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hw/arm/smmuv3: IOTLB emulation

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We emulate a TLB cache of size SMMU_IOTLB_MAX_SIZE=256.
It is implemented as a hash table whose key is a combination
of the 16b asid and 48b IOVA (Jenkins hash).

Entries are invalidated on TLB invalidation commands, either
globally, or per asid, or per asid/iova.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Message-id: 1529653501-15358-4-git-send-email-eric.auger@redhat.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Eric Auger 2018-06-26 17:50:42 +01:00 • committed by Peter Maydell
parent 32cfd7f39e
commit cc27ed81cf
4 changed files with 176 additions and 4 deletions
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13
include/hw/arm/smmu-common.h
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@ -67,6 +67,8 @@ typedef struct SMMUTransCfg {
uint8_t tbi; /* Top Byte Ignore */
uint16_t asid;
SMMUTransTableInfo tt[2];
uint32_t iotlb_hits; /* counts IOTLB hits for this asid */
uint32_t iotlb_misses; /* counts IOTLB misses for this asid */
} SMMUTransCfg;
typedef struct SMMUDevice {
@ -89,6 +91,11 @@ typedef struct SMMUPciBus {
SMMUDevice *pbdev[0]; /* Parent array is sparse, so dynamically alloc */
} SMMUPciBus;
typedef struct SMMUIOTLBKey {
uint64_t iova;
uint16_t asid;
} SMMUIOTLBKey;
typedef struct SMMUState {
/* <private> */
SysBusDevice dev;
@ -147,4 +154,10 @@ SMMUTransTableInfo *select_tt(SMMUTransCfg *cfg, dma_addr_t iova);
/* Return the iommu mr associated to @sid, or NULL if none */
IOMMUMemoryRegion *smmu_iommu_mr(SMMUState *s, uint32_t sid);
#define SMMU_IOTLB_MAX_SIZE 256
void smmu_iotlb_inv_all(SMMUState *s);
void smmu_iotlb_inv_asid(SMMUState *s, uint16_t asid);
void smmu_iotlb_inv_iova(SMMUState *s, uint16_t asid, dma_addr_t iova);
#endif /* HW_ARM_SMMU_COMMON */