Message-ID: <ghlfh0s2id.fsf@gouders.net>
Date:   Wed, 23 Sep 2020 21:43:06 +0200
From:   Dirk Gouders <dirk@...ders.net>
To:     Alex Deucher <alexdeucher@...il.com>
Cc:     Felix Kuehling <Felix.Kuehling@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>
Subject: Re: amdgpu: call trace introduced in 5.9-rc1 for Lenovo L14 Renoir

Dirk Gouders <dirk@...ders.net> writes:

> Alex Deucher <alexdeucher@...il.com> writes:
>
>> On Wed, Sep 23, 2020 at 8:54 AM Dirk Gouders <dirk@...ders.net> wrote:
>>>
>>> Dirk Gouders <dirk@...ders.net> writes:
>>>
>>> > Hi,
>>> >
>>> > I noticed a call trace (attached) when starting my machine (ThinkPad
>>> > L14).  This machine is new and I am still working on it's
>>> > configuration but visually noticeable is that scrolling in xterms with
>>> > SHIFT-PgUp/PgDn is broken.  Using the mouse wheel works.
>>> >
>>> > It seems the call trace has been introduced between 5.8 and 5.9-rc1 and
>>> > I tried to bisect this but always end in situations where I dont't find
>>> > a bootable commit around the current bisect position.  Mainly the
>>> > machine then hangs when udevd is started.
>>>
>>> I fixed my netconsole setup (had to use a switch instead of the
>>> ports of a FritzBox) and tried a bisect, again (log below).  With the
>>> commits between the earliest bad and latest good commits I marked, my
>>> machine does not boot and hangs very early with the message:
>>>
>>>         fb0: switching to amdgpudrmfb from EFI VGA
>>>
>>> That was introduced with
>>>
>>>         c1cf79ca5ced drm/amdgpu: use IP discovery table for renoir
>>>
>>> and ended with a commit that instead produces the call trace
>>>
>>>         b6df946ef4b5 drm/amdgpu: fix the nullptr issue as for PWR IP not
>>>                      existing in discovery table
>>>
>>> I was hoping to get further with the bisect but have no idea how to
>>> avoid the early hangs.
>>
>> You can disable use of the IP discovery table by setting
>> amdgpu.discovery=0 on the kernel command line in grub.
>
> I tried that with b770f04ba2ee (next step in bisect), but no success
> with this option, unfortunately.
>
> I'm not using grub but directly booting from UEFI using CONFIG_CMDLINE.
> Any other option I am using (root, loglevel and netconsole) works as
> expected and I veryfied that "amdgpu.discovery=0" is included in
> vmlinux.

Apologies if I'm causing too much noise.

While thinking about this I recalled that I changed amdgpu from modular to
static when I had problems with netconsole.  I changed it back to
modular to see if that helps and I get the earlier mentioned hangs later
in the boot process when udevd starts and netconsole is up working.
This enables me to inspect boot messages and I tested with
amdgpu.discovery=0:

5,175,49060,-;Kernel command line: root=PARTLABEL=system1 amdgpu.discovery=0 loglevel=15 netconsole=...

I'm afraid I now get traces that commit b6df946ef4b5 (drm/amdgpu: fix
the nullptr issue as for PWR IP not existing in discovery table) is
fixing (output attached below) and I cannot decide how to continue with
bisecting...

