From: Dan Streetman <ddstreet@ieee.org>
To: Herbert Xu <herbert@gondor.apana.org.au>,
"David S. Miller" <davem@davemloft.net>
Cc: linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org,
Dan Streetman <ddstreet@ieee.org>
Subject: [PATCH 8/8] crypto: nx - make platform drivers directly register with crypto
Date: Wed, 22 Jul 2015 14:26:38 -0400 [thread overview]
Message-ID: <1437589598-23917-9-git-send-email-ddstreet@ieee.org> (raw)
In-Reply-To: <1437589598-23917-1-git-send-email-ddstreet@ieee.org>
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>
---
drivers/crypto/nx/Makefile | 6 +--
drivers/crypto/nx/nx-842-platform.c | 84 -----------------------------
drivers/crypto/nx/nx-842-powernv.c | 29 ++++++++--
drivers/crypto/nx/nx-842-pseries.c | 38 ++++++++++---
drivers/crypto/nx/nx-842.c | 105 +++++++-----------------------------
drivers/crypto/nx/nx-842.h | 43 ++++++++++++---
6 files changed, 114 insertions(+), 191 deletions(-)
delete mode 100644 drivers/crypto/nx/nx-842-platform.c
diff --git a/drivers/crypto/nx/Makefile b/drivers/crypto/nx/Makefile
index ffcc86c..b727821 100644
--- a/drivers/crypto/nx/Makefile
+++ b/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
diff --git a/drivers/crypto/nx/nx-842-platform.c b/drivers/crypto/nx/nx-842-platform.c
deleted file mode 100644
index 664f13d..0000000
--- a/drivers/crypto/nx/nx-842-platform.c
+++ /dev/null
@@ -1,84 +0,0 @@
-
-#include "nx-842.h"
-
-/* this is needed, separate from the main nx-842.c driver, because that main
- * driver loads the platform drivers during its init(), and it expects one
- * (or none) of the platform drivers to set this pointer to its driver.
- * That means this pointer can't be in the main nx-842 driver, because it
- * wouldn't be accessible until after the main driver loaded, which wouldn't
- * be possible as it's waiting for the platform driver to load. So place it
- * here.
- */
-static struct nx842_driver *driver;
-static DEFINE_SPINLOCK(driver_lock);
-
-struct nx842_driver *nx842_platform_driver(void)
-{
- return driver;
-}
-EXPORT_SYMBOL_GPL(nx842_platform_driver);
-
-bool nx842_platform_driver_set(struct nx842_driver *_driver)
-{
- bool ret = false;
-
- spin_lock(&driver_lock);
-
- if (!driver) {
- driver = _driver;
- ret = true;
- } else
- WARN(1, "can't set platform driver, already set to %s\n",
- driver->name);
-
- spin_unlock(&driver_lock);
- return ret;
-}
-EXPORT_SYMBOL_GPL(nx842_platform_driver_set);
-
-/* only call this from the platform driver exit function */
-void nx842_platform_driver_unset(struct nx842_driver *_driver)
-{
- spin_lock(&driver_lock);
-
- if (driver == _driver)
- driver = NULL;
- else if (driver)
- WARN(1, "can't unset platform driver %s, currently set to %s\n",
- _driver->name, driver->name);
- else
- WARN(1, "can't unset platform driver, already unset\n");
-
- spin_unlock(&driver_lock);
-}
-EXPORT_SYMBOL_GPL(nx842_platform_driver_unset);
-
-bool nx842_platform_driver_get(void)
-{
- bool ret = false;
-
- spin_lock(&driver_lock);
-
- if (driver)
- ret = try_module_get(driver->owner);
-
- spin_unlock(&driver_lock);
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(nx842_platform_driver_get);
-
-void nx842_platform_driver_put(void)
-{
- spin_lock(&driver_lock);
-
- if (driver)
- module_put(driver->owner);
-
- spin_unlock(&driver_lock);
-}
-EXPORT_SYMBOL_GPL(nx842_platform_driver_put);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.org>");
-MODULE_DESCRIPTION("842 H/W Compression platform driver");
diff --git a/drivers/crypto/nx/nx-842-powernv.c b/drivers/crypto/nx/nx-842-powernv.c
