Greg Kroah-Hartman | f16aa97 | 2019-04-02 16:07:08 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Jag Raman | 55bd213 | 2017-08-15 17:02:57 -0400 | [diff] [blame] | 2 | /* vcc.c: sun4v virtual channel concentrator |
| 3 | * |
| 4 | * Copyright (C) 2017 Oracle. All rights reserved. |
| 5 | */ |
| 6 | |
Jag Raman | 5d17105 | 2017-08-15 17:03:00 -0400 | [diff] [blame] | 7 | #include <linux/delay.h> |
| 8 | #include <linux/interrupt.h> |
Jag Raman | 55bd213 | 2017-08-15 17:02:57 -0400 | [diff] [blame] | 9 | #include <linux/module.h> |
Jag Raman | 5d17105 | 2017-08-15 17:03:00 -0400 | [diff] [blame] | 10 | #include <linux/slab.h> |
Jag Raman | 8868e44 | 2017-08-15 17:03:01 -0400 | [diff] [blame] | 11 | #include <linux/sysfs.h> |
Jag Raman | ce808b7 | 2017-08-15 17:02:59 -0400 | [diff] [blame] | 12 | #include <linux/tty.h> |
Jag Raman | f8c5533 | 2017-08-15 17:03:02 -0400 | [diff] [blame] | 13 | #include <linux/tty_flip.h> |
Al Viro | c9874d3f | 2018-08-16 11:47:53 -0400 | [diff] [blame] | 14 | #include <linux/termios_internal.h> |
Jag Raman | 5d17105 | 2017-08-15 17:03:00 -0400 | [diff] [blame] | 15 | #include <asm/vio.h> |
| 16 | #include <asm/ldc.h> |
Jag Raman | 55bd213 | 2017-08-15 17:02:57 -0400 | [diff] [blame] | 17 | |
Jag Raman | f283ebd | 2017-08-15 17:02:58 -0400 | [diff] [blame] | 18 | MODULE_DESCRIPTION("Sun LDOM virtual console concentrator driver"); |
| 19 | MODULE_LICENSE("GPL"); |
Jiri Slaby | 7330019 | 2021-03-02 07:21:56 +0100 | [diff] [blame] | 20 | MODULE_VERSION("1.1"); |
Jag Raman | f283ebd | 2017-08-15 17:02:58 -0400 | [diff] [blame] | 21 | |
Jag Raman | 5d17105 | 2017-08-15 17:03:00 -0400 | [diff] [blame] | 22 | struct vcc_port { |
| 23 | struct vio_driver_state vio; |
| 24 | |
| 25 | spinlock_t lock; |
| 26 | char *domain; |
| 27 | struct tty_struct *tty; /* only populated while dev is open */ |
| 28 | unsigned long index; /* index into the vcc_table */ |
| 29 | |
| 30 | u64 refcnt; |
| 31 | bool excl_locked; |
| 32 | |
| 33 | bool removed; |
| 34 | |
| 35 | /* This buffer is required to support the tty write_room interface |
| 36 | * and guarantee that any characters that the driver accepts will |
| 37 | * be eventually sent, either immediately or later. |
| 38 | */ |
| 39 | int chars_in_buffer; |
| 40 | struct vio_vcc buffer; |
| 41 | |
| 42 | struct timer_list rx_timer; |
| 43 | struct timer_list tx_timer; |
| 44 | }; |
| 45 | |
| 46 | /* Microseconds that thread will delay waiting for a vcc port ref */ |
| 47 | #define VCC_REF_DELAY 100 |
| 48 | |
Jag Raman | ce808b7 | 2017-08-15 17:02:59 -0400 | [diff] [blame] | 49 | #define VCC_MAX_PORTS 1024 |
| 50 | #define VCC_MINOR_START 0 /* must be zero */ |
Jag Raman | f8c5533 | 2017-08-15 17:03:02 -0400 | [diff] [blame] | 51 | #define VCC_BUFF_LEN VIO_VCC_MTU_SIZE |
Jag Raman | ce808b7 | 2017-08-15 17:02:59 -0400 | [diff] [blame] | 52 | |
Jag Raman | 8868e44 | 2017-08-15 17:03:01 -0400 | [diff] [blame] | 53 | #define VCC_CTL_BREAK -1 |
| 54 | #define VCC_CTL_HUP -2 |
| 55 | |
Jag Raman | ce808b7 | 2017-08-15 17:02:59 -0400 | [diff] [blame] | 56 | static struct tty_driver *vcc_tty_driver; |
| 57 | |
Jag Raman | 5d17105 | 2017-08-15 17:03:00 -0400 | [diff] [blame] | 58 | static struct vcc_port *vcc_table[VCC_MAX_PORTS]; |
| 59 | static DEFINE_SPINLOCK(vcc_table_lock); |
| 60 | |
Jiri Slaby | 4c472fc | 2021-03-02 07:21:55 +0100 | [diff] [blame] | 61 | static unsigned int vcc_dbg; |
| 62 | static unsigned int vcc_dbg_ldc; |
| 63 | static unsigned int vcc_dbg_vio; |
Jag Raman | f283ebd | 2017-08-15 17:02:58 -0400 | [diff] [blame] | 64 | |
| 65 | module_param(vcc_dbg, uint, 0664); |
| 66 | module_param(vcc_dbg_ldc, uint, 0664); |
| 67 | module_param(vcc_dbg_vio, uint, 0664); |
| 68 | |
| 69 | #define VCC_DBG_DRV 0x1 |
| 70 | #define VCC_DBG_LDC 0x2 |
| 71 | #define VCC_DBG_PKT 0x4 |
| 72 | |
| 73 | #define vccdbg(f, a...) \ |
| 74 | do { \ |
| 75 | if (vcc_dbg & VCC_DBG_DRV) \ |
| 76 | pr_info(f, ## a); \ |
| 77 | } while (0) \ |
| 78 | |
| 79 | #define vccdbgl(l) \ |
| 80 | do { \ |
| 81 | if (vcc_dbg & VCC_DBG_LDC) \ |
| 82 | ldc_print(l); \ |
| 83 | } while (0) \ |
| 84 | |
| 85 | #define vccdbgp(pkt) \ |
| 86 | do { \ |
| 87 | if (vcc_dbg & VCC_DBG_PKT) { \ |
| 88 | int i; \ |
| 89 | for (i = 0; i < pkt.tag.stype; i++) \ |
| 90 | pr_info("[%c]", pkt.data[i]); \ |
| 91 | } \ |
| 92 | } while (0) \ |
| 93 | |
Jag Raman | ce808b7 | 2017-08-15 17:02:59 -0400 | [diff] [blame] | 94 | /* Note: Be careful when adding flags to this line discipline. Don't |
| 95 | * add anything that will cause echoing or we'll go into recursive |
| 96 | * loop echoing chars back and forth with the console drivers. |
| 97 | */ |
Bhumika Goyal | 5bd0ea9 | 2017-08-28 23:58:44 +0530 | [diff] [blame] | 98 | static const struct ktermios vcc_tty_termios = { |
Jag Raman | ce808b7 | 2017-08-15 17:02:59 -0400 | [diff] [blame] | 99 | .c_iflag = IGNBRK | IGNPAR, |
| 100 | .c_oflag = OPOST, |
| 101 | .c_cflag = B38400 | CS8 | CREAD | HUPCL, |
| 102 | .c_cc = INIT_C_CC, |
| 103 | .c_ispeed = 38400, |
