From: Ciunas Bennett <ciunas.bennett@xxxxxxxxx>
Add the attribute `num_rps` to the `qat` attribute group. This returns
the number of ring pairs that a single device has. This allows to know
the maximum value that can be set to the attribute `rp2svc`.
Signed-off-by: Ciunas Bennett <ciunas.bennett@xxxxxxxxx>
Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@xxxxxxxxx>
Reviewed-by: Damian Muszynski <damian.muszynski@xxxxxxxxx>
Reviewed-by: Tero Kristo <tero.kristo@xxxxxxxxxxxxxxx>
---
Documentation/ABI/testing/sysfs-driver-qat | 14 ++++++++++++++
drivers/crypto/intel/qat/qat_common/adf_sysfs.c | 14 ++++++++++++++
2 files changed, 28 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-driver-qat b/Documentation/ABI/testing/sysfs-driver-qat
index f24a5ddca94b..bbf329cf0d67 100644
--- a/Documentation/ABI/testing/sysfs-driver-qat
+++ b/Documentation/ABI/testing/sysfs-driver-qat
@@ -127,3 +127,17 @@ Description:
sym
This attribute is only available for qat_4xxx devices.
+
+What: /sys/bus/pci/devices/<BDF>/qat/num_rps
+Date: January 2024
+KernelVersion: 6.7
+Contact: qat-linux@xxxxxxxxx
+Description:
+ (RO) Returns the number of ring pairs that a single device has.
+
+ Example usage::
+
+ # cat /sys/bus/pci/devices/<BDF>/qat/num_rps
+ 64
+
+ This attribute is only available for qat_4xxx devices.
diff --git a/drivers/crypto/intel/qat/qat_common/adf_sysfs.c b/drivers/crypto/intel/qat/qat_common/adf_sysfs.c
index 9317127128a9..ddffc98119c6 100644
--- a/drivers/crypto/intel/qat/qat_common/adf_sysfs.c
+++ b/drivers/crypto/intel/qat/qat_common/adf_sysfs.c
@@ -268,11 +268,25 @@ static ssize_t rp2srv_store(struct device *dev, struct device_attribute *attr,
}
static DEVICE_ATTR_RW(rp2srv);
+static ssize_t num_rps_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct adf_accel_dev *accel_dev;
+
+ accel_dev = adf_devmgr_pci_to_accel_dev(to_pci_dev(dev));
+ if (!accel_dev)
+ return -EINVAL;
+
+ return sysfs_emit(buf, "%u\n", GET_MAX_BANKS(accel_dev));
+}
+static DEVICE_ATTR_RO(num_rps);
+
static struct attribute *qat_attrs[] = {
&dev_attr_state.attr,
&dev_attr_cfg_services.attr,
&dev_attr_pm_idle_enabled.attr,
&dev_attr_rp2srv.attr,
+ &dev_attr_num_rps.attr,
NULL,
};
--
2.34.1
