s390x/pci: assign msix io region for each pci device

For efficiency we now assign one msix io region for each pci device
and provide it with the pointer to the zPCI device as opaque
parameter. In addition, we remove msix address space and add msix io
region as a subregion to the root memory region of pci device.

Signed-off-by: Yi Min Zhao <zyimin@linux.vnet.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

1 files changed, 26 insertions, 11 deletions

diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
index ac8f06d..fe5fc4e 100644
--- a/hw/s390x/s390-pci-bus.c
+++ b/hw/s390x/s390-pci-bus.c
@@ -383,7 +383,6 @@ static IOMMUTLBEntry s390_translate_iommu(MemoryRegion *iommu, hwaddr addr,
     uint64_t pte;
     uint32_t flags;
     S390PCIBusDevice *pbdev = container_of(iommu, S390PCIBusDevice, iommu_mr);
-    S390pciState *s;
     IOMMUTLBEntry ret = {
         .target_as = &address_space_memory,
         .iova = 0,
@@ -405,12 +404,10 @@ static IOMMUTLBEntry s390_translate_iommu(MemoryRegion *iommu, hwaddr addr,
 
     DPRINTF("iommu trans addr 0x%" PRIx64 "\n", addr);
 
-    s = S390_PCI_HOST_BRIDGE(pci_device_root_bus(pbdev->pdev)->qbus.parent);
     /* s390 does not have an APIC mapped to main storage so we use
      * a separate AddressSpace only for msix notifications
      */
     if (addr == ZPCI_MSI_ADDR) {
-        ret.target_as = &s->msix_notify_as;
         ret.iova = addr;
         ret.translated_addr = addr;
         ret.addr_mask = 0xfff;
@@ -476,7 +473,7 @@ static uint8_t set_ind_atomic(uint64_t ind_loc, uint8_t to_be_set)
 static void s390_msi_ctrl_write(void *opaque, hwaddr addr, uint64_t data,
                                 unsigned int size)
 {
-    S390PCIBusDevice *pbdev;
+    S390PCIBusDevice *pbdev = opaque;
     uint32_t io_int_word;
     uint32_t idx = data >> ZPCI_MSI_VEC_BITS;
     uint32_t vec = data & ZPCI_MSI_VEC_MASK;
@@ -486,7 +483,6 @@ static void s390_msi_ctrl_write(void *opaque, hwaddr addr, uint64_t data,
 
     DPRINTF("write_msix data 0x%" PRIx64 " idx %d vec 0x%x\n", data, idx, vec);
 
-    pbdev = s390_pci_find_dev_by_idx(idx);
     if (!pbdev) {
         e |= (vec << ERR_EVENT_MVN_OFFSET);
         s390_pci_generate_error_event(ERR_EVENT_NOMSI, idx, 0, addr, e);
@@ -548,10 +544,6 @@ static void s390_pcihost_init_as(S390pciState *s)
 
         s->iommu[i] = iommu;
     }
-
-    memory_region_init_io(&s->msix_notify_mr, OBJECT(s),
-                          &s390_msi_ctrl_ops, s, "msix-s390", UINT64_MAX);
-    address_space_init(&s->msix_notify_as, &s->msix_notify_mr, "msix-pci");
 }
 
 static int s390_pcihost_init(SysBusDevice *dev)
@@ -581,7 +573,7 @@ static int s390_pcihost_init(SysBusDevice *dev)
     return 0;
 }
 
-static int s390_pcihost_setup_msix(S390PCIBusDevice *pbdev)
+static int s390_pci_setup_msix(S390PCIBusDevice *pbdev)
 {
     uint8_t pos;
     uint16_t ctrl;
@@ -609,6 +601,26 @@ static int s390_pcihost_setup_msix(S390PCIBusDevice *pbdev)
     return 0;
 }
 
+static void s390_pci_msix_init(S390PCIBusDevice *pbdev)
+{
+    char *name;
+
+    name = g_strdup_printf("msix-s390-%04x", pbdev->uid);
+
+    memory_region_init_io(&pbdev->msix_notify_mr, OBJECT(pbdev),
+                          &s390_msi_ctrl_ops, pbdev, name, PAGE_SIZE);
+    memory_region_add_subregion(&pbdev->iommu->mr, ZPCI_MSI_ADDR,
+                                &pbdev->msix_notify_mr);
+
+    g_free(name);
+}
+
+static void s390_pci_msix_free(S390PCIBusDevice *pbdev)
+{
+    memory_region_del_subregion(&pbdev->iommu->mr, &pbdev->msix_notify_mr);
+    object_unparent(OBJECT(&pbdev->msix_notify_mr));
+}
+
 static S390PCIBusDevice *s390_pci_device_new(const char *target)
 {
     DeviceState *dev = NULL;
@@ -662,7 +674,9 @@ static void s390_pcihost_hot_plug(HotplugHandler *hotplug_dev,
         pbdev->pdev = pdev;
         pbdev->iommu = s->iommu[PCI_SLOT(pdev->devfn)];
         pbdev->state = ZPCI_FS_STANDBY;
-        s390_pcihost_setup_msix(pbdev);
+
+        s390_pci_msix_init(pbdev);
+        s390_pci_setup_msix(pbdev);
 
         if (dev->hotplugged) {
             s390_pci_generate_plug_event(HP_EVENT_RESERVED_TO_STANDBY,
@@ -749,6 +763,7 @@ static void s390_pcihost_hot_unplug(HotplugHandler *hotplug_dev,
     s390_pci_generate_plug_event(HP_EVENT_STANDBY_TO_RESERVED,
                                  pbdev->fh, pbdev->fid);
     object_unparent(OBJECT(pci_dev));
+    s390_pci_msix_free(pbdev);
     pbdev->pdev = NULL;
     pbdev->state = ZPCI_FS_RESERVED;
 out: