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3883c6fbf2
On several systems we've noticed that when NTB link goes down, the Physical Layer User Test Pattern registers we use as additional scratchpad registers (that is explicitly allowed by the chip specs) become read-only for about 100us. I see no explanation for this in the chip specs, neither why it was not seen before, may be a race. Since we do need these registers, workaround it by repeating writes until we succeed or 1ms timeout expire. MFC after: 1 week
455 lines
16 KiB
C
455 lines
16 KiB
C
/*-
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* Copyright (c) 2016 Alexander Motin <mav@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _NTB_H_
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#define _NTB_H_
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#include "ntb_if.h"
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SYSCTL_DECL(_hw_ntb);
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int ntb_register_device(device_t ntb);
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int ntb_unregister_device(device_t ntb);
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int ntb_child_location(device_t dev, device_t child, struct sbuf *sb);
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int ntb_print_child(device_t dev, device_t child);
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bus_dma_tag_t ntb_get_dma_tag(device_t bus, device_t child);
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/*
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* ntb_link_event() - notify driver context of a change in link status
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* @ntb: NTB device context
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*
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* Notify the driver context that the link status may have changed. The driver
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* should call intb_link_is_up() to get the current status.
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*/
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void ntb_link_event(device_t ntb);
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/*
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* ntb_db_event() - notify driver context of a doorbell event
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* @ntb: NTB device context
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* @vector: Interrupt vector number
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*
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* Notify the driver context of a doorbell event. If hardware supports
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* multiple interrupt vectors for doorbells, the vector number indicates which
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* vector received the interrupt. The vector number is relative to the first
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* vector used for doorbells, starting at zero, and must be less than
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* ntb_db_vector_count(). The driver may call ntb_db_read() to check which
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* doorbell bits need service, and ntb_db_vector_mask() to determine which of
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* those bits are associated with the vector number.
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*/
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void ntb_db_event(device_t ntb, uint32_t vec);
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/**
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* ntb_port_number() - get the local port number
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* @ntb: NTB device context.
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*
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* Hardware driver returns local port number in compliance with topology.
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*
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* Return: the local port number
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*/
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int ntb_port_number(device_t ntb);
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/**
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* ntb_port_count() - get the number of peer device ports
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* @ntb: NTB device context.
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*
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* By default hardware driver supports just one peer device.
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*
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* Return: the number of peer ports
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*/
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int ntb_peer_port_count(device_t ntb);
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/**
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* ntb_peer_port_number() - get the peer port by given index
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* @ntb: NTB device context.
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* @idx: Peer port index (should be zero for now).
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*
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* By default hardware driver supports just one peer device, so this method
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* shall return the corresponding value.
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*
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* Return: the peer device port or an error number
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*/
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int ntb_peer_port_number(device_t ntb, int pidx);
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/*
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* ntb_peer_port_idx() - get the peer device port index by given port
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* number
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* @ntb: NTB device context.
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* @port: Peer port number
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*
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* By default hardware driver supports just one peer device, so given a
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* valid peer port number, the return value shall be zero.
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*
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* Return: the peer port index or an error number
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*/
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int ntb_peer_port_idx(device_t ntb, int port);
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/*
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* ntb_link_is_up() - get the current ntb link state
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* @ntb: NTB device context
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* @speed: OUT - The link speed expressed as PCIe generation number
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* @width: OUT - The link width expressed as the number of PCIe lanes
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*
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* RETURNS: true or false based on the hardware link state
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*/
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bool ntb_link_is_up(device_t ntb, enum ntb_speed *speed, enum ntb_width *width);
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/*
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* ntb_link_enable() - enable the link on the secondary side of the ntb
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* @ntb: NTB device context
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* @max_speed: The maximum link speed expressed as PCIe generation number[0]
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* @max_width: The maximum link width expressed as the number of PCIe lanes[0]
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*
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* Enable the link on the secondary side of the ntb. This can only be done
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* from the primary side of the ntb in primary or b2b topology. The ntb device
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* should train the link to its maximum speed and width, or the requested speed
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* and width, whichever is smaller, if supported.
