linux-kernel - Re: [PATCH v4 3/5] perf stat: Helper functions for PCIe root ports list in iostat mode

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Date:   Mon, 8 Feb 2021 14:58:17 +0300
From:   Alexander Antonov <alexander.antonov@...ux.intel.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Jiri Olsa <jolsa@...hat.com>, Andi Kleen <ak@...ux.intel.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Mark Rutland <mark.rutland@....com>,
        Ian Rogers <irogers@...gle.com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v4 3/5] perf stat: Helper functions for PCIe root ports
 list in iostat mode


On 2/4/2021 3:32 PM, Namhyung Kim wrote:
> On Wed, Feb 3, 2021 at 10:58 PM Alexander Antonov
> <alexander.antonov@...ux.intel.com> wrote:
>> Introduce helper functions to control PCIe root ports list.
>> These helpers will be used in the follow-up patch.
>>
>> Signed-off-by: Alexander Antonov <alexander.antonov@...ux.intel.com>
>> ---
>>   tools/perf/arch/x86/util/iostat.c | 124 ++++++++++++++++++++++++++++++
>>   1 file changed, 124 insertions(+)
>>   create mode 100644 tools/perf/arch/x86/util/iostat.c
>>
>> diff --git a/tools/perf/arch/x86/util/iostat.c b/tools/perf/arch/x86/util/iostat.c
>> new file mode 100644
>> index 000000000000..961e540106e6
>> --- /dev/null
>> +++ b/tools/perf/arch/x86/util/iostat.c
>> @@ -0,0 +1,124 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * perf iostat
>> + *
>> + * Copyright (C) 2020, Intel Corporation
>> + *
>> + * Authors: Alexander Antonov <alexander.antonov@...ux.intel.com>
>> + */
>> +
>> +#include <api/fs/fs.h>
>> +#include <linux/kernel.h>
>> +#include <linux/err.h>
>> +#include <limits.h>
>> +#include <stdio.h>
>> +#include <string.h>
>> +#include <errno.h>
>> +#include <sys/types.h>
>> +#include <sys/stat.h>
>> +#include <fcntl.h>
>> +#include <dirent.h>
>> +#include <unistd.h>
>> +#include <stdlib.h>
>> +#include <regex.h>
>> +#include "util/cpumap.h"
>> +#include "util/debug.h"
>> +#include "util/iostat.h"
>> +#include "util/counts.h"
>> +#include "path.h"
>> +
>> +struct iio_root_port {
>> +       u32 domain;
>> +       u8 bus;
>> +       u8 die;
>> +       u8 pmu_idx;
>> +       int idx;
>> +};
>> +
>> +struct iio_root_ports_list {
>> +       struct iio_root_port **rps;
>> +       int nr_entries;
>> +};
>> +
>> +static void iio_root_port_show(FILE *output,
>> +                              const struct iio_root_port * const rp)
>> +{
>> +       if (output && rp)
>> +               fprintf(output, "S%d-uncore_iio_%d<%04x:%02x>\n",
>> +                       rp->die, rp->pmu_idx, rp->domain, rp->bus);
>> +}
>> +
>> +static struct iio_root_port *iio_root_port_new(u32 domain, u8 bus,
>> +                                              u8 die, u8 pmu_idx)
>> +{
>> +       struct iio_root_port *p = calloc(1, sizeof(*p));
>> +
>> +       if (p) {
>> +               p->domain = domain;
>> +               p->bus = bus;
>> +               p->die = die;
>> +               p->pmu_idx = pmu_idx;
>> +       }
>> +       return p;
>> +}
>> +
>> +static struct iio_root_ports_list *iio_root_ports_list_new(void)
>> +{
>> +       struct iio_root_ports_list *list = calloc(1, sizeof(*list));
>> +
>> +       if (list) {
>> +               list->rps = calloc(1, sizeof(struct iio_root_port *));
> This seems unnecessary now.
>
> Thanks,
> Namhyung
>

Yes, you are right. Will be fixed.

Thank you,
Alexander
>> +               if (!list->rps) {
>> +                       free(list);
>> +                       list = NULL;
>> +               }
>> +       }
>> +       return list;
>> +}
>> +
>> +static void iio_root_ports_list_free(struct iio_root_ports_list *list)
>> +{
>> +       int idx;
>> +
>> +       if (list) {
>> +               for (idx = 0; idx < list->nr_entries; idx++)
>> +                       free(list->rps[idx]);
>> +               free(list->rps);
>> +               free(list);
>> +       }
>> +}
>> +
>> +static struct iio_root_port *iio_root_port_find_by_notation(
>> +       const struct iio_root_ports_list * const list, u32 domain, u8 bus)
>> +{
>> +       int idx;
>> +       struct iio_root_port *rp;
>> +
>> +       if (list) {
>> +               for (idx = 0; idx < list->nr_entries; idx++) {
>> +                       rp = list->rps[idx];
>> +                       if (rp && rp->domain == domain && rp->bus == bus)
>> +                               return rp;
>> +               }
>> +       }
>> +       return NULL;
>> +}
>> +
>> +static int iio_root_ports_list_insert(struct iio_root_ports_list *list,
>> +                                     struct iio_root_port * const rp)
>> +{
>> +       struct iio_root_port **tmp_buf;
>> +
>> +       if (list && rp) {
>> +               rp->idx = list->nr_entries++;
>> +               tmp_buf = realloc(list->rps,
>> +                                 list->nr_entries * sizeof(*list->rps));
>> +               if (!tmp_buf) {
>> +                       pr_err("Failed to realloc memory\n");
>> +                       return -ENOMEM;
>> +               }
>> +               tmp_buf[rp->idx] = rp;
>> +               list->rps = tmp_buf;
>> +       }
>> +       return 0;
>> +}
>> --
>> 2.19.1
>>