Re: [PATCH v3 14/14] crypto: sun8i-ce: Add support for the TRNG

[kernel test robot]

Hi Corentin,

I love your patch! Perhaps something to improve:

[auto build test WARNING on sunxi/sunxi/for-next]
[also build test WARNING on cryptodev/master crypto/master v5.8-rc2]
[cannot apply to next-20200621]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use  as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Corentin-Labbe/crypto-allwinner-add-xRNG-and-hashes/20200622-033401
base:   https://git.kernel.org/pub/scm/linux/kernel/git/sunxi/linux.git sunxi/for-next
config: x86_64-allyesconfig (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project ef455a55bcf2cfea04a99c361b182ad18b7f03f1)
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
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

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

All warnings (new ones prefixed by >>, old ones prefixed by <<):

>> drivers/crypto/allwinner/sun8i-ce/sun8i-ce-trng.c:22:5: warning: no previous prototype for function 'sun8i_ce_trng_read' [-Wmissing-prototypes]
int sun8i_ce_trng_read(struct hwrng *rng, void *data, size_t max, bool wait)
^
drivers/crypto/allwinner/sun8i-ce/sun8i-ce-trng.c:22:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int sun8i_ce_trng_read(struct hwrng *rng, void *data, size_t max, bool wait)
^
static
>> drivers/crypto/allwinner/sun8i-ce/sun8i-ce-trng.c:105:24: warning: result of comparison of constant 255 with expression of type 'const char' is always false [-Wtautological-constant-out-of-range-compare]
if (ce->variant->trng == CE_ID_NOTSUPP) {
~~~~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~
drivers/crypto/allwinner/sun8i-ce/sun8i-ce-trng.c:121:24: warning: result of comparison of constant 255 with expression of type 'const char' is always false [-Wtautological-constant-out-of-range-compare]
if (ce->variant->trng == CE_ID_NOTSUPP)
~~~~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~
3 warnings generated.

vim +/sun8i_ce_trng_read +22 drivers/crypto/allwinner/sun8i-ce/sun8i-ce-trng.c

  > 22	int sun8i_ce_trng_read(struct hwrng *rng, void *data, size_t max, bool wait)
    23	{
    24		struct sun8i_ce_dev *ce;
    25		dma_addr_t dma_dst;
    26		int err = 0;
    27		int flow = 3;
    28		unsigned int todo;
    29		struct sun8i_ce_flow *chan;
    30		struct ce_task *cet;
    31		u32 common;
    32		void *d;
    33	
    34		ce = container_of(rng, struct sun8i_ce_dev, trng);
    35	
    36		/* round the data length to a multiple of 32*/
    37		todo = max + 32;
    38		todo -= todo % 32;
    39	
    40		d = kzalloc(todo, GFP_KERNEL | GFP_DMA);
    41		if (!d)
    42			return -ENOMEM;
    43	
    44	#ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
    45		ce->hwrng_stat_req++;
    46		ce->hwrng_stat_bytes += todo;
    47	#endif
    48	
    49		dma_dst = dma_map_single(ce->dev, d, todo, DMA_FROM_DEVICE);
    50		if (dma_mapping_error(ce->dev, dma_dst)) {
    51			dev_err(ce->dev, "Cannot DMA MAP DST\n");
    52			err = -EFAULT;
    53			goto err_dst;
    54		}
    55	
    56		err = pm_runtime_get_sync(ce->dev);
    57		if (err < 0)
    58			goto err_pm;
    59	
    60		mutex_lock(&ce->rnglock);
    61		chan = &ce->chanlist[flow];
    62	
    63		cet = &chan->tl[0];
    64		memset(cet, 0, sizeof(struct ce_task));
    65	
    66		cet->t_id = cpu_to_le32(flow);
    67		common = ce->variant->trng | CE_COMM_INT;
    68		cet->t_common_ctl = cpu_to_le32(common);
    69	
    70		/* recent CE (H6) need length in bytes, in word otherwise */
    71		if (ce->variant->trng_t_dlen_in_bytes)
    72			cet->t_dlen = cpu_to_le32(todo);
    73		else
    74			cet->t_dlen = cpu_to_le32(todo / 4);
    75	
    76		cet->t_sym_ctl = 0;
    77		cet->t_asym_ctl = 0;
    78	
    79		cet->t_dst[0].addr = cpu_to_le32(dma_dst);
    80		cet->t_dst[0].len = cpu_to_le32(todo / 4);
    81		ce->chanlist[flow].timeout = todo;
    82	
    83		err = sun8i_ce_run_task(ce, 3, "TRNG");
    84		mutex_unlock(&ce->rnglock);
    85	
    86		pm_runtime_put(ce->dev);
    87	
    88	err_pm:
    89		dma_unmap_single(ce->dev, dma_dst, todo, DMA_FROM_DEVICE);
    90	
    91		if (!err) {
    92			memcpy(data, d, max);
    93			err = max;
    94		}
    95		memzero_explicit(d, todo);
    96	err_dst:
    97		kfree(d);
    98		return err;
    99	}
   100	
   101	int sun8i_ce_hwrng_register(struct sun8i_ce_dev *ce)
   102	{
   103		int ret;
   104	
 > 105		if (ce->variant->trng == CE_ID_NOTSUPP) {
   106			dev_info(ce->dev, "TRNG not supported\n");
   107			return 0;
   108		}
   109		ce->trng.name = "sun8i Crypto Engine TRNG";
   110		ce->trng.read = sun8i_ce_trng_read;
   111		ce->trng.quality = 1000;
   112	
   113		ret = hwrng_register(&ce->trng);
   114		if (ret)
   115			dev_err(ce->dev, "Fail to register the TRNG\n");
   116		return ret;
   117	}
   118	

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