summaryrefslogtreecommitdiffstats
path: root/src/video_core/query_cache.h
blob: cd339b99de57fb375b4a77acbd85a4ef5748353f (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
// SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later

#pragma once

#include <algorithm>
#include <array>
#include <cstring>
#include <iterator>
#include <list>
#include <memory>
#include <mutex>
#include <optional>
#include <unordered_map>
#include <unordered_set>
#include <vector>

#include "common/assert.h"
#include "common/settings.h"
#include "video_core/control/channel_state_cache.h"
#include "video_core/engines/maxwell_3d.h"
#include "video_core/memory_manager.h"
#include "video_core/rasterizer_interface.h"

namespace VideoCommon {

template <class QueryCache, class HostCounter>
class CounterStreamBase {
public:
    explicit CounterStreamBase(QueryCache& cache_, VideoCore::QueryType type_)
        : cache{cache_}, type{type_} {}

    /// Updates the state of the stream, enabling or disabling as needed.
    void Update(bool enabled) {
        if (enabled) {
            Enable();
        } else {
            Disable();
        }
    }

    /// Resets the stream to zero. It doesn't disable the query after resetting.
    void Reset() {
        if (current) {
            current->EndQuery();

            // Immediately start a new query to avoid disabling its state.
            current = cache.Counter(nullptr, type);
        }
        last = nullptr;
    }

    /// Returns the current counter slicing as needed.
    std::shared_ptr<HostCounter> Current() {
        if (!current) {
            return nullptr;
        }
        current->EndQuery();
        last = std::move(current);
        current = cache.Counter(last, type);
        return last;
    }

    /// Returns true when the counter stream is enabled.
    bool IsEnabled() const {
        return current != nullptr;
    }

private:
    /// Enables the stream.
    void Enable() {
        if (current) {
            return;
        }
        current = cache.Counter(last, type);
    }

    // Disables the stream.
    void Disable() {
        if (current) {
            current->EndQuery();
        }
        last = std::exchange(current, nullptr);
    }

    QueryCache& cache;
    const VideoCore::QueryType type;

    std::shared_ptr<HostCounter> current;
    std::shared_ptr<HostCounter> last;
};

template <class QueryCache, class CachedQuery, class CounterStream, class HostCounter>
class QueryCacheBase : public VideoCommon::ChannelSetupCaches<VideoCommon::ChannelInfo> {
public:
    explicit QueryCacheBase(VideoCore::RasterizerInterface& rasterizer_)
        : rasterizer{rasterizer_}, streams{{CounterStream{static_cast<QueryCache&>(*this),
                                                          VideoCore::QueryType::SamplesPassed}}} {}

    void InvalidateRegion(VAddr addr, std::size_t size) {
        std::unique_lock lock{mutex};
        FlushAndRemoveRegion(addr, size);
    }

    void FlushRegion(VAddr addr, std::size_t size) {
        std::unique_lock lock{mutex};
        FlushAndRemoveRegion(addr, size);
    }

    /**
     * Records a query in GPU mapped memory, potentially marked with a timestamp.
     * @param gpu_addr  GPU address to flush to when the mapped memory is read.
     * @param type      Query type, e.g. SamplesPassed.
     * @param timestamp Timestamp, when empty the flushed query is assumed to be short.
     */
    void Query(GPUVAddr gpu_addr, VideoCore::QueryType type, std::optional<u64> timestamp) {
        std::unique_lock lock{mutex};
        const std::optional<VAddr> cpu_addr = gpu_memory->GpuToCpuAddress(gpu_addr);
        ASSERT(cpu_addr);

        CachedQuery* query = TryGet(*cpu_addr);
        if (!query) {
            ASSERT_OR_EXECUTE(cpu_addr, return;);
            u8* const host_ptr = gpu_memory->GetPointer(gpu_addr);

            query = Register(type, *cpu_addr, host_ptr, timestamp.has_value());
        }

        query->BindCounter(Stream(type).Current(), timestamp);
        if (Settings::values.use_asynchronous_gpu_emulation.GetValue()) {
            AsyncFlushQuery(*cpu_addr);
        }
    }

    /// Updates counters from GPU state. Expected to be called once per draw, clear or dispatch.
    void UpdateCounters() {
        std::unique_lock lock{mutex};
        if (maxwell3d) {
            const auto& regs = maxwell3d->regs;
            Stream(VideoCore::QueryType::SamplesPassed).Update(regs.zpass_pixel_count_enable);
        }
    }

