// SPDX-License-Identifier: GPL-2.0+
/*
 *  Copyright IBM Corp. 2001, 2012
 *  Author(s): Robert Burroughs
 *             Eric Rossman (edrossma@us.ibm.com)
 *
 *  Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
 *  Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
 *                                Ralph Wuerthner <rwuerthn@de.ibm.com>
 *  MSGTYPE restruct:             Holger Dengler <hd@linux.vnet.ibm.com>
 */

#define KMSG_COMPONENT "zcrypt"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/atomic.h>
#include <linux/uaccess.h>

#include "ap_bus.h"
#include "zcrypt_api.h"
#include "zcrypt_error.h"
#include "zcrypt_msgtype6.h"
#include "zcrypt_cca_key.h"

#define CEXXC_MAX_ICA_RESPONSE_SIZE 0x77c /* max size type86 v2 reply       */

#define CEIL4(x) ((((x)+3)/4)*4)

struct response_type {
        struct completion work;
        int type;
};
#define CEXXC_RESPONSE_TYPE_ICA  0
#define CEXXC_RESPONSE_TYPE_XCRB 1
#define CEXXC_RESPONSE_TYPE_EP11 2

MODULE_AUTHOR("IBM Corporation");
MODULE_DESCRIPTION("Cryptographic Coprocessor (message type 6), " \
                   "Copyright IBM Corp. 2001, 2012");
MODULE_LICENSE("GPL");

/*
 * CPRB
 *        Note that all shorts, ints and longs are little-endian.
 *        All pointer fields are 32-bits long, and mean nothing
 *
 *        A request CPRB is followed by a request_parameter_block.
 *
 *        The request (or reply) parameter block is organized thus:
 *          function code
 *          VUD block
 *          key block
 */
struct CPRB {
        unsigned short cprb_len;        /* CPRB length                   */
        unsigned char cprb_ver_id;      /* CPRB version id.              */
        unsigned char pad_000;          /* Alignment pad byte.           */
        unsigned char srpi_rtcode[4];   /* SRPI return code LELONG       */
        unsigned char srpi_verb;        /* SRPI verb type                */
        unsigned char flags;            /* flags                         */
        unsigned char func_id[2];       /* function id                   */
        unsigned char checkpoint_flag;  /*                               */
        unsigned char resv2;            /* reserved                      */
        unsigned short req_parml;       /* request parameter buffer      */
                                        /* length 16-bit little endian   */
        unsigned char req_parmp[4];     /* request parameter buffer      *
                                         * pointer (means nothing: the   *
                                         * parameter buffer follows      *
                                         * the CPRB).                    */
        unsigned char req_datal[4];     /* request data buffer           */
                                        /* length         ULELONG        */
        unsigned char req_datap[4];     /* request data buffer           */
                                        /* pointer                       */
        unsigned short rpl_parml;       /* reply  parameter buffer       */
                                        /* length 16-bit little endian   */
        unsigned char pad_001[2];       /* Alignment pad bytes. ULESHORT */
        unsigned char rpl_parmp[4];     /* reply parameter buffer        *
                                         * pointer (means nothing: the   *
                                         * parameter buffer follows      *
                                         * the CPRB).                    */
        unsigned char rpl_datal[4];     /* reply data buffer len ULELONG */
        unsigned char rpl_datap[4];     /* reply data buffer             */
                                        /* pointer                       */
        unsigned short ccp_rscode;      /* server reason code   ULESHORT */
        unsigned short ccp_rtcode;      /* server return code   ULESHORT */
        unsigned char repd_parml[2];    /* replied parameter len ULESHORT*/
        unsigned char mac_data_len[2];  /* Mac Data Length      ULESHORT */
        unsigned char repd_datal[4];    /* replied data length  ULELONG  */
        unsigned char req_pc[2];        /* PC identifier                 */
        unsigned char res_origin[8];    /* resource origin               */
        unsigned char mac_value[8];     /* Mac Value                     */
        unsigned char logon_id[8];      /* Logon Identifier              */
        unsigned char usage_domain[2];  /* cdx                           */
        unsigned char resv3[18];        /* reserved for requestor        */
        unsigned short svr_namel;       /* server name length  ULESHORT  */
        unsigned char svr_name[8];      /* server name                   */
} __packed;

struct function_and_rules_block {
        unsigned char function_code[2];
        unsigned short ulen;
        unsigned char only_rule[8];
} __packed;

/*
 * The following is used to initialize the CPRBX passed to the CEXxC/CEXxP
 * card in a type6 message. The 3 fields that must be filled in at execution
 * time are  req_parml, rpl_parml and usage_domain.
 * Everything about this interface is ascii/big-endian, since the
 * device does *not* have 'Intel inside'.
 *
 * The CPRBX is followed immediately by the parm block.
 * The parm block contains:
 * - function code ('PD' 0x5044 or 'PK' 0x504B)
 * - rule block (one of:)
 *   + 0x000A 'PKCS-1.2' (MCL2 'PD')
 *   + 0x000A 'ZERO-PAD' (MCL2 'PK')
 *   + 0x000A 'ZERO-PAD' (MCL3 'PD' or CEX2C 'PD')
 *   + 0x000A 'MRP     ' (MCL3 'PK' or CEX2C 'PK')
 * - VUD block
 */
static const struct CPRBX static_cprbx = {
        .cprb_len       =  0x00DC,
        .cprb_ver_id    =  0x02,
        .func_id        = {0x54, 0x32},
};

int speed_idx_cca(int req_type)
{
        switch (req_type) {
        case 0x4142:
        case 0x4149:
        case 0x414D:
        case 0x4341:
        case 0x4344:
        case 0x4354:
        case 0x4358:
        case 0x444B:
        case 0x4558:
        case 0x4643:
        case 0x4651:
        case 0x4C47:
        case 0x4C4B:
        case 0x4C51:
        case 0x4F48:
        case 0x504F:
        case 0x5053:
        case 0x5058:
        case 0x5343:
        case 0x5344:
        case 0x5345:
        case 0x5350:
                return LOW;
        case 0x414B:
        case 0x4345:
        case 0x4349:
        case 0x434D:
        case 0x4847:
        case 0x4849:
        case 0x484D:
        case 0x4850:
        case 0x4851:
        case 0x4954:
        case 0x4958:
        case 0x4B43:
        case 0x4B44:
        case 0x4B45:
        case 0x4B47:
        case 0x4B48:
        case 0x4B49:
        case 0x4B4E:
        case 0x4B50:
        case 0x4B52:
        case 0x4B54:
        case 0x4B58:
        case 0x4D50:
        case 0x4D53:
        case 0x4D56:
        case 0x4D58:
        case 0x5044:
        case 0x5045:
        case 0x5046:
        case 0x5047:
        case 0x5049:
        case 0x504B:
        case 0x504D:
        case 0x5254:
        case 0x5347:
        case 0x5349:
        case 0x534B:
        case 0x534D:
        case 0x5356:
        case 0x5358:
        case 0x5443:
        case 0x544B:
        case 0x5647:
                return HIGH;
        default:
                return MEDIUM;
        }
}

int speed_idx_ep11(int req_type)
{
        switch (req_type) {
        case  1:
        case  2:
        case 36:
        case 37:
        case 38:
        case 39:
        case 40:
                return LOW;
        case 17:
        case 18:
        case 19:
        case 20:
        case 21:
        case 22:
        case 26:
        case 30:
        case 31:
        case 32:
        case 33:
        case 34:
        case 35:
                return HIGH;
        default:
                return MEDIUM;
        }
}


