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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * nosy - Snoop mode driver for TI PCILynx 1394 controllers
4 * Copyright (C) 2002-2007 Kristian Høgsberg
5 */
6
7#include <linux/device.h>
8#include <linux/errno.h>
9#include <linux/fs.h>
10#include <linux/init.h>
11#include <linux/interrupt.h>
12#include <linux/io.h>
13#include <linux/kernel.h>
14#include <linux/kref.h>
15#include <linux/miscdevice.h>
16#include <linux/module.h>
17#include <linux/mutex.h>
18#include <linux/pci.h>
19#include <linux/poll.h>
20#include <linux/sched.h> /* required for linux/wait.h */
21#include <linux/slab.h>
22#include <linux/spinlock.h>
23#include <linux/time64.h>
24#include <linux/timex.h>
25#include <linux/uaccess.h>
26#include <linux/wait.h>
27#include <linux/dma-mapping.h>
28#include <linux/atomic.h>
29#include <asm/byteorder.h>
30
31#include "nosy.h"
32#include "nosy-user.h"
33
34#define TCODE_PHY_PACKET 0x10
35#define PCI_DEVICE_ID_TI_PCILYNX 0x8000
36
37static char driver_name[] = KBUILD_MODNAME;
38
39#define RCV_BUFFER_SIZE (16 * 1024)
40
41/* this is the physical layout of a PCL, its size is 128 bytes */
42struct pcl {
43 __le32 next;
44 __le32 async_error_next;
45 u32 user_data;
46 __le32 pcl_status;
47 __le32 remaining_transfer_count;
48 __le32 next_data_buffer;
49 struct {
50 __le32 control;
51 __le32 pointer;
52 } buffer[13];
53};
54
55struct packet {
56 unsigned int length;
57 char data[];
58};
59
60struct packet_buffer {
61 char *data;
62 size_t capacity;
63 long total_packet_count, lost_packet_count;
64 atomic_t size;
65 struct packet *head, *tail;
66 wait_queue_head_t wait;
67};
68
69struct pcilynx {
70 struct pci_dev *pci_device;
71 __iomem char *registers;
72
73 struct pcl *rcv_start_pcl, *rcv_pcl;
74 __le32 *rcv_buffer;
75
76 dma_addr_t rcv_start_pcl_bus, rcv_pcl_bus, rcv_buffer_bus;
77
78 spinlock_t client_list_lock;
79 struct list_head client_list;
80
81 struct miscdevice misc;
82 struct list_head link;
83 struct kref kref;
84};
85
86static inline struct pcilynx *
87lynx_get(struct pcilynx *lynx)
88{
89 kref_get(&lynx->kref);
90
91 return lynx;
92}
93
94static void
95lynx_release(struct kref *kref)
96{
97 kfree(container_of(kref, struct pcilynx, kref));
98}
99
100static inline void
101lynx_put(struct pcilynx *lynx)
102{
103 kref_put(&lynx->kref, lynx_release);
104}
105
106struct client {
107 struct pcilynx *lynx;
108 u32 tcode_mask;
109 struct packet_buffer buffer;
110 struct list_head link;
111};
112
113static DEFINE_MUTEX(card_mutex);
114static LIST_HEAD(card_list);
115
116static int
117packet_buffer_init(struct packet_buffer *buffer, size_t capacity)
118{
119 buffer->data = kmalloc(capacity, GFP_KERNEL);
120 if (buffer->data == NULL)
121 return -ENOMEM;
122 buffer->head = (struct packet *) buffer->data;
123 buffer->tail = (struct packet *) buffer->data;
124 buffer->capacity = capacity;
125 buffer->lost_packet_count = 0;
126 atomic_set(&buffer->size, 0);
127 init_waitqueue_head(&buffer->wait);
128
129 return 0;
130}
131
132static void
133packet_buffer_destroy(struct packet_buffer *buffer)
134{
135 kfree(buffer->data);
136}
137
138static int
139packet_buffer_get(struct client *client, char __user *data, size_t user_length)
140{
141 struct packet_buffer *buffer = &client->buffer;
142 size_t length;
143 char *end;
144
145 if (wait_event_interruptible(buffer->wait,
146 atomic_read(&buffer->size) > 0) ||
147 list_empty(&client->lynx->link))
148 return -ERESTARTSYS;
149
150 if (atomic_read(&buffer->size) == 0)
151 return -ENODEV;
152
153 length = buffer->head->length;
154
155 if (length > user_length)
156 return 0;
157
158 end = buffer->data + buffer->capacity;
159
160 if (&buffer->head->data[length] < end) {
161 if (copy_to_user(data, buffer->head->data, length))
162 return -EFAULT;
163 buffer->head = (struct packet *) &buffer->head->data[length];
164 } else {
165 size_t split = end - buffer->head->data;
166
167 if (copy_to_user(data, buffer->head->data, split))
168 return -EFAULT;
169 if (copy_to_user(data + split, buffer->data, length - split))
170 return -EFAULT;
171 buffer->head = (struct packet *) &buffer->data[length - split];
172 }
173
174 /*
175 * Decrease buffer->size as the last thing, since this is what
176 * keeps the interrupt from overwriting the packet we are
177 * retrieving from the buffer.
