![Dave Airlie](/assets/img/avatar_default.png)
Currently we have a problem with this: 1. i915: create gem object 2. i915: export gem object to prime 3. radeon: import gem object 4. close prime fd 5. radeon: unref object 6. i915: unref object i915 has an imported object reference in its file priv, that isn't cleaned up properly until fd close. The reference gets added at step 2, but at step 6 we don't have enough info to clean it up. The solution is to take a reference on the dma-buf when we export it, and drop the reference when the gem handle goes away. So when we export a dma_buf from a gem object, we keep track of it with the handle, we take a reference to the dma_buf. When we close the handle (i.e. userspace is finished with the buffer), we drop the reference to the dma_buf, and it gets collected. This patch isn't meant to fix any other problem or bikesheds, and it doesn't fix any races with other scenarios. v1.1: move export symbol line back up. v2: okay I had to do a bit more, as the first patch showed a leak on one of my tests, that I found using the dma-buf debugfs support, the problem case is exporting a buffer twice with the same handle, we'd add another export handle for it unnecessarily, however we now fail if we try to export the same object with a different gem handle, however I'm not sure if that is a case I want to support, and I've gotten the code to WARN_ON if we hit something like that. v2.1: rebase this patch, write better commit msg. v3: cleanup error handling, track import vs export in linked list, these two patches were separate previously, but seem to work better like this. v4: danvet is correct, this code is no longer useful, since the buffer better exist, so remove it. v5: always take a reference to the dma buf object, import or export. (Imre Deak contributed this originally) v6: square the circle, remove import vs export tracking now that there is no difference Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: stable@vger.kernel.org Signed-off-by: Dave Airlie <airlied@redhat.com>
722 lines
18 KiB
C
722 lines
18 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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/** @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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spin_lock_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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if (drm_ht_create(&mm->offset_hash, 12)) {
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kfree(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_ht_remove(&mm->offset_hash);
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kfree(mm);
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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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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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BUG_ON((size & (PAGE_SIZE - 1)) != 0);
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obj->dev = dev;
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obj->filp = shmem_file_setup("drm mm object", size, VM_NORESERVE);
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if (IS_ERR(obj->filp))
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return PTR_ERR(obj->filp);
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kref_init(&obj->refcount);
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atomic_set(&obj->handle_count, 0);
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obj->size = size;
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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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int 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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atomic_set(&obj->handle_count, 0);
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obj->size = size;
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return 0;
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}
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EXPORT_SYMBOL(drm_gem_private_object_init);
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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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obj = kzalloc(sizeof(*obj), GFP_KERNEL);
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if (!obj)
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goto free;
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if (drm_gem_object_init(dev, obj, size) != 0)
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goto free;
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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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goto fput;
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}
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return obj;
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fput:
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/* Object_init mangles the global counters - readjust them. */
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fput(obj->filp);
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free:
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kfree(obj);
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return NULL;
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}
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EXPORT_SYMBOL(drm_gem_object_alloc);
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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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if (obj->import_attach) {
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drm_prime_remove_buf_handle(&filp->prime,
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obj->import_attach->dmabuf);
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}
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if (obj->export_dma_buf) {
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drm_prime_remove_buf_handle(&filp->prime,
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obj->export_dma_buf);
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}
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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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drm_gem_remove_prime_handles(obj, 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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* 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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struct drm_device *dev = obj->dev;
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int ret;
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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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spin_unlock(&file_priv->table_lock);
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idr_preload_end();
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if (ret < 0)
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return ret;
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*handlep = ret;
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drm_gem_object_handle_reference(obj);
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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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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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struct drm_map_list *list = &obj->map_list;
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drm_ht_remove_item(&mm->offset_hash, &list->hash);
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drm_mm_put_block(list->file_offset_node);
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kfree(list->map);
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list->map = NULL;
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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 - 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
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drm_gem_create_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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struct drm_map_list *list;
