[PATCH V6 1/3] libxl: arm: Create alloc_virtio_mmio_params()

[Viresh Kumar <viresh.kumar@linaro.org>]

In order to prepare for adding support for more device types, create a
separate routine to allocate base and irq for a device as the same code
will be required for other device types too.

Also move updates to virtio_irq and virtio_enabled out of the disk
device specific block, as they will depend on other device types too.

Suggested-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Reviewed-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
 tools/libs/light/libxl_arm.c | 47 +++++++++++++++++++++++++-----------
 1 file changed, 33 insertions(+), 14 deletions(-)

diff --git a/tools/libs/light/libxl_arm.c b/tools/libs/light/libxl_arm.c
index 1a3ac1646e94..cc30ba124918 100644
--- a/tools/libs/light/libxl_arm.c
+++ b/tools/libs/light/libxl_arm.c
@@ -48,6 +48,24 @@ static uint32_t alloc_virtio_mmio_irq(libxl__gc *gc, uint32_t *virtio_mmio_irq)
     return irq;
 }
 
+static int alloc_virtio_mmio_params(libxl__gc *gc, uint64_t *base,
+                                    uint32_t *irq, uint64_t *virtio_mmio_base,
+                                    uint32_t *virtio_mmio_irq)
+{
+    *base = alloc_virtio_mmio_base(gc, virtio_mmio_base);
+    if (!*base)
+        return ERROR_FAIL;
+
+    *irq = alloc_virtio_mmio_irq(gc, virtio_mmio_irq);
+    if (!*irq)
+        return ERROR_FAIL;
+
+    LOG(DEBUG, "Allocate Virtio MMIO params: IRQ %u BASE 0x%"PRIx64, *irq,
+        *base);
+
+    return 0;
+}
+
 static const char *gicv_to_string(libxl_gic_version gic_version)
 {
     switch (gic_version) {
@@ -70,6 +88,7 @@ int libxl__arch_domain_prepare_config(libxl__gc *gc,
     bool vuart_enabled = false, virtio_enabled = false;
     uint64_t virtio_mmio_base = GUEST_VIRTIO_MMIO_BASE;
     uint32_t virtio_mmio_irq = GUEST_VIRTIO_MMIO_SPI_FIRST;
+    int rc;
 
     /*
      * If pl011 vuart is enabled then increment the nr_spis to allow allocation
@@ -85,20 +104,12 @@ int libxl__arch_domain_prepare_config(libxl__gc *gc,
         libxl_device_disk *disk = &d_config->disks[i];
 
         if (disk->specification == LIBXL_DISK_SPECIFICATION_VIRTIO) {
-            disk->base = alloc_virtio_mmio_base(gc, &virtio_mmio_base);
-            if (!disk->base)
-                return ERROR_FAIL;
-
-            disk->irq = alloc_virtio_mmio_irq(gc, &virtio_mmio_irq);
-            if (!disk->irq)
-                return ERROR_FAIL;
-
-            if (virtio_irq < disk->irq)
-                virtio_irq = disk->irq;
-            virtio_enabled = true;
+            rc = alloc_virtio_mmio_params(gc, &disk->base, &disk->irq,
+                                          &virtio_mmio_base,
+                                          &virtio_mmio_irq);
 
-            LOG(DEBUG, "Allocate Virtio MMIO params for Vdev %s: IRQ %u BASE 0x%"PRIx64,
-                disk->vdev, disk->irq, disk->base);
+            if (rc)
+                return rc;
         }
     }
 
@@ -107,8 +118,16 @@ int libxl__arch_domain_prepare_config(libxl__gc *gc,
      * present, make sure that we allocate enough SPIs for them.
      * The resulting "nr_spis" needs to cover the highest possible SPI.
      */
-    if (virtio_enabled)
+    if (virtio_mmio_irq != GUEST_VIRTIO_MMIO_SPI_FIRST) {
+        virtio_enabled = true;
+
+        /*
+         * Assumes that "virtio_mmio_irq" is the highest allocated irq, which is
+         * updated from alloc_virtio_mmio_irq() currently.
+         */
+        virtio_irq = virtio_mmio_irq - 1;
         nr_spis = max(nr_spis, virtio_irq - 32 + 1);
+    }
 
     for (i = 0; i < d_config->b_info.num_irqs; i++) {
         uint32_t irq = d_config->b_info.irqs[i];
-- 
2.31.1.272.g89b43f80a514