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s390/zcryt: Handle AP configuration changes

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Detect external AP bus configuration changes and request
an AP device rescan.

Signed-off-by: Holger Dengler <hd@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Holger Dengler
2012-09-10 21:34:26 +02:00
committed by Martin Schwidefsky
parent 745e967a49
commit dabecb2933
6 changed files with 201 additions and 9 deletions
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114
drivers/s390/crypto/zcrypt_api.c
View File

@@ -38,7 +38,10 @@
#include <linux/atomic.h>
#include <asm/uaccess.h>
#include <linux/hw_random.h>
#include <linux/debugfs.h>
#include <asm/debug.h>
#include "zcrypt_debug.h"
#include "zcrypt_api.h"
/*
@@ -53,6 +56,10 @@ static DEFINE_SPINLOCK(zcrypt_device_lock);
static LIST_HEAD(zcrypt_device_list);
static int zcrypt_device_count = 0;
static atomic_t zcrypt_open_count = ATOMIC_INIT(0);
static atomic_t zcrypt_rescan_count = ATOMIC_INIT(0);
atomic_t zcrypt_rescan_req = ATOMIC_INIT(0);
EXPORT_SYMBOL(zcrypt_rescan_req);
static int zcrypt_rng_device_add(void);
static void zcrypt_rng_device_remove(void);
@@ -60,6 +67,10 @@ static void zcrypt_rng_device_remove(void);
static DEFINE_SPINLOCK(zcrypt_ops_list_lock);
static LIST_HEAD(zcrypt_ops_list);
static debug_info_t *zcrypt_dbf_common;
static debug_info_t *zcrypt_dbf_devices;
static struct dentry *debugfs_root;
/*
* Device attributes common for all crypto devices.
*/
@@ -89,6 +100,8 @@ static ssize_t zcrypt_online_store(struct device *dev,
if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
return -EINVAL;
zdev->online = online;
ZCRYPT_DBF_DEV(DBF_INFO, zdev, "dev%04xo%dman", zdev->ap_dev->qid,
zdev->online);
if (!online)
ap_flush_queue(zdev->ap_dev);
return count;
@@ -106,6 +119,24 @@ static struct attribute_group zcrypt_device_attr_group = {
.attrs = zcrypt_device_attrs,
};
/**
* Process a rescan of the transport layer.
*
* Returns 1, if the rescan has been processed, otherwise 0.
*/
static inline int zcrypt_process_rescan(void)
{
if (atomic_read(&zcrypt_rescan_req)) {
atomic_set(&zcrypt_rescan_req, 0);
atomic_inc(&zcrypt_rescan_count);
ap_bus_force_rescan();
ZCRYPT_DBF_COMMON(DBF_INFO, "rescan%07d",
atomic_inc_return(&zcrypt_rescan_count));
return 1;
}
return 0;
}
/**
* __zcrypt_increase_preference(): Increase preference of a crypto device.
* @zdev: Pointer the crypto device
@@ -194,6 +225,7 @@ struct zcrypt_device *zcrypt_device_alloc(size_t max_response_size)
zdev->reply.length = max_response_size;
spin_lock_init(&zdev->lock);
INIT_LIST_HEAD(&zdev->list);
zdev->dbf_area = zcrypt_dbf_devices;
return zdev;
out_free:
@@ -229,6 +261,8 @@ int zcrypt_device_register(struct zcrypt_device *zdev)
kref_init(&zdev->refcount);
spin_lock_bh(&zcrypt_device_lock);
zdev->online = 1; /* New devices are online by default. */
ZCRYPT_DBF_DEV(DBF_INFO, zdev, "dev%04xo%dreg", zdev->ap_dev->qid,
zdev->online);
list_add_tail(&zdev->list, &zcrypt_device_list);
__zcrypt_increase_preference(zdev);
zcrypt_device_count++;
@@ -707,6 +741,11 @@ static long zcrypt_unlocked_ioctl(struct file *filp, unsigned int cmd,
do {
rc = zcrypt_rsa_modexpo(&mex);
} while (rc == -EAGAIN);
/* on failure: retry once again after a requested rescan */
if ((rc == -ENODEV) && (zcrypt_process_rescan()))
do {
rc = zcrypt_rsa_modexpo(&mex);
} while (rc == -EAGAIN);
if (rc)
return rc;
return put_user(mex.outputdatalength, &umex->outputdatalength);
@@ -719,6 +758,11 @@ static long zcrypt_unlocked_ioctl(struct file *filp, unsigned int cmd,
do {
rc = zcrypt_rsa_crt(&crt);
} while (rc == -EAGAIN);
/* on failure: retry once again after a requested rescan */
