dev-arm: Perform SMMUv3 CFG Invalidation at device interface

In the current SMMUv3 model, multiple micro/mainTLB are present at the
device interface (SMMUv3SlaveInterface), caching translations specific
to a device.
Those distributed TLBs are checked for a translation before checking for
centralized TLBs (shared by devices), like the configuration cache, walk
cache etc.  This means that if a hit in these TLBs occurs, there won't
be a need to enter configuration stage (which is where the STE and CD
are retrieved).  So if we invalidate a cached configuration (in
ConfigCache), we need to invalidate those interface TLB entries as well,
otherwise in theory we will keep the same translation even after a
change in configuration tables.

Change-Id: I4aa36ba8392a530267517bef7562318b282bee25
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Michiel van Tol <michiel.vantol@arm.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/19813
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/dev/arm/smmu_v3_caches.hh b/src/dev/arm/smmu_v3_caches.hh
index 060f60e11..50b293cf2 100644
--- a/src/dev/arm/smmu_v3_caches.hh
+++ b/src/dev/arm/smmu_v3_caches.hh
@@ -130,6 +130,8 @@ class SMMUTLB : public SMMUv3BaseCache
                              bool updStats=true);
     void store(const Entry &incoming, AllocPolicy alloc);
 
+    void invalidateSSID(uint32_t sid, uint32_t ssid);
+    void invalidateSID(uint32_t sid);
     void invalidateVA(Addr va, uint16_t asid, uint16_t vmid);
     void invalidateVAA(Addr va, uint16_t vmid);
     void invalidateASID(uint16_t asid, uint16_t vmid);
@@ -142,6 +144,7 @@ class SMMUTLB : public SMMUv3BaseCache
 
     size_t associativity;
 
+    size_t pickSetIdx(uint32_t sid, uint32_t ssid) const;
     size_t pickSetIdx(Addr va) const;
     size_t pickEntryIdxToReplace(const Set &set, AllocPolicy alloc);
 };