[PATCH] libata: ACPI and _GTF support

_GTF is an acpi method that is used to reinitialize the drive. It returns a task file containing ata commands that are sent back to the drive to restore it to boot up defaults. Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com> Signed-off-by: Jeff Garzik <jeff@garzik.org> (cherry picked from 9c69cab24b51a89664f4c0dfaf8a436d32117624 commit)

[PATCH] libata: ACPI and _GTF support
_GTF is an acpi method that is used to reinitialize the drive. It returns a task file containing ata commands that are sent back to the drive to restore it to boot up defaults. Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com> Signed-off-by: Jeff Garzik <jeff@garzik.org> (cherry picked from 9c69cab24b51a89664f4c0dfaf8a436d32117624 commit)
Kristen Carlson Accardi · Jeff Garzik
1 parent 8a03d9a498
Showing 7 changed files with 643 additions and 1 deletions Side-by-side Diff
Documentation/kernel-parameters.txt
drivers/ata/Kconfig
drivers/ata/Makefile
drivers/ata/libata-acpi.c
drivers/ata/libata-core.c
drivers/ata/libata.h
include/linux/libata.h
@@ -48,6 +48,7 @@
 	ISAPNP	ISA PnP code is enabled.
 	ISDN	Appropriate ISDN support is enabled.
 	JOY	Appropriate joystick support is enabled.
+	LIBATA  Libata driver is enabled
 	LP	Printer support is enabled.
 	LOOP	Loopback device support is enabled.
 	M68k	M68k architecture is enabled.
@@ -1037,6 +1038,10 @@
 	no387		[BUGS=IA-32] Tells the kernel to use the 387 maths
 			emulation library even if a 387 maths coprocessor
 			is present.
+
+	noacpi		[LIBATA] Disables use of ACPI in libata suspend/resume
+			when set.
+			Format: <int>
  
 	noaliencache	[MM, NUMA] Disables the allcoation of alien caches in
 			the slab allocator.  Saves per-node memory, but will
@@ -161,6 +161,19 @@
 	depends on IDE=y && !BLK_DEV_IDE_SATA && (SATA_AHCI || ATA_PIIX)
 	default y
  
+config SATA_ACPI
+	bool
+	depends on ACPI && PCI
+	default y
+	help
+	  This option adds support for SATA-related ACPI objects.
+	  These ACPI objects add the ability to retrieve taskfiles
+	  from the ACPI BIOS and write them to the disk controller.
+	  These objects may be related to performance, security,
+	  power management, or other areas.
+	  You can disable this at kernel boot time by using the
+	  option libata.noacpi=1
+
 config PATA_ALI
 	tristate "ALi PATA support (Experimental)"
 	depends on PCI && EXPERIMENTAL
@@ -66,4 +66,5 @@
 obj-$(CONFIG_PATA_LEGACY)	+= pata_legacy.o
  
 libata-objs	:= libata-core.o libata-scsi.o libata-sff.o libata-eh.o
+libata-$(CONFIG_SATA_ACPI) += libata-acpi.o
+/*
+ * libata-acpi.c
+ * Provides ACPI support for PATA/SATA.
+ *
+ * Copyright (C) 2006 Intel Corp.
+ * Copyright (C) 2006 Randy Dunlap
+ */
+
+#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 "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>
+
+#define SATA_ROOT_PORT(x)	(((x) >> 16) & 0xffff)
+#define SATA_PORT_NUMBER(x)	((x) & 0xffff)	/* or NO_PORT_MULT */
+#define NO_PORT_MULT		0xffff
+#define SATA_ADR_RSVD		0xffffffff
+
+#define REGS_PER_GTF		7
+struct taskfile_array {
+	u8	tfa[REGS_PER_GTF];	/* regs. 0x1f1 - 0x1f7 */
+};
+
+
+/**
+ * sata_get_dev_handle - finds acpi_handle and PCI device.function
+ * @dev: device to locate
+ * @handle: returned acpi_handle for @dev
+ * @pcidevfn: return PCI device.func for @dev
+ *
+ * This function is somewhat SATA-specific.  Or at least the
+ * PATA & SATA versions of this function are different,
+ * so it's not entirely generic code.
+ *
+ * Returns 0 on success, <0 on error.
+ */
+static int sata_get_dev_handle(struct device *dev, acpi_handle *handle,
+					acpi_integer *pcidevfn)
+{
+	struct pci_dev	*pci_dev;
+	acpi_integer	addr;
+
+	pci_dev = to_pci_dev(dev);	/* NOTE: PCI-specific */
+	/* Please refer to the ACPI spec for the syntax of _ADR. */
+	addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
+	*pcidevfn = addr;
+	*handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
+	if (!*handle)
+		return -ENODEV;
+	return 0;
+}
+
+/**
+ * pata_get_dev_handle - finds acpi_handle and PCI device.function
+ * @dev: device to locate
+ * @handle: returned acpi_handle for @dev
+ * @pcidevfn: return PCI device.func for @dev
+ *
+ * The PATA and SATA versions of this function are different.
+ *
+ * Returns 0 on success, <0 on error.
+ */
+static int pata_get_dev_handle(struct device *dev, acpi_handle *handle,
+				acpi_integer *pcidevfn)
+{
+	unsigned int bus, devnum, func;
+	acpi_integer addr;
+	acpi_handle dev_handle, parent_handle;
+	struct acpi_buffer buffer = {.length = ACPI_ALLOCATE_BUFFER,
+					.pointer = NULL};
+	acpi_status status;
+	struct acpi_device_info	*dinfo = NULL;
+	int ret = -ENODEV;
+	struct pci_dev *pdev = to_pci_dev(dev);
+
+	bus = pdev->bus->number;
+	devnum = PCI_SLOT(pdev->devfn);
+	func = PCI_FUNC(pdev->devfn);
+
+	dev_handle = DEVICE_ACPI_HANDLE(dev);
+	parent_handle = DEVICE_ACPI_HANDLE(dev->parent);
+
+	status = acpi_get_object_info(parent_handle, &buffer);
+	if (ACPI_FAILURE(status))
+		goto err;
+
+	dinfo = buffer.pointer;
+	if (dinfo && (dinfo->valid & ACPI_VALID_ADR) &&
+	    dinfo->address == bus) {
+		/* ACPI spec for _ADR for PCI bus: */
+		addr = (acpi_integer)(devnum << 16 | func);
+		*pcidevfn = addr;
+		*handle = dev_handle;
+	} else {
+		goto err;
+	}
+
+	if (!*handle)
