path: root/drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c

/**************************************************************************
 *
 * Copyright © 2015 VMware, Inc., Palo Alto, CA., USA
 * All Rights Reserved.
 *
 * 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, sub license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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
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 **************************************************************************/

#include <drm/ttm/ttm_bo_api.h>

#include "vmwgfx_drv.h"

/*
 * Size of inline command buffers. Try to make sure that a page size is a
 * multiple of the DMA pool allocation size.
 */
#define VMW_CMDBUF_INLINE_ALIGN 64
#define VMW_CMDBUF_INLINE_SIZE \
	(1024 - ALIGN(sizeof(SVGACBHeader), VMW_CMDBUF_INLINE_ALIGN))

/**
 * struct vmw_cmdbuf_context - Command buffer context queues
 *
 * @submitted: List of command buffers that have been submitted to the
 * manager but not yet submitted to hardware.
 * @hw_submitted: List of command buffers submitted to hardware.
 * @preempted: List of preempted command buffers.
 * @num_hw_submitted: Number of buffers currently being processed by hardware
 */
struct vmw_cmdbuf_context {
	struct list_head submitted;
	struct list_head hw_submitted;
	struct list_head preempted;
	unsigned num_hw_submitted;
	bool block_submission;
};

/**
 * struct vmw_cmdbuf_man: - Command buffer manager
 *
 * @cur_mutex: Mutex protecting the command buffer used for incremental small
 * kernel command submissions, @cur.
 * @space_mutex: Mutex to protect against starvation when we allocate
 * main pool buffer space.
 * @error_mutex: Mutex to serialize the work queue error handling.
 * Note this is not needed if the same workqueue handler
 * can't race with itself...
 * @work: A struct work_struct implementeing command buffer error handling.
 * Immutable.
 * @dev_priv: Pointer to the device private struct. Immutable.
 * @ctx: Array of command buffer context queues. The queues and the context
 * data is protected by @lock.
 * @error: List of command buffers that have caused device errors.
 * Protected by @lock.
 * @mm: Range manager for the command buffer space. Manager allocations and
 * frees are protected by @lock.
 * @cmd_space: Buffer object for the command buffer space, unless we were
 * able to make a contigous coherent DMA memory allocation, @handle. Immutable.
 * @map_obj: Mapping state for @cmd_space. Immutable.
 * @map: Pointer to command buffer space. May be a mapped buffer object or
 * a contigous coherent DMA memory allocation. Immutable.
 * @cur: Command buffer for small kernel command submissions. Protected by
 * the @cur_mutex.
 * @cur_pos: Space already used in @cur. Protected by @cur_mutex.
 * @default_size: Default size for the @cur command buffer. Immutable.
 * @max_hw_submitted: Max number of in-flight command buffers the device can
 * handle. Immutable.
 * @lock: Spinlock protecting command submission queues.
 * @header: Pool of DMA memory for device command buffer headers.
 * Internal protection.
 * @dheaders: Pool of DMA memory for device command buffer headers with trailing
 * space for inline data. Internal protection.
 * @alloc_queue: Wait queue for processes waiting to allocate command buffer
 * space.
 * @idle_queue: Wait queue for processes waiting for command buffer idle