From: "Christian König" <christian.koenig@amd.com>
To: Maarten Lankhorst <maarten.lankhorst@canonical.com>,
Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: "Christian König" <deathsimple@vodafone.de>,
"Thomas Hellstrom" <thellstrom@vmware.com>,
nouveau <nouveau@lists.freedesktop.org>,
LKML <linux-kernel@vger.kernel.org>,
dri-devel <dri-devel@lists.freedesktop.org>,
"Ben Skeggs" <bskeggs@redhat.com>,
"Deucher, Alexander" <alexander.deucher@amd.com>
Subject: Re: [Nouveau] [PATCH 09/17] drm/radeon: use common fence implementation for fences
Date: Thu, 24 Jul 2014 15:47:42 +0200 [thread overview]
Message-ID: <53D10E7E.20501@amd.com> (raw)
In-Reply-To: <53CFC121.6040109@canonical.com>
Hi Maarten,
try to implement this as a replacement for specifying the
RADEON_FENCE_JIFFIES_TIMEOUT on wait_event_*. And reset the timeout
every time radeon_fence_process is called and not only when any of the
sequences increment.
I don't have the time right now to look deeper into it or help with the
patch, but the general approach sounds valid to me.
Regards,
Christian.
Am 23.07.2014 16:05, schrieb Maarten Lankhorst:
> op 23-07-14 15:16, Maarten Lankhorst schreef:
>> op 23-07-14 14:36, Christian König schreef:
>>> Am 23.07.2014 12:52, schrieb Daniel Vetter:
>>>> On Wed, Jul 23, 2014 at 12:13 PM, Christian König
>>>> <christian.koenig@amd.com> wrote:
>>>>>> And the dma-buf would still have fences belonging to both drivers, and it
>>>>>> would still call from outside the driver.
>>>>> Calling from outside the driver is fine as long as the driver can do
>>>>> everything necessary to complete it's work and isn't forced into any ugly
>>>>> hacks and things that are not 100% reliable.
>>>>>
>>>>> So I don't see much other approach as integrating recovery code for not
>>>>> firing interrupts and some kind of lockup handling into the fence code as
>>>>> well.
>>>> That approach doesn't really work at that well since every driver has
>>>> it's own reset semantics. And we're trying to move away from global
>>>> reset to fine-grained reset. So stop-the-world reset is out of
>>>> fashion, at least for i915. As you said, reset is normal in gpus and
>>>> we're trying to make reset less invasive. I really don't see a point
>>>> in imposing a reset scheme upon all drivers and I think you have about
>>>> as much motivation to convert radeon to the scheme used by i915 as
>>>> I'll have for converting to the one used by radeon. If it would fit at
>>>> all.
>>> Oh my! No, I didn't wanted to suggest any global reset infrastructure.
>>>
>>> My idea was more that the fence framework provides a fence->process_signaling callback that is periodically called after enable_signaling is called to trigger manual signal processing in the driver.
>>>
>>> This would both be suitable as a fallback in case of not working interrupts as well as a chance for any driver to do necessary lockup handling.
>> I managed to do it without needing it to be part of the interface? I'm not sure whether radeon_fence_driver_recheck needs exclusive_lock, but if so it's a small change..
