[Qemu-devel] [PULL 16/25] s390x/pci: introduce S390PCIIOMMU

[Cornelia Huck <cornelia.huck@de.ibm.com>]

From: Yi Min Zhao <zyimin@linux.vnet.ibm.com>

Currently each zpci device holds its own DMA address space and memory
region. At the same time, all instances of zpci device are stored in
S390pciState. So duirng the initialization of S390pciState, all zpci
devices are created and then all DMA address spaces are created. Thus,
when initializing pci devices, their corresponding DMA address spaces
could be found.

But zpci qdev will be introduced later. Zpci device may be initialized
and plugged afterwards generic pci device. So we should initialize all
DMA address spaces and memory regions before initializing zpci devices.

We introduce a new struct named S390PCIIOMMU. And a new field of
S390pciState, which is an array to store all instances of S390PCIIOMMU,
is added so that qemu pci code could find the corresponding DMA
address space when initializing a generic pci device. And this should
be done before the connection of a zpci device and a generic pci
device is built.

Signed-off-by: Yi Min Zhao <zyimin@linux.vnet.ibm.com>
Acked-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
---
 hw/s390x/s390-pci-bus.c | 19 +++++++++++--------
 hw/s390x/s390-pci-bus.h |  9 +++++++--
 2 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
index 0c67c1e..af3263f 100644
--- a/hw/s390x/s390-pci-bus.c
+++ b/hw/s390x/s390-pci-bus.c
@@ -406,7 +406,7 @@ static AddressSpace *s390_pci_dma_iommu(PCIBus *bus, void *opaque, int devfn)
 {
     S390pciState *s = opaque;
 
-    return &s->pbdev[PCI_SLOT(devfn)].as;
+    return &s->iommu[PCI_SLOT(devfn)]->as;
 }
 
 static uint8_t set_ind_atomic(uint64_t ind_loc, uint8_t to_be_set)
@@ -478,15 +478,15 @@ static const MemoryRegionOps s390_msi_ctrl_ops = {
 
 void s390_pci_iommu_enable(S390PCIBusDevice *pbdev)
 {
-    memory_region_init_iommu(&pbdev->iommu_mr, OBJECT(&pbdev->mr),
+    memory_region_init_iommu(&pbdev->iommu_mr, OBJECT(&pbdev->iommu->mr),
                              &s390_iommu_ops, "iommu-s390", pbdev->pal + 1);
-    memory_region_add_subregion(&pbdev->mr, 0, &pbdev->iommu_mr);
+    memory_region_add_subregion(&pbdev->iommu->mr, 0, &pbdev->iommu_mr);
     pbdev->iommu_enabled = true;
 }
 
 void s390_pci_iommu_disable(S390PCIBusDevice *pbdev)
 {
-    memory_region_del_subregion(&pbdev->mr, &pbdev->iommu_mr);
+    memory_region_del_subregion(&pbdev->iommu->mr, &pbdev->iommu_mr);
     object_unparent(OBJECT(&pbdev->iommu_mr));
     pbdev->iommu_enabled = false;
 }
@@ -494,13 +494,15 @@ void s390_pci_iommu_disable(S390PCIBusDevice *pbdev)
 static void s390_pcihost_init_as(S390pciState *s)
 {
     int i;
-    S390PCIBusDevice *pbdev;
+    S390PCIIOMMU *iommu;
 
     for (i = 0; i < PCI_SLOT_MAX; i++) {
-        pbdev = &s->pbdev[i];
-        memory_region_init(&pbdev->mr, OBJECT(s),
+        iommu = g_malloc0(sizeof(S390PCIIOMMU));
+        memory_region_init(&iommu->mr, OBJECT(s),
                            "iommu-root-s390", UINT64_MAX);
-        address_space_init(&pbdev->as, &pbdev->mr, "iommu-pci");
+        address_space_init(&iommu->as, &iommu->mr, "iommu-pci");
+
+        s->iommu[i] = iommu;
     }
 
     memory_region_init_io(&s->msix_notify_mr, OBJECT(s),
@@ -576,6 +578,7 @@ static void s390_pcihost_hot_plug(HotplugHandler *hotplug_dev,
     pbdev->pdev = pci_dev;
     pbdev->state = ZPCI_FS_DISABLED;
     pbdev->fh = s390_pci_get_pfh(pci_dev);
+    pbdev->iommu = s->iommu[PCI_SLOT(pci_dev->devfn)];
 
     s390_pcihost_setup_msix(pbdev);
 
diff --git a/hw/s390x/s390-pci-bus.h b/hw/s390x/s390-pci-bus.h
index c4d4079..ea1efcc 100644
--- a/hw/s390x/s390-pci-bus.h
+++ b/hw/s390x/s390-pci-bus.h
@@ -248,6 +248,11 @@ typedef struct S390MsixInfo {
     uint32_t pba_offset;
 } S390MsixInfo;
 
+typedef struct S390PCIIOMMU {
+    AddressSpace as;
+    MemoryRegion mr;
+} S390PCIIOMMU;
+
 typedef struct S390PCIBusDevice {
     PCIDevice *pdev;
     ZpciState state;
@@ -263,8 +268,7 @@ typedef struct S390PCIBusDevice {
     uint8_t sum;
     S390MsixInfo msix;
     AdapterRoutes routes;
-    AddressSpace as;
-    MemoryRegion mr;
+    S390PCIIOMMU *iommu;
     MemoryRegion iommu_mr;
     IndAddr *summary_ind;
     IndAddr *indicator;
@@ -278,6 +282,7 @@ typedef struct S390pciState {
     PCIHostState parent_obj;
     S390PCIBus *bus;
     S390PCIBusDevice pbdev[PCI_SLOT_MAX];
+    S390PCIIOMMU *iommu[PCI_SLOT_MAX];
     AddressSpace msix_notify_as;
     MemoryRegion msix_notify_mr;
     QTAILQ_HEAD(, SeiContainer) pending_sei;
-- 
2.9.0