if ((rc == -ENODEV) && (zcrypt_process_rescan()))
do {
rc = zcrypt_rsa_crt(&crt);
} while (rc == -EAGAIN);
if (rc)
return rc;
return put_user(crt.outputdatalength, &ucrt->outputdatalength);
@@ -731,6 +775,11 @@ static long zcrypt_unlocked_ioctl(struct file *filp, unsigned int cmd,
do {
rc = zcrypt_send_cprb(&xcRB);
} while (rc == -EAGAIN);
/* on failure: retry once again after a requested rescan */
if ((rc == -ENODEV) && (zcrypt_process_rescan()))
do {
rc = zcrypt_send_cprb(&xcRB);
} while (rc == -EAGAIN);
if (copy_to_user(uxcRB, &xcRB, sizeof(xcRB)))
return -EFAULT;
return rc;
@@ -837,10 +886,15 @@ static long trans_modexpo32(struct file *filp, unsigned int cmd,
do {
rc = zcrypt_rsa_modexpo(&mex64);
} while (rc == -EAGAIN);
if (!rc)
rc = put_user(mex64.outputdatalength,
&umex32->outputdatalength);
return rc;
/* on failure: retry once again after a requested rescan */
if ((rc == -ENODEV) && (zcrypt_process_rescan()))
do {
rc = zcrypt_rsa_modexpo(&mex64);
} while (rc == -EAGAIN);
if (rc)
return rc;
return put_user(mex64.outputdatalength,
&umex32->outputdatalength);
}
struct compat_ica_rsa_modexpo_crt {
@@ -877,10 +931,15 @@ static long trans_modexpo_crt32(struct file *filp, unsigned int cmd,
do {
rc = zcrypt_rsa_crt(&crt64);
} while (rc == -EAGAIN);
if (!rc)
rc = put_user(crt64.outputdatalength,
&ucrt32->outputdatalength);
return rc;
/* on failure: retry once again after a requested rescan */
if ((rc == -ENODEV) && (zcrypt_process_rescan()))
do {
rc = zcrypt_rsa_crt(&crt64);
} while (rc == -EAGAIN);
if (rc)
return rc;
return put_user(crt64.outputdatalength,
&ucrt32->outputdatalength);
}
struct compat_ica_xcRB {
@@ -936,6 +995,11 @@ static long trans_xcRB32(struct file *filp, unsigned int cmd,
do {
rc = zcrypt_send_cprb(&xcRB64);
} while (rc == -EAGAIN);
/* on failure: retry once again after a requested rescan */
if ((rc == -ENODEV) && (zcrypt_process_rescan()))
do {
rc = zcrypt_send_cprb(&xcRB64);
} while (rc == -EAGAIN);
xcRB32.reply_control_blk_length = xcRB64.reply_control_blk_length;
xcRB32.reply_data_length = xcRB64.reply_data_length;
xcRB32.status = xcRB64.status;
@@ -1193,6 +1257,9 @@ static int zcrypt_rng_data_read(struct hwrng *rng, u32 *data)
*/
if (zcrypt_rng_buffer_index == 0) {
rc = zcrypt_rng((char *) zcrypt_rng_buffer);
/* on failure: retry once again after a requested rescan */
if ((rc == -ENODEV) && (zcrypt_process_rescan()))
rc = zcrypt_rng((char *) zcrypt_rng_buffer);
if (rc < 0)
return -EIO;
zcrypt_rng_buffer_index = rc / sizeof *data;
@@ -1245,6 +1312,30 @@ static void zcrypt_rng_device_remove(void)
mutex_unlock(&zcrypt_rng_mutex);
}
int __init zcrypt_debug_init(void)
{
debugfs_root = debugfs_create_dir("zcrypt", NULL);
zcrypt_dbf_common = debug_register("zcrypt_common", 1, 1, 16);
debug_register_view(zcrypt_dbf_common, &debug_hex_ascii_view);
debug_set_level(zcrypt_dbf_common, DBF_ERR);
zcrypt_dbf_devices = debug_register("zcrypt_devices", 1, 1, 16);
debug_register_view(zcrypt_dbf_devices, &debug_hex_ascii_view);
debug_set_level(zcrypt_dbf_devices, DBF_ERR);
return 0;
}
void zcrypt_debug_exit(void)
{
debugfs_remove(debugfs_root);
if (zcrypt_dbf_common)
debug_unregister(zcrypt_dbf_common);
if (zcrypt_dbf_devices)
debug_unregister(zcrypt_dbf_devices);
}
/**
* zcrypt_api_init(): Module initialization.
*
@@ -1254,6 +1345,12 @@ int __init zcrypt_api_init(void)
{
int rc;
rc = zcrypt_debug_init();
if (rc)
goto out;
atomic_set(&zcrypt_rescan_req, 0);
/* Register the request sprayer. */
rc = misc_register(&zcrypt_misc_device);
if (rc < 0)
@@ -1283,6 +1380,7 @@ void zcrypt_api_exit(void)
{
remove_proc_entry("driver/z90crypt", NULL);
misc_deregister(&zcrypt_misc_device);
zcrypt_debug_exit();
}
module_init(zcrypt_api_init);