| 104 | .c_ospeed = 38400 |
| 105 | }; |
| 106 | |
Jag Raman | 5d17105 | 2017-08-15 17:03:00 -0400 | [diff] [blame] | 107 | /** |
| 108 | * vcc_table_add() - Add VCC port to the VCC table |
| 109 | * @port: pointer to the VCC port |
| 110 | * |
| 111 | * Return: index of the port in the VCC table on success, |
| 112 | * -1 on failure |
| 113 | */ |
| 114 | static int vcc_table_add(struct vcc_port *port) |
| 115 | { |
| 116 | unsigned long flags; |
| 117 | int i; |
| 118 | |
| 119 | spin_lock_irqsave(&vcc_table_lock, flags); |
| 120 | for (i = VCC_MINOR_START; i < VCC_MAX_PORTS; i++) { |
| 121 | if (!vcc_table[i]) { |
| 122 | vcc_table[i] = port; |
| 123 | break; |
| 124 | } |
| 125 | } |
| 126 | spin_unlock_irqrestore(&vcc_table_lock, flags); |
| 127 | |
| 128 | if (i < VCC_MAX_PORTS) |
| 129 | return i; |
| 130 | else |
| 131 | return -1; |
| 132 | } |
| 133 | |
| 134 | /** |
| 135 | * vcc_table_remove() - Removes a VCC port from the VCC table |
| 136 | * @index: Index into the VCC table |
| 137 | */ |
| 138 | static void vcc_table_remove(unsigned long index) |
| 139 | { |
| 140 | unsigned long flags; |
| 141 | |
| 142 | if (WARN_ON(index >= VCC_MAX_PORTS)) |
| 143 | return; |
| 144 | |
| 145 | spin_lock_irqsave(&vcc_table_lock, flags); |
| 146 | vcc_table[index] = NULL; |
| 147 | spin_unlock_irqrestore(&vcc_table_lock, flags); |
| 148 | } |
| 149 | |
| 150 | /** |
| 151 | * vcc_get() - Gets a reference to VCC port |
| 152 | * @index: Index into the VCC table |
| 153 | * @excl: Indicates if an exclusive access is requested |
| 154 | * |
| 155 | * Return: reference to the VCC port, if found |
| 156 | * NULL, if port not found |
| 157 | */ |
| 158 | static struct vcc_port *vcc_get(unsigned long index, bool excl) |
| 159 | { |
| 160 | struct vcc_port *port; |
| 161 | unsigned long flags; |
| 162 | |
| 163 | try_again: |
| 164 | spin_lock_irqsave(&vcc_table_lock, flags); |
| 165 | |
| 166 | port = vcc_table[index]; |
| 167 | if (!port) { |
| 168 | spin_unlock_irqrestore(&vcc_table_lock, flags); |
| 169 | return NULL; |
| 170 | } |
| 171 | |
| 172 | if (!excl) { |
| 173 | if (port->excl_locked) { |
| 174 | spin_unlock_irqrestore(&vcc_table_lock, flags); |
| 175 | udelay(VCC_REF_DELAY); |
| 176 | goto try_again; |
| 177 | } |
| 178 | port->refcnt++; |
| 179 | spin_unlock_irqrestore(&vcc_table_lock, flags); |
| 180 | return port; |
| 181 | } |
| 182 | |
| 183 | if (port->refcnt) { |
| 184 | spin_unlock_irqrestore(&vcc_table_lock, flags); |
| 185 | /* Threads wanting exclusive access will wait half the time, |
| 186 | * probably giving them higher priority in the case of |
| 187 | * multiple waiters. |
| 188 | */ |
| 189 | udelay(VCC_REF_DELAY/2); |
| 190 | goto try_again; |
| 191 | } |
| 192 | |
| 193 | port->refcnt++; |
| 194 | port->excl_locked = true; |
| 195 | spin_unlock_irqrestore(&vcc_table_lock, flags); |
| 196 | |
| 197 | return port; |
| 198 | } |
| 199 | |
| 200 | /** |
| 201 | * vcc_put() - Returns a reference to VCC port |
| 202 | * @port: pointer to VCC port |
| 203 | * @excl: Indicates if the returned reference is an exclusive reference |
| 204 | * |
| 205 | * Note: It's the caller's responsibility to ensure the correct value |
| 206 | * for the excl flag |
| 207 | */ |
| 208 | static void vcc_put(struct vcc_port *port, bool excl) |
| 209 | { |
| 210 | unsigned long flags; |
| 211 | |
| 212 | if (!port) |
| 213 | return; |
| 214 | |
| 215 | spin_lock_irqsave(&vcc_table_lock, flags); |
| 216 | |
| 217 | /* check if caller attempted to put with the wrong flags */ |
| 218 | if (WARN_ON((excl && !port->excl_locked) || |
| 219 | (!excl && port->excl_locked))) |
| 220 | goto done; |
| 221 | |
| 222 | port->refcnt--; |
| 223 | |
| 224 | if (excl) |
| 225 | port->excl_locked = false; |
| 226 | |
| 227 | done: |
| 228 | spin_unlock_irqrestore(&vcc_table_lock, flags); |
| 229 | } |
| 230 | |
| 231 | /** |
| 232 | * vcc_get_ne() - Get a non-exclusive reference to VCC port |
| 233 | * @index: Index into the VCC table |
| 234 | * |
| 235 | * Gets a non-exclusive reference to VCC port, if it's not removed |
| 236 | * |
| 237 | * Return: pointer to the VCC port, if found |
| 238 | * NULL, if port not found |
| 239 | */ |
| 240 | static struct vcc_port *vcc_get_ne(unsigned long index) |
| 241 | { |
| 242 | struct vcc_port *port; |
| 243 | |
| 244 | port = vcc_get(index, false); |
| 245 | |
| 246 | if (port && port->removed) { |
| 247 | vcc_put(port, false); |
| 248 | return NULL; |
| 249 | } |
| 250 | |
| 251 | return port; |
| 252 | } |
| 253 | |
Jag Raman | f8c5533 | 2017-08-15 17:03:02 -0400 | [diff] [blame] | 254 | static void vcc_kick_rx(struct vcc_port *port) |
| 255 | { |
| 256 | struct vio_driver_state *vio = &port->vio; |
| 257 | |
| 258 | assert_spin_locked(&port->lock); |
| 259 | |
| 260 | if (!timer_pending(&port->rx_timer) && !port->removed) { |
| 261 | disable_irq_nosync(vio->vdev->rx_irq); |
| 262 | port->rx_timer.expires = (jiffies + 1); |
| 263 | add_timer(&port->rx_timer); |
| 264 | } |
| 265 | } |
| 266 | |
