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Diffstat (limited to 'liboffloadmic/plugin/libgomp-plugin-intelmic.cpp')
| -rw-r--r-- | liboffloadmic/plugin/libgomp-plugin-intelmic.cpp | 447 |
1 files changed, 447 insertions, 0 deletions
diff --git a/liboffloadmic/plugin/libgomp-plugin-intelmic.cpp b/liboffloadmic/plugin/libgomp-plugin-intelmic.cpp new file mode 100644 index 0000000..28ddbc3 --- /dev/null +++ b/liboffloadmic/plugin/libgomp-plugin-intelmic.cpp @@ -0,0 +1,447 @@ +/* Plugin for offload execution on Intel MIC devices. + + Copyright (C) 2014 Free Software Foundation, Inc. + + Contributed by Ilya Verbin <ilya.verbin@intel.com>. + + This file is part of the GNU OpenMP Library (libgomp). + + Libgomp is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3, or (at your option) + any later version. + + Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY + WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS + FOR A PARTICULAR PURPOSE. See the GNU General Public License for + more details. + + Under Section 7 of GPL version 3, you are granted additional + permissions described in the GCC Runtime Library Exception, version + 3.1, as published by the Free Software Foundation. + + You should have received a copy of the GNU General Public License and + a copy of the GCC Runtime Library Exception along with this program; + see the files COPYING3 and COPYING.RUNTIME respectively. If not, see + <http://www.gnu.org/licenses/>. */ + +/* Host side part of a libgomp plugin. */ + +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <utility> +#include <vector> +#include <libgomp_target.h> +#include "compiler_if_host.h" +#include "main_target_image.h" + +#define LD_LIBRARY_PATH_ENV "LD_LIBRARY_PATH" +#define MIC_LD_LIBRARY_PATH_ENV "MIC_LD_LIBRARY_PATH" + +#ifdef DEBUG +#define TRACE(...) \ +{ \ +fprintf (stderr, "HOST:\t%s:%s ", __FILE__, __FUNCTION__); \ +fprintf (stderr, __VA_ARGS__); \ +fprintf (stderr, "\n"); \ +} +#else +#define TRACE { } +#endif + + +static VarDesc vd_host2tgt = { + { 1, 1 }, /* dst, src */ + { 1, 0 }, /* in, out */ + 1, /* alloc_if */ + 1, /* free_if */ + 4, /* align */ + 0, /* mic_offset */ + { 0, 0, 0, 0, 0, 0, 0, 0 }, /* is_static, is_static_dstn, has_length, + is_stack_buf, sink_addr, alloc_disp, + is_noncont_src, is_noncont_dst */ + 0, /* offset */ + 0, /* size */ + 1, /* count */ + 0, /* alloc */ + 0, /* into */ + 0 /* ptr */ +}; + +static VarDesc vd_tgt2host = { + { 1, 1 }, /* dst, src */ + { 0, 1 }, /* in, out */ + 1, /* alloc_if */ + 1, /* free_if */ + 4, /* align */ + 0, /* mic_offset */ + { 0, 0, 0, 0, 0, 0, 0, 0 }, /* is_static, is_static_dstn, has_length, + is_stack_buf, sink_addr, alloc_disp, + is_noncont_src, is_noncont_dst */ + 0, /* offset */ + 0, /* size */ + 1, /* count */ + 0, /* alloc */ + 0, /* into */ + 0 /* ptr */ +}; + + +/* Total number of shared libraries with offloading to Intel MIC. */ +static int num_libraries; + +/* Pointers to the descriptors, containing pointers to host-side tables and to + target images. */ +static std::vector< std::pair<void *, void *> > lib_descrs; + +/* Thread-safe registration of the main image. */ +static pthread_once_t