1	// SPDX-License-Identifier: GPL-2.0-only
2	/*
3	* ms_block.c - Sony MemoryStick (legacy) storage support
4
5	* Copyright (C) 2013 Maxim Levitsky <maximlevitsky@gmail.com>
6	*
7	* Minor portions of the driver were copied from mspro_block.c which is
8	* Copyright (C) 2007 Alex Dubov <oakad@yahoo.com>
9	*/
10	#define DRIVER_NAME "ms_block"
11	#define pr_fmt(fmt) DRIVER_NAME ": " fmt
12
13	#include <linux/module.h>
14	#include <linux/blk-mq.h>
15	#include <linux/memstick.h>
16	#include <linux/idr.h>
17	#include <linux/hdreg.h>
18	#include <linux/delay.h>
19	#include <linux/slab.h>
20	#include <linux/random.h>
21	#include <linux/bitmap.h>
22	#include <linux/scatterlist.h>
23	#include <linux/jiffies.h>
24	#include <linux/workqueue.h>
25	#include <linux/mutex.h>
26	#include "ms_block.h"
27
28	static int debug;
29	static int cache_flush_timeout = 1000;
30	static bool verify_writes;
31
32	/*
33	* Copies section of 'sg_from' starting from offset 'offset' and with length
34	* 'len' To another scatterlist of to_nents enties
35	*/
36	static size_t msb_sg_copy(struct scatterlist *sg_from,
37	struct scatterlist *sg_to, int to_nents, size_t offset, size_t len)
38	{
39	size_t copied = 0;
40
41	while (offset > 0) {
42	if (offset >= sg_from->length) {
43	if (sg_is_last(sg: sg_from))
44	return 0;
45
46	offset -= sg_from->length;
47	sg_from = sg_next(sg_from);
48	continue;
49	}
50
51	copied = min(len, sg_from->length - offset);
52	sg_set_page(sg: sg_to, page: sg_page(sg: sg_from),
53	len: copied, offset: sg_from->offset + offset);
54
55	len -= copied;
56	offset = 0;
57
58	if (sg_is_last(sg: sg_from) || !len)
59	goto out;
60
61	sg_to = sg_next(sg_to);
62	to_nents--;
63	sg_from = sg_next(sg_from);
64	}
65
66	while (len > sg_from->length && to_nents--) {
67	len -= sg_from->length;
68	copied += sg_from->length;
69
70	sg_set_page(sg: sg_to, page: sg_page(sg: sg_from),
71	len: sg_from->length, offset: sg_from->offset);
72
73	if (sg_is_last(sg: sg_from) || !len)
74	goto out;
75
76	sg_from = sg_next(sg_from);
77	sg_to = sg_next(sg_to);
78	}
79
80	if (len && to_nents) {
81	sg_set_page(sg: sg_to, page: sg_page(sg: sg_from), len, offset: sg_from->offset);
82	copied += len;
83	}
84	out:
85	sg_mark_end(sg: sg_to);
86	return copied;
87	}
88
89	/*
90	* Compares section of 'sg' starting from offset 'offset' and with length 'len'
91	* to linear buffer of length 'len' at address 'buffer'
92	* Returns 0 if equal and -1 otherwice
93	*/
94	static int msb_sg_compare_to_buffer(struct scatterlist *sg,
95	size_t offset, u8 *buffer, size_t len)
96	{
97	int retval = 0, cmplen;
98	struct sg_mapping_iter miter;
99
100	sg_miter_start(miter: &miter, sgl: sg, nents: sg_nents(sg),
101	SG_MITER_ATOMIC | SG_MITER_FROM_SG);
102
103	while (sg_miter_next(miter: &miter) && len > 0) {
104	if (offset >= miter.length) {
105	offset -= miter.length;
106	continue;
107	}
108
109	cmplen = min(miter.length - offset, len);
110	retval = memcmp(p: miter.addr + offset, q: buffer, size: cmplen) ? -1 : 0;
111	if (retval)
112	break;
113
114	buffer += cmplen;
115	len -= cmplen;
116	offset = 0;
117	}
118
119	if (!retval && len)
120	retval = -1;
121
122	sg_miter_stop(miter: &miter);
123	return retval;
124	}
125
126
127	/* Get zone at which block with logical address 'lba' lives
128	* Flash is broken into zones.
129	* Each zone consists of 512 eraseblocks, out of which in first
130	* zone 494 are used and 496 are for all following zones.
131	* Therefore zone #0 hosts blocks 0-493, zone #1 blocks 494-988, etc...
132	*/
133	static int msb_get_zone_from_lba(int lba)
134	{
135	if (lba < 494)
136	return 0;
137	return ((lba - 494) / 496) + 1;
138	}
139
140	/* Get zone of physical block. Trivial */
141	static int msb_get_zone_from_pba(int pba)
142	{
143	return pba / MS_BLOCKS_IN_ZONE;
144	}
145
146	/* Debug test to validate free block counts */
147	static int msb_validate_used_block_bitmap(struct msb_data *msb)
148	{
149	int total_free_blocks = 0;
150	int i;
151
152	if (!debug)
153	return 0;
154
155	for (i = 0; i < msb->zone_count; i++)
156	total_free_blocks += msb->free_block_count[i];
157
158	if (msb->block_count - bitmap_weight(src: msb->used_blocks_bitmap,
159	nbits: msb->block_count) == total_free_blocks)
160	return 0;
161
162	pr_err("BUG: free block counts don't match the bitmap");
163	msb->read_only = true;
164	return -EINVAL;
165	}
166
167	/* Mark physical block as used */
168	static void msb_mark_block_used(struct msb_data *msb, int pba)
169	{
170	int zone = msb_get_zone_from_pba(pba);
171
172	if (test_bit(pba, msb->used_blocks_bitmap)) {
173	pr_err(
174	"BUG: attempt to mark already used pba %d as used", pba);
175	msb->read_only = true;
176	return;
177	}
178
179	if (msb_validate_used_block_bitmap(msb))
180	return;
181
182	/* No races because all IO is single threaded */
183	__set_bit(pba, msb->used_blocks_bitmap);
184	msb->free_block_count[zone]--;
185	}
186
187	/* Mark physical block as free */
188	static void msb_mark_block_unused(struct msb_data *msb, int pba)
189	{
190	int zone = msb_get_zone_from_pba(pba);
191
192	if (!test_bit(pba, msb->used_blocks_bitmap)) {
193	pr_err("BUG: attempt to mark already unused pba %d as unused" , pba);
194	msb->read_only = true;
195	return;
196	}
197
198	if (msb_validate_used_block_bitmap(msb))
199	return;
200
201	/* No races because all IO is single threaded */
202	__clear_bit(pba, msb->used_blocks_bitmap);
203	msb->free_block_count[zone]++;
204	}
205
206	/* Invalidate current register window */
207	static void msb_invalidate_reg_window(struct msb_data *msb)
208	{
209	msb->reg_addr.w_offset = offsetof(struct ms_register, id);
210	msb->reg_addr.w_length = sizeof(struct ms_id_register);
211	msb->reg_addr.r_offset = offsetof(struct ms_register, id);
212	msb->reg_addr.r_length = sizeof(struct ms_id_register);
213	msb->addr_valid = false;
214	}
215
216	/* Start a state machine */
217	static int msb_run_state_machine(struct msb_data *msb, int (*state_func)
218	(struct memstick_dev *card, struct memstick_request **req))
219	{
220	struct memstick_dev *card = msb->card;
221
222	WARN_ON(msb->state != -1);
223	msb->int_polling = false;
224	msb->state = 0;
225	msb->exit_error = 0;
226
227	memset(&card->current_mrq, 0, sizeof(card->current_mrq));
228
229	card->next_request = state_func;
230	memstick_new_req(host: card->host);
231	wait_for_completion(&card->mrq_complete);
232
233	WARN_ON(msb->state != -1);
234	return msb->exit_error;
235	}
236
237	/* State machines call that to exit */
238	static int msb_exit_state_machine(struct msb_data *msb, int error)
239	{
240	WARN_ON(msb->state == -1);
241
242	msb->state = -1;
243	msb->exit_error = error;
244	msb->card->next_request = h_msb_default_bad;
245
246	/* Invalidate reg window on errors */
247	if (error)
248	msb_invalidate_reg_window(msb);
249
250	complete(&msb->card->mrq_complete);
251	return -ENXIO;
252	}
253
254	/* read INT register */
255	static int msb_read_int_reg(struct msb_data *msb, long timeout)
256	{
257	struct memstick_request *mrq = &msb->card->current_mrq;
258
259	WARN_ON(msb->state == -1);
260
261	if (!msb->int_polling) {
262	msb->int_timeout = jiffies +
263	msecs_to_jiffies(m: timeout == -1 ? 500 : timeout);
264	msb->int_polling = true;
265	} else if (time_after(jiffies, msb->int_timeout)) {
266	mrq->data[0] = MEMSTICK_INT_CMDNAK;
267	return 0;
268	}
269
270	if ((msb->caps & MEMSTICK_CAP_AUTO_GET_INT) &&
271	mrq->need_card_int && !mrq->error) {
272	mrq->data[0] = mrq->int_reg;
273	mrq->need_card_int = false;
274	return 0;
275	} else {
276	memstick_init_req(mrq, tpc: MS_TPC_GET_INT, NULL, length: 1);
277	return 1;
278	}
279	}
280
281	/* Read a register */
282	static int msb_read_regs(struct msb_data *msb, int offset, int len)
283	{
284	struct memstick_request *req = &msb->card->current_mrq;
285
286	if (msb->reg_addr.r_offset != offset ||
287	msb->reg_addr.r_length != len || !msb->addr_valid) {
288
289	msb->reg_addr.r_offset = offset;
290	msb->reg_addr.r_length = len;
291	msb->addr_valid = true;
292
293	memstick_init_req(mrq: req, tpc: MS_TPC_SET_RW_REG_ADRS,
294	buf: &msb->reg_addr, length: sizeof(msb->reg_addr));
295	return 0;
296	}
297
298	memstick_init_req(mrq: req, tpc: MS_TPC_READ_REG, NULL, length: len);
299	return 1;
300	}
301
302	/* Write a card register */
303	static int msb_write_regs(struct msb_data *msb, int offset, int len, void *buf)
304	{
305	struct memstick_request *req = &msb->card->current_mrq;
306
307	if (msb->reg_addr.w_offset != offset ||
308	msb->reg_addr.w_length != len || !msb->addr_valid) {
309
310	msb->reg_addr.w_offset = offset;
311	msb->reg_addr.w_length = len;
312	msb->addr_valid = true;
313
314	memstick_init_req(mrq: req, tpc: MS_TPC_SET_RW_REG_ADRS,
315	buf: &msb->reg_addr, length: sizeof(msb->reg_addr));
316	return 0;
317	}
318
319	memstick_init_req(mrq: req, tpc: MS_TPC_WRITE_REG, buf, length: len);
320	return 1;
321	}
322
323	/* Handler for absence of IO */
324	static int h_msb_default_bad(struct memstick_dev *card,
325	struct memstick_request **mrq)
326	{
327	return -ENXIO;
328	}
329
330	/*
331	* This function is a handler for reads of one page from device.
