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VMCI: dma dg: detect DMA datagram capability

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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>
Link: https://lore.kernel.org/r/20220207102725.2742-4-jhansen@vmware.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jorgen Hansen 2022-02-07 02:27:20 -08:00 committed by Greg Kroah-Hartman
parent e283a0e8b7
commit eed2298d93
2 changed files with 12 additions and 0 deletions
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11
drivers/misc/vmw_vmci/vmci_guest.c
View file

@ -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. */

1
include/linux/vmw_vmci_defs.h
View file

@ -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)