[deliverable/linux.git] / drivers / gpu / drm / vmwgfx / vmwgfx_ioctl.c

/**************************************************************************
 *
 * Copyright © 2009 VMware, Inc., Palo Alto, CA., USA
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 **************************************************************************/

#include "vmwgfx_drv.h"
#include <drm/vmwgfx_drm.h>
#include "vmwgfx_kms.h"

int vmw_getparam_ioctl(struct drm_device *dev, void *data,
		       struct drm_file *file_priv)
{
	struct vmw_private *dev_priv = vmw_priv(dev);
	struct drm_vmw_getparam_arg *param =
	    (struct drm_vmw_getparam_arg *)data;

	switch (param->param) {
	case DRM_VMW_PARAM_NUM_STREAMS:
		param->value = vmw_overlay_num_overlays(dev_priv);
		break;
	case DRM_VMW_PARAM_NUM_FREE_STREAMS:
		param->value = vmw_overlay_num_free_overlays(dev_priv);
		break;
	case DRM_VMW_PARAM_3D:
		param->value = vmw_fifo_have_3d(dev_priv) ? 1 : 0;
		break;
	case DRM_VMW_PARAM_HW_CAPS:
		param->value = dev_priv->capabilities;
		break;
	case DRM_VMW_PARAM_FIFO_CAPS:
		param->value = dev_priv->fifo.capabilities;
		break;
	case DRM_VMW_PARAM_MAX_FB_SIZE:
		param->value = dev_priv->vram_size;
		break;
	case DRM_VMW_PARAM_FIFO_HW_VERSION:
	{
		__le32 __iomem *fifo_mem = dev_priv->mmio_virt;
		const struct vmw_fifo_state *fifo = &dev_priv->fifo;

		param->value =
			ioread32(fifo_mem +
				 ((fifo->capabilities &
				   SVGA_FIFO_CAP_3D_HWVERSION_REVISED) ?
				  SVGA_FIFO_3D_HWVERSION_REVISED :
				  SVGA_FIFO_3D_HWVERSION));
		break;
	}
	default:
		DRM_ERROR("Illegal vmwgfx get param request: %d\n",
			  param->param);
		return -EINVAL;
	}

	return 0;
}


int vmw_get_cap_3d_ioctl(struct drm_device *dev, void *data,
			 struct drm_file *file_priv)
{
	struct drm_vmw_get_3d_cap_arg *arg =
		(struct drm_vmw_get_3d_cap_arg *) data;
	struct vmw_private *dev_priv = vmw_priv(dev);
	uint32_t size;
	__le32 __iomem *fifo_mem;
	void __user *buffer = (void __user *)((unsigned long)(arg->buffer));
	void *bounce;
	int ret;

	if (unlikely(arg->pad64 != 0)) {
		DRM_ERROR("Illegal GET_3D_CAP argument.\n");
		return -EINVAL;
	}

	size = (SVGA_FIFO_3D_CAPS_LAST - SVGA_FIFO_3D_CAPS + 1) << 2;

	if (arg->max_size < size)
		size = arg->max_size;

	bounce = vmalloc(size);
	if (unlikely(bounce == NULL)) {
		DRM_ERROR("Failed to allocate bounce buffer for 3D caps.\n");
		return -ENOMEM;
	}

	fifo_mem = dev_priv->mmio_virt;
	memcpy_fromio(bounce, &fifo_mem[SVGA_FIFO_3D_CAPS], size);

	ret = copy_to_user(buffer, bounce, size);
	if (ret)
		ret = -EFAULT;
	vfree(bounce);

	if (unlikely(ret != 0))
		DRM_ERROR("Failed to report 3D caps info.\n");

	return ret;
}

int vmw_present_ioctl(struct drm_device *dev, void *data,
		      struct drm_file *file_priv)
{
	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
	struct vmw_private *dev_priv = vmw_priv(dev);
	struct drm_vmw_present_arg *arg =
		(struct drm_vmw_present_arg *)data;
	struct vmw_surface *surface;
	struct vmw_master *vmaster = vmw_master(file_priv->master);
	struct drm_vmw_rect __user *clips_ptr;
	struct drm_vmw_rect *clips = NULL;
	struct drm_framebuffer *fb;
	struct vmw_framebuffer *vfb;
	struct vmw_resource *res;
	uint32_t num_clips;
	int ret;

