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/*
* Copyright 2019 Google LLC
* SPDX-License-Identifier: MIT
*
* based in part on anv and radv which are:
* Copyright © 2015 Intel Corporation
* Copyright © 2016 Red Hat.
* Copyright © 2016 Bas Nieuwenhuizen
*/
#include "vn_common.h"
#include <stdarg.h>
#include <sys/syscall.h>
#include "util/log.h"
#include "util/os_misc.h"
#include "util/u_debug.h"
#include "venus-protocol/vn_protocol_driver_info.h"
#include "vk_enum_to_str.h"
#include "vn_ring.h"
#define VN_RELAX_MIN_BASE_SLEEP_US (160)
static const struct debug_control vn_debug_options[] = {
/* clang-format off */
{ "init", VN_DEBUG_INIT },
{ "result", VN_DEBUG_RESULT },
{ "vtest", VN_DEBUG_VTEST },
{ "wsi", VN_DEBUG_WSI },
{ "no_abort", VN_DEBUG_NO_ABORT },
{ "log_ctx_info", VN_DEBUG_LOG_CTX_INFO },
{ "cache", VN_DEBUG_CACHE },
{ NULL, 0 },
/* clang-format on */
};
static const struct debug_control vn_perf_options[] = {
/* clang-format off */
{ "no_async_set_alloc", VN_PERF_NO_ASYNC_SET_ALLOC },
{ "no_async_buffer_create", VN_PERF_NO_ASYNC_BUFFER_CREATE },
{ "no_async_queue_submit", VN_PERF_NO_ASYNC_QUEUE_SUBMIT },
{ "no_event_feedback", VN_PERF_NO_EVENT_FEEDBACK },
{ "no_fence_feedback", VN_PERF_NO_FENCE_FEEDBACK },
{ "no_memory_suballoc", VN_PERF_NO_MEMORY_SUBALLOC },
{ "no_cmd_batching", VN_PERF_NO_CMD_BATCHING },
{ "no_timeline_sem_feedback", VN_PERF_NO_TIMELINE_SEM_FEEDBACK },
{ NULL, 0 },
/* clang-format on */
};
struct vn_env vn_env;
static void
vn_env_init_once(void)
{
vn_env.debug =
parse_debug_string(os_get_option("VN_DEBUG"), vn_debug_options);
vn_env.perf =
parse_debug_string(os_get_option("VN_PERF"), vn_perf_options);
vn_env.draw_cmd_batch_limit =
debug_get_num_option("VN_DRAW_CMD_BATCH_LIMIT", UINT32_MAX);
if (!vn_env.draw_cmd_batch_limit)
vn_env.draw_cmd_batch_limit = UINT32_MAX;
vn_env.relax_base_sleep_us = debug_get_num_option(
"VN_RELAX_BASE_SLEEP_US", VN_RELAX_MIN_BASE_SLEEP_US);
}
void
vn_env_init(void)
{
static once_flag once = ONCE_FLAG_INIT;
call_once(&once, vn_env_init_once);
/* log per VkInstance creation */
if (VN_DEBUG(INIT)) {
vn_log(NULL,
"vn_env is as below:"
"\n\tdebug = 0x%" PRIx64 ""
"\n\tperf = 0x%" PRIx64 ""
"\n\tdraw_cmd_batch_limit = %u"
"\n\trelax_base_sleep_us = %u",
vn_env.debug, vn_env.perf, vn_env.draw_cmd_batch_limit,
vn_env.relax_base_sleep_us);
}
}
void
vn_trace_init(void)
{
#ifdef ANDROID
atrace_init();
#else
util_perfetto_init();
#endif
}
void
vn_log(struct vn_instance *instance, const char *format, ...)
