Re: [PATCH v3 6/7] drm: Validate encoder->possible_crtcs

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On 11.02.20 18:04, Daniel Vetter wrote:
> On Tue, Feb 11, 2020 at 06:22:07PM +0200, Ville Syrjala wrote:
>> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
>>
>> WARN if the encoder possible_crtcs is effectively empty or contains
>> bits for non-existing crtcs.
>>
>> v2: Move to drm_mode_config_validate() (Daniel)
>>     Make the docs say we WARN when this is wrong (Daniel)
>>     Extract full_crtc_mask()
>>
>> Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
>> Cc: Daniel Vetter <daniel@xxxxxxxx>
>> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> 
> When pushing the fixup needs to be applied before the validation patch
> here, because we don't want to anger the bisect gods.
> 
> Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> 
> I think with the fixup we should be good enough with the existing nonsense
> in drivers. Fingers crossed.
> -Daniel
> 
> 
>> ---
>>  drivers/gpu/drm/drm_mode_config.c | 27 ++++++++++++++++++++++++++-
>>  include/drm/drm_encoder.h         |  2 +-
>>  2 files changed, 27 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c
>> index afc91447293a..4c1b350ddb95 100644
>> --- a/drivers/gpu/drm/drm_mode_config.c
>> +++ b/drivers/gpu/drm/drm_mode_config.c
>> @@ -581,6 +581,29 @@ static void validate_encoder_possible_clones(struct drm_encoder *encoder)
>>  	     encoder->possible_clones, encoder_mask);
>>  }
>>  
>> +static u32 full_crtc_mask(struct drm_device *dev)
>> +{
>> +	struct drm_crtc *crtc;
>> +	u32 crtc_mask = 0;
>> +
>> +	drm_for_each_crtc(crtc, dev)
>> +		crtc_mask |= drm_crtc_mask(crtc);
>> +
>> +	return crtc_mask;
>> +}
>> +
>> +static void validate_encoder_possible_crtcs(struct drm_encoder *encoder)
>> +{
>> +	u32 crtc_mask = full_crtc_mask(encoder->dev);
>> +
>> +	WARN((encoder->possible_crtcs & crtc_mask) == 0 ||
>> +	     (encoder->possible_crtcs & ~crtc_mask) != 0,
>> +	     "Bogus possible_crtcs: "
>> +	     "[ENCODER:%d:%s] possible_crtcs=0x%x (full crtc mask=0x%x)\n",
>> +	     encoder->base.id, encoder->name,
>> +	     encoder->possible_crtcs, crtc_mask);
>> +}
>> +
>>  void drm_mode_config_validate(struct drm_device *dev)
>>  {
>>  	struct drm_encoder *encoder;
>> @@ -588,6 +611,8 @@ void drm_mode_config_validate(struct drm_device *dev)
>>  	drm_for_each_encoder(encoder, dev)
>>  		fixup_encoder_possible_clones(encoder);
>>  
>> -	drm_for_each_encoder(encoder, dev)
>> +	drm_for_each_encoder(encoder, dev) {
>>  		validate_encoder_possible_clones(encoder);
>> +		validate_encoder_possible_crtcs(encoder);
>> +	}
>>  }
>> diff --git a/include/drm/drm_encoder.h b/include/drm/drm_encoder.h
>> index 3741963b9587..b236269f41ac 100644
>> --- a/include/drm/drm_encoder.h
>> +++ b/include/drm/drm_encoder.h
>> @@ -142,7 +142,7 @@ struct drm_encoder {
>>  	 * the bits for all &drm_crtc objects this encoder can be connected to
>>  	 * before calling drm_dev_register().
>>  	 *
>> -	 * In reality almost every driver gets this wrong.
>> +	 * You will get a WARN if you get this wrong in the driver.
>>  	 *
>>  	 * Note that since CRTC objects can't be hotplugged the assigned indices
>>  	 * are stable and hence known before registering all objects.
