Commit 259307074bfcf1ff88016e12c68f057aee6cb694
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99ab32f3b5
Exists in
ti-lsk-linux-4.1.y
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ipmi: Add SMBus interface driver (SSIF)
This patch adds the SMBus interface to the IPMI driver. Signed-off-by: Corey Minyard <minyard@acm.org> Documentation/IPMI.txt | 32 drivers/char/ipmi/Kconfig | 11 drivers/char/ipmi/Makefile | 1 drivers/char/ipmi/ipmi_smb.c | 1737 +++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 1769 insertions(+), 12 deletions(-)
Showing 4 changed files with 1950 additions and 3 deletions Side-by-side Diff
Documentation/IPMI.txt
... | ... | @@ -42,7 +42,13 @@ |
42 | 42 | properly provides the SMBIOS info for IPMI, the driver will detect it |
43 | 43 | and just work. If you have a board with a standard interface (These |
44 | 44 | will generally be either "KCS", "SMIC", or "BT", consult your hardware |
45 | -manual), choose the 'IPMI SI handler' option. | |
45 | +manual), choose the 'IPMI SI handler' option. A driver also exists | |
46 | +for direct I2C access to the IPMI management controller. Some boards | |
47 | +support this, but it is unknown if it will work on every board. For | |
48 | +this, choose 'IPMI SMBus handler', but be ready to try to do some | |
49 | +figuring to see if it will work on your system if the SMBIOS/APCI | |
50 | +information is wrong or not present. It is fairly safe to have both | |
51 | +these enabled and let the drivers auto-detect what is present. | |
46 | 52 | |
47 | 53 | You should generally enable ACPI on your system, as systems with IPMI |
48 | 54 | can have ACPI tables describing them. |
... | ... | @@ -52,7 +58,8 @@ |
52 | 58 | detected (via ACPI or SMBIOS tables) and should just work. Sadly, |
53 | 59 | many boards do not have this information. The driver attempts |
54 | 60 | standard defaults, but they may not work. If you fall into this |
55 | -situation, you need to read the section below named 'The SI Driver'. | |
61 | +situation, you need to read the section below named 'The SI Driver' or | |
62 | +"The SMBus Driver" on how to hand-configure your system. | |
56 | 63 | |
57 | 64 | IPMI defines a standard watchdog timer. You can enable this with the |
58 | 65 | 'IPMI Watchdog Timer' config option. If you compile the driver into |
59 | 66 | |
... | ... | @@ -97,8 +104,13 @@ |
97 | 104 | as an IPMI user. |
98 | 105 | |
99 | 106 | ipmi_si - A driver for various system interfaces. This supports KCS, |
100 | -SMIC, and BT interfaces. | |
107 | +SMIC, and BT interfaces. Unless you have an SMBus interface or your | |
108 | +own custom interface, you probably need to use this. | |
101 | 109 | |
110 | +ipmi_ssif - A driver for accessing BMCs on the SMBus. It uses the | |
111 | +I2C kernel driver's SMBus interfaces to send and receive IPMI messages | |
112 | +over the SMBus. | |
113 | + | |
102 | 114 | ipmi_watchdog - IPMI requires systems to have a very capable watchdog |
103 | 115 | timer. This driver implements the standard Linux watchdog timer |
104 | 116 | interface on top of the IPMI message handler. |
... | ... | @@ -476,6 +488,62 @@ |
476 | 488 | only the first three parameters (si type, address type, and address) |
477 | 489 | are used for the comparison. Any options are ignored for removing. |
478 | 490 | |
491 | +The SMBus Driver (SSIF) | |
492 | +----------------------- | |
493 | + | |
494 | +The SMBus driver allows up to 4 SMBus devices to be configured in the | |
495 | +system. By default, the driver will only register with something it | |
496 | +finds in DMI or ACPI tables. You can change this | |
497 | +at module load time (for a module) with: | |
498 | + | |
499 | + modprobe ipmi_ssif.o | |
500 | + addr=<i2caddr1>[,<i2caddr2>[,...]] | |
501 | + adapter=<adapter1>[,<adapter2>[...]] | |
502 | + dbg=<flags1>,<flags2>... | |
503 | + slave_addrs=<addr1>,<addr2>,... | |
504 | + [dbg_probe=1] | |
505 | + | |
506 | +The addresses are normal I2C addresses. The adapter is the string | |
507 | +name of the adapter, as shown in /sys/class/i2c-adapter/i2c-<n>/name. | |
508 | +It is *NOT* i2c-<n> itself. | |
509 | + | |
510 | +The debug flags are bit flags for each BMC found, they are: | |
511 | +IPMI messages: 1, driver state: 2, timing: 4, I2C probe: 8 | |
512 | + | |
513 | +Setting dbg_probe to 1 will enable debugging of the probing and | |
514 | +detection process for BMCs on the SMBusses. | |
515 | + | |
516 | +The slave_addrs specifies the IPMI address of the local BMC. This is | |
517 | +usually 0x20 and the driver defaults to that, but in case it's not, it | |
518 | +can be specified when the driver starts up. | |
519 | + | |
520 | +Discovering the IPMI compliant BMC on the SMBus can cause devices on | |
521 | +the I2C bus to fail. The SMBus driver writes a "Get Device ID" IPMI | |
522 | +message as a block write to the I2C bus and waits for a response. | |
523 | +This action can be detrimental to some I2C devices. It is highly | |
524 | +recommended that the known I2C address be given to the SMBus driver in | |
525 | +the smb_addr parameter unless you have DMI or ACPI data to tell the | |
526 | +driver what to use. | |
527 | + | |
528 | +When compiled into the kernel, the addresses can be specified on the | |
529 | +kernel command line as: | |
530 | + | |
531 | + ipmb_ssif.addr=<i2caddr1>[,<i2caddr2>[...]] | |
532 | + ipmi_ssif.adapter=<adapter1>[,<adapter2>[...]] | |
533 | + ipmi_ssif.dbg=<flags1>[,<flags2>[...]] | |
534 | + ipmi_ssif.dbg_probe=1 | |
535 | + ipmi_ssif.slave_addrs=<addr1>[,<addr2>[...]] | |
536 | + | |
537 | +These are the same options as on the module command line. | |
538 | + | |
539 | +The I2C driver does not support non-blocking access or polling, so | |
540 | +this driver cannod to IPMI panic events, extend the watchdog at panic | |
541 | +time, or other panic-related IPMI functions without special kernel | |
542 | +patches and driver modifications. You can get those at the openipmi | |
543 | +web page. | |
544 | + | |
545 | +The driver supports a hot add and remove of interfaces through the I2C | |
546 | +sysfs interface. | |
479 | 547 | |
480 | 548 | Other Pieces |
481 | 549 | ------------ |
drivers/char/ipmi/Kconfig
... | ... | @@ -62,6 +62,14 @@ |
62 | 62 | only be available on older systems if the "ipmi_si_intf.trydefaults=1" |
63 | 63 | boot argument is passed. |
64 | 64 | |
65 | +config IPMI_SSIF | |
66 | + tristate 'IPMI SMBus handler (SSIF)' | |
67 | + select I2C | |
68 | + help | |
69 | + Provides a driver for a SMBus interface to a BMC, meaning that you | |
70 | + have a driver that must be accessed over an I2C bus instead of a | |
71 | + standard interface. This module requires I2C support. | |
72 | + | |
65 | 73 | config IPMI_WATCHDOG |
66 | 74 | tristate 'IPMI Watchdog Timer' |
67 | 75 | help |
drivers/char/ipmi/Makefile
... | ... | @@ -7,6 +7,7 @@ |
7 | 7 | obj-$(CONFIG_IPMI_HANDLER) += ipmi_msghandler.o |
8 | 8 | obj-$(CONFIG_IPMI_DEVICE_INTERFACE) += ipmi_devintf.o |
9 | 9 | obj-$(CONFIG_IPMI_SI) += ipmi_si.o |
10 | +obj-$(CONFIG_IPMI_SSIF) += ipmi_ssif.o | |
10 | 11 | obj-$(CONFIG_IPMI_WATCHDOG) += ipmi_watchdog.o |
11 | 12 | obj-$(CONFIG_IPMI_POWEROFF) += ipmi_poweroff.o |
drivers/char/ipmi/ipmi_ssif.c
Changes suppressed. Click to show
1 | +/* | |
2 | + * ipmi_ssif.c | |
3 | + * | |
4 | + * The interface to the IPMI driver for SMBus access to a SMBus | |
5 | + * compliant device. Called SSIF by the IPMI spec. | |
6 | + * | |
7 | + * Author: Intel Corporation | |
8 | + * Todd Davis <todd.c.davis@intel.com> | |
9 | + * | |
10 | + * Rewritten by Corey Minyard <minyard@acm.org> to support the | |
11 | + * non-blocking I2C interface, add support for multi-part | |
12 | + * transactions, add PEC support, and general clenaup. | |
13 | + * | |
14 | + * Copyright 2003 Intel Corporation | |
15 | + * Copyright 2005 MontaVista Software | |
16 | + * | |
17 | + * This program is free software; you can redistribute it and/or modify it | |
18 | + * under the terms of the GNU General Public License as published by the | |
19 | + * Free Software Foundation; either version 2 of the License, or (at your | |
20 | + * option) any later version. | |
21 | + */ | |
22 | + | |
23 | +/* | |
24 | + * This file holds the "policy" for the interface to the SSIF state | |
25 | + * machine. It does the configuration, handles timers and interrupts, | |
26 | + * and drives the real SSIF state machine. | |
27 | + */ | |
28 | + | |
29 | +/* | |
30 | + * TODO: Figure out how to use SMB alerts. This will require a new | |
31 | + * interface into the I2C driver, I believe. | |
32 | + */ | |
33 | + | |
34 | +#include <linux/version.h> | |
35 | +#if defined(MODVERSIONS) | |
36 | +#include <linux/modversions.h> | |
37 | +#endif | |
38 | + | |
39 | +#include <linux/module.h> | |
40 | +#include <linux/moduleparam.h> | |
41 | +#include <linux/sched.h> | |
42 | +#include <linux/seq_file.h> | |
43 | +#include <linux/timer.h> | |
44 | +#include <linux/delay.h> | |
45 | +#include <linux/errno.h> | |
46 | +#include <linux/spinlock.h> | |
47 | +#include <linux/slab.h> | |
48 | +#include <linux/list.h> | |
49 | +#include <linux/i2c.h> | |
50 | +#include <linux/ipmi_smi.h> | |
51 | +#include <linux/init.h> | |
52 | +#include <linux/dmi.h> | |
53 | +#include <linux/kthread.h> | |