Dirk

1,840,5418458,-;BUG: kernel NULL pointer dereference, address: 0000000000000008
1,841,5418472,-;#PF: supervisor read access in kernel mode
1,842,5418474,-;#PF: error_code(0x0000) - not-present page
6,843,5418476,-;PGD 0 P4D 0 
4,844,5418480,-;Oops: 0000 [#1] SMP NOPTI
4,845,5418483,-;CPU: 3 PID: 744 Comm: udevd Not tainted 5.7.0-rc2-x86_64-01641-gb770f04ba2ee #216
4,846,5418486,-;Hardware name: LENOVO 20U50008GE/20U50008GE, BIOS R19ET26W (1.10 ) 06/22/2020
4,847,5418559,-;RIP: 0010:nbio_v7_0_get_rev_id+0x9/0x1b [amdgpu]
4,848,5418562,-;Code: 5d 41 5d 41 5e e9 9a f0 f9 ff 48 8b 87 e8 5f 01 00 31 d2 8b 70 08 81 c6 c3 00 00 00 e9 9d ef f9 ff 48 8b 87 e8 5f 01 00 31 d2 <8b> 70 08 83 c6 0f e8 89 ef f9 ff c1 e8 18 83 e0 0f c3 49 89 f8 48
4,849,5418566,-;RSP: 0018:ffffc900011dba90 EFLAGS: 00010246
4,850,5418568,-;RAX: 0000000000000000 RBX: 0000000fffffffe0 RCX: 0000000000000018
4,851,5418571,-;RDX: 0000000000000000 RSI: ffffffffa0970e20 RDI: ffff8883f5540000
4,852,5418573,-;RBP: ffff8883f5540000 R08: 0000000000000001 R09: 0000000000000000
4,853,5418575,-;R10: 0000000000000000 R11: 0000000000000048 R12: 00000000ffffffea
4,854,5418577,-;R13: 7fffffffffffffff R14: ffff8883f9486800 R15: ffffc900011dbe98
4,855,5418580,-;FS:  00007f750db3dd80(0000) GS:ffff88840ecc0000(0000) knlGS:0000000000000000
4,856,5418583,-;CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
4,857,5418586,-;CR2: 0000000000000008 CR3: 00000003f9728000 CR4: 0000000000340ee0
4,858,5418588,-;Call Trace:
4,859,5418660,-; soc15_set_ip_blocks+0x105/0x4fd [amdgpu]
4,860,5418714,-; amdgpu_device_init+0xcab/0x1862 [amdgpu]
4,861,5418720,-; ? __kmalloc+0xb2/0xc4
4,862,5418766,-; amdgpu_driver_load_kms+0x41/0x178 [amdgpu]
4,863,5418813,-; amdgpu_pci_probe+0x147/0x1c7 [amdgpu]
4,864,5418818,-; pci_device_probe+0xc6/0x135
4,865,5418822,-; really_probe+0x157/0x2d1
4,866,5418825,-; driver_probe_device+0x97/0xcc
4,867,5418828,-; device_driver_attach+0x37/0x50
4,868,5418830,-; __driver_attach+0x92/0x9a
4,869,5418833,-; ? device_driver_attach+0x50/0x50
4,870,5418835,-; bus_for_each_dev+0x70/0xa6
4,871,5418838,-; bus_add_driver+0x103/0x1b4
4,872,5418840,-; driver_register+0x99/0xd2
4,873,5418842,-; ? 0xffffffffa09dc000
4,874,5418846,-; do_one_initcall+0x8a/0x195
4,875,5418849,-; ? kmem_cache_alloc_trace+0x84/0x93
4,876,5418852,-; do_init_module+0x56/0x1df
4,877,5418855,-; load_module+0x1bf2/0x2107
4,878,5418858,-; ? __do_sys_finit_module+0x8f/0xb6
4,879,5418860,-; __do_sys_finit_module+0x8f/0xb6
4,880,5418863,-; do_syscall_64+0x72/0x7f
4,881,5418867,-; entry_SYSCALL_64_after_hwframe+0x44/0xa9
4,882,5418870,-;RIP: 0033:0x7f750dc4d919
4,883,5418873,-;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 47 05 0c 00 f7 d8 64 89 01 48
4,884,5418878,-;RSP: 002b:00007fff47b3ce28 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
4,885,5418881,-;RAX: ffffffffffffffda RBX: 0000564d79f6cab0 RCX: 00007f750dc4d919
4,886,5418883,-;RDX: 0000000000000000 RSI: 0000564d79f4bf30 RDI: 000000000000000d
4,887,5418886,-;RBP: 0000000000020000 R08: 0000000000000000 R09: 00007fff47b3cf90
4,888,5418888,-;R10: 000000000000000d R11: 0000000000000246 R12: 0000564d79f4bf30