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struct drm_local_map *map;
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int ret;
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/* Set the object up for mmap'ing */
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list = &obj->map_list;
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list->map = kzalloc(sizeof(struct drm_map_list), GFP_KERNEL);
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if (!list->map)
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return -ENOMEM;
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map = list->map;
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map->type = _DRM_GEM;
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map->size = obj->size;
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map->handle = obj;
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/* Get a DRM GEM mmap offset allocated... */
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list->file_offset_node = drm_mm_search_free(&mm->offset_manager,
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obj->size / PAGE_SIZE, 0, false);
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if (!list->file_offset_node) {
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DRM_ERROR("failed to allocate offset for bo %d\n", obj->name);
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ret = -ENOSPC;
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goto out_free_list;
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}
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list->file_offset_node = drm_mm_get_block(list->file_offset_node,
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obj->size / PAGE_SIZE, 0);
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if (!list->file_offset_node) {
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ret = -ENOMEM;
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goto out_free_list;
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}
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list->hash.key = list->file_offset_node->start;
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ret = drm_ht_insert_item(&mm->offset_hash, &list->hash);
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if (ret) {
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DRM_ERROR("failed to add to map hash\n");
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goto out_free_mm;
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}
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return 0;
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out_free_mm:
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drm_mm_put_block(list->file_offset_node);
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out_free_list:
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kfree(list->map);
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list->map = NULL;
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return ret;
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}
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EXPORT_SYMBOL(drm_gem_create_mmap_offset);
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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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u32 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 -ENOENT;
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idr_preload(GFP_KERNEL);
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spin_lock(&dev->object_name_lock);
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if (!obj->name) {
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ret = idr_alloc(&dev->object_name_idr, obj, 1, 0, GFP_NOWAIT);
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obj->name = ret;
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args->name = (uint64_t) obj->name;
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spin_unlock(&dev->object_name_lock);
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idr_preload_end();
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if (ret < 0)
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goto err;
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ret = 0;
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/* Allocate a reference for the name table. */
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drm_gem_object_reference(obj);
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} else {
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args->name = (uint64_t) obj->name;
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spin_unlock(&dev->object_name_lock);
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idr_preload_end();
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ret = 0;
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}
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err:
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drm_gem_object_unreference_unlocked(obj);
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return ret;
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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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u32 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);
|
|
obj = idr_find(&dev->object_name_idr, (int) args->name);
|
|
if (obj)
|
|
drm_gem_object_reference(obj);
|
|
spin_unlock(&dev->object_name_lock);
|
|
if (!obj)
|
|
return -ENOENT;
|
|
|
|
ret = drm_gem_handle_create(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;
|
|
|
|
drm_gem_remove_prime_handles(obj, file_priv);
|
|
|
|
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)
|
|
{
|
|
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);
|
|
|
|
static void drm_gem_object_ref_bug(struct kref *list_kref)
|
|
{
|
|
BUG();
|
|
}
|
|
|
|
/**
|
|
* Called after the last handle to the object has been closed
|
|
*
|
|
* Removes any name for the object. Note that this must be
|
|
* called before drm_gem_object_free or we'll be touching
|
|
* freed memory
|
|
*/
|
|
void drm_gem_object_handle_free(struct drm_gem_object *obj)
|
|
{
|
|
struct drm_device *dev = obj->dev;
|
|
|
|
/* Remove any name for this object */
|
|
spin_lock(&dev->object_name_lock);
|
|
if (obj->name) {
|
|
idr_remove(&dev->object_name_idr, obj->name);
|
|
obj->name = 0;
|
|
spin_unlock(&dev->object_name_lock);
|
|
/*
|
|
* The object name held a reference to this object, drop
|
|
* that now.
|
|
*
|
|
* This cannot be the last reference, since the handle holds one too.
|
|
*/
|
|
kref_put(&obj->refcount, drm_gem_object_ref_bug);
|
|
} else
|
|
spin_unlock(&dev->object_name_lock);
|
|
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_object_handle_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 - 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.
|
|
*
|
|
* If we find the 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), we set up the driver fault handler so that any accesses
|
|
* to the object can be trapped, to perform migration, GTT binding, surface
|
|
* register allocation, or performance monitoring.
|
|
*/
|
|
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_local_map *map = NULL;
|
|
struct drm_gem_object *obj;
|
|
struct drm_hash_item *hash;
|
|
int ret = 0;
|
|
|
|
if (drm_device_is_unplugged(dev))
|
|
return -ENODEV;
|
|
|
|
mutex_lock(&dev->struct_mutex);
|
|
|
|
if (drm_ht_find_item(&mm->offset_hash, vma->vm_pgoff, &hash)) {
|
|
mutex_unlock(&dev->struct_mutex);
|
|
return drm_mmap(filp, vma);
|
|
}
|
|
|
|
map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
|
|
if (!map ||
|
|
((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN))) {
|
|
ret = -EPERM;
|
|
goto out_unlock;
|
|
}
|
|
|
|
/* Check for valid size. */
|
|
if (map->size < vma->vm_end - vma->vm_start) {
|
|
ret = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
|
|
obj = map->handle;
|
|
if (!obj->dev->driver->gem_vm_ops) {
|
|
ret = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
|
|
vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP;
|
|
vma->vm_ops = obj->dev->driver->gem_vm_ops;
|
|
vma->vm_private_data = map->handle;
|
|
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);
|
|
|
|
out_unlock:
|
|
mutex_unlock(&dev->struct_mutex);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_mmap);
|