diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/crypto/nx/Makefile | 3 | ||||
| -rw-r--r-- | drivers/crypto/nx/nx-842-platform.c | 84 | ||||
| -rw-r--r-- | drivers/crypto/nx/nx-842-powernv.c | 17 | ||||
| -rw-r--r-- | drivers/crypto/nx/nx-842-pseries.c | 33 | ||||
| -rw-r--r-- | drivers/crypto/nx/nx-842.c | 130 | ||||
| -rw-r--r-- | drivers/crypto/nx/nx-842.h | 16 |
6 files changed, 148 insertions, 135 deletions
diff --git a/drivers/crypto/nx/Makefile b/drivers/crypto/nx/Makefile index 868b5e630794..e1684f5adb11 100644 --- a/drivers/crypto/nx/Makefile +++ b/drivers/crypto/nx/Makefile @@ -10,11 +10,12 @@ nx-crypto-objs := nx.o \ nx-sha256.o \ nx-sha512.o -obj-$(CONFIG_CRYPTO_DEV_NX_COMPRESS) += nx-compress.o +obj-$(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_CRYPTO) += nx-compress-crypto.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 nx-compress-crypto-objs := nx-842-crypto.o diff --git a/drivers/crypto/nx/nx-842-platform.c b/drivers/crypto/nx/nx-842-platform.c new file mode 100644 index 000000000000..664f13dd06ed --- /dev/null +++ b/drivers/crypto/nx/nx-842-platform.c @@ -0,0 +1,84 @@ + +#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 6a9fb8b2d05b..c388dba7da64 100644 --- a/drivers/crypto/nx/nx-842-powernv.c +++ b/drivers/crypto/nx/nx-842-powernv.c @@ -23,7 +23,6 @@ #include <asm/prom.h> #include <asm/icswx.h> -#define MODULE_NAME NX842_POWERNV_MODULE_NAME MODULE_LICENSE("GPL"); MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.org>"); MODULE_DESCRIPTION("842 H/W Compression driver for IBM PowerNV processors"); @@ -571,6 +570,7 @@ static struct nx842_constraints nx842_powernv_constraints = { }; static struct nx842_driver nx842_powernv_driver = { + .name = KBUILD_MODNAME, .owner = THIS_MODULE, .constraints = &nx842_powernv_constraints, .compress = nx842_powernv_compress, @@ -593,7 +593,7 @@ static __init int nx842_powernv_init(void) pr_info("loading\n"); - for_each_compatible_node(dn, NULL, NX842_POWERNV_COMPAT_NAME) + for_each_compatible_node(dn, NULL, "ibm,power-nx") nx842_powernv_probe(dn); if (!nx842_ct) { @@ -601,7 +601,16 @@ static __init int nx842_powernv_init(void) return -ENODEV; } - nx842_register_driver(&nx842_powernv_driver); + if (!nx842_platform_driver_set(&nx842_powernv_driver)) { + struct nx842_coproc *coproc, *n; + + list_for_each_entry_safe(coproc, n, &nx842_coprocs, list) { + list_del(&coproc->list); + kfree(coproc); + } + + return -EEXIST; + } pr_info("loaded\n"); @@ -613,7 +622,7 @@ static void __exit nx842_powernv_exit(void) { struct nx842_coproc *coproc, *n; - nx842_unregister_driver(&nx842_powernv_driver); + nx842_platform_driver_unset(&nx842_powernv_driver); 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 85837e96e9a3..17f191777139 100644 --- a/drivers/crypto/nx/nx-842-pseries.c +++ b/drivers/crypto/nx/nx-842-pseries.c @@ -26,7 +26,6 @@ #include "nx-842.h" #include "nx_csbcpb.h" /* struct nx_csbcpb */ -#define MODULE_NAME NX842_PSERIES_MODULE_NAME MODULE_LICENSE("GPL"); MODULE_AUTHOR("Robert Jennings <rcj@linux.vnet.ibm.com>"); MODULE_DESCRIPTION("842 H/W Compression driver for IBM Power processors"); @@ -965,6 +964,7 @@ static struct attribute_group nx842_attribute_group = { }; static struct nx842_driver nx842_pseries_driver = { + .name = KBUILD_MODNAME, .owner = THIS_MODULE, .constraints = &nx842_pseries_constraints, .compress = nx842_pseries_compress, @@ -1033,8 +1033,6 @@ static int __init nx842_probe(struct vio_dev *viodev, goto error; } - nx842_register_driver(&nx842_pseries_driver); - return 0; error_unlock: @@ -1066,18 +1064,16 @@ static int __exit nx842_remove(struct vio_dev *viodev) kfree(old_devdata->counters); kfree(old_devdata); - nx842_unregister_driver(&nx842_pseries_driver); - return 