119 lines
3.7 KiB
C
119 lines
3.7 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (c) 2015-2018, The Linux Foundation. All rights reserved.
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* Copyright (C) 2018-2020 Linaro Ltd.
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*/
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#ifndef _GSI_PRIVATE_H_
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#define _GSI_PRIVATE_H_
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/* === Only "gsi.c" and "gsi_trans.c" should include this file === */
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#include <linux/types.h>
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struct gsi_trans;
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struct gsi_ring;
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struct gsi_channel;
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#define GSI_RING_ELEMENT_SIZE 16 /* bytes; must be a power of 2 */
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/* Return the entry that follows one provided in a transaction pool */
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void *gsi_trans_pool_next(struct gsi_trans_pool *pool, void *element);
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/**
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* gsi_trans_move_complete() - Mark a GSI transaction completed
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* @trans: Transaction to commit
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*/
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void gsi_trans_move_complete(struct gsi_trans *trans);
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/**
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* gsi_trans_move_polled() - Mark a transaction polled
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* @trans: Transaction to update
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*/
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void gsi_trans_move_polled(struct gsi_trans *trans);
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/**
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* gsi_trans_complete() - Complete a GSI transaction
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* @trans: Transaction to complete
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*
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* Marks a transaction complete (including freeing it).
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*/
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void gsi_trans_complete(struct gsi_trans *trans);
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/**
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* gsi_channel_trans_mapped() - Return a transaction mapped to a TRE index
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* @channel: Channel associated with the transaction
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* @index: Index of the TRE having a transaction
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*
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* Return: The GSI transaction pointer associated with the TRE index
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*/
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struct gsi_trans *gsi_channel_trans_mapped(struct gsi_channel *channel,
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u32 index);
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/**
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* gsi_channel_trans_complete() - Return a channel's next completed transaction
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* @channel: Channel whose next transaction is to be returned
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*
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* Return: The next completed transaction, or NULL if nothing new
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*/
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struct gsi_trans *gsi_channel_trans_complete(struct gsi_channel *channel);
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/**
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* gsi_channel_trans_cancel_pending() - Cancel pending transactions
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* @channel: Channel whose pending transactions should be cancelled
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*
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* Cancel all pending transactions on a channel. These are transactions
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* that have been committed but not yet completed. This is required when
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* the channel gets reset. At that time all pending transactions will be
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* marked as cancelled.
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*
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* NOTE: Transactions already complete at the time of this call are
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* unaffected.
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*/
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void gsi_channel_trans_cancel_pending(struct gsi_channel *channel);
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/**
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* gsi_channel_trans_init() - Initialize a channel's GSI transaction info
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* @gsi: GSI pointer
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* @channel_id: Channel number
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*
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* Return: 0 if successful, or -ENOMEM on allocation failure
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*
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* Creates and sets up information for managing transactions on a channel
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*/
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int gsi_channel_trans_init(struct gsi *gsi, u32 channel_id);
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/**
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* gsi_channel_trans_exit() - Inverse of gsi_channel_trans_init()
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* @channel: Channel whose transaction information is to be cleaned up
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*/
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void gsi_channel_trans_exit(struct gsi_channel *channel);
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/**
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* gsi_channel_doorbell() - Ring a channel's doorbell
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* @channel: Channel whose doorbell should be rung
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*
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* Rings a channel's doorbell to inform the GSI hardware that new
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* transactions (TREs, really) are available for it to process.
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*/
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void gsi_channel_doorbell(struct gsi_channel *channel);
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/**
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* gsi_ring_virt() - Return virtual address for a ring entry
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* @ring: Ring whose address is to be translated
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* @index: Index (slot number) of entry
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*/
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void *gsi_ring_virt(struct gsi_ring *ring, u32 index);
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/**
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* gsi_channel_tx_queued() - Report the number of bytes queued to hardware
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* @channel: Channel whose bytes have been queued
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*
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* This arranges for the the number of transactions and bytes for
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* transfer that have been queued to hardware to be reported. It
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* passes this information up the network stack so it can be used to
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* throttle transmissions.
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*/
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void gsi_channel_tx_queued(struct gsi_channel *channel);
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#endif /* _GSI_PRIVATE_H_ */
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