From 613ecd6563d2716192e69624105fe1939d104663 Mon Sep 17 00:00:00 2001 From: André Almeida Date: Fri, 10 Nov 2023 12:23:28 -0500 Subject: drm/amd: Document device reset methods MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Document what each amdgpu driver reset method does. Signed-off-by: André Almeida Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu.h | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu.h') diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h index 4d100f8d75bf..ea2656bd714f 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h @@ -508,6 +508,31 @@ struct amdgpu_allowed_register_entry { bool grbm_indexed; }; +/** + * enum amd_reset_method - Methods for resetting AMD GPU devices + * + * @AMD_RESET_METHOD_NONE: The device will not be reset. + * @AMD_RESET_LEGACY: Method reserved for SI, CIK and VI ASICs. + * @AMD_RESET_MODE0: Reset the entire ASIC. Not currently available for the + * any device. + * @AMD_RESET_MODE1: Resets all IP blocks on the ASIC (SDMA, GFX, VCN, etc.) + * individually. Suitable only for some discrete GPU, not + * available for all ASICs. + * @AMD_RESET_MODE2: Resets a lesser level of IPs compared to MODE1. Which IPs + * are reset depends on the ASIC. Notably doesn't reset IPs + * shared with the CPU on APUs or the memory controllers (so + * VRAM is not lost). Not available on all ASICs. + * @AMD_RESET_BACO: BACO (Bus Alive, Chip Off) method powers off and on the card + * but without powering off the PCI bus. Suitable only for + * discrete GPUs. + * @AMD_RESET_PCI: Does a full bus reset using core Linux subsystem PCI reset + * and does a secondary bus reset or FLR, depending on what the + * underlying hardware supports. + * + * Methods available for AMD GPU driver for resetting the device. Not all + * methods are suitable for every device. User can override the method using + * module parameter `reset_method`. + */ enum amd_reset_method { AMD_RESET_METHOD_NONE = -1, AMD_RESET_METHOD_LEGACY = 0, -- cgit