2 * Intel(R) Matrix Storage Manager hardware and firmware support routines
4 * Copyright (C) 2008 Intel Corporation
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
20 #include "platform-intel.h"
21 #include "probe_roms.h"
29 #include <sys/types.h>
33 #define NVME_SUBSYS_PATH "/sys/devices/virtual/nvme-subsystem/"
35 static int devpath_to_ll(const char *dev_path
, const char *entry
,
36 unsigned long long *val
);
38 static void free_sys_dev(struct sys_dev
**list
)
41 struct sys_dev
*next
= (*list
)->next
;
50 struct sys_dev
*find_driver_devices(const char *bus
, const char *driver
)
52 /* search sysfs for devices driven by 'driver' */
58 struct sys_dev
*head
= NULL
;
59 struct sys_dev
*list
= NULL
;
60 struct sys_dev
*vmd
= NULL
;
61 enum sys_dev_type type
;
62 unsigned long long dev_id
;
63 unsigned long long class;
65 if (strcmp(driver
, "isci") == 0)
67 else if (strcmp(driver
, "ahci") == 0)
69 else if (strcmp(driver
, "nvme") == 0) {
70 /* if looking for nvme devs, first look for vmd */
71 vmd
= find_driver_devices("pci", "vmd");
73 } else if (strcmp(driver
, "vmd") == 0)
76 type
= SYS_DEV_UNKNOWN
;
78 sprintf(path
, "/sys/bus/%s/drivers/%s", bus
, driver
);
79 driver_dir
= opendir(path
);
85 for (de
= readdir(driver_dir
); de
; de
= readdir(driver_dir
)) {
89 /* is 'de' a device? check that the 'subsystem' link exists and
90 * that its target matches 'bus'
92 sprintf(path
, "/sys/bus/%s/drivers/%s/%s/subsystem",
93 bus
, driver
, de
->d_name
);
94 n
= readlink(path
, link
, sizeof(link
));
95 if (n
< 0 || n
>= (int)sizeof(link
))
98 c
= strrchr(link
, '/');
101 if (strncmp(bus
, c
+1, strlen(bus
)) != 0)
104 sprintf(path
, "/sys/bus/%s/drivers/%s/%s",
105 bus
, driver
, de
->d_name
);
107 /* if searching for nvme - skip vmd connected one */
108 if (type
== SYS_DEV_NVME
) {
110 char *rp
= realpath(path
, NULL
);
111 for (dev
= vmd
; dev
; dev
= dev
->next
) {
112 if ((strncmp(dev
->path
, rp
, strlen(dev
->path
)) == 0))
118 /* if it's not Intel device or mark as VMD connected - skip it. */
119 if (devpath_to_vendor(path
) != 0x8086 || skip
== 1)
122 if (devpath_to_ll(path
, "device", &dev_id
) != 0)
125 if (devpath_to_ll(path
, "class", &class) != 0)
129 * Each VMD device (domain) adds separate PCI bus, it is better
130 * to store path as a path to that bus (easier further
131 * determination which NVMe dev is connected to this particular
134 if (type
== SYS_DEV_VMD
) {
135 sprintf(path
, "/sys/bus/%s/drivers/%s/%s/domain/device",
136 bus
, driver
, de
->d_name
);
138 p
= realpath(path
, NULL
);
140 pr_err("Unable to get real path for '%s'\n", path
);
144 /* start / add list entry */
146 head
= xmalloc(sizeof(*head
));
149 list
->next
= xmalloc(sizeof(*head
));
158 list
->dev_id
= (__u16
) dev_id
;
159 list
->class = (__u32
) class;
164 if ((list
->pci_id
= strrchr(list
->path
, '/')) != NULL
)
167 closedir(driver_dir
);
179 static struct sys_dev
*intel_devices
=NULL
;
180 static time_t valid_time
= 0;
182 struct sys_dev
*device_by_id(__u16 device_id
)
