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d80d926c5b
This is useful when debugging possible issues. Signed-off-by: Gil Fine <gil.fine@linux.intel.com> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
567 lines
12 KiB
C
567 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Thunderbolt/USB4 retimer support.
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*
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* Copyright (C) 2020, Intel Corporation
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* Authors: Kranthi Kuntala <kranthi.kuntala@intel.com>
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* Mika Westerberg <mika.westerberg@linux.intel.com>
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*/
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#include <linux/delay.h>
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#include <linux/pm_runtime.h>
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#include <linux/sched/signal.h>
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#include "sb_regs.h"
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#include "tb.h"
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#define TB_MAX_RETIMER_INDEX 6
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/**
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* tb_retimer_nvm_read() - Read contents of retimer NVM
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* @rt: Retimer device
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* @address: NVM address (in bytes) to start reading
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* @buf: Data read from NVM is stored here
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* @size: Number of bytes to read
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*
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* Reads retimer NVM and copies the contents to @buf. Returns %0 if the
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* read was successful and negative errno in case of failure.
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*/
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int tb_retimer_nvm_read(struct tb_retimer *rt, unsigned int address, void *buf,
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size_t size)
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{
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return usb4_port_retimer_nvm_read(rt->port, rt->index, address, buf, size);
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}
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static int nvm_read(void *priv, unsigned int offset, void *val, size_t bytes)
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{
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struct tb_nvm *nvm = priv;
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struct tb_retimer *rt = tb_to_retimer(nvm->dev);
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int ret;
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pm_runtime_get_sync(&rt->dev);
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if (!mutex_trylock(&rt->tb->lock)) {
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ret = restart_syscall();
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goto out;
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}
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ret = tb_retimer_nvm_read(rt, offset, val, bytes);
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mutex_unlock(&rt->tb->lock);
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out:
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pm_runtime_mark_last_busy(&rt->dev);
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pm_runtime_put_autosuspend(&rt->dev);
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return ret;
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}
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static int nvm_write(void *priv, unsigned int offset, void *val, size_t bytes)
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{
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struct tb_nvm *nvm = priv;
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struct tb_retimer *rt = tb_to_retimer(nvm->dev);
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int ret = 0;
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if (!mutex_trylock(&rt->tb->lock))
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return restart_syscall();
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ret = tb_nvm_write_buf(nvm, offset, val, bytes);
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mutex_unlock(&rt->tb->lock);
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return ret;
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}
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static int tb_retimer_nvm_add(struct tb_retimer *rt)
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{
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struct tb_nvm *nvm;
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int ret;
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nvm = tb_nvm_alloc(&rt->dev);
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if (IS_ERR(nvm)) {
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ret = PTR_ERR(nvm) == -EOPNOTSUPP ? 0 : PTR_ERR(nvm);
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goto err_nvm;
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}
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ret = tb_nvm_read_version(nvm);
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if (ret)
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goto err_nvm;
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ret = tb_nvm_add_active(nvm, nvm_read);
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if (ret)
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goto err_nvm;
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ret = tb_nvm_add_non_active(nvm, nvm_write);
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if (ret)
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goto err_nvm;
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rt->nvm = nvm;
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dev_dbg(&rt->dev, "NVM version %x.%x\n", nvm->major, nvm->minor);
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return 0;
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err_nvm:
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dev_dbg(&rt->dev, "NVM upgrade disabled\n");
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if (!IS_ERR(nvm))
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tb_nvm_free(nvm);
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return ret;
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}
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static int tb_retimer_nvm_validate_and_write(struct tb_retimer *rt)
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{
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unsigned int image_size;
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const u8 *buf;
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int ret;
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ret = tb_nvm_validate(rt->nvm);
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if (ret)
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return ret;
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buf = rt->nvm->buf_data_start;
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image_size = rt->nvm->buf_data_size;
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ret = usb4_port_retimer_nvm_write(rt->port, rt->index, 0, buf,
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image_size);
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if (ret)
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return ret;
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rt->nvm->flushed = true;
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return 0;
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}
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static int tb_retimer_nvm_authenticate(struct tb_retimer *rt, bool auth_only)
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{
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u32 status;
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int ret;
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if (auth_only) {
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ret = usb4_port_retimer_nvm_set_offset(rt->port, rt->index, 0);
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if (ret)
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return ret;
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}
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ret = usb4_port_retimer_nvm_authenticate(rt->port, rt->index);
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if (ret)
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return ret;
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usleep_range(100, 150);
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/*
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* Check the status now if we still can access the retimer. It
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* is expected that the below fails.
