linux/drivers/macintosh/rack-meter.c
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   1/*
   2 * RackMac vu-meter driver
   3 *
   4 * (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp.
   5 *                    <benh@kernel.crashing.org>
   6 *
   7 * Released under the term of the GNU GPL v2.
   8 *
   9 * Support the CPU-meter LEDs of the Xserve G5
  10 *
  11 * TODO: Implement PWM to do variable intensity and provide userland
  12 * interface for fun. Also, the CPU-meter could be made nicer by being
  13 * a bit less "immediate" but giving instead a more average load over
  14 * time. Patches welcome :-)
  15 *
  16 */
  17#undef DEBUG
  18
  19#include <linux/types.h>
  20#include <linux/kernel.h>
  21#include <linux/slab.h>
  22#include <linux/device.h>
  23#include <linux/interrupt.h>
  24#include <linux/module.h>
  25#include <linux/pci.h>
  26#include <linux/dma-mapping.h>
  27#include <linux/kernel_stat.h>
  28
  29#include <asm/io.h>
  30#include <asm/prom.h>
  31#include <asm/machdep.h>
  32#include <asm/pmac_feature.h>
  33#include <asm/dbdma.h>
  34#include <asm/macio.h>
  35#include <asm/keylargo.h>
  36
  37/* Number of samples in a sample buffer */
  38#define SAMPLE_COUNT            256
  39
  40/* CPU meter sampling rate in ms */
  41#define CPU_SAMPLING_RATE       250
  42
  43struct rackmeter_dma {
  44        struct dbdma_cmd        cmd[4]                  ____cacheline_aligned;
  45        u32                     mark                    ____cacheline_aligned;
  46        u32                     buf1[SAMPLE_COUNT]      ____cacheline_aligned;
  47        u32                     buf2[SAMPLE_COUNT]      ____cacheline_aligned;
  48} ____cacheline_aligned;
  49
  50struct rackmeter_cpu {
  51        struct delayed_work     sniffer;
  52        struct rackmeter        *rm;
  53        cputime64_t             prev_wall;
  54        cputime64_t             prev_idle;
  55        int                     zero;
  56} ____cacheline_aligned;
  57
  58struct rackmeter {
  59        struct macio_dev                *mdev;
  60        unsigned int                    irq;
  61        struct device_node              *i2s;
  62        u8                              *ubuf;
  63        struct dbdma_regs __iomem       *dma_regs;
  64        void __iomem                    *i2s_regs;
  65        dma_addr_t                      dma_buf_p;
  66        struct rackmeter_dma            *dma_buf_v;
  67        int                             stale_irq;
  68        struct rackmeter_cpu            cpu[2];
  69        int                             paused;
  70        struct mutex                    sem;
  71};
  72
  73/* To be set as a tunable */
  74static int rackmeter_ignore_nice;
  75
  76/* This GPIO is whacked by the OS X driver when initializing */
  77#define RACKMETER_MAGIC_GPIO    0x78
  78
  79/* This is copied from cpufreq_ondemand, maybe we should put it in
  80 * a common header somewhere
  81 */
  82static inline cputime64_t get_cpu_idle_time(unsigned int cpu)
  83{
  84        u64 retval;
  85
  86        retval = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE] +
  87                 kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
  88
  89        if (rackmeter_ignore_nice)
  90                retval += kcpustat_cpu(cpu).cpustat[CPUTIME_NICE];
  91
  92        return retval;
  93}
  94
  95static void rackmeter_setup_i2s(struct rackmeter *rm)
  96{
  97        struct macio_chip *macio = rm->mdev->bus->chip;
  98
  99        /* First whack magic GPIO */
 100        pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, RACKMETER_MAGIC_GPIO, 5);
 101
 102
 103        /* Call feature code to enable the sound channel and the proper
 104         * clock sources
 105         */
 106        pmac_call_feature(PMAC_FTR_SOUND_CHIP_ENABLE, rm->i2s, 0, 1);
 107
 108        /* Power i2s and stop i2s clock. We whack MacIO FCRs directly for now.
