linux-kernel - Re: [PATCH v3 1/3] crypto: introduce acomp_is_sleepable to expose if comp drivers might sleep

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Date: Tue, 20 Feb 2024 12:07:17 +1300
From: Barry Song <21cnbao@...il.com>
To: Herbert Xu <herbert@...dor.apana.org.au>
Cc: akpm@...ux-foundation.org, davem@...emloft.net, hannes@...xchg.org, 
	linux-crypto@...r.kernel.org, linux-mm@...ck.org, nphamcs@...il.com, 
	yosryahmed@...gle.com, zhouchengming@...edance.com, chriscli@...gle.com, 
	chrisl@...nel.org, ddstreet@...e.org, linux-kernel@...r.kernel.org, 
	sjenning@...hat.com, vitaly.wool@...sulko.com, 
	Barry Song <v-songbaohua@...o.com>
Subject: Re: [PATCH v3 1/3] crypto: introduce acomp_is_sleepable to expose if
 comp drivers might sleep

On Mon, Feb 19, 2024 at 5:25 PM Herbert Xu <herbert@...dor.apana.org.au> wrote:
>
> On Sat, Feb 17, 2024 at 05:51:00PM +1300, Barry Song wrote:
> .
> > diff --git a/crypto/acompress.c b/crypto/acompress.c
> > index 1c682810a484..fa15df394a4c 100644
> > --- a/crypto/acompress.c
> > +++ b/crypto/acompress.c
> > @@ -152,6 +152,14 @@ struct crypto_acomp *crypto_alloc_acomp_node(const char *alg_name, u32 type,
> >  }
> >  EXPORT_SYMBOL_GPL(crypto_alloc_acomp_node);
> >
> > +bool acomp_is_sleepable(struct crypto_acomp *acomp)
> > +{
> > +     struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
> > +
> > +     return tfm->__crt_alg->cra_type == &crypto_acomp_type;
> > +}
> > +EXPORT_SYMBOL_GPL(acomp_is_sleepable);
>
> Just because something is of acomp_type it doesn't mean that it's
> async.  You should be testing the algorithm flags.

I guess I got your point, drivers using acomp framework might actually
be SYNC if they don't set CRYPTO_ALG_ASYNC.

>
> So introduce a helper crypto_acomp_get_flags (see the similar
> helper crypto_skcipher_get_flags) and test it against CRYPTO_ALG_ASYNC.

On the other hand, some drivers which are actually ASYNC, are lacking
CRYPTO_ALG_ASYNC for example:

diff --git a/drivers/crypto/hisilicon/zip/zip_crypto.c
b/drivers/crypto/hisilicon/zip/zip_crypto.c
index c650c741a18d..94e2d66b04b6 100644
--- a/drivers/crypto/hisilicon/zip/zip_crypto.c
+++ b/drivers/crypto/hisilicon/zip/zip_crypto.c
@@ -591,6 +591,7 @@ static struct acomp_alg hisi_zip_acomp_deflate = {
        .base                   = {
                .cra_name               = "deflate",
                .cra_driver_name        = "hisi-deflate-acomp",
+               .cra_flags              = CRYPTO_ALG_ASYNC,
                .cra_module             = THIS_MODULE,
                .cra_priority           = HZIP_ALG_PRIORITY,
                .cra_ctxsize            = sizeof(struct hisi_zip_ctx),
diff --git a/drivers/crypto/intel/iaa/iaa_crypto_main.c
b/drivers/crypto/intel/iaa/iaa_crypto_main.c
index dfd3baf0a8d8..91adf9d76a2e 100644
--- a/drivers/crypto/intel/iaa/iaa_crypto_main.c
+++ b/drivers/crypto/intel/iaa/iaa_crypto_main.c
@@ -1916,6 +1916,7 @@ static struct acomp_alg iaa_acomp_fixed_deflate = {
        .base                   = {
                .cra_name               = "deflate",
                .cra_driver_name        = "deflate-iaa",
+               .cra_flags              = CRYPTO_ALG_ASYNC,
                .cra_ctxsize            = sizeof(struct iaa_compression_ctx),
                .cra_module             = THIS_MODULE,
                .cra_priority           = IAA_ALG_PRIORITY,
diff --git a/include/crypto/acompress.h b/include/crypto/acompress.h
index 574cffc90730..5b10bd075a07 100644
--- a/include/crypto/acompress.h
+++ b/include/crypto/acompress.h
@@ -160,6 +160,11 @@ static inline void acomp_request_set_tfm(struct
acomp_req *req,
        req->base.tfm = crypto_acomp_tfm(tfm);
 }

+static inline u32 crypto_acomp_get_flags(struct crypto_acomp *tfm)
+{
+       return crypto_tfm_get_flags(crypto_acomp_tfm(tfm));
+}
+
 static inline struct crypto_acomp *crypto_acomp_reqtfm(struct acomp_req *req)
 {
        return __crypto_acomp_tfm(req->base.tfm);


Herbert, Is the above code what you would prefer?

>
> Cheers,
> --
> 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

Thanks
Barry