (mutex_lock_interruptible(&tb->lock))
return -ERESTARTSYS;
- if (usb4->margining->time) {
- if (usb4->margining->right_high)
+ if (margining->time) {
+ if (margining->right_high)
seq_puts(s, "left [right]\n");
else
seq_puts(s, "[left] right\n");
} else {
- if (usb4->margining->right_high)
+ if (margining->right_high)
seq_puts(s, "low [high]\n");
else
seq_puts(s, "[low] high\n");
@@ -870,51 +1591,118 @@ static int margining_margin_show(struct seq_file *s, void *not_used)
}
DEBUGFS_ATTR_RW(margining_margin);
-static void margining_port_init(struct tb_port *port)
+static ssize_t margining_eye_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';
+
+ scoped_cond_guard(mutex_intr, ret = -ERESTARTSYS, &tb->lock) {
+ if (!strcmp(buf, "lower"))
+ usb4->margining->upper_eye = false;
+ else if (!strcmp(buf, "upper"))
+ usb4->margining->upper_eye = true;
+ else
+ ret = -EINVAL;
+ }
+
+ free_page((unsigned long)buf);
+ return ret ? ret : count;
+}
+
+static int margining_eye_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;
+
+ scoped_guard(mutex_intr, &tb->lock) {
+ if (usb4->margining->upper_eye)
+ seq_puts(s, "lower [upper]\n");
+ else
+ seq_puts(s, "[lower] upper\n");
+
+ return 0;
+ }
+
+ return -ERESTARTSYS;
+}
+DEBUGFS_ATTR_RW(margining_eye);
+
+static struct tb_margining *margining_alloc(struct tb_port *port,
+ struct device *dev,
+ enum usb4_sb_target target,
+ u8 index, struct dentry *parent)
{
struct tb_margining *margining;
- struct dentry *dir, *parent;
- struct usb4_port *usb4;
- char dir_name[10];
+ struct dentry *dir;
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);
+ ret = tb_port_get_link_generation(port);
+ if (ret < 0) {
+ tb_port_warn(port, "failed to read link generation\n");
+ return NULL;
+ }
margining = kzalloc(sizeof(*margining), GFP_KERNEL);
if (!margining)
- return;
+ return NULL;
- ret = usb4_port_margining_caps(port, margining->caps);
+ margining->port = port;
+ margining->target = target;
+ margining->index = index;
+ margining->dev = dev;
+ margining->gen = ret;
+ margining->asym_rx = tb_port_width_supported(port, TB_LINK_WIDTH_ASYM_RX);
+
+ ret = usb4_port_margining_caps(port, target, index, margining->caps,
+ ARRAY_SIZE(margining->caps));
if (ret) {
kfree(margining);
- return;
+ return NULL;
}
- usb4->margining = margining;
-
/* Set the initial mode */
- if (supports_software(usb4))
+ if (supports_software(margining))
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 (margining->gen < 4) {
+ val = FIELD_GET(USB4_MARGIN_CAP_0_VOLTAGE_STEPS_MASK, margining->caps[0]);
+ margining->voltage_steps = val;
+ val = FIELD_GET(USB4_MARGIN_CAP_0_MAX_VOLTAGE_OFFSET_MASK, margining->caps[0]);
+ margining->max_voltage_offset = 74 + val * 2;
+ } else {
+ val = FIELD_GET(USB4_MARGIN_CAP_2_VOLTAGE_STEPS_MASK, margining->caps[2]);
+ margining->voltage_steps = val;
+ val = FIELD_GET(USB4_MARGIN_CAP_2_MAX_VOLTAGE_OFFSET_MASK, margining->caps[2]);
+ margining->max_voltage_offset = 74 + val * 2;
+ }
+
+ if (supports_optional_voltage_offset_range(margining)) {
+ val = FIELD_GET(USB4_MARGIN_CAP_0_VOLT_STEPS_OPT_MASK,
+ margining->caps[0]);
+ margining->voltage_steps_optional_range = val;
+ val = FIELD_GET(USB4_MARGIN_CAP_1_MAX_VOLT_OFS_OPT_MASK,
+ margining->caps[1]);
+ margining->max_voltage_offset_optional_range = 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;
+ if (supports_time(margining)) {
+ val = FIELD_GET(USB4_MARGIN_CAP_1_TIME_STEPS_MASK, margining->caps[1]);
margining->time_steps = val;
- val = (margining->caps[1] & USB4_MARGIN_CAP_1_TIME_OFFSET_MASK) >>
- USB4_MARGIN_CAP_1_TIME_OFFSET_SHIFT;
+ val = FIELD_GET(USB4_MARGIN_CAP_1_TIME_OFFSET_MASK, margining->caps[1]);
/*
* Store it as mUI (milli Unit Interval) because we want
* to keep it as integer.