index 7e47456..684ce51 100644
--- a/drivers/crypto/nx/nx-842-powernv.c
+++ b/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);
@@ -600,7 +622,8 @@ 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) {
@@ -608,7 +631,7 @@ static __init int nx842_powernv_init(void)
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);
diff --git a/drivers/crypto/nx/nx-842-pseries.c b/drivers/crypto/nx/nx-842-pseries.c
index 4b7bd8f..b6a26907 100644
--- a/drivers/crypto/nx/nx-842-pseries.c
+++ b/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));
diff --git a/drivers/crypto/nx/nx-842.c b/drivers/crypto/nx/nx-842.c
index 4472e20..046c1c4 100644
--- a/drivers/crypto/nx/nx-842.c
+++ b/drivers/crypto/nx/nx-842.c
@@ -57,12 +57,8 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/crypto.h>
#include <linux/vmalloc.h>
#include <linux/sw842.h>
-#include <linux/ratelimit.h>
#include <linux/spinlock.h>
#include "nx-842.h"
@@ -74,7 +70,6 @@
* buffer, and passed directly to the hardware to decompress.
*/
#define NX842_CRYPTO_MAGIC (0xf842)
-#define NX842_CRYPTO_GROUP_MAX (0x20)
#define NX842_CRYPTO_HEADER_SIZE(g) \
(sizeof(struct nx842_crypto_header) + \
sizeof(struct nx842_crypto_header_group) * (g))
@@ -90,19 +85,6 @@
#define COMP_BUSY_TIMEOUT (250) /* ms */
#define DECOMP_BUSY_TIMEOUT (50) /* ms */
-struct nx842_crypto_header_group {
- __be16 padding; /* unused bytes at start of group */
- __be32 compressed_length; /* compressed bytes in group */
- __be32 uncompressed_length; /* bytes after decompression */
-} __packed;
-
-struct nx842_crypto_header {
- __be16 magic; /* NX842_CRYPTO_MAGIC */
- __be16 ignore; /* decompressed end bytes to ignore */
- u8 groups; /* total groups in this header */
- struct nx842_crypto_header_group group[];
-} __packed;
-
struct nx842_crypto_param {
u8 *in;
unsigned int iremain;
@@ -128,22 +110,13 @@ static int update_param(struct nx842_crypto_param *p,
return 0;
}
-struct nx842_crypto_ctx {
- spinlock_t lock;
-
- u8 *wmem;
- u8 *sbounce, *dbounce;
-
- struct nx842_crypto_header header;
- struct nx842_crypto_header_group group[NX842_CRYPTO_GROUP_MAX];
-};
-
-static int nx842_crypto_init(struct crypto_tfm *tfm)
+int nx842_crypto_init(struct crypto_tfm *tfm, struct nx842_driver *driver)
{
struct nx842_crypto_ctx *ctx = crypto_tfm_ctx(tfm);
spin_lock_init(&ctx->lock);
- ctx->wmem = kmalloc(nx842_workmem_size(), GFP_KERNEL);
+ ctx->driver = driver;
+ ctx->wmem = kmalloc(driver->workmem_size, GFP_KERNEL);
ctx->sbounce = (u8 *)__get_free_pages(GFP_KERNEL, BOUNCE_BUFFER_ORDER);
ctx->dbounce = (u8 *)__get_free_pages(GFP_KERNEL, BOUNCE_BUFFER_ORDER);
if (!ctx->wmem || !ctx->sbounce || !ctx->dbounce) {
@@ -155,8 +128,9 @@ static int nx842_crypto_init(struct crypto_tfm *tfm)
return 0;
}
+EXPORT_SYMBOL_GPL(nx842_crypto_init);
-static void nx842_crypto_exit(struct crypto_tfm *tfm)
+void nx842_crypto_exit(struct crypto_tfm *tfm)
{
struct nx842_crypto_ctx *ctx = crypto_tfm_ctx(tfm);
@@ -164,6 +138,7 @@ static void nx842_crypto_exit(struct crypto_tfm *tfm)
free_page((unsigned long)ctx->sbounce);
free_page((unsigned long)ctx->dbounce);
}
+EXPORT_SYMBOL_GPL(nx842_crypto_exit);
static void check_constraints(struct nx842_constraints *c)
{
@@ -250,9 +225,7 @@ nospc:
timeout = ktime_add_ms(ktime_get(), COMP_BUSY_TIMEOUT);
do {
dlen = tmplen; /* reset dlen, if we're retrying */
- ret = nx842_platform_driver()->compress(src, slen,
- dst, &dlen,
- ctx->wmem);
+ ret = ctx->driver->compress(src, slen, dst, &dlen, ctx->wmem);
/* possibly we should reduce the slen here, instead of
* retrying with the dbounce buffer?
