Commit | Line | Data |
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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> |
0de23977 | 29 | #include <drm/drm_vma_manager.h> |
e32681d6 AC |
30 | #include "psb_drv.h" |
31 | ||
e32681d6 AC |
32 | void psb_gem_free_object(struct drm_gem_object *obj) |
33 | { | |
34 | struct gtt_range *gtt = container_of(obj, struct gtt_range, gem); | |
4d46259f LP |
35 | |
36 | /* Remove the list map if one is present */ | |
0de23977 | 37 | drm_gem_free_mmap_offset(obj); |
4d46259f LP |
38 | drm_gem_object_release(obj); |
39 | ||
e32681d6 AC |
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 | ||
e32681d6 AC |
65 | /* GEM does all our handle to object mapping */ |
66 | obj = drm_gem_object_lookup(dev, file, handle); | |
0e3089fa DV |
67 | if (obj == NULL) |
68 | return -ENOENT; | |
e32681d6 AC |
69 | |
70 | /* Make it mmapable */ | |
0de23977 DH |
71 | ret = drm_gem_create_mmap_offset(obj); |
72 | if (ret) | |
73 | goto out; | |
74 | *offset = drm_vma_node_offset_addr(&obj->vma_node); | |
e32681d6 | 75 | out: |
0e3089fa | 76 | drm_gem_object_unreference_unlocked(obj); |
e32681d6 AC |
77 | return ret; |
78 | } | |
79 | ||
80 | /** | |
81 | * psb_gem_create - create a mappable object | |
82 | * @file: the DRM file of the client | |
83 | * @dev: our device | |
84 | * @size: the size requested | |
85 | * @handlep: returned handle (opaque number) | |
86 | * | |
87 | * Create a GEM object, fill in the boilerplate and attach a handle to | |
88 | * it so that userspace can speak about it. This does the core work | |
89 | * for the various methods that do/will create GEM objects for things | |
90 | */ | |
c269c685 PJ |
91 | int psb_gem_create(struct drm_file *file, struct drm_device *dev, u64 size, |
92 | u32 *handlep, int stolen, u32 align) | |
e32681d6 AC |
93 | { |
94 | struct gtt_range *r; | |
95 | int ret; | |
96 | u32 handle; | |
97 | ||
98 | size = roundup(size, PAGE_SIZE); | |
99 | ||
100 | /* Allocate our object - for now a direct gtt range which is not | |
101 | stolen memory backed */ | |
c269c685 | 102 | r = psb_gtt_alloc_range(dev, size, "gem", 0, PAGE_SIZE); |
e32681d6 AC |
103 | if (r == NULL) { |
104 | dev_err(dev->dev, "no memory for %lld byte GEM object\n", size); | |
105 | return -ENOSPC; | |
106 | } | |
107 | /* Initialize the extra goodies GEM needs to do all the hard work */ | |
108 | if (drm_gem_object_init(dev, &r->gem, size) != 0) { | |
109 | psb_gtt_free_range(dev, r); | |
a746092b | 110 | /* GEM doesn't give an error code so use -ENOMEM */ |
e32681d6 AC |
111 | dev_err(dev->dev, "GEM init failed for %lld\n", size); |
112 | return -ENOMEM; | |
113 | } | |
398b4706 AC |
114 | /* Limit the object to 32bit mappings */ |
115 | mapping_set_gfp_mask(r->gem.filp->f_mapping, GFP_KERNEL | __GFP_DMA32); | |
e32681d6 AC |
116 | /* Give the object a handle so we can carry it more easily */ |
117 | ret = drm_gem_handle_create(file, &r->gem, &handle); | |
118 | if (ret) { | |
119 | dev_err(dev->dev, "GEM handle failed for %p, %lld\n", | |
120 | &r->gem, size); | |
121 | drm_gem_object_release(&r->gem); | |
122 | psb_gtt_free_range(dev, r); | |
123 | return ret; | |
124 | } | |
125 | /* We have the initial and handle reference but need only one now */ | |
d3e376f5 | 126 | drm_gem_object_unreference_unlocked(&r->gem); |
e32681d6 AC |
127 | *handlep = handle; |
128 | return 0; | |
129 | } | |
130 | ||
131 | /** | |
132 | * psb_gem_dumb_create - create a dumb buffer | |
133 | * @drm_file: our client file | |
