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Kristian Høgsbergc781c062007-05-07 20:33:32 -04001/*
2 * SBP2 driver (SCSI over IEEE1394)
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05003 *
Kristian Høgsberg27a15e52007-02-06 14:49:39 -05004 * Copyright (C) 2005-2007 Kristian Hoegsberg <krh@bitplanet.net>
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05005 *
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
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 */
20
Kristian Høgsbergc781c062007-05-07 20:33:32 -040021/*
22 * The basic structure of this driver is based on the old storage driver,
Kristian Høgsberg27a15e52007-02-06 14:49:39 -050023 * drivers/ieee1394/sbp2.c, originally written by
24 * James Goodwin <jamesg@filanet.com>
25 * with later contributions and ongoing maintenance from
26 * Ben Collins <bcollins@debian.org>,
27 * Stefan Richter <stefanr@s5r6.in-berlin.de>
28 * and many others.
29 */
30
Stefan Richter7bb6bf72008-02-03 23:12:17 +010031#include <linux/blkdev.h>
Stefan Richter9220f192008-02-03 23:04:38 +010032#include <linux/delay.h>
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -050033#include <linux/device.h>
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -050034#include <linux/dma-mapping.h>
Stefan Richter7bb6bf72008-02-03 23:12:17 +010035#include <linux/kernel.h>
36#include <linux/mod_devicetable.h>
37#include <linux/module.h>
38#include <linux/moduleparam.h>
39#include <linux/scatterlist.h>
Stefan Richtere7cdf232007-07-01 13:54:57 +020040#include <linux/string.h>
Stefan Richter2df222b2007-08-13 17:48:25 +020041#include <linux/stringify.h>
Kristian Høgsberg1d3d52c2007-02-06 14:49:33 -050042#include <linux/timer.h>
Stefan Richterdf8ec242007-08-12 12:51:18 +020043#include <linux/workqueue.h>
Stefan Richterb5d2a5e2008-01-25 18:57:41 +010044#include <asm/system.h>
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -050045
46#include <scsi/scsi.h>
47#include <scsi/scsi_cmnd.h>
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -050048#include <scsi/scsi_device.h>
49#include <scsi/scsi_host.h>
50
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -050051#include "fw-device.h"
Stefan Richter7bb6bf72008-02-03 23:12:17 +010052#include "fw-topology.h"
53#include "fw-transaction.h"
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -050054
Stefan Richter5cd54c92007-06-17 23:55:41 +020055/*
56 * So far only bridges from Oxford Semiconductor are known to support
57 * concurrent logins. Depending on firmware, four or two concurrent logins
58 * are possible on OXFW911 and newer Oxsemi bridges.
59 *
60 * Concurrent logins are useful together with cluster filesystems.
61 */
62static int sbp2_param_exclusive_login = 1;
63module_param_named(exclusive_login, sbp2_param_exclusive_login, bool, 0644);
64MODULE_PARM_DESC(exclusive_login, "Exclusive login to sbp2 device "
65 "(default = Y, use N for concurrent initiators)");
66
Stefan Richter2df222b2007-08-13 17:48:25 +020067/*
68 * Flags for firmware oddities
69 *
70 * - 128kB max transfer
71 * Limit transfer size. Necessary for some old bridges.
72 *
73 * - 36 byte inquiry
74 * When scsi_mod probes the device, let the inquiry command look like that
75 * from MS Windows.
76 *
77 * - skip mode page 8
78 * Suppress sending of mode_sense for mode page 8 if the device pretends to
79 * support the SCSI Primary Block commands instead of Reduced Block Commands.
80 *
81 * - fix capacity
82 * Tell sd_mod to correct the last sector number reported by read_capacity.
83 * Avoids access beyond actual disk limits on devices with an off-by-one bug.
84 * Don't use this with devices which don't have this bug.
85 *
Stefan Richter9220f192008-02-03 23:04:38 +010086 * - delay inquiry
87 * Wait extra SBP2_INQUIRY_DELAY seconds after login before SCSI inquiry.
88 *
Stefan Richter2df222b2007-08-13 17:48:25 +020089 * - override internal blacklist
90 * Instead of adding to the built-in blacklist, use only the workarounds
91 * specified in the module load parameter.
92 * Useful if a blacklist entry interfered with a non-broken device.
93 */
94#define SBP2_WORKAROUND_128K_MAX_TRANS 0x1
95#define SBP2_WORKAROUND_INQUIRY_36 0x2
96#define SBP2_WORKAROUND_MODE_SENSE_8 0x4
97#define SBP2_WORKAROUND_FIX_CAPACITY 0x8
Stefan Richter9220f192008-02-03 23:04:38 +010098#define SBP2_WORKAROUND_DELAY_INQUIRY 0x10
99#define SBP2_INQUIRY_DELAY 12
Stefan Richter2df222b2007-08-13 17:48:25 +0200100#define SBP2_WORKAROUND_OVERRIDE 0x100
101
102static int sbp2_param_workarounds;
103module_param_named(workarounds, sbp2_param_workarounds, int, 0644);
104MODULE_PARM_DESC(workarounds, "Work around device bugs (default = 0"
105 ", 128kB max transfer = " __stringify(SBP2_WORKAROUND_128K_MAX_TRANS)
106 ", 36 byte inquiry = " __stringify(SBP2_WORKAROUND_INQUIRY_36)
107 ", skip mode page 8 = " __stringify(SBP2_WORKAROUND_MODE_SENSE_8)
108 ", fix capacity = " __stringify(SBP2_WORKAROUND_FIX_CAPACITY)
Stefan Richter9220f192008-02-03 23:04:38 +0100109 ", delay inquiry = " __stringify(SBP2_WORKAROUND_DELAY_INQUIRY)
Stefan Richter2df222b2007-08-13 17:48:25 +0200110 ", override internal blacklist = " __stringify(SBP2_WORKAROUND_OVERRIDE)
111 ", or a combination)");
112
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500113/* I don't know why the SCSI stack doesn't define something like this... */
Kristian Høgsberga98e2712007-05-07 20:33:34 -0400114typedef void (*scsi_done_fn_t)(struct scsi_cmnd *);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500115
116static const char sbp2_driver_name[] = "sbp2";
117
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200118/*
119 * We create one struct sbp2_logical_unit per SBP-2 Logical Unit Number Entry
120 * and one struct scsi_device per sbp2_logical_unit.
121 */
122struct sbp2_logical_unit {
123 struct sbp2_target *tgt;
124 struct list_head link;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500125 struct fw_address_handler address_handler;
126 struct list_head orb_list;
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200127
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500128 u64 command_block_agent_address;
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200129 u16 lun;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500130 int login_id;
131
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400132 /*
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200133 * The generation is updated once we've logged in or reconnected
134 * to the logical unit. Thus, I/O to the device will automatically
135 * fail and get retried if it happens in a window where the device
136 * is not ready, e.g. after a bus reset but before we reconnect.
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400137 */
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500138 int generation;
Kristian Høgsberg7f37c422007-02-06 14:49:34 -0500139 int retries;
140 struct delayed_work work;
Stefan Richterf8436152008-02-26 23:30:02 +0100141 bool has_sdev;
Stefan Richter2e2705b2008-02-16 16:37:28 +0100142 bool blocked;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500143};
144
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200145/*
146 * We create one struct sbp2_target per IEEE 1212 Unit Directory
147 * and one struct Scsi_Host per sbp2_target.
148 */
149struct sbp2_target {
150 struct kref kref;
151 struct fw_unit *unit;
Stefan Richter48f18c72008-02-03 23:09:50 +0100152 const char *bus_id;
Stefan Richter05cca7382008-01-26 17:42:45 +0100153 struct list_head lu_list;
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200154
155 u64 management_agent_address;
Stefan Richterc9755e12008-03-24 20:54:28 +0100156 u64 guid;
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200157 int directory_id;
158 int node_id;
159 int address_high;
Stefan Richter05cca7382008-01-26 17:42:45 +0100160 unsigned int workarounds;
Jarod Wilson384170d2008-01-25 23:31:12 -0500161 unsigned int mgt_orb_timeout;
Stefan Richter2e2705b2008-02-16 16:37:28 +0100162
163 int dont_block; /* counter for each logical unit */
164 int blocked; /* ditto */
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200165};
166
Jarod Wilsona4c379c2008-01-19 13:15:05 +0100167/*
168 * Per section 7.4.8 of the SBP-2 spec, a mgt_ORB_timeout value can be
Jarod Wilson384170d2008-01-25 23:31:12 -0500169 * provided in the config rom. Most devices do provide a value, which
170 * we'll use for login management orbs, but with some sane limits.
