libata-pmp.c 26 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * libata-pmp.c - libata port multiplier support
  4. *
  5. * Copyright (c) 2007 SUSE Linux Products GmbH
  6. * Copyright (c) 2007 Tejun Heo <teheo@suse.de>
  7. */
  8. #include <linux/kernel.h>
  9. #include <linux/export.h>
  10. #include <linux/libata.h>
  11. #include <linux/slab.h>
  12. #include "libata.h"
  13. #include "libata-transport.h"
  14. const struct ata_port_operations sata_pmp_port_ops = {
  15. .inherits = &sata_port_ops,
  16. .pmp_prereset = ata_std_prereset,
  17. .pmp_hardreset = sata_std_hardreset,
  18. .pmp_postreset = ata_std_postreset,
  19. .error_handler = sata_pmp_error_handler,
  20. };
  21. /**
  22. * sata_pmp_read - read PMP register
  23. * @link: link to read PMP register for
  24. * @reg: register to read
  25. * @r_val: resulting value
  26. *
  27. * Read PMP register.
  28. *
  29. * LOCKING:
  30. * Kernel thread context (may sleep).
  31. *
  32. * RETURNS:
  33. * 0 on success, AC_ERR_* mask on failure.
  34. */
  35. static unsigned int sata_pmp_read(struct ata_link *link, int reg, u32 *r_val)
  36. {
  37. struct ata_port *ap = link->ap;
  38. struct ata_device *pmp_dev = ap->link.device;
  39. struct ata_taskfile tf;
  40. unsigned int err_mask;
  41. ata_tf_init(pmp_dev, &tf);
  42. tf.command = ATA_CMD_PMP_READ;
  43. tf.protocol = ATA_PROT_NODATA;
  44. tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
  45. tf.feature = reg;
  46. tf.device = link->pmp;
  47. err_mask = ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0,
  48. SATA_PMP_RW_TIMEOUT);
  49. if (err_mask)
  50. return err_mask;
  51. *r_val = tf.nsect | tf.lbal << 8 | tf.lbam << 16 | tf.lbah << 24;
  52. return 0;
  53. }
  54. /**
  55. * sata_pmp_write - write PMP register
  56. * @link: link to write PMP register for
  57. * @reg: register to write
  58. * @r_val: value to write
  59. *
  60. * Write PMP register.
  61. *
  62. * LOCKING:
  63. * Kernel thread context (may sleep).
  64. *
  65. * RETURNS:
  66. * 0 on success, AC_ERR_* mask on failure.
  67. */
  68. static unsigned int sata_pmp_write(struct ata_link *link, int reg, u32 val)
  69. {
  70. struct ata_port *ap = link->ap;
  71. struct ata_device *pmp_dev = ap->link.device;
  72. struct ata_taskfile tf;
  73. ata_tf_init(pmp_dev, &tf);
  74. tf.command = ATA_CMD_PMP_WRITE;
  75. tf.protocol = ATA_PROT_NODATA;
  76. tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
  77. tf.feature = reg;
  78. tf.device = link->pmp;
  79. tf.nsect = val & 0xff;
  80. tf.lbal = (val >> 8) & 0xff;
  81. tf.lbam = (val >> 16) & 0xff;
  82. tf.lbah = (val >> 24) & 0xff;
  83. return ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0,
  84. SATA_PMP_RW_TIMEOUT);
  85. }
  86. /**
  87. * sata_pmp_qc_defer_cmd_switch - qc_defer for command switching PMP
  88. * @qc: ATA command in question
  89. *
  90. * A host which has command switching PMP support cannot issue
  91. * commands to multiple links simultaneously.
  92. *
  93. * LOCKING:
  94. * spin_lock_irqsave(host lock)
  95. *
  96. * RETURNS:
  97. * ATA_DEFER_* if deferring is needed, 0 otherwise.
  98. */
  99. int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc)
  100. {
  101. struct ata_link *link = qc->dev->link;
  102. struct ata_port *ap = link->ap;
  103. if (ap->excl_link == NULL || ap->excl_link == link) {
  104. if (ap->nr_active_links == 0 || ata_link_active(link)) {
  105. qc->flags |= ATA_QCFLAG_CLEAR_EXCL;
  106. return ata_std_qc_defer(qc);
  107. }
  108. ap->excl_link = link;
  109. }
  110. return ATA_DEFER_PORT;
  111. }
  112. /**
  113. * sata_pmp_scr_read - read PSCR
  114. * @link: ATA link to read PSCR for
  115. * @reg: PSCR to read
  116. * @r_val: resulting value
  117. *
  118. * Read PSCR @reg into @r_val for @link, to be called from
  119. * ata_scr_read().
  120. *
  121. * LOCKING:
  122. * Kernel thread context (may sleep).
