496 lines
12 KiB
C
496 lines
12 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2011 The FreeBSD Foundation
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*
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* This software was developed by Konstantin Belousov under sponsorship from
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* the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include "opt_vm.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/limits.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <vm/vm.h>
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#include <vm/vm_page.h>
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#include <dev/drm2/drmP.h>
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#include <dev/drm2/drm.h>
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#include <dev/drm2/drm_sarea.h>
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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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drm_gem_names_init(&dev->object_names);
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mm = malloc(sizeof(*mm), DRM_MEM_DRIVER, M_NOWAIT);
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if (!mm) {
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DRM_ERROR("out of memory\n");
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return -ENOMEM;
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}
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dev->mm_private = mm;
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if (drm_ht_create(&mm->offset_hash, 19)) {
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free(mm, DRM_MEM_DRIVER);
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return -ENOMEM;
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}
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mm->idxunr = new_unrhdr(0, DRM_GEM_MAX_IDX, NULL);
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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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dev->mm_private = NULL;
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drm_ht_remove(&mm->offset_hash);
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delete_unrhdr(mm->idxunr);
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free(mm, DRM_MEM_DRIVER);
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drm_gem_names_fini(&dev->object_names);
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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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KASSERT((size & (PAGE_SIZE - 1)) == 0,
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("Bad size %ju", (uintmax_t)size));
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obj->dev = dev;
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obj->vm_obj = vm_pager_allocate(OBJT_SWAP, NULL, size,
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VM_PROT_READ | VM_PROT_WRITE, 0, curthread->td_ucred);
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obj->refcount = 1;
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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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MPASS((size & (PAGE_SIZE - 1)) == 0);
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obj->dev = dev;
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obj->vm_obj = NULL;
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obj->refcount = 1;
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atomic_store_rel_int(&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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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 = malloc(sizeof(*obj), DRM_MEM_DRIVER, M_NOWAIT | M_ZERO);
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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 dealloc;
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}
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return obj;
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dealloc:
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vm_object_deallocate(obj->vm_obj);
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free:
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free(obj, DRM_MEM_DRIVER);
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return NULL;
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}
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EXPORT_SYMBOL(drm_gem_object_alloc);
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#if defined(FREEBSD_NOTYET)
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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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#endif
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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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obj = drm_gem_names_remove(&filp->object_names, handle);
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if (obj == NULL) {
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return -EINVAL;
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}
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dev = obj->dev;
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#if defined(FREEBSD_NOTYET)
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drm_gem_remove_prime_handles(obj, filp);
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#endif
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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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*handlep = 0;
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ret = drm_gem_name_create(&file_priv->object_names, obj, handlep);
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if (ret != 0)
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return ret;
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drm_gem_object_handle_reference(obj);
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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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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_hash_item *list = &obj->map_list;
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if (!obj->on_map)
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return;
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drm_ht_remove_item(&mm->offset_hash, list);
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free_unr(mm->idxunr, list->key);
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obj->on_map = false;
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}
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EXPORT_SYMBOL(drm_gem_free_mmap_offset);
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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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int ret;
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if (obj->on_map)
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return 0;
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obj->map_list.key = alloc_unr(mm->idxunr);
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ret = drm_ht_insert_item(&mm->offset_hash, &obj->map_list);
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if (ret) {
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DRM_ERROR("failed to add to map hash\n");
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free_unr(mm->idxunr, obj->map_list.key);
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return ret;
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}
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obj->on_map = true;
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return 0;
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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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obj = drm_gem_name_ref(&filp->object_names, handle,
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(void (*)(void *))drm_gem_object_reference);
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return obj;
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}
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EXPORT_SYMBOL(drm_gem_object_lookup);
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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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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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ret = drm_gem_name_create(&dev->object_names, obj, &obj->name);
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if (ret != 0) {
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if (ret == -EALREADY)
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ret = 0;
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drm_gem_object_unreference_unlocked(obj);
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}
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if (ret == 0)
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args->name = obj->name;
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return ret;
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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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obj = drm_gem_name_ref(&dev->object_names, args->name,
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(void (*)(void *))drm_gem_object_reference);
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if (!obj)
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return -ENOENT;
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ret = drm_gem_handle_create(file_priv, obj, &handle);
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drm_gem_object_unreference_unlocked(obj);
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if (ret)
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return ret;
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args->handle = handle;
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args->size = obj->size;
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return 0;
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}
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void
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drm_gem_open(struct drm_device *dev, struct drm_file *file_private)
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{
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drm_gem_names_init(&file_private->object_names);
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}
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static int
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drm_gem_object_release_handle(uint32_t name, 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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struct drm_device *dev = obj->dev;
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#if defined(FREEBSD_NOTYET)
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drm_gem_remove_prime_handles(obj, file_priv);
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#endif
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if (dev->driver->gem_close_object)
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dev->driver->gem_close_object(obj, file_priv);
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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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void
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drm_gem_release(struct drm_device *dev, struct drm_file *file_private)
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{
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drm_gem_names_foreach(&file_private->object_names,
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drm_gem_object_release_handle, file_private);
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drm_gem_names_fini(&file_private->object_names);
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}
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void
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drm_gem_object_release(struct drm_gem_object *obj)
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{
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/*
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* obj->vm_obj can be NULL for private gem objects.