184 struct sys_dev
*iter
;
186 for (iter
= intel_devices
; iter
!= NULL
; iter
= iter
->next
)
187 if (iter
->dev_id
== device_id
)
192 struct sys_dev
*device_by_id_and_path(__u16 device_id
, const char *path
)
194 struct sys_dev
*iter
;
196 for (iter
= intel_devices
; iter
!= NULL
; iter
= iter
->next
)
197 if ((iter
->dev_id
== device_id
) && strstr(iter
->path
, path
))
202 static int devpath_to_ll(const char *dev_path
, const char *entry
, unsigned long long *val
)
204 char path
[strlen(dev_path
) + strlen(entry
) + 2];
208 sprintf(path
, "%s/%s", dev_path
, entry
);
210 fd
= open(path
, O_RDONLY
);
213 n
= sysfs_fd_get_ll(fd
, val
);
218 __u16
devpath_to_vendor(const char *dev_path
)
220 char path
[strlen(dev_path
) + strlen("/vendor") + 1];
226 sprintf(path
, "%s/vendor", dev_path
);
228 fd
= open(path
, O_RDONLY
);
232 n
= read(fd
, vendor
, sizeof(vendor
));
233 if (n
== sizeof(vendor
)) {
234 vendor
[n
- 1] = '\0';
235 id
= strtoul(vendor
, NULL
, 16);
242 /* Description: Read text value of dev_path/entry field
244 * dev_path - sysfs path to the device
245 * entry - entry to be read
246 * buf - buffer for read value
248 * verbose - error logging level
250 int devpath_to_char(const char *dev_path
, const char *entry
, char *buf
, int len
,
255 snprintf(path
, sizeof(path
), "%s/%s", dev_path
, entry
);
256 if (load_sys(path
, buf
, len
)) {
258 pr_err("Cannot read %s, aborting\n", path
);
265 struct sys_dev
*find_intel_devices(void)
267 struct sys_dev
*ahci
, *isci
, *nvme
;
269 if (valid_time
> time(0) - 10)
270 return intel_devices
;
273 free_sys_dev(&intel_devices
);
275 isci
= find_driver_devices("pci", "isci");
276 ahci
= find_driver_devices("pci", "ahci");
277 /* Searching for NVMe will return list of NVMe and VMD controllers */
278 nvme
= find_driver_devices("pci", "nvme");
280 if (!isci
&& !ahci
) {
284 struct sys_dev
*elem
= ahci
;
289 struct sys_dev
*elem
= ahci
;
297 intel_devices
= ahci
;
298 valid_time
= time(0);
299 return intel_devices
;
303 * PCI Expansion ROM Data Structure Format */
304 struct pciExpDataStructFormat
{
309 __u16 pciDataStructLen
;
310 __u8 pciDataStructRev
;
311 } __attribute__ ((packed
));
313 struct orom_entry
*orom_entries
;
315 const struct orom_entry
*get_orom_entry_by_device_id(__u16 dev_id
)
317 struct orom_entry
*entry
;
318 struct devid_list
*devid
;
320 for (entry
= orom_entries
; entry
; entry
= entry
->next
) {
321 for (devid
= entry
->devid_list
; devid
; devid
= devid
->next
) {
322 if (devid
->devid
== dev_id
)
330 const struct imsm_orom
*get_orom_by_device_id(__u16 dev_id
)
332 const struct orom_entry
*entry
= get_orom_entry_by_device_id(dev_id
);
340 static struct orom_entry
*add_orom(const struct imsm_orom
*orom
)
342 struct orom_entry
*list
;
343 struct orom_entry
*prev
= NULL
;
345 for (list
= orom_entries
; list
; prev
= list
, list
= list
->next
)
348 list
= xmalloc(sizeof(struct orom_entry
));
350 list
->devid_list
= NULL
;
361 static void add_orom_device_id(struct orom_entry
*entry
, __u16 dev_id
)
