linux-kernel - Re: i686 quirk for AMD Geode

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Date:	Tue, 17 Nov 2009 13:33:57 -0500
From:	lsorense@...lub.uwaterloo.ca (Lennart Sorensen)
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>,
	Valdis.Kletnieks@...edu, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Pavel Machek <pavel@....cz>,
	Matteo Croce <technoboy85@...il.com>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: i686 quirk for AMD Geode

On Tue, Nov 17, 2009 at 09:33:02AM -0800, H. Peter Anvin wrote:
> On 11/17/2009 09:25 AM, Lennart Sorensen wrote:
> > On Tue, Nov 17, 2009 at 11:48:47AM -0500, Valdis.Kletnieks@...edu wrote:
> >> Umm...  'modprobe msr'?
> >>
> >> (Recently I had what *looked* like an xorg server bug, turned out to be a
> >> missing CONFIG_INPUT_EVDEV.. Whoops. ;)
> > 
> > I did.  Makes no difference.  If I unload it I get the same error.
> > 
> > # modinfo msr
> > filename:       /lib/modules/2.6.26-2-gx1/kernel/arch/x86/kernel/msr.ko
> > author:         H. Peter Anvin <hpa@...or.com>
> > description:    x86 generic MSR driver
> > license:        GPL
> > vermagic:       2.6.26-2-gx1 mod_unload GEODEGX1
> > depends:
> > 
> > # lsmod |grep msr
> > msr                     2692  0
> > 
> > I don't get it.
> > 
> 
> Does /dev/cpu/*/msr exist?

I ran MAKEDEV cpu in /dev, but to make sure...

# ls -l /dev/cpu/*/msr
crw------- 1 root root 202, 0 Nov 16 12:28 /dev/cpu/0/msr
crw------- 1 root root 202, 1 Nov 16 12:28 /dev/cpu/1/msr
crw------- 1 root root 202, 2 Nov 16 12:28 /dev/cpu/2/msr
crw------- 1 root root 202, 3 Nov 16 12:28 /dev/cpu/3/msr

Looks OK too.

# strace ./rdmsr -x 0x00001810
execve("./rdmsr", ["./rdmsr", "-x", "0x00001810"], [/* 13 vars */]) = 0
uname({sys="Linux", node="ruggedrouter", ...}) = 0
brk(0)                                  = 0x8106000
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f23000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f22000
open("/etc/ld.so.cache", O_RDONLY)      = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=14975, ...}) = 0
mmap2(NULL, 14975, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7f1e000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
open("/lib/tls/libc.so.6", O_RDONLY)    = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\240O\1"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0644, st_size=1245488, ...}) = 0
mmap2(NULL, 1251484, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xb7dec000
mmap2(0xb7f14000, 28672, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x128) = 0xb7f14000
mmap2(0xb7f1b000, 10396, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb7f1b000
close(3)                                = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7deb000
mprotect(0xb7f14000, 20480, PROT_READ)  = 0
set_thread_area({entry_number:-1 -> 6, base_addr:0xb7deb6c0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0
munmap(0xb7f1e000, 14975)               = 0
open("/dev/cpu/0/msr", O_RDONLY|O_LARGEFILE) = 3
pread64(3, 0xbf83ac00, 8, 6160)         = -1 EIO (Input/output error)
write(2, "rdmsr: CPU 0 cannot read MSR 0x0"..., 40rdmsr: CPU 0 cannot read MSR 0x00001810
) = 40
exit_group(4)                           = ?
Process 15044 detached

-- 
Len Sorensen
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