Jarod Wilsona4c379c2008-01-19 13:15:05 +0100171 */
Jarod Wilson384170d2008-01-25 23:31:12 -0500172#define SBP2_MIN_LOGIN_ORB_TIMEOUT 5000U /* Timeout in ms */
173#define SBP2_MAX_LOGIN_ORB_TIMEOUT 40000U /* Timeout in ms */
Stefan Richter05cca7382008-01-26 17:42:45 +0100174#define SBP2_ORB_TIMEOUT 2000U /* Timeout in ms */
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500175#define SBP2_ORB_NULL 0x80000000
Jarod Wilsona4c379c2008-01-19 13:15:05 +0100176#define SBP2_MAX_SG_ELEMENT_LENGTH 0xf000
Jarod Wilson17cff9f2008-03-07 01:43:31 -0500177#define SBP2_RETRY_LIMIT 0xf /* 15 retries */
178#define SBP2_CYCLE_LIMIT (0xc8 << 12) /* 200 125us cycles */
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500179
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500180/* Unit directory keys */
Jarod Wilson384170d2008-01-25 23:31:12 -0500181#define SBP2_CSR_UNIT_CHARACTERISTICS 0x3a
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200182#define SBP2_CSR_FIRMWARE_REVISION 0x3c
183#define SBP2_CSR_LOGICAL_UNIT_NUMBER 0x14
184#define SBP2_CSR_LOGICAL_UNIT_DIRECTORY 0xd4
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500185
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500186/* Management orb opcodes */
187#define SBP2_LOGIN_REQUEST 0x0
188#define SBP2_QUERY_LOGINS_REQUEST 0x1
189#define SBP2_RECONNECT_REQUEST 0x3
190#define SBP2_SET_PASSWORD_REQUEST 0x4
191#define SBP2_LOGOUT_REQUEST 0x7
192#define SBP2_ABORT_TASK_REQUEST 0xb
193#define SBP2_ABORT_TASK_SET 0xc
194#define SBP2_LOGICAL_UNIT_RESET 0xe
195#define SBP2_TARGET_RESET_REQUEST 0xf
196
197/* Offsets for command block agent registers */
198#define SBP2_AGENT_STATE 0x00
199#define SBP2_AGENT_RESET 0x04
200#define SBP2_ORB_POINTER 0x08
201#define SBP2_DOORBELL 0x10
202#define SBP2_UNSOLICITED_STATUS_ENABLE 0x14
203
204/* Status write response codes */
205#define SBP2_STATUS_REQUEST_COMPLETE 0x0
206#define SBP2_STATUS_TRANSPORT_FAILURE 0x1
207#define SBP2_STATUS_ILLEGAL_REQUEST 0x2
208#define SBP2_STATUS_VENDOR_DEPENDENT 0x3
209
Kristian Høgsberga77754a2007-05-07 20:33:35 -0400210#define STATUS_GET_ORB_HIGH(v) ((v).status & 0xffff)
211#define STATUS_GET_SBP_STATUS(v) (((v).status >> 16) & 0xff)
212#define STATUS_GET_LEN(v) (((v).status >> 24) & 0x07)
213#define STATUS_GET_DEAD(v) (((v).status >> 27) & 0x01)
214#define STATUS_GET_RESPONSE(v) (((v).status >> 28) & 0x03)
215#define STATUS_GET_SOURCE(v) (((v).status >> 30) & 0x03)
216#define STATUS_GET_ORB_LOW(v) ((v).orb_low)
217#define STATUS_GET_DATA(v) ((v).data)
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500218
219struct sbp2_status {
220 u32 status;
221 u32 orb_low;
222 u8 data[24];
223};
224
225struct sbp2_pointer {
Stefan Richter71ee9f02008-02-28 20:51:11 +0100226 __be32 high;
227 __be32 low;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500228};
229
230struct sbp2_orb {
231 struct fw_transaction t;
Kristian Høgsberge57d2012007-08-24 18:59:58 -0400232 struct kref kref;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500233 dma_addr_t request_bus;
234 int rcode;
235 struct sbp2_pointer pointer;
Kristian Høgsberga98e2712007-05-07 20:33:34 -0400236 void (*callback)(struct sbp2_orb * orb, struct sbp2_status * status);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500237 struct list_head link;
238};
239
Kristian Høgsberga77754a2007-05-07 20:33:35 -0400240#define MANAGEMENT_ORB_LUN(v) ((v))
241#define MANAGEMENT_ORB_FUNCTION(v) ((v) << 16)
242#define MANAGEMENT_ORB_RECONNECT(v) ((v) << 20)
Stefan Richter5cd54c92007-06-17 23:55:41 +0200243#define MANAGEMENT_ORB_EXCLUSIVE(v) ((v) ? 1 << 28 : 0)
Kristian Høgsberga77754a2007-05-07 20:33:35 -0400244#define MANAGEMENT_ORB_REQUEST_FORMAT(v) ((v) << 29)
245#define MANAGEMENT_ORB_NOTIFY ((1) << 31)
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500246
Kristian Høgsberga77754a2007-05-07 20:33:35 -0400247#define MANAGEMENT_ORB_RESPONSE_LENGTH(v) ((v))
248#define MANAGEMENT_ORB_PASSWORD_LENGTH(v) ((v) << 16)
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500249
250struct sbp2_management_orb {
251 struct sbp2_orb base;
252 struct {
253 struct sbp2_pointer password;
254 struct sbp2_pointer response;
Stefan Richter71ee9f02008-02-28 20:51:11 +0100255 __be32 misc;
256 __be32 length;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500257 struct sbp2_pointer status_fifo;
258 } request;
259 __be32 response[4];
260 dma_addr_t response_bus;
261 struct completion done;
262 struct sbp2_status status;
263};
264
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500265struct sbp2_login_response {
Stefan Richter71ee9f02008-02-28 20:51:11 +0100266 __be32 misc;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500267 struct sbp2_pointer command_block_agent;
Stefan Richter71ee9f02008-02-28 20:51:11 +0100268 __be32 reconnect_hold;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500269};
Kristian Høgsberga77754a2007-05-07 20:33:35 -0400270#define COMMAND_ORB_DATA_SIZE(v) ((v))
271#define COMMAND_ORB_PAGE_SIZE(v) ((v) << 16)
272#define COMMAND_ORB_PAGE_TABLE_PRESENT ((1) << 19)
273#define COMMAND_ORB_MAX_PAYLOAD(v) ((v) << 20)
274#define COMMAND_ORB_SPEED(v) ((v) << 24)
Stefan Richter0d7dcbf2008-02-28 20:52:02 +0100275#define COMMAND_ORB_DIRECTION ((1) << 27)
Kristian Høgsberga77754a2007-05-07 20:33:35 -0400276#define COMMAND_ORB_REQUEST_FORMAT(v) ((v) << 29)
277#define COMMAND_ORB_NOTIFY ((1) << 31)
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500278
279struct sbp2_command_orb {
280 struct sbp2_orb base;
281 struct {
282 struct sbp2_pointer next;
283 struct sbp2_pointer data_descriptor;
Stefan Richter71ee9f02008-02-28 20:51:11 +0100284 __be32 misc;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500285 u8 command_block[12];
286 } request;
287 struct scsi_cmnd *cmd;
288 scsi_done_fn_t done;
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200289 struct sbp2_logical_unit *lu;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500290
Stefan Richter9fb2dd12007-07-01 13:55:31 +0200291 struct sbp2_pointer page_table[SG_ALL] __attribute__((aligned(8)));
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500292 dma_addr_t page_table_bus;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500293};
294
295/*
296 * List of devices with known bugs.
297 *
298 * The firmware_revision field, masked with 0xffff00, is the best
299 * indicator for the type of bridge chip of a device. It yields a few
300 * false positives but this did not break correctly behaving devices
301 * so far. We use ~0 as a wildcard, since the 24 bit values we get
302 * from the config rom can never match that.
303 */
304static const struct {
305 u32 firmware_revision;
306 u32 model;
Stefan Richter05cca7382008-01-26 17:42:45 +0100307 unsigned int workarounds;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500308} sbp2_workarounds_table[] = {
309 /* DViCO Momobay CX-1 with TSB42AA9 bridge */ {
310 .firmware_revision = 0x002800,
311 .model = 0x001010,
312 .workarounds = SBP2_WORKAROUND_INQUIRY_36 |
313 SBP2_WORKAROUND_MODE_SENSE_8,
314 },
Stefan Richter9220f192008-02-03 23:04:38 +0100315 /* DViCO Momobay FX-3A with TSB42AA9A bridge */ {
316 .firmware_revision = 0x002800,
317 .model = 0x000000,
318 .workarounds = SBP2_WORKAROUND_DELAY_INQUIRY,
319 },
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500320 /* Initio bridges, actually only needed for some older ones */ {
321 .firmware_revision = 0x000200,
322 .model = ~0,
323 .workarounds = SBP2_WORKAROUND_INQUIRY_36,
324 },
325 /* Symbios bridge */ {
326 .firmware_revision = 0xa0b800,
327 .model = ~0,
328 .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS,
329 },
Stefan Richter2aa9ff72008-03-11 22:32:03 +0100330 /* Datafab MD2-FW2 with Symbios/LSILogic SYM13FW500 bridge */ {
331 .firmware_revision = 0x002600,
332 .model = ~0,
333 .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS,
334 },
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400335
336 /*
337 * There are iPods (2nd gen, 3rd gen) with model_id == 0, but
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500338 * these iPods do not feature the read_capacity bug according
339 * to one report. Read_capacity behaviour as well as model_id
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400340 * could change due to Apple-supplied firmware updates though.
341 */
342
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500343 /* iPod 4th generation. */ {
344 .firmware_revision = 0x0a2700,
345 .model = 0x000021,
346 .workarounds = SBP2_WORKAROUND_FIX_CAPACITY,
347 },
348 /* iPod mini */ {
349 .firmware_revision = 0x0a2700,
350 .model = 0x000023,
351 .workarounds = SBP2_WORKAROUND_FIX_CAPACITY,
352 },
353 /* iPod Photo */ {
354 .firmware_revision = 0x0a2700,
355 .model = 0x00007e,
356 .workarounds = SBP2_WORKAROUND_FIX_CAPACITY,
357 }
358};
359
360static void
Kristian Høgsberge57d2012007-08-24 18:59:58 -0400361free_orb(struct kref *kref)
362{
363 struct sbp2_orb *orb = container_of(kref, struct sbp2_orb, kref);
364
365 kfree(orb);
366}
367
368static void
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500369sbp2_status_write(struct fw_card *card, struct fw_request *request,
370 int tcode, int destination, int source,
371 int generation, int speed,
372 unsigned long long offset,
373 void *payload, size_t length, void *callback_data)
374{
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200375 struct sbp2_logical_unit *lu = callback_data;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500376 struct sbp2_orb *orb;
377 struct sbp2_status status;
378 size_t header_size;
379 unsigned long flags;
380
381 if (tcode != TCODE_WRITE_BLOCK_REQUEST ||
Kristian Høgsberg2d826cc2007-05-09 19:23:14 -0400382 length == 0 || length > sizeof(status)) {
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500383 fw_send_response(card, request, RCODE_TYPE_ERROR);
384 return;
385 }
386
387 header_size = min(length, 2 * sizeof(u32));
388 fw_memcpy_from_be32(&status, payload, header_size);
389 if (length > header_size)
390 memcpy(status.data, payload + 8, length - header_size);
Kristian Høgsberga77754a2007-05-07 20:33:35 -0400391 if (STATUS_GET_SOURCE(status) == 2 || STATUS_GET_SOURCE(status) == 3) {
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500392 fw_notify("non-orb related status write, not handled\n");
393 fw_send_response(card, request, RCODE_COMPLETE);
394 return;
395 }
396
397 /* Lookup the orb corresponding to this status write. */
398 spin_lock_irqsave(&card->lock, flags);
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200399 list_for_each_entry(orb, &lu->orb_list, link) {
Kristian Høgsberga77754a2007-05-07 20:33:35 -0400400 if (STATUS_GET_ORB_HIGH(status) == 0 &&
Kristian Høgsberge57d2012007-08-24 18:59:58 -0400401 STATUS_GET_ORB_LOW(status) == orb->request_bus) {
402 orb->rcode = RCODE_COMPLETE;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500403 list_del(&orb->link);
404 break;
405 }
406 }
407 spin_unlock_irqrestore(&card->lock, flags);
408
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200409 if (&orb->link != &lu->orb_list)
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500410 orb->callback(orb, &status);
411 else
412 fw_error("status write for unknown orb\n");
413
Kristian Høgsberge57d2012007-08-24 18:59:58 -0400414 kref_put(&orb->kref, free_orb);
415
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500416 fw_send_response(card, request, RCODE_COMPLETE);
417}
418
419static void
420complete_transaction(struct fw_card *card, int rcode,
421 void *payload, size_t length, void *data)
422{
423 struct sbp2_orb *orb = data;
424 unsigned long flags;
425
Kristian Høgsberge57d2012007-08-24 18:59:58 -0400426 /*
427 * This is a little tricky. We can get the status write for
428 * the orb before we get this callback. The status write
429 * handler above will assume the orb pointer transaction was
430 * successful and set the rcode to RCODE_COMPLETE for the orb.