332	* Writes output to msb->current_sg, takes sector address from msb->reg.param
333	* Can also be used to read extra data only. Set params accordintly.
334	*/
335	static int h_msb_read_page(struct memstick_dev *card,
336	struct memstick_request **out_mrq)
337	{
338	struct msb_data *msb = memstick_get_drvdata(card);
339	struct memstick_request *mrq = *out_mrq = &card->current_mrq;
340	struct scatterlist sg[2];
341	u8 command, intreg;
342
343	if (mrq->error) {
344	dbg("read_page, unknown error");
345	return msb_exit_state_machine(msb, error: mrq->error);
346	}
347	again:
348	switch (msb->state) {
349	case MSB_RP_SEND_BLOCK_ADDRESS:
350	/* msb_write_regs sometimes "fails" because it needs to update
351	* the reg window, and thus it returns request for that.
352	* Then we stay in this state and retry
353	*/
354	if (!msb_write_regs(msb,
355	offsetof(struct ms_register, param),
356	len: sizeof(struct ms_param_register),
357	buf: (unsigned char *)&msb->regs.param))
358	return 0;
359
360	msb->state = MSB_RP_SEND_READ_COMMAND;
361	return 0;
362
363	case MSB_RP_SEND_READ_COMMAND:
364	command = MS_CMD_BLOCK_READ;
365	memstick_init_req(mrq, tpc: MS_TPC_SET_CMD, buf: &command, length: 1);
366	msb->state = MSB_RP_SEND_INT_REQ;
367	return 0;
368
369	case MSB_RP_SEND_INT_REQ:
370	msb->state = MSB_RP_RECEIVE_INT_REQ_RESULT;
371	/* If dont actually need to send the int read request (only in
372	* serial mode), then just fall through
373	*/
374	if (msb_read_int_reg(msb, timeout: -1))
375	return 0;
376	fallthrough;
377
378	case MSB_RP_RECEIVE_INT_REQ_RESULT:
379	intreg = mrq->data[0];
380	msb->regs.status.interrupt = intreg;
381
382	if (intreg & MEMSTICK_INT_CMDNAK)
383	return msb_exit_state_machine(msb, error: -EIO);
384
385	if (!(intreg & MEMSTICK_INT_CED)) {
386	msb->state = MSB_RP_SEND_INT_REQ;
387	goto again;
388	}
389
390	msb->int_polling = false;
391	msb->state = (intreg & MEMSTICK_INT_ERR) ?
392	MSB_RP_SEND_READ_STATUS_REG : MSB_RP_SEND_OOB_READ;
393	goto again;
394
395	case MSB_RP_SEND_READ_STATUS_REG:
396	/* read the status register to understand source of the INT_ERR */
397	if (!msb_read_regs(msb,
398	offsetof(struct ms_register, status),
399	len: sizeof(struct ms_status_register)))
400	return 0;
401
402	msb->state = MSB_RP_RECEIVE_STATUS_REG;
403	return 0;
404
405	case MSB_RP_RECEIVE_STATUS_REG:
406	msb->regs.status = *(struct ms_status_register *)mrq->data;
407	msb->state = MSB_RP_SEND_OOB_READ;
408	fallthrough;
409
410	case MSB_RP_SEND_OOB_READ:
411	if (!msb_read_regs(msb,
412	offsetof(struct ms_register, extra_data),
413	len: sizeof(struct ms_extra_data_register)))
414	return 0;
415
416	msb->state = MSB_RP_RECEIVE_OOB_READ;
417	return 0;
418
419	case MSB_RP_RECEIVE_OOB_READ:
420	msb->regs.extra_data =
421	*(struct ms_extra_data_register *) mrq->data;
422	msb->state = MSB_RP_SEND_READ_DATA;
423	fallthrough;
424
425	case MSB_RP_SEND_READ_DATA:
426	/* Skip that state if we only read the oob */
427	if (msb->regs.param.cp == MEMSTICK_CP_EXTRA) {
428	msb->state = MSB_RP_RECEIVE_READ_DATA;
429	goto again;
430	}
431
432	sg_init_table(sg, ARRAY_SIZE(sg));
433	msb_sg_copy(sg_from: msb->current_sg, sg_to: sg, ARRAY_SIZE(sg),
434	offset: msb->current_sg_offset,
435	len: msb->page_size);
436
437	memstick_init_req_sg(mrq, tpc: MS_TPC_READ_LONG_DATA, sg);
438	msb->state = MSB_RP_RECEIVE_READ_DATA;
439	return 0;
440
441	case MSB_RP_RECEIVE_READ_DATA:
442	if (!(msb->regs.status.interrupt & MEMSTICK_INT_ERR)) {
443	msb->current_sg_offset += msb->page_size;
444	return msb_exit_state_machine(msb, error: 0);
445	}
446
447	if (msb->regs.status.status1 & MEMSTICK_UNCORR_ERROR) {
448	dbg("read_page: uncorrectable error");
449	return msb_exit_state_machine(msb, error: -EBADMSG);
450	}
451
452	if (msb->regs.status.status1 & MEMSTICK_CORR_ERROR) {
453	dbg("read_page: correctable error");
454	msb->current_sg_offset += msb->page_size;
455	return msb_exit_state_machine(msb, error: -EUCLEAN);
456	} else {
457	dbg("read_page: INT error, but no status error bits");
458	return msb_exit_state_machine(msb, error: -EIO);
459	}
460	}
461
462	BUG();
463	}
464
465	/*
466	* Handler of writes of exactly one block.
467	* Takes address from msb->regs.param.
468	* Writes same extra data to blocks, also taken
469	* from msb->regs.extra
470	* Returns -EBADMSG if write fails due to uncorrectable error, or -EIO if
471	* device refuses to take the command or something else
472	*/
473	static int h_msb_write_block(struct memstick_dev *card,
474	struct memstick_request **out_mrq)
475	{
476	struct msb_data *msb = memstick_get_drvdata(card);
477	struct memstick_request *mrq = *out_mrq = &card->current_mrq;
478	struct scatterlist sg[2];
479	u8 intreg, command;
480
481	if (mrq->error)
482	return msb_exit_state_machine(msb, error: mrq->error);
483
484	again:
485	switch (msb->state) {
486
487	/* HACK: Jmicon handling of TPCs between 8 and
488	* sizeof(memstick_request.data) is broken due to hardware
489	* bug in PIO mode that is used for these TPCs
490	* Therefore split the write
491	*/
492
493	case MSB_WB_SEND_WRITE_PARAMS:
494	if (!msb_write_regs(msb,
495	offsetof(struct ms_register, param),
496	len: sizeof(struct ms_param_register),
497	buf: &msb->regs.param))
498	return 0;
499
500	msb->state = MSB_WB_SEND_WRITE_OOB;
501	return 0;
502
503	case MSB_WB_SEND_WRITE_OOB:
504	if (!msb_write_regs(msb,
505	offsetof(struct ms_register, extra_data),
506	len: sizeof(struct ms_extra_data_register),
507	buf: &msb->regs.extra_data))
508	return 0;
509	msb->state = MSB_WB_SEND_WRITE_COMMAND;
510	return 0;
511
512
513	case MSB_WB_SEND_WRITE_COMMAND:
514	command = MS_CMD_BLOCK_WRITE;
515	memstick_init_req(mrq, tpc: MS_TPC_SET_CMD, buf: &command, length: 1);
516	msb->state = MSB_WB_SEND_INT_REQ;
517	return 0;
518
519	case MSB_WB_SEND_INT_REQ:
520	msb->state = MSB_WB_RECEIVE_INT_REQ;
521	if (msb_read_int_reg(msb, timeout: -1))
522	return 0;
523	fallthrough;
524
525	case MSB_WB_RECEIVE_INT_REQ:
526	intreg = mrq->data[0];
527	msb->regs.status.interrupt = intreg;
528
529	/* errors mean out of here, and fast... */
530	if (intreg & (MEMSTICK_INT_CMDNAK))
531	return msb_exit_state_machine(msb, error: -EIO);
532
533	if (intreg & MEMSTICK_INT_ERR)
534	return msb_exit_state_machine(msb, error: -EBADMSG);
535
536
537	/* for last page we need to poll CED */
538	if (msb->current_page == msb->pages_in_block) {
539	if (intreg & MEMSTICK_INT_CED)
540	return msb_exit_state_machine(msb, error: 0);
541	msb->state = MSB_WB_SEND_INT_REQ;
542	goto again;
543
544	}
545
546	/* for non-last page we need BREQ before writing next chunk */
547	if (!(intreg & MEMSTICK_INT_BREQ)) {
548	msb->state = MSB_WB_SEND_INT_REQ;
549	goto again;
550	}
551
552	msb->int_polling = false;
553	msb->state = MSB_WB_SEND_WRITE_DATA;
554	fallthrough;
555
556	case MSB_WB_SEND_WRITE_DATA:
557	sg_init_table(sg, ARRAY_SIZE(sg));
558
559	if (msb_sg_copy(sg_from: msb->current_sg, sg_to: sg, ARRAY_SIZE(sg),
560	offset: msb->current_sg_offset,
561	len: msb->page_size) < msb->page_size)
562	return msb_exit_state_machine(msb, error: -EIO);
563
564	memstick_init_req_sg(mrq, tpc: MS_TPC_WRITE_LONG_DATA, sg);
565	mrq->need_card_int = 1;
566	msb->state = MSB_WB_RECEIVE_WRITE_CONFIRMATION;
567	return 0;
568
569	case MSB_WB_RECEIVE_WRITE_CONFIRMATION:
570	msb->current_page++;
571	msb->current_sg_offset += msb->page_size;
572	msb->state = MSB_WB_SEND_INT_REQ;
573	goto again;
574	default:
575	BUG();
576	}
577
578	return 0;
579	}
580
581	/*
582	* This function is used to send simple IO requests to device that consist
583	* of register write + command
584	*/
585	static int h_msb_send_command(struct memstick_dev *card,
586	struct memstick_request **out_mrq)
587	{
588	struct msb_data *msb = memstick_get_drvdata(card);
589	struct memstick_request *mrq = *out_mrq = &card->current_mrq;
590	u8 intreg;
591
