/* SPDX-License-Identifier: GPL-2.0 */
/*
* Adjunct processor ( AP ) interfaces
*
* Copyright IBM Corp . 2017
*
* Author ( s ) : Tony Krowiak < akrowia @ linux . vnet . ibm . com >
* Martin Schwidefsky < schwidefsky @ de . ibm . com >
* Harald Freudenberger < freude @ de . ibm . com >
*/
#ifndef _ASM_S390_AP_H_
#define _ASM_S390_AP_H_
#include <linux/io.h>
#include <asm /asm -extable.h>
/**
* The ap_qid_t identifier of an ap queue .
* If the AP facilities test ( APFT ) facility is available ,
* card and queue index are 8 bit values , otherwise
* card index is 6 bit and queue index a 4 bit value .
*/
typedef unsigned int ap_qid_t;
#define AP_MKQID(_card, _queue) (((_card) & 0 xff) << 8 | ((_queue) & 0 xff))
#define AP_QID_CARD(_qid) (((_qid) >> 8 ) & 0 xff)
#define AP_QID_QUEUE(_qid) ((_qid) & 0 xff)
/**
* struct ap_queue_status - Holds the AP queue status .
* @ queue_empty : Shows if queue is empty
* @ replies_waiting : Waiting replies
* @ queue_full : Is 1 if the queue is full
* @ irq_enabled : Shows if interrupts are enabled for the AP
* @ response_code : Holds the 8 bit response code
*
* The ap queue status word is returned by all three AP functions
* ( PQAP , NQAP and DQAP ) . There ' s a set of flags in the first
* byte , followed by a 1 byte response code .
*/
struct ap_queue_status {
unsigned int queue_empty : 1 ;
unsigned int replies_waiting : 1 ;
unsigned int queue_full : 1 ;
unsigned int : 3 ;
unsigned int async : 1 ;
unsigned int irq_enabled : 1 ;
unsigned int response_code : 8 ;
unsigned int : 16 ;
};
/*
* AP queue status reg union to access the reg1
* register with the lower 32 bits comprising the
* ap queue status .
*/
union ap_queue_status_reg {
unsigned long value;
struct {
u32 _pad;
struct ap_queue_status status;
};
};
/**
* ap_intructions_available ( ) - Test if AP instructions are available .
*
* Returns true if the AP instructions are installed , otherwise false .
*/
static inline bool ap_instructions_available(void )
{
unsigned long reg0 = AP_MKQID(0 , 0 );
unsigned long reg1 = 0 ;
asm volatile (
" lgr 0,%[reg0]\n" /* qid into gr0 */
" lghi 1,0\n" /* 0 into gr1 */
" lghi 2,0\n" /* 0 into gr2 */
" .insn rre,0xb2af0000,0,0\n" /* PQAP(TAPQ) */
"0: la %[reg1],1\n" /* 1 into reg1 */
"1:\n"
EX_TABLE(0 b, 1 b)
: [reg1] "+&d" (reg1)
: [reg0] "d" (reg0)
: "cc" , "0" , "1" , "2" );
return reg1 != 0 ;
}
/* TAPQ register GR2 response struct */
struct ap_tapq_hwinfo {
union {
unsigned long value;
struct {
unsigned int fac : 32 ; /* facility bits */
unsigned int apinfo : 32 ; /* ap type, ... */
};
struct {
unsigned int apsc : 1 ; /* APSC */
unsigned int mex4k : 1 ; /* AP4KM */
unsigned int crt4k : 1 ; /* AP4KC */
unsigned int cca : 1 ; /* D */
unsigned int accel : 1 ; /* A */
unsigned int ep11 : 1 ; /* X */
unsigned int apxa : 1 ; /* APXA */
unsigned int slcf : 1 ; /* Cmd filtering avail. */
unsigned int class : 8 ;
unsigned int bs : 2 ; /* SE bind/assoc */
unsigned int : 14 ;
unsigned int at : 8 ; /* ap type */
unsigned int nd : 8 ; /* nr of domains */
unsigned int : 4 ;
unsigned int ml : 4 ; /* apxl ml */
unsigned int : 4 ;
unsigned int qd : 4 ; /* queue depth */
};
};
};
/*
* Convenience defines to be used with the bs field from struct ap_tapq_gr2
*/
#define AP_BS_Q_USABLE 0
#define AP_BS_Q_USABLE_NO_SECURE_KEY 1
#define AP_BS_Q_AVAIL_FOR_BINDING 2
#define AP_BS_Q_UNUSABLE 3
/**
* ap_tapq ( ) : Test adjunct processor queue .
