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From: | Daniel Henrique Barboza |
Subject: | Re: [PATCH v3 01/12] ppc/pnv: add PHB3 bus init helper |
Date: | Mon, 27 Jun 2022 14:09:34 -0300 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.10.0 |
On 6/24/22 10:44, Cédric Le Goater wrote:
(Adding people who could help making the right change) On 6/24/22 10:49, Daniel Henrique Barboza wrote:The PnvPHB3 bus init consists of initializing the pci_io and pci_mmio regions, registering it via pci_register_root_bus() and then setup the iommu. We'll want to init the bus from outside pnv_phb3.c when the bus is removed from the PnvPHB3 device and put into a new parent PnvPHB device. The new pnv_phb3_bus_init() helper will be used by the parent to init the bus when using the PHB3 backend. Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> --- hw/pci-host/pnv_phb3.c | 39 ++++++++++++++++++++-------------- include/hw/pci-host/pnv_phb3.h | 1 + 2 files changed, 24 insertions(+), 16 deletions(-) diff --git a/hw/pci-host/pnv_phb3.c b/hw/pci-host/pnv_phb3.c index d58d3c1701..058cbab555 100644 --- a/hw/pci-host/pnv_phb3.c +++ b/hw/pci-host/pnv_phb3.c @@ -986,6 +986,28 @@ static void pnv_phb3_instance_init(Object *obj) } +void pnv_phb3_bus_init(DeviceState *dev, PnvPHB3 *phb) +{ + PCIHostState *pci = PCI_HOST_BRIDGE(dev); + + /* + * PHB3 doesn't support IO space. However, qemu gets very upset if + * we don't have an IO region to anchor IO BARs onto so we just + * initialize one which we never hook up to anything + */ + memory_region_init(&phb->pci_io, OBJECT(phb), "pci-io", 0x10000); + memory_region_init(&phb->pci_mmio, OBJECT(phb), "pci-mmio", + PCI_MMIO_TOTAL_SIZE);Could we change the root port settings with io-reserve=0 to remove the IO range ?
I don't think so, and I think this is what the comment right before refers to. Even with io-reserve=0 I can't remove phb->pci_io. The code breaks in the middle of the root port realize core code, pci_bridge_initfn(), when trying to create the bridge windows via br->windows = pci_bridge_region_init(br); There's no verification of io-reserve value (via res_reserve.io) influencing the init of those regions. What I can see related to io-reserve, for example, is this piece of code from gen_rp_realize() in gen_pcie_root_port.c: if (!grp->res_reserve.io) { pci_word_test_and_clear_mask(d->wmask + PCI_COMMAND, PCI_COMMAND_IO); d->wmask[PCI_IO_BASE] = 0; d->wmask[PCI_IO_LIMIT] = 0; } Of course that this piece of code does nothing to avoid the segfault described below. I think this might be worth a investigation later on as a follow up. For now I'd like to focus on pnv-phb changes (including the user created support) before the freeze. Thanks, Daniel
Thanks, C.+ pci->bus = pci_register_root_bus(dev, + dev->id ? dev->id : NULL, + pnv_phb3_set_irq, pnv_phb3_map_irq, phb, + &phb->pci_mmio, &phb->pci_io, + 0, 4, TYPE_PNV_PHB3_ROOT_BUS); + + pci_setup_iommu(pci->bus, pnv_phb3_dma_iommu, phb); +} + static void pnv_phb3_realize(DeviceState *dev, Error **errp) { PnvPHB3 *phb = PNV_PHB3(dev); @@ -1035,22 +1057,7 @@ static void pnv_phb3_realize(DeviceState *dev, Error **errp) memory_region_init_io(&phb->mr_regs, OBJECT(phb), &pnv_phb3_reg_ops, phb, "phb3-regs", 0x1000); - /* - * PHB3 doesn't support IO space. However, qemu gets very upset if - * we don't have an IO region to anchor IO BARs onto so we just - * initialize one which we never hook up to anything - */ - memory_region_init(&phb->pci_io, OBJECT(phb), "pci-io", 0x10000); - memory_region_init(&phb->pci_mmio, OBJECT(phb), "pci-mmio", - PCI_MMIO_TOTAL_SIZE); - - pci->bus = pci_register_root_bus(dev, - dev->id ? dev->id : NULL, - pnv_phb3_set_irq, pnv_phb3_map_irq, phb, - &phb->pci_mmio, &phb->pci_io, - 0, 4, TYPE_PNV_PHB3_ROOT_BUS); - - pci_setup_iommu(pci->bus, pnv_phb3_dma_iommu, phb); + pnv_phb3_bus_init(dev, phb); pnv_phb_attach_root_port(pci, TYPE_PNV_PHB3_ROOT_PORT, phb->phb_id, phb->chip_id); diff --git a/include/hw/pci-host/pnv_phb3.h b/include/hw/pci-host/pnv_phb3.h index af6ec83cf6..1375f18fc1 100644 --- a/include/hw/pci-host/pnv_phb3.h +++ b/include/hw/pci-host/pnv_phb3.h @@ -164,5 +164,6 @@ uint64_t pnv_phb3_reg_read(void *opaque, hwaddr off, unsigned size); void pnv_phb3_reg_write(void *opaque, hwaddr off, uint64_t val, unsigned size); void pnv_phb3_update_regions(PnvPHB3 *phb); void pnv_phb3_remap_irqs(PnvPHB3 *phb); +void pnv_phb3_bus_init(DeviceState *dev, PnvPHB3 *phb); #endif /* PCI_HOST_PNV_PHB3_H */
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