/*
 * Convert a ICAMEX message to a type6 MEX message.
 *
 * @zq: crypto device pointer
 * @ap_msg: pointer to AP message
 * @mex: pointer to user input data
 *
 * Returns 0 on success or negative errno value.
 */
static int ICAMEX_msg_to_type6MEX_msgX(struct zcrypt_queue *zq,
                                       struct ap_message *ap_msg,
                                       struct ica_rsa_modexpo *mex)
{
        static struct type6_hdr static_type6_hdrX = {
                .type           =  0x06,
                .offset1        =  0x00000058,
                .agent_id       = {'C', 'A',},
                .function_code  = {'P', 'K'},
        };
        static struct function_and_rules_block static_pke_fnr = {
                .function_code  = {'P', 'K'},
                .ulen           = 10,
                .only_rule      = {'M', 'R', 'P', ' ', ' ', ' ', ' ', ' '}
        };
        struct {
                struct type6_hdr hdr;
                struct CPRBX cprbx;
                struct function_and_rules_block fr;
                unsigned short length;
                char text[0];
        } __packed * msg = ap_msg->msg;
        int size;

        /*
         * The inputdatalength was a selection criteria in the dispatching
         * function zcrypt_rsa_modexpo(). However, make sure the following
         * copy_from_user() never exceeds the allocated buffer space.
         */
        if (WARN_ON_ONCE(mex->inputdatalength > PAGE_SIZE))
                return -EINVAL;

        /* VUD.ciphertext */
        msg->length = mex->inputdatalength + 2;
        if (copy_from_user(msg->text, mex->inputdata, mex->inputdatalength))
                return -EFAULT;

        /* Set up key which is located after the variable length text. */
        size = zcrypt_type6_mex_key_en(mex, msg->text+mex->inputdatalength);
        if (size < 0)
                return size;
        size += sizeof(*msg) + mex->inputdatalength;

        /* message header, cprbx and f&r */
        msg->hdr = static_type6_hdrX;
        msg->hdr.ToCardLen1 = size - sizeof(msg->hdr);
        msg->hdr.FromCardLen1 = CEXXC_MAX_ICA_RESPONSE_SIZE - sizeof(msg->hdr);

        msg->cprbx = static_cprbx;
        msg->cprbx.domain = AP_QID_QUEUE(zq->queue->qid);
        msg->cprbx.rpl_msgbl = msg->hdr.FromCardLen1;

        msg->fr = static_pke_fnr;

        msg->cprbx.req_parml = size - sizeof(msg->hdr) - sizeof(msg->cprbx);

        ap_msg->len = size;
        return 0;
}

/*
 * Convert a ICACRT message to a type6 CRT message.
 *
 * @zq: crypto device pointer
 * @ap_msg: pointer to AP message
 * @crt: pointer to user input data
 *
 * Returns 0 on success or negative errno value.
 */
static int ICACRT_msg_to_type6CRT_msgX(struct zcrypt_queue *zq,
                                       struct ap_message *ap_msg,
                                       struct ica_rsa_modexpo_crt *crt)
{
        static struct type6_hdr static_type6_hdrX = {
                .type           =  0x06,
                .offset1        =  0x00000058,
                .agent_id       = {'C', 'A',},
                .function_code  = {'P', 'D'},
        };
        static struct function_and_rules_block static_pkd_fnr = {
                .function_code  = {'P', 'D'},
                .ulen           = 10,
                .only_rule      = {'Z', 'E', 'R', 'O', '-', 'P', 'A', 'D'}
        };

        struct {
                struct type6_hdr hdr;
                struct CPRBX cprbx;
                struct function_and_rules_block fr;
                unsigned short length;
                char text[0];
        } __packed * msg = ap_msg->msg;
        int size;

        /*
         * The inputdatalength was a selection criteria in the dispatching
         * function zcrypt_rsa_crt(). However, make sure the following
         * copy_from_user() never exceeds the allocated buffer space.
         */
        if (WARN_ON_ONCE(crt->inputdatalength > PAGE_SIZE))
                return -EINVAL;

        /* VUD.ciphertext */
        msg->length = crt->inputdatalength + 2;
        if (copy_from_user(msg->text, crt->inputdata, crt->inputdatalength))
                return -EFAULT;

        /* Set up key which is located after the variable length text. */
        size = zcrypt_type6_crt_key(crt, msg->text + crt->inputdatalength);
        if (size < 0)
                return size;
        size += sizeof(*msg) + crt->inputdatalength;    /* total size of msg */

        /* message header, cprbx and f&r */
        msg->hdr = static_type6_hdrX;
        msg->hdr.ToCardLen1 = size -  sizeof(msg->hdr);
        msg->hdr.FromCardLen1 = CEXXC_MAX_ICA_RESPONSE_SIZE - sizeof(msg->hdr);

        msg->cprbx = static_cprbx;
        msg->cprbx.domain = AP_QID_QUEUE(zq->queue->qid);
        msg->cprbx.req_parml = msg->cprbx.rpl_msgbl =
                size - sizeof(msg->hdr) - sizeof(msg->cprbx);

        msg->fr = static_pkd_fnr;

        ap_msg->len = size;
        return 0;
}

/*
 * Convert a XCRB message to a type6 CPRB message.
 *
 * @zq: crypto device pointer
 * @ap_msg: pointer to AP message
 * @xcRB: pointer to user input data
 *
 * Returns 0 on success or -EFAULT, -EINVAL.
 */
struct type86_fmt2_msg {
        struct type86_hdr hdr;
        struct type86_fmt2_ext fmt2;
} __packed;

static int XCRB_msg_to_type6CPRB_msgX(bool userspace, struct ap_message *ap_msg,
                                      struct ica_xcRB *xcRB,
                                      unsigned int *fcode,
                                      unsigned short **dom)
{
        static struct type6_hdr static_type6_hdrX = {
                .type           =  0x06,
                .offset1        =  0x00000058,
        };
        struct {
                struct type6_hdr hdr;
                struct CPRBX cprbx;
        } __packed * msg = ap_msg->msg;

        int rcblen = CEIL4(xcRB->request_control_blk_length);
        int req_sumlen, resp_sumlen;
        char *req_data = ap_msg->msg + sizeof(struct type6_hdr) + rcblen;
        char *function_code;

        if (CEIL4(xcRB->request_control_blk_length) <
                        xcRB->request_control_blk_length)
                return -EINVAL; /* overflow after alignment*/

