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![ChunyouTang](/assets/img/avatar_default.png)
when goto err_free, the object had init, so it should be release when fail. Signed-off-by: ChunyouTang <tangchunyou@163.com> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Link: https://patchwork.freedesktop.org/patch/msgid/20221119064131.364-1-tangchunyou@163.com
1468 lines
39 KiB
C
1468 lines
39 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/dma-buf.h>
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/iosys-map.h>
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#include <linux/mem_encrypt.h>
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#include <linux/mm.h>
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#include <linux/mman.h>
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#include <linux/module.h>
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#include <linux/pagemap.h>
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#include <linux/pagevec.h>
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#include <linux/shmem_fs.h>
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#include <linux/slab.h>
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#include <linux/string_helpers.h>
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#include <linux/types.h>
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#include <linux/uaccess.h>
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#include <drm/drm.h>
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#include <drm/drm_device.h>
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#include <drm/drm_drv.h>
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#include <drm/drm_file.h>
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#include <drm/drm_gem.h>
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#include <drm/drm_managed.h>
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#include <drm/drm_print.h>
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#include <drm/drm_vma_manager.h>
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#include "drm_internal.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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static void
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drm_gem_init_release(struct drm_device *dev, void *ptr)
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{
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drm_vma_offset_manager_destroy(dev->vma_offset_manager);
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}
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/**
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* drm_gem_init - Initialize the GEM device fields
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* @dev: drm_devic structure to initialize
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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_vma_offset_manager *vma_offset_manager;
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mutex_init(&dev->object_name_lock);
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idr_init_base(&dev->object_name_idr, 1);
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vma_offset_manager = drmm_kzalloc(dev, sizeof(*vma_offset_manager),
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GFP_KERNEL);
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if (!vma_offset_manager) {
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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->vma_offset_manager = vma_offset_manager;
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drm_vma_offset_manager_init(vma_offset_manager,
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DRM_FILE_PAGE_OFFSET_START,
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DRM_FILE_PAGE_OFFSET_SIZE);
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return drmm_add_action(dev, drm_gem_init_release, NULL);
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}
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/**
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* drm_gem_object_init - initialize an allocated shmem-backed GEM object
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* @dev: drm_device the object should be initialized for
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* @obj: drm_gem_object to initialize
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* @size: object size
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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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drm_gem_private_object_init(dev, obj, size);
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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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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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* drm_gem_private_object_init - initialize an allocated private GEM object
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* @dev: drm_device the object should be initialized for
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* @obj: drm_gem_object to initialize
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* @size: object size
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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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dma_resv_init(&obj->_resv);
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if (!obj->resv)
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obj->resv = &obj->_resv;
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drm_vma_node_reset(&obj->vma_node);
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INIT_LIST_HEAD(&obj->lru_node);
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}
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EXPORT_SYMBOL(drm_gem_private_object_init);
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/**
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* drm_gem_private_object_fini - Finalize a failed drm_gem_object
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* @obj: drm_gem_object
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*
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* Uninitialize an already allocated GEM object when it initialized failed
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*/
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void drm_gem_private_object_fini(struct drm_gem_object *obj)
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{
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WARN_ON(obj->dma_buf);
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dma_resv_fini(&obj->_resv);
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}
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EXPORT_SYMBOL(drm_gem_private_object_fini);
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/**
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* drm_gem_object_handle_free - release resources bound to userspace handles
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* @obj: GEM object to clean up.
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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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}
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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_put_unlocked(struct drm_gem_object *obj)
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{
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struct drm_device *dev = obj->dev;
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bool final = false;
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if (WARN_ON(READ_ONCE(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(&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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final = true;
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}
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mutex_unlock(&dev->object_name_lock);
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if (final)
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drm_gem_object_put(obj);
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}
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/*
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* Called at device or object 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_file *file_priv = data;
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struct drm_gem_object *obj = ptr;
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if (obj->funcs->close)
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obj->funcs->close(obj, file_priv);
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drm_prime_remove_buf_handle(&file_priv->prime, id);
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drm_vma_node_revoke(&obj->vma_node, file_priv);
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drm_gem_object_handle_put_unlocked(obj);
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return 0;
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}
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/**
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* drm_gem_handle_delete - deletes the given file-private handle
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* @filp: drm file-private structure to use for the handle look up
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* @handle: userspace handle to delete
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*
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* Removes the GEM handle from the @filp lookup table which has been added with
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* drm_gem_handle_create(). If this is the last handle also cleans up linked
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* resources like GEM names.
