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-rw-r--r--platform-intel.c969
1 files changed, 969 insertions, 0 deletions
diff --git a/platform-intel.c b/platform-intel.c
new file mode 100644
index 0000000..5a8729e
--- /dev/null
+++ b/platform-intel.c
@@ -0,0 +1,969 @@
+/*
+ * Intel(R) Matrix Storage Manager hardware and firmware support routines
+ *
+ * Copyright (C) 2008 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#include "mdadm.h"
+#include "platform-intel.h"
+#include "probe_roms.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <limits.h>
+
+#define NVME_SUBSYS_PATH "/sys/devices/virtual/nvme-subsystem/"
+
+static int devpath_to_ll(const char *dev_path, const char *entry,
+ unsigned long long *val);
+
+static void free_sys_dev(struct sys_dev **list)
+{
+ while (*list) {
+ struct sys_dev *next = (*list)->next;
+
+ if ((*list)->path)
+ free((*list)->path);
+ free(*list);
+ *list = next;
+ }
+}
+
+struct sys_dev *find_driver_devices(const char *bus, const char *driver)
+{
+ /* search sysfs for devices driven by 'driver' */
+ char path[PATH_MAX];
+ char link[PATH_MAX];
+ char *c, *p;
+ DIR *driver_dir;
+ struct dirent *de;
+ struct sys_dev *head = NULL;
+ struct sys_dev *list = NULL;
+ struct sys_dev *vmd = NULL;
+ enum sys_dev_type type;
+ unsigned long long dev_id;
+ unsigned long long class;
+
+ if (strcmp(driver, "isci") == 0)
+ type = SYS_DEV_SAS;
+ else if (strcmp(driver, "ahci") == 0)
+ type = SYS_DEV_SATA;
+ else if (strcmp(driver, "nvme") == 0) {
+ /* if looking for nvme devs, first look for vmd */
+ vmd = find_driver_devices("pci", "vmd");
+ type = SYS_DEV_NVME;
+ } else if (strcmp(driver, "vmd") == 0)
+ type = SYS_DEV_VMD;
+ else
+ type = SYS_DEV_UNKNOWN;
+
+ sprintf(path, "/sys/bus/%s/drivers/%s", bus, driver);
+ driver_dir = opendir(path);
+ if (!driver_dir) {
+ if (vmd)
+ free_sys_dev(&vmd);
+ return NULL;
+ }
+ for (de = readdir(driver_dir); de; de = readdir(driver_dir)) {
+ int n;
+ int skip = 0;
+
+ /* is 'de' a device? check that the 'subsystem' link exists and
+ * that its target matches 'bus'
+ */
+ sprintf(path, "/sys/bus/%s/drivers/%s/%s/subsystem",
+ bus, driver, de->d_name);
+ n = readlink(path, link, sizeof(link));
+ if (n < 0 || n >= (int)sizeof(link))
+ continue;
+ link[n] = '\0';
+ c = strrchr(link, '/');
+ if (!c)
+ continue;
+ if (strncmp(bus, c+1, strlen(bus)) != 0)
+ continue;
+
+ sprintf(path, "/sys/bus/%s/drivers/%s/%s",
+ bus, driver, de->d_name);
+
+ /* if searching for nvme - skip vmd connected one */
+ if (type == SYS_DEV_NVME) {
+ struct sys_dev *dev;
+ char *rp = realpath(path, NULL);
+ for (dev = vmd; dev; dev = dev->next) {
+ if ((strncmp(dev->path, rp, strlen(dev->path)) == 0))
+ skip = 1;
+ }
+ free(rp);
+ }
+
+ /* if it's not Intel device or mark as VMD connected - skip it. */
+ if (devpath_to_vendor(path) != 0x8086 || skip == 1)
+ continue;
+
+ if (devpath_to_ll(path, "device", &dev_id) != 0)
+ continue;
+
+ if (devpath_to_ll(path, "class", &class) != 0)
+ continue;
+
+ /*
+ * Each VMD device (domain) adds separate PCI bus, it is better
+ * to store path as a path to that bus (easier further
+ * determination which NVMe dev is connected to this particular
+ * VMD domain).
