aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/ramips/dts/mt7620a_iptime_a1004ns.dts
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/ramips/dts/mt7620a_iptime_a1004ns.dts')
0 files changed, 0 insertions, 0 deletions
generated by cgit v1.2.3 (git 2.25.1) at 2025-09-30 14:37:27 +0000
' href='#n62'>62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 
/******************************************************************************
 * common/trace.c
 *
 * Xen Trace Buffer
 *
 * Copyright (C) 2004 by Intel Research Cambridge
 *
 * Authors: Mark Williamson, mark.a.williamson@intel.com
 *          Rob Gardner, rob.gardner@hp.com
 * Date:    October 2005
 *
 * Copyright (C) 2005 Bin Ren
 *
 * The trace buffer code is designed to allow debugging traces of Xen to be
 * generated on UP / SMP machines.  Each trace entry is timestamped so that
 * it's possible to reconstruct a chronological record of trace events.
 */

#include <xen/config.h>
#include <asm/types.h>
#include <asm/io.h>
#include <xen/lib.h>
#include <xen/sched.h>
#include <xen/smp.h>
#include <xen/trace.h>
#include <xen/errno.h>
#include <xen/event.h>
#include <xen/softirq.h>
#include <xen/init.h>
#include <xen/mm.h>
#include <xen/percpu.h>
#include <asm/atomic.h>
#include <public/sysctl.h>

#ifdef CONFIG_COMPAT
#include <compat/trace.h>
#define xen_t_buf t_buf
CHECK_t_buf;
#undef xen_t_buf
#define TB_COMPAT IS_COMPAT(dom0)
#else
#define compat_t_rec t_rec
#define TB_COMPAT 0
#endif

/* opt_tbuf_size: trace buffer size (in pages) */
static unsigned int opt_tbuf_size = 0;
integer_param("tbuf_size", opt_tbuf_size);

/* Pointers to the meta-data objects for all system trace buffers */
static DEFINE_PER_CPU(struct t_buf *, t_bufs);
static DEFINE_PER_CPU(unsigned char *, t_data);
static int data_size;

/* High water mark for trace buffers; */
/* Send virtual interrupt when buffer level reaches this point */
static int t_buf_highwater;

/* Number of records lost due to per-CPU trace buffer being full. */
static DEFINE_PER_CPU(unsigned long, lost_records);

/* a flag recording whether initialization has been done */
/* or more properly, if the tbuf subsystem is enabled right now */
int tb_init_done __read_mostly;

/* which CPUs tracing is enabled on */
static cpumask_t tb_cpu_mask = CPU_MASK_ALL;

/* which tracing events are enabled */
static u32 tb_event_mask = TRC_ALL;

/**
 * alloc_trace_bufs - performs initialization of the per-cpu trace buffers.
 *
 * This function is called at start of day in order to initialize the per-cpu
 * trace buffers.  The trace buffers are then available for debugging use, via
 * the %TRACE_xD macros exported in <xen/trace.h>.
 *
 * This function may also be called later when enabling trace buffers 
 * via the SET_SIZE hypercall.
 */
static int alloc_trace_bufs(void)
{
    int           i, order;
    unsigned long nr_pages;
    char         *rawbuf;
    struct t_buf *buf;

    if ( opt_tbuf_size == 0 )
        return -EINVAL;

    nr_pages = num_online_cpus() * opt_tbuf_size;
    order    = get_order_from_pages(nr_pages);
    data_size  = (opt_tbuf_size * PAGE_SIZE - sizeof(struct t_buf));
    
    if ( (rawbuf = alloc_xenheap_pages(order)) == NULL )
    {
        printk("Xen trace buffers: memory allocation failed\n");
        opt_tbuf_size = 0;
        return -EINVAL;
    }

    /* Share pages so that xentrace can map them. */
    for ( i = 0; i < nr_pages; i++ )
        share_xen_page_with_privileged_guests(
            virt_to_page(rawbuf) + i, XENSHARE_writable);

    for_each_online_cpu ( i )
    {
        buf = per_cpu(t_bufs, i) = (struct t_buf *)
            &rawbuf[i*opt_tbuf_size*PAGE_SIZE];
        buf->cons = buf->prod = 0;
        per_cpu(t_data, i) = (unsigned char *)(buf + 1);
    }

    t_buf_highwater = data_size >> 1; /* 50% high water */

    return 0;
}


/**
 * tb_set_size - handle the logic involved with dynamically
 * allocating and deallocating tbufs
 *
 * This function is called when the SET_SIZE hypercall is done.
 */
static int tb_set_size(int size)
{
    /*
     * Setting size is a one-shot operation. It can be done either at
     * boot time or via control tools, but not by both. Once buffers
     * are created they cannot be destroyed.
     */
    if ( (opt_tbuf_size != 0) || (size <= 0) )
    {
        gdprintk(XENLOG_INFO, "tb_set_size from %d to %d not implemented\n",
                opt_tbuf_size, size);
        return -EINVAL;
    }

    opt_tbuf_size = size;
    if ( alloc_trace_bufs() != 0 )
        return -EINVAL;

    printk("Xen trace buffers: initialized\n");
    return 0;
}


/**
 * init_trace_bufs - performs initialization of the per-cpu trace buffers.
 *
 * This function is called at start of day in order to initialize the per-cpu
 * trace buffers.  The trace buffers are then available for debugging use, via
 * the %TRACE_xD macros exported in <xen/trace.h>.
 */
void __init init_trace_bufs(void)
{
    if ( opt_tbuf_size == 0 )
    {
        printk("Xen trace buffers: disabled\n");
        return;
    }

    if ( alloc_trace_bufs() == 0 )
    {
        printk("Xen trace buffers: initialised\n");
        wmb(); /* above must be visible before tb_init_done flag set */
        tb_init_done = 1;
    }
}

/**
 * tb_control - sysctl operations on trace buffers.
 * @tbc: a pointer to a xen_sysctl_tbuf_op_t to be filled out
 */
int tb_control(xen_sysctl_tbuf_op_t *tbc)
{
    static DEFINE_SPINLOCK(lock);
    int rc = 0;

    spin_lock(&lock);

    switch ( tbc->cmd )
    {
    case XEN_SYSCTL_TBUFOP_get_info:
        tbc->evt_mask   = tb_event_mask;
        tbc->buffer_mfn = opt_tbuf_size ? virt_to_mfn(per_cpu(t_bufs, 0)) : 0;
        tbc->size       = opt_tbuf_size * PAGE_SIZE;
        break;
    case XEN_SYSCTL_TBUFOP_set_cpu_mask:
        xenctl_cpumap_to_cpumask(&tb_cpu_mask, &tbc->cpu_mask);
        break;
    case XEN_SYSCTL_TBUFOP_set_evt_mask:
        tb_event_mask = tbc->evt_mask;
        break;
    case XEN_SYSCTL_TBUFOP_set_size:
        rc = !tb_init_done ? tb_set_size(tbc->size) : -EINVAL;
        break;
    case XEN_SYSCTL_TBUFOP_enable:
        /* Enable trace buffers. Check buffers are already allocated. */
        if ( opt_tbuf_size == 0 ) 
            rc = -EINVAL;
        else
            tb_init_done = 1;
        break;
    case XEN_SYSCTL_TBUFOP_disable:
        /*
         * Disable trace buffers. Just stops new records from being written,
         * does not deallocate any memory.
         */
        tb_init_done = 0;
        break;
    default:
        rc = -EINVAL;
        break;
    }

    spin_unlock(&lock);

    return rc;
}

static inline int calc_rec_size(int cycles, int extra) 
{
    int rec_size;
    rec_size = 4;
    if ( cycles )
        rec_size += 8;
    rec_size += extra;
    return rec_size;
}

static inline int calc_unconsumed_bytes(struct t_buf *buf)
{
    int x = buf->prod - buf->cons;
    if ( x < 0 )
        x += 2*data_size;