{
va_list ap;
va_start(ap, format);
mesa_log_v(MESA_LOG_DEBUG, "MESA-VIRTIO", format, ap);
va_end(ap);
/* instance may be NULL or partially initialized */
}
VkResult
vn_log_result(struct vn_instance *instance,
VkResult result,
const char *where)
{
vn_log(instance, "%s: %s", where, vk_Result_to_str(result));
return result;
}
uint32_t
vn_extension_get_spec_version(const char *name)
{
const int32_t index = vn_info_extension_index(name);
return index >= 0 ? vn_info_extension_get(index)->spec_version : 0;
}
static bool
vn_ring_monitor_acquire(struct vn_ring *ring)
{
pid_t tid = syscall(SYS_gettid);
if (!ring->monitor.threadid && tid != ring->monitor.threadid &&
mtx_trylock(&ring->monitor.mutex) == thrd_success) {
/* register as the only waiting thread that monitors the ring. */
ring->monitor.threadid = tid;
}
return tid == ring->monitor.threadid;
}
void
vn_ring_monitor_release(struct vn_ring *ring)
{
if (syscall(SYS_gettid) != ring->monitor.threadid)
return;
ring->monitor.threadid = 0;
mtx_unlock(&ring->monitor.mutex);
}
struct vn_relax_state
vn_relax_init(struct vn_ring *ring, const char *reason)
{
if (ring->monitor.report_period_us) {
#ifndef NDEBUG
/* ensure minimum check period is greater than maximum renderer
* reporting period (with margin of safety to ensure no false
* positives).
*
* first_warn_time is pre-calculated based on parameters in vn_relax
* and must update together.
*/
const uint32_t first_warn_time = 3481600;
const uint32_t safety_margin = 250000;
assert(first_warn_time - safety_margin >=
ring->monitor.report_period_us);
#endif
if (vn_ring_monitor_acquire(ring)) {
ring->monitor.alive = true;
vn_ring_unset_status_bits(ring, VK_RING_STATUS_ALIVE_BIT_MESA);
}
}
return (struct vn_relax_state){
.ring = ring,
.iter = 0,
.reason = reason,
};
}
void
vn_relax(struct vn_relax_state *state)
{
struct vn_ring *ring = state->ring;
uint32_t *iter = &state->iter;
const char *reason = state->reason;
/* Yield for the first 2^busy_wait_order times and then sleep for
* base_sleep_us microseconds for the same number of times. After that,
* keep doubling both sleep length and count.
* Must also update pre-calculated "first_warn_time" in vn_relax_init().
*/
const uint32_t busy_wait_order = 8;
const uint32_t base_sleep_us = vn_env.relax_base_sleep_us;
const uint32_t warn_order = 12;
const uint32_t abort_order = 16;
(*iter)++;
if (*iter < (1 << busy_wait_order)) {
thrd_yield();
return;
}
/* warn occasionally if we have slept at least 1.28ms for 2048 times (plus
* another 2047 shorter sleeps)
*/
if (unlikely(*iter % (1 << warn_order) == 0)) {
vn_log(NULL, "stuck in %s wait with iter at %d", reason, *iter);
const uint32_t status = vn_ring_load_status(ring);
if (status & VK_RING_STATUS_FATAL_BIT_MESA) {
vn_log(NULL, "aborting on ring fatal error at iter %d", *iter);
abort();
}
if (ring->monitor.report_period_us) {
if (vn_ring_monitor_acquire(ring)) {
ring->monitor.alive = status & VK_RING_STATUS_ALIVE_BIT_MESA;
vn_ring_unset_status_bits(ring, VK_RING_STATUS_ALIVE_BIT_MESA);
}
if (!ring->monitor.alive && !VN_DEBUG(NO_ABORT)) {
vn_log(NULL, "aborting on expired ring alive status at iter %d",
*iter);
abort();
}
}
if (*iter >= (1 << abort_order) && !VN_DEBUG(NO_ABORT)) {
vn_log(NULL, "aborting");
abort();
}
}
const uint32_t shift = util_last_bit(*iter) - busy_wait_order - 1;
os_time_sleep(base_sleep_us << shift);
}
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