178 */
179 atomic_sub(sizeof(struct packet) + length, &buffer->size);
180
181 return length;
182}
183
184static void
185packet_buffer_put(struct packet_buffer *buffer, void *data, size_t length)
186{
187 char *end;
188
189 buffer->total_packet_count++;
190
191 if (buffer->capacity <
192 atomic_read(&buffer->size) + sizeof(struct packet) + length) {
193 buffer->lost_packet_count++;
194 return;
195 }
196
197 end = buffer->data + buffer->capacity;
198 buffer->tail->length = length;
199
200 if (&buffer->tail->data[length] < end) {
201 memcpy(buffer->tail->data, data, length);
202 buffer->tail = (struct packet *) &buffer->tail->data[length];
203 } else {
204 size_t split = end - buffer->tail->data;
205
206 memcpy(buffer->tail->data, data, split);
207 memcpy(buffer->data, data + split, length - split);
208 buffer->tail = (struct packet *) &buffer->data[length - split];
209 }
210
211 /* Finally, adjust buffer size and wake up userspace reader. */
212
213 atomic_add(sizeof(struct packet) + length, &buffer->size);
214 wake_up_interruptible(&buffer->wait);
215}
216
217static inline void
218reg_write(struct pcilynx *lynx, int offset, u32 data)
219{
220 writel(data, lynx->registers + offset);
221}
222
223static inline u32
224reg_read(struct pcilynx *lynx, int offset)
225{
226 return readl(lynx->registers + offset);
227}
228
229static inline void
230reg_set_bits(struct pcilynx *lynx, int offset, u32 mask)
231{
232 reg_write(lynx, offset, (reg_read(lynx, offset) | mask));
233}
234
235/*
236 * Maybe the pcl programs could be set up to just append data instead
237 * of using a whole packet.
238 */
239static inline void
240run_pcl(struct pcilynx *lynx, dma_addr_t pcl_bus,
241 int dmachan)
242{
243 reg_write(lynx, DMA0_CURRENT_PCL + dmachan * 0x20, pcl_bus);
244 reg_write(lynx, DMA0_CHAN_CTRL + dmachan * 0x20,
245 DMA_CHAN_CTRL_ENABLE | DMA_CHAN_CTRL_LINK);
246}
247
248static int
249set_phy_reg(struct pcilynx *lynx, int addr, int val)
250{
251 if (addr > 15) {
252 dev_err(&lynx->pci_device->dev,
253 "PHY register address %d out of range\n", addr);
254 return -1;
255 }
256 if (val > 0xff) {
257 dev_err(&lynx->pci_device->dev,
258 "PHY register value %d out of range\n", val);
259 return -1;
260 }
261 reg_write(lynx, LINK_PHY, LINK_PHY_WRITE |
262 LINK_PHY_ADDR(addr) | LINK_PHY_WDATA(val));
263
264 return 0;
265}
266
267static int
268nosy_open(struct inode *inode, struct file *file)
269{
270 int minor = iminor(inode);
271 struct client *client;
272 struct pcilynx *tmp, *lynx = NULL;
273
274 mutex_lock(&card_mutex);
275 list_for_each_entry(tmp, &card_list, link)
276 if (tmp->misc.minor == minor) {
277 lynx = lynx_get(tmp);
278 break;
279 }
280 mutex_unlock(&card_mutex);
281 if (lynx == NULL)
282 return -ENODEV;
283
284 client = kmalloc_obj(*client);
285 if (client == NULL)
286 goto fail;
287
288 client->tcode_mask = ~0;
289 client->lynx = lynx;
290 INIT_LIST_HEAD(&client->link);
291
292 if (packet_buffer_init(&client->buffer, 128 * 1024) < 0)