* @ qid : The AP queue number
* @ info : Pointer to tapq hwinfo struct
*
* Returns AP queue status structure .
*/
static inline struct ap_queue_status ap_tapq(ap_qid_t qid,
struct ap_tapq_hwinfo *info)
{
union ap_queue_status_reg reg1;
unsigned long reg2;
asm volatile (
" lgr 0,%[qid]\n" /* qid into gr0 */
" lghi 2,0\n" /* 0 into gr2 */
" .insn rre,0xb2af0000,0,0\n" /* PQAP(TAPQ) */
" lgr %[reg1],1\n" /* gr1 (status) into reg1 */
" lgr %[reg2],2\n" /* gr2 into reg2 */
: [reg1] "=&d" (reg1.value), [reg2] "=&d" (reg2)
: [qid] "d" (qid)
: "cc" , "0" , "1" , "2" );
if (info)
info->value = reg2;
return reg1.status;
}
/**
* ap_test_queue ( ) : Test adjunct processor queue .
* @ qid : The AP queue number
* @ tbit : Test facilities bit
* @ info : Ptr to tapq gr2 struct
*
* Returns AP queue status structure .
*/
static inline struct ap_queue_status ap_test_queue(ap_qid_t qid, int tbit,
struct ap_tapq_hwinfo *info)
{
if (tbit)
qid |= 1 UL << 23 ; /* set T bit*/
return ap_tapq(qid, info);
}
/**
* ap_pqap_rapq ( ) : Reset adjunct processor queue .
* @ qid : The AP queue number
* @ fbit : if ! = 0 set F bit
*
* Returns AP queue status structure .
*/
static inline struct ap_queue_status ap_rapq(ap_qid_t qid, int fbit)
{
unsigned long reg0 = qid | (1 UL << 24 ); /* fc 1UL is RAPQ */
union ap_queue_status_reg reg1;
if (fbit)
reg0 |= 1 UL << 22 ;
asm volatile (
" lgr 0,%[reg0]\n" /* qid arg into gr0 */
" .insn rre,0xb2af0000,0,0\n" /* PQAP(RAPQ) */
" lgr %[reg1],1\n" /* gr1 (status) into reg1 */
: [reg1] "=&d" (reg1.value)
: [reg0] "d" (reg0)
: "cc" , "0" , "1" );
return reg1.status;
}
/**
* ap_pqap_zapq ( ) : Reset and zeroize adjunct processor queue .
* @ qid : The AP queue number
* @ fbit : if ! = 0 set F bit
*
* Returns AP queue status structure .
*/
static inline struct ap_queue_status ap_zapq(ap_qid_t qid, int fbit)
{
unsigned long reg0 = qid | (2 UL << 24 ); /* fc 2UL is ZAPQ */
union ap_queue_status_reg reg1;
if (fbit)
reg0 |= 1 UL << 22 ;
asm volatile (
" lgr 0,%[reg0]\n" /* qid arg into gr0 */
" .insn rre,0xb2af0000,0,0\n" /* PQAP(ZAPQ) */
" lgr %[reg1],1\n" /* gr1 (status) into reg1 */
: [reg1] "=&d" (reg1.value)
: [reg0] "d" (reg0)
: "cc" , "0" , "1" );
return reg1.status;
}
/**
* struct ap_config_info - convenience struct for AP crypto
* config info as returned by the ap_qci ( ) function .