54 | +#include <linux/acpi.h> | |
55 | + | |
56 | +#define PFX "ipmi_ssif: " | |
57 | +#define DEVICE_NAME "ipmi_ssif" | |
58 | + | |
59 | +#define IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD 0x57 | |
60 | + | |
61 | +#define SSIF_IPMI_REQUEST 2 | |
62 | +#define SSIF_IPMI_MULTI_PART_REQUEST_START 6 | |
63 | +#define SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE 7 | |
64 | +#define SSIF_IPMI_RESPONSE 3 | |
65 | +#define SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE 9 | |
66 | + | |
67 | +/* ssif_debug is a bit-field | |
68 | + * SSIF_DEBUG_MSG - commands and their responses | |
69 | + * SSIF_DEBUG_STATES - message states | |
70 | + * SSIF_DEBUG_TIMING - Measure times between events in the driver | |
71 | + */ | |
72 | +#define SSIF_DEBUG_TIMING 4 | |
73 | +#define SSIF_DEBUG_STATE 2 | |
74 | +#define SSIF_DEBUG_MSG 1 | |
75 | +#define SSIF_NODEBUG 0 | |
76 | +#define SSIF_DEFAULT_DEBUG (SSIF_NODEBUG) | |
77 | + | |
78 | +/* | |
79 | + * Timer values | |
80 | + */ | |
81 | +#define SSIF_MSG_USEC 20000 /* 20ms between message tries. */ | |
82 | +#define SSIF_MSG_PART_USEC 5000 /* 5ms for a message part */ | |
83 | + | |
84 | +/* How many times to we retry sending/receiving the message. */ | |
85 | +#define SSIF_SEND_RETRIES 5 | |
86 | +#define SSIF_RECV_RETRIES 250 | |
87 | + | |
88 | +#define SSIF_MSG_MSEC (SSIF_MSG_USEC / 1000) | |
89 | +#define SSIF_MSG_JIFFIES ((SSIF_MSG_USEC * 1000) / TICK_NSEC) | |
90 | +#define SSIF_MSG_PART_JIFFIES ((SSIF_MSG_PART_USEC * 1000) / TICK_NSEC) | |
91 | + | |
92 | +enum ssif_intf_state { | |
93 | + SSIF_NORMAL, | |
94 | + SSIF_GETTING_FLAGS, | |
95 | + SSIF_GETTING_EVENTS, | |
96 | + SSIF_CLEARING_FLAGS, | |
97 | + SSIF_GETTING_MESSAGES, | |
98 | + /* FIXME - add watchdog stuff. */ | |
99 | +}; | |
100 | + | |
101 | +#define SSIF_IDLE(ssif) ((ssif)->ssif_state == SSIF_NORMAL \ | |
102 | + && (ssif)->curr_msg == NULL) | |
103 | + | |
104 | +/* | |
105 | + * Indexes into stats[] in ssif_info below. | |
106 | + */ | |
107 | +enum ssif_stat_indexes { | |
108 | + /* Number of total messages sent. */ | |
109 | + SSIF_STAT_sent_messages = 0, | |
110 | + | |
111 | + /* | |
112 | + * Number of message parts sent. Messages may be broken into | |
113 | + * parts if they are long. | |
114 | + */ | |
115 | + SSIF_STAT_sent_messages_parts, | |
116 | + | |
117 | + /* | |
118 | + * Number of time a message was retried. | |
119 | + */ | |
120 | + SSIF_STAT_send_retries, | |
121 | + | |
122 | + /* | |
123 | + * Number of times the send of a message failed. | |
124 | + */ | |
125 | + SSIF_STAT_send_errors, | |
126 | + | |
127 | + /* | |
128 | + * Number of message responses received. | |
129 | + */ | |
130 | + SSIF_STAT_received_messages, | |
131 | + | |
132 | + /* | |
133 | + * Number of message fragments received. | |
134 | + */ | |
135 | + SSIF_STAT_received_message_parts, | |
136 | + | |
137 | + /* | |
138 | + * Number of times the receive of a message was retried. | |
139 | + */ | |
140 | + SSIF_STAT_receive_retries, | |
141 | + | |
142 | + /* | |
143 | + * Number of errors receiving messages. | |
144 | + */ | |
145 | + SSIF_STAT_receive_errors, | |
146 | + | |
147 | + /* | |
148 | + * Number of times a flag fetch was requested. | |
149 | + */ | |
150 | + SSIF_STAT_flag_fetches, | |
151 | + | |
152 | + /* | |
153 | + * Number of times the hardware didn't follow the state machine. | |
154 | + */ | |
155 | + SSIF_STAT_hosed, | |
156 | + | |
157 | + /* | |
158 | + * Number of received events. | |
159 | + */ | |
160 | + SSIF_STAT_events, | |
161 | + | |
162 | + /* Number of asyncronous messages received. */ | |
163 | + SSIF_STAT_incoming_messages, | |
164 | + | |
165 | + /* Number of watchdog pretimeouts. */ | |
166 | + SSIF_STAT_watchdog_pretimeouts, | |
167 | + | |
168 | + /* Always add statistics before this value, it must be last. */ | |
169 | + SSIF_NUM_STATS | |
170 | +}; | |
171 | + | |
172 | +struct ssif_addr_info { | |
173 | + unsigned short addr; | |
174 | + struct i2c_board_info binfo; | |
175 | + char *adapter_name; | |
176 | + int debug; | |
177 | + int slave_addr; | |
178 | + enum ipmi_addr_src addr_src; | |
179 | + union ipmi_smi_info_union addr_info; | |
180 | + | |
181 | + struct mutex clients_mutex; | |
182 | + struct list_head clients; | |
183 | + | |
184 | + struct list_head link; | |
185 | +}; | |
186 | + | |
187 | +struct ssif_info; | |
188 | + | |
189 | +typedef void (*ssif_i2c_done)(struct ssif_info *ssif_info, int result, | |
190 | + unsigned char *data, unsigned int len); | |
191 | + | |
192 | +struct ssif_info { | |
193 | + ipmi_smi_t intf; | |
194 | + int intf_num; | |
195 | + spinlock_t lock; | |
196 | + struct ipmi_smi_msg *waiting_msg; | |
197 | + struct ipmi_smi_msg *curr_msg; | |
198 | + enum ssif_intf_state ssif_state; | |
199 | + unsigned long ssif_debug; | |
200 | + | |
201 | + struct ipmi_smi_handlers handlers; | |
202 | + | |
203 | + enum ipmi_addr_src addr_source; /* ACPI, PCI, SMBIOS, hardcode, etc. */ | |
204 | + union ipmi_smi_info_union addr_info; | |
205 | + | |
206 | + /* | |
207 | + * Flags from the last GET_MSG_FLAGS command, used when an ATTN | |
208 | + * is set to hold the flags until we are done handling everything | |
209 | + * from the flags. | |
210 | + */ | |
211 | +#define RECEIVE_MSG_AVAIL 0x01 | |
212 | +#define EVENT_MSG_BUFFER_FULL 0x02 | |
213 | +#define WDT_PRE_TIMEOUT_INT 0x08 | |
214 | + unsigned char msg_flags; | |
215 | + | |
216 | + bool has_event_buffer; | |
217 | + | |
218 | + /* | |
219 | + * If set to true, this will request events the next time the | |
220 | + * state machine is idle. | |
221 | + */ | |
222 | + bool req_events; | |
223 | + | |
224 | + /* | |
225 | + * If set to true, this will request flags the next time the | |
226 | + * state machine is idle. | |
227 | + */ | |
228 | + bool req_flags; | |
229 | + | |
230 | + /* | |
231 | + * Used to perform timer operations when run-to-completion | |
232 | + * mode is on. This is a countdown timer. | |
233 | + */ | |
234 | + int rtc_us_timer; | |
235 | + | |
236 | + /* Used for sending/receiving data. +1 for the length. */ | |
237 | + unsigned char data[IPMI_MAX_MSG_LENGTH + 1]; | |
238 | + unsigned int data_len; | |
239 | + | |
240 | + /* Temp receive buffer, gets copied into data. */ | |
241 | + unsigned char recv[I2C_SMBUS_BLOCK_MAX]; | |
242 | + | |
243 | + struct i2c_client *client; | |
244 | + ssif_i2c_done done_handler; | |
245 | + | |
246 | + /* Thread interface handling */ | |
247 | + struct task_struct *thread; | |
248 | + struct completion wake_thread; | |
249 | + bool stopping; | |
250 | + int i2c_read_write; | |
251 | + int i2c_command; | |
252 | + unsigned char *i2c_data; | |
253 | + unsigned int i2c_size; | |
254 | + | |
255 | + /* From the device id response. */ | |
256 | + struct ipmi_device_id device_id; | |
257 | + | |
258 | + struct timer_list retry_timer; | |
259 | + int retries_left; | |
260 | + | |
261 | + /* Info from SSIF cmd */ | |
262 | + unsigned char max_xmit_msg_size; | |
263 | + unsigned char max_recv_msg_size; | |
264 | + unsigned int multi_support; | |
265 | + int supports_pec; | |
266 | + | |
267 | +#define SSIF_NO_MULTI 0 | |
268 | +#define SSIF_MULTI_2_PART 1 | |
269 | +#define SSIF_MULTI_n_PART 2 | |
270 | + unsigned char *multi_data; | |
271 | + unsigned int multi_len; | |
272 | + unsigned int multi_pos; | |
273 | + | |
274 | + atomic_t stats[SSIF_NUM_STATS]; | |
275 | +}; | |
276 | + | |
277 | +#define ssif_inc_stat(ssif, stat) \ | |
278 | + atomic_inc(&(ssif)->stats[SSIF_STAT_ ## stat]) | |
279 | +#define ssif_get_stat(ssif, stat) \ | |
280 | + ((unsigned int) atomic_read(&(ssif)->stats[SSIF_STAT_ ## stat])) | |
281 | + | |
282 | +static bool initialized; | |
283 | + | |
284 | +static atomic_t next_intf = ATOMIC_INIT(0); | |
285 | + | |
286 | +static void return_hosed_msg(struct ssif_info *ssif_info, | |
287 | + struct ipmi_smi_msg *msg); | |
288 | +static void start_next_msg(struct ssif_info *ssif_info, unsigned long *flags); | |
289 | +static int start_send(struct ssif_info *ssif_info, | |
290 | + unsigned char *data, | |
291 | + unsigned int len); | |
292 | + | |
293 | +static unsigned long *ipmi_ssif_lock_cond(struct ssif_info *ssif_info, | |
294 | + unsigned long *flags) | |
295 | +{ | |
296 | + spin_lock_irqsave(&ssif_info->lock, *flags); | |
297 | + return flags; | |
298 | +} | |
299 | + | |
300 | +static void ipmi_ssif_unlock_cond(struct ssif_info *ssif_info, | |
301 | + unsigned long *flags) | |
302 | +{ | |
303 | + spin_unlock_irqrestore(&ssif_info->lock, *flags); | |
304 | +} | |
305 | + | |
306 | +static void deliver_recv_msg(struct ssif_info *ssif_info, | |
307 | + struct ipmi_smi_msg *msg) | |
308 | +{ | |
309 | + ipmi_smi_t intf = ssif_info->intf; | |
310 | + | |
311 | + if (!intf) { | |
312 | + ipmi_free_smi_msg(msg); | |
313 | + } else if (msg->rsp_size < 0) { | |
314 | + return_hosed_msg(ssif_info, msg); | |
315 | + pr_err(PFX | |
316 | + "Malformed message in deliver_recv_msg: rsp_size = %d\n", | |
317 | + msg->rsp_size); | |
318 | + } else { | |
319 | + ipmi_smi_msg_received(intf, msg); | |
320 | + } | |
321 | +} | |
322 | + | |
323 | +static void return_hosed_msg(struct ssif_info *ssif_info, | |
324 | + struct ipmi_smi_msg *msg) | |
325 | +{ | |
326 | + ssif_inc_stat(ssif_info, hosed); | |
327 | + | |
