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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 "gma_drm.h"
29#include "psb_drv.h"
30
31int psb_gem_init_object(struct drm_gem_object *obj)
32{
33 return -EINVAL;
34}
35
36void 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
44int 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 */
59int 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;
86out:
87 drm_gem_object_unreference(obj);
88unlock:
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 */
104static 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);
123 /* GEM doesn't give an error code so use -ENOMEM */
124 dev_err(dev->dev, "GEM init failed for %lld\n", size);
125 return -ENOMEM;
126 }
127 /* Limit the object to 32bit mappings */
128 mapping_set_gfp_mask(r->gem.filp->f_mapping, GFP_KERNEL | __GFP_DMA32);
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 */
154int 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 */
172int 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.
195 */
196int 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
239fail:
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
253static 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;
263free_gtt:
264 psb_gtt_free_range(dev, gtt);
265 return -ENOMEM;
266}
267
268/*
269 * GEM interfaces for our specific client
270 */
271int 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;
276 if (args->flags & GMA_GEM_CREATE_STOLEN) {
277 ret = psb_gem_create_stolen(file, dev, args->size,
278 &args->handle);
279 if (ret == 0)
280 return 0;
281 /* Fall throguh */
282 args->flags &= ~GMA_GEM_CREATE_STOLEN;
283 }
284 return psb_gem_create(file, dev, args->size, &args->handle);
285}
286
287int 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