diff options
Diffstat (limited to 'arch/x86/kernel/apic/ipi.c')
| -rw-r--r-- | arch/x86/kernel/apic/ipi.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/arch/x86/kernel/apic/ipi.c b/arch/x86/kernel/apic/ipi.c index e0e05673a4f4..460df029e511 100644 --- a/arch/x86/kernel/apic/ipi.c +++ b/arch/x86/kernel/apic/ipi.c @@ -1,7 +1,9 @@ // SPDX-License-Identifier: GPL-2.0 #include <linux/cpumask.h> +#include <linux/delay.h> #include <linux/smp.h> + #include <asm/io_apic.h> #include "local.h" @@ -102,6 +104,19 @@ static inline int __prepare_ICR2(unsigned int mask) return SET_XAPIC_DEST_FIELD(mask); } +u32 apic_mem_wait_icr_idle_timeout(void) +{ + int cnt; + + for (cnt = 0; cnt < 1000; cnt++) { + if (!(apic_read(APIC_ICR) & APIC_ICR_BUSY)) + return 0; + inc_irq_stat(icr_read_retry_count); + udelay(100); + } + return APIC_ICR_BUSY; +} + void apic_mem_wait_icr_idle(void) { while (native_apic_mem_read(APIC_ICR) & APIC_ICR_BUSY) @@ -135,7 +150,7 @@ static void __default_send_IPI_shortcut(unsigned int shortcut, int vector) * to stop the others before launching the kdump kernel. */ if (unlikely(vector == NMI_VECTOR)) - safe_apic_wait_icr_idle(); + apic_mem_wait_icr_idle_timeout(); else apic_mem_wait_icr_idle(); @@ -152,7 +167,7 @@ void __default_send_IPI_dest_field(unsigned int dest_mask, int vector, { /* See comment in __default_send_IPI_shortcut() */ if (unlikely(vector == NMI_VECTOR)) - safe_apic_wait_icr_idle(); + apic_mem_wait_icr_idle_timeout(); else apic_mem_wait_icr_idle(); |