linux/drivers/ata/libata-acpi.c

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/*
* 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 cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
#include <linux/slab.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;
/*
* If acpi bind operation has already happened, we can get the handle
* for the port by checking the corresponding scsi_host device's
* firmware node, otherwise we will need to find out the handle from
* its parent's acpi node.
*/
if (ap->scsi_host)
return DEVICE_ACPI_HANDLE(&ap->scsi_host->shost_gendev);
else
return acpi_get_child(DEVICE_ACPI_HANDLE(ap->host->dev),
ap->port_no);
}
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 (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);
}
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,
};
/**
* 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);
}
}
/**
* 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(ata_ap_acpi_handle(ap), "_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;
}
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;
}
}
}
/**
* ata_acpi_set_state - set the port power state
* @ap: target ATA port
* @state: state, on/off
*
* This function executes the _PS0/_PS3 ACPI method to set the power state.
* ACPI spec requires _PS0 when IDE power on and _PS3 when power off
*/
void ata_acpi_set_state(struct ata_port *ap, pm_message_t state)
{
struct ata_device *dev;
if (!ata_ap_acpi_handle(ap) || (ap->flags & ATA_FLAG_ACPI_SATA))
return;
/* channel first and then drives for power on and vica versa
for power off */
if (state.event == PM_EVENT_ON)
acpi_bus_set_power(ata_ap_acpi_handle(ap), ACPI_STATE_D0);
ata_for_each_dev(dev, &ap->link, ENABLED) {
if (ata_dev_acpi_handle(dev))
acpi_bus_set_power(ata_dev_acpi_handle(dev),
state.event == PM_EVENT_ON ?
ACPI_STATE_D0 : ACPI_STATE_D3);
}
if (state.event != PM_EVENT_ON)
acpi_bus_set_power(ata_ap_acpi_handle(ap), ACPI_STATE_D3);
}
/**
* 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;
}
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 (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;
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)
ata_dev = &ap->link.device[sdev->channel];
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 int ata_acpi_find_dummy(struct device *dev, acpi_handle *handle)
{
return -ENODEV;
}
static struct acpi_bus_type ata_acpi_bus = {
.find_bridge = ata_acpi_find_dummy,
.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);
}