+		goto err;
+	ret = 0;
+err:
+	kfree(dinfo);
+	return ret;
+}
+
+struct walk_info {		/* can be trimmed some */
+	struct device	*dev;
+	struct acpi_device *adev;
+	acpi_handle	handle;
+	acpi_integer	pcidevfn;
+	unsigned int	drivenum;
+	acpi_handle	obj_handle;
+	struct ata_port *ataport;
+	struct ata_device *atadev;
+	u32		sata_adr;
+	int		status;
+	char		basepath[ACPI_PATHNAME_MAX];
+	int		basepath_len;
+};
+
+static acpi_status get_devices(acpi_handle handle,
+				u32 level, void *context, void **return_value)
+{
+	acpi_status		status;
+	struct walk_info	*winfo = context;
+	struct acpi_buffer	namebuf = {ACPI_ALLOCATE_BUFFER, NULL};
+	char			*pathname;
+	struct acpi_buffer	buffer;
+	struct acpi_device_info	*dinfo;
+
+	status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &namebuf);
+	if (status)
+		goto ret;
+	pathname = namebuf.pointer;
+
+	buffer.length = ACPI_ALLOCATE_BUFFER;
+	buffer.pointer = NULL;
+	status = acpi_get_object_info(handle, &buffer);
+	if (ACPI_FAILURE(status))
+		goto out2;
+
+	dinfo = buffer.pointer;
+
+	/* find full device path name for pcidevfn */
+	if (dinfo && (dinfo->valid & ACPI_VALID_ADR) &&
+	    dinfo->address == winfo->pcidevfn) {
+		if (ata_msg_probe(winfo->ataport))
+			ata_dev_printk(winfo->atadev, KERN_DEBUG,
+				":%s: matches pcidevfn (0x%llx)\n",
+				pathname, winfo->pcidevfn);
+		strlcpy(winfo->basepath, pathname,
+			sizeof(winfo->basepath));
+		winfo->basepath_len = strlen(pathname);
+		goto out;
+	}
+
+	/* if basepath is not yet known, ignore this object */
+	if (!winfo->basepath_len)
+		goto out;
+
+	/* if this object is in scope of basepath, maybe use it */
+	if (strncmp(pathname, winfo->basepath,
+	    winfo->basepath_len) == 0) {
+		if (!(dinfo->valid & ACPI_VALID_ADR))
+			goto out;
+		if (ata_msg_probe(winfo->ataport))
+			ata_dev_printk(winfo->atadev, KERN_DEBUG,
+				"GOT ONE: (%s) root_port = 0x%llx,"
+				" port_num = 0x%llx\n", pathname,
+				SATA_ROOT_PORT(dinfo->address),
+				SATA_PORT_NUMBER(dinfo->address));
+		/* heuristics: */
+		if (SATA_PORT_NUMBER(dinfo->address) != NO_PORT_MULT)
+			if (ata_msg_probe(winfo->ataport))
+				ata_dev_printk(winfo->atadev,
+					KERN_DEBUG, "warning: don't"
+					" know how to handle SATA port"
+					" multiplier\n");
+		if (SATA_ROOT_PORT(dinfo->address) ==
+			winfo->ataport->port_no &&
+		    SATA_PORT_NUMBER(dinfo->address) == NO_PORT_MULT) {
+			if (ata_msg_probe(winfo->ataport))
+				ata_dev_printk(winfo->atadev,
+					KERN_DEBUG,
+					"THIS ^^^^^ is the requested"
+					" SATA drive (handle = 0x%p)\n",
+					handle);
+			winfo->sata_adr = dinfo->address;
+			winfo->obj_handle = handle;
+		}
+	}
+out:
+	kfree(dinfo);
+out2:
+	kfree(pathname);
+
+ret:
+	return status;
+}
+
+/* Get the SATA drive _ADR object. */
+static int get_sata_adr(struct device *dev, acpi_handle handle,
+			acpi_integer pcidevfn, unsigned int drive,
+			struct ata_port *ap,
+			struct ata_device *atadev, u32 *dev_adr)
+{
+	acpi_status	status;
+	struct walk_info *winfo;
+	int		err = -ENOMEM;
+
+	winfo = kzalloc(sizeof(struct walk_info), GFP_KERNEL);
+	if (!winfo)
+		goto out;
+
+	winfo->dev = dev;
+	winfo->atadev = atadev;
+	winfo->ataport = ap;
+	if (acpi_bus_get_device(handle, &winfo->adev) < 0)
+		if (ata_msg_probe(ap))
+			ata_dev_printk(winfo->atadev, KERN_DEBUG,
+				"acpi_bus_get_device failed\n");
+	winfo->handle = handle;
+	winfo->pcidevfn = pcidevfn;
+	winfo->drivenum = drive;
+
+	status = acpi_get_devices(NULL, get_devices, winfo, NULL);
+	if (ACPI_FAILURE(status)) {
+		if (ata_msg_probe(ap))
+			ata_dev_printk(winfo->atadev, KERN_DEBUG,
+				"%s: acpi_get_devices failed\n",
+				__FUNCTION__);
+		err = -ENODEV;
+	} else {
+		*dev_adr = winfo->sata_adr;
+		atadev->obj_handle = winfo->obj_handle;
+		err = 0;
+	}
+	kfree(winfo);
+out:
+	return err;
+}
+
+/**
+ * do_drive_get_GTF - get the drive bootup default taskfile settings
+ * @ap: the ata_port for the drive
+ * @ix: target ata_device (drive) index
+ * @gtf_length: number of bytes of _GTF data returned at @gtf_address
+ * @gtf_address: 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.
+ *
+ * The returned @gtf_length and @gtf_address are only valid if the
+ * function return value is 0.
+ */
+static int do_drive_get_GTF(struct ata_port *ap, int ix,
+			unsigned int *gtf_length, unsigned long *gtf_address,
+			unsigned long *obj_loc)
+{
+	acpi_status			status;
+	acpi_handle			dev_handle = NULL;
+	acpi_handle			chan_handle, drive_handle;
+	acpi_integer			pcidevfn = 0;
+	u32				dev_adr;
+	struct acpi_buffer		output;
+	union acpi_object 		*out_obj;
+	struct device			*dev = ap->host->dev;
+	struct ata_device		*atadev = &ap->device[ix];
+	int				err = -ENODEV;
+
+	*gtf_length = 0;
+	*gtf_address = 0UL;
+	*obj_loc = 0UL;
+
+	if (noacpi)
+		return 0;
+
+	if (ata_msg_probe(ap))
+		ata_dev_printk(atadev, KERN_DEBUG,
+			"%s: ENTER: ap->id: %d, port#: %d\n",
+			__FUNCTION__, ap->id, ap->port_no);
+
+	if (!ata_dev_enabled(atadev) || (ap->flags & ATA_FLAG_DISABLED)) {
+		if (ata_msg_probe(ap))
+			ata_dev_printk(atadev, KERN_DEBUG, "%s: ERR: "
+				"ata_dev_present: %d, PORT_DISABLED: %lu\n",
+				__FUNCTION__, ata_dev_enabled(atadev),
+				ap->flags & ATA_FLAG_DISABLED);
+		goto out;
+	}
+
+	/* Don't continue if device has no _ADR method.
