[Qemu-devel] [PULL 17/25] s390x/pci: introduce S390PCIBusDevice qdev

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

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

To support definitions of s390 pci attributes in Qemu cmdline, we have
to make current S390PCIBusDevice struct inherit DeviceState and add
three properties for it. Currently we only support definitions of uid
and fid.

'uid' is optionally defined by users, identifies a zpci device and
must be defined with a 16-bit and non-zero unique value.

'fid' ranges from 0x0 to 0xFFFFFFFF. For fid property, we introduce a
new PropertyInfo by the name of s390_pci_fid_propinfo with our special
setter and getter. As 'fid' is optional, introduce 'fid_defined' to
track whether the user specified a fid.

'target' field is to direct qemu to find the corresponding generic PCI
device. It is equal to the 'id' value of one of generic pci devices.
If the user doesn't specify 'id' parameter for a generic pci device,
its 'id' value will be generated automatically and use this value as
'target' to create an associated zpci device.

If the user did not specify 'uid' or 'fid', values are generated
automatically. 'target' is required.

In addition, if a pci device has no associated zpci device, the code
will generate a zpci device automatically for it.

Signed-off-by: Yi Min Zhao <zyimin@linux.vnet.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
---
 hw/s390x/s390-pci-bus.c | 257 ++++++++++++++++++++++++++++++++++++++++++++++--
 hw/s390x/s390-pci-bus.h |  12 ++-
 2 files changed, 261 insertions(+), 8 deletions(-)

diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
index af3263f..8e0f707 100644
--- a/hw/s390x/s390-pci-bus.c
+++ b/hw/s390x/s390-pci-bus.c
@@ -12,6 +12,8 @@
  */
 
 #include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "qapi/visitor.h"
 #include "qemu-common.h"
 #include "cpu.h"
 #include "s390-pci-bus.h"
@@ -96,8 +98,8 @@ S390PCIBusDevice *s390_pci_find_dev_by_fid(uint32_t fid)
     S390pciState *s = s390_get_phb();
 
     for (i = 0; i < PCI_SLOT_MAX; i++) {
-        pbdev = &s->pbdev[i];
-        if ((pbdev->fh != 0) && (pbdev->fid == fid)) {
+        pbdev = s->pbdev[i];
+        if (pbdev && pbdev->fid == fid) {
             return pbdev;
         }
     }
@@ -185,6 +187,50 @@ static uint32_t s390_pci_get_pfh(PCIDevice *pdev)
     return PCI_SLOT(pdev->devfn) | FH_SHM_VFIO;
 }
 
+static S390PCIBusDevice *s390_pci_find_dev_by_uid(uint16_t uid)
+{
+    int i;
+    S390PCIBusDevice *pbdev;
+    S390pciState *s = s390_get_phb();
+
+    for (i = 0; i < PCI_SLOT_MAX; i++) {
+        pbdev = s->pbdev[i];
+        if (!pbdev) {
+            continue;
+        }
+
+        if (pbdev->uid == uid) {
+            return pbdev;
+        }
+    }
+
+    return NULL;
+}
+
+static S390PCIBusDevice *s390_pci_find_dev_by_target(const char *target)
+{
+    int i;
+    S390PCIBusDevice *pbdev;
+    S390pciState *s = s390_get_phb();
+
+    if (!target) {
+        return NULL;
+    }
+
+    for (i = 0; i < PCI_SLOT_MAX; i++) {
+        pbdev = s->pbdev[i];
+        if (!pbdev) {
+            continue;
+        }
+
+        if (!strcmp(pbdev->target, target)) {
+            return pbdev;
+        }
+    }
+
+    return NULL;
+}
+
 S390PCIBusDevice *s390_pci_find_dev_by_idx(uint32_t idx)
 {
     S390PCIBusDevice *pbdev;
@@ -193,7 +239,10 @@ S390PCIBusDevice *s390_pci_find_dev_by_idx(uint32_t idx)
     S390pciState *s = s390_get_phb();
 
     for (i = 0; i < PCI_SLOT_MAX; i++) {
-        pbdev = &s->pbdev[i];
+        pbdev = s->pbdev[i];
+        if (!pbdev) {
+            continue;
+        }
 
         if (pbdev->state == ZPCI_FS_RESERVED) {
             continue;
@@ -213,8 +262,8 @@ S390PCIBusDevice *s390_pci_find_dev_by_fh(uint32_t fh)
     S390pciState *s = s390_get_phb();
     S390PCIBusDevice *pbdev;
 
