diff --git a/src/pci-sysfs.h b/src/pci-sysfs.h
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+++ b/src/pci-sysfs.h
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+/*
+ * Copyright (c) 2016-2018, NVIDIA CORPORATION.
+ *
+ * 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 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.
+ *
+ * This file provides utility functions on Linux for interfacing
+ * with the sysfs/PCI kernel facility.
+ */
+
+#ifndef __PCI_SYSFS_H__
+#define __PCI_SYSFS_H__
+
+#if defined(NV_LINUX)
+
+#include <linux/pci.h>
+
+#if !defined(PCI_STD_HEADER_SIZEOF)
+#define PCI_STD_HEADER_SIZEOF   64
+#endif
+#if !defined(PCI_CAP_ID_EXP)
+#define  PCI_CAP_ID_EXP         0x10    /* PCI Express */
+#endif
+#if !defined(PCI_EXP_LNKCAP)
+#define PCI_EXP_LNKCAP          12          /* Link Capabilities */
+#endif
+#if !defined(PCI_EXP_LNKCAP_DLLLARC)
+#define PCI_EXP_LNKCAP_DLLLARC  0x00100000  /* Data Link Layer Link Active Reporting Capable */
+#endif
+#if !defined(PCI_EXP_LNKCTL)
+#define PCI_EXP_LNKCTL          16      /* Link Control */
+#endif
+#if !defined(PCI_EXP_LNKCTL_LD)
+#define  PCI_EXP_LNKCTL_LD      0x0010  /* Link Disable */
+#endif
+#if !defined(PCI_EXP_LNKSTA)
+#define PCI_EXP_LNKSTA          18      /* Link Status */
+#endif
+#if !defined(PCI_EXP_LNKSTA_DLLLA)
+#define  PCI_EXP_LNKSTA_DLLLA   0x2000  /* Data Link Layer Link Active */
+#endif
+
+#define PCI_LINK_WAIT_US                 200000      /* 200 ms, must be less than 1000000 (1s) */
+#define PCI_LINK_DELAY_NS                100000000   /* 100 ms */
+#define PCI_LINK_DLLLAR_DISABLE_DELAY_NS 30000000    /* 30ms */
+
+#if (_POSIX_C_SOURCE >= 199309L)
+#define PCI_NANOSLEEP(ts, rem)  nanosleep(ts, rem)
+#elif !(_POSIX_C_SOURCE >= 200809L)
+#define PCI_NANOSLEEP(ts, rem)  usleep((ts)->tv_sec * 1000000 + ((ts)->tv_nsec + 999) / 1000)
+#else
+#define PCI_NANOSLEEP(ts, rem)  sleep((ts)->tv_sec + ((ts)->tv_nsec + 999999999) / 1000000000)
+#endif
+
+typedef struct  {
+    unsigned    domain;
+    unsigned    bus;
+    unsigned    dev;
+    unsigned    ftn;
+}   pci_info_t;
+
+int pci_rescan(uint16_t domain, uint8_t bus, uint8_t slot, uint8_t function);
+int pci_find_parent_bridge(pci_info_t *p_gpu_info, pci_info_t *p_bridge_info);
+int pci_bridge_link_set_enable(uint16_t domain, uint8_t bus, uint8_t device, uint8_t ftn, int enable);
+
+#endif /* NV_LINUX */
+
+#endif /* __PCI_SYSFS_H__ */
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