[Qemu-devel] [RFC 3/5] Make CPU iotlb a structure rather than a plain hwaddr

[Peter Maydell <peter.maydell@linaro.org>]

Make the CPU iotlb a structure rather than a plain hwaddr;
this will allow us to add transaction attributes to it.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 cputlb.c                |  4 ++--
 include/exec/cpu-defs.h | 13 +++++++++++--
 softmmu_template.h      | 32 +++++++++++++++++---------------
 3 files changed, 30 insertions(+), 19 deletions(-)

diff --git a/cputlb.c b/cputlb.c
index 38f2151..5e1cb8f 100644
--- a/cputlb.c
+++ b/cputlb.c
@@ -301,7 +301,7 @@ void tlb_set_page(CPUState *cpu, target_ulong vaddr,
     env->iotlb_v[mmu_idx][vidx] = env->iotlb[mmu_idx][index];
 
     /* refill the tlb */
-    env->iotlb[mmu_idx][index] = iotlb - vaddr;
+    env->iotlb[mmu_idx][index].addr = iotlb - vaddr;
     te->addend = addend - vaddr;
     if (prot & PAGE_READ) {
         te->addr_read = address;
@@ -349,7 +349,7 @@ tb_page_addr_t get_page_addr_code(CPUArchState *env1, target_ulong addr)
                  (addr & TARGET_PAGE_MASK))) {
         cpu_ldub_code(env1, addr);
     }
-    pd = env1->iotlb[mmu_idx][page_index] & ~TARGET_PAGE_MASK;
+    pd = env1->iotlb[mmu_idx][page_index].addr & ~TARGET_PAGE_MASK;
     mr = iotlb_to_region(cpu, pd);
     if (memory_region_is_unassigned(mr)) {
         CPUClass *cc = CPU_GET_CLASS(cpu);
diff --git a/include/exec/cpu-defs.h b/include/exec/cpu-defs.h
index 0ca6f0b..7f88185 100644
--- a/include/exec/cpu-defs.h
+++ b/include/exec/cpu-defs.h
@@ -102,12 +102,21 @@ typedef struct CPUTLBEntry {
 
 QEMU_BUILD_BUG_ON(sizeof(CPUTLBEntry) != (1 << CPU_TLB_ENTRY_BITS));
 
+/* The IOTLB is not accessed directly inline by generated TCG code,
+ * so the CPUIOTLBEntry layout is not as critical as that of the
+ * CPUTLBEntry. (This is also why we don't want to combine the two
+ * structs into one.)
+ */
+typedef struct CPUIOTLBEntry {
+    hwaddr addr;
+} CPUIOTLBEntry;
+
 #define CPU_COMMON_TLB \
     /* The meaning of the MMU modes is defined in the target code. */   \
     CPUTLBEntry tlb_table[NB_MMU_MODES][CPU_TLB_SIZE];                  \
     CPUTLBEntry tlb_v_table[NB_MMU_MODES][CPU_VTLB_SIZE];               \
-    hwaddr iotlb[NB_MMU_MODES][CPU_TLB_SIZE];                           \
-    hwaddr iotlb_v[NB_MMU_MODES][CPU_VTLB_SIZE];                        \
+    CPUIOTLBEntry iotlb[NB_MMU_MODES][CPU_TLB_SIZE];                    \
+    CPUIOTLBEntry iotlb_v[NB_MMU_MODES][CPU_VTLB_SIZE];                 \
     target_ulong tlb_flush_addr;                                        \
     target_ulong tlb_flush_mask;                                        \
     target_ulong vtlb_index;                                            \
diff --git a/softmmu_template.h b/softmmu_template.h
index 4b9bae7..7a36550 100644
--- a/softmmu_template.h
+++ b/softmmu_template.h
@@ -123,7 +123,7 @@
      * victim tlb. try to refill from the victim tlb before walking the       \
      * page table. */                                                         \
     int vidx;                                                                 \
-    hwaddr tmpiotlb;                                                          \
+    CPUIOTLBEntry tmpiotlb;                                                   \
     CPUTLBEntry tmptlb;                                                       \
     for (vidx = CPU_VTLB_SIZE-1; vidx >= 0; --vidx) {                         \
         if (env->tlb_v_table[mmu_idx][vidx].ty == (addr & TARGET_PAGE_MASK)) {\
@@ -143,12 +143,13 @@
 
 #ifndef SOFTMMU_CODE_ACCESS
 static inline DATA_TYPE glue(io_read, SUFFIX)(CPUArchState *env,
-                                              hwaddr physaddr,
+                                              CPUIOTLBEntry *iotlbentry,
                                               target_ulong addr,
                                               uintptr_t retaddr)
 {
     uint64_t val;
     CPUState *cpu = ENV_GET_CPU(env);
+    hwaddr physaddr = iotlbentry->addr;
     MemoryRegion *mr = iotlb_to_region(cpu, physaddr);
 
     physaddr = (physaddr & TARGET_PAGE_MASK) + addr;
@@ -195,15 +196,15 @@ WORD_TYPE helper_le_ld_name(CPUArchState *env, target_ulong addr, int mmu_idx,
 
