Simplified handling of GPU device IDs

[gromacs.git] / src / gromacs / gpu_utils / gpu_utils_ocl.cpp

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/*! \internal \file
 *  \brief Define functions for detection and initialization for OpenCL devices.
 *
 *  \author Anca Hamuraru <anca@streamcomputing.eu>
 *  \author Dimitrios Karkoulis <dimitris.karkoulis@gmail.com>
 *  \author Teemu Virolainen <teemu@streamcomputing.eu>
 */

#include "gmxpre.h"

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef __APPLE__
#    include <sys/sysctl.h>
#endif

#include <memory.h>

#include "gromacs/gpu_utils/gpu_utils.h"
#include "gromacs/gpu_utils/ocl_compiler.h"
#include "gromacs/gpu_utils/oclutils.h"
#include "gromacs/hardware/hw_info.h"
#include "gromacs/mdtypes/md_enums.h"
#include "gromacs/utility/cstringutil.h"
#include "gromacs/utility/fatalerror.h"
#include "gromacs/utility/smalloc.h"

/*! \brief Helper macro for error handling */
#define CALLOCLFUNC_LOGERROR(func, err_str, retval) { \
        cl_int opencl_ret = func; \
        if (CL_SUCCESS != opencl_ret) \
        { \
            sprintf(err_str, "OpenCL error %d", opencl_ret); \
            retval = -1; \
        } \
        else{ \
            retval = 0; } \
}


/*! \brief Return true if executing on compatible OS for AMD OpenCL.
 *
 * This is assumed to be true for OS X version of at least 10.10.4 and
 * all other OS flavors.
 *
 * Uses the BSD sysctl() interfaces to extract the kernel version.
 *
 * \return true if version is 14.4 or later (= OS X version 10.10.4),
 *         or OS is not Darwin.
 */
static bool
runningOnCompatibleOSForAmd()
{
#ifdef __APPLE__
    int    mib[2];
    char   kernelVersion[256];
    size_t len = sizeof(kernelVersion);

    mib[0] = CTL_KERN;
    mib[1] = KERN_OSRELEASE;

    sysctl(mib, sizeof(mib)/sizeof(mib[0]), kernelVersion, &len, NULL, 0);

    int major = strtod(kernelVersion, NULL);
    int minor = strtod(strchr(kernelVersion, '.')+1, NULL);

    // Kernel 14.4 corresponds to OS X 10.10.4
    return (major > 14 || (major == 14 && minor >= 4));
#else
    return true;
#endif
}

/*! \brief Returns true if the gpu characterized by the device properties is
 *  supported by the native gpu acceleration.
 * \returns             true if the GPU properties passed indicate a compatible
 *                      GPU, otherwise false.
 */
static int is_gmx_supported_gpu_id(struct gmx_device_info_t *ocl_gpu_device)
{
    if ((getenv("GMX_OCL_DISABLE_COMPATIBILITY_CHECK")) != NULL)
    {
        return egpuCompatible;
    }

    /* Only AMD and NVIDIA GPUs are supported for now */
    switch (ocl_gpu_device->vendor_e)
    {
        case OCL_VENDOR_NVIDIA:
            return egpuCompatible;
        case OCL_VENDOR_AMD:
            return runningOnCompatibleOSForAmd() ? egpuCompatible : egpuIncompatible;
        default:
            return egpuIncompatible;
    }
}


/*! \brief Returns an ocl_vendor_id_t value corresponding to the input OpenCL vendor name.
 *
 *  \param[in] vendor_name String with OpenCL vendor name.
 *  \returns               ocl_vendor_id_t value for the input vendor_name
 */
static ocl_vendor_id_t get_vendor_id(char *vendor_name)
{
    if (vendor_name)
    {
        if (strstr(vendor_name, "NVIDIA"))
        {
            return OCL_VENDOR_NVIDIA;
        }
        else
        if (strstr(vendor_name, "AMD") ||
            strstr(vendor_name, "Advanced Micro Devices"))
        {
            return OCL_VENDOR_AMD;
        }
        else
        if (strstr(vendor_name, "Intel"))
        {
            return OCL_VENDOR_INTEL;
        }
    }
    return OCL_VENDOR_UNKNOWN;
}


//! This function is documented in the header file
int detect_gpus(gmx_gpu_info_t *gpu_info, char *err_str)
{
    int             retval;
    cl_uint         ocl_platform_count;
    cl_platform_id *ocl_platform_ids;
    cl_device_type  req_dev_type = CL_DEVICE_TYPE_GPU;

    retval           = 0;
    ocl_platform_ids = NULL;

    if (getenv("GMX_OCL_FORCE_CPU") != NULL)
    {
        req_dev_type = CL_DEVICE_TYPE_CPU;
    }

    while (1)
    {
        CALLOCLFUNC_LOGERROR(clGetPlatformIDs(0, NULL, &ocl_platform_count), err_str, retval)
        if (0 != retval)
        {
            break;
        }

        if (1 > ocl_platform_count)
        {
            break;
        }

        snew(ocl_platform_ids, ocl_platform_count);

