Root/drivers/firewire/nosy.c

1/*
2 * nosy - Snoop mode driver for TI PCILynx 1394 controllers
3 * Copyright (C) 2002-2007 Kristian Høgsberg
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software Foundation,
17 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 */
19
20#include <linux/device.h>
21#include <linux/errno.h>
22#include <linux/fs.h>
23#include <linux/init.h>
24#include <linux/interrupt.h>
25#include <linux/io.h>
26#include <linux/kernel.h>
27#include <linux/kref.h>
28#include <linux/miscdevice.h>
29#include <linux/module.h>
30#include <linux/mutex.h>
31#include <linux/pci.h>
32#include <linux/poll.h>
33#include <linux/sched.h> /* required for linux/wait.h */
34#include <linux/slab.h>
35#include <linux/spinlock.h>
36#include <linux/timex.h>
37#include <linux/uaccess.h>
38#include <linux/wait.h>
39#include <linux/dma-mapping.h>
40#include <linux/atomic.h>
41#include <asm/byteorder.h>
42
43#include "nosy.h"
44#include "nosy-user.h"
45
46#define TCODE_PHY_PACKET 0x10
47#define PCI_DEVICE_ID_TI_PCILYNX 0x8000
48
49static char driver_name[] = KBUILD_MODNAME;
50
51/* this is the physical layout of a PCL, its size is 128 bytes */
52struct pcl {
53    __le32 next;
54    __le32 async_error_next;
55    u32 user_data;
56    __le32 pcl_status;
57    __le32 remaining_transfer_count;
58    __le32 next_data_buffer;
59    struct {
60        __le32 control;
61        __le32 pointer;
62    } buffer[13];
63};
64
65struct packet {
66    unsigned int length;
67    char data[0];
68};
69
70struct packet_buffer {
71    char *data;
72    size_t capacity;
73    long total_packet_count, lost_packet_count;
74    atomic_t size;
75    struct packet *head, *tail;
76    wait_queue_head_t wait;
77};
78
79struct pcilynx {
80    struct pci_dev *pci_device;
81    __iomem char *registers;
82
83    struct pcl *rcv_start_pcl, *rcv_pcl;
84    __le32 *rcv_buffer;
85
86    dma_addr_t rcv_start_pcl_bus, rcv_pcl_bus, rcv_buffer_bus;
87
88    spinlock_t client_list_lock;
89    struct list_head client_list;
90
91    struct miscdevice misc;
92    struct list_head link;
93    struct kref kref;
94};
95
96static inline struct pcilynx *
97lynx_get(struct pcilynx *lynx)
98{
99    kref_get(&lynx->kref);
100
101    return lynx;
102}
103
104static void
105lynx_release(struct kref *kref)
106{
107    kfree(container_of(kref, struct pcilynx, kref));
108}
109
110static inline void
111lynx_put(struct pcilynx *lynx)
112{
113    kref_put(&lynx->kref, lynx_release);
114}
115
116struct client {
117    struct pcilynx *lynx;
118    u32 tcode_mask;
119    struct packet_buffer buffer;
120    struct list_head link;
121};
122
123static DEFINE_MUTEX(card_mutex);
124static LIST_HEAD(card_list);
125
126static int
127packet_buffer_init(struct packet_buffer *buffer, size_t capacity)
128{
129    buffer->data = kmalloc(capacity, GFP_KERNEL);
130    if (buffer->data == NULL)
131        return -ENOMEM;
132    buffer->head = (struct packet *) buffer->data;
133    buffer->tail = (struct packet *) buffer->data;
134    buffer->capacity = capacity;
135    buffer->lost_packet_count = 0;
136    atomic_set(&buffer->size, 0);
137    init_waitqueue_head(&buffer->wait);
138
139    return 0;
140}
141
142static void
143packet_buffer_destroy(struct packet_buffer *buffer)
144{
145    kfree(buffer->data);
146}
147
148static int
149packet_buffer_get(struct client *client, char __user *data, size_t user_length)
150{
151    struct packet_buffer *buffer = &client->buffer;
152    size_t length;
153    char *end;
154
155    if (wait_event_interruptible(buffer->wait,
156                     atomic_read(&buffer->size) > 0) ||
157                     list_empty(&client->lynx->link))
158        return -ERESTARTSYS;
159
160    if (atomic_read(&buffer->size) == 0)
161        return -ENODEV;
162
163    /* FIXME: Check length <= user_length. */
164
165    end = buffer->data + buffer->capacity;
166    length = buffer->head->length;
167
168    if (&buffer->head->data[length] < end) {
169        if (copy_to_user(data, buffer->head->data, length))
170            return -EFAULT;
171        buffer->head = (struct packet *) &buffer->head->data[length];
172    } else {
173        size_t split = end - buffer->head->data;
174
175        if (copy_to_user(data, buffer->head->data, split))
176            return -EFAULT;
177        if (copy_to_user(data + split, buffer->data, length - split))
178            return -EFAULT;
179        buffer->head = (struct packet *) &buffer->data[length - split];
180    }
181
182    /*
183     * Decrease buffer->size as the last thing, since this is what
184     * keeps the interrupt from overwriting the packet we are
185     * retrieving from the buffer.