*/
@@ -282,14 +255,14 @@ nospc:
return update_param(p, slen, dskip + dlen);
}
-static int nx842_crypto_compress(struct crypto_tfm *tfm,
- const u8 *src, unsigned int slen,
- u8 *dst, unsigned int *dlen)
+int nx842_crypto_compress(struct crypto_tfm *tfm,
+ const u8 *src, unsigned int slen,
+ u8 *dst, unsigned int *dlen)
{
struct nx842_crypto_ctx *ctx = crypto_tfm_ctx(tfm);
struct nx842_crypto_header *hdr = &ctx->header;
struct nx842_crypto_param p;
- struct nx842_constraints c = *nx842_platform_driver()->constraints;
+ struct nx842_constraints c = *ctx->driver->constraints;
unsigned int groups, hdrsize, h;
int ret, n;
bool add_header;
@@ -366,6 +339,7 @@ unlock:
spin_unlock_bh(&ctx->lock);
return ret;
}
+EXPORT_SYMBOL_GPL(nx842_crypto_compress);
static int decompress(struct nx842_crypto_ctx *ctx,
struct nx842_crypto_param *p,
@@ -429,9 +403,7 @@ static int decompress(struct nx842_crypto_ctx *ctx,
timeout = ktime_add_ms(ktime_get(), DECOMP_BUSY_TIMEOUT);
do {
dlen = tmplen; /* reset dlen, if we're retrying */
- ret = nx842_platform_driver()->decompress(src, slen,
- dst, &dlen,
- ctx->wmem);
+ ret = ctx->driver->decompress(src, slen, dst, &dlen, ctx->wmem);
} while (ret == -EBUSY && ktime_before(ktime_get(), timeout));
if (ret) {
usesw:
@@ -467,14 +439,14 @@ usesw:
return update_param(p, slen + padding, dlen);
}
-static int nx842_crypto_decompress(struct crypto_tfm *tfm,
- const u8 *src, unsigned int slen,
- u8 *dst, unsigned int *dlen)
+int nx842_crypto_decompress(struct crypto_tfm *tfm,
+ const u8 *src, unsigned int slen,
+ u8 *dst, unsigned int *dlen)
{
struct nx842_crypto_ctx *ctx = crypto_tfm_ctx(tfm);
struct nx842_crypto_header *hdr;
struct nx842_crypto_param p;
- struct nx842_constraints c = *nx842_platform_driver()->constraints;
+ struct nx842_constraints c = *ctx->driver->constraints;
int n, ret, hdr_len;
u16 ignore = 0;
@@ -552,49 +524,8 @@ unlock:
return ret;
}
-
-static struct crypto_alg 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_crypto_init,
- .cra_exit = nx842_crypto_exit,
- .cra_u = { .compress = {
- .coa_compress = nx842_crypto_compress,
- .coa_decompress = nx842_crypto_decompress } }
-};
-
-static int __init nx842_crypto_mod_init(void)
-{
- request_module("nx-compress-powernv");
- request_module("nx-compress-pseries");
-
- /* we prevent loading/registering if there's no platform driver,
- * and we get the platform module that set it so it won't unload,
- * so we don't need to check if it's set in any of our functions
- */
- if (!nx842_platform_driver_get()) {
- pr_err("no nx842 platform driver found.\n");
- return -ENODEV;
- }
-
- return crypto_register_alg(&alg);
-}
-module_init(nx842_crypto_mod_init);
-
-static void __exit nx842_crypto_mod_exit(void)
-{
- crypto_unregister_alg(&alg);
-
- nx842_platform_driver_put();
-}
-module_exit(nx842_crypto_mod_exit);
+EXPORT_SYMBOL_GPL(nx842_crypto_decompress);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("IBM PowerPC Nest (NX) 842 Hardware Compression Driver");