 109         * This is a bit racy, thus we should add new platform functions to
 110         * handle that. snd-aoa needs that too
 111         */
 112        MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_ENABLE);
 113        MACIO_BIC(KEYLARGO_FCR1, KL1_I2S0_CLK_ENABLE_BIT);
 114        (void)MACIO_IN32(KEYLARGO_FCR1);
 115        udelay(10);
 116
 117        /* Then setup i2s. For now, we use the same magic value that
 118         * the OS X driver seems to use. We might want to play around
 119         * with the clock divisors later
 120         */
 121        out_le32(rm->i2s_regs + 0x10, 0x01fa0000);
 122        (void)in_le32(rm->i2s_regs + 0x10);
 123        udelay(10);
 124
 125        /* Fully restart i2s*/
 126        MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_CELL_ENABLE |
 127                  KL1_I2S0_CLK_ENABLE_BIT);
 128        (void)MACIO_IN32(KEYLARGO_FCR1);
 129        udelay(10);
 130}
 131
 132static void rackmeter_set_default_pattern(struct rackmeter *rm)
 133{
 134        int i;
 135
 136        for (i = 0; i < 16; i++) {
 137                if (i < 8)
 138                        rm->ubuf[i] = (i & 1) * 255;
 139                else
 140                        rm->ubuf[i] = ((~i) & 1) * 255;
 141        }
 142}
 143
 144static void rackmeter_do_pause(struct rackmeter *rm, int pause)
 145{
 146        struct rackmeter_dma *rdma = rm->dma_buf_v;
 147
 148        pr_debug("rackmeter: %s\n", pause ? "paused" : "started");
 149
 150        rm->paused = pause;
 151        if (pause) {
 152                DBDMA_DO_STOP(rm->dma_regs);
 153                return;
 154        }
 155        memset(rdma->buf1, 0, SAMPLE_COUNT & sizeof(u32));
 156        memset(rdma->buf2, 0, SAMPLE_COUNT & sizeof(u32));
 157
 158        rm->dma_buf_v->mark = 0;
 159
 160        mb();
 161        out_le32(&rm->dma_regs->cmdptr_hi, 0);
 162        out_le32(&rm->dma_regs->cmdptr, rm->dma_buf_p);
 163        out_le32(&rm->dma_regs->control, (RUN << 16) | RUN);
 164}
 165
 166static void rackmeter_setup_dbdma(struct rackmeter *rm)
 167{
 168        struct rackmeter_dma *db = rm->dma_buf_v;
 169        struct dbdma_cmd *cmd = db->cmd;
 170
 171        /* Make sure dbdma is reset */
 172        DBDMA_DO_RESET(rm->dma_regs);
 173
 174        pr_debug("rackmeter: mark offset=0x%zx\n",
 175                 offsetof(struct rackmeter_dma, mark));
 176        pr_debug("rackmeter: buf1 offset=0x%zx\n",
 177                 offsetof(struct rackmeter_dma, buf1));
 178        pr_debug("rackmeter: buf2 offset=0x%zx\n",
 179                 offsetof(struct rackmeter_dma, buf2));
 180
 181        /* Prepare 4 dbdma commands for the 2 buffers */
 182        memset(cmd, 0, 4 * sizeof(struct dbdma_cmd));
 183        st_le16(&cmd->req_count, 4);
 184        st_le16(&cmd->command, STORE_WORD | INTR_ALWAYS | KEY_SYSTEM);
 185        st_le32(&cmd->phy_addr, rm->dma_buf_p +
 186                offsetof(struct rackmeter_dma, mark));
 187        st_le32(&cmd->cmd_dep, 0x02000000);
 188        cmd++;
 189
 190        st_le16(&cmd->req_count, SAMPLE_COUNT * 4);
 191        st_le16(&cmd->command, OUTPUT_MORE);
 192        st_le32(&cmd->phy_addr, rm->dma_buf_p +
 193                offsetof(struct rackmeter_dma, buf1));
 194        cmd++;
 195
 196        st_le16(&cmd->req_count, 4);
 197        st_le16(&cmd->command, STORE_WORD | INTR_ALWAYS | KEY_SYSTEM);
 198        st_le32(&cmd->phy_addr, rm->dma_buf_p +
 199                offsetof(struct rackmeter_dma, mark));
 200        st_le32(&cmd->cmd_dep, 0x01000000);
 201        cmd++;
 202
 203        st_le16(&cmd->req_count, SAMPLE_COUNT * 4);
 204        st_le16(&cmd->command, OUTPUT_MORE | BR_ALWAYS);