	num_clips = arg->num_clips;
	clips_ptr = (struct drm_vmw_rect *)(unsigned long)arg->clips_ptr;

	if (unlikely(num_clips == 0))
		return 0;

	if (clips_ptr == NULL) {
		DRM_ERROR("Variable clips_ptr must be specified.\n");
		ret = -EINVAL;
		goto out_clips;
	}

	clips = kcalloc(num_clips, sizeof(*clips), GFP_KERNEL);
	if (clips == NULL) {
		DRM_ERROR("Failed to allocate clip rect list.\n");
		ret = -ENOMEM;
		goto out_clips;
	}

	ret = copy_from_user(clips, clips_ptr, num_clips * sizeof(*clips));
	if (ret) {
		DRM_ERROR("Failed to copy clip rects from userspace.\n");
		ret = -EFAULT;
		goto out_no_copy;
	}

	drm_modeset_lock_all(dev);

	fb = drm_framebuffer_lookup(dev, arg->fb_id);
	if (!fb) {
		DRM_ERROR("Invalid framebuffer id.\n");
		ret = -EINVAL;
		goto out_no_fb;
	}
	vfb = vmw_framebuffer_to_vfb(fb);

	ret = ttm_read_lock(&vmaster->lock, true);
	if (unlikely(ret != 0))
		goto out_no_ttm_lock;

	ret = vmw_user_resource_lookup_handle(dev_priv, tfile, arg->sid,
					      user_surface_converter,
					      &res);
	if (ret)
		goto out_no_surface;

	surface = vmw_res_to_srf(res);
	ret = vmw_kms_present(dev_priv, file_priv,
			      vfb, surface, arg->sid,
			      arg->dest_x, arg->dest_y,
			      clips, num_clips);

	/* vmw_user_surface_lookup takes one ref so does new_fb */
	vmw_surface_unreference(&surface);

out_no_surface:
	ttm_read_unlock(&vmaster->lock);
out_no_ttm_lock:
	drm_framebuffer_unreference(fb);
out_no_fb:
	drm_modeset_unlock_all(dev);
out_no_copy:
	kfree(clips);
out_clips:
	return ret;
}

int vmw_present_readback_ioctl(struct drm_device *dev, void *data,
			       struct drm_file *file_priv)
{
	struct vmw_private *dev_priv = vmw_priv(dev);
	struct drm_vmw_present_readback_arg *arg =
		(struct drm_vmw_present_readback_arg *)data;
	struct drm_vmw_fence_rep __user *user_fence_rep =
		(struct drm_vmw_fence_rep __user *)
		(unsigned long)arg->fence_rep;
	struct vmw_master *vmaster = vmw_master(file_priv->master);
	struct drm_vmw_rect __user *clips_ptr;
	struct drm_vmw_rect *clips = NULL;
	struct drm_framebuffer *fb;
	struct vmw_framebuffer *vfb;
	uint32_t num_clips;
	int ret;

	num_clips = arg->num_clips;
	clips_ptr = (struct drm_vmw_rect *)(unsigned long)arg->clips_ptr;

	if (unlikely(num_clips == 0))
		return 0;

	if (clips_ptr == NULL) {
		DRM_ERROR("Argument clips_ptr must be specified.\n");
		ret = -EINVAL;
		goto out_clips;
	}

	clips = kcalloc(num_clips, sizeof(*clips), GFP_KERNEL);
	if (clips == NULL) {
		DRM_ERROR("Failed to allocate clip rect list.\n");
		ret = -ENOMEM;
		goto out_clips;
	}

	ret = copy_from_user(clips, clips_ptr, num_clips * sizeof(*clips));
	if (ret) {
		DRM_ERROR("Failed to copy clip rects from userspace.\n");
		ret = -EFAULT;
		goto out_no_copy;
	}

	drm_modeset_lock_all(dev);

