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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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b50102d3e9
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> |
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| .. | ||
| firmware | ||
| host.c | ||
| host.h | ||
| init.c | ||
| isci.h | ||
| Makefile | ||
| phy.c | ||
| phy.h | ||
| port_config.c | ||
| port.c | ||
| port.h | ||
| probe_roms.c | ||
| probe_roms.h | ||
| registers.h | ||
| remote_device.c | ||
| remote_device.h | ||
| remote_node_context.c | ||
| remote_node_context.h | ||
| remote_node_table.c | ||
| remote_node_table.h | ||
| request.c | ||
| request.h | ||
| sas.h | ||
| scu_completion_codes.h | ||
| scu_event_codes.h | ||
| scu_remote_node_context.h | ||
| scu_task_context.h | ||
| task.c | ||
| task.h | ||
| unsolicited_frame_control.c | ||
| unsolicited_frame_control.h | ||