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737 lines
16 KiB
737 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Debugfs interface |
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* |
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* Copyright (C) 2020, Intel Corporation |
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* Authors: Gil Fine <[email protected]> |
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* Mika Westerberg <[email protected]> |
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*/ |
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|
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#include <linux/debugfs.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/uaccess.h> |
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|
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#include "tb.h" |
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#define PORT_CAP_PCIE_LEN 1 |
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#define PORT_CAP_POWER_LEN 2 |
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#define PORT_CAP_LANE_LEN 3 |
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#define PORT_CAP_USB3_LEN 5 |
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#define PORT_CAP_DP_LEN 8 |
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#define PORT_CAP_TMU_LEN 8 |
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#define PORT_CAP_BASIC_LEN 9 |
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#define PORT_CAP_USB4_LEN 20 |
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#define SWITCH_CAP_TMU_LEN 26 |
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#define SWITCH_CAP_BASIC_LEN 27 |
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#define PATH_LEN 2 |
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#define COUNTER_SET_LEN 3 |
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#define DEBUGFS_ATTR(__space, __write) \ |
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static int __space ## _open(struct inode *inode, struct file *file) \ |
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{ \ |
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return single_open(file, __space ## _show, inode->i_private); \ |
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} \ |
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\ |
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static const struct file_operations __space ## _fops = { \ |
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.owner = THIS_MODULE, \ |
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.open = __space ## _open, \ |
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.release = single_release, \ |
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.read = seq_read, \ |
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.write = __write, \ |
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.llseek = seq_lseek, \ |
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} |
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#define DEBUGFS_ATTR_RO(__space) \ |
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DEBUGFS_ATTR(__space, NULL) |
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#define DEBUGFS_ATTR_RW(__space) \ |
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DEBUGFS_ATTR(__space, __space ## _write) |
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static struct dentry *tb_debugfs_root; |
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static void *validate_and_copy_from_user(const void __user *user_buf, |
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size_t *count) |
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{ |
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size_t nbytes; |
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void *buf; |
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if (!*count) |
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return ERR_PTR(-EINVAL); |
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if (!access_ok(user_buf, *count)) |
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return ERR_PTR(-EFAULT); |
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buf = (void *)get_zeroed_page(GFP_KERNEL); |
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if (!buf) |
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return ERR_PTR(-ENOMEM); |
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nbytes = min_t(size_t, *count, PAGE_SIZE); |
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if (copy_from_user(buf, user_buf, nbytes)) { |
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free_page((unsigned long)buf); |
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return ERR_PTR(-EFAULT); |
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} |
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*count = nbytes; |
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return buf; |
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} |
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static bool parse_line(char **line, u32 *offs, u32 *val, int short_fmt_len, |
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int long_fmt_len) |
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{ |
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char *token; |
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u32 v[5]; |
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int ret; |
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token = strsep(line, "\n"); |
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if (!token) |
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return false; |
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/* |
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* For Adapter/Router configuration space: |
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* Short format is: offset value\n |
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* v[0] v[1] |
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* Long format as produced from the read side: |
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* offset relative_offset cap_id vs_cap_id value\n |
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* v[0] v[1] v[2] v[3] v[4] |
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* |
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* For Counter configuration space: |
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* Short format is: offset\n |
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* v[0] |
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* Long format as produced from the read side: |
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* offset relative_offset counter_id value\n |
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* v[0] v[1] v[2] v[3] |
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*/ |
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ret = sscanf(token, "%i %i %i %i %i", &v[0], &v[1], &v[2], &v[3], &v[4]); |
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/* In case of Counters, clear counter, "val" content is NA */ |
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if (ret == short_fmt_len) { |
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*offs = v[0]; |
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*val = v[short_fmt_len - 1]; |
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return true; |
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} else if (ret == long_fmt_len) { |
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*offs = v[0]; |
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*val = v[long_fmt_len - 1]; |
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return true; |
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} |
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return false; |
