diff mbox

[v7,3/3] hw/arm/virt: add dynamic sysbus device support

Message ID 1418726555-20532-4-git-send-email-eric.auger@linaro.org
State New
Headers show

Commit Message

Auger Eric Dec. 16, 2014, 10:42 a.m. UTC 
Allows sysbus devices to be instantiated from command line by
using -device option. Machvirt creates a platform bus at init.
The dynamic sysbus devices are attached to this platform bus device.

The platform bus device registers a machine init done notifier
whose role will be to bind the dynamic sysbus devices. Indeed
dynamic sysbus devices are created after machine init.

machvirt also registers a notifier that will build the device
tree nodes for the platform bus and its children dynamic sysbus
devices.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Eric Auger <eric.auger@linaro.org>

---
v6 -> v7:
Take into account Shannon comments:
- remove PLATFORM_BUS_FIRST_IRQ macro
- correct platform bus size to 0x400000
- add an additional comment in a15irqmap related to
  PLATFORM_BUS_NUM_IRQS

v5 -> v6:
- Take into account Peter's comments:
  - platform_bus_params initialized from vbi->memmap and vbi->irqmap.
    As a consequence, const is removed. Also alignment in a15memmap
    is slightly changed.
  - ARMPlatformBusSystemParams handle removed from create_platform_bus
    prototype
- arm_load_kernel has become a machine init done notifier registration.
  It must be called before platform_bus_create to guarantee the correct
  notifier execution sequence

v4 -> v5:
- platform_bus_params becomes static const
- reword comment in create_platform_bus
- reword the commit message

v3 -> v4:
- use platform bus object, instantiated in create_platform_bus
- device tree generation for platform bus and children dynamic
  sysbus devices is no more handled at reset but in a
  machine_init_done_notifier (due to the change in implementaion
  of ARM load dtb using rom_add_blob_fixed).
- device tree enhancement now takes into account the case of
  user provided dtb. Before the user dtb was overwritten which
  was wrong. However in case the dtb is provided by the user,
  dynamic sysbus nodes are not added there.
- renaming of MACHVIRT_PLATFORM defines
- MACHVIRT_PLATFORM_PAGE_SHIFT and SIZE_PAGES not needed anymore,
  hence removed.
- DynSysbusParams struct renamed into ARMPlatformBusSystemParams
  and above params removed.
- separation of dt creation and QEMU binding is not mandated anymore
  since the device tree is not created from scratch anymore. Instead
  the modify_dtb function is used.
- create_platform_bus registers another machine init done notifier
  to start VFIO IRQ handling. This latter executes after the
  dynamic sysbus device binding.

v2 -> v3:
- renaming of arm_platform_bus_create_devtree and arm_load_dtb
- add copyright in hw/arm/dyn_sysbus_devtree.c

v1 -> v2:
- remove useless vfio-platform.h include file
- s/MACHVIRT_PLATFORM_HOLE/MACHVIRT_PLATFORM_SIZE
- use dyn_sysbus_binding and dyn_sysbus_devtree
- dynamic sysbus platform buse size shrinked to 4MB and
  moved between RTC and MMIO

v1:

Inspired from what Alex Graf did in ppc e500
https://lists.gnu.org/archive/html/qemu-ppc/2014-07/msg00012.html

Conflicts:
	hw/arm/sysbus-fdt.c
---
 hw/arm/virt.c | 96 ++++++++++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 79 insertions(+), 17 deletions(-)
diff mbox

Patch

diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 314e55b..5b30460 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -42,6 +42,8 @@ 
 #include "exec/address-spaces.h"
 #include "qemu/bitops.h"
 #include "qemu/error-report.h"
+#include "hw/arm/sysbus-fdt.h"
+#include "hw/platform-bus.h"
 
 #define NUM_VIRTIO_TRANSPORTS 32
 
@@ -59,6 +61,8 @@ 
 #define GIC_FDT_IRQ_PPI_CPU_START 8
 #define GIC_FDT_IRQ_PPI_CPU_WIDTH 8
 
