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![Heiko Carstens](/assets/img/avatar_default.png)
Many comments above functions start with a kernel doc indicator, but the comments are not using kernel doc style. Get rid of the warnings by simply removing the indicator. E.g.: drivers/s390/crypto/zcrypt_msgtype6.c:111: warning: This comment starts with '/**', but isn't a kernel-doc comment. Reviewed-by: Harald Freudenberger <freude@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
425 lines
11 KiB
C
425 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright IBM Corp. 2001, 2018
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* Author(s): Robert Burroughs
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* Eric Rossman (edrossma@us.ibm.com)
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*
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* Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
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* Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
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* Ralph Wuerthner <rwuerthn@de.ibm.com>
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* MSGTYPE restruct: Holger Dengler <hd@linux.vnet.ibm.com>
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/atomic.h>
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#include <linux/uaccess.h>
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#include <linux/mod_devicetable.h>
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#include "ap_bus.h"
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#include "zcrypt_api.h"
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#include "zcrypt_error.h"
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#include "zcrypt_msgtype6.h"
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#include "zcrypt_cex2c.h"
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#include "zcrypt_cca_key.h"
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#include "zcrypt_ccamisc.h"
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#define CEX2C_MIN_MOD_SIZE 16 /* 128 bits */
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#define CEX2C_MAX_MOD_SIZE 256 /* 2048 bits */
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#define CEX3C_MIN_MOD_SIZE 16 /* 128 bits */
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#define CEX3C_MAX_MOD_SIZE 512 /* 4096 bits */
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#define CEX2C_MAX_XCRB_MESSAGE_SIZE (12*1024)
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#define CEX2C_CLEANUP_TIME (15*HZ)
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MODULE_AUTHOR("IBM Corporation");
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MODULE_DESCRIPTION("CEX2C/CEX3C Cryptographic Coprocessor device driver, " \
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"Copyright IBM Corp. 2001, 2018");
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MODULE_LICENSE("GPL");
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static struct ap_device_id zcrypt_cex2c_card_ids[] = {
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{ .dev_type = AP_DEVICE_TYPE_CEX2C,
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.match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE },
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{ .dev_type = AP_DEVICE_TYPE_CEX3C,
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.match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE },
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{ /* end of list */ },
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};
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MODULE_DEVICE_TABLE(ap, zcrypt_cex2c_card_ids);
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static struct ap_device_id zcrypt_cex2c_queue_ids[] = {
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{ .dev_type = AP_DEVICE_TYPE_CEX2C,
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.match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
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{ .dev_type = AP_DEVICE_TYPE_CEX3C,
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.match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
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{ /* end of list */ },
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};
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MODULE_DEVICE_TABLE(ap, zcrypt_cex2c_queue_ids);
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/*
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* CCA card additional device attributes
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*/
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static ssize_t cca_serialnr_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct zcrypt_card *zc = dev_get_drvdata(dev);
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struct cca_info ci;
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struct ap_card *ac = to_ap_card(dev);
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memset(&ci, 0, sizeof(ci));
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if (ap_domain_index >= 0)
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cca_get_info(ac->id, ap_domain_index, &ci, zc->online);
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return scnprintf(buf, PAGE_SIZE, "%s\n", ci.serial);
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}
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static struct device_attribute dev_attr_cca_serialnr =
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__ATTR(serialnr, 0444, cca_serialnr_show, NULL);
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static struct attribute *cca_card_attrs[] = {
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&dev_attr_cca_serialnr.attr,
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NULL,
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};
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static const struct attribute_group cca_card_attr_grp = {
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.attrs = cca_card_attrs,
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};
