// SPDX-License-Identifier: GPL-2.0+
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/*
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* FireWire Serial driver
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*
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* Copyright (C) 2012 Peter Hurley <peter@hurleysoftware.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/device.h>
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#include <linux/mod_devicetable.h>
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#include <linux/rculist.h>
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#include <linux/workqueue.h>
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#include <linux/ratelimit.h>
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#include <linux/bug.h>
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#include <linux/uaccess.h>
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#include "fwserial.h"
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inline u64 be32_to_u64(__be32 hi, __be32 lo)
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{
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return ((u64)be32_to_cpu(hi) << 32 | be32_to_cpu(lo));
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}
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#define LINUX_VENDOR_ID 0xd00d1eU /* same id used in card root directory */
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#define FWSERIAL_VERSION 0x00e81cU /* must be unique within LINUX_VENDOR_ID */
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/* configurable options */
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static int num_ttys = 4; /* # of std ttys to create per fw_card */
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/* - doubles as loopback port index */
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static bool auto_connect = true; /* try to VIRT_CABLE to every peer */
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static bool create_loop_dev = true; /* create a loopback device for each card */
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module_param_named(ttys, num_ttys, int, 0644);
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module_param_named(auto, auto_connect, bool, 0644);
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module_param_named(loop, create_loop_dev, bool, 0644);
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/*
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* Threshold below which the tty is woken for writing
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* - should be equal to WAKEUP_CHARS in drivers/tty/n_tty.c because
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* even if the writer is woken, n_tty_poll() won't set EPOLLOUT until
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* our fifo is below this level
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*/
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#define WAKEUP_CHARS 256
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/**
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* fwserial_list: list of every fw_serial created for each fw_card
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* See discussion in fwserial_probe.
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*/
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static LIST_HEAD(fwserial_list);
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static DEFINE_MUTEX(fwserial_list_mutex);
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/**
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* port_table: array of tty ports allocated to each fw_card
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*
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* tty ports are allocated during probe when an fw_serial is first
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* created for a given fw_card. Ports are allocated in a contiguous block,
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* each block consisting of 'num_ports' ports.
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*/
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static struct fwtty_port *port_table[MAX_TOTAL_PORTS];
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static DEFINE_MUTEX(port_table_lock);
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static bool port_table_corrupt;
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#define FWTTY_INVALID_INDEX MAX_TOTAL_PORTS
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#define loop_idx(port) (((port)->index) / num_ports)
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#define table_idx(loop) ((loop) * num_ports + num_ttys)
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/* total # of tty ports created per fw_card */
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static int num_ports;
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/* slab used as pool for struct fwtty_transactions */
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static struct kmem_cache *fwtty_txn_cache;
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struct tty_driver *fwtty_driver;
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static struct tty_driver *fwloop_driver;
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static struct dentry *fwserial_debugfs;
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struct fwtty_transaction;
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typedef void (*fwtty_transaction_cb)(struct fw_card *card, int rcode,
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void *data, size_t length,
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struct fwtty_transaction *txn);
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struct fwtty_transaction {
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struct fw_transaction fw_txn;
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fwtty_transaction_cb callback;
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struct fwtty_port *port;
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union {
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struct dma_pending dma_pended;
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};
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};
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#define to_device(a, b) (a->b)
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#define fwtty_err(p, fmt, ...) \
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dev_err(to_device(p, device), fmt, ##__VA_ARGS__)
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#define fwtty_info(p, fmt, ...) \
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dev_info(to_device(p, device), fmt, ##__VA_ARGS__)
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#define fwtty_notice(p, fmt, ...) \
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dev_notice(to_device(p, device), fmt, ##__VA_ARGS__)
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#define fwtty_dbg(p, fmt, ...) \
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dev_dbg(to_device(p, device), "%s: " fmt, __func__, ##__VA_ARGS__)
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#define fwtty_err_ratelimited(p, fmt, ...) \
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dev_err_ratelimited(to_device(p, device), fmt, ##__VA_ARGS__)
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#ifdef DEBUG
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static inline void debug_short_write(struct fwtty_port *port, int c, int n)
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{
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int avail;
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if (n < c) {
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spin_lock_bh(&port->lock);
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avail = dma_fifo_avail(&port->tx_fifo);
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spin_unlock_bh(&port->lock);
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fwtty_dbg(port, "short write: avail:%d req:%d wrote:%d\n",
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avail, c, n);
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}
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}
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#else
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#define debug_short_write(port, c, n)
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#endif
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static struct fwtty_peer *__fwserial_peer_by_node_id(struct fw_card *card,
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int generation, int id);
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#ifdef FWTTY_PROFILING
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static void fwtty_profile_fifo(struct fwtty_port *port, unsigned int *stat)
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{
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spin_lock_bh(&port->lock);
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fwtty_profile_data(stat, dma_fifo_avail(&port->tx_fifo));
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spin_unlock_bh(&port->lock);
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}
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static void fwtty_dump_profile(struct seq_file *m, struct stats *stats)
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{
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/* for each stat, print sum of 0 to 2^k, then individually */
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int k = 4;
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unsigned int sum;
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int j;
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char t[10];
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snprintf(t, 10, "< %d", 1 << k);
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seq_printf(m, "\n%14s %6s", " ", t);
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for (j = k + 1; j < DISTRIBUTION_MAX_INDEX; ++j)
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seq_printf(m, "%6d", 1 << j);
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++k;
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for (j = 0, sum = 0; j <= k; ++j)
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sum += stats->reads[j];
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seq_printf(m, "\n%14s: %6d", "reads", sum);
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for (j = k + 1; j <= DISTRIBUTION_MAX_INDEX; ++j)
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seq_printf(m, "%6d", stats->reads[j]);
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for (j = 0, sum = 0; j <= k; ++j)
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sum += stats->writes[j];
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seq_printf(m, "\n%14s: %6d", "writes", sum);
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for (j = k + 1; j <= DISTRIBUTION_MAX_INDEX; ++j)
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seq_printf(m, "%6d", stats->writes[j]);
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for (j = 0, sum = 0; j <= k; ++j)
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sum += stats->txns[j];
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seq_printf(m, "\n%14s: %6d", "txns", sum);
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for (j = k + 1; j <= DISTRIBUTION_MAX_INDEX; ++j)
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seq_printf(m, "%6d", stats->txns[j]);
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for (j = 0, sum = 0; j <= k; ++j)
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sum += stats->unthrottle[j];
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seq_printf(m, "\n%14s: %6d", "avail @ unthr", sum);
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for (j = k + 1; j <= DISTRIBUTION_MAX_INDEX; ++j)
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seq_printf(m, "%6d", stats->unthrottle[j]);
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}
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#else
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#define fwtty_profile_fifo(port, stat)
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#define fwtty_dump_profile(m, stats)
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#endif
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/*
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* Returns the max receive packet size for the given node
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* Devices which are OHCI v1.0/ v1.1/ v1.2-draft or RFC 2734 compliant
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* are required by specification to support max_rec of 8 (512 bytes) or more.
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*/
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static inline int device_max_receive(struct fw_device *fw_device)
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{
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/* see IEEE 1394-2008 table 8-8 */
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return min(2 << fw_device->max_rec, 4096);
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}
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static void fwtty_log_tx_error(struct fwtty_port *port, int rcode)
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{
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switch (rcode) {
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case RCODE_SEND_ERROR:
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fwtty_err_ratelimited(port, "card busy\n");
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break;
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case RCODE_ADDRESS_ERROR:
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fwtty_err_ratelimited(port, "bad unit addr or write length\n");
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break;
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case RCODE_DATA_ERROR:
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fwtty_err_ratelimited(port, "failed rx\n");
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break;
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case RCODE_NO_ACK:
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fwtty_err_ratelimited(port, "missing ack\n");
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break;
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case RCODE_BUSY:
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fwtty_err_ratelimited(port, "remote busy\n");
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break;
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default:
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fwtty_err_ratelimited(port, "failed tx: %d\n", rcode);
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}
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}
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static void fwtty_common_callback(struct fw_card *card, int rcode,
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void *payload, size_t len, void *cb_data)
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{
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struct fwtty_transaction *txn = cb_data;
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struct fwtty_port *port = txn->port;
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if (port && rcode != RCODE_COMPLETE)
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fwtty_log_tx_error(port, rcode);
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if (txn->callback)
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txn->callback(card, rcode, payload, len, txn);
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kmem_cache_free(fwtty_txn_cache, txn);
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}
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static int fwtty_send_data_async(struct fwtty_peer *peer, int tcode,
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unsigned long long addr, void *payload,
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size_t len, fwtty_transaction_cb callback,
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struct fwtty_port *port)
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{
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struct fwtty_transaction *txn;
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int generation;
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txn = kmem_cache_alloc(fwtty_txn_cache, GFP_ATOMIC);
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if (!txn)
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return -ENOMEM;
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txn->callback = callback;
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txn->port = port;
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generation = peer->generation;
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smp_rmb();
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fw_send_request(peer->serial->card, &txn->fw_txn, tcode,
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peer->node_id, generation, peer->speed, addr, payload,
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len, fwtty_common_callback, txn);
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return 0;
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}
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static void fwtty_send_txn_async(struct fwtty_peer *peer,
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struct fwtty_transaction *txn, int tcode,
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unsigned long long addr, void *payload,
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size_t len, fwtty_transaction_cb callback,
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struct fwtty_port *port)
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{
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int generation;
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txn->callback = callback;
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txn->port = port;
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generation = peer->generation;
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smp_rmb();
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fw_send_request(peer->serial->card, &txn->fw_txn, tcode,
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peer->node_id, generation, peer->speed, addr, payload,
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len, fwtty_common_callback, txn);
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}
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static void __fwtty_restart_tx(struct fwtty_port *port)
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{
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int len, avail;
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len = dma_fifo_out_level(&port->tx_fifo);
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if (len)
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schedule_delayed_work(&port->drain, 0);
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avail = dma_fifo_avail(&port->tx_fifo);
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fwtty_dbg(port, "fifo len: %d avail: %d\n", len, avail);
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}
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static void fwtty_restart_tx(struct fwtty_port *port)
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{
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spin_lock_bh(&port->lock);
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__fwtty_restart_tx(port);
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spin_unlock_bh(&port->lock);
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}
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/**
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* fwtty_update_port_status - decodes & dispatches line status changes
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*
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* Note: in loopback, the port->lock is being held. Only use functions that
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* don't attempt to reclaim the port->lock.
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*/
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static void fwtty_update_port_status(struct fwtty_port *port,
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unsigned int status)
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{
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unsigned int delta;
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struct tty_struct *tty;
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/* simulated LSR/MSR status from remote */
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status &= ~MCTRL_MASK;
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delta = (port->mstatus ^ status) & ~MCTRL_MASK;
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delta &= ~(status & TIOCM_RNG);
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port->mstatus = status;
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if (delta & TIOCM_RNG)
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++port->icount.rng;
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if (delta & TIOCM_DSR)
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++port->icount.dsr;
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if (delta & TIOCM_CAR)
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++port->icount.dcd;
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if (delta & TIOCM_CTS)
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++port->icount.cts;
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fwtty_dbg(port, "status: %x delta: %x\n", status, delta);
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if (delta & TIOCM_CAR) {
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tty = tty_port_tty_get(&port->port);
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if (tty && !C_CLOCAL(tty)) {
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if (status & TIOCM_CAR)
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wake_up_interruptible(&port->port.open_wait);
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else
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schedule_work(&port->hangup);
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}
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tty_kref_put(tty);
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}
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if (delta & TIOCM_CTS) {
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tty = tty_port_tty_get(&port->port);
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if (tty && C_CRTSCTS(tty)) {
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if (tty->hw_stopped) {
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if (status & TIOCM_CTS) {
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tty->hw_stopped = 0;
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if (port->loopback)
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__fwtty_restart_tx(port);
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else
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fwtty_restart_tx(port);
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}
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} else {
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if (~status & TIOCM_CTS)
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tty->hw_stopped = 1;
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}
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}
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tty_kref_put(tty);
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} else if (delta & OOB_TX_THROTTLE) {
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tty = tty_port_tty_get(&port->port);
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if (tty) {
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if (tty->hw_stopped) {
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if (~status & OOB_TX_THROTTLE) {
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tty->hw_stopped = 0;
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if (port->loopback)
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__fwtty_restart_tx(port);
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else
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fwtty_restart_tx(port);
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}
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} else {
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if (status & OOB_TX_THROTTLE)
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tty->hw_stopped = 1;
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}
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}
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tty_kref_put(tty);
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}
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if (delta & (UART_LSR_BI << 24)) {
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if (status & (UART_LSR_BI << 24)) {
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port->break_last = jiffies;
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schedule_delayed_work(&port->emit_breaks, 0);
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} else {
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/* run emit_breaks one last time (if pending) */
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mod_delayed_work(system_wq, &port->emit_breaks, 0);
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}
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}
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if (delta & (TIOCM_DSR | TIOCM_CAR | TIOCM_CTS | TIOCM_RNG))
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wake_up_interruptible(&port->port.delta_msr_wait);
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}
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/**
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* __fwtty_port_line_status - generate 'line status' for indicated port
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*
|
* This function returns a remote 'MSR' state based on the local 'MCR' state,
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* as if a null modem cable was attached. The actual status is a mangling
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* of TIOCM_* bits suitable for sending to a peer's status_addr.
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*
|
* Note: caller must be holding port lock
|
*/
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static unsigned int __fwtty_port_line_status(struct fwtty_port *port)
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{
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unsigned int status = 0;
|
|
/* TODO: add module param to tie RNG to DTR as well */
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|
if (port->mctrl & TIOCM_DTR)
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status |= TIOCM_DSR | TIOCM_CAR;
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if (port->mctrl & TIOCM_RTS)
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status |= TIOCM_CTS;
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if (port->mctrl & OOB_RX_THROTTLE)
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status |= OOB_TX_THROTTLE;
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/* emulate BRK as add'l line status */
|
if (port->break_ctl)
|
status |= UART_LSR_BI << 24;
|
|
return status;
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}
|
|
/**
|
* __fwtty_write_port_status - send the port line status to peer
|
*
|
* Note: caller must be holding the port lock.
|
*/
|
static int __fwtty_write_port_status(struct fwtty_port *port)
|
{
|
struct fwtty_peer *peer;
|
int err = -ENOENT;
|
unsigned int status = __fwtty_port_line_status(port);
|
|
rcu_read_lock();
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peer = rcu_dereference(port->peer);
|
if (peer) {
|
err = fwtty_send_data_async(peer, TCODE_WRITE_QUADLET_REQUEST,
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peer->status_addr, &status,
|
sizeof(status), NULL, port);
|
}
|
rcu_read_unlock();
|
|
return err;
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}
|
|
/**
|
* fwtty_write_port_status - same as above but locked by port lock
|
*/
|
static int fwtty_write_port_status(struct fwtty_port *port)
|
{
|
int err;
|
|
spin_lock_bh(&port->lock);
|
err = __fwtty_write_port_status(port);
|
spin_unlock_bh(&port->lock);
|
return err;
|
}
|
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static void fwtty_throttle_port(struct fwtty_port *port)
|
{
|
struct tty_struct *tty;
|
unsigned int old;
|
|
tty = tty_port_tty_get(&port->port);
|
if (!tty)
|
return;
|
|
spin_lock_bh(&port->lock);
|
|
old = port->mctrl;
|
port->mctrl |= OOB_RX_THROTTLE;
|
if (C_CRTSCTS(tty))
|
port->mctrl &= ~TIOCM_RTS;
|
if (~old & OOB_RX_THROTTLE)
|
__fwtty_write_port_status(port);
|
|
spin_unlock_bh(&port->lock);
|
|
tty_kref_put(tty);
|
}
|
|
/**
|
* fwtty_do_hangup - wait for ldisc to deliver all pending rx; only then hangup
|
*
|
* When the remote has finished tx, and all in-flight rx has been received and
|
* pushed to the flip buffer, the remote may close its device. This will
|
* drop DTR on the remote which will drop carrier here. Typically, the tty is
|
* hung up when carrier is dropped or lost.
|
*
|
* However, there is a race between the hang up and the line discipline
|
* delivering its data to the reader. A hangup will cause the ldisc to flush
|
* (ie., clear) the read buffer and flip buffer. Because of firewire's
|
* relatively high throughput, the ldisc frequently lags well behind the driver,
|
* resulting in lost data (which has already been received and written to
|
* the flip buffer) when the remote closes its end.
|
*
|
* Unfortunately, since the flip buffer offers no direct method for determining
|
* if it holds data, ensuring the ldisc has delivered all data is problematic.
|
*/
|
|
/* FIXME: drop this workaround when __tty_hangup waits for ldisc completion */
|
static void fwtty_do_hangup(struct work_struct *work)
|
{
|
struct fwtty_port *port = to_port(work, hangup);
|
struct tty_struct *tty;
|
|
schedule_timeout_uninterruptible(msecs_to_jiffies(50));
|
|
tty = tty_port_tty_get(&port->port);
|
if (tty)
|
tty_vhangup(tty);
|
tty_kref_put(tty);
|
}
|
|
static void fwtty_emit_breaks(struct work_struct *work)
|
{
|
struct fwtty_port *port = to_port(to_delayed_work(work), emit_breaks);
|
static const char buf[16];
|
unsigned long now = jiffies;
|
unsigned long elapsed = now - port->break_last;
|
int n, t, c, brk = 0;
|
|
/* generate breaks at the line rate (but at least 1) */
|
n = (elapsed * port->cps) / HZ + 1;
|
port->break_last = now;
|
|
fwtty_dbg(port, "sending %d brks\n", n);
|
|
while (n) {
|
t = min(n, 16);
|
c = tty_insert_flip_string_fixed_flag(&port->port, buf,
|
TTY_BREAK, t);
|
n -= c;
|
brk += c;
|
if (c < t)
|
break;
|
}
|
tty_flip_buffer_push(&port->port);
|
|
if (port->mstatus & (UART_LSR_BI << 24))
|
schedule_delayed_work(&port->emit_breaks, FREQ_BREAKS);
|
port->icount.brk += brk;
|
}
|
|
static int fwtty_rx(struct fwtty_port *port, unsigned char *data, size_t len)
|
{
|
int c, n = len;
|
unsigned int lsr;
|
int err = 0;
|
|
fwtty_dbg(port, "%d\n", n);
|
fwtty_profile_data(port->stats.reads, n);
|
|
if (port->write_only) {
|
n = 0;
|
goto out;
|
}
|
|
/* disregard break status; breaks are generated by emit_breaks work */
|
lsr = (port->mstatus >> 24) & ~UART_LSR_BI;
|
|
if (port->overrun)
|
lsr |= UART_LSR_OE;
|
|
if (lsr & UART_LSR_OE)
|
++port->icount.overrun;
|
|
lsr &= port->status_mask;
|
if (lsr & ~port->ignore_mask & UART_LSR_OE) {
|
if (!tty_insert_flip_char(&port->port, 0, TTY_OVERRUN)) {
|
err = -EIO;
|
goto out;
|
}
|
}
|
port->overrun = false;
|
|
if (lsr & port->ignore_mask & ~UART_LSR_OE) {
|
/* TODO: don't drop SAK and Magic SysRq here */
|
n = 0;
|
goto out;
|
}
|
|
c = tty_insert_flip_string_fixed_flag(&port->port, data, TTY_NORMAL, n);
|
if (c > 0)
|
tty_flip_buffer_push(&port->port);
|
n -= c;
|
|
if (n) {
|
port->overrun = true;
|
err = -EIO;
|
fwtty_err_ratelimited(port, "flip buffer overrun\n");
|
|
} else {
|
/* throttle the sender if remaining flip buffer space has
|
* reached high watermark to avoid losing data which may be
|
* in-flight. Since the AR request context is 32k, that much
|
* data may have _already_ been acked.
|
*/
|
if (tty_buffer_space_avail(&port->port) < HIGH_WATERMARK)
|
fwtty_throttle_port(port);
|
}
|
|
out:
|
port->icount.rx += len;
|
port->stats.lost += n;
|
return err;
|
}
|
|
/**
|
* fwtty_port_handler - bus address handler for port reads/writes
|
* @parameters: fw_address_callback_t as specified by firewire core interface
|
*
|
* This handler is responsible for handling inbound read/write dma from remotes.
|
*/
|
static void fwtty_port_handler(struct fw_card *card,
|
struct fw_request *request,
|
int tcode, int destination, int source,
|
int generation,
|
unsigned long long addr,
|
void *data, size_t len,
|
void *callback_data)
|
{
|
struct fwtty_port *port = callback_data;
|
struct fwtty_peer *peer;
|
int err;
|
int rcode;
|
|
/* Only accept rx from the peer virtual-cabled to this port */
|
rcu_read_lock();
|
peer = __fwserial_peer_by_node_id(card, generation, source);
|
rcu_read_unlock();
|
if (!peer || peer != rcu_access_pointer(port->peer)) {
|
rcode = RCODE_ADDRESS_ERROR;
|
fwtty_err_ratelimited(port, "ignoring unauthenticated data\n");
|
goto respond;
|
}
|
|
switch (tcode) {
|
case TCODE_WRITE_QUADLET_REQUEST:
|
if (addr != port->rx_handler.offset || len != 4) {
|
rcode = RCODE_ADDRESS_ERROR;
|
} else {
|
fwtty_update_port_status(port, *(unsigned int *)data);
|
rcode = RCODE_COMPLETE;
|
}
|
break;
|
|
case TCODE_WRITE_BLOCK_REQUEST:
|
if (addr != port->rx_handler.offset + 4 ||
|
len > port->rx_handler.length - 4) {
|
rcode = RCODE_ADDRESS_ERROR;
|
} else {
|
err = fwtty_rx(port, data, len);
|
switch (err) {
|
case 0:
|
rcode = RCODE_COMPLETE;
|
break;
|
case -EIO:
|
rcode = RCODE_DATA_ERROR;
|
break;
|
default:
|
rcode = RCODE_CONFLICT_ERROR;
|
break;
|
}
|
}
|
break;
|
|
default:
|
rcode = RCODE_TYPE_ERROR;
|
}
|
|
respond:
|
fw_send_response(card, request, rcode);
|
}
|
|
/**
|
* fwtty_tx_complete - callback for tx dma
|
* @data: ignored, has no meaning for write txns
|
* @length: ignored, has no meaning for write txns
|
*
|
* The writer must be woken here if the fifo has been emptied because it
|
* may have slept if chars_in_buffer was != 0
|
*/
|
static void fwtty_tx_complete(struct fw_card *card, int rcode,
|
void *data, size_t length,
|
struct fwtty_transaction *txn)
|
{
|
struct fwtty_port *port = txn->port;
|
int len;
|
|
fwtty_dbg(port, "rcode: %d\n", rcode);
|
|
switch (rcode) {
|
case RCODE_COMPLETE:
|
spin_lock_bh(&port->lock);
|
dma_fifo_out_complete(&port->tx_fifo, &txn->dma_pended);
|
len = dma_fifo_level(&port->tx_fifo);
|
spin_unlock_bh(&port->lock);
|
|
port->icount.tx += txn->dma_pended.len;
|
break;
|
|
default:
|
/* TODO: implement retries */
|
spin_lock_bh(&port->lock);
|
dma_fifo_out_complete(&port->tx_fifo, &txn->dma_pended);
|
len = dma_fifo_level(&port->tx_fifo);
|
spin_unlock_bh(&port->lock);
|
|
port->stats.dropped += txn->dma_pended.len;
|
}
|
|
if (len < WAKEUP_CHARS)
|
tty_port_tty_wakeup(&port->port);
|
}
|
|
static int fwtty_tx(struct fwtty_port *port, bool drain)
|
{
|
struct fwtty_peer *peer;
|
struct fwtty_transaction *txn;
|
struct tty_struct *tty;
|
int n, len;
|
|
tty = tty_port_tty_get(&port->port);
|
if (!tty)
|
return -ENOENT;
|
|
rcu_read_lock();
|
peer = rcu_dereference(port->peer);
|
if (!peer) {
|
n = -EIO;
|
goto out;
|
}
|
|
if (test_and_set_bit(IN_TX, &port->flags)) {
|
n = -EALREADY;
|
goto out;
|
}
|
|
/* try to write as many dma transactions out as possible */
|
n = -EAGAIN;
|
while (!tty->stopped && !tty->hw_stopped &&
|
!test_bit(STOP_TX, &port->flags)) {
|
txn = kmem_cache_alloc(fwtty_txn_cache, GFP_ATOMIC);
|
if (!txn) {
|
n = -ENOMEM;
|
break;
|
}
|
|
spin_lock_bh(&port->lock);
|
n = dma_fifo_out_pend(&port->tx_fifo, &txn->dma_pended);
|
spin_unlock_bh(&port->lock);
|
|
fwtty_dbg(port, "out: %u rem: %d\n", txn->dma_pended.len, n);
|
|
if (n < 0) {
|
kmem_cache_free(fwtty_txn_cache, txn);
