diff options
| author | Ohad Sharabi <osharabi@habana.ai> | 2021-12-20 13:30:35 +0200 |
|---|---|---|
| committer | Oded Gabbay <ogabbay@kernel.org> | 2021-12-26 14:40:25 +0200 |
| commit | 60bf3bfb5a37965fc33fa00f19a2074dd48077c5 (patch) | |
| tree | c3a5eeb7a88064c798efa56c3fb4d231b6d233a7 /drivers/misc | |
| parent | f297a0e9fe7d4b4d8a24d2ce97446f2faaf9d51b (diff) | |
habanalabs: handle skip multi-CS if handling not done
This patch fixes issue in which we have timeout for multi-CS although
the CS in the list actually completed.
Example scenario (the two threads marked as WAIT for the thread that
handles the wait_for_multi_cs and CMPL as the thread that signal
completion for both CS and multi-CS):
1. Submit CS with sequence X
2. [WAIT]: call wait_for_multi_cs with single CS X
3. [CMPL]: CS X do invoke complete_all for both CS and multi-CS
(multi_cs_completion_done still false)
4. [WAIT]: enter poll_fences, reinit the completion and find the CS
as completed when asking on the fence but multi_cs_done is
still false it returns that no CS actually completed
5. [CMPL]: set multi_cs_handling_done as true
6. [WAIT]: wait for completion but no CS to awake the wait context
and hence wait till timeout
Solution: if CS detected as completed in poll_fences but multi_cs_done
is still false invoke complete_all to the multi-CS completion
and so it will not go to sleep in wait_for_completion but
rather will have a "second chance" to wait for
multi_cs_completion_done.
Signed-off-by: Ohad Sharabi <osharabi@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/habanalabs/common/command_submission.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/misc/habanalabs/common/command_submission.c b/drivers/misc/habanalabs/common/command_submission.c index 7073fa6b9f0f..d39343f90bc2 100644 --- a/drivers/misc/habanalabs/common/command_submission.c +++ b/drivers/misc/habanalabs/common/command_submission.c @@ -2453,9 +2453,19 @@ static int hl_cs_poll_fences(struct multi_cs_data *mcs_data, struct multi_cs_com * returns to user indicating CS completed before it finished * all of its mcs handling, to avoid race the next time the * user waits for mcs. + * note: when reaching this case fence is definitely not NULL + * but NULL check was added to overcome static analysis */ - if (!fence->mcs_handling_done) + if (fence && !fence->mcs_handling_done) { + /* + * in case multi CS is completed but MCS handling not done + * we "complete" the multi CS to prevent it from waiting + * until time-out and the "multi-CS handling done" will have + * another chance at the next iteration + */ + complete_all(&mcs_compl->completion); break; + } mcs_data->completion_bitmap |= BIT(i); /* |