linux-kernel - [RFC PATCH v2 12/12] x86/apic: Remove the apic_virtual_wire_mode

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Date:   Wed, 19 Apr 2017 17:05:26 +0800
From:   Dou Liyang <douly.fnst@...fujitsu.com>
To:     <x86@...nel.org>, <linux-kernel@...r.kernel.org>
CC:     <tglx@...utronix.de>, <mingo@...nel.org>, <hpa@...or.com>,
        <ebiederm@...ssion.com>, <bhe@...hat.com>,
        <izumi.taku@...fujitsu.com>, Dou Liyang <douly.fnst@...fujitsu.com>
Subject: [RFC PATCH v2 12/12] x86/apic: Remove the apic_virtual_wire_mode_setup()

Currently, enable and setup the interrupt mode has been advanced
and it has already included the virtual wire mode setup.

The apic_virtual_wire_mode_setup() which works for the virtual wire
mode is redundant.

Remove the apic_virtual_wire_mode_setup() function and add the apic
routing setup for the virtual wire mode.

Signed-off-by: Dou Liyang <douly.fnst@...fujitsu.com>
---
 arch/x86/include/asm/apic.h |  2 --
 arch/x86/kernel/apic/apic.c | 50 +--------------------------------------------
 arch/x86/kernel/irqinit.c   |  2 --
 3 files changed, 1 insertion(+), 53 deletions(-)

diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index b0b2cf0..6d643de 100644
--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -136,7 +136,6 @@ extern void disconnect_bsp_APIC(int virt_wire_setup);
 extern void disable_local_APIC(void);
 extern void lapic_shutdown(void);
 extern void sync_Arb_IDs(void);
-extern void apic_virtual_wire_mode_setup(void);
 extern void init_interrupt_mode(void);
 extern void setup_local_APIC(void);
 extern void init_apic_mappings(void);
@@ -180,7 +179,6 @@ static inline void disable_local_APIC(void) { }
 # define setup_boot_APIC_clock x86_init_noop
 # define setup_secondary_APIC_clock x86_init_noop
 static inline void lapic_update_tsc_freq(void) { }
-static inline void apic_virtual_wire_mode_setup(void) {}
 static inline void init_interrupt_mode(void) {}
 #endif /* !CONFIG_X86_LOCAL_APIC */
 
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index f259daa..8454226 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -1225,55 +1225,6 @@ static int __init apic_bsp_mode_check(int *upmode)
 
 }
 
-/*
- * Setup the through-local-APIC virtual wire mode.
- */
-void __init apic_virtual_wire_mode_setup(void)
-{
-	unsigned int value;
-
-	/*
-	 * Don't do the setup now if we have a SMP BIOS as the
-	 * through-I/O-APIC virtual wire mode might be active.
-	 */
-	if (smp_found_config || !boot_cpu_has(X86_FEATURE_APIC))
-		return;
-
-	/*
-	 * Do not trust the local APIC being empty at bootup.
-	 */
-	clear_local_APIC();
-
-	/*
-	 * Enable APIC.
-	 */
-	value = apic_read(APIC_SPIV);
-	value &= ~APIC_VECTOR_MASK;
-	value |= APIC_SPIV_APIC_ENABLED;
-
-#ifdef CONFIG_X86_32
-	/* This bit is reserved on P4/Xeon and should be cleared */
-	if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
-	    (boot_cpu_data.x86 == 15))
-		value &= ~APIC_SPIV_FOCUS_DISABLED;
-	else
-#endif
-		value |= APIC_SPIV_FOCUS_DISABLED;
-	value |= SPURIOUS_APIC_VECTOR;
-	apic_write(APIC_SPIV, value);
-
-	/*
-	 * Set up the virtual wire mode.
-	 */
-	apic_write(APIC_LVT0, APIC_DM_EXTINT);
-	value = APIC_DM_NMI;
-	if (!lapic_is_integrated())		/* 82489DX */
-		value |= APIC_LVT_LEVEL_TRIGGER;
-	if (apic_extnmi == APIC_EXTNMI_NONE)
-		value |= APIC_LVT_MASKED;
-	apic_write(APIC_LVT1, value);
-}
-
 /* Init the interrupt delivery mode for the BSP */
 void __init init_interrupt_mode(void)
 {
@@ -1286,6 +1237,7 @@ void __init init_interrupt_mode(void)
 		return;
 	case APIC_VIRTUAL_WIRE:
 		pr_info("Switch to virtual wire mode\n");
+		default_setup_apic_routing();
 		break;
 	case APIC_SYMMETRIC_IO:
 		pr_info("Switch to symmectic I/O mode\n");
diff --git a/arch/x86/kernel/irqinit.c b/arch/x86/kernel/irqinit.c
index 25ddd7c..a8c0de6 100644
--- a/arch/x86/kernel/irqinit.c
+++ b/arch/x86/kernel/irqinit.c
@@ -72,8 +72,6 @@ void __init init_ISA_irqs(void)
 	struct irq_chip *chip = legacy_pic->chip;
 	int i;
 
-	apic_virtual_wire_mode_setup();
-
 	legacy_pic->init(0);
 
 	for (i = 0; i < nr_legacy_irqs(); i++)
-- 
2.5.5