| /* |
| * libata-pmp.c - libata port multiplier support |
| * |
| * Copyright (c) 2007 SUSE Linux Products GmbH |
| * Copyright (c) 2007 Tejun Heo <teheo@suse.de> |
| * |
| * This file is released under the GPLv2. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/libata.h> |
| #include <linux/slab.h> |
| #include "libata.h" |
| #include "libata-transport.h" |
| |
| const struct ata_port_operations sata_pmp_port_ops = { |
| .inherits = &sata_port_ops, |
| .pmp_prereset = ata_std_prereset, |
| .pmp_hardreset = sata_std_hardreset, |
| .pmp_postreset = ata_std_postreset, |
| .error_handler = sata_pmp_error_handler, |
| }; |
| |
| /** |
| * sata_pmp_read - read PMP register |
| * @link: link to read PMP register for |
| * @reg: register to read |
| * @r_val: resulting value |
| * |
| * Read PMP register. |
| * |
| * LOCKING: |
| * Kernel thread context (may sleep). |
| * |
| * RETURNS: |
| * 0 on success, AC_ERR_* mask on failure. |
| */ |
| static unsigned int sata_pmp_read(struct ata_link *link, int reg, u32 *r_val) |
| { |
| struct ata_port *ap = link->ap; |
| struct ata_device *pmp_dev = ap->link.device; |
| struct ata_taskfile tf; |
| unsigned int err_mask; |
| |
| ata_tf_init(pmp_dev, &tf); |
| tf.command = ATA_CMD_PMP_READ; |
| tf.protocol = ATA_PROT_NODATA; |
| tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; |
| tf.feature = reg; |
| tf.device = link->pmp; |
| |
| err_mask = ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0, |
| SATA_PMP_RW_TIMEOUT); |
| if (err_mask) |
| return err_mask; |
| |
| *r_val = tf.nsect | tf.lbal << 8 | tf.lbam << 16 | tf.lbah << 24; |
| return 0; |
| } |
| |
| /** |
| * sata_pmp_write - write PMP register |
| * @link: link to write PMP register for |
| * @reg: register to write |
| * @r_val: value to write |
| * |
| * Write PMP register. |
| * |
| * LOCKING: |
| * Kernel thread context (may sleep). |
| * |
| * RETURNS: |
| * 0 on success, AC_ERR_* mask on failure. |
| */ |
| static unsigned int sata_pmp_write(struct ata_link *link, int reg, u32 val) |
| { |
| struct ata_port *ap = link->ap; |
| struct ata_device *pmp_dev = ap->link.device; |
| struct ata_taskfile tf; |
| |
| ata_tf_init(pmp_dev, &tf); |
| tf.command = ATA_CMD_PMP_WRITE; |
| tf.protocol = ATA_PROT_NODATA; |
| tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; |
| tf.feature = reg; |
| tf.device = link->pmp; |
| tf.nsect = val & 0xff; |
| tf.lbal = (val >> 8) & 0xff; |
| tf.lbam = (val >> 16) & 0xff; |
| tf.lbah = (val >> 24) & 0xff; |
| |
| return ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0, |
| SATA_PMP_RW_TIMEOUT); |
| } |
| |
| /** |
| * sata_pmp_qc_defer_cmd_switch - qc_defer for command switching PMP |
| * @qc: ATA command in question |
| * |
| * A host which has command switching PMP support cannot issue |
| * commands to multiple links simultaneously. |
| * |
| * LOCKING: |
| * spin_lock_irqsave(host lock) |
| * |
| * RETURNS: |
| * ATA_DEFER_* if deferring is needed, 0 otherwise. |
| */ |
| int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc) |
| { |
| struct ata_link *link = qc->dev->link; |
| struct ata_port *ap = link->ap; |
| |
| if (ap->excl_link == NULL || ap->excl_link == link) { |
| if (ap->nr_active_links == 0 || ata_link_active(link)) { |
| qc->flags |= ATA_QCFLAG_CLEAR_EXCL; |
| return ata_std_qc_defer(qc); |
| } |
| |
| ap->excl_link = link; |
| } |
| |
| return ATA_DEFER_PORT; |
| } |
| |
| /** |
| * sata_pmp_scr_read - read PSCR |
| * @link: ATA link to read PSCR for |
| * @reg: PSCR to read |
| * @r_val: resulting value |
| * |
| * Read PSCR @reg into @r_val for @link, to be called from |
| * ata_scr_read(). |
