[RFC PATCH 06/12] staging: android: ion: Remove crufty cache support

Laura Abbott
2017-03-03T18:46:03Z

On 03/03/2017 08:39 AM, Laurent Pinchart wrote:
> Hi Daniel,
>
> On Friday 03 Mar 2017 10:56:54 Daniel Vetter wrote:
>> On Thu, Mar 02, 2017 at 01:44:38PM -0800, Laura Abbott wrote:
>>> Now that we call dma_map in the dma_buf API callbacks there is no need
>>> to use the existing cache APIs. Remove the sync ioctl and the existing
>>> bad dma_sync calls. Explicit caching can be handled with the dma_buf
>>> sync API.
>>>
>>> Signed-off-by: Laura Abbott <labbott@redhat.com>
>>> ---
>>>
>>> drivers/staging/android/ion/ion-ioctl.c | 5 ----
>>> drivers/staging/android/ion/ion.c | 40 --------------------
>>> drivers/staging/android/ion/ion_carveout_heap.c | 6 ----
>>> drivers/staging/android/ion/ion_chunk_heap.c | 6 ----
>>> drivers/staging/android/ion/ion_page_pool.c | 3 --
>>> drivers/staging/android/ion/ion_system_heap.c | 5 ----
>>> 6 files changed, 65 deletions(-)
>>>
>>> diff --git a/drivers/staging/android/ion/ion-ioctl.c
>>> b/drivers/staging/android/ion/ion-ioctl.c index 5b2e93f..f820d77 100644
>>> --- a/drivers/staging/android/ion/ion-ioctl.c
>>> +++ b/drivers/staging/android/ion/ion-ioctl.c
>>> @@ -146,11 +146,6 @@ long ion_ioctl(struct file *filp, unsigned int cmd,
>>> unsigned long arg)>
>>> data.handle.handle = handle->id;
>>>
>>> break;
>>>
>>> }
>>>
>>> - case ION_IOC_SYNC:
>>> - {
>>> - ret = ion_sync_for_device(client, data.fd.fd);
>>> - break;
>>> - }
>>
>> You missed the case ION_IOC_SYNC: in compat_ion.c.
>>
>> While at it: Should we also remove the entire custom_ioctl infrastructure?
>> It's entirely unused afaict, and for a pure buffer allocator I don't see
>> any need to have custom ioctl.
>
> I second that, if you want to make ion a standard API, then we certainly don't
> want any custom ioctl.
>
>> More code to remove potentially:
>> - The entire compat ioctl stuff - would be an abi break, but I guess if we
>> pick the 32bit abi and clean up the uapi headers we'll be mostly fine.
>> would allow us to remove compat_ion.c entirely.
>>
>> - ION_IOC_IMPORT: With this ion is purely an allocator, so not sure we
>> still need to be able to import anything. All the cache flushing/mapping
>> is done through dma-buf ops/ioctls.
>>
>>

Good point to all of the above. I was considering keeping the import around
for backwards compatibility reasons but given how much other stuff is being
potentially broken, everything should just get ripped out.

Thanks,
Laura