        /* length checks */
        ap_msg->len = sizeof(struct type6_hdr) +
                CEIL4(xcRB->request_control_blk_length) +
                xcRB->request_data_length;
        if (ap_msg->len > ap_msg->bufsize)
                return -EINVAL;

        /*
         * Overflow check
         * sum must be greater (or equal) than the largest operand
         */
        req_sumlen = CEIL4(xcRB->request_control_blk_length) +
                        xcRB->request_data_length;
        if ((CEIL4(xcRB->request_control_blk_length) <=
                                                xcRB->request_data_length) ?
                (req_sumlen < xcRB->request_data_length) :
                (req_sumlen < CEIL4(xcRB->request_control_blk_length))) {
                return -EINVAL;
        }

        if (CEIL4(xcRB->reply_control_blk_length) <
                        xcRB->reply_control_blk_length)
                return -EINVAL; /* overflow after alignment*/

        /*
         * Overflow check
         * sum must be greater (or equal) than the largest operand
         */
        resp_sumlen = CEIL4(xcRB->reply_control_blk_length) +
                        xcRB->reply_data_length;
        if ((CEIL4(xcRB->reply_control_blk_length) <= xcRB->reply_data_length) ?
                (resp_sumlen < xcRB->reply_data_length) :
                (resp_sumlen < CEIL4(xcRB->reply_control_blk_length))) {
                return -EINVAL;
        }

        /* prepare type6 header */
        msg->hdr = static_type6_hdrX;
        memcpy(msg->hdr.agent_id, &(xcRB->agent_ID), sizeof(xcRB->agent_ID));
        msg->hdr.ToCardLen1 = xcRB->request_control_blk_length;
        if (xcRB->request_data_length) {
                msg->hdr.offset2 = msg->hdr.offset1 + rcblen;
                msg->hdr.ToCardLen2 = xcRB->request_data_length;
        }
        msg->hdr.FromCardLen1 = xcRB->reply_control_blk_length;
        msg->hdr.FromCardLen2 = xcRB->reply_data_length;

        /* prepare CPRB */
        if (z_copy_from_user(userspace, &(msg->cprbx), xcRB->request_control_blk_addr,
                             xcRB->request_control_blk_length))
                return -EFAULT;
        if (msg->cprbx.cprb_len + sizeof(msg->hdr.function_code) >
            xcRB->request_control_blk_length)
                return -EINVAL;
        function_code = ((unsigned char *)&msg->cprbx) + msg->cprbx.cprb_len;
        memcpy(msg->hdr.function_code, function_code,
               sizeof(msg->hdr.function_code));

        *fcode = (msg->hdr.function_code[0] << 8) | msg->hdr.function_code[1];
        *dom = (unsigned short *)&msg->cprbx.domain;

        if (memcmp(function_code, "US", 2) == 0
            || memcmp(function_code, "AU", 2) == 0)
                ap_msg->flags |= AP_MSG_FLAG_SPECIAL;

#ifdef CONFIG_ZCRYPT_DEBUG
        if (ap_msg->fi.flags & AP_FI_FLAG_TOGGLE_SPECIAL)
                ap_msg->flags ^= AP_MSG_FLAG_SPECIAL;
#endif

        /* copy data block */
        if (xcRB->request_data_length &&
            z_copy_from_user(userspace, req_data, xcRB->request_data_address,
                             xcRB->request_data_length))
                return -EFAULT;

        return 0;
}

static int xcrb_msg_to_type6_ep11cprb_msgx(bool userspace, struct ap_message *ap_msg,
                                           struct ep11_urb *xcRB,
                                           unsigned int *fcode)
{
        unsigned int lfmt;
        static struct type6_hdr static_type6_ep11_hdr = {
                .type           =  0x06,
                .rqid           = {0x00, 0x01},
                .function_code  = {0x00, 0x00},
                .agent_id[0]    =  0x58,        /* {'X'} */
                .agent_id[1]    =  0x43,        /* {'C'} */
                .offset1        =  0x00000058,
        };

        struct {
                struct type6_hdr hdr;
                struct ep11_cprb cprbx;
                unsigned char   pld_tag;        /* fixed value 0x30 */
                unsigned char   pld_lenfmt;     /* payload length format */
        } __packed * msg = ap_msg->msg;

        struct pld_hdr {
                unsigned char   func_tag;       /* fixed value 0x4 */
                unsigned char   func_len;       /* fixed value 0x4 */
                unsigned int    func_val;       /* function ID     */
                unsigned char   dom_tag;        /* fixed value 0x4 */
                unsigned char   dom_len;        /* fixed value 0x4 */
                unsigned int    dom_val;        /* domain id       */
        } __packed * payload_hdr = NULL;

        if (CEIL4(xcRB->req_len) < xcRB->req_len)
                return -EINVAL; /* overflow after alignment*/

        /* length checks */
        ap_msg->len = sizeof(struct type6_hdr) + CEIL4(xcRB->req_len);
        if (ap_msg->len > ap_msg->bufsize)
                return -EINVAL;

        if (CEIL4(xcRB->resp_len) < xcRB->resp_len)
                return -EINVAL; /* overflow after alignment*/

        /* prepare type6 header */
        msg->hdr = static_type6_ep11_hdr;
        msg->hdr.ToCardLen1   = xcRB->req_len;
        msg->hdr.FromCardLen1 = xcRB->resp_len;

        /* Import CPRB data from the ioctl input parameter */
        if (z_copy_from_user(userspace, &(msg->cprbx.cprb_len),
                             (char __force __user *)xcRB->req, xcRB->req_len)) {
                return -EFAULT;
        }

        if ((msg->pld_lenfmt & 0x80) == 0x80) { /*ext.len.fmt 2 or 3*/
                switch (msg->pld_lenfmt & 0x03) {
                case 1:
                        lfmt = 2;
                        break;
                case 2:
                        lfmt = 3;
                        break;
                default:
                        return -EINVAL;
                }
        } else {
                lfmt = 1; /* length format #1 */
        }
        payload_hdr = (struct pld_hdr *)((&(msg->pld_lenfmt))+lfmt);
        *fcode = payload_hdr->func_val & 0xFFFF;

        /* enable special processing based on the cprbs flags special bit */
        if (msg->cprbx.flags & 0x20)
                ap_msg->flags |= AP_MSG_FLAG_SPECIAL;

