Commit eed2298d authored by Jorgen Hansen's avatar Jorgen Hansen Committed by Greg Kroah-Hartman
Browse files

VMCI: dma dg: detect DMA datagram capability 



Detect the VMCI DMA datagram capability, and if present, ack it
to the device.

Reviewed-by: default avatarVishnu Dasa <vdasa@vmware.com>
Signed-off-by: default avatarJorgen Hansen <jhansen@vmware.com>
Link: https://lore.kernel.org/r/20220207102725.2742-4-jhansen@vmware.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e283a0e8

drivers/misc/vmw_vmci/vmci_guest.c

+11 −0
Original line number Diff line number Diff line
@@ -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. */

include/linux/vmw_vmci_defs.h

+1 −0
Original line number Diff line number Diff line
@@ -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)