328 | + /* Make it a response */ | |
329 | + msg->rsp[0] = msg->data[0] | 4; | |
330 | + msg->rsp[1] = msg->data[1]; | |
331 | + msg->rsp[2] = 0xFF; /* Unknown error. */ | |
332 | + msg->rsp_size = 3; | |
333 | + | |
334 | + deliver_recv_msg(ssif_info, msg); | |
335 | +} | |
336 | + | |
337 | +/* | |
338 | + * Must be called with the message lock held. This will release the | |
339 | + * message lock. Note that the caller will check SSIF_IDLE and start a | |
340 | + * new operation, so there is no need to check for new messages to | |
341 | + * start in here. | |
342 | + */ | |
343 | +static void start_clear_flags(struct ssif_info *ssif_info, unsigned long *flags) | |
344 | +{ | |
345 | + unsigned char msg[3]; | |
346 | + | |
347 | + ssif_info->msg_flags &= ~WDT_PRE_TIMEOUT_INT; | |
348 | + ssif_info->ssif_state = SSIF_CLEARING_FLAGS; | |
349 | + ipmi_ssif_unlock_cond(ssif_info, flags); | |
350 | + | |
351 | + /* Make sure the watchdog pre-timeout flag is not set at startup. */ | |
352 | + msg[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
353 | + msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD; | |
354 | + msg[2] = WDT_PRE_TIMEOUT_INT; | |
355 | + | |
356 | + if (start_send(ssif_info, msg, 3) != 0) { | |
357 | + /* Error, just go to normal state. */ | |
358 | + ssif_info->ssif_state = SSIF_NORMAL; | |
359 | + } | |
360 | +} | |
361 | + | |
362 | +static void start_flag_fetch(struct ssif_info *ssif_info, unsigned long *flags) | |
363 | +{ | |
364 | + unsigned char mb[2]; | |
365 | + | |
366 | + ssif_info->req_flags = false; | |
367 | + ssif_info->ssif_state = SSIF_GETTING_FLAGS; | |
368 | + ipmi_ssif_unlock_cond(ssif_info, flags); | |
369 | + | |
370 | + mb[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
371 | + mb[1] = IPMI_GET_MSG_FLAGS_CMD; | |
372 | + if (start_send(ssif_info, mb, 2) != 0) | |
373 | + ssif_info->ssif_state = SSIF_NORMAL; | |
374 | +} | |
375 | + | |
376 | +static void check_start_send(struct ssif_info *ssif_info, unsigned long *flags, | |
377 | + struct ipmi_smi_msg *msg) | |
378 | +{ | |
379 | + if (start_send(ssif_info, msg->data, msg->data_size) != 0) { | |
380 | + unsigned long oflags; | |
381 | + | |
382 | + flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
383 | + ssif_info->curr_msg = NULL; | |
384 | + ssif_info->ssif_state = SSIF_NORMAL; | |
385 | + ipmi_ssif_unlock_cond(ssif_info, flags); | |
386 | + ipmi_free_smi_msg(msg); | |
387 | + } | |
388 | +} | |
389 | + | |
390 | +static void start_event_fetch(struct ssif_info *ssif_info, unsigned long *flags) | |
391 | +{ | |
392 | + struct ipmi_smi_msg *msg; | |
393 | + | |
394 | + ssif_info->req_events = false; | |
395 | + | |
396 | + msg = ipmi_alloc_smi_msg(); | |
397 | + if (!msg) { | |
398 | + ssif_info->ssif_state = SSIF_NORMAL; | |
399 | + return; | |
400 | + } | |
401 | + | |
402 | + ssif_info->curr_msg = msg; | |
403 | + ssif_info->ssif_state = SSIF_GETTING_EVENTS; | |
404 | + ipmi_ssif_unlock_cond(ssif_info, flags); | |
405 | + | |
406 | + msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
407 | + msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD; | |
408 | + msg->data_size = 2; | |
409 | + | |
410 | + check_start_send(ssif_info, flags, msg); | |
411 | +} | |
412 | + | |
413 | +static void start_recv_msg_fetch(struct ssif_info *ssif_info, | |
414 | + unsigned long *flags) | |
415 | +{ | |
416 | + struct ipmi_smi_msg *msg; | |
417 | + | |
418 | + msg = ipmi_alloc_smi_msg(); | |
419 | + if (!msg) { | |
420 | + ssif_info->ssif_state = SSIF_NORMAL; | |
421 | + return; | |
422 | + } | |
423 | + | |
424 | + ssif_info->curr_msg = msg; | |
425 | + ssif_info->ssif_state = SSIF_GETTING_MESSAGES; | |
426 | + ipmi_ssif_unlock_cond(ssif_info, flags); | |
427 | + | |
428 | + msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
429 | + msg->data[1] = IPMI_GET_MSG_CMD; | |
430 | + msg->data_size = 2; | |
431 | + | |
432 | + check_start_send(ssif_info, flags, msg); | |
433 | +} | |
434 | + | |
435 | +/* | |
436 | + * Must be called with the message lock held. This will release the | |
437 | + * message lock. Note that the caller will check SSIF_IDLE and start a | |
438 | + * new operation, so there is no need to check for new messages to | |
439 | + * start in here. | |
440 | + */ | |
441 | +static void handle_flags(struct ssif_info *ssif_info, unsigned long *flags) | |
442 | +{ | |
443 | + if (ssif_info->msg_flags & WDT_PRE_TIMEOUT_INT) { | |
444 | + ipmi_smi_t intf = ssif_info->intf; | |
445 | + /* Watchdog pre-timeout */ | |
446 | + ssif_inc_stat(ssif_info, watchdog_pretimeouts); | |
447 | + start_clear_flags(ssif_info, flags); | |
448 | + if (intf) | |
449 | + ipmi_smi_watchdog_pretimeout(intf); | |
450 | + } else if (ssif_info->msg_flags & RECEIVE_MSG_AVAIL) | |
451 | + /* Messages available. */ | |
452 | + start_recv_msg_fetch(ssif_info, flags); | |
453 | + else if (ssif_info->msg_flags & EVENT_MSG_BUFFER_FULL) | |
454 | + /* Events available. */ | |
455 | + start_event_fetch(ssif_info, flags); | |
456 | + else { | |
457 | + ssif_info->ssif_state = SSIF_NORMAL; | |
458 | + ipmi_ssif_unlock_cond(ssif_info, flags); | |
459 | + } | |
460 | +} | |
461 | + | |
462 | +static int ipmi_ssif_thread(void *data) | |
463 | +{ | |
464 | + struct ssif_info *ssif_info = data; | |
465 | + | |
466 | + while (!kthread_should_stop()) { | |
467 | + int result; | |
468 | + | |
469 | + /* Wait for something to do */ | |
470 | + wait_for_completion(&ssif_info->wake_thread); | |
471 | + init_completion(&ssif_info->wake_thread); | |
472 | + | |
473 | + if (ssif_info->stopping) | |
474 | + break; | |
475 | + | |
476 | + if (ssif_info->i2c_read_write == I2C_SMBUS_WRITE) { | |
477 | + result = i2c_smbus_write_block_data( | |
478 | + ssif_info->client, SSIF_IPMI_REQUEST, | |
479 | + ssif_info->i2c_data[0], | |
480 | + ssif_info->i2c_data + 1); | |
481 | + ssif_info->done_handler(ssif_info, result, NULL, 0); | |
482 | + } else { | |
483 | + result = i2c_smbus_read_block_data( | |
484 | + ssif_info->client, SSIF_IPMI_RESPONSE, | |
485 | + ssif_info->i2c_data); | |
486 | + if (result < 0) | |
487 | + ssif_info->done_handler(ssif_info, result, | |
488 | + NULL, 0); | |
489 | + else | |
490 | + ssif_info->done_handler(ssif_info, 0, | |
491 | + ssif_info->i2c_data, | |
492 | + result); | |
493 | + } | |
494 | + } | |
495 | + | |
496 | + return 0; | |
497 | +} | |
498 | + | |
499 | +static int ssif_i2c_send(struct ssif_info *ssif_info, | |
500 | + ssif_i2c_done handler, | |
501 | + int read_write, int command, | |
502 | + unsigned char *data, unsigned int size) | |
503 | +{ | |
504 | + ssif_info->done_handler = handler; | |
505 | + | |
506 | + ssif_info->i2c_read_write = read_write; | |
507 | + ssif_info->i2c_command = command; | |
508 | + ssif_info->i2c_data = data; | |
509 | + ssif_info->i2c_size = size; | |
510 | + complete(&ssif_info->wake_thread); | |
511 | + return 0; | |
512 | +} | |
513 | + | |
514 | + | |
515 | +static void msg_done_handler(struct ssif_info *ssif_info, int result, | |
516 | + unsigned char *data, unsigned int len); | |
517 | + | |
518 | +static void retry_timeout(unsigned long data) | |
519 | +{ | |
520 | + struct ssif_info *ssif_info = (void *) data; | |
521 | + int rv; | |
522 | + | |
523 | + if (ssif_info->stopping) | |
524 | + return; | |
525 | + | |
526 | + ssif_info->rtc_us_timer = 0; | |
527 | + | |
528 | + rv = ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ, | |
529 | + SSIF_IPMI_RESPONSE, | |
530 | + ssif_info->recv, I2C_SMBUS_BLOCK_DATA); | |
531 | + if (rv < 0) { | |
532 | + /* request failed, just return the error. */ | |
533 | + if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
534 | + pr_info("Error from i2c_non_blocking_op(5)\n"); | |
535 | + | |
536 | + msg_done_handler(ssif_info, -EIO, NULL, 0); | |
537 | + } | |
538 | +} | |
539 | + | |
540 | +static int start_resend(struct ssif_info *ssif_info); | |
541 | + | |
542 | +static void msg_done_handler(struct ssif_info *ssif_info, int result, | |
543 | + unsigned char *data, unsigned int len) | |
544 | +{ | |
545 | + struct ipmi_smi_msg *msg; | |
546 | + unsigned long oflags, *flags; | |
547 | + int rv; | |
548 | + | |
549 | + /* | |
550 | + * We are single-threaded here, so no need for a lock until we | |
551 | + * start messing with driver states or the queues. | |
552 | + */ | |
553 | + | |
554 | + if (result < 0) { | |
555 | + ssif_info->retries_left--; | |
556 | + if (ssif_info->retries_left > 0) { | |
557 | + ssif_inc_stat(ssif_info, receive_retries); | |
558 | + | |
559 | + mod_timer(&ssif_info->retry_timer, | |
560 | + jiffies + SSIF_MSG_JIFFIES); | |
561 | + ssif_info->rtc_us_timer = SSIF_MSG_USEC; | |
562 | + return; | |
563 | + } | |
564 | + | |
565 | + ssif_inc_stat(ssif_info, receive_errors); | |
566 | + | |
567 | + if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
568 | + pr_info("Error in msg_done_handler: %d\n", result); | |
569 | + len = 0; | |
570 | + goto continue_op; | |
571 | + } | |
572 | + | |
573 | + if ((len > 1) && (ssif_info->multi_pos == 0) | |
574 | + && (data[0] == 0x00) && (data[1] == 0x01)) { | |
575 | + /* Start of multi-part read. Start the next transaction. */ | |
576 | + int i; | |
577 | + | |
578 | + ssif_inc_stat(ssif_info, received_message_parts); | |
579 | + | |
580 | + /* Remove the multi-part read marker. */ | |