4,889,5418890,-;R13: 0000000000000000 R14: 0000564d79f4bc40 R15: 0000564d79f6cab0
4,890,5418893,-;Modules linked in: snd_hda_codec_realtek(+) wmi_bmof iwlwifi(+) snd_hda_codec_generic snd_hda_codec_hdmi amdgpu(+) snd_hda_intel cfg80211 snd_i
ntel_dspcfg snd_hda_codec gpu_sched aesni_intel(+) ttm ccp snd_hda_core sdhci_pci tpm_crb rng_core snd_pcm cqhci sdhci xhci_pci mmc_core drm_kms_helper sha1_ge
neric snd_timer xhci_hcd thinkpad_acpi(+) i2c_piix4 nvram snd soundcore battery ledtrig_audio rfkill ac video tpm_tis tpm_tis_core tpm wmi acpi_cpufreq pinctrl
_amd button efivarfs
4,891,5418914,-;CR2: 0000000000000008
4,892,5418917,-;---[ end trace 3112fb5c01e68aa6 ]---
4,893,5418967,-;RIP: 0010:nbio_v7_0_get_rev_id+0x9/0x1b [amdgpu]
4,894,5418970,-;Code: 5d 41 5d 41 5e e9 9a f0 f9 ff 48 8b 87 e8 5f 01 00 31 d2 8b 70 08 81 c6 c3 00 00 00 e9 9d ef f9 ff 48 8b 87 e8 5f 01 00 31 d2 <8b> 70 08 83 c6 0f e8 89 ef f9 ff c1 e8 18 83 e0 0f c3 49 89 f8 48
4,895,5418974,-;RSP: 0018:ffffc900011dba90 EFLAGS: 00010246
4,896,5418976,-;RAX: 0000000000000000 RBX: 0000000fffffffe0 RCX: 0000000000000018
4,897,5418979,-;RDX: 0000000000000000 RSI: ffffffffa0970e20 RDI: ffff8883f5540000
4,898,5418981,-;RBP: ffff8883f5540000 R08: 0000000000000001 R09: 0000000000000000
4,899,5418983,-;R10: 0000000000000000 R11: 0000000000000048 R12: 00000000ffffffea
4,900,5418985,-;R13: 7fffffffffffffff R14: ffff8883f9486800 R15: ffffc900011dbe98
4,901,5418988,-;FS:  00007f750db3dd80(0000) GS:ffff88840ecc0000(0000) knlGS:0000000000000000
4,902,5418990,-;CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
4,903,5418992,-;CR2: 0000000000000008 CR3: 00000003f9728000 CR4: 0000000000340ee0
28,904,5419847,-;udevd[689]: worker [744] terminated by signal 9 (Killed)
27,905,5419862,-;udevd[689]: worker [744] failed while handling '/devices/pci0000:00/0000:00:08.1/0000:06:00.0'


> Dirk
>
>>
>> Alex
>>
>>
>>>
>>> Dirk
>>>
>>> = bisect log ===========================================================
>>> git bisect start
>>> # bad: [9123e3a74ec7b934a4a099e98af6a61c2f80bbf5] Linux 5.9-rc1
>>> git bisect bad 9123e3a74ec7b934a4a099e98af6a61c2f80bbf5
>>> # good: [bcf876870b95592b52519ed4aafcf9d95999bc9c] Linux 5.8
>>> git bisect good bcf876870b95592b52519ed4aafcf9d95999bc9c
>>> # bad: [8186749621ed6b8fc42644c399e8c755a2b6f630] Merge tag
>>> 'drm-next-2020-08-06' of git://anongit.freedesktop.org/drm/drm
>>> git bisect bad 8186749621ed6b8fc42644c399e8c755a2b6f630
>>> # good: [2324d50d051ec0f14a548e78554fb02513d6dcef] Merge tag 'docs-5.9' of git://git.lwn.net/linux
>>> git bisect good 2324d50d051ec0f14a548e78554fb02513d6dcef
>>> # bad: [54d44bfc56308d105b0da37392d8398bdc9d4745] drm/nouveau/nvif:
>>> give every disp object a human-readable identifier
>>> git bisect bad 54d44bfc56308d105b0da37392d8398bdc9d4745
>>> # bad: [9555152beb1143c85c03f9b9de59863cbbe89f4b] Merge tag
>>> 'amd-drm-next-5.9-2020-07-01' of
>>> git://people.freedesktop.org/~agd5f/linux into drm-next
>>> git bisect bad 9555152beb1143c85c03f9b9de59863cbbe89f4b
>>> # bad: [dfd991794685b1228387214f28630b6e94e56944] drm/amd/display: Not doing bios data pack.