+ */
+ if (type == SYS_DEV_VMD) {
+ sprintf(path, "/sys/bus/%s/drivers/%s/%s/domain/device",
+ bus, driver, de->d_name);
+ }
+ p = realpath(path, NULL);
+ if (p == NULL) {
+ pr_err("Unable to get real path for '%s'\n", path);
+ continue;
+ }
+
+ /* start / add list entry */
+ if (!head) {
+ head = xmalloc(sizeof(*head));
+ list = head;
+ } else {
+ list->next = xmalloc(sizeof(*head));
+ list = list->next;
+ }
+
+ if (!list) {
+ free_sys_dev(&head);
+ break;
+ }
+
+ list->dev_id = (__u16) dev_id;
+ list->class = (__u32) class;
+ list->type = type;
+ list->next = NULL;
+ list->path = p;
+
+ if ((list->pci_id = strrchr(list->path, '/')) != NULL)
+ list->pci_id++;
+ }
+ closedir(driver_dir);
+
+ if (vmd) {
+ if (list)
+ list->next = vmd;
+ else
+ head = vmd;
+ }
+
+ return head;
+}
+
+static struct sys_dev *intel_devices=NULL;
+static time_t valid_time = 0;
+
+struct sys_dev *device_by_id(__u16 device_id)
+{
+ struct sys_dev *iter;
+
+ for (iter = intel_devices; iter != NULL; iter = iter->next)
+ if (iter->dev_id == device_id)
+ return iter;
+ return NULL;
+}
+
+struct sys_dev *device_by_id_and_path(__u16 device_id, const char *path)
+{
+ struct sys_dev *iter;
+
+ for (iter = intel_devices; iter != NULL; iter = iter->next)
+ if ((iter->dev_id == device_id) && strstr(iter->path, path))
+ return iter;
+ return NULL;
+}
+
+static int devpath_to_ll(const char *dev_path, const char *entry, unsigned long long *val)
+{
+ char path[strlen(dev_path) + strlen(entry) + 2];
+ int fd;
+ int n;
+
+ sprintf(path, "%s/%s", dev_path, entry);
+
+ fd = open(path, O_RDONLY);
+ if (fd < 0)
+ return -1;
+ n = sysfs_fd_get_ll(fd, val);
+ close(fd);
+ return n;
+}
+
+__u16 devpath_to_vendor(const char *dev_path)
+{
+ char path[strlen(dev_path) + strlen("/vendor") + 1];
+ char vendor[7];
+ int fd;
+ __u16 id = 0xffff;
+ int n;
+
+ sprintf(path, "%s/vendor", dev_path);
+
+ fd = open(path, O_RDONLY);
+ if (fd < 0)
+ return 0xffff;
+
+ n = read(fd, vendor, sizeof(vendor));
+ if (n == sizeof(vendor)) {
+ vendor[n - 1] = '\0';
+ id = strtoul(vendor, NULL, 16);
+ }
+ close(fd);
+
+ return id;
+}
+
+/* Description: Read text value of dev_path/entry field
+ * Parameters:
+ * dev_path - sysfs path to the device
+ * entry - entry to be read
+ * buf - buffer for read value
+ * len - size of buf
+ * verbose - error logging level
+ */
+int devpath_to_char(const char *dev_path, const char *entry, char *buf, int len,
+ int verbose)
+{
+ char path[PATH_MAX];
+
+ snprintf(path, sizeof(path), "%s/%s", dev_path, entry);
+ if (load_sys(path, buf, len)) {
+ if (verbose)
+ pr_err("Cannot read %s, aborting\n", path);
+ return 1;
+ }
+
+ return 0;
+}
+
+struct sys_dev *find_intel_devices(void)
+{
+ struct sys_dev *ahci, *isci, *nvme;
+
