pci_max_pasids(9)

✨ pci_max_pasids ✨

okay so bestie, welcome to the pci_max_pasids(9) page from the Kernel API Manual 💅 this one is short and sweet and honestly kind of iconic for it.

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🌸 NAME 🌸

pci_max_pasids — literally just: get the maximum number of PASIDs supported by a device. that's the whole vibe 🎀

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🦋 SYNOPSIS 🦋

int pci_max_pasids (struct pci_dev *pdev );

like, one function, one struct pointer, no drama. periodt.

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💖 ARGUMENTS 💖

• pdev — the PCI device structure 🫶 that's your device, bestie, the one you're asking about.

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🔥 DESCRIPTION 🔥

okay so here's the tea ☕ — if the PASID capability is not present, this returns a negative value. no capability, no PASIDs, sorry babe 😭

otherwise? it returns the number of supported PASIDs ✨ like, the actual count. that's it, that's the function, she's lowkey simple and we love her for it.

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👑 SEE ALSO 👑

bestie there are SO many siblings in this family, brace yourself 💀 the kernel file lives at ./drivers/pci/ats.c and here's the whole crew:

• pci_ats_supported(9)
• pci_prepare_ats(9)
• pci_enable_ats(9)
• pci_disable_ats(9)
• pci_ats_queue_depth(9)
• pci_ats_page_aligned(9)
• pci_ats_required(9)
• pci_enable_pri(9)
• pci_disable_pri(9)
• pci_restore_pri_state(9)
• pci_reset_pri(9)
• pci_prg_resp_pasid_required(9)
• pci_pri_supported(9)
• pci_enable_pasid(9)
• pci_disable_pasid(9)
• pci_restore_pasid_state(9)
• pci_pasid_features(9)
• pci_pasid_status(9)

ngl that's a whole group chat right there 🌈 go read them too, iykyk 💜

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and that's the page!! brought to you from ./drivers/pci 🧚 dated October 2026, version vibes included, mwah 💋⭐