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| author | Thomas Gleixner <tglx@linutronix.de> | 2019-07-22 20:47:30 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2019-07-25 16:12:02 +0200 |
| commit | 43931d350f30c6cd8c2f498d54ef7d65750abc92 (patch) | |
| tree | 47f3517ac4272325325b2f1d474dd2a270c12bd3 /arch/x86/kernel/apic/x2apic_phys.c | |
| parent | 2510d09e9dabc265341f164e0b45b2dfdcb7ef36 (diff) | |
| download | lwn-43931d350f30c6cd8c2f498d54ef7d65750abc92.tar.gz lwn-43931d350f30c6cd8c2f498d54ef7d65750abc92.zip | |
x86/apic/x2apic: Implement IPI shorthands support
All callers of apic->send_IPI_all() and apic->send_IPI_allbutself() contain
the decision logic for shorthand invocation already and invoke
send_IPI_mask() if the prereqisites are not satisfied.
Implement shorthand support for x2apic.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20190722105221.134696837@linutronix.de
Diffstat (limited to 'arch/x86/kernel/apic/x2apic_phys.c')
| -rw-r--r-- | arch/x86/kernel/apic/x2apic_phys.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/arch/x86/kernel/apic/x2apic_phys.c b/arch/x86/kernel/apic/x2apic_phys.c index 5d50e1f9d4bf..bc9693841353 100644 --- a/arch/x86/kernel/apic/x2apic_phys.c +++ b/arch/x86/kernel/apic/x2apic_phys.c @@ -75,12 +75,12 @@ static void static void x2apic_send_IPI_allbutself(int vector) { - __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLBUT); + __x2apic_send_IPI_shorthand(vector, APIC_DEST_ALLBUT); } static void x2apic_send_IPI_all(int vector) { - __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLINC); + __x2apic_send_IPI_shorthand(vector, APIC_DEST_ALLINC); } static void init_x2apic_ldr(void) @@ -112,6 +112,14 @@ void __x2apic_send_IPI_dest(unsigned int apicid, int vector, unsigned int dest) native_x2apic_icr_write(cfg, apicid); } +void __x2apic_send_IPI_shorthand(int vector, u32 which) +{ + unsigned long cfg = __prepare_ICR(which, vector, 0); + + x2apic_wrmsr_fence(); + native_x2apic_icr_write(cfg, 0); +} + unsigned int x2apic_get_apic_id(unsigned long id) { return id; |