linux-kernel - [PATCH 30/31] gpu: nova-core: Hopper/Blackwell: new location for PCI config mirror

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Message-ID: <20251203055923.1247681-31-jhubbard@nvidia.com>
Date: Tue,  2 Dec 2025 21:59:22 -0800
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 30/31] gpu: nova-core: Hopper/Blackwell: new location for PCI config mirror

Hopper and Blackwell GPUs use a different PCI config mirror base address
(0x092000) compared to earlier architectures (0x088000). Pass the chipset
through to GspSetSystemInfo::init() so it can select the correct address.

Signed-off-by: John Hubbard <jhubbard@...dia.com>
---
 drivers/gpu/nova-core/gsp/boot.rs        |  2 +-
 drivers/gpu/nova-core/gsp/commands.rs    |  8 +++++---
 drivers/gpu/nova-core/gsp/fw/commands.rs | 18 +++++++++++++++---
 3 files changed, 21 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/nova-core/gsp/boot.rs b/drivers/gpu/nova-core/gsp/boot.rs
index 0fbaa73eb55c..084be5586389 100644
--- a/drivers/gpu/nova-core/gsp/boot.rs
+++ b/drivers/gpu/nova-core/gsp/boot.rs
@@ -390,7 +390,7 @@ pub(crate) fn boot(
 
         // Now that GSP is active, send system info and registry
         self.cmdq
-            .send_command(bar, commands::SetSystemInfo::new(pdev))?;
+            .send_command(bar, commands::SetSystemInfo::new(pdev, chipset))?;
         self.cmdq.send_command(bar, commands::SetRegistry::new())?;
 
         if matches!(
diff --git a/drivers/gpu/nova-core/gsp/commands.rs b/drivers/gpu/nova-core/gsp/commands.rs
index 0425c65b5d6f..2a0b796e5927 100644
--- a/drivers/gpu/nova-core/gsp/commands.rs
+++ b/drivers/gpu/nova-core/gsp/commands.rs
@@ -18,6 +18,7 @@
 
 use crate::{
     driver::Bar0,
+    gpu::Chipset,
     gsp::{
         cmdq::{
             Cmdq,
@@ -36,12 +37,13 @@
 /// The `GspSetSystemInfo` command.
 pub(crate) struct SetSystemInfo<'a> {
     pdev: &'a pci::Device<device::Bound>,
+    chipset: Chipset,
 }
 
 impl<'a> SetSystemInfo<'a> {
     /// Creates a new `GspSetSystemInfo` command using the parameters of `pdev`.
-    pub(crate) fn new(pdev: &'a pci::Device<device::Bound>) -> Self {
-        Self { pdev }
+    pub(crate) fn new(pdev: &'a pci::Device<device::Bound>, chipset: Chipset) -> Self {
+        Self { pdev, chipset }
     }
 }
 
@@ -51,7 +53,7 @@ impl<'a> CommandToGsp for SetSystemInfo<'a> {
     type InitError = Error;
 
     fn init(&self) -> impl Init<Self::Command, Self::InitError> {
-        GspSetSystemInfo::init(self.pdev)
+        GspSetSystemInfo::init(self.pdev, self.chipset)
     }
 }
 
diff --git a/drivers/gpu/nova-core/gsp/fw/commands.rs b/drivers/gpu/nova-core/gsp/fw/commands.rs
index 470d8edb62ff..fe8f56ba3e80 100644
--- a/drivers/gpu/nova-core/gsp/fw/commands.rs
+++ b/drivers/gpu/nova-core/gsp/fw/commands.rs
@@ -10,7 +10,13 @@
     }, //
 };
 
-use crate::gsp::GSP_PAGE_SIZE;
+use crate::{
+    gpu::{
+        Architecture,
+        Chipset, //
+    },
+    gsp::GSP_PAGE_SIZE, //
+};
 
 use super::bindings;
 
@@ -24,7 +30,10 @@ pub(crate) struct GspSetSystemInfo {
 impl GspSetSystemInfo {
     /// Returns an in-place initializer for the `GspSetSystemInfo` command.
     #[allow(non_snake_case)]
-    pub(crate) fn init<'a>(dev: &'a pci::Device<device::Bound>) -> impl Init<Self, Error> + 'a {
+    pub(crate) fn init<'a>(
+        dev: &'a pci::Device<device::Bound>,
+        chipset: Chipset,
+    ) -> impl Init<Self, Error> + 'a {
         type InnerGspSystemInfo = bindings::GspSystemInfo;
         let init_inner = try_init!(InnerGspSystemInfo {
             gpuPhysAddr: dev.resource_start(0)?,
@@ -35,7 +44,10 @@ pub(crate) fn init<'a>(dev: &'a pci::Device<device::Bound>) -> impl Init<Self, E
             // Using TASK_SIZE in r535_gsp_rpc_set_system_info() seems wrong because
             // TASK_SIZE is per-task. That's probably a design issue in GSP-RM though.
             maxUserVa: (1 << 47) - 4096,
-            pciConfigMirrorBase: 0x088000,
+            pciConfigMirrorBase: match chipset.arch() {
+                Architecture::Turing | Architecture::Ampere | Architecture::Ada => 0x088000,
+                Architecture::Hopper | Architecture::Blackwell => 0x092000,
+            },
             pciConfigMirrorSize: 0x001000,
 
             PCIDeviceID: (u32::from(dev.device_id()) << 16) | u32::from(dev.vendor_id().as_raw()),
-- 
2.52.0