+	 * _GTF is intended for known motherboard devices. */
+	if (!(ap->cbl == ATA_CBL_SATA)) {
+		err = pata_get_dev_handle(dev, &dev_handle, &pcidevfn);
+		if (err < 0) {
+			if (ata_msg_probe(ap))
+				ata_dev_printk(atadev, KERN_DEBUG,
+					"%s: pata_get_dev_handle failed (%d)\n",
+					__FUNCTION__, err);
+			goto out;
+		}
+	} else {
+		err = sata_get_dev_handle(dev, &dev_handle, &pcidevfn);
+		if (err < 0) {
+			if (ata_msg_probe(ap))
+				ata_dev_printk(atadev, KERN_DEBUG,
+					"%s: sata_get_dev_handle failed (%d\n",
+					__FUNCTION__, err);
+			goto out;
+		}
+	}
+
+	/* Get this drive's _ADR info. if not already known. */
+	if (!atadev->obj_handle) {
+		if (!(ap->cbl == ATA_CBL_SATA)) {
+			/* get child objects of dev_handle == channel objects,
+	 		 * + _their_ children == drive objects */
+			/* channel is ap->port_no */
+			chan_handle = acpi_get_child(dev_handle,
+						ap->port_no);
+			if (ata_msg_probe(ap))
+				ata_dev_printk(atadev, KERN_DEBUG,
+					"%s: chan adr=%d: chan_handle=0x%p\n",
+					__FUNCTION__, ap->port_no,
+					chan_handle);
+			if (!chan_handle) {
+				err = -ENODEV;
+				goto out;
+			}
+			/* TBD: could also check ACPI object VALID bits */
+			drive_handle = acpi_get_child(chan_handle, ix);
+			if (!drive_handle) {
+				err = -ENODEV;
+				goto out;
+			}
+			dev_adr = ix;
+			atadev->obj_handle = drive_handle;
+		} else {	/* for SATA mode */
+			dev_adr = SATA_ADR_RSVD;
+			err = get_sata_adr(dev, dev_handle, pcidevfn, 0,
+					ap, atadev, &dev_adr);
+		}
+		if (err < 0 || dev_adr == SATA_ADR_RSVD ||
+		    !atadev->obj_handle) {
+			if (ata_msg_probe(ap))
+				ata_dev_printk(atadev, KERN_DEBUG,
+					"%s: get_sata/pata_adr failed: "
+					"err=%d, dev_adr=%u, obj_handle=0x%p\n",
+					__FUNCTION__, err, dev_adr,
+					atadev->obj_handle);
+			goto out;
+		}
+	}
+
+	/* Setting up output buffer */
+	output.length = ACPI_ALLOCATE_BUFFER;
+	output.pointer = NULL;	/* ACPI-CA sets this; save/free it later */
+
+	/* _GTF has no input parameters */
+	err = -EIO;
+	status = acpi_evaluate_object(atadev->obj_handle, "_GTF",
+					NULL, &output);
+	if (ACPI_FAILURE(status)) {
+		if (ata_msg_probe(ap))
+			ata_dev_printk(atadev, KERN_DEBUG,
+				"%s: Run _GTF error: status = 0x%x\n",
+				__FUNCTION__, status);
+		goto out;
+	}
+
+	if (!output.length || !output.pointer) {
+		if (ata_msg_probe(ap))
+			ata_dev_printk(atadev, KERN_DEBUG, "%s: Run _GTF: "
+				"length or ptr is NULL (0x%llx, 0x%p)\n",
+				__FUNCTION__,
+				(unsigned long long)output.length,
+				output.pointer);
+		kfree(output.pointer);
+		goto out;
+	}
+
+	out_obj = output.pointer;
+	if (out_obj->type != ACPI_TYPE_BUFFER) {
+		kfree(output.pointer);
+		if (ata_msg_probe(ap))
+			ata_dev_printk(atadev, KERN_DEBUG, "%s: Run _GTF: "
+				"error: expected object type of "
+				" ACPI_TYPE_BUFFER, got 0x%x\n",
+				__FUNCTION__, out_obj->type);
+		err = -ENOENT;
+		goto out;
+	}
+
+	if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
+	    out_obj->buffer.length % REGS_PER_GTF) {
+		if (ata_msg_drv(ap))
+			ata_dev_printk(atadev, KERN_ERR,
+				"%s: unexpected GTF length (%d) or addr (0x%p)\n",
+				__FUNCTION__, out_obj->buffer.length,
+				out_obj->buffer.pointer);
+		err = -ENOENT;
+		goto out;
+	}
+
+	*gtf_length = out_obj->buffer.length;
+	*gtf_address = (unsigned long)out_obj->buffer.pointer;
+	*obj_loc = (unsigned long)out_obj;
+	if (ata_msg_probe(ap))
+		ata_dev_printk(atadev, KERN_DEBUG, "%s: returning "
+			"gtf_length=%d, gtf_address=0x%lx, obj_loc=0x%lx\n",
+			__FUNCTION__, *gtf_length, *gtf_address, *obj_loc);
+	err = 0;
+out:
+	return err;
+}
+
+/**
+ * taskfile_load_raw - send taskfile registers to host controller
+ * @ap: Port to which output is sent
+ * @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: TBD:
+ * Inherited from caller.
+ */
+static void taskfile_load_raw(struct ata_port *ap,
+				struct ata_device *atadev,
+				const struct taskfile_array *gtf)
+{
+	if (ata_msg_probe(ap))
+		ata_dev_printk(atadev, KERN_DEBUG, "%s: (0x1f1-1f7): hex: "
+			"%02x %02x %02x %02x %02x %02x %02x\n",
+			__FUNCTION__,
+			gtf->tfa[0], gtf->tfa[1], gtf->tfa[2],
+			gtf->tfa[3], gtf->tfa[4], gtf->tfa[5], gtf->tfa[6]);
+
+	if ((gtf->tfa[0] == 0) && (gtf->tfa[1] == 0) && (gtf->tfa[2] == 0)
+	    && (gtf->tfa[3] == 0) && (gtf->tfa[4] == 0) && (gtf->tfa[5] == 0)
+	    && (gtf->tfa[6] == 0))
+		return;
+
+	if (ap->ops->qc_issue) {
+		struct ata_taskfile tf;
+		unsigned int err;
+
+		ata_tf_init(atadev, &tf);
+
+		/* convert gtf to tf */
+		tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; /* TBD */
+		tf.protocol = atadev->class == ATA_DEV_ATAPI ?
+			ATA_PROT_ATAPI_NODATA : ATA_PROT_NODATA;
+		tf.feature = gtf->tfa[0];	/* 0x1f1 */
+		tf.nsect   = gtf->tfa[1];	/* 0x1f2 */
+		tf.lbal    = gtf->tfa[2];	/* 0x1f3 */
+		tf.lbam    = gtf->tfa[3];	/* 0x1f4 */
+		tf.lbah    = gtf->tfa[4];	/* 0x1f5 */
+		tf.device  = gtf->tfa[5];	/* 0x1f6 */
+		tf.command = gtf->tfa[6];	/* 0x1f7 */
+
+		err = ata_exec_internal(atadev, &tf, NULL, DMA_NONE, NULL, 0);
+		if (err && ata_msg_probe(ap))
+			ata_dev_printk(atadev, KERN_ERR,
+				"%s: ata_exec_internal failed: %u\n",
+				__FUNCTION__, err);
+	} else
+		if (ata_msg_warn(ap))
+			ata_dev_printk(atadev, KERN_WARNING,
+				"%s: SATA driver is missing qc_issue function"
+				" entry points\n",
+				__FUNCTION__);
+}
+
+/**
+ * do_drive_set_taskfiles - write the drive taskfile settings from _GTF
+ * @ap: the ata_port for the drive
+ * @atadev: target ata_device
+ * @gtf_length: total number of bytes of _GTF taskfiles
+ * @gtf_address: location of _GTF taskfile arrays
+ *
+ * This applies to both PATA and SATA drives.
+ *
+ * Write {gtf_address, length gtf_length} in groups of
+ * REGS_PER_GTF bytes.
