1 // Copyright 2006 Google Inc. All Rights Reserved.
2 // Author: nsanders, menderico
4 // Licensed under the Apache License, Version 2.0 (the "License");
5 // you may not use this file except in compliance with the License.
6 // You may obtain a copy of the License at
8 // http://www.apache.org/licenses/LICENSE-2.0
10 // Unless required by applicable law or agreed to in writing, software
11 // distributed under the License is distributed on an "AS IS" BASIS,
12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 // See the License for the specific language governing permissions and
14 // limitations under the License.
16 // os.cc : os and machine specific implementation
17 // This file includes an abstracted interface
18 // for linux-distro specific and HW specific
25 #include <linux/types.h>
31 #include <sys/ioctl.h>
33 #include <sys/types.h>
41 #define SHM_HUGETLB 04000 // remove when glibc defines it
47 // This file must work with autoconf on its public version,
48 // so these includes are correct.
50 #include "error_diag.h"
52 // OsLayer initialization.
57 min_hugepages_bytes_ = 0;
59 use_hugepages_ = false;
60 use_posix_shm_ = false;
61 dynamic_mapped_shmem_ = false;
64 time_initialized_ = 0;
70 num_cpus_per_node_ = 0;
72 err_log_callback_ = 0;
73 error_injection_ = false;
76 address_mode_ = sizeof(pvoid) * 8;
81 use_flush_page_cache_ = false;
87 delete error_diagnoser_;
90 // OsLayer initialization.
91 bool OsLayer::Initialize() {
92 time_initialized_ = time(NULL);
93 // Detect asm support.
98 num_cpus_ = sysconf(_SC_NPROCESSORS_ONLN);
99 num_cpus_per_node_ = num_cpus_ / num_nodes_;
101 logprintf(5, "Log: %d nodes, %d cpus.\n", num_nodes_, num_cpus_);
102 sat_assert(CPU_SETSIZE >= num_cpus_);
103 cpu_sets_.resize(num_nodes_);
104 cpu_sets_valid_.resize(num_nodes_);
105 // Create error diagnoser.
106 error_diagnoser_ = new ErrorDiag();
107 if (!error_diagnoser_->set_os(this))
112 // Machine type detected. Can we implement all these functions correctly?
113 bool OsLayer::IsSupported() {
115 // There are no explicitly supported systems in open source version.
119 // This is the default empty implementation.
120 // SAT won't report full error information.
124 int OsLayer::AddressMode() {
125 // Detect 32/64 bit binary.
127 return sizeof(pvoid) * 8;
130 // Translates user virtual to physical address.
131 uint64 OsLayer::VirtualToPhysical(void *vaddr) {
133 off64_t off = ((uintptr_t)vaddr) / getpagesize() * 8;
134 int fd = open(kPagemapPath, O_RDONLY);
135 if (fd < 0 || lseek64(fd, off, SEEK_SET) != off || read(fd, &frame, 8) != 8) {
137 string errtxt = ErrorString(err);
138 logprintf(0, "Error: failed to access %s with errno %d (%s)\n",
139 kPagemapPath, err, errtxt.c_str());
145 if (!(frame & (1LL << 63)) || (frame & (1LL << 62)))
147 shift = (frame >> 55) & 0x3f;
148 frame = (frame & 0x007fffffffffffffLL) << shift;
149 return frame | ((uintptr_t)vaddr & ((1LL << shift) - 1));
152 // Returns the HD device that contains this file.
153 string OsLayer::FindFileDevice(string filename) {
157 // Returns a list of locations corresponding to HD devices.
158 list<string> OsLayer::FindFileDevices() {
159 // No autodetection on unknown systems.
160 list<string> locations;
165 // Get HW core features from cpuid instruction.
166 void OsLayer::GetFeatures() {
167 #if defined(STRESSAPPTEST_CPU_X86_64) || defined(STRESSAPPTEST_CPU_I686)
168 // CPUID features documented at:
169 // http://www.sandpile.org/ia32/cpuid.htm
171 __asm__ __volatile__ (
172 "cpuid": "=a" (ax), "=b" (bx), "=c" (cx), "=d" (dx) : "a" (1));
173 has_clflush_ = (dx >> 19) & 1;
174 has_sse2_ = (dx >> 26) & 1;
176 logprintf(9, "Log: has clflush: %s, has sse2: %s\n",
177 has_clflush_ ? "true" : "false",
178 has_sse2_ ? "true" : "false");
179 #elif defined(STRESSAPPTEST_CPU_PPC)
180 // All PPC implementations have cache flush instructions.
