Re: [PATCHv3 08/22] staging: android: ion: Remove crufty cache support

[Archit Taneja <architt@xxxxxxxxxxxxxx>]

Hi,

On 04/04/2017 12:27 AM, 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.

We could get rid of the ION_FLAG_CACHED_NEEDS_SYNC flag in this patch
too.

Thanks,
Archit

> Signed-off-by: Laura Abbott <labbott@xxxxxxxxxx>
> ---
>  drivers/staging/android/ion/compat_ion.c        |  1 -
>  drivers/staging/android/ion/ion-ioctl.c         |  6 ----
>  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_priv.h          | 13 --------
>  drivers/staging/android/ion/ion_system_heap.c   |  5 ----
>  drivers/staging/android/uapi/ion.h              | 10 -------
>  9 files changed, 90 deletions(-)
>
> diff --git a/drivers/staging/android/ion/compat_ion.c b/drivers/staging/android/ion/compat_ion.c
> index 9a978d2..b892d3a 100644
> --- a/drivers/staging/android/ion/compat_ion.c
> +++ b/drivers/staging/android/ion/compat_ion.c
> @@ -186,7 +186,6 @@ long compat_ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
>  	case ION_IOC_SHARE:
>  	case ION_IOC_MAP:
>  	case ION_IOC_IMPORT:
> -	case ION_IOC_SYNC:
>  		return filp->f_op->unlocked_ioctl(filp, cmd,
>  						(unsigned long)compat_ptr(arg));
>  	default:
> diff --git a/drivers/staging/android/ion/ion-ioctl.c b/drivers/staging/android/ion/ion-ioctl.c
> index 5b2e93f..e096bcd 100644
> --- a/drivers/staging/android/ion/ion-ioctl.c
> +++ b/drivers/staging/android/ion/ion-ioctl.c
> @@ -51,7 +51,6 @@ static int validate_ioctl_arg(unsigned int cmd, union ion_ioctl_arg *arg)
>  static unsigned int ion_ioctl_dir(unsigned int cmd)
>  {
>  	switch (cmd) {
> -	case ION_IOC_SYNC:
>  	case ION_IOC_FREE:
>  	case ION_IOC_CUSTOM:
>  		return _IOC_WRITE;
> @@ -146,11 +145,6 @@ 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;
> -	}
>  	case ION_IOC_CUSTOM:
>  	{
>  		if (!dev->custom_ioctl)
> diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
> index 226ea1f..8757164 100644
> --- a/drivers/staging/android/ion/ion.c
> +++ b/drivers/staging/android/ion/ion.c
> @@ -863,22 +863,6 @@ static void ion_unmap_dma_buf(struct dma_buf_attachment *attachment,
>  	dma_unmap_sg(attachment->dev, table->sgl, table->nents, direction);
>  }
>
> -void ion_pages_sync_for_device(struct device *dev, struct page *page,
> -			       size_t size, enum dma_data_direction dir)
> -{
> -	struct scatterlist sg;
> -
> -	sg_init_table(&sg, 1);
> -	sg_set_page(&sg, page, size, 0);
> -	/*
> -	 * This is not correct - sg_dma_address needs a dma_addr_t that is valid
> -	 * for the targeted device, but this works on the currently targeted
> -	 * hardware.
> -	 */
> -	sg_dma_address(&sg) = page_to_phys(page);
> -	dma_sync_sg_for_device(dev, &sg, 1, dir);
> -}
> -
>  static int ion_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma)
>  {
>  	struct ion_buffer *buffer = dmabuf->priv;
> @@ -1097,30 +1081,6 @@ struct ion_handle *ion_import_dma_buf_fd(struct ion_client *client, int fd)
>  }
>  EXPORT_SYMBOL(ion_import_dma_buf_fd);
>
