crypto: nx - make platform drivers directly register with crypto

Remove the common 'platform' registration module, and move the crypto
compression driver registration into each of the pSeries and PowerNV
platform NX 842 drivers.  Change the nx-842.c code into simple common
functions that each platform driver uses to perform constraints-based
buffer changes, i.e. realigning and/or resizing buffers to match the
driver's hardware requirements.

The common 'platform' module was my mistake to create - since each
platform driver will only load/operate when running on its own
platform (i.e. a pSeries platform or a PowerNV platform), they can
directly register with the crypto subsystem, using the same alg and
driver name.  This removes unneeded complexity.

Signed-off-by: Dan Streetman <ddstreet@ieee.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/nx/Makefile

@@ -10,10 +10,8 @@ nx-crypto-objs := nx.o \
 		  nx-sha256.o \
 		  nx-sha512.o
 
-obj-$(CONFIG_CRYPTO_DEV_NX_COMPRESS) += nx-compress.o nx-compress-platform.o
-obj-$(CONFIG_CRYPTO_DEV_NX_COMPRESS_PSERIES) += nx-compress-pseries.o
-obj-$(CONFIG_CRYPTO_DEV_NX_COMPRESS_POWERNV) += nx-compress-powernv.o
+obj-$(CONFIG_CRYPTO_DEV_NX_COMPRESS_PSERIES) += nx-compress-pseries.o nx-compress.o
+obj-$(CONFIG_CRYPTO_DEV_NX_COMPRESS_POWERNV) += nx-compress-powernv.o nx-compress.o
 nx-compress-objs := nx-842.o
-nx-compress-platform-objs := nx-842-platform.o
 nx-compress-pseries-objs := nx-842-pseries.o
 nx-compress-powernv-objs := nx-842-powernv.o

drivers/crypto/nx/nx-842-powernv.c

@@ -26,6 +26,8 @@
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.org>");
 MODULE_DESCRIPTION("842 H/W Compression driver for IBM PowerNV processors");
+MODULE_ALIAS_CRYPTO("842");
+MODULE_ALIAS_CRYPTO("842-nx");
 
 #define WORKMEM_ALIGN	(CRB_ALIGN)
 #define CSB_WAIT_MAX	(5000) /* ms */
@@ -581,9 +583,29 @@ static struct nx842_driver nx842_powernv_driver = {
 	.decompress =	nx842_powernv_decompress,
 };
 
+static int nx842_powernv_crypto_init(struct crypto_tfm *tfm)
+{
+	return nx842_crypto_init(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 __init int nx842_powernv_init(void)
 {
 	struct device_node *dn;
+	int ret;
 
 	/* verify workmem size/align restrictions */
 	BUILD_BUG_ON(WORKMEM_ALIGN % CRB_ALIGN);
@@ -600,15 +622,16 @@ static __init int nx842_powernv_init(void)
 	if (!nx842_ct)
 		return -ENODEV;
 
-	if (!nx842_platform_driver_set(&nx842_powernv_driver)) {
+	ret = crypto_register_alg(&nx842_powernv_alg);
+	if (ret) {
 		struct nx842_coproc *coproc, *n;
 
 		list_for_each_entry_safe(coproc, n, &nx842_coprocs, list) {
 			list_del(&coproc->list);
 			kfree(coproc);
 		}
 
-		return -EEXIST;
+		return ret;
 	}
 
 	return 0;
@@ -619,7 +642,7 @@ static void __exit nx842_powernv_exit(void)
 {
 	struct nx842_coproc *coproc, *n;
 
-	nx842_platform_driver_unset(&nx842_powernv_driver);
+	crypto_unregister_alg(&nx842_powernv_alg);
 
 	list_for_each_entry_safe(coproc, n, &nx842_coprocs, list) {
 		list_del(&coproc->list);

drivers/crypto/nx/nx-842-pseries.c

@@ -29,6 +29,8 @@
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Robert Jennings <rcj@linux.vnet.ibm.com>");
 MODULE_DESCRIPTION("842 H/W Compression driver for IBM Power processors");
+MODULE_ALIAS_CRYPTO("842");
+MODULE_ALIAS_CRYPTO("842-nx");
 
 static struct nx842_constraints nx842_pseries_constraints = {
 	.alignment =	DDE_BUFFER_ALIGN,
@@ -957,6 +959,25 @@ static struct nx842_driver nx842_pseries_driver = {
 	.decompress =	nx842_pseries_decompress,
 };
 
+static int nx842_pseries_crypto_init(struct crypto_tfm *tfm)
+{
+	return nx842_crypto_init(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 int nx842_probe(struct vio_dev *viodev,
 		       const struct vio_device_id *id)
 {
@@ -1002,6 +1023,12 @@ static int nx842_probe(struct vio_dev *viodev,
 	if (ret)
 		goto error;
 
+	ret = crypto_register_alg(&nx842_pseries_alg);
+	if (ret) {
+		dev_err(&viodev->dev, "could not register comp alg: %d\n", ret);
+		goto error;
+	}
+
 	rcu_read_lock();
 	dev_set_drvdata(&viodev->dev, rcu_dereference(devdata));
 	rcu_read_unlock();
@@ -1031,6 +1058,8 @@ static int nx842_remove(struct vio_dev *viodev)
 	pr_info("Removing IBM Power 842 compression device\n");
 	sysfs_remove_group(&viodev->dev.kobj, &nx842_attribute_group);
 
+	crypto_unregister_alg(&nx842_pseries_alg);
+
 	spin_lock_irqsave(&devdata_mutex, flags);
 	old_devdata = rcu_dereference_check(devdata,
 			lockdep_is_held(&devdata_mutex));
@@ -1083,12 +1112,6 @@ static int __init nx842_pseries_init(void)
 		return ret;
 	}
 
-	if (!nx842_platform_driver_set(&nx842_pseries_driver)) {
-		vio_unregister_driver(&nx842_vio_driver);
-		kfree(new_devdata);
-		return -EEXIST;
-	}
-
 	return 0;
 }
 
@@ -1099,7 +1122,8 @@ static void __exit nx842_pseries_exit(void)
 	struct nx842_devdata *old_devdata;
 	unsigned long flags;
 
-	nx842_platform_driver_unset(&nx842_pseries_driver);
+	crypto_unregister_alg(&nx842_pseries_alg);
+
 	spin_lock_irqsave(&devdata_mutex, flags);
 	old_devdata = rcu_dereference_check(devdata,
 			lockdep_is_held(&devdata_mutex));