// SPDX-License-Identifier: GPL-2.0 /* * Debugfs interface * * Copyright (C) 2020, Intel Corporation * Authors: Gil Fine * Mika Westerberg */ #include #include #include #include #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 /* 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) \ { \ 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); } 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, ®, 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_rpm_put; } 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_rpm_put: pm_runtime_mark_last_busy(&sw->dev); pm_runtime_put_autosuspend(&sw->dev); 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_rpm_put; } 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_rpm_put: pm_runtime_mark_last_busy(&rt->dev); pm_runtime_put_autosuspend(&rt->dev); return ret < 0 ? ret : count; } #define DEBUGFS_MODE 0600 #else #define port_regs_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) * @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 { struct tb_port *port; enum usb4_sb_target target; u8 index; struct device *dev; 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 tb_margining *margining) { return margining->caps[0] & USB4_MARGIN_CAP_0_MODES_SW; } static bool supports_hardware(const struct tb_margining *margining) { return margining->caps[0] & USB4_MARGIN_CAP_0_MODES_HW; } static bool both_lanes(const struct tb_margining *margining) { return margining->caps[0] & USB4_MARGIN_CAP_0_2_LANES; } static unsigned int independent_voltage_margins(const struct tb_margining *margining) { return FIELD_GET(USB4_MARGIN_CAP_0_VOLTAGE_INDP_MASK, margining->caps[0]); } static bool supports_time(const struct tb_margining *margining) { return margining->caps[0] & USB4_MARGIN_CAP_0_TIME; } /* Only applicable if supports_time() returns true */ static unsigned int independent_time_margins(const struct tb_margining *margining) { return FIELD_GET(USB4_MARGIN_CAP_1_TIME_INDP_MASK, margining->caps[1]); } 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_margining *margining = s->private; struct tb *tb = margining->port->sw->tb; unsigned int val; int ret = 0; char *buf; if (mutex_lock_interruptible(&tb->lock)) return -ERESTARTSYS; if (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 < margining->min_ber_level || val > margining->max_ber_level) { ret = -EINVAL; goto out_free; } 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) { const struct tb_margining *margining = s->private; if (margining->software) return -EINVAL; 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_margining *margining = s->private; struct tb *tb = margining->port->sw->tb; u32 cap0, cap1; if (mutex_lock_interruptible(&tb->lock)) return -ERESTARTSYS; /* Dump the raw caps first */ cap0 = margining->caps[0]; seq_printf(s, "0x%08x\n", cap0); cap1 = margining->caps[1]; seq_printf(s, "0x%08x\n", cap1); seq_printf(s, "# software margining: %s\n", 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, margining->min_ber_level); seq_puts(s, "# maximum BER level contour: "); 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(margining) ? "yes" : "no"); seq_printf(s, "# voltage margin steps: %u\n", margining->voltage_steps); seq_printf(s, "# maximum voltage offset: %u mV\n", margining->max_voltage_offset); switch (independent_voltage_margins(margining)) { 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(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"); switch (independent_time_margins(margining)) { 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", margining->time_steps); seq_printf(s, "# maximum time offset: %u mUI\n", 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_margining *margining = s->private; struct tb *tb = margining->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")) { margining->lanes = 0; } else if (!strcmp(buf, "1")) { margining->lanes = 1; } else if (!strcmp(buf, "all")) { /* Needs to be supported */ if (both_lanes(margining)) 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_margining *margining = s->private; struct tb *tb = margining->port->sw->tb; unsigned int lanes; if (mutex_lock_interruptible(&tb->lock)) return -ERESTARTSYS; lanes = margining->lanes; if (both_lanes(margining)) { 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_margining *margining = s->private; struct tb *tb = margining->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(margining)) margining->software = true; else ret = -EINVAL; } else if (!strcmp(buf, "hardware")) { if (supports_hardware(margining)) 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) { 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(margining)) { if (margining->software) seq_puts(s, "[software]"); else seq_puts(s, "software"); space = " "; } if (supports_hardware(margining)) { if (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_margining *margining = data; struct tb_port *port = margining->port; struct device *dev = margining->dev; struct tb_switch *sw = port->sw; struct tb_switch *down_sw; struct tb *tb = sw->tb; int ret, clx; if (val != 1) return -EINVAL; pm_runtime_get_sync(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; } if (margining->software) { tb_port_dbg(port, "running software %s lane margining