![David Herrmann](/assets/img/avatar_default.png)
All drivers embed gem-objects into their own buffer objects. There is no reason to keep drm_gem_object_alloc(), gem->driver_private and ->gem_init_object() anymore. New drivers are highly encouraged to do the same. There is no benefit in allocating gem-objects separately. Cc: Dave Airlie <airlied@gmail.com> Cc: Alex Deucher <alexdeucher@gmail.com> Cc: Daniel Vetter <daniel@ffwll.ch> Cc: Jerome Glisse <jglisse@redhat.com> Cc: Rob Clark <robdclark@gmail.com> Cc: Inki Dae <inki.dae@samsung.com> Cc: Ben Skeggs <skeggsb@gmail.com> Cc: Patrik Jakobsson <patrik.r.jakobsson@gmail.com> Signed-off-by: David Herrmann <dh.herrmann@gmail.com> Acked-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
864 lines
24 KiB
C
864 lines
24 KiB
C
/*
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* Copyright © 2008 Intel Corporation
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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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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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* Authors:
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* Eric Anholt <eric@anholt.net>
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*
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*/
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/mm.h>
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#include <linux/uaccess.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/module.h>
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#include <linux/mman.h>
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#include <linux/pagemap.h>
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#include <linux/shmem_fs.h>
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#include <linux/dma-buf.h>
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#include <drm/drmP.h>
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#include <drm/drm_vma_manager.h>
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/** @file drm_gem.c
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*
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* This file provides some of the base ioctls and library routines for
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* the graphics memory manager implemented by each device driver.
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*
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* Because various devices have different requirements in terms of
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* synchronization and migration strategies, implementing that is left up to
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* the driver, and all that the general API provides should be generic --
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* allocating objects, reading/writing data with the cpu, freeing objects.
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* Even there, platform-dependent optimizations for reading/writing data with
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* the CPU mean we'll likely hook those out to driver-specific calls. However,
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* the DRI2 implementation wants to have at least allocate/mmap be generic.
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*
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* The goal was to have swap-backed object allocation managed through
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* struct file. However, file descriptors as handles to a struct file have
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* two major failings:
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* - Process limits prevent more than 1024 or so being used at a time by
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* default.
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* - Inability to allocate high fds will aggravate the X Server's select()
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* handling, and likely that of many GL client applications as well.
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*
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* This led to a plan of using our own integer IDs (called handles, following
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* DRM terminology) to mimic fds, and implement the fd syscalls we need as
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* ioctls. The objects themselves will still include the struct file so
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* that we can transition to fds if the required kernel infrastructure shows
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* up at a later date, and as our interface with shmfs for memory allocation.
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*/
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/*
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* We make up offsets for buffer objects so we can recognize them at
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* mmap time.
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*/
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/* pgoff in mmap is an unsigned long, so we need to make sure that
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* the faked up offset will fit
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*/
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#if BITS_PER_LONG == 64
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#define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFFUL >> PAGE_SHIFT) + 1)
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#define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFFUL >> PAGE_SHIFT) * 16)
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#else
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#define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFUL >> PAGE_SHIFT) + 1)
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#define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFUL >> PAGE_SHIFT) * 16)
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#endif
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/**
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* Initialize the GEM device fields
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*/
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int
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drm_gem_init(struct drm_device *dev)
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{
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struct drm_gem_mm *mm;
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mutex_init(&dev->object_name_lock);
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idr_init(&dev->object_name_idr);
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mm = kzalloc(sizeof(struct drm_gem_mm), GFP_KERNEL);
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if (!mm) {
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DRM_ERROR("out of memory\n");
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return -ENOMEM;
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}
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dev->mm_private = mm;
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drm_vma_offset_manager_init(&mm->vma_manager,
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DRM_FILE_PAGE_OFFSET_START,
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DRM_FILE_PAGE_OFFSET_SIZE);
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return 0;
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}
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void
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drm_gem_destroy(struct drm_device *dev)
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{
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struct drm_gem_mm *mm = dev->mm_private;
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drm_vma_offset_manager_destroy(&mm->vma_manager);
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kfree(mm);
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dev->mm_private = NULL;
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}
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/**
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* Initialize an already allocated GEM object of the specified size with
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* shmfs backing store.
