Compute the starting level on CD decoding and store it
into SMMUTransTableInfo. We will need this information
on IOTLB lookup so let's avoid to recompute it each time.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
 include/hw/arm/smmu-common.h | 1 +
 hw/arm/smmu-common.c         | 2 +-
 hw/arm/smmuv3.c              | 8 ++++++--
 hw/arm/trace-events          | 2 +-
 4 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/include/hw/arm/smmu-common.h b/include/hw/arm/smmu-common.h
index f6ee78e16c..676e53c086 100644
--- a/include/hw/arm/smmu-common.h
+++ b/include/hw/arm/smmu-common.h
@@ -50,6 +50,7 @@ typedef struct SMMUTransTableInfo {
     uint64_t ttb;              /* TT base address */
     uint8_t tsz;               /* input range, ie. 2^(64 -tsz)*/
     uint8_t granule_sz;        /* granule page shift */
+    uint8_t starting_level;    /* starting level */
 } SMMUTransTableInfo;
 
 struct SMMUTLBEntry {
diff --git a/hw/arm/smmu-common.c b/hw/arm/smmu-common.c
index aa88b62efb..c2ed8346fb 100644
--- a/hw/arm/smmu-common.c
+++ b/hw/arm/smmu-common.c
@@ -224,7 +224,7 @@ static int smmu_ptw_64(SMMUTransCfg *cfg,
     granule_sz = tt->granule_sz;
     stride = granule_sz - 3;
     inputsize = 64 - tt->tsz;
-    level = 4 - (inputsize - 4) / stride;
+    level = tt->starting_level;
     indexmask = (1ULL << (inputsize - (stride * (4 - level)))) - 1;
     baseaddr = extract64(tt->ttb, 0, 48);
     baseaddr &= ~indexmask;
diff --git a/hw/arm/smmuv3.c b/hw/arm/smmuv3.c
index db74d27add..12d3e972d6 100644
--- a/hw/arm/smmuv3.c
+++ b/hw/arm/smmuv3.c
@@ -482,7 +482,7 @@ static int decode_cd(SMMUTransCfg *cfg, CD *cd, SMMUEventInfo *event)
 
     /* decode data dependent on TT */
     for (i = 0; i <= 1; i++) {
-        int tg, tsz;
+        int tg, tsz, input_size, stride;
         SMMUTransTableInfo *tt = &cfg->tt[i];
 
         cfg->tt[i].disabled = CD_EPD(cd, i);
@@ -502,11 +502,15 @@ static int decode_cd(SMMUTransCfg *cfg, CD *cd, SMMUEventInfo *event)
         }
 
         tt->tsz = tsz;
+        input_size = 64 - tt->tsz;
+        stride = tt->granule_sz - 3;
         tt->ttb = CD_TTB(cd, i);
         if (tt->ttb & ~(MAKE_64BIT_MASK(0, cfg->oas))) {
             goto bad_cd;
         }
-        trace_smmuv3_decode_cd_tt(i, tt->tsz, tt->ttb, tt->granule_sz);
+        tt->starting_level = 4 - (input_size - 4) / stride;
+        trace_smmuv3_decode_cd_tt(i, tt->tsz, tt->ttb,
+                                  tt->granule_sz, tt->starting_level);
     }
 
     event->record_trans_faults = CD_R(cd);
diff --git a/hw/arm/trace-events b/hw/arm/trace-events
index b808a1bfc1..7263b9c586 100644
--- a/hw/arm/trace-events
+++ b/hw/arm/trace-events
@@ -39,7 +39,7 @@ smmuv3_translate_abort(const char *n, uint16_t sid, uint64_t addr, bool is_write
 smmuv3_translate_success(const char *n, uint16_t sid, uint64_t iova, uint64_t translated, int perm) "%s sid=%d iova=0x%"PRIx64" translated=0x%"PRIx64" perm=0x%x"
 smmuv3_get_cd(uint64_t addr) "CD addr: 0x%"PRIx64
 smmuv3_decode_cd(uint32_t oas) "oas=%d"
-smmuv3_decode_cd_tt(int i, uint32_t tsz, uint64_t ttb, uint32_t granule_sz) "TT[%d]:tsz:%d ttb:0x%"PRIx64" granule_sz:%d"
+smmuv3_decode_cd_tt(int i, uint32_t tsz, uint64_t ttb, uint32_t granule_sz, uint8_t starting_level) "TT[%d]:tsz:%d ttb:0x%"PRIx64" granule_sz:%d starting_level=%d"
 smmuv3_cmdq_cfgi_ste(int streamid) "streamid =%d"
 smmuv3_cmdq_cfgi_ste_range(int start, int end) "start=0x%d - end=0x%d"
 smmuv3_cmdq_cfgi_cd(uint32_t sid) "streamid = %d"
-- 
2.20.1