accel/ivpu: Add fdinfo support for memory statistics

Implement DRM fdinfo interface to expose memory usage statistics
for NPU device file descriptors. Exclude unpinned and imported
buffers from resident memory calculations to provide accurate
memory usage reporting.

Reviewed-by: Jeff Hugo <[e-mail]>
Signed-off-by: Karol Wachowski <[e-mail]>
Link: https://patch.msgid.link/[e-mail]

drivers/accel/ivpu/ivpu_drv.c

···
 static const struct file_operations ivpu_fops = {
 	.owner		= THIS_MODULE,
 	DRM_ACCEL_FOPS,
+#if CONFIG_PROC_FS
+	.show_fdinfo = drm_show_fdinfo,
+#endif
 };
 
 static const struct drm_driver driver = {
···
 	.ioctls = ivpu_drm_ioctls,
 	.num_ioctls = ARRAY_SIZE(ivpu_drm_ioctls),
 	.fops = &ivpu_fops,
+#if CONFIG_PROC_FS
+	.show_fdinfo = drm_show_memory_stats,
+#endif
 
 	.name = DRIVER_NAME,
 	.desc = DRIVER_DESC,

drivers/accel/ivpu/ivpu_gem.c

···
 	drm_gem_shmem_free(&bo->base);
 }
 
+static enum drm_gem_object_status ivpu_gem_status(struct drm_gem_object *obj)
+{
+	struct ivpu_bo *bo = to_ivpu_bo(obj);
+	enum drm_gem_object_status status = 0;
+
+	if (ivpu_bo_is_resident(bo))
+		status |= DRM_GEM_OBJECT_RESIDENT;
+
+	return status;
+}
+
 static const struct drm_gem_object_funcs ivpu_gem_funcs = {
 	.free = ivpu_gem_bo_free,
 	.open = ivpu_gem_bo_open,
···
 	.vmap = drm_gem_shmem_object_vmap,
 	.vunmap = drm_gem_shmem_object_vunmap,
 	.mmap = drm_gem_shmem_object_mmap,
+	.status = ivpu_gem_status,
 	.vm_ops = &drm_gem_shmem_vm_ops,
 };
 

drivers/accel/ivpu/ivpu_gem.h

···
 	return bo->flags & DRM_IVPU_BO_READ_ONLY;
 }
 
+static inline bool ivpu_bo_is_resident(struct ivpu_bo *bo)
+{
+	return !!bo->base.pages;
+}
+
 static inline void *ivpu_to_cpu_addr(struct ivpu_bo *bo, u32 vpu_addr)
 {
 	if (vpu_addr < bo->vpu_addr)