    ASSERT(x >= 0);
    ASSERT(x <= data_size);

    return x;
}

static inline int calc_bytes_to_wrap(struct t_buf *buf)
{
    int x = data_size - buf->prod;
    if ( x <= 0 )
        x += data_size;

    ASSERT(x > 0);
    ASSERT(x <= data_size);

    return x;
}

static inline int calc_bytes_avail(struct t_buf *buf)
{
    return data_size - calc_unconsumed_bytes(buf);
}

static inline struct t_rec *
next_record(struct t_buf *buf)
{
    int x = buf->prod;
    if ( x >= data_size )
        x -= data_size;

    ASSERT(x >= 0);
    ASSERT(x < data_size);

    return (struct t_rec *)&this_cpu(t_data)[x];
}

static inline int __insert_record(struct t_buf *buf,
                                  unsigned long event,
                                  int extra,
                                  int cycles,
                                  int rec_size,
                                  unsigned char *extra_data)
{
    struct t_rec *rec;
    unsigned char *dst;
    unsigned long extra_word = extra/sizeof(u32);
    int local_rec_size = calc_rec_size(cycles, extra);
    uint32_t next;

    BUG_ON(local_rec_size != rec_size);
    BUG_ON(extra & 3);

    /* Double-check once more that we have enough space.
     * Don't bugcheck here, in case the userland tool is doing
     * something stupid. */
    if ( calc_bytes_avail(buf) < rec_size )
    {
        printk("%s: %u bytes left (%u - ((%u - %u) %% %u) recsize %u.\n",
               __func__,
               calc_bytes_avail(buf),
               data_size, buf->prod, buf->cons, data_size, rec_size);
        return 0;
    }
    rmb();

    rec = next_record(buf);
    rec->event = event;
    rec->extra_u32 = extra_word;
    dst = (unsigned char *)rec->u.nocycles.extra_u32;
    if ( (rec->cycles_included = cycles) != 0 )
    {
        u64 tsc = (u64)get_cycles();
        rec->u.cycles.cycles_lo = (uint32_t)tsc;
        rec->u.cycles.cycles_hi = (uint32_t)(tsc >> 32);
        dst = (unsigned char *)rec->u.cycles.extra_u32;
    } 

    if ( extra_data && extra )
        memcpy(dst, extra_data, extra);

    wmb();

    next = buf->prod + rec_size;
    if ( next >= 2*data_size )
        next -= 2*data_size;
    ASSERT(next >= 0);
    ASSERT(next < 2*data_size);
    buf->prod = next;

    return rec_size;
}

static inline int insert_wrap_record(struct t_buf *buf, int size)
{
    int space_left = calc_bytes_to_wrap(buf);
    unsigned long extra_space = space_left - sizeof(u32);
    int cycles = 0;

    BUG_ON(space_left > size);

    /* We may need to add cycles to take up enough space... */
    if ( (extra_space/sizeof(u32)) > TRACE_EXTRA_MAX )
    {
        cycles = 1;
        extra_space -= sizeof(u64);
        ASSERT((extra_space/sizeof(u32)) <= TRACE_EXTRA_MAX);
    }

    return __insert_record(buf,
                    TRC_TRACE_WRAP_BUFFER,
                    extra_space,
                    cycles,
                    space_left,
                    NULL);
}

#define LOST_REC_SIZE 8

static inline int insert_lost_records(struct t_buf *buf)
{
    struct {
        u32 lost_records;
    } ed;

    ed.lost_records = this_cpu(lost_records);

    this_cpu(lost_records) = 0;

    return __insert_record(buf,
                           TRC_LOST_RECORDS,
                           sizeof(ed),
                           0 /* !cycles */,
                           LOST_REC_SIZE,
                           (unsigned char *)&ed);
}


/**
 * trace - Enters a trace tuple into the trace buffer for the current CPU.
 * @event: the event type being logged
 * @d1...d5: the data items for the event being logged
 *
 * Logs a trace record into the appropriate buffer.  Returns nonzero on
 * failure, otherwise 0.  Failure occurs only if the trace buffers are not yet
 * initialised.
 */
void __trace_var(u32 event, int cycles, int extra, unsigned char *extra_data)
{
    struct t_buf *buf;
    unsigned long flags, bytes_to_tail, bytes_to_wrap;
    int rec_size, total_size;
    int extra_word;
    int started_below_highwater;