  123. *
  124. * RETURNS:
  125. * 0 on success, -errno on failure.
  126. */
  127. int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val)
  128. {
  129. unsigned int err_mask;
  130. if (reg > SATA_PMP_PSCR_CONTROL)
  131. return -EINVAL;
  132. err_mask = sata_pmp_read(link, reg, r_val);
  133. if (err_mask) {
  134. ata_link_warn(link, "failed to read SCR %d (Emask=0x%x)\n",
  135. reg, err_mask);
  136. return -EIO;
  137. }
  138. return 0;
  139. }
  140. /**
  141. * sata_pmp_scr_write - write PSCR
  142. * @link: ATA link to write PSCR for
  143. * @reg: PSCR to write
  144. * @val: value to be written
  145. *
  146. * Write @val to PSCR @reg for @link, to be called from
  147. * ata_scr_write() and ata_scr_write_flush().
  148. *
  149. * LOCKING:
  150. * Kernel thread context (may sleep).
  151. *
  152. * RETURNS:
  153. * 0 on success, -errno on failure.
  154. */
  155. int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val)
  156. {
  157. unsigned int err_mask;
  158. if (reg > SATA_PMP_PSCR_CONTROL)
  159. return -EINVAL;
  160. err_mask = sata_pmp_write(link, reg, val);
  161. if (err_mask) {
  162. ata_link_warn(link, "failed to write SCR %d (Emask=0x%x)\n",
  163. reg, err_mask);
  164. return -EIO;
  165. }
  166. return 0;
  167. }
  168. /**
  169. * sata_pmp_set_lpm - configure LPM for a PMP link
  170. * @link: PMP link to configure LPM for
  171. * @policy: target LPM policy
  172. * @hints: LPM hints
  173. *
  174. * Configure LPM for @link. This function will contain any PMP
  175. * specific workarounds if necessary.
  176. *
  177. * LOCKING:
  178. * EH context.
  179. *
  180. * RETURNS:
  181. * 0 on success, -errno on failure.
  182. */
  183. int sata_pmp_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
  184. unsigned hints)
  185. {
  186. return sata_link_scr_lpm(link, policy, true);
  187. }
  188. /**
  189. * sata_pmp_read_gscr - read GSCR block of SATA PMP
  190. * @dev: PMP device
  191. * @gscr: buffer to read GSCR block into
  192. *
  193. * Read selected PMP GSCRs from the PMP at @dev. This will serve
  194. * as configuration and identification info for the PMP.
  195. *
  196. * LOCKING:
  197. * Kernel thread context (may sleep).
  198. *
  199. * RETURNS:
  200. * 0 on success, -errno on failure.
  201. */
  202. static int sata_pmp_read_gscr(struct ata_device *dev, u32 *gscr)
  203. {
  204. static const int gscr_to_read[] = { 0, 1, 2, 32, 33, 64, 96 };
  205. int i;
  206. for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) {
  207. int reg = gscr_to_read[i];
  208. unsigned int err_mask;
  209. err_mask = sata_pmp_read(dev->link, reg, &gscr[reg]);
  210. if (err_mask) {
  211. ata_dev_err(dev, "failed to read PMP GSCR[%d] (Emask=0x%x)\n",
  212. reg, err_mask);
  213. return -EIO;
  214. }
  215. }
  216. return 0;
  217. }
  218. static const char *sata_pmp_spec_rev_str(const u32 *gscr)
  219. {
  220. u32 rev = gscr[SATA_PMP_GSCR_REV];
  221. if (rev & (1 << 3))
  222. return "1.2";
  223. if (rev & (1 << 2))
  224. return "1.1";
  225. if (rev & (1 << 1))
  226. return "1.0";
  227. return "<unknown>";
  228. }
  229. #define PMP_GSCR_SII_POL 129
  230. static int sata_pmp_configure(struct ata_device *dev, int print_info)
  231. {
  232. struct ata_port *ap = dev->link->ap;
  233. u32 *gscr = dev->gscr;
  234. u16 vendor = sata_pmp_gscr_vendor(gscr);
  235. u16 devid = sata_pmp_gscr_devid(gscr);
  236. unsigned int err_mask = 0;
  237. const char *reason;
  238. int nr_ports, rc;
  239. nr_ports = sata_pmp_gscr_ports(gscr);
  240. if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) {
  241. rc = -EINVAL;
  242. reason = "invalid nr_ports";
  243. goto fail;
  244. }
  245. if ((ap->flags & ATA_FLAG_AN) &&
  246. (gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY))
  247. dev->flags |= ATA_DFLAG_AN;
  248. /* monitor SERR_PHYRDY_CHG on fan-out ports */
  249. err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN,
  250. SERR_PHYRDY_CHG);
  251. if (err_mask) {
  252. rc = -EIO;
  253. reason = "failed to write GSCR_ERROR_EN";
  254. goto fail;
  255. }
  256. /* Disable sending Early R_OK.