+ */
+static int do_drive_set_taskfiles(struct ata_port *ap,
+		struct ata_device *atadev, unsigned int gtf_length,
+		unsigned long gtf_address)
+{
+	int			err = -ENODEV;
+	int			gtf_count = gtf_length / REGS_PER_GTF;
+	int			ix;
+	struct taskfile_array	*gtf;
+
+	if (ata_msg_probe(ap))
+		ata_dev_printk(atadev, KERN_DEBUG,
+			"%s: ENTER: ap->id: %d, port#: %d\n",
+			__FUNCTION__, ap->id, ap->port_no);
+
+	if (noacpi || !(ap->cbl == ATA_CBL_SATA))
+		return 0;
+
+	if (!ata_dev_enabled(atadev) || (ap->flags & ATA_FLAG_DISABLED))
+		goto out;
+	if (!gtf_count)		/* shouldn't be here */
+		goto out;
+
+	if (gtf_length % REGS_PER_GTF) {
+		if (ata_msg_drv(ap))
+			ata_dev_printk(atadev, KERN_ERR,
+				"%s: unexpected GTF length (%d)\n",
+				__FUNCTION__, gtf_length);
+		goto out;
+	}
+
+	for (ix = 0; ix < gtf_count; ix++) {
+		gtf = (struct taskfile_array *)
+			(gtf_address + ix * REGS_PER_GTF);
+
+		/* send all TaskFile registers (0x1f1-0x1f7) *in*that*order* */
+		taskfile_load_raw(ap, atadev, gtf);
+	}
+
+	err = 0;
+out:
+	return err;
+}
+
+/**
+ * ata_acpi_exec_tfs - get then write drive taskfile settings
+ * @ap: the ata_port for the drive
+ *
+ * This applies to both PATA and SATA drives.
+ */
+int ata_acpi_exec_tfs(struct ata_port *ap)
+{
+	int		ix;
+	int		ret =0;
+	unsigned int	gtf_length;
+	unsigned long	gtf_address;
+	unsigned long	obj_loc;
+
+	if (noacpi)
+		return 0;
+
+	for (ix = 0; ix < ATA_MAX_DEVICES; ix++) {
+		if (!ata_dev_enabled(&ap->device[ix]))
+			continue;
+
+		ret = do_drive_get_GTF(ap, ix,
+				&gtf_length, &gtf_address, &obj_loc);
+		if (ret < 0) {
+			if (ata_msg_probe(ap))
+				ata_port_printk(ap, KERN_DEBUG,
+					"%s: get_GTF error (%d)\n",
+					__FUNCTION__, ret);
+			break;
+		}
+
+		ret = do_drive_set_taskfiles(ap, &ap->device[ix],
+				gtf_length, gtf_address);
+		kfree((void *)obj_loc);
+		if (ret < 0) {
+			if (ata_msg_probe(ap))
+				ata_port_printk(ap, KERN_DEBUG,
+					"%s: set_taskfiles error (%d)\n",
+					__FUNCTION__, ret);
+			break;
+		}
+	}
+
+	return ret;
+}
@@ -93,6 +93,10 @@
 module_param(ata_probe_timeout, int, 0444);
 MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");
  
+int noacpi;
+module_param(noacpi, int, 0444);
+MODULE_PARM_DESC(noacpi, "Disables the use of ACPI in suspend/resume when set");
+
 MODULE_AUTHOR("Jeff Garzik");
 MODULE_DESCRIPTION("Library module for ATA devices");
 MODULE_LICENSE("GPL");
@@ -1777,6 +1781,9 @@
  
 	/* reset and determine device classes */
 	ap->ops->phy_reset(ap);
+
+	/* retrieve and execute the ATA task file of _GTF */
+	ata_acpi_exec_tfs(ap);
  
 	for (i = 0; i < ATA_MAX_DEVICES; i++) {
 		dev = &ap->device[i];
@@ -47,6 +47,7 @@
 extern int atapi_enabled;
 extern int atapi_dmadir;
 extern int libata_fua;
+extern int noacpi;
 extern struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev);
 extern int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
 			   u64 block, u32 n_block, unsigned int tf_flags,
@@ -87,6 +88,15 @@
 extern struct ata_probe_ent *ata_probe_ent_alloc(struct device *dev,
 						 const struct ata_port_info *port);
  
+/* libata-acpi.c */
+#ifdef CONFIG_SATA_ACPI
+extern int ata_acpi_exec_tfs(struct ata_port *ap);
+#else
+static inline int ata_acpi_exec_tfs(struct ata_port *ap)
+{
+	return 0;
+}
+#endif
  
 /* libata-scsi.c */
 extern struct scsi_transport_template ata_scsi_transport_template;
@@ -35,6 +35,7 @@
 #include <linux/ata.h>
 #include <linux/workqueue.h>
 #include <scsi/scsi_host.h>
+#include <linux/acpi.h>
  
 /*
  * Define if arch has non-standard setup.  This is a _PCI_ standard
@@ -495,6 +496,10 @@
 	/* error history */
 	struct ata_ering	ering;
 	unsigned int		horkage;	/* List of broken features */
+#ifdef CONFIG_SATA_ACPI
+	/* ACPI objects info */
+	acpi_handle obj_handle;
+#endif
 };
  
 /* Offset into struct ata_device.  Fields above it are maintained
...	...	@@ -48,6 +48,7 @@
48	48	ISAPNP ISA PnP code is enabled.
49	49	ISDN Appropriate ISDN support is enabled.
50	50	JOY Appropriate joystick support is enabled.
	51	+ LIBATA Libata driver is enabled
51	52	LP Printer support is enabled.
52	53	LOOP Loopback device support is enabled.
53	54	M68k M68k architecture is enabled.
...	...	@@ -1037,6 +1038,10 @@
1037	1038	no387 [BUGS=IA-32] Tells the kernel to use the 387 maths
1038	1039	emulation library even if a 387 maths coprocessor
1039	1040	is present.
	1041	+
	1042	+ noacpi [LIBATA] Disables use of ACPI in libata suspend/resume
	1043	+ when set.
	1044	+ Format: <int>
1040	1045
1041	1046	noaliencache [MM, NUMA] Disables the allcoation of alien caches in
1042	1047	the slab allocator. Saves per-node memory, but will
...	...	@@ -161,6 +161,19 @@
161	161	depends on IDE=y && !BLK_DEV_IDE_SATA && (SATA_AHCI \|\| ATA_PIIX)
162	162	default y
163	163
	164	+config SATA_ACPI
	165	+ bool
	166	+ depends on ACPI && PCI
	167	+ default y
	168	+ help
	169	+ This option adds support for SATA-related ACPI objects.
	170	+ These ACPI objects add the ability to retrieve taskfiles
	171	+ from the ACPI BIOS and write them to the disk controller.
	172	+ These objects may be related to performance, security,
	173	+ power management, or other areas.
	174	+ You can disable this at kernel boot time by using the
	175	+ option libata.noacpi=1
	176	+
164	177	config PATA_ALI
165	178	tristate "ALi PATA support (Experimental)"
166	179	depends on PCI && EXPERIMENTAL
...	...	@@ -66,4 +66,5 @@
66	66	obj-$(CONFIG_PATA_LEGACY) += pata_legacy.o
67	67
68	68	libata-objs := libata-core.o libata-scsi.o libata-sff.o libata-eh.o
	69	+libata-$(CONFIG_SATA_ACPI) += libata-acpi.o
	1	+/*
	2	+ * libata-acpi.c
	3	+ * Provides ACPI support for PATA/SATA.
	4	+ *
	5	+ * Copyright (C) 2006 Intel Corp.
