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//===-------- interface.cpp - Target independent OpenMP target RTL --------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.txt for details.
//
//===----------------------------------------------------------------------===//
//
// Implementation of the interface to be used by Clang during the codegen of a
// target region.
//
//===----------------------------------------------------------------------===//
#include <omptarget.h>
#include "device.h"
#include "private.h"
#include "rtl.h"
#include <cassert>
#include <cstdlib>
#include <mutex>
// Store target policy (disabled, mandatory, default)
kmp_target_offload_kind_t TargetOffloadPolicy = tgt_default;
std::mutex TargetOffloadMtx;
////////////////////////////////////////////////////////////////////////////////
/// manage the success or failure of a target constuct
static void HandleDefaultTargetOffload() {
TargetOffloadMtx.lock();
if (TargetOffloadPolicy == tgt_default) {
if (omp_get_num_devices() > 0) {
DP("Default TARGET OFFLOAD policy is now mandatory "
"(devicew were found)\n");
TargetOffloadPolicy = tgt_mandatory;
} else {
DP("Default TARGET OFFLOAD policy is now disabled "
"(devices were not found)\n");
TargetOffloadPolicy = tgt_disabled;
}
}
TargetOffloadMtx.unlock();
}
static int IsOffloadDisabled() {
if (TargetOffloadPolicy == tgt_default) HandleDefaultTargetOffload();
return TargetOffloadPolicy == tgt_disabled;
}
static void HandleTargetOutcome(bool success) {
switch (TargetOffloadPolicy) {
case tgt_disabled:
if (success) {
FATAL_MESSAGE0(1, "expected no offloading while offloading is disabled");
}
break;
case tgt_default:
FATAL_MESSAGE0(1, "default offloading policy must switched to "
"mandatory or disabled");
break;
case tgt_mandatory:
if (!success) {
FATAL_MESSAGE0(1, "failure of target construct while offloading is mandatory");
}
break;
}
}
////////////////////////////////////////////////////////////////////////////////
/// adds a target shared library to the target execution image
EXTERN void __tgt_register_lib(__tgt_bin_desc *desc) {
RTLs.RegisterLib(desc);
}
////////////////////////////////////////////////////////////////////////////////
/// unloads a target shared library
EXTERN void __tgt_unregister_lib(__tgt_bin_desc *desc) {
RTLs.UnregisterLib(desc);
}
/// creates host-to-target data mapping, stores it in the
/// libomptarget.so internal structure (an entry in a stack of data maps)
/// and passes the data to the device.
EXTERN void __tgt_target_data_begin(int64_t device_id, int32_t arg_num,
void **args_base, void **args, int64_t *arg_sizes, int64_t *arg_types) {
if (IsOffloadDisabled()) return;
DP("Entering data begin region for device %" PRId64 " with %d mappings\n",
device_id, arg_num);
// No devices available?
if (device_id == OFFLOAD_DEVICE_DEFAULT) {
device_id = omp_get_default_device();
DP("Use default device id %" PRId64 "\n", device_id);
}
if (CheckDeviceAndCtors(device_id) != OFFLOAD_SUCCESS) {
DP("Failed to get device %" PRId64 " ready\n", device_id);
HandleTargetOutcome(false);
return;
}
DeviceTy& Device = Devices[device_id];
#ifdef OMPTARGET_DEBUG
for (int i=0; i<arg_num; ++i) {
DP("Entry %2d: Base=" DPxMOD ", Begin=" DPxMOD ", Size=%" PRId64
", Type=0x%" PRIx64 "\n", i, DPxPTR(args_base[i]), DPxPTR(args[i]),
arg_sizes[i], arg_types[i]);
}
#endif
int rc = target_data_begin(Device, arg_num, args_base,
args, arg_sizes, arg_types);
HandleTargetOutcome(rc == OFFLOAD_SUCCESS);
}
EXTERN void __tgt_target_data_begin_nowait(int64_t device_id, int32_t arg_num,
void **args_base, void **args, int64_t *arg_sizes, int64_t *arg_types,
int32_t depNum, void *depList, int32_t noAliasDepNum,
void *noAliasDepList) {
if (depNum + noAliasDepNum > 0)
__kmpc_omp_taskwait(NULL, 0);
__tgt_target_data_begin(device_id, arg_num, args_base, args, arg_sizes,
arg_types);
}
/// passes data from the target, releases target memory and destroys
/// the host-target mapping (top entry from the stack of data maps)
/// created by the last __tgt_target_data_begin.
