475 lines
14 KiB
C
475 lines
14 KiB
C
/*
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* Thunderbolt Cactus Ridge driver - bus logic (NHI independent)
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*
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* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
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*/
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#ifndef TB_H_
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#define TB_H_
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#include <linux/nvmem-provider.h>
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#include <linux/pci.h>
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#include <linux/uuid.h>
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#include "tb_regs.h"
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#include "ctl.h"
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#include "dma_port.h"
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/**
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* struct tb_switch_nvm - Structure holding switch NVM information
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* @major: Major version number of the active NVM portion
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* @minor: Minor version number of the active NVM portion
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* @id: Identifier used with both NVM portions
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* @active: Active portion NVMem device
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* @non_active: Non-active portion NVMem device
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* @buf: Buffer where the NVM image is stored before it is written to
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* the actual NVM flash device
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* @buf_data_size: Number of bytes actually consumed by the new NVM
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* image
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* @authenticating: The switch is authenticating the new NVM
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*/
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struct tb_switch_nvm {
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u8 major;
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u8 minor;
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int id;
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struct nvmem_device *active;
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struct nvmem_device *non_active;
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void *buf;
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size_t buf_data_size;
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bool authenticating;
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};
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/**
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* enum tb_security_level - Thunderbolt security level
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* @TB_SECURITY_NONE: No security, legacy mode
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* @TB_SECURITY_USER: User approval required at minimum
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* @TB_SECURITY_SECURE: One time saved key required at minimum
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* @TB_SECURITY_DPONLY: Only tunnel Display port (and USB)
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*/
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enum tb_security_level {
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TB_SECURITY_NONE,
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TB_SECURITY_USER,
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TB_SECURITY_SECURE,
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TB_SECURITY_DPONLY,
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};
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#define TB_SWITCH_KEY_SIZE 32
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/* Each physical port contains 2 links on modern controllers */
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#define TB_SWITCH_LINKS_PER_PHY_PORT 2
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/**
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* struct tb_switch - a thunderbolt switch
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* @dev: Device for the switch
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* @config: Switch configuration
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* @ports: Ports in this switch
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* @dma_port: If the switch has port supporting DMA configuration based
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* mailbox this will hold the pointer to that (%NULL
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* otherwise). If set it also means the switch has
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* upgradeable NVM.
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* @tb: Pointer to the domain the switch belongs to
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* @uid: Unique ID of the switch
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* @uuid: UUID of the switch (or %NULL if not supported)
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* @vendor: Vendor ID of the switch
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* @device: Device ID of the switch
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* @vendor_name: Name of the vendor (or %NULL if not known)
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* @device_name: Name of the device (or %NULL if not known)
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* @generation: Switch Thunderbolt generation
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* @cap_plug_events: Offset to the plug events capability (%0 if not found)
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* @is_unplugged: The switch is going away
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* @drom: DROM of the switch (%NULL if not found)
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* @nvm: Pointer to the NVM if the switch has one (%NULL otherwise)
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* @no_nvm_upgrade: Prevent NVM upgrade of this switch
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* @safe_mode: The switch is in safe-mode
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* @authorized: Whether the switch is authorized by user or policy
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* @work: Work used to automatically authorize a switch
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* @security_level: Switch supported security level
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* @key: Contains the key used to challenge the device or %NULL if not
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* supported. Size of the key is %TB_SWITCH_KEY_SIZE.
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* @connection_id: Connection ID used with ICM messaging
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* @connection_key: Connection key used with ICM messaging
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* @link: Root switch link this switch is connected (ICM only)
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* @depth: Depth in the chain this switch is connected (ICM only)
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*
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* When the switch is being added or removed to the domain (other
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* switches) you need to have domain lock held. For switch authorization
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* internal switch_lock is enough.