+ if (valid_time > time(0) - 10)
+ return intel_devices;
+
+ if (intel_devices)
+ free_sys_dev(&intel_devices);
+
+ isci = find_driver_devices("pci", "isci");
+ ahci = find_driver_devices("pci", "ahci");
+ /* Searching for NVMe will return list of NVMe and VMD controllers */
+ nvme = find_driver_devices("pci", "nvme");
+
+ if (!isci && !ahci) {
+ ahci = nvme;
+ } else if (!ahci) {
+ ahci = isci;
+ struct sys_dev *elem = ahci;
+ while (elem->next)
+ elem = elem->next;
+ elem->next = nvme;
+ } else {
+ struct sys_dev *elem = ahci;
+ while (elem->next)
+ elem = elem->next;
+ elem->next = isci;
+ while (elem->next)
+ elem = elem->next;
+ elem->next = nvme;
+ }
+ intel_devices = ahci;
+ valid_time = time(0);
+ return intel_devices;
+}
+
+/*
+ * PCI Expansion ROM Data Structure Format */
+struct pciExpDataStructFormat {
+ __u8 ver[4];
+ __u16 vendorID;
+ __u16 deviceID;
+ __u16 devListOffset;
+ __u16 pciDataStructLen;
+ __u8 pciDataStructRev;
+} __attribute__ ((packed));
+
+struct orom_entry *orom_entries;
+
+const struct orom_entry *get_orom_entry_by_device_id(__u16 dev_id)
+{
+ struct orom_entry *entry;
+ struct devid_list *devid;
+
+ for (entry = orom_entries; entry; entry = entry->next) {
+ for (devid = entry->devid_list; devid; devid = devid->next) {
+ if (devid->devid == dev_id)
+ return entry;
+ }
+ }
+
+ return NULL;
+}
+
+const struct imsm_orom *get_orom_by_device_id(__u16 dev_id)
+{
+ const struct orom_entry *entry = get_orom_entry_by_device_id(dev_id);
+
+ if (entry)
+ return &entry->orom;
+
+ return NULL;
+}
+
+static struct orom_entry *add_orom(const struct imsm_orom *orom)
+{
+ struct orom_entry *list;
+ struct orom_entry *prev = NULL;
+
+ for (list = orom_entries; list; prev = list, list = list->next)
+ ;
+
+ list = xmalloc(sizeof(struct orom_entry));
+ list->orom = *orom;
+ list->devid_list = NULL;
+ list->next = NULL;
+
+ if (prev == NULL)
+ orom_entries = list;
+ else
+ prev->next = list;
+
+ return list;
+}
+
+static void add_orom_device_id(struct orom_entry *entry, __u16 dev_id)
+{
+ struct devid_list *list;
+ struct devid_list *prev = NULL;
+
+ for (list = entry->devid_list; list; prev = list, list = list->next) {
+ if (list->devid == dev_id)
+ return;
+ }
+ list = xmalloc(sizeof(struct devid_list));
+ list->devid = dev_id;
+ list->next = NULL;
+
+ if (prev == NULL)
+ entry->devid_list = list;
+ else
+ prev->next = list;
+}
+
+static int scan(const void *start, const void *end, const void *data)
+{
+ int offset;
+ const struct imsm_orom *imsm_mem = NULL;
+ int len = (end - start);
+ struct pciExpDataStructFormat *ptr= (struct pciExpDataStructFormat *)data;
+
+ if (data + 0x18 > end) {
+ dprintf("cannot find pciExpDataStruct \n");
+ return 0;
+ }
+
+ dprintf("ptr->vendorID: %lx __le16_to_cpu(ptr->deviceID): %lx \n",
