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xen-devel
[Xen-devel] Re: [RFC PATCH] acpi/xen: Evaluate the _PDC properly (for 2.
To: |
"Konrad Rzeszutek Wilk" <konrad.wilk@xxxxxxxxxx> |
Subject: |
[Xen-devel] Re: [RFC PATCH] acpi/xen: Evaluate the _PDC properly (for 2.6.32, and 2.6.39) |
From: |
"Jan Beulich" <JBeulich@xxxxxxxxxx> |
Date: |
Wed, 15 Jun 2011 15:15:59 +0100 |
Cc: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, bderzhavets@xxxxxxxxx, ke.yu@xxxxxxxxx, carsten@xxxxxxxxxx, tom.goetz@xxxxxxxxxxxxxxxxxxx |
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Wed, 15 Jun 2011 07:17:07 -0700 |
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<20110615134615.GA7529@xxxxxxxxxxxx> |
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>>> On 15.06.11 at 15:46, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> wrote:
> I was trying to bring up an prototype box and it while it booted fine under
> Linux, if I tried to do it under Dom0 with a modified Linux kernel it
> crashed.
> By modified I mean it had the "xen/acpi: add xen acpi processor driver"
> patch in it.
>
> I traced it down to a one line fix which fixed the issue.
> It might make sense to back-port this to the 2.6.32 tree, and it _might_ fix
The parameter type change happened in 2.6.33.
Jan
> some problems folks had with the processor_xen module (CC-ed here). If you
> see a similar stack trace to the one outlined in the patch - then you might
> be hitting this bug.
>
> Anyhow, I am not that familiar with Linux ACPI parser or how the P states
> are exposed - so it might be that this patch is completly bogus. Feedback
> would be much appreciated.
>
>
> commit 498adade0091900564e6a6bf06a0f793f09d4764
> Author: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> Date: Tue Jun 14 21:44:35 2011 -0400
>
> acpi/xen: Evaluate the _PDC properly.
>
> The call to evaluate the _PDC was passing in the wrong argument.
>
> Instead of passing in the acpi_handle it was passing in the structure
> that held the acpi_handle as the second member. This can cause
> the wrong evaluation on some machines ending up in trying to evaluate
> the _PDC and dereferencing the prefix node (which is not part of
> that structure) and causing a NULL pointer exception.
>
> The results after running with this patch (and yes, there are no _PDC
> on this box):
>
> nsxfeval-0180 [2017820672] [4294967276] evaluate_object : ----Entry
> nsxfeval-0359 [2017820672] [4294967276] evaluate_object : ----Exit-
> ****Exception****: AE_BAD_PARAMETER
> processor_core-0306 [2017820672] [4294967275] processor_eval_pdc :
> Could not evaluate _PDC, using legacy perf. control.
> nsxfeval-0180 [2017820672] [4294967276] evaluate_object : ----Entry
> nsxfeval-0263 [2017820672] [4294967276] evaluate_object : pathname
> is [_PPC]
> nseval-0090 [2017820672] [4294967277] ns_evaluate : ----Entry
> nsutils-0707 [2017820672] [4294967278] ns_get_node : ----Entry
> ffffffff8173d637
> nsutils-0391 [2017820672] [4294967279] ns_internalize_name : ----Entry
> nsutils-0280 [2017820672] [4294967280] ns_build_internal_name: ----Entry
>
> Without the patch (I enabled tracing here so there are more details,
> note the prefix scope):
>
> nsxfeval-0180 [2017820672] [4294967276] evaluate_object : ----Entry
> utcopy-0641 [2017820672] [4294967277] ut_copy_eobject_to_iob: ----Entry
> utcopy-0459 [2017820672] [4294967278] ut_copy_esimple_to_isi: ----Entry
> utobject-0097 [2017820672] [4294967279] ut_create_internal_obj: ----Entry
> Buffer
> utobject-0385 [2017820672] [4294967280] ut_allocate_object_des: ----Entry
> utobject-0401 [2017820672] [4294967280] ut_allocate_object_des:
> ffff8800779748b8 Size 48
