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Signed-off-by: Joel Fernandes --- drivers/gpu/nova-core/mm.rs | 66 +++++++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) diff --git a/drivers/gpu/nova-core/mm.rs b/drivers/gpu/nova-core/mm.rs index 08d74710f790..b23667a55ecd 100644 --- a/drivers/gpu/nova-core/mm.rs +++ b/drivers/gpu/nova-core/mm.rs @@ -42,6 +42,7 @@ macro_rules! impl_pfn_bounded { num::Bounded, pci, prelude::*, + sizes::SZ_4K, sync::Arc, // }; @@ -99,6 +100,9 @@ pub(crate) fn run_mm_selftests( Ok(()) } +/// Page size in bytes (4 KiB). +pub(crate) const PAGE_SIZE: usize = SZ_4K; + bitfield! { /// Physical VRAM address in GPU video memory. pub(crate) struct VramAddress(u64) { @@ -207,6 +211,29 @@ fn into_vram_range(self) -> Range { } } +bitfield! { + /// Virtual address in GPU address space. + pub(crate) struct VirtualAddress(u64) { + /// Offset within 4KB page. + 11:0 offset; + /// Virtual frame number. + 63:12 frame_number => Vfn; + } +} + +impl VirtualAddress { + /// Create a new virtual address from a raw value. + pub(crate) const fn new(addr: u64) -> Self { + Self::from_raw(addr) + } +} + +impl From for VirtualAddress { + fn from(vfn: Vfn) -> Self { + Self::zeroed().with_frame_number(vfn) + } +} + /// Physical Frame Number. /// /// Represents a physical page in VRAM. @@ -245,3 +272,42 @@ fn from(pfn: Pfn) -> Self { } impl_pfn_bounded!(52); + +/// Virtual Frame Number. +/// +/// Represents a virtual page in GPU address space. +#[repr(transparent)] +#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)] +pub(crate) struct Vfn(u64); + +impl Vfn { + /// Create a new VFN from a frame number. + pub(crate) const fn new(frame_number: u64) -> Self { + Self(frame_number) + } + + /// Get the raw frame number. + pub(crate) const fn raw(self) -> u64 { + self.0 + } +} + +impl From for Vfn { + fn from(addr: VirtualAddress) -> Self { + addr.frame_number() + } +} + +impl From for Vfn { + fn from(val: u64) -> Self { + Self(val) + } +} + +impl From for u64 { + fn from(vfn: Vfn) -> Self { + vfn.0 + } +} + +impl_frame_number_bounded!(Vfn, 52); -- 2.34.1