[Qemu-devel] [PATCH 09/14] e1000: use the DMA memory access interface

[David Gibson <david@gibson.dropbear.id.au>]

This allows the device to work properly with an emulated IOMMU.

Signed-off-by: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
---
 hw/e1000.c |   27 +++++++++++++++------------
 1 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/hw/e1000.c b/hw/e1000.c
index f160bfc..b10c6d6 100644
--- a/hw/e1000.c
+++ b/hw/e1000.c
@@ -472,7 +472,7 @@ process_tx_desc(E1000State *s, struct e1000_tx_desc *dp)
             bytes = split_size;
             if (tp->size + bytes > msh)
                 bytes = msh - tp->size;
-            cpu_physical_memory_read(addr, tp->data + tp->size, bytes);
+            dma_memory_read(&s->dev.qdev, addr, tp->data + tp->size, bytes);
             if ((sz = tp->size + bytes) >= hdr && tp->size < hdr)
                 memmove(tp->header, tp->data, hdr);
             tp->size = sz;
@@ -487,7 +487,7 @@ process_tx_desc(E1000State *s, struct e1000_tx_desc *dp)
         // context descriptor TSE is not set, while data descriptor TSE is set
         DBGOUT(TXERR, "TCP segmentaion Error\n");
     } else {
-        cpu_physical_memory_read(addr, tp->data + tp->size, split_size);
+        dma_memory_read(&s->dev.qdev, addr, tp->data + tp->size, split_size);
         tp->size += split_size;
     }
 
@@ -503,7 +503,9 @@ process_tx_desc(E1000State *s, struct e1000_tx_desc *dp)
 }
 
 static uint32_t
-txdesc_writeback(target_phys_addr_t base, struct e1000_tx_desc *dp)
+txdesc_writeback(E1000State *s,
+                 target_phys_addr_t base,
+                 struct e1000_tx_desc *dp)
 {
     uint32_t txd_upper, txd_lower = le32_to_cpu(dp->lower.data);
 
@@ -512,8 +514,9 @@ txdesc_writeback(target_phys_addr_t base, struct e1000_tx_desc *dp)
     txd_upper = (le32_to_cpu(dp->upper.data) | E1000_TXD_STAT_DD) &
                 ~(E1000_TXD_STAT_EC | E1000_TXD_STAT_LC | E1000_TXD_STAT_TU);
     dp->upper.data = cpu_to_le32(txd_upper);
-    cpu_physical_memory_write(base + ((char *)&dp->upper - (char *)dp),
-                              (void *)&dp->upper, sizeof(dp->upper));
+    dma_memory_write(&s->dev.qdev,
+                     base + ((char *)&dp->upper - (char *)dp),
+                     (void *)&dp->upper, sizeof(dp->upper));
     return E1000_ICR_TXDW;
 }
 
@@ -540,14 +543,14 @@ start_xmit(E1000State *s)
     while (s->mac_reg[TDH] != s->mac_reg[TDT]) {
         base = tx_desc_base(s) +
                sizeof(struct e1000_tx_desc) * s->mac_reg[TDH];
-        cpu_physical_memory_read(base, (void *)&desc, sizeof(desc));
+        dma_memory_read(&s->dev.qdev, base, (void *)&desc, sizeof(desc));
 
         DBGOUT(TX, "index %d: %p : %x %x\n", s->mac_reg[TDH],
                (void *)(intptr_t)desc.buffer_addr, desc.lower.data,
                desc.upper.data);
 
         process_tx_desc(s, &desc);
-        cause |= txdesc_writeback(base, &desc);
+        cause |= txdesc_writeback(s, base, &desc);
 
         if (++s->mac_reg[TDH] * sizeof(desc) >= s->mac_reg[TDLEN])
             s->mac_reg[TDH] = 0;
@@ -717,7 +720,7 @@ e1000_receive(VLANClientState *nc, const uint8_t *buf, size_t size)
             desc_size = s->rxbuf_size;
         }
         base = rx_desc_base(s) + sizeof(desc) * s->mac_reg[RDH];
-        cpu_physical_memory_read(base, (void *)&desc, sizeof(desc));
+        dma_memory_read(&s->dev.qdev, base, (void *)&desc, sizeof(desc));
         desc.special = vlan_special;
         desc.status |= (vlan_status | E1000_RXD_STAT_DD);
         if (desc.buffer_addr) {
@@ -726,9 +729,9 @@ e1000_receive(VLANClientState *nc, const uint8_t *buf, size_t size)
                 if (copy_size > s->rxbuf_size) {
                     copy_size = s->rxbuf_size;
                 }
-                cpu_physical_memory_write(le64_to_cpu(desc.buffer_addr),
-                                          (void *)(buf + desc_offset + vlan_offset),
-                                          copy_size);
+                dma_memory_write(&s->dev.qdev, le64_to_cpu(desc.buffer_addr),
+                                 (void *)(buf + desc_offset + vlan_offset),
+                                 copy_size);
             }
             desc_offset += desc_size;
             desc.length = cpu_to_le16(desc_size);
@@ -742,7 +745,7 @@ e1000_receive(VLANClientState *nc, const uint8_t *buf, size_t size)
         } else { // as per intel docs; skip descriptors with null buf addr
             DBGOUT(RX, "Null RX descriptor!!\n");
         }
-        cpu_physical_memory_write(base, (void *)&desc, sizeof(desc));
+        dma_memory_write(&s->dev.qdev, base, (void *)&desc, sizeof(desc));
 
         if (++s->mac_reg[RDH] * sizeof(desc) >= s->mac_reg[RDLEN])
             s->mac_reg[RDH] = 0;
-- 
1.7.4.4