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} |
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#if IS_ENABLED(CONFIG_USB4_DEBUGFS_WRITE) |
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static ssize_t regs_write(struct tb_switch *sw, struct tb_port *port, |
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const char __user *user_buf, size_t count, |
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loff_t *ppos) |
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{ |
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struct tb *tb = sw->tb; |
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char *line, *buf; |
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u32 val, offset; |
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int ret = 0; |
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buf = validate_and_copy_from_user(user_buf, &count); |
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if (IS_ERR(buf)) |
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return PTR_ERR(buf); |
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pm_runtime_get_sync(&sw->dev); |
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if (mutex_lock_interruptible(&tb->lock)) { |
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ret = -ERESTARTSYS; |
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goto out; |
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} |
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/* User did hardware changes behind the driver's back */ |
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add_taint(TAINT_USER, LOCKDEP_STILL_OK); |
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line = buf; |
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while (parse_line(&line, &offset, &val, 2, 5)) { |
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if (port) |
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ret = tb_port_write(port, &val, TB_CFG_PORT, offset, 1); |
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else |
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ret = tb_sw_write(sw, &val, TB_CFG_SWITCH, offset, 1); |
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if (ret) |
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break; |
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} |
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mutex_unlock(&tb->lock); |
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out: |
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pm_runtime_mark_last_busy(&sw->dev); |
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pm_runtime_put_autosuspend(&sw->dev); |
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free_page((unsigned long)buf); |
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return ret < 0 ? ret : count; |
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} |
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static ssize_t port_regs_write(struct file *file, const char __user *user_buf, |
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size_t count, loff_t *ppos) |
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{ |
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struct seq_file *s = file->private_data; |
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struct tb_port *port = s->private; |
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return regs_write(port->sw, port, user_buf, count, ppos); |
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} |
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static ssize_t switch_regs_write(struct file *file, const char __user *user_buf, |
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size_t count, loff_t *ppos) |
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{ |
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struct seq_file *s = file->private_data; |
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struct tb_switch *sw = s->private; |
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return regs_write(sw, NULL, user_buf, count, ppos); |
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} |
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#define DEBUGFS_MODE 0600 |
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#else |
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#define port_regs_write NULL |
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#define switch_regs_write NULL |
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#define DEBUGFS_MODE 0400 |
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#endif |
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static int port_clear_all_counters(struct tb_port *port) |
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{ |
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u32 *buf; |
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int ret; |
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buf = kcalloc(COUNTER_SET_LEN * port->config.max_counters, sizeof(u32), |
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GFP_KERNEL); |
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if (!buf) |
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return -ENOMEM; |
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ret = tb_port_write(port, buf, TB_CFG_COUNTERS, 0, |
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COUNTER_SET_LEN * port->config.max_counters); |
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kfree(buf); |
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return ret; |
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} |
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static ssize_t counters_write(struct file *file, const char __user *user_buf, |
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size_t count, loff_t *ppos) |
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{ |
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struct seq_file *s = file->private_data; |
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struct tb_port *port = s->private; |
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struct tb_switch *sw = port->sw; |
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struct tb *tb = port->sw->tb; |
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char *buf; |
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int ret; |
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buf = validate_and_copy_from_user(user_buf, &count); |
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if (IS_ERR(buf)) |
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return PTR_ERR(buf); |
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pm_runtime_get_sync(&sw->dev); |
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if (mutex_lock_interruptible(&tb->lock)) { |
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ret = -ERESTARTSYS; |
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goto out; |
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} |
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/* If written delimiter only, clear all counters in one shot */ |
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if (buf[0] == '\n') { |
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ret = port_clear_all_counters(port); |
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} else { |
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char *line = buf; |
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u32 val, offset; |
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ret = -EINVAL; |
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while (parse_line(&line, &offset, &val, 1, 4)) { |
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ret = tb_port_write(port, &val, TB_CFG_COUNTERS, |
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offset, 1); |
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if (ret) |