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*/
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struct tb_switch {
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struct device dev;
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struct tb_regs_switch_header config;
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struct tb_port *ports;
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struct tb_dma_port *dma_port;
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struct tb *tb;
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u64 uid;
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uuid_be *uuid;
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u16 vendor;
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u16 device;
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const char *vendor_name;
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const char *device_name;
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unsigned int generation;
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int cap_plug_events;
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bool is_unplugged;
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u8 *drom;
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struct tb_switch_nvm *nvm;
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bool no_nvm_upgrade;
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bool safe_mode;
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unsigned int authorized;
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struct work_struct work;
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enum tb_security_level security_level;
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u8 *key;
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u8 connection_id;
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u8 connection_key;
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u8 link;
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u8 depth;
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};
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/**
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* struct tb_port - a thunderbolt port, part of a tb_switch
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*/
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struct tb_port {
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struct tb_regs_port_header config;
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struct tb_switch *sw;
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struct tb_port *remote; /* remote port, NULL if not connected */
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int cap_phy; /* offset, zero if not found */
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u8 port; /* port number on switch */
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bool disabled; /* disabled by eeprom */
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struct tb_port *dual_link_port;
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u8 link_nr:1;
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};
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/**
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* struct tb_path_hop - routing information for a tb_path
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*
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* Hop configuration is always done on the IN port of a switch.
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* in_port and out_port have to be on the same switch. Packets arriving on
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* in_port with "hop" = in_hop_index will get routed to through out_port. The
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* next hop to take (on out_port->remote) is determined by next_hop_index.
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*
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* in_counter_index is the index of a counter (in TB_CFG_COUNTERS) on the in
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* port.
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*/
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struct tb_path_hop {
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struct tb_port *in_port;
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struct tb_port *out_port;
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int in_hop_index;
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int in_counter_index; /* write -1 to disable counters for this hop. */
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int next_hop_index;
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};
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/**
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* enum tb_path_port - path options mask
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*/
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enum tb_path_port {
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TB_PATH_NONE = 0,
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TB_PATH_SOURCE = 1, /* activate on the first hop (out of src) */
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TB_PATH_INTERNAL = 2, /* activate on other hops (not the first/last) */
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TB_PATH_DESTINATION = 4, /* activate on the last hop (into dst) */
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TB_PATH_ALL = 7,
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};
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/**
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* struct tb_path - a unidirectional path between two ports
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*
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* A path consists of a number of hops (see tb_path_hop). To establish a PCIe
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* tunnel two paths have to be created between the two PCIe ports.
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*
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*/
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struct tb_path {
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struct tb *tb;
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int nfc_credits; /* non flow controlled credits */
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enum tb_path_port ingress_shared_buffer;
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enum tb_path_port egress_shared_buffer;
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enum tb_path_port ingress_fc_enable;
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enum tb_path_port egress_fc_enable;
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int priority:3;
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int weight:4;
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bool drop_packages;
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bool activated;
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struct tb_path_hop *hops;
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int path_length; /* number of hops */
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};
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/**
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* struct tb_cm_ops - Connection manager specific operations vector
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* @driver_ready: Called right after control channel is started. Used by
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* ICM to send driver ready message to the firmware.
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* @start: Starts the domain
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* @stop: Stops the domain
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* @suspend_noirq: Connection manager specific suspend_noirq
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* @resume_noirq: Connection manager specific resume_noirq
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* @suspend: Connection manager specific suspend
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* @complete: Connection manager specific complete
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* @handle_event: Handle thunderbolt event
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* @approve_switch: Approve switch
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* @add_switch_key: Add key to switch
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* @challenge_switch_key: Challenge switch using key
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* @disconnect_pcie_paths: Disconnects PCIe paths before NVM update
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*/
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struct tb_cm_ops {
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int (*driver_ready)(struct tb *tb);
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int (*start)(struct tb *tb);
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void (*stop)(struct tb *tb);
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int (*suspend_noirq)(struct tb *tb);
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int (*resume_noirq)(struct tb *tb);
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int (*suspend)(struct tb *tb);
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void (*complete)(struct tb *tb);
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void (*handle_event)(struct tb *tb, enum tb_cfg_pkg_type,
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const void *buf, size_t size);
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int (*approve_switch)(struct tb *tb, struct tb_switch *sw);
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int (*add_switch_key)(struct tb *tb, struct tb_switch *sw);
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int (*challenge_switch_key)(struct tb *tb, struct tb_switch *sw,
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const u8 *challenge, u8 *response);
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int (*disconnect_pcie_paths)(struct tb *tb);
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};
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/**
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* struct tb - main thunderbolt bus structure
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* @dev: Domain device
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* @lock: Big lock. Must be held when accessing any struct
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* tb_switch / struct tb_port.
