@@ -47,3 +47,38 @@ Description: (RW) Reports the current configuration of the QAT device.
dc
This attribute is only available for qat_4xxx devices.
+
+What: /sys/bus/pci/devices/<BDF>/qat/pm_idle_enabled
+Date: June 2023
+KernelVersion: 6.5
+Contact: qat-linux@intel.com
+Description: (RW) This configuration option provides a way to force the device into remaining in
+ the MAX power state.
+ If idle support is enabled the device will transition to the `MIN` power state when
+ idle, otherwise will stay in the MAX power state.
+ Write to the file to enable or disable idle support.
+
+ The values are:
+
+ * 0: idle support is disabled
+ * 1: idle support is enabled
+
+ Default value is 1.
+
+ It is possible to set the pm_idle_enabled value 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 pm_idle_enabled of
+ a device::
+
+ # cat /sys/bus/pci/devices/<BDF>/qat/state
+ up
+ # cat /sys/bus/pci/devices/<BDF>/qat/pm_idle_enabled
+ 1
+ # echo down > /sys/bus/pci/devices/<BDF>/qat/state
+ # echo 0 > /sys/bus/pci/devices/<BDF>/qat/pm_idle_enabled
+ # echo up > /sys/bus/pci/devices/<BDF>/qat/state
+ # cat /sys/bus/pci/devices/<BDF>/qat/pm_idle_enabled
+ 0
+
+ This attribute is only available for qat_4xxx devices.
@@ -26,6 +26,7 @@
#define ADF_CFG_DC "dc"
#define ADF_CFG_CY "sym;asym"
#define ADF_SERVICES_ENABLED "ServicesEnabled"
+#define ADF_PM_IDLE_SUPPORT "PmIdleSupport"
#define ADF_ETRMGR_COALESCING_ENABLED "InterruptCoalescingEnabled"
#define ADF_ETRMGR_COALESCING_ENABLED_FORMAT \
ADF_ETRMGR_BANK "%d" ADF_ETRMGR_COALESCING_ENABLED
@@ -23,15 +23,25 @@ struct adf_gen4_pm_data {
static int send_host_msg(struct adf_accel_dev *accel_dev)
{
+ char pm_idle_support_cfg[ADF_CFG_MAX_VAL_LEN_IN_BYTES] = {};
void __iomem *pmisc = adf_get_pmisc_base(accel_dev);
+ bool pm_idle_support;
u32 msg;
+ int ret;
msg = ADF_CSR_RD(pmisc, ADF_GEN4_PM_HOST_MSG);
if (msg & ADF_GEN4_PM_MSG_PENDING)
return -EBUSY;
+ adf_cfg_get_param_value(accel_dev, ADF_GENERAL_SEC,
+ ADF_PM_IDLE_SUPPORT, pm_idle_support_cfg);
+ ret = kstrtobool(pm_idle_support_cfg, &pm_idle_support);
+ if (ret)
+ pm_idle_support = true;
+
/* Send HOST_MSG */
- msg = FIELD_PREP(ADF_GEN4_PM_MSG_PAYLOAD_BIT_MASK, PM_SET_MIN);
+ msg = FIELD_PREP(ADF_GEN4_PM_MSG_PAYLOAD_BIT_MASK,
+ pm_idle_support ? PM_SET_MIN : PM_NO_CHANGE);
msg |= ADF_GEN4_PM_MSG_PENDING;
ADF_CSR_WR(pmisc, ADF_GEN4_PM_HOST_MSG, msg);
@@ -37,6 +37,7 @@
#define ADF_GEN4_PM_DEFAULT_IDLE_FILTER (0x0)
#define ADF_GEN4_PM_MAX_IDLE_FILTER (0x7)
+#define ADF_GEN4_PM_DEFAULT_IDLE_SUPPORT (0x1)
int adf_gen4_enable_pm(struct adf_accel_dev *accel_dev);
bool adf_gen4_handle_pm_interrupt(struct adf_accel_dev *accel_dev);
@@ -145,12 +145,65 @@ static ssize_t cfg_services_store(struct device *dev, struct device_attribute *a
return count;
}
+static ssize_t pm_idle_enabled_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ char pm_idle_enabled[ADF_CFG_MAX_VAL_LEN_IN_BYTES] = {};
+ 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_PM_IDLE_SUPPORT, pm_idle_enabled);
+ if (ret)
+ return sysfs_emit(buf, "1\n");
+
+ return sysfs_emit(buf, "%s\n", pm_idle_enabled);
+}
+
+static ssize_t pm_idle_enabled_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned long pm_idle_enabled_cfg_val;
+ struct adf_accel_dev *accel_dev;
+ bool pm_idle_enabled;
+ int ret;
+
+ ret = kstrtobool(buf, &pm_idle_enabled);
+ if (ret)
+ return ret;
+
+ pm_idle_enabled_cfg_val = pm_idle_enabled;
+ 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 set pm_idle_enabled.\n",
+ accel_dev->accel_id);
+ return -EINVAL;
+ }
+
+ ret = adf_cfg_add_key_value_param(accel_dev, ADF_GENERAL_SEC,
+ ADF_PM_IDLE_SUPPORT, &pm_idle_enabled_cfg_val,
+ ADF_DEC);
+ if (ret)
+ return ret;
+
+ return count;
+}
+static DEVICE_ATTR_RW(pm_idle_enabled);
+
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,
+ &dev_attr_pm_idle_enabled.attr,
NULL,
};