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*/
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ret = usb4_port_retimer_nvm_authenticate_status(rt->port, rt->index,
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&status);
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if (!ret) {
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rt->auth_status = status;
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return status ? -EINVAL : 0;
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}
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return 0;
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}
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static ssize_t device_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct tb_retimer *rt = tb_to_retimer(dev);
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return sysfs_emit(buf, "%#x\n", rt->device);
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}
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static DEVICE_ATTR_RO(device);
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static ssize_t nvm_authenticate_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct tb_retimer *rt = tb_to_retimer(dev);
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int ret;
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if (!mutex_trylock(&rt->tb->lock))
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return restart_syscall();
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if (!rt->nvm)
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ret = -EAGAIN;
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else if (rt->no_nvm_upgrade)
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ret = -EOPNOTSUPP;
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else
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ret = sysfs_emit(buf, "%#x\n", rt->auth_status);
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mutex_unlock(&rt->tb->lock);
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return ret;
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}
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static void tb_retimer_nvm_authenticate_status(struct tb_port *port, u32 *status)
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{
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int i;
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tb_port_dbg(port, "reading NVM authentication status of retimers\n");
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/*
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* Before doing anything else, read the authentication status.
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* If the retimer has it set, store it for the new retimer
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* device instance.
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*/
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for (i = 1; i <= TB_MAX_RETIMER_INDEX; i++)
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usb4_port_retimer_nvm_authenticate_status(port, i, &status[i]);
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}
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static void tb_retimer_set_inbound_sbtx(struct tb_port *port)
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{
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int i;
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/*
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* When USB4 port is online sideband communications are
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* already up.
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*/
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if (!usb4_port_device_is_offline(port->usb4))
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return;
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tb_port_dbg(port, "enabling sideband transactions\n");
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for (i = 1; i <= TB_MAX_RETIMER_INDEX; i++)
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usb4_port_retimer_set_inbound_sbtx(port, i);
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}
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static void tb_retimer_unset_inbound_sbtx(struct tb_port *port)
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{
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int i;
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/*
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* When USB4 port is offline we need to keep the sideband
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* communications up to make it possible to communicate with
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* the connected retimers.
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*/
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if (usb4_port_device_is_offline(port->usb4))
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return;
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tb_port_dbg(port, "disabling sideband transactions\n");
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for (i = TB_MAX_RETIMER_INDEX; i >= 1; i--)
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usb4_port_retimer_unset_inbound_sbtx(port, i);
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}
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static ssize_t nvm_authenticate_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct tb_retimer *rt = tb_to_retimer(dev);
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int val, ret;
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pm_runtime_get_sync(&rt->dev);
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if (!mutex_trylock(&rt->tb->lock)) {
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ret = restart_syscall();
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goto exit_rpm;
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}
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if (!rt->nvm) {
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ret = -EAGAIN;
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goto exit_unlock;
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}
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ret = kstrtoint(buf, 10, &val);
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if (ret)
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goto exit_unlock;
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/* Always clear status */
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rt->auth_status = 0;
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if (val) {
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/*
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* When NVM authentication starts the retimer is not
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* accessible so calling tb_retimer_unset_inbound_sbtx()
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* will fail and therefore we do not call it. Exception
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* is when the validation fails or we only write the new
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* NVM image without authentication.
