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1// SPDX-License-Identifier: GPL-2.0-or-later2/* 3 * Parallel SCSI (SPI) transport specific attributes exported to sysfs.4 *5 * Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved.6 * Copyright (c) 2004, 2005 James Bottomley <James.Bottomley@SteelEye.com>7 */8#include <linux/ctype.h>9#include <linux/init.h>10#include <linux/module.h>11#include <linux/workqueue.h>12#include <linux/blkdev.h>13#include <linux/mutex.h>14#include <linux/sysfs.h>15#include <linux/slab.h>16#include <linux/suspend.h>17#include <scsi/scsi.h>18#include "scsi_priv.h"19#include <scsi/scsi_device.h>20#include <scsi/scsi_host.h>21#include <scsi/scsi_cmnd.h>22#include <scsi/scsi_eh.h>23#include <scsi/scsi_tcq.h>24#include <scsi/scsi_transport.h>25#include <scsi/scsi_transport_spi.h>26 27#define SPI_NUM_ATTRS 14 /* increase this if you add attributes */28#define SPI_OTHER_ATTRS 1 /* Increase this if you add "always29 * on" attributes */30#define SPI_HOST_ATTRS 131 32#define SPI_MAX_ECHO_BUFFER_SIZE 409633 34#define DV_LOOPS 335#define DV_TIMEOUT (10*HZ)36#define DV_RETRIES 3 /* should only need at most 37 * two cc/ua clears */38 39/* Our blacklist flags */40enum {41 SPI_BLIST_NOIUS = (__force blist_flags_t)0x1,42};43 44/* blacklist table, modelled on scsi_devinfo.c */45static struct {46 char *vendor;47 char *model;48 blist_flags_t flags;49} spi_static_device_list[] __initdata = {50 {"HP", "Ultrium 3-SCSI", SPI_BLIST_NOIUS },51 {"IBM", "ULTRIUM-TD3", SPI_BLIST_NOIUS },52 {NULL, NULL, 0}53};54 55/* Private data accessors (keep these out of the header file) */56#define spi_dv_in_progress(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_in_progress)57#define spi_dv_mutex(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_mutex)58 59struct spi_internal {60 struct scsi_transport_template t;61 struct spi_function_template *f;62};63 64#define to_spi_internal(tmpl) container_of(tmpl, struct spi_internal, t)65 66static const int ppr_to_ps[] = {67 /* The PPR values 0-6 are reserved, fill them in when68 * the committee defines them */69 -1, /* 0x00 */70 -1, /* 0x01 */71 -1, /* 0x02 */72 -1, /* 0x03 */73 -1, /* 0x04 */74 -1, /* 0x05 */75 -1, /* 0x06 */76 3125, /* 0x07 */77 6250, /* 0x08 */78 12500, /* 0x09 */79 25000, /* 0x0a */80 30300, /* 0x0b */81 50000, /* 0x0c */82};83/* The PPR values at which you calculate the period in ns by multiplying84 * by 4 */85#define SPI_STATIC_PPR 0x0c86 87static int sprint_frac(char *dest, int value, int denom)88{89 int frac = value % denom;90 int result = sprintf(dest, "%d", value / denom);91 92 if (frac == 0)93 return result;94 dest[result++] = '.';95 96 do {97 denom /= 10;98 sprintf(dest + result, "%d", frac / denom);99 result++;100 frac %= denom;101 } while (frac);102 103 dest[result++] = '\0';104 return result;105}106 107static int spi_execute(struct scsi_device *sdev, const void *cmd,108 enum req_op op, void *buffer, unsigned int bufflen,109 struct scsi_sense_hdr *sshdr)110{111 blk_opf_t opf = op | REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |112 REQ_FAILFAST_DRIVER;113 struct scsi_failure failure_defs[] = {114 {115 .sense = UNIT_ATTENTION,116 .asc = SCMD_FAILURE_ASC_ANY,117 .ascq = SCMD_FAILURE_ASCQ_ANY,118 .allowed = DV_RETRIES,119 .result = SAM_STAT_CHECK_CONDITION,120 },121 {}122 };123 struct scsi_failures failures = {124 .failure_definitions = failure_defs,125 };126 const struct scsi_exec_args exec_args = {127 /* bypass the SDEV_QUIESCE state with BLK_MQ_REQ_PM */128 .req_flags = BLK_MQ_REQ_PM,129 .sshdr = sshdr,130 .failures = &failures,131 };132 133 return scsi_execute_cmd(sdev, cmd, opf, buffer, bufflen, DV_TIMEOUT, 1,134 &exec_args);135}136 137static struct {138 enum spi_signal_type value;139 char *name;140} signal_types[] = {141 { SPI_SIGNAL_UNKNOWN, "unknown" },142 { SPI_SIGNAL_SE, "SE" },143 { SPI_SIGNAL_LVD, "LVD" },144 { SPI_SIGNAL_HVD, "HVD" },145};146 147static inline const char *spi_signal_to_string(enum spi_signal_type type)148{149 int i;150 151 for (i = 0; i < ARRAY_SIZE(signal_types); i++) {152 if (type == signal_types[i].value)153 return signal_types[i].name;154 }155 return NULL;156}157static inline enum spi_signal_type spi_signal_to_value(const char *name)158{159 int i, len;160 161 for (i = 0; i < ARRAY_SIZE(signal_types); i++) {162 len = strlen(signal_types[i].name);163 if (strncmp(name, signal_types[i].name, len) == 0 &&164 (name[len] == '\n' || name[len] == '\0'))165 return signal_types[i].value;166 }167 return SPI_SIGNAL_UNKNOWN;168}169 170static int spi_host_setup(struct transport_container *tc, struct device *dev,171 struct device *cdev)172{173 struct Scsi_Host *shost = dev_to_shost(dev);174 175 spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;176 177 return 0;178}179 180static int spi_host_configure(struct transport_container *tc,181 struct device *dev,182 struct device *cdev);183 184static DECLARE_TRANSPORT_CLASS(spi_host_class,185 "spi_host",186 spi_host_setup,187 NULL,188 spi_host_configure);189 190static int spi_host_match(struct attribute_container *cont,191 struct device *dev)192{193 struct Scsi_Host *shost;194 195 if (!scsi_is_host_device(dev))196 return 0;197 198 shost = dev_to_shost(dev);199 if (!shost->transportt || shost->transportt->host_attrs.ac.class200 != &spi_host_class.class)201 return 0;202 203 return &shost->transportt->host_attrs.ac == cont;204}205 206static int spi_target_configure(struct transport_container *tc,207 struct device *dev,208 struct device *cdev);209 210static int spi_device_configure(struct transport_container *tc,211 struct device *dev,212 struct device *cdev)213{214 struct scsi_device *sdev = to_scsi_device(dev);215 struct scsi_target *starget = sdev->sdev_target;216 blist_flags_t bflags;217 218 bflags = scsi_get_device_flags_keyed(sdev, &sdev->inquiry[8],219 &sdev->inquiry[16],220 SCSI_DEVINFO_SPI);221 222 /* Populate the target capability fields with the values223 * gleaned from the device