  257. * With "cached read" HDD testing and multiple ports busy on a SATA
  258. * host controller, 3x26 PMP will very rarely drop a deferred
  259. * R_OK that was intended for the host. Symptom will be all
  260. * 5 drives under test will timeout, get reset, and recover.
  261. */
  262. if (vendor == 0x1095 && (devid == 0x3726 || devid == 0x3826)) {
  263. u32 reg;
  264. err_mask = sata_pmp_read(&ap->link, PMP_GSCR_SII_POL, &reg);
  265. if (err_mask) {
  266. rc = -EIO;
  267. reason = "failed to read Sil3x26 Private Register";
  268. goto fail;
  269. }
  270. reg &= ~0x1;
  271. err_mask = sata_pmp_write(&ap->link, PMP_GSCR_SII_POL, reg);
  272. if (err_mask) {
  273. rc = -EIO;
  274. reason = "failed to write Sil3x26 Private Register";
  275. goto fail;
  276. }
  277. }
  278. if (print_info) {
  279. ata_dev_info(dev, "Port Multiplier %s, "
  280. "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n",
  281. sata_pmp_spec_rev_str(gscr), vendor, devid,
  282. sata_pmp_gscr_rev(gscr),
  283. nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN],
  284. gscr[SATA_PMP_GSCR_FEAT]);
  285. if (!(dev->flags & ATA_DFLAG_AN))
  286. ata_dev_info(dev,
  287. "Asynchronous notification not supported, "
  288. "hotplug won't work on fan-out ports. Use warm-plug instead.\n");
  289. }
  290. return 0;
  291. fail:
  292. ata_dev_err(dev,
  293. "failed to configure Port Multiplier (%s, Emask=0x%x)\n",
  294. reason, err_mask);
  295. return rc;
  296. }
  297. static int sata_pmp_init_links (struct ata_port *ap, int nr_ports)
  298. {
  299. struct ata_link *pmp_link = ap->pmp_link;
  300. int i, err;
  301. if (!pmp_link) {
  302. pmp_link = kcalloc(SATA_PMP_MAX_PORTS, sizeof(pmp_link[0]),
  303. GFP_NOIO);
  304. if (!pmp_link)
  305. return -ENOMEM;
  306. for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
  307. ata_link_init(ap, &pmp_link[i], i);
  308. ap->pmp_link = pmp_link;
  309. for (i = 0; i < SATA_PMP_MAX_PORTS; i++) {
  310. err = ata_tlink_add(&pmp_link[i]);
  311. if (err) {
  312. goto err_tlink;
  313. }
  314. }
  315. }
  316. for (i = 0; i < nr_ports; i++) {
  317. struct ata_link *link = &pmp_link[i];
  318. struct ata_eh_context *ehc = &link->eh_context;
  319. link->flags = 0;
  320. ehc->i.probe_mask |= ATA_ALL_DEVICES;
  321. ehc->i.action |= ATA_EH_RESET;
  322. }
  323. return 0;
  324. err_tlink:
  325. while (--i >= 0)
  326. ata_tlink_delete(&pmp_link[i]);
  327. kfree(pmp_link);
  328. ap->pmp_link = NULL;
  329. return err;
  330. }
  331. static void sata_pmp_quirks(struct ata_port *ap)
  332. {
  333. u32 *gscr = ap->link.device->gscr;
  334. u16 vendor = sata_pmp_gscr_vendor(gscr);
  335. u16 devid = sata_pmp_gscr_devid(gscr);
  336. struct ata_link *link;
  337. if (vendor == 0x1095 && (devid == 0x3726 || devid == 0x3826)) {
  338. /* sil3x26 quirks */
  339. ata_for_each_link(link, ap, EDGE) {
  340. /* link reports offline after LPM */
  341. link->flags |= ATA_LFLAG_NO_LPM;
  342. /*
  343. * Class code report is unreliable and SRST times
  344. * out under certain configurations.
  345. */
  346. if (link->pmp < 5)
  347. link->flags |= ATA_LFLAG_NO_SRST |
  348. ATA_LFLAG_ASSUME_ATA;
  349. /* port 5 is for SEMB device and it doesn't like SRST */
  350. if (link->pmp == 5)
  351. link->flags |= ATA_LFLAG_NO_SRST |
  352. ATA_LFLAG_ASSUME_SEMB;
  353. }
  354. } else if (vendor == 0x1095 && devid == 0x4723) {
  355. /*
  356. * sil4723 quirks
  357. *
  358. * Link reports offline after LPM. Class code report is
  359. * unreliable. SIMG PMPs never got SRST reliable and the
  360. * config device at port 2 locks up on SRST.