182 #elif defined(STRESSAPPTEST_CPU_ARMV7A)
183 #warning "Unsupported CPU type ARMV7A: unable to determine feature set."
185 #warning "Unsupported CPU type: unable to determine feature set."
190 // Enable FlushPageCache to be functional instead of a NOP.
191 void OsLayer::ActivateFlushPageCache(void) {
192 logprintf(9, "Log: page cache will be flushed as needed\n");
193 use_flush_page_cache_ = true;
196 // Flush the page cache to ensure reads come from the disk.
197 bool OsLayer::FlushPageCache(void) {
198 if (!use_flush_page_cache_)
201 // First, ask the kernel to write the cache to the disk.
204 // Second, ask the kernel to empty the cache by writing "1" to
205 // "/proc/sys/vm/drop_caches".
206 static const char *drop_caches_file = "/proc/sys/vm/drop_caches";
207 int dcfile = open(drop_caches_file, O_WRONLY);
210 string errtxt = ErrorString(err);
211 logprintf(3, "Log: failed to open %s - err %d (%s)\n",
212 drop_caches_file, err, errtxt.c_str());
216 ssize_t bytes_written = write(dcfile, "1", 1);
219 if (bytes_written != 1) {
221 string errtxt = ErrorString(err);
222 logprintf(3, "Log: failed to write %s - err %d (%s)\n",
223 drop_caches_file, err, errtxt.c_str());
230 // We need to flush the cacheline here.
231 void OsLayer::Flush(void *vaddr) {
232 // Use the generic flush. This function is just so we can override
233 // this if we are so inclined.
239 // Run C or ASM copy as appropriate..
240 bool OsLayer::AdlerMemcpyWarm(uint64 *dstmem, uint64 *srcmem,
241 unsigned int size_in_bytes,
242 AdlerChecksum *checksum) {
244 return AdlerMemcpyAsm(dstmem, srcmem, size_in_bytes, checksum);
246 return AdlerMemcpyWarmC(dstmem, srcmem, size_in_bytes, checksum);
251 // Translate user virtual to physical address.
252 int OsLayer::FindDimm(uint64 addr, char *buf, int len) {
254 snprintf(tmpbuf, sizeof(tmpbuf), "DIMM Unknown");
255 snprintf(buf, len, "%s", tmpbuf);
260 // Classifies addresses according to "regions"
261 // This isn't really implemented meaningfully here..
262 int32 OsLayer::FindRegion(uint64 addr) {
263 static bool warned = false;
265 if (regionsize_ == 0) {
266 regionsize_ = totalmemsize_ / 8;
267 if (regionsize_ < 512 * kMegabyte)
268 regionsize_ = 512 * kMegabyte;
269 regioncount_ = totalmemsize_ / regionsize_;
270 if (regioncount_ < 1) regioncount_ = 1;
273 int32 region_num = addr / regionsize_;
274 if (region_num >= regioncount_) {
276 logprintf(0, "Log: region number %d exceeds region count %d\n",
277 region_num, regioncount_);
280 region_num = region_num % regioncount_;
285 // Report which cores are associated with a given region.
286 cpu_set_t *OsLayer::FindCoreMask(int32 region) {
287 sat_assert(region >= 0);
288 region %= num_nodes_;
289 if (!cpu_sets_valid_[region]) {
290 CPU_ZERO(&cpu_sets_[region]);
291 for (int i = 0; i < num_cpus_per_node_; ++i) {
292 CPU_SET(i + region * num_cpus_per_node_, &cpu_sets_[region]);
294 cpu_sets_valid_[region] = true;
295 logprintf(5, "Log: Region %d mask 0x%s\n",
296 region, FindCoreMaskFormat(region).c_str());
298 return &cpu_sets_[region];
301 // Return cores associated with a given region in hex string.
302 string OsLayer::FindCoreMaskFormat(int32 region) {
303 cpu_set_t* mask = FindCoreMask(region);
304 string format = cpuset_format(mask);
305 if (format.size() < 8)
306 format = string(8 - format.size(), '0') + format;
310 // Report an error in an easily parseable way.
