hw/dma/pl080: Don't use CPU address space for DMA accesses

Currently our PL080/PL081 model uses a combination of the CPU's
address space (via cpu_physical_memory_{read,write}()) and the
system address space for performing DMA accesses.

For the PL081s in the MPS FPGA images, their DMA accesses
must go via Master Security Controllers. Switch the
PL080/PL081 model to take a MemoryRegion property which
defines its downstream for making DMA accesses.

Since the PL08x are only used in two board models, we
make provision of the 'downstream' link mandatory and convert
both users at once, rather than having it be optional with
a default to the system address space.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

4 files changed, 49 insertions, 8 deletions

diff --git a/hw/arm/realview.c b/hw/arm/realview.c
index cd585d9469..ab8c14fde3 100644
--- a/hw/arm/realview.c
+++ b/hw/arm/realview.c
@@ -201,7 +201,13 @@ static void realview_init(MachineState *machine,
     pl011_create(0x1000c000, pic[15], serial_hd(3));
 
     /* DMA controller is optional, apparently.  */
-    sysbus_create_simple("pl081", 0x10030000, pic[24]);
+    dev = qdev_create(NULL, "pl081");
+    object_property_set_link(OBJECT(dev), OBJECT(sysmem), "downstream",
+                             &error_fatal);
+    qdev_init_nofail(dev);
+    busdev = SYS_BUS_DEVICE(dev);
+    sysbus_mmio_map(busdev, 0, 0x10030000);
+    sysbus_connect_irq(busdev, 0, pic[24]);
 
     sysbus_create_simple("sp804", 0x10011000, pic[4]);
     sysbus_create_simple("sp804", 0x10012000, pic[5]);
diff --git a/hw/arm/versatilepb.c b/hw/arm/versatilepb.c
index a5a06b6d40..8b74857059 100644
--- a/hw/arm/versatilepb.c
+++ b/hw/arm/versatilepb.c
@@ -287,7 +287,14 @@ static void versatile_init(MachineState *machine, int board_id)
     pl011_create(0x101f3000, pic[14], serial_hd(2));
     pl011_create(0x10009000, sic[6], serial_hd(3));
 
-    sysbus_create_simple("pl080", 0x10130000, pic[17]);
+    dev = qdev_create(NULL, "pl080");
+    object_property_set_link(OBJECT(dev), OBJECT(sysmem), "downstream",
+                             &error_fatal);
+    qdev_init_nofail(dev);
+    busdev = SYS_BUS_DEVICE(dev);
+    sysbus_mmio_map(busdev, 0, 0x10130000);
+    sysbus_connect_irq(busdev, 0, pic[17]);
+
     sysbus_create_simple("sp804", 0x101e2000, pic[4]);
     sysbus_create_simple("sp804", 0x101e3000, pic[5]);
 
diff --git a/hw/dma/pl080.c b/hw/dma/pl080.c
index 301030dd11..8f9f3e08d9 100644
--- a/hw/dma/pl080.c
+++ b/hw/dma/pl080.c
@@ -12,6 +12,7 @@
 #include "exec/address-spaces.h"
 #include "qemu/log.h"
 #include "hw/dma/pl080.h"
+#include "qapi/error.h"
 
 #define PL080_CONF_E    0x1
 #define PL080_CONF_M1   0x2
@@ -161,14 +162,16 @@ again:
             swidth = 1 << ((ch->ctrl >> 18) & 7);
             dwidth = 1 << ((ch->ctrl >> 21) & 7);
             for (n = 0; n < dwidth; n+= swidth) {
-                cpu_physical_memory_read(ch->src, buff + n, swidth);
+                address_space_read(&s->downstream_as, ch->src,
+                                   MEMTXATTRS_UNSPECIFIED, buff + n, swidth);
                 if (ch->ctrl & PL080_CCTRL_SI)
                     ch->src += swidth;
             }
             xsize = (dwidth < swidth) ? swidth : dwidth;
             /* ??? This may pad the value incorrectly for dwidth < 32.  */
             for (n = 0; n < xsize; n += dwidth) {
-                cpu_physical_memory_write(ch->dest + n, buff + n, dwidth);
+                address_space_write(&s->downstream_as, ch->dest + n,
+                                    MEMTXATTRS_UNSPECIFIED, buff + n, dwidth);
                 if (ch->ctrl & PL080_CCTRL_DI)
                     ch->dest += swidth;
             }
@@ -178,19 +181,19 @@ again:
             if (size == 0) {
                 /* Transfer complete.  */
                 if (ch->lli) {
-                    ch->src = address_space_ldl_le(&address_space_memory,
+                    ch->src = address_space_ldl_le(&s->downstream_as,
                                                    ch->lli,
                                                    MEMTXATTRS_UNSPECIFIED,
                                                    NULL);
-                    ch->dest = address_space_ldl_le(&address_space_memory,
+                    ch->dest = address_space_ldl_le(&s->downstream_as,
                                                     ch->lli + 4,
                                                     MEMTXATTRS_UNSPECIFIED,
                                                     NULL);
-                    ch->ctrl = address_space_ldl_le(&address_space_memory,
+                    ch->ctrl = address_space_ldl_le(&s->downstream_as,
                                                     ch->lli + 12,
                                                     MEMTXATTRS_UNSPECIFIED,
                                                     NULL);
-                    ch->lli = address_space_ldl_le(&address_space_memory,
+                    ch->lli = address_space_ldl_le(&s->downstream_as,
                                                    ch->lli + 8,
                                                    MEMTXATTRS_UNSPECIFIED,
                                                    NULL);
@@ -358,6 +361,18 @@ static void pl080_init(Object *obj)
     s->nchannels = 8;
 }
 
+static void pl080_realize(DeviceState *dev, Error **errp)
+{
+    PL080State *s = PL080(dev);
+
+    if (!s->downstream) {
+        error_setg(errp, "PL080 'downstream' link not set");
+        return;
+    }
+
+    address_space_init(&s->downstream_as, s->downstream, "pl080-downstream");
+}
+
 static void pl081_init(Object *obj)
 {
     PL080State *s = PL080(obj);
@@ -365,11 +380,19 @@ static void pl081_init(Object *obj)
     s->nchannels = 2;
 }
 
+static Property pl080_properties[] = {
+    DEFINE_PROP_LINK("downstream", PL080State, downstream,
+                     TYPE_MEMORY_REGION, MemoryRegion *),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
 static void pl080_class_init(ObjectClass *oc, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(oc);
 
     dc->vmsd = &vmstate_pl080;
+    dc->realize = pl080_realize;
+    dc->props = pl080_properties;
 }
 
 static const TypeInfo pl080_info = {
diff --git a/include/hw/dma/pl080.h b/include/hw/dma/pl080.h
index 7c6a418483..9d4b3df143 100644
--- a/include/hw/dma/pl080.h
+++ b/include/hw/dma/pl080.h
@@ -21,6 +21,8 @@
  * + sysbus IRQ 1: DMACINTERR error interrupt request
  * + sysbus IRQ 2: DMACINTTC count interrupt request
  * + sysbus MMIO region 0: MemoryRegion for the device's registers
+ * + QOM property "downstream": MemoryRegion defining where DMA
+ *   bus master transactions are made
  */
 
 #ifndef HW_DMA_PL080_H
@@ -61,6 +63,9 @@ typedef struct PL080State {
     qemu_irq irq;
     qemu_irq interr;
     qemu_irq inttc;
+
+    MemoryRegion *downstream;
+    AddressSpace downstream_as;
 } PL080State;
 
 #endif