  361. */
  362. ata_for_each_link(link, ap, EDGE)
  363. link->flags |= ATA_LFLAG_NO_LPM |
  364. ATA_LFLAG_NO_SRST |
  365. ATA_LFLAG_ASSUME_ATA;
  366. } else if (vendor == 0x1095 && devid == 0x4726) {
  367. /* sil4726 quirks */
  368. ata_for_each_link(link, ap, EDGE) {
  369. /* link reports offline after LPM */
  370. link->flags |= ATA_LFLAG_NO_LPM;
  371. /* Class code report is unreliable and SRST
  372. * times out under certain configurations.
  373. * Config device can be at port 0 or 5 and
  374. * locks up on SRST.
  375. */
  376. if (link->pmp <= 5)
  377. link->flags |= ATA_LFLAG_NO_SRST |
  378. ATA_LFLAG_ASSUME_ATA;
  379. /* Port 6 is for SEMB device which doesn't
  380. * like SRST either.
  381. */
  382. if (link->pmp == 6)
  383. link->flags |= ATA_LFLAG_NO_SRST |
  384. ATA_LFLAG_ASSUME_SEMB;
  385. }
  386. } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 ||
  387. devid == 0x5734 || devid == 0x5744)) {
  388. /* sil5723/5744 quirks */
  389. /* sil5723/5744 has either two or three downstream
  390. * ports depending on operation mode. The last port
  391. * is empty if any actual IO device is available or
  392. * occupied by a pseudo configuration device
  393. * otherwise. Don't try hard to recover it.
  394. */
  395. ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY;
  396. } else if (vendor == 0x197b && (devid == 0x2352 || devid == 0x0325)) {
  397. /*
  398. * 0x2352: found in Thermaltake BlackX Duet, jmicron JMB350?
  399. * 0x0325: jmicron JMB394.
  400. */
  401. ata_for_each_link(link, ap, EDGE) {
  402. /* SRST breaks detection and disks get misclassified
  403. * LPM disabled to avoid potential problems
  404. */
  405. link->flags |= ATA_LFLAG_NO_LPM |
  406. ATA_LFLAG_NO_SRST |
  407. ATA_LFLAG_ASSUME_ATA;
  408. }
  409. } else if (vendor == 0x11ab && devid == 0x4140) {
  410. /* Marvell 4140 quirks */
  411. ata_for_each_link(link, ap, EDGE) {
  412. /* port 4 is for SEMB device and it doesn't like SRST */
  413. if (link->pmp == 4)
  414. link->flags |= ATA_LFLAG_DISABLED;
  415. }
  416. }
  417. }
  418. /**
  419. * sata_pmp_attach - attach a SATA PMP device
  420. * @dev: SATA PMP device to attach
  421. *
  422. * Configure and attach SATA PMP device @dev. This function is
  423. * also responsible for allocating and initializing PMP links.
  424. *
  425. * LOCKING:
  426. * Kernel thread context (may sleep).
  427. *
  428. * RETURNS:
  429. * 0 on success, -errno on failure.
  430. */
  431. int sata_pmp_attach(struct ata_device *dev)
  432. {
  433. struct ata_link *link = dev->link;
  434. struct ata_port *ap = link->ap;
  435. unsigned long flags;
  436. struct ata_link *tlink;
  437. int rc;
  438. /* is it hanging off the right place? */
  439. if (!sata_pmp_supported(ap)) {
  440. ata_dev_err(dev, "host does not support Port Multiplier\n");
  441. return -EINVAL;
  442. }
  443. if (!ata_is_host_link(link)) {
  444. ata_dev_err(dev, "Port Multipliers cannot be nested\n");
  445. return -EINVAL;
  446. }
  447. if (dev->devno) {
  448. ata_dev_err(dev, "Port Multiplier must be the first device\n");
  449. return -EINVAL;
  450. }
  451. WARN_ON(link->pmp != 0);
  452. link->pmp = SATA_PMP_CTRL_PORT;
  453. /* read GSCR block */
  454. rc = sata_pmp_read_gscr(dev, dev->gscr);
  455. if (rc)
  456. goto fail;
  457. /* config PMP */
  458. rc = sata_pmp_configure(dev, 1);
  459. if (rc)
  460. goto fail;
  461. rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr));
  462. if (rc) {
  463. ata_dev_info(dev, "failed to initialize PMP links\n");
  464. goto fail;
  465. }
  466. /* attach it */
  467. spin_lock_irqsave(ap->lock, flags);
  468. WARN_ON(ap->nr_pmp_links);
  469. ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr);
  470. spin_unlock_irqrestore(ap->lock, flags);
  471. sata_pmp_quirks(ap);
  472. if (ap->ops->pmp_attach)
  473. ap->ops->pmp_attach(ap);
  474. ata_for_each_link(tlink, ap, EDGE)
  475. sata_link_init_spd(tlink);
  476. return 0;
  477. fail:
  478. link->pmp = 0;
  479. return rc;
  480. }
  481. /**
  482. * sata_pmp_detach - detach a SATA PMP device
  483. * @dev: SATA PMP device to detach
  484. *
  485. * Detach SATA PMP device @dev. This function is also
  486. * responsible for deconfiguring PMP links.
