1105 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * libata-pmp.c - libata port multiplier support4 *5 * Copyright (c) 2007 SUSE Linux Products GmbH6 * Copyright (c) 2007 Tejun Heo <teheo@suse.de>7 */8 9#include <linux/kernel.h>10#include <linux/export.h>11#include <linux/libata.h>12#include <linux/slab.h>13#include "libata.h"14#include "libata-transport.h"15 16const struct ata_port_operations sata_pmp_port_ops = {17 .inherits = &sata_port_ops,18 .pmp_prereset = ata_std_prereset,19 .pmp_hardreset = sata_std_hardreset,20 .pmp_postreset = ata_std_postreset,21 .error_handler = sata_pmp_error_handler,22};23 24/**25 * sata_pmp_read - read PMP register26 * @link: link to read PMP register for27 * @reg: register to read28 * @r_val: resulting value29 *30 * Read PMP register.31 *32 * LOCKING:33 * Kernel thread context (may sleep).34 *35 * RETURNS:36 * 0 on success, AC_ERR_* mask on failure.37 */38static unsigned int sata_pmp_read(struct ata_link *link, int reg, u32 *r_val)39{40 struct ata_port *ap = link->ap;41 struct ata_device *pmp_dev = ap->link.device;42 struct ata_taskfile tf;43 unsigned int err_mask;44 45 ata_tf_init(pmp_dev, &tf);46 tf.command = ATA_CMD_PMP_READ;47 tf.protocol = ATA_PROT_NODATA;48 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;49 tf.feature = reg;50 tf.device = link->pmp;51 52 err_mask = ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0,53 SATA_PMP_RW_TIMEOUT);54 if (err_mask)55 return err_mask;56 57 *r_val = tf.nsect | tf.lbal << 8 | tf.lbam << 16 | tf.lbah << 24;58 return 0;59}60 61/**62 * sata_pmp_write - write PMP register63 * @link: link to write PMP register for64 * @reg: register to write65 * @val: value to write66 *67 * Write PMP register.68 *69 * LOCKING:70 * Kernel thread context (may sleep).71 *72 * RETURNS:73 * 0 on success, AC_ERR_* mask on failure.74 */75static unsigned int sata_pmp_write(struct ata_link *link, int reg, u32 val)76{77 struct ata_port *ap = link->ap;78 struct ata_device *pmp_dev = ap->link.device;79 struct ata_taskfile tf;80 81 ata_tf_init(pmp_dev, &tf);82 tf.command = ATA_CMD_PMP_WRITE;83 tf.protocol = ATA_PROT_NODATA;84 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;85 tf.feature = reg;86 tf.device = link->pmp;87 tf.nsect = val & 0xff;88 tf.lbal = (val >> 8) & 0xff;89 tf.lbam = (val >> 16) & 0xff;90 tf.lbah = (val >> 24) & 0xff;91 92 return ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0,93 SATA_PMP_RW_TIMEOUT);94}95 96/**97 * sata_pmp_qc_defer_cmd_switch - qc_defer for command switching PMP98 * @qc: ATA command in question99 *100 * A host which has command switching PMP support cannot issue101 * commands to multiple links simultaneously.102 *103 * LOCKING:104 * spin_lock_irqsave(host lock)105 *106 * RETURNS:107 * ATA_DEFER_* if deferring is needed, 0 otherwise.108 */109int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc)110{111 struct ata_link *link = qc->dev->link;112 struct ata_port *ap = link->ap;113 114 if (ap->excl_link == NULL || ap->excl_link == link) {115 if (ap->nr_active_links == 0 || ata_link_active(link)) {116 qc->flags |= ATA_QCFLAG_CLEAR_EXCL;117 return ata_std_qc_defer(qc);118 }119 120 ap->excl_link = link;121 }122 123 return ATA_DEFER_PORT;124}125 126/**127 * sata_pmp_scr_read - read PSCR128 * @link: ATA link to read PSCR for129 * @reg: PSCR to read130 * @r_val: resulting value131 *132 * Read PSCR @reg into @r_val for @link, to be called from133 * ata_scr_read().134 *135 * LOCKING:136 * Kernel thread context (may sleep).137 *138 * RETURNS:139 * 0 on success, -errno on failure.140 */141int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val)142{143 unsigned int err_mask;144 145 if (reg > SATA_PMP_PSCR_CONTROL)146 return -EINVAL;147 148 err_mask = sata_pmp_read(link, reg, r_val);149 if (err_mask) {150 ata_link_warn(link, "failed to read SCR %d (Emask=0x%x)\n",151 reg, err_mask);152 return -EIO;153 }154 return 0;155}156 157/**158 * sata_pmp_scr_write - write PSCR159 * @link: ATA link to write PSCR for160 * @reg: PSCR to write161 * @val: value to be written162 *163 * Write @val to PSCR @reg for @link, to be called from164 * ata_scr_write() and ata_scr_write_flush().165 *166 * LOCKING:167 * Kernel thread context (may sleep).168 *169 * RETURNS:170 * 0 on success, -errno on failure.171 */172int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val)173{174 unsigned int err_mask;175 176 if (reg > SATA_PMP_PSCR_CONTROL)177 return -EINVAL;178 179 err_mask = sata_pmp_write(link, reg, val);180 if (err_mask) {181 ata_link_warn(link, "failed to write SCR %d (Emask=0x%x)\n",182 reg, err_mask);183 return -EIO;184 }185 return 0;186}187 188/**189 * sata_pmp_set_lpm - configure LPM for a PMP link190 * @link: PMP link to configure LPM for191 * @policy: target LPM policy192 * @hints: LPM hints193 *194 * Configure LPM for @link. This function will contain any PMP195 * specific workarounds if necessary.196 *197 * LOCKING:198 * EH context.199 *200 * RETURNS:201 * 0 on success, -errno on failure.202 */203int sata_pmp_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,204 unsigned hints)205{206 return sata_link_scr_lpm(link, policy, true);207}208 209/**210 * sata_pmp_read_gscr - read GSCR block of SATA PMP211 * @dev: PMP device212 * @gscr: buffer to read GSCR block into213 *214 * Read selected PMP GSCRs from the PMP at @dev. This will serve215 * as configuration and identification info for the PMP.216 *217 * LOCKING:218 * Kernel thread context (may sleep).219 *220 * RETURNS:221 * 0 on success, -errno on failure.222 */223static int sata_pmp_read_gscr(struct ata_device *dev, u32 *gscr)224{225 static const int gscr_to_read[] = { 0, 1, 2, 32, 33, 64, 96 };226 int i;227 228 for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) {229 int reg = gscr_to_read[i];230 unsigned int err_mask;231 232 err_mask = sata_pmp_read(dev->link, reg, &gscr[reg]);233 if (err_mask) {234 ata_dev_err(dev, "failed to read PMP GSCR[%d] (Emask=0x%x)\n",235 reg, err_mask);236 return -EIO;237 }238 }239 240 return 0;241}242 243static const char *sata_pmp_spec_rev_str(const u32 *gscr)244{245 u32 rev = gscr[SATA_PMP_GSCR_REV];246 247 if (rev & (1 << 3))248 return "1.2";249 if (rev & (1 << 2))250 return "1.1";251 if (rev & (1 << 1))252 return "1.0";253 return "<unknown>";254}255 256#define PMP_GSCR_SII_POL 129257 258static int sata_pmp_configure(struct ata_device *dev, int print_info)259{260 struct ata_port *ap = dev->link->ap;261 u32 *gscr = dev->gscr;262 u16 vendor = sata_pmp_gscr_vendor(gscr);263 u16 devid = sata_pmp_gscr_devid(gscr);264 unsigned int err_mask = 0;265 const char *reason;266 int nr_ports, rc;267 268 nr_ports = sata_pmp_gscr_ports(gscr);269 270 if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) {271 rc = -EINVAL;272 reason = "invalid nr_ports";273 goto fail;274 }275 276 if ((ap->flags & ATA_FLAG_AN) &&277 (gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY))278 dev->flags |= ATA_DFLAG_AN;279 280 /* monitor SERR_PHYRDY_CHG on fan-out ports */281 err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN,282 