dist/intel/intel_bufmgr_priv.h

/*
 * Copyright © 2008 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.
 *
 * Authors:
 *    Eric Anholt <eric@anholt.net>
 *
 */

/**
 * @file intel_bufmgr_priv.h
 *
 * Private definitions of Intel-specific bufmgr functions and structures.
 */

#ifndef INTEL_BUFMGR_PRIV_H
#define INTEL_BUFMGR_PRIV_H

/**
 * Context for a buffer manager instance.
 *
 * Contains public methods followed by private storage for the buffer manager.
 */
struct _drm_intel_bufmgr {
	/**
	 * Allocate a buffer object.
	 *
	 * Buffer objects are not necessarily initially mapped into CPU virtual
	 * address space or graphics device aperture.  They must be mapped
	 * using bo_map() or drm_intel_gem_bo_map_gtt() to be used by the CPU.
	 */
	drm_intel_bo *(*bo_alloc) (drm_intel_bufmgr *bufmgr, const char *name,
				   unsigned long size, unsigned int alignment);

	/**
	 * Allocate a buffer object, hinting that it will be used as a
	 * render target.
	 *
	 * This is otherwise the same as bo_alloc.
	 */
	drm_intel_bo *(*bo_alloc_for_render) (drm_intel_bufmgr *bufmgr,
					      const char *name,
					      unsigned long size,
					      unsigned int alignment);

	/**
	 * Allocate a tiled buffer object.
	 *
	 * Alignment for tiled objects is set automatically; the 'flags'
	 * argument provides a hint about how the object will be used initially.
	 *
	 * Valid tiling formats are:
	 *  I915_TILING_NONE
	 *  I915_TILING_X
	 *  I915_TILING_Y
	 *
	 * Note the tiling format may be rejected; callers should check the
	 * 'tiling_mode' field on return, as well as the pitch value, which
	 * may have been rounded up to accommodate for tiling restrictions.
	 */
	drm_intel_bo *(*bo_alloc_tiled) (drm_intel_bufmgr *bufmgr,
					 const char *name,
					 int x, int y, int cpp,
					 uint32_t *tiling_mode,
					 unsigned long *pitch,
					 unsigned long flags);

	/** Takes a reference on a buffer object */
	void (*bo_reference) (drm_intel_bo *bo);

	/**
	 * Releases a reference on a buffer object, freeing the data if
	 * no references remain.
	 */
	void (*bo_unreference) (drm_intel_bo *bo);

	/**
	 * Maps the buffer into userspace.
	 *
	 * This function will block waiting for any existing execution on the
	 * buffer to complete, first.  The resulting mapping is available at
	 * buf->virtual.
	 */
	int (*bo_map) (drm_intel_bo *bo, int write_enable);

	/**
	 * Reduces the refcount on the userspace mapping of the buffer
	 * object.
	 */
	int (*bo_unmap) (drm_intel_bo *bo);

	/**
	 * Write data into an object.
	 *
	 * This is an optional function, if missing,
	 * drm_intel_bo will map/memcpy/unmap.
	 */
	int (*bo_subdata) (drm_intel_bo *bo, unsigned long offset,
			   unsigned long size, const void *data);

	/**
	 * Read data from an object
	 *
	 * This is an optional function, if missing,
	 * drm_intel_bo will map/memcpy/unmap.
	 */
	int (*bo_get_subdata) (drm_intel_bo *bo, unsigned long offset,
			       unsigned long size, void *data);

	/**
	 * Waits for rendering to an object by the GPU to have completed.
	 *
	 * This is not required for any access to the BO by bo_map,
	 * bo_subdata, etc.  It is merely a way for the driver to implement
	 * glFinish.
	 */
	void (*bo_wait_rendering) (drm_intel_bo *bo);

	/**
	 * Tears down the buffer manager instance.
	 */
	void (*destroy) (drm_intel_bufmgr *bufmgr);

	/**
	 * Add relocation entry in reloc_buf, which will be updated with the
	 * target buffer's real offset on on command submission.
	 *
	 * Relocations remain in place for the lifetime of the buffer object.
	 *
	 * \param bo Buffer to write the relocation into.
	 * \param offset Byte offset within reloc_bo of the pointer to
	 *			target_bo.
	 * \param target_bo Buffer whose offset should be written into the
	 *                  relocation entry.
	 * \param target_offset Constant value to be added to target_bo's
	 *			offset in relocation entry.
	 * \param read_domains GEM read domains which the buffer will be
	 *			read into by the command that this relocation
	 *			is part of.
	 * \param write_domains GEM read domains which the buffer will be
	 *			dirtied in by the command that this
	 *			relocation is part of.
	 */
	int (*bo_emit_reloc) (drm_intel_bo *bo, uint32_t offset,
			      drm_intel_bo *target_bo, uint32_t target_offset,
			      uint32_t read_domains, uint32_t write_domain);
	int (*bo_emit_reloc_fence)(drm_intel_bo *bo, uint32_t offset,
				   drm_intel_bo *target_bo,
				   uint32_t target_offset,
				   uint32_t read_domains,
				   uint32_t write_domain);