	6	+ * Copyright (C) 2006 Randy Dunlap
	7	+ */
	8	+
	9	+#include <linux/ata.h>
	10	+#include <linux/delay.h>
	11	+#include <linux/device.h>
	12	+#include <linux/errno.h>
	13	+#include <linux/kernel.h>
	14	+#include <linux/acpi.h>
	15	+#include <linux/libata.h>
	16	+#include <linux/pci.h>
	17	+#include "libata.h"
	18	+
	19	+#include <acpi/acpi_bus.h>
	20	+#include <acpi/acnames.h>
	21	+#include <acpi/acnamesp.h>
	22	+#include <acpi/acparser.h>
	23	+#include <acpi/acexcep.h>
	24	+#include <acpi/acmacros.h>
	25	+#include <acpi/actypes.h>
	26	+
	27	+#define SATA_ROOT_PORT(x) (((x) >> 16) & 0xffff)
	28	+#define SATA_PORT_NUMBER(x) ((x) & 0xffff) /* or NO_PORT_MULT */
	29	+#define NO_PORT_MULT 0xffff
	30	+#define SATA_ADR_RSVD 0xffffffff
	31	+
	32	+#define REGS_PER_GTF 7
	33	+struct taskfile_array {
	34	+ u8 tfa[REGS_PER_GTF]; /* regs. 0x1f1 - 0x1f7 */
	35	+};
	36	+
	37	+
	38	+/**
	39	+ * sata_get_dev_handle - finds acpi_handle and PCI device.function
	40	+ * @dev: device to locate
	41	+ * @handle: returned acpi_handle for @dev
	42	+ * @pcidevfn: return PCI device.func for @dev
	43	+ *
	44	+ * This function is somewhat SATA-specific. Or at least the
	45	+ * PATA & SATA versions of this function are different,
	46	+ * so it's not entirely generic code.
	47	+ *
	48	+ * Returns 0 on success, <0 on error.
	49	+ */
	50	+static int sata_get_dev_handle(struct device dev, acpi_handle handle,
	51	+ acpi_integer *pcidevfn)
	52	+{
	53	+ struct pci_dev *pci_dev;
	54	+ acpi_integer addr;
	55	+
	56	+ pci_dev = to_pci_dev(dev); /* NOTE: PCI-specific */
	57	+ /* Please refer to the ACPI spec for the syntax of _ADR. */
	58	+ addr = (PCI_SLOT(pci_dev->devfn) << 16) \| PCI_FUNC(pci_dev->devfn);
	59	+ *pcidevfn = addr;
	60	+ *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
	61	+ if (!*handle)
	62	+ return -ENODEV;
	63	+ return 0;
	64	+}
	65	+
	66	+/**
	67	+ * pata_get_dev_handle - finds acpi_handle and PCI device.function
	68	+ * @dev: device to locate
	69	+ * @handle: returned acpi_handle for @dev
	70	+ * @pcidevfn: return PCI device.func for @dev
	71	+ *
	72	+ * The PATA and SATA versions of this function are different.
	73	+ *
	74	+ * Returns 0 on success, <0 on error.
	75	+ */
	76	+static int pata_get_dev_handle(struct device dev, acpi_handle handle,
	77	+ acpi_integer *pcidevfn)
	78	+{
	79	+ unsigned int bus, devnum, func;
	80	+ acpi_integer addr;
	81	+ acpi_handle dev_handle, parent_handle;
	82	+ struct acpi_buffer buffer = {.length = ACPI_ALLOCATE_BUFFER,
	83	+ .pointer = NULL};
	84	+ acpi_status status;
	85	+ struct acpi_device_info *dinfo = NULL;
	86	+ int ret = -ENODEV;
	87	+ struct pci_dev *pdev = to_pci_dev(dev);
	88	+
	89	+ bus = pdev->bus->number;
	90	+ devnum = PCI_SLOT(pdev->devfn);
	91	+ func = PCI_FUNC(pdev->devfn);
	92	+
	93	+ dev_handle = DEVICE_ACPI_HANDLE(dev);
	94	+ parent_handle = DEVICE_ACPI_HANDLE(dev->parent);
	95	+
	96	+ status = acpi_get_object_info(parent_handle, &buffer);
	97	+ if (ACPI_FAILURE(status))
	98	+ goto err;
	99	+
	100	+ dinfo = buffer.pointer;
	101	+ if (dinfo && (dinfo->valid & ACPI_VALID_ADR) &&
	102	+ dinfo->address == bus) {
	103	+ /* ACPI spec for _ADR for PCI bus: */
	104	+ addr = (acpi_integer)(devnum << 16 \| func);
	105	+ *pcidevfn = addr;
	106	+ *handle = dev_handle;
	107	+ } else {
	108	+ goto err;
	109	+ }
	110	+
	111	+ if (!*handle)
	112	+ goto err;
	113	+ ret = 0;
	114	+err:
	115	+ kfree(dinfo);
	116	+ return ret;
	117	+}
	118	+
	119	+struct walk_info { /* can be trimmed some */
	120	+ struct device *dev;
	121	+ struct acpi_device *adev;
	122	+ acpi_handle handle;
	123	+ acpi_integer pcidevfn;
	124	+ unsigned int drivenum;
	125	+ acpi_handle obj_handle;
	126	+ struct ata_port *ataport;
	127	+ struct ata_device *atadev;
	128	+ u32 sata_adr;
	129	+ int status;
	130	+ char basepath[ACPI_PATHNAME_MAX];
	131	+ int basepath_len;
	132	+};
	133	+
	134	+static acpi_status get_devices(acpi_handle handle,
	135	+ u32 level, void context, void *return_value)
	136	+{
	137	+ acpi_status status;
	138	+ struct walk_info *winfo = context;
	139	+ struct acpi_buffer namebuf = {ACPI_ALLOCATE_BUFFER, NULL};
	140	+ char *pathname;
	141	+ struct acpi_buffer buffer;
	142	+ struct acpi_device_info *dinfo;
	143	+
	144	+ status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &namebuf);
	145	+ if (status)
	146	+ goto ret;
	147	+ pathname = namebuf.pointer;
	148	+
	149	+ buffer.length = ACPI_ALLOCATE_BUFFER;
	150	+ buffer.pointer = NULL;
	151	+ status = acpi_get_object_info(handle, &buffer);
	152	+ if (ACPI_FAILURE(status))
	153	+ goto out2;
	154	+
	155	+ dinfo = buffer.pointer;
	156	+
	157	+ /* find full device path name for pcidevfn */
	158	+ if (dinfo && (dinfo->valid & ACPI_VALID_ADR) &&
	159	+ dinfo->address == winfo->pcidevfn) {
	160	+ if (ata_msg_probe(winfo->ataport))
	161	+ ata_dev_printk(winfo->atadev, KERN_DEBUG,
	162	+ ":%s: matches pcidevfn (0x%llx)\n",