186     */
187    atomic_sub(sizeof(struct packet) + length, &buffer->size);
188
189    return length;
190}
191
192static void
193packet_buffer_put(struct packet_buffer *buffer, void *data, size_t length)
194{
195    char *end;
196
197    buffer->total_packet_count++;
198
199    if (buffer->capacity <
200        atomic_read(&buffer->size) + sizeof(struct packet) + length) {
201        buffer->lost_packet_count++;
202        return;
203    }
204
205    end = buffer->data + buffer->capacity;
206    buffer->tail->length = length;
207
208    if (&buffer->tail->data[length] < end) {
209        memcpy(buffer->tail->data, data, length);
210        buffer->tail = (struct packet *) &buffer->tail->data[length];
211    } else {
212        size_t split = end - buffer->tail->data;
213
214        memcpy(buffer->tail->data, data, split);
215        memcpy(buffer->data, data + split, length - split);
216        buffer->tail = (struct packet *) &buffer->data[length - split];
217    }
218
219    /* Finally, adjust buffer size and wake up userspace reader. */
220
221    atomic_add(sizeof(struct packet) + length, &buffer->size);
222    wake_up_interruptible(&buffer->wait);
223}
224
225static inline void
226reg_write(struct pcilynx *lynx, int offset, u32 data)
227{
228    writel(data, lynx->registers + offset);
229}
230
231static inline u32
232reg_read(struct pcilynx *lynx, int offset)
233{
234    return readl(lynx->registers + offset);
235}
236
237static inline void
238reg_set_bits(struct pcilynx *lynx, int offset, u32 mask)
239{
240    reg_write(lynx, offset, (reg_read(lynx, offset) | mask));
241}
242
243/*
244 * Maybe the pcl programs could be set up to just append data instead
245 * of using a whole packet.
246 */
247static inline void
248run_pcl(struct pcilynx *lynx, dma_addr_t pcl_bus,
249               int dmachan)
250{
251    reg_write(lynx, DMA0_CURRENT_PCL + dmachan * 0x20, pcl_bus);
252    reg_write(lynx, DMA0_CHAN_CTRL + dmachan * 0x20,
253          DMA_CHAN_CTRL_ENABLE | DMA_CHAN_CTRL_LINK);
254}
255
256static int
257set_phy_reg(struct pcilynx *lynx, int addr, int val)
258{
259    if (addr > 15) {
260        dev_err(&lynx->pci_device->dev,
261            "PHY register address %d out of range\n", addr);
262        return -1;
263    }
264    if (val > 0xff) {
265        dev_err(&lynx->pci_device->dev,
266            "PHY register value %d out of range\n", val);
267        return -1;
268    }
269    reg_write(lynx, LINK_PHY, LINK_PHY_WRITE |
270          LINK_PHY_ADDR(addr) | LINK_PHY_WDATA(val));
271
272    return 0;
273}
274
275static int
276nosy_open(struct inode *inode, struct file *file)
277{
278    int minor = iminor(inode);
279    struct client *client;
280    struct pcilynx *tmp, *lynx = NULL;
281
282    mutex_lock(&card_mutex);
283    list_for_each_entry(tmp, &card_list, link)
284        if (tmp->misc.minor == minor) {
285            lynx = lynx_get(tmp);
286            break;
287        }
288    mutex_unlock(&card_mutex);
289    if (lynx == NULL)
290        return -ENODEV;
291
292    client = kmalloc(sizeof *client, GFP_KERNEL);
293    if (client == NULL)
294        goto fail;
295
296    client->tcode_mask = ~0;
297    client->lynx = lynx;
298    INIT_LIST_HEAD(&client->link);
299
300    if (packet_buffer_init(&client->buffer, 128 * 1024) < 0)
301        goto fail;
302
303    file->private_data = client;
304
305    return nonseekable_open(inode, file);
306fail:
307    kfree(client);
308    lynx_put(lynx);
309
310    return -ENOMEM;
311}
312
313static int