#ifdef CONFIG_ZCRYPT_DEBUG
        if (ap_msg->fi.flags & AP_FI_FLAG_TOGGLE_SPECIAL)
                ap_msg->flags ^= AP_MSG_FLAG_SPECIAL;
#endif

        return 0;
}

/*
 * Copy results from a type 86 ICA reply message back to user space.
 *
 * @zq: crypto device pointer
 * @reply: reply AP message.
 * @data: pointer to user output data
 * @length: size of user output data
 *
 * Returns 0 on success or -EINVAL, -EFAULT, -EAGAIN in case of an error.
 */
struct type86x_reply {
        struct type86_hdr hdr;
        struct type86_fmt2_ext fmt2;
        struct CPRBX cprbx;
        unsigned char pad[4];   /* 4 byte function code/rules block ? */
        unsigned short length;
        char text[];
} __packed;

struct type86_ep11_reply {
        struct type86_hdr hdr;
        struct type86_fmt2_ext fmt2;
        struct ep11_cprb cprbx;
} __packed;

static int convert_type86_ica(struct zcrypt_queue *zq,
                          struct ap_message *reply,
                          char __user *outputdata,
                          unsigned int outputdatalength)
{
        static unsigned char static_pad[] = {
                0x00, 0x02,
                0x1B, 0x7B, 0x5D, 0xB5, 0x75, 0x01, 0x3D, 0xFD,
                0x8D, 0xD1, 0xC7, 0x03, 0x2D, 0x09, 0x23, 0x57,
                0x89, 0x49, 0xB9, 0x3F, 0xBB, 0x99, 0x41, 0x5B,
                0x75, 0x21, 0x7B, 0x9D, 0x3B, 0x6B, 0x51, 0x39,
                0xBB, 0x0D, 0x35, 0xB9, 0x89, 0x0F, 0x93, 0xA5,
                0x0B, 0x47, 0xF1, 0xD3, 0xBB, 0xCB, 0xF1, 0x9D,
                0x23, 0x73, 0x71, 0xFF, 0xF3, 0xF5, 0x45, 0xFB,
                0x61, 0x29, 0x23, 0xFD, 0xF1, 0x29, 0x3F, 0x7F,
                0x17, 0xB7, 0x1B, 0xA9, 0x19, 0xBD, 0x57, 0xA9,
                0xD7, 0x95, 0xA3, 0xCB, 0xED, 0x1D, 0xDB, 0x45,
                0x7D, 0x11, 0xD1, 0x51, 0x1B, 0xED, 0x71, 0xE9,
                0xB1, 0xD1, 0xAB, 0xAB, 0x21, 0x2B, 0x1B, 0x9F,
                0x3B, 0x9F, 0xF7, 0xF7, 0xBD, 0x63, 0xEB, 0xAD,
                0xDF, 0xB3, 0x6F, 0x5B, 0xDB, 0x8D, 0xA9, 0x5D,
                0xE3, 0x7D, 0x77, 0x49, 0x47, 0xF5, 0xA7, 0xFD,
                0xAB, 0x2F, 0x27, 0x35, 0x77, 0xD3, 0x49, 0xC9,
                0x09, 0xEB, 0xB1, 0xF9, 0xBF, 0x4B, 0xCB, 0x2B,
                0xEB, 0xEB, 0x05, 0xFF, 0x7D, 0xC7, 0x91, 0x8B,
                0x09, 0x83, 0xB9, 0xB9, 0x69, 0x33, 0x39, 0x6B,
                0x79, 0x75, 0x19, 0xBF, 0xBB, 0x07, 0x1D, 0xBD,
                0x29, 0xBF, 0x39, 0x95, 0x93, 0x1D, 0x35, 0xC7,
                0xC9, 0x4D, 0xE5, 0x97, 0x0B, 0x43, 0x9B, 0xF1,
                0x16, 0x93, 0x03, 0x1F, 0xA5, 0xFB, 0xDB, 0xF3,
                0x27, 0x4F, 0x27, 0x61, 0x05, 0x1F, 0xB9, 0x23,
                0x2F, 0xC3, 0x81, 0xA9, 0x23, 0x71, 0x55, 0x55,
                0xEB, 0xED, 0x41, 0xE5, 0xF3, 0x11, 0xF1, 0x43,
                0x69, 0x03, 0xBD, 0x0B, 0x37, 0x0F, 0x51, 0x8F,
                0x0B, 0xB5, 0x89, 0x5B, 0x67, 0xA9, 0xD9, 0x4F,
                0x01, 0xF9, 0x21, 0x77, 0x37, 0x73, 0x79, 0xC5,
                0x7F, 0x51, 0xC1, 0xCF, 0x97, 0xA1, 0x75, 0xAD,
                0x35, 0x9D, 0xD3, 0xD3, 0xA7, 0x9D, 0x5D, 0x41,
                0x6F, 0x65, 0x1B, 0xCF, 0xA9, 0x87, 0x91, 0x09
        };
        struct type86x_reply *msg = reply->msg;
        unsigned short service_rc, service_rs;
        unsigned int reply_len, pad_len;
        char *data;

        service_rc = msg->cprbx.ccp_rtcode;
        if (unlikely(service_rc != 0)) {
                service_rs = msg->cprbx.ccp_rscode;
                if ((service_rc == 8 && service_rs == 66) ||
                    (service_rc == 8 && service_rs == 65) ||
                    (service_rc == 8 && service_rs == 72) ||
                    (service_rc == 8 && service_rs == 770) ||
                    (service_rc == 12 && service_rs == 769)) {
                        ZCRYPT_DBF_WARN("dev=%02x.%04x rc/rs=%d/%d => rc=EINVAL\n",
                                        AP_QID_CARD(zq->queue->qid),
                                        AP_QID_QUEUE(zq->queue->qid),
                                        (int) service_rc, (int) service_rs);
                        return -EINVAL;
                }
                zq->online = 0;
                pr_err("Crypto dev=%02x.%04x rc/rs=%d/%d online=0 rc=EAGAIN\n",
                       AP_QID_CARD(zq->queue->qid),
                       AP_QID_QUEUE(zq->queue->qid),
                       (int) service_rc, (int) service_rs);
                ZCRYPT_DBF_ERR("dev=%02x.%04x rc/rs=%d/%d => online=0 rc=EAGAIN\n",
                               AP_QID_CARD(zq->queue->qid),
                               AP_QID_QUEUE(zq->queue->qid),
                               (int) service_rc, (int) service_rs);
                ap_send_online_uevent(&zq->queue->ap_dev, zq->online);
                return -EAGAIN;
        }
        data = msg->text;
        reply_len = msg->length - 2;
        if (reply_len > outputdatalength)
                return -EINVAL;
        /*
         * For all encipher requests, the length of the ciphertext (reply_len)
         * will always equal the modulus length. For MEX decipher requests
         * the output needs to get padded. Minimum pad size is 10.
         *
         * Currently, the cases where padding will be added is for:
         * - PCIXCC_MCL2 using a CRT form token (since PKD didn't support
         *   ZERO-PAD and CRT is only supported for PKD requests)
         * - PCICC, always
         */
        pad_len = outputdatalength - reply_len;
        if (pad_len > 0) {
                if (pad_len < 10)
                        return -EINVAL;
                /* 'restore' padding left in the CEXXC card. */
                if (copy_to_user(outputdata, static_pad, pad_len - 1))
                        return -EFAULT;
                if (put_user(0, outputdata + pad_len - 1))
                        return -EFAULT;
        }
        /* Copy the crypto response to user space. */
        if (copy_to_user(outputdata + pad_len, data, reply_len))
                return -EFAULT;
        return 0;
}

