[REGRESSION] GM20B probe fails after commit 2541626cfb79

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Hello,

Commit 2541626cfb79 breaks GM20B probe with
the following kernel log:

[    2.153892] ------------[ cut here ]------------
[    2.153897] WARNING: CPU: 1 PID: 36 at drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmgf100.c:273 gf100_vmm_valid+0x2c4/0x390
[    2.153916] Modules linked in:
[    2.153922] CPU: 1 PID: 36 Comm: kworker/u8:1 Not tainted 6.1.0+ #1
[    2.153929] Hardware name: Google Pixel C (DT)
[    2.153933] Workqueue: events_unbound deferred_probe_work_func
[    2.153943] pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[    2.153950] pc : gf100_vmm_valid+0x2c4/0x390
[    2.153959] lr : gf100_vmm_valid+0xb4/0x390
[    2.153966] sp : ffffffc009e134b0
[    2.153969] x29: ffffffc009e134b0 x28: 0000000000000000 x27: ffffffc008fd44c8
[    2.153979] x26: 00000000ffffffea x25: ffffffc0087b98d0 x24: ffffff8080f89038
[    2.153987] x23: ffffff8081fadc08 x22: 0000000000000000 x21: 0000000000000000
[    2.153995] x20: ffffff8080f8a000 x19: ffffffc009e13678 x18: 0000000000000000
[    2.154003] x17: f37a8b93418958e6 x16: ffffffc009f0d000 x15: 0000000000000000
[    2.154011] x14: 0000000000000002 x13: 000000000003a020 x12: ffffffc008000000
[    2.154019] x11: 0000000102913000 x10: 0000000000000000 x9 : 0000000000000000
[    2.154026] x8 : ffffffc009e136d8 x7 : ffffffc008fd44c8 x6 : ffffff80803d0f00
[    2.154034] x5 : 0000000000000000 x4 : ffffff8080f88c00 x3 : 0000000000000010
[    2.154041] x2 : 000000000000000c x1 : 00000000ffffffea x0 : 00000000ffffffea
[    2.154050] Call trace:
[    2.154053]  gf100_vmm_valid+0x2c4/0x390
[    2.154061]  nvkm_vmm_map_valid+0xd4/0x204
[    2.154069]  nvkm_vmm_map_locked+0xa4/0x344
[    2.154076]  nvkm_vmm_map+0x50/0x84
[    2.154083]  nvkm_firmware_mem_map+0x84/0xc4
[    2.154094]  nvkm_falcon_fw_oneinit+0xc8/0x320
[    2.154101]  nvkm_acr_oneinit+0x428/0x5b0
[    2.154109]  nvkm_subdev_oneinit_+0x50/0x104
[    2.154114]  nvkm_subdev_init_+0x3c/0x12c
[    2.154119]  nvkm_subdev_init+0x60/0xa0
[    2.154125]  nvkm_device_init+0x14c/0x2a0
[    2.154133]  nvkm_udevice_init+0x60/0x9c
[    2.154140]  nvkm_object_init+0x48/0x1b0
[    2.154144]  nvkm_ioctl_new+0x168/0x254
[    2.154149]  nvkm_ioctl+0xd0/0x220
[    2.154153]  nvkm_client_ioctl+0x10/0x1c
[    2.154162]  nvif_object_ctor+0xf4/0x22c
[    2.154168]  nvif_device_ctor+0x28/0x70
[    2.154174]  nouveau_cli_init+0x150/0x590
[    2.154180]  nouveau_drm_device_init+0x60/0x2a0
[    2.154187]  nouveau_platform_device_create+0x90/0xd0
[    2.154193]  nouveau_platform_probe+0x3c/0x9c
[    2.154200]  platform_probe+0x68/0xc0
[    2.154207]  really_probe+0xbc/0x2dc
[    2.154211]  __driver_probe_device+0x78/0xe0
[    2.154216]  driver_probe_device+0xd8/0x160
[    2.154221]  __device_attach_driver+0xb8/0x134
[    2.154226]  bus_for_each_drv+0x78/0xd0
[    2.154230]  __device_attach+0x9c/0x1a0
[    2.154234]  device_initial_probe+0x14/0x20
[    2.154239]  bus_probe_device+0x98/0xa0
[    2.154243]  deferred_probe_work_func+0x88/0xc0
[    2.154247]  process_one_work+0x204/0x40c
[    2.154256]  worker_thread+0x230/0x450
[    2.154261]  kthread+0xc8/0xcc
[    2.154266]  ret_from_fork+0x10/0x20
[    2.154273] ---[ end trace 0000000000000000 ]---
[    2.154278] nouveau 57000000.gpu: pmu: map -22
[    2.154285] nouveau 57000000.gpu: acr: one-time init failed, -22
[    2.154559] nouveau 57000000.gpu: init failed with -22
[    2.154564] nouveau: DRM-master:00000000:00000080: init failed with -22
[    2.154574] nouveau 57000000.gpu: DRM-master: Device allocation failed: -22
[    2.162905] nouveau: probe of 57000000.gpu failed with error -22

#regzbot introduced: 2541626cfb79

Thanks,

Diogo Ivo



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