2015-07-26 23:59:55 -06:00
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/*
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2017-02-15 01:46:29 -07:00
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* Copyright (C) 2015-2016 Freescale Semiconductor, Inc.
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* Copyright (C) 2017 NXP
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2015-07-26 23:59:55 -06:00
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*
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* derived from the omap-rpmsg implementation.
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* Remote processor messaging transport - tty driver
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*
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* The code contained herein is licensed under the GNU General Public
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* License. You may obtain a copy of the GNU General Public License
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* Version 2 or later at the following locations:
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*
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* http://www.opensource.org/licenses/gpl-license.html
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* http://www.gnu.org/copyleft/gpl.html
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*/
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#include <linux/delay.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/rpmsg.h>
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#include <linux/tty.h>
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#include <linux/tty_driver.h>
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#include <linux/tty_flip.h>
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#include <linux/virtio.h>
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2017-10-17 00:23:40 -06:00
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/* this needs to be less then (RPMSG_BUF_SIZE - sizeof(struct rpmsg_hdr)) */
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#define RPMSG_MAX_SIZE 256
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#define MSG "hello world!"
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2015-07-26 23:59:55 -06:00
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/*
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* struct rpmsgtty_port - Wrapper struct for imx rpmsg tty port.
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* @port: TTY port data
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*/
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struct rpmsgtty_port {
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struct tty_port port;
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spinlock_t rx_lock;
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struct rpmsg_device *rpdev;
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2017-10-17 00:23:40 -06:00
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struct tty_driver *rpmsgtty_driver;
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2015-07-26 23:59:55 -06:00
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};
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static int rpmsg_tty_cb(struct rpmsg_device *rpdev, void *data, int len,
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void *priv, u32 src)
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{
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int space;
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unsigned char *cbuf;
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2017-10-17 00:23:40 -06:00
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struct rpmsgtty_port *cport = dev_get_drvdata(&rpdev->dev);
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2015-07-26 23:59:55 -06:00
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/* flush the recv-ed none-zero data to tty node */
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if (len == 0)
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return 0;
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dev_dbg(&rpdev->dev, "msg(<- src 0x%x) len %d\n", src, len);
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print_hex_dump(KERN_DEBUG, __func__, DUMP_PREFIX_NONE, 16, 1,
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data, len, true);
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spin_lock_bh(&cport->rx_lock);
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space = tty_prepare_flip_string(&cport->port, &cbuf, len);
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if (space <= 0) {
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dev_err(&rpdev->dev, "No memory for tty_prepare_flip_string\n");
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spin_unlock_bh(&cport->rx_lock);
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return -ENOMEM;
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}
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memcpy(cbuf, data, len);
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tty_flip_buffer_push(&cport->port);
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spin_unlock_bh(&cport->rx_lock);
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return 0;
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}
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static struct tty_port_operations rpmsgtty_port_ops = { };
