diff options
| author | Dan Williams <dan.j.williams@intel.com> | 2011-09-30 18:52:19 -0700 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2011-10-02 13:20:03 -0500 |
| commit | b50102d3e9a43a75379407c2080f696f61cb286b (patch) | |
| tree | b37eb5ed05f2228842c54cdac455f00ec846746e /drivers/scsi/isci/remote_device.h | |
| parent | 4f3f812dd3b638d0c92661122dcccd6aaef66bfb (diff) | |
[SCSI] isci: atapi support
Based on original implementation from Jiangbi Liu and Maciej Trela.
ATAPI transfers happen in two-to-three stages. The two stage atapi
commands are those that include a dma data transfer. The data transfer
portion of these operations is handled by the hardware packet-dma
acceleration. The three-stage commands do not have a data transfer and
are handled without hardware assistance in raw frame mode.
stage1: transmit host-to-device fis to notify the device of an incoming
atapi cdb. Upon reception of the pio-setup-fis repost the task_context
to perform the dma transfer of the cdb+data (go to stage3), or repost
the task_context to transmit the cdb as a raw frame (go to stage 2).
stage2: wait for hardware notification of the cdb transmission and then
go to stage 3.
stage3: wait for the arrival of the terminating device-to-host fis and
terminate the command.
To keep the implementation simple we only support ATAPI packet-dma
protocol (for commands with data) to avoid needing to handle the data
transfer manually (like we do for SATA-PIO). This may affect
compatibility for a small number of devices (see
ATA_HORKAGE_ATAPI_MOD16_DMA).
If the data-transfer underruns, or encounters an error the
device-to-host fis is expected to arrive in the unsolicited frame queue
to pass to libata for disposition. However, in the DONE_UNEXP_FIS (data
underrun) case it appears we need to craft a response. In the
DONE_REG_ERR case we do receive the UF and propagate it to libsas.
Signed-off-by: Maciej Trela <maciej.trela@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/isci/remote_device.h')
| -rw-r--r-- | drivers/scsi/isci/remote_device.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/scsi/isci/remote_device.h b/drivers/scsi/isci/remote_device.h index 57ccfc3d6ad..e1747ea0d0e 100644 --- a/drivers/scsi/isci/remote_device.h +++ b/drivers/scsi/isci/remote_device.h @@ -244,6 +244,15 @@ enum sci_remote_device_states { SCI_STP_DEV_NCQ_ERROR, /** + * This is the ATAPI error state for the STP ATAPI remote device. + * This state is entered when ATAPI device sends error status FIS + * without data while the device object is in CMD state. + * A suspension event is expected in this state. + * The device object will resume right away. + */ + SCI_STP_DEV_ATAPI_ERROR, + + /** * This is the READY substate indicates the device is waiting for the RESET task * coming to be recovered from certain hardware specific error. */ |