> -int ion_sync_for_device(struct ion_client *client, int fd)
> -{
> -	struct dma_buf *dmabuf;
> -	struct ion_buffer *buffer;
> -
> -	dmabuf = dma_buf_get(fd);
> -	if (IS_ERR(dmabuf))
> -		return PTR_ERR(dmabuf);
> -
> -	/* if this memory came from ion */
> -	if (dmabuf->ops != &dma_buf_ops) {
> -		pr_err("%s: can not sync dmabuf from another exporter\n",
> -		       __func__);
> -		dma_buf_put(dmabuf);
> -		return -EINVAL;
> -	}
> -	buffer = dmabuf->priv;
> -
> -	dma_sync_sg_for_device(NULL, buffer->sg_table->sgl,
> -			       buffer->sg_table->nents, DMA_BIDIRECTIONAL);
> -	dma_buf_put(dmabuf);
> -	return 0;
> -}
> -
>  int ion_query_heaps(struct ion_client *client, struct ion_heap_query *query)
>  {
>  	struct ion_device *dev = client->dev;
> diff --git a/drivers/staging/android/ion/ion_carveout_heap.c b/drivers/staging/android/ion/ion_carveout_heap.c
> index 9bf8e98..e0e360f 100644
> --- a/drivers/staging/android/ion/ion_carveout_heap.c
> +++ b/drivers/staging/android/ion/ion_carveout_heap.c
> @@ -100,10 +100,6 @@ static void ion_carveout_heap_free(struct ion_buffer *buffer)
>
>  	ion_heap_buffer_zero(buffer);
>
> -	if (ion_buffer_cached(buffer))
> -		dma_sync_sg_for_device(NULL, table->sgl, table->nents,
> -				       DMA_BIDIRECTIONAL);
> -
>  	ion_carveout_free(heap, paddr, buffer->size);
>  	sg_free_table(table);
>  	kfree(table);
> @@ -128,8 +124,6 @@ struct ion_heap *ion_carveout_heap_create(struct ion_platform_heap *heap_data)
>  	page = pfn_to_page(PFN_DOWN(heap_data->base));
>  	size = heap_data->size;
>
> -	ion_pages_sync_for_device(NULL, page, size, DMA_BIDIRECTIONAL);
> -
>  	ret = ion_heap_pages_zero(page, size, pgprot_writecombine(PAGE_KERNEL));
>  	if (ret)
>  		return ERR_PTR(ret);
> diff --git a/drivers/staging/android/ion/ion_chunk_heap.c b/drivers/staging/android/ion/ion_chunk_heap.c
> index 8c41889..46e13f6 100644
> --- a/drivers/staging/android/ion/ion_chunk_heap.c
> +++ b/drivers/staging/android/ion/ion_chunk_heap.c
> @@ -101,10 +101,6 @@ static void ion_chunk_heap_free(struct ion_buffer *buffer)
>
>  	ion_heap_buffer_zero(buffer);
>
> -	if (ion_buffer_cached(buffer))
> -		dma_sync_sg_for_device(NULL, table->sgl, table->nents,
> -				       DMA_BIDIRECTIONAL);
> -
>  	for_each_sg(table->sgl, sg, table->nents, i) {
>  		gen_pool_free(chunk_heap->pool, page_to_phys(sg_page(sg)),
>  			      sg->length);
> @@ -132,8 +128,6 @@ struct ion_heap *ion_chunk_heap_create(struct ion_platform_heap *heap_data)
>  	page = pfn_to_page(PFN_DOWN(heap_data->base));
>  	size = heap_data->size;
>
> -	ion_pages_sync_for_device(NULL, page, size, DMA_BIDIRECTIONAL);
> -
>  	ret = ion_heap_pages_zero(page, size, pgprot_writecombine(PAGE_KERNEL));
>  	if (ret)
>  		return ERR_PTR(ret);
> diff --git a/drivers/staging/android/ion/ion_page_pool.c b/drivers/staging/android/ion/ion_page_pool.c
> index aea89c1..532eda7 100644
> --- a/drivers/staging/android/ion/ion_page_pool.c
> +++ b/drivers/staging/android/ion/ion_page_pool.c
> @@ -30,9 +30,6 @@ static void *ion_page_pool_alloc_pages(struct ion_page_pool *pool)