311 bool OsLayer::ErrorReport(const char *part, const char *symptom, int count) {
312 time_t now = time(NULL);
313 int ttf = now - time_initialized_;
314 logprintf(0, "Report Error: %s : %s : %d : %ds\n", symptom, part, count, ttf);
318 // Read the number of hugepages out of the kernel interface in proc.
319 int64 OsLayer::FindHugePages() {
322 // This is a kernel interface to query the numebr of hugepages
323 // available in the system.
324 static const char *hugepages_info_file = "/proc/sys/vm/nr_hugepages";
325 int hpfile = open(hugepages_info_file, O_RDONLY);
327 ssize_t bytes_read = read(hpfile, buf, 64);
330 if (bytes_read <= 0) {
331 logprintf(12, "Log: /proc/sys/vm/nr_hugepages "
332 "read did not provide data\n");
336 if (bytes_read == 64) {
337 logprintf(0, "Process Error: /proc/sys/vm/nr_hugepages "
338 "is surprisingly large\n");
342 // Add a null termintation to be string safe.
343 buf[bytes_read] = '\0';
344 // Read the page count.
345 int64 pages = strtoull(buf, NULL, 10); // NOLINT
350 int64 OsLayer::FindFreeMemSize() {
353 if (totalmemsize_ > 0)
354 return totalmemsize_;
356 int64 pages = sysconf(_SC_PHYS_PAGES);
357 int64 avpages = sysconf(_SC_AVPHYS_PAGES);
358 int64 pagesize = sysconf(_SC_PAGESIZE);
359 int64 physsize = pages * pagesize;
360 int64 avphyssize = avpages * pagesize;
362 // Assume 2MB hugepages.
363 int64 hugepagesize = FindHugePages() * 2 * kMegabyte;
365 if ((pages == -1) || (pagesize == -1)) {
366 logprintf(0, "Process Error: sysconf could not determine memory size.\n");
370 // We want to leave enough stuff for things to run.
371 // If the user specified a minimum amount of memory to expect, require that.
372 // Otherwise, if more than 2GB is present, leave 192M + 5% for other stuff.
373 // If less than 2GB is present use 85% of what's available.
374 // These are fairly arbitrary numbers that seem to work OK.
376 // TODO(nsanders): is there a more correct way to determine target
378 if (hugepagesize > 0 && min_hugepages_bytes_ > 0) {
379 minsize = min_hugepages_bytes_;
380 } else if (physsize < 2048LL * kMegabyte) {
381 minsize = ((pages * 85) / 100) * pagesize;
383 minsize = ((pages * 95) / 100) * pagesize - (192 * kMegabyte);
386 // Use hugepage sizing if available.
387 if (hugepagesize > 0) {
388 if (hugepagesize < minsize) {
389 logprintf(0, "Procedural Error: Not enough hugepages. "
390 "%lldMB available < %lldMB required.\n",
391 hugepagesize / kMegabyte,
392 minsize / kMegabyte);
393 // Require the calculated minimum amount of memory.
396 // Require that we get all hugepages.
400 // Require the calculated minimum amount of memory.
404 logprintf(5, "Log: Total %lld MB. Free %lld MB. Hugepages %lld MB. "
405 "Targeting %lld MB (%lld%%)\n",
406 physsize / kMegabyte,
407 avphyssize / kMegabyte,
408 hugepagesize / kMegabyte,
410 size * 100 / physsize);
412 totalmemsize_ = size;
416 // Allocates all memory available.
417 int64 OsLayer::AllocateAllMem() {
418 int64 length = FindFreeMemSize();
419 bool retval = AllocateTestMem(length, 0);
426 // Allocate the target memory. This may be from malloc, hugepage pool
427 // or other platform specific sources.
428 bool OsLayer::AllocateTestMem(int64 length, uint64 paddr_base) {
429 // Try hugepages first.
432 sat_assert(length >= 0);
435 logprintf(0, "Process Error: non zero paddr_base %#llx is not supported,"
436 " ignore.\n", paddr_base);
438 // Determine optimal memory allocation path.
439 bool prefer_hugepages = false;
440 bool prefer_posix_shm = false;
441 bool prefer_dynamic_mapping = false;
443 // Are there enough hugepages?
444 int64 hugepagesize = FindHugePages() * 2 * kMegabyte;
445 // TODO(nsanders): Is there enough /dev/shm? Is there enough free memeory?
