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Message-ID: <CAKMK7uFvpFfJ6oG=MQ8Qb5Mq4kRtwvw5u2nD2ZLi8=qBD3OHaQ@mail.gmail.com>
Date: Wed, 3 Feb 2021 18:33:58 +0100
From: Daniel Vetter <daniel@...ll.ch>
To: Alex Deucher <alexdeucher@...il.com>,
Jason Ekstrand <jason@...kstrand.net>
Cc: "Bridgman, John" <John.Bridgman@....com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
dri-devel <dri-devel@...ts.freedesktop.org>,
amd-gfx list <amd-gfx@...ts.freedesktop.org>,
"Deucher, Alexander" <Alexander.Deucher@....com>,
Daniel Gomez <daniel@...c.com>,
"Koenig, Christian" <Christian.Koenig@....com>
Subject: Re: [amdgpu] deadlock
On Wed, Feb 3, 2021 at 6:14 PM Daniel Vetter <daniel@...ll.ch> wrote:
>
> On Wed, Feb 3, 2021 at 5:42 PM Alex Deucher <alexdeucher@...il.com> wrote:
> >
> > On Wed, Feb 3, 2021 at 9:42 AM Daniel Vetter <daniel@...ll.ch> wrote:
> > >
> > > On Wed, Feb 3, 2021 at 3:33 PM Bridgman, John <John.Bridgman@....com> wrote:
> > > >
> > > > >>Uh, that doesn't work. If you want infinite compute queues you need the
> > > > amdkfd model with preempt-ctx dma_fence. If you allow normal cs ioctl to
> > > > run forever, you just hang the kernel whenever userspace feels like. Not
> > > > just the gpu, the kernel (anything that allocates memory, irrespective of
> > > > process can hang). That's no good.
> > > >
> > > > We have moved from using gfx paths to using kfd paths as of the 20.45 release a couple of months ago. Not sure if that applies to APU's yet but if not I would expect it to just be a matter of time.
> > >
> > > Yeah but that still leaves a DOS attack open. I think we have to
> > > change the reset timeout for compute kernels to something reasonable
> > > to close that (and eat some of the angry bug reporters and politely
> > > tell them to pls upgrade). Hanging gpu's is kinda fine (but shouldn't
> > > affect other process really, if at all possible), hanging kernels at
> > > large not so much.
> >
> > This can also potentially affect long running Vulkan or OpenGL compute
> > kernels. Not sure we have a good solution for them. People are
> > starting to build ML stuff on vulkan.
>
> Yeah they need the compute mode with userspace fences and long running
> batches for that. It wont work on legacy implict synced cs, at least
> not with major surgery. That's why I asked whether the entirely
> separate amdkfd world for compute is really such a great idea, since I
> expect it'll come and bite us pretty bad.
>
> Fundamentally you can't have indefinite fences with implicit synced
> CS, and long running jobs is just one of these indefinite fences.
Adding Jason, he's been involved in a lot of the indefinite fence
discussion, especially around vk.
-Daniel
>
> >
> > Alex
> >
> >
> > > -Daniel
> > >
> > > > Thanks,
> > > > John
> > > > Original Message
> > > > From: Daniel Vetter
> > > > Sent: Wednesday, February 3, 2021 9:27 AM
> > > > To: Alex Deucher
> > > > Cc: Linux Kernel Mailing List; dri-devel; amd-gfx list; Deucher, Alexander; Daniel Gomez; Koenig, Christian
> > > > Subject: Re: [amdgpu] deadlock
> > > >
> > > >
> > > > On Wed, Feb 03, 2021 at 08:56:17AM -0500, Alex Deucher wrote:
> > > > > On Wed, Feb 3, 2021 at 7:30 AM Christian König <christian.koenig@....com> wrote:
> > > > > >
> > > > > > Am 03.02.21 um 13:24 schrieb Daniel Vetter:
> > > > > > > On Wed, Feb 03, 2021 at 01:21:20PM +0100, Christian König wrote:
> > > > > > >> Am 03.02.21 um 12:45 schrieb Daniel Gomez:
> > > > > > >>> On Wed, 3 Feb 2021 at 10:47, Daniel Gomez <daniel@...c.com> wrote:
> > > > > > >>>> On Wed, 3 Feb 2021 at 10:17, Daniel Vetter <daniel@...ll.ch> wrote:
> > > > > > >>>>> On Wed, Feb 3, 2021 at 9:51 AM Christian König <christian.koenig@....com> wrote:
> > > > > > >>>>>> Am 03.02.21 um 09:48 schrieb Daniel Vetter:
> > > > > > >>>>>>> On Wed, Feb 3, 2021 at 9:36 AM Christian König <christian.koenig@....com> wrote:
> > > > > > >>>>>>>> Hi Daniel,
> > > > > > >>>>>>>>
> > > > > > >>>>>>>> this is not a deadlock, but rather a hardware lockup.