314nosy_release(struct inode *inode, struct file *file)
315{
316    struct client *client = file->private_data;
317    struct pcilynx *lynx = client->lynx;
318
319    spin_lock_irq(&lynx->client_list_lock);
320    list_del_init(&client->link);
321    spin_unlock_irq(&lynx->client_list_lock);
322
323    packet_buffer_destroy(&client->buffer);
324    kfree(client);
325    lynx_put(lynx);
326
327    return 0;
328}
329
330static unsigned int
331nosy_poll(struct file *file, poll_table *pt)
332{
333    struct client *client = file->private_data;
334    unsigned int ret = 0;
335
336    poll_wait(file, &client->buffer.wait, pt);
337
338    if (atomic_read(&client->buffer.size) > 0)
339        ret = POLLIN | POLLRDNORM;
340
341    if (list_empty(&client->lynx->link))
342        ret |= POLLHUP;
343
344    return ret;
345}
346
347static ssize_t
348nosy_read(struct file *file, char __user *buffer, size_t count, loff_t *offset)
349{
350    struct client *client = file->private_data;
351
352    return packet_buffer_get(client, buffer, count);
353}
354
355static long
356nosy_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
357{
358    struct client *client = file->private_data;
359    spinlock_t *client_list_lock = &client->lynx->client_list_lock;
360    struct nosy_stats stats;
361
362    switch (cmd) {
363    case NOSY_IOC_GET_STATS:
364        spin_lock_irq(client_list_lock);
365        stats.total_packet_count = client->buffer.total_packet_count;
366        stats.lost_packet_count = client->buffer.lost_packet_count;
367        spin_unlock_irq(client_list_lock);
368
369        if (copy_to_user((void __user *) arg, &stats, sizeof stats))
370            return -EFAULT;
371        else
372            return 0;
373
374    case NOSY_IOC_START:
375        spin_lock_irq(client_list_lock);
376        list_add_tail(&client->link, &client->lynx->client_list);
377        spin_unlock_irq(client_list_lock);
378
379        return 0;
380
381    case NOSY_IOC_STOP:
382        spin_lock_irq(client_list_lock);
383        list_del_init(&client->link);
384        spin_unlock_irq(client_list_lock);
385
386        return 0;
387
388    case NOSY_IOC_FILTER:
389        spin_lock_irq(client_list_lock);
390        client->tcode_mask = arg;
391        spin_unlock_irq(client_list_lock);
392
393        return 0;
394
395    default:
396        return -EINVAL;
397        /* Flush buffer, configure filter. */
398    }
399}
400
401static const struct file_operations nosy_ops = {
402    .owner = THIS_MODULE,
403    .read = nosy_read,
404    .unlocked_ioctl = nosy_ioctl,
405    .poll = nosy_poll,
406    .open = nosy_open,
407    .release = nosy_release,
408};
409
410#define PHY_PACKET_SIZE 12 /* 1 payload, 1 inverse, 1 ack = 3 quadlets */
411
412static void
413packet_irq_handler(struct pcilynx *lynx)
414{
415    struct client *client;
416    u32 tcode_mask, tcode;
417    size_t length;
418    struct timeval tv;
419
420    /* FIXME: Also report rcv_speed. */
421
422    length = __le32_to_cpu(lynx->rcv_pcl->pcl_status) & 0x00001fff;
423    tcode = __le32_to_cpu(lynx->rcv_buffer[1]) >> 4 & 0xf;
424
425    do_gettimeofday(&tv);
426    lynx->rcv_buffer[0] = (__force __le32)tv.tv_usec;
427
428    if (length == PHY_PACKET_SIZE)
429        tcode_mask = 1 << TCODE_PHY_PACKET;
430    else
431        tcode_mask = 1 << tcode;
432
433    spin_lock(&lynx->client_list_lock);
434
435    list_for_each_entry(client, &lynx->client_list, link)
436        if (client->tcode_mask & tcode_mask)
437            packet_buffer_put(&client->buffer,
438                      lynx->rcv_buffer, length + 4);
