diff options
Diffstat (limited to 'drivers/ata/libata-pmp.c')
| -rw-r--r-- | drivers/ata/libata-pmp.c | 1182 |
1 files changed, 1182 insertions, 0 deletions
diff --git a/drivers/ata/libata-pmp.c b/drivers/ata/libata-pmp.c new file mode 100644 index 000000000000..671d171055a3 --- /dev/null +++ b/drivers/ata/libata-pmp.c @@ -0,0 +1,1182 @@ +/* + * 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 "libata.h" + +/** + * sata_pmp_read - read PMP register + * @link: link to read PMP register for + * @reg: register to read + * @r_val: resulting value + * + * Wrapper around ap->ops->pmp_read to make it easier to call and + * nomarlize error return value. + * + * LOCKING: + * Kernel thread context (may sleep). + * + * RETURNS: + * 0 on success, -errno on failure. + */ +static 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; + int rc; + + might_sleep(); + + rc = ap->ops->pmp_read(pmp_dev, link->pmp, reg, r_val); + if (rc) + rc = -EIO; + return rc; +} + +/** + * sata_pmp_write - write PMP register + * @link: link to write PMP register for + * @reg: register to write + * @r_val: value to write + * + * Wrapper around ap->ops->pmp_write to make it easier to call + * and nomarlize error return value. + * + * LOCKING: + * Kernel thread context (may sleep). + * + * RETURNS: + * 0 on success, -errno on failure. + */ +static 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; + int rc; + + might_sleep(); + + rc = ap->ops->pmp_write(pmp_dev, link->pmp, reg, val); + if (rc) + rc = -EIO; + return rc; +} + +/** + * sata_pmp_read_init_tf - initialize TF for PMP read + * @tf: taskfile to initialize + * @dev: PMP dev + * @pmp: port multiplier port number + * @reg: register to read + * + * Initialize @tf for PMP read command. + * + * LOCKING: + * None. + */ +void sata_pmp_read_init_tf(struct ata_taskfile *tf, + struct ata_device *dev, int pmp, int reg) +{ + ata_tf_init(dev, tf); + tf->command = ATA_CMD_PMP_READ; + tf->protocol = ATA_PROT_NODATA; + tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; + tf->feature = reg; + tf->device = pmp; +} + +/** + * sata_pmp_read_val - extract PMP read result from TF + * @tf: target TF + * + * Determine PMP read result from @tf. + * + * LOCKING: + * None. + */ +u32 sata_pmp_read_val(const struct ata_taskfile *tf) +{ + return tf->nsect | tf->lbal << 8 | tf->lbam << 16 | tf->lbah << 24; +} + +/** + * sata_pmp_read_init_tf - initialize TF for PMP write + * @tf: taskfile to initialize + * @dev: PMP dev + * @pmp: port multiplier port number + * @reg: register to read + * @val: value to write + * + * Initialize @tf for PMP write command. + * + * LOCKING: + * None. + */ +void sata_pmp_write_init_tf(struct ata_taskfile *tf, + struct ata_device *dev, int pmp, int reg, u32 val) +{ + ata_tf_init(dev, tf); + tf->command = ATA_CMD_PMP_WRITE; + tf->protocol = ATA_PROT_NODATA; + tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; + tf->feature = reg; + tf->device = pmp; + tf->nsect = val & 0xff; + tf->lbal = (val >> 8) & 0xff; + tf->lbam = (val >> 16) & 0xff; + tf->lbah = (val >> 24) & 0xff; +} + +/** + * 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) +{ + if (reg > SATA_PMP_PSCR_CONTROL) + return -EINVAL; + + return sata_pmp_read(link, reg, r_val); +} + +/** + * 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) +{ + if (reg > SATA_PMP_PSCR_CONTROL) + return -EINVAL; + + return sata_pmp_write(link, reg, val); +} + +/** + * sata_pmp_std_prereset - prepare PMP link for reset + * @link: link to be reset + * @deadline: deadline jiffies for the operation + * + * @link is about to be reset. Initialize it. + * + * LOCKING: + * Kernel thread context (may sleep) + * + * RETURNS: + * 0 on success, -errno otherwise. + */ +int sata_pmp_std_prereset(struct ata_link *link, unsigned long deadline) +{ + struct ata_eh_context *ehc = &link->eh_context; + const unsigned long *timing = sata_ehc_deb_timing(ehc); + int rc; + + /* force HRST? */ + if (link->flags & ATA_LFLAG_NO_SRST) + ehc->i.action |= ATA_EH_HARDRESET; + + /* handle link resume */ + if ((ehc->i.flags & ATA_EHI_RESUME_LINK) && + (link->flags & ATA_LFLAG_HRST_TO_RESUME)) + ehc->i.action |= ATA_EH_HARDRESET; + + /* if we're about to do hardreset, nothing more to do */ + if (ehc->i.action & ATA_EH_HARDRESET) + return 0; + + /* resume link */ + rc = sata_link_resume(link, timing, deadline); + if (rc) { + /* phy resume failed */ + ata_link_printk(link, KERN_WARNING, "failed to resume link " + "for reset (errno=%d)\n", rc); + return rc; + } + + /* clear SError bits including .X which blocks the port when set */ + rc = sata_scr_write(link, SCR_ERROR, 0xffffffff); + if (rc) { + ata_link_printk(link, KERN_ERR, + "failed to clear SError (errno=%d)\n", rc); + return rc; + } + + return 0; +} + +/** + * sata_pmp_std_hardreset - standard hardreset method for PMP link + * @link: link to be reset + * @class: resulting class of attached device + * @deadline: deadline jiffies for the operation + * + * Hardreset PMP port @link. Note that this function doesn't + * wait for BSY clearance. There simply isn't a generic way to + * wait the event. Instead, this function return -EAGAIN thus + * telling libata-EH to followup with softreset. + * + * LOCKING: + * Kernel thread context (may sleep) + * + * RETURNS: + * 0 on success, -errno otherwise. + */ +int sata_pmp_std_hardreset(struct ata_link *link, unsigned int *class, + unsigned long deadline) +{ + const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context); + u32 tmp; + int rc; + + DPRINTK("ENTER\n"); + + /* do hardreset */ + rc = sata_link_hardreset(link, timing, deadline); + if (rc) { + ata_link_printk(link, KERN_ERR, + "COMRESET failed (errno=%d)\n", rc); + goto out; + } + + /* clear SError bits including .X which blocks the port when set */ + rc = sata_scr_write(link, SCR_ERROR, 0xffffffff); + if (rc) { + ata_link_printk(link, KERN_ERR, "failed to clear SError " + "during hardreset (errno=%d)\n", rc); + goto out; + } + + /* if device is present, follow up with srst to wait for !BSY */ + if (ata_link_online(link)) + rc = -EAGAIN; + out: + /* if SCR isn't accessible, we need to reset the PMP */ + if (rc && rc != -EAGAIN && sata_scr_read(link, SCR_STATUS, &tmp)) + rc = -ERESTART; + + DPRINTK("EXIT, rc=%d\n", rc); + return rc; +} + +/** + * ata_std_postreset - standard postreset method for PMP link + * @link: the target ata_link + * @classes: classes of attached devices + * + * This function is invoked after a successful reset. Note that + * the device might have been reset more than once using + * different reset methods before postreset is invoked. + * + * LOCKING: + * Kernel thread context (may sleep) + */ +void sata_pmp_std_postreset(struct ata_link *link, unsigned int *class) +{ + u32 serror; + + DPRINTK("ENTER\n"); + + /* clear SError */ + if (sata_scr_read(link, SCR_ERROR, &serror) == 0) + sata_scr_write(link, SCR_ERROR, serror); + + /* print link status */ + sata_print_link_status(link); + + DPRINTK("EXIT\n"); +} + +/** + * 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, rc; + + for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) { + int reg = gscr_to_read[i]; + + rc = sata_pmp_read(dev->link, reg, &gscr[reg]); + if (rc) { + ata_dev_printk(dev, KERN_ERR, "failed to read " + "PMP GSCR[%d] (errno=%d)\n", reg, rc); + return rc; + } + } + + return 0; +} + +static const char *sata_pmp_spec_rev_str(const u32 *gscr) +{ + u32 rev = gscr[SATA_PMP_GSCR_REV]; + + if (rev & (1 << 2)) + return "1.1"; + if (rev & (1 << 1)) + return "1.0"; + return "<unknown>"; +} + +static int sata_pmp_configure(struct ata_device *dev, int print_info) +{ + struct ata_port *ap = dev->link->ap; + u32 *gscr = dev->gscr; + 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 */ + rc = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN, SERR_PHYRDY_CHG); + if (rc) { + reason = "failed to write GSCR_ERROR_EN"; + goto fail; + } + + /* turn off notification till fan-out ports are reset and configured */ + if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) { + gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY; + + rc = sata_pmp_write(dev->link, SATA_PMP_GSCR_FEAT_EN, + gscr[SATA_PMP_GSCR_FEAT_EN]); + if (rc) { + reason = "failed to write GSCR_FEAT_EN"; + 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), + sata_pmp_gscr_vendor(gscr), + sata_pmp_gscr_devid(gscr), + 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)\n", reason); + 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; + + 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 < 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 |= 1; + ehc->i.action |= ATA_EH_SOFTRESET; + ehc->i.flags |= ATA_EHI_RESUME_LINK; + } + + return 0; +} + +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_port_for_each_link(link, ap) { + /* SError.N need a kick in the ass to get working */ + link->flags |= ATA_LFLAG_HRST_TO_RESUME; + + /* class code report is unreliable */ + if (link->pmp < 5) + link->flags |= 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_port_for_each_link(link, ap) { + /* SError.N need a kick in the ass to get working */ + link->flags |= ATA_LFLAG_HRST_TO_RESUME; + + /* 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_port_for_each_link(link, ap) { + /* SError.N need a kick in the ass to get working */ + link->flags |= ATA_LFLAG_HRST_TO_RESUME; + + /* class code report is unreliable */ + if (link->pmp < 5) + link->flags |= ATA_LFLAG_ASSUME_ATA; + + /* The config device, which can be either at + * port 0 or 5, locks up on SRST. + */ + if (link->pmp == 0 || 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; + } else if (vendor == 0x11ab && devid == 0x4140) { + /* Marvell 88SM4140 quirks. Fan-out ports require PHY + * reset to work; other than that, it behaves very + * nicely. + */ + ata_port_for_each_link(link, ap) + link->flags |= ATA_LFLAG_HRST_TO_RESUME; + } +} + +/** + * 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 (!(ap->flags & ATA_FLAG_PMP)) { + 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_port_for_each_link(tlink, ap) + sata_link_init_spd(tlink); + + 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_port_for_each_link(tlink, ap) + 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); +} + +/** + * 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) +{ + u32 prod_id; + int rc; + + rc = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id); + if (rc) { + ata_dev_printk(dev, KERN_ERR, "failed to read PMP product ID\n"); + return rc; + } + + 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_MASK) { + struct ata_link *tlink; + + ata_eh_freeze_port(ap); + + /* reset */ + ehc->i.action = ATA_EH_HARDRESET; + 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; + } + + ata_eh_thaw_port(ap); + + /* PMP is reset, SErrors cannot be trusted, scan all */ + ata_port_for_each_link(tlink, ap) + ata_ehi_schedule_probe(&tlink->eh_context.i); + } + + /* 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 |= 1; + detach = 1; + /* give it just two more chances */ + tries = min(tries, 2); + } + + if (tries) { + int sleep = ehc->i.flags & ATA_EHI_DID_RESET; + + /* consecutive revalidation failures? speed down */ + if (reval_failed) + sata_down_spd_limit(link); + else + reval_failed = 1; + + ata_dev_printk(dev, KERN_WARNING, + "retrying hardreset%s\n", + sleep ? " in 5 secs" : ""); + if (sleep) + ssleep(5); + ehc->i.action |= ATA_EH_HARDRESET; + 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_port_for_each_link(link, ap) { + if (!(link->flags & ATA_LFLAG_DISABLED)) + continue; + + spin_unlock_irqrestore(ap->lock, flags); + + /* Some PMPs require hardreset sequence to get + * SError.N working. + */ + if ((link->flags & ATA_LFLAG_HRST_TO_RESUME) && + (link->eh_context.i.flags & ATA_EHI_RESUME_LINK)) + sata_link_hardreset(link, sata_deb_timing_normal, + jiffies + ATA_TMOUT_INTERNAL_QUICK); + + /* 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 + * @prereset: prereset method (can be NULL) + * @softreset: softreset method + * @hardreset: hardreset method + * @postreset: postreset method (can be NULL) + * @pmp_prereset: PMP prereset method (can be NULL) + * @pmp_softreset: PMP softreset method (can be NULL) + * @pmp_hardreset: PMP hardreset method (can be NULL) + * @pmp_postreset: PMP postreset method (can be NULL) + * + * 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, + ata_prereset_fn_t prereset, ata_reset_fn_t softreset, + ata_reset_fn_t hardreset, ata_postreset_fn_t postreset, + ata_prereset_fn_t pmp_prereset, ata_reset_fn_t pmp_softreset, + ata_reset_fn_t pmp_hardreset, ata_postreset_fn_t pmp_postreset) +{ + 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; + struct ata_link *link; + struct ata_device *dev; + u32 gscr_error, sntf; + int cnt, rc; + + pmp_tries = ATA_EH_PMP_TRIES; + ata_port_for_each_link(link, ap) + link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; + + retry: + /* PMP attached? */ + if (!ap->nr_pmp_links) { + rc = ata_eh_recover(ap, prereset, softreset, hardreset, + postreset, NULL); + if (rc) { + ata_link_for_each_dev(dev, &ap->link) + ata_dev_disable(dev); + return rc; + } + + if (pmp_dev->class != ATA_DEV_PMP) + return 0; + + /* new PMP online */ + ata_port_for_each_link(link, ap) + link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; + + /* fall through */ + } + + /* recover pmp */ + rc = sata_pmp_eh_recover_pmp(ap, prereset, softreset, hardreset, + postreset); + if (rc) + 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, pmp_prereset, pmp_softreset, pmp_hardreset, + pmp_postreset, &link); + if (rc) + goto link_fail; + + /* Connection status might have changed while resetting other + * links, check SATA_PMP_GSCR_ERROR before returning. + */ + + /* clear SNotification */ + rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf); + if (rc == 0) + sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf); + + /* enable notification */ + if (pmp_dev->flags & ATA_DFLAG_AN) { + pmp_dev->gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY; + + rc = sata_pmp_write(pmp_dev->link, SATA_PMP_GSCR_FEAT_EN, + pmp_dev->gscr[SATA_PMP_GSCR_FEAT_EN]); + if (rc) { + ata_dev_printk(pmp_dev, KERN_ERR, + "failed to write PMP_FEAT_EN\n"); + goto pmp_fail; + } + } + + /* check GSCR_ERROR */ + rc = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error); + if (rc) { + ata_dev_printk(pmp_dev, KERN_ERR, + "failed to read PMP_GSCR_ERROR\n"); + goto pmp_fail; + } + + cnt = 0; + ata_port_for_each_link(link, ap) { + 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_HARDRESET; + 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 (!ap->nr_pmp_links) + goto retry; + + if (--pmp_tries) { + ata_port_printk(ap, KERN_WARNING, + "failed to recover PMP, retrying in 5 secs\n"); + pmp_ehc->i.action |= ATA_EH_HARDRESET; + ssleep(5); + 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_do_eh - do standard error handling for PMP-enabled host + * @ap: host port to handle error for + * @prereset: prereset method (can be NULL) + * @softreset: softreset method + * @hardreset: hardreset method + * @postreset: postreset method (can be NULL) + * @pmp_prereset: PMP prereset method (can be NULL) + * @pmp_softreset: PMP softreset method (can be NULL) + * @pmp_hardreset: PMP hardreset method (can be NULL) + * @pmp_postreset: PMP postreset method (can be NULL) + * + * Perform standard error handling sequence for PMP-enabled host + * @ap. + * + * LOCKING: + * Kernel thread context (may sleep). + */ +void sata_pmp_do_eh(struct ata_port *ap, + ata_prereset_fn_t prereset, ata_reset_fn_t softreset, + ata_reset_fn_t hardreset, ata_postreset_fn_t postreset, + ata_prereset_fn_t pmp_prereset, ata_reset_fn_t pmp_softreset, + ata_reset_fn_t pmp_hardreset, ata_postreset_fn_t pmp_postreset) +{ + ata_eh_autopsy(ap); + ata_eh_report(ap); + sata_pmp_eh_recover(ap, prereset, softreset, hardreset, postreset, + pmp_prereset, pmp_softreset, pmp_hardreset, + pmp_postreset); + ata_eh_finish(ap); +} |