431 * So this callback only sets the rcode if it hasn't already
432 * been set and only does the cleanup if the transaction
433 * failed and we didn't already get a status write.
434 */
435 spin_lock_irqsave(&card->lock, flags);
436
437 if (orb->rcode == -1)
438 orb->rcode = rcode;
439 if (orb->rcode != RCODE_COMPLETE) {
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500440 list_del(&orb->link);
Stefan Richter1b34e972007-08-25 10:40:42 +0200441 spin_unlock_irqrestore(&card->lock, flags);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500442 orb->callback(orb, NULL);
Stefan Richter1b34e972007-08-25 10:40:42 +0200443 } else {
444 spin_unlock_irqrestore(&card->lock, flags);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500445 }
Kristian Høgsberge57d2012007-08-24 18:59:58 -0400446
Kristian Høgsberge57d2012007-08-24 18:59:58 -0400447 kref_put(&orb->kref, free_orb);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500448}
449
450static void
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200451sbp2_send_orb(struct sbp2_orb *orb, struct sbp2_logical_unit *lu,
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500452 int node_id, int generation, u64 offset)
453{
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200454 struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500455 unsigned long flags;
456
457 orb->pointer.high = 0;
Stefan Richter71ee9f02008-02-28 20:51:11 +0100458 orb->pointer.low = cpu_to_be32(orb->request_bus);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500459
460 spin_lock_irqsave(&device->card->lock, flags);
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200461 list_add_tail(&orb->link, &lu->orb_list);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500462 spin_unlock_irqrestore(&device->card->lock, flags);
463
Kristian Høgsberge57d2012007-08-24 18:59:58 -0400464 /* Take a ref for the orb list and for the transaction callback. */
465 kref_get(&orb->kref);
466 kref_get(&orb->kref);
467
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500468 fw_send_request(device->card, &orb->t, TCODE_WRITE_BLOCK_REQUEST,
Stefan Richterf1397492007-06-10 21:31:36 +0200469 node_id, generation, device->max_speed, offset,
Kristian Høgsberg2d826cc2007-05-09 19:23:14 -0400470 &orb->pointer, sizeof(orb->pointer),
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500471 complete_transaction, orb);
472}
473
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200474static int sbp2_cancel_orbs(struct sbp2_logical_unit *lu)
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500475{
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200476 struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500477 struct sbp2_orb *orb, *next;
478 struct list_head list;
479 unsigned long flags;
Kristian Høgsberg2aaad972007-03-07 12:12:47 -0500480 int retval = -ENOENT;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500481
482 INIT_LIST_HEAD(&list);
483 spin_lock_irqsave(&device->card->lock, flags);
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200484 list_splice_init(&lu->orb_list, &list);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500485 spin_unlock_irqrestore(&device->card->lock, flags);
486
487 list_for_each_entry_safe(orb, next, &list, link) {
Kristian Høgsberg2aaad972007-03-07 12:12:47 -0500488 retval = 0;
Kristian Høgsberg730c32f2007-02-06 14:49:32 -0500489 if (fw_cancel_transaction(device->card, &orb->t) == 0)
490 continue;
491
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500492 orb->rcode = RCODE_CANCELLED;
493 orb->callback(orb, NULL);
494 }
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500495
Kristian Høgsberg2aaad972007-03-07 12:12:47 -0500496 return retval;
Kristian Høgsberg1d3d52c2007-02-06 14:49:33 -0500497}
498
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500499static void
500complete_management_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
501{
502 struct sbp2_management_orb *orb =
Jay Fenlason6f061482007-06-27 16:04:33 -0400503 container_of(base_orb, struct sbp2_management_orb, base);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500504
505 if (status)
Kristian Høgsberg2d826cc2007-05-09 19:23:14 -0400506 memcpy(&orb->status, status, sizeof(*status));
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500507 complete(&orb->done);
508}
509
510static int
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200511sbp2_send_management_orb(struct sbp2_logical_unit *lu, int node_id,
512 int generation, int function, int lun_or_login_id,
513 void *response)
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500514{
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200515 struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500516 struct sbp2_management_orb *orb;
Jarod Wilsona4c379c2008-01-19 13:15:05 +0100517 unsigned int timeout;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500518 int retval = -ENOMEM;
519
Stefan Richterbe6f48b2008-01-27 19:14:44 +0100520 if (function == SBP2_LOGOUT_REQUEST && fw_device_is_shutdown(device))
521 return 0;
522
Kristian Høgsberg2d826cc2007-05-09 19:23:14 -0400523 orb = kzalloc(sizeof(*orb), GFP_ATOMIC);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500524 if (orb == NULL)
525 return -ENOMEM;
526
Kristian Høgsberge57d2012007-08-24 18:59:58 -0400527 kref_init(&orb->base.kref);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500528 orb->response_bus =
529 dma_map_single(device->card->device, &orb->response,
Kristian Høgsberg2d826cc2007-05-09 19:23:14 -0400530 sizeof(orb->response), DMA_FROM_DEVICE);
Kristian Høgsberg82eff9d2007-02-06 14:49:40 -0500531 if (dma_mapping_error(orb->response_bus))
Stefan Richter7aa48482007-07-02 21:04:44 +0200532 goto fail_mapping_response;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500533
Stefan Richter71ee9f02008-02-28 20:51:11 +0100534 orb->request.response.high = 0;
535 orb->request.response.low = cpu_to_be32(orb->response_bus);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500536
Stefan Richter71ee9f02008-02-28 20:51:11 +0100537 orb->request.misc = cpu_to_be32(
Kristian Høgsberga77754a2007-05-07 20:33:35 -0400538 MANAGEMENT_ORB_NOTIFY |
539 MANAGEMENT_ORB_FUNCTION(function) |
Stefan Richter71ee9f02008-02-28 20:51:11 +0100540 MANAGEMENT_ORB_LUN(lun_or_login_id));
541 orb->request.length = cpu_to_be32(
542 MANAGEMENT_ORB_RESPONSE_LENGTH(sizeof(orb->response)));
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500543
Stefan Richter71ee9f02008-02-28 20:51:11 +0100544 orb->request.status_fifo.high =
545 cpu_to_be32(lu->address_handler.offset >> 32);
546 orb->request.status_fifo.low =
547 cpu_to_be32(lu->address_handler.offset);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500548
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500549 if (function == SBP2_LOGIN_REQUEST) {
Stefan Richter14dc9922008-01-20 01:25:31 +0100550 /* Ask for 2^2 == 4 seconds reconnect grace period */
Stefan Richter71ee9f02008-02-28 20:51:11 +0100551 orb->request.misc |= cpu_to_be32(
Stefan Richter14dc9922008-01-20 01:25:31 +0100552 MANAGEMENT_ORB_RECONNECT(2) |
Stefan Richter71ee9f02008-02-28 20:51:11 +0100553 MANAGEMENT_ORB_EXCLUSIVE(sbp2_param_exclusive_login));
Jarod Wilson384170d2008-01-25 23:31:12 -0500554 timeout = lu->tgt->mgt_orb_timeout;
Jarod Wilsona4c379c2008-01-19 13:15:05 +0100555 } else {
556 timeout = SBP2_ORB_TIMEOUT;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500557 }
558
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500559 init_completion(&orb->done);
560 orb->base.callback = complete_management_orb;
Kristian Høgsberg2aaad972007-03-07 12:12:47 -0500561
Stefan Richter7aa48482007-07-02 21:04:44 +0200562 orb->base.request_bus =
563 dma_map_single(device->card->device, &orb->request,
564 sizeof(orb->request), DMA_TO_DEVICE);
565 if (dma_mapping_error(orb->base.request_bus))
566 goto fail_mapping_request;
567
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200568 sbp2_send_orb(&orb->base, lu, node_id, generation,
569 lu->tgt->management_agent_address);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500570
Jarod Wilsona4c379c2008-01-19 13:15:05 +0100571 wait_for_completion_timeout(&orb->done, msecs_to_jiffies(timeout));
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500572
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500573 retval = -EIO;
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200574 if (sbp2_cancel_orbs(lu) == 0) {
Stefan Richter48f18c72008-02-03 23:09:50 +0100575 fw_error("%s: orb reply timed out, rcode=0x%02x\n",
576 lu->tgt->bus_id, orb->base.rcode);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500577 goto out;
578 }
579
Kristian Høgsberg2aaad972007-03-07 12:12:47 -0500580 if (orb->base.rcode != RCODE_COMPLETE) {
Stefan Richter48f18c72008-02-03 23:09:50 +0100581 fw_error("%s: management write failed, rcode 0x%02x\n",
582 lu->tgt->bus_id, orb->base.rcode);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500583 goto out;
584 }
585
Kristian Høgsberga77754a2007-05-07 20:33:35 -0400586 if (STATUS_GET_RESPONSE(orb->status) != 0 ||
587 STATUS_GET_SBP_STATUS(orb->status) != 0) {
Stefan Richter48f18c72008-02-03 23:09:50 +0100588 fw_error("%s: error status: %d:%d\n", lu->tgt->bus_id,
Kristian Høgsberga77754a2007-05-07 20:33:35 -0400589 STATUS_GET_RESPONSE(orb->status),
590 STATUS_GET_SBP_STATUS(orb->status));
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500591 goto out;
592 }
593
594 retval = 0;
595 out:
596 dma_unmap_single(device->card->device, orb->base.request_bus,
Kristian Høgsberg2d826cc2007-05-09 19:23:14 -0400597 sizeof(orb->request), DMA_TO_DEVICE);
Stefan Richter7aa48482007-07-02 21:04:44 +0200598 fail_mapping_request:
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500599 dma_unmap_single(device->card->device, orb->response_bus,
Kristian Høgsberg2d826cc2007-05-09 19:23:14 -0400600 sizeof(orb->response), DMA_FROM_DEVICE);
Stefan Richter7aa48482007-07-02 21:04:44 +0200601 fail_mapping_response:
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500602 if (response)
Stefan Richter71ee9f02008-02-28 20:51:11 +0100603 memcpy(response, orb->response, sizeof(orb->response));
Kristian Høgsberge57d2012007-08-24 18:59:58 -0400604 kref_put(&orb->base.kref, free_orb);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500605
606 return retval;
607}
608
609static void
610complete_agent_reset_write(struct fw_card *card, int rcode,
Stefan Richtere0e60212008-02-03 23:08:58 +0100611 void *payload, size_t length, void *done)
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500612{
Stefan Richtere0e60212008-02-03 23:08:58 +0100613 complete(done);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500614}
615
Stefan Richtere0e60212008-02-03 23:08:58 +0100616static void sbp2_agent_reset(struct sbp2_logical_unit *lu)
617{
618 struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
619 DECLARE_COMPLETION_ONSTACK(done);
620 struct fw_transaction t;
621 static u32 z;
622
623 fw_send_request(device->card, &t, TCODE_WRITE_QUADLET_REQUEST,
624 lu->tgt->node_id, lu->generation, device->max_speed,
625 lu->command_block_agent_address + SBP2_AGENT_RESET,
626 &z, sizeof(z), complete_agent_reset_write, &done);
627 wait_for_completion(&done);
628}
629
630static void
631complete_agent_reset_write_no_wait(struct fw_card *card, int rcode,
632 void *payload, size_t length, void *data)
633{
634 kfree(data);
635}
636
637static void sbp2_agent_reset_no_wait(struct sbp2_logical_unit *lu)
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500638{
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200639 struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500640 struct fw_transaction *t;
Stefan Richtere0e60212008-02-03 23:08:58 +0100641 static u32 z;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500642
Stefan Richtere0e60212008-02-03 23:08:58 +0100643 t = kmalloc(sizeof(*t), GFP_ATOMIC);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500644 if (t == NULL)
Stefan Richtere0e60212008-02-03 23:08:58 +0100645 return;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500646
647 fw_send_request(device->card, t, TCODE_WRITE_QUADLET_REQUEST,
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200648 lu->tgt->node_id, lu->generation, device->max_speed,
649 lu->command_block_agent_address + SBP2_AGENT_RESET,
Stefan Richtere0e60212008-02-03 23:08:58 +0100650 &z, sizeof(z), complete_agent_reset_write_no_wait, t);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500651}
652
Stefan Richter2e2705b2008-02-16 16:37:28 +0100653static void sbp2_set_generation(struct sbp2_logical_unit *lu, int generation)
654{
655 struct fw_card *card = fw_device(lu->tgt->unit->device.parent)->card;
656 unsigned long flags;
657
658 /* serialize with comparisons of lu->generation and card->generation */
659 spin_lock_irqsave(&card->lock, flags);
660 lu->generation = generation;
661 spin_unlock_irqrestore(&card->lock, flags);
662}
663
664static inline void sbp2_allow_block(struct sbp2_logical_unit *lu)
665{
666 /*
667 * We may access dont_block without taking card->lock here:
668 * All callers of sbp2_allow_block() and all callers of sbp2_unblock()
669 * are currently serialized against each other.
