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ieee1394: set read permission for parameter disable_irm
[linux-2.6-block.git] / drivers / ieee1394 / sbp2.c
CommitLineData
1da177e4
LT		 1/*
2 * sbp2.c - SBP-2 protocol driver for IEEE-1394
3 *
4 * Copyright (C) 2000 James Goodwin, Filanet Corporation (www.filanet.com)
5 * jamesg@filanet.com (JSG)
6 *
7 * Copyright (C) 2003 Ben Collins <bcollins@debian.org>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software Foundation,
21 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 */
23
24/*
25 * Brief Description:
26 *
27 * This driver implements the Serial Bus Protocol 2 (SBP-2) over IEEE-1394
28 * under Linux. The SBP-2 driver is implemented as an IEEE-1394 high-level
29 * driver. It also registers as a SCSI lower-level driver in order to accept
30 * SCSI commands for transport using SBP-2.
31 *
32 * You may access any attached SBP-2 storage devices as if they were SCSI
33 * devices (e.g. mount /dev/sda1, fdisk, mkfs, etc.).
34 *
35 * Current Issues:
36 *
37 * - Error Handling: SCSI aborts and bus reset requests are handled somewhat
38 * but the code needs additional debugging.
39 */
40
41#include <linux/config.h>
42#include <linux/kernel.h>
43#include <linux/list.h>
44#include <linux/string.h>
45#include <linux/slab.h>
46#include <linux/interrupt.h>
47#include <linux/fs.h>
48#include <linux/poll.h>
49#include <linux/module.h>
50#include <linux/moduleparam.h>
51#include <linux/types.h>
52#include <linux/delay.h>
53#include <linux/sched.h>
54#include <linux/blkdev.h>
55#include <linux/smp_lock.h>
56#include <linux/init.h>
57#include <linux/pci.h>
58
59#include <asm/current.h>
60#include <asm/uaccess.h>
61#include <asm/io.h>
62#include <asm/byteorder.h>
63#include <asm/atomic.h>
64#include <asm/system.h>
65#include <asm/scatterlist.h>
66
67#include <scsi/scsi.h>
68#include <scsi/scsi_cmnd.h>
69#include <scsi/scsi_dbg.h>
70#include <scsi/scsi_device.h>
71#include <scsi/scsi_host.h>
72
73#include "csr1212.h"
74#include "ieee1394.h"
75#include "ieee1394_types.h"
76#include "ieee1394_core.h"
77#include "nodemgr.h"
78#include "hosts.h"
79#include "highlevel.h"
80#include "ieee1394_transactions.h"
81#include "sbp2.h"
82
1da177e4
LT		 83/*
84 * Module load parameter definitions
85 */
86
87/*
88 * Change max_speed on module load if you have a bad IEEE-1394
89 * controller that has trouble running 2KB packets at 400mb.
90 *
91 * NOTE: On certain OHCI parts I have seen short packets on async transmit
92 * (probably due to PCI latency/throughput issues with the part). You can
93 * bump down the speed if you are running into problems.
94 */
95static int max_speed = IEEE1394_SPEED_MAX;
96module_param(max_speed, int, 0644);
2bab359a 97MODULE_PARM_DESC(max_speed, "Force max speed (3 = 800mb, 2 = 400mb, 1 = 200mb, 0 = 100mb)");
1da177e4
LT		 98
99/*
100 * Set serialize_io to 1 if you'd like only one scsi command sent
101 * down to us at a time (debugging). This might be necessary for very
102 * badly behaved sbp2 devices.
2bab359a
JM		 103 *
104 * TODO: Make this configurable per device.
1da177e4 105 */
2bab359a 106static int serialize_io = 1;
1da177e4 107module_param(serialize_io, int, 0444);
2bab359a 108MODULE_PARM_DESC(serialize_io, "Serialize I/O coming from scsi drivers (default = 1, faster = 0)");
1da177e4
LT		 109
110/*
111 * Bump up max_sectors if you'd like to support very large sized
112 * transfers. Please note that some older sbp2 bridge chips are broken for
113 * transfers greater or equal to 128KB. Default is a value of 255
114 * sectors, or just under 128KB (at 512 byte sector size). I can note that
115 * the Oxsemi sbp2 chipsets have no problems supporting very large
116 * transfer sizes.
117 */
118static int max_sectors = SBP2_MAX_SECTORS;
119module_param(max_sectors, int, 0444);
120MODULE_PARM_DESC(max_sectors, "Change max sectors per I/O supported (default = 255)");
121
122/*
123 * Exclusive login to sbp2 device? In most cases, the sbp2 driver should
124 * do an exclusive login, as it's generally unsafe to have two hosts
125 * talking to a single sbp2 device at the same time (filesystem coherency,
126 * etc.). If you're running an sbp2 device that supports multiple logins,
127 * and you're either running read-only filesystems or some sort of special
128 * filesystem supporting multiple hosts (one such filesystem is OpenGFS,
129 * see opengfs.sourceforge.net for more info), then set exclusive_login
130 * to zero. Note: The Oxsemi OXFW911 sbp2 chipset supports up to four
131 * concurrent logins.
132 */
133static int exclusive_login = 1;
134module_param(exclusive_login, int, 0644);
135MODULE_PARM_DESC(exclusive_login, "Exclusive login to sbp2 device (default = 1)");
136
137/*
138 * SCSI inquiry hack for really badly behaved sbp2 devices. Turn this on
139 * if your sbp2 device is not properly handling the SCSI inquiry command.
a80614d1
SR		 140 * This hack makes the inquiry look more like a typical MS Windows inquiry
141 * by enforcing 36 byte inquiry and avoiding access to mode_sense page 8.
1da177e4
LT		 142 *
143 * If force_inquiry_hack=1 is required for your device to work,
144 * please submit the logged sbp2_firmware_revision value of this device to
145 * the linux1394-devel mailing list.
146 */
1934b8b6 147static int force_inquiry_hack;
a80614d1 148module_param(force_inquiry_hack, int, 0644);
1da177e4
LT		 149MODULE_PARM_DESC(force_inquiry_hack, "Force SCSI inquiry hack (default = 0)");
150
1da177e4
LT		 151/*
152 * Export information about protocols/devices supported by this driver.
153 */
154static struct ieee1394_device_id sbp2_id_table[] = {
155 {
a237f35f
SR		 156 .match_flags = IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION,
157 .specifier_id = SBP2_UNIT_SPEC_ID_ENTRY & 0xffffff,
158 .version = SBP2_SW_VERSION_ENTRY & 0xffffff},
159 {}
1da177e4
LT		 160};
161
162MODULE_DEVICE_TABLE(ieee1394, sbp2_id_table);
163
164/*
165 * Debug levels, configured via kernel config, or enable here.
166 */
167
44456d37 168#define CONFIG_IEEE1394_SBP2_DEBUG 0
1da177e4
LT		 169/* #define CONFIG_IEEE1394_SBP2_DEBUG_ORBS */
170/* #define CONFIG_IEEE1394_SBP2_DEBUG_DMA */
171/* #define CONFIG_IEEE1394_SBP2_DEBUG 1 */
172/* #define CONFIG_IEEE1394_SBP2_DEBUG 2 */
173/* #define CONFIG_IEEE1394_SBP2_PACKET_DUMP */
174
175#ifdef CONFIG_IEEE1394_SBP2_DEBUG_ORBS
176#define SBP2_ORB_DEBUG(fmt, args...) HPSB_ERR("sbp2(%s): "fmt, __FUNCTION__, ## args)
177static u32 global_outstanding_command_orbs = 0;
178#define outstanding_orb_incr global_outstanding_command_orbs++
179#define outstanding_orb_decr global_outstanding_command_orbs--
180#else
181#define SBP2_ORB_DEBUG(fmt, args...)
182#define outstanding_orb_incr
183#define outstanding_orb_decr
184#endif
185
186#ifdef CONFIG_IEEE1394_SBP2_DEBUG_DMA
187#define SBP2_DMA_ALLOC(fmt, args...) \
188 HPSB_ERR("sbp2(%s)alloc(%d): "fmt, __FUNCTION__, \
189 ++global_outstanding_dmas, ## args)
190#define SBP2_DMA_FREE(fmt, args...) \
191 HPSB_ERR("sbp2(%s)free(%d): "fmt, __FUNCTION__, \
192 --global_outstanding_dmas, ## args)
193static u32 global_outstanding_dmas = 0;
194#else
195#define SBP2_DMA_ALLOC(fmt, args...)
196#define SBP2_DMA_FREE(fmt, args...)
197#endif
198
199#if CONFIG_IEEE1394_SBP2_DEBUG >= 2
200#define SBP2_DEBUG(fmt, args...) HPSB_ERR("sbp2: "fmt, ## args)
201#define SBP2_INFO(fmt, args...) HPSB_ERR("sbp2: "fmt, ## args)
202#define SBP2_NOTICE(fmt, args...) HPSB_ERR("sbp2: "fmt, ## args)
203#define SBP2_WARN(fmt, args...) HPSB_ERR("sbp2: "fmt, ## args)
204#elif CONFIG_IEEE1394_SBP2_DEBUG == 1
205#define SBP2_DEBUG(fmt, args...) HPSB_DEBUG("sbp2: "fmt, ## args)
206#define SBP2_INFO(fmt, args...) HPSB_INFO("sbp2: "fmt, ## args)
207#define SBP2_NOTICE(fmt, args...) HPSB_NOTICE("sbp2: "fmt, ## args)
208#define SBP2_WARN(fmt, args...) HPSB_WARN("sbp2: "fmt, ## args)
209#else
210#define SBP2_DEBUG(fmt, args...)
211#define SBP2_INFO(fmt, args...) HPSB_INFO("sbp2: "fmt, ## args)
212#define SBP2_NOTICE(fmt, args...) HPSB_NOTICE("sbp2: "fmt, ## args)
213#define SBP2_WARN(fmt, args...) HPSB_WARN("sbp2: "fmt, ## args)
214#endif
215
216#define SBP2_ERR(fmt, args...) HPSB_ERR("sbp2: "fmt, ## args)
217
1da177e4
LT		 218/*
219 * Globals
220 */
221
222static void sbp2scsi_complete_all_commands(struct scsi_id_instance_data *scsi_id,
223 u32 status);
224
225static void sbp2scsi_complete_command(struct scsi_id_instance_data *scsi_id,
226 u32 scsi_status, struct scsi_cmnd *SCpnt,
227 void (*done)(struct scsi_cmnd *));
228
229static struct scsi_host_template scsi_driver_template;
230
231static const u8 sbp2_speedto_max_payload[] = { 0x7, 0x8, 0x9, 0xA, 0xB, 0xC };
232
233static void sbp2_host_reset(struct hpsb_host *host);
234
235static int sbp2_probe(struct device *dev);
236static int sbp2_remove(struct device *dev);
237static int sbp2_update(struct unit_directory *ud);
238
239static struct hpsb_highlevel sbp2_highlevel = {
240 .name = SBP2_DEVICE_NAME,
241 .host_reset = sbp2_host_reset,
242};
243
244static struct hpsb_address_ops sbp2_ops = {
245 .write = sbp2_handle_status_write
246};
247
248#ifdef CONFIG_IEEE1394_SBP2_PHYS_DMA
249static struct hpsb_address_ops sbp2_physdma_ops = {
a237f35f
SR		 250 .read = sbp2_handle_physdma_read,
251 .write = sbp2_handle_physdma_write,
1da177e4
LT		 252};
253#endif
254
255static struct hpsb_protocol_driver sbp2_driver = {
256 .name = "SBP2 Driver",
257 .id_table = sbp2_id_table,
258 .update = sbp2_update,
259 .driver = {
260 .name = SBP2_DEVICE_NAME,
261 .bus = &ieee1394_bus_type,
262 .probe = sbp2_probe,
263 .remove = sbp2_remove,
264 },
265};
266
a80614d1
SR		 267/*
268 * List of device firmwares that require the inquiry hack.
269 * Yields a few false positives but did not break other devices so far.
270 */
1da177e4 271static u32 sbp2_broken_inquiry_list[] = {
a80614d1 272 0x00002800, /* Stefan Richter <stefanr@s5r6.in-berlin.de> */
1da177e4
LT		 273 /* DViCO Momobay CX-1 */
274 0x00000200 /* Andreas Plesch <plesch@fas.harvard.edu> */
275 /* QPS Fire DVDBurner */
276};
277
1da177e4
LT		 278/**************************************
279 * General utility functions
280 **************************************/
281
1da177e4
LT		 282#ifndef __BIG_ENDIAN
283/*
284 * Converts a buffer from be32 to cpu byte ordering. Length is in bytes.
285 */
286static __inline__ void sbp2util_be32_to_cpu_buffer(void *buffer, int length)
287{
288 u32 *temp = buffer;
289
290 for (length = (length >> 2); length--; )
291 temp[length] = be32_to_cpu(temp[length]);
292
293 return;
294}
295
296/*
297 * Converts a buffer from cpu to be32 byte ordering. Length is in bytes.
298 */
299static __inline__ void sbp2util_cpu_to_be32_buffer(void *buffer, int length)
300{
301 u32 *temp = buffer;
302
303 for (length = (length >> 2); length--; )
304 temp[length] = cpu_to_be32(temp[length]);
305
306 return;
307}
308#else /* BIG_ENDIAN */
309/* Why waste the cpu cycles? */
310#define sbp2util_be32_to_cpu_buffer(x,y)
311#define sbp2util_cpu_to_be32_buffer(x,y)
312#endif
313
314#ifdef CONFIG_IEEE1394_SBP2_PACKET_DUMP
315/*
316 * Debug packet dump routine. Length is in bytes.
317 */
a237f35f
SR		 318static void sbp2util_packet_dump(void *buffer, int length, char *dump_name,
319 u32 dump_phys_addr)
1da177e4
LT		 320{
321 int i;
322 unsigned char *dump = buffer;
323
324 if (!dump || !length || !dump_name)
325 return;
326
327 if (dump_phys_addr)
328 printk("[%s, 0x%x]", dump_name, dump_phys_addr);
329 else
330 printk("[%s]", dump_name);
331 for (i = 0; i < length; i++) {
332 if (i > 0x3f) {
333 printk("\n ...");
334 break;
335 }
336 if ((i & 0x3) == 0)
337 printk(" ");
338 if ((i & 0xf) == 0)
339 printk("\n ");
a237f35f 340 printk("%02x ", (int)dump[i]);
1da177e4
LT		 341 }
342 printk("\n");
343
344 return;
345}
346#else
347#define sbp2util_packet_dump(w,x,y,z)
348#endif
349
350/*
351 * Goofy routine that basically does a down_timeout function.