>>> git bisect bad dfd991794685b1228387214f28630b6e94e56944
>>> # good: [ba806f98f868ce107aa9c453fef751de9980e4af] drm/radeon: disable AGP by default
>>> git bisect good ba806f98f868ce107aa9c453fef751de9980e4af
>>> # good: [97d798b276e94a366dfb03d62bc90d4742ab3a31] drm/amdgpu: simplify ATIF backlight handling
>>> git bisect good 97d798b276e94a366dfb03d62bc90d4742ab3a31
>>> # good: [ac4e189a5623579c023c9cf8006422aef2a487b4] drm/amdgpu/gfx10: add navi12 to gfxoff case
>>> git bisect good ac4e189a5623579c023c9cf8006422aef2a487b4
>>> # good: [70534d1ee89ceadd03292d0c2da4dd4020189678] drm/amdgpu: simplify raven and renoir checks
>>> git bisect good 70534d1ee89ceadd03292d0c2da4dd4020189678
>>> # good: [4541ea81edde6ce9a1d9be082489aca7e8e7e1dc]
>>> drm/[radeon|amdgpu]: Replace one-element array and use struct_size()
>>> helper
>>> git bisect good 4541ea81edde6ce9a1d9be082489aca7e8e7e1dc
>>> # good: [84034ad4c0c0813c1350b43087eed036066edd5a] drm/amd/display: combine public interfaces into single header
>>> git bisect good 84034ad4c0c0813c1350b43087eed036066edd5a
>>> # good: [4f1fad0e9dbd762497df7c79309697ed8b2b6cfc] drm/amd/powerplay: stop thermal IRQs on suspend
>>> git bisect good 4f1fad0e9dbd762497df7c79309697ed8b2b6cfc
>>> # good: [4292b0b2026bc10bced32636ea02dd8eed00cea9] drm/amdgpu: clean up discovery testing
>>> git bisect good 4292b0b2026bc10bced32636ea02dd8eed00cea9
>>> # bad: [c0838cbee2d05c3eb8a2b5a3d1ce706a73008044] drm/amd/display: Revert "enable plane if plane_status changed"
>>> git bisect bad c0838cbee2d05c3eb8a2b5a3d1ce706a73008044
>>> # bad: [651a146526a04993c5bebf0e19cd9256f5e6511d] drm/amdgpu/jpeg: fix race condition issue for jpeg start
>>> git bisect bad 651a146526a04993c5bebf0e19cd9256f5e6511d
>>> # bad: [3bda8acd974e362069e291a78c59a10624debc6e] drm/amdgpu/sriov: Add clear vf fw support
>>> git bisect bad 3bda8acd974e362069e291a78c59a10624debc6e
>>> # bad: [b6df946ef4b5ae29183b2fdb2d12c381c757b3fb] drm/amdgpu: fix
>>> the nullptr issue as for PWR IP not existing in discovery table
>>> git bisect bad b6df946ef4b5ae29183b2fdb2d12c381c757b3fb
>>> ========================================================================
>>>
>>>
>>> > Please let me know if I can help with further information.