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*
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* Return: Zero on success, otherwise an error number.
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*
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* [0]: Only NTB_SPEED_AUTO and NTB_WIDTH_AUTO are valid inputs; other speed
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* and width input will be ignored.
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*/
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int ntb_link_enable(device_t ntb, enum ntb_speed speed, enum ntb_width width);
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/*
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* ntb_link_disable() - disable the link on the secondary side of the ntb
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* @ntb: NTB device context
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*
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* Disable the link on the secondary side of the ntb. This can only be done
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* from the primary side of the ntb in primary or b2b topology. The ntb device
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* should disable the link. Returning from this call must indicate that a
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* barrier has passed, though with no more writes may pass in either direction
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* across the link, except if this call returns an error number.
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*
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* Return: Zero on success, otherwise an error number.
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*/
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int ntb_link_disable(device_t ntb);
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/*
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* get enable status of the link on the secondary side of the ntb
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*/
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bool ntb_link_enabled(device_t ntb);
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/*
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* ntb_set_ctx() - associate a driver context with an ntb device
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* @ntb: NTB device context
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* @ctx: Driver context
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* @ctx_ops: Driver context operations
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*
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* Associate a driver context and operations with a ntb device. The context is
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* provided by the client driver, and the driver may associate a different
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* context with each ntb device.
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*
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* Return: Zero if the context is associated, otherwise an error number.
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*/
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int ntb_set_ctx(device_t ntb, void *ctx, const struct ntb_ctx_ops *ctx_ops);
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/*
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* ntb_set_ctx() - get a driver context associated with an ntb device
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* @ntb: NTB device context
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* @ctx_ops: Driver context operations
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*
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* Get a driver context and operations associated with a ntb device.
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*/
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void * ntb_get_ctx(device_t ntb, const struct ntb_ctx_ops **ctx_ops);
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/*
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* ntb_clear_ctx() - disassociate any driver context from an ntb device
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* @ntb: NTB device context
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*
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* Clear any association that may exist between a driver context and the ntb
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* device.
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*/
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void ntb_clear_ctx(device_t ntb);
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/*
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* ntb_mw_count() - Get the number of memory windows available for KPI
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* consumers.
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*
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* (Excludes any MW wholly reserved for register access.)
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*/
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uint8_t ntb_mw_count(device_t ntb);
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/*
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* ntb_mw_get_range() - get the range of a memory window
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* @ntb: NTB device context
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* @idx: Memory window number
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* @base: OUT - the base address for mapping the memory window
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* @size: OUT - the size for mapping the memory window
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* @align: OUT - the base alignment for translating the memory window
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* @align_size: OUT - the size alignment for translating the memory window
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*
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* Get the range of a memory window. NULL may be given for any output
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* parameter if the value is not needed. The base and size may be used for
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* mapping the memory window, to access the peer memory. The alignment and
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* size may be used for translating the memory window, for the peer to access
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* memory on the local system.
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*
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* Return: Zero on success, otherwise an error number.
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*/
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int ntb_mw_get_range(device_t ntb, unsigned mw_idx, vm_paddr_t *base,
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caddr_t *vbase, size_t *size, size_t *align, size_t *align_size,
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bus_addr_t *plimit);
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/*
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* ntb_mw_set_trans() - set the translation of a memory window
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* @ntb: NTB device context
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* @idx: Memory window number
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* @addr: The dma address local memory to expose to the peer
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* @size: The size of the local memory to expose to the peer
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*
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* Set the translation of a memory window. The peer may access local memory
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* through the window starting at the address, up to the size. The address
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* must be aligned to the alignment specified by ntb_mw_get_range(). The size
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* must be aligned to the size alignment specified by ntb_mw_get_range(). The
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* address must be below the plimit specified by ntb_mw_get_range() (i.e. for
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* 32-bit BARs).
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*
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* Return: Zero on success, otherwise an error number.
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*/
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int ntb_mw_set_trans(device_t ntb, unsigned mw_idx, bus_addr_t addr,
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size_t size);
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/*
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* ntb_mw_clear_trans() - clear the translation of a memory window
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* @ntb: NTB device context
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* @idx: Memory window number
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*
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* Clear the translation of a memory window. The peer may no longer access
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* local memory through the window.