> > > > > > >>>>>>> Are you sure? Ime getting stuck in dma_fence_wait has generally good
> > > > > > >>>>>>> chance of being a dma_fence deadlock. GPU hang should never result in
> > > > > > >>>>>>> a forever stuck dma_fence.
> > > > > > >>>>>> Yes, I'm pretty sure. Otherwise the hardware clocks wouldn't go up like
> > > > > > >>>>>> this.
> > > > > > >>>>> Maybe clarifying, could be both. TDR should notice and get us out of
> > > > > > >>>>> this, but if there's a dma_fence deadlock and we can't re-emit or
> > > > > > >>>>> force complete the pending things, then we're stuck for good.
> > > > > > >>>>> -Daniel
> > > > > > >>>>>
> > > > > > >>>>>> Question is rather why we end up in the userptr handling for GFX? Our
> > > > > > >>>>>> ROCm OpenCL stack shouldn't use this.
> > > > > > >>>>>>
> > > > > > >>>>>>> Daniel, can you pls re-hang your machine and then dump backtraces of
> > > > > > >>>>>>> all tasks into dmesg with sysrq-t, and then attach that? Without all
> > > > > > >>>>>>> the backtraces it's tricky to construct the full dependency chain of
> > > > > > >>>>>>> what's going on. Also is this plain -rc6, not some more patches on
> > > > > > >>>>>>> top?
> > > > > > >>>>>> Yeah, that's still a good idea to have.
> > > > > > >>>> Here the full backtrace dmesg logs after the hang:
> > > > > > >>>> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpastebin.com%2Fraw%2Fkzivm2L3&data=04%7C01%7Cjohn.bridgman%40amd.com%7Cbe4d5642b52242dd9fdb08d8c84fca13%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637479592320075525%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=z5%2FBK1akJi7%2BGrUZOA8cmyN7uOAn02ckU4tv1EprVQk%3D&reserved=0
> > > > > > >>>>
> > > > > > >>>> This is another dmesg log with the backtraces after SIGKILL the matrix process:
> > > > > > >>>> (I didn't have the sysrq enable at the time):
> > > > > > >>>> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpastebin.com%2Fraw%2FpRBwGcj1&data=04%7C01%7Cjohn.bridgman%40amd.com%7Cbe4d5642b52242dd9fdb08d8c84fca13%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637479592320075525%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=TPt%2BS8l6%2Boza78KQwGplTf%2FHj5guCctbJGq3WiioIGg%3D&reserved=0
> > > > > > >>> I've now removed all our v4l2 patches and did the same test with the 'plain'
> > > > > > >>> mainline version (-rc6).
> > > > > > >>>
> > > > > > >>> Reference: 3aaf0a27ffc29b19a62314edd684b9bc6346f9a8
> > > > > > >>>
> > > > > > >>> Same error, same behaviour. Full dmesg log attached:
> > > > > > >>> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpastebin.com%2Fraw%2FKgaEf7Y1&data=04%7C01%7Cjohn.bridgman%40amd.com%7Cbe4d5642b52242dd9fdb08d8c84fca13%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637479592320075525%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=wG%2Bex7ZOJWd%2B4ZQyhJA%2BHTVbzZXC2lRPSvzYfZlzwIY%3D&reserved=0
> > > > > > >>> Note:
> > > > > > >>> dmesg with sysrq-t before running the test starts in [ 122.016502]
> > > > > > >>> sysrq: Show State
> > > > > > >>> dmesg with sysrq-t after the test starts in: [ 495.587671] sysrq: Show State
> > > > > > >> There is nothing amdgpu related in there except for waiting for the
> > > > > > >> hardware.