363 struct devid_list
*list
;
364 struct devid_list
*prev
= NULL
;
366 for (list
= entry
->devid_list
; list
; prev
= list
, list
= list
->next
) {
367 if (list
->devid
== dev_id
)
370 list
= xmalloc(sizeof(struct devid_list
));
371 list
->devid
= dev_id
;
375 entry
->devid_list
= list
;
380 static int scan(const void *start
, const void *end
, const void *data
)
383 const struct imsm_orom
*imsm_mem
= NULL
;
384 int len
= (end
- start
);
385 struct pciExpDataStructFormat
*ptr
= (struct pciExpDataStructFormat
*)data
;
387 if (data
+ 0x18 > end
) {
388 dprintf("cannot find pciExpDataStruct \n");
392 dprintf("ptr->vendorID: %lx __le16_to_cpu(ptr->deviceID): %lx \n",
393 (ulong
) __le16_to_cpu(ptr
->vendorID
),
394 (ulong
) __le16_to_cpu(ptr
->deviceID
));
396 if (__le16_to_cpu(ptr
->vendorID
) != 0x8086)
399 if (get_orom_by_device_id(ptr
->deviceID
))
402 for (offset
= 0; offset
< len
; offset
+= 4) {
403 const void *mem
= start
+ offset
;
405 if ((memcmp(mem
, IMSM_OROM_SIGNATURE
, 4) == 0)) {
414 struct orom_entry
*orom
= add_orom(imsm_mem
);
416 /* only PciDataStructure with revision 3 and above supports devices list. */
417 if (ptr
->pciDataStructRev
>= 3 && ptr
->devListOffset
) {
418 const __u16
*dev_list
= (void *)ptr
+ ptr
->devListOffset
;
421 for (i
= 0; dev_list
[i
] != 0; i
++)
422 add_orom_device_id(orom
, dev_list
[i
]);
424 add_orom_device_id(orom
, __le16_to_cpu(ptr
->deviceID
));
430 const struct imsm_orom
*imsm_platform_test(struct sys_dev
*hba
)
432 struct imsm_orom orom
= {
433 .signature
= IMSM_OROM_SIGNATURE
,
434 .rlc
= IMSM_OROM_RLC_RAID0
| IMSM_OROM_RLC_RAID1
|
435 IMSM_OROM_RLC_RAID10
| IMSM_OROM_RLC_RAID5
,
436 .sss
= IMSM_OROM_SSS_4kB
| IMSM_OROM_SSS_8kB
|
437 IMSM_OROM_SSS_16kB
| IMSM_OROM_SSS_32kB
|
438 IMSM_OROM_SSS_64kB
| IMSM_OROM_SSS_128kB
|
439 IMSM_OROM_SSS_256kB
| IMSM_OROM_SSS_512kB
|
440 IMSM_OROM_SSS_1MB
| IMSM_OROM_SSS_2MB
,
441 .dpa
= IMSM_OROM_DISKS_PER_ARRAY
,
442 .tds
= IMSM_OROM_TOTAL_DISKS
,
443 .vpa
= IMSM_OROM_VOLUMES_PER_ARRAY
,
444 .vphba
= IMSM_OROM_VOLUMES_PER_HBA
446 orom
.attr
= orom
.rlc
| IMSM_OROM_ATTR_ChecksumVerify
;
448 if (check_env("IMSM_TEST_OROM_NORAID5")) {
449 orom
.rlc
= IMSM_OROM_RLC_RAID0
| IMSM_OROM_RLC_RAID1
|
450 IMSM_OROM_RLC_RAID10
;
452 if (check_env("IMSM_TEST_AHCI_EFI_NORAID5") && (hba
->type
== SYS_DEV_SAS
)) {
453 orom
.rlc
= IMSM_OROM_RLC_RAID0
| IMSM_OROM_RLC_RAID1
|
454 IMSM_OROM_RLC_RAID10
;
456 if (check_env("IMSM_TEST_SCU_EFI_NORAID5") && (hba
->type
== SYS_DEV_SATA
)) {
457 orom
.rlc
= IMSM_OROM_RLC_RAID0
| IMSM_OROM_RLC_RAID1
|
458 IMSM_OROM_RLC_RAID10
;
461 struct orom_entry
*ret
= add_orom(&orom
);
463 add_orom_device_id(ret
, hba
->dev_id
);
468 static const struct imsm_orom
*find_imsm_hba_orom(struct sys_dev
*hba
)
472 if (check_env("IMSM_TEST_OROM"))
473 return imsm_platform_test(hba
);
475 /* return empty OROM capabilities in EFI test mode */
476 if (check_env("IMSM_TEST_AHCI_EFI") || check_env("IMSM_TEST_SCU_EFI"))
479 find_intel_devices();
481 if (intel_devices
== NULL
)
