diff options
| author | Tobias Huschle <huschle@linux.ibm.com> | 2024-08-12 13:39:27 +0200 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2024-08-29 22:56:34 +0200 |
| commit | 2c6c9ccc76434d5609300aa578a4737e1686b320 (patch) | |
| tree | 12d5ebc7d5b121569eb3617549a844b188a595de /arch/s390/kernel | |
| parent | 324db0faf8e1cbfde7a033e77f674f2bb819b54e (diff) | |
s390/wti: Introduce infrastructure for warning track interrupt
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>
Diffstat (limited to 'arch/s390/kernel')
| -rw-r--r-- | arch/s390/kernel/diag.c | 17 | ||||
| -rw-r--r-- | arch/s390/kernel/irq.c | 1 |
2 files changed, 18 insertions, 0 deletions
diff --git a/arch/s390/kernel/diag.c b/arch/s390/kernel/diag.c index ac7b8c8e3133..007e1795670e 100644 --- a/arch/s390/kernel/diag.c +++ b/arch/s390/kernel/diag.c @@ -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); diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c index 1af5a08d72ab..2639a3d12736 100644 --- a/arch/s390/kernel/irq.c +++ b/arch/s390/kernel/irq.c @@ -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"}, |