Commit b043a81c authored by Ramesh Errabolu's avatar Ramesh Errabolu Committed by Heiko Carstens
Browse files

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



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: default avatarRamesh Errabolu <ramesh@linux.ibm.com>
Reviewed-by: default avatarNiklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
parent 4335edb7

arch/s390/include/asm/pci.h

+10 −0
Original line number Diff line number Diff line
@@ -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);

arch/s390/pci/pci.c

+4 −0
Original line number Diff line number Diff line
@@ -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;

arch/s390/pci/pci_sysfs.c

+25 −0
Original line number Diff line number Diff line
@@ -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);

}