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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); | |
39 | drm_gem_object_release_wrap(obj); | |
40 | /* This must occur last as it frees up the memory of the GEM object */ | |
41 | psb_gtt_free_range(obj->dev, gtt); | |
42 | } | |
43 | ||
44 | int psb_gem_get_aperture(struct drm_device *dev, void *data, | |
45 | struct drm_file *file) | |
46 | { | |
47 | return -EINVAL; | |
48 | } | |
49 | ||
50 | /** | |
51 | * psb_gem_dumb_map_gtt - buffer mapping for dumb interface | |
52 | * @file: our drm client file | |
53 | * @dev: drm device | |
54 | * @handle: GEM handle to the object (from dumb_create) | |
55 | * | |
56 | * Do the necessary setup to allow the mapping of the frame buffer | |
57 | * into user memory. We don't have to do much here at the moment. | |
58 | */ | |
59 | int psb_gem_dumb_map_gtt(struct drm_file *file, struct drm_device *dev, | |
60 | uint32_t handle, uint64_t *offset) | |
61 | { | |
62 | int ret = 0; | |
63 | struct drm_gem_object *obj; | |
64 | ||
65 | if (!(dev->driver->driver_features & DRIVER_GEM)) | |
66 | return -ENODEV; | |
67 | ||
68 | mutex_lock(&dev->struct_mutex); | |
69 | ||
70 | /* GEM does all our handle to object mapping */ | |
71 | obj = drm_gem_object_lookup(dev, file, handle); | |
72 | if (obj == NULL) { | |
73 | ret = -ENOENT; | |
74 | goto unlock; | |
75 | } | |
76 | /* What validation is needed here ? */ | |
77 | ||
78 | /* Make it mmapable */ | |
79 | if (!obj->map_list.map) { | |
80 | ret = gem_create_mmap_offset(obj); | |
81 | if (ret) | |
82 | goto out; | |
83 | } | |
84 | /* GEM should really work out the hash offsets for us */ | |
85 | *offset = (u64)obj->map_list.hash.key << PAGE_SHIFT; | |
86 | out: | |
87 | drm_gem_object_unreference(obj); | |
88 | unlock: | |
89 | mutex_unlock(&dev->struct_mutex); | |
90 | return ret; | |
91 | } | |
92 | ||
93 | /** | |
94 | * psb_gem_create - create a mappable object | |
95 | * @file: the DRM file of the client | |
96 | * @dev: our device | |
97 | * @size: the size requested | |
98 | * @handlep: returned handle (opaque number) | |
99 | * | |
100 | * Create a GEM object, fill in the boilerplate and attach a handle to | |
101 | * it so that userspace can speak about it. This does the core work | |
102 | * for the various methods that do/will create GEM objects for things | |
103 | */ | |
104 | static int psb_gem_create(struct drm_file *file, | |
105 | struct drm_device *dev, uint64_t size, uint32_t *handlep) | |
106 | { | |
107 | struct gtt_range *r; | |
108 | int ret; | |
109 | u32 handle; | |
110 | ||
111 | size = roundup(size, PAGE_SIZE); | |
112 | ||
113 | /* Allocate our object - for now a direct gtt range which is not | |
114 | stolen memory backed */ | |
115 | r = psb_gtt_alloc_range(dev, size, "gem", 0); | |
116 | if (r == NULL) { | |
117 | dev_err(dev->dev, "no memory for %lld byte GEM object\n", size); | |
118 | return -ENOSPC; | |
119 | } | |
120 | /* Initialize the extra goodies GEM needs to do all the hard work */ | |
121 | if (drm_gem_object_init(dev, &r->gem, size) != 0) { | |
122 | psb_gtt_free_range(dev, r); | |
a746092b | 123 | /* GEM doesn't give an error code so use -ENOMEM */ |
e32681d6 AC |
124 | dev_err(dev->dev, "GEM init failed for %lld\n", size); |