SERR_PHYRDY_CHG);283 if (err_mask) {284 rc = -EIO;285 reason = "failed to write GSCR_ERROR_EN";286 goto fail;287 }288 289 /* Disable sending Early R_OK.290 * With "cached read" HDD testing and multiple ports busy on a SATA291 * host controller, 3x26 PMP will very rarely drop a deferred292 * R_OK that was intended for the host. Symptom will be all293 * 5 drives under test will timeout, get reset, and recover.294 */295 if (vendor == 0x1095 && (devid == 0x3726 || devid == 0x3826)) {296 u32 reg;297 298 err_mask = sata_pmp_read(&ap->link, PMP_GSCR_SII_POL, ®);299 if (err_mask) {300 rc = -EIO;301 reason = "failed to read Sil3x26 Private Register";302 goto fail;303 }304 reg &= ~0x1;305 err_mask = sata_pmp_write(&ap->link, PMP_GSCR_SII_POL, reg);306 if (err_mask) {307 rc = -EIO;308 reason = "failed to write Sil3x26 Private Register";309 goto fail;310 }311 }312 313 if (print_info) {314 ata_dev_info(dev, "Port Multiplier %s, "315 "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n",316 sata_pmp_spec_rev_str(gscr), vendor, devid,317 sata_pmp_gscr_rev(gscr),318 nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN],319 gscr[SATA_PMP_GSCR_FEAT]);320 321 if (!(dev->flags & ATA_DFLAG_AN))322 ata_dev_info(dev,323 "Asynchronous notification not supported, "324 "hotplug won't work on fan-out ports. Use warm-plug instead.\n");325 }326 327 return 0;328 329 fail:330 ata_dev_err(dev,331 "failed to configure Port Multiplier (%s, Emask=0x%x)\n",332 reason, err_mask);333 return rc;334}335 336static int sata_pmp_init_links (struct ata_port *ap, int nr_ports)337{338 struct ata_link *pmp_link = ap->pmp_link;339 int i, err;340 341 if (!pmp_link) {342 pmp_link = kcalloc(SATA_PMP_MAX_PORTS, sizeof(pmp_link[0]),343 GFP_NOIO);344 if (!pmp_link)345 return -ENOMEM;346 347 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)348 ata_link_init(ap, &pmp_link[i], i);349 350 ap->pmp_link = pmp_link;351 352 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) {353 err = ata_tlink_add(&pmp_link[i]);354 if (err) {355 goto err_tlink;356 }357 }358 }359 360 for (i = 0; i < nr_ports; i++) {361 struct ata_link *link = &pmp_link[i];362 struct ata_eh_context *ehc = &link->eh_context;363 364 link->flags = 0;365 ehc->i.probe_mask |= ATA_ALL_DEVICES;366 ehc->i.action |= ATA_EH_RESET;367 }368 369 return 0;370 err_tlink:371 while (--i >= 0)372 ata_tlink_delete(&pmp_link[i]);373 kfree(pmp_link);374 ap->pmp_link = NULL;375 return err;376}377 378static void sata_pmp_quirks(struct ata_port *ap)379{380 u32 *gscr = ap->link.device->gscr;381 u16 vendor = sata_pmp_gscr_vendor(gscr);382 u16 devid = sata_pmp_gscr_devid(gscr);383 struct ata_link *link;384 385 if (vendor == 0x1095 && (devid == 0x3726 || devid == 0x3826)) {386 /* sil3x26 quirks */387 ata_for_each_link(link, ap, EDGE) {388 /* link reports offline after LPM */389 link->flags |= ATA_LFLAG_NO_LPM;390 391 /*392 * Class code report is unreliable and SRST times393 * out under certain configurations.394 */395 if (link->pmp < 5)396 link->flags |= ATA_LFLAG_NO_SRST |397 ATA_LFLAG_ASSUME_ATA;398 399 /* port 5 is for SEMB device and it doesn't like SRST */400 if (link->pmp == 5)401 link->flags |= ATA_LFLAG_NO_SRST |402 ATA_LFLAG_ASSUME_SEMB;403 }404 } else if (vendor == 0x1095 && devid == 0x4723) {405 /*406 * sil4723 quirks407 *408 * Link reports offline after LPM. Class code report is409 * unreliable. SIMG PMPs never got SRST reliable and the410 * config device at port 2 locks up on SRST.411 */412 ata_for_each_link(link, ap, EDGE)413 