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Usable regions are those that are not reserved or protected. The extracted region is stored in GetGspStaticInfoReply and exposed as usable_fb_region field for use by the memory subsystem. Signed-off-by: Joel Fernandes Reviewed-by: John Hubbard --- drivers/gpu/nova-core/gsp/commands.rs | 9 +++++-- drivers/gpu/nova-core/gsp/fw/commands.rs | 40 +++++++++++++++++++++++++++++++- 2 files changed, 46 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/nova-core/gsp/commands.rs b/drivers/gpu/nova-core/gsp/commands.rs index f84de9f4f045..d955f52a93bb 100644 --- a/drivers/gpu/nova-core/gsp/commands.rs +++ b/drivers/gpu/nova-core/gsp/commands.rs @@ -5,6 +5,7 @@ array, convert::Infallible, ffi::FromBytesUntilNulError, + ops::Range, str::Utf8Error, // }; @@ -191,15 +192,18 @@ fn init(&self) -> impl Init { } } -/// The reply from the GSP to the [`GetGspInfo`] command. +/// The reply from the GSP to the [`GetGspStaticInfo`] command. 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, } impl MessageFromGsp for GetGspStaticInfoReply { const FUNCTION: MsgFunction = MsgFunction::GetGspStaticInfo; type Message = fw::commands::GspStaticConfigInfo; - type InitError = Infallible; + type InitError = Error; fn read( msg: &Self::Message, @@ -207,6 +211,7 @@ fn read( ) -> Result { Ok(GetGspStaticInfoReply { gpu_name: msg.gpu_name_str(), + usable_fb_region: msg.usable_fb_regions_iter().next().ok_or(ENODEV)?, }) } } diff --git a/drivers/gpu/nova-core/gsp/fw/commands.rs b/drivers/gpu/nova-core/gsp/fw/commands.rs index 7bcc41fc7fa0..d025167927df 100644 --- a/drivers/gpu/nova-core/gsp/fw/commands.rs +++ b/drivers/gpu/nova-core/gsp/fw/commands.rs @@ -1,6 +1,8 @@ // SPDX-License-Identifier: GPL-2.0 // SPDX-FileCopyrightText: Copyright (c) 2025-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved. +use core::ops::Range; + use kernel::{ device, pci, @@ -13,7 +15,8 @@ use crate::{ gpu::Chipset, - gsp::GSP_PAGE_SIZE, // + gsp::GSP_PAGE_SIZE, + num::IntoSafeCast, // }; use super::bindings; @@ -129,6 +132,41 @@ impl GspStaticConfigInfo { pub(crate) fn gpu_name_str(&self) -> [u8; 64] { self.0.gpuNameString } + + /// Returns an iterator over valid FB regions from GSP firmware data. + fn fb_regions( + &self, + ) -> impl Iterator { + let fb_info = &self.0.fbRegionInfoParams; + fb_info + .fbRegion + .iter() + .take(fb_info.numFBRegions.into_safe_cast()) + .filter(|reg| reg.limit >= reg.base) + } + + /// Iterates over usable FB regions from GSP firmware data. + /// + /// Each yielded region is a [`Range`] suitable for driver memory allocation. + /// Usable regions are those that satisfy all the following properties: + /// - Are not reserved for firmware internal use. + /// - Are not protected (hardware-enforced access restrictions). + /// - Support compression (can use GPU memory compression for bandwidth). + /// - Support ISO (isochronous memory for display requiring guaranteed bandwidth). + pub(crate) fn usable_fb_regions_iter(&self) -> impl Iterator> + '_ { + self.fb_regions().filter_map(|reg| { + // Filter: not reserved, not protected, supports compression and ISO. + if reg.reserved == 0 + && reg.bProtected == 0 + && reg.supportCompressed != 0 + && reg.supportISO != 0 + { + reg.limit.checked_add(1).map(|end| reg.base..end) + } else { + None + } + }) + } } // SAFETY: Padding is explicit and will not contain uninitialized data. -- 2.54.0