	/** Executes the command buffer pointed to by bo. */
	int (*bo_exec) (drm_intel_bo *bo, int used,
			drm_clip_rect_t *cliprects, int num_cliprects,
			int DR4);

	/**
	 * Pin a buffer to the aperture and fix the offset until unpinned
	 *
	 * \param buf Buffer to pin
	 * \param alignment Required alignment for aperture, in bytes
	 */
	int (*bo_pin) (drm_intel_bo *bo, uint32_t alignment);

	/**
	 * Unpin a buffer from the aperture, allowing it to be removed
	 *
	 * \param buf Buffer to unpin
	 */
	int (*bo_unpin) (drm_intel_bo *bo);

	/**
	 * Ask that the buffer be placed in tiling mode
	 *
	 * \param buf Buffer to set tiling mode for
	 * \param tiling_mode desired, and returned tiling mode
	 */
	int (*bo_set_tiling) (drm_intel_bo *bo, uint32_t * tiling_mode,
			      uint32_t stride);

	/**
	 * Get the current tiling (and resulting swizzling) mode for the bo.
	 *
	 * \param buf Buffer to get tiling mode for
	 * \param tiling_mode returned tiling mode
	 * \param swizzle_mode returned swizzling mode
	 */
	int (*bo_get_tiling) (drm_intel_bo *bo, uint32_t * tiling_mode,
			      uint32_t * swizzle_mode);

	/**
	 * Create a visible name for a buffer which can be used by other apps
	 *
	 * \param buf Buffer to create a name for
	 * \param name Returned name
	 */
	int (*bo_flink) (drm_intel_bo *bo, uint32_t * name);

	/**
	 * Returns 1 if mapping the buffer for write could cause the process
	 * to block, due to the object being active in the GPU.
	 */
	int (*bo_busy) (drm_intel_bo *bo);

	/**
	 * Specify the volatility of the buffer.
	 * \param bo Buffer to create a name for
	 * \param madv The purgeable status
	 *
	 * Use I915_MADV_DONTNEED to mark the buffer as purgeable, and it will be
	 * reclaimed under memory pressure. If you subsequently require the buffer,
	 * then you must pass I915_MADV_WILLNEED to mark the buffer as required.
	 *
	 * Returns 1 if the buffer was retained, or 0 if it was discarded whilst
	 * marked as I915_MADV_DONTNEED.
	 */
	int (*bo_madvise) (drm_intel_bo *bo, int madv);

	int (*check_aperture_space) (drm_intel_bo ** bo_array, int count);

	/**
	 * Disable buffer reuse for buffers which will be shared in some way,
	 * as with scanout buffers. When the buffer reference count goes to
	 * zero, it will be freed and not placed in the reuse list.
	 *
	 * \param bo Buffer to disable reuse for
	 */
	int (*bo_disable_reuse) (drm_intel_bo *bo);

	/**
	 *
	 * Return the pipe associated with a crtc_id so that vblank
	 * synchronization can use the correct data in the request.
	 * This is only supported for KMS and gem at this point, when
	 * unsupported, this function returns -1 and leaves the decision
	 * of what to do in that case to the caller
	 *
	 * \param bufmgr the associated buffer manager
	 * \param crtc_id the crtc identifier
	 */
	int (*get_pipe_from_crtc_id) (drm_intel_bufmgr *bufmgr, int crtc_id);

	/** Returns true if target_bo is in the relocation tree rooted at bo. */
	int (*bo_references) (drm_intel_bo *bo, drm_intel_bo *target_bo);

	/**< Enables verbose debugging printouts */
	int debug;
};

#define ALIGN(value, alignment)	((value + alignment - 1) & ~(alignment - 1))
#define ROUND_UP_TO(x, y)	(((x) + (y) - 1) / (y) * (y))
#define ROUND_UP_TO_MB(x)	ROUND_UP_TO((x), 1024*1024)

#endif /* INTEL_BUFMGR_PRIV_H */