q3k
/
linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
linux/arch
History
Yinghai Lu b9e0353fc8 x86/acpi: remove irq-compression trick on 32-bit 
We already have a per cpu vector on 32-bit via recent changes, and
don't need this trick any more (which trick obfuscates the real GSI
mappings and which only triggers on larger systems to begin with):

On 3 ioapic system (24 per ioapic) before patch I got:

ACPI: PCI Interrupt Link [ILSB] enabled at IRQ 71
IOAPIC[2]: Set routing entry (10-23 -> 0xa9 -> IRQ 64 Mode:1 Active:1)
pci 0000:80:01.1: PCI INT A -> Link[ILSB] -> GSI 71 (level, low) -> IRQ 64
ACPI: PCI Interrupt Link [LE5B] enabled at IRQ 67
IOAPIC[2]: Set routing entry (10-19 -> 0xb1 -> IRQ 65 Mode:1 Active:1)
pci 0000:83:00.0: PCI INT B -> Link[LE5B] -> GSI 67 (level, low) -> IRQ 65
ACPI: PCI Interrupt Link [LE5A] enabled at IRQ 66
IOAPIC[2]: Set routing entry (10-18 -> 0xb9 -> IRQ 66 Mode:1 Active:1)
pci 0000:83:00.1: PCI INT A -> Link[LE5A] -> GSI 66 (level, low) -> IRQ 66
ACPI: PCI Interrupt Link [LE5D] enabled at IRQ 65
IOAPIC[2]: Set routing entry (10-17 -> 0xc1 -> IRQ 67 Mode:1 Active:1)
pci 0000:84:00.0: PCI INT B -> Link[LE5D] -> GSI 65 (level, low) -> IRQ 67
ACPI: PCI Interrupt Link [LE5C] enabled at IRQ 64
IOAPIC[2]: Set routing entry (10-16 -> 0xc9 -> IRQ 68 Mode:1 Active:1)
pci 0000:84:00.1: PCI INT A -> Link[LE5C] -> GSI 64 (level, low) -> IRQ 68
pci 0000:87:00.0: PCI INT B -> Link[LE5A] -> GSI 66 (level, low) -> IRQ 66
pci 0000:87:00.1: PCI INT A -> Link[LE5D] -> GSI 65 (level, low) -> IRQ 67
pci 0000:88:00.0: PCI INT B -> Link[LE5C] -> GSI 64 (level, low) -> IRQ 68
pci 0000:88:00.1: PCI INT A -> Link[LE5B] -> GSI 67 (level, low) -> IRQ 65
pci 0000:8b:00.0: PCI INT B -> Link[LE5A] -> GSI 66 (level, low) -> IRQ 66
pci 0000:8b:00.1: PCI INT A -> Link[LE5D] -> GSI 65 (level, low) -> IRQ 67
pci 0000:8c:00.0: PCI INT B -> Link[LE5C] -> GSI 64 (level, low) -> IRQ 68
pci 0000:8c:00.1: PCI INT A -> Link[LE5B] -> GSI 67 (level, low) -> IRQ 65

after the patch we get:

