| Summary: | failed to create kernel channel, -12 on G4 PPC | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Product: | xorg | Reporter: | Stefan de Konink <stefan> | ||||||||
| Component: | Driver/nouveau | Assignee: | Nouveau Project <nouveau> | ||||||||
| Status: | RESOLVED FIXED | QA Contact: | Xorg Project Team <xorg-team> | ||||||||
| Severity: | normal | ||||||||||
| Priority: | medium | CC: | florian | ||||||||
| Version: | git | ||||||||||
| Hardware: | PowerPC | ||||||||||
| OS: | Linux (All) | ||||||||||
| Whiteboard: | |||||||||||
| i915 platform: | i915 features: | ||||||||||
| Attachments: |
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Created attachment 72185 [details]
dmesg including debugging
What we found so far: Acceleration set up fails like that: Stacktrace: nouveau_drm_load nouveau_accel_init nouveau_channel_new nouveau_channel_ind nouveau_channel_prep nouveau_bo_map ttm_bo_kmap ttm_bo_ioremap ioremap_wc ioremap_wc returns NULL. bo->mem.bus.base and bo->mem.bus.offset are 0. Probably because of this code: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=blob;f=drivers/char/agp/uninorth-agp.c;h=a32c492baf5cc15001ad6882dc25a14d1be86419;hb=29594404d7fe73cd80eaa4ee8c43dcc53970c60e#l125 and ioremap fails because of this: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=blob;f=arch/powerpc/mm/pgtable_32.c;h=6c856fb8c15b01705fb6cf5ff28c0a232d85d3bd;hb=29594404d7fe73cd80eaa4ee8c43dcc53970c60e#l204 Booting with nouveau.agpmode=0 works. Created attachment 72187 [details]
dmesg for linux 3.6.6
I confirm that the fix works on 3.8-rc1 This fix just hit Linus' tree. A patch referencing this bug report has been merged in Linux v3.8-rc3: commit eda85d6ad490923152544fba0473798b6cc0edf6 Author: Aaro Koskinen <aaro.koskinen@iki.fi> Date: Mon Dec 31 03:34:59 2012 +0200 drm/nouveau: fix init with agpgart-uninorth |
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Created attachment 72184 [details] Bisecting between v3.6 and v3.7 The v3.7 version of nouveau fails to set up acceleration, while it does work for v3.6. We have tried to bisect the problem but stubled on a change we cannot beyond: git show 77145f1cbdf8d28b46ff8070ca749bad821e0774 -- drivers/gpu/drm/nouveau/core/subdev/bios/base.c