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ANDROID: staging: ion: export some ion symbols

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Background:
  We can allocate buffer from ion_system_heap for general case,
if the buffer is needed to access by HW, we need to map/unmap
dma_address by iommu driver before and after HW engine access for
iommu case. For example, if the same buffer is accessed by three
HW engines, then every device driver needs to map/unmap dma_address
by iommu driver respectively.
  For MTK platform, all the multimedia HW engines use the same
iommu HW and share the same iommu page table, so multiple map/unmap
dma_address by iommu driver maybe reduce performance seriously for
above case, especially for big size buffer. In order to improve
performance for MTK platform, we want to add ion_mtk_iommu_heap
and implement map/unmap dma_address by ion_mtk_iommu_heap:
  a.heap->buf_ops.map_dma_buf: If more than one attachments map
dma_address by iommu driver about the same buffer, the function
only map once in first attachment, the other attachments of buffer
copy sg_table which has already mapped to respective sg_table directly
and don't mapping dma_address truly.
  b.heap->buf_ops.unmap_dma_buf: Do nothing.
  c.heap->buf_ops.release: unmap dma_address by iommu driver about buffer
and free the buffer.

Based on above description:
We will build ion_mtk_iommu_heap as a kernel module and ion_mtk_iommu_heap
also use some APIs like ion_system_heap but they not do export symbol
ion_page_pool_alloc()
ion_page_pool_free()
ion_page_pool_nr_pages()
ion_page_pool_shrink()
ion_page_pool_create()
ion_page_pool_destroy()

Bug: 158729041
Bug: 170264063
Change-Id: If3897d5e0105edefe03a51ac52c7b3d423aaa988
Signed-off-by: Chao Hao <chao.hao@mediatek.com>
Signed-off-by: Chun-Hung Wu <chun-hung.wu@mediatek.com>
(cherry picked from commit 34364883b1f7cf8aed0e3a36e38aa7803c73b203)
Signed-off-by: J. Avila <elavila@google.com>
(cherry picked from commit 48979298f2c9f814293323e05754a9c1f2038146)
Signed-off-by: Will McVicker <willmcvicker@google.com>
(cherry picked from commit 4dad2d6066b354f9fb087430fca714ffdc05790f)
Signed-off-by: Will McVicker <willmcvicker@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Chao Hao
2020-08-12 17:28:44 +08:00
committed by Greg Kroah-Hartman
parent b3ac75c1e3
commit 2c6dc2a69e
1 changed files with 6 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/staging/android/ion/heaps/ion_page_pool.c
+6
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@@ -79,6 +79,7 @@ struct page *ion_page_pool_alloc(struct ion_page_pool *pool)
return page;
}
EXPORT_SYMBOL_GPL(ion_page_pool_alloc);
void ion_page_pool_free(struct ion_page_pool *pool, struct page *page)
{
@@ -86,6 +87,7 @@ void ion_page_pool_free(struct ion_page_pool *pool, struct page *page)
ion_page_pool_add(pool, page);
}
EXPORT_SYMBOL_GPL(ion_page_pool_free);
static int ion_page_pool_total(struct ion_page_pool *pool, bool high)
{
@@ -107,6 +109,7 @@ int ion_page_pool_nr_pages(struct ion_page_pool *pool)
return nr_total_pages;
}
EXPORT_SYMBOL_GPL(ion_page_pool_nr_pages);
int ion_page_pool_shrink(struct ion_page_pool *pool, gfp_t gfp_mask,
int nr_to_scan)
@@ -141,6 +144,7 @@ int ion_page_pool_shrink(struct ion_page_pool *pool, gfp_t gfp_mask,
return freed;
}
EXPORT_SYMBOL_GPL(ion_page_pool_shrink);
struct ion_page_pool *ion_page_pool_create(gfp_t gfp_mask, unsigned int order)
{
@@ -159,8 +163,10 @@ struct ion_page_pool *ion_page_pool_create(gfp_t gfp_mask, unsigned int order)
return pool;
}
EXPORT_SYMBOL_GPL(ion_page_pool_create);
void ion_page_pool_destroy(struct ion_page_pool *pool)
{
kfree(pool);
}
EXPORT_SYMBOL_GPL(ion_page_pool_destroy);