293 goto fail;
294
295 file->private_data = client;
296
297 return stream_open(inode, file);
298fail:
299 kfree(client);
300 lynx_put(lynx);
301
302 return -ENOMEM;
303}
304
305static int
306nosy_release(struct inode *inode, struct file *file)
307{
308 struct client *client = file->private_data;
309 struct pcilynx *lynx = client->lynx;
310
311 spin_lock_irq(&lynx->client_list_lock);
312 list_del_init(&client->link);
313 spin_unlock_irq(&lynx->client_list_lock);
314
315 packet_buffer_destroy(&client->buffer);
316 kfree(client);
317 lynx_put(lynx);
318
319 return 0;
320}
321
322static __poll_t
323nosy_poll(struct file *file, poll_table *pt)
324{
325 struct client *client = file->private_data;
326 __poll_t ret = 0;
327
328 poll_wait(file, &client->buffer.wait, pt);
329
330 if (atomic_read(&client->buffer.size) > 0)
331 ret = EPOLLIN | EPOLLRDNORM;
332
333 if (list_empty(&client->lynx->link))
334 ret |= EPOLLHUP;
335
336 return ret;
337}
338
339static ssize_t
340nosy_read(struct file *file, char __user *buffer, size_t count, loff_t *offset)
341{
342 struct client *client = file->private_data;
343
344 return packet_buffer_get(client, buffer, count);
345}
346
347static long
348nosy_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
349{
350 struct client *client = file->private_data;
351 spinlock_t *client_list_lock = &client->lynx->client_list_lock;
352 struct nosy_stats stats;
353 int ret;
354
355 switch (cmd) {
356 case NOSY_IOC_GET_STATS:
357 spin_lock_irq(client_list_lock);
358 stats.total_packet_count = client->buffer.total_packet_count;
359 stats.lost_packet_count = client->buffer.lost_packet_count;
360 spin_unlock_irq(client_list_lock);
361
362 if (copy_to_user((void __user *) arg, &stats, sizeof stats))
363 return -EFAULT;
364 else
365 return 0;
366
367 case NOSY_IOC_START:
368 ret = -EBUSY;
369 spin_lock_irq(client_list_lock);
370 if (list_empty(&client->link)) {
371 list_add_tail(&client->link, &client->lynx->client_list);
372 ret = 0;
373 }
374 spin_unlock_irq(client_list_lock);
375
376 return ret;
377
378 case NOSY_IOC_STOP:
379 spin_lock_irq(client_list_lock);
380 list_del_init(&client->link);
381 spin_unlock_irq(client_list_lock);
382
383 return 0;
384
385 case NOSY_IOC_FILTER:
386 spin_lock_irq(client_list_lock);
387 client->tcode_mask = arg;
388 spin_unlock_irq(client_list_lock);
389
390 return 0;
391
392 default:
393 return -EINVAL;
394 /* Flush buffer, configure filter. */
395 }
396}
397
398static const struct file_operations nosy_ops = {
399 .owner = THIS_MODULE,
400 .read = nosy_read,
401 .unlocked_ioctl = nosy_ioctl,
402 .poll = nosy_poll,
403 .open = nosy_open,
404 .release = nosy_release,
405};
406
407#define PHY_PACKET_SIZE 12 /* 1 payload, 1 inverse, 1 ack = 3 quadlets */
408
409static void
410packet_irq_handler(struct pcilynx *lynx)
411{
412 struct client *client;
413 u32 tcode_mask, tcode, timestamp;
414 size_t length;
415 struct timespec64 ts64;
416
417 /* FIXME: Also report rcv_speed. */
418