352 */
353static int sbp2util_down_timeout(atomic_t *done, int timeout)
354{
355 int i;
356
357 for (i = timeout; (i > 0 && atomic_read(done) == 0); i-= HZ/10) {
358 if (msleep_interruptible(100)) /* 100ms */
a237f35f 359 return 1;
1da177e4 360 }
a237f35f 361 return (i > 0) ? 0 : 1;
1da177e4
LT		 362}
363
364/* Free's an allocated packet */
365static void sbp2_free_packet(struct hpsb_packet *packet)
366{
367 hpsb_free_tlabel(packet);
368 hpsb_free_packet(packet);
369}
370
371/* This is much like hpsb_node_write(), except it ignores the response
372 * subaction and returns immediately. Can be used from interrupts.
373 */
374static int sbp2util_node_write_no_wait(struct node_entry *ne, u64 addr,
a237f35f 375 quadlet_t *buffer, size_t length)
1da177e4
LT		 376{
377 struct hpsb_packet *packet;
378
379 packet = hpsb_make_writepacket(ne->host, ne->nodeid,
380 addr, buffer, length);
a237f35f
SR		 381 if (!packet)
382 return -ENOMEM;
1da177e4 383
a237f35f
SR		 384 hpsb_set_packet_complete_task(packet,
385 (void (*)(void *))sbp2_free_packet,
1da177e4
LT		 386 packet);
387
388 hpsb_node_fill_packet(ne, packet);
389
a237f35f 390 if (hpsb_send_packet(packet) < 0) {
1da177e4
LT		 391 sbp2_free_packet(packet);
392 return -EIO;
393 }
394
395 return 0;
396}
397
398/*
399 * This function is called to create a pool of command orbs used for
400 * command processing. It is called when a new sbp2 device is detected.
401 */
402static int sbp2util_create_command_orb_pool(struct scsi_id_instance_data *scsi_id)
403{
404 struct sbp2scsi_host_info *hi = scsi_id->hi;
405 int i;
406 unsigned long flags, orbs;
407 struct sbp2_command_info *command;
408
409 orbs = serialize_io ? 2 : SBP2_MAX_CMDS;
410
411 spin_lock_irqsave(&scsi_id->sbp2_command_orb_lock, flags);
412 for (i = 0; i < orbs; i++) {
8551158a 413 command = kzalloc(sizeof(*command), GFP_ATOMIC);
1da177e4 414 if (!command) {
a237f35f
SR		 415 spin_unlock_irqrestore(&scsi_id->sbp2_command_orb_lock,
416 flags);
417 return -ENOMEM;
1da177e4 418 }
1da177e4 419 command->command_orb_dma =
a237f35f
SR		 420 pci_map_single(hi->host->pdev, &command->command_orb,
421 sizeof(struct sbp2_command_orb),
422 PCI_DMA_BIDIRECTIONAL);
1da177e4
LT		 423 SBP2_DMA_ALLOC("single command orb DMA");
424 command->sge_dma =
a237f35f
SR		 425 pci_map_single(hi->host->pdev,
426 &command->scatter_gather_element,
427 sizeof(command->scatter_gather_element),
428 PCI_DMA_BIDIRECTIONAL);
1da177e4
LT		 429 SBP2_DMA_ALLOC("scatter_gather_element");
430 INIT_LIST_HEAD(&command->list);
431 list_add_tail(&command->list, &scsi_id->sbp2_command_orb_completed);
432 }
433 spin_unlock_irqrestore(&scsi_id->sbp2_command_orb_lock, flags);
434 return 0;
435}
436
437/*
438 * This function is called to delete a pool of command orbs.
439 */
440static void sbp2util_remove_command_orb_pool(struct scsi_id_instance_data *scsi_id)
441{
442 struct hpsb_host *host = scsi_id->hi->host;
443 struct list_head *lh, *next;
444 struct sbp2_command_info *command;
445 unsigned long flags;
446
447 spin_lock_irqsave(&scsi_id->sbp2_command_orb_lock, flags);
448 if (!list_empty(&scsi_id->sbp2_command_orb_completed)) {
449 list_for_each_safe(lh, next, &scsi_id->sbp2_command_orb_completed) {
450 command = list_entry(lh, struct sbp2_command_info, list);
451
452 /* Release our generic DMA's */
453 pci_unmap_single(host->pdev, command->command_orb_dma,
454 sizeof(struct sbp2_command_orb),
455 PCI_DMA_BIDIRECTIONAL);
456 SBP2_DMA_FREE("single command orb DMA");
457 pci_unmap_single(host->pdev, command->sge_dma,
458 sizeof(command->scatter_gather_element),
459 PCI_DMA_BIDIRECTIONAL);
460 SBP2_DMA_FREE("scatter_gather_element");
461
462 kfree(command);
463 }
464 }
465 spin_unlock_irqrestore(&scsi_id->sbp2_command_orb_lock, flags);
466 return;
467}
468
469/*
470 * This function finds the sbp2_command for a given outstanding command
471 * orb.Only looks at the inuse list.
472 */
473static struct sbp2_command_info *sbp2util_find_command_for_orb(
474 struct scsi_id_instance_data *scsi_id, dma_addr_t orb)
475{
476 struct sbp2_command_info *command;
477 unsigned long flags;
478
479 spin_lock_irqsave(&scsi_id->sbp2_command_orb_lock, flags);
480 if (!list_empty(&scsi_id->sbp2_command_orb_inuse)) {
481 list_for_each_entry(command, &scsi_id->sbp2_command_orb_inuse, list) {
482 if (command->command_orb_dma == orb) {
483 spin_unlock_irqrestore(&scsi_id->sbp2_command_orb_lock, flags);
a237f35f 484 return command;
1da177e4
LT		 485 }
486 }
487 }
488 spin_unlock_irqrestore(&scsi_id->sbp2_command_orb_lock, flags);
489
490 SBP2_ORB_DEBUG("could not match command orb %x", (unsigned int)orb);
491
a237f35f 492 return NULL;
1da177e4
LT		 493}
494
495/*
496 * This function finds the sbp2_command for a given outstanding SCpnt.
497 * Only looks at the inuse list.
498 */
499static struct sbp2_command_info *sbp2util_find_command_for_SCpnt(struct scsi_id_instance_data *scsi_id, void *SCpnt)
500{
501 struct sbp2_command_info *command;
502 unsigned long flags;
503
504 spin_lock_irqsave(&scsi_id->sbp2_command_orb_lock, flags);
505 if (!list_empty(&scsi_id->sbp2_command_orb_inuse)) {
506 list_for_each_entry(command, &scsi_id->sbp2_command_orb_inuse, list) {
507 if (command->Current_SCpnt == SCpnt) {
508 spin_unlock_irqrestore(&scsi_id->sbp2_command_orb_lock, flags);
a237f35f 509 return command;
1da177e4
LT		 510 }
511 }
512 }
513 spin_unlock_irqrestore(&scsi_id->sbp2_command_orb_lock, flags);
a237f35f 514 return NULL;
1da177e4
LT		 515}
516
517/*
518 * This function allocates a command orb used to send a scsi command.
519 */
520static struct sbp2_command_info *sbp2util_allocate_command_orb(
521 struct scsi_id_instance_data *scsi_id,
522 struct scsi_cmnd *Current_SCpnt,
523 void (*Current_done)(struct scsi_cmnd *))
524{
525 struct list_head *lh;
526 struct sbp2_command_info *command = NULL;
527 unsigned long flags;
528
529 spin_lock_irqsave(&scsi_id->sbp2_command_orb_lock, flags);
530 if (!list_empty(&scsi_id->sbp2_command_orb_completed)) {
531 lh = scsi_id->sbp2_command_orb_completed.next;
532 list_del(lh);
533 command = list_entry(lh, struct sbp2_command_info, list);
534 command->Current_done = Current_done;
535 command->Current_SCpnt = Current_SCpnt;
536 list_add_tail(&command->list, &scsi_id->sbp2_command_orb_inuse);
537 } else {
538 SBP2_ERR("sbp2util_allocate_command_orb - No orbs available!");
539 }
540 spin_unlock_irqrestore(&scsi_id->sbp2_command_orb_lock, flags);
a237f35f 541 return command;
1da177e4
LT		 542}
543
544/* Free our DMA's */
545static void sbp2util_free_command_dma(struct sbp2_command_info *command)
546{
547 struct scsi_id_instance_data *scsi_id =
548 (struct scsi_id_instance_data *)command->Current_SCpnt->device->host->hostdata[0];
549 struct hpsb_host *host;
550
551 if (!scsi_id) {
552 printk(KERN_ERR "%s: scsi_id == NULL\n", __FUNCTION__);
553 return;
554 }
555
556 host = scsi_id->ud->ne->host;
557
558 if (command->cmd_dma) {
559 if (command->dma_type == CMD_DMA_SINGLE) {
560 pci_unmap_single(host->pdev, command->cmd_dma,
561 command->dma_size, command->dma_dir);
562 SBP2_DMA_FREE("single bulk");
563 } else if (command->dma_type == CMD_DMA_PAGE) {
564 pci_unmap_page(host->pdev, command->cmd_dma,
565 command->dma_size, command->dma_dir);
566 SBP2_DMA_FREE("single page");
567 } /* XXX: Check for CMD_DMA_NONE bug */
568 command->dma_type = CMD_DMA_NONE;
569 command->cmd_dma = 0;
570 }
571
572 if (command->sge_buffer) {
573 pci_unmap_sg(host->pdev, command->sge_buffer,
574 command->dma_size, command->dma_dir);
575 SBP2_DMA_FREE("scatter list");
576 command->sge_buffer = NULL;
577 }
578}
579
580/*
581 * This function moves a command to the completed orb list.
582 */
a237f35f
SR		 583static void sbp2util_mark_command_completed(struct scsi_id_instance_data *scsi_id,
584 struct sbp2_command_info *command)
1da177e4
LT		 585{
586 unsigned long flags;
587
588 spin_lock_irqsave(&scsi_id->sbp2_command_orb_lock, flags);
589 list_del(&command->list);
590 sbp2util_free_command_dma(command);
591 list_add_tail(&command->list, &scsi_id->sbp2_command_orb_completed);
592 spin_unlock_irqrestore(&scsi_id->sbp2_command_orb_lock, flags);
593}
594
abd559b1
JM		 595/*
596 * Is scsi_id valid? Is the 1394 node still present?
597 */
598static inline int sbp2util_node_is_available(struct scsi_id_instance_data *scsi_id)
599{
600 return scsi_id && scsi_id->ne && !scsi_id->ne->in_limbo;
601}
602
1da177e4
LT		 603/*********************************************
604 * IEEE-1394 core driver stack related section
605 *********************************************/
606static struct scsi_id_instance_data *sbp2_alloc_device(struct unit_directory *ud);
607
608static int sbp2_probe(struct device *dev)
609{
610 struct unit_directory *ud;
611 struct scsi_id_instance_data *scsi_id;
612
613 SBP2_DEBUG("sbp2_probe");
614
615 ud = container_of(dev, struct unit_directory, device);
616
617 /* Don't probe UD's that have the LUN flag. We'll probe the LUN(s)
618 * instead. */
619 if (ud->flags & UNIT_DIRECTORY_HAS_LUN_DIRECTORY)
620 return -ENODEV;
621
a237f35f 622 scsi_id = sbp2_alloc_device(ud);
1da177e4 623
a237f35f
SR		 624 if (!scsi_id)
625 return -ENOMEM;
1da177e4 626
a237f35f 627 sbp2_parse_unit_directory(scsi_id, ud);
1da177e4 628
a237f35f 629 return sbp2_start_device(scsi_id);
1da177e4
LT		 630}
631
632static int sbp2_remove(struct device *dev)
633{
634 struct unit_directory *ud;
635 struct scsi_id_instance_data *scsi_id;
abd559b1 636 struct scsi_device *sdev;
1da177e4
LT		 637
638 SBP2_DEBUG("sbp2_remove");
639
640 ud = container_of(dev, struct unit_directory, device);
641 scsi_id = ud->device.driver_data;
abd559b1
JM		 642 if (!scsi_id)
643 return 0;
644
bf637ec3
SR		 645 if (scsi_id->scsi_host) {
646 /* Get rid of enqueued commands if there is no chance to
647 * send them. */
648 if (!sbp2util_node_is_available(scsi_id))
649 sbp2scsi_complete_all_commands(scsi_id, DID_NO_CONNECT);
650 /* scsi_remove_device() will trigger shutdown functions of SCSI
651 * highlevel drivers which would deadlock if blocked. */
abd559b1 652 scsi_unblock_requests(scsi_id->scsi_host);
bf637ec3 653 }
abd559b1
JM		 654 sdev = scsi_id->sdev;
655 if (sdev) {
656 scsi_id->sdev = NULL;
657 scsi_remove_device(sdev);
658 }
1da177e4
LT		 659
660 sbp2_logout_device(scsi_id);
661 sbp2_remove_device(scsi_id);
662
663 return 0;
664}
665
666static int sbp2_update(struct unit_directory *ud)
667{
668 struct scsi_id_instance_data *scsi_id = ud->device.driver_data;
669
670 SBP2_DEBUG("sbp2_update");
671
672 if (sbp2_reconnect_device(scsi_id)) {
673
674 /*
675 * Ok, reconnect has failed. Perhaps we didn't
676 * reconnect fast enough. Try doing a regular login, but
677 * first do a logout just in case of any weirdness.
678 */
679 sbp2_logout_device(scsi_id);
680
681 if (sbp2_login_device(scsi_id)) {
682 /* Login failed too, just fail, and the backend
683 * will call our sbp2_remove for us */
684 SBP2_ERR("Failed to reconnect to sbp2 device!");
685 return -EBUSY;
686 }
687 }
688
689 /* Set max retries to something large on the device. */
690 sbp2_set_busy_timeout(scsi_id);
691
692 /* Do a SBP-2 fetch agent reset. */
693 sbp2_agent_reset(scsi_id, 1);
694
695 /* Get the max speed and packet size that we can use. */
696 sbp2_max_speed_and_size(scsi_id);
697
698 /* Complete any pending commands with busy (so they get
699 * retried) and remove them from our queue
700 */
701 sbp2scsi_complete_all_commands(scsi_id, DID_BUS_BUSY);
702
703 /* Make sure we unblock requests (since this is likely after a bus
704 * reset). */
705 scsi_unblock_requests(scsi_id->scsi_host);
706
707 return 0;
708}
709
710/* This functions is called by the sbp2_probe, for each new device. We now
711 * allocate one scsi host for each scsi_id (unit directory). */
712static struct scsi_id_instance_data *sbp2_alloc_device(struct unit_directory *ud)
713{
714 struct sbp2scsi_host_info *hi;
715 struct Scsi_Host *scsi_host = NULL;
716 struct scsi_id_instance_data *scsi_id = NULL;
717
718 SBP2_DEBUG("sbp2_alloc_device");
719
8551158a 720 scsi_id = kzalloc(sizeof(*scsi_id), GFP_KERNEL);
1da177e4
LT		 721 if (!scsi_id) {
722 SBP2_ERR("failed to create scsi_id");
723 goto failed_alloc;
724 }
1da177e4
LT		 725
726 scsi_id->ne = ud->ne;
727 scsi_id->ud = ud;
728 scsi_id->speed_code = IEEE1394_SPEED_100;
729 scsi_id->max_payload_size = sbp2_speedto_max_payload[IEEE1394_SPEED_100];
730 atomic_set(&scsi_id->sbp2_login_complete, 0);
731 INIT_LIST_HEAD(&scsi_id->sbp2_command_orb_inuse);
732 INIT_LIST_HEAD(&scsi_id->sbp2_command_orb_completed);
733 INIT_LIST_HEAD(&scsi_id->scsi_list);
734 spin_lock_init(&scsi_id->sbp2_command_orb_lock);
e309fc6d 735 scsi_id->sbp2_lun = 0;
1da177e4
LT		 736
737 ud->device.driver_data = scsi_id;
738
739 hi = hpsb_get_hostinfo(&sbp2_highlevel, ud->ne->host);
740 if (!hi) {
741 hi = hpsb_create_hostinfo(&sbp2_highlevel, ud->ne->host, sizeof(*hi));
742 if (!hi) {
743 SBP2_ERR("failed to allocate hostinfo");
744 goto failed_alloc;
745 }
746 SBP2_DEBUG("sbp2_alloc_device: allocated hostinfo");
747 hi->host = ud->ne->host;
748 INIT_LIST_HEAD(&hi->scsi_ids);
749
1da177e4
LT		 750#ifdef CONFIG_IEEE1394_SBP2_PHYS_DMA
751 /* Handle data movement if physical dma is not
55664051
SR		 752 * enabled or not supported on host controller */
753 if (!hpsb_register_addrspace(&sbp2_highlevel, ud->ne->host,
754 &sbp2_physdma_ops,
755 0x0ULL, 0xfffffffcULL)) {
756 SBP2_ERR("failed to register lower 4GB address range");
757 goto failed_alloc;
758 }
1da177e4
LT		 759#endif
760 }
761
147830f2
SR		 762 /* Prevent unloading of the 1394 host */
763 if (!try_module_get(hi->host->driver->owner)) {
764 SBP2_ERR("failed to get a reference on 1394 host driver");
765 goto failed_alloc;
766 }
767
1da177e4
LT		 768 scsi_id->hi = hi;
769
770 list_add_tail(&scsi_id->scsi_list, &hi->scsi_ids);
771
35bdddb8
SR		 772 /* Register the status FIFO address range. We could use the same FIFO
773 * for targets at different nodes. However we need different FIFOs per
774 * target in order to support multi-unit devices. */
775 scsi_id->status_fifo_addr = hpsb_allocate_and_register_addrspace(
776 &sbp2_highlevel, ud->ne->host, &sbp2_ops,
777 sizeof(struct sbp2_status_block), sizeof(quadlet_t),
778 ~0ULL, ~0ULL);
779 if (!scsi_id->status_fifo_addr) {
780 SBP2_ERR("failed to allocate status FIFO address range");
781 goto failed_alloc;
782 }
783
1da177e4 784 /* Register our host with the SCSI stack. */
a2ef79e1 785 scsi_host = scsi_host_alloc(&scsi_driver_template,
a237f35f 786 sizeof(unsigned long));
1da177e4
LT		 787 if (!scsi_host) {
788 SBP2_ERR("failed to register scsi host");
789 goto failed_alloc;
790 }
791
792 scsi_host->hostdata[0] = (unsigned long)scsi_id;
793
794 if (!scsi_add_host(scsi_host, &ud->device)) {
795 scsi_id->scsi_host = scsi_host;
796 return scsi_id;
797 }
798
799 SBP2_ERR("failed to add scsi host");
800 scsi_host_put(scsi_host);
801
802failed_alloc:
803 sbp2_remove_device(scsi_id);
804 return NULL;
805}
806
1da177e4
LT		 807static void sbp2_host_reset(struct hpsb_host *host)
808{
809 struct sbp2scsi_host_info *hi;
810 struct scsi_id_instance_data *scsi_id;
811
812 hi = hpsb_get_hostinfo(&sbp2_highlevel, host);
813
814 if (hi) {
815 list_for_each_entry(scsi_id, &hi->scsi_ids, scsi_list)
816 scsi_block_requests(scsi_id->scsi_host);
817 }
818}
819
1da177e4
LT		 820/*
821 * This function is where we first pull the node unique ids, and then
822 * allocate memory and register a SBP-2 device.
823 */
824static int sbp2_start_device(struct scsi_id_instance_data *scsi_id)
825{
826 struct sbp2scsi_host_info *hi = scsi_id->hi;
146f7262 827 int error;
1da177e4
LT		 828
829 SBP2_DEBUG("sbp2_start_device");
830
831 /* Login FIFO DMA */
832 scsi_id->login_response =
a237f35f
SR		 833 pci_alloc_consistent(hi->host->pdev,
834 sizeof(struct sbp2_login_response),
1da177e4
LT		 835 &scsi_id->login_response_dma);
836 if (!scsi_id->login_response)
837 goto alloc_fail;
838 SBP2_DMA_ALLOC("consistent DMA region for login FIFO");
839
840 /* Query logins ORB DMA */
841 scsi_id->query_logins_orb =
a237f35f
SR		 842 pci_alloc_consistent(hi->host->pdev,
843 sizeof(struct sbp2_query_logins_orb),
1da177e4
LT		 844 &scsi_id->query_logins_orb_dma);
845 if (!scsi_id->query_logins_orb)
846 goto alloc_fail;
847 SBP2_DMA_ALLOC("consistent DMA region for query logins ORB");
848
849 /* Query logins response DMA */
850 scsi_id->query_logins_response =
a237f35f
SR		 851 pci_alloc_consistent(hi->host->pdev,
852 sizeof(struct sbp2_query_logins_response),
1da177e4
LT		 853 &scsi_id->query_logins_response_dma);
854 if (!scsi_id->query_logins_response)
855 goto alloc_fail;
856 SBP2_DMA_ALLOC("consistent DMA region for query logins response");
857
858 /* Reconnect ORB DMA */
859 scsi_id->reconnect_orb =
a237f35f
SR		 860 pci_alloc_consistent(hi->host->pdev,
861 sizeof(struct sbp2_reconnect_orb),
1da177e4
LT		 862 &scsi_id->reconnect_orb_dma);
863 if (!scsi_id->reconnect_orb)
864 goto alloc_fail;
865 SBP2_DMA_ALLOC("consistent DMA region for reconnect ORB");
866
867 /* Logout ORB DMA */
868 scsi_id->logout_orb =
a237f35f
SR		 869 pci_alloc_consistent(hi->host->pdev,
870 sizeof(struct sbp2_logout_orb),
1da177e4
LT		 871 &scsi_id->logout_orb_dma);
872 if (!scsi_id->logout_orb)
873 goto alloc_fail;
874 SBP2_DMA_ALLOC("consistent DMA region for logout ORB");
875
876 /* Login ORB DMA */
877 scsi_id->login_orb =
a237f35f
SR		 878 pci_alloc_consistent(hi->host->pdev,
879 sizeof(struct sbp2_login_orb),
1da177e4 880 &scsi_id->login_orb_dma);
eaceec7f
SR		 881 if (!scsi_id->login_orb)
882 goto alloc_fail;
1da177e4
LT		 883 SBP2_DMA_ALLOC("consistent DMA region for login ORB");
884
885 SBP2_DEBUG("New SBP-2 device inserted, SCSI ID = %x", scsi_id->ud->id);
886
887 /*
888 * Create our command orb pool
889 */
890 if (sbp2util_create_command_orb_pool(scsi_id)) {
891 SBP2_ERR("sbp2util_create_command_orb_pool failed!");
892 sbp2_remove_device(scsi_id);
893 return -ENOMEM;
894 }
895
896 /* Schedule a timeout here. The reason is that we may be so close
897 * to a bus reset, that the device is not available for logins.
898 * This can happen when the bus reset is caused by the host
899 * connected to the sbp2 device being removed. That host would
900 * have a certain amount of time to relogin before the sbp2 device
901 * allows someone else to login instead. One second makes sense. */
902 msleep_interruptible(1000);
903 if (signal_pending(current)) {
904 SBP2_WARN("aborting sbp2_start_device due to event");
905 sbp2_remove_device(scsi_id);
906 return -EINTR;
907 }
a237f35f 908
1da177e4
LT		 909 /*
910 * Login to the sbp-2 device
911 */
912 if (sbp2_login_device(scsi_id)) {
913 /* Login failed, just remove the device. */
914 sbp2_remove_device(scsi_id);
915 return -EBUSY;
916 }
917
918 /*
919 * Set max retries to something large on the device
920 */
921 sbp2_set_busy_timeout(scsi_id);
922
923 /*
924 * Do a SBP-2 fetch agent reset
925 */
926 sbp2_agent_reset(scsi_id, 1);
927
928 /*
929 * Get the max speed and packet size that we can use
930 */
931 sbp2_max_speed_and_size(scsi_id);
932
933 /* Add this device to the scsi layer now */
146f7262
JB		 934 error = scsi_add_device(scsi_id->scsi_host, 0, scsi_id->ud->id, 0);
935 if (error) {
1da177e4 936 SBP2_ERR("scsi_add_device failed");
dc3edd54
SR		 937 sbp2_logout_device(scsi_id);
938 sbp2_remove_device(scsi_id);
146f7262 939 return error;
1da177e4
LT		 940 }
941
942 return 0;
eaceec7f
SR		 943
944alloc_fail:
945 SBP2_ERR("Could not allocate memory for scsi_id");
946 sbp2_remove_device(scsi_id);
947 return -ENOMEM;
1da177e4
LT		 948}
949
950/*
951 * This function removes an sbp2 device from the sbp2scsi_host_info struct.
952 */
953static void sbp2_remove_device(struct scsi_id_instance_data *scsi_id)
954{
955 struct sbp2scsi_host_info *hi;
956
957 SBP2_DEBUG("sbp2_remove_device");
958
959 if (!scsi_id)
960 return;
961
962 hi = scsi_id->hi;
963
964 /* This will remove our scsi device aswell */
965 if (scsi_id->scsi_host) {
966 scsi_remove_host(scsi_id->scsi_host);
967 scsi_host_put(scsi_id->scsi_host);
968 }
969
970 sbp2util_remove_command_orb_pool(scsi_id);
971
972 list_del(&scsi_id->scsi_list);
973
974 if (scsi_id->login_response) {
975 pci_free_consistent(hi->host->pdev,
976 sizeof(struct sbp2_login_response),
977 scsi_id->login_response,
978 scsi_id->login_response_dma);
979 SBP2_DMA_FREE("single login FIFO");
980 }
981
982 if (scsi_id->login_orb) {
983 pci_free_consistent(hi->host->pdev,
984 sizeof(struct sbp2_login_orb),
985 scsi_id->login_orb,
986 scsi_id->login_orb_dma);
987 SBP2_DMA_FREE("single login ORB");
988 }
989
990 if (scsi_id->reconnect_orb) {
991 pci_free_consistent(hi->host->pdev,
992 sizeof(struct sbp2_reconnect_orb),
993 scsi_id->reconnect_orb,
994 scsi_id->reconnect_orb_dma);
995 SBP2_DMA_FREE("single reconnect orb");
996 }
997
998 if (scsi_id->logout_orb) {
999 pci_free_consistent(hi->host->pdev,
1000 sizeof(struct sbp2_logout_orb),
1001 scsi_id->logout_orb,
1002 scsi_id->logout_orb_dma);
1003 SBP2_DMA_FREE("single logout orb");
1004 }
1005
1006 if (scsi_id->query_logins_orb) {
1007 pci_free_consistent(hi->host->pdev,
1008 sizeof(struct sbp2_query_logins_orb),
1009 scsi_id->query_logins_orb,
1010 scsi_id->query_logins_orb_dma);
1011 SBP2_DMA_FREE("single query logins orb");
1012 }
1013
1014 if (scsi_id->query_logins_response) {
1015 pci_free_consistent(hi->host->pdev,
1016 sizeof(struct sbp2_query_logins_response),
1017 scsi_id->query_logins_response,
1018 scsi_id->query_logins_response_dma);
1019 SBP2_DMA_FREE("single query logins data");
1020 }
1021
35bdddb8
SR		 1022 if (scsi_id->status_fifo_addr)
1023 hpsb_unregister_addrspace(&sbp2_highlevel, hi->host,
1024 scsi_id->status_fifo_addr);
1025
1da177e4
LT		 1026 scsi_id->ud->device.driver_data = NULL;
1027
147830f2
SR		 1028 if (hi)
1029 module_put(hi->host->driver->owner);
1030
1da177e4
LT		 1031 SBP2_DEBUG("SBP-2 device removed, SCSI ID = %d", scsi_id->ud->id);
1032
1033 kfree(scsi_id);
1034}
1035
1036#ifdef CONFIG_IEEE1394_SBP2_PHYS_DMA
1037/*
1038 * This function deals with physical dma write requests (for adapters that do not support
1039 * physical dma in hardware). Mostly just here for debugging...
1040 */
a237f35f
SR		 1041static int sbp2_handle_physdma_write(struct hpsb_host *host, int nodeid,
1042 int destid, quadlet_t *data, u64 addr,
1043 size_t length, u16 flags)
1da177e4
LT		 1044{
1045
a237f35f
SR		 1046 /*
1047 * Manually put the data in the right place.
1048 */
1049 memcpy(bus_to_virt((u32) addr), data, length);
1050 sbp2util_packet_dump(data, length, "sbp2 phys dma write by device",
1051 (u32) addr);
1052 return RCODE_COMPLETE;
1da177e4
LT		 1053}
1054
1055/*
1056 * This function deals with physical dma read requests (for adapters that do not support
1057 * physical dma in hardware). Mostly just here for debugging...
1058 */
a237f35f
SR		 1059static int sbp2_handle_physdma_read(struct hpsb_host *host, int nodeid,
1060 quadlet_t *data, u64 addr, size_t length,
1061 u16 flags)
1da177e4
LT		 1062{
1063
a237f35f
SR		 1064 /*
1065 * Grab data from memory and send a read response.
1066 */
1067 memcpy(data, bus_to_virt((u32) addr), length);
1068 sbp2util_packet_dump(data, length, "sbp2 phys dma read by device",
1069 (u32) addr);
1070 return RCODE_COMPLETE;
1da177e4
LT		 1071}
1072#endif
1073
1da177e4
LT		 1074/**************************************
1075 * SBP-2 protocol related section
1076 **************************************/
1077
1da177e4
LT		 1078/*
1079 * This function queries the device for the maximum concurrent logins it
1080 * supports.
