qcacmn: Add UMAC HW reset event handler

UMAC HW reset is expected to receive the following 3 events from FW.
- DO_PRE_RESET
- DO_POST_RESET_START
- DO_POST_RESET_COMPLETE
Add necessary logic to handle these events.

Change-Id: I786ecf6ed2925fd7fcc0934fdce65c76784f4f67
CRs-Fixed: 3244865

dp/wifi3.0/dp_umac_reset.c

@@ -62,7 +62,7 @@ QDF_STATUS dp_soc_umac_reset_init(struct dp_soc *soc)
 	qdf_mem_zero(umac_reset_ctx, sizeof(*umac_reset_ctx));
 
 	umac_reset_ctx->supported = true;
-	umac_reset_ctx->current_state = UMAC_RESET_STATE_WAIT_FOR_PRE_RESET;
+	umac_reset_ctx->current_state = UMAC_RESET_STATE_WAIT_FOR_DO_PRE_RESET;
 
 	status = dp_get_umac_reset_intr_ctx(soc, &umac_reset_ctx->intr_offset);
 	if (QDF_IS_STATUS_ERROR(status)) {
@@ -70,7 +70,7 @@ QDF_STATUS dp_soc_umac_reset_init(struct dp_soc *soc)
 		return status;
 	}
 
-	alloc_size = sizeof(struct umac_reset_shmem) +
+	alloc_size = sizeof(htt_umac_hang_recovery_msg_shmem_t) +
 			DP_UMAC_RESET_SHMEM_ALIGN - 1;
 	umac_reset_ctx->shmem_vaddr_unaligned =
 	    qdf_mem_alloc_consistent(soc->osdev, soc->osdev->dev,
@@ -91,6 +91,112 @@ QDF_STATUS dp_soc_umac_reset_init(struct dp_soc *soc)
 	return QDF_STATUS_SUCCESS;
 }
 
+/**
+ * dp_umac_reset_get_rx_event() - Extract the Rx event from the shared memory
+ * @umac_reset_ctx: UMAC reset context
+ *
+ * Return: Extracted Rx event in the form of enumeration umac_reset_rx_event
+ */
+static enum umac_reset_rx_event
+dp_umac_reset_get_rx_event_from_shmem(
+	struct dp_soc_umac_reset_ctx *umac_reset_ctx)
+{
+	htt_umac_hang_recovery_msg_shmem_t *shmem_vaddr;
+	uint32_t t2h_msg;
+	uint8_t num_events = 0;
+	enum umac_reset_rx_event rx_event;
+
+	shmem_vaddr = umac_reset_ctx->shmem_vaddr_aligned;
+	if (!shmem_vaddr) {
+		dp_umac_reset_err("Shared memory address is NULL");
+		goto err;
+	}
+
+	if (shmem_vaddr->magic_num != umac_reset_ctx->shmem_exp_magic_num) {
+		dp_umac_reset_err("Shared memory got corrupted");
+		goto err;
+	}
+
+	/* Read the shared memory into a local variable */
+	t2h_msg = shmem_vaddr->t2h_msg;
+
+	/* Clear the shared memory right away */
+	shmem_vaddr->t2h_msg = 0;
+
+	dp_umac_reset_debug("shmem value - t2h_msg: 0x%x", t2h_msg);
+
+	rx_event = UMAC_RESET_RX_EVENT_NONE;
+
+	if (HTT_UMAC_HANG_RECOVERY_MSG_SHMEM_DO_PRE_RESET_GET(t2h_msg)) {
+		rx_event |= UMAC_RESET_RX_EVENT_DO_PRE_RESET;
+		num_events++;
+	}
+
+	if (HTT_UMAC_HANG_RECOVERY_MSG_SHMEM_DO_POST_RESET_START_GET(t2h_msg)) {
+		rx_event |= UMAC_RESET_RX_EVENT_DO_POST_RESET_START;
+		num_events++;
+	}
+
+	if (HTT_UMAC_HANG_RECOVERY_MSG_SHMEM_DO_POST_RESET_COMPLETE_GET(t2h_msg)) {
+		rx_event |= UMAC_RESET_RX_EVENT_DO_POST_RESET_COMPELTE;
+		num_events++;
+	}
+
+	dp_umac_reset_debug("deduced rx event: 0x%x", rx_event);
+	/* There should not be more than 1 event */
+	if (num_events > 1) {
+		dp_umac_reset_err("Multiple events(0x%x) got posted", rx_event);
+		goto err;
+	}
+
+	return rx_event;
+err:
+	qdf_assert_always(0);
+	return UMAC_RESET_RX_EVENT_ERROR;
+}
+
+/**
+ * dp_umac_reset_get_rx_event() - Extract the Rx event
+ * @umac_reset_ctx: UMAC reset context
+ *
+ * Return: Extracted Rx event in the form of enumeration umac_reset_rx_event
+ */
+static inline enum umac_reset_rx_event
+dp_umac_reset_get_rx_event(struct dp_soc_umac_reset_ctx *umac_reset_ctx)
+{
+	return dp_umac_reset_get_rx_event_from_shmem(umac_reset_ctx);
+}
+
+/**
+ * dp_umac_reset_validate_n_update_state_machine_on_rx() - Validate the state
+ * machine for a given rx event and update the state machine
+ * @umac_reset_ctx: UMAC reset context
+ * @rx_event: Rx event
+ * @current_exp_state: Expected state
+ * @next_state: The state to which the state machine needs to be updated
+ *
+ * Return: QDF_STATUS of operation
+ */
+static QDF_STATUS
+dp_umac_reset_validate_n_update_state_machine_on_rx(
+	struct dp_soc_umac_reset_ctx *umac_reset_ctx,
+	enum umac_reset_rx_event rx_event,
+	enum umac_reset_state current_exp_state,
+	enum umac_reset_state next_state)
+{
+	if (umac_reset_ctx->current_state != current_exp_state) {
+		dp_umac_reset_err("state machine validation failed on rx event: %d, current state is %d",
+				  rx_event,
+				  umac_reset_ctx->current_state);
+		qdf_assert_always(0);
+		return QDF_STATUS_E_FAILURE;
+	}
+
+	/* Update the state */
+	umac_reset_ctx->current_state = next_state;
+	return QDF_STATUS_SUCCESS;
+}
+
 /**
  * dp_umac_reset_rx_event_handler() - Main Rx event handler for UMAC reset
  * @dp_ctx: Interrupt context corresponding to UMAC reset
@@ -99,8 +205,78 @@ QDF_STATUS dp_soc_umac_reset_init(struct dp_soc *soc)
  */
 static int dp_umac_reset_rx_event_handler(void *dp_ctx)
 {
-	/* Note: This will be implemented in an upcoming change */
-	return 0;
+	struct dp_intr *int_ctx = (struct dp_intr *)dp_ctx;
+	struct dp_soc *soc = int_ctx->soc;
+	struct dp_soc_umac_reset_ctx *umac_reset_ctx;
+	enum umac_reset_rx_event rx_event;
+	QDF_STATUS status = QDF_STATUS_E_INVAL;
+	enum umac_reset_action action;
+
+	if (!soc) {
+		dp_umac_reset_err("DP SOC is null");
+		goto exit;
+	}
+
+	umac_reset_ctx = &soc->umac_reset_ctx;
+
+	dp_umac_reset_debug("enter");
+	rx_event = dp_umac_reset_get_rx_event(umac_reset_ctx);
+
+	switch (rx_event) {
+	case UMAC_RESET_RX_EVENT_NONE:
+		/* This interrupt is not meant for us, so exit */
+		dp_umac_reset_debug("Not a UMAC reset event");
+		status = QDF_STATUS_SUCCESS;
+		goto exit;
+
+	case UMAC_RESET_RX_EVENT_DO_PRE_RESET:
+		status = dp_umac_reset_validate_n_update_state_machine_on_rx(
+			umac_reset_ctx, rx_event,
+			UMAC_RESET_STATE_WAIT_FOR_DO_PRE_RESET,
+			UMAC_RESET_STATE_DO_PRE_RESET_RECEIVED);
+
+		action = UMAC_RESET_ACTION_DO_PRE_RESET;
+		break;
+
+	case UMAC_RESET_RX_EVENT_DO_POST_RESET_START:
+		status = dp_umac_reset_validate_n_update_state_machine_on_rx(
+			umac_reset_ctx, rx_event,
+			UMAC_RESET_STATE_WAIT_FOR_DO_POST_RESET_START,
+			UMAC_RESET_STATE_DO_POST_RESET_START_RECEIVED);
+
+		action = UMAC_RESET_ACTION_DO_POST_RESET_START;
+		break;
+
+	case UMAC_RESET_RX_EVENT_DO_POST_RESET_COMPELTE:
+		status = dp_umac_reset_validate_n_update_state_machine_on_rx(
+			umac_reset_ctx, rx_event,
+			UMAC_RESET_STATE_WAIT_FOR_DO_POST_RESET_COMPLETE,
+			UMAC_RESET_STATE_DO_POST_RESET_COMPLETE_RECEIVED);
+
+		action = UMAC_RESET_ACTION_DO_POST_RESET_COMPLETE;
+		break;
+
+	case UMAC_RESET_RX_EVENT_ERROR:
+		dp_umac_reset_err("Error Rx event");
+		goto exit;
+
+	default:
+		dp_umac_reset_err("Invalid value(%u) for Rx event", rx_event);
+		goto exit;
+	}
+
+	/* Call the handler for this event */
+	if (QDF_IS_STATUS_SUCCESS(status)) {
+		if (!umac_reset_ctx->rx_actions.cb[action]) {
+			dp_umac_reset_err("rx callback is NULL");
+			goto exit;
+		}
+
+		status = umac_reset_ctx->rx_actions.cb[action](soc);
+	}
+
+exit:
+	return qdf_status_to_os_return(status);
 }
 