     /* Handle an IO access.  */
     if (unlikely(tlb_addr & ~TARGET_PAGE_MASK)) {
-        hwaddr ioaddr;
+        CPUIOTLBEntry *iotlbentry;
         if ((addr & (DATA_SIZE - 1)) != 0) {
             goto do_unaligned_access;
         }
-        ioaddr = env->iotlb[mmu_idx][index];
+        iotlbentry = &env->iotlb[mmu_idx][index];
 
         /* ??? Note that the io helpers always read data in the target
            byte ordering.  We should push the LE/BE request down into io.  */
-        res = glue(io_read, SUFFIX)(env, ioaddr, addr, retaddr);
+        res = glue(io_read, SUFFIX)(env, iotlbentry, addr, retaddr);
         res = TGT_LE(res);
         return res;
     }
@@ -283,15 +284,15 @@ WORD_TYPE helper_be_ld_name(CPUArchState *env, target_ulong addr, int mmu_idx,
 
     /* Handle an IO access.  */
     if (unlikely(tlb_addr & ~TARGET_PAGE_MASK)) {
-        hwaddr ioaddr;
+        CPUIOTLBEntry *iotlbentry;
         if ((addr & (DATA_SIZE - 1)) != 0) {
             goto do_unaligned_access;
         }
-        ioaddr = env->iotlb[mmu_idx][index];
+        iotlbentry = &env->iotlb[mmu_idx][index];
 
         /* ??? Note that the io helpers always read data in the target
            byte ordering.  We should push the LE/BE request down into io.  */
-        res = glue(io_read, SUFFIX)(env, ioaddr, addr, retaddr);
+        res = glue(io_read, SUFFIX)(env, iotlbentry, addr, retaddr);
         res = TGT_BE(res);
         return res;
     }
@@ -363,12 +364,13 @@ WORD_TYPE helper_be_lds_name(CPUArchState *env, target_ulong addr,
 #endif
 
 static inline void glue(io_write, SUFFIX)(CPUArchState *env,
-                                          hwaddr physaddr,
+                                          CPUIOTLBEntry *iotlbentry,
                                           DATA_TYPE val,
                                           target_ulong addr,
                                           uintptr_t retaddr)
 {
     CPUState *cpu = ENV_GET_CPU(env);
+    hwaddr physaddr = iotlbentry->addr;
     MemoryRegion *mr = iotlb_to_region(cpu, physaddr);
 
     physaddr = (physaddr & TARGET_PAGE_MASK) + addr;
@@ -408,16 +410,16 @@ void helper_le_st_name(CPUArchState *env, target_ulong addr, DATA_TYPE val,
 
     /* Handle an IO access.  */
     if (unlikely(tlb_addr & ~TARGET_PAGE_MASK)) {
-        hwaddr ioaddr;
+        CPUIOTLBEntry *iotlbentry;
         if ((addr & (DATA_SIZE - 1)) != 0) {
             goto do_unaligned_access;
         }
-        ioaddr = env->iotlb[mmu_idx][index];
+        iotlbentry = &env->iotlb[mmu_idx][index];
 
         /* ??? Note that the io helpers always read data in the target
            byte ordering.  We should push the LE/BE request down into io.  */
         val = TGT_LE(val);
-        glue(io_write, SUFFIX)(env, ioaddr, val, addr, retaddr);
+        glue(io_write, SUFFIX)(env, iotlbentry, val, addr, retaddr);
         return;
     }
 
@@ -489,16 +491,16 @@ void helper_be_st_name(CPUArchState *env, target_ulong addr, DATA_TYPE val,
 
     /* Handle an IO access.  */
     if (unlikely(tlb_addr & ~TARGET_PAGE_MASK)) {
-        hwaddr ioaddr;
+        CPUIOTLBEntry *iotlbentry;
         if ((addr & (DATA_SIZE - 1)) != 0) {
             goto do_unaligned_access;
         }
-        ioaddr = env->iotlb[mmu_idx][index];
+        iotlbentry = &env->iotlb[mmu_idx][index];
 
         /* ??? Note that the io helpers always read data in the target
            byte ordering.  We should push the LE/BE request down into io.  */
         val = TGT_BE(val);
-        glue(io_write, SUFFIX)(env, ioaddr, val, addr, retaddr);
+        glue(io_write, SUFFIX)(env, iotlbentry, val, addr, retaddr);
         return;
     }
 
-- 
1.9.1