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*
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* Return: Zero on success, otherwise an error number.
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*/
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int ntb_mw_clear_trans(device_t ntb, unsigned mw_idx);
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/*
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* ntb_mw_get_wc - Get the write-combine status of a memory window
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*
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* Returns: Zero on success, setting *wc; otherwise an error number (e.g. if
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* idx is an invalid memory window).
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*
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* Mode is a VM_MEMATTR_* type.
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*/
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int ntb_mw_get_wc(device_t ntb, unsigned mw_idx, vm_memattr_t *mode);
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/*
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* ntb_mw_set_wc - Set the write-combine status of a memory window
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*
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* If 'mode' matches the current status, this does nothing and succeeds. Mode
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* is a VM_MEMATTR_* type.
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*
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* Returns: Zero on success, setting the caching attribute on the virtual
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* mapping of the BAR; otherwise an error number (e.g. if idx is an invalid
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* memory window, or if changing the caching attribute fails).
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*/
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int ntb_mw_set_wc(device_t ntb, unsigned mw_idx, vm_memattr_t mode);
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/*
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* ntb_spad_count() - get the total scratch regs usable
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* @ntb: pointer to ntb_softc instance
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*
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* This function returns the max 32bit scratchpad registers usable by the
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* upper layer.
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*
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* RETURNS: total number of scratch pad registers available
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*/
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uint8_t ntb_spad_count(device_t ntb);
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/*
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* ntb_spad_clear() - zero local scratch registers
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* @ntb: pointer to ntb_softc instance
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*
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* This functions overwrites all local scratchpad registers with zeroes.
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*/
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void ntb_spad_clear(device_t ntb);
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/*
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* ntb_spad_write() - write to the secondary scratchpad register
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* @ntb: pointer to ntb_softc instance
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* @idx: index to the scratchpad register, 0 based
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* @val: the data value to put into the register
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*
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* This function allows writing of a 32bit value to the indexed scratchpad
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* register. The register resides on the secondary (external) side.
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*
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* RETURNS: An appropriate ERRNO error value on error, or zero for success.
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*/
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int ntb_spad_write(device_t ntb, unsigned int idx, uint32_t val);
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/*
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* ntb_spad_read() - read from the primary scratchpad register
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* @ntb: pointer to ntb_softc instance
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* @idx: index to scratchpad register, 0 based
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* @val: pointer to 32bit integer for storing the register value
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*
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* This function allows reading of the 32bit scratchpad register on
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* the primary (internal) side.
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*
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* RETURNS: An appropriate ERRNO error value on error, or zero for success.
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*/
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int ntb_spad_read(device_t ntb, unsigned int idx, uint32_t *val);
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/*
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* ntb_peer_spad_write() - write to the secondary scratchpad register
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* @ntb: pointer to ntb_softc instance
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* @idx: index to the scratchpad register, 0 based
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* @val: the data value to put into the register
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*
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* This function allows writing of a 32bit value to the indexed scratchpad
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* register. The register resides on the secondary (external) side.
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*
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* RETURNS: An appropriate ERRNO error value on error, or zero for success.
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*/
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int ntb_peer_spad_write(device_t ntb, unsigned int idx, uint32_t val);
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/*
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* ntb_peer_spad_read() - read from the primary scratchpad register
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* @ntb: pointer to ntb_softc instance
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* @idx: index to scratchpad register, 0 based
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* @val: pointer to 32bit integer for storing the register value
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*
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* This function allows reading of the 32bit scratchpad register on
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* the primary (internal) side.
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*
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* RETURNS: An appropriate ERRNO error value on error, or zero for success.
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*/
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int ntb_peer_spad_read(device_t ntb, unsigned int idx, uint32_t *val);
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/*
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* ntb_db_valid_mask() - get a mask of doorbell bits supported by the ntb
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* @ntb: NTB device context
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*
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* Hardware may support different number or arrangement of doorbell bits.