670 * And a wrong result in sbp2_conditionally_block()'s access of
671 * dont_block is rather harmless, it simply misses its first chance.
672 */
673 --lu->tgt->dont_block;
674}
675
676/*
677 * Blocks lu->tgt if all of the following conditions are met:
678 * - Login, INQUIRY, and high-level SCSI setup of all of the target's
679 * logical units have been finished (indicated by dont_block == 0).
680 * - lu->generation is stale.
681 *
682 * Note, scsi_block_requests() must be called while holding card->lock,
683 * otherwise it might foil sbp2_[conditionally_]unblock()'s attempt to
684 * unblock the target.
685 */
686static void sbp2_conditionally_block(struct sbp2_logical_unit *lu)
687{
688 struct sbp2_target *tgt = lu->tgt;
689 struct fw_card *card = fw_device(tgt->unit->device.parent)->card;
690 struct Scsi_Host *shost =
691 container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
692 unsigned long flags;
693
694 spin_lock_irqsave(&card->lock, flags);
695 if (!tgt->dont_block && !lu->blocked &&
696 lu->generation != card->generation) {
697 lu->blocked = true;
Stefan Richtera5fd9ec2008-02-28 20:53:45 +0100698 if (++tgt->blocked == 1)
Stefan Richter2e2705b2008-02-16 16:37:28 +0100699 scsi_block_requests(shost);
Stefan Richter2e2705b2008-02-16 16:37:28 +0100700 }
701 spin_unlock_irqrestore(&card->lock, flags);
702}
703
704/*
705 * Unblocks lu->tgt as soon as all its logical units can be unblocked.
706 * Note, it is harmless to run scsi_unblock_requests() outside the
707 * card->lock protected section. On the other hand, running it inside
708 * the section might clash with shost->host_lock.
709 */
710static void sbp2_conditionally_unblock(struct sbp2_logical_unit *lu)
711{
712 struct sbp2_target *tgt = lu->tgt;
713 struct fw_card *card = fw_device(tgt->unit->device.parent)->card;
714 struct Scsi_Host *shost =
715 container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
716 unsigned long flags;
717 bool unblock = false;
718
719 spin_lock_irqsave(&card->lock, flags);
720 if (lu->blocked && lu->generation == card->generation) {
721 lu->blocked = false;
722 unblock = --tgt->blocked == 0;
723 }
724 spin_unlock_irqrestore(&card->lock, flags);
725
Stefan Richtera5fd9ec2008-02-28 20:53:45 +0100726 if (unblock)
Stefan Richter2e2705b2008-02-16 16:37:28 +0100727 scsi_unblock_requests(shost);
Stefan Richter2e2705b2008-02-16 16:37:28 +0100728}
729
730/*
731 * Prevents future blocking of tgt and unblocks it.
732 * Note, it is harmless to run scsi_unblock_requests() outside the
733 * card->lock protected section. On the other hand, running it inside
734 * the section might clash with shost->host_lock.
735 */
736static void sbp2_unblock(struct sbp2_target *tgt)
737{
738 struct fw_card *card = fw_device(tgt->unit->device.parent)->card;
739 struct Scsi_Host *shost =
740 container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
741 unsigned long flags;
742
743 spin_lock_irqsave(&card->lock, flags);
744 ++tgt->dont_block;
745 spin_unlock_irqrestore(&card->lock, flags);
746
747 scsi_unblock_requests(shost);
748}
749
Stefan Richterf8436152008-02-26 23:30:02 +0100750static int sbp2_lun2int(u16 lun)
751{
752 struct scsi_lun eight_bytes_lun;
753
754 memset(&eight_bytes_lun, 0, sizeof(eight_bytes_lun));
755 eight_bytes_lun.scsi_lun[0] = (lun >> 8) & 0xff;
756 eight_bytes_lun.scsi_lun[1] = lun & 0xff;
757
758 return scsilun_to_int(&eight_bytes_lun);
759}
760
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200761static void sbp2_release_target(struct kref *kref)
Kristian Høgsbergb3d6e152007-03-14 17:34:58 -0400762{
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200763 struct sbp2_target *tgt = container_of(kref, struct sbp2_target, kref);
764 struct sbp2_logical_unit *lu, *next;
765 struct Scsi_Host *shost =
766 container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
Stefan Richterf8436152008-02-26 23:30:02 +0100767 struct scsi_device *sdev;
Stefan Richter855c6032008-02-27 22:14:27 +0100768 struct fw_device *device = fw_device(tgt->unit->device.parent);
Kristian Høgsbergb3d6e152007-03-14 17:34:58 -0400769
Stefan Richter2e2705b2008-02-16 16:37:28 +0100770 /* prevent deadlocks */
771 sbp2_unblock(tgt);
772
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200773 list_for_each_entry_safe(lu, next, &tgt->lu_list, link) {
Stefan Richterf8436152008-02-26 23:30:02 +0100774 sdev = scsi_device_lookup(shost, 0, 0, sbp2_lun2int(lu->lun));
775 if (sdev) {
776 scsi_remove_device(sdev);
777 scsi_device_put(sdev);
Stefan Richter33f1c6c32008-02-19 09:05:49 +0100778 }
Stefan Richterbe6f48b2008-01-27 19:14:44 +0100779 sbp2_send_management_orb(lu, tgt->node_id, lu->generation,
780 SBP2_LOGOUT_REQUEST, lu->login_id, NULL);
Stefan Richter4dccd022008-01-20 01:24:26 +0100781
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200782 fw_core_remove_address_handler(&lu->address_handler);
783 list_del(&lu->link);
784 kfree(lu);
785 }
786 scsi_remove_host(shost);
Stefan Richterf32ddad2008-04-24 23:17:47 +0200787 fw_notify("released %s, target %d:0:0\n", tgt->bus_id, shost->host_no);
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200788
Stefan Richter1dc3bea2008-02-24 19:01:21 +0100789 fw_unit_put(tgt->unit);
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200790 scsi_host_put(shost);
Stefan Richter855c6032008-02-27 22:14:27 +0100791 fw_device_put(device);
Kristian Høgsbergb3d6e152007-03-14 17:34:58 -0400792}
793
Stefan Richterdf8ec242007-08-12 12:51:18 +0200794static struct workqueue_struct *sbp2_wq;
795
Stefan Richter285838e2007-11-07 01:12:51 +0100796/*
797 * Always get the target's kref when scheduling work on one its units.
798 * Each workqueue job is responsible to call sbp2_target_put() upon return.
799 */
800static void sbp2_queue_work(struct sbp2_logical_unit *lu, unsigned long delay)
801{
802 if (queue_delayed_work(sbp2_wq, &lu->work, delay))
803 kref_get(&lu->tgt->kref);
804}
805
806static void sbp2_target_put(struct sbp2_target *tgt)
807{
808 kref_put(&tgt->kref, sbp2_release_target);
809}
810
Jarod Wilson51f9dbe2008-03-07 01:43:01 -0500811static void
812complete_set_busy_timeout(struct fw_card *card, int rcode,
813 void *payload, size_t length, void *done)
814{
815 complete(done);
816}
817
Jarod Wilson17cff9f2008-03-07 01:43:31 -0500818/*
819 * Write retransmit retry values into the BUSY_TIMEOUT register.
820 * - The single-phase retry protocol is supported by all SBP-2 devices, but the
821 * default retry_limit value is 0 (i.e. never retry transmission). We write a
822 * saner value after logging into the device.
823 * - The dual-phase retry protocol is optional to implement, and if not
824 * supported, writes to the dual-phase portion of the register will be
825 * ignored. We try to write the original 1394-1995 default here.
826 * - In the case of devices that are also SBP-3-compliant, all writes are
827 * ignored, as the register is read-only, but contains single-phase retry of
828 * 15, which is what we're trying to set for all SBP-2 device anyway, so this
829 * write attempt is safe and yields more consistent behavior for all devices.
830 *
831 * See section 8.3.2.3.5 of the 1394-1995 spec, section 6.2 of the SBP-2 spec,
832 * and section 6.4 of the SBP-3 spec for further details.