    /// Resets a counter to zero. It doesn't disable the query after resetting.
    void ResetCounter(VideoCore::QueryType type) {
        std::unique_lock lock{mutex};
        Stream(type).Reset();
    }

    /// Disable all active streams. Expected to be called at the end of a command buffer.
    void DisableStreams() {
        std::unique_lock lock{mutex};
        for (auto& stream : streams) {
            stream.Update(false);
        }
    }

    /// Returns a new host counter.
    std::shared_ptr<HostCounter> Counter(std::shared_ptr<HostCounter> dependency,
                                         VideoCore::QueryType type) {
        return std::make_shared<HostCounter>(static_cast<QueryCache&>(*this), std::move(dependency),
                                             type);
    }

    /// Returns the counter stream of the specified type.
    CounterStream& Stream(VideoCore::QueryType type) {
        return streams[static_cast<std::size_t>(type)];
    }

    /// Returns the counter stream of the specified type.
    const CounterStream& Stream(VideoCore::QueryType type) const {
        return streams[static_cast<std::size_t>(type)];
    }

    void CommitAsyncFlushes() {
        std::unique_lock lock{mutex};
        committed_flushes.push_back(uncommitted_flushes);
        uncommitted_flushes.reset();
    }

    bool HasUncommittedFlushes() const {
        std::unique_lock lock{mutex};
        return uncommitted_flushes != nullptr;
    }

    bool ShouldWaitAsyncFlushes() const {
        std::unique_lock lock{mutex};
        if (committed_flushes.empty()) {
            return false;
        }
        return committed_flushes.front() != nullptr;
    }

    void PopAsyncFlushes() {
        std::unique_lock lock{mutex};
        if (committed_flushes.empty()) {
            return;
        }
        auto& flush_list = committed_flushes.front();
        if (!flush_list) {
            committed_flushes.pop_front();
            return;
        }
        for (VAddr query_address : *flush_list) {
            FlushAndRemoveRegion(query_address, 4);
        }
        committed_flushes.pop_front();
    }

private:
    /// Flushes a memory range to guest memory and removes it from the cache.
    void FlushAndRemoveRegion(VAddr addr, std::size_t size) {
        const u64 addr_begin = addr;
        const u64 addr_end = addr_begin + size;
        const auto in_range = [addr_begin, addr_end](const CachedQuery& query) {
            const u64 cache_begin = query.GetCpuAddr();
            const u64 cache_end = cache_begin + query.SizeInBytes();
            return cache_begin < addr_end && addr_begin < cache_end;
        };

        const u64 page_end = addr_end >> YUZU_PAGEBITS;
        for (u64 page = addr_begin >> YUZU_PAGEBITS; page <= page_end; ++page) {
            const auto& it = cached_queries.find(page);
            if (it == std::end(cached_queries)) {
                continue;
            }
            auto& contents = it->second;
            for (auto& query : contents) {
                if (!in_range(query)) {
                    continue;
                }
                rasterizer.UpdatePagesCachedCount(query.GetCpuAddr(), query.SizeInBytes(), -1);
                query.Flush();
            }
            std::erase_if(contents, in_range);
        }
    }

    /// Registers the passed parameters as cached and returns a pointer to the stored cached query.
    CachedQuery* Register(VideoCore::QueryType type, VAddr cpu_addr, u8* host_ptr, bool timestamp) {
        rasterizer.UpdatePagesCachedCount(cpu_addr, CachedQuery::SizeInBytes(timestamp), 1);
        const u64 page = static_cast<u64>(cpu_addr) >> YUZU_PAGEBITS;
        return &cached_queries[page].emplace_back(static_cast<QueryCache&>(*this), type, cpu_addr,
                                                  host_ptr);
    }

    /// Tries to a get a cached query. Returns nullptr on failure.
    CachedQuery* TryGet(VAddr addr) {
        const u64 page = static_cast<u64>(addr) >> YUZU_PAGEBITS;
        const auto it = cached_queries.find(page);
        if (it == std::end(cached_queries)) {
            return nullptr;
        }
        auto& contents = it->second;
        const auto found = std::find_if(std::begin(contents), std::end(contents),
                                        [addr](auto& query) { return query.GetCpuAddr() == addr; });
        return found != std::end(contents) ? &*found : nullptr;
    }

    void AsyncFlushQuery(VAddr addr) {
        if (!uncommitted_flushes) {
            uncommitted_flushes = std::make_shared<std::vector<VAddr>>();
        }
        uncommitted_flushes->push_back(addr);
    }

    static constexpr std::uintptr_t YUZU_PAGESIZE = 4096;
    static constexpr unsigned YUZU_PAGEBITS = 12;

