diff options
| author | Alex Williamson <alex.williamson@redhat.com> | 2023-05-19 15:47:48 -0600 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2023-06-16 12:22:18 -0600 |
| commit | a5bfe22db2a4a1ae467f31cfa1d72043eb9f1877 (patch) | |
| tree | 04c8a04ce7342bef61fddebc053316391c763281 /drivers/vfio | |
| parent | d9824f70e52c736498c9177688cee5aa789e560c (diff) | |
| download | linux-a5bfe22db2a4a1ae467f31cfa1d72043eb9f1877.tar.gz | |
vfio/pci-core: Add capability for AtomicOp completer support
Test and enable PCIe AtomicOp completer support of various widths and
report via device-info capability to userspace.
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Robin Voetter <robin@streamhpc.com>
Tested-by: Robin Voetter <robin@streamhpc.com>
Link: https://lore.kernel.org/r/20230519214748.402003-1-alex.williamson@redhat.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/vfio')
| -rw-r--r-- | drivers/vfio/pci/vfio_pci_core.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c index ec7e662de033d..20d7b69ea6ff1 100644 --- a/drivers/vfio/pci/vfio_pci_core.c +++ b/drivers/vfio/pci/vfio_pci_core.c @@ -885,6 +885,37 @@ int vfio_pci_core_register_dev_region(struct vfio_pci_core_device *vdev, } EXPORT_SYMBOL_GPL(vfio_pci_core_register_dev_region); +static int vfio_pci_info_atomic_cap(struct vfio_pci_core_device *vdev, + struct vfio_info_cap *caps) +{ + struct vfio_device_info_cap_pci_atomic_comp cap = { + .header.id = VFIO_DEVICE_INFO_CAP_PCI_ATOMIC_COMP, + .header.version = 1 + }; + struct pci_dev *pdev = pci_physfn(vdev->pdev); + u32 devcap2; + + pcie_capability_read_dword(pdev, PCI_EXP_DEVCAP2, &devcap2); + + if ((devcap2 & PCI_EXP_DEVCAP2_ATOMIC_COMP32) && + !pci_enable_atomic_ops_to_root(pdev, PCI_EXP_DEVCAP2_ATOMIC_COMP32)) + cap.flags |= VFIO_PCI_ATOMIC_COMP32; + + if ((devcap2 & PCI_EXP_DEVCAP2_ATOMIC_COMP64) && + !pci_enable_atomic_ops_to_root(pdev, PCI_EXP_DEVCAP2_ATOMIC_COMP64)) + cap.flags |= VFIO_PCI_ATOMIC_COMP64; + + if ((devcap2 & PCI_EXP_DEVCAP2_ATOMIC_COMP128) && + !pci_enable_atomic_ops_to_root(pdev, + PCI_EXP_DEVCAP2_ATOMIC_COMP128)) + cap.flags |= VFIO_PCI_ATOMIC_COMP128; + + if (!cap.flags) + return -ENODEV; + + return vfio_info_add_capability(caps, &cap.header, sizeof(cap)); +} + static int vfio_pci_ioctl_get_info(struct vfio_pci_core_device *vdev, struct vfio_device_info __user *arg) { @@ -923,6 +954,13 @@ static int vfio_pci_ioctl_get_info(struct vfio_pci_core_device *vdev, return ret; } + ret = vfio_pci_info_atomic_cap(vdev, &caps); + if (ret && ret != -ENODEV) { + pci_warn(vdev->pdev, + "Failed to setup AtomicOps info capability\n"); + return ret; + } + if (caps.size) { info.flags |= VFIO_DEVICE_FLAGS_CAPS; if (info.argsz < sizeof(info) + caps.size) { |