581 | + for (i = 0; i < (len-2); i++) | |
582 | + ssif_info->data[i] = data[i+2]; | |
583 | + len -= 2; | |
584 | + ssif_info->multi_len = len; | |
585 | + ssif_info->multi_pos = 1; | |
586 | + | |
587 | + rv = ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ, | |
588 | + SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE, | |
589 | + ssif_info->recv, I2C_SMBUS_BLOCK_DATA); | |
590 | + if (rv < 0) { | |
591 | + if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
592 | + pr_info("Error from i2c_non_blocking_op(1)\n"); | |
593 | + | |
594 | + result = -EIO; | |
595 | + } else | |
596 | + return; | |
597 | + } else if (ssif_info->multi_pos) { | |
598 | + /* Middle of multi-part read. Start the next transaction. */ | |
599 | + int i; | |
600 | + unsigned char blocknum; | |
601 | + | |
602 | + if (len == 0) { | |
603 | + result = -EIO; | |
604 | + if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
605 | + pr_info(PFX "Middle message with no data\n"); | |
606 | + | |
607 | + goto continue_op; | |
608 | + } | |
609 | + | |
610 | + blocknum = data[ssif_info->multi_len]; | |
611 | + | |
612 | + if (ssif_info->multi_len+len-1 > IPMI_MAX_MSG_LENGTH) { | |
613 | + /* Received message too big, abort the operation. */ | |
614 | + result = -E2BIG; | |
615 | + if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
616 | + pr_info("Received message too big\n"); | |
617 | + | |
618 | + goto continue_op; | |
619 | + } | |
620 | + | |
621 | + /* Remove the blocknum from the data. */ | |
622 | + for (i = 0; i < (len-1); i++) | |
623 | + ssif_info->data[i+ssif_info->multi_len] = data[i+1]; | |
624 | + len--; | |
625 | + ssif_info->multi_len += len; | |
626 | + if (blocknum == 0xff) { | |
627 | + /* End of read */ | |
628 | + len = ssif_info->multi_len; | |
629 | + data = ssif_info->data; | |
630 | + } else if ((blocknum+1) != ssif_info->multi_pos) { | |
631 | + /* | |
632 | + * Out of sequence block, just abort. Block | |
633 | + * numbers start at zero for the second block, | |
634 | + * but multi_pos starts at one, so the +1. | |
635 | + */ | |
636 | + result = -EIO; | |
637 | + } else { | |
638 | + ssif_inc_stat(ssif_info, received_message_parts); | |
639 | + | |
640 | + ssif_info->multi_pos++; | |
641 | + | |
642 | + rv = ssif_i2c_send(ssif_info, msg_done_handler, | |
643 | + I2C_SMBUS_READ, | |
644 | + SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE, | |
645 | + ssif_info->recv, | |
646 | + I2C_SMBUS_BLOCK_DATA); | |
647 | + if (rv < 0) { | |
648 | + if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
649 | + pr_info(PFX | |
650 | + "Error from i2c_non_blocking_op(2)\n"); | |
651 | + | |
652 | + result = -EIO; | |
653 | + } else | |
654 | + return; | |
655 | + } | |
656 | + } | |
657 | + | |
658 | + if (result < 0) { | |
659 | + ssif_inc_stat(ssif_info, receive_errors); | |
660 | + } else { | |
661 | + ssif_inc_stat(ssif_info, received_messages); | |
662 | + ssif_inc_stat(ssif_info, received_message_parts); | |
663 | + } | |
664 | + | |
665 | + | |
666 | + continue_op: | |
667 | + if (ssif_info->ssif_debug & SSIF_DEBUG_STATE) | |
668 | + pr_info(PFX "DONE 1: state = %d, result=%d.\n", | |
669 | + ssif_info->ssif_state, result); | |
670 | + | |
671 | + flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
672 | + msg = ssif_info->curr_msg; | |
673 | + if (msg) { | |
674 | + msg->rsp_size = len; | |
675 | + if (msg->rsp_size > IPMI_MAX_MSG_LENGTH) | |
676 | + msg->rsp_size = IPMI_MAX_MSG_LENGTH; | |
677 | + memcpy(msg->rsp, data, msg->rsp_size); | |
678 | + ssif_info->curr_msg = NULL; | |
679 | + } | |
680 | + | |
681 | + switch (ssif_info->ssif_state) { | |
682 | + case SSIF_NORMAL: | |
683 | + ipmi_ssif_unlock_cond(ssif_info, flags); | |
684 | + if (!msg) | |
685 | + break; | |
686 | + | |
687 | + if (result < 0) | |
688 | + return_hosed_msg(ssif_info, msg); | |
689 | + else | |
690 | + deliver_recv_msg(ssif_info, msg); | |
691 | + break; | |
692 | + | |
693 | + case SSIF_GETTING_FLAGS: | |
694 | + /* We got the flags from the SSIF, now handle them. */ | |
695 | + if ((result < 0) || (len < 4) || (data[2] != 0)) { | |
696 | + /* | |
697 | + * Error fetching flags, or invalid length, | |
698 | + * just give up for now. | |
699 | + */ | |
700 | + ssif_info->ssif_state = SSIF_NORMAL; | |
701 | + ipmi_ssif_unlock_cond(ssif_info, flags); | |
702 | + pr_warn(PFX "Error getting flags: %d %d, %x\n", | |
703 | + result, len, data[2]); | |
704 | + } else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 | |
705 | + || data[1] != IPMI_GET_MSG_FLAGS_CMD) { | |
706 | + pr_warn(PFX "Invalid response getting flags: %x %x\n", | |
707 | + data[0], data[1]); | |
708 | + } else { | |
709 | + ssif_inc_stat(ssif_info, flag_fetches); | |
710 | + ssif_info->msg_flags = data[3]; | |
711 | + handle_flags(ssif_info, flags); | |
712 | + } | |
713 | + break; | |
714 | + | |
715 | + case SSIF_CLEARING_FLAGS: | |
716 | + /* We cleared the flags. */ | |
717 | + if ((result < 0) || (len < 3) || (data[2] != 0)) { | |
718 | + /* Error clearing flags */ | |
719 | + pr_warn(PFX "Error clearing flags: %d %d, %x\n", | |
720 | + result, len, data[2]); | |
721 | + } else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 | |
722 | + || data[1] != IPMI_CLEAR_MSG_FLAGS_CMD) { | |
723 | + pr_warn(PFX "Invalid response clearing flags: %x %x\n", | |
724 | + data[0], data[1]); | |
725 | + } | |
726 | + ssif_info->ssif_state = SSIF_NORMAL; | |
727 | + ipmi_ssif_unlock_cond(ssif_info, flags); | |
728 | + break; | |
729 | + | |
730 | + case SSIF_GETTING_EVENTS: | |
731 | + if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) { | |
732 | + /* Error getting event, probably done. */ | |
733 | + msg->done(msg); | |
734 | + | |
735 | + /* Take off the event flag. */ | |
736 | + ssif_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL; | |
737 | + handle_flags(ssif_info, flags); | |
738 | + } else if (msg->rsp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 | |
739 | + || msg->rsp[1] != IPMI_READ_EVENT_MSG_BUFFER_CMD) { | |
740 | + pr_warn(PFX "Invalid response getting events: %x %x\n", | |
741 | + msg->rsp[0], msg->rsp[1]); | |
742 | + msg->done(msg); | |
743 | + /* Take off the event flag. */ | |
744 | + ssif_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL; | |
745 | + handle_flags(ssif_info, flags); | |
746 | + } else { | |
747 | + handle_flags(ssif_info, flags); | |
748 | + ssif_inc_stat(ssif_info, events); | |
749 | + deliver_recv_msg(ssif_info, msg); | |
750 | + } | |
751 | + break; | |
752 | + | |
753 | + case SSIF_GETTING_MESSAGES: | |
754 | + if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) { | |
755 | + /* Error getting event, probably done. */ | |
756 | + msg->done(msg); | |
757 | + | |
758 | + /* Take off the msg flag. */ | |
759 | + ssif_info->msg_flags &= ~RECEIVE_MSG_AVAIL; | |
760 | + handle_flags(ssif_info, flags); | |
761 | + } else if (msg->rsp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 | |
762 | + || msg->rsp[1] != IPMI_GET_MSG_CMD) { | |
763 | + pr_warn(PFX "Invalid response clearing flags: %x %x\n", | |
764 | + msg->rsp[0], msg->rsp[1]); | |
765 | + msg->done(msg); | |
766 | + | |
767 | + /* Take off the msg flag. */ | |
768 | + ssif_info->msg_flags &= ~RECEIVE_MSG_AVAIL; | |
769 | + handle_flags(ssif_info, flags); | |
770 | + } else { | |
771 | + ssif_inc_stat(ssif_info, incoming_messages); | |
772 | + handle_flags(ssif_info, flags); | |
773 | + deliver_recv_msg(ssif_info, msg); | |
774 | + } | |
775 | + break; | |
776 | + } | |
777 | + | |
778 | + flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
779 | + if (SSIF_IDLE(ssif_info) && !ssif_info->stopping) { | |
780 | + if (ssif_info->req_events) | |
781 | + start_event_fetch(ssif_info, flags); | |
782 | + else if (ssif_info->req_flags) | |
783 | + start_flag_fetch(ssif_info, flags); | |
784 | + else | |
785 | + start_next_msg(ssif_info, flags); | |
786 | + } else | |
787 | + ipmi_ssif_unlock_cond(ssif_info, flags); | |
788 | + | |
789 | + if (ssif_info->ssif_debug & SSIF_DEBUG_STATE) | |
790 | + pr_info(PFX "DONE 2: state = %d.\n", ssif_info->ssif_state); | |
791 | +} | |
792 | + | |
793 | +static void msg_written_handler(struct ssif_info *ssif_info, int result, | |
794 | + unsigned char *data, unsigned int len) | |
795 | +{ | |
796 | + int rv; | |
797 | + | |
798 | + /* We are single-threaded here, so no need for a lock. */ | |
799 | + if (result < 0) { | |
800 | + ssif_info->retries_left--; | |
801 | + if (ssif_info->retries_left > 0) { | |
802 | + if (!start_resend(ssif_info)) { | |
803 | + ssif_inc_stat(ssif_info, send_retries); | |
804 | + return; | |
805 | + } | |
806 | + /* request failed, just return the error. */ | |
807 | + ssif_inc_stat(ssif_info, send_errors); | |
808 | + | |
809 | + if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
810 | + pr_info(PFX | |
811 | + "Out of retries in msg_written_handler\n"); | |
812 | + msg_done_handler(ssif_info, -EIO, NULL, 0); | |
813 | + return; | |
814 | + } | |
815 | + | |
816 | + ssif_inc_stat(ssif_info, send_errors); | |
817 | + | |
818 | + /* | |
819 | + * Got an error on transmit, let the done routine | |
820 | + * handle it. | |
821 | + */ | |
822 | + if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
823 | + pr_info("Error in msg_written_handler: %d\n", result); | |
824 | + | |