+ (ulong) __le16_to_cpu(ptr->vendorID),
+ (ulong) __le16_to_cpu(ptr->deviceID));
+
+ if (__le16_to_cpu(ptr->vendorID) != 0x8086)
+ return 0;
+
+ if (get_orom_by_device_id(ptr->deviceID))
+ return 0;
+
+ for (offset = 0; offset < len; offset += 4) {
+ const void *mem = start + offset;
+
+ if ((memcmp(mem, IMSM_OROM_SIGNATURE, 4) == 0)) {
+ imsm_mem = mem;
+ break;
+ }
+ }
+
+ if (!imsm_mem)
+ return 0;
+
+ struct orom_entry *orom = add_orom(imsm_mem);
+
+ /* only PciDataStructure with revision 3 and above supports devices list. */
+ if (ptr->pciDataStructRev >= 3 && ptr->devListOffset) {
+ const __u16 *dev_list = (void *)ptr + ptr->devListOffset;
+ int i;
+
+ for (i = 0; dev_list[i] != 0; i++)
+ add_orom_device_id(orom, dev_list[i]);
+ } else {
+ add_orom_device_id(orom, __le16_to_cpu(ptr->deviceID));
+ }
+
+ return 0;
+}
+
+const struct imsm_orom *imsm_platform_test(struct sys_dev *hba)
+{
+ struct imsm_orom orom = {
+ .signature = IMSM_OROM_SIGNATURE,
+ .rlc = IMSM_OROM_RLC_RAID0 | IMSM_OROM_RLC_RAID1 |
+ IMSM_OROM_RLC_RAID10 | IMSM_OROM_RLC_RAID5,
+ .sss = IMSM_OROM_SSS_4kB | IMSM_OROM_SSS_8kB |
+ IMSM_OROM_SSS_16kB | IMSM_OROM_SSS_32kB |
+ IMSM_OROM_SSS_64kB | IMSM_OROM_SSS_128kB |
+ IMSM_OROM_SSS_256kB | IMSM_OROM_SSS_512kB |
+ IMSM_OROM_SSS_1MB | IMSM_OROM_SSS_2MB,
+ .dpa = IMSM_OROM_DISKS_PER_ARRAY,
+ .tds = IMSM_OROM_TOTAL_DISKS,
+ .vpa = IMSM_OROM_VOLUMES_PER_ARRAY,
+ .vphba = IMSM_OROM_VOLUMES_PER_HBA
+ };
+ orom.attr = orom.rlc | IMSM_OROM_ATTR_ChecksumVerify;
+
+ if (check_env("IMSM_TEST_OROM_NORAID5")) {
+ orom.rlc = IMSM_OROM_RLC_RAID0 | IMSM_OROM_RLC_RAID1 |
+ IMSM_OROM_RLC_RAID10;
+ }
+ if (check_env("IMSM_TEST_AHCI_EFI_NORAID5") && (hba->type == SYS_DEV_SAS)) {
+ orom.rlc = IMSM_OROM_RLC_RAID0 | IMSM_OROM_RLC_RAID1 |
+ IMSM_OROM_RLC_RAID10;
+ }
+ if (check_env("IMSM_TEST_SCU_EFI_NORAID5") && (hba->type == SYS_DEV_SATA)) {
+ orom.rlc = IMSM_OROM_RLC_RAID0 | IMSM_OROM_RLC_RAID1 |
+ IMSM_OROM_RLC_RAID10;
+ }
+
+ struct orom_entry *ret = add_orom(&orom);
+
+ add_orom_device_id(ret, hba->dev_id);
+
+ return &ret->orom;
+}
+
+static const struct imsm_orom *find_imsm_hba_orom(struct sys_dev *hba)
+{
+ unsigned long align;
+
+ if (check_env("IMSM_TEST_OROM"))
+ return imsm_platform_test(hba);
+
+ /* return empty OROM capabilities in EFI test mode */
+ if (check_env("IMSM_TEST_AHCI_EFI") || check_env("IMSM_TEST_SCU_EFI"))
+ return NULL;
+
+ find_intel_devices();
+
+ if (intel_devices == NULL)
+ return NULL;
+
+ /* scan option-rom memory looking for an imsm signature */
+ if (check_env("IMSM_SAFE_OROM_SCAN"))
+ align = 2048;
+ else
+ align = 512;
+ if (probe_roms_init(align) != 0)
+ return NULL;
+ probe_roms();
+ /* ignore return value - True is returned if both adapater roms are found */