inquiry */224 225 spi_support_sync(starget) = scsi_device_sync(sdev);226 spi_support_wide(starget) = scsi_device_wide(sdev);227 spi_support_dt(starget) = scsi_device_dt(sdev);228 spi_support_dt_only(starget) = scsi_device_dt_only(sdev);229 spi_support_ius(starget) = scsi_device_ius(sdev);230 if (bflags & SPI_BLIST_NOIUS) {231 dev_info(dev, "Information Units disabled by blacklist\n");232 spi_support_ius(starget) = 0;233 }234 spi_support_qas(starget) = scsi_device_qas(sdev);235 236 return 0;237}238 239static int spi_setup_transport_attrs(struct transport_container *tc,240 struct device *dev,241 struct device *cdev)242{243 struct scsi_target *starget = to_scsi_target(dev);244 245 spi_period(starget) = -1; /* illegal value */246 spi_min_period(starget) = 0;247 spi_offset(starget) = 0; /* async */248 spi_max_offset(starget) = 255;249 spi_width(starget) = 0; /* narrow */250 spi_max_width(starget) = 1;251 spi_iu(starget) = 0; /* no IU */252 spi_max_iu(starget) = 1;253 spi_dt(starget) = 0; /* ST */254 spi_qas(starget) = 0;255 spi_max_qas(starget) = 1;256 spi_wr_flow(starget) = 0;257 spi_rd_strm(starget) = 0;258 spi_rti(starget) = 0;259 spi_pcomp_en(starget) = 0;260 spi_hold_mcs(starget) = 0;261 spi_dv_pending(starget) = 0;262 spi_dv_in_progress(starget) = 0;263 spi_initial_dv(starget) = 0;264 mutex_init(&spi_dv_mutex(starget));265 266 return 0;267}268 269#define spi_transport_show_simple(field, format_string) \270 \271static ssize_t \272show_spi_transport_##field(struct device *dev, \273 struct device_attribute *attr, char *buf) \274{ \275 struct scsi_target *starget = transport_class_to_starget(dev); \276 struct spi_transport_attrs *tp; \277 \278 tp = (struct spi_transport_attrs *)&starget->starget_data; \279 return snprintf(buf, 20, format_string, tp->field); \280}281 282#define spi_transport_store_simple(field, format_string) \283 \284static ssize_t \285store_spi_transport_##field(struct device *dev, \286 struct device_attribute *attr, \287 const char *buf, size_t count) \288{ \289 int val; \290 struct scsi_target *starget = transport_class_to_starget(dev); \291 struct spi_transport_attrs *tp; \292 \293 tp = (struct spi_transport_attrs *)&starget->starget_data; \294 val = simple_strtoul(buf, NULL, 0); \295 tp->field = val; \296 return count; \297}298 299#define spi_transport_show_function(field, format_string) \300 \301static ssize_t \302show_spi_transport_##field(struct device *dev, \303 struct device_attribute *attr, char *buf) \304{ \305 struct scsi_target *starget = transport_class_to_starget(dev); \306 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \307 struct spi_transport_attrs *tp; \308 struct spi_internal *i = to_spi_internal(shost->transportt); \309 tp = (struct spi_transport_attrs *)&starget->starget_data; \310 if (i->f->get_##field) \311 i->f->get_##field(starget); \312 return snprintf(buf, 20, format_string, tp->field); \313}314 315#define spi_transport_store_function(field, format_string) \316static ssize_t \317store_spi_transport_##field(struct device *dev, \318 struct device_attribute *attr, \319 const char *buf, size_t count) \320{ \321 int val; \322 struct scsi_target *starget = transport_class_to_starget(dev); \323 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \324 struct spi_internal *i = to_spi_internal(shost->transportt); \325 \326 if (!i->f->set_##field) \327 return -EINVAL; \328 val = simple_strtoul(buf, NULL, 0); \329 i->f->set_##field(starget, val); \330 return count; \331}332 333#define spi_transport_store_max(field, format_string) \334static ssize_t \335store_spi_transport_##field(struct device *dev, \336 struct device_attribute *attr, \337 const char *buf, size_t count) \338{ \339 int val; \340 struct scsi_target *starget = transport_class_to_starget(dev); \341 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \342 struct spi_internal *i = to_spi_internal(shost->transportt); \343 struct spi_transport_attrs *tp \344 = (struct spi_transport_attrs *)&starget->starget_data; \345 \346 if (!i->f->set_##field) \347 return -EINVAL; \348 val = simple_strtoul(buf, NULL, 0); \349 if (val > tp->max_##field) \350 val = tp->max_##field; \351 i->f->set_##field(starget, val); \352 return count; \353}354 355#define spi_transport_rd_attr(field, format_string) \356 spi_transport_show_function(field, format_string) \357 spi_transport_store_function(field, format_string) \358static DEVICE_ATTR(field, S_IRUGO, \359 show_spi_transport_##field, \360 store_spi_transport_##field);361 362#define spi_transport_simple_attr(field, format_string) \363 spi_transport_show_simple(field, format_string) \364 spi_transport_store_simple(field, format_string) \365static DEVICE_ATTR(field, S_IRUGO, \366 show_spi_transport_##field, \367 store_spi_transport_##field);368 369#define spi_transport_max_attr(field, format_string) \370 spi_transport_show_function(field, format_string) \371 spi_transport_store_max(field, format_string) \372 spi_transport_simple_attr(max_##field, format_string) \373static DEVICE_ATTR(field, S_IRUGO, \374 show_spi_transport_##field, \375 store_spi_transport_##field);376 377/* The Parallel SCSI Tranport Attributes: */378spi_transport_max_attr(offset, "%d\n");379spi_transport_max_attr(width, "%d\n");380spi_transport_max_attr(iu, "%d\n");381spi_transport_rd_attr(dt, "%d\n");382spi_transport_max_attr(qas, "%d\n");383spi_transport_rd_attr(wr_flow, "%d\n");384spi_transport_rd_attr(rd_strm, "%d\n");385spi_transport_rd_attr(rti, "%d\n");386spi_transport_rd_attr(pcomp_en, "%d\n");387spi_transport_rd_attr(hold_mcs, "%d\n");388 389/* we only care about the first child device that's a real SCSI device390 * so we return 1 to terminate the iteration when we find it */391static int child_iter(struct device *dev, void *data)392{393 if (!scsi_is_sdev_device(dev))394 return 0;395 396 spi_dv_device(to_scsi_device(dev));397 return 1;398}399 400static ssize_t401store_spi_revalidate(struct device *dev, struct device_attribute *attr,402 