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authorOded Gabbay <oded.gabbay@gmail.com>2020-07-03 20:46:12 +0300
committerOded Gabbay <oded.gabbay@gmail.com>2020-07-10 19:53:03 +0300
commite38bfd30e08802d9661efffb8c048bd53a3acfc4 (patch)
tree7c4e53e360089c57d1d89b848ea8f1eb13d6f168 /Documentation/ABI
parent2edc66e22ba1af33020ff8b75fe1a2b055cdb73f (diff)
habanalabs: set clock gating per engine
For debugging purposes, we need to allow the root user better control of the clock gating feature of the DMA and compute engines. Therefore, change the clock gating debugfs interface to be bitmask instead of true/false. Each bit represents a different engine, according to gaudi_engine_id enum. See debugfs documentation for more details. Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com> Reviewed-by: Omer Shpigelman <oshpigelman@habana.ai>
Diffstat (limited to 'Documentation/ABI')
-rw-r--r--Documentation/ABI/testing/debugfs-driver-habanalabs11
1 files changed, 10 insertions, 1 deletions
diff --git a/Documentation/ABI/testing/debugfs-driver-habanalabs b/Documentation/ABI/testing/debugfs-driver-habanalabs
index f6d9c2a8d528..2e9ae311e02d 100644
--- a/Documentation/ABI/testing/debugfs-driver-habanalabs
+++ b/Documentation/ABI/testing/debugfs-driver-habanalabs
@@ -16,7 +16,16 @@ Description: Allow the root user to disable/enable in runtime the clock
gating mechanism in Gaudi. Due to how Gaudi is built, the
clock gating needs to be disabled in order to access the
registers of the TPC and MME engines. This is sometimes needed
- during debug by the user and hence the user needs this option
+ during debug by the user and hence the user needs this option.
+ The user can supply a bitmask value, each bit represents
+ a different engine to disable/enable its clock gating feature.
+ The bitmask is composed of 20 bits:
+ 0 - 7 : DMA channels
+ 8 - 11 : MME engines
+ 12 - 19 : TPC engines
+ The bit's location of a specific engine can be determined
+ using (1 << GAUDI_ENGINE_ID_*). GAUDI_ENGINE_ID_* values
+ are defined in uapi habanalabs.h file in enum gaudi_engine_id
What: /sys/kernel/debug/habanalabs/hl<n>/command_buffers
Date: Jan 2019