Re: i686 quirk for AMD Geode

Lennart Sorensen
2009-11-17T18:33:53Z

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@vt.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@zytor.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