for %s lanes %u\n", margining->time ? "time" : "voltage", dev_name(dev), margining->lanes); ret = usb4_port_sw_margin(port, margining->target, margining->index, 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->target, margining->index, &margining->results[0]); } else { tb_port_dbg(port, "running hardware %s lane margining for %s lanes %u\n", margining->time ? "time" : "voltage", dev_name(dev), margining->lanes); /* Clear the results */ margining->results[0] = 0; margining->results[1] = 0; ret = usb4_port_hw_margin(port, margining->target, margining->index, 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(dev); pm_runtime_put_autosuspend(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_margining *margining = s->private; struct tb *tb = margining->port->sw->tb; if (mutex_lock_interruptible(&tb->lock)) return -ERESTARTSYS; /* Just clear the results */ margining->results[0] = 0; 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 = FIELD_GET(USB4_MARGIN_HW_RES_1_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) 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 = FIELD_GET(USB4_MARGIN_HW_RES_1_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) seq_puts(s, " exceeds maximum"); seq_puts(s, "\n"); } static int margining_results_show(struct seq_file *s, void *not_used) { struct tb_margining *margining = s->private; struct tb *tb = margining->port->sw->tb; if (mutex_lock_interruptible(&tb->lock)) return -ERESTARTSYS; /* 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_margining *margining = s->private; struct tb *tb = margining->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(margining)) margining->time = true; else if (!strcmp(buf, "voltage")) 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_margining *margining = s->private; struct tb *tb = margining->port->sw->tb; if (mutex_lock_interruptible(&tb->lock)) return -ERESTARTSYS; if (supports_time(margining)) { if (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_margining *margining = s->private; struct tb *tb = margining->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 (margining->time) { if (!strcmp(buf, "left")) margining->right_high = false; else if (!strcmp(buf, "right")) margining->right_high = true; else ret = -EINVAL; } else { if (!strcmp(buf, "low")) margining->right_high = false; else if (!strcmp(buf, "high")) 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_margining *margining = s->private; struct tb *tb = margining->port->sw->tb; if (mutex_lock_interruptible(&tb->lock)) return -ERESTARTSYS; if (margining->time) { if (margining->right_high) seq_puts(s, "left [right]\n"); else seq_puts(s, "[left] right\n"); } else { if (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 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; unsigned int val; int ret; margining = kzalloc(sizeof(*margining), GFP_KERNEL); if (!margining) return NULL; margining->port = port; margining->target = target; margining->index = index; margining->dev = dev; ret = usb4_port_margining_caps(port, target, index, margining->caps); if (ret) { kfree(margining); return NULL; } /* Set the initial mode */ if (supports_software(margining)) margining->software = true; 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; if (supports_time(margining)) { val = FIELD_GET(USB4_MARGIN_CAP_1_TIME_STEPS_MASK, margining->caps[1]); margining->time_steps = val; 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. */ margining->max_time_offset = 200 + 10 * val; } dir = debugfs_create_dir("margining", parent); if (supports_hardware(margining)) { val = FIELD_GET(USB4_MARGIN_CAP_1_MIN_BER_MASK, margining->caps[1]); margining->min_ber_level = val; 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, margining, &margining_ber_level_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_0_VOLTAGE_HL || (supports_time(margining) && independent_time_margins(margining) == USB4_MARGIN_CAP_1_TIME_LR)) debugfs_create_file("margin", 0600, dir, margining, &margining_margin_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) { 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); } 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) { 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 \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 \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 \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 \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 \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 \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 \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 \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 = 5; 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 \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 \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); 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 * * 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); if (port->usb4) debugfs_create_file("sb_regs", DEBUGFS_MODE, debugfs_dir, port, &port_sb_regs_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; } 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); } void tb_debugfs_exit(void) { debugfs_remove_recursive(tb_debugfs_root); }