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From: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
To: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: linux-rdma <linux-rdma@vger.kernel.org>,
	"Intel Graphics Development" <intel-gfx@lists.freedesktop.org>,
	LKML <linux-kernel@vger.kernel.org>,
	"amd-gfx list" <amd-gfx@lists.freedesktop.org>,
	"Chris Wilson" <chris@chris-wilson.co.uk>,
	"moderated list:DMA BUFFER SHARING FRAMEWORK"
	<linaro-mm-sig@lists.linaro.org>,
	"Thomas Hellstrom" <thomas.hellstrom@intel.com>,
	"DRI Development" <dri-devel@lists.freedesktop.org>,
	"Daniel Vetter" <daniel.vetter@intel.com>,
	"Mika Kuoppala" <mika.kuoppala@intel.com>,
	"Christian König" <christian.koenig@amd.com>,
	"open list:DMA BUFFER SHARING FRAMEWORK"
	<linux-media@vger.kernel.org>
Subject: Re: [Intel-gfx] [PATCH 03/18] dma-fence: basic lockdep annotations
Date: Thu, 11 Jun 2020 11:36:26 +0100
Message-ID: <19c6fe47-50ff-869e-d3f0-703b8165d577@linux.intel.com> (raw)
In-Reply-To: <CAKMK7uE4ak=gaKNJziaLg1qN1mE1FKLW1MGFkmUz2tR2y0ArAA@mail.gmail.com>