>>
>> diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
>> index 7fbfd41479f1..51b646b9c8bb 100644
>> --- a/drivers/gpu/drm/radeon/radeon.h
>> +++ b/drivers/gpu/drm/radeon/radeon.h
>> @@ -345,6 +345,9 @@ struct radeon_fence_driver {
>> uint64_t sync_seq[RADEON_NUM_RINGS];
>> atomic64_t last_seq;
>> bool initialized;
>> + struct delayed_work work;
>> + struct radeon_device *rdev;
>> + unsigned ring;
>> };
>>
>> struct radeon_fence_cb {
>> diff --git a/drivers/gpu/drm/radeon/radeon_fence.c b/drivers/gpu/drm/radeon/radeon_fence.c
>> index da83f36dd708..955c825946ad 100644
>> --- a/drivers/gpu/drm/radeon/radeon_fence.c
>> +++ b/drivers/gpu/drm/radeon/radeon_fence.c
>> @@ -231,6 +231,9 @@ static bool __radeon_fence_process(struct radeon_device *rdev, int ring)
>> }
>> } while (atomic64_xchg(&rdev->fence_drv[ring].last_seq, seq) > seq);
>>
>> + if (!wake && last_seq < last_emitted)
>> + schedule_delayed_work(&rdev->fence_drv[ring].work, jiffies_to_msecs(10));
>> +
>>
> When trying this: if (seq < last_emitted) is probably a better check.
>
> ~Maarten
>
next prev parent reply other threads:[~2014-07-24 13:47 UTC|newest]
Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-09 12:29 [PATCH 00/17] Convert TTM to the new fence interface Maarten Lankhorst
2014-07-09 12:29 ` [PATCH 01/17] drm/ttm: add interruptible parameter to ttm_eu_reserve_buffers Maarten Lankhorst
2014-07-09 12:29 ` [PATCH 02/17] drm/ttm: kill off some members to ttm_validate_buffer Maarten Lankhorst
2014-07-09 12:29 ` [PATCH 03/17] drm/nouveau: add reservation to nouveau_gem_ioctl_cpu_prep Maarten Lankhorst
2014-07-09 12:29 ` [PATCH 04/17] drm/nouveau: require reservations for nouveau_fence_sync and nouveau_bo_fence Maarten Lankhorst
2014-07-09 12:29 ` [PATCH 05/17] drm/ttm: call ttm_bo_wait while inside a reservation Maarten Lankhorst
2014-07-09 12:29 ` [PATCH 06/17] drm/ttm: kill fence_lock Maarten Lankhorst
2014-07-09 12:29 ` [PATCH 07/17] drm/nouveau: rework to new fence interface Maarten Lankhorst
2014-07-09 12:29 ` [PATCH 08/17] drm/radeon: add timeout argument to radeon_fence_wait_seq Maarten Lankhorst
2014-07-09 12:29 ` [PATCH 09/17] drm/radeon: use common fence implementation for fences Maarten Lankhorst
2014-07-09 12:57 ` Deucher, Alexander
2014-07-09 13:23 ` [PATCH v2 " Maarten Lankhorst
2014-07-10 17:27 ` Alex Deucher
2014-07-22 4:05 ` [PATCH " Dave Airlie
2014-07-22 8:43 ` Christian König
2014-07-22 11:46 ` Daniel Vetter
2014-07-22 11:52 ` Daniel Vetter
2014-07-22 11:57 ` Daniel Vetter
2014-07-22 12:19 ` Christian König
2014-07-22 13:26 ` [Nouveau] " Daniel Vetter
2014-07-22 13:45 ` Christian König
2014-07-22 14:44 ` Maarten Lankhorst
2014-07-22 15:02 ` Christian König
2014-07-22 15:18 ` Maarten Lankhorst
2014-07-22 15:17 ` Daniel Vetter
2014-07-22 15:35 ` Christian König
2014-07-22 15:42 ` Daniel Vetter
2014-07-22 15:59 ` Christian König
2014-07-22 16:21 ` Daniel Vetter
