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[PATCH] x86-64: Try multiple timer variants in check_timer

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Instead of adding all kinds of more quirks try various timer
routing variants in check_timer.

In particular this tries to handle quirks from:
- Nvidia NF2-4 reference BIOS: wrong timer override
- Asus: Wrong timer override but no HPET table
- ATI: require timer disabled in 8259
- Some boards: require timer enabled in 8259

We just try many of the the known variants in the hopefully right order
in check_timer.

Trying pin 0/2 on Nvidia suggested by Tim Hockin.

TBD Experimental. Needs a lot of testing

Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Andi Kleen 2006-12-07 02:14:06 +01:00 committed by Andi Kleen
parent 11a4180c0b
commit b026872601
3 changed files with 51 additions and 82 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/x86_64/boot-options.txt
View File

@ -52,10 +52,6 @@ APICs
apicmaintimer. Useful when your PIT timer is totally
broken.
disable_8254_timer / enable_8254_timer
Enable interrupt 0 timer routing over the 8254 in addition to over
the IO-APIC. The kernel tries to set a sensible default.
Early Console
syntax: earlyprintk=vga

5
arch/x86_64/kernel/early-quirks.c
View File

@ -69,11 +69,6 @@ static void nvidia_bugs(void)
static void ati_bugs(void)
{
if (timer_over_8254 == 1) {
timer_over_8254 = 0;
printk(KERN_INFO
"ATI board detected. Disabling timer routing over 8254.\n");
}
}
struct chipset {

124
arch/x86_64/kernel/io_apic.c
View File

@ -55,10 +55,6 @@ int sis_apic_bug; /* not actually supported, dummy for compile */
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 };
@ -348,29 +344,6 @@ static int __init disable_ioapic_setup(char *str)
}
early_param("noapic", disable_ioapic_setup);
/* Actually the next is obsolete, but keep it for paranoid reasons -AK */
static int __init disable_timer_pin_setup(char *arg)
{
disable_timer_pin_1 = 1;
return 1;
}
__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.
*/
@ -1579,10 +1552,33 @@ static inline void unlock_ExtINT_logic(void)
* a wide range of boards and BIOS bugs. Fortunately only the timer IRQ
* is so screwy. Thanks to Brian Perkins for testing/hacking this beast
* fanatically on his truly buggy board.
*
* FIXME: really need to revamp this for modern platforms only.
*/
static inline void check_timer(void)
static int try_apic_pin(int apic, int pin, char *msg)
{
apic_printk(APIC_VERBOSE, KERN_INFO
"..TIMER: trying IO-APIC=%d PIN=%d %s",
apic, pin, msg);
/*
* Ok, does IRQ0 through the IOAPIC work?
*/
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);
}
return 1;
}
clear_IO_APIC_pin(apic, pin);
apic_printk(APIC_QUIET, KERN_ERR " .. failed\n");
return 0;
}
/* The function from hell */
static void check_timer(void)
{
int apic1, pin1, apic2, pin2;
int vector;
@ -1603,61 +1599,43 @@ static inline void 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);
pin2 = ioapic_i8259.pin;
apic2 = ioapic_i8259.apic;
apic_printk(APIC_VERBOSE,KERN_INFO "..TIMER: vector=0x%02X apic1=%d pin1=%d apic2=%d pin2=%d\n",
vector, apic1, pin1, apic2, pin2);
/* Do this first, otherwise we get double interrupts on ATI boards */
if ((pin1 != -1) && try_apic_pin(apic1, pin1,"with 8259 IRQ0 disabled"))
return;
if (pin1 != -1) {
/*
* Ok, does IRQ0 through the IOAPIC work?
*/
unmask_IO_APIC_irq(0);
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);
}
if (disable_timer_pin_1 > 0)
clear_IO_APIC_pin(0, pin1);
return;
}
clear_IO_APIC_pin(apic1, pin1);
apic_printk(APIC_QUIET,KERN_ERR "..MP-BIOS bug: 8254 timer not "
"connected to IO-APIC\n");
}
/* Now try again with IRQ0 8259A enabled.
Assumes timer is on IO-APIC 0 ?!? */
enable_8259A_irq(0);
unmask_IO_APIC_irq(0);
if (try_apic_pin(apic1, pin1, "with 8259 IRQ0 enabled"))
return;
disable_8259A_irq(0);
apic_printk(APIC_VERBOSE,KERN_INFO "...trying to set up timer (IRQ0) "
"through the 8259A ... ");
/* Always try pin0 and pin2 on APIC 0 to handle buggy timer overrides
on Nvidia boards */
if (!(apic1 == 0 && pin1 == 0) &&
try_apic_pin(0, 0, "fallback with 8259 IRQ0 disabled"))
return;
if (!(apic1 == 0 && pin1 == 2) &&
try_apic_pin(0, 2, "fallback with 8259 IRQ0 disabled"))
return;
/* Then try pure 8259A routing on the 8259 as reported by BIOS*/
enable_8259A_irq(0);
if (pin2 != -1) {
apic_printk(APIC_VERBOSE,"\n..... (found apic %d pin %d) ...",
apic2, pin2);
/*
* legacy devices should be connected to IO APIC #0
*/
setup_ExtINT_IRQ0_pin(apic2, pin2, vector);
if (timer_irq_works()) {
apic_printk(APIC_VERBOSE," works.\n");
nmi_watchdog_default();
if (nmi_watchdog == NMI_IO_APIC) {
setup_nmi();
}
if (try_apic_pin(apic2,pin2,"8259A broadcast ExtINT from BIOS"))
return;
}
/*
* Cleanup, just in case ...
*/
clear_IO_APIC_pin(apic2, pin2);
}
apic_printk(APIC_VERBOSE," failed.\n");
/* Tried all possibilities to go through the IO-APIC. Now come the
really cheesy fallbacks. */
if (nmi_watchdog == NMI_IO_APIC) {
printk(KERN_WARNING "timer doesn't work through the IO-APIC - disabling NMI Watchdog!\n");