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static int rpmsgtty_install(struct tty_driver *driver, struct tty_struct *tty)
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{
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2017-10-17 00:23:40 -06:00
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struct rpmsgtty_port *cport = driver->driver_state;
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return tty_port_install(&cport->port, driver, tty);
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2015-07-26 23:59:55 -06:00
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}
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static int rpmsgtty_open(struct tty_struct *tty, struct file *filp)
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{
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return tty_port_open(tty->port, tty, filp);
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}
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static void rpmsgtty_close(struct tty_struct *tty, struct file *filp)
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{
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return tty_port_close(tty->port, tty, filp);
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}
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static int rpmsgtty_write(struct tty_struct *tty, const unsigned char *buf,
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int total)
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{
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int count, ret = 0;
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const unsigned char *tbuf;
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struct rpmsgtty_port *rptty_port = container_of(tty->port,
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struct rpmsgtty_port, port);
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struct rpmsg_device *rpdev = rptty_port->rpdev;
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if (NULL == buf) {
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pr_err("buf shouldn't be null.\n");
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return -ENOMEM;
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}
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count = total;
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tbuf = buf;
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do {
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/* send a message to our remote processor */
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ret = rpmsg_send(rpdev->ept, (void *)tbuf,
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count > RPMSG_MAX_SIZE ? RPMSG_MAX_SIZE : count);
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if (ret) {
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dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
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return ret;
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}
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if (count > RPMSG_MAX_SIZE) {
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count -= RPMSG_MAX_SIZE;
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tbuf += RPMSG_MAX_SIZE;
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} else {
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count = 0;
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}
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} while (count > 0);
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return total;
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}
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static int rpmsgtty_write_room(struct tty_struct *tty)
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{
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/* report the space in the rpmsg buffer */
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return RPMSG_MAX_SIZE;
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}
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static const struct tty_operations imxrpmsgtty_ops = {
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.install = rpmsgtty_install,
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.open = rpmsgtty_open,
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.close = rpmsgtty_close,
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.write = rpmsgtty_write,
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.write_room = rpmsgtty_write_room,
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};
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static int rpmsg_tty_probe(struct rpmsg_device *rpdev)
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{
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2017-10-17 00:23:40 -06:00
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int ret;
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struct rpmsgtty_port *cport;
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struct tty_driver *rpmsgtty_driver;
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2015-07-26 23:59:55 -06:00
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dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n",
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rpdev->src, rpdev->dst);
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2017-10-17 00:23:40 -06:00
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cport = devm_kzalloc(&rpdev->dev, sizeof(*cport), GFP_KERNEL);
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if (!cport)