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/*
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* CCA queue additional device attributes
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*/
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static ssize_t cca_mkvps_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct zcrypt_queue *zq = dev_get_drvdata(dev);
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int n = 0;
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struct cca_info ci;
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static const char * const cao_state[] = { "invalid", "valid" };
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static const char * const new_state[] = { "empty", "partial", "full" };
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memset(&ci, 0, sizeof(ci));
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cca_get_info(AP_QID_CARD(zq->queue->qid),
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AP_QID_QUEUE(zq->queue->qid),
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&ci, zq->online);
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if (ci.new_aes_mk_state >= '1' && ci.new_aes_mk_state <= '3')
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n = scnprintf(buf, PAGE_SIZE, "AES NEW: %s 0x%016llx\n",
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new_state[ci.new_aes_mk_state - '1'],
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ci.new_aes_mkvp);
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else
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n = scnprintf(buf, PAGE_SIZE, "AES NEW: - -\n");
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if (ci.cur_aes_mk_state >= '1' && ci.cur_aes_mk_state <= '2')
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n += scnprintf(buf + n, PAGE_SIZE - n,
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"AES CUR: %s 0x%016llx\n",
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cao_state[ci.cur_aes_mk_state - '1'],
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ci.cur_aes_mkvp);
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else
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n += scnprintf(buf + n, PAGE_SIZE - n, "AES CUR: - -\n");
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if (ci.old_aes_mk_state >= '1' && ci.old_aes_mk_state <= '2')
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n += scnprintf(buf + n, PAGE_SIZE - n,
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"AES OLD: %s 0x%016llx\n",
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cao_state[ci.old_aes_mk_state - '1'],
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ci.old_aes_mkvp);
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else
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n += scnprintf(buf + n, PAGE_SIZE - n, "AES OLD: - -\n");
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if (ci.new_apka_mk_state >= '1' && ci.new_apka_mk_state <= '3')
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n += scnprintf(buf + n, PAGE_SIZE - n,
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"APKA NEW: %s 0x%016llx\n",
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new_state[ci.new_apka_mk_state - '1'],
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ci.new_apka_mkvp);
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else
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n += scnprintf(buf + n, PAGE_SIZE - n, "APKA NEW: - -\n");
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if (ci.cur_apka_mk_state >= '1' && ci.cur_apka_mk_state <= '2')
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n += scnprintf(buf + n, PAGE_SIZE - n,
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"APKA CUR: %s 0x%016llx\n",
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cao_state[ci.cur_apka_mk_state - '1'],
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ci.cur_apka_mkvp);
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else
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n += scnprintf(buf + n, PAGE_SIZE - n, "APKA CUR: - -\n");
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if (ci.old_apka_mk_state >= '1' && ci.old_apka_mk_state <= '2')
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n += scnprintf(buf + n, PAGE_SIZE - n,
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"APKA OLD: %s 0x%016llx\n",
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cao_state[ci.old_apka_mk_state - '1'],
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ci.old_apka_mkvp);
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else
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n += scnprintf(buf + n, PAGE_SIZE - n, "APKA OLD: - -\n");
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return n;
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}
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static struct device_attribute dev_attr_cca_mkvps =
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__ATTR(mkvps, 0444, cca_mkvps_show, NULL);
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static struct attribute *cca_queue_attrs[] = {
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&dev_attr_cca_mkvps.attr,
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NULL,
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};
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static const struct attribute_group cca_queue_attr_grp = {
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.attrs = cca_queue_attrs,
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};
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/*
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* Large random number detection function. Its sends a message to a CEX2C/CEX3C
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* card to find out if large random numbers are supported.
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* @ap_dev: pointer to the AP device.
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*
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* Returns 1 if large random numbers are supported, 0 if not and < 0 on error.
