Gabe Black has uploaded this change for review. (
https://gem5-review.googlesource.com/c/public/gem5/+/17589
Change subject: mem: Add a MemBackdoor type to track memory backdoors.
......................................................................
mem: Add a MemBackdoor type to track memory backdoors.
These are similar to the structures TLM's DMI mechanism uses. Instead
of having an invalidation broadcast which propogates backwards up the
port hierarchy, this mechanism tracks a set of callbacks which are
triggered when a back door is invalidated to let other holders clean
up their bookkeeping.
Change-Id: If24489258dcaee14d7b6e5b996dfb1c2636f26ab
---
A src/mem/backdoor.hh
1 file changed, 134 insertions(+), 0 deletions(-)
diff --git a/src/mem/backdoor.hh b/src/mem/backdoor.hh
new file mode 100644
index 0000000..031bd5d
--- /dev/null
+++ b/src/mem/backdoor.hh
@@ -0,0 +1,134 @@
+/*
+ * Copyright 2019 Google, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Gabe Black
+ */
+
+#ifndef __MEM_BACKDOOR_HH__
+#define __MEM_BACKDOOR_HH__
+
+#include <cstdint>
+#include <functional>
+
+#include "base/addr_range.hh"
+#include "base/callback.hh"
+
+class MemBackdoor
+{
+ public:
+ typedef std::function<void(const MemBackdoor &backdoor)> CbFunction;
+
+ private:
+ class Callback : public ::Callback
+ {
+ public:
+ Callback(MemBackdoor &bd, CbFunction cb) :
+ _backdoor(bd), cbFunction(cb)
+ {}
+
+ void process() override { cbFunction(_backdoor); }
+ void autoDestruct() override { delete this; }
+
+ MemBackdoor &backdoor() { return _backdoor; }
+
+ private:
+ MemBackdoor &_backdoor;
+ CbFunction cbFunction;
+ };
+
+ public:
+ enum Flags{
+ NoAccess = 0x0,
+ Readable = 0x1,
+ Writeable = 0x2
+ };
+
+ const AddrRange &range() const { return _range; }
+ void range(const AddrRange &r) { _range = r; }
+
+ uint8_t *ptr() const { return _ptr; }
+ void ptr(uint8_t *p) { _ptr = p; }
+
+ bool readable() const { return _flags & Readable; }
+ void
+ readable(bool r)
+ {
+ if (r)
+ _flags = (Flags)(_flags | Readable);
+ else
+ _flags = (Flags)(_flags & ~Readable);
+ }
+
+ bool writeable() const { return _flags & Writeable; }
+ void
+ writeable(bool w)
+ {
+ if (w)
+ _flags = (Flags)(_flags | Writeable);
+ else
+ _flags = (Flags)(_flags & ~Writeable);
+ }
+
+ Flags flags() const { return _flags; }
+ void flags(Flags f) { _flags = f; }
+
+ MemBackdoor(AddrRange r, uint8_t *p, Flags flags) :
+ invalidationCallbacks(new CallbackQueue),
+ _range(r), _ptr(p), _flags(flags)
+ {}
+
+ MemBackdoor() : MemBackdoor(AddrRange(), nullptr, NoAccess)
+ {}
+
+ void
+ addInvalidationCallback(CbFunction func)
+ {
+ auto *cb = new MemBackdoor::Callback(*this, func);
+ assert(cb);
+ invalidationCallbacks->add(cb);
+ }
+
+ void
+ invalidate()
+ {
+ invalidationCallbacks->process();
+ // Delete and recreate the callback queue to ensure the callback
+ // objects are deleted.
+ delete invalidationCallbacks;
+ invalidationCallbacks = new CallbackQueue;
+ }
+
+ private:
+ CallbackQueue *invalidationCallbacks;
+
+ AddrRange _range;
+ uint8_t *_ptr;
+ Flags _flags;
+};
+
+typedef MemBackdoor *MemBackdoorPtr;
+
+#endif //__MEM_BACKDOOR_HH__
--
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Gerrit-Project: public/gem5
Gerrit-Branch: master
Gerrit-Change-Id: If24489258dcaee14d7b6e5b996dfb1c2636f26ab
Gerrit-Change-Number: 17589
Gerrit-PatchSet: 1
Gerrit-Owner: Gabe Black <gabebl...@google.com>
Gerrit-MessageType: newchange
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