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/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2015-2018, The Linux Foundation. All rights reserved.
* Copyright (C) 2018-2020 Linaro Ltd.
*/
#ifndef _GSI_PRIVATE_H_
#define _GSI_PRIVATE_H_
/* === Only "gsi.c" and "gsi_trans.c" should include this file === */
#include <linux/types.h>
struct gsi_trans;
struct gsi_ring;
struct gsi_channel;
#define GSI_RING_ELEMENT_SIZE 16 /* bytes; must be a power of 2 */
/**
* list_last_entry_or_null - get the last element from a list
* @ptr: the list head to take the element from.
* @type: the type of the struct this is embedded in.
* @member: the name of the list_head within the struct.
*
* Note that if the list is empty, it returns NULL.
*/
#define list_last_entry_or_null(ptr, type, member) ({ \
struct list_head *head__ = (ptr); \
struct list_head *pos__ = READ_ONCE(head__->prev); \
pos__ != head__ ? list_entry(pos__, type, member) : NULL; \
})
/**
* gsi_trans_move_complete() - Mark a GSI transaction completed
* @trans: Transaction to commit
*/
void gsi_trans_move_complete(struct gsi_trans *trans);
/**
* gsi_trans_move_polled() - Mark a transaction polled
* @trans: Transaction to update
*/
void gsi_trans_move_polled(struct gsi_trans *trans);
/**
* gsi_trans_complete() - Complete a GSI transaction
* @trans: Transaction to complete
*
* Marks a transaction complete (including freeing it).
*/
void gsi_trans_complete(struct gsi_trans *trans);
/**
* gsi_channel_trans_mapped() - Return a transaction mapped to a TRE index
* @channel: Channel associated with the transaction
* @index: Index of the TRE having a transaction
*
* Return: The GSI transaction pointer associated with the TRE index
*/
struct gsi_trans *gsi_channel_trans_mapped(struct gsi_channel *channel,
u32 index);
/**
* gsi_channel_trans_complete() - Return a channel's next completed transaction
* @channel: Channel whose next transaction is to be returned
*
* Return: The next completed transaction, or NULL if nothing new
*/
struct gsi_trans *gsi_channel_trans_complete(struct gsi_channel *channel);
/**
* gsi_channel_trans_cancel_pending() - Cancel pending transactions
* @channel: Channel whose pending transactions should be cancelled
*
* Cancel all pending transactions on a channel. These are transactions
* that have been committed but not yet completed. This is required when
* the channel gets reset. At that time all pending transactions will be
* marked as cancelled.
*
* NOTE: Transactions already complete at the time of this call are
* unaffected.
*/
void gsi_channel_trans_cancel_pending(struct gsi_channel *channel);
/**
* gsi_channel_trans_init() - Initialize a channel's GSI transaction info
* @gsi: GSI pointer
* @channel_id: Channel number
*
* Return: 0 if successful, or -ENOMEM on allocation failure
*
* Creates and sets up information for managing transactions on a channel
*/
int gsi_channel_trans_init(struct gsi *gsi, u32 channel_id);
/**
* gsi_channel_trans_exit() - Inverse of gsi_channel_trans_init()
* @channel: Channel whose transaction information is to be cleaned up
*/
void gsi_channel_trans_exit(struct gsi_channel *channel);
/**
* gsi_channel_doorbell() - Ring a channel's doorbell
* @channel: Channel whose doorbell should be rung
*
* Rings a channel's doorbell to inform the GSI hardware that new
* transactions (TREs, really) are available for it to process.
*/
void gsi_channel_doorbell(struct gsi_channel *channel);
/**
* gsi_ring_virt() - Return virtual address for a ring entry
* @ring: Ring whose address is to be translated
* @index: Index (slot number) of entry
*/
void *gsi_ring_virt(struct gsi_ring *ring, u32 index);
/**
* gsi_trans_tx_committed() - Record bytes committed for transmit
* @trans: TX endpoint transaction being committed
*
* Report that a TX transaction has been committed. It updates some
* statistics used to manage transmit rates.
*/
void gsi_trans_tx_committed(struct gsi_trans *trans);
/**
* gsi_trans_tx_queued() - Report a queued TX channel transaction
* @trans: Transaction being passed to hardware
*
* Report to the network stack that a TX transaction is being supplied
* to the hardware.
*/
void gsi_trans_tx_queued(struct gsi_trans *trans);
#endif /* _GSI_PRIVATE_H_ */
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