-MODULE_ALIAS_CRYPTO("842");
-MODULE_ALIAS_CRYPTO("842-nx");
MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.org>");
diff --git a/drivers/crypto/nx/nx-842.h b/drivers/crypto/nx/nx-842.h
index c7dd0a4..a4eee3b 100644
--- a/drivers/crypto/nx/nx-842.h
+++ b/drivers/crypto/nx/nx-842.h
@@ -3,8 +3,9 @@
#define __NX_842_H__
#include <linux/kernel.h>
+#include <linux/init.h>
#include <linux/module.h>
-#include <linux/sw842.h>
+#include <linux/crypto.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <linux/io.h>
@@ -145,10 +146,40 @@ struct nx842_driver {
void *wrkmem);
};
-struct nx842_driver *nx842_platform_driver(void);
-bool nx842_platform_driver_set(struct nx842_driver *driver);
-void nx842_platform_driver_unset(struct nx842_driver *driver);
-bool nx842_platform_driver_get(void);
-void nx842_platform_driver_put(void);
+struct nx842_crypto_header_group {
+ __be16 padding; /* unused bytes at start of group */
+ __be32 compressed_length; /* compressed bytes in group */
+ __be32 uncompressed_length; /* bytes after decompression */
+} __packed;
+
+struct nx842_crypto_header {
+ __be16 magic; /* NX842_CRYPTO_MAGIC */
+ __be16 ignore; /* decompressed end bytes to ignore */
+ u8 groups; /* total groups in this header */
+ struct nx842_crypto_header_group group[];
+} __packed;
+
+#define NX842_CRYPTO_GROUP_MAX (0x20)
+
+struct nx842_crypto_ctx {
+ spinlock_t lock;
+
+ u8 *wmem;
+ u8 *sbounce, *dbounce;
+
+ struct nx842_crypto_header header;
+ struct nx842_crypto_header_group group[NX842_CRYPTO_GROUP_MAX];
+
+ 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,
+ const u8 *src, unsigned int slen,
+ u8 *dst, unsigned int *dlen);
+int nx842_crypto_decompress(struct crypto_tfm *tfm,
+ const u8 *src, unsigned int slen,
+ u8 *dst, unsigned int *dlen);
#endif /* __NX_842_H__ */
--
2.1.0
next prev parent reply other threads:[~2015-07-22 18:27 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-22 18:26 [PATCH 0/8] remove 'platform' shared NX driver Dan Streetman
2015-07-22 18:26 ` [PATCH 1/8] crypto: nx - remove __init/__exit from VIO functions Dan Streetman
2015-07-22 18:26 ` [PATCH 2/8] crypto: nx - remove pSeries NX 'status' field Dan Streetman
2015-07-22 18:26 ` [PATCH 3/8] crypto: nx - move kzalloc() out of spinlock Dan Streetman
2015-07-22 18:26 ` [PATCH 4/8] crypto: nx - don't register pSeries driver if ENODEV Dan Streetman
2015-07-22 18:26 ` [PATCH 5/8] crypto: nx - use common code for both NX decompress success cases Dan Streetman
2015-07-22 18:26 ` [PATCH 6/8] crypto: nx - merge nx-compress and nx-compress-crypto Dan Streetman
2015-07-22 18:26 ` [PATCH 7/8] crypto: nx - rename nx-842-crypto.c to nx-842.c Dan Streetman
2015-07-22 18:26 ` Dan Streetman [this message]
2015-07-23 10:20 ` [PATCH 0/8] remove 'platform' shared NX driver Herbert Xu
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