drm/gpuvm: export drm_gpuvm_range_valid()

Drivers may use this function to validate userspace requests in advance,
hence export it.

Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Danilo Krummrich <dakr@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231108001259.15123-4-dakr@redhat.com

drivers/gpu/drm/drm_gpuvm.c

@@ -649,7 +649,18 @@ drm_gpuvm_in_kernel_node(struct drm_gpuvm *gpuvm, u64 addr, u64 range)
 	return krange && addr < kend && kstart < end;
 }
 
-static bool
+/**
+ * drm_gpuvm_range_valid() - checks whether the given range is valid for the
+ * given &drm_gpuvm
+ * @gpuvm: the GPUVM to check the range for
+ * @addr: the base address
+ * @range: the range starting from the base address
+ *
+ * Checks whether the range is within the GPUVM's managed boundaries.
+ *
+ * Returns: true for a valid range, false otherwise
+ */
+bool
 drm_gpuvm_range_valid(struct drm_gpuvm *gpuvm,
 		      u64 addr, u64 range)
 {
@@ -657,6 +668,7 @@ drm_gpuvm_range_valid(struct drm_gpuvm *gpuvm,
 	       drm_gpuvm_in_mm_range(gpuvm, addr, range) &&
 	       !drm_gpuvm_in_kernel_node(gpuvm, addr, range);
 }
+EXPORT_SYMBOL_GPL(drm_gpuvm_range_valid);
 
 /**
  * drm_gpuvm_init() - initialize a &drm_gpuvm

include/drm/drm_gpuvm.h

@@ -253,6 +253,7 @@ void drm_gpuvm_init(struct drm_gpuvm *gpuvm, const char *name,
 		    const struct drm_gpuvm_ops *ops);
 void drm_gpuvm_destroy(struct drm_gpuvm *gpuvm);
 
+bool drm_gpuvm_range_valid(struct drm_gpuvm *gpuvm, u64 addr, u64 range);
 bool drm_gpuvm_interval_empty(struct drm_gpuvm *gpuvm, u64 addr, u64 range);
 
 static inline struct drm_gpuva *