592	if (mrq->error) {
593	dbg("send_command: unknown error");
594	return msb_exit_state_machine(msb, error: mrq->error);
595	}
596	again:
597	switch (msb->state) {
598
599	/* HACK: see h_msb_write_block */
600	case MSB_SC_SEND_WRITE_PARAMS: /* write param register*/
601	if (!msb_write_regs(msb,
602	offsetof(struct ms_register, param),
603	len: sizeof(struct ms_param_register),
604	buf: &msb->regs.param))
605	return 0;
606	msb->state = MSB_SC_SEND_WRITE_OOB;
607	return 0;
608
609	case MSB_SC_SEND_WRITE_OOB:
610	if (!msb->command_need_oob) {
611	msb->state = MSB_SC_SEND_COMMAND;
612	goto again;
613	}
614
615	if (!msb_write_regs(msb,
616	offsetof(struct ms_register, extra_data),
617	len: sizeof(struct ms_extra_data_register),
618	buf: &msb->regs.extra_data))
619	return 0;
620
621	msb->state = MSB_SC_SEND_COMMAND;
622	return 0;
623
624	case MSB_SC_SEND_COMMAND:
625	memstick_init_req(mrq, tpc: MS_TPC_SET_CMD, buf: &msb->command_value, length: 1);
626	msb->state = MSB_SC_SEND_INT_REQ;
627	return 0;
628
629	case MSB_SC_SEND_INT_REQ:
630	msb->state = MSB_SC_RECEIVE_INT_REQ;
631	if (msb_read_int_reg(msb, timeout: -1))
632	return 0;
633	fallthrough;
634
635	case MSB_SC_RECEIVE_INT_REQ:
636	intreg = mrq->data[0];
637
638	if (intreg & MEMSTICK_INT_CMDNAK)
639	return msb_exit_state_machine(msb, error: -EIO);
640	if (intreg & MEMSTICK_INT_ERR)
641	return msb_exit_state_machine(msb, error: -EBADMSG);
642
643	if (!(intreg & MEMSTICK_INT_CED)) {
644	msb->state = MSB_SC_SEND_INT_REQ;
645	goto again;
646	}
647
648	return msb_exit_state_machine(msb, error: 0);
649	}
650
651	BUG();
652	}
653
654	/* Small handler for card reset */
655	static int h_msb_reset(struct memstick_dev *card,
656	struct memstick_request **out_mrq)
657	{
658	u8 command = MS_CMD_RESET;
659	struct msb_data *msb = memstick_get_drvdata(card);
660	struct memstick_request *mrq = *out_mrq = &card->current_mrq;
661
662	if (mrq->error)
663	return msb_exit_state_machine(msb, error: mrq->error);
664
665	switch (msb->state) {
666	case MSB_RS_SEND:
667	memstick_init_req(mrq, tpc: MS_TPC_SET_CMD, buf: &command, length: 1);
668	mrq->need_card_int = 0;
669	msb->state = MSB_RS_CONFIRM;
670	return 0;
671	case MSB_RS_CONFIRM:
672	return msb_exit_state_machine(msb, error: 0);
673	}
674	BUG();
675	}
676
677	/* This handler is used to do serial->parallel switch */
678	static int h_msb_parallel_switch(struct memstick_dev *card,
679	struct memstick_request **out_mrq)
680	{
681	struct msb_data *msb = memstick_get_drvdata(card);
682	struct memstick_request *mrq = *out_mrq = &card->current_mrq;
683	struct memstick_host *host = card->host;
684
685	if (mrq->error) {
686	dbg("parallel_switch: error");
687	msb->regs.param.system &= ~MEMSTICK_SYS_PAM;
688	return msb_exit_state_machine(msb, error: mrq->error);
689	}
690
691	switch (msb->state) {
692	case MSB_PS_SEND_SWITCH_COMMAND:
693	/* Set the parallel interface on memstick side */
694	msb->regs.param.system |= MEMSTICK_SYS_PAM;
695
696	if (!msb_write_regs(msb,
697	offsetof(struct ms_register, param),
698	len: 1,
699	buf: (unsigned char *)&msb->regs.param))
700	return 0;
701
702	msb->state = MSB_PS_SWICH_HOST;
703	return 0;
704
705	case MSB_PS_SWICH_HOST:
706	/* Set parallel interface on our side + send a dummy request
707	* to see if card responds
708	*/
709	host->set_param(host, MEMSTICK_INTERFACE, MEMSTICK_PAR4);
710	memstick_init_req(mrq, tpc: MS_TPC_GET_INT, NULL, length: 1);
711	msb->state = MSB_PS_CONFIRM;
712	return 0;
713
714	case MSB_PS_CONFIRM:
715	return msb_exit_state_machine(msb, error: 0);
716	}
717
718	BUG();
719	}
720
721	static int msb_switch_to_parallel(struct msb_data *msb);
722
723	/* Reset the card, to guard against hw errors beeing treated as bad blocks */
724	static int msb_reset(struct msb_data *msb, bool full)
725	{
726
727	bool was_parallel = msb->regs.param.system & MEMSTICK_SYS_PAM;
728	struct memstick_dev *card = msb->card;
729	struct memstick_host *host = card->host;
730	int error;
731
732	/* Reset the card */
733	msb->regs.param.system = MEMSTICK_SYS_BAMD;
734
735	if (full) {
736	error = host->set_param(host,
737	MEMSTICK_POWER, MEMSTICK_POWER_OFF);
738	if (error)
739	goto out_error;
740
741	msb_invalidate_reg_window(msb);
742
743	error = host->set_param(host,
744	MEMSTICK_POWER, MEMSTICK_POWER_ON);
745	if (error)
746	goto out_error;
747
748	error = host->set_param(host,
749	MEMSTICK_INTERFACE, MEMSTICK_SERIAL);
750	if (error) {
751	out_error:
752	dbg("Failed to reset the host controller");
753	msb->read_only = true;
754	return -EFAULT;
755	}
756	}
757
758	error = msb_run_state_machine(msb, state_func: h_msb_reset);
759	if (error) {
760	dbg("Failed to reset the card");
761	msb->read_only = true;
762	return -ENODEV;
763	}
764
765	/* Set parallel mode */
766	if (was_parallel)
767	msb_switch_to_parallel(msb);
768	return 0;
769	}
770
771	/* Attempts to switch interface to parallel mode */
772	static int msb_switch_to_parallel(struct msb_data *msb)
773	{
774	int error;
775
776	error = msb_run_state_machine(msb, state_func: h_msb_parallel_switch);
777	if (error) {
778	pr_err("Switch to parallel failed");
779	msb->regs.param.system &= ~MEMSTICK_SYS_PAM;
780	msb_reset(msb, full: true);
781	return -EFAULT;
782	}
783
784	msb->caps |= MEMSTICK_CAP_AUTO_GET_INT;
785	return 0;
786	}
787
788	/* Changes overwrite flag on a page */
789	static int msb_set_overwrite_flag(struct msb_data *msb,
790	u16 pba, u8 page, u8 flag)
791	{
792	if (msb->read_only)
793	return -EROFS;
794
795	msb->regs.param.block_address = cpu_to_be16(pba);
796	msb->regs.param.page_address = page;
797	msb->regs.param.cp = MEMSTICK_CP_OVERWRITE;
798	msb->regs.extra_data.overwrite_flag = flag;
799	msb->command_value = MS_CMD_BLOCK_WRITE;
800	msb->command_need_oob = true;
801
802	dbg_verbose("changing overwrite flag to %02x for sector %d, page %d",
803	flag, pba, page);
804	return msb_run_state_machine(msb, state_func: h_msb_send_command);
805	}
806
807	static int msb_mark_bad(struct msb_data *msb, int pba)
808	{
809	pr_notice("marking pba %d as bad", pba);
810	msb_reset(msb, full: true);
811	return msb_set_overwrite_flag(
812	msb, pba, page: 0, flag: 0xFF & ~MEMSTICK_OVERWRITE_BKST);
813	}
814
815	static int msb_mark_page_bad(struct msb_data *msb, int pba, int page)
816	{
817	dbg("marking page %d of pba %d as bad", page, pba);
818	msb_reset(msb, full: true);
819	return msb_set_overwrite_flag(msb,
820	pba, page, flag: ~MEMSTICK_OVERWRITE_PGST0);
821	}
822
823	/* Erases one physical block */
824	static int msb_erase_block(struct msb_data *msb, u16 pba)
825	{
826	int error, try;
827
828	if (msb->read_only)
829	return -EROFS;
830
831	dbg_verbose("erasing pba %d", pba);
832
833	for (try = 1; try < 3; try++) {
834	msb->regs.param.block_address = cpu_to_be16(pba);
835	msb->regs.param.page_address = 0;
836	msb->regs.param.cp = MEMSTICK_CP_BLOCK;
837	msb->command_value = MS_CMD_BLOCK_ERASE;
838	msb->command_need_oob = false;
839
840
841	error = msb_run_state_machine(msb, state_func: h_msb_send_command);
842	if (!error || msb_reset(msb, full: true))
843	break;
844	}
845
846	if (error) {
847	pr_err("erase failed, marking pba %d as bad", pba);
848	msb_mark_bad(msb, pba);
849	}
850
851	dbg_verbose("erase success, marking pba %d as unused", pba);
852	msb_mark_block_unused(msb, pba);
853	__set_bit(pba, msb->erased_blocks_bitmap);
854	return error;
855	}
856
857	/* Reads one page from device */
858	static int msb_read_page(struct msb_data *msb,
859	u16 pba, u8 page, struct ms_extra_data_register *extra,
860	struct scatterlist *sg, int offset)
861	{
862	int try, error;
863
864	if (pba == MS_BLOCK_INVALID) {
865	unsigned long flags;
866	struct sg_mapping_iter miter;
867	size_t len = msb->page_size;
868
869	dbg_verbose("read unmapped sector. returning 0xFF");
870
871	local_irq_save(flags);
872	sg_miter_start(miter: &miter, sgl: sg, nents: sg_nents(sg),