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*/
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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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{
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struct file *filp;
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filp = shmem_file_setup("drm mm object", size, VM_NORESERVE);
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if (IS_ERR(filp))
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return PTR_ERR(filp);
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drm_gem_private_object_init(dev, obj, size);
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obj->filp = filp;
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return 0;
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}
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EXPORT_SYMBOL(drm_gem_object_init);
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/**
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* Initialize an already allocated GEM object of the specified size with
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* no GEM provided backing store. Instead the caller is responsible for
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* backing the object and handling it.
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*/
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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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{
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BUG_ON((size & (PAGE_SIZE - 1)) != 0);
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obj->dev = dev;
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obj->filp = NULL;
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kref_init(&obj->refcount);
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obj->handle_count = 0;
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obj->size = size;
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drm_vma_node_reset(&obj->vma_node);
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}
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EXPORT_SYMBOL(drm_gem_private_object_init);
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static void
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drm_gem_remove_prime_handles(struct drm_gem_object *obj, struct drm_file *filp)
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{
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/*
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* Note: obj->dma_buf can't disappear as long as we still hold a
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* handle reference in obj->handle_count.
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*/
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mutex_lock(&filp->prime.lock);
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if (obj->dma_buf) {
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drm_prime_remove_buf_handle_locked(&filp->prime,
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obj->dma_buf);
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}
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mutex_unlock(&filp->prime.lock);
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}
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static void drm_gem_object_ref_bug(struct kref *list_kref)
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{
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BUG();
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}
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/**
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* Called after the last handle to the object has been closed
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*
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* Removes any name for the object. Note that this must be
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* called before drm_gem_object_free or we'll be touching
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* freed memory
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*/
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static void drm_gem_object_handle_free(struct drm_gem_object *obj)
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{
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struct drm_device *dev = obj->dev;
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/* Remove any name for this object */
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if (obj->name) {
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idr_remove(&dev->object_name_idr, obj->name);
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obj->name = 0;
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/*
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* The object name held a reference to this object, drop
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* that now.
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*
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* This cannot be the last reference, since the handle holds one too.
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*/
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kref_put(&obj->refcount, drm_gem_object_ref_bug);
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}
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}
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static void drm_gem_object_exported_dma_buf_free(struct drm_gem_object *obj)
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{
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/* Unbreak the reference cycle if we have an exported dma_buf. */
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if (obj->dma_buf) {
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dma_buf_put(obj->dma_buf);
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obj->dma_buf = NULL;
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}
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}
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static void
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drm_gem_object_handle_unreference_unlocked(struct drm_gem_object *obj)
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{
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if (WARN_ON(obj->handle_count == 0))
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return;
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/*
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* Must bump handle count first as this may be the last
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* ref, in which case the object would disappear before we
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* checked for a name
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*/
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mutex_lock(&obj->dev->object_name_lock);
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if (--obj->handle_count == 0) {
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drm_gem_object_handle_free(obj);
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drm_gem_object_exported_dma_buf_free(obj);
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}
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mutex_unlock(&obj->dev->object_name_lock);
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drm_gem_object_unreference_unlocked(obj);
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}
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/**
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* Removes the mapping from handle to filp for this object.
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*/
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int
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drm_gem_handle_delete(struct drm_file *filp, u32 handle)
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{
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struct drm_device *dev;
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struct drm_gem_object *obj;
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/* This is gross. The idr system doesn't let us try a delete and
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* return an error code. It just spews if you fail at deleting.
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* So, we have to grab a lock around finding the object and then
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* doing the delete on it and dropping the refcount, or the user
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* could race us to double-decrement the refcount and cause a
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* use-after-free later. Given the frequency of our handle lookups,
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* we may want to use ida for number allocation and a hash table
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* for the pointers, anyway.
