Subject: [RFC PATCH 09/21] crypto: nx - Migrate to scomp API

From: Ard Biesheuvel <[email-masked]>
Date: Tue, 18 Jul 2023 14:58:35 +0200

The only remaining user of 842 compression has been migrated to the
acomp compression API, and so the NX hardware driver has to follow suit,
given that no users of the obsolete 'comp' API remain, and it is going
to be removed.

So migrate the NX driver code to scomp. These will be wrapped and
exposed as acomp implementation via the crypto subsystem's
acomp-to-scomp adaptation layer.

Signed-off-by: Ard Biesheuvel <[email-masked]>
---
 drivers/crypto/nx/nx-842.c            | 34 ++++++++++++--------
 drivers/crypto/nx/nx-842.h            | 14 ++++----
 drivers/crypto/nx/nx-common-powernv.c | 30 ++++++++---------
 drivers/crypto/nx/nx-common-pseries.c | 32 +++++++++---------
 4 files changed, 57 insertions(+), 53 deletions(-)

diff --git a/drivers/crypto/nx/nx-842.c b/drivers/crypto/nx/nx-842.c
index 2ab90ec10e61ebe8..331b9cdf85e27044 100644
--- a/drivers/crypto/nx/nx-842.c
+++ b/drivers/crypto/nx/nx-842.c
@@ -101,9 +101,14 @@ static int update_param(struct nx842_crypto_param *p,
 	return 0;
 }
 
-int nx842_crypto_init(struct crypto_tfm *tfm, struct nx842_driver *driver)
+void *nx842_crypto_alloc_ctx(struct crypto_scomp *tfm,
+			     struct nx842_driver *driver)
 {
-	struct nx842_crypto_ctx *ctx = crypto_tfm_ctx(tfm);
+	struct nx842_crypto_ctx *ctx;
+
+	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return ERR_PTR(-ENOMEM);
 
 	spin_lock_init(&ctx->lock);
 	ctx->driver = driver;
@@ -114,22 +119,23 @@ int nx842_crypto_init(struct crypto_tfm *tfm, struct nx842_driver *driver)
 		kfree(ctx->wmem);
 		free_page((unsigned long)ctx->sbounce);
 		free_page((unsigned long)ctx->dbounce);
-		return -ENOMEM;
+		kfree(ctx);
+		return ERR_PTR(-ENOMEM);
 	}
 
-	return 0;
+	return ctx;
 }
-EXPORT_SYMBOL_GPL(nx842_crypto_init);
+EXPORT_SYMBOL_GPL(nx842_crypto_alloc_ctx);
 
-void nx842_crypto_exit(struct crypto_tfm *tfm)
+void nx842_crypto_free_ctx(struct crypto_scomp *tfm, void *p)
 {
-	struct nx842_crypto_ctx *ctx = crypto_tfm_ctx(tfm);
+	struct nx842_crypto_ctx *ctx = p;
 
 	kfree(ctx->wmem);
 	free_page((unsigned long)ctx->sbounce);
 	free_page((unsigned long)ctx->dbounce);
 }
-EXPORT_SYMBOL_GPL(nx842_crypto_exit);
+EXPORT_SYMBOL_GPL(nx842_crypto_free_ctx);
 
 static void check_constraints(struct nx842_constraints *c)
 {
@@ -246,11 +252,11 @@ static int compress(struct nx842_crypto_ctx *ctx,
 	return update_param(p, slen, dskip + dlen);
 }
 
-int nx842_crypto_compress(struct crypto_tfm *tfm,
+int nx842_crypto_compress(struct crypto_scomp *tfm,
 			  const u8 *src, unsigned int slen,
-			  u8 *dst, unsigned int *dlen)
+			  u8 *dst, unsigned int *dlen, void *pctx)
 {
-	struct nx842_crypto_ctx *ctx = crypto_tfm_ctx(tfm);
+	struct nx842_crypto_ctx *ctx = pctx;
 	struct nx842_crypto_header *hdr = &ctx->header;
 	struct nx842_crypto_param p;
 	struct nx842_constraints c = *ctx->driver->constraints;
@@ -429,11 +435,11 @@ static int decompress(struct nx842_crypto_ctx *ctx,
 	return update_param(p, slen + padding, dlen);
 }
 
