xa_erase(drm_minor_get_xa(minor->type), minor->index);
}
+/*
+ * DRM used to support 64 devices, for backwards compatibility we need to maintain the
+ * minor allocation scheme where minors 0-63 are primary nodes, 64-127 are control nodes,
+ * and 128-191 are render nodes.
+ * After reaching the limit, we're allocating minors dynamically - first-come, first-serve.
+ * Accel nodes are using a distinct major, so the minors are allocated in continuous 0-MAX
+ * range.
+ */
#define DRM_MINOR_LIMIT(t) ({ \
typeof(t) _t = (t); \
_t == DRM_MINOR_ACCEL ? XA_LIMIT(0, ACCEL_MAX_MINORS) : XA_LIMIT(64 * _t, 64 * _t + 63); \
})
+#define DRM_EXTENDED_MINOR_LIMIT XA_LIMIT(192, (1 << MINORBITS) - 1)
static int drm_minor_alloc(struct drm_device *dev, enum drm_minor_type type)
{
r = xa_alloc(drm_minor_get_xa(type), &minor->index,
NULL, DRM_MINOR_LIMIT(type), GFP_KERNEL);
+ if (r == -EBUSY && (type == DRM_MINOR_PRIMARY || type == DRM_MINOR_RENDER))
+ r = xa_alloc(&drm_minors_xa, &minor->index,
+ NULL, DRM_EXTENDED_MINOR_LIMIT, GFP_KERNEL);
if (r < 0)
return r;