drivers/crypto/intel/qat/qat_common/adf_gen4_pm.c

Source file repositories/reference/linux-study-clean/drivers/crypto/intel/qat/qat_common/adf_gen4_pm.c

File Facts

System
Linux kernel
Corpus path
drivers/crypto/intel/qat/qat_common/adf_gen4_pm.c
Extension
.c
Size
4382 bytes
Lines
165
Domain
Driver Families
Bucket
drivers/crypto
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct adf_gen4_pm_data {
	struct work_struct pm_irq_work;
	struct adf_accel_dev *accel_dev;
	u32 pm_int_sts;
};

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);
	struct adf_pm *pm = &accel_dev->power_management;
	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;

	if (pm_idle_support)
		pm->host_ack_counter++;
	else
		pm->host_nack_counter++;

	/* Send HOST_MSG */
	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);

	/* Poll status register to make sure the HOST_MSG has been processed */
	return read_poll_timeout(ADF_CSR_RD, msg,
				!(msg & ADF_GEN4_PM_MSG_PENDING),
				ADF_GEN4_PM_MSG_POLL_DELAY_US,
				ADF_GEN4_PM_POLL_TIMEOUT_US, true, pmisc,
				ADF_GEN4_PM_HOST_MSG);
}

static void pm_bh_handler(struct work_struct *work)
{
	struct adf_gen4_pm_data *pm_data =
		container_of(work, struct adf_gen4_pm_data, pm_irq_work);
	struct adf_accel_dev *accel_dev = pm_data->accel_dev;
	void __iomem *pmisc = adf_get_pmisc_base(accel_dev);
	struct adf_pm *pm = &accel_dev->power_management;
	u32 pm_int_sts = pm_data->pm_int_sts;
	u32 val;

	/* PM Idle interrupt */
	if (pm_int_sts & ADF_GEN4_PM_IDLE_STS) {
		pm->idle_irq_counters++;
		/* Issue host message to FW */
		if (send_host_msg(accel_dev))
			dev_warn_ratelimited(&GET_DEV(accel_dev),
					     "Failed to send host msg to FW\n");
	}

	/* PM throttle interrupt */
	if (pm_int_sts & ADF_GEN4_PM_THR_STS)
		pm->throttle_irq_counters++;

	/* PM fw interrupt */
	if (pm_int_sts & ADF_GEN4_PM_FW_INT_STS)
		pm->fw_irq_counters++;

	/* Clear interrupt status */
	ADF_CSR_WR(pmisc, ADF_GEN4_PM_INTERRUPT, pm_int_sts);

	/* Reenable PM interrupt */
	val = ADF_CSR_RD(pmisc, ADF_GEN4_ERRMSK2);
	val &= ~ADF_GEN4_PM_SOU;
	ADF_CSR_WR(pmisc, ADF_GEN4_ERRMSK2, val);

	kfree(pm_data);
}

bool adf_gen4_handle_pm_interrupt(struct adf_accel_dev *accel_dev)
{
	void __iomem *pmisc = adf_get_pmisc_base(accel_dev);
	struct adf_gen4_pm_data *pm_data = NULL;
	u32 errsou2;
	u32 errmsk2;
	u32 val;

Annotation

Implementation Notes