diff options
Diffstat (limited to 'arch/powerpc/platforms/pseries/xics.c')
| -rw-r--r-- | arch/powerpc/platforms/pseries/xics.c | 61 |
1 files changed, 45 insertions, 16 deletions
diff --git a/arch/powerpc/platforms/pseries/xics.c b/arch/powerpc/platforms/pseries/xics.c index c95697912fe..c0cb356833f 100644 --- a/arch/powerpc/platforms/pseries/xics.c +++ b/arch/powerpc/platforms/pseries/xics.c @@ -71,11 +71,6 @@ static unsigned int interrupt_server_size = 8; static struct irq_host *xics_host; -/* - * XICS only has a single IPI, so encode the messages per CPU - */ -struct xics_ipi_struct xics_ipi_message[NR_CPUS] __cacheline_aligned; - /* RTAS service tokens */ static int ibm_get_xive; static int ibm_set_xive; @@ -201,6 +196,15 @@ static void xics_update_irq_servers(void) } #ifdef CONFIG_SMP +/* + * XICS only has a single IPI, so encode the messages per CPU + */ +struct xics_ipi_struct { + unsigned long value; + } ____cacheline_aligned; + +static struct xics_ipi_struct xics_ipi_message[NR_CPUS] __cacheline_aligned; + static int get_irq_server(unsigned int virq, unsigned int strict_check) { int server; @@ -387,7 +391,6 @@ static unsigned int xics_get_irq_lpar(void) } #ifdef CONFIG_SMP - static irqreturn_t xics_ipi_dispatch(int cpu) { WARN_ON(cpu_is_offline(cpu)); @@ -419,6 +422,33 @@ static irqreturn_t xics_ipi_dispatch(int cpu) return IRQ_HANDLED; } +static inline void smp_xics_do_message(int cpu, int msg) +{ + set_bit(msg, &xics_ipi_message[cpu].value); + mb(); + if (firmware_has_feature(FW_FEATURE_LPAR)) + lpar_qirr_info(cpu, IPI_PRIORITY); + else + direct_qirr_info(cpu, IPI_PRIORITY); +} + +void smp_xics_message_pass(int target, int msg) +{ + unsigned int i; + + if (target < NR_CPUS) { + smp_xics_do_message(target, msg); + } else { + for_each_online_cpu(i) { + if (target == MSG_ALL_BUT_SELF + && i == smp_processor_id()) + continue; + smp_xics_do_message(i, msg); + } + } +} + + static irqreturn_t xics_ipi_action_direct(int irq, void *dev_id) { int cpu = smp_processor_id(); @@ -436,15 +466,6 @@ static irqreturn_t xics_ipi_action_lpar(int irq, void *dev_id) return xics_ipi_dispatch(cpu); } - -void xics_cause_IPI(int cpu) -{ - if (firmware_has_feature(FW_FEATURE_LPAR)) - lpar_qirr_info(cpu, IPI_PRIORITY); - else - direct_qirr_info(cpu, IPI_PRIORITY); -} - #endif /* CONFIG_SMP */ static void xics_set_cpu_priority(unsigned char cppr) @@ -697,7 +718,7 @@ void __init xics_init_IRQ(void) #ifdef CONFIG_SMP -void xics_request_IPIs(void) +static void xics_request_ipi(void) { unsigned int ipi; int rc; @@ -718,6 +739,14 @@ void xics_request_IPIs(void) "IPI", NULL); BUG_ON(rc); } + +int __init smp_xics_probe(void) +{ + xics_request_ipi(); + + return cpus_weight(cpu_possible_map); +} + #endif /* CONFIG_SMP */ void xics_teardown_cpu(void) |