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A region layer lets a mapping select a byte range while keeping the underlying allocation alive. For vGPU, communication buffers occupy only part of the management heap and need a BAR mapping of that range. Add VramRegion to describe ranges within a shared VramBlock and support bounds-checked subregions. Cc: Alistair Popple Signed-off-by: Zhi Wang Signed-off-by: Alok Kumar --- drivers/gpu/nova-core/mm/vram.rs | 56 ++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) diff --git a/drivers/gpu/nova-core/mm/vram.rs b/drivers/gpu/nova-core/mm/vram.rs index b6cc177825d7..bed90a3de8bd 100644 --- a/drivers/gpu/nova-core/mm/vram.rs +++ b/drivers/gpu/nova-core/mm/vram.rs @@ -34,6 +34,62 @@ impl VramBlock { pub(crate) const fn address(&self) -> u64 { self.address } + + /// Creates a byte range relative to this allocation, retaining its backing storage. + pub(crate) fn region(self: &Arc, range: Range) -> Result { + VramRegion::new(self.clone(), range) + } +} + +/// A byte range that keeps its VRAM allocation alive. +#[derive(Clone)] +pub(crate) struct VramRegion { + backing: Arc, + address: u64, + size: u64, +} + +impl VramRegion { + fn new(backing: Arc, range: Range) -> Result { + if range.start >= range.end || range.end > backing.size { + return Err(EINVAL); + } + + let size = range.end - range.start; + let address = backing.address.checked_add(range.start).ok_or(EOVERFLOW)?; + backing.address.checked_add(range.end).ok_or(EOVERFLOW)?; + + Ok(Self { + backing, + address, + size, + }) + } + + pub(crate) const fn address(&self) -> u64 { + self.address + } + + pub(crate) const fn size(&self) -> u64 { + self.size + } + + /// Creates a nonempty subregion relative to this view's start. + pub(crate) fn subregion(&self, range: Range) -> Result { + if range.start >= range.end || range.end > self.size { + return Err(EINVAL); + } + + let size = range.end - range.start; + let address = self.address.checked_add(range.start).ok_or(EOVERFLOW)?; + address.checked_add(size).ok_or(EOVERFLOW)?; + + Ok(Self { + backing: self.backing.clone(), + address, + size, + }) + } } impl GpuMm<'_> { -- 2.53.0