| 267 | static void vcc_kick_tx(struct vcc_port *port) |
| 268 | { |
| 269 | assert_spin_locked(&port->lock); |
| 270 | |
| 271 | if (!timer_pending(&port->tx_timer) && !port->removed) { |
| 272 | port->tx_timer.expires = (jiffies + 1); |
| 273 | add_timer(&port->tx_timer); |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | static int vcc_rx_check(struct tty_struct *tty, int size) |
| 278 | { |
| 279 | if (WARN_ON(!tty || !tty->port)) |
| 280 | return 1; |
| 281 | |
| 282 | /* tty_buffer_request_room won't sleep because it uses |
| 283 | * GFP_ATOMIC flag to allocate buffer |
| 284 | */ |
| 285 | if (test_bit(TTY_THROTTLED, &tty->flags) || |
| 286 | (tty_buffer_request_room(tty->port, VCC_BUFF_LEN) < VCC_BUFF_LEN)) |
| 287 | return 0; |
| 288 | |
| 289 | return 1; |
| 290 | } |
| 291 | |
| 292 | static int vcc_rx(struct tty_struct *tty, char *buf, int size) |
| 293 | { |
| 294 | int len = 0; |
| 295 | |
| 296 | if (WARN_ON(!tty || !tty->port)) |
| 297 | return len; |
| 298 | |
| 299 | len = tty_insert_flip_string(tty->port, buf, size); |
| 300 | if (len) |
| 301 | tty_flip_buffer_push(tty->port); |
| 302 | |
| 303 | return len; |
| 304 | } |
| 305 | |
| 306 | static int vcc_ldc_read(struct vcc_port *port) |
| 307 | { |
| 308 | struct vio_driver_state *vio = &port->vio; |
| 309 | struct tty_struct *tty; |
| 310 | struct vio_vcc pkt; |
| 311 | int rv = 0; |
| 312 | |
| 313 | tty = port->tty; |
| 314 | if (!tty) { |
| 315 | rv = ldc_rx_reset(vio->lp); |
| 316 | vccdbg("VCC: reset rx q: rv=%d\n", rv); |
| 317 | goto done; |
| 318 | } |
| 319 | |
| 320 | /* Read as long as LDC has incoming data. */ |
| 321 | while (1) { |
| 322 | if (!vcc_rx_check(tty, VIO_VCC_MTU_SIZE)) { |
| 323 | vcc_kick_rx(port); |
| 324 | break; |
| 325 | } |
| 326 | |
| 327 | vccdbgl(vio->lp); |
| 328 | |
| 329 | rv = ldc_read(vio->lp, &pkt, sizeof(pkt)); |
| 330 | if (rv <= 0) |
| 331 | break; |
| 332 | |
| 333 | vccdbg("VCC: ldc_read()=%d\n", rv); |
| 334 | vccdbg("TAG [%02x:%02x:%04x:%08x]\n", |
| 335 | pkt.tag.type, pkt.tag.stype, |
| 336 | pkt.tag.stype_env, pkt.tag.sid); |
| 337 | |
| 338 | if (pkt.tag.type == VIO_TYPE_DATA) { |
| 339 | vccdbgp(pkt); |
| 340 | /* vcc_rx_check ensures memory availability */ |
| 341 | vcc_rx(tty, pkt.data, pkt.tag.stype); |
| 342 | } else { |
| 343 | pr_err("VCC: unknown msg [%02x:%02x:%04x:%08x]\n", |
| 344 | pkt.tag.type, pkt.tag.stype, |
| 345 | pkt.tag.stype_env, pkt.tag.sid); |
| 346 | rv = -ECONNRESET; |
| 347 | break; |
| 348 | } |
| 349 | |
| 350 | WARN_ON(rv != LDC_PACKET_SIZE); |
| 351 | } |
| 352 | |
| 353 | done: |
| 354 | return rv; |
| 355 | } |
| 356 | |
Kees Cook | 4790b6d | 2017-10-24 03:00:10 -0700 | [diff] [blame] | 357 | static void vcc_rx_timer(struct timer_list *t) |
Jag Raman | f8c5533 | 2017-08-15 17:03:02 -0400 | [diff] [blame] | 358 | { |
Kees Cook | 4790b6d | 2017-10-24 03:00:10 -0700 | [diff] [blame] | 359 | struct vcc_port *port = from_timer(port, t, rx_timer); |
Jag Raman | f8c5533 | 2017-08-15 17:03:02 -0400 | [diff] [blame] | 360 | struct vio_driver_state *vio; |
Jag Raman | f8c5533 | 2017-08-15 17:03:02 -0400 | [diff] [blame] | 361 | unsigned long flags; |
| 362 | int rv; |
| 363 | |
Jag Raman | f8c5533 | 2017-08-15 17:03:02 -0400 | [diff] [blame] | 364 | spin_lock_irqsave(&port->lock, flags); |
| 365 | port->rx_timer.expires = 0; |
| 366 | |
| 367 | vio = &port->vio; |
| 368 | |
| 369 | enable_irq(vio->vdev->rx_irq); |
| 370 | |
| 371 | if (!port->tty || port->removed) |
| 372 | goto done; |
| 373 | |
| 374 | rv = vcc_ldc_read(port); |
| 375 | if (rv == -ECONNRESET) |
| 376 | vio_conn_reset(vio); |
| 377 | |
| 378 | done: |
| 379 | spin_unlock_irqrestore(&port->lock, flags); |
| 380 | vcc_put(port, false); |
| 381 | } |
| 382 | |
Kees Cook | 4790b6d | 2017-10-24 03:00:10 -0700 | [diff] [blame] | 383 | static void vcc_tx_timer(struct timer_list *t) |
Jag Raman | f8c5533 | 2017-08-15 17:03:02 -0400 | [diff] [blame] | 384 | { |
Kees Cook | 4790b6d | 2017-10-24 03:00:10 -0700 | [diff] [blame] | 385 | struct vcc_port *port = from_timer(port, t, tx_timer); |
Jag Raman | f8c5533 | 2017-08-15 17:03:02 -0400 | [diff] [blame] | 386 | struct vio_vcc *pkt; |
| 387 | unsigned long flags; |
| 388 | int tosend = 0; |
| 389 | int rv; |
| 390 | |
Jag Raman | f8c5533 | 2017-08-15 17:03:02 -0400 | [diff] [blame] | 391 | spin_lock_irqsave(&port->lock, flags); |
| 392 | port->tx_timer.expires = 0; |
| 393 | |
| 394 | if (!port->tty || port->removed) |
| 395 | goto done; |
| 396 | |
| 397 | tosend = min(VCC_BUFF_LEN, port->chars_in_buffer); |
| 398 | if (!tosend) |
| 399 | goto done; |
| 400 | |
| 401 | pkt = &port->buffer; |
| 402 | pkt->tag.type = VIO_TYPE_DATA; |
| 403 | pkt->tag.stype = tosend; |
| 404 | vccdbgl(port->vio.lp); |
| 405 | |
| 406 | rv = ldc_write(port->vio.lp, pkt, (VIO_TAG_SIZE + tosend)); |
| 407 | WARN_ON(!rv); |
| 408 | |
| 409 | if (rv < 0) { |
| 410 | vccdbg("VCC: ldc_write()=%d\n", rv); |
| 411 | vcc_kick_tx(port); |
| 412 | } else { |
| 413 | struct tty_struct *tty = port->tty; |
| 414 | |
