gimlet-seq: count I2C error codes (#1630)

This commit adds `#[count(children)]` to the `Trace::I2cFault` variant
in `gimlet-seq`.

drv/gimlet-seq-server/src/main.rs

@@ -107,6 +107,7 @@ enum Trace {
     SpdDimmsFound(usize),
     I2cFault {
         retries_remaining: u8,
+        #[count(children)]
         code: i2c::ResponseCode,
     },
     StartFailed(#[count(children)] SeqError),

drv/i2c-types/Cargo.toml

@@ -12,3 +12,7 @@ serde.workspace = true
 enum-kinds.workspace = true
 
 derive-idol-err.path = "../../lib/derive-idol-err"
+counters.path = "../../lib/counters"
+
+[build-dependencies]
+build-util.path = "../../build/util"

drv/i2c-types/build.rs

@@ -0,0 +1,9 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+fn main() {
+    if let Err(e) = build_util::expose_m_profile() {
+        println!("cargo:warning={e}");
+    }
+}

drv/i2c-types/src/lib.rs

@@ -54,8 +54,9 @@ pub enum Op {
     Serialize,
     Deserialize,
     SerializedSize,
+    counters::Count,
 )]
-#[enum_kind(ResponseCodeU8)]
+#[enum_kind(ResponseCodeU8, derive(counters::Count))]
 #[repr(u32)]
 pub enum ResponseCode {
     /// Bad response from server

lib/counters/derive/src/lib.rs

@@ -118,7 +118,7 @@ impl<'input> CountGenerator<'input> {
                 };
 
                 fn count(&self, counters: &Self::Counters) {
-                    #[cfg(armv6m)]
+                    #[cfg(all(target_arch = "arm", armv6m))]
                     use counters::armv6m_atomic_hack::AtomicU32Ext;
 
                     match self {