873	SG_MITER_ATOMIC | SG_MITER_TO_SG);
874
875	while (sg_miter_next(miter: &miter) && len > 0) {
876
877	int chunklen;
878
879	if (offset && offset >= miter.length) {
880	offset -= miter.length;
881	continue;
882	}
883
884	chunklen = min(miter.length - offset, len);
885	memset(miter.addr + offset, 0xFF, chunklen);
886	len -= chunklen;
887	offset = 0;
888	}
889
890	sg_miter_stop(miter: &miter);
891	local_irq_restore(flags);
892
893	if (offset)
894	return -EFAULT;
895
896	if (extra)
897	memset(extra, 0xFF, sizeof(*extra));
898	return 0;
899	}
900
901	if (pba >= msb->block_count) {
902	pr_err("BUG: attempt to read beyond the end of the card at pba %d", pba);
903	return -EINVAL;
904	}
905
906	for (try = 1; try < 3; try++) {
907	msb->regs.param.block_address = cpu_to_be16(pba);
908	msb->regs.param.page_address = page;
909	msb->regs.param.cp = MEMSTICK_CP_PAGE;
910
911	msb->current_sg = sg;
912	msb->current_sg_offset = offset;
913	error = msb_run_state_machine(msb, state_func: h_msb_read_page);
914
915
916	if (error == -EUCLEAN) {
917	pr_notice("correctable error on pba %d, page %d",
918	pba, page);
919	error = 0;
920	}
921
922	if (!error && extra)
923	*extra = msb->regs.extra_data;
924
925	if (!error || msb_reset(msb, full: true))
926	break;
927
928	}
929
930	/* Mark bad pages */
931	if (error == -EBADMSG) {
932	pr_err("uncorrectable error on read of pba %d, page %d",
933	pba, page);
934
935	if (msb->regs.extra_data.overwrite_flag &
936	MEMSTICK_OVERWRITE_PGST0)
937	msb_mark_page_bad(msb, pba, page);
938	return -EBADMSG;
939	}
940
941	if (error)
942	pr_err("read of pba %d, page %d failed with error %d",
943	pba, page, error);
944	return error;
945	}
946
947	/* Reads oob of page only */
948	static int msb_read_oob(struct msb_data *msb, u16 pba, u16 page,
949	struct ms_extra_data_register *extra)
950	{
951	int error;
952
953	BUG_ON(!extra);
954	msb->regs.param.block_address = cpu_to_be16(pba);
955	msb->regs.param.page_address = page;
956	msb->regs.param.cp = MEMSTICK_CP_EXTRA;
957
958	if (pba > msb->block_count) {
959	pr_err("BUG: attempt to read beyond the end of card at pba %d", pba);
960	return -EINVAL;
961	}
962
963	error = msb_run_state_machine(msb, state_func: h_msb_read_page);
964	*extra = msb->regs.extra_data;
965
966	if (error == -EUCLEAN) {
967	pr_notice("correctable error on pba %d, page %d",
968	pba, page);
969	return 0;
970	}
971
972	return error;
973	}
974
975	/* Reads a block and compares it with data contained in scatterlist orig_sg */
976	static int msb_verify_block(struct msb_data *msb, u16 pba,
977	struct scatterlist *orig_sg, int offset)
978	{
979	struct scatterlist sg;
980	int page = 0, error;
981
982	sg_init_one(&sg, msb->block_buffer, msb->block_size);
983
984	while (page < msb->pages_in_block) {
985
986	error = msb_read_page(msb, pba, page,
987	NULL, sg: &sg, offset: page * msb->page_size);
988	if (error)
989	return error;
990	page++;
991	}
992
993	if (msb_sg_compare_to_buffer(sg: orig_sg, offset,
994	buffer: msb->block_buffer, len: msb->block_size))
995	return -EIO;
996	return 0;
997	}
998
999	/* Writes exectly one block + oob */
1000	static int msb_write_block(struct msb_data *msb,
1001	u16 pba, u32 lba, struct scatterlist *sg, int offset)
1002	{
1003	int error, current_try = 1;
1004
1005	BUG_ON(sg->length < msb->page_size);
1006
1007	if (msb->read_only)
1008	return -EROFS;
1009
1010	if (pba == MS_BLOCK_INVALID) {
1011	pr_err(
1012	"BUG: write: attempt to write MS_BLOCK_INVALID block");
1013	return -EINVAL;
1014	}
1015
1016	if (pba >= msb->block_count || lba >= msb->logical_block_count) {
1017	pr_err(
1018	"BUG: write: attempt to write beyond the end of device");
1019	return -EINVAL;
1020	}
1021
1022	if (msb_get_zone_from_lba(lba) != msb_get_zone_from_pba(pba)) {
1023	pr_err("BUG: write: lba zone mismatch");
1024	return -EINVAL;
1025	}
1026
1027	if (pba == msb->boot_block_locations[0] ||
1028	pba == msb->boot_block_locations[1]) {
1029	pr_err("BUG: write: attempt to write to boot blocks!");
1030	return -EINVAL;
1031	}
1032
1033	while (1) {
1034
1035	if (msb->read_only)
1036	return -EROFS;
1037
1038	msb->regs.param.cp = MEMSTICK_CP_BLOCK;
1039	msb->regs.param.page_address = 0;
1040	msb->regs.param.block_address = cpu_to_be16(pba);
1041
1042	msb->regs.extra_data.management_flag = 0xFF;
1043	msb->regs.extra_data.overwrite_flag = 0xF8;
1044	msb->regs.extra_data.logical_address = cpu_to_be16(lba);
1045
1046	msb->current_sg = sg;
1047	msb->current_sg_offset = offset;
1048	msb->current_page = 0;
1049
1050	error = msb_run_state_machine(msb, state_func: h_msb_write_block);
1051
1052	/* Sector we just wrote to is assumed erased since its pba
1053	* was erased. If it wasn't erased, write will succeed
1054	* and will just clear the bits that were set in the block
1055	* thus test that what we have written,
1056	* matches what we expect.
1057	* We do trust the blocks that we erased
1058	*/
1059	if (!error && (verify_writes ||
1060	!test_bit(pba, msb->erased_blocks_bitmap)))
1061	error = msb_verify_block(msb, pba, orig_sg: sg, offset);
1062
1063	if (!error)
1064	break;
1065
1066	if (current_try > 1 || msb_reset(msb, full: true))
1067	break;
1068
1069	pr_err("write failed, trying to erase the pba %d", pba);
1070	error = msb_erase_block(msb, pba);
1071	if (error)
1072	break;
1073
1074	current_try++;
1075	}
1076	return error;
1077	}
1078
1079	/* Finds a free block for write replacement */
1080	static u16 msb_get_free_block(struct msb_data *msb, int zone)
1081	{
1082	u16 pos;
1083	int pba = zone * MS_BLOCKS_IN_ZONE;
1084	int i;
1085
1086	get_random_bytes(buf: &pos, len: sizeof(pos));
1087
1088	if (!msb->free_block_count[zone]) {
1089	pr_err("NO free blocks in the zone %d, to use for a write, (media is WORN out) switching to RO mode", zone);
1090	msb->read_only = true;
1091	return MS_BLOCK_INVALID;
1092	}
1093
1094	pos %= msb->free_block_count[zone];
1095
1096	dbg_verbose("have %d choices for a free block, selected randomly: %d",
1097	msb->free_block_count[zone], pos);
1098
1099	pba = find_next_zero_bit(addr: msb->used_blocks_bitmap,
1100	size: msb->block_count, offset: pba);
1101	for (i = 0; i < pos; ++i)
1102	pba = find_next_zero_bit(addr: msb->used_blocks_bitmap,
1103	size: msb->block_count, offset: pba + 1);
1104
1105	dbg_verbose("result of the free blocks scan: pba %d", pba);
1106
1107	if (pba == msb->block_count || (msb_get_zone_from_pba(pba)) != zone) {
1108	pr_err("BUG: can't get a free block");
1109	msb->read_only = true;
1110	return MS_BLOCK_INVALID;
1111	}
1112
1113	msb_mark_block_used(msb, pba);
1114	return pba;
1115	}
1116
1117	static int msb_update_block(struct msb_data *msb, u16 lba,
1118	struct scatterlist *sg, int offset)
1119	{
1120	u16 pba, new_pba;
1121	int error, try;
1122
1123	pba = msb->lba_to_pba_table[lba];
1124	dbg_verbose("start of a block update at lba %d, pba %d", lba, pba);
1125
1126	if (pba != MS_BLOCK_INVALID) {
1127	dbg_verbose("setting the update flag on the block");
1128	msb_set_overwrite_flag(msb, pba, page: 0,
1129	flag: 0xFF & ~MEMSTICK_OVERWRITE_UDST);
1130	}
1131
1132	for (try = 0; try < 3; try++) {
1133	new_pba = msb_get_free_block(msb,
1134	zone: msb_get_zone_from_lba(lba));
1135
1136	if (new_pba == MS_BLOCK_INVALID) {
1137	error = -EIO;
1138	goto out;
1139	}
1140
1141	dbg_verbose("block update: writing updated block to the pba %d",
1142	new_pba);
1143	error = msb_write_block(msb, pba: new_pba, lba, sg, offset);
1144	if (error == -EBADMSG) {
1145	msb_mark_bad(msb, pba: new_pba);
1146	continue;
1147	}
1148
1149	if (error)
1150	goto out;
1151
1152	dbg_verbose("block update: erasing the old block");
1153	msb_erase_block(msb, pba);
1154	msb->lba_to_pba_table[lba] = new_pba;
1155	return 0;
1156	}
1157	out:
1158	if (error) {
1159	pr_err("block update error after %d tries, switching to r/o mode", try);
