linux-kernel - [PATCH 2/2] nova-core: remove unnecessary need

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Message-ID: <20251025014050.585153-3-jhubbard@nvidia.com>
Date: Fri, 24 Oct 2025 18:40:50 -0700
From: John Hubbard <jhubbard@...dia.com>
To: Danilo Krummrich <dakr@...nel.org>
Cc: Alexandre Courbot <acourbot@...dia.com>,
	Joel Fernandes <joelagnelf@...dia.com>,
	Timur Tabi <ttabi@...dia.com>,
	Alistair Popple <apopple@...dia.com>,
	Edwin Peer <epeer@...dia.com>,
	Zhi Wang <zhiw@...dia.com>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	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 <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Trevor Gross <tmgross@...ch.edu>,
	nouveau@...ts.freedesktop.org,
	rust-for-linux@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	John Hubbard <jhubbard@...dia.com>
Subject: [PATCH 2/2] nova-core: remove unnecessary need_riscv, bar parameters

The need_riscv parameter and its associated RISCV validation logic are
are actually unnecessary for correct operation. Remove it, along with
the now-unused bar parameter as well.

Signed-off-by: John Hubbard <jhubbard@...dia.com>
---
 drivers/gpu/nova-core/falcon.rs | 21 +--------------------
 drivers/gpu/nova-core/gpu.rs    |  4 +---
 2 files changed, 2 insertions(+), 23 deletions(-)

diff --git a/drivers/gpu/nova-core/falcon.rs b/drivers/gpu/nova-core/falcon.rs
index ac55cbc5ac1e..d745afacfc40 100644
--- a/drivers/gpu/nova-core/falcon.rs
+++ b/drivers/gpu/nova-core/falcon.rs
@@ -362,26 +362,7 @@ pub(crate) struct Falcon<E: FalconEngine> {
 
 impl<E: FalconEngine + 'static> Falcon<E> {
     /// Create a new falcon instance.
-    ///
-    /// `need_riscv` is set to `true` if the caller expects the falcon to be a dual falcon/riscv
-    /// controller.
-    pub(crate) fn new(
-        dev: &device::Device,
-        chipset: Chipset,
-        bar: &Bar0,
-        need_riscv: bool,
-    ) -> Result<Self> {
-        if need_riscv {
-            let hwcfg2 = regs::NV_PFALCON_FALCON_HWCFG2::read(bar, &E::ID);
-            if !hwcfg2.riscv() {
-                dev_err!(
-                    dev,
-                    "riscv support requested on a controller that does not support it\n"
-                );
-                return Err(EINVAL);
-            }
-        }
-
+    pub(crate) fn new(dev: &device::Device, chipset: Chipset) -> Result<Self> {
         Ok(Self {
             hal: hal::falcon_hal(chipset)?,
             dev: dev.into(),
diff --git a/drivers/gpu/nova-core/gpu.rs b/drivers/gpu/nova-core/gpu.rs
index af20e2daea24..9d182bffe8b4 100644
--- a/drivers/gpu/nova-core/gpu.rs
+++ b/drivers/gpu/nova-core/gpu.rs
@@ -213,12 +213,10 @@ pub(crate) fn new<'a>(
             gsp_falcon: Falcon::new(
                 pdev.as_ref(),
                 spec.chipset,
-                bar,
-                spec.chipset > Chipset::GA100,
             )
             .inspect(|falcon| falcon.clear_swgen0_intr(bar))?,
 
-            sec2_falcon: Falcon::new(pdev.as_ref(), spec.chipset, bar, true)?,
+            sec2_falcon: Falcon::new(pdev.as_ref(), spec.chipset)?,
 
             gsp <- Gsp::new(),
 
-- 
2.51.1