| * |
| * LOCKING: |
| * Kernel thread context (may sleep). |
| * |
| * RETURNS: |
| * 0 on success, -errno on failure. |
| */ |
| int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val) |
| { |
| unsigned int err_mask; |
| |
| if (reg > SATA_PMP_PSCR_CONTROL) |
| return -EINVAL; |
| |
| err_mask = sata_pmp_read(link, reg, r_val); |
| if (err_mask) { |
| ata_link_printk(link, KERN_WARNING, "failed to read SCR %d " |
| "(Emask=0x%x)\n", reg, err_mask); |
| return -EIO; |
| } |
| return 0; |
| } |
| |
| /** |
| * sata_pmp_scr_write - write PSCR |
| * @link: ATA link to write PSCR for |
| * @reg: PSCR to write |
| * @val: value to be written |
| * |
| * Write @val to PSCR @reg for @link, to be called from |
| * ata_scr_write() and ata_scr_write_flush(). |
| * |
| * LOCKING: |
| * Kernel thread context (may sleep). |
| * |
| * RETURNS: |
| * 0 on success, -errno on failure. |
| */ |
| int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val) |
| { |
| unsigned int err_mask; |
| |
| if (reg > SATA_PMP_PSCR_CONTROL) |
| return -EINVAL; |
| |
| err_mask = sata_pmp_write(link, reg, val); |
| if (err_mask) { |
| ata_link_printk(link, KERN_WARNING, "failed to write SCR %d " |
| "(Emask=0x%x)\n", reg, err_mask); |
| return -EIO; |
| } |
| return 0; |
| } |
| |
| /** |
| * sata_pmp_set_lpm - configure LPM for a PMP link |
| * @link: PMP link to configure LPM for |
| * @policy: target LPM policy |
| * @hints: LPM hints |
| * |
| * Configure LPM for @link. This function will contain any PMP |
| * specific workarounds if necessary. |
| * |
| * LOCKING: |
| * EH context. |
| * |
| * RETURNS: |
| * 0 on success, -errno on failure. |
| */ |
| int sata_pmp_set_lpm(struct ata_link *link, enum ata_lpm_policy policy, |
| unsigned hints) |
| { |
| return sata_link_scr_lpm(link, policy, true); |
| } |
| |
| /** |
| * sata_pmp_read_gscr - read GSCR block of SATA PMP |
| * @dev: PMP device |
| * @gscr: buffer to read GSCR block into |
| * |
| * Read selected PMP GSCRs from the PMP at @dev. This will serve |
| * as configuration and identification info for the PMP. |
| * |
| * LOCKING: |
| * Kernel thread context (may sleep). |
| * |
| * RETURNS: |
| * 0 on success, -errno on failure. |
| */ |
| static int sata_pmp_read_gscr(struct ata_device *dev, u32 *gscr) |
| { |
| static const int gscr_to_read[] = { 0, 1, 2, 32, 33, 64, 96 }; |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) { |
| int reg = gscr_to_read[i]; |
| unsigned int err_mask; |
| |
| err_mask = sata_pmp_read(dev->link, reg, &gscr[reg]); |
| if (err_mask) { |
| ata_dev_printk(dev, KERN_ERR, "failed to read PMP " |
| "GSCR[%d] (Emask=0x%x)\n", reg, err_mask); |
| return -EIO; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static const char *sata_pmp_spec_rev_str(const u32 *gscr) |
| { |
| u32 rev = gscr[SATA_PMP_GSCR_REV]; |
| |
| if (rev & (1 << 3)) |
| return "1.2"; |
| if (rev & (1 << 2)) |
| return "1.1"; |
| if (rev & (1 << 1)) |
| return "1.0"; |
| return "<unknown>"; |
| } |
| |
| #define PMP_GSCR_SII_POL 129 |
| |
| static int sata_pmp_configure(struct ata_device *dev, int print_info) |
| { |
| struct ata_port *ap = dev->link->ap; |
| u32 *gscr = dev->gscr; |
| u16 vendor = sata_pmp_gscr_vendor(gscr); |
| u16 devid = sata_pmp_gscr_devid(gscr); |
| unsigned int err_mask = 0; |
| const char *reason; |
| int nr_ports, rc; |
| |
| nr_ports = sata_pmp_gscr_ports(gscr); |
| |
| if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) { |
| rc = -EINVAL; |
| reason = "invalid nr_ports"; |
| goto fail; |
| } |
| |
| if ((ap->flags & ATA_FLAG_AN) && |
| (gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY)) |
