[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [RFC v1 1/3] bouce buffer has fine grain lock
From: |
Liu Ping Fan |
Subject: |
[Qemu-devel] [RFC v1 1/3] bouce buffer has fine grain lock |
Date: |
Fri, 9 Nov 2012 11:14:28 +0800 |
From: Liu Ping Fan <address@hidden>
Signed-off-by: Liu Ping Fan <address@hidden>
---
exec.c | 21 +++++++++++++--------
1 files changed, 13 insertions(+), 8 deletions(-)
diff --git a/exec.c b/exec.c
index 73d5242..fe84718 100644
--- a/exec.c
+++ b/exec.c
@@ -3296,6 +3296,15 @@ void address_space_destroy_dispatch(AddressSpace *as)
as->dispatch = NULL;
}
+typedef struct {
+ QemuMutex lock;
+ void *buffer;
+ target_phys_addr_t addr;
+ target_phys_addr_t len;
+} BounceBuffer;
+
+static BounceBuffer bounce;
+
static void memory_map_init(void)
{
system_memory = g_malloc(sizeof(*system_memory));
@@ -3308,6 +3317,8 @@ static void memory_map_init(void)
address_space_init(&address_space_io, system_io);
address_space_io.name = "I/O";
+ qemu_mutex_init(&bounce.lock);
+
memory_listener_register(&core_memory_listener, &address_space_memory);
memory_listener_register(&io_memory_listener, &address_space_io);
memory_listener_register(&tcg_memory_listener, &address_space_memory);
@@ -3671,14 +3682,6 @@ void cpu_physical_memory_write_rom(target_phys_addr_t
addr,
}
}
-typedef struct {
- void *buffer;
- target_phys_addr_t addr;
- target_phys_addr_t len;
-} BounceBuffer;
-
-static BounceBuffer bounce;
-
typedef struct MapClient {
void *opaque;
void (*callback)(void *opaque);
@@ -3747,6 +3750,7 @@ void *address_space_map(AddressSpace *as,
section = &mr_obj;
if (!(memory_region_is_ram(section->mr) && !section->readonly)) {
+ qemu_mutex_lock(&bounce.lock);
if (todo || bounce.buffer) {
break;
}
@@ -3807,6 +3811,7 @@ void address_space_unmap(AddressSpace *as, void *buffer,
target_phys_addr_t len,
}
qemu_vfree(bounce.buffer);
bounce.buffer = NULL;
+ qemu_mutex_unlock(&bounce.lock);
cpu_notify_map_clients();
}
--
1.7.4.4
[Qemu-devel] [RFC v1 3/3] make address_space_map safe, Liu Ping Fan, 2012/11/08