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s390/wti: Introduce infrastructure for warning track interrupt

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The warning-track interrupt (wti) provides a notification that the
receiving CPU will be pre-empted from its physical CPU within a short
time frame. This time frame is called grace period and depends on the
machine type. Giving up the CPU on time may prevent a task to get stuck
while holding a resource.

Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Reviewed-by: Mete Durlu <meted@linux.ibm.com>
Signed-off-by: Tobias Huschle <huschle@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Tobias Huschle 2024-08-12 13:39:27 +02:00 committed by Vasily Gorbik
parent 324db0faf8
commit 2c6c9ccc76
7 changed files with 34 additions and 2 deletions
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5
arch/s390/include/asm/ctlreg.h
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@ -202,8 +202,9 @@ union ctlreg0 {
unsigned long : 3;
unsigned long ccc : 1; /* Cryptography counter control */
unsigned long pec : 1; /* PAI extension control */
unsigned long : 17;
unsigned long : 3;
unsigned long : 15;
unsigned long wti : 1; /* Warning-track */
unsigned long : 4;
unsigned long lap : 1; /* Low-address-protection control */
unsigned long : 4;
unsigned long edat : 1; /* Enhanced-DAT-enablement control */

9
arch/s390/include/asm/diag.h
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@ -38,6 +38,7 @@ enum diag_stat_enum {
DIAG_STAT_X308,
DIAG_STAT_X318,
DIAG_STAT_X320,
DIAG_STAT_X49C,
DIAG_STAT_X500,
NR_DIAG_STAT
};
@ -363,4 +364,12 @@ void _diag0c_amode31(unsigned long rx);
void _diag308_reset_amode31(void);
int _diag8c_amode31(struct diag8c *addr, struct ccw_dev_id *devno, size_t len);
/* diag 49c subcodes */
enum diag49c_sc {
DIAG49C_SUBC_ACK = 0,
DIAG49C_SUBC_REG = 1
};
int diag49c(unsigned long subcode);
#endif /* _ASM_S390_DIAG_H */

2
arch/s390/include/asm/irq.h
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@ -47,6 +47,7 @@ enum interruption_class {
IRQEXT_CMS,
IRQEXT_CMC,
IRQEXT_FTP,
IRQEXT_WTI,
IRQIO_CIO,
IRQIO_DAS,
IRQIO_C15,
@ -99,6 +100,7 @@ int unregister_external_irq(u16 code, ext_int_handler_t handler);
enum irq_subclass {
IRQ_SUBCLASS_MEASUREMENT_ALERT = 5,
IRQ_SUBCLASS_SERVICE_SIGNAL = 9,
IRQ_SUBCLASS_WARNING_TRACK = 33,
};
#define CR0_IRQ_SUBCLASS_MASK \

1
arch/s390/include/asm/sclp.h
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@ -72,6 +72,7 @@ struct sclp_info {
unsigned char has_core_type : 1;
unsigned char has_sprp : 1;
unsigned char has_hvs : 1;
unsigned char has_wti : 1;
unsigned char has_esca : 1;
unsigned char has_sief2 : 1;
unsigned char has_64bscao : 1;

17
arch/s390/kernel/diag.c
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@ -52,6 +52,7 @@ static const struct diag_desc diag_map[NR_DIAG_STAT] = {
[DIAG_STAT_X308] = { .code = 0x308, .name = "List-Directed IPL" },
[DIAG_STAT_X318] = { .code = 0x318, .name = "CP Name and Version Codes" },
[DIAG_STAT_X320] = { .code = 0x320, .name = "Certificate Store" },
[DIAG_STAT_X49C] = { .code = 0x49c, .name = "Warning-Track Interruption" },
[DIAG_STAT_X500] = { .code = 0x500, .name = "Virtio Service" },
};
@ -303,3 +304,19 @@ int diag26c(void *req, void *resp, enum diag26c_sc subcode)
return diag_amode31_ops.diag26c(virt_to_phys(req), virt_to_phys(resp), subcode);
}
EXPORT_SYMBOL(diag26c);
int diag49c(unsigned long subcode)
{
int rc;
diag_stat_inc(DIAG_STAT_X49C);
asm volatile(
" diag %[subcode],0,0x49c\n"
" ipm %[rc]\n"
" srl %[rc],28\n"
: [rc] "=d" (rc)
: [subcode] "d" (subcode)
: "cc");
return rc;
}
EXPORT_SYMBOL(diag49c);

1
arch/s390/kernel/irq.c
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@ -76,6 +76,7 @@ static const struct irq_class irqclass_sub_desc[] = {
{.irq = IRQEXT_CMS, .name = "CMS", .desc = "[EXT] CPU-Measurement: Sampling"},
{.irq = IRQEXT_CMC, .name = "CMC", .desc = "[EXT] CPU-Measurement: Counter"},
{.irq = IRQEXT_FTP, .name = "FTP", .desc = "[EXT] HMC FTP Service"},
{.irq = IRQEXT_WTI, .name = "WTI", .desc = "[EXT] Warning Track"},
{.irq = IRQIO_CIO, .name = "CIO", .desc = "[I/O] Common I/O Layer Interrupt"},
{.irq = IRQIO_DAS, .name = "DAS", .desc = "[I/O] DASD"},
{.irq = IRQIO_C15, .name = "C15", .desc = "[I/O] 3215"},

1
drivers/s390/char/sclp_early.c
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@ -44,6 +44,7 @@ static void __init sclp_early_facilities_detect(void)
sclp.has_ibs = !!(sccb->fac117 & 0x20);
sclp.has_gisaf = !!(sccb->fac118 & 0x08);
sclp.has_hvs = !!(sccb->fac119 & 0x80);
sclp.has_wti = !!(sccb->fac119 & 0x40);
sclp.has_kss = !!(sccb->fac98 & 0x01);
sclp.has_aisii = !!(sccb->fac118 & 0x40);
sclp.has_aeni = !!(sccb->fac118 & 0x20);