linux-kernel - Re: [LKP] [x86/intel/quark] 8bbc2a135b6: WARNING: CPU: 0 PID: 1 at arch/x86/platform/intel-quark/imr.c:358 imr_add

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Message-ID: <5519060A.3080909@nexus-software.ie>
Date:	Mon, 30 Mar 2015 09:15:06 +0100
From:	Bryan O'Donoghue <pure.logic@...us-software.ie>
To:	Huang Ying <ying.huang@...el.com>
CC:	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>, LKP ML <lkp@...org>
Subject: Re: [LKP] [x86/intel/quark] 8bbc2a135b6: WARNING: CPU: 0 PID: 1 at
 arch/x86/platform/intel-quark/imr.c:358 imr_add_range+0x2b4/0x370()


> [    0.752570]  [<c1ab0845>] dump_stack+0x16/0x18
> [    0.752570]  [<c1ab0845>] dump_stack+0x16/0x18
> [    0.753420]  [<c103bb27>] warn_slowpath_common+0x87/0xc0
> [    0.753420]  [<c103bb27>] warn_slowpath_common+0x87/0xc0
> [    0.754429]  [<c1038674>] ? imr_add_range+0x2b4/0x370
> [    0.754429]  [<c1038674>] ? imr_add_range+0x2b4/0x370
> [    0.755384]  [<c1038674>] ? imr_add_range+0x2b4/0x370
> [    0.755384]  [<c1038674>] ? imr_add_range+0x2b4/0x370
> [    0.756335]  [<c103bbc3>] warn_slowpath_fmt+0x33/0x40
> [    0.756335]  [<c103bbc3>] warn_slowpath_fmt+0x33/0x40
> [    0.757293]  [<c1038674>] imr_add_range+0x2b4/0x370
> [    0.757293]  [<c1038674>] imr_add_range+0x2b4/0x370
> [    0.758219]  [<c103057c>] ? slow_virt_to_phys+0x2c/0x90
> [    0.758219]  [<c103057c>] ? slow_virt_to_phys+0x2c/0x90
> [    0.759200]  [<c103209a>] ? __phys_addr+0x3a/0x90
> [    0.759200]  [<c103209a>] ? __phys_addr+0x3a/0x90
> [    0.760090]  [<c106e4de>] ? debug_check_no_locks_freed+0x9e/0x160
> [    0.760090]  [<c106e4de>] ? debug_check_no_locks_freed+0x9e/0x160
> [    0.761361]  [<c103057c>] ? slow_virt_to_phys+0x2c/0x90
> [    0.761361]  [<c103057c>] ? slow_virt_to_phys+0x2c/0x90
> [    0.762419]  [<c1fb836a>] imr_self_test_init+0x40/0x1d9
> [    0.762419]  [<c1fb836a>] imr_self_test_init+0x40/0x1d9
> [    0.763439]  [<c1fb832a>] ? imr_self_test_result+0x4e/0x4e
> [    0.763439]  [<c1fb832a>] ? imr_self_test_result+0x4e/0x4e
> [    0.764477]  [<c1fa7d03>] do_one_initcall+0x180/0x193
> [    0.764477]  [<c1fa7d03>] do_one_initcall+0x180/0x193
> [    0.765443]  [<c10568bb>] ? parse_args+0x25b/0x530
> [    0.765443]  [<c10568bb>] ? parse_args+0x25b/0x530
> [    0.766350]  [<c1fa7dec>] kernel_init_freeable+0xd6/0x153
> [    0.766350]  [<c1fa7dec>] kernel_init_freeable+0xd6/0x153
> [    0.767370]  [<c1fa7dec>] ? kernel_init_freeable+0xd6/0x153
> [    0.767370]  [<c1fa7dec>] ? kernel_init_freeable+0xd6/0x153
> [    0.768426]  [<c1aab7a0>] kernel_init+0x10/0xe0
> [    0.768426]  [<c1aab7a0>] kernel_init+0x10/0xe0
> [    0.769296]  [<c1061445>] ? schedule_tail+0x25/0x70
> [    0.769296]  [<c1061445>] ? schedule_tail+0x25/0x70
> [    0.770424]  [<c1abe060>] ret_from_kernel_thread+0x20/0x30
> [    0.770424]  [<c1abe060>] ret_from_kernel_thread+0x20/0x30
> [    0.771456]  [<c1aab790>] ? rest_init+0xb0/0xb0
> [    0.771456]  [<c1aab790>] ? rest_init+0xb0/0xb0
> [    0.772362] ---[ end trace e098947396137dbd ]---
> [    0.772362] ---[ end trace e098947396137dbd ]---

Well the self test fails like it should on hardware without IMR support :)

Curious what the QEMU setup is like ?

To get to the self test code we need to get past this

static const struct x86_cpu_id imr_ids[] __initconst = {
         { X86_VENDOR_INTEL, 5, 9 },     /* Intel Quark SoC X1000. */
         {}
};
MODULE_DEVICE_TABLE(x86cpu, imr_ids);

if (!x86_match_cpu(imr_ids) || !iosf_mbi_available())
     return -ENODEV;

Looks to me like a version of QEMU that reports iosf_mbi available, 
cpuid 5/9 but lacks full IMR support ?

How do I replicate this setup ?
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