419 length = __le32_to_cpu(lynx->rcv_pcl->pcl_status) & 0x00001fff;
420 tcode = __le32_to_cpu(lynx->rcv_buffer[1]) >> 4 & 0xf;
421
422 ktime_get_real_ts64(&ts64);
423 timestamp = ts64.tv_nsec / NSEC_PER_USEC;
424 lynx->rcv_buffer[0] = (__force __le32)timestamp;
425
426 if (length == PHY_PACKET_SIZE)
427 tcode_mask = 1 << TCODE_PHY_PACKET;
428 else
429 tcode_mask = 1 << tcode;
430
431 spin_lock(&lynx->client_list_lock);
432
433 list_for_each_entry(client, &lynx->client_list, link)
434 if (client->tcode_mask & tcode_mask)
435 packet_buffer_put(&client->buffer,
436 lynx->rcv_buffer, length + 4);
437
438 spin_unlock(&lynx->client_list_lock);
439}
440
441static void
442bus_reset_irq_handler(struct pcilynx *lynx)
443{
444 struct client *client;
445 struct timespec64 ts64;
446 u32 timestamp;
447
448 ktime_get_real_ts64(&ts64);
449 timestamp = ts64.tv_nsec / NSEC_PER_USEC;
450
451 spin_lock(&lynx->client_list_lock);
452
453 list_for_each_entry(client, &lynx->client_list, link)
454 packet_buffer_put(&client->buffer, &timestamp, 4);
455
456 spin_unlock(&lynx->client_list_lock);
457}
458
459static irqreturn_t
460irq_handler(int irq, void *device)
461{
462 struct pcilynx *lynx = device;
463 u32 pci_int_status;
464
465 pci_int_status = reg_read(lynx, PCI_INT_STATUS);
466
467 if (pci_int_status == ~0)
468 /* Card was ejected. */
469 return IRQ_NONE;
470
471 if ((pci_int_status & PCI_INT_INT_PEND) == 0)
472 /* Not our interrupt, bail out quickly. */
473 return IRQ_NONE;
474
475 if ((pci_int_status & PCI_INT_P1394_INT) != 0) {
476 u32 link_int_status;
477
478 link_int_status = reg_read(lynx, LINK_INT_STATUS);
479 reg_write(lynx, LINK_INT_STATUS, link_int_status);
480
481 if ((link_int_status & LINK_INT_PHY_BUSRESET) > 0)
482 bus_reset_irq_handler(lynx);
483 }
484
485 /* Clear the PCI_INT_STATUS register only after clearing the
486 * LINK_INT_STATUS register; otherwise the PCI_INT_P1394 will
487 * be set again immediately. */
488
489 reg_write(lynx, PCI_INT_STATUS, pci_int_status);
490
491 if ((pci_int_status & PCI_INT_DMA0_HLT) > 0) {
492 packet_irq_handler(lynx);
493 run_pcl(lynx, lynx->rcv_start_pcl_bus, 0);
494 }
495
496 return IRQ_HANDLED;
497}
498
499static void
500remove_card(struct pci_dev *dev)
501{
502 struct pcilynx *lynx = pci_get_drvdata(dev);
503 struct client *client;
504
505 mutex_lock(&card_mutex);
506 list_del_init(&lynx->link);
507 misc_deregister(&lynx->misc);
508 mutex_unlock(&card_mutex);
509
510 reg_write(lynx, PCI_INT_ENABLE, 0);
511 free_irq(lynx->pci_device->irq, lynx);
512
513 spin_lock_irq(&lynx->client_list_lock);
514 list_for_each_entry(client, &lynx->client_list, link)
515 wake_up_interruptible(&client->buffer.wait);
516 spin_unlock_irq(&lynx->client_list_lock);
517
518 dma_free_coherent(&lynx->pci_device->dev, sizeof(struct pcl),
519 lynx->rcv_start_pcl, lynx->rcv_start_pcl_bus);
520 dma_free_coherent(&lynx->pci_device->dev, sizeof(struct pcl),
521 lynx->rcv_pcl, lynx->rcv_pcl_bus);
522 dma_free_coherent(&lynx->pci_device->dev, RCV_BUFFER_SIZE,
