[Bug 106258] AMD Xorg start failes with non-4K page sizes

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106258

--- Comment #34 from Ben Crocker <bcrocker at redhat.com> ---
Things start to go haywire at 246.305790, which appears to be the first time
the do-loop in amdgpu_vm_bo_update_mapping executes more than once.
The value of max_entries is obviously absurd; a little later, the value of
start (0x104000) is consistent with the first trip through the loop, but
the value of last (0xe5fff) looks wrong, starting with the fact that it
is LESS than start.

[  246.305139] [drm] amdgpu_vm_bo_split_mapping nodes->size=512 pfn=0
max_entries=8192
[  246.305230] [drm] amdgpu_vm_bo_split_mapping: addr=0x1e2000000
vram_base_offset=0x0
[  246.305322] [drm] amdgpu_vm_bo_split_mapping: start=0x102000 last=0x103fff
[  246.305400] [drm] amdgpu_vm_bo_update_mapping l.1304: ndw=64 ncmds=9
fragment_size=9
[  246.305474] [drm] amdgpu_vm_bo_update_mapping l.1310: resulting ndw=334
[  246.305533] [drm] amdgpu_vm_bo_update_mapping calls
amdgpu_job_alloc_with_ib(..., ndw*4 = 1336 (00000538))
[  246.305630] [drm] amdgpu_job_alloc_with_ib calls amdgpu_ib_get(...,
size=1336 (00000538))
[  246.305704] [drm] amdgpu_ib_get calls amdgpu_sa_bo_new(..., size=1336
(00000538), align=256
Things go haywire:
[  246.305790] [drm] amdgpu_vm_bo_split_mapping nodes->size=512 pfn=8192
max_entries=18446744073709428736
[  246.305878] [drm] amdgpu_vm_bo_split_mapping: addr=0x1e2000000
vram_base_offset=0x0
[  246.305970] [drm] amdgpu_vm_bo_split_mapping: start=0x104000 last=0xe5fff
[  246.306029] [drm] amdgpu_vm_bo_update_mapping l.1304: ndw=64 ncmds=4194185
fragment_size=9
[  246.306111] [drm] amdgpu_vm_bo_update_mapping l.1310: resulting ndw=41942094
[  246.306197] [drm] amdgpu_vm_bo_update_mapping calls
amdgpu_job_alloc_with_ib(..., ndw*4 = 167768376 (09FFF138))
[  246.306322] [drm] amdgpu_job_alloc_with_ib calls amdgpu_ib_get(...,
size=167768376 (09fff138))
[  246.306429] [drm] amdgpu_ib_get calls amdgpu_sa_bo_new(..., size=167768376
(09fff138), align=256
[  246.306571] WARNING: CPU: 67 PID: 21839 at amdgpu_sa_bo_new+0x628/0x6b0
[amdgpu]
[  246.306645] Modules linked in: binfmt_misc ext4 crc16 mbcache jbd2 fscrypto
evdev snd_usb_audio amdgpu snd_usbmidi_lib snd_rawmidi snd_seq_device
ghash_generic gf128mul ecb xts ctr snd_hda_codec_hdmi chash ast gpu_sched cbc
ttm snd_hda_intel vmx_crypto snd_hda_codec drm_kms_helper snd_hda_core drm
snd_hwdep snd_pcm snd_timer ofpart drm_panel_orientation_quirks syscopyarea snd
sysfillrect ipmi_powernv sysimgblt fb_sys_fops ipmi_devintf i2c_algo_bit sg
powernv_flash soundcore mtd ipmi_msghandler opal_prd at24 sunrpc ecryptfs
ip_tables x_tables autofs4 zfs(PO) zunicode(PO) zavl(PO) icp(PO) zcommon(PO)
znvpair(PO) spl(O) raid10 raid456 async_raid6_recov async_memcpy async_pq
async_xor async_tx hid_generic usbhid hid xor raid6_pq libcrc32c crc32c_generic
raid1 raid0 multipath linear sd_mod md_mod ses

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