-    pbdev = &s->pbdev[fh & FH_MASK_INDEX];
-    if (pbdev->fh != 0 && pbdev->fh == fh) {
+    pbdev = s->pbdev[fh & FH_MASK_INDEX];
+    if (pbdev && pbdev->fh == fh) {
         return pbdev;
     }
 
@@ -564,6 +613,22 @@ static int s390_pcihost_setup_msix(S390PCIBusDevice *pbdev)
     return 0;
 }
 
+static S390PCIBusDevice *s390_pci_device_new(const char *target)
+{
+    DeviceState *dev = NULL;
+    S390pciState *s = s390_get_phb();
+
+    dev = qdev_try_create(BUS(s->bus), TYPE_S390_PCI_DEVICE);
+    if (!dev) {
+        return NULL;
+    }
+
+    qdev_prop_set_string(dev, "target", target);
+    qdev_init_nofail(dev);
+
+    return S390_PCI_DEVICE(dev);
+}
+
 static void s390_pcihost_hot_plug(HotplugHandler *hotplug_dev,
                                   DeviceState *dev, Error **errp)
 {
@@ -572,8 +637,24 @@ static void s390_pcihost_hot_plug(HotplugHandler *hotplug_dev,
     S390pciState *s = S390_PCI_HOST_BRIDGE(pci_device_root_bus(pci_dev)
                                            ->qbus.parent);
 
-    pbdev = &s->pbdev[PCI_SLOT(pci_dev->devfn)];
+    if (!dev->id) {
+        /* In the case the PCI device does not define an id */
+        /* we generate one based on the PCI address         */
+        dev->id = g_strdup_printf("auto_%02x:%02x.%01x",
+                                  pci_bus_num(pci_dev->bus),
+                                  PCI_SLOT(pci_dev->devfn),
+                                  PCI_FUNC(pci_dev->devfn));
+    }
+
+    pbdev = s390_pci_find_dev_by_target(dev->id);
+    if (!pbdev) {
+        pbdev = s390_pci_device_new(dev->id);
+        if (!pbdev) {
+            error_setg(errp, "create zpci device failed");
+        }
+    }
 
+    s->pbdev[PCI_SLOT(pci_dev->devfn)] = pbdev;
     pbdev->fid = s390_pci_get_pfid(pci_dev);
     pbdev->pdev = pci_dev;
     pbdev->state = ZPCI_FS_DISABLED;
@@ -596,7 +677,7 @@ static void s390_pcihost_hot_unplug(HotplugHandler *hotplug_dev,
     PCIDevice *pci_dev = PCI_DEVICE(dev);
     S390pciState *s = S390_PCI_HOST_BRIDGE(pci_device_root_bus(pci_dev)
                                            ->qbus.parent);
-    S390PCIBusDevice *pbdev = &s->pbdev[PCI_SLOT(pci_dev->devfn)];
+    S390PCIBusDevice *pbdev = s->pbdev[PCI_SLOT(pci_dev->devfn)];
 
     switch (pbdev->state) {
     case ZPCI_FS_RESERVED:
@@ -648,10 +729,172 @@ static const TypeInfo s390_pcibus_info = {
     .instance_size = sizeof(S390PCIBus),
 };
 
