| /* SPDX-License-Identifier: GPL-2.0 */ |
| |
| /* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved. |
| * Copyright (C) 2019-2024 Linaro Ltd. |
| */ |
| #ifndef _GSI_TRANS_H_ |
| #define _GSI_TRANS_H_ |
| |
| #include <linux/completion.h> |
| #include <linux/dma-direction.h> |
| #include <linux/refcount.h> |
| #include <linux/types.h> |
| |
| #include "ipa_cmd.h" |
| |
| struct device; |
| struct page; |
| struct scatterlist; |
| struct sk_buff; |
| |
| struct gsi; |
| struct gsi_trans_pool; |
| |
| /* Maximum number of TREs in an IPA immediate command transaction */ |
| #define IPA_COMMAND_TRANS_TRE_MAX 8 |
| |
| /** |
| * struct gsi_trans - a GSI transaction |
| * |
| * Most fields in this structure for internal use by the transaction core code: |
| * @gsi: GSI pointer |
| * @channel_id: Channel number transaction is associated with |
| * @cancelled: If set by the core code, transaction was cancelled |
| * @rsvd_count: Number of TREs reserved for this transaction |
| * @used_count: Number of TREs *used* (could be less than rsvd_count) |
| * @len: Number of bytes sent or received by the transaction |
| * @data: Preserved but not touched by the core transaction code |
| * @cmd_opcode: Array of command opcodes (command channel only) |
| * @sgl: An array of scatter/gather entries managed by core code |
| * @direction: DMA transfer direction (DMA_NONE for commands) |
| * @refcount: Reference count used for destruction |
| * @completion: Completed when the transaction completes |
| * @byte_count: TX channel byte count recorded when transaction committed |
| * @trans_count: Channel transaction count when committed (for BQL accounting) |
| * |
| * The @len field is set when the transaction is committed. For RX |
| * transactions it is updated later to reflect the actual number of bytes |
| * received. |
| */ |
| struct gsi_trans { |
| struct gsi *gsi; |
| u8 channel_id; |
| |
| bool cancelled; /* true if transaction was cancelled */ |
| |
| u8 rsvd_count; /* # TREs requested */ |
| u8 used_count; /* # entries used in sgl[] */ |
| u32 len; /* total # bytes across sgl[] */ |
| |
| union { |
| void *data; |
| u8 cmd_opcode[IPA_COMMAND_TRANS_TRE_MAX]; |
| }; |
| struct scatterlist *sgl; |
| enum dma_data_direction direction; |
| |
| refcount_t refcount; |
| struct completion completion; |
| |
| u64 byte_count; /* channel byte_count when committed */ |
| u64 trans_count; /* channel trans_count when committed */ |
| }; |
| |
| /** |
| * gsi_trans_pool_init() - Initialize a pool of structures for transactions |
| * @pool: GSI transaction pool pointer |
| * @size: Size of elements in the pool |
| * @count: Minimum number of elements in the pool |
| * @max_alloc: Maximum number of elements allocated at a time from pool |
| * |
| * Return: 0 if successful, or a negative error code |
| */ |
| int gsi_trans_pool_init(struct gsi_trans_pool *pool, size_t size, u32 count, |
| u32 max_alloc); |
| |
| /** |
| * gsi_trans_pool_alloc() - Allocate one or more elements from a pool |
| * @pool: Pool pointer |
| * @count: Number of elements to allocate from the pool |
| * |
| * Return: Virtual address of element(s) allocated from the pool |
| */ |
| void *gsi_trans_pool_alloc(struct gsi_trans_pool *pool, u32 count); |
| |
| /** |
| * gsi_trans_pool_exit() - Inverse of gsi_trans_pool_init() |
| * @pool: Pool pointer |
| */ |
| void gsi_trans_pool_exit(struct gsi_trans_pool *pool); |
| |
| /** |
| * gsi_trans_pool_init_dma() - Initialize a pool of DMA-able structures |
| * @dev: Device used for DMA |
| * @pool: Pool pointer |
| * @size: Size of elements in the pool |
| * @count: Minimum number of elements in the pool |
| * @max_alloc: Maximum number of elements allocated at a time from pool |
| * |
| * Return: 0 if successful, or a negative error code |
| * |
| * Structures in this pool reside in DMA-coherent memory. |
| */ |
| int gsi_trans_pool_init_dma(struct device *dev, struct gsi_trans_pool *pool, |
| size_t size, u32 count, u32 max_alloc); |
| |
| /** |
| * gsi_trans_pool_alloc_dma() - Allocate an element from a DMA pool |