>> -- 
>> 2.24.1
>>
> 

Triggers on an Advantech AIMB-228 (R1505G, 3 DP outputs):

[   14.033246] ------------[ cut here ]------------
[   14.033248] Bogus possible_crtcs: [ENCODER:65:TMDS-65] possible_crtcs=0xf (full crtc mask=0x7)
[   14.033279] WARNING: CPU: 0 PID: 282 at ../drivers/gpu/drm/drm_mode_config.c:622 drm_mode_config_validate+0x17d/0x200 [drm]
[   14.033279] Modules linked in: amdgpu(E+) mfd_core(E) snd_hda_codec_realtek(E) kvm_amd(E) gpu_sched(E) i2c_algo_bit(E) ttm(E) snd_hda_codec_generic(E) kvm(E) ledtrig_audio(E) snd_hda_codec_hdmi(E) drm_kms_helper(E) snd_hda_intel(E) snd_intel_dspcfg(E) snd_hda_codec(E) cec(E) snd_hwdep(E) drm(E) irqbypass(E) snd_hda_core(E) crc32_pclmul(E) snd_pcm(E) ghash_clmulni_intel(E) snd_timer(E) sg(E) aesni_intel(E) snd(E) ccp(E) soundcore(E) rng_core(E) glue_helper(E) libaes(E) crypto_simd(E) k10temp(E) efi_pstore(E) sp5100_tco(E) evdev(E) cryptd(E) pcspkr(E) efivars(E) video(E) button(E) acpi_cpufreq(E) w83627hf_wdt(E) watchdog(E) nct6775(E) hwmon_vid(E) efivarfs(E) ip_tables(E) x_tables(E) autofs4(E) ext4(E) crc32c_generic(E) crc16(E) mbcache(E) jbd2(E) sd_mod(E) t10_pi(E) crc_t10dif(E) crct10dif_generic(E) uas(E) usb_storage(E) ahci(E) libahci(E) xhci_pci(E) r8169(E) realtek(E) mdio_devres(E) xhci_hcd(E) libata(E) i2c_amd_mp2_pci(E) crct10dif_pclmul(E) crct10dif_common(E) scsi_mod(E)
[   14.033306]  crc32c_intel(E) i2c_piix4(E) usbcore(E) libphy(E)
[   14.033310] CPU: 0 PID: 282 Comm: systemd-udevd Tainted: G            E     5.9.0-rc3+ #2
[   14.033311] Hardware name: Default string Default string/Default string, BIOS 5.0.1.4 02/14/2020
[   14.033324] RIP: 0010:drm_mode_config_validate+0x17d/0x200 [drm]
[   14.033327] Code: 42 f0 75 e6 41 85 f8 74 09 44 89 c0 f7 d0 85 f8 74 1a 49 8b 54 24 38 41 8b 74 24 18 89 f9 48 c7 c7 80 7d 70 c0 e8 13 66 9a d5 <0f> 0b 49 8b 44 24 08 49 39 c5 4c 8d 60 f8 0f 85 e9 fe ff ff 5b 5d
[   14.033328] RSP: 0018:ffffae5f404b7a90 EFLAGS: 00010282
[   14.033329] RAX: 0000000000000000 RBX: ffff9c6907bd0ad0 RCX: 0000000000000027
[   14.033330] RDX: 0000000000000000 RSI: 0000000000000086 RDI: ffff9c6910a18ac8
[   14.033331] RBP: 0000000000000001 R08: 0000000000000064 R09: ffffffff9784a724
[   14.033331] R10: 0000000000000001 R11: 0000000000000000 R12: ffff9c690bf8b800
[   14.033332] R13: ffff9c6907bd0ad8 R14: ffff9c6907bd0ad8 R15: 000000000000003f
[   14.033333] FS:  00007feace9d4d40(0000) GS:ffff9c6910a00000(0000) knlGS:0000000000000000
[   14.033334] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   14.033335] CR2: 0000557a37b7e270 CR3: 000000038d5fa000 CR4: 00000000003506f0
[   14.033335] Call Trace:
[   14.033350]  drm_dev_register+0x117/0x1e0 [drm]
[   14.033423]  amdgpu_pci_probe+0x134/0x200 [amdgpu]
