From f8a58d639dd95b0188862b4c1c1cc81c737db612 Mon Sep 17 00:00:00 2001 From: Michal Wajdeczko Date: Fri, 26 May 2017 11:13:25 +0000 Subject: drm/i915/guc: Introduce buffer based cmd transport Buffer based command transport can replace MMIO based mechanism. It may be used to perform host-2-guc and guc-to-host communication. Portions of this patch are based on work by: Michel Thierry Robert Beckett Daniele Ceraolo Spurio v2: use gem_object_pin_map (Chris) don't use DEBUG_RATELIMITED (Chris) don't track action stats (Chris) simplify next fence (Chris) use READ_ONCE (Chris) move blob allocation to new function (Chris) v3: use static owner id (Daniele) v4: but keep channel initialization generic (Daniele) and introduce owner_sub_id (Daniele) Signed-off-by: Michal Wajdeczko Cc: Daniele Ceraolo Spurio Cc: Oscar Mateo Cc: Joonas Lahtinen Cc: Chris Wilson Reviewed-by: Daniele Ceraolo Spurio Signed-off-by: Chris Wilson Link: http://patchwork.freedesktop.org/patch/msgid/20170526111326.87280-3-michal.wajdeczko@intel.com --- drivers/gpu/drm/i915/intel_guc_ct.h | 86 +++++++++++++++++++++++++++++++++++++ 1 file changed, 86 insertions(+) create mode 100644 drivers/gpu/drm/i915/intel_guc_ct.h (limited to 'drivers/gpu/drm/i915/intel_guc_ct.h') diff --git a/drivers/gpu/drm/i915/intel_guc_ct.h b/drivers/gpu/drm/i915/intel_guc_ct.h new file mode 100644 index 000000000000..6d97f36fcc62 --- /dev/null +++ b/drivers/gpu/drm/i915/intel_guc_ct.h @@ -0,0 +1,86 @@ +/* + * Copyright © 2016-2017 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + */ + +#ifndef _INTEL_GUC_CT_H_ +#define _INTEL_GUC_CT_H_ + +struct intel_guc; +struct i915_vma; + +#include "intel_guc_fwif.h" + +/** + * DOC: Command Transport (CT). + * + * Buffer based command transport is a replacement for MMIO based mechanism. + * It can be used to perform both host-2-guc and guc-to-host communication. + */ + +/** Represents single command transport buffer. + * + * A single command transport buffer consists of two parts, the header + * record (command transport buffer descriptor) and the actual buffer which + * holds the commands. + * + * @desc: pointer to the buffer descriptor + * @cmds: pointer to the commands buffer + */ +struct intel_guc_ct_buffer { + struct guc_ct_buffer_desc *desc; + u32 *cmds; +}; + +/** Represents pair of command transport buffers. + * + * Buffers go in pairs to allow bi-directional communication. + * To simplify the code we place both of them in the same vma. + * Buffers from the same pair must share unique owner id. + * + * @vma: pointer to the vma with pair of CT buffers + * @ctbs: buffers for sending(0) and receiving(1) commands + * @owner: unique identifier + * @next_fence: fence to be used with next send command + */ +struct intel_guc_ct_channel { + struct i915_vma *vma; + struct intel_guc_ct_buffer ctbs[2]; + u32 owner; + u32 next_fence; +}; + +/** Holds all command transport channels. + * + * @host_channel: main channel used by the host + */ +struct intel_guc_ct { + struct intel_guc_ct_channel host_channel; + /* other channels are tbd */ +}; + +void intel_guc_ct_init_early(struct intel_guc_ct *ct); + +/* XXX: move to intel_uc.h ? don't fit there either */ +int intel_guc_enable_ct(struct intel_guc *guc); +void intel_guc_disable_ct(struct intel_guc *guc); + +#endif /* _INTEL_GUC_CT_H_ */ -- cgit v1.2.3