Re: [PATCH] drm/ttm: Make sure the mapped tt pages are decrypted when needed

[kernel test robot <lkp@xxxxxxxxx>]

Hi Zack,

kernel test robot noticed the following build errors:

[auto build test ERROR on linus/master]
[also build test ERROR on v6.6-rc3 next-20230926]
[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/Zack-Rusin/drm-ttm-Make-sure-the-mapped-tt-pages-are-decrypted-when-needed/20230926-120619
base:   linus/master
patch link:    https://lore.kernel.org/r/20230926040359.3040017-1-zack%40kde.org
patch subject: [PATCH] drm/ttm: Make sure the mapped tt pages are decrypted when needed
config: mips-allyesconfig (https://download.01.org/0day-ci/archive/20230926/202309261923.XeaDU2Wg-lkp@xxxxxxxxx/config)
compiler: mips-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230926/202309261923.XeaDU2Wg-lkp@xxxxxxxxx/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202309261923.XeaDU2Wg-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

   drivers/gpu/drm/ttm/ttm_tt.c: In function 'ttm_tt_create':
>> drivers/gpu/drm/ttm/ttm_tt.c:89:41: error: implicit declaration of function 'cc_platform_has' [-Werror=implicit-function-declaration]
      89 |         if (bdev->pool.use_dma_alloc && cc_platform_has(CC_ATTR_MEM_ENCRYPT))
         |                                         ^~~~~~~~~~~~~~~
>> drivers/gpu/drm/ttm/ttm_tt.c:89:57: error: 'CC_ATTR_MEM_ENCRYPT' undeclared (first use in this function)
      89 |         if (bdev->pool.use_dma_alloc && cc_platform_has(CC_ATTR_MEM_ENCRYPT))
         |                                                         ^~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/ttm/ttm_tt.c:89:57: note: each undeclared identifier is reported only once for each function it appears in
   cc1: some warnings being treated as errors


vim +/cc_platform_has +89 drivers/gpu/drm/ttm/ttm_tt.c

    56	
    57	/*
    58	 * Allocates a ttm structure for the given BO.
    59	 */
    60	int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc)
    61	{
    62		struct ttm_device *bdev = bo->bdev;
    63		uint32_t page_flags = 0;
    64	
    65		dma_resv_assert_held(bo->base.resv);
    66	
    67		if (bo->ttm)
    68			return 0;
    69	
    70		switch (bo->type) {
    71		case ttm_bo_type_device:
    72			if (zero_alloc)
    73				page_flags |= TTM_TT_FLAG_ZERO_ALLOC;
    74			break;
    75		case ttm_bo_type_kernel:
    76			break;
    77		case ttm_bo_type_sg:
    78			page_flags |= TTM_TT_FLAG_EXTERNAL;
    79			break;
    80		default:
    81			pr_err("Illegal buffer object type\n");
    82			return -EINVAL;
    83		}
    84		/*
    85		 * When using dma_alloc_coherent with memory encryption the
    86		 * mapped TT pages need to be decrypted or otherwise the drivers
    87		 * will end up sending encrypted mem to the gpu.
    88		 */
  > 89		if (bdev->pool.use_dma_alloc && cc_platform_has(CC_ATTR_MEM_ENCRYPT))
    90			page_flags |= TTM_TT_FLAG_DECRYPTED;
    91	
    92		bo->ttm = bdev->funcs->ttm_tt_create(bo, page_flags);
    93		if (unlikely(bo->ttm == NULL))
    94			return -ENOMEM;
    95	
    96		WARN_ON(bo->ttm->page_flags & TTM_TT_FLAG_EXTERNAL_MAPPABLE &&
    97			!(bo->ttm->page_flags & TTM_TT_FLAG_EXTERNAL));
    98	
    99		return 0;
   100	}
   101	

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