833 */
Jarod Wilson51f9dbe2008-03-07 01:43:01 -0500834static void sbp2_set_busy_timeout(struct sbp2_logical_unit *lu)
835{
836 struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
837 DECLARE_COMPLETION_ONSTACK(done);
838 struct fw_transaction t;
839 static __be32 busy_timeout;
840
Jarod Wilson17cff9f2008-03-07 01:43:31 -0500841 busy_timeout = cpu_to_be32(SBP2_CYCLE_LIMIT | SBP2_RETRY_LIMIT);
Jarod Wilson51f9dbe2008-03-07 01:43:01 -0500842
843 fw_send_request(device->card, &t, TCODE_WRITE_QUADLET_REQUEST,
844 lu->tgt->node_id, lu->generation, device->max_speed,
845 CSR_REGISTER_BASE + CSR_BUSY_TIMEOUT, &busy_timeout,
846 sizeof(busy_timeout), complete_set_busy_timeout, &done);
847 wait_for_completion(&done);
848}
849
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200850static void sbp2_reconnect(struct work_struct *work);
851
Kristian Høgsberg7f37c422007-02-06 14:49:34 -0500852static void sbp2_login(struct work_struct *work)
853{
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200854 struct sbp2_logical_unit *lu =
855 container_of(work, struct sbp2_logical_unit, work.work);
Stefan Richter48f18c72008-02-03 23:09:50 +0100856 struct sbp2_target *tgt = lu->tgt;
857 struct fw_device *device = fw_device(tgt->unit->device.parent);
858 struct Scsi_Host *shost;
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200859 struct scsi_device *sdev;
Kristian Høgsberg7f37c422007-02-06 14:49:34 -0500860 struct sbp2_login_response response;
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200861 int generation, node_id, local_node_id;
Kristian Høgsberg7f37c422007-02-06 14:49:34 -0500862
Stefan Richterbe6f48b2008-01-27 19:14:44 +0100863 if (fw_device_is_shutdown(device))
864 goto out;
865
Stefan Richter5a8a1bc2008-01-24 01:53:19 +0100866 generation = device->generation;
Stefan Richterb5d2a5e2008-01-25 18:57:41 +0100867 smp_rmb(); /* node_id must not be older than generation */
Stefan Richter5a8a1bc2008-01-24 01:53:19 +0100868 node_id = device->node_id;
869 local_node_id = device->card->node_id;
Kristian Høgsberg7f37c422007-02-06 14:49:34 -0500870
Stefan Richterce896d92008-02-03 23:11:39 +0100871 /* If this is a re-login attempt, log out, or we might be rejected. */
Stefan Richterf8436152008-02-26 23:30:02 +0100872 if (lu->has_sdev)
Stefan Richterce896d92008-02-03 23:11:39 +0100873 sbp2_send_management_orb(lu, device->node_id, generation,
874 SBP2_LOGOUT_REQUEST, lu->login_id, NULL);
875
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200876 if (sbp2_send_management_orb(lu, node_id, generation,
877 SBP2_LOGIN_REQUEST, lu->lun, &response) < 0) {
Stefan Richter2e2705b2008-02-16 16:37:28 +0100878 if (lu->retries++ < 5) {
Stefan Richter285838e2007-11-07 01:12:51 +0100879 sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5));
Stefan Richter2e2705b2008-02-16 16:37:28 +0100880 } else {
Stefan Richter48f18c72008-02-03 23:09:50 +0100881 fw_error("%s: failed to login to LUN %04x\n",
882 tgt->bus_id, lu->lun);
Stefan Richter2e2705b2008-02-16 16:37:28 +0100883 /* Let any waiting I/O fail from now on. */
884 sbp2_unblock(lu->tgt);
885 }
Stefan Richter285838e2007-11-07 01:12:51 +0100886 goto out;
Kristian Høgsberg7f37c422007-02-06 14:49:34 -0500887 }
888
Stefan Richter48f18c72008-02-03 23:09:50 +0100889 tgt->node_id = node_id;
890 tgt->address_high = local_node_id << 16;
Stefan Richter2e2705b2008-02-16 16:37:28 +0100891 sbp2_set_generation(lu, generation);
Kristian Høgsberg7f37c422007-02-06 14:49:34 -0500892
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200893 lu->command_block_agent_address =
Stefan Richter71ee9f02008-02-28 20:51:11 +0100894 ((u64)(be32_to_cpu(response.command_block_agent.high) & 0xffff)
895 << 32) | be32_to_cpu(response.command_block_agent.low);
896 lu->login_id = be32_to_cpu(response.misc) & 0xffff;
Kristian Høgsberg7f37c422007-02-06 14:49:34 -0500897
Stefan Richter48f18c72008-02-03 23:09:50 +0100898 fw_notify("%s: logged in to LUN %04x (%d retries)\n",
899 tgt->bus_id, lu->lun, lu->retries);
Kristian Høgsberg7f37c422007-02-06 14:49:34 -0500900
Jarod Wilson51f9dbe2008-03-07 01:43:01 -0500901 /* set appropriate retry limit(s) in BUSY_TIMEOUT register */
902 sbp2_set_busy_timeout(lu);
Kristian Høgsberg7f37c422007-02-06 14:49:34 -0500903
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200904 PREPARE_DELAYED_WORK(&lu->work, sbp2_reconnect);
905 sbp2_agent_reset(lu);
Kristian Høgsberg7f37c422007-02-06 14:49:34 -0500906
Stefan Richter0fa6dfd2008-02-03 23:10:47 +0100907 /* This was a re-login. */
Stefan Richterf8436152008-02-26 23:30:02 +0100908 if (lu->has_sdev) {
Stefan Richter0fa6dfd2008-02-03 23:10:47 +0100909 sbp2_cancel_orbs(lu);
Stefan Richter2e2705b2008-02-16 16:37:28 +0100910 sbp2_conditionally_unblock(lu);
Stefan Richter0fa6dfd2008-02-03 23:10:47 +0100911 goto out;
912 }
913
Stefan Richter9220f192008-02-03 23:04:38 +0100914 if (lu->tgt->workarounds & SBP2_WORKAROUND_DELAY_INQUIRY)
915 ssleep(SBP2_INQUIRY_DELAY);
916
Stefan Richter48f18c72008-02-03 23:09:50 +0100917 shost = container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
Stefan Richterf8436152008-02-26 23:30:02 +0100918 sdev = __scsi_add_device(shost, 0, 0, sbp2_lun2int(lu->lun), lu);
Stefan Richtere80de372008-02-15 21:29:02 +0100919 /*
920 * FIXME: We are unable to perform reconnects while in sbp2_login().
921 * Therefore __scsi_add_device() will get into trouble if a bus reset
922 * happens in parallel. It will either fail or leave us with an
923 * unusable sdev. As a workaround we check for this and retry the
924 * whole login and SCSI probing.
925 */
Stefan Richter1b9c12b2008-01-26 17:43:23 +0100926
Stefan Richtere80de372008-02-15 21:29:02 +0100927 /* Reported error during __scsi_add_device() */
928 if (IS_ERR(sdev))
929 goto out_logout_login;
930
Stefan Richtere80de372008-02-15 21:29:02 +0100931 /* Unreported error during __scsi_add_device() */
932 smp_rmb(); /* get current card generation */
933 if (generation != device->card->generation) {
934 scsi_remove_device(sdev);
Stefan Richter33f1c6c32008-02-19 09:05:49 +0100935 scsi_device_put(sdev);
Stefan Richtere80de372008-02-15 21:29:02 +0100936 goto out_logout_login;
Kristian Høgsberg7f37c422007-02-06 14:49:34 -0500937 }
Stefan Richtere80de372008-02-15 21:29:02 +0100938
939 /* No error during __scsi_add_device() */
Stefan Richterf8436152008-02-26 23:30:02 +0100940 lu->has_sdev = true;
941 scsi_device_put(sdev);
Stefan Richter2e2705b2008-02-16 16:37:28 +0100942 sbp2_allow_block(lu);
Stefan Richtere80de372008-02-15 21:29:02 +0100943 goto out;
944
945 out_logout_login:
946 smp_rmb(); /* generation may have changed */
947 generation = device->generation;
948 smp_rmb(); /* node_id must not be older than generation */
949
950 sbp2_send_management_orb(lu, device->node_id, generation,
951 SBP2_LOGOUT_REQUEST, lu->login_id, NULL);
952 /*
953 * If a bus reset happened, sbp2_update will have requeued
954 * lu->work already. Reset the work from reconnect to login.
