![Aaron Lu](/assets/img/avatar_default.png)
Binding ACPI handle to SCSI device has several drawbacks, namely: 1 During ATA device initialization time, ACPI handle will be needed while SCSI devices are not created yet. So each time ACPI handle is needed, instead of retrieving the handle by ACPI_HANDLE macro, a namespace scan is performed to find the handle for the corresponding ATA device. This is inefficient, and also expose a restriction on calling path not holding any lock. 2 The binding to SCSI device tree makes code complex, while at the same time doesn't bring us any benefit. All ACPI handlings are still done in ATA module, not in SCSI. Rework the ATA ACPI binding code to bind ACPI handle to ATA transport devices(ATA port and ATA device). The binding needs to be done only once, since the ATA transport devices do not go away with hotplug. And due to this, the flush_work call in hotplug handler for ATA bay is no longer needed. Tested on an Intel test platform for binding and runtime power off for ODD(ZPODD) and hard disk; on an ASUS S400C for binding and normal boot and S3, where its SATA port node has _SDD and _GTF control methods when configured as an AHCI controller and its PATA device node has _GTF control method when configured as an IDE controller. SATA PMP binding and ATA hotplug is not tested. Signed-off-by: Aaron Lu <aaron.lu@intel.com> Tested-by: Dirk Griesbach <spamthis@freenet.de> Signed-off-by: Tejun Heo <tj@kernel.org>
303 lines
7.4 KiB
C
303 lines
7.4 KiB
C
#include <linux/libata.h>
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#include <linux/cdrom.h>
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#include <linux/pm_runtime.h>
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#include <linux/module.h>
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#include <linux/pm_qos.h>
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#include <scsi/scsi_device.h>
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#include "libata.h"
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static int zpodd_poweroff_delay = 30; /* 30 seconds for power off delay */
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module_param(zpodd_poweroff_delay, int, 0644);
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MODULE_PARM_DESC(zpodd_poweroff_delay, "Poweroff delay for ZPODD in seconds");
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enum odd_mech_type {
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ODD_MECH_TYPE_SLOT,
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ODD_MECH_TYPE_DRAWER,
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ODD_MECH_TYPE_UNSUPPORTED,
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};
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struct zpodd {
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enum odd_mech_type mech_type; /* init during probe, RO afterwards */
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struct ata_device *dev;
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/* The following fields are synchronized by PM core. */
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bool from_notify; /* resumed as a result of
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* acpi wake notification */
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bool zp_ready; /* ZP ready state */
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unsigned long last_ready; /* last ZP ready timestamp */
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bool zp_sampled; /* ZP ready state sampled */
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bool powered_off; /* ODD is powered off
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* during suspend */
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};
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static int eject_tray(struct ata_device *dev)
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{
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struct ata_taskfile tf;
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const char cdb[] = { GPCMD_START_STOP_UNIT,
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0, 0, 0,
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0x02, /* LoEj */
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0, 0, 0, 0, 0, 0, 0,
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};
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ata_tf_init(dev, &tf);
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tf.flags = ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
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tf.command = ATA_CMD_PACKET;
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tf.protocol = ATAPI_PROT_NODATA;
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return ata_exec_internal(dev, &tf, cdb, DMA_NONE, NULL, 0, 0);
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}
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/* Per the spec, only slot type and drawer type ODD can be supported */
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static enum odd_mech_type zpodd_get_mech_type(struct ata_device *dev)
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{
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char buf[16];
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unsigned int ret;
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struct rm_feature_desc *desc = (void *)(buf + 8);
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struct ata_taskfile tf;
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char cdb[] = { GPCMD_GET_CONFIGURATION,
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2, /* only 1 feature descriptor requested */
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0, 3, /* 3, removable medium feature */
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0, 0, 0,/* reserved */
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0, sizeof(buf),
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0, 0, 0,
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};
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ata_tf_init(dev, &tf);
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tf.flags = ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
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tf.command = ATA_CMD_PACKET;
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tf.protocol = ATAPI_PROT_PIO;
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tf.lbam = sizeof(buf);
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ret = ata_exec_internal(dev, &tf, cdb, DMA_FROM_DEVICE,
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buf, sizeof(buf), 0);
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if (ret)
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return ODD_MECH_TYPE_UNSUPPORTED;
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if (be16_to_cpu(desc->feature_code) != 3)
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return ODD_MECH_TYPE_UNSUPPORTED;
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if (desc->mech_type == 0 && desc->load == 0 && desc->eject == 1)
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return ODD_MECH_TYPE_SLOT;
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else if (desc->mech_type == 1 && desc->load == 0 && desc->eject == 1)
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return ODD_MECH_TYPE_DRAWER;
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else
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return ODD_MECH_TYPE_UNSUPPORTED;
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}
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static bool odd_can_poweroff(struct ata_device *ata_dev)
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{
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acpi_handle handle;
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acpi_status status;
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struct acpi_device *acpi_dev;
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handle = ata_dev_acpi_handle(ata_dev);
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if (!handle)
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return false;
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status = acpi_bus_get_device(handle, &acpi_dev);
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if (ACPI_FAILURE(status))
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return false;
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return acpi_device_can_poweroff(acpi_dev);
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}
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/* Test if ODD is zero power ready by sense code */
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static bool zpready(struct ata_device *dev)
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{
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u8 sense_key, *sense_buf;
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unsigned int ret, asc, ascq, add_len;
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struct zpodd *zpodd = dev->zpodd;
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ret = atapi_eh_tur(dev, &sense_key);
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if (!ret || sense_key != NOT_READY)
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return false;
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sense_buf = dev->link->ap->sector_buf;
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ret = atapi_eh_request_sense(dev, sense_buf, sense_key);
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if (ret)
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return false;
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/* sense valid */
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if ((sense_buf[0] & 0x7f) != 0x70)
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return false;
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add_len = sense_buf[7];
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/* has asc and ascq */
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if (add_len < 6)
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return false;
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asc = sense_buf[12];
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ascq = sense_buf[13];
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if (zpodd->mech_type == ODD_MECH_TYPE_SLOT)
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/* no media inside */
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return asc == 0x3a;
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else
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/* no media inside and door closed */
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return asc == 0x3a && ascq == 0x01;
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}
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/*
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* Update the zpodd->zp_ready field. This field will only be set
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* if the ODD has stayed in ZP ready state for zpodd_poweroff_delay
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* time, and will be used to decide if power off is allowed. If it
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* is set, it will be cleared during resume from powered off state.