link->flags |= ATA_LFLAG_NO_LPM |414 ATA_LFLAG_NO_SRST |415 ATA_LFLAG_ASSUME_ATA;416 } else if (vendor == 0x1095 && devid == 0x4726) {417 /* sil4726 quirks */418 ata_for_each_link(link, ap, EDGE) {419 /* link reports offline after LPM */420 link->flags |= ATA_LFLAG_NO_LPM;421 422 /* Class code report is unreliable and SRST423 * times out under certain configurations.424 * Config device can be at port 0 or 5 and425 * locks up on SRST.426 */427 if (link->pmp <= 5)428 link->flags |= ATA_LFLAG_NO_SRST |429 ATA_LFLAG_ASSUME_ATA;430 431 /* Port 6 is for SEMB device which doesn't432 * like SRST either.433 */434 if (link->pmp == 6)435 link->flags |= ATA_LFLAG_NO_SRST |436 ATA_LFLAG_ASSUME_SEMB;437 }438 } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 ||439 devid == 0x5734 || devid == 0x5744)) {440 /* sil5723/5744 quirks */441 442 /* sil5723/5744 has either two or three downstream443 * ports depending on operation mode. The last port444 * is empty if any actual IO device is available or445 * occupied by a pseudo configuration device446 * otherwise. Don't try hard to recover it.447 */448 ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY;449 } else if (vendor == 0x197b && (devid == 0x2352 || devid == 0x0325)) {450 /*451 * 0x2352: found in Thermaltake BlackX Duet, jmicron JMB350?452 * 0x0325: jmicron JMB394.453 */454 ata_for_each_link(link, ap, EDGE) {455 /* SRST breaks detection and disks get misclassified456 * LPM disabled to avoid potential problems457 */458 link->flags |= ATA_LFLAG_NO_LPM |459 ATA_LFLAG_NO_SRST |460 ATA_LFLAG_ASSUME_ATA;461 }462 } else if (vendor == 0x11ab && devid == 0x4140) {463 /* Marvell 4140 quirks */464 ata_for_each_link(link, ap, EDGE) {465 /* port 4 is for SEMB device and it doesn't like SRST */466 if (link->pmp == 4)467 link->flags |= ATA_LFLAG_DISABLED;468 }469 }470}471 472/**473 * sata_pmp_attach - attach a SATA PMP device474 * @dev: SATA PMP device to attach475 *476 * Configure and attach SATA PMP device @dev. This function is477 * also responsible for allocating and initializing PMP links.478 *479 * LOCKING:480 * Kernel thread context (may sleep).481 *482 * RETURNS:483 * 0 on success, -errno on failure.484 */485int sata_pmp_attach(struct ata_device *dev)486{487 struct ata_link *link = dev->link;488 struct ata_port *ap = link->ap;489 unsigned long flags;490 struct ata_link *tlink;491 int rc;492 493 /* is it hanging off the right place? */494 if (!sata_pmp_supported(ap)) {495 ata_dev_err(dev, "host does not support Port Multiplier\n");496 return -EINVAL;497 }498 499 if (!ata_is_host_link(link)) {500 ata_dev_err(dev, "Port Multipliers cannot be nested\n");501 return -EINVAL;502 }503 504 if (dev->devno) {505 ata_dev_err(dev, "Port Multiplier must be the first device\n");506 return -EINVAL;507 }508 509 WARN_ON(link->pmp != 0);510 link->pmp = SATA_PMP_CTRL_PORT;511 512 /* read GSCR block */513 rc = sata_pmp_read_gscr(dev, dev->gscr);514 if (rc)515 goto fail;516 517 /* config PMP */518 rc = sata_pmp_configure(dev, 1);519 if (rc)520 goto fail;521 522 rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr));523 if (rc) {524 ata_dev_info(dev, "failed to initialize PMP links\n");525 goto fail;526 }527 528 /* attach it */529 spin_lock_irqsave(ap->lock, flags);530 WARN_ON(ap->nr_pmp_links);531 ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr);532 spin_unlock_irqrestore(ap->lock, flags);533 534 sata_pmp_quirks(ap);535 536 if (ap->ops->pmp_attach)537 ap->ops->pmp_attach(ap);538 539 ata_for_each_link(tlink, ap, EDGE)540 