[   14.033428]  local_pci_probe+0x42/0x90
[   14.033430]  pci_device_probe+0x108/0x1c0
[   14.033433]  really_probe+0xef/0x4a0
[   14.033435]  driver_probe_device+0xde/0x150
[   14.033436]  device_driver_attach+0x4f/0x60
[   14.033438]  __driver_attach+0x9a/0x140
[   14.033439]  ? device_driver_attach+0x60/0x60
[   14.033441]  bus_for_each_dev+0x76/0xc0
[   14.033443]  ? klist_add_tail+0x3b/0x70
[   14.033445]  bus_add_driver+0x144/0x220
[   14.033446]  ? 0xffffffffc0949000
[   14.033447]  driver_register+0x5b/0xf0
[   14.033448]  ? 0xffffffffc0949000
[   14.033451]  do_one_initcall+0x46/0x1f4
[   14.033454]  ? _cond_resched+0x15/0x40
[   14.033456]  ? kmem_cache_alloc_trace+0x40/0x440
[   14.033459]  ? do_init_module+0x22/0x213
[   14.033460]  do_init_module+0x5b/0x213
[   14.033462]  load_module+0x258c/0x2d30
[   14.033465]  ? __kernel_read+0xf5/0x160
[   14.033467]  ? __do_sys_finit_module+0xe9/0x110
[   14.033468]  __do_sys_finit_module+0xe9/0x110
[   14.033471]  do_syscall_64+0x33/0x80
[   14.033473]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   14.033474] RIP: 0033:0x7feacf1bef59
[   14.033477] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 07 6f 0c 00 f7 d8 64 89 01 48
[   14.033477] RSP: 002b:00007ffd03534438 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[   14.033478] RAX: ffffffffffffffda RBX: 0000565489749410 RCX: 00007feacf1bef59
[   14.033479] RDX: 0000000000000000 RSI: 00007feacf0c3cad RDI: 0000000000000015
[   14.033479] RBP: 00007feacf0c3cad R08: 0000000000000000 R09: 0000000000000000
[   14.033480] R10: 0000000000000015 R11: 0000000000000246 R12: 0000000000000000
[   14.033480] R13: 00005654897472c0 R14: 0000000000020000 R15: 0000565489749410
[   14.033482] ---[ end trace 16aeaa08847a13d8 ]---
[   14.033483] ------------[ cut here ]------------
[   14.033484] Bogus possible_crtcs: [ENCODER:69:TMDS-69] possible_crtcs=0xf (full crtc mask=0x7)
[   14.033507] WARNING: CPU: 0 PID: 282 at ../drivers/gpu/drm/drm_mode_config.c:622 drm_mode_config_validate+0x17d/0x200 [drm]
[   14.033507] Modules linked in: amdgpu(E+) mfd_core(E) snd_hda_codec_realtek(E) kvm_amd(E) gpu_sched(E) i2c_algo_bit(E) ttm(E) snd_hda_codec_generic(E) kvm(E) ledtrig_audio(E) snd_hda_codec_hdmi(E) drm_kms_helper(E) snd_hda_intel(E) snd_intel_dspcfg(E) snd_hda_codec(E) cec(E) snd_hwdep(E) drm(E) irqbypass(E) snd_hda_core(E) crc32_pclmul(E) snd_pcm(E) ghash_clmulni_intel(E) snd_timer(E) sg(E) aesni_intel(E) snd(E) ccp(E) soundcore(E) rng_core(E) glue_helper(E) libaes(E) crypto_simd(E) k10temp(E) efi_pstore(E) sp5100_tco(E) evdev(E) cryptd(E) pcspkr(E) efivars(E) video(E) button(E) acpi_cpufreq(E) w83627hf_wdt(E) watchdog(E) nct6775(E) hwmon_vid(E) efivarfs(E) ip_tables(E) x_tables(E) autofs4(E) ext4(E) crc32c_generic(E) crc16(E) mbcache(E) jbd2(E) sd_mod(E) t10_pi(E) crc_t10dif(E) crct10dif_generic(E) uas(E) usb_storage(E) ahci(E) libahci(E) xhci_pci(E) r8169(E) realtek(E) mdio_devres(E) xhci_hcd(E) libata(E) i2c_amd_mp2_pci(E) crct10dif_pclmul(E) crct10dif_common(E) scsi_mod(E)
