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Home » PS3 » OtherOS++ » Linux » Linux Kernelp 3.2.2 and kexec problems
Linux Kernelp 3.2.2 and kexec problems [message #375] Sat, 28 January 2012 17:56 Go to next message
glevand is currently offline  glevand
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Registered: July 2011
Location: SONY
Gitbrew God
Trying to figure out why kexec hangs. Probably USB problems.

[Updated on: Sat, 28 January 2012 17:58]

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Re: Linux Kernelp 3.2.2 and kexec problems [message #453 is a reply to message #375] Mon, 30 January 2012 19:45 Go to previous messageGo to next message
glevand is currently offline  glevand
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Registered: July 2011
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System Manager service Ring Buzzer is really helpful with debugging kernel problems.
It can be used very early during Linux kernel boot, e.g. when gelic udbg is not available.
It worked even in arch/powerpc/kernel/setup_64.c:early_setup or
arch/powerpc/kernel/misc_64.S:kexec_sequence.

#include <asm/ps3.h>
#include <asm/lv1call.h>

void sysmgr_beep(void)
{
        unsigned char data[] = {
                /* header */
                0x01,                   /* version */
                0x10,                   /* header length */
                0x00, 0x00,
                0x00, 0x00, 0x00, 0x08, /* payload length */
                0x00, 0x15,             /* sid */
                0x00, 0x00,
                0x00, 0x00, 0x00, 0x00, /* tag */
                /* payload */
                0x01,                   /* version */
                0x29,                   /* arg1 */
                0x0a,                   /* arg2 */
                0x00,
                0x00, 0x00, 0x01, 0xb6  /* arg3 */
        };
        u64 written;
        int i;

        //lv1_write_virtual_uart(2, ps3_mm_phys_to_lpar(__pa(data)), sizeof(data), &written);
        lv1_write_virtual_uart(2, __pa(data), sizeof(data), &written);

        for (i = 0; i < 10000; i++)
                __asm__ __volatile__ ("nop");
}

[Updated on: Mon, 30 January 2012 19:54]

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Re: Linux Kernelp 3.2.2 and kexec problems [message #454 is a reply to message #453] Mon, 30 January 2012 20:02 Go to previous messageGo to next message
glevand is currently offline  glevand
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Registered: July 2011
Location: SONY
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Wow, cool, ring buzzer even worked after

bl      .kexec_copy_flush


in arch/powerpc/kernel/misc_64.S

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Re: Linux Kernelp 3.2.2 and kexec problems [message #455 is a reply to message #454] Mon, 30 January 2012 20:08 Go to previous messageGo to next message
glevand is currently offline  glevand
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Holy cow, it even worked after 

bl      real_mode


in arch/powerpc/kernel/misc_64.S.

That means it works in real mode too. And that kexec worked until this point Smile

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Re: Linux Kernelp 3.2.2 and kexec problems [message #456 is a reply to message #455] Mon, 30 January 2012 20:12 Go to previous messageGo to next message
glevand is currently offline  glevand
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Holy crap, it worked even after 

stw     r6,kexec_flag-1b(5)


in arch/powerpc/kernel/misc_64.S.

Looking further.

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Re: Linux Kernelp 3.2.2 and kexec problems [message #457 is a reply to message #456] Mon, 30 January 2012 20:17 Go to previous messageGo to next message
glevand is currently offline  glevand
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Ok, traced kexec till the end. It works until the point where it jumps to new kernel image. Good.

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Re: Linux Kernelp 3.2.2 and kexec problems [message #458 is a reply to message #457] Mon, 30 January 2012 20:24 Go to previous messageGo to next message
glevand is currently offline  glevand
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Wow, cool, kexec even works till the point where it jumps to the new kernel without unloading USB drivers Smile That's great.
So, the problem is somewhere in startup process.

[Updated on: Mon, 30 January 2012 20:25]

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Re: Linux Kernelp 3.2.2 and kexec problems [message #459 is a reply to message #458] Mon, 30 January 2012 20:32 Go to previous messageGo to next message
x_redentor is currently offline  x_redentor
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jajaja , you're a machine, you're good dude

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Re: Linux Kernelp 3.2.2 and kexec problems [message #464 is a reply to message #459] Tue, 31 January 2012 18:41 Go to previous messageGo to next message
glevand is currently offline  glevand
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kexec segments with new image:

root@ps3-linux:/# kexec -l /var/petitboot/mnt/sda1/openwrt-ps3-petitboot-vmlinux
.elf
Warning: append= option is not passed. Using the first kernel root partition
Modified cmdline:
Unable to find /proc/device-tree//chosen/linux,stdout-path, printing from purgatory is diabled
segment[0].mem:0x83b000 memsz:8626176
segment[1].mem:0x1075000 memsz:36864
segment[2].mem:0x7fff000 memsz:4096

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Re: Linux Kernelp 3.2.2 and kexec problems [message #465 is a reply to message #464] Tue, 31 January 2012 18:42 Go to previous messageGo to next message
glevand is currently offline  glevand
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Yes, it works, finally !!! kexec works with new image. I can kexec the new image on the new image. Cool.
Kexec works great with Linux kernel 3.2.2.

