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linux-next/drivers/ata/libata-acpi.c
Aaron Lu 44521527be libata-acpi: add back ACPI based hotplug functionality
Commit 30dcf76acc "libata: migrate ACPI code over to new bindings"
mistakenly dropped the code to register hotplug notificaion handler
for ATA port/devices, causing regression for people using ATA bay,
as kernel bug #59871 shows.

Fix this by adding back the hotplug notification handler registration
code.  Since this code has to be run once and notification needs to
be installed on every ATA port/devices handle no matter if there is
actual device attached, we can't do this in binding time for ATA
device ACPI handle, as the binding only occurs when a SCSI device is
created, i.e. there is device attached.  So introduce the
ata_acpi_hotplug_init() function to loop scan all ATA ACPI handles
and if it is available, install the notificaion handler for it during
ATA init time.

With the ATA ACPI handle binding to SCSI device tree, it is possible
now that when the SCSI hotplug work removes the SCSI device, the ACPI
unbind function will find that the corresponding ACPI device has
already been deleted by dock driver, causing a scaring message like:
[  128.263966] scsi 4:0:0:0: Oops, 'acpi_handle' corrupt
Fix this by waiting for SCSI hotplug task finish in our notificaion
handler, so that the removal of ACPI device done in ACPI unbind
function triggered by the removal of SCSI device is run earlier when
ACPI device is still available.

[rjw: Rebased]
References: https://bugzilla.kernel.org/show_bug.cgi?id=59871
Reported-bisected-and-tested-by: Dirk Griesbach <spamthis@freenet.de>
Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: 3.6+ <stable@vger.kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-06-25 00:51:33 +02:00

1172 lines
28 KiB
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 <linux/slab.h>
#include <linux/pm_runtime.h>
#include <scsi/scsi_device.h>
#include "libata.h"
#include <acpi/acpi_bus.h>
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, 0x4=DIPM, 0x8=FPDMA non-zero offset, 0x10=FPDMA DMA Setup FIS auto-activate)");
#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_ap_acpi_handle - provide the acpi_handle for an ata_port
* @ap: the acpi_handle returned will correspond to this port
*
* Returns the acpi_handle for the ACPI namespace object corresponding to
* the ata_port passed into the function, or NULL if no such object exists
*/
acpi_handle ata_ap_acpi_handle(struct ata_port *ap)
{
if (ap->flags & ATA_FLAG_ACPI_SATA)
return NULL;
return ap->scsi_host ?
DEVICE_ACPI_HANDLE(&ap->scsi_host->shost_gendev) : NULL;
}
EXPORT_SYMBOL(ata_ap_acpi_handle);
/**
* ata_dev_acpi_handle - provide the acpi_handle for an ata_device
* @dev: the acpi_device returned will correspond to this port
*
* Returns the acpi_handle for the ACPI namespace object corresponding to
* the ata_device passed into the function, or NULL if no such object exists
*/
acpi_handle ata_dev_acpi_handle(struct ata_device *dev)
{
acpi_integer adr;
struct ata_port *ap = dev->link->ap;
if (libata_noacpi || dev->flags & ATA_DFLAG_ACPI_DISABLED)
return NULL;
if (ap->flags & ATA_FLAG_ACPI_SATA) {
if (!sata_pmp_attached(ap))
adr = SATA_ADR(ap->port_no, NO_PORT_MULT);
else
adr = SATA_ADR(ap->port_no, dev->link->pmp);
return acpi_get_child(DEVICE_ACPI_HANDLE(ap->host->dev), adr);
} else
return acpi_get_child(ata_ap_acpi_handle(ap), dev->devno);
}
EXPORT_SYMBOL(ata_dev_acpi_handle);
/* @ap and @dev are the same as ata_acpi_handle_hotplug() */
static void ata_acpi_detach_device(struct ata_port *ap, struct ata_device *dev)
{
if (dev)
dev->flags |= ATA_DFLAG_DETACH;
else {
struct ata_link *tlink;
struct ata_device *tdev;
ata_for_each_link(tlink, ap, EDGE)
ata_for_each_dev(tdev, tlink, ALL)
tdev->flags |= ATA_DFLAG_DETACH;
}
ata_port_schedule_eh(ap);
}
/**
* ata_acpi_handle_hotplug - ACPI event handler backend
* @ap: ATA port ACPI event occurred
* @dev: ATA device ACPI event occurred (can be NULL)
* @event: ACPI event which occurred
*
* All ACPI bay / device realted events end up in this function. If
* the event is port-wide @dev is NULL. If the event is specific to a
* device, @dev points to it.
