ae14dc0505
The page protections need to be checked whether they need to be more flexible. Signed-off-by: Dave Airlie <airlied@redhat.com>
532 lines
14 KiB
C
532 lines
14 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 "drmP.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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#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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/**
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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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spin_lock_init(&dev->object_name_lock);
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idr_init(&dev->object_name_idr);
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atomic_set(&dev->object_count, 0);
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atomic_set(&dev->object_memory, 0);
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atomic_set(&dev->pin_count, 0);
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atomic_set(&dev->pin_memory, 0);
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atomic_set(&dev->gtt_count, 0);
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atomic_set(&dev->gtt_memory, 0);
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mm = drm_calloc(1, sizeof(struct drm_gem_mm), DRM_MEM_MM);
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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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if (drm_ht_create(&mm->offset_hash, 19)) {
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drm_free(mm, sizeof(struct drm_gem_mm), DRM_MEM_MM);
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return -ENOMEM;
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}
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if (drm_mm_init(&mm->offset_manager, DRM_FILE_PAGE_OFFSET_START,
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DRM_FILE_PAGE_OFFSET_SIZE)) {
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drm_free(mm, sizeof(struct drm_gem_mm), DRM_MEM_MM);
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drm_ht_remove(&mm->offset_hash);
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return -ENOMEM;
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}
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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_mm_takedown(&mm->offset_manager);
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drm_ht_remove(&mm->offset_hash);
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drm_free(mm, sizeof(struct drm_gem_mm), DRM_MEM_MM);
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dev->mm_private = NULL;
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}
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/**
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* Allocate a GEM object of the specified size with shmfs backing store
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*/
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struct drm_gem_object *
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drm_gem_object_alloc(struct drm_device *dev, size_t size)
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{
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struct drm_gem_object *obj;
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BUG_ON((size & (PAGE_SIZE - 1)) != 0);
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obj = kcalloc(1, sizeof(*obj), GFP_KERNEL);
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obj->dev = dev;
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obj->filp = shmem_file_setup("drm mm object", size, 0);
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if (IS_ERR(obj->filp)) {
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kfree(obj);
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return NULL;
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}
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kref_init(&obj->refcount);
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kref_init(&obj->handlecount);
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obj->size = size;
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if (dev->driver->gem_init_object != NULL &&
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dev->driver->gem_init_object(obj) != 0) {
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fput(obj->filp);
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kfree(obj);
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return NULL;
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}
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atomic_inc(&dev->object_count);
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atomic_add(obj->size, &dev->object_memory);
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return obj;
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}
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EXPORT_SYMBOL(drm_gem_object_alloc);
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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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static int
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drm_gem_handle_delete(struct drm_file *filp, int 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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mutex_lock(&dev->struct_mutex);
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drm_gem_object_handle_unreference(obj);
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mutex_unlock(&dev->struct_mutex);
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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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int *handlep)
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{
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int ret;
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/*
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* Get the user-visible handle using idr.
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*/
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again:
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/* ensure there is space available to allocate a handle */
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if (idr_pre_get(&file_priv->object_idr, GFP_KERNEL) == 0)
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return -ENOMEM;
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/* do the allocation under our spinlock */
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spin_lock(&file_priv->table_lock);
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ret = idr_get_new_above(&file_priv->object_idr, obj, 1, handlep);
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spin_unlock(&file_priv->table_lock);
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if (ret == -EAGAIN)
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goto again;
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if (ret != 0)
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return ret;
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drm_gem_object_handle_reference(obj);
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return 0;
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}
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EXPORT_SYMBOL(drm_gem_handle_create);
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/** Returns a reference to the object named by the handle. */
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struct drm_gem_object *
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drm_gem_object_lookup(struct drm_device *dev, struct drm_file *filp,
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int handle)
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{
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struct drm_gem_object *obj;
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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 NULL;
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}
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drm_gem_object_reference(obj);
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spin_unlock(&filp->table_lock);
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return obj;
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}
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EXPORT_SYMBOL(drm_gem_object_lookup);
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/**
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* Releases the handle to an mm object.
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*/
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int
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drm_gem_close_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_gem_close *args = data;
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int ret;
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if (!(dev->driver->driver_features & DRIVER_GEM))
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return -ENODEV;
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ret = drm_gem_handle_delete(file_priv, args->handle);
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return ret;
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}
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/**
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* Create a global name for an object, returning the name.
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*
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* Note that the name does not hold a reference; when the object
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* is freed, the name goes away.
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*/
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int
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drm_gem_flink_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_gem_flink *args = data;
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struct drm_gem_object *obj;
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int ret;
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if (!(dev->driver->driver_features & DRIVER_GEM))
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return -ENODEV;
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obj = drm_gem_object_lookup(dev, file_priv, args->handle);
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if (obj == NULL)
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return -EBADF;
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again:
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if (idr_pre_get(&dev->object_name_idr, GFP_KERNEL) == 0)
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return -ENOMEM;
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spin_lock(&dev->object_name_lock);
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if (obj->name) {
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args->name = obj->name;
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spin_unlock(&dev->object_name_lock);
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return 0;
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}
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ret = idr_get_new_above(&dev->object_name_idr, obj, 1,
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&obj->name);
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spin_unlock(&dev->object_name_lock);
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if (ret == -EAGAIN)
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goto again;
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if (ret != 0) {
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mutex_lock(&dev->struct_mutex);
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drm_gem_object_unreference(obj);
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mutex_unlock(&dev->struct_mutex);
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return ret;
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}
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/*
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* Leave the reference from the lookup around as the
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* name table now holds one
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*/
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args->name = (uint64_t) obj->name;
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return 0;
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}
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/**
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* Open an object using the global name, returning a handle and the size.
