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/*
* nextpnr -- Next Generation Place and Route
*
* Copyright (C) 2018 David Shah <david@symbioticeda.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include "timing.h"
#include <algorithm>
#include <unordered_map>
#include <utility>
#include "log.h"
#include "util.h"
NEXTPNR_NAMESPACE_BEGIN
typedef std::unordered_map<const PortInfo*, delay_t> UpdateMap;
static delay_t follow_net(Context *ctx, NetInfo *net, int path_length, delay_t slack, UpdateMap &updates, delay_t &min_slack);
// Follow a path, returning budget to annotate
static delay_t follow_user_port(Context *ctx, PortRef &user, int path_length, delay_t slack, UpdateMap &updates, delay_t &min_slack)
{
delay_t value;
if (ctx->getPortClock(user.cell, user.port) != IdString()) {
// At the end of a timing path (arguably, should check setup time
// here too)
value = slack / path_length;
min_slack = std::min(min_slack, value);
} else {
// Default to the path ending here, if no further paths found
value = slack / path_length;
// Follow outputs of the user
for (auto port : user.cell->ports) {
if (port.second.type == PORT_OUT) {
delay_t comb_delay;
// Look up delay through this path
bool is_path = ctx->getCellDelay(user.cell, user.port, port.first, comb_delay);
if (is_path) {
NetInfo *net = port.second.net;
if (net) {
delay_t path_budget = follow_net(ctx, net, path_length, slack - comb_delay, updates, min_slack);
value = std::min(value, path_budget);
}
}
}
}
}
auto ret = updates.emplace(&user.cell->ports.at(user.port), value);
if (!ret.second && value < ret.first->second) {
ret.first->second = value;
}
return value;
}
static delay_t follow_net(Context *ctx, NetInfo *net, int path_length, delay_t slack, UpdateMap &updates, delay_t &min_slack)
{
delay_t net_budget = slack / (path_length + 1);
for (unsigned i = 0; i < net->users.size(); ++i) {
auto &usr = net->users[i];
net_budget = std::min(net_budget, follow_user_port(ctx, usr, path_length + 1, slack - ctx->getNetinfoRouteDelay(net, i), updates, min_slack));
}
return net_budget;
}
void assign_budget(Context *ctx)
{
UpdateMap updates;
delay_t min_slack = delay_t(1.0e12 / ctx->target_freq);
log_break();
log_info("Annotating ports with timing budgets\n");
// Clear delays to a very high value first
delay_t default_slack = delay_t(1.0e12 / ctx->target_freq);
for (auto &net : ctx->nets) {
for (auto &usr : net.second->users) {
usr.budget = default_slack;
}
}
min_slack = default_slack;
// Go through all clocked drivers and set up paths
for (auto &cell : ctx->cells) {
for (auto port : cell.second->ports) {
if (port.second.type == PORT_OUT) {
IdString clock_domain = ctx->getPortClock(cell.second.get(), port.first);
if (clock_domain != IdString()) {
delay_t slack = delay_t(1.0e12 / ctx->target_freq); // TODO: clock constraints
delay_t clkToQ;
if (ctx->getCellDelay(cell.second.get(), clock_domain, port.first, clkToQ))
slack -= clkToQ;
if (port.second.net) {
log_break();
follow_net(ctx, port.second.net, 0, slack, updates, min_slack);
}
}
}
}
}
if (!ctx->user_freq) {
ctx->target_freq = delay_t(1e12 / (default_slack - min_slack));
if (ctx->verbose)
log_info("minimum slack for this assign = %d, target Fmax for next update = %f\n", min_slack, ctx->target_freq/1e6);
}
// Update the budgets
for (auto &net : ctx->nets) {
for (size_t i = 0; i < net.second->users.size(); ++i) {
auto& user = net.second->users[i];
auto pi = &user.cell->ports.at(user.port);
auto it = updates.find(pi);
if (it == updates.end()) continue;
auto budget = ctx->getNetinfoRouteDelay(net.second.get(), i) + it->second;
user.budget = ctx->getBudgetOverride(net.second->driver, budget);
// Post-update check
if (user.budget < 0)
log_warning("port %s.%s, connected to net '%s', has negative "
"timing budget of %fns\n",
user.cell->name.c_str(ctx), user.port.c_str(ctx), net.first.c_str(ctx),
ctx->getDelayNS(user.budget));
if (ctx->verbose)
log_info("port %s.%s, connected to net '%s', has "
"timing budget of %fns\n",
user.cell->name.c_str(ctx), user.port.c_str(ctx), net.first.c_str(ctx),
ctx->getDelayNS(user.budget));
}
}
log_info("Checksum: 0x%08x\n", ctx->checksum());
}
void update_budget(Context *ctx)
{
UpdateMap updates;
delay_t default_slack = delay_t(1.0e12 / ctx->target_freq);
delay_t min_slack = delay_t(1.0e12 / ctx->target_freq);
// Go through all clocked drivers and distribute the available path slack evenly into every budget
for (auto &cell : ctx->cells) {
for (auto& port : cell.second->ports) {
if (port.second.type == PORT_OUT) {
IdString clock_domain = ctx->getPortClock(cell.second.get(), port.first);
if (clock_domain != IdString()) {
delay_t slack = default_slack; // TODO: clock constraints
delay_t clkToQ;
if (ctx->getCellDelay(cell.second.get(), clock_domain, port.first, clkToQ))
slack -= clkToQ;
if (port.second.net)
follow_net(ctx, port.second.net, 0, slack, updates, min_slack);
}
}
}
}
if (!ctx->user_freq) {
ctx->target_freq = delay_t(1e12 / (default_slack - min_slack));
if (ctx->verbose)
log_info("minimum slack for this update = %d, target Fmax for next update = %f\n", min_slack, ctx->target_freq/1e6);
}
// Update the budgets
for (auto &net : ctx->nets) {
for (size_t i = 0; i < net.second->users.size(); ++i) {
auto& user = net.second->users[i];
auto pi = &user.cell->ports.at(user.port);
auto it = updates.find(pi);
if (it == updates.end()) continue;
auto budget = ctx->getNetinfoRouteDelay(net.second.get(), i) + it->second;
user.budget = ctx->getBudgetOverride(net.second->driver, budget);
// Post-update check
if (ctx->verbose) {
if (user.budget < 0)
log_warning("port %s.%s, connected to net '%s', has negative "
"timing budget of %fns\n",
user.cell->name.c_str(ctx), user.port.c_str(ctx), net.first.c_str(ctx),
ctx->getDelayNS(user.budget));
else
log_info("port %s.%s, connected to net '%s', has "
"timing budget of %fns\n",
user.cell->name.c_str(ctx), user.port.c_str(ctx), net.first.c_str(ctx),
ctx->getDelayNS(user.budget));
}
}
}
}
NEXTPNR_NAMESPACE_END
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