312 lines
9.8 KiB
C
312 lines
9.8 KiB
C
#ifndef __DRM_GEM_H__
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#define __DRM_GEM_H__
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/*
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* GEM Graphics Execution Manager Driver Interfaces
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*
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* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* Copyright (c) 2009-2010, Code Aurora Forum.
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* All rights reserved.
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* Copyright © 2014 Intel Corporation
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* Daniel Vetter <daniel.vetter@ffwll.ch>
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*
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* Author: Rickard E. (Rik) Faith <faith@valinux.com>
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* Author: Gareth Hughes <gareth@valinux.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <linux/kref.h>
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#include <drm/drm_vma_manager.h>
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/**
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* struct drm_gem_object - GEM buffer object
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*
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* This structure defines the generic parts for GEM buffer objects, which are
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* mostly around handling mmap and userspace handles.
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*
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* Buffer objects are often abbreviated to BO.
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*/
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struct drm_gem_object {
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/**
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* @refcount:
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*
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* Reference count of this object
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*
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* Please use drm_gem_object_get() to acquire and drm_gem_object_put()
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* or drm_gem_object_put_unlocked() to release a reference to a GEM
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* buffer object.
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*/
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struct kref refcount;
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/**
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* @handle_count:
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*
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* This is the GEM file_priv handle count of this object.
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*
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* Each handle also holds a reference. Note that when the handle_count
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* drops to 0 any global names (e.g. the id in the flink namespace) will
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* be cleared.
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*
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* Protected by &drm_device.object_name_lock.
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*/
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unsigned handle_count;
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/**
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* @dev: DRM dev this object belongs to.
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*/
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struct drm_device *dev;
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/**
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* @filp:
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*
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* SHMEM file node used as backing storage for swappable buffer objects.
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* GEM also supports driver private objects with driver-specific backing
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* storage (contiguous CMA memory, special reserved blocks). In this
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* case @filp is NULL.
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*/
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struct file *filp;
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/**
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* @vma_node:
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*
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* Mapping info for this object to support mmap. Drivers are supposed to
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* allocate the mmap offset using drm_gem_create_mmap_offset(). The
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* offset itself can be retrieved using drm_vma_node_offset_addr().
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*
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* Memory mapping itself is handled by drm_gem_mmap(), which also checks
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* that userspace is allowed to access the object.
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*/
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struct drm_vma_offset_node vma_node;
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/**
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* @size:
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*
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* Size of the object, in bytes. Immutable over the object's
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* lifetime.
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*/
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size_t size;
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/**
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* @name:
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*
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* Global name for this object, starts at 1. 0 means unnamed.
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* Access is covered by &drm_device.object_name_lock. This is used by
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* the GEM_FLINK and GEM_OPEN ioctls.
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*/
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int name;
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/**
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* @read_domains:
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*
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* Read memory domains. These monitor which caches contain read/write data
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* related to the object. When transitioning from one set of domains
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* to another, the driver is called to ensure that caches are suitably
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* flushed and invalidated.
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*/
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uint32_t read_domains;
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/**
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* @write_domain: Corresponding unique write memory domain.
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*/
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uint32_t write_domain;
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/**
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* @dma_buf:
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*
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* dma-buf associated with this GEM object.
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*
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* Pointer to the dma-buf associated with this gem object (either
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* through importing or exporting). We break the resulting reference
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* loop when the last gem handle for this object is released.
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*
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* Protected by &drm_device.object_name_lock.
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*/
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struct dma_buf *dma_buf;
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/**
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* @import_attach:
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*
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* dma-buf attachment backing this object.
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*
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* Any foreign dma_buf imported as a gem object has this set to the
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* attachment point for the device. This is invariant over the lifetime
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* of a gem object.
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*
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* The &drm_driver.gem_free_object callback is responsible for cleaning
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* up the dma_buf attachment and references acquired at import time.
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*
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* Note that the drm gem/prime core does not depend upon drivers setting
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* this field any more. So for drivers where this doesn't make sense
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* (e.g. virtual devices or a displaylink behind an usb bus) they can
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* simply leave it as NULL.
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*/
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struct dma_buf_attachment *import_attach;
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};
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/**
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* DEFINE_DRM_GEM_FOPS() - macro to generate file operations for GEM drivers
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* @name: name for the generated structure
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*
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* This macro autogenerates a suitable &struct file_operations for GEM based
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* drivers, which can be assigned to &drm_driver.fops. Note that this structure
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* cannot be shared between drivers, because it contains a reference to the
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* current module using THIS_MODULE.
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*
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* Note that the declaration is already marked as static - if you need a
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* non-static version of this you're probably doing it wrong and will break the
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* THIS_MODULE reference by accident.
