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[SRU,F,6/12] s390/pci: define RID and RID available

Message ID 20200518182438.392269-7-frank.heimes@canonical.com
State New
Headers show
Series s390x/pci: enumerate pci functions per physical adapter (LP: 1874056) | expand

Commit Message

Frank Heimes May 18, 2020, 6:24 p.m. UTC 
From: Pierre Morel <pmorel@linux.ibm.com>

BugLink: https://bugs.launchpad.net/bugs/1874056

Firmware provides the bus/devfn part of the PCI addresses of a zPCI
function inside the new field RID of the CLP query PCI function
with a bit to know if this field is available to use.

Let's add these fields to the clp_rsp_query_pci structure,
add corresponding fields to zdev and initialize them.

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>
(backported from commit c9a1752b84f1a8f73187c116ff0514b2ab24d878)
Signed-off-by: Frank Heimes <frank.heimes@canonical.com>
---
 arch/s390/include/asm/pci.h     | 3 +++
 arch/s390/include/asm/pci_clp.h | 9 +++++++--
 arch/s390/pci/pci_clp.c         | 3 +++
 3 files changed, 13 insertions(+), 2 deletions(-)
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Patch

diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h
index 5dfcb8db5828..671323481602 100644
--- a/arch/s390/include/asm/pci.h
+++ b/arch/s390/include/asm/pci.h
@@ -112,6 +112,9 @@  struct zpci_dev {
 	u8		pft;		/* pci function type */
 	u16		domain;
 	u8		port;
+	u8		rid_available	: 1;
+	u8		reserved	: 7;
+	unsigned int	devfn;		/* DEVFN part of the RID*/
 
 	struct mutex lock;
 	u8 pfip[CLP_PFIP_NR_SEGMENTS];	/* pci function internal path */
diff --git a/arch/s390/include/asm/pci_clp.h b/arch/s390/include/asm/pci_clp.h
index a7a157bf9784..4391ce82230f 100644
--- a/arch/s390/include/asm/pci_clp.h
+++ b/arch/s390/include/asm/pci_clp.h
@@ -93,7 +93,9 @@  struct clp_req_query_pci {
 struct clp_rsp_query_pci {
 	struct clp_rsp_hdr hdr;
 	u16 vfn;			/* virtual fn number */
-	u16			:  6;
+	u16			:  3;
+	u16 rid_avail		:  1;
+	u16			:  2;
 	u16 mio_addr_avail	:  1;
 	u16 util_str_avail	:  1;	/* utility string available? */
 	u16 pfgid		:  8;	/* pci function group id */
@@ -108,7 +110,10 @@  struct clp_rsp_query_pci {
 	u8 pft;				/* pci function type */
 	u64 sdma;			/* start dma as */
 	u64 edma;			/* end dma as */
-	u32 reserved[11];
+#define ZPCI_RID_MASK_DEVFN 0x00ff
+	u16 rid;			/* BUS/DEVFN PCI address */
+	u16 reserved0;
+	u32 reserved[10];
 	u32 uid;			/* user defined id */
 	u8 util_str[CLP_UTIL_STR_LEN];	/* utility string */
 	u32 reserved2[16];
diff --git a/arch/s390/pci/pci_clp.c b/arch/s390/pci/pci_clp.c
index 193e5b0d0296..f7dfcd9f8b9e 100644
--- a/arch/s390/pci/pci_clp.c
+++ b/arch/s390/pci/pci_clp.c
@@ -158,6 +158,9 @@  static int clp_store_query_pci_fn(struct zpci_dev *zdev,
 	zdev->port = response->port;
 	zdev->uid = response->uid;
 	zdev->fmb_length = sizeof(u32) * response->fmb_len;
+	zdev->rid_available = response->rid_avail;
+	if (!s390_pci_no_rid && zdev->rid_available)
+		zdev->devfn = response->rid & ZPCI_RID_MASK_DEVFN;
 
 	memcpy(zdev->pfip, response->pfip, sizeof(zdev->pfip));
 	if (response->util_str_avail) {