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cdeaeb9dd7
Add the initial nova-drm driver skeleton.
nova-drm is connected to nova-core through the auxiliary bus and
implements the DRM parts of the nova driver stack.
For now, it implements the fundamental DRM abstractions, i.e. creates a
DRM device and registers it, exposing a three sample IOCTLs.
DRM_IOCTL_NOVA_GETPARAM
- provides the PCI bar size from the bar that maps the GPUs VRAM
from nova-core
DRM_IOCTL_NOVA_GEM_CREATE
- creates a new dummy DRM GEM object and returns a handle
DRM_IOCTL_NOVA_GEM_INFO
- provides metadata for the DRM GEM object behind a given handle
I implemented a small userspace test suite [1] that utilizes this
interface.
Link: https://gitlab.freedesktop.org/dakr/drm-test [1]
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Acked-by: Dave Airlie <airlied@redhat.com>
Link: https://lore.kernel.org/r/20250424160452.8070-3-dakr@kernel.org
[ Kconfig: depend on DRM=y rather than just DRM. - Danilo ]
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
102 lines
2.0 KiB
C
102 lines
2.0 KiB
C
/* SPDX-License-Identifier: MIT */
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#ifndef __NOVA_DRM_H__
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#define __NOVA_DRM_H__
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#include "drm.h"
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/* DISCLAIMER: Do not use, this is not a stable uAPI.
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*
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* This uAPI serves only testing purposes as long as this driver is still in
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* development. It is required to implement and test infrastructure which is
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* upstreamed in the context of this driver. See also [1].
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*
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* [1] https://lore.kernel.org/dri-devel/Zfsj0_tb-0-tNrJy@cassiopeiae/T/#u
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*/
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/*
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* NOVA_GETPARAM_VRAM_BAR_SIZE
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*
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* Query the VRAM BAR size in bytes.
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*/
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#define NOVA_GETPARAM_VRAM_BAR_SIZE 0x1
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/**
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* struct drm_nova_getparam - query GPU and driver metadata
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*/
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struct drm_nova_getparam {
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/**
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* @param: The identifier of the parameter to query.
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*/
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__u64 param;
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/**
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* @value: The value for the specified parameter.
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*/
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__u64 value;
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};
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/**
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* struct drm_nova_gem_create - create a new DRM GEM object
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*/
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struct drm_nova_gem_create {
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/**
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* @handle: The handle of the new DRM GEM object.
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*/
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__u32 handle;
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/**
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* @pad: 32 bit padding, should be 0.
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*/
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__u32 pad;
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/**
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* @size: The size of the new DRM GEM object.
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*/
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__u64 size;
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};
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/**
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* struct drm_nova_gem_info - query DRM GEM object metadata
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*/
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struct drm_nova_gem_info {
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/**
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* @handle: The handle of the DRM GEM object to query.
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*/
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__u32 handle;
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/**
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* @pad: 32 bit padding, should be 0.
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*/
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__u32 pad;
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/**
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* @size: The size of the DRM GEM obejct.
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*/
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__u64 size;
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};
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#define DRM_NOVA_GETPARAM 0x00
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#define DRM_NOVA_GEM_CREATE 0x01
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#define DRM_NOVA_GEM_INFO 0x02
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/* Note: this is an enum so that it can be resolved by Rust bindgen. */
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enum {
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DRM_IOCTL_NOVA_GETPARAM = DRM_IOWR(DRM_COMMAND_BASE + DRM_NOVA_GETPARAM,
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struct drm_nova_getparam),
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DRM_IOCTL_NOVA_GEM_CREATE = DRM_IOWR(DRM_COMMAND_BASE + DRM_NOVA_GEM_CREATE,
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struct drm_nova_gem_create),
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DRM_IOCTL_NOVA_GEM_INFO = DRM_IOWR(DRM_COMMAND_BASE + DRM_NOVA_GEM_INFO,
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struct drm_nova_gem_info),
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};
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#if defined(__cplusplus)
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}
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#endif
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#endif /* __NOVA_DRM_H__ */
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