1160	msb->read_only = true;
1161	}
1162	return error;
1163	}
1164
1165	/* Converts endiannes in the boot block for easy use */
1166	static void msb_fix_boot_page_endianness(struct ms_boot_page *p)
1167	{
1168	p->header.block_id = be16_to_cpu(p->header.block_id);
1169	p->header.format_reserved = be16_to_cpu(p->header.format_reserved);
1170	p->entry.disabled_block.start_addr
1171	= be32_to_cpu(p->entry.disabled_block.start_addr);
1172	p->entry.disabled_block.data_size
1173	= be32_to_cpu(p->entry.disabled_block.data_size);
1174	p->entry.cis_idi.start_addr
1175	= be32_to_cpu(p->entry.cis_idi.start_addr);
1176	p->entry.cis_idi.data_size
1177	= be32_to_cpu(p->entry.cis_idi.data_size);
1178	p->attr.block_size = be16_to_cpu(p->attr.block_size);
1179	p->attr.number_of_blocks = be16_to_cpu(p->attr.number_of_blocks);
1180	p->attr.number_of_effective_blocks
1181	= be16_to_cpu(p->attr.number_of_effective_blocks);
1182	p->attr.page_size = be16_to_cpu(p->attr.page_size);
1183	p->attr.memory_manufacturer_code
1184	= be16_to_cpu(p->attr.memory_manufacturer_code);
1185	p->attr.memory_device_code = be16_to_cpu(p->attr.memory_device_code);
1186	p->attr.implemented_capacity
1187	= be16_to_cpu(p->attr.implemented_capacity);
1188	p->attr.controller_number = be16_to_cpu(p->attr.controller_number);
1189	p->attr.controller_function = be16_to_cpu(p->attr.controller_function);
1190	}
1191
1192	static int msb_read_boot_blocks(struct msb_data *msb)
1193	{
1194	int pba = 0;
1195	struct scatterlist sg;
1196	struct ms_extra_data_register extra;
1197	struct ms_boot_page *page;
1198
1199	msb->boot_block_locations[0] = MS_BLOCK_INVALID;
1200	msb->boot_block_locations[1] = MS_BLOCK_INVALID;
1201	msb->boot_block_count = 0;
1202
1203	dbg_verbose("Start of a scan for the boot blocks");
1204
1205	if (!msb->boot_page) {
1206	page = kmalloc_array(n: 2, size: sizeof(struct ms_boot_page),
1207	GFP_KERNEL);
1208	if (!page)
1209	return -ENOMEM;
1210
1211	msb->boot_page = page;
1212	} else
1213	page = msb->boot_page;
1214
1215	msb->block_count = MS_BLOCK_MAX_BOOT_ADDR;
1216
1217	for (pba = 0; pba < MS_BLOCK_MAX_BOOT_ADDR; pba++) {
1218
1219	sg_init_one(&sg, page, sizeof(*page));
1220	if (msb_read_page(msb, pba, page: 0, extra: &extra, sg: &sg, offset: 0)) {
1221	dbg("boot scan: can't read pba %d", pba);
1222	continue;
1223	}
1224
1225	if (extra.management_flag & MEMSTICK_MANAGEMENT_SYSFLG) {
1226	dbg("management flag doesn't indicate boot block %d",
1227	pba);
1228	continue;
1229	}
1230
1231	if (be16_to_cpu(page->header.block_id) != MS_BLOCK_BOOT_ID) {
1232	dbg("the pba at %d doesn't contain boot block ID", pba);
1233	continue;
1234	}
1235
1236	msb_fix_boot_page_endianness(p: page);
1237	msb->boot_block_locations[msb->boot_block_count] = pba;
1238
1239	page++;
1240	msb->boot_block_count++;
1241
1242	if (msb->boot_block_count == 2)
1243	break;
1244	}
1245
1246	if (!msb->boot_block_count) {
1247	pr_err("media doesn't contain master page, aborting");
1248	return -EIO;
1249	}
1250
1251	dbg_verbose("End of scan for boot blocks");
1252	return 0;
1253	}
1254
1255	static int msb_read_bad_block_table(struct msb_data *msb, int block_nr)
1256	{
1257	struct ms_boot_page *boot_block;
1258	struct scatterlist sg;
1259	u16 *buffer = NULL;
1260	int offset = 0;
1261	int i, error = 0;
1262	int data_size, data_offset, page, page_offset, size_to_read;
1263	u16 pba;
1264
1265	BUG_ON(block_nr > 1);
1266	boot_block = &msb->boot_page[block_nr];
1267	pba = msb->boot_block_locations[block_nr];
1268
1269	if (msb->boot_block_locations[block_nr] == MS_BLOCK_INVALID)
1270	return -EINVAL;
1271
1272	data_size = boot_block->entry.disabled_block.data_size;
1273	data_offset = sizeof(struct ms_boot_page) +
1274	boot_block->entry.disabled_block.start_addr;
1275	if (!data_size)
1276	return 0;
1277
1278	page = data_offset / msb->page_size;
1279	page_offset = data_offset % msb->page_size;
1280	size_to_read =
1281	DIV_ROUND_UP(data_size + page_offset, msb->page_size) *
1282	msb->page_size;
1283
1284	dbg("reading bad block of boot block at pba %d, offset %d len %d",
1285	pba, data_offset, data_size);
1286
1287	buffer = kzalloc(size: size_to_read, GFP_KERNEL);
1288	if (!buffer)
1289	return -ENOMEM;
1290
1291	/* Read the buffer */
1292	sg_init_one(&sg, buffer, size_to_read);
1293
1294	while (offset < size_to_read) {
1295	error = msb_read_page(msb, pba, page, NULL, sg: &sg, offset);
1296	if (error)
1297	goto out;
1298
1299	page++;
1300	offset += msb->page_size;
1301
1302	if (page == msb->pages_in_block) {
1303	pr_err(
1304	"bad block table extends beyond the boot block");
1305	break;
1306	}
1307	}
1308
1309	/* Process the bad block table */
1310	for (i = page_offset; i < data_size / sizeof(u16); i++) {
1311
1312	u16 bad_block = be16_to_cpu(buffer[i]);
1313
1314	if (bad_block >= msb->block_count) {
1315	dbg("bad block table contains invalid block %d",
1316	bad_block);
1317	continue;
1318	}
1319
1320	if (test_bit(bad_block, msb->used_blocks_bitmap)) {
1321	dbg("duplicate bad block %d in the table",
1322	bad_block);
1323	continue;
1324	}
1325
1326	dbg("block %d is marked as factory bad", bad_block);
1327	msb_mark_block_used(msb, pba: bad_block);
1328	}
1329	out:
1330	kfree(objp: buffer);
1331	return error;
1332	}
1333
1334	static int msb_ftl_initialize(struct msb_data *msb)
1335	{
1336	int i;
1337
1338	if (msb->ftl_initialized)
1339	return 0;
1340
1341	msb->zone_count = msb->block_count / MS_BLOCKS_IN_ZONE;
1342	msb->logical_block_count = msb->zone_count * 496 - 2;
1343
1344	msb->used_blocks_bitmap = bitmap_zalloc(nbits: msb->block_count, GFP_KERNEL);
1345	msb->erased_blocks_bitmap = bitmap_zalloc(nbits: msb->block_count, GFP_KERNEL);
1346	msb->lba_to_pba_table =
1347	kmalloc_array(n: msb->logical_block_count, size: sizeof(u16),
1348	GFP_KERNEL);
1349
1350	if (!msb->used_blocks_bitmap || !msb->lba_to_pba_table ||
1351	!msb->erased_blocks_bitmap) {
1352	bitmap_free(bitmap: msb->used_blocks_bitmap);
1353	bitmap_free(bitmap: msb->erased_blocks_bitmap);
1354	kfree(objp: msb->lba_to_pba_table);
1355	return -ENOMEM;
1356	}
1357
1358	for (i = 0; i < msb->zone_count; i++)
1359	msb->free_block_count[i] = MS_BLOCKS_IN_ZONE;
1360
1361	memset(msb->lba_to_pba_table, MS_BLOCK_INVALID,
1362	msb->logical_block_count * sizeof(u16));
1363
1364	dbg("initial FTL tables created. Zone count = %d, Logical block count = %d",
1365	msb->zone_count, msb->logical_block_count);
1366
1367	msb->ftl_initialized = true;
1368	return 0;
1369	}
1370
1371	static int msb_ftl_scan(struct msb_data *msb)
1372	{
1373	u16 pba, lba, other_block;
1374	u8 overwrite_flag, management_flag, other_overwrite_flag;
1375	int error;
1376	struct ms_extra_data_register extra;
1377	u8 *overwrite_flags = kzalloc(size: msb->block_count, GFP_KERNEL);
1378
1379	if (!overwrite_flags)
1380	return -ENOMEM;
1381
1382	dbg("Start of media scanning");
1383	for (pba = 0; pba < msb->block_count; pba++) {
1384
1385	if (pba == msb->boot_block_locations[0] ||
1386	pba == msb->boot_block_locations[1]) {
1387	dbg_verbose("pba %05d -> [boot block]", pba);
1388	msb_mark_block_used(msb, pba);
1389	continue;
1390	}
1391
1392	if (test_bit(pba, msb->used_blocks_bitmap)) {
1393	dbg_verbose("pba %05d -> [factory bad]", pba);
1394	continue;
1395	}
1396
1397	memset(&extra, 0, sizeof(extra));
1398	error = msb_read_oob(msb, pba, page: 0, extra: &extra);
1399
1400	/* can't trust the page if we can't read the oob */
1401	if (error == -EBADMSG) {
1402	pr_notice(
1403	"oob of pba %d damaged, will try to erase it", pba);
1404	msb_mark_block_used(msb, pba);
1405	msb_erase_block(msb, pba);
1406	continue;
1407	} else if (error) {
1408	pr_err("unknown error %d on read of oob of pba %d - aborting",
1409	error, pba);
1410
1411	kfree(objp: overwrite_flags);
1412	return error;
1413	}
1414
1415	lba = be16_to_cpu(extra.logical_address);