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return -ENOMEM;
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2015-08-17 18:34:15 -06:00
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2015-07-26 23:59:55 -06:00
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rpmsgtty_driver = tty_alloc_driver(1, TTY_DRIVER_UNNUMBERED_NODE);
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2017-10-17 00:23:40 -06:00
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if (IS_ERR(rpmsgtty_driver)) {
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kfree(cport);
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2015-07-26 23:59:55 -06:00
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return PTR_ERR(rpmsgtty_driver);
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2017-10-17 00:23:40 -06:00
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}
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2015-07-26 23:59:55 -06:00
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rpmsgtty_driver->driver_name = "rpmsg_tty";
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MLK-19864 rpmsg: imx: fix the kernel panic during tty rpmsg demo
Fix the kernel panic during tty rpmsg str echo demo.
Root cause: The driver name may be flushed.
Use the kasprintf to setup the rpmsg tty driver name to
fix this issue.
[ 35.494361] Unable to handle kernel paging request at virtual address
ffff000021b4ba40
[ 35.502321] Mem abort info:
[ 35.505117] Exception class = DABT (current EL), IL = 32 bits
[ 35.511099] SET = 0, FnV = 0
[ 35.514188] EA = 0, S1PTW = 0
[ 35.517328] Data abort info:
[ 35.520255] ISV = 0, ISS = 0x00000007
[ 35.524130] CM = 0, WnR = 0
[ 35.527140] swapper pgtable: 4k pages, 48-bit VAs, pgd =
ffff0000096dd000
[ 35.533964] [ffff000021b4ba40] *pgd=000000097fffe803,
*pud=000000097fffd803, *pmd=0000000973d20003, *pte=0000000000000000
[ 35.544976] Internal error: Oops: 96000007 [#1] PREEMPT SMP
[ 35.550553] Modules linked in: imx_rpmsg_tty
[ 35.554843] CPU: 2 PID: 3911 Comm: sh Not tainted
4.14.62-05098-gcff652e-dirty #41
[ 35.562419] Hardware name: Freescale i.MX8QM MEK (DT)
[ 35.567479] task: ffff8008f3950000 task.stack: ffff000021b10000
[ 35.573413] PC is at string+0x28/0x98
[ 35.577080] LR is at vsnprintf+0x3c0/0x688
[ 35.581177] pc : [<ffff000008d5f1a0>] lr : [<ffff000008d61c70>]
pstate: a0000145
[ 35.588577] sp : ffff000021b13970
[ 35.591894] x29: ffff000021b13970 x28: ffff80097365f56f
[ 35.597219] x27: ffff0000092cf03a x26: ffff0000092cf03a
[ 35.602544] x25: ffff000021b13a80 x24: ffff8008f365f570
[ 35.607869] x23: 00000000ffffffd8 x22: ffff000008fc08dc
[ 35.613195] x21: 000000007fffffff x20: ffff000008fc08cc
[ 35.618512] x19: ffff8008f365f570 x18: 0000000000000000
[ 35.623827] x17: 0000ffffbec93588 x16: ffff00000820b2c0
[ 35.629144] x15: 0000000000000000 x14: ffffffffffffffff
[ 35.634461] x13: 0000000000000018 x12: 0101010101010101
[ 35.639777] x11: 0000000000000000 x10: ffff000021b13a80
[ 35.645085] x9 : ffff000021b13a80 x8 : ffff000021b13a80
[ 35.650402] x7 : ffff8008f365f570 x6 : fffffffffffffffe
[ 35.655718] x5 : 00000000ffffffd0 x4 : ffff000021b4ba40
[ 35.661035] x3 : ffff0a00ffffff04 x2 : ffff80097365f56f
[ 35.666354] x1 : ffff80097365f56f x0 : ffffffffffffffff
[ 35.671672] Process sh (pid: 3911, stack limit = 0xffff000021b10000)
[ 35.678022] Call trace:
[ 35.680465] Exception stack(0xffff000021b13830 to 0xffff000021b13970)
[ 35.686911] 3820: ffffffffffffffff
ffff80097365f56f
[ 35.694748] 3840: ffff80097365f56f ffff0a00ffffff04 ffff000021b4ba40
00000000ffffffd0
[ 35.702581] 3860: fffffffffffffffe ffff8008f365f570 ffff000021b13a80
ffff000021b13a80
[ 35.710409] 3880: ffff000021b13a80 0000000000000000 0101010101010101
0000000000000018
[ 35.718245] 38a0: ffffffffffffffff 0000000000000000 ffff00000820b2c0
0000ffffbec93588
[ 35.726081] 38c0: 0000000000000000 ffff8008f365f570 ffff000008fc08cc
000000007fffffff
[ 35.733908] 38e0: ffff000008fc08dc 00000000ffffffd8 ffff8008f365f570
ffff000021b13a80
[ 35.741744] 3900: ffff0000092cf03a ffff0000092cf03a ffff80097365f56f
ffff000021b13970
[ 35.749583] 3920: ffff000008d61c70 ffff000021b13970 ffff000008d5f1a0
00000000a0000145
[ 35.757417] 3940: ffff8008fff5fb00 0000000000001c00 0000ffffffffffff
ffff000008d61930
[ 35.765254] 3960: ffff000021b13970 ffff000008d5f1a0
[ 35.770129] [<ffff000008d5f1a0>] string+0x28/0x98
[ 35.774837] [<ffff000008d61c70>] vsnprintf+0x3c0/0x688
[ 35.779980] [<ffff000008d620e4>] sprintf+0x4c/0x58
Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
Reviewed-by: Fugang Duan <fugang.duan@nxp.com>
2018-10-10 00:41:03 -06:00
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rpmsgtty_driver->name = kasprintf(GFP_KERNEL, "ttyRPMSG%d", rpdev->dst);
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2017-10-17 00:23:40 -06:00
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rpmsgtty_driver->major = UNNAMED_MAJOR;
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rpmsgtty_driver->minor_start = 0;
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2015-07-26 23:59:55 -06:00
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rpmsgtty_driver->type = TTY_DRIVER_TYPE_CONSOLE;
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rpmsgtty_driver->init_termios = tty_std_termios;
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tty_set_operations(rpmsgtty_driver, &imxrpmsgtty_ops);
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tty_port_init(&cport->port);
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cport->port.ops = &rpmsgtty_port_ops;
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spin_lock_init(&cport->rx_lock);