	fb = drm_framebuffer_lookup(dev, arg->fb_id);
	if (!fb) {
		DRM_ERROR("Invalid framebuffer id.\n");
		ret = -EINVAL;
		goto out_no_fb;
	}

	vfb = vmw_framebuffer_to_vfb(fb);
	if (!vfb->dmabuf) {
		DRM_ERROR("Framebuffer not dmabuf backed.\n");
		ret = -EINVAL;
		goto out_no_ttm_lock;
	}

	ret = ttm_read_lock(&vmaster->lock, true);
	if (unlikely(ret != 0))
		goto out_no_ttm_lock;

	ret = vmw_kms_readback(dev_priv, file_priv,
			       vfb, user_fence_rep,
			       clips, num_clips);

	ttm_read_unlock(&vmaster->lock);
out_no_ttm_lock:
	drm_framebuffer_unreference(fb);
out_no_fb:
	drm_modeset_unlock_all(dev);
out_no_copy:
	kfree(clips);
out_clips:
	return ret;
}


/**
 * vmw_fops_poll - wrapper around the drm_poll function
 *
 * @filp: See the linux fops poll documentation.
 * @wait: See the linux fops poll documentation.
 *
 * Wrapper around the drm_poll function that makes sure the device is
 * processing the fifo if drm_poll decides to wait.
 */
unsigned int vmw_fops_poll(struct file *filp, struct poll_table_struct *wait)
{
	struct drm_file *file_priv = filp->private_data;
	struct vmw_private *dev_priv =
		vmw_priv(file_priv->minor->dev);

	vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
	return drm_poll(filp, wait);
}


/**
 * vmw_fops_read - wrapper around the drm_read function
 *
 * @filp: See the linux fops read documentation.
 * @buffer: See the linux fops read documentation.
 * @count: See the linux fops read documentation.
 * offset: See the linux fops read documentation.
 *
 * Wrapper around the drm_read function that makes sure the device is
 * processing the fifo if drm_read decides to wait.
 */
ssize_t vmw_fops_read(struct file *filp, char __user *buffer,
		      size_t count, loff_t *offset)
{
	struct drm_file *file_priv = filp->private_data;
	struct vmw_private *dev_priv =
		vmw_priv(file_priv->minor->dev);

	vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
	return drm_read(filp, buffer, count, offset);
}
Commit	Line	Data
fb1d9738 JB	1	/**************************************************************************
	2	*
	3	* Copyright © 2009 VMware, Inc., Palo Alto, CA., USA
	4	* All Rights Reserved.
	5	*
	6	* Permission is hereby granted, free of charge, to any person obtaining a
	7	* copy of this software and associated documentation files (the
	8	* "Software"), to deal in the Software without restriction, including
	9	* without limitation the rights to use, copy, modify, merge, publish,
	10	* distribute, sub license, and/or sell copies of the Software, and to
	11	* permit persons to whom the Software is furnished to do so, subject to
	12	* the following conditions:
	13	*
	14	* The above copyright notice and this permission notice (including the
	15	* next paragraph) shall be included in all copies or substantial portions
	16	* of the Software.
	17	*
	18	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	19	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	20	* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
	21	* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
	22	* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
	23	* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
	24	* USE OR OTHER DEALINGS IN THE SOFTWARE.
	25	*
	26	**************************************************************************/
	27
	28	#include "vmwgfx_drv.h"
760285e7	29	#include <drm/vmwgfx_drm.h>
2fcd5a73	30	#include "vmwgfx_kms.h"
fb1d9738 JB	31
	32	int vmw_getparam_ioctl(struct drm_device dev, void data,
	33	struct drm_file *file_priv)
	34	{
	35	struct vmw_private *dev_priv = vmw_priv(dev);
	36	struct drm_vmw_getparam_arg *param =
	37	(struct drm_vmw_getparam_arg *)data;
	38
	39	switch (param->param) {
	40	case DRM_VMW_PARAM_NUM_STREAMS:
	41	param->value = vmw_overlay_num_overlays(dev_priv);
	42	break;
	43	case DRM_VMW_PARAM_NUM_FREE_STREAMS:
	44	param->value = vmw_overlay_num_free_overlays(dev_priv);
	45	break;
	46	case DRM_VMW_PARAM_3D:
8e19a951	47	param->value = vmw_fifo_have_3d(dev_priv) ? 1 : 0;
fb1d9738	48	break;
f77cef3d TH	49	case DRM_VMW_PARAM_HW_CAPS:
	50	param->value = dev_priv->capabilities;
	51	break;
	52	case DRM_VMW_PARAM_FIFO_CAPS:
	53	param->value = dev_priv->fifo.capabilities;
	54	break;
30f47fc8 TH	55	case DRM_VMW_PARAM_MAX_FB_SIZE:
	56	param->value = dev_priv->vram_size;
	57	break;
f63f6a59 TH	58	case DRM_VMW_PARAM_FIFO_HW_VERSION:
	59	{
	60	__le32 __iomem *fifo_mem = dev_priv->mmio_virt;
ebd4c6f6	61	const struct vmw_fifo_state *fifo = &dev_priv->fifo;
f63f6a59	62
ebd4c6f6 TH	63	param->value =
	64	ioread32(fifo_mem +
	65	((fifo->capabilities &
	66	SVGA_FIFO_CAP_3D_HWVERSION_REVISED) ?
	67	SVGA_FIFO_3D_HWVERSION_REVISED :
	68	SVGA_FIFO_3D_HWVERSION));
f63f6a59 TH	69	break;
f63f6a59 TH	70	}
fb1d9738 JB	71	default:
	72	DRM_ERROR("Illegal vmwgfx get param request: %d\n",
	73	param->param);
	74	return -EINVAL;
	75	}
	76
	77	return 0;
	78	}
f63f6a59 TH	79
	80
	81	int vmw_get_cap_3d_ioctl(struct drm_device dev, void data,
	82	struct drm_file *file_priv)
	83	{
	84	struct drm_vmw_get_3d_cap_arg *arg =
	85	(struct drm_vmw_get_3d_cap_arg *) data;
	86	struct vmw_private *dev_priv = vmw_priv(dev);
	87	uint32_t size;
	88	__le32 __iomem *fifo_mem;
	89	void __user buffer = (void __user )((unsigned long)(arg->buffer));
	90	void *bounce;
	91	int ret;
	92
	93	if (unlikely(arg->pad64 != 0)) {
	94	DRM_ERROR("Illegal GET_3D_CAP argument.\n");
	95	return -EINVAL;
	96	}
	97
