2 * Copyright 2012 Red Hat
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.
8 * Authors: Matthew Garrett
12 #include <drm/drm_crtc_helper.h>
14 #include "cirrus_drv.h"
17 static void cirrus_user_framebuffer_destroy(struct drm_framebuffer *fb)
19 struct cirrus_framebuffer *cirrus_fb = to_cirrus_framebuffer(fb);
21 drm_gem_object_unreference_unlocked(cirrus_fb->obj);
22 drm_framebuffer_cleanup(fb);
26 static const struct drm_framebuffer_funcs cirrus_fb_funcs = {
27 .destroy = cirrus_user_framebuffer_destroy,
30 int cirrus_framebuffer_init(struct drm_device *dev,
31 struct cirrus_framebuffer *gfb,
32 const struct drm_mode_fb_cmd2 *mode_cmd,
33 struct drm_gem_object *obj)
37 drm_helper_mode_fill_fb_struct(&gfb->base, mode_cmd);
39 ret = drm_framebuffer_init(dev, &gfb->base, &cirrus_fb_funcs);
41 DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
47 static struct drm_framebuffer *
48 cirrus_user_framebuffer_create(struct drm_device *dev,
49 struct drm_file *filp,
50 const struct drm_mode_fb_cmd2 *mode_cmd)
52 struct cirrus_device *cdev = dev->dev_private;
53 struct drm_gem_object *obj;
54 struct cirrus_framebuffer *cirrus_fb;
58 drm_fb_get_bpp_depth(mode_cmd->pixel_format, &depth, &bpp);
60 if (!cirrus_check_framebuffer(cdev, mode_cmd->width, mode_cmd->height,
61 bpp, mode_cmd->pitches[0]))
62 return ERR_PTR(-EINVAL);
64 obj = drm_gem_object_lookup(filp, mode_cmd->handles[0]);
66 return ERR_PTR(-ENOENT);
68 cirrus_fb = kzalloc(sizeof(*cirrus_fb), GFP_KERNEL);
70 drm_gem_object_unreference_unlocked(obj);
71 return ERR_PTR(-ENOMEM);
74 ret = cirrus_framebuffer_init(dev, cirrus_fb, mode_cmd, obj);
76 drm_gem_object_unreference_unlocked(obj);
80 return &cirrus_fb->base;
83 static const struct drm_mode_config_funcs cirrus_mode_funcs = {
84 .fb_create = cirrus_user_framebuffer_create,
87 /* Unmap the framebuffer from the core and release the memory */
88 static void cirrus_vram_fini(struct cirrus_device *cdev)
92 if (cdev->mc.vram_base)
93 release_mem_region(cdev->mc.vram_base, cdev->mc.vram_size);
96 /* Map the framebuffer from the card and configure the core */
97 static int cirrus_vram_init(struct cirrus_device *cdev)
100 cdev->mc.vram_base = pci_resource_start(cdev->dev->pdev, 0);
101 cdev->mc.vram_size = pci_resource_len(cdev->dev->pdev, 0);
103 if (!request_mem_region(cdev->mc.vram_base, cdev->mc.vram_size,
104 "cirrusdrmfb_vram")) {
105 DRM_ERROR("can't reserve VRAM\n");
113 * Our emulated hardware has two sets of memory. One is video RAM and can
114 * simply be used as a linear framebuffer - the other provides mmio access
115 * to the display registers. The latter can also be accessed via IO port
116 * access, but we map the range and use mmio to program them instead
119 int cirrus_device_init(struct cirrus_device *cdev,
120 struct drm_device *ddev,
121 struct pci_dev *pdev, uint32_t flags)
128 /* Hardcode the number of CRTCs to 1 */
131 /* BAR 0 is the framebuffer, BAR 1 contains registers */
132 cdev->rmmio_base = pci_resource_start(cdev->dev->pdev, 1);
133 cdev->rmmio_size = pci_resource_len(cdev->dev->pdev, 1);
135 if (!request_mem_region(cdev->rmmio_base, cdev->rmmio_size,
136 "cirrusdrmfb_mmio")) {
137 DRM_ERROR("can't reserve mmio registers\n");
141 cdev->rmmio = ioremap(cdev->rmmio_base, cdev->rmmio_size);
143 if (cdev->rmmio == NULL)
146 ret = cirrus_vram_init(cdev);
148 release_mem_region(cdev->rmmio_base, cdev->rmmio_size);
155 void cirrus_device_fini(struct cirrus_device *cdev)
157 release_mem_region(cdev->rmmio_base, cdev->rmmio_size);
158 cirrus_vram_fini(cdev);
162 * Functions here will be called by the core once it's bound the driver to
166 int cirrus_driver_load(struct drm_device *dev, unsigned long flags)
168 struct cirrus_device *cdev;
171 cdev = kzalloc(sizeof(struct cirrus_device), GFP_KERNEL);
174 dev->dev_private = (void *)cdev;
176 r = cirrus_device_init(cdev, dev, dev->pdev, flags);
178 dev_err(&dev->pdev->dev, "Fatal error during GPU init: %d\n", r);
182 r = cirrus_mm_init(cdev);
184 dev_err(&dev->pdev->dev, "fatal err on mm init\n");
189 * cirrus_modeset_init() is initializing/registering the emulated fbdev
190 * and DRM internals can access/test some of the fields in
191 * mode_config->funcs as part of the fbdev registration process.