main_image_is_registered = PTHREAD_ONCE_INIT; + + +/* Add path specified in LD_LIBRARY_PATH to MIC_LD_LIBRARY_PATH, which is + required by liboffloadmic. */ +__attribute__((constructor)) +static void +set_mic_lib_path (void) +{ + const char *ld_lib_path = getenv (LD_LIBRARY_PATH_ENV); + const char *mic_lib_path = getenv (MIC_LD_LIBRARY_PATH_ENV); + + if (!ld_lib_path) + return; + + if (!mic_lib_path) + setenv (MIC_LD_LIBRARY_PATH_ENV, ld_lib_path, 1); + else + { + size_t len = strlen (mic_lib_path) + strlen (ld_lib_path) + 2; + bool use_alloca = len <= 2048; + char *mic_lib_path_new = (char *) (use_alloca ? alloca (len) + : malloc (len)); + if (!mic_lib_path_new) + { + fprintf (stderr, "%s: Can't allocate memory\n", __FILE__); + exit (1); + } + + sprintf (mic_lib_path_new, "%s:%s", mic_lib_path, ld_lib_path); + setenv (MIC_LD_LIBRARY_PATH_ENV, mic_lib_path_new, 1); + + if (!use_alloca) + free (mic_lib_path_new); + } +} + +extern "C" enum offload_target_type +GOMP_OFFLOAD_get_type (void) +{ + enum offload_target_type res = OFFLOAD_TARGET_TYPE_INTEL_MIC; + TRACE ("(): return %d", res); + return res; +} + +extern "C" int +GOMP_OFFLOAD_get_num_devices (void) +{ + int res = _Offload_number_of_devices (); + TRACE ("(): return %d", res); + return res; +} + +/* This should be called from every shared library with offloading. */ +extern "C" void +GOMP_OFFLOAD_register_image (void *host_table, void *target_image) +{ + TRACE ("(host_table = %p, target_image = %p)", host_table, target_image); + lib_descrs.push_back (std::make_pair (host_table, target_image)); + num_libraries++; +} + +static void +offload (const char *file, uint64_t line, int device, const char *name, + int num_vars, VarDesc *vars, VarDesc2 *vars2) +{ + OFFLOAD ofld = __offload_target_acquire1 (&device, file, line); + if (ofld) + __offload_offload1 (ofld, name, 0, num_vars, vars, vars2, 0, NULL, NULL); + else + { + fprintf (stderr, "%s:%d: Offload target acquire failed\n", file, line); + exit (1); + } +} + +static void +register_main_image () +{ + __offload_register_image (&main_target_image); +} + +/* Load offload_target_main on target. */ +extern "C" void +GOMP_OFFLOAD_init_device (int device) +{ + TRACE (""); + pthread_once (&main_image_is_registered, register_main_image); + offload (__FILE__, __LINE__, device, "__offload_target_init_proc", 0, + NULL, NULL); +} + +static void +get_target_table (int device, int &num_funcs, int &num_vars, void **&table) +{ + VarDesc vd1[2] = { vd_tgt2host, vd_tgt2host }; + vd1[0].ptr = &num_funcs; + vd1[0].size = sizeof (num_funcs); + vd1[1].ptr = &num_vars; + vd1[1].size = sizeof (num_vars); + VarDesc2 vd1g[2] = { { "num_funcs", 0 }, { "num_vars", 0 } }; + + offload (__FILE__, __LINE__, device, "__offload_target_table_p1", 2, + vd1, vd1g); + + int table_size = num_funcs + 2 * num_vars; + if (table_size > 0) + { + table = new void * [table_size]; + + VarDesc vd2; + vd2 = vd_tgt2host; + vd2.ptr = table; + vd2.size = table_size * sizeof (void *); + VarDesc2 vd2g = { "table", 0 }; + + offload (__FILE__, __LINE__, device, "__offload_target_table_p2", 1, + &vd2, &vd2g); + } +} + +static void +load_lib_and_get_table (int device, int