[PATCH for-7.2 v3 00/11] enable pnv-phb user created devices

[PATCH for-7.2 v3 00/11] enable pnv-phb user created devices

[Daniel Henrique Barboza]

Hi,

This new version contains a new patch (11) to handle the QOM parenting
of user created root ports. A small change in patch 5 was made as well
based on Frederic's comments.

The series is based on top of the ppc-7.2 branch:

https://gitlab.com/danielhb/qemu/-/tree/ppc-7.2

Changes from v2:
- patch 5: avoid parenting the PHB to NULL
- patch 11 (new):
   - fix QOM parenting of user created root ports
- v2 link: https://lists.gnu.org/archive/html/qemu-devel/2022-08/msg00505.html

Daniel Henrique Barboza (11):
  ppc/pnv: add phb-id/chip-id PnvPHB3RootBus properties
  ppc/pnv: add phb-id/chip-id PnvPHB4RootBus properties
  ppc/pnv: set root port chassis and slot using Bus properties
  ppc/pnv: add helpers for pnv-phb user devices
  ppc/pnv: turn chip8->phbs[] into a PnvPHB* array
  ppc/pnv: enable user created pnv-phb for powernv8
  ppc/pnv: add PHB4 helpers for user created pnv-phb
  ppc/pnv: enable user created pnv-phb powernv9
  ppc/pnv: change pnv_phb4_get_pec() to also retrieve chip10->pecs
  ppc/pnv: user creatable pnv-phb for powernv10
  ppc/pnv: fix QOM parenting of user creatable root ports

 hw/pci-host/pnv_phb.c          | 178 +++++++++++++++++++++++++++++----
 hw/pci-host/pnv_phb3.c         |  50 +++++++++
 hw/pci-host/pnv_phb4.c         |  51 ++++++++++
 hw/pci-host/pnv_phb4_pec.c     |   6 +-
 hw/ppc/pnv.c                   |  30 +++++-
 include/hw/pci-host/pnv_phb3.h |   9 +-
 include/hw/pci-host/pnv_phb4.h |  10 ++
 include/hw/ppc/pnv.h           |   6 +-
 8 files changed, 312 insertions(+), 28 deletions(-)

-- 
2.36.1

[PATCH for-7.2 v3 01/11] ppc/pnv: add phb-id/chip-id PnvPHB3RootBus properties

[Daniel Henrique Barboza]

We rely on the phb-id and chip-id, which are PHB properties, to assign
chassis and slot to the root port. For default devices this is no big
deal: the root port is being created under pnv_phb_realize() and the
values are being passed on via the 'index' and 'chip-id' of the
pnv_phb_attach_root_port() helper.

If we want to implement user created root ports we have a problem. The
user created root port will not be aware of which PHB it belongs to,
unless we're willing to violate QOM best practices and access the PHB
via dev->parent_bus->parent. What we can do is to access the root bus
parent bus.

Since we're already assigning the root port as QOM child of the bus, and
the bus is initiated using PHB properties, let's add phb-id and chip-id
as properties of the bus. This will allow us trivial access to them, for
both user-created and default root ports, without doing anything too
shady with QOM.

Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
 hw/pci-host/pnv_phb3.c         | 50 ++++++++++++++++++++++++++++++++++
 include/hw/pci-host/pnv_phb3.h |  9 +++++-
 2 files changed, 58 insertions(+), 1 deletion(-)

diff --git a/hw/pci-host/pnv_phb3.c b/hw/pci-host/pnv_phb3.c
index d4c04a281a..af8575c007 100644
--- a/hw/pci-host/pnv_phb3.c
+++ b/hw/pci-host/pnv_phb3.c
@@ -1006,6 +1006,11 @@ void pnv_phb3_bus_init(DeviceState *dev, PnvPHB3 *phb)
                                      &phb->pci_mmio, &phb->pci_io,
                                      0, 4, TYPE_PNV_PHB3_ROOT_BUS);
 
+    object_property_set_int(OBJECT(pci->bus), "phb-id", phb->phb_id,
+                            &error_abort);
+    object_property_set_int(OBJECT(pci->bus), "chip-id", phb->chip_id,
+                            &error_abort);
+
     pci_setup_iommu(pci->bus, pnv_phb3_dma_iommu, phb);
 }
 
@@ -1105,10 +1110,55 @@ static const TypeInfo pnv_phb3_type_info = {
     .instance_init = pnv_phb3_instance_init,
 };
 
+static void pnv_phb3_root_bus_get_prop(Object *obj, Visitor *v,
+                                       const char *name,
+                                       void *opaque, Error **errp)
+{
+    PnvPHB3RootBus *bus = PNV_PHB3_ROOT_BUS(obj);
+    uint64_t value = 0;
+
+    if (strcmp(name, "phb-id") == 0) {
+        value = bus->phb_id;
+    } else {
+        value = bus->chip_id;
+    }
+
+    visit_type_size(v, name, &value, errp);
+}
+
+static void pnv_phb3_root_bus_set_prop(Object *obj, Visitor *v,
+                                       const char *name,
+                                       void *opaque, Error **errp)
+
+{
+    PnvPHB3RootBus *bus = PNV_PHB3_ROOT_BUS(obj);
+    uint64_t value;
+
+    if (!visit_type_size(v, name, &value, errp)) {
+        return;
+    }
+
+    if (strcmp(name, "phb-id") == 0) {
+        bus->phb_id = value;
+    } else {
+        bus->chip_id = value;
+    }
+}
+
 static void pnv_phb3_root_bus_class_init(ObjectClass *klass, void *data)
 {
     BusClass *k = BUS_CLASS(klass);
 
+    object_class_property_add(klass, "phb-id", "int",
+                              pnv_phb3_root_bus_get_prop,
+                              pnv_phb3_root_bus_set_prop,
+                              NULL, NULL);
+
+    object_class_property_add(klass, "chip-id", "int",
+                              pnv_phb3_root_bus_get_prop,
+                              pnv_phb3_root_bus_set_prop,
+                              NULL, NULL);
+
     /*
      * PHB3 has only a single root complex. Enforce the limit on the
      * parent bus
diff --git a/include/hw/pci-host/pnv_phb3.h b/include/hw/pci-host/pnv_phb3.h
index bff69201d9..4854f6d2f6 100644
--- a/include/hw/pci-host/pnv_phb3.h
+++ b/include/hw/pci-host/pnv_phb3.h
@@ -104,9 +104,16 @@ struct PnvPBCQState {
 };
 
 /*
- * PHB3 PCIe Root port
+ * PHB3 PCIe Root Bus
  */
 #define TYPE_PNV_PHB3_ROOT_BUS "pnv-phb3-root"
+struct PnvPHB3RootBus {
+    PCIBus parent;
+
+    uint32_t chip_id;
+    uint32_t phb_id;
+};
+OBJECT_DECLARE_SIMPLE_TYPE(PnvPHB3RootBus, PNV_PHB3_ROOT_BUS)
 
 /*
  * PHB3 PCIe Host Bridge for PowerNV machines (POWER8)
-- 
2.36.1

[PATCH for-7.2 v3 02/11] ppc/pnv: add phb-id/chip-id PnvPHB4RootBus properties

[Daniel Henrique Barboza]

The same rationale provided in the PHB3 bus case applies here.

Note: we could have merged both buses in a single object, like we did
with the root ports, and spare some boilerplate. The reason we opted to
preserve both buses objects is twofold:

- there's not user side advantage in doing so. Unifying the root ports
presents a clear user QOL change when we enable user created devices back.
The buses objects, aside from having a different QOM name, is transparent
to the user;

- we leave a door opened in case we want to increase the root port limit
for phb4/5 later on without having to deal with phb3 code.

Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
 hw/pci-host/pnv_phb4.c         | 51 ++++++++++++++++++++++++++++++++++
 include/hw/pci-host/pnv_phb4.h | 10 +++++++
 2 files changed, 61 insertions(+)

diff --git a/hw/pci-host/pnv_phb4.c b/hw/pci-host/pnv_phb4.c
index b98c394713..824e1a73fb 100644
--- a/hw/pci-host/pnv_phb4.c
+++ b/hw/pci-host/pnv_phb4.c
@@ -1551,6 +1551,12 @@ void pnv_phb4_bus_init(DeviceState *dev, PnvPHB4 *phb)
                                      pnv_phb4_set_irq, pnv_phb4_map_irq, phb,
                                      &phb->pci_mmio, &phb->pci_io,
                                      0, 4, TYPE_PNV_PHB4_ROOT_BUS);
+
+    object_property_set_int(OBJECT(pci->bus), "phb-id", phb->phb_id,
+                            &error_abort);
+    object_property_set_int(OBJECT(pci->bus), "chip-id", phb->chip_id,
+                            &error_abort);
+
     pci_setup_iommu(pci->bus, pnv_phb4_dma_iommu, phb);
     pci->bus->flags |= PCI_BUS_EXTENDED_CONFIG_SPACE;
 }
@@ -1708,10 +1714,55 @@ static const TypeInfo pnv_phb5_type_info = {
     .instance_size = sizeof(PnvPHB4),
 };
 
+static void pnv_phb4_root_bus_get_prop(Object *obj, Visitor *v,
+                                       const char *name,
+                                       void *opaque, Error **errp)
+{
+    PnvPHB4RootBus *bus = PNV_PHB4_ROOT_BUS(obj);
+    uint64_t value = 0;
+
+    if (strcmp(name, "phb-id") == 0) {
+        value = bus->phb_id;
+    } else {
+        value = bus->chip_id;
+    }
+
+    visit_type_size(v, name, &value, errp);
+}
+
+static void pnv_phb4_root_bus_set_prop(Object *obj, Visitor *v,
+                                       const char *name,
+                                       void *opaque, Error **errp)
+
+{
+    PnvPHB4RootBus *bus = PNV_PHB4_ROOT_BUS(obj);
+    uint64_t value;
+
+    if (!visit_type_size(v, name, &value, errp)) {
+        return;
+    }
+
+    if (strcmp(name, "phb-id") == 0) {
+        bus->phb_id = value;
+    } else {
+        bus->chip_id = value;
+    }
+}
+
 static void pnv_phb4_root_bus_class_init(ObjectClass *klass, void *data)
 {
     BusClass *k = BUS_CLASS(klass);
 
+    object_class_property_add(klass, "phb-id", "int",
+                              pnv_phb4_root_bus_get_prop,
+                              pnv_phb4_root_bus_set_prop,
+                              NULL, NULL);
+
+    object_class_property_add(klass, "chip-id", "int",
+                              pnv_phb4_root_bus_get_prop,
+                              pnv_phb4_root_bus_set_prop,
+                              NULL, NULL);
+
     /*
      * PHB4 has only a single root complex. Enforce the limit on the
      * parent bus
diff --git a/include/hw/pci-host/pnv_phb4.h b/include/hw/pci-host/pnv_phb4.h
index 20aa4819d3..50d4faa001 100644
--- a/include/hw/pci-host/pnv_phb4.h
+++ b/include/hw/pci-host/pnv_phb4.h
@@ -45,7 +45,17 @@ typedef struct PnvPhb4DMASpace {
     QLIST_ENTRY(PnvPhb4DMASpace) list;
 } PnvPhb4DMASpace;
 
+/*
+ * PHB4 PCIe Root Bus
+ */
 #define TYPE_PNV_PHB4_ROOT_BUS "pnv-phb4-root"
+struct PnvPHB4RootBus {
+    PCIBus parent;
+
+    uint32_t chip_id;
+    uint32_t phb_id;
+};
+OBJECT_DECLARE_SIMPLE_TYPE(PnvPHB4RootBus, PNV_PHB4_ROOT_BUS)
 
 /*
  * PHB4 PCIe Host Bridge for PowerNV machines (POWER9)
-- 
2.36.1

[PATCH for-7.2 v3 03/11] ppc/pnv: set root port chassis and slot using Bus properties

[Daniel Henrique Barboza]

For default root ports we have a way of accessing chassis and slot,
before root_port_realize(), via pnv_phb_attach_root_port(). For the
future user created root ports this won't be the case: we can't use
this helper because we don't have access to the PHB phb-id/chip-id
values.

In earlier patches we've added phb-id and chip-id to pnv-phb-root-bus
objects. We're now able to use the bus to retrieve them. The bus is
reachable for both user created and default devices, so we're changing
all the code paths. This also allow us to validate these changes with
the existing default devices.

Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
 hw/pci-host/pnv_phb.c | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/hw/pci-host/pnv_phb.c b/hw/pci-host/pnv_phb.c
index c47ed92462..826c0c144e 100644
--- a/hw/pci-host/pnv_phb.c
+++ b/hw/pci-host/pnv_phb.c
@@ -25,21 +25,19 @@
  * QOM id. 'chip_id' is going to be used as PCIE chassis for the
  * root port.
  */
-static void pnv_phb_attach_root_port(PCIHostState *pci, int index, int chip_id)
+static void pnv_phb_attach_root_port(PCIHostState *pci)
 {
     PCIDevice *root = pci_new(PCI_DEVFN(0, 0), TYPE_PNV_PHB_ROOT_PORT);
-    g_autofree char *default_id = g_strdup_printf("%s[%d]",
-                                                  TYPE_PNV_PHB_ROOT_PORT,
-                                                  index);
     const char *dev_id = DEVICE(root)->id;
+    g_autofree char *default_id = NULL;
+    int index;
+
+    index = object_property_get_int(OBJECT(pci->bus), "phb-id", &error_fatal);
+    default_id = g_strdup_printf("%s[%d]", TYPE_PNV_PHB_ROOT_PORT, index);
 
     object_property_add_child(OBJECT(pci->bus), dev_id ? dev_id : default_id,
                               OBJECT(root));
 
-    /* Set unique chassis/slot values for the root port */
-    qdev_prop_set_uint8(DEVICE(root), "chassis", chip_id);
-    qdev_prop_set_uint16(DEVICE(root), "slot", index);
-
     pci_realize_and_unref(root, pci->bus, &error_fatal);
 }
 
@@ -93,7 +91,7 @@ static void pnv_phb_realize(DeviceState *dev, Error **errp)
         pnv_phb4_bus_init(dev, PNV_PHB4(phb->backend));
     }
 
-    pnv_phb_attach_root_port(pci, phb->phb_id, phb->chip_id);
+    pnv_phb_attach_root_port(pci);
 }
 
 static const char *pnv_phb_root_bus_path(PCIHostState *host_bridge,
@@ -162,9 +160,18 @@ static void pnv_phb_root_port_realize(DeviceState *dev, Error **errp)
 {
     PCIERootPortClass *rpc = PCIE_ROOT_PORT_GET_CLASS(dev);
     PnvPHBRootPort *phb_rp = PNV_PHB_ROOT_PORT(dev);
+    PCIBus *bus = PCI_BUS(qdev_get_parent_bus(dev));
     PCIDevice *pci = PCI_DEVICE(dev);
     uint16_t device_id = 0;
     Error *local_err = NULL;
+    int chip_id, index;
+
+    chip_id = object_property_get_int(OBJECT(bus), "chip-id", &error_fatal);
+    index = object_property_get_int(OBJECT(bus), "phb-id", &error_fatal);
+
+    /* Set unique chassis/slot values for the root port */
+    qdev_prop_set_uint8(dev, "chassis", chip_id);
+    qdev_prop_set_uint16(dev, "slot", index);
 
     rpc->parent_realize(dev, &local_err);
     if (local_err) {
-- 
2.36.1

[PATCH for-7.2 v3 04/11] ppc/pnv: add helpers for pnv-phb user devices

[Daniel Henrique Barboza]

pnv_parent_qom_fixup() and pnv_parent_bus_fixup() are versions of the
helpers that were reverted by commit 9c10d86fee "ppc/pnv: Remove
user-created PHB{3,4,5} devices". They are needed to amend the QOM and
bus hierarchies of user created pnv-phbs, matching them with default
pnv-phbs.

A new helper pnv_phb_user_device_init() is created to handle
user-created devices setup. We're going to call it inside
pnv_phb_realize() in case we're realizing an user created device. This
will centralize all user device realated in a single spot, leaving the
realize functions of the phb3/phb4 backends untouched.

Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
 hw/pci-host/pnv_phb.c | 76 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)

diff --git a/hw/pci-host/pnv_phb.c b/hw/pci-host/pnv_phb.c
index 826c0c144e..18a050a6d3 100644
--- a/hw/pci-host/pnv_phb.c
+++ b/hw/pci-host/pnv_phb.c
@@ -18,6 +18,37 @@
 #include "hw/qdev-properties.h"
 #include "qom/object.h"
 
+
+/*
+ * Set the QOM parent of an object child. If the device state
+ * associated with the child has an id, use it as QOM id. Otherwise
+ * use object_typename[index] as QOM id.
+ */
+static void pnv_parent_qom_fixup(Object *parent, Object *child, int index)
+{
+    g_autofree char *default_id =
+        g_strdup_printf("%s[%d]", object_get_typename(child), index);
+    const char *dev_id = DEVICE(child)->id;
+
+    if (child->parent == parent) {
+        return;
+    }
+
+    object_ref(child);
+    object_unparent(child);
+    object_property_add_child(parent, dev_id ? dev_id : default_id, child);
+    object_unref(child);
+}
+
+static void pnv_parent_bus_fixup(DeviceState *parent, DeviceState *child)
+{
+    BusState *parent_bus = qdev_get_parent_bus(parent);
+
+    if (!qdev_set_parent_bus(child, parent_bus, &error_fatal)) {
+        return;
+    }
+}
+
 /*
  * Attach a root port device.
  *
@@ -41,6 +72,43 @@ static void pnv_phb_attach_root_port(PCIHostState *pci)
     pci_realize_and_unref(root, pci->bus, &error_fatal);
 }
 
+/*
+ * User created devices won't have the initial setup that default
+ * devices have. This setup consists of assigning a parent device
+ * (chip for PHB3, PEC for PHB4/5) that will be the QOM/bus parent
+ * of the PHB.
+ */
+static void pnv_phb_user_device_init(PnvPHB *phb)
+{
+    PnvMachineState *pnv = PNV_MACHINE(qdev_get_machine());
+    PnvChip *chip = pnv_get_chip(pnv, phb->chip_id);
+    Object *parent = NULL;
+
+    if (!chip) {
+        error_setg(&error_fatal, "invalid chip id: %d", phb->chip_id);
+        return;
+    }
+
+    if (phb->version == 3) {
+        parent = OBJECT(chip);
+    } else {
+        /* phb4 support will be added later */
+        return;
+    }
+
+    /*
+     * Reparent user created devices to the chip to build
+     * correctly the device tree. pnv_xscom_dt() needs every
+     * PHB to be a child of the chip to build the DT correctly.
+     *
+     * TODO: for version 3 we're still parenting the PHB with the
+     * chip. We should parent with a (so far not implemented)
+     * PHB3 PEC device.
+     */
+    pnv_parent_qom_fixup(parent, OBJECT(phb), phb->phb_id);
+    pnv_parent_bus_fixup(DEVICE(chip), DEVICE(phb));
+}
+
 static void pnv_phb_realize(DeviceState *dev, Error **errp)
 {
     PnvPHB *phb = PNV_PHB(dev);
@@ -74,6 +142,14 @@ static void pnv_phb_realize(DeviceState *dev, Error **errp)
     object_property_set_uint(phb->backend, "chip-id", phb->chip_id, errp);
     object_property_set_link(phb->backend, "phb-base", OBJECT(phb), errp);
 
+    /*
+     * Handle user created devices. User devices will not have a
+     * pointer to a chip (PHB3) and a PEC (PHB4/5).
+     */
+    if (!phb->chip && !phb->pec) {
+        pnv_phb_user_device_init(phb);
+    }
+
     if (phb->version == 3) {
         object_property_set_link(phb->backend, "chip",
                                  OBJECT(phb->chip), errp);
-- 
2.36.1

[PATCH for-7.2 v3 05/11] ppc/pnv: turn chip8->phbs[] into a PnvPHB* array

[Daniel Henrique Barboza]

When enabling user created PHBs (a change reverted by commit 9c10d86fee)
we were handling PHBs created by default versus by the user in different
manners. The only difference between these PHBs is that one will have a
valid phb3->chip that is assigned during pnv_chip_power8_realize(),
while the user created needs to search which chip it belongs to.

Aside from that there shouldn't be any difference. Making the default
PHBs behave in line with the user created ones will make it easier to
re-introduce them later on. It will also make the code easier to follow
since we are dealing with them in equal manner.

The first step is to turn chip8->phbs[] into a PnvPHB3 pointer array.
This will allow us to assign user created PHBs into it later on. The way
we initilize the default case is now more in line with that would happen
with the user created case: the object is created, parented by the chip
because pnv_xscom_dt() relies on it, and then assigned to the array.

Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
 hw/pci-host/pnv_phb.c |  7 +++++++
 hw/ppc/pnv.c          | 20 +++++++++++++++-----
 include/hw/ppc/pnv.h  |  6 +++++-
 3 files changed, 27 insertions(+), 6 deletions(-)

diff --git a/hw/pci-host/pnv_phb.c b/hw/pci-host/pnv_phb.c
index 18a050a6d3..40a960c54c 100644
--- a/hw/pci-host/pnv_phb.c
+++ b/hw/pci-host/pnv_phb.c
@@ -90,6 +90,13 @@ static void pnv_phb_user_device_init(PnvPHB *phb)
     }
 
     if (phb->version == 3) {
+        Pnv8Chip *chip8 = PNV8_CHIP(chip);
+
+        phb->chip = chip;
+
+        chip8->phbs[chip8->num_phbs] = phb;
+        chip8->num_phbs++;
+
         parent = OBJECT(chip);
     } else {
         /* phb4 support will be added later */
diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index f9e5a3d248..44066ffb8c 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -661,7 +661,7 @@ static void pnv_chip_power8_pic_print_info(PnvChip *chip, Monitor *mon)
     ics_pic_print_info(&chip8->psi.ics, mon);
 
     for (i = 0; i < chip8->num_phbs; i++) {
-        PnvPHB *phb = &chip8->phbs[i];
+        PnvPHB *phb = chip8->phbs[i];
         PnvPHB3 *phb3 = PNV_PHB3(phb->backend);
 
         pnv_phb3_msi_pic_print_info(&phb3->msis, mon);
@@ -1154,7 +1154,17 @@ static void pnv_chip_power8_instance_init(Object *obj)
     chip8->num_phbs = pcc->num_phbs;
 
     for (i = 0; i < chip8->num_phbs; i++) {
-        object_initialize_child(obj, "phb[*]", &chip8->phbs[i], TYPE_PNV_PHB);
+        PnvPHB *phb = PNV_PHB(object_new(TYPE_PNV_PHB));
+
+        /*
+         * We need the chip to parent the PHB to allow the DT
+         * to build correctly (via pnv_xscom_dt()).
+         *
+         * TODO: the PHB should be parented by a PEC device that, at
+         * this moment, is not modelled powernv8/phb3.
+         */
+        object_property_add_child(obj, "phb[*]", OBJECT(phb));
+        chip8->phbs[i] = phb;
     }
 
 }
@@ -1270,7 +1280,7 @@ static void pnv_chip_power8_realize(DeviceState *dev, Error **errp)
 
     /* PHB controllers */
     for (i = 0; i < chip8->num_phbs; i++) {
-        PnvPHB *phb = &chip8->phbs[i];
+        PnvPHB *phb = chip8->phbs[i];
 
         object_property_set_int(OBJECT(phb), "index", i, &error_fatal);
         object_property_set_int(OBJECT(phb), "chip-id", chip->chip_id,
@@ -1938,7 +1948,7 @@ static ICSState *pnv_ics_get(XICSFabric *xi, int irq)
         }
 
         for (j = 0; j < chip8->num_phbs; j++) {
-            PnvPHB *phb = &chip8->phbs[j];
+            PnvPHB *phb = chip8->phbs[j];
             PnvPHB3 *phb3 = PNV_PHB3(phb->backend);
 
             if (ics_valid_irq(&phb3->lsis, irq)) {
@@ -1977,7 +1987,7 @@ static void pnv_ics_resend(XICSFabric *xi)
         ics_resend(&chip8->psi.ics);
 
         for (j = 0; j < chip8->num_phbs; j++) {
-            PnvPHB *phb = &chip8->phbs[j];
+            PnvPHB *phb = chip8->phbs[j];
             PnvPHB3 *phb3 = PNV_PHB3(phb->backend);
 
             ics_resend(&phb3->lsis);
diff --git a/include/hw/ppc/pnv.h b/include/hw/ppc/pnv.h
index 033d907287..aea6128e7f 100644
--- a/include/hw/ppc/pnv.h
+++ b/include/hw/ppc/pnv.h
@@ -81,7 +81,11 @@ struct Pnv8Chip {
     PnvHomer     homer;
 
 #define PNV8_CHIP_PHB3_MAX 4
-    PnvPHB       phbs[PNV8_CHIP_PHB3_MAX];
+    /*
+     * The array is used to allow quick access to the phbs by
+     * pnv_ics_get_child() and pnv_ics_resend_child().
+     */
+    PnvPHB       *phbs[PNV8_CHIP_PHB3_MAX];
     uint32_t     num_phbs;
 
     XICSFabric    *xics;
-- 
2.36.1

[PATCH for-7.2 v3 06/11] ppc/pnv: enable user created pnv-phb for powernv8

[Daniel Henrique Barboza]

The bulk of the work was already done by previous patches.