0; } static struct vio_device_id nx842_vio_driver_ids[] = { - {NX842_PSERIES_COMPAT_NAME "-v1", NX842_PSERIES_COMPAT_NAME}, + {"ibm,compression-v1", "ibm,compression"}, {"", ""}, }; static struct vio_driver nx842_vio_driver = { - .name = MODULE_NAME, + .name = KBUILD_MODNAME, .probe = nx842_probe, .remove = __exit_p(nx842_remove), .get_desired_dma = nx842_get_desired_dma, @@ -1087,10 +1083,15 @@ static struct vio_driver nx842_vio_driver = { static int __init nx842_init(void) { struct nx842_devdata *new_devdata; + int ret; + pr_info("Registering IBM Power 842 compression driver\n"); BUILD_BUG_ON(sizeof(struct nx842_workmem) > NX842_MEM_COMPRESS); + if (!of_find_compatible_node(NULL, NULL, "ibm,compression")) + return -ENODEV; + RCU_INIT_POINTER(devdata, NULL); new_devdata = kzalloc(sizeof(*new_devdata), GFP_KERNEL); if (!new_devdata) { @@ -1100,7 +1101,21 @@ static int __init nx842_init(void) new_devdata->status = UNAVAILABLE; RCU_INIT_POINTER(devdata, new_devdata); - return vio_register_driver(&nx842_vio_driver); + ret = vio_register_driver(&nx842_vio_driver); + if (ret) { + pr_err("Could not register VIO driver %d\n", ret); + + kfree(new_devdata); + return ret; + } + + if (!nx842_platform_driver_set(&nx842_pseries_driver)) { + vio_unregister_driver(&nx842_vio_driver); + kfree(new_devdata); + return -EEXIST; + } + + return 0; } module_init(nx842_init); @@ -1111,6 +1126,7 @@ static void __exit nx842_exit(void) unsigned long flags; pr_info("Exiting IBM Power 842 compression driver\n"); + nx842_platform_driver_unset(&nx842_pseries_driver); spin_lock_irqsave(&devdata_mutex, flags); old_devdata = rcu_dereference_check(devdata, lockdep_is_held(&devdata_mutex)); @@ -1120,7 +1136,6 @@ static void __exit nx842_exit(void) if (old_devdata && old_devdata->dev) dev_set_drvdata(old_devdata->dev, NULL); kfree(old_devdata); - nx842_unregister_driver(&nx842_pseries_driver); vio_unregister_driver(&nx842_vio_driver); } diff --git a/drivers/crypto/nx/nx-842.c b/drivers/crypto/nx/nx-842.c index bf2823ceaf4e..9f391d64c722 100644 --- a/drivers/crypto/nx/nx-842.c +++ b/drivers/crypto/nx/nx-842.c @@ -21,71 +21,10 @@ #include "nx-842.h" -#define MODULE_NAME "nx-compress" MODULE_LICENSE("GPL"); MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.org>"); MODULE_DESCRIPTION("842 H/W Compression driver for IBM Power processors"); -/* Only one driver is expected, based on the HW platform */ -static struct nx842_driver *nx842_driver; -static DEFINE_SPINLOCK(nx842_driver_lock); /* protects driver pointers */ - -void nx842_register_driver(struct nx842_driver *driver) -{ - spin_lock(&nx842_driver_lock); - - if (nx842_driver) { - pr_err("can't register driver %s, already using driver %s\n", - driver->owner->name, nx842_driver->owner->name); - } else { - pr_info("registering driver %s\n", driver->owner->name); - nx842_driver = driver; - } - - spin_unlock(&nx842_driver_lock); -} -EXPORT_SYMBOL_GPL(nx842_register_driver); - -void nx842_unregister_driver(struct nx842_driver *driver) -{ - spin_lock(&nx842_driver_lock); - - if (nx842_driver == driver) { - pr_info("unregistering driver %s\n", driver->owner->name); - nx842_driver = NULL; - } else if (nx842_driver) { - pr_err("can't unregister driver %s, using driver %s\n", - driver->owner->name, nx842_driver->owner->name); - } else { - pr_err("can't unregister driver %s, no driver in use\n", - driver->owner->name); - } - - spin_unlock(&nx842_driver_lock); -} -EXPORT_SYMBOL_GPL(nx842_unregister_driver); - -static struct nx842_driver *get_driver(void) -{ - struct nx842_driver *driver = NULL; - - spin_lock(&nx842_driver_lock); - - driver = nx842_driver; - - if (driver && !try_module_get(driver->owner)) - driver = NULL; - - spin_unlock(&nx842_driver_lock); - - return driver; -} - -static void put_driver(struct nx842_driver *driver) -{ - module_put(driver->owner); -} - /** * nx842_constraints * @@ -109,69 +48,38 @@ static void put_driver(struct nx842_driver *driver) */ int nx842_constraints(struct nx842_constraints *c) { - struct nx842_driver *driver = get_driver(); - int ret = 0; - - if (!driver) - return -ENODEV; - - BUG_ON(!c); - memcpy(c, driver->constraints, sizeof(*c)); - - put_driver(driver); - - return ret; + memcpy(c, nx842_platform_driver()->constraints, sizeof(*c)); + return 0; } EXPORT_SYMBOL_GPL(nx842_constraints); -int nx842_compress(const unsigned char *in, unsigned int in_len, - unsigned char *out, unsigned int *out_len, - void *wrkmem) +int nx842_compress(const unsigned char *in, unsigned int ilen, + unsigned char *out, unsigned int *olen, void *wmem) { - struct nx842_driver *driver = get_driver(); - int ret; - - if (!driver) - return -ENODEV; - - ret = driver->compress(in, in_len, out, out_len, wrkmem); - - put_driver(driver); - - return ret; + return nx842_platform_driver()->compress(in, ilen, out, olen, wmem); } EXPORT_SYMBOL_GPL(nx842_compress); -int nx842_decompress(const unsigned char *in, unsigned int in_len, - unsigned char *out, unsigned int *out_len, - void *wrkmem) +int nx842_decompress(const unsigned char *in, unsigned int ilen, + unsigned char *out, unsigned int *olen, void *wmem) { - struct nx842_driver *driver = get_driver(); - int ret; - - if (!driver) - return -ENODEV; - - ret = driver->decompress(in, in_len, out, out_len, wrkmem); - - put_driver(driver); - - return ret; + return nx842_platform_driver()->decompress(in, ilen, out, olen, wmem); } EXPORT_SYMBOL_GPL(nx842_decompress); static __init int nx842_init(void) { - pr_info("loading\n"); - - if (of_find_compatible_node(NULL, NULL, NX842_POWERNV_COMPAT_NAME)) - request_module_nowait(NX842_POWERNV_MODULE_NAME); - else if (of_find_compatible_node(NULL, NULL, NX842_PSERIES_COMPAT_NAME)) - request_module_nowait(NX842_PSERIES_MODULE_NAME); - else + request_module("nx-compress-powernv"); + request_module("nx-compress-pseries"); + + /* we prevent loading if there's no platform driver, and we get the + * module that set it so it won't unload, so we don't need to check + * if it's set in any of the above functions + */ + if (!nx842_platform_driver_get()) { pr_err("no nx842 driver found.\n"); - - pr_info("loaded\n"); + return -ENODEV; + } return 0; } @@ -179,6 +87,6 @@ module_init(nx842_init); static void __exit nx842_exit(void) { - pr_info("NX842 unloaded\n"); + nx842_platform_driver_put(); } module_exit(nx842_exit); diff --git a/drivers/crypto/nx/nx-842.h b/drivers/crypto/nx/nx-842.h index 84b15b7448bb..1730f4da1cf6 100644 --- a/drivers/crypto/nx/nx-842.h +++ b/drivers/crypto/nx/nx-842.h @@ -105,6 +105,7 @@ static inline unsigned long nx842_get_pa(void *addr) #define SET_FIELD(v, m, val) (((v) & ~(m)) | (((val) << MASK_LSH(m)) & (m))) struct nx842_driver { + char *name; struct module *owner; struct nx842_constraints *constraints; @@ -117,15 +118,10 @@ struct nx842_driver { void *wrkmem); }; -void nx842_register_driver(struct nx842_driver *driver); -void nx842_unregister_driver(struct nx842_driver *driver); - - -/* To allow the main nx-compress module to load platform module */ -#define NX842_POWERNV_MODULE_NAME "nx-compress-powernv" -#define NX842_POWERNV_COMPAT_NAME "ibm,power-nx" -#define NX842_PSERIES_MODULE_NAME "nx-compress-pseries" -#define NX842_PSERIES_COMPAT_NAME "ibm,compression" - +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); #endif /* __NX_842_H__ */ |