484 /* scan option-rom memory looking for an imsm signature */
485 if (check_env("IMSM_SAFE_OROM_SCAN"))
489 if (probe_roms_init(align
) != 0)
492 /* ignore return value - True is returned if both adapater roms are found */
493 scan_adapter_roms(scan
);
496 return get_orom_by_device_id(hba
->dev_id
);
499 #define GUID_STR_MAX 37 /* according to GUID format:
500 * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" */
502 #define EFI_GUID(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7) \
504 {{ (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, ((a) >> 24) & 0xff, \
505 (b) & 0xff, ((b) >> 8) & 0xff, \
506 (c) & 0xff, ((c) >> 8) & 0xff, \
507 (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }})
509 #define SYS_EFI_VAR_PATH "/sys/firmware/efi/vars"
510 #define SYS_EFIVARS_PATH "/sys/firmware/efi/efivars"
511 #define SCU_PROP "RstScuV"
512 #define AHCI_PROP "RstSataV"
513 #define AHCI_SSATA_PROP "RstsSatV"
514 #define AHCI_TSATA_PROP "RsttSatV"
515 #define VMD_PROP "RstUefiV"
517 #define VENDOR_GUID \
518 EFI_GUID(0x193dfefa, 0xa445, 0x4302, 0x99, 0xd8, 0xef, 0x3a, 0xad, 0x1a, 0x04, 0xc6)
520 #define PCI_CLASS_RAID_CNTRL 0x010400
522 static int read_efi_var(void *buffer
, ssize_t buf_size
,
523 const char *variable_name
, struct efi_guid guid
)
526 char buf
[GUID_STR_MAX
];
530 snprintf(path
, PATH_MAX
, "%s/%s-%s", SYS_EFIVARS_PATH
, variable_name
, guid_str(buf
, guid
));
532 fd
= open(path
, O_RDONLY
);
536 /* read the variable attributes and ignore it */
537 n
= read(fd
, buf
, sizeof(__u32
));
543 /* read the variable data */
544 n
= read(fd
, buffer
, buf_size
);
552 static int read_efi_variable(void *buffer
, ssize_t buf_size
,
553 const char *variable_name
, struct efi_guid guid
)
556 char buf
[GUID_STR_MAX
];
558 ssize_t n
, var_data_len
;
560 /* Try to read the variable using the new efivarfs interface first.
561 * If that fails, fall back to the old sysfs-efivars interface. */
562 if (!read_efi_var(buffer
, buf_size
, variable_name
, guid
))
565 snprintf(path
, PATH_MAX
, "%s/%s-%s/size", SYS_EFI_VAR_PATH
, variable_name
, guid_str(buf
, guid
));
567 dprintf("EFI VAR: path=%s\n", path
);
568 /* get size of variable data */
569 dfd
= open(path
, O_RDONLY
);
573 n
= read(dfd
, &buf
, sizeof(buf
));
580 var_data_len
= strtoul(buf
, NULL
, 16);
581 if ((errno
== ERANGE
&& (var_data_len
== LONG_MAX
)) ||
582 (errno
!= 0 && var_data_len
== 0))
586 snprintf(path
, PATH_MAX
, "%s/%s-%s/data", SYS_EFI_VAR_PATH
, variable_name
, guid_str(buf
, guid
));
588 dprintf("EFI VAR: path=%s\n", path
);
589 dfd
= open(path
, O_RDONLY
);
593 n
= read(dfd
, buffer
, buf_size
);
595 if (n
!= var_data_len
|| n
< buf_size
) {
602 const struct imsm_orom
*find_imsm_efi(struct sys_dev
*hba
)
604 struct imsm_orom orom
;
605 struct orom_entry
*ret
;
606 static const char * const sata_efivars
[] = {AHCI_PROP
, AHCI_SSATA_PROP
,
610 if (check_env("IMSM_TEST_AHCI_EFI") || check_env("IMSM_TEST_SCU_EFI"))
611 return imsm_platform_test(hba
);
