[PATCH] drm/amdgpu: Implement mmap of imported dma-bufs

[kernel test robot]

Hi Marek,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on drm-misc/drm-misc-next]
[also build test WARNING on drm/drm-next drm-intel/for-linux-next drm-tip/drm-tip linus/master next-20230303]
[cannot apply to drm-intel/for-linux-next-fixes v6.2]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Marek-Maslanka/drm-amdgpu-Implement-mmap-of-imported-dma-bufs/20230303-191145
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    https://lore.kernel.org/r/20230303110951.3777850-1-mmaslanka%40chromium.org
patch subject: [PATCH] drm/amdgpu: Implement mmap of imported dma-bufs
config: sparc-allyesconfig (https://download.01.org/0day-ci/archive/20230303/202303032218.9kvEePUv-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/2916257baab842afa387781faf1b595b73249767
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Marek-Maslanka/drm-amdgpu-Implement-mmap-of-imported-dma-bufs/20230303-191145
        git checkout 2916257baab842afa387781faf1b595b73249767
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=sparc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=sparc SHELL=/bin/bash drivers/gpu/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp at intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303032218.9kvEePUv-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c: In function 'amdgpu_try_dma_buf_mmap':
>> drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c:286:27: warning: variable 'bo' set but not used [-Wunused-but-set-variable]
     286 |         struct amdgpu_bo *bo = NULL;
         |                           ^~
   In file included from drivers/gpu/drm/amd/amdgpu/../display/dc/dc_types.h:36,
                    from drivers/gpu/drm/amd/amdgpu/../display/dc/dm_services_types.h:30,
                    from drivers/gpu/drm/amd/amdgpu/../include/dm_pp_interface.h:26,
                    from drivers/gpu/drm/amd/amdgpu/amdgpu.h:64,
                    from drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c:34:
   drivers/gpu/drm/amd/amdgpu/../display/dc/dc_hdmi_types.h: At top level:
   drivers/gpu/drm/amd/amdgpu/../display/dc/dc_hdmi_types.h:53:22: warning: 'dp_hdmi_dongle_signature_str' defined but not used [-Wunused-const-variable=]
      53 | static const uint8_t dp_hdmi_dongle_signature_str[] = "DP-HDMI ADAPTOR";
         |                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/bo +286 drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c

   278	
   279	int amdgpu_try_dma_buf_mmap(struct file *filp, struct vm_area_struct *vma)
   280	{
   281		struct drm_file *priv = filp->private_data;
   282		struct drm_device *dev = priv->minor->dev;
   283		struct amdgpu_device *adev = drm_to_adev(dev);
   284		struct ttm_device *bdev = &adev->mman.bdev;
   285		struct ttm_buffer_object *tbo = NULL;
 > 286		struct amdgpu_bo *bo = NULL;
   287		struct drm_gem_object *obj = NULL;
   288		struct drm_vma_offset_node *node;
   289		int ret;
   290	
   291		if (drm_dev_is_unplugged(dev))
   292			return -ENODEV;
   293	
   294		drm_vma_offset_lock_lookup(bdev->vma_manager);
   295		node = drm_vma_offset_exact_lookup_locked(bdev->vma_manager,
   296							  vma->vm_pgoff,
   297							  vma_pages(vma));
   298	
   299		if (likely(node)) {
   300			tbo = container_of(node, struct ttm_buffer_object,
   301					   base.vma_node);
   302			tbo = ttm_bo_get_unless_zero(tbo);
   303		}
   304		drm_vma_offset_unlock_lookup(bdev->vma_manager);
   305	
   306		if (!tbo)
   307			return -EINVAL;
   308	
   309		bo = ttm_to_amdgpu_bo(tbo);
   310		obj = &tbo->base;
   311	
   312		if (!obj->import_attach) {
   313			ret = -EINVAL;
   314			goto done;
   315		}
   316	
   317		ret = dma_buf_mmap(obj->import_attach->dmabuf, vma, 0);
   318	
   319	done:
   320		ttm_bo_put(tbo);
   321		return ret;
   322	}
   323	

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