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cport->port.low_latency = cport->port.flags | ASYNC_LOW_LATENCY;
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2017-10-17 00:23:40 -06:00
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cport->rpdev = rpdev;
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dev_set_drvdata(&rpdev->dev, cport);
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rpmsgtty_driver->driver_state = cport;
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cport->rpmsgtty_driver = rpmsgtty_driver;
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ret = tty_register_driver(cport->rpmsgtty_driver);
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if (ret < 0) {
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pr_err("Couldn't install rpmsg tty driver: ret %d\n", ret);
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goto error1;
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} else {
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pr_info("Install rpmsg tty driver!\n");
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}
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2015-07-26 23:59:55 -06:00
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2017-10-17 00:23:40 -06:00
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/*
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* send a message to our remote processor, and tell remote
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* processor about this channel
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*/
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ret = rpmsg_send(rpdev->ept, MSG, strlen(MSG));
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if (ret) {
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dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
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2015-07-26 23:59:55 -06:00
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goto error;
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2017-10-17 00:23:40 -06:00
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}
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2015-07-26 23:59:55 -06:00
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return 0;
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error:
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2017-10-17 00:23:40 -06:00
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tty_unregister_driver(cport->rpmsgtty_driver);
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error1:
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put_tty_driver(cport->rpmsgtty_driver);
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2015-07-26 23:59:55 -06:00
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tty_port_destroy(&cport->port);
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2017-10-17 00:23:40 -06:00
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cport->rpmsgtty_driver = NULL;
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kfree(cport);
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2015-07-26 23:59:55 -06:00
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2017-10-17 00:23:40 -06:00
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return ret;
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2015-07-26 23:59:55 -06:00
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}
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static void rpmsg_tty_remove(struct rpmsg_device *rpdev)
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{
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2017-10-17 00:23:40 -06:00
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struct rpmsgtty_port *cport = dev_get_drvdata(&rpdev->dev);
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2015-07-26 23:59:55 -06:00
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dev_info(&rpdev->dev, "rpmsg tty driver is removed\n");
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2017-10-17 00:23:40 -06:00
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tty_unregister_driver(cport->rpmsgtty_driver);
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MLK-19864 rpmsg: imx: fix the kernel panic during tty rpmsg demo
Fix the kernel panic during tty rpmsg str echo demo.
Root cause: The driver name may be flushed.
Use the kasprintf to setup the rpmsg tty driver name to
fix this issue.
[ 35.494361] Unable to handle kernel paging request at virtual address
ffff000021b4ba40
[ 35.502321] Mem abort info:
[ 35.505117] Exception class = DABT (current EL), IL = 32 bits
[ 35.511099] SET = 0, FnV = 0
[ 35.514188] EA = 0, S1PTW = 0
[ 35.517328] Data abort info:
[ 35.520255] ISV = 0, ISS = 0x00000007
[ 35.524130] CM = 0, WnR = 0
[ 35.527140] swapper pgtable: 4k pages, 48-bit VAs, pgd =
ffff0000096dd000
[ 35.533964] [ffff000021b4ba40] *pgd=000000097fffe803,
*pud=000000097fffd803, *pmd=0000000973d20003, *pte=0000000000000000
[ 35.544976] Internal error: Oops: 96000007 [#1] PREEMPT SMP
[ 35.550553] Modules linked in: imx_rpmsg_tty
[ 35.554843] CPU: 2 PID: 3911 Comm: sh Not tainted
4.14.62-05098-gcff652e-dirty #41
[ 35.562419] Hardware name: Freescale i.MX8QM MEK (DT)
[ 35.567479] task: ffff8008f3950000 task.stack: ffff000021b10000
[ 35.573413] PC is at string+0x28/0x98
[ 35.577080] LR is at vsnprintf+0x3c0/0x688
[ 35.581177] pc : [<ffff000008d5f1a0>] lr : [<ffff000008d61c70>]
pstate: a0000145
[ 35.588577] sp : ffff000021b13970
[ 35.591894] x29: ffff000021b13970 x28: ffff80097365f56f