|
if (n == -EAGAIN) {
|
++port->stats.tx_stall;
|
} else if (n == -ENODATA) {
|
fwtty_profile_data(port->stats.txns, 0);
|
} else {
|
++port->stats.fifo_errs;
|
fwtty_err_ratelimited(port, "fifo err: %d\n",
|
n);
|
}
|
break;
|
}
|
|
fwtty_profile_data(port->stats.txns, txn->dma_pended.len);
|
|
fwtty_send_txn_async(peer, txn, TCODE_WRITE_BLOCK_REQUEST,
|
peer->fifo_addr, txn->dma_pended.data,
|
txn->dma_pended.len, fwtty_tx_complete,
|
port);
|
++port->stats.sent;
|
|
/*
|
* Stop tx if the 'last view' of the fifo is empty or if
|
* this is the writer and there's not enough data to bother
|
*/
|
if (n == 0 || (!drain && n < WRITER_MINIMUM))
|
break;
|
}
|
|
if (n >= 0 || n == -EAGAIN || n == -ENOMEM || n == -ENODATA) {
|
spin_lock_bh(&port->lock);
|
len = dma_fifo_out_level(&port->tx_fifo);
|
if (len) {
|
unsigned long delay = (n == -ENOMEM) ? HZ : 1;
|
|
schedule_delayed_work(&port->drain, delay);
|
}
|
len = dma_fifo_level(&port->tx_fifo);
|
spin_unlock_bh(&port->lock);
|
|
/* wakeup the writer */
|
if (drain && len < WAKEUP_CHARS)
|
tty_wakeup(tty);
|
}
|
|
clear_bit(IN_TX, &port->flags);
|
wake_up_interruptible(&port->wait_tx);
|
|
out:
|
rcu_read_unlock();
|
tty_kref_put(tty);
|
return n;
|
}
|
|
static void fwtty_drain_tx(struct work_struct *work)
|
{
|
struct fwtty_port *port = to_port(to_delayed_work(work), drain);
|
|
fwtty_tx(port, true);
|
}
|
|
static void fwtty_write_xchar(struct fwtty_port *port, char ch)
|
{
|
struct fwtty_peer *peer;
|
|
++port->stats.xchars;
|
|
fwtty_dbg(port, "%02x\n", ch);
|
|
rcu_read_lock();
|
peer = rcu_dereference(port->peer);
|
if (peer) {
|
fwtty_send_data_async(peer, TCODE_WRITE_BLOCK_REQUEST,
|
peer->fifo_addr, &ch, sizeof(ch),
|
NULL, port);
|
}
|
rcu_read_unlock();
|
}
|
|
static struct fwtty_port *fwtty_port_get(unsigned int index)
|
{
|
struct fwtty_port *port;
|
|
if (index >= MAX_TOTAL_PORTS)
|
return NULL;
|
|
mutex_lock(&port_table_lock);
|
port = port_table[index];
|
if (port)
|
kref_get(&port->serial->kref);
|
mutex_unlock(&port_table_lock);
|
return port;
|
}
|
|
static int fwtty_ports_add(struct fw_serial *serial)
|
{
|
int err = -EBUSY;
|
int i, j;
|
|
if (port_table_corrupt)
|
return err;
|
|
mutex_lock(&port_table_lock);
|
for (i = 0; i + num_ports <= MAX_TOTAL_PORTS; i += num_ports) {
|
if (!port_table[i]) {
|
for (j = 0; j < num_ports; ++i, ++j) {
|
serial->ports[j]->index = i;
|
port_table[i] = serial->ports[j];
|
}
|
err = 0;
|
break;
|
}
|
}
|
mutex_unlock(&port_table_lock);
|
return err;
|
}
|
|
static void fwserial_destroy(struct kref *kref)
|
{
|
struct fw_serial *serial = to_serial(kref, kref);
|
struct fwtty_port **ports = serial->ports;
|
int j, i = ports[0]->index;
|
|
synchronize_rcu();
|
|
mutex_lock(&port_table_lock);
|
for (j = 0; j < num_ports; ++i, ++j) {
|
port_table_corrupt |= port_table[i] != ports[j];
|
WARN_ONCE(port_table_corrupt, "port_table[%d]: %p != ports[%d]: %p",
|
i, port_table[i], j, ports[j]);
|
|
port_table[i] = NULL;
|
}
|
mutex_unlock(&port_table_lock);
|
|
for (j = 0; j < num_ports; ++j) {
|
fw_core_remove_address_handler(&ports[j]->rx_handler);
|
tty_port_destroy(&ports[j]->port);
|
kfree(ports[j]);
|
}
|
kfree(serial);
|
}
|
|
static void fwtty_port_put(struct fwtty_port *port)
|
{
|
kref_put(&port->serial->kref, fwserial_destroy);
|
}
|
|
static void fwtty_port_dtr_rts(struct tty_port *tty_port, int on)
|
{
|
struct fwtty_port *port = to_port(tty_port, port);
|
|
fwtty_dbg(port, "on/off: %d\n", on);
|
|
spin_lock_bh(&port->lock);
|
/* Don't change carrier state if this is a console */
|
if (!port->port.console) {
|
if (on)
|
port->mctrl |= TIOCM_DTR | TIOCM_RTS;
|
else
|
port->mctrl &= ~(TIOCM_DTR | TIOCM_RTS);
|
}
|
|
__fwtty_write_port_status(port);
|
spin_unlock_bh(&port->lock);
|
}
|
|
/**
|
* fwtty_port_carrier_raised: required tty_port operation
|
*
|
* This port operation is polled after a tty has been opened and is waiting for
|
* carrier detect -- see drivers/tty/tty_port:tty_port_block_til_ready().
|
*/
|
static int fwtty_port_carrier_raised(struct tty_port *tty_port)
|
{
|
struct fwtty_port *port = to_port(tty_port, port);
|
int rc;
|
|
rc = (port->mstatus & TIOCM_CAR);
|
|
fwtty_dbg(port, "%d\n", rc);
|
|
return rc;
|
}
|
|
static unsigned int set_termios(struct fwtty_port *port, struct tty_struct *tty)
|
{
|
unsigned int baud, frame;
|
|
baud = tty_termios_baud_rate(&tty->termios);
|
tty_termios_encode_baud_rate(&tty->termios, baud, baud);
|
|
/* compute bit count of 2 frames */
|
frame = 12 + ((C_CSTOPB(tty)) ? 4 : 2) + ((C_PARENB(tty)) ? 2 : 0);
|
|
switch (C_CSIZE(tty)) {
|
case CS5:
|
frame -= (C_CSTOPB(tty)) ? 1 : 0;
|
break;
|
case CS6:
|
frame += 2;
|
break;
|
case CS7:
|
frame += 4;
|
break;
|
case CS8:
|
frame += 6;
|
break;
|
}
|
|
port->cps = (baud << 1) / frame;
|
|
port->status_mask = UART_LSR_OE;
|
if (_I_FLAG(tty, BRKINT | PARMRK))
|
port->status_mask |= UART_LSR_BI;
|
|
port->ignore_mask = 0;
|
if (I_IGNBRK(tty)) {
|
port->ignore_mask |= UART_LSR_BI;
|
if (I_IGNPAR(tty))
|
port->ignore_mask |= UART_LSR_OE;
|
}
|
|
port->write_only = !C_CREAD(tty);
|
|
/* turn off echo and newline xlat if loopback */
|
if (port->loopback) {
|
tty->termios.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHOKE |
|
ECHONL | ECHOPRT | ECHOCTL);
|
tty->termios.c_oflag &= ~ONLCR;
|
}
|
|
return baud;
|
}
|
|
static int fwtty_port_activate(struct tty_port *tty_port,
|
struct tty_struct *tty)
|
{
|
struct fwtty_port *port = to_port(tty_port, port);
|
unsigned int baud;
|
int err;
|
|
set_bit(TTY_IO_ERROR, &tty->flags);
|
|
err = dma_fifo_alloc(&port->tx_fifo, FWTTY_PORT_TXFIFO_LEN,
|
cache_line_size(),
|
port->max_payload,
|
FWTTY_PORT_MAX_PEND_DMA,
|
GFP_KERNEL);
|
if (err)
|
return err;
|
|
spin_lock_bh(&port->lock);
|
|
baud = set_termios(port, tty);
|
|
/* if console, don't change carrier state */
|
if (!port->port.console) {
|
port->mctrl = 0;
|
if (baud != 0)
|
port->mctrl = TIOCM_DTR | TIOCM_RTS;
|
}
|
|
if (C_CRTSCTS(tty) && ~port->mstatus & TIOCM_CTS)
|
tty->hw_stopped = 1;
|
|
__fwtty_write_port_status(port);
|
spin_unlock_bh(&port->lock);
|
|
clear_bit(TTY_IO_ERROR, &tty->flags);
|
|
return 0;
|
}
|
|
/**
|
* fwtty_port_shutdown
|
*
|
* Note: the tty port core ensures this is not the console and
|
* manages TTY_IO_ERROR properly
|
*/
|
static void fwtty_port_shutdown(struct tty_port *tty_port)
|
{
|
struct fwtty_port *port = to_port(tty_port, port);
|
|
/* TODO: cancel outstanding transactions */
|
|
cancel_delayed_work_sync(&port->emit_breaks);
|
cancel_delayed_work_sync(&port->drain);
|
|
spin_lock_bh(&port->lock);
|
port->flags = 0;
|
port->break_ctl = 0;
|
port->overrun = 0;
|
__fwtty_write_port_status(port);
|
dma_fifo_free(&port->tx_fifo);
|
spin_unlock_bh(&port->lock);
|
}
|
|
static int fwtty_open(struct tty_struct *tty, struct file *fp)
|
{
|
struct fwtty_port *port = tty->driver_data;
|
|
return tty_port_open(&port->port, tty, fp);
|
}
|
|
static void fwtty_close(struct tty_struct *tty, struct file *fp)
|
{
|
struct fwtty_port *port = tty->driver_data;
|
|
tty_port_close(&port->port, tty, fp);
|
}
|
|
static void fwtty_hangup(struct tty_struct *tty)
|
{
|
struct fwtty_port *port = tty->driver_data;
|
|
tty_port_hangup(&port->port);
|
}
|
|
static void fwtty_cleanup(struct tty_struct *tty)
|
{
|
struct fwtty_port *port = tty->driver_data;
|
|
tty->driver_data = NULL;
|
fwtty_port_put(port);
|
}
|
|
static int fwtty_install(struct tty_driver *driver, struct tty_struct *tty)
|
{
|
struct fwtty_port *port = fwtty_port_get(tty->index);
|
int err;
|
|
err = tty_standard_install(driver, tty);
|
if (!err)
|
tty->driver_data = port;
|
else
|
fwtty_port_put(port);
|
return err;
|
}
|
|
static int fwloop_install(struct tty_driver *driver, struct tty_struct *tty)
|
{
|
struct fwtty_port *port = fwtty_port_get(table_idx(tty->index));
|
int err;
|
|
err = tty_standard_install(driver, tty);
|
if (!err)
|
tty->driver_data = port;
|
else
|
fwtty_port_put(port);
|
return err;
|
}
|
|
static int fwtty_write(struct tty_struct *tty, const unsigned char *buf, int c)
|
{
|
struct fwtty_port *port = tty->driver_data;
|
int n, len;
|
|
fwtty_dbg(port, "%d\n", c);
|
fwtty_profile_data(port->stats.writes, c);
|
|
spin_lock_bh(&port->lock);
|
n = dma_fifo_in(&port->tx_fifo, buf, c);
|
len = dma_fifo_out_level(&port->tx_fifo);
|
if (len < DRAIN_THRESHOLD)
|
schedule_delayed_work(&port->drain, 1);
|
spin_unlock_bh(&port->lock);
|
|
if (len >= DRAIN_THRESHOLD)
|
fwtty_tx(port, false);
|
|
debug_short_write(port, c, n);
|
|
return (n < 0) ? 0 : n;
|
}
|
|
static int fwtty_write_room(struct tty_struct *tty)
|
{
|
struct fwtty_port *port = tty->driver_data;
|
int n;
|
|
spin_lock_bh(&port->lock);
|
n = dma_fifo_avail(&port->tx_fifo);
|
spin_unlock_bh(&port->lock);
|
|
fwtty_dbg(port, "%d\n", n);
|
|
return n;
|
}
|
|
static int fwtty_chars_in_buffer(struct tty_struct *tty)
|
{
|
struct fwtty_port *port = tty->driver_data;
|
int n;
|
|
spin_lock_bh(&port->lock);
|
n = dma_fifo_level(&port->tx_fifo);
|
spin_unlock_bh(&port->lock);
|
|
fwtty_dbg(port, "%d\n", n);
|
|
return n;
|
}
|
|
static void fwtty_send_xchar(struct tty_struct *tty, char ch)
|
{
|
struct fwtty_port *port = tty->driver_data;
|
|
fwtty_dbg(port, "%02x\n", ch);
|
|
fwtty_write_xchar(port, ch);
|
}
|
|
static void fwtty_throttle(struct tty_struct *tty)
|
{
|
struct fwtty_port *port = tty->driver_data;
|
|
/*
|
* Ignore throttling (but not unthrottling).
|
* It only makes sense to throttle when data will no longer be
|
* accepted by the tty flip buffer. For example, it is
|
* possible for received data to overflow the tty buffer long
|
* before the line discipline ever has a chance to throttle the driver.
|
* Additionally, the driver may have already completed the I/O
|
* but the tty buffer is still emptying, so the line discipline is
|
* throttling and unthrottling nothing.