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*/
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static int zcrypt_cex2c_rng_supported(struct ap_queue *aq)
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{
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struct ap_message ap_msg;
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unsigned long long psmid;
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unsigned int domain;
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struct {
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struct type86_hdr hdr;
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struct type86_fmt2_ext fmt2;
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struct CPRBX cprbx;
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} __packed *reply;
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struct {
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struct type6_hdr hdr;
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struct CPRBX cprbx;
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char function_code[2];
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short int rule_length;
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char rule[8];
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short int verb_length;
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short int key_length;
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} __packed *msg;
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int rc, i;
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ap_init_message(&ap_msg);
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ap_msg.msg = (void *) get_zeroed_page(GFP_KERNEL);
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if (!ap_msg.msg)
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return -ENOMEM;
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rng_type6CPRB_msgX(&ap_msg, 4, &domain);
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msg = ap_msg.msg;
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msg->cprbx.domain = AP_QID_QUEUE(aq->qid);
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rc = ap_send(aq->qid, 0x0102030405060708ULL, ap_msg.msg, ap_msg.len);
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if (rc)
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goto out_free;
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/* Wait for the test message to complete. */
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for (i = 0; i < 2 * HZ; i++) {
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msleep(1000 / HZ);
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rc = ap_recv(aq->qid, &psmid, ap_msg.msg, 4096);
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if (rc == 0 && psmid == 0x0102030405060708ULL)
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break;
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}
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if (i >= 2 * HZ) {
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/* Got no answer. */
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rc = -ENODEV;
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goto out_free;
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}
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reply = ap_msg.msg;
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if (reply->cprbx.ccp_rtcode == 0 && reply->cprbx.ccp_rscode == 0)
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rc = 1;
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else
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rc = 0;
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out_free:
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free_page((unsigned long) ap_msg.msg);
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return rc;
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}
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/*
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* Probe function for CEX2C/CEX3C card devices. It always accepts the
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* AP device since the bus_match already checked the hardware type.
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* @ap_dev: pointer to the AP card device.
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*/
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static int zcrypt_cex2c_card_probe(struct ap_device *ap_dev)
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{
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/*
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* Normalized speed ratings per crypto adapter
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* MEX_1k, MEX_2k, MEX_4k, CRT_1k, CRT_2k, CRT_4k, RNG, SECKEY
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*/
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static const int CEX2C_SPEED_IDX[] = {
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1000, 1400, 2400, 1100, 1500, 2600, 100, 12};
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static const int CEX3C_SPEED_IDX[] = {
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500, 700, 1400, 550, 800, 1500, 80, 10};
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struct ap_card *ac = to_ap_card(&ap_dev->device);
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struct zcrypt_card *zc;
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int rc = 0;
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zc = zcrypt_card_alloc();
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if (!zc)
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return -ENOMEM;
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zc->card = ac;
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dev_set_drvdata(&ap_dev->device, zc);
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switch (ac->ap_dev.device_type) {
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case AP_DEVICE_TYPE_CEX2C:
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zc->user_space_type = ZCRYPT_CEX2C;
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zc->type_string = "CEX2C";
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zc->speed_rating = CEX2C_SPEED_IDX;
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zc->min_mod_size = CEX2C_MIN_MOD_SIZE;
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zc->max_mod_size = CEX2C_MAX_MOD_SIZE;
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zc->max_exp_bit_length = CEX2C_MAX_MOD_SIZE;
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break;
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case AP_DEVICE_TYPE_CEX3C:
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zc->user_space_type = ZCRYPT_CEX3C;
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zc->type_string = "CEX3C";
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zc->speed_rating = CEX3C_SPEED_IDX;
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zc->min_mod_size = CEX3C_MIN_MOD_SIZE;
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zc->max_mod_size = CEX3C_MAX_MOD_SIZE;
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zc->max_exp_bit_length = CEX3C_MAX_MOD_SIZE;
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break;
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default:
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zcrypt_card_free(zc);
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return -ENODEV;
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}
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zc->online = 1;
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rc = zcrypt_card_register(zc);
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if (rc) {
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zcrypt_card_free(zc);
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return rc;
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}
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if (ap_test_bit(&ac->functions, AP_FUNC_COPRO)) {
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rc = sysfs_create_group(&ap_dev->device.kobj,
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&cca_card_attr_grp);
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if (rc) {
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zcrypt_card_unregister(zc);
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zcrypt_card_free(zc);
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}
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}
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return rc;
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}
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/*
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* This is called to remove the CEX2C/CEX3C card driver information
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* if an AP card device is removed.