/*
 * Copy results from a type 86 XCRB reply message back to user space.
 *
 * @zq: crypto device pointer
 * @reply: reply AP message.
 * @xcRB: pointer to XCRB
 *
 * Returns 0 on success or -EINVAL, -EFAULT, -EAGAIN in case of an error.
 */
static int convert_type86_xcrb(bool userspace, struct zcrypt_queue *zq,
                               struct ap_message *reply,
                               struct ica_xcRB *xcRB)
{
        struct type86_fmt2_msg *msg = reply->msg;
        char *data = reply->msg;

        /* Copy CPRB to user */
        if (z_copy_to_user(userspace, xcRB->reply_control_blk_addr,
                           data + msg->fmt2.offset1, msg->fmt2.count1))
                return -EFAULT;
        xcRB->reply_control_blk_length = msg->fmt2.count1;

        /* Copy data buffer to user */
        if (msg->fmt2.count2)
                if (z_copy_to_user(userspace, xcRB->reply_data_addr,
                                   data + msg->fmt2.offset2, msg->fmt2.count2))
                        return -EFAULT;
        xcRB->reply_data_length = msg->fmt2.count2;
        return 0;
}

/*
 * Copy results from a type 86 EP11 XCRB reply message back to user space.
 *
 * @zq: crypto device pointer
 * @reply: reply AP message.
 * @xcRB: pointer to EP11 user request block
 *
 * Returns 0 on success or -EINVAL, -EFAULT, -EAGAIN in case of an error.
 */
static int convert_type86_ep11_xcrb(bool userspace, struct zcrypt_queue *zq,
                                    struct ap_message *reply,
                                    struct ep11_urb *xcRB)
{
        struct type86_fmt2_msg *msg = reply->msg;
        char *data = reply->msg;

        if (xcRB->resp_len < msg->fmt2.count1)
                return -EINVAL;

        /* Copy response CPRB to user */
        if (z_copy_to_user(userspace, (char __force __user *)xcRB->resp,
                           data + msg->fmt2.offset1, msg->fmt2.count1))
                return -EFAULT;
        xcRB->resp_len = msg->fmt2.count1;
        return 0;
}

static int convert_type86_rng(struct zcrypt_queue *zq,
                          struct ap_message *reply,
                          char *buffer)
{
        struct {
                struct type86_hdr hdr;
                struct type86_fmt2_ext fmt2;
                struct CPRBX cprbx;
        } __packed * msg = reply->msg;
        char *data = reply->msg;

        if (msg->cprbx.ccp_rtcode != 0 || msg->cprbx.ccp_rscode != 0)
                return -EINVAL;
        memcpy(buffer, data + msg->fmt2.offset2, msg->fmt2.count2);
        return msg->fmt2.count2;
}

static int convert_response_ica(struct zcrypt_queue *zq,
                            struct ap_message *reply,
                            char __user *outputdata,
                            unsigned int outputdatalength)
{
        struct type86x_reply *msg = reply->msg;

        switch (msg->hdr.type) {
        case TYPE82_RSP_CODE:
        case TYPE88_RSP_CODE:
                return convert_error(zq, reply);
        case TYPE86_RSP_CODE:
                if (msg->cprbx.ccp_rtcode &&
                   (msg->cprbx.ccp_rscode == 0x14f) &&
                   (outputdatalength > 256)) {
                        if (zq->zcard->max_exp_bit_length <= 17) {
                                zq->zcard->max_exp_bit_length = 17;
                                return -EAGAIN;
                        } else
                                return -EINVAL;
                }
                if (msg->hdr.reply_code)
                        return convert_error(zq, reply);
                if (msg->cprbx.cprb_ver_id == 0x02)
                        return convert_type86_ica(zq, reply,
                                                  outputdata, outputdatalength);
                fallthrough;    /* wrong cprb version is an unknown response */
        default:
                /* Unknown response type, this should NEVER EVER happen */
                zq->online = 0;
                pr_err("Crypto dev=%02x.%04x unknown response type 0x%02x => online=0 rc=EAGAIN\n",
                       AP_QID_CARD(zq->queue->qid),
                       AP_QID_QUEUE(zq->queue->qid),
                       (int) msg->hdr.type);
                ZCRYPT_DBF_ERR("dev=%02x.%04x unknown response type 0x%02x => online=0 rc=EAGAIN\n",
                               AP_QID_CARD(zq->queue->qid),
                               AP_QID_QUEUE(zq->queue->qid),
                               (int) msg->hdr.type);
                ap_send_online_uevent(&zq->queue->ap_dev, zq->online);
                return -EAGAIN;
        }
}

static int convert_response_xcrb(bool userspace, struct zcrypt_queue *zq,
                                 struct ap_message *reply,
                                 struct ica_xcRB *xcRB)
{
        struct type86x_reply *msg = reply->msg;

        switch (msg->hdr.type) {
        case TYPE82_RSP_CODE:
        case TYPE88_RSP_CODE:
                xcRB->status = 0x0008044DL; /* HDD_InvalidParm */
                return convert_error(zq, reply);
        case TYPE86_RSP_CODE:
                if (msg->hdr.reply_code) {
                        memcpy(&(xcRB->status), msg->fmt2.apfs, sizeof(u32));
                        return convert_error(zq, reply);
                }
                if (msg->cprbx.cprb_ver_id == 0x02)
                        return convert_type86_xcrb(userspace, zq, reply, xcRB);
                fallthrough;    /* wrong cprb version is an unknown response */
        default: /* Unknown response type, this should NEVER EVER happen */
                xcRB->status = 0x0008044DL; /* HDD_InvalidParm */
                zq->online = 0;
                pr_err("Crypto dev=%02x.%04x unknown response type 0x%02x => online=0 rc=EAGAIN\n",
                       AP_QID_CARD(zq->queue->qid),
                       AP_QID_QUEUE(zq->queue->qid),
                       (int) msg->hdr.type);
                ZCRYPT_DBF_ERR("dev=%02x.%04x unknown response type 0x%02x => online=0 rc=EAGAIN\n",
                               AP_QID_CARD(zq->queue->qid),
                               AP_QID_QUEUE(zq->queue->qid),
                               (int) msg->hdr.type);
                ap_send_online_uevent(&zq->queue->ap_dev, zq->online);
                return -EAGAIN;
        }
}

static int convert_response_ep11_xcrb(bool userspace, struct zcrypt_queue *zq,
                                      struct ap_message *reply, struct ep11_urb *xcRB)
{
        struct type86_ep11_reply *msg = reply->msg;

