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Message-ID: <20090511134140.GH4624@lenovo>
Date:	Mon, 11 May 2009 17:41:40 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	yinghai@...nel.org, tglx@...utronix.de, eswierk@...stanetworks.com,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/apic] x86: read apic ID in the !acpi_lapic case

[Ingo Molnar - Mon, May 11, 2009 at 01:02:34PM +0200]
| 
| * tip-bot for Yinghai Lu <yinghai@...nel.org> wrote:
| 
| > Commit-ID:  4401da6111ac58f94234417427d06a72c4048c74
| > Gitweb:     http://git.kernel.org/tip/4401da6111ac58f94234417427d06a72c4048c74
| > Author:     Yinghai Lu <yinghai@...nel.org>
| > AuthorDate: Sat, 2 May 2009 10:40:57 -0700
| > Committer:  Ingo Molnar <mingo@...e.hu>
| > 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@...e.hu>
	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@...nvz.org>
---
 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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