[PATCH] libata: ACPI and _GTF support (11ef697b) · Commits · 戴 / test

Documentation/kernel-parameters.txt

+5 −0

Original line number	Diff line number	Diff line
		@@ -48,6 +48,7 @@ parameter is applicable:
		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.
		@@ -1038,6 +1039,10 @@ and is between 256 and 4096 characters. It is defined in the file
		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
		impact performance on real NUMA hardware.

drivers/ata/Kconfig

+13 −0

Original line number	Diff line number	Diff line
		@@ -161,6 +161,19 @@ config SATA_INTEL_COMBINED
		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

drivers/ata/Makefile

+1 −1

Original line number	Diff line number	Diff line
		@@ -66,4 +66,4 @@ obj-$(CONFIG_ATA_GENERIC) += ata_generic.o
		obj-$(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

drivers/ata/libata-acpi.c

0 → 100644

+602 −0

Original line number	Diff line number	Diff line
		/*
		* 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) inthatorder */
		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;
		}

drivers/ata/libata-core.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -93,6 +93,10 @@ static int ata_probe_timeout = ATA_TMOUT_INTERNAL / HZ;
		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");
		@@ -1778,6 +1782,9 @@ int ata_bus_probe(struct ata_port *ap)
		/* 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];

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