|
*/
|
|
++port->stats.throttled;
|
}
|
|
static void fwtty_unthrottle(struct tty_struct *tty)
|
{
|
struct fwtty_port *port = tty->driver_data;
|
|
fwtty_dbg(port, "CRTSCTS: %d\n", C_CRTSCTS(tty) != 0);
|
|
fwtty_profile_fifo(port, port->stats.unthrottle);
|
|
spin_lock_bh(&port->lock);
|
port->mctrl &= ~OOB_RX_THROTTLE;
|
if (C_CRTSCTS(tty))
|
port->mctrl |= TIOCM_RTS;
|
__fwtty_write_port_status(port);
|
spin_unlock_bh(&port->lock);
|
}
|
|
static int check_msr_delta(struct fwtty_port *port, unsigned long mask,
|
struct async_icount *prev)
|
{
|
struct async_icount now;
|
int delta;
|
|
now = port->icount;
|
|
delta = ((mask & TIOCM_RNG && prev->rng != now.rng) ||
|
(mask & TIOCM_DSR && prev->dsr != now.dsr) ||
|
(mask & TIOCM_CAR && prev->dcd != now.dcd) ||
|
(mask & TIOCM_CTS && prev->cts != now.cts));
|
|
*prev = now;
|
|
return delta;
|
}
|
|
static int wait_msr_change(struct fwtty_port *port, unsigned long mask)
|
{
|
struct async_icount prev;
|
|
prev = port->icount;
|
|
return wait_event_interruptible(port->port.delta_msr_wait,
|
check_msr_delta(port, mask, &prev));
|
}
|
|
static int get_serial_info(struct tty_struct *tty,
|
struct serial_struct *ss)
|
{
|
struct fwtty_port *port = tty->driver_data;
|
|
mutex_lock(&port->port.mutex);
|
ss->line = port->index;
|
ss->baud_base = 400000000;
|
ss->close_delay = jiffies_to_msecs(port->port.close_delay) / 10;
|
ss->closing_wait = 3000;
|
mutex_unlock(&port->port.mutex);
|
|
return 0;
|
}
|
|
static int set_serial_info(struct tty_struct *tty,
|
struct serial_struct *ss)
|
{
|
struct fwtty_port *port = tty->driver_data;
|
unsigned int cdelay;
|
|
cdelay = msecs_to_jiffies(ss->close_delay * 10);
|
|
mutex_lock(&port->port.mutex);
|
if (!capable(CAP_SYS_ADMIN)) {
|
if (cdelay != port->port.close_delay ||
|
((ss->flags & ~ASYNC_USR_MASK) !=
|
(port->port.flags & ~ASYNC_USR_MASK))) {
|
mutex_unlock(&port->port.mutex);
|
return -EPERM;
|
}
|
}
|
port->port.close_delay = cdelay;
|
mutex_unlock(&port->port.mutex);
|
|
return 0;
|
}
|
|
static int fwtty_ioctl(struct tty_struct *tty, unsigned int cmd,
|
unsigned long arg)
|
{
|
struct fwtty_port *port = tty->driver_data;
|
int err;
|
|
switch (cmd) {
|
case TIOCMIWAIT:
|
err = wait_msr_change(port, arg);
|
break;
|
|
default:
|
err = -ENOIOCTLCMD;
|
}
|
|
return err;
|
}
|
|
static void fwtty_set_termios(struct tty_struct *tty, struct ktermios *old)
|
{
|
struct fwtty_port *port = tty->driver_data;
|
unsigned int baud;
|
|
spin_lock_bh(&port->lock);
|
baud = set_termios(port, tty);
|
|
if ((baud == 0) && (old->c_cflag & CBAUD)) {
|
port->mctrl &= ~(TIOCM_DTR | TIOCM_RTS);
|
} else if ((baud != 0) && !(old->c_cflag & CBAUD)) {
|
if (C_CRTSCTS(tty) || !tty_throttled(tty))
|
port->mctrl |= TIOCM_DTR | TIOCM_RTS;
|
else
|
port->mctrl |= TIOCM_DTR;
|
}
|
__fwtty_write_port_status(port);
|
spin_unlock_bh(&port->lock);
|
|
if (old->c_cflag & CRTSCTS) {
|
if (!C_CRTSCTS(tty)) {
|
tty->hw_stopped = 0;
|
fwtty_restart_tx(port);
|
}
|
} else if (C_CRTSCTS(tty) && ~port->mstatus & TIOCM_CTS) {
|
tty->hw_stopped = 1;
|
}
|
}
|
|
/**
|
* fwtty_break_ctl - start/stop sending breaks
|
*
|
* Signals the remote to start or stop generating simulated breaks.
|
* First, stop dequeueing from the fifo and wait for writer/drain to leave tx
|
* before signalling the break line status. This guarantees any pending rx will
|
* be queued to the line discipline before break is simulated on the remote.
|
* Conversely, turning off break_ctl requires signalling the line status change,
|
* then enabling tx.
|
*/
|
static int fwtty_break_ctl(struct tty_struct *tty, int state)
|
{
|
struct fwtty_port *port = tty->driver_data;
|
long ret;
|
|
fwtty_dbg(port, "%d\n", state);
|
|
if (state == -1) {
|
set_bit(STOP_TX, &port->flags);
|
ret = wait_event_interruptible_timeout(port->wait_tx,
|
!test_bit(IN_TX, &port->flags),
|
10);
|
if (ret == 0 || ret == -ERESTARTSYS) {
|
clear_bit(STOP_TX, &port->flags);
|
fwtty_restart_tx(port);
|
return -EINTR;
|
}
|
}
|
|
spin_lock_bh(&port->lock);
|
port->break_ctl = (state == -1);
|
__fwtty_write_port_status(port);
|
spin_unlock_bh(&port->lock);
|
|
if (state == 0) {
|
spin_lock_bh(&port->lock);
|
dma_fifo_reset(&port->tx_fifo);
|
clear_bit(STOP_TX, &port->flags);
|
spin_unlock_bh(&port->lock);
|
}
|
return 0;
|
}
|
|
static int fwtty_tiocmget(struct tty_struct *tty)
|
{
|
struct fwtty_port *port = tty->driver_data;
|
unsigned int tiocm;
|
|
spin_lock_bh(&port->lock);
|
tiocm = (port->mctrl & MCTRL_MASK) | (port->mstatus & ~MCTRL_MASK);
|
spin_unlock_bh(&port->lock);
|
|
fwtty_dbg(port, "%x\n", tiocm);
|
|
return tiocm;
|
}
|
|
static int fwtty_tiocmset(struct tty_struct *tty,
|
unsigned int set, unsigned int clear)
|
{
|
struct fwtty_port *port = tty->driver_data;
|
|
fwtty_dbg(port, "set: %x clear: %x\n", set, clear);
|
|
/* TODO: simulate loopback if TIOCM_LOOP set */
|
|
spin_lock_bh(&port->lock);
|
port->mctrl &= ~(clear & MCTRL_MASK & 0xffff);
|
port->mctrl |= set & MCTRL_MASK & 0xffff;
|
__fwtty_write_port_status(port);
|
spin_unlock_bh(&port->lock);
|
return 0;
|
}
|
|
static int fwtty_get_icount(struct tty_struct *tty,
|
struct serial_icounter_struct *icount)
|
{
|
struct fwtty_port *port = tty->driver_data;
|
struct stats stats;
|
|
memcpy(&stats, &port->stats, sizeof(stats));
|
if (port->port.console)
|
(*port->fwcon_ops->stats)(&stats, port->con_data);
|
|
icount->cts = port->icount.cts;
|
icount->dsr = port->icount.dsr;
|
icount->rng = port->icount.rng;
|
icount->dcd = port->icount.dcd;
|
icount->rx = port->icount.rx;
|
icount->tx = port->icount.tx + stats.xchars;
|
icount->frame = port->icount.frame;
|
icount->overrun = port->icount.overrun;
|
icount->parity = port->icount.parity;
|
icount->brk = port->icount.brk;
|
icount->buf_overrun = port->icount.overrun;
|
return 0;
|
}
|
|
static void fwtty_proc_show_port(struct seq_file *m, struct fwtty_port *port)
|
{
|
struct stats stats;
|
|
memcpy(&stats, &port->stats, sizeof(stats));
|
if (port->port.console)
|
(*port->fwcon_ops->stats)(&stats, port->con_data);
|
|
seq_printf(m, " addr:%012llx tx:%d rx:%d", port->rx_handler.offset,
|
port->icount.tx + stats.xchars, port->icount.rx);
|
seq_printf(m, " cts:%d dsr:%d rng:%d dcd:%d", port->icount.cts,
|
port->icount.dsr, port->icount.rng, port->icount.dcd);
|
seq_printf(m, " fe:%d oe:%d pe:%d brk:%d", port->icount.frame,
|
port->icount.overrun, port->icount.parity, port->icount.brk);
|
}
|
|
static void fwtty_debugfs_show_port(struct seq_file *m, struct fwtty_port *port)
|
{
|
struct stats stats;
|
|
memcpy(&stats, &port->stats, sizeof(stats));
|
if (port->port.console)
|
(*port->fwcon_ops->stats)(&stats, port->con_data);
|
|
seq_printf(m, " dr:%d st:%d err:%d lost:%d", stats.dropped,
|
stats.tx_stall, stats.fifo_errs, stats.lost);
|
seq_printf(m, " pkts:%d thr:%d", stats.sent, stats.throttled);
|
|
if (port->port.console) {
|
seq_puts(m, "\n ");
|
(*port->fwcon_ops->proc_show)(m, port->con_data);
|
}
|
|
fwtty_dump_profile(m, &port->stats);
|
}
|
|
static void fwtty_debugfs_show_peer(struct seq_file *m, struct fwtty_peer *peer)
|
{
|
int generation = peer->generation;
|
|
smp_rmb();
|
seq_printf(m, " %s:", dev_name(&peer->unit->device));
|
seq_printf(m, " node:%04x gen:%d", peer->node_id, generation);
|
seq_printf(m, " sp:%d max:%d guid:%016llx", peer->speed,
|
peer->max_payload, (unsigned long long)peer->guid);
|
seq_printf(m, " mgmt:%012llx", (unsigned long long)peer->mgmt_addr);
|
seq_printf(m, " addr:%012llx", (unsigned long long)peer->status_addr);
|
seq_putc(m, '\n');
|
}
|
|
static int fwtty_proc_show(struct seq_file *m, void *v)
|
{
|
struct fwtty_port *port;
|
int i;
|
|
seq_puts(m, "fwserinfo: 1.0 driver: 1.0\n");
|
for (i = 0; i < MAX_TOTAL_PORTS && (port = fwtty_port_get(i)); ++i) {
|
seq_printf(m, "%2d:", i);
|
if (capable(CAP_SYS_ADMIN))
|
fwtty_proc_show_port(m, port);
|
fwtty_port_put(port);
|
seq_puts(m, "\n");
|
}
|
return 0;
|
}
|
|
static int fwtty_stats_show(struct seq_file *m, void *v)
|
{
|
struct fw_serial *serial = m->private;
|
struct fwtty_port *port;
|
int i;
|
|
for (i = 0; i < num_ports; ++i) {
|
port = fwtty_port_get(serial->ports[i]->index);
|
if (port) {
|
seq_printf(m, "%2d:", port->index);
|
fwtty_proc_show_port(m, port);
|
fwtty_debugfs_show_port(m, port);
|
fwtty_port_put(port);
|
seq_puts(m, "\n");
|
}
|
}
|
return 0;
|
}
|
DEFINE_SHOW_ATTRIBUTE(fwtty_stats);
|
|
static int fwtty_peers_show(struct seq_file *m, void *v)
|
{
|
struct fw_serial *serial = m->private;
|
struct fwtty_peer *peer;
|
|
rcu_read_lock();
|
seq_printf(m, "card: %s guid: %016llx\n",
|
dev_name(serial->card->device),
|
(unsigned long long)serial->card->guid);
|
list_for_each_entry_rcu(peer, &serial->peer_list, list)
|
fwtty_debugfs_show_peer(m, peer);
|
rcu_read_unlock();
|
return 0;
|
}
|
DEFINE_SHOW_ATTRIBUTE(fwtty_peers);
|
|
static const struct tty_port_operations fwtty_port_ops = {
|
.dtr_rts = fwtty_port_dtr_rts,
|
.carrier_raised = fwtty_port_carrier_raised,
|
.shutdown = fwtty_port_shutdown,
|
.activate = fwtty_port_activate,
|
};
|
|
static const struct tty_operations fwtty_ops = {
|
.open = fwtty_open,
|
.close = fwtty_close,
|
.hangup = fwtty_hangup,
|
