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linux/drivers/net/ipa/gsi_trans.h

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soc: qcom: ipa: GSI transactions This patch implements GSI transactions. A GSI transaction is a structure that represents a single request (consisting of one or more TREs) sent to the GSI hardware. The last TRE in a transaction includes a flag requesting that the GSI interrupt the AP to notify that it has completed. TREs are executed and completed strictly in order. For this reason, the completion of a single TRE implies that all previous TREs (in particular all of those "earlier" in a transaction) have completed. Whenever there is a need to send a request (a set of TREs) to the IPA, a GSI transaction is allocated, specifying the number of TREs that will be required. Details of the request (e.g. transfer offsets and length) are represented by in a Linux scatterlist array that is incorporated in the transaction structure. Once all commands (TREs) are added to a transaction it is committed. When the hardware signals that the request has completed, a callback function allows for cleanup or followup activity to be performed before the transaction is freed. Signed-off-by: Alex Elder <elder@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-03-06 07:28:23 +03:00
/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
* Copyright (C) 2019-2020 Linaro Ltd.
*/
#ifndef _GSI_TRANS_H_
#define _GSI_TRANS_H_
#include <linux/types.h>
#include <linux/refcount.h>
#include <linux/completion.h>
#include <linux/dma-direction.h>
#include "ipa_cmd.h"
struct scatterlist;
struct device;
struct sk_buff;
struct gsi;
struct gsi_trans;
struct gsi_trans_pool;
/**
* struct gsi_trans - a GSI transaction
*
* Most fields in this structure for internal use by the transaction core code:
* @links: Links for channel transaction lists by state
* @gsi: GSI pointer
* @channel_id: Channel number transaction is associated with
* @cancelled: If set by the core code, transaction was cancelled
* @tre_count: Number of TREs reserved for this transaction
* @used: Number of TREs *used* (could be less than tre_count)
* @len: Total # of transfer bytes represented in sgl[] (set by core)
* @data: Preserved but not touched by the core transaction code
* @sgl: An array of scatter/gather entries managed by core code
* @info: Array of command information structures (command channel)
* @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 size used for some fields in this structure were chosen to ensure
* the full structure size is no larger than 128 bytes.
*/
struct gsi_trans {
struct list_head links; /* gsi_channel lists */
struct gsi *gsi;
u8 channel_id;
bool cancelled; /* true if transaction was cancelled */
u8 tre_count; /* # TREs requested */
u8 used; /* # entries used in sgl[] */
u32 len; /* total # bytes across sgl[] */
void *data;
struct scatterlist *sgl;
struct ipa_cmd_info *info; /* array of entries, or null */
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
* @gsi: GSI 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
*
net: ipa: fix kerneldoc comments This commit affects comments (and in one case, whitespace) only. Throughout the IPA code, return statements are documented using "@Return:", whereas they should use "Return:" instead. Fix these mistakes. In function definitions, some parameters are missing their comment to describe them. And in structure definitions, some fields are missing their comment to describe them. Add these missing descriptions. Some arguments changed name and type along the way, but their descriptions were not updated (an endpoint pointer is now used in many places that previously used an endpoint ID). Fix these incorrect parameter descriptions. In the description for the ipa_clock structure, one field had a semicolon instead of a colon in its description. Fix this. Add a missing function description for ipa_gsi_endpoint_data_empty(). All of these issues were identified when building with "W=1". Signed-off-by: Alex Elder <elder@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-07-13 15:24:18 +03:00
* Return: 0 if successful, or a negative error code
soc: qcom: ipa: GSI transactions This patch implements GSI transactions. A GSI transaction is a structure that represents a single request (consisting of one or more TREs) sent to the GSI hardware. The last TRE in a transaction includes a flag requesting that the GSI interrupt the AP to notify that it has completed. TREs are executed and completed strictly in order. For this reason, the completion of a single TRE implies that all previous TREs (in particular all of those "earlier" in a transaction) have completed. Whenever there is a need to send a request (a set of TREs) to the IPA, a GSI transaction is allocated, specifying the number of TREs that will be required. Details of the request (e.g. transfer offsets and length) are represented by in a Linux scatterlist array that is incorporated in the transaction structure. Once all commands (TREs) are added to a transaction it is committed. When the hardware signals that the request has completed, a callback function allows for cleanup or followup activity to be performed before the transaction is freed. Signed-off-by: Alex Elder <elder@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-03-06 07:28:23 +03:00
*/
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
*
net: ipa: fix kerneldoc comments This commit affects comments (and in one case, whitespace) only. Throughout the IPA code, return statements are documented using "@Return:", whereas they should use "Return:" instead. Fix these mistakes. In function definitions, some parameters are missing their comment to describe them. And in structure definitions, some fields are missing their comment to describe them. Add these missing descriptions. Some arguments changed name and type along the way, but their descriptions were not updated (an endpoint pointer is now used in many places that previously used an endpoint ID). Fix these incorrect parameter descriptions. In the description for the ipa_clock structure, one field had a semicolon instead of a colon in its description. Fix this. Add a missing function description for ipa_gsi_endpoint_data_empty(). All of these issues were identified when building with "W=1". Signed-off-by: Alex Elder <elder@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-07-13 15:24:18 +03:00
