s390/pci: stash dtsm and maxstbl

Store information about what IOAT designation types are supported by
underlying hardware as well as the largest store block size allowed.
These values will be needed by passthrough.

Reviewed-by: Niklas Schnelle <schnelle@linux.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Link: https://lore.kernel.org/r/20220606203325.110625-10-mjrosato@linux.ibm.com
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>

diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h
index 42a4a31..4c5b8fb 100644 (file)
--- a/arch/s390/include/asm/pci.h
+++ b/arch/s390/include/asm/pci.h
@@ -126,9 +126,11 @@ struct zpci_dev {
        u32             gisa;           /* GISA designation for passthrough */
        u16             vfn;            /* virtual function number */
        u16             pchid;          /* physical channel ID */
+       u16             maxstbl;        /* Maximum store block size */
        u8              pfgid;          /* function group ID */
        u8              pft;            /* pci function type */
        u8              port;
+       u8              dtsm;           /* Supported DT mask */
        u8              rid_available   : 1;
        u8              has_hp_slot     : 1;
        u8              has_resources   : 1;

diff --git a/arch/s390/include/asm/pci_clp.h b/arch/s390/include/asm/pci_clp.h
index f3286bc..d6189ed 100644 (file)
--- a/arch/s390/include/asm/pci_clp.h
+++ b/arch/s390/include/asm/pci_clp.h
@@ -153,9 +153,11 @@ struct clp_rsp_query_pci_grp {
        u8                      :  6;
        u8 frame                :  1;
        u8 refresh              :  1;   /* TLB refresh mode */
-       u16 reserved2;
+       u16                     :  3;
+       u16 maxstbl             : 13;   /* Maximum store block size */
        u16 mui;
-       u16                     : 16;
+       u8 dtsm;                        /* Supported DT mask */
+       u8 reserved3;
        u16 maxfaal;
        u16                     :  4;
        u16 dnoi                : 12;

diff --git a/arch/s390/pci/pci_clp.c b/arch/s390/pci/pci_clp.c
index d058c83..ee36779 100644 (file)
--- a/arch/s390/pci/pci_clp.c
+++ b/arch/s390/pci/pci_clp.c
@@ -106,6 +106,8 @@ static void clp_store_query_pci_fngrp(struct zpci_dev *zdev,
        zdev->max_msi = response->noi;
        zdev->fmb_update = response->mui;
        zdev->version = response->version;
+       zdev->maxstbl = response->maxstbl;
+       zdev->dtsm = response->dtsm;
 
        switch (response->version) {
        case 1: