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vfio/cdx: add support for CDX bus

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vfio-cdx driver enables IOCTLs for user space to query
MMIO regions for CDX devices and mmap them. This change
also adds support for reset of CDX devices. With VFIO
enabled on CDX devices, user-space applications can also
exercise DMA securely via IOMMU on these devices.

This change adds the VFIO CDX driver and enables the following
ioctls for CDX devices:
 - VFIO_DEVICE_GET_INFO:
 - VFIO_DEVICE_GET_REGION_INFO
 - VFIO_DEVICE_RESET

Signed-off-by: Nipun Gupta <nipun.gupta@amd.com>
Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com>
Tested-by: Nikhil Agarwal <nikhil.agarwal@amd.com>
Link: https://lore.kernel.org/r/20230531124557.11009-1-nipun.gupta@amd.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Nipun Gupta
2023-05-31 18:15:57 +05:30
committed by Alex Williamson
parent 1e44c58cc4
commit 234489ac56
12 changed files with 320 additions and 2 deletions
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1
include/linux/cdx/cdx_bus.h
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@@ -14,7 +14,6 @@
#include <linux/mod_devicetable.h>
#define MAX_CDX_DEV_RESOURCES 4
#define CDX_ANY_ID (0xFFFF)
#define CDX_CONTROLLER_ID_SHIFT 4
#define CDX_BUS_NUM_MASK 0xF