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break; |
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} |
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} |
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mutex_unlock(&tb->lock); |
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out: |
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pm_runtime_mark_last_busy(&sw->dev); |
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pm_runtime_put_autosuspend(&sw->dev); |
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free_page((unsigned long)buf); |
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return ret < 0 ? ret : count; |
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} |
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static void cap_show_by_dw(struct seq_file *s, struct tb_switch *sw, |
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struct tb_port *port, unsigned int cap, |
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unsigned int offset, u8 cap_id, u8 vsec_id, |
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int dwords) |
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{ |
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int i, ret; |
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u32 data; |
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for (i = 0; i < dwords; i++) { |
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if (port) |
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ret = tb_port_read(port, &data, TB_CFG_PORT, cap + offset + i, 1); |
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else |
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ret = tb_sw_read(sw, &data, TB_CFG_SWITCH, cap + offset + i, 1); |
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if (ret) { |
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seq_printf(s, "0x%04x <not accessible>\n", cap + offset + i); |
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continue; |
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} |
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seq_printf(s, "0x%04x %4d 0x%02x 0x%02x 0x%08x\n", cap + offset + i, |
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offset + i, cap_id, vsec_id, data); |
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} |
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} |
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static void cap_show(struct seq_file *s, struct tb_switch *sw, |
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struct tb_port *port, unsigned int cap, u8 cap_id, |
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u8 vsec_id, int length) |
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{ |
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int ret, offset = 0; |
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while (length > 0) { |
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int i, dwords = min(length, TB_MAX_CONFIG_RW_LENGTH); |
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u32 data[TB_MAX_CONFIG_RW_LENGTH]; |
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if (port) |
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ret = tb_port_read(port, data, TB_CFG_PORT, cap + offset, |
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dwords); |
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else |
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ret = tb_sw_read(sw, data, TB_CFG_SWITCH, cap + offset, dwords); |
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if (ret) { |
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cap_show_by_dw(s, sw, port, cap, offset, cap_id, vsec_id, length); |
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return; |
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} |
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for (i = 0; i < dwords; i++) { |
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seq_printf(s, "0x%04x %4d 0x%02x 0x%02x 0x%08x\n", |
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cap + offset + i, offset + i, |
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cap_id, vsec_id, data[i]); |
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} |
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length -= dwords; |
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offset += dwords; |
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} |
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} |
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static void port_cap_show(struct tb_port *port, struct seq_file *s, |
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unsigned int cap) |
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{ |
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struct tb_cap_any header; |
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u8 vsec_id = 0; |
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size_t length; |
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int ret; |
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ret = tb_port_read(port, &header, TB_CFG_PORT, cap, 1); |
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if (ret) { |
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seq_printf(s, "0x%04x <capability read failed>\n", cap); |
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return; |
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} |
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switch (header.basic.cap) { |
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case TB_PORT_CAP_PHY: |
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length = PORT_CAP_LANE_LEN; |
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break; |
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case TB_PORT_CAP_TIME1: |
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length = PORT_CAP_TMU_LEN; |
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break; |
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case TB_PORT_CAP_POWER: |
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length = PORT_CAP_POWER_LEN; |
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break; |
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case TB_PORT_CAP_ADAP: |
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if (tb_port_is_pcie_down(port) || tb_port_is_pcie_up(port)) { |
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length = PORT_CAP_PCIE_LEN; |
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} else if (tb_port_is_dpin(port) || tb_port_is_dpout(port)) { |
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length = PORT_CAP_DP_LEN; |
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} else if (tb_port_is_usb3_down(port) || |
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tb_port_is_usb3_up(port)) { |
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length = PORT_CAP_USB3_LEN; |
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} else { |
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seq_printf(s, "0x%04x <unsupported capability 0x%02x>\n", |
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cap, header.basic.cap); |
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return; |
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} |
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break; |
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case TB_PORT_CAP_VSE: |
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if (!header.extended_short.length) { |
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ret = tb_port_read(port, (u32 *)&header + 1, TB_CFG_PORT, |
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cap + 1, 1); |
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if (ret) { |
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seq_printf(s, "0x%04x <capability read failed>\n", |
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cap + 1); |
