linux-kernel - [PATCH v3 04/19] gpu: nova-core: take bound device in Gpu::new

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Message-Id: <20250507-nova-frts-v3-4-fcb02749754d@nvidia.com>
Date: Wed, 07 May 2025 22:52:31 +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 v3 04/19] gpu: nova-core: take bound device in Gpu::new

We will need to perform things like allocating DMA memory during device
creation, so make sure to take the device context that will allow us to
perform these actions. This also allows us to use Devres::access to
obtain the BAR without holding a RCU lock.

Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
---
 drivers/gpu/nova-core/gpu.rs | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/nova-core/gpu.rs b/drivers/gpu/nova-core/gpu.rs
index 9fe6aedaa9563799c2624d461d4e37ee9b094909..a64a306e0ec87f96e7aab47cfe00a5c280c95a64 100644
--- a/drivers/gpu/nova-core/gpu.rs
+++ b/drivers/gpu/nova-core/gpu.rs
@@ -134,9 +134,8 @@ pub(crate) struct Spec {
 }
 
 impl Spec {
-    fn new(bar: &Devres<Bar0>) -> Result<Spec> {
-        let bar = bar.try_access().ok_or(ENXIO)?;
-        let boot0 = regs::Boot0::read(&bar);
+    fn new(bar: &Bar0) -> Result<Spec> {
+        let boot0 = regs::Boot0::read(bar);
 
         Ok(Self {
             chipset: boot0.chipset().try_into()?,
@@ -183,8 +182,12 @@ pub(crate) struct Gpu {
 }
 
 impl Gpu {
-    pub(crate) fn new(pdev: &pci::Device, bar: Devres<Bar0>) -> Result<impl PinInit<Self>> {
-        let spec = Spec::new(&bar)?;
+    pub(crate) fn new(
+        pdev: &pci::Device<device::Bound>,
+        devres_bar: Devres<Bar0>,
+    ) -> Result<impl PinInit<Self>> {
+        let bar = devres_bar.access(pdev.as_ref())?;
+        let spec = Spec::new(bar)?;
         let fw = Firmware::new(pdev.as_ref(), &spec, "535.113.01")?;
 
         dev_info!(
@@ -195,6 +198,10 @@ pub(crate) fn new(pdev: &pci::Device, bar: Devres<Bar0>) -> Result<impl PinInit<
             spec.revision
         );
 
-        Ok(pin_init!(Self { spec, bar, fw }))
+        Ok(pin_init!(Self {
+            spec,
+            bar: devres_bar,
+            fw
+        }))
     }
 }

-- 
2.49.0