crypto: qat - expose pm_idle_enabled through sysfs

diff --git a/Documentation/ABI/testing/sysfs-driver-qat b/Documentation/ABI/testing/sysfs-driver-qat
index 087842b1969e..ed4b7b2d1b6c 100644
--- a/Documentation/ABI/testing/sysfs-driver-qat
+++ b/Documentation/ABI/testing/sysfs-driver-qat
@@ -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.
diff --git a/drivers/crypto/intel/qat/qat_common/adf_cfg_strings.h b/drivers/crypto/intel/qat/qat_common/adf_cfg_strings.h
index 5d8c3bdb258c..96d0db41f1e2 100644
--- a/drivers/crypto/intel/qat/qat_common/adf_cfg_strings.h
+++ b/drivers/crypto/intel/qat/qat_common/adf_cfg_strings.h
@@ -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
diff --git a/drivers/crypto/intel/qat/qat_common/adf_gen4_pm.c b/drivers/crypto/intel/qat/qat_common/adf_gen4_pm.c
index 7037c0892a8a..34c6cd8e27c0 100644
--- a/drivers/crypto/intel/qat/qat_common/adf_gen4_pm.c
+++ b/drivers/crypto/intel/qat/qat_common/adf_gen4_pm.c
@@ -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);
 
diff --git a/drivers/crypto/intel/qat/qat_common/adf_gen4_pm.h b/drivers/crypto/intel/qat/qat_common/adf_gen4_pm.h
index f8f8a9ee29e5..dd112923e006 100644
--- a/drivers/crypto/intel/qat/qat_common/adf_gen4_pm.h
+++ b/drivers/crypto/intel/qat/qat_common/adf_gen4_pm.h
@@ -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);
diff --git a/drivers/crypto/intel/qat/qat_common/adf_sysfs.c b/drivers/crypto/intel/qat/qat_common/adf_sysfs.c
index 3eb6611ab1b1..9515da11deb7 100644
--- a/drivers/crypto/intel/qat/qat_common/adf_sysfs.c
+++ b/drivers/crypto/intel/qat/qat_common/adf_sysfs.c
@@ -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,
 };