825 | + msg_done_handler(ssif_info, result, NULL, 0); | |
826 | + return; | |
827 | + } | |
828 | + | |
829 | + if (ssif_info->multi_data) { | |
830 | + /* In the middle of a multi-data write. */ | |
831 | + int left; | |
832 | + | |
833 | + ssif_inc_stat(ssif_info, sent_messages_parts); | |
834 | + | |
835 | + left = ssif_info->multi_len - ssif_info->multi_pos; | |
836 | + if (left > 32) | |
837 | + left = 32; | |
838 | + /* Length byte. */ | |
839 | + ssif_info->multi_data[ssif_info->multi_pos] = left; | |
840 | + ssif_info->multi_pos += left; | |
841 | + if (left < 32) | |
842 | + /* | |
843 | + * Write is finished. Note that we must end | |
844 | + * with a write of less than 32 bytes to | |
845 | + * complete the transaction, even if it is | |
846 | + * zero bytes. | |
847 | + */ | |
848 | + ssif_info->multi_data = NULL; | |
849 | + | |
850 | + rv = ssif_i2c_send(ssif_info, msg_written_handler, | |
851 | + I2C_SMBUS_WRITE, | |
852 | + SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE, | |
853 | + ssif_info->multi_data + ssif_info->multi_pos, | |
854 | + I2C_SMBUS_BLOCK_DATA); | |
855 | + if (rv < 0) { | |
856 | + /* request failed, just return the error. */ | |
857 | + ssif_inc_stat(ssif_info, send_errors); | |
858 | + | |
859 | + if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
860 | + pr_info("Error from i2c_non_blocking_op(3)\n"); | |
861 | + msg_done_handler(ssif_info, -EIO, NULL, 0); | |
862 | + } | |
863 | + } else { | |
864 | + ssif_inc_stat(ssif_info, sent_messages); | |
865 | + ssif_inc_stat(ssif_info, sent_messages_parts); | |
866 | + | |
867 | + /* Wait a jiffie then request the next message */ | |
868 | + ssif_info->retries_left = SSIF_RECV_RETRIES; | |
869 | + ssif_info->rtc_us_timer = SSIF_MSG_PART_USEC; | |
870 | + mod_timer(&ssif_info->retry_timer, | |
871 | + jiffies + SSIF_MSG_PART_JIFFIES); | |
872 | + return; | |
873 | + } | |
874 | +} | |
875 | + | |
876 | +static int start_resend(struct ssif_info *ssif_info) | |
877 | +{ | |
878 | + int rv; | |
879 | + int command; | |
880 | + | |
881 | + if (ssif_info->data_len > 32) { | |
882 | + command = SSIF_IPMI_MULTI_PART_REQUEST_START; | |
883 | + ssif_info->multi_data = ssif_info->data; | |
884 | + ssif_info->multi_len = ssif_info->data_len; | |
885 | + /* | |
886 | + * Subtle thing, this is 32, not 33, because we will | |
887 | + * overwrite the thing at position 32 (which was just | |
888 | + * transmitted) with the new length. | |
889 | + */ | |
890 | + ssif_info->multi_pos = 32; | |
891 | + ssif_info->data[0] = 32; | |
892 | + } else { | |
893 | + ssif_info->multi_data = NULL; | |
894 | + command = SSIF_IPMI_REQUEST; | |
895 | + ssif_info->data[0] = ssif_info->data_len; | |
896 | + } | |
897 | + | |
898 | + rv = ssif_i2c_send(ssif_info, msg_written_handler, I2C_SMBUS_WRITE, | |
899 | + command, ssif_info->data, I2C_SMBUS_BLOCK_DATA); | |
900 | + if (rv && (ssif_info->ssif_debug & SSIF_DEBUG_MSG)) | |
901 | + pr_info("Error from i2c_non_blocking_op(4)\n"); | |
902 | + return rv; | |
903 | +} | |
904 | + | |
905 | +static int start_send(struct ssif_info *ssif_info, | |
906 | + unsigned char *data, | |
907 | + unsigned int len) | |
908 | +{ | |
909 | + if (len > IPMI_MAX_MSG_LENGTH) | |
910 | + return -E2BIG; | |
911 | + if (len > ssif_info->max_xmit_msg_size) | |
912 | + return -E2BIG; | |
913 | + | |
914 | + ssif_info->retries_left = SSIF_SEND_RETRIES; | |
915 | + memcpy(ssif_info->data+1, data, len); | |
916 | + ssif_info->data_len = len; | |
917 | + return start_resend(ssif_info); | |
918 | +} | |
919 | + | |
920 | +/* Must be called with the message lock held. */ | |
921 | +static void start_next_msg(struct ssif_info *ssif_info, unsigned long *flags) | |
922 | +{ | |
923 | + struct ipmi_smi_msg *msg; | |
924 | + unsigned long oflags; | |
925 | + | |
926 | + restart: | |
927 | + if (!SSIF_IDLE(ssif_info)) { | |
928 | + ipmi_ssif_unlock_cond(ssif_info, flags); | |
929 | + return; | |
930 | + } | |
931 | + | |
932 | + if (!ssif_info->waiting_msg) { | |
933 | + ssif_info->curr_msg = NULL; | |
934 | + ipmi_ssif_unlock_cond(ssif_info, flags); | |
935 | + } else { | |
936 | + int rv; | |
937 | + | |
938 | + ssif_info->curr_msg = ssif_info->waiting_msg; | |
939 | + ssif_info->waiting_msg = NULL; | |
940 | + ipmi_ssif_unlock_cond(ssif_info, flags); | |
941 | + rv = start_send(ssif_info, | |
942 | + ssif_info->curr_msg->data, | |
943 | + ssif_info->curr_msg->data_size); | |
944 | + if (rv) { | |
945 | + msg = ssif_info->curr_msg; | |
946 | + ssif_info->curr_msg = NULL; | |
947 | + return_hosed_msg(ssif_info, msg); | |
948 | + flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
949 | + goto restart; | |
950 | + } | |
951 | + } | |
952 | +} | |
953 | + | |
954 | +static void sender(void *send_info, | |
955 | + struct ipmi_smi_msg *msg) | |
956 | +{ | |
957 | + struct ssif_info *ssif_info = (struct ssif_info *) send_info; | |
958 | + unsigned long oflags, *flags; | |
959 | + | |
960 | + BUG_ON(ssif_info->waiting_msg); | |
961 | + ssif_info->waiting_msg = msg; | |
962 | + | |
963 | + flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
964 | + start_next_msg(ssif_info, flags); | |
965 | + | |
966 | + if (ssif_info->ssif_debug & SSIF_DEBUG_TIMING) { | |
967 | + struct timeval t; | |
968 | + | |
969 | + do_gettimeofday(&t); | |
970 | + pr_info("**Enqueue %02x %02x: %ld.%6.6ld\n", | |
971 | + msg->data[0], msg->data[1], t.tv_sec, t.tv_usec); | |
972 | + } | |
973 | +} | |
974 | + | |
975 | +static int get_smi_info(void *send_info, struct ipmi_smi_info *data) | |
976 | +{ | |
977 | + struct ssif_info *ssif_info = send_info; | |
978 | + | |
979 | + data->addr_src = ssif_info->addr_source; | |
980 | + data->dev = &ssif_info->client->dev; | |
981 | + data->addr_info = ssif_info->addr_info; | |
982 | + get_device(data->dev); | |
983 | + | |
984 | + return 0; | |
985 | +} | |
986 | + | |
987 | +/* | |
988 | + * Instead of having our own timer to periodically check the message | |
989 | + * flags, we let the message handler drive us. | |
990 | + */ | |
991 | +static void request_events(void *send_info) | |
992 | +{ | |
993 | + struct ssif_info *ssif_info = (struct ssif_info *) send_info; | |
994 | + unsigned long oflags, *flags; | |
995 | + | |
996 | + if (!ssif_info->has_event_buffer) | |
997 | + return; | |
998 | + | |
999 | + flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
1000 | + /* | |
1001 | + * Request flags first, not events, because the lower layer | |
1002 | + * doesn't have a way to send an attention. But make sure | |
1003 | + * event checking still happens. | |
1004 | + */ | |
1005 | + ssif_info->req_events = true; | |
1006 | + if (SSIF_IDLE(ssif_info)) | |
1007 | + start_flag_fetch(ssif_info, flags); | |
1008 | + else { | |
1009 | + ssif_info->req_flags = true; | |
1010 | + ipmi_ssif_unlock_cond(ssif_info, flags); | |
1011 | + } | |
1012 | +} | |
1013 | + | |
1014 | +static int inc_usecount(void *send_info) | |
1015 | +{ | |
1016 | + struct ssif_info *ssif_info = send_info; | |
1017 | + | |
1018 | + if (!i2c_get_adapter(ssif_info->client->adapter->nr)) | |
1019 | + return -ENODEV; | |
1020 | + | |
1021 | + i2c_use_client(ssif_info->client); | |
1022 | + return 0; | |
1023 | +} | |
1024 | + | |
1025 | +static void dec_usecount(void *send_info) | |
1026 | +{ | |
1027 | + struct ssif_info *ssif_info = send_info; | |
1028 | + | |
1029 | + i2c_release_client(ssif_info->client); | |
1030 | + i2c_put_adapter(ssif_info->client->adapter); | |
1031 | +} | |
1032 | + | |
1033 | +static int ssif_start_processing(void *send_info, | |
1034 | + ipmi_smi_t intf) | |
1035 | +{ | |
1036 | + struct ssif_info *ssif_info = send_info; | |
1037 | + | |
1038 | + ssif_info->intf = intf; | |
1039 | + | |
1040 | + return 0; | |
1041 | +} | |
1042 | + | |
1043 | +#define MAX_SSIF_BMCS 4 | |
1044 | + | |
1045 | +static unsigned short addr[MAX_SSIF_BMCS]; | |
1046 | +static int num_addrs; | |
1047 | +module_param_array(addr, ushort, &num_addrs, 0); | |
1048 | +MODULE_PARM_DESC(addr, "The addresses to scan for IPMI BMCs on the SSIFs."); | |
1049 | + | |
1050 | +static char *adapter_name[MAX_SSIF_BMCS]; | |
1051 | +static int num_adapter_names; | |
1052 | +module_param_array(adapter_name, charp, &num_adapter_names, 0); | |
1053 | +MODULE_PARM_DESC(adapter_name, "The string name of the I2C device that has the BMC. By default all devices are scanned."); | |
1054 | + | |
1055 | +static int slave_addrs[MAX_SSIF_BMCS]; | |
1056 | +static int num_slave_addrs; | |
1057 | +module_param_array(slave_addrs, int, &num_slave_addrs, 0); | |
1058 | +MODULE_PARM_DESC(slave_addrs, | |
1059 | + "The default IPMB slave address for the controller."); | |
1060 | + | |
1061 | +/* | |
1062 | + * Bit 0 enables message debugging, bit 1 enables state debugging, and | |
1063 | + * bit 2 enables timing debugging. This is an array indexed by | |
1064 | + * interface number" | |
1065 | + */ | |
1066 | +static int dbg[MAX_SSIF_BMCS]; | |
1067 | +static int num_dbg; | |
1068 | +module_param_array(dbg, int, &num_dbg, 0); | |
1069 | +MODULE_PARM_DESC(dbg, "Turn on debugging."); | |
1070 | + | |
1071 | +static bool ssif_dbg_probe; | |
1072 | +module_param_named(dbg_probe, ssif_dbg_probe, bool, 0); | |
1073 | +MODULE_PARM_DESC(dbg_probe, "Enable debugging of probing of adapters."); | |
1074 | + | |