Use defaults_enabled() to determine whether we need to create the
default devices or not.

Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
 hw/pci-host/pnv_phb.c | 9 +++++++--
 hw/ppc/pnv.c          | 6 ++++++
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/hw/pci-host/pnv_phb.c b/hw/pci-host/pnv_phb.c
index 40a960c54c..887b25d49e 100644
--- a/hw/pci-host/pnv_phb.c
+++ b/hw/pci-host/pnv_phb.c
@@ -17,6 +17,7 @@
 #include "hw/ppc/pnv.h"
 #include "hw/qdev-properties.h"
 #include "qom/object.h"
+#include "sysemu/sysemu.h"
 
 
 /*
@@ -174,6 +175,10 @@ static void pnv_phb_realize(DeviceState *dev, Error **errp)
         pnv_phb4_bus_init(dev, PNV_PHB4(phb->backend));
     }
 
+    if (phb->version == 3 && !defaults_enabled()) {
+        return;
+    }
+
     pnv_phb_attach_root_port(pci);
 }
 
@@ -209,7 +214,7 @@ static void pnv_phb_class_init(ObjectClass *klass, void *data)
     dc->realize = pnv_phb_realize;
     device_class_set_props(dc, pnv_phb_properties);
     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
-    dc->user_creatable = false;
+    dc->user_creatable = true;
 }
 
 static void pnv_phb_root_port_reset(DeviceState *dev)
@@ -300,7 +305,7 @@ static void pnv_phb_root_port_class_init(ObjectClass *klass, void *data)
     device_class_set_parent_reset(dc, pnv_phb_root_port_reset,
                                   &rpc->parent_reset);
     dc->reset = &pnv_phb_root_port_reset;
-    dc->user_creatable = false;
+    dc->user_creatable = true;
 
     k->vendor_id = PCI_VENDOR_ID_IBM;
     /* device_id will be written during realize() */
diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index 44066ffb8c..0d3a88578b 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -1151,6 +1151,10 @@ static void pnv_chip_power8_instance_init(Object *obj)
 
     object_initialize_child(obj, "homer", &chip8->homer, TYPE_PNV8_HOMER);
 
+    if (!defaults_enabled()) {
+        return;
+    }
+
     chip8->num_phbs = pcc->num_phbs;
 
     for (i = 0; i < chip8->num_phbs; i++) {
@@ -2103,6 +2107,8 @@ static void pnv_machine_power8_class_init(ObjectClass *oc, void *data)
 
     pmc->compat = compat;
     pmc->compat_size = sizeof(compat);
+
+    machine_class_allow_dynamic_sysbus_dev(mc, TYPE_PNV_PHB);
 }
 
 static void pnv_machine_power9_class_init(ObjectClass *oc, void *data)
-- 
2.36.1

[PATCH for-7.2 v3 07/11] ppc/pnv: add PHB4 helpers for user created pnv-phb

[Daniel Henrique Barboza]

The PHB4 backend relies on a link with the corresponding PEC element.
This is trivial to do during machine_init() time for default devices,
but not so much for user created ones.

pnv_phb4_get_pec() is a small variation of the function that was
reverted by commit 9c10d86fee "ppc/pnv: Remove user-created PHB{3,4,5}
devices". We'll use it to determine the appropriate PEC for a given user
created pnv-phb that uses a PHB4 backend.

This is done during realize() time, in pnv_phb_user_device_init().

Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
 hw/pci-host/pnv_phb.c | 40 ++++++++++++++++++++++++++++++++++++++--
 1 file changed, 38 insertions(+), 2 deletions(-)

diff --git a/hw/pci-host/pnv_phb.c b/hw/pci-host/pnv_phb.c
index 887b25d49e..f9516fdc4a 100644
--- a/hw/pci-host/pnv_phb.c
+++ b/hw/pci-host/pnv_phb.c
@@ -50,6 +50,34 @@ static void pnv_parent_bus_fixup(DeviceState *parent, DeviceState *child)
     }
 }
 
+static PnvPhb4PecState *pnv_phb4_get_pec(PnvChip *chip, PnvPHB4 *phb,
+                                         Error **errp)
+{
+    Pnv9Chip *chip9 = PNV9_CHIP(chip);
+    int chip_id = phb->chip_id;
+    int index = phb->phb_id;
+    int i, j;
+
+    for (i = 0; i < chip->num_pecs; i++) {
+        /*
+         * For each PEC, check the amount of phbs it supports
+         * and see if the given phb4 index matches an index.
+         */
+        PnvPhb4PecState *pec = &chip9->pecs[i];
+
+        for (j = 0; j < pec->num_phbs; j++) {
+            if (index == pnv_phb4_pec_get_phb_id(pec, j)) {
+                return pec;
+            }
+        }
+    }
+    error_setg(errp,
+               "pnv-phb4 chip-id %d index %d didn't match any existing PEC",
+               chip_id, index);
+
+    return NULL;
+}
+
 /*
  * Attach a root port device.
  *
@@ -100,8 +128,16 @@ static void pnv_phb_user_device_init(PnvPHB *phb)
 
         parent = OBJECT(chip);
     } else {
-        /* phb4 support will be added later */
-        return;
+        Error *local_err = NULL;
+
+        phb->pec = pnv_phb4_get_pec(chip, PNV_PHB4(phb->backend), &local_err);
+
+        if (local_err) {
+            error_propagate(&error_fatal, local_err);
+            return;
+        }
+
+        parent = OBJECT(phb->pec);
     }
 
     /*
-- 
2.36.1

[PATCH for-7.2 v3 08/11] ppc/pnv: enable user created pnv-phb powernv9

[Daniel Henrique Barboza]

Enable pnv-phb user created devices for powernv9 now that we have
everything in place.

Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
 hw/pci-host/pnv_phb.c      | 2 +-
 hw/pci-host/pnv_phb4_pec.c | 6 ++++--
 hw/ppc/pnv.c               | 2 ++
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/hw/pci-host/pnv_phb.c b/hw/pci-host/pnv_phb.c
index f9516fdc4a..a142b8ff8d 100644
--- a/hw/pci-host/pnv_phb.c
+++ b/hw/pci-host/pnv_phb.c
@@ -211,7 +211,7 @@ static void pnv_phb_realize(DeviceState *dev, Error **errp)
         pnv_phb4_bus_init(dev, PNV_PHB4(phb->backend));
     }
 
-    if (phb->version == 3 && !defaults_enabled()) {
+    if (!defaults_enabled()) {
         return;
     }
 
diff --git a/hw/pci-host/pnv_phb4_pec.c b/hw/pci-host/pnv_phb4_pec.c
index 8dc363d69c..9871f462cd 100644
--- a/hw/pci-host/pnv_phb4_pec.c
+++ b/hw/pci-host/pnv_phb4_pec.c
@@ -146,8 +146,10 @@ static void pnv_pec_realize(DeviceState *dev, Error **errp)
     pec->num_phbs = pecc->num_phbs[pec->index];
 
     /* Create PHBs if running with defaults */
-    for (i = 0; i < pec->num_phbs; i++) {
-        pnv_pec_default_phb_realize(pec, i, errp);
+    if (defaults_enabled()) {
+        for (i = 0; i < pec->num_phbs; i++) {
+            pnv_pec_default_phb_realize(pec, i, errp);
+        }
     }
 
     /* Initialize the XSCOM regions for the PEC registers */
diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index 0d3a88578b..b6314dc961 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -2134,6 +2134,8 @@ static void pnv_machine_power9_class_init(ObjectClass *oc, void *data)
     pmc->compat = compat;
     pmc->compat_size = sizeof(compat);
     pmc->dt_power_mgt = pnv_dt_power_mgt;
+
+    machine_class_allow_dynamic_sysbus_dev(mc, TYPE_PNV_PHB);
 }
 
 static void pnv_machine_power10_class_init(ObjectClass *oc, void *data)
-- 
2.36.1

[PATCH for-7.2 v3 09/11] ppc/pnv: change pnv_phb4_get_pec() to also retrieve chip10->pecs

[Daniel Henrique Barboza]

The function assumes that we're always dealing with a PNV9_CHIP()
object. This is not the case when the pnv-phb device belongs to a
powernv10 machine.

Change pnv_phb4_get_pec() to be able to work with PNV10_CHIP() if
necessary.

Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
 hw/pci-host/pnv_phb.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/hw/pci-host/pnv_phb.c b/hw/pci-host/pnv_phb.c
index a142b8ff8d..feaef8137f 100644
--- a/hw/pci-host/pnv_phb.c
+++ b/hw/pci-host/pnv_phb.c
@@ -53,17 +53,30 @@ static void pnv_parent_bus_fixup(DeviceState *parent, DeviceState *child)
 static PnvPhb4PecState *pnv_phb4_get_pec(PnvChip *chip, PnvPHB4 *phb,
                                          Error **errp)
 {
-    Pnv9Chip *chip9 = PNV9_CHIP(chip);
+    PnvPHB *phb_base = phb->phb_base;
+    PnvPhb4PecState *pecs = NULL;
     int chip_id = phb->chip_id;
     int index = phb->phb_id;
     int i, j;
 
+    if (phb_base->version == 4) {
+        Pnv9Chip *chip9 = PNV9_CHIP(chip);
+
+        pecs = chip9->pecs;
+    } else if (phb_base->version == 5) {
+        Pnv10Chip *chip10 = PNV10_CHIP(chip);
+
+        pecs = chip10->pecs;
+    } else {
+        return NULL;
+    }
+
     for (i = 0; i < chip->num_pecs; i++) {
         /*
          * For each PEC, check the amount of phbs it supports
          * and see if the given phb4 index matches an index.
          */
-        PnvPhb4PecState *pec = &chip9->pecs[i];
+        PnvPhb4PecState *pec = &pecs[i];
 
         for (j = 0; j < pec->num_phbs; j++) {
             if (index == pnv_phb4_pec_get_phb_id(pec, j)) {
-- 
2.36.1

[PATCH for-7.2 v3 10/11] ppc/pnv: user creatable pnv-phb for powernv10

[Daniel Henrique Barboza]

Given that powernv9 and powernv10 uses the same pnv-phb backend, the
logic to allow user created pnv-phbs for powernv10 is already in place.
Let's flip the switch.

Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
 hw/ppc/pnv.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index b6314dc961..02f287feab 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -2159,6 +2159,8 @@ static void pnv_machine_power10_class_init(ObjectClass *oc, void *data)
     pmc->dt_power_mgt = pnv_dt_power_mgt;
 
     xfc->match_nvt = pnv10_xive_match_nvt;
+
+    machine_class_allow_dynamic_sysbus_dev(mc, TYPE_PNV_PHB);
 }
 
 static bool pnv_machine_get_hb(Object *obj, Error **errp)
-- 
2.36.1

[PATCH for-7.2 v3 11/11] ppc/pnv: fix QOM parenting of user creatable root ports

[Daniel Henrique Barboza]

User creatable root ports are being parented by the 'peripheral' or the
'peripheral-anon' container. This happens because this is the regular
QOM schema for sysbus devices that are added via the command line.

Let's make this QOM hierarchy similar to what we have with default root
ports, i.e. the root port must be parented by the pnv-root-bus. To do
that we change the qom and bus parent of the root port during
root_port_realize(). The realize() is shared by the default root port
code path, so we can remove the code inside pnv_phb_attach_root_port()
that was adding the root port as a child of the bus as well.

While we're at it, change pnv_phb_attach_root_port() to receive a PCIBus
instead of a PCIHostState to make it clear that the function does not
make use of the PHB.

Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
 hw/pci-host/pnv_phb.c | 36 ++++++++++++++++--------------------
 1 file changed, 16 insertions(+), 20 deletions(-)

diff --git a/hw/pci-host/pnv_phb.c b/hw/pci-host/pnv_phb.c
index feaef8137f..09cea12091 100644
--- a/hw/pci-host/pnv_phb.c
+++ b/hw/pci-host/pnv_phb.c
@@ -91,27 +91,11 @@ static PnvPhb4PecState *pnv_phb4_get_pec(PnvChip *chip, PnvPHB4 *phb,
     return NULL;
 }
 
-/*
- * Attach a root port device.
- *
- * 'index' will be used both as a PCIE slot value and to calculate
- * QOM id. 'chip_id' is going to be used as PCIE chassis for the
- * root port.
- */
-static void pnv_phb_attach_root_port(PCIHostState *pci)
+static void pnv_phb_attach_root_port(PCIBus *bus)
 {
     PCIDevice *root = pci_new(PCI_DEVFN(0, 0), TYPE_PNV_PHB_ROOT_PORT);
-    const char *dev_id = DEVICE(root)->id;
-    g_autofree char *default_id = NULL;
-    int index;
 
-    index = object_property_get_int(OBJECT(pci->bus), "phb-id", &error_fatal);
-    default_id = g_strdup_printf("%s[%d]", TYPE_PNV_PHB_ROOT_PORT, index);
-
-    object_property_add_child(OBJECT(pci->bus), dev_id ? dev_id : default_id,
-                              OBJECT(root));
-
-    pci_realize_and_unref(root, pci->bus, &error_fatal);
+    pci_realize_and_unref(root, bus, &error_fatal);
 }
 
 /*
@@ -228,7 +212,7 @@ static void pnv_phb_realize(DeviceState *dev, Error **errp)
         return;
     }
 
-    pnv_phb_attach_root_port(pci);
+    pnv_phb_attach_root_port(pci->bus);
 }
 
 static const char *pnv_phb_root_bus_path(PCIHostState *host_bridge,
@@ -297,12 +281,19 @@ static void pnv_phb_root_port_realize(DeviceState *dev, Error **errp)
 {
     PCIERootPortClass *rpc = PCIE_ROOT_PORT_GET_CLASS(dev);
     PnvPHBRootPort *phb_rp = PNV_PHB_ROOT_PORT(dev);
-    PCIBus *bus = PCI_BUS(qdev_get_parent_bus(dev));
+    BusState *qbus = qdev_get_parent_bus(dev);
+    PCIBus *bus = PCI_BUS(qbus);
     PCIDevice *pci = PCI_DEVICE(dev);
     uint16_t device_id = 0;
     Error *local_err = NULL;
     int chip_id, index;
 
+
+    /*
+     * 'index' will be used both as a PCIE slot value and to calculate
+     * QOM id. 'chip_id' is going to be used as PCIE chassis for the
+     * root port.
+     */
     chip_id = object_property_get_int(OBJECT(bus), "chip-id", &error_fatal);
     index = object_property_get_int(OBJECT(bus), "phb-id", &error_fatal);
 
@@ -310,6 +301,11 @@ static void pnv_phb_root_port_realize(DeviceState *dev, Error **errp)
     qdev_prop_set_uint8(dev, "chassis", chip_id);
     qdev_prop_set_uint16(dev, "slot", index);
 
+    pnv_parent_qom_fixup(OBJECT(bus), OBJECT(dev), index);
+    if (!qdev_set_parent_bus(dev, qbus, &error_fatal)) {
+        return;
+    }
+
     rpc->parent_realize(dev, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
-- 
2.36.1

Re: [PATCH for-7.2 v3 04/11] ppc/pnv: add helpers for pnv-phb user devices

[Cédric Le Goater]

On 8/10/22 12:05, Daniel Henrique Barboza wrote:
> pnv_parent_qom_fixup() and pnv_parent_bus_fixup() are versions of the
> helpers that were reverted by commit 9c10d86fee "ppc/pnv: Remove
> user-created PHB{3,4,5} devices". They are needed to amend the QOM and
> bus hierarchies of user created pnv-phbs, matching them with default
> pnv-phbs.
> 
> A new helper pnv_phb_user_device_init() is created to handle
> user-created devices setup. We're going to call it inside
> pnv_phb_realize() in case we're realizing an user created device. This
> will centralize all user device realated in a single spot, leaving the
> realize functions of the phb3/phb4 backends untouched.
> 
> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
> ---
>   hw/pci-host/pnv_phb.c | 76 +++++++++++++++++++++++++++++++++++++++++++
>   1 file changed, 76 insertions(+)
> 
> diff --git a/hw/pci-host/pnv_phb.c b/hw/pci-host/pnv_phb.c
> index 826c0c144e..18a050a6d3 100644
> --- a/hw/pci-host/pnv_phb.c
> +++ b/hw/pci-host/pnv_phb.c
> @@ -18,6 +18,37 @@
>   #include "hw/qdev-properties.h"
>   #include "qom/object.h"
>   
> +
> +/*
> + * Set the QOM parent of an object child. If the device state
> + * associated with the child has an id, use it as QOM id. Otherwise
> + * use object_typename[index] as QOM id.
> + */
> +static void pnv_parent_qom_fixup(Object *parent, Object *child, int index)
> +{
> +    g_autofree char *default_id =
> +        g_strdup_printf("%s[%d]", object_get_typename(child), index);
> +    const char *dev_id = DEVICE(child)->id;
> +
> +    if (child->parent == parent) {
> +        return;
> +    }
> +
> +    object_ref(child);
> +    object_unparent(child);
> +    object_property_add_child(parent, dev_id ? dev_id : default_id, child);
> +    object_unref(child);
> +}
> +
> +static void pnv_parent_bus_fixup(DeviceState *parent, DeviceState *child)
> +{
> +    BusState *parent_bus = qdev_get_parent_bus(parent);
> +
> +    if (!qdev_set_parent_bus(child, parent_bus, &error_fatal)) {
> +        return;
> +    }
> +}
> +
>   /*
>    * Attach a root port device.
>    *
> @@ -41,6 +72,43 @@ static void pnv_phb_attach_root_port(PCIHostState *pci)
>       pci_realize_and_unref(root, pci->bus, &error_fatal);
>   }
>   
> +/*
> + * User created devices won't have the initial setup that default
> + * devices have. This setup consists of assigning a parent device
> + * (chip for PHB3, PEC for PHB4/5) that will be the QOM/bus parent
> + * of the PHB.
> + */
> +static void pnv_phb_user_device_init(PnvPHB *phb)

Why not pass an errp to this routine ?