| 415 | port->chars_in_buffer = 0; |
| 416 | if (tty) |
| 417 | tty_wakeup(tty); |
| 418 | } |
| 419 | |
| 420 | done: |
| 421 | spin_unlock_irqrestore(&port->lock, flags); |
| 422 | vcc_put(port, false); |
| 423 | } |
| 424 | |
Jag Raman | 103b9b0 | 2017-08-15 17:03:03 -0400 | [diff] [blame] | 425 | /** |
| 426 | * vcc_event() - LDC event processing engine |
| 427 | * @arg: VCC private data |
| 428 | * @event: LDC event |
| 429 | * |
| 430 | * Handles LDC events for VCC |
| 431 | */ |
Jag Raman | 5d17105 | 2017-08-15 17:03:00 -0400 | [diff] [blame] | 432 | static void vcc_event(void *arg, int event) |
| 433 | { |
Jag Raman | 103b9b0 | 2017-08-15 17:03:03 -0400 | [diff] [blame] | 434 | struct vio_driver_state *vio; |
| 435 | struct vcc_port *port; |
| 436 | unsigned long flags; |
| 437 | int rv; |
| 438 | |
| 439 | port = arg; |
| 440 | vio = &port->vio; |
| 441 | |
| 442 | spin_lock_irqsave(&port->lock, flags); |
| 443 | |
| 444 | switch (event) { |
| 445 | case LDC_EVENT_RESET: |
| 446 | case LDC_EVENT_UP: |
| 447 | vio_link_state_change(vio, event); |
| 448 | break; |
| 449 | |
| 450 | case LDC_EVENT_DATA_READY: |
| 451 | rv = vcc_ldc_read(port); |
| 452 | if (rv == -ECONNRESET) |
| 453 | vio_conn_reset(vio); |
| 454 | break; |
| 455 | |
| 456 | default: |
| 457 | pr_err("VCC: unexpected LDC event(%d)\n", event); |
| 458 | } |
| 459 | |
| 460 | spin_unlock_irqrestore(&port->lock, flags); |
Jag Raman | 5d17105 | 2017-08-15 17:03:00 -0400 | [diff] [blame] | 461 | } |
| 462 | |
| 463 | static struct ldc_channel_config vcc_ldc_cfg = { |
| 464 | .event = vcc_event, |
| 465 | .mtu = VIO_VCC_MTU_SIZE, |
| 466 | .mode = LDC_MODE_RAW, |
| 467 | .debug = 0, |
| 468 | }; |
| 469 | |
| 470 | /* Ordered from largest major to lowest */ |
| 471 | static struct vio_version vcc_versions[] = { |
| 472 | { .major = 1, .minor = 0 }, |
| 473 | }; |
| 474 | |
Jag Raman | 8f03f94 | 2017-08-15 17:03:09 -0400 | [diff] [blame] | 475 | static struct tty_port_operations vcc_port_ops = { 0 }; |
| 476 | |
Zhen Lei | 2877389 | 2021-06-02 09:48:39 +0800 | [diff] [blame] | 477 | static ssize_t domain_show(struct device *dev, |
| 478 | struct device_attribute *attr, |
| 479 | char *buf) |
Jag Raman | 8868e44 | 2017-08-15 17:03:01 -0400 | [diff] [blame] | 480 | { |
| 481 | struct vcc_port *port; |
| 482 | int rv; |
| 483 | |
| 484 | port = dev_get_drvdata(dev); |
| 485 | if (!port) |
| 486 | return -ENODEV; |
| 487 | |
| 488 | rv = scnprintf(buf, PAGE_SIZE, "%s\n", port->domain); |
| 489 | |
| 490 | return rv; |
| 491 | } |
| 492 | |
| 493 | static int vcc_send_ctl(struct vcc_port *port, int ctl) |
| 494 | { |
| 495 | struct vio_vcc pkt; |
| 496 | int rv; |
| 497 | |
| 498 | pkt.tag.type = VIO_TYPE_CTRL; |
| 499 | pkt.tag.sid = ctl; |
| 500 | pkt.tag.stype = 0; |
| 501 | |
| 502 | rv = ldc_write(port->vio.lp, &pkt, sizeof(pkt.tag)); |
| 503 | WARN_ON(!rv); |
| 504 | vccdbg("VCC: ldc_write(%ld)=%d\n", sizeof(pkt.tag), rv); |
| 505 | |
| 506 | return rv; |
| 507 | } |
| 508 | |
Zhen Lei | 2877389 | 2021-06-02 09:48:39 +0800 | [diff] [blame] | 509 | static ssize_t break_store(struct device *dev, |
| 510 | struct device_attribute *attr, |
| 511 | const char *buf, size_t count) |
Jag Raman | 8868e44 | 2017-08-15 17:03:01 -0400 | [diff] [blame] | 512 | { |
| 513 | struct vcc_port *port; |
| 514 | unsigned long flags; |
| 515 | int rv = count; |
| 516 | int brk; |
| 517 | |
| 518 | port = dev_get_drvdata(dev); |
| 519 | if (!port) |
| 520 | return -ENODEV; |
| 521 | |
| 522 | spin_lock_irqsave(&port->lock, flags); |
| 523 | |
| 524 | if (sscanf(buf, "%ud", &brk) != 1 || brk != 1) |
| 525 | rv = -EINVAL; |
| 526 | else if (vcc_send_ctl(port, VCC_CTL_BREAK) < 0) |
Jag Raman | f8c5533 | 2017-08-15 17:03:02 -0400 | [diff] [blame] | 527 | vcc_kick_tx(port); |
Jag Raman | 8868e44 | 2017-08-15 17:03:01 -0400 | [diff] [blame] | 528 | |
| 529 | spin_unlock_irqrestore(&port->lock, flags); |
| 530 | |
| 531 | return rv; |
| 532 | } |
| 533 | |
Zhen Lei | 2877389 | 2021-06-02 09:48:39 +0800 | [diff] [blame] | 534 | static DEVICE_ATTR_ADMIN_RO(domain); |
| 535 | static DEVICE_ATTR_WO(break); |
Jag Raman | 8868e44 | 2017-08-15 17:03:01 -0400 | [diff] [blame] | 536 | |
| 537 | static struct attribute *vcc_sysfs_entries[] = { |
| 538 | &dev_attr_domain.attr, |
| 539 | &dev_attr_break.attr, |
| 540 | NULL |
| 541 | }; |
| 542 | |
| 543 | static struct attribute_group vcc_attribute_group = { |
| 544 | .name = NULL, |
| 545 | .attrs = vcc_sysfs_entries, |
| 546 | }; |
| 547 | |
Jag Raman | 5d17105 | 2017-08-15 17:03:00 -0400 | [diff] [blame] | 548 | /** |
| 549 | * vcc_probe() - Initialize VCC port |
| 550 | * @vdev: Pointer to VIO device of the new VCC port |
| 551 | * @id: VIO device ID |
| 552 | * |
| 553 | * Initializes a VCC port to receive serial console data from |
| 554 | * the guest domain. Sets up a TTY end point on the control |
| 555 | * domain. Sets up VIO/LDC link between the guest & control |
| 556 | * domain endpoints. |
| 557 | * |
| 558 | * Return: status of the probe |