1075 | +static int use_thread; | |
1076 | +module_param(use_thread, int, 0); | |
1077 | +MODULE_PARM_DESC(use_thread, "Use the thread interface."); | |
1078 | + | |
1079 | +static bool ssif_tryacpi = 1; | |
1080 | +module_param_named(tryacpi, ssif_tryacpi, bool, 0); | |
1081 | +MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the default scan of the interfaces identified via ACPI"); | |
1082 | + | |
1083 | +static bool ssif_trydmi = 1; | |
1084 | +module_param_named(trydmi, ssif_trydmi, bool, 0); | |
1085 | +MODULE_PARM_DESC(trydmi, "Setting this to zero will disable the default scan of the interfaces identified via DMI (SMBIOS)"); | |
1086 | + | |
1087 | +static DEFINE_MUTEX(ssif_infos_mutex); | |
1088 | +static LIST_HEAD(ssif_infos); | |
1089 | + | |
1090 | +static int ssif_remove(struct i2c_client *client) | |
1091 | +{ | |
1092 | + struct ssif_info *ssif_info = i2c_get_clientdata(client); | |
1093 | + int rv; | |
1094 | + | |
1095 | + if (!ssif_info) | |
1096 | + return 0; | |
1097 | + | |
1098 | + i2c_set_clientdata(client, NULL); | |
1099 | + | |
1100 | + /* | |
1101 | + * After this point, we won't deliver anything asychronously | |
1102 | + * to the message handler. We can unregister ourself. | |
1103 | + */ | |
1104 | + rv = ipmi_unregister_smi(ssif_info->intf); | |
1105 | + if (rv) { | |
1106 | + pr_err(PFX "Unable to unregister device: errno=%d\n", rv); | |
1107 | + return rv; | |
1108 | + } | |
1109 | + ssif_info->intf = NULL; | |
1110 | + | |
1111 | + /* make sure the driver is not looking for flags any more. */ | |
1112 | + while (ssif_info->ssif_state != SSIF_NORMAL) | |
1113 | + schedule_timeout(1); | |
1114 | + | |
1115 | + ssif_info->stopping = true; | |
1116 | + del_timer_sync(&ssif_info->retry_timer); | |
1117 | + if (ssif_info->thread) { | |
1118 | + complete(&ssif_info->wake_thread); | |
1119 | + kthread_stop(ssif_info->thread); | |
1120 | + } | |
1121 | + | |
1122 | + /* | |
1123 | + * No message can be outstanding now, we have removed the | |
1124 | + * upper layer and it permitted us to do so. | |
1125 | + */ | |
1126 | + kfree(ssif_info); | |
1127 | + return 0; | |
1128 | +} | |
1129 | + | |
1130 | +static int do_cmd(struct i2c_client *client, int len, unsigned char *msg, | |
1131 | + int *resp_len, unsigned char *resp) | |
1132 | +{ | |
1133 | + int retry_cnt; | |
1134 | + int ret; | |
1135 | + | |
1136 | + retry_cnt = SSIF_SEND_RETRIES; | |
1137 | + retry1: | |
1138 | + ret = i2c_smbus_write_block_data(client, SSIF_IPMI_REQUEST, len, msg); | |
1139 | + if (ret) { | |
1140 | + retry_cnt--; | |
1141 | + if (retry_cnt > 0) | |
1142 | + goto retry1; | |
1143 | + return -ENODEV; | |
1144 | + } | |
1145 | + | |
1146 | + ret = -ENODEV; | |
1147 | + retry_cnt = SSIF_RECV_RETRIES; | |
1148 | + while (retry_cnt > 0) { | |
1149 | + ret = i2c_smbus_read_block_data(client, SSIF_IPMI_RESPONSE, | |
1150 | + resp); | |
1151 | + if (ret > 0) | |
1152 | + break; | |
1153 | + msleep(SSIF_MSG_MSEC); | |
1154 | + retry_cnt--; | |
1155 | + if (retry_cnt <= 0) | |
1156 | + break; | |
1157 | + } | |
1158 | + | |
1159 | + if (ret > 0) { | |
1160 | + /* Validate that the response is correct. */ | |
1161 | + if (ret < 3 || | |
1162 | + (resp[0] != (msg[0] | (1 << 2))) || | |
1163 | + (resp[1] != msg[1])) | |
1164 | + ret = -EINVAL; | |
1165 | + else { | |
1166 | + *resp_len = ret; | |
1167 | + ret = 0; | |
1168 | + } | |
1169 | + } | |
1170 | + | |
1171 | + return ret; | |
1172 | +} | |
1173 | + | |
1174 | +static int ssif_detect(struct i2c_client *client, struct i2c_board_info *info) | |
1175 | +{ | |
1176 | + unsigned char *resp; | |
1177 | + unsigned char msg[3]; | |
1178 | + int rv; | |
1179 | + int len; | |
1180 | + | |
1181 | + resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); | |
1182 | + if (!resp) | |
1183 | + return -ENOMEM; | |
1184 | + | |
1185 | + /* Do a Get Device ID command, since it is required. */ | |
1186 | + msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1187 | + msg[1] = IPMI_GET_DEVICE_ID_CMD; | |
1188 | + rv = do_cmd(client, 2, msg, &len, resp); | |
1189 | + if (rv) | |
1190 | + rv = -ENODEV; | |
1191 | + else | |
1192 | + strlcpy(info->type, DEVICE_NAME, I2C_NAME_SIZE); | |
1193 | + kfree(resp); | |
1194 | + return rv; | |
1195 | +} | |
1196 | + | |
1197 | +static int smi_type_proc_show(struct seq_file *m, void *v) | |
1198 | +{ | |
1199 | + return seq_puts(m, "ssif\n"); | |
1200 | +} | |
1201 | + | |
1202 | +static int smi_type_proc_open(struct inode *inode, struct file *file) | |
1203 | +{ | |
1204 | + return single_open(file, smi_type_proc_show, inode->i_private); | |
1205 | +} | |
1206 | + | |
1207 | +static const struct file_operations smi_type_proc_ops = { | |
1208 | + .open = smi_type_proc_open, | |
1209 | + .read = seq_read, | |
1210 | + .llseek = seq_lseek, | |
1211 | + .release = single_release, | |
1212 | +}; | |
1213 | + | |
1214 | +static int smi_stats_proc_show(struct seq_file *m, void *v) | |
1215 | +{ | |
1216 | + struct ssif_info *ssif_info = m->private; | |
1217 | + | |
1218 | + seq_printf(m, "sent_messages: %u\n", | |
1219 | + ssif_get_stat(ssif_info, sent_messages)); | |
1220 | + seq_printf(m, "sent_messages_parts: %u\n", | |
1221 | + ssif_get_stat(ssif_info, sent_messages_parts)); | |
1222 | + seq_printf(m, "send_retries: %u\n", | |
1223 | + ssif_get_stat(ssif_info, send_retries)); | |
1224 | + seq_printf(m, "send_errors: %u\n", | |
1225 | + ssif_get_stat(ssif_info, send_errors)); | |
1226 | + seq_printf(m, "received_messages: %u\n", | |
1227 | + ssif_get_stat(ssif_info, received_messages)); | |
1228 | + seq_printf(m, "received_message_parts: %u\n", | |
1229 | + ssif_get_stat(ssif_info, received_message_parts)); | |
1230 | + seq_printf(m, "receive_retries: %u\n", | |
1231 | + ssif_get_stat(ssif_info, receive_retries)); | |
1232 | + seq_printf(m, "receive_errors: %u\n", | |
1233 | + ssif_get_stat(ssif_info, receive_errors)); | |
1234 | + seq_printf(m, "flag_fetches: %u\n", | |
1235 | + ssif_get_stat(ssif_info, flag_fetches)); | |
1236 | + seq_printf(m, "hosed: %u\n", | |
1237 | + ssif_get_stat(ssif_info, hosed)); | |
1238 | + seq_printf(m, "events: %u\n", | |
1239 | + ssif_get_stat(ssif_info, events)); | |
1240 | + seq_printf(m, "watchdog_pretimeouts: %u\n", | |
1241 | + ssif_get_stat(ssif_info, watchdog_pretimeouts)); | |
1242 | + return 0; | |
1243 | +} | |
1244 | + | |
1245 | +static int smi_stats_proc_open(struct inode *inode, struct file *file) | |
1246 | +{ | |
1247 | + return single_open(file, smi_stats_proc_show, PDE_DATA(inode)); | |
1248 | +} | |
1249 | + | |
1250 | +static const struct file_operations smi_stats_proc_ops = { | |
1251 | + .open = smi_stats_proc_open, | |
1252 | + .read = seq_read, | |
1253 | + .llseek = seq_lseek, | |
1254 | + .release = single_release, | |
1255 | +}; | |
1256 | + | |
1257 | +static struct ssif_addr_info *ssif_info_find(unsigned short addr, | |
1258 | + char *adapter_name, | |
1259 | + bool match_null_name) | |
1260 | +{ | |
1261 | + struct ssif_addr_info *info, *found = NULL; | |
1262 | + | |
1263 | +restart: | |
1264 | + list_for_each_entry(info, &ssif_infos, link) { | |
1265 | + if (info->binfo.addr == addr) { | |
1266 | + if (info->adapter_name || adapter_name) { | |
1267 | + if (!info->adapter_name != !adapter_name) { | |
1268 | + /* One is NULL and one is not */ | |
1269 | + continue; | |
1270 | + } | |
1271 | + if (strcmp(info->adapter_name, adapter_name)) | |
1272 | + /* Names to not match */ | |
1273 | + continue; | |
1274 | + } | |
1275 | + found = info; | |
1276 | + break; | |
1277 | + } | |
1278 | + } | |
1279 | + | |
1280 | + if (!found && match_null_name) { | |
1281 | + /* Try to get an exact match first, then try with a NULL name */ | |
1282 | + adapter_name = NULL; | |
1283 | + match_null_name = false; | |
1284 | + goto restart; | |
1285 | + } | |
1286 | + | |
1287 | + return found; | |
1288 | +} | |
1289 | + | |
1290 | +static bool check_acpi(struct ssif_info *ssif_info, struct device *dev) | |
1291 | +{ | |
1292 | +#ifdef CONFIG_ACPI | |
1293 | + acpi_handle acpi_handle; | |
1294 | + | |
1295 | + acpi_handle = ACPI_HANDLE(dev); | |
1296 | + if (acpi_handle) { | |
1297 | + ssif_info->addr_source = SI_ACPI; | |
1298 | + ssif_info->addr_info.acpi_info.acpi_handle = acpi_handle; | |
1299 | + return true; | |
1300 | + } | |
1301 | +#endif | |
1302 | + return false; | |
1303 | +} | |
1304 | + | |
1305 | +static int ssif_probe(struct i2c_client *client, const struct i2c_device_id *id) | |
1306 | +{ | |
1307 | + unsigned char msg[3]; | |
1308 | + unsigned char *resp; | |
1309 | + struct ssif_info *ssif_info; | |
1310 | + int rv = 0; | |
1311 | + int len; | |
1312 | + int i; | |
1313 | + u8 slave_addr = 0; | |
1314 | + struct ssif_addr_info *addr_info = NULL; | |
1315 | + | |
1316 | + | |
1317 | + resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); | |
1318 | + if (!resp) | |
1319 | + return -ENOMEM; | |
1320 | + | |
1321 | + ssif_info = kzalloc(sizeof(*ssif_info), GFP_KERNEL); | |
1322 | + if (!ssif_info) { | |
1323 | + kfree(resp); | |
1324 | + return -ENOMEM; | |
1325 | + } | |
1326 | + | |
1327 | + if (!check_acpi(ssif_info, &client->dev)) { | |
1328 | + addr_info = ssif_info_find(client->addr, client->adapter->name, | |
1329 | + true); | |
1330 | + if (!addr_info) { | |
1331 | + /* Must have come in through sysfs. */ | |