[ 35.597219] x27: ffff0000092cf03a x26: ffff0000092cf03a
[ 35.602544] x25: ffff000021b13a80 x24: ffff8008f365f570
[ 35.607869] x23: 00000000ffffffd8 x22: ffff000008fc08dc
[ 35.613195] x21: 000000007fffffff x20: ffff000008fc08cc
[ 35.618512] x19: ffff8008f365f570 x18: 0000000000000000
[ 35.623827] x17: 0000ffffbec93588 x16: ffff00000820b2c0
[ 35.629144] x15: 0000000000000000 x14: ffffffffffffffff
[ 35.634461] x13: 0000000000000018 x12: 0101010101010101
[ 35.639777] x11: 0000000000000000 x10: ffff000021b13a80
[ 35.645085] x9 : ffff000021b13a80 x8 : ffff000021b13a80
[ 35.650402] x7 : ffff8008f365f570 x6 : fffffffffffffffe
[ 35.655718] x5 : 00000000ffffffd0 x4 : ffff000021b4ba40
[ 35.661035] x3 : ffff0a00ffffff04 x2 : ffff80097365f56f
[ 35.666354] x1 : ffff80097365f56f x0 : ffffffffffffffff
[ 35.671672] Process sh (pid: 3911, stack limit = 0xffff000021b10000)
[ 35.678022] Call trace:
[ 35.680465] Exception stack(0xffff000021b13830 to 0xffff000021b13970)
[ 35.686911] 3820: ffffffffffffffff
ffff80097365f56f
[ 35.694748] 3840: ffff80097365f56f ffff0a00ffffff04 ffff000021b4ba40
00000000ffffffd0
[ 35.702581] 3860: fffffffffffffffe ffff8008f365f570 ffff000021b13a80
ffff000021b13a80
[ 35.710409] 3880: ffff000021b13a80 0000000000000000 0101010101010101
0000000000000018
[ 35.718245] 38a0: ffffffffffffffff 0000000000000000 ffff00000820b2c0
0000ffffbec93588
[ 35.726081] 38c0: 0000000000000000 ffff8008f365f570 ffff000008fc08cc
000000007fffffff
[ 35.733908] 38e0: ffff000008fc08dc 00000000ffffffd8 ffff8008f365f570
ffff000021b13a80
[ 35.741744] 3900: ffff0000092cf03a ffff0000092cf03a ffff80097365f56f
ffff000021b13970
[ 35.749583] 3920: ffff000008d61c70 ffff000021b13970 ffff000008d5f1a0
00000000a0000145
[ 35.757417] 3940: ffff8008fff5fb00 0000000000001c00 0000ffffffffffff
ffff000008d61930
[ 35.765254] 3960: ffff000021b13970 ffff000008d5f1a0
[ 35.770129] [<ffff000008d5f1a0>] string+0x28/0x98
[ 35.774837] [<ffff000008d61c70>] vsnprintf+0x3c0/0x688
[ 35.779980] [<ffff000008d620e4>] sprintf+0x4c/0x58
Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
Reviewed-by: Fugang Duan <fugang.duan@nxp.com>
2018-10-10 00:41:03 -06:00
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kfree(cport->rpmsgtty_driver->name);
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2017-10-17 00:23:40 -06:00
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put_tty_driver(cport->rpmsgtty_driver);
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2015-07-26 23:59:55 -06:00
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tty_port_destroy(&cport->port);
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2017-10-17 00:23:40 -06:00
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cport->rpmsgtty_driver = NULL;
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2015-07-26 23:59:55 -06:00
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}
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static struct rpmsg_device_id rpmsg_driver_tty_id_table[] = {
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2017-10-17 00:23:40 -06:00
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{ .name = "rpmsg-virtual-tty-channel-1" },
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2017-02-15 01:46:29 -07:00
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{ .name = "rpmsg-virtual-tty-channel" },
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2017-04-18 09:11:59 -06:00
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{ .name = "rpmsg-openamp-demo-channel" },
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2015-07-26 23:59:55 -06:00
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{ },
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};
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MODULE_DEVICE_TABLE(rpmsg, rpmsg_driver_tty_id_table);
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static struct rpmsg_driver rpmsg_tty_driver = {
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.drv.name = KBUILD_MODNAME,
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.drv.owner = THIS_MODULE,
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.id_table = rpmsg_driver_tty_id_table,
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.probe = rpmsg_tty_probe,
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.callback = rpmsg_tty_cb,
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.remove = rpmsg_tty_remove,
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};
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static int __init init(void)
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{
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return register_rpmsg_driver(&rpmsg_tty_driver);
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}
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static void __exit fini(void)
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{
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unregister_rpmsg_driver(&rpmsg_tty_driver);
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}
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module_init(init);
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module_exit(fini);
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MODULE_AUTHOR("Freescale Semiconductor, Inc.");
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MODULE_DESCRIPTION("iMX virtio remote processor messaging tty driver");
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MODULE_LICENSE("GPL v2");
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