2014-07-22 16:39 ` Christian König
2014-07-22 16:52 ` Daniel Vetter
2014-07-22 16:43 ` Daniel Vetter
2014-07-23 6:40 ` Maarten Lankhorst
2014-07-23 6:52 ` Christian König
2014-07-23 7:02 ` Daniel Vetter
2014-07-23 7:06 ` Maarten Lankhorst
2014-07-23 7:09 ` Daniel Vetter
2014-07-23 7:15 ` Christian König
2014-07-23 7:32 ` Maarten Lankhorst
2014-07-23 7:41 ` Christian König
2014-07-23 7:26 ` Christian König
2014-07-23 7:31 ` Daniel Vetter
2014-07-23 7:37 ` Christian König
2014-07-23 7:51 ` Maarten Lankhorst
2014-07-23 7:58 ` Christian König
2014-07-23 8:07 ` Daniel Vetter
2014-07-23 8:20 ` Christian König
2014-07-23 8:25 ` Maarten Lankhorst
2014-07-23 8:42 ` Daniel Vetter
2014-07-23 8:46 ` Christian König
2014-07-23 8:54 ` Daniel Vetter
2014-07-23 9:27 ` Christian König
2014-07-23 9:30 ` Daniel Vetter
2014-07-23 9:36 ` Christian König
2014-07-23 9:38 ` Maarten Lankhorst
2014-07-23 9:39 ` Christian König
2014-07-23 9:39 ` Daniel Vetter
2014-07-23 9:44 ` Daniel Vetter
2014-07-23 9:47 ` Christian König
2014-07-23 9:52 ` Daniel Vetter
2014-07-23 9:55 ` Maarten Lankhorst
2014-07-23 10:13 ` Christian König
2014-07-23 10:52 ` Daniel Vetter
2014-07-23 12:36 ` Christian König
2014-07-23 12:42 ` Daniel Vetter
2014-07-23 13:16 ` Maarten Lankhorst
2014-07-23 14:05 ` Maarten Lankhorst
2014-07-24 13:47 ` Christian König [this message]
2014-07-23 8:01 ` Daniel Vetter
2014-07-23 8:31 ` Christian König
2014-07-23 12:35 ` Rob Clark
2014-07-22 14:05 ` Maarten Lankhorst
2014-07-22 14:24 ` Christian König
2014-07-22 14:27 ` Maarten Lankhorst
2014-07-22 14:39 ` Christian König
2014-07-22 14:47 ` Maarten Lankhorst
2014-07-22 15:16 ` Christian König
2014-07-22 15:19 ` Daniel Vetter
2014-07-22 15:42 ` Alex Deucher
2014-07-22 15:48 ` Daniel Vetter
2014-07-22 19:14 ` Jesse Barnes
2014-07-23 9:47 ` [Nouveau] " Daniel Vetter
2014-07-23 15:37 ` Jesse Barnes
2014-07-22 11:51 ` Maarten Lankhorst
2014-07-09 12:29 ` [PATCH 10/17] drm/qxl: rework to new fence interface Maarten Lankhorst
2014-07-09 12:30 ` [PATCH 11/17] drm/vmwgfx: get rid of different types of fence_flags entirely Maarten Lankhorst
2014-07-09 12:30 ` [PATCH 12/17] drm/vmwgfx: rework to new fence interface Maarten Lankhorst
2014-07-09 12:30 ` [PATCH 13/17] drm/ttm: flip the switch, and convert to dma_fence Maarten Lankhorst
2014-07-09 12:30 ` [PATCH 14/17] drm/nouveau: use rcu in nouveau_gem_ioctl_cpu_prep Maarten Lankhorst
2014-07-09 12:30 ` [PATCH 15/17] drm/radeon: use rcu waits in some ioctls Maarten Lankhorst
2014-07-09 12:30 ` [PATCH 16/17] drm/vmwgfx: use rcu in vmw_user_dmabuf_synccpu_grab Maarten Lankhorst
2014-07-09 12:30 ` [PATCH 17/17] drm/ttm: use rcu in core ttm Maarten Lankhorst
[not found] ` <CAHbf0-HaFi0px7QGfBErKenH7wDU08B5mxo_QhFJdDPC4WBDrQ@mail.gmail.com>
2014-07-09 13:21 ` [PATCH 00/17] Convert TTM to the new fence interface Maarten Lankhorst
2014-07-10 21:37 ` Thomas Hellström
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