| 559 | */ |
| 560 | static int vcc_probe(struct vio_dev *vdev, const struct vio_device_id *id) |
| 561 | { |
| 562 | struct mdesc_handle *hp; |
| 563 | struct vcc_port *port; |
| 564 | struct device *dev; |
| 565 | const char *domain; |
| 566 | char *name; |
| 567 | u64 node; |
| 568 | int rv; |
| 569 | |
| 570 | vccdbg("VCC: name=%s\n", dev_name(&vdev->dev)); |
| 571 | |
| 572 | if (!vcc_tty_driver) { |
| 573 | pr_err("VCC: TTY driver not registered\n"); |
| 574 | return -ENODEV; |
| 575 | } |
| 576 | |
| 577 | port = kzalloc(sizeof(struct vcc_port), GFP_KERNEL); |
| 578 | if (!port) |
| 579 | return -ENOMEM; |
| 580 | |
| 581 | name = kstrdup(dev_name(&vdev->dev), GFP_KERNEL); |
| 582 | |
| 583 | rv = vio_driver_init(&port->vio, vdev, VDEV_CONSOLE_CON, vcc_versions, |
| 584 | ARRAY_SIZE(vcc_versions), NULL, name); |
| 585 | if (rv) |
| 586 | goto free_port; |
| 587 | |
| 588 | port->vio.debug = vcc_dbg_vio; |
| 589 | vcc_ldc_cfg.debug = vcc_dbg_ldc; |
| 590 | |
| 591 | rv = vio_ldc_alloc(&port->vio, &vcc_ldc_cfg, port); |
| 592 | if (rv) |
| 593 | goto free_port; |
| 594 | |
| 595 | spin_lock_init(&port->lock); |
| 596 | |
| 597 | port->index = vcc_table_add(port); |
| 598 | if (port->index == -1) { |
| 599 | pr_err("VCC: no more TTY indices left for allocation\n"); |
Wei Yongjun | ff62255 | 2020-04-27 12:24:15 +0000 | [diff] [blame] | 600 | rv = -ENOMEM; |
Jag Raman | 5d17105 | 2017-08-15 17:03:00 -0400 | [diff] [blame] | 601 | goto free_ldc; |
| 602 | } |
| 603 | |
| 604 | /* Register the device using VCC table index as TTY index */ |
| 605 | dev = tty_register_device(vcc_tty_driver, port->index, &vdev->dev); |
| 606 | if (IS_ERR(dev)) { |
| 607 | rv = PTR_ERR(dev); |
| 608 | goto free_table; |
| 609 | } |
| 610 | |
| 611 | hp = mdesc_grab(); |
| 612 | |
| 613 | node = vio_vdev_node(hp, vdev); |
| 614 | if (node == MDESC_NODE_NULL) { |
| 615 | rv = -ENXIO; |
| 616 | mdesc_release(hp); |
| 617 | goto unreg_tty; |
| 618 | } |
| 619 | |
| 620 | domain = mdesc_get_property(hp, node, "vcc-domain-name", NULL); |
| 621 | if (!domain) { |
| 622 | rv = -ENXIO; |
| 623 | mdesc_release(hp); |
| 624 | goto unreg_tty; |
| 625 | } |
| 626 | port->domain = kstrdup(domain, GFP_KERNEL); |
| 627 | |
| 628 | mdesc_release(hp); |
| 629 | |
Jag Raman | 8868e44 | 2017-08-15 17:03:01 -0400 | [diff] [blame] | 630 | rv = sysfs_create_group(&vdev->dev.kobj, &vcc_attribute_group); |
| 631 | if (rv) |
| 632 | goto free_domain; |
| 633 | |
Kees Cook | 4790b6d | 2017-10-24 03:00:10 -0700 | [diff] [blame] | 634 | timer_setup(&port->rx_timer, vcc_rx_timer, 0); |
| 635 | timer_setup(&port->tx_timer, vcc_tx_timer, 0); |
Jag Raman | f8c5533 | 2017-08-15 17:03:02 -0400 | [diff] [blame] | 636 | |
Jag Raman | 5d17105 | 2017-08-15 17:03:00 -0400 | [diff] [blame] | 637 | dev_set_drvdata(&vdev->dev, port); |
| 638 | |
| 639 | /* It's possible to receive IRQs in the middle of vio_port_up. Disable |
| 640 | * IRQs until the port is up. |
| 641 | */ |
| 642 | disable_irq_nosync(vdev->rx_irq); |
| 643 | vio_port_up(&port->vio); |
| 644 | enable_irq(vdev->rx_irq); |
| 645 | |
| 646 | return 0; |
| 647 | |
Jag Raman | 8868e44 | 2017-08-15 17:03:01 -0400 | [diff] [blame] | 648 | free_domain: |
| 649 | kfree(port->domain); |
Jag Raman | 5d17105 | 2017-08-15 17:03:00 -0400 | [diff] [blame] | 650 | unreg_tty: |
| 651 | tty_unregister_device(vcc_tty_driver, port->index); |
| 652 | free_table: |
| 653 | vcc_table_remove(port->index); |
| 654 | free_ldc: |
| 655 | vio_ldc_free(&port->vio); |
| 656 | free_port: |
| 657 | kfree(name); |
| 658 | kfree(port); |
| 659 | |
| 660 | return rv; |
| 661 | } |
| 662 | |
| 663 | /** |
| 664 | * vcc_remove() - Terminate a VCC port |
| 665 | * @vdev: Pointer to VIO device of the VCC port |
| 666 | * |
| 667 | * Terminates a VCC port. Sets up the teardown of TTY and |
| 668 | * VIO/LDC link between guest and primary domains. |
| 669 | * |
| 670 | * Return: status of removal |
| 671 | */ |
Uwe Kleine-König | 1553573 | 2021-05-05 22:14:49 +0200 | [diff] [blame] | 672 | static void vcc_remove(struct vio_dev *vdev) |
Jag Raman | 5d17105 | 2017-08-15 17:03:00 -0400 | [diff] [blame] | 673 | { |
| 674 | struct vcc_port *port = dev_get_drvdata(&vdev->dev); |
| 675 | |
Jag Raman | f8c5533 | 2017-08-15 17:03:02 -0400 | [diff] [blame] | 676 | del_timer_sync(&port->rx_timer); |
| 677 | del_timer_sync(&port->tx_timer); |
| 678 | |
Jag Raman | 5d17105 | 2017-08-15 17:03:00 -0400 | [diff] [blame] | 679 | /* If there's a process with the device open, do a synchronous |
| 680 | * hangup of the TTY. This *may* cause the process to call close |
| 681 | * asynchronously, but it's not guaranteed. |
| 682 | */ |
| 683 | if (port->tty) |
| 684 | tty_vhangup(port->tty); |
| 685 | |
| 686 | /* Get exclusive reference to VCC, ensures that there are no other |
Uwe Kleine-König | 63e34e7 | 2021-01-14 18:57:18 +0100 | [diff] [blame] | 687 | * clients to this port. This cannot fail. |
Jag Raman | 5d17105 | 2017-08-15 17:03:00 -0400 | [diff] [blame] | 688 | */ |
