1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Adjunct processor (AP) interfaces 4 * 5 * Copyright IBM Corp. 2017 6 * 7 * Author(s): Tony Krowiak <akrowia@linux.vnet.ibm.com> 8 * Martin Schwidefsky <schwidefsky@de.ibm.com> 9 * Harald Freudenberger <freude@de.ibm.com> 10 */ 11 12 #ifndef _ASM_S390_AP_H_ 13 #define _ASM_S390_AP_H_ 14 15 /** 16 * The ap_qid_t identifier of an ap queue. 17 * If the AP facilities test (APFT) facility is available, 18 * card and queue index are 8 bit values, otherwise 19 * card index is 6 bit and queue index a 4 bit value. 20 */ 21 typedef unsigned int ap_qid_t; 22 23 #define AP_MKQID(_card, _queue) (((_card) & 63) << 8 | ((_queue) & 255)) 24 #define AP_QID_CARD(_qid) (((_qid) >> 8) & 63) 25 #define AP_QID_QUEUE(_qid) ((_qid) & 255) 26 27 /** 28 * struct ap_queue_status - Holds the AP queue status. 29 * @queue_empty: Shows if queue is empty 30 * @replies_waiting: Waiting replies 31 * @queue_full: Is 1 if the queue is full 32 * @irq_enabled: Shows if interrupts are enabled for the AP 33 * @response_code: Holds the 8 bit response code 34 * 35 * The ap queue status word is returned by all three AP functions 36 * (PQAP, NQAP and DQAP). There's a set of flags in the first 37 * byte, followed by a 1 byte response code. 38 */ 39 struct ap_queue_status { 40 unsigned int queue_empty : 1; 41 unsigned int replies_waiting : 1; 42 unsigned int queue_full : 1; 43 unsigned int _pad1 : 4; 44 unsigned int irq_enabled : 1; 45 unsigned int response_code : 8; 46 unsigned int _pad2 : 16; 47 }; 48 49 /** 50 * ap_test_queue(): Test adjunct processor queue. 51 * @qid: The AP queue number 52 * @tbit: Test facilities bit 53 * @info: Pointer to queue descriptor 54 * 55 * Returns AP queue status structure. 56 */ 57 struct ap_queue_status ap_test_queue(ap_qid_t qid, 58 int tbit, 59 unsigned long *info); 60 61 struct ap_config_info { 62 unsigned int apsc : 1; /* S bit */ 63 unsigned int apxa : 1; /* N bit */ 64 unsigned int qact : 1; /* C bit */ 65 unsigned int rc8a : 1; /* R bit */ 66 unsigned char _reserved1 : 4; 67 unsigned char _reserved2[3]; 68 unsigned char Na; /* max # of APs - 1 */ 69 unsigned char Nd; /* max # of Domains - 1 */ 70 unsigned char _reserved3[10]; 71 unsigned int apm[8]; /* AP ID mask */ 72 unsigned int aqm[8]; /* AP queue mask */ 73 unsigned int adm[8]; /* AP domain mask */ 74 unsigned char _reserved4[16]; 75 } __aligned(8); 76 77 /* 78 * ap_query_configuration(): Fetch cryptographic config info 79 * 80 * Returns the ap configuration info fetched via PQAP(QCI). 81 * On success 0 is returned, on failure a negative errno 82 * is returned, e.g. if the PQAP(QCI) instruction is not 83 * available, the return value will be -EOPNOTSUPP. 84 */ 85 int ap_query_configuration(struct ap_config_info *info); 86 87 /* 88 * struct ap_qirq_ctrl - convenient struct for easy invocation 89 * of the ap_queue_irq_ctrl() function. This struct is passed 90 * as GR1 parameter to the PQAP(AQIC) instruction. For details 91 * please see the AR documentation. 92 */ 93 struct ap_qirq_ctrl { 94 unsigned int _res1 : 8; 95 unsigned int zone : 8; /* zone info */ 96 unsigned int ir : 1; /* ir flag: enable (1) or disable (0) irq */ 97 unsigned int _res2 : 4; 98 unsigned int gisc : 3; /* guest isc field */ 99 unsigned int _res3 : 6; 100 unsigned int gf : 2; /* gisa format */ 101 unsigned int _res4 : 1; 102 unsigned int gisa : 27; /* gisa origin */ 103 unsigned int _res5 : 1; 104 unsigned int isc : 3; /* irq sub class */ 105 }; 106 107 /** 108 * ap_queue_irq_ctrl(): Control interruption on a AP queue. 109 * @qid: The AP queue number 110 * @qirqctrl: struct ap_qirq_ctrl, see above 111 * @ind: The notification indicator byte 112 * 113 * Returns AP queue status. 114 * 115 * Control interruption on the given AP queue. 116 * Just a simple wrapper function for the low level PQAP(AQIC) 117 * instruction available for other kernel modules. 118 */ 119 struct ap_queue_status ap_queue_irq_ctrl(ap_qid_t qid, 120 struct ap_qirq_ctrl qirqctrl, 121 void *ind); 122 123 #endif /* _ASM_S390_AP_H_ */ 124