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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_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_replace(&filp->object_idr, NULL, handle);
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spin_unlock(&filp->table_lock);
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if (IS_ERR_OR_NULL(obj))
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return -EINVAL;
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/* Release driver's reference and decrement refcount. */
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drm_gem_object_release_handle(handle, obj, filp);
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/* And finally make the handle available for future allocations. */
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spin_lock(&filp->table_lock);
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idr_remove(&filp->object_idr, handle);
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spin_unlock(&filp->table_lock);
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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_map_offset - return the fake mmap offset for a gem object
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* @file: drm file-private structure containing the gem object
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* @dev: corresponding drm_device
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* @handle: gem object handle
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* @offset: return location for the fake mmap offset
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*
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* This implements the &drm_driver.dumb_map_offset kms driver callback for
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* drivers which use gem to manage their backing storage.
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*
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* Returns:
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* 0 on success or a negative error code on failure.
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*/
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int drm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
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u32 handle, u64 *offset)
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{
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struct drm_gem_object *obj;
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int ret;
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obj = drm_gem_object_lookup(file, handle);
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if (!obj)
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return -ENOENT;
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/* Don't allow imported objects to be mapped */
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if (obj->import_attach) {
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ret = -EINVAL;
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goto out;
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}
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ret = drm_gem_create_mmap_offset(obj);
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if (ret)
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goto out;
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*offset = drm_vma_node_offset_addr(&obj->vma_node);
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out:
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drm_gem_object_put(obj);
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return ret;
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}
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EXPORT_SYMBOL_GPL(drm_gem_dumb_map_offset);
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int drm_gem_dumb_destroy(struct drm_file *file,
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struct drm_device *dev,
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u32 handle)
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{
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return drm_gem_handle_delete(file, handle);
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}
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/**
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* drm_gem_handle_create_tail - internal functions to create a handle
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* @file_priv: drm file-private structure to register the handle for
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* @obj: object to register
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* @handlep: pointer to return the created handle to the caller
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*
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* This expects the &drm_device.object_name_lock to be held already and will
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* drop it before returning. Used to avoid races in establishing new handles
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* when importing an object from either an flink name or a dma-buf.
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*
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* Handles must be release again through drm_gem_handle_delete(). This is done
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* when userspace closes @file_priv for all attached handles, or through the
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* GEM_CLOSE ioctl for individual handles.
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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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u32 handle;
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int ret;
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WARN_ON(!mutex_is_locked(&dev->object_name_lock));
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if (obj->handle_count++ == 0)
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drm_gem_object_get(obj);
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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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mutex_unlock(&dev->object_name_lock);
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if (ret < 0)
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goto err_unref;
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handle = ret;
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ret = drm_vma_node_allow(&obj->vma_node, file_priv);
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if (ret)
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goto err_remove;
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if (obj->funcs->open) {
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ret = obj->funcs->open(obj, file_priv);
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if (ret)
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goto err_revoke;
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}
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*handlep = handle;
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return 0;
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err_revoke:
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drm_vma_node_revoke(&obj->vma_node, file_priv);
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err_remove:
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spin_lock(&file_priv->table_lock);
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idr_remove(&file_priv->object_idr, handle);
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spin_unlock(&file_priv->table_lock);
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err_unref:
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drm_gem_object_handle_put_unlocked(obj);
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return ret;
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}
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/**
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* drm_gem_handle_create - create a gem handle for an object
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* @file_priv: drm file-private structure to register the handle for
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* @obj: object to register
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* @handlep: pointer to return the created handle to the caller
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*
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* Create a handle for this object. This adds a handle reference to the object,
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* which includes a regular reference count. Callers will likely want to
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* dereference the object afterwards.
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*
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* Since this publishes @obj to userspace it must be fully set up by this point,
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* drivers must call this last in their buffer object creation callbacks.
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*/
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int drm_gem_handle_create(struct drm_file *file_priv,
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struct drm_gem_object *obj,
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u32 *handlep)
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{
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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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/**
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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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* Note that drm_gem_object_release() already calls this function, so drivers
|
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* don't have to take care of releasing the mmap offset themselves when freeing
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* the GEM object.
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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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drm_vma_offset_remove(dev->vma_offset_manager, &obj->vma_node);
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}
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EXPORT_SYMBOL(drm_gem_free_mmap_offset);
|
|
|
|
/**
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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
|
|
* structures.
|
|
*
|
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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. &drm_gem_object.size).
|
|
* Otherwise just use drm_gem_create_mmap_offset().
|
|
*
|
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* This function is idempotent and handles an already allocated mmap offset
|
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* transparently. Drivers do not need to check for this case.
|
|
*/
|
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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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|
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return drm_vma_offset_add(dev->vma_offset_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);
|
|
|
|
/**
|
|
* 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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* GEM memory mapping works by handing back to userspace a fake mmap offset
|
|
* 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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* Drivers can call drm_gem_free_mmap_offset() before freeing @obj to release
|
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* the fake offset again.
|
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*/
|
|
int drm_gem_create_mmap_offset(struct drm_gem_object *obj)
|
|
{
|
|
return drm_gem_create_mmap_offset_size(obj, obj->size);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_create_mmap_offset);
|
|
|
|
/*
|
|
* Move pages to appropriate lru and release the pagevec, decrementing the
|
|
* ref count of those pages.
