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| author | Steve Reinhardt <stever@gmail.com> | 2008-01-02 15:22:38 -0800 |
|---|---|---|
| committer | Steve Reinhardt <stever@gmail.com> | 2008-01-02 15:22:38 -0800 |
| commit | 6c5a3ab8b28ae14e1f1c37076b7370b37c70de62 (patch) | |
| tree | d89626ebae1a7b4a14f41fe6b33d01dbcb78bdc2 /src/mem/packet.cc | |
| parent | bf9b3821bda5f534a44b176c0ed738a17cb9b80a (diff) | |
| download | gem5-6c5a3ab8b28ae14e1f1c37076b7370b37c70de62.tar.xz | |
Add ReadRespWithInvalidate to handle multi-level coherence situation
where we defer a response to a read from a far-away cache A, then later
defer a ReadExcl from a cache B on the same bus as us. We'll assert
MemInhibit in both cases, but in the latter case MemInhibit will keep
the invalidation from reaching cache A. This special response tells
cache A that it gets the block to satisfy its read, but must immediately
invalidate it.
--HG--
extra : convert_revision : f85c8b47bb30232da37ac861b50a6539dc81161b
Diffstat (limited to 'src/mem/packet.cc')
| -rw-r--r-- | src/mem/packet.cc | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/src/mem/packet.cc b/src/mem/packet.cc index 164363860..f3bd06f36 100644 --- a/src/mem/packet.cc +++ b/src/mem/packet.cc @@ -59,6 +59,9 @@ MemCmd::commandInfo[] = { SET3(IsRead, IsRequest, NeedsResponse), ReadResp, "ReadReq" }, /* ReadResp */ { SET3(IsRead, IsResponse, HasData), InvalidCmd, "ReadResp" }, + /* ReadRespWithInvalidate */ + { SET4(IsRead, IsResponse, HasData, IsInvalidate), + InvalidCmd, "ReadRespWithInvalidate" }, /* WriteReq */ { SET5(IsWrite, NeedsExclusive, IsRequest, NeedsResponse, HasData), WriteResp, "WriteReq" }, @@ -84,19 +87,19 @@ MemCmd::commandInfo[] = IsRequest, HasData, NeedsResponse), WriteInvalidateResp, "WriteInvalidateReq" }, /* WriteInvalidateResp */ - { SET4(IsWrite, NeedsExclusive, IsInvalidate, IsResponse), + { SET3(IsWrite, NeedsExclusive, IsResponse), InvalidCmd, "WriteInvalidateResp" }, /* UpgradeReq */ { SET4(IsInvalidate, NeedsExclusive, IsRequest, NeedsResponse), UpgradeResp, "UpgradeReq" }, /* UpgradeResp */ - { SET3(IsInvalidate, NeedsExclusive, IsResponse), + { SET2(NeedsExclusive, IsResponse), InvalidCmd, "UpgradeResp" }, /* ReadExReq */ { SET5(IsRead, NeedsExclusive, IsInvalidate, IsRequest, NeedsResponse), ReadExResp, "ReadExReq" }, /* ReadExResp */ - { SET5(IsRead, NeedsExclusive, IsInvalidate, IsResponse, HasData), + { SET4(IsRead, NeedsExclusive, IsResponse, HasData), InvalidCmd, "ReadExResp" }, /* LoadLockedReq */ { SET4(IsRead, IsLocked, IsRequest, NeedsResponse), |