> +{
> +    PnvMachineState *pnv = PNV_MACHINE(qdev_get_machine());
> +    PnvChip *chip = pnv_get_chip(pnv, phb->chip_id);
> +    Object *parent = NULL;
> +
> +    if (!chip) {
> +        error_setg(&error_fatal, "invalid chip id: %d", phb->chip_id);

that you could use here.

> +        return;
> +    }
> +
> +    if (phb->version == 3) {
> +        parent = OBJECT(chip);
> +    } else {
> +        /* phb4 support will be added later */
> +        return;
> +    }
> +
> +    /*
> +     * Reparent user created devices to the chip to build
> +     * correctly the device tree. pnv_xscom_dt() needs every
> +     * PHB to be a child of the chip to build the DT correctly.
> +     *
> +     * TODO: for version 3 we're still parenting the PHB with the
> +     * chip. We should parent with a (so far not implemented)
> +     * PHB3 PEC device.
> +     */
> +    pnv_parent_qom_fixup(parent, OBJECT(phb), phb->phb_id);
> +    pnv_parent_bus_fixup(DEVICE(chip), DEVICE(phb));

and in pnv_parent_bus_fixup() also,

> +}
> +
>   static void pnv_phb_realize(DeviceState *dev, Error **errp)
>   {
>       PnvPHB *phb = PNV_PHB(dev);
> @@ -74,6 +142,14 @@ static void pnv_phb_realize(DeviceState *dev, Error **errp)
>       object_property_set_uint(phb->backend, "chip-id", phb->chip_id, errp);
>       object_property_set_link(phb->backend, "phb-base", OBJECT(phb), errp);
>   
> +    /*
> +     * Handle user created devices. User devices will not have a
> +     * pointer to a chip (PHB3) and a PEC (PHB4/5).
> +     */
> +    if (!phb->chip && !phb->pec) {
> +        pnv_phb_user_device_init(phb);

and return the error message to the caller of pnv_phb_realize()

C.


> +    }
> +
>       if (phb->version == 3) {
>           object_property_set_link(phb->backend, "chip",
>                                    OBJECT(phb->chip), errp);

Re: [PATCH for-7.2 v3 05/11] ppc/pnv: turn chip8->phbs[] into a PnvPHB* array

[Cédric Le Goater]

On 8/10/22 12:05, Daniel Henrique Barboza wrote:
> When enabling user created PHBs (a change reverted by commit 9c10d86fee)
> we were handling PHBs created by default versus by the user in different
> manners. The only difference between these PHBs is that one will have a
> valid phb3->chip that is assigned during pnv_chip_power8_realize(),
> while the user created needs to search which chip it belongs to.
> 
> Aside from that there shouldn't be any difference. Making the default
> PHBs behave in line with the user created ones will make it easier to
> re-introduce them later on. It will also make the code easier to follow
> since we are dealing with them in equal manner.
> 
> The first step is to turn chip8->phbs[] into a PnvPHB3 pointer array.
> This will allow us to assign user created PHBs into it later on. The way
> we initilize the default case is now more in line with that would happen
> with the user created case: the object is created, parented by the chip
> because pnv_xscom_dt() relies on it, and then assigned to the array.
> 
> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
> ---
>   hw/pci-host/pnv_phb.c |  7 +++++++
>   hw/ppc/pnv.c          | 20 +++++++++++++++-----
>   include/hw/ppc/pnv.h  |  6 +++++-
>   3 files changed, 27 insertions(+), 6 deletions(-)
> 
> diff --git a/hw/pci-host/pnv_phb.c b/hw/pci-host/pnv_phb.c
> index 18a050a6d3..40a960c54c 100644
> --- a/hw/pci-host/pnv_phb.c
> +++ b/hw/pci-host/pnv_phb.c
> @@ -90,6 +90,13 @@ static void pnv_phb_user_device_init(PnvPHB *phb)
>       }
>   
>       if (phb->version == 3) {
> +        Pnv8Chip *chip8 = PNV8_CHIP(chip);
> +
> +        phb->chip = chip;
> +
> +        chip8->phbs[chip8->num_phbs] = phb;
> +        chip8->num_phbs++;
> +

I think we need an helper to register a phb in the chip, or a chip class
handler, to isolate the code modifying the chip from a sub chip model.
It would be cleaner.


>           parent = OBJECT(chip);
>       } else {
>           /* phb4 support will be added later */

Specially when you look at the PHB4 version which is very different.
It could return the parent also.

> diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
> index f9e5a3d248..44066ffb8c 100644
> --- a/hw/ppc/pnv.c
> +++ b/hw/ppc/pnv.c
> @@ -661,7 +661,7 @@ static void pnv_chip_power8_pic_print_info(PnvChip *chip, Monitor *mon)
>       ics_pic_print_info(&chip8->psi.ics, mon);
>   
>       for (i = 0; i < chip8->num_phbs; i++) {
> -        PnvPHB *phb = &chip8->phbs[i];
> +        PnvPHB *phb = chip8->phbs[i];
>           PnvPHB3 *phb3 = PNV_PHB3(phb->backend);
>   
>           pnv_phb3_msi_pic_print_info(&phb3->msis, mon);
> @@ -1154,7 +1154,17 @@ static void pnv_chip_power8_instance_init(Object *obj)
>       chip8->num_phbs = pcc->num_phbs;
>   
>       for (i = 0; i < chip8->num_phbs; i++) {
> -        object_initialize_child(obj, "phb[*]", &chip8->phbs[i], TYPE_PNV_PHB);
> +        PnvPHB *phb = PNV_PHB(object_new(TYPE_PNV_PHB));


may be use :

           Object *phb = object_new(TYPE_PNV_PHB);

> +
> +        /*
> +         * We need the chip to parent the PHB to allow the DT
> +         * to build correctly (via pnv_xscom_dt()).
> +         *
> +         * TODO: the PHB should be parented by a PEC device that, at
> +         * this moment, is not modelled powernv8/phb3.
> +         */
> +        object_property_add_child(obj, "phb[*]", OBJECT(phb));
> +        chip8->phbs[i] = phb;

and :
            object_property_add_child(obj, "phb[*]", phb);
            chip8->phbs[i] = PNV_PHB(phb);

This is minor.

C.

