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/*
* Copyright (c) 2020 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "vppinfra/string.h"
#include <vnet/vnet.h>
#include <vlibapi/api.h>
#include <vlibmemory/api.h>
#include <vnet/plugin/plugin.h>
#include <vpp/app/version.h>
#include <linux/limits.h>
#include <sys/ioctl.h>
#include <perfmon/perfmon.h>
vlib_node_function_t *perfmon_dispatch_wrappers[PERF_MAX_EVENTS + 1];
static_always_inline void
perfmon_read_pmcs (u64 *counters, u32 *indexes, u8 n_counters)
{
for (int i = 0; i < n_counters; i++)
counters[i] = _rdpmc (indexes[i] - 1);
}
static_always_inline uword
perfmon_dispatch_wrapper_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
vlib_frame_t *frame, u8 n_events)
{
perfmon_main_t *pm = &perfmon_main;
perfmon_thread_runtime_t *rt =
vec_elt_at_index (pm->thread_runtimes, vm->thread_index);
perfmon_node_stats_t *s =
vec_elt_at_index (rt->node_stats, node->node_index);
struct
{
u64 t[2][PERF_MAX_EVENTS];
} samples;
uword rv;
clib_prefetch_load (s);
perfmon_read_pmcs (&samples.t[0][0], &rt->indexes[0], n_events);
rv = node->function (vm, node, frame);
perfmon_read_pmcs (&samples.t[1][0], &rt->indexes[0], n_events);
if (rv == 0)
return rv;
s->n_calls += 1;
s->n_packets += rv;
for (int i = 0; i < n_events; i++)
{
if (!(rt->preserve_samples & 1 << i))
{
s->value[i] += samples.t[1][i] - samples.t[0][i];
}
else
{
s->t[0].value[i] = samples.t[0][i];
s->t[1].value[i] = samples.t[1][i];
}
}
return rv;
}
static_always_inline u32
perfmon_mmap_read_index (const struct perf_event_mmap_page *mmap_page)
{
u32 idx;
u32 seq;
/* See documentation in /usr/include/linux/perf_event.h, for more details
* but the 2 main important things are:
* 1) if seq != mmap_page->lock, it means the kernel is currently updating
* the user page and we need to read it again
* 2) if idx == 0, it means the perf event is currently turned off and we
* just need to read the kernel-updated 'offset', otherwise we must also
* add the current hw value (hence rdmpc) */
do
{
seq = mmap_page->lock;
CLIB_COMPILER_BARRIER ();
idx = mmap_page->index;
CLIB_COMPILER_BARRIER ();
}
while (mmap_page->lock != seq);
return idx;
}
static_always_inline clib_error_t *
read_mmap_indexes (perfmon_bundle_t *b)
{
perfmon_main_t *pm = &perfmon_main;
for (int i = 0; i < vec_len (pm->thread_runtimes); i++)
{
perfmon_thread_runtime_t *tr;
tr = vec_elt_at_index (pm->thread_runtimes, i);
for (int j = 0; j < b->n_events; j++)
{
tr->indexes[j] = perfmon_mmap_read_index (tr->mmap_pages[j]);
/* if a zero index is returned generate error */
if (!tr->indexes[j])
{
return clib_error_return (0, "invalid rdpmc index");
}
}
}
return 0;
}
clib_error_t *
intel_config_dispatch_wrapper (perfmon_bundle_t *b,
vlib_node_function_t **dispatch_wrapper)
{
clib_error_t *err = 0;
if ((err = read_mmap_indexes (b)) != 0)
return err;
(*dispatch_wrapper) = perfmon_dispatch_wrappers[b->n_events];
return 0;
}
#define foreach_n_events \
_ (1) _ (2) _ (3) _ (4) _ (5) _ (6) _ (7) _ (8) _ (9) _ (10) _ (11) _ (12)
#define _(x) \
static uword perfmon_dispatch_wrapper##x ( \
vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame) \
{ \
return perfmon_dispatch_wrapper_inline (vm, node, frame, x); \
}
foreach_n_events
#undef _
vlib_node_function_t *perfmon_dispatch_wrappers[PERF_MAX_EVENTS + 1] = {
#define _(x) [x] = &perfmon_dispatch_wrapper##x,
foreach_n_events
#undef _
};
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