1 /*
2 * psb GEM interface
3 *
4 * Copyright (c) 2011, Intel Corporation.
5 *
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.
9 *
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
13 * more details.
14 *
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.
18 *
19 * Authors: Alan Cox
20 *
21 * TODO:
22 * - we need to work out if the MMU is relevant (eg for
23 * accelerated operations on a GEM object)
24 */
25
26 #include <drm/drmP.h>
27 #include <drm/drm.h>
28 #include <drm/gma_drm.h>
29 #include "psb_drv.h"
30
psb_gem_init_object(struct drm_gem_object * obj)31 int psb_gem_init_object(struct drm_gem_object *obj)
32 {
33 return -EINVAL;
34 }
35
psb_gem_free_object(struct drm_gem_object * obj)36 void psb_gem_free_object(struct drm_gem_object *obj)
37 {
38 struct gtt_range *gtt = container_of(obj, struct gtt_range, gem);
39
40 /* Remove the list map if one is present */
41 if (obj->map_list.map)
42 drm_gem_free_mmap_offset(obj);
43 drm_gem_object_release(obj);
44
45 /* This must occur last as it frees up the memory of the GEM object */
46 psb_gtt_free_range(obj->dev, gtt);
47 }
48
psb_gem_get_aperture(struct drm_device * dev,void * data,struct drm_file * file)49 int psb_gem_get_aperture(struct drm_device *dev, void *data,
50 struct drm_file *file)
51 {
52 return -EINVAL;
53 }
54
55 /**
56 * psb_gem_dumb_map_gtt - buffer mapping for dumb interface
57 * @file: our drm client file
58 * @dev: drm device
59 * @handle: GEM handle to the object (from dumb_create)
60 *
61 * Do the necessary setup to allow the mapping of the frame buffer
62 * into user memory. We don't have to do much here at the moment.
63 */
psb_gem_dumb_map_gtt(struct drm_file * file,struct drm_device * dev,uint32_t handle,uint64_t * offset)64 int psb_gem_dumb_map_gtt(struct drm_file *file, struct drm_device *dev,
65 uint32_t handle, uint64_t *offset)
66 {
67 int ret = 0;
68 struct drm_gem_object *obj;
69
70 if (!(dev->driver->driver_features & DRIVER_GEM))
71 return -ENODEV;
72
73 mutex_lock(&dev->struct_mutex);
74
75 /* GEM does all our handle to object mapping */
76 obj = drm_gem_object_lookup(dev, file, handle);
77 if (obj == NULL) {
78 ret = -ENOENT;
79 goto unlock;
80 }
81 /* What validation is needed here ? */
82
83 /* Make it mmapable */
84 if (!obj->map_list.map) {
85 ret = drm_gem_create_mmap_offset(obj);
86 if (ret)
87 goto out;
88 }
89 /* GEM should really work out the hash offsets for us */
90 *offset = (u64)obj->map_list.hash.key << PAGE_SHIFT;
91 out:
92 drm_gem_object_unreference(obj);
93 unlock:
94 mutex_unlock(&dev->struct_mutex);
95 return ret;
96 }
97
98 /**
99 * psb_gem_create - create a mappable object
100 * @file: the DRM file of the client
101 * @dev: our device
102 * @size: the size requested
103 * @handlep: returned handle (opaque number)
104 *
105 * Create a GEM object, fill in the boilerplate and attach a handle to
106 * it so that userspace can speak about it. This does the core work
107 * for the various methods that do/will create GEM objects for things
108 */
psb_gem_create(struct drm_file * file,struct drm_device * dev,uint64_t size,uint32_t * handlep)109 static int psb_gem_create(struct drm_file *file,
110 struct drm_device *dev, uint64_t size, uint32_t *handlep)
111 {
112 struct gtt_range *r;
113 int ret;
114 u32 handle;
115
116 size = roundup(size, PAGE_SIZE);
117
118 /* Allocate our object - for now a direct gtt range which is not
119 stolen memory backed */
120 r = psb_gtt_alloc_range(dev, size, "gem", 0);
121 if (r == NULL) {
122 dev_err(dev->dev, "no memory for %lld byte GEM object\n", size);
123 return -ENOSPC;
124 }
125 /* Initialize the extra goodies GEM needs to do all the hard work */
126 if (drm_gem_object_init(dev, &r->gem, size) != 0) {
127 psb_gtt_free_range(dev, r);
128 /* GEM doesn't give an error code so use -ENOMEM */
129 dev_err(dev->dev, "GEM init failed for %lld\n", size);
130 return -ENOMEM;
131 }
132 /* Limit the object to 32bit mappings */
133 mapping_set_gfp_mask(r->gem.filp->f_mapping, GFP_KERNEL | __GFP_DMA32);
134 /* Give the object a handle so we can carry it more easily */
135 ret = drm_gem_handle_create(file, &r->gem, &handle);
136 if (ret) {
137 dev_err(dev->dev, "GEM handle failed for %p, %lld\n",
138 &r->gem, size);
139 drm_gem_object_release(&r->gem);
140 psb_gtt_free_range(dev, r);
141 return ret;
142 }
143 /* We have the initial and handle reference but need only one now */
144 drm_gem_object_unreference(&r->gem);
145 *handlep = handle;
146 return 0;
147 }
148
149 /**
150 * psb_gem_dumb_create - create a dumb buffer
151 * @drm_file: our client file
152 * @dev: our device
153 * @args: the requested arguments copied from userspace
154 *
155 * Allocate a buffer suitable for use for a frame buffer of the
156 * form described by user space. Give userspace a handle by which
157 * to reference it.