        switch (msg->hdr.type) {
        case TYPE82_RSP_CODE:
        case TYPE87_RSP_CODE:
                return convert_error(zq, reply);
        case TYPE86_RSP_CODE:
                if (msg->hdr.reply_code)
                        return convert_error(zq, reply);
                if (msg->cprbx.cprb_ver_id == 0x04)
                        return convert_type86_ep11_xcrb(userspace, zq, reply, xcRB);
                fallthrough;    /* wrong cprb version is an unknown resp */
        default: /* Unknown response type, this should NEVER EVER happen */
                zq->online = 0;
                pr_err("Crypto dev=%02x.%04x unknown response type 0x%02x => online=0 rc=EAGAIN\n",
                       AP_QID_CARD(zq->queue->qid),
                       AP_QID_QUEUE(zq->queue->qid),
                       (int) msg->hdr.type);
                ZCRYPT_DBF_ERR("dev=%02x.%04x unknown response type 0x%02x => online=0 rc=EAGAIN\n",
                               AP_QID_CARD(zq->queue->qid),
                               AP_QID_QUEUE(zq->queue->qid),
                               (int) msg->hdr.type);
                ap_send_online_uevent(&zq->queue->ap_dev, zq->online);
                return -EAGAIN;
        }
}

static int convert_response_rng(struct zcrypt_queue *zq,
                                 struct ap_message *reply,
                                 char *data)
{
        struct type86x_reply *msg = reply->msg;

        switch (msg->hdr.type) {
        case TYPE82_RSP_CODE:
        case TYPE88_RSP_CODE:
                return -EINVAL;
        case TYPE86_RSP_CODE:
                if (msg->hdr.reply_code)
                        return -EINVAL;
                if (msg->cprbx.cprb_ver_id == 0x02)
                        return convert_type86_rng(zq, reply, data);
                fallthrough;    /* wrong cprb version is an unknown response */
        default: /* Unknown response type, this should NEVER EVER happen */
                zq->online = 0;
                pr_err("Crypto dev=%02x.%04x unknown response type 0x%02x => online=0 rc=EAGAIN\n",
                       AP_QID_CARD(zq->queue->qid),
                       AP_QID_QUEUE(zq->queue->qid),
                       (int) msg->hdr.type);
                ZCRYPT_DBF_ERR("dev=%02x.%04x unknown response type 0x%02x => online=0 rc=EAGAIN\n",
                               AP_QID_CARD(zq->queue->qid),
                               AP_QID_QUEUE(zq->queue->qid),
                               (int) msg->hdr.type);
                ap_send_online_uevent(&zq->queue->ap_dev, zq->online);
                return -EAGAIN;
        }
}

/*
 * This function is called from the AP bus code after a crypto request
 * "msg" has finished with the reply message "reply".
 * It is called from tasklet context.
 * @aq: pointer to the AP queue
 * @msg: pointer to the AP message
 * @reply: pointer to the AP reply message
 */
static void zcrypt_msgtype6_receive(struct ap_queue *aq,
                                  struct ap_message *msg,
                                  struct ap_message *reply)
{
        static struct error_hdr error_reply = {
                .type = TYPE82_RSP_CODE,
                .reply_code = REP82_ERROR_MACHINE_FAILURE,
        };
        struct response_type *resp_type =
                (struct response_type *) msg->private;
        struct type86x_reply *t86r;
        int len;

        /* Copy the reply message to the request message buffer. */
        if (!reply)
                goto out;       /* ap_msg->rc indicates the error */
        t86r = reply->msg;
        if (t86r->hdr.type == TYPE86_RSP_CODE &&
                 t86r->cprbx.cprb_ver_id == 0x02) {
                switch (resp_type->type) {
                case CEXXC_RESPONSE_TYPE_ICA:
                        len = sizeof(struct type86x_reply) + t86r->length - 2;
                        if (len > reply->bufsize || len > msg->bufsize) {
                                msg->rc = -EMSGSIZE;
                        } else {
                                memcpy(msg->msg, reply->msg, len);
                                msg->len = len;
                        }
                        break;
                case CEXXC_RESPONSE_TYPE_XCRB:
                        len = t86r->fmt2.offset2 + t86r->fmt2.count2;
                        if (len > reply->bufsize || len > msg->bufsize) {
                                msg->rc = -EMSGSIZE;
                        } else {
                                memcpy(msg->msg, reply->msg, len);
                                msg->len = len;
                        }
                        break;
                default:
                        memcpy(msg->msg, &error_reply, sizeof(error_reply));
                }
        } else
                memcpy(msg->msg, reply->msg, sizeof(error_reply));
out:
        complete(&(resp_type->work));
}

/*
 * This function is called from the AP bus code after a crypto request
 * "msg" has finished with the reply message "reply".
 * It is called from tasklet context.
 * @aq: pointer to the AP queue
 * @msg: pointer to the AP message
 * @reply: pointer to the AP reply message
 */
static void zcrypt_msgtype6_receive_ep11(struct ap_queue *aq,
                                         struct ap_message *msg,
                                         struct ap_message *reply)
{
        static struct error_hdr error_reply = {
                .type = TYPE82_RSP_CODE,
                .reply_code = REP82_ERROR_MACHINE_FAILURE,
        };
        struct response_type *resp_type =
                (struct response_type *)msg->private;
        struct type86_ep11_reply *t86r;
        int len;

        /* Copy the reply message to the request message buffer. */
        if (!reply)
                goto out;       /* ap_msg->rc indicates the error */
        t86r = reply->msg;
        if (t86r->hdr.type == TYPE86_RSP_CODE &&
            t86r->cprbx.cprb_ver_id == 0x04) {
                switch (resp_type->type) {
                case CEXXC_RESPONSE_TYPE_EP11:
                        len = t86r->fmt2.offset1 + t86r->fmt2.count1;
                        if (len > reply->bufsize || len > msg->bufsize) {
                                msg->rc = -EMSGSIZE;

                        } else {
                                memcpy(msg->msg, reply->msg, len);
                                msg->len = len;
                        }
                        break;
                default:
                        memcpy(msg->msg, &error_reply, sizeof(error_reply));
                }
        } else {
                memcpy(msg->msg, reply->msg, sizeof(error_reply));
        }
out:
        complete(&(resp_type->work));
}

static atomic_t zcrypt_step = ATOMIC_INIT(0);