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*
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* Return: A mask of doorbell bits supported by the ntb.
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*/
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uint64_t ntb_db_valid_mask(device_t ntb);
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/*
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* ntb_db_vector_count() - get the number of doorbell interrupt vectors
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* @ntb: NTB device context.
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*
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* Hardware may support different number of interrupt vectors.
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*
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* Return: The number of doorbell interrupt vectors.
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*/
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int ntb_db_vector_count(device_t ntb);
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/*
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* ntb_db_vector_mask() - get a mask of doorbell bits serviced by a vector
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* @ntb: NTB device context
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* @vector: Doorbell vector number
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*
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* Each interrupt vector may have a different number or arrangement of bits.
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*
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* Return: A mask of doorbell bits serviced by a vector.
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*/
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uint64_t ntb_db_vector_mask(device_t ntb, uint32_t vector);
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/*
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* ntb_peer_db_addr() - address and size of the peer doorbell register
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* @ntb: NTB device context.
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* @db_addr: OUT - The address of the peer doorbell register.
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* @db_size: OUT - The number of bytes to write the peer doorbell register.
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*
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* Return the address of the peer doorbell register. This may be used, for
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* example, by drivers that offload memory copy operations to a dma engine.
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* The drivers may wish to ring the peer doorbell at the completion of memory
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* copy operations. For efficiency, and to simplify ordering of operations
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* between the dma memory copies and the ringing doorbell, the driver may
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* append one additional dma memory copy with the doorbell register as the
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* destination, after the memory copy operations.
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*
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* Return: Zero on success, otherwise an error number.
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*
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* Note that writing the peer doorbell via a memory window will *not* generate
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* an interrupt on the remote host; that must be done separately.
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*/
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int ntb_peer_db_addr(device_t ntb, bus_addr_t *db_addr, vm_size_t *db_size);
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/*
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* ntb_db_clear() - clear bits in the local doorbell register
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* @ntb: NTB device context.
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* @db_bits: Doorbell bits to clear.
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*
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* Clear bits in the local doorbell register, arming the bits for the next
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* doorbell.
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*
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* Return: Zero on success, otherwise an error number.
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*/
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void ntb_db_clear(device_t ntb, uint64_t bits);
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/*
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* ntb_db_clear_mask() - clear bits in the local doorbell mask
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* @ntb: NTB device context.
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* @db_bits: Doorbell bits to clear.
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*
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* Clear bits in the local doorbell mask register, allowing doorbell interrupts
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* from being generated for those doorbell bits. If a doorbell bit is already
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* set at the time the mask is cleared, and the corresponding mask bit is
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* changed from set to clear, then the ntb driver must ensure that
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* ntb_db_event() is called. If the hardware does not generate the interrupt
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* on clearing the mask bit, then the driver must call ntb_db_event() anyway.
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*
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* Return: Zero on success, otherwise an error number.
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*/
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void ntb_db_clear_mask(device_t ntb, uint64_t bits);
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/*
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* ntb_db_read() - read the local doorbell register
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* @ntb: NTB device context.
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*
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* Read the local doorbell register, and return the bits that are set.
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*
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* Return: The bits currently set in the local doorbell register.
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*/
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uint64_t ntb_db_read(device_t ntb);
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/*
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* ntb_db_set_mask() - set bits in the local doorbell mask
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* @ntb: NTB device context.
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* @db_bits: Doorbell mask bits to set.
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*
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* Set bits in the local doorbell mask register, preventing doorbell interrupts
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* from being generated for those doorbell bits. Bits that were already set
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* must remain set.
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*
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* Return: Zero on success, otherwise an error number.
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*/
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void ntb_db_set_mask(device_t ntb, uint64_t bits);
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/*
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* ntb_peer_db_set() - Set the doorbell on the secondary/external side
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* @ntb: pointer to ntb_softc instance
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* @bit: doorbell bits to ring
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*
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* This function allows triggering of a doorbell on the secondary/external
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* side that will initiate an interrupt on the remote host
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*/
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void ntb_peer_db_set(device_t ntb, uint64_t bits);
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#endif /* _NTB_H_ */
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