const char *buf, size_t count)403{404 struct scsi_target *starget = transport_class_to_starget(dev);405 406 device_for_each_child(&starget->dev, NULL, child_iter);407 return count;408}409static DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate);410 411/* Translate the period into ns according to the current spec412 * for SDTR/PPR messages */413static int period_to_str(char *buf, int period)414{415 int len, picosec;416 417 if (period < 0 || period > 0xff) {418 picosec = -1;419 } else if (period <= SPI_STATIC_PPR) {420 picosec = ppr_to_ps[period];421 } else {422 picosec = period * 4000;423 }424 425 if (picosec == -1) {426 len = sprintf(buf, "reserved");427 } else {428 len = sprint_frac(buf, picosec, 1000);429 }430 431 return len;432}433 434static ssize_t435show_spi_transport_period_helper(char *buf, int period)436{437 int len = period_to_str(buf, period);438 buf[len++] = '\n';439 buf[len] = '\0';440 return len;441}442 443static ssize_t444store_spi_transport_period_helper(struct device *dev, const char *buf,445 size_t count, int *periodp)446{447 int j, picosec, period = -1;448 char *endp;449 450 picosec = simple_strtoul(buf, &endp, 10) * 1000;451 if (*endp == '.') {452 int mult = 100;453 do {454 endp++;455 if (!isdigit(*endp))456 break;457 picosec += (*endp - '0') * mult;458 mult /= 10;459 } while (mult > 0);460 }461 462 for (j = 0; j <= SPI_STATIC_PPR; j++) {463 if (ppr_to_ps[j] < picosec)464 continue;465 period = j;466 break;467 }468 469 if (period == -1)470 period = picosec / 4000;471 472 if (period > 0xff)473 period = 0xff;474 475 *periodp = period;476 477 return count;478}479 480static ssize_t481show_spi_transport_period(struct device *dev,482 struct device_attribute *attr, char *buf)483{484 struct scsi_target *starget = transport_class_to_starget(dev);485 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);486 struct spi_internal *i = to_spi_internal(shost->transportt);487 struct spi_transport_attrs *tp =488 (struct spi_transport_attrs *)&starget->starget_data;489 490 if (i->f->get_period)491 i->f->get_period(starget);492 493 return show_spi_transport_period_helper(buf, tp->period);494}495 496static ssize_t497store_spi_transport_period(struct device *cdev, struct device_attribute *attr,498 const char *buf, size_t count)499{500 struct scsi_target *starget = transport_class_to_starget(cdev);501 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);502 struct spi_internal *i = to_spi_internal(shost->transportt);503 struct spi_transport_attrs *tp =504 (struct spi_transport_attrs *)&starget->starget_data;505 int period, retval;506 507 if (!i->f->set_period)508 return -EINVAL;509 510 retval = store_spi_transport_period_helper(cdev, buf, count, &period);511 512 if (period < tp->min_period)513 period = tp->min_period;514 515 i->f->set_period(starget, period);516 517 return retval;518}519 520static DEVICE_ATTR(period, S_IRUGO,521 show_spi_transport_period,522 store_spi_transport_period);523 524static ssize_t525show_spi_transport_min_period(struct device *cdev,526 struct device_attribute *attr, char *buf)527{528 struct scsi_target *starget = transport_class_to_starget(cdev);529 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);530 struct spi_internal *i = to_spi_internal(shost->transportt);531 struct spi_transport_attrs *tp =532 (struct spi_transport_attrs *)&starget->starget_data;533 534 if (!i->f->set_period)535 return -EINVAL;536 537 return show_spi_transport_period_helper(buf, tp->min_period);538}539 540static ssize_t541store_spi_transport_min_period(struct device *cdev,542 struct device_attribute *attr,543 const char *buf, size_t count)544{545 struct scsi_target *starget = transport_class_to_starget(cdev);546 struct spi_transport_attrs *tp =547 (struct spi_transport_attrs *)&starget->starget_data;548 549 return store_spi_transport_period_helper(cdev, buf, count,550 &tp->min_period);551}552 553 554static DEVICE_ATTR(min_period, S_IRUGO,555 show_spi_transport_min_period,556 store_spi_transport_min_period);557 558 559static ssize_t show_spi_host_signalling(struct device *cdev,560 struct device_attribute *attr,561 char *buf)562{563 struct Scsi_Host *shost = transport_class_to_shost(cdev);564 struct spi_internal *i = to_spi_internal(shost->transportt);565 566 if (i->f->get_signalling)567 i->f->get_signalling(shost);568 569 return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost)));570}571static ssize_t store_spi_host_signalling(struct device *dev,572 struct device_attribute *attr,573 const char *buf, size_t count)574{575 struct Scsi_Host *shost = transport_class_to_shost(dev);576 struct spi_internal *i = to_spi_internal(shost->transportt);577 enum spi_signal_type type = spi_signal_to_value(buf);578 579 if (!i->f->set_signalling)580 return -EINVAL;581 582 if (type != SPI_SIGNAL_UNKNOWN)583 i->f->set_signalling(shost, type);584 585 return count;586}587static DEVICE_ATTR(signalling, S_IRUGO,588 show_spi_host_signalling,589 store_spi_host_signalling);590 591static ssize_t show_spi_host_width(struct device *cdev,592 struct device_attribute *attr,593 char *buf)594{595 struct Scsi_Host *shost = transport_class_to_shost(cdev);596 597 return sprintf(buf, "%s\n", shost->max_id == 16 ? "wide" : "narrow");598}599static DEVICE_ATTR(host_width, S_IRUGO,600 show_spi_host_width, NULL);601 602static ssize_t show_spi_host_hba_id(struct device *cdev,603 struct device_attribute *attr,604 char *buf)605{606 struct Scsi_Host *shost = transport_class_to_shost(cdev);607 608 return sprintf(buf, "%d\n", shost->this_id);609}610static DEVICE_ATTR(hba_id, S_IRUGO,611 show_spi_host_hba_id, NULL);612 613#define DV_SET(x, y) \614 if(i->f->set_##x) \615 i->f->set_##x(sdev->sdev_target, y)616 617enum spi_compare_returns {618 SPI_COMPARE_SUCCESS,619 SPI_COMPARE_FAILURE,620 SPI_COMPARE_SKIP_TEST,621};622 623 624/* This is for read/write Domain Validation: If the device supports625 * an echo buffer, we do read/write tests to it */626static enum