spapr_iommu: Introduce bus_offset in sPAPRTCETable

This adds @bus_offset into sPAPRTCETable to tell where TCE table starts
from. It is set to 0 for emulated devices. Dynamic DMA windows will use
other offset.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Alexander Graf <agraf@suse.de>

hw/ppc/spapr_iommu.c

@@ -140,6 +140,7 @@ static int spapr_tce_table_realize(DeviceState *dev)
 }
 
 sPAPRTCETable *spapr_tce_new_table(DeviceState *owner, uint32_t liobn,
+                                   uint64_t bus_offset,
                                    uint32_t page_shift,
                                    uint32_t nb_table)
 {
@@ -157,6 +158,7 @@ sPAPRTCETable *spapr_tce_new_table(DeviceState *owner, uint32_t liobn,
 
     tcet = SPAPR_TCE_TABLE(object_new(TYPE_SPAPR_TCE_TABLE));
     tcet->liobn = liobn;
+    tcet->bus_offset = bus_offset;
     tcet->page_shift = page_shift;
     tcet->nb_table = nb_table;
 
@@ -204,14 +206,15 @@ static target_ulong put_tce_emu(sPAPRTCETable *tcet, target_ulong ioba,
 {
     IOMMUTLBEntry entry;
     hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
+    unsigned long index = (ioba - tcet->bus_offset) >> tcet->page_shift;
 
-    if ((ioba >> tcet->page_shift) >= tcet->nb_table) {
+    if (index >= tcet->nb_table) {
         hcall_dprintf("spapr_vio_put_tce on out-of-bounds IOBA 0x"
                       TARGET_FMT_lx "\n", ioba);
         return H_PARAMETER;
     }
 
-    tcet->table[ioba >> tcet->page_shift] = tce;
+    tcet->table[index] = tce;
 
     entry.target_as = &address_space_memory,
     entry.iova = ioba & page_mask;
@@ -330,13 +333,15 @@ static target_ulong h_put_tce(PowerPCCPU *cpu, sPAPREnvironment *spapr,
 static target_ulong get_tce_emu(sPAPRTCETable *tcet, target_ulong ioba,
                                 target_ulong *tce)
 {
-    if ((ioba >> tcet->page_shift) >= tcet->nb_table) {
+    unsigned long index = (ioba - tcet->bus_offset) >> tcet->page_shift;
+
+    if (index >= tcet->nb_table) {
         hcall_dprintf("spapr_iommu_get_tce on out-of-bounds IOBA 0x"
                       TARGET_FMT_lx "\n", ioba);
         return H_PARAMETER;
     }
 
-    *tce = tcet->table[ioba >> tcet->page_shift];
+    *tce = tcet->table[index];
 
     return H_SUCCESS;
 }

hw/ppc/spapr_pci.c

@@ -656,6 +656,7 @@ static void spapr_phb_finish_realize(sPAPRPHBState *sphb, Error **errp)
     sPAPRTCETable *tcet;
 
     tcet = spapr_tce_new_table(DEVICE(sphb), sphb->dma_liobn,
+                               0,
                                SPAPR_TCE_PAGE_SHIFT,
                                0x40000000 >> SPAPR_TCE_PAGE_SHIFT);
     if (!tcet) {
@@ -813,8 +814,8 @@ static int spapr_phb_children_dt(Object *child, void *opaque)
     }
 
     spapr_dma_dt(p->fdt, p->node_off, "ibm,dma-window",
-                 tcet->liobn, 0,
-                 tcet->nb_table << SPAPR_TCE_PAGE_SHIFT);
+                 tcet->liobn, tcet->bus_offset,
+                 tcet->nb_table << tcet->page_shift);
     /* Stop after the first window */
 
     return 1;

hw/ppc/spapr_vio.c

@@ -457,6 +457,7 @@ static int spapr_vio_busdev_init(DeviceState *qdev)
     if (pc->rtce_window_size) {
         uint32_t liobn = SPAPR_VIO_BASE_LIOBN | dev->reg;
         dev->tcet = spapr_tce_new_table(qdev, liobn,
+                                        0,
                                         SPAPR_TCE_PAGE_SHIFT,
                                         pc->rtce_window_size >>
                                         SPAPR_TCE_PAGE_SHIFT);

include/hw/ppc/spapr.h

@@ -398,6 +398,7 @@ struct sPAPRTCETable {
     DeviceState parent;
     uint32_t liobn;
     uint32_t nb_table;
+    uint64_t bus_offset;
     uint32_t page_shift;
     uint64_t *table;
     bool bypass;
@@ -410,6 +411,7 @@ void spapr_events_init(sPAPREnvironment *spapr);
 void spapr_events_fdt_skel(void *fdt, uint32_t epow_irq);
 int spapr_h_cas_compose_response(target_ulong addr, target_ulong size);
 sPAPRTCETable *spapr_tce_new_table(DeviceState *owner, uint32_t liobn,
+                                   uint64_t bus_offset,
                                    uint32_t page_shift,
                                    uint32_t nb_table);
 MemoryRegion *spapr_tce_get_iommu(sPAPRTCETable *tcet);