*
* Hotplug (as opposed to unplug) notification is always handled as
* port-wide while unplug only kills the target device on device-wide
* event.
*
* LOCKING:
* ACPI notify handler context. May sleep.
*/
static void ata_acpi_handle_hotplug(struct ata_port *ap, struct ata_device *dev,
u32 event)
{
struct ata_eh_info *ehi = &ap->link.eh_info;
int wait = 0;
unsigned long flags;
spin_lock_irqsave(ap->lock, flags);
/*
* When dock driver calls into the routine, it will always use
* ACPI_NOTIFY_BUS_CHECK/ACPI_NOTIFY_DEVICE_CHECK for add and
* ACPI_NOTIFY_EJECT_REQUEST for remove
*/
switch (event) {
case ACPI_NOTIFY_BUS_CHECK:
case ACPI_NOTIFY_DEVICE_CHECK:
ata_ehi_push_desc(ehi, "ACPI event");
ata_ehi_hotplugged(ehi);
ata_port_freeze(ap);
break;
case ACPI_NOTIFY_EJECT_REQUEST:
ata_ehi_push_desc(ehi, "ACPI event");
ata_acpi_detach_device(ap, dev);
wait = 1;
break;
}
spin_unlock_irqrestore(ap->lock, flags);
if (wait) {
ata_port_wait_eh(ap);
flush_work(&ap->hotplug_task.work);
}
}
static void ata_acpi_dev_notify_dock(acpi_handle handle, u32 event, void *data)
{
struct ata_device *dev = data;
ata_acpi_handle_hotplug(dev->link->ap, dev, event);
}
static void ata_acpi_ap_notify_dock(acpi_handle handle, u32 event, void *data)
{
struct ata_port *ap = data;
ata_acpi_handle_hotplug(ap, NULL, event);
}
static void ata_acpi_uevent(struct ata_port *ap, struct ata_device *dev,
u32 event)
{
struct kobject *kobj = NULL;
char event_string[20];
char *envp[] = { event_string, NULL };
if (dev) {
if (dev->sdev)
kobj = &dev->sdev->sdev_gendev.kobj;
} else
kobj = &ap->dev->kobj;
if (kobj) {
snprintf(event_string, 20, "BAY_EVENT=%d", event);
kobject_uevent_env(kobj, KOBJ_CHANGE, envp);
}
}
static void ata_acpi_ap_uevent(acpi_handle handle, u32 event, void *data)
{
ata_acpi_uevent(data, NULL, event);
}
static void ata_acpi_dev_uevent(acpi_handle handle, u32 event, void *data)
{
struct ata_device *dev = data;
ata_acpi_uevent(dev->link->ap, dev, event);
}
static const struct acpi_dock_ops ata_acpi_dev_dock_ops = {
.handler = ata_acpi_dev_notify_dock,
.uevent = ata_acpi_dev_uevent,
};
static const struct acpi_dock_ops ata_acpi_ap_dock_ops = {
.handler = ata_acpi_ap_notify_dock,
.uevent = ata_acpi_ap_uevent,
};
void ata_acpi_hotplug_init(struct ata_host *host)
{
int i;
for (i = 0; i < host->n_ports; i++) {
struct ata_port *ap = host->ports[i];
acpi_handle handle;
struct ata_device *dev;
if (!ap)
continue;
handle = ata_ap_acpi_handle(ap);
if (handle) {
/* we might be on a docking station */
register_hotplug_dock_device(handle,
&ata_acpi_ap_dock_ops, ap,
NULL, NULL);
}
ata_for_each_dev(dev, &ap->link, ALL) {
handle = ata_dev_acpi_handle(dev);
if (!handle)
continue;
/* we might be on a docking station */
register_hotplug_dock_device(handle,
&ata_acpi_dev_dock_ops,
dev, NULL, NULL);
}
}
}
/**
* 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 (ata_ap_acpi_handle(ap) && gtm)
ata_acpi_stm(ap, gtm);
}
}
static int __ata_acpi_gtm(struct ata_port *ap, acpi_handle handle,
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(handle, "_GTM", NULL, &output);
rc = -ENOENT;
if (status == AE_NOT_FOUND)
goto out_free;
rc = -EINVAL;
if (ACPI_FAILURE(status)) {
ata_port_err(ap, "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_warn(ap, "_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_err(ap, "_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;
}
/**
* 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)
{
if (ata_ap_acpi_handle(ap))