| dev->flags |= ATA_DFLAG_AN; |
| |
| /* monitor SERR_PHYRDY_CHG on fan-out ports */ |
| err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN, |
| SERR_PHYRDY_CHG); |
| if (err_mask) { |
| rc = -EIO; |
| reason = "failed to write GSCR_ERROR_EN"; |
| goto fail; |
| } |
| |
| /* Disable sending Early R_OK. |
| * With "cached read" HDD testing and multiple ports busy on a SATA |
| * host controller, 3726 PMP will very rarely drop a deferred |
| * R_OK that was intended for the host. Symptom will be all |
| * 5 drives under test will timeout, get reset, and recover. |
| */ |
| if (vendor == 0x1095 && devid == 0x3726) { |
| u32 reg; |
| |
| err_mask = sata_pmp_read(&ap->link, PMP_GSCR_SII_POL, ®); |
| if (err_mask) { |
| rc = -EIO; |
| reason = "failed to read Sil3726 Private Register"; |
| goto fail; |
| } |
| reg &= ~0x1; |
| err_mask = sata_pmp_write(&ap->link, PMP_GSCR_SII_POL, reg); |
| if (err_mask) { |
| rc = -EIO; |
| reason = "failed to write Sil3726 Private Register"; |
| goto fail; |
| } |
| } |
| |
| if (print_info) { |
| ata_dev_printk(dev, KERN_INFO, "Port Multiplier %s, " |
| "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n", |
| sata_pmp_spec_rev_str(gscr), vendor, devid, |
| sata_pmp_gscr_rev(gscr), |
| nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN], |
| gscr[SATA_PMP_GSCR_FEAT]); |
| |
| if (!(dev->flags & ATA_DFLAG_AN)) |
| ata_dev_printk(dev, KERN_INFO, |
| "Asynchronous notification not supported, " |
| "hotplug won't\n work on fan-out " |
| "ports. Use warm-plug instead.\n"); |
| } |
| |
| return 0; |
| |
| fail: |
| ata_dev_printk(dev, KERN_ERR, |
| "failed to configure Port Multiplier (%s, Emask=0x%x)\n", |
| reason, err_mask); |
| return rc; |
| } |
| |
| static int sata_pmp_init_links (struct ata_port *ap, int nr_ports) |
| { |
| struct ata_link *pmp_link = ap->pmp_link; |
| int i, err; |
| |
| if (!pmp_link) { |
| pmp_link = kzalloc(sizeof(pmp_link[0]) * SATA_PMP_MAX_PORTS, |
| GFP_NOIO); |
| if (!pmp_link) |
| return -ENOMEM; |
| |
| for (i = 0; i < SATA_PMP_MAX_PORTS; i++) |
| ata_link_init(ap, &pmp_link[i], i); |
| |
| ap->pmp_link = pmp_link; |
| |
| for (i = 0; i < SATA_PMP_MAX_PORTS; i++) { |
| err = ata_tlink_add(&pmp_link[i]); |
| if (err) { |
| goto err_tlink; |
| } |
| } |
| } |
| |
| for (i = 0; i < nr_ports; i++) { |
| struct ata_link *link = &pmp_link[i]; |
| struct ata_eh_context *ehc = &link->eh_context; |
| |
| link->flags = 0; |
| ehc->i.probe_mask |= ATA_ALL_DEVICES; |
| ehc->i.action |= ATA_EH_RESET; |
| } |
| |
| return 0; |
| err_tlink: |
| while (--i >= 0) |
| ata_tlink_delete(&pmp_link[i]); |
| kfree(pmp_link); |
| ap->pmp_link = NULL; |
| return err; |
| } |
| |
| static void sata_pmp_quirks(struct ata_port *ap) |
| { |
| u32 *gscr = ap->link.device->gscr; |
| u16 vendor = sata_pmp_gscr_vendor(gscr); |
| u16 devid = sata_pmp_gscr_devid(gscr); |
| struct ata_link *link; |
| |
| if (vendor == 0x1095 && devid == 0x3726) { |
| /* sil3726 quirks */ |
| ata_for_each_link(link, ap, EDGE) { |
| /* link reports offline after LPM */ |
| link->flags |= ATA_LFLAG_NO_LPM; |
| |
| /* Class code report is unreliable and SRST |
| * times out under certain configurations. |
| */ |
| if (link->pmp < 5) |
| link->flags |= ATA_LFLAG_NO_SRST | |
| ATA_LFLAG_ASSUME_ATA; |
| |
| /* port 5 is for SEMB device and it doesn't like SRST */ |
| if (link->pmp == 5) |
| link->flags |= ATA_LFLAG_NO_SRST | |
| ATA_LFLAG_ASSUME_SEMB; |
| } |
| } else if (vendor == 0x1095 && devid == 0x4723) { |
| /* sil4723 quirks */ |
| ata_for_each_link(link, ap, EDGE) { |
| /* link reports offline after LPM */ |
| link->flags |= ATA_LFLAG_NO_LPM; |
| |