|
|
*/
|
|
static void drm_gem_check_release_pagevec(struct pagevec *pvec)
|
|
{
|
|
check_move_unevictable_pages(pvec);
|
|
__pagevec_release(pvec);
|
|
cond_resched();
|
|
}
|
|
|
|
/**
|
|
* drm_gem_get_pages - helper to allocate backing pages for a GEM object
|
|
* from shmem
|
|
* @obj: obj in question
|
|
*
|
|
* This reads the page-array of the shmem-backing storage of the given gem
|
|
* object. An array of pages is returned. If a page is not allocated or
|
|
* swapped-out, this will allocate/swap-in the required pages. Note that the
|
|
* whole object is covered by the page-array and pinned in memory.
|
|
*
|
|
* Use drm_gem_put_pages() to release the array and unpin all pages.
|
|
*
|
|
* This uses the GFP-mask set on the shmem-mapping (see mapping_set_gfp_mask()).
|
|
* If you require other GFP-masks, you have to do those allocations yourself.
|
|
*
|
|
* Note that you are not allowed to change gfp-zones during runtime. That is,
|
|
* shmem_read_mapping_page_gfp() must be called with the same gfp_zone(gfp) as
|
|
* set during initialization. If you have special zone constraints, set them
|
|
* after drm_gem_object_init() via mapping_set_gfp_mask(). shmem-core takes care
|
|
* to keep pages in the required zone during swap-in.
|
|
*
|
|
* This function is only valid on objects initialized with
|
|
* drm_gem_object_init(), but not for those initialized with
|
|
* drm_gem_private_object_init() only.
|
|
*/
|
|
struct page **drm_gem_get_pages(struct drm_gem_object *obj)
|
|
{
|
|
struct address_space *mapping;
|
|
struct page *p, **pages;
|
|
struct pagevec pvec;
|
|
int i, npages;
|
|
|
|
|
|
if (WARN_ON(!obj->filp))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
/* This is the shared memory object that backs the GEM resource */
|
|
mapping = obj->filp->f_mapping;
|
|
|
|
/* 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;
|
|
|
|
pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
|
|
if (pages == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
mapping_set_unevictable(mapping);
|
|
|
|
for (i = 0; i < npages; i++) {
|
|
p = shmem_read_mapping_page(mapping, i);
|
|
if (IS_ERR(p))
|
|
goto fail;
|
|
pages[i] = p;
|
|
|
|
/* Make sure shmem keeps __GFP_DMA32 allocated pages in the
|
|
* correct region during swapin. Note that this requires
|
|
* __GFP_DMA32 to be set in mapping_gfp_mask(inode->i_mapping)
|
|
* so shmem can relocate pages during swapin if required.
|
|
*/
|
|
BUG_ON(mapping_gfp_constraint(mapping, __GFP_DMA32) &&
|
|
(page_to_pfn(p) >= 0x00100000UL));
|
|
}
|
|
|
|
return pages;
|
|
|
|
fail:
|
|
mapping_clear_unevictable(mapping);
|
|
pagevec_init(&pvec);
|
|
while (i--) {
|
|
if (!pagevec_add(&pvec, pages[i]))
|
|
drm_gem_check_release_pagevec(&pvec);
|
|
}
|
|
if (pagevec_count(&pvec))
|
|
drm_gem_check_release_pagevec(&pvec);
|
|
|
|
kvfree(pages);
|
|
return ERR_CAST(p);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_get_pages);
|
|
|
|
/**
|
|
* 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;
|
|
struct address_space *mapping;
|
|
struct pagevec pvec;
|
|
|
|
mapping = file_inode(obj->filp)->i_mapping;
|
|
mapping_clear_unevictable(mapping);
|
|
|
|
/* 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;
|
|
|
|
pagevec_init(&pvec);
|
|
for (i = 0; i < npages; i++) {
|
|
if (!pages[i])
|
|
continue;
|
|
|
|
if (dirty)
|
|
set_page_dirty(pages[i]);
|
|
|
|
if (accessed)
|
|
mark_page_accessed(pages[i]);
|
|
|
|
/* Undo the reference we took when populating the table */
|
|
if (!pagevec_add(&pvec, pages[i]))
|
|
drm_gem_check_release_pagevec(&pvec);
|
|
}
|
|
if (pagevec_count(&pvec))
|
|
drm_gem_check_release_pagevec(&pvec);
|
|
|
|
kvfree(pages);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_put_pages);
|
|
|
|
static int objects_lookup(struct drm_file *filp, u32 *handle, int count,
|
|
struct drm_gem_object **objs)
|
|
{
|
|
int i, ret = 0;
|
|
struct drm_gem_object *obj;
|
|
|
|
spin_lock(&filp->table_lock);
|
|
|
|
for (i = 0; i < count; i++) {
|
|
/* Check if we currently have a reference on the object */
|
|
obj = idr_find(&filp->object_idr, handle[i]);
|
|
if (!obj) {
|
|
ret = -ENOENT;
|
|
break;
|
|
}
|
|
drm_gem_object_get(obj);
|
|
objs[i] = obj;
|
|
}
|
|
spin_unlock(&filp->table_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* drm_gem_objects_lookup - look up GEM objects from an array of handles
|
|
* @filp: DRM file private date
|
|
* @bo_handles: user pointer to array of userspace handle
|
|
* @count: size of handle array
|
|
* @objs_out: returned pointer to array of drm_gem_object pointers
|
|
*
|
|
* Takes an array of userspace handles and returns a newly allocated array of
|
|
* GEM objects.