1416	management_flag = extra.management_flag;
1417	overwrite_flag = extra.overwrite_flag;
1418	overwrite_flags[pba] = overwrite_flag;
1419
1420	/* Skip bad blocks */
1421	if (!(overwrite_flag & MEMSTICK_OVERWRITE_BKST)) {
1422	dbg("pba %05d -> [BAD]", pba);
1423	msb_mark_block_used(msb, pba);
1424	continue;
1425	}
1426
1427	/* Skip system/drm blocks */
1428	if ((management_flag & MEMSTICK_MANAGEMENT_FLAG_NORMAL) !=
1429	MEMSTICK_MANAGEMENT_FLAG_NORMAL) {
1430	dbg("pba %05d -> [reserved management flag %02x]",
1431	pba, management_flag);
1432	msb_mark_block_used(msb, pba);
1433	continue;
1434	}
1435
1436	/* Erase temporary tables */
1437	if (!(management_flag & MEMSTICK_MANAGEMENT_ATFLG)) {
1438	dbg("pba %05d -> [temp table] - will erase", pba);
1439
1440	msb_mark_block_used(msb, pba);
1441	msb_erase_block(msb, pba);
1442	continue;
1443	}
1444
1445	if (lba == MS_BLOCK_INVALID) {
1446	dbg_verbose("pba %05d -> [free]", pba);
1447	continue;
1448	}
1449
1450	msb_mark_block_used(msb, pba);
1451
1452	/* Block has LBA not according to zoning*/
1453	if (msb_get_zone_from_lba(lba) != msb_get_zone_from_pba(pba)) {
1454	pr_notice("pba %05d -> [bad lba %05d] - will erase",
1455	pba, lba);
1456	msb_erase_block(msb, pba);
1457	continue;
1458	}
1459
1460	/* No collisions - great */
1461	if (msb->lba_to_pba_table[lba] == MS_BLOCK_INVALID) {
1462	dbg_verbose("pba %05d -> [lba %05d]", pba, lba);
1463	msb->lba_to_pba_table[lba] = pba;
1464	continue;
1465	}
1466
1467	other_block = msb->lba_to_pba_table[lba];
1468	other_overwrite_flag = overwrite_flags[other_block];
1469
1470	pr_notice("Collision between pba %d and pba %d",
1471	pba, other_block);
1472
1473	if (!(overwrite_flag & MEMSTICK_OVERWRITE_UDST)) {
1474	pr_notice("pba %d is marked as stable, use it", pba);
1475	msb_erase_block(msb, pba: other_block);
1476	msb->lba_to_pba_table[lba] = pba;
1477	continue;
1478	}
1479
1480	if (!(other_overwrite_flag & MEMSTICK_OVERWRITE_UDST)) {
1481	pr_notice("pba %d is marked as stable, use it",
1482	other_block);
1483	msb_erase_block(msb, pba);
1484	continue;
1485	}
1486
1487	pr_notice("collision between blocks %d and %d, without stable flag set on both, erasing pba %d",
1488	pba, other_block, other_block);
1489
1490	msb_erase_block(msb, pba: other_block);
1491	msb->lba_to_pba_table[lba] = pba;
1492	}
1493
1494	dbg("End of media scanning");
1495	kfree(objp: overwrite_flags);
1496	return 0;
1497	}
1498
1499	static void msb_cache_flush_timer(struct timer_list *t)
1500	{
1501	struct msb_data *msb = from_timer(msb, t, cache_flush_timer);
1502
1503	msb->need_flush_cache = true;
1504	queue_work(wq: msb->io_queue, work: &msb->io_work);
1505	}
1506
1507
1508	static void msb_cache_discard(struct msb_data *msb)
1509	{
1510	if (msb->cache_block_lba == MS_BLOCK_INVALID)
1511	return;
1512
1513	del_timer_sync(timer: &msb->cache_flush_timer);
1514
1515	dbg_verbose("Discarding the write cache");
1516	msb->cache_block_lba = MS_BLOCK_INVALID;
1517	bitmap_zero(dst: &msb->valid_cache_bitmap, nbits: msb->pages_in_block);
1518	}
1519
1520	static int msb_cache_init(struct msb_data *msb)
1521	{
1522	timer_setup(&msb->cache_flush_timer, msb_cache_flush_timer, 0);
1523
1524	if (!msb->cache)
1525	msb->cache = kzalloc(size: msb->block_size, GFP_KERNEL);
1526	if (!msb->cache)
1527	return -ENOMEM;
1528
1529	msb_cache_discard(msb);
1530	return 0;
1531	}
1532
1533	static int msb_cache_flush(struct msb_data *msb)
1534	{
1535	struct scatterlist sg;
1536	struct ms_extra_data_register extra;
1537	int page, offset, error;
1538	u16 pba, lba;
1539
1540	if (msb->read_only)
1541	return -EROFS;
1542
1543	if (msb->cache_block_lba == MS_BLOCK_INVALID)
1544	return 0;
1545
1546	lba = msb->cache_block_lba;
1547	pba = msb->lba_to_pba_table[lba];
1548
1549	dbg_verbose("Flushing the write cache of pba %d (LBA %d)",
1550	pba, msb->cache_block_lba);
1551
1552	sg_init_one(&sg, msb->cache , msb->block_size);
1553
1554	/* Read all missing pages in cache */
1555	for (page = 0; page < msb->pages_in_block; page++) {
1556
1557	if (test_bit(page, &msb->valid_cache_bitmap))
1558	continue;
1559
1560	offset = page * msb->page_size;
1561
1562	dbg_verbose("reading non-present sector %d of cache block %d",
1563	page, lba);
1564	error = msb_read_page(msb, pba, page, extra: &extra, sg: &sg, offset);
1565
1566	/* Bad pages are copied with 00 page status */
1567	if (error == -EBADMSG) {
1568	pr_err("read error on sector %d, contents probably damaged", page);
1569	continue;
1570	}
1571
1572	if (error)
1573	return error;
1574
1575	if ((extra.overwrite_flag & MEMSTICK_OV_PG_NORMAL) !=
1576	MEMSTICK_OV_PG_NORMAL) {
1577	dbg("page %d is marked as bad", page);
1578	continue;
1579	}
1580
1581	set_bit(nr: page, addr: &msb->valid_cache_bitmap);
1582	}
1583
1584	/* Write the cache now */
1585	error = msb_update_block(msb, lba: msb->cache_block_lba, sg: &sg, offset: 0);
1586	pba = msb->lba_to_pba_table[msb->cache_block_lba];
1587
1588	/* Mark invalid pages */
1589	if (!error) {
1590	for (page = 0; page < msb->pages_in_block; page++) {
1591
1592	if (test_bit(page, &msb->valid_cache_bitmap))
1593	continue;
1594
1595	dbg("marking page %d as containing damaged data",
1596	page);
1597	msb_set_overwrite_flag(msb,
1598	pba , page, flag: 0xFF & ~MEMSTICK_OV_PG_NORMAL);
1599	}
1600	}
1601
1602	msb_cache_discard(msb);
1603	return error;
1604	}
1605
1606	static int msb_cache_write(struct msb_data *msb, int lba,
1607	int page, bool add_to_cache_only, struct scatterlist *sg, int offset)
1608	{
1609	int error;
1610	struct scatterlist sg_tmp[10];
1611
1612	if (msb->read_only)
1613	return -EROFS;
1614
1615	if (msb->cache_block_lba == MS_BLOCK_INVALID ||
1616	lba != msb->cache_block_lba)
1617	if (add_to_cache_only)
1618	return 0;
1619
1620	/* If we need to write different block */
1621	if (msb->cache_block_lba != MS_BLOCK_INVALID &&
1622	lba != msb->cache_block_lba) {
1623	dbg_verbose("first flush the cache");
1624	error = msb_cache_flush(msb);
1625	if (error)
1626	return error;
1627	}
1628
1629	if (msb->cache_block_lba == MS_BLOCK_INVALID) {
1630	msb->cache_block_lba = lba;
1631	mod_timer(timer: &msb->cache_flush_timer,
1632	expires: jiffies + msecs_to_jiffies(m: cache_flush_timeout));
1633	}
1634
1635	dbg_verbose("Write of LBA %d page %d to cache ", lba, page);
1636
1637	sg_init_table(sg_tmp, ARRAY_SIZE(sg_tmp));
1638	msb_sg_copy(sg_from: sg, sg_to: sg_tmp, ARRAY_SIZE(sg_tmp), offset, len: msb->page_size);
1639
1640	sg_copy_to_buffer(sgl: sg_tmp, nents: sg_nents(sg: sg_tmp),
1641	buf: msb->cache + page * msb->page_size, buflen: msb->page_size);
1642
1643	set_bit(nr: page, addr: &msb->valid_cache_bitmap);
1644	return 0;
1645	}
1646
1647	static int msb_cache_read(struct msb_data *msb, int lba,
1648	int page, struct scatterlist *sg, int offset)
1649	{
1650	int pba = msb->lba_to_pba_table[lba];
1651	struct scatterlist sg_tmp[10];
1652	int error = 0;
1653
1654	if (lba == msb->cache_block_lba &&
1655	test_bit(page, &msb->valid_cache_bitmap)) {
1656
1657	dbg_verbose("Read of LBA %d (pba %d) sector %d from cache",
1658	lba, pba, page);
1659
1660	sg_init_table(sg_tmp, ARRAY_SIZE(sg_tmp));
1661	msb_sg_copy(sg_from: sg, sg_to: sg_tmp, ARRAY_SIZE(sg_tmp),
1662	offset, len: msb->page_size);
1663	sg_copy_from_buffer(sgl: sg_tmp, nents: sg_nents(sg: sg_tmp),
1664	buf: msb->cache + msb->page_size * page,
1665	buflen: msb->page_size);
1666	} else {
1667	dbg_verbose("Read of LBA %d (pba %d) sector %d from device",
1668	lba, pba, page);
1669
1670	error = msb_read_page(msb, pba, page, NULL, sg, offset);
1671	if (error)
1672	return error;
1673
1674	msb_cache_write(msb, lba, page, add_to_cache_only: true, sg, offset);
1675	}
1676	return error;
1677	}
1678
1679	/* Emulated geometry table
1680	* This table content isn't that importaint,
1681	* One could put here different values, providing that they still
1682	* cover whole disk.
