From: Alyssa Rosenzweig <alyssa@collabora.com>
To: Boris Brezillon <boris.brezillon@collabora.com>
Cc: Maling list - DRI developers <dri-devel@lists.freedesktop.org>,
Steven Price <steven.price@arm.com>,
Rob Herring <robh+dt@kernel.org>,
Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>,
Jason Ekstrand <jason@jlekstrand.net>,
Robin Murphy <robin.murphy@arm.com>
Subject: Re: [RFC PATCH 0/7] drm/panfrost: Add a new submit ioctl
Date: Fri, 12 Mar 2021 21:48:23 +0000 [thread overview]
Message-ID: <YEvhp7GLAsImL4pD@maud> (raw)
In-Reply-To: <20210312192513.469462ef@collabora.com>
> > 3. Each VkCommandBuffer is two command buffers: one for compute and
> > one for binning, and you use some sort of HW synchronization mechanism
> > to handle the dependencies as you ping-pong between them.
>
> I didn't consider that option. We have a DOORBELL instruction on Bifrost
> to wake up the CPU when the GPU wants to report something (not even
> sure we have something equivalent on Midgard), but there's no
> inter-queue sync mechanism AFAICT.
I was about to say that we don't have hardware support. Even considering
DOORBELL (which AFAIK isn't piped through to anything on kbase at
least), I'm inclined to say we don't have hardware support. Option 2
(what kbase does? dunno how DDK vulkan works though) is probably our
best bet, tbh.
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next prev parent reply other threads:[~2021-03-12 21:48 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-11 9:25 [RFC PATCH 0/7] drm/panfrost: Add a new submit ioctl Boris Brezillon
2021-03-11 9:25 ` [RFC PATCH 1/7] drm/panfrost: Pass a job to panfrost_{acquire, attach_object_fences}() Boris Brezillon
2021-03-11 9:25 ` [RFC PATCH 2/7] drm/panfrost: Collect implicit and explicit deps in an XArray Boris Brezillon
2021-03-11 9:25 ` [RFC PATCH 3/7] drm/panfrost: Move the mappings collection out of panfrost_lookup_bos() Boris Brezillon
2021-03-11 9:25 ` [RFC PATCH 4/7] drm/panfrost: Add BO access flags to relax dependencies between jobs Boris Brezillon
2021-03-11 9:25 ` [RFC PATCH 5/7] drm/panfrost: Add a new ioctl to submit batches Boris Brezillon
2021-03-11 9:25 ` [RFC PATCH 6/7] drm/panfrost: Advertise the SYNCOBJ_TIMELINE feature Boris Brezillon
2021-03-11 9:25 ` [RFC PATCH 7/7] drm/panfrost: Bump minor version to reflect the feature additions Boris Brezillon
2021-03-11 12:16 ` [RFC PATCH 0/7] drm/panfrost: Add a new submit ioctl Steven Price
2021-03-11 13:00 ` Boris Brezillon
2021-03-11 16:58 ` Jason Ekstrand
2021-03-11 17:24 ` Boris Brezillon
2021-03-11 18:11 ` Jason Ekstrand
2021-03-11 22:38 ` Alyssa Rosenzweig
2021-03-12 7:31 ` Boris Brezillon
2021-03-12 15:37 ` Jason Ekstrand
2021-03-12 18:25 ` Boris Brezillon
2021-03-12 20:06 ` Boris Brezillon
2021-03-12 21:48 ` Alyssa Rosenzweig [this message]
2021-03-12 14:15 ` Boris Brezillon
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