diff options
| -rw-r--r-- | drivers/gpu/drm/nova/file.rs | 23 | ||||
| -rw-r--r-- | drivers/gpu/drm/nova/nova.rs | 1 | ||||
| -rw-r--r-- | drivers/gpu/drm/nova/uapi.rs | 61 | ||||
| -rw-r--r-- | rust/kernel/drm/ioctl.rs | 11 |
4 files changed, 16 insertions, 80 deletions
diff --git a/drivers/gpu/drm/nova/file.rs b/drivers/gpu/drm/nova/file.rs index 7e59a34b830d..7e7d4e2de2fb 100644 --- a/drivers/gpu/drm/nova/file.rs +++ b/drivers/gpu/drm/nova/file.rs @@ -2,13 +2,11 @@ use crate::driver::{NovaDevice, NovaDriver}; use crate::gem::NovaObject; -use crate::uapi::{GemCreate, GemInfo, Getparam}; use kernel::{ alloc::flags::*, drm::{self, gem::BaseObject}, pci, prelude::*, - types::Opaque, uapi, }; @@ -26,20 +24,19 @@ impl File { /// IOCTL: get_param: Query GPU / driver metadata. pub(crate) fn get_param( dev: &NovaDevice, - getparam: &Opaque<uapi::drm_nova_getparam>, + getparam: &mut uapi::drm_nova_getparam, _file: &drm::File<File>, ) -> Result<u32> { let adev = &dev.adev; let parent = adev.parent().ok_or(ENOENT)?; let pdev: &pci::Device = parent.try_into()?; - let getparam: &Getparam = getparam.into(); - let value = match getparam.param() as u32 { + let value = match getparam.param as u32 { uapi::NOVA_GETPARAM_VRAM_BAR_SIZE => pdev.resource_len(1)?, _ => return Err(EINVAL), }; - getparam.set_value(value); + getparam.value = value; Ok(0) } @@ -47,13 +44,12 @@ impl File { /// IOCTL: gem_create: Create a new DRM GEM object. pub(crate) fn gem_create( dev: &NovaDevice, - req: &Opaque<uapi::drm_nova_gem_create>, + req: &mut uapi::drm_nova_gem_create, file: &drm::File<File>, ) -> Result<u32> { - let req: &GemCreate = req.into(); - let obj = NovaObject::new(dev, req.size().try_into()?)?; + let obj = NovaObject::new(dev, req.size.try_into()?)?; - req.set_handle(obj.create_handle(file)?); + req.handle = obj.create_handle(file)?; Ok(0) } @@ -61,13 +57,12 @@ impl File { /// IOCTL: gem_info: Query GEM metadata. pub(crate) fn gem_info( _dev: &NovaDevice, - req: &Opaque<uapi::drm_nova_gem_info>, + req: &mut uapi::drm_nova_gem_info, file: &drm::File<File>, ) -> Result<u32> { - let req: &GemInfo = req.into(); - let bo = NovaObject::lookup_handle(file, req.handle())?; + let bo = NovaObject::lookup_handle(file, req.handle)?; - req.set_size(bo.size().try_into()?); + req.size = bo.size().try_into()?; Ok(0) } diff --git a/drivers/gpu/drm/nova/nova.rs b/drivers/gpu/drm/nova/nova.rs index 902876aa14d1..730598defe04 100644 --- a/drivers/gpu/drm/nova/nova.rs +++ b/drivers/gpu/drm/nova/nova.rs @@ -5,7 +5,6 @@ mod driver; mod file; mod gem; -mod uapi; use crate::driver::NovaDriver; diff --git a/drivers/gpu/drm/nova/uapi.rs b/drivers/gpu/drm/nova/uapi.rs deleted file mode 100644 index eb228a58d423..000000000000 --- a/drivers/gpu/drm/nova/uapi.rs +++ /dev/null @@ -1,61 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 - -use kernel::uapi; - -// TODO Work out some common infrastructure to avoid boilerplate code for uAPI abstractions. - -macro_rules! define_uapi_abstraction { - ($name:ident <= $inner:ty) => { - #[repr(transparent)] - pub struct $name(::kernel::types::Opaque<$inner>); - - impl ::core::convert::From<&::kernel::types::Opaque<$inner>> for &$name { - fn from(value: &::kernel::types::Opaque<$inner>) -> Self { - // SAFETY: `Self` is a transparent wrapper of `$inner`. - unsafe { ::core::mem::transmute(value) } - } - } - }; -} - -define_uapi_abstraction!(Getparam <= uapi::drm_nova_getparam); - -impl Getparam { - pub fn param(&self) -> u64 { - // SAFETY: `self.get()` is a valid pointer to a `struct drm_nova_getparam`. - unsafe { (*self.0.get()).param } - } - - pub fn set_value(&self, v: u64) { - // SAFETY: `self.get()` is a valid pointer to a `struct drm_nova_getparam`. - unsafe { (*self.0.get()).value = v }; - } -} - -define_uapi_abstraction!(GemCreate <= uapi::drm_nova_gem_create); - -impl GemCreate { - pub fn size(&self) -> u64 { - // SAFETY: `self.get()` is a valid pointer to a `struct drm_nova_gem_create`. - unsafe { (*self.0.get()).size } - } - - pub fn set_handle(&self, handle: u32) { - // SAFETY: `self.get()` is a valid pointer to a `struct drm_nova_gem_create`. - unsafe { (*self.0.get()).handle = handle }; - } -} - -define_uapi_abstraction!(GemInfo <= uapi::drm_nova_gem_info); - -impl GemInfo { - pub fn handle(&self) -> u32 { - // SAFETY: `self.get()` is a valid pointer to a `struct drm_nova_gem_info`. - unsafe { (*self.0.get()).handle } - } - - pub fn set_size(&self, size: u64) { - // SAFETY: `self.get()` is a valid pointer to a `struct drm_nova_gem_info`. - unsafe { (*self.0.get()).size = size }; - } -} diff --git a/rust/kernel/drm/ioctl.rs b/rust/kernel/drm/ioctl.rs index fdec01c37168..af1bb29cf06d 100644 --- a/rust/kernel/drm/ioctl.rs +++ b/rust/kernel/drm/ioctl.rs @@ -83,7 +83,7 @@ pub mod internal { /// /// ```ignore /// fn foo(device: &kernel::drm::Device<Self>, -/// data: &Opaque<uapi::argument_type>, +/// data: &mut uapi::argument_type, /// file: &kernel::drm::File<Self::File>, /// ) -> Result<u32> /// ``` @@ -138,9 +138,12 @@ macro_rules! declare_drm_ioctls { // SAFETY: The ioctl argument has size `_IOC_SIZE(cmd)`, which we // asserted above matches the size of this type, and all bit patterns of // UAPI structs must be valid. - let data = unsafe { - &*(raw_data as *const $crate::types::Opaque<$crate::uapi::$struct>) - }; + // The `ioctl` argument is exclusively owned by the handler + // and guaranteed by the C implementation (`drm_ioctl()`) to remain + // valid for the entire lifetime of the reference taken here. + // There is no concurrent access or aliasing; no other references + // to this object exist during this call. + let data = unsafe { &mut *(raw_data.cast::<$crate::uapi::$struct>()) }; // SAFETY: This is just the DRM file structure let file = unsafe { $crate::drm::File::from_raw(raw_file) }; |