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/*
* Copyright © 2014 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including
* the next paragraph) shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include "libhsakmt.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h>
#include "fmm.h"
static const char kfd_device_name[] = "/dev/kfd";
static const char tmp_file[] = "/var/lock/.amd_hsa_thunk_lock";
int amd_hsa_thunk_lock_fd = 0;
HSAKMT_STATUS
HSAKMTAPI
hsaKmtOpenKFD(void)
{
HSAKMT_STATUS result;
pthread_mutex_lock(&hsakmt_mutex);
if (kfd_open_count == 0)
{
int fd = open(kfd_device_name, O_RDWR | O_CLOEXEC);
if (fd != -1)
{
kfd_fd = fd;
kfd_open_count = 1;
result = fmm_init_process_apertures();
if (result != HSAKMT_STATUS_SUCCESS)
close(fd);
}
else
{
result = HSAKMT_STATUS_KERNEL_IO_CHANNEL_NOT_OPENED;
}
amd_hsa_thunk_lock_fd = open(tmp_file,
O_CREAT | //create the file if it's not present.
O_RDWR, //only need write access for the internal locking semantics.
S_IRUSR | S_IWUSR); //permissions on the file, 600 here.
}
else
{
kfd_open_count++;
result = HSAKMT_STATUS_SUCCESS;
}
pthread_mutex_unlock(&hsakmt_mutex);
return result;
}
HSAKMT_STATUS
HSAKMTAPI
hsaKmtCloseKFD(void)
{
HSAKMT_STATUS result;
pthread_mutex_lock(&hsakmt_mutex);
if (kfd_open_count > 0)
{
if (--kfd_open_count == 0)
{
close(kfd_fd);
if (amd_hsa_thunk_lock_fd > 0) {
close(amd_hsa_thunk_lock_fd);
unlink(tmp_file);
}
}
result = HSAKMT_STATUS_SUCCESS;
}
else
{
result = HSAKMT_STATUS_KERNEL_IO_CHANNEL_NOT_OPENED;
}
pthread_mutex_unlock(&hsakmt_mutex);
return result;
}
extern int kfd_ioctl(int cmdcode, void* data)
{
return ioctl(kfd_fd, cmdcode, data);
}
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