[Qemu-devel] [PATCH] pseries iommu: h_put_tce split to support more IOMMUs

[Alexey Kardashevskiy <aik@ozlabs.ru>]

sPAPR IOMMU RTAS handler is split to common h_put_tce() part and
emulated IOMMU implementation called put_tce_emu().

Further patches will extend h_put_tce() with put_tce_vfio() in
order to support other types of IOMMU such as VFIO.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---
 hw/spapr_iommu.c |   25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/hw/spapr_iommu.c b/hw/spapr_iommu.c
index 388ffa4..3021bfe 100644
--- a/hw/spapr_iommu.c
+++ b/hw/spapr_iommu.c
@@ -162,21 +162,25 @@ void spapr_tce_free(DMAContext *dma)
     }
 }
 
-static target_ulong put_tce_emu(sPAPRTCETable *tcet, target_ulong ioba,
-                                target_ulong tce)
+static int put_tce_emu(target_ulong liobn, target_ulong ioba, target_ulong tce)
 {
+    sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
     sPAPRTCE *tcep;
 
+    if (!tcet) {
+        return 1;
+    }
+
     if (ioba >= tcet->window_size) {
         hcall_dprintf("spapr_vio_put_tce on out-of-boards IOBA 0x"
                       TARGET_FMT_lx "\n", ioba);
-        return H_PARAMETER;
+        return -1;
     }
 
     tcep = tcet->table + (ioba >> SPAPR_TCE_PAGE_SHIFT);
     tcep->tce = tce;
 
-    return H_SUCCESS;
+    return 0;
 }
 
 static target_ulong h_put_tce(CPUPPCState *env, sPAPREnvironment *spapr,
@@ -185,7 +189,7 @@ static target_ulong h_put_tce(CPUPPCState *env, sPAPREnvironment *spapr,
     target_ulong liobn = args[0];
     target_ulong ioba = args[1];
     target_ulong tce = args[2];
-    sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
+    int ret;
 
     if (liobn & 0xFFFFFFFF00000000ULL) {
         hcall_dprintf("spapr_vio_put_tce on out-of-boundsw LIOBN "
@@ -195,13 +199,14 @@ static target_ulong h_put_tce(CPUPPCState *env, sPAPREnvironment *spapr,
 
     ioba &= ~(SPAPR_TCE_PAGE_SIZE - 1);
 
-    if (tcet) {
-        return put_tce_emu(tcet, ioba, tce);
+    ret = put_tce_emu(liobn, ioba, tce);
+    if (0 >= ret) {
+        return ret ? H_PARAMETER : H_SUCCESS;
     }
 #ifdef DEBUG_TCE
-    fprintf(stderr, "%s on liobn=" TARGET_FMT_lx /*%s*/
-            "  ioba 0x" TARGET_FMT_lx "  TCE 0x" TARGET_FMT_lx "\n",
-            __func__, liobn, /*dev->qdev.id, */ioba, tce);
+    fprintf(stderr, "%s on liobn=" TARGET_FMT_lx
+            "  ioba 0x" TARGET_FMT_lx "  TCE 0x" TARGET_FMT_lx " ret=%d\n",
+            __func__, liobn, ioba, tce, ret);
 #endif
 
     return H_PARAMETER;
-- 
1.7.10