[Qemu-devel] [PATCH v5 10/10] hw/arm/dyn_sysbus_devtree: enable simple VFIO dynamic instantiation

[Eric Auger <eric.auger@linaro.org>]

Generates the device node of VFIO devices, if any are invoked in
-device option. In case VFIO devices require more complex node
generation, they can be handled before.

Signed-off-by: Eric Auger <eric.auger@linaro.org>
---
 hw/arm/dyn_sysbus_devtree.c | 138 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 138 insertions(+)

diff --git a/hw/arm/dyn_sysbus_devtree.c b/hw/arm/dyn_sysbus_devtree.c
index 56af62f..ac34f07 100644
--- a/hw/arm/dyn_sysbus_devtree.c
+++ b/hw/arm/dyn_sysbus_devtree.c
@@ -1,6 +1,139 @@
 #include "hw/arm/dyn_sysbus_devtree.h"
 #include "qemu/error-report.h"
 #include "sysemu/device_tree.h"
+#include "hw/vfio/vfio-platform.h"
+
+static void vfio_fdt_add_device_node(SysBusDevice *sbdev, void *opaque);
+
+static char *format_compat(char * compat)
+{
+    char *str_ptr, *corrected_compat;
+    /*
+     * process compatibility property string passed by end-user
+     * replaces / by , and ; by NUL character
+     */
+    corrected_compat = g_strdup(compat);
+    /*
+     * the total length of the string has to include also the last
+     * NUL char.
+     */
+
+    str_ptr = corrected_compat;
+    while ((str_ptr = strchr(str_ptr, '/')) != NULL) {
+        *str_ptr = ',';
+    }
+
+    /* substitute ";" with the NUL char */
+    str_ptr = corrected_compat;
+    while ((str_ptr = strchr(str_ptr, ';')) != NULL) {
+        *str_ptr = '\0';
+    }
+
+    return corrected_compat;
+}
+
+static void wrap_vfio_fdt_add_node(SysBusDevice *sbdev, void *opaque)
+{
+    PlatformDevtreeData *data = opaque;
+    VFIOPlatformDevice *vdev = VFIO_PLATFORM_DEVICE(sbdev);
+    VFIODevice *vbasedev = &vdev->vbasedev;
+    gchar irq_number_prop[8];
+    Object *obj = OBJECT(sbdev);
+    char *corrected_compat;
+    uint64_t irq_number;
+    int compat_str_len = strlen(vdev->compat)+1;
+    int i;
+
+    corrected_compat = format_compat(vdev->compat);
+    snprintf(vdev->compat, compat_str_len, "%s", corrected_compat);
+    g_free(corrected_compat);
+
+    vfio_fdt_add_device_node(sbdev, opaque);
+
+    for (i = 0; i < vbasedev->num_irqs; i++) {
+        snprintf(irq_number_prop, sizeof(irq_number_prop), "irq[%d]", i);
+        irq_number = object_property_get_int(obj, irq_number_prop, NULL)
+                                                 + data->irq_start;
+        /*
+         * for setting irqfd up we must provide the virtual IRQ number
+         * which is the sum of irq_start and actual platform bus irq
+         * index. At realize point we do not have this info.
+         */
+        if (vdev->irqfd_allowed) {
+            vfio_setup_irqfd(sbdev, i, irq_number);
+        }
+    }
+}
+
+static void vfio_fdt_add_device_node(SysBusDevice *sbdev, void *opaque)
+{
+    PlatformDevtreeData *data = opaque;
+    void *fdt = data->fdt;
+    const char *parent_node = data->node;
+    int compat_str_len;
+    char *nodename;
+    int i, ret;
+    uint32_t *irq_attr;
+    uint64_t *reg_attr;
+    uint64_t mmio_base;
+    uint64_t irq_number;
+    gchar mmio_base_prop[8];
+    gchar irq_number_prop[8];
+    VFIOPlatformDevice *vdev = VFIO_PLATFORM_DEVICE(sbdev);
+    VFIODevice *vbasedev = &vdev->vbasedev;
+    Object *obj = OBJECT(sbdev);
+
+    mmio_base = object_property_get_int(obj, "mmio[0]", NULL);
+
+    nodename = g_strdup_printf("%s/%s@%" PRIx64, parent_node,
+                               vbasedev->name,
+                               mmio_base);
+
+    qemu_fdt_add_subnode(fdt, nodename);
+
+    compat_str_len = strlen(vdev->compat) + 1;
+    qemu_fdt_setprop(fdt, nodename, "compatible",
+                            vdev->compat, compat_str_len);
+
+    reg_attr = g_new(uint64_t, vbasedev->num_regions*4);
+
+    for (i = 0; i < vbasedev->num_regions; i++) {
+        snprintf(mmio_base_prop, sizeof(mmio_base_prop), "mmio[%d]", i);
+        mmio_base = object_property_get_int(obj, mmio_base_prop, NULL);
+        reg_attr[2*i] = 1;
+        reg_attr[2*i+1] = mmio_base;
+        reg_attr[2*i+2] = 1;
+        reg_attr[2*i+3] = memory_region_size(&vdev->regions[i]->mem);
+    }
+
+    ret = qemu_fdt_setprop_sized_cells_from_array(fdt, nodename, "reg",
+                     vbasedev->num_regions*2, reg_attr);
+    if (ret < 0) {
+        error_report("could not set reg property of node %s", nodename);
+    }
+
+    irq_attr = g_new(uint32_t, vbasedev->num_irqs*3);
+
+    for (i = 0; i < vbasedev->num_irqs; i++) {
+        snprintf(irq_number_prop, sizeof(irq_number_prop), "irq[%d]", i);
+        irq_number = object_property_get_int(obj, irq_number_prop, NULL)
+                                                 + data->irq_start;
+        irq_attr[3*i] = cpu_to_be32(0);
+        irq_attr[3*i+1] = cpu_to_be32(irq_number);
+        irq_attr[3*i+2] = cpu_to_be32(0x4);
+    }
+
+   ret = qemu_fdt_setprop(fdt, nodename, "interrupts",
+                     irq_attr, vbasedev->num_irqs*3*sizeof(uint32_t));
+    if (ret < 0) {
+        error_report("could not set interrupts property of node %s",
+                     nodename);
+    }
+
+    g_free(nodename);
+    g_free(irq_attr);
+    g_free(reg_attr);
+}
 
 int sysbus_device_create_devtree(Object *obj, void *opaque)
 {
@@ -17,6 +150,11 @@ int sysbus_device_create_devtree(Object *obj, void *opaque)
         return object_child_foreach(obj, sysbus_device_create_devtree, data);
     }
 
+    if (object_dynamic_cast(obj, TYPE_VFIO_PLATFORM)) {
+        wrap_vfio_fdt_add_node(sbdev, data);
+        matched = true;
+    }
+
     if (!matched) {
         error_report("Device %s is not supported by this machine yet.",
                      qdev_fw_name(DEVICE(dev)));
-- 
1.8.3.2