523 lynx->rcv_buffer, lynx->rcv_buffer_bus);
524
525 iounmap(lynx->registers);
526 pci_disable_device(dev);
527 lynx_put(lynx);
528}
529
530static int
531add_card(struct pci_dev *dev, const struct pci_device_id *unused)
532{
533 struct pcilynx *lynx;
534 u32 p, end;
535 int ret, i;
536
537 if (dma_set_mask(&dev->dev, DMA_BIT_MASK(32))) {
538 dev_err(&dev->dev,
539 "DMA address limits not supported for PCILynx hardware\n");
540 return -ENXIO;
541 }
542 if (pci_enable_device(dev)) {
543 dev_err(&dev->dev, "Failed to enable PCILynx hardware\n");
544 return -ENXIO;
545 }
546 pci_set_master(dev);
547
548 lynx = kzalloc_obj(*lynx);
549 if (lynx == NULL) {
550 dev_err(&dev->dev, "Failed to allocate control structure\n");
551 ret = -ENOMEM;
552 goto fail_disable;
553 }
554 lynx->pci_device = dev;
555 pci_set_drvdata(dev, lynx);
556
557 spin_lock_init(&lynx->client_list_lock);
558 INIT_LIST_HEAD(&lynx->client_list);
559 kref_init(&lynx->kref);
560
561 lynx->registers = ioremap(pci_resource_start(dev, 0),
562 PCILYNX_MAX_REGISTER);
563 if (lynx->registers == NULL) {
564 dev_err(&dev->dev, "Failed to map registers\n");
565 ret = -ENOMEM;
566 goto fail_deallocate_lynx;
567 }
568
569 lynx->rcv_start_pcl = dma_alloc_coherent(&lynx->pci_device->dev,
570 sizeof(struct pcl),
571 &lynx->rcv_start_pcl_bus,
572 GFP_KERNEL);
573 lynx->rcv_pcl = dma_alloc_coherent(&lynx->pci_device->dev,
574 sizeof(struct pcl),
575 &lynx->rcv_pcl_bus, GFP_KERNEL);
576 lynx->rcv_buffer = dma_alloc_coherent(&lynx->pci_device->dev,
577 RCV_BUFFER_SIZE,
578 &lynx->rcv_buffer_bus, GFP_KERNEL);
579 if (lynx->rcv_start_pcl == NULL ||
580 lynx->rcv_pcl == NULL ||
581 lynx->rcv_buffer == NULL) {
582 dev_err(&dev->dev, "Failed to allocate receive buffer\n");
583 ret = -ENOMEM;
584 goto fail_deallocate_buffers;
585 }
586 lynx->rcv_start_pcl->next = cpu_to_le32(lynx->rcv_pcl_bus);
587 lynx->rcv_pcl->next = cpu_to_le32(PCL_NEXT_INVALID);
588 lynx->rcv_pcl->async_error_next = cpu_to_le32(PCL_NEXT_INVALID);
589
590 lynx->rcv_pcl->buffer[0].control =
591 cpu_to_le32(PCL_CMD_RCV | PCL_BIGENDIAN | 2044);
592 lynx->rcv_pcl->buffer[0].pointer =
593 cpu_to_le32(lynx->rcv_buffer_bus + 4);
594 p = lynx->rcv_buffer_bus + 2048;
595 end = lynx->rcv_buffer_bus + RCV_BUFFER_SIZE;
596 for (i = 1; p < end; i++, p += 2048) {
597 lynx->rcv_pcl->buffer[i].control =
598 cpu_to_le32(PCL_CMD_RCV | PCL_BIGENDIAN | 2048);
599 lynx->rcv_pcl->buffer[i].pointer = cpu_to_le32(p);
600 }
601 lynx->rcv_pcl->buffer[i - 1].control |= cpu_to_le32(PCL_LAST_BUFF);
602
603 reg_set_bits(lynx, MISC_CONTROL, MISC_CONTROL_SWRESET);
604 /* Fix buggy cards with autoboot pin not tied low: */
605 reg_write(lynx, DMA0_CHAN_CTRL, 0);
606 reg_write(lynx, DMA_GLOBAL_REGISTER, 0x00 << 24);
607
608#if 0
609 /* now, looking for PHY register set */
610 if ((get_phy_reg(lynx, 2) & 0xe0) == 0xe0) {
611 lynx->phyic.reg_1394a = 1;
612 PRINT(KERN_INFO, lynx->id,
613 "found 1394a conform PHY (using extended register set)");