+static uint16_t s390_pci_generate_uid(void)
+{
+    uint16_t uid = 0;
+
+    do {
+        uid++;
+        if (!s390_pci_find_dev_by_uid(uid)) {
+            return uid;
+        }
+    } while (uid < ZPCI_MAX_UID);
+
+    return UID_UNDEFINED;
+}
+
+static uint32_t s390_pci_generate_fid(Error **errp)
+{
+    uint32_t fid = 0;
+
+    while (fid <= ZPCI_MAX_FID) {
+        if (!s390_pci_find_dev_by_fid(fid)) {
+            return fid;
+        }
+
+        if (fid == ZPCI_MAX_FID) {
+            break;
+        }
+
+        fid++;
+    }
+
+    error_setg(errp, "no free fid could be found");
+    return 0;
+}
+
+static void s390_pci_device_realize(DeviceState *dev, Error **errp)
+{
+    S390PCIBusDevice *zpci = S390_PCI_DEVICE(dev);
+
+    if (!zpci->target) {
+        error_setg(errp, "target must be defined");
+        return;
+    }
+
+    if (s390_pci_find_dev_by_target(zpci->target)) {
+        error_setg(errp, "target %s already has an associated zpci device",
+                   zpci->target);
+        return;
+    }
+
+    if (zpci->uid == UID_UNDEFINED) {
+        zpci->uid = s390_pci_generate_uid();
+        if (!zpci->uid) {
+            error_setg(errp, "no free uid could be found");
+            return;
+        }
+    } else if (s390_pci_find_dev_by_uid(zpci->uid)) {
+        error_setg(errp, "uid %u already in use", zpci->uid);
+        return;
+    }
+
+    if (!zpci->fid_defined) {
+        Error *local_error = NULL;
+
+        zpci->fid = s390_pci_generate_fid(&local_error);
+        if (local_error) {
+            error_propagate(errp, local_error);
+            return;
+        }
+    } else if (s390_pci_find_dev_by_fid(zpci->fid)) {
+        error_setg(errp, "fid %u already in use", zpci->fid);
+        return;
+    }
+
+    zpci->state = ZPCI_FS_RESERVED;
+}
+
+static void s390_pci_device_reset(DeviceState *dev)
+{
+    S390PCIBusDevice *pbdev = S390_PCI_DEVICE(dev);
+
+    switch (pbdev->state) {
+    case ZPCI_FS_RESERVED:
+        return;
+    case ZPCI_FS_STANDBY:
+        break;
+    default:
+        pbdev->fh &= ~FH_MASK_ENABLE;
+        pbdev->state = ZPCI_FS_DISABLED;
+        break;
+    }
+
+    if (pbdev->summary_ind) {
+        pci_dereg_irqs(pbdev);
+    }
+    if (pbdev->iommu_enabled) {
+        pci_dereg_ioat(pbdev);
+    }
+
+    pbdev->fmb_addr = 0;
+}
+
+static void s390_pci_get_fid(Object *obj, Visitor *v, const char *name,
+                         void *opaque, Error **errp)
+{
+    Property *prop = opaque;
+    uint32_t *ptr = qdev_get_prop_ptr(DEVICE(obj), prop);
+
+    visit_type_uint32(v, name, ptr, errp);
+}
+
+static void s390_pci_set_fid(Object *obj, Visitor *v, const char *name,
+                         void *opaque, Error **errp)
+{
+    DeviceState *dev = DEVICE(obj);
+    S390PCIBusDevice *zpci = S390_PCI_DEVICE(obj);
+    Property *prop = opaque;
+    uint32_t *ptr = qdev_get_prop_ptr(dev, prop);
+
+    if (dev->realized) {
+        qdev_prop_set_after_realize(dev, name, errp);
+        return;
+    }
+
+    visit_type_uint32(v, name, ptr, errp);
+    zpci->fid_defined = true;
+}
+
+static PropertyInfo s390_pci_fid_propinfo = {
+    .name = "zpci_fid",
+    .get = s390_pci_get_fid,
+    .set = s390_pci_set_fid,
+};
+
+#define DEFINE_PROP_S390_PCI_FID(_n, _s, _f) \
+    DEFINE_PROP(_n, _s, _f, s390_pci_fid_propinfo, uint32_t)
+
+static Property s390_pci_device_properties[] = {
+    DEFINE_PROP_UINT16("uid", S390PCIBusDevice, uid, UID_UNDEFINED),
+    DEFINE_PROP_S390_PCI_FID("fid", S390PCIBusDevice, fid),
+    DEFINE_PROP_STRING("target", S390PCIBusDevice, target),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void s390_pci_device_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->desc = "zpci device";
+    dc->reset = s390_pci_device_reset;
+    dc->bus_type = TYPE_S390_PCI_BUS;
+    dc->realize = s390_pci_device_realize;
+    dc->props = s390_pci_device_properties;
+}
+
+static const TypeInfo s390_pci_device_info = {
+    .name = TYPE_S390_PCI_DEVICE,
+    .parent = TYPE_DEVICE,
+    .instance_size = sizeof(S390PCIBusDevice),
+    .class_init = s390_pci_device_class_init,
+};
+
 static void s390_pci_register_types(void)
 {
     type_register_static(&s390_pcihost_info);
     type_register_static(&s390_pcibus_info);
+    type_register_static(&s390_pci_device_info);
 }
 
