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authorMoti Haimovski <mhaimovski@habana.ai>2019-11-12 10:40:11 +0300
committerOded Gabbay <oded.gabbay@gmail.com>2020-03-24 11:54:16 +0300
commit5cce51464c61b868157e578261d45fe389e81e54 (patch)
tree594d4962f55cc80f74de4ee33b69b1161387e807 /Documentation/ABI/testing/debugfs-driver-habanalabs
parent0c002ceb39feb26c53ed55ae490b7e6d3b0e6904 (diff)
downloadlinux-5cce51464c61b868157e578261d45fe389e81e54.tar.xz
habanalabs: add debugfs write64/read64
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>
Diffstat (limited to 'Documentation/ABI/testing/debugfs-driver-habanalabs')
-rw-r--r--Documentation/ABI/testing/debugfs-driver-habanalabs14
1 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/debugfs-driver-habanalabs b/Documentation/ABI/testing/debugfs-driver-habanalabs
index f0ac14b70ecb..a73601c5121e 100644
--- a/Documentation/ABI/testing/debugfs-driver-habanalabs
+++ b/Documentation/ABI/testing/debugfs-driver-habanalabs
@@ -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