drivers/char/drm/drm_drawable.c - linux - Git at Google

 /**
  * \file drm_drawable.c
  * IOCTLs for drawables
  *
  * \author Rickard E. (Rik) Faith <faith@valinux.com>
  * \author Gareth Hughes <gareth@valinux.com>
  * \author Michel Dänzer <michel@tungstengraphics.com>
  */

 /*
  * Created: Tue Feb  2 08:37:54 1999 by faith@valinux.com
  *
  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  * Copyright 2006 Tungsten Graphics, Inc., Bismarck, North Dakota.
  * 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, sublicense,
  * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
  * VA LINUX SYSTEMS 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 "drmP.h"

 /**
  * Allocate drawable ID and memory to store information about it.
  */
 int drm_adddraw(DRM_IOCTL_ARGS)
 {
 	DRM_DEVICE;
 	unsigned long irqflags;
 	int i, j;
 	u32 *bitfield = dev->drw_bitfield;
 	unsigned int bitfield_length = dev->drw_bitfield_length;
 	struct drm_drawable_info **info = dev->drw_info;
 	unsigned int info_length = dev->drw_info_length;
 	struct drm_draw draw;

 	for (i = 0, j = 0; i < bitfield_length; i++) {
 		if (bitfield[i] == ~0)
 			continue;

 		for (; j < 8 * sizeof(*bitfield); j++)
 			if (!(bitfield[i] & (1 << j)))
 				goto done;
 	}
 done:

 	if (i == bitfield_length) {
 		bitfield_length++;

 		bitfield = drm_alloc(bitfield_length * sizeof(*bitfield),
 				     DRM_MEM_BUFS);

 		if (!bitfield) {
 			DRM_ERROR("Failed to allocate new drawable bitfield\n");
 			return DRM_ERR(ENOMEM);
 		}

 		if (8 * sizeof(*bitfield) * bitfield_length > info_length) {
 			info_length += 8 * sizeof(*bitfield);

 			info = drm_alloc(info_length * sizeof(*info),
 					 DRM_MEM_BUFS);

 			if (!info) {
 				DRM_ERROR("Failed to allocate new drawable info"
 					  " array\n");

 				drm_free(bitfield,
 					 bitfield_length * sizeof(*bitfield),
 					 DRM_MEM_BUFS);
 				return DRM_ERR(ENOMEM);
 			}
 		}

 		bitfield[i] = 0;
 	}

 	draw.handle = i * 8 * sizeof(*bitfield) + j + 1;
 	DRM_DEBUG("%d\n", draw.handle);

 	spin_lock_irqsave(&dev->drw_lock, irqflags);

 	bitfield[i] |= 1 << j;
 	info[draw.handle - 1] = NULL;

 	if (bitfield != dev->drw_bitfield) {
 		memcpy(bitfield, dev->drw_bitfield, dev->drw_bitfield_length *
 		       sizeof(*bitfield));
 		drm_free(dev->drw_bitfield, sizeof(*bitfield) *
 			 dev->drw_bitfield_length, DRM_MEM_BUFS);
 		dev->drw_bitfield = bitfield;
 		dev->drw_bitfield_length = bitfield_length;
 	}

 	if (info != dev->drw_info) {
 		memcpy(info, dev->drw_info, dev->drw_info_length *
 		       sizeof(*info));
 		drm_free(dev->drw_info, sizeof(*info) * dev->drw_info_length,
 			 DRM_MEM_BUFS);
 		dev->drw_info = info;
 		dev->drw_info_length = info_length;
 	}

 	spin_unlock_irqrestore(&dev->drw_lock, irqflags);

 	DRM_COPY_TO_USER_IOCTL((struct drm_draw __user *)data, draw, sizeof(draw));

 	return 0;
 }

 /**
  * Free drawable ID and memory to store information about it.
  */
 int drm_rmdraw(DRM_IOCTL_ARGS)
 {
 	DRM_DEVICE;
 	struct drm_draw draw;
  	int id, idx;
  	unsigned int shift;
 	unsigned long irqflags;
 	u32 *bitfield = dev->drw_bitfield;
 	unsigned int bitfield_length = dev->drw_bitfield_length;
 	struct drm_drawable_info **info = dev->drw_info;
 	unsigned int info_length = dev->drw_info_length;

