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path: root/drivers/thunderbolt/debugfs.c
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Diffstat (limited to 'drivers/thunderbolt/debugfs.c')
-rw-r--r--drivers/thunderbolt/debugfs.c701
1 files changed, 701 insertions, 0 deletions
diff --git a/drivers/thunderbolt/debugfs.c b/drivers/thunderbolt/debugfs.c
new file mode 100644
index 000000000000..3680b2784ea1
--- /dev/null
+++ b/drivers/thunderbolt/debugfs.c
@@ -0,0 +1,701 @@
+// 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 "tb.h"
+
+#define PORT_CAP_PCIE_LEN 1
+#define PORT_CAP_POWER_LEN 2
+#define PORT_CAP_LANE_LEN 3
+#define PORT_CAP_USB3_LEN 5
+#define PORT_CAP_DP_LEN 8
+#define PORT_CAP_TMU_LEN 8
+#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
+
+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(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) {
+ seq_printf(s, "0x%04x <not accessible>\n",
+ cap + offset);
+ if (dwords > 1)
+ seq_printf(s, "0x%04x ...\n", cap + offset + 1);
+ 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:
+ length = PORT_CAP_TMU_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)) {
+ length = PORT_CAP_PCIE_LEN;
+ } else if (tb_port_is_dpin(port) || tb_port_is_dpout(port)) {
+ length = PORT_CAP_DP_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;
+ /*
+ * Ice Lake and Tiger Lake do not implement the
+ * full length of the capability, only first 32
+ * dwords so hard-code it here.
+ */
+ if (!vsec_id &&
+ (tb_switch_is_ice_lake(port->sw) ||
+ tb_switch_is_tiger_lake(port->sw)))
+ length = 32;
+ }
+ 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);
+ }
+}
+
+/**
+ * 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)
+{
+ debugfs_remove_recursive(sw->debugfs_dir);
+}
+
+void tb_debugfs_init(void)
+{
+ tb_debugfs_root = debugfs_create_dir("thunderbolt", NULL);
+}
+
+void tb_debugfs_exit(void)
+{
+ debugfs_remove_recursive(tb_debugfs_root);
+}
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-03 20:32:23 +0300