@@ -923,29 +1711,65 @@ static void margining_port_init(struct tb_port *port)
}
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;
+ if (supports_hardware(margining)) {
+ val = FIELD_GET(USB4_MARGIN_CAP_1_MIN_BER_MASK, margining->caps[1]);
margining->min_ber_level = val;
- val = (margining->caps[1] & USB4_MARGIN_CAP_1_MAX_BER_MASK) >>
- USB4_MARGIN_CAP_1_MAX_BER_SHIFT;
+ val = FIELD_GET(USB4_MARGIN_CAP_1_MAX_BER_MASK, margining->caps[1]);
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,
+ debugfs_create_file("ber_level_contour", 0400, dir, margining,
&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);
+ debugfs_create_file("caps", 0400, dir, margining, &margining_caps_fops);
+ debugfs_create_file("lanes", 0600, dir, margining, &margining_lanes_fops);
+ debugfs_create_file("mode", 0600, dir, margining, &margining_mode_fops);
+ debugfs_create_file("run", 0600, dir, margining, &margining_run_fops);
+ debugfs_create_file("results", 0600, dir, margining,
+ &margining_results_fops);
+ debugfs_create_file("test", 0600, dir, margining, &margining_test_fops);
+ if (independent_voltage_margins(margining) == USB4_MARGIN_CAP_VOLTAGE_INDP_GEN_2_3_HL ||
+ (supports_time(margining) &&
+ independent_time_margins(margining) == USB4_MARGIN_CAP_TIME_INDP_GEN_2_3_LR))
+ debugfs_create_file("margin", 0600, dir, margining, &margining_margin_fops);
+
+ margining->error_counter = USB4_MARGIN_SW_ERROR_COUNTER_CLEAR;
+ margining->dwell_time = MIN_DWELL_TIME;
+
+ if (supports_optional_voltage_offset_range(margining))
+ debugfs_create_file("optional_voltage_offset", DEBUGFS_MODE, dir, margining,
+ &margining_optional_voltage_offset_fops);
+
+ if (supports_software(margining)) {
+ debugfs_create_file("voltage_time_offset", DEBUGFS_MODE, dir, margining,
+ &margining_voltage_time_offset_fops);
+ debugfs_create_file("error_counter", DEBUGFS_MODE, dir, margining,
+ &margining_error_counter_fops);
+ debugfs_create_file("dwell_time", DEBUGFS_MODE, dir, margining,
+ &margining_dwell_time_fops);
+ }
+
+ if (margining->gen >= 4)
+ debugfs_create_file("eye", 0600, dir, port, &margining_eye_fops);
+
+ return margining;
+}
+
+static void margining_port_init(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);
+ port->usb4->margining = margining_alloc(port, &port->usb4->dev,
+ USB4_SB_TARGET_ROUTER, 0,
+ parent);
}
static void margining_port_remove(struct tb_port *port)
@@ -1019,11 +1843,27 @@ static void margining_xdomain_remove(struct tb_xdomain *xd)
downstream = tb_port_at(xd->route, parent_sw);
margining_port_remove(downstream);
}
+
+static void margining_retimer_init(struct tb_retimer *rt, struct dentry *debugfs_dir)
+{
+ rt->margining = margining_alloc(rt->port, &rt->dev,
+ USB4_SB_TARGET_RETIMER, rt->index,
+ debugfs_dir);
+}
+
+static void margining_retimer_remove(struct tb_retimer *rt)
+{
+ kfree(rt->margining);
+ rt->margining = NULL;
+}
#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) { }
+static inline void margining_retimer_init(struct tb_retimer *rt,
+ struct dentry *debugfs_dir) { }
+static inline void margining_retimer_remove(struct tb_retimer *rt) { }
#endif
static int port_clear_all_counters(struct tb_port *port)
@@ -1346,7 +2186,7 @@ static int switch_basic_regs_show(struct tb_switch *sw, struct seq_file *s)
if (tb_switch_is_usb4(sw))
dwords = ARRAY_SIZE(data);
else
- dwords = 7;
+ dwords = 5;
ret = tb_sw_read(sw, data, TB_CFG_SWITCH, 0, dwords);
if (ret)
@@ -1448,7 +2288,7 @@ out_rpm_put:
