drm_gem_vm.c revision 1.2.2.1
1 1.2.2.1 tls /* $NetBSD: drm_gem_vm.c,v 1.2.2.1 2014/08/10 06:55:39 tls Exp $ */ 2 1.2 riastrad 3 1.2 riastrad /*- 4 1.2 riastrad * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 1.2 riastrad * All rights reserved. 6 1.2 riastrad * 7 1.2 riastrad * This code is derived from software contributed to The NetBSD Foundation 8 1.2 riastrad * by Taylor R. Campbell. 9 1.2 riastrad * 10 1.2 riastrad * Redistribution and use in source and binary forms, with or without 11 1.2 riastrad * modification, are permitted provided that the following conditions 12 1.2 riastrad * are met: 13 1.2 riastrad * 1. Redistributions of source code must retain the above copyright 14 1.2 riastrad * notice, this list of conditions and the following disclaimer. 15 1.2 riastrad * 2. Redistributions in binary form must reproduce the above copyright 16 1.2 riastrad * notice, this list of conditions and the following disclaimer in the 17 1.2 riastrad * documentation and/or other materials provided with the distribution. 18 1.2 riastrad * 19 1.2 riastrad * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.2 riastrad * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.2 riastrad * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.2 riastrad * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.2 riastrad * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.2 riastrad * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.2 riastrad * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.2 riastrad * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.2 riastrad * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.2 riastrad * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.2 riastrad * POSSIBILITY OF SUCH DAMAGE. 30 1.2 riastrad */ 31 1.2 riastrad 32 1.2 riastrad #include <sys/cdefs.h> 33 1.2.2.1 tls __KERNEL_RCSID(0, "$NetBSD: drm_gem_vm.c,v 1.2.2.1 2014/08/10 06:55:39 tls Exp $"); 34 1.2 riastrad 35 1.2 riastrad #include <sys/types.h> 36 1.2 riastrad 37 1.2 riastrad #include <uvm/uvm_extern.h> 38 1.2 riastrad 39 1.2 riastrad #include <drm/drmP.h> 40 1.2.2.1 tls #include <drm/drm_vma_manager.h> 41 1.2 riastrad 42 1.2 riastrad static int drm_gem_mmap_object_locked(struct drm_device *, off_t, size_t, 43 1.2.2.1 tls int, struct uvm_object **, voff_t *, struct file *); 44 1.2 riastrad 45 1.2 riastrad void 46 1.2 riastrad drm_gem_pager_reference(struct uvm_object *uobj) 47 1.2 riastrad { 48 1.2 riastrad struct drm_gem_object *const obj = container_of(uobj, 49 1.2 riastrad struct drm_gem_object, gemo_uvmobj); 50 1.2 riastrad 51 1.2 riastrad drm_gem_object_reference(obj); 52 1.2 riastrad } 53 1.2 riastrad 54 1.2 riastrad void 55 1.2 riastrad drm_gem_pager_detach(struct uvm_object *uobj) 56 1.2 riastrad { 57 1.2 riastrad struct drm_gem_object *const obj = container_of(uobj, 58 1.2 riastrad struct drm_gem_object, gemo_uvmobj); 59 1.2 riastrad 60 1.2 riastrad drm_gem_object_unreference_unlocked(obj); 