Commit ad518f25 authored by Shradha Gupta's avatar Shradha Gupta
Browse files

PCI: hv: Allow dynamic MSI-X vector allocation 



Allow dynamic MSI-X vector allocation for pci_hyperv PCI controller
by adding support for the flag MSI_FLAG_PCI_MSIX_ALLOC_DYN and using
pci_msix_prepare_desc() to prepare the MSI-X descriptors.

Feature support added for both x86 and ARM64

Signed-off-by: default avatarShradha Gupta <shradhagupta@linux.microsoft.com>
Reviewed-by: default avatarHaiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: default avatarSaurabh Sengar <ssengar@linux.microsoft.com>
Acked-by: default avatarBjorn Helgaas <bhelgaas@google.com>
parent 5da8a8b8

drivers/pci/controller/pci-hyperv.c

+2 −1
Original line number Diff line number Diff line
@@ -2119,6 +2119,7 @@ static struct irq_chip hv_msi_irq_chip = { 
static struct msi_domain_ops hv_msi_ops = {

	.msi_prepare	= hv_msi_prepare,

	.msi_free	= hv_msi_free,

	.prepare_desc	= pci_msix_prepare_desc,

};



/**
@@ -2140,7 +2141,7 @@ static int hv_pcie_init_irq_domain(struct hv_pcibus_device *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);

		MSI_FLAG_PCI_MSIX | MSI_FLAG_PCI_MSIX_ALLOC_DYN);

	hbus->msi_info.handler = FLOW_HANDLER;

	hbus->msi_info.handler_name = FLOW_NAME;

	hbus->msi_info.data = hbus;