446 if ((length >= 1400LL * kMegabyte) && (address_mode_ == 32)) {
447 prefer_dynamic_mapping = true;
448 prefer_posix_shm = true;
449 logprintf(3, "Log: Prefer POSIX shared memory allocation.\n");
450 logprintf(3, "Log: You may need to run "
451 "'sudo mount -o remount,size=100\% /dev/shm.'\n");
452 } else if (hugepagesize >= length) {
453 prefer_hugepages = true;
454 logprintf(3, "Log: Prefer using hugepace allocation.\n");
456 logprintf(3, "Log: Prefer plain malloc memory allocation.\n");
459 #ifdef HAVE_SYS_SHM_H
460 // Allocate hugepage mapped memory.
461 if (prefer_hugepages) {
462 do { // Allow break statement.
466 if ((shmid = shmget(2, length,
467 SHM_HUGETLB | IPC_CREAT | SHM_R | SHM_W)) < 0) {
469 string errtxt = ErrorString(err);
470 logprintf(3, "Log: failed to allocate shared hugepage "
471 "object - err %d (%s)\n",
472 err, errtxt.c_str());
473 logprintf(3, "Log: sysctl -w vm.nr_hugepages=XXX allows hugepages.\n");
477 shmaddr = shmat(shmid, NULL, NULL);
478 if (shmaddr == reinterpret_cast<void*>(-1)) {
480 string errtxt = ErrorString(err);
481 logprintf(0, "Log: failed to attach shared "
482 "hugepage object - err %d (%s).\n",
483 err, errtxt.c_str());
484 if (shmctl(shmid, IPC_RMID, NULL) < 0) {
486 string errtxt = ErrorString(err);
487 logprintf(0, "Log: failed to remove shared "
488 "hugepage object - err %d (%s).\n",
489 err, errtxt.c_str());
493 use_hugepages_ = true;
496 logprintf(0, "Log: Using shared hugepage object 0x%x at %p.\n",
501 if ((!use_hugepages_) && prefer_posix_shm) {
504 void *shmaddr = NULL;
506 shm_object = shm_open("/stressapptest", O_CREAT | O_RDWR, S_IRWXU);
507 if (shm_object < 0) {
509 string errtxt = ErrorString(err);
510 logprintf(3, "Log: failed to allocate shared "
511 "smallpage object - err %d (%s)\n",
512 err, errtxt.c_str());
516 if (0 > ftruncate(shm_object, length)) {
518 string errtxt = ErrorString(err);
519 logprintf(3, "Log: failed to ftruncate shared "
520 "smallpage object - err %d (%s)\n",
521 err, errtxt.c_str());
525 // 32 bit linux apps can only use ~1.4G of address space.
526 // Use dynamic mapping for allocations larger than that.
527 // Currently perf hit is ~10% for this.
528 if (prefer_dynamic_mapping) {
529 dynamic_mapped_shmem_ = true;
531 // Do a full mapping here otherwise.
532 shmaddr = mmap64(NULL, length, PROT_READ | PROT_WRITE,
533 MAP_SHARED | MAP_NORESERVE | MAP_LOCKED | MAP_POPULATE,
535 if (shmaddr == reinterpret_cast<void*>(-1)) {
537 string errtxt = ErrorString(err);
538 logprintf(0, "Log: failed to map shared "
539 "smallpage object - err %d (%s).\n",
540 err, errtxt.c_str());
545 use_posix_shm_ = true;
548 char location_message[256] = "";
549 if (dynamic_mapped_shmem_) {
550 sprintf(location_message, "mapped as needed");
552 sprintf(location_message, "at %p", shmaddr);
554 logprintf(0, "Log: Using posix shared memory object 0x%x %s.\n",
555 shm_object, location_message);
557 shm_unlink("/stressapptest");
559 #endif // HAVE_SYS_SHM_H
561 if (!use_hugepages_ && !use_posix_shm_) {
562 // Use memalign to ensure that blocks are aligned enough for disk direct IO.
563 buf = static_cast<char*>(memalign(4096, length));
565 logprintf(0, "Log: Using memaligned allocation at %p.\n", buf);
567 logprintf(0, "Process Error: memalign returned 0\n");
568 if ((length >= 1499LL * kMegabyte) && (address_mode_ == 32)) {
569 logprintf(0, "Log: You are trying to allocate > 1.4G on a 32 "
570 "bit process. Please setup shared memory.\n");
576 if (buf || dynamic_mapped_shmem_) {
577 testmemsize_ = length;
582 return (buf != 0) || dynamic_mapped_shmem_;
585 // Free the test memory.
