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| From: | Daniel Henrique Barboza |
| Subject: | Re: [PATCH v2 04/16] ppc/pnv: change PnvPHB3 to be a PnvPHB backend |
| Date: | Fri, 3 Jun 2022 17:30:24 -0300 |
| User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.10.0 |
On 6/2/22 04:56, Mark Cave-Ayland wrote:
On 31/05/2022 22:49, Daniel Henrique Barboza wrote:We need a handful of changes that needs to be done in a single swoop to turn PnvPHB3 into a PnvPHB backend. In the PnvPHB3, since the PnvPHB device implements PCIExpressHost and will hold the PCI bus, change PnvPHB3 parent to TYPE_DEVICE. There are a couple of instances in pnv_phb3.c that needs to access the PCI bus, so a phb_base pointer is added to allow access to the parent PnvPHB. The PnvPHB3 root port will now be connected to a PnvPHB object. In pnv.c, the powernv8 machine chip8 will now hold an array of PnvPHB objects. pnv_get_phb3_child() needs to be adapted to return the PnvPHB3 backend from the PnvPHB child. A global property is added in pnv_machine_power8_class_init() to ensure that all PnvPHBs are created with phb->version = 3. After all these changes we're still able to boot a powernv8 machine with default settings. The real gain will come with user created PnvPHB devices, coming up next. Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> --- hw/pci-host/pnv_phb3.c | 29 ++++++++--------------------- hw/ppc/pnv.c | 21 +++++++++++++++++---- include/hw/pci-host/pnv_phb3.h | 5 ++++- include/hw/ppc/pnv.h | 3 ++- 4 files changed, 31 insertions(+), 27 deletions(-) diff --git a/hw/pci-host/pnv_phb3.c b/hw/pci-host/pnv_phb3.c index 60584e2aae..a39aa0e8c4 100644 --- a/hw/pci-host/pnv_phb3.c +++ b/hw/pci-host/pnv_phb3.c @@ -11,6 +11,7 @@ #include "qapi/visitor.h" #include "qapi/error.h" #include "hw/pci-host/pnv_phb3_regs.h" +#include "hw/pci-host/pnv_phb.h" #include "hw/pci-host/pnv_phb3.h" #include "hw/pci/pcie_host.h" #include "hw/pci/pcie_port.h" @@ -26,7 +27,7 @@ static PCIDevice *pnv_phb3_find_cfg_dev(PnvPHB3 *phb) { - PCIHostState *pci = PCI_HOST_BRIDGE(phb); + PCIHostState *pci = PCI_HOST_BRIDGE(phb->phb_base); uint64_t addr = phb->regs[PHB_CONFIG_ADDRESS >> 3]; uint8_t bus, devfn; @@ -590,7 +591,7 @@ void pnv_phb3_reg_write(void *opaque, hwaddr off, uint64_t val, unsigned size) uint64_t pnv_phb3_reg_read(void *opaque, hwaddr off, unsigned size) { PnvPHB3 *phb = opaque; - PCIHostState *pci = PCI_HOST_BRIDGE(phb); + PCIHostState *pci = PCI_HOST_BRIDGE(phb->phb_base); uint64_t val; if ((off & 0xfffc) == PHB_CONFIG_DATA) { @@ -1057,8 +1058,6 @@ static void pnv_phb3_realize(DeviceState *dev, Error **errp) "phb3-regs", 0x1000); pnv_phb3_bus_init(dev, phb); - - pnv_phb_attach_root_port(PCI_HOST_BRIDGE(phb), TYPE_PNV_PHB3_ROOT_PORT); } void pnv_phb3_update_regions(PnvPHB3 *phb) @@ -1083,38 +1082,26 @@ void pnv_phb3_update_regions(PnvPHB3 *phb) pnv_phb3_check_all_m64s(phb); } -static const char *pnv_phb3_root_bus_path(PCIHostState *host_bridge, - PCIBus *rootbus) -{ - PnvPHB3 *phb = PNV_PHB3(host_bridge); - - snprintf(phb->bus_path, sizeof(phb->bus_path), "00%02x:%02x", - phb->chip_id, phb->phb_id); - return phb->bus_path; -} - static Property pnv_phb3_properties[] = { DEFINE_PROP_UINT32("index", PnvPHB3, phb_id, 0), DEFINE_PROP_UINT32("chip-id", PnvPHB3, chip_id, 0), DEFINE_PROP_LINK("chip", PnvPHB3, chip, TYPE_PNV_CHIP, PnvChip *), + DEFINE_PROP_LINK("phb-base", PnvPHB3, phb_base, TYPE_PNV_PHB, PnvPHB *), DEFINE_PROP_END_OF_LIST(), }; static void pnv_phb3_class_init(ObjectClass *klass, void *data) { - PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass); DeviceClass *dc = DEVICE_CLASS(klass); - hc->root_bus_path = pnv_phb3_root_bus_path; dc->realize = pnv_phb3_realize; device_class_set_props(dc, pnv_phb3_properties); - set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); dc->user_creatable = false; } static const TypeInfo pnv_phb3_type_info = { .name = TYPE_PNV_PHB3, - .parent = TYPE_PCIE_HOST_BRIDGE, + .parent = TYPE_DEVICE, .instance_size = sizeof(PnvPHB3), .class_init = pnv_phb3_class_init, .instance_init = pnv_phb3_instance_init, @@ -1146,11 +1133,11 @@ static void pnv_phb3_root_port_realize(DeviceState *dev, Error **errp) PCIERootPortClass *rpc = PCIE_ROOT_PORT_GET_CLASS(dev); PCIDevice *pci = PCI_DEVICE(dev); PCIBus *bus = pci_get_bus(pci); - PnvPHB3 *phb = NULL; + PnvPHB *phb = NULL; Error *local_err = NULL; - phb = (PnvPHB3 *) object_dynamic_cast(OBJECT(bus->qbus.parent), - TYPE_PNV_PHB3); + phb = (PnvPHB *) object_dynamic_cast(OBJECT(bus->qbus.parent), + TYPE_PNV_PHB);I realize that this has come from existing code, however these days there generally isn't a good reason for anything to access bus->qbus directly (and C casts without a QOM macro often need a closer look). I'm also not convinced by the use of object_dynamic_cast() here either. Could this be rewritten as something like: phb = PNV_PHB(PNV_PHB3_ROOT_PORT(dev)->phb_base);
Just checked. At this moment we can't because we don't declare a PNV_PHB3_ROOT_PORT() macro for this device. Yes, we're missing a OBJECT_DECLARE_SIMPLE_TYPE() for it. Same thing for PnvPHB4RootPort. I can add the missing PNV_PHB3_ROOT_PORT() macro and do this change. Or I can make a comment mentioning that this code can be improved but it's going to be removed shortly and this will be amended appropriately in the pnv-phb-root-port code. What do you think? I'm fine with both alternatives. Thanks, Daniel