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*/
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spin_lock(&filp->table_lock);
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/* Check if we currently have a reference on the object */
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obj = idr_find(&filp->object_idr, handle);
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if (obj == NULL) {
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spin_unlock(&filp->table_lock);
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return -EINVAL;
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}
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dev = obj->dev;
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/* Release reference and decrement refcount. */
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idr_remove(&filp->object_idr, handle);
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spin_unlock(&filp->table_lock);
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if (drm_core_check_feature(dev, DRIVER_PRIME))
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drm_gem_remove_prime_handles(obj, filp);
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drm_vma_node_revoke(&obj->vma_node, filp->filp);
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if (dev->driver->gem_close_object)
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dev->driver->gem_close_object(obj, filp);
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drm_gem_object_handle_unreference_unlocked(obj);
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return 0;
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}
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EXPORT_SYMBOL(drm_gem_handle_delete);
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/**
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* drm_gem_dumb_destroy - dumb fb callback helper for gem based drivers
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*
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* This implements the ->dumb_destroy kms driver callback for drivers which use
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* gem to manage their backing storage.
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*/
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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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{
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return drm_gem_handle_delete(file, handle);
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}
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EXPORT_SYMBOL(drm_gem_dumb_destroy);
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/**
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* drm_gem_handle_create_tail - internal functions to create a handle
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*
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* This expects the dev->object_name_lock to be held already and will drop it
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* before returning. Used to avoid races in establishing new handles when
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* importing an object from either an flink name or a dma-buf.
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*/
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int
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drm_gem_handle_create_tail(struct drm_file *file_priv,
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struct drm_gem_object *obj,
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u32 *handlep)
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{
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struct drm_device *dev = obj->dev;
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int ret;
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WARN_ON(!mutex_is_locked(&dev->object_name_lock));
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/*
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* Get the user-visible handle using idr. Preload and perform
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* allocation under our spinlock.
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*/
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idr_preload(GFP_KERNEL);
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spin_lock(&file_priv->table_lock);
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ret = idr_alloc(&file_priv->object_idr, obj, 1, 0, GFP_NOWAIT);
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drm_gem_object_reference(obj);
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obj->handle_count++;
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spin_unlock(&file_priv->table_lock);
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idr_preload_end();
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mutex_unlock(&dev->object_name_lock);
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if (ret < 0) {
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drm_gem_object_handle_unreference_unlocked(obj);
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return ret;
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}
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*handlep = ret;
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ret = drm_vma_node_allow(&obj->vma_node, file_priv->filp);
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if (ret) {
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drm_gem_handle_delete(file_priv, *handlep);
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return ret;
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}
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if (dev->driver->gem_open_object) {
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ret = dev->driver->gem_open_object(obj, file_priv);
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if (ret) {
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drm_gem_handle_delete(file_priv, *handlep);
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return ret;
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}
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}
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return 0;
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}
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/**
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* Create a handle for this object. This adds a handle reference
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* to the object, which includes a regular reference count. Callers
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* will likely want to dereference the object afterwards.
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*/
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int
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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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{
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mutex_lock(&obj->dev->object_name_lock);
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return drm_gem_handle_create_tail(file_priv, obj, handlep);
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}
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EXPORT_SYMBOL(drm_gem_handle_create);
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/**
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* drm_gem_free_mmap_offset - release a fake mmap offset for an object
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* @obj: obj in question
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*
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* This routine frees fake offsets allocated by drm_gem_create_mmap_offset().
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*/
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void
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drm_gem_free_mmap_offset(struct drm_gem_object *obj)
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{
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struct drm_device *dev = obj->dev;
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struct drm_gem_mm *mm = dev->mm_private;
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drm_vma_offset_remove(&mm->vma_manager, &obj->vma_node);
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}
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EXPORT_SYMBOL(drm_gem_free_mmap_offset);
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/**
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* drm_gem_create_mmap_offset_size - create a fake mmap offset for an object
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* @obj: obj in question
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* @size: the virtual size
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*
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* GEM memory mapping works by handing back to userspace a fake mmap offset
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* it can use in a subsequent mmap(2) call. The DRM core code then looks
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* up the object based on the offset and sets up the various memory mapping
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* structures.
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*
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* This routine allocates and attaches a fake offset for @obj, in cases where
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* the virtual size differs from the physical size (ie. obj->size). Otherwise
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* just use drm_gem_create_mmap_offset().
