xlnx-zynqmp: Add support for high DDR memory regions

The Xilinx ZynqMP SoC and EP108 board supports three memory regions:
 - A 2GB region starting at 0
 - A 32GB region starting at 32GB
 - A 256GB region starting at 768GB

This patch adds support for the first two memory regions, which is
automatically created based on the size specified by the QEMU memory
command line argument.

On hardware the physical memory region is one continuous region, it is then
mapped into the three different regions by the DDRC. As we don't model the
DDRC this is done at startup by QEMU. The board creates the memory region and
then passes that memory region to the SoC. The SoC then maps the memory
regions.

Signed-off-by: Alistair Francis <alistair.francis@xilinx.com>
Reviewed-by: Peter Crosthwaite <crosthwaite.peter@gmail.com>
Message-id: a1e47db941d65733724a300fcd98b74fbeeaaf22.1452637205.git.alistair.francis@xilinx.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/arm/xlnx-ep108.c

@@ -25,42 +25,44 @@ typedef struct XlnxEP108 {
     MemoryRegion ddr_ram;
 } XlnxEP108;
 
-/* Max 2GB RAM */
-#define EP108_MAX_RAM_SIZE 0x80000000ull
-
 static struct arm_boot_info xlnx_ep108_binfo;
 
 static void xlnx_ep108_init(MachineState *machine)
 {
     XlnxEP108 *s = g_new0(XlnxEP108, 1);
     Error *err = NULL;
+    uint64_t ram_size = machine->ram_size;
+
+    /* Create the memory region to pass to the SoC */
+    if (ram_size > XLNX_ZYNQMP_MAX_RAM_SIZE) {
+        error_report("ERROR: RAM size 0x%" PRIx64 " above max supported of "
+                     "0x%llx", ram_size,
+                     XLNX_ZYNQMP_MAX_RAM_SIZE);
+        exit(1);
+    }
+
+    if (ram_size < 0x08000000) {
+        qemu_log("WARNING: RAM size 0x%" PRIx64 " is small for EP108",
+                 ram_size);
+    }
+
+    memory_region_allocate_system_memory(&s->ddr_ram, NULL, "ddr-ram",
+                                         ram_size);
 
     object_initialize(&s->soc, sizeof(s->soc), TYPE_XLNX_ZYNQMP);
     object_property_add_child(OBJECT(machine), "soc", OBJECT(&s->soc),
                               &error_abort);
 
+    object_property_set_link(OBJECT(&s->soc), OBJECT(&s->ddr_ram),
+                         "ddr-ram", &error_abort);
+
     object_property_set_bool(OBJECT(&s->soc), true, "realized", &err);
     if (err) {
         error_report_err(err);
         exit(1);
     }
 
-    if (machine->ram_size > EP108_MAX_RAM_SIZE) {
+    xlnx_ep108_binfo.ram_size = ram_size;
-        error_report("WARNING: RAM size " RAM_ADDR_FMT " above max supported, "
-                     "reduced to %llx", machine->ram_size, EP108_MAX_RAM_SIZE);
-        machine->ram_size = EP108_MAX_RAM_SIZE;
-    }
-
-    if (machine->ram_size < 0x08000000) {
-        qemu_log("WARNING: RAM size " RAM_ADDR_FMT " is small for EP108",
-                 machine->ram_size);
-    }
-
-    memory_region_allocate_system_memory(&s->ddr_ram, NULL, "ddr-ram",
-                                         machine->ram_size);
-    memory_region_add_subregion(get_system_memory(), 0, &s->ddr_ram);
-
-    xlnx_ep108_binfo.ram_size = machine->ram_size;
     xlnx_ep108_binfo.kernel_filename = machine->kernel_filename;
     xlnx_ep108_binfo.kernel_cmdline = machine->kernel_cmdline;
     xlnx_ep108_binfo.initrd_filename = machine->initrd_filename;

hw/arm/xlnx-zynqmp.c

@@ -90,6 +90,11 @@ static void xlnx_zynqmp_init(Object *obj)
                                   &error_abort);
     }
 
+    object_property_add_link(obj, "ddr-ram", TYPE_MEMORY_REGION,
+                             (Object **)&s->ddr_ram,
+                             qdev_prop_allow_set_link_before_realize,
+                             OBJ_PROP_LINK_UNREF_ON_RELEASE, &error_abort);
+
     object_initialize(&s->gic, sizeof(s->gic), TYPE_ARM_GIC);
     qdev_set_parent_bus(DEVICE(&s->gic), sysbus_get_default());
 
