A new version of the VMCI device will introduce two new major changes: - support MMIO access to device registers - support send/receive of datagrams using DMA transfers instead of ioread8_rep/iowrite8_rep operations This patch series updates the VMCI driver to support these new features while maintaining backwards compatibility. The DMA based datagram operations use a send and a receive buffer allocated at module load time. The buffer contains a header describing the layout of the buffer followed by either an SG list or inline data. The header also contains a flag indicating whether the buffer is currently owned by the driver or the device. Both for send and receive, the driver will initialize the buffer, transfer ownership to the device by writing the buffer address to a register, and then wait for the ownership to be transferred back. The device will generate an interrupt when this happens. v2 (fixes issues flagged by kernel test robot <lkp@xxxxxxxxx>): - changed type of mmio_base to void __iomem * - made vmci_read_reg, vmci_write_reg and vmci_write_data static functions Jorgen Hansen (8): VMCI: dma dg: whitespace formatting change for vmci register defines VMCI: dma dg: add MMIO access to registers VMCI: dma dg: detect DMA datagram capability VMCI: dma dg: set OS page size VMCI: dma dg: register dummy IRQ handlers for DMA datagrams VMCI: dma dg: allocate send and receive buffers for DMA datagrams VMCI: dma dg: add support for DMA datagrams sends VMCI: dma dg: add support for DMA datagrams receive drivers/misc/vmw_vmci/vmci_guest.c | 340 ++++++++++++++++++++++++----- include/linux/vmw_vmci_defs.h | 84 ++++++- 2 files changed, 361 insertions(+), 63 deletions(-) -- 2.25.1 _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
