Re: [tip:x86/apic] x86: read apic ID in the !acpi_lapic case

From: Cyrill Gorcunov
Date: Mon May 11 2009 - 09:43:45 EST

[Ingo Molnar - Mon, May 11, 2009 at 01:02:34PM +0200]
|
| * tip-bot for Yinghai Lu <yinghai@xxxxxxxxxx> wrote:
|
| > Commit-ID: 4401da6111ac58f94234417427d06a72c4048c74
| > Gitweb: http://git.kernel.org/tip/4401da6111ac58f94234417427d06a72c4048c74
| > Author: Yinghai Lu <yinghai@xxxxxxxxxx>
| > AuthorDate: Sat, 2 May 2009 10:40:57 -0700
| > Committer: Ingo Molnar <mingo@xxxxxxx>
| > CommitDate: Mon, 11 May 2009 11:29:23 +0200
| >
| > x86: read apic ID in the !acpi_lapic case
| >
| > Ed found that on 32-bit, boot_cpu_physical_apicid is not read right,
| > when the mptable is broken.
|
| -tip testing found that this patch causes a kernel crash:
|
| [ 1.208000] initcall pci_iommu_init+0x0/0x11 returned 0 after 0 usecs
| [ 1.212000] calling print_all_ICs+0x0/0x62a @ 1
| [ 1.216000]
| [ 1.216000] printing PIC contents
| [ 1.220000] ... PIC IMR: fffa
| [ 1.220000] ... PIC IRR: 0000
| [ 1.224000] ... PIC ISR: 0000
| [ 1.228000] ... PIC ELCR: 0828
| [ 1.232000] BUG: unable to handle kernel paging request at ffffb020
| [ 1.232000] IP: [<78417d5c>] native_apic_mem_read+0x15/0x19
| [ 1.232000] *pde = 010ef067 *pte = 00000000
| [ 1.232000] Oops: 0000 [#1] PREEMPT
| [ 1.232000] last sysfs file:
| [ 1.232000] Modules linked in:
| [ 1.232000]
| [ 1.232000] Pid: 1, comm: swapper Not tainted (2.6.30-rc5-tip #40847) System Product Name
| [ 1.232000] EIP: 0060:[<78417d5c>] EFLAGS: 00010046 CPU: 0
| [ 1.232000] EIP is at native_apic_mem_read+0x15/0x19
| [ 1.232000] EAX: ffffb020 EBX: 00000000 ECX: 00000000 EDX: fffff000
| [ 1.232000] ESI: 00000000 EDI: 7908c52e EBP: 9786fd38 ESP: 9786fd38
| [ 1.232000] DS: 007b ES: 007b FS: 0000 GS: 00e0 SS: 0068
| [ 1.232000] Process swapper (pid: 1, ti=9786e000 task=97870000 task.ti=9786e000)
| [ 1.232000] Stack:
| [ 1.232000] 9786fd40 78416e0d 9786fd48 78416fad 9786fd64 7908c55f 00000001 00000000
| [ 1.232000] 00000000 00000000 7908c52e 9786fd78 784671bf 00000001 00000000 00000000
| [ 1.232000] 9786fdac 7908ca42 00000001 9786fda0 784551ad 00000001 00000000 487ab0fc
| [ 1.232000] Call Trace:
| [ 1.232000] [<78416e0d>] ? read_apic_id+0x19/0x24
| [ 1.232000] [<78416fad>] ? hard_smp_processor_id+0xd/0xf
| [ 1.232000] [<7908c55f>] ? print_local_APIC+0x31/0x3c7
| [ 1.232000] [<7908c52e>] ? print_local_APIC+0x0/0x3c7
| [ 1.232000] [<784671bf>] ? smp_call_function_single+0x5b/0x64
| [ 1.232000] [<7908ca42>] ? print_all_ICs+0x14d/0x62a
| [ 1.232000] [<784551ad>] ? ktime_get+0x16/0x34
| [ 1.232000] [<7908c8f5>] ? print_all_ICs+0x0/0x62a
| [ 1.232000] [<7908c8f5>] ? print_all_ICs+0x0/0x62a
| [ 1.232000] [<7840107f>] ? _stext+0x7f/0x1f2
| [ 1.232000] [<786c2658>] ? put_dec+0x44/0x137
| [ 1.232000] [<784afae4>] ? page_count+0x22/0x3f
| [ 1.232000] [<784b1c0a>] ? get_page_from_freelist+0x51f/0x6b0
| [ 1.232000] [<786c2658>] ? put_dec+0x44/0x137
| [ 1.232000] [<784dcbee>] ? check_object+0x207/0x252
| [ 1.232000] [<786bb54f>] ? ida_get_new_above+0x2b0/0x2ca
| [ 1.232000] [<784dd5c5>] ? __slab_free+0x11a/0x4af
| [ 1.232000] [<784df012>] ? kmem_cache_free+0xce/0x163
| [ 1.232000] [<786bb54f>] ? ida_get_new_above+0x2b0/0x2ca
| [ 1.232000] [<786bb54f>] ? ida_get_new_above+0x2b0/0x2ca
| [ 1.232000] [<786bb75f>] ? ida_pre_get+0x13/0x18b
| [ 1.232000] [<7853f384>] ? proc_register+0x32a/0x34e
| [ 1.232000] [<7853f5bd>] ? create_proc_entry+0xf0/0x119
| [ 1.232000] [<7847e0bc>] ? register_irq_proc+0x87/0xbb
| [ 1.232000] [<7908251b>] ? kernel_init+0x8d/0x10a
| [ 1.232000] [<7908248e>] ? kernel_init+0x0/0x10a
| [ 1.232000] [<78403ee7>] ? kernel_thread_helper+0x7/0x10
| [ 1.232000] Code: 44 00 00 89 d1 8b 15 08 8b de 78 8d 84 10 00 c0 ff ff 89 08 5d c3 55 89 e5 0f 1f 44 00 00 8b 15 08 8b de 78 8d 84 10 00 c0 ff ff <8b> 00 5d c3 55 89 e5 0f 1f 44 00 00 89 c2 eb 02 f3 90 8b 02 85
| [ 1.232000] EIP: [<78417d5c>] native_apic_mem_read+0x15/0x19 SS:ESP 0068:9786fd38
| [ 1.232000] CR2: 00000000ffffb020
| [ 1.232000] ---[ end trace a7919e7f17c0a725 ]---
| [ 1.232000] Kernel panic - not syncing: Fatal exception
|
| Ingo