439
440    spin_unlock(&lynx->client_list_lock);
441}
442
443static void
444bus_reset_irq_handler(struct pcilynx *lynx)
445{
446    struct client *client;
447    struct timeval tv;
448
449    do_gettimeofday(&tv);
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, &tv.tv_usec, 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    pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
519                lynx->rcv_start_pcl, lynx->rcv_start_pcl_bus);
520    pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
521                lynx->rcv_pcl, lynx->rcv_pcl_bus);
522    pci_free_consistent(lynx->pci_device, PAGE_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
530#define RCV_BUFFER_SIZE (16 * 1024)
531
532static int __devinit
533add_card(struct pci_dev *dev, const struct pci_device_id *unused)
534{
535    struct pcilynx *lynx;
536    u32 p, end;
537    int ret, i;
538
539    if (pci_set_dma_mask(dev, DMA_BIT_MASK(32))) {
540        dev_err(&dev->dev,
541            "DMA address limits not supported for PCILynx hardware\n");
542        return -ENXIO;
543    }
544    if (pci_enable_device(dev)) {
545        dev_err(&dev->dev, "Failed to enable PCILynx hardware\n");
546        return -ENXIO;
547    }
548    pci_set_master(dev);
549
550    lynx = kzalloc(sizeof *lynx, GFP_KERNEL);
551    if (lynx == NULL) {
552        dev_err(&dev->dev, "Failed to allocate control structure\n");
553        ret = -ENOMEM;
554        goto fail_disable;
555    }
556    lynx->pci_device = dev;
557    pci_set_drvdata(dev, lynx);
558
559    spin_lock_init(&lynx->client_list_lock);
560    INIT_LIST_HEAD(&lynx->client_list);
561    kref_init(&lynx->kref);
562
563    lynx->registers = ioremap_nocache(pci_resource_start(dev, 0),
564                      PCILYNX_MAX_REGISTER);
565
566    lynx->rcv_start_pcl = pci_alloc_consistent(lynx->pci_device,
567                sizeof(struct pcl), &lynx->rcv_start_pcl_bus);
568    lynx->rcv_pcl = pci_alloc_consistent(lynx->pci_device,
569                sizeof(struct pcl), &lynx->rcv_pcl_bus);
570    lynx->rcv_buffer = pci_alloc_consistent(lynx->pci_device,
571                RCV_BUFFER_SIZE, &lynx->rcv_buffer_bus);
572    if (lynx->rcv_start_pcl == NULL ||
573        lynx->rcv_pcl == NULL ||
574        lynx->rcv_buffer == NULL) {
575        dev_err(&dev->dev, "Failed to allocate receive buffer\n");
576        ret = -ENOMEM;
577        goto fail_deallocate;
578    }
579    lynx->rcv_start_pcl->next = cpu_to_le32(lynx->rcv_pcl_bus);
580    lynx->rcv_pcl->next = cpu_to_le32(PCL_NEXT_INVALID);
581    lynx->rcv_pcl->async_error_next = cpu_to_le32(PCL_NEXT_INVALID);
582
583    lynx->rcv_pcl->buffer[0].control =
584            cpu_to_le32(PCL_CMD_RCV | PCL_BIGENDIAN | 2044);
585    lynx->rcv_pcl->buffer[0].pointer =
586            cpu_to_le32(lynx->rcv_buffer_bus + 4);
587    p = lynx->rcv_buffer_bus + 2048;
588    end = lynx->rcv_buffer_bus + RCV_BUFFER_SIZE;
589    for (i = 1; p < end; i++, p += 2048) {
590        lynx->rcv_pcl->buffer[i].control =
591            cpu_to_le32(PCL_CMD_RCV | PCL_BIGENDIAN | 2048);
592        lynx->rcv_pcl->buffer[i].pointer = cpu_to_le32(p);
593    }
594    lynx->rcv_pcl->buffer[i - 1].control |= cpu_to_le32(PCL_LAST_BUFF);
595
596    reg_set_bits(lynx, MISC_CONTROL, MISC_CONTROL_SWRESET);
597    /* Fix buggy cards with autoboot pin not tied low: */
598    reg_write(lynx, DMA0_CHAN_CTRL, 0);
599    reg_write(lynx, DMA_GLOBAL_REGISTER, 0x00 << 24);
600
601#if 0
602    /* now, looking for PHY register set */