| /* class code report is unreliable */ |
| if (link->pmp < 2) |
| link->flags |= ATA_LFLAG_ASSUME_ATA; |
| |
| /* the config device at port 2 locks up on SRST */ |
| if (link->pmp == 2) |
| link->flags |= ATA_LFLAG_NO_SRST | |
| ATA_LFLAG_ASSUME_ATA; |
| } |
| } else if (vendor == 0x1095 && devid == 0x4726) { |
| /* sil4726 quirks */ |
| ata_for_each_link(link, ap, EDGE) { |
| /* link reports offline after LPM */ |
| link->flags |= ATA_LFLAG_NO_LPM; |
| |
| /* Class code report is unreliable and SRST |
| * times out under certain configurations. |
| * Config device can be at port 0 or 5 and |
| * locks up on SRST. |
| */ |
| if (link->pmp <= 5) |
| link->flags |= ATA_LFLAG_NO_SRST | |
| ATA_LFLAG_ASSUME_ATA; |
| |
| /* Port 6 is for SEMB device which doesn't |
| * like SRST either. |
| */ |
| if (link->pmp == 6) |
| link->flags |= ATA_LFLAG_NO_SRST | |
| ATA_LFLAG_ASSUME_SEMB; |
| } |
| } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 || |
| devid == 0x5734 || devid == 0x5744)) { |
| /* sil5723/5744 quirks */ |
| |
| /* sil5723/5744 has either two or three downstream |
| * ports depending on operation mode. The last port |
| * is empty if any actual IO device is available or |
| * occupied by a pseudo configuration device |
| * otherwise. Don't try hard to recover it. |
| */ |
| ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY; |
| } |
| } |
| |
| /** |
| * sata_pmp_attach - attach a SATA PMP device |
| * @dev: SATA PMP device to attach |
| * |
| * Configure and attach SATA PMP device @dev. This function is |
| * also responsible for allocating and initializing PMP links. |
| * |
| * LOCKING: |
| * Kernel thread context (may sleep). |
| * |
| * RETURNS: |
| * 0 on success, -errno on failure. |
| */ |
| int sata_pmp_attach(struct ata_device *dev) |
| { |
| struct ata_link *link = dev->link; |
| struct ata_port *ap = link->ap; |
| unsigned long flags; |
| struct ata_link *tlink; |
| int rc; |
| |
| /* is it hanging off the right place? */ |
| if (!sata_pmp_supported(ap)) { |
| ata_dev_printk(dev, KERN_ERR, |
| "host does not support Port Multiplier\n"); |
| return -EINVAL; |
| } |
| |
| if (!ata_is_host_link(link)) { |
| ata_dev_printk(dev, KERN_ERR, |
| "Port Multipliers cannot be nested\n"); |
| return -EINVAL; |
| } |
| |
| if (dev->devno) { |
| ata_dev_printk(dev, KERN_ERR, |
| "Port Multiplier must be the first device\n"); |
| return -EINVAL; |
| } |
| |
| WARN_ON(link->pmp != 0); |
| link->pmp = SATA_PMP_CTRL_PORT; |
| |
| /* read GSCR block */ |
| rc = sata_pmp_read_gscr(dev, dev->gscr); |
| if (rc) |
| goto fail; |
| |
| /* config PMP */ |
| rc = sata_pmp_configure(dev, 1); |
| if (rc) |
| goto fail; |
| |
| rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr)); |
| if (rc) { |
| ata_dev_printk(dev, KERN_INFO, |
| "failed to initialize PMP links\n"); |
| goto fail; |
| } |
| |
| /* attach it */ |
| spin_lock_irqsave(ap->lock, flags); |
| WARN_ON(ap->nr_pmp_links); |
| ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr); |
| spin_unlock_irqrestore(ap->lock, flags); |
| |
| sata_pmp_quirks(ap); |
| |
| if (ap->ops->pmp_attach) |
| ap->ops->pmp_attach(ap); |
| |
| ata_for_each_link(tlink, ap, EDGE) |
| sata_link_init_spd(tlink); |
| |
| ata_acpi_associate_sata_port(ap); |
| |
| return 0; |
| |
| fail: |
| link->pmp = 0; |
| return rc; |
| } |
| |
| /** |
| * sata_pmp_detach - detach a SATA PMP device |
| * @dev: SATA PMP device to detach |
| * |
| * Detach SATA PMP device @dev. This function is also |
| * responsible for deconfiguring PMP links. |
| * |
| * LOCKING: |
| * Kernel thread context (may sleep). |
| */ |
| static void sata_pmp_detach(struct ata_device *dev) |
