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47993d5 | 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 | /* Copyright 1993-2022 NVIDIA Corporation. All rights reserved.
*
* NOTICE TO LICENSEE:
*
* The source code and/or documentation ("Licensed Deliverables") are
* subject to NVIDIA intellectual property rights under U.S. and
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*/
#ifndef _COOPERATIVE_GROUPS_MEMORY_H_
# define _COOPERATIVE_GROUPS_MEMORY_H_
#include "info.h"
_CG_BEGIN_NAMESPACE
#if defined(_CG_CPP11_FEATURES)
namespace details {
_CG_STATIC_CONST_DECL int scratch_num_reserved_bytes = 12;
#if defined(_CG_HAS_RESERVED_SHARED)
_CG_STATIC_QUALIFIER void* reserved_shared_ptr()
{
void *ptr;
asm ("{\n\t"
" .reg .u32 start;\n\t"
" .reg .u64 extended;\n\t"
" mov.u32 start, %%reserved_smem_offset_1;\n\t"
" cvt.u64.u32 extended, start;\n\t"
" cvta.shared.u64 %0, extended;\n\t"
"}"
: "=" _CG_ASM_PTR_CONSTRAINT(ptr));
return ptr;
}
#endif
struct multi_warp_scratch {
// One barrier per possible size of the group.
_CG_STATIC_CONST_DECL unsigned int memory_barriers_count = 5;
_CG_STATIC_CONST_DECL size_t sync_memory_size = memory_barriers_count * sizeof(barrier_t);
using communication_type = unsigned long long;
_CG_STATIC_CONST_DECL size_t communication_size = sizeof(communication_type);
// Layout of the scratch space:
barrier_t barriers[memory_barriers_count];
char reserved[scratch_num_reserved_bytes]; // Reserve 12 bytes for future use
communication_type communication_memory[default_max_block_size / 32];
_CG_STATIC_CONSTEXPR_QUALIFIER unsigned int scratch_size_needed(unsigned int max_block_size) {
// One slot of collectives memory per warp.
return scratch_num_reserved_bytes + sync_memory_size + max_block_size / 32 * communication_size;
}
_CG_QUALIFIER void init_barriers(unsigned int thread_rank) {
if (thread_rank < memory_barriers_count) {
barriers[thread_rank] = 0;
}
}
};
#if defined(_CG_HAS_RESERVED_SHARED)
// CG can expect at least 288 bytes available in reserved shared
static_assert(sizeof(multi_warp_scratch) <= 288, "multi-warp scratch size is too large");
#endif
// Make sure the structure can fit into the user provided memory
static_assert(sizeof(multi_warp_scratch) <= multi_warp_scratch::scratch_size_needed(default_max_block_size),
"multi-warp scratch size is too large");
_CG_QUALIFIER multi_warp_scratch* get_scratch_ptr(void* user_scratch) {
void *ptr;
#if defined(_CG_HAS_RESERVED_SHARED)
ptr = reserved_shared_ptr();
#else
ptr = user_scratch;
#endif
return static_cast<multi_warp_scratch*>(ptr);
}
}
template <unsigned int MaxBlockSize = details::default_max_block_size>
struct __align__(details::multi_warp_scratch::communication_size) block_tile_memory {
private:
#if !defined(_CG_HAS_RESERVED_SHARED)
char scratch[details::multi_warp_scratch::scratch_size_needed(MaxBlockSize)];
#endif
};
#endif
_CG_END_NAMESPACE
#endif /* !_COOPERATIVE_GROUPS_MEMORY_H_ */
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