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    Subject[PATCH 8/8] libata: implement on-demand HPA unlocking
    Date
    Implement ata_scsi_unlock_native_capacity() which will be called
    through SCSI layer when block layer notices that partitions on a
    device extend beyond the end of the device. It requests EH to unlock
    HPA, waits for completion and returns the current device capacity.

    This allows libata to unlock HPA on demand instead of having to decide
    whether to unlock upfront. Unlocking on demand is safer than
    unlocking by upfront because some BIOSes write private data to the
    area beyond HPA limit. This was suggested by Ben Hutchings.

    Signed-off-by: Tejun Heo <tj@kernel.org>
    Suggested-by: Ben Hutchings <ben@decadent.org.uk>
    ---
    drivers/ata/libata-core.c | 1 +
    drivers/ata/libata-scsi.c | 29 +++++++++++++++++++++++++++++
    include/linux/libata.h | 2 ++
    3 files changed, 32 insertions(+), 0 deletions(-)

    diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
    index 9d6e92d..b0e379d 100644
    --- a/drivers/ata/libata-core.c
    +++ b/drivers/ata/libata-core.c
    @@ -6797,6 +6797,7 @@ EXPORT_SYMBOL_GPL(ata_dummy_port_info);
    EXPORT_SYMBOL_GPL(ata_link_next);
    EXPORT_SYMBOL_GPL(ata_dev_next);
    EXPORT_SYMBOL_GPL(ata_std_bios_param);
    +EXPORT_SYMBOL_GPL(ata_scsi_unlock_native_capacity);
    EXPORT_SYMBOL_GPL(ata_host_init);
    EXPORT_SYMBOL_GPL(ata_host_alloc);
    EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
    diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
    index 0088cde..fc51531 100644
    --- a/drivers/ata/libata-scsi.c
    +++ b/drivers/ata/libata-scsi.c
    @@ -415,6 +415,35 @@ int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
    }

    /**
    + * ata_scsi_unlock_native_capacity - unlock native capacity
    + * @sdev: SCSI device to adjust device capacity for
    + *
    + * This function is called if a partition on @sdev extends beyond
    + * the end of the device. It requests EH to unlock HPA.
    + *
    + * LOCKING:
    + * Defined by the SCSI layer. Might sleep.
    + */
    +void ata_scsi_unlock_native_capacity(struct scsi_device *sdev)
    +{
    + struct ata_port *ap = ata_shost_to_port(sdev->host);
    + struct ata_device *dev;
    + unsigned long flags;
    +
    + spin_lock_irqsave(ap->lock, flags);
    +
    + dev = ata_scsi_find_dev(ap, sdev);
    + if (dev && dev->n_sectors < dev->n_native_sectors) {
    + dev->flags |= ATA_DFLAG_UNLOCK_HPA;
    + dev->link->eh_info.action |= ATA_EH_RESET;
    + ata_port_schedule_eh(ap);
    + }
    +
    + spin_unlock_irqrestore(ap->lock, flags);
    + ata_port_wait_eh(ap);
    +}
    +
    +/**
    * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
    * @ap: target port
    * @sdev: SCSI device to get identify data for
    diff --git a/include/linux/libata.h b/include/linux/libata.h
    index 242eb26..ab7d6de 100644
    --- a/include/linux/libata.h
    +++ b/include/linux/libata.h
    @@ -1027,6 +1027,7 @@ extern void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
    extern int ata_std_bios_param(struct scsi_device *sdev,
    struct block_device *bdev,
    sector_t capacity, int geom[]);
    +extern void ata_scsi_unlock_native_capacity(struct scsi_device *sdev);
    extern int ata_scsi_slave_config(struct scsi_device *sdev);
    extern void ata_scsi_slave_destroy(struct scsi_device *sdev);
    extern int ata_scsi_change_queue_depth(struct scsi_device *sdev,
    @@ -1181,6 +1182,7 @@ extern struct device_attribute *ata_common_sdev_attrs[];
    .slave_configure = ata_scsi_slave_config, \
    .slave_destroy = ata_scsi_slave_destroy, \
    .bios_param = ata_std_bios_param, \
    + .unlock_native_capacity = ata_scsi_unlock_native_capacity, \
    .sdev_attrs = ata_common_sdev_attrs

    #define ATA_NCQ_SHT(drv_name) \
    --
    1.6.4.2


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