  487. *
  488. * LOCKING:
  489. * Kernel thread context (may sleep).
  490. */
  491. static void sata_pmp_detach(struct ata_device *dev)
  492. {
  493. struct ata_link *link = dev->link;
  494. struct ata_port *ap = link->ap;
  495. struct ata_link *tlink;
  496. unsigned long flags;
  497. ata_dev_info(dev, "Port Multiplier detaching\n");
  498. WARN_ON(!ata_is_host_link(link) || dev->devno ||
  499. link->pmp != SATA_PMP_CTRL_PORT);
  500. if (ap->ops->pmp_detach)
  501. ap->ops->pmp_detach(ap);
  502. ata_for_each_link(tlink, ap, EDGE)
  503. ata_eh_detach_dev(tlink->device);
  504. spin_lock_irqsave(ap->lock, flags);
  505. ap->nr_pmp_links = 0;
  506. link->pmp = 0;
  507. spin_unlock_irqrestore(ap->lock, flags);
  508. }
  509. /**
  510. * sata_pmp_same_pmp - does new GSCR matches the configured PMP?
  511. * @dev: PMP device to compare against
  512. * @new_gscr: GSCR block of the new device
  513. *
  514. * Compare @new_gscr against @dev and determine whether @dev is
  515. * the PMP described by @new_gscr.
  516. *
  517. * LOCKING:
  518. * None.
  519. *
  520. * RETURNS:
  521. * 1 if @dev matches @new_gscr, 0 otherwise.
  522. */
  523. static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr)
  524. {
  525. const u32 *old_gscr = dev->gscr;
  526. u16 old_vendor, new_vendor, old_devid, new_devid;
  527. int old_nr_ports, new_nr_ports;
  528. old_vendor = sata_pmp_gscr_vendor(old_gscr);
  529. new_vendor = sata_pmp_gscr_vendor(new_gscr);
  530. old_devid = sata_pmp_gscr_devid(old_gscr);
  531. new_devid = sata_pmp_gscr_devid(new_gscr);
  532. old_nr_ports = sata_pmp_gscr_ports(old_gscr);
  533. new_nr_ports = sata_pmp_gscr_ports(new_gscr);
  534. if (old_vendor != new_vendor) {
  535. ata_dev_info(dev,
  536. "Port Multiplier vendor mismatch '0x%x' != '0x%x'\n",
  537. old_vendor, new_vendor);
  538. return 0;
  539. }
  540. if (old_devid != new_devid) {
  541. ata_dev_info(dev,
  542. "Port Multiplier device ID mismatch '0x%x' != '0x%x'\n",
  543. old_devid, new_devid);
  544. return 0;
  545. }
  546. if (old_nr_ports != new_nr_ports) {
  547. ata_dev_info(dev,
  548. "Port Multiplier nr_ports mismatch '0x%x' != '0x%x'\n",
  549. old_nr_ports, new_nr_ports);
  550. return 0;
  551. }
  552. return 1;
  553. }
  554. /**
  555. * sata_pmp_revalidate - revalidate SATA PMP
  556. * @dev: PMP device to revalidate
  557. * @new_class: new class code
  558. *
  559. * Re-read GSCR block and make sure @dev is still attached to the
  560. * port and properly configured.
  561. *
  562. * LOCKING:
  563. * Kernel thread context (may sleep).
  564. *
  565. * RETURNS:
  566. * 0 on success, -errno otherwise.
