Hi Chunyan,

I love your patch! Yet something to improve:

[auto build test ERROR on robh/for-next]
[also build test ERROR on v5.11-rc4 next-20210121]
[cannot apply to iommu/next]
[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]

url:    https://github.com/0day-ci/linux/commits/Chunyan-Zhang/Add-Unisoc-iommu-basic-driver/20210121-194023
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
config: arc-allyesconfig (attached as .config)
compiler: arceb-elf-gcc (GCC) 9.3.0
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/0day-ci/linux/commit/891db11d7229149235a02e5bc31a61188243a5d7
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Chunyan-Zhang/Add-Unisoc-iommu-basic-driver/20210121-194023
        git checkout 891db11d7229149235a02e5bc31a61188243a5d7
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   drivers/iommu/sprd-iommu.c: In function 'sprd_iommu_attach_device':
>> drivers/iommu/sprd-iommu.c:248:16: error: implicit declaration of function 'dma_alloc_coherent' [-Werror=implicit-function-declaration]
     248 |  dom->pgt_va = dma_alloc_coherent(sdev->dev, pgt_size, &dom->pgt_pa, GFP_KERNEL);
         |                ^~~~~~~~~~~~~~~~~~
   drivers/iommu/sprd-iommu.c:248:14: warning: assignment to 'u32 *' {aka 'unsigned int *'} from 'int' makes pointer from integer without a cast [-Wint-conversion]
     248 |  dom->pgt_va = dma_alloc_coherent(sdev->dev, pgt_size, &dom->pgt_pa, GFP_KERNEL);
         |              ^
   drivers/iommu/sprd-iommu.c: In function 'sprd_iommu_detach_device':
>> drivers/iommu/sprd-iommu.c:270:2: error: implicit declaration of function 'dma_free_coherent' [-Werror=implicit-function-declaration]
     270 |  dma_free_coherent(sdev->dev, pgt_size, dom->pgt_va, dom->pgt_pa);
         |  ^~~~~~~~~~~~~~~~~
   In file included from include/linux/device.h:15,
                    from drivers/iommu/sprd-iommu.c:10:
   drivers/iommu/sprd-iommu.c: In function 'sprd_iommu_map':
   drivers/iommu/sprd-iommu.c:296:27: warning: format '%lx' expects argument of type 'long unsigned int', but argument 4 has type 'size_t' {aka 'unsigned int'} [-Wformat=]
     296 |   dev_err(dom->sdev->dev, "(iova(0x%lx) + sixe(0x%lx)) are not in the range!\n",
         |                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/dev_printk.h:19:22: note: in definition of macro 'dev_fmt'
      19 | #define dev_fmt(fmt) fmt
         |                      ^~~
   drivers/iommu/sprd-iommu.c:296:3: note: in expansion of macro 'dev_err'
     296 |   dev_err(dom->sdev->dev, "(iova(0x%lx) + sixe(0x%lx)) are not in the range!\n",
         |   ^~~~~~~
   drivers/iommu/sprd-iommu.c:296:52: note: format string is defined here
     296 |   dev_err(dom->sdev->dev, "(iova(0x%lx) + sixe(0x%lx)) are not in the range!\n",
         |                                                  ~~^
         |                                                    |
         |                                                    long unsigned int
         |                                                  %x
   drivers/iommu/sprd-iommu.c:279:38: warning: variable 'mdata' set but not used [-Wunused-but-set-variable]
     279 |  const struct sprd_iommu_match_data *mdata;
         |                                      ^~~~~
   drivers/iommu/sprd-iommu.c: In function 'sprd_iommu_probe':
   drivers/iommu/sprd-iommu.c:483:21: warning: assignment to 'u32 *' {aka 'unsigned int *'} from 'int' makes pointer from integer without a cast [-Wint-conversion]
     483 |  sdev->prot_page_va = dma_alloc_coherent(dev, SPRD_IOMMU_PAGE_SIZE,
         |                     ^
   cc1: some warnings being treated as errors


vim +/dma_alloc_coherent +248 drivers/iommu/sprd-iommu.c

   240	
   241	static int sprd_iommu_attach_device(struct iommu_domain *domain,
   242					    struct device *dev)
   243	{
   244		struct sprd_iommu_device *sdev = dev_iommu_priv_get(dev);
   245		struct sprd_iommu_domain *dom = to_sprd_domain(domain);
   246		size_t pgt_size = sprd_iommu_pgt_size(domain);
   247	
 > 248		dom->pgt_va = dma_alloc_coherent(sdev->dev, pgt_size, &dom->pgt_pa, GFP_KERNEL);
   249		if (!dom->pgt_va)
   250			return -ENOMEM;
   251	
   252		dom->sdev = sdev;
   253	
   254		sprd_iommu_first_ppn(dom);
   255		sprd_iommu_first_vpn(dom);
   256		sprd_iommu_vpn_range(dom);
   257		sprd_iommu_default_ppn(sdev);
   258		sprd_iommu_hw_en(sdev, true);
   259	
   260		return 0;
   261	}
   262	
   263	static void sprd_iommu_detach_device(struct iommu_domain *domain,
   264						     struct device *dev)
   265	{
   266		struct sprd_iommu_domain *dom = to_sprd_domain(domain);
   267		struct sprd_iommu_device *sdev = dom->sdev;
   268		size_t pgt_size = sprd_iommu_pgt_size(domain);
   269	
 > 270		dma_free_coherent(sdev->dev, pgt_size, dom->pgt_va, dom->pgt_pa);
   271		sprd_iommu_hw_en(sdev, false);
   272		dom->sdev = NULL;
   273	}
   274	

---
0-DAY CI Kernel Test Service, Intel Corporation
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