 	DRM_COPY_FROM_USER_IOCTL(draw, (struct drm_draw __user *) data,
 				 sizeof(draw));

 	id = draw.handle - 1;
 	idx = id / (8 * sizeof(*bitfield));
 	shift = id % (8 * sizeof(*bitfield));

 	if (idx < 0 || idx >= bitfield_length ||
 	    !(bitfield[idx] & (1 << shift))) {
 		DRM_DEBUG("No such drawable %d\n", draw.handle);
 		return 0;
 	}

 	spin_lock_irqsave(&dev->drw_lock, irqflags);

 	bitfield[idx] &= ~(1 << shift);

 	spin_unlock_irqrestore(&dev->drw_lock, irqflags);

 	if (info[id]) {
 		drm_free(info[id]->rects, info[id]->num_rects *
 			 sizeof(struct drm_clip_rect), DRM_MEM_BUFS);
 		drm_free(info[id], sizeof(**info), DRM_MEM_BUFS);
 	}

 	/* Can we shrink the arrays? */
 	if (idx == bitfield_length - 1) {
 		while (idx >= 0 && !bitfield[idx])
 			--idx;

 		bitfield_length = idx + 1;

 		bitfield = NULL;

 		if (bitfield_length) {
 			if (bitfield_length != dev->drw_bitfield_length)
 				bitfield = drm_alloc(bitfield_length *
 						     sizeof(*bitfield),
 						     DRM_MEM_BUFS);

 			if (!bitfield) {
 				bitfield = dev->drw_bitfield;
 				bitfield_length = dev->drw_bitfield_length;
 			}
 		}
 	}

 	if (bitfield != dev->drw_bitfield) {
 		info_length = 8 * sizeof(*bitfield) * bitfield_length;

 		if (info_length) {
 			info = drm_alloc(info_length * sizeof(*info),
 					 DRM_MEM_BUFS);

 			if (!info) {
 				info = dev->drw_info;
 				info_length = dev->drw_info_length;
 			}
 		} else
 			info = NULL;

 		spin_lock_irqsave(&dev->drw_lock, irqflags);

 		if (bitfield)
 			memcpy(bitfield, dev->drw_bitfield, bitfield_length *
 			       sizeof(*bitfield));
 		drm_free(dev->drw_bitfield, sizeof(*bitfield) *
 			 dev->drw_bitfield_length, DRM_MEM_BUFS);
 		dev->drw_bitfield = bitfield;
 		dev->drw_bitfield_length = bitfield_length;

 		if (info != dev->drw_info) {
 			if (info)
 				memcpy(info, dev->drw_info, info_length *
 				       sizeof(*info));
 			drm_free(dev->drw_info, sizeof(*info) *
 				 dev->drw_info_length, DRM_MEM_BUFS);
 			dev->drw_info = info;
 			dev->drw_info_length = info_length;
 		}

 		spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 	}

 	DRM_DEBUG("%d\n", draw.handle);
 	return 0;
 }

 int drm_update_drawable_info(DRM_IOCTL_ARGS) {
 	DRM_DEVICE;
 	struct drm_update_draw update;
 	unsigned int id, idx, shift;
 	u32 *bitfield = dev->drw_bitfield;
 	unsigned long irqflags, bitfield_length = dev->drw_bitfield_length;
 	struct drm_drawable_info *info;
 	struct drm_clip_rect *rects;
 	int err;

 	DRM_COPY_FROM_USER_IOCTL(update, (struct drm_update_draw __user *) data,
 				 sizeof(update));

 	id = update.handle - 1;
 	idx = id / (8 * sizeof(*bitfield));
 	shift = id % (8 * sizeof(*bitfield));

 	if (idx < 0 || idx >= bitfield_length ||
 	    !(bitfield[idx] & (1 << shift))) {
 		DRM_ERROR("No such drawable %d\n", update.handle);
 		return DRM_ERR(EINVAL);
 	}

 	info = dev->drw_info[id];

 	if (!info) {
 		info = drm_calloc(1, sizeof(struct drm_drawable_info), DRM_MEM_BUFS);

 		if (!info) {
 			DRM_ERROR("Failed to allocate drawable info memory\n");
 			return DRM_ERR(ENOMEM);
 		}
 	}

 	switch (update.type) {
 	case DRM_DRAWABLE_CLIPRECTS:
 		if (update.num != info->num_rects) {
 			rects = drm_alloc(update.num * sizeof(struct drm_clip_rect),
 					 DRM_MEM_BUFS);
 		} else
 			rects = info->rects;

