crypto: qat - expose device config through sysfs for 4xxx

qat_4xxx devices can be configured to allow either crypto or compression
operations. At the moment, devices are configured statically according to
the following rule:
- odd numbered devices assigned to compression services
- even numbered devices assigned to crypto services

Expose the sysfs attribute /sys/bus/pci/devices/<BDF>/qat/cfg_services
to allow to detect the configuration of a device and to change it.

The `cfg_service` attribute is only exposed for qat_4xxx devices and it
is limited to two configurations: (1) "sym;asym" for crypto services and
"dc" for compression services.

Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Co-developed-by: Tomasz Kowallik <tomaszx.kowalik@intel.com>
Signed-off-by: Tomasz Kowallik <tomaszx.kowalik@intel.com>
Reviewed-by: Adam Guerin <adam.guerin@intel.com>
Reviewed-by: Fiona Trahe <fiona.trahe@intel.com>
Reviewed-by: Wojciech Ziemba <wojciech.ziemba@intel.com>
Reviewed-by: Vladis Dronov <vdronov@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/Documentation/ABI/testing/sysfs-driver-qat b/Documentation/ABI/testing/sysfs-driver-qat
index 769b09c..a600531 100644 (file)
--- a/Documentation/ABI/testing/sysfs-driver-qat
+++ b/Documentation/ABI/testing/sysfs-driver-qat
@@ -19,3 +19,42 @@ Description: Reports the current state of the QAT device and allows to
                if the device is up and vice versa.
 
                This attribute is only available for qat_4xxx devices.
+
+What:          /sys/bus/pci/devices/<BDF>/qat/cfg_services
+Date:          June 2022
+KernelVersion: 5.20
+Contact:       qat-linux@intel.com
+Description:   Reports the current configuration of the QAT device and allows
+               to change it.
+
+               This attribute is RW.
+
+               Returned values:
+                       sym;asym:       the device is configured for running
+                                       crypto services
+                       dc:             the device is configured for running
+                                       compression services
+
+               Allowed values:
+                       sym;asym:       configure the device for running
+                                       crypto services
+                       dc:             configure the device for running
+                                       compression services
+
+               It is possible to set the configuration only if the device
+               is in the `down` state (see /sys/bus/pci/devices/<BDF>/qat/state)
+
+               The following example shows how to change the configuration of
+               a device configured for running crypto services in order to
+               run data compression:
+                       # cat /sys/bus/pci/devices/<BDF>/qat/state
+                       up
+                       # cat /sys/bus/pci/devices/<BDF>/qat/cfg_services
+                       sym;asym
+                       # echo down > /sys/bus/pci/devices/<BDF>/qat/state
+                       # echo dc > /sys/bus/pci/devices/<BDF>/qat/cfg_services
+                       # echo up > /sys/bus/pci/devices/<BDF>/qat/state
+                       # cat /sys/bus/pci/devices/<BDF>/qat/cfg_services
+                       dc
+
+               This attribute is only available for qat_4xxx devices.

diff --git a/drivers/crypto/qat/qat_common/adf_sysfs.c b/drivers/crypto/qat/qat_common/adf_sysfs.c
index 8f47a56..e8b078e 100644 (file)
--- a/drivers/crypto/qat/qat_common/adf_sysfs.c
+++ b/drivers/crypto/qat/qat_common/adf_sysfs.c
@@ -58,8 +58,9 @@ static ssize_t state_store(struct device *dev, struct device_attribute *attr,
 
                dev_info(dev, "Stopping device qat_dev%d\n", accel_id);
 
-               adf_dev_stop(accel_dev);
-               adf_dev_shutdown(accel_dev);
+               ret = adf_dev_shutdown_cache_cfg(accel_dev);
+               if (ret < 0)
+                       return -EINVAL;
 
                break;
        case DEV_UP:
@@ -80,8 +81,7 @@ static ssize_t state_store(struct device *dev, struct device_attribute *attr,
                if (ret < 0) {
                        dev_err(dev, "Failed to start device qat_dev%d\n",
                                accel_id);
-                       adf_dev_stop(accel_dev);
-                       adf_dev_shutdown(accel_dev);
+                       adf_dev_shutdown_cache_cfg(accel_dev);
                        return ret;
                }
                break;
@@ -92,10 +92,82 @@ static ssize_t state_store(struct device *dev, struct device_attribute *attr,
        return count;
 }
 
+static const char * const services_operations[] = {
+       ADF_CFG_CY,
+       ADF_CFG_DC,
+};
+
+static ssize_t cfg_services_show(struct device *dev, struct device_attribute *attr,
+                                char *buf)
+{
+       char services[ADF_CFG_MAX_VAL_LEN_IN_BYTES] = {0};
+       struct adf_accel_dev *accel_dev;
+       int ret;
+
+       accel_dev = adf_devmgr_pci_to_accel_dev(to_pci_dev(dev));
+       if (!accel_dev)
+               return -EINVAL;
+
+       ret = adf_cfg_get_param_value(accel_dev, ADF_GENERAL_SEC,
+                                     ADF_SERVICES_ENABLED, services);
+       if (ret)
+               return ret;
+
+       return sysfs_emit(buf, "%s\n", services);
+}
+
+static int adf_sysfs_update_dev_config(struct adf_accel_dev *accel_dev,
+                                      const char *services)
+{
+       return adf_cfg_add_key_value_param(accel_dev, ADF_GENERAL_SEC,
+                                          ADF_SERVICES_ENABLED, services,
+                                          ADF_STR);
+}
+
+static ssize_t cfg_services_store(struct device *dev, struct device_attribute *attr,
+                                 const char *buf, size_t count)
+{
+       struct adf_hw_device_data *hw_data;
+       struct adf_accel_dev *accel_dev;
+       int ret;
+
+       ret = sysfs_match_string(services_operations, buf);
+       if (ret < 0)
+               return ret;
+
+       accel_dev = adf_devmgr_pci_to_accel_dev(to_pci_dev(dev));
+       if (!accel_dev)
+               return -EINVAL;
+
+       if (adf_dev_started(accel_dev)) {
+               dev_info(dev, "Device qat_dev%d must be down to reconfigure the service.\n",
+                        accel_dev->accel_id);
+               return -EINVAL;
+       }
+
+       ret = adf_sysfs_update_dev_config(accel_dev, services_operations[ret]);
+       if (ret < 0)
+               return ret;
+
+       hw_data = GET_HW_DATA(accel_dev);
+
+       /* Update capabilities mask after change in configuration.
+        * A call to this function is required as capabilities are, at the
+        * moment, tied to configuration
+        */
+       hw_data->accel_capabilities_mask = hw_data->get_accel_cap(accel_dev);
+       if (!hw_data->accel_capabilities_mask)
+               return -EINVAL;
+
+       return count;
+}
+
 static DEVICE_ATTR_RW(state);
+static DEVICE_ATTR_RW(cfg_services);
 
 static struct attribute *qat_attrs[] = {
        &dev_attr_state.attr,
+       &dev_attr_cfg_services.attr,
        NULL,
 };