Uwe Kleine-König | 63e34e7 | 2021-01-14 18:57:18 +0100 | [diff] [blame] | 689 | vcc_get(port->index, true); |
Jag Raman | 5d17105 | 2017-08-15 17:03:00 -0400 | [diff] [blame] | 690 | |
| 691 | tty_unregister_device(vcc_tty_driver, port->index); |
| 692 | |
| 693 | del_timer_sync(&port->vio.timer); |
| 694 | vio_ldc_free(&port->vio); |
Jag Raman | 8868e44 | 2017-08-15 17:03:01 -0400 | [diff] [blame] | 695 | sysfs_remove_group(&vdev->dev.kobj, &vcc_attribute_group); |
Jag Raman | 5d17105 | 2017-08-15 17:03:00 -0400 | [diff] [blame] | 696 | dev_set_drvdata(&vdev->dev, NULL); |
Jag Raman | 5d17105 | 2017-08-15 17:03:00 -0400 | [diff] [blame] | 697 | if (port->tty) { |
| 698 | port->removed = true; |
| 699 | vcc_put(port, true); |
| 700 | } else { |
| 701 | vcc_table_remove(port->index); |
| 702 | |
| 703 | kfree(port->vio.name); |
| 704 | kfree(port->domain); |
| 705 | kfree(port); |
| 706 | } |
Jag Raman | 5d17105 | 2017-08-15 17:03:00 -0400 | [diff] [blame] | 707 | } |
| 708 | |
| 709 | static const struct vio_device_id vcc_match[] = { |
| 710 | { |
| 711 | .type = "vcc-port", |
| 712 | }, |
| 713 | {}, |
| 714 | }; |
| 715 | MODULE_DEVICE_TABLE(vio, vcc_match); |
| 716 | |
| 717 | static struct vio_driver vcc_driver = { |
| 718 | .id_table = vcc_match, |
| 719 | .probe = vcc_probe, |
| 720 | .remove = vcc_remove, |
| 721 | .name = "vcc", |
| 722 | }; |
| 723 | |
Jag Raman | 63a7174 | 2017-08-15 17:03:04 -0400 | [diff] [blame] | 724 | static int vcc_open(struct tty_struct *tty, struct file *vcc_file) |
| 725 | { |
| 726 | struct vcc_port *port; |
| 727 | |
Jag Raman | 63a7174 | 2017-08-15 17:03:04 -0400 | [diff] [blame] | 728 | if (tty->count > 1) |
| 729 | return -EBUSY; |
| 730 | |
| 731 | port = vcc_get_ne(tty->index); |
| 732 | if (unlikely(!port)) { |
| 733 | pr_err("VCC: open: Failed to find VCC port\n"); |
| 734 | return -ENODEV; |
| 735 | } |
| 736 | |
| 737 | if (unlikely(!port->vio.lp)) { |
| 738 | pr_err("VCC: open: LDC channel not configured\n"); |
| 739 | vcc_put(port, false); |
| 740 | return -EPIPE; |
| 741 | } |
| 742 | vccdbgl(port->vio.lp); |
| 743 | |
| 744 | vcc_put(port, false); |
| 745 | |
| 746 | if (unlikely(!tty->port)) { |
| 747 | pr_err("VCC: open: TTY port not found\n"); |
| 748 | return -ENXIO; |
| 749 | } |
| 750 | |
| 751 | if (unlikely(!tty->port->ops)) { |
| 752 | pr_err("VCC: open: TTY ops not defined\n"); |
| 753 | return -ENXIO; |
| 754 | } |
| 755 | |
| 756 | return tty_port_open(tty->port, tty, vcc_file); |
| 757 | } |
| 758 | |
| 759 | static void vcc_close(struct tty_struct *tty, struct file *vcc_file) |
| 760 | { |
Jag Raman | 63a7174 | 2017-08-15 17:03:04 -0400 | [diff] [blame] | 761 | if (unlikely(tty->count > 1)) |
| 762 | return; |
| 763 | |
| 764 | if (unlikely(!tty->port)) { |
| 765 | pr_err("VCC: close: TTY port not found\n"); |
| 766 | return; |
| 767 | } |
| 768 | |
| 769 | tty_port_close(tty->port, tty, vcc_file); |
| 770 | } |
| 771 | |
Jag Raman | 6a3ff25 | 2017-08-15 17:03:05 -0400 | [diff] [blame] | 772 | static void vcc_ldc_hup(struct vcc_port *port) |
| 773 | { |
| 774 | unsigned long flags; |
| 775 | |
| 776 | spin_lock_irqsave(&port->lock, flags); |
| 777 | |
| 778 | if (vcc_send_ctl(port, VCC_CTL_HUP) < 0) |
| 779 | vcc_kick_tx(port); |
| 780 | |
| 781 | spin_unlock_irqrestore(&port->lock, flags); |
| 782 | } |
| 783 | |
| 784 | static void vcc_hangup(struct tty_struct *tty) |
| 785 | { |
| 786 | struct vcc_port *port; |
| 787 | |
Jag Raman | 6a3ff25 | 2017-08-15 17:03:05 -0400 | [diff] [blame] | 788 | port = vcc_get_ne(tty->index); |
| 789 | if (unlikely(!port)) { |
| 790 | pr_err("VCC: hangup: Failed to find VCC port\n"); |
| 791 | return; |
| 792 | } |
| 793 | |
| 794 | if (unlikely(!tty->port)) { |
| 795 | pr_err("VCC: hangup: TTY port not found\n"); |
| 796 | vcc_put(port, false); |
| 797 | return; |
| 798 | } |
| 799 | |
| 800 | vcc_ldc_hup(port); |
| 801 | |
| 802 | vcc_put(port, false); |
| 803 | |
| 804 | tty_port_hangup(tty->port); |
| 805 | } |
| 806 | |
Jag Raman | cf04526 | 2017-08-15 17:03:06 -0400 | [diff] [blame] | 807 | static int vcc_write(struct tty_struct *tty, const unsigned char *buf, |
| 808 | int count) |
| 809 | { |
| 810 | struct vcc_port *port; |
| 811 | struct vio_vcc *pkt; |
| 812 | unsigned long flags; |
| 813 | int total_sent = 0; |
| 814 | int tosend = 0; |
| 815 | int rv = -EINVAL; |
| 816 | |
Jag Raman | cf04526 | 2017-08-15 17:03:06 -0400 | [diff] [blame] | 817 | port = vcc_get_ne(tty->index); |
| 818 | if (unlikely(!port)) { |
| 819 | pr_err("VCC: write: Failed to find VCC port"); |
| 820 | return -ENODEV; |
| 821 | } |
| 822 | |
| 823 | spin_lock_irqsave(&port->lock, flags); |
| 824 | |
| 825 | pkt = &port->buffer; |
| 826 | pkt->tag.type = VIO_TYPE_DATA; |
| 827 | |
| 828 | while (count > 0) { |
| 829 | /* Minimum of data to write and space available */ |
| 830 | tosend = min(count, (VCC_BUFF_LEN - port->chars_in_buffer)); |
| 831 | |
| 832 | if (!tosend) |
| 833 | break; |
| 834 | |
| 835 | memcpy(&pkt->data[port->chars_in_buffer], &buf[total_sent], |
