megasas_alloc_cmds_fusion(9)

🎀 megasas_alloc_cmds_fusion(9) 🎀

okay bestie, welcome to the Kernel API Manual entry for megasas_alloc_cmds_fusion(9) — yes that's the whole title, yes it's a mouthful, and yes we're gonna get through it together 💅

---

✨ NAME ✨

megasas_alloc_cmds_fusion — the function that allocates the command packets. that's it, that's the vibe. it makes the cmd packets exist 🫶

---

🌸 SYNOPSIS 🌸

int megasas_alloc_cmds_fusion (struct megasas_instance *instance );

---

🦋 ARGUMENTS 🦋

• instance — the adapter soft state. the main character of this whole story fr fr 💖

---

👑 DESCRIPTION 👑

okay so, context time (literally). every frame has a 32-bit field called context. what's it for? it's how you get back to the megasas_cmd_fusion from the frame once that frame gets completed. like a little find-my-friends beacon for your command 🔥

in this driver, those 32-bit values are the indices into an array called cmd_list. and cmd_list has exactly one job, no cap: look up the megasas_cmd_fusion given the context. that's the whole assignment, it's giving very narrow scope, and honestly? iconic.

the free commands themselves hang out somewhere else entirely — they're kept in a linked list called cmd_pool. so like, the array is the lookup table and the linked list is the hangout spot for available cmds 🧚

the cmds get formed in the io_request and sg_frame members of the megasas_cmd_fusion. then the context field is used to get a request descriptor, and it also gets used as the SMID of the cmd. the SMID value range is 1 to max_fw_cmds — that's the boundary, bestie, do not go wandering outside it ⭐

---

💜 SEE ALSO 💜

• the kernel file ./drivers/scsi/megaraid/megaraid_sas_fusion.c — go read the source, it's right there 😌
• megasas_adp_reset_wait_for_ready(9)
• megasas_check_same_4gb_region(9)
• megasas_enable_intr_fusion(9)
• megasas_disable_intr_fusion(9)
• megasas_get_cmd_fusion(9)
• megasas_return_cmd_fusion(9)
• megasas_write_64bit_req_desc(9)
• megasas_fire_cmd_fusion(9)
• megasas_fusion_update_can_queue(9)
• megasas_free_cmds_fusion(9)
• megasas_create_sg_sense_fusion(9)
• wait_and_poll(9)
• megasas_ioc_init_fusion(9)
• megasas_sync_pd_seq_num(9)
• megasas_allocate_raid_maps(9)
• megasas_configure_queue_sizes(9)
• megasas_free_ioc_init_cmd(9)
• megasas_init_adapter_fusion(9)
• megasas_fault_detect_work(9)
• map_cmd_status(9)
• megasas_is_prp_possible(9)
• megasas_make_prp_nvme(9)
• megasas_make_sgl_fusion(9)
• megasas_make_sgl(9)
• megasas_set_pd_lba(9)
• megasas_stream_detect(9)
• megasas_set_raidflag_cpu_affinity(9)
• megasas_build_ldio_fusion(9)
• megasas_build_ld_nonrw_fusion(9)
• megasas_build_syspd_fusion(9)
• megasas_build_io_fusion(9)
• megasas_build_and_issue_cmd_fusion(9)
• megasas_complete_r1_command(9)
• access_irq_context(9)
• release_irq_context(9)
• complete_cmd_fusion(9)
• megasas_enable_irq_poll(9)
• megasas_sync_irqs(9)
• megasas_irqpoll(9)
• megasas_complete_cmd_dpc_fusion(9)
• megasas_isr_fusion(9)
• build_mpt_mfi_pass_thru(9)
• build_mpt_cmd(9)
• megasas_issue_dcmd_fusion(9)
• megasas_release_fusion(9)
• megasas_read_fw_status_reg_fusion(9)
• megasas_alloc_host_crash_buffer(9)
• megasas_free_host_crash_buffer(9)
• megasas_adp_reset_fusion(9)
• megasas_check_reset_fusion(9)
• megasas_trigger_snap_dump(9)
• megasas_tm_response_code(9)
• megasas_issue_tm(9)

---

bestie that's 53 cross-references. fifty-three. we read every single one, we did not skip, we ate and left no crumbs 🍓

---

🌈 the sign-off 🌈

this whole little masterpiece lives down in ./drivers/scsi/megaraid, and it's dated October 2026 — yes, future-dated, she's ahead of her time, main character energy only 👑✨

mwah, go allocate those command packets responsibly 💖🎀🦋