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* Copyright (c) 2025 by FlashInfer team.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef FLASHINFER_PROFILER_CUH_
#define FLASHINFER_PROFILER_CUH_
#include <cuda.h>
namespace flashinfer {
__device__ __forceinline__ uint32_t get_block_idx() {
return (blockIdx.z * gridDim.y + blockIdx.y) * gridDim.x + blockIdx.x;
}
__device__ __forceinline__ uint32_t get_num_blocks() { return gridDim.x * gridDim.y * gridDim.z; }
__device__ __forceinline__ uint32_t get_thread_idx() {
return (threadIdx.z * blockDim.y + threadIdx.y) * blockDim.x + threadIdx.x;
}
constexpr uint32_t BLOCK_GROUP_IDX_MASK = 0xFFFFF;
constexpr uint32_t EVENT_IDX_MASK = 0x3FF;
constexpr uint32_t BEGIN_END_MASK = 0x3;
constexpr uint32_t EVENT_IDX_SHIFT = 2;
constexpr uint32_t BLOCK_GROUP_IDX_SHIFT = 12;
constexpr uint32_t SM_ID_SHIFT = 24;
// Tag layout:
// bits 0-1: event_type (start, end, instant)
// bits 2-11: event_idx (translates to event_names in python profiler)
// bits 12-23: block_id (12 bits)
// bits 24-31: sm_id (8 bits)
constexpr uint32_t EVENT_BEGIN = 0x0;
constexpr uint32_t EVENT_END = 0x1;
constexpr uint32_t EVENT_INSTANT = 0x2;
__device__ __forceinline__ uint32_t encode_tag(uint32_t sm_id, uint32_t block_id,
uint32_t event_idx, uint32_t event_type) {
return (sm_id << SM_ID_SHIFT) | (block_id << BLOCK_GROUP_IDX_SHIFT) |
(event_idx << EVENT_IDX_SHIFT) | event_type;
}
__device__ __forceinline__ uint32_t get_timestamp() {
volatile uint32_t ret;
asm volatile("mov.u32 %0, %globaltimer_lo;" : "=r"(ret));
return ret;
}
struct ProfilerEntry {
union {
struct {
uint32_t nblocks;
uint32_t ngroups;
};
struct {
uint32_t tag;
uint32_t delta_time;
};
uint64_t raw;
};
};
#ifdef FLASHINFER_ENABLE_PROFILER
#define PROFILER_CLOSURE_PARAMS_DECL \
ProfilerEntry entry; \
uint64_t* profiler_write_ptr; \
uint32_t profiler_write_stride; \
uint32_t profiler_entry_tag_base; \
bool profiler_write_thread_predicate;
#define PROFILER_CLOSURE_FUNC_PARAMS , ProfilerClosure& profiler_closure
#define PROFILER_FUNC_PARAMS , at::Tensor profiler_buffer
#define PROFILER_PARAMS_DECL uint64_t* profiler_buffer;
#define PROFILER_INIT(params, smem_storage, closure, group_idx, num_groups, \
write_thread_predicate) \
uint32_t _sm_idx; \
asm volatile("mov.u32 %0, %smid;" : "=r"(_sm_idx)); \
if (get_block_idx() == 0 && get_thread_idx() == 0) { \
closure.entry.nblocks = get_num_blocks(); \
closure.entry.ngroups = num_groups; \
params.profiler_buffer[0] = closure.entry.raw; \
} \
closure.profiler_write_ptr = \
params.profiler_buffer + 1 + get_block_idx() * num_groups + group_idx; \
closure.profiler_write_stride = get_num_blocks() * num_groups; \
closure.profiler_entry_tag_base = encode_tag(_sm_idx, get_block_idx(), 0, 0); \
closure.profiler_write_thread_predicate = write_thread_predicate;
#define PROFILER_EVENT_START(closure, event) \
if (closure.profiler_write_thread_predicate) { \
closure.entry.tag = \
closure.profiler_entry_tag_base | ((uint32_t)event << EVENT_IDX_SHIFT) | EVENT_BEGIN; \
closure.entry.delta_time = get_timestamp(); \
*closure.profiler_write_ptr = closure.entry.raw; \
closure.profiler_write_ptr += closure.profiler_write_stride; \
} \
__threadfence_block();
#define PROFILER_EVENT_END(closure, event) \
__threadfence_block(); \
if (closure.profiler_write_thread_predicate) { \
closure.entry.tag = \
closure.profiler_entry_tag_base | ((uint32_t)event << EVENT_IDX_SHIFT) | EVENT_END; \
closure.entry.delta_time = get_timestamp(); \
*closure.profiler_write_ptr = closure.entry.raw; \
closure.profiler_write_ptr += closure.profiler_write_stride; \
}
#define PROFILER_EVENT_INSTANT(closure, event) \
__threadfence_block(); \
if (closure.profiler_write_thread_predicate) { \
closure.entry.tag = \
closure.profiler_entry_tag_base | ((uint32_t)event << EVENT_IDX_SHIFT) | EVENT_INSTANT; \
closure.entry.delta_time = get_timestamp(); \
*closure.profiler_write_ptr = closure.entry.raw; \
} \
__threadfence_block();
#else
#define PROFILER_CLOSURE_PARAMS_DECL
#define PROFILER_CLOSURE_FUNC_PARAMS
#define PROFILER_FUNC_PARAMS
#define PROFILER_PARAMS_DECL
#define PROFILER_INIT(params, smem_storage, closure, group_idx, num_groups, write_thread_predicate)
#define PROFILER_EVENT_START(closure, event)
#define PROFILER_EVENT_END(closure, event)
#define PROFILER_EVENT_INSTANT(closure, event)
#endif
} // namespace flashinfer
#endif // FLASHINFER_PROFILER_CUH_
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