Remove perf feature of OpenSK (#930)

It only works in debug mode. Instead we rely on external measurements
(e.g. using tcpdump with usbmon). It is enough to measure GetInfo so no
need to bypass user interaction.

Author: ia0

examples/rust/opensk/Cargo.toml

@@ -39,7 +39,6 @@ debug = ["opensk-lib/debug_ctap"]
 ed25519 = ["opensk-lib/ed25519", "wasefire/api-crypto-ed25519"]
 fingerprint = ["dep:wasefire-common", "opensk-lib/fingerprint", "wasefire/api-fingerprint-matcher"]
 led-1 = []
-perf = []
 test = ["opensk-lib/std", "wasefire/test"]
 
 [lints]

examples/rust/opensk/src/lib.rs

@@ -30,23 +30,6 @@ mod env;
 mod touch;
 
 fn main() -> ! {
-    #[cfg(feature = "perf")]
-    {
-        struct Us(u64);
-        impl core::fmt::Display for Us {
-            fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
-                write!(f, "{}.{:06}", self.0 / 1_000_000, self.0 % 1_000_000)
-            }
-        }
-        let prev = core::cell::Cell::new(debug::perf());
-        let timer = timer::Timer::new(move || {
-            let next = debug::perf();
-            let diff = next - prev.replace(next);
-            debug!("Perf: P={} A={} W={}", Us(diff.platform), Us(diff.applets), Us(diff.waiting));
-        });
-        timer.start_ms(timer::Periodic, 5_000);
-        timer.leak()
-    }
     let mut opensk_ctap = opensk_lib::Ctap::new(env::init());
     let mut wink: Option<blink::Blink> = None;
     #[cfg(feature = "ctap1")]

examples/rust/opensk/test.sh

@@ -25,5 +25,4 @@ cargo check --lib --target=wasm32-unknown-unknown --features=debug
 cargo check --lib --target=wasm32-unknown-unknown --features=ed25519
 cargo check --lib --target=wasm32-unknown-unknown --features=fingerprint
 cargo check --lib --target=wasm32-unknown-unknown --features=led-1
-cargo check --lib --target=wasm32-unknown-unknown --features=perf
 cargo test --lib --features=test