  567. */
  568. static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class)
  569. {
  570. struct ata_link *link = dev->link;
  571. struct ata_port *ap = link->ap;
  572. u32 *gscr = (void *)ap->sector_buf;
  573. int rc;
  574. DPRINTK("ENTER\n");
  575. ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE);
  576. if (!ata_dev_enabled(dev)) {
  577. rc = -ENODEV;
  578. goto fail;
  579. }
  580. /* wrong class? */
  581. if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) {
  582. rc = -ENODEV;
  583. goto fail;
  584. }
  585. /* read GSCR */
  586. rc = sata_pmp_read_gscr(dev, gscr);
  587. if (rc)
  588. goto fail;
  589. /* is the pmp still there? */
  590. if (!sata_pmp_same_pmp(dev, gscr)) {
  591. rc = -ENODEV;
  592. goto fail;
  593. }
  594. memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS);
  595. rc = sata_pmp_configure(dev, 0);
  596. if (rc)
  597. goto fail;
  598. ata_eh_done(link, NULL, ATA_EH_REVALIDATE);
  599. DPRINTK("EXIT, rc=0\n");
  600. return 0;
  601. fail:
  602. ata_dev_err(dev, "PMP revalidation failed (errno=%d)\n", rc);
  603. DPRINTK("EXIT, rc=%d\n", rc);
  604. return rc;
  605. }
  606. /**
  607. * sata_pmp_revalidate_quick - revalidate SATA PMP quickly
  608. * @dev: PMP device to revalidate
  609. *
  610. * Make sure the attached PMP is accessible.
  611. *
  612. * LOCKING:
  613. * Kernel thread context (may sleep).
  614. *
  615. * RETURNS:
  616. * 0 on success, -errno otherwise.
  617. */
  618. static int sata_pmp_revalidate_quick(struct ata_device *dev)
  619. {
  620. unsigned int err_mask;
  621. u32 prod_id;
  622. err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id);
  623. if (err_mask) {
  624. ata_dev_err(dev,
  625. "failed to read PMP product ID (Emask=0x%x)\n",
  626. err_mask);
  627. return -EIO;
  628. }
  629. if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) {
  630. ata_dev_err(dev, "PMP product ID mismatch\n");
  631. /* something weird is going on, request full PMP recovery */
  632. return -EIO;
  633. }
  634. return 0;
  635. }
  636. /**
  637. * sata_pmp_eh_recover_pmp - recover PMP
  638. * @ap: ATA port PMP is attached to
  639. * @prereset: prereset method (can be NULL)
  640. * @softreset: softreset method
  641. * @hardreset: hardreset method
  642. * @postreset: postreset method (can be NULL)
  643. *
  644. * Recover PMP attached to @ap. Recovery procedure is somewhat
  645. * similar to that of ata_eh_recover() except that reset should
  646. * always be performed in hard->soft sequence and recovery
  647. * failure results in PMP detachment.
  648. *
  649. * LOCKING:
  650. * Kernel thread context (may sleep).
  651. *
  652. * RETURNS:
  653. * 0 on success, -errno on failure.
  654. */
  655. static int sata_pmp_eh_recover_pmp(struct ata_port *ap,
  656. ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
  657. ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
  658. {
  659. struct ata_link *link = &ap->link;
  660. struct ata_eh_context *ehc = &link->eh_context;
  661. struct ata_device *dev = link->device;
  662. int tries = ATA_EH_PMP_TRIES;
  663. int detach = 0, rc = 0;
  664. int reval_failed = 0;
  665. DPRINTK("ENTER\n");
  666. if (dev->flags & ATA_DFLAG_DETACH) {
  667. detach = 1;
  668. rc = -ENODEV;
  669. goto fail;
  670. }
  671. retry:
  672. ehc->classes[0] = ATA_DEV_UNKNOWN;
  673. if (ehc->i.action & ATA_EH_RESET) {
  674. struct ata_link *tlink;
  675. /* reset */
  676. rc = ata_eh_reset(link, 0, prereset, softreset, hardreset,
  677. postreset);
  678. if (rc) {
  679. ata_link_err(link, "failed to reset PMP, giving up\n");
  680. goto fail;
  681. }
  682. /* PMP is reset, SErrors cannot be trusted, scan all */
  683. ata_for_each_link(tlink, ap, EDGE) {
  684. struct ata_eh_context *ehc = &tlink->eh_context;
  685. ehc->i.probe_mask |= ATA_ALL_DEVICES;
  686. ehc->i.action |= ATA_EH_RESET;
  687. }
  688. }
  689. /* If revalidation is requested, revalidate and reconfigure;
  690. * otherwise, do quick revalidation.