    VideoCore::RasterizerInterface& rasterizer;

    mutable std::recursive_mutex mutex;

    std::unordered_map<u64, std::vector<CachedQuery>> cached_queries;

    std::array<CounterStream, VideoCore::NumQueryTypes> streams;

    std::shared_ptr<std::vector<VAddr>> uncommitted_flushes{};
    std::list<std::shared_ptr<std::vector<VAddr>>> committed_flushes;
};

template <class QueryCache, class HostCounter>
class HostCounterBase {
public:
    explicit HostCounterBase(std::shared_ptr<HostCounter> dependency_)
        : dependency{std::move(dependency_)}, depth{dependency ? (dependency->Depth() + 1) : 0} {
        // Avoid nesting too many dependencies to avoid a stack overflow when these are deleted.
        constexpr u64 depth_threshold = 96;
        if (depth > depth_threshold) {
            depth = 0;
            base_result = dependency->Query();
            dependency = nullptr;
        }
    }
    virtual ~HostCounterBase() = default;

    /// Returns the current value of the query.
    u64 Query() {
        if (result) {
            return *result;
        }

        u64 value = BlockingQuery() + base_result;
        if (dependency) {
            value += dependency->Query();
            dependency = nullptr;
        }

        result = value;
        return *result;
    }

    /// Returns true when flushing this query will potentially wait.
    bool WaitPending() const noexcept {
        return result.has_value();
    }

    u64 Depth() const noexcept {
        return depth;
    }

protected:
    /// Returns the value of query from the backend API blocking as needed.
    virtual u64 BlockingQuery() const = 0;

private:
    std::shared_ptr<HostCounter> dependency; ///< Counter to add to this value.
    std::optional<u64> result;               ///< Filled with the already returned value.
    u64 depth;                               ///< Number of nested dependencies.
    u64 base_result = 0;                     ///< Equivalent to nested dependencies value.
};

template <class HostCounter>
class CachedQueryBase {
public:
    explicit CachedQueryBase(VAddr cpu_addr_, u8* host_ptr_)
        : cpu_addr{cpu_addr_}, host_ptr{host_ptr_} {}
    virtual ~CachedQueryBase() = default;

    CachedQueryBase(CachedQueryBase&&) noexcept = default;
    CachedQueryBase(const CachedQueryBase&) = delete;

    CachedQueryBase& operator=(CachedQueryBase&&) noexcept = default;
    CachedQueryBase& operator=(const CachedQueryBase&) = delete;

    /// Flushes the query to guest memory.
    virtual void Flush() {
        // When counter is nullptr it means that it's just been reset. We are supposed to write a
        // zero in these cases.
        const u64 value = counter ? counter->Query() : 0;
        std::memcpy(host_ptr, &value, sizeof(u64));

        if (timestamp) {
            std::memcpy(host_ptr + TIMESTAMP_OFFSET, &*timestamp, sizeof(u64));
        }
    }

    /// Binds a counter to this query.
    void BindCounter(std::shared_ptr<HostCounter> counter_, std::optional<u64> timestamp_) {
        if (counter) {
            // If there's an old counter set it means the query is being rewritten by the game.
            // To avoid losing the data forever, flush here.
            Flush();
        }
        counter = std::move(counter_);
        timestamp = timestamp_;
    }

    VAddr GetCpuAddr() const noexcept {
        return cpu_addr;
    }

    u64 SizeInBytes() const noexcept {
        return SizeInBytes(timestamp.has_value());
    }

    static constexpr u64 SizeInBytes(bool with_timestamp) noexcept {
        return with_timestamp ? LARGE_QUERY_SIZE : SMALL_QUERY_SIZE;
    }

protected:
    /// Returns true when querying the counter may potentially block.
    bool WaitPending() const noexcept {
        return counter && counter->WaitPending();
    }

private:
    static constexpr std::size_t SMALL_QUERY_SIZE = 8;   // Query size without timestamp.
    static constexpr std::size_t LARGE_QUERY_SIZE = 16;  // Query size with timestamp.
    static constexpr std::intptr_t TIMESTAMP_OFFSET = 8; // Timestamp offset in a large query.

    VAddr cpu_addr;                       ///< Guest CPU address.
    u8* host_ptr;                         ///< Writable host pointer.
    std::shared_ptr<HostCounter> counter; ///< Host counter to query, owns the dependency tree.
    std::optional<u64> timestamp;         ///< Timestamp to flush to guest memory.
};

} // namespace VideoCommon