sata_link_init_spd(tlink);541 542 return 0;543 544 fail:545 link->pmp = 0;546 return rc;547}548 549/**550 * sata_pmp_detach - detach a SATA PMP device551 * @dev: SATA PMP device to detach552 *553 * Detach SATA PMP device @dev. This function is also554 * responsible for deconfiguring PMP links.555 *556 * LOCKING:557 * Kernel thread context (may sleep).558 */559static void sata_pmp_detach(struct ata_device *dev)560{561 struct ata_link *link = dev->link;562 struct ata_port *ap = link->ap;563 struct ata_link *tlink;564 unsigned long flags;565 566 ata_dev_info(dev, "Port Multiplier detaching\n");567 568 WARN_ON(!ata_is_host_link(link) || dev->devno ||569 link->pmp != SATA_PMP_CTRL_PORT);570 571 if (ap->ops->pmp_detach)572 ap->ops->pmp_detach(ap);573 574 ata_for_each_link(tlink, ap, EDGE)575 ata_eh_detach_dev(tlink->device);576 577 spin_lock_irqsave(ap->lock, flags);578 ap->nr_pmp_links = 0;579 link->pmp = 0;580 spin_unlock_irqrestore(ap->lock, flags);581}582 583/**584 * sata_pmp_same_pmp - does new GSCR matches the configured PMP?585 * @dev: PMP device to compare against586 * @new_gscr: GSCR block of the new device587 *588 * Compare @new_gscr against @dev and determine whether @dev is589 * the PMP described by @new_gscr.590 *591 * LOCKING:592 * None.593 *594 * RETURNS:595 * 1 if @dev matches @new_gscr, 0 otherwise.596 */597static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr)598{599 const u32 *old_gscr = dev->gscr;600 u16 old_vendor, new_vendor, old_devid, new_devid;601 int old_nr_ports, new_nr_ports;602 603 old_vendor = sata_pmp_gscr_vendor(old_gscr);604 new_vendor = sata_pmp_gscr_vendor(new_gscr);605 old_devid = sata_pmp_gscr_devid(old_gscr);606 new_devid = sata_pmp_gscr_devid(new_gscr);607 old_nr_ports = sata_pmp_gscr_ports(old_gscr);608 new_nr_ports = sata_pmp_gscr_ports(new_gscr);609 610 if (old_vendor != new_vendor) {611 ata_dev_info(dev,612 "Port Multiplier vendor mismatch '0x%x' != '0x%x'\n",613 old_vendor, new_vendor);614 return 0;615 }616 617 if (old_devid != new_devid) {618 ata_dev_info(dev,619 "Port Multiplier device ID mismatch '0x%x' != '0x%x'\n",620 old_devid, new_devid);621 return 0;622 }623 624 if (old_nr_ports != new_nr_ports) {625 ata_dev_info(dev,626 "Port Multiplier nr_ports mismatch '0x%x' != '0x%x'\n",627 old_nr_ports, new_nr_ports);628 return 0;629 }630 631 return 1;632}633 634/**635 * sata_pmp_revalidate - revalidate SATA PMP636 * @dev: PMP device to revalidate637 * @new_class: new class code638 *639 * Re-read GSCR block and make sure @dev is still attached to the640 * port and properly configured.641 *642 * LOCKING:643 * Kernel thread context (may sleep).644 *645 * RETURNS:646 * 0 on success, -errno otherwise.647 */648static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class)649{650 struct ata_link *link = dev->link;651 u32 *gscr = (void *)dev->sector_buf;652 int rc;653 654 ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE);655 656 if (!ata_dev_enabled(dev)) {657 rc = -ENODEV;658 goto fail;659 }660 661 /* wrong class? */662 if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) {663 rc = -ENODEV;664 goto fail;665 }666 667 /* read GSCR */668 rc = sata_pmp_read_gscr(dev, gscr);669 if (rc)670 goto fail;671 672 /* is the pmp still there? */673 if (!sata_pmp_same_pmp(dev, gscr)) {674 rc = -ENODEV;675 goto fail;676 }677 678 memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS);679 680 rc = sata_pmp_configure(dev, 0);681 if (rc)682 goto fail;683 684 ata_eh_done(link, NULL, ATA_EH_REVALIDATE);685 