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authorJan Kiszka <jan.kiszka@siemens.com>2015-06-18 18:47:20 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2015-07-01 15:45:50 +0200
commit196ea13104f802c508e57180b2a0d2b3418989a3 (patch)
tree60167787abeca65610b7f64c5e7c8300a33982a3 /include/exec
parentafbe70535ff1a8a7a32910cc15ebecc0ba92e7da (diff)
memory: Add global-locking property to memory regions
This introduces the memory region property "global_locking". It is true by default. By setting it to false, a device model can request BQL-free dispatching of region accesses to its r/w handlers. The actual BQL break-up will be provided in a separate patch. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Cc: Frederic Konrad <fred.konrad@greensocs.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <1434646046-27150-4-git-send-email-pbonzini@redhat.com>
Diffstat (limited to 'include/exec')
-rw-r--r--include/exec/memory.h26
1 files changed, 26 insertions, 0 deletions
diff --git a/include/exec/memory.h b/include/exec/memory.h
index 8ae004eb06..0ebdc55506 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -180,6 +180,7 @@ struct MemoryRegion {
bool rom_device;
bool warning_printed; /* For reservations */
bool flush_coalesced_mmio;
+ bool global_locking;
MemoryRegion *alias;
hwaddr alias_offset;
int32_t priority;
@@ -825,6 +826,31 @@ void memory_region_set_flush_coalesced(MemoryRegion *mr);
void memory_region_clear_flush_coalesced(MemoryRegion *mr);
/**
+ * memory_region_set_global_locking: Declares the access processing requires
+ * QEMU's global lock.
+ *
+ * When this is invoked, accesses to the memory region will be processed while
+ * holding the global lock of QEMU. This is the default behavior of memory
+ * regions.
+ *
+ * @mr: the memory region to be updated.
+ */
+void memory_region_set_global_locking(MemoryRegion *mr);
+
+/**
+ * memory_region_clear_global_locking: Declares that access processing does
+ * not depend on the QEMU global lock.
+ *
+ * By clearing this property, accesses to the memory region will be processed
+ * outside of QEMU's global lock (unless the lock is held on when issuing the
+ * access request). In this case, the device model implementing the access
+ * handlers is responsible for synchronization of concurrency.
+ *
+ * @mr: the memory region to be updated.
+ */
+void memory_region_clear_global_locking(MemoryRegion *mr);
+
+/**
* memory_region_add_eventfd: Request an eventfd to be triggered when a word
* is written to a location.
*