[   14.033522]  crc32c_intel(E) i2c_piix4(E) usbcore(E) libphy(E)
[   14.033524] CPU: 0 PID: 282 Comm: systemd-udevd Tainted: G        W   E     5.9.0-rc3+ #2
[   14.033525] Hardware name: Default string Default string/Default string, BIOS 5.0.1.4 02/14/2020
[   14.033538] RIP: 0010:drm_mode_config_validate+0x17d/0x200 [drm]
[   14.033539] Code: 42 f0 75 e6 41 85 f8 74 09 44 89 c0 f7 d0 85 f8 74 1a 49 8b 54 24 38 41 8b 74 24 18 89 f9 48 c7 c7 80 7d 70 c0 e8 13 66 9a d5 <0f> 0b 49 8b 44 24 08 49 39 c5 4c 8d 60 f8 0f 85 e9 fe ff ff 5b 5d
[   14.033540] RSP: 0018:ffffae5f404b7a90 EFLAGS: 00010282
[   14.033540] RAX: 0000000000000000 RBX: ffff9c6907bd0ad0 RCX: 0000000000000027
[   14.033541] RDX: 0000000000000000 RSI: 0000000000000086 RDI: ffff9c6910a18ac8
[   14.033542] RBP: 0000000000000001 R08: 0000000000000064 R09: ffffffff9784a724
[   14.033542] R10: 0000000000000001 R11: 0000000000000000 R12: ffff9c690bf89800
[   14.033543] R13: ffff9c6907bd0ad8 R14: ffff9c6907bd0ad8 R15: 000000000000003f
[   14.033544] FS:  00007feace9d4d40(0000) GS:ffff9c6910a00000(0000) knlGS:0000000000000000
[   14.033544] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   14.033545] CR2: 0000557a37b7e270 CR3: 000000038d5fa000 CR4: 00000000003506f0
[   14.033545] Call Trace:
[   14.033557]  drm_dev_register+0x117/0x1e0 [drm]
[   14.033625]  amdgpu_pci_probe+0x134/0x200 [amdgpu]
[   14.033627]  local_pci_probe+0x42/0x90
[   14.033629]  pci_device_probe+0x108/0x1c0
[   14.033630]  really_probe+0xef/0x4a0
[   14.033632]  driver_probe_device+0xde/0x150
[   14.033633]  device_driver_attach+0x4f/0x60
[   14.033634]  __driver_attach+0x9a/0x140
[   14.033635]  ? device_driver_attach+0x60/0x60
[   14.033636]  bus_for_each_dev+0x76/0xc0
[   14.033638]  ? klist_add_tail+0x3b/0x70
[   14.033639]  bus_add_driver+0x144/0x220
[   14.033640]  ? 0xffffffffc0949000
[   14.033641]  driver_register+0x5b/0xf0
[   14.033642]  ? 0xffffffffc0949000
[   14.033643]  do_one_initcall+0x46/0x1f4
[   14.033645]  ? _cond_resched+0x15/0x40
[   14.033646]  ? kmem_cache_alloc_trace+0x40/0x440
[   14.033648]  ? do_init_module+0x22/0x213
[   14.033649]  do_init_module+0x5b/0x213
[   14.033650]  load_module+0x258c/0x2d30
[   14.033652]  ? __kernel_read+0xf5/0x160
[   14.033654]  ? __do_sys_finit_module+0xe9/0x110
[   14.033655]  __do_sys_finit_module+0xe9/0x110
