1 /*
2 * Copyright 2012 Red Hat
3 *
4 * This file is subject to the terms and conditions of the GNU General
5 * Public License version 2. See the file COPYING in the main
6 * directory of this archive for more details.
7 *
8 * Authors: Matthew Garrett
9 * Dave Airlie
10 */
11 #include <drm/drmP.h>
12 #include <drm/drm_crtc_helper.h>
13
14 #include "cirrus_drv.h"
15
16
cirrus_user_framebuffer_destroy(struct drm_framebuffer * fb)17 static void cirrus_user_framebuffer_destroy(struct drm_framebuffer *fb)
18 {
19 struct cirrus_framebuffer *cirrus_fb = to_cirrus_framebuffer(fb);
20 if (cirrus_fb->obj)
21 drm_gem_object_unreference_unlocked(cirrus_fb->obj);
22 drm_framebuffer_cleanup(fb);
23 kfree(fb);
24 }
25
26 static const struct drm_framebuffer_funcs cirrus_fb_funcs = {
27 .destroy = cirrus_user_framebuffer_destroy,
28 };
29
cirrus_framebuffer_init(struct drm_device * dev,struct cirrus_framebuffer * gfb,struct drm_mode_fb_cmd2 * mode_cmd,struct drm_gem_object * obj)30 int cirrus_framebuffer_init(struct drm_device *dev,
31 struct cirrus_framebuffer *gfb,
32 struct drm_mode_fb_cmd2 *mode_cmd,
33 struct drm_gem_object *obj)
34 {
35 int ret;
36
37 drm_helper_mode_fill_fb_struct(&gfb->base, mode_cmd);
38 gfb->obj = obj;
39 ret = drm_framebuffer_init(dev, &gfb->base, &cirrus_fb_funcs);
40 if (ret) {
41 DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
42 return ret;
43 }
44 return 0;
45 }
46
47 static struct drm_framebuffer *
cirrus_user_framebuffer_create(struct drm_device * dev,struct drm_file * filp,struct drm_mode_fb_cmd2 * mode_cmd)48 cirrus_user_framebuffer_create(struct drm_device *dev,
49 struct drm_file *filp,
50 struct drm_mode_fb_cmd2 *mode_cmd)
51 {
52 struct drm_gem_object *obj;
53 struct cirrus_framebuffer *cirrus_fb;
54 int ret;
55 u32 bpp, depth;
56
57 drm_fb_get_bpp_depth(mode_cmd->pixel_format, &depth, &bpp);
58 /* cirrus can't handle > 24bpp framebuffers at all */
59 if (bpp > 24)
60 return ERR_PTR(-EINVAL);
61
62 obj = drm_gem_object_lookup(dev, filp, mode_cmd->handles[0]);
63 if (obj == NULL)
64 return ERR_PTR(-ENOENT);
65
66 cirrus_fb = kzalloc(sizeof(*cirrus_fb), GFP_KERNEL);
67 if (!cirrus_fb) {
68 drm_gem_object_unreference_unlocked(obj);
69 return ERR_PTR(-ENOMEM);
70 }
71
72 ret = cirrus_framebuffer_init(dev, cirrus_fb, mode_cmd, obj);
73 if (ret) {
74 drm_gem_object_unreference_unlocked(obj);
75 kfree(cirrus_fb);
76 return ERR_PTR(ret);
77 }
78 return &cirrus_fb->base;
79 }
80
81 static const struct drm_mode_config_funcs cirrus_mode_funcs = {
82 .fb_create = cirrus_user_framebuffer_create,
83 };
84
85 /* Unmap the framebuffer from the core and release the memory */
cirrus_vram_fini(struct cirrus_device * cdev)86 static void cirrus_vram_fini(struct cirrus_device *cdev)
87 {
88 iounmap(cdev->rmmio);
89 cdev->rmmio = NULL;
90 if (cdev->mc.vram_base)
91 release_mem_region(cdev->mc.vram_base, cdev->mc.vram_size);
92 }
93
94 /* Map the framebuffer from the card and configure the core */