	163	+ pathname, winfo->pcidevfn);
	164	+ strlcpy(winfo->basepath, pathname,
	165	+ sizeof(winfo->basepath));
	166	+ winfo->basepath_len = strlen(pathname);
	167	+ goto out;
	168	+ }
	169	+
	170	+ /* if basepath is not yet known, ignore this object */
	171	+ if (!winfo->basepath_len)
	172	+ goto out;
	173	+
	174	+ /* if this object is in scope of basepath, maybe use it */
	175	+ if (strncmp(pathname, winfo->basepath,
	176	+ winfo->basepath_len) == 0) {
	177	+ if (!(dinfo->valid & ACPI_VALID_ADR))
	178	+ goto out;
	179	+ if (ata_msg_probe(winfo->ataport))
	180	+ ata_dev_printk(winfo->atadev, KERN_DEBUG,
	181	+ "GOT ONE: (%s) root_port = 0x%llx,"
	182	+ " port_num = 0x%llx\n", pathname,
	183	+ SATA_ROOT_PORT(dinfo->address),
	184	+ SATA_PORT_NUMBER(dinfo->address));
	185	+ /* heuristics: */
	186	+ if (SATA_PORT_NUMBER(dinfo->address) != NO_PORT_MULT)
	187	+ if (ata_msg_probe(winfo->ataport))
	188	+ ata_dev_printk(winfo->atadev,
	189	+ KERN_DEBUG, "warning: don't"
	190	+ " know how to handle SATA port"
	191	+ " multiplier\n");
	192	+ if (SATA_ROOT_PORT(dinfo->address) ==
	193	+ winfo->ataport->port_no &&
	194	+ SATA_PORT_NUMBER(dinfo->address) == NO_PORT_MULT) {
	195	+ if (ata_msg_probe(winfo->ataport))
	196	+ ata_dev_printk(winfo->atadev,
	197	+ KERN_DEBUG,
	198	+ "THIS ^^^^^ is the requested"
	199	+ " SATA drive (handle = 0x%p)\n",
	200	+ handle);
	201	+ winfo->sata_adr = dinfo->address;
	202	+ winfo->obj_handle = handle;
	203	+ }
	204	+ }
	205	+out:
	206	+ kfree(dinfo);
	207	+out2:
	208	+ kfree(pathname);
	209	+
	210	+ret:
	211	+ return status;
	212	+}
	213	+
	214	+/* Get the SATA drive _ADR object. */
	215	+static int get_sata_adr(struct device *dev, acpi_handle handle,
	216	+ acpi_integer pcidevfn, unsigned int drive,
	217	+ struct ata_port *ap,
	218	+ struct ata_device atadev, u32 dev_adr)
	219	+{
	220	+ acpi_status status;
	221	+ struct walk_info *winfo;
	222	+ int err = -ENOMEM;
	223	+
	224	+ winfo = kzalloc(sizeof(struct walk_info), GFP_KERNEL);
	225	+ if (!winfo)
	226	+ goto out;
	227	+
	228	+ winfo->dev = dev;
	229	+ winfo->atadev = atadev;
	230	+ winfo->ataport = ap;
	231	+ if (acpi_bus_get_device(handle, &winfo->adev) < 0)
	232	+ if (ata_msg_probe(ap))
	233	+ ata_dev_printk(winfo->atadev, KERN_DEBUG,
	234	+ "acpi_bus_get_device failed\n");
	235	+ winfo->handle = handle;
	236	+ winfo->pcidevfn = pcidevfn;
	237	+ winfo->drivenum = drive;
	238	+
	239	+ status = acpi_get_devices(NULL, get_devices, winfo, NULL);
	240	+ if (ACPI_FAILURE(status)) {
	241	+ if (ata_msg_probe(ap))
	242	+ ata_dev_printk(winfo->atadev, KERN_DEBUG,
	243	+ "%s: acpi_get_devices failed\n",
	244	+ __FUNCTION__);
	245	+ err = -ENODEV;
	246	+ } else {
	247	+ *dev_adr = winfo->sata_adr;
	248	+ atadev->obj_handle = winfo->obj_handle;
	249	+ err = 0;
	250	+ }
	251	+ kfree(winfo);
	252	+out:
	253	+ return err;
	254	+}
	255	+
	256	+/**
	257	+ * do_drive_get_GTF - get the drive bootup default taskfile settings
	258	+ * @ap: the ata_port for the drive
	259	+ * @ix: target ata_device (drive) index
	260	+ * @gtf_length: number of bytes of _GTF data returned at @gtf_address
	261	+ * @gtf_address: buffer containing _GTF taskfile arrays
	262	+ *
	263	+ * This applies to both PATA and SATA drives.
	264	+ *
	265	+ * The _GTF method has no input parameters.
	266	+ * It returns a variable number of register set values (registers
	267	+ * hex 1F1..1F7, taskfiles).
	268	+ * The <variable number> is not known in advance, so have ACPI-CA
	269	+ * allocate the buffer as needed and return it, then free it later.
	270	+ *
	271	+ * The returned @gtf_length and @gtf_address are only valid if the
	272	+ * function return value is 0.
	273	+ */
	274	+static int do_drive_get_GTF(struct ata_port *ap, int ix,
	275	+ unsigned int gtf_length, unsigned long gtf_address,
	276	+ unsigned long *obj_loc)
	277	+{
	278	+ acpi_status status;
	279	+ acpi_handle dev_handle = NULL;
	280	+ acpi_handle chan_handle, drive_handle;
	281	+ acpi_integer pcidevfn = 0;
	282	+ u32 dev_adr;
	283	+ struct acpi_buffer output;
	284	+ union acpi_object *out_obj;
	285	+ struct device *dev = ap->host->dev;
	286	+ struct ata_device *atadev = &ap->device[ix];
	287	+ int err = -ENODEV;
	288	+
	289	+ *gtf_length = 0;
	290	+ *gtf_address = 0UL;
	291	+ *obj_loc = 0UL;
	292	+
	293	+ if (noacpi)
	294	+ return 0;
	295	+
	296	+ if (ata_msg_probe(ap))
	297	+ ata_dev_printk(atadev, KERN_DEBUG,
	298	+ "%s: ENTER: ap->id: %d, port#: %d\n",
	299	+ __FUNCTION__, ap->id, ap->port_no);
	300	+
	301	+ if (!ata_dev_enabled(atadev) \|\| (ap->flags & ATA_FLAG_DISABLED)) {
	302	+ if (ata_msg_probe(ap))
	303	+ ata_dev_printk(atadev, KERN_DEBUG, "%s: ERR: "
	304	+ "ata_dev_present: %d, PORT_DISABLED: %lu\n",
	305	+ __FUNCTION__, ata_dev_enabled(atadev),
	306	+ ap->flags & ATA_FLAG_DISABLED);
	307	+ goto out;
	308	+ }
	309	+
	310	+ /* Don't continue if device has no _ADR method.