EXTERN void __tgt_target_data_end(int64_t device_id, int32_t arg_num,
void **args_base, void **args, int64_t *arg_sizes, int64_t *arg_types) {
if (IsOffloadDisabled()) return;
DP("Entering data end region with %d mappings\n", arg_num);
// No devices available?
if (device_id == OFFLOAD_DEVICE_DEFAULT) {
device_id = omp_get_default_device();
}
RTLsMtx.lock();
size_t Devices_size = Devices.size();
RTLsMtx.unlock();
if (Devices_size <= (size_t)device_id) {
DP("Device ID %" PRId64 " does not have a matching RTL.\n", device_id);
HandleTargetOutcome(false);
return;
}
DeviceTy &Device = Devices[device_id];
if (!Device.IsInit) {
DP("Uninit device: ignore");
HandleTargetOutcome(false);
return;
}
#ifdef OMPTARGET_DEBUG
for (int i=0; i<arg_num; ++i) {
DP("Entry %2d: Base=" DPxMOD ", Begin=" DPxMOD ", Size=%" PRId64
", Type=0x%" PRIx64 "\n", i, DPxPTR(args_base[i]), DPxPTR(args[i]),
arg_sizes[i], arg_types[i]);
}
#endif
int rc = target_data_end(Device, arg_num, args_base,
args, arg_sizes, arg_types);
HandleTargetOutcome(rc == OFFLOAD_SUCCESS);
}
EXTERN void __tgt_target_data_end_nowait(int64_t device_id, int32_t arg_num,
void **args_base, void **args, int64_t *arg_sizes, int64_t *arg_types,
int32_t depNum, void *depList, int32_t noAliasDepNum,
void *noAliasDepList) {
if (depNum + noAliasDepNum > 0)
__kmpc_omp_taskwait(NULL, 0);
__tgt_target_data_end(device_id, arg_num, args_base, args, arg_sizes,
arg_types);
}
EXTERN void __tgt_target_data_update(int64_t device_id, int32_t arg_num,
void **args_base, void **args, int64_t *arg_sizes, int64_t *arg_types) {
if (IsOffloadDisabled()) return;
DP("Entering data update with %d mappings\n", arg_num);
// No devices available?
if (device_id == OFFLOAD_DEVICE_DEFAULT) {
device_id = omp_get_default_device();
}
if (CheckDeviceAndCtors(device_id) != OFFLOAD_SUCCESS) {
DP("Failed to get device %" PRId64 " ready\n", device_id);
HandleTargetOutcome(false);
return;
}
DeviceTy& Device = Devices[device_id];
int rc = target_data_update(Device, arg_num, args_base,
args, arg_sizes, arg_types);
HandleTargetOutcome(rc == OFFLOAD_SUCCESS);
}
EXTERN void __tgt_target_data_update_nowait(
int64_t device_id, int32_t arg_num, void **args_base, void **args,
int64_t *arg_sizes, int64_t *arg_types, int32_t depNum, void *depList,
int32_t noAliasDepNum, void *noAliasDepList) {
if (depNum + noAliasDepNum > 0)
__kmpc_omp_taskwait(NULL, 0);
__tgt_target_data_update(device_id, arg_num, args_base, args, arg_sizes,
arg_types);
}
EXTERN int __tgt_target(int64_t device_id, void *host_ptr, int32_t arg_num,
void **args_base, void **args, int64_t *arg_sizes, int64_t *arg_types) {
if (IsOffloadDisabled()) return OFFLOAD_FAIL;
DP("Entering target region with entry point " DPxMOD " and device Id %"
PRId64 "\n", DPxPTR(host_ptr), device_id);
if (device_id == OFFLOAD_DEVICE_DEFAULT) {
device_id = omp_get_default_device();
}
if (CheckDeviceAndCtors(device_id) != OFFLOAD_SUCCESS) {