        CALLOCLFUNC_LOGERROR(clGetPlatformIDs(ocl_platform_count, ocl_platform_ids, NULL), err_str, retval)
        if (0 != retval)
        {
            break;
        }

        for (unsigned int i = 0; i < ocl_platform_count; i++)
        {
            cl_uint ocl_device_count;

            /* If requesting req_dev_type devices fails, just go to the next platform */
            if (CL_SUCCESS != clGetDeviceIDs(ocl_platform_ids[i], req_dev_type, 0, NULL, &ocl_device_count))
            {
                continue;
            }

            if (1 <= ocl_device_count)
            {
                gpu_info->n_dev += ocl_device_count;
            }
        }

        if (1 > gpu_info->n_dev)
        {
            break;
        }

        snew(gpu_info->gpu_dev, gpu_info->n_dev);

        {
            int           device_index;
            cl_device_id *ocl_device_ids;

            snew(ocl_device_ids, gpu_info->n_dev);
            device_index = 0;

            for (unsigned int i = 0; i < ocl_platform_count; i++)
            {
                cl_uint ocl_device_count;

                /* If requesting req_dev_type devices fails, just go to the next platform */
                if (CL_SUCCESS != clGetDeviceIDs(ocl_platform_ids[i], req_dev_type, gpu_info->n_dev, ocl_device_ids, &ocl_device_count))
                {
                    continue;
                }

                if (1 > ocl_device_count)
                {
                    break;
                }

                for (unsigned int j = 0; j < ocl_device_count; j++)
                {
                    gpu_info->gpu_dev[device_index].ocl_gpu_id.ocl_platform_id = ocl_platform_ids[i];
                    gpu_info->gpu_dev[device_index].ocl_gpu_id.ocl_device_id   = ocl_device_ids[j];

                    gpu_info->gpu_dev[device_index].device_name[0] = 0;
                    clGetDeviceInfo(ocl_device_ids[j], CL_DEVICE_NAME, sizeof(gpu_info->gpu_dev[device_index].device_name), gpu_info->gpu_dev[device_index].device_name, NULL);

                    gpu_info->gpu_dev[device_index].device_version[0] = 0;
                    clGetDeviceInfo(ocl_device_ids[j], CL_DEVICE_VERSION, sizeof(gpu_info->gpu_dev[device_index].device_version), gpu_info->gpu_dev[device_index].device_version, NULL);

                    gpu_info->gpu_dev[device_index].device_vendor[0] = 0;
                    clGetDeviceInfo(ocl_device_ids[j], CL_DEVICE_VENDOR, sizeof(gpu_info->gpu_dev[device_index].device_vendor), gpu_info->gpu_dev[device_index].device_vendor, NULL);

                    gpu_info->gpu_dev[device_index].compute_units = 0;
                    clGetDeviceInfo(ocl_device_ids[j], CL_DEVICE_MAX_COMPUTE_UNITS, sizeof(gpu_info->gpu_dev[device_index].compute_units), &(gpu_info->gpu_dev[device_index].compute_units), NULL);

                    gpu_info->gpu_dev[device_index].adress_bits = 0;
                    clGetDeviceInfo(ocl_device_ids[j], CL_DEVICE_ADDRESS_BITS, sizeof(gpu_info->gpu_dev[device_index].adress_bits), &(gpu_info->gpu_dev[device_index].adress_bits), NULL);

                    gpu_info->gpu_dev[device_index].vendor_e = get_vendor_id(gpu_info->gpu_dev[device_index].device_vendor);

                    gpu_info->gpu_dev[device_index].stat = is_gmx_supported_gpu_id(gpu_info->gpu_dev + device_index);

                    if (egpuCompatible == gpu_info->gpu_dev[device_index].stat)
                    {
                        gpu_info->n_dev_compatible++;
                    }

                    device_index++;
                }
            }

            gpu_info->n_dev = device_index;

            /* Dummy sort of devices -  AMD first, then NVIDIA, then Intel */
            // TODO: Sort devices based on performance.
            if (0 < gpu_info->n_dev)
            {
                int last = -1;
                for (int i = 0; i < gpu_info->n_dev; i++)
                {
                    if (OCL_VENDOR_AMD == gpu_info->gpu_dev[i].vendor_e)
                    {
                        last++;

                        if (last < i)
                        {
                            gmx_device_info_t ocl_gpu_info;
                            ocl_gpu_info            = gpu_info->gpu_dev[i];
                            gpu_info->gpu_dev[i]    = gpu_info->gpu_dev[last];
                            gpu_info->gpu_dev[last] = ocl_gpu_info;
                        }
                    }
                }

                /* if more than 1 device left to be sorted */
                if ((gpu_info->n_dev - 1 - last) > 1)
                {
                    for (int i = 0; i < gpu_info->n_dev; i++)
                    {
                        if (OCL_VENDOR_NVIDIA == gpu_info->gpu_dev[i].vendor_e)
                        {
                            last++;

