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s390/pci: Expose firmware provided UID Checking state in sysfs

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The sysfs file /sys/bus/pci/devices/<device_id>/uid_is_unique provides
the UID Checking state as a per device attribute, highlighting its
effect of providing the guarantee that a device's UID is unique.
As a device attribute, this parameter is however unavailable if no
device is configured.

Expose the UID Checking state as:
  - A platform-level parameter
  - Available regardless of device presence or state

Signed-off-by: Ramesh Errabolu <ramesh@linux.ibm.com>
Reviewed-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Ramesh Errabolu 2025-09-28 23:38:27 -05:00 committed by Heiko Carstens
parent 4335edb713
commit b043a81ce3
3 changed files with 39 additions and 0 deletions
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10
arch/s390/include/asm/pci.h
View File

@ -246,6 +246,16 @@ int clp_refresh_fh(u32 fid, u32 *fh);
/* UID */
void update_uid_checking(bool new);
/* Firmware Sysfs */
int __init __zpci_fw_sysfs_init(void);
static inline int __init zpci_fw_sysfs_init(void)
{
if (IS_ENABLED(CONFIG_SYSFS))
return __zpci_fw_sysfs_init();
return 0;
}
/* IOMMU Interface */
int zpci_init_iommu(struct zpci_dev *zdev);
void zpci_destroy_iommu(struct zpci_dev *zdev);

4
arch/s390/pci/pci.c
View File

@ -1188,6 +1188,10 @@ static int __init pci_base_init(void)
if (rc)
goto out_find;
rc = zpci_fw_sysfs_init();
if (rc)
goto out_find;
s390_pci_initialized = 1;
return 0;

25
arch/s390/pci/pci_sysfs.c
View File

@ -41,6 +41,9 @@ zpci_attr(segment1, "0x%02x\n", pfip[1]);
zpci_attr(segment2, "0x%02x\n", pfip[2]);
zpci_attr(segment3, "0x%02x\n", pfip[3]);
#define ZPCI_FW_ATTR_RO(_name) \
static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
static ssize_t mio_enabled_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@ -164,6 +167,13 @@ static ssize_t uid_is_unique_show(struct device *dev,
}
static DEVICE_ATTR_RO(uid_is_unique);
static ssize_t uid_checking_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
return sysfs_emit(buf, "%d\n", zpci_unique_uid ? 1 : 0);
}
ZPCI_FW_ATTR_RO(uid_checking);
/* analogous to smbios index */
static ssize_t index_show(struct device *dev,
struct device_attribute *attr, char *buf)
@ -233,3 +243,18 @@ const struct attribute_group pfip_attr_group = {
.name = "pfip",
.attrs = pfip_attrs,
};
static struct attribute *clp_fw_attrs[] = {
&uid_checking_attr.attr,
NULL,
};
static struct attribute_group clp_fw_attr_group = {
.name = "clp",
.attrs = clp_fw_attrs,
};
int __init __zpci_fw_sysfs_init(void)
{
return sysfs_create_group(firmware_kobj, &clp_fw_attr_group);
}