955 */
956 PREPARE_DELAYED_WORK(&lu->work, sbp2_login);
Stefan Richter285838e2007-11-07 01:12:51 +0100957 out:
Stefan Richter48f18c72008-02-03 23:09:50 +0100958 sbp2_target_put(tgt);
Kristian Høgsberg7f37c422007-02-06 14:49:34 -0500959}
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -0500960
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200961static int sbp2_add_logical_unit(struct sbp2_target *tgt, int lun_entry)
962{
963 struct sbp2_logical_unit *lu;
964
965 lu = kmalloc(sizeof(*lu), GFP_KERNEL);
966 if (!lu)
967 return -ENOMEM;
968
969 lu->address_handler.length = 0x100;
970 lu->address_handler.address_callback = sbp2_status_write;
971 lu->address_handler.callback_data = lu;
972
973 if (fw_core_add_address_handler(&lu->address_handler,
974 &fw_high_memory_region) < 0) {
975 kfree(lu);
976 return -ENOMEM;
977 }
978
Stefan Richterf8436152008-02-26 23:30:02 +0100979 lu->tgt = tgt;
980 lu->lun = lun_entry & 0xffff;
981 lu->retries = 0;
982 lu->has_sdev = false;
983 lu->blocked = false;
Stefan Richter2e2705b2008-02-16 16:37:28 +0100984 ++tgt->dont_block;
Stefan Richter5a3c2be2007-08-25 14:05:28 +0200985 INIT_LIST_HEAD(&lu->orb_list);
986 INIT_DELAYED_WORK(&lu->work, sbp2_login);
987
988 list_add_tail(&lu->link, &tgt->lu_list);
989 return 0;
990}
991
992static int sbp2_scan_logical_unit_dir(struct sbp2_target *tgt, u32 *directory)
993{
994 struct fw_csr_iterator ci;
995 int key, value;
996
997 fw_csr_iterator_init(&ci, directory);
998 while (fw_csr_iterator_next(&ci, &key, &value))
999 if (key == SBP2_CSR_LOGICAL_UNIT_NUMBER &&
1000 sbp2_add_logical_unit(tgt, value) < 0)
1001 return -ENOMEM;
1002 return 0;
1003}
1004
1005static int sbp2_scan_unit_dir(struct sbp2_target *tgt, u32 *directory,
1006 u32 *model, u32 *firmware_revision)
1007{
1008 struct fw_csr_iterator ci;
1009 int key, value;
Jarod Wilson384170d2008-01-25 23:31:12 -05001010 unsigned int timeout;
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001011
1012 fw_csr_iterator_init(&ci, directory);
1013 while (fw_csr_iterator_next(&ci, &key, &value)) {
1014 switch (key) {
1015
1016 case CSR_DEPENDENT_INFO | CSR_OFFSET:
1017 tgt->management_agent_address =
1018 CSR_REGISTER_BASE + 4 * value;
1019 break;
1020
1021 case CSR_DIRECTORY_ID:
1022 tgt->directory_id = value;
1023 break;
1024
1025 case CSR_MODEL:
1026 *model = value;
1027 break;
1028
1029 case SBP2_CSR_FIRMWARE_REVISION:
1030 *firmware_revision = value;
1031 break;
1032
Jarod Wilson384170d2008-01-25 23:31:12 -05001033 case SBP2_CSR_UNIT_CHARACTERISTICS:
1034 /* the timeout value is stored in 500ms units */
1035 timeout = ((unsigned int) value >> 8 & 0xff) * 500;
1036 timeout = max(timeout, SBP2_MIN_LOGIN_ORB_TIMEOUT);
1037 tgt->mgt_orb_timeout =
1038 min(timeout, SBP2_MAX_LOGIN_ORB_TIMEOUT);
1039
1040 if (timeout > tgt->mgt_orb_timeout)
1041 fw_notify("%s: config rom contains %ds "
1042 "management ORB timeout, limiting "
Stefan Richter48f18c72008-02-03 23:09:50 +01001043 "to %ds\n", tgt->bus_id,
Jarod Wilson384170d2008-01-25 23:31:12 -05001044 timeout / 1000,
1045 tgt->mgt_orb_timeout / 1000);
1046 break;
1047
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001048 case SBP2_CSR_LOGICAL_UNIT_NUMBER:
1049 if (sbp2_add_logical_unit(tgt, value) < 0)
1050 return -ENOMEM;
1051 break;
1052
1053 case SBP2_CSR_LOGICAL_UNIT_DIRECTORY:
Richard Sharpe0e3e2ea2008-06-24 19:11:13 -07001054 /* Adjust for the increment in the iterator */
1055 if (sbp2_scan_logical_unit_dir(tgt, ci.p - 1 + value) < 0)
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001056 return -ENOMEM;
1057 break;
1058 }
1059 }
1060 return 0;
1061}
1062
1063static void sbp2_init_workarounds(struct sbp2_target *tgt, u32 model,
1064 u32 firmware_revision)
1065{
1066 int i;
Stefan Richter05cca7382008-01-26 17:42:45 +01001067 unsigned int w = sbp2_param_workarounds;
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001068
Stefan Richter2df222b2007-08-13 17:48:25 +02001069 if (w)
1070 fw_notify("Please notify linux1394-devel@lists.sourceforge.net "
1071 "if you need the workarounds parameter for %s\n",
Stefan Richter48f18c72008-02-03 23:09:50 +01001072 tgt->bus_id);
Stefan Richter2df222b2007-08-13 17:48:25 +02001073
1074 if (w & SBP2_WORKAROUND_OVERRIDE)
1075 goto out;
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001076
1077 for (i = 0; i < ARRAY_SIZE(sbp2_workarounds_table); i++) {
1078
1079 if (sbp2_workarounds_table[i].firmware_revision !=
1080 (firmware_revision & 0xffffff00))
1081 continue;
1082
1083 if (sbp2_workarounds_table[i].model != model &&
1084 sbp2_workarounds_table[i].model != ~0)
1085 continue;
1086
Stefan Richter2df222b2007-08-13 17:48:25 +02001087 w |= sbp2_workarounds_table[i].workarounds;
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001088 break;
1089 }
Stefan Richter2df222b2007-08-13 17:48:25 +02001090 out:
1091 if (w)
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001092 fw_notify("Workarounds for %s: 0x%x "
1093 "(firmware_revision 0x%06x, model_id 0x%06x)\n",
Stefan Richter48f18c72008-02-03 23:09:50 +01001094 tgt->bus_id, w, firmware_revision, model);
Stefan Richter2df222b2007-08-13 17:48:25 +02001095 tgt->workarounds = w;
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001096}
1097
1098static struct scsi_host_template scsi_driver_template;
1099
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001100static int sbp2_probe(struct device *dev)
1101{
1102 struct fw_unit *unit = fw_unit(dev);
1103 struct fw_device *device = fw_device(unit->device.parent);
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001104 struct sbp2_target *tgt;
1105 struct sbp2_logical_unit *lu;
1106 struct Scsi_Host *shost;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001107 u32 model, firmware_revision;
1108
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001109 shost = scsi_host_alloc(&scsi_driver_template, sizeof(*tgt));
1110 if (shost == NULL)
1111 return -ENOMEM;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001112
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001113 tgt = (struct sbp2_target *)shost->hostdata;
1114 unit->device.driver_data = tgt;
1115 tgt->unit = unit;
1116 kref_init(&tgt->kref);
1117 INIT_LIST_HEAD(&tgt->lu_list);
Stefan Richter48f18c72008-02-03 23:09:50 +01001118 tgt->bus_id = unit->device.bus_id;
Stefan Richterc9755e12008-03-24 20:54:28 +01001119 tgt->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001120
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001121 if (fw_device_enable_phys_dma(device) < 0)
1122 goto fail_shost_put;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001123
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001124 if (scsi_add_host(shost, &unit->device) < 0)
1125 goto fail_shost_put;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001126
Stefan Richter855c6032008-02-27 22:14:27 +01001127 fw_device_get(device);
Stefan Richter1dc3bea2008-02-24 19:01:21 +01001128 fw_unit_get(unit);
Stefan Richter855c6032008-02-27 22:14:27 +01001129
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001130 /* Initialize to values that won't match anything in our table. */
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001131 firmware_revision = 0xff000000;
1132 model = 0xff000000;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001133
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001134 /* implicit directory ID */
1135 tgt->directory_id = ((unit->directory - device->config_rom) * 4
1136 + CSR_CONFIG_ROM) & 0xffffff;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001137
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001138 if (sbp2_scan_unit_dir(tgt, unit->directory, &model,
1139 &firmware_revision) < 0)
1140 goto fail_tgt_put;
1141
1142 sbp2_init_workarounds(tgt, model, firmware_revision);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001143
Stefan Richter285838e2007-11-07 01:12:51 +01001144 /* Do the login in a workqueue so we can easily reschedule retries. */
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001145 list_for_each_entry(lu, &tgt->lu_list, link)
Stefan Richter285838e2007-11-07 01:12:51 +01001146 sbp2_queue_work(lu, 0);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001147 return 0;
Kristian Høgsbergad852742007-05-09 19:23:07 -04001148
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001149 fail_tgt_put:
Stefan Richter285838e2007-11-07 01:12:51 +01001150 sbp2_target_put(tgt);
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001151 return -ENOMEM;
1152
1153 fail_shost_put:
1154 scsi_host_put(shost);
1155 return -ENOMEM;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001156}
1157
1158static int sbp2_remove(struct device *dev)
1159{
1160 struct fw_unit *unit = fw_unit(dev);
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001161 struct sbp2_target *tgt = unit->device.driver_data;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001162
Stefan Richter285838e2007-11-07 01:12:51 +01001163 sbp2_target_put(tgt);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001164 return 0;
1165}
1166
1167static void sbp2_reconnect(struct work_struct *work)
1168{
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001169 struct sbp2_logical_unit *lu =
1170 container_of(work, struct sbp2_logical_unit, work.work);
Stefan Richter48f18c72008-02-03 23:09:50 +01001171 struct sbp2_target *tgt = lu->tgt;
1172 struct fw_device *device = fw_device(tgt->unit->device.parent);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001173 int generation, node_id, local_node_id;
1174
Stefan Richterbe6f48b2008-01-27 19:14:44 +01001175 if (fw_device_is_shutdown(device))
1176 goto out;
1177
Stefan Richter5a8a1bc2008-01-24 01:53:19 +01001178 generation = device->generation;
Stefan Richterb5d2a5e2008-01-25 18:57:41 +01001179 smp_rmb(); /* node_id must not be older than generation */
Stefan Richter5a8a1bc2008-01-24 01:53:19 +01001180 node_id = device->node_id;
1181 local_node_id = device->card->node_id;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001182
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001183 if (sbp2_send_management_orb(lu, node_id, generation,
Kristian Høgsberg7f37c422007-02-06 14:49:34 -05001184 SBP2_RECONNECT_REQUEST,
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001185 lu->login_id, NULL) < 0) {
Stefan Richterce896d92008-02-03 23:11:39 +01001186 /*
1187 * If reconnect was impossible even though we are in the
1188 * current generation, fall back and try to log in again.
1189 *
1190 * We could check for "Function rejected" status, but
1191 * looking at the bus generation as simpler and more general.
1192 */
1193 smp_rmb(); /* get current card generation */
1194 if (generation == device->card->generation ||
1195 lu->retries++ >= 5) {
Stefan Richter48f18c72008-02-03 23:09:50 +01001196 fw_error("%s: failed to reconnect\n", tgt->bus_id);
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001197 lu->retries = 0;
1198 PREPARE_DELAYED_WORK(&lu->work, sbp2_login);
Kristian Høgsberg7f37c422007-02-06 14:49:34 -05001199 }
Stefan Richter285838e2007-11-07 01:12:51 +01001200 sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5));
1201 goto out;
Kristian Høgsberg7f37c422007-02-06 14:49:34 -05001202 }
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001203
Stefan Richter48f18c72008-02-03 23:09:50 +01001204 tgt->node_id = node_id;
1205 tgt->address_high = local_node_id << 16;
Stefan Richter2e2705b2008-02-16 16:37:28 +01001206 sbp2_set_generation(lu, generation);
Kristian Høgsberg7f37c422007-02-06 14:49:34 -05001207
Stefan Richter48f18c72008-02-03 23:09:50 +01001208 fw_notify("%s: reconnected to LUN %04x (%d retries)\n",
1209 tgt->bus_id, lu->lun, lu->retries);
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001210
1211 sbp2_agent_reset(lu);
1212 sbp2_cancel_orbs(lu);
Stefan Richter2e2705b2008-02-16 16:37:28 +01001213 sbp2_conditionally_unblock(lu);
Stefan Richter285838e2007-11-07 01:12:51 +01001214 out:
Stefan Richter48f18c72008-02-03 23:09:50 +01001215 sbp2_target_put(tgt);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001216}
1217
1218static void sbp2_update(struct fw_unit *unit)
1219{
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001220 struct sbp2_target *tgt = unit->device.driver_data;
1221 struct sbp2_logical_unit *lu;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001222
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001223 fw_device_enable_phys_dma(fw_device(unit->device.parent));
1224
1225 /*
1226 * Fw-core serializes sbp2_update() against sbp2_remove().
1227 * Iteration over tgt->lu_list is therefore safe here.