+ scan_adapter_roms(scan);
+ probe_roms_exit();
+
+ return get_orom_by_device_id(hba->dev_id);
+}
+
+#define GUID_STR_MAX 37 /* according to GUID format:
+ * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" */
+
+#define EFI_GUID(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7) \
+((struct efi_guid) \
+{{ (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, ((a) >> 24) & 0xff, \
+ (b) & 0xff, ((b) >> 8) & 0xff, \
+ (c) & 0xff, ((c) >> 8) & 0xff, \
+ (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }})
+
+#define SYS_EFI_VAR_PATH "/sys/firmware/efi/vars"
+#define SYS_EFIVARS_PATH "/sys/firmware/efi/efivars"
+#define SCU_PROP "RstScuV"
+#define AHCI_PROP "RstSataV"
+#define AHCI_SSATA_PROP "RstsSatV"
+#define AHCI_TSATA_PROP "RsttSatV"
+#define VMD_PROP "RstUefiV"
+
+#define VENDOR_GUID \
+ EFI_GUID(0x193dfefa, 0xa445, 0x4302, 0x99, 0xd8, 0xef, 0x3a, 0xad, 0x1a, 0x04, 0xc6)
+
+#define PCI_CLASS_RAID_CNTRL 0x010400
+
+static int read_efi_var(void *buffer, ssize_t buf_size,
+ const char *variable_name, struct efi_guid guid)
+{
+ char path[PATH_MAX];
+ char buf[GUID_STR_MAX];
+ int fd;
+ ssize_t n;
+
+ snprintf(path, PATH_MAX, "%s/%s-%s", SYS_EFIVARS_PATH, variable_name, guid_str(buf, guid));
+
+ fd = open(path, O_RDONLY);
+ if (fd < 0)
+ return 1;
+
+ /* read the variable attributes and ignore it */
+ n = read(fd, buf, sizeof(__u32));
+ if (n < 0) {
+ close(fd);
+ return 1;
+ }
+
+ /* read the variable data */
+ n = read(fd, buffer, buf_size);
+ close(fd);
+ if (n < buf_size)
+ return 1;
+
+ return 0;
+}
+
+static int read_efi_variable(void *buffer, ssize_t buf_size,
+ const char *variable_name, struct efi_guid guid)
+{
+ char path[PATH_MAX];
+ char buf[GUID_STR_MAX];
+ int dfd;
+ ssize_t n, var_data_len;
+
+ /* Try to read the variable using the new efivarfs interface first.
+ * If that fails, fall back to the old sysfs-efivars interface. */
+ if (!read_efi_var(buffer, buf_size, variable_name, guid))
+ return 0;
+
+ snprintf(path, PATH_MAX, "%s/%s-%s/size", SYS_EFI_VAR_PATH, variable_name, guid_str(buf, guid));
+
+ dprintf("EFI VAR: path=%s\n", path);
+ /* get size of variable data */
+ dfd = open(path, O_RDONLY);
+ if (dfd < 0)
+ return 1;
+
+ n = read(dfd, &buf, sizeof(buf));
+ close(dfd);
+ if (n < 0)
+ return 1;
+ buf[n] = '\0';
+
+ errno = 0;
+ var_data_len = strtoul(buf, NULL, 16);
+ if ((errno == ERANGE && (var_data_len == LONG_MAX)) ||
+ (errno != 0 && var_data_len == 0))
+ return 1;
+
+ /* get data */
+ snprintf(path, PATH_MAX, "%s/%s-%s/data", SYS_EFI_VAR_PATH, variable_name, guid_str(buf, guid));
+
+ dprintf("EFI VAR: path=%s\n", path);
+ dfd = open(path, O_RDONLY);
+ if (dfd < 0)
+ return 1;
+
+ n = read(dfd, buffer, buf_size);
+ close(dfd);