 		if (update.num && !rects) {
 			DRM_ERROR("Failed to allocate cliprect memory\n");
 			err = DRM_ERR(ENOMEM);
 			goto error;
 		}

 		if (update.num && DRM_COPY_FROM_USER(rects,
 						     (struct drm_clip_rect __user *)
 						     (unsigned long)update.data,
 						     update.num *
 						     sizeof(*rects))) {
 			DRM_ERROR("Failed to copy cliprects from userspace\n");
 			err = DRM_ERR(EFAULT);
 			goto error;
 		}

 		spin_lock_irqsave(&dev->drw_lock, irqflags);

 		if (rects != info->rects) {
 			drm_free(info->rects, info->num_rects *
 				 sizeof(struct drm_clip_rect), DRM_MEM_BUFS);
 		}

 		info->rects = rects;
 		info->num_rects = update.num;
 		dev->drw_info[id] = info;

 		spin_unlock_irqrestore(&dev->drw_lock, irqflags);

 		DRM_DEBUG("Updated %d cliprects for drawable %d\n",
 			  info->num_rects, id);
 		break;
 	default:
 		DRM_ERROR("Invalid update type %d\n", update.type);
 		return DRM_ERR(EINVAL);
 	}

 	return 0;

 error:
 	if (!dev->drw_info[id])
 		drm_free(info, sizeof(*info), DRM_MEM_BUFS);
 	else if (rects != dev->drw_info[id]->rects)
 		drm_free(rects, update.num *
 			 sizeof(struct drm_clip_rect), DRM_MEM_BUFS);

 	return err;
 }

 /**
  * Caller must hold the drawable spinlock!
  */
 struct drm_drawable_info *drm_get_drawable_info(drm_device_t *dev, drm_drawable_t id) {
 	u32 *bitfield = dev->drw_bitfield;
 	unsigned int idx, shift;

 	id--;
 	idx = id / (8 * sizeof(*bitfield));
 	shift = id % (8 * sizeof(*bitfield));

 	if (idx < 0 || idx >= dev->drw_bitfield_length ||
 	    !(bitfield[idx] & (1 << shift))) {
 		DRM_DEBUG("No such drawable %d\n", id);
 		return NULL;
 	}

 	return dev->drw_info[id];
 }
 EXPORT_SYMBOL(drm_get_drawable_info);
	/**
	* \file drm_drawable.c
	* IOCTLs for drawables
	*
	* \author Rickard E. (Rik) Faith <faith@valinux.com>
	* \author Gareth Hughes <gareth@valinux.com>
	* \author Michel Dänzer <michel@tungstengraphics.com>
	*/

	/*
	* Created: Tue Feb 2 08:37:54 1999 by faith@valinux.com
	*
	* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
	* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
	* Copyright 2006 Tungsten Graphics, Inc., Bismarck, North Dakota.
	* 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, sublicense,
	* 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 NONINFRINGEMENT. IN NO EVENT SHALL
	* VA LINUX SYSTEMS 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 "drmP.h"

	/**
	* Allocate drawable ID and memory to store information about it.
	*/
	int drm_adddraw(DRM_IOCTL_ARGS)
	{
	DRM_DEVICE;
	unsigned long irqflags;
	int i, j;
	u32 *bitfield = dev->drw_bitfield;
	unsigned int bitfield_length = dev->drw_bitfield_length;
	struct drm_drawable_info **info = dev->drw_info;
	unsigned int info_length = dev->drw_info_length;
	struct drm_draw draw;

	for (i = 0, j = 0; i < bitfield_length; i++) {
	if (bitfield[i] == ~0)
	continue;

	for (; j < 8 * sizeof(*bitfield); j++)
	if (!(bitfield[i] & (1 << j)))
	goto done;
	}
	done:

	if (i == bitfield_length) {
	bitfield_length++;

	bitfield = drm_alloc(bitfield_length * sizeof(*bitfield),
	DRM_MEM_BUFS);

	if (!bitfield) {
	DRM_ERROR("Failed to allocate new drawable bitfield\n");
	return DRM_ERR(ENOMEM);
	}

	if (8 * sizeof(bitfield) bitfield_length > info_length) {
	info_length += 8 * sizeof(*bitfield);

