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Message-Id: <20250420-nova-frts-v1-14-ecd1cca23963@nvidia.com>
Date: Sun, 20 Apr 2025 21:19:46 +0900
From: Alexandre Courbot <acourbot@...dia.com>
To: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>,
Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
Björn Roy Baron <bjorn3_gh@...tonmail.com>,
Benno Lossin <benno.lossin@...ton.me>,
Andreas Hindborg <a.hindborg@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>,
Trevor Gross <tmgross@...ch.edu>, Danilo Krummrich <dakr@...nel.org>,
David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
Jonathan Corbet <corbet@....net>
Cc: John Hubbard <jhubbard@...dia.com>, Ben Skeggs <bskeggs@...dia.com>,
Joel Fernandes <joelagnelf@...dia.com>, Timur Tabi <ttabi@...dia.com>,
Alistair Popple <apopple@...dia.com>, linux-kernel@...r.kernel.org,
rust-for-linux@...r.kernel.org, nouveau@...ts.freedesktop.org,
dri-devel@...ts.freedesktop.org, Alexandre Courbot <acourbot@...dia.com>
Subject: [PATCH 14/16] gpu: nova-core: compute layout of the FRTS region
FWSEC-FRTS is run with the desired address of the FRTS region as
parameter, which we need to compute depending on some hardware
parameters.
Do this in a `FbLayout` structure, that will be later extended to
describe more memory regions used to boot the GSP.
Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
---
drivers/gpu/nova-core/gpu.rs | 4 ++
drivers/gpu/nova-core/gsp.rs | 3 +
drivers/gpu/nova-core/gsp/fb.rs | 109 +++++++++++++++++++++++++++++++++++++
drivers/gpu/nova-core/nova_core.rs | 1 +
drivers/gpu/nova-core/regs.rs | 27 +++++++++
5 files changed, 144 insertions(+)
diff --git a/drivers/gpu/nova-core/gpu.rs b/drivers/gpu/nova-core/gpu.rs
index 2344dfc69fe4246644437d70572680a4450b5bd7..b43d1fc6bba15ffd76d564eccdb9e2afe239a3a4 100644
--- a/drivers/gpu/nova-core/gpu.rs
+++ b/drivers/gpu/nova-core/gpu.rs
@@ -8,6 +8,7 @@
use crate::falcon::gsp::GspFalcon;
use crate::falcon::sec2::Sec2Falcon;
use crate::firmware::Firmware;
+use crate::gsp::fb::FbLayout;
use crate::regs;
use crate::timer::Timer;
use crate::util;
@@ -241,6 +242,9 @@ pub(crate) fn new(
let bios = Vbios::probe(&bar)?;
+ let fb_layout = FbLayout::new(spec.chipset, &bar)?;
+ dev_dbg!(pdev.as_ref(), "{:#x?}\n", fb_layout);
+
Ok(pin_init!(Self {
spec,
bar,
diff --git a/drivers/gpu/nova-core/gsp.rs b/drivers/gpu/nova-core/gsp.rs
new file mode 100644
index 0000000000000000000000000000000000000000..27616a9d2b7069b18661fc97811fa1cac285b8f8
--- /dev/null
+++ b/drivers/gpu/nova-core/gsp.rs
@@ -0,0 +1,3 @@
+// SPDX-License-Identifier: GPL-2.0
+
+pub(crate) mod fb;
diff --git a/drivers/gpu/nova-core/gsp/fb.rs b/drivers/gpu/nova-core/gsp/fb.rs
new file mode 100644
index 0000000000000000000000000000000000000000..63f41dfa184c434aa4eb7d4cb1f5f1e6f0552563
--- /dev/null
+++ b/drivers/gpu/nova-core/gsp/fb.rs
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0
+
+use core::ops::Range;
+
+use kernel::devres::Devres;
+use kernel::prelude::*;
+
+use crate::driver::Bar0;
+use crate::gpu::Chipset;
+use crate::regs;
+
+fn align_down(value: u64, align: u64) -> u64 {
+ value & !(align - 1)
+}
+
+/// Layout of the GPU framebuffer memory.
+///
+/// Contains ranges of GPU memory reserved for a given purpose during the GSP bootup process.
