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ANDROID: dma-buf: heaps: Allow cma heaps to be configured as a module

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Allow loading cma heap as a module instead of just as a
statically built in heap.

Since there isn't a good mechanism for dmabuf lifetime tracking
it isn't safe to allow the heap drivers to be unloaded, so these
drivers do not implement any module unloading functionality and
will show up in lsmod as "[permanent]".

This patch also exports key functions from dmabuf heaps core and
the heap helper functions so they can be accessed by the module.

Cc: Laura Abbott <labbott@redhat.com>
Cc: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Liam Mark <lmark@codeaurora.org>
Cc: Pratik Patel <pratikp@codeaurora.org>
Cc: Brian Starkey <Brian.Starkey@arm.com>
Cc: Andrew F. Davis <afd@ti.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Yue Hu <huyue2@yulong.com>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: Chenbo Feng <fengc@google.com>
Cc: Alistair Strachan <astrachan@google.com>
Cc: Sandeep Patil <sspatil@google.com>
Cc: Hridya Valsaraju <hridya@google.com>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: John Stultz <john.stultz@linaro.org>
Change-Id: I8d4516899d42c0b6e145bde8a0fed1235ae46654
Bug: 155218010
Link: https://lore.kernel.org/lkml/20191025234834.28214-3-john.stultz@linaro.org/
Signed-off-by: Hridya Valsaraju <hridya@google.com>
This commit is contained in:
John Stultz
2019-10-02 03:12:09 +00:00
committed by Hridya Valsaraju
parent ab37bb9063
commit 70735d9b05
3 changed files with 4 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/dma-buf/dma-heap.c
+1
View File
@@ -236,6 +236,7 @@ void *dma_heap_get_drvdata(struct dma_heap *heap)
{
return heap->priv;
}
EXPORT_SYMBOL_GPL(dma_heap_get_drvdata);
static void dma_heap_release(struct kref *ref)
{
drivers/dma-buf/heaps/Kconfig
+1 -1
View File
@@ -6,7 +6,7 @@ config DMABUF_HEAPS_SYSTEM
is backed by pages from the buddy allocator. If in doubt, say Y.
config DMABUF_HEAPS_CMA
bool "DMA-BUF CMA Heap"
tristate "DMA-BUF CMA Heap"
depends on DMABUF_HEAPS && DMA_CMA
help
Choose this option to enable dma-buf CMA heap. This heap is backed
drivers/dma-buf/heaps/heap-helpers.c
+2
View File
@@ -24,6 +24,7 @@ void init_heap_helper_buffer(struct heap_helper_buffer *buffer,
INIT_LIST_HEAD(&buffer->attachments);
buffer->free = free;
}
EXPORT_SYMBOL_GPL(init_heap_helper_buffer);
struct dma_buf *heap_helper_export_dmabuf(struct heap_helper_buffer *buffer,
int fd_flags)
@@ -37,6 +38,7 @@ struct dma_buf *heap_helper_export_dmabuf(struct heap_helper_buffer *buffer,
return dma_buf_export(&exp_info);
}
EXPORT_SYMBOL_GPL(heap_helper_export_dmabuf);
static void *dma_heap_map_kernel(struct heap_helper_buffer *buffer)
{