spi_compare_returns627spi_dv_device_echo_buffer(struct scsi_device *sdev, u8 *buffer,628 u8 *ptr, const int retries)629{630 int len = ptr - buffer;631 int j, k, r, result;632 unsigned int pattern = 0x0000ffff;633 struct scsi_sense_hdr sshdr;634 635 const char spi_write_buffer[] = {636 WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0637 };638 const char spi_read_buffer[] = {639 READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0640 };641 642 /* set up the pattern buffer. Doesn't matter if we spill643 * slightly beyond since that's where the read buffer is */644 for (j = 0; j < len; ) {645 646 /* fill the buffer with counting (test a) */647 for ( ; j < min(len, 32); j++)648 buffer[j] = j;649 k = j;650 /* fill the buffer with alternating words of 0x0 and651 * 0xffff (test b) */652 for ( ; j < min(len, k + 32); j += 2) {653 u16 *word = (u16 *)&buffer[j];654 655 *word = (j & 0x02) ? 0x0000 : 0xffff;656 }657 k = j;658 /* fill with crosstalk (alternating 0x5555 0xaaa)659 * (test c) */660 for ( ; j < min(len, k + 32); j += 2) {661 u16 *word = (u16 *)&buffer[j];662 663 *word = (j & 0x02) ? 0x5555 : 0xaaaa;664 }665 k = j;666 /* fill with shifting bits (test d) */667 for ( ; j < min(len, k + 32); j += 4) {668 u32 *word = (unsigned int *)&buffer[j];669 u32 roll = (pattern & 0x80000000) ? 1 : 0;670 671 *word = pattern;672 pattern = (pattern << 1) | roll;673 }674 /* don't bother with random data (test e) */675 }676 677 for (r = 0; r < retries; r++) {678 result = spi_execute(sdev, spi_write_buffer, REQ_OP_DRV_OUT,679 buffer, len, &sshdr);680 if (result || !scsi_device_online(sdev)) {681 682 scsi_device_set_state(sdev, SDEV_QUIESCE);683 if (result > 0 && scsi_sense_valid(&sshdr)684 && sshdr.sense_key == ILLEGAL_REQUEST685 /* INVALID FIELD IN CDB */686 && sshdr.asc == 0x24 && sshdr.ascq == 0x00)687 /* This would mean that the drive lied688 * to us about supporting an echo689 * buffer (unfortunately some Western690 * Digital drives do precisely this)691 */692 return SPI_COMPARE_SKIP_TEST;693 694 695 sdev_printk(KERN_ERR, sdev, "Write Buffer failure %x\n", result);696 return SPI_COMPARE_FAILURE;697 }698 699 memset(ptr, 0, len);700 spi_execute(sdev, spi_read_buffer, REQ_OP_DRV_IN,701 ptr, len, NULL);702 scsi_device_set_state(sdev, SDEV_QUIESCE);703 704 if (memcmp(buffer, ptr, len) != 0)705 return SPI_COMPARE_FAILURE;706 }707 return SPI_COMPARE_SUCCESS;708}709 710/* This is for the simplest form of Domain Validation: a read test711 * on the inquiry data from the device */712static enum spi_compare_returns713spi_dv_device_compare_inquiry(struct scsi_device *sdev, u8 *buffer,714 u8 *ptr, const int retries)715{716 int r, result;717 const int len = sdev->inquiry_len;718 const char spi_inquiry[] = {719 INQUIRY, 0, 0, 0, len, 0720 };721 722 for (r = 0; r < retries; r++) {723 memset(ptr, 0, len);724 725 result = spi_execute(sdev, spi_inquiry, REQ_OP_DRV_IN,726 ptr, len, NULL);727 728 if(result || !scsi_device_online(sdev)) {729 scsi_device_set_state(sdev, SDEV_QUIESCE);730 return SPI_COMPARE_FAILURE;731 }732 733 /* If we don't have the inquiry data already, the734 * first read gets it */735 if (ptr == buffer) {736 ptr += len;737 --r;738 continue;739 }740 741 if (memcmp(buffer, ptr, len) != 0)742 /* failure */743 return SPI_COMPARE_FAILURE;744 }745 return SPI_COMPARE_SUCCESS;746}747 748static enum spi_compare_returns749spi_dv_retrain(struct scsi_device *sdev, u8 *buffer, u8 *ptr,750 enum spi_compare_returns 751 (*compare_fn)(struct scsi_device *, u8 *, u8 *, int))752{753 struct spi_internal *i = to_spi_internal(sdev->host->transportt);754 struct scsi_target *starget = sdev->sdev_target;755 int period = 0, prevperiod = 0; 756 enum spi_compare_returns retval;757 758 759 for (;;) {760 int newperiod;761 retval = compare_fn(sdev, buffer, ptr, DV_LOOPS);762 763 if (retval == SPI_COMPARE_SUCCESS764 || retval == SPI_COMPARE_SKIP_TEST)765 break;766 767 /* OK, retrain, fallback */768 if (i->f->get_iu)769 i->f->get_iu(starget);770 if (i->f->get_qas)771 i->f->get_qas(starget);772 if (i->f->get_period)773 i->f->get_period(sdev->sdev_target);774 775 /* Here's the fallback sequence; first try turning off776 * IU, then QAS (if we can control them), then finally777 * fall down the periods */778 if (i->f->set_iu && spi_iu(starget)) {779 starget_printk(KERN_ERR, starget, "Domain Validation Disabling Information Units\n");780 DV_SET(iu, 0);781 } else if (i->f->set_qas && spi_qas(starget)) {782 starget_printk(KERN_ERR, starget, "Domain Validation Disabling Quick Arbitration and Selection\n");783 DV_SET(qas, 0);784 } else {785 newperiod = spi_period(starget);786 period = newperiod > period ? newperiod : period;787 if (period < 0x0d)788 period++;789 else790 period += period >> 1;791 792 if (unlikely(period > 0xff || period == prevperiod)) {793 /* Total failure; set to async and return */794 starget_printk(KERN_ERR, starget, "Domain Validation Failure, dropping back to Asynchronous\n");795 DV_SET(offset, 0);796 return SPI_COMPARE_FAILURE;797 }798 starget_printk(KERN_ERR, starget, "Domain Validation detected failure, dropping back\n");799 DV_SET(period, period);800 prevperiod = period;801 }802 }803 return retval;804}805 806static int807spi_dv_device_get_echo_buffer(struct scsi_device *sdev, u8 *buffer)808{809 int l, result;810 811 /* first off do a test unit ready. This can error out 812 * because of reservations or some other reason. If it813 * fails, the device won't let us write to the echo buffer814 * so just return failure */815 816 static const char spi_test_unit_ready[] = {817 TEST_UNIT_READY, 0, 0, 0, 0, 0818 };819 820 static const char spi_read_buffer_descriptor[] = {821 READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0822 };823 824 825 /* We send a set of three TURs to clear any outstanding 826 * unit attention conditions if they exist (Otherwise the827 * buffer tests won't be happy). If the TUR still fails828 * (reservation conflict, device not ready, etc) just829 * skip the write tests */830 for (l = 0; ; l++) {831 result = spi_execute(sdev, spi_test_unit_ready, REQ_OP_DRV_IN,832 NULL, 0, NULL);833 834 if(result) {835 if(l >= 3)836 return 0;837 } else {838 /* TUR succeeded */839 break;840 }841 }842 843 result = spi_execute(sdev, spi_read_buffer_descriptor, 844 REQ_OP_DRV_IN, buffer, 4, NULL);845 846 if (result)847 /* Device has no echo buffer */848 return 0;849 850 return buffer[3] + ((buffer[2] & 0x1f) << 8);851}852 853static void854spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer)855{856 struct spi_internal *i = to_spi_internal(sdev->host->transportt);857 struct scsi_target *starget = sdev->sdev_target;858 struct Scsi_Host *shost = sdev->host;859 int len = sdev->inquiry_len;860 int min_period = spi_min_period(starget);861 int max_width = spi_max_width(starget);862 /* first set us up for narrow async */863 DV_SET(offset, 0);864 DV_SET(width, 0);865 866 if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS)867 != SPI_COMPARE_SUCCESS) {868 starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n");869 /* FIXME: should probably offline the device here? */870 return;871 }872 873 if (!spi_support_wide(starget)) {874 spi_max_width(starget) = 0;875 max_width = 0;876 }877 878 /* test width */879 if (i->f->set_width && max_width) {880 i->f->set_width(starget, 1);881 882 if (spi_dv_device_compare_inquiry(sdev, buffer,883 buffer + len,884 DV_LOOPS)885 != SPI_COMPARE_SUCCESS) {886 starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n");887 i->f->set_width(starget, 0);888 /* Make sure we don't force wide back on by asking889 * for a transfer period that requires it */890 max_width = 0;891 if (min_period < 10)892 min_period = 10;893 }894 }895 896 if (!i->f->set_period)897 return;898 899 /* device can't handle synchronous */900 if (!spi_support_sync(starget) && !spi_support_dt(starget))901 return;902 903 /* len == -1 is the signal that we need to ascertain the904 * presence of an echo buffer before trying to use it. len ==905 * 0 means we don't have an echo buffer */906 len = -1;907 908 retry:909 910 /* now set up to the maximum */911 DV_SET(offset, spi_max_offset(starget));912 DV_SET(period, min_period);913 914 /* try QAS requests; this should be harmless to set if the915 * target supports it */916 if (spi_support_qas(starget) && spi_max_qas(starget)) {917 DV_SET(qas, 1);918 } else {919 DV_SET(qas, 0);920 }921 922 if (spi_support_ius(starget) && spi_max_iu(starget) &&923 min_period < 9) {924 /* This u320 (or u640). Set IU transfers */925 DV_SET(iu, 1);926 /* Then set the optional parameters */927 DV_SET(rd_strm, 1);928 DV_SET(wr_flow, 1);929 DV_SET(rti, 1);930 if (min_period == 8)931 DV_SET(pcomp_en, 1);932 } else {933 DV_SET(iu, 0);934 }935 936 /* now that we've done all this, actually check the bus937 * signal type (if known). Some devices are stupid on938 * a SE bus and still claim they can try LVD only settings */939 if (i->f->get_signalling)940 i->f->get_signalling(shost);941 if (spi_signalling(shost) == SPI_SIGNAL_SE ||942 spi_signalling(shost) == SPI_SIGNAL_HVD ||943 !spi_support_dt(starget)) {944 DV_SET(dt, 0);945 } else {946 DV_SET(dt, 1);947 }948 /* set width last because it will pull all the other949 * parameters down to required values */950 DV_SET(width, max_width);951 952 /* Do the read only INQUIRY tests */953 spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len,954 spi_dv_device_compare_inquiry);955 /* See if we actually managed to negotiate and sustain DT */956 if (i->f->get_dt)957 i->f->get_dt(starget);958 959 /* see if the device has an echo buffer. If it does we can do960 * the SPI pattern write tests. Because of some broken961 * devices, we *only* try this on a device that has actually962 * negotiated DT */963 964 if (len == -1 && spi_dt(starget))965 len = spi_dv_device_get_echo_buffer(sdev, buffer);966 967 if (len <= 0) {968 starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n");969 return;970 }971 972 if (len > SPI_MAX_ECHO_BUFFER_SIZE) {973 starget_printk(KERN_WARNING, starget, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE);974 len = SPI_MAX_ECHO_BUFFER_SIZE;975 }976 977 if (spi_dv_retrain(sdev, buffer, buffer + len,978 spi_dv_device_echo_buffer)979 == SPI_COMPARE_SKIP_TEST) {980 /* OK, the stupid drive can't do a write echo buffer981 * test after all, fall back to the read tests */982 len = 0;983 goto retry;984 }985}986 987 988/** spi_dv_device - Do Domain Validation on the device989 * @sdev: scsi device to validate990 *991 * Performs the domain validation on the given device in the992 * current execution thread. Since DV operations may sleep,993 * the current thread must have user context. Also no SCSI994 * related locks that would deadlock I/O issued by the DV may995 * be held.996 */997void998spi_dv_device(struct scsi_device *sdev)999{1000 struct scsi_target *starget = sdev->sdev_target;1001 const int len = SPI_MAX_ECHO_BUFFER_SIZE*2;1002 unsigned int sleep_flags;1003 u8 *buffer;1004 1005 /*1006 * Because this function and the power management code both call1007 * scsi_device_quiesce(), it is not safe to perform domain validation1008 * while suspend or resume is in progress. Hence the1009 * lock/unlock_system_sleep() calls.1010 */1011 sleep_flags = lock_system_sleep();1012 1013 if (scsi_autopm_get_device(sdev))1014 goto unlock_system_sleep;1015 1016 if (unlikely(spi_dv_in_progress(starget)))1017 goto put_autopm;1018 1019 if (unlikely(scsi_device_get(sdev)))1020 goto put_autopm;1021 1022 spi_dv_in_progress(starget) = 1;1023 1024 buffer = kzalloc(len, GFP_KERNEL);1025 1026 if (unlikely(!buffer))1027 goto put_sdev;1028 1029 /* We need to verify that the actual device will quiesce; the1030 * later target quiesce is just a nice to have */1031 if (unlikely(scsi_device_quiesce(sdev)))1032 goto free_buffer;1033 1034 scsi_target_quiesce(starget);1035 1036 spi_dv_pending(starget) = 1;1037 mutex_lock(&spi_dv_mutex(starget));1038 1039 starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n");1040 1041 spi_dv_device_internal(sdev, buffer);1042 1043 starget_printk(KERN_INFO, starget, "Ending Domain Validation\n");1044 1045 mutex_unlock(&spi_dv_mutex(starget));1046 spi_dv_pending(starget) = 0;1047 1048 scsi_target_resume(starget);1049 1050 spi_initial_dv(starget) = 1;1051 1052free_buffer:1053 kfree(buffer);1054 1055put_sdev:1056 spi_dv_in_progress(starget) = 0;1057 scsi_device_put(sdev);1058put_autopm:1059 scsi_autopm_put_device(sdev);1060 1061unlock_system_sleep:1062 unlock_system_sleep(sleep_flags);1063}1064EXPORT_SYMBOL(spi_dv_device);1065 1066struct work_queue_wrapper {1067 struct work_struct work;1068 struct scsi_device *sdev;1069};1070 1071static void1072spi_dv_device_work_wrapper(struct work_struct *work)1073{1074 struct work_queue_wrapper *wqw =1075 container_of(work, struct work_queue_wrapper, work);1076 struct scsi_device *sdev = wqw->sdev;1077 1078 kfree(wqw);1079 spi_dv_device(sdev);1080 spi_dv_pending(sdev->sdev_target) = 0;1081 scsi_device_put(sdev);1082}1083 1084 1085/**1086 * spi_schedule_dv_device - schedule domain validation to occur on the device1087 * @sdev: The device to validate1088 *1089 * Identical to spi_dv_device() above, except that the DV will be1090 * scheduled to occur in a workqueue later. All memory allocations1091 * are atomic, so may be called from any context including those holding1092 * SCSI locks.1093 */1094void1095spi_schedule_dv_device(struct scsi_device *sdev)1096{1097 struct work_queue_wrapper *wqw =1098 kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC);1099 1100 if (unlikely(!wqw))1101 return;1102 1103 if (unlikely(spi_dv_pending(sdev->sdev_target))) {1104 kfree(wqw);1105 return;1106 }1107 /* Set pending early (dv_device doesn't check it, only sets it) */1108 spi_dv_pending(sdev->sdev_target) = 1;1109 if (unlikely(scsi_device_get(sdev))) {1110 kfree(wqw);1111 spi_dv_pending(sdev->sdev_target) = 0;1112 return;1113 }1114 1115 INIT_WORK(&wqw->work, spi_dv_device_work_wrapper);1116 wqw->sdev = sdev;1117 1118 schedule_work(&wqw->work);1119}1120EXPORT_SYMBOL(spi_schedule_dv_device);1121 1122/**1123 * spi_display_xfer_agreement - Print the current target transfer agreement1124 * @starget: The target for which to display the agreement1125 *1126 * Each SPI port is required to maintain a transfer agreement for each1127 * other port on the bus. This function prints a one-line summary of1128 * the current agreement; more detailed information is available in sysfs.1129 */1130void spi_display_xfer_agreement(struct scsi_target *starget)1131{1132 struct spi_transport_attrs *tp;1133 tp = (struct spi_transport_attrs *)&starget->starget_data;1134 1135 if (tp->offset > 0 && tp->period > 0) {1136 unsigned int picosec, kb100;1137 char *scsi = "FAST-?";1138 char tmp[8];1139 1140 if (tp->period <= SPI_STATIC_PPR) {1141 picosec = ppr_to_ps[tp->period];1142 switch (tp->period) {1143 case 7: scsi = "FAST-320"; break;1144 case 8: scsi = "FAST-160"; break;1145 case 9: scsi = "FAST-80"; break;1146 case 10:1147 case 11: scsi = "FAST-40"; break;1148 case 12: scsi = "FAST-20"; break;1149 }1150 } else {1151 picosec = tp->period * 4000;1152 if (tp->period < 25)1153 scsi = "FAST-20";1154 else if (tp->period < 50)1155 scsi = "FAST-10";1156 else1157 scsi = "FAST-5";1158 }1159 1160 kb100 = (10000000 + picosec / 2) / picosec;1161 if (tp->width)1162 kb100 *= 2;1163 sprint_frac(tmp, picosec, 1000);1164 1165 dev_info(&starget->dev,1166 "%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n",1167 scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10,1168 tp->dt ? "DT" : "ST",1169 tp->iu ? " IU" : "",1170 tp->qas ? " QAS" : "",1171 tp->rd_strm ? " RDSTRM" : "",1172 tp->rti ? " RTI" : "",1173 tp->wr_flow ? " WRFLOW" : "",1174 tp->pcomp_en ? " PCOMP" : "",1175 tp->hold_mcs ? " HMCS" : "",1176 tmp, tp->offset);1177 } else {1178 dev_info(&starget->dev, "%sasynchronous\n",1179 tp->width ? "wide " : "");1180 }1181}1182EXPORT_SYMBOL(spi_display_xfer_agreement);1183 1184int spi_populate_width_msg(unsigned char *msg, int width)1185{1186 msg[0] = EXTENDED_MESSAGE;1187 msg[1] = 2;1188 msg[2] = EXTENDED_WDTR;1189 msg[3] = width;1190 return 4;1191}1192EXPORT_SYMBOL_GPL(spi_populate_width_msg);1193 1194int spi_populate_sync_msg(unsigned char *msg, int period, int offset)1195{1196 msg[0] = EXTENDED_MESSAGE;1197 msg[1] = 3;1198 msg[2] = EXTENDED_SDTR;1199 msg[3] = period;1200 msg[4] = offset;1201 return 5;1202}1203EXPORT_SYMBOL_GPL(spi_populate_sync_msg);1204 1205int spi_populate_ppr_msg(unsigned char *msg, int period, int offset,1206 int width, int options)1207{1208 msg[0] = EXTENDED_MESSAGE;1209 msg[1] = 6;1210 msg[2] = EXTENDED_PPR;1211 msg[3] = period;1212 msg[4] = 0;1213 msg[5] = offset;1214 msg[6] = width;1215 msg[7] = options;1216 return 8;1217}1218EXPORT_SYMBOL_GPL(spi_populate_ppr_msg);1219 1220/**1221 * spi_populate_tag_msg - place a tag message in a buffer1222 * @msg: pointer to the area to place the tag1223 * @cmd: pointer to the scsi command for the tag1224 *1225 * Notes:1226 * designed to create the correct type of tag message for the 1227 * particular request. Returns the size of the tag message.1228 * May return 0 if TCQ is disabled for this device.1229 **/1230int spi_populate_tag_msg(unsigned char *msg, struct scsi_cmnd *cmd)1231{1232 if (cmd->flags & SCMD_TAGGED) {1233 *msg++ = SIMPLE_QUEUE_TAG;1234 *msg++ = scsi_cmd_to_rq(cmd)->tag;1235 return 2;1236 }1237 1238 return 0;1239}1240EXPORT_SYMBOL_GPL(spi_populate_tag_msg);1241 1242#ifdef CONFIG_SCSI_CONSTANTS1243static const char * const one_byte_msgs[] = {1244/* 0x00 */ "Task Complete", NULL /* Extended Message */, "Save Pointers",1245/* 0x03 */ "Restore Pointers", "Disconnect", "Initiator Error", 1246/* 0x06 */ "Abort Task Set", "Message Reject", "Nop", "Message Parity Error",1247/* 0x0a */ "Linked Command Complete", "Linked Command Complete w/flag",1248/* 0x0c */ "Target Reset", "Abort Task", "Clear Task Set", 1249/* 