| { |
| struct ata_link *link = dev->link; |
| struct ata_port *ap = link->ap; |
| struct ata_link *tlink; |
| unsigned long flags; |
| |
| ata_dev_printk(dev, KERN_INFO, "Port Multiplier detaching\n"); |
| |
| WARN_ON(!ata_is_host_link(link) || dev->devno || |
| link->pmp != SATA_PMP_CTRL_PORT); |
| |
| if (ap->ops->pmp_detach) |
| ap->ops->pmp_detach(ap); |
| |
| ata_for_each_link(tlink, ap, EDGE) |
| ata_eh_detach_dev(tlink->device); |
| |
| spin_lock_irqsave(ap->lock, flags); |
| ap->nr_pmp_links = 0; |
| link->pmp = 0; |
| spin_unlock_irqrestore(ap->lock, flags); |
| |
| ata_acpi_associate_sata_port(ap); |
| } |
| |
| /** |
| * sata_pmp_same_pmp - does new GSCR matches the configured PMP? |
| * @dev: PMP device to compare against |
| * @new_gscr: GSCR block of the new device |
| * |
| * Compare @new_gscr against @dev and determine whether @dev is |
| * the PMP described by @new_gscr. |
| * |
| * LOCKING: |
| * None. |
| * |
| * RETURNS: |
| * 1 if @dev matches @new_gscr, 0 otherwise. |
| */ |
| static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr) |
| { |
| const u32 *old_gscr = dev->gscr; |
| u16 old_vendor, new_vendor, old_devid, new_devid; |
| int old_nr_ports, new_nr_ports; |
| |
| old_vendor = sata_pmp_gscr_vendor(old_gscr); |
| new_vendor = sata_pmp_gscr_vendor(new_gscr); |
| old_devid = sata_pmp_gscr_devid(old_gscr); |
| new_devid = sata_pmp_gscr_devid(new_gscr); |
| old_nr_ports = sata_pmp_gscr_ports(old_gscr); |
| new_nr_ports = sata_pmp_gscr_ports(new_gscr); |
| |
| if (old_vendor != new_vendor) { |
| ata_dev_printk(dev, KERN_INFO, "Port Multiplier " |
| "vendor mismatch '0x%x' != '0x%x'\n", |
| old_vendor, new_vendor); |
| return 0; |
| } |
| |
| if (old_devid != new_devid) { |
| ata_dev_printk(dev, KERN_INFO, "Port Multiplier " |
| "device ID mismatch '0x%x' != '0x%x'\n", |
| old_devid, new_devid); |
| return 0; |
| } |
| |
| if (old_nr_ports != new_nr_ports) { |
| ata_dev_printk(dev, KERN_INFO, "Port Multiplier " |
| "nr_ports mismatch '0x%x' != '0x%x'\n", |
| old_nr_ports, new_nr_ports); |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| /** |
| * sata_pmp_revalidate - revalidate SATA PMP |
| * @dev: PMP device to revalidate |
| * @new_class: new class code |
| * |
| * Re-read GSCR block and make sure @dev is still attached to the |
| * port and properly configured. |
| * |
| * LOCKING: |
| * Kernel thread context (may sleep). |
| * |
| * RETURNS: |
| * 0 on success, -errno otherwise. |
| */ |
| static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class) |
| { |
| struct ata_link *link = dev->link; |
| struct ata_port *ap = link->ap; |
| u32 *gscr = (void *)ap->sector_buf; |
| int rc; |
| |
| DPRINTK("ENTER\n"); |
| |
| ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE); |
| |
| if (!ata_dev_enabled(dev)) { |
| rc = -ENODEV; |
| goto fail; |
| } |
| |
| /* wrong class? */ |
| if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) { |
| rc = -ENODEV; |
| goto fail; |
| } |
| |
| /* read GSCR */ |
| rc = sata_pmp_read_gscr(dev, gscr); |
| if (rc) |
| goto fail; |
| |
| /* is the pmp still there? */ |
| if (!sata_pmp_same_pmp(dev, gscr)) { |
| rc = -ENODEV; |
| goto fail; |
| } |
| |
| memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS); |
| |
| rc = sata_pmp_configure(dev, 0); |
| if (rc) |
| goto fail; |
| |
| ata_eh_done(link, NULL, ATA_EH_REVALIDATE); |
| |
| DPRINTK("EXIT, rc=0\n"); |
| return 0; |
| |
| fail: |
| ata_dev_printk(dev, KERN_ERR, |
| "PMP revalidation failed (errno=%d)\n", rc); |
| DPRINTK("EXIT, rc=%d\n", rc); |
| return rc; |
| } |
| |
| /** |
