s390x/pci: use a PCI Group structure

We use a S390PCIGroup structure to hold the information related to a
zPCI Function group.

This allows us to be ready to support multiple groups and to retrieve
the group information from the host.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

hw/s390x/s390-pci-bus.c

@@ -738,6 +738,46 @@ static void s390_pci_iommu_free(S390pciState *s, PCIBus *bus, int32_t devfn)
     object_unref(OBJECT(iommu));
 }
 
+static S390PCIGroup *s390_group_create(int id)
+{
+    S390PCIGroup *group;
+    S390pciState *s = s390_get_phb();
+
+    group = g_new0(S390PCIGroup, 1);
+    group->id = id;
+    QTAILQ_INSERT_TAIL(&s->zpci_groups, group, link);
+    return group;
+}
+
+S390PCIGroup *s390_group_find(int id)
+{
+    S390PCIGroup *group;
+    S390pciState *s = s390_get_phb();
+
+    QTAILQ_FOREACH(group, &s->zpci_groups, link) {
+        if (group->id == id) {
+            return group;
+        }
+    }
+    return NULL;
+}
+
+static void s390_pci_init_default_group(void)
+{
+    S390PCIGroup *group;
+    ClpRspQueryPciGrp *resgrp;
+
+    group = s390_group_create(ZPCI_DEFAULT_FN_GRP);
+    resgrp = &group->zpci_group;
+    resgrp->fr = 1;
+    stq_p(&resgrp->dasm, 0);
+    stq_p(&resgrp->msia, ZPCI_MSI_ADDR);
+    stw_p(&resgrp->mui, DEFAULT_MUI);
+    stw_p(&resgrp->i, 128);
+    stw_p(&resgrp->maxstbl, 128);
+    resgrp->version = 0;
+}
+
 static void s390_pcihost_realize(DeviceState *dev, Error **errp)
 {
     PCIBus *b;
@@ -766,7 +806,9 @@ static void s390_pcihost_realize(DeviceState *dev, Error **errp)
     QTAILQ_INIT(&s->pending_sei);
     QTAILQ_INIT(&s->zpci_devs);
     QTAILQ_INIT(&s->zpci_dma_limit);
+    QTAILQ_INIT(&s->zpci_groups);
 
+    s390_pci_init_default_group();
     css_register_io_adapters(CSS_IO_ADAPTER_PCI, true, false,
                              S390_ADAPTER_SUPPRESSIBLE, errp);
 }

hw/s390x/s390-pci-inst.c

@@ -298,21 +298,25 @@ int clp_service_call(S390CPU *cpu, uint8_t r2, uintptr_t ra)
         stq_p(&resquery->edma, ZPCI_EDMA_ADDR);
         stl_p(&resquery->fid, pbdev->fid);
         stw_p(&resquery->pchid, 0);
-        stw_p(&resquery->ug, 1);
+        stw_p(&resquery->ug, ZPCI_DEFAULT_FN_GRP);
         stl_p(&resquery->uid, pbdev->uid);
         stw_p(&resquery->hdr.rsp, CLP_RC_OK);
         break;
     }
     case CLP_QUERY_PCI_FNGRP: {
         ClpRspQueryPciGrp *resgrp = (ClpRspQueryPciGrp *)resh;
-        resgrp->fr = 1;
-        stq_p(&resgrp->dasm, 0);
-        stq_p(&resgrp->msia, ZPCI_MSI_ADDR);
-        stw_p(&resgrp->mui, DEFAULT_MUI);
-        stw_p(&resgrp->i, 128);
-        stw_p(&resgrp->maxstbl, 128);
-        resgrp->version = 0;
 
+        ClpReqQueryPciGrp *reqgrp = (ClpReqQueryPciGrp *)reqh;
+        S390PCIGroup *group;
+
+        group = s390_group_find(reqgrp->g);
+        if (!group) {
+            /* We do not allow access to unknown groups */
+            /* The group must have been obtained with a vfio device */
+            stw_p(&resgrp->hdr.rsp, CLP_RC_QUERYPCIFG_PFGID);
+            goto out;
+        }
+        memcpy(resgrp, &group->zpci_group, sizeof(ClpRspQueryPciGrp));
         stw_p(&resgrp->hdr.rsp, CLP_RC_OK);
         break;
     }
@@ -787,7 +791,8 @@ int pcistb_service_call(S390CPU *cpu, uint8_t r1, uint8_t r3, uint64_t gaddr,
     }
     /* Length must be greater than 8, a multiple of 8 */
     /* and not greater than maxstbl */
-    if ((len <= 8) || (len % 8) || (len > pbdev->maxstbl)) {
+    if ((len <= 8) || (len % 8) ||
+        (len > pbdev->pci_group->zpci_group.maxstbl)) {
         goto specification_error;
     }
     /* Do not cross a 4K-byte boundary */

include/hw/s390x/s390-pci-bus.h

@@ -316,6 +316,14 @@ typedef struct ZpciFmb {
 } ZpciFmb;
 QEMU_BUILD_BUG_MSG(offsetof(ZpciFmb, fmt0) != 48, "padding in ZpciFmb");
 
+#define ZPCI_DEFAULT_FN_GRP 0x20
+typedef struct S390PCIGroup {
+    ClpRspQueryPciGrp zpci_group;
+    int id;
+    QTAILQ_ENTRY(S390PCIGroup) link;
+} S390PCIGroup;
+S390PCIGroup *s390_group_find(int id);
+
 struct S390PCIBusDevice {
     DeviceState qdev;
     PCIDevice *pdev;
@@ -333,6 +341,7 @@ struct S390PCIBusDevice {
     uint16_t noi;
     uint16_t maxstbl;
     uint8_t sum;
+    S390PCIGroup *pci_group;
     S390MsixInfo msix;
     AdapterRoutes routes;
     S390PCIIOMMU *iommu;
@@ -358,6 +367,7 @@ struct S390pciState {
     QTAILQ_HEAD(, SeiContainer) pending_sei;
     QTAILQ_HEAD(, S390PCIBusDevice) zpci_devs;
     QTAILQ_HEAD(, S390PCIDMACount) zpci_dma_limit;
+    QTAILQ_HEAD(, S390PCIGroup) zpci_groups;
 };
 
 S390pciState *s390_get_phb(void);