[PATCH RFC 01/18] rust: drm: ioctl: Add DRM ioctl abstraction
Daniel Vetter
daniel at ffwll.ch
Thu Apr 13 09:23:58 UTC 2023
On Tue, Mar 07, 2023 at 11:25:26PM +0900, Asahi Lina wrote:
> DRM drivers need to be able to declare which driver-specific ioctls they
> support. This abstraction adds the required types and a helper macro to
> generate the ioctl definition inside the DRM driver.
>
> Note that this macro is not usable until further bits of the
> abstraction are in place (but it will not fail to compile on its own, if
> not called).
>
> Signed-off-by: Asahi Lina <lina at asahilina.net>
A bunch of thoughts/questions:
- You have the pub functions to create ioctl numbers, but it looks like
most drivers just do this in the C uapi headers instead and then use the
direct number from the bindings? I wonder whether we shouldn't just use
that as standard way, since in the end we do need the C headers for
userspace to use the ioctls/structs. Or could we generate the headers
from rust?
- More type safety would be nice. You have the one for device, but not yet
for DrmFile. At least if I read the examples in asahi/vgem right. Also
the FIXME for how to make sure you generate the table for the right kind
of driver would be nice to fix.
- Type safety against the size of the struct an ioctl number is great!
- I wonder whether we could adjust the type according to _IOR/W/RW, i.e.
if you have W then your ioctl function is Result<Struct>, if not then
Result<()> since it's just errno, and you get the paramater only when
you have R set. We had in the past confusions where people got this
wrong and wondered why their parameters don't make it to userspace.
- There's also the question of drm_ioctl() zero-extending the ioctl
parameter struct both ways (i.e. kernel kernel or newer userspace). I
think trying to encode that with Some() is overkill, but maybe worth a
thought.
- It would be _really_ great if rust ioctl abstractions enforce
https://dri.freedesktop.org/docs/drm/process/botching-up-ioctls.html at
the type level, i.e. everything naturally aligned, no gaps, all that
stuff. This would also hold for get/put_user and all these things (I
didn't look into that stuff yet in the drivers when you pull in entire
arrays).
Cheers, Daniel
> ---
> drivers/gpu/drm/Kconfig | 7 ++
> rust/bindings/bindings_helper.h | 2 +
> rust/kernel/drm/ioctl.rs | 147 ++++++++++++++++++++++++++++++++++++++++
> rust/kernel/drm/mod.rs | 5 ++
> rust/kernel/lib.rs | 2 +
> 5 files changed, 163 insertions(+)
>
> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> index dc0f94f02a82..dab8f0f9aa96 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -27,6 +27,13 @@ menuconfig DRM
> details. You should also select and configure AGP
> (/dev/agpgart) support if it is available for your platform.
>
> +# Rust abstractions cannot be built as modules currently, so force them as
> +# bool by using these intermediate symbols. In the future these could be
> +# tristate once abstractions themselves can be built as modules.
> +config RUST_DRM
> + bool "Rust support for the DRM subsystem"
> + depends on DRM=y
> +
> config DRM_MIPI_DBI
> tristate
> depends on DRM
> diff --git a/rust/bindings/bindings_helper.h b/rust/bindings/bindings_helper.h
> index 91bb7906ca5a..2687bef1676f 100644
> --- a/rust/bindings/bindings_helper.h
> +++ b/rust/bindings/bindings_helper.h
> @@ -6,6 +6,7 @@
> * Sorted alphabetically.
> */
>
> +#include <drm/drm_ioctl.h>
> #include <linux/delay.h>
> #include <linux/device.h>
> #include <linux/dma-mapping.h>
> @@ -23,6 +24,7 @@
> #include <linux/sysctl.h>
> #include <linux/timekeeping.h>
> #include <linux/xarray.h>
> +#include <uapi/drm/drm.h>
>
> /* `bindgen` gets confused at certain things. */
> const gfp_t BINDINGS_GFP_KERNEL = GFP_KERNEL;
> diff --git a/rust/kernel/drm/ioctl.rs b/rust/kernel/drm/ioctl.rs
> new file mode 100644
> index 000000000000..10304efbd5f1
> --- /dev/null
> +++ b/rust/kernel/drm/ioctl.rs
> @@ -0,0 +1,147 @@
> +// SPDX-License-Identifier: GPL-2.0 OR MIT
> +#![allow(non_snake_case)]
> +
> +//! DRM IOCTL definitions.
> +//!
> +//! C header: [`include/linux/drm/drm_ioctl.h`](../../../../include/linux/drm/drm_ioctl.h)
> +
> +use crate::ioctl;
> +
> +const BASE: u32 = bindings::DRM_IOCTL_BASE as u32;
> +
> +/// Construct a DRM ioctl number with no argument.
> +pub const fn IO(nr: u32) -> u32 {
> + ioctl::_IO(BASE, nr)
> +}
> +
> +/// Construct a DRM ioctl number with a read-only argument.
> +pub const fn IOR<T>(nr: u32) -> u32 {
> + ioctl::_IOR::<T>(BASE, nr)
> +}
> +
> +/// Construct a DRM ioctl number with a write-only argument.
> +pub const fn IOW<T>(nr: u32) -> u32 {
> + ioctl::_IOW::<T>(BASE, nr)
> +}
> +
> +/// Construct a DRM ioctl number with a read-write argument.
> +pub const fn IOWR<T>(nr: u32) -> u32 {
> + ioctl::_IOWR::<T>(BASE, nr)
> +}
> +
> +/// Descriptor type for DRM ioctls. Use the `declare_drm_ioctls!{}` macro to construct them.
> +pub type DrmIoctlDescriptor = bindings::drm_ioctl_desc;
> +
> +/// This is for ioctl which are used for rendering, and require that the file descriptor is either
> +/// for a render node, or if it’s a legacy/primary node, then it must be authenticated.
> +pub const AUTH: u32 = bindings::drm_ioctl_flags_DRM_AUTH;
> +
> +/// This must be set for any ioctl which can change the modeset or display state. Userspace must
> +/// call the ioctl through a primary node, while it is the active master.
> +///
> +/// Note that read-only modeset ioctl can also be called by unauthenticated clients, or when a
> +/// master is not the currently active one.
> +pub const MASTER: u32 = bindings::drm_ioctl_flags_DRM_MASTER;
> +
> +/// Anything that could potentially wreak a master file descriptor needs to have this flag set.
> +///
> +/// Current that’s only for the SETMASTER and DROPMASTER ioctl, which e.g. logind can call to force
> +/// a non-behaving master (display compositor) into compliance.
> +///
> +/// This is equivalent to callers with the SYSADMIN capability.
> +pub const ROOT_ONLY: u32 = bindings::drm_ioctl_flags_DRM_ROOT_ONLY;
> +
> +/// Whether drm_ioctl_desc.func should be called with the DRM BKL held or not. Enforced as the
> +/// default for all modern drivers, hence there should never be a need to set this flag.
> +///
> +/// Do not use anywhere else than for the VBLANK_WAIT IOCTL, which is the only legacy IOCTL which
> +/// needs this.
> +pub const UNLOCKED: u32 = bindings::drm_ioctl_flags_DRM_UNLOCKED;
> +
> +/// This is used for all ioctl needed for rendering only, for drivers which support render nodes.
> +/// This should be all new render drivers, and hence it should be always set for any ioctl with
> +/// `AUTH` set. Note though that read-only query ioctl might have this set, but have not set
> +/// DRM_AUTH because they do not require authentication.
> +pub const RENDER_ALLOW: u32 = bindings::drm_ioctl_flags_DRM_RENDER_ALLOW;
> +
> +/// Declare the DRM ioctls for a driver.
> +///
> +/// Each entry in the list should have the form:
> +///
> +/// `(ioctl_number, argument_type, flags, user_callback),`
> +///
> +/// `argument_type` is the type name within the `bindings` crate.
> +/// `user_callback` should have the following prototype:
> +///
> +/// ```
> +/// fn foo(device: &kernel::drm::device::Device<Self>,
> +/// data: &mut bindings::argument_type,
> +/// file: &kernel::drm::file::File<Self::File>,
> +/// )
> +/// ```
> +/// where `Self` is the drm::drv::Driver implementation these ioctls are being declared within.
