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accel/habanalabs: add parent_device sysfs attribute 

The device debugfs directory was modified to be named as the
device-name.
This name is the parent device name, i.e. either the PCI address in case
of an ASIC, or the simulator device name in case of a simulator.

This change makes it more difficult for a user to access the debugfs
directory for a specific accel device, because he can't just use the
accel minor id, but he needs to do more device-dependent operations to
get the device name.

To make it easier to get this name, add a 'parent_device' sysfs
attribute that the user can read using the minor id before accessing
debugfs.

Signed-off-by: Tomer Tayar <ttayar@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
This commit is contained in:
Tomer Tayar 2023-05-03 13:19:17 +03:00 committed by Oded Gabbay
parent cf0719a8a3
commit aa5cea38ce
3 changed files with 18 additions and 0 deletions
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6
Documentation/ABI/testing/sysfs-driver-habanalabs
View File

@ -155,6 +155,12 @@ KernelVersion: not yet upstreamed
Contact: ogabbay@kernel.org
Description: Displays the device's module id
What: /sys/class/accel/accel<n>/device/parent_device
Date: Nov 2023
KernelVersion: 6.8
Contact: ttayar@habana.ai
Description: Displays the name of the parent device of the accel device
What: /sys/class/accel/accel<n>/device/pci_addr
Date: Jan 2019
KernelVersion: 5.1

3
drivers/accel/habanalabs/common/habanalabs.h
View File

@ -3521,6 +3521,9 @@ struct hl_device {
u8 heartbeat;
};
/* Retrieve PCI device name in case of a PCI device or dev name in simulator */
#define HL_DEV_NAME(hdev) \
((hdev)->pdev ? dev_name(&(hdev)->pdev->dev) : "NA-DEVICE")
/**
* struct hl_cs_encaps_sig_handle - encapsulated signals handle structure

9
drivers/accel/habanalabs/common/sysfs.c
View File

@ -410,6 +410,13 @@ static ssize_t module_id_show(struct device *dev,
return sprintf(buf, "%u\n", le32_to_cpu(hdev->asic_prop.cpucp_info.card_location));
}
static ssize_t parent_device_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct hl_device *hdev = dev_get_drvdata(dev);
return sprintf(buf, "%s\n", HL_DEV_NAME(hdev));
}
static DEVICE_ATTR_RO(armcp_kernel_ver);
static DEVICE_ATTR_RO(armcp_ver);
static DEVICE_ATTR_RO(cpld_ver);
@ -430,6 +437,7 @@ 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 DEVICE_ATTR_RO(parent_device);
static struct bin_attribute bin_attr_eeprom = {
.attr = {.name = "eeprom", .mode = (0444)},
@ -456,6 +464,7 @@ static struct attribute *hl_dev_attrs[] = {
&dev_attr_fw_os_ver.attr,
&dev_attr_security_enabled.attr,
&dev_attr_module_id.attr,
&dev_attr_parent_device.attr,
NULL,
};