[opencloudos:next 6625/6628] drivers/crypto/ccp/hygon/psp-dev.c:472:5: warning: no previous prototype for '__vpsp_do_cmd_locked'

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

tree:   https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git next
head:   95dac159be359bc7ba42421426462f1a96f50ee9
commit: de722d17081287993748f63e8f34d06596eec824 [6625/6628] support tkm key isolation
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20240517/202405172006.ebTeyrfr-lkp@intel.com/config)
compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240517/202405172006.ebTeyrfr-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/202405172006.ebTeyrfr-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/crypto/ccp/hygon/psp-dev.c:49:10: warning: no previous prototype for 'atomic64_exchange' [-Wmissing-prototypes]
      49 | uint64_t atomic64_exchange(volatile uint64_t *dst, uint64_t val)
         |          ^~~~~~~~~~~~~~~~~
   drivers/crypto/ccp/hygon/psp-dev.c:63:5: warning: no previous prototype for 'psp_mutex_init' [-Wmissing-prototypes]
      63 | int psp_mutex_init(struct psp_mutex *mutex)
         |     ^~~~~~~~~~~~~~
>> drivers/crypto/ccp/hygon/psp-dev.c:472:5: warning: no previous prototype for '__vpsp_do_cmd_locked' [-Wmissing-prototypes]
     472 | int __vpsp_do_cmd_locked(uint32_t vid, int cmd, void *data, int *psp_ret)
         |     ^~~~~~~~~~~~~~~~~~~~
--
>> drivers/crypto/ccp/hygon/psp-dev.c:188: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
    * When the virtual machine executes the 'tkm' command,
   drivers/crypto/ccp/hygon/psp-dev.c:213: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
    * Upon qemu startup, this section checks whether
   drivers/crypto/ccp/hygon/psp-dev.c:241: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
    * Upon the virtual machine is shut down,


vim +/__vpsp_do_cmd_locked +472 drivers/crypto/ccp/hygon/psp-dev.c

   471	
 > 472	int __vpsp_do_cmd_locked(uint32_t vid, int cmd, void *data, int *psp_ret)
   473	{
   474		struct psp_device *psp = psp_master;
   475		struct sev_device *sev;
   476		phys_addr_t phys_addr;
   477		unsigned int phys_lsb, phys_msb;
   478		unsigned int reg, ret = 0;
   479	
   480		if (!psp || !psp->sev_data)
   481			return -ENODEV;
   482	
   483		if (*hygon_psp_hooks.psp_dead)
   484			return -EBUSY;
   485	
   486		sev = psp->sev_data;
   487	
   488		if (data && WARN_ON_ONCE(!virt_addr_valid(data)))
   489			return -EINVAL;
   490	
   491		/* Get the physical address of the command buffer */
   492		phys_addr = PUT_PSP_VID(__psp_pa(data), vid);
   493		phys_lsb = data ? lower_32_bits(phys_addr) : 0;
   494		phys_msb = data ? upper_32_bits(phys_addr) : 0;
   495	
   496		dev_dbg(sev->dev, "sev command id %#x buffer 0x%08x%08x timeout %us\n",
   497			cmd, phys_msb, phys_lsb, *hygon_psp_hooks.psp_timeout);
   498	
   499		print_hex_dump_debug("(in):  ", DUMP_PREFIX_OFFSET, 16, 2, data,
   500				     hygon_psp_hooks.sev_cmd_buffer_len(cmd), false);
   501	
   502		iowrite32(phys_lsb, sev->io_regs + sev->vdata->cmdbuff_addr_lo_reg);
   503		iowrite32(phys_msb, sev->io_regs + sev->vdata->cmdbuff_addr_hi_reg);
   504	
   505		sev->int_rcvd = 0;
   506	
   507		reg = FIELD_PREP(SEV_CMDRESP_CMD, cmd) | SEV_CMDRESP_IOC;
   508		iowrite32(reg, sev->io_regs + sev->vdata->cmdresp_reg);
   509	
   510		/* wait for command completion */
   511		ret = hygon_psp_hooks.sev_wait_cmd_ioc(sev, &reg, *hygon_psp_hooks.psp_timeout);
   512		if (ret) {
   513			if (psp_ret)
   514				*psp_ret = 0;
   515	
   516			dev_err(sev->dev, "sev command %#x timed out, disabling PSP\n", cmd);
   517			*hygon_psp_hooks.psp_dead = true;
   518	
   519			return ret;
   520		}
   521	
   522		*hygon_psp_hooks.psp_timeout = *hygon_psp_hooks.psp_cmd_timeout;
   523	
   524		if (psp_ret)
   525			*psp_ret = FIELD_GET(PSP_CMDRESP_STS, reg);
   526	
   527		if (FIELD_GET(PSP_CMDRESP_STS, reg)) {
   528			dev_dbg(sev->dev, "sev command %#x failed (%#010lx)\n",
   529				cmd, FIELD_GET(PSP_CMDRESP_STS, reg));
   530			ret = -EIO;
   531		}
   532	
   533		print_hex_dump_debug("(out): ", DUMP_PREFIX_OFFSET, 16, 2, data,
   534				     hygon_psp_hooks.sev_cmd_buffer_len(cmd), false);
   535	
   536		return ret;
   537	}
   538	

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