+#[derive(Debug)]
+#[allow(dead_code)]
+pub(crate) struct FbLayout {
+ pub fb: Range<u64>,
+
+ pub vga_workspace: Range<u64>,
+ pub bios: Range<u64>,
+
+ pub frts: Range<u64>,
+}
+
+impl FbLayout {
+ pub(crate) fn new(chipset: Chipset, bar: &Devres<Bar0>) -> Result<Self> {
+ let fb = {
+ let fb_size = with_bar!(bar, |b| vidmem_size(b, chipset))?;
+
+ 0..fb_size
+ };
+ let fb_len = fb.end - fb.start;
+
+ let vga_workspace = {
+ let vga_base = with_bar!(bar, |b| vga_workspace_addr(&b, fb_len, chipset,))?;
+
+ vga_base..fb.end
+ };
+
+ let bios = vga_workspace.clone();
+
+ let frts = {
+ const FRTS_DOWN_ALIGN: u64 = 0x20000;
+ const FRTS_SIZE: u64 = 0x100000;
+ let frts_base = align_down(vga_workspace.start, FRTS_DOWN_ALIGN) - FRTS_SIZE;
+
+ frts_base..frts_base + FRTS_SIZE
+ };
+
+ Ok(Self {
+ fb,
+ vga_workspace,
+ bios,
+ frts,
+ })
+ }
+}
+
+/// Returns `true` if the display is disabled.
+fn display_disabled(bar: &Bar0, chipset: Chipset) -> bool {
+ if chipset >= Chipset::GA100 {
+ regs::FuseStatusOptDisplayAmpere::read(bar).display_disabled()
+ } else {
+ regs::FuseStatusOptDisplayMaxwell::read(bar).display_disabled()
+ }
+}
+
+/// Returns the video memory size in bytes.
+fn vidmem_size(bar: &Bar0, chipset: Chipset) -> u64 {
+ if chipset >= Chipset::GA102 {
+ (regs::Pgc6AonSecureScratchGroup42::read(bar).value() as u64) << 20
+ } else {
+ let local_mem_range = regs::PfbPriMmuLocalMemoryRange::read(bar);
+ let size =
+ (local_mem_range.lower_mag() as u64) << ((local_mem_range.lower_scale() as u64) + 20);
+
+ if local_mem_range.ecc_mode_enabled() {
+ size / 16 * 15
+ } else {
+ size
+ }
+ }
+}
+
+/// Returns the vga workspace address.
+fn vga_workspace_addr(bar: &Bar0, fb_size: u64, chipset: Chipset) -> u64 {
+ let base = fb_size - 0x100000;
+ let vga_workspace_base = if display_disabled(bar, chipset) {
+ regs::PdispVgaWorkspaceBase::read(bar)
+ } else {
+ return base;
+ };
+
+ if !vga_workspace_base.status_valid() {
+ return base;
+ }
+
+ let addr = (vga_workspace_base.addr() as u64) << 16;
+ if addr < base {
+ fb_size - 0x20000
+ } else {
+ addr
+ }
+}
diff --git a/drivers/gpu/nova-core/nova_core.rs b/drivers/gpu/nova-core/nova_core.rs
index 2858f4a0dc35eb9d6547d5cbd81de44c8fc47bae..b78a71dea6e10707dc594fdc070b71dbb663e505 100644
--- a/drivers/gpu/nova-core/nova_core.rs
+++ b/drivers/gpu/nova-core/nova_core.rs
@@ -26,6 +26,7 @@ macro_rules! with_bar {
mod falcon;
mod firmware;
mod gpu;
+mod gsp;
mod regs;
mod timer;
mod util;
diff --git a/drivers/gpu/nova-core/regs.rs b/drivers/gpu/nova-core/regs.rs
index c76a16dc8e7267a4eb54cb71e1cca6fb9e00188f..3954542fdd77debd8f96d111ddd231d72dbf5b5a 100644
--- a/drivers/gpu/nova-core/regs.rs
+++ b/drivers/gpu/nova-core/regs.rs
@@ -38,6 +38,12 @@
23:0 adr_63_40 => as u32
);
+register!(PfbPriMmuLocalMemoryRange@...0100ce0;
+ 3:0 lower_scale => as u8;
+ 9:4 lower_mag => as u8;
+ 30:30 ecc_mode_enabled => as_bit bool;
+);
+
/* GC6 */
register!(Pgc6AonSecureScratchGroup05PrivLevelMask@...0118128;
@@ -49,6 +55,27 @@
31:0 value => as u32
);
+register!(Pgc6AonSecureScratchGroup42@...01183a4;
+ 31:0 value => as u32
+);
+
+/* PDISP */
+
+register!(PdispVgaWorkspaceBase@...0625f04;
+ 3:3 status_valid => as_bit bool;
+ 31:8 addr => as u32;
+);
+
+/* FUSE */
+
+register!(FuseStatusOptDisplayMaxwell@...0021c04;
+ 0:0 display_disabled => as_bit bool;
+);
+
+register!(FuseStatusOptDisplayAmpere@...0820c04;
+ 0:0 display_disabled => as_bit bool;
+);
+
/* PFALCON */
register!(FalconIrqsclr@...00000004;
--
2.49.0
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