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*/
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vm_object_deallocate(obj->vm_obj);
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}
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EXPORT_SYMBOL(drm_gem_object_release);
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void
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drm_gem_object_free(struct drm_gem_object *obj)
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{
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struct drm_device *dev = obj->dev;
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DRM_LOCK_ASSERT(dev);
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if (dev->driver->gem_free_object != NULL)
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dev->driver->gem_free_object(obj);
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}
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EXPORT_SYMBOL(drm_gem_object_free);
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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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struct drm_gem_object *obj1;
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if (obj->name) {
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obj1 = drm_gem_names_remove(&dev->object_names, obj->name);
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obj->name = 0;
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drm_gem_object_unreference(obj1);
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}
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}
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static struct drm_gem_object *
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drm_gem_object_from_offset(struct drm_device *dev, vm_ooffset_t offset)
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{
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struct drm_gem_object *obj;
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struct drm_gem_mm *mm;
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struct drm_hash_item *map_list;
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if ((offset & DRM_GEM_MAPPING_MASK) != DRM_GEM_MAPPING_KEY)
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return (NULL);
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offset &= ~DRM_GEM_MAPPING_KEY;
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mm = dev->mm_private;
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if (drm_ht_find_item(&mm->offset_hash, DRM_GEM_MAPPING_IDX(offset),
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&map_list) != 0) {
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DRM_DEBUG("drm_gem_object_from_offset: offset 0x%jx obj not found\n",
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(uintmax_t)offset);
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return (NULL);
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}
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obj = __containerof(map_list, struct drm_gem_object, map_list);
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return (obj);
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}
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int
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drm_gem_mmap_single(struct drm_device *dev, vm_ooffset_t *offset, vm_size_t size,
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struct vm_object **obj_res, int nprot)
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{
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struct drm_gem_object *gem_obj;
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struct vm_object *vm_obj;
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DRM_LOCK(dev);
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gem_obj = drm_gem_object_from_offset(dev, *offset);
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if (gem_obj == NULL) {
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DRM_UNLOCK(dev);
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return (-ENODEV);
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}
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drm_gem_object_reference(gem_obj);
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DRM_UNLOCK(dev);
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vm_obj = cdev_pager_allocate(gem_obj, OBJT_MGTDEVICE,
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dev->driver->gem_pager_ops, size, nprot,
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DRM_GEM_MAPPING_MAPOFF(*offset), curthread->td_ucred);
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if (vm_obj == NULL) {
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drm_gem_object_unreference_unlocked(gem_obj);
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return (-EINVAL);
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}
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*offset = DRM_GEM_MAPPING_MAPOFF(*offset);
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*obj_res = vm_obj;
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return (0);
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}
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void
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drm_gem_pager_dtr(void *handle)
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{
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struct drm_gem_object *obj;
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struct drm_device *dev;
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obj = handle;
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dev = obj->dev;
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DRM_LOCK(dev);
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drm_gem_free_mmap_offset(obj);
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drm_gem_object_unreference(obj);
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DRM_UNLOCK(dev);
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}
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