*/
struct ap_config_info {
union {
unsigned int flags;
struct {
unsigned int apsc : 1 ; /* S bit */
unsigned int apxa : 1 ; /* N bit */
unsigned int qact : 1 ; /* C bit */
unsigned int rc8a : 1 ; /* R bit */
unsigned int : 4 ;
unsigned int apsb : 1 ; /* B bit */
unsigned int : 23 ;
};
};
unsigned char na; /* max # of APs - 1 */
unsigned char nd; /* max # of Domains - 1 */
unsigned char _reserved0[10 ];
unsigned int apm[8 ]; /* AP ID mask */
unsigned int aqm[8 ]; /* AP (usage) queue mask */
unsigned int adm[8 ]; /* AP (control) domain mask */
unsigned char _reserved1[16 ];
} __aligned(8 );
/**
* ap_qci ( ) : Get AP configuration data
*
* Returns 0 on success , or - EOPNOTSUPP .
*/
static inline int ap_qci(struct ap_config_info *config)
{
unsigned long reg0 = 4 UL << 24 ; /* fc 4UL is QCI */
unsigned long reg1 = -EOPNOTSUPP;
struct ap_config_info *reg2 = config;
asm volatile (
" lgr 0,%[reg0]\n" /* QCI fc into gr0 */
" lgr 2,%[reg2]\n" /* ptr to config into gr2 */
" .insn rre,0xb2af0000,0,0\n" /* PQAP(QCI) */
"0: la %[reg1],0\n" /* good case, QCI fc available */
"1:\n"
EX_TABLE(0 b, 1 b)
: [reg1] "+&d" (reg1)
: [reg0] "d" (reg0), [reg2] "d" (reg2)
: "cc" , "memory" , "0" , "2" );
return reg1;
}
/*
* struct ap_qirq_ctrl - convenient struct for easy invocation
* of the ap_aqic ( ) function . This struct is passed as GR1
* parameter to the PQAP ( AQIC ) instruction . For details please
* see the AR documentation .
*/
union ap_qirq_ctrl {
unsigned long value;
struct {
unsigned int : 8 ;
unsigned int zone : 8 ; /* zone info */
unsigned int ir : 1 ; /* ir flag: enable (1) or disable (0) irq */
unsigned int : 4 ;
unsigned int gisc : 3 ; /* guest isc field */
unsigned int : 6 ;
unsigned int gf : 2 ; /* gisa format */
unsigned int : 1 ;
unsigned int gisa : 27 ; /* gisa origin */
unsigned int : 1 ;
unsigned int isc : 3 ; /* irq sub class */
};
};
/**
* ap_aqic ( ) : Control interruption for a specific AP .
* @ qid : The AP queue number
* @ qirqctrl : struct ap_qirq_ctrl ( 64 bit value )
* @ pa_ind : Physical address of the notification indicator byte
*
* Returns AP queue status .
*/
static inline struct ap_queue_status ap_aqic(ap_qid_t qid,
union ap_qirq_ctrl qirqctrl,
phys_addr_t pa_ind)
{
unsigned long reg0 = qid | (3 UL << 24 ); /* fc 3UL is AQIC */
union ap_queue_status_reg reg1;
unsigned long reg2 = pa_ind;
reg1.value = qirqctrl.value;
asm volatile (
" lgr 0,%[reg0]\n" /* qid param into gr0 */
" lgr 1,%[reg1]\n" /* irq ctrl into gr1 */
" lgr 2,%[reg2]\n" /* ni addr into gr2 */
" .insn rre,0xb2af0000,0,0\n" /* PQAP(AQIC) */
" lgr %[reg1],1\n" /* gr1 (status) into reg1 */
: [reg1] "+&d" (reg1.value)
: [reg0] "d" (reg0), [reg2] "d" (reg2)
: "cc" , "memory" , "0" , "1" , "2" );
return reg1.status;
}
/*
* union ap_qact_ap_info - used together with the
* ap_aqic ( ) function to provide a convenient way
* to handle the ap info needed by the qact function .
*/
union ap_qact_ap_info {
unsigned long val;
struct {
unsigned int : 3 ;
unsigned int mode : 3 ;
unsigned int : 26 ;
unsigned int cat : 8 ;
unsigned int : 8 ;
unsigned char ver[2 ];
};
};
/**
* ap_qact ( ) : Query AP compatibility type .
* @ qid : The AP queue number
* @ apinfo : On input the info about the AP queue . On output the
* alternate AP queue info provided by the qact function
* in GR2 is stored in .
