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Date: Tue, 18 Mar 2008 22:48:22 +0300
From: Alexey Starikovskiy <astarikovskiy@...e.de>
To: Tim Elliott <tle@...ymonkey.com>
CC: Guillaume Chazarain <guichaz@...il.com>,
linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
lenb@...nel.org
Subject: Re: ACPI regression in 2.6.25-rc6 (function keys stop working)
Tim Elliott wrote:
> I am seeing the same problem on my Lenovo 3000 v100. The function keys
> stopped working.
>
> tim@...-len:~$ cat /proc/interrupts
> CPU0 CPU1
> 0: 164105 0 IO-APIC-edge timer
> 1: 12560 0 IO-APIC-edge i8042
> 9: 6 0 IO-APIC-fasteoi acpi
> 12: 117534 0 IO-APIC-edge i8042
> 14: 51 0 IO-APIC-edge ide0
> 16: 31 0 IO-APIC-fasteoi uhci_hcd:usb4,
> i915@pci:0000:00:02.0
> 18: 121892 0 IO-APIC-fasteoi uhci_hcd:usb3, iwl3945
> 19: 36197 0 IO-APIC-fasteoi uhci_hcd:usb2, ahci
> 20: 7931 0 IO-APIC-fasteoi eth0
> 22: 11071 0 IO-APIC-fasteoi sdhc0:slot0, HDA Intel
> 23: 5 0 IO-APIC-fasteoi uhci_hcd:usb1, ehci_hcd:usb5
> NMI: 0 0 Non-maskable interrupts
> LOC: 11296 73879 Local timer interrupts
> RES: 23199 49164 Rescheduling interrupts
> CAL: 297 27033 function call interrupts
> TLB: 838 1286 TLB shootdowns
> TRM: 0 0 Thermal event interrupts
> THR: 0 0 Threshold APIC interrupts
> SPU: 0 0 Spurious interrupts
> ERR: 0
>
> The problem goes away when reverting 2c81ce4c9c37b910210f2640c28e98a0c398dc26
>
> Reverting the above and applying the patch in comment #38 of bug #9998
> also works (http://bugzilla.kernel.org/show_bug.cgi?id=9998).
reverting the above and patch in comment #38 of #9998 are the same thing.
I am really interested if after revert (or application of #38) you notice a
difference in interrupt count before and after applying #37 from #9998.
Thanks,
Alex.
>
> Cheers,
> Tim
>
> On 3/18/08, Alexey Starikovskiy <astarikovskiy@...e.de> wrote:
>> Hi Guillaume,
>>
>> Please check if the patch to call _PSW methods, attached to bug #9998
>> helps to reduce number of ACPI interrupts if you revert the 2c81ce4c9c3
>>
>> Thanks,
>> Alex.
>>
>>
>> Guillaume Chazarain wrote:
>> > Hi,
>> >
>> > There is an ACPI regression in 2.6.25-rc6, which causes the ACPI keys
>> > to stop working on my laptop, an Asus V6VA. git bisect identified the
>> > appended commit as guilty, and reverting it indeed fixes the problem
>> > for me. Attached are my .config, a good dmesg and a bad one. The diff
>> > between both dmesg reveals this interesting hunk:
>> >
>> > @@ -121,8 +121,9 @@
>> > ACPI: (supports S0 S1 S3 S4 S5)
>> > ACPI: Using IOAPIC for interrupt routing
>> > ACPI: EC: non-query interrupt received, switching to interrupt mode
>> > +ACPI: EC: GPE storm detected, disabling EC GPE
>> > ACPI: EC: GPE = 0x1c, I/O: command/status = 0x66, data = 0x62
>> > -ACPI: EC: driver started in interrupt mode
>> > +ACPI: EC: driver started in poll mode
>> > ACPI: PCI Root Bridge [PCI0] (0000:00)
>> > pci 0000:00:1f.0: Enabled ICH6/i801 SMBus device
>> > pci 0000:00:1f.0: quirk: region 0800-087f claimed by ICH6 ACPI/GPIO/TCO
>> >
>> >
>> > Thanks.
>> >
>> >
>> > commit 2c81ce4c9c37b910210f2640c28e98a0c398dc26
>> > Author: Alexey Starikovskiy <astarikovskiy@...e.de>
>> > Date: Tue Mar 11 13:30:00 2008 -0400
>> >
>> > ACPI: EC: Handle IRQ storm on Acer laptops
>> >
>> > On some Acer systems, the HW fails to clear the GPE source,
>> > causing an interrupt storm.
>> >
>> > So in EC interrupt mode, we count how many interrupts we
>> > receive when waiting. If we get more than 5, we give
>> > up on interrupt mode and revert to polling mode.
>> >
>> > Also, for polling mode to work on Acers, we need
>> > to insert a delay.
>> >
>> > Signed-off-by: Alexey Starikovskiy <astarikovskiy@...e.de>
>> > Signed-off-by: Len Brown <len.brown@...el.com>
>> >
>> > diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
>> > index caf873c..2c77359 100644
>> > --- a/drivers/acpi/ec.c
>> > +++ b/drivers/acpi/ec.c
>> > @@ -129,6 +129,7 @@ static struct acpi_ec {
>> > struct mutex lock;
>> > wait_queue_head_t wait;
>> > struct list_head list;
>> > + atomic_t irq_count;
>> > u8 handlers_installed;
>> > } *boot_ec, *first_ec;
>> >
>> > @@ -181,6 +182,8 @@ static int acpi_ec_wait(struct acpi_ec *ec, enum
>> > ec_event event, int force_poll)
>> > {
>> > int ret = 0;
>> >
>> > + atomic_set(&ec->irq_count, 0);
>> > +
>> > if (unlikely(event == ACPI_EC_EVENT_OBF_1 &&
>> > test_bit(EC_FLAGS_NO_OBF1_GPE, &ec->flags)))
>> > force_poll = 1;
>> > @@ -227,6 +230,7 @@ static int acpi_ec_wait(struct acpi_ec *ec, enum
>> > ec_event event, int force_poll)
>> > while (time_before(jiffies, delay)) {
>> > if (acpi_ec_check_status(ec, event))
>> > goto end;
>> > + msleep(5);
>> > }
>> > }
>> > pr_err(PREFIX "acpi_ec_wait timeout,"
>> > @@ -529,6 +533,13 @@ static u32 acpi_ec_gpe_handler(void *data)
>> > struct acpi_ec *ec = data;
>> >
>> > pr_debug(PREFIX "~~~> interrupt\n");
>> > + atomic_inc(&ec->irq_count);
>> > + if (atomic_read(&ec->irq_count) > 5) {
>> > + pr_err(PREFIX "GPE storm detected, disabling EC GPE\n");
>> > + acpi_disable_gpe(NULL, ec->gpe, ACPI_ISR);
>> > + clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
>> > + return ACPI_INTERRUPT_HANDLED;
>> > + }
>> > clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
>> > if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))
>> > wake_up(&ec->wait);
>> >
>> >
>>
>>
>> --
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