|
|
*
|
|
* For a single handle lookup, use drm_gem_object_lookup().
|
|
*
|
|
* Returns:
|
|
*
|
|
* @objs filled in with GEM object pointers. Returned GEM objects need to be
|
|
* released with drm_gem_object_put(). -ENOENT is returned on a lookup
|
|
* failure. 0 is returned on success.
|
|
*
|
|
*/
|
|
int drm_gem_objects_lookup(struct drm_file *filp, void __user *bo_handles,
|
|
int count, struct drm_gem_object ***objs_out)
|
|
{
|
|
int ret;
|
|
u32 *handles;
|
|
struct drm_gem_object **objs;
|
|
|
|
if (!count)
|
|
return 0;
|
|
|
|
objs = kvmalloc_array(count, sizeof(struct drm_gem_object *),
|
|
GFP_KERNEL | __GFP_ZERO);
|
|
if (!objs)
|
|
return -ENOMEM;
|
|
|
|
*objs_out = objs;
|
|
|
|
handles = kvmalloc_array(count, sizeof(u32), GFP_KERNEL);
|
|
if (!handles) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (copy_from_user(handles, bo_handles, count * sizeof(u32))) {
|
|
ret = -EFAULT;
|
|
DRM_DEBUG("Failed to copy in GEM handles\n");
|
|
goto out;
|
|
}
|
|
|
|
ret = objects_lookup(filp, handles, count, objs);
|
|
out:
|
|
kvfree(handles);
|
|
return ret;
|
|
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_objects_lookup);
|
|
|
|
/**
|
|
* drm_gem_object_lookup - look up a GEM object from its handle
|
|
* @filp: DRM file private date
|
|
* @handle: userspace handle
|
|
*
|
|
* Returns:
|
|
*
|
|
* A reference to the object named by the handle if such exists on @filp, NULL
|
|
* otherwise.
|
|
*
|
|
* If looking up an array of handles, use drm_gem_objects_lookup().
|
|
*/
|
|
struct drm_gem_object *
|
|
drm_gem_object_lookup(struct drm_file *filp, u32 handle)
|
|
{
|
|
struct drm_gem_object *obj = NULL;
|
|
|
|
objects_lookup(filp, &handle, 1, &obj);
|
|
return obj;
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_object_lookup);
|
|
|
|
/**
|
|
* drm_gem_dma_resv_wait - Wait on GEM object's reservation's objects
|
|
* shared and/or exclusive fences.
|
|
* @filep: DRM file private date
|
|
* @handle: userspace handle
|
|
* @wait_all: if true, wait on all fences, else wait on just exclusive fence
|
|
* @timeout: timeout value in jiffies or zero to return immediately
|
|
*
|
|
* Returns:
|
|
*
|
|
* Returns -ERESTARTSYS if interrupted, 0 if the wait timed out, or
|
|
* greater than 0 on success.
