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misc: fastrpc: add support for FASTRPC_IOCTL_MEM_MAP/UNMAP

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Add support for IOCTL requests to map and unmap on DSP based on map
flags.

Signed-off-by: Jeya R <jeyr@codeaurora.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20220214161002.6831-3-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jeya R
2022-02-14 16:09:52 +00:00
committed by Greg Kroah-Hartman
parent 965602eabb
commit 5c1b97c7d7
2 changed files with 205 additions and 0 deletions
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include/uapi/misc/fastrpc.h
+51
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@@ -13,6 +13,37 @@
#define FASTRPC_IOCTL_MMAP _IOWR('R', 6, struct fastrpc_req_mmap)
#define FASTRPC_IOCTL_MUNMAP _IOWR('R', 7, struct fastrpc_req_munmap)
#define FASTRPC_IOCTL_INIT_ATTACH_SNS _IO('R', 8)
#define FASTRPC_IOCTL_MEM_MAP _IOWR('R', 10, struct fastrpc_mem_map)
#define FASTRPC_IOCTL_MEM_UNMAP _IOWR('R', 11, struct fastrpc_mem_unmap)
/**
* enum fastrpc_map_flags - control flags for mapping memory on DSP user process
* @FASTRPC_MAP_STATIC: Map memory pages with RW- permission and CACHE WRITEBACK.
* The driver is responsible for cache maintenance when passed
* the buffer to FastRPC calls. Same virtual address will be
* assigned for subsequent FastRPC calls.
* @FASTRPC_MAP_RESERVED: Reserved
* @FASTRPC_MAP_FD: Map memory pages with RW- permission and CACHE WRITEBACK.
* Mapping tagged with a file descriptor. User is responsible for
* CPU and DSP cache maintenance for the buffer. Get virtual address
* of buffer on DSP using HAP_mmap_get() and HAP_mmap_put() APIs.
* @FASTRPC_MAP_FD_DELAYED: Mapping delayed until user call HAP_mmap() and HAP_munmap()
* functions on DSP. It is useful to map a buffer with cache modes
* other than default modes. User is responsible for CPU and DSP
* cache maintenance for the buffer.
* @FASTRPC_MAP_FD_NOMAP: This flag is used to skip CPU mapping,
* otherwise behaves similar to FASTRPC_MAP_FD_DELAYED flag.
* @FASTRPC_MAP_MAX: max count for flags
*
*/
enum fastrpc_map_flags {
FASTRPC_MAP_STATIC = 0,
FASTRPC_MAP_RESERVED,
FASTRPC_MAP_FD = 2,
FASTRPC_MAP_FD_DELAYED,
FASTRPC_MAP_FD_NOMAP = 16,
FASTRPC_MAP_MAX,
};
struct fastrpc_invoke_args {
__u64 ptr;
@@ -49,9 +80,29 @@ struct fastrpc_req_mmap {
__u64 vaddrout; /* dsp virtual address */
};
struct fastrpc_mem_map {
__s32 version;
__s32 fd; /* fd */
__s32 offset; /* buffer offset */
__u32 flags; /* flags defined in enum fastrpc_map_flags */
__u64 vaddrin; /* buffer virtual address */
__u64 length; /* buffer length */
__u64 vaddrout; /* [out] remote virtual address */
__s32 attrs; /* buffer attributes used for SMMU mapping */
__s32 reserved[4];
};
struct fastrpc_req_munmap {
__u64 vaddrout; /* address to unmap */
__u64 size; /* size */
};
struct fastrpc_mem_unmap {
__s32 vesion;
__s32 fd; /* fd */
__u64 vaddr; /* remote process (dsp) virtual address */
__u64 length; /* buffer size */
__s32 reserved[5];
};
#endif /* __QCOM_FASTRPC_H__ */