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*/
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#define DEFINE_DRM_GEM_FOPS(name) \
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static const struct file_operations name = {\
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.owner = THIS_MODULE,\
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.open = drm_open,\
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.release = drm_release,\
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.unlocked_ioctl = drm_ioctl,\
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.compat_ioctl = drm_compat_ioctl,\
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.poll = drm_poll,\
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.read = drm_read,\
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.llseek = noop_llseek,\
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.mmap = drm_gem_mmap,\
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}
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void drm_gem_object_release(struct drm_gem_object *obj);
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void drm_gem_object_free(struct kref *kref);
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int drm_gem_object_init(struct drm_device *dev,
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struct drm_gem_object *obj, size_t size);
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void drm_gem_private_object_init(struct drm_device *dev,
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struct drm_gem_object *obj, size_t size);
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void drm_gem_vm_open(struct vm_area_struct *vma);
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void drm_gem_vm_close(struct vm_area_struct *vma);
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int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size,
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struct vm_area_struct *vma);
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int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
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/**
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* drm_gem_object_get - acquire a GEM buffer object reference
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* @obj: GEM buffer object
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*
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* This function acquires an additional reference to @obj. It is illegal to
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* call this without already holding a reference. No locks required.
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*/
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static inline void drm_gem_object_get(struct drm_gem_object *obj)
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{
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kref_get(&obj->refcount);
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}
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/**
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* __drm_gem_object_put - raw function to release a GEM buffer object reference
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* @obj: GEM buffer object
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*
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* This function is meant to be used by drivers which are not encumbered with
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* &drm_device.struct_mutex legacy locking and which are using the
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* gem_free_object_unlocked callback. It avoids all the locking checks and
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* locking overhead of drm_gem_object_put() and drm_gem_object_put_unlocked().
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*
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* Drivers should never call this directly in their code. Instead they should
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* wrap it up into a ``driver_gem_object_put(struct driver_gem_object *obj)``
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* wrapper function, and use that. Shared code should never call this, to
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* avoid breaking drivers by accident which still depend upon
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* &drm_device.struct_mutex locking.
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*/
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static inline void
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__drm_gem_object_put(struct drm_gem_object *obj)
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{
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kref_put(&obj->refcount, drm_gem_object_free);
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}
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void drm_gem_object_put_unlocked(struct drm_gem_object *obj);
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void drm_gem_object_put(struct drm_gem_object *obj);
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/**
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* drm_gem_object_reference - acquire a GEM buffer object reference
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* @obj: GEM buffer object
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*
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* This is a compatibility alias for drm_gem_object_get() and should not be
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* used by new code.
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*/
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static inline void drm_gem_object_reference(struct drm_gem_object *obj)
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{
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drm_gem_object_get(obj);
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}
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/**
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* __drm_gem_object_unreference - raw function to release a GEM buffer object
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* reference
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* @obj: GEM buffer object
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*
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* This is a compatibility alias for __drm_gem_object_put() and should not be
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* used by new code.
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*/
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static inline void __drm_gem_object_unreference(struct drm_gem_object *obj)
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{
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__drm_gem_object_put(obj);
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}
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/**
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* drm_gem_object_unreference_unlocked - release a GEM buffer object reference
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* @obj: GEM buffer object
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*
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* This is a compatibility alias for drm_gem_object_put_unlocked() and should
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* not be used by new code.
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*/
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static inline void
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drm_gem_object_unreference_unlocked(struct drm_gem_object *obj)
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{
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drm_gem_object_put_unlocked(obj);
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}
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/**
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* drm_gem_object_unreference - release a GEM buffer object reference
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* @obj: GEM buffer object
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*
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* This is a compatibility alias for drm_gem_object_put() and should not be
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* used by new code.
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*/
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static inline void drm_gem_object_unreference(struct drm_gem_object *obj)
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{
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drm_gem_object_put(obj);
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}
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int drm_gem_handle_create(struct drm_file *file_priv,
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struct drm_gem_object *obj,
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u32 *handlep);
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int drm_gem_handle_delete(struct drm_file *filp, u32 handle);
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void drm_gem_free_mmap_offset(struct drm_gem_object *obj);
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int drm_gem_create_mmap_offset(struct drm_gem_object *obj);
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int drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size);
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struct page **drm_gem_get_pages(struct drm_gem_object *obj);
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void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages,
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bool dirty, bool accessed);
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struct drm_gem_object *drm_gem_object_lookup(struct drm_file *filp, u32 handle);
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int drm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
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u32 handle, u64 *offset);
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int drm_gem_dumb_destroy(struct drm_file *file,
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struct drm_device *dev,
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uint32_t handle);
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#endif /* __DRM_GEM_H__ */
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