586 void OsLayer::FreeTestMem() {
588 if (use_hugepages_) {
589 #ifdef HAVE_SYS_SHM_H
591 shmctl(shmid_, IPC_RMID, NULL);
593 } else if (use_posix_shm_) {
594 if (!dynamic_mapped_shmem_) {
595 munmap(testmem_, testmemsize_);
607 // Prepare the target memory. It may requre mapping in, or this may be a noop.
608 void *OsLayer::PrepareTestMem(uint64 offset, uint64 length) {
609 sat_assert((offset + length) <= testmemsize_);
610 if (dynamic_mapped_shmem_) {
611 // TODO(nsanders): Check if we can support MAP_NONBLOCK,
612 // and evaluate performance hit from not using it.
614 void * mapping = mmap64(NULL, length, PROT_READ | PROT_WRITE,
615 MAP_SHARED | MAP_NORESERVE | MAP_LOCKED | MAP_POPULATE,
618 void * mapping = mmap(NULL, length, PROT_READ | PROT_WRITE,
619 MAP_SHARED | MAP_NORESERVE | MAP_LOCKED | MAP_POPULATE,
622 if (mapping == MAP_FAILED) {
623 string errtxt = ErrorString(errno);
624 logprintf(0, "Process Error: PrepareTestMem mmap64(%llx, %llx) failed. "
626 offset, length, errtxt.c_str());
632 return reinterpret_cast<void*>(reinterpret_cast<char*>(testmem_) + offset);
635 // Release the test memory resources, if any.
636 void OsLayer::ReleaseTestMem(void *addr, uint64 offset, uint64 length) {
637 if (dynamic_mapped_shmem_) {
638 int retval = munmap(addr, length);
640 string errtxt = ErrorString(errno);
641 logprintf(0, "Process Error: ReleaseTestMem munmap(%p, %llx) failed. "
643 addr, length, errtxt.c_str());
649 // No error polling on unknown systems.
650 int OsLayer::ErrorPoll() {
654 // Generally, poll for errors once per second.
655 void OsLayer::ErrorWait() {
660 // Open a PCI bus-dev-func as a file and return its file descriptor.
661 // Error is indicated by return value less than zero.
662 int OsLayer::PciOpen(int bus, int device, int function) {
665 snprintf(dev_file, sizeof(dev_file), "/proc/bus/pci/%02x/%02x.%x",
666 bus, device, function);
668 int fd = open(dev_file, O_RDWR);
670 logprintf(0, "Process Error: Unable to open PCI bus %d, device %d, "
671 "function %d (errno %d).\n",
672 bus, device, function, errno);
680 // Read and write functions to access PCI config.
681 uint32 OsLayer::PciRead(int fd, uint32 offset, int width) {
682 // Strict aliasing rules lawyers will cause data corruption
683 // on cast pointers in some gccs.
690 uint32 size = width / 8;
692 sat_assert((width == 32) || (width == 16) || (width == 8));
693 sat_assert(offset <= (256 - size));
695 if (lseek(fd, offset, SEEK_SET) < 0) {
696 logprintf(0, "Process Error: Can't seek %x\n", offset);
699 if (read(fd, &datacast, size) != static_cast<ssize_t>(size)) {
700 logprintf(0, "Process Error: Can't read %x\n", offset);
707 sat_assert(&(datacast.l8) == reinterpret_cast<uint8*>(&datacast));
710 sat_assert(&(datacast.l16) == reinterpret_cast<uint16*>(&datacast));
718 void OsLayer::PciWrite(int fd, uint32 offset, uint32 value, int width) {
719 // Strict aliasing rules lawyers will cause data corruption
720 // on cast pointers in some gccs.
727 uint32 size = width / 8;
729 sat_assert((width == 32) || (width == 16) || (width == 8));
730 sat_assert(offset <= (256 - size));
732 // Cram the data into the right alignment.