On 10/06/2020 16:17, Daniel Vetter wrote:
> On Wed, Jun 10, 2020 at 4:22 PM Tvrtko Ursulin
> <tvrtko.ursulin@linux.intel.com> wrote:
>>
>>
>> On 04/06/2020 09:12, Daniel Vetter wrote:
>>> Design is similar to the lockdep annotations for workers, but with
>>> some twists:
>>>
>>> - We use a read-lock for the execution/worker/completion side, so that
>>>     this explicit annotation can be more liberally sprinkled around.
>>>     With read locks lockdep isn't going to complain if the read-side
>>>     isn't nested the same way under all circumstances, so ABBA deadlocks
>>>     are ok. Which they are, since this is an annotation only.
>>>
>>> - We're using non-recursive lockdep read lock mode, since in recursive
>>>     read lock mode lockdep does not catch read side hazards. And we
>>>     _very_ much want read side hazards to be caught. For full details of
>>>     this limitation see
>>>
>>>     commit e91498589746065e3ae95d9a00b068e525eec34f
>>>     Author: Peter Zijlstra <peterz@infradead.org>
>>>     Date:   Wed Aug 23 13:13:11 2017 +0200
>>>
>>>         locking/lockdep/selftests: Add mixed read-write ABBA tests
>>>
>>> - To allow nesting of the read-side explicit annotations we explicitly
>>>     keep track of the nesting. lock_is_held() allows us to do that.
>>>
>>> - The wait-side annotation is a write lock, and entirely done within
>>>     dma_fence_wait() for everyone by default.
>>>
>>> - To be able to freely annotate helper functions I want to make it ok
>>>     to call dma_fence_begin/end_signalling from soft/hardirq context.
>>>     First attempt was using the hardirq locking context for the write
>>>     side in lockdep, but this forces all normal spinlocks nested within
>>>     dma_fence_begin/end_signalling to be spinlocks. That bollocks.
>>>
>>>     The approach now is to simple check in_atomic(), and for these cases
>>>     entirely rely on the might_sleep() check in dma_fence_wait(). That
>>>     will catch any wrong nesting against spinlocks from soft/hardirq
>>>     contexts.
>>>
>>> The idea here is that every code path that's critical for eventually
>>> signalling a dma_fence should be annotated with
>>> dma_fence_begin/end_signalling. The annotation ideally starts right
>>> after a dma_fence is published (added to a dma_resv, exposed as a
>>> sync_file fd, attached to a drm_syncobj fd, or anything else that
>>> makes the dma_fence visible to other kernel threads), up to and
>>> including the dma_fence_wait(). Examples are irq handlers, the
>>> scheduler rt threads, the tail of execbuf (after the corresponding
>>> fences are visible), any workers that end up signalling dma_fences and
>>> really anything else. Not annotated should be code paths that only
>>> complete fences opportunistically as the gpu progresses, like e.g.
>>> shrinker/eviction code.
>>>
>>> The main class of deadlocks this is supposed to catch are:
>>>
>>> Thread A:
>>>
>>>        mutex_lock(A);
>>>        mutex_unlock(A);
>>>
>>>        dma_fence_signal();
>>>
>>> Thread B:
>>>
>>>        mutex_lock(A);
>>>        dma_fence_wait();
>>>        mutex_unlock(A);
>>>
>>> Thread B is blocked on A signalling the fence, but A never gets around
>>> to that because it cannot acquire the lock A.
>>>
>>> Note that dma_fence_wait() is allowed to be nested within
>>> dma_fence_begin/end_signalling sections. To allow this to happen the
>>> read lock needs to be upgraded to a write lock, which means that any
>>> other lock is acquired between the dma_fence_begin_signalling() call and
>>> the call to dma_fence_wait(), and still held, this will result in an
>>> immediate lockdep complaint. The only other option would be to not
>>> annotate such calls, defeating the point. Therefore these annotations
>>> cannot be sprinkled over the code entirely mindless to avoid false
>>> positives.
>>>
>>> v2: handle soft/hardirq ctx better against write side and dont forget
>>> EXPORT_SYMBOL, drivers can't use this otherwise.
>>>
>>> v3: Kerneldoc.
>>>
>>> v4: Some spelling fixes from Mika
>>>
>>> Cc: Mika Kuoppala <mika.kuoppala@intel.com>
>>> Cc: Thomas Hellstrom <thomas.hellstrom@intel.com>
>>> Cc: linux-media@vger.kernel.org
>>> Cc: linaro-mm-sig@lists.linaro.org
>>> Cc: linux-rdma@vger.kernel.org
>>> Cc: amd-gfx@lists.freedesktop.org
>>> Cc: intel-gfx@lists.freedesktop.org
>>> Cc: Chris Wilson <chris@chris-wilson.co.uk>
>>> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
>>> Cc: Christian König <christian.koenig@amd.com>
>>> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
>>> ---
>>>    Documentation/driver-api/dma-buf.rst |  12 +-
>>>    drivers/dma-buf/dma-fence.c          | 161 +++++++++++++++++++++++++++
>>>    include/linux/dma-fence.h            |  12 ++
>>>    3 files changed, 182 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/Documentation/driver-api/dma-buf.rst b/Documentation/driver-api/dma-buf.rst
>>> index 63dec76d1d8d..05d856131140 100644
>>> --- a/Documentation/driver-api/dma-buf.rst
>>> +++ b/Documentation/driver-api/dma-buf.rst
>>> @@ -100,11 +100,11 @@ CPU Access to DMA Buffer Objects
>>>    .. kernel-doc:: drivers/dma-buf/dma-buf.c
>>>       :doc: cpu access
>>>
>>> -Fence Poll Support
>>> -~~~~~~~~~~~~~~~~~~
>>> +Implicit Fence Poll Support
>>> +~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>>
>>>    .. kernel-doc:: drivers/dma-buf/dma-buf.c
>>> -   :doc: fence polling
>>> +   :doc: implicit fence polling
>>>
>>>    Kernel Functions and Structures Reference
>>>    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>> @@ -133,6 +133,12 @@ DMA Fences
>>>    .. kernel-doc:: drivers/dma-buf/dma-fence.c
>>>       :doc: DMA fences overview
>>>
>>> +DMA Fence Signalling Annotations
>>> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>> +
>>> +.. kernel-doc:: drivers/dma-buf/dma-fence.c
>>> +   :doc: fence signalling annotation
>>> +
>>>    DMA Fences Functions Reference
>>>    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>>
>>> diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c
>>> index 656e9ac2d028..0005bc002529 100644
>>> --- a/drivers/dma-buf/dma-fence.c