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return; |
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} |
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length = header.extended_long.length; |
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vsec_id = header.extended_short.vsec_id; |
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} else { |
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length = header.extended_short.length; |
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vsec_id = header.extended_short.vsec_id; |
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} |
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break; |
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case TB_PORT_CAP_USB4: |
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length = PORT_CAP_USB4_LEN; |
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break; |
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default: |
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seq_printf(s, "0x%04x <unsupported capability 0x%02x>\n", |
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cap, header.basic.cap); |
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return; |
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} |
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cap_show(s, NULL, port, cap, header.basic.cap, vsec_id, length); |
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} |
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static void port_caps_show(struct tb_port *port, struct seq_file *s) |
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{ |
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int cap; |
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cap = tb_port_next_cap(port, 0); |
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while (cap > 0) { |
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port_cap_show(port, s, cap); |
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cap = tb_port_next_cap(port, cap); |
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} |
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} |
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static int port_basic_regs_show(struct tb_port *port, struct seq_file *s) |
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{ |
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u32 data[PORT_CAP_BASIC_LEN]; |
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int ret, i; |
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ret = tb_port_read(port, data, TB_CFG_PORT, 0, ARRAY_SIZE(data)); |
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if (ret) |
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return ret; |
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for (i = 0; i < ARRAY_SIZE(data); i++) |
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seq_printf(s, "0x%04x %4d 0x00 0x00 0x%08x\n", i, i, data[i]); |
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return 0; |
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} |
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static int port_regs_show(struct seq_file *s, void *not_used) |
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{ |
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struct tb_port *port = s->private; |
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struct tb_switch *sw = port->sw; |
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struct tb *tb = sw->tb; |
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int ret; |
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pm_runtime_get_sync(&sw->dev); |
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if (mutex_lock_interruptible(&tb->lock)) { |
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ret = -ERESTARTSYS; |
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goto out_rpm_put; |
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} |
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seq_puts(s, "# offset relative_offset cap_id vs_cap_id value\n"); |
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ret = port_basic_regs_show(port, s); |
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if (ret) |
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goto out_unlock; |
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port_caps_show(port, s); |
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out_unlock: |
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mutex_unlock(&tb->lock); |
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out_rpm_put: |
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pm_runtime_mark_last_busy(&sw->dev); |
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pm_runtime_put_autosuspend(&sw->dev); |
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return ret; |
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} |
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DEBUGFS_ATTR_RW(port_regs); |
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static void switch_cap_show(struct tb_switch *sw, struct seq_file *s, |
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unsigned int cap) |
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{ |
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struct tb_cap_any header; |
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int ret, length; |
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u8 vsec_id = 0; |
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ret = tb_sw_read(sw, &header, TB_CFG_SWITCH, cap, 1); |
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if (ret) { |
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seq_printf(s, "0x%04x <capability read failed>\n", cap); |
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return; |
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} |
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if (header.basic.cap == TB_SWITCH_CAP_VSE) { |
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if (!header.extended_short.length) { |
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ret = tb_sw_read(sw, (u32 *)&header + 1, TB_CFG_SWITCH, |
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cap + 1, 1); |
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if (ret) { |
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seq_printf(s, "0x%04x <capability read failed>\n", |
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cap + 1); |
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return; |
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} |
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length = header.extended_long.length; |
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} else { |
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length = header.extended_short.length; |
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} |
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vsec_id = header.extended_short.vsec_id; |
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} else { |
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if (header.basic.cap == TB_SWITCH_CAP_TMU) { |
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length = SWITCH_CAP_TMU_LEN; |
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} else { |
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seq_printf(s, "0x%04x <unknown capability 0x%02x>\n", |
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cap, header.basic.cap); |
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return; |
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} |
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} |
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cap_show(s, sw, NULL, cap, header.basic.cap, vsec_id, length); |
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} |