 205        st_le32(&cmd->phy_addr, rm->dma_buf_p +
 206                offsetof(struct rackmeter_dma, buf2));
 207        st_le32(&cmd->cmd_dep, rm->dma_buf_p);
 208
 209        rackmeter_do_pause(rm, 0);
 210}
 211
 212static void rackmeter_do_timer(struct work_struct *work)
 213{
 214        struct rackmeter_cpu *rcpu =
 215                container_of(work, struct rackmeter_cpu, sniffer.work);
 216        struct rackmeter *rm = rcpu->rm;
 217        unsigned int cpu = smp_processor_id();
 218        cputime64_t cur_jiffies, total_idle_ticks;
 219        unsigned int total_ticks, idle_ticks;
 220        int i, offset, load, cumm, pause;
 221
 222        cur_jiffies = jiffies64_to_cputime64(get_jiffies_64());
 223        total_ticks = (unsigned int) (cur_jiffies - rcpu->prev_wall);
 224        rcpu->prev_wall = cur_jiffies;
 225
 226        total_idle_ticks = get_cpu_idle_time(cpu);
 227        idle_ticks = (unsigned int) (total_idle_ticks - rcpu->prev_idle);
 228        rcpu->prev_idle = total_idle_ticks;
 229
 230        /* We do a very dumb calculation to update the LEDs for now,
 231         * we'll do better once we have actual PWM implemented
 232         */
 233        load = (9 * (total_ticks - idle_ticks)) / total_ticks;
 234
 235        offset = cpu << 3;
 236        cumm = 0;
 237        for (i = 0; i < 8; i++) {
 238                u8 ub = (load > i) ? 0xff : 0;
 239                rm->ubuf[i + offset] = ub;
 240                cumm |= ub;
 241        }
 242        rcpu->zero = (cumm == 0);
 243
 244        /* Now check if LEDs are all 0, we can stop DMA */
 245        pause = (rm->cpu[0].zero && rm->cpu[1].zero);
 246        if (pause != rm->paused) {
 247                mutex_lock(&rm->sem);
 248                pause = (rm->cpu[0].zero && rm->cpu[1].zero);
 249                rackmeter_do_pause(rm, pause);
 250                mutex_unlock(&rm->sem);
 251        }
 252        schedule_delayed_work_on(cpu, &rcpu->sniffer,
 253                                 msecs_to_jiffies(CPU_SAMPLING_RATE));
 254}
 255
 256static void rackmeter_init_cpu_sniffer(struct rackmeter *rm)
 257{
 258        unsigned int cpu;
 259
 260        /* This driver works only with 1 or 2 CPUs numbered 0 and 1,
 261         * but that's really all we have on Apple Xserve. It doesn't
 262         * play very nice with CPU hotplug neither but we don't do that
 263         * on those machines yet
 264         */
 265
 266        rm->cpu[0].rm = rm;
 267        INIT_DELAYED_WORK(&rm->cpu[0].sniffer, rackmeter_do_timer);
 268        rm->cpu[1].rm = rm;
 269        INIT_DELAYED_WORK(&rm->cpu[1].sniffer, rackmeter_do_timer);
 270
 271        for_each_online_cpu(cpu) {
 272                struct rackmeter_cpu *rcpu;
 273
 274                if (cpu > 1)
 275                        continue;
 276                rcpu = &rm->cpu[cpu];
 277                rcpu->prev_idle = get_cpu_idle_time(cpu);
 278                rcpu->prev_wall = jiffies64_to_cputime64(get_jiffies_64());
 279                schedule_delayed_work_on(cpu, &rm->cpu[cpu].sniffer,
 280                                         msecs_to_jiffies(CPU_SAMPLING_RATE));
 281        }
 282}
 283
 284static void rackmeter_stop_cpu_sniffer(struct rackmeter *rm)
 285{
 286        cancel_delayed_work_sync(&rm->cpu[0].sniffer);
 287        cancel_delayed_work_sync(&rm->cpu[1].sniffer);
 288}
 289
 290static int rackmeter_setup(struct rackmeter *rm)
 291{
 292        pr_debug("rackmeter: setting up i2s..\n");
 293        rackmeter_setup_i2s(rm);
 294
 295        pr_debug("rackmeter: setting up default pattern..\n");
 296        rackmeter_set_default_pattern(rm);
 297