return __ata_acpi_gtm(ap, ata_ap_acpi_handle(ap), gtm);
else
return -EINVAL;
}
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(ata_ap_acpi_handle(ap), "_STM", &input,
NULL);
if (status == AE_NOT_FOUND)
return -ENOENT;
if (ACPI_FAILURE(status)) {
ata_port_err(ap, "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_dbg(dev, "%s: ENTER: port#: %d\n",
__func__, ap->port_no);
/* _GTF has no input parameters */
status = acpi_evaluate_object(ata_dev_acpi_handle(dev), "_GTF", NULL,
&output);
out_obj = dev->gtf_cache = output.pointer;
if (ACPI_FAILURE(status)) {
if (status != AE_NOT_FOUND) {
ata_dev_warn(dev, "_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_dbg(dev, "%s: Run _GTF: length or ptr is NULL (0x%llx, 0x%p)\n",
__func__,
(unsigned long long)output.length,
output.pointer);
rc = -EINVAL;
goto out_free;
}
if (out_obj->type != ACPI_TYPE_BUFFER) {
ata_dev_warn(dev, "_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_warn(dev, "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_dbg(dev, "%s: returning gtf=%p, gtf_count=%d\n",
__func__, *gtf, rc);
}
return rc;
out_free:
ata_acpi_clear_gtf(dev);
return rc;
}
/**
* ata_acpi_gtm_xfermode - determine xfermode from GTM parameter
* @dev: target device
* @gtm: GTM parameter to use
*
* Determine xfermask for @dev from @gtm.
*
* LOCKING:
* None.
*
* RETURNS:
* Determined xfermask.
*/
unsigned long ata_acpi_gtm_xfermask(struct ata_device *dev,
const struct ata_acpi_gtm *gtm)
{
unsigned long xfer_mask = 0;
unsigned int type;
int unit;
u8 mode;
/* we always use the 0 slot for crap hardware */
unit = dev->devno;
if (!(gtm->flags & 0x10))
unit = 0;
/* PIO */
mode = ata_timing_cycle2mode(ATA_SHIFT_PIO, gtm->drive[unit].pio);
xfer_mask |= ata_xfer_mode2mask(mode);
/* See if we have MWDMA or UDMA data. We don't bother with
* MWDMA if UDMA is available as this means the BIOS set UDMA
* and our error changedown if it works is UDMA to PIO anyway.
*/
if (!(gtm->flags & (1 << (2 * unit))))
type = ATA_SHIFT_MWDMA;
else
type = ATA_SHIFT_UDMA;
mode = ata_timing_cycle2mode(type, gtm->drive[unit].dma);
xfer_mask |= ata_xfer_mode2mask(mode);
return xfer_mask;
}
EXPORT_SYMBOL_GPL(ata_acpi_gtm_xfermask);
/**
* ata_acpi_cbl_80wire - Check for 80 wire cable
* @ap: Port to check
* @gtm: GTM data to use
*
* Return 1 if the @gtm indicates the BIOS selected an 80wire mode.
*/
int ata_acpi_cbl_80wire(struct ata_port *ap, const struct ata_acpi_gtm *gtm)
{
struct ata_device *dev;
ata_for_each_dev(dev, &ap->link, ENABLED) {
unsigned long xfer_mask, udma_mask;
xfer_mask = ata_acpi_gtm_xfermask(dev, gtm);
ata_unpack_xfermask(xfer_mask, NULL, NULL, &udma_mask);
if (udma_mask & ~ATA_UDMA_MASK_40C)
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(struct ata_device *dev,
const struct ata_taskfile *tf,
const struct ata_taskfile *ptf)
{
if (dev->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 (dev->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;
}
if (tf->command == ATA_CMD_SET_FEATURES &&
tf->feature == SETFEATURES_SATA_ENABLE) {
/* inhibit enabling DIPM */
if (dev->gtf_filter & ATA_ACPI_FILTER_DIPM &&
tf->nsect == SATA_DIPM)
return 1;
/* inhibit FPDMA non-zero offset */
if (dev->gtf_filter & ATA_ACPI_FILTER_FPDMA_OFFSET &&
(tf->nsect == SATA_FPDMA_OFFSET ||
tf->nsect == SATA_FPDMA_IN_ORDER))
return 1;
/* inhibit FPDMA auto activation */
if (dev->gtf_filter & ATA_ACPI_FILTER_FPDMA_AA &&
tf->nsect == SATA_FPDMA_AA)
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.