.cleanup = fwtty_cleanup,
|
.install = fwtty_install,
|
.write = fwtty_write,
|
.write_room = fwtty_write_room,
|
.chars_in_buffer = fwtty_chars_in_buffer,
|
.send_xchar = fwtty_send_xchar,
|
.throttle = fwtty_throttle,
|
.unthrottle = fwtty_unthrottle,
|
.ioctl = fwtty_ioctl,
|
.set_termios = fwtty_set_termios,
|
.break_ctl = fwtty_break_ctl,
|
.tiocmget = fwtty_tiocmget,
|
.tiocmset = fwtty_tiocmset,
|
.get_icount = fwtty_get_icount,
|
.set_serial = set_serial_info,
|
.get_serial = get_serial_info,
|
.proc_show = fwtty_proc_show,
|
};
|
|
static const struct tty_operations fwloop_ops = {
|
.open = fwtty_open,
|
.close = fwtty_close,
|
.hangup = fwtty_hangup,
|
.cleanup = fwtty_cleanup,
|
.install = fwloop_install,
|
.write = fwtty_write,
|
.write_room = fwtty_write_room,
|
.chars_in_buffer = fwtty_chars_in_buffer,
|
.send_xchar = fwtty_send_xchar,
|
.throttle = fwtty_throttle,
|
.unthrottle = fwtty_unthrottle,
|
.ioctl = fwtty_ioctl,
|
.set_termios = fwtty_set_termios,
|
.break_ctl = fwtty_break_ctl,
|
.tiocmget = fwtty_tiocmget,
|
.tiocmset = fwtty_tiocmset,
|
.get_icount = fwtty_get_icount,
|
.set_serial = set_serial_info,
|
.get_serial = get_serial_info,
|
};
|
|
static inline int mgmt_pkt_expected_len(__be16 code)
|
{
|
static const struct fwserial_mgmt_pkt pkt;
|
|
switch (be16_to_cpu(code)) {
|
case FWSC_VIRT_CABLE_PLUG:
|
return sizeof(pkt.hdr) + sizeof(pkt.plug_req);
|
|
case FWSC_VIRT_CABLE_PLUG_RSP: /* | FWSC_RSP_OK */
|
return sizeof(pkt.hdr) + sizeof(pkt.plug_rsp);
|
|
case FWSC_VIRT_CABLE_UNPLUG:
|
case FWSC_VIRT_CABLE_UNPLUG_RSP:
|
case FWSC_VIRT_CABLE_PLUG_RSP | FWSC_RSP_NACK:
|
case FWSC_VIRT_CABLE_UNPLUG_RSP | FWSC_RSP_NACK:
|
return sizeof(pkt.hdr);
|
|
default:
|
return -1;
|
}
|
}
|
|
static inline void fill_plug_params(struct virt_plug_params *params,
|
struct fwtty_port *port)
|
{
|
u64 status_addr = port->rx_handler.offset;
|
u64 fifo_addr = port->rx_handler.offset + 4;
|
size_t fifo_len = port->rx_handler.length - 4;
|
|
params->status_hi = cpu_to_be32(status_addr >> 32);
|
params->status_lo = cpu_to_be32(status_addr);
|
params->fifo_hi = cpu_to_be32(fifo_addr >> 32);
|
params->fifo_lo = cpu_to_be32(fifo_addr);
|
params->fifo_len = cpu_to_be32(fifo_len);
|
}
|
|
static inline void fill_plug_req(struct fwserial_mgmt_pkt *pkt,
|
struct fwtty_port *port)
|
{
|
pkt->hdr.code = cpu_to_be16(FWSC_VIRT_CABLE_PLUG);
|
pkt->hdr.len = cpu_to_be16(mgmt_pkt_expected_len(pkt->hdr.code));
|
fill_plug_params(&pkt->plug_req, port);
|
}
|
|
static inline void fill_plug_rsp_ok(struct fwserial_mgmt_pkt *pkt,
|
struct fwtty_port *port)
|
{
|
pkt->hdr.code = cpu_to_be16(FWSC_VIRT_CABLE_PLUG_RSP);
|
pkt->hdr.len = cpu_to_be16(mgmt_pkt_expected_len(pkt->hdr.code));
|
fill_plug_params(&pkt->plug_rsp, port);
|
}
|
|
static inline void fill_plug_rsp_nack(struct fwserial_mgmt_pkt *pkt)
|
{
|
pkt->hdr.code = cpu_to_be16(FWSC_VIRT_CABLE_PLUG_RSP | FWSC_RSP_NACK);
|
pkt->hdr.len = cpu_to_be16(mgmt_pkt_expected_len(pkt->hdr.code));
|
}
|
|
static inline void fill_unplug_rsp_nack(struct fwserial_mgmt_pkt *pkt)
|
{
|
pkt->hdr.code = cpu_to_be16(FWSC_VIRT_CABLE_UNPLUG_RSP | FWSC_RSP_NACK);
|
pkt->hdr.len = cpu_to_be16(mgmt_pkt_expected_len(pkt->hdr.code));
|
}
|
|
static inline void fill_unplug_rsp_ok(struct fwserial_mgmt_pkt *pkt)
|
{
|
pkt->hdr.code = cpu_to_be16(FWSC_VIRT_CABLE_UNPLUG_RSP);
|
pkt->hdr.len = cpu_to_be16(mgmt_pkt_expected_len(pkt->hdr.code));
|
}
|
|
static void fwserial_virt_plug_complete(struct fwtty_peer *peer,
|
struct virt_plug_params *params)
|
{
|
struct fwtty_port *port = peer->port;
|
|
peer->status_addr = be32_to_u64(params->status_hi, params->status_lo);
|
peer->fifo_addr = be32_to_u64(params->fifo_hi, params->fifo_lo);
|
peer->fifo_len = be32_to_cpu(params->fifo_len);
|
peer_set_state(peer, FWPS_ATTACHED);
|
|
/* reconfigure tx_fifo optimally for this peer */
|
spin_lock_bh(&port->lock);
|
port->max_payload = min(peer->max_payload, peer->fifo_len);
|
dma_fifo_change_tx_limit(&port->tx_fifo, port->max_payload);
|
spin_unlock_bh(&peer->port->lock);
|
|
if (port->port.console && port->fwcon_ops->notify)
|
(*port->fwcon_ops->notify)(FWCON_NOTIFY_ATTACH, port->con_data);
|
|
fwtty_info(&peer->unit, "peer (guid:%016llx) connected on %s\n",
|
(unsigned long long)peer->guid, dev_name(port->device));
|
}
|
|
static inline int fwserial_send_mgmt_sync(struct fwtty_peer *peer,
|
struct fwserial_mgmt_pkt *pkt)
|
{
|
int generation;
|
int rcode, tries = 5;
|
|
do {
|
generation = peer->generation;
|
smp_rmb();
|
|
rcode = fw_run_transaction(peer->serial->card,
|
TCODE_WRITE_BLOCK_REQUEST,
|
peer->node_id,
|
generation, peer->speed,
|
peer->mgmt_addr,
|
pkt, be16_to_cpu(pkt->hdr.len));
|
if (rcode == RCODE_BUSY || rcode == RCODE_SEND_ERROR ||
|
rcode == RCODE_GENERATION) {
|
fwtty_dbg(&peer->unit, "mgmt write error: %d\n", rcode);
|
continue;
|
} else {
|
break;
|
}
|
} while (--tries > 0);
|
return rcode;
|
}
|
|
/**
|
* fwserial_claim_port - attempt to claim port @ index for peer
|
*
|
* Returns ptr to claimed port or error code (as ERR_PTR())
|
* Can sleep - must be called from process context
|
*/
|
static struct fwtty_port *fwserial_claim_port(struct fwtty_peer *peer,
|
int index)
|
{
|
struct fwtty_port *port;
|
|
if (index < 0 || index >= num_ports)
|
return ERR_PTR(-EINVAL);
|
|
/* must guarantee that previous port releases have completed */
|
synchronize_rcu();
|
|
port = peer->serial->ports[index];
|
spin_lock_bh(&port->lock);
|
if (!rcu_access_pointer(port->peer))
|
rcu_assign_pointer(port->peer, peer);
|
else
|
port = ERR_PTR(-EBUSY);
|
spin_unlock_bh(&port->lock);
|
|
return port;
|
}
|
|
/**
|
* fwserial_find_port - find avail port and claim for peer
|
*
|
* Returns ptr to claimed port or NULL if none avail
|
* Can sleep - must be called from process context
|
*/
|
static struct fwtty_port *fwserial_find_port(struct fwtty_peer *peer)
|
{
|
struct fwtty_port **ports = peer->serial->ports;
|
int i;
|
|
/* must guarantee that previous port releases have completed */
|
synchronize_rcu();
|
|
/* TODO: implement optional GUID-to-specific port # matching */
|
|
/* find an unattached port (but not the loopback port, if present) */
|
for (i = 0; i < num_ttys; ++i) {
|
spin_lock_bh(&ports[i]->lock);
|
if (!ports[i]->peer) {
|
/* claim port */
|
rcu_assign_pointer(ports[i]->peer, peer);
|
spin_unlock_bh(&ports[i]->lock);
|
return ports[i];
|
}
|
spin_unlock_bh(&ports[i]->lock);
|
}
|
return NULL;
|
}
|
|
static void fwserial_release_port(struct fwtty_port *port, bool reset)
|
{
|
/* drop carrier (and all other line status) */
|
if (reset)
|
fwtty_update_port_status(port, 0);
|
|
spin_lock_bh(&port->lock);
|
|
/* reset dma fifo max transmission size back to S100 */
|
port->max_payload = link_speed_to_max_payload(SCODE_100);
|
dma_fifo_change_tx_limit(&port->tx_fifo, port->max_payload);
|
|
RCU_INIT_POINTER(port->peer, NULL);
|
spin_unlock_bh(&port->lock);
|
|
if (port->port.console && port->fwcon_ops->notify)
|
(*port->fwcon_ops->notify)(FWCON_NOTIFY_DETACH, port->con_data);
|
}
|
|
static void fwserial_plug_timeout(struct timer_list *t)
|
{
|
struct fwtty_peer *peer = from_timer(peer, t, timer);
|
struct fwtty_port *port;
|
|
spin_lock_bh(&peer->lock);
|
if (peer->state != FWPS_PLUG_PENDING) {
|
spin_unlock_bh(&peer->lock);
|
return;
|
}
|
|
port = peer_revert_state(peer);
|
spin_unlock_bh(&peer->lock);
|
|
if (port)
|
fwserial_release_port(port, false);
|
}
|
|
/**
|
* fwserial_connect_peer - initiate virtual cable with peer
|
*
|
* Returns 0 if VIRT_CABLE_PLUG request was successfully sent,
|
* otherwise error code. Must be called from process context.
|
*/
|
static int fwserial_connect_peer(struct fwtty_peer *peer)
|
{
|
struct fwtty_port *port;
|
struct fwserial_mgmt_pkt *pkt;
|
int err, rcode;
|
|
pkt = kmalloc(sizeof(*pkt), GFP_KERNEL);
|
if (!pkt)
|
return -ENOMEM;
|
|
port = fwserial_find_port(peer);
|
if (!port) {
|
fwtty_err(&peer->unit, "avail ports in use\n");
|
err = -EBUSY;
|
goto free_pkt;
|
}
|
|
spin_lock_bh(&peer->lock);
|
|
/* only initiate VIRT_CABLE_PLUG if peer is currently not attached */
|
if (peer->state != FWPS_NOT_ATTACHED) {
|
err = -EBUSY;
|
goto release_port;
|
}
|
|
peer->port = port;
|
peer_set_state(peer, FWPS_PLUG_PENDING);
|
|
fill_plug_req(pkt, peer->port);
|
|
mod_timer(&peer->timer, jiffies + VIRT_CABLE_PLUG_TIMEOUT);
|
spin_unlock_bh(&peer->lock);
|
|
rcode = fwserial_send_mgmt_sync(peer, pkt);
|
|
spin_lock_bh(&peer->lock);
|
if (peer->state == FWPS_PLUG_PENDING && rcode != RCODE_COMPLETE) {
|
if (rcode == RCODE_CONFLICT_ERROR)
|
err = -EAGAIN;
|
else
|
err = -EIO;
|
goto cancel_timer;
|
}
|
spin_unlock_bh(&peer->lock);
|
|
kfree(pkt);
|
return 0;
|
|
cancel_timer:
|
del_timer(&peer->timer);
|
peer_revert_state(peer);
|
release_port:
|
spin_unlock_bh(&peer->lock);
|
fwserial_release_port(port, false);
|
free_pkt:
|
kfree(pkt);
|
return err;
|
}
|
|
/**
|
* fwserial_close_port -
|
* HUP the tty (if the tty exists) and unregister the tty device.
|
* Only used by the unit driver upon unit removal to disconnect and
|
* cleanup all attached ports
|
*
|
* The port reference is put by fwtty_cleanup (if a reference was
|
* ever taken).
