> -----Original Message----- > From: Jiang Liu [mailto:jiang.liu@xxxxxxxxxxxxxxx] > Sent: Tuesday, October 27, 2015 12:11 AM > To: Jake Oshins <jakeo@xxxxxxxxxxxxx>; gregkh@xxxxxxxxxxxxxxxxxxx; KY > Srinivasan <kys@xxxxxxxxxxxxx>; linux-kernel@xxxxxxxxxxxxxxx; > devel@xxxxxxxxxxxxxxxxxxxxxx; olaf@xxxxxxxxx; apw@xxxxxxxxxxxxx; > vkuznets@xxxxxxxxxx; tglx@xxxxxxxxxxxxx; Haiyang Zhang > <haiyangz@xxxxxxxxxxxxx>; marc.zyngier@xxxxxxx; > bhelgaas@xxxxxxxxxx; linux-pci@xxxxxxxxxxxxxxx > Subject: Re: [PATCH v3 7/7] PCI: hv: New paravirtual PCI front-end for Hyper- > V VMs > > On 2015/10/27 7:15, jakeo@xxxxxxxxxxxxx wrote: > > From: Jake Oshins <jakeo@xxxxxxxxxxxxx> > > (snip) > > +/** > > + * hv_pcie_init_irq_domain() - Initialize IRQ domain > > + * @hbus: The root PCI bus > > + * > > + * Return: '0' on success and error value on failure > > + */ > > +static int hv_pcie_init_irq_domain(struct hv_pcibus_device *hbus) > > +{ > > + hbus->msi_info.chip = &hv_msi_irq_chip; > > + hbus->msi_info.chip_data = hbus; > > + hbus->msi_info.ops = &hv_msi_ops; > > + hbus->msi_info.flags = (MSI_FLAG_USE_DEF_DOM_OPS | > > + MSI_FLAG_USE_DEF_CHIP_OPS | > MSI_FLAG_MULTI_PCI_MSI | > > + MSI_FLAG_PCI_MSIX); > When interrupt remapping is not supported, x86 vector allocator > can't support multiple MSI because it can't allocate continuous > vectors yet. So please confirm whether we could enable > MSI_FLAG_MULTI_PCI_MSI for HV. > We can actually handle the remapping in the hypervisor. I'll add a comment to that effect. > > + hbus->msi_info.handler = handle_edge_irq; > > + hbus->msi_info.handler_name = "edge"; > > + hbus->msi_info.data = hbus; > How about using following pattern so we could avoid exporting > too many interfaces? > > struct irq_domain *parent_domain = NULL; > hbus->msi_info.chip = &hv_msi_irq_chip; > hbus->msi_info.ops = &hv_msi_ops; > // Let arch code to fill in default ops for chip and domain > x86_setup_default_msi_irqdomian_info(&hbus->msi_info, > &parent_domain); > // Override default ops if not applicable > hbus->irq_domain = pci_msi_create_irq_domain(hbus->fwnode, > &hbus->msi_info, > parent_domain); > I understand your point here, but I'm having trouble making it play out. When I look at this, the only functions or structures which are supplied straight from exports (in my proposed patches) are irq_chip_ack_parent(), pci_msi_prepare() and x86_vector_domain. The other exports either already exist for other reasons or they're needed within functions that I need to supply. If you feel strongly that adding a new function to avoid exporting these is the right way to go, I'll do it, but I want to confirm that first. Thanks, Jake Oshins -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
