[PATCH 1/2] iommu/debug: Add IOMMU page table dump debug facility

[kernel test robot]

Hi Qinxin,

kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-everything]
[also build test ERROR on linus/master v6.17-rc1 next-20250815]
[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/Qinxin-Xia/iommu-debug-Add-IOMMU-page-table-dump-debug-facility/20250814-173720
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20250814093005.2040511-2-xiaqinxin%40huawei.com
patch subject: [PATCH 1/2] iommu/debug: Add IOMMU page table dump debug facility
config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20250815/202508151711.pZGu9jac-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250815/202508151711.pZGu9jac-lkp@intel.com/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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202508151711.pZGu9jac-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/iommu/iommu.c: In function 'iommu_iova_info_dump':
>> drivers/iommu/iommu.c:1093:17: error: implicit declaration of function 'iommu_domain_to_iovad'; did you mean 'iommu_domain_type_str'? [-Wimplicit-function-declaration]
    1093 |         iovad = iommu_domain_to_iovad(domain);
         |                 ^~~~~~~~~~~~~~~~~~~~~
         |                 iommu_domain_type_str
>> drivers/iommu/iommu.c:1093:15: error: assignment to 'struct iova_domain *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
    1093 |         iovad = iommu_domain_to_iovad(domain);
         |               ^


vim +1093 drivers/iommu/iommu.c

  1078	
  1079	/**
  1080	 * iova_info_dump - dump iova alloced
  1081	 * @s - file structure used to generate serialized output
  1082	 * @iovad: - iova domain in question.
  1083	 */
  1084	static int iommu_iova_info_dump(struct seq_file *s, struct iommu_domain *domain)
  1085	{
  1086		struct iova_domain *iovad;
  1087		unsigned long long pfn;
  1088		unsigned long i_shift;
  1089		struct rb_node *node;
  1090		unsigned long flags;
  1091		size_t prot_size;
  1092	
> 1093		iovad = iommu_domain_to_iovad(domain);
  1094		if (!iovad)
  1095			return -ENOMEM;
  1096	
  1097		i_shift = iova_shift(iovad);
  1098	
  1099		/* Take the lock so that no other thread is manipulating the rbtree */
  1100		spin_lock_irqsave(&iovad->iova_rbtree_lock, flags);
  1101		assert_spin_locked(&iovad->iova_rbtree_lock);
  1102	
  1103		for (node = rb_first(&iovad->rbroot); node; node = rb_next(node)) {
  1104			struct iova *iova = rb_entry(node, struct iova, node);
  1105	
  1106			if (iova->pfn_hi <= iova->pfn_lo)
  1107				continue;
  1108	
  1109			for (pfn = iova->pfn_lo; pfn <= iova->pfn_hi; ) {
  1110				prot_size = domain->ops->dump_iova_prot(s, domain, pfn << i_shift);
  1111				pfn = ((pfn << i_shift) + prot_size) >> i_shift;
  1112			}
  1113		}
  1114	
  1115		spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags);
  1116		return 0;
  1117	}
  1118	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki