linux/drivers/char/drm/drm_drawable.c
=?utf-8?q?Felix_K=C3=BChling?= 507c0185a7 drm: drm_rmdraw: Declare id and idx as signed so testing for < 0 works as intended.
Signed-off-by: Dave Airlie <airlied@linux.ie>
2006-12-07 15:53:29 +11:00

330 lines
8.6 KiB
C

/**
* \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;
drm_drawable_info_t **info = dev->drw_info;
unsigned int info_length = dev->drw_info_length;
drm_draw_t 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((drm_draw_t __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;
drm_draw_t draw;
int id, idx;
unsigned int shift;
unsigned long irqflags;
u32 *bitfield = dev->drw_bitfield;
unsigned int bitfield_length = dev->drw_bitfield_length;
drm_drawable_info_t **info = dev->drw_info;
unsigned int info_length = dev->drw_info_length;
DRM_COPY_FROM_USER_IOCTL(draw, (drm_draw_t __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(drm_clip_rect_t), 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;
if (idx != id / (8 * sizeof(*bitfield)))
bitfield = drm_alloc(bitfield_length *
sizeof(*bitfield), DRM_MEM_BUFS);
if (!bitfield && bitfield_length) {
bitfield = dev->drw_bitfield;
bitfield_length = dev->drw_bitfield_length;
}
}
if (bitfield != dev->drw_bitfield) {
info_length = 8 * sizeof(*bitfield) * bitfield_length;
info = drm_alloc(info_length * sizeof(*info), DRM_MEM_BUFS);
if (!info && info_length) {
info = dev->drw_info;
info_length = dev->drw_info_length;
}
spin_lock_irqsave(&dev->drw_lock, irqflags);
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) {
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;
drm_update_draw_t update;
unsigned int id, idx, shift;
u32 *bitfield = dev->drw_bitfield;
unsigned long irqflags, bitfield_length = dev->drw_bitfield_length;
drm_drawable_info_t *info;
drm_clip_rect_t *rects;
int err;
DRM_COPY_FROM_USER_IOCTL(update, (drm_update_draw_t __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(drm_drawable_info_t), 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(drm_clip_rect_t),
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,
(drm_clip_rect_t __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(drm_clip_rect_t), 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(drm_clip_rect_t), DRM_MEM_BUFS);
return err;
}
/**
* Caller must hold the drawable spinlock!
*/
drm_drawable_info_t *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);