* 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;
const char *descr;
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(dev, &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;
}
descr = ata_get_cmd_descript(tf.command);
ata_dev_printk(dev, level,
"ACPI cmd %02x/%02x:%02x:%02x:%02x:%02x:%02x (%s) %s\n",
tf.command, tf.feature, tf.nsect, tf.lbal,
tf.lbam, tf.lbah, tf.device,
(descr ? descr : "unknown"), msg);
return rc;
}
/**
* ata_acpi_exec_tfs - get then write drive taskfile settings
* @dev: target ATA device
* @nr_executed: out parameter for the number of executed commands
*
* Evaluate _GTF and execute 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, -ENOENT if _SDD doesn't exist, -errno on failure.
*/
static int ata_acpi_push_id(struct ata_device *dev)
{
struct ata_port *ap = dev->link->ap;
acpi_status status;
struct acpi_object_list input;
union acpi_object in_params[1];
if (ata_msg_probe(ap))
ata_dev_dbg(dev, "%s: ix = %d, port#: %d\n",
__func__, 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(ata_dev_acpi_handle(dev), "_SDD", &input,
NULL);
swap_buf_le16(dev->id, ATA_ID_WORDS);
if (status == AE_NOT_FOUND)
return -ENOENT;
if (ACPI_FAILURE(status)) {
ata_dev_warn(dev, "ACPI _SDD failed (AE 0x%x)\n", status);
return -EIO;
}
return 0;
}
/**
* 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 (ata_ap_acpi_handle(ap) && 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_for_each_dev(dev, &ap->link, ALL) {
ata_acpi_clear_gtf(dev);
if (ata_dev_enabled(dev) &&
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_for_each_dev(dev, &ap->link, ALL) {
ata_acpi_clear_gtf(dev);
if (ata_dev_enabled(dev))
dev->flags |= ATA_DFLAG_ACPI_PENDING;
}
}
}
static int ata_acpi_choose_suspend_state(struct ata_device *dev, bool runtime)
{
int d_max_in = ACPI_STATE_D3_COLD;
if (!runtime)
goto out;
/*
* For ATAPI, runtime D3 cold is only allowed
* for ZPODD in zero power ready state
*/
if (dev->class == ATA_DEV_ATAPI &&
!(zpodd_dev_enabled(dev) && zpodd_zpready(dev)))
d_max_in = ACPI_STATE_D3_HOT;
out:
return acpi_pm_device_sleep_state(&dev->sdev->sdev_gendev,
NULL, d_max_in);
}
static void sata_acpi_set_state(struct ata_port *ap, pm_message_t state)
{
bool runtime = PMSG_IS_AUTO(state);
struct ata_device *dev;
acpi_handle handle;
int acpi_state;
ata_for_each_dev(dev, &ap->link, ENABLED) {
handle = ata_dev_acpi_handle(dev);
if (!handle)
continue;
if (!(state.event & PM_EVENT_RESUME)) {
acpi_state = ata_acpi_choose_suspend_state(dev, runtime);
if (acpi_state == ACPI_STATE_D0)
continue;
if (runtime && zpodd_dev_enabled(dev) &&
acpi_state == ACPI_STATE_D3_COLD)
zpodd_enable_run_wake(dev);
acpi_bus_set_power(handle, acpi_state);
} else {
if (runtime && zpodd_dev_enabled(dev))
zpodd_disable_run_wake(dev);
acpi_bus_set_power(handle, ACPI_STATE_D0);
}
}
}
/* ACPI spec requires _PS0 when IDE power on and _PS3 when power off */
static void pata_acpi_set_state(struct ata_port *ap, pm_message_t state)
{
struct ata_device *dev;
acpi_handle port_handle;
port_handle = ata_ap_acpi_handle(ap);
if (!port_handle)
return;
/* channel first and then drives for power on and vica versa
for power off */
if (state.event & PM_EVENT_RESUME)
acpi_bus_set_power(port_handle, ACPI_STATE_D0);
ata_for_each_dev(dev, &ap->link, ENABLED) {
acpi_handle dev_handle = ata_dev_acpi_handle(dev);
if (!dev_handle)
continue;
acpi_bus_set_power(dev_handle, state.event & PM_EVENT_RESUME ?
