[PATCH for-5.0 v11 12/20] qapi: Introduce DEFINE_PROP_INTERVAL

[Eric Auger <eric.auger@redhat.com>]

Introduce a new property defining a labelled interval:
<low address>,<high address>,label.

This will be used to encode reserved IOVA regions. The label
is left undefined to ease reuse accross use cases.

For instance, in virtio-iommu use case, reserved IOVA regions
will be passed by the machine code to the virtio-iommu-pci
device (an array of those). The label will match the
virtio_iommu_probe_resv_mem subtype value:
- VIRTIO_IOMMU_RESV_MEM_T_RESERVED (0)
- VIRTIO_IOMMU_RESV_MEM_T_MSI (1)

This is used to inform the virtio-iommu-pci device it should
bypass the MSI region: 0xfee00000, 0xfeefffff, 1.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
 hw/core/qdev-properties.c    | 90 ++++++++++++++++++++++++++++++++++++
 include/exec/memory.h        |  6 +++
 include/hw/qdev-properties.h |  3 ++
 include/qemu/typedefs.h      |  1 +
 4 files changed, 100 insertions(+)

diff --git a/hw/core/qdev-properties.c b/hw/core/qdev-properties.c
index ac28890e5a..8d70f34e37 100644
--- a/hw/core/qdev-properties.c
+++ b/hw/core/qdev-properties.c
@@ -13,6 +13,7 @@
 #include "qapi/visitor.h"
 #include "chardev/char.h"
 #include "qemu/uuid.h"
+#include "qemu/cutils.h"
 
 void qdev_prop_set_after_realize(DeviceState *dev, const char *name,
                                   Error **errp)
@@ -585,6 +586,95 @@ const PropertyInfo qdev_prop_macaddr = {
     .set   = set_mac,
 };
 
+/* --- Labelled Interval --- */
+
+/*
+ * accepted syntax versions:
+ *   <low address>,<high address>,<type>
+ *   where low/high addresses are uint64_t in hexa (feat. 0x prefix)
+ *   and type is an unsigned integer
+ */
+static void get_interval(Object *obj, Visitor *v, const char *name,
+                         void *opaque, Error **errp)
+{
+    DeviceState *dev = DEVICE(obj);
+    Property *prop = opaque;
+    Interval *interval = qdev_get_prop_ptr(dev, prop);
+    char buffer[64];
+    char *p = buffer;
+
+    snprintf(buffer, sizeof(buffer), "0x%"PRIx64",0x%"PRIx64",%d",
+             interval->low, interval->high, interval->type);
+
+    visit_type_str(v, name, &p, errp);
+}
+
+static void set_interval(Object *obj, Visitor *v, const char *name,
+                         void *opaque, Error **errp)
+{
+    DeviceState *dev = DEVICE(obj);
+    Property *prop = opaque;
+    Interval *interval = qdev_get_prop_ptr(dev, prop);
+    Error *local_err = NULL;
+    unsigned int type;
+    gchar **fields;
+    uint64_t addr;
+    char *str;
+    int ret;
+
+    if (dev->realized) {
+        qdev_prop_set_after_realize(dev, name, errp);
+        return;
+    }
+
+    visit_type_str(v, name, &str, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return;
+    }
+
+    fields = g_strsplit(str, ",", 3);
+
+    ret = qemu_strtou64(fields[0], NULL, 16, &addr);
+    if (!ret) {
+        interval->low = addr;
+    } else {
+        error_setg(errp, "Failed to decode interval low addr");
+        error_append_hint(errp,
+                          "should be an address in hexa with 0x prefix\n");
+        goto out;
+    }
+
+    ret = qemu_strtou64(fields[1], NULL, 16, &addr);
+    if (!ret) {
+        interval->high = addr;
+    } else {
+        error_setg(errp, "Failed to decode interval high addr");
+        error_append_hint(errp,
+                          "should be an address in hexa with 0x prefix\n");
+        goto out;
+    }
+
+    ret = qemu_strtoui(fields[2], NULL, 10, &type);
+    if (!ret) {
+        interval->type = type;
+    } else {
+        error_setg(errp, "Failed to decode interval type");
+        error_append_hint(errp, "should be an unsigned int in decimal\n");
+    }
+out:
+    g_free(str);
+    g_strfreev(fields);
+    return;
+}
+
+const PropertyInfo qdev_prop_interval = {
+    .name  = "labelled_interval",
+    .description = "Labelled interval, example: 0xFEE00000,0xFEEFFFFF,0",
+    .get   = get_interval,
+    .set   = set_interval,
+};
+
 /* --- on/off/auto --- */
 
 const PropertyInfo qdev_prop_on_off_auto = {
diff --git a/include/exec/memory.h b/include/exec/memory.h
index e499dc215b..e238d1c352 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -57,6 +57,12 @@ struct MemoryRegionMmio {
     CPUWriteMemoryFunc *write[3];
 };
 
+struct Interval {
+    hwaddr low;
+    hwaddr high;
+    unsigned int type;
+};
+
 typedef struct IOMMUTLBEntry IOMMUTLBEntry;
 
 /* See address_space_translate: bit 0 is read, bit 1 is write.  */
diff --git a/include/hw/qdev-properties.h b/include/hw/qdev-properties.h
index c6a8cb5516..2ba7c8711b 100644
--- a/include/hw/qdev-properties.h
+++ b/include/hw/qdev-properties.h
@@ -20,6 +20,7 @@ extern const PropertyInfo qdev_prop_chr;
 extern const PropertyInfo qdev_prop_tpm;
 extern const PropertyInfo qdev_prop_ptr;
 extern const PropertyInfo qdev_prop_macaddr;
+extern const PropertyInfo qdev_prop_interval;
 extern const PropertyInfo qdev_prop_on_off_auto;
 extern const PropertyInfo qdev_prop_losttickpolicy;
 extern const PropertyInfo qdev_prop_blockdev_on_error;
@@ -202,6 +203,8 @@ extern const PropertyInfo qdev_prop_pcie_link_width;
     DEFINE_PROP(_n, _s, _f, qdev_prop_drive_iothread, BlockBackend *)
 #define DEFINE_PROP_MACADDR(_n, _s, _f)         \
     DEFINE_PROP(_n, _s, _f, qdev_prop_macaddr, MACAddr)
+#define DEFINE_PROP_INTERVAL(_n, _s, _f)         \
+    DEFINE_PROP(_n, _s, _f, qdev_prop_interval, Interval)
 #define DEFINE_PROP_ON_OFF_AUTO(_n, _s, _f, _d) \
     DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_on_off_auto, OnOffAuto)
 #define DEFINE_PROP_LOSTTICKPOLICY(_n, _s, _f, _d) \
diff --git a/include/qemu/typedefs.h b/include/qemu/typedefs.h
index 375770a80f..a827c9a3fe 100644
--- a/include/qemu/typedefs.h
+++ b/include/qemu/typedefs.h
@@ -58,6 +58,7 @@ typedef struct ISABus ISABus;
 typedef struct ISADevice ISADevice;
 typedef struct IsaDma IsaDma;
 typedef struct MACAddr MACAddr;
+typedef struct Interval Interval;
 typedef struct MachineClass MachineClass;
 typedef struct MachineState MachineState;
 typedef struct MemoryListener MemoryListener;
-- 
2.20.1