	311	+ * _GTF is intended for known motherboard devices. */
	312	+ if (!(ap->cbl == ATA_CBL_SATA)) {
	313	+ err = pata_get_dev_handle(dev, &dev_handle, &pcidevfn);
	314	+ if (err < 0) {
	315	+ if (ata_msg_probe(ap))
	316	+ ata_dev_printk(atadev, KERN_DEBUG,
	317	+ "%s: pata_get_dev_handle failed (%d)\n",
	318	+ __FUNCTION__, err);
	319	+ goto out;
	320	+ }
	321	+ } else {
	322	+ err = sata_get_dev_handle(dev, &dev_handle, &pcidevfn);
	323	+ if (err < 0) {
	324	+ if (ata_msg_probe(ap))
	325	+ ata_dev_printk(atadev, KERN_DEBUG,
	326	+ "%s: sata_get_dev_handle failed (%d\n",
	327	+ __FUNCTION__, err);
	328	+ goto out;
	329	+ }
	330	+ }
	331	+
	332	+ /* Get this drive's _ADR info. if not already known. */
	333	+ if (!atadev->obj_handle) {
	334	+ if (!(ap->cbl == ATA_CBL_SATA)) {
	335	+ /* get child objects of dev_handle == channel objects,
	336	+ * + _their_ children == drive objects */
	337	+ /* channel is ap->port_no */
	338	+ chan_handle = acpi_get_child(dev_handle,
	339	+ ap->port_no);
	340	+ if (ata_msg_probe(ap))
	341	+ ata_dev_printk(atadev, KERN_DEBUG,
	342	+ "%s: chan adr=%d: chan_handle=0x%p\n",
	343	+ __FUNCTION__, ap->port_no,
	344	+ chan_handle);
	345	+ if (!chan_handle) {
	346	+ err = -ENODEV;
	347	+ goto out;
	348	+ }
	349	+ /* TBD: could also check ACPI object VALID bits */
	350	+ drive_handle = acpi_get_child(chan_handle, ix);
	351	+ if (!drive_handle) {
	352	+ err = -ENODEV;
	353	+ goto out;
	354	+ }
	355	+ dev_adr = ix;
	356	+ atadev->obj_handle = drive_handle;
	357	+ } else { /* for SATA mode */
	358	+ dev_adr = SATA_ADR_RSVD;
	359	+ err = get_sata_adr(dev, dev_handle, pcidevfn, 0,
	360	+ ap, atadev, &dev_adr);
	361	+ }
	362	+ if (err < 0 \|\| dev_adr == SATA_ADR_RSVD \|\|
	363	+ !atadev->obj_handle) {
	364	+ if (ata_msg_probe(ap))
	365	+ ata_dev_printk(atadev, KERN_DEBUG,
	366	+ "%s: get_sata/pata_adr failed: "
	367	+ "err=%d, dev_adr=%u, obj_handle=0x%p\n",
	368	+ __FUNCTION__, err, dev_adr,
	369	+ atadev->obj_handle);
	370	+ goto out;
	371	+ }
	372	+ }
	373	+
	374	+ /* Setting up output buffer */
	375	+ output.length = ACPI_ALLOCATE_BUFFER;
	376	+ output.pointer = NULL; /* ACPI-CA sets this; save/free it later */
	377	+
	378	+ /* _GTF has no input parameters */
	379	+ err = -EIO;
	380	+ status = acpi_evaluate_object(atadev->obj_handle, "_GTF",
	381	+ NULL, &output);
	382	+ if (ACPI_FAILURE(status)) {
	383	+ if (ata_msg_probe(ap))
	384	+ ata_dev_printk(atadev, KERN_DEBUG,
	385	+ "%s: Run _GTF error: status = 0x%x\n",
	386	+ __FUNCTION__, status);
	387	+ goto out;
	388	+ }
	389	+
	390	+ if (!output.length \|\| !output.pointer) {
	391	+ if (ata_msg_probe(ap))
	392	+ ata_dev_printk(atadev, KERN_DEBUG, "%s: Run _GTF: "
	393	+ "length or ptr is NULL (0x%llx, 0x%p)\n",
	394	+ __FUNCTION__,
	395	+ (unsigned long long)output.length,
	396	+ output.pointer);
	397	+ kfree(output.pointer);
	398	+ goto out;
	399	+ }
	400	+
	401	+ out_obj = output.pointer;
	402	+ if (out_obj->type != ACPI_TYPE_BUFFER) {
	403	+ kfree(output.pointer);
	404	+ if (ata_msg_probe(ap))
	405	+ ata_dev_printk(atadev, KERN_DEBUG, "%s: Run _GTF: "
	406	+ "error: expected object type of "
	407	+ " ACPI_TYPE_BUFFER, got 0x%x\n",
	408	+ __FUNCTION__, out_obj->type);
	409	+ err = -ENOENT;
	410	+ goto out;
	411	+ }
	412	+
	413	+ if (!out_obj->buffer.length \|\| !out_obj->buffer.pointer \|\|
	414	+ out_obj->buffer.length % REGS_PER_GTF) {
	415	+ if (ata_msg_drv(ap))
	416	+ ata_dev_printk(atadev, KERN_ERR,
	417	+ "%s: unexpected GTF length (%d) or addr (0x%p)\n",
	418	+ __FUNCTION__, out_obj->buffer.length,
	419	+ out_obj->buffer.pointer);
	420	+ err = -ENOENT;
	421	+ goto out;
	422	+ }
	423	+
	424	+ *gtf_length = out_obj->buffer.length;
	425	+ *gtf_address = (unsigned long)out_obj->buffer.pointer;
	426	+ *obj_loc = (unsigned long)out_obj;
	427	+ if (ata_msg_probe(ap))
	428	+ ata_dev_printk(atadev, KERN_DEBUG, "%s: returning "
	429	+ "gtf_length=%d, gtf_address=0x%lx, obj_loc=0x%lx\n",
	430	+ __FUNCTION__, gtf_length, gtf_address, *obj_loc);
	431	+ err = 0;
	432	+out:
	433	+ return err;
	434	+}
	435	+
	436	+/**
	437	+ * taskfile_load_raw - send taskfile registers to host controller
	438	+ * @ap: Port to which output is sent
	439	+ * @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7)
	440	+ *
	441	+ * Outputs ATA taskfile to standard ATA host controller using MMIO
	442	+ * or PIO as indicated by the ATA_FLAG_MMIO flag.
	443	+ * Writes the control, feature, nsect, lbal, lbam, and lbah registers.
	444	+ * Optionally (ATA_TFLAG_LBA48) writes hob_feature, hob_nsect,
	445	+ * hob_lbal, hob_lbam, and hob_lbah.
	446	+ *
	447	+ * This function waits for idle (!BUSY and !DRQ) after writing
	448	+ * registers. If the control register has a new value, this
	449	+ * function also waits for idle after writing control and before
	450	+ * writing the remaining registers.
	451	+ *
	452	+ * LOCKING: TBD:
	453	+ * Inherited from caller.
	454	+ */
	455	+static void taskfile_load_raw(struct ata_port *ap,
	456	+ struct ata_device *atadev,
	457	+ const struct taskfile_array *gtf)
	458	+{
	459	+ if (ata_msg_probe(ap))
	460	+ ata_dev_printk(atadev, KERN_DEBUG, "%s: (0x1f1-1f7): hex: "
	461	+ "%02x %02x %02x %02x %02x %02x %02x\n",
	462	+ __FUNCTION__,
	463	+ gtf->tfa[0], gtf->tfa[1], gtf->tfa[2],
	464	+ gtf->tfa[3], gtf->tfa[4], gtf->tfa[5], gtf->tfa[6]);
	465	+
	466	+ if ((gtf->tfa[0] == 0) && (gtf->tfa[1] == 0) && (gtf->tfa[2] == 0)
	467	+ && (gtf->tfa[3] == 0) && (gtf->tfa[4] == 0) && (gtf->tfa[5] == 0)
	468	+ && (gtf->tfa[6] == 0))
	469	+ return;
	470	+
	471	+ if (ap->ops->qc_issue) {
	472	+ struct ata_taskfile tf;
	473	+ unsigned int err;
	474	+
	475	+ ata_tf_init(atadev, &tf);
	476	+
	477	+ /* convert gtf to tf */
	478	+ tf.flags \|= ATA_TFLAG_ISADDR \| ATA_TFLAG_DEVICE; /* TBD */
	479	+ tf.protocol = atadev->class == ATA_DEV_ATAPI ?
	480	+ ATA_PROT_ATAPI_NODATA : ATA_PROT_NODATA;
	481	+ tf.feature = gtf->tfa[0]; /* 0x1f1 */
	482	+ tf.nsect = gtf->tfa[1]; /* 0x1f2 */
	483	+ tf.lbal = gtf->tfa[2]; /* 0x1f3 */
	484	+ tf.lbam = gtf->tfa[3]; /* 0x1f4 */
	485	+ tf.lbah = gtf->tfa[4]; /* 0x1f5 */
	486	+ tf.device = gtf->tfa[5]; /* 0x1f6 */
	487	+ tf.command = gtf->tfa[6]; /* 0x1f7 */
	488	+
	489	+ err = ata_exec_internal(atadev, &tf, NULL, DMA_NONE, NULL, 0);
	490	+ if (err && ata_msg_probe(ap))
	491	+ ata_dev_printk(atadev, KERN_ERR,
	492	+ "%s: ata_exec_internal failed: %u\n",
	493	+ __FUNCTION__, err);
	494	+ } else
	495	+ if (ata_msg_warn(ap))
	496	+ ata_dev_printk(atadev, KERN_WARNING,
	497	+ "%s: SATA driver is missing qc_issue function"
	498	+ " entry points\n",
	499	+ __FUNCTION__);
	500	+}
	501	+
	502	+/**
	503	+ * do_drive_set_taskfiles - write the drive taskfile settings from _GTF
	504	+ * @ap: the ata_port for the drive
	505	+ * @atadev: target ata_device
	506	+ * @gtf_length: total number of bytes of _GTF taskfiles
	507	+ * @gtf_address: location of _GTF taskfile arrays
	508	+ *
	509	+ * This applies to both PATA and SATA drives.