>>> +++ b/drivers/dma-buf/dma-fence.c
>>> @@ -110,6 +110,160 @@ u64 dma_fence_context_alloc(unsigned num)
>>>    }
>>>    EXPORT_SYMBOL(dma_fence_context_alloc);
>>>
>>> +/**
>>> + * DOC: fence signalling annotation
>>> + *
>>> + * Proving correctness of all the kernel code around &dma_fence through code
>>> + * review and testing is tricky for a few reasons:
>>> + *
>>> + * * It is a cross-driver contract, and therefore all drivers must follow the
>>> + *   same rules for lock nesting order, calling contexts for various functions
>>> + *   and anything else significant for in-kernel interfaces. But it is also
>>> + *   impossible to test all drivers in a single machine, hence brute-force N vs.
>>> + *   N testing of all combinations is impossible. Even just limiting to the
>>> + *   possible combinations is infeasible.
>>> + *
>>> + * * There is an enormous amount of driver code involved. For render drivers
>>> + *   there's the tail of command submission, after fences are published,
>>> + *   scheduler code, interrupt and workers to process job completion,
>>> + *   and timeout, gpu reset and gpu hang recovery code. Plus for integration
>>> + *   with core mm with have &mmu_notifier, respectively &mmu_interval_notifier,
>>> + *   and &shrinker. For modesetting drivers there's the commit tail functions
>>> + *   between when fences for an atomic modeset are published, and when the
>>> + *   corresponding vblank completes, including any interrupt processing and
>>> + *   related workers. Auditing all that code, across all drivers, is not
>>> + *   feasible.
>>> + *
>>> + * * Due to how many other subsystems are involved and the locking hierarchies
>>> + *   this pulls in there is extremely thin wiggle-room for driver-specific
>>> + *   differences. &dma_fence interacts with almost all of the core memory
>>> + *   handling through page fault handlers via &dma_resv, dma_resv_lock() and
>>> + *   dma_resv_unlock(). On the other side it also interacts through all
>>> + *   allocation sites through &mmu_notifier and &shrinker.
>>> + *
>>> + * Furthermore lockdep does not handle cross-release dependencies, which means
>>> + * any deadlocks between dma_fence_wait() and dma_fence_signal() can't be caught
>>> + * at runtime with some quick testing. The simplest example is one thread
>>> + * waiting on a &dma_fence while holding a lock::
>>> + *
>>> + *     lock(A);
>>> + *     dma_fence_wait(B);
>>> + *     unlock(A);
>>> + *
>>> + * while the other thread is stuck trying to acquire the same lock, which
>>> + * prevents it from signalling the fence the previous thread is stuck waiting
>>> + * on::
>>> + *
>>> + *     lock(A);
>>> + *     unlock(A);
>>> + *     dma_fence_signal(B);
>>> + *
>>> + * By manually annotating all code relevant to signalling a &dma_fence we can
>>> + * teach lockdep about these dependencies, which also helps with the validation
>>> + * headache since now lockdep can check all the rules for us::
>>> + *
>>> + *    cookie = dma_fence_begin_signalling();
>>> + *    lock(A);
>>> + *    unlock(A);
>>> + *    dma_fence_signal(B);
>>> + *    dma_fence_end_signalling(cookie);
>>> + *
>>> + * For using dma_fence_begin_signalling() and dma_fence_end_signalling() to
>>> + * annotate critical sections the following rules need to be observed:
>>> + *
>>> + * * All code necessary to complete a &dma_fence must be annotated, from the
>>> + *   point where a fence is accessible to other threads, to the point where
>>> + *   dma_fence_signal() is called. Un-annotated code can contain deadlock issues,
>>> + *   and due to the very strict rules and many corner cases it is infeasible to
>>> + *   catch these just with review or normal stress testing.
>>> + *
>>> + * * &struct dma_resv deserves a special note, since the readers are only
>>> + *   protected by rcu. This means the signalling critical section starts as soon
>>> + *   as the new fences are installed, even before dma_resv_unlock() is called.
>>> + *
>>> + * * The only exception are fast paths and opportunistic signalling code, which
>>> + *   calls dma_fence_signal() purely as an optimization, but is not required to
>>> + *   guarantee completion of a &dma_fence. The usual example is a wait IOCTL
>>> + *   which calls dma_fence_signal(), while the mandatory completion path goes
>>> + *   through a hardware interrupt and possible job completion worker.
>>> + *
>>> + * * To aid composability of code, the annotations can be freely nested, as long
>>> + *   as the overall locking hierarchy is consistent. The annotations also work
>>> + *   both in interrupt and process context. Due to implementation details this
>>> + *   requires that callers pass an opaque cookie from
>>> + *   dma_fence_begin_signalling() to dma_fence_end_signalling().
>>> + *
>>> + * * Validation against the cross driver contract is implemented by priming
>>> + *   lockdep with the relevant hierarchy at boot-up. This means even just
>>> + *   testing with a single device is enough to validate a driver, at least as
>>> + *   far as deadlocks with dma_fence_wait() against dma_fence_signal() are
>>> + *   concerned.
>>> + */
>>> +#ifdef CONFIG_LOCKDEP
>>> +struct lockdep_map   dma_fence_lockdep_map = {
>>> +     .name = "dma_fence_map"
>>> +};
>>
>> Maybe a stupid question because this is definitely complicated, but.. If
>> you have a single/static/global lockdep map, doesn't this mean _all_
>> locks, from _all_ drivers happening to use dma-fences will get recorded
>> in it. Will this work and not cause false positives?
>>
>> Sounds like it could create a common link between two completely
>> unconnected usages. Because below you do add annotations to generic
>> dma_fence_signal and dma_fence_wait.
> 
> This is fully intentional. dma-fence is a cross-driver interface, if
> every driver invents its own rules about how this should work we have
> an unmaintainable and unreviewable mess.
> 
> I've typed up the full length rant already here:
> 
> https://lore.kernel.org/dri-devel/CAKMK7uGnFhbpuurRsnZ4dvRV9gQ_3-rmSJaoqSFY=+Kvepz_CA@mail.gmail.com/