0x0f */ "Initiate Recovery", "Release Recovery",1250/* 0x11 */ "Terminate Process", "Continue Task", "Target Transfer Disable",1251/* 0x14 */ NULL, NULL, "Clear ACA", "LUN Reset"1252};1253 1254static const char * const two_byte_msgs[] = {1255/* 0x20 */ "Simple Queue Tag", "Head of Queue Tag", "Ordered Queue Tag",1256/* 0x23 */ "Ignore Wide Residue", "ACA"1257};1258 1259static const char * const extended_msgs[] = {1260/* 0x00 */ "Modify Data Pointer", "Synchronous Data Transfer Request",1261/* 0x02 */ "SCSI-I Extended Identify", "Wide Data Transfer Request",1262/* 0x04 */ "Parallel Protocol Request", "Modify Bidirectional Data Pointer"1263};1264 1265static void print_nego(const unsigned char *msg, int per, int off, int width)1266{1267 if (per) {1268 char buf[20];1269 period_to_str(buf, msg[per]);1270 printk("period = %s ns ", buf);1271 }1272 1273 if (off)1274 printk("offset = %d ", msg[off]);1275 if (width)1276 printk("width = %d ", 8 << msg[width]);1277}1278 1279static void print_ptr(const unsigned char *msg, int msb, const char *desc)1280{1281 int ptr = (msg[msb] << 24) | (msg[msb+1] << 16) | (msg[msb+2] << 8) |1282 msg[msb+3];1283 printk("%s = %d ", desc, ptr);1284}1285 1286int spi_print_msg(const unsigned char *msg)1287{1288 int len = 1, i;1289 if (msg[0] == EXTENDED_MESSAGE) {1290 len = 2 + msg[1];1291 if (len == 2)1292 len += 256;1293 if (msg[2] < ARRAY_SIZE(extended_msgs))1294 printk ("%s ", extended_msgs[msg[2]]); 1295 else 1296 printk ("Extended Message, reserved code (0x%02x) ",1297 (int) msg[2]);1298 switch (msg[2]) {1299 case EXTENDED_MODIFY_DATA_POINTER:1300 print_ptr(msg, 3, "pointer");1301 break;1302 case EXTENDED_SDTR:1303 print_nego(msg, 3, 4, 0);1304 break;1305 case EXTENDED_WDTR:1306 print_nego(msg, 0, 0, 3);1307 break;1308 case EXTENDED_PPR:1309 print_nego(msg, 3, 5, 6);1310 break;1311 case EXTENDED_MODIFY_BIDI_DATA_PTR:1312 print_ptr(msg, 3, "out");1313 print_ptr(msg, 7, "in");1314 break;1315 default:1316 for (i = 2; i < len; ++i) 1317 printk("%02x ", msg[i]);1318 }1319 /* Identify */1320 } else if (msg[0] & 0x80) {1321 printk("Identify disconnect %sallowed %s %d ",1322 (msg[0] & 0x40) ? "" : "not ",1323 (msg[0] & 0x20) ? "target routine" : "lun",1324 msg[0] & 0x7);1325 /* Normal One byte */1326 } else if (msg[0] < 0x1f) {1327 if (msg[0] < ARRAY_SIZE(one_byte_msgs) && one_byte_msgs[msg[0]])1328 printk("%s ", one_byte_msgs[msg[0]]);1329 else1330 printk("reserved (%02x) ", msg[0]);1331 } else if (msg[0] == 0x55) {1332 printk("QAS Request ");1333 /* Two byte */1334 } else if (msg[0] <= 0x2f) {1335 if ((msg[0] - 0x20) < ARRAY_SIZE(two_byte_msgs))1336 printk("%s %02x ", two_byte_msgs[msg[0] - 0x20], 1337 msg[1]);1338 else 1339 printk("reserved two byte (%02x %02x) ", 1340 msg[0], msg[1]);1341 len = 2;1342 } else 1343 printk("reserved ");1344 return len;1345}1346EXPORT_SYMBOL(spi_print_msg);1347 1348#else /* ifndef CONFIG_SCSI_CONSTANTS */1349 1350int spi_print_msg(const unsigned char *msg)1351{1352 int len = 1, i;1353 1354 if (msg[0] == EXTENDED_MESSAGE) {1355 len = 2 + msg[1];1356 if (len == 2)1357 len += 256;1358 for (i = 0; i < len; ++i)1359 printk("%02x ", msg[i]);1360 /* Identify */1361 } else if (msg[0] & 0x80) {1362 printk("%02x ", msg[0]);1363 /* Normal One byte */1364 } else if ((msg[0] < 0x1f) || (msg[0] == 0x55)) {1365 printk("%02x ", msg[0]);1366 /* Two byte */1367 } else if (msg[0] <= 0x2f) {1368 printk("%02x %02x", msg[0], msg[1]);1369 len = 2;1370 } else 1371 printk("%02x ", msg[0]);1372 return len;1373}1374EXPORT_SYMBOL(spi_print_msg);1375#endif /* ! CONFIG_SCSI_CONSTANTS */1376 1377static int spi_device_match(struct attribute_container *cont,1378 struct device *dev)1379{1380 struct scsi_device *sdev;1381 struct Scsi_Host *shost;1382 struct spi_internal *i;1383 1384 if (!scsi_is_sdev_device(dev))1385 return 0;1386 1387 sdev = to_scsi_device(dev);1388 shost = sdev->host;1389 if (!shost->transportt || shost->transportt->host_attrs.ac.class1390 != &spi_host_class.class)1391 return 0;1392 /* Note: this class has no device attributes, so it has1393 * no per-HBA allocation and thus we don't need to distinguish1394 * the attribute containers for the device */1395 i = to_spi_internal(shost->transportt);1396 if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target))1397 return 0;1398 return 1;1399}1400 1401static int spi_target_match(struct attribute_container *cont,1402 struct device *dev)1403{1404 struct Scsi_Host *shost;1405 struct scsi_target *starget;1406 struct spi_internal *i;1407 1408 if (!scsi_is_target_device(dev))1409 return 0;1410 1411 shost = dev_to_shost(dev->parent);1412 if (!shost->transportt || shost->transportt->host_attrs.ac.class1413 != &spi_host_class.class)1414 return 0;1415 1416 i = to_spi_internal(shost->transportt);1417 starget = to_scsi_target(dev);1418 1419 if (i->f->deny_binding && i->f->deny_binding(starget))1420 return 0;1421 1422 return &i->t.target_attrs.ac == cont;1423}1424 1425static DECLARE_TRANSPORT_CLASS(spi_transport_class,1426 "spi_transport",1427 spi_setup_transport_attrs,1428 NULL,1429 spi_target_configure);1430 1431static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class,1432 spi_device_match,1433 spi_device_configure);1434 1435static struct attribute *host_attributes[] = {1436 &dev_attr_signalling.attr,1437 &dev_attr_host_width.attr,1438 &dev_attr_hba_id.attr,1439 NULL1440};1441 1442static struct attribute_group host_attribute_group = {1443 .attrs = host_attributes,1444};1445 1446static int spi_host_configure(struct transport_container *tc,1447 struct device *dev,1448 struct device *cdev)1449{1450 struct kobject *kobj = &cdev->kobj;1451 struct Scsi_Host *shost = transport_class_to_shost(cdev);1452 struct spi_internal *si = to_spi_internal(shost->transportt);1453 struct attribute *attr = &dev_attr_signalling.attr;1454 int rc = 0;1455 1456 if (si->f->set_signalling)1457 rc = sysfs_chmod_file(kobj, attr, attr->mode | S_IWUSR);1458 1459 return rc;1460}1461 