| 836 | tosend); |
| 837 | port->chars_in_buffer += tosend; |
| 838 | pkt->tag.stype = tosend; |
| 839 | |
| 840 | vccdbg("TAG [%02x:%02x:%04x:%08x]\n", pkt->tag.type, |
| 841 | pkt->tag.stype, pkt->tag.stype_env, pkt->tag.sid); |
| 842 | vccdbg("DATA [%s]\n", pkt->data); |
| 843 | vccdbgl(port->vio.lp); |
| 844 | |
| 845 | /* Since we know we have enough room in VCC buffer for tosend |
| 846 | * we record that it was sent regardless of whether the |
| 847 | * hypervisor actually took it because we have it buffered. |
| 848 | */ |
| 849 | rv = ldc_write(port->vio.lp, pkt, (VIO_TAG_SIZE + tosend)); |
| 850 | vccdbg("VCC: write: ldc_write(%d)=%d\n", |
| 851 | (VIO_TAG_SIZE + tosend), rv); |
| 852 | |
| 853 | total_sent += tosend; |
| 854 | count -= tosend; |
| 855 | if (rv < 0) { |
| 856 | vcc_kick_tx(port); |
| 857 | break; |
| 858 | } |
| 859 | |
| 860 | port->chars_in_buffer = 0; |
| 861 | } |
| 862 | |
| 863 | spin_unlock_irqrestore(&port->lock, flags); |
| 864 | |
| 865 | vcc_put(port, false); |
| 866 | |
| 867 | vccdbg("VCC: write: total=%d rv=%d", total_sent, rv); |
| 868 | |
| 869 | return total_sent ? total_sent : rv; |
| 870 | } |
| 871 | |
Jiri Slaby | 03b3b1a | 2021-05-05 11:19:15 +0200 | [diff] [blame] | 872 | static unsigned int vcc_write_room(struct tty_struct *tty) |
Jag Raman | cf04526 | 2017-08-15 17:03:06 -0400 | [diff] [blame] | 873 | { |
| 874 | struct vcc_port *port; |
Jiri Slaby | 03b3b1a | 2021-05-05 11:19:15 +0200 | [diff] [blame] | 875 | unsigned int num; |
Jag Raman | cf04526 | 2017-08-15 17:03:06 -0400 | [diff] [blame] | 876 | |
Jag Raman | cf04526 | 2017-08-15 17:03:06 -0400 | [diff] [blame] | 877 | port = vcc_get_ne(tty->index); |
| 878 | if (unlikely(!port)) { |
| 879 | pr_err("VCC: write_room: Failed to find VCC port\n"); |
Jiri Slaby | 6bfbfcf | 2021-03-02 07:22:14 +0100 | [diff] [blame] | 880 | return 0; |
Jag Raman | cf04526 | 2017-08-15 17:03:06 -0400 | [diff] [blame] | 881 | } |
| 882 | |
| 883 | num = VCC_BUFF_LEN - port->chars_in_buffer; |
| 884 | |
| 885 | vcc_put(port, false); |
| 886 | |
| 887 | return num; |
| 888 | } |
| 889 | |
Jiri Slaby | fff4ef1 | 2021-05-05 11:19:19 +0200 | [diff] [blame] | 890 | static unsigned int vcc_chars_in_buffer(struct tty_struct *tty) |
Jag Raman | aeee7de | 2017-08-15 17:03:07 -0400 | [diff] [blame] | 891 | { |
| 892 | struct vcc_port *port; |
Jiri Slaby | fff4ef1 | 2021-05-05 11:19:19 +0200 | [diff] [blame] | 893 | unsigned int num; |
Jag Raman | aeee7de | 2017-08-15 17:03:07 -0400 | [diff] [blame] | 894 | |
Jag Raman | aeee7de | 2017-08-15 17:03:07 -0400 | [diff] [blame] | 895 | port = vcc_get_ne(tty->index); |
| 896 | if (unlikely(!port)) { |
| 897 | pr_err("VCC: chars_in_buffer: Failed to find VCC port\n"); |
Jiri Slaby | 10eb63e | 2021-03-02 07:22:13 +0100 | [diff] [blame] | 898 | return 0; |
Jag Raman | aeee7de | 2017-08-15 17:03:07 -0400 | [diff] [blame] | 899 | } |
| 900 | |
| 901 | num = port->chars_in_buffer; |
| 902 | |
| 903 | vcc_put(port, false); |
| 904 | |
| 905 | return num; |
| 906 | } |
| 907 | |
Jag Raman | e942e57 | 2017-08-15 17:03:08 -0400 | [diff] [blame] | 908 | static int vcc_break_ctl(struct tty_struct *tty, int state) |
| 909 | { |
| 910 | struct vcc_port *port; |
| 911 | unsigned long flags; |
| 912 | |
Jag Raman | e942e57 | 2017-08-15 17:03:08 -0400 | [diff] [blame] | 913 | port = vcc_get_ne(tty->index); |
| 914 | if (unlikely(!port)) { |
| 915 | pr_err("VCC: break_ctl: Failed to find VCC port\n"); |
| 916 | return -ENODEV; |
| 917 | } |
| 918 | |
| 919 | /* Turn off break */ |
| 920 | if (state == 0) { |
| 921 | vcc_put(port, false); |
| 922 | return 0; |
| 923 | } |
| 924 | |
| 925 | spin_lock_irqsave(&port->lock, flags); |
| 926 | |
| 927 | if (vcc_send_ctl(port, VCC_CTL_BREAK) < 0) |
| 928 | vcc_kick_tx(port); |
| 929 | |
| 930 | spin_unlock_irqrestore(&port->lock, flags); |
| 931 | |
| 932 | vcc_put(port, false); |
| 933 | |
| 934 | return 0; |
| 935 | } |
| 936 | |
Jag Raman | 8f03f94 | 2017-08-15 17:03:09 -0400 | [diff] [blame] | 937 | static int vcc_install(struct tty_driver *driver, struct tty_struct *tty) |
| 938 | { |
| 939 | struct vcc_port *port_vcc; |
| 940 | struct tty_port *port_tty; |
| 941 | int ret; |
| 942 | |
Jag Raman | 8f03f94 | 2017-08-15 17:03:09 -0400 | [diff] [blame] | 943 | if (tty->index >= VCC_MAX_PORTS) |
| 944 | return -EINVAL; |
| 945 | |
| 946 | ret = tty_standard_install(driver, tty); |
| 947 | if (ret) |
| 948 | return ret; |
| 949 | |
| 950 | port_tty = kzalloc(sizeof(struct tty_port), GFP_KERNEL); |
| 951 | if (!port_tty) |
| 952 | return -ENOMEM; |
| 953 | |
| 954 | port_vcc = vcc_get(tty->index, true); |
| 955 | if (!port_vcc) { |
| 956 | pr_err("VCC: install: Failed to find VCC port\n"); |
| 957 | tty->port = NULL; |
| 958 | kfree(port_tty); |
| 959 | return -ENODEV; |
| 960 | } |
| 961 | |
| 962 | tty_port_init(port_tty); |
| 963 | port_tty->ops = &vcc_port_ops; |
| 964 | tty->port = port_tty; |
| 965 | |
| 966 | port_vcc->tty = tty; |
| 967 | |
| 968 | vcc_put(port_vcc, true); |
| 969 | |
