[PULL 17/26] hw/arm/smmu: Support nesting in the rest of commands

[Peter Maydell]

From: Mostafa Saleh <smostafa@google.com>

Some commands need rework for nesting, as they used to assume S1
and S2 are mutually exclusive:

- CMD_TLBI_NH_ASID: Consider VMID if stage-2 is supported
- CMD_TLBI_NH_ALL: Consider VMID if stage-2 is supported, otherwise
  invalidate everything, this required a new vmid invalidation
  function for stage-1 only (ASID >= 0)

Also, rework trace events to reflect the new implementation.

Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Mostafa Saleh <smostafa@google.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 20240715084519.1189624-15-smostafa@google.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 include/hw/arm/smmu-common.h |  1 +
 hw/arm/smmu-common.c         | 16 ++++++++++++++++
 hw/arm/smmuv3.c              | 28 ++++++++++++++++++++++++++--
 hw/arm/trace-events          |  4 +++-
 4 files changed, 46 insertions(+), 3 deletions(-)

diff --git a/include/hw/arm/smmu-common.h b/include/hw/arm/smmu-common.h
index eaee867e45c..d1a4a64551d 100644
--- a/include/hw/arm/smmu-common.h
+++ b/include/hw/arm/smmu-common.h
@@ -215,6 +215,7 @@ SMMUIOTLBKey smmu_get_iotlb_key(int asid, int vmid, 
uint64_t iova,
 void smmu_iotlb_inv_all(SMMUState *s);
 void smmu_iotlb_inv_asid_vmid(SMMUState *s, int asid, int vmid);
 void smmu_iotlb_inv_vmid(SMMUState *s, int vmid);
+void smmu_iotlb_inv_vmid_s1(SMMUState *s, int vmid);
 void smmu_iotlb_inv_iova(SMMUState *s, int asid, int vmid, dma_addr_t iova,
                          uint8_t tg, uint64_t num_pages, uint8_t ttl);
 void smmu_iotlb_inv_ipa(SMMUState *s, int vmid, dma_addr_t ipa, uint8_t tg,
diff --git a/hw/arm/smmu-common.c b/hw/arm/smmu-common.c
index e7f9c758fa6..00d7579cd3d 100644
--- a/hw/arm/smmu-common.c
+++ b/hw/arm/smmu-common.c
@@ -178,6 +178,16 @@ static gboolean smmu_hash_remove_by_vmid(gpointer key, 
gpointer value,
     return SMMU_IOTLB_VMID(*iotlb_key) == vmid;
 }
 
+static gboolean smmu_hash_remove_by_vmid_s1(gpointer key, gpointer value,
+                                            gpointer user_data)
+{
+    int vmid = *(int *)user_data;
+    SMMUIOTLBKey *iotlb_key = (SMMUIOTLBKey *)key;
+
+    return (SMMU_IOTLB_VMID(*iotlb_key) == vmid) &&
+           (SMMU_IOTLB_ASID(*iotlb_key) >= 0);
+}
+
 static gboolean smmu_hash_remove_by_asid_vmid_iova(gpointer key, gpointer 
value,
                                               gpointer user_data)
 {
@@ -288,6 +298,12 @@ void smmu_iotlb_inv_vmid(SMMUState *s, int vmid)
     g_hash_table_foreach_remove(s->iotlb, smmu_hash_remove_by_vmid, &vmid);
 }
 
+inline void smmu_iotlb_inv_vmid_s1(SMMUState *s, int vmid)
+{
+    trace_smmu_iotlb_inv_vmid_s1(vmid);
+    g_hash_table_foreach_remove(s->iotlb, smmu_hash_remove_by_vmid_s1, &vmid);
+}
+
 /* VMSAv8-64 Translation */
 
 /**
diff --git a/hw/arm/smmuv3.c b/hw/arm/smmuv3.c
index 847fc566762..b05f2ab929b 100644
--- a/hw/arm/smmuv3.c
+++ b/hw/arm/smmuv3.c
@@ -1349,25 +1349,49 @@ static int smmuv3_cmdq_consume(SMMUv3State *s)
         case SMMU_CMD_TLBI_NH_ASID:
         {
             int asid = CMD_ASID(&cmd);
+            int vmid = -1;
 
             if (!STAGE1_SUPPORTED(s)) {
                 cmd_error = SMMU_CERROR_ILL;
                 break;
             }
 
