Messages in this thread Patch in this message | | | From | Jorgen Hansen <> | Subject | [PATCH v2 3/8] VMCI: dma dg: detect DMA datagram capability | Date | Thu, 3 Feb 2022 05:12:32 -0800 |
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Detect the VMCI DMA datagram capability, and if present, ack it to the device.
Reviewed-by: Vishnu Dasa <vdasa@vmware.com> Signed-off-by: Jorgen Hansen <jhansen@vmware.com> --- drivers/misc/vmw_vmci/vmci_guest.c | 11 +++++++++++ include/linux/vmw_vmci_defs.h | 1 + 2 files changed, 12 insertions(+)
diff --git a/drivers/misc/vmw_vmci/vmci_guest.c b/drivers/misc/vmw_vmci/vmci_guest.c index 38ee7ed32ab9..5a99d8e27873 100644 --- a/drivers/misc/vmw_vmci/vmci_guest.c +++ b/drivers/misc/vmw_vmci/vmci_guest.c @@ -565,6 +565,17 @@ 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. */ diff --git a/include/linux/vmw_vmci_defs.h b/include/linux/vmw_vmci_defs.h index 8fc00e2685cf..1ce2cffdc3ae 100644 --- a/include/linux/vmw_vmci_defs.h +++ b/include/linux/vmw_vmci_defs.h @@ -39,6 +39,7 @@ #define VMCI_CAPS_DATAGRAM BIT(2) #define VMCI_CAPS_NOTIFICATIONS BIT(3) #define VMCI_CAPS_PPN64 BIT(4) +#define VMCI_CAPS_DMA_DATAGRAM BIT(5) /* Interrupt Cause register bits. */ #define VMCI_ICR_DATAGRAM BIT(0) -- 2.25.1
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