svm_migrate_vram_to_ram(9)

💖 NAME 💖

okay bestie, this is svm_migrate_vram_to_ram(9), straight from the Kernel API Manual ✨ — and its whole main character job is to migrate svm range from device to system. That's the assignment, no cap. 🫶

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✨ SYNOPSIS ✨

       int svm_migrate_vram_to_ram (struct svm_range *prange , struct mm_struct
       *mm , unsigned long start_mgr , unsigned long last_mgr , uint32_t
       trigger , struct page *fault_page );

That's the exact signature, so keep it character for character if you're typing it out, fr fr. 💅

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🧚 ARGUMENTS 🧚

• prange — the range structure, aka the thing getting migrated. main character energy 💜
• mm — the process mm; if it's NULL, use current->mm. easy enough 🌀
• start_mgr — the start page that needs to be migrated to sys ram. 📌
• last_mgr — the last page that needs to be migrated to sys ram. 🏁
• trigger — the reason of migration. iykyk 👀
• fault_page — comes from vmf->page, svm_migrate_to_ram; this is the CPU page fault callback. very demure, very mindful 😭

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🌸 CONTEXT 🌸

Process context, bestie — the caller holds the mmap read lock and prange->migrate_mutex. do not forget either one, fr fr. 😤

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🎀 RETURN 🎀

0 — OK, otherwise error code. That's it. slay ✨

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🦋 SEE ALSO 🦋

• Kernel file: ./drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
• svm_migrate_copy_memory_gart(9)
• svm_migrate_copy_done(9)
• svm_migrate_ram_to_vram(9)
• svm_migrate_vma_to_ram(9)
• svm_migrate_vram_to_vram(9)
• svm_migrate_to_ram(9)

go read these too, bestie — the lore is real. 📚💅

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okay bye bestie 🫶 — source/version: ./drivers/gpu/drm/amd/amdkfd; date: October 2026. that's the whole svm_migrate_vram_to_ram(9) moment. mwah 💋