1462/* returns true if we should be showing the variable. Also1463 * overloads the return by setting 1<<1 if the attribute should1464 * be writeable */1465#define TARGET_ATTRIBUTE_HELPER(name) \1466 (si->f->show_##name ? S_IRUGO : 0) | \1467 (si->f->set_##name ? S_IWUSR : 0)1468 1469static umode_t target_attribute_is_visible(struct kobject *kobj,1470 struct attribute *attr, int i)1471{1472 struct device *cdev = container_of(kobj, struct device, kobj);1473 struct scsi_target *starget = transport_class_to_starget(cdev);1474 struct Scsi_Host *shost = transport_class_to_shost(cdev);1475 struct spi_internal *si = to_spi_internal(shost->transportt);1476 1477 if (attr == &dev_attr_period.attr &&1478 spi_support_sync(starget))1479 return TARGET_ATTRIBUTE_HELPER(period);1480 else if (attr == &dev_attr_min_period.attr &&1481 spi_support_sync(starget))1482 return TARGET_ATTRIBUTE_HELPER(period);1483 else if (attr == &dev_attr_offset.attr &&1484 spi_support_sync(starget))1485 return TARGET_ATTRIBUTE_HELPER(offset);1486 else if (attr == &dev_attr_max_offset.attr &&1487 spi_support_sync(starget))1488 return TARGET_ATTRIBUTE_HELPER(offset);1489 else if (attr == &dev_attr_width.attr &&1490 spi_support_wide(starget))1491 return TARGET_ATTRIBUTE_HELPER(width);1492 else if (attr == &dev_attr_max_width.attr &&1493 spi_support_wide(starget))1494 return TARGET_ATTRIBUTE_HELPER(width);1495 else if (attr == &dev_attr_iu.attr &&1496 spi_support_ius(starget))1497 return TARGET_ATTRIBUTE_HELPER(iu);1498 else if (attr == &dev_attr_max_iu.attr &&1499 spi_support_ius(starget))1500 return TARGET_ATTRIBUTE_HELPER(iu);1501 else if (attr == &dev_attr_dt.attr &&1502 spi_support_dt(starget))1503 return TARGET_ATTRIBUTE_HELPER(dt);1504 else if (attr == &dev_attr_qas.attr &&1505 spi_support_qas(starget))1506 return TARGET_ATTRIBUTE_HELPER(qas);1507 else if (attr == &dev_attr_max_qas.attr &&1508 spi_support_qas(starget))1509 return TARGET_ATTRIBUTE_HELPER(qas);1510 else if (attr == &dev_attr_wr_flow.attr &&1511 spi_support_ius(starget))1512 return TARGET_ATTRIBUTE_HELPER(wr_flow);1513 else if (attr == &dev_attr_rd_strm.attr &&1514 spi_support_ius(starget))1515 return TARGET_ATTRIBUTE_HELPER(rd_strm);1516 else if (attr == &dev_attr_rti.attr &&1517 spi_support_ius(starget))1518 return TARGET_ATTRIBUTE_HELPER(rti);1519 else if (attr == &dev_attr_pcomp_en.attr &&1520 spi_support_ius(starget))1521 return TARGET_ATTRIBUTE_HELPER(pcomp_en);1522 else if (attr == &dev_attr_hold_mcs.attr &&1523 spi_support_ius(starget))1524 return TARGET_ATTRIBUTE_HELPER(hold_mcs);1525 else if (attr == &dev_attr_revalidate.attr)1526 return S_IWUSR;1527 1528 return 0;1529}1530 1531static struct attribute *target_attributes[] = {1532 &dev_attr_period.attr,1533 &dev_attr_min_period.attr,1534 &dev_attr_offset.attr,1535 &dev_attr_max_offset.attr,1536 &dev_attr_width.attr,1537 &dev_attr_max_width.attr,1538 &dev_attr_iu.attr,1539 &dev_attr_max_iu.attr,1540 &dev_attr_dt.attr,1541 &dev_attr_qas.attr,1542 &dev_attr_max_qas.attr,1543 &dev_attr_wr_flow.attr,1544 &dev_attr_rd_strm.attr,1545 &dev_attr_rti.attr,1546 &dev_attr_pcomp_en.attr,1547 &dev_attr_hold_mcs.attr,1548 &dev_attr_revalidate.attr,1549 NULL1550};1551 1552static struct attribute_group target_attribute_group = {1553 .attrs = target_attributes,1554 .is_visible = target_attribute_is_visible,1555};1556 1557static int spi_target_configure(struct transport_container *tc,1558 struct device *dev,1559 struct device *cdev)1560{1561 struct kobject *kobj = &cdev->kobj;1562 1563 /* force an update based on parameters read from the device */1564 sysfs_update_group(kobj, &target_attribute_group);1565 1566 return 0;1567}1568 1569struct scsi_transport_template *1570spi_attach_transport(struct spi_function_template *ft)1571{1572 struct spi_internal *i = kzalloc(sizeof(struct spi_internal),1573 GFP_KERNEL);1574 1575 if (unlikely(!i))1576 return NULL;1577 1578 i->t.target_attrs.ac.class = &spi_transport_class.class;1579 i->t.target_attrs.ac.grp = &target_attribute_group;1580 i->t.target_attrs.ac.match = spi_target_match;1581 transport_container_register(&i->t.target_attrs);1582 i->t.target_size = sizeof(struct spi_transport_attrs);1583 i->t.host_attrs.ac.class = &spi_host_class.class;1584 i->t.host_attrs.ac.grp = &host_attribute_group;1585 i->t.host_attrs.ac.match = spi_host_match;1586 transport_container_register(&i->t.host_attrs);1587 i->t.host_size = sizeof(struct spi_host_attrs);1588 i->f = ft;1589 1590 return &i->t;1591}1592EXPORT_SYMBOL(spi_attach_transport);1593 1594void spi_release_transport(struct scsi_transport_template *t)1595{1596 struct spi_internal *i = to_spi_internal(t);1597 1598 transport_container_unregister(&i->t.target_attrs);1599 transport_container_unregister(&i->t.host_attrs);1600 1601 kfree(i);1602}1603EXPORT_SYMBOL(spi_release_transport);1604 1605static __init int spi_transport_init(void)1606{1607 int error = scsi_dev_info_add_list(SCSI_DEVINFO_SPI,1608 "SCSI Parallel Transport Class");1609 if (!error) {1610 int i;1611 1612 for (i = 0; spi_static_device_list[i].vendor; i++)1613 scsi_dev_info_list_add_keyed(1, /* compatible */1614 spi_static_device_list[i].vendor,1615 spi_static_device_list[i].model,1616 NULL,1617 spi_static_device_list[i].flags,1618 SCSI_DEVINFO_SPI);1619 }1620 1621 error = transport_class_register(&spi_transport_class);1622 if (error)1623 return error;1624 error = anon_transport_class_register(&spi_device_class);1625 return transport_class_register(&spi_host_class);1626}1627 1628static void __exit spi_transport_exit(void)1629{1630 transport_class_unregister(&spi_transport_class);1631 anon_transport_class_unregister(&spi_device_class);1632 transport_class_unregister(&spi_host_class);1633 scsi_dev_info_remove_list(SCSI_DEVINFO_SPI);1634}1635 1636MODULE_AUTHOR("Martin Hicks");1637MODULE_DESCRIPTION("SPI Transport Attributes");1638MODULE_LICENSE("GPL");1639 1640module_init(spi_transport_init);1641module_exit(spi_transport_exit);1642