61 1.2 riastrad } 62 1.2 riastrad 63 1.2 riastrad int 64 1.2.2.1 tls drm_gem_or_legacy_mmap_object(struct drm_device *dev, off_t byte_offset, 65 1.2.2.1 tls size_t nbytes, int prot, struct uvm_object **uobjp, voff_t *uoffsetp, 66 1.2.2.1 tls struct file *file) 67 1.2.2.1 tls { 68 1.2.2.1 tls int ret; 69 1.2.2.1 tls 70 1.2.2.1 tls ret = drm_gem_mmap_object(dev, byte_offset, nbytes, prot, uobjp, 71 1.2.2.1 tls uoffsetp, file); 72 1.2.2.1 tls if (ret) 73 1.2.2.1 tls return ret; 74 1.2.2.1 tls if (*uobjp != NULL) 75 1.2.2.1 tls return 0; 76 1.2.2.1 tls 77 1.2.2.1 tls return drm_mmap_object(dev, byte_offset, nbytes, prot, uobjp, 78 1.2.2.1 tls uoffsetp, file); 79 1.2.2.1 tls } 80 1.2.2.1 tls 81 1.2.2.1 tls int 82 1.2 riastrad drm_gem_mmap_object(struct drm_device *dev, off_t byte_offset, size_t nbytes, 83 1.2.2.1 tls int prot, struct uvm_object **uobjp, voff_t *uoffsetp, struct file *file) 84 1.2 riastrad { 85 1.2 riastrad int ret; 86 1.2 riastrad 87 1.2 riastrad mutex_lock(&dev->struct_mutex); 88 1.2 riastrad ret = drm_gem_mmap_object_locked(dev, byte_offset, nbytes, prot, 89 1.2.2.1 tls uobjp, uoffsetp, file); 90 1.2 riastrad mutex_unlock(&dev->struct_mutex); 91 1.2 riastrad 92 1.2 riastrad return ret; 93 1.2 riastrad } 94 1.2 riastrad 95 1.2 riastrad static int 96 1.2 riastrad drm_gem_mmap_object_locked(struct drm_device *dev, off_t byte_offset, 97 1.2.2.1 tls size_t nbytes, int prot __unused, struct uvm_object **uobjp, 98 1.2.2.1 tls voff_t *uoffsetp, struct file *file __unused) 99 1.2 riastrad { 100 1.2.2.1 tls const unsigned long startpage = (byte_offset >> PAGE_SHIFT); 101 1.2.2.1 tls const unsigned long npages = (nbytes >> PAGE_SHIFT); 102 1.2 riastrad 103 1.2 riastrad KASSERT(mutex_is_locked(&dev->struct_mutex)); 104 1.2 riastrad KASSERT(drm_core_check_feature(dev, DRIVER_GEM)); 105 1.2 riastrad KASSERT(dev->driver->gem_uvm_ops != NULL); 106 1.2 riastrad KASSERT(prot == (prot & (PROT_READ | PROT_WRITE))); 107 1.2.2.1 tls KASSERT(0 <= byte_offset); 108 1.2.2.1 tls KASSERT(byte_offset == (byte_offset & ~(PAGE_SIZE-1))); 109 1.2.2.1 tls KASSERT(nbytes == (npages << PAGE_SHIFT)); 110 1.2.2.1 tls 111 1.2.2.1 tls struct drm_vma_offset_node *const node = 112 1.2.2.1 tls drm_vma_offset_exact_lookup(dev->vma_offset_manager, startpage, 113 1.2.2.1 tls npages); 114 1.2.2.1 tls if (node == NULL) { 115 1.2 riastrad /* Fall back to vanilla device mappings. */ 116 1.2 riastrad *uobjp = NULL; 117 1.2.2.1 tls *uoffsetp = (voff_t)-1; 118 1.2 riastrad return 0; 119 1.2 riastrad } 120 1.2 riastrad 121 1.2.2.1 tls struct drm_gem_object *const obj = container_of(node, 122 1.2.2.1 tls struct drm_gem_object, vma_node); 123 1.2 riastrad KASSERT(obj->dev == dev); 124 1.2 riastrad 125 1.2 riastrad /* Success! */ 126 1.2 riastrad drm_gem_object_reference(obj); 127 1.2 riastrad *uobjp = &obj->gemo_uvmobj; 128 1.2.2.1 tls *uoffsetp = 0; 129 1.2 riastrad return 0; 130 1.2 riastrad } 131
Indexes created Wed Oct 22 06:10:02 GMT 2025