| * sata_pmp_revalidate_quick - revalidate SATA PMP quickly |
| * @dev: PMP device to revalidate |
| * |
| * Make sure the attached PMP is accessible. |
| * |
| * LOCKING: |
| * Kernel thread context (may sleep). |
| * |
| * RETURNS: |
| * 0 on success, -errno otherwise. |
| */ |
| static int sata_pmp_revalidate_quick(struct ata_device *dev) |
| { |
| unsigned int err_mask; |
| u32 prod_id; |
| |
| err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id); |
| if (err_mask) { |
| ata_dev_printk(dev, KERN_ERR, "failed to read PMP product ID " |
| "(Emask=0x%x)\n", err_mask); |
| return -EIO; |
| } |
| |
| if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) { |
| ata_dev_printk(dev, KERN_ERR, "PMP product ID mismatch\n"); |
| /* something weird is going on, request full PMP recovery */ |
| return -EIO; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * sata_pmp_eh_recover_pmp - recover PMP |
| * @ap: ATA port PMP is attached to |
| * @prereset: prereset method (can be NULL) |
| * @softreset: softreset method |
| * @hardreset: hardreset method |
| * @postreset: postreset method (can be NULL) |
| * |
| * Recover PMP attached to @ap. Recovery procedure is somewhat |
| * similar to that of ata_eh_recover() except that reset should |
| * always be performed in hard->soft sequence and recovery |
| * failure results in PMP detachment. |
| * |
| * LOCKING: |
| * Kernel thread context (may sleep). |
| * |
| * RETURNS: |
| * 0 on success, -errno on failure. |
| */ |
| static int sata_pmp_eh_recover_pmp(struct ata_port *ap, |
| ata_prereset_fn_t prereset, ata_reset_fn_t softreset, |
| ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) |
| { |
| struct ata_link *link = &ap->link; |
| struct ata_eh_context *ehc = &link->eh_context; |
| struct ata_device *dev = link->device; |
| int tries = ATA_EH_PMP_TRIES; |
| int detach = 0, rc = 0; |
| int reval_failed = 0; |
| |
| DPRINTK("ENTER\n"); |
| |
| if (dev->flags & ATA_DFLAG_DETACH) { |
| detach = 1; |
| goto fail; |
| } |
| |
| retry: |
| ehc->classes[0] = ATA_DEV_UNKNOWN; |
| |
| if (ehc->i.action & ATA_EH_RESET) { |
| struct ata_link *tlink; |
| |
| /* reset */ |
| rc = ata_eh_reset(link, 0, prereset, softreset, hardreset, |
| postreset); |
| if (rc) { |
| ata_link_printk(link, KERN_ERR, |
| "failed to reset PMP, giving up\n"); |
| goto fail; |
| } |
| |
| /* PMP is reset, SErrors cannot be trusted, scan all */ |
| ata_for_each_link(tlink, ap, EDGE) { |
| struct ata_eh_context *ehc = &tlink->eh_context; |
| |
| ehc->i.probe_mask |= ATA_ALL_DEVICES; |
| ehc->i.action |= ATA_EH_RESET; |
| } |
| } |
| |
| /* If revalidation is requested, revalidate and reconfigure; |
| * otherwise, do quick revalidation. |
| */ |
| if (ehc->i.action & ATA_EH_REVALIDATE) |
| rc = sata_pmp_revalidate(dev, ehc->classes[0]); |
| else |
| rc = sata_pmp_revalidate_quick(dev); |
| |
| if (rc) { |
| tries--; |
| |
| if (rc == -ENODEV) { |
| ehc->i.probe_mask |= ATA_ALL_DEVICES; |
| detach = 1; |
| /* give it just two more chances */ |
| tries = min(tries, 2); |
| } |
| |
| if (tries) { |
| /* consecutive revalidation failures? speed down */ |
| if (reval_failed) |
| sata_down_spd_limit(link, 0); |
| else |
| reval_failed = 1; |
| |
| ehc->i.action |= ATA_EH_RESET; |
| goto retry; |
| } else { |
| ata_dev_printk(dev, KERN_ERR, "failed to recover PMP " |
| "after %d tries, giving up\n", |
| ATA_EH_PMP_TRIES); |
| goto fail; |
| } |
| } |
| |
| /* okay, PMP resurrected */ |
| ehc->i.flags = 0; |
| |
| DPRINTK("EXIT, rc=0\n"); |
| return 0; |
| |
| fail: |
| sata_pmp_detach(dev); |
| if (detach) |
| ata_eh_detach_dev(dev); |
| else |
| ata_dev_disable(dev); |
| |
