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Add an IOCTL to check ION ABI version

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Userspace needs a way to detect ION ABI version at runtime to determine
heap IDs. CURRENT_ION_ABI_VERSION is set to 2 considering legacy and
upstream versions as 0 and 1.

Bug: 140916230
Test: make

Signed-off-by: Hridya Valsaraju <hridya@google.com>

Change-Id: Ie9d9e23c2d8323620832906d33745d599cbce6be
This commit is contained in:
Hridya Valsaraju
2019-10-02 14:32:19 -07:00
parent c8e152bc7d
commit ecbdae8679
2 changed files with 13 additions and 0 deletions
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7
include/uapi/linux/ion.h
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@@ -159,4 +159,11 @@ struct ion_heap_query {
#define ION_IOC_HEAP_QUERY _IOWR(ION_IOC_MAGIC, 8, \
struct ion_heap_query)
/**
* DOC: ION_IOC_HEAP_ABI_VERSION - return ABI version
*
* Returns ABI version for this driver
*/
#define ION_IOC_ABI_VERSION _IOR(ION_IOC_MAGIC, 9, \
__u32)
#endif /* _UAPI_LINUX_ION_H */