Re: Kernel doesn't boot after DRM updates (drm-next-2024-09-19)

[Hoi Pok Wu <wuhoipok@gmail.com>]

I will look into this and get back to you. Thank you.


On Tue, Oct 1, 2024 at 8:23 PM Christophe Leroy
<christophe.leroy@csgroup.eu> wrote:
>
> Hi All,
>
> Le 01/10/2024 à 14:09, Hoi Pok Wu a écrit :
> > [Vous ne recevez pas souvent de courriers de wuhoipok@gmail.com. Découvrez pourquoi ceci est important à https://aka.ms/LearnAboutSenderIdentification ]
> >
> > Hi Thomas,
> >
> > Could you help on this issue?
> > I do not have access to the hardware now.
> > Thank you.
>
> The OOPS is from function drm_dp_aux_register(), exactly here below:
>
> static inline const char *dev_name(const struct device *dev)
> {
>         /* Use the init name until the kobject becomes available */
>         if (dev->init_name)
>
>      1ae0:      e8 89 00 50     ld      r4,80(r9)
>
>
> As you see in registers dump, r9 register is NULL. That's dev which is NULL:
>
> GPR00: c0000000005b74f0 c0000000800daf10 c0000000015a3600 c00000008033f7ec
> GPR04: 0000000000000000 c000000001908f18 c000000080460c80 ffffffffc0c0c0c0
> GPR08: c000000080f74008 0000000000000000 0000000000000003 c000000080f74008
> GPR12: 0000000048000828 c00000003fffeac0 0000000000000003 0000000001000000
> GPR16: c0000000804eaeca 0000000000000013 0000000000003113 0000000000000000
> GPR20: 0000000000000008 c0000000800db208 000000000000000a c0000000014d6868
> GPR24: 0000000000000000 0000000000000001 c0000000800db29c c0000000800db250
> GPR28: c000000080bd8040 0000000000000001 c000000080f74000 c00000008033f4a0
>
> Full dump below:
>
> 0000000000001a5c <drm_dp_aux_register>:
> {
>      1a5c:      3c 4c 00 00     addis   r2,r12,0
>                         1a5e: R_PPC64_REL16_HA  .TOC.+0x2
>      1a60:      38 42 00 00     addi    r2,r2,0
>                         1a62: R_PPC64_REL16_LO  .TOC.+0x6
>      1a64:      7c 08 02 a6     mflr    r0
>      1a68:      fb e1 ff f8     std     r31,-8(r1)
>      1a6c:      f8 01 00 10     std     r0,16(r1)
>      1a70:      7c 7f 1b 78     mr      r31,r3
>      1a74:      f8 21 ff d1     stdu    r1,-48(r1)
>         WARN_ON_ONCE(!aux->drm_dev);
>      1a78:      e9 23 03 38     ld      r9,824(r3)
>      1a7c:      2f a9 00 00     cmpdi   cr7,r9,0
>      1a80:      41 de 00 90     beq-    cr7,1b10 <drm_dp_aux_register+0xb4>
>         if (!aux->ddc.algo)
>      1a84:      e9 3f 00 18     ld      r9,24(r31)
>      1a88:      2f a9 00 00     cmpdi   cr7,r9,0
>      1a8c:      41 de 00 74     beq-    cr7,1b00 <drm_dp_aux_register+0xa4>
>         strscpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev),
>      1a90:      e8 9f 00 00     ld      r4,0(r31)
>         aux->ddc.owner = THIS_MODULE;
>      1a94:      39 40 00 00     li      r10,0
>         aux->ddc.dev.parent = aux->dev;
>      1a98:      e9 3f 03 30     ld      r9,816(r31)
>         strscpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev),
>      1a9c:      38 7f 02 74     addi    r3,r31,628
>         aux->ddc.owner = THIS_MODULE;
>      1aa0:      f9 5f 00 08     std     r10,8(r31)
>         strscpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev),
>      1aa4:      2f a4 00 00     cmpdi   cr7,r4,0
>         aux->ddc.dev.parent = aux->dev;
>      1aa8:      f9 3f 00 b8     std     r9,184(r31)