	98	size = (SVGA_FIFO_3D_CAPS_LAST - SVGA_FIFO_3D_CAPS + 1) << 2;
	99
	100	if (arg->max_size < size)
	101	size = arg->max_size;
	102
	103	bounce = vmalloc(size);
	104	if (unlikely(bounce == NULL)) {
	105	DRM_ERROR("Failed to allocate bounce buffer for 3D caps.\n");
	106	return -ENOMEM;
	107	}
	108
	109	fifo_mem = dev_priv->mmio_virt;
	110	memcpy_fromio(bounce, &fifo_mem[SVGA_FIFO_3D_CAPS], size);
	111
	112	ret = copy_to_user(buffer, bounce, size);
888155bb DC	113	if (ret)
888155bb DC	114	ret = -EFAULT;
f63f6a59 TH	115	vfree(bounce);
	116
	117	if (unlikely(ret != 0))
	118	DRM_ERROR("Failed to report 3D caps info.\n");
	119
	120	return ret;
	121	}
2fcd5a73 JB	122
	123	int vmw_present_ioctl(struct drm_device dev, void data,
	124	struct drm_file *file_priv)
	125	{
	126	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
	127	struct vmw_private *dev_priv = vmw_priv(dev);
	128	struct drm_vmw_present_arg *arg =
	129	(struct drm_vmw_present_arg *)data;
	130	struct vmw_surface *surface;
	131	struct vmw_master *vmaster = vmw_master(file_priv->master);
	132	struct drm_vmw_rect __user *clips_ptr;
	133	struct drm_vmw_rect *clips = NULL;
786b99ed	134	struct drm_framebuffer *fb;
2fcd5a73	135	struct vmw_framebuffer *vfb;
c0951b79	136	struct vmw_resource *res;
2fcd5a73 JB	137	uint32_t num_clips;
	138	int ret;
	139
	140	num_clips = arg->num_clips;
	141	clips_ptr = (struct drm_vmw_rect *)(unsigned long)arg->clips_ptr;
	142
	143	if (unlikely(num_clips == 0))
	144	return 0;
	145
	146	if (clips_ptr == NULL) {
	147	DRM_ERROR("Variable clips_ptr must be specified.\n");
	148	ret = -EINVAL;
	149	goto out_clips;
	150	}
	151
24bb5a0c	152	clips = kcalloc(num_clips, sizeof(*clips), GFP_KERNEL);
2fcd5a73 JB	153	if (clips == NULL) {
	154	DRM_ERROR("Failed to allocate clip rect list.\n");
	155	ret = -ENOMEM;
	156	goto out_clips;
	157	}
	158
	159	ret = copy_from_user(clips, clips_ptr, num_clips * sizeof(*clips));
	160	if (ret) {
	161	DRM_ERROR("Failed to copy clip rects from userspace.\n");
d2c184fb	162	ret = -EFAULT;
2fcd5a73 JB	163	goto out_no_copy;
	164	}
	165
bbe4b99f	166	drm_modeset_lock_all(dev);
2fcd5a73	167
786b99ed DV	168	fb = drm_framebuffer_lookup(dev, arg->fb_id);
786b99ed DV	169	if (!fb) {
2fcd5a73 JB	170	DRM_ERROR("Invalid framebuffer id.\n");
	171	ret = -EINVAL;
	172	goto out_no_fb;
	173	}
786b99ed	174	vfb = vmw_framebuffer_to_vfb(fb);
2fcd5a73 JB	175
	176	ret = ttm_read_lock(&vmaster->lock, true);
	177	if (unlikely(ret != 0))
	178	goto out_no_ttm_lock;
	179
c0951b79 TH	180	ret = vmw_user_resource_lookup_handle(dev_priv, tfile, arg->sid,
	181	user_surface_converter,
	182	&res);
2fcd5a73 JB	183	if (ret)
	184	goto out_no_surface;
	185
c0951b79	186	surface = vmw_res_to_srf(res);
2fcd5a73 JB	187	ret = vmw_kms_present(dev_priv, file_priv,
	188	vfb, surface, arg->sid,
	189	arg->dest_x, arg->dest_y,
	190	clips, num_clips);
	191
	192	/* vmw_user_surface_lookup takes one ref so does new_fb */
	193	vmw_surface_unreference(&surface);
	194
	195	out_no_surface:
	196	ttm_read_unlock(&vmaster->lock);
	197	out_no_ttm_lock:
2fd5eaba	198	drm_framebuffer_unreference(fb);
2fcd5a73	199	out_no_fb:
bbe4b99f	200	drm_modeset_unlock_all(dev);
2fcd5a73 JB	201	out_no_copy:
	202	kfree(clips);
	203	out_clips:
	204	return ret;
	205	}
	206
	207	int vmw_present_readback_ioctl(struct drm_device dev, void data,
	208	struct drm_file *file_priv)
	209	{
	210	struct vmw_private *dev_priv = vmw_priv(dev);
	211	struct drm_vmw_present_readback_arg *arg =
	212	(struct drm_vmw_present_readback_arg *)data;
	213	struct drm_vmw_fence_rep __user *user_fence_rep =