1081 */
1082static int sbp2_query_logins(struct scsi_id_instance_data *scsi_id)
1083{
1084 struct sbp2scsi_host_info *hi = scsi_id->hi;
1085 quadlet_t data[2];
1086 int max_logins;
1087 int active_logins;
1088
1089 SBP2_DEBUG("sbp2_query_logins");
1090
1091 scsi_id->query_logins_orb->reserved1 = 0x0;
1092 scsi_id->query_logins_orb->reserved2 = 0x0;
1093
1094 scsi_id->query_logins_orb->query_response_lo = scsi_id->query_logins_response_dma;
1095 scsi_id->query_logins_orb->query_response_hi = ORB_SET_NODE_ID(hi->host->node_id);
1096 SBP2_DEBUG("sbp2_query_logins: query_response_hi/lo initialized");
1097
1098 scsi_id->query_logins_orb->lun_misc = ORB_SET_FUNCTION(SBP2_QUERY_LOGINS_REQUEST);
1099 scsi_id->query_logins_orb->lun_misc |= ORB_SET_NOTIFY(1);
e309fc6d 1100 scsi_id->query_logins_orb->lun_misc |= ORB_SET_LUN(scsi_id->sbp2_lun);
1da177e4
LT		 1101 SBP2_DEBUG("sbp2_query_logins: lun_misc initialized");
1102
1103 scsi_id->query_logins_orb->reserved_resp_length =
1104 ORB_SET_QUERY_LOGINS_RESP_LENGTH(sizeof(struct sbp2_query_logins_response));
1105 SBP2_DEBUG("sbp2_query_logins: reserved_resp_length initialized");
1106
35bdddb8
SR		 1107 scsi_id->query_logins_orb->status_fifo_hi =
1108 ORB_SET_STATUS_FIFO_HI(scsi_id->status_fifo_addr, hi->host->node_id);
1109 scsi_id->query_logins_orb->status_fifo_lo =
1110 ORB_SET_STATUS_FIFO_LO(scsi_id->status_fifo_addr);
1da177e4
LT		 1111
1112 sbp2util_cpu_to_be32_buffer(scsi_id->query_logins_orb, sizeof(struct sbp2_query_logins_orb));
1113
1114 SBP2_DEBUG("sbp2_query_logins: orb byte-swapped");
1115
1116 sbp2util_packet_dump(scsi_id->query_logins_orb, sizeof(struct sbp2_query_logins_orb),
1117 "sbp2 query logins orb", scsi_id->query_logins_orb_dma);
1118
1119 memset(scsi_id->query_logins_response, 0, sizeof(struct sbp2_query_logins_response));
1120 memset(&scsi_id->status_block, 0, sizeof(struct sbp2_status_block));
1121
1122 SBP2_DEBUG("sbp2_query_logins: query_logins_response/status FIFO memset");
1123
1124 data[0] = ORB_SET_NODE_ID(hi->host->node_id);
1125 data[1] = scsi_id->query_logins_orb_dma;
1126 sbp2util_cpu_to_be32_buffer(data, 8);
1127
1128 atomic_set(&scsi_id->sbp2_login_complete, 0);
1129
1130 SBP2_DEBUG("sbp2_query_logins: prepared to write");
1131 hpsb_node_write(scsi_id->ne, scsi_id->sbp2_management_agent_addr, data, 8);
1132 SBP2_DEBUG("sbp2_query_logins: written");
1133
1134 if (sbp2util_down_timeout(&scsi_id->sbp2_login_complete, 2*HZ)) {
1135 SBP2_INFO("Error querying logins to SBP-2 device - timed out");
a237f35f 1136 return -EIO;
1da177e4
LT		 1137 }
1138
1139 if (scsi_id->status_block.ORB_offset_lo != scsi_id->query_logins_orb_dma) {
1140 SBP2_INFO("Error querying logins to SBP-2 device - timed out");
a237f35f 1141 return -EIO;
1da177e4
LT		 1142 }
1143
1144 if (STATUS_GET_RESP(scsi_id->status_block.ORB_offset_hi_misc) ||
1145 STATUS_GET_DEAD_BIT(scsi_id->status_block.ORB_offset_hi_misc) ||
1146 STATUS_GET_SBP_STATUS(scsi_id->status_block.ORB_offset_hi_misc)) {
1147
1148 SBP2_INFO("Error querying logins to SBP-2 device - timed out");
a237f35f 1149 return -EIO;
1da177e4
LT		 1150 }
1151
1152 sbp2util_cpu_to_be32_buffer(scsi_id->query_logins_response, sizeof(struct sbp2_query_logins_response));
1153
1154 SBP2_DEBUG("length_max_logins = %x",
1155 (unsigned int)scsi_id->query_logins_response->length_max_logins);
1156
1157 SBP2_DEBUG("Query logins to SBP-2 device successful");
1158
1159 max_logins = RESPONSE_GET_MAX_LOGINS(scsi_id->query_logins_response->length_max_logins);
1160 SBP2_DEBUG("Maximum concurrent logins supported: %d", max_logins);
1161
1162 active_logins = RESPONSE_GET_ACTIVE_LOGINS(scsi_id->query_logins_response->length_max_logins);
1163 SBP2_DEBUG("Number of active logins: %d", active_logins);
1164
1165 if (active_logins >= max_logins) {
a237f35f 1166 return -EIO;
1da177e4
LT		 1167 }
1168
1169 return 0;
1170}
1171
1172/*
1173 * This function is called in order to login to a particular SBP-2 device,
1174 * after a bus reset.
1175 */
1176static int sbp2_login_device(struct scsi_id_instance_data *scsi_id)
1177{
1178 struct sbp2scsi_host_info *hi = scsi_id->hi;
1179 quadlet_t data[2];
1180
1181 SBP2_DEBUG("sbp2_login_device");
1182
1183 if (!scsi_id->login_orb) {
1184 SBP2_DEBUG("sbp2_login_device: login_orb not alloc'd!");
a237f35f 1185 return -EIO;
1da177e4
LT		 1186 }
1187
1188 if (!exclusive_login) {
1189 if (sbp2_query_logins(scsi_id)) {
1190 SBP2_INFO("Device does not support any more concurrent logins");
a237f35f 1191 return -EIO;
1da177e4
LT		 1192 }
1193 }
1194
1195 /* Set-up login ORB, assume no password */
1196 scsi_id->login_orb->password_hi = 0;
1197 scsi_id->login_orb->password_lo = 0;
1198 SBP2_DEBUG("sbp2_login_device: password_hi/lo initialized");
1199
1200 scsi_id->login_orb->login_response_lo = scsi_id->login_response_dma;
1201 scsi_id->login_orb->login_response_hi = ORB_SET_NODE_ID(hi->host->node_id);
1202 SBP2_DEBUG("sbp2_login_device: login_response_hi/lo initialized");
1203
1204 scsi_id->login_orb->lun_misc = ORB_SET_FUNCTION(SBP2_LOGIN_REQUEST);
1205 scsi_id->login_orb->lun_misc |= ORB_SET_RECONNECT(0); /* One second reconnect time */
1206 scsi_id->login_orb->lun_misc |= ORB_SET_EXCLUSIVE(exclusive_login); /* Exclusive access to device */
1207 scsi_id->login_orb->lun_misc |= ORB_SET_NOTIFY(1); /* Notify us of login complete */
e309fc6d 1208 scsi_id->login_orb->lun_misc |= ORB_SET_LUN(scsi_id->sbp2_lun);
1da177e4
LT		 1209 SBP2_DEBUG("sbp2_login_device: lun_misc initialized");
1210
1211 scsi_id->login_orb->passwd_resp_lengths =
1212 ORB_SET_LOGIN_RESP_LENGTH(sizeof(struct sbp2_login_response));
1213 SBP2_DEBUG("sbp2_login_device: passwd_resp_lengths initialized");
1214
35bdddb8
SR		 1215 scsi_id->login_orb->status_fifo_hi =
1216 ORB_SET_STATUS_FIFO_HI(scsi_id->status_fifo_addr, hi->host->node_id);
1217 scsi_id->login_orb->status_fifo_lo =
1218 ORB_SET_STATUS_FIFO_LO(scsi_id->status_fifo_addr);
1da177e4
LT		 1219
1220 /*
1221 * Byte swap ORB if necessary
1222 */
1223 sbp2util_cpu_to_be32_buffer(scsi_id->login_orb, sizeof(struct sbp2_login_orb));
1224
1225 SBP2_DEBUG("sbp2_login_device: orb byte-swapped");
1226
1227 sbp2util_packet_dump(scsi_id->login_orb, sizeof(struct sbp2_login_orb),
1228 "sbp2 login orb", scsi_id->login_orb_dma);
1229
1230 /*
1231 * Initialize login response and status fifo
1232 */
1233 memset(scsi_id->login_response, 0, sizeof(struct sbp2_login_response));
1234 memset(&scsi_id->status_block, 0, sizeof(struct sbp2_status_block));
1235
1236 SBP2_DEBUG("sbp2_login_device: login_response/status FIFO memset");
1237
1238 /*
1239 * Ok, let's write to the target's management agent register
1240 */
1241 data[0] = ORB_SET_NODE_ID(hi->host->node_id);
1242 data[1] = scsi_id->login_orb_dma;
1243 sbp2util_cpu_to_be32_buffer(data, 8);
1244
1245 atomic_set(&scsi_id->sbp2_login_complete, 0);
1246
1247 SBP2_DEBUG("sbp2_login_device: prepared to write to %08x",
1248 (unsigned int)scsi_id->sbp2_management_agent_addr);
1249 hpsb_node_write(scsi_id->ne, scsi_id->sbp2_management_agent_addr, data, 8);
1250 SBP2_DEBUG("sbp2_login_device: written");
1251
1252 /*
1253 * Wait for login status (up to 20 seconds)...
1254 */
1255 if (sbp2util_down_timeout(&scsi_id->sbp2_login_complete, 20*HZ)) {
1256 SBP2_ERR("Error logging into SBP-2 device - login timed-out");
a237f35f 1257 return -EIO;
1da177e4
LT		 1258 }
1259
1260 /*
1261 * Sanity. Make sure status returned matches login orb.
1262 */
1263 if (scsi_id->status_block.ORB_offset_lo != scsi_id->login_orb_dma) {
1264 SBP2_ERR("Error logging into SBP-2 device - login timed-out");
a237f35f 1265 return -EIO;
1da177e4
LT		 1266 }
1267
1268 /*
1269 * Check status
1270 */
1271 if (STATUS_GET_RESP(scsi_id->status_block.ORB_offset_hi_misc) ||
1272 STATUS_GET_DEAD_BIT(scsi_id->status_block.ORB_offset_hi_misc) ||
1273 STATUS_GET_SBP_STATUS(scsi_id->status_block.ORB_offset_hi_misc)) {
1274
1275 SBP2_ERR("Error logging into SBP-2 device - login failed");
a237f35f 1276 return -EIO;
1da177e4
LT		 1277 }
1278
1279 /*
1280 * Byte swap the login response, for use when reconnecting or
1281 * logging out.
1282 */
1283 sbp2util_cpu_to_be32_buffer(scsi_id->login_response, sizeof(struct sbp2_login_response));
1284
1285 /*
1286 * Grab our command block agent address from the login response.
1287 */
1288 SBP2_DEBUG("command_block_agent_hi = %x",
1289 (unsigned int)scsi_id->login_response->command_block_agent_hi);
1290 SBP2_DEBUG("command_block_agent_lo = %x",
1291 (unsigned int)scsi_id->login_response->command_block_agent_lo);
1292
1293 scsi_id->sbp2_command_block_agent_addr =
1294 ((u64)scsi_id->login_response->command_block_agent_hi) << 32;
1295 scsi_id->sbp2_command_block_agent_addr |= ((u64)scsi_id->login_response->command_block_agent_lo);
1296 scsi_id->sbp2_command_block_agent_addr &= 0x0000ffffffffffffULL;
1297
1298 SBP2_INFO("Logged into SBP-2 device");
1299
a237f35f 1300 return 0;
1da177e4
LT		 1301
1302}
1303
1304/*
1305 * This function is called in order to logout from a particular SBP-2
1306 * device, usually called during driver unload.
1307 */
1308static int sbp2_logout_device(struct scsi_id_instance_data *scsi_id)
1309{
1310 struct sbp2scsi_host_info *hi = scsi_id->hi;
1311 quadlet_t data[2];
1312 int error;
1313
1314 SBP2_DEBUG("sbp2_logout_device");
1315
1316 /*
1317 * Set-up logout ORB
1318 */
1319 scsi_id->logout_orb->reserved1 = 0x0;
1320 scsi_id->logout_orb->reserved2 = 0x0;
1321 scsi_id->logout_orb->reserved3 = 0x0;
1322 scsi_id->logout_orb->reserved4 = 0x0;
1323
1324 scsi_id->logout_orb->login_ID_misc = ORB_SET_FUNCTION(SBP2_LOGOUT_REQUEST);
1325 scsi_id->logout_orb->login_ID_misc |= ORB_SET_LOGIN_ID(scsi_id->login_response->length_login_ID);
1326
1327 /* Notify us when complete */
1328 scsi_id->logout_orb->login_ID_misc |= ORB_SET_NOTIFY(1);
1329
1330 scsi_id->logout_orb->reserved5 = 0x0;
35bdddb8
SR		 1331 scsi_id->logout_orb->status_fifo_hi =
1332 ORB_SET_STATUS_FIFO_HI(scsi_id->status_fifo_addr, hi->host->node_id);
1333 scsi_id->logout_orb->status_fifo_lo =
1334 ORB_SET_STATUS_FIFO_LO(scsi_id->status_fifo_addr);
1da177e4
LT		 1335
1336 /*
1337 * Byte swap ORB if necessary
1338 */
1339 sbp2util_cpu_to_be32_buffer(scsi_id->logout_orb, sizeof(struct sbp2_logout_orb));
1340
1341 sbp2util_packet_dump(scsi_id->logout_orb, sizeof(struct sbp2_logout_orb),
1342 "sbp2 logout orb", scsi_id->logout_orb_dma);
1343
1344 /*
1345 * Ok, let's write to the target's management agent register
1346 */
1347 data[0] = ORB_SET_NODE_ID(hi->host->node_id);
1348 data[1] = scsi_id->logout_orb_dma;
1349 sbp2util_cpu_to_be32_buffer(data, 8);
1350
1351 atomic_set(&scsi_id->sbp2_login_complete, 0);
1352
1353 error = hpsb_node_write(scsi_id->ne,
a237f35f 1354 scsi_id->sbp2_management_agent_addr, data, 8);
1da177e4
LT		 1355 if (error)
1356 return error;
1357
1358 /* Wait for device to logout...1 second. */
1359 if (sbp2util_down_timeout(&scsi_id->sbp2_login_complete, HZ))
1360 return -EIO;
1361
1362 SBP2_INFO("Logged out of SBP-2 device");
1363
a237f35f 1364 return 0;
1da177e4
LT		 1365
1366}
1367
1368/*
1369 * This function is called in order to reconnect to a particular SBP-2
1370 * device, after a bus reset.
