megasas_set_dma_settings(9)

📦 version 7.3.1, in nixpkgs unstable

💅 megasas_set_dma_settings — a Kernel API Manual moment (section 9, bestie)

Okay so picture this: you're deep in the megaraid_sas driver, section 9 of the Kernel API Manual, and you just need the DCMD to know where its DMA buffer lives. That's literally this function. It's the little helper that handles the ✨ logistics ✨ so the rest of the driver can be the main character.

🌸 NAME 🌸

megasas_set_dma_settings — populate DMA address, length and flags for DCMDs. That's it, that's the whole vibe. It fills in the DMA deets on a DCMD frame. Iconic, lowkey essential, no cap. 🎀

✨ SYNOPSIS ✨

void megasas_set_dma_settings (struct megasas_instance *instance ,
struct megasas_dcmd_frame *dcmd , dma_addr_t dma_addr , u32 dma_len );

Notice the void up front — she returns nothing and she's at peace with that. 🫶

🦋 ARGUMENTS 🦋

Four args, four besties, all of them pulling up to the function with a job:

  • instance — the adapter soft state. Your controller's whole personality and current situation, in struct form. 💖
  • dcmd — the DCMD frame inside the MFI command. This is the thing that's about to get its DMA settings set, so like, she's the reason we're all here. 🎀
  • dma_addr — the DMA address of the buffer that's getting passed to the FW. The "where is it" of it all. 📍
  • dma_len — the length of that DMA buffer being passed to the FW. The "how big though" of it all. 📏

🌈 RETURN 🌈

void. Nothing. Nada. She gives, but she does not give back. 😌 (Still slayed, obviously.)

👑 SEE ALSO 👑

🧚 The kernel file

  • ./drivers/scsi/megaraid/megaraid_sas_base.c — the actual kernel file, iykyk. Go read it, it's literally right there.

💜 The whole extended friend group

And now the part where I introduce every single one of her mutuals, because nobody gets left out of the SEE ALSO list. Not one. This is the group chat roster, bestie:

That's the roster. Every single one. Don't make me tap the sign. 💀

🫶 Friendly reminder that this page lives under the source directory ./drivers/scsi/megaraid, dated October 2026, part of the Kernel API Manual. Screenshot it, cite it, print it out and put it on your wall like the little collector's item it is. Byeee 💖✨🌸
📦 where this page comes from