>       }
>   
>   }
> @@ -1270,7 +1280,7 @@ static void pnv_chip_power8_realize(DeviceState *dev, Error **errp)
>   
>       /* PHB controllers */
>       for (i = 0; i < chip8->num_phbs; i++) {
> -        PnvPHB *phb = &chip8->phbs[i];
> +        PnvPHB *phb = chip8->phbs[i];
>   
>           object_property_set_int(OBJECT(phb), "index", i, &error_fatal);
>           object_property_set_int(OBJECT(phb), "chip-id", chip->chip_id,
> @@ -1938,7 +1948,7 @@ static ICSState *pnv_ics_get(XICSFabric *xi, int irq)
>           }
>   
>           for (j = 0; j < chip8->num_phbs; j++) {
> -            PnvPHB *phb = &chip8->phbs[j];
> +            PnvPHB *phb = chip8->phbs[j];
>               PnvPHB3 *phb3 = PNV_PHB3(phb->backend);
>   
>               if (ics_valid_irq(&phb3->lsis, irq)) {
> @@ -1977,7 +1987,7 @@ static void pnv_ics_resend(XICSFabric *xi)
>           ics_resend(&chip8->psi.ics);
>   
>           for (j = 0; j < chip8->num_phbs; j++) {
> -            PnvPHB *phb = &chip8->phbs[j];
> +            PnvPHB *phb = chip8->phbs[j];
>               PnvPHB3 *phb3 = PNV_PHB3(phb->backend);
>   
>               ics_resend(&phb3->lsis);
> diff --git a/include/hw/ppc/pnv.h b/include/hw/ppc/pnv.h
> index 033d907287..aea6128e7f 100644
> --- a/include/hw/ppc/pnv.h
> +++ b/include/hw/ppc/pnv.h
> @@ -81,7 +81,11 @@ struct Pnv8Chip {
>       PnvHomer     homer;
>   
>   #define PNV8_CHIP_PHB3_MAX 4
> -    PnvPHB       phbs[PNV8_CHIP_PHB3_MAX];
> +    /*
> +     * The array is used to allow quick access to the phbs by
> +     * pnv_ics_get_child() and pnv_ics_resend_child().
> +     */
> +    PnvPHB       *phbs[PNV8_CHIP_PHB3_MAX];
>       uint32_t     num_phbs;
>   
>       XICSFabric    *xics;

Re: [PATCH for-7.2 v3 07/11] ppc/pnv: add PHB4 helpers for user created pnv-phb

[Cédric Le Goater]

On 8/10/22 12:05, Daniel Henrique Barboza wrote:
> The PHB4 backend relies on a link with the corresponding PEC element.
> This is trivial to do during machine_init() time for default devices,
> but not so much for user created ones.
> 
> pnv_phb4_get_pec() is a small variation of the function that was
> reverted by commit 9c10d86fee "ppc/pnv: Remove user-created PHB{3,4,5}
> devices". We'll use it to determine the appropriate PEC for a given user
> created pnv-phb that uses a PHB4 backend.
> 
> This is done during realize() time, in pnv_phb_user_device_init().
> 
> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
> ---
>   hw/pci-host/pnv_phb.c | 40 ++++++++++++++++++++++++++++++++++++++--
>   1 file changed, 38 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/pci-host/pnv_phb.c b/hw/pci-host/pnv_phb.c
> index 887b25d49e..f9516fdc4a 100644
> --- a/hw/pci-host/pnv_phb.c
> +++ b/hw/pci-host/pnv_phb.c
> @@ -50,6 +50,34 @@ static void pnv_parent_bus_fixup(DeviceState *parent, DeviceState *child)
>       }
>   }
>   
> +static PnvPhb4PecState *pnv_phb4_get_pec(PnvChip *chip, PnvPHB4 *phb,
> +                                         Error **errp)
> +{
> +    Pnv9Chip *chip9 = PNV9_CHIP(chip);
> +    int chip_id = phb->chip_id;
> +    int index = phb->phb_id;
> +    int i, j;
> +
> +    for (i = 0; i < chip->num_pecs; i++) {
> +        /*
> +         * For each PEC, check the amount of phbs it supports
> +         * and see if the given phb4 index matches an index.
> +         */
> +        PnvPhb4PecState *pec = &chip9->pecs[i];
> +
> +        for (j = 0; j < pec->num_phbs; j++) {
> +            if (index == pnv_phb4_pec_get_phb_id(pec, j)) {
> +                return pec;
> +            }
> +        }
> +    }
> +    error_setg(errp,
> +               "pnv-phb4 chip-id %d index %d didn't match any existing PEC",
> +               chip_id, index);
> +
> +    return NULL;
> +}
> +
>   /*
>    * Attach a root port device.
>    *
> @@ -100,8 +128,16 @@ static void pnv_phb_user_device_init(PnvPHB *phb)
>   
>           parent = OBJECT(chip);
>       } else {
> -        /* phb4 support will be added later */
> -        return;
> +        Error *local_err = NULL;
> +
> +        phb->pec = pnv_phb4_get_pec(chip, PNV_PHB4(phb->backend), &local_err);
> +
> +        if (local_err) {
> +            error_propagate(&error_fatal, local_err);

That's weird. pnv_phb_user_device_init() should have an errp parameter I think.

C.

> +            return;
> +        }
> +
> +        parent = OBJECT(phb->pec);
>       }
>   
>       /*

Re: [PATCH for-7.2 v3 06/11] ppc/pnv: enable user created pnv-phb for powernv8

[Cédric Le Goater]

On 8/10/22 12:05, Daniel Henrique Barboza wrote:
> The bulk of the work was already done by previous patches.
> 
> Use defaults_enabled() to determine whether we need to create the
> default devices or not.
> 
> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

Reviewed-by: Cédric Le Goater <clg@kaod.org>

Thanks,

C.

> ---
>   hw/pci-host/pnv_phb.c | 9 +++++++--
>   hw/ppc/pnv.c          | 6 ++++++
>   2 files changed, 13 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/pci-host/pnv_phb.c b/hw/pci-host/pnv_phb.c
> index 40a960c54c..887b25d49e 100644
> --- a/hw/pci-host/pnv_phb.c
> +++ b/hw/pci-host/pnv_phb.c
> @@ -17,6 +17,7 @@
>   #include "hw/ppc/pnv.h"
>   #include "hw/qdev-properties.h"
>   #include "qom/object.h"
> +#include "sysemu/sysemu.h"
>   
>   
>   /*
> @@ -174,6 +175,10 @@ static void pnv_phb_realize(DeviceState *dev, Error **errp)
>           pnv_phb4_bus_init(dev, PNV_PHB4(phb->backend));
>       }
>   
> +    if (phb->version == 3 && !defaults_enabled()) {
> +        return;
> +    }
> +
>       pnv_phb_attach_root_port(pci);
>   }
>   
> @@ -209,7 +214,7 @@ static void pnv_phb_class_init(ObjectClass *klass, void *data)
>       dc->realize = pnv_phb_realize;
>       device_class_set_props(dc, pnv_phb_properties);
>       set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
> -    dc->user_creatable = false;
> +    dc->user_creatable = true;
>   }
>   
>   static void pnv_phb_root_port_reset(DeviceState *dev)
> @@ -300,7 +305,7 @@ static void pnv_phb_root_port_class_init(ObjectClass *klass, void *data)
>       device_class_set_parent_reset(dc, pnv_phb_root_port_reset,
>                                     &rpc->parent_reset);
>       dc->reset = &pnv_phb_root_port_reset;
> -    dc->user_creatable = false;
> +    dc->user_creatable = true;
>   
>       k->vendor_id = PCI_VENDOR_ID_IBM;
>       /* device_id will be written during realize() */
> diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
> index 44066ffb8c..0d3a88578b 100644
> --- a/hw/ppc/pnv.c
> +++ b/hw/ppc/pnv.c
> @@ -1151,6 +1151,10 @@ static void pnv_chip_power8_instance_init(Object *obj)
>   
>       object_initialize_child(obj, "homer", &chip8->homer, TYPE_PNV8_HOMER);
>   
> +    if (!defaults_enabled()) {
> +        return;
> +    }
> +
>       chip8->num_phbs = pcc->num_phbs;
>   
>       for (i = 0; i < chip8->num_phbs; i++) {
> @@ -2103,6 +2107,8 @@ static void pnv_machine_power8_class_init(ObjectClass *oc, void *data)
>   
>       pmc->compat = compat;
>       pmc->compat_size = sizeof(compat);
> +
> +    machine_class_allow_dynamic_sysbus_dev(mc, TYPE_PNV_PHB);
>   }
>   
>   static void pnv_machine_power9_class_init(ObjectClass *oc, void *data)

Re: [PATCH for-7.2 v3 08/11] ppc/pnv: enable user created pnv-phb powernv9

[Cédric Le Goater]

On 8/10/22 12:05, Daniel Henrique Barboza wrote:
> Enable pnv-phb user created devices for powernv9 now that we have
> everything in place.
> 
> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

Reviewed-by: Cédric Le Goater <clg@kaod.org>

Thanks,

C.


