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Date: Mon, 22 Jun 2020 08:27:11 +0800
From: kernel test robot <lkp@...el.com>
To: Corentin Labbe <clabbe@...libre.com>, davem@...emloft.net,
herbert@...dor.apana.org.au, mripard@...nel.org, wens@...e.org
Cc: kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
linux-arm-kernel@...ts.infradead.org, linux-crypto@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com,
Corentin Labbe <clabbe@...libre.com>
Subject: Re: [PATCH v3 14/14] crypto: sun8i-ce: Add support for the TRNG
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@...el.com>
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
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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