[PATCH v5 06/38] gpu: nova-core: factor .fwsignature* selection into a new find_gsp_sigs_section()

[John Hubbard <jhubbard@nvidia.com>]

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 | 60 ++++++++++++++-------------
 1 file changed, 31 insertions(+), 29 deletions(-)

diff --git a/drivers/gpu/nova-core/firmware/gsp.rs b/drivers/gpu/nova-core/firmware/gsp.rs
index bc2243450989..468f4b43574a 100644
--- a/drivers/gpu/nova-core/firmware/gsp.rs
+++ b/drivers/gpu/nova-core/firmware/gsp.rs
@@ -146,6 +146,36 @@ 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 => {
+                // Distinguish between GB10x and GB20x series
+                match chipset {
+                    // GB10x series: GB100, GB102
+                    Chipset::GB100 | Chipset::GB102 => Some(".fwsignature_gb10x"),
+                    // GB20x series: GB202, GB203, GB205, GB206, GB207
+                    Chipset::GB202
+                    | Chipset::GB203
+                    | Chipset::GB205
+                    | Chipset::GB206
+                    | Chipset::GB207 => Some(".fwsignature_gb20x"),
+                    // It's not possible to get here with a non-Blackwell chipset, but Rust doesn't
+                    // know that.
+                    _ => None,
+                }
+            }
+        }
+    }
+
     /// 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>(
@@ -211,35 +241,7 @@ 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 => {
-                            // Distinguish between GB10x and GB20x series
-                            match chipset {
-                                // GB10x series: GB100, GB102
-                                Chipset::GB100 | Chipset::GB102 => ".fwsignature_gb10x",
-                                // GB20x series: GB202, GB203, GB205, GB206, GB207
-                                Chipset::GB202
-                                | Chipset::GB203
-                                | Chipset::GB205
-                                | Chipset::GB206
-                                | Chipset::GB207 => ".fwsignature_gb20x",
-                                // It's not possible to get here with a non-Blackwell chipset, but
-                                // Rust doesn't know that.
-                                _ => return Err(ENOTSUPP),
-                            }
-                        }
-                    };
+                    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