*
* Returns AP queue status . Check response_code field for failures .
*/
static inline struct ap_queue_status ap_qact(ap_qid_t qid, int ifbit,
union ap_qact_ap_info *apinfo)
{
unsigned long reg0 = qid | (5 UL << 24 ) | ((ifbit & 0 x01) << 22 );
union ap_queue_status_reg reg1;
unsigned long reg2;
reg1.value = apinfo->val;
asm volatile (
" lgr 0,%[reg0]\n" /* qid param into gr0 */
" lgr 1,%[reg1]\n" /* qact in info into gr1 */
" .insn rre,0xb2af0000,0,0\n" /* PQAP(QACT) */
" lgr %[reg1],1\n" /* gr1 (status) into reg1 */
" lgr %[reg2],2\n" /* qact out info into reg2 */
: [reg1] "+&d" (reg1.value), [reg2] "=&d" (reg2)
: [reg0] "d" (reg0)
: "cc" , "0" , "1" , "2" );
apinfo->val = reg2;
return reg1.status;
}
/*
* ap_bapq ( ) : SE bind AP queue .
* @ qid : The AP queue number
*
* Returns AP queue status structure .
*
* Invoking this function in a non - SE environment
* may case a specification exception .
*/
static inline struct ap_queue_status ap_bapq(ap_qid_t qid)
{
unsigned long reg0 = qid | (7 UL << 24 ); /* fc 7 is BAPQ */
union ap_queue_status_reg reg1;
asm volatile (
" lgr 0,%[reg0]\n" /* qid arg into gr0 */
" .insn rre,0xb2af0000,0,0\n" /* PQAP(BAPQ) */
" lgr %[reg1],1\n" /* gr1 (status) into reg1 */
: [reg1] "=&d" (reg1.value)
: [reg0] "d" (reg0)
: "cc" , "0" , "1" );
return reg1.status;
}
/*
* ap_aapq ( ) : SE associate AP queue .
* @ qid : The AP queue number
* @ sec_idx : The secret index
*
* Returns AP queue status structure .
*
* Invoking this function in a non - SE environment
* may case a specification exception .
*/
static inline struct ap_queue_status ap_aapq(ap_qid_t qid, unsigned int sec_idx)
{
unsigned long reg0 = qid | (8 UL << 24 ); /* fc 8 is AAPQ */
unsigned long reg2 = sec_idx;
union ap_queue_status_reg reg1;
asm volatile (
" lgr 0,%[reg0]\n" /* qid arg into gr0 */
" lgr 2,%[reg2]\n" /* secret index into gr2 */
" .insn rre,0xb2af0000,0,0\n" /* PQAP(AAPQ) */
" lgr %[reg1],1\n" /* gr1 (status) into reg1 */
: [reg1] "=&d" (reg1.value)
: [reg0] "d" (reg0), [reg2] "d" (reg2)
: "cc" , "0" , "1" , "2" );
return reg1.status;
}
/**
* ap_nqap ( ) : Send message to adjunct processor queue .
* @ qid : The AP queue number
* @ psmid : The program supplied message identifier
* @ msg : The message text
* @ length : The message length
*
* Returns AP queue status structure .
* Condition code 1 on NQAP can ' t happen because the L bit is 1 .
* Condition code 2 on NQAP also means the send is incomplete ,
* because a segment boundary was reached . The NQAP is repeated .
*/
static inline struct ap_queue_status ap_nqap(ap_qid_t qid,
unsigned long long psmid,
void *msg, size_t length)
{
unsigned long reg0 = qid | 0 x40000000UL; /* 0x4... is last msg part */
union register_pair nqap_r1, nqap_r2;
union ap_queue_status_reg reg1;
nqap_r1.even = (unsigned int )(psmid >> 32 );
nqap_r1.odd = psmid & 0 xffffffff;
nqap_r2.even = (unsigned long )msg;
nqap_r2.odd = (unsigned long )length;
asm volatile (
" lgr 0,%[reg0]\n" /* qid param in gr0 */
"0: .insn rre,0xb2ad0000,%[nqap_r1],%[nqap_r2]\n"
" brc 2,0b\n" /* handle partial completion */
" lgr %[reg1],1\n" /* gr1 (status) into reg1 */
: [reg0] "+&d" (reg0), [reg1] "=&d" (reg1.value),
[nqap_r2] "+&d" (nqap_r2.pair)
: [nqap_r1] "d" (nqap_r1.pair)
: "cc" , "memory" , "0" , "1" );
return reg1.status;
}
/**
* ap_dqap ( ) : Receive message from adjunct processor queue .