134 | * @dev: our device | |
135 | * @args: the requested arguments copied from userspace | |
136 | * | |
137 | * Allocate a buffer suitable for use for a frame buffer of the | |
138 | * form described by user space. Give userspace a handle by which | |
139 | * to reference it. | |
140 | */ | |
141 | int psb_gem_dumb_create(struct drm_file *file, struct drm_device *dev, | |
142 | struct drm_mode_create_dumb *args) | |
143 | { | |
144 | args->pitch = ALIGN(args->width * ((args->bpp + 7) / 8), 64); | |
145 | args->size = args->pitch * args->height; | |
c269c685 PJ |
146 | return psb_gem_create(file, dev, args->size, &args->handle, 0, |
147 | PAGE_SIZE); | |
e32681d6 AC |
148 | } |
149 | ||
e32681d6 AC |
150 | /** |
151 | * psb_gem_fault - pagefault handler for GEM objects | |
152 | * @vma: the VMA of the GEM object | |
153 | * @vmf: fault detail | |
154 | * | |
155 | * Invoked when a fault occurs on an mmap of a GEM managed area. GEM | |
156 | * does most of the work for us including the actual map/unmap calls | |
157 | * but we need to do the actual page work. | |
158 | * | |
159 | * This code eventually needs to handle faulting objects in and out | |
160 | * of the GTT and repacking it when we run out of space. We can put | |
161 | * that off for now and for our simple uses | |
162 | * | |
163 | * The VMA was set up by GEM. In doing so it also ensured that the | |
164 | * vma->vm_private_data points to the GEM object that is backing this | |
165 | * mapping. | |
e32681d6 AC |
166 | */ |
167 | int psb_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) | |
168 | { | |
169 | struct drm_gem_object *obj; | |
170 | struct gtt_range *r; | |
171 | int ret; | |
172 | unsigned long pfn; | |
173 | pgoff_t page_offset; | |
174 | struct drm_device *dev; | |
175 | struct drm_psb_private *dev_priv; | |
176 | ||
177 | obj = vma->vm_private_data; /* GEM object */ | |
178 | dev = obj->dev; | |
179 | dev_priv = dev->dev_private; | |
180 | ||
181 | r = container_of(obj, struct gtt_range, gem); /* Get the gtt range */ | |
182 | ||
183 | /* Make sure we don't parallel update on a fault, nor move or remove | |
184 | something from beneath our feet */ | |
737292a3 | 185 | mutex_lock(&dev_priv->mmap_mutex); |
e32681d6 AC |
186 | |
187 | /* For now the mmap pins the object and it stays pinned. As things | |
188 | stand that will do us no harm */ | |
189 | if (r->mmapping == 0) { | |
190 | ret = psb_gtt_pin(r); | |
191 | if (ret < 0) { | |
192 | dev_err(dev->dev, "gma500: pin failed: %d\n", ret); | |
193 | goto fail; | |
194 | } | |
195 | r->mmapping = 1; | |
196 | } | |
197 | ||
198 | /* Page relative to the VMA start - we must calculate this ourselves | |
199 | because vmf->pgoff is the fake GEM offset */ | |
200 | page_offset = ((unsigned long) vmf->virtual_address - vma->vm_start) | |
201 | >> PAGE_SHIFT; | |
202 | ||
203 | /* CPU view of the page, don't go via the GART for CPU writes */ | |
204 | if (r->stolen) | |
205 | pfn = (dev_priv->stolen_base + r->offset) >> PAGE_SHIFT; | |
206 | else | |
207 | pfn = page_to_pfn(r->pages[page_offset]); | |
208 | ret = vm_insert_pfn(vma, (unsigned long)vmf->virtual_address, pfn); | |
209 | ||
210 | fail: | |
737292a3 | 211 | mutex_unlock(&dev_priv->mmap_mutex); |
e32681d6 AC |
212 | switch (ret) { |
213 | case 0: | |
214 | case -ERESTARTSYS: | |
215 | case -EINTR: | |
216 | return VM_FAULT_NOPAGE; | |
217 | case -ENOMEM: | |
218 | return VM_FAULT_OOM; | |
219 | default: | |
220 | return VM_FAULT_SIGBUS; | |
221 | } | |
222 | } |