1683	* 64 MB entry is what windows reports for my 64M memstick
1684	*/
1685
1686	static const struct chs_entry chs_table[] = {
1687	/* size sectors cylynders heads */
1688	{ 4, 16, 247, 2 },
1689	{ 8, 16, 495, 2 },
1690	{ 16, 16, 495, 4 },
1691	{ 32, 16, 991, 4 },
1692	{ 64, 16, 991, 8 },
1693	{128, 16, 991, 16 },
1694	{ 0 }
1695	};
1696
1697	/* Load information about the card */
1698	static int msb_init_card(struct memstick_dev *card)
1699	{
1700	struct msb_data *msb = memstick_get_drvdata(card);
1701	struct memstick_host *host = card->host;
1702	struct ms_boot_page *boot_block;
1703	int error = 0, i, raw_size_in_megs;
1704
1705	msb->caps = 0;
1706
1707	if (card->id.class >= MEMSTICK_CLASS_ROM &&
1708	card->id.class <= MEMSTICK_CLASS_ROM)
1709	msb->read_only = true;
1710
1711	msb->state = -1;
1712	error = msb_reset(msb, full: false);
1713	if (error)
1714	return error;
1715
1716	/* Due to a bug in Jmicron driver written by Alex Dubov,
1717	* its serial mode barely works,
1718	* so we switch to parallel mode right away
1719	*/
1720	if (host->caps & MEMSTICK_CAP_PAR4)
1721	msb_switch_to_parallel(msb);
1722
1723	msb->page_size = sizeof(struct ms_boot_page);
1724
1725	/* Read the boot page */
1726	error = msb_read_boot_blocks(msb);
1727	if (error)
1728	return -EIO;
1729
1730	boot_block = &msb->boot_page[0];
1731
1732	/* Save intersting attributes from boot page */
1733	msb->block_count = boot_block->attr.number_of_blocks;
1734	msb->page_size = boot_block->attr.page_size;
1735
1736	msb->pages_in_block = boot_block->attr.block_size * 2;
1737	msb->block_size = msb->page_size * msb->pages_in_block;
1738
1739	if ((size_t)msb->page_size > PAGE_SIZE) {
1740	/* this isn't supported by linux at all, anyway*/
1741	dbg("device page %d size isn't supported", msb->page_size);
1742	return -EINVAL;
1743	}
1744
1745	msb->block_buffer = kzalloc(size: msb->block_size, GFP_KERNEL);
1746	if (!msb->block_buffer)
1747	return -ENOMEM;
1748
1749	raw_size_in_megs = (msb->block_size * msb->block_count) >> 20;
1750
1751	for (i = 0; chs_table[i].size; i++) {
1752
1753	if (chs_table[i].size != raw_size_in_megs)
1754	continue;
1755
1756	msb->geometry.cylinders = chs_table[i].cyl;
1757	msb->geometry.heads = chs_table[i].head;
1758	msb->geometry.sectors = chs_table[i].sec;
1759	break;
1760	}
1761
1762	if (boot_block->attr.transfer_supporting == 1)
1763	msb->caps |= MEMSTICK_CAP_PAR4;
1764
1765	if (boot_block->attr.device_type & 0x03)
1766	msb->read_only = true;
1767
1768	dbg("Total block count = %d", msb->block_count);
1769	dbg("Each block consists of %d pages", msb->pages_in_block);
1770	dbg("Page size = %d bytes", msb->page_size);
1771	dbg("Parallel mode supported: %d", !!(msb->caps & MEMSTICK_CAP_PAR4));
1772	dbg("Read only: %d", msb->read_only);
1773
1774	#if 0
1775	/* Now we can switch the interface */
1776	if (host->caps & msb->caps & MEMSTICK_CAP_PAR4)
1777	msb_switch_to_parallel(msb);
1778	#endif
1779
1780	error = msb_cache_init(msb);
1781	if (error)
1782	return error;
1783
1784	error = msb_ftl_initialize(msb);
1785	if (error)
1786	return error;
1787
1788
1789	/* Read the bad block table */
1790	error = msb_read_bad_block_table(msb, block_nr: 0);
1791
1792	if (error && error != -ENOMEM) {
1793	dbg("failed to read bad block table from primary boot block, trying from backup");
1794	error = msb_read_bad_block_table(msb, block_nr: 1);
1795	}
1796
1797	if (error)
1798	return error;
1799
1800	/* *drum roll* Scan the media */
1801	error = msb_ftl_scan(msb);
1802	if (error) {
1803	pr_err("Scan of media failed");
1804	return error;
1805	}
1806
1807	return 0;
1808
1809	}
1810
1811	static int msb_do_write_request(struct msb_data *msb, int lba,
1812	int page, struct scatterlist *sg, size_t len, int *sucessfuly_written)
1813	{
1814	int error = 0;
1815	off_t offset = 0;
1816	*sucessfuly_written = 0;
1817
1818	while (offset < len) {
1819	if (page == 0 && len - offset >= msb->block_size) {
1820
1821	if (msb->cache_block_lba == lba)
1822	msb_cache_discard(msb);
1823
1824	dbg_verbose("Writing whole lba %d", lba);
1825	error = msb_update_block(msb, lba, sg, offset);
1826	if (error)
1827	return error;
1828
1829	offset += msb->block_size;
1830	*sucessfuly_written += msb->block_size;
1831	lba++;
1832	continue;
1833	}
1834
1835	error = msb_cache_write(msb, lba, page, add_to_cache_only: false, sg, offset);
1836	if (error)
1837	return error;
1838
1839	offset += msb->page_size;
1840	*sucessfuly_written += msb->page_size;
1841
1842	page++;
1843	if (page == msb->pages_in_block) {
1844	page = 0;
1845	lba++;
1846	}
1847	}
1848	return 0;
1849	}
1850
1851	static int msb_do_read_request(struct msb_data *msb, int lba,
1852	int page, struct scatterlist *sg, int len, int *sucessfuly_read)
1853	{
1854	int error = 0;
1855	int offset = 0;
1856	*sucessfuly_read = 0;
1857
1858	while (offset < len) {
1859
1860	error = msb_cache_read(msb, lba, page, sg, offset);
1861	if (error)
1862	return error;
1863
1864	offset += msb->page_size;
1865	*sucessfuly_read += msb->page_size;
1866
1867	page++;
1868	if (page == msb->pages_in_block) {
1869	page = 0;
1870	lba++;
1871	}
1872	}
1873	return 0;
1874	}
1875
1876	static void msb_io_work(struct work_struct *work)
1877	{
1878	struct msb_data *msb = container_of(work, struct msb_data, io_work);
1879	int page, error, len;
1880	sector_t lba;
1881	struct scatterlist *sg = msb->prealloc_sg;
1882	struct request *req;
1883
1884	dbg_verbose("IO: work started");
1885
1886	while (1) {
1887	spin_lock_irq(lock: &msb->q_lock);
1888
1889	if (msb->need_flush_cache) {
1890	msb->need_flush_cache = false;
1891	spin_unlock_irq(lock: &msb->q_lock);
1892	msb_cache_flush(msb);
1893	continue;
1894	}
1895
1896	req = msb->req;
1897	if (!req) {
1898	dbg_verbose("IO: no more requests exiting");
1899	spin_unlock_irq(lock: &msb->q_lock);
1900	return;
1901	}
1902
1903	spin_unlock_irq(lock: &msb->q_lock);
1904
1905	/* process the request */
1906	dbg_verbose("IO: processing new request");
1907	blk_rq_map_sg(q: msb->queue, rq: req, sglist: sg);
1908
1909	lba = blk_rq_pos(rq: req);
1910
1911	sector_div(lba, msb->page_size / 512);
1912	page = sector_div(lba, msb->pages_in_block);
1913
1914	if (rq_data_dir(msb->req) == READ)
1915	error = msb_do_read_request(msb, lba, page, sg,
1916	len: blk_rq_bytes(rq: req), sucessfuly_read: &len);
1917	else
1918	error = msb_do_write_request(msb, lba, page, sg,
1919	len: blk_rq_bytes(rq: req), sucessfuly_written: &len);
1920
1921	if (len && !blk_update_request(rq: req, BLK_STS_OK, nr_bytes: len)) {
1922	__blk_mq_end_request(rq: req, BLK_STS_OK);
1923	spin_lock_irq(lock: &msb->q_lock);
1924	msb->req = NULL;
1925	spin_unlock_irq(lock: &msb->q_lock);
1926	}
1927
1928	if (error && msb->req) {
1929	blk_status_t ret = errno_to_blk_status(errno: error);
1930
1931	dbg_verbose("IO: ending one sector of the request with error");
1932	blk_mq_end_request(rq: req, error: ret);
1933	spin_lock_irq(lock: &msb->q_lock);
1934	msb->req = NULL;
1935	spin_unlock_irq(lock: &msb->q_lock);
1936	}
1937
1938	if (msb->req)
1939	dbg_verbose("IO: request still pending");
1940	}
1941	}
1942
1943	static DEFINE_IDR(msb_disk_idr); /*set of used disk numbers */
1944	static DEFINE_MUTEX(msb_disk_lock); /* protects against races in open/release */
1945
1946	static void msb_data_clear(struct msb_data *msb)
1947	{
1948	kfree(objp: msb->boot_page);
1949	bitmap_free(bitmap: msb->used_blocks_bitmap);
1950	bitmap_free(bitmap: msb->erased_blocks_bitmap);
1951	kfree(objp: msb->lba_to_pba_table);
1952	kfree(objp: msb->cache);
1953	msb->card = NULL;
1954	}
1955
1956	static int msb_bd_getgeo(struct block_device *bdev,
1957	struct hd_geometry *geo)
1958	{
1959	struct msb_data *msb = bdev->bd_disk->private_data;
1960	*geo = msb->geometry;
1961	return 0;
1962	}
1963
1964	static void msb_bd_free_disk(struct gendisk *disk)
1965	{
1966	struct msb_data *msb = disk->private_data;
1967
1968	mutex_lock(&msb_disk_lock);
1969	idr_remove(&msb_disk_idr, id: msb->disk_id);
1970	mutex_unlock(lock: &msb_disk_lock);
1971
1972	kfree(objp: msb);
1973	}
1974
1975	static blk_status_t msb_queue_rq(struct blk_mq_hw_ctx *hctx,
1976	const struct blk_mq_queue_data *bd)
1977	{
1978	struct memstick_dev *card = hctx->queue->queuedata;
1979	struct msb_data *msb = memstick_get_drvdata(card);
1980	struct request *req = bd->rq;
1981
1982	dbg_verbose("Submit request");
1983
1984	spin_lock_irq(lock: &msb->q_lock);
1985
1986	if (msb->card_dead) {
1987	dbg("Refusing requests on removed card");
1988
1989	WARN_ON(!msb->io_queue_stopped);
1990
1991	spin_unlock_irq(lock: &msb->q_lock);
1992	blk_mq_start_request(rq: req);
1993	return BLK_STS_IOERR;
1994	}
1995
1996	if (msb->req) {
1997	spin_unlock_irq(lock: &msb->q_lock);
1998	return BLK_STS_DEV_RESOURCE;
1999	}
2000
2001	blk_mq_start_request(rq: req);
2002	msb->req = req;
2003
2004	if (!msb->io_queue_stopped)
2005	queue_work(wq: msb->io_queue, work: &msb->io_work);
2006
2007	spin_unlock_irq(lock: &msb->q_lock);
2008	return BLK_STS_OK;
2009	}
2010
2011	static int msb_check_card(struct memstick_dev *card)
2012	{
2013	struct msb_data *msb = memstick_get_drvdata(card);
2014
2015	return (msb->card_dead == 0);
2016	}
2017
2018	static void msb_stop(struct memstick_dev *card)
2019	{
2020	struct msb_data *msb = memstick_get_drvdata(card);