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*/
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int
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drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size)
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{
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struct drm_device *dev = obj->dev;
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struct drm_gem_mm *mm = dev->mm_private;
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return drm_vma_offset_add(&mm->vma_manager, &obj->vma_node,
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size / PAGE_SIZE);
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}
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EXPORT_SYMBOL(drm_gem_create_mmap_offset_size);
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/**
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* drm_gem_create_mmap_offset - create a fake mmap offset for an object
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* @obj: obj in question
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*
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* GEM memory mapping works by handing back to userspace a fake mmap offset
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* it can use in a subsequent mmap(2) call. The DRM core code then looks
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* up the object based on the offset and sets up the various memory mapping
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* structures.
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*
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* This routine allocates and attaches a fake offset for @obj.
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*/
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int drm_gem_create_mmap_offset(struct drm_gem_object *obj)
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{
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return drm_gem_create_mmap_offset_size(obj, obj->size);
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}
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EXPORT_SYMBOL(drm_gem_create_mmap_offset);
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/**
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* drm_gem_get_pages - helper to allocate backing pages for a GEM object
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* from shmem
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* @obj: obj in question
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* @gfpmask: gfp mask of requested pages
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*/
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struct page **drm_gem_get_pages(struct drm_gem_object *obj, gfp_t gfpmask)
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{
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struct inode *inode;
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struct address_space *mapping;
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struct page *p, **pages;
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int i, npages;
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/* This is the shared memory object that backs the GEM resource */
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inode = file_inode(obj->filp);
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mapping = inode->i_mapping;
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/* We already BUG_ON() for non-page-aligned sizes in
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* drm_gem_object_init(), so we should never hit this unless
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* driver author is doing something really wrong:
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*/
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WARN_ON((obj->size & (PAGE_SIZE - 1)) != 0);
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npages = obj->size >> PAGE_SHIFT;
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pages = drm_malloc_ab(npages, sizeof(struct page *));
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if (pages == NULL)
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return ERR_PTR(-ENOMEM);
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gfpmask |= mapping_gfp_mask(mapping);
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for (i = 0; i < npages; i++) {
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p = shmem_read_mapping_page_gfp(mapping, i, gfpmask);
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if (IS_ERR(p))
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goto fail;
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pages[i] = p;
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/* There is a hypothetical issue w/ drivers that require
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* buffer memory in the low 4GB.. if the pages are un-
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* pinned, and swapped out, they can end up swapped back
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* in above 4GB. If pages are already in memory, then
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* shmem_read_mapping_page_gfp will ignore the gfpmask,
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* even if the already in-memory page disobeys the mask.
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*
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* It is only a theoretical issue today, because none of
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* the devices with this limitation can be populated with
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* enough memory to trigger the issue. But this BUG_ON()
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* is here as a reminder in case the problem with
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* shmem_read_mapping_page_gfp() isn't solved by the time
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* it does become a real issue.
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*
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* See this thread: http://lkml.org/lkml/2011/7/11/238
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*/
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BUG_ON((gfpmask & __GFP_DMA32) &&
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(page_to_pfn(p) >= 0x00100000UL));
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}
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return pages;
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fail:
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while (i--)
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page_cache_release(pages[i]);
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drm_free_large(pages);
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return ERR_CAST(p);
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}
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EXPORT_SYMBOL(drm_gem_get_pages);
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/**
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* drm_gem_put_pages - helper to free backing pages for a GEM object
|
|
* @obj: obj in question
|
|
* @pages: pages to free
|
|
* @dirty: if true, pages will be marked as dirty
|
|
* @accessed: if true, the pages will be marked as accessed
|
|
*/
|
|
void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages,
|
|
bool dirty, bool accessed)
|
|
{
|
|
int i, npages;
|
|
|
|
/* We already BUG_ON() for non-page-aligned sizes in
|
|
* drm_gem_object_init(), so we should never hit this unless
|
|
* driver author is doing something really wrong:
|
|
*/
|
|
WARN_ON((obj->size & (PAGE_SIZE - 1)) != 0);
|
|
|
|
npages = obj->size >> PAGE_SHIFT;
|
|
|
|
for (i = 0; i < npages; i++) {
|
|
if (dirty)
|
|
set_page_dirty(pages[i]);
|
|
|
|
if (accessed)
|
|
mark_page_accessed(pages[i]);
|
|
|
|
/* Undo the reference we took when populating the table */
|
|
page_cache_release(pages[i]);
|
|
}
|
|
|
|
drm_free_large(pages);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_put_pages);
|
|
|
|
/** Returns a reference to the object named by the handle. */
|
|
struct drm_gem_object *
|
|
drm_gem_object_lookup(struct drm_device *dev, struct drm_file *filp,
|
|
u32 handle)
|
|
{
|
|
struct drm_gem_object *obj;
|
|
|
|
spin_lock(&filp->table_lock);
|
|
|
|
/* Check if we currently have a reference on the object */
|
|
obj = idr_find(&filp->object_idr, handle);
|
|
if (obj == NULL) {
|
|
spin_unlock(&filp->table_lock);
|
|
return NULL;
|
|
}
|
|
|
|
drm_gem_object_reference(obj);
|
|
|
|
spin_unlock(&filp->table_lock);
|
|
|
|
return obj;
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_object_lookup);
|
|
|
|
/**
|
|
* Releases the handle to an mm object.
