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

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Message-ID: <CAM9d7cjs5Su824v+02rEWd5jgvt8tGsMmoXftXBsj-mTTU_xkA@mail.gmail.com>
Date:   Thu, 4 Feb 2021 21:32:43 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Alexander Antonov <alexander.antonov@...ux.intel.com>
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 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


> +               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
>