/*
 * The request distributor calls this function if it picked the CEXxC
 * device to handle a modexpo request.
 * @zq: pointer to zcrypt_queue structure that identifies the
 *      CEXxC device to the request distributor
 * @mex: pointer to the modexpo request buffer
 */
static long zcrypt_msgtype6_modexpo(struct zcrypt_queue *zq,
                                    struct ica_rsa_modexpo *mex,
                                    struct ap_message *ap_msg)
{
        struct response_type resp_type = {
                .type = CEXXC_RESPONSE_TYPE_ICA,
        };
        int rc;

        ap_msg->msg = (void *) get_zeroed_page(GFP_KERNEL);
        if (!ap_msg->msg)
                return -ENOMEM;
        ap_msg->bufsize = PAGE_SIZE;
        ap_msg->receive = zcrypt_msgtype6_receive;
        ap_msg->psmid = (((unsigned long long) current->pid) << 32) +
                atomic_inc_return(&zcrypt_step);
        ap_msg->private = &resp_type;
        rc = ICAMEX_msg_to_type6MEX_msgX(zq, ap_msg, mex);
        if (rc)
                goto out_free;
        init_completion(&resp_type.work);
        rc = ap_queue_message(zq->queue, ap_msg);
        if (rc)
                goto out_free;
        rc = wait_for_completion_interruptible(&resp_type.work);
        if (rc == 0) {
                rc = ap_msg->rc;
                if (rc == 0)
                        rc = convert_response_ica(zq, ap_msg,
                                                  mex->outputdata,
                                                  mex->outputdatalength);
        } else
                /* Signal pending. */
                ap_cancel_message(zq->queue, ap_msg);
out_free:
        free_page((unsigned long) ap_msg->msg);
        ap_msg->private = NULL;
        ap_msg->msg = NULL;
        return rc;
}

/*
 * The request distributor calls this function if it picked the CEXxC
 * device to handle a modexpo_crt request.
 * @zq: pointer to zcrypt_queue structure that identifies the
 *      CEXxC device to the request distributor
 * @crt: pointer to the modexpoc_crt request buffer
 */
static long zcrypt_msgtype6_modexpo_crt(struct zcrypt_queue *zq,
                                        struct ica_rsa_modexpo_crt *crt,
                                        struct ap_message *ap_msg)
{
        struct response_type resp_type = {
                .type = CEXXC_RESPONSE_TYPE_ICA,
        };
        int rc;

        ap_msg->msg = (void *) get_zeroed_page(GFP_KERNEL);
        if (!ap_msg->msg)
                return -ENOMEM;
        ap_msg->bufsize = PAGE_SIZE;
        ap_msg->receive = zcrypt_msgtype6_receive;
        ap_msg->psmid = (((unsigned long long) current->pid) << 32) +
                atomic_inc_return(&zcrypt_step);
        ap_msg->private = &resp_type;
        rc = ICACRT_msg_to_type6CRT_msgX(zq, ap_msg, crt);
        if (rc)
                goto out_free;
        init_completion(&resp_type.work);
        rc = ap_queue_message(zq->queue, ap_msg);
        if (rc)
                goto out_free;
        rc = wait_for_completion_interruptible(&resp_type.work);
        if (rc == 0) {
                rc = ap_msg->rc;
                if (rc == 0)
                        rc = convert_response_ica(zq, ap_msg,
                                                  crt->outputdata,
                                                  crt->outputdatalength);
        } else {
                /* Signal pending. */
                ap_cancel_message(zq->queue, ap_msg);
        }
out_free:
        free_page((unsigned long) ap_msg->msg);
        ap_msg->private = NULL;
        ap_msg->msg = NULL;
        return rc;
}

/*
 * Fetch function code from cprb.
 * Extracting the fc requires to copy the cprb from userspace.
 * So this function allocates memory and needs an ap_msg prepared
 * by the caller with ap_init_message(). Also the caller has to
 * make sure ap_release_message() is always called even on failure.
 */
unsigned int get_cprb_fc(bool userspace, struct ica_xcRB *xcRB,
                         struct ap_message *ap_msg,
                         unsigned int *func_code, unsigned short **dom)
{
        struct response_type resp_type = {
                .type = CEXXC_RESPONSE_TYPE_XCRB,
        };

        ap_msg->bufsize = atomic_read(&ap_max_msg_size);
        ap_msg->msg = kmalloc(ap_msg->bufsize, GFP_KERNEL);
        if (!ap_msg->msg)
                return -ENOMEM;
        ap_msg->receive = zcrypt_msgtype6_receive;
        ap_msg->psmid = (((unsigned long long) current->pid) << 32) +
                                atomic_inc_return(&zcrypt_step);
        ap_msg->private = kmemdup(&resp_type, sizeof(resp_type), GFP_KERNEL);
        if (!ap_msg->private)
                return -ENOMEM;
        return XCRB_msg_to_type6CPRB_msgX(userspace, ap_msg, xcRB, func_code, dom);
}

/*
 * The request distributor calls this function if it picked the CEXxC
 * device to handle a send_cprb request.
 * @zq: pointer to zcrypt_queue structure that identifies the
 *      CEXxC device to the request distributor
 * @xcRB: pointer to the send_cprb request buffer
 */
static long zcrypt_msgtype6_send_cprb(bool userspace, struct zcrypt_queue *zq,
                                      struct ica_xcRB *xcRB,
                                      struct ap_message *ap_msg)
{
        int rc;
        struct response_type *rtype = (struct response_type *)(ap_msg->private);

        init_completion(&rtype->work);
        rc = ap_queue_message(zq->queue, ap_msg);
        if (rc)
                goto out;
        rc = wait_for_completion_interruptible(&rtype->work);
        if (rc == 0) {
                rc = ap_msg->rc;
                if (rc == 0)
                        rc = convert_response_xcrb(userspace, zq, ap_msg, xcRB);
        } else
                /* Signal pending. */
                ap_cancel_message(zq->queue, ap_msg);
out:
        return rc;
}

/*
 * Fetch function code from ep11 cprb.
 * Extracting the fc requires to copy the ep11 cprb from userspace.
 * So this function allocates memory and needs an ap_msg prepared
 * by the caller with ap_init_message(). Also the caller has to
 * make sure ap_release_message() is always called even on failure.
 */
unsigned int get_ep11cprb_fc(bool userspace, struct ep11_urb *xcrb,
                             struct ap_message *ap_msg,
                             unsigned int *func_code)
{
        struct response_type resp_type = {
                .type = CEXXC_RESPONSE_TYPE_EP11,
        };

        ap_msg->bufsize = atomic_read(&ap_max_msg_size);
        ap_msg->msg = kmalloc(ap_msg->bufsize, GFP_KERNEL);
        if (!ap_msg->msg)
                return -ENOMEM;
        ap_msg->receive = zcrypt_msgtype6_receive_ep11;
        ap_msg->psmid = (((unsigned long long) current->pid) << 32) +
                                atomic_inc_return(&zcrypt_step);
        ap_msg->private = kmemdup(&resp_type, sizeof(resp_type), GFP_KERNEL);
        if (!ap_msg->private)
                return -ENOMEM;
        return xcrb_msg_to_type6_ep11cprb_msgx(userspace, ap_msg, xcrb, func_code);
}