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*/
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tb_retimer_set_inbound_sbtx(rt->port);
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if (val == AUTHENTICATE_ONLY) {
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ret = tb_retimer_nvm_authenticate(rt, true);
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} else {
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if (!rt->nvm->flushed) {
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if (!rt->nvm->buf) {
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ret = -EINVAL;
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goto exit_unlock;
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}
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ret = tb_retimer_nvm_validate_and_write(rt);
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if (ret || val == WRITE_ONLY)
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goto exit_unlock;
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}
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if (val == WRITE_AND_AUTHENTICATE)
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ret = tb_retimer_nvm_authenticate(rt, false);
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}
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}
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exit_unlock:
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if (ret || val == WRITE_ONLY)
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tb_retimer_unset_inbound_sbtx(rt->port);
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mutex_unlock(&rt->tb->lock);
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exit_rpm:
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pm_runtime_mark_last_busy(&rt->dev);
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pm_runtime_put_autosuspend(&rt->dev);
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if (ret)
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return ret;
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return count;
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}
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static DEVICE_ATTR_RW(nvm_authenticate);
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static ssize_t nvm_version_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct tb_retimer *rt = tb_to_retimer(dev);
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int ret;
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if (!mutex_trylock(&rt->tb->lock))
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return restart_syscall();
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if (!rt->nvm)
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ret = -EAGAIN;
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else
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ret = sysfs_emit(buf, "%x.%x\n", rt->nvm->major, rt->nvm->minor);
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mutex_unlock(&rt->tb->lock);
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return ret;
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}
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static DEVICE_ATTR_RO(nvm_version);
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static ssize_t vendor_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct tb_retimer *rt = tb_to_retimer(dev);
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return sysfs_emit(buf, "%#x\n", rt->vendor);
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}
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static DEVICE_ATTR_RO(vendor);
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static struct attribute *retimer_attrs[] = {
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&dev_attr_device.attr,
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&dev_attr_nvm_authenticate.attr,
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&dev_attr_nvm_version.attr,
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&dev_attr_vendor.attr,
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NULL
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};
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static const struct attribute_group retimer_group = {
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.attrs = retimer_attrs,
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};
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static const struct attribute_group *retimer_groups[] = {
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&retimer_group,
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NULL
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};
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static void tb_retimer_release(struct device *dev)
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{
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struct tb_retimer *rt = tb_to_retimer(dev);
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kfree(rt);
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}
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struct device_type tb_retimer_type = {
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.name = "thunderbolt_retimer",
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.groups = retimer_groups,
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.release = tb_retimer_release,
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};
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static int tb_retimer_add(struct tb_port *port, u8 index, u32 auth_status)
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{
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struct tb_retimer *rt;
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u32 vendor, device;
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int ret;
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ret = usb4_port_retimer_read(port, index, USB4_SB_VENDOR_ID, &vendor,
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sizeof(vendor));
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if (ret) {
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if (ret != -ENODEV)
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tb_port_warn(port, "failed read retimer VendorId: %d\n", ret);
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return ret;
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}
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ret = usb4_port_retimer_read(port, index, USB4_SB_PRODUCT_ID, &device,
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sizeof(device));
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if (ret) {
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if (ret != -ENODEV)
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tb_port_warn(port, "failed read retimer ProductId: %d\n", ret);
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return ret;
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}
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/*
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* Check that it supports NVM operations. If not then don't add
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* the device at all.
