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ap.h
/* 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) & 0xff) << 8 | ((_queue) & 0xff)) #define AP_QID_CARD(_qid) (((_qid) >> 8) & 0xff) #define AP_QID_QUEUE(_qid) ((_qid) & 0xff) /** * 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(0b, 1b) : [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 : 1; 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 |= 1UL << 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 | (1UL << 24); /* fc 1UL is RAPQ */ union ap_queue_status_reg reg1; if (fbit) reg0 |= 1UL << 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 | (2UL << 24); /* fc 2UL is ZAPQ */ union ap_queue_status_reg reg1; if (fbit) reg0 |= 1UL << 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 { 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 = 4UL << 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(0b, 1b) : [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 | (3UL << 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 | (5UL << 24) | ((ifbit & 0x01) << 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 | (7UL << 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 | (8UL << 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 | 0x40000000UL; /* 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 & 0xffffffff; 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 (0xFF) 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 | 0x80000000UL; union ap_queue_status_reg reg1; unsigned long reg2; union register_pair rp1, rp2; rp1.even = 0UL; rp1.odd = 0UL; 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 0xFF and *resgr0 updated */ reg1.status.response_code = 0xFF; 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; } /* * Interface to tell the AP bus code that a configuration * change has happened. The bus code should at least do * an ap bus resource rescan. */ #if IS_ENABLED(CONFIG_ZCRYPT) void ap_bus_cfg_chg(void); #else static inline void ap_bus_cfg_chg(void){} #endif #endif /* _ASM_S390_AP_H_ */
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