	info = drm_alloc(info_length * sizeof(*info),
	DRM_MEM_BUFS);

	if (!info) {
	DRM_ERROR("Failed to allocate new drawable info"
	" array\n");

	drm_free(bitfield,
	bitfield_length * sizeof(*bitfield),
	DRM_MEM_BUFS);
	return DRM_ERR(ENOMEM);
	}
	}

	bitfield[i] = 0;
	}

	draw.handle = i * 8 * sizeof(*bitfield) + j + 1;
	DRM_DEBUG("%d\n", draw.handle);

	spin_lock_irqsave(&dev->drw_lock, irqflags);

	bitfield[i] \|= 1 << j;
	info[draw.handle - 1] = NULL;

	if (bitfield != dev->drw_bitfield) {
	memcpy(bitfield, dev->drw_bitfield, dev->drw_bitfield_length *
	sizeof(*bitfield));
	drm_free(dev->drw_bitfield, sizeof(bitfield)
	dev->drw_bitfield_length, DRM_MEM_BUFS);
	dev->drw_bitfield = bitfield;
	dev->drw_bitfield_length = bitfield_length;
	}

	if (info != dev->drw_info) {
	memcpy(info, dev->drw_info, dev->drw_info_length *
	sizeof(*info));
	drm_free(dev->drw_info, sizeof(info) dev->drw_info_length,
	DRM_MEM_BUFS);
	dev->drw_info = info;
	dev->drw_info_length = info_length;
	}

	spin_unlock_irqrestore(&dev->drw_lock, irqflags);

	DRM_COPY_TO_USER_IOCTL((struct drm_draw __user *)data, draw, sizeof(draw));

	return 0;
	}

	/**
	* Free drawable ID and memory to store information about it.
	*/
	int drm_rmdraw(DRM_IOCTL_ARGS)
	{
	DRM_DEVICE;
	struct drm_draw draw;
	int id, idx;
	unsigned int shift;
	unsigned long irqflags;
	u32 *bitfield = dev->drw_bitfield;
	unsigned int bitfield_length = dev->drw_bitfield_length;
	struct drm_drawable_info **info = dev->drw_info;
	unsigned int info_length = dev->drw_info_length;

	DRM_COPY_FROM_USER_IOCTL(draw, (struct drm_draw __user *) data,
	sizeof(draw));

	id = draw.handle - 1;
	idx = id / (8 * sizeof(*bitfield));
	shift = id % (8 * sizeof(*bitfield));

	if (idx < 0 \|\| idx >= bitfield_length \|\|
	!(bitfield[idx] & (1 << shift))) {
	DRM_DEBUG("No such drawable %d\n", draw.handle);
	return 0;
	}

	spin_lock_irqsave(&dev->drw_lock, irqflags);

	bitfield[idx] &= ~(1 << shift);

	spin_unlock_irqrestore(&dev->drw_lock, irqflags);

	if (info[id]) {
	drm_free(info[id]->rects, info[id]->num_rects *
	sizeof(struct drm_clip_rect), DRM_MEM_BUFS);
	drm_free(info[id], sizeof(**info), DRM_MEM_BUFS);
	}

	/* Can we shrink the arrays? */
	if (idx == bitfield_length - 1) {
	while (idx >= 0 && !bitfield[idx])
	--idx;

	bitfield_length = idx + 1;

	bitfield = NULL;

	if (bitfield_length) {
	if (bitfield_length != dev->drw_bitfield_length)
	bitfield = drm_alloc(bitfield_length *
	sizeof(*bitfield),
	DRM_MEM_BUFS);

	if (!bitfield) {
	bitfield = dev->drw_bitfield;
	bitfield_length = dev->drw_bitfield_length;
	}
	}
	}

	if (bitfield != dev->drw_bitfield) {
	info_length = 8 * sizeof(bitfield) bitfield_length;

	if (info_length) {
	info = drm_alloc(info_length * sizeof(*info),
	DRM_MEM_BUFS);

	if (!info) {
	info = dev->drw_info;
	info_length = dev->drw_info_length;
	}
	} else
	info = NULL;

	spin_lock_irqsave(&dev->drw_lock, irqflags);

	if (bitfield)
	memcpy(bitfield, dev->drw_bitfield, bitfield_length *
	sizeof(*bitfield));
	drm_free(dev->drw_bitfield, sizeof(bitfield)
	dev->drw_bitfield_length, DRM_MEM_BUFS);
	dev->drw_bitfield = bitfield;
	dev->drw_bitfield_length = bitfield_length;