return ret;
}
-DEBUGFS_ATTR_RO(path);
+DEBUGFS_ATTR_RW(path);
static int counter_set_regs_show(struct tb_port *port, struct seq_file *s,
int counter)
@@ -1504,6 +2344,60 @@ out:
}
DEBUGFS_ATTR_RW(counters);
+static int sb_regs_show(struct tb_port *port, const struct sb_reg *sb_regs,
+ size_t size, enum usb4_sb_target target, u8 index,
+ struct seq_file *s)
+{
+ int ret, i;
+
+ seq_puts(s, "# register value\n");
+
+ for (i = 0; i < size; i++) {
+ const struct sb_reg *regs = &sb_regs[i];
+ u8 data[64];
+ int j;
+
+ memset(data, 0, sizeof(data));
+ ret = usb4_port_sb_read(port, target, index, regs->reg, data,
+ regs->size);
+ if (ret)
+ return ret;
+
+ seq_printf(s, "0x%02x", regs->reg);
+ for (j = 0; j < regs->size; j++)
+ seq_printf(s, " 0x%02x", data[j]);
+ seq_puts(s, "\n");
+ }
+
+ return 0;
+}
+
+static int port_sb_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;
+ }
+
+ ret = sb_regs_show(port, port_sb_regs, ARRAY_SIZE(port_sb_regs),
+ USB4_SB_TARGET_ROUTER, 0, s);
+
+ 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_sb_regs);
+
/**
* tb_switch_debugfs_init() - Add debugfs entries for router
* @sw: Pointer to the router
@@ -1519,6 +2413,8 @@ void tb_switch_debugfs_init(struct tb_switch *sw)
sw->debugfs_dir = debugfs_dir;
debugfs_create_file("regs", DEBUGFS_MODE, debugfs_dir, sw,
&switch_regs_fops);
+ if (sw->drom)
+ debugfs_create_blob("drom", 0400, debugfs_dir, &sw->drom_blob);
tb_switch_for_each_port(sw, port) {
struct dentry *debugfs_dir;
@@ -1538,6 +2434,9 @@ void tb_switch_debugfs_init(struct tb_switch *sw)
if (port->config.counters_support)
debugfs_create_file("counters", 0600, debugfs_dir, port,
&counters_fops);
+ if (port->usb4)
+ debugfs_create_file("sb_regs", DEBUGFS_MODE, debugfs_dir,
+ port, &port_sb_regs_fops);
}
margining_switch_init(sw);
@@ -1589,6 +2488,59 @@ void tb_service_debugfs_remove(struct tb_service *svc)
svc->debugfs_dir = NULL;
}
+static int retimer_sb_regs_show(struct seq_file *s, void *not_used)
+{
+ struct tb_retimer *rt = s->private;
+ struct tb *tb = rt->tb;
+ int ret;
+
+ pm_runtime_get_sync(&rt->dev);
+
+ if (mutex_lock_interruptible(&tb->lock)) {
+ ret = -ERESTARTSYS;
+ goto out_rpm_put;
+ }
+
+ ret = sb_regs_show(rt->port, retimer_sb_regs, ARRAY_SIZE(retimer_sb_regs),
+ USB4_SB_TARGET_RETIMER, rt->index, s);
+
+ mutex_unlock(&tb->lock);
+out_rpm_put:
+ pm_runtime_mark_last_busy(&rt->dev);
+ pm_runtime_put_autosuspend(&rt->dev);
+
+ return ret;
+}
+DEBUGFS_ATTR_RW(retimer_sb_regs);
+
+/**
+ * tb_retimer_debugfs_init() - Add debugfs directory for retimer
+ * @rt: Pointer to retimer structure
+ *
+ * Adds and populates retimer debugfs directory.
+ */
+void tb_retimer_debugfs_init(struct tb_retimer *rt)
+{
+ struct dentry *debugfs_dir;
+
+ debugfs_dir = debugfs_create_dir(dev_name(&rt->dev), tb_debugfs_root);
+ debugfs_create_file("sb_regs", DEBUGFS_MODE, debugfs_dir, rt,
+ &retimer_sb_regs_fops);
+ margining_retimer_init(rt, debugfs_dir);
+}
+
+/**
+ * tb_retimer_debugfs_remove() - Remove retimer debugfs directory
+ * @rt: Pointer to retimer structure
+ *
+ * Removes the retimer debugfs directory along with its contents.
+ */
+void tb_retimer_debugfs_remove(struct tb_retimer *rt)
+{
+ debugfs_lookup_and_remove(dev_name(&rt->dev), tb_debugfs_root);
+ margining_retimer_remove(rt);
+}
+
void tb_debugfs_init(void)
{
tb_debugfs_root = debugfs_create_dir("thunderbolt", NULL);
generated by cgit (git 2.34.1) at 2025-07-10 09:02:56 +0000