ACPI_STATE_D0 : ACPI_STATE_D3);
}
if (!(state.event & PM_EVENT_RESUME))
acpi_bus_set_power(port_handle, ACPI_STATE_D3);
}
/**
* ata_acpi_set_state - set the port power state
* @ap: target ATA port
* @state: state, on/off
*
* This function sets a proper ACPI D state for the device on
* system and runtime PM operations.
*/
void ata_acpi_set_state(struct ata_port *ap, pm_message_t state)
{
if (ap->flags & ATA_FLAG_ACPI_SATA)
sata_acpi_set_state(ap, state);
else
pata_acpi_set_state(ap, state);
}
/**
* 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 (!ata_dev_acpi_handle(dev))
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 && rc != -ENOENT)
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_err(dev,
"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;
}
dev->flags |= ATA_DFLAG_ACPI_DISABLED;
ata_dev_warn(dev, "ACPI: failed the second time, disabled\n");
/* 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);
}
static int compat_pci_ata(struct ata_port *ap)
{
struct device *dev = ap->tdev.parent;
struct pci_dev *pdev;
if (!is_pci_dev(dev))
return 0;
pdev = to_pci_dev(dev);
if ((pdev->class >> 8) != PCI_CLASS_STORAGE_SATA &&
(pdev->class >> 8) != PCI_CLASS_STORAGE_IDE)
return 0;
return 1;
}
static int ata_acpi_bind_host(struct ata_port *ap, acpi_handle *handle)
{
if (libata_noacpi || ap->flags & ATA_FLAG_ACPI_SATA)
return -ENODEV;
*handle = acpi_get_child(DEVICE_ACPI_HANDLE(ap->tdev.parent),
ap->port_no);
if (!*handle)
return -ENODEV;
if (__ata_acpi_gtm(ap, *handle, &ap->__acpi_init_gtm) == 0)
ap->pflags |= ATA_PFLAG_INIT_GTM_VALID;
return 0;
}
static int ata_acpi_bind_device(struct ata_port *ap, struct scsi_device *sdev,
acpi_handle *handle)
{
struct ata_device *ata_dev;
if (ap->flags & ATA_FLAG_ACPI_SATA) {
if (!sata_pmp_attached(ap))
ata_dev = &ap->link.device[sdev->id];
else
ata_dev = &ap->pmp_link[sdev->channel].device[sdev->id];
}
else {
ata_dev = &ap->link.device[sdev->id];
}
*handle = ata_dev_acpi_handle(ata_dev);
if (!*handle)
return -ENODEV;
return 0;
}
static int is_ata_port(const struct device *dev)
{
return dev->type == &ata_port_type;
}
static struct ata_port *dev_to_ata_port(struct device *dev)
{
while (!is_ata_port(dev)) {
if (!dev->parent)
return NULL;
dev = dev->parent;
}
return to_ata_port(dev);
}
static int ata_acpi_find_device(struct device *dev, acpi_handle *handle)
{
struct ata_port *ap = dev_to_ata_port(dev);
if (!ap)
return -ENODEV;
if (!compat_pci_ata(ap))
return -ENODEV;
if (scsi_is_host_device(dev))
return ata_acpi_bind_host(ap, handle);
else if (scsi_is_sdev_device(dev)) {
struct scsi_device *sdev = to_scsi_device(dev);
return ata_acpi_bind_device(ap, sdev, handle);
} else
return -ENODEV;
}
static struct acpi_bus_type ata_acpi_bus = {
.name = "ATA",
.find_device = ata_acpi_find_device,
};
int ata_acpi_register(void)
{
return scsi_register_acpi_bus_type(&ata_acpi_bus);
}
void ata_acpi_unregister(void)
{
scsi_unregister_acpi_bus_type(&ata_acpi_bus);
}