1332 | + ssif_info->addr_source = SI_HOTMOD; | |
1333 | + } else { | |
1334 | + ssif_info->addr_source = addr_info->addr_src; | |
1335 | + ssif_info->ssif_debug = addr_info->debug; | |
1336 | + ssif_info->addr_info = addr_info->addr_info; | |
1337 | + slave_addr = addr_info->slave_addr; | |
1338 | + } | |
1339 | + } | |
1340 | + | |
1341 | + pr_info(PFX "Trying %s-specified SSIF interface at i2c address 0x%x, adapter %s, slave address 0x%x\n", | |
1342 | + ipmi_addr_src_to_str(ssif_info->addr_source), | |
1343 | + client->addr, client->adapter->name, slave_addr); | |
1344 | + | |
1345 | + /* | |
1346 | + * Do a Get Device ID command, since it comes back with some | |
1347 | + * useful info. | |
1348 | + */ | |
1349 | + msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1350 | + msg[1] = IPMI_GET_DEVICE_ID_CMD; | |
1351 | + rv = do_cmd(client, 2, msg, &len, resp); | |
1352 | + if (rv) | |
1353 | + goto out; | |
1354 | + | |
1355 | + rv = ipmi_demangle_device_id(resp, len, &ssif_info->device_id); | |
1356 | + if (rv) | |
1357 | + goto out; | |
1358 | + | |
1359 | + ssif_info->client = client; | |
1360 | + i2c_set_clientdata(client, ssif_info); | |
1361 | + | |
1362 | + /* Now check for system interface capabilities */ | |
1363 | + msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1364 | + msg[1] = IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD; | |
1365 | + msg[2] = 0; /* SSIF */ | |
1366 | + rv = do_cmd(client, 3, msg, &len, resp); | |
1367 | + if (!rv && (len >= 3) && (resp[2] == 0)) { | |
1368 | + if (len < 7) { | |
1369 | + if (ssif_dbg_probe) | |
1370 | + pr_info(PFX "SSIF info too short: %d\n", len); | |
1371 | + goto no_support; | |
1372 | + } | |
1373 | + | |
1374 | + /* Got a good SSIF response, handle it. */ | |
1375 | + ssif_info->max_xmit_msg_size = resp[5]; | |
1376 | + ssif_info->max_recv_msg_size = resp[6]; | |
1377 | + ssif_info->multi_support = (resp[4] >> 6) & 0x3; | |
1378 | + ssif_info->supports_pec = (resp[4] >> 3) & 0x1; | |
1379 | + | |
1380 | + /* Sanitize the data */ | |
1381 | + switch (ssif_info->multi_support) { | |
1382 | + case SSIF_NO_MULTI: | |
1383 | + if (ssif_info->max_xmit_msg_size > 32) | |
1384 | + ssif_info->max_xmit_msg_size = 32; | |
1385 | + if (ssif_info->max_recv_msg_size > 32) | |
1386 | + ssif_info->max_recv_msg_size = 32; | |
1387 | + break; | |
1388 | + | |
1389 | + case SSIF_MULTI_2_PART: | |
1390 | + if (ssif_info->max_xmit_msg_size > 64) | |
1391 | + ssif_info->max_xmit_msg_size = 64; | |
1392 | + if (ssif_info->max_recv_msg_size > 62) | |
1393 | + ssif_info->max_recv_msg_size = 62; | |
1394 | + break; | |
1395 | + | |
1396 | + case SSIF_MULTI_n_PART: | |
1397 | + break; | |
1398 | + | |
1399 | + default: | |
1400 | + /* Data is not sane, just give up. */ | |
1401 | + goto no_support; | |
1402 | + } | |
1403 | + } else { | |
1404 | + no_support: | |
1405 | + /* Assume no multi-part or PEC support */ | |
1406 | + pr_info(PFX "Error fetching SSIF: %d %d %2.2x, your system probably doesn't support this command so using defaults\n", | |
1407 | + rv, len, resp[2]); | |
1408 | + | |
1409 | + ssif_info->max_xmit_msg_size = 32; | |
1410 | + ssif_info->max_recv_msg_size = 32; | |
1411 | + ssif_info->multi_support = SSIF_NO_MULTI; | |
1412 | + ssif_info->supports_pec = 0; | |
1413 | + } | |
1414 | + | |
1415 | + /* Make sure the NMI timeout is cleared. */ | |
1416 | + msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1417 | + msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD; | |
1418 | + msg[2] = WDT_PRE_TIMEOUT_INT; | |
1419 | + rv = do_cmd(client, 3, msg, &len, resp); | |
1420 | + if (rv || (len < 3) || (resp[2] != 0)) | |
1421 | + pr_warn(PFX "Unable to clear message flags: %d %d %2.2x\n", | |
1422 | + rv, len, resp[2]); | |
1423 | + | |
1424 | + /* Attempt to enable the event buffer. */ | |
1425 | + msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1426 | + msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; | |
1427 | + rv = do_cmd(client, 2, msg, &len, resp); | |
1428 | + if (rv || (len < 4) || (resp[2] != 0)) { | |
1429 | + pr_warn(PFX "Error getting global enables: %d %d %2.2x\n", | |
1430 | + rv, len, resp[2]); | |
1431 | + rv = 0; /* Not fatal */ | |
1432 | + goto found; | |
1433 | + } | |
1434 | + | |
1435 | + if (resp[3] & IPMI_BMC_EVT_MSG_BUFF) { | |
1436 | + ssif_info->has_event_buffer = true; | |
1437 | + /* buffer is already enabled, nothing to do. */ | |
1438 | + goto found; | |
1439 | + } | |
1440 | + | |
1441 | + msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1442 | + msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; | |
1443 | + msg[2] = resp[3] | IPMI_BMC_EVT_MSG_BUFF; | |
1444 | + rv = do_cmd(client, 3, msg, &len, resp); | |
1445 | + if (rv || (len < 2)) { | |
1446 | + pr_warn(PFX "Error getting global enables: %d %d %2.2x\n", | |
1447 | + rv, len, resp[2]); | |
1448 | + rv = 0; /* Not fatal */ | |
1449 | + goto found; | |
1450 | + } | |
1451 | + | |
1452 | + if (resp[2] == 0) | |
1453 | + /* A successful return means the event buffer is supported. */ | |
1454 | + ssif_info->has_event_buffer = true; | |
1455 | + | |
1456 | + found: | |
1457 | + ssif_info->intf_num = atomic_inc_return(&next_intf); | |
1458 | + | |
1459 | + if (ssif_dbg_probe) { | |
1460 | + pr_info("ssif_probe: i2c_probe found device at i2c address %x\n", | |
1461 | + client->addr); | |
1462 | + } | |
1463 | + | |
1464 | + spin_lock_init(&ssif_info->lock); | |
1465 | + ssif_info->ssif_state = SSIF_NORMAL; | |
1466 | + init_timer(&ssif_info->retry_timer); | |
1467 | + ssif_info->retry_timer.data = (unsigned long) ssif_info; | |
1468 | + ssif_info->retry_timer.function = retry_timeout; | |
1469 | + | |
1470 | + for (i = 0; i < SSIF_NUM_STATS; i++) | |
1471 | + atomic_set(&ssif_info->stats[i], 0); | |
1472 | + | |
1473 | + if (ssif_info->supports_pec) | |
1474 | + ssif_info->client->flags |= I2C_CLIENT_PEC; | |
1475 | + | |
1476 | + ssif_info->handlers.owner = THIS_MODULE; | |
1477 | + ssif_info->handlers.start_processing = ssif_start_processing; | |
1478 | + ssif_info->handlers.get_smi_info = get_smi_info; | |
1479 | + ssif_info->handlers.sender = sender; | |
1480 | + ssif_info->handlers.request_events = request_events; | |
1481 | + ssif_info->handlers.inc_usecount = inc_usecount; | |
1482 | + ssif_info->handlers.dec_usecount = dec_usecount; | |
1483 | + | |
1484 | + { | |
1485 | + unsigned int thread_num; | |
1486 | + | |
1487 | + thread_num = ((ssif_info->client->adapter->nr << 8) | | |
1488 | + ssif_info->client->addr); | |
1489 | + init_completion(&ssif_info->wake_thread); | |
1490 | + ssif_info->thread = kthread_run(ipmi_ssif_thread, ssif_info, | |
1491 | + "kssif%4.4x", thread_num); | |
1492 | + if (IS_ERR(ssif_info->thread)) { | |
1493 | + rv = PTR_ERR(ssif_info->thread); | |
1494 | + dev_notice(&ssif_info->client->dev, | |
1495 | + "Could not start kernel thread: error %d\n", | |
1496 | + rv); | |
1497 | + goto out; | |
1498 | + } | |
1499 | + } | |
1500 | + | |
1501 | + rv = ipmi_register_smi(&ssif_info->handlers, | |
1502 | + ssif_info, | |
1503 | + &ssif_info->device_id, | |
1504 | + &ssif_info->client->dev, | |
1505 | + slave_addr); | |
1506 | + if (rv) { | |
1507 | + pr_err(PFX "Unable to register device: error %d\n", rv); | |
1508 | + goto out; | |
1509 | + } | |
1510 | + | |
1511 | + rv = ipmi_smi_add_proc_entry(ssif_info->intf, "type", | |
1512 | + &smi_type_proc_ops, | |
1513 | + ssif_info); | |
1514 | + if (rv) { | |
1515 | + pr_err(PFX "Unable to create proc entry: %d\n", rv); | |
1516 | + goto out_err_unreg; | |
1517 | + } | |
1518 | + | |
1519 | + rv = ipmi_smi_add_proc_entry(ssif_info->intf, "ssif_stats", | |
1520 | + &smi_stats_proc_ops, | |
1521 | + ssif_info); | |
1522 | + if (rv) { | |
1523 | + pr_err(PFX "Unable to create proc entry: %d\n", rv); | |
1524 | + goto out_err_unreg; | |
1525 | + } | |
1526 | + | |
1527 | + out: | |
1528 | + if (rv) | |
1529 | + kfree(ssif_info); | |
1530 | + kfree(resp); | |
1531 | + return rv; | |
1532 | + | |
1533 | + out_err_unreg: | |
1534 | + ipmi_unregister_smi(ssif_info->intf); | |
1535 | + goto out; | |
1536 | +} | |
1537 | + | |
1538 | +static int ssif_adapter_handler(struct device *adev, void *opaque) | |
1539 | +{ | |
1540 | + struct ssif_addr_info *addr_info = opaque; | |
1541 | + | |
1542 | + if (adev->type != &i2c_adapter_type) | |
1543 | + return 0; | |
1544 | + | |
1545 | + i2c_new_device(to_i2c_adapter(adev), &addr_info->binfo); | |
1546 | + | |
1547 | + if (!addr_info->adapter_name) | |
1548 | + return 1; /* Only try the first I2C adapter by default. */ | |
1549 | + return 0; | |
1550 | +} | |
1551 | + | |
1552 | +static int new_ssif_client(int addr, char *adapter_name, | |
1553 | + int debug, int slave_addr, | |
1554 | + enum ipmi_addr_src addr_src) | |
1555 | +{ | |
1556 | + struct ssif_addr_info *addr_info; | |
1557 | + int rv = 0; | |
1558 | + | |
1559 | + mutex_lock(&ssif_infos_mutex); | |
1560 | + if (ssif_info_find(addr, adapter_name, false)) { | |
1561 | + rv = -EEXIST; | |
1562 | + goto out_unlock; | |
1563 | + } | |
1564 | + | |
1565 | + addr_info = kzalloc(sizeof(*addr_info), GFP_KERNEL); | |
1566 | + if (!addr_info) { | |
1567 | + rv = -ENOMEM; | |
1568 | + goto out_unlock; | |
1569 | + } | |
1570 | + | |
1571 | + if (adapter_name) { | |
