From 9c10d86fee11d96274ea6f7cda12d2471abe3c47 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= Date: Mon, 14 Mar 2022 15:57:17 +0100 Subject: [PATCH] ppc/pnv: Remove user-created PHB{3,4,5} devices MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On a real system with POWER{8,9,10} processors, PHBs are sub-units of the processor, they can be deactivated by firmware but not plugged in or out like a PCI adapter on a slot. Nevertheless, having user-created PHBs in QEMU seemed to be a good idea for testing purposes : 1. having a limited set of PHBs speedups boot time. 2. it is useful to be able to mimic a partially broken topology you some time have to deal with during bring-up. PowerNV is also used for distro install tests and having libvirt support eases these tasks. libvirt prefers to run the machine with -nodefaults to be sure not to drag unexpected devices which would need to be defined in the domain file without being specified on the QEMU command line. For this reason : 3. -nodefaults should not include default PHBs User-created PHB{3,4,5} devices satisfied all these needs but reality proves to be a bit more complex, internally when modeling such devices, and externally when dealing with the user interface. Req 1. and 2. can be simply addressed differently with a machine option: "phb-mask=", which QEMU would use to enable/disable PHB device nodes when creating the device tree. For Req 3., we need to make sure we are taking the right approach. It seems that we should expose a new type of user-created PHB device, a generic virtualized one, that libvirt would use and not one depending on the processor revision. This needs more thinking. For now, remove user-created PHB{3,4,5} devices. All the cleanups we did are not lost and they will be useful for the next steps. Fixes: 5bc67b052b51 ("ppc/pnv: Introduce user creatable pnv-phb4 devices") Fixes: 1f6a88fffc75 ("ppc/pnv: Introduce support for user created PHB3 devices") Reviewed-by: Daniel Henrique Barboza Reviewed-by: Frederic Barrat Signed-off-by: Cédric Le Goater Message-Id: <20220314130514.529931-1-clg@kaod.org> Signed-off-by: Cédric Le Goater --- hw/pci-host/pnv_phb3.c | 33 ++------------------ hw/pci-host/pnv_phb4.c | 62 ++------------------------------------ hw/pci-host/pnv_phb4_pec.c | 7 ++--- hw/ppc/pnv.c | 25 +-------------- include/hw/ppc/pnv.h | 1 - 5 files changed, 10 insertions(+), 118 deletions(-) diff --git a/hw/pci-host/pnv_phb3.c b/hw/pci-host/pnv_phb3.c index aafd46b635..ac801ac835 100644 --- a/hw/pci-host/pnv_phb3.c +++ b/hw/pci-host/pnv_phb3.c @@ -994,30 +994,6 @@ static void pnv_phb3_realize(DeviceState *dev, Error **errp) PnvMachineState *pnv = PNV_MACHINE(qdev_get_machine()); int i; - /* User created devices */ - if (!phb->chip) { - Error *local_err = NULL; - BusState *s; - - phb->chip = pnv_get_chip(pnv, phb->chip_id); - if (!phb->chip) { - error_setg(errp, "invalid chip id: %d", phb->chip_id); - return; - } - - /* - * Reparent user created devices to the chip to build - * correctly the device tree. - */ - pnv_chip_parent_fixup(phb->chip, OBJECT(phb), phb->phb_id); - - s = qdev_get_parent_bus(DEVICE(phb->chip)); - if (!qdev_set_parent_bus(DEVICE(phb), s, &local_err)) { - error_propagate(errp, local_err); - return; - } - } - if (phb->phb_id >= PNV_CHIP_GET_CLASS(phb->chip)->num_phbs) { error_setg(errp, "invalid PHB index: %d", phb->phb_id); return; @@ -1077,10 +1053,7 @@ static void pnv_phb3_realize(DeviceState *dev, Error **errp) pci_setup_iommu(pci->bus, pnv_phb3_dma_iommu, phb); - if (defaults_enabled()) { - pnv_phb_attach_root_port(PCI_HOST_BRIDGE(phb), - TYPE_PNV_PHB3_ROOT_PORT); - } + pnv_phb_attach_root_port(PCI_HOST_BRIDGE(phb), TYPE_PNV_PHB3_ROOT_PORT); } void pnv_phb3_update_regions(PnvPHB3 *phb) @@ -1131,7 +1104,7 @@ static void pnv_phb3_class_init(ObjectClass *klass, void *data) dc->realize = pnv_phb3_realize; device_class_set_props(dc, pnv_phb3_properties); set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); - dc->user_creatable = true; + dc->user_creatable = false; } static const TypeInfo pnv_phb3_type_info = { @@ -1201,7 +1174,7 @@ static void pnv_phb3_root_port_class_init(ObjectClass *klass, void *data) device_class_set_parent_realize(dc, pnv_phb3_root_port_realize, &rpc->parent_realize); - dc->user_creatable = true; + dc->user_creatable = false; k->vendor_id = PCI_VENDOR_ID_IBM; k->device_id = 0x03dc; diff --git a/hw/pci-host/pnv_phb4.c b/hw/pci-host/pnv_phb4.c index d1a911f988..b301762093 100644 --- a/hw/pci-host/pnv_phb4.c +++ b/hw/pci-host/pnv_phb4.c @@ -1545,70 +1545,14 @@ static void pnv_phb4_instance_init(Object *obj) object_initialize_child(obj, "source", &phb->xsrc, TYPE_XIVE_SOURCE); } -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; -} - static void pnv_phb4_realize(DeviceState *dev, Error **errp) { PnvPHB4 *phb = PNV_PHB4(dev); - PnvMachineState *pnv = PNV_MACHINE(qdev_get_machine()); - PnvChip *chip = pnv_get_chip(pnv, phb->chip_id); PCIHostState *pci = PCI_HOST_BRIDGE(dev); XiveSource *xsrc = &phb->xsrc; - BusState *s; - Error *local_err = NULL; int nr_irqs; char name[32]; - if (!chip) { - error_setg(errp, "invalid chip id: %d", phb->chip_id); - return; - } - - /* User created PHBs need to be assigned to a PEC */ - if (!phb->pec) { - phb->pec = pnv_phb4_get_pec(chip, phb, &local_err); - if (local_err) { - error_propagate(errp, local_err); - return; - } - } - - /* Reparent the PHB to the chip to build the device tree */ - pnv_chip_parent_fixup(chip, OBJECT(phb), phb->phb_id); - - s = qdev_get_parent_bus(DEVICE(chip)); - if (!qdev_set_parent_bus(DEVICE(phb), s, &local_err)) { - error_propagate(errp, local_err); - return; - } - /* Set the "big_phb" flag */ phb->big_phb = phb->phb_id == 0 || phb->phb_id == 3; @@ -1766,7 +1710,7 @@ static void pnv_phb4_class_init(ObjectClass *klass, void *data) dc->realize = pnv_phb4_realize; device_class_set_props(dc, pnv_phb4_properties); set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); - dc->user_creatable = true; + dc->user_creatable = false; xfc->notify = pnv_phb4_xive_notify; } @@ -1864,7 +1808,7 @@ static void pnv_phb4_root_port_class_init(ObjectClass *klass, void *data) PCIERootPortClass *rpc = PCIE_ROOT_PORT_CLASS(klass); dc->desc = "IBM PHB4 PCIE Root Port"; - dc->user_creatable = true; + dc->user_creatable = false; device_class_set_parent_realize(dc, pnv_phb4_root_port_realize, &rpc->parent_realize); @@ -1894,7 +1838,7 @@ static void pnv_phb5_root_port_class_init(ObjectClass *klass, void *data) PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); dc->desc = "IBM PHB5 PCIE Root Port"; - dc->user_creatable = true; + dc->user_creatable = false; k->vendor_id = PCI_VENDOR_ID_IBM; k->device_id = PNV_PHB5_DEVICE_ID; diff --git a/hw/pci-host/pnv_phb4_pec.c b/hw/pci-host/pnv_phb4_pec.c index a0dfa77c84..6f1121a948 100644 --- a/hw/pci-host/pnv_phb4_pec.c +++ b/hw/pci-host/pnv_phb4_pec.c @@ -120,6 +120,7 @@ static void pnv_pec_default_phb_realize(PnvPhb4PecState *pec, PnvPHB4 *phb = PNV_PHB4(qdev_new(pecc->phb_type)); int phb_id = pnv_phb4_pec_get_phb_id(pec, stack_no); + object_property_add_child(OBJECT(pec), "phb[*]", OBJECT(phb)); object_property_set_link(OBJECT(phb), "pec", OBJECT(pec), &error_abort); object_property_set_int(OBJECT(phb), "chip-id", pec->chip_id, @@ -150,10 +151,8 @@ static void pnv_pec_realize(DeviceState *dev, Error **errp) pec->num_phbs = pecc->num_phbs[pec->index]; /* Create PHBs if running with defaults */ - if (defaults_enabled()) { - for (i = 0; i < pec->num_phbs; i++) { - pnv_pec_default_phb_realize(pec, i, errp); - } + 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 e7cd8b62ca..00f57c9678 100644 --- a/hw/ppc/pnv.c +++ b/hw/ppc/pnv.c @@ -1141,9 +1141,7 @@ static void pnv_chip_power8_instance_init(Object *obj) object_initialize_child(obj, "homer", &chip8->homer, TYPE_PNV8_HOMER); - if (defaults_enabled()) { - chip8->num_phbs = pcc->num_phbs; - } + 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); @@ -1974,23 +1972,6 @@ static ICSState *pnv_ics_get(XICSFabric *xi, int irq) return NULL; } -void pnv_chip_parent_fixup(PnvChip *chip, Object *obj, int index) -{ - Object *parent = OBJECT(chip); - g_autofree char *default_id = - g_strdup_printf("%s[%d]", object_get_typename(obj), index); - - if (obj->parent == parent) { - return; - } - - object_ref(obj); - object_unparent(obj); - object_property_add_child( - parent, DEVICE(obj)->id ? DEVICE(obj)->id : default_id, obj); - object_unref(obj); -} - PnvChip *pnv_get_chip(PnvMachineState *pnv, uint32_t chip_id) { int i; @@ -2130,8 +2111,6 @@ 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_PHB3); } static void pnv_machine_power9_class_init(ObjectClass *oc, void *data) @@ -2150,8 +2129,6 @@ 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_PHB4); } static void pnv_machine_power10_class_init(ObjectClass *oc, void *data) diff --git a/include/hw/ppc/pnv.h b/include/hw/ppc/pnv.h index 1e34ddd502..86cb7d7f97 100644 --- a/include/hw/ppc/pnv.h +++ b/include/hw/ppc/pnv.h @@ -190,7 +190,6 @@ DECLARE_INSTANCE_CHECKER(PnvChip, PNV_CHIP_POWER10, PowerPCCPU *pnv_chip_find_cpu(PnvChip *chip, uint32_t pir); void pnv_phb_attach_root_port(PCIHostState *pci, const char *name); -void pnv_chip_parent_fixup(PnvChip *chip, Object *obj, int index); #define TYPE_PNV_MACHINE MACHINE_TYPE_NAME("powernv") typedef struct PnvMachineClass PnvMachineClass;