| 970 | return 0; |
| 971 | } |
| 972 | |
| 973 | static void vcc_cleanup(struct tty_struct *tty) |
| 974 | { |
| 975 | struct vcc_port *port; |
| 976 | |
Jag Raman | 8f03f94 | 2017-08-15 17:03:09 -0400 | [diff] [blame] | 977 | port = vcc_get(tty->index, true); |
| 978 | if (port) { |
| 979 | port->tty = NULL; |
| 980 | |
| 981 | if (port->removed) { |
| 982 | vcc_table_remove(tty->index); |
| 983 | kfree(port->vio.name); |
| 984 | kfree(port->domain); |
| 985 | kfree(port); |
| 986 | } else { |
| 987 | vcc_put(port, true); |
| 988 | } |
| 989 | } |
| 990 | |
| 991 | tty_port_destroy(tty->port); |
| 992 | kfree(tty->port); |
| 993 | tty->port = NULL; |
| 994 | } |
| 995 | |
Jag Raman | 63a7174 | 2017-08-15 17:03:04 -0400 | [diff] [blame] | 996 | static const struct tty_operations vcc_ops = { |
Jag Raman | aeee7de | 2017-08-15 17:03:07 -0400 | [diff] [blame] | 997 | .open = vcc_open, |
| 998 | .close = vcc_close, |
| 999 | .hangup = vcc_hangup, |
| 1000 | .write = vcc_write, |
| 1001 | .write_room = vcc_write_room, |
| 1002 | .chars_in_buffer = vcc_chars_in_buffer, |
Jag Raman | e942e57 | 2017-08-15 17:03:08 -0400 | [diff] [blame] | 1003 | .break_ctl = vcc_break_ctl, |
Jag Raman | 8f03f94 | 2017-08-15 17:03:09 -0400 | [diff] [blame] | 1004 | .install = vcc_install, |
| 1005 | .cleanup = vcc_cleanup, |
Jag Raman | 63a7174 | 2017-08-15 17:03:04 -0400 | [diff] [blame] | 1006 | }; |
Jag Raman | ce808b7 | 2017-08-15 17:02:59 -0400 | [diff] [blame] | 1007 | |
| 1008 | #define VCC_TTY_FLAGS (TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_REAL_RAW) |
| 1009 | |
| 1010 | static int vcc_tty_init(void) |
| 1011 | { |
| 1012 | int rv; |
| 1013 | |
Jag Raman | ce808b7 | 2017-08-15 17:02:59 -0400 | [diff] [blame] | 1014 | vcc_tty_driver = tty_alloc_driver(VCC_MAX_PORTS, VCC_TTY_FLAGS); |
Dan Carpenter | c6b4ee9 | 2017-08-26 09:12:05 +0300 | [diff] [blame] | 1015 | if (IS_ERR(vcc_tty_driver)) { |
Jag Raman | ce808b7 | 2017-08-15 17:02:59 -0400 | [diff] [blame] | 1016 | pr_err("VCC: TTY driver alloc failed\n"); |
Dan Carpenter | c6b4ee9 | 2017-08-26 09:12:05 +0300 | [diff] [blame] | 1017 | return PTR_ERR(vcc_tty_driver); |
Jag Raman | ce808b7 | 2017-08-15 17:02:59 -0400 | [diff] [blame] | 1018 | } |
| 1019 | |
Jiri Slaby | 9af6f74 | 2021-03-02 07:21:57 +0100 | [diff] [blame] | 1020 | vcc_tty_driver->driver_name = "vcc"; |
| 1021 | vcc_tty_driver->name = "vcc"; |
Jag Raman | ce808b7 | 2017-08-15 17:02:59 -0400 | [diff] [blame] | 1022 | |
| 1023 | vcc_tty_driver->minor_start = VCC_MINOR_START; |
| 1024 | vcc_tty_driver->type = TTY_DRIVER_TYPE_SYSTEM; |
| 1025 | vcc_tty_driver->init_termios = vcc_tty_termios; |
| 1026 | |
| 1027 | tty_set_operations(vcc_tty_driver, &vcc_ops); |
| 1028 | |
| 1029 | rv = tty_register_driver(vcc_tty_driver); |
| 1030 | if (rv) { |
| 1031 | pr_err("VCC: TTY driver registration failed\n"); |
Jiri Slaby | 9f90a4d | 2021-07-23 09:43:16 +0200 | [diff] [blame] | 1032 | tty_driver_kref_put(vcc_tty_driver); |
Jag Raman | ce808b7 | 2017-08-15 17:02:59 -0400 | [diff] [blame] | 1033 | vcc_tty_driver = NULL; |
| 1034 | return rv; |
| 1035 | } |
| 1036 | |
| 1037 | vccdbg("VCC: TTY driver registered\n"); |
| 1038 | |
| 1039 | return 0; |
| 1040 | } |
| 1041 | |
| 1042 | static void vcc_tty_exit(void) |
| 1043 | { |
| 1044 | tty_unregister_driver(vcc_tty_driver); |
Jiri Slaby | 9f90a4d | 2021-07-23 09:43:16 +0200 | [diff] [blame] | 1045 | tty_driver_kref_put(vcc_tty_driver); |
Jag Raman | ce808b7 | 2017-08-15 17:02:59 -0400 | [diff] [blame] | 1046 | vccdbg("VCC: TTY driver unregistered\n"); |
| 1047 | |
| 1048 | vcc_tty_driver = NULL; |
| 1049 | } |
| 1050 | |
Jag Raman | 55bd213 | 2017-08-15 17:02:57 -0400 | [diff] [blame] | 1051 | static int __init vcc_init(void) |
| 1052 | { |
Jag Raman | ce808b7 | 2017-08-15 17:02:59 -0400 | [diff] [blame] | 1053 | int rv; |
| 1054 | |
| 1055 | rv = vcc_tty_init(); |
| 1056 | if (rv) { |
| 1057 | pr_err("VCC: TTY init failed\n"); |
| 1058 | return rv; |
| 1059 | } |
| 1060 | |
Jag Raman | 5d17105 | 2017-08-15 17:03:00 -0400 | [diff] [blame] | 1061 | rv = vio_register_driver(&vcc_driver); |
| 1062 | if (rv) { |
| 1063 | pr_err("VCC: VIO driver registration failed\n"); |
| 1064 | vcc_tty_exit(); |
| 1065 | } else { |
| 1066 | vccdbg("VCC: VIO driver registered successfully\n"); |
| 1067 | } |
| 1068 | |
Jag Raman | ce808b7 | 2017-08-15 17:02:59 -0400 | [diff] [blame] | 1069 | return rv; |
Jag Raman | 55bd213 | 2017-08-15 17:02:57 -0400 | [diff] [blame] | 1070 | } |
| 1071 | |
| 1072 | static void __exit vcc_exit(void) |
| 1073 | { |
Jag Raman | 5d17105 | 2017-08-15 17:03:00 -0400 | [diff] [blame] | 1074 | vio_unregister_driver(&vcc_driver); |
| 1075 | vccdbg("VCC: VIO driver unregistered\n"); |
Jag Raman | ce808b7 | 2017-08-15 17:02:59 -0400 | [diff] [blame] | 1076 | vcc_tty_exit(); |
| 1077 | vccdbg("VCC: TTY driver unregistered\n"); |
Jag Raman | 55bd213 | 2017-08-15 17:02:57 -0400 | [diff] [blame] | 1078 | } |
| 1079 | |
| 1080 | module_init(vcc_init); |
| 1081 | module_exit(vcc_exit); |