drm_gem_vm.c revision 1.3
1 1.3 riastrad /* $NetBSD: drm_gem_vm.c,v 1.3 2014/05/01 15:19:16 riastradh 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 1.3 riastrad __KERNEL_RCSID(0, "$NetBSD: drm_gem_vm.c,v 1.3 2014/05/01 15:19:16 riastradh 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 riastrad 41 1.2 riastrad static int drm_gem_mmap_object_locked(struct drm_device *, off_t, size_t, 42 1.3 riastrad int, struct uvm_object **, voff_t *); 43 1.2 riastrad 44 1.2 riastrad void 45 1.2 riastrad drm_gem_pager_reference(struct uvm_object *uobj) 46 1.2 riastrad { 47 1.2 riastrad struct drm_gem_object *const obj = container_of(uobj, 48 1.2 riastrad struct drm_gem_object, gemo_uvmobj); 49 1.2 riastrad 50 1.2 riastrad drm_gem_object_reference(obj); 51 1.2 riastrad } 52 1.2 riastrad 53 1.2 riastrad void 54 1.2 riastrad drm_gem_pager_detach(struct uvm_object *uobj) 55 1.2 riastrad { 56 1.2 riastrad struct drm_gem_object *const obj = container_of(uobj, 57 1.2 riastrad struct drm_gem_object, gemo_uvmobj); 58 1.2 riastrad 59 1.2 riastrad drm_gem_object_unreference_unlocked(obj); 60 1.2 riastrad } 61 1.2 riastrad 62 1.2 riastrad int 63 1.2 riastrad drm_gem_mmap_object(struct drm_device *dev, off_t byte_offset, size_t nbytes, 64 1.3 riastrad int prot, struct uvm_object **uobjp, voff_t *uoffsetp) 65 1.2 riastrad { 66 1.2 riastrad int ret; 67 1.2 riastrad 68 1.2 riastrad mutex_lock(&dev->struct_mutex); 69 1.2 riastrad ret = drm_gem_mmap_object_locked(dev, byte_offset, nbytes, prot, 70 1.3 riastrad uobjp, uoffsetp); 71 1.2 riastrad mutex_unlock(&dev->struct_mutex); 72 1.2 riastrad 73 1.2 riastrad return ret; 74 1.2 riastrad } 75 1.2 riastrad 76 1.2 riastrad static int 77 1.2 riastrad drm_gem_mmap_object_locked(struct drm_device *dev, off_t byte_offset, 78 1.3 riastrad size_t nbytes, int prot __unused, struct uvm_object **uobjp, 79 1.3 riastrad voff_t *uoffsetp) 80 1.2 riastrad { 81 1.2 riastrad struct drm_gem_mm *const mm = dev->mm_private; 82 1.2 riastrad const off_t page_offset = (byte_offset >> PAGE_SHIFT); 83 1.2 riastrad struct drm_hash_item *hash; 84 1.2 riastrad 85 1.2 riastrad KASSERT(mutex_is_locked(&dev->struct_mutex)); 86 1.2 riastrad KASSERT(drm_core_check_feature(dev, DRIVER_GEM)); 87 1.2 riastrad KASSERT(dev->driver->gem_uvm_ops != NULL); 88 1.2 riastrad KASSERT(prot == (prot & (PROT_READ | PROT_WRITE))); 89 1.3 riastrad KASSERT(byte_offset == (byte_offset & ~(PAGE_SIZE-1))); 90 1.2 riastrad 91 1.2 riastrad if (drm_ht_find_item(&mm->offset_hash, page_offset, &hash) != 0) { 92 1.2 riastrad /* Fall back to vanilla device mappings. */ 93 1.2 riastrad *uobjp = NULL; 94 1.3 riastrad *uoffsetp = (voff_t)-1; 95 1.2 riastrad return 0; 96 1.2 riastrad } 97 1.2 riastrad 98 1.2 riastrad struct drm_local_map *const map = drm_hash_entry(hash, 99 1.2 riastrad struct drm_map_list, hash)->map; 100 1.2 riastrad 101 1.2 riastrad if (map == NULL) /* XXX How can this happen? */ 102 1.2 riastrad return -EINVAL; 103 1.2 riastrad if (map->size < nbytes) 104 1.2 riastrad return -EOVERFLOW; 105 1.2 riastrad 106 1.2 riastrad struct drm_gem_object *const obj = map->handle; 107 1.2 riastrad KASSERT(obj->dev == dev); 108 1.2 riastrad 109 1.2 riastrad /* Success! */ 110 1.2 riastrad drm_gem_object_reference(obj); 111 1.2 riastrad *uobjp = &obj->gemo_uvmobj; 112 1.3 riastrad *uoffsetp = 0; 113 1.2 riastrad return 0; 114 1.2 riastrad } 115
Indexes created Tue Sep 23 13:09:54 GMT 2025