  691. */
  692. if (ehc->i.action & ATA_EH_REVALIDATE)
  693. rc = sata_pmp_revalidate(dev, ehc->classes[0]);
  694. else
  695. rc = sata_pmp_revalidate_quick(dev);
  696. if (rc) {
  697. tries--;
  698. if (rc == -ENODEV) {
  699. ehc->i.probe_mask |= ATA_ALL_DEVICES;
  700. detach = 1;
  701. /* give it just two more chances */
  702. tries = min(tries, 2);
  703. }
  704. if (tries) {
  705. /* consecutive revalidation failures? speed down */
  706. if (reval_failed)
  707. sata_down_spd_limit(link, 0);
  708. else
  709. reval_failed = 1;
  710. ehc->i.action |= ATA_EH_RESET;
  711. goto retry;
  712. } else {
  713. ata_dev_err(dev,
  714. "failed to recover PMP after %d tries, giving up\n",
  715. ATA_EH_PMP_TRIES);
  716. goto fail;
  717. }
  718. }
  719. /* okay, PMP resurrected */
  720. ehc->i.flags = 0;
  721. DPRINTK("EXIT, rc=0\n");
  722. return 0;
  723. fail:
  724. sata_pmp_detach(dev);
  725. if (detach)
  726. ata_eh_detach_dev(dev);
  727. else
  728. ata_dev_disable(dev);
  729. DPRINTK("EXIT, rc=%d\n", rc);
  730. return rc;
  731. }
  732. static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap)
  733. {
  734. struct ata_link *link;
  735. unsigned long flags;
  736. int rc;
  737. spin_lock_irqsave(ap->lock, flags);
  738. ata_for_each_link(link, ap, EDGE) {
  739. if (!(link->flags & ATA_LFLAG_DISABLED))
  740. continue;
  741. spin_unlock_irqrestore(ap->lock, flags);
  742. /* Some PMPs require hardreset sequence to get
  743. * SError.N working.
  744. */
  745. sata_link_hardreset(link, sata_deb_timing_normal,
  746. ata_deadline(jiffies, ATA_TMOUT_INTERNAL_QUICK),
  747. NULL, NULL);
  748. /* unconditionally clear SError.N */
  749. rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
  750. if (rc) {
  751. ata_link_err(link,
  752. "failed to clear SError.N (errno=%d)\n",
  753. rc);
  754. return rc;
  755. }
  756. spin_lock_irqsave(ap->lock, flags);
  757. }
  758. spin_unlock_irqrestore(ap->lock, flags);
  759. return 0;
  760. }
  761. static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries)
  762. {
  763. struct ata_port *ap = link->ap;
  764. unsigned long flags;
  765. if (link_tries[link->pmp] && --link_tries[link->pmp])
  766. return 1;
  767. /* disable this link */
  768. if (!(link->flags & ATA_LFLAG_DISABLED)) {
  769. ata_link_warn(link,
  770. "failed to recover link after %d tries, disabling\n",
  771. ATA_EH_PMP_LINK_TRIES);
  772. spin_lock_irqsave(ap->lock, flags);
  773. link->flags |= ATA_LFLAG_DISABLED;
  774. spin_unlock_irqrestore(ap->lock, flags);
  775. }
  776. ata_dev_disable(link->device);
  777. link->eh_context.i.action = 0;
  778. return 0;
  779. }
  780. /**
  781. * sata_pmp_eh_recover - recover PMP-enabled port
  782. * @ap: ATA port to recover
  783. *
  784. * Drive EH recovery operation for PMP enabled port @ap. This
  785. * function recovers host and PMP ports with proper retrials and
  786. * fallbacks. Actual recovery operations are performed using
  787. * ata_eh_recover() and sata_pmp_eh_recover_pmp().
  788. *
  789. * LOCKING:
  790. * Kernel thread context (may sleep).
  791. *
  792. * RETURNS:
  793. * 0 on success, -errno on failure.
  794. */
  795. static int sata_pmp_eh_recover(struct ata_port *ap)
  796. {
  797. struct ata_port_operations *ops = ap->ops;
  798. int pmp_tries, link_tries[SATA_PMP_MAX_PORTS];
  799. struct ata_link *pmp_link = &ap->link;
  800. struct ata_device *pmp_dev = pmp_link->device;
  801. struct ata_eh_context *pmp_ehc = &pmp_link->eh_context;
  802. u32 *gscr = pmp_dev->gscr;
  803. struct ata_link *link;
  804. struct ata_device *dev;
  805. unsigned int err_mask;
  806. u32 gscr_error, sntf;
  807. int cnt, rc;
  808. pmp_tries = ATA_EH_PMP_TRIES;
  809. ata_for_each_link(link, ap, EDGE)
  810. link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
  811. retry:
  812. /* PMP attached? */
  813. if (!sata_pmp_attached(ap)) {
  814. rc = ata_eh_recover(ap, ops->prereset, ops->softreset,
  815. ops->hardreset, ops->postreset, NULL);
  816. if (rc) {
  817. ata_for_each_dev(dev, &ap->link, ALL)
  818. ata_dev_disable(dev);
  819. return rc;
  820. }
  821. if (pmp_dev->class != ATA_DEV_PMP)
  822. return 0;
  823. /* new PMP online */
  824. ata_for_each_link(link, ap, EDGE)
  825. link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
  826. /* fall through */
  827. }
  828. /* recover pmp */
  829. rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset,
  830. ops->hardreset, ops->postreset);
  831. if (rc)
  832. goto pmp_fail;
  833. /* PHY event notification can disturb reset and other recovery
  834. * operations. Turn it off.
