+static void
+test_proc_pagemap_readable(void)
+{
+ int fd = open("/proc/self/pagemap", O_RDONLY);
+
+ if (fd < 0) {
+ RTE_LOG(ERR, EAL,
+ "Cannot open /proc/self/pagemap: %s. "
+ "virt2phys address translation will not work\n",
+ strerror(errno));
+ return;
+ }
+
+ /* Is readable */
+ close(fd);
+ proc_pagemap_readable = 1;
+}
+
+/* Lock page in physical memory and prevent from swapping. */
+int
+rte_mem_lock_page(const void *virt)
+{
+ unsigned long virtual = (unsigned long)virt;
+ int page_size = getpagesize();
+ unsigned long aligned = (virtual & ~ (page_size - 1));
+ return mlock((void*)aligned, page_size);
+}
+
+/*
+ * Get physical address of any mapped virtual address in the current process.
+ */
+phys_addr_t
+rte_mem_virt2phy(const void *virtaddr)
+{
+ int fd;
+ uint64_t page, physaddr;
+ unsigned long virt_pfn;
+ int page_size;
+ off_t offset;
+
+ /* Cannot parse /proc/self/pagemap, no need to log errors everywhere */
+ if (!proc_pagemap_readable)
+ return RTE_BAD_PHYS_ADDR;
+
+ /* standard page size */
+ page_size = getpagesize();
+
+ fd = open("/proc/self/pagemap", O_RDONLY);
+ if (fd < 0) {
+ RTE_LOG(ERR, EAL, "%s(): cannot open /proc/self/pagemap: %s\n",
+ __func__, strerror(errno));
+ return RTE_BAD_PHYS_ADDR;
+ }
+
+ virt_pfn = (unsigned long)virtaddr / page_size;
+ offset = sizeof(uint64_t) * virt_pfn;
+ if (lseek(fd, offset, SEEK_SET) == (off_t) -1) {
+ RTE_LOG(ERR, EAL, "%s(): seek error in /proc/self/pagemap: %s\n",
+ __func__, strerror(errno));
+ close(fd);
+ return RTE_BAD_PHYS_ADDR;
+ }
+ if (read(fd, &page, sizeof(uint64_t)) < 0) {
+ RTE_LOG(ERR, EAL, "%s(): cannot read /proc/self/pagemap: %s\n",
+ __func__, strerror(errno));
+ close(fd);
+ return RTE_BAD_PHYS_ADDR;
+ }
+
+ /*
+ * the pfn (page frame number) are bits 0-54 (see
+ * pagemap.txt in linux Documentation)
+ */
+ physaddr = ((page & 0x7fffffffffffffULL) * page_size)
+ + ((unsigned long)virtaddr % page_size);
+ close(fd);
+ return physaddr;
+}
+
+/*
+ * For each hugepage in hugepg_tbl, fill the physaddr value. We find
+ * it by browsing the /proc/self/pagemap special file.
+ */
+static int
+find_physaddrs(struct hugepage_file *hugepg_tbl, struct hugepage_info *hpi)
+{
+ unsigned i;
+ phys_addr_t addr;
+
+ for (i = 0; i < hpi->num_pages[0]; i++) {
+ addr = rte_mem_virt2phy(hugepg_tbl[i].orig_va);
+ if (addr == RTE_BAD_PHYS_ADDR)
+ return -1;
+ hugepg_tbl[i].physaddr = addr;
+ }
+ return 0;
+}
+