@@ -119,10 +124,42 @@ static void xlnx_zynqmp_realize(DeviceState *dev, Error **errp)
     XlnxZynqMPState *s = XLNX_ZYNQMP(dev);
     MemoryRegion *system_memory = get_system_memory();
     uint8_t i;
+    uint64_t ram_size;
     const char *boot_cpu = s->boot_cpu ? s->boot_cpu : "apu-cpu[0]";
+    ram_addr_t ddr_low_size, ddr_high_size;
     qemu_irq gic_spi[GIC_NUM_SPI_INTR];
     Error *err = NULL;
 
+    ram_size = memory_region_size(s->ddr_ram);
+
+    /* Create the DDR Memory Regions. User friendly checks should happen at
+     * the board level
+     */
+    if (ram_size > XLNX_ZYNQMP_MAX_LOW_RAM_SIZE) {
+        /* The RAM size is above the maximum available for the low DDR.
+         * Create the high DDR memory region as well.
+         */
+        assert(ram_size <= XLNX_ZYNQMP_MAX_RAM_SIZE);
+        ddr_low_size = XLNX_ZYNQMP_MAX_LOW_RAM_SIZE;
+        ddr_high_size = ram_size - XLNX_ZYNQMP_MAX_LOW_RAM_SIZE;
+
+        memory_region_init_alias(&s->ddr_ram_high, NULL,
+                                 "ddr-ram-high", s->ddr_ram,
+                                  ddr_low_size, ddr_high_size);
+        memory_region_add_subregion(get_system_memory(),
+                                    XLNX_ZYNQMP_HIGH_RAM_START,
+                                    &s->ddr_ram_high);
+    } else {
+        /* RAM must be non-zero */
+        assert(ram_size);
+        ddr_low_size = ram_size;
+    }
+
+    memory_region_init_alias(&s->ddr_ram_low, NULL,
+                             "ddr-ram-low", s->ddr_ram,
+                              0, ddr_low_size);
+    memory_region_add_subregion(get_system_memory(), 0, &s->ddr_ram_low);
+
     /* Create the four OCM banks */
     for (i = 0; i < XLNX_ZYNQMP_NUM_OCM_BANKS; i++) {
         char *ocm_name = g_strdup_printf("zynqmp.ocm_ram_bank_%d", i);

include/hw/arm/xlnx-zynqmp.h

@@ -51,6 +51,14 @@
 #define XLNX_ZYNQMP_GIC_REGION_SIZE 0x1000
 #define XLNX_ZYNQMP_GIC_ALIASES     (0x10000 / XLNX_ZYNQMP_GIC_REGION_SIZE - 1)
 
+#define XLNX_ZYNQMP_MAX_LOW_RAM_SIZE    0x80000000ull
+
+#define XLNX_ZYNQMP_MAX_HIGH_RAM_SIZE   0x800000000ull
+#define XLNX_ZYNQMP_HIGH_RAM_START      0x800000000ull
+
+#define XLNX_ZYNQMP_MAX_RAM_SIZE (XLNX_ZYNQMP_MAX_LOW_RAM_SIZE + \
+                                  XLNX_ZYNQMP_MAX_HIGH_RAM_SIZE)
+
 typedef struct XlnxZynqMPState {
     /*< private >*/
     DeviceState parent_obj;
@@ -60,8 +68,12 @@ typedef struct XlnxZynqMPState {
     ARMCPU rpu_cpu[XLNX_ZYNQMP_NUM_RPU_CPUS];
     GICState gic;
     MemoryRegion gic_mr[XLNX_ZYNQMP_GIC_REGIONS][XLNX_ZYNQMP_GIC_ALIASES];
+
     MemoryRegion ocm_ram[XLNX_ZYNQMP_NUM_OCM_BANKS];
 
+    MemoryRegion *ddr_ram;
+    MemoryRegion ddr_ram_low, ddr_ram_high;
+
     CadenceGEMState gem[XLNX_ZYNQMP_NUM_GEMS];
     CadenceUARTState uart[XLNX_ZYNQMP_NUM_UARTS];
     SysbusAHCIState sata;