diff options
| author | Nicholas Piggin <npiggin@gmail.com> | 2016-12-19 21:30:08 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-04-28 14:02:25 +0300 |
| commit | ddd703ca06ede1b2d01ed1b0cb8d4315ab808099 (patch) | |
| tree | 16f3dbea636620e812642a85e4c8e1b549023051 /arch/powerpc/include/asm/smp.h | |
| parent | 2b4f3ac5642672595ef6f71d1572b32475e94863 (diff) | |
| download | linux-ddd703ca06ede1b2d01ed1b0cb8d4315ab808099.tar.xz | |
powerpc: Add NMI IPI infrastructure
Add a simple NMI IPI system that handles concurrency and reentrancy.
The platform does not have to implement a true non-maskable interrupt,
the default is to simply use the debugger break IPI message. This has
now been co-opted for a general IPI message, and users (debugger and
crash) have been reimplemented on top of the NMI system.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Incorporate incremental fixes from Nick]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/smp.h')
| -rw-r--r-- | arch/powerpc/include/asm/smp.h | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/arch/powerpc/include/asm/smp.h b/arch/powerpc/include/asm/smp.h index 751b2bd944fc..78c311ee0049 100644 --- a/arch/powerpc/include/asm/smp.h +++ b/arch/powerpc/include/asm/smp.h @@ -112,14 +112,22 @@ extern int cpu_to_core_id(int cpu); * * Make sure this matches openpic_request_IPIs in open_pic.c, or what shows up * in /proc/interrupts will be wrong!!! --Troy */ -#define PPC_MSG_CALL_FUNCTION 0 -#define PPC_MSG_RESCHEDULE 1 +#define PPC_MSG_CALL_FUNCTION 0 +#define PPC_MSG_RESCHEDULE 1 #define PPC_MSG_TICK_BROADCAST 2 -#define PPC_MSG_DEBUGGER_BREAK 3 +#define PPC_MSG_NMI_IPI 3 /* This is only used by the powernv kernel */ #define PPC_MSG_RM_HOST_ACTION 4 +#define NMI_IPI_ALL_OTHERS -2 + +#ifdef CONFIG_NMI_IPI +extern int smp_handle_nmi_ipi(struct pt_regs *regs); +#else +static inline int smp_handle_nmi_ipi(struct pt_regs *regs) { return 0; } +#endif + /* for irq controllers that have dedicated ipis per message (4) */ extern int smp_request_message_ipi(int virq, int message); extern const char *smp_ipi_name[]; |