|
|
*/
|
|
long drm_gem_dma_resv_wait(struct drm_file *filep, u32 handle,
|
|
bool wait_all, unsigned long timeout)
|
|
{
|
|
long ret;
|
|
struct drm_gem_object *obj;
|
|
|
|
obj = drm_gem_object_lookup(filep, handle);
|
|
if (!obj) {
|
|
DRM_DEBUG("Failed to look up GEM BO %d\n", handle);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = dma_resv_wait_timeout(obj->resv, dma_resv_usage_rw(wait_all),
|
|
true, timeout);
|
|
if (ret == 0)
|
|
ret = -ETIME;
|
|
else if (ret > 0)
|
|
ret = 0;
|
|
|
|
drm_gem_object_put(obj);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_dma_resv_wait);
|
|
|
|
/**
|
|
* drm_gem_close_ioctl - implementation of the GEM_CLOSE ioctl
|
|
* @dev: drm_device
|
|
* @data: ioctl data
|
|
* @file_priv: drm file-private structure
|
|
*
|
|
* 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 (!drm_core_check_feature(dev, DRIVER_GEM))
|
|
return -EOPNOTSUPP;
|
|
|
|
ret = drm_gem_handle_delete(file_priv, args->handle);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* drm_gem_flink_ioctl - implementation of the GEM_FLINK ioctl
|
|
* @dev: drm_device
|
|
* @data: ioctl data
|
|
* @file_priv: drm file-private structure
|
|
*
|
|
* 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 (!drm_core_check_feature(dev, DRIVER_GEM))
|
|
return -EOPNOTSUPP;
|
|
|
|
obj = drm_gem_object_lookup(file_priv, args->handle);
|
|
if (obj == NULL)
|
|
return -ENOENT;
|
|
|
|
mutex_lock(&dev->object_name_lock);
|
|
/* 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_KERNEL);
|
|
if (ret < 0)
|
|
goto err;
|
|
|
|
obj->name = ret;
|
|
}
|
|
|
|
args->name = (uint64_t) obj->name;
|
|
ret = 0;
|
|
|
|
err:
|
|
mutex_unlock(&dev->object_name_lock);
|
|
drm_gem_object_put(obj);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* drm_gem_open_ioctl - implementation of the GEM_OPEN ioctl
|
|
* @dev: drm_device
|
|
* @data: ioctl data
|
|
* @file_priv: drm file-private structure
|
|
*
|
|
* 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 (!drm_core_check_feature(dev, DRIVER_GEM))
|
|
return -EOPNOTSUPP;
|
|
|
|
mutex_lock(&dev->object_name_lock);
|
|
obj = idr_find(&dev->object_name_idr, (int) args->name);
|
|
if (obj) {
|
|
drm_gem_object_get(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);
|
|
if (ret)
|
|
goto err;
|
|
|
|
args->handle = handle;
|
|
args->size = obj->size;
|
|
|
|
err:
|
|
drm_gem_object_put(obj);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* drm_gem_open - initializes GEM file-private structures at devnode open time
|
|
* @dev: drm_device which is being opened by userspace
|
|
* @file_private: drm file-private structure to set up
|
|
*
|
|
* 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_base(&file_private->object_idr, 1);
|
|
spin_lock_init(&file_private->table_lock);
|
|
}
|
|
|
|
/**
|
|
* drm_gem_release - release file-private GEM resources
|
|
* @dev: drm_device which is being closed by userspace
|
|
* @file_private: drm file-private structure to clean up
|
|
*
|
|
* 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);
|
|
}
|
|
|
|
/**
|
|
* drm_gem_object_release - release GEM buffer object resources
|
|
* @obj: GEM buffer object
|
|
*
|
|
* This releases any structures and resources used by @obj and is the inverse of
|
|
* drm_gem_object_init().
|
|
*/
|
|
void
|
|
drm_gem_object_release(struct drm_gem_object *obj)
|
|
{
|
|
if (obj->filp)
|
|
fput(obj->filp);
|
|
|
|
drm_gem_private_object_fini(obj);
|
|
|
|
drm_gem_free_mmap_offset(obj);
|
|
drm_gem_lru_remove(obj);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_object_release);
|
|
|
|
/**
|
|
* drm_gem_object_free - free a GEM object
|
|
* @kref: kref of the object to free
|
|
*
|
|
* Called after the last reference to the object has been lost.
|
|
*
|
|
* Frees the object
|
|
*/
|
|
void
|
|
drm_gem_object_free(struct kref *kref)
|
|
{
|
|
struct drm_gem_object *obj =
|
|
container_of(kref, struct drm_gem_object, refcount);
|
|
|
|
if (WARN_ON(!obj->funcs->free))
|
|
return;
|
|
|
|
obj->funcs->free(obj);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_object_free);
|
|
|
|
/**
|
|
* drm_gem_vm_open - vma->ops->open implementation for GEM
|
|
* @vma: VM area structure
|
|
*
|
|
* This function implements the #vm_operations_struct open() callback for GEM
|
|
* drivers. This must be used together with drm_gem_vm_close().
|
|
*/
|
|
void drm_gem_vm_open(struct vm_area_struct *vma)
|
|
{
|
|
struct drm_gem_object *obj = vma->vm_private_data;
|
|
|
|
drm_gem_object_get(obj);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_vm_open);
|
|
|
|
/**
|
|
* drm_gem_vm_close - vma->ops->close implementation for GEM
|
|
* @vma: VM area structure
|
|
*
|
|
* This function implements the #vm_operations_struct close() callback for GEM
|
|
* drivers. This must be used together with drm_gem_vm_open().
|
|
*/
|
|
void drm_gem_vm_close(struct vm_area_struct *vma)
|
|
{
|
|
struct drm_gem_object *obj = vma->vm_private_data;
|
|
|
|
drm_gem_object_put(obj);
|
|
}
|
|
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 object's
|
|
* vm_ops. Depending on their requirements, GEM objects can either
|
|
* provide a fault handler in their 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.
