1 files changed, 1054 insertions, 0 deletions

diff --git a/kernel/drivers/ata/libata-acpi.c b/kernel/drivers/ata/libata-acpi.c
new file mode 100644
index 000000000..97a14fe47
--- /dev/null
+++ b/kernel/drivers/ata/libata-acpi.c
@@ -0,0 +1,1054 @@
+/*
+ * 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"
+
+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;
+
+static void ata_acpi_clear_gtf(struct ata_device *dev)
+{
+	kfree(dev->gtf_cache);
+	dev->gtf_cache = NULL;
+}
+
+struct ata_acpi_hotplug_context {
+	struct acpi_hotplug_context hp;
+	union {
+		struct ata_port *ap;
+		struct ata_device *dev;
+	} data;
+};
+
+#define ata_hotplug_data(context) (container_of((context), struct ata_acpi_hotplug_context, hp)->data)
+
+/**
+ * ata_dev_acpi_handle - provide the acpi_handle for an ata_device
+ * @dev: the acpi_handle returned will correspond to this device
+ *
+ * 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
+ * or ACPI is disabled for this device due to consecutive errors.
+ */
+acpi_handle ata_dev_acpi_handle(struct ata_device *dev)
+{
+	return dev->flags & ATA_DFLAG_ACPI_DISABLED ?
+			NULL : ACPI_HANDLE(&dev->tdev);
+}
+
+/* @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 int ata_acpi_dev_notify_dock(struct acpi_device *adev, u32 event)
+{
+	struct ata_device *dev = ata_hotplug_data(adev->hp).dev;
+	ata_acpi_handle_hotplug(dev->link->ap, dev, event);
+	return 0;
+}
+
+static int ata_acpi_ap_notify_dock(struct acpi_device *adev, u32 event)
+{
+	ata_acpi_handle_hotplug(ata_hotplug_data(adev->hp).ap, NULL, event);
+	return 0;
+}
+
+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(struct acpi_device *adev, u32 event)
+{
+	ata_acpi_uevent(ata_hotplug_data(adev->hp).ap, NULL, event);
+}
+
+static void ata_acpi_dev_uevent(struct acpi_device *adev, u32 event)
+{
+	struct ata_device *dev = ata_hotplug_data(adev->hp).dev;
+	ata_acpi_uevent(dev->link->ap, dev, event);
+}
+
+/* bind acpi handle to pata port */
+void ata_acpi_bind_port(struct ata_port *ap)
+{
+	struct acpi_device *host_companion = ACPI_COMPANION(ap->host->dev);
+	struct acpi_device *adev;
+	struct ata_acpi_hotplug_context *context;
+
+	if (libata_noacpi || ap->flags & ATA_FLAG_ACPI_SATA || !host_companion)
+		return;
+
+	acpi_preset_companion(&ap->tdev, host_companion, ap->port_no);
+
+	if (ata_acpi_gtm(ap, &ap->__acpi_init_gtm) == 0)
+		ap->pflags |= ATA_PFLAG_INIT_GTM_VALID;
+
+	adev = ACPI_COMPANION(&ap->tdev);
+	if (!adev || adev->hp)
+		return;
+
+	context = kzalloc(sizeof(*context), GFP_KERNEL);
+	if (!context)
+		return;
+
+	context->data.ap = ap;
+	acpi_initialize_hp_context(adev, &context->hp, ata_acpi_ap_notify_dock,
+				   ata_acpi_ap_uevent);
+}
+
+void ata_acpi_bind_dev(struct ata_device *dev)
+{
+	struct ata_port *ap = dev->link->ap;
+	struct acpi_device *port_companion = ACPI_COMPANION(&ap->tdev);
+	struct acpi_device *host_companion = ACPI_COMPANION(ap->host->dev);
+	struct acpi_device *parent, *adev;
+	struct ata_acpi_hotplug_context *context;
+	u64 adr;
+
+	/*
+	 * For both sata/pata devices, host companion device is required.
+	 * For pata device, port companion device is also required.
+	 */
+	if (libata_noacpi || !host_companion ||
+			(!(ap->flags & ATA_FLAG_ACPI_SATA) && !port_companion))
+		return;
+
+	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);
+		parent = host_companion;
+	} else {
+		adr = dev->devno;
+		parent = port_companion;
+	}
+
+	acpi_preset_companion(&dev->tdev, parent, adr);
+	adev = ACPI_COMPANION(&dev->tdev);
+	if (!adev || adev->hp)
+		return;
+
+	context = kzalloc(sizeof(*context), GFP_KERNEL);
+	if (!context)
+		return;
+
+	context->data.dev = dev;
+	acpi_initialize_hp_context(adev, &context->hp, ata_acpi_dev_notify_dock,
+				   ata_acpi_dev_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 (ACPI_HANDLE(&ap->tdev) && 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;
+	acpi_handle handle = ACPI_HANDLE(&ap->tdev);
+
+	if (!handle)
+		return -EINVAL;
+
+	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;
+}
+
+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(ACPI_HANDLE(&ap->tdev), "_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 (ACPI_HANDLE(&ap->tdev) && 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_acpi_handle(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->tdev, 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 = ACPI_HANDLE(&ap->tdev);
+	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_COLD);
+	}
+
+	if (!(state.event & PM_EVENT_RESUME))
+		acpi_bus_set_power(port_handle, ACPI_STATE_D3_COLD);
+}
+
+/**
+ * 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);
+}