[Patch Part2 v3 03/24] x86, irq: Save destination CPU ID in irq_cfg
From: Jiang Liu <hidden>
Date: 2014-10-28 08:24:33
Also in:
linux-acpi, linux-pci, lkml
Subsystem:
the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
Cache destination CPU APIC ID into struct irq_cfg when assigning vector for interrupt. Upper layer just needs to read the cached APIC ID instead of calling apic->cpu_mask_to_apicid_and(), it helps to hide APIC driver details from IOAPIC/HPET/MSI drivers.. Signed-off-by: Jiang Liu <redacted> --- arch/x86/include/asm/hw_irq.h | 1 + arch/x86/kernel/apic/vector.c | 6 ++++++ 2 files changed, 7 insertions(+)
diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h
index 7624fffc2822..3d51d74d6c01 100644
--- a/arch/x86/include/asm/hw_irq.h
+++ b/arch/x86/include/asm/hw_irq.h@@ -116,6 +116,7 @@ struct irq_data; struct irq_cfg { cpumask_var_t domain; cpumask_var_t old_domain; + unsigned int dest_apicid; u8 vector; u8 move_in_progress : 1; #ifdef CONFIG_IRQ_REMAP
diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
index 5ac840a4cc53..02cb5d386985 100644
--- a/arch/x86/kernel/apic/vector.c
+++ b/arch/x86/kernel/apic/vector.c@@ -188,6 +188,12 @@ next: } free_cpumask_var(tmp_mask); + if (!err) { + /* cache destination APIC IDs into cfg->dest_apicid */ + err = apic->cpu_mask_to_apicid_and(mask, cfg->domain, + &cfg->dest_apicid); + } + return err; }
--
1.7.10.4