// SPDX-License-Identifier: GPL-2.0 /* * Debugfs interface * * Copyright (C) 2020, Intel Corporation * Authors: Gil Fine <[email protected]> * Mika Westerberg <[email protected]> */ #include <linux/bitfield.h> #include <linux/debugfs.h> #include <linux/pm_runtime.h> #include <linux/uaccess.h> #include "tb.h" #include "sb_regs.h" #define PORT_CAP_V1_PCIE_LEN … #define PORT_CAP_V2_PCIE_LEN … #define PORT_CAP_POWER_LEN … #define PORT_CAP_LANE_LEN … #define PORT_CAP_USB3_LEN … #define PORT_CAP_DP_V1_LEN … #define PORT_CAP_DP_V2_LEN … #define PORT_CAP_TMU_V1_LEN … #define PORT_CAP_TMU_V2_LEN … #define PORT_CAP_BASIC_LEN … #define PORT_CAP_USB4_LEN … #define SWITCH_CAP_TMU_LEN … #define SWITCH_CAP_BASIC_LEN … #define PATH_LEN … #define COUNTER_SET_LEN … /* Sideband registers and their sizes as defined in the USB4 spec */ struct sb_reg { … }; #define SB_MAX_SIZE … /* Sideband registers for router */ static const struct sb_reg port_sb_regs[] = …; /* Sideband registers for retimer */ static const struct sb_reg retimer_sb_regs[] = …; #define DEBUGFS_ATTR(__space, __write) … #define DEBUGFS_ATTR_RO(__space) … #define DEBUGFS_ATTR_RW(__space) … static struct dentry *tb_debugfs_root; static void *validate_and_copy_from_user(const void __user *user_buf, size_t *count) { … } static bool parse_line(char **line, u32 *offs, u32 *val, int short_fmt_len, int long_fmt_len) { … } #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) { … } static ssize_t port_regs_write(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos) { … } static ssize_t switch_regs_write(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos) { … } static bool parse_sb_line(char **line, u8 *reg, u8 *data, size_t data_size, size_t *bytes_read) { … } 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) { … } static ssize_t port_sb_regs_write(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos) { … } static ssize_t retimer_sb_regs_write(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos) { … } #define DEBUGFS_MODE … #else #define port_regs_write … #define switch_regs_write … #define port_sb_regs_write … #define retimer_sb_regs_write … #define DEBUGFS_MODE … #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 { … }; static bool supports_software(const struct tb_margining *margining) { … } static bool supports_hardware(const struct tb_margining *margining) { … } static bool both_lanes(const struct tb_margining *margining) { … } static unsigned int independent_voltage_margins(const struct tb_margining *margining) { … } static bool supports_time(const struct tb_margining *margining) { … } /* Only applicable if supports_time() returns true */ static unsigned int independent_time_margins(const struct tb_margining *margining) { … } static ssize_t margining_ber_level_write(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos) { … } 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) { … } DEBUGFS_ATTR_RW(…); static int margining_caps_show(struct seq_file *s, void *not_used) { … } DEBUGFS_ATTR_RO(…); static ssize_t margining_lanes_write(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos) { … } static int margining_lanes_show(struct seq_file *s, void *not_used) { … } DEBUGFS_ATTR_RW(…); static ssize_t margining_mode_write(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos) { … } static int margining_mode_show(struct seq_file *s, void *not_used) { … } DEBUGFS_ATTR_RW(…); static int margining_run_write(void *data, u64 val) { … } DEFINE_DEBUGFS_ATTRIBUTE(…); static ssize_t margining_results_write(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos) { … } static void voltage_margin_show(struct seq_file *s, const struct tb_margining *margining, u8 val) { … } static void time_margin_show(struct seq_file *s, const struct tb_margining *margining, u8 val) { … } static int margining_results_show(struct seq_file *s, void *not_used) { … } DEBUGFS_ATTR_RW(…); static ssize_t margining_test_write(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos) { … } static int margining_test_show(struct seq_file *s, void *not_used) { … } DEBUGFS_ATTR_RW(…); static ssize_t margining_margin_write(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos) { … } static int margining_margin_show(struct seq_file *s, void *not_used) { … } DEBUGFS_ATTR_RW(…); static struct tb_margining *margining_alloc(struct tb_port *port, struct device *dev, enum usb4_sb_target target, u8 index, struct dentry *parent) { … } static void margining_port_init(struct tb_port *port) { … } static void margining_port_remove(struct tb_port *port) { … } static void margining_switch_init(struct tb_switch *sw) { … } static void margining_switch_remove(struct tb_switch *sw) { … } static void margining_xdomain_init(struct tb_xdomain *xd) { … } static void margining_xdomain_remove(struct tb_xdomain *xd) { … } static void margining_retimer_init(struct tb_retimer *rt, struct dentry *debugfs_dir) { … } static void margining_retimer_remove(struct tb_retimer *rt) { … } #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) { … } static ssize_t counters_write(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos) { … } 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) { … } 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) { … } static void port_cap_show(struct tb_port *port, struct seq_file *s, unsigned int cap) { … } static void port_caps_show(struct tb_port *port, struct seq_file *s) { … } static int port_basic_regs_show(struct tb_port *port, struct seq_file *s) { … } static int port_regs_show(struct seq_file *s, void *not_used) { … } DEBUGFS_ATTR_RW(…); static void switch_cap_show(struct tb_switch *sw, struct seq_file *s, unsigned int cap) { … } static void switch_caps_show(struct tb_switch *sw, struct seq_file *s) { … } static int switch_basic_regs_show(struct tb_switch *sw, struct seq_file *s) { … } static int switch_regs_show(struct seq_file *s, void *not_used) { … } DEBUGFS_ATTR_RW(…); static int path_show_one(struct tb_port *port, struct seq_file *s, int hopid) { … } static int path_show(struct seq_file *s, void *not_used) { … } DEBUGFS_ATTR_RO(…); static int counter_set_regs_show(struct tb_port *port, struct seq_file *s, int counter) { … } static int counters_show(struct seq_file *s, void *not_used) { … } DEBUGFS_ATTR_RW(…); 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) { … } static int port_sb_regs_show(struct seq_file *s, void *not_used) { … } DEBUGFS_ATTR_RW(…); /** * 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) { … } /** * 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) { … } void tb_xdomain_debugfs_init(struct tb_xdomain *xd) { … } void tb_xdomain_debugfs_remove(struct tb_xdomain *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) { … } /** * 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) { … } static int retimer_sb_regs_show(struct seq_file *s, void *not_used) { … } DEBUGFS_ATTR_RW(…); /** * 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) { … } /** * 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) { … } void tb_debugfs_init(void) { … } void tb_debugfs_exit(void) { … }
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