Ingo, could check if the following do the trick?
(on top of

commit f6271becbae641903a9f703b7b75cccb202df82a
Merge: 486cb6c 0498625
Author: Ingo Molnar <mingo@xxxxxxx>
Date: Mon May 11 12:26:00 2009 +0200

Merge branch 'tracing/core'
)


-- Cyrill
---

x86: apic - fixmap apic address even if apic disabled

In case if apic were disabled by boot option
we still need read_apic operation. So fixmap
a fake apic area if needed.

Signed-off-by: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
---
arch/x86/kernel/apic/apic.c | 17 +++++++++--------
1 file changed, 9 insertions(+), 8 deletions(-)

Index: linux-2.6.git/arch/x86/kernel/apic/apic.c
=====================================================================
--- linux-2.6.git.orig/arch/x86/kernel/apic/apic.c
+++ linux-2.6.git/arch/x86/kernel/apic/apic.c
@@ -1591,13 +1591,6 @@ void __init init_apic_mappings(void)
} else
apic_phys = mp_lapic_addr;

- /* lets check if we may NOP'ify apic operations */
- if (!cpu_has_apic) {
- pr_info("APIC: disable apic facility\n");
- apic_disable();
- return;
- }
-
/*
* acpi lapic path already maps that address in
* acpi_register_lapic_address()
@@ -1606,7 +1599,15 @@ void __init init_apic_mappings(void)
set_fixmap_nocache(FIX_APIC_BASE, apic_phys);

apic_printk(APIC_VERBOSE, "mapped APIC to %08lx (%08lx)\n",
- APIC_BASE, apic_phys);
+ APIC_BASE, apic_phys);
+
+ /* lets check if we may NOP'ify apic operations */
+ if (!cpu_has_apic) {
+ pr_info("APIC: disable apic facility\n");
+ apic_disable();
+ return;
+ }
+
/*
* Fetch the APIC ID of the BSP in case we have a
* default configuration (or the MP table is broken).
--
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