Re: [PATCH 8/9] accel/rocket: Add job submission IOCTL

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

Hi Tomeu,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 83a7eefedc9b56fe7bfeff13b6c7356688ffa670]

url:    https://github.com/intel-lab-lkp/linux/commits/Tomeu-Vizoso/iommu-rockchip-Add-compatible-for-rockchip-rk3588-iommu/20240612-215814
base:   83a7eefedc9b56fe7bfeff13b6c7356688ffa670
patch link:    https://lore.kernel.org/r/20240612-6-10-rocket-v1-8-060e48eea250%40tomeuvizoso.net
patch subject: [PATCH 8/9] accel/rocket: Add job submission IOCTL
config: hexagon-allmodconfig (https://download.01.org/0day-ci/archive/20240613/202406131640.WbBaRMbr-lkp@intel.com/config)
compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project 4403cdbaf01379de96f8d0d6ea4f51a085e37766)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240613/202406131640.WbBaRMbr-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/202406131640.WbBaRMbr-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/accel/rocket/rocket_job.c:6:
   In file included from include/drm/drm_file.h:39:
   In file included from include/drm/drm_prime.h:37:
   In file included from include/linux/scatterlist.h:8:
   In file included from include/linux/mm.h:2253:
   include/linux/vmstat.h:514:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     514 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   In file included from drivers/accel/rocket/rocket_job.c:6:
   In file included from include/drm/drm_file.h:39:
   In file included from include/drm/drm_prime.h:37:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/hexagon/include/asm/io.h:328:
   include/asm-generic/io.h:548:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     548 |         val = __raw_readb(PCI_IOBASE + addr);
         |                           ~~~~~~~~~~ ^
   include/asm-generic/io.h:561:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     561 |         val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
         |                                                         ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
      37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
         |                                                   ^
   In file included from drivers/accel/rocket/rocket_job.c:6:
   In file included from include/drm/drm_file.h:39:
   In file included from include/drm/drm_prime.h:37:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/hexagon/include/asm/io.h:328:
   include/asm-generic/io.h:574:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     574 |         val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
         |                                                         ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
      35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
         |                                                   ^
   In file included from drivers/accel/rocket/rocket_job.c:6:
   In file included from include/drm/drm_file.h:39:
   In file included from include/drm/drm_prime.h:37:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/hexagon/include/asm/io.h:328:
   include/asm-generic/io.h:585:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     585 |         __raw_writeb(value, PCI_IOBASE + addr);
         |                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:595:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     595 |         __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
         |                                                       ~~~~~~~~~~ ^
   include/asm-generic/io.h:605:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     605 |         __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
         |                                                       ~~~~~~~~~~ ^
>> drivers/accel/rocket/rocket_job.c:353:11: warning: variable 'status' set but not used [-Wunused-but-set-variable]
     353 |         uint32_t status, raw_status;
         |                  ^
>> drivers/accel/rocket/rocket_job.c:353:19: warning: variable 'raw_status' set but not used [-Wunused-but-set-variable]
     353 |         uint32_t status, raw_status;
         |                          ^
   drivers/accel/rocket/rocket_job.c:40:1: warning: unused function 'to_rocket_fence' [-Wunused-function]
      40 | to_rocket_fence(struct dma_fence *fence)
         | ^~~~~~~~~~~~~~~
   10 warnings generated.

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for IOMMU_IO_PGTABLE_LPAE
   Depends on [n]: IOMMU_SUPPORT [=y] && (ARM || ARM64 || COMPILE_TEST [=y]) && !GENERIC_ATOMIC64 [=y]
   Selected by [m]:
   - DRM_ACCEL_ROCKET [=m] && DRM [=m] && (ARM64 || COMPILE_TEST [=y]) && MMU [=y]


vim +/status +353 drivers/accel/rocket/rocket_job.c

   350	
   351	static void rocket_job_handle_irq(struct rocket_core *core)
   352	{
 > 353		uint32_t status, raw_status;
   354	
   355		pm_runtime_mark_last_busy(core->dev->dev);
   356	
   357		status = rocket_read(core, REG_PC_INTERRUPT_STATUS);
   358		raw_status = rocket_read(core, REG_PC_INTERRUPT_RAW_STATUS);
   359	
   360		rocket_write(core, REG_PC_OPERATION_ENABLE, 0x0);
   361		rocket_write(core, REG_PC_INTERRUPT_CLEAR, 0x1ffff);
   362	
   363		spin_lock(&core->job_lock);
   364	
   365		if (core->in_flight_job)
   366			rocket_job_handle_done(core, core->in_flight_job);
   367	
   368		spin_unlock(&core->job_lock);
   369	}
   370	

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