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    Subject[PATCH v2 08/15] tools lib traceevent: Add plugin for tlb_flush
    From: "Steven Rostedt (Red Hat)" <rostedt@goodmis.org>

    The tlb_flush tracepoints uses enums that are not yet known by
    the traceevent library. Add a plugin to handle that.

    Link: http://lore.kernel.org/linux-trace-devel/20200625100516.365338-9-tz.stoyanov@gmail.com

    Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
    [ Ported from trace-cmd.git ]
    Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
    Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
    ---
    tools/lib/traceevent/plugins/Build | 1 +
    tools/lib/traceevent/plugins/Makefile | 1 +
    tools/lib/traceevent/plugins/plugin_tlb.c | 81 +++++++++++++++++++++++
    3 files changed, 83 insertions(+)
    create mode 100644 tools/lib/traceevent/plugins/plugin_tlb.c

    diff --git a/tools/lib/traceevent/plugins/Build b/tools/lib/traceevent/plugins/Build
    index 210d26910613..b866f231a536 100644
    --- a/tools/lib/traceevent/plugins/Build
    +++ b/tools/lib/traceevent/plugins/Build
    @@ -8,3 +8,4 @@ plugin_function-y += plugin_function.o
    plugin_xen-y += plugin_xen.o
    plugin_scsi-y += plugin_scsi.o
    plugin_cfg80211-y += plugin_cfg80211.o
    +plugin_tlb-y += plugin_tlb.o
    \ No newline at end of file
    diff --git a/tools/lib/traceevent/plugins/Makefile b/tools/lib/traceevent/plugins/Makefile
    index 349bb81482ab..8e72707e8630 100644
    --- a/tools/lib/traceevent/plugins/Makefile
    +++ b/tools/lib/traceevent/plugins/Makefile
    @@ -137,6 +137,7 @@ PLUGINS += plugin_function.so
    PLUGINS += plugin_xen.so
    PLUGINS += plugin_scsi.so
    PLUGINS += plugin_cfg80211.so
    +PLUGINS += plugin_tlb.so

    PLUGINS := $(addprefix $(OUTPUT),$(PLUGINS))
    PLUGINS_IN := $(PLUGINS:.so=-in.o)
    diff --git a/tools/lib/traceevent/plugins/plugin_tlb.c b/tools/lib/traceevent/plugins/plugin_tlb.c
    new file mode 100644
    index 000000000000..1adade776306
    --- /dev/null
    +++ b/tools/lib/traceevent/plugins/plugin_tlb.c
    @@ -0,0 +1,81 @@
    +/*
    + * Copyright (C) 2015 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
    + *
    + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + * This program is free software; you can redistribute it and/or
    + * modify it under the terms of the GNU Lesser General Public
    + * License as published by the Free Software Foundation;
    + * version 2.1 of the License (not later!)
    + *
    + * This program is distributed in the hope that it will be useful,
    + * but WITHOUT ANY WARRANTY; without even the implied warranty of
    + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    + * GNU Lesser General Public License for more details.
    + *
    + * You should have received a copy of the GNU Lesser General Public
    + * License along with this program; if not, see <http://www.gnu.org/licenses>
    + *
    + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + */
    +#include <stdio.h>
    +#include <stdlib.h>
    +#include <string.h>
    +
    +#include "event-parse.h"
    +
    +enum tlb_flush_reason {
    + TLB_FLUSH_ON_TASK_SWITCH,
    + TLB_REMOTE_SHOOTDOWN,
    + TLB_LOCAL_SHOOTDOWN,
    + TLB_LOCAL_MM_SHOOTDOWN,
    + NR_TLB_FLUSH_REASONS,
    +};
    +
    +static int tlb_flush_handler(struct trace_seq *s, struct tep_record *record,
    + struct tep_event *event, void *context)
    +{
    + unsigned long long val;
    +
    + trace_seq_printf(s, "pages=");
    +
    + tep_print_num_field(s, "%ld", event, "pages", record, 1);
    +
    + if (tep_get_field_val(s, event, "reason", record, &val, 1) < 0)
    + return -1;
    +
    + trace_seq_puts(s, " reason=");
    +
    + switch (val) {
    + case TLB_FLUSH_ON_TASK_SWITCH:
    + trace_seq_puts(s, "flush on task switch");
    + break;
    + case TLB_REMOTE_SHOOTDOWN:
    + trace_seq_puts(s, "remote shootdown");
    + break;
    + case TLB_LOCAL_SHOOTDOWN:
    + trace_seq_puts(s, "local shootdown");
    + break;
    + case TLB_LOCAL_MM_SHOOTDOWN:
    + trace_seq_puts(s, "local mm shootdown");
    + break;
    + }
    +
    + trace_seq_printf(s, " (%lld)", val);
    +
    + return 0;
    +}
    +
    +int TEP_PLUGIN_LOADER(struct tep_handle *tep)
    +{
    + tep_register_event_handler(tep, -1, "tlb", "tlb_flush",
    + tlb_flush_handler, NULL);
    +
    + return 0;
    +}
    +
    +void TEP_PLUGIN_UNLOADER(struct tep_handle *tep)
    +{
    + tep_unregister_event_handler(tep, -1,
    + "tlb", "tlb_flush",
    + tlb_flush_handler, NULL);
    +}
    --
    2.26.2

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