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author | David Bond <dbond@suse.com> | 2016-03-23 21:49:26 -0400 |
---|---|---|
committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2016-05-16 11:14:29 -0400 |
commit | b3c8eb50383178f3a4dcf1dc867001156da6473d (patch) | |
tree | 10a3cc85d4bb4dc77f02aa72e967f7d37cb90ff2 /drivers/scsi/iscsi_boot_sysfs.c | |
parent | 9a99425f0736a416442525ac7b15903173888b86 (diff) | |
download | linux-b3c8eb50383178f3a4dcf1dc867001156da6473d.tar.gz linux-b3c8eb50383178f3a4dcf1dc867001156da6473d.tar.bz2 linux-b3c8eb50383178f3a4dcf1dc867001156da6473d.zip |
ibft: Expose iBFT acpi header via sysfs
Some ethernet adapter vendors are supplying products which support optional
(payed license) features. On some adapters this includes a hardware iscsi
initiator. The same adapters in a normal (no extra licenses) mode of
operation can be used as a software iscsi initiator. In addition, software
iscsi boot initiators are becoming a standard part of many vendors uefi
implementations. This is creating difficulties during early boot/install
determining the proper configuration method for these adapters when they
are used as a boot device.
The attached patch creates sysfs entries to expose information from the
acpi header of the ibft table. This information allows for a method to
easily determining if an ibft table was created by a ethernet card's
firmware or the system uefi/bios. In the case of a hardware initiator this
information in combination with the pci vendor and device id can be used
to ascertain any vendor specific behaviors that need to be accommodated.
Reviewed-by: Lee Duncan <lduncan@suse.com>
Signed-off-by: David Bond <dbond@suse.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/scsi/iscsi_boot_sysfs.c')
-rw-r--r-- | drivers/scsi/iscsi_boot_sysfs.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/drivers/scsi/iscsi_boot_sysfs.c b/drivers/scsi/iscsi_boot_sysfs.c index 8f0ea97cf31f..d453667612f8 100644 --- a/drivers/scsi/iscsi_boot_sysfs.c +++ b/drivers/scsi/iscsi_boot_sysfs.c @@ -306,6 +306,42 @@ static struct attribute_group iscsi_boot_initiator_attr_group = { .is_visible = iscsi_boot_ini_attr_is_visible, }; +/* iBFT ACPI Table attributes */ +iscsi_boot_rd_attr(acpitbl_signature, signature, ISCSI_BOOT_ACPITBL_SIGNATURE); +iscsi_boot_rd_attr(acpitbl_oem_id, oem_id, ISCSI_BOOT_ACPITBL_OEM_ID); +iscsi_boot_rd_attr(acpitbl_oem_table_id, oem_table_id, + ISCSI_BOOT_ACPITBL_OEM_TABLE_ID); + +static struct attribute *acpitbl_attrs[] = { + &iscsi_boot_attr_acpitbl_signature.attr, + &iscsi_boot_attr_acpitbl_oem_id.attr, + &iscsi_boot_attr_acpitbl_oem_table_id.attr, + NULL +}; + +static umode_t iscsi_boot_acpitbl_attr_is_visible(struct kobject *kobj, + struct attribute *attr, int i) +{ + struct iscsi_boot_kobj *boot_kobj = + container_of(kobj, struct iscsi_boot_kobj, kobj); + + if (attr == &iscsi_boot_attr_acpitbl_signature.attr) + return boot_kobj->is_visible(boot_kobj->data, + ISCSI_BOOT_ACPITBL_SIGNATURE); + if (attr == &iscsi_boot_attr_acpitbl_oem_id.attr) + return boot_kobj->is_visible(boot_kobj->data, + ISCSI_BOOT_ACPITBL_OEM_ID); + if (attr == &iscsi_boot_attr_acpitbl_oem_table_id.attr) + return boot_kobj->is_visible(boot_kobj->data, + ISCSI_BOOT_ACPITBL_OEM_TABLE_ID); + return 0; +} + +static struct attribute_group iscsi_boot_acpitbl_attr_group = { + .attrs = acpitbl_attrs, + .is_visible = iscsi_boot_acpitbl_attr_is_visible, +}; + static struct iscsi_boot_kobj * iscsi_boot_create_kobj(struct iscsi_boot_kset *boot_kset, struct attribute_group *attr_group, @@ -436,6 +472,32 @@ iscsi_boot_create_ethernet(struct iscsi_boot_kset *boot_kset, int index, EXPORT_SYMBOL_GPL(iscsi_boot_create_ethernet); /** + * iscsi_boot_create_acpitbl() - create boot acpi table sysfs dir + * @boot_kset: boot kset + * @index: not used + * @data: driver specific data + * @show: attr show function + * @is_visible: attr visibility function + * @release: release function + * + * Note: The boot sysfs lib will free the data passed in for the caller + * when all refs to the acpitbl kobject have been released. + */ +struct iscsi_boot_kobj * +iscsi_boot_create_acpitbl(struct iscsi_boot_kset *boot_kset, int index, + void *data, + ssize_t (*show)(void *data, int type, char *buf), + umode_t (*is_visible)(void *data, int type), + void (*release)(void *data)) +{ + return iscsi_boot_create_kobj(boot_kset, + &iscsi_boot_acpitbl_attr_group, + "acpi_header", index, data, show, + is_visible, release); +} +EXPORT_SYMBOL_GPL(iscsi_boot_create_acpitbl); + +/** * iscsi_boot_create_kset() - creates root sysfs tree * @set_name: name of root dir */ |