+ if (n != var_data_len || n < buf_size) {
+ return 1;
+ }
+
+ return 0;
+}
+
+const struct imsm_orom *find_imsm_efi(struct sys_dev *hba)
+{
+ struct imsm_orom orom;
+ struct orom_entry *ret;
+ static const char * const sata_efivars[] = {AHCI_PROP, AHCI_SSATA_PROP,
+ AHCI_TSATA_PROP};
+ unsigned long i;
+
+ if (check_env("IMSM_TEST_AHCI_EFI") || check_env("IMSM_TEST_SCU_EFI"))
+ return imsm_platform_test(hba);
+
+ /* OROM test is set, return that there is no EFI capabilities */
+ if (check_env("IMSM_TEST_OROM"))
+ return NULL;
+
+ switch (hba->type) {
+ case SYS_DEV_SAS:
+ if (!read_efi_variable(&orom, sizeof(orom), SCU_PROP,
+ VENDOR_GUID))
+ break;
+
+ return NULL;
+ case SYS_DEV_SATA:
+ if (hba->class != PCI_CLASS_RAID_CNTRL)
+ return NULL;
+
+ for (i = 0; i < ARRAY_SIZE(sata_efivars); i++) {
+ if (!read_efi_variable(&orom, sizeof(orom),
+ sata_efivars[i], VENDOR_GUID))
+ break;
+
+ }
+ if (i == ARRAY_SIZE(sata_efivars))
+ return NULL;
+
+ break;
+ case SYS_DEV_VMD:
+ if (!read_efi_variable(&orom, sizeof(orom), VMD_PROP,
+ VENDOR_GUID))
+ break;
+ return NULL;
+ default:
+ return NULL;
+ }
+
+ ret = add_orom(&orom);
+ add_orom_device_id(ret, hba->dev_id);
+ ret->type = hba->type;
+
+ return &ret->orom;
+}
+
+const struct imsm_orom *find_imsm_nvme(struct sys_dev *hba)
+{
+ static struct orom_entry *nvme_orom;
+
+ if (hba->type != SYS_DEV_NVME)
+ return NULL;
+
+ if (!nvme_orom) {
+ struct imsm_orom nvme_orom_compat = {
+ .signature = IMSM_NVME_OROM_COMPAT_SIGNATURE,
+ .rlc = IMSM_OROM_RLC_RAID0 | IMSM_OROM_RLC_RAID1 |
+ IMSM_OROM_RLC_RAID10 | IMSM_OROM_RLC_RAID5,
+ .sss = IMSM_OROM_SSS_4kB | IMSM_OROM_SSS_8kB |
+ IMSM_OROM_SSS_16kB | IMSM_OROM_SSS_32kB |
+ IMSM_OROM_SSS_64kB | IMSM_OROM_SSS_128kB,
+ .dpa = IMSM_OROM_DISKS_PER_ARRAY_NVME,
+ .tds = IMSM_OROM_TOTAL_DISKS_NVME,
+ .vpa = IMSM_OROM_VOLUMES_PER_ARRAY,
+ .vphba = IMSM_OROM_TOTAL_DISKS_NVME / 2 * IMSM_OROM_VOLUMES_PER_ARRAY,
+ .attr = IMSM_OROM_ATTR_2TB | IMSM_OROM_ATTR_2TB_DISK,
+ .driver_features = IMSM_OROM_CAPABILITIES_EnterpriseSystem
+ };
+ nvme_orom = add_orom(&nvme_orom_compat);
+ }
+ add_orom_device_id(nvme_orom, hba->dev_id);
+ nvme_orom->type = SYS_DEV_NVME;
+ return &nvme_orom->orom;
+}
+
+const struct imsm_orom *find_imsm_capability(struct sys_dev *hba)
+{
+ const struct imsm_orom *cap = get_orom_by_device_id(hba->dev_id);
+
+ if (cap)
+ return cap;
+
+ if (hba->type == SYS_DEV_NVME)
+ return find_imsm_nvme(hba);
+ if ((cap = find_imsm_efi(hba)) != NULL)
+ return cap;
+ if ((cap = find_imsm_hba_orom(hba)) != NULL)
+ return cap;
+
+ return NULL;
+}
+
+/* Check whether the nvme device is represented by nvme subsytem,
+ * if yes virtual path should be changed to hardware device path,
+ * to allow IMSM capabilities detection.
