From ecd29476ae0143b1c3641edfa76c0fc3e9ad3021 Mon Sep 17 00:00:00 2001 From: "Maciej W. Rozycki" Date: Wed, 21 May 2008 22:09:19 +0100 Subject: [PATCH] x86: I/O APIC: remove parameters to fiddle with the 8259A Remove the "disable_8254_timer" and "enable_8254_timer" kernel parameters. Now that AEOI acknowledgements are no longer needed for correct timer operation, the 8259A can be kept disabled unconditionally unless interrupts, either timer or watchdog ones, are actually passed through it. Signed-off-by: Maciej W. Rozycki Signed-off-by: Ingo Molnar --- arch/x86/kernel/early-quirks.c | 13 ------------- arch/x86/kernel/io_apic_32.c | 21 ++------------------- arch/x86/kernel/io_apic_64.c | 21 ++------------------- include/asm-x86/apic.h | 1 - 4 files changed, 4 insertions(+), 52 deletions(-) diff --git a/arch/x86/kernel/early-quirks.c b/arch/x86/kernel/early-quirks.c index 9f51e1ea9e82..84fd9f2a28ff 100644 --- a/arch/x86/kernel/early-quirks.c +++ b/arch/x86/kernel/early-quirks.c @@ -98,17 +98,6 @@ static void __init nvidia_bugs(int num, int slot, int func) } -static void __init ati_bugs(int num, int slot, int func) -{ -#ifdef CONFIG_X86_IO_APIC - if (timer_over_8254 == 1) { - timer_over_8254 = 0; - printk(KERN_INFO - "ATI board detected. Disabling timer routing over 8254.\n"); - } -#endif -} - #define QFLAG_APPLY_ONCE 0x1 #define QFLAG_APPLIED 0x2 #define QFLAG_DONE (QFLAG_APPLY_ONCE|QFLAG_APPLIED) @@ -126,8 +115,6 @@ static struct chipset early_qrk[] __initdata = { PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, nvidia_bugs }, { PCI_VENDOR_ID_VIA, PCI_ANY_ID, PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, via_bugs }, - { PCI_VENDOR_ID_ATI, PCI_ANY_ID, - PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, ati_bugs }, { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB, PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, fix_hypertransport_config }, {} diff --git a/arch/x86/kernel/io_apic_32.c b/arch/x86/kernel/io_apic_32.c index c64b3f5cc121..61cf366d040f 100644 --- a/arch/x86/kernel/io_apic_32.c +++ b/arch/x86/kernel/io_apic_32.c @@ -58,7 +58,6 @@ static struct { int pin, apic; } ioapic_i8259 = { -1, -1 }; static DEFINE_SPINLOCK(ioapic_lock); static DEFINE_SPINLOCK(vector_lock); -int timer_over_8254 __initdata = 1; /* * Is the SiS APIC rmw bug present ? @@ -2157,8 +2156,6 @@ static inline void __init check_timer(void) apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT); init_8259A(1); timer_ack = (nmi_watchdog == NMI_IO_APIC && !APIC_INTEGRATED(ver)); - if (timer_over_8254 > 0) - enable_8259A_irq(0); pin1 = find_isa_irq_pin(0, mp_INT); apic1 = find_isa_irq_apic(0, mp_INT); @@ -2175,7 +2172,6 @@ static inline void __init check_timer(void) unmask_IO_APIC_irq(0); if (timer_irq_works()) { if (nmi_watchdog == NMI_IO_APIC) { - disable_8259A_irq(0); setup_nmi(); enable_8259A_irq(0); } @@ -2195,6 +2191,7 @@ static inline void __init check_timer(void) * legacy devices should be connected to IO APIC #0 */ setup_ExtINT_IRQ0_pin(apic2, pin2, vector); + enable_8259A_irq(0); if (timer_irq_works()) { printk("works.\n"); if (pin1 != -1) @@ -2209,6 +2206,7 @@ static inline void __init check_timer(void) /* * Cleanup, just in case ... */ + disable_8259A_irq(0); clear_IO_APIC_pin(apic2, pin2); } printk(" failed.