[PATCH v1 7/7] tcg: add trace events for [exit|goto]_tb and goto_ptr

From: "Alex Bennée" <alex.bennee@linaro.org>
To: qemu-devel@nongnu.org
Cc: "Alex Bennée" <alex.bennee@linaro.org>,
	"Richard Henderson" <richard.henderson@linaro.org>,
	minyihh@uci.edu, robhenry@microsoft.com, vilanova@imperial.ac.uk,
	mahmoudabdalghany@outlook.com, aaron@os.amperecomputing.com,
	cota@braap.org, stefanha@redhat.com, mohamad.gebai@gmail.com,
	kuhn.chenqun@huawei.com, matheus.ferst@eldorado.org.br
Subject: [PATCH v1 7/7] tcg: add trace events for [exit|goto]_tb and goto_ptr
Date: Wed,  5 May 2021 10:22:59 +0100	[thread overview]
Message-ID: <20210505092259.8202-8-alex.bennee@linaro.org> (raw)
In-Reply-To: <20210505092259.8202-1-alex.bennee@linaro.org>

These are generic trace points in common helper functions used by all
front ends. They mainly serve as additional in-tree examples of TCG
trace points and can be used to compare and contrast with getting
similar information from the TCG plugins.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
---
 tcg/tcg-op.c |  8 ++++++++
 trace-events | 12 ++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/tcg/tcg-op.c b/tcg/tcg-op.c
index 70475773f4..46b00f6e9b 100644
--- a/tcg/tcg-op.c
+++ b/tcg/tcg-op.c
@@ -2687,6 +2687,8 @@ void tcg_gen_exit_tb(const TranslationBlock *tb, unsigned idx)
         tcg_debug_assert(idx == TB_EXIT_REQUESTED);
     }
 
+    trace_exit_tb_tcg(val & ~TB_EXIT_MASK, val & TB_EXIT_MASK);
+
     plugin_gen_disable_mem_helpers();
     tcg_gen_op1i(INDEX_op_exit_tb, val);
 }
@@ -2703,6 +2705,9 @@ void tcg_gen_goto_tb(unsigned idx)
     plugin_gen_disable_mem_helpers();
     /* When not chaining, we simply fall through to the "fallback" exit.  */
     if (!qemu_loglevel_mask(CPU_LOG_TB_NOCHAIN)) {
+
+        trace_goto_tb_tcg(idx);
+
         tcg_gen_op1i(INDEX_op_goto_tb, idx);
     }
 }
@@ -2715,6 +2720,9 @@ void tcg_gen_lookup_and_goto_ptr(void)
         plugin_gen_disable_mem_helpers();
         ptr = tcg_temp_new_ptr();
         gen_helper_lookup_tb_ptr(ptr, cpu_env);
+
+        trace_goto_ptr_tcg(ptr);
+
         tcg_gen_op1i(INDEX_op_goto_ptr, tcgv_ptr_arg(ptr));
         tcg_temp_free_ptr(ptr);
     } else {
diff --git a/trace-events b/trace-events
index ac7cef9335..1fcb8c4dda 100644
--- a/trace-events
+++ b/trace-events
@@ -136,6 +136,18 @@ vcpu guest_cpu_reset(void)
 # Targets: TCG(all)
 vcpu tcg guest_mem_before(TCGv vaddr, uint16_t info) "info=%d", "vaddr=0x%016"PRIx64" info=%d"
 
+# Mode: user, softmmu
+# Targets: TCG(all)
+tcg exit_tb(uint64_t ptr, uint64_t idx) "tb=0x%016"PRIx64"/%"PRId64"", "tb=0x%016"PRIx64"/%"PRId64""
+
+# Mode: user, softmmu
+# Targets: TCG(all)
+tcg goto_tb(uint64_t idx) "idx=%"PRId64"", "idx=%"PRId64""
+
+# Mode: user, softmmu
+# Targets: TCG(all)
+tcg goto_ptr(TCGv_ptr ptr) "", "ptr=%p"
+
 # include/user/syscall-trace.h
 
 # @num: System call number.
-- 
2.20.1


