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v4.6
  1/*
  2 * Copyright 2010 Matt Turner.
  3 * Copyright 2012 Red Hat
  4 *
  5 * This file is subject to the terms and conditions of the GNU General
  6 * Public License version 2. See the file COPYING in the main
  7 * directory of this archive for more details.
  8 *
  9 * Authors: Matthew Garrett
 10 *          Matt Turner
 11 *          Dave Airlie
 12 */
 13#include <drm/drmP.h>
 14#include <drm/drm_crtc_helper.h>
 15#include "mgag200_drv.h"
 16
 17static void mga_user_framebuffer_destroy(struct drm_framebuffer *fb)
 18{
 19	struct mga_framebuffer *mga_fb = to_mga_framebuffer(fb);
 20	if (mga_fb->obj)
 21		drm_gem_object_unreference_unlocked(mga_fb->obj);
 22	drm_framebuffer_cleanup(fb);
 23	kfree(fb);
 24}
 25
 26static const struct drm_framebuffer_funcs mga_fb_funcs = {
 27	.destroy = mga_user_framebuffer_destroy,
 28};
 29
 30int mgag200_framebuffer_init(struct drm_device *dev,
 31			     struct mga_framebuffer *gfb,
 32			     const 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, &mga_fb_funcs);
 40	if (ret) {
 41		DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
 42		return ret;
 43	}
 44	return 0;
 45}
 46
 47static struct drm_framebuffer *
 48mgag200_user_framebuffer_create(struct drm_device *dev,
 49				struct drm_file *filp,
 50				const struct drm_mode_fb_cmd2 *mode_cmd)
 51{
 52	struct drm_gem_object *obj;
 53	struct mga_framebuffer *mga_fb;
 54	int ret;
 55
 56	obj = drm_gem_object_lookup(dev, filp, mode_cmd->handles[0]);
 57	if (obj == NULL)
 58		return ERR_PTR(-ENOENT);
 59
 60	mga_fb = kzalloc(sizeof(*mga_fb), GFP_KERNEL);
 61	if (!mga_fb) {
 62		drm_gem_object_unreference_unlocked(obj);
 63		return ERR_PTR(-ENOMEM);
 64	}
 65
 66	ret = mgag200_framebuffer_init(dev, mga_fb, mode_cmd, obj);
 67	if (ret) {
 68		drm_gem_object_unreference_unlocked(obj);
 69		kfree(mga_fb);
 70		return ERR_PTR(ret);
 71	}
 72	return &mga_fb->base;
 73}
 74
 75static const struct drm_mode_config_funcs mga_mode_funcs = {
 76	.fb_create = mgag200_user_framebuffer_create,
 77};
 78
 79static int mga_probe_vram(struct mga_device *mdev, void __iomem *mem)
 80{
 81	int offset;
 82	int orig;
 83	int test1, test2;
 84	int orig1, orig2;
 85	unsigned int vram_size;
 86
 87	/* Probe */
 88	orig = ioread16(mem);
 89	iowrite16(0, mem);
 90
 91	vram_size = mdev->mc.vram_window;
 92
 93	if ((mdev->type == G200_EW3) && (vram_size >= 0x1000000)) {
 94		vram_size = vram_size - 0x400000;
 95	}
 96
 97	for (offset = 0x100000; offset < vram_size; offset += 0x4000) {
 98		orig1 = ioread8(mem + offset);
 99		orig2 = ioread8(mem + offset + 0x100);
100
101		iowrite16(0xaa55, mem + offset);
102		iowrite16(0xaa55, mem + offset + 0x100);
103
104		test1 = ioread16(mem + offset);
105		test2 = ioread16(mem);
106
107		iowrite16(orig1, mem + offset);
108		iowrite16(orig2, mem + offset + 0x100);
109
110		if (test1 != 0xaa55) {
111			break;
112		}
113
114		if (test2) {
115			break;
116		}
117	}
118
119	iowrite16(orig, mem);
120	return offset - 65536;
121}
122
123/* Map the framebuffer from the card and configure the core */
124static int mga_vram_init(struct mga_device *mdev)
