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drm/linux/bufs.c

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/* bufs.c -- IOCTLs to manage buffers -*- linux-c -*-
* Created: Tue Feb 2 08:37:54 1999 by faith@precisioninsight.com
*
* Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
* 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
* PRECISION INSIGHT 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.
*
* Authors:
* Rickard E. (Rik) Faith <faith@valinux.com>
*
*/
#define __NO_VERSION__
#include <linux/config.h>
#include "drmP.h"
#include "linux/un.h"
/* Compute order. Can be made faster. */
int drm_order(unsigned long size)
{
int order;
unsigned long tmp;
for (order = 0, tmp = size; tmp >>= 1; ++order);
if (size & ~(1 << order)) ++order;
return order;
}
int drm_addmap(struct inode *inode, struct file *filp, unsigned int cmd,
unsigned long arg)
{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->dev;
drm_map_t *map;
if (!(filp->f_mode & 