/*
 * The request distributor calls this function if it picked the CEX4P
 * device to handle a send_ep11_cprb request.
 * @zq: pointer to zcrypt_queue structure that identifies the
 *        CEX4P device to the request distributor
 * @xcRB: pointer to the ep11 user request block
 */
static long zcrypt_msgtype6_send_ep11_cprb(bool userspace, struct zcrypt_queue *zq,
                                           struct ep11_urb *xcrb,
                                           struct ap_message *ap_msg)
{
        int rc;
        unsigned int lfmt;
        struct response_type *rtype = (struct response_type *)(ap_msg->private);
        struct {
                struct type6_hdr hdr;
                struct ep11_cprb cprbx;
                unsigned char   pld_tag;        /* fixed value 0x30 */
                unsigned char   pld_lenfmt;     /* payload length format */
        } __packed * msg = ap_msg->msg;
        struct pld_hdr {
                unsigned char   func_tag;       /* fixed value 0x4 */
                unsigned char   func_len;       /* fixed value 0x4 */
                unsigned int    func_val;       /* function ID     */
                unsigned char   dom_tag;        /* fixed value 0x4 */
                unsigned char   dom_len;        /* fixed value 0x4 */
                unsigned int    dom_val;        /* domain id       */
        } __packed * payload_hdr = NULL;


        /*
         * The target domain field within the cprb body/payload block will be
         * replaced by the usage domain for non-management commands only.
         * Therefore we check the first bit of the 'flags' parameter for
         * management command indication.
         *   0 - non management command
         *   1 - management command
         */
        if (!((msg->cprbx.flags & 0x80) == 0x80)) {
                msg->cprbx.target_id = (unsigned int)
                                        AP_QID_QUEUE(zq->queue->qid);

                if ((msg->pld_lenfmt & 0x80) == 0x80) { /*ext.len.fmt 2 or 3*/
                        switch (msg->pld_lenfmt & 0x03) {
                        case 1:
                                lfmt = 2;
                                break;
                        case 2:
                                lfmt = 3;
                                break;
                        default:
                                return -EINVAL;
                        }
                } else {
                        lfmt = 1; /* length format #1 */
                }
                payload_hdr = (struct pld_hdr *)((&(msg->pld_lenfmt))+lfmt);
                payload_hdr->dom_val = (unsigned int)
                                        AP_QID_QUEUE(zq->queue->qid);
        }

        init_completion(&rtype->work);
        rc = ap_queue_message(zq->queue, ap_msg);
        if (rc)
                goto out;
        rc = wait_for_completion_interruptible(&rtype->work);
        if (rc == 0) {
                rc = ap_msg->rc;
                if (rc == 0)
                        rc = convert_response_ep11_xcrb(userspace, zq, ap_msg, xcrb);
        } else
                /* Signal pending. */
                ap_cancel_message(zq->queue, ap_msg);
out:
        return rc;
}

unsigned int get_rng_fc(struct ap_message *ap_msg, int *func_code,
                                                   unsigned int *domain)
{
        struct response_type resp_type = {
                .type = CEXXC_RESPONSE_TYPE_XCRB,
        };

        ap_msg->bufsize = AP_DEFAULT_MAX_MSG_SIZE;
        ap_msg->msg = kmalloc(ap_msg->bufsize, GFP_KERNEL);
        if (!ap_msg->msg)
                return -ENOMEM;
        ap_msg->receive = zcrypt_msgtype6_receive;
        ap_msg->psmid = (((unsigned long long) current->pid) << 32) +
                                atomic_inc_return(&zcrypt_step);
        ap_msg->private = kmemdup(&resp_type, sizeof(resp_type), GFP_KERNEL);
        if (!ap_msg->private)
                return -ENOMEM;

        rng_type6CPRB_msgX(ap_msg, ZCRYPT_RNG_BUFFER_SIZE, domain);

        *func_code = HWRNG;
        return 0;
}

/*
 * The request distributor calls this function if it picked the CEXxC
 * device to generate random data.
 * @zq: pointer to zcrypt_queue structure that identifies the
 *      CEXxC device to the request distributor
 * @buffer: pointer to a memory page to return random data
 */
static long zcrypt_msgtype6_rng(struct zcrypt_queue *zq,
                                char *buffer, struct ap_message *ap_msg)
{
        struct {
                struct type6_hdr hdr;
                struct CPRBX cprbx;
                char function_code[2];
                short int rule_length;
                char rule[8];
                short int verb_length;
                short int key_length;
        } __packed * msg = ap_msg->msg;
        struct response_type *rtype = (struct response_type *)(ap_msg->private);
        int rc;

        msg->cprbx.domain = AP_QID_QUEUE(zq->queue->qid);

        init_completion(&rtype->work);
        rc = ap_queue_message(zq->queue, ap_msg);
        if (rc)
                goto out;
        rc = wait_for_completion_interruptible(&rtype->work);
        if (rc == 0) {
                rc = ap_msg->rc;
                if (rc == 0)
                        rc = convert_response_rng(zq, ap_msg, buffer);
        } else
                /* Signal pending. */
                ap_cancel_message(zq->queue, ap_msg);
out:
        return rc;
}

/*
 * The crypto operations for a CEXxC card.
 */
static struct zcrypt_ops zcrypt_msgtype6_norng_ops = {
        .owner = THIS_MODULE,
        .name = MSGTYPE06_NAME,
        .variant = MSGTYPE06_VARIANT_NORNG,
        .rsa_modexpo = zcrypt_msgtype6_modexpo,
        .rsa_modexpo_crt = zcrypt_msgtype6_modexpo_crt,
        .send_cprb = zcrypt_msgtype6_send_cprb,
};

static struct zcrypt_ops zcrypt_msgtype6_ops = {
        .owner = THIS_MODULE,
        .name = MSGTYPE06_NAME,
        .variant = MSGTYPE06_VARIANT_DEFAULT,
        .rsa_modexpo = zcrypt_msgtype6_modexpo,
        .rsa_modexpo_crt = zcrypt_msgtype6_modexpo_crt,
        .send_cprb = zcrypt_msgtype6_send_cprb,
        .rng = zcrypt_msgtype6_rng,
};

static struct zcrypt_ops zcrypt_msgtype6_ep11_ops = {
        .owner = THIS_MODULE,
        .name = MSGTYPE06_NAME,
        .variant = MSGTYPE06_VARIANT_EP11,
        .rsa_modexpo = NULL,
        .rsa_modexpo_crt = NULL,
        .send_ep11_cprb = zcrypt_msgtype6_send_ep11_cprb,
};

void __init zcrypt_msgtype6_init(void)
{
        zcrypt_msgtype_register(&zcrypt_msgtype6_norng_ops);
        zcrypt_msgtype_register(&zcrypt_msgtype6_ops);
        zcrypt_msgtype_register(&zcrypt_msgtype6_ep11_ops);
}

void __exit zcrypt_msgtype6_exit(void)
{
        zcrypt_msgtype_unregister(&zcrypt_msgtype6_norng_ops);
        zcrypt_msgtype_unregister(&zcrypt_msgtype6_ops);
        zcrypt_msgtype_unregister(&zcrypt_msgtype6_ep11_ops);
}