task.cu
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//===------------- task.h - NVPTX OpenMP tasks support ----------- CUDA -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Task implementation support.
//
// explicit task structure uses
// omptarget_nvptx task
// kmp_task
//
// where kmp_task is
// - klegacy_TaskDescr <- task pointer
// shared -> X
// routine
// part_id
// descr
// - private (of size given by task_alloc call). Accessed by
// task+sizeof(klegacy_TaskDescr)
// * private data *
// - shared: X. Accessed by shared ptr in klegacy_TaskDescr
// * pointer table to shared variables *
// - end
//
//===----------------------------------------------------------------------===//
#include "common/omptarget.h"
EXTERN kmp_TaskDescr *__kmpc_omp_task_alloc(
kmp_Ident *loc, // unused
uint32_t global_tid, // unused
int32_t flag, // unused (because in our impl, all are immediately exec
size_t sizeOfTaskInclPrivate, size_t sizeOfSharedTable,
kmp_TaskFctPtr taskSub) {
PRINT(LD_IO,
"call __kmpc_omp_task_alloc(size priv&struct %lld, shared %lld, "
"fct 0x%llx)\n",
(long long)sizeOfTaskInclPrivate, (long long)sizeOfSharedTable,
(unsigned long long)taskSub);
// want task+priv to be a multiple of 8 bytes
size_t padForTaskInclPriv = PadBytes(sizeOfTaskInclPrivate, sizeof(void *));
sizeOfTaskInclPrivate += padForTaskInclPriv;
size_t kmpSize = sizeOfTaskInclPrivate + sizeOfSharedTable;
ASSERT(LT_FUSSY, sizeof(omptarget_nvptx_TaskDescr) % sizeof(void *) == 0,
"need task descr of size %d to be a multiple of %d\n",
(int)sizeof(omptarget_nvptx_TaskDescr), (int)sizeof(void *));
size_t totSize = sizeof(omptarget_nvptx_TaskDescr) + kmpSize;
omptarget_nvptx_ExplicitTaskDescr *newExplicitTaskDescr =
(omptarget_nvptx_ExplicitTaskDescr *)SafeMalloc(
totSize, "explicit task descriptor");
kmp_TaskDescr *newKmpTaskDescr = &newExplicitTaskDescr->kmpTaskDescr;
ASSERT0(LT_FUSSY,
(uint64_t)newKmpTaskDescr ==
(uint64_t)ADD_BYTES(newExplicitTaskDescr,
sizeof(omptarget_nvptx_TaskDescr)),
"bad size assumptions");
// init kmp_TaskDescr
newKmpTaskDescr->sharedPointerTable =
(void *)((char *)newKmpTaskDescr + sizeOfTaskInclPrivate);
newKmpTaskDescr->sub = taskSub;
newKmpTaskDescr->destructors = NULL;
PRINT(LD_TASK, "return with task descr kmp: 0x%llx, omptarget-nvptx 0x%llx\n",
(unsigned long long)newKmpTaskDescr,
(unsigned long long)newExplicitTaskDescr);
return newKmpTaskDescr;
}
EXTERN int32_t __kmpc_omp_task(kmp_Ident *loc, uint32_t global_tid,
kmp_TaskDescr *newKmpTaskDescr) {
return __kmpc_omp_task_with_deps(loc, global_tid, newKmpTaskDescr, 0, 0, 0,
0);
}
EXTERN int32_t __kmpc_omp_task_with_deps(kmp_Ident *loc, uint32_t global_tid,
kmp_TaskDescr *newKmpTaskDescr,
int32_t depNum, void *depList,
int32_t noAliasDepNum,
void *noAliasDepList) {
PRINT(LD_IO, "call to __kmpc_omp_task_with_deps(task 0x%llx)\n",
P64(newKmpTaskDescr));
ASSERT0(LT_FUSSY, checkRuntimeInitialized(loc),
"Runtime must be initialized.");
// 1. get explicit task descr from kmp task descr
omptarget_nvptx_ExplicitTaskDescr *newExplicitTaskDescr =
(omptarget_nvptx_ExplicitTaskDescr *)SUB_BYTES(
newKmpTaskDescr, sizeof(omptarget_nvptx_TaskDescr));
ASSERT0(LT_FUSSY, &newExplicitTaskDescr->kmpTaskDescr == newKmpTaskDescr,
"bad assumptions");
omptarget_nvptx_TaskDescr *newTaskDescr = &newExplicitTaskDescr->taskDescr;
ASSERT0(LT_FUSSY, (uint64_t)newTaskDescr == (uint64_t)newExplicitTaskDescr,
"bad assumptions");
// 2. push new context: update new task descriptor
int tid = GetLogicalThreadIdInBlock(checkSPMDMode(loc));
omptarget_nvptx_TaskDescr *parentTaskDescr = getMyTopTaskDescriptor(tid);
newTaskDescr->CopyForExplicitTask(parentTaskDescr);
// set new task descriptor as top
omptarget_nvptx_threadPrivateContext->SetTopLevelTaskDescr(tid, newTaskDescr);
// 3. call sub
PRINT(LD_TASK, "call task sub 0x%llx(task descr 0x%llx)\n",
(unsigned long long)newKmpTaskDescr->sub,
(unsigned long long)newKmpTaskDescr);
newKmpTaskDescr->sub(0, newKmpTaskDescr);
PRINT(LD_TASK, "return from call task sub 0x%llx()\n",
(unsigned long long)newKmpTaskDescr->sub);