* Return: Virtual address of element(s) allocated from the pool
soc: qcom: ipa: GSI transactions This patch implements GSI transactions. A GSI transaction is a structure that represents a single request (consisting of one or more TREs) sent to the GSI hardware. The last TRE in a transaction includes a flag requesting that the GSI interrupt the AP to notify that it has completed. TREs are executed and completed strictly in order. For this reason, the completion of a single TRE implies that all previous TREs (in particular all of those "earlier" in a transaction) have completed. Whenever there is a need to send a request (a set of TREs) to the IPA, a GSI transaction is allocated, specifying the number of TREs that will be required. Details of the request (e.g. transfer offsets and length) are represented by in a Linux scatterlist array that is incorporated in the transaction structure. Once all commands (TREs) are added to a transaction it is committed. When the hardware signals that the request has completed, a callback function allows for cleanup or followup activity to be performed before the transaction is freed. Signed-off-by: Alex Elder <elder@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-03-06 07:28:23 +03:00
*/
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
*
net: ipa: fix kerneldoc comments This commit affects comments (and in one case, whitespace) only. Throughout the IPA code, return statements are documented using "@Return:", whereas they should use "Return:" instead. Fix these mistakes. In function definitions, some parameters are missing their comment to describe them. And in structure definitions, some fields are missing their comment to describe them. Add these missing descriptions. Some arguments changed name and type along the way, but their descriptions were not updated (an endpoint pointer is now used in many places that previously used an endpoint ID). Fix these incorrect parameter descriptions. In the description for the ipa_clock structure, one field had a semicolon instead of a colon in its description. Fix this. Add a missing function description for ipa_gsi_endpoint_data_empty(). All of these issues were identified when building with "W=1". Signed-off-by: Alex Elder <elder@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-07-13 15:24:18 +03:00
* Return: 0 if successful, or a negative error code
soc: qcom: ipa: GSI transactions This patch implements GSI transactions. A GSI transaction is a structure that represents a single request (consisting of one or more TREs) sent to the GSI hardware. The last TRE in a transaction includes a flag requesting that the GSI interrupt the AP to notify that it has completed. TREs are executed and completed strictly in order. For this reason, the completion of a single TRE implies that all previous TREs (in particular all of those "earlier" in a transaction) have completed. Whenever there is a need to send a request (a set of TREs) to the IPA, a GSI transaction is allocated, specifying the number of TREs that will be required. Details of the request (e.g. transfer offsets and length) are represented by in a Linux scatterlist array that is incorporated in the transaction structure. Once all commands (TREs) are added to a transaction it is committed. When the hardware signals that the request has completed, a callback function allows for cleanup or followup activity to be performed before the transaction is freed. Signed-off-by: Alex Elder <elder@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-03-06 07:28:23 +03:00
*
* 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
*
net: ipa: fix kerneldoc comments This commit affects comments (and in one case, whitespace) only. Throughout the IPA code, return statements are documented using "@Return:", whereas they should use "Return:" instead. Fix these mistakes. In function definitions, some parameters are missing their comment to describe them. And in structure definitions, some fields are missing their comment to describe them. Add these missing descriptions. Some arguments changed name and type along the way, but their descriptions were not updated (an endpoint pointer is now used in many places that previously used an endpoint ID). Fix these incorrect parameter descriptions. In the description for the ipa_clock structure, one field had a semicolon instead of a colon in its description. Fix this. Add a missing function description for ipa_gsi_endpoint_data_empty(). All of these issues were identified when building with "W=1". Signed-off-by: Alex Elder <elder@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-07-13 15:24:18 +03:00
* Return: Virtual address of element allocated from the pool
soc: qcom: ipa: GSI transactions This patch implements GSI transactions. A GSI transaction is a structure that represents a single request (consisting of one or more TREs) sent to the GSI hardware. The last TRE in a transaction includes a flag requesting that the GSI interrupt the AP to notify that it has completed. TREs are executed and completed strictly in order. For this reason, the completion of a single TRE implies that all previous TREs (in particular all of those "earlier" in a transaction) have completed. Whenever there is a need to send a request (a set of TREs) to the IPA, a GSI transaction is allocated, specifying the number of TREs that will be required. Details of the request (e.g. transfer offsets and length) are represented by in a Linux scatterlist array that is incorporated in the transaction structure. Once all commands (TREs) are added to a transaction it is committed. When the hardware signals that the request has completed, a callback function allows for cleanup or followup activity to be performed before the transaction is freed. Signed-off-by: Alex Elder <elder@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-03-06 07:28:23 +03:00
