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charset="utf-8" Introduce GpuMm as the centralized GPU memory manager that owns: - Buddy allocator for VRAM allocation. - PRAMIN window for direct VRAM access. - TLB manager for translation buffer operations. This provides clean ownership model where GpuMm provides accessor methods for its components that can be used for memory management operations. Cc: Nikola Djukic Signed-off-by: Joel Fernandes --- drivers/gpu/nova-core/Kconfig | 1 + drivers/gpu/nova-core/gpu.rs | 34 ++++++++++++- drivers/gpu/nova-core/gsp/commands.rs | 2 - drivers/gpu/nova-core/mm.rs | 70 ++++++++++++++++++++++++++- 4 files changed, 102 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/nova-core/Kconfig b/drivers/gpu/nova-core/Kconfig index a4f2380654e2..6513007bf66f 100644 --- a/drivers/gpu/nova-core/Kconfig +++ b/drivers/gpu/nova-core/Kconfig @@ -4,6 +4,7 @@ config NOVA_CORE depends on PCI depends on RUST select AUXILIARY_BUS + select GPU_BUDDY select RUST_FW_LOADER_ABSTRACTIONS default n help diff --git a/drivers/gpu/nova-core/gpu.rs b/drivers/gpu/nova-core/gpu.rs index b4da4a1ae156..c49fa9c380b8 100644 --- a/drivers/gpu/nova-core/gpu.rs +++ b/drivers/gpu/nova-core/gpu.rs @@ -4,10 +4,13 @@ device, devres::Devres, fmt, + gpu::buddy::GpuBuddyParams, io::Io, num::Bounded, pci, prelude::*, + ptr::Alignment, + sizes::SZ_4K, sync::Arc, // }; =20 @@ -25,6 +28,7 @@ commands::GetGspStaticInfoReply, Gsp, // }, + mm::GpuMm, regs, }; =20 @@ -238,6 +242,9 @@ pub(crate) struct Gpu { gsp_falcon: Falcon, /// SEC2 falcon instance, used for GSP boot up and cleanup. sec2_falcon: Falcon, + /// GPU memory manager owning memory management resources. + #[pin] + mm: GpuMm, /// GSP runtime data. Temporarily an empty placeholder. #[pin] gsp: Gsp, @@ -274,7 +281,32 @@ pub(crate) fn new<'a>( =20 gsp <- Gsp::new(pdev), =20 - gsp_static_info: { gsp.boot(pdev, bar, spec.chipset, gsp_falco= n, sec2_falcon)? }, + gsp_static_info: { + let info =3D gsp.boot(pdev, bar, spec.chipset, gsp_falcon,= sec2_falcon)?; + + dev_info!( + pdev.as_ref(), + "Using FB region: {:#x}..{:#x}\n", + info.usable_fb_region.start, + info.usable_fb_region.end + ); + + info + }, + + // Create GPU memory manager owning memory management resource= s. + mm <- { + let usable_vram =3D &gsp_static_info.usable_fb_region; + + // PRAMIN covers all physical VRAM (including GSP-reserved= areas + // above the usable region, e.g. the BAR1 page directory). + let pramin_vram_region =3D 0..gsp_static_info.total_fb_end; + GpuMm::new(devres_bar.clone(), GpuBuddyParams { + base_offset: usable_vram.start, + size: usable_vram.end - usable_vram.start, + chunk_size: Alignment::new::(), + }, pramin_vram_region)? + }, =20 bar: devres_bar, }) diff --git a/drivers/gpu/nova-core/gsp/commands.rs b/drivers/gpu/nova-core/= gsp/commands.rs index 5e0649024637..ec03bf94b34e 100644 --- a/drivers/gpu/nova-core/gsp/commands.rs +++ b/drivers/gpu/nova-core/gsp/commands.rs @@ -194,10 +194,8 @@ fn init(&self) -> impl Init { pub(crate) struct GetGspStaticInfoReply { gpu_name: [u8; 64], /// Usable FB (VRAM) region for driver memory allocation. - #[expect(dead_code)] pub(crate) usable_fb_region: Range, /// End of VRAM. - #[expect(dead_code)] pub(crate) total_fb_end: u64, } =20 diff --git a/drivers/gpu/nova-core/mm.rs b/drivers/gpu/nova-core/mm.rs index cfe9cbe11d57..3c34d7f05555 100644 --- a/drivers/gpu/nova-core/mm.rs +++ b/drivers/gpu/nova-core/mm.rs @@ -7,9 +7,75 @@ pub(crate) mod pramin; pub(crate) mod tlb; =20 -use kernel::sizes::SZ_4K; +use kernel::{ + devres::Devres, + gpu::buddy::{ + GpuBuddy, + GpuBuddyParams, // + }, + prelude::*, + sizes::SZ_4K, + sync::Arc, // +}; =20 -use crate::num::u64_as_usize; +use crate::{ + driver::Bar0, + num::u64_as_usize, // +}; + +pub(crate) use tlb::Tlb; + +/// GPU Memory Manager - owns all core MM components. +/// +/// Provides centralized ownership of memory management resources: +/// - [`GpuBuddy`] allocator for VRAM page table allocation. +/// - [`pramin::Pramin`] for direct VRAM access. +/// - [`Tlb`] manager for translation buffer flush operations. +#[pin_data] +pub(crate) struct GpuMm { + buddy: GpuBuddy, + #[pin] + pramin: pramin::Pramin, + #[pin] + tlb: Tlb, +} + +impl GpuMm { + /// Create a pin-initializer for `GpuMm`. + /// + /// `pramin_vram_region` is the full physical VRAM range (including GS= P-reserved + /// areas). PRAMIN window accesses are validated against this range. + pub(crate) fn new( + bar: Arc>, + buddy_params: GpuBuddyParams, + pramin_vram_region: core::ops::Range, + ) -> Result> { + let buddy =3D GpuBuddy::new(buddy_params)?; + let tlb_init =3D Tlb::new(bar.clone()); + let pramin_init =3D pramin::Pramin::new(bar, pramin_vram_region)?; + + Ok(pin_init!(Self { + buddy, + pramin <- pramin_init, + tlb <- tlb_init, + })) + } + + /// Access the [`GpuBuddy`] allocator. + pub(crate) fn buddy(&self) -> &GpuBuddy { + &self.buddy + } + + /// Access the [`pramin::Pramin`]. + pub(crate) fn pramin(&self) -> &pramin::Pramin { + &self.pramin + } + + /// Access the [`Tlb`] manager. + pub(crate) fn tlb(&self) -> &Tlb { + &self.tlb + } +} =20 /// Page size in bytes (4 KiB). pub(crate) const PAGE_SIZE: usize =3D SZ_4K; --=20 2.34.1