> +///
> +/// # Examples
> +///
> +/// ```
> +/// kernel::declare_drm_ioctls! {
> +/// (FOO_GET_PARAM, drm_foo_get_param, ioctl::RENDER_ALLOW, my_get_param_handler),
> +/// }
> +/// ```
> +///
> +#[macro_export]
> +macro_rules! declare_drm_ioctls {
> + ( $(($cmd:ident, $struct:ident, $flags:expr, $func:expr)),* $(,)? ) => {
> + const IOCTLS: &'static [$crate::drm::ioctl::DrmIoctlDescriptor] = {
> + const _:() = {
> + let i: u32 = $crate::bindings::DRM_COMMAND_BASE;
> + // Assert that all the IOCTLs are in the right order and there are no gaps,
> + // and that the sizeof of the specified type is correct.
> + $(
> + let cmd: u32 = $crate::macros::concat_idents!($crate::bindings::DRM_IOCTL_, $cmd);
> + ::core::assert!(i == $crate::ioctl::_IOC_NR(cmd));
> + ::core::assert!(core::mem::size_of::<$crate::bindings::$struct>() == $crate::ioctl::_IOC_SIZE(cmd));
> + let i: u32 = i + 1;
> + )*
> + };
> +
> + let ioctls = &[$(
> + $crate::bindings::drm_ioctl_desc {
> + cmd: $crate::macros::concat_idents!($crate::bindings::DRM_IOCTL_, $cmd) as u32,
> + func: {
> + #[allow(non_snake_case)]
> + unsafe extern "C" fn $cmd(
> + raw_dev: *mut $crate::bindings::drm_device,
> + raw_data: *mut ::core::ffi::c_void,
> + raw_file_priv: *mut $crate::bindings::drm_file,
> + ) -> core::ffi::c_int {
> + // SAFETY: We never drop this, and the DRM core ensures the device lives
> + // while callbacks are being called.
> + //
> + // FIXME: Currently there is nothing enforcing that the types of the
> + // dev/file match the current driver these ioctls are being declared
> + // for, and it's not clear how to enforce this within the type system.
> + let dev = ::core::mem::ManuallyDrop::new(unsafe {
> + $crate::drm::device::Device::from_raw(raw_dev)
> + });
> + // SAFETY: This is just the ioctl argument, which hopefully has the right type
> + // (we've done our best checking the size).
> + let data = unsafe { &mut *(raw_data as *mut $crate::bindings::$struct) };
> + // SAFETY: This is just the DRM file structure
> + let file = unsafe { $crate::drm::file::File::from_raw(raw_file_priv) };
> +
> + match $func(&*dev, data, &file) {
> + Err(e) => e.to_kernel_errno(),
> + Ok(i) => i.try_into().unwrap_or(ERANGE.to_kernel_errno()),
> + }
> + }
> + Some($cmd)
> + },
> + flags: $flags,
> + name: $crate::c_str!(::core::stringify!($cmd)).as_char_ptr(),
> + }
> + ),*];
> + ioctls
> + };
> + };
> +}
> diff --git a/rust/kernel/drm/mod.rs b/rust/kernel/drm/mod.rs
> new file mode 100644
> index 000000000000..9ec6d7cbcaf3
> --- /dev/null
> +++ b/rust/kernel/drm/mod.rs
> @@ -0,0 +1,5 @@
> +// SPDX-License-Identifier: GPL-2.0 OR MIT
> +
> +//! DRM subsystem abstractions.
> +
> +pub mod ioctl;
> diff --git a/rust/kernel/lib.rs b/rust/kernel/lib.rs
> index 7903490816bf..cb23d24c6718 100644
> --- a/rust/kernel/lib.rs
> +++ b/rust/kernel/lib.rs
> @@ -37,6 +37,8 @@ mod build_assert;
> pub mod delay;
> pub mod device;
> pub mod driver;
> +#[cfg(CONFIG_RUST_DRM)]
> +pub mod drm;
> pub mod error;
> pub mod io_buffer;
> pub mod io_mem;
>
> --
> 2.35.1
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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