158 */
psb_gem_dumb_create(struct drm_file * file,struct drm_device * dev,struct drm_mode_create_dumb * args)159 int psb_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
160 struct drm_mode_create_dumb *args)
161 {
162 args->pitch = ALIGN(args->width * ((args->bpp + 7) / 8), 64);
163 args->size = args->pitch * args->height;
164 return psb_gem_create(file, dev, args->size, &args->handle);
165 }
166
167 /**
168 * psb_gem_dumb_destroy - destroy a dumb buffer
169 * @file: client file
170 * @dev: our DRM device
171 * @handle: the object handle
172 *
173 * Destroy a handle that was created via psb_gem_dumb_create, at least
174 * we hope it was created that way. i915 seems to assume the caller
175 * does the checking but that might be worth review ! FIXME
176 */
psb_gem_dumb_destroy(struct drm_file * file,struct drm_device * dev,uint32_t handle)177 int psb_gem_dumb_destroy(struct drm_file *file, struct drm_device *dev,
178 uint32_t handle)
179 {
180 /* No special work needed, drop the reference and see what falls out */
181 return drm_gem_handle_delete(file, handle);
182 }
183
184 /**
185 * psb_gem_fault - pagefault handler for GEM objects
186 * @vma: the VMA of the GEM object
187 * @vmf: fault detail
188 *
189 * Invoked when a fault occurs on an mmap of a GEM managed area. GEM
190 * does most of the work for us including the actual map/unmap calls
191 * but we need to do the actual page work.
192 *
193 * This code eventually needs to handle faulting objects in and out
194 * of the GTT and repacking it when we run out of space. We can put
195 * that off for now and for our simple uses
196 *
197 * The VMA was set up by GEM. In doing so it also ensured that the
198 * vma->vm_private_data points to the GEM object that is backing this
199 * mapping.
200 */
psb_gem_fault(struct vm_area_struct * vma,struct vm_fault * vmf)201 int psb_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
202 {
203 struct drm_gem_object *obj;
204 struct gtt_range *r;
205 int ret;
206 unsigned long pfn;
207 pgoff_t page_offset;
208 struct drm_device *dev;
209 struct drm_psb_private *dev_priv;
210
211 obj = vma->vm_private_data; /* GEM object */
212 dev = obj->dev;
213 dev_priv = dev->dev_private;
214
215 r = container_of(obj, struct gtt_range, gem); /* Get the gtt range */
216
217 /* Make sure we don't parallel update on a fault, nor move or remove
218 something from beneath our feet */
219 mutex_lock(&dev->struct_mutex);
220
221 /* For now the mmap pins the object and it stays pinned. As things
222 stand that will do us no harm */
223 if (r->mmapping == 0) {
224 ret = psb_gtt_pin(r);
225 if (ret < 0) {
226 dev_err(dev->dev, "gma500: pin failed: %d\n", ret);
227 goto fail;
228 }
229 r->mmapping = 1;
230 }
231
232 /* Page relative to the VMA start - we must calculate this ourselves
233 because vmf->pgoff is the fake GEM offset */
234 page_offset = ((unsigned long) vmf->virtual_address - vma->vm_start)
235 >> PAGE_SHIFT;
236
237 /* CPU view of the page, don't go via the GART for CPU writes */
238 if (r->stolen)
239 pfn = (dev_priv->stolen_base + r->offset) >> PAGE_SHIFT;
240 else
241 pfn = page_to_pfn(r->pages[page_offset]);
242 ret = vm_insert_pfn(vma, (unsigned long)vmf->virtual_address, pfn);
243
244 fail:
245 mutex_unlock(&dev->struct_mutex);
246 switch (ret) {
247 case 0:
248 case -ERESTARTSYS:
249 case -EINTR:
250 return VM_FAULT_NOPAGE;
251 case -ENOMEM:
252 return VM_FAULT_OOM;
253 default:
254 return VM_FAULT_SIGBUS;
255 }
256 }
257
psb_gem_create_stolen(struct drm_file * file,struct drm_device * dev,int size,u32 * handle)258 static int psb_gem_create_stolen(struct drm_file *file, struct drm_device *dev,
259 int size, u32 *handle)
260 {
261 struct gtt_range *gtt = psb_gtt_alloc_range(dev, size, "gem", 1);
262 if (gtt == NULL)
263 return -ENOMEM;
264 if (drm_gem_private_object_init(dev, >t->gem, size) != 0)
265 goto free_gtt;
266 if (drm_gem_handle_create(file, >t->gem, handle) == 0)
267 return 0;
268 free_gtt:
269 psb_gtt_free_range(dev, gtt);
270 return -ENOMEM;
271 }
272
273 /*
274 * GEM interfaces for our specific client
275 */
psb_gem_create_ioctl(struct drm_device * dev,void * data,struct drm_file * file)276 int psb_gem_create_ioctl(struct drm_device *dev, void *data,
277 struct drm_file *file)
278 {
279 struct drm_psb_gem_create *args = data;
280 int ret;
281 if (args->flags & GMA_GEM_CREATE_STOLEN) {
282 ret = psb_gem_create_stolen(file, dev, args->size,
283 &args->handle);
284 if (ret == 0)
285 return 0;
286 /* Fall throguh */
287 args->flags &= ~GMA_GEM_CREATE_STOLEN;
288 }
289 return psb_gem_create(file, dev, args->size, &args->handle);
290 }
291
psb_gem_mmap_ioctl(struct drm_device * dev,void * data,struct drm_file * file)292 int psb_gem_mmap_ioctl(struct drm_device *dev, void *data,
293 struct drm_file *file)
294 {
295 struct drm_psb_gem_mmap *args = data;
296 return dev->driver->dumb_map_offset(file, dev,
297 args->handle, &args->offset);
298 }
299
300