[PATCH 1/4] drm/etnaviv: Use scheduler dependency handling

[Michael Walle]

> We need to pull the drm_sched_job_init much earlier, but that's very
> minor surgery.

This patch breaks the GC7000 on the LS1028A:

[   35.671102] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000078
[   35.680925] Mem abort info:
[   35.685127]   ESR = 0x96000004
[   35.689583]   EC = 0x25: DABT (current EL), IL = 32 bits
[   35.696312]   SET = 0, FnV = 0
[   35.700766]   EA = 0, S1PTW = 0
[   35.705315]   FSC = 0x04: level 0 translation fault
[   35.711616] Data abort info:
[   35.715916]   ISV = 0, ISS = 0x00000004
[   35.721170]   CM = 0, WnR = 0
[   35.725552] user pgtable: 4k pages, 48-bit VAs, pgdp=0000002083f59000
[   35.733420] [0000000000000078] pgd=0000000000000000, p4d=0000000000000000
[   35.741627] Internal error: Oops: 96000004 [#1] SMP
[   35.747902] Modules linked in:
[   35.750963] CPU: 0 PID: 44 Comm: f0c0000.gpu Not tainted 5.18.0-rc2-00894-gde6a1d7294f5 #24
[   35.759345] Hardware name: Kontron KBox A-230-LS (DT)
[   35.764409] pstate: 00000005 (nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[   35.771394] pc : drm_sched_entity_select_rq+0x314/0x380
[   35.776645] lr : drm_sched_entity_pop_job+0x4c/0x480
[   35.781625] sp : ffff80000949bdb0
[   35.784943] x29: ffff80000949bdb0 x28: 0000000000000000 x27: 0000000000000000
[   35.792107] x26: ffff002003f09008 x25: ffff00200231d130 x24: ffff800008c13008
[   35.799270] x23: ffff8000086af900 x22: ffff800008c13008 x21: ffff002003fb6e00
[   35.806432] x20: 0000000000000040 x19: ffff002003f09008 x18: ffffffffffffffff
[   35.813594] x17: 0000000000000000 x16: 0000000000000000 x15: ffff800009ee3d48
[   35.820756] x14: 0000000000000000 x13: 0000000000000000 x12: ffffffff00000008
[   35.827918] x11: 0000aaaadb063d30 x10: 0000000000000960 x9 : ffff8000086afedc
[   35.835080] x8 : ffff00200186a900 x7 : 0000000000000000 x6 : 0000000000000000
[   35.842242] x5 : ffff00200231d2b0 x4 : 0000000000000000 x3 : 0000000000000000
[   35.849403] x2 : 0000000000000000 x1 : 0000000000000078 x0 : 0000000000000078
[   35.856565] Call trace:
[   35.859013]  drm_sched_entity_select_rq+0x314/0x380
[   35.863906]  drm_sched_main+0x1b0/0x49c
[   35.867752]  kthread+0xe4/0xf0
[   35.870814]  ret_from_fork+0x10/0x20
[   35.874401] Code: 8805fc24 35ffffa5 17fffef9 f9800031 (885f7c22) 
[   35.880513] ---[ end trace 0000000000000000 ]---

# glmark2-es2-drm
=======================================================
    glmark2 2021.02
=======================================================
    OpenGL Information
    GL_VENDOR:     etnaviv
    GL_RENDERER:   Vivante GC7000 rev 6202
    GL_VERSION:    OpenGL ES 2.0 Mesa 22.1.0-devel

Mesa is Lucas latest MR branch: lynxeye/etnaviv-gc7000-r6204.

Reverting this patch on drm-next will make the oops go away. Any idea
what's going wrong here?

-michael