 QDF_STATUS dp_umac_reset_interrupt_attach(struct dp_soc *soc)
@@ -175,3 +351,27 @@ QDF_STATUS dp_umac_reset_interrupt_detach(struct dp_soc *soc)
 
 	return hif_unregister_umac_reset_handler(soc->hif_handle);
 }
+
+QDF_STATUS dp_umac_reset_register_rx_action_callback(
+			struct dp_soc *soc,
+			QDF_STATUS (*handler)(struct dp_soc *soc),
+			enum umac_reset_action action)
+{
+	struct dp_soc_umac_reset_ctx *umac_reset_ctx;
+
+	if (!soc) {
+		dp_umac_reset_err("DP SOC is null");
+		return QDF_STATUS_E_NULL_VALUE;
+	}
+
+	if (action >= UMAC_RESET_ACTION_MAX) {
+		dp_umac_reset_err("invalid action: %d", action);
+		return QDF_STATUS_E_INVAL;
+	}
+
+	umac_reset_ctx = &soc->umac_reset_ctx;
+
+	umac_reset_ctx->rx_actions.cb[action] = handler;
+
+	return QDF_STATUS_SUCCESS;
+}

dp/wifi3.0/dp_umac_reset.h

@@ -20,6 +20,20 @@
 #include <qdf_types.h>
 struct dp_soc;
 
+/**
+ * enum umac_reset_action - Actions supported by the UMAC reset
+ * @UMAC_RESET_ACTION_DO_PRE_RESET: DO_PRE_RESET
+ * @UMAC_RESET_ACTION_DO_POST_RESET_START: DO_POST_RESET_START
+ * @UMAC_RESET_ACTION_DO_POST_RESET_COMPLETE: DO_POST_RESET_COMPLETE
+ * @UMAC_RESET_ACTION_MAX: Maximum actions
+ */
+enum umac_reset_action {
+	UMAC_RESET_ACTION_DO_PRE_RESET = 0,
+	UMAC_RESET_ACTION_DO_POST_RESET_START = 1,
+	UMAC_RESET_ACTION_DO_POST_RESET_COMPLETE = 2,
+	UMAC_RESET_ACTION_MAX
+};
+
 #ifdef DP_UMAC_HW_RESET_SUPPORT
 #define dp_umac_reset_alert(params...) \
 	QDF_TRACE_FATAL(QDF_MODULE_ID_DP_UMAC_RESET, params)
@@ -36,33 +50,62 @@ struct dp_soc;
 