But "perfect storm" of:

 + global fence lockmap
 + mmu notifiers
 + fs reclaim
 + default annotations in dma_fence_signal / dma_fence_wait

Equals to anything ever using dma_fence will be in impossible chains with random other drivers, even if neither driver has code to export/share that fence.

Example from the CI run:

 [25.918788] Chain exists of:
  fs_reclaim --> mmu_notifier_invalidate_range_start --> dma_fence_map
 [25.918794]  Possible unsafe locking scenario:
 [25.918797]        CPU0                    CPU1
 [25.918799]        ----                    ----
 [25.918801]   lock(dma_fence_map);
 [25.918803]                                lock(mmu_notifier_invalidate_range_start);
 [25.918807]                                lock(dma_fence_map);
 [25.918809]   lock(fs_reclaim);

What about a dma_fence_export helper which would "arm" the annotations? It would be called as soon as the fence is exported. Maybe when added to dma_resv, or exported via sync_file, etc. Before that point begin/end_signaling and so would be no-ops. 

>>> +
>>> +/**
>>> + * dma_fence_begin_signalling - begin a critical DMA fence signalling section
>>> + *
>>> + * Drivers should use this to annotate the beginning of any code section
>>> + * required to eventually complete &dma_fence by calling dma_fence_signal().
>>> + *
>>> + * The end of these critical sections are annotated with
>>> + * dma_fence_end_signalling().
>>> + *
>>> + * Returns:
>>> + *
>>> + * Opaque cookie needed by the implementation, which needs to be passed to
>>> + * dma_fence_end_signalling().
>>> + */
>>> +bool dma_fence_begin_signalling(void)
>>> +{
>>> +     /* explicitly nesting ... */
>>> +     if (lock_is_held_type(&dma_fence_lockdep_map, 1))
>>> +             return true;
>>> +
>>> +     /* rely on might_sleep check for soft/hardirq locks */
>>> +     if (in_atomic())
>>> +             return true;
>>> +
>>> +     /* ... and non-recursive readlock */
>>> +     lock_acquire(&dma_fence_lockdep_map, 0, 0, 1, 1, NULL, _RET_IP_);
>>
>> Would it work if signalling path would mark itself as a write lock? I am
>> thinking it would be nice to see in lockdep splats what are signals and
>> what are waits.
> 
> Yeah it'd be nice to have a read vs write name for the lock. But we
> already have this problem for e.g. flush_work(), from which I've
> stolen this idea. So it's not really new. Essentially look at the
> backtraces lockdep gives you, and reconstruct the deadlock. I'm hoping
> that people will notice the special functions on the backtrace, e.g.
> dma_fence_begin_signalling will be listed as offending function/lock
> holder, and then read the kerneldoc.
> 
>> The recursive usage wouldn't work then right? Would write annotation on
>> the wait path work?
> 
> Wait path is write annotations already, but yeah annotating the
> signalling side as write would cause endless amounts of alse
> positives. Also it makes composability of these e.g. what I've done in
> amdgpu with annotations in tdr work in drm/scheduler, annotations in
> the amdgpu gpu reset code and then also annotations in atomic code,
> which all nest within each other in some call chains, but not others.
> Dropping the recursion would break that and make it really awkward to
> annotate such cases correctly.
> 
> And the recursion only works if it's read locks, otherwise lockdep
> complains if you have inconsistent annotations on the signalling side
> (which again would make it more or less impossible to annotate the
> above case fully).

