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1 files changed, 533 insertions, 0 deletions

diff --git a/llama.cpp/src/llama-kv-cells.h b/llama.cpp/src/llama-kv-cells.h
new file mode 100644
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+++ b/llama.cpp/src/llama-kv-cells.h
@@ -0,0 +1,533 @@
+#pragma once
+
+#include "llama.h"
+#include "llama-cparams.h"
+
+#include <bitset>
+#include <cassert>
+#include <cstring>
+#include <map>
+#include <set>
+#include <vector>
+
+struct llama_kv_cell_ext {
+    // 2D spatial positions, typically used for M-RoPE
+    llama_pos x = 0;
+    llama_pos y = 0;
+
+    // return true if the current 2D spatial position is greater than other
+    bool is_2d_gt(llama_pos ox, llama_pos oy) const {
+        return (y > oy) || (y == oy && x > ox);
+    }
+
+    void reset() {
+        static_assert(std::is_trivially_copyable_v<llama_kv_cell_ext>);
+
+        memset(this, 0, sizeof(*this));
+    }
+};
+
+// meta information about KV cells that can be part of multiple sequences at the same time
+// TODO: add unit tests
+class llama_kv_cells {
+public:
+    void reset() {
+        for (uint32_t i = 0; i < pos.size(); ++i) {
+            pos[i]   = -1;
+            ext[i].reset();
+            shift[i] =  0;
+            seq[i].reset();
+        }
+
+        has_shift = false;
+
+        used.clear();
+
+        for (uint32_t s = 0; s < LLAMA_MAX_SEQ; ++s) {
+            seq_pos[s].clear();
+        }
+    }
+
+    void reset_shift() {
+        has_shift = false;
+
+        for (uint32_t i = 0; i < shift.size(); ++i) {
+            shift[i] = 0;
+        }
+    }
+
+    uint32_t size() const {
+        return pos.size();
+    }
+
+    void resize(uint32_t n) {
+        pos.resize(n);
+        ext.resize(n);
+        shift.resize(n);
+        seq.resize(n);
+
+        reset();
+    }
+
+    bool is_empty(uint32_t i) const {
+        assert(i < pos.size());
+        assert((pos[i] < 0 && pos[i] == -1) || pos[i] >= 0);
+
+        return pos[i] == -1;
+    }
+
+    uint32_t get_used() const {
+        return used.size();
+    }
+
+    // the index of the first cell that is used
+    // return 0 if no cells are used
+    uint32_t used_min() const {
+        return used.empty() ? 0 : *used.begin();
+    }
+
+    // the index of the last cell that is used + 1
+    // return 0 if no cells are used
+    uint32_t used_max_p1() const {
+        return used.empty() ? 0 : *used.rbegin() + 1;
+    }
+
+    bool get_has_shift() const {
+        return has_shift;
+    }
+
+    // move cell isrc to idst (used during defrag)
+    //void mv(uint32_t isrc, uint32_t idst) {
+    //    assert(isrc < pos.size());
+    //    assert(idst < pos.size());
+
+    //    assert(pos[idst] == -1);
+    //    assert(pos[isrc] != -1);
+
+    //    pos  [idst] = pos  [isrc];
+    //    shift[idst] = shift[isrc];
+    //    seq  [idst] = seq  [isrc];
+
+    //    pos  [isrc] = -1;
+    //    shift[isrc] =  0;
+    //    seq  [isrc].reset();
+
+    //    used.erase (isrc);
+    //    used.insert(idst);
+    //}
+
+    // copy the state of cells [i, i + n) (used for save/restore the state of the cells)
+    llama_kv_cells cp(uint32_t i, uint32_t n) const {
+        assert(i + n <= pos.size());
+
+        llama_kv_cells res;
+
+        res.resize(n);
+
+        for (uint32_t j = 0; j < n; ++j) {
+            const auto idx = i + j;
+
+            res.pos[j] = pos[idx];
+            res.ext[j] = ext[idx];
+            res.seq[j] = seq[idx];
+