                            if (last < i)
                            {
                                gmx_device_info_t ocl_gpu_info;
                                ocl_gpu_info            = gpu_info->gpu_dev[i];
                                gpu_info->gpu_dev[i]    = gpu_info->gpu_dev[last];
                                gpu_info->gpu_dev[last] = ocl_gpu_info;
                            }
                        }
                    }
                }
            }

            sfree(ocl_device_ids);
        }

        break;
    }

    sfree(ocl_platform_ids);

    return retval;
}

//! This function is documented in the header file
void free_gpu_info(const gmx_gpu_info_t gmx_unused *gpu_info)
{
    if (gpu_info == NULL)
    {
        return;
    }

    sfree(gpu_info->gpu_dev);
}

//! This function is documented in the header file
bool isGpuCompatible(const gmx_gpu_info_t &gpu_info,
                     int                   index)
{
    return (index >= gpu_info.n_dev ?
            false :
            gpu_info.gpu_dev[index].stat == egpuCompatible);
}

//! This function is documented in the header file
const char *getGpuCompatibilityDescription(const gmx_gpu_info_t &gpu_info,
                                           int                   index)
{
    return (index >= gpu_info.n_dev ?
            gpu_detect_res_str[egpuNonexistent] :
            gpu_detect_res_str[gpu_info.gpu_dev[index].stat]);
}

//! This function is documented in the header file
void get_gpu_device_info_string(char *s, const gmx_gpu_info_t &gpu_info, int index)
{
    assert(s);

    if (index < 0 && index >= gpu_info.n_dev)
    {
        return;
    }

    gmx_device_info_t  *dinfo = &gpu_info.gpu_dev[index];

    bool                bGpuExists =
        dinfo->stat == egpuCompatible ||
        dinfo->stat == egpuIncompatible;

    if (!bGpuExists)
    {
        sprintf(s, "#%d: %s, stat: %s",
                index, "N/A",
                gpu_detect_res_str[dinfo->stat]);
    }
    else
    {
        sprintf(s, "#%d: name: %s, vendor: %s, device version: %s, stat: %s",
                index, dinfo->device_name, dinfo->device_vendor,
                dinfo->device_version,
                gpu_detect_res_str[dinfo->stat]);
    }
}

//! This function is documented in the header file
void init_gpu(const gmx::MDLogger               & /*mdlog*/,
              int                               /* rank */,
              gmx_device_info_t                *deviceInfo)
{
    assert(deviceInfo);

    // If the device is NVIDIA, for safety reasons we disable the JIT
    // caching as this is known to be broken at least until driver 364.19;
    // the cache does not always get regenerated when the source code changes,
    // e.g. if the path to the kernel sources remains the same

    if (deviceInfo->vendor_e == OCL_VENDOR_NVIDIA)
    {
        // Ignore return values, failing to set the variable does not mean
        // that something will go wrong later.
#ifdef _MSC_VER
        _putenv("CUDA_CACHE_DISABLE=1");
#else
        // Don't override, maybe a dev is testing.
        setenv("CUDA_CACHE_DISABLE", "1", 0);
#endif
    }
}

//! This function is documented in the header file
gmx_device_info_t *getDeviceInfo(const gmx_gpu_info_t &gpu_info,
                                 int                   deviceId)
{
    if (deviceId < 0 || deviceId >= gpu_info.n_dev)
    {
        gmx_incons("Invalid GPU deviceId requested");
    }
    return &gpu_info.gpu_dev[deviceId];
}

//! This function is documented in the header file
size_t sizeof_gpu_dev_info(void)
{
    return sizeof(gmx_device_info_t);
}

/*! \brief Prints the name of a kernel function pointer.
 *
 * \param[in]    kernel   OpenCL kernel
 * \returns               CL_SUCCESS if the operation was successful, an OpenCL error otherwise.
 */
cl_int dbg_ocl_kernel_name(const cl_kernel kernel)
{
    cl_int cl_error;
    char   kernel_name[256];
    cl_error = clGetKernelInfo(kernel, CL_KERNEL_FUNCTION_NAME,
                               sizeof(kernel_name), &kernel_name, NULL);
    if (cl_error)
    {
        printf("No kernel found!\n");
    }
    else
    {
        printf("%s\n", kernel_name);
    }
    return cl_error;
}

/*! \brief Prints the name of a kernel function pointer.
 *
 * \param[in]    kernel   OpenCL kernel
 * \returns               CL_SUCCESS if the operation was successful, an OpenCL error otherwise.
 */
cl_int dbg_ocl_kernel_name_address(void* kernel)
{
    cl_int cl_error;
    char   kernel_name[256];
    cl_error = clGetKernelInfo((cl_kernel)kernel, CL_KERNEL_FUNCTION_NAME,
                               sizeof(kernel_name), &kernel_name, NULL);
    if (cl_error)
    {
        printf("No kernel found!\n");
    }
    else
    {
        printf("%s\n", kernel_name);
    }
    return cl_error;
}

void gpu_set_host_malloc_and_free(bool               bUseGpuKernels,
                                  gmx_host_alloc_t **nb_alloc,
                                  gmx_host_free_t  **nb_free)
{
    if (bUseGpuKernels)
    {
        *nb_alloc = &ocl_pmalloc;
        *nb_free  = &ocl_pfree;
    }
    else
    {
        *nb_alloc = NULL;
        *nb_free  = NULL;
    }
}