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/*
* Copyright © 2014 Broadcom
*
* 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 _UAPI_VC4_DRM_H_
#define _UAPI_VC4_DRM_H_
#include <drm.h>
#define DRM_VC4_SUBMIT_CL 0x00
#define DRM_IOCTL_VC4_SUBMIT_CL DRM_IOWR( DRM_COMMAND_BASE + DRM_VC4_SUBMIT_CL, struct drm_vc4_submit_cl)
/**
* struct drm_vc4_submit_cl - ioctl argument for submitting commands to the 3D
* engine.
*
* Drivers typically use GPU BOs to store batchbuffers / command lists and
* their associated state. However, because the VC4 lacks an MMU, we have to
* do validation of memory accesses by the GPU commands. If we were to store
* our commands in BOs, we'd need to do uncached readback from them to do the
* validation process, which is too expensive. Instead, userspace accumulates
* commands and associated state in plain memory, then the kernel copies the
* data to its own address space, and then validates and stores it in a GPU
* BO.
*/
struct drm_vc4_submit_cl {
/* Pointer to the binner command list.
*
* This is the first set of commands executed, which runs the
* coordinate shader to determine where primitives land on the screen,
* then writes out the state updates and draw calls necessary per tile
* to the tile allocation BO.
*/
void __user *bin_cl;
/* Pointer to the render command list.
*
* The render command list contains a set of packets to load the
* current tile's state (reading from memory, or just clearing it)
* into the GPU, then call into the tile allocation BO to run the
* stored rendering for that tile, then store the tile's state back to
* memory.
*/
void __user *render_cl;
/* Pointer to the shader records.
*
* Shader records are the structures read by the hardware that contain
* pointers to uniforms, shaders, and vertex attributes. The
* reference to the shader record has enough information to determine
* how many pointers are necessary (fixed number for shaders/uniforms,
* and an attribute count), so those BO indices into bo_handles are
* just stored as uint32_ts before each shader record passed in.
*/
void __user *shader_rec;
/* Pointer to uniform data and texture handles for the textures
* referenced by the shader.
*
* For each shader state record, there is a set of uniform data in the
* order referenced by the record (FS, VS, then CS). Each set of
* uniform data has a uint32_t index into bo_handles per texture
* sample operation, in the order the QPU_W_TMUn_S writes appear in
* the program. Following the texture BO handle indices is the actual
* uniform data.
*
* The individual uniform state blocks don't have sizes passed in,
* because the kernel has to determine the sizes anyway during shader
* code validation.
*/
void __user *uniforms;
void __user *bo_handles;
/* Size in bytes of the binner command list. */
uint32_t bin_cl_size;
/* Size in bytes of the render command list */
uint32_t render_cl_size;
/* Size in bytes of the set of shader records. */
uint32_t shader_rec_size;
/* Number of shader records.
*
* This could just be computed from the contents of shader_records and
* the address bits of references to them from the bin CL, but it
* keeps the kernel from having to resize some allocations it makes.
*/
uint32_t shader_rec_count;
/* Size in bytes of the uniform state. */
uint32_t uniforms_size;
/* Number of BO handles passed in (size is that times 4). */
uint32_t bo_handle_count;
};
#endif /* _UAPI_VC4_DRM_H_ */
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