+#define PLATFORM_BUS_NUM_IRQS     20
+
 enum {
     VIRT_FLASH,
     VIRT_MEM,
@@ -68,8 +72,11 @@  enum {
     VIRT_UART,
     VIRT_MMIO,
     VIRT_RTC,
+    VIRT_PLATFORM_BUS,
 };
 
+static ARMPlatformBusSystemParams platform_bus_params;
+
 typedef struct MemMapEntry {
     hwaddr base;
     hwaddr size;
@@ -100,23 +107,25 @@  typedef struct VirtBoardInfo {
  */
 static const MemMapEntry a15memmap[] = {
     /* Space up to 0x8000000 is reserved for a boot ROM */
-    [VIRT_FLASH] =      {          0, 0x08000000 },
-    [VIRT_CPUPERIPHS] = { 0x08000000, 0x00020000 },
+    [VIRT_FLASH] =          {          0, 0x08000000 },
+    [VIRT_CPUPERIPHS] =     { 0x08000000, 0x00020000 },
     /* GIC distributor and CPU interfaces sit inside the CPU peripheral space */
-    [VIRT_GIC_DIST] =   { 0x08000000, 0x00010000 },
-    [VIRT_GIC_CPU] =    { 0x08010000, 0x00010000 },
-    [VIRT_UART] =       { 0x09000000, 0x00001000 },
-    [VIRT_RTC] =        { 0x09010000, 0x00001000 },
-    [VIRT_MMIO] =       { 0x0a000000, 0x00000200 },
+    [VIRT_GIC_DIST] =       { 0x08000000, 0x00010000 },
+    [VIRT_GIC_CPU] =        { 0x08010000, 0x00010000 },
+    [VIRT_UART] =           { 0x09000000, 0x00001000 },
+    [VIRT_RTC] =            { 0x09010000, 0x00001000 },
+    [VIRT_PLATFORM_BUS] =   { 0x09400000, 0x00400000 },
+    [VIRT_MMIO] =           { 0x0a000000, 0x00000200 },
     /* ...repeating for a total of NUM_VIRTIO_TRANSPORTS, each of that size */
     /* 0x10000000 .. 0x40000000 reserved for PCI */
-    [VIRT_MEM] =        { 0x40000000, 30ULL * 1024 * 1024 * 1024 },
+    [VIRT_MEM] =            { 0x40000000, 30ULL * 1024 * 1024 * 1024 },
 };
 
 static const int a15irqmap[] = {
     [VIRT_UART] = 1,
     [VIRT_RTC] = 2,
     [VIRT_MMIO] = 16, /* ...to 16 + NUM_VIRTIO_TRANSPORTS - 1 */
+    [VIRT_PLATFORM_BUS] = 48, /* .. to 48 + PLATFORM_BUS_NUM_IRQS -1*/
 };
 
 static VirtBoardInfo machines[] = {
@@ -519,6 +528,47 @@  static void create_flash(const VirtBoardInfo *vbi)
     g_free(nodename);
 }
 