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* @nhi: Pointer to the NHI structure
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* @ctl: Control channel for this domain
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* @wq: Ordered workqueue for all domain specific work
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* @root_switch: Root switch of this domain
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* @cm_ops: Connection manager specific operations vector
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* @index: Linux assigned domain number
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* @security_level: Current security level
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* @privdata: Private connection manager specific data
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*/
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struct tb {
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struct device dev;
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struct mutex lock;
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struct tb_nhi *nhi;
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struct tb_ctl *ctl;
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struct workqueue_struct *wq;
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struct tb_switch *root_switch;
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const struct tb_cm_ops *cm_ops;
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int index;
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enum tb_security_level security_level;
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unsigned long privdata[0];
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};
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static inline void *tb_priv(struct tb *tb)
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{
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return (void *)tb->privdata;
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}
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/* helper functions & macros */
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/**
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* tb_upstream_port() - return the upstream port of a switch
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*
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* Every switch has an upstream port (for the root switch it is the NHI).
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*
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* During switch alloc/init tb_upstream_port()->remote may be NULL, even for
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* non root switches (on the NHI port remote is always NULL).
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*
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* Return: Returns the upstream port of the switch.
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*/
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static inline struct tb_port *tb_upstream_port(struct tb_switch *sw)
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{
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return &sw->ports[sw->config.upstream_port_number];
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}
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static inline u64 tb_route(struct tb_switch *sw)
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{
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return ((u64) sw->config.route_hi) << 32 | sw->config.route_lo;
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}
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static inline struct tb_port *tb_port_at(u64 route, struct tb_switch *sw)
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{
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u8 port;
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port = route >> (sw->config.depth * 8);
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if (WARN_ON(port > sw->config.max_port_number))
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return NULL;
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return &sw->ports[port];
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}
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static inline int tb_sw_read(struct tb_switch *sw, void *buffer,
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enum tb_cfg_space space, u32 offset, u32 length)
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{
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return tb_cfg_read(sw->tb->ctl,
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buffer,
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tb_route(sw),
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0,
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space,
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offset,
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length);
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}
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static inline int tb_sw_write(struct tb_switch *sw, void *buffer,
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enum tb_cfg_space space, u32 offset, u32 length)
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{
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return tb_cfg_write(sw->tb->ctl,
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buffer,
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tb_route(sw),
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0,
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space,
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offset,
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length);
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}
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static inline int tb_port_read(struct tb_port *port, void *buffer,
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enum tb_cfg_space space, u32 offset, u32 length)
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{
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return tb_cfg_read(port->sw->tb->ctl,
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buffer,
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tb_route(port->sw),
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port->port,
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space,
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offset,
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length);
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}
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static inline int tb_port_write(struct tb_port *port, const void *buffer,
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enum tb_cfg_space space, u32 offset, u32 length)
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{
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return tb_cfg_write(port->sw->tb->ctl,
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buffer,
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tb_route(port->sw),
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port->port,
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space,
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offset,
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length);
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}
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#define tb_err(tb, fmt, arg...) dev_err(&(tb)->nhi->pdev->dev, fmt, ## arg)
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#define tb_WARN(tb, fmt, arg...) dev_WARN(&(tb)->nhi->pdev->dev, fmt, ## arg)
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#define tb_warn(tb, fmt, arg...) dev_warn(&(tb)->nhi->pdev->dev, fmt, ## arg)
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#define tb_info(tb, fmt, arg...) dev_info(&(tb)->nhi->pdev->dev, fmt, ## arg)
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#define __TB_SW_PRINT(level, sw, fmt, arg...) \
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do { \
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struct tb_switch *__sw = (sw); \
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level(__sw->tb, "%llx: " fmt, \
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tb_route(__sw), ## arg); \
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} while (0)
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#define tb_sw_WARN(sw, fmt, arg...) __TB_SW_PRINT(tb_WARN, sw, fmt, ##arg)
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#define tb_sw_warn(sw, fmt, arg...) __TB_SW_PRINT(tb_warn, sw, fmt, ##arg)
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#define tb_sw_info(sw, fmt, arg...) __TB_SW_PRINT(tb_info, sw, fmt, ##arg)
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#define __TB_PORT_PRINT(level, _port, fmt, arg...) \
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do { \
