[PATCH 3/4] s390/pci: Get hardware-reported max store block length

Matthew Rosato
2021-01-19T20:07:12Z

We'll need to know this information for vfio passthrough.

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

diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h
index f16ffba..04f1f48 100644
--- a/arch/s390/include/asm/pci.h
+++ b/arch/s390/include/asm/pci.h
@@ -181,6 +181,7 @@ struct zpci_dev {
atomic64_t mapped_pages;
atomic64_t unmapped_pages;

+ u16 maxstbl;
u8 version;
enum pci_bus_speed max_bus_speed;

diff --git a/arch/s390/include/asm/pci_clp.h b/arch/s390/include/asm/pci_clp.h
index 9fb7cbf..ddd1604 100644
--- a/arch/s390/include/asm/pci_clp.h
+++ b/arch/s390/include/asm/pci_clp.h
@@ -155,7 +155,8 @@ struct clp_rsp_query_pci_grp {
u8 : 1;
u8 frame : 1;
u8 refresh : 1; /* TLB refresh mode */
- u16 reserved2;
+ u16 : 3;
+ u16 maxstbl : 13;
u16 mui;
u16 : 16;
u16 maxfaal;
diff --git a/arch/s390/pci/pci_clp.c b/arch/s390/pci/pci_clp.c
index 630f8fc..99b64fe 100644
--- a/arch/s390/pci/pci_clp.c
+++ b/arch/s390/pci/pci_clp.c
@@ -104,6 +104,7 @@ static void clp_store_query_pci_fngrp(struct zpci_dev *zdev,
zdev->fmb_update = response->mui;
zdev->version = response->version;
zdev->relaxed_align = response->relaxed_align;
+ zdev->maxstbl = response->maxstbl;

switch (response->version) {
case 1:
--
1.8.3.1