*
* 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() - Inverse of gsi_trans_pool_init()
* @pool: Pool pointer
*/
void gsi_trans_pool_exit_dma(struct device *dev, struct gsi_trans_pool *pool);
/**
* 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)
*
net: ipa: fix kerneldoc comments This commit affects comments (and in one case, whitespace) only. Throughout the IPA code, return statements are documented using "@Return:", whereas they should use "Return:" instead. Fix these mistakes. In function definitions, some parameters are missing their comment to describe them. And in structure definitions, some fields are missing their comment to describe them. Add these missing descriptions. Some arguments changed name and type along the way, but their descriptions were not updated (an endpoint pointer is now used in many places that previously used an endpoint ID). Fix these incorrect parameter descriptions. In the description for the ipa_clock structure, one field had a semicolon instead of a colon in its description. Fix this. Add a missing function description for ipa_gsi_endpoint_data_empty(). All of these issues were identified when building with "W=1". Signed-off-by: Alex Elder <elder@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-07-13 15:24:18 +03:00
* Return: A GSI transaction structure, or a null pointer if all
soc: qcom: ipa: GSI transactions This patch implements GSI transactions. A GSI transaction is a structure that represents a single request (consisting of one or more TREs) sent to the GSI hardware. The last TRE in a transaction includes a flag requesting that the GSI interrupt the AP to notify that it has completed. TREs are executed and completed strictly in order. For this reason, the completion of a single TRE implies that all previous TREs (in particular all of those "earlier" in a transaction) have completed. Whenever there is a need to send a request (a set of TREs) to the IPA, a GSI transaction is allocated, specifying the number of TREs that will be required. Details of the request (e.g. transfer offsets and length) are represented by in a Linux scatterlist array that is incorporated in the transaction structure. Once all commands (TREs) are added to a transaction it is committed. When the hardware signals that the request has completed, a callback function allows for cleanup or followup activity to be performed before the transaction is freed. Signed-off-by: Alex Elder <elder@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-03-06 07:28:23 +03:00
* 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
* @direction: Direction of DMA transfer (or DMA_NONE if none required)
* @opcode: IPA immediate command opcode
*/
void gsi_trans_cmd_add(struct gsi_trans *trans, void *buf, u32 size,
dma_addr_t addr, enum dma_data_direction direction,
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)
*
net: ipa: fix kerneldoc comments This commit affects comments (and in one case, whitespace) only. Throughout the IPA code, return statements are documented using "@Return:", whereas they should use "Return:" instead. Fix these mistakes. In function definitions, some parameters are missing their comment to describe them. And in structure definitions, some fields are missing their comment to describe them. Add these missing descriptions. Some arguments changed name and type along the way, but their descriptions were not updated (an endpoint pointer is now used in many places that previously used an endpoint ID). Fix these incorrect parameter descriptions. In the description for the ipa_clock structure, one field had a semicolon instead of a colon in its description. Fix this. Add a missing function description for ipa_gsi_endpoint_data_empty(). All of these issues were identified when building with "W=1". Signed-off-by: Alex Elder <elder@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-07-13 15:24:18 +03:00
* Return: 0, or -EMSGSIZE if socket data won't fit in transaction.
soc: qcom: ipa: GSI transactions This patch implements GSI transactions. A GSI transaction is a structure that represents a single request (consisting of one or more TREs) sent to the GSI hardware. The last TRE in a transaction includes a flag requesting that the GSI interrupt the AP to notify that it has completed. TREs are executed and completed strictly in order. For this reason, the completion of a single TRE implies that all previous TREs (in particular all of those "earlier" in a transaction) have completed. Whenever there is a need to send a request (a set of TREs) to the IPA, a GSI transaction is allocated, specifying the number of TREs that will be required. Details of the request (e.g. transfer offsets and length) are represented by in a Linux scatterlist array that is incorporated in the transaction structure. Once all commands (TREs) are added to a transaction it is committed. When the hardware signals that the request has completed, a callback function allows for cleanup or followup activity to be performed before the transaction is freed. Signed-off-by: Alex Elder <elder@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-03-06 07:28:23 +03:00
*/
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_commit_wait_timeout() - Commit a GSI transaction and wait for
* it to complete, with timeout
* @trans: Transaction to commit
* @timeout: Timeout period (in milliseconds)
*/
int gsi_trans_commit_wait_timeout(struct gsi_trans *trans,
unsigned long timeout);
/**
* 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_ */
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