__drm_pagema...grate_to_ram(9)

💅 __drm_pagema...grate_to_ram(9) 💅

okay so bestie, welcome to the Kernel API Manual, and specifically to this little internal icon, __drm_pagemap_migrate_to_ram. yes the header truncates it, yes it's giving "my name didn't fit in the group chat nickname field," we move.

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✨ NAME ✨

__drm_pagemap_migrate_to_ram — migrate a GPU SVM range to RAM, but make it internal 🫶

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🌸 SYNOPSIS 🌸

int __drm_pagemap_migrate_to_ram (struct vm_area_struct *vas , struct page *page , unsigned long fault_addr , unsigned long size );

like, that's the whole vibe right there, no cap.

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🎀 ARGUMENTS 🎀

• vas — pointer to the VM area structure. literally the struct vm_area_struct, the main character of the address space.
• page — pointer to the page being handled for the fault. the one going through it rn 😭
• fault_addr — the fault address. yes bestie, exactly what it says.
• size — size of the migration. how much we're moving, periodt.

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🦋 DESCRIPTION 🦋

so this is an internal function (iykyk, not for you to call directly, it's a backstage-pass situation) and what it does is perform the migration of the specified GPU SVM range to RAM. the way it does that:

• it sets up the migration,
• populates + dma maps RAM PFNs,
• and then invokes the driver-specific operations for migration to RAM.

that's the whole pipeline, slay. 🔥

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⭐ RETURN ⭐

0 on success, negative error code on failure. so like, zero is the good ending 💖 and anything negative means something went off, check it.

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🌈 SEE ALSO 🌈

bestie there are SO many siblings, buckle up 🧚:

• Kernel file ./drivers/gpu/drm/drm_pagemap.c
• Overview(9)
• Migration(9)
• struct drm_pagemap_zdd(9)
• drm_pagemap_zdd_alloc(9)
• drm_pagemap_zdd_get(9)
• drm_pagemap_zdd_destroy(9)
• drm_pagemap_zdd_put(9)
• drm_pagemap_migration_unlock_put_folio(9)
• drm_pagemap_migration_unlock_put_pages(9)
• drm_pagemap_get_devmem_page(9)
• drm_pagemap_migrate_map_device_private_pages(9)
• struct drm_pagemap_iova_state(9)
• drm_pagemap_migrate_map_system_pages(9)
• drm_pagemap_migrate_populate_src_pages(9)
• drm_pagemap_migrate_unmap_pages(9)
• struct migrate_range_loc(9)
• drm_pagemap_cpages(9)
• drm_pagemap_migrate_to_devmem(9)
• drm_pagemap_migrate_populate_ram_pfn(9)
• struct drm_pagemap_dev_hold(9)
• drm_pagemap_reinit(9)
• drm_pagemap_init(9)
• drm_pagemap_put(9)
• drm_pagemap_page_get_flags(9)
• drm_pagemap_page_set_flags(9)
• drm_pagemap_retire_migrated_pages(9)
• drm_pagemap_skip_retired_pages(9)
• drm_pagemap_evict_to_ram(9)
• drm_pagemap_folio_free(9)
• drm_pagemap_migrate_to_ram(9)
• drm_pagemap_pagemap_ops_get(9)
• drm_pagemap_devmem_init(9)
• drm_pagemap_page_to_dpagemap(9)
• drm_pagemap_populate_mm(9)

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ok that's the whole page, no notes 💅 go read the friends, they ate.

and finally, the cute little sign-off: this one lives in ./drivers/gpu/drm (yes, that's the source/version line bestie), dated October 2026, and the footer is also __drm_pagema...grate_to_ram(9) because the truncation is iconic at this point. bye pookie, happy migrating 💜🎀