+ * Returns:
+ * hardware path to device - if the device is represented via
+ * nvme virtual subsytem
+ * NULL - if the device is not represented via nvme virtual subsytem
+ */
+char *get_nvme_multipath_dev_hw_path(const char *dev_path)
+{
+ DIR *dir;
+ struct dirent *ent;
+ char *rp = NULL;
+
+ if (strncmp(dev_path, NVME_SUBSYS_PATH, strlen(NVME_SUBSYS_PATH)) != 0)
+ return NULL;
+
+ dir = opendir(dev_path);
+ if (!dir)
+ return NULL;
+
+ for (ent = readdir(dir); ent; ent = readdir(dir)) {
+ char buf[strlen(dev_path) + strlen(ent->d_name) + 1];
+
+ /* Check if dir is a controller, ignore namespaces*/
+ if (!(strncmp(ent->d_name, "nvme", 4) == 0) ||
+ (strrchr(ent->d_name, 'n') != &ent->d_name[0]))
+ continue;
+
+ sprintf(buf, "%s/%s", dev_path, ent->d_name);
+ rp = realpath(buf, NULL);
+ break;
+ }
+
+ closedir(dir);
+ return rp;
+}
+
+/* Description: Return part or whole realpath for the dev
+ * Parameters:
+ * dev - the device to be quered
+ * dev_level - level of "/device" entries. It allows to caller to access
+ * virtual or physical devices which are on "path" to quered
+ * one.
+ * buf - optional, must be PATH_MAX size. If set, then will be used.
+ */
+char *devt_to_devpath(dev_t dev, int dev_level, char *buf)
+{
+ char device[PATH_MAX];
+ char *hw_path;
+ int i;
+ unsigned long device_free_len = sizeof(device) - 1;
+ char dev_str[] = "/device";
+ unsigned long dev_str_len = strlen(dev_str);
+
+ snprintf(device, sizeof(device), "/sys/dev/block/%d:%d", major(dev),
+ minor(dev));
+
+ /* If caller wants block device, return path to it even if it is exposed
+ * via virtual layer.
+ */
+ if (dev_level == 0)
+ return realpath(device, buf);
+
+ device_free_len -= strlen(device);
+ for (i = 0; i < dev_level; i++) {
+ if (device_free_len < dev_str_len)
+ return NULL;
+
+ strncat(device, dev_str, device_free_len);
+
+ /* Resolve nvme-subsystem abstraction if needed
+ */
+ device_free_len -= dev_str_len;
+ if (i == 0) {
+ char rp[PATH_MAX];
+
+ if (!realpath(device, rp))
+ return NULL;
+ hw_path = get_nvme_multipath_dev_hw_path(rp);
+ if (hw_path) {
+ strcpy(device, hw_path);
+ device_free_len = sizeof(device) -
+ strlen(device) - 1;
+ free(hw_path);
+ }
+ }
+ }
+
+ return realpath(device, buf);
+}
+
+char *diskfd_to_devpath(int fd, int dev_level, char *buf)
+{
+ /* return the device path for a disk, return NULL on error or fd
+ * refers to a partition
+ */
+ struct stat st;
+
+ if (fstat(fd, &st) != 0)
+ return NULL;
+ if (!S_ISBLK(st.st_mode))
+ return NULL;
+
+ return devt_to_devpath(st.st_rdev, dev_level, buf);
+}
+
+int path_attached_to_hba(const char *disk_path, const char *hba_path)
+{
+ int rc;
+
+ if (check_env("IMSM_TEST_AHCI_DEV") ||
+ check_env("IMSM_TEST_SCU_DEV")) {
+ return 1;
+ }
+
+ if (!disk_path || !hba_path)
+ return 0;
+ dprintf("hba: %s - disk: %s\n", hba_path, disk_path);
+ if (strncmp(disk_path, hba_path, strlen(hba_path)) == 0)
+ rc = 1;
+ else
+ rc = 0;
+
+ return rc;
+}
+
+int devt_attached_to_hba(dev_t dev, const char *hba_path)
+{