|
*/
|
static void fwserial_close_port(struct tty_driver *driver,
|
struct fwtty_port *port)
|
{
|
struct tty_struct *tty;
|
|
mutex_lock(&port->port.mutex);
|
tty = tty_port_tty_get(&port->port);
|
if (tty) {
|
tty_vhangup(tty);
|
tty_kref_put(tty);
|
}
|
mutex_unlock(&port->port.mutex);
|
|
if (driver == fwloop_driver)
|
tty_unregister_device(driver, loop_idx(port));
|
else
|
tty_unregister_device(driver, port->index);
|
}
|
|
/**
|
* fwserial_lookup - finds first fw_serial associated with card
|
* @card: fw_card to match
|
*
|
* NB: caller must be holding fwserial_list_mutex
|
*/
|
static struct fw_serial *fwserial_lookup(struct fw_card *card)
|
{
|
struct fw_serial *serial;
|
|
list_for_each_entry(serial, &fwserial_list, list) {
|
if (card == serial->card)
|
return serial;
|
}
|
|
return NULL;
|
}
|
|
/**
|
* __fwserial_lookup_rcu - finds first fw_serial associated with card
|
* @card: fw_card to match
|
*
|
* NB: caller must be inside rcu_read_lock() section
|
*/
|
static struct fw_serial *__fwserial_lookup_rcu(struct fw_card *card)
|
{
|
struct fw_serial *serial;
|
|
list_for_each_entry_rcu(serial, &fwserial_list, list) {
|
if (card == serial->card)
|
return serial;
|
}
|
|
return NULL;
|
}
|
|
/**
|
* __fwserial_peer_by_node_id - finds a peer matching the given generation + id
|
*
|
* If a matching peer could not be found for the specified generation/node id,
|
* this could be because:
|
* a) the generation has changed and one of the nodes hasn't updated yet
|
* b) the remote node has created its remote unit device before this
|
* local node has created its corresponding remote unit device
|
* In either case, the remote node should retry
|
*
|
* Note: caller must be in rcu_read_lock() section
|
*/
|
static struct fwtty_peer *__fwserial_peer_by_node_id(struct fw_card *card,
|
int generation, int id)
|
{
|
struct fw_serial *serial;
|
struct fwtty_peer *peer;
|
|
serial = __fwserial_lookup_rcu(card);
|
if (!serial) {
|
/*
|
* Something is very wrong - there should be a matching
|
* fw_serial structure for every fw_card. Maybe the remote node
|
* has created its remote unit device before this driver has
|
* been probed for any unit devices...
|
*/
|
fwtty_err(card, "unknown card (guid %016llx)\n",
|
(unsigned long long)card->guid);
|
return NULL;
|
}
|
|
list_for_each_entry_rcu(peer, &serial->peer_list, list) {
|
int g = peer->generation;
|
|
smp_rmb();
|
if (generation == g && id == peer->node_id)
|
return peer;
|
}
|
|
return NULL;
|
}
|
|
#ifdef DEBUG
|
static void __dump_peer_list(struct fw_card *card)
|
{
|
struct fw_serial *serial;
|
struct fwtty_peer *peer;
|
|
serial = __fwserial_lookup_rcu(card);
|
if (!serial)
|
return;
|
|
list_for_each_entry_rcu(peer, &serial->peer_list, list) {
|
int g = peer->generation;
|
|
smp_rmb();
|
fwtty_dbg(card, "peer(%d:%x) guid: %016llx\n",
|
g, peer->node_id, (unsigned long long)peer->guid);
|
}
|
}
|
#else
|
#define __dump_peer_list(s)
|
#endif
|
|
static void fwserial_auto_connect(struct work_struct *work)
|
{
|
struct fwtty_peer *peer = to_peer(to_delayed_work(work), connect);
|
int err;
|
|
err = fwserial_connect_peer(peer);
|
if (err == -EAGAIN && ++peer->connect_retries < MAX_CONNECT_RETRIES)
|
schedule_delayed_work(&peer->connect, CONNECT_RETRY_DELAY);
|
}
|
|
static void fwserial_peer_workfn(struct work_struct *work)
|
{
|
struct fwtty_peer *peer = to_peer(work, work);
|
|
peer->workfn(work);
|
}
|
|
/**
|
* fwserial_add_peer - add a newly probed 'serial' unit device as a 'peer'
|
* @serial: aggregate representing the specific fw_card to add the peer to
|
* @unit: 'peer' to create and add to peer_list of serial
|
*
|
* Adds a 'peer' (ie, a local or remote 'serial' unit device) to the list of
|
* peers for a specific fw_card. Optionally, auto-attach this peer to an
|
* available tty port. This function is called either directly or indirectly
|
* as a result of a 'serial' unit device being created & probed.
|
*
|
* Note: this function is serialized with fwserial_remove_peer() by the
|
* fwserial_list_mutex held in fwserial_probe().
|
*
|
* A 1:1 correspondence between an fw_unit and an fwtty_peer is maintained
|
* via the dev_set_drvdata() for the device of the fw_unit.
|
*/
|
static int fwserial_add_peer(struct fw_serial *serial, struct fw_unit *unit)
|
{
|
struct device *dev = &unit->device;
|
struct fw_device *parent = fw_parent_device(unit);
|
struct fwtty_peer *peer;
|
struct fw_csr_iterator ci;
|
int key, val;
|
int generation;
|
|
peer = kzalloc(sizeof(*peer), GFP_KERNEL);
|
if (!peer)
|
return -ENOMEM;
|
|
peer_set_state(peer, FWPS_NOT_ATTACHED);
|
|
dev_set_drvdata(dev, peer);
|
peer->unit = unit;
|
peer->guid = (u64)parent->config_rom[3] << 32 | parent->config_rom[4];
|
peer->speed = parent->max_speed;
|
peer->max_payload = min(device_max_receive(parent),
|
link_speed_to_max_payload(peer->speed));
|
|
generation = parent->generation;
|
smp_rmb();
|
peer->node_id = parent->node_id;
|
smp_wmb();
|
peer->generation = generation;
|
|
/* retrieve the mgmt bus addr from the unit directory */
|
fw_csr_iterator_init(&ci, unit->directory);
|
while (fw_csr_iterator_next(&ci, &key, &val)) {
|
if (key == (CSR_OFFSET | CSR_DEPENDENT_INFO)) {
|
peer->mgmt_addr = CSR_REGISTER_BASE + 4 * val;
|
break;
|
}
|
}
|
if (peer->mgmt_addr == 0ULL) {
|
/*
|
* No mgmt address effectively disables VIRT_CABLE_PLUG -
|
* this peer will not be able to attach to a remote
|
*/
|
peer_set_state(peer, FWPS_NO_MGMT_ADDR);
|
}
|
|
spin_lock_init(&peer->lock);
|
peer->port = NULL;
|
|
timer_setup(&peer->timer, fwserial_plug_timeout, 0);
|
INIT_WORK(&peer->work, fwserial_peer_workfn);
|
INIT_DELAYED_WORK(&peer->connect, fwserial_auto_connect);
|
|
/* associate peer with specific fw_card */
|
peer->serial = serial;
|
list_add_rcu(&peer->list, &serial->peer_list);
|
|
fwtty_info(&peer->unit, "peer added (guid:%016llx)\n",
|
(unsigned long long)peer->guid);
|
|
/* identify the local unit & virt cable to loopback port */
|
if (parent->is_local) {
|
serial->self = peer;
|
if (create_loop_dev) {
|
struct fwtty_port *port;
|
|
port = fwserial_claim_port(peer, num_ttys);
|
if (!IS_ERR(port)) {
|
struct virt_plug_params params;
|
|
spin_lock_bh(&peer->lock);
|
peer->port = port;
|
fill_plug_params(¶ms, port);
|
fwserial_virt_plug_complete(peer, ¶ms);
|
spin_unlock_bh(&peer->lock);
|
|
fwtty_write_port_status(port);
|
}
|
}
|
|
} else if (auto_connect) {
|
/* auto-attach to remote units only (if policy allows) */
|
schedule_delayed_work(&peer->connect, 1);
|
}
|
|
return 0;
|
}
|
|
/**
|
* fwserial_remove_peer - remove a 'serial' unit device as a 'peer'
|
*
|
* Remove a 'peer' from its list of peers. This function is only
|
* called by fwserial_remove() on bus removal of the unit device.
|
*
|
* Note: this function is serialized with fwserial_add_peer() by the
|
* fwserial_list_mutex held in fwserial_remove().
|
*/
|
static void fwserial_remove_peer(struct fwtty_peer *peer)
|
{
|
struct fwtty_port *port;
|
|
spin_lock_bh(&peer->lock);
|
peer_set_state(peer, FWPS_GONE);
|
spin_unlock_bh(&peer->lock);
|
|
cancel_delayed_work_sync(&peer->connect);
|
cancel_work_sync(&peer->work);
|
|
spin_lock_bh(&peer->lock);
|
/* if this unit is the local unit, clear link */
|
if (peer == peer->serial->self)
|
peer->serial->self = NULL;
|
|
/* cancel the request timeout timer (if running) */
|
del_timer(&peer->timer);
|
|
port = peer->port;
|
peer->port = NULL;
|
|
list_del_rcu(&peer->list);
|
|
fwtty_info(&peer->unit, "peer removed (guid:%016llx)\n",
|
(unsigned long long)peer->guid);
|
|
spin_unlock_bh(&peer->lock);
|
|
if (port)
|
fwserial_release_port(port, true);
|
|
synchronize_rcu();
|
kfree(peer);
|
}
|
|
/**
|
* fwserial_create - init everything to create TTYs for a specific fw_card
|
* @unit: fw_unit for first 'serial' unit device probed for this fw_card
|
*
|
* This function inits the aggregate structure (an fw_serial instance)
|
* used to manage the TTY ports registered by a specific fw_card. Also, the
|
* unit device is added as the first 'peer'.
|
*
|
* This unit device may represent a local unit device (as specified by the
|
* config ROM unit directory) or it may represent a remote unit device
|
* (as specified by the reading of the remote node's config ROM).
|
*
|
* Returns 0 to indicate "ownership" of the unit device, or a negative errno
|
* value to indicate which error.
|
*/
|
static int fwserial_create(struct fw_unit *unit)
|
{
|
struct fw_device *parent = fw_parent_device(unit);
|
struct fw_card *card = parent->card;
|
struct fw_serial *serial;
|
struct fwtty_port *port;
|
struct device *tty_dev;
|
int i, j;
|
int err;
|
|
serial = kzalloc(sizeof(*serial), GFP_KERNEL);
|
if (!serial)
|
return -ENOMEM;
|
|
kref_init(&serial->kref);
|
serial->card = card;
|
INIT_LIST_HEAD(&serial->peer_list);
|
|
for (i = 0; i < num_ports; ++i) {
|
port = kzalloc(sizeof(*port), GFP_KERNEL);
|
if (!port) {
|
err = -ENOMEM;
|
goto free_ports;
|
}
|
tty_port_init(&port->port);
|
port->index = FWTTY_INVALID_INDEX;
|
port->port.ops = &fwtty_port_ops;
|
port->serial = serial;
|
tty_buffer_set_limit(&port->port, 128 * 1024);
|
|
spin_lock_init(&port->lock);
|
INIT_DELAYED_WORK(&port->drain, fwtty_drain_tx);
|
INIT_DELAYED_WORK(&port->emit_breaks, fwtty_emit_breaks);
|
INIT_WORK(&port->hangup, fwtty_do_hangup);
|
init_waitqueue_head(&port->wait_tx);
|
port->max_payload = link_speed_to_max_payload(SCODE_100);
|
dma_fifo_init(&port->tx_fifo);
|
|
RCU_INIT_POINTER(port->peer, NULL);
|
serial->ports[i] = port;
|
|
/* get unique bus addr region for port's status & recv fifo */
|
port->rx_handler.length = FWTTY_PORT_RXFIFO_LEN + 4;
|
port->rx_handler.address_callback = fwtty_port_handler;
|
port->rx_handler.callback_data = port;
|
/*
|
* XXX: use custom memory region above cpu physical memory addrs
|
* this will ease porting to 64-bit firewire adapters
|
*/
|
err = fw_core_add_address_handler(&port->rx_handler,
|
&fw_high_memory_region);
|
if (err) {
|
tty_port_destroy(&port->port);
|
kfree(port);
|
goto free_ports;
|
}
|
}
|
/* preserve i for error cleanup */
|
|
err = fwtty_ports_add(serial);
|
if (err) {
|
fwtty_err(&unit, "no space in port table\n");
|
goto free_ports;
|
}
|
|
for (j = 0; j < num_ttys; ++j) {
|
tty_dev = tty_port_register_device(&serial->ports[j]->port,
|
fwtty_driver,
|
serial->ports[j]->index,
|
card->device);
|
if (IS_ERR(tty_dev)) {
|
err = PTR_ERR(tty_dev);
|
fwtty_err(&unit, "register tty device error (%d)\n",
|
err);
|
goto unregister_ttys;
|
}
|
|
serial->ports[j]->device = tty_dev;
|
}
|
/* preserve j for error cleanup */
|
|
if (create_loop_dev) {
|
struct device *loop_dev;
|
|
loop_dev = tty_port_register_device(&serial->ports[j]->port,
|
fwloop_driver,
|
loop_idx(serial->ports[j]),
|
card->device);
|
if (IS_ERR(loop_dev)) {
|
err = PTR_ERR(loop_dev);
|
fwtty_err(&unit, "create loop device failed (%d)\n",
|
err);
|
goto unregister_ttys;
|
}
|
serial->ports[j]->device = loop_dev;
|
serial->ports[j]->loopback = true;
|
}
|
|
if (!IS_ERR_OR_NULL(fwserial_debugfs)) {
|
serial->debugfs = debugfs_create_dir(dev_name(&unit->device),
|
fwserial_debugfs);
|
if (!IS_ERR_OR_NULL(serial->debugfs)) {
|
debugfs_create_file("peers", 0444, serial->debugfs,
|
serial, &fwtty_peers_fops);
|
debugfs_create_file("stats", 0444, serial->debugfs,
|
serial, &fwtty_stats_fops);
|
}
|
}
|
|
list_add_rcu(&serial->list, &fwserial_list);
|
|
fwtty_notice(&unit, "TTY over FireWire on device %s (guid %016llx)\n",
|
dev_name(card->device), (unsigned long long)card->guid);
|
|
err = fwserial_add_peer(serial, unit);
|
if (!err)
|
return 0;
|
|
fwtty_err(&unit, "unable to add peer unit device (%d)\n", err);
|
|
/* fall-through to error processing */
|
debugfs_remove_recursive(serial->debugfs);
|
|
list_del_rcu(&serial->list);
|
if (create_loop_dev)
|
tty_unregister_device(fwloop_driver,
|
loop_idx(serial->ports[j]));
|
unregister_ttys:
|
for (--j; j >= 0; --j)
|
tty_unregister_device(fwtty_driver, serial->ports[j]->index);
|
kref_put(&serial->kref, fwserial_destroy);
|
return err;
|
|
free_ports:
|
for (--i; i >= 0; --i) {
|
fw_core_remove_address_handler(&serial->ports[i]->rx_handler);
|
tty_port_destroy(&serial->ports[i]->port);
|
kfree(serial->ports[i]);
|
}
|
kfree(serial);
|
return err;
|
}
|
|
/**
|
* fwserial_probe: bus probe function for firewire 'serial' unit devices
|
*
|
* A 'serial' unit device is created and probed as a result of:
|
* - declaring a ieee1394 bus id table for 'devices' matching a fabricated
|
* 'serial' unit specifier id
|
* - adding a unit directory to the config ROM(s) for a 'serial' unit
|
*
|
* The firewire core registers unit devices by enumerating unit directories
|
* of a node's config ROM after reading the config ROM when a new node is
|
* added to the bus topology after a bus reset.