 #define DP_UMAC_RESET_SHMEM_ALIGN 8
 /**
- * enum umac_reset_state - States required for UMAC reset state machine
- * @UMAC_RESET_STATE_WAIT_FOR_PRE_RESET: Waiting for the PRE_RESET event
- * @UMAC_RESET_STATE_PRE_RESET_RECEIVED: Received the PRE_RESET event
- * @UMAC_RESET_STATE_HOST_PRE_RESET_COMPLETED: Host has completed handling the
+ * enum umac_reset_state - States required by the UMAC reset state machine
+ * @UMAC_RESET_STATE_WAIT_FOR_DO_PRE_RESET: Waiting for the DO_PRE_RESET event
+ * @UMAC_RESET_STATE_DO_PRE_RESET_RECEIVED: Received the DO_PRE_RESET event
+ * @UMAC_RESET_STATE_HOST_PRE_RESET_DONE: Host has completed handling the
  * PRE_RESET event
- * @UMAC_RESET_STATE_WAIT_FOR_POST_RESET: Waiting for the POST_RESET event
- * @UMAC_RESET_STATE_POST_RESET_RECEIVED: Received the POST_RESET event
- * @UMAC_RESET_STATE_HOST_POST_RESET_COMPLETED: Host has completed handling the
- * POST_RESET event
+ * @UMAC_RESET_STATE_WAIT_FOR_DO_POST_RESET_START: Waiting for the
+ * DO_POST_RESET_START event
+ * @UMAC_RESET_STATE_DO_POST_RESET_START_RECEIVED: Received the
+ * DO_POST_RESET_START event
+ * @UMAC_RESET_STATE_HOST_POST_RESET_START_DONE: Host has completed handling the
+ * POST_RESET_START event
+ * @UMAC_RESET_STATE_WAIT_FOR_DO_POST_RESET_COMPLETE: Waiting for the
+ * DO_POST_RESET_COMPLETE event
+ * @UMAC_RESET_STATE_DO_POST_RESET_COMPLETE_RECEIVED: Received the
+ * DO_POST_RESET_COMPLETE event
+ * @UMAC_RESET_STATE_HOST_POST_RESET_COMPLETE_DONE: Host has completed handling
+ * the DO_POST_RESET_COMPLETE event
  */
 enum umac_reset_state {
-	UMAC_RESET_STATE_WAIT_FOR_PRE_RESET = 0,
-	UMAC_RESET_STATE_PRE_RESET_RECEIVED,
-	UMAC_RESET_STATE_HOST_PRE_RESET_COMPLETED,
-	UMAC_RESET_STATE_WAIT_FOR_POST_RESET,
-	UMAC_RESET_STATE_POST_RESET_RECEIVED,
-	UMAC_RESET_STATE_HOST_POST_RESET_COMPLETED,
+	UMAC_RESET_STATE_WAIT_FOR_DO_PRE_RESET = 0,
+	UMAC_RESET_STATE_DO_PRE_RESET_RECEIVED,
+	UMAC_RESET_STATE_HOST_PRE_RESET_DONE,
+
+	UMAC_RESET_STATE_WAIT_FOR_DO_POST_RESET_START,
+	UMAC_RESET_STATE_DO_POST_RESET_START_RECEIVED,
+	UMAC_RESET_STATE_HOST_POST_RESET_START_DONE,
+
+	UMAC_RESET_STATE_WAIT_FOR_DO_POST_RESET_COMPLETE,
+	UMAC_RESET_STATE_DO_POST_RESET_COMPLETE_RECEIVED,
+	UMAC_RESET_STATE_HOST_POST_RESET_COMPLETE_DONE,
+};
+
+/**
+ * enum umac_reset_rx_event - Rx events deduced by the UMAC reset
+ * @UMAC_RESET_RX_EVENT_NONE: No event
+ * @UMAC_RESET_RX_EVENT_DO_PRE_RESET: DO_PRE_RESET event
+ * @UMAC_RESET_RX_EVENT_DO_POST_RESET_START: DO_POST_RESET_START event
+ * @UMAC_RESET_RX_EVENT_DO_POST_RESET_COMPELTE: DO_POST_RESET_COMPELTE event
+ * @UMAC_RESET_RX_EVENT_ERROR: Error while processing the Rx event
+ */
+enum umac_reset_rx_event {
+	UMAC_RESET_RX_EVENT_NONE = 0x0,
+	UMAC_RESET_RX_EVENT_DO_PRE_RESET = 0x1,
+	UMAC_RESET_RX_EVENT_DO_POST_RESET_START = 0x2,
+	UMAC_RESET_RX_EVENT_DO_POST_RESET_COMPELTE = 0x4,
+
+	UMAC_RESET_RX_EVENT_ERROR = 0xFFFFFFFF,
 };
 