How do I see in lockdep splats if it was a read or write user? Your patch appears to have:

dma_fence_signal:
+	lock_acquire(&dma_fence_lockdep_map, 0, 0, 1, 1, NULL, _RET_IP_);

__dma_fence_might_wait:
+	lock_acquire(&dma_fence_lockdep_map, 0, 0, 1, 1, NULL, _THIS_IP_);

Which both seem like read lock. I don't fully understand the lockdep API so I might be wrong, not sure. But neither I see a difference in splats telling me which path is which.

Regards,

Tvrtko
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  reply index

Thread overview: 106+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-04  8:12 [PATCH 00/18] dma-fence lockdep annotations, round 2 Daniel Vetter
2020-06-04  8:12 ` [PATCH 01/18] mm: Track mmu notifiers in fs_reclaim_acquire/release Daniel Vetter
2020-06-10 12:01   ` Thomas Hellström (Intel)
2020-06-10 12:25     ` [Intel-gfx] " Daniel Vetter
2020-06-10 19:41   ` [PATCH] " Daniel Vetter
2020-06-11 14:29     ` Jason Gunthorpe
2020-06-21 17:42     ` Qian Cai
2020-06-21 18:07       ` Daniel Vetter
2020-06-21 20:01         ` Daniel Vetter
2020-06-21 22:09           ` Qian Cai
2020-06-23 16:17           ` Qian Cai
2020-06-23 22:13             ` Daniel Vetter
2020-06-23 22:29               ` Qian Cai
2020-06-23 22:31       ` Dave Chinner
2020-06-23 22:36         ` Daniel Vetter
2020-06-21 17:00   ` [PATCH 01/18] " Qian Cai
2020-06-21 17:28     ` Daniel Vetter
2020-06-21 17:46       ` Qian Cai
2020-06-04  8:12 ` [PATCH 02/18] dma-buf: minor doc touch-ups Daniel Vetter
2020-06-10 13:07   ` Thomas Hellström (Intel)
2020-06-04  8:12 ` [PATCH 03/18] dma-fence: basic lockdep annotations Daniel Vetter
2020-06-04  8:57   ` Thomas Hellström (Intel)
2020-06-04  9:21     ` Daniel Vetter
2020-06-04  9:26       ` Chris Wilson
2020-06-04  9:36         ` [Intel-gfx] " Daniel Vetter
2020-06-05 13:29   ` [PATCH] " Daniel Vetter
2020-06-05 14:30     ` Thomas Hellström (Intel)
2020-06-11  9:57     ` Maarten Lankhorst
2020-06-10 14:21   ` [Intel-gfx] [PATCH 03/18] " Tvrtko Ursulin
2020-06-10 15:17     ` Daniel Vetter
2020-06-11 10:36       ` Tvrtko Ursulin [this message]
2020-06-11 11:29         ` Daniel Vetter
2020-06-11 14:29           ` Tvrtko Ursulin
2020-06-11 15:03             ` Daniel Vetter
2020-06-11  8:00   ` Chris Wilson
2020-06-11  8:44     ` Dave Airlie
2020-06-11  9:01       ` [Intel-gfx] " Daniel Stone
2020-06-19  8:25         ` Chris Wilson
2020-06-19  8:51           ` Daniel Vetter
2020-06-19  9:13             ` Chris Wilson
2020-06-19  9:43               ` Daniel Vetter
2020-06-19 13:12                 ` Chris Wilson
2020-06-22  9:16                   ` Daniel Vetter
2020-07-09  7:29                 ` Daniel Stone
2020-07-09  8:01                   ` Daniel Vetter
2020-06-12  7:06   ` [PATCH] " Daniel Vetter
2020-06-04  8:12 ` [PATCH 04/18] dma-fence: prime " Daniel Vetter
2020-06-11  7:30   ` [Linaro-mm-sig] " Thomas Hellström (Intel)
2020-06-11  8:34     ` Daniel Vetter
2020-06-11 14:15       ` Jason Gunthorpe
2020-06-11 23:35         ` Felix Kuehling
2020-06-12  5:11           ` Daniel Vetter
2020-06-19 18:13           ` Jerome Glisse
2020-06-23  7:39           ` Daniel Vetter
2020-06-23 18:44             ` Felix Kuehling
2020-06-23 19:02               ` Daniel Vetter
2020-06-16 12:07         ` Daniel Vetter
2020-06-16 14:53           ` Jason Gunthorpe
2020-06-17  7:57             ` Daniel Vetter
2020-06-17 15:29               ` Jason Gunthorpe
2020-06-18 14:42                 ` Daniel Vetter
2020-06-17  6:48           ` Daniel Vetter
2020-06-17 15:28             ` Jason Gunthorpe