| DPRINTK("EXIT, rc=%d\n", rc); |
| return rc; |
| } |
| |
| static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap) |
| { |
| struct ata_link *link; |
| unsigned long flags; |
| int rc; |
| |
| spin_lock_irqsave(ap->lock, flags); |
| |
| ata_for_each_link(link, ap, EDGE) { |
| if (!(link->flags & ATA_LFLAG_DISABLED)) |
| continue; |
| |
| spin_unlock_irqrestore(ap->lock, flags); |
| |
| /* Some PMPs require hardreset sequence to get |
| * SError.N working. |
| */ |
| sata_link_hardreset(link, sata_deb_timing_normal, |
| ata_deadline(jiffies, ATA_TMOUT_INTERNAL_QUICK), |
| NULL, NULL); |
| |
| /* unconditionally clear SError.N */ |
| rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG); |
| if (rc) { |
| ata_link_printk(link, KERN_ERR, "failed to clear " |
| "SError.N (errno=%d)\n", rc); |
| return rc; |
| } |
| |
| spin_lock_irqsave(ap->lock, flags); |
| } |
| |
| spin_unlock_irqrestore(ap->lock, flags); |
| |
| return 0; |
| } |
| |
| static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries) |
| { |
| struct ata_port *ap = link->ap; |
| unsigned long flags; |
| |
| if (link_tries[link->pmp] && --link_tries[link->pmp]) |
| return 1; |
| |
| /* disable this link */ |
| if (!(link->flags & ATA_LFLAG_DISABLED)) { |
| ata_link_printk(link, KERN_WARNING, |
| "failed to recover link after %d tries, disabling\n", |
| ATA_EH_PMP_LINK_TRIES); |
| |
| spin_lock_irqsave(ap->lock, flags); |
| link->flags |= ATA_LFLAG_DISABLED; |
| spin_unlock_irqrestore(ap->lock, flags); |
| } |
| |
| ata_dev_disable(link->device); |
| link->eh_context.i.action = 0; |
| |
| return 0; |
| } |
| |
| /** |
| * sata_pmp_eh_recover - recover PMP-enabled port |
| * @ap: ATA port to recover |
| * |
| * Drive EH recovery operation for PMP enabled port @ap. This |
| * function recovers host and PMP ports with proper retrials and |
| * fallbacks. Actual recovery operations are performed using |
| * ata_eh_recover() and sata_pmp_eh_recover_pmp(). |
| * |
| * LOCKING: |
| * Kernel thread context (may sleep). |
| * |
| * RETURNS: |
| * 0 on success, -errno on failure. |
| */ |
| static int sata_pmp_eh_recover(struct ata_port *ap) |
| { |
| struct ata_port_operations *ops = ap->ops; |
| int pmp_tries, link_tries[SATA_PMP_MAX_PORTS]; |
| struct ata_link *pmp_link = &ap->link; |
| struct ata_device *pmp_dev = pmp_link->device; |
| struct ata_eh_context *pmp_ehc = &pmp_link->eh_context; |
| u32 *gscr = pmp_dev->gscr; |
| struct ata_link *link; |
| struct ata_device *dev; |
| unsigned int err_mask; |
| u32 gscr_error, sntf; |
| int cnt, rc; |
| |
| pmp_tries = ATA_EH_PMP_TRIES; |
| ata_for_each_link(link, ap, EDGE) |
| link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; |
| |
| retry: |
| /* PMP attached? */ |
| if (!sata_pmp_attached(ap)) { |
| rc = ata_eh_recover(ap, ops->prereset, ops->softreset, |
| ops->hardreset, ops->postreset, NULL); |
| if (rc) { |
| ata_for_each_dev(dev, &ap->link, ALL) |
| ata_dev_disable(dev); |
| return rc; |
| } |
| |
| if (pmp_dev->class != ATA_DEV_PMP) |
| return 0; |
| |
| /* new PMP online */ |
| ata_for_each_link(link, ap, EDGE) |
| link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; |
| |
| /* fall through */ |
| } |
| |
| /* recover pmp */ |
| rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset, |
| ops->hardreset, ops->postreset); |
| if (rc) |
| goto pmp_fail; |
| |
| /* PHY event notification can disturb reset and other recovery |
| * operations. Turn it off. |
| */ |
| if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) { |
| gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY; |
| |
| err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN, |