|
|
*/
|
|
int
|
|
drm_gem_close_ioctl(struct drm_device *dev, void *data,
|
|
struct drm_file *file_priv)
|
|
{
|
|
struct drm_gem_close *args = data;
|
|
int ret;
|
|
|
|
if (!(dev->driver->driver_features & DRIVER_GEM))
|
|
return -ENODEV;
|
|
|
|
ret = drm_gem_handle_delete(file_priv, args->handle);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* Create a global name for an object, returning the name.
|
|
*
|
|
* Note that the name does not hold a reference; when the object
|
|
* is freed, the name goes away.
|
|
*/
|
|
int
|
|
drm_gem_flink_ioctl(struct drm_device *dev, void *data,
|
|
struct drm_file *file_priv)
|
|
{
|
|
struct drm_gem_flink *args = data;
|
|
struct drm_gem_object *obj;
|
|
int ret;
|
|
|
|
if (!(dev->driver->driver_features & DRIVER_GEM))
|
|
return -ENODEV;
|
|
|
|
obj = drm_gem_object_lookup(dev, file_priv, args->handle);
|
|
if (obj == NULL)
|
|
return -ENOENT;
|
|
|
|
mutex_lock(&dev->object_name_lock);
|
|
idr_preload(GFP_KERNEL);
|
|
/* prevent races with concurrent gem_close. */
|
|
if (obj->handle_count == 0) {
|
|
ret = -ENOENT;
|
|
goto err;
|
|
}
|
|
|
|
if (!obj->name) {
|
|
ret = idr_alloc(&dev->object_name_idr, obj, 1, 0, GFP_NOWAIT);
|
|
if (ret < 0)
|
|
goto err;
|
|
|
|
obj->name = ret;
|
|
|
|
/* Allocate a reference for the name table. */
|
|
drm_gem_object_reference(obj);
|
|
}
|
|
|
|
args->name = (uint64_t) obj->name;
|
|
ret = 0;
|
|
|
|
err:
|
|
idr_preload_end();
|
|
mutex_unlock(&dev->object_name_lock);
|
|
drm_gem_object_unreference_unlocked(obj);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* Open an object using the global name, returning a handle and the size.
|
|
*
|
|
* This handle (of course) holds a reference to the object, so the object
|
|
* will not go away until the handle is deleted.
|
|
*/
|
|
int
|
|
drm_gem_open_ioctl(struct drm_device *dev, void *data,
|
|
struct drm_file *file_priv)
|
|
{
|
|
struct drm_gem_open *args = data;
|
|
struct drm_gem_object *obj;
|
|
int ret;
|
|
u32 handle;
|
|
|
|
if (!(dev->driver->driver_features & DRIVER_GEM))
|
|
return -ENODEV;
|
|
|
|
mutex_lock(&dev->object_name_lock);
|
|
obj = idr_find(&dev->object_name_idr, (int) args->name);
|
|
if (obj) {
|
|
drm_gem_object_reference(obj);
|
|
} else {
|
|
mutex_unlock(&dev->object_name_lock);
|
|
return -ENOENT;
|
|
}
|
|
|
|
/* drm_gem_handle_create_tail unlocks dev->object_name_lock. */
|
|
ret = drm_gem_handle_create_tail(file_priv, obj, &handle);
|
|
drm_gem_object_unreference_unlocked(obj);
|
|
if (ret)
|
|
return ret;
|
|
|
|
args->handle = handle;
|
|
args->size = obj->size;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Called at device open time, sets up the structure for handling refcounting
|
|
* of mm objects.
