Re: [PATCH v17 1/5] iommu/arm-smmu: re-enable context caching in smmu reset operation

[kernel test robot <lkp@intel.com>]

Hi Bibek,

kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING on joro-iommu/next v6.12-rc7 next-20241113]
[cannot apply to arm64/for-next/core]
[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/Bibek-Kumar-Patro/iommu-arm-smmu-re-enable-context-caching-in-smmu-reset-operation/20241113-042646
base:   linus/master
patch link:    https://lore.kernel.org/r/20241112165454.2698269-2-quic_bibekkum%40quicinc.com
patch subject: [PATCH v17 1/5] iommu/arm-smmu: re-enable context caching in smmu reset operation
config: powerpc64-randconfig-r064-20241114 (https://download.01.org/0day-ci/archive/20241114/202411140748.6mcFdJdO-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 592c0fe55f6d9a811028b5f3507be91458ab2713)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241114/202411140748.6mcFdJdO-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202411140748.6mcFdJdO-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/iommu/arm/arm-smmu/arm-smmu-impl.c:10:
   In file included from drivers/iommu/arm/arm-smmu/arm-smmu.h:18:
   In file included from include/linux/io-64-nonatomic-hi-lo.h:5:
   In file included from include/linux/io.h:14:
   In file included from arch/powerpc/include/asm/io.h:24:
   In file included from include/linux/mm.h:2213:
   include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     518 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
>> drivers/iommu/arm/arm-smmu/arm-smmu-impl.c:113:6: warning: unused variable 'i' [-Wunused-variable]
     113 |         int i;
         |             ^
   2 warnings generated.


vim +/i +113 drivers/iommu/arm/arm-smmu/arm-smmu-impl.c

62b993a36e4c2d drivers/iommu/arm-smmu-impl.c Robin Murphy 2019-08-15  109  
759aaa10c76cba drivers/iommu/arm-smmu-impl.c Vivek Gautam 2019-09-20  110  int arm_mmu500_reset(struct arm_smmu_device *smmu)
62b993a36e4c2d drivers/iommu/arm-smmu-impl.c Robin Murphy 2019-08-15  111  {
62b993a36e4c2d drivers/iommu/arm-smmu-impl.c Robin Murphy 2019-08-15  112  	u32 reg, major;
62b993a36e4c2d drivers/iommu/arm-smmu-impl.c Robin Murphy 2019-08-15 @113  	int i;
62b993a36e4c2d drivers/iommu/arm-smmu-impl.c Robin Murphy 2019-08-15  114  	/*
62b993a36e4c2d drivers/iommu/arm-smmu-impl.c Robin Murphy 2019-08-15  115  	 * On MMU-500 r2p0 onwards we need to clear ACR.CACHE_LOCK before
62b993a36e4c2d drivers/iommu/arm-smmu-impl.c Robin Murphy 2019-08-15  116  	 * writes to the context bank ACTLRs will stick. And we just hope that
62b993a36e4c2d drivers/iommu/arm-smmu-impl.c Robin Murphy 2019-08-15  117  	 * Secure has also cleared SACR.CACHE_LOCK for this to take effect...
62b993a36e4c2d drivers/iommu/arm-smmu-impl.c Robin Murphy 2019-08-15  118  	 */
62b993a36e4c2d drivers/iommu/arm-smmu-impl.c Robin Murphy 2019-08-15  119  	reg = arm_smmu_gr0_read(smmu, ARM_SMMU_GR0_ID7);
fba6e960772b7b drivers/iommu/arm-smmu-impl.c Will Deacon  2020-01-10  120  	major = FIELD_GET(ARM_SMMU_ID7_MAJOR, reg);
62b993a36e4c2d drivers/iommu/arm-smmu-impl.c Robin Murphy 2019-08-15  121  	reg = arm_smmu_gr0_read(smmu, ARM_SMMU_GR0_sACR);
62b993a36e4c2d drivers/iommu/arm-smmu-impl.c Robin Murphy 2019-08-15  122  	if (major >= 2)
62b993a36e4c2d drivers/iommu/arm-smmu-impl.c Robin Murphy 2019-08-15  123  		reg &= ~ARM_MMU500_ACR_CACHE_LOCK;
62b993a36e4c2d drivers/iommu/arm-smmu-impl.c Robin Murphy 2019-08-15  124  	/*
62b993a36e4c2d drivers/iommu/arm-smmu-impl.c Robin Murphy 2019-08-15  125  	 * Allow unmatched Stream IDs to allocate bypass
62b993a36e4c2d drivers/iommu/arm-smmu-impl.c Robin Murphy 2019-08-15  126  	 * TLB entries for reduced latency.
62b993a36e4c2d drivers/iommu/arm-smmu-impl.c Robin Murphy 2019-08-15  127  	 */
62b993a36e4c2d drivers/iommu/arm-smmu-impl.c Robin Murphy 2019-08-15  128  	reg |= ARM_MMU500_ACR_SMTNMB_TLBEN | ARM_MMU500_ACR_S2CRB_TLBEN;
62b993a36e4c2d drivers/iommu/arm-smmu-impl.c Robin Murphy 2019-08-15  129  	arm_smmu_gr0_write(smmu, ARM_SMMU_GR0_sACR, reg);
62b993a36e4c2d drivers/iommu/arm-smmu-impl.c Robin Murphy 2019-08-15  130  

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