> ---
>   hw/pci-host/pnv_phb.c      | 2 +-
>   hw/pci-host/pnv_phb4_pec.c | 6 ++++--
>   hw/ppc/pnv.c               | 2 ++
>   3 files changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/hw/pci-host/pnv_phb.c b/hw/pci-host/pnv_phb.c
> index f9516fdc4a..a142b8ff8d 100644
> --- a/hw/pci-host/pnv_phb.c
> +++ b/hw/pci-host/pnv_phb.c
> @@ -211,7 +211,7 @@ static void pnv_phb_realize(DeviceState *dev, Error **errp)
>           pnv_phb4_bus_init(dev, PNV_PHB4(phb->backend));
>       }
>   
> -    if (phb->version == 3 && !defaults_enabled()) {
> +    if (!defaults_enabled()) {
>           return;
>       }
>   
> diff --git a/hw/pci-host/pnv_phb4_pec.c b/hw/pci-host/pnv_phb4_pec.c
> index 8dc363d69c..9871f462cd 100644
> --- a/hw/pci-host/pnv_phb4_pec.c
> +++ b/hw/pci-host/pnv_phb4_pec.c
> @@ -146,8 +146,10 @@ static void pnv_pec_realize(DeviceState *dev, Error **errp)
>       pec->num_phbs = pecc->num_phbs[pec->index];
>   
>       /* Create PHBs if running with defaults */
> -    for (i = 0; i < pec->num_phbs; i++) {
> -        pnv_pec_default_phb_realize(pec, i, errp);
> +    if (defaults_enabled()) {
> +        for (i = 0; i < pec->num_phbs; i++) {
> +            pnv_pec_default_phb_realize(pec, i, errp);
> +        }
>       }
>   
>       /* Initialize the XSCOM regions for the PEC registers */
> diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
> index 0d3a88578b..b6314dc961 100644
> --- a/hw/ppc/pnv.c
> +++ b/hw/ppc/pnv.c
> @@ -2134,6 +2134,8 @@ static void pnv_machine_power9_class_init(ObjectClass *oc, void *data)
>       pmc->compat = compat;
>       pmc->compat_size = sizeof(compat);
>       pmc->dt_power_mgt = pnv_dt_power_mgt;
> +
> +    machine_class_allow_dynamic_sysbus_dev(mc, TYPE_PNV_PHB);
>   }
>   
>   static void pnv_machine_power10_class_init(ObjectClass *oc, void *data)

Re: [PATCH for-7.2 v3 06/11] ppc/pnv: enable user created pnv-phb for powernv8

[Cédric Le Goater]

On 8/10/22 12:05, Daniel Henrique Barboza wrote:
> The bulk of the work was already done by previous patches.
> 
> Use defaults_enabled() to determine whether we need to create the
> default devices or not.
> 
> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
> ---
>   hw/pci-host/pnv_phb.c | 9 +++++++--
>   hw/ppc/pnv.c          | 6 ++++++
>   2 files changed, 13 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/pci-host/pnv_phb.c b/hw/pci-host/pnv_phb.c
> index 40a960c54c..887b25d49e 100644
> --- a/hw/pci-host/pnv_phb.c
> +++ b/hw/pci-host/pnv_phb.c
> @@ -17,6 +17,7 @@
>   #include "hw/ppc/pnv.h"
>   #include "hw/qdev-properties.h"
>   #include "qom/object.h"
> +#include "sysemu/sysemu.h"
>   
>   
>   /*
> @@ -174,6 +175,10 @@ static void pnv_phb_realize(DeviceState *dev, Error **errp)
>           pnv_phb4_bus_init(dev, PNV_PHB4(phb->backend));
>       }
>   
> +    if (phb->version == 3 && !defaults_enabled()) {
> +        return;
> +    }
> +
>       pnv_phb_attach_root_port(pci);
>   }
>   
> @@ -209,7 +214,7 @@ static void pnv_phb_class_init(ObjectClass *klass, void *data)
>       dc->realize = pnv_phb_realize;
>       device_class_set_props(dc, pnv_phb_properties);
>       set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
> -    dc->user_creatable = false;
> +    dc->user_creatable = true;
>   }
>   
>   static void pnv_phb_root_port_reset(DeviceState *dev)
> @@ -300,7 +305,7 @@ static void pnv_phb_root_port_class_init(ObjectClass *klass, void *data)
>       device_class_set_parent_reset(dc, pnv_phb_root_port_reset,
>                                     &rpc->parent_reset);
>       dc->reset = &pnv_phb_root_port_reset;
> -    dc->user_creatable = false;
> +    dc->user_creatable = true;
>   
>       k->vendor_id = PCI_VENDOR_ID_IBM;
>       /* device_id will be written during realize() */
> diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
> index 44066ffb8c..0d3a88578b 100644
> --- a/hw/ppc/pnv.c
> +++ b/hw/ppc/pnv.c
> @@ -1151,6 +1151,10 @@ static void pnv_chip_power8_instance_init(Object *obj)
>   
>       object_initialize_child(obj, "homer", &chip8->homer, TYPE_PNV8_HOMER);
>   
> +    if (!defaults_enabled()) {
> +        return;
> +    }
> +

May be including the default devices under the 'if' statement would be
better for maintainability :


     if (defaults_enabled()) {
         /* Add defaults */
     }

this is minor.

Thanks,

C.

>       chip8->num_phbs = pcc->num_phbs;
>   
>       for (i = 0; i < chip8->num_phbs; i++) {
> @@ -2103,6 +2107,8 @@ static void pnv_machine_power8_class_init(ObjectClass *oc, void *data)
>   
>       pmc->compat = compat;
>       pmc->compat_size = sizeof(compat);
> +
> +    machine_class_allow_dynamic_sysbus_dev(mc, TYPE_PNV_PHB);
>   }
>   
>   static void pnv_machine_power9_class_init(ObjectClass *oc, void *data)

Re: [PATCH for-7.2 v3 09/11] ppc/pnv: change pnv_phb4_get_pec() to also retrieve chip10->pecs

[Cédric Le Goater]

On 8/10/22 12:05, Daniel Henrique Barboza wrote:
> The function assumes that we're always dealing with a PNV9_CHIP()
> object. This is not the case when the pnv-phb device belongs to a
> powernv10 machine.
> 
> Change pnv_phb4_get_pec() to be able to work with PNV10_CHIP() if
> necessary.
> 
> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
> ---
>   hw/pci-host/pnv_phb.c | 17 +++++++++++++++--
>   1 file changed, 15 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/pci-host/pnv_phb.c b/hw/pci-host/pnv_phb.c
> index a142b8ff8d..feaef8137f 100644
> --- a/hw/pci-host/pnv_phb.c
> +++ b/hw/pci-host/pnv_phb.c
> @@ -53,17 +53,30 @@ static void pnv_parent_bus_fixup(DeviceState *parent, DeviceState *child)
>   static PnvPhb4PecState *pnv_phb4_get_pec(PnvChip *chip, PnvPHB4 *phb,
>                                            Error **errp)
>   {
> -    Pnv9Chip *chip9 = PNV9_CHIP(chip);
> +    PnvPHB *phb_base = phb->phb_base;
> +    PnvPhb4PecState *pecs = NULL;
>       int chip_id = phb->chip_id;
>       int index = phb->phb_id;
>       int i, j;
>   
> +    if (phb_base->version == 4) {
> +        Pnv9Chip *chip9 = PNV9_CHIP(chip);
> +
> +        pecs = chip9->pecs;
> +    } else if (phb_base->version == 5) {
> +        Pnv10Chip *chip10 = PNV10_CHIP(chip);
> +
> +        pecs = chip10->pecs;
> +    } else {

May be :

      g_assert_not_reached();

> +        return NULL;
> +    }
> +
>       for (i = 0; i < chip->num_pecs; i++) {
>           /*
>            * For each PEC, check the amount of phbs it supports
>            * and see if the given phb4 index matches an index.
>            */
> -        PnvPhb4PecState *pec = &chip9->pecs[i];
> +        PnvPhb4PecState *pec = &pecs[i];
>   
>           for (j = 0; j < pec->num_phbs; j++) {
>               if (index == pnv_phb4_pec_get_phb_id(pec, j)) {

Re: [PATCH for-7.2 v3 10/11] ppc/pnv: user creatable pnv-phb for powernv10

[Cédric Le Goater]

On 8/10/22 12:05, Daniel Henrique Barboza wrote:
> Given that powernv9 and powernv10 uses the same pnv-phb backend, the
> logic to allow user created pnv-phbs for powernv10 is already in place.
> Let's flip the switch.
> 
> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

Reviewed-by: Cédric Le Goater <clg@kaod.org>

Thanks,

C.

> ---
>   hw/ppc/pnv.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
> index b6314dc961..02f287feab 100644
> --- a/hw/ppc/pnv.c
> +++ b/hw/ppc/pnv.c
> @@ -2159,6 +2159,8 @@ static void pnv_machine_power10_class_init(ObjectClass *oc, void *data)
>       pmc->dt_power_mgt = pnv_dt_power_mgt;
>   
>       xfc->match_nvt = pnv10_xive_match_nvt;
> +
> +    machine_class_allow_dynamic_sysbus_dev(mc, TYPE_PNV_PHB);
>   }
>   
>   static bool pnv_machine_get_hb(Object *obj, Error **errp)