cirrus_vram_init(struct cirrus_device * cdev)95 static int cirrus_vram_init(struct cirrus_device *cdev)
96 {
97 /* BAR 0 is VRAM */
98 cdev->mc.vram_base = pci_resource_start(cdev->dev->pdev, 0);
99 /* We have 4MB of VRAM */
100 cdev->mc.vram_size = 4 * 1024 * 1024;
101
102 if (!request_mem_region(cdev->mc.vram_base, cdev->mc.vram_size,
103 "cirrusdrmfb_vram")) {
104 DRM_ERROR("can't reserve VRAM\n");
105 return -ENXIO;
106 }
107
108 return 0;
109 }
110
111 /*
112 * Our emulated hardware has two sets of memory. One is video RAM and can
113 * simply be used as a linear framebuffer - the other provides mmio access
114 * to the display registers. The latter can also be accessed via IO port
115 * access, but we map the range and use mmio to program them instead
116 */
117
cirrus_device_init(struct cirrus_device * cdev,struct drm_device * ddev,struct pci_dev * pdev,uint32_t flags)118 int cirrus_device_init(struct cirrus_device *cdev,
119 struct drm_device *ddev,
120 struct pci_dev *pdev, uint32_t flags)
121 {
122 int ret;
123
124 cdev->dev = ddev;
125 cdev->flags = flags;
126
127 /* Hardcode the number of CRTCs to 1 */
128 cdev->num_crtc = 1;
129
130 /* BAR 0 is the framebuffer, BAR 1 contains registers */
131 cdev->rmmio_base = pci_resource_start(cdev->dev->pdev, 1);
132 cdev->rmmio_size = pci_resource_len(cdev->dev->pdev, 1);
133
134 if (!request_mem_region(cdev->rmmio_base, cdev->rmmio_size,
135 "cirrusdrmfb_mmio")) {
136 DRM_ERROR("can't reserve mmio registers\n");
137 return -ENOMEM;
138 }
139
140 cdev->rmmio = ioremap(cdev->rmmio_base, cdev->rmmio_size);
141
142 if (cdev->rmmio == NULL)
143 return -ENOMEM;
144
145 ret = cirrus_vram_init(cdev);
146 if (ret) {
147 release_mem_region(cdev->rmmio_base, cdev->rmmio_size);
148 return ret;
149 }
150
151 return 0;
152 }
153
cirrus_device_fini(struct cirrus_device * cdev)154 void cirrus_device_fini(struct cirrus_device *cdev)
155 {
156 release_mem_region(cdev->rmmio_base, cdev->rmmio_size);
157 cirrus_vram_fini(cdev);
158 }
159
160 /*
161 * Functions here will be called by the core once it's bound the driver to
162 * a PCI device
163 */
164
cirrus_driver_load(struct drm_device * dev,unsigned long flags)165 int cirrus_driver_load(struct drm_device *dev, unsigned long flags)
166 {
167 struct cirrus_device *cdev;
168 int r;
169
170 cdev = kzalloc(sizeof(struct cirrus_device), GFP_KERNEL);
171 if (cdev == NULL)
172 return -ENOMEM;
173 dev->dev_private = (void *)cdev;
174
175 r = cirrus_device_init(cdev, dev, dev->pdev, flags);
176 if (r) {
177 dev_err(&dev->pdev->dev, "Fatal error during GPU init: %d\n", r);
178 goto out;
179 }
180
181 r = cirrus_mm_init(cdev);
182 if (r)
183 dev_err(&dev->pdev->dev, "fatal err on mm init\n");
184
185 r = cirrus_modeset_init(cdev);
186 if (r)
187 dev_err(&dev->pdev->dev, "Fatal error during modeset init: %d\n", r);
188
189 dev->mode_config.funcs = (void *)&cirrus_mode_funcs;
190 out:
191 if (r)
192 cirrus_driver_unload(dev);
193 return r;
194 }