 /**
- * struct umac_reset_shmem - Shared memory layout for UMAC reset feature
- * @t2h_indication: target to host communicaton
- * @h2t_indication: host to target communicaton
+ * struct umac_reset_rx_actions - callbacks for handling UMAC reset actions
+ * @cb: Array of pointers where each pointer contains callback for each UMAC
+ * reset action for that index
  */
-struct umac_reset_shmem {
-	uint32_t t2h_indication;
-	uint32_t h2t_indication;
+struct umac_reset_rx_actions {
+	QDF_STATUS (*cb[UMAC_RESET_ACTION_MAX])(struct dp_soc *soc);
 };
 
 /**
@@ -74,15 +117,19 @@ struct umac_reset_shmem {
  * @intr_offset: Offset of the UMAC reset interrupt w.r.t DP base interrupt
  * @current_state: current state of the UMAC reset state machine
  * @supported: Whether UMAC reset is supported on this soc
+ * @shmem_exp_magic_num: Expected magic number in the shared memory
+ * @rx_actions: callbacks for handling UMAC reset actions
  */
 struct dp_soc_umac_reset_ctx {
 	qdf_dma_addr_t shmem_paddr_unaligned;
-	struct umac_reset_shmem *shmem_vaddr_unaligned;
+	void *shmem_vaddr_unaligned;
 	qdf_dma_addr_t shmem_paddr_aligned;
-	struct umac_reset_shmem *shmem_vaddr_aligned;
+	htt_umac_hang_recovery_msg_shmem_t *shmem_vaddr_aligned;
 	int intr_offset;
 	enum umac_reset_state current_state;
 	bool supported;
+	uint32_t shmem_exp_magic_num;
+	struct umac_reset_rx_actions rx_actions;
 };
 
 /**
@@ -108,11 +155,34 @@ QDF_STATUS dp_umac_reset_interrupt_attach(struct dp_soc *soc);
  * Return: QDF status of operation
  */
 QDF_STATUS dp_umac_reset_interrupt_detach(struct dp_soc *soc);
+
+/**
+ * dp_umac_reset_register_rx_action_callback() - Register a callback for a given
+ * UMAC reset action
+ * @soc: DP soc object
+ * @handler: callback handler to be registered
+ * @action: UMAC reset action for which @handler needs to be registered
+ *
+ * Return: QDF status of operation
+ */
+QDF_STATUS dp_umac_reset_register_rx_action_callback(
+			struct dp_soc *soc,
+			QDF_STATUS (*handler)(struct dp_soc *soc),
+			enum umac_reset_action action);
 #else
 static inline
 QDF_STATUS dp_soc_umac_reset_init(struct dp_soc *soc)
 {
 	return QDF_STATUS_SUCCESS;
 }
+
+static inline
+QDF_STATUS dp_umac_reset_register_rx_action_callback(
+			struct dp_soc *soc,
+			QDF_STATUS (*handler)(struct dp_soc *soc),
+			enum umac_reset_action action)
+{
+	return QDF_STATUS_SUCCESS;
+}
 #endif /* DP_UMAC_HW_RESET_SUPPORT */
 #endif /* _DP_UMAC_RESET_H_ */