1228 */
1229 list_for_each_entry(lu, &tgt->lu_list, link) {
Stefan Richter2e2705b2008-02-16 16:37:28 +01001230 sbp2_conditionally_block(lu);
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001231 lu->retries = 0;
Stefan Richter285838e2007-11-07 01:12:51 +01001232 sbp2_queue_work(lu, 0);
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001233 }
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001234}
1235
1236#define SBP2_UNIT_SPEC_ID_ENTRY 0x0000609e
1237#define SBP2_SW_VERSION_ENTRY 0x00010483
1238
Stefan Richter21ebcd12007-01-14 15:29:07 +01001239static const struct fw_device_id sbp2_id_table[] = {
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001240 {
1241 .match_flags = FW_MATCH_SPECIFIER_ID | FW_MATCH_VERSION,
1242 .specifier_id = SBP2_UNIT_SPEC_ID_ENTRY,
Stefan Richter5af4e5e2007-01-21 20:45:32 +01001243 .version = SBP2_SW_VERSION_ENTRY,
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001244 },
1245 { }
1246};
1247
1248static struct fw_driver sbp2_driver = {
1249 .driver = {
1250 .owner = THIS_MODULE,
1251 .name = sbp2_driver_name,
1252 .bus = &fw_bus_type,
1253 .probe = sbp2_probe,
1254 .remove = sbp2_remove,
1255 },
1256 .update = sbp2_update,
1257 .id_table = sbp2_id_table,
1258};
1259
Kristian Høgsbergfbb54232007-04-10 18:11:18 -04001260static unsigned int
1261sbp2_status_to_sense_data(u8 *sbp2_status, u8 *sense_data)
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001262{
Kristian Høgsbergfbb54232007-04-10 18:11:18 -04001263 int sam_status;
1264
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001265 sense_data[0] = 0x70;
1266 sense_data[1] = 0x0;
1267 sense_data[2] = sbp2_status[1];
1268 sense_data[3] = sbp2_status[4];
1269 sense_data[4] = sbp2_status[5];
1270 sense_data[5] = sbp2_status[6];
1271 sense_data[6] = sbp2_status[7];
1272 sense_data[7] = 10;
1273 sense_data[8] = sbp2_status[8];
1274 sense_data[9] = sbp2_status[9];
1275 sense_data[10] = sbp2_status[10];
1276 sense_data[11] = sbp2_status[11];
1277 sense_data[12] = sbp2_status[2];
1278 sense_data[13] = sbp2_status[3];
1279 sense_data[14] = sbp2_status[12];
1280 sense_data[15] = sbp2_status[13];
1281
Kristian Høgsbergfbb54232007-04-10 18:11:18 -04001282 sam_status = sbp2_status[0] & 0x3f;
1283
1284 switch (sam_status) {
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001285 case SAM_STAT_GOOD:
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001286 case SAM_STAT_CHECK_CONDITION:
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001287 case SAM_STAT_CONDITION_MET:
Kristian Høgsbergfbb54232007-04-10 18:11:18 -04001288 case SAM_STAT_BUSY:
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001289 case SAM_STAT_RESERVATION_CONFLICT:
1290 case SAM_STAT_COMMAND_TERMINATED:
Kristian Høgsbergfbb54232007-04-10 18:11:18 -04001291 return DID_OK << 16 | sam_status;
1292
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001293 default:
Kristian Høgsbergfbb54232007-04-10 18:11:18 -04001294 return DID_ERROR << 16;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001295 }
1296}
1297
1298static void
1299complete_command_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
1300{
Jay Fenlason6f061482007-06-27 16:04:33 -04001301 struct sbp2_command_orb *orb =
1302 container_of(base_orb, struct sbp2_command_orb, base);
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001303 struct fw_device *device = fw_device(orb->lu->tgt->unit->device.parent);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001304 int result;
1305
1306 if (status != NULL) {
Kristian Høgsberga77754a2007-05-07 20:33:35 -04001307 if (STATUS_GET_DEAD(*status))
Stefan Richtere0e60212008-02-03 23:08:58 +01001308 sbp2_agent_reset_no_wait(orb->lu);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001309
Kristian Høgsberga77754a2007-05-07 20:33:35 -04001310 switch (STATUS_GET_RESPONSE(*status)) {
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001311 case SBP2_STATUS_REQUEST_COMPLETE:
Kristian Høgsbergfbb54232007-04-10 18:11:18 -04001312 result = DID_OK << 16;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001313 break;
1314 case SBP2_STATUS_TRANSPORT_FAILURE:
Kristian Høgsbergfbb54232007-04-10 18:11:18 -04001315 result = DID_BUS_BUSY << 16;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001316 break;
1317 case SBP2_STATUS_ILLEGAL_REQUEST:
1318 case SBP2_STATUS_VENDOR_DEPENDENT:
1319 default:
Kristian Høgsbergfbb54232007-04-10 18:11:18 -04001320 result = DID_ERROR << 16;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001321 break;
1322 }
1323
Kristian Høgsberga77754a2007-05-07 20:33:35 -04001324 if (result == DID_OK << 16 && STATUS_GET_LEN(*status) > 1)
1325 result = sbp2_status_to_sense_data(STATUS_GET_DATA(*status),
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001326 orb->cmd->sense_buffer);
1327 } else {
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001328 /*
1329 * If the orb completes with status == NULL, something
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001330 * went wrong, typically a bus reset happened mid-orb
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001331 * or when sending the write (less likely).
1332 */
Kristian Høgsbergfbb54232007-04-10 18:11:18 -04001333 result = DID_BUS_BUSY << 16;
Stefan Richter2e2705b2008-02-16 16:37:28 +01001334 sbp2_conditionally_block(orb->lu);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001335 }
1336
1337 dma_unmap_single(device->card->device, orb->base.request_bus,
Kristian Høgsberg2d826cc2007-05-09 19:23:14 -04001338 sizeof(orb->request), DMA_TO_DEVICE);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001339
Stefan Richter412edf62007-07-16 21:05:41 +02001340 if (scsi_sg_count(orb->cmd) > 0)
1341 dma_unmap_sg(device->card->device, scsi_sglist(orb->cmd),
1342 scsi_sg_count(orb->cmd),
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001343 orb->cmd->sc_data_direction);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001344
1345 if (orb->page_table_bus != 0)
1346 dma_unmap_single(device->card->device, orb->page_table_bus,
Stefan Richterb4be0162007-07-02 22:07:34 +02001347 sizeof(orb->page_table), DMA_TO_DEVICE);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001348
Kristian Høgsbergfbb54232007-04-10 18:11:18 -04001349 orb->cmd->result = result;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001350 orb->done(orb->cmd);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001351}
1352
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001353static int
1354sbp2_map_scatterlist(struct sbp2_command_orb *orb, struct fw_device *device,
1355 struct sbp2_logical_unit *lu)
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001356{
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001357 struct scatterlist *sg;
1358 int sg_len, l, i, j, count;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001359 dma_addr_t sg_addr;
1360
Stefan Richter412edf62007-07-16 21:05:41 +02001361 sg = scsi_sglist(orb->cmd);
1362 count = dma_map_sg(device->card->device, sg, scsi_sg_count(orb->cmd),
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001363 orb->cmd->sc_data_direction);
Kristian Høgsberg95ffc5e2007-05-09 19:23:08 -04001364 if (count == 0)
1365 goto fail;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001366
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001367 /*
1368 * Handle the special case where there is only one element in
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001369 * the scatter list by converting it to an immediate block
1370 * request. This is also a workaround for broken devices such
1371 * as the second generation iPod which doesn't support page
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001372 * tables.
1373 */
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001374 if (count == 1 && sg_dma_len(sg) < SBP2_MAX_SG_ELEMENT_LENGTH) {
Stefan Richter71ee9f02008-02-28 20:51:11 +01001375 orb->request.data_descriptor.high =
1376 cpu_to_be32(lu->tgt->address_high);
1377 orb->request.data_descriptor.low =
1378 cpu_to_be32(sg_dma_address(sg));
1379 orb->request.misc |=
1380 cpu_to_be32(COMMAND_ORB_DATA_SIZE(sg_dma_len(sg)));
Kristian Høgsberg95ffc5e2007-05-09 19:23:08 -04001381 return 0;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001382 }
1383
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001384 /*
1385 * Convert the scatterlist to an sbp2 page table. If any
Kristian Høgsberg, Stefan Richter36abb3b2007-05-09 19:23:10 -04001386 * scatterlist entries are too big for sbp2, we split them as we
1387 * go. Even if we ask the block I/O layer to not give us sg
1388 * elements larger than 65535 bytes, some IOMMUs may merge sg elements
1389 * during DMA mapping, and Linux currently doesn't prevent this.
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001390 */
Stefan Richterb7811da2008-01-15 21:10:50 +01001391 for (i = 0, j = 0; i < count; i++, sg = sg_next(sg)) {
1392 sg_len = sg_dma_len(sg);
1393 sg_addr = sg_dma_address(sg);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001394 while (sg_len) {
Stefan Richter332ef332007-07-01 13:56:03 +02001395 /* FIXME: This won't get us out of the pinch. */
1396 if (unlikely(j >= ARRAY_SIZE(orb->page_table))) {
1397 fw_error("page table overflow\n");
1398 goto fail_page_table;
1399 }
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001400 l = min(sg_len, SBP2_MAX_SG_ELEMENT_LENGTH);
Stefan Richter71ee9f02008-02-28 20:51:11 +01001401 orb->page_table[j].low = cpu_to_be32(sg_addr);
1402 orb->page_table[j].high = cpu_to_be32(l << 16);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001403 sg_addr += l;
1404 sg_len -= l;
1405 j++;
1406 }
1407 }
1408
Stefan Richterb4be0162007-07-02 22:07:34 +02001409 orb->page_table_bus =
1410 dma_map_single(device->card->device, orb->page_table,
1411 sizeof(orb->page_table), DMA_TO_DEVICE);
1412 if (dma_mapping_error(orb->page_table_bus))
1413 goto fail_page_table;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001414
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001415 /*
1416 * The data_descriptor pointer is the one case where we need
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001417 * to fill in the node ID part of the address. All other
1418 * pointers assume that the data referenced reside on the
1419 * initiator (i.e. us), but data_descriptor can refer to data
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001420 * on other nodes so we need to put our ID in descriptor.high.
1421 */
Stefan Richter71ee9f02008-02-28 20:51:11 +01001422 orb->request.data_descriptor.high = cpu_to_be32(lu->tgt->address_high);
1423 orb->request.data_descriptor.low = cpu_to_be32(orb->page_table_bus);
1424 orb->request.misc |= cpu_to_be32(COMMAND_ORB_PAGE_TABLE_PRESENT |
1425 COMMAND_ORB_DATA_SIZE(j));
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001426
Kristian Høgsberg95ffc5e2007-05-09 19:23:08 -04001427 return 0;
1428
1429 fail_page_table:
Stefan Richter412edf62007-07-16 21:05:41 +02001430 dma_unmap_sg(device->card->device, sg, scsi_sg_count(orb->cmd),
Kristian Høgsberg95ffc5e2007-05-09 19:23:08 -04001431 orb->cmd->sc_data_direction);
1432 fail:
1433 return -ENOMEM;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001434}
1435
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001436/* SCSI stack integration */
1437
1438static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
1439{
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001440 struct sbp2_logical_unit *lu = cmd->device->hostdata;
1441 struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001442 struct sbp2_command_orb *orb;
Stefan Richter05cca7382008-01-26 17:42:45 +01001443 unsigned int max_payload;
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001444 int retval = SCSI_MLQUEUE_HOST_BUSY;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001445
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001446 /*
1447 * Bidirectional commands are not yet implemented, and unknown
1448 * transfer direction not handled.
