cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

accounting.h (4603B)

      1/*
      2 * QEMU System Emulator block accounting
      3 *
      4 * Copyright (c) 2011 Christoph Hellwig
      5 * Copyright (c) 2015 Igalia, S.L.
      6 *
      7 * Permission is hereby granted, free of charge, to any person obtaining a copy
      8 * of this software and associated documentation files (the "Software"), to deal
      9 * in the Software without restriction, including without limitation the rights
     10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     11 * copies of the Software, and to permit persons to whom the Software is
     12 * furnished to do so, subject to the following conditions:
     13 *
     14 * The above copyright notice and this permission notice shall be included in
     15 * all copies or substantial portions of the Software.
     16 *
     17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
     20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
     23 * THE SOFTWARE.
     24 */
     25#ifndef BLOCK_ACCOUNTING_H
     26#define BLOCK_ACCOUNTING_H
     27
     28#include "qemu/timed-average.h"
     29#include "qemu/thread.h"
     30#include "qapi/qapi-builtin-types.h"
     31
     32typedef struct BlockAcctTimedStats BlockAcctTimedStats;
     33typedef struct BlockAcctStats BlockAcctStats;
     34
     35enum BlockAcctType {
     36    BLOCK_ACCT_NONE = 0,
     37    BLOCK_ACCT_READ,
     38    BLOCK_ACCT_WRITE,
     39    BLOCK_ACCT_FLUSH,
     40    BLOCK_ACCT_UNMAP,
     41    BLOCK_MAX_IOTYPE,
     42};
     43
     44struct BlockAcctTimedStats {
     45    BlockAcctStats *stats;
     46    TimedAverage latency[BLOCK_MAX_IOTYPE];
     47    unsigned interval_length; /* in seconds */
     48    QSLIST_ENTRY(BlockAcctTimedStats) entries;
     49};
     50
     51typedef struct BlockLatencyHistogram {
     52    /* The following histogram is represented like this:
     53     *
     54     * 5|           *
     55     * 4|           *
     56     * 3| *         *
     57     * 2| *         *    *
     58     * 1| *    *    *    *
     59     *  +------------------
     60     *      10   50   100
     61     *
     62     * BlockLatencyHistogram histogram = {
     63     *     .nbins = 4,
     64     *     .boundaries = {10, 50, 100},
     65     *     .bins = {3, 1, 5, 2},
     66     * };
     67     *
     68     * @boundaries array define histogram intervals as follows:
     69     * [0, boundaries[0]), [boundaries[0], boundaries[1]), ...
     70     * [boundaries[nbins-2], +inf)
     71     *
     72     * So, for example above, histogram intervals are:
     73     * [0, 10), [10, 50), [50, 100), [100, +inf)
     74     */
     75    int nbins;
     76    uint64_t *boundaries; /* @nbins-1 numbers here
     77                             (all boundaries, except 0 and +inf) */
     78    uint64_t *bins;
     79} BlockLatencyHistogram;
     80
     81struct BlockAcctStats {
     82    QemuMutex lock;
     83    uint64_t nr_bytes[BLOCK_MAX_IOTYPE];
     84    uint64_t nr_ops[BLOCK_MAX_IOTYPE];
     85    uint64_t invalid_ops[BLOCK_MAX_IOTYPE];
     86    uint64_t failed_ops[BLOCK_MAX_IOTYPE];
     87    uint64_t total_time_ns[BLOCK_MAX_IOTYPE];
     88    uint64_t merged[BLOCK_MAX_IOTYPE];
     89    int64_t last_access_time_ns;
     90    QSLIST_HEAD(, BlockAcctTimedStats) intervals;
     91    bool account_invalid;
     92    bool account_failed;
     93    BlockLatencyHistogram latency_histogram[BLOCK_MAX_IOTYPE];
     94};
     95
     96typedef struct BlockAcctCookie {
     97    int64_t bytes;
     98    int64_t start_time_ns;
     99    enum BlockAcctType type;
    100} BlockAcctCookie;
    101
    102void block_acct_init(BlockAcctStats *stats);
    103void block_acct_setup(BlockAcctStats *stats, bool account_invalid,
    104                     bool account_failed);
    105void block_acct_cleanup(BlockAcctStats *stats);
    106void block_acct_add_interval(BlockAcctStats *stats, unsigned interval_length);
    107BlockAcctTimedStats *block_acct_interval_next(BlockAcctStats *stats,
    108                                              BlockAcctTimedStats *s);
    109void block_acct_start(BlockAcctStats *stats, BlockAcctCookie *cookie,
    110                      int64_t bytes, enum BlockAcctType type);
    111void block_acct_done(BlockAcctStats *stats, BlockAcctCookie *cookie);
    112void block_acct_failed(BlockAcctStats *stats, BlockAcctCookie *cookie);
    113void block_acct_invalid(BlockAcctStats *stats, enum BlockAcctType type);
    114void block_acct_merge_done(BlockAcctStats *stats, enum BlockAcctType type,
    115                           int num_requests);
    116int64_t block_acct_idle_time_ns(BlockAcctStats *stats);
    117double block_acct_queue_depth(BlockAcctTimedStats *stats,
    118                              enum BlockAcctType type);
    119int block_latency_histogram_set(BlockAcctStats *stats, enum BlockAcctType type,
    120                                uint64List *boundaries);
    121void block_latency_histograms_clear(BlockAcctStats *stats);
    122
    123#endif