 298        pr_debug("rackmeter: setting up dbdma..\n");
 299        rackmeter_setup_dbdma(rm);
 300
 301        pr_debug("rackmeter: start CPU measurements..\n");
 302        rackmeter_init_cpu_sniffer(rm);
 303
 304        printk(KERN_INFO "RackMeter initialized\n");
 305
 306        return 0;
 307}
 308
 309/*  XXX FIXME: No PWM yet, this is 0/1 */
 310static u32 rackmeter_calc_sample(struct rackmeter *rm, unsigned int index)
 311{
 312        int led;
 313        u32 sample = 0;
 314
 315        for (led = 0; led < 16; led++) {
 316                sample >>= 1;
 317                sample |= ((rm->ubuf[led] >= 0x80) << 15);
 318        }
 319        return (sample << 17) | (sample >> 15);
 320}
 321
 322static irqreturn_t rackmeter_irq(int irq, void *arg)
 323{
 324        struct rackmeter *rm = arg;
 325        struct rackmeter_dma *db = rm->dma_buf_v;
 326        unsigned int mark, i;
 327        u32 *buf;
 328
 329        /* Flush PCI buffers with an MMIO read. Maybe we could actually
 330         * check the status one day ... in case things go wrong, though
 331         * this never happened to me
 332         */
 333        (void)in_le32(&rm->dma_regs->status);
 334
 335        /* Make sure the CPU gets us in order */
 336        rmb();
 337
 338        /* Read mark */
 339        mark = db->mark;
 340        if (mark != 1 && mark != 2) {
 341                printk(KERN_WARNING "rackmeter: Incorrect DMA mark 0x%08x\n",
 342                       mark);
 343                /* We allow for 3 errors like that (stale DBDMA irqs) */
 344                if (++rm->stale_irq > 3) {
 345                        printk(KERN_ERR "rackmeter: Too many errors,"
 346                               " stopping DMA\n");
 347                        DBDMA_DO_RESET(rm->dma_regs);
 348                }
 349                return IRQ_HANDLED;
 350        }
 351
 352        /* Next buffer we need to fill is mark value */
 353        buf = mark == 1 ? db->buf1 : db->buf2;
 354
 355        /* Fill it now. This routine converts the 8 bits depth sample array
 356         * into the PWM bitmap for each LED.
 357         */
 358        for (i = 0; i < SAMPLE_COUNT; i++)
 359                buf[i] = rackmeter_calc_sample(rm, i);
 360
 361
 362        return IRQ_HANDLED;
 363}
 364
 365static int rackmeter_probe(struct macio_dev* mdev,
 366                           const struct of_device_id *match)
 367{
 368        struct device_node *i2s = NULL, *np = NULL;
 369        struct rackmeter *rm = NULL;
 370        struct resource ri2s, rdma;
 371        int rc = -ENODEV;
 372
 373        pr_debug("rackmeter_probe()\n");
 374
 375        /* Get i2s-a node */
 376        while ((i2s = of_get_next_child(mdev->ofdev.dev.of_node, i2s)) != NULL)
 377               if (strcmp(i2s->name, "i2s-a") == 0)
 378                       break;
 379        if (i2s == NULL) {
 380                pr_debug("  i2s-a child not found\n");
 381                goto bail;
 382        }
 383        /* Get lightshow or virtual sound */
 384        while ((np = of_get_next_child(i2s, np)) != NULL) {
 385               if (strcmp(np->name, "lightshow") == 0)
 386                       break;
 387               if ((strcmp(np->name, "sound") == 0) &&
 388                   of_get_property(np, "virtual", NULL) != NULL)
 389                       break;
 390        }
 391        if (np == NULL) {
 392                pr_debug("  lightshow or sound+virtual child not found\n");
 393                goto bail;
 394        }
 395
 396        /* Create and initialize our instance data */
 397        rm = kzalloc(sizeof(struct rackmeter), GFP_KERNEL);
 398        if (rm == NULL) {
