Viewing file:  ap.h (12.79 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Adjunct processor (AP) interfaces
*
* Copyright IBM Corp. 2017
*
* Author(s): Tony Krowiak <[email protected]>
* Martin Schwidefsky <[email protected]>
* Harald Freudenberger <[email protected]>
*/
#ifndef _ASM_S390_AP_H_
#define _ASM_S390_AP_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 _pad1 : 4;
unsigned int irq_enabled : 1;
unsigned int response_code : 8;
unsigned int _pad2 : 16;
};
/**
* 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 */
" .long 0xb2af0000\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;
}
/**
* ap_tapq(): Test adjunct processor queue.
* @qid: The AP queue number
* @info: Pointer to queue descriptor
*
* Returns AP queue status structure.
*/
static inline struct ap_queue_status ap_tapq(ap_qid_t qid, unsigned long *info)
{
struct ap_queue_status reg1;
unsigned long reg2;
asm volatile(
" lgr 0,%[qid]\n" /* qid into gr0 */
" lghi 2,0\n" /* 0 into gr2 */
" .long 0xb2af0000\n" /* PQAP(TAPQ) */
" lgr %[reg1],1\n" /* gr1 (status) into reg1 */
" lgr %[reg2],2\n" /* gr2 into reg2 */
: [reg1] "=&d" (reg1), [reg2] "=&d" (reg2)
: [qid] "d" (qid)
: "cc", "0", "1", "2");
if (info)
*info = reg2;
return reg1;
}
/**
* ap_test_queue(): Test adjunct processor queue.
* @qid: The AP queue number
* @tbit: Test facilities bit
* @info: Pointer to queue descriptor
*
* Returns AP queue status structure.
*/
static inline struct ap_queue_status ap_test_queue(ap_qid_t qid,
int tbit,
unsigned long *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
*
* Returns AP queue status structure.
*/
static inline struct ap_queue_status ap_rapq(ap_qid_t qid)
{
unsigned long reg0 = qid | (1UL << 24); /* fc 1UL is RAPQ */
struct ap_queue_status reg1;
asm volatile(
" lgr 0,%[reg0]\n" /* qid arg into gr0 */
" .long 0xb2af0000\n" /* PQAP(RAPQ) */
" lgr %[reg1],1\n" /* gr1 (status) into reg1 */
: [reg1] "=&d" (reg1)
: [reg0] "d" (reg0)
: "cc", "0", "1");
return reg1;
}
/**
* ap_pqap_zapq(): Reset and zeroize adjunct processor queue.
* @qid: The AP queue number
*
* Returns AP queue status structure.
*/
static inline struct ap_queue_status ap_zapq(ap_qid_t qid)
{
unsigned long reg0 = qid | (2UL << 24); /* fc 2UL is ZAPQ */
struct ap_queue_status reg1;
asm volatile(
" lgr 0,%[reg0]\n" /* qid arg into gr0 */
" .long 0xb2af0000\n" /* PQAP(ZAPQ) */
" lgr %[reg1],1\n" /* gr1 (status) into reg1 */
: [reg1] "=&d" (reg1)
: [reg0] "d" (reg0)
: "cc", "0", "1");
return reg1;
}
/**
* 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 char _reserved1 : 4;
unsigned char _reserved2[3];
unsigned char Na; /* max # of APs - 1 */
unsigned char Nd; /* max # of Domains - 1 */
unsigned char _reserved3[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 _reserved4[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 */
" .long 0xb2af0000\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.
*/
struct ap_qirq_ctrl {
unsigned int _res1 : 8;
unsigned int zone : 8; /* zone info */
unsigned int ir : 1; /* ir flag: enable (1) or disable (0) irq */
unsigned int _res2 : 4;
unsigned int gisc : 3; /* guest isc field */
unsigned int _res3 : 6;
unsigned int gf : 2; /* gisa format */
unsigned int _res4 : 1;
unsigned int gisa : 27; /* gisa origin */
unsigned int _res5 : 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)
* @ind: The notification indicator byte
*
* Returns AP queue status.
*/
static inline struct ap_queue_status ap_aqic(ap_qid_t qid,
struct ap_qirq_ctrl qirqctrl,
void *ind)
{
unsigned long reg0 = qid | (3UL << 24); /* fc 3UL is AQIC */
union {
unsigned long value;
struct ap_qirq_ctrl qirqctrl;
struct {
u32 _pad;
struct ap_queue_status status;
};
} reg1;
void *reg2 = ind;
reg1.qirqctrl = qirqctrl;
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 */
" .long 0xb2af0000\n" /* PQAP(AQIC) */
" lgr %[reg1],1\n" /* gr1 (status) into reg1 */
: [reg1] "+&d" (reg1)
: [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 combatibility 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 {
unsigned long value;
struct {
u32 _pad;
struct ap_queue_status status;
};
} 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 */
" .long 0xb2af0000\n" /* PQAP(QACT) */
" lgr %[reg1],1\n" /* gr1 (status) into reg1 */
" lgr %[reg2],2\n" /* qact out info into reg2 */
: [reg1] "+&d" (reg1), [reg2] "=&d" (reg2)
: [reg0] "d" (reg0)
: "cc", "0", "1", "2");
apinfo->val = reg2;
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;
struct ap_queue_status 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),
[nqap_r2] "+&d" (nqap_r2.pair)
: [nqap_r1] "d" (nqap_r1.pair)
: "cc", "memory", "0", "1");
return reg1;
}
/**
* ap_dqap(): Receive message from adjunct processor queue.
* @qid: The AP queue number
* @psmid: Pointer to program supplied message identifier
* @msg: The message text
* @length: The message length
* @reslength: Resitual length on return
* @resgr0: input: gr0 value (only used if != 0), output: resitual 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 long *psmid,
void *msg, size_t length,
size_t *reslength,
unsigned long *resgr0)
{
unsigned long reg0 = resgr0 && *resgr0 ? *resgr0 : qid | 0x80000000UL;
struct ap_queue_status reg1;
unsigned long reg2;
union register_pair rp1, rp2;
rp1.even = 0UL;
rp1.odd = 0UL;
rp2.even = (unsigned long)msg;
rp2.odd = (unsigned long)length;
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), [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.response_code = 0xFF;
if (resgr0)
*resgr0 = reg0;
} else {
*psmid = (((unsigned long long)rp1.even) << 32) + rp1.odd;
if (resgr0)
*resgr0 = 0;
}
return reg1;
}
/*
* 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_ */
|