// 4. pop context
omptarget_nvptx_threadPrivateContext->SetTopLevelTaskDescr(tid,
parentTaskDescr);
// 5. free
SafeFree(newExplicitTaskDescr, "explicit task descriptor");
return 0;
}
EXTERN void __kmpc_omp_task_begin_if0(kmp_Ident *loc, uint32_t global_tid,
kmp_TaskDescr *newKmpTaskDescr) {
PRINT(LD_IO, "call to __kmpc_omp_task_begin_if0(task 0x%llx)\n",
(unsigned long long)newKmpTaskDescr);
ASSERT0(LT_FUSSY, checkRuntimeInitialized(loc),
"Runtime must be initialized.");
// 1. get explicit task descr from kmp task descr
omptarget_nvptx_ExplicitTaskDescr *newExplicitTaskDescr =
(omptarget_nvptx_ExplicitTaskDescr *)SUB_BYTES(
newKmpTaskDescr, sizeof(omptarget_nvptx_TaskDescr));
ASSERT0(LT_FUSSY, &newExplicitTaskDescr->kmpTaskDescr == newKmpTaskDescr,
"bad assumptions");
omptarget_nvptx_TaskDescr *newTaskDescr = &newExplicitTaskDescr->taskDescr;
ASSERT0(LT_FUSSY, (uint64_t)newTaskDescr == (uint64_t)newExplicitTaskDescr,
"bad assumptions");
// 2. push new context: update new task descriptor
int tid = GetLogicalThreadIdInBlock(checkSPMDMode(loc));
omptarget_nvptx_TaskDescr *parentTaskDescr = getMyTopTaskDescriptor(tid);
newTaskDescr->CopyForExplicitTask(parentTaskDescr);
// set new task descriptor as top
omptarget_nvptx_threadPrivateContext->SetTopLevelTaskDescr(tid, newTaskDescr);
// 3... noting to call... is inline
// 4 & 5 ... done in complete
}
EXTERN void __kmpc_omp_task_complete_if0(kmp_Ident *loc, uint32_t global_tid,
kmp_TaskDescr *newKmpTaskDescr) {
PRINT(LD_IO, "call to __kmpc_omp_task_complete_if0(task 0x%llx)\n",
(unsigned long long)newKmpTaskDescr);
ASSERT0(LT_FUSSY, checkRuntimeInitialized(loc),
"Runtime must be initialized.");
// 1. get explicit task descr from kmp task descr
omptarget_nvptx_ExplicitTaskDescr *newExplicitTaskDescr =
(omptarget_nvptx_ExplicitTaskDescr *)SUB_BYTES(
newKmpTaskDescr, sizeof(omptarget_nvptx_TaskDescr));
ASSERT0(LT_FUSSY, &newExplicitTaskDescr->kmpTaskDescr == newKmpTaskDescr,
"bad assumptions");
omptarget_nvptx_TaskDescr *newTaskDescr = &newExplicitTaskDescr->taskDescr;
ASSERT0(LT_FUSSY, (uint64_t)newTaskDescr == (uint64_t)newExplicitTaskDescr,
"bad assumptions");
// 2. get parent
omptarget_nvptx_TaskDescr *parentTaskDescr = newTaskDescr->GetPrevTaskDescr();
// 3... noting to call... is inline
// 4. pop context
int tid = GetLogicalThreadIdInBlock(checkSPMDMode(loc));
omptarget_nvptx_threadPrivateContext->SetTopLevelTaskDescr(tid,
parentTaskDescr);
// 5. free
SafeFree(newExplicitTaskDescr, "explicit task descriptor");
}
EXTERN void __kmpc_omp_wait_deps(kmp_Ident *loc, uint32_t global_tid,
int32_t depNum, void *depList,
int32_t noAliasDepNum, void *noAliasDepList) {
PRINT0(LD_IO, "call to __kmpc_omp_wait_deps(..)\n");
// nothing to do as all our tasks are executed as final
}
EXTERN void __kmpc_taskgroup(kmp_Ident *loc, uint32_t global_tid) {
PRINT0(LD_IO, "call to __kmpc_taskgroup(..)\n");
// nothing to do as all our tasks are executed as final
}
EXTERN void __kmpc_end_taskgroup(kmp_Ident *loc, uint32_t global_tid) {
PRINT0(LD_IO, "call to __kmpc_end_taskgroup(..)\n");
// nothing to do as all our tasks are executed as final
}
EXTERN int32_t __kmpc_omp_taskyield(kmp_Ident *loc, uint32_t global_tid,
int end_part) {
PRINT0(LD_IO, "call to __kmpc_taskyield()\n");
// do nothing: tasks are executed immediately, no yielding allowed
return 0;
}
EXTERN int32_t __kmpc_omp_taskwait(kmp_Ident *loc, uint32_t global_tid) {
PRINT0(LD_IO, "call to __kmpc_taskwait()\n");
// nothing to do as all our tasks are executed as final
return 0;
}
EXTERN void __kmpc_taskloop(kmp_Ident *loc, uint32_t global_tid,
kmp_TaskDescr *newKmpTaskDescr, int if_val,
uint64_t *lb, uint64_t *ub, int64_t st, int nogroup,
int32_t sched, uint64_t grainsize, void *task_dup) {
// skip task entirely if empty iteration space
if (*lb > *ub)
return;
// the compiler has already stored lb and ub in the kmp_TaskDescr structure
// as we are using a single task to execute the entire loop, we can leave
// the initial task_t untouched
__kmpc_omp_task_with_deps(loc, global_tid, newKmpTaskDescr, 0, 0, 0, 0);
}