i915_memcpy_from_wc(9)

💖 i915_memcpy_from_wc 💖

okay bestie, this page comes from the Kernel API Manual, and the main character is i915_memcpy_from_wc(9) — manual name folded in right here, slay ✨

🌸 NAME 🌸

i915_memcpy_from_wc — perform an accelerated aligned read from WC 💅

✨ SYNOPSIS ✨

bool i915_memcpy_from_wc (void *dst , const void *src , unsigned long
       len );

🎀 ARGUMENTS 🎀

• dst — destination pointer, aka where the copied bytes are headed 🫶
• src — source pointer, aka where the bytes are coming from 💖
• len — how many bytes to copy, literally the byte count 🧚

🦋 DESCRIPTION 🦋

okay so i915_memcpy_from_wc copies len bytes from src to dst using non-temporal instructions where available. Highkey accelerated. ✨

bestie, the preconditions are not a vibe check you can skip: all arguments (src, dst) must be aligned to 16 bytes, and len must be a multiple of 16. No cap. 💅

To test whether accelerated reads from WC are supported, use this exact call:

i915_memcpy_from_wc(NULL, NULL, 0);

It returns true if the copy was successful, and false if the preconditions are not met. That's the whole mood. 😭

🌈 SEE ALSO 🌈

• Kernel file: ./drivers/gpu/drm/i915/i915_memcpy.c 👑
• i915_unaligned_memcpy_from_wc(9) — the unaligned bestie in the see-also section 🦋

and that's the page, bestie 💖 the source/version line is ./drivers/gpu/drm/i915, dated October 2026, and we are so done here 💅✨