1449 */
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001450 if (cmd->sc_data_direction == DMA_BIDIRECTIONAL) {
Stefan Richter8a8cea22007-06-09 19:26:22 +02001451 fw_error("Can't handle DMA_BIDIRECTIONAL, rejecting command\n");
Kristian Høgsberge1b68c42007-05-09 19:23:09 -04001452 cmd->result = DID_ERROR << 16;
1453 done(cmd);
1454 return 0;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001455 }
1456
Kristian Høgsberg2d826cc2007-05-09 19:23:14 -04001457 orb = kzalloc(sizeof(*orb), GFP_ATOMIC);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001458 if (orb == NULL) {
1459 fw_notify("failed to alloc orb\n");
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001460 return SCSI_MLQUEUE_HOST_BUSY;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001461 }
1462
Kristian Høgsberg12f26aa2007-04-10 18:11:20 -04001463 /* Initialize rcode to something not RCODE_COMPLETE. */
1464 orb->base.rcode = -1;
Kristian Høgsberge57d2012007-08-24 18:59:58 -04001465 kref_init(&orb->base.kref);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001466
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001467 orb->lu = lu;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001468 orb->done = done;
1469 orb->cmd = cmd;
1470
Stefan Richter71ee9f02008-02-28 20:51:11 +01001471 orb->request.next.high = cpu_to_be32(SBP2_ORB_NULL);
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001472 /*
1473 * At speed 100 we can do 512 bytes per packet, at speed 200,
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001474 * 1024 bytes per packet etc. The SBP-2 max_payload field
1475 * specifies the max payload size as 2 ^ (max_payload + 2), so
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001476 * if we set this to max_speed + 7, we get the right value.
1477 */
Stefan Richter25659f72007-07-21 22:43:05 +02001478 max_payload = min(device->max_speed + 7,
1479 device->card->max_receive - 1);
Stefan Richter71ee9f02008-02-28 20:51:11 +01001480 orb->request.misc = cpu_to_be32(
Stefan Richter25659f72007-07-21 22:43:05 +02001481 COMMAND_ORB_MAX_PAYLOAD(max_payload) |
Stefan Richterf1397492007-06-10 21:31:36 +02001482 COMMAND_ORB_SPEED(device->max_speed) |
Stefan Richter71ee9f02008-02-28 20:51:11 +01001483 COMMAND_ORB_NOTIFY);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001484
1485 if (cmd->sc_data_direction == DMA_FROM_DEVICE)
Stefan Richter0d7dcbf2008-02-28 20:52:02 +01001486 orb->request.misc |= cpu_to_be32(COMMAND_ORB_DIRECTION);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001487
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001488 if (scsi_sg_count(cmd) && sbp2_map_scatterlist(orb, device, lu) < 0)
1489 goto out;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001490
Boaz Harrosh64a87b22008-04-30 11:19:47 +03001491 memcpy(orb->request.command_block, cmd->cmnd, cmd->cmd_len);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001492
1493 orb->base.callback = complete_command_orb;
Stefan Richter85263922007-07-02 21:04:08 +02001494 orb->base.request_bus =
1495 dma_map_single(device->card->device, &orb->request,
1496 sizeof(orb->request), DMA_TO_DEVICE);
1497 if (dma_mapping_error(orb->base.request_bus))
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001498 goto out;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001499
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001500 sbp2_send_orb(&orb->base, lu, lu->tgt->node_id, lu->generation,
1501 lu->command_block_agent_address + SBP2_ORB_POINTER);
1502 retval = 0;
1503 out:
Kristian Høgsberge57d2012007-08-24 18:59:58 -04001504 kref_put(&orb->base.kref, free_orb);
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001505 return retval;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001506}
1507
Stefan Richtercfb01382007-01-23 21:20:08 +01001508static int sbp2_scsi_slave_alloc(struct scsi_device *sdev)
1509{
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001510 struct sbp2_logical_unit *lu = sdev->hostdata;
Stefan Richtercfb01382007-01-23 21:20:08 +01001511
Stefan Richter5513c5f2008-02-17 14:56:19 +01001512 /* (Re-)Adding logical units via the SCSI stack is not supported. */
1513 if (!lu)
1514 return -ENOSYS;
1515
Stefan Richtercfb01382007-01-23 21:20:08 +01001516 sdev->allow_restart = 1;
1517
Stefan Richter8ac3a472008-01-27 22:31:27 +01001518 /* SBP-2 requires quadlet alignment of the data buffers. */
1519 blk_queue_update_dma_alignment(sdev->request_queue, 4 - 1);
James Bottomley465ff312008-01-01 10:00:10 -06001520
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001521 if (lu->tgt->workarounds & SBP2_WORKAROUND_INQUIRY_36)
Stefan Richtercfb01382007-01-23 21:20:08 +01001522 sdev->inquiry_len = 36;
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001523
Stefan Richtercfb01382007-01-23 21:20:08 +01001524 return 0;
1525}
1526
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001527static int sbp2_scsi_slave_configure(struct scsi_device *sdev)
1528{
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001529 struct sbp2_logical_unit *lu = sdev->hostdata;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001530
Stefan Richtercfb01382007-01-23 21:20:08 +01001531 sdev->use_10_for_rw = 1;
1532
1533 if (sdev->type == TYPE_ROM)
1534 sdev->use_10_for_ms = 1;
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001535
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001536 if (sdev->type == TYPE_DISK &&
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001537 lu->tgt->workarounds & SBP2_WORKAROUND_MODE_SENSE_8)
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001538 sdev->skip_ms_page_8 = 1;
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001539
1540 if (lu->tgt->workarounds & SBP2_WORKAROUND_FIX_CAPACITY)
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001541 sdev->fix_capacity = 1;
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001542
1543 if (lu->tgt->workarounds & SBP2_WORKAROUND_128K_MAX_TRANS)
Stefan Richtercf47c7a2007-06-17 23:52:08 +02001544 blk_queue_max_sectors(sdev->request_queue, 128 * 1024 / 512);
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001545
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001546 return 0;
1547}
1548
1549/*
1550 * Called by scsi stack when something has really gone wrong. Usually
1551 * called when a command has timed-out for some reason.
1552 */
1553static int sbp2_scsi_abort(struct scsi_cmnd *cmd)
1554{
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001555 struct sbp2_logical_unit *lu = cmd->device->hostdata;
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001556
Stefan Richter48f18c72008-02-03 23:09:50 +01001557 fw_notify("%s: sbp2_scsi_abort\n", lu->tgt->bus_id);
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001558 sbp2_agent_reset(lu);
1559 sbp2_cancel_orbs(lu);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001560
1561 return SUCCESS;
1562}
1563
Stefan Richter14e21982007-05-27 13:18:27 +02001564/*
1565 * Format of /sys/bus/scsi/devices/.../ieee1394_id:
1566 * u64 EUI-64 : u24 directory_ID : u16 LUN (all printed in hexadecimal)
1567 *
1568 * This is the concatenation of target port identifier and logical unit
1569 * identifier as per SAM-2...SAM-4 annex A.
1570 */
1571static ssize_t
1572sbp2_sysfs_ieee1394_id_show(struct device *dev, struct device_attribute *attr,
1573 char *buf)
1574{
1575 struct scsi_device *sdev = to_scsi_device(dev);
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001576 struct sbp2_logical_unit *lu;
Stefan Richter14e21982007-05-27 13:18:27 +02001577
1578 if (!sdev)
1579 return 0;
Stefan Richter14e21982007-05-27 13:18:27 +02001580
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001581 lu = sdev->hostdata;
Stefan Richter14e21982007-05-27 13:18:27 +02001582
Stefan Richterc9755e12008-03-24 20:54:28 +01001583 return sprintf(buf, "%016llx:%06x:%04x\n",
1584 (unsigned long long)lu->tgt->guid,
Stefan Richter5a3c2be2007-08-25 14:05:28 +02001585 lu->tgt->directory_id, lu->lun);
Stefan Richter14e21982007-05-27 13:18:27 +02001586}
1587
1588static DEVICE_ATTR(ieee1394_id, S_IRUGO, sbp2_sysfs_ieee1394_id_show, NULL);
1589
1590static struct device_attribute *sbp2_scsi_sysfs_attrs[] = {
1591 &dev_attr_ieee1394_id,
1592 NULL
1593};
1594
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001595static struct scsi_host_template scsi_driver_template = {
1596 .module = THIS_MODULE,
1597 .name = "SBP-2 IEEE-1394",
Kristian Høgsbergb02b6bc2007-05-09 19:23:12 -04001598 .proc_name = sbp2_driver_name,
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001599 .queuecommand = sbp2_scsi_queuecommand,
Stefan Richtercfb01382007-01-23 21:20:08 +01001600 .slave_alloc = sbp2_scsi_slave_alloc,
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001601 .slave_configure = sbp2_scsi_slave_configure,
1602 .eh_abort_handler = sbp2_scsi_abort,
1603 .this_id = -1,
1604 .sg_tablesize = SG_ALL,
1605 .use_clustering = ENABLE_CLUSTERING,
Stefan Richter02af8e72007-01-21 20:50:11 +01001606 .cmd_per_lun = 1,
1607 .can_queue = 1,
Stefan Richter14e21982007-05-27 13:18:27 +02001608 .sdev_attrs = sbp2_scsi_sysfs_attrs,
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001609};
1610
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001611MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
1612MODULE_DESCRIPTION("SCSI over IEEE1394");
1613MODULE_LICENSE("GPL");
1614MODULE_DEVICE_TABLE(ieee1394, sbp2_id_table);
1615
Olaf Hering1e4c7b02007-05-05 23:17:13 +02001616/* Provide a module alias so root-on-sbp2 initrds don't break. */
1617#ifndef CONFIG_IEEE1394_SBP2_MODULE
1618MODULE_ALIAS("sbp2");
1619#endif
1620
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001621static int __init sbp2_init(void)
1622{
Stefan Richterdf8ec242007-08-12 12:51:18 +02001623 sbp2_wq = create_singlethread_workqueue(KBUILD_MODNAME);
1624 if (!sbp2_wq)
1625 return -ENOMEM;
1626
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001627 return driver_register(&sbp2_driver.driver);
1628}
1629
1630static void __exit sbp2_cleanup(void)
1631{
1632 driver_unregister(&sbp2_driver.driver);
Stefan Richterdf8ec242007-08-12 12:51:18 +02001633 destroy_workqueue(sbp2_wq);
Kristian Høgsberg9ba136d2006-12-19 19:58:40 -05001634}
1635
1636module_init(sbp2_init);
1637module_exit(sbp2_cleanup);