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From:   Damian Muszynski <damian.muszynski@intel.com>
To:     <herbert@gondor.apana.org.au>
CC:     <linux-crypto@vger.kernel.org>, <qat-linux@intel.com>,
        Ciunas Bennett <ciunas.bennett@intel.com>,
        Giovanni Cabiddu <giovanni.cabiddu@intel.com>,
        Damian Muszynski <damian.muszynski@intel.com>,
        Tero Kristo <tero.kristo@linux.intel.com>
Subject: [PATCH v2 11/11] crypto: qat - add num_rps sysfs attribute
Date:   Fri, 20 Oct 2023 15:49:31 +0200
Message-ID: <20231020134931.7530-12-damian.muszynski@intel.com>
In-Reply-To: <20231020134931.7530-1-damian.muszynski@intel.com>
References: <20231020134931.7530-1-damian.muszynski@intel.com>
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From: Ciunas Bennett <ciunas.bennett@intel.com>

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@intel.com>
Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Reviewed-by: Damian Muszynski <damian.muszynski@intel.com>
Reviewed-by: Tero Kristo <tero.kristo@linux.intel.com>
---
 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@intel.com
+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