1371 */
1372static int sbp2_reconnect_device(struct scsi_id_instance_data *scsi_id)
1373{
1374 struct sbp2scsi_host_info *hi = scsi_id->hi;
1375 quadlet_t data[2];
1376 int error;
1377
1378 SBP2_DEBUG("sbp2_reconnect_device");
1379
1380 /*
1381 * Set-up reconnect ORB
1382 */
1383 scsi_id->reconnect_orb->reserved1 = 0x0;
1384 scsi_id->reconnect_orb->reserved2 = 0x0;
1385 scsi_id->reconnect_orb->reserved3 = 0x0;
1386 scsi_id->reconnect_orb->reserved4 = 0x0;
1387
1388 scsi_id->reconnect_orb->login_ID_misc = ORB_SET_FUNCTION(SBP2_RECONNECT_REQUEST);
1389 scsi_id->reconnect_orb->login_ID_misc |=
1390 ORB_SET_LOGIN_ID(scsi_id->login_response->length_login_ID);
1391
1392 /* Notify us when complete */
1393 scsi_id->reconnect_orb->login_ID_misc |= ORB_SET_NOTIFY(1);
1394
1395 scsi_id->reconnect_orb->reserved5 = 0x0;
35bdddb8
SR		 1396 scsi_id->reconnect_orb->status_fifo_hi =
1397 ORB_SET_STATUS_FIFO_HI(scsi_id->status_fifo_addr, hi->host->node_id);
1398 scsi_id->reconnect_orb->status_fifo_lo =
1399 ORB_SET_STATUS_FIFO_LO(scsi_id->status_fifo_addr);
1da177e4
LT		 1400
1401 /*
1402 * Byte swap ORB if necessary
1403 */
1404 sbp2util_cpu_to_be32_buffer(scsi_id->reconnect_orb, sizeof(struct sbp2_reconnect_orb));
1405
1406 sbp2util_packet_dump(scsi_id->reconnect_orb, sizeof(struct sbp2_reconnect_orb),
1407 "sbp2 reconnect orb", scsi_id->reconnect_orb_dma);
1408
1409 /*
1410 * Initialize status fifo
1411 */
1412 memset(&scsi_id->status_block, 0, sizeof(struct sbp2_status_block));
1413
1414 /*
1415 * Ok, let's write to the target's management agent register
1416 */
1417 data[0] = ORB_SET_NODE_ID(hi->host->node_id);
1418 data[1] = scsi_id->reconnect_orb_dma;
1419 sbp2util_cpu_to_be32_buffer(data, 8);
1420
1421 atomic_set(&scsi_id->sbp2_login_complete, 0);
1422
1423 error = hpsb_node_write(scsi_id->ne,
a237f35f 1424 scsi_id->sbp2_management_agent_addr, data, 8);
1da177e4
LT		 1425 if (error)
1426 return error;
1427
1428 /*
1429 * Wait for reconnect status (up to 1 second)...
1430 */
1431 if (sbp2util_down_timeout(&scsi_id->sbp2_login_complete, HZ)) {
1432 SBP2_ERR("Error reconnecting to SBP-2 device - reconnect timed-out");
a237f35f 1433 return -EIO;
1da177e4
LT		 1434 }
1435
1436 /*
1437 * Sanity. Make sure status returned matches reconnect orb.
1438 */
1439 if (scsi_id->status_block.ORB_offset_lo != scsi_id->reconnect_orb_dma) {
1440 SBP2_ERR("Error reconnecting to SBP-2 device - reconnect timed-out");
a237f35f 1441 return -EIO;
1da177e4
LT		 1442 }
1443
1444 /*
1445 * Check status
1446 */
1447 if (STATUS_GET_RESP(scsi_id->status_block.ORB_offset_hi_misc) ||
1448 STATUS_GET_DEAD_BIT(scsi_id->status_block.ORB_offset_hi_misc) ||
1449 STATUS_GET_SBP_STATUS(scsi_id->status_block.ORB_offset_hi_misc)) {
1450
1451 SBP2_ERR("Error reconnecting to SBP-2 device - reconnect failed");
a237f35f 1452 return -EIO;
1da177e4
LT		 1453 }
1454
1455 HPSB_DEBUG("Reconnected to SBP-2 device");
1456
a237f35f 1457 return 0;
1da177e4
LT		 1458
1459}
1460
1461/*
1462 * This function is called in order to set the busy timeout (number of
1463 * retries to attempt) on the sbp2 device.
1464 */
1465static int sbp2_set_busy_timeout(struct scsi_id_instance_data *scsi_id)
1466{
1467 quadlet_t data;
1468
1469 SBP2_DEBUG("sbp2_set_busy_timeout");
1470
1471 /*
1472 * Ok, let's write to the target's busy timeout register
1473 */
1474 data = cpu_to_be32(SBP2_BUSY_TIMEOUT_VALUE);
1475
1476 if (hpsb_node_write(scsi_id->ne, SBP2_BUSY_TIMEOUT_ADDRESS, &data, 4)) {
1477 SBP2_ERR("sbp2_set_busy_timeout error");
1478 }
1479
a237f35f 1480 return 0;
1da177e4
LT		 1481}
1482
1da177e4
LT		 1483/*
1484 * This function is called to parse sbp2 device's config rom unit
1485 * directory. Used to determine things like sbp2 management agent offset,
1486 * and command set used (SCSI or RBC).
1487 */
1488static void sbp2_parse_unit_directory(struct scsi_id_instance_data *scsi_id,
1489 struct unit_directory *ud)
1490{
1491 struct csr1212_keyval *kv;
1492 struct csr1212_dentry *dentry;
1493 u64 management_agent_addr;
1494 u32 command_set_spec_id, command_set, unit_characteristics,
a237f35f 1495 firmware_revision, workarounds;
1da177e4
LT		 1496 int i;
1497
1498 SBP2_DEBUG("sbp2_parse_unit_directory");
1499
1500 management_agent_addr = 0x0;
1501 command_set_spec_id = 0x0;
1502 command_set = 0x0;
1503 unit_characteristics = 0x0;
1504 firmware_revision = 0x0;
1505
1506 /* Handle different fields in the unit directory, based on keys */
1507 csr1212_for_each_dir_entry(ud->ne->csr, kv, ud->ud_kv, dentry) {
1508 switch (kv->key.id) {
1509 case CSR1212_KV_ID_DEPENDENT_INFO:
1510 if (kv->key.type == CSR1212_KV_TYPE_CSR_OFFSET) {
1511 /* Save off the management agent address */
1512 management_agent_addr =
a237f35f
SR		 1513 CSR1212_REGISTER_SPACE_BASE +
1514 (kv->value.csr_offset << 2);
1da177e4
LT		 1515
1516 SBP2_DEBUG("sbp2_management_agent_addr = %x",
a237f35f 1517 (unsigned int)management_agent_addr);
1da177e4 1518 } else if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
a237f35f
SR		 1519 scsi_id->sbp2_lun =
1520 ORB_SET_LUN(kv->value.immediate);
1da177e4
LT		 1521 }
1522 break;
1523
1524 case SBP2_COMMAND_SET_SPEC_ID_KEY:
1525 /* Command spec organization */
1526 command_set_spec_id = kv->value.immediate;
1527 SBP2_DEBUG("sbp2_command_set_spec_id = %x",
a237f35f 1528 (unsigned int)command_set_spec_id);
1da177e4
LT		 1529 break;
1530
1531 case SBP2_COMMAND_SET_KEY:
1532 /* Command set used by sbp2 device */
1533 command_set = kv->value.immediate;
1534 SBP2_DEBUG("sbp2_command_set = %x",
a237f35f 1535 (unsigned int)command_set);
1da177e4
LT		 1536 break;
1537
1538 case SBP2_UNIT_CHARACTERISTICS_KEY:
1539 /*
1540 * Unit characterisitcs (orb related stuff
1541 * that I'm not yet paying attention to)
1542 */
1543 unit_characteristics = kv->value.immediate;
1544 SBP2_DEBUG("sbp2_unit_characteristics = %x",
a237f35f 1545 (unsigned int)unit_characteristics);
1da177e4
LT		 1546 break;
1547
1548 case SBP2_FIRMWARE_REVISION_KEY:
1549 /* Firmware revision */
1550 firmware_revision = kv->value.immediate;
1551 if (force_inquiry_hack)
1552 SBP2_INFO("sbp2_firmware_revision = %x",
a237f35f
SR		 1553 (unsigned int)firmware_revision);
1554 else
1555 SBP2_DEBUG("sbp2_firmware_revision = %x",
1556 (unsigned int)firmware_revision);
1da177e4
LT		 1557 break;
1558
1559 default:
1560 break;
1561 }
1562 }
1563
1564 /* This is the start of our broken device checking. We try to hack
1565 * around oddities and known defects. */
1566 workarounds = 0x0;
1567
1568 /* If the vendor id is 0xa0b8 (Symbios vendor id), then we have a
1569 * bridge with 128KB max transfer size limitation. For sanity, we
1570 * only voice this when the current max_sectors setting
1571 * exceeds the 128k limit. By default, that is not the case.
1572 *
1573 * It would be really nice if we could detect this before the scsi
1574 * host gets initialized. That way we can down-force the
1575 * max_sectors to account for it. That is not currently
1576 * possible. */
1577 if ((firmware_revision & 0xffff00) ==
1578 SBP2_128KB_BROKEN_FIRMWARE &&
1579 (max_sectors * 512) > (128*1024)) {
1580 SBP2_WARN("Node " NODE_BUS_FMT ": Bridge only supports 128KB max transfer size.",
1581 NODE_BUS_ARGS(ud->ne->host, ud->ne->nodeid));
1582 SBP2_WARN("WARNING: Current max_sectors setting is larger than 128KB (%d sectors)!",
1583 max_sectors);
1584 workarounds |= SBP2_BREAKAGE_128K_MAX_TRANSFER;
1585 }
1586
1587 /* Check for a blacklisted set of devices that require us to force
1588 * a 36 byte host inquiry. This can be overriden as a module param
1589 * (to force all hosts). */
a80614d1 1590 for (i = 0; i < ARRAY_SIZE(sbp2_broken_inquiry_list); i++) {
1da177e4
LT		 1591 if ((firmware_revision & 0xffff00) ==
1592 sbp2_broken_inquiry_list[i]) {
1593 SBP2_WARN("Node " NODE_BUS_FMT ": Using 36byte inquiry workaround",
1594 NODE_BUS_ARGS(ud->ne->host, ud->ne->nodeid));
1595 workarounds |= SBP2_BREAKAGE_INQUIRY_HACK;
1596 break; /* No need to continue. */
1597 }
1598 }
1599
1600 /* If this is a logical unit directory entry, process the parent
1601 * to get the values. */
1602 if (ud->flags & UNIT_DIRECTORY_LUN_DIRECTORY) {
1603 struct unit_directory *parent_ud =
1604 container_of(ud->device.parent, struct unit_directory, device);
1605 sbp2_parse_unit_directory(scsi_id, parent_ud);
1606 } else {
1607 scsi_id->sbp2_management_agent_addr = management_agent_addr;
1608 scsi_id->sbp2_command_set_spec_id = command_set_spec_id;
1609 scsi_id->sbp2_command_set = command_set;
1610 scsi_id->sbp2_unit_characteristics = unit_characteristics;
1611 scsi_id->sbp2_firmware_revision = firmware_revision;
1612 scsi_id->workarounds = workarounds;
1613 if (ud->flags & UNIT_DIRECTORY_HAS_LUN)
e309fc6d 1614 scsi_id->sbp2_lun = ORB_SET_LUN(ud->lun);
1da177e4
LT		 1615 }
1616}
1617
1618/*
1619 * This function is called in order to determine the max speed and packet
1620 * size we can use in our ORBs. Note, that we (the driver and host) only
1621 * initiate the transaction. The SBP-2 device actually transfers the data
1622 * (by reading from the DMA area we tell it). This means that the SBP-2
1623 * device decides the actual maximum data it can transfer. We just tell it
1624 * the speed that it needs to use, and the max_rec the host supports, and
1625 * it takes care of the rest.
1626 */
1627static int sbp2_max_speed_and_size(struct scsi_id_instance_data *scsi_id)
1628{
1629 struct sbp2scsi_host_info *hi = scsi_id->hi;
1630
1631 SBP2_DEBUG("sbp2_max_speed_and_size");
1632
1633 /* Initial setting comes from the hosts speed map */
a237f35f
SR		 1634 scsi_id->speed_code =
1635 hi->host->speed_map[NODEID_TO_NODE(hi->host->node_id) * 64 +
1636 NODEID_TO_NODE(scsi_id->ne->nodeid)];
1da177e4
LT		 1637
1638 /* Bump down our speed if the user requested it */
1639 if (scsi_id->speed_code > max_speed) {
1640 scsi_id->speed_code = max_speed;
1641 SBP2_ERR("Forcing SBP-2 max speed down to %s",
1642 hpsb_speedto_str[scsi_id->speed_code]);
1643 }
1644
1645 /* Payload size is the lesser of what our speed supports and what
1646 * our host supports. */
a237f35f
SR		 1647 scsi_id->max_payload_size =
1648 min(sbp2_speedto_max_payload[scsi_id->speed_code],
1649 (u8) (hi->host->csr.max_rec - 1));
1da177e4
LT		 1650
1651 HPSB_DEBUG("Node " NODE_BUS_FMT ": Max speed [%s] - Max payload [%u]",
1652 NODE_BUS_ARGS(hi->host, scsi_id->ne->nodeid),
1653 hpsb_speedto_str[scsi_id->speed_code],
a237f35f 1654 1 << ((u32) scsi_id->max_payload_size + 2));
1da177e4 1655
a237f35f 1656 return 0;
1da177e4
LT		 1657}
1658
1659/*
1660 * This function is called in order to perform a SBP-2 agent reset.