+            assert(shift[idx] == 0);
+        }
+
+        return res;
+    }
+
+    // copy the state of cells [idxs[0], idxs[1], ..., idxs[idxs.size() - 1])
+    llama_kv_cells cp(const std::vector<uint32_t> & idxs) const {
+        llama_kv_cells res;
+
+        res.resize(idxs.size());
+
+        for (uint32_t j = 0; j < idxs.size(); ++j) {
+            const auto idx = idxs[j];
+
+            res.pos[j] = pos[idx];
+            res.ext[j] = ext[idx];
+            res.seq[j] = seq[idx];
+
+            assert(shift[idx] == 0);
+        }
+
+        return res;
+    }
+
+    // set the state of cells [i, i + other.pos.size()) (used for save/restore the state of the cells)
+    void set(uint32_t i, const llama_kv_cells & other) {
+        assert(i + other.pos.size() <= pos.size());
+
+        for (uint32_t j = 0; j < other.pos.size(); ++j) {
+            const auto idx = i + j;
+
+            if (pos[idx] == -1 && other.pos[j] != -1) {
+                used.insert(i + j);
+            }
+
+            if (pos[idx] != -1 && other.pos[j] == -1) {
+                used.erase(i + j);
+            }
+
+            if (pos[idx] != -1) {
+                seq_pos_rm(i + j);
+            }
+
+            pos[idx] = other.pos[j];
+            ext[idx] = other.ext[j];
+            seq[idx] = other.seq[j];
+
+            if (pos[idx] != -1) {
+                seq_pos_add(i + j);
+            }
+
+            assert(shift[idx] == 0);
+        }
+    }
+
+    // set the state of cells [idxs[0], idxs[1], ..., idxs[idxs.size() - 1])
+    void set(const std::vector<uint32_t> & idxs, const llama_kv_cells & other) {
+        assert(idxs.size() == other.pos.size());
+
+        for (uint32_t j = 0; j < other.pos.size(); ++j) {
+            const auto idx = idxs[j];
+
+            if (pos[idx] == -1 && other.pos[j] != -1) {
+                used.insert(idx);
+            }
+
+            if (pos[idx] != -1 && other.pos[j] == -1) {
+                used.erase(idx);
+            }
+
+            if (pos[idx] != -1) {
+                seq_pos_rm(idx);
+            }
+
+            pos[idx] = other.pos[j];
+            ext[idx] = other.ext[j];
+            seq[idx] = other.seq[j];
+
+            if (pos[idx] != -1) {
+                seq_pos_add(idx);
+            }
+
+            assert(shift[idx] == 0);
+        }
+    }
+
+    // clear a non-empty cell
+    void rm(uint32_t i) {
+        assert(i < pos.size());
+        assert(pos[i] != -1);
+
+        seq_pos_rm(i);
+        seq[i].reset();
+
+        pos[i] = -1;
+        ext[i].reset();
+        shift[i] = 0;
+
+        used.erase(i);
+    }
+
+    // note: call only if the cell has seq_id
+    // return true if the cell becomes empty
+    bool seq_rm(uint32_t i, llama_seq_id seq_id) {
+        assert(i < pos.size());
+        assert(seq[i].test(seq_id));
+        assert(pos[i] != -1);
+        assert(seq_id >= 0);
+
+        seq[i].reset(seq_id);
+        seq_pos_dec(seq_id, pos[i]);
+
+        if (seq[i].none()) {
+            pos[i] = -1;
+            ext[i].reset();
+            shift[i] = 0;
+
+            used.erase(i);
+
+            return true;
+        }
+
+        return false;
+    }
+
+    // return true if the cell becomes empty (i.e. it did not contain seq_id before the call)
+    bool seq_keep(uint32_t i, llama_seq_id seq_id) {
+        assert(i < pos.size());
+
+        if (seq[i].test(seq_id)) {
+            seq_pos_rm(i);
+            seq[i].reset();
+
+            seq[i].set(seq_id);
