Merge tag 'tracing-pull-request' of https://gitlab.com/stefanha/qemu into staging

Pull request

Tanish Desai and Paolo Bonzini's tracing Rust support.

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* tag 'tracing-pull-request' of https://gitlab.com/stefanha/qemu:
  tracetool/syslog: add Rust support
  tracetool/ftrace: add Rust support
  tracetool/log: add Rust support
  log: change qemu_loglevel to unsigned
  tracetool/simple: add Rust support
  rust: pl011: add tracepoints
  rust: qdev: add minimal clock bindings
  rust: add trace crate
  tracetool: Add Rust format support
  tracetool/backend: remove redundant trace event checks
  tracetool: add CHECK_TRACE_EVENT_GET_STATE
  trace/ftrace: move snprintf+write from tracepoints to ftrace.c
  tracetool: add SPDX headers
  treewide: remove unnessary "coding" header
  tracetool: remove dead code
  tracetool: fix usage of try_import()

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

3 files changed, 77 insertions, 0 deletions

diff --git a/rust/trace/Cargo.toml b/rust/trace/Cargo.toml
new file mode 100644
index 0000000000..fc81bce580
--- /dev/null
+++ b/rust/trace/Cargo.toml
@@ -0,0 +1,19 @@
+[package]
+name = "trace"
+version = "0.1.0"
+authors = ["Tanish Desai <tanishdesai37@gmail.com>"]
+description = "QEMU tracing infrastructure support"
+resolver = "2"
+publish = false
+
+edition.workspace = true
+homepage.workspace = true
+license.workspace = true
+repository.workspace = true
+rust-version.workspace = true
+
+[dependencies]
+libc = { workspace = true }
+
+[lints]
+workspace = true
diff --git a/rust/trace/meson.build b/rust/trace/meson.build
new file mode 100644
index 0000000000..adca57e550
--- /dev/null
+++ b/rust/trace/meson.build
@@ -0,0 +1,19 @@
+rust = import('rust')
+
+lib_rs = configure_file(
+  input: 'src/lib.rs',
+  output: 'lib.rs',
+  configuration: {
+    'MESON_BUILD_ROOT': meson.project_build_root(),
+  })
+
+_trace_rs = static_library(
+  'trace',             # Library name,
+  lib_rs,
+  trace_rs_targets,         # List of generated `.rs` custom targets
+  override_options: ['rust_std=2021', 'build.rust_std=2021'],
+  dependencies: [libc_rs],
+  rust_abi: 'rust',
+)
+
+trace_rs = declare_dependency(link_with: _trace_rs)
diff --git a/rust/trace/src/lib.rs b/rust/trace/src/lib.rs
new file mode 100644
index 0000000000..e03bce43c4
--- /dev/null
+++ b/rust/trace/src/lib.rs
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+//! This crate provides macros that aid in using QEMU's tracepoint
+//! functionality.
+
+#[doc(hidden)]
+/// Re-exported item to avoid adding libc as a dependency everywhere.
+pub use libc::{syslog, LOG_INFO};
+
+#[macro_export]
+/// Define the trace-points from the named directory (which should have slashes
+/// replaced by underscore characters) as functions in a module called `trace`.
+///
+/// ```ignore
+/// ::trace::include_trace!("hw_char");
+/// // ...
+/// trace::trace_pl011_read_fifo_rx_full();
+/// ```
+macro_rules! include_trace {
+    ($name:literal) => {
+        #[allow(
+            clippy::ptr_as_ptr,
+            clippy::cast_lossless,
+            clippy::used_underscore_binding
+        )]
+        mod trace {
+            #[cfg(not(MESON))]
+            include!(concat!(
+                env!("MESON_BUILD_ROOT"),
+                "/trace/trace-",
+                $name,
+                ".rs"
+            ));
+
+            #[cfg(MESON)]
+            include!(concat!("@MESON_BUILD_ROOT@/trace/trace-", $name, ".rs"));
+        }
+    };
+}