4 * Copyright (c) 2011, Intel Corporation.
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
22 * - we don't actually put GEM objects into the GART yet
23 * - we need to work out if the MMU is relevant as well (eg for
24 * accelerated operations on a GEM object)
27 * ie this is just an initial framework to get us going.
35 int psb_gem_init_object(struct drm_gem_object *obj)
40 void psb_gem_free_object(struct drm_gem_object *obj)
42 struct gtt_range *gtt = container_of(obj, struct gtt_range, gem);
43 if (obj->map_list.map) {
44 /* Do things GEM should do for us */
45 struct drm_gem_mm *mm = obj->dev->mm_private;
46 struct drm_map_list *list = &obj->map_list;
47 drm_ht_remove_item(&mm->offset_hash, &list->hash);
48 drm_mm_put_block(list->file_offset_node);
52 drm_gem_object_release_wrap(obj);
53 /* This must occur last as it frees up the memory of the GEM object */
54 psb_gtt_free_range(obj->dev, gtt);
57 int psb_gem_get_aperture(struct drm_device *dev, void *data,
58 struct drm_file *file)
64 * psb_gem_dumb_map_gtt - buffer mapping for dumb interface
65 * @file: our drm client file
67 * @handle: GEM handle to the object (from dumb_create)
69 * Do the necessary setup to allow the mapping of the frame buffer
70 * into user memory. We don't have to do much here at the moment.
72 int psb_gem_dumb_map_gtt(struct drm_file *file, struct drm_device *dev,
73 uint32_t handle, uint64_t *offset)
76 struct drm_gem_object *obj;
78 if (!(dev->driver->driver_features & DRIVER_GEM))
81 mutex_lock(&dev->struct_mutex);
83 /* GEM does all our handle to object mapping */
84 obj = drm_gem_object_lookup(dev, file, handle);
89 /* What validation is needed here ? */
91 /* Make it mmapable */
92 if (!obj->map_list.map) {
93 ret = gem_create_mmap_offset(obj);
97 /* GEM should really work out the hash offsets for us */
98 *offset = (u64)obj->map_list.hash.key << PAGE_SHIFT;
100 drm_gem_object_unreference(obj);
102 mutex_unlock(&dev->struct_mutex);
107 * psb_gem_create - create a mappable object
108 * @file: the DRM file of the client
110 * @size: the size requested
111 * @handlep: returned handle (opaque number)
113 * Create a GEM object, fill in the boilerplate and attach a handle to
114 * it so that userspace can speak about it. This does the core work
115 * for the various methods that do/will create GEM objects for things
117 static int psb_gem_create(struct drm_file *file,
118 struct drm_device *dev, uint64_t size, uint32_t *handlep)
124 size = roundup(size, PAGE_SIZE);
126 /* Allocate our object - for now a direct gtt range which is not
127 stolen memory backed */
128 r = psb_gtt_alloc_range(dev, size, "gem", 0);
130 dev_err(dev->dev, "no memory for %lld byte GEM object\n", size);
133 /* Initialize the extra goodies GEM needs to do all the hard work */
134 if (drm_gem_object_init(dev, &r->gem, size) != 0) {
135 psb_gtt_free_range(dev, r);
136 /* GEM doesn't give an error code and we don't have an
137 EGEMSUCKS so make something up for now - FIXME */
138 dev_err(dev->dev, "GEM init failed for %lld\n", size);
141 /* Give the object a handle so we can carry it more easily */
142 ret = drm_gem_handle_create(file, &r->gem, &handle);
144 dev_err(dev->dev, "GEM handle failed for %p, %lld\n",
146 drm_gem_object_release(&r->gem);
147 psb_gtt_free_range(dev, r);
150 /* We have the initial and handle reference but need only one now */
151 drm_gem_object_unreference(&r->gem);
157 * psb_gem_dumb_create - create a dumb buffer
158 * @drm_file: our client file
160 * @args: the requested arguments copied from userspace
162 * Allocate a buffer suitable for use for a frame buffer of the
163 * form described by user space. Give userspace a handle by which
166 int psb_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
167 struct drm_mode_create_dumb *args)
169 args->pitch = ALIGN(args->width * ((args->bpp + 7) / 8), 64);
170 args->size = args->pitch * args->height;
171 return psb_gem_create(file, dev, args->size, &args->handle);
175 * psb_gem_dumb_destroy - destroy a dumb buffer
177 * @dev: our DRM device
178 * @handle: the object handle
180 * Destroy a handle that was created via psb_gem_dumb_create, at least
181 * we hope it was created that way. i915 seems to assume the caller
182 * does the checking but that might be worth review ! FIXME
184 int psb_gem_dumb_destroy(struct drm_file *file, struct drm_device *dev,
187 /* No special work needed, drop the reference and see what falls out */
188 return drm_gem_handle_delete(file, handle);
192 * psb_gem_fault - pagefault handler for GEM objects
193 * @vma: the VMA of the GEM object
196 * Invoked when a fault occurs on an mmap of a GEM managed area. GEM
197 * does most of the work for us including the actual map/unmap calls
198 * but we need to do the actual page work.
200 * This code eventually needs to handle faulting objects in and out
201 * of the GTT and repacking it when we run out of space. We can put
202 * that off for now and for our simple uses
204 * The VMA was set up by GEM. In doing so it also ensured that the
205 * vma->vm_private_data points to the GEM object that is backing this
210 int psb_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
212 struct drm_gem_object *obj;
217 struct drm_device *dev;
218 struct drm_psb_private *dev_priv;
220 obj = vma->vm_private_data; /* GEM object */
222 dev_priv = dev->dev_private;
224 r = container_of(obj, struct gtt_range, gem); /* Get the gtt range */
226 /* Make sure we don't parallel update on a fault, nor move or remove
227 something from beneath our feet */
228 mutex_lock(&dev->struct_mutex);
230 /* For now the mmap pins the object and it stays pinned. As things
231 stand that will do us no harm */
232 if (r->mmapping == 0) {
233 ret = psb_gtt_pin(r);
235 dev_err(dev->dev, "gma500: pin failed: %d\n", ret);
241 /* Page relative to the VMA start - we must calculate this ourselves
242 because vmf->pgoff is the fake GEM offset */
243 page_offset = ((unsigned long) vmf->virtual_address - vma->vm_start)
246 /* CPU view of the page, don't go via the GART for CPU writes */
248 pfn = (dev_priv->stolen_base + r->offset) >> PAGE_SHIFT;
250 pfn = page_to_pfn(r->pages[page_offset]);
251 ret = vm_insert_pfn(vma, (unsigned long)vmf->virtual_address, pfn);
254 mutex_unlock(&dev->struct_mutex);
259 return VM_FAULT_NOPAGE;
263 return VM_FAULT_SIGBUS;