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*/
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static void zcrypt_cex2c_card_remove(struct ap_device *ap_dev)
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{
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struct zcrypt_card *zc = dev_get_drvdata(&ap_dev->device);
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struct ap_card *ac = to_ap_card(&ap_dev->device);
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if (ap_test_bit(&ac->functions, AP_FUNC_COPRO))
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sysfs_remove_group(&ap_dev->device.kobj, &cca_card_attr_grp);
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zcrypt_card_unregister(zc);
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}
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static struct ap_driver zcrypt_cex2c_card_driver = {
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.probe = zcrypt_cex2c_card_probe,
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.remove = zcrypt_cex2c_card_remove,
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.ids = zcrypt_cex2c_card_ids,
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.flags = AP_DRIVER_FLAG_DEFAULT,
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};
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/*
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* Probe function for CEX2C/CEX3C queue devices. It always accepts the
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* AP device since the bus_match already checked the hardware type.
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* @ap_dev: pointer to the AP card device.
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*/
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static int zcrypt_cex2c_queue_probe(struct ap_device *ap_dev)
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{
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struct ap_queue *aq = to_ap_queue(&ap_dev->device);
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struct zcrypt_queue *zq;
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int rc;
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zq = zcrypt_queue_alloc(CEX2C_MAX_XCRB_MESSAGE_SIZE);
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if (!zq)
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return -ENOMEM;
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zq->queue = aq;
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zq->online = 1;
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atomic_set(&zq->load, 0);
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ap_rapq(aq->qid);
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rc = zcrypt_cex2c_rng_supported(aq);
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if (rc < 0) {
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zcrypt_queue_free(zq);
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return rc;
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}
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if (rc)
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zq->ops = zcrypt_msgtype(MSGTYPE06_NAME,
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MSGTYPE06_VARIANT_DEFAULT);
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else
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zq->ops = zcrypt_msgtype(MSGTYPE06_NAME,
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MSGTYPE06_VARIANT_NORNG);
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ap_queue_init_state(aq);
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ap_queue_init_reply(aq, &zq->reply);
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aq->request_timeout = CEX2C_CLEANUP_TIME;
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dev_set_drvdata(&ap_dev->device, zq);
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rc = zcrypt_queue_register(zq);
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if (rc) {
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zcrypt_queue_free(zq);
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return rc;
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}
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if (ap_test_bit(&aq->card->functions, AP_FUNC_COPRO)) {
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rc = sysfs_create_group(&ap_dev->device.kobj,
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&cca_queue_attr_grp);
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if (rc) {
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zcrypt_queue_unregister(zq);
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zcrypt_queue_free(zq);
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}
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}
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return rc;
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}
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/*
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* This is called to remove the CEX2C/CEX3C queue driver information
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* if an AP queue device is removed.
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*/
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static void zcrypt_cex2c_queue_remove(struct ap_device *ap_dev)
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{
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struct zcrypt_queue *zq = dev_get_drvdata(&ap_dev->device);
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struct ap_queue *aq = to_ap_queue(&ap_dev->device);
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if (ap_test_bit(&aq->card->functions, AP_FUNC_COPRO))
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sysfs_remove_group(&ap_dev->device.kobj, &cca_queue_attr_grp);
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zcrypt_queue_unregister(zq);
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}
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static struct ap_driver zcrypt_cex2c_queue_driver = {
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.probe = zcrypt_cex2c_queue_probe,
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.remove = zcrypt_cex2c_queue_remove,
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.ids = zcrypt_cex2c_queue_ids,
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.flags = AP_DRIVER_FLAG_DEFAULT,
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};
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int __init zcrypt_cex2c_init(void)
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{
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int rc;
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rc = ap_driver_register(&zcrypt_cex2c_card_driver,
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THIS_MODULE, "cex2card");
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if (rc)
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return rc;
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rc = ap_driver_register(&zcrypt_cex2c_queue_driver,
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THIS_MODULE, "cex2cqueue");
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if (rc)
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ap_driver_unregister(&zcrypt_cex2c_card_driver);
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return rc;
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}
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void zcrypt_cex2c_exit(void)
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{
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ap_driver_unregister(&zcrypt_cex2c_queue_driver);
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ap_driver_unregister(&zcrypt_cex2c_card_driver);
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}
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module_init(zcrypt_cex2c_init);
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module_exit(zcrypt_cex2c_exit);
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