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static void switch_caps_show(struct tb_switch *sw, struct seq_file *s) |
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{ |
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int cap; |
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cap = tb_switch_next_cap(sw, 0); |
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while (cap > 0) { |
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switch_cap_show(sw, s, cap); |
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cap = tb_switch_next_cap(sw, cap); |
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} |
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} |
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static int switch_basic_regs_show(struct tb_switch *sw, struct seq_file *s) |
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{ |
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u32 data[SWITCH_CAP_BASIC_LEN]; |
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size_t dwords; |
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int ret, i; |
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/* Only USB4 has the additional registers */ |
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if (tb_switch_is_usb4(sw)) |
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dwords = ARRAY_SIZE(data); |
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else |
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dwords = 7; |
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ret = tb_sw_read(sw, data, TB_CFG_SWITCH, 0, dwords); |
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if (ret) |
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return ret; |
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for (i = 0; i < dwords; i++) |
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seq_printf(s, "0x%04x %4d 0x00 0x00 0x%08x\n", i, i, data[i]); |
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return 0; |
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} |
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static int switch_regs_show(struct seq_file *s, void *not_used) |
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{ |
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struct tb_switch *sw = s->private; |
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struct tb *tb = sw->tb; |
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int ret; |
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pm_runtime_get_sync(&sw->dev); |
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if (mutex_lock_interruptible(&tb->lock)) { |
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ret = -ERESTARTSYS; |
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goto out_rpm_put; |
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} |
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seq_puts(s, "# offset relative_offset cap_id vs_cap_id value\n"); |
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ret = switch_basic_regs_show(sw, s); |
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if (ret) |
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goto out_unlock; |
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switch_caps_show(sw, s); |
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out_unlock: |
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mutex_unlock(&tb->lock); |
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out_rpm_put: |
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pm_runtime_mark_last_busy(&sw->dev); |
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pm_runtime_put_autosuspend(&sw->dev); |
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return ret; |
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} |
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DEBUGFS_ATTR_RW(switch_regs); |
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static int path_show_one(struct tb_port *port, struct seq_file *s, int hopid) |
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{ |
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u32 data[PATH_LEN]; |
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int ret, i; |
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ret = tb_port_read(port, data, TB_CFG_HOPS, hopid * PATH_LEN, |
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ARRAY_SIZE(data)); |
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if (ret) { |
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seq_printf(s, "0x%04x <not accessible>\n", hopid * PATH_LEN); |
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return ret; |
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} |
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for (i = 0; i < ARRAY_SIZE(data); i++) { |
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seq_printf(s, "0x%04x %4d 0x%02x 0x%08x\n", |
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hopid * PATH_LEN + i, i, hopid, data[i]); |
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} |
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return 0; |
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} |
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static int path_show(struct seq_file *s, void *not_used) |
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{ |
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struct tb_port *port = s->private; |
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struct tb_switch *sw = port->sw; |
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struct tb *tb = sw->tb; |
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int start, i, ret = 0; |
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|
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pm_runtime_get_sync(&sw->dev); |
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|
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if (mutex_lock_interruptible(&tb->lock)) { |
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ret = -ERESTARTSYS; |
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goto out_rpm_put; |
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} |
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seq_puts(s, "# offset relative_offset in_hop_id value\n"); |
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|
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/* NHI and lane adapters have entry for path 0 */ |
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if (tb_port_is_null(port) || tb_port_is_nhi(port)) { |
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ret = path_show_one(port, s, 0); |
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if (ret) |
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goto out_unlock; |
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} |
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start = tb_port_is_nhi(port) ? 1 : TB_PATH_MIN_HOPID; |
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|
|
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); |
|
} |
|
|
|
/** |
|
* tb_service_debugfs_init() - Add debugfs directory for service |
|
* @svc: Thunderbolt service pointer |
|
* |
|
* Adds debugfs directory for service. |
|
*/ |
|
void tb_service_debugfs_init(struct tb_service *svc) |
|
{ |
|
svc->debugfs_dir = debugfs_create_dir(dev_name(&svc->dev), |
|
tb_debugfs_root); |
|
} |
|
|
|
/** |
|
* tb_service_debugfs_remove() - Remove service debugfs directory |
|
* @svc: Thunderbolt service pointer |
|
* |
|
* Removes the previously created debugfs directory for @svc. |
|
*/ |
|
void tb_service_debugfs_remove(struct tb_service *svc) |
|
{ |
|
debugfs_remove_recursive(svc->debugfs_dir); |
|
svc->debugfs_dir = NULL; |
|
} |
|
|
|
void tb_debugfs_init(void) |
|
{ |
|
tb_debugfs_root = debugfs_create_dir("thunderbolt", NULL); |
|
} |
|
|
|
void tb_debugfs_exit(void) |
|
{ |
|
debugfs_remove_recursive(tb_debugfs_root); |
|
}
|
|
|