1661 */
1662static int sbp2_agent_reset(struct scsi_id_instance_data *scsi_id, int wait)
1663{
1664 quadlet_t data;
1665 u64 addr;
1666 int retval;
1667
1668 SBP2_DEBUG("sbp2_agent_reset");
1669
1670 /*
1671 * Ok, let's write to the target's management agent register
1672 */
1673 data = ntohl(SBP2_AGENT_RESET_DATA);
1674 addr = scsi_id->sbp2_command_block_agent_addr + SBP2_AGENT_RESET_OFFSET;
1675
1676 if (wait)
1677 retval = hpsb_node_write(scsi_id->ne, addr, &data, 4);
1678 else
1679 retval = sbp2util_node_write_no_wait(scsi_id->ne, addr, &data, 4);
1680
1681 if (retval < 0) {
1682 SBP2_ERR("hpsb_node_write failed.\n");
1683 return -EIO;
1684 }
1685
1686 /*
1687 * Need to make sure orb pointer is written on next command
1688 */
1689 scsi_id->last_orb = NULL;
1690
a237f35f 1691 return 0;
1da177e4
LT		 1692}
1693
cf8d2c09
SR		 1694static void sbp2_prep_command_orb_sg(struct sbp2_command_orb *orb,
1695 struct sbp2scsi_host_info *hi,
1696 struct sbp2_command_info *command,
1697 unsigned int scsi_use_sg,
1698 struct scatterlist *sgpnt,
1699 u32 orb_direction,
1700 enum dma_data_direction dma_dir)
1701{
1702 command->dma_dir = dma_dir;
1703 orb->data_descriptor_hi = ORB_SET_NODE_ID(hi->host->node_id);
1704 orb->misc |= ORB_SET_DIRECTION(orb_direction);
1705
1706 /* Special case if only one element (and less than 64KB in size) */
1707 if ((scsi_use_sg == 1) &&
1708 (sgpnt[0].length <= SBP2_MAX_SG_ELEMENT_LENGTH)) {
1709
1710 SBP2_DEBUG("Only one s/g element");
1711 command->dma_size = sgpnt[0].length;
1712 command->dma_type = CMD_DMA_PAGE;
1713 command->cmd_dma = pci_map_page(hi->host->pdev,
1714 sgpnt[0].page,
1715 sgpnt[0].offset,
1716 command->dma_size,
1717 command->dma_dir);
1718 SBP2_DMA_ALLOC("single page scatter element");
1719
1720 orb->data_descriptor_lo = command->cmd_dma;
1721 orb->misc |= ORB_SET_DATA_SIZE(command->dma_size);
1722
1723 } else {
1724 struct sbp2_unrestricted_page_table *sg_element =
1725 &command->scatter_gather_element[0];
1726 u32 sg_count, sg_len;
1727 dma_addr_t sg_addr;
1728 int i, count = pci_map_sg(hi->host->pdev, sgpnt, scsi_use_sg,
1729 dma_dir);
1730
1731 SBP2_DMA_ALLOC("scatter list");
1732
1733 command->dma_size = scsi_use_sg;
1734 command->sge_buffer = sgpnt;
1735
1736 /* use page tables (s/g) */
1737 orb->misc |= ORB_SET_PAGE_TABLE_PRESENT(0x1);
1738 orb->data_descriptor_lo = command->sge_dma;
1739
1740 /*
1741 * Loop through and fill out our sbp-2 page tables
1742 * (and split up anything too large)
1743 */
1744 for (i = 0, sg_count = 0 ; i < count; i++, sgpnt++) {
1745 sg_len = sg_dma_len(sgpnt);
1746 sg_addr = sg_dma_address(sgpnt);
1747 while (sg_len) {
1748 sg_element[sg_count].segment_base_lo = sg_addr;
1749 if (sg_len > SBP2_MAX_SG_ELEMENT_LENGTH) {
1750 sg_element[sg_count].length_segment_base_hi =
1751 PAGE_TABLE_SET_SEGMENT_LENGTH(SBP2_MAX_SG_ELEMENT_LENGTH);
1752 sg_addr += SBP2_MAX_SG_ELEMENT_LENGTH;
1753 sg_len -= SBP2_MAX_SG_ELEMENT_LENGTH;
1754 } else {
1755 sg_element[sg_count].length_segment_base_hi =
1756 PAGE_TABLE_SET_SEGMENT_LENGTH(sg_len);
1757 sg_len = 0;
1758 }
1759 sg_count++;
1760 }
1761 }
1762
1763 /* Number of page table (s/g) elements */
1764 orb->misc |= ORB_SET_DATA_SIZE(sg_count);
1765
1766 sbp2util_packet_dump(sg_element,
1767 (sizeof(struct sbp2_unrestricted_page_table)) * sg_count,
1768 "sbp2 s/g list", command->sge_dma);
1769
1770 /* Byte swap page tables if necessary */
1771 sbp2util_cpu_to_be32_buffer(sg_element,
1772 (sizeof(struct sbp2_unrestricted_page_table)) *
1773 sg_count);
1774 }
1775}
1776
1777static void sbp2_prep_command_orb_no_sg(struct sbp2_command_orb *orb,
1778 struct sbp2scsi_host_info *hi,
1779 struct sbp2_command_info *command,
1780 struct scatterlist *sgpnt,
1781 u32 orb_direction,
1782 unsigned int scsi_request_bufflen,
1783 void *scsi_request_buffer,
1784 enum dma_data_direction dma_dir)
1785{
1786 command->dma_dir = dma_dir;
1787 command->dma_size = scsi_request_bufflen;
1788 command->dma_type = CMD_DMA_SINGLE;
1789 command->cmd_dma = pci_map_single(hi->host->pdev, scsi_request_buffer,
1790 command->dma_size, command->dma_dir);
1791 orb->data_descriptor_hi = ORB_SET_NODE_ID(hi->host->node_id);
1792 orb->misc |= ORB_SET_DIRECTION(orb_direction);
1793
1794 SBP2_DMA_ALLOC("single bulk");
1795
1796 /*
1797 * Handle case where we get a command w/o s/g enabled (but
1798 * check for transfers larger than 64K)
1799 */
1800 if (scsi_request_bufflen <= SBP2_MAX_SG_ELEMENT_LENGTH) {
1801
1802 orb->data_descriptor_lo = command->cmd_dma;
1803 orb->misc |= ORB_SET_DATA_SIZE(scsi_request_bufflen);
1804
1805 } else {
1806 struct sbp2_unrestricted_page_table *sg_element =
1807 &command->scatter_gather_element[0];
1808 u32 sg_count, sg_len;
1809 dma_addr_t sg_addr;
1810
1811 /*
1812 * Need to turn this into page tables, since the
1813 * buffer is too large.
1814 */
1815 orb->data_descriptor_lo = command->sge_dma;
1816
1817 /* Use page tables (s/g) */
1818 orb->misc |= ORB_SET_PAGE_TABLE_PRESENT(0x1);
1819
1820 /*
1821 * fill out our sbp-2 page tables (and split up
1822 * the large buffer)
1823 */
1824 sg_count = 0;
1825 sg_len = scsi_request_bufflen;
1826 sg_addr = command->cmd_dma;
1827 while (sg_len) {
1828 sg_element[sg_count].segment_base_lo = sg_addr;
1829 if (sg_len > SBP2_MAX_SG_ELEMENT_LENGTH) {
1830 sg_element[sg_count].length_segment_base_hi =
1831 PAGE_TABLE_SET_SEGMENT_LENGTH(SBP2_MAX_SG_ELEMENT_LENGTH);
1832 sg_addr += SBP2_MAX_SG_ELEMENT_LENGTH;
1833 sg_len -= SBP2_MAX_SG_ELEMENT_LENGTH;
1834 } else {
1835 sg_element[sg_count].length_segment_base_hi =
1836 PAGE_TABLE_SET_SEGMENT_LENGTH(sg_len);
1837 sg_len = 0;
1838 }
1839 sg_count++;
1840 }
1841
1842 /* Number of page table (s/g) elements */
1843 orb->misc |= ORB_SET_DATA_SIZE(sg_count);
1844
1845 sbp2util_packet_dump(sg_element,
1846 (sizeof(struct sbp2_unrestricted_page_table)) * sg_count,
1847 "sbp2 s/g list", command->sge_dma);
1848
1849 /* Byte swap page tables if necessary */
1850 sbp2util_cpu_to_be32_buffer(sg_element,
1851 (sizeof(struct sbp2_unrestricted_page_table)) *
1852 sg_count);
1853 }
1854}
1855
1da177e4
LT		 1856/*
1857 * This function is called to create the actual command orb and s/g list
1858 * out of the scsi command itself.
1859 */
cf8d2c09
SR		 1860static void sbp2_create_command_orb(struct scsi_id_instance_data *scsi_id,
1861 struct sbp2_command_info *command,
1862 unchar *scsi_cmd,
1863 unsigned int scsi_use_sg,
1864 unsigned int scsi_request_bufflen,
1865 void *scsi_request_buffer,
1866 enum dma_data_direction dma_dir)
1da177e4
LT		 1867{
1868 struct sbp2scsi_host_info *hi = scsi_id->hi;
a237f35f 1869 struct scatterlist *sgpnt = (struct scatterlist *)scsi_request_buffer;
1da177e4 1870 struct sbp2_command_orb *command_orb = &command->command_orb;
cf8d2c09 1871 u32 orb_direction;
1da177e4
LT		 1872
1873 /*
1874 * Set-up our command ORB..
1875 *
1876 * NOTE: We're doing unrestricted page tables (s/g), as this is
1877 * best performance (at least with the devices I have). This means
1878 * that data_size becomes the number of s/g elements, and
1879 * page_size should be zero (for unrestricted).
1880 */
1881 command_orb->next_ORB_hi = ORB_SET_NULL_PTR(1);
1882 command_orb->next_ORB_lo = 0x0;
1883 command_orb->misc = ORB_SET_MAX_PAYLOAD(scsi_id->max_payload_size);
1884 command_orb->misc |= ORB_SET_SPEED(scsi_id->speed_code);
a237f35f 1885 command_orb->misc |= ORB_SET_NOTIFY(1); /* Notify us when complete */
1da177e4 1886
43863eba 1887 if (dma_dir == DMA_NONE)
a237f35f 1888 orb_direction = ORB_DIRECTION_NO_DATA_TRANSFER;
43863eba 1889 else if (dma_dir == DMA_TO_DEVICE && scsi_request_bufflen)
a237f35f 1890 orb_direction = ORB_DIRECTION_WRITE_TO_MEDIA;
43863eba 1891 else if (dma_dir == DMA_FROM_DEVICE && scsi_request_bufflen)
a237f35f 1892 orb_direction = ORB_DIRECTION_READ_FROM_MEDIA;
43863eba
SR		 1893 else {
1894 SBP2_WARN("Falling back to DMA_NONE");
1895 orb_direction = ORB_DIRECTION_NO_DATA_TRANSFER;
1da177e4
LT		 1896 }
1897
cf8d2c09 1898 /* Set-up our pagetable stuff */
1da177e4 1899 if (orb_direction == ORB_DIRECTION_NO_DATA_TRANSFER) {
1da177e4 1900 SBP2_DEBUG("No data transfer");
1da177e4
LT		 1901 command_orb->data_descriptor_hi = 0x0;
1902 command_orb->data_descriptor_lo = 0x0;
1903 command_orb->misc |= ORB_SET_DIRECTION(1);
1da177e4 1904 } else if (scsi_use_sg) {
1da177e4 1905 SBP2_DEBUG("Use scatter/gather");
cf8d2c09
SR		 1906 sbp2_prep_command_orb_sg(command_orb, hi, command, scsi_use_sg,
1907 sgpnt, orb_direction, dma_dir);
1da177e4 1908 } else {
1da177e4 1909 SBP2_DEBUG("No scatter/gather");
cf8d2c09
SR		 1910 sbp2_prep_command_orb_no_sg(command_orb, hi, command, sgpnt,
1911 orb_direction, scsi_request_bufflen,
1912 scsi_request_buffer, dma_dir);
1da177e4
LT		 1913 }
1914
cf8d2c09 1915 /* Byte swap command ORB if necessary */
1da177e4
LT		 1916 sbp2util_cpu_to_be32_buffer(command_orb, sizeof(struct sbp2_command_orb));
1917
cf8d2c09 1918 /* Put our scsi command in the command ORB */
1da177e4
LT		 1919 memset(command_orb->cdb, 0, 12);
1920 memcpy(command_orb->cdb, scsi_cmd, COMMAND_SIZE(*scsi_cmd));
1da177e4
LT		 1921}
1922
1923/*
1924 * This function is called in order to begin a regular SBP-2 command.
1925 */
1926static int sbp2_link_orb_command(struct scsi_id_instance_data *scsi_id,
1927 struct sbp2_command_info *command)
1928{
1929 struct sbp2scsi_host_info *hi = scsi_id->hi;
1930 struct sbp2_command_orb *command_orb = &command->command_orb;
1931 struct node_entry *ne = scsi_id->ne;
1932 u64 addr;
1933
1934 outstanding_orb_incr;
1935 SBP2_ORB_DEBUG("sending command orb %p, total orbs = %x",
a237f35f 1936 command_orb, global_outstanding_command_orbs);
1da177e4
LT		 1937
1938 pci_dma_sync_single_for_device(hi->host->pdev, command->command_orb_dma,
1939 sizeof(struct sbp2_command_orb),
1940 PCI_DMA_BIDIRECTIONAL);
1941 pci_dma_sync_single_for_device(hi->host->pdev, command->sge_dma,
1942 sizeof(command->scatter_gather_element),
1943 PCI_DMA_BIDIRECTIONAL);
1944 /*
1945 * Check to see if there are any previous orbs to use
1946 */
1947 if (scsi_id->last_orb == NULL) {
1948 quadlet_t data[2];
1949
1950 /*
1951 * Ok, let's write to the target's management agent register
1952 */
1953 addr = scsi_id->sbp2_command_block_agent_addr + SBP2_ORB_POINTER_OFFSET;
1954 data[0] = ORB_SET_NODE_ID(hi->host->node_id);
1955 data[1] = command->command_orb_dma;
1956 sbp2util_cpu_to_be32_buffer(data, 8);
1957
1958 SBP2_ORB_DEBUG("write command agent, command orb %p", command_orb);
1959
1960 if (sbp2util_node_write_no_wait(ne, addr, data, 8) < 0) {
1961 SBP2_ERR("sbp2util_node_write_no_wait failed.\n");
1962 return -EIO;
1963 }
1964
1965 SBP2_ORB_DEBUG("write command agent complete");
1966
1967 scsi_id->last_orb = command_orb;
1968 scsi_id->last_orb_dma = command->command_orb_dma;
1969
1970 } else {
1971 quadlet_t data;
1972
1973 /*
1974 * We have an orb already sent (maybe or maybe not
1975 * processed) that we can append this orb to. So do so,
1976 * and ring the doorbell. Have to be very careful
1977 * modifying these next orb pointers, as they are accessed
1978 * both by the sbp2 device and us.
1979 */
1980 scsi_id->last_orb->next_ORB_lo =
a237f35f 1981 cpu_to_be32(command->command_orb_dma);
1da177e4
LT		 1982 /* Tells hardware that this pointer is valid */
1983 scsi_id->last_orb->next_ORB_hi = 0x0;
a237f35f
SR		 1984 pci_dma_sync_single_for_device(hi->host->pdev,
1985 scsi_id->last_orb_dma,
1da177e4
LT		 1986 sizeof(struct sbp2_command_orb),
1987 PCI_DMA_BIDIRECTIONAL);
1988
1989 /*
1990 * Ring the doorbell
1991 */
1992 data = cpu_to_be32(command->command_orb_dma);
1993 addr = scsi_id->sbp2_command_block_agent_addr + SBP2_DOORBELL_OFFSET;
1994
1995 SBP2_ORB_DEBUG("ring doorbell, command orb %p", command_orb);
1996
1997 if (sbp2util_node_write_no_wait(ne, addr, &data, 4) < 0) {
1998 SBP2_ERR("sbp2util_node_write_no_wait failed");
a237f35f 1999 return -EIO;
1da177e4
LT		 2000 }
2001
2002 scsi_id->last_orb = command_orb;
2003 scsi_id->last_orb_dma = command->command_orb_dma;
2004
2005 }
a237f35f 2006 return 0;
1da177e4
LT		 2007}
2008
2009/*
2010 * This function is called in order to begin a regular SBP-2 command.