2021	unsigned long flags;
2022
2023	dbg("Stopping all msblock IO");
2024
2025	blk_mq_stop_hw_queues(q: msb->queue);
2026	spin_lock_irqsave(&msb->q_lock, flags);
2027	msb->io_queue_stopped = true;
2028	spin_unlock_irqrestore(lock: &msb->q_lock, flags);
2029
2030	del_timer_sync(timer: &msb->cache_flush_timer);
2031	flush_workqueue(msb->io_queue);
2032
2033	spin_lock_irqsave(&msb->q_lock, flags);
2034	if (msb->req) {
2035	blk_mq_requeue_request(rq: msb->req, kick_requeue_list: false);
2036	msb->req = NULL;
2037	}
2038	spin_unlock_irqrestore(lock: &msb->q_lock, flags);
2039	}
2040
2041	static void msb_start(struct memstick_dev *card)
2042	{
2043	struct msb_data *msb = memstick_get_drvdata(card);
2044	unsigned long flags;
2045
2046	dbg("Resuming IO from msblock");
2047
2048	msb_invalidate_reg_window(msb);
2049
2050	spin_lock_irqsave(&msb->q_lock, flags);
2051	if (!msb->io_queue_stopped || msb->card_dead) {
2052	spin_unlock_irqrestore(lock: &msb->q_lock, flags);
2053	return;
2054	}
2055	spin_unlock_irqrestore(lock: &msb->q_lock, flags);
2056
2057	/* Kick cache flush anyway, its harmless */
2058	msb->need_flush_cache = true;
2059	msb->io_queue_stopped = false;
2060
2061	blk_mq_start_hw_queues(q: msb->queue);
2062
2063	queue_work(wq: msb->io_queue, work: &msb->io_work);
2064
2065	}
2066
2067	static const struct block_device_operations msb_bdops = {
2068	.owner = THIS_MODULE,
2069	.getgeo = msb_bd_getgeo,
2070	.free_disk = msb_bd_free_disk,
2071	};
2072
2073	static const struct blk_mq_ops msb_mq_ops = {
2074	.queue_rq = msb_queue_rq,
2075	};
2076
2077	/* Registers the block device */
2078	static int msb_init_disk(struct memstick_dev *card)
2079	{
2080	struct msb_data *msb = memstick_get_drvdata(card);
2081	struct queue_limits lim = {
2082	.logical_block_size = msb->page_size,
2083	.max_hw_sectors = MS_BLOCK_MAX_PAGES,
2084	.max_segments = MS_BLOCK_MAX_SEGS,
2085	.max_segment_size = MS_BLOCK_MAX_PAGES * msb->page_size,
2086	};
2087	int rc;
2088	unsigned long capacity;
2089
2090	mutex_lock(&msb_disk_lock);
2091	msb->disk_id = idr_alloc(&msb_disk_idr, ptr: card, start: 0, end: 256, GFP_KERNEL);
2092	mutex_unlock(lock: &msb_disk_lock);
2093
2094	if (msb->disk_id < 0)
2095	return msb->disk_id;
2096
2097	rc = blk_mq_alloc_sq_tag_set(set: &msb->tag_set, ops: &msb_mq_ops, queue_depth: 2,
2098	set_flags: BLK_MQ_F_SHOULD_MERGE);
2099	if (rc)
2100	goto out_release_id;
2101
2102	msb->disk = blk_mq_alloc_disk(&msb->tag_set, &lim, card);
2103	if (IS_ERR(ptr: msb->disk)) {
2104	rc = PTR_ERR(ptr: msb->disk);
2105	goto out_free_tag_set;
2106	}
2107	msb->queue = msb->disk->queue;
2108
2109	sprintf(buf: msb->disk->disk_name, fmt: "msblk%d", msb->disk_id);
2110	msb->disk->fops = &msb_bdops;
2111	msb->disk->private_data = msb;
2112
2113	capacity = msb->pages_in_block * msb->logical_block_count;
2114	capacity *= (msb->page_size / 512);
2115	set_capacity(disk: msb->disk, size: capacity);
2116	dbg("Set total disk size to %lu sectors", capacity);
2117
2118	msb->io_queue = alloc_ordered_workqueue("ms_block", WQ_MEM_RECLAIM);
2119	if (!msb->io_queue) {
2120	rc = -ENOMEM;
2121	goto out_cleanup_disk;
2122	}
2123
2124	INIT_WORK(&msb->io_work, msb_io_work);
2125	sg_init_table(msb->prealloc_sg, MS_BLOCK_MAX_SEGS+1);
2126
2127	if (msb->read_only)
2128	set_disk_ro(disk: msb->disk, read_only: 1);
2129
2130	msb_start(card);
2131	rc = device_add_disk(parent: &card->dev, disk: msb->disk, NULL);
2132	if (rc)
2133	goto out_destroy_workqueue;
2134	dbg("Disk added");
2135	return 0;
2136
2137	out_destroy_workqueue:
2138	destroy_workqueue(wq: msb->io_queue);
2139	out_cleanup_disk:
2140	put_disk(disk: msb->disk);
2141	out_free_tag_set:
2142	blk_mq_free_tag_set(set: &msb->tag_set);
2143	out_release_id:
2144	mutex_lock(&msb_disk_lock);
2145	idr_remove(&msb_disk_idr, id: msb->disk_id);
2146	mutex_unlock(lock: &msb_disk_lock);
2147	return rc;
2148	}
2149
2150	static int msb_probe(struct memstick_dev *card)
2151	{
2152	struct msb_data *msb;
2153	int rc = 0;
2154
2155	msb = kzalloc(size: sizeof(struct msb_data), GFP_KERNEL);
2156	if (!msb)
2157	return -ENOMEM;
2158	memstick_set_drvdata(card, data: msb);
2159	msb->card = card;
2160	spin_lock_init(&msb->q_lock);
2161
2162	rc = msb_init_card(card);
2163	if (rc)
2164	goto out_free;
2165
2166	rc = msb_init_disk(card);
2167	if (!rc) {
2168	card->check = msb_check_card;
2169	card->stop = msb_stop;
2170	card->start = msb_start;
2171	return 0;
2172	}
2173	out_free:
2174	memstick_set_drvdata(card, NULL);
2175	msb_data_clear(msb);
2176	kfree(objp: msb);
2177	return rc;
2178	}
2179
2180	static void msb_remove(struct memstick_dev *card)
2181	{
2182	struct msb_data *msb = memstick_get_drvdata(card);
2183	unsigned long flags;
2184
2185	if (!msb->io_queue_stopped)
2186	msb_stop(card);
2187
2188	dbg("Removing the disk device");
2189
2190	/* Take care of unhandled + new requests from now on */
2191	spin_lock_irqsave(&msb->q_lock, flags);
2192	msb->card_dead = true;
2193	spin_unlock_irqrestore(lock: &msb->q_lock, flags);
2194	blk_mq_start_hw_queues(q: msb->queue);
2195
2196	/* Remove the disk */
2197	del_gendisk(gp: msb->disk);
2198	blk_mq_free_tag_set(set: &msb->tag_set);
2199	msb->queue = NULL;
2200
2201	mutex_lock(&msb_disk_lock);
2202	msb_data_clear(msb);
2203	mutex_unlock(lock: &msb_disk_lock);
2204
2205	put_disk(disk: msb->disk);
2206	memstick_set_drvdata(card, NULL);
2207	}
2208
2209	#ifdef CONFIG_PM
2210
2211	static int msb_suspend(struct memstick_dev *card, pm_message_t state)
2212	{
2213	msb_stop(card);
2214	return 0;
2215	}
2216
2217	static int msb_resume(struct memstick_dev *card)
2218	{
2219	struct msb_data *msb = memstick_get_drvdata(card);
2220	struct msb_data *new_msb = NULL;
2221	bool card_dead = true;
2222
2223	#ifndef CONFIG_MEMSTICK_UNSAFE_RESUME
2224	msb->card_dead = true;
2225	return 0;
2226	#endif
2227	mutex_lock(&card->host->lock);
2228
2229	new_msb = kzalloc(size: sizeof(struct msb_data), GFP_KERNEL);
2230	if (!new_msb)
2231	goto out;
2232
2233	new_msb->card = card;
2234	memstick_set_drvdata(card, data: new_msb);
2235	spin_lock_init(&new_msb->q_lock);
2236	sg_init_table(msb->prealloc_sg, MS_BLOCK_MAX_SEGS+1);
2237
2238	if (msb_init_card(card))
2239	goto out;
2240
2241	if (msb->block_size != new_msb->block_size)
2242	goto out;
2243
2244	if (memcmp(p: msb->boot_page, q: new_msb->boot_page,
2245	size: sizeof(struct ms_boot_page)))
2246	goto out;
2247
2248	if (msb->logical_block_count != new_msb->logical_block_count ||
2249	memcmp(p: msb->lba_to_pba_table, q: new_msb->lba_to_pba_table,
2250	size: msb->logical_block_count))
2251	goto out;
2252
2253	if (msb->block_count != new_msb->block_count ||
2254	!bitmap_equal(src1: msb->used_blocks_bitmap, src2: new_msb->used_blocks_bitmap,
2255	nbits: msb->block_count))
2256	goto out;
2257
2258	card_dead = false;
2259	out:
2260	if (card_dead)
2261	dbg("Card was removed/replaced during suspend");
2262
2263	msb->card_dead = card_dead;
2264	memstick_set_drvdata(card, data: msb);
2265
2266	if (new_msb) {
2267	msb_data_clear(msb: new_msb);
2268	kfree(objp: new_msb);
2269	}
2270
2271	msb_start(card);
2272	mutex_unlock(lock: &card->host->lock);
2273	return 0;
2274	}
2275	#else
2276
2277	#define msb_suspend NULL
2278	#define msb_resume NULL
2279
2280	#endif /* CONFIG_PM */
2281
2282	static struct memstick_device_id msb_id_tbl[] = {
2283	{MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_LEGACY, MEMSTICK_CATEGORY_STORAGE,
2284	MEMSTICK_CLASS_FLASH},
2285
2286	{MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_LEGACY, MEMSTICK_CATEGORY_STORAGE,
2287	MEMSTICK_CLASS_ROM},
2288
2289	{MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_LEGACY, MEMSTICK_CATEGORY_STORAGE,
2290	MEMSTICK_CLASS_RO},
2291
2292	{MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_LEGACY, MEMSTICK_CATEGORY_STORAGE,
2293	MEMSTICK_CLASS_WP},
2294
2295	{MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_DUO, MEMSTICK_CATEGORY_STORAGE_DUO,
2296	MEMSTICK_CLASS_DUO},
2297	{}
2298	};
2299	MODULE_DEVICE_TABLE(memstick, msb_id_tbl);
2300
2301
2302	static struct memstick_driver msb_driver = {
2303	.driver = {
2304	.name = DRIVER_NAME,
2305	.owner = THIS_MODULE
2306	},
2307	.id_table = msb_id_tbl,
2308	.probe = msb_probe,
2309	.remove = msb_remove,
2310	.suspend = msb_suspend,
2311	.resume = msb_resume
2312	};
2313
2314	static int __init msb_init(void)
2315	{
2316	int rc = memstick_register_driver(drv: &msb_driver);
2317
2318	if (rc)
2319	pr_err("failed to register memstick driver (error %d)\n", rc);
2320
2321	return rc;
2322	}
2323
2324	static void __exit msb_exit(void)
2325	{
2326	memstick_unregister_driver(drv: &msb_driver);
2327	idr_destroy(&msb_disk_idr);
2328	}
2329
2330	module_init(msb_init);
2331	module_exit(msb_exit);
2332
2333	module_param(cache_flush_timeout, int, S_IRUGO);
2334	MODULE_PARM_DESC(cache_flush_timeout,
2335	"Cache flush timeout in msec (1000 default)");
2336	module_param(debug, int, S_IRUGO | S_IWUSR);
2337	MODULE_PARM_DESC(debug, "Debug level (0-2)");
2338
2339	module_param(verify_writes, bool, S_IRUGO);
2340	MODULE_PARM_DESC(verify_writes, "Read back and check all data that is written");
2341
2342	MODULE_LICENSE("GPL");
2343	MODULE_AUTHOR("Maxim Levitsky");
2344	MODULE_DESCRIPTION("Sony MemoryStick block device driver");
2345