[   14.033657]  do_syscall_64+0x33/0x80
[   14.033659]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   14.033660] RIP: 0033:0x7feacf1bef59
[   14.033661] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 07 6f 0c 00 f7 d8 64 89 01 48
[   14.033662] RSP: 002b:00007ffd03534438 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[   14.033663] RAX: ffffffffffffffda RBX: 0000565489749410 RCX: 00007feacf1bef59
[   14.033663] RDX: 0000000000000000 RSI: 00007feacf0c3cad RDI: 0000000000000015
[   14.033664] RBP: 00007feacf0c3cad R08: 0000000000000000 R09: 0000000000000000
[   14.033664] R10: 0000000000000015 R11: 0000000000000246 R12: 0000000000000000
[   14.033665] R13: 00005654897472c0 R14: 0000000000020000 R15: 0000565489749410
[   14.033666] ---[ end trace 16aeaa08847a13d9 ]---
[   14.033667] ------------[ cut here ]------------
[   14.033668] Bogus possible_crtcs: [ENCODER:73:TMDS-73] possible_crtcs=0xf (full crtc mask=0x7)
[   14.033690] WARNING: CPU: 0 PID: 282 at ../drivers/gpu/drm/drm_mode_config.c:622 drm_mode_config_validate+0x17d/0x200 [drm]
[   14.033690] Modules linked in: amdgpu(E+) mfd_core(E) snd_hda_codec_realtek(E) kvm_amd(E) gpu_sched(E) i2c_algo_bit(E) ttm(E) snd_hda_codec_generic(E) kvm(E) ledtrig_audio(E) snd_hda_codec_hdmi(E) drm_kms_helper(E) snd_hda_intel(E) snd_intel_dspcfg(E) snd_hda_codec(E) cec(E) snd_hwdep(E) drm(E) irqbypass(E) snd_hda_core(E) crc32_pclmul(E) snd_pcm(E) ghash_clmulni_intel(E) snd_timer(E) sg(E) aesni_intel(E) snd(E) ccp(E) soundcore(E) rng_core(E) glue_helper(E) libaes(E) crypto_simd(E) k10temp(E) efi_pstore(E) sp5100_tco(E) evdev(E) cryptd(E) pcspkr(E) efivars(E) video(E) button(E) acpi_cpufreq(E) w83627hf_wdt(E) watchdog(E) nct6775(E) hwmon_vid(E) efivarfs(E) ip_tables(E) x_tables(E) autofs4(E) ext4(E) crc32c_generic(E) crc16(E) mbcache(E) jbd2(E) sd_mod(E) t10_pi(E) crc_t10dif(E) crct10dif_generic(E) uas(E) usb_storage(E) ahci(E) libahci(E) xhci_pci(E) r8169(E) realtek(E) mdio_devres(E) xhci_hcd(E) libata(E) i2c_amd_mp2_pci(E) crct10dif_pclmul(E) crct10dif_common(E) scsi_mod(E)
[   14.033704]  crc32c_intel(E) i2c_piix4(E) usbcore(E) libphy(E)
[   14.033706] CPU: 0 PID: 282 Comm: systemd-udevd Tainted: G        W   E     5.9.0-rc3+ #2
[   14.033707] Hardware name: Default string Default string/Default string, BIOS 5.0.1.4 02/14/2020
[   14.033719] RIP: 0010:drm_mode_config_validate+0x17d/0x200 [drm]
[   14.033721] Code: 42 f0 75 e6 41 85 f8 74 09 44 89 c0 f7 d0 85 f8 74 1a 49 8b 54 24 38 41 8b 74 24 18 89 f9 48 c7 c7 80 7d 70 c0 e8 13 66 9a d5 <0f> 0b 49 8b 44 24 08 49 39 c5 4c 8d 60 f8 0f 85 e9 fe ff ff 5b 5d
[   14.033721] RSP: 0018:ffffae5f404b7a90 EFLAGS: 00010282
[   14.033722] RAX: 0000000000000000 RBX: ffff9c6907bd0ad0 RCX: 0000000000000027