125{
126	void __iomem *mem;
127	struct apertures_struct *aper = alloc_apertures(1);
128	if (!aper)
129		return -ENOMEM;
130
131	/* BAR 0 is VRAM */
132	mdev->mc.vram_base = pci_resource_start(mdev->dev->pdev, 0);
133	mdev->mc.vram_window = pci_resource_len(mdev->dev->pdev, 0);
134
135	aper->ranges[0].base = mdev->mc.vram_base;
136	aper->ranges[0].size = mdev->mc.vram_window;
137
138	remove_conflicting_framebuffers(aper, "mgafb", true);
139	kfree(aper);
140
141	if (!devm_request_mem_region(mdev->dev->dev, mdev->mc.vram_base, mdev->mc.vram_window,
142				"mgadrmfb_vram")) {
143		DRM_ERROR("can't reserve VRAM\n");
144		return -ENXIO;
145	}
146
147	mem = pci_iomap(mdev->dev->pdev, 0, 0);
148
149	mdev->mc.vram_size = mga_probe_vram(mdev, mem);
150
151	pci_iounmap(mdev->dev->pdev, mem);
152
153	return 0;
154}
155
156static int mgag200_device_init(struct drm_device *dev,
157			       uint32_t flags)
158{
159	struct mga_device *mdev = dev->dev_private;
160	int ret, option;
161
162	mdev->type = flags;
163
164	/* Hardcode the number of CRTCs to 1 */
165	mdev->num_crtc = 1;
166
167	pci_read_config_dword(dev->pdev, PCI_MGA_OPTION, &option);
168	mdev->has_sdram = !(option & (1 << 14));
169
170	/* BAR 0 is the framebuffer, BAR 1 contains registers */
171	mdev->rmmio_base = pci_resource_start(mdev->dev->pdev, 1);
172	mdev->rmmio_size = pci_resource_len(mdev->dev->pdev, 1);
173
174	if (!devm_request_mem_region(mdev->dev->dev, mdev->rmmio_base, mdev->rmmio_size,
175				"mgadrmfb_mmio")) {
176		DRM_ERROR("can't reserve mmio registers\n");
177		return -ENOMEM;
178	}
179
180	mdev->rmmio = pcim_iomap(dev->pdev, 1, 0);
181	if (mdev->rmmio == NULL)
182		return -ENOMEM;
183
184	/* stash G200 SE model number for later use */
185	if (IS_G200_SE(mdev))
186		mdev->unique_rev_id = RREG32(0x1e24);
187
188	ret = mga_vram_init(mdev);
189	if (ret)
190		return ret;
191
192	mdev->bpp_shifts[0] = 0;
193	mdev->bpp_shifts[1] = 1;
194	mdev->bpp_shifts[2] = 0;
195	mdev->bpp_shifts[3] = 2;
196	return 0;
197}
198
199/*
200 * Functions here will be called by the core once it's bound the driver to
201 * a PCI device
202 */
203
204
205int mgag200_driver_load(struct drm_device *dev, unsigned long flags)
206{
207	struct mga_device *mdev;
208	int r;
209
210	mdev = devm_kzalloc(dev->dev, sizeof(struct mga_device), GFP_KERNEL);
211	if (mdev == NULL)
212		return -ENOMEM;
213	dev->dev_private = (void *)mdev;
214	mdev->dev = dev;
215
216	r = mgag200_device_init(dev, flags);
217	if (r) {
218		dev_err(&dev->pdev->dev, "Fatal error during GPU init: %d\n", r);
219		return r;
220	}
221	r = mgag200_mm_init(mdev);
222	if (r)
223		goto err_mm;
224
225	drm_mode_config_init(dev);
226	dev->mode_config.funcs = (void *)&mga_mode_funcs;
227	if (IS_G200_SE(mdev) && mdev->mc.vram_size < (2048*1024))
228		dev->mode_config.preferred_depth = 16;
229	else
230		dev->mode_config.preferred_depth = 24;
231	dev->mode_config.prefer_shadow = 1;
232
233	r = mgag200_modeset_init(mdev);
234	if (r) {
235		dev_err(&dev->pdev->dev, "Fatal error during modeset init: %d\n", r);
236		goto err_modeset;
237	}
238
239	/* Make small buffers to store a hardware cursor (double buffered icon updates) */