|
|
*
|
|
* Return 0 or success or -EINVAL if the object size is smaller than the VMA
|
|
* size, or if no vm_ops are provided.
|
|
*/
|
|
int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
int ret;
|
|
|
|
/* Check for valid size. */
|
|
if (obj_size < vma->vm_end - vma->vm_start)
|
|
return -EINVAL;
|
|
|
|
/* 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_get(obj);
|
|
|
|
vma->vm_private_data = obj;
|
|
vma->vm_ops = obj->funcs->vm_ops;
|
|
|
|
if (obj->funcs->mmap) {
|
|
ret = obj->funcs->mmap(obj, vma);
|
|
if (ret)
|
|
goto err_drm_gem_object_put;
|
|
WARN_ON(!(vma->vm_flags & VM_DONTEXPAND));
|
|
} else {
|
|
if (!vma->vm_ops) {
|
|
ret = -EINVAL;
|
|
goto err_drm_gem_object_put;
|
|
}
|
|
|
|
vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP;
|
|
vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
|
|
vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_drm_gem_object_put:
|
|
drm_gem_object_put(obj);
|
|
return ret;
|
|
}
|
|
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_object *obj = NULL;
|
|
struct drm_vma_offset_node *node;
|
|
int ret;
|
|
|
|
if (drm_dev_is_unplugged(dev))
|
|
return -ENODEV;
|
|
|
|
drm_vma_offset_lock_lookup(dev->vma_offset_manager);
|
|
node = drm_vma_offset_exact_lookup_locked(dev->vma_offset_manager,
|
|
vma->vm_pgoff,
|
|
vma_pages(vma));
|
|
if (likely(node)) {
|
|
obj = container_of(node, struct drm_gem_object, vma_node);
|
|
/*
|
|
* When the object is being freed, after it hits 0-refcnt it
|
|
* proceeds to tear down the object. In the process it will
|
|
* attempt to remove the VMA offset and so acquire this
|
|
* mgr->vm_lock. Therefore if we find an object with a 0-refcnt
|
|
* that matches our range, we know it is in the process of being
|
|
* destroyed and will be freed as soon as we release the lock -
|
|
* so we have to check for the 0-refcnted object and treat it as
|
|
* invalid.
|
|
*/
|
|
if (!kref_get_unless_zero(&obj->refcount))
|
|
obj = NULL;
|
|
}
|
|
drm_vma_offset_unlock_lookup(dev->vma_offset_manager);
|
|
|
|
if (!obj)
|
|
return -EINVAL;
|
|
|
|
if (!drm_vma_node_is_allowed(node, priv)) {
|
|
drm_gem_object_put(obj);
|
|
return -EACCES;
|
|
}
|
|
|
|
ret = drm_gem_mmap_obj(obj, drm_vma_node_size(node) << PAGE_SHIFT,
|
|
vma);
|
|
|
|
drm_gem_object_put(obj);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_mmap);
|
|
|
|
void drm_gem_print_info(struct drm_printer *p, unsigned int indent,
|
|
const struct drm_gem_object *obj)
|
|
{
|
|
drm_printf_indent(p, indent, "name=%d\n", obj->name);
|
|
drm_printf_indent(p, indent, "refcount=%u\n",
|
|
kref_read(&obj->refcount));
|
|
drm_printf_indent(p, indent, "start=%08lx\n",
|
|
drm_vma_node_start(&obj->vma_node));
|
|
drm_printf_indent(p, indent, "size=%zu\n", obj->size);
|
|
drm_printf_indent(p, indent, "imported=%s\n",
|
|
str_yes_no(obj->import_attach));
|
|
|
|
if (obj->funcs->print_info)
|
|
obj->funcs->print_info(p, indent, obj);
|
|
}
|
|
|
|
int drm_gem_pin(struct drm_gem_object *obj)
|
|
{
|
|
if (obj->funcs->pin)
|
|
return obj->funcs->pin(obj);
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
void drm_gem_unpin(struct drm_gem_object *obj)
|
|
{
|
|
if (obj->funcs->unpin)
|
|
obj->funcs->unpin(obj);
|
|
}
|
|
|
|
int drm_gem_vmap(struct drm_gem_object *obj, struct iosys_map *map)
|
|
{
|
|
int ret;
|
|
|
|
dma_resv_assert_held(obj->resv);
|
|
|
|
if (!obj->funcs->vmap)
|
|
return -EOPNOTSUPP;
|
|
|
|
ret = obj->funcs->vmap(obj, map);
|
|
if (ret)
|
|
return ret;
|
|
else if (iosys_map_is_null(map))
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_vmap);
|
|
|
|
void drm_gem_vunmap(struct drm_gem_object *obj, struct iosys_map *map)
|
|
{
|
|
dma_resv_assert_held(obj->resv);
|
|
|
|
if (iosys_map_is_null(map))
|
|
return;
|
|
|
|
if (obj->funcs->vunmap)
|
|
obj->funcs->vunmap(obj, map);
|
|
|
|
/* Always set the mapping to NULL. Callers may rely on this. */
|
|
iosys_map_clear(map);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_vunmap);
|
|
|
|
int drm_gem_vmap_unlocked(struct drm_gem_object *obj, struct iosys_map *map)
|
|
{
|
|
int ret;
|
|
|
|
dma_resv_lock(obj->resv, NULL);
|
|
ret = drm_gem_vmap(obj, map);
|
|
dma_resv_unlock(obj->resv);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_vmap_unlocked);
|
|
|
|
void drm_gem_vunmap_unlocked(struct drm_gem_object *obj, struct iosys_map *map)
|
|
{
|
|
dma_resv_lock(obj->resv, NULL);
|
|
drm_gem_vunmap(obj, map);
|
|
dma_resv_unlock(obj->resv);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_vunmap_unlocked);
|
|
|
|
/**
|
|
* drm_gem_lock_reservations - Sets up the ww context and acquires
|
|
* the lock on an array of GEM objects.