>>> >
>>> > Dirk
>>> >
>>> > = lspci -vk ============================================================
>>> >
>>> > 06:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Renoir (rev c3) (prog-if 00 [VGA controller])
>>> >         Subsystem: Lenovo Renoir
>>> >         Flags: bus master, fast devsel, latency 0, IRQ 64
>>> >         Memory at 460000000 (64-bit, prefetchable) [size=256M]
>>> >         Memory at 470000000 (64-bit, prefetchable) [size=2M]
>>> >         I/O ports at 1000 [size=256]
>>> >         Memory at fd300000 (32-bit, non-prefetchable) [size=512K]
>>> >         Capabilities: [48] Vendor Specific Information: Len=08 <?>
>>> >         Capabilities: [50] Power Management version 3
>>> >         Capabilities: [64] Express Legacy Endpoint, MSI 00
>>> >         Capabilities: [a0] MSI: Enable- Count=1/4 Maskable- 64bit+
>>> >         Capabilities: [c0] MSI-X: Enable+ Count=4 Masked-
>>> >         Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
>>> >         Capabilities: [270] Secondary PCI Express
>>> >         Capabilities: [2b0] Address Translation Service (ATS)
>>> >         Capabilities: [2c0] Page Request Interface (PRI)
>>> >         Capabilities: [2d0] Process Address Space ID (PASID)
>>> >         Capabilities: [400] Data Link Feature <?>
>>> >         Capabilities: [410] Physical Layer 16.0 GT/s <?>
>>> >         Capabilities: [440] Lane Margining at the Receiver <?>
>>> >         Kernel driver in use: amdgpu
>>> >         Kernel modules: amdgpu
>>> >
>>> > = call trace ===========================================================
>>> >
>>> > [    5.181468] amdgpu 0000:06:00.0: amdgpu: SMU is initialized successfully!
>>> > [    5.182857] [drm] kiq ring mec 2 pipe 1 q 0
>>> > [    5.183374] ------------[ cut here ]------------
>>> > [    5.183448] WARNING: CPU: 1 PID: 684 at drivers/gpu/drm/amd/amdgpu/../display/dc/clk_mgr/dcn21/rn_clk_mgr.c:716 rn_clk_mgr_construct+0x242/0x389 [amdgpu]
>>> > [    5.183449] Modules linked in: btusb btrtl btbcm btintel bluetooth ecdh_generic ecc iwlmvm mac80211 libarc4 wmi_bmof crct10dif_pclmul snd_hda_codec_realtek
>>> > crc32c_intel iwlwifi snd_hda_codec_generic amdgpu(+) tpm_crb snd_hda_codec_hdmi gpu_sched i2c_algo_bit ttm sdhci_pci aesni_intel drm_kms_helper cqhci sdhci ccp
>>> >  syscopyarea snd_hda_intel sysfillrect tpm_tis snd_intel_dspcfg sysimgblt xhci_pci tpm_tis_core fb_sys_fops r8169 snd_hda_codec mmc_core snd_hda_core xhci_hcd
>>> > thinkpad_acpi cfg80211 realtek drm snd_pcm rng_core mdio_devres sha1_generic snd_timer nvram libphy i2c_piix4 snd k10temp soundcore ledtrig_audio rfkill tpm hw
>>> > mon wmi battery ac video backlight pinctrl_amd acpi_cpufreq button efivarfs
>>> > [    5.183470] CPU: 1 PID: 684 Comm: udevd Not tainted 5.9.0-rc6-x86_64+ #170
>>> > [    5.183471] Hardware name: LENOVO 20U50008GE/20U50008GE, BIOS R19ET26W (1.10 ) 06/22/2020
>>> > [    5.183531] RIP: 0010:rn_clk_mgr_construct+0x242/0x389 [amdgpu]
>>> > [    5.183533] Code: 30 4d 85 c9 74 26 ba 03 00 00 00 83 bc d4 a8 00 00 00 00 89 d6 74 0a 83 bc d4 ac 00 00 00 00 75 40 48 ff ca 48 83 fa ff 75 e1 <0f> 0b 83 7
>>> > b 20 01 0f 84 13 01 00 00 81 bd e8 00 00 00 ff 14 37 00
