Commit dd27a707 authored by Reinette Chatre's avatar Reinette Chatre Committed by Alex Williamson
Browse files

vfio/pci: Probe and store ability to support dynamic MSI-X 



Not all MSI-X devices support dynamic MSI-X allocation. Whether
a device supports dynamic MSI-X should be queried using
pci_msix_can_alloc_dyn().

Instead of scattering code with pci_msix_can_alloc_dyn(),
probe this ability once and store it as a property of the
virtual device.

Suggested-by: default avatarAlex Williamson <alex.williamson@redhat.com>
Signed-off-by: default avatarReinette Chatre <reinette.chatre@intel.com>
Reviewed-by: default avatarKevin Tian <kevin.tian@intel.com>
Acked-by: default avatarThomas Gleixner <tglx@linutronix.de>
Reviewed-by: default avatarJason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/f1ae022c060ecb7e527f4f53c8ccafe80768da47.1683740667.git.reinette.chatre@intel.com


Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
parent 9cd0f6d5

drivers/vfio/pci/vfio_pci_core.c

+4 −1
Original line number Diff line number Diff line
@@ -530,8 +530,11 @@ int vfio_pci_core_enable(struct vfio_pci_core_device *vdev) 
		vdev->msix_bar = table & PCI_MSIX_TABLE_BIR;

		vdev->msix_offset = table & PCI_MSIX_TABLE_OFFSET;

		vdev->msix_size = ((flags & PCI_MSIX_FLAGS_QSIZE) + 1) * 16;

	} else

		vdev->has_dyn_msix = pci_msix_can_alloc_dyn(pdev);

	} else {

		vdev->msix_bar = 0xFF;

		vdev->has_dyn_msix = false;

	}



	if (!vfio_vga_disabled() && vfio_pci_is_vga(pdev))

		vdev->has_vga = true;

include/linux/vfio_pci_core.h

+1 −0
Original line number Diff line number Diff line
@@ -68,6 +68,7 @@ struct vfio_pci_core_device { 
	u16			msix_size;

	u32			msix_offset;

	u32			rbar[7];

	bool			has_dyn_msix:1;

	bool			pci_2_3:1;

	bool			virq_disabled:1;

	bool			reset_works:1;