diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/DMA-mapping.txt | 12 | ||||
| -rw-r--r-- | Documentation/scsi/scsi_mid_low_api.txt | 44 |
2 files changed, 3 insertions, 53 deletions
diff --git a/Documentation/DMA-mapping.txt b/Documentation/DMA-mapping.txt index f4ac37f157e..684557474c1 100644 --- a/Documentation/DMA-mapping.txt +++ b/Documentation/DMA-mapping.txt @@ -443,15 +443,9 @@ Only streaming mappings specify a direction, consistent mappings implicitly have a direction attribute setting of PCI_DMA_BIDIRECTIONAL. -The SCSI subsystem provides mechanisms for you to easily obtain -the direction to use, in the SCSI command: - - scsi_to_pci_dma_dir(SCSI_DIRECTION) - -Where SCSI_DIRECTION is obtained from the 'sc_data_direction' -member of the SCSI command your driver is working on. The -mentioned interface above returns a value suitable for passing -into the streaming DMA mapping interfaces below. +The SCSI subsystem tells you the direction to use in the +'sc_data_direction' member of the SCSI command your driver is +working on. For Networking drivers, it's a rather simple affair. For transmit packets, map/unmap them with the PCI_DMA_TODEVICE direction diff --git a/Documentation/scsi/scsi_mid_low_api.txt b/Documentation/scsi/scsi_mid_low_api.txt index 1f24129a309..e41703d7d24 100644 --- a/Documentation/scsi/scsi_mid_low_api.txt +++ b/Documentation/scsi/scsi_mid_low_api.txt @@ -389,8 +389,6 @@ Summary: scsi_remove_host - detach and remove all SCSI devices owned by host scsi_report_bus_reset - report scsi _bus_ reset observed scsi_set_device - place device reference in host structure - scsi_to_pci_dma_dir - convert SCSI subsystem direction flag to PCI - scsi_to_sbus_dma_dir - convert SCSI subsystem direction flag to SBUS scsi_track_queue_full - track successive QUEUE_FULL events scsi_unblock_requests - allow further commands to be queued to given host scsi_unregister - [calls scsi_host_put()] @@ -757,48 +755,6 @@ void scsi_set_device(struct Scsi_Host * shost, struct device * dev) /** - * scsi_to_pci_dma_dir - convert SCSI subsystem direction flag to PCI - * @scsi_data_direction: SCSI subsystem direction flag - * - * Returns DMA_TO_DEVICE given SCSI_DATA_WRITE, - * DMA_FROM_DEVICE given SCSI_DATA_READ - * DMA_BIDIRECTIONAL given SCSI_DATA_UNKNOWN - * else returns DMA_NONE - * - * Might block: no - * - * Notes: The SCSI subsystem now uses the same values for these - * constants as the PCI subsystem so this function is a nop. - * The recommendation is not to use this conversion function anymore - * (in the 2.6 kernel series) as it is not needed. - * - * Defined in: drivers/scsi/scsi.h . - **/ -int scsi_to_pci_dma_dir(unsigned char scsi_data_direction) - - -/** - * scsi_to_sbus_dma_dir - convert SCSI subsystem direction flag to SBUS - * @scsi_data_direction: SCSI subsystem direction flag - * - * Returns DMA_TO_DEVICE given SCSI_DATA_WRITE, - * FROM_DEVICE given SCSI_DATA_READ - * DMA_BIDIRECTIONAL given SCSI_DATA_UNKNOWN - * else returns DMA_NONE - * - * Notes: The SCSI subsystem now uses the same values for these - * constants as the SBUS subsystem so this function is a nop. - * The recommendation is not to use this conversion function anymore - * (in the 2.6 kernel series) as it is not needed. - * - * Might block: no - * - * Defined in: drivers/scsi/scsi.h . - **/ -int scsi_to_sbus_dma_dir(unsigned char scsi_data_direction) - - -/** * scsi_track_queue_full - track successive QUEUE_FULL events on given * device to determine if and when there is a need * to adjust the queue depth on the device. |