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Re: Linux Kernelp 3.2.2 and kexec problems [message #466 is a reply to message #465] Tue, 31 January 2012 18:43 Go to previous messageGo to next message
glevand is currently offline  glevand
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Even better, kexec works on Linux kernel 3.2.2 without unloading USB drivers. Great Smile

[Updated on: Tue, 31 January 2012 18:43]

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Re: Linux Kernelp 3.2.2 and kexec problems [message #467 is a reply to message #466] Tue, 31 January 2012 18:55 Go to previous messageGo to next message
glevand is currently offline  glevand
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Gitbrew God
 
 === IMPORTANT ============================
  Use 'passwd' to set your login password
  this will disable telnet and enable SSH
 ------------------------------------------


BusyBox v1.19.3 (2012-01-31 17:28:21 CET) built-in shell (ash)
Enter 'help' for a list of built-in commands.

  _____  _____  _____
 |  _  ||  ___||___  |
 |   __||___  ||___  |
 |__|   |_____||_____|
            L I N U X

root@ps3-linux:/# uname -a
Linux ps3-linux 3.2.2 #1 SMP Tue Jan 31 17:35:06 CET 2012 ppc64 GNU/Linux
root@ps3-linux:/# iwconfig wlan0
wlan0     IEEE 802.11bg  Mode:Managed  Channel:0
          Access Point: Not-Associated
          Encryption key:off

root@ps3-linux:/#

[Updated on: Tue, 31 January 2012 18:55]

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Re: Linux Kernelp 3.2.2 and kexec problems [message #468 is a reply to message #467] Tue, 31 January 2012 18:56 Go to previous messageGo to next message
glevand is currently offline  glevand
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Registered: July 2011
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Gitbrew God
 
 Petitboot PS3
 ──────────────────────────────────────────────────────────────────────────────
  main: /var/petitboot/mnt/ps3dd2/boot/vmlinux-3.2.2 root=/dev/ps3dd2
  test: /var/petitboot/mnt/ps3dd2/boot/vmlinux-3.2.2-test root=/dev/ps3dd2
  freebsd: /var/petitboot/mnt/ps3dd2/boot/loader.ps3
  netboot: tftp://192.168.1.1 root=/dev/nfs ip=any nfsroot=:
  Boot GameOS
  Set Video Mode
 *Exit to Shell












 ──────────────────────────────────────────────────────────────────────────────
 ESC=exit, Enter=accept, e=edit, o=open
 Welcome to Petitboot

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Re: Linux Kernelp 3.2.2 and kexec problems [message #469 is a reply to message #468] Tue, 31 January 2012 19:06 Go to previous messageGo to next message
glevand is currently offline  glevand
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Image for testing: http://gitbrew.org/~glevand/ps3/linux/openwrt/openwrt-ps3-pe titboot-vmlinux.elf

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Re: Linux Kernelp 3.2.2 and kexec problems [message #470 is a reply to message #469] Tue, 31 January 2012 19:27 Go to previous messageGo to next message
glevand is currently offline  glevand
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Gitbrew God
Just flashed my new petitboot to PS3 FLASH with ps3-flash-util. It works Smile

http://gitbrew.org/~glevand/ps3/linux/openwrt/dtbImage.ps3.b in

[Updated on: Tue, 31 January 2012 19:27]

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Re: Linux Kernelp 3.2.2 and kexec problems [message #514 is a reply to message #470] Thu, 02 February 2012 20:42 Go to previous messageGo to next message
glevand is currently offline  glevand
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Registered: July 2011
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It seems that kexec still has problems with USB drivers. At least with my keyboard USB driver.
Although booting linux with telnet works fine with detached keyboard. Have to investigate it.

I guess i have to use "ring buzzer" again Smile

[Updated on: Thu, 02 February 2012 20:43]

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Re: Linux Kernelp 3.2.2 and kexec problems [message #540 is a reply to message #514] Fri, 03 February 2012 21:10 Go to previous messageGo to next message
glevand is currently offline  glevand
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Registered: July 2011
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Gitbrew God
And again i'm hunting kexec bugs.

When i attach my USB keyboard then kexec hanged in

kernel/kexec.c:kexec_load
   kernel_restart_prepare
      device_shutdown


When i kexec a new kernel from telnet without attaching my USB keyboard but with an attached USB drive then it works fine. Very odd.

[Updated on: Fri, 03 February 2012 21:11]

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Re: Linux Kernelp 3.2.2 and kexec problems [message #541 is a reply to message #540] Fri, 03 February 2012 21:29 Go to previous messageGo to next message
glevand is currently offline  glevand
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Registered: July 2011
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Gitbrew God
It seems that the problem is OHCI or HID driver.

[Updated on: Fri, 03 February 2012 21:30]

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Re: Linux Kernelp 3.2.2 and kexec problems [message #543 is a reply to message #541] Fri, 03 February 2012 23:35 Go to previous messageGo to next message
glevand is currently offline  glevand
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It hangs somewhere in drivers/base/core.c:device_shutdown

I have a strong suspicion that it hangs in some spinlock.

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Re: Linux Kernelp 3.2.2 and kexec problems [message #544 is a reply to message #543] Fri, 03 February 2012 23:57 Go to previous messageGo to next message
glevand is currently offline  glevand
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The loop in device_shutdown never terminates. Great.


http://lxr.free-electrons.com/ident?a=powerpc;i=device_shutd own

[Updated on: Sat, 04 February 2012 10:58]

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Re: Linux Kernelp 3.2.2 and kexec problems [message #545 is a reply to message #544] Sat, 04 February 2012 00:04 Go to previous message
glevand is currently offline  glevand
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Interesting conversation about device_shutdown hangs here:

http://kerneltrap.org/mailarchive/linux-scsi/2010/3/3/681952 3

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