From: Christoph Hellwig <hch@lst.de>
To: Jonathan Marek <jonathan@marek.ca>
Cc: Rob Clark <robdclark@gmail.com>, Christoph Hellwig <hch@lst.de>,
freedreno <freedreno@lists.freedesktop.org>,
Sean Paul <sean@poorly.run>, David Airlie <airlied@linux.ie>,
Daniel Vetter <daniel@ffwll.ch>,
"open list:DRM DRIVER FOR MSM ADRENO GPU"
<linux-arm-msm@vger.kernel.org>,
"open list:DRM DRIVER FOR MSM ADRENO GPU"
<dri-devel@lists.freedesktop.org>,
open list <linux-kernel@vger.kernel.org>
Subject: Re: [RESEND PATCH v2 4/5] drm/msm: add DRM_MSM_GEM_SYNC_CACHE for non-coherent cache maintenance
Date: Mon, 16 Nov 2020 18:33:46 +0100 [thread overview]
Message-ID: <20201116173346.GA24173@lst.de> (raw)
In-Reply-To: <b6e4f167-871a-5f26-46bd-d914476af519@marek.ca>
On Sat, Nov 14, 2020 at 03:07:20PM -0500, Jonathan Marek wrote:
> qcom's vulkan driver has nonCoherentAtomSize=1, and it looks like
> dma_sync_single_for_cpu() does deal in some way with the partial cache line
> case, although I'm not sure that means we can have a nonCoherentAtomSize=1.
No, it doesn't. You need to ensure ownership is managed at
dma_get_cache_alignment() granularity.
next prev parent reply other threads:[~2020-11-16 17:34 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-14 15:17 [RESEND PATCH v2 0/5] drm/msm: support for host-cached BOs Jonathan Marek
2020-11-14 15:17 ` [RESEND PATCH v2 1/5] drm/msm: add MSM_BO_CACHED_COHERENT Jonathan Marek
2020-11-14 15:17 ` [RESEND PATCH v2 2/5] dma-direct: add dma_direct_bypass() to force direct ops Jonathan Marek
2020-11-14 16:21 ` Christoph Hellwig
2020-11-14 15:17 ` [RESEND PATCH v2 3/5] drm/msm: call dma_direct_bypass() Jonathan Marek
2020-11-14 16:21 ` Christoph Hellwig
2020-11-14 15:17 ` [RESEND PATCH v2 4/5] drm/msm: add DRM_MSM_GEM_SYNC_CACHE for non-coherent cache maintenance Jonathan Marek
2020-11-14 16:24 ` Christoph Hellwig
2020-11-14 18:46 ` Rob Clark
2020-11-14 18:54 ` Jonathan Marek
2020-11-14 19:39 ` Rob Clark
2020-11-14 20:07 ` Jonathan Marek
2020-11-14 20:48 ` Rob Clark
2020-11-16 17:33 ` Christoph Hellwig [this message]
2020-11-16 17:50 ` Rob Clark
2020-11-16 17:52 ` Jonathan Marek
2020-11-29 18:51 ` Rob Clark
2020-11-16 17:27 ` [Freedreno] " Jordan Crouse
2020-11-16 17:25 ` Jordan Crouse
2020-11-14 15:17 ` [RESEND PATCH v2 5/5] drm/msm: bump up the uapi version Jonathan Marek
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