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habanalabs: add wait-for-multi-CS uAPI

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When user sends multiple CSs, waiting for each CS is not efficient
as it involves many user-kernel context switches.

In order to address this issue we add support to "wait on multiple CSs"
using a new uAPI which can wait on maximum of 32 CSs. The new uAPI is
defined using a new flag - WAIT_FOR_MULTI_CS - in the wait_for_cs IOCTL.

The input parameters for this uAPI will be:
@seq: user pointer to an array of up to 32 CS's sequence numbers.
@seq_array_len: length of sequence array.
@timeout_us: timeout for waiting for any CS.

The output paramateres for this API will be:
@status: multi CS ioctl completion status (dedicated status was added as
         well).
@flags: bitmap of output flags of the CS.
@cs_completion_map: bitmap for multi CS, if CS sequence that was placed
                    in index N in input seq array has completed- the N-th
		    bit in cs_completion_map will be 1, otherwise it will
		    be 0.
@timestamp_nsec: timestamp of the first completed CS

Signed-off-by: Ohad Sharabi <osharabi@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
This commit is contained in:
Ohad Sharabi
2021-06-14 22:18:41 +03:00
committed by Oded Gabbay
parent c457d5abf8
commit 215f0c1775
8 changed files with 556 additions and 5 deletions
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include/uapi/misc/habanalabs.h
+21 -2
View File
@@ -735,11 +735,18 @@ union hl_cs_args {
#define HL_WAIT_CS_FLAGS_INTERRUPT 0x2
#define HL_WAIT_CS_FLAGS_INTERRUPT_MASK 0xFFF00000
#define HL_WAIT_CS_FLAGS_MULTI_CS 0x4
#define HL_WAIT_MULTI_CS_LIST_MAX_LEN 32
struct hl_wait_cs_in {
union {
struct {
/* Command submission sequence number */
/*
* In case of wait_cs holds the CS sequence number.
* In case of wait for multi CS hold a user pointer to
* an array of CS sequence numbers
*/
__u64 seq;
/* Absolute timeout to wait for command submission
* in microseconds
@@ -767,12 +774,17 @@ struct hl_wait_cs_in {
/* Context ID - Currently not in use */
__u32 ctx_id;
/* HL_WAIT_CS_FLAGS_*
* If HL_WAIT_CS_FLAGS_INTERRUPT is set, this field should include
* interrupt id according to HL_WAIT_CS_FLAGS_INTERRUPT_MASK, in order
* not to specify an interrupt id ,set mask to all 1s.
*/
__u32 flags;
/* Multi CS API info- valid entries in multi-CS array */
__u8 seq_arr_len;
__u8 pad[7];
};
#define HL_WAIT_CS_STATUS_COMPLETED 0
@@ -789,8 +801,15 @@ struct hl_wait_cs_out {
__u32 status;
/* HL_WAIT_CS_STATUS_FLAG* */
__u32 flags;
/* valid only if HL_WAIT_CS_STATUS_FLAG_TIMESTAMP_VLD is set */
/*
* valid only if HL_WAIT_CS_STATUS_FLAG_TIMESTAMP_VLD is set
* for wait_cs: timestamp of CS completion
* for wait_multi_cs: timestamp of FIRST CS completion
*/
__s64 timestamp_nsec;
/* multi CS completion bitmap */
__u32 cs_completion_map;
__u32 pad;
};
union hl_wait_cs_args {