3 * Copyright (C) 2010 - 2013 UNISYS CORPORATION
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
14 * NON INFRINGEMENT. See the GNU General Public License for more
19 * This header file is to be included by other kernel mode components that
20 * implement a particular kind of visor_device. Each of these other kernel
21 * mode components is called a visor device driver. Refer to visortemplate
22 * for a minimal sample visor device driver.
24 * There should be nothing in this file that is private to the visorbus
25 * bus implementation itself.
29 #ifndef __VISORBUS_H__
30 #define __VISORBUS_H__
32 #include <linux/device.h>
33 #include <linux/module.h>
34 #include <linux/poll.h>
35 #include <linux/kernel.h>
36 #include <linux/uuid.h>
38 #include "periodic_work.h"
43 extern struct bus_type visorbus_type;
45 typedef void (*visorbus_state_complete_func) (struct visor_device *dev,
47 struct visorchipset_state {
52 /* Add new fields above. */
53 /* Remaining bits in this 32-bit word are unused. */
56 /** This struct describes a specific Supervisor channel, by providing its
57 * GUID, name, and sizes.
59 struct visor_channeltype_descriptor {
62 unsigned long min_size;
63 unsigned long max_size;
66 /** Information provided by each visor driver when it registers with the
73 const char *build_date;
74 const char *build_time;
77 /** Types of channels handled by this driver, ending with 0 GUID.
78 * Our specialized BUS.match() method knows about this list, and
79 * uses it to determine whether this driver will in fact handle a
80 * new device that it has detected.
82 struct visor_channeltype_descriptor *channel_types;
84 /** Called when a new device comes online, by our probe() function
85 * specified by driver.probe() (triggered ultimately by some call
86 * to driver_register() / bus_add_driver() / driver_attach()).
88 int (*probe)(struct visor_device *dev);
90 /** Called when a new device is removed, by our remove() function
91 * specified by driver.remove() (triggered ultimately by some call
92 * to device_release_driver()).
94 void (*remove)(struct visor_device *dev);
96 /** Called periodically, whenever there is a possibility that
97 * "something interesting" may have happened to the channel state.
99 void (*channel_interrupt)(struct visor_device *dev);
101 /** Called to initiate a change of the device's state. If the return
102 * valu`e is < 0, there was an error and the state transition will NOT
103 * occur. If the return value is >= 0, then the state transition was
104 * INITIATED successfully, and complete_func() will be called (or was
105 * just called) with the final status when either the state transition
106 * fails or completes successfully.
108 int (*pause)(struct visor_device *dev,
109 visorbus_state_complete_func complete_func);
110 int (*resume)(struct visor_device *dev,
111 visorbus_state_complete_func complete_func);
113 /** These fields are for private use by the bus driver only. */
114 struct device_driver driver;
115 struct driver_attribute version_attr;
118 #define to_visor_driver(x) container_of(x, struct visor_driver, driver)
120 /** A device type for things "plugged" into the visorbus bus */
122 struct visor_device {
123 /** visor driver can use the visorchannel member with the functions
124 * defined in visorchannel.h to access the channel
126 struct visorchannel *visorchannel;
127 uuid_le channel_type_guid;
130 /** These fields are for private use by the bus driver only.
131 * A notable exception is that the visor driver can use
132 * visor_get_drvdata() and visor_set_drvdata() to retrieve or stash
133 * private visor driver specific data within the device member.
135 struct device device;
136 struct list_head list_all;
137 struct periodic_work *periodic_work;
139 bool responded_to_device_create;
140 struct kobject kobjdevmajorminor; /* visorbus<x>/dev<y>/devmajorminor/*/
143 void *attr; /* private use by devmajorminor_attr.c you can
144 * change this constant to whatever you
147 /* the code will detect and behave appropriately) */
148 struct semaphore visordriver_callback_lock;
151 unsigned long chipset_bus_no;
152 unsigned long chipset_dev_no;
153 struct visorchipset_state state;
158 struct controlvm_message_header *pending_msg_hdr;
161 u32 internal_port_no;
162 uuid_le partition_uuid;
165 #define to_visor_device(x) container_of(x, struct visor_device, device)
167 #ifndef STANDALONE_CLIENT
168 int visorbus_register_visor_driver(struct visor_driver *);
169 void visorbus_unregister_visor_driver(struct visor_driver *);
170 int visorbus_read_channel(struct visor_device *dev,
171 unsigned long offset, void *dest,
172 unsigned long nbytes);
173 int visorbus_write_channel(struct visor_device *dev,
174 unsigned long offset, void *src,
175 unsigned long nbytes);
176 int visorbus_clear_channel(struct visor_device *dev,
177 unsigned long offset, u8 ch, unsigned long nbytes);
178 int visorbus_registerdevnode(struct visor_device *dev,
179 const char *name, int major, int minor);
180 void visorbus_enable_channel_interrupts(struct visor_device *dev);
181 void visorbus_disable_channel_interrupts(struct visor_device *dev);
184 /* Note that for visorchannel_create()
185 * <channel_bytes> and <guid> arguments may be 0 if we are a channel CLIENT.
186 * In this case, the values can simply be read from the channel header.
188 struct visorchannel *visorchannel_create(u64 physaddr,
189 unsigned long channel_bytes,
190 gfp_t gfp, uuid_le guid);
191 struct visorchannel *visorchannel_create_with_lock(u64 physaddr,
192 unsigned long channel_bytes,
193 gfp_t gfp, uuid_le guid);
194 void visorchannel_destroy(struct visorchannel *channel);
195 int visorchannel_read(struct visorchannel *channel, ulong offset,
196 void *local, ulong nbytes);
197 int visorchannel_write(struct visorchannel *channel, ulong offset,
198 void *local, ulong nbytes);
199 int visorchannel_clear(struct visorchannel *channel, ulong offset,
200 u8 ch, ulong nbytes);
201 bool visorchannel_signalremove(struct visorchannel *channel, u32 queue,
203 bool visorchannel_signalinsert(struct visorchannel *channel, u32 queue,
205 int visorchannel_signalqueue_slots_avail(struct visorchannel *channel,
207 int visorchannel_signalqueue_max_slots(struct visorchannel *channel, u32 queue);
208 u64 visorchannel_get_physaddr(struct visorchannel *channel);
209 ulong visorchannel_get_nbytes(struct visorchannel *channel);
210 char *visorchannel_id(struct visorchannel *channel, char *s);
211 char *visorchannel_zoneid(struct visorchannel *channel, char *s);
212 u64 visorchannel_get_clientpartition(struct visorchannel *channel);
213 uuid_le visorchannel_get_uuid(struct visorchannel *channel);
214 char *visorchannel_uuid_id(uuid_le *guid, char *s);
215 void visorchannel_debug(struct visorchannel *channel, int num_queues,
216 struct seq_file *seq, u32 off);
217 void __iomem *visorchannel_get_header(struct visorchannel *channel);