| * @pool: DMA pool pointer |
| * @addr: DMA address "handle" associated with the allocation |
| * |
| * Return: Virtual address of element allocated from the pool |
| * |
| * Only one element at a time may be allocated from a DMA pool. |
| */ |
| void *gsi_trans_pool_alloc_dma(struct gsi_trans_pool *pool, dma_addr_t *addr); |
| |
| /** |
| * gsi_trans_pool_exit_dma() - Inverse of gsi_trans_pool_init_dma() |
| * @dev: Device used for DMA |
| * @pool: Pool pointer |
| */ |
| void gsi_trans_pool_exit_dma(struct device *dev, struct gsi_trans_pool *pool); |
| |
| /** |
| * gsi_channel_trans_idle() - Return whether no transactions are allocated |
| * @gsi: GSI pointer |
| * @channel_id: Channel the transaction is associated with |
| * |
| * Return: True if no transactions are allocated, false otherwise |
| * |
| */ |
| bool gsi_channel_trans_idle(struct gsi *gsi, u32 channel_id); |
| |
| /** |
| * gsi_channel_trans_alloc() - Allocate a GSI transaction on a channel |
| * @gsi: GSI pointer |
| * @channel_id: Channel the transaction is associated with |
| * @tre_count: Number of elements in the transaction |
| * @direction: DMA direction for entire SGL (or DMA_NONE) |
| * |
| * Return: A GSI transaction structure, or a null pointer if all |
| * available transactions are in use |
| */ |
| struct gsi_trans *gsi_channel_trans_alloc(struct gsi *gsi, u32 channel_id, |
| u32 tre_count, |
| enum dma_data_direction direction); |
| |
| /** |
| * gsi_trans_free() - Free a previously-allocated GSI transaction |
| * @trans: Transaction to be freed |
| */ |
| void gsi_trans_free(struct gsi_trans *trans); |
| |
| /** |
| * gsi_trans_cmd_add() - Add an immediate command to a transaction |
| * @trans: Transaction |
| * @buf: Buffer pointer for command payload |
| * @size: Number of bytes in buffer |
| * @addr: DMA address for payload |
| * @opcode: IPA immediate command opcode |
| */ |
| void gsi_trans_cmd_add(struct gsi_trans *trans, void *buf, u32 size, |
| dma_addr_t addr, enum ipa_cmd_opcode opcode); |
| |
| /** |
| * gsi_trans_page_add() - Add a page transfer to a transaction |
| * @trans: Transaction |
| * @page: Page pointer |
| * @size: Number of bytes (starting at offset) to transfer |
| * @offset: Offset within page for start of transfer |
| */ |
| int gsi_trans_page_add(struct gsi_trans *trans, struct page *page, u32 size, |
| u32 offset); |
| |
| /** |
| * gsi_trans_skb_add() - Add a socket transfer to a transaction |
| * @trans: Transaction |
| * @skb: Socket buffer for transfer (outbound) |
| * |
| * Return: 0, or -EMSGSIZE if socket data won't fit in transaction. |
| */ |
| int gsi_trans_skb_add(struct gsi_trans *trans, struct sk_buff *skb); |
| |
| /** |
| * gsi_trans_commit() - Commit a GSI transaction |
| * @trans: Transaction to commit |
| * @ring_db: Whether to tell the hardware about these queued transfers |
| */ |
| void gsi_trans_commit(struct gsi_trans *trans, bool ring_db); |
| |
| /** |
| * gsi_trans_commit_wait() - Commit a GSI transaction and wait for it |
| * to complete |
| * @trans: Transaction to commit |
| */ |
| void gsi_trans_commit_wait(struct gsi_trans *trans); |
| |
| /** |
| * gsi_trans_read_byte() - Issue a single byte read TRE on a channel |
| * @gsi: GSI pointer |
| * @channel_id: Channel on which to read a byte |
| * @addr: DMA address into which to transfer the one byte |
| * |
| * This is not a transaction operation at all. It's defined here because |
| * it needs to be done in coordination with other transaction activity. |
| */ |
| int gsi_trans_read_byte(struct gsi *gsi, u32 channel_id, dma_addr_t addr); |
| |
| /** |
| * gsi_trans_read_byte_done() - Clean up after a single byte read TRE |
| * @gsi: GSI pointer |
| * @channel_id: Channel on which byte was read |
| * |
| * This function needs to be called to signal that the work related |
| * to reading a byte initiated by gsi_trans_read_byte() is complete. |
| */ |
| void gsi_trans_read_byte_done(struct gsi *gsi, u32 channel_id); |
| |
| #endif /* _GSI_TRANS_H_ */ |