686 return 0;687 688 fail:689 ata_dev_err(dev, "PMP revalidation failed (errno=%d)\n", rc);690 return rc;691}692 693/**694 * sata_pmp_revalidate_quick - revalidate SATA PMP quickly695 * @dev: PMP device to revalidate696 *697 * Make sure the attached PMP is accessible.698 *699 * LOCKING:700 * Kernel thread context (may sleep).701 *702 * RETURNS:703 * 0 on success, -errno otherwise.704 */705static int sata_pmp_revalidate_quick(struct ata_device *dev)706{707 unsigned int err_mask;708 u32 prod_id;709 710 err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id);711 if (err_mask) {712 ata_dev_err(dev,713 "failed to read PMP product ID (Emask=0x%x)\n",714 err_mask);715 return -EIO;716 }717 718 if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) {719 ata_dev_err(dev, "PMP product ID mismatch\n");720 /* something weird is going on, request full PMP recovery */721 return -EIO;722 }723 724 return 0;725}726 727/**728 * sata_pmp_eh_recover_pmp - recover PMP729 * @ap: ATA port PMP is attached to730 * @prereset: prereset method (can be NULL)731 * @softreset: softreset method732 * @hardreset: hardreset method733 * @postreset: postreset method (can be NULL)734 *735 * Recover PMP attached to @ap. Recovery procedure is somewhat736 * similar to that of ata_eh_recover() except that reset should737 * always be performed in hard->soft sequence and recovery738 * failure results in PMP detachment.739 *740 * LOCKING:741 * Kernel thread context (may sleep).742 *743 * RETURNS:744 * 0 on success, -errno on failure.745 */746static int sata_pmp_eh_recover_pmp(struct ata_port *ap,747 ata_prereset_fn_t prereset, ata_reset_fn_t softreset,748 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)749{750 struct ata_link *link = &ap->link;751 struct ata_eh_context *ehc = &link->eh_context;752 struct ata_device *dev = link->device;753 int tries = ATA_EH_PMP_TRIES;754 int detach = 0, rc = 0;755 int reval_failed = 0;756 757 if (dev->flags & ATA_DFLAG_DETACH) {758 detach = 1;759 rc = -ENODEV;760 goto fail;761 }762 763 retry:764 ehc->classes[0] = ATA_DEV_UNKNOWN;765 766 if (ehc->i.action & ATA_EH_RESET) {767 struct ata_link *tlink;768 769 /* reset */770 rc = ata_eh_reset(link, 0, prereset, softreset, hardreset,771 postreset);772 if (rc) {773 ata_link_err(link, "failed to reset PMP, giving up\n");774 goto fail;775 }776 777 /* PMP is reset, SErrors cannot be trusted, scan all */778 ata_for_each_link(tlink, ap, EDGE) {779 struct ata_eh_context *ehc = &tlink->eh_context;780 781 ehc->i.probe_mask |= ATA_ALL_DEVICES;782 ehc->i.action |= ATA_EH_RESET;783 }784 }785 786 /* If revalidation is requested, revalidate and reconfigure;787 * otherwise, do quick revalidation.788 */789 if (ehc->i.action & ATA_EH_REVALIDATE)790 rc = sata_pmp_revalidate(dev, ehc->classes[0]);791 else792 rc = sata_pmp_revalidate_quick(dev);793 794 if (rc) {795 tries--;796 797 if (rc == -ENODEV) {798 ehc->i.probe_mask |= ATA_ALL_DEVICES;799 detach = 1;800 /* give it just two more chances */801 tries = min(tries, 2);802 }803 804 if (tries) {805 /* consecutive revalidation failures? speed down */806 if (reval_failed)807 sata_down_spd_limit(link, 0);808 else809 reval_failed = 1;810 811 ehc->i.action |= ATA_EH_RESET;812 goto retry;813 } else {814 ata_dev_err(dev,815 "failed to recover PMP after %d tries, giving up\n",816 ATA_EH_PMP_TRIES);817 goto fail;818 }819 }820 821 /* okay, PMP resurrected */822 ehc->i.flags = 0;823 824 return 0;825 826 fail:827 sata_pmp_detach(dev);828 if (detach)829 ata_eh_detach_dev(dev);830 else831 ata_dev_disable(dev);832 833 return rc;834}835 836static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap)837{838 struct ata_link *link;839 unsigned long flags;840 int rc;841 842 spin_lock_irqsave(ap->lock, flags);843 844 ata_for_each_link(link, ap, EDGE) {845 if (!