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s390/ap: new low level inline functions ap_bapq() and ap_aapq()

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Introduce two new low level functions ap_bapq() (calls
PQAP(BAPQ)) and ap_aapq (calls PQAP(AAPQ)). Both functions
are only meant to be used in SE environment with the SE
AP binding facility available.

Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Holger Dengler <dengler@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Harald Freudenberger 2022-09-07 19:05:18 +02:00 committed by Heiko Carstens
parent 4bdf3c3956
commit c81cf436e4
1 changed files with 53 additions and 0 deletions
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53
arch/s390/include/asm/ap.h
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@ -354,6 +354,59 @@ static inline struct ap_queue_status ap_qact(ap_qid_t qid, int ifbit,
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