240	mgag200_bo_create(dev, roundup(48*64, PAGE_SIZE), 0, 0,
241					  &mdev->cursor.pixels_1);
242	mgag200_bo_create(dev, roundup(48*64, PAGE_SIZE), 0, 0,
243					  &mdev->cursor.pixels_2);
244	if (!mdev->cursor.pixels_2 || !mdev->cursor.pixels_1) {
245		mdev->cursor.pixels_1 = NULL;
246		mdev->cursor.pixels_2 = NULL;
247		dev_warn(&dev->pdev->dev,
248			"Could not allocate space for cursors. Not doing hardware cursors.\n");
249	} else {
250		mdev->cursor.pixels_current = mdev->cursor.pixels_1;
251		mdev->cursor.pixels_prev = mdev->cursor.pixels_2;
252	}
253
254	return 0;
255
256err_modeset:
257	drm_mode_config_cleanup(dev);
258	mgag200_mm_fini(mdev);
259err_mm:
260	dev->dev_private = NULL;
261
262	return r;
263}
264
265int mgag200_driver_unload(struct drm_device *dev)
266{
267	struct mga_device *mdev = dev->dev_private;
268
269	if (mdev == NULL)
270		return 0;
271	mgag200_modeset_fini(mdev);
272	mgag200_fbdev_fini(mdev);
273	drm_mode_config_cleanup(dev);
274	mgag200_mm_fini(mdev);
275	dev->dev_private = NULL;
276	return 0;
277}
278
279int mgag200_gem_create(struct drm_device *dev,
280		   u32 size, bool iskernel,
281		   struct drm_gem_object **obj)
282{
283	struct mgag200_bo *astbo;
284	int ret;
285
286	*obj = NULL;
287
288	size = roundup(size, PAGE_SIZE);
289	if (size == 0)
290		return -EINVAL;
291
292	ret = mgag200_bo_create(dev, size, 0, 0, &astbo);
293	if (ret) {
294		if (ret != -ERESTARTSYS)
295			DRM_ERROR("failed to allocate GEM object\n");
296		return ret;
297	}
298	*obj = &astbo->gem;
299	return 0;
300}
301
302int mgag200_dumb_create(struct drm_file *file,
303		    struct drm_device *dev,
304		    struct drm_mode_create_dumb *args)
305{
306	int ret;
307	struct drm_gem_object *gobj;
308	u32 handle;
309
310	args->pitch = args->width * ((args->bpp + 7) / 8);
311	args->size = args->pitch * args->height;
312
313	ret = mgag200_gem_create(dev, args->size, false,
314			     &gobj);
315	if (ret)
316		return ret;
317
318	ret = drm_gem_handle_create(file, gobj, &handle);
319	drm_gem_object_unreference_unlocked(gobj);
320	if (ret)
321		return ret;
322
323	args->handle = handle;
324	return 0;
325}
326
327static void mgag200_bo_unref(struct mgag200_bo **bo)
328{
329	struct ttm_buffer_object *tbo;
330
331	if ((*bo) == NULL)
332		return;
333
334	tbo = &((*bo)->bo);
335	ttm_bo_unref(&tbo);
336	*bo = NULL;
337}
338
339void mgag200_gem_free_object(struct drm_gem_object *obj)
340{
341	struct mgag200_bo *mgag200_bo = gem_to_mga_bo(obj);
342
343	mgag200_bo_unref(&mgag200_bo);
344}
345
346
347static inline u64 mgag200_bo_mmap_offset(struct mgag200_bo *bo)
348{
349	return drm_vma_node_offset_addr(&bo->bo.vma_node);
350}
351
352int
353mgag200_dumb_mmap_offset(struct drm_file *file,
354		     struct drm_device *dev,
355		     uint32_t handle,
356		     uint64_t *offset)
357{
358	struct drm_gem_object *obj;
359	struct mgag200_bo *bo;
360
361	obj = drm_gem_object_lookup(dev, file, handle);
362	if (obj == NULL)
363		return -ENOENT;
364
365	bo = gem_to_mga_bo(obj);
366	*offset = mgag200_bo_mmap_offset(bo);
367
368	drm_gem_object_unreference_unlocked(obj);
369	return 0;
370}
v4.10.11
  1/*
  2 * Copyright 2010 Matt Turner.
