amdgpu_debug...s_pcie_write(9)

okay bestie, welcome to the Kernel API Manual, section 9 — this is amdgpu_debug...s_pcie_write(9), and we're about to make PCIE register writes make sense. no cap. 🦋

🌸 NAME 🌸

amdgpu_debugfs_regs_pcie_write — Write to a PCIE register. literally the function's whole personality. 💅

✨ SYNOPSIS ✨

the signature is giving:

       ssize_t amdgpu_debugfs_regs_pcie_write (struct file *f , const char
       __user *buf , size_t size , loff_t *pos );

🎀 ARGUMENTS 🎀

• f — open file handle, bestie. the handle that's already open.
• buf — User buffer to write data from. that's where the bytes are coming from.
• size — Number of bytes to write. how many bytes we're moving.
• pos — Offset to seek to. where we're parking the cursor.

💖 DESCRIPTION 💖

the lower bits are the BYTE offset of the register to write. yes, BYTE offset — that detail is doing main character work.

This allows writing multiple registers in a single call and having the returned size reflect that. periodt. 🔥

👑 SEE ALSO 👑

go read these next, iykyk:

• Kernel file ./drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
• amdgpu_debugfs_process_reg_op(9)
• amdgpu_debugfs_regs_pcie_read(9)
• amdgpu_debugfs_regs_pcie64_read(9)
• amdgpu_debugfs_regs_pcie64_write(9)
• amdgpu_debugfs_regs_didt_read(9)
• amdgpu_debugfs_regs_didt_write(9)
• amdgpu_debugfs_regs_smc_read(9)
• amdgpu_debugfs_regs_smc_write(9)
• amdgpu_debugfs_gca_config_read(9)
• amdgpu_debugfs_sensor_read(9)
• amdgpu_debugfs_gfxoff_residency_read(9)
• amdgpu_debugfs_gfxoff_residency_write(9)
• amdgpu_debugfs_gfxoff_count_read(9)
• amdgpu_debugfs_gfxoff_write(9)
• amdgpu_debugfs_gfxoff_read(9)
• amdgpu_debugfs_regs_init(9)

mwah 💋 — source/version ./drivers/gpu/drm/amd/amdgpu, dated October 2026, page amdgpu_debug...s_pcie_write(9). that's the cute little footer energy, bestie 🫶