2011 */
2012static int sbp2_send_command(struct scsi_id_instance_data *scsi_id,
2013 struct scsi_cmnd *SCpnt,
2014 void (*done)(struct scsi_cmnd *))
2015{
2016 unchar *cmd = (unchar *) SCpnt->cmnd;
2017 unsigned int request_bufflen = SCpnt->request_bufflen;
2018 struct sbp2_command_info *command;
2019
2020 SBP2_DEBUG("sbp2_send_command");
2021#if (CONFIG_IEEE1394_SBP2_DEBUG >= 2) || defined(CONFIG_IEEE1394_SBP2_PACKET_DUMP)
2022 printk("[scsi command]\n ");
2023 scsi_print_command(SCpnt);
2024#endif
2025 SBP2_DEBUG("SCSI transfer size = %x", request_bufflen);
2026 SBP2_DEBUG("SCSI s/g elements = %x", (unsigned int)SCpnt->use_sg);
2027
2028 /*
2029 * Allocate a command orb and s/g structure
2030 */
2031 command = sbp2util_allocate_command_orb(scsi_id, SCpnt, done);
2032 if (!command) {
a237f35f 2033 return -EIO;
1da177e4
LT		 2034 }
2035
1da177e4
LT		 2036 /*
2037 * Now actually fill in the comamnd orb and sbp2 s/g list
2038 */
2039 sbp2_create_command_orb(scsi_id, command, cmd, SCpnt->use_sg,
2040 request_bufflen, SCpnt->request_buffer,
2041 SCpnt->sc_data_direction);
1da177e4
LT		 2042
2043 sbp2util_packet_dump(&command->command_orb, sizeof(struct sbp2_command_orb),
2044 "sbp2 command orb", command->command_orb_dma);
2045
2046 /*
2047 * Initialize status fifo
2048 */
2049 memset(&scsi_id->status_block, 0, sizeof(struct sbp2_status_block));
2050
2051 /*
2052 * Link up the orb, and ring the doorbell if needed
2053 */
2054 sbp2_link_orb_command(scsi_id, command);
2055
a237f35f 2056 return 0;
1da177e4
LT		 2057}
2058
1da177e4
LT		 2059/*
2060 * Translates SBP-2 status into SCSI sense data for check conditions
2061 */
2062static unsigned int sbp2_status_to_sense_data(unchar *sbp2_status, unchar *sense_data)
2063{
2064 SBP2_DEBUG("sbp2_status_to_sense_data");
2065
2066 /*
2067 * Ok, it's pretty ugly... ;-)
2068 */
2069 sense_data[0] = 0x70;
2070 sense_data[1] = 0x0;
2071 sense_data[2] = sbp2_status[9];
2072 sense_data[3] = sbp2_status[12];
2073 sense_data[4] = sbp2_status[13];
2074 sense_data[5] = sbp2_status[14];
2075 sense_data[6] = sbp2_status[15];
2076 sense_data[7] = 10;
2077 sense_data[8] = sbp2_status[16];
2078 sense_data[9] = sbp2_status[17];
2079 sense_data[10] = sbp2_status[18];
2080 sense_data[11] = sbp2_status[19];
2081 sense_data[12] = sbp2_status[10];
2082 sense_data[13] = sbp2_status[11];
2083 sense_data[14] = sbp2_status[20];
2084 sense_data[15] = sbp2_status[21];
2085
a237f35f 2086 return sbp2_status[8] & 0x3f; /* return scsi status */
1da177e4
LT		 2087}
2088
2089/*
2090 * This function is called after a command is completed, in order to do any necessary SBP-2
2091 * response data translations for the SCSI stack
2092 */
a237f35f 2093static void sbp2_check_sbp2_response(struct scsi_id_instance_data *scsi_id,
1da177e4
LT		 2094 struct scsi_cmnd *SCpnt)
2095{
2096 u8 *scsi_buf = SCpnt->request_buffer;
1da177e4
LT		 2097
2098 SBP2_DEBUG("sbp2_check_sbp2_response");
2099
e30809fd 2100 if (SCpnt->cmnd[0] == INQUIRY && (SCpnt->cmnd[1] & 3) == 0) {
a237f35f
SR		 2101 /*
2102 * Make sure data length is ok. Minimum length is 36 bytes
2103 */
2104 if (scsi_buf[4] == 0) {
2105 scsi_buf[4] = 36 - 5;
2106 }
1da177e4 2107
a237f35f
SR		 2108 /*
2109 * Fix ansi revision and response data format
2110 */
2111 scsi_buf[2] |= 2;
2112 scsi_buf[3] = (scsi_buf[3] & 0xf0) | 2;
1da177e4 2113 }
1da177e4
LT		 2114}
2115
2116/*
2117 * This function deals with status writes from the SBP-2 device
2118 */
2119static int sbp2_handle_status_write(struct hpsb_host *host, int nodeid, int destid,
2120 quadlet_t *data, u64 addr, size_t length, u16 fl)
2121{
2122 struct sbp2scsi_host_info *hi;
2123 struct scsi_id_instance_data *scsi_id = NULL, *scsi_id_tmp;
1da177e4
LT		 2124 struct scsi_cmnd *SCpnt = NULL;
2125 u32 scsi_status = SBP2_SCSI_STATUS_GOOD;
2126 struct sbp2_command_info *command;
79456197 2127 unsigned long flags;
1da177e4
LT		 2128
2129 SBP2_DEBUG("sbp2_handle_status_write");
2130
2131 sbp2util_packet_dump(data, length, "sbp2 status write by device", (u32)addr);
2132
2133 if (!host) {
2134 SBP2_ERR("host is NULL - this is bad!");
a237f35f 2135 return RCODE_ADDRESS_ERROR;
1da177e4
LT		 2136 }
2137
2138 hi = hpsb_get_hostinfo(&sbp2_highlevel, host);
2139
2140 if (!hi) {
2141 SBP2_ERR("host info is NULL - this is bad!");
a237f35f 2142 return RCODE_ADDRESS_ERROR;
1da177e4
LT		 2143 }
2144
2145 /*
35bdddb8
SR		 2146 * Find our scsi_id structure by looking at the status fifo address
2147 * written to by the sbp2 device.
1da177e4 2148 */
1da177e4 2149 list_for_each_entry(scsi_id_tmp, &hi->scsi_ids, scsi_list) {
35bdddb8
SR		 2150 if (scsi_id_tmp->ne->nodeid == nodeid &&
2151 scsi_id_tmp->status_fifo_addr == addr) {
1da177e4
LT		 2152 scsi_id = scsi_id_tmp;
2153 break;
2154 }
2155 }
2156
2157 if (!scsi_id) {
2158 SBP2_ERR("scsi_id is NULL - device is gone?");
a237f35f 2159 return RCODE_ADDRESS_ERROR;
1da177e4
LT		 2160 }
2161
2162 /*
2163 * Put response into scsi_id status fifo...
2164 */
2165 memcpy(&scsi_id->status_block, data, length);
2166
2167 /*
2168 * Byte swap first two quadlets (8 bytes) of status for processing
2169 */
2170 sbp2util_be32_to_cpu_buffer(&scsi_id->status_block, 8);
2171
2172 /*
2173 * Handle command ORB status here if necessary. First, need to match status with command.
2174 */
2175 command = sbp2util_find_command_for_orb(scsi_id, scsi_id->status_block.ORB_offset_lo);
2176 if (command) {
2177
2178 SBP2_DEBUG("Found status for command ORB");
2179 pci_dma_sync_single_for_cpu(hi->host->pdev, command->command_orb_dma,
2180 sizeof(struct sbp2_command_orb),
2181 PCI_DMA_BIDIRECTIONAL);
2182 pci_dma_sync_single_for_cpu(hi->host->pdev, command->sge_dma,
2183 sizeof(command->scatter_gather_element),
2184 PCI_DMA_BIDIRECTIONAL);
2185
2186 SBP2_ORB_DEBUG("matched command orb %p", &command->command_orb);
2187 outstanding_orb_decr;
2188
2189 /*
2190 * Matched status with command, now grab scsi command pointers and check status
2191 */
2192 SCpnt = command->Current_SCpnt;
2193 sbp2util_mark_command_completed(scsi_id, command);
2194
2195 if (SCpnt) {
2196
2197 /*
2198 * See if the target stored any scsi status information
2199 */
2200 if (STATUS_GET_LENGTH(scsi_id->status_block.ORB_offset_hi_misc) > 1) {
2201 /*
2202 * Translate SBP-2 status to SCSI sense data
2203 */
2204 SBP2_DEBUG("CHECK CONDITION");
2205 scsi_status = sbp2_status_to_sense_data((unchar *)&scsi_id->status_block, SCpnt->sense_buffer);
2206 }
2207
2208 /*
2209 * Check to see if the dead bit is set. If so, we'll have to initiate
2210 * a fetch agent reset.
2211 */
2212 if (STATUS_GET_DEAD_BIT(scsi_id->status_block.ORB_offset_hi_misc)) {
2213
2214 /*
2215 * Initiate a fetch agent reset.
2216 */
2217 SBP2_DEBUG("Dead bit set - initiating fetch agent reset");
2218 sbp2_agent_reset(scsi_id, 0);
2219 }
2220
2221 SBP2_ORB_DEBUG("completing command orb %p", &command->command_orb);
2222 }
2223
2224 /*
2225 * Check here to see if there are no commands in-use. If there are none, we can
2226 * null out last orb so that next time around we write directly to the orb pointer...
2227 * Quick start saves one 1394 bus transaction.
2228 */
79456197 2229 spin_lock_irqsave(&scsi_id->sbp2_command_orb_lock, flags);
1da177e4
LT		 2230 if (list_empty(&scsi_id->sbp2_command_orb_inuse)) {
2231 scsi_id->last_orb = NULL;
2232 }
79456197 2233 spin_unlock_irqrestore(&scsi_id->sbp2_command_orb_lock, flags);
1da177e4
LT		 2234
2235 } else {
2236
2237 /*
2238 * It's probably a login/logout/reconnect status.
2239 */
2240 if ((scsi_id->login_orb_dma == scsi_id->status_block.ORB_offset_lo) ||
2241 (scsi_id->query_logins_orb_dma == scsi_id->status_block.ORB_offset_lo) ||
2242 (scsi_id->reconnect_orb_dma == scsi_id->status_block.ORB_offset_lo) ||
2243 (scsi_id->logout_orb_dma == scsi_id->status_block.ORB_offset_lo)) {
2244 atomic_set(&scsi_id->sbp2_login_complete, 1);
2245 }
2246 }
2247
2248 if (SCpnt) {
2249
2250 /* Complete the SCSI command. */
2251 SBP2_DEBUG("Completing SCSI command");
2252 sbp2scsi_complete_command(scsi_id, scsi_status, SCpnt,
2253 command->Current_done);
2254 SBP2_ORB_DEBUG("command orb completed");
2255 }
2256
a237f35f 2257 return RCODE_COMPLETE;
1da177e4
LT		 2258}
2259
1da177e4
LT		 2260/**************************************
2261 * SCSI interface related section
2262 **************************************/
2263
2264/*
2265 * This routine is the main request entry routine for doing I/O. It is
2266 * called from the scsi stack directly.
2267 */
2268static int sbp2scsi_queuecommand(struct scsi_cmnd *SCpnt,
2269 void (*done)(struct scsi_cmnd *))
2270{
2271 struct scsi_id_instance_data *scsi_id =
2272 (struct scsi_id_instance_data *)SCpnt->device->host->hostdata[0];
2273 struct sbp2scsi_host_info *hi;
abd559b1 2274 int result = DID_NO_CONNECT << 16;
1da177e4
LT		 2275
2276 SBP2_DEBUG("sbp2scsi_queuecommand");
2277
abd559b1
JM		 2278 if (!sbp2util_node_is_available(scsi_id))
2279 goto done;
1da177e4
LT		 2280
2281 hi = scsi_id->hi;
2282
2283 if (!hi) {
2284 SBP2_ERR("sbp2scsi_host_info is NULL - this is bad!");
abd559b1 2285 goto done;
1da177e4
LT		 2286 }
2287
2288 /*
2289 * Until we handle multiple luns, just return selection time-out
2290 * to any IO directed at non-zero LUNs
2291 */
abd559b1
JM		 2292 if (SCpnt->device->lun)
2293 goto done;
1da177e4
LT		 2294
2295 /*
2296 * Check for request sense command, and handle it here
2297 * (autorequest sense)
2298 */
2299 if (SCpnt->cmnd[0] == REQUEST_SENSE) {
2300 SBP2_DEBUG("REQUEST_SENSE");
2301 memcpy(SCpnt->request_buffer, SCpnt->sense_buffer, SCpnt->request_bufflen);
2302 memset(SCpnt->sense_buffer, 0, sizeof(SCpnt->sense_buffer));
2303 sbp2scsi_complete_command(scsi_id, SBP2_SCSI_STATUS_GOOD, SCpnt, done);
abd559b1 2304 return 0;
1da177e4
LT		 2305 }
2306
2307 /*
2308 * Check to see if we are in the middle of a bus reset.
2309 */
2310 if (!hpsb_node_entry_valid(scsi_id->ne)) {
2311 SBP2_ERR("Bus reset in progress - rejecting command");
abd559b1
JM		 2312 result = DID_BUS_BUSY << 16;
2313 goto done;
1da177e4
LT		 2314 }
2315
43863eba
SR		 2316 /*
2317 * Bidirectional commands are not yet implemented,
2318 * and unknown transfer direction not handled.
2319 */
2320 if (SCpnt->sc_data_direction == DMA_BIDIRECTIONAL) {
2321 SBP2_ERR("Cannot handle DMA_BIDIRECTIONAL - rejecting command");
2322 result = DID_ERROR << 16;
2323 goto done;
2324 }
2325
1da177e4
LT		 2326 /*
2327 * Try and send our SCSI command
2328 */
2329 if (sbp2_send_command(scsi_id, SCpnt, done)) {
2330 SBP2_ERR("Error sending SCSI command");
2331 sbp2scsi_complete_command(scsi_id, SBP2_SCSI_STATUS_SELECTION_TIMEOUT,
2332 SCpnt, done);
2333 }
abd559b1 2334 return 0;
1da177e4 2335
abd559b1
JM		 2336done:
2337 SCpnt->result = result;
2338 done(SCpnt);
2339 return 0;
1da177e4
LT		 2340}
2341
2342/*
2343 * This function is called in order to complete all outstanding SBP-2
2344 * commands (in case of resets, etc.).