+            seq_pos_inc(seq_id, pos[i]);
+
+            return false;
+        }
+
+        if (seq[i].any()) {
+            seq_pos_rm(i);
+            seq[i].reset();
+
+            pos[i] = -1;
+            ext[i].reset();
+            shift[i] = 0;
+
+            used.erase(i);
+
+            return true;
+        }
+
+        assert(pos[i] == -1);
+
+        return false;
+    }
+
+    // number of different sequences in the cell
+    int seq_count(uint32_t i) const {
+        assert(i < pos.size());
+        assert(pos[i] != -1);
+
+        return seq[i].count();
+    }
+
+    // check if the cell contains seq_id
+    bool seq_has(uint32_t i, llama_seq_id seq_id) const {
+        assert(i < pos.size());
+        assert(seq_id >= 0);
+
+        return seq[i].test(seq_id);
+    }
+
+    // note: call only if the cell is not empty and the seq_id is not in the cell
+    void seq_add(uint32_t i, llama_seq_id seq_id) {
+        assert(i < pos.size());
+        assert(pos[i] != -1);
+        assert(!seq[i].test(seq_id));
+
+        seq[i].set(seq_id);
+        seq_pos_inc(seq_id, pos[i]);
+    }
+
+    // return the sequence id of this cell
+    // note: call only for cells with exactly one sequence
+    llama_seq_id seq_get(uint32_t i) const {
+        assert(seq[i].count() == 1);
+
+        for (int s = 0; s < LLAMA_MAX_SEQ; ++s) {
+            if (seq[i].test(s)) {
+                return s;
+            }
+        }
+
+        return -1;
+    }
+
+    // the minimum position of sequence seq_id currently present in any of the cells
+    // return -1 if the sequence is not present
+    llama_pos seq_pos_min(llama_seq_id seq_id) const {
+        assert(seq_id >= 0);
+        assert(seq_id < LLAMA_MAX_SEQ);
+
+        if (seq_pos[seq_id].empty()) {
+            return -1;
+        }
+
+        assert(seq_pos[seq_id].begin()->second > 0);
+
+        return seq_pos[seq_id].begin()->first;
+    }
+
+    // the maximum position of sequence seq_id currently present in any of the cells
+    // return -1 if the sequence is not present
+    llama_pos seq_pos_max(llama_seq_id seq_id) const {
+        assert(seq_id >= 0);
+        assert(seq_id < LLAMA_MAX_SEQ);
+
+        if (seq_pos[seq_id].empty()) {
+            return -1;
+        }
+
+        assert(seq_pos[seq_id].rbegin()->second > 0);
+
+        return seq_pos[seq_id].rbegin()->first;
+    }
+
+    // note: call only if the cell is not empty
+    llama_pos pos_get(uint32_t i) const {
+        assert(i < pos.size());
+        assert(pos[i] != -1);
+
+        return pos[i];
+    }
+
+    const llama_kv_cell_ext & ext_get(uint32_t i) const {
+        assert(i < pos.size());
+        assert(pos[i] != -1);
+
+        return ext[i];
+    }
+
+    // note: call only if the cell is not empty
+    llama_pos get_shift(uint32_t i) const {
+        assert(i < pos.size());
+        assert(pos[i] != -1);
+
+        return shift[i];
+    }
+
+    // check if a cell is not empty and its position is within [p0, p1)
+    bool pos_in(uint32_t i, llama_pos p0, llama_pos p1) const {
+        assert(i < pos.size());
+
+        return pos[i] >= p0 && pos[i] < p1;
+    }
+
+    // set the position of an empty cell
+    // does not modify "has_shift"
+    // note: call only if the cell is empty
+    void pos_set(uint32_t i, llama_pos p) {
+        assert(i < pos.size());
+        assert(pos[i] == -1);
+        assert(seq[i].none());
+
+        pos[i] = p;
+
+        used.insert(i);
+    }
+
+    void ext_set(uint32_t i, llama_kv_cell_ext p) {