125 | return -ENOMEM; | |
126 | } | |
398b4706 AC |
127 | /* Limit the object to 32bit mappings */ |
128 | mapping_set_gfp_mask(r->gem.filp->f_mapping, GFP_KERNEL | __GFP_DMA32); | |
e32681d6 AC |
129 | /* Give the object a handle so we can carry it more easily */ |
130 | ret = drm_gem_handle_create(file, &r->gem, &handle); | |
131 | if (ret) { | |
132 | dev_err(dev->dev, "GEM handle failed for %p, %lld\n", | |
133 | &r->gem, size); | |
134 | drm_gem_object_release(&r->gem); | |
135 | psb_gtt_free_range(dev, r); | |
136 | return ret; | |
137 | } | |
138 | /* We have the initial and handle reference but need only one now */ | |
139 | drm_gem_object_unreference(&r->gem); | |
140 | *handlep = handle; | |
141 | return 0; | |
142 | } | |
143 | ||
144 | /** | |
145 | * psb_gem_dumb_create - create a dumb buffer | |
146 | * @drm_file: our client file | |
147 | * @dev: our device | |
148 | * @args: the requested arguments copied from userspace | |
149 | * | |
150 | * Allocate a buffer suitable for use for a frame buffer of the | |
151 | * form described by user space. Give userspace a handle by which | |
152 | * to reference it. | |
153 | */ | |
154 | int psb_gem_dumb_create(struct drm_file *file, struct drm_device *dev, | |
155 | struct drm_mode_create_dumb *args) | |
156 | { | |
157 | args->pitch = ALIGN(args->width * ((args->bpp + 7) / 8), 64); | |
158 | args->size = args->pitch * args->height; | |
159 | return psb_gem_create(file, dev, args->size, &args->handle); | |
160 | } | |
161 | ||
162 | /** | |
163 | * psb_gem_dumb_destroy - destroy a dumb buffer | |
164 | * @file: client file | |
165 | * @dev: our DRM device | |
166 | * @handle: the object handle | |
167 | * | |
168 | * Destroy a handle that was created via psb_gem_dumb_create, at least | |
169 | * we hope it was created that way. i915 seems to assume the caller | |
170 | * does the checking but that might be worth review ! FIXME | |
171 | */ | |
172 | int psb_gem_dumb_destroy(struct drm_file *file, struct drm_device *dev, | |
173 | uint32_t handle) | |
174 | { | |
175 | /* No special work needed, drop the reference and see what falls out */ | |
176 | return drm_gem_handle_delete(file, handle); | |
177 | } | |
178 | ||
179 | /** | |
180 | * psb_gem_fault - pagefault handler for GEM objects | |
181 | * @vma: the VMA of the GEM object | |
182 | * @vmf: fault detail | |
183 | * | |
184 | * Invoked when a fault occurs on an mmap of a GEM managed area. GEM | |
185 | * does most of the work for us including the actual map/unmap calls | |
186 | * but we need to do the actual page work. | |
187 | * | |
188 | * This code eventually needs to handle faulting objects in and out | |
189 | * of the GTT and repacking it when we run out of space. We can put | |
190 | * that off for now and for our simple uses | |
191 | * | |
192 | * The VMA was set up by GEM. In doing so it also ensured that the | |
193 | * vma->vm_private_data points to the GEM object that is backing this | |
194 | * mapping. | |
e32681d6 AC |
195 | */ |
196 | int psb_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) | |
197 | { | |
198 | struct drm_gem_object *obj; | |
199 | struct gtt_range *r; | |
200 | int ret; | |
201 | unsigned long pfn; | |
202 | pgoff_t page_offset; | |
203 | struct drm_device *dev; | |
204 | struct drm_psb_private *dev_priv; | |
205 | ||
206 | obj = vma->vm_private_data; /* GEM object */ | |
207 | dev = obj->dev; | |
208 | dev_priv = dev->dev_private; | |
209 | ||
210 | r = container_of(obj, struct gtt_range, gem); /* Get the gtt range */ | |
211 | ||
212 | /* Make sure we don't parallel update on a fault, nor move or remove | |
213 | something from beneath our feet */ | |
214 | mutex_lock(&dev->struct_mutex); | |
215 | ||
216 | /* For now the mmap pins the object and it stays pinned. As things | |
217 | stand that will do us no harm */ | |
218 | if (r->mmapping == 0) { | |
219 | ret = psb_gtt_pin(r); | |
220 | if (ret < 0) { | |
221 | dev_err(dev->dev, "gma500: pin failed: %d\n", ret); | |
222 | goto fail; | |
223 | } | |
224 | r->mmapping = 1; | |
225 | } | |
226 | ||
227 | /* Page relative to the VMA start - we must calculate this ourselves | |
228 | because vmf->pgoff is the fake GEM offset */ | |
229 | page_offset = ((unsigned long) vmf->virtual_address - vma->vm_start) | |
230 | >> PAGE_SHIFT; | |
231 | ||
232 | /* CPU view of the page, don't go via the GART for CPU writes */ | |
233 | if (r->stolen) | |
234 | pfn = (dev_priv->stolen_base + r->offset) >> PAGE_SHIFT; | |
235 | else | |
236 | pfn = page_to_pfn(r->pages[page_offset]); | |
237 | ret = vm_insert_pfn(vma, (unsigned long)vmf->virtual_address, pfn); | |
238 | ||
239 | fail: | |
240 | mutex_unlock(&dev->struct_mutex); | |
241 | switch (ret) { | |
242 | case 0: | |
243 | case -ERESTARTSYS: | |
244 | case -EINTR: | |
245 | return VM_FAULT_NOPAGE; | |
246 | case -ENOMEM: | |
247 | return VM_FAULT_OOM; | |
248 | default: | |
249 | return VM_FAULT_SIGBUS; | |
250 | } | |
251 | } | |
252 | ||
253 | static int psb_gem_create_stolen(struct drm_file *file, struct drm_device *dev, | |
254 | int size, u32 *handle) | |
255 | { | |
256 | struct gtt_range *gtt = psb_gtt_alloc_range(dev, size, "gem", 1); | |
257 | if (gtt == NULL) | |
258 | return -ENOMEM; | |
259 | if (drm_gem_private_object_init(dev, >t->gem, size) != 0) | |
260 | goto free_gtt; | |
261 | if (drm_gem_handle_create(file, >t->gem, handle) == 0) | |
262 | return 0; | |
263 | free_gtt: | |
264 | psb_gtt_free_range(dev, gtt); | |
265 | return -ENOMEM; | |
266 | } | |
267 | ||
268 | /* | |
269 | * GEM interfaces for our specific client | |
270 | */ | |
271 | int psb_gem_create_ioctl(struct drm_device *dev, void *data, | |
272 | struct drm_file *file) | |
273 | { | |
274 | struct drm_psb_gem_create *args = data; | |
275 | int ret; | |
770179d5 | 276 | if (args->flags & GMA_GEM_CREATE_STOLEN) { |
e32681d6 AC |
277 | ret = psb_gem_create_stolen(file, dev, args->size, |
278 | &args->handle); | |
279 | if (ret == 0) | |
280 | return 0; | |
281 | /* Fall throguh */ | |
770179d5 | 282 | args->flags &= ~GMA_GEM_CREATE_STOLEN; |
e32681d6 AC |
283 | } |
284 | return psb_gem_create(file, dev, args->size, &args->handle); | |
285 | } | |
286 | ||
287 | int psb_gem_mmap_ioctl(struct drm_device *dev, void *data, | |
288 | struct drm_file *file) | |
289 | { | |
290 | struct drm_psb_gem_mmap *args = data; | |
291 | return dev->driver->dumb_map_offset(file, dev, | |
292 | args->handle, &args->offset); | |
293 | } | |
294 |