  835. */
  836. if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) {
  837. gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY;
  838. err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN,
  839. gscr[SATA_PMP_GSCR_FEAT_EN]);
  840. if (err_mask) {
  841. ata_link_warn(pmp_link,
  842. "failed to disable NOTIFY (err_mask=0x%x)\n",
  843. err_mask);
  844. goto pmp_fail;
  845. }
  846. }
  847. /* handle disabled links */
  848. rc = sata_pmp_eh_handle_disabled_links(ap);
  849. if (rc)
  850. goto pmp_fail;
  851. /* recover links */
  852. rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset,
  853. ops->pmp_hardreset, ops->pmp_postreset, &link);
  854. if (rc)
  855. goto link_fail;
  856. /* clear SNotification */
  857. rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
  858. if (rc == 0)
  859. sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
  860. /*
  861. * If LPM is active on any fan-out port, hotplug wouldn't
  862. * work. Return w/ PHY event notification disabled.
  863. */
  864. ata_for_each_link(link, ap, EDGE)
  865. if (link->lpm_policy > ATA_LPM_MAX_POWER)
  866. return 0;
  867. /*
  868. * Connection status might have changed while resetting other
  869. * links, enable notification and check SATA_PMP_GSCR_ERROR
  870. * before returning.
  871. */
  872. /* enable notification */
  873. if (pmp_dev->flags & ATA_DFLAG_AN) {
  874. gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY;
  875. err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN,
  876. gscr[SATA_PMP_GSCR_FEAT_EN]);
  877. if (err_mask) {
  878. ata_dev_err(pmp_dev,
  879. "failed to write PMP_FEAT_EN (Emask=0x%x)\n",
  880. err_mask);
  881. rc = -EIO;
  882. goto pmp_fail;
  883. }
  884. }
  885. /* check GSCR_ERROR */
  886. err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error);
  887. if (err_mask) {
  888. ata_dev_err(pmp_dev,
  889. "failed to read PMP_GSCR_ERROR (Emask=0x%x)\n",
  890. err_mask);
  891. rc = -EIO;
  892. goto pmp_fail;
  893. }
  894. cnt = 0;
  895. ata_for_each_link(link, ap, EDGE) {
  896. if (!(gscr_error & (1 << link->pmp)))
  897. continue;
  898. if (sata_pmp_handle_link_fail(link, link_tries)) {
  899. ata_ehi_hotplugged(&link->eh_context.i);
  900. cnt++;
  901. } else {
  902. ata_link_warn(link,
  903. "PHY status changed but maxed out on retries, giving up\n");
  904. ata_link_warn(link,
  905. "Manually issue scan to resume this link\n");
  906. }
  907. }
  908. if (cnt) {
  909. ata_port_info(ap,
  910. "PMP SError.N set for some ports, repeating recovery\n");
  911. goto retry;
  912. }
  913. return 0;
  914. link_fail:
  915. if (sata_pmp_handle_link_fail(link, link_tries)) {
  916. pmp_ehc->i.action |= ATA_EH_RESET;
  917. goto retry;
  918. }
  919. /* fall through */
  920. pmp_fail:
  921. /* Control always ends up here after detaching PMP. Shut up
  922. * and return if we're unloading.
  923. */
  924. if (ap->pflags & ATA_PFLAG_UNLOADING)
  925. return rc;
  926. if (!sata_pmp_attached(ap))
  927. goto retry;
  928. if (--pmp_tries) {
  929. pmp_ehc->i.action |= ATA_EH_RESET;
  930. goto retry;
  931. }
  932. ata_port_err(ap, "failed to recover PMP after %d tries, giving up\n",
  933. ATA_EH_PMP_TRIES);
  934. sata_pmp_detach(pmp_dev);
  935. ata_dev_disable(pmp_dev);
  936. return rc;
  937. }
  938. /**
  939. * sata_pmp_error_handler - do standard error handling for PMP-enabled host
  940. * @ap: host port to handle error for
  941. *
  942. * Perform standard error handling sequence for PMP-enabled host
  943. * @ap.
  944. *
  945. * LOCKING:
  946. * Kernel thread context (may sleep).
  947. */
  948. void sata_pmp_error_handler(struct ata_port *ap)
  949. {
  950. ata_eh_autopsy(ap);
  951. ata_eh_report(ap);
  952. sata_pmp_eh_recover(ap);
  953. ata_eh_finish(ap);
  954. }
  955. EXPORT_SYMBOL_GPL(sata_pmp_port_ops);
  956. EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch);
  957. EXPORT_SYMBOL_GPL(sata_pmp_error_handler);