+        assert(i < ext.size());
+        ext[i] = p;
+    }
+
+    // pos[i] = pos[i] + d
+    // sets "has_shift" to true
+    // note: call only if the cell is not empty
+    bool pos_add(uint32_t i, llama_pos d) {
+        assert(i < pos.size());
+        assert(pos[i] != -1);
+
+        seq_pos_rm(i);
+
+        pos[i]   += d;
+        shift[i] += d;
+
+        has_shift = true;
+
+        if (pos[i] < 0) {
+            seq[i].reset();
+            pos[i] = -1;
+            shift[i] = 0;
+
+            used.erase(i);
+
+            return true;
+        }
+
+        seq_pos_add(i);
+
+        return false;
+    }
+
+    // pos[i] = pos[i] / d
+    // sets "has_shift" to true
+    // note: call only if the cell is not empty
+    void pos_div(uint32_t i, int d) {
+        assert(i < pos.size());
+        assert(pos[i] != -1);
+
+        const llama_pos p_old = pos[i];
+
+        seq_pos_rm(i);
+
+        pos[i]   /= d;
+        shift[i] += p_old - pos[i];
+
+        seq_pos_add(i);
+
+        has_shift = true;
+    }
+
+private:
+    bool has_shift = false;
+
+    // set of indices of used cells (i.e. pos[i] != -1, allowed to not have any seq_id)
+    std::set<uint32_t> used;
+
+    std::vector<llama_pos> pos;
+
+    // stores extra info per cell
+    std::vector<llama_kv_cell_ext> ext;
+
+    // this array accumulates any applied shifts to the pos array since the last reset_shift() call
+    // this is used to queue multiple updates to the pos array, which in the end can be applied in one go:
+    //
+    //   cells.pos_add(x, shift_x);
+    //   cells.pos_div(y, shift_y);
+    //   ...
+    //
+    //   if (cells.has_shift()) {
+    //      for (int i = 0; i < n; ++i) {
+    //          auto shift_i = cells.get_shift(i);
+    //          ...
+    //      }
+    //      cells.reset_shift();
+    //   }
+    //
+    std::vector<llama_pos> shift;
+
+    using seq_set_t = std::bitset<LLAMA_MAX_SEQ>;
+
+    // the bitset seq[i] tells us which sequences are currently occupying the i-th cell
+    std::vector<seq_set_t> seq;
+
+    // the set seq_pos[s][p] tells us how many times the position p is currently present for sequence s
+    // if the position p is not present, seq_pos[s][p] is not set
+    // this way seq_pos[s].begin() and seq_pos[s].rbegin() give us the min/max positions currently in the cache
+    //
+    // note that we cannot a use an std::set because in some cases a position can occur more than once for the same seq:
+    //  - during performing a cache reuse via (rm + add)
+    //  - some vision models have input embeddings with repeating positions
+    //
+    std::map<llama_pos, int> seq_pos[LLAMA_MAX_SEQ];
+
+    // helper functions for updating `seq_pos`, once cell at a time:
+
+    void seq_pos_dec(llama_seq_id s, llama_pos p) {
+        auto it = seq_pos[s].find(p);
+        assert(it != seq_pos[s].end());
+
+        if (--it->second == 0) {
+            seq_pos[s].erase(it);
+        }
+    }
+
+    void seq_pos_inc(llama_seq_id s, llama_pos p) {
+        seq_pos[s][p]++;
+    }
+
+    // remove cell i
+    void seq_pos_rm(uint32_t i) {
+        for (int s = 0; s < LLAMA_MAX_SEQ; ++s) {
+            if (seq[i].test(s)) {
+                seq_pos_dec(s, pos[i]);
+            }
+        }
+    }
+
+    // add cell i
+    void seq_pos_add(uint32_t i) {
+        for (int s = 0; s < LLAMA_MAX_SEQ; ++s) {
+            if (seq[i].test(s)) {
+                seq_pos_inc(s, pos[i]);
+            }
+        }
+    }
+};