Keep Gsp::new() from getting too cluttered, by factoring out the
selection of .fwsignature* items. This will continue to grow as we add
GPUs.

Cc: Danilo Krummrich <dakr@kernel.org>
Reviewed-by: Gary Guo <gary@garyguo.net>
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
---
 drivers/gpu/nova-core/firmware/gsp.rs | 36 ++++++++++++++-------------
 1 file changed, 19 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/nova-core/firmware/gsp.rs b/drivers/gpu/nova-core/firmware/gsp.rs
index c1f0a606f5c0..8bbc3809c640 100644
--- a/drivers/gpu/nova-core/firmware/gsp.rs
+++ b/drivers/gpu/nova-core/firmware/gsp.rs
@@ -146,6 +146,24 @@ pub(crate) struct GspFirmware {
 }
 
 impl GspFirmware {
+    fn find_gsp_sigs_section(chipset: Chipset) -> Option<&'static str> {
+        match chipset.arch() {
+            Architecture::Turing if matches!(chipset, Chipset::TU116 | Chipset::TU117) => {
+                Some(".fwsignature_tu11x")
+            }
+            Architecture::Turing => Some(".fwsignature_tu10x"),
+            // GA100 uses the same firmware as Turing
+            Architecture::Ampere if chipset == Chipset::GA100 => Some(".fwsignature_tu10x"),
+            Architecture::Ampere => Some(".fwsignature_ga10x"),
+            Architecture::Ada => Some(".fwsignature_ad10x"),
+            Architecture::Hopper => Some(".fwsignature_gh10x"),
+            Architecture::Blackwell if matches!(chipset, Chipset::GB100 | Chipset::GB102) => {
+                Some(".fwsignature_gb10x")
+            }
+            Architecture::Blackwell => Some(".fwsignature_gb20x"),
+        }
+    }
+
     /// Loads the GSP firmware binaries, map them into `dev`'s address-space, and creates the page
     /// tables expected by the GSP bootloader to load it.
     pub(crate) fn new<'a>(
@@ -211,23 +229,7 @@ pub(crate) fn new<'a>(
                 },
                 size,
                 signatures: {
-                    let sigs_section = match chipset.arch() {
-                        Architecture::Turing
-                            if matches!(chipset, Chipset::TU116 | Chipset::TU117) => {
-                            ".fwsignature_tu11x"
-                        }
-                        Architecture::Turing => ".fwsignature_tu10x",
-                        // GA100 uses the same firmware as Turing
-                        Architecture::Ampere if chipset == Chipset::GA100 => ".fwsignature_tu10x",
-                        Architecture::Ampere => ".fwsignature_ga10x",
-                        Architecture::Ada => ".fwsignature_ad10x",
-                        Architecture::Hopper => ".fwsignature_gh10x",
-                        Architecture::Blackwell
-                            if matches!(chipset, Chipset::GB100 | Chipset::GB102) => {
-                            ".fwsignature_gb10x"
-                        }
-                        Architecture::Blackwell => ".fwsignature_gb20x",
-                    };
+                    let sigs_section = Self::find_gsp_sigs_section(chipset).ok_or(ENOTSUPP)?;
 
                     elf::elf64_section(firmware.data(), sigs_section)
                         .ok_or(EINVAL)
-- 
2.53.0