-int nx842_crypto_decompress(struct crypto_tfm *tfm,
+int nx842_crypto_decompress(struct crypto_scomp *tfm,
 			    const u8 *src, unsigned int slen,
-			    u8 *dst, unsigned int *dlen)
+			    u8 *dst, unsigned int *dlen, void *pctx)
 {
-	struct nx842_crypto_ctx *ctx = crypto_tfm_ctx(tfm);
+	struct nx842_crypto_ctx *ctx = pctx;
 	struct nx842_crypto_header *hdr;
 	struct nx842_crypto_param p;
 	struct nx842_constraints c = *ctx->driver->constraints;
diff --git a/drivers/crypto/nx/nx-842.h b/drivers/crypto/nx/nx-842.h
index 7590bfb24d79bf42..de9dc8df62ed9dcb 100644
--- a/drivers/crypto/nx/nx-842.h
+++ b/drivers/crypto/nx/nx-842.h
@@ -12,6 +12,7 @@
 #include <linux/io.h>
 #include <linux/mm.h>
 #include <linux/ratelimit.h>
+#include <crypto/internal/scompress.h>
 
 /* Restrictions on Data Descriptor List (DDL) and Entry (DDE) buffers
  *
@@ -177,13 +178,14 @@ struct nx842_crypto_ctx {
 	struct nx842_driver *driver;
 };
 
-int nx842_crypto_init(struct crypto_tfm *tfm, struct nx842_driver *driver);
-void nx842_crypto_exit(struct crypto_tfm *tfm);
-int nx842_crypto_compress(struct crypto_tfm *tfm,
+void *nx842_crypto_alloc_ctx(struct crypto_scomp *tfm,
+			     struct nx842_driver *driver);
+void nx842_crypto_free_ctx(struct crypto_scomp *tfm, void *ctx);
+int nx842_crypto_compress(struct crypto_scomp *tfm,
 			  const u8 *src, unsigned int slen,
-			  u8 *dst, unsigned int *dlen);
-int nx842_crypto_decompress(struct crypto_tfm *tfm,
+			  u8 *dst, unsigned int *dlen, void *ctx);
+int nx842_crypto_decompress(struct crypto_scomp *tfm,
 			    const u8 *src, unsigned int slen,
-			    u8 *dst, unsigned int *dlen);
+			    u8 *dst, unsigned int *dlen, void *ctx);
 
 #endif /* __NX_842_H__ */
diff --git a/drivers/crypto/nx/nx-common-powernv.c b/drivers/crypto/nx/nx-common-powernv.c
index 8c859872c1839eca..80023686f3e21b72 100644
--- a/drivers/crypto/nx/nx-common-powernv.c
+++ b/drivers/crypto/nx/nx-common-powernv.c
@@ -1031,23 +1031,21 @@ static struct nx842_driver nx842_powernv_driver = {
 	.decompress =	nx842_powernv_decompress,
 };
 
-static int nx842_powernv_crypto_init(struct crypto_tfm *tfm)
+static void *nx842_powernv_crypto_alloc_ctx(struct crypto_scomp *tfm)
 {
-	return nx842_crypto_init(tfm, &nx842_powernv_driver);
+	return nx842_crypto_alloc_ctx(tfm, &nx842_powernv_driver);
 }
 
-static struct crypto_alg nx842_powernv_alg = {
-	.cra_name		= "842",
-	.cra_driver_name	= "842-nx",
-	.cra_priority		= 300,
-	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
-	.cra_ctxsize		= sizeof(struct nx842_crypto_ctx),
-	.cra_module		= THIS_MODULE,
-	.cra_init		= nx842_powernv_crypto_init,
-	.cra_exit		= nx842_crypto_exit,
-	.cra_u			= { .compress = {
-	.coa_compress		= nx842_crypto_compress,
-	.coa_decompress		= nx842_crypto_decompress } }
+static struct scomp_alg nx842_powernv_alg = {
+	.base.cra_name		= "842",
+	.base.cra_driver_name	= "842-nx",
+	.base.cra_priority	= 300,
+	.base.cra_module	= THIS_MODULE,
+
+	.alloc_ctx		= nx842_powernv_crypto_alloc_ctx,
+	.free_ctx		= nx842_crypto_free_ctx,
+	.compress		= nx842_crypto_compress,
+	.decompress		= nx842_crypto_decompress,
 };
 
 static __init int nx_compress_powernv_init(void)
@@ -1107,7 +1105,7 @@ static __init int nx_compress_powernv_init(void)
 		nx842_powernv_exec = nx842_exec_vas;
 	}
 