2020-06-18 15:00               ` Daniel Vetter
2020-06-18 17:23                 ` Jason Gunthorpe
2020-06-19  7:22                   ` Daniel Vetter
2020-06-19 11:39                     ` Jason Gunthorpe
2020-06-19 15:06                       ` Daniel Vetter
2020-06-19 15:15                         ` Jason Gunthorpe
2020-06-19 16:19                           ` Daniel Vetter
2020-06-19 17:23                             ` Jason Gunthorpe
2020-06-19 18:09                               ` Jerome Glisse
2020-06-19 18:18                                 ` Jason Gunthorpe
2020-06-19 19:48                                   ` Felix Kuehling
2020-06-19 19:55                                     ` Jason Gunthorpe
2020-06-19 20:03                                       ` Felix Kuehling
2020-06-19 20:31                                       ` Jerome Glisse
2020-06-22 11:46                                         ` Jason Gunthorpe
2020-06-22 20:15                                           ` Jerome Glisse
2020-06-23  0:02                                             ` Jason Gunthorpe
2020-06-19 20:10                                   ` Jerome Glisse
2020-06-19 20:43                                     ` Daniel Vetter
2020-06-19 20:59                                       ` Jerome Glisse
2020-06-23  0:05                                     ` Jason Gunthorpe
2020-06-19 19:11                                 ` Alex Deucher
2020-06-19 19:30                                   ` Felix Kuehling
2020-06-19 19:40                                     ` Jerome Glisse
2020-06-19 19:51                                     ` Jason Gunthorpe
2020-06-12  7:01   ` [PATCH] " Daniel Vetter
2020-06-04  8:12 ` [PATCH 05/18] drm/vkms: Annotate vblank timer Daniel Vetter
2020-06-04  8:12 ` [PATCH 06/18] drm/vblank: Annotate with dma-fence signalling section Daniel Vetter
2020-06-04  8:12 ` [PATCH 07/18] drm/atomic-helper: Add dma-fence annotations Daniel Vetter
2020-06-04  8:12 ` [PATCH 08/18] drm/amdgpu: add dma-fence annotations to atomic commit path Daniel Vetter
2020-06-23 10:51   ` Daniel Vetter
2020-06-04  8:12 ` [PATCH 09/18] drm/scheduler: use dma-fence annotations in main thread Daniel Vetter
2020-06-04  8:12 ` [PATCH 10/18] drm/amdgpu: use dma-fence annotations in cs_submit() Daniel Vetter
2020-06-04  8:12 ` [PATCH 11/18] drm/amdgpu: s/GFP_KERNEL/GFP_ATOMIC in scheduler code Daniel Vetter
2020-06-04  8:12 ` [PATCH 12/18] drm/amdgpu: DC also loves to allocate stuff where it shouldn't Daniel Vetter
2020-06-04  8:12 ` [PATCH 13/18] drm/amdgpu/dc: Stop dma_resv_lock inversion in commit_tail Daniel Vetter
2020-06-05  8:30   ` Pierre-Eric Pelloux-Prayer
2020-06-05 12:41     ` Daniel Vetter
2020-06-04  8:12 ` [PATCH 14/18] drm/scheduler: use dma-fence annotations in tdr work Daniel Vetter
2020-06-04  8:12 ` [PATCH 15/18] drm/amdgpu: use dma-fence annotations for gpu reset code Daniel Vetter
2020-06-04  8:12 ` [PATCH 16/18] Revert "drm/amdgpu: add fbdev suspend/resume on gpu reset" Daniel Vetter
2020-06-04  8:12 ` [PATCH 17/18] drm/amdgpu: gpu recovery does full modesets Daniel Vetter
2020-06-04  8:12 ` [PATCH 18/18] drm/i915: Annotate dma_fence_work Daniel Vetter

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AMD-GFX Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/amd-gfx/0 amd-gfx/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 amd-gfx amd-gfx/ https://lore.kernel.org/amd-gfx \
		amd-gfx@lists.freedesktop.org
	public-inbox-index amd-gfx

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.freedesktop.lists.amd-gfx


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git