From eed2298d936087a1c85e0fa6f7170028e4f4fded Mon Sep 17 00:00:00 2001 From: Jorgen Hansen Date: Mon, 7 Feb 2022 02:27:20 -0800 Subject: VMCI: dma dg: detect DMA datagram capability Detect the VMCI DMA datagram capability, and if present, ack it to the device. Reviewed-by: Vishnu Dasa Signed-off-by: Jorgen Hansen Link: https://lore.kernel.org/r/20220207102725.2742-4-jhansen@vmware.com Signed-off-by: Greg Kroah-Hartman --- drivers/misc/vmw_vmci/vmci_guest.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'drivers/misc') diff --git a/drivers/misc/vmw_vmci/vmci_guest.c b/drivers/misc/vmw_vmci/vmci_guest.c index d30d66258e52..b93afe7f7119 100644 --- a/drivers/misc/vmw_vmci/vmci_guest.c +++ b/drivers/misc/vmw_vmci/vmci_guest.c @@ -562,6 +562,17 @@ static int vmci_guest_probe_device(struct pci_dev *pdev, } } + if (mmio_base != NULL) { + if (capabilities & VMCI_CAPS_DMA_DATAGRAM) { + caps_in_use |= VMCI_CAPS_DMA_DATAGRAM; + } else { + dev_err(&pdev->dev, + "Missing capability: VMCI_CAPS_DMA_DATAGRAM\n"); + error = -ENXIO; + goto err_free_data_buffer; + } + } + dev_info(&pdev->dev, "Using capabilities 0x%x\n", caps_in_use); /* Let the host know which capabilities we intend to use. */ -- cgit v1.2.3