hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

x86, acpi/irq: Generalize mp_config_acpi_legacy_irqs 

Remove the assumption that there is not an override for isa irq 0.
Instead lookup the gsi and from that lookup the ioapic and pin of each
isa irq indivdually.

In general this should not have any behavioural affect but in
perverse cases this gets all of the details correct, instead of
doing something weird.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
LKML-Reference: <1269936436-7039-5-git-send-email-ebiederm@xmission.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Eric W. Biederman 2010-03-30 01:07:06 -07:00 committed by H. Peter Anvin
parent 9d2062b879
commit 0fd52670fb
1 changed files with 18 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
arch/x86/kernel/acpi/boot.c
View File

@ -961,8 +961,6 @@ void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi)
void __init mp_config_acpi_legacy_irqs(void)
{
int i;
int ioapic;
unsigned int dstapic;
struct mpc_intsrc mp_irq;
#if defined (CONFIG_MCA) || defined (CONFIG_EISA)
@ -982,20 +980,28 @@ void __init mp_config_acpi_legacy_irqs(void)
return;
#endif
/*
* Locate the IOAPIC that manages the ISA IRQs (0-15).
*/
ioapic = mp_find_ioapic(0);
if (ioapic < 0)
return;
dstapic = mp_ioapics[ioapic].apicid;
/*
* Use the default configuration for the IRQs 0-15. Unless
* overridden by (MADT) interrupt source override entries.
*/
for (i = 0; i < 16; i++) {
int ioapic, pin;
unsigned int dstapic;
int idx;
u32 gsi;
/* Locate the gsi that irq i maps to. */
if (acpi_isa_irq_to_gsi(i, &gsi))
continue;
/*
* Locate the IOAPIC that manages the ISA IRQ.
*/
ioapic = mp_find_ioapic(gsi);
if (ioapic < 0)
continue;
pin = mp_find_ioapic_pin(ioapic, gsi);
dstapic = mp_ioapics[ioapic].apicid;
for (idx = 0; idx < mp_irq_entries; idx++) {
struct mpc_intsrc *irq = mp_irqs + idx;
@ -1005,7 +1011,7 @@ void __init mp_config_acpi_legacy_irqs(void)
break;
/* Do we already have a mapping for this IOAPIC pin */
if (irq->dstapic == dstapic && irq->dstirq == i)
if (irq->dstapic == dstapic && irq->dstirq == pin)
break;
}
@ -1020,7 +1026,7 @@ void __init mp_config_acpi_legacy_irqs(void)
mp_irq.dstapic = dstapic;
mp_irq.irqtype = mp_INT;
mp_irq.srcbusirq = i; /* Identity mapped */
mp_irq.dstirq = i;
mp_irq.dstirq = pin;
save_mp_irq(&mp_irq);
}