195
cirrus_driver_unload(struct drm_device * dev)196 int cirrus_driver_unload(struct drm_device *dev)
197 {
198 struct cirrus_device *cdev = dev->dev_private;
199
200 if (cdev == NULL)
201 return 0;
202 cirrus_modeset_fini(cdev);
203 cirrus_mm_fini(cdev);
204 cirrus_device_fini(cdev);
205 kfree(cdev);
206 dev->dev_private = NULL;
207 return 0;
208 }
209
cirrus_gem_create(struct drm_device * dev,u32 size,bool iskernel,struct drm_gem_object ** obj)210 int cirrus_gem_create(struct drm_device *dev,
211 u32 size, bool iskernel,
212 struct drm_gem_object **obj)
213 {
214 struct cirrus_bo *cirrusbo;
215 int ret;
216
217 *obj = NULL;
218
219 size = roundup(size, PAGE_SIZE);
220 if (size == 0)
221 return -EINVAL;
222
223 ret = cirrus_bo_create(dev, size, 0, 0, &cirrusbo);
224 if (ret) {
225 if (ret != -ERESTARTSYS)
226 DRM_ERROR("failed to allocate GEM object\n");
227 return ret;
228 }
229 *obj = &cirrusbo->gem;
230 return 0;
231 }
232
cirrus_dumb_create(struct drm_file * file,struct drm_device * dev,struct drm_mode_create_dumb * args)233 int cirrus_dumb_create(struct drm_file *file,
234 struct drm_device *dev,
235 struct drm_mode_create_dumb *args)
236 {
237 int ret;
238 struct drm_gem_object *gobj;
239 u32 handle;
240
241 args->pitch = args->width * ((args->bpp + 7) / 8);
242 args->size = args->pitch * args->height;
243
244 ret = cirrus_gem_create(dev, args->size, false,
245 &gobj);
246 if (ret)
247 return ret;
248
249 ret = drm_gem_handle_create(file, gobj, &handle);
250 drm_gem_object_unreference_unlocked(gobj);
251 if (ret)
252 return ret;
253
254 args->handle = handle;
255 return 0;
256 }
257
cirrus_bo_unref(struct cirrus_bo ** bo)258 static void cirrus_bo_unref(struct cirrus_bo **bo)
259 {
260 struct ttm_buffer_object *tbo;
261
262 if ((*bo) == NULL)
263 return;
264
265 tbo = &((*bo)->bo);
266 ttm_bo_unref(&tbo);
267 *bo = NULL;
268 }
269
cirrus_gem_free_object(struct drm_gem_object * obj)270 void cirrus_gem_free_object(struct drm_gem_object *obj)
271 {
272 struct cirrus_bo *cirrus_bo = gem_to_cirrus_bo(obj);
273
274 cirrus_bo_unref(&cirrus_bo);
275 }
276
277
cirrus_bo_mmap_offset(struct cirrus_bo * bo)278 static inline u64 cirrus_bo_mmap_offset(struct cirrus_bo *bo)
279 {
280 return drm_vma_node_offset_addr(&bo->bo.vma_node);
281 }
282
283 int
cirrus_dumb_mmap_offset(struct drm_file * file,struct drm_device * dev,uint32_t handle,uint64_t * offset)284 cirrus_dumb_mmap_offset(struct drm_file *file,
285 struct drm_device *dev,
286 uint32_t handle,
287 uint64_t *offset)
288 {
289 struct drm_gem_object *obj;
290 int ret;
291 struct cirrus_bo *bo;
292
293 mutex_lock(&dev->struct_mutex);
294 obj = drm_gem_object_lookup(dev, file, handle);
295 if (obj == NULL) {
296 ret = -ENOENT;
297 goto out_unlock;
298 }
299
300 bo = gem_to_cirrus_bo(obj);
301 *offset = cirrus_bo_mmap_offset(bo);
302
303 drm_gem_object_unreference(obj);
304 ret = 0;
305 out_unlock:
306 mutex_unlock(&dev->struct_mutex);
307 return ret;
308
309 }
310