linux-kernel - Using ion memory for direct-io

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Date:   Fri, 14 Apr 2017 09:18:25 +0000
From:   "Zengtao (B)" <prime.zeng@...ilicon.com>
To:     "labbott@...hat.com" <labbott@...hat.com>,
        "sumit.semwal@...aro.org" <sumit.semwal@...aro.org>
CC:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "arve@...roid.com" <arve@...roid.com>,
        "riandrews@...roid.com" <riandrews@...roid.com>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Using ion memory for direct-io

Hi 

Currently, the ion mapped to userspace will be forced with VM_IO and VM_PFNMAP flags.
When I use the ion memory to do the direct-io, it will fail when reaching the get_user_pages,

Back to the VM_IO and VM_PFNMAP flag, there two flags are introduced by the remap_pfn_range called 
by the ion_heap_mmap_user.

>From my point of view, all ion memory(cma/vmalloc/system heap) are managed by linux vm, it
is not reasonable to have the VM_IO and VM_PFNMAP flag, but I don't any suitable function
to replace the remap_pfn_range, any suggestions?

Thanks && Regards

Zengtao