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*
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* This handle (of course) holds a reference to the object, so the object
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* will not go away until the handle is deleted.
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*/
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int
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drm_gem_open_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_gem_open *args = data;
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struct drm_gem_object *obj;
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int ret;
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int handle;
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if (!(dev->driver->driver_features & DRIVER_GEM))
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return -ENODEV;
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spin_lock(&dev->object_name_lock);
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obj = idr_find(&dev->object_name_idr, (int) args->name);
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if (obj)
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drm_gem_object_reference(obj);
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spin_unlock(&dev->object_name_lock);
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if (!obj)
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return -ENOENT;
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ret = drm_gem_handle_create(file_priv, obj, &handle);
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mutex_lock(&dev->struct_mutex);
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drm_gem_object_unreference(obj);
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mutex_unlock(&dev->struct_mutex);
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if (ret)
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return ret;
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args->handle = handle;
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args->size = obj->size;
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return 0;
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}
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/**
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* Called at device open time, sets up the structure for handling refcounting
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* of mm objects.
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*/
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void
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drm_gem_open(struct drm_device *dev, struct drm_file *file_private)
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{
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idr_init(&file_private->object_idr);
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spin_lock_init(&file_private->table_lock);
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}
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/**
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* Called at device close to release the file's
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* handle references on objects.
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*/
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static int
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drm_gem_object_release_handle(int id, void *ptr, void *data)
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{
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struct drm_gem_object *obj = ptr;
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drm_gem_object_handle_unreference(obj);
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return 0;
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}
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/**
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* Called at close time when the filp is going away.
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*
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* Releases any remaining references on objects by this filp.
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*/
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void
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drm_gem_release(struct drm_device *dev, struct drm_file *file_private)
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{
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mutex_lock(&dev->struct_mutex);
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idr_for_each(&file_private->object_idr,
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&drm_gem_object_release_handle, NULL);
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idr_destroy(&file_private->object_idr);
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mutex_unlock(&dev->struct_mutex);
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}
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/**
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* Called after the last reference to the object has been lost.
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*
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* Frees the object
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*/
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void
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drm_gem_object_free(struct kref *kref)
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{
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struct drm_gem_object *obj = (struct drm_gem_object *) kref;
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struct drm_device *dev = obj->dev;
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BUG_ON(!mutex_is_locked(&dev->struct_mutex));
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if (dev->driver->gem_free_object != NULL)
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dev->driver->gem_free_object(obj);
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fput(obj->filp);
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atomic_dec(&dev->object_count);
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atomic_sub(obj->size, &dev->object_memory);
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kfree(obj);
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}
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EXPORT_SYMBOL(drm_gem_object_free);
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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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void
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drm_gem_object_handle_free(struct kref *kref)
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{
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struct drm_gem_object *obj = container_of(kref,
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struct drm_gem_object,
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handlecount);
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struct drm_device *dev = obj->dev;
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/* Remove any name for this object */
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spin_lock(&dev->object_name_lock);
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if (obj->name) {
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idr_remove(&dev->object_name_idr, obj->name);
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spin_unlock(&dev->object_name_lock);
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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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drm_gem_object_unreference(obj);
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} else
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spin_unlock(&dev->object_name_lock);
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}
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EXPORT_SYMBOL(drm_gem_object_handle_free);
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/**
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* drm_gem_mmap - memory map routine for GEM objects
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* @filp: DRM file pointer
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* @vma: VMA for the area to be mapped
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*
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* If a driver supports GEM object mapping, mmap calls on the DRM file
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* descriptor will end up here.
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*
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* If we find the object based on the offset passed in (vma->vm_pgoff will
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* contain the fake offset we created when the GTT map ioctl was called on
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* the object), we set up the driver fault handler so that any accesses
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* to the object can be trapped, to perform migration, GTT binding, surface
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* register allocation, or performance monitoring.
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*/
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int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
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{
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struct drm_file *priv = filp->private_data;
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struct drm_device *dev = priv->minor->dev;
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struct drm_gem_mm *mm = dev->mm_private;
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struct drm_map *map = NULL;
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struct drm_gem_object *obj;
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struct drm_hash_item *hash;
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unsigned long prot;
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int ret = 0;
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mutex_lock(&dev->struct_mutex);
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if (drm_ht_find_item(&mm->offset_hash, vma->vm_pgoff, &hash)) {
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mutex_unlock(&dev->struct_mutex);
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return drm_mmap(filp, vma);
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}
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map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
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if (!map ||
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((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN))) {
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ret = -EPERM;
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goto out_unlock;
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}
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/* Check for valid size. */
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if (map->size < vma->vm_end - vma->vm_start) {
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ret = -EINVAL;
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goto out_unlock;
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}
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obj = map->handle;
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if (!obj->dev->driver->gem_vm_ops) {
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ret = -EINVAL;
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goto out_unlock;
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}
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vma->vm_flags |= VM_RESERVED | VM_IO | VM_PFNMAP | VM_DONTEXPAND;
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vma->vm_ops = obj->dev->driver->gem_vm_ops;
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vma->vm_private_data = map->handle;
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/* FIXME: use pgprot_writecombine when available */
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prot = pgprot_val(vma->vm_page_prot);
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#ifdef CONFIG_X86
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prot |= _PAGE_CACHE_WC;
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#endif
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vma->vm_page_prot = __pgprot(prot);
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vma->vm_file = filp; /* Needed for drm_vm_open() */
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drm_vm_open_locked(vma);
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out_unlock:
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mutex_unlock(&dev->struct_mutex);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_mmap);
|