  3 * Copyright 2012 Red Hat
  4 *
  5 * This file is subject to the terms and conditions of the GNU General
  6 * Public License version 2. See the file COPYING in the main
  7 * directory of this archive for more details.
  8 *
  9 * Authors: Matthew Garrett
 10 *          Matt Turner
 11 *          Dave Airlie
 12 */
 13#include <drm/drmP.h>
 14#include <drm/drm_crtc_helper.h>
 15#include "mgag200_drv.h"
 16
 17static void mga_user_framebuffer_destroy(struct drm_framebuffer *fb)
 18{
 19	struct mga_framebuffer *mga_fb = to_mga_framebuffer(fb);
 20
 21	drm_gem_object_unreference_unlocked(mga_fb->obj);
 22	drm_framebuffer_cleanup(fb);
 23	kfree(fb);
 24}
 25
 26static const struct drm_framebuffer_funcs mga_fb_funcs = {
 27	.destroy = mga_user_framebuffer_destroy,
 28};
 29
 30int mgag200_framebuffer_init(struct drm_device *dev,
 31			     struct mga_framebuffer *gfb,
 32			     const 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, &mga_fb_funcs);
 40	if (ret) {
 41		DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
 42		return ret;
 43	}
 44	return 0;
 45}
 46
 47static struct drm_framebuffer *
 48mgag200_user_framebuffer_create(struct drm_device *dev,
 49				struct drm_file *filp,
 50				const struct drm_mode_fb_cmd2 *mode_cmd)
 51{
 52	struct drm_gem_object *obj;
 53	struct mga_framebuffer *mga_fb;
 54	int ret;
 55
 56	obj = drm_gem_object_lookup(filp, mode_cmd->handles[0]);
 57	if (obj == NULL)
 58		return ERR_PTR(-ENOENT);
 59
 60	mga_fb = kzalloc(sizeof(*mga_fb), GFP_KERNEL);
 61	if (!mga_fb) {
 62		drm_gem_object_unreference_unlocked(obj);
 63		return ERR_PTR(-ENOMEM);
 64	}
 65
 66	ret = mgag200_framebuffer_init(dev, mga_fb, mode_cmd, obj);
 67	if (ret) {
 68		drm_gem_object_unreference_unlocked(obj);
 69		kfree(mga_fb);
 70		return ERR_PTR(ret);
 71	}
 72	return &mga_fb->base;
 73}
 74
 75static const struct drm_mode_config_funcs mga_mode_funcs = {
 76	.fb_create = mgag200_user_framebuffer_create,
 77};
 78
 79static int mga_probe_vram(struct mga_device *mdev, void __iomem *mem)
 80{
 81	int offset;
 82	int orig;
 83	int test1, test2;
 84	int orig1, orig2;
 85	unsigned int vram_size;
 86
 87	/* Probe */
 88	orig = ioread16(mem);
 89	iowrite16(0, mem);
 90
 91	vram_size = mdev->mc.vram_window;
 92
 93	if ((mdev->type == G200_EW3) && (vram_size >= 0x1000000)) {
 94		vram_size = vram_size - 0x400000;
 95	}
 96
 97	for (offset = 0x100000; offset < vram_size; offset += 0x4000) {
 98		orig1 = ioread8(mem + offset);
 99		orig2 = ioread8(mem + offset + 0x100);
100
101		iowrite16(0xaa55, mem + offset);
102		iowrite16(0xaa55, mem + offset + 0x100);
103
104		test1 = ioread16(mem + offset);
105		test2 = ioread16(mem);
106
107		iowrite16(orig1, mem + offset);
108		iowrite16(orig2, mem + offset + 0x100);
109
110		if (test1 != 0xaa55) {
111			break;
112		}
113
114		if (test2) {
115			break;
116		}
117	}
118
119	iowrite16(orig, mem);
120	return offset - 65536;
121}
122
123/* Map the framebuffer from the card and configure the core */
124static int mga_vram_init(struct mga_device *mdev)
125{
126	void __iomem *mem;
127	struct apertures_struct *aper = alloc_apertures(1);