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*/
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void zpodd_on_suspend(struct ata_device *dev)
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{
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struct zpodd *zpodd = dev->zpodd;
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unsigned long expires;
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if (!zpready(dev)) {
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zpodd->zp_sampled = false;
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zpodd->zp_ready = false;
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return;
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}
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if (!zpodd->zp_sampled) {
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zpodd->zp_sampled = true;
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zpodd->last_ready = jiffies;
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return;
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}
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expires = zpodd->last_ready +
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msecs_to_jiffies(zpodd_poweroff_delay * 1000);
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if (time_before(jiffies, expires))
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return;
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zpodd->zp_ready = true;
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}
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bool zpodd_zpready(struct ata_device *dev)
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{
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struct zpodd *zpodd = dev->zpodd;
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return zpodd->zp_ready;
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}
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/*
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* Enable runtime wake capability through ACPI and set the powered_off flag,
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* this flag will be used during resume to decide what operations are needed
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* to take.
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*
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* Also, media poll needs to be silenced, so that it doesn't bring the ODD
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* back to full power state every few seconds.
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*/
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void zpodd_enable_run_wake(struct ata_device *dev)
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{
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struct zpodd *zpodd = dev->zpodd;
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sdev_disable_disk_events(dev->sdev);
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zpodd->powered_off = true;
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device_set_run_wake(&dev->tdev, true);
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acpi_pm_device_run_wake(&dev->tdev, true);
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}
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/* Disable runtime wake capability if it is enabled */
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void zpodd_disable_run_wake(struct ata_device *dev)
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{
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struct zpodd *zpodd = dev->zpodd;
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if (zpodd->powered_off) {
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acpi_pm_device_run_wake(&dev->tdev, false);
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device_set_run_wake(&dev->tdev, false);
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}
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}
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/*
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* Post power on processing after the ODD has been recovered. If the
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* ODD wasn't powered off during suspend, it doesn't do anything.
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*
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* For drawer type ODD, if it is powered on due to user pressed the
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* eject button, the tray needs to be ejected. This can only be done
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* after the ODD has been recovered, i.e. link is initialized and
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* device is able to process NON_DATA PIO command, as eject needs to
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* send command for the ODD to process.
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*
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* The from_notify flag set in wake notification handler function
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* zpodd_wake_dev represents if power on is due to user's action.
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*
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* For both types of ODD, several fields need to be reset.
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*/
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void zpodd_post_poweron(struct ata_device *dev)
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{
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struct zpodd *zpodd = dev->zpodd;
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if (!zpodd->powered_off)
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return;
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zpodd->powered_off = false;
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if (zpodd->from_notify) {
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zpodd->from_notify = false;
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if (zpodd->mech_type == ODD_MECH_TYPE_DRAWER)
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eject_tray(dev);
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}
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zpodd->zp_sampled = false;
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zpodd->zp_ready = false;
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sdev_enable_disk_events(dev->sdev);
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}
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static void zpodd_wake_dev(acpi_handle handle, u32 event, void *context)
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{
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struct ata_device *ata_dev = context;
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struct zpodd *zpodd = ata_dev->zpodd;
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struct device *dev = &ata_dev->sdev->sdev_gendev;
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if (event == ACPI_NOTIFY_DEVICE_WAKE && pm_runtime_suspended(dev)) {
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zpodd->from_notify = true;
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pm_runtime_resume(dev);
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}
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}
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static void ata_acpi_add_pm_notifier(struct ata_device *dev)
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{
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acpi_handle handle = ata_dev_acpi_handle(dev);
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acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
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zpodd_wake_dev, dev);
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}
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static void ata_acpi_remove_pm_notifier(struct ata_device *dev)
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{
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acpi_handle handle = ata_dev_acpi_handle(dev);
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acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, zpodd_wake_dev);
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}
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void zpodd_init(struct ata_device *dev)
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{
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enum odd_mech_type mech_type;
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struct zpodd *zpodd;
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if (dev->zpodd)
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return;
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if (!odd_can_poweroff(dev))
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return;
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mech_type = zpodd_get_mech_type(dev);
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if (mech_type == ODD_MECH_TYPE_UNSUPPORTED)
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return;
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zpodd = kzalloc(sizeof(struct zpodd), GFP_KERNEL);
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if (!zpodd)
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return;
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zpodd->mech_type = mech_type;
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ata_acpi_add_pm_notifier(dev);
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zpodd->dev = dev;
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dev->zpodd = zpodd;
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dev_pm_qos_expose_flags(&dev->tdev, 0);
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}
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void zpodd_exit(struct ata_device *dev)
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{
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ata_acpi_remove_pm_notifier(dev);
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kfree(dev->zpodd);
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dev->zpodd = NULL;
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}
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