+static void create_platform_bus(VirtBoardInfo *vbi, qemu_irq *pic)
+{
+    DeviceState *dev;
+    SysBusDevice *s;
+    int i;
+    ARMPlatformBusFdtParams *fdt_params = g_new(ARMPlatformBusFdtParams, 1);
+    MemoryRegion *sysmem = get_system_memory();
+
+    platform_bus_params.platform_bus_base = vbi->memmap[VIRT_PLATFORM_BUS].base;
+    platform_bus_params.platform_bus_size = vbi->memmap[VIRT_PLATFORM_BUS].size;
+    platform_bus_params.platform_bus_first_irq = vbi->irqmap[VIRT_PLATFORM_BUS];
+    platform_bus_params.platform_bus_num_irqs = PLATFORM_BUS_NUM_IRQS;
+
+    fdt_params->system_params = &platform_bus_params;
+    fdt_params->binfo = &vbi->bootinfo;
+    fdt_params->intc = "/intc";
+    /*
+     * register a machine init done notifier that creates the device tree
+     * nodes of the platform bus and its children dynamic sysbus devices
+     */
+    arm_register_platform_bus_fdt_creator(fdt_params);
+
+    dev = qdev_create(NULL, TYPE_PLATFORM_BUS_DEVICE);
+    dev->id = TYPE_PLATFORM_BUS_DEVICE;
+    qdev_prop_set_uint32(dev, "num_irqs",
+        platform_bus_params.platform_bus_num_irqs);
+    qdev_prop_set_uint32(dev, "mmio_size",
+        platform_bus_params.platform_bus_size);
+    qdev_init_nofail(dev);
+    s = SYS_BUS_DEVICE(dev);
+
+    for (i = 0; i < platform_bus_params.platform_bus_num_irqs; i++) {
+        int irqn = platform_bus_params.platform_bus_first_irq + i;
+        sysbus_connect_irq(s, i, pic[irqn]);
+    }
+
+    memory_region_add_subregion(sysmem,
+                                platform_bus_params.platform_bus_base,
+                                sysbus_mmio_get_region(s, 0));
+}
+
 static void *machvirt_dtb(const struct arm_boot_info *binfo, int *fdt_size)
 {
     const VirtBoardInfo *board = (const VirtBoardInfo *)binfo;
@@ -581,6 +631,24 @@  static void machvirt_init(MachineState *machine)
 
         object_property_set_bool(cpuobj, true, "realized", NULL);
     }
+
+    /*
+     * register the arm_load_kernel machine init done notifier
+     * before platform_bus_create call.
+     * There, arm_register_platform_bus_fdt_creator registers another
+     * notifier that adds platform bus nodes. Notifiers are executed
+     * in registration reverse order.
+     */
+    vbi->bootinfo.ram_size = machine->ram_size;
+    vbi->bootinfo.kernel_filename = machine->kernel_filename;
+    vbi->bootinfo.kernel_cmdline = machine->kernel_cmdline;
+    vbi->bootinfo.initrd_filename = machine->initrd_filename;
+    vbi->bootinfo.nb_cpus = smp_cpus;
+    vbi->bootinfo.board_id = -1;
+    vbi->bootinfo.loader_start = vbi->memmap[VIRT_MEM].base;
+    vbi->bootinfo.get_dtb = machvirt_dtb;
+    arm_load_kernel(ARM_CPU(first_cpu), &vbi->bootinfo);
+
     fdt_add_timer_nodes(vbi);
     fdt_add_cpu_nodes(vbi);
     fdt_add_psci_node(vbi);
@@ -604,15 +672,8 @@  static void machvirt_init(MachineState *machine)
      */
     create_virtio_devices(vbi, pic);
 
-    vbi->bootinfo.ram_size = machine->ram_size;
-    vbi->bootinfo.kernel_filename = machine->kernel_filename;
-    vbi->bootinfo.kernel_cmdline = machine->kernel_cmdline;
-    vbi->bootinfo.initrd_filename = machine->initrd_filename;
-    vbi->bootinfo.nb_cpus = smp_cpus;
-    vbi->bootinfo.board_id = -1;
-    vbi->bootinfo.loader_start = vbi->memmap[VIRT_MEM].base;
-    vbi->bootinfo.get_dtb = machvirt_dtb;
-    arm_load_kernel(ARM_CPU(first_cpu), &vbi->bootinfo);
+    create_platform_bus(vbi, pic);
+
 }
 
 static QEMUMachine machvirt_a15_machine = {
@@ -620,6 +681,7 @@  static QEMUMachine machvirt_a15_machine = {
     .desc = "ARM Virtual Machine",
     .init = machvirt_init,
     .max_cpus = 8,
+    .has_dynamic_sysbus = true,
 };
 
 static void machvirt_machine_init(void)