128	if (!aper)
129		return -ENOMEM;
130
131	/* BAR 0 is VRAM */
132	mdev->mc.vram_base = pci_resource_start(mdev->dev->pdev, 0);
133	mdev->mc.vram_window = pci_resource_len(mdev->dev->pdev, 0);
134
135	aper->ranges[0].base = mdev->mc.vram_base;
136	aper->ranges[0].size = mdev->mc.vram_window;
137
138	drm_fb_helper_remove_conflicting_framebuffers(aper, "mgafb", true);
139	kfree(aper);
140
141	if (!devm_request_mem_region(mdev->dev->dev, mdev->mc.vram_base, mdev->mc.vram_window,
142				"mgadrmfb_vram")) {
143		DRM_ERROR("can't reserve VRAM\n");
144		return -ENXIO;
145	}
146
147	mem = pci_iomap(mdev->dev->pdev, 0, 0);
148
149	mdev->mc.vram_size = mga_probe_vram(mdev, mem);
150
151	pci_iounmap(mdev->dev->pdev, mem);
152
153	return 0;
154}
155
156static int mgag200_device_init(struct drm_device *dev,
157			       uint32_t flags)
158{
159	struct mga_device *mdev = dev->dev_private;
160	int ret, option;
161
162	mdev->type = flags;
163
164	/* Hardcode the number of CRTCs to 1 */
165	mdev->num_crtc = 1;
166
167	pci_read_config_dword(dev->pdev, PCI_MGA_OPTION, &option);
168	mdev->has_sdram = !(option & (1 << 14));
169
170	/* BAR 0 is the framebuffer, BAR 1 contains registers */
171	mdev->rmmio_base = pci_resource_start(mdev->dev->pdev, 1);
172	mdev->rmmio_size = pci_resource_len(mdev->dev->pdev, 1);
173
174	if (!devm_request_mem_region(mdev->dev->dev, mdev->rmmio_base, mdev->rmmio_size,
175				"mgadrmfb_mmio")) {
176		DRM_ERROR("can't reserve mmio registers\n");
177		return -ENOMEM;
178	}
179
180	mdev->rmmio = pcim_iomap(dev->pdev, 1, 0);
181	if (mdev->rmmio == NULL)
182		return -ENOMEM;
183
184	/* stash G200 SE model number for later use */
185	if (IS_G200_SE(mdev))
186		mdev->unique_rev_id = RREG32(0x1e24);
187
188	ret = mga_vram_init(mdev);
189	if (ret)
190		return ret;
191
192	mdev->bpp_shifts[0] = 0;
193	mdev->bpp_shifts[1] = 1;
194	mdev->bpp_shifts[2] = 0;
195	mdev->bpp_shifts[3] = 2;
196	return 0;
197}
198
199/*
200 * Functions here will be called by the core once it's bound the driver to
201 * a PCI device
202 */
203
204
205int mgag200_driver_load(struct drm_device *dev, unsigned long flags)
206{
207	struct mga_device *mdev;
208	int r;
209
210	mdev = devm_kzalloc(dev->dev, sizeof(struct mga_device), GFP_KERNEL);
211	if (mdev == NULL)
212		return -ENOMEM;
213	dev->dev_private = (void *)mdev;
214	mdev->dev = dev;
215
216	r = mgag200_device_init(dev, flags);
217	if (r) {
218		dev_err(&dev->pdev->dev, "Fatal error during GPU init: %d\n", r);
219		return r;
220	}
221	r = mgag200_mm_init(mdev);
222	if (r)
223		goto err_mm;
224
225	drm_mode_config_init(dev);
226	dev->mode_config.funcs = (void *)&mga_mode_funcs;
227	if (IS_G200_SE(mdev) && mdev->mc.vram_size < (2048*1024))
228		dev->mode_config.preferred_depth = 16;
229	else
230		dev->mode_config.preferred_depth = 24;
231	dev->mode_config.prefer_shadow = 1;
232
233	r = mgag200_modeset_init(mdev);
234	if (r) {
235		dev_err(&dev->pdev->dev, "Fatal error during modeset init: %d\n", r);
236		goto err_modeset;
237	}
238
239	/* Make small buffers to store a hardware cursor (double buffered icon updates) */
