linux-kernel - Re: [PATCH v2 6/7] crypto: sun4i-ss: enabled stats via debugfs

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Date:   Fri, 25 Sep 2020 17:36:29 +1000
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Corentin Labbe <clabbe@...libre.com>
Cc:     arnd@...db.de, davem@...emloft.net, mripard@...nel.org,
        wens@...e.org, linux-arm-kernel@...ts.infradead.org,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH v2 6/7] crypto: sun4i-ss: enabled stats via debugfs

On Sun, Sep 20, 2020 at 06:37:17PM +0000, Corentin Labbe wrote:
>
> diff --git a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
> index f3bdf465b02e..2ec359eaa4cf 100644
> --- a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
> +++ b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
> @@ -34,6 +34,10 @@ static int noinline_for_stack sun4i_ss_opti_poll(struct skcipher_request *areq)
>  	struct sg_mapping_iter mi, mo;
>  	unsigned int oi, oo; /* offset for in and out */
>  	unsigned long flags;
> +#ifdef CONFIG_CRYPTO_DEV_SUN4I_SS_DEBUG
> +	struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
> +	struct sun4i_ss_alg_template *algt;
> +#endif
>  
>  	if (!areq->cryptlen)
>  		return 0;
> @@ -50,6 +54,12 @@ static int noinline_for_stack sun4i_ss_opti_poll(struct skcipher_request *areq)
>  		scatterwalk_map_and_copy(backup_iv, areq->src, areq->cryptlen - ivsize, ivsize, 0);
>  	}
>  
> +#ifdef CONFIG_CRYPTO_DEV_SUN4I_SS_DEBUG
> +	algt = container_of(alg, struct sun4i_ss_alg_template, alg.crypto);
> +	algt->stat_opti++;
> +	algt->stat_bytes += areq->cryptlen;
> +#endif

Please do

	if (IS_ENABLED(CONFIG_CRYPTO_DEV_SUN4I_SS_DEBUG)) {
		...
	}

instead so this always gets compiled.

> +#ifdef CONFIG_CRYPTO_DEV_SUN4I_SS_DEBUG
> +	/* Ignore error of debugfs */
> +	ss->dbgfs_dir = debugfs_create_dir("sun4i-ss", NULL);
> +	ss->dbgfs_stats = debugfs_create_file("stats", 0444, ss->dbgfs_dir, ss,
> +					      &sun4i_ss_debugfs_fops);
> +#endif

The calls too be done under an if statement.  Only the assignments
need to use the ifdef.

> diff --git a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss.h b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss.h
> index 163962f9e284..a98a2c05089b 100644
> --- a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss.h
> +++ b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss.h
> @@ -13,6 +13,7 @@
>  
>  #include <linux/clk.h>
>  #include <linux/crypto.h>
> +#include <linux/debugfs.h>

Please add this into the c files that actually use debugfs, and
not here.

>  #include <linux/io.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
> @@ -152,6 +153,10 @@ struct sun4i_ss_ctx {
>  #ifdef CONFIG_CRYPTO_DEV_SUN4I_SS_PRNG
>  	u32 seed[SS_SEED_LEN / BITS_PER_LONG];
>  #endif
> +#ifdef CONFIG_CRYPTO_DEV_SUN4I_SS_DEBUG
> +	struct dentry *dbgfs_dir;
> +	struct dentry *dbgfs_stats;
> +#endif

You just need to add forward declarations for struct dentry.

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt