Logo Search packages:      
Sourcecode: linux version File versions  Download package

libata-acpi.c

/*
 * libata-acpi.c
 * Provides ACPI support for PATA/SATA.
 *
 * Copyright (C) 2006 Intel Corp.
 * Copyright (C) 2006 Randy Dunlap
 */

#include <linux/module.h>
#include <linux/ata.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/acpi.h>
#include <linux/libata.h>
#include <linux/pci.h>
#include <scsi/scsi_device.h>
#include "libata.h"

#include <acpi/acpi_bus.h>
#include <acpi/acnames.h>
#include <acpi/acnamesp.h>
#include <acpi/acparser.h>
#include <acpi/acexcep.h>
#include <acpi/acmacros.h>
#include <acpi/actypes.h>

enum {
      ATA_ACPI_FILTER_SETXFER = 1 << 0,
      ATA_ACPI_FILTER_LOCK    = 1 << 1,

      ATA_ACPI_FILTER_DEFAULT = ATA_ACPI_FILTER_SETXFER |
                          ATA_ACPI_FILTER_LOCK,
};

static unsigned int ata_acpi_gtf_filter = ATA_ACPI_FILTER_DEFAULT;
module_param_named(acpi_gtf_filter, ata_acpi_gtf_filter, int, 0644);
MODULE_PARM_DESC(acpi_gtf_filter, "filter mask for ACPI _GTF commands, set to filter out (0x1=set xfermode, 0x2=lock/freeze lock)");

#define NO_PORT_MULT          0xffff
#define SATA_ADR(root, pmp)   (((root) << 16) | (pmp))

#define REGS_PER_GTF          7
struct ata_acpi_gtf {
      u8    tf[REGS_PER_GTF]; /* regs. 0x1f1 - 0x1f7 */
} __packed;

/*
 *    Helper - belongs in the PCI layer somewhere eventually
 */
static int is_pci_dev(struct device *dev)
{
      return (dev->bus == &pci_bus_type);
}

static void ata_acpi_clear_gtf(struct ata_device *dev)
{
      kfree(dev->gtf_cache);
      dev->gtf_cache = NULL;
}

/**
 * ata_acpi_associate_sata_port - associate SATA port with ACPI objects
 * @ap: target SATA port
 *
 * Look up ACPI objects associated with @ap and initialize acpi_handle
 * fields of @ap, the port and devices accordingly.
 *
 * LOCKING:
 * EH context.
 *
 * RETURNS:
 * 0 on success, -errno on failure.
 */
void ata_acpi_associate_sata_port(struct ata_port *ap)
{
      WARN_ON(!(ap->flags & ATA_FLAG_ACPI_SATA));

      if (!ap->nr_pmp_links) {
            acpi_integer adr = SATA_ADR(ap->port_no, NO_PORT_MULT);

            ap->link.device->acpi_handle =
                  acpi_get_child(ap->host->acpi_handle, adr);
      } else {
            struct ata_link *link;

            ap->link.device->acpi_handle = NULL;

            ata_port_for_each_link(link, ap) {
                  acpi_integer adr = SATA_ADR(ap->port_no, link->pmp);

                  link->device->acpi_handle =
                        acpi_get_child(ap->host->acpi_handle, adr);
            }
      }
}

static void ata_acpi_associate_ide_port(struct ata_port *ap)
{
      int max_devices, i;

      ap->acpi_handle = acpi_get_child(ap->host->acpi_handle, ap->port_no);
      if (!ap->acpi_handle)
            return;

      max_devices = 1;
      if (ap->flags & ATA_FLAG_SLAVE_POSS)
            max_devices++;

      for (i = 0; i < max_devices; i++) {
            struct ata_device *dev = &ap->link.device[i];

            dev->acpi_handle = acpi_get_child(ap->acpi_handle, i);
      }

      if (ata_acpi_gtm(ap, &ap->__acpi_init_gtm) == 0)
            ap->pflags |= ATA_PFLAG_INIT_GTM_VALID;
}

static void ata_acpi_handle_hotplug(struct ata_port *ap, struct kobject *kobj,
                            u32 event)
{
      char event_string[12];
      char *envp[] = { event_string, NULL };
      struct ata_eh_info *ehi = &ap->link.eh_info;

      if (event == 0 || event == 1) {
             unsigned long flags;
             spin_lock_irqsave(ap->lock, flags);
             ata_ehi_clear_desc(ehi);
             ata_ehi_push_desc(ehi, "ACPI event");
             ata_ehi_hotplugged(ehi);
             ata_port_freeze(ap);
             spin_unlock_irqrestore(ap->lock, flags);
      }

      if (kobj) {
            sprintf(event_string, "BAY_EVENT=%d", event);
            kobject_uevent_env(kobj, KOBJ_CHANGE, envp);
      }
}

static void ata_acpi_dev_notify(acpi_handle handle, u32 event, void *data)
{
      struct ata_device *dev = data;
      struct kobject *kobj = NULL;

      if (dev->sdev)
            kobj = &dev->sdev->sdev_gendev.kobj;

      ata_acpi_handle_hotplug(dev->link->ap, kobj, event);
}

static void ata_acpi_ap_notify(acpi_handle handle, u32 event, void *data)
{
      struct ata_port *ap = data;

      ata_acpi_handle_hotplug(ap, &ap->dev->kobj, event);
}

/**
 * ata_acpi_associate - associate ATA host with ACPI objects
 * @host: target ATA host
 *
 * Look up ACPI objects associated with @host and initialize
 * acpi_handle fields of @host, its ports and devices accordingly.
 *
 * LOCKING:
 * EH context.
 *
 * RETURNS:
 * 0 on success, -errno on failure.
 */
void ata_acpi_associate(struct ata_host *host)
{
      int i, j;

      if (!is_pci_dev(host->dev) || libata_noacpi)
            return;

      host->acpi_handle = DEVICE_ACPI_HANDLE(host->dev);
      if (!host->acpi_handle)
            return;

      for (i = 0; i < host->n_ports; i++) {
            struct ata_port *ap = host->ports[i];

            if (host->ports[0]->flags & ATA_FLAG_ACPI_SATA)
                  ata_acpi_associate_sata_port(ap);
            else
                  ata_acpi_associate_ide_port(ap);

            if (ap->acpi_handle)
                  acpi_install_notify_handler (ap->acpi_handle,
                                         ACPI_SYSTEM_NOTIFY,
                                         ata_acpi_ap_notify,
                                         ap);

            for (j = 0; j < ata_link_max_devices(&ap->link); j++) {
                  struct ata_device *dev = &ap->link.device[j];

                  if (dev->acpi_handle)
                        acpi_install_notify_handler (dev->acpi_handle,
                                               ACPI_SYSTEM_NOTIFY,
                                               ata_acpi_dev_notify,
                                               dev);
            }
      }
}

/**
 * ata_acpi_dissociate - dissociate ATA host from ACPI objects
 * @host: target ATA host
 *
 * This function is called during driver detach after the whole host
 * is shut down.
 *
 * LOCKING:
 * EH context.
 */
void ata_acpi_dissociate(struct ata_host *host)
{
      int i;

      /* Restore initial _GTM values so that driver which attaches
       * afterward can use them too.
       */
      for (i = 0; i < host->n_ports; i++) {
            struct ata_port *ap = host->ports[i];
            const struct ata_acpi_gtm *gtm = ata_acpi_init_gtm(ap);

            if (ap->acpi_handle && gtm)
                  ata_acpi_stm(ap, gtm);
      }
}

/**
 * ata_acpi_gtm - execute _GTM
 * @ap: target ATA port
 * @gtm: out parameter for _GTM result
 *
 * Evaluate _GTM and store the result in @gtm.
 *
 * LOCKING:
 * EH context.
 *
 * RETURNS:
 * 0 on success, -ENOENT if _GTM doesn't exist, -errno on failure.
 */
int ata_acpi_gtm(struct ata_port *ap, struct ata_acpi_gtm *gtm)
{
      struct acpi_buffer output = { .length = ACPI_ALLOCATE_BUFFER };
      union acpi_object *out_obj;
      acpi_status status;
      int rc = 0;

      status = acpi_evaluate_object(ap->acpi_handle, "_GTM", NULL, &output);

      rc = -ENOENT;
      if (status == AE_NOT_FOUND)
            goto out_free;

      rc = -EINVAL;
      if (ACPI_FAILURE(status)) {
            ata_port_printk(ap, KERN_ERR,
                        "ACPI get timing mode failed (AE 0x%x)\n",
                        status);
            goto out_free;
      }

      out_obj = output.pointer;
      if (out_obj->type != ACPI_TYPE_BUFFER) {
            ata_port_printk(ap, KERN_WARNING,
                        "_GTM returned unexpected object type 0x%x\n",
                        out_obj->type);

            goto out_free;
      }

      if (out_obj->buffer.length != sizeof(struct ata_acpi_gtm)) {
            ata_port_printk(ap, KERN_ERR,
                        "_GTM returned invalid length %d\n",
                        out_obj->buffer.length);
            goto out_free;
      }

      memcpy(gtm, out_obj->buffer.pointer, sizeof(struct ata_acpi_gtm));
      rc = 0;
 out_free:
      kfree(output.pointer);
      return rc;
}

EXPORT_SYMBOL_GPL(ata_acpi_gtm);

/**
 * ata_acpi_stm - execute _STM
 * @ap: target ATA port
 * @stm: timing parameter to _STM
 *
 * Evaluate _STM with timing parameter @stm.
 *
 * LOCKING:
 * EH context.
 *
 * RETURNS:
 * 0 on success, -ENOENT if _STM doesn't exist, -errno on failure.
 */
int ata_acpi_stm(struct ata_port *ap, const struct ata_acpi_gtm *stm)
{
      acpi_status status;
      struct ata_acpi_gtm           stm_buf = *stm;
      struct acpi_object_list         input;
      union acpi_object               in_params[3];

      in_params[0].type = ACPI_TYPE_BUFFER;
      in_params[0].buffer.length = sizeof(struct ata_acpi_gtm);
      in_params[0].buffer.pointer = (u8 *)&stm_buf;
      /* Buffers for id may need byteswapping ? */
      in_params[1].type = ACPI_TYPE_BUFFER;
      in_params[1].buffer.length = 512;
      in_params[1].buffer.pointer = (u8 *)ap->link.device[0].id;
      in_params[2].type = ACPI_TYPE_BUFFER;
      in_params[2].buffer.length = 512;
      in_params[2].buffer.pointer = (u8 *)ap->link.device[1].id;

      input.count = 3;
      input.pointer = in_params;

      status = acpi_evaluate_object(ap->acpi_handle, "_STM", &input, NULL);

      if (status == AE_NOT_FOUND)
            return -ENOENT;
      if (ACPI_FAILURE(status)) {
            ata_port_printk(ap, KERN_ERR,
                  "ACPI set timing mode failed (status=0x%x)\n", status);
            return -EINVAL;
      }
      return 0;
}

EXPORT_SYMBOL_GPL(ata_acpi_stm);

/**
 * ata_dev_get_GTF - get the drive bootup default taskfile settings
 * @dev: target ATA device
 * @gtf: output parameter for buffer containing _GTF taskfile arrays
 *
 * This applies to both PATA and SATA drives.
 *
 * The _GTF method has no input parameters.
 * It returns a variable number of register set values (registers
 * hex 1F1..1F7, taskfiles).
 * The <variable number> is not known in advance, so have ACPI-CA
 * allocate the buffer as needed and return it, then free it later.
 *
 * LOCKING:
 * EH context.
 *
 * RETURNS:
 * Number of taskfiles on success, 0 if _GTF doesn't exist.  -EINVAL
 * if _GTF is invalid.
 */
static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf)
{
      struct ata_port *ap = dev->link->ap;
      acpi_status status;
      struct acpi_buffer output;
      union acpi_object *out_obj;
      int rc = 0;

      /* if _GTF is cached, use the cached value */
      if (dev->gtf_cache) {
            out_obj = dev->gtf_cache;
            goto done;
      }

      /* set up output buffer */
      output.length = ACPI_ALLOCATE_BUFFER;
      output.pointer = NULL;  /* ACPI-CA sets this; save/free it later */

      if (ata_msg_probe(ap))
            ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER: port#: %d\n",
                         __FUNCTION__, ap->port_no);

      /* _GTF has no input parameters */
      status = acpi_evaluate_object(dev->acpi_handle, "_GTF", NULL, &output);
      out_obj = dev->gtf_cache = output.pointer;

      if (ACPI_FAILURE(status)) {
            if (status != AE_NOT_FOUND) {
                  ata_dev_printk(dev, KERN_WARNING,
                               "_GTF evaluation failed (AE 0x%x)\n",
                               status);
                  rc = -EINVAL;
            }
            goto out_free;
      }

      if (!output.length || !output.pointer) {
            if (ata_msg_probe(ap))
                  ata_dev_printk(dev, KERN_DEBUG, "%s: Run _GTF: "
                        "length or ptr is NULL (0x%llx, 0x%p)\n",
                        __FUNCTION__,
                        (unsigned long long)output.length,
                        output.pointer);
            rc = -EINVAL;
            goto out_free;
      }

      if (out_obj->type != ACPI_TYPE_BUFFER) {
            ata_dev_printk(dev, KERN_WARNING,
                         "_GTF unexpected object type 0x%x\n",
                         out_obj->type);
            rc = -EINVAL;
            goto out_free;
      }

      if (out_obj->buffer.length % REGS_PER_GTF) {
            ata_dev_printk(dev, KERN_WARNING,
                         "unexpected _GTF length (%d)\n",
                         out_obj->buffer.length);
            rc = -EINVAL;
            goto out_free;
      }

 done:
      rc = out_obj->buffer.length / REGS_PER_GTF;
      if (gtf) {
            *gtf = (void *)out_obj->buffer.pointer;
            if (ata_msg_probe(ap))
                  ata_dev_printk(dev, KERN_DEBUG,
                               "%s: returning gtf=%p, gtf_count=%d\n",
                               __FUNCTION__, *gtf, rc);
      }
      return rc;

 out_free:
      ata_acpi_clear_gtf(dev);
      return rc;
}

/**
 * ata_acpi_cbl_80wire        -     Check for 80 wire cable
 * @ap: Port to check
 *
 * Return 1 if the ACPI mode data for this port indicates the BIOS selected
 * an 80wire mode.
 */

int ata_acpi_cbl_80wire(struct ata_port *ap)
{
      const struct ata_acpi_gtm *gtm = ata_acpi_init_gtm(ap);
      int valid = 0;

      if (!gtm)
            return 0;

      /* Split timing, DMA enabled */
      if ((gtm->flags & 0x11) == 0x11 && gtm->drive[0].dma < 55)
            valid |= 1;
      if ((gtm->flags & 0x14) == 0x14 && gtm->drive[1].dma < 55)
            valid |= 2;
      /* Shared timing, DMA enabled */
      if ((gtm->flags & 0x11) == 0x01 && gtm->drive[0].dma < 55)
            valid |= 1;
      if ((gtm->flags & 0x14) == 0x04 && gtm->drive[0].dma < 55)
            valid |= 2;

      /* Drive check */
      if ((valid & 1) && ata_dev_enabled(&ap->link.device[0]))
            return 1;
      if ((valid & 2) && ata_dev_enabled(&ap->link.device[1]))
            return 1;
      return 0;
}

EXPORT_SYMBOL_GPL(ata_acpi_cbl_80wire);

static void ata_acpi_gtf_to_tf(struct ata_device *dev,
                         const struct ata_acpi_gtf *gtf,
                         struct ata_taskfile *tf)
{
      ata_tf_init(dev, tf);

      tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
      tf->protocol = ATA_PROT_NODATA;
      tf->feature = gtf->tf[0];     /* 0x1f1 */
      tf->nsect   = gtf->tf[1];     /* 0x1f2 */
      tf->lbal    = gtf->tf[2];     /* 0x1f3 */
      tf->lbam    = gtf->tf[3];     /* 0x1f4 */
      tf->lbah    = gtf->tf[4];     /* 0x1f5 */
      tf->device  = gtf->tf[5];     /* 0x1f6 */
      tf->command = gtf->tf[6];     /* 0x1f7 */
}

static int ata_acpi_filter_tf(const struct ata_taskfile *tf,
                        const struct ata_taskfile *ptf)
{
      if (ata_acpi_gtf_filter & ATA_ACPI_FILTER_SETXFER) {
            /* libata doesn't use ACPI to configure transfer mode.
             * It will only confuse device configuration.  Skip.
             */
            if (tf->command == ATA_CMD_SET_FEATURES &&
                tf->feature == SETFEATURES_XFER)
                  return 1;
      }

      if (ata_acpi_gtf_filter & ATA_ACPI_FILTER_LOCK) {
            /* BIOS writers, sorry but we don't wanna lock
             * features unless the user explicitly said so.
             */

            /* DEVICE CONFIGURATION FREEZE LOCK */
            if (tf->command == ATA_CMD_CONF_OVERLAY &&
                tf->feature == ATA_DCO_FREEZE_LOCK)
                  return 1;

            /* SECURITY FREEZE LOCK */
            if (tf->command == ATA_CMD_SEC_FREEZE_LOCK)
                  return 1;

            /* SET MAX LOCK and SET MAX FREEZE LOCK */
            if ((!ptf || ptf->command != ATA_CMD_READ_NATIVE_MAX) &&
                tf->command == ATA_CMD_SET_MAX &&
                (tf->feature == ATA_SET_MAX_LOCK ||
                 tf->feature == ATA_SET_MAX_FREEZE_LOCK))
                  return 1;
      }

      return 0;
}

/**
 * ata_acpi_run_tf - send taskfile registers to host controller
 * @dev: target ATA device
 * @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7)
 *
 * Outputs ATA taskfile to standard ATA host controller using MMIO
 * or PIO as indicated by the ATA_FLAG_MMIO flag.
 * Writes the control, feature, nsect, lbal, lbam, and lbah registers.
 * Optionally (ATA_TFLAG_LBA48) writes hob_feature, hob_nsect,
 * hob_lbal, hob_lbam, and hob_lbah.
 *
 * This function waits for idle (!BUSY and !DRQ) after writing
 * registers.  If the control register has a new value, this
 * function also waits for idle after writing control and before
 * writing the remaining registers.
 *
 * LOCKING:
 * EH context.
 *
 * RETURNS:
 * 1 if command is executed successfully.  0 if ignored, rejected or
 * filtered out, -errno on other errors.
 */
static int ata_acpi_run_tf(struct ata_device *dev,
                     const struct ata_acpi_gtf *gtf,
                     const struct ata_acpi_gtf *prev_gtf)
{
      struct ata_taskfile *pptf = NULL;
      struct ata_taskfile tf, ptf, rtf;
      unsigned int err_mask;
      const char *level;
      char msg[60];
      int rc;

      if ((gtf->tf[0] == 0) && (gtf->tf[1] == 0) && (gtf->tf[2] == 0)
          && (gtf->tf[3] == 0) && (gtf->tf[4] == 0) && (gtf->tf[5] == 0)
          && (gtf->tf[6] == 0))
            return 0;

      ata_acpi_gtf_to_tf(dev, gtf, &tf);
      if (prev_gtf) {
            ata_acpi_gtf_to_tf(dev, prev_gtf, &ptf);
            pptf = &ptf;
      }

      if (!ata_acpi_filter_tf(&tf, pptf)) {
            rtf = tf;
            err_mask = ata_exec_internal(dev, &rtf, NULL,
                                   DMA_NONE, NULL, 0, 0);

            switch (err_mask) {
            case 0:
                  level = KERN_DEBUG;
                  snprintf(msg, sizeof(msg), "succeeded");
                  rc = 1;
                  break;

            case AC_ERR_DEV:
                  level = KERN_INFO;
                  snprintf(msg, sizeof(msg),
                         "rejected by device (Stat=0x%02x Err=0x%02x)",
                         rtf.command, rtf.feature);
                  rc = 0;
                  break;

            default:
                  level = KERN_ERR;
                  snprintf(msg, sizeof(msg),
                         "failed (Emask=0x%x Stat=0x%02x Err=0x%02x)",
                         err_mask, rtf.command, rtf.feature);
                  rc = -EIO;
                  break;
            }
      } else {
            level = KERN_INFO;
            snprintf(msg, sizeof(msg), "filtered out");
            rc = 0;
      }

      ata_dev_printk(dev, level,
                   "ACPI cmd %02x/%02x:%02x:%02x:%02x:%02x:%02x %s\n",
                   tf.command, tf.feature, tf.nsect, tf.lbal,
                   tf.lbam, tf.lbah, tf.device, msg);

      return rc;
}

/**
 * ata_acpi_exec_tfs - get then write drive taskfile settings
 * @dev: target ATA device
 * @nr_executed: out paramter for the number of executed commands
 *
 * Evaluate _GTF and excute returned taskfiles.
 *
 * LOCKING:
 * EH context.
 *
 * RETURNS:
 * Number of executed taskfiles on success, 0 if _GTF doesn't exist.
 * -errno on other errors.
 */
static int ata_acpi_exec_tfs(struct ata_device *dev, int *nr_executed)
{
      struct ata_acpi_gtf *gtf = NULL, *pgtf = NULL;
      int gtf_count, i, rc;

      /* get taskfiles */
      rc = ata_dev_get_GTF(dev, &gtf);
      if (rc < 0)
            return rc;
      gtf_count = rc;

      /* execute them */
      for (i = 0; i < gtf_count; i++, gtf++) {
            rc = ata_acpi_run_tf(dev, gtf, pgtf);
            if (rc < 0)
                  break;
            if (rc) {
                  (*nr_executed)++;
                  pgtf = gtf;
            }
      }

      ata_acpi_clear_gtf(dev);

      if (rc < 0)
            return rc;
      return 0;
}

/**
 * ata_acpi_push_id - send Identify data to drive
 * @dev: target ATA device
 *
 * _SDD ACPI object: for SATA mode only
 * Must be after Identify (Packet) Device -- uses its data
 * ATM this function never returns a failure.  It is an optional
 * method and if it fails for whatever reason, we should still
 * just keep going.
 *
 * LOCKING:
 * EH context.
 *
 * RETURNS:
 * 0 on success, -errno on failure.
 */
static int ata_acpi_push_id(struct ata_device *dev)
{
      struct ata_port *ap = dev->link->ap;
      int err;
      acpi_status status;
      struct acpi_object_list input;
      union acpi_object in_params[1];

      if (ata_msg_probe(ap))
            ata_dev_printk(dev, KERN_DEBUG, "%s: ix = %d, port#: %d\n",
                         __FUNCTION__, dev->devno, ap->port_no);

      /* Give the drive Identify data to the drive via the _SDD method */
      /* _SDD: set up input parameters */
      input.count = 1;
      input.pointer = in_params;
      in_params[0].type = ACPI_TYPE_BUFFER;
      in_params[0].buffer.length = sizeof(dev->id[0]) * ATA_ID_WORDS;
      in_params[0].buffer.pointer = (u8 *)dev->id;
      /* Output buffer: _SDD has no output */

      /* It's OK for _SDD to be missing too. */
      swap_buf_le16(dev->id, ATA_ID_WORDS);
      status = acpi_evaluate_object(dev->acpi_handle, "_SDD", &input, NULL);
      swap_buf_le16(dev->id, ATA_ID_WORDS);

      err = ACPI_FAILURE(status) ? -EIO : 0;
      if (err < 0)
            ata_dev_printk(dev, KERN_WARNING,
                         "ACPI _SDD failed (AE 0x%x)\n", status);

      return err;
}

/**
 * ata_acpi_on_suspend - ATA ACPI hook called on suspend
 * @ap: target ATA port
 *
 * This function is called when @ap is about to be suspended.  All
 * devices are already put to sleep but the port_suspend() callback
 * hasn't been executed yet.  Error return from this function aborts
 * suspend.
 *
 * LOCKING:
 * EH context.
 *
 * RETURNS:
 * 0 on success, -errno on failure.
 */
int ata_acpi_on_suspend(struct ata_port *ap)
{
      /* nada */
      return 0;
}

/**
 * ata_acpi_on_resume - ATA ACPI hook called on resume
 * @ap: target ATA port
 *
 * This function is called when @ap is resumed - right after port
 * itself is resumed but before any EH action is taken.
 *
 * LOCKING:
 * EH context.
 */
void ata_acpi_on_resume(struct ata_port *ap)
{
      const struct ata_acpi_gtm *gtm = ata_acpi_init_gtm(ap);
      struct ata_device *dev;

      if (ap->acpi_handle && gtm) {
            /* _GTM valid */

            /* restore timing parameters */
            ata_acpi_stm(ap, gtm);

            /* _GTF should immediately follow _STM so that it can
             * use values set by _STM.  Cache _GTF result and
             * schedule _GTF.
             */
            ata_link_for_each_dev(dev, &ap->link) {
                  ata_acpi_clear_gtf(dev);
                  if (ata_dev_get_GTF(dev, NULL) >= 0)
                        dev->flags |= ATA_DFLAG_ACPI_PENDING;
            }
      } else {
            /* SATA _GTF needs to be evaulated after _SDD and
             * there's no reason to evaluate IDE _GTF early
             * without _STM.  Clear cache and schedule _GTF.
             */
            ata_link_for_each_dev(dev, &ap->link) {
                  ata_acpi_clear_gtf(dev);
                  dev->flags |= ATA_DFLAG_ACPI_PENDING;
            }
      }
}

/**
 * ata_acpi_on_devcfg - ATA ACPI hook called on device donfiguration
 * @dev: target ATA device
 *
 * This function is called when @dev is about to be configured.
 * IDENTIFY data might have been modified after this hook is run.
 *
 * LOCKING:
 * EH context.
 *
 * RETURNS:
 * Positive number if IDENTIFY data needs to be refreshed, 0 if not,
 * -errno on failure.
 */
int ata_acpi_on_devcfg(struct ata_device *dev)
{
      struct ata_port *ap = dev->link->ap;
      struct ata_eh_context *ehc = &ap->link.eh_context;
      int acpi_sata = ap->flags & ATA_FLAG_ACPI_SATA;
      int nr_executed = 0;
      int rc;

      if (!dev->acpi_handle)
            return 0;

      /* do we need to do _GTF? */
      if (!(dev->flags & ATA_DFLAG_ACPI_PENDING) &&
          !(acpi_sata && (ehc->i.flags & ATA_EHI_DID_HARDRESET)))
            return 0;

      /* do _SDD if SATA */
      if (acpi_sata) {
            rc = ata_acpi_push_id(dev);
            if (rc)
                  goto acpi_err;
      }

      /* do _GTF */
      rc = ata_acpi_exec_tfs(dev, &nr_executed);
      if (rc)
            goto acpi_err;

      dev->flags &= ~ATA_DFLAG_ACPI_PENDING;

      /* refresh IDENTIFY page if any _GTF command has been executed */
      if (nr_executed) {
            rc = ata_dev_reread_id(dev, 0);
            if (rc < 0) {
                  ata_dev_printk(dev, KERN_ERR, "failed to IDENTIFY "
                               "after ACPI commands\n");
                  return rc;
            }
      }

      return 0;

 acpi_err:
      /* ignore evaluation failure if we can continue safely */
      if (rc == -EINVAL && !nr_executed && !(ap->pflags & ATA_PFLAG_FROZEN))
            return 0;

      /* fail and let EH retry once more for unknown IO errors */
      if (!(dev->flags & ATA_DFLAG_ACPI_FAILED)) {
            dev->flags |= ATA_DFLAG_ACPI_FAILED;
            return rc;
      }

      ata_dev_printk(dev, KERN_WARNING,
                   "ACPI: failed the second time, disabled\n");
      dev->acpi_handle = NULL;

      /* We can safely continue if no _GTF command has been executed
       * and port is not frozen.
       */
      if (!nr_executed && !(ap->pflags & ATA_PFLAG_FROZEN))
            return 0;

      return rc;
}

/**
 * ata_acpi_on_disable - ATA ACPI hook called when a device is disabled
 * @dev: target ATA device
 *
 * This function is called when @dev is about to be disabled.
 *
 * LOCKING:
 * EH context.
 */
void ata_acpi_on_disable(struct ata_device *dev)
{
      ata_acpi_clear_gtf(dev);
}

Generated by  Doxygen 1.6.0   Back to index