On 10/12/2007 03:04 AM, Zhao Yakui wrote: > Hi, All > The BIOS of some systems using NVIDIA chipset gives the uncorrect > timer override connection, which will cause that I/O APIC and timer > can't be connected and kernel panic. > There are two ways to fix this bug. One is to use the following patch and > the other is to add a new boot option of acpi_force_timer_override. > > 1. Use the following patch. > The basic flowchart of patch is that:(unnecessary to add new boot option) > a. When NVIDIA chipset is detected and hpet timer exist, > acpi_use_timer_override will be set. > (Skip this when boot option of acpi_use_timer_override is given). > b. Check whether uncorrect timer connection(IRQ0, Pin0) exists when > acpi_use_timer_override is set and HPET timer exists. > If error exists, timer will be forced to route to the Pin2. > > 2. Add a new boot option of acpi_force_timer_override > The basic flowchart of this method is that: > a. When NVIDIA chipset is detected and HPET timer exists, > acpi_force_timer_override will be set. > (skip this when boot option of acpi_force_timer_override is given) > b. Check whether uncorrect timer connection(IRQ0,Pin0) exists when > acpi_force_timer_override is set. > If the error exists, modify the timer override connection. > > Welcome the comments. > Thanks. > > Subject: ACPI :Modify timer override connection in Some NVIDIA systems >>From : Zhao Yakui <[EMAIL PROTECTED]> > > BIOS defines the uncorrect timeroverride connection in some NVIDIA > systems > on which HPET timer exists. When the uncorrect connection is deteced, > the timer will be forced to route to the Pin 2 of I/O APIC instead of > Pin 0. > > http://bugzilla.kernel.org/show_bug.cgi?id=8956 > > Signed-off-by: Zhao Yakui <[EMAIL PROTECTED]> > --- > arch/i386/kernel/acpi/boot.c | 17 +++++++++++++++++ > arch/i386/kernel/acpi/earlyquirk.c | 7 ++++++- > arch/x86_64/kernel/early-quirks.c | 2 ++ > 3 files changed, 25 insertions(+), 1 deletion(-) > > Index: linux-2.6.23-rc9/arch/i386/kernel/acpi/boot.c > =================================================================== > --- linux-2.6.23-rc9.orig/arch/i386/kernel/acpi/boot.c > +++ linux-2.6.23-rc9/arch/i386/kernel/acpi/boot.c > @@ -351,6 +351,11 @@ static void __init acpi_sci_ioapic_setup > return; > } > > +static int __init acpi_hpet_check(struct acpi_table_header *header) > +{ > + return 0; > +} > + > static int __init > acpi_parse_int_src_ovr(struct acpi_subtable_header * header, > const unsigned long end) > @@ -371,6 +376,18 @@ acpi_parse_int_src_ovr(struct acpi_subta > return 0; > } > > + if (acpi_use_timer_override && > + intsrc->source_irq == 0 && intsrc->global_irq == 0 && > + !acpi_table_parse(ACPI_SIG_HPET, acpi_hpet_check)) { > + mp_override_legacy_irq(intsrc->source_irq, > + intsrc->inti_flags & ACPI_MADT_POLARITY_MASK, > + (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2, > + 2); > + printk(PREFIX "BIOS IRQ0 pin0 override ignored." > + "Force to use IRQ0 pin2 \n"); > + return 0; > + } > + > if (acpi_skip_timer_override && > intsrc->source_irq == 0 && intsrc->global_irq == 2) { > printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n"); > Index: linux-2.6.23-rc9/arch/i386/kernel/acpi/earlyquirk.c > =================================================================== > --- linux-2.6.23-rc9.orig/arch/i386/kernel/acpi/earlyquirk.c > +++ linux-2.6.23-rc9/arch/i386/kernel/acpi/earlyquirk.c > @@ -26,7 +26,8 @@ static int __init check_bridge(int vendo > /* According to Nvidia all timer overrides are bogus unless HPET > is enabled. */ > if (!acpi_use_timer_override && vendor == PCI_VENDOR_ID_NVIDIA) { > - if (!warned && acpi_table_parse(ACPI_SIG_HPET, > + if (!warned) { > + if (acpi_table_parse(ACPI_SIG_HPET, > nvidia_hpet_check)) { > warned = 1; > acpi_skip_timer_override = 1; > @@ -36,6 +37,10 @@ static int __init check_bridge(int vendo > printk(KERN_INFO "If you got timer trouble " > "try acpi_use_timer_override\n"); > > + } else { > + warned = 1; > + acpi_use_timer_override = 1; > + } > } > } > #endif > Index: linux-2.6.23-rc9/arch/x86_64/kernel/early-quirks.c > =================================================================== > --- linux-2.6.23-rc9.orig/arch/x86_64/kernel/early-quirks.c > +++ linux-2.6.23-rc9/arch/x86_64/kernel/early-quirks.c > @@ -57,6 +57,8 @@ static void __init nvidia_bugs(void) > "timer override.\n"); > printk(KERN_INFO "If you got timer trouble " > "try acpi_use_timer_override\n"); > + } else { > + acpi_use_timer_override = 1; > } > #endif > /* RED-PEN skip them on mptables too? */
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