Commit | Line | Data |
---|---|---|
e32681d6 AC |
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> | |
760285e7 | 28 | #include <drm/gma_drm.h> |
e32681d6 AC |
29 | #include "psb_drv.h" |
30 | ||
31 | int psb_gem_init_object(struct drm_gem_object *obj) | |
32 | { | |
33 | return -EINVAL; | |
34 | } | |
35 | ||
36 | void psb_gem_free_object(struct drm_gem_object *obj) | |
37 | { | |
38 | struct gtt_range *gtt = container_of(obj, struct gtt_range, gem); | |
4d46259f LP |
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 | ||
e32681d6 AC |
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 | ||
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 | */ | |
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) { | |
4d46259f | 85 | ret = drm_gem_create_mmap_offset(obj); |
e32681d6 AC |
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 | */ | |
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); | |
a746092b | 128 | /* GEM doesn't give an error code so use -ENOMEM */ |
e32681d6 AC |
129 | dev_err(dev->dev, "GEM init failed for %lld\n", size); |
130 | return -ENOMEM; | |
131 | } | |
398b4706 AC |
132 | /* Limit the object to 32bit mappings */ |
133 | mapping_set_gfp_mask(r->gem.filp->f_mapping, GFP_KERNEL | __GFP_DMA32); | |
e32681d6 AC |
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 | */ | |
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 | */ | |
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. | |
e32681d6 AC |
200 | */ |
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 | ||
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 | */ | |
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; | |
770179d5 | 281 | if (args->flags & GMA_GEM_CREATE_STOLEN) { |
e32681d6 AC |
282 | ret = psb_gem_create_stolen(file, dev, args->size, |
283 | &args->handle); | |
284 | if (ret == 0) | |
285 | return 0; | |
286 | /* Fall throguh */ | |
770179d5 | 287 | args->flags &= ~GMA_GEM_CREATE_STOLEN; |
e32681d6 AC |
288 | } |
289 | return psb_gem_create(file, dev, args->size, &args->handle); | |
290 | } | |
291 | ||
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 |