603    if ((get_phy_reg(lynx, 2) & 0xe0) == 0xe0) {
604        lynx->phyic.reg_1394a = 1;
605        PRINT(KERN_INFO, lynx->id,
606              "found 1394a conform PHY (using extended register set)");
607        lynx->phyic.vendor = get_phy_vendorid(lynx);
608        lynx->phyic.product = get_phy_productid(lynx);
609    } else {
610        lynx->phyic.reg_1394a = 0;
611        PRINT(KERN_INFO, lynx->id, "found old 1394 PHY");
612    }
613#endif
614
615    /* Setup the general receive FIFO max size. */
616    reg_write(lynx, FIFO_SIZES, 255);
617
618    reg_set_bits(lynx, PCI_INT_ENABLE, PCI_INT_DMA_ALL);
619
620    reg_write(lynx, LINK_INT_ENABLE,
621          LINK_INT_PHY_TIME_OUT | LINK_INT_PHY_REG_RCVD |
622          LINK_INT_PHY_BUSRESET | LINK_INT_IT_STUCK |
623          LINK_INT_AT_STUCK | LINK_INT_SNTRJ |
624          LINK_INT_TC_ERR | LINK_INT_GRF_OVER_FLOW |
625          LINK_INT_ITF_UNDER_FLOW | LINK_INT_ATF_UNDER_FLOW);
626
627    /* Disable the L flag in self ID packets. */
628    set_phy_reg(lynx, 4, 0);
629
630    /* Put this baby into snoop mode */
631    reg_set_bits(lynx, LINK_CONTROL, LINK_CONTROL_SNOOP_ENABLE);
632
633    run_pcl(lynx, lynx->rcv_start_pcl_bus, 0);
634
635    if (request_irq(dev->irq, irq_handler, IRQF_SHARED,
636            driver_name, lynx)) {
637        dev_err(&dev->dev,
638            "Failed to allocate shared interrupt %d\n", dev->irq);
639        ret = -EIO;
640        goto fail_deallocate;
641    }
642
643    lynx->misc.parent = &dev->dev;
644    lynx->misc.minor = MISC_DYNAMIC_MINOR;
645    lynx->misc.name = "nosy";
646    lynx->misc.fops = &nosy_ops;
647
648    mutex_lock(&card_mutex);
649    ret = misc_register(&lynx->misc);
650    if (ret) {
651        dev_err(&dev->dev, "Failed to register misc char device\n");
652        mutex_unlock(&card_mutex);
653        goto fail_free_irq;
654    }
655    list_add_tail(&lynx->link, &card_list);
656    mutex_unlock(&card_mutex);
657
658    dev_info(&dev->dev,
659         "Initialized PCILynx IEEE1394 card, irq=%d\n", dev->irq);
660
661    return 0;
662
663fail_free_irq:
664    reg_write(lynx, PCI_INT_ENABLE, 0);
665    free_irq(lynx->pci_device->irq, lynx);
666
667fail_deallocate:
668    if (lynx->rcv_start_pcl)
669        pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
670                lynx->rcv_start_pcl, lynx->rcv_start_pcl_bus);
671    if (lynx->rcv_pcl)
672        pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
673                lynx->rcv_pcl, lynx->rcv_pcl_bus);
674    if (lynx->rcv_buffer)
675        pci_free_consistent(lynx->pci_device, PAGE_SIZE,
676                lynx->rcv_buffer, lynx->rcv_buffer_bus);
677    iounmap(lynx->registers);
678    kfree(lynx);
679
680fail_disable:
681    pci_disable_device(dev);
682
683    return ret;
684}
685
686static struct pci_device_id pci_table[] __devinitdata = {
687    {
688        .vendor = PCI_VENDOR_ID_TI,
689        .device = PCI_DEVICE_ID_TI_PCILYNX,
690        .subvendor = PCI_ANY_ID,
691        .subdevice = PCI_ANY_ID,
692    },
693    { } /* Terminating entry */
694};
695
696MODULE_DEVICE_TABLE(pci, pci_table);
697
698static struct pci_driver lynx_pci_driver = {
699    .name = driver_name,
700    .id_table = pci_table,
701    .probe = add_card,
702    .remove = remove_card,
703};
704
705module_pci_driver(lynx_pci_driver);
706
707MODULE_AUTHOR("Kristian Hoegsberg");
708MODULE_DESCRIPTION("Snoop mode driver for TI pcilynx 1394 controllers");
709MODULE_LICENSE("GPL");
710

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