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Commit | Line | Data |
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f20ee244 | 1 | /* |
7ed2911c | 2 | * psb GEM interface |
f20ee244 AC |
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: | |
5338afdf | 22 | * - we need to work out if the MMU is relevant (eg for |
f20ee244 | 23 | * accelerated operations on a GEM object) |
f20ee244 AC |
24 | */ |
25 | ||
26 | #include <drm/drmP.h> | |
27 | #include <drm/drm.h> | |
28 | #include "psb_drm.h" | |
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 | { | |
9886eb59 | 38 | struct gtt_range *gtt = container_of(obj, struct gtt_range, gem); |
2cf10d23 | 39 | drm_gem_object_release_wrap(obj); |
fb7ff7f6 AC |
40 | /* This must occur last as it frees up the memory of the GEM object */ |
41 | psb_gtt_free_range(obj->dev, gtt); | |
f20ee244 AC |
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 | { | |
0c4ac072 | 62 | int ret = 0; |
f20ee244 | 63 | struct drm_gem_object *obj; |
0c4ac072 | 64 | |
f20ee244 AC |
65 | if (!(dev->driver->driver_features & DRIVER_GEM)) |
66 | return -ENODEV; | |
e2e88603 | 67 | |
0c4ac072 AC |
68 | mutex_lock(&dev->struct_mutex); |
69 | ||
f20ee244 AC |
70 | /* GEM does all our handle to object mapping */ |
71 | obj = drm_gem_object_lookup(dev, file, handle); | |
0c4ac072 AC |
72 | if (obj == NULL) { |
73 | ret = -ENOENT; | |
74 | goto unlock; | |
75 | } | |
f20ee244 | 76 | /* What validation is needed here ? */ |
e2e88603 | 77 | |
0c4ac072 AC |
78 | /* Make it mmapable */ |
79 | if (!obj->map_list.map) { | |
eee9b52e | 80 | ret = gem_create_mmap_offset(obj); |
0c4ac072 AC |
81 | if (ret) |
82 | goto out; | |
83 | } | |
84 | /* GEM should really work out the hash offsets for us */ | |
f20ee244 | 85 | *offset = (u64)obj->map_list.hash.key << PAGE_SHIFT; |
0c4ac072 | 86 | out: |
f20ee244 | 87 | drm_gem_object_unreference(obj); |
0c4ac072 AC |
88 | unlock: |
89 | mutex_unlock(&dev->struct_mutex); | |
90 | return ret; | |
f20ee244 AC |
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 | ||
e2e88603 | 113 | /* Allocate our object - for now a direct gtt range which is not |
f20ee244 AC |
114 | stolen memory backed */ |
115 | r = psb_gtt_alloc_range(dev, size, "gem", 0); | |
daab23f1 AC |
116 | if (r == NULL) { |
117 | dev_err(dev->dev, "no memory for %lld byte GEM object\n", size); | |
f92e8834 | 118 | return -ENOSPC; |
daab23f1 | 119 | } |
f20ee244 AC |
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); | |
123 | /* GEM doesn't give an error code and we don't have an | |
124 | EGEMSUCKS so make something up for now - FIXME */ | |
daab23f1 | 125 | dev_err(dev->dev, "GEM init failed for %lld\n", size); |
f20ee244 AC |
126 | return -ENOMEM; |
127 | } | |
128 | /* Give the object a handle so we can carry it more easily */ | |
129 | ret = drm_gem_handle_create(file, &r->gem, &handle); | |
130 | if (ret) { | |
daab23f1 AC |
131 | dev_err(dev->dev, "GEM handle failed for %p, %lld\n", |
132 | &r->gem, size); | |
f20ee244 AC |
133 | drm_gem_object_release(&r->gem); |
134 | psb_gtt_free_range(dev, r); | |
135 | return ret; | |
136 | } | |
137 | /* We have the initial and handle reference but need only one now */ | |
138 | drm_gem_object_unreference(&r->gem); | |
139 | *handlep = handle; | |
140 | return 0; | |
141 | } | |
142 | ||
143 | /** | |
144 | * psb_gem_dumb_create - create a dumb buffer | |
145 | * @drm_file: our client file | |
146 | * @dev: our device | |
147 | * @args: the requested arguments copied from userspace | |
148 | * | |
149 | * Allocate a buffer suitable for use for a frame buffer of the | |
150 | * form described by user space. Give userspace a handle by which | |
151 | * to reference it. | |
152 | */ | |
153 | int psb_gem_dumb_create(struct drm_file *file, struct drm_device *dev, | |
154 | struct drm_mode_create_dumb *args) | |
155 | { | |
f92e8834 | 156 | args->pitch = ALIGN(args->width * ((args->bpp + 7) / 8), 64); |
f20ee244 AC |
157 | args->size = args->pitch * args->height; |
158 | return psb_gem_create(file, dev, args->size, &args->handle); | |
159 | } | |
160 | ||
161 | /** | |
162 | * psb_gem_dumb_destroy - destroy a dumb buffer | |
163 | * @file: client file | |
164 | * @dev: our DRM device | |
165 | * @handle: the object handle | |
166 | * | |
167 | * Destroy a handle that was created via psb_gem_dumb_create, at least | |
168 | * we hope it was created that way. i915 seems to assume the caller | |
169 | * does the checking but that might be worth review ! FIXME | |
170 | */ | |
171 | int psb_gem_dumb_destroy(struct drm_file *file, struct drm_device *dev, | |
172 | uint32_t handle) | |
173 | { | |
174 | /* No special work needed, drop the reference and see what falls out */ | |
175 | return drm_gem_handle_delete(file, handle); | |
176 | } | |
177 | ||
178 | /** | |
179 | * psb_gem_fault - pagefault handler for GEM objects | |
180 | * @vma: the VMA of the GEM object | |
181 | * @vmf: fault detail | |
182 | * | |
183 | * Invoked when a fault occurs on an mmap of a GEM managed area. GEM | |
184 | * does most of the work for us including the actual map/unmap calls | |
185 | * but we need to do the actual page work. | |
186 | * | |
187 | * This code eventually needs to handle faulting objects in and out | |
fb7ff7f6 | 188 | * of the GTT and repacking it when we run out of space. We can put |
f20ee244 AC |
189 | * that off for now and for our simple uses |
190 | * | |
191 | * The VMA was set up by GEM. In doing so it also ensured that the | |
192 | * vma->vm_private_data points to the GEM object that is backing this | |
193 | * mapping. | |
7ed2911c | 194 | * |
7ed2911c | 195 | * FIXME |
f20ee244 AC |
196 | */ |
197 | int psb_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) | |
198 | { | |
199 | struct drm_gem_object *obj; | |
200 | struct gtt_range *r; | |
201 | int ret; | |
202 | unsigned long pfn; | |
203 | pgoff_t page_offset; | |
7ed2911c | 204 | struct drm_device *dev; |
2cf10d23 | 205 | struct drm_psb_private *dev_priv; |
f20ee244 AC |
206 | |
207 | obj = vma->vm_private_data; /* GEM object */ | |
7ed2911c | 208 | dev = obj->dev; |
2cf10d23 | 209 | dev_priv = dev->dev_private; |
7ed2911c | 210 | |
f20ee244 AC |
211 | r = container_of(obj, struct gtt_range, gem); /* Get the gtt range */ |
212 | ||
7ed2911c AC |
213 | /* Make sure we don't parallel update on a fault, nor move or remove |
214 | something from beneath our feet */ | |
215 | mutex_lock(&dev->struct_mutex); | |
216 | ||
217 | /* For now the mmap pins the object and it stays pinned. As things | |
218 | stand that will do us no harm */ | |
219 | if (r->mmapping == 0) { | |
220 | ret = psb_gtt_pin(r); | |
221 | if (ret < 0) { | |
e2e88603 AC |
222 | dev_err(dev->dev, "gma500: pin failed: %d\n", ret); |
223 | goto fail; | |
224 | } | |
7ed2911c AC |
225 | r->mmapping = 1; |
226 | } | |
227 | ||
fb7ff7f6 AC |
228 | /* Page relative to the VMA start - we must calculate this ourselves |
229 | because vmf->pgoff is the fake GEM offset */ | |
f20ee244 AC |
230 | page_offset = ((unsigned long) vmf->virtual_address - vma->vm_start) |
231 | >> PAGE_SHIFT; | |
232 | ||
2cf10d23 AC |
233 | /* CPU view of the page, don't go via the GART for CPU writes */ |
234 | if (r->stolen) | |
235 | pfn = (dev_priv->stolen_base + r->offset) >> PAGE_SHIFT; | |
236 | else | |
237 | pfn = page_to_pfn(r->pages[page_offset]); | |
f20ee244 | 238 | ret = vm_insert_pfn(vma, (unsigned long)vmf->virtual_address, pfn); |
7ed2911c AC |
239 | |
240 | fail: | |
e2e88603 | 241 | mutex_unlock(&dev->struct_mutex); |
f20ee244 AC |
242 | switch (ret) { |
243 | case 0: | |
244 | case -ERESTARTSYS: | |
245 | case -EINTR: | |
246 | return VM_FAULT_NOPAGE; | |
247 | case -ENOMEM: | |
248 | return VM_FAULT_OOM; | |
249 | default: | |
250 | return VM_FAULT_SIGBUS; | |
251 | } | |
252 | } | |
c5c44531 AC |
253 | |
254 | /* | |
255 | * GEM interfaces for our specific client | |
256 | */ | |
257 | int psb_gem_create_ioctl(struct drm_device *dev, void *data, | |
258 | struct drm_file *file) | |
259 | { | |
260 | struct drm_psb_gem_create *args = data; | |
261 | return psb_gem_create(file, dev, args->size, &args->handle); | |
262 | } | |
263 | ||
7dfe43c5 AC |
264 | int psb_gem_mmap_ioctl(struct drm_device *dev, void *data, |
265 | struct drm_file *file) | |
266 | { | |
267 | struct drm_psb_gem_mmap *args = data; | |
268 | return dev->driver->dumb_map_offset(file, dev, | |
269 | args->handle, &args->offset); | |
270 | } | |
271 |