2345 */
2346static void sbp2scsi_complete_all_commands(struct scsi_id_instance_data *scsi_id,
2347 u32 status)
2348{
2349 struct sbp2scsi_host_info *hi = scsi_id->hi;
2350 struct list_head *lh;
2351 struct sbp2_command_info *command;
79456197 2352 unsigned long flags;
1da177e4
LT		 2353
2354 SBP2_DEBUG("sbp2scsi_complete_all_commands");
2355
79456197 2356 spin_lock_irqsave(&scsi_id->sbp2_command_orb_lock, flags);
1da177e4
LT		 2357 while (!list_empty(&scsi_id->sbp2_command_orb_inuse)) {
2358 SBP2_DEBUG("Found pending command to complete");
2359 lh = scsi_id->sbp2_command_orb_inuse.next;
2360 command = list_entry(lh, struct sbp2_command_info, list);
2361 pci_dma_sync_single_for_cpu(hi->host->pdev, command->command_orb_dma,
2362 sizeof(struct sbp2_command_orb),
2363 PCI_DMA_BIDIRECTIONAL);
2364 pci_dma_sync_single_for_cpu(hi->host->pdev, command->sge_dma,
2365 sizeof(command->scatter_gather_element),
2366 PCI_DMA_BIDIRECTIONAL);
2367 sbp2util_mark_command_completed(scsi_id, command);
2368 if (command->Current_SCpnt) {
2369 command->Current_SCpnt->result = status << 16;
2370 command->Current_done(command->Current_SCpnt);
2371 }
2372 }
79456197 2373 spin_unlock_irqrestore(&scsi_id->sbp2_command_orb_lock, flags);
1da177e4
LT		 2374
2375 return;
2376}
2377
2378/*
2379 * This function is called in order to complete a regular SBP-2 command.
2380 *
2381 * This can be called in interrupt context.
2382 */
2383static void sbp2scsi_complete_command(struct scsi_id_instance_data *scsi_id,
2384 u32 scsi_status, struct scsi_cmnd *SCpnt,
2385 void (*done)(struct scsi_cmnd *))
2386{
1da177e4
LT		 2387 SBP2_DEBUG("sbp2scsi_complete_command");
2388
2389 /*
2390 * Sanity
2391 */
2392 if (!SCpnt) {
2393 SBP2_ERR("SCpnt is NULL");
2394 return;
2395 }
2396
2397 /*
2398 * If a bus reset is in progress and there was an error, don't
2399 * complete the command, just let it get retried at the end of the
2400 * bus reset.
2401 */
a237f35f
SR		 2402 if (!hpsb_node_entry_valid(scsi_id->ne)
2403 && (scsi_status != SBP2_SCSI_STATUS_GOOD)) {
1da177e4
LT		 2404 SBP2_ERR("Bus reset in progress - retry command later");
2405 return;
2406 }
a237f35f 2407
1da177e4
LT		 2408 /*
2409 * Switch on scsi status
2410 */
2411 switch (scsi_status) {
a237f35f
SR		 2412 case SBP2_SCSI_STATUS_GOOD:
2413 SCpnt->result = DID_OK;
2414 break;
1da177e4 2415
a237f35f
SR		 2416 case SBP2_SCSI_STATUS_BUSY:
2417 SBP2_ERR("SBP2_SCSI_STATUS_BUSY");
2418 SCpnt->result = DID_BUS_BUSY << 16;
2419 break;
1da177e4 2420
a237f35f
SR		 2421 case SBP2_SCSI_STATUS_CHECK_CONDITION:
2422 SBP2_DEBUG("SBP2_SCSI_STATUS_CHECK_CONDITION");
2423 SCpnt->result = CHECK_CONDITION << 1;
1da177e4 2424
a237f35f
SR		 2425 /*
2426 * Debug stuff
2427 */
1da177e4 2428#if CONFIG_IEEE1394_SBP2_DEBUG >= 1
a237f35f
SR		 2429 scsi_print_command(SCpnt);
2430 scsi_print_sense("bh", SCpnt);
1da177e4
LT		 2431#endif
2432
a237f35f 2433 break;
1da177e4 2434
a237f35f
SR		 2435 case SBP2_SCSI_STATUS_SELECTION_TIMEOUT:
2436 SBP2_ERR("SBP2_SCSI_STATUS_SELECTION_TIMEOUT");
2437 SCpnt->result = DID_NO_CONNECT << 16;
2438 scsi_print_command(SCpnt);
2439 break;
1da177e4 2440
a237f35f
SR		 2441 case SBP2_SCSI_STATUS_CONDITION_MET:
2442 case SBP2_SCSI_STATUS_RESERVATION_CONFLICT:
2443 case SBP2_SCSI_STATUS_COMMAND_TERMINATED:
2444 SBP2_ERR("Bad SCSI status = %x", scsi_status);
2445 SCpnt->result = DID_ERROR << 16;
2446 scsi_print_command(SCpnt);
2447 break;
1da177e4 2448
a237f35f
SR		 2449 default:
2450 SBP2_ERR("Unsupported SCSI status = %x", scsi_status);
2451 SCpnt->result = DID_ERROR << 16;
1da177e4
LT		 2452 }
2453
2454 /*
2455 * Take care of any sbp2 response data mucking here (RBC stuff, etc.)
2456 */
2457 if (SCpnt->result == DID_OK) {
2458 sbp2_check_sbp2_response(scsi_id, SCpnt);
2459 }
2460
2461 /*
2462 * If a bus reset is in progress and there was an error, complete
2463 * the command as busy so that it will get retried.
2464 */
a237f35f
SR		 2465 if (!hpsb_node_entry_valid(scsi_id->ne)
2466 && (scsi_status != SBP2_SCSI_STATUS_GOOD)) {
1da177e4
LT		 2467 SBP2_ERR("Completing command with busy (bus reset)");
2468 SCpnt->result = DID_BUS_BUSY << 16;
2469 }
2470
2471 /*
2472 * If a unit attention occurs, return busy status so it gets
2473 * retried... it could have happened because of a 1394 bus reset
2474 * or hot-plug...
2475 */
2476#if 0
2477 if ((scsi_status == SBP2_SCSI_STATUS_CHECK_CONDITION) &&
2478 (SCpnt->sense_buffer[2] == UNIT_ATTENTION)) {
2479 SBP2_DEBUG("UNIT ATTENTION - return busy");
2480 SCpnt->result = DID_BUS_BUSY << 16;
2481 }
2482#endif
2483
2484 /*
2485 * Tell scsi stack that we're done with this command
2486 */
a237f35f 2487 done(SCpnt);
1da177e4
LT		 2488}
2489
abd559b1 2490static int sbp2scsi_slave_alloc(struct scsi_device *sdev)
1da177e4 2491{
a80614d1
SR		 2492 struct scsi_id_instance_data *scsi_id =
2493 (struct scsi_id_instance_data *)sdev->host->hostdata[0];
2494
2495 scsi_id->sdev = sdev;
2496
2497 if (force_inquiry_hack ||
2498 scsi_id->workarounds & SBP2_BREAKAGE_INQUIRY_HACK) {
2499 sdev->inquiry_len = 36;
2500 sdev->skip_ms_page_8 = 1;
2501 }
abd559b1
JM		 2502 return 0;
2503}
2504
abd559b1
JM		 2505static int sbp2scsi_slave_configure(struct scsi_device *sdev)
2506{
2507 blk_queue_dma_alignment(sdev->request_queue, (512 - 1));
365c786f
BC		 2508 sdev->use_10_for_rw = 1;
2509 sdev->use_10_for_ms = 1;
1da177e4
LT		 2510 return 0;
2511}
2512
abd559b1
JM		 2513static void sbp2scsi_slave_destroy(struct scsi_device *sdev)
2514{
2515 ((struct scsi_id_instance_data *)sdev->host->hostdata[0])->sdev = NULL;
2516 return;
2517}
2518
1da177e4
LT		 2519/*
2520 * Called by scsi stack when something has really gone wrong. Usually
2521 * called when a command has timed-out for some reason.
2522 */
2523static int sbp2scsi_abort(struct scsi_cmnd *SCpnt)
2524{
2525 struct scsi_id_instance_data *scsi_id =
2526 (struct scsi_id_instance_data *)SCpnt->device->host->hostdata[0];
2527 struct sbp2scsi_host_info *hi = scsi_id->hi;
2528 struct sbp2_command_info *command;
2529
2530 SBP2_ERR("aborting sbp2 command");
2531 scsi_print_command(SCpnt);
2532
abd559b1 2533 if (sbp2util_node_is_available(scsi_id)) {
1da177e4
LT		 2534
2535 /*
2536 * Right now, just return any matching command structures
2537 * to the free pool.
2538 */
2539 command = sbp2util_find_command_for_SCpnt(scsi_id, SCpnt);
2540 if (command) {
2541 SBP2_DEBUG("Found command to abort");
2542 pci_dma_sync_single_for_cpu(hi->host->pdev,
2543 command->command_orb_dma,
2544 sizeof(struct sbp2_command_orb),
2545 PCI_DMA_BIDIRECTIONAL);
2546 pci_dma_sync_single_for_cpu(hi->host->pdev,
2547 command->sge_dma,
2548 sizeof(command->scatter_gather_element),
2549 PCI_DMA_BIDIRECTIONAL);
2550 sbp2util_mark_command_completed(scsi_id, command);
2551 if (command->Current_SCpnt) {
2552 command->Current_SCpnt->result = DID_ABORT << 16;
2553 command->Current_done(command->Current_SCpnt);
2554 }
2555 }
2556
2557 /*
2558 * Initiate a fetch agent reset.
2559 */
2560 sbp2_agent_reset(scsi_id, 0);
2561 sbp2scsi_complete_all_commands(scsi_id, DID_BUS_BUSY);
2562 }
2563
a237f35f 2564 return SUCCESS;
1da177e4
LT		 2565}
2566
2567/*
2568 * Called by scsi stack when something has really gone wrong.
2569 */
abd559b1 2570static int sbp2scsi_reset(struct scsi_cmnd *SCpnt)
1da177e4
LT		 2571{
2572 struct scsi_id_instance_data *scsi_id =
2573 (struct scsi_id_instance_data *)SCpnt->device->host->hostdata[0];
2574
2575 SBP2_ERR("reset requested");
2576
abd559b1 2577 if (sbp2util_node_is_available(scsi_id)) {
1da177e4
LT		 2578 SBP2_ERR("Generating sbp2 fetch agent reset");
2579 sbp2_agent_reset(scsi_id, 0);
2580 }
2581
abd559b1 2582 return SUCCESS;
94d0e7b8
JG		 2583}
2584
a237f35f
SR		 2585static ssize_t sbp2_sysfs_ieee1394_id_show(struct device *dev,
2586 struct device_attribute *attr,
2587 char *buf)
1da177e4
LT		 2588{
2589 struct scsi_device *sdev;
2590 struct scsi_id_instance_data *scsi_id;
2591 int lun;
2592
2593 if (!(sdev = to_scsi_device(dev)))
2594 return 0;
2595
2596 if (!(scsi_id = (struct scsi_id_instance_data *)sdev->host->hostdata[0]))
2597 return 0;
2598
e309fc6d 2599 lun = ORB_SET_LUN(scsi_id->sbp2_lun);
1da177e4
LT		 2600
2601 return sprintf(buf, "%016Lx:%d:%d\n", (unsigned long long)scsi_id->ne->guid,
2602 scsi_id->ud->id, lun);
2603}
2604static DEVICE_ATTR(ieee1394_id, S_IRUGO, sbp2_sysfs_ieee1394_id_show, NULL);
2605
2606static struct device_attribute *sbp2_sysfs_sdev_attrs[] = {
2607 &dev_attr_ieee1394_id,
2608 NULL
2609};
2610
2611MODULE_AUTHOR("Ben Collins <bcollins@debian.org>");
2612MODULE_DESCRIPTION("IEEE-1394 SBP-2 protocol driver");
2613MODULE_SUPPORTED_DEVICE(SBP2_DEVICE_NAME);
2614MODULE_LICENSE("GPL");
2615
2616/* SCSI host template */
2617static struct scsi_host_template scsi_driver_template = {
2618 .module = THIS_MODULE,
2619 .name = "SBP-2 IEEE-1394",
2620 .proc_name = SBP2_DEVICE_NAME,
1da177e4
LT		 2621 .queuecommand = sbp2scsi_queuecommand,
2622 .eh_abort_handler = sbp2scsi_abort,
2623 .eh_device_reset_handler = sbp2scsi_reset,
abd559b1 2624 .slave_alloc = sbp2scsi_slave_alloc,
1da177e4 2625 .slave_configure = sbp2scsi_slave_configure,
abd559b1 2626 .slave_destroy = sbp2scsi_slave_destroy,
1da177e4
LT		 2627 .this_id = -1,
2628 .sg_tablesize = SG_ALL,
2629 .use_clustering = ENABLE_CLUSTERING,
2630 .cmd_per_lun = SBP2_MAX_CMDS,
2631 .can_queue = SBP2_MAX_CMDS,
2632 .emulated = 1,
2633 .sdev_attrs = sbp2_sysfs_sdev_attrs,
2634};
2635
2636static int sbp2_module_init(void)
2637{
2638 int ret;
2639
2640 SBP2_DEBUG("sbp2_module_init");
2641
1da177e4
LT		 2642 /* Module load debug option to force one command at a time (serializing I/O) */
2643 if (serialize_io) {
2bab359a
JM		 2644 SBP2_INFO("Driver forced to serialize I/O (serialize_io=1)");
2645 SBP2_INFO("Try serialize_io=0 for better performance");
1da177e4
LT		 2646 scsi_driver_template.can_queue = 1;
2647 scsi_driver_template.cmd_per_lun = 1;
2648 }
2649
2650 /* Set max sectors (module load option). Default is 255 sectors. */
2651 scsi_driver_template.max_sectors = max_sectors;
2652
1da177e4
LT		 2653 /* Register our high level driver with 1394 stack */
2654 hpsb_register_highlevel(&sbp2_highlevel);
2655
2656 ret = hpsb_register_protocol(&sbp2_driver);
2657 if (ret) {
2658 SBP2_ERR("Failed to register protocol");
2659 hpsb_unregister_highlevel(&sbp2_highlevel);
2660 return ret;
2661 }
2662
2663 return 0;
2664}
2665
2666static void __exit sbp2_module_exit(void)
2667{
2668 SBP2_DEBUG("sbp2_module_exit");
2669
2670 hpsb_unregister_protocol(&sbp2_driver);
2671
2672 hpsb_unregister_highlevel(&sbp2_highlevel);
2673}
2674
2675module_init(sbp2_module_init);
2676module_exit(sbp2_module_exit);
Linux 6.x block layer and io_uring tree(s)