|
*
|
* The practical implications of this are:
|
* - this probe is called for both local and remote nodes that have a 'serial'
|
* unit directory in their config ROM (that matches the specifiers in
|
* fwserial_id_table).
|
* - no specific order is enforced for local vs. remote unit devices
|
*
|
* This unit driver copes with the lack of specific order in the same way the
|
* firewire net driver does -- each probe, for either a local or remote unit
|
* device, is treated as a 'peer' (has a struct fwtty_peer instance) and the
|
* first peer created for a given fw_card (tracked by the global fwserial_list)
|
* creates the underlying TTYs (aggregated in a fw_serial instance).
|
*
|
* NB: an early attempt to differentiate local & remote unit devices by creating
|
* peers only for remote units and fw_serial instances (with their
|
* associated TTY devices) only for local units was discarded. Managing
|
* the peer lifetimes on device removal proved too complicated.
|
*
|
* fwserial_probe/fwserial_remove are effectively serialized by the
|
* fwserial_list_mutex. This is necessary because the addition of the first peer
|
* for a given fw_card will trigger the creation of the fw_serial for that
|
* fw_card, which must not simultaneously contend with the removal of the
|
* last peer for a given fw_card triggering the destruction of the same
|
* fw_serial for the same fw_card.
|
*/
|
static int fwserial_probe(struct fw_unit *unit,
|
const struct ieee1394_device_id *id)
|
{
|
struct fw_serial *serial;
|
int err;
|
|
mutex_lock(&fwserial_list_mutex);
|
serial = fwserial_lookup(fw_parent_device(unit)->card);
|
if (!serial)
|
err = fwserial_create(unit);
|
else
|
err = fwserial_add_peer(serial, unit);
|
mutex_unlock(&fwserial_list_mutex);
|
return err;
|
}
|
|
/**
|
* fwserial_remove: bus removal function for firewire 'serial' unit devices
|
*
|
* The corresponding 'peer' for this unit device is removed from the list of
|
* peers for the associated fw_serial (which has a 1:1 correspondence with a
|
* specific fw_card). If this is the last peer being removed, then trigger
|
* the destruction of the underlying TTYs.
|
*/
|
static void fwserial_remove(struct fw_unit *unit)
|
{
|
struct fwtty_peer *peer = dev_get_drvdata(&unit->device);
|
struct fw_serial *serial = peer->serial;
|
int i;
|
|
mutex_lock(&fwserial_list_mutex);
|
fwserial_remove_peer(peer);
|
|
if (list_empty(&serial->peer_list)) {
|
/* unlink from the fwserial_list here */
|
list_del_rcu(&serial->list);
|
|
debugfs_remove_recursive(serial->debugfs);
|
|
for (i = 0; i < num_ttys; ++i)
|
fwserial_close_port(fwtty_driver, serial->ports[i]);
|
if (create_loop_dev)
|
fwserial_close_port(fwloop_driver, serial->ports[i]);
|
kref_put(&serial->kref, fwserial_destroy);
|
}
|
mutex_unlock(&fwserial_list_mutex);
|
}
|
|
/**
|
* fwserial_update: bus update function for 'firewire' serial unit devices
|
*
|
* Updates the new node_id and bus generation for this peer. Note that locking
|
* is unnecessary; but careful memory barrier usage is important to enforce the
|
* load and store order of generation & node_id.
|
*
|
* The fw-core orders the write of node_id before generation in the parent
|
* fw_device to ensure that a stale node_id cannot be used with a current
|
* bus generation. So the generation value must be read before the node_id.
|
*
|
* In turn, this orders the write of node_id before generation in the peer to
|
* also ensure a stale node_id cannot be used with a current bus generation.
|
*/
|
static void fwserial_update(struct fw_unit *unit)
|
{
|
struct fw_device *parent = fw_parent_device(unit);
|
struct fwtty_peer *peer = dev_get_drvdata(&unit->device);
|
int generation;
|
|
generation = parent->generation;
|
smp_rmb();
|
peer->node_id = parent->node_id;
|
smp_wmb();
|
peer->generation = generation;
|
}
|
|
static const struct ieee1394_device_id fwserial_id_table[] = {
|
{
|
.match_flags = IEEE1394_MATCH_SPECIFIER_ID |
|
IEEE1394_MATCH_VERSION,
|
.specifier_id = LINUX_VENDOR_ID,
|
.version = FWSERIAL_VERSION,
|
},
|
{ }
|
};
|
|
static struct fw_driver fwserial_driver = {
|
.driver = {
|
.owner = THIS_MODULE,
|
.name = KBUILD_MODNAME,
|
.bus = &fw_bus_type,
|
},
|
.probe = fwserial_probe,
|
.update = fwserial_update,
|
.remove = fwserial_remove,
|
.id_table = fwserial_id_table,
|
};
|
|
#define FW_UNIT_SPECIFIER(id) ((CSR_SPECIFIER_ID << 24) | (id))
|
#define FW_UNIT_VERSION(ver) ((CSR_VERSION << 24) | (ver))
|
#define FW_UNIT_ADDRESS(ofs) (((CSR_OFFSET | CSR_DEPENDENT_INFO) << 24) \
|
| (((ofs) - CSR_REGISTER_BASE) >> 2))
|
/* XXX: config ROM definitons could be improved with semi-automated offset
|
* and length calculation
|
*/
|
#define FW_ROM_LEN(quads) ((quads) << 16)
|
#define FW_ROM_DESCRIPTOR(ofs) (((CSR_LEAF | CSR_DESCRIPTOR) << 24) | (ofs))
|
|
struct fwserial_unit_directory_data {
|
u32 len_crc;
|
u32 unit_specifier;
|
u32 unit_sw_version;
|
u32 unit_addr_offset;
|
u32 desc1_ofs;
|
u32 desc1_len_crc;
|
u32 desc1_data[5];
|
} __packed;
|
|
static struct fwserial_unit_directory_data fwserial_unit_directory_data = {
|
.len_crc = FW_ROM_LEN(4),
|
.unit_specifier = FW_UNIT_SPECIFIER(LINUX_VENDOR_ID),
|
.unit_sw_version = FW_UNIT_VERSION(FWSERIAL_VERSION),
|
.desc1_ofs = FW_ROM_DESCRIPTOR(1),
|
.desc1_len_crc = FW_ROM_LEN(5),
|
.desc1_data = {
|
0x00000000, /* type = text */
|
0x00000000, /* enc = ASCII, lang EN */
|
0x4c696e75, /* 'Linux TTY' */
|
0x78205454,
|
0x59000000,
|
},
|
};
|
|
static struct fw_descriptor fwserial_unit_directory = {
|
.length = sizeof(fwserial_unit_directory_data) / sizeof(u32),
|
.key = (CSR_DIRECTORY | CSR_UNIT) << 24,
|
.data = (u32 *)&fwserial_unit_directory_data,
|
};
|
|
/*
|
* The management address is in the unit space region but above other known
|
* address users (to keep wild writes from causing havoc)
|
*/
|
static const struct fw_address_region fwserial_mgmt_addr_region = {
|
.start = CSR_REGISTER_BASE + 0x1e0000ULL,
|
.end = 0x1000000000000ULL,
|
};
|
|
static struct fw_address_handler fwserial_mgmt_addr_handler;
|
|
/**
|
* fwserial_handle_plug_req - handle VIRT_CABLE_PLUG request work
|
* @work: ptr to peer->work
|
*
|
* Attempts to complete the VIRT_CABLE_PLUG handshake sequence for this peer.
|
*
|
* This checks for a collided request-- ie, that a VIRT_CABLE_PLUG request was
|
* already sent to this peer. If so, the collision is resolved by comparing
|
* guid values; the loser sends the plug response.
|
*
|
* Note: if an error prevents a response, don't do anything -- the
|
* remote will timeout its request.