> > > > > > > Yeah, but there's also no other driver that could cause a stuck dma_fence,
> > > > > > > so why is reset not cleaning up the mess here? Irrespective of why the gpu
> > > > > > > is stuck, the kernel should at least complete all the dma_fences even if
> > > > > > > the gpu for some reason is terminally ill ...
> > > > > >
> > > > > > That's a good question as well. I'm digging into this.
> > > > > >
> > > > > > My best theory is that the amdgpu packages disabled GPU reset for some
> > > > > > reason.
> > > > >
> > > > > The timeout for compute queues is infinite because of long running
> > > > > compute kernels. You can override with the amdgpu.lockup_timeout
> > > > > parameter.
> > > >
> > > > Uh, that doesn't work. If you want infinite compute queues you need the
> > > > amdkfd model with preempt-ctx dma_fence. If you allow normal cs ioctl to
> > > > run forever, you just hang the kernel whenever userspace feels like. Not
> > > > just the gpu, the kernel (anything that allocates memory, irrespective of
> > > > process can hang). That's no good.
> > > > -Daniel
> > > >
> > > > >
> > > > > Alex
> > > > >
> > > > > >
> > > > > > But the much more interesting question is why we end up in this call
> > > > > > path. I've pinged internally, but east coast is not awake yet :)
> > > > > >
> > > > > > Christian.
> > > > > >
> > > > > > > -Daniel
> > > > > > >
> > > > > > >> This is a pretty standard hardware lockup, but I'm still waiting for an
> > > > > > >> explanation why we end up in this call path in the first place.
> > > > > > >>
> > > > > > >> Christian.
> > > > > > >>
> > > > > > >>>
> > > > > > >>>>>> Christian.
> > > > > > >>>>>>
> > > > > > >>>>>>> -Daniel
> > > > > > >>>>>>>
> > > > > > >>>>>>>> Which OpenCl stack are you using?
> > > > > > >>>>>>>>
> > > > > > >>>>>>>> Regards,
> > > > > > >>>>>>>> Christian.
> > > > > > >>>>>>>>
> > > > > > >>>>>>>> Am 03.02.21 um 09:33 schrieb Daniel Gomez:
> > > > > > >>>>>>>>> Hi all,
> > > > > > >>>>>>>>>
> > > > > > >>>>>>>>> I have a deadlock with the amdgpu mainline driver when running in parallel two
> > > > > > >>>>>>>>> OpenCL applications. So far, we've been able to replicate it easily by executing
> > > > > > >>>>>>>>> clinfo and MatrixMultiplication (from AMD opencl-samples). It's quite old the
> > > > > > >>>>>>>>> opencl-samples so, if you have any other suggestion for testing I'd be very
> > > > > > >>>>>>>>> happy to test it as well.
> > > > > > >>>>>>>>>
> > > > > > >>>>>>>>> How to replicate the issue:
> > > > > > >>>>>>>>>
> > > > > > >>>>>>>>> # while true; do /usr/bin/MatrixMultiplication --device gpu \
> > > > > > >>>>>>>>> --deviceId 0 -x 1000 -y 1000 -z 1000 -q -t -i 50; done
> > > > > > >>>>>>>>> # while true; do clinfo; done
> > > > > > >>>>>>>>>
> > > > > > >>>>>>>>> Output:
> > > > > > >>>>>>>>>
> > > > > > >>>>>>>>> After a minute or less (sometimes could be more) I can see that
> > > > > > >>>>>>>>> MatrixMultiplication and clinfo hang. In addition, with radeontop you can see
> > > > > > >>>>>>>>> how the Graphics pipe goes from ~50% to 100%. Also the shader clocks
> > > > > > >>>>>>>>> goes up from ~35% to ~96%.
> > > > > > >>>>>>>>>
> > > > > > >>>>>>>>> clinfo keeps printing:
> > > > > > >>>>>>>>> ioctl(7, DRM_IOCTL_SYNCOBJ_WAIT, 0x7ffe46e5f950) = -1 ETIME (Timer expired)
> > > > > > >>>>>>>>>
> > > > > > >>>>>>>>> And MatrixMultiplication prints the following (strace) if you try to
> > > > > > >>>>>>>>> kill the process:
> > > > > > >>>>>>>>>
> > > > > > >>>>>>>>> sched_yield() = 0
> > > > > > >>>>>>>>> futex(0x557e945343b8, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0,
> > > > > > >>>>>>>>> NULL, FUTEX_BITSET_MATCH_ANYstrace: Process 651 detached
> > > > > > >>>>>>>>> <detached ...>
> > > > > > >>>>>>>>>
> > > > > > >>>>>>>>> After this, the gpu is not functional at all and you'd need a power cycle reset
> > > > > > >>>>>>>>> to restore the system.
