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authorDan Williams <dan.j.williams@intel.com>2011-09-30 18:52:19 -0700
committerJames Bottomley <JBottomley@Parallels.com>2011-10-02 13:20:03 -0500
commitb50102d3e9a43a75379407c2080f696f61cb286b (patch)
treeb37eb5ed05f2228842c54cdac455f00ec846746e /include/scsi/libsas.h
parent4f3f812dd3b638d0c92661122dcccd6aaef66bfb (diff)
downloadop-kernel-dev-b50102d3e9a43a75379407c2080f696f61cb286b.zip
op-kernel-dev-b50102d3e9a43a75379407c2080f696f61cb286b.tar.gz
[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 'include/scsi/libsas.h')
-rw-r--r--include/scsi/libsas.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
index d455fa9..c4b7cd0 100644
--- a/include/scsi/libsas.h
+++ b/include/scsi/libsas.h
@@ -389,6 +389,11 @@ sdev_to_domain_dev(struct scsi_device *sdev) {
return starget_to_domain_dev(sdev->sdev_target);
}
+static inline struct ata_device *sas_to_ata_dev(struct domain_device *dev)
+{
+ return &dev->sata_dev.ap->link.device[0];
+}
+
static inline struct domain_device *
cmd_to_domain_dev(struct scsi_cmnd *cmd)
{
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