idpf: add controlq init and reset checks

At the end of the probe, initialize and schedule the event workqueue.
It calls the hard reset function where reset checks are done to find
if the device is out of the reset. Control queue initialization and
the necessary control queue support is added.

Introduce function pointers for the register operations which are
different between PF and VF devices.

Signed-off-by: Joshua Hay <joshua.a.hay@intel.com>
Co-developed-by: Alan Brady <alan.brady@intel.com>
Signed-off-by: Alan Brady <alan.brady@intel.com>
Co-developed-by: Madhu Chittim <madhu.chittim@intel.com>
Signed-off-by: Madhu Chittim <madhu.chittim@intel.com>
Co-developed-by: Phani Burra <phani.r.burra@intel.com>
Signed-off-by: Phani Burra <phani.r.burra@intel.com>
Co-developed-by: Shailendra Bhatnagar <shailendra.bhatnagar@intel.com>
Signed-off-by: Shailendra Bhatnagar <shailendra.bhatnagar@intel.com>
Reviewed-by: Sridhar Samudrala <sridhar.samudrala@intel.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Co-developed-by: Pavan Kumar Linga <pavan.kumar.linga@intel.com>
Signed-off-by: Pavan Kumar Linga <pavan.kumar.linga@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

Author: jahay1

drivers/net/ethernet/intel/idpf/Makefile

@@ -6,4 +6,10 @@
 obj-$(CONFIG_IDPF) += idpf.o
 
 idpf-y := \
-	idpf_main.o
+	idpf_controlq.o		\
+	idpf_controlq_setup.o	\
+	idpf_dev.o		\
+	idpf_lib.o		\
+	idpf_main.o		\
+	idpf_virtchnl.o 	\
+	idpf_vf_dev.o

drivers/net/ethernet/intel/idpf/idpf.h

@@ -4,25 +4,141 @@
 #ifndef _IDPF_H_
 #define _IDPF_H_
 
+/* Forward declaration */
+struct idpf_adapter;
+
 #include <linux/aer.h>
 #include <linux/etherdevice.h>
 #include <linux/pci.h>
 
 #include "idpf_controlq.h"
 
+/* Default Mailbox settings */
+#define IDPF_NUM_DFLT_MBX_Q		2	/* includes both TX and RX */
+#define IDPF_DFLT_MBX_Q_LEN		64
+#define IDPF_DFLT_MBX_ID		-1
+
 /* available message levels */
 #define IDPF_AVAIL_NETIF_M (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK)
 
+/**
+ * enum idpf_state - State machine to handle bring up
+ * @__IDPF_STARTUP: Start the state machine
+ * @__IDPF_STATE_LAST: Must be last, used to determine size
+ */
+enum idpf_state {
+	__IDPF_STARTUP,
+	__IDPF_STATE_LAST,
+};
+
+/**
+ * enum idpf_flags - Hard reset causes.
+ * @IDPF_HR_FUNC_RESET: Hard reset when TxRx timeout
+ * @IDPF_HR_DRV_LOAD: Set on driver load for a clean HW
+ * @IDPF_HR_RESET_IN_PROG: Reset in progress
+ * @IDPF_REMOVE_IN_PROG: Driver remove in progress
+ * @IDPF_FLAGS_NBITS: Must be last
+ */
+enum idpf_flags {
+	IDPF_HR_FUNC_RESET,
+	IDPF_HR_DRV_LOAD,
+	IDPF_HR_RESET_IN_PROG,
+	IDPF_REMOVE_IN_PROG,
+	IDPF_FLAGS_NBITS,
+};
+
+/**
+ * struct idpf_reset_reg - Reset register offsets/masks
+ * @rstat: Reset status register
+ * @rstat_m: Reset status mask
+ */
+struct idpf_reset_reg {
+	void __iomem *rstat;
+	u32 rstat_m;
+};
+
+/**
+ * struct idpf_reg_ops - Device specific register operation function pointers
+ * @ctlq_reg_init: Mailbox control queue register initialization
+ * @reset_reg_init: Reset register initialization
+ * @trigger_reset: Trigger a reset to occur
+ */
+struct idpf_reg_ops {
+	void (*ctlq_reg_init)(struct idpf_ctlq_create_info *cq);
+	void (*reset_reg_init)(struct idpf_adapter *adapter);
+	void (*trigger_reset)(struct idpf_adapter *adapter,
+			      enum idpf_flags trig_cause);
+};
+
+/**
+ * struct idpf_dev_ops - Device specific operations
+ * @reg_ops: Register operations
+ */
+struct idpf_dev_ops {
+	struct idpf_reg_ops reg_ops;
+};
+
 /**
  * struct idpf_adapter - Device data struct generated on probe
  * @pdev: PCI device struct given on probe
  * @msg_enable: Debug message level enabled
+ * @state: Init state machine
+ * @flags: See enum idpf_flags
+ * @reset_reg: See struct idpf_reset_reg
  * @hw: Device access data
+ * @vc_event_task: Task to handle out of band virtchnl event notifications
+ * @vc_event_wq: Workqueue for virtchnl events
+ * @dev_ops: See idpf_dev_ops
+ * @vport_ctrl_lock: Lock to protect the vport control flow
  */
 struct idpf_adapter {
 	struct pci_dev *pdev;
 	u32 msg_enable;
+	enum idpf_state state;
+	DECLARE_BITMAP(flags, IDPF_FLAGS_NBITS);
+	struct idpf_reset_reg reset_reg;
 	struct idpf_hw hw;
+
+	struct delayed_work vc_event_task;
+	struct workqueue_struct *vc_event_wq;
+
+	struct idpf_dev_ops dev_ops;
+
+	struct mutex vport_ctrl_lock;
 };
 
+/**
+ * idpf_get_reg_addr - Get BAR0 register address
+ * @adapter: private data struct
+ * @reg_offset: register offset value
+ *
+ * Based on the register offset, return the actual BAR0 register address
+ */
+static inline void __iomem *idpf_get_reg_addr(struct idpf_adapter *adapter,
+					      resource_size_t reg_offset)
+{
+	return (void __iomem *)(adapter->hw.hw_addr + reg_offset);
+}
+
+/**
+ * idpf_is_reset_detected - check if we were reset at some point
+ * @adapter: driver specific private structure
+ *
+ * Returns true if we are either in reset currently or were previously reset.
+ */
+static inline bool idpf_is_reset_detected(struct idpf_adapter *adapter)
+{
+	if (!adapter->hw.arq)
+		return true;
+
+	return !(readl(idpf_get_reg_addr(adapter, adapter->hw.arq->reg.len)) &
+		 adapter->hw.arq->reg.len_mask);
+}
+
+void idpf_vc_event_task(struct work_struct *work);
+void idpf_dev_ops_init(struct idpf_adapter *adapter);
+void idpf_vf_dev_ops_init(struct idpf_adapter *adapter);
+int idpf_init_dflt_mbx(struct idpf_adapter *adapter);
+void idpf_deinit_dflt_mbx(struct idpf_adapter *adapter);
+
 #endif /* !_IDPF_H_ */