|
|
*
|
|
* Once you've locked your reservations, you'll want to set up space
|
|
* for your shared fences (if applicable), submit your job, then
|
|
* drm_gem_unlock_reservations().
|
|
*
|
|
* @objs: drm_gem_objects to lock
|
|
* @count: Number of objects in @objs
|
|
* @acquire_ctx: struct ww_acquire_ctx that will be initialized as
|
|
* part of tracking this set of locked reservations.
|
|
*/
|
|
int
|
|
drm_gem_lock_reservations(struct drm_gem_object **objs, int count,
|
|
struct ww_acquire_ctx *acquire_ctx)
|
|
{
|
|
int contended = -1;
|
|
int i, ret;
|
|
|
|
ww_acquire_init(acquire_ctx, &reservation_ww_class);
|
|
|
|
retry:
|
|
if (contended != -1) {
|
|
struct drm_gem_object *obj = objs[contended];
|
|
|
|
ret = dma_resv_lock_slow_interruptible(obj->resv,
|
|
acquire_ctx);
|
|
if (ret) {
|
|
ww_acquire_fini(acquire_ctx);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < count; i++) {
|
|
if (i == contended)
|
|
continue;
|
|
|
|
ret = dma_resv_lock_interruptible(objs[i]->resv,
|
|
acquire_ctx);
|
|
if (ret) {
|
|
int j;
|
|
|
|
for (j = 0; j < i; j++)
|
|
dma_resv_unlock(objs[j]->resv);
|
|
|
|
if (contended != -1 && contended >= i)
|
|
dma_resv_unlock(objs[contended]->resv);
|
|
|
|
if (ret == -EDEADLK) {
|
|
contended = i;
|
|
goto retry;
|
|
}
|
|
|
|
ww_acquire_fini(acquire_ctx);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
ww_acquire_done(acquire_ctx);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_lock_reservations);
|
|
|
|
void
|
|
drm_gem_unlock_reservations(struct drm_gem_object **objs, int count,
|
|
struct ww_acquire_ctx *acquire_ctx)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < count; i++)
|
|
dma_resv_unlock(objs[i]->resv);
|
|
|
|
ww_acquire_fini(acquire_ctx);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_unlock_reservations);
|
|
|
|
/**
|
|
* drm_gem_lru_init - initialize a LRU
|
|
*
|
|
* @lru: The LRU to initialize
|
|
* @lock: The lock protecting the LRU
|
|
*/
|
|
void
|
|
drm_gem_lru_init(struct drm_gem_lru *lru, struct mutex *lock)
|
|
{
|
|
lru->lock = lock;
|
|
lru->count = 0;
|
|
INIT_LIST_HEAD(&lru->list);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_lru_init);
|
|
|
|
static void
|
|
drm_gem_lru_remove_locked(struct drm_gem_object *obj)
|
|
{
|
|
obj->lru->count -= obj->size >> PAGE_SHIFT;
|
|
WARN_ON(obj->lru->count < 0);
|
|
list_del(&obj->lru_node);
|
|
obj->lru = NULL;
|
|
}
|
|
|
|
/**
|
|
* drm_gem_lru_remove - remove object from whatever LRU it is in
|
|
*
|
|
* If the object is currently in any LRU, remove it.