	if (info != dev->drw_info) {
	if (info)
	memcpy(info, dev->drw_info, info_length *
	sizeof(*info));
	drm_free(dev->drw_info, sizeof(info)
	dev->drw_info_length, DRM_MEM_BUFS);
	dev->drw_info = info;
	dev->drw_info_length = info_length;
	}

	spin_unlock_irqrestore(&dev->drw_lock, irqflags);
	}

	DRM_DEBUG("%d\n", draw.handle);
	return 0;
	}

	int drm_update_drawable_info(DRM_IOCTL_ARGS) {
	DRM_DEVICE;
	struct drm_update_draw update;
	unsigned int id, idx, shift;
	u32 *bitfield = dev->drw_bitfield;
	unsigned long irqflags, bitfield_length = dev->drw_bitfield_length;
	struct drm_drawable_info *info;
	struct drm_clip_rect *rects;
	int err;

	DRM_COPY_FROM_USER_IOCTL(update, (struct drm_update_draw __user *) data,
	sizeof(update));

	id = update.handle - 1;
	idx = id / (8 * sizeof(*bitfield));
	shift = id % (8 * sizeof(*bitfield));

	if (idx < 0 \|\| idx >= bitfield_length \|\|
	!(bitfield[idx] & (1 << shift))) {
	DRM_ERROR("No such drawable %d\n", update.handle);
	return DRM_ERR(EINVAL);
	}

	info = dev->drw_info[id];

	if (!info) {
	info = drm_calloc(1, sizeof(struct drm_drawable_info), DRM_MEM_BUFS);

	if (!info) {
	DRM_ERROR("Failed to allocate drawable info memory\n");
	return DRM_ERR(ENOMEM);
	}
	}

	switch (update.type) {
	case DRM_DRAWABLE_CLIPRECTS:
	if (update.num != info->num_rects) {
	rects = drm_alloc(update.num * sizeof(struct drm_clip_rect),
	DRM_MEM_BUFS);
	} else
	rects = info->rects;

	if (update.num && !rects) {
	DRM_ERROR("Failed to allocate cliprect memory\n");
	err = DRM_ERR(ENOMEM);
	goto error;
	}

	if (update.num && DRM_COPY_FROM_USER(rects,
	(struct drm_clip_rect __user *)
	(unsigned long)update.data,
	update.num *
	sizeof(*rects))) {
	DRM_ERROR("Failed to copy cliprects from userspace\n");
	err = DRM_ERR(EFAULT);
	goto error;
	}

	spin_lock_irqsave(&dev->drw_lock, irqflags);

	if (rects != info->rects) {
	drm_free(info->rects, info->num_rects *
	sizeof(struct drm_clip_rect), DRM_MEM_BUFS);
	}

	info->rects = rects;
	info->num_rects = update.num;
	dev->drw_info[id] = info;

	spin_unlock_irqrestore(&dev->drw_lock, irqflags);

	DRM_DEBUG("Updated %d cliprects for drawable %d\n",
	info->num_rects, id);
	break;
	default:
	DRM_ERROR("Invalid update type %d\n", update.type);
	return DRM_ERR(EINVAL);
	}

	return 0;

	error:
	if (!dev->drw_info[id])
	drm_free(info, sizeof(*info), DRM_MEM_BUFS);
	else if (rects != dev->drw_info[id]->rects)
	drm_free(rects, update.num *
	sizeof(struct drm_clip_rect), DRM_MEM_BUFS);

	return err;
	}

	/**
	* Caller must hold the drawable spinlock!
	*/
	struct drm_drawable_info drm_get_drawable_info(drm_device_t dev, drm_drawable_t id) {
	u32 *bitfield = dev->drw_bitfield;
	unsigned int idx, shift;

	id--;
	idx = id / (8 * sizeof(*bitfield));
	shift = id % (8 * sizeof(*bitfield));

	if (idx < 0 \|\| idx >= dev->drw_bitfield_length \|\|
	!(bitfield[idx] & (1 << shift))) {
	DRM_DEBUG("No such drawable %d\n", id);
	return NULL;
	}

	return dev->drw_info[id];
	}
	EXPORT_SYMBOL(drm_get_drawable_info);