1572 | + addr_info->adapter_name = kstrdup(adapter_name, GFP_KERNEL); | |
1573 | + if (!addr_info->adapter_name) { | |
1574 | + kfree(addr_info); | |
1575 | + rv = -ENOMEM; | |
1576 | + goto out_unlock; | |
1577 | + } | |
1578 | + } | |
1579 | + | |
1580 | + strncpy(addr_info->binfo.type, DEVICE_NAME, | |
1581 | + sizeof(addr_info->binfo.type)); | |
1582 | + addr_info->binfo.addr = addr; | |
1583 | + addr_info->binfo.platform_data = addr_info; | |
1584 | + addr_info->debug = debug; | |
1585 | + addr_info->slave_addr = slave_addr; | |
1586 | + addr_info->addr_src = addr_src; | |
1587 | + | |
1588 | + list_add_tail(&addr_info->link, &ssif_infos); | |
1589 | + | |
1590 | + if (initialized) | |
1591 | + i2c_for_each_dev(addr_info, ssif_adapter_handler); | |
1592 | + /* Otherwise address list will get it */ | |
1593 | + | |
1594 | +out_unlock: | |
1595 | + mutex_unlock(&ssif_infos_mutex); | |
1596 | + return rv; | |
1597 | +} | |
1598 | + | |
1599 | +static void free_ssif_clients(void) | |
1600 | +{ | |
1601 | + struct ssif_addr_info *info, *tmp; | |
1602 | + | |
1603 | + mutex_lock(&ssif_infos_mutex); | |
1604 | + list_for_each_entry_safe(info, tmp, &ssif_infos, link) { | |
1605 | + list_del(&info->link); | |
1606 | + kfree(info->adapter_name); | |
1607 | + kfree(info); | |
1608 | + } | |
1609 | + mutex_unlock(&ssif_infos_mutex); | |
1610 | +} | |
1611 | + | |
1612 | +static unsigned short *ssif_address_list(void) | |
1613 | +{ | |
1614 | + struct ssif_addr_info *info; | |
1615 | + unsigned int count = 0, i; | |
1616 | + unsigned short *address_list; | |
1617 | + | |
1618 | + list_for_each_entry(info, &ssif_infos, link) | |
1619 | + count++; | |
1620 | + | |
1621 | + address_list = kzalloc(sizeof(*address_list) * (count + 1), GFP_KERNEL); | |
1622 | + if (!address_list) | |
1623 | + return NULL; | |
1624 | + | |
1625 | + i = 0; | |
1626 | + list_for_each_entry(info, &ssif_infos, link) { | |
1627 | + unsigned short addr = info->binfo.addr; | |
1628 | + int j; | |
1629 | + | |
1630 | + for (j = 0; j < i; j++) { | |
1631 | + if (address_list[j] == addr) | |
1632 | + goto skip_addr; | |
1633 | + } | |
1634 | + address_list[i] = addr; | |
1635 | +skip_addr: | |
1636 | + i++; | |
1637 | + } | |
1638 | + address_list[i] = I2C_CLIENT_END; | |
1639 | + | |
1640 | + return address_list; | |
1641 | +} | |
1642 | + | |
1643 | +#ifdef CONFIG_ACPI | |
1644 | +static struct acpi_device_id ssif_acpi_match[] = { | |
1645 | + { "IPI0001", 0 }, | |
1646 | + { }, | |
1647 | +}; | |
1648 | +MODULE_DEVICE_TABLE(acpi, ssif_acpi_match); | |
1649 | + | |
1650 | +/* | |
1651 | + * Once we get an ACPI failure, we don't try any more, because we go | |
1652 | + * through the tables sequentially. Once we don't find a table, there | |
1653 | + * are no more. | |
1654 | + */ | |
1655 | +static int acpi_failure; | |
1656 | + | |
1657 | +/* | |
1658 | + * Defined in the IPMI 2.0 spec. | |
1659 | + */ | |
1660 | +struct SPMITable { | |
1661 | + s8 Signature[4]; | |
1662 | + u32 Length; | |
1663 | + u8 Revision; | |
1664 | + u8 Checksum; | |
1665 | + s8 OEMID[6]; | |
1666 | + s8 OEMTableID[8]; | |
1667 | + s8 OEMRevision[4]; | |
1668 | + s8 CreatorID[4]; | |
1669 | + s8 CreatorRevision[4]; | |
1670 | + u8 InterfaceType; | |
1671 | + u8 IPMIlegacy; | |
1672 | + s16 SpecificationRevision; | |
1673 | + | |
1674 | + /* | |
1675 | + * Bit 0 - SCI interrupt supported | |
1676 | + * Bit 1 - I/O APIC/SAPIC | |
1677 | + */ | |
1678 | + u8 InterruptType; | |
1679 | + | |
1680 | + /* | |
1681 | + * If bit 0 of InterruptType is set, then this is the SCI | |
1682 | + * interrupt in the GPEx_STS register. | |
1683 | + */ | |
1684 | + u8 GPE; | |
1685 | + | |
1686 | + s16 Reserved; | |
1687 | + | |
1688 | + /* | |
1689 | + * If bit 1 of InterruptType is set, then this is the I/O | |
1690 | + * APIC/SAPIC interrupt. | |
1691 | + */ | |
1692 | + u32 GlobalSystemInterrupt; | |
1693 | + | |
1694 | + /* The actual register address. */ | |
1695 | + struct acpi_generic_address addr; | |
1696 | + | |
1697 | + u8 UID[4]; | |
1698 | + | |
1699 | + s8 spmi_id[1]; /* A '\0' terminated array starts here. */ | |
1700 | +}; | |
1701 | + | |
1702 | +static int try_init_spmi(struct SPMITable *spmi) | |
1703 | +{ | |
1704 | + unsigned short myaddr; | |
1705 | + | |
1706 | + if (num_addrs >= MAX_SSIF_BMCS) | |
1707 | + return -1; | |
1708 | + | |
1709 | + if (spmi->IPMIlegacy != 1) { | |
1710 | + pr_warn("IPMI: Bad SPMI legacy: %d\n", spmi->IPMIlegacy); | |
1711 | + return -ENODEV; | |
1712 | + } | |
1713 | + | |
1714 | + if (spmi->InterfaceType != 4) | |
1715 | + return -ENODEV; | |
1716 | + | |
1717 | + if (spmi->addr.space_id != ACPI_ADR_SPACE_SMBUS) { | |
1718 | + pr_warn(PFX "Invalid ACPI SSIF I/O Address type: %d\n", | |
1719 | + spmi->addr.space_id); | |
1720 | + return -EIO; | |
1721 | + } | |
1722 | + | |
1723 | + myaddr = spmi->addr.address >> 1; | |
1724 | + | |
1725 | + return new_ssif_client(myaddr, NULL, 0, 0, SI_SPMI); | |
1726 | +} | |
1727 | + | |
1728 | +static void spmi_find_bmc(void) | |
1729 | +{ | |
1730 | + acpi_status status; | |
1731 | + struct SPMITable *spmi; | |
1732 | + int i; | |
1733 | + | |
1734 | + if (acpi_disabled) | |
1735 | + return; | |
1736 | + | |
1737 | + if (acpi_failure) | |
1738 | + return; | |
1739 | + | |
1740 | + for (i = 0; ; i++) { | |
1741 | + status = acpi_get_table(ACPI_SIG_SPMI, i+1, | |
1742 | + (struct acpi_table_header **)&spmi); | |
1743 | + if (status != AE_OK) | |
1744 | + return; | |
1745 | + | |
1746 | + try_init_spmi(spmi); | |
1747 | + } | |
1748 | +} | |
1749 | +#else | |
1750 | +static void spmi_find_bmc(void) { } | |
1751 | +#endif | |
1752 | + | |
1753 | +#ifdef CONFIG_DMI | |
1754 | +static int decode_dmi(const struct dmi_device *dmi_dev) | |
1755 | +{ | |
1756 | + struct dmi_header *dm = dmi_dev->device_data; | |
1757 | + u8 *data = (u8 *) dm; | |
1758 | + u8 len = dm->length; | |
1759 | + unsigned short myaddr; | |
1760 | + int slave_addr; | |
1761 | + | |
1762 | + if (num_addrs >= MAX_SSIF_BMCS) | |
1763 | + return -1; | |
1764 | + | |
1765 | + if (len < 9) | |
1766 | + return -1; | |
1767 | + | |
1768 | + if (data[0x04] != 4) /* Not SSIF */ | |
1769 | + return -1; | |
1770 | + | |
1771 | + if ((data[8] >> 1) == 0) { | |
1772 | + /* | |
1773 | + * Some broken systems put the I2C address in | |
1774 | + * the slave address field. We try to | |
1775 | + * accommodate them here. | |
1776 | + */ | |
1777 | + myaddr = data[6] >> 1; | |
1778 | + slave_addr = 0; | |
1779 | + } else { | |
1780 | + myaddr = data[8] >> 1; | |
1781 | + slave_addr = data[6]; | |
1782 | + } | |
1783 | + | |
1784 | + return new_ssif_client(myaddr, NULL, 0, 0, SI_SMBIOS); | |
1785 | +} | |
1786 | + | |
1787 | +static void dmi_iterator(void) | |
1788 | +{ | |
1789 | + const struct dmi_device *dev = NULL; | |
1790 | + | |
1791 | + while ((dev = dmi_find_device(DMI_DEV_TYPE_IPMI, NULL, dev))) | |
1792 | + decode_dmi(dev); | |
1793 | +} | |
1794 | +#else | |
1795 | +static void dmi_iterator(void) { } | |
1796 | +#endif | |
1797 | + | |
1798 | +static const struct i2c_device_id ssif_id[] = { | |
1799 | + { DEVICE_NAME, 0 }, | |
1800 | + { } | |
1801 | +}; | |
1802 | +MODULE_DEVICE_TABLE(i2c, ssif_id); | |
1803 | + | |
1804 | +static struct i2c_driver ssif_i2c_driver = { | |
1805 | + .class = I2C_CLASS_HWMON, | |
1806 | + .driver = { | |
1807 | + .owner = THIS_MODULE, | |
1808 | + .name = DEVICE_NAME | |
1809 | + }, | |
1810 | + .probe = ssif_probe, | |
1811 | + .remove = ssif_remove, | |
1812 | + .id_table = ssif_id, | |
1813 | + .detect = ssif_detect | |
1814 | +}; | |
1815 | + | |
1816 | +static int init_ipmi_ssif(void) | |
1817 | +{ | |
1818 | + int i; | |
1819 | + int rv; | |
1820 | + | |
1821 | + if (initialized) | |
1822 | + return 0; | |
1823 | + | |
1824 | + pr_info("IPMI SSIF Interface driver\n"); | |
1825 | + | |
1826 | + /* build list for i2c from addr list */ | |
1827 | + for (i = 0; i < num_addrs; i++) { | |
1828 | + rv = new_ssif_client(addr[i], adapter_name[i], | |
1829 | + dbg[i], slave_addrs[i], | |
1830 | + SI_HARDCODED); | |
1831 | + if (!rv) | |
1832 | + pr_err(PFX | |
1833 | + "Couldn't add hardcoded device at addr 0x%x\n", | |
1834 | + addr[i]); | |
1835 | + } | |
1836 | + | |
1837 | + if (ssif_tryacpi) | |
1838 | + ssif_i2c_driver.driver.acpi_match_table = | |
1839 | + ACPI_PTR(ssif_acpi_match); | |
1840 | + if (ssif_trydmi) | |
1841 | + dmi_iterator(); | |
1842 | + if (ssif_tryacpi) | |
1843 | + spmi_find_bmc(); | |
1844 | + | |
1845 | + ssif_i2c_driver.address_list = ssif_address_list(); | |
1846 | + | |
1847 | + rv = i2c_add_driver(&ssif_i2c_driver); | |
1848 | + if (!rv) | |
1849 | + initialized = true; | |
1850 | + | |
1851 | + return rv; | |
1852 | +} | |
1853 | +module_init(init_ipmi_ssif); | |
1854 | + | |
1855 | +static void cleanup_ipmi_ssif(void) | |
1856 | +{ | |
1857 | + if (!initialized) | |
1858 | + return; | |
1859 | + | |
1860 | + initialized = false; | |
1861 | + | |
1862 | + i2c_del_driver(&ssif_i2c_driver); | |
1863 | + | |
1864 | + free_ssif_clients(); | |
1865 | +} | |
1866 | +module_exit(cleanup_ipmi_ssif); | |
1867 | + | |
1868 | +MODULE_AUTHOR("Todd C Davis <todd.c.davis@intel.com>, Corey Minyard <minyard@acm.org>"); | |
1869 | +MODULE_DESCRIPTION("IPMI driver for management controllers on a SMBus"); | |
1870 | +MODULE_LICENSE("GPL"); |