613 /* OROM test is set, return that there is no EFI capabilities */
614 if (check_env("IMSM_TEST_OROM"))
619 if (!read_efi_variable(&orom
, sizeof(orom
), SCU_PROP
,
625 if (hba
->class != PCI_CLASS_RAID_CNTRL
)
628 for (i
= 0; i
< ARRAY_SIZE(sata_efivars
); i
++) {
629 if (!read_efi_variable(&orom
, sizeof(orom
),
630 sata_efivars
[i
], VENDOR_GUID
))
634 if (i
== ARRAY_SIZE(sata_efivars
))
639 if (!read_efi_variable(&orom
, sizeof(orom
), VMD_PROP
,
647 ret
= add_orom(&orom
);
648 add_orom_device_id(ret
, hba
->dev_id
);
649 ret
->type
= hba
->type
;
654 const struct imsm_orom
*find_imsm_nvme(struct sys_dev
*hba
)
656 static struct orom_entry
*nvme_orom
;
658 if (hba
->type
!= SYS_DEV_NVME
)
662 struct imsm_orom nvme_orom_compat
= {
663 .signature
= IMSM_NVME_OROM_COMPAT_SIGNATURE
,
664 .rlc
= IMSM_OROM_RLC_RAID0
| IMSM_OROM_RLC_RAID1
|
665 IMSM_OROM_RLC_RAID10
| IMSM_OROM_RLC_RAID5
,
666 .sss
= IMSM_OROM_SSS_4kB
| IMSM_OROM_SSS_8kB
|
667 IMSM_OROM_SSS_16kB
| IMSM_OROM_SSS_32kB
|
668 IMSM_OROM_SSS_64kB
| IMSM_OROM_SSS_128kB
,
669 .dpa
= IMSM_OROM_DISKS_PER_ARRAY_NVME
,
670 .tds
= IMSM_OROM_TOTAL_DISKS_NVME
,
671 .vpa
= IMSM_OROM_VOLUMES_PER_ARRAY
,
672 .vphba
= IMSM_OROM_TOTAL_DISKS_NVME
/ 2 * IMSM_OROM_VOLUMES_PER_ARRAY
,
673 .attr
= IMSM_OROM_ATTR_2TB
| IMSM_OROM_ATTR_2TB_DISK
,
674 .driver_features
= IMSM_OROM_CAPABILITIES_EnterpriseSystem
676 nvme_orom
= add_orom(&nvme_orom_compat
);
678 add_orom_device_id(nvme_orom
, hba
->dev_id
);
679 nvme_orom
->type
= SYS_DEV_NVME
;
680 return &nvme_orom
->orom
;
683 const struct imsm_orom
*find_imsm_capability(struct sys_dev
*hba
)
685 const struct imsm_orom
*cap
= get_orom_by_device_id(hba
->dev_id
);
690 if (hba
->type
== SYS_DEV_NVME
)
691 return find_imsm_nvme(hba
);
692 if ((cap
= find_imsm_efi(hba
)) != NULL
)
694 if ((cap
= find_imsm_hba_orom(hba
)) != NULL
)
700 /* Check whether the nvme device is represented by nvme subsytem,
701 * if yes virtual path should be changed to hardware device path,
702 * to allow IMSM capabilities detection.
704 * hardware path to device - if the device is represented via
705 * nvme virtual subsytem
706 * NULL - if the device is not represented via nvme virtual subsytem
708 char *get_nvme_multipath_dev_hw_path(const char *dev_path
)
714 if (strncmp(dev_path
, NVME_SUBSYS_PATH
, strlen(NVME_SUBSYS_PATH
)) != 0)
717 dir
= opendir(dev_path
);
721 for (ent
= readdir(dir
); ent
; ent
= readdir(dir
)) {
722 char buf
[strlen(dev_path
) + strlen(ent
->d_name
) + 1];
724 /* Check if dir is a controller, ignore namespaces*/
725 if (!(strncmp(ent
->d_name
, "nvme", 4) == 0) ||
726 (strrchr(ent
->d_name
, 'n') != &ent
->d_name
[0]))
729 sprintf(buf
, "%s/%s", dev_path
, ent
->d_name
);
730 rp
= realpath(buf
, NULL
);
738 /* Description: Return part or whole realpath for the dev
740 * dev - the device to be quered
741 * dev_level - level of "/device" entries. It allows to caller to access
742 * virtual or physical devices which are on "path" to quered
744 * buf - optional, must be PATH_MAX size. If set, then will be used.