* @ qid : The AP queue number
* @ psmid : Pointer to program supplied message identifier
* @ msg : Pointer to message buffer
* @ msglen : Message buffer size
* @ length : Pointer to length of actually written bytes
* @ reslength : Residual length on return
* @ resgr0 : input : gr0 value ( only used if ! = 0 ) , output : residual gr0 content
*
* Returns AP queue status structure .
* Condition code 1 on DQAP means the receive has taken place
* but only partially . The response is incomplete , hence the
* DQAP is repeated .
* Condition code 2 on DQAP also means the receive is incomplete ,
* this time because a segment boundary was reached . Again , the
* DQAP is repeated .
* Note that gpr2 is used by the DQAP instruction to keep track of
* any ' residual ' length , in case the instruction gets interrupted .
* Hence it gets zeroed before the instruction .
* If the message does not fit into the buffer , this function will
* return with a truncated message and the reply in the firmware queue
* is not removed . This is indicated to the caller with an
* ap_queue_status response_code value of all bits on ( 0 xFF ) and ( if
* the reslength ptr is given ) the remaining length is stored in
* * reslength and ( if the resgr0 ptr is given ) the updated gr0 value
* for further processing of this msg entry is stored in * resgr0 . The
* caller needs to detect this situation and should invoke ap_dqap
* with a valid resgr0 ptr and a value in there ! = 0 to indicate that
* * resgr0 is to be used instead of qid to further process this entry .
*/
static inline struct ap_queue_status ap_dqap(ap_qid_t qid,
unsigned long *psmid,
void *msg, size_t msglen,
size_t *length,
size_t *reslength,
unsigned long *resgr0)
{
unsigned long reg0 = resgr0 && *resgr0 ? *resgr0 : qid | 0 x80000000UL;
union ap_queue_status_reg reg1;
unsigned long reg2;
union register_pair rp1, rp2;
rp1.even = 0 UL;
rp1.odd = 0 UL;
rp2.even = (unsigned long )msg;
rp2.odd = (unsigned long )msglen;
asm volatile (
" lgr 0,%[reg0]\n" /* qid param into gr0 */
" lghi 2,0\n" /* 0 into gr2 (res length) */
"0: ltgr %N[rp2],%N[rp2]\n" /* check buf len */
" jz 2f\n" /* go out if buf len is 0 */
"1: .insn rre,0xb2ae0000,%[rp1],%[rp2]\n"
" brc 6,0b\n" /* handle partial complete */
"2: lgr %[reg0],0\n" /* gr0 (qid + info) into reg0 */
" lgr %[reg1],1\n" /* gr1 (status) into reg1 */
" lgr %[reg2],2\n" /* gr2 (res length) into reg2 */
: [reg0] "+&d" (reg0), [reg1] "=&d" (reg1.value),
[reg2] "=&d" (reg2), [rp1] "+&d" (rp1.pair),
[rp2] "+&d" (rp2.pair)
:
: "cc" , "memory" , "0" , "1" , "2" );
if (reslength)
*reslength = reg2;
if (reg2 != 0 && rp2.odd == 0 ) {
/*
* Partially complete , status in gr1 is not set .
* Signal the caller that this dqap is only partially received
* with a special status response code 0 xFF and * resgr0 updated
*/
reg1.status.response_code = 0 xFF;
if (resgr0)
*resgr0 = reg0;
} else {
*psmid = (rp1.even << 32 ) + rp1.odd;
if (resgr0)
*resgr0 = 0 ;
}
/* update *length with the nr of bytes stored into the msg buffer */
if (length)
*length = msglen - rp2.odd;
return reg1.status;
}
#endif /* _ASM_S390_AP_H_ */
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