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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Dec 2024 10:52:17.8242 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ecae0a17-be8f-4c2e-da1a-08dd16ad37e1 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CH2PEPF00000140.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR12MB8119 X-ZohoMail-DKIM: pass (identity @amd.com) X-ZM-MESSAGEID: 1733568766226116600 Content-Type: text/plain; charset="utf-8" To get the p2pdma_distance, this create a new privcmd ioctl to calculate p2pdma_distance for two pci devices on the host with pci notations sent from guest virtgpu driver. Signed-off-by: Julia Zhang --- drivers/xen/privcmd.c | 42 ++++++++++++++++++++++++++++++++++++++ include/uapi/xen/privcmd.h | 12 +++++++++++ 2 files changed, 54 insertions(+) diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c index 72c161e94731..95f67815a2ef 100644 --- a/drivers/xen/privcmd.c +++ b/drivers/xen/privcmd.c @@ -31,6 +31,9 @@ #include #include #include +#include +#include +#include =20 #include #include @@ -977,6 +980,42 @@ static long privcmd_ioctl_map_hva_to_gpfns(struct file= *file, void __user *udata return ret; } =20 +static int privcmd_ioctl_p2pdma_distance(struct file *file, void __user *u= data) +{ + struct privcmd_p2pdma_distance kdata; + struct pci_dev *provider =3D NULL; + struct pci_dev *client =3D NULL; + struct pci_dev *dev =3D NULL; + enum pci_p2pdma_map_type map; + + if (copy_from_user(&kdata, udata, sizeof(kdata))) + return -EFAULT; + + for_each_pci_dev(dev) { + if (dev->bus->number =3D=3D kdata.provider_bus && + dev->devfn =3D=3D PCI_DEVFN(kdata.provider_slot, kdata.provider_func= )) { + provider =3D dev; + } else if (dev->bus->number =3D=3D kdata.client_bus && + dev->devfn =3D=3D PCI_DEVFN(kdata.client_slot, kdata.client_func)) { + client =3D dev; + } else { + continue; + } + } + + if (!provider || !client) { + pr_err("%s fail to get provider or client.\n", __func__); + return -EINVAL; + } + + kdata.distance =3D pci_p2pdma_distance(provider, &client->dev, false); + + if (copy_to_user(udata, &kdata, sizeof(kdata))) + return -EFAULT; + + return 0; +} + #ifdef CONFIG_XEN_PRIVCMD_EVENTFD /* Irqfd support */ static struct workqueue_struct *irqfd_cleanup_wq; @@ -1684,6 +1723,9 @@ static long privcmd_ioctl(struct file *file, ret =3D privcmd_ioctl_map_hva_to_gpfns(file, udata); break; =20 + case IOCTL_PRIVCMD_P2PDMA_DISTANCE: + ret =3D privcmd_ioctl_p2pdma_distance(file, udata); + break; =20 default: break; diff --git a/include/uapi/xen/privcmd.h b/include/uapi/xen/privcmd.h index d131002dd48f..a7ec3704519f 100644 --- a/include/uapi/xen/privcmd.h +++ b/include/uapi/xen/privcmd.h @@ -141,6 +141,16 @@ struct privcmd_map_hva_to_gpfns { int add_mapping; }; =20 +struct privcmd_p2pdma_distance { + __u32 provider_bus; + __u32 provider_slot; + __u32 provider_func; + __u32 client_bus; + __u32 client_slot; + __u32 client_func; + __u32 distance; +}; + /* * @cmd: IOCTL_PRIVCMD_HYPERCALL * @arg: &privcmd_hypercall_t @@ -174,6 +184,8 @@ struct privcmd_map_hva_to_gpfns { _IOW('P', 9, struct privcmd_ioeventfd) #define IOCTL_PRIVCMD_PCIDEV_GET_GSI \ _IOC(_IOC_NONE, 'P', 10, sizeof(struct privcmd_pcidev_get_gsi)) +#define IOCTL_PRIVCMD_P2PDMA_DISTANCE \ + _IOC(_IOC_NONE, 'P', 11, sizeof(struct privcmd_p2pdma_distance)) #define IOCTL_PRIVCMD_MAP_HVA_TO_GPFNS \ _IOC(_IOC_NONE, 'P', 13, sizeof(struct privcmd_map_hva_to_gpfns)) =20 --=20 2.34.1