|
*/
|
static void fwserial_handle_plug_req(struct work_struct *work)
|
{
|
struct fwtty_peer *peer = to_peer(work, work);
|
struct virt_plug_params *plug_req = &peer->work_params.plug_req;
|
struct fwtty_port *port;
|
struct fwserial_mgmt_pkt *pkt;
|
int rcode;
|
|
pkt = kmalloc(sizeof(*pkt), GFP_KERNEL);
|
if (!pkt)
|
return;
|
|
port = fwserial_find_port(peer);
|
|
spin_lock_bh(&peer->lock);
|
|
switch (peer->state) {
|
case FWPS_NOT_ATTACHED:
|
if (!port) {
|
fwtty_err(&peer->unit, "no more ports avail\n");
|
fill_plug_rsp_nack(pkt);
|
} else {
|
peer->port = port;
|
fill_plug_rsp_ok(pkt, peer->port);
|
peer_set_state(peer, FWPS_PLUG_RESPONDING);
|
/* don't release claimed port */
|
port = NULL;
|
}
|
break;
|
|
case FWPS_PLUG_PENDING:
|
if (peer->serial->card->guid > peer->guid)
|
goto cleanup;
|
|
/* We lost - hijack the already-claimed port and send ok */
|
del_timer(&peer->timer);
|
fill_plug_rsp_ok(pkt, peer->port);
|
peer_set_state(peer, FWPS_PLUG_RESPONDING);
|
break;
|
|
default:
|
fill_plug_rsp_nack(pkt);
|
}
|
|
spin_unlock_bh(&peer->lock);
|
if (port)
|
fwserial_release_port(port, false);
|
|
rcode = fwserial_send_mgmt_sync(peer, pkt);
|
|
spin_lock_bh(&peer->lock);
|
if (peer->state == FWPS_PLUG_RESPONDING) {
|
if (rcode == RCODE_COMPLETE) {
|
struct fwtty_port *tmp = peer->port;
|
|
fwserial_virt_plug_complete(peer, plug_req);
|
spin_unlock_bh(&peer->lock);
|
|
fwtty_write_port_status(tmp);
|
spin_lock_bh(&peer->lock);
|
} else {
|
fwtty_err(&peer->unit, "PLUG_RSP error (%d)\n", rcode);
|
port = peer_revert_state(peer);
|
}
|
}
|
cleanup:
|
spin_unlock_bh(&peer->lock);
|
if (port)
|
fwserial_release_port(port, false);
|
kfree(pkt);
|
}
|
|
static void fwserial_handle_unplug_req(struct work_struct *work)
|
{
|
struct fwtty_peer *peer = to_peer(work, work);
|
struct fwtty_port *port = NULL;
|
struct fwserial_mgmt_pkt *pkt;
|
int rcode;
|
|
pkt = kmalloc(sizeof(*pkt), GFP_KERNEL);
|
if (!pkt)
|
return;
|
|
spin_lock_bh(&peer->lock);
|
|
switch (peer->state) {
|
case FWPS_ATTACHED:
|
fill_unplug_rsp_ok(pkt);
|
peer_set_state(peer, FWPS_UNPLUG_RESPONDING);
|
break;
|
|
case FWPS_UNPLUG_PENDING:
|
if (peer->serial->card->guid > peer->guid)
|
goto cleanup;
|
|
/* We lost - send unplug rsp */
|
del_timer(&peer->timer);
|
fill_unplug_rsp_ok(pkt);
|
peer_set_state(peer, FWPS_UNPLUG_RESPONDING);
|
break;
|
|
default:
|
fill_unplug_rsp_nack(pkt);
|
}
|
|
spin_unlock_bh(&peer->lock);
|
|
rcode = fwserial_send_mgmt_sync(peer, pkt);
|
|
spin_lock_bh(&peer->lock);
|
if (peer->state == FWPS_UNPLUG_RESPONDING) {
|
if (rcode != RCODE_COMPLETE)
|
fwtty_err(&peer->unit, "UNPLUG_RSP error (%d)\n",
|
rcode);
|
port = peer_revert_state(peer);
|
}
|
cleanup:
|
spin_unlock_bh(&peer->lock);
|
if (port)
|
fwserial_release_port(port, true);
|
kfree(pkt);
|
}
|
|
static int fwserial_parse_mgmt_write(struct fwtty_peer *peer,
|
struct fwserial_mgmt_pkt *pkt,
|
unsigned long long addr,
|
size_t len)
|
{
|
struct fwtty_port *port = NULL;
|
bool reset = false;
|
int rcode;
|
|
if (addr != fwserial_mgmt_addr_handler.offset || len < sizeof(pkt->hdr))
|
return RCODE_ADDRESS_ERROR;
|
|
if (len != be16_to_cpu(pkt->hdr.len) ||
|
len != mgmt_pkt_expected_len(pkt->hdr.code))
|
return RCODE_DATA_ERROR;
|
|
spin_lock_bh(&peer->lock);
|
if (peer->state == FWPS_GONE) {
|
/*
|
* This should never happen - it would mean that the
|
* remote unit that just wrote this transaction was
|
* already removed from the bus -- and the removal was
|
* processed before we rec'd this transaction
|
*/
|
fwtty_err(&peer->unit, "peer already removed\n");
|
spin_unlock_bh(&peer->lock);
|
return RCODE_ADDRESS_ERROR;
|
}
|
|
rcode = RCODE_COMPLETE;
|
|
fwtty_dbg(&peer->unit, "mgmt: hdr.code: %04hx\n", pkt->hdr.code);
|
|
switch (be16_to_cpu(pkt->hdr.code) & FWSC_CODE_MASK) {
|
case FWSC_VIRT_CABLE_PLUG:
|
if (work_pending(&peer->work)) {
|
fwtty_err(&peer->unit, "plug req: busy\n");
|
rcode = RCODE_CONFLICT_ERROR;
|
|
} else {
|
peer->work_params.plug_req = pkt->plug_req;
|
peer->workfn = fwserial_handle_plug_req;
|
queue_work(system_unbound_wq, &peer->work);
|
}
|
break;
|
|
case FWSC_VIRT_CABLE_PLUG_RSP:
|
if (peer->state != FWPS_PLUG_PENDING) {
|
rcode = RCODE_CONFLICT_ERROR;
|
|
} else if (be16_to_cpu(pkt->hdr.code) & FWSC_RSP_NACK) {
|
fwtty_notice(&peer->unit, "NACK plug rsp\n");
|
port = peer_revert_state(peer);
|
|
} else {
|
struct fwtty_port *tmp = peer->port;
|
|
fwserial_virt_plug_complete(peer, &pkt->plug_rsp);
|
spin_unlock_bh(&peer->lock);
|
|
fwtty_write_port_status(tmp);
|
spin_lock_bh(&peer->lock);
|
}
|
break;
|
|
case FWSC_VIRT_CABLE_UNPLUG:
|
if (work_pending(&peer->work)) {
|
fwtty_err(&peer->unit, "unplug req: busy\n");
|
rcode = RCODE_CONFLICT_ERROR;
|
} else {
|
peer->workfn = fwserial_handle_unplug_req;
|
queue_work(system_unbound_wq, &peer->work);
|
}
|
break;
|
|
case FWSC_VIRT_CABLE_UNPLUG_RSP:
|
if (peer->state != FWPS_UNPLUG_PENDING) {
|
rcode = RCODE_CONFLICT_ERROR;
|
} else {
|
if (be16_to_cpu(pkt->hdr.code) & FWSC_RSP_NACK)
|
fwtty_notice(&peer->unit, "NACK unplug?\n");
|
port = peer_revert_state(peer);
|
reset = true;
|
}
|
break;
|
|
default:
|
fwtty_err(&peer->unit, "unknown mgmt code %d\n",
|
be16_to_cpu(pkt->hdr.code));
|
rcode = RCODE_DATA_ERROR;
|
}
|
spin_unlock_bh(&peer->lock);
|
|
if (port)
|
fwserial_release_port(port, reset);
|
|
return rcode;
|
}
|
|
/**
|
* fwserial_mgmt_handler: bus address handler for mgmt requests
|
* @parameters: fw_address_callback_t as specified by firewire core interface
|
*
|
* This handler is responsible for handling virtual cable requests from remotes
|
* for all cards.
|
*/
|
static void fwserial_mgmt_handler(struct fw_card *card,
|
struct fw_request *request,
|
int tcode, int destination, int source,
|
int generation,
|
unsigned long long addr,
|
void *data, size_t len,
|
void *callback_data)
|
{
|
struct fwserial_mgmt_pkt *pkt = data;
|
struct fwtty_peer *peer;
|
int rcode;
|
|
rcu_read_lock();
|
peer = __fwserial_peer_by_node_id(card, generation, source);
|
if (!peer) {
|
fwtty_dbg(card, "peer(%d:%x) not found\n", generation, source);
|
__dump_peer_list(card);
|
rcode = RCODE_CONFLICT_ERROR;
|
|
} else {
|
switch (tcode) {
|
case TCODE_WRITE_BLOCK_REQUEST:
|
rcode = fwserial_parse_mgmt_write(peer, pkt, addr, len);
|
break;
|
|
default:
|
rcode = RCODE_TYPE_ERROR;
|
}
|
}
|
|
rcu_read_unlock();
|
fw_send_response(card, request, rcode);
|
}
|
|
static int __init fwserial_init(void)
|
{
|
int err, num_loops = !!(create_loop_dev);
|
|
/* XXX: placeholder for a "firewire" debugfs node */
|
fwserial_debugfs = debugfs_create_dir(KBUILD_MODNAME, NULL);
|
|
/* num_ttys/num_ports must not be set above the static alloc avail */
|
if (num_ttys + num_loops > MAX_CARD_PORTS)
|
num_ttys = MAX_CARD_PORTS - num_loops;
|
|
num_ports = num_ttys + num_loops;
|
|
fwtty_driver = tty_alloc_driver(MAX_TOTAL_PORTS, TTY_DRIVER_REAL_RAW
|
| TTY_DRIVER_DYNAMIC_DEV);
|
if (IS_ERR(fwtty_driver)) {
|
err = PTR_ERR(fwtty_driver);
|
goto remove_debugfs;
|
}
|
|
fwtty_driver->driver_name = KBUILD_MODNAME;
|
fwtty_driver->name = tty_dev_name;
|
fwtty_driver->major = 0;
|
fwtty_driver->minor_start = 0;
|
fwtty_driver->type = TTY_DRIVER_TYPE_SERIAL;
|
fwtty_driver->subtype = SERIAL_TYPE_NORMAL;
|
fwtty_driver->init_termios = tty_std_termios;
|
fwtty_driver->init_termios.c_cflag |= CLOCAL;
|
tty_set_operations(fwtty_driver, &fwtty_ops);
|
|
err = tty_register_driver(fwtty_driver);
|
if (err) {
|
pr_err("register tty driver failed (%d)\n", err);
|
goto put_tty;
|
}
|
|
if (create_loop_dev) {
|
fwloop_driver = tty_alloc_driver(MAX_TOTAL_PORTS / num_ports,
|
TTY_DRIVER_REAL_RAW
|
| TTY_DRIVER_DYNAMIC_DEV);
|
if (IS_ERR(fwloop_driver)) {
|
err = PTR_ERR(fwloop_driver);
|
goto unregister_driver;
|
}
|
|
fwloop_driver->driver_name = KBUILD_MODNAME "_loop";
|
fwloop_driver->name = loop_dev_name;
|
fwloop_driver->major = 0;
|
fwloop_driver->minor_start = 0;
|
fwloop_driver->type = TTY_DRIVER_TYPE_SERIAL;
|
fwloop_driver->subtype = SERIAL_TYPE_NORMAL;
|
fwloop_driver->init_termios = tty_std_termios;
|
fwloop_driver->init_termios.c_cflag |= CLOCAL;
|
tty_set_operations(fwloop_driver, &fwloop_ops);
|
|
err = tty_register_driver(fwloop_driver);
|
if (err) {
|
pr_err("register loop driver failed (%d)\n", err);
|
goto put_loop;
|
}
|
}
|
|
fwtty_txn_cache = kmem_cache_create("fwtty_txn_cache",
|
sizeof(struct fwtty_transaction),
|
0, 0, NULL);
|
if (!fwtty_txn_cache) {
|
err = -ENOMEM;
|
goto unregister_loop;
|
}
|
|
/*
|
* Ideally, this address handler would be registered per local node
|
* (rather than the same handler for all local nodes). However,
|
* since the firewire core requires the config rom descriptor *before*
|
* the local unit device(s) are created, a single management handler
|
* must suffice for all local serial units.
|
*/
|
fwserial_mgmt_addr_handler.length = sizeof(struct fwserial_mgmt_pkt);
|
fwserial_mgmt_addr_handler.address_callback = fwserial_mgmt_handler;
|
|
err = fw_core_add_address_handler(&fwserial_mgmt_addr_handler,
|
&fwserial_mgmt_addr_region);
|
if (err) {
|
pr_err("add management handler failed (%d)\n", err);
|
goto destroy_cache;
|
}
|
|
fwserial_unit_directory_data.unit_addr_offset =
|
FW_UNIT_ADDRESS(fwserial_mgmt_addr_handler.offset);
|
err = fw_core_add_descriptor(&fwserial_unit_directory);
|
if (err) {
|
pr_err("add unit descriptor failed (%d)\n", err);
|
goto remove_handler;
|
}
|
|
err = driver_register(&fwserial_driver.driver);
|
if (err) {
|
pr_err("register fwserial driver failed (%d)\n", err);
|
goto remove_descriptor;
|
}
|
|
return 0;
|
|
remove_descriptor:
|
fw_core_remove_descriptor(&fwserial_unit_directory);
|
remove_handler:
|
fw_core_remove_address_handler(&fwserial_mgmt_addr_handler);
|
destroy_cache:
|
kmem_cache_destroy(fwtty_txn_cache);
|
unregister_loop:
|
if (create_loop_dev)
|
tty_unregister_driver(fwloop_driver);
|
put_loop:
|
if (create_loop_dev)
|
put_tty_driver(fwloop_driver);
|
unregister_driver:
|
tty_unregister_driver(fwtty_driver);
|
put_tty:
|
put_tty_driver(fwtty_driver);
|
remove_debugfs:
|
debugfs_remove_recursive(fwserial_debugfs);
|
|
return err;
|
}
|
|
static void __exit fwserial_exit(void)
|
{
|
driver_unregister(&fwserial_driver.driver);
|
fw_core_remove_descriptor(&fwserial_unit_directory);
|
fw_core_remove_address_handler(&fwserial_mgmt_addr_handler);
|
kmem_cache_destroy(fwtty_txn_cache);
|
if (create_loop_dev) {
|
tty_unregister_driver(fwloop_driver);
|
put_tty_driver(fwloop_driver);
|
}
|
tty_unregister_driver(fwtty_driver);
|
put_tty_driver(fwtty_driver);
|
debugfs_remove_recursive(fwserial_debugfs);
|
}
|
|
module_init(fwserial_init);
|
module_exit(fwserial_exit);
|
|
MODULE_AUTHOR("Peter Hurley (peter@hurleysoftware.com)");
|
MODULE_DESCRIPTION("FireWire Serial TTY Driver");
|
MODULE_LICENSE("GPL");
|
MODULE_DEVICE_TABLE(ieee1394, fwserial_id_table);
|
MODULE_PARM_DESC(ttys, "Number of ttys to create for each local firewire node");
|
MODULE_PARM_DESC(auto, "Auto-connect a tty to each firewire node discovered");
|
MODULE_PARM_DESC(loop, "Create a loopback device, fwloop<n>, with ttys");
|
