amdgpu_debu...gs_smc_write(9)

okay so bestie, this is amdgpu_debu...gs_smc_write(9) from the Kernel API Manual, and it is literally the function that writes to a SMC register. No cap, here’s the whole signature:

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

💖 NAME

amdgpu_debugfs_regs_smc_write — write to a SMC register. That’s the whole assignment, and she ate. 💅

✨ SYNOPSIS

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

🎀 ARGUMENTS

• f — open file handle
• buf — user buffer to write data from
• size — number of bytes to write
• pos — offset to seek to

🌸 DESCRIPTION

The lower bits are the BYTE offset of the register to write. This allows writing multiple registers in a single call, and having the returned size reflect that. So iconic — multiple registers, one call, and the returned size is right there matching the vibe. ✨

💅 SEE ALSO

• 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_pcie_write(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_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: ./drivers/gpu/drm/amd/amdgpu · date: October 2026 · page: amdgpu_debu...gs_smc_write(9) 🫶