>>> > [    5.183533] RSP: 0018:ffffc9000111f798 EFLAGS: 00010246
>>> > [    5.183534] RAX: ffff8883fc1d8e00 RBX: ffff8883f925c9c0 RCX: 0000000000000000
>>> > [    5.183535] RDX: ffffffffffffffff RSI: 0000000000000000 RDI: ffff8883f8da70c8
>>> > [    5.183535] RBP: ffff8883fe8da000 R08: 0000000000000000 R09: ffff8883f724fc00
>>> > [    5.183535] R10: 7fc9117fffffffff R11: ffff8883f925c9c0 R12: ffff8883f925c900
>>> > [    5.183536] R13: ffff8883f5980000 R14: 0000000000000000 R15: 0000000000000001
>>> > [    5.183537] FS:  00007f9e31a83d80(0000) GS:ffff88840ec40000(0000) knlGS:0000000000000000
>>> > [    5.183537] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>> > [    5.183538] CR2: 000055fdf9ec5568 CR3: 00000003fb2b6000 CR4: 0000000000350ee0
>>> > [    5.183538] Call Trace:
>>> > [    5.183595]  dc_clk_mgr_create+0x135/0x18b [amdgpu]
>>> > [    5.183651]  dc_create+0x238/0x5e3 [amdgpu]
>>> > [    5.183708]  amdgpu_dm_init+0x167/0x1101 [amdgpu]
>>> > [    5.183762]  dm_hw_init+0xa/0x17 [amdgpu]
>>> > [    5.183805]  amdgpu_device_init+0x1566/0x1853 [amdgpu]
>>> > [    5.183811]  ? __kmalloc+0xad/0xbf
>>> > [    5.183852]  ? amdgpu_driver_load_kms+0x1c/0x17f [amdgpu]
>>> > [    5.183892]  amdgpu_driver_load_kms+0x41/0x17f [amdgpu]
>>> > [    5.183959]  amdgpu_pci_probe+0x139/0x1c0 [amdgpu]
>>> > [    5.183967]  pci_device_probe+0xc6/0x135
>>> > [    5.183971]  really_probe+0x157/0x32a
>>> > [    5.183974]  driver_probe_device+0x63/0x97
>>> > [    5.183976]  device_driver_attach+0x37/0x50
>>> > [    5.183978]  __driver_attach+0x92/0x9a
>>> > [    5.183980]  ? device_driver_attach+0x50/0x50
>>> > [    5.183983]  bus_for_each_dev+0x70/0xa6
>>> > [    5.183986]  bus_add_driver+0x103/0x1b4
>>> > [    5.183988]  driver_register+0x99/0xd2
>>> > [    5.183990]  ? 0xffffffffa0b2f000
>>> > [    5.183993]  do_one_initcall+0x8a/0x195
>>> > [    5.183997]  ? kmem_cache_alloc_trace+0x80/0x8f
>>> > [    5.184002]  do_init_module+0x56/0x1e8
>>> > [    5.184005]  load_module+0x1c2c/0x2139
>>> > [    5.184010]  ? __do_sys_finit_module+0x8f/0xb6
>>> > [    5.184012]  __do_sys_finit_module+0x8f/0xb6
>>> > [    5.184017]  do_syscall_64+0x5d/0x6a
>>> > [    5.184021]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
>>> > [    5.184023] RIP: 0033:0x7f9e31b93919
>>> > [    5.184026] 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 47 05 0c 00 f7 d8 64 89 01 48
>>> > [    5.184028] RSP: 002b:00007fff315a0fa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
>>> > [    5.184030] RAX: ffffffffffffffda RBX: 000055fdf9eebde0 RCX: 00007f9e31b93919
>>> > [    5.184031] RDX: 0000000000000000 RSI: 00007f9e31c6a91d RDI: 0000000000000013
>>> > [    5.184032] RBP: 0000000000020000 R08: 0000000000000000 R09: 00007fff315a1110
>>> > [    5.184033] R10: 0000000000000013 R11: 0000000000000246 R12: 00007f9e31c6a91d
>>> > [    5.184034] R13: 0000000000000000 R14: 000055fdf9ed8060 R15: 000055fdf9eebde0
>>> > [    5.184037] ---[ end trace a782862b8da91b8d ]---
>>> _______________________________________________
>>> amd-gfx mailing list
>>> amd-gfx@...ts.freedesktop.org
>>> https://lists.freedesktop.org/mailman/listinfo/amd-gfx

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