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//===--- amdgpu/impl/atmi.cpp ------------------------------------- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "atmi_runtime.h"
#include "hsa_api.h"
#include "internal.h"
#include "rt.h"
#include <memory>
/*
* Data
*/
static hsa_status_t invoke_hsa_copy(hsa_signal_t sig, void *dest,
const void *src, size_t size,
hsa_agent_t agent) {
const hsa_signal_value_t init = 1;
const hsa_signal_value_t success = 0;
hsa_signal_store_screlease(sig, init);
hsa_status_t err =
hsa_amd_memory_async_copy(dest, agent, src, agent, size, 0, NULL, sig);
if (err != HSA_STATUS_SUCCESS) {
return err;
}
// async_copy reports success by decrementing and failure by setting to < 0
hsa_signal_value_t got = init;
while (got == init) {
got = hsa_signal_wait_scacquire(sig, HSA_SIGNAL_CONDITION_NE, init,
UINT64_MAX, ATMI_WAIT_STATE);
}
if (got != success) {
return HSA_STATUS_ERROR;
}
return err;
}
struct atmiFreePtrDeletor {
void operator()(void *p) {
core::Runtime::Memfree(p); // ignore failure to free
}
};
hsa_status_t atmi_memcpy_h2d(hsa_signal_t signal, void *deviceDest,
const void *hostSrc, size_t size,
hsa_agent_t agent) {
hsa_status_t rc = hsa_memory_copy(deviceDest, hostSrc, size);
// hsa_memory_copy sometimes fails in situations where
// allocate + copy succeeds. Looks like it might be related to
// locking part of a read only segment. Fall back for now.
if (rc == HSA_STATUS_SUCCESS) {
return HSA_STATUS_SUCCESS;
}
void *tempHostPtr;
hsa_status_t ret = core::Runtime::HostMalloc(&tempHostPtr, size);
if (ret != HSA_STATUS_SUCCESS) {
DEBUG_PRINT("HostMalloc: Unable to alloc %zu bytes for temp scratch\n",
size);
return ret;
}
std::unique_ptr<void, atmiFreePtrDeletor> del(tempHostPtr);
memcpy(tempHostPtr, hostSrc, size);
if (invoke_hsa_copy(signal, deviceDest, tempHostPtr, size, agent) !=
HSA_STATUS_SUCCESS) {
return HSA_STATUS_ERROR;
}
return HSA_STATUS_SUCCESS;
}
hsa_status_t atmi_memcpy_d2h(hsa_signal_t signal, void *dest,
const void *deviceSrc, size_t size,
hsa_agent_t agent) {
hsa_status_t rc = hsa_memory_copy(dest, deviceSrc, size);
// hsa_memory_copy sometimes fails in situations where
// allocate + copy succeeds. Looks like it might be related to
// locking part of a read only segment. Fall back for now.
if (rc == HSA_STATUS_SUCCESS) {
return HSA_STATUS_SUCCESS;
}
void *tempHostPtr;
hsa_status_t ret = core::Runtime::HostMalloc(&tempHostPtr, size);
if (ret != HSA_STATUS_SUCCESS) {
DEBUG_PRINT("HostMalloc: Unable to alloc %zu bytes for temp scratch\n",
size);
return ret;
}
std::unique_ptr<void, atmiFreePtrDeletor> del(tempHostPtr);
if (invoke_hsa_copy(signal, tempHostPtr, deviceSrc, size, agent) !=
HSA_STATUS_SUCCESS) {
return HSA_STATUS_ERROR;
}
memcpy(dest, tempHostPtr, size);
return HSA_STATUS_SUCCESS;
}
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