	510	+ *
	511	+ * Write {gtf_address, length gtf_length} in groups of
	512	+ * REGS_PER_GTF bytes.
	513	+ */
	514	+static int do_drive_set_taskfiles(struct ata_port *ap,
	515	+ struct ata_device *atadev, unsigned int gtf_length,
	516	+ unsigned long gtf_address)
	517	+{
	518	+ int err = -ENODEV;
	519	+ int gtf_count = gtf_length / REGS_PER_GTF;
	520	+ int ix;
	521	+ struct taskfile_array *gtf;
	522	+
	523	+ if (ata_msg_probe(ap))
	524	+ ata_dev_printk(atadev, KERN_DEBUG,
	525	+ "%s: ENTER: ap->id: %d, port#: %d\n",
	526	+ __FUNCTION__, ap->id, ap->port_no);
	527	+
	528	+ if (noacpi \|\| !(ap->cbl == ATA_CBL_SATA))
	529	+ return 0;
	530	+
	531	+ if (!ata_dev_enabled(atadev) \|\| (ap->flags & ATA_FLAG_DISABLED))
	532	+ goto out;
	533	+ if (!gtf_count) /* shouldn't be here */
	534	+ goto out;
	535	+
	536	+ if (gtf_length % REGS_PER_GTF) {
	537	+ if (ata_msg_drv(ap))
	538	+ ata_dev_printk(atadev, KERN_ERR,
	539	+ "%s: unexpected GTF length (%d)\n",
	540	+ __FUNCTION__, gtf_length);
	541	+ goto out;
	542	+ }
	543	+
	544	+ for (ix = 0; ix < gtf_count; ix++) {
	545	+ gtf = (struct taskfile_array *)
	546	+ (gtf_address + ix * REGS_PER_GTF);
	547	+
	548	+ /* send all TaskFile registers (0x1f1-0x1f7) inthatorder */
	549	+ taskfile_load_raw(ap, atadev, gtf);
	550	+ }
	551	+
	552	+ err = 0;
	553	+out:
	554	+ return err;
	555	+}
	556	+
	557	+/**
	558	+ * ata_acpi_exec_tfs - get then write drive taskfile settings
	559	+ * @ap: the ata_port for the drive
	560	+ *
	561	+ * This applies to both PATA and SATA drives.
	562	+ */
	563	+int ata_acpi_exec_tfs(struct ata_port *ap)
	564	+{
	565	+ int ix;
	566	+ int ret =0;
	567	+ unsigned int gtf_length;
	568	+ unsigned long gtf_address;
	569	+ unsigned long obj_loc;
	570	+
	571	+ if (noacpi)
	572	+ return 0;
	573	+
	574	+ for (ix = 0; ix < ATA_MAX_DEVICES; ix++) {
	575	+ if (!ata_dev_enabled(&ap->device[ix]))
	576	+ continue;
	577	+
	578	+ ret = do_drive_get_GTF(ap, ix,
	579	+ &gtf_length, &gtf_address, &obj_loc);
	580	+ if (ret < 0) {
	581	+ if (ata_msg_probe(ap))
	582	+ ata_port_printk(ap, KERN_DEBUG,
	583	+ "%s: get_GTF error (%d)\n",
	584	+ __FUNCTION__, ret);
	585	+ break;
	586	+ }
	587	+
	588	+ ret = do_drive_set_taskfiles(ap, &ap->device[ix],
	589	+ gtf_length, gtf_address);
	590	+ kfree((void *)obj_loc);
	591	+ if (ret < 0) {
	592	+ if (ata_msg_probe(ap))
	593	+ ata_port_printk(ap, KERN_DEBUG,
	594	+ "%s: set_taskfiles error (%d)\n",
	595	+ __FUNCTION__, ret);
	596	+ break;
	597	+ }
	598	+ }
	599	+
	600	+ return ret;
	601	+}
...	...	@@ -93,6 +93,10 @@
93	93	module_param(ata_probe_timeout, int, 0444);
94	94	MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");
95	95
	96	+int noacpi;
	97	+module_param(noacpi, int, 0444);
	98	+MODULE_PARM_DESC(noacpi, "Disables the use of ACPI in suspend/resume when set");
	99	+
96	100	MODULE_AUTHOR("Jeff Garzik");
97	101	MODULE_DESCRIPTION("Library module for ATA devices");
98	102	MODULE_LICENSE("GPL");
...	...	@@ -1777,6 +1781,9 @@
1777	1781
1778	1782	/* reset and determine device classes */
1779	1783	ap->ops->phy_reset(ap);
	1784	+
	1785	+ /* retrieve and execute the ATA task file of _GTF */
	1786	+ ata_acpi_exec_tfs(ap);
1780	1787
1781	1788	for (i = 0; i < ATA_MAX_DEVICES; i++) {
1782	1789	dev = &ap->device[i];
...	...	@@ -47,6 +47,7 @@
47	47	extern int atapi_enabled;
48	48	extern int atapi_dmadir;
49	49	extern int libata_fua;
	50	+extern int noacpi;
50	51	extern struct ata_queued_cmd ata_qc_new_init(struct ata_device dev);
51	52	extern int ata_build_rw_tf(struct ata_taskfile tf, struct ata_device dev,
52	53	u64 block, u32 n_block, unsigned int tf_flags,
...	...	@@ -87,6 +88,15 @@
87	88	extern struct ata_probe_ent ata_probe_ent_alloc(struct device dev,
88	89	const struct ata_port_info *port);
89	90
	91	+/* libata-acpi.c */
	92	+#ifdef CONFIG_SATA_ACPI
	93	+extern int ata_acpi_exec_tfs(struct ata_port *ap);
	94	+#else
	95	+static inline int ata_acpi_exec_tfs(struct ata_port *ap)
	96	+{
	97	+ return 0;
	98	+}
	99	+#endif
90	100
91	101	/* libata-scsi.c */
92	102	extern struct scsi_transport_template ata_scsi_transport_template;
...	...	@@ -35,6 +35,7 @@
35	35	#include <linux/ata.h>
36	36	#include <linux/workqueue.h>
37	37	#include <scsi/scsi_host.h>
	38	+#include <linux/acpi.h>
38	39
39	40	/*
40	41	* Define if arch has non-standard setup. This is a _PCI_ standard
...	...	@@ -495,6 +496,10 @@
495	496	/* error history */
496	497	struct ata_ering ering;
497	498	unsigned int horkage; /* List of broken features */
	499	+#ifdef CONFIG_SATA_ACPI
	500	+ /* ACPI objects info */
	501	+ acpi_handle obj_handle;
	502	+#endif
498	503	};
499	504
500	505	/* Offset into struct ata_device. Fields above it are maintained