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*/
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ret = usb4_port_retimer_nvm_sector_size(port, index);
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if (ret < 0)
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return ret;
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rt = kzalloc(sizeof(*rt), GFP_KERNEL);
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if (!rt)
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return -ENOMEM;
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rt->index = index;
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rt->vendor = vendor;
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rt->device = device;
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rt->auth_status = auth_status;
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rt->port = port;
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rt->tb = port->sw->tb;
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rt->dev.parent = &port->usb4->dev;
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rt->dev.bus = &tb_bus_type;
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rt->dev.type = &tb_retimer_type;
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dev_set_name(&rt->dev, "%s:%u.%u", dev_name(&port->sw->dev),
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port->port, index);
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ret = device_register(&rt->dev);
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if (ret) {
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dev_err(&rt->dev, "failed to register retimer: %d\n", ret);
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put_device(&rt->dev);
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return ret;
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}
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ret = tb_retimer_nvm_add(rt);
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if (ret) {
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dev_err(&rt->dev, "failed to add NVM devices: %d\n", ret);
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device_unregister(&rt->dev);
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return ret;
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}
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dev_info(&rt->dev, "new retimer found, vendor=%#x device=%#x\n",
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rt->vendor, rt->device);
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pm_runtime_no_callbacks(&rt->dev);
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pm_runtime_set_active(&rt->dev);
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pm_runtime_enable(&rt->dev);
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pm_runtime_set_autosuspend_delay(&rt->dev, TB_AUTOSUSPEND_DELAY);
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pm_runtime_mark_last_busy(&rt->dev);
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pm_runtime_use_autosuspend(&rt->dev);
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return 0;
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}
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static void tb_retimer_remove(struct tb_retimer *rt)
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{
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dev_info(&rt->dev, "retimer disconnected\n");
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tb_nvm_free(rt->nvm);
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device_unregister(&rt->dev);
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}
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struct tb_retimer_lookup {
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const struct tb_port *port;
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u8 index;
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};
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static int retimer_match(struct device *dev, void *data)
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{
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const struct tb_retimer_lookup *lookup = data;
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struct tb_retimer *rt = tb_to_retimer(dev);
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return rt && rt->port == lookup->port && rt->index == lookup->index;
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}
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static struct tb_retimer *tb_port_find_retimer(struct tb_port *port, u8 index)
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{
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struct tb_retimer_lookup lookup = { .port = port, .index = index };
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struct device *dev;
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dev = device_find_child(&port->usb4->dev, &lookup, retimer_match);
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if (dev)
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return tb_to_retimer(dev);
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return NULL;
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}
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/**
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* tb_retimer_scan() - Scan for on-board retimers under port
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* @port: USB4 port to scan
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* @add: If true also registers found retimers
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*
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* Brings the sideband into a state where retimers can be accessed.
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* Then Tries to enumerate on-board retimers connected to @port. Found
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* retimers are registered as children of @port if @add is set. Does
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* not scan for cable retimers for now.
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*/
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int tb_retimer_scan(struct tb_port *port, bool add)
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{
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u32 status[TB_MAX_RETIMER_INDEX + 1] = {};
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int ret, i, last_idx = 0;
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/*
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* Send broadcast RT to make sure retimer indices facing this
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* port are set.
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*/
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ret = usb4_port_enumerate_retimers(port);
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if (ret)
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return ret;
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/*
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* Immediately after sending enumerate retimers read the
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* authentication status of each retimer.
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*/
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tb_retimer_nvm_authenticate_status(port, status);
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/*
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* Enable sideband channel for each retimer. We can do this
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* regardless whether there is device connected or not.
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*/
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tb_retimer_set_inbound_sbtx(port);
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for (i = 1; i <= TB_MAX_RETIMER_INDEX; i++) {
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/*
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* Last retimer is true only for the last on-board
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* retimer (the one connected directly to the Type-C
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* port).
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*/
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ret = usb4_port_retimer_is_last(port, i);
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if (ret > 0)
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last_idx = i;
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else if (ret < 0)
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break;
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}
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tb_retimer_unset_inbound_sbtx(port);
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if (!last_idx)
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return 0;
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/* Add on-board retimers if they do not exist already */
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ret = 0;
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for (i = 1; i <= last_idx; i++) {
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struct tb_retimer *rt;
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rt = tb_port_find_retimer(port, i);
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if (rt) {
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put_device(&rt->dev);
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} else if (add) {
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ret = tb_retimer_add(port, i, status[i]);
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if (ret && ret != -EOPNOTSUPP)
|
|
break;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int remove_retimer(struct device *dev, void *data)
|
|
{
|
|
struct tb_retimer *rt = tb_to_retimer(dev);
|
|
struct tb_port *port = data;
|
|
|
|
if (rt && rt->port == port)
|
|
tb_retimer_remove(rt);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tb_retimer_remove_all() - Remove all retimers under port
|
|
* @port: USB4 port whose retimers to remove
|
|
*
|
|
* This removes all previously added retimers under @port.
|
|
*/
|
|
void tb_retimer_remove_all(struct tb_port *port)
|
|
{
|
|
struct usb4_port *usb4;
|
|
|
|
usb4 = port->usb4;
|
|
if (usb4)
|
|
device_for_each_child_reverse(&usb4->dev, port,
|
|
remove_retimer);
|
|
}
|