s390/pci: Expose new port attribute for PCIe functions

Add SysFS attribute that provides the port number for PCI functions
representing a single port of a multi-port device.
Signed-off-by: Alexander Schmidt <alexs@linux.ibm.com>
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

arch/s390/include/asm/pci.h

@@ -108,6 +108,7 @@ struct zpci_dev {
 	u8		pfgid;		/* function group ID */
 	u8		pft;		/* pci function type */
 	u16		domain;
+	u8		port;
 
 	struct mutex lock;
 	u8 pfip[CLP_PFIP_NR_SEGMENTS];	/* pci function internal path */

arch/s390/include/asm/pci_clp.h

@@ -102,7 +102,8 @@ struct clp_rsp_query_pci {
 	u16 pchid;
 	__le32 bar[PCI_STD_NUM_BARS];
 	u8 pfip[CLP_PFIP_NR_SEGMENTS];	/* pci function internal path */
-	u32			: 16;
+	u16			: 12;
+	u16 port		:  4;
 	u8 fmb_len;
 	u8 pft;				/* pci function type */
 	u64 sdma;			/* start dma as */

arch/s390/pci/pci_clp.c

@@ -155,6 +155,7 @@ static int clp_store_query_pci_fn(struct zpci_dev *zdev,
 	zdev->pfgid = response->pfgid;
 	zdev->pft = response->pft;
 	zdev->vfn = response->vfn;
+	zdev->port = response->port;
 	zdev->uid = response->uid;
 	zdev->fmb_length = sizeof(u32) * response->fmb_len;
 

arch/s390/pci/pci_sysfs.c

@@ -33,6 +33,7 @@ zpci_attr(pchid, "0x%04x\n", pchid);
 zpci_attr(pfgid, "0x%02x\n", pfgid);
 zpci_attr(vfn, "0x%04x\n", vfn);
 zpci_attr(pft, "0x%02x\n", pft);
+zpci_attr(port, "%d\n", port);
 zpci_attr(uid, "0x%x\n", uid);
 zpci_attr(segment0, "0x%02x\n", pfip[0]);
 zpci_attr(segment1, "0x%02x\n", pfip[1]);
@@ -142,6 +143,7 @@ static struct attribute *zpci_dev_attrs[] = {
 	&dev_attr_pchid.attr,
 	&dev_attr_pfgid.attr,
 	&dev_attr_pft.attr,
+	&dev_attr_port.attr,
 	&dev_attr_vfn.attr,
 	&dev_attr_uid.attr,
 	&dev_attr_recover.attr,