-	ret = crypto_register_alg(&nx842_powernv_alg);
+	ret = crypto_register_scomp(&nx842_powernv_alg);
 	if (ret) {
 		nx_delete_coprocs();
 		return ret;
@@ -1128,7 +1126,7 @@ static void __exit nx_compress_powernv_exit(void)
 	if (!nx842_ct)
 		vas_unregister_api_powernv();
 
-	crypto_unregister_alg(&nx842_powernv_alg);
+	crypto_unregister_scomp(&nx842_powernv_alg);
 
 	nx_delete_coprocs();
 }
diff --git a/drivers/crypto/nx/nx-common-pseries.c b/drivers/crypto/nx/nx-common-pseries.c
index 35f2d0d8507ed774..6232901adc495ed3 100644
--- a/drivers/crypto/nx/nx-common-pseries.c
+++ b/drivers/crypto/nx/nx-common-pseries.c
@@ -1008,23 +1008,21 @@ static struct nx842_driver nx842_pseries_driver = {
 	.decompress =	nx842_pseries_decompress,
 };
 
-static int nx842_pseries_crypto_init(struct crypto_tfm *tfm)
+static void *nx842_pseries_crypto_alloc_ctx(struct crypto_scomp *tfm)
 {
-	return nx842_crypto_init(tfm, &nx842_pseries_driver);
+	return nx842_crypto_alloc_ctx(tfm, &nx842_pseries_driver);
 }
 
-static struct crypto_alg nx842_pseries_alg = {
-	.cra_name		= "842",
-	.cra_driver_name	= "842-nx",
-	.cra_priority		= 300,
-	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
-	.cra_ctxsize		= sizeof(struct nx842_crypto_ctx),
-	.cra_module		= THIS_MODULE,
-	.cra_init		= nx842_pseries_crypto_init,
-	.cra_exit		= nx842_crypto_exit,
-	.cra_u			= { .compress = {
-	.coa_compress		= nx842_crypto_compress,
-	.coa_decompress		= nx842_crypto_decompress } }
+static struct scomp_alg nx842_pseries_alg = {
+	.base.cra_name		= "842",
+	.base.cra_driver_name	= "842-nx",
+	.base.cra_priority	= 300,
+	.base.cra_module	= THIS_MODULE,
+
+	.alloc_ctx		= nx842_pseries_crypto_alloc_ctx,
+	.free_ctx		= nx842_crypto_free_ctx,
+	.compress		= nx842_crypto_compress,
+	.decompress		= nx842_crypto_decompress,
 };
 
 static int nx842_probe(struct vio_dev *viodev,
@@ -1072,7 +1070,7 @@ static int nx842_probe(struct vio_dev *viodev,
 	if (ret)
 		goto error;
 
-	ret = crypto_register_alg(&nx842_pseries_alg);
+	ret = crypto_register_scomp(&nx842_pseries_alg);
 	if (ret) {
 		dev_err(&viodev->dev, "could not register comp alg: %d\n", ret);
 		goto error;
@@ -1120,7 +1118,7 @@ static void nx842_remove(struct vio_dev *viodev)
 	if (caps_feat)
 		sysfs_remove_group(&viodev->dev.kobj, &nxcop_caps_attr_group);
 
-	crypto_unregister_alg(&nx842_pseries_alg);
+	crypto_unregister_scomp(&nx842_pseries_alg);
 
 	spin_lock_irqsave(&devdata_mutex, flags);
 	old_devdata = rcu_dereference_check(devdata,
@@ -1255,7 +1253,7 @@ static void __exit nx842_pseries_exit(void)
 
 	vas_unregister_api_pseries();
 
-	crypto_unregister_alg(&nx842_pseries_alg);
+	crypto_unregister_scomp(&nx842_pseries_alg);
 
 	spin_lock_irqsave(&devdata_mutex, flags);
 	old_devdata = rcu_dereference_check(devdata,
-- 
2.39.2