>
>  	if (!page)
>  		return NULL;
> -	if (!pool->cached)
> -		ion_pages_sync_for_device(NULL, page, PAGE_SIZE << pool->order,
> -					  DMA_BIDIRECTIONAL);
>  	return page;
>  }
>
> diff --git a/drivers/staging/android/ion/ion_priv.h b/drivers/staging/android/ion/ion_priv.h
> index 297d99d..4fc7026 100644
> --- a/drivers/staging/android/ion/ion_priv.h
> +++ b/drivers/staging/android/ion/ion_priv.h
> @@ -440,21 +440,8 @@ void ion_page_pool_free(struct ion_page_pool *pool, struct page *page);
>  int ion_page_pool_shrink(struct ion_page_pool *pool, gfp_t gfp_mask,
>  			  int nr_to_scan);
>
> -/**
> - * ion_pages_sync_for_device - cache flush pages for use with the specified
> - *                             device
> - * @dev:		the device the pages will be used with
> - * @page:		the first page to be flushed
> - * @size:		size in bytes of region to be flushed
> - * @dir:		direction of dma transfer
> - */
> -void ion_pages_sync_for_device(struct device *dev, struct page *page,
> -		size_t size, enum dma_data_direction dir);
> -
>  long ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
>
> -int ion_sync_for_device(struct ion_client *client, int fd);
> -
>  struct ion_handle *ion_handle_get_by_id_nolock(struct ion_client *client,
>  						int id);
>
> diff --git a/drivers/staging/android/ion/ion_system_heap.c b/drivers/staging/android/ion/ion_system_heap.c
> index 6cb2fe7..a33331b 100644
> --- a/drivers/staging/android/ion/ion_system_heap.c
> +++ b/drivers/staging/android/ion/ion_system_heap.c
> @@ -75,9 +75,6 @@ static struct page *alloc_buffer_page(struct ion_system_heap *heap,
>
>  	page = ion_page_pool_alloc(pool);
>
> -	if (cached)
> -		ion_pages_sync_for_device(NULL, page, PAGE_SIZE << order,
> -					  DMA_BIDIRECTIONAL);
>  	return page;
>  }
>
> @@ -401,8 +398,6 @@ static int ion_system_contig_heap_allocate(struct ion_heap *heap,
>
>  	buffer->sg_table = table;
>
> -	ion_pages_sync_for_device(NULL, page, len, DMA_BIDIRECTIONAL);
> -
>  	return 0;
>
>  free_table:
> diff --git a/drivers/staging/android/uapi/ion.h b/drivers/staging/android/uapi/ion.h
> index 14cd873..c3a87a5 100644
> --- a/drivers/staging/android/uapi/ion.h
> +++ b/drivers/staging/android/uapi/ion.h
> @@ -207,16 +207,6 @@ struct ion_heap_query {
>  #define ION_IOC_IMPORT		_IOWR(ION_IOC_MAGIC, 5, struct ion_fd_data)
>
>  /**
> - * DOC: ION_IOC_SYNC - syncs a shared file descriptors to memory
> - *
> - * Deprecated in favor of using the dma_buf api's correctly (syncing
> - * will happen automatically when the buffer is mapped to a device).
> - * If necessary should be used after touching a cached buffer from the cpu,
> - * this will make the buffer in memory coherent.
> - */
> -#define ION_IOC_SYNC		_IOWR(ION_IOC_MAGIC, 7, struct ion_fd_data)
> -
> -/**
>   * DOC: ION_IOC_CUSTOM - call architecture specific ion ioctl
>   *
>   * Takes the argument of the architecture specific ioctl to call and

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