lib_num, mapping_table *&table, + int &table_size) +{ + struct TargetImage { + int64_t size; + /* 10 characters is enough for max int value. */ + char name[sizeof ("lib0000000000.so")]; + char data[]; + } __attribute__ ((packed)); + + void ***host_table_descr = (void ***) lib_descrs[lib_num].first; + void **host_func_start = host_table_descr[0]; + void **host_func_end = host_table_descr[1]; + void **host_var_start = host_table_descr[2]; + void **host_var_end = host_table_descr[3]; + + void **target_image_descr = (void **) lib_descrs[lib_num].second; + void *image_start = target_image_descr[0]; + void *image_end = target_image_descr[1]; + + TRACE ("() host_table_descr { %p, %p, %p, %p }", host_func_start, + host_func_end, host_var_start, host_var_end); + TRACE ("() target_image_descr { %p, %p }", image_start, image_end); + + int64_t image_size = (uintptr_t) image_end - (uintptr_t) image_start; + TargetImage *image + = (TargetImage *) malloc (sizeof (int64_t) + sizeof ("lib0000000000.so") + + image_size); + if (!image) + { + fprintf (stderr, "%s: Can't allocate memory\n", __FILE__); + exit (1); + } + + image->size = image_size; + sprintf (image->name, "lib%010d.so", lib_num); + memcpy (image->data, image_start, image->size); + + TRACE ("() __offload_register_image %s { %p, %d }", + image->name, image_start, image->size); + __offload_register_image (image); + + int tgt_num_funcs = 0; + int tgt_num_vars = 0; + void **tgt_table = NULL; + get_target_table (device, tgt_num_funcs, tgt_num_vars, tgt_table); + free (image); + + /* The func table contains only addresses, the var table contains addresses + and corresponding sizes. */ + int host_num_funcs = host_func_end - host_func_start; + int host_num_vars = (host_var_end - host_var_start) / 2; + TRACE ("() host_num_funcs = %d, tgt_num_funcs = %d", + host_num_funcs, tgt_num_funcs); + TRACE ("() host_num_vars = %d, tgt_num_vars = %d", + host_num_vars, tgt_num_vars); + if (host_num_funcs != tgt_num_funcs) + { + fprintf (stderr, "%s: Can't map target functions\n", __FILE__); + exit (1); + } + if (host_num_vars != tgt_num_vars) + { + fprintf (stderr, "%s: Can't map target variables\n", __FILE__); + exit (1); + } + + table = (mapping_table *) realloc (table, (table_size + host_num_funcs + + host_num_vars) + * sizeof (mapping_table)); + if (table == NULL) + { + fprintf (stderr, "%s: Can't allocate memory\n", __FILE__); + exit (1); + } + + for (int i = 0; i < host_num_funcs; i++) + { + mapping_table t; + t.host_start = (uintptr_t) host_func_start[i]; + t.host_end = t.host_start + 1; + t.tgt_start = (uintptr_t) tgt_table[i]; + t.tgt_end = t.tgt_start + 1; + + TRACE ("() lib %d, func %d:\t0x%llx -- 0x%llx", + lib_num, i, t.host_start, t.tgt_start); + + table[table_size++] = t; + } + + for (int i = 0; i < host_num_vars * 2; i += 2) + { + mapping_table t; + t.host_start = (uintptr_t) host_var_start[i]; + t.host_end = t.host_start + (uintptr_t) host_var_start[i+1]; + t.tgt_start = (uintptr_t) tgt_table[tgt_num_funcs+i]; + t.tgt_end = t.tgt_start + (uintptr_t) tgt_table[tgt_num_funcs+i+1]; + + TRACE ("() lib %d, var %d:\t0x%llx (%d) -- 0x%llx (%d)", lib_num, i/2, + t.host_start, t.host_end - t.host_start, + t.tgt_start, t.tgt_end - t.tgt_start); + + table[table_size++] = t; + } + + delete [] tgt_table; +} + +extern "C" int +GOMP_OFFLOAD_get_table (int device, void *result) +{ + TRACE ("(num_libraries = %d)", num_libraries); + + mapping_table *table = NULL; + int table_size = 0; + + for (int i = 0; i < num_libraries; i++) + load_lib_and_get_table (device, i, table, table_size); + + *(void **) result = table; + return table_size; +} + +extern "C" void * +GOMP_OFFLOAD_alloc (int device, size_t size) +{ + TRACE ("(size = %d)", size); + + void *tgt_ptr; + VarDesc vd1[2] = { vd_host2tgt, vd_tgt2host }; + vd1[0].ptr = &size; + vd1[0].size = sizeof (size); + vd1[1].ptr = &tgt_ptr; + vd1[1].size = sizeof (void *); + VarDesc2 vd1g[2] = { { "size", 0 }, { "tgt_ptr", 0 } }; + + offload (__FILE__, __LINE__, device, "__offload_target_alloc", 2, vd1, vd1g); + + return tgt_ptr; +} + +extern "C" void +GOMP_OFFLOAD_free (int device, void *tgt_ptr) +{ + TRACE ("(tgt_ptr = %p)", tgt_ptr); + + VarDesc vd1 = vd_host2tgt; + vd1.ptr = &tgt_ptr; + vd1.size = sizeof (void *); + VarDesc2 vd1g = { "tgt_ptr", 0 }; + + offload (__FILE__, __LINE__, device, "__offload_target_free", 1, &vd1, &vd1g); +} + +extern "C" void * +GOMP_OFFLOAD_host2dev (int device, void *tgt_ptr, const void *host_ptr, + size_t size) +{ + TRACE ("(tgt_ptr = %p, host_ptr = %p, size = %d)", tgt_ptr, host_ptr, size); + if (!size) + return tgt_ptr; + + VarDesc vd1[2] = { vd_host2tgt, vd_host2tgt }; + vd1[0].ptr = &tgt_ptr; + vd1[0].size = sizeof (void *); + vd1[1].ptr = &size; + vd1[1].size = sizeof (size); + VarDesc2 vd1g[2] = { { "tgt_ptr", 0 }, { "size", 0 } }; + + offload (__FILE__, __LINE__, device, "__offload_target_host2tgt_p1", 2, + vd1, vd1g); + + VarDesc vd2 = vd_host2tgt; + vd2.ptr = (void *) host_ptr; + vd2.size = size; + VarDesc2 vd2g = { "var", 0 }; + + offload (__FILE__, __LINE__, device, "__offload_target_host2tgt_p2", 1, + &vd2, &vd2g); + + return tgt_ptr; +} + +extern "C" void * +GOMP_OFFLOAD_dev2host (int device, void *host_ptr, const void *tgt_ptr, + size_t size) +{ + TRACE ("(host_ptr = %p, tgt_ptr = %p, size = %d)", host_ptr, tgt_ptr, size); + if (!size) + return host_ptr; + + VarDesc vd1[2] = { vd_host2tgt, vd_host2tgt }; + vd1[0].ptr = &tgt_ptr; + vd1[0].size = sizeof (void *); + vd1[1].ptr = &size; + vd1[1].size = sizeof (size); + VarDesc2 vd1g[2] = { { "tgt_ptr", 0 }, { "size", 0 } }; + + offload (__FILE__, __LINE__, device, "__offload_target_tgt2host_p1", 2, + vd1, vd1g); + + VarDesc vd2 = vd_tgt2host; + vd2.ptr = (void *) host_ptr; + vd2.size = size; + VarDesc2 vd2g = { "var", 0 }; + + offload (__FILE__, __LINE__, device, "__offload_target_tgt2host_p2", 1, + &vd2, &vd2g); + + return host_ptr; +} + +extern "C" void +GOMP_OFFLOAD_run (int device, void *tgt_fn, void *tgt_vars) +{ + TRACE ("(tgt_fn = %p, tgt_vars = %p)", tgt_fn, tgt_vars); + + VarDesc vd1[2] = { vd_host2tgt, vd_host2tgt }; + vd1[0].ptr = &tgt_fn; + vd1[0].size = sizeof (void *); + vd1[1].ptr = &tgt_vars; + vd1[1].size = sizeof (void *); + VarDesc2 vd1g[2] = { { "tgt_fn", 0 }, { "tgt_vars", 0 } }; + + offload (__FILE__, __LINE__, device, "__offload_target_run", 2, vd1, vd1g); +} |