|
|
*/
|
|
void
|
|
drm_gem_open(struct drm_device *dev, struct drm_file *file_private)
|
|
{
|
|
idr_init(&file_private->object_idr);
|
|
spin_lock_init(&file_private->table_lock);
|
|
}
|
|
|
|
/**
|
|
* Called at device close to release the file's
|
|
* handle references on objects.
|
|
*/
|
|
static int
|
|
drm_gem_object_release_handle(int id, void *ptr, void *data)
|
|
{
|
|
struct drm_file *file_priv = data;
|
|
struct drm_gem_object *obj = ptr;
|
|
struct drm_device *dev = obj->dev;
|
|
|
|
if (drm_core_check_feature(dev, DRIVER_PRIME))
|
|
drm_gem_remove_prime_handles(obj, file_priv);
|
|
drm_vma_node_revoke(&obj->vma_node, file_priv->filp);
|
|
|
|
if (dev->driver->gem_close_object)
|
|
dev->driver->gem_close_object(obj, file_priv);
|
|
|
|
drm_gem_object_handle_unreference_unlocked(obj);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Called at close time when the filp is going away.
|
|
*
|
|
* Releases any remaining references on objects by this filp.
|
|
*/
|
|
void
|
|
drm_gem_release(struct drm_device *dev, struct drm_file *file_private)
|
|
{
|
|
idr_for_each(&file_private->object_idr,
|
|
&drm_gem_object_release_handle, file_private);
|
|
idr_destroy(&file_private->object_idr);
|
|
}
|
|
|
|
void
|
|
drm_gem_object_release(struct drm_gem_object *obj)
|
|
{
|
|
WARN_ON(obj->dma_buf);
|
|
|
|
if (obj->filp)
|
|
fput(obj->filp);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_object_release);
|
|
|
|
/**
|
|
* Called after the last reference to the object has been lost.
|
|
* Must be called holding struct_ mutex
|
|
*
|
|
* Frees the object
|
|
*/
|
|
void
|
|
drm_gem_object_free(struct kref *kref)
|
|
{
|
|
struct drm_gem_object *obj = (struct drm_gem_object *) kref;
|
|
struct drm_device *dev = obj->dev;
|
|
|
|
BUG_ON(!mutex_is_locked(&dev->struct_mutex));
|
|
|
|
if (dev->driver->gem_free_object != NULL)
|
|
dev->driver->gem_free_object(obj);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_object_free);
|
|
|
|
void drm_gem_vm_open(struct vm_area_struct *vma)
|
|
{
|
|
struct drm_gem_object *obj = vma->vm_private_data;
|
|
|
|
drm_gem_object_reference(obj);
|
|
|
|
mutex_lock(&obj->dev->struct_mutex);
|
|
drm_vm_open_locked(obj->dev, vma);
|
|
mutex_unlock(&obj->dev->struct_mutex);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_vm_open);
|
|
|
|
void drm_gem_vm_close(struct vm_area_struct *vma)
|
|
{
|
|
struct drm_gem_object *obj = vma->vm_private_data;
|
|
struct drm_device *dev = obj->dev;
|
|
|
|
mutex_lock(&dev->struct_mutex);
|
|
drm_vm_close_locked(obj->dev, vma);
|
|
drm_gem_object_unreference(obj);
|
|
mutex_unlock(&dev->struct_mutex);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_vm_close);
|
|
|
|
/**
|
|
* drm_gem_mmap_obj - memory map a GEM object
|
|
* @obj: the GEM object to map
|
|
* @obj_size: the object size to be mapped, in bytes
|
|
* @vma: VMA for the area to be mapped
|
|
*
|
|
* Set up the VMA to prepare mapping of the GEM object using the gem_vm_ops
|
|
* provided by the driver. Depending on their requirements, drivers can either
|
|
* provide a fault handler in their gem_vm_ops (in which case any accesses to
|
|
* the object will be trapped, to perform migration, GTT binding, surface
|
|
* register allocation, or performance monitoring), or mmap the buffer memory
|
|
* synchronously after calling drm_gem_mmap_obj.