746 char *devt_to_devpath(dev_t dev
, int dev_level
, char *buf
)
748 char device
[PATH_MAX
];
751 unsigned long device_free_len
= sizeof(device
) - 1;
752 char dev_str
[] = "/device";
753 unsigned long dev_str_len
= strlen(dev_str
);
755 snprintf(device
, sizeof(device
), "/sys/dev/block/%d:%d", major(dev
),
758 /* If caller wants block device, return path to it even if it is exposed
762 return realpath(device
, buf
);
764 device_free_len
-= strlen(device
);
765 for (i
= 0; i
< dev_level
; i
++) {
766 if (device_free_len
< dev_str_len
)
769 strncat(device
, dev_str
, device_free_len
);
771 /* Resolve nvme-subsystem abstraction if needed
773 device_free_len
-= dev_str_len
;
777 if (!realpath(device
, rp
))
779 hw_path
= get_nvme_multipath_dev_hw_path(rp
);
781 strcpy(device
, hw_path
);
782 device_free_len
= sizeof(device
) -
789 return realpath(device
, buf
);
792 char *diskfd_to_devpath(int fd
, int dev_level
, char *buf
)
794 /* return the device path for a disk, return NULL on error or fd
795 * refers to a partition
799 if (fstat(fd
, &st
) != 0)
801 if (!S_ISBLK(st
.st_mode
))
804 return devt_to_devpath(st
.st_rdev
, dev_level
, buf
);
807 int path_attached_to_hba(const char *disk_path
, const char *hba_path
)
811 if (check_env("IMSM_TEST_AHCI_DEV") ||
812 check_env("IMSM_TEST_SCU_DEV")) {
816 if (!disk_path
|| !hba_path
)
818 dprintf("hba: %s - disk: %s\n", hba_path
, disk_path
);
819 if (strncmp(disk_path
, hba_path
, strlen(hba_path
)) == 0)
827 int devt_attached_to_hba(dev_t dev
, const char *hba_path
)
829 char *disk_path
= devt_to_devpath(dev
, 1, NULL
);
830 int rc
= path_attached_to_hba(disk_path
, hba_path
);
838 int disk_attached_to_hba(int fd
, const char *hba_path
)
840 char *disk_path
= diskfd_to_devpath(fd
, 1, NULL
);
841 int rc
= path_attached_to_hba(disk_path
, hba_path
);
849 char *vmd_domain_to_controller(struct sys_dev
*hba
, char *buf
)
858 if (hba
->type
!= SYS_DEV_VMD
)
861 dir
= opendir("/sys/bus/pci/drivers/vmd");
865 for (ent
= readdir(dir
); ent
; ent
= readdir(dir
)) {
866 sprintf(path
, "/sys/bus/pci/drivers/vmd/%s/domain/device",
869 if (!realpath(path
, buf
))
872 if (strncmp(buf
, hba
->path
, strlen(buf
)) == 0) {
873 sprintf(path
, "/sys/bus/pci/drivers/vmd/%s", ent
->d_name
);
875 return realpath(path
, buf
);
883 /* Scan over all controller's namespaces and compare nsid value to verify if
884 * current one is supported. The routine doesn't check IMSM capabilities for
885 * namespace. Only one nvme namespace is supported by IMSM.
887 * fd - open descriptor to the nvme namespace
888 * verbose - error logging level
890 * 1 - if namespace is supported
893 int imsm_is_nvme_namespace_supported(int fd
, int verbose
)
897 char cntrl_path
[PATH_MAX
];
898 char ns_path
[PATH_MAX
];
899 unsigned long long lowest_nsid
= ULLONG_MAX
;
900 unsigned long long this_nsid
;
904 if (!diskfd_to_devpath(fd
, 1, cntrl_path
) ||
905 !diskfd_to_devpath(fd
, 0, ns_path
)) {
907 pr_err("Cannot get device paths\n");
912 if (devpath_to_ll(ns_path
, "nsid", &this_nsid
)) {
914 pr_err("Cannot read nsid value for %s",
919 dir
= opendir(cntrl_path
);
923 /* The lowest nvme namespace is supported */
924 for (ent
= readdir(dir
); ent
; ent
= readdir(dir
)) {
925 unsigned long long curr_nsid
;
926 char curr_ns_path
[PATH_MAX
+ 256];
928 if (!strstr(ent
->d_name
, "nvme"))
931 snprintf(curr_ns_path
, sizeof(curr_ns_path
), "%s/%s",
932 cntrl_path
, ent
->d_name
);
934 if (devpath_to_ll(curr_ns_path
, "nsid", &curr_nsid
))
937 if (lowest_nsid
> curr_nsid
)
938 lowest_nsid
= curr_nsid
;
941 if (this_nsid
== lowest_nsid
)
944 pr_err("IMSM is supported on the lowest NVMe namespace\n");
953 /* Verify if multipath is supported by NVMe controller
958 int is_multipath_nvme(int disk_fd
)
960 char ns_path
[PATH_MAX
];
962 if (!diskfd_to_devpath(disk_fd
, 0, ns_path
))
965 if (strncmp(ns_path
, NVME_SUBSYS_PATH
, strlen(NVME_SUBSYS_PATH
)) == 0)