+ char *disk_path = devt_to_devpath(dev, 1, NULL);
+ int rc = path_attached_to_hba(disk_path, hba_path);
+
+ if (disk_path)
+ free(disk_path);
+
+ return rc;
+}
+
+int disk_attached_to_hba(int fd, const char *hba_path)
+{
+ char *disk_path = diskfd_to_devpath(fd, 1, NULL);
+ int rc = path_attached_to_hba(disk_path, hba_path);
+
+ if (disk_path)
+ free(disk_path);
+
+ return rc;
+}
+
+char *vmd_domain_to_controller(struct sys_dev *hba, char *buf)
+{
+ struct dirent *ent;
+ DIR *dir;
+ char path[PATH_MAX];
+
+ if (!hba)
+ return NULL;
+
+ if (hba->type != SYS_DEV_VMD)
+ return NULL;
+
+ dir = opendir("/sys/bus/pci/drivers/vmd");
+ if (!dir)
+ return NULL;
+
+ for (ent = readdir(dir); ent; ent = readdir(dir)) {
+ sprintf(path, "/sys/bus/pci/drivers/vmd/%s/domain/device",
+ ent->d_name);
+
+ if (!realpath(path, buf))
+ continue;
+
+ if (strncmp(buf, hba->path, strlen(buf)) == 0) {
+ sprintf(path, "/sys/bus/pci/drivers/vmd/%s", ent->d_name);
+ closedir(dir);
+ return realpath(path, buf);
+ }
+ }
+
+ closedir(dir);
+ return NULL;
+}
+
+/* Scan over all controller's namespaces and compare nsid value to verify if
+ * current one is supported. The routine doesn't check IMSM capabilities for
+ * namespace. Only one nvme namespace is supported by IMSM.
+ * Paramteres:
+ * fd - open descriptor to the nvme namespace
+ * verbose - error logging level
+ * Returns:
+ * 1 - if namespace is supported
+ * 0 - otherwise
+ */
+int imsm_is_nvme_namespace_supported(int fd, int verbose)
+{
+ DIR *dir = NULL;
+ struct dirent *ent;
+ char cntrl_path[PATH_MAX];
+ char ns_path[PATH_MAX];
+ unsigned long long lowest_nsid = ULLONG_MAX;
+ unsigned long long this_nsid;
+ int rv = 0;
+
+
+ if (!diskfd_to_devpath(fd, 1, cntrl_path) ||
+ !diskfd_to_devpath(fd, 0, ns_path)) {
+ if (verbose)
+ pr_err("Cannot get device paths\n");
+ goto abort;
+ }
+
+
+ if (devpath_to_ll(ns_path, "nsid", &this_nsid)) {
+ if (verbose)
+ pr_err("Cannot read nsid value for %s",
+ basename(ns_path));
+ goto abort;
+ }
+
+ dir = opendir(cntrl_path);
+ if (!dir)
+ goto abort;
+
+ /* The lowest nvme namespace is supported */
+ for (ent = readdir(dir); ent; ent = readdir(dir)) {
+ unsigned long long curr_nsid;
+ char curr_ns_path[PATH_MAX + 256];
+
+ if (!strstr(ent->d_name, "nvme"))
+ continue;
+
+ snprintf(curr_ns_path, sizeof(curr_ns_path), "%s/%s",
+ cntrl_path, ent->d_name);
+
+ if (devpath_to_ll(curr_ns_path, "nsid", &curr_nsid))
+ goto abort;
+
+ if (lowest_nsid > curr_nsid)
+ lowest_nsid = curr_nsid;
+ }
+
+ if (this_nsid == lowest_nsid)
+ rv = 1;
+ else if (verbose)
+ pr_err("IMSM is supported on the lowest NVMe namespace\n");
+
+abort:
+ if (dir)
+ closedir(dir);
+
+ return rv;
+}
+
+/* Verify if multipath is supported by NVMe controller
+ * Returns:
+ * 0 - not supported
+ * 1 - supported
+ */
+int is_multipath_nvme(int disk_fd)
+{
+ char ns_path[PATH_MAX];
+
+ if (!diskfd_to_devpath(disk_fd, 0, ns_path))
+ return 0;
+
+ if (strncmp(ns_path, NVME_SUBSYS_PATH, strlen(NVME_SUBSYS_PATH)) == 0)
+ return 1;
+
+ return 0;
+}