735 sat_assert(&(datacast.l8) == reinterpret_cast<uint8*>(&datacast));
738 sat_assert(&(datacast.l16) == reinterpret_cast<uint16*>(&datacast));
739 datacast.l16 = value;
741 datacast.l32 = value;
744 if (lseek(fd, offset, SEEK_SET) < 0) {
745 logprintf(0, "Process Error: Can't seek %x\n", offset);
748 if (write(fd, &datacast, size) != static_cast<ssize_t>(size)) {
749 logprintf(0, "Process Error: Can't write %x to %x\n", datacast.l32, offset);
759 int OsLayer::OpenMSR(uint32 core, uint32 address) {
761 snprintf(buf, sizeof(buf), "/dev/cpu/%d/msr", core);
762 int fd = open(buf, O_RDWR);
766 uint32 pos = lseek(fd, address, SEEK_SET);
767 if (pos != address) {
769 logprintf(5, "Log: can't seek to msr %x, cpu %d\n", address, core);
776 bool OsLayer::ReadMSR(uint32 core, uint32 address, uint64 *data) {
777 int fd = OpenMSR(core, address);
781 // Read from the msr.
782 bool res = (sizeof(*data) == read(fd, data, sizeof(*data)));
785 logprintf(5, "Log: Failed to read msr %x core %d\n", address, core);
792 bool OsLayer::WriteMSR(uint32 core, uint32 address, uint64 *data) {
793 int fd = OpenMSR(core, address);
798 bool res = (sizeof(*data) == write(fd, data, sizeof(*data)));
801 logprintf(5, "Log: Failed to write msr %x core %d\n", address, core);
808 // Extract bits [n+len-1, n] from a 32 bit word.
809 // so GetBitField(0x0f00, 8, 4) == 0xf.
810 uint32 OsLayer::GetBitField(uint32 val, uint32 n, uint32 len) {
811 return (val >> n) & ((1<<len) - 1);
814 // Generic CPU stress workload that would work on any CPU/Platform.
815 // Float-point array moving average calculation.
816 bool OsLayer::CpuStressWorkload() {
817 double float_arr[100];
819 unsigned int seed = 12345;
821 // Initialize array with random numbers.
822 for (int i = 0; i < 100; i++) {
824 float_arr[i] = rand_r(&seed);
825 if (rand_r(&seed) % 2)
826 float_arr[i] *= -1.0;
828 float_arr[i] = rand();
830 float_arr[i] *= -1.0;
834 // Calculate moving average.
835 for (int i = 0; i < 100000000; i++) {
837 (float_arr[i % 100] + float_arr[(i + 1) % 100] +
838 float_arr[(i + 99) % 100]) / 3;
839 sum += float_arr[i % 100];
842 // Artificial printf so the loops do not get optimized away.
844 logprintf(12, "Log: I'm Feeling Lucky!\n");
848 PCIDevices OsLayer::GetPCIDevices() {
849 PCIDevices device_list;
851 struct dirent *buf = new struct dirent();
852 struct dirent *entry;
853 dir = opendir(kSysfsPath);
855 logprintf(0, "Process Error: Cannot open %s", kSysfsPath);
856 while (readdir_r(dir, buf, &entry) == 0 && entry) {
858 unsigned int dev, func;
859 // ".", ".." or a special non-device perhaps.
860 if (entry->d_name[0] == '.')
863 device = new PCIDevice();
864 if (sscanf(entry->d_name, "%04x:%02hx:%02x.%d",
865 &device->domain, &device->bus, &dev, &func) < 4) {
866 logprintf(0, "Process Error: Couldn't parse %s", entry->d_name);
872 device->vendor_id = PCIGetValue(entry->d_name, "vendor");
873 device->device_id = PCIGetValue(entry->d_name, "device");
874 PCIGetResources(entry->d_name, device);
875 device_list.insert(device_list.end(), device);
882 int OsLayer::PCIGetValue(string name, string object) {
886 snprintf(filename, sizeof(filename), "%s/%s/%s", kSysfsPath,
887 name.c_str(), object.c_str());
888 fd = open(filename, O_RDONLY);
891 len = read(fd, buf, 256);
894 return strtol(buf, NULL, 0); // NOLINT
897 int OsLayer::PCIGetResources(string name, PCIDevice *device) {
905 snprintf(filename, sizeof(filename), "%s/%s/%s", kSysfsPath,
906 name.c_str(), "resource");
907 file = fopen(filename, "r");
909 logprintf(0, "Process Error: impossible to find resource file for %s",
913 for (i = 0; i < 6; i++) {
914 if (!fgets(buf, 256, file))
916 sscanf(buf, "%llx %llx", &start, &end); // NOLINT
919 size = end - start + 1;
920 device->base_addr[i] = start;
921 device->size[i] = size;