 399                printk(KERN_ERR "rackmeter: failed to allocate memory !\n");
 400                rc = -ENOMEM;
 401                goto bail_release;
 402        }
 403        rm->mdev = mdev;
 404        rm->i2s = i2s;
 405        mutex_init(&rm->sem);
 406        dev_set_drvdata(&mdev->ofdev.dev, rm);
 407        /* Check resources availability. We need at least resource 0 and 1 */
 408#if 0 /* Use that when i2s-a is finally an mdev per-se */
 409        if (macio_resource_count(mdev) < 2 || macio_irq_count(mdev) < 2) {
 410                printk(KERN_ERR
 411                       "rackmeter: found match but lacks resources: %s"
 412                       " (%d resources, %d interrupts)\n",
 413                       mdev->ofdev.node->full_name);
 414                rc = -ENXIO;
 415                goto bail_free;
 416        }
 417        if (macio_request_resources(mdev, "rackmeter")) {
 418                printk(KERN_ERR
 419                       "rackmeter: failed to request resources: %s\n",
 420                       mdev->ofdev.node->full_name);
 421                rc = -EBUSY;
 422                goto bail_free;
 423        }
 424        rm->irq = macio_irq(mdev, 1);
 425#else
 426        rm->irq = irq_of_parse_and_map(i2s, 1);
 427        if (rm->irq == NO_IRQ ||
 428            of_address_to_resource(i2s, 0, &ri2s) ||
 429            of_address_to_resource(i2s, 1, &rdma)) {
 430                printk(KERN_ERR
 431                       "rackmeter: found match but lacks resources: %s",
 432                       mdev->ofdev.dev.of_node->full_name);
 433                rc = -ENXIO;
 434                goto bail_free;
 435        }
 436#endif
 437
 438        pr_debug("  i2s @0x%08x\n", (unsigned int)ri2s.start);
 439        pr_debug("  dma @0x%08x\n", (unsigned int)rdma.start);
 440        pr_debug("  irq %d\n", rm->irq);
 441
 442        rm->ubuf = (u8 *)__get_free_page(GFP_KERNEL);
 443        if (rm->ubuf == NULL) {
 444                printk(KERN_ERR
 445                       "rackmeter: failed to allocate samples page !\n");
 446                rc = -ENOMEM;
 447                goto bail_release;
 448        }
 449
 450        rm->dma_buf_v = dma_alloc_coherent(&macio_get_pci_dev(mdev)->dev,
 451                                           sizeof(struct rackmeter_dma),
 452                                           &rm->dma_buf_p, GFP_KERNEL);
 453        if (rm->dma_buf_v == NULL) {
 454                printk(KERN_ERR
 455                       "rackmeter: failed to allocate dma buffer !\n");
 456                rc = -ENOMEM;
 457                goto bail_free_samples;
 458        }
 459#if 0
 460        rm->i2s_regs = ioremap(macio_resource_start(mdev, 0), 0x1000);
 461#else
 462        rm->i2s_regs = ioremap(ri2s.start, 0x1000);
 463#endif
 464        if (rm->i2s_regs == NULL) {
 465                printk(KERN_ERR
 466                       "rackmeter: failed to map i2s registers !\n");
 467                rc = -ENXIO;
 468                goto bail_free_dma;
 469        }
 470#if 0
 471        rm->dma_regs = ioremap(macio_resource_start(mdev, 1), 0x100);
 472#else
 473        rm->dma_regs = ioremap(rdma.start, 0x100);
 474#endif
 475        if (rm->dma_regs == NULL) {
 476                printk(KERN_ERR
 477                       "rackmeter: failed to map dma registers !\n");
 478                rc = -ENXIO;
 479                goto bail_unmap_i2s;
 480        }
 481
 482        rc = rackmeter_setup(rm);
 483        if (rc) {
 484                printk(KERN_ERR
 485                       "rackmeter: failed to initialize !\n");
 486                rc = -ENXIO;
 487                goto bail_unmap_dma;
 488        }
 489