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struct tb_port *__port = (_port); \
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level(__port->sw->tb, "%llx:%x: " fmt, \
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tb_route(__port->sw), __port->port, ## arg); \
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} while (0)
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#define tb_port_WARN(port, fmt, arg...) \
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__TB_PORT_PRINT(tb_WARN, port, fmt, ##arg)
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#define tb_port_warn(port, fmt, arg...) \
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__TB_PORT_PRINT(tb_warn, port, fmt, ##arg)
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#define tb_port_info(port, fmt, arg...) \
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__TB_PORT_PRINT(tb_info, port, fmt, ##arg)
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struct tb *icm_probe(struct tb_nhi *nhi);
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struct tb *tb_probe(struct tb_nhi *nhi);
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extern struct bus_type tb_bus_type;
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extern struct device_type tb_domain_type;
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extern struct device_type tb_switch_type;
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int tb_domain_init(void);
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void tb_domain_exit(void);
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void tb_switch_exit(void);
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struct tb *tb_domain_alloc(struct tb_nhi *nhi, size_t privsize);
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int tb_domain_add(struct tb *tb);
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void tb_domain_remove(struct tb *tb);
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int tb_domain_suspend_noirq(struct tb *tb);
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int tb_domain_resume_noirq(struct tb *tb);
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int tb_domain_suspend(struct tb *tb);
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void tb_domain_complete(struct tb *tb);
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int tb_domain_approve_switch(struct tb *tb, struct tb_switch *sw);
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int tb_domain_approve_switch_key(struct tb *tb, struct tb_switch *sw);
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int tb_domain_challenge_switch_key(struct tb *tb, struct tb_switch *sw);
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int tb_domain_disconnect_pcie_paths(struct tb *tb);
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static inline void tb_domain_put(struct tb *tb)
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{
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put_device(&tb->dev);
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}
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struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,
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u64 route);
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struct tb_switch *tb_switch_alloc_safe_mode(struct tb *tb,
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struct device *parent, u64 route);
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int tb_switch_configure(struct tb_switch *sw);
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int tb_switch_add(struct tb_switch *sw);
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void tb_switch_remove(struct tb_switch *sw);
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void tb_switch_suspend(struct tb_switch *sw);
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int tb_switch_resume(struct tb_switch *sw);
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int tb_switch_reset(struct tb *tb, u64 route);
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void tb_sw_set_unplugged(struct tb_switch *sw);
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struct tb_switch *get_switch_at_route(struct tb_switch *sw, u64 route);
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struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link,
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u8 depth);
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struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_be *uuid);
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static inline unsigned int tb_switch_phy_port_from_link(unsigned int link)
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{
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return (link - 1) / TB_SWITCH_LINKS_PER_PHY_PORT;
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}
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static inline void tb_switch_put(struct tb_switch *sw)
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{
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put_device(&sw->dev);
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}
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static inline bool tb_is_switch(const struct device *dev)
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{
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return dev->type == &tb_switch_type;
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}
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static inline struct tb_switch *tb_to_switch(struct device *dev)
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{
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if (tb_is_switch(dev))
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return container_of(dev, struct tb_switch, dev);
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return NULL;
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}
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int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged);
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int tb_port_add_nfc_credits(struct tb_port *port, int credits);
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int tb_port_clear_counter(struct tb_port *port, int counter);
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int tb_switch_find_vse_cap(struct tb_switch *sw, enum tb_switch_vse_cap vsec);
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int tb_port_find_cap(struct tb_port *port, enum tb_port_cap cap);
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struct tb_path *tb_path_alloc(struct tb *tb, int num_hops);
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void tb_path_free(struct tb_path *path);
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int tb_path_activate(struct tb_path *path);
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void tb_path_deactivate(struct tb_path *path);
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bool tb_path_is_invalid(struct tb_path *path);
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int tb_drom_read(struct tb_switch *sw);
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int tb_drom_read_uid_only(struct tb_switch *sw, u64 *uid);
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static inline int tb_route_length(u64 route)
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{
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return (fls64(route) + TB_ROUTE_SHIFT - 1) / TB_ROUTE_SHIFT;
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}
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static inline bool tb_is_upstream_port(struct tb_port *port)
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{
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return port == tb_upstream_port(port->sw);
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}
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/**
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* tb_downstream_route() - get route to downstream switch
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*
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* Port must not be the upstream port (otherwise a loop is created).
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*
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* Return: Returns a route to the switch behind @port.
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*/
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static inline u64 tb_downstream_route(struct tb_port *port)
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{
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return tb_route(port->sw)
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| ((u64) port->port << (port->sw->config.depth * 8));
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}
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#endif
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