(link->flags & ATA_LFLAG_DISABLED))846 continue;847 848 spin_unlock_irqrestore(ap->lock, flags);849 850 /* Some PMPs require hardreset sequence to get851 * SError.N working.852 */853 sata_link_hardreset(link, sata_deb_timing_normal,854 ata_deadline(jiffies, ATA_TMOUT_INTERNAL_QUICK),855 NULL, NULL);856 857 /* unconditionally clear SError.N */858 rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);859 if (rc) {860 ata_link_err(link,861 "failed to clear SError.N (errno=%d)\n",862 rc);863 return rc;864 }865 866 spin_lock_irqsave(ap->lock, flags);867 }868 869 spin_unlock_irqrestore(ap->lock, flags);870 871 return 0;872}873 874static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries)875{876 struct ata_port *ap = link->ap;877 unsigned long flags;878 879 if (link_tries[link->pmp] && --link_tries[link->pmp])880 return 1;881 882 /* disable this link */883 if (!(link->flags & ATA_LFLAG_DISABLED)) {884 ata_link_warn(link,885 "failed to recover link after %d tries, disabling\n",886 ATA_EH_PMP_LINK_TRIES);887 888 spin_lock_irqsave(ap->lock, flags);889 link->flags |= ATA_LFLAG_DISABLED;890 spin_unlock_irqrestore(ap->lock, flags);891 }892 893 ata_dev_disable(link->device);894 link->eh_context.i.action = 0;895 896 return 0;897}898 899/**900 * sata_pmp_eh_recover - recover PMP-enabled port901 * @ap: ATA port to recover902 *903 * Drive EH recovery operation for PMP enabled port @ap. This904 * function recovers host and PMP ports with proper retrials and905 * fallbacks. Actual recovery operations are performed using906 * ata_eh_recover() and sata_pmp_eh_recover_pmp().907 *908 * LOCKING:909 * Kernel thread context (may sleep).910 *911 * RETURNS:912 * 0 on success, -errno on failure.913 */914static int sata_pmp_eh_recover(struct ata_port *ap)915{916 struct ata_port_operations *ops = ap->ops;917 int pmp_tries, link_tries[SATA_PMP_MAX_PORTS];918 struct ata_link *pmp_link = &ap->link;919 struct ata_device *pmp_dev = pmp_link->device;920 struct ata_eh_context *pmp_ehc = &pmp_link->eh_context;921 u32 *gscr = pmp_dev->gscr;922 struct ata_link *link;923 struct ata_device *dev;924 unsigned int err_mask;925 u32 gscr_error, sntf;926 int cnt, rc;927 928 pmp_tries = ATA_EH_PMP_TRIES;929 ata_for_each_link(link, ap, EDGE)930 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;931 932 retry:933 /* PMP attached? */934 if (!sata_pmp_attached(ap)) {935 rc = ata_eh_recover(ap, ops->prereset, ops->softreset,936 ops->hardreset, ops->postreset, NULL);937 if (rc) {938 ata_for_each_dev(dev, &ap->link, ALL)939 ata_dev_disable(dev);940 return rc;941 }942 943 if (pmp_dev->class != ATA_DEV_PMP)944 return 0;945 946 /* new PMP online */947 ata_for_each_link(link, ap, EDGE)948 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;949 950 /* fall through */951 }952 953 /* recover pmp */954 rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset,955 ops->hardreset, ops->postreset);956 if (rc)957 goto pmp_fail;958 959 /* PHY event notification can disturb reset and other recovery960 * operations. Turn it off.961 */962 if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) {963 gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY;964 965 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN,966 