 490        rc = request_irq(rm->irq, rackmeter_irq, 0, "rackmeter", rm);
 491        if (rc != 0) {
 492                printk(KERN_ERR
 493                       "rackmeter: failed to request interrupt !\n");
 494                goto bail_stop_dma;
 495        }
 496        of_node_put(np);
 497        return 0;
 498
 499 bail_stop_dma:
 500        DBDMA_DO_RESET(rm->dma_regs);
 501 bail_unmap_dma:
 502        iounmap(rm->dma_regs);
 503 bail_unmap_i2s:
 504        iounmap(rm->i2s_regs);
 505 bail_free_dma:
 506        dma_free_coherent(&macio_get_pci_dev(mdev)->dev,
 507                          sizeof(struct rackmeter_dma),
 508                          rm->dma_buf_v, rm->dma_buf_p);
 509 bail_free_samples:
 510        free_page((unsigned long)rm->ubuf);
 511 bail_release:
 512#if 0
 513        macio_release_resources(mdev);
 514#endif
 515 bail_free:
 516        kfree(rm);
 517 bail:
 518        of_node_put(i2s);
 519        of_node_put(np);
 520        dev_set_drvdata(&mdev->ofdev.dev, NULL);
 521        return rc;
 522}
 523
 524static int rackmeter_remove(struct macio_dev* mdev)
 525{
 526        struct rackmeter *rm = dev_get_drvdata(&mdev->ofdev.dev);
 527
 528        /* Stop CPU sniffer timer & work queues */
 529        rackmeter_stop_cpu_sniffer(rm);
 530
 531        /* Clear reference to private data */
 532        dev_set_drvdata(&mdev->ofdev.dev, NULL);
 533
 534        /* Stop/reset dbdma */
 535        DBDMA_DO_RESET(rm->dma_regs);
 536
 537        /* Release the IRQ */
 538        free_irq(rm->irq, rm);
 539
 540        /* Unmap registers */
 541        iounmap(rm->dma_regs);
 542        iounmap(rm->i2s_regs);
 543
 544        /* Free DMA */
 545        dma_free_coherent(&macio_get_pci_dev(mdev)->dev,
 546                          sizeof(struct rackmeter_dma),
 547                          rm->dma_buf_v, rm->dma_buf_p);
 548
 549        /* Free samples */
 550        free_page((unsigned long)rm->ubuf);
 551
 552#if 0
 553        /* Release resources */
 554        macio_release_resources(mdev);
 555#endif
 556
 557        /* Get rid of me */
 558        kfree(rm);
 559
 560        return 0;
 561}
 562
 563static int rackmeter_shutdown(struct macio_dev* mdev)
 564{
 565        struct rackmeter *rm = dev_get_drvdata(&mdev->ofdev.dev);
 566
 567        if (rm == NULL)
 568                return -ENODEV;
 569
 570        /* Stop CPU sniffer timer & work queues */
 571        rackmeter_stop_cpu_sniffer(rm);
 572
 573        /* Stop/reset dbdma */
 574        DBDMA_DO_RESET(rm->dma_regs);
 575
 576        return 0;
 577}
 578
 579static struct of_device_id rackmeter_match[] = {
 580        { .name = "i2s" },
 581        { }
 582};
 583
 584static struct macio_driver rackmeter_driver = {
 585        .driver = {
 586                .name = "rackmeter",
 587                .owner = THIS_MODULE,
 588                .of_match_table = rackmeter_match,
 589        },
 590        .probe = rackmeter_probe,
 591        .remove = rackmeter_remove,
 592        .shutdown = rackmeter_shutdown,
 593};
 594
 595
 596static int __init rackmeter_init(void)
 597{
 598        pr_debug("rackmeter_init()\n");
 599
 600        return macio_register_driver(&rackmeter_driver);
 601}
 602
 603static void __exit rackmeter_exit(void)
 604{
 605        pr_debug("rackmeter_exit()\n");
 606
 607        macio_unregister_driver(&rackmeter_driver);
 608}
 609
 610module_init(rackmeter_init);
 611module_exit(rackmeter_exit);
 612
 613
 614MODULE_LICENSE("GPL");
 615MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
 616MODULE_DESCRIPTION("RackMeter: Support vu-meter on XServe front panel");
 617
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