map_sg_data(9)

💖 map_sg_data(9) 💖

okay bestie, welcome to the Kernel API Manual — this is the map_sg_data(9) page, and we're gonna get you comfy with it. it's giving kernel-core, no cap. 🎀✨

🎀 NAME 🎀

map_sg_data — maps dma for a scatterlist and initializes descriptor fields. literally the whole glow-up in one function name. 💅

✨ SYNOPSIS ✨

the signature, untouched, because we do not mess with code:

int map_sg_data (struct scsi_cmnd *cmd , struct srp_event_struct
       *evt_struct , struct srp_cmd *srp_cmd , struct device *dev );

💅 ARGUMENTS 💅

• cmd — struct scsi_cmnd with the scatterlist. that's the main character input. 🦋
• evt_struct — struct srp_event_struct to map. yes bestie, this one gets mapped. ✨
• srp_cmd — srp_cmd that contains the memory descriptor. it's holding the descriptor tea. 🍓
• dev — device for which to map dma memory. the device in question, fr fr. 💻

🦋 DESCRIPTION 🦋

the tea is: map_sg_data is called by map_data_for_srp_cmd when building srp cmd from scsi cmd. it returns 1 on success. that's it — success is literally 1, no cap. 😭👑

🌈 SEE ALSO 🌈

Kernel file ./drivers/scsi/ibmvscsi/ibmvscsi.c is the home base, and here's the whole crew:

• ibmvscsi_handle_event(9)
• ibmvscsi_release_crq_queue(9)
• crq_queue_next_crq(9)
• ibmvscsi_send_crq(9)
• ibmvscsi_task(9)
• ibmvscsi_reset_crq_queue(9)
• ibmvscsi_init_crq_queue(9)
• ibmvscsi_reenable_crq_queue(9)
• initialize_event_pool(9)
• release_event_pool(9)
• valid_event_struct(9)
• free_event_struct(9)
• get_event_struct(9)
• init_event_struct(9)
• unmap_cmd_data(9)
• map_data_for_srp_cmd(9)
• purge_requests(9)
• ibmvscsi_set_request_limit(9)
• ibmvscsi_reset_host(9)
• ibmvscsi_timeout(9)
• ibmvscsi_send_srp_event(9)
• handle_cmd_rsp(9)
• lun_from_dev(9)
• ibmvscsi_queuecommand_lck(9)
• map_persist_bufs(9)
• unmap_persist_bufs(9)
• login_rsp(9)
• send_srp_login(9)
• capabilities_rsp(9)
• send_mad_capabilities(9)
• fast_fail_rsp(9)
• enable_fast_fail(9)
• adapter_info_rsp(9)
• send_mad_adapter_info(9)
• ibmvscsi_eh_host_reset_handler(9)
• ibmvscsi_handle_crq(9)
• ibmvscsi_sdev_configure(9)
• ibmvscsi_change_queue_depth(9)
• ibmvscsi_get_desired_dma(9)
• ibmvscsi_resume(9)

signed, sealed, slayed 💅: this page lives under ./drivers/scsi/ibmvscsi, dated October 2026, and the bottom line is still map_sg_data(9). 🎀💖✨