\n"); @@ -2221,7 +2219,6 @@ static inline void __init check_timer(void) printk(KERN_INFO "...trying to set up timer as Virtual Wire IRQ..."); - disable_8259A_irq(0); set_irq_chip_and_handler_name(0, &lapic_chip, handle_fasteoi_irq, "fasteoi"); apic_write_around(APIC_LVT0, APIC_DM_FIXED | vector); /* Fixed mode */ @@ -2292,20 +2289,6 @@ void __init setup_IO_APIC(void) print_IO_APIC(); } -static int __init setup_disable_8254_timer(char *s) -{ - timer_over_8254 = -1; - return 1; -} -static int __init setup_enable_8254_timer(char *s) -{ - timer_over_8254 = 2; - return 1; -} - -__setup("disable_8254_timer", setup_disable_8254_timer); -__setup("enable_8254_timer", setup_enable_8254_timer); - /* * Called after all the initialization is done. If we didnt find any * APIC bugs then we can allow the modify fast path diff --git a/arch/x86/kernel/io_apic_64.c b/arch/x86/kernel/io_apic_64.c index 7c34e38e4219..9f16ca4b5a24 100644 --- a/arch/x86/kernel/io_apic_64.c +++ b/arch/x86/kernel/io_apic_64.c @@ -90,7 +90,6 @@ static int no_timer_check; static int disable_timer_pin_1 __initdata; -int timer_over_8254 __initdata = 1; /* Where if anywhere is the i8259 connect in external int mode */ static struct { int pin, apic; } ioapic_i8259 = { -1, -1 }; @@ -430,20 +429,6 @@ static int __init disable_timer_pin_setup(char *arg) } __setup("disable_timer_pin_1", disable_timer_pin_setup); -static int __init setup_disable_8254_timer(char *s) -{ - timer_over_8254 = -1; - return 1; -} -static int __init setup_enable_8254_timer(char *s) -{ - timer_over_8254 = 2; - return 1; -} - -__setup("disable_8254_timer", setup_disable_8254_timer); -__setup("enable_8254_timer", setup_enable_8254_timer); - /* * Find the IRQ entry number of a certain pin. @@ -1674,8 +1659,6 @@ static inline void __init check_timer(void) */ apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT); init_8259A(1); - if (timer_over_8254 > 0) - enable_8259A_irq(0); pin1 = find_isa_irq_pin(0, mp_INT); apic1 = find_isa_irq_apic(0, mp_INT); @@ -1693,7 +1676,6 @@ static inline void __init check_timer(void) if (!no_timer_check && timer_irq_works()) { nmi_watchdog_default(); if (nmi_watchdog == NMI_IO_APIC) { - disable_8259A_irq(0); setup_nmi(); enable_8259A_irq(0); } @@ -1715,6 +1697,7 @@ static inline void __init check_timer(void) * legacy devices should be connected to IO APIC #0 */ setup_ExtINT_IRQ0_pin(apic2, pin2, cfg->vector); + enable_8259A_irq(0); if (timer_irq_works()) { apic_printk(APIC_VERBOSE," works.\n"); nmi_watchdog_default(); @@ -1726,6 +1709,7 @@ static inline void __init check_timer(void) /* * Cleanup, just in case ... */ + disable_8259A_irq(0); clear_IO_APIC_pin(apic2, pin2); } apic_printk(APIC_VERBOSE," failed.\n"); @@ -1737,7 +1721,6 @@ static inline void __init check_timer(void) apic_printk(APIC_VERBOSE, KERN_INFO "...trying to set up timer as Virtual Wire IRQ..."); - disable_8259A_irq(0); irq_desc[0].chip = &lapic_irq_type; apic_write(APIC_LVT0, APIC_DM_FIXED | cfg->vector); /* Fixed mode */ enable_8259A_irq(0); diff --git a/include/asm-x86/apic.h b/include/asm-x86/apic.h index be9639a9a186..9c2dfd926e59 100644 --- a/include/asm-x86/apic.h +++ b/include/asm-x86/apic.h @@ -36,7 +36,6 @@ extern void generic_apic_probe(void); #ifdef CONFIG_X86_LOCAL_APIC extern int apic_verbosity; -extern int timer_over_8254; extern int local_apic_timer_c2_ok; extern int local_apic_timer_disabled;