[PATCH v2 05/30] gpu: nova-core: use GPU Architecture to simplify HAL selections

[John Hubbard <jhubbard@nvidia.com>]

Instead of long, exhaustive lists of GPUs ("Chipsets"), use entire
GPU Architectures, such as "Blackwell" or "Turing", to make HAL choices.

Note: Left a // TODO for GA100, hinting at the remaining work in order
to bring up that chipset.

A tiny side effect: moved a "use" statement out of function scope, in
each file, up to the top of the file, as per Rust for Linux conventions.

Signed-off-by: John Hubbard <jhubbard@nvidia.com>
---
 drivers/gpu/nova-core/falcon/hal.rs | 21 +++++++++++++--------
 drivers/gpu/nova-core/fb/hal.rs     | 17 +++++++++--------
 2 files changed, 22 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/nova-core/falcon/hal.rs b/drivers/gpu/nova-core/falcon/hal.rs
index 444c95fd4ece..edf4d27d54f7 100644
--- a/drivers/gpu/nova-core/falcon/hal.rs
+++ b/drivers/gpu/nova-core/falcon/hal.rs
@@ -9,7 +9,10 @@
         FalconBromParams,
         FalconEngine, //
     },
-    gpu::Chipset,
+    gpu::{
+        Architecture,
+        Chipset, //
+    },
 };
 
 mod ga102;
@@ -70,17 +73,19 @@ fn signature_reg_fuse_version(
 pub(super) fn falcon_hal<E: FalconEngine + 'static>(
     chipset: Chipset,
 ) -> Result<KBox<dyn FalconHal<E>>> {
-    use Chipset::*;
-
-    let hal = match chipset {
-        TU102 | TU104 | TU106 | TU116 | TU117 => {
+    let hal = match chipset.arch() {
+        Architecture::Turing => {
             KBox::new(tu102::Tu102::<E>::new(), GFP_KERNEL)? as KBox<dyn FalconHal<E>>
         }
-        GA102 | GA103 | GA104 | GA106 | GA107 | AD102 | AD103 | AD104 | AD106 | AD107 | GH100
-        | GB100 | GB102 | GB202 | GB203 | GB205 | GB206 | GB207 => {
+        // TODO: support GA100. Its boot sequence is a lot like Turing, except that it handles the
+        // FRTS steps differently (specifically, it skips FWSEC-FRTS).
+        Architecture::Ampere if chipset == Chipset::GA100 => return Err(ENOTSUPP),
+        Architecture::Ampere
+        | Architecture::Hopper
+        | Architecture::Ada
+        | Architecture::Blackwell => {
             KBox::new(ga102::Ga102::<E>::new(), GFP_KERNEL)? as KBox<dyn FalconHal<E>>
         }
-        _ => return Err(ENOTSUPP),
     };
 
     Ok(hal)
diff --git a/drivers/gpu/nova-core/fb/hal.rs b/drivers/gpu/nova-core/fb/hal.rs
index 71fa92d1b709..d795ef7ee65d 100644
--- a/drivers/gpu/nova-core/fb/hal.rs
+++ b/drivers/gpu/nova-core/fb/hal.rs
@@ -4,7 +4,10 @@
 
 use crate::{
     driver::Bar0,
-    gpu::Chipset, //
+    gpu::{
+        Architecture,
+        Chipset, //
+    },
 };
 
 mod ga100;
@@ -29,12 +32,10 @@ pub(crate) trait FbHal {
 
 /// Returns the HAL corresponding to `chipset`.
 pub(super) fn fb_hal(chipset: Chipset) -> &'static dyn FbHal {
-    use Chipset::*;
-
-    match chipset {
-        TU102 | TU104 | TU106 | TU117 | TU116 => tu102::TU102_HAL,
-        GA100 => ga100::GA100_HAL,
-        GA102 | GA103 | GA104 | GA106 | GA107 | GH100 | AD102 | AD103 | AD104 | AD106 | AD107
-        | GB100 | GB102 | GB202 | GB203 | GB205 | GB206 | GB207 => ga102::GA102_HAL,
+    match chipset.arch() {
+        Architecture::Turing => tu102::TU102_HAL,
+        Architecture::Ampere if chipset == Chipset::GA100 => ga100::GA100_HAL,
+        Architecture::Ampere => ga102::GA102_HAL,
+        Architecture::Hopper | Architecture::Ada | Architecture::Blackwell => ga102::GA102_HAL,
     }
 }
-- 
2.52.0