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/*
* nextpnr -- Next Generation Place and Route
*
* Copyright (C) 2021 gatecat <gatecat@ds0.me>
*
* 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 "json11.hpp"
#include "nextpnr.h"
NEXTPNR_NAMESPACE_BEGIN
using namespace json11;
namespace {
dict<IdString, std::pair<int, int>> get_utilization(const Context *ctx)
{
// Sort by Bel type
dict<IdString, std::pair<int, int>> result;
for (auto &cell : ctx->cells) {
result[ctx->getBelBucketName(ctx->getBelBucketForCellType(cell.second.get()->type))].first++;
}
for (auto bel : ctx->getBels()) {
if (!ctx->getBelHidden(bel)) {
result[ctx->getBelBucketName(ctx->getBelBucketForBel(bel))].second++;
}
}
return result;
}
} // namespace
static std::string clock_event_name(const Context *ctx, const ClockEvent &e)
{
std::string value;
if (e.clock == ctx->id("$async$"))
value = std::string("<async>");
else
value = (e.edge == FALLING_EDGE ? std::string("negedge ") : std::string("posedge ")) + e.clock.str(ctx);
return value;
};
static Json::array report_critical_paths(const Context *ctx)
{
auto report_critical_path = [ctx](const CriticalPath &report) {
Json::array pathJson;
for (const auto &segment : report.segments) {
const auto &driver = ctx->cells.at(segment.from.first);
const auto &sink = ctx->cells.at(segment.to.first);
auto fromLoc = ctx->getBelLocation(driver->bel);
auto toLoc = ctx->getBelLocation(sink->bel);
auto fromJson = Json::object({{"cell", segment.from.first.c_str(ctx)},
{"port", segment.from.second.c_str(ctx)},
{"loc", Json::array({fromLoc.x, fromLoc.y})}});
auto toJson = Json::object({{"cell", segment.to.first.c_str(ctx)},
{"port", segment.to.second.c_str(ctx)},
{"loc", Json::array({toLoc.x, toLoc.y})}});
auto segmentJson = Json::object({
{"delay", ctx->getDelayNS(segment.delay)},
{"from", fromJson},
{"to", toJson},
});
if (segment.type == CriticalPath::Segment::Type::CLK_TO_Q) {
segmentJson["type"] = "clk-to-q";
} else if (segment.type == CriticalPath::Segment::Type::SOURCE) {
segmentJson["type"] = "source";
} else if (segment.type == CriticalPath::Segment::Type::LOGIC) {
segmentJson["type"] = "logic";
} else if (segment.type == CriticalPath::Segment::Type::SETUP) {
segmentJson["type"] = "setup";
} else if (segment.type == CriticalPath::Segment::Type::ROUTING) {
segmentJson["type"] = "routing";
segmentJson["net"] = segment.net.c_str(ctx);
segmentJson["budget"] = ctx->getDelayNS(segment.budget);
}
pathJson.push_back(segmentJson);
}
return pathJson;
};
auto critPathsJson = Json::array();
// Critical paths
for (auto &report : ctx->timing_result.clock_paths) {
critPathsJson.push_back(Json::object({{"from", clock_event_name(ctx, report.second.clock_pair.start)},
{"to", clock_event_name(ctx, report.second.clock_pair.end)},
{"path", report_critical_path(report.second)}}));
}
// Cross-domain paths
for (auto &report : ctx->timing_result.xclock_paths) {
critPathsJson.push_back(Json::object({{"from", clock_event_name(ctx, report.clock_pair.start)},
{"to", clock_event_name(ctx, report.clock_pair.end)},
{"path", report_critical_path(report)}}));
}
return critPathsJson;
}
static Json::array report_detailed_net_timings(const Context *ctx)
{
auto detailedNetTimingsJson = Json::array();
// Detailed per-net timing analysis
for (const auto &it : ctx->timing_result.detailed_net_timings) {
const NetInfo *net = ctx->nets.at(it.first).get();
ClockEvent start = it.second[0].clock_pair.start;
Json::array endpointsJson;
for (const auto &sink_timing : it.second) {
// FIXME: Is it possible that there are multiple different start
// events for a single net? It has a single driver
NPNR_ASSERT(sink_timing.clock_pair.start == start);
auto endpointJson = Json::object({{"cell", sink_timing.cell_port.first.c_str(ctx)},
{"port", sink_timing.cell_port.second.c_str(ctx)},
{"event", clock_event_name(ctx, sink_timing.clock_pair.end)},
{"delay", ctx->getDelayNS(sink_timing.delay)},
{"budget", ctx->getDelayNS(sink_timing.budget)}});
endpointsJson.push_back(endpointJson);
}
auto netTimingJson = Json::object({{"net", net->name.c_str(ctx)},
{"driver", net->driver.cell->name.c_str(ctx)},
{"port", net->driver.port.c_str(ctx)},
{"event", clock_event_name(ctx, start)},
{"endpoints", endpointsJson}});
detailedNetTimingsJson.push_back(netTimingJson);
}
return detailedNetTimingsJson;
}
/*
Report JSON structure:
{
"utilization": {
<BEL name>: {
"available": <available count>,
"used": <used count>
},
...
},
"fmax" {
<clock name>: {
"achieved": <achieved fmax [MHz]>,
"constraint": <target fmax [MHz]>
},
...
},
"critical_paths": [
{
"from": <clock event edge and name>,
"to": <clock event edge and name>,
"path": [
{
"from": {
"cell": <driver cell name>
"port": <driver port name>
"loc": [
<grid x>,
<grid y>
]
},
"to": {
"cell": <sink cell name>
"port": <sink port name>
"loc": [
<grid x>,
<grid y>
]
},
"type": <path segment type "clk-to-q", "source", "logic", "routing" or "setup">,
"net": <net name (for routing only!)>,
"delay": <segment delay [ns]>,
"budget": <segment delay budget [ns] (for routing only!)>,
}
...
]
},
...
],
"detailed_net_timings": [
{
"driver": <driving cell name>,
"port": <driving cell port name>,
"event": <driver clock event name>,
"net": <net name>,
"endpoints": [
{
"cell": <sink cell name>,
"port": <sink cell port name>,
"event": <destination clock event name>,
"delay": <delay [ns]>,
"budget": <delay budget [ns]>,
}
...
]
}
...
]
}
*/
void Context::writeReport(std::ostream &out) const
{
auto util = get_utilization(this);
dict<std::string, Json> util_json;
for (const auto &kv : util) {
util_json[kv.first.str(this)] = Json::object{
{"used", kv.second.first},
{"available", kv.second.second},
};
}
dict<std::string, Json> fmax_json;
for (const auto &kv : timing_result.clock_fmax) {
fmax_json[kv.first.str(this)] = Json::object{
{"achieved", kv.second.achieved},
{"constraint", kv.second.constraint},
};
}
Json::object jsonRoot{
{"utilization", util_json}, {"fmax", fmax_json}, {"critical_paths", report_critical_paths(this)}};
if (detailed_timing_report) {
jsonRoot["detailed_net_timings"] = report_detailed_net_timings(this);
}
out << Json(jsonRoot).dump() << std::endl;
}
NEXTPNR_NAMESPACE_END
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