|
|
*
|
|
* This function is mainly intended to implement the DMABUF mmap operation, when
|
|
* the GEM object is not looked up based on its fake offset. To implement the
|
|
* DRM mmap operation, drivers should use the drm_gem_mmap() function.
|
|
*
|
|
* drm_gem_mmap_obj() assumes the user is granted access to the buffer while
|
|
* drm_gem_mmap() prevents unprivileged users from mapping random objects. So
|
|
* callers must verify access restrictions before calling this helper.
|
|
*
|
|
* NOTE: This function has to be protected with dev->struct_mutex
|
|
*
|
|
* Return 0 or success or -EINVAL if the object size is smaller than the VMA
|
|
* size, or if no gem_vm_ops are provided.
|
|
*/
|
|
int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
struct drm_device *dev = obj->dev;
|
|
|
|
lockdep_assert_held(&dev->struct_mutex);
|
|
|
|
/* Check for valid size. */
|
|
if (obj_size < vma->vm_end - vma->vm_start)
|
|
return -EINVAL;
|
|
|
|
if (!dev->driver->gem_vm_ops)
|
|
return -EINVAL;
|
|
|
|
vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP;
|
|
vma->vm_ops = dev->driver->gem_vm_ops;
|
|
vma->vm_private_data = obj;
|
|
vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
|
|
|
|
/* Take a ref for this mapping of the object, so that the fault
|
|
* handler can dereference the mmap offset's pointer to the object.
|
|
* This reference is cleaned up by the corresponding vm_close
|
|
* (which should happen whether the vma was created by this call, or
|
|
* by a vm_open due to mremap or partial unmap or whatever).
|
|
*/
|
|
drm_gem_object_reference(obj);
|
|
|
|
drm_vm_open_locked(dev, vma);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_mmap_obj);
|
|
|
|
/**
|
|
* drm_gem_mmap - memory map routine for GEM objects
|
|
* @filp: DRM file pointer
|
|
* @vma: VMA for the area to be mapped
|
|
*
|
|
* If a driver supports GEM object mapping, mmap calls on the DRM file
|
|
* descriptor will end up here.
|
|
*
|
|
* Look up the GEM object based on the offset passed in (vma->vm_pgoff will
|
|
* contain the fake offset we created when the GTT map ioctl was called on
|
|
* the object) and map it with a call to drm_gem_mmap_obj().
|
|
*
|
|
* If the caller is not granted access to the buffer object, the mmap will fail
|
|
* with EACCES. Please see the vma manager for more information.
|
|
*/
|
|
int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
|
|
{
|
|
struct drm_file *priv = filp->private_data;
|
|
struct drm_device *dev = priv->minor->dev;
|
|
struct drm_gem_mm *mm = dev->mm_private;
|
|
struct drm_gem_object *obj;
|
|
struct drm_vma_offset_node *node;
|
|
int ret = 0;
|
|
|
|
if (drm_device_is_unplugged(dev))
|
|
return -ENODEV;
|
|
|
|
mutex_lock(&dev->struct_mutex);
|
|
|
|
node = drm_vma_offset_exact_lookup(&mm->vma_manager, vma->vm_pgoff,
|
|
vma_pages(vma));
|
|
if (!node) {
|
|
mutex_unlock(&dev->struct_mutex);
|
|
return drm_mmap(filp, vma);
|
|
} else if (!drm_vma_node_is_allowed(node, filp)) {
|
|
mutex_unlock(&dev->struct_mutex);
|
|
return -EACCES;
|
|
}
|
|
|
|
obj = container_of(node, struct drm_gem_object, vma_node);
|
|
ret = drm_gem_mmap_obj(obj, drm_vma_node_size(node) << PAGE_SHIFT, vma);
|
|
|
|
mutex_unlock(&dev->struct_mutex);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_mmap);
|