linux-kernel - [PATCH v7 02/13] x86/apic: Prepare for unifying the interrupt delivery modes setup

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1500011554-9784-3-git-send-email-douly.fnst@cn.fujitsu.com>
Date:   Fri, 14 Jul 2017 13:52:23 +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>, <peterz@...radead.org>,
        <izumi.taku@...fujitsu.com>, <tokunaga.keiich@...fujitsu.com>,
        Dou Liyang <douly.fnst@...fujitsu.com>
Subject: [PATCH v7 02/13] x86/apic: Prepare for unifying the interrupt delivery modes setup

There are three positions for initializing the interrupt delivery
modes:

1) In IRQ initial function, may setup the through-local-APIC
   virtual wire mode.

2) In an SMP-capable system, will try to switch to symmetric I/O
   model when preparing the cpus in native_smp_prepare_cpus().

3) In UP system with UP_LATE_INIT=y, will set up local APIC and
   I/O APIC in smp_init().

Switching to symmetric I/O mode is so late, which causes kernel
in an unmatched mode at the beginning of booting time. And it
causes the dump-capture kernel hangs with 'notsc' option inherited
from 1st kernel option.

Provide a new function to unify that three positions. Preparatory
patch to initialize an interrupt mode directly.

Signed-off-by: Dou Liyang <douly.fnst@...fujitsu.com>
---
 arch/x86/include/asm/apic.h |  2 ++
 arch/x86/kernel/apic/apic.c | 16 ++++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index 5f01671..1a970f5 100644
--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -128,6 +128,7 @@ extern void disable_local_APIC(void);
 extern void lapic_shutdown(void);
 extern void sync_Arb_IDs(void);
 extern void init_bsp_APIC(void);
+extern void apic_intr_mode_init(void);
 extern void setup_local_APIC(void);
 extern void init_apic_mappings(void);
 void register_lapic_address(unsigned long address);
@@ -170,6 +171,7 @@ 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_intr_mode_init(void) { }
 #endif /* !CONFIG_X86_LOCAL_APIC */
 
 #ifdef CONFIG_X86_X2APIC
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 01bde03..1a4cc54 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -1343,6 +1343,22 @@ void __init init_bsp_APIC(void)
 	apic_write(APIC_LVT1, value);
 }
 
+/* Init the interrupt delivery mode for the BSP */
+void __init apic_intr_mode_init(void)
+{
+	switch (apic_intr_mode_select()) {
+	case APIC_PIC:
+		pr_info("APIC: keep in PIC mode(8259)\n");
+		return;
+	case APIC_VIRTUAL_WIRE:
+		pr_info("APIC: switch to virtual wire mode setup\n");
+		return;
+	case APIC_SYMMETRIC_IO:
+		pr_info("APIC: switch to symmectic I/O mode setup\n");
+		return;
+	}
+}
+
 static void lapic_setup_esr(void)
 {
 	unsigned int oldvalue, value, maxlvt;
-- 
2.5.5