+            /*
+             * VMID is only matched when stage 2 is supported, otherwise set it
+             * to -1 as the value used for stage-1 only VMIDs.
+             */
+            if (STAGE2_SUPPORTED(s)) {
+                vmid = CMD_VMID(&cmd);
+            }
+
             trace_smmuv3_cmdq_tlbi_nh_asid(asid);
             smmu_inv_notifiers_all(&s->smmu_state);
-            smmu_iotlb_inv_asid_vmid(bs, asid, -1);
+            smmu_iotlb_inv_asid_vmid(bs, asid, vmid);
             break;
         }
         case SMMU_CMD_TLBI_NH_ALL:
+        {
+            int vmid = -1;
+
             if (!STAGE1_SUPPORTED(s)) {
                 cmd_error = SMMU_CERROR_ILL;
                 break;
             }
+
+            /*
+             * If stage-2 is supported, invalidate for this VMID only, 
otherwise
+             * invalidate the whole thing.
+             */
+            if (STAGE2_SUPPORTED(s)) {
+                vmid = CMD_VMID(&cmd);
+                trace_smmuv3_cmdq_tlbi_nh(vmid);
+                smmu_iotlb_inv_vmid_s1(bs, vmid);
+                break;
+            }
             QEMU_FALLTHROUGH;
+        }
         case SMMU_CMD_TLBI_NSNH_ALL:
-            trace_smmuv3_cmdq_tlbi_nh();
+            trace_smmuv3_cmdq_tlbi_nsnh();
             smmu_inv_notifiers_all(&s->smmu_state);
             smmu_iotlb_inv_all(bs);
             break;
diff --git a/hw/arm/trace-events b/hw/arm/trace-events
index 4aa71b1b196..593cc571da7 100644
--- a/hw/arm/trace-events
+++ b/hw/arm/trace-events
@@ -13,6 +13,7 @@ smmu_get_pte(uint64_t baseaddr, int index, uint64_t pteaddr, 
uint64_t pte) "base
 smmu_iotlb_inv_all(void) "IOTLB invalidate all"
 smmu_iotlb_inv_asid_vmid(int asid, int vmid) "IOTLB invalidate asid=%d vmid=%d"
 smmu_iotlb_inv_vmid(int vmid) "IOTLB invalidate vmid=%d"
+smmu_iotlb_inv_vmid_s1(int vmid) "IOTLB invalidate vmid=%d"
 smmu_iotlb_inv_iova(int asid, uint64_t addr) "IOTLB invalidate asid=%d 
addr=0x%"PRIx64
 smmu_inv_notifiers_mr(const char *name) "iommu mr=%s"
 smmu_iotlb_lookup_hit(int asid, int vmid, uint64_t addr, uint32_t hit, 
uint32_t miss, uint32_t p) "IOTLB cache HIT asid=%d vmid=%d addr=0x%"PRIx64" 
hit=%d miss=%d hit rate=%d"
@@ -47,7 +48,8 @@ smmuv3_cmdq_cfgi_cd(uint32_t sid) "sid=0x%x"
 smmuv3_config_cache_hit(uint32_t sid, uint32_t hits, uint32_t misses, uint32_t 
perc) "Config cache HIT for sid=0x%x (hits=%d, misses=%d, hit rate=%d)"
 smmuv3_config_cache_miss(uint32_t sid, uint32_t hits, uint32_t misses, 
uint32_t perc) "Config cache MISS for sid=0x%x (hits=%d, misses=%d, hit 
rate=%d)"
 smmuv3_range_inval(int vmid, int asid, uint64_t addr, uint8_t tg, uint64_t 
num_pages, uint8_t ttl, bool leaf, int stage) "vmid=%d asid=%d addr=0x%"PRIx64" 
tg=%d num_pages=0x%"PRIx64" ttl=%d leaf=%d stage=%d"
-smmuv3_cmdq_tlbi_nh(void) ""
+smmuv3_cmdq_tlbi_nh(int vmid) "vmid=%d"
+smmuv3_cmdq_tlbi_nsnh(void) ""
 smmuv3_cmdq_tlbi_nh_asid(int asid) "asid=%d"
 smmuv3_cmdq_tlbi_s12_vmid(int vmid) "vmid=%d"
 smmuv3_config_cache_inv(uint32_t sid) "Config cache INV for sid=0x%x"
-- 
2.34.1