192 * Make sure dev->mode_config.funcs is properly set to avoid
193 * dereferencing a NULL pointer.
194 * FIXME: mode_config.funcs assignment should probably be done in
195 * cirrus_modeset_init() (that's a common pattern seen in other DRM
198 dev->mode_config.funcs = &cirrus_mode_funcs;
199 r = cirrus_modeset_init(cdev);
201 dev_err(&dev->pdev->dev, "Fatal error during modeset init: %d\n", r);
207 cirrus_driver_unload(dev);
211 int cirrus_driver_unload(struct drm_device *dev)
213 struct cirrus_device *cdev = dev->dev_private;
217 cirrus_modeset_fini(cdev);
218 cirrus_mm_fini(cdev);
219 cirrus_device_fini(cdev);
221 dev->dev_private = NULL;
225 int cirrus_gem_create(struct drm_device *dev,
226 u32 size, bool iskernel,
227 struct drm_gem_object **obj)
229 struct cirrus_bo *cirrusbo;
234 size = roundup(size, PAGE_SIZE);
238 ret = cirrus_bo_create(dev, size, 0, 0, &cirrusbo);
240 if (ret != -ERESTARTSYS)
241 DRM_ERROR("failed to allocate GEM object\n");
244 *obj = &cirrusbo->gem;
248 int cirrus_dumb_create(struct drm_file *file,
249 struct drm_device *dev,
250 struct drm_mode_create_dumb *args)
253 struct drm_gem_object *gobj;
256 args->pitch = args->width * ((args->bpp + 7) / 8);
257 args->size = args->pitch * args->height;
259 ret = cirrus_gem_create(dev, args->size, false,
264 ret = drm_gem_handle_create(file, gobj, &handle);
265 drm_gem_object_unreference_unlocked(gobj);
269 args->handle = handle;
273 static void cirrus_bo_unref(struct cirrus_bo **bo)
275 struct ttm_buffer_object *tbo;
285 void cirrus_gem_free_object(struct drm_gem_object *obj)
287 struct cirrus_bo *cirrus_bo = gem_to_cirrus_bo(obj);
289 cirrus_bo_unref(&cirrus_bo);
293 static inline u64 cirrus_bo_mmap_offset(struct cirrus_bo *bo)
295 return drm_vma_node_offset_addr(&bo->bo.vma_node);
299 cirrus_dumb_mmap_offset(struct drm_file *file,
300 struct drm_device *dev,
304 struct drm_gem_object *obj;
305 struct cirrus_bo *bo;
307 obj = drm_gem_object_lookup(file, handle);
311 bo = gem_to_cirrus_bo(obj);
312 *offset = cirrus_bo_mmap_offset(bo);
314 drm_gem_object_unreference_unlocked(obj);
319 bool cirrus_check_framebuffer(struct cirrus_device *cdev, int width, int height,
322 const int max_pitch = 0x1FF << 3; /* (4096 - 1) & ~111b bytes */
323 const int max_size = cdev->mc.vram_size;
325 if (bpp > cirrus_bpp)
330 if (pitch > max_pitch)
333 if (pitch * height > max_size)