614 lynx->phyic.vendor = get_phy_vendorid(lynx);
615 lynx->phyic.product = get_phy_productid(lynx);
616 } else {
617 lynx->phyic.reg_1394a = 0;
618 PRINT(KERN_INFO, lynx->id, "found old 1394 PHY");
619 }
620#endif
621
622 /* Setup the general receive FIFO max size. */
623 reg_write(lynx, FIFO_SIZES, 255);
624
625 reg_set_bits(lynx, PCI_INT_ENABLE, PCI_INT_DMA_ALL);
626
627 reg_write(lynx, LINK_INT_ENABLE,
628 LINK_INT_PHY_TIME_OUT | LINK_INT_PHY_REG_RCVD |
629 LINK_INT_PHY_BUSRESET | LINK_INT_IT_STUCK |
630 LINK_INT_AT_STUCK | LINK_INT_SNTRJ |
631 LINK_INT_TC_ERR | LINK_INT_GRF_OVER_FLOW |
632 LINK_INT_ITF_UNDER_FLOW | LINK_INT_ATF_UNDER_FLOW);
633
634 /* Disable the L flag in self ID packets. */
635 set_phy_reg(lynx, 4, 0);
636
637 /* Put this baby into snoop mode */
638 reg_set_bits(lynx, LINK_CONTROL, LINK_CONTROL_SNOOP_ENABLE);
639
640 run_pcl(lynx, lynx->rcv_start_pcl_bus, 0);
641
642 if (request_irq(dev->irq, irq_handler, IRQF_SHARED,
643 driver_name, lynx)) {
644 dev_err(&dev->dev,
645 "Failed to allocate shared interrupt %d\n", dev->irq);
646 ret = -EIO;
647 goto fail_deallocate_buffers;
648 }
649
650 lynx->misc.parent = &dev->dev;
651 lynx->misc.minor = MISC_DYNAMIC_MINOR;
652 lynx->misc.name = "nosy";
653 lynx->misc.fops = &nosy_ops;
654
655 mutex_lock(&card_mutex);
656 ret = misc_register(&lynx->misc);
657 if (ret) {
658 dev_err(&dev->dev, "Failed to register misc char device\n");
659 mutex_unlock(&card_mutex);
660 goto fail_free_irq;
661 }
662 list_add_tail(&lynx->link, &card_list);
663 mutex_unlock(&card_mutex);
664
665 dev_info(&dev->dev,
666 "Initialized PCILynx IEEE1394 card, irq=%d\n", dev->irq);
667
668 return 0;
669
670fail_free_irq:
671 reg_write(lynx, PCI_INT_ENABLE, 0);
672 free_irq(lynx->pci_device->irq, lynx);
673
674fail_deallocate_buffers:
675 if (lynx->rcv_start_pcl)
676 dma_free_coherent(&lynx->pci_device->dev, sizeof(struct pcl),
677 lynx->rcv_start_pcl,
678 lynx->rcv_start_pcl_bus);
679 if (lynx->rcv_pcl)
680 dma_free_coherent(&lynx->pci_device->dev, sizeof(struct pcl),
681 lynx->rcv_pcl, lynx->rcv_pcl_bus);
682 if (lynx->rcv_buffer)
683 dma_free_coherent(&lynx->pci_device->dev, RCV_BUFFER_SIZE,
684 lynx->rcv_buffer, lynx->rcv_buffer_bus);
685 iounmap(lynx->registers);
686
687fail_deallocate_lynx:
688 kfree(lynx);
689
690fail_disable:
691 pci_disable_device(dev);
692
693 return ret;
694}
695
696static struct pci_device_id pci_table[] = {
697 {
698 .vendor = PCI_VENDOR_ID_TI,
699 .device = PCI_DEVICE_ID_TI_PCILYNX,
700 .subvendor = PCI_ANY_ID,
701 .subdevice = PCI_ANY_ID,
702 },
703 { } /* Terminating entry */
704};
705
706MODULE_DEVICE_TABLE(pci, pci_table);
707
708static struct pci_driver lynx_pci_driver = {
709 .name = driver_name,
710 .id_table = pci_table,
711 .probe = add_card,
712 .remove = remove_card,
713};
714
715module_pci_driver(lynx_pci_driver);
716
717MODULE_AUTHOR("Kristian Hoegsberg");
718MODULE_DESCRIPTION("Snoop mode driver for TI pcilynx 1394 controllers");
719MODULE_LICENSE("GPL");