> utobject-0403 [2017820672] [4294967280] ut_allocate_object_des: ----Exit-
> ffff8800779748b8
> utobject-0146 [2017820672] [4294967279] ut_create_internal_obj: ----Exit-
> ffff8800779748b8
> utcopy-0552 [2017820672] [4294967278] ut_copy_esimple_to_isi: ----Exit-
> AE_OK
> utcopy-0656 [2017820672] [4294967277] ut_copy_eobject_to_iob: ----Exit-
> AE_OK
> nsxfeval-0263 [2017820672] [4294967276] evaluate_object : pathname
> is [_PDC]
> nseval-0090 [2017820672] [4294967277] ns_evaluate : ----Entry
> nsutils-0707 [2017820672] [4294967278] ns_get_node : ----Entry
> ffffffff81733097
> nsutils-0391 [2017820672] [4294967279] ns_internalize_name : ----Entry
> nsutils-0280 [2017820672] [4294967280] ns_build_internal_name: ----Entry
> nsutils-0363 [2017820672] [4
294967280] ns_build_internal_name: Returning
> [ffff880069151ef0] (rel) "_PDC"
> nsutils-0366 [2017820672] [4294967280] ns_build_internal_name: ----Exit-
> AE_OK
> nsutils-0419 [2017820672] [4294967279] ns_internalize_name : ----Exit-
> AE_OK
> utmutex-0255 [2017820672] [4294967278] ut_acquire_mutex : Thread
> 2017820672 attempting to acquire Mutex [ACPI_MTX_Namespace]
> osl-0973 [2017820672] [4294967278] os_wait_semaphore : Waiting
> for semaphore[ffff88007f004280|1|65535]
> osl-0992 [2017820672] [4294967278] os_wait_semaphore : Acquired
> semaphore[ffff88007f004280|1|65535] utmutex-0263 [2017820672] [4294967278]
> ut_acquire_mutex : Thread 2017820672 acquired Mutex [ACPI_MTX_Namespace]
> nsaccess-0301 [2017820672] [4294967279] ns_lookup : ----Entry
> nsutils-0663 [2017820672] [4294967280] ns_opens_scope : ----Entry
> Untyped
> nsutils-0673 [2017820672] [4294967280] ns_opens_scope : ----Exit-
> 0000000000000000
> nsaccess-0398 [2017820672] [4294967279] ns_lookup : Searching
> relative to prefix scope [ÿÿÿÿ] (ffff880069163800)
> nsaccess-0510 [2017820672] [4294967279] ns_lookup : Simple
> Pathname (1 segment, Flags=2)
> nsdump-0087 [2017820672] [4294967279] ns_print_pathname : [_PDC]
> nssearch-0297 [2017820672] [4294967280] ns_search_and_enter : ----Entry
> nssearch-0102 [2017820672] [4294967281] ns_search_one_scope : ----Entry
> nsnames-0139 [2017820672] [4294967282] ns_get_external_pathna: ----Entry
> ffff880069163800
> BUG: unable to handle kernel NULL pointer dereference at
> 0000000000000418
> IP: [<ffffffff8129266f>] acpi_ns_get_pathname_length+0x1f/0x68
> .. snip..
> Pid: 1, comm: swapper Not tainted 2.6.39.1-00221-gbb09547 #1 Intel
> Corporation S2600CP/S2600CP
> .. snip..
> Call Trace:
> [<ffffffff81292905>] acpi_ns_get_external_pathname+0x38/0x137
> [<ffffffff81290a1f>] acpi_ns_search_one_scope+0x4b/0x1f5
> [<ffffffff81290cfa>] acpi_ns_search_and_enter+0x131/0x42f
> [<ffffffff81290310>] acpi_ns_lookup+0x4c8/0x6c9
> [<ffffffff812933e3>] acpi_ns_get_node+0xe8/0x16e
> [<ffffffff812920bf>] acpi_ns_evaluate+0x83/0x3b6
> [<ffffffff812916f7>] acpi_evaluate_object+0x1f9/0x35b
> [<ffffffff81123d7b>] ? kmem_cache_alloc_trace+0xa0/0xb0
> [<ffffffff814a4e35>] acpi_processor_set_pdc+0x1cc/0x226
> [<ffffffff814a5a1e>] xen_acpi_processor_add+0x45c/0x59d
>
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
>
> diff --git a/drivers/acpi/processor_xen.c b/drivers/acpi/processor_xen.c
> index 43760f8..db54525 100644
> --- a/drivers/acpi/processor_xen.c
> +++ b/drivers/acpi/processor_xen.c
> @@ -311,7 +311,7 @@ static int __cpuinit xen_acpi_processor_add(struct
> acpi_device *device)
> }
>
> /* _PDC call should be done before doing anything else (if reqd.). */
> - acpi_processor_set_pdc(pr);
> + acpi_processor_set_pdc(pr->handle);
>
> #ifdef CONFIG_CPU_FREQ
> xen_acpi_processor_ppc_has_changed(pr);
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