linux-kernel - [PATCH 10/10] accel/habanalabs: expose module id through sysfs

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Date:   Wed, 15 Nov 2023 18:39:12 +0200
From:   Oded Gabbay <ogabbay@...nel.org>
To:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     Dani Liberman <dliberman@...ana.ai>
Subject: [PATCH 10/10] accel/habanalabs: expose module id through sysfs

From: Dani Liberman <dliberman@...ana.ai>

Module ID exposes the physical location of the device in the server,
from the pov of the devices in regard to how they are connected by
internal fabric.

This information is already exposed in our INFO ioctl, but there are
utilities and scripts running in data-center which are already
accessing sysfs for topology information and it is easier for them
to continue getting that information from sysfs instead of opening
a file descriptor.

Signed-off-by: Dani Liberman <dliberman@...ana.ai>
Reviewed-by: Oded Gabbay <ogabbay@...nel.org>
Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 Documentation/ABI/testing/sysfs-driver-habanalabs |  6 ++++++
 drivers/accel/habanalabs/common/sysfs.c           | 10 ++++++++++
 2 files changed, 16 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-driver-habanalabs b/Documentation/ABI/testing/sysfs-driver-habanalabs
index c63ca1ad500d..89fe3b09d4ad 100644
--- a/Documentation/ABI/testing/sysfs-driver-habanalabs
+++ b/Documentation/ABI/testing/sysfs-driver-habanalabs
@@ -149,6 +149,12 @@ Contact:        ogabbay@...nel.org
 Description:    Displays the current clock frequency, in Hz, of the MME compute
                 engine. This property is valid only for the Goya ASIC family
 
+What:           /sys/class/accel/accel<n>/device/module_id
+Date:           Nov 2023
+KernelVersion:  not yet upstreamed
+Contact:        ogabbay@...nel.org
+Description:    Displays the device's module id
+
 What:           /sys/class/accel/accel<n>/device/pci_addr
 Date:           Jan 2019
 KernelVersion:  5.1
diff --git a/drivers/accel/habanalabs/common/sysfs.c b/drivers/accel/habanalabs/common/sysfs.c
index 278606373055..8d2164691d81 100644
--- a/drivers/accel/habanalabs/common/sysfs.c
+++ b/drivers/accel/habanalabs/common/sysfs.c
@@ -386,6 +386,14 @@ static ssize_t security_enabled_show(struct device *dev,
 	return sprintf(buf, "%d\n", hdev->asic_prop.fw_security_enabled);
 }
 
+static ssize_t module_id_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct hl_device *hdev = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%u\n", le32_to_cpu(hdev->asic_prop.cpucp_info.card_location));
+}
+
 static DEVICE_ATTR_RO(armcp_kernel_ver);
 static DEVICE_ATTR_RO(armcp_ver);
 static DEVICE_ATTR_RO(cpld_ver);
@@ -405,6 +413,7 @@ static DEVICE_ATTR_RO(thermal_ver);
 static DEVICE_ATTR_RO(uboot_ver);
 static DEVICE_ATTR_RO(fw_os_ver);
 static DEVICE_ATTR_RO(security_enabled);
+static DEVICE_ATTR_RO(module_id);
 
 static struct bin_attribute bin_attr_eeprom = {
 	.attr = {.name = "eeprom", .mode = (0444)},
@@ -430,6 +439,7 @@ static struct attribute *hl_dev_attrs[] = {
 	&dev_attr_uboot_ver.attr,
 	&dev_attr_fw_os_ver.attr,
 	&dev_attr_security_enabled.attr,
+	&dev_attr_module_id.attr,
 	NULL,
 };
 
-- 
2.34.1