	214	(struct drm_vmw_fence_rep __user *)
	215	(unsigned long)arg->fence_rep;
	216	struct vmw_master *vmaster = vmw_master(file_priv->master);
	217	struct drm_vmw_rect __user *clips_ptr;
	218	struct drm_vmw_rect *clips = NULL;
786b99ed	219	struct drm_framebuffer *fb;
2fcd5a73 JB	220	struct vmw_framebuffer *vfb;
	221	uint32_t num_clips;
	222	int ret;
	223
	224	num_clips = arg->num_clips;
	225	clips_ptr = (struct drm_vmw_rect *)(unsigned long)arg->clips_ptr;
	226
	227	if (unlikely(num_clips == 0))
	228	return 0;
	229
	230	if (clips_ptr == NULL) {
	231	DRM_ERROR("Argument clips_ptr must be specified.\n");
	232	ret = -EINVAL;
	233	goto out_clips;
	234	}
	235
24bb5a0c	236	clips = kcalloc(num_clips, sizeof(*clips), GFP_KERNEL);
2fcd5a73 JB	237	if (clips == NULL) {
	238	DRM_ERROR("Failed to allocate clip rect list.\n");
	239	ret = -ENOMEM;
	240	goto out_clips;
	241	}
	242
	243	ret = copy_from_user(clips, clips_ptr, num_clips * sizeof(*clips));
	244	if (ret) {
	245	DRM_ERROR("Failed to copy clip rects from userspace.\n");
d2c184fb	246	ret = -EFAULT;
2fcd5a73 JB	247	goto out_no_copy;
	248	}
	249
bbe4b99f	250	drm_modeset_lock_all(dev);
2fcd5a73	251
786b99ed DV	252	fb = drm_framebuffer_lookup(dev, arg->fb_id);
786b99ed DV	253	if (!fb) {
2fcd5a73 JB	254	DRM_ERROR("Invalid framebuffer id.\n");
	255	ret = -EINVAL;
	256	goto out_no_fb;
	257	}
	258
786b99ed	259	vfb = vmw_framebuffer_to_vfb(fb);
2fcd5a73 JB	260	if (!vfb->dmabuf) {
	261	DRM_ERROR("Framebuffer not dmabuf backed.\n");
	262	ret = -EINVAL;
2fd5eaba	263	goto out_no_ttm_lock;
2fcd5a73 JB	264	}
	265
	266	ret = ttm_read_lock(&vmaster->lock, true);
	267	if (unlikely(ret != 0))
	268	goto out_no_ttm_lock;
	269
	270	ret = vmw_kms_readback(dev_priv, file_priv,
	271	vfb, user_fence_rep,
	272	clips, num_clips);
	273
	274	ttm_read_unlock(&vmaster->lock);
	275	out_no_ttm_lock:
2fd5eaba	276	drm_framebuffer_unreference(fb);
2fcd5a73	277	out_no_fb:
bbe4b99f	278	drm_modeset_unlock_all(dev);
2fcd5a73 JB	279	out_no_copy:
	280	kfree(clips);
	281	out_clips:
	282	return ret;
	283	}
5438ae88 TH	284
	285
	286	/**
	287	* vmw_fops_poll - wrapper around the drm_poll function
	288	*
	289	* @filp: See the linux fops poll documentation.
	290	* @wait: See the linux fops poll documentation.
	291	*
	292	* Wrapper around the drm_poll function that makes sure the device is
	293	* processing the fifo if drm_poll decides to wait.
	294	*/
	295	unsigned int vmw_fops_poll(struct file filp, struct poll_table_struct wait)
	296	{
	297	struct drm_file *file_priv = filp->private_data;
	298	struct vmw_private *dev_priv =
	299	vmw_priv(file_priv->minor->dev);
	300
	301	vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
	302	return drm_poll(filp, wait);
	303	}
	304
	305
	306	/**
	307	* vmw_fops_read - wrapper around the drm_read function
	308	*
	309	* @filp: See the linux fops read documentation.
	310	* @buffer: See the linux fops read documentation.
	311	* @count: See the linux fops read documentation.
	312	* offset: See the linux fops read documentation.
	313	*
	314	* Wrapper around the drm_read function that makes sure the device is
	315	* processing the fifo if drm_read decides to wait.
	316	*/
	317	ssize_t vmw_fops_read(struct file filp, char __user buffer,
	318	size_t count, loff_t *offset)
	319	{
	320	struct drm_file *file_priv = filp->private_data;
	321	struct vmw_private *dev_priv =
	322	vmw_priv(file_priv->minor->dev);
	323
	324	vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
	325	return drm_read(filp, buffer, count, offset);
	326	}