>         strscpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev),
>      1aac:      41 de 00 34     beq-    cr7,1ae0 <drm_dp_aux_register+0x84>
>      1ab0:      38 a0 00 30     li      r5,48
>      1ab4:      48 00 00 01     bl      1ab4 <drm_dp_aux_register+0x58>
>                         1ab4: R_PPC64_REL24     sized_strscpy
>      1ab8:      60 00 00 00     nop
>         ret = i2c_add_adapter(&aux->ddc);
>      1abc:      38 7f 00 08     addi    r3,r31,8
>      1ac0:      48 00 00 01     bl      1ac0 <drm_dp_aux_register+0x64>
>                         1ac0: R_PPC64_REL24     i2c_add_adapter
>      1ac4:      60 00 00 00     nop
> }
>      1ac8:      38 21 00 30     addi    r1,r1,48
>      1acc:      e8 01 00 10     ld      r0,16(r1)
>      1ad0:      eb e1 ff f8     ld      r31,-8(r1)
>      1ad4:      7c 08 03 a6     mtlr    r0
>      1ad8:      4e 80 00 20     blr
>      1adc:      60 00 00 00     nop
>   * Return: The kobject name of the device, or its initial name if
> unavailable.
>   */
> static inline const char *dev_name(const struct device *dev)
> {
>         /* Use the init name until the kobject becomes available */
>         if (dev->init_name)
>      1ae0:      e8 89 00 50     ld      r4,80(r9)
>      1ae4:      2f a4 00 00     cmpdi   cr7,r4,0
>      1ae8:      40 fe ff c8     bne+    cr7,1ab0 <drm_dp_aux_register+0x54>
>                 return dev->init_name;
>
>         return kobject_name(&dev->kobj);
>      1aec:      e8 89 00 00     ld      r4,0(r9)
>      1af0:      4b ff ff c0     b       1ab0 <drm_dp_aux_register+0x54>
>      1af4:      60 00 00 00     nop
>      1af8:      60 00 00 00     nop
>      1afc:      60 00 00 00     nop
>                 drm_dp_aux_init(aux);
>      1b00:      7f e3 fb 78     mr      r3,r31
>      1b04:      48 00 00 01     bl      1b04 <drm_dp_aux_register+0xa8>
>                         1b04: R_PPC64_REL24     drm_dp_aux_init
>      1b08:      4b ff ff 88     b       1a90 <drm_dp_aux_register+0x34>
>      1b0c:      60 00 00 00     nop
>         WARN_ON_ONCE(!aux->drm_dev);
>      1b10:      0f e0 00 00     twui    r0,0
>      1b14:      4b ff ff 70     b       1a84 <drm_dp_aux_register+0x28>
>
>
>
> >
> > Regards,
> > Wu Hoi Pok
> >
> >
> > On Tue, Oct 1, 2024 at 12:26 PM Christian Zigotzky
> > <chzigotzky@xenosoft.de> wrote:
> >>
> >> On 30 September 2024 3:27pm, Alex Deucher <alexdeucher@gmail.com> wrote:
> >>
> >> + Wu Hoi Pok
> >>
> >> This is likely related to the drm device rework.
> >>
> >> Alex
> >>
> >> —————-
> >>
> >> Hi All,
> >>
> >> I was able to revert the drm-next-2024-09-19 updates for the RC1 of kernel 6.12.
> >>
> >> This kernel works on all machines without any problems.
> >>
> >> This means, the new Radeon DRM driver is unreliable after the DRM rework.
> >>
> >> Please fix this issue because we can’t deliver the kernels with the new Radeon DRM driver.
> >>
> >> Error log: https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.xenosoft.de%2FPuTTY_P5040_U-Boot.log&data=05%7C02%7Cchristophe.leroy%40csgroup.eu%7C9b40f906e2f2493cb25908dce211ee23%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C638633814783011669%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C60000%7C%7C%7C&sdata=fgAj0osIOyJtNrzUKp%2Bpq0NN1sGW2bqGm8nXYj88Ne0%3D&reserved=0
> >>
> >> Thanks,
> >> Christian