if (!phb) { error_setg(errp, diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c index aaf4d241c3..6cd0af9adf 100644 --- a/hw/ppc/pnv.c +++ b/hw/ppc/pnv.c @@ -43,6 +43,7 @@ #include "hw/ipmi/ipmi.h" #include "target/ppc/mmu-hash64.h" #include "hw/pci/msi.h" +#include "hw/pci-host/pnv_phb.h" #include "hw/ppc/xics.h" #include "hw/qdev-properties.h" @@ -654,7 +655,13 @@ static ISABus *pnv_isa_create(PnvChip *chip, Error **errp) static PnvPHB3 *pnv_get_phb3_child(Object *child) { - return (PnvPHB3 *)object_dynamic_cast(child, TYPE_PNV_PHB3); + PnvPHB *phb = (PnvPHB *) object_dynamic_cast(child, TYPE_PNV_PHB);And here, assuming child is of type TYPE_PNV_PHB then as it is already known at compile time so I think this could become just: PnvPHB *phb = PNV_PHB(child);+ if (!phb) { + return NULL; + } + + return (PnvPHB3 *)phb->backend; } static int pnv_chip_power8_pic_print_info_child(Object *child, void *opaque) @@ -1160,7 +1167,7 @@ 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_PHB3); + object_initialize_child(obj, "phb[*]", &chip8->phbs[i], TYPE_PNV_PHB); } } @@ -1282,9 +1289,9 @@ static void pnv_chip_power8_realize(DeviceState *dev, Error **errp) memory_region_add_subregion(get_system_memory(), PNV_HOMER_BASE(chip), &chip8->homer.regs); - /* PHB3 controllers */ + /* PHB controllers */ for (i = 0; i < chip8->num_phbs; i++) { - PnvPHB3 *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, @@ -1957,6 +1964,7 @@ static int pnv_ics_get_child(Object *child, void *opaque) args->ics = ICS(&phb3->msis); } } + return args->ics ? 1 : 0; } @@ -2112,8 +2120,13 @@ static void pnv_machine_power8_class_init(ObjectClass *oc, void *data) PnvMachineClass *pmc = PNV_MACHINE_CLASS(oc); static const char compat[] = "qemu,powernv8\0qemu,powernv\0ibm,powernv"; + static GlobalProperty phb_compat[] = { + { TYPE_PNV_PHB, "version", "3" }, + }; + mc->desc = "IBM PowerNV (Non-Virtualized) POWER8"; mc->default_cpu_type = POWERPC_CPU_TYPE_NAME("power8_v2.0"); + compat_props_add(mc->compat_props, phb_compat, G_N_ELEMENTS(phb_compat)); xic->icp_get = pnv_icp_get; xic->ics_get = pnv_ics_get; diff --git a/include/hw/pci-host/pnv_phb3.h b/include/hw/pci-host/pnv_phb3.h index 1375f18fc1..3b9ff1096a 100644 --- a/include/hw/pci-host/pnv_phb3.h +++ b/include/hw/pci-host/pnv_phb3.h @@ -14,6 +14,7 @@ #include "hw/pci/pcie_port.h" #include "hw/ppc/xics.h" #include "qom/object.h" +#include "hw/pci-host/pnv_phb.h" typedef struct PnvPHB3 PnvPHB3; typedef struct PnvChip PnvChip; @@ -127,7 +128,9 @@ OBJECT_DECLARE_SIMPLE_TYPE(PnvPHB3, PNV_PHB3) #define PCI_MMIO_TOTAL_SIZE (0x1ull << 60) struct PnvPHB3 { - PCIExpressHost parent_obj; + DeviceState parent; + + PnvPHB *phb_base; uint32_t chip_id; uint32_t phb_id; diff --git a/include/hw/ppc/pnv.h b/include/hw/ppc/pnv.h index 86cb7d7f97..4595db418e 100644 --- a/include/hw/ppc/pnv.h +++ b/include/hw/ppc/pnv.h @@ -32,6 +32,7 @@ #include "hw/ppc/pnv_core.h" #include "hw/pci-host/pnv_phb3.h" #include "hw/pci-host/pnv_phb4.h" +#include "hw/pci-host/pnv_phb.h" #include "qom/object.h" #define TYPE_PNV_CHIP "pnv-chip" @@ -80,7 +81,7 @@ struct Pnv8Chip { PnvHomer homer; #define PNV8_CHIP_PHB3_MAX 4 - PnvPHB3 phbs[PNV8_CHIP_PHB3_MAX]; + PnvPHB phbs[PNV8_CHIP_PHB3_MAX]; uint32_t num_phbs; XICSFabric *xics;ATB, Mark.
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