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[Qemu-devel] [RFC v4 03/28] translate-all: add DEBUG_LOCKING asserts
From: |
Alex Bennée |
Subject: |
[Qemu-devel] [RFC v4 03/28] translate-all: add DEBUG_LOCKING asserts |
Date: |
Thu, 11 Aug 2016 16:23:59 +0100 |
This adds asserts to check the locking on the various translation
engines structures. There are two sets of structures that are protected
by locks.
The first the l1map and PageDesc structures used to track which
translation blocks are associated with which physical addresses. In
user-mode this is covered by the mmap_lock.
The second case are TB context related structures which are protected by
tb_lock which is also user-mode only.
Currently the asserts do nothing in SoftMMU mode but this will change
for MTTCG.
Signed-off-by: Alex Bennée <address@hidden>
Reviewed-by: Richard Henderson <address@hidden>
---
bsd-user/mmap.c | 5 +++++
include/exec/exec-all.h | 1 +
linux-user/mmap.c | 5 +++++
translate-all.c | 41 +++++++++++++++++++++++++++++++++++++++++
4 files changed, 52 insertions(+)
diff --git a/bsd-user/mmap.c b/bsd-user/mmap.c
index 610f91b..ee59073 100644
--- a/bsd-user/mmap.c
+++ b/bsd-user/mmap.c
@@ -42,6 +42,11 @@ void mmap_unlock(void)
}
}
+bool have_mmap_lock(void)
+{
+ return mmap_lock_count > 0 ? true : false;
+}
+
/* Grab lock to make sure things are in a consistent state after fork(). */
void mmap_fork_start(void)
{
diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
index ed5b9c8..d5f29bd 100644
--- a/include/exec/exec-all.h
+++ b/include/exec/exec-all.h
@@ -371,6 +371,7 @@ void tlb_fill(CPUState *cpu, target_ulong addr,
MMUAccessType access_type,
#if defined(CONFIG_USER_ONLY)
void mmap_lock(void);
void mmap_unlock(void);
+bool have_mmap_lock(void);
static inline tb_page_addr_t get_page_addr_code(CPUArchState *env1,
target_ulong addr)
{
diff --git a/linux-user/mmap.c b/linux-user/mmap.c
index c4371d9..19aeec5 100644
--- a/linux-user/mmap.c
+++ b/linux-user/mmap.c
@@ -43,6 +43,11 @@ void mmap_unlock(void)
}
}
+bool have_mmap_lock(void)
+{
+ return mmap_lock_count > 0 ? true : false;
+}
+
/* Grab lock to make sure things are in a consistent state after fork(). */
void mmap_fork_start(void)
{
diff --git a/translate-all.c b/translate-all.c
index b7d5adf..7ab1fd6 100644
--- a/translate-all.c
+++ b/translate-all.c
@@ -31,6 +31,7 @@
#include "tcg.h"
#if defined(CONFIG_USER_ONLY)
#include "qemu.h"
+#include "exec/exec-all.h"
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
#include <sys/param.h>
#if __FreeBSD_version >= 700104
@@ -58,6 +59,7 @@
/* #define DEBUG_TB_INVALIDATE */
/* #define DEBUG_TB_FLUSH */
+/* #define DEBUG_LOCKING */
/* make various TB consistency checks */
/* #define DEBUG_TB_CHECK */
@@ -66,6 +68,28 @@
#undef DEBUG_TB_CHECK
#endif
+/* Access to the various translations structures need to be serialised via
locks
+ * for consistency. This is automatic for SoftMMU based system
+ * emulation due to its single threaded nature. In user-mode emulation
+ * access to the memory related structures are protected with the
+ * mmap_lock.
+ */
+#ifdef DEBUG_LOCKING
+#define DEBUG_MEM_LOCKS 1
+#else
+#define DEBUG_MEM_LOCKS 0
+#endif
+
+#ifdef CONFIG_SOFTMMU
+#define assert_memory_lock() do { /* nothing */ } while (0)
+#else
+#define assert_memory_lock() do { \
+ if (DEBUG_MEM_LOCKS) { \
+ g_assert(have_mmap_lock()); \
+ } \
+ } while (0)
+#endif
+
#define SMC_BITMAP_USE_THRESHOLD 10
typedef struct PageDesc {
@@ -153,6 +177,23 @@ void tb_lock_reset(void)
#endif
}
+#ifdef DEBUG_LOCKING
+#define DEBUG_TB_LOCKS 1
+#else
+#define DEBUG_TB_LOCKS 0
+#endif
+
+#ifdef CONFIG_SOFTMMU
+#define assert_tb_lock() do { /* nothing */ } while (0)
+#else
+#define assert_tb_lock() do { \
+ if (DEBUG_TB_LOCKS) { \
+ g_assert(have_tb_lock); \
+ } \
+ } while (0)
+#endif
+
+
static TranslationBlock *tb_find_pc(uintptr_t tc_ptr);
void cpu_gen_init(void)
--
2.7.4
- [Qemu-devel] [RFC v4 00/28] Base enabling patches for MTTCG, Alex Bennée, 2016/08/11
- [Qemu-devel] [RFC v4 02/28] translate_all: DEBUG_FLUSH -> DEBUG_TB_FLUSH, Alex Bennée, 2016/08/11
- [Qemu-devel] [RFC v4 04/28] cpu-exec: include cpu_index in CPU_LOG_EXEC messages, Alex Bennée, 2016/08/11
- [Qemu-devel] [RFC v4 01/28] cpus: make all_vcpus_paused() return bool, Alex Bennée, 2016/08/11
- [Qemu-devel] [RFC v4 03/28] translate-all: add DEBUG_LOCKING asserts,
Alex Bennée <=
- [Qemu-devel] [RFC v4 05/28] docs: new design document multi-thread-tcg.txt (DRAFTING), Alex Bennée, 2016/08/11
- [Qemu-devel] [RFC v4 08/28] translate-all: Add assert_(memory|tb)_lock annotations, Alex Bennée, 2016/08/11
- [Qemu-devel] [RFC v4 10/28] target-arm/arm-powerctl: wake up sleeping CPUs, Alex Bennée, 2016/08/11
- [Qemu-devel] [RFC v4 07/28] linux-user/elfload: ensure mmap_lock() held while setting up, Alex Bennée, 2016/08/11
- [Qemu-devel] [RFC v4 06/28] tcg: comment on which functions have to be called with tb_lock held, Alex Bennée, 2016/08/11
- [Qemu-devel] [RFC v4 15/28] tcg: rename tcg_current_cpu to tcg_current_rr_cpu, Alex Bennée, 2016/08/11
- [Qemu-devel] [RFC v4 09/28] tcg: protect TBContext with tb_lock., Alex Bennée, 2016/08/11
- [Qemu-devel] [RFC v4 11/28] tcg: move tcg_exec_all and helpers above thread fn, Alex Bennée, 2016/08/11
- [Qemu-devel] [RFC v4 14/28] tcg: add kick timer for single-threaded vCPU emulation, Alex Bennée, 2016/08/11
- [Qemu-devel] [RFC v4 12/28] tcg: cpus rm tcg_exec_all(), Alex Bennée, 2016/08/11