[PATCH v3 1/3] s390/pci: check for relaxed translation capability

Matthew Rosato
2025-01-24T20:17:35Z

For each zdev, record whether or not CLP indicates relaxed translation
capability for the associated device group.

Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
---
arch/s390/include/asm/pci.h | 2 +-
arch/s390/include/asm/pci_clp.h | 4 +++-
arch/s390/pci/pci_clp.c | 1 +
3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h
index 474e1f8d1d3c..8fe4c7a72c0b 100644
--- a/arch/s390/include/asm/pci.h
+++ b/arch/s390/include/asm/pci.h
@@ -144,7 +144,7 @@ struct zpci_dev {
u8 util_str_avail : 1;
u8 irqs_registered : 1;
u8 tid_avail : 1;
- u8 reserved : 1;
+ u8 rtr_avail : 1; /* Relaxed translation allowed */
unsigned int devfn; /* DEVFN part of the RID*/

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 3fff2f7095c8..7ebff39c84b3 100644
--- a/arch/s390/include/asm/pci_clp.h
+++ b/arch/s390/include/asm/pci_clp.h
@@ -156,7 +156,9 @@ struct clp_rsp_query_pci_grp {
u16 : 4;
u16 noi : 12; /* number of interrupts */
u8 version;
- u8 : 6;
+ u8 : 2;
+ u8 rtr : 1; /* Relaxed translation requirement */
+ u8 : 3;
u8 frame : 1;
u8 refresh : 1; /* TLB refresh mode */
u16 : 3;
diff --git a/arch/s390/pci/pci_clp.c b/arch/s390/pci/pci_clp.c
index 14bf7e8d06b7..27248686e588 100644
--- a/arch/s390/pci/pci_clp.c
+++ b/arch/s390/pci/pci_clp.c
@@ -112,6 +112,7 @@ static void clp_store_query_pci_fngrp(struct zpci_dev *zdev,
zdev->version = response->version;
zdev->maxstbl = response->maxstbl;
zdev->dtsm = response->dtsm;
+ zdev->rtr_avail = response->rtr;

switch (response->version) {
case 1:
--
2.48.1