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b=Ad2yV5YNeoJ9zzsdaHBjO699sFgtNfEpNes8sd89X4omIZJ0YEBy1O3hp6lny0yrZ ILWO5eA0XWuT9RzwLMcDuv6Ntp704U58ULZdRrvE0BRzdadauWkHDNUhlIy8diW1Sr y2192xF79yqliPNZoabgcXQVuZLHO4PMDutNKFhydmoevRH0wase5xQGcjIK3FY0MF X68jQ0rwPyOETqlGGi+u4y12ceGmY4P7LGDzXxyCxL6+cmnuL8MODVCaf7moeka6WD 3HKhRHP7rRXVx3CpCriHEXbkddLjKiLXtEypIBzfxSe7hBKwxGoElFYScXxEcY8u6u LdzxlHXBI2jCg== From: Leon Romanovsky To: Alex Williamson Cc: Leon Romanovsky , Jason Gunthorpe , Andrew Morton , Bjorn Helgaas , =?UTF-8?q?Christian=20K=C3=B6nig?= , dri-devel@lists.freedesktop.org, iommu@lists.linux.dev, Jens Axboe , Joerg Roedel , kvm@vger.kernel.org, linaro-mm-sig@lists.linaro.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-mm@kvack.org, linux-pci@vger.kernel.org, Logan Gunthorpe , Marek Szyprowski , Robin Murphy , Sumit Semwal , Vivek Kasireddy , Will Deacon Subject: [PATCH v2 08/10] vfio/pci: Enable peer-to-peer DMA transactions by default Date: Thu, 11 Sep 2025 14:33:12 +0300 Message-ID: <536369328cdeda87ae37b37c63f800d38186034d.1757589589.git.leon@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 1A1AB40009 X-Stat-Signature: smrj3jidffdds11zd5ki79itkzmjkqoz X-Rspam-User: X-HE-Tag: 1757590453-420096 X-HE-Meta: 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 98MoBu5I oS9xcwJOZBcfGRc7RRI6wR7zbVlWemiMFqxzSP81lAnro6kNRiTFp94oq3Al7zt9GKFwxX3sd5/cLDSXY38Py2LiGjgdtn0CmbiPxOGVun/KoYEaWM7Ow6HHrWQzSfmXpy4B7TEJVkLzYxuUVWQYn4FtsOA0GWHGIwI32wZjBF7umkdVHylxAu19ySoGERlL/f2CiyO26sFKfC+m8nLM66+9lLmlRUkmGVIhy5gwk5duachEtIyUQHrJRxJHuAVpLJo18BPedj8gHUAdtWNx+QDCiThYBLlYNQZQTJmAKrW11+hw= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Leon Romanovsky Make sure that all VFIO PCI devices have peer-to-peer capabilities enables, so we would be able to export their MMIO memory through DMABUF, Signed-off-by: Leon Romanovsky --- drivers/vfio/pci/vfio_pci_core.c | 11 +++++++++++ include/linux/vfio_pci_core.h | 3 +++ 2 files changed, 14 insertions(+) diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c index 7dcf5439dedc9..b02dda8c96341 100644 --- a/drivers/vfio/pci/vfio_pci_core.c +++ b/drivers/vfio/pci/vfio_pci_core.c @@ -28,6 +28,9 @@ #include #include #include +#ifdef CONFIG_VFIO_PCI_DMABUF +#include +#endif #if IS_ENABLED(CONFIG_EEH) #include #endif @@ -2085,6 +2088,7 @@ int vfio_pci_core_init_dev(struct vfio_device *core_vdev) { struct vfio_pci_core_device *vdev = container_of(core_vdev, struct vfio_pci_core_device, vdev); + int i; vdev->pdev = to_pci_dev(core_vdev->dev); vdev->irq_type = VFIO_PCI_NUM_IRQS; @@ -2094,6 +2098,13 @@ int vfio_pci_core_init_dev(struct vfio_device *core_vdev) INIT_LIST_HEAD(&vdev->dummy_resources_list); INIT_LIST_HEAD(&vdev->ioeventfds_list); INIT_LIST_HEAD(&vdev->sriov_pfs_item); +#ifdef CONFIG_VFIO_PCI_DMABUF + for (i = 0; i < PCI_STD_NUM_BARS; i++) { + vdev->provider[i] = pcim_p2pdma_enable(vdev->pdev, i); + if (IS_ERR(vdev->provider[i])) + return PTR_ERR(vdev->provider[i]); + } +#endif init_rwsem(&vdev->memory_lock); xa_init(&vdev->ctx); diff --git a/include/linux/vfio_pci_core.h b/include/linux/vfio_pci_core.h index f541044e42a2a..2184ba65348b8 100644 --- a/include/linux/vfio_pci_core.h +++ b/include/linux/vfio_pci_core.h @@ -94,6 +94,9 @@ struct vfio_pci_core_device { struct vfio_pci_core_device *sriov_pf_core_dev; struct notifier_block nb; struct rw_semaphore memory_lock; +#ifdef CONFIG_VFIO_PCI_DMABUF + struct p2pdma_provider *provider[PCI_STD_NUM_BARS]; +#endif }; /* Will be exported for vfio pci drivers usage */ -- 2.51.0