DP("Failed to get device %" PRId64 " ready\n", device_id);
HandleTargetOutcome(false);
return OFFLOAD_FAIL;
}
#ifdef OMPTARGET_DEBUG
for (int i=0; i<arg_num; ++i) {
DP("Entry %2d: Base=" DPxMOD ", Begin=" DPxMOD ", Size=%" PRId64
", Type=0x%" PRIx64 "\n", i, DPxPTR(args_base[i]), DPxPTR(args[i]),
arg_sizes[i], arg_types[i]);
}
#endif
int rc = target(device_id, host_ptr, arg_num, args_base, args, arg_sizes,
arg_types, 0, 0, false /*team*/);
HandleTargetOutcome(rc == OFFLOAD_SUCCESS);
return rc;
}
EXTERN int __tgt_target_nowait(int64_t device_id, void *host_ptr,
int32_t arg_num, void **args_base, void **args, int64_t *arg_sizes,
int64_t *arg_types, int32_t depNum, void *depList, int32_t noAliasDepNum,
void *noAliasDepList) {
if (depNum + noAliasDepNum > 0)
__kmpc_omp_taskwait(NULL, 0);
return __tgt_target(device_id, host_ptr, arg_num, args_base, args, arg_sizes,
arg_types);
}
EXTERN int __tgt_target_teams(int64_t device_id, void *host_ptr,
int32_t arg_num, void **args_base, void **args, int64_t *arg_sizes,
int64_t *arg_types, int32_t team_num, int32_t thread_limit) {
if (IsOffloadDisabled()) return OFFLOAD_FAIL;
DP("Entering target region with entry point " DPxMOD " and device Id %"
PRId64 "\n", DPxPTR(host_ptr), device_id);
if (device_id == OFFLOAD_DEVICE_DEFAULT) {
device_id = omp_get_default_device();
}
if (CheckDeviceAndCtors(device_id) != OFFLOAD_SUCCESS) {
DP("Failed to get device %" PRId64 " ready\n", device_id);
HandleTargetOutcome(false);
return OFFLOAD_FAIL;
}
#ifdef OMPTARGET_DEBUG
for (int i=0; i<arg_num; ++i) {
DP("Entry %2d: Base=" DPxMOD ", Begin=" DPxMOD ", Size=%" PRId64
", Type=0x%" PRIx64 "\n", i, DPxPTR(args_base[i]), DPxPTR(args[i]),
arg_sizes[i], arg_types[i]);
}
#endif
int rc = target(device_id, host_ptr, arg_num, args_base, args, arg_sizes,
arg_types, team_num, thread_limit, true /*team*/);
HandleTargetOutcome(rc == OFFLOAD_SUCCESS);
return rc;
}
EXTERN int __tgt_target_teams_nowait(int64_t device_id, void *host_ptr,
int32_t arg_num, void **args_base, void **args, int64_t *arg_sizes,
int64_t *arg_types, int32_t team_num, int32_t thread_limit, int32_t depNum,
void *depList, int32_t noAliasDepNum, void *noAliasDepList) {
if (depNum + noAliasDepNum > 0)
__kmpc_omp_taskwait(NULL, 0);
return __tgt_target_teams(device_id, host_ptr, arg_num, args_base, args,
arg_sizes, arg_types, team_num, thread_limit);
}
// The trip count mechanism will be revised - this scheme is not thread-safe.
EXTERN void __kmpc_push_target_tripcount(int64_t device_id,
uint64_t loop_tripcount) {
if (device_id == OFFLOAD_DEVICE_DEFAULT) {
device_id = omp_get_default_device();
}
if (CheckDeviceAndCtors(device_id) != OFFLOAD_SUCCESS) {
DP("Failed to get device %" PRId64 " ready\n", device_id);
HandleTargetOutcome(false);
return;
}
DP("__kmpc_push_target_tripcount(%" PRId64 ", %" PRIu64 ")\n", device_id,
loop_tripcount);
Devices[device_id].loopTripCnt = loop_tripcount;
}
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