[   14.033723] RDX: 0000000000000000 RSI: 0000000000000086 RDI: ffff9c6910a18ac8
[   14.033723] RBP: 0000000000000001 R08: 0000000000000064 R09: ffffffff9784a724
[   14.033724] R10: 0000000000000001 R11: 0000000000000000 R12: ffff9c690bf7c000
[   14.033724] R13: ffff9c6907bd0ad8 R14: ffff9c6907bd0ad8 R15: 000000000000003f
[   14.033725] FS:  00007feace9d4d40(0000) GS:ffff9c6910a00000(0000) knlGS:0000000000000000
[   14.033726] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   14.033726] CR2: 0000557a37b7e270 CR3: 000000038d5fa000 CR4: 00000000003506f0
[   14.033727] Call Trace:
[   14.033739]  drm_dev_register+0x117/0x1e0 [drm]
[   14.033806]  amdgpu_pci_probe+0x134/0x200 [amdgpu]
[   14.033808]  local_pci_probe+0x42/0x90
[   14.033810]  pci_device_probe+0x108/0x1c0
[   14.033811]  really_probe+0xef/0x4a0
[   14.033813]  driver_probe_device+0xde/0x150
[   14.033814]  device_driver_attach+0x4f/0x60
[   14.033815]  __driver_attach+0x9a/0x140
[   14.033816]  ? device_driver_attach+0x60/0x60
[   14.033817]  bus_for_each_dev+0x76/0xc0
[   14.033818]  ? klist_add_tail+0x3b/0x70
[   14.033820]  bus_add_driver+0x144/0x220
[   14.033821]  ? 0xffffffffc0949000
[   14.033822]  driver_register+0x5b/0xf0
[   14.033823]  ? 0xffffffffc0949000
[   14.033824]  do_one_initcall+0x46/0x1f4
[   14.033825]  ? _cond_resched+0x15/0x40
[   14.033827]  ? kmem_cache_alloc_trace+0x40/0x440
[   14.033828]  ? do_init_module+0x22/0x213
[   14.033829]  do_init_module+0x5b/0x213
[   14.033831]  load_module+0x258c/0x2d30
[   14.033833]  ? __kernel_read+0xf5/0x160
[   14.033834]  ? __do_sys_finit_module+0xe9/0x110
[   14.033835]  __do_sys_finit_module+0xe9/0x110
[   14.033838]  do_syscall_64+0x33/0x80
[   14.033839]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   14.033840] RIP: 0033:0x7feacf1bef59
[   14.033841] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 07 6f 0c 00 f7 d8 64 89 01 48
[   14.033842] RSP: 002b:00007ffd03534438 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[   14.033843] RAX: ffffffffffffffda RBX: 0000565489749410 RCX: 00007feacf1bef59
[   14.033843] RDX: 0000000000000000 RSI: 00007feacf0c3cad RDI: 0000000000000015
[   14.033844] RBP: 00007feacf0c3cad R08: 0000000000000000 R09: 0000000000000000
[   14.033844] R10: 0000000000000015 R11: 0000000000000246 R12: 0000000000000000
[   14.033845] R13: 00005654897472c0 R14: 0000000000020000 R15: 0000565489749410
[   14.033846] ---[ end trace 16aeaa08847a13da ]---

Probably the same issue as in
https://bugzilla.kernel.org/show_bug.cgi?id=209123. What does it 
practically mean? Can/should it be silenced in this setup?

Jan
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