|
|
*
|
|
* @obj: The GEM object to remove from current LRU
|
|
*/
|
|
void
|
|
drm_gem_lru_remove(struct drm_gem_object *obj)
|
|
{
|
|
struct drm_gem_lru *lru = obj->lru;
|
|
|
|
if (!lru)
|
|
return;
|
|
|
|
mutex_lock(lru->lock);
|
|
drm_gem_lru_remove_locked(obj);
|
|
mutex_unlock(lru->lock);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_lru_remove);
|
|
|
|
static void
|
|
drm_gem_lru_move_tail_locked(struct drm_gem_lru *lru, struct drm_gem_object *obj)
|
|
{
|
|
lockdep_assert_held_once(lru->lock);
|
|
|
|
if (obj->lru)
|
|
drm_gem_lru_remove_locked(obj);
|
|
|
|
lru->count += obj->size >> PAGE_SHIFT;
|
|
list_add_tail(&obj->lru_node, &lru->list);
|
|
obj->lru = lru;
|
|
}
|
|
|
|
/**
|
|
* drm_gem_lru_move_tail - move the object to the tail of the LRU
|
|
*
|
|
* If the object is already in this LRU it will be moved to the
|
|
* tail. Otherwise it will be removed from whichever other LRU
|
|
* it is in (if any) and moved into this LRU.
|
|
*
|
|
* @lru: The LRU to move the object into.
|
|
* @obj: The GEM object to move into this LRU
|
|
*/
|
|
void
|
|
drm_gem_lru_move_tail(struct drm_gem_lru *lru, struct drm_gem_object *obj)
|
|
{
|
|
mutex_lock(lru->lock);
|
|
drm_gem_lru_move_tail_locked(lru, obj);
|
|
mutex_unlock(lru->lock);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_lru_move_tail);
|
|
|
|
/**
|
|
* drm_gem_lru_scan - helper to implement shrinker.scan_objects
|
|
*
|
|
* If the shrink callback succeeds, it is expected that the driver
|
|
* move the object out of this LRU.
|
|
*
|
|
* If the LRU possibly contain active buffers, it is the responsibility
|
|
* of the shrink callback to check for this (ie. dma_resv_test_signaled())
|
|
* or if necessary block until the buffer becomes idle.
|
|
*
|
|
* @lru: The LRU to scan
|
|
* @nr_to_scan: The number of pages to try to reclaim
|
|
* @shrink: Callback to try to shrink/reclaim the object.
|
|
*/
|
|
unsigned long
|
|
drm_gem_lru_scan(struct drm_gem_lru *lru, unsigned nr_to_scan,
|
|
bool (*shrink)(struct drm_gem_object *obj))
|
|
{
|
|
struct drm_gem_lru still_in_lru;
|
|
struct drm_gem_object *obj;
|
|
unsigned freed = 0;
|
|
|
|
drm_gem_lru_init(&still_in_lru, lru->lock);
|
|
|
|
mutex_lock(lru->lock);
|
|
|
|
while (freed < nr_to_scan) {
|
|
obj = list_first_entry_or_null(&lru->list, typeof(*obj), lru_node);
|
|
|
|
if (!obj)
|
|
break;
|
|
|
|
drm_gem_lru_move_tail_locked(&still_in_lru, obj);
|
|
|
|
/*
|
|
* If it's in the process of being freed, gem_object->free()
|
|
* may be blocked on lock waiting to remove it. So just
|
|
* skip it.
|
|
*/
|
|
if (!kref_get_unless_zero(&obj->refcount))
|
|
continue;
|
|
|
|
/*
|
|
* Now that we own a reference, we can drop the lock for the
|
|
* rest of the loop body, to reduce contention with other
|
|
* code paths that need the LRU lock
|
|
*/
|
|
mutex_unlock(lru->lock);
|
|
|
|
/*
|
|
* Note that this still needs to be trylock, since we can
|
|
* hit shrinker in response to trying to get backing pages
|
|
* for this obj (ie. while it's lock is already held)
|
|
*/
|
|
if (!dma_resv_trylock(obj->resv))
|
|
goto tail;
|
|
|
|
if (shrink(obj)) {
|
|
freed += obj->size >> PAGE_SHIFT;
|
|
|
|
/*
|
|
* If we succeeded in releasing the object's backing
|
|
* pages, we expect the driver to have moved the object
|
|
* out of this LRU
|
|
*/
|
|
WARN_ON(obj->lru == &still_in_lru);
|
|
WARN_ON(obj->lru == lru);
|
|
}
|
|
|
|
dma_resv_unlock(obj->resv);
|
|
|
|
tail:
|
|
drm_gem_object_put(obj);
|
|
mutex_lock(lru->lock);
|
|
}
|
|
|
|
/*
|
|
* Move objects we've skipped over out of the temporary still_in_lru
|
|
* back into this LRU
|
|
*/
|
|
list_for_each_entry (obj, &still_in_lru.list, lru_node)
|
|
obj->lru = lru;
|
|
list_splice_tail(&still_in_lru.list, &lru->list);
|
|
lru->count += still_in_lru.count;
|
|
|
|
mutex_unlock(lru->lock);
|
|
|
|
return freed;
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_lru_scan);
|