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habanalabs: add debugfs write64/read64

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Allow debug user to write/read 64-bit data through debugfs.
This will expedite the dump process of the (large) internal
memories of the device done during debug.

Signed-off-by: Moti Haimovski <mhaimovski@habana.ai>
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
This commit is contained in:
Moti Haimovski
2019-11-12 09:40:11 +02:00
committed by Oded Gabbay
parent 0c002ceb39
commit 5cce51464c
4 changed files with 179 additions and 0 deletions
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14
Documentation/ABI/testing/debugfs-driver-habanalabs
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@@ -43,6 +43,20 @@ Description: Allows the root user to read or write directly through the
If the IOMMU is disabled, it also allows the root user to read
or write from the host a device VA of a host mapped memory
What: /sys/kernel/debug/habanalabs/hl<n>/data64
Date: Jan 2020
KernelVersion: 5.6
Contact: oded.gabbay@gmail.com
Description: Allows the root user to read or write 64 bit data directly
through the device's PCI bar. Writing to this file generates a
write transaction while reading from the file generates a read
transaction. This custom interface is needed (instead of using
the generic Linux user-space PCI mapping) because the DDR bar
is very small compared to the DDR memory and only the driver can
move the bar before and after the transaction.
If the IOMMU is disabled, it also allows the root user to read
or write from the host a device VA of a host mapped memory
What: /sys/kernel/debug/habanalabs/hl<n>/device
Date: Jan 2019
KernelVersion: 5.1