| gscr[SATA_PMP_GSCR_FEAT_EN]); |
| if (err_mask) { |
| ata_link_printk(pmp_link, KERN_WARNING, |
| "failed to disable NOTIFY (err_mask=0x%x)\n", |
| err_mask); |
| goto pmp_fail; |
| } |
| } |
| |
| /* handle disabled links */ |
| rc = sata_pmp_eh_handle_disabled_links(ap); |
| if (rc) |
| goto pmp_fail; |
| |
| /* recover links */ |
| rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset, |
| ops->pmp_hardreset, ops->pmp_postreset, &link); |
| if (rc) |
| goto link_fail; |
| |
| /* clear SNotification */ |
| rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf); |
| if (rc == 0) |
| sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf); |
| |
| /* |
| * If LPM is active on any fan-out port, hotplug wouldn't |
| * work. Return w/ PHY event notification disabled. |
| */ |
| ata_for_each_link(link, ap, EDGE) |
| if (link->lpm_policy > ATA_LPM_MAX_POWER) |
| return 0; |
| |
| /* |
| * Connection status might have changed while resetting other |
| * links, enable notification and check SATA_PMP_GSCR_ERROR |
| * before returning. |
| */ |
| |
| /* enable notification */ |
| if (pmp_dev->flags & ATA_DFLAG_AN) { |
| gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY; |
| |
| err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN, |
| gscr[SATA_PMP_GSCR_FEAT_EN]); |
| if (err_mask) { |
| ata_dev_printk(pmp_dev, KERN_ERR, "failed to write " |
| "PMP_FEAT_EN (Emask=0x%x)\n", err_mask); |
| rc = -EIO; |
| goto pmp_fail; |
| } |
| } |
| |
| /* check GSCR_ERROR */ |
| err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error); |
| if (err_mask) { |
| ata_dev_printk(pmp_dev, KERN_ERR, "failed to read " |
| "PMP_GSCR_ERROR (Emask=0x%x)\n", err_mask); |
| rc = -EIO; |
| goto pmp_fail; |
| } |
| |
| cnt = 0; |
| ata_for_each_link(link, ap, EDGE) { |
| if (!(gscr_error & (1 << link->pmp))) |
| continue; |
| |
| if (sata_pmp_handle_link_fail(link, link_tries)) { |
| ata_ehi_hotplugged(&link->eh_context.i); |
| cnt++; |
| } else { |
| ata_link_printk(link, KERN_WARNING, |
| "PHY status changed but maxed out on retries, " |
| "giving up\n"); |
| ata_link_printk(link, KERN_WARNING, |
| "Manully issue scan to resume this link\n"); |
| } |
| } |
| |
| if (cnt) { |
| ata_port_printk(ap, KERN_INFO, "PMP SError.N set for some " |
| "ports, repeating recovery\n"); |
| goto retry; |
| } |
| |
| return 0; |
| |
| link_fail: |
| if (sata_pmp_handle_link_fail(link, link_tries)) { |
| pmp_ehc->i.action |= ATA_EH_RESET; |
| goto retry; |
| } |
| |
| /* fall through */ |
| pmp_fail: |
| /* Control always ends up here after detaching PMP. Shut up |
| * and return if we're unloading. |
| */ |
| if (ap->pflags & ATA_PFLAG_UNLOADING) |
| return rc; |
| |
| if (!sata_pmp_attached(ap)) |
| goto retry; |
| |
| if (--pmp_tries) { |
| pmp_ehc->i.action |= ATA_EH_RESET; |
| goto retry; |
| } |
| |
| ata_port_printk(ap, KERN_ERR, |
| "failed to recover PMP after %d tries, giving up\n", |
| ATA_EH_PMP_TRIES); |
| sata_pmp_detach(pmp_dev); |
| ata_dev_disable(pmp_dev); |
| |
| return rc; |
| } |
| |
| /** |
| * sata_pmp_error_handler - do standard error handling for PMP-enabled host |
| * @ap: host port to handle error for |
| * |
| * Perform standard error handling sequence for PMP-enabled host |
| * @ap. |
| * |
| * LOCKING: |
| * Kernel thread context (may sleep). |
| */ |
| void sata_pmp_error_handler(struct ata_port *ap) |
| { |
| ata_eh_autopsy(ap); |
| ata_eh_report(ap); |
| sata_pmp_eh_recover(ap); |
| ata_eh_finish(ap); |
| } |
| |
| EXPORT_SYMBOL_GPL(sata_pmp_port_ops); |
| EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch); |
| EXPORT_SYMBOL_GPL(sata_pmp_error_handler); |