ACPI: PCI Interrupt Link [ILSB] enabled at IRQ 71
IOAPIC[2]: Set routing entry (10-23 -> 0xa9 -> IRQ 71 Mode:1 Active:1)
pci 0000:80:01.1: PCI INT A -> Link[ILSB] -> GSI 71 (level, low) -> IRQ 71
ACPI: PCI Interrupt Link [LE5B] enabled at IRQ 67
IOAPIC[2]: Set routing entry (10-19 -> 0xb1 -> IRQ 67 Mode:1 Active:1)
pci 0000:83:00.0: PCI INT B -> Link[LE5B] -> GSI 67 (level, low) -> IRQ 67
ACPI: PCI Interrupt Link [LE5A] enabled at IRQ 66
IOAPIC[2]: Set routing entry (10-18 -> 0xb9 -> IRQ 66 Mode:1 Active:1)
pci 0000:83:00.1: PCI INT A -> Link[LE5A] -> GSI 66 (level, low) -> IRQ 66
ACPI: PCI Interrupt Link [LE5D] enabled at IRQ 65
IOAPIC[2]: Set routing entry (10-17 -> 0xc1 -> IRQ 65 Mode:1 Active:1)
pci 0000:84:00.0: PCI INT B -> Link[LE5D] -> GSI 65 (level, low) -> IRQ 65
ACPI: PCI Interrupt Link [LE5C] enabled at IRQ 64
IOAPIC[2]: Set routing entry (10-16 -> 0xc9 -> IRQ 64 Mode:1 Active:1)
pci 0000:84:00.1: PCI INT A -> Link[LE5C] -> GSI 64 (level, low) -> IRQ 64
pci 0000:87:00.0: PCI INT B -> Link[LE5A] -> GSI 66 (level, low) -> IRQ 66
pci 0000:87:00.1: PCI INT A -> Link[LE5D] -> GSI 65 (level, low) -> IRQ 65
pci 0000:88:00.0: PCI INT B -> Link[LE5C] -> GSI 64 (level, low) -> IRQ 64
pci 0000:88:00.1: PCI INT A -> Link[LE5B] -> GSI 67 (level, low) -> IRQ 67
pci 0000:8b:00.0: PCI INT B -> Link[LE5A] -> GSI 66 (level, low) -> IRQ 66
pci 0000:8b:00.1: PCI INT A -> Link[LE5D] -> GSI 65 (level, low) -> IRQ 65
pci 0000:8c:00.0: PCI INT B -> Link[LE5C] -> GSI 64 (level, low) -> IRQ 64
pci 0000:8c:00.1: PCI INT A -> Link[LE5B] -> GSI 67 (level, low) -> IRQ 67

As it can be seen that GSIs now get mapped lineary.

[ Impact: simplify irq number mapping on bigger 32-bit systems ]

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Len Brown <lenb@kernel.org>
LKML-Reference: <4A01C35C.7060207@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
 		2009-05-11 10:35:06 +02:00
..
alpha irq: change ->set_affinity() to return status 2009-04-28 12:21:16 +02:00
arm irq: change ->set_affinity() to return status 2009-04-28 12:21:16 +02:00
avr32 clocksource: pass clocksource to read() callback 2009-04-21 13:41:47 -07:00
blackfin clocksource: pass clocksource to read() callback 2009-04-21 13:41:47 -07:00
cris irq: change ->set_affinity() to return status 2009-04-28 12:21:16 +02:00
frv FRV: Stop gcc from generating uninitialised variable warnings after BUG() 2009-04-27 08:04:49 -07:00
h8300 Get rid of final remnants of include/asm-$(ARCH) 2009-04-17 09:59:27 -07:00
ia64 irq: change ACPI GSI APIs to also take a device argument 2009-04-28 12:21:17 +02:00
m32r m32r: convert to use __HEAD and HEAD_TEXT macros. 2009-04-26 09:20:38 -07:00
m68k m68k: convert to use __HEAD and HEAD_TEXT macros. 2009-04-26 09:20:38 -07:00
m68knommu Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu 2009-04-24 08:45:53 -07:00
microblaze microblaze: add parameter to microblaze_read() 2009-04-23 16:27:38 +02:00
mips irq: change ->set_affinity() to return status 2009-04-28 12:21:16 +02:00
mn10300 mn10300: convert to use __HEAD and HEAD_TEXT macros. 2009-04-26 09:20:38 -07:00
parisc irq: change ->set_affinity() to return status 2009-04-28 12:21:16 +02:00
powerpc irq: change ->set_affinity() to return status, fix 2009-05-06 07:55:33 +02:00
s390 s390: convert to use __HEAD and HEAD_TEXT macros. 2009-04-26 09:20:39 -07:00
sh sh: Fix up unsigned syscall_nr in SH-5 pt_regs. 2009-04-27 17:05:38 +09:00
sparc irq: change ->set_affinity() to return status 2009-04-28 12:21:16 +02:00
um uml: kill a kconfig warning 2009-04-21 13:41:50 -07:00
x86 x86/acpi: remove irq-compression trick on 32-bit 2009-05-11 10:35:06 +02:00
xtensa xtensa: convert to use __HEAD and HEAD_TEXT macros. 2009-04-26 09:20:38 -07:00
.gitignore
…
Kconfig mutex: have non-spinning mutexes on s390 by default 2009-04-09 19:28:24 +02:00