Hi David Am 18.11.20 um 23:01 schrieb David Laight:
From: Thomas ZimmermannSent: 18 November 2020 19:37 Hi Am 18.11.20 um 19:10 schrieb Linus Torvalds:On Wed, Nov 18, 2020 at 4:12 AM David Laight <David.Laight@xxxxxxxxxx> wrote:I've got the 'splat' below during boot. This is an 8-core C2758 Atom cpu using the on-board/cpu graphics. User space is Ubuntu 20.04. Additionally the X display has all the colours and alignment slightly messed up. 5.9.0 was ok. I'm just guessing the two issues are related.Sounds likely. But it would be lovely if you could bisect when exactly the problem(s) started to both verify that, and just to pinpoint the exact change..I don't quite understand what 'git bisect' did. I was bisecting between v5.9 and v5.10-rc1 but it suddenly started generating v5.9.0-rc5+ kernels. The identified commit was 13a8f46d803 drm/ttm: move ghost object created. (retyped - hope it is right). But the diff to that last 'good' commit is massive. So I don't know if that is anywhere near right.
Did you try Daniel's suggestion of testing with the direct parent commit? Best regards Thomas
DavidI'm adding Thomas Zimmermann to the cc, because he did that "drm/ast: Program display mode in CRTC's atomic_enable" which looks relevant in that it's right in that call-chain. Did some initialization perhaps get overlooked? And Dave and Daniel and the drm list cc'd as well.. Full splat left quoted below for new people and list. Linus[ 20.809891] WARNING: CPU: 0 PID: 973 at drivers/gpu/drm/drm_gem_vram_helper.c:284drm_gem_vram_offset+0x35/0x40 [drm_vram_helper] That line is at [1], which comes from 46642a7d4d80 ("drm/vram-helper: don't use ttm bo->offset v4") But the patch was merged in 5.9-rc1, so it's probably something else. We've had a lot of TTM-related changes recently, so my best guess is that it's something in TTM with BO initialization. From some grepping, it looks like we have to call ttm_bo_mem_space() to fill mm_node (i.e., the pointer that causes the warning). But I cannot find where vram helpers do this. Maybe that's a good starting point. I'm adding the TTM devs to cc. Best regards Thomas [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/drm_gem_vram_h elper.c?h=v5.10-rc4#n284[ 20.821543] Modules linked in: nls_iso8859_1 dm_multipath scsi_dh_rdac scsi_dh_emc scsi_dh_aluaipmi_ssif intel_powerclamp coretemp kvm_intel kvm joydev input_leds ipmi_si intel_cstate ipmi_devintf ipmi_msghandler mac_hid sch_fq_codel parport_pc ppdev lp parport ip_tables x_tables autofs4 btrfs blake2b_generic zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx libcrc32c xor raid6_pq raid1 raid0 multipath linear ast drm_vram_helper drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops cec drm_ttm_helper ttm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel gpio_ich drm aesni_intel hid_generic glue_helper crypto_simd igb usbhid cryptd ahci i2c_i801 hid libahci i2c_smbus lpc_ich dca i2c_ismt i2c_algo_bit[ 20.887477] CPU: 0 PID: 973 Comm: gnome-shell Not tainted 5.10.0-rc4+ #78 [ 20.894274] Hardware name: Supermicro A1SAi/A1SRi, BIOS 1.1a 08/27/2015 [ 20.900896] RIP: 0010:drm_gem_vram_offset+0x35/0x40 [drm_vram_helper] [ 20.907342] Code: 00 48 89 e5 85 c0 74 17 48 83 bf 78 01 00 00 00 74 18 48 8b 87 80 01 00 00 5d48 c1 e0 0c c3 0f 0b 48 c7 c0 ed ff ff ff 5d c3 <0f> 0b 31 c0 5d c3 0f 1f 44 00 00 0f 1f 44 00 00 55 48 8b 87 18 06[ 20.926100] RSP: 0018:ffff9f59811d3a68 EFLAGS: 00010246 [ 20.931339] RAX: 0000000000000002 RBX: ffff8b46861e20c0 RCX: ffffffffc032d600 [ 20.938479] RDX: ffff8b468f47a000 RSI: ffff8b46861e2000 RDI: ffff8b468f9acc00 [ 20.945622] RBP: ffff9f59811d3a68 R08: 0000000000000040 R09: ffff8b46864ce288 [ 20.952769] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8b468f47a000 [ 20.959915] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8b468ad2bf00 [ 20.967057] FS: 00007f5b37ac5cc0(0000) GS:ffff8b49efc00000(0000) knlGS:0000000000000000 [ 20.975149] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 20.980904] CR2: 00007f5b3d093f00 CR3: 0000000103438000 CR4: 00000000001006f0 [ 20.988047] Call Trace: [ 20.990506] ast_cursor_page_flip+0x22/0x100 [ast] [ 20.995313] ast_cursor_plane_helper_atomic_update+0x46/0x70 [ast] [ 21.001524] drm_atomic_helper_commit_planes+0xbd/0x220 [drm_kms_helper] [ 21.008243] drm_atomic_helper_commit_tail_rpm+0x3a/0x70 [drm_kms_helper] [ 21.015062] commit_tail+0x99/0x130 [drm_kms_helper] [ 21.020050] drm_atomic_helper_commit+0x123/0x150 [drm_kms_helper] [ 21.026269] drm_atomic_commit+0x4a/0x50 [drm] [ 21.030737] drm_atomic_helper_update_plane+0xe7/0x140 [drm_kms_helper] [ 21.037384] __setplane_atomic+0xcc/0x110 [drm] [ 21.041953] drm_mode_cursor_universal+0x13e/0x260 [drm] [ 21.047299] drm_mode_cursor_common+0xef/0x220 [drm] [ 21.052287] ? alloc_set_pte+0x10d/0x6d0 [ 21.056244] ? drm_mode_cursor_ioctl+0x60/0x60 [drm] [ 21.061242] drm_mode_cursor2_ioctl+0xe/0x10 [drm] [ 21.066067] drm_ioctl_kernel+0xae/0xf0 [drm] [ 21.070455] drm_ioctl+0x241/0x3f0 [drm] [ 21.074415] ? drm_mode_cursor_ioctl+0x60/0x60 [drm] [ 21.079401] __x64_sys_ioctl+0x91/0xc0 [ 21.083167] do_syscall_64+0x38/0x90 [ 21.086755] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 21.091813] RIP: 0033:0x7f5b3cf1350b [ 21.095403] Code: 0f 1e fa 48 8b 05 85 39 0d 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 660f 1f 44 00 00 f3 0f 1e fa b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 55 39 0d 00 f7 d8 64 89 01 48[ 21.114154] RSP: 002b:00007ffef1966588 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 21.121730] RAX: ffffffffffffffda RBX: 00007ffef19665c0 RCX: 00007f5b3cf1350b [ 21.128870] RDX: 00007ffef19665c0 RSI: 00000000c02464bb RDI: 0000000000000009 [ 21.136013] RBP: 00000000c02464bb R08: 0000000000000040 R09: 0000000000000004 [ 21.143157] R10: 0000000000000002 R11: 0000000000000246 R12: 0000561ec9d10060 [ 21.150295] R13: 0000000000000009 R14: 0000561eca2cc9a0 R15: 0000000000000040-- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 Nürnberg, Germany (HRB 36809, AG Nürnberg) Geschäftsführer: Felix Imendörffer- Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales) _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
-- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 Nürnberg, Germany (HRB 36809, AG Nürnberg) Geschäftsführer: Felix Imendörffer
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