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habanalabs: add comments in uapi/misc/habanalabs.h 

Add comment about minimum and maximum size of command buffer.
Add some text about the expected input of CS IOCTL.

Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Oded Gabbay 2019-02-28 11:55:44 +02:00 committed by Greg Kroah-Hartman
parent 3dccd18787
commit 541664d360
1 changed files with 9 additions and 1 deletions
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10
include/uapi/misc/habanalabs.h
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@ -112,7 +112,9 @@ struct hl_cb_in {
__u64 cb_handle;
/* HL_CB_OP_* */
__u32 op;
/* Size of CB. Minimum requested size must be PAGE_SIZE */
/* Size of CB. Maximum size is 2MB. The minimum size that will be
* allocated, regardless of this parameter's value, is PAGE_SIZE
*/
__u32 cb_size;
/* Context ID - Currently not in use */
__u32 ctx_id;
@ -364,6 +366,12 @@ union hl_mem_args {
* internal. The driver will get completion notifications from the device only
* on JOBS which are enqueued in the external queues.
*
* For jobs on external queues, the user needs to create command buffers
* through the CB ioctl and give the CB's handle to the CS ioctl. For jobs on
* internal queues, the user needs to prepare a "command buffer" with packets
* on either the SRAM or DRAM, and give the device address of that buffer to
* the CS ioctl.
*
* This IOCTL is asynchronous in regard to the actual execution of the CS. This
* means it returns immediately after ALL the JOBS were enqueued on their
* relevant queues. Therefore, the user mustn't assume the CS has been completed