pci_p2pmem_virt_to_bus(9)

💫 pci_p2pmem_virt_to_bus(9) — the Kernel API Manual glow-up 💫

Okay bestie, so this one lives in the Kernel API Manual (section 9, kernel-town energy 🌈), and it's literally the little helper that hands you back a PCI bus address when all you've got is a virtual address. No cap.

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✨ NAME ✨

pci_p2pmem_virt_to_bus — returns the PCI bus address for a given virtual address that you got from pci_alloc_p2pmem(). That's it, that's the whole vibe 🎀

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🦋 SYNOPSIS 🦋

pci_bus_addr_t pci_p2pmem_virt_to_bus (struct pci_dev *pdev , void *addr );

Look at her. Short, iconic, knows what she wants 🤌

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🌸 ARGUMENTS 🌸

• pdev — the device the memory was allocated from. Like, the actual origin story of this memory, bestie 👑
• addr — address of the memory that was allocated. The virtual one. The one you're holding rn 💅

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🫶 SEE ALSO 🫶

The whole friend group lives in the kernel file ./drivers/pci/p2pdma.c — go say hi to all of them:

• pcim_p2pdma_init(9)
• pcim_p2pdma_provider(9)
• pci_p2pdma_add_resource(9)
• pci_p2pdma_distance_many(9)
• pci_has_p2pmem(9)
• pci_p2pmem_find_many(9)
• pci_alloc_p2pmem(9)
• pci_free_p2pmem(9)
• pci_p2pmem_alloc_sgl(9)
• pci_p2pmem_free_sgl(9)
• pci_p2pmem_publish(9)
• pci_p2pdma_map_type(9)
• pci_p2pdma_enable_store(9)
• pci_p2pdma_enable_show(9)

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Fr fr: if you didn't get your virtual address from pci_alloc_p2pmem(), this function is not the moment. Read the NAME section again, iykyk 🌟

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And that's the page, diva 💜 Straight outta ./drivers/pci, dated October 2026, served fresh from the Kernel API Manual — slay responsibly, and may all your bus addresses be correct the first time 🧚⭐