Re: [PATCH 7/8] VMCI: dma dg: add support for DMA datagrams sends

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

Hi Jorgen,

I love your patch! Perhaps something to improve:

[auto build test WARNING on char-misc/char-misc-testing]
[also build test WARNING on linux/master linus/master v5.17-rc2 next-20220202]
[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/Jorgen-Hansen/VMCI-dma-dg-Add-support-for-DMA-datagrams/20220202-230034
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git 7ab004dbcbee38b8a70798835d3ffcd97a985a5e
config: i386-randconfig-a013-20220131 (https://download.01.org/0day-ci/archive/20220203/202202030803.BfgZqtfl-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 6b1e844b69f15bb7dffaf9365cd2b355d2eb7579)
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/303777a2a8daa11d529827395318bb698ddee57e
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Jorgen-Hansen/VMCI-dma-dg-Add-support-for-DMA-datagrams/20220202-230034
        git checkout 303777a2a8daa11d529827395318bb698ddee57e
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/misc/vmw_vmci/

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

All warnings (new ones prefixed by >>):

   drivers/misc/vmw_vmci/vmci_guest.c:103:14: warning: no previous prototype for function 'vmci_read_reg' [-Wmissing-prototypes]
   unsigned int vmci_read_reg(struct vmci_guest_device *dev, u32 reg)
                ^
   drivers/misc/vmw_vmci/vmci_guest.c:103:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   unsigned int vmci_read_reg(struct vmci_guest_device *dev, u32 reg)
   ^
   static 
   drivers/misc/vmw_vmci/vmci_guest.c:110:6: warning: no previous prototype for function 'vmci_write_reg' [-Wmissing-prototypes]
   void vmci_write_reg(struct vmci_guest_device *dev, u32 val, u32 reg)
        ^
   drivers/misc/vmw_vmci/vmci_guest.c:110:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void vmci_write_reg(struct vmci_guest_device *dev, u32 val, u32 reg)
   ^
   static 
>> drivers/misc/vmw_vmci/vmci_guest.c:118:5: warning: no previous prototype for function 'vmci_write_data' [-Wmissing-prototypes]
   int vmci_write_data(struct vmci_guest_device *dev, struct vmci_datagram *dg)
       ^
   drivers/misc/vmw_vmci/vmci_guest.c:118:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int vmci_write_data(struct vmci_guest_device *dev, struct vmci_datagram *dg)
   ^
   static 
   3 warnings generated.


vim +/vmci_write_data +118 drivers/misc/vmw_vmci/vmci_guest.c

   109	
 > 110	void vmci_write_reg(struct vmci_guest_device *dev, u32 val, u32 reg)
   111	{
   112		if (dev->mmio_base != NULL)
   113			writel(val, dev->mmio_base + reg);
   114		else
   115			iowrite32(val, dev->iobase + reg);
   116	}
   117	
 > 118	int vmci_write_data(struct vmci_guest_device *dev, struct vmci_datagram *dg)
   119	{
   120		int result;
   121	
   122		if (dev->mmio_base != NULL) {
   123			struct vmci_data_in_out_header *buffer_header = dev->tx_buffer;
   124			u8 *dg_out_buffer = (u8 *)(buffer_header + 1);
   125	
   126			if (VMCI_DG_SIZE(dg) > VMCI_MAX_DG_SIZE)
   127				return VMCI_ERROR_INVALID_ARGS;
   128	
   129			/*
   130			 * Initialize send buffer with outgoing datagram
   131			 * and set up header for inline data. Device will
   132			 * not access buffer asynchronously - only after
   133			 * the write to VMCI_DATA_OUT_LOW_ADDR.
   134			 */
   135			memcpy(dg_out_buffer, dg, VMCI_DG_SIZE(dg));
   136			buffer_header->opcode = 0;
   137			buffer_header->size = VMCI_DG_SIZE(dg);
   138			buffer_header->busy = 1;
   139	
   140			vmci_write_reg(dev, lower_32_bits(dev->tx_buffer_base),
   141				       VMCI_DATA_OUT_LOW_ADDR);
   142	
   143			/* Caller holds a spinlock, so cannot block. */
   144			spin_until_cond(buffer_header->busy == 0);
   145	
   146			result = vmci_read_reg(vmci_dev_g, VMCI_RESULT_LOW_ADDR);
   147			if (result == VMCI_SUCCESS)
   148				result = (int)buffer_header->result;
   149		} else {
   150			iowrite8_rep(dev->iobase + VMCI_DATA_OUT_ADDR,
   151				     dg, VMCI_DG_SIZE(dg));
   152			result = vmci_read_reg(vmci_dev_g, VMCI_RESULT_LOW_ADDR);
   153		}
   154	
   155		return result;
   156	}
   157	

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