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https://github.com/NVIDIA/open-gpu-kernel-modules.git
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85 lines
2.8 KiB
C
85 lines
2.8 KiB
C
/*******************************************************************************
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Copyright (c) 2016 NVIDIA Corporation
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to
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deal in the Software without restriction, including without limitation the
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rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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sell copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*******************************************************************************/
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#include "uvm_common.h"
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#include "uvm_linux.h"
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#include "uvm_perf_utils.h"
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#include "uvm_kvmalloc.h"
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static inline size_t leaves_to_levels(size_t leaf_count)
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{
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return ilog2(roundup_pow_of_two(leaf_count)) + 1;
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}
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// Helper function to compute all the nodes required to store a complete binary tree for the given number of leaves
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static inline size_t leaves_to_nodes(size_t leaf_count)
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{
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size_t ret = 0;
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do {
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ret += leaf_count;
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leaf_count = (leaf_count == 1)? 0 : (leaf_count + 1) / 2;
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} while (leaf_count > 0);
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return ret;
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}
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NV_STATUS uvm_perf_tree_init(uvm_perf_tree_t *tree, size_t node_size, size_t leaf_count)
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{
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NV_STATUS status;
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size_t bytes;
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status = NV_OK;
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tree->leaf_count = leaf_count;
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tree->level_count = leaves_to_levels(leaf_count);
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tree->node_count = leaves_to_nodes(leaf_count);
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tree->pow2_leaf_count = roundup_pow_of_two(tree->leaf_count);
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bytes = tree->node_count * node_size;
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// With this check we make sure that our shift operations will not overflow
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UVM_ASSERT(tree->level_count <= (sizeof(size_t) * 8 - 1));
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tree->nodes = uvm_kvmalloc_zero(bytes);
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if (!tree->nodes)
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status = NV_ERR_NO_MEMORY;
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return status;
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}
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void uvm_perf_tree_destroy(uvm_perf_tree_t *tree)
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{
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UVM_ASSERT(tree);
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UVM_ASSERT(tree->nodes);
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uvm_kvfree(tree->nodes);
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tree->leaf_count = 0;
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tree->nodes = NULL;
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}
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void uvm_perf_tree_clear(uvm_perf_tree_t *tree, size_t node_size)
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{
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UVM_ASSERT(tree);
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UVM_ASSERT(tree->nodes);
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memset(tree->nodes, 0, tree->node_count * node_size);
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}
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