> > > > > > >>>>>>>>>
> > > > > > >>>>>>>>> Hardware info:
> > > > > > >>>>>>>>> CPU: AMD Ryzen Embedded V1605B with Radeon Vega Gfx (8) @ 2.000GHz
> > > > > > >>>>>>>>> GPU: AMD ATI Radeon Vega Series / Radeon Vega Mobile Series
> > > > > > >>>>>>>>>
> > > > > > >>>>>>>>> 03:00.0 VGA compatible controller: Advanced Micro Devices, Inc.
> > > > > > >>>>>>>>> [AMD/ATI] Raven Ridge [Radeon Vega Series / Radeon Vega Mobile Series]
> > > > > > >>>>>>>>> (rev 83)
> > > > > > >>>>>>>>> DeviceName: Broadcom 5762
> > > > > > >>>>>>>>> Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Raven Ridge
> > > > > > >>>>>>>>> [Radeon Vega Series / Radeon Vega Mobile Series]
> > > > > > >>>>>>>>> Kernel driver in use: amdgpu
> > > > > > >>>>>>>>> Kernel modules: amdgpu
> > > > > > >>>>>>>>>
> > > > > > >>>>>>>>> Linux kernel info:
> > > > > > >>>>>>>>>
> > > > > > >>>>>>>>> root@...222:~# uname -a
> > > > > > >>>>>>>>> Linux qt5222 5.11.0-rc6-qtec-standard #2 SMP Tue Feb 2 09:41:46 UTC
> > > > > > >>>>>>>>> 2021 x86_64 x86_64 x86_64 GNU/Linux
> > > > > > >>>>>>>>>
> > > > > > >>>>>>>>> By enabling the kernel locks stats I could see the MatrixMultiplication is
> > > > > > >>>>>>>>> hanged in the amdgpu_mn_invalidate_gfx function:
> > > > > > >>>>>>>>>
> > > > > > >>>>>>>>> [ 738.359202] 1 lock held by MatrixMultiplic/653:
> > > > > > >>>>>>>>> [ 738.359206] #0: ffff88810e364fe0
> > > > > > >>>>>>>>> (&adev->notifier_lock){+.+.}-{3:3}, at:
> > > > > > >>>>>>>>> amdgpu_mn_invalidate_gfx+0x34/0xa0 [amdgpu]
> > > > > > >>>>>>>>>
> > > > > > >>>>>>>>> I can see in the the amdgpu_mn_invalidate_gfx function: the
> > > > > > >>>>>>>>> dma_resv_wait_timeout_rcu uses wait_all (fences) and MAX_SCHEDULE_TIMEOUT so, I
> > > > > > >>>>>>>>> guess the code gets stuck there waiting forever. According to the
> > > > > > >>>>>>>>> documentation: "When somebody tries to invalidate the page tables we block the
> > > > > > >>>>>>>>> update until all operations on the pages in question are completed, then those
> > > > > > >>>>>>>>> pages are marked as accessed and also dirty if it wasn’t a read only access."
> > > > > > >>>>>>>>> Looks like the fences are deadlocked and therefore, it never returns. Could it
> > > > > > >>>>>>>>> be possible? any hint to where can I look to fix this?
> > > > > > >>>>>>>>>
> > > > > > >>>>>>>>> Thank you in advance.
> > > > > > >>>>>>>>>
> > > > > > >>>>>>>>> Here the full dmesg output:
> > > > > > >>>>>>>>>
> > > > > > >>>>>>>>> [ 738.337726] INFO: task MatrixMultiplic:653 blocked for more than 122 seconds.
> > > > > > >>>>>>>>> [ 738.344937] Not tainted 5.11.0-rc6-qtec-standard #2
> > > > > > >>>>>>>>> [ 738.350384] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
> > > > > > >>>>>>>>> disables this message.
> > > > > > >>>>>>>>> [ 738.358240] task:MatrixMultiplic state:D stack: 0 pid: 653
> > > > > > >>>>>>>>> ppid: 1 flags:0x00004000
> > > > > > >>>>>>>>> [ 738.358254] Call Trace:
> > > > > > >>>>>>>>> [ 738.358261] ? dma_fence_default_wait+0x1eb/0x230
> > > > > > >>>>>>>>> [ 738.358276] __schedule+0x370/0x960
> > > > > > >>>>>>>>> [ 738.358291] ? dma_fence_default_wait+0x117/0x230
> > > > > > >>>>>>>>> [ 738.358297] ? dma_fence_default_wait+0x1eb/0x230
> > > > > > >>>>>>>>> [ 738.358305] schedule+0x51/0xc0
> > > > > > >>>>>>>>> [ 738.358312] schedule_timeout+0x275/0x380
> > > > > > >>>>>>>>> [ 738.358324] ? dma_fence_default_wait+0x1eb/0x230
> > > > > > >>>>>>>>> [ 738.358332] ? mark_held_locks+0x4f/0x70
> > > > > > >>>>>>>>> [ 738.358341] ? dma_fence_default_wait+0x117/0x230
> > > > > > >>>>>>>>> [ 738.358347] ? lockdep_hardirqs_on_prepare+0xd4/0x180
> > > > > > >>>>>>>>> [ 738.358353] ? _raw_spin_unlock_irqrestore+0x39/0x40
> > > > > > >>>>>>>>> [ 738.358362] ? dma_fence_default_wait+0x117/0x230
> > > > > > >>>>>>>>> [ 738.358370] ? dma_fence_default_wait+0x1eb/0x230
> > > > > > >>>>>>>>> [ 738.358375] dma_fence_default_wait+0x214/0x230
> > > > > > >>>>>>>>> [ 738.358384] ? dma_fence_release+0x1a0/0x1a0
> > > > > > >>>>>>>>> [ 738.358396] dma_fence_wait_timeout+0x105/0x200
> > > > > > >>>>>>>>> [ 738.358405] dma_resv_wait_timeout_rcu+0x1aa/0x5e0
> > > > > > >>>>>>>>> [ 738.358421] amdgpu_mn_invalidate_gfx+0x55/0xa0 [amdgpu]
> > > > > > >>>>>>>>> [ 738.358688] __mmu_notifier_release+0x1bb/0x210
> > > > > > >>>>>>>>> [ 738.358710] exit_mmap+0x2f/0x1e0
> > > > > > >>>>>>>>> [ 738.358723] ? find_held_lock+0x34/0xa0
> > > > > > >>>>>>>>> [ 738.358746] mmput+0x39/0xe0
> > > > > > >>>>>>>>> [ 738.358756] do_exit+0x5c3/0xc00
> > > > > > >>>>>>>>> [ 738.358763] ? find_held_lock+0x34/0xa0
> > > > > > >>>>>>>>> [ 738.358780] do_group_exit+0x47/0xb0
> > > > > > >>>>>>>>> [ 738.358791] get_signal+0x15b/0xc50
> > > > > > >>>>>>>>> [ 738.358807] arch_do_signal_or_restart+0xaf/0x710
> > > > > > >>>>>>>>> [ 738.358816] ? lockdep_hardirqs_on_prepare+0xd4/0x180
> > > > > > >>>>>>>>> [ 738.358822] ? _raw_spin_unlock_irqrestore+0x39/0x40
> > > > > > >>>>>>>>> [ 738.358831] ? ktime_get_mono_fast_ns+0x50/0xa0
> > > > > > >>>>>>>>> [ 738.358844] ? amdgpu_drm_ioctl+0x6b/0x80 [amdgpu]
> > > > > > >>>>>>>>> [ 738.359044] exit_to_user_mode_prepare+0xf2/0x1b0
> > > > > > >>>>>>>>> [ 738.359054] syscall_exit_to_user_mode+0x19/0x60
> > > > > > >>>>>>>>> [ 738.359062] entry_SYSCALL_64_after_hwframe+0x44/0xa9
> > > > > > >>>>>>>>> [ 738.359069] RIP: 0033:0x7f6b89a51887
> > > > > > >>>>>>>>> [ 738.359076] RSP: 002b:00007f6b82b54b18 EFLAGS: 00000246 ORIG_RAX:
> > > > > > >>>>>>>>> 0000000000000010
> > > > > > >>>>>>>>> [ 738.359086] RAX: fffffffffffffe00 RBX: 00007f6b82b54b50 RCX: 00007f6b89a51887
> > > > > > >>>>>>>>> [ 738.359091] RDX: 00007f6b82b54b50 RSI: 00000000c02064c3 RDI: 0000000000000007
> > > > > > >>>>>>>>> [ 738.359096] RBP: 00000000c02064c3 R08: 0000000000000003 R09: 00007f6b82b54bbc
> > > > > > >>>>>>>>> [ 738.359101] R10: 0000000000000001 R11: 0000000000000246 R12: 0000000165a0bc00
> > > > > > >>>>>>>>> [ 738.359106] R13: 0000000000000007 R14: 0000000000000001 R15: 0000000000000000
> > > > > > >>>>>>>>> [ 738.359129]
> > > > > > >>>>>>>>> Showing all locks held in the system:
> > > > > > >>>>>>>>> [ 738.359141] 1 lock held by khungtaskd/54:
> > > > > > >>>>>>>>> [ 738.359148] #0: ffffffff829f6840 (rcu_read_lock){....}-{1:2}, at:
> > > > > > >>>>>>>>> debug_show_all_locks+0x15/0x183
> > > > > > >>>>>>>>> [ 738.359187] 1 lock held by systemd-journal/174:
> > > > > > >>>>>>>>> [ 738.359202] 1 lock held by MatrixMultiplic/653:
> > > > > > >>>>>>>>> [ 738.359206] #0: ffff88810e364fe0
> > > > > > >>>>>>>>> (&adev->notifier_lock){+.+.}-{3:3}, at:
> > > > > > >>>>>>>>> amdgpu_mn_invalidate_gfx+0x34/0xa0 [amdgpu]
> > > > > > >>>>>>>>>
> > > > > > >>>>>>>>> Daniel
> > > > > > >>>>>>>> _______________________________________________
> > > > > > >>>>>>>> dri-devel mailing list
> > > > > > >>>>>>>> dri-devel@...ts.freedesktop.org
> > > > > > >>>>>>>> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.freedesktop.org%2Fmailman%2Flistinfo%2Fdri-devel&data=04%7C01%7Cjohn.bridgman%40amd.com%7Cbe4d5642b52242dd9fdb08d8c84fca13%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637479592320075525%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=5lN%2Fc2Kncy31PnJEJIUC%2BFAItXAmXAtKAHp%2F6d%2Burgo%3D&reserved=0
> > > > > > >>>>> --
> > > > > > >>>>> Daniel Vetter
> > > > > > >>>>> Software Engineer, Intel Corporation
> > > > > > >>>>> https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fblog.ffwll.ch%2F&data=04%7C01%7Cjohn.bridgman%40amd.com%7Cbe4d5642b52242dd9fdb08d8c84fca13%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637479592320085517%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=E6uF1FUrp9RSryVDLD1zIPaMFJU5aP5xvx7F9Mgf53s%3D&reserved=0
> > > > > > >>> _______________________________________________
> > > > > > >>> amd-gfx mailing list
> > > > > > >>> amd-gfx@...ts.freedesktop.org
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> > > >
> > > > --
> > > > Daniel Vetter
> > > > Software Engineer, Intel Corporation
> > > > https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fblog.ffwll.ch%2F&data=04%7C01%7Cjohn.bridgman%40amd.com%7Cbe4d5642b52242dd9fdb08d8c84fca13%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637479592320085517%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=E6uF1FUrp9RSryVDLD1zIPaMFJU5aP5xvx7F9Mgf53s%3D&reserved=0
> > > > _______________________________________________
> > > > amd-gfx mailing list
> > > > amd-gfx@...ts.freedesktop.org
> > > > https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.freedesktop.org%2Fmailman%2Flistinfo%2Famd-gfx&data=04%7C01%7Cjohn.bridgman%40amd.com%7Cbe4d5642b52242dd9fdb08d8c84fca13%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637479592320085517%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=sXukJnECw3PKXuY9V4JeUQtn86qH7EHHjHZ9brfILK0%3D&reserved=0
> > >
> > >
> > >
> > > --
> > > Daniel Vetter
> > > Software Engineer, Intel Corporation
> > > http://blog.ffwll.ch
>
>
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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