Re: about mmap dma-buf and sync

From: Tiago Vignatti <tiago.vignatti@intel.com>
To: dri-devel@lists.freedesktop.org
Subject: Re: about mmap dma-buf and sync
Date: Mon, 24 Aug 2015 20:03:59 -0300	[thread overview]
Message-ID: <55DBA2DF.8070503@intel.com> (raw)
In-Reply-To: <55DB5BF2.5070508@intel.com>

On 08/24/2015 03:01 PM, Tiago Vignatti wrote:
> yup, I think so. So IIUC the main changes needed for the drivers
> implement 2D sync lies in the dma_buf_sync_2d structure only. I.e.
> there's nothing really to be changed in the common code, right?

Do we have any special requirements in how we want pass the sync 
information to the drivers? I was thinking to push the whole 
responsibility for them, something like:

+int dma_buf_begin_cpu_access(struct dma_buf *dma_buf, size_t stride_bytes,
+                            size_t bytes_per_pixel, size_t num_regions,
+                            struct dma_buf_sync_region regions[], enum 
dma_data_direction dir);

Daniel Vetter mentioned about dma-buf design that should not track 
metadata but I haven't read anything about it, so do you think this 
looks alright?

Tiago
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