 type_init(s390_pci_register_types)
diff --git a/hw/s390x/s390-pci-bus.h b/hw/s390x/s390-pci-bus.h
index ea1efcc..658bda5 100644
--- a/hw/s390x/s390-pci-bus.h
+++ b/hw/s390x/s390-pci-bus.h
@@ -22,6 +22,7 @@
 
 #define TYPE_S390_PCI_HOST_BRIDGE "s390-pcihost"
 #define TYPE_S390_PCI_BUS "s390-pcibus"
+#define TYPE_S390_PCI_DEVICE "zpci"
 #define FH_MASK_ENABLE   0x80000000
 #define FH_MASK_INSTANCE 0x7f000000
 #define FH_MASK_SHM      0x00ff0000
@@ -29,11 +30,16 @@
 #define FH_SHM_VFIO      0x00010000
 #define FH_SHM_EMUL      0x00020000
 #define S390_PCIPT_ADAPTER 2
+#define ZPCI_MAX_FID 0xffffffff
+#define ZPCI_MAX_UID 0xffff
+#define UID_UNDEFINED 0
 
 #define S390_PCI_HOST_BRIDGE(obj) \
     OBJECT_CHECK(S390pciState, (obj), TYPE_S390_PCI_HOST_BRIDGE)
 #define S390_PCI_BUS(obj) \
     OBJECT_CHECK(S390PCIBus, (obj), TYPE_S390_PCI_BUS)
+#define S390_PCI_DEVICE(obj) \
+    OBJECT_CHECK(S390PCIBusDevice, (obj), TYPE_S390_PCI_DEVICE)
 
 #define HP_EVENT_TO_CONFIGURED        0x0301
 #define HP_EVENT_RESERVED_TO_STANDBY  0x0302
@@ -254,11 +260,15 @@ typedef struct S390PCIIOMMU {
 } S390PCIIOMMU;
 
 typedef struct S390PCIBusDevice {
+    DeviceState qdev;
     PCIDevice *pdev;
     ZpciState state;
     bool iommu_enabled;
+    char *target;
+    uint16_t uid;
     uint32_t fh;
     uint32_t fid;
+    bool fid_defined;
     uint64_t g_iota;
     uint64_t pba;
     uint64_t pal;
@@ -281,7 +291,7 @@ typedef struct S390PCIBus {
 typedef struct S390pciState {
     PCIHostState parent_obj;
     S390PCIBus *bus;
-    S390PCIBusDevice pbdev[PCI_SLOT_MAX];
+    S390PCIBusDevice *pbdev[PCI_SLOT_MAX];
     S390PCIIOMMU *iommu[PCI_SLOT_MAX];
     AddressSpace msix_notify_as;
     MemoryRegion msix_notify_mr;
-- 
2.9.0