240	mgag200_bo_create(dev, roundup(48*64, PAGE_SIZE), 0, 0,
241					  &mdev->cursor.pixels_1);
242	mgag200_bo_create(dev, roundup(48*64, PAGE_SIZE), 0, 0,
243					  &mdev->cursor.pixels_2);
244	if (!mdev->cursor.pixels_2 || !mdev->cursor.pixels_1) {
245		mdev->cursor.pixels_1 = NULL;
246		mdev->cursor.pixels_2 = NULL;
247		dev_warn(&dev->pdev->dev,
248			"Could not allocate space for cursors. Not doing hardware cursors.\n");
249	} else {
250		mdev->cursor.pixels_current = mdev->cursor.pixels_1;
251		mdev->cursor.pixels_prev = mdev->cursor.pixels_2;
252	}
253
254	return 0;
255
256err_modeset:
257	drm_mode_config_cleanup(dev);
258	mgag200_mm_fini(mdev);
259err_mm:
260	dev->dev_private = NULL;
261
262	return r;
263}
264
265int mgag200_driver_unload(struct drm_device *dev)
266{
267	struct mga_device *mdev = dev->dev_private;
268
269	if (mdev == NULL)
270		return 0;
271	mgag200_modeset_fini(mdev);
272	mgag200_fbdev_fini(mdev);
273	drm_mode_config_cleanup(dev);
274	mgag200_mm_fini(mdev);
275	dev->dev_private = NULL;
276	return 0;
277}
278
279int mgag200_gem_create(struct drm_device *dev,
280		   u32 size, bool iskernel,
281		   struct drm_gem_object **obj)
282{
283	struct mgag200_bo *astbo;
284	int ret;
285
286	*obj = NULL;
287
288	size = roundup(size, PAGE_SIZE);
289	if (size == 0)
290		return -EINVAL;
291
292	ret = mgag200_bo_create(dev, size, 0, 0, &astbo);
293	if (ret) {
294		if (ret != -ERESTARTSYS)
295			DRM_ERROR("failed to allocate GEM object\n");
296		return ret;
297	}
298	*obj = &astbo->gem;
299	return 0;
300}
301
302int mgag200_dumb_create(struct drm_file *file,
303		    struct drm_device *dev,
304		    struct drm_mode_create_dumb *args)
305{
306	int ret;
307	struct drm_gem_object *gobj;
308	u32 handle;
309
310	args->pitch = args->width * ((args->bpp + 7) / 8);
311	args->size = args->pitch * args->height;
312
313	ret = mgag200_gem_create(dev, args->size, false,
314			     &gobj);
315	if (ret)
316		return ret;
317
318	ret = drm_gem_handle_create(file, gobj, &handle);
319	drm_gem_object_unreference_unlocked(gobj);
320	if (ret)
321		return ret;
322
323	args->handle = handle;
324	return 0;
325}
326
327static void mgag200_bo_unref(struct mgag200_bo **bo)
328{
329	struct ttm_buffer_object *tbo;
330
331	if ((*bo) == NULL)
332		return;
333
334	tbo = &((*bo)->bo);
335	ttm_bo_unref(&tbo);
336	*bo = NULL;
337}
338
339void mgag200_gem_free_object(struct drm_gem_object *obj)
340{
341	struct mgag200_bo *mgag200_bo = gem_to_mga_bo(obj);
342
343	mgag200_bo_unref(&mgag200_bo);
344}
345
346
347static inline u64 mgag200_bo_mmap_offset(struct mgag200_bo *bo)
348{
349	return drm_vma_node_offset_addr(&bo->bo.vma_node);
350}
351
352int
353mgag200_dumb_mmap_offset(struct drm_file *file,
354		     struct drm_device *dev,
355		     uint32_t handle,
356		     uint64_t *offset)
357{
358	struct drm_gem_object *obj;
359	struct mgag200_bo *bo;
360
361	obj = drm_gem_object_lookup(file, handle);
362	if (obj == NULL)
363		return -ENOENT;
364
365	bo = gem_to_mga_bo(obj);
366	*offset = mgag200_bo_mmap_offset(bo);
367
368	drm_gem_object_unreference_unlocked(obj);
369	return 0;
370}