    ASSERT(tb_init_done);

    /* Convert byte count into word count, rounding up */
    extra_word = (extra / sizeof(u32));
    if ( (extra % sizeof(u32)) != 0 )
        extra_word++;
    
    ASSERT(extra_word <= TRACE_EXTRA_MAX);
    extra_word = min_t(int, extra_word, TRACE_EXTRA_MAX);

    /* Round size up to nearest word */
    extra = extra_word * sizeof(u32);

    if ( (tb_event_mask & event) == 0 )
        return;

    /* match class */
    if ( ((tb_event_mask >> TRC_CLS_SHIFT) & (event >> TRC_CLS_SHIFT)) == 0 )
        return;

    /* then match subclass */
    if ( (((tb_event_mask >> TRC_SUBCLS_SHIFT) & 0xf )
                & ((event >> TRC_SUBCLS_SHIFT) & 0xf )) == 0 )
        return;

    if ( !cpu_isset(smp_processor_id(), tb_cpu_mask) )
        return;

    /* Read tb_init_done /before/ t_bufs. */
    rmb();

    buf = this_cpu(t_bufs);

    local_irq_save(flags);

    started_below_highwater = (calc_unconsumed_bytes(buf) < t_buf_highwater);

    /* Calculate the record size */
    rec_size = calc_rec_size(cycles, extra);
 
    /* How many bytes are available in the buffer? */
    bytes_to_tail = calc_bytes_avail(buf);
    
    /* How many bytes until the next wrap-around? */
    bytes_to_wrap = calc_bytes_to_wrap(buf);
    
    /* 
     * Calculate expected total size to commit this record by
     * doing a dry-run.
     */
    total_size = 0;

    /* First, check to see if we need to include a lost_record.
     */
    if ( this_cpu(lost_records) )
    {
        if ( LOST_REC_SIZE > bytes_to_wrap )
        {
            total_size += bytes_to_wrap;
            bytes_to_wrap = data_size;
        } 
        total_size += LOST_REC_SIZE;
        bytes_to_wrap -= LOST_REC_SIZE;

        /* LOST_REC might line up perfectly with the buffer wrap */
        if ( bytes_to_wrap == 0 )
            bytes_to_wrap = data_size;
    }

    if ( rec_size > bytes_to_wrap )
    {
        total_size += bytes_to_wrap;
    } 
    total_size += rec_size;

    /* Do we have enough space for everything? */
    if ( total_size > bytes_to_tail )
    {
        this_cpu(lost_records)++;
        local_irq_restore(flags);
        return;
    }

    /*
     * Now, actually write information 
     */
    bytes_to_wrap = calc_bytes_to_wrap(buf);

    if ( this_cpu(lost_records) )
    {
        if ( LOST_REC_SIZE > bytes_to_wrap )
        {
            insert_wrap_record(buf, LOST_REC_SIZE);
            bytes_to_wrap = data_size;
        } 
        insert_lost_records(buf);
        bytes_to_wrap -= LOST_REC_SIZE;

        /* LOST_REC might line up perfectly with the buffer wrap */
        if ( bytes_to_wrap == 0 )
            bytes_to_wrap = data_size;
    }

    if ( rec_size > bytes_to_wrap )
        insert_wrap_record(buf, rec_size);

    /* Write the original record */
    __insert_record(buf, event, extra, cycles, rec_size, extra_data);

    local_irq_restore(flags);

    /* Notify trace buffer consumer that we've crossed the high water mark. */
    if ( started_below_highwater &&
         (calc_unconsumed_bytes(buf) >= t_buf_highwater) )
        send_guest_global_virq(dom0, VIRQ_TBUF);
}

/*
 * Local variables:
 * mode: C
 * c-set-style: "BSD"
 * c-basic-offset: 4
 * tab-width: 4
 * indent-tabs-mode: nil
 * End:
 */