From 25ddd738c2ebffb6c2d3cf29c91b986d1bb39c99 Mon Sep 17 00:00:00 2001 From: Milton Miller Date: Fri, 14 Nov 2008 20:11:49 +0000 Subject: powerpc: Provide a separate handler for each IPI action With the new generic smp call function helpers, I noticed the code in smp_message_recv was a single function call in many cases. While getting the message number from the ipi data is easy, we can reduce the path length by a function and data-dependent switch by registering seperate IPI actions for these simple calls. Originally I left the ipi action array exposed, but then I realized the registration code should be common too. The three users each had their own name array, so I made a fourth to convert all users to use a common one. Signed-off-by: Milton Miller Signed-off-by: Paul Mackerras --- arch/powerpc/include/asm/smp.h | 7 +++++ arch/powerpc/kernel/smp.c | 59 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 66 insertions(+) diff --git a/arch/powerpc/include/asm/smp.h b/arch/powerpc/include/asm/smp.h index 1866cec4f96..c25f73d1d84 100644 --- a/arch/powerpc/include/asm/smp.h +++ b/arch/powerpc/include/asm/smp.h @@ -81,6 +81,13 @@ extern int cpu_to_core_id(int cpu); #define PPC_MSG_CALL_FUNC_SINGLE 2 #define PPC_MSG_DEBUGGER_BREAK 3 +/* + * irq controllers that have dedicated ipis per message and don't + * need additional code in the action handler may use this + */ +extern int smp_request_message_ipi(int virq, int message); +extern const char *smp_ipi_name[]; + void smp_init_iSeries(void); void smp_init_pSeries(void); void smp_init_cell(void); diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c index ff9f7010097..a59d8d72bb9 100644 --- a/arch/powerpc/kernel/smp.c +++ b/arch/powerpc/kernel/smp.c @@ -123,6 +123,65 @@ void smp_message_recv(int msg) } } +static irqreturn_t call_function_action(int irq, void *data) +{ + generic_smp_call_function_interrupt(); + return IRQ_HANDLED; +} + +static irqreturn_t reschedule_action(int irq, void *data) +{ + /* we just need the return path side effect of checking need_resched */ + return IRQ_HANDLED; +} + +static irqreturn_t call_function_single_action(int irq, void *data) +{ + generic_smp_call_function_single_interrupt(); + return IRQ_HANDLED; +} + +static irqreturn_t debug_ipi_action(int irq, void *data) +{ + smp_message_recv(PPC_MSG_DEBUGGER_BREAK); + return IRQ_HANDLED; +} + +static irq_handler_t smp_ipi_action[] = { + [PPC_MSG_CALL_FUNCTION] = call_function_action, + [PPC_MSG_RESCHEDULE] = reschedule_action, + [PPC_MSG_CALL_FUNC_SINGLE] = call_function_single_action, + [PPC_MSG_DEBUGGER_BREAK] = debug_ipi_action, +}; + +const char *smp_ipi_name[] = { + [PPC_MSG_CALL_FUNCTION] = "ipi call function", + [PPC_MSG_RESCHEDULE] = "ipi reschedule", + [PPC_MSG_CALL_FUNC_SINGLE] = "ipi call function single", + [PPC_MSG_DEBUGGER_BREAK] = "ipi debugger", +}; + +/* optional function to request ipi, for controllers with >= 4 ipis */ +int smp_request_message_ipi(int virq, int msg) +{ + int err; + + if (msg < 0 || msg > PPC_MSG_DEBUGGER_BREAK) { + return -EINVAL; + } +#if !defined(CONFIG_DEBUGGER) && !defined(CONFIG_KEXEC) + if (msg == PPC_MSG_DEBUGGER_BREAK) { + return 1; + } +#endif + err = request_irq(virq, smp_ipi_action[msg], IRQF_DISABLED|IRQF_PERCPU, + smp_ipi_name[msg], 0); + WARN(err < 0, "unable to request_irq %d for %s (rc %d)\n", + virq, smp_ipi_name[msg], err); + + return err; +} + void smp_send_reschedule(int cpu) { if (likely(smp_ops)) -- cgit v1.2.3