gscr[SATA_PMP_GSCR_FEAT_EN]);967 if (err_mask) {968 ata_link_warn(pmp_link,969 "failed to disable NOTIFY (err_mask=0x%x)\n",970 err_mask);971 goto pmp_fail;972 }973 }974 975 /* handle disabled links */976 rc = sata_pmp_eh_handle_disabled_links(ap);977 if (rc)978 goto pmp_fail;979 980 /* recover links */981 rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset,982 ops->pmp_hardreset, ops->pmp_postreset, &link);983 if (rc)984 goto link_fail;985 986 /* clear SNotification */987 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);988 if (rc == 0)989 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);990 991 /*992 * If LPM is active on any fan-out port, hotplug wouldn't993 * work. Return w/ PHY event notification disabled.994 */995 ata_for_each_link(link, ap, EDGE)996 if (link->lpm_policy > ATA_LPM_MAX_POWER)997 return 0;998 999 /*1000 * Connection status might have changed while resetting other1001 * links, enable notification and check SATA_PMP_GSCR_ERROR1002 * before returning.1003 */1004 1005 /* enable notification */1006 if (pmp_dev->flags & ATA_DFLAG_AN) {1007 gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY;1008 1009 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN,1010 gscr[SATA_PMP_GSCR_FEAT_EN]);1011 if (err_mask) {1012 ata_dev_err(pmp_dev,1013 "failed to write PMP_FEAT_EN (Emask=0x%x)\n",1014 err_mask);1015 rc = -EIO;1016 goto pmp_fail;1017 }1018 }1019 1020 /* check GSCR_ERROR */1021 err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error);1022 if (err_mask) {1023 ata_dev_err(pmp_dev,1024 "failed to read PMP_GSCR_ERROR (Emask=0x%x)\n",1025 err_mask);1026 rc = -EIO;1027 goto pmp_fail;1028 }1029 1030 cnt = 0;1031 ata_for_each_link(link, ap, EDGE) {1032 if (!(gscr_error & (1 << link->pmp)))1033 continue;1034 1035 if (sata_pmp_handle_link_fail(link, link_tries)) {1036 ata_ehi_hotplugged(&link->eh_context.i);1037 cnt++;1038 } else {1039 ata_link_warn(link,1040 "PHY status changed but maxed out on retries, giving up\n");1041 ata_link_warn(link,1042 "Manually issue scan to resume this link\n");1043 }1044 }1045 1046 if (cnt) {1047 ata_port_info(ap,1048 "PMP SError.N set for some ports, repeating recovery\n");1049 goto retry;1050 }1051 1052 return 0;1053 1054 link_fail:1055 if (sata_pmp_handle_link_fail(link, link_tries)) {1056 pmp_ehc->i.action |= ATA_EH_RESET;1057 goto retry;1058 }1059 1060 /* fall through */1061 pmp_fail:1062 /* Control always ends up here after detaching PMP. Shut up1063 * and return if we're unloading.1064 */1065 if (ap->pflags & ATA_PFLAG_UNLOADING)1066 return rc;1067 1068 if (!sata_pmp_attached(ap))1069 goto retry;1070 1071 if (--pmp_tries) {1072 pmp_ehc->i.action |= ATA_EH_RESET;1073 goto retry;1074 }1075 1076 ata_port_err(ap, "failed to recover PMP after %d tries, giving up\n",1077 ATA_EH_PMP_TRIES);1078 sata_pmp_detach(pmp_dev);1079 ata_dev_disable(pmp_dev);1080 1081 return rc;1082}1083 1084/**1085 * sata_pmp_error_handler - do standard error handling for PMP-enabled host1086 * @ap: host port to handle error for1087 *1088 * Perform standard error handling sequence for PMP-enabled host1089 * @ap.1090 *1091 * LOCKING:1092 * Kernel thread context (may sleep).1093 */1094void sata_pmp_error_handler(struct ata_port *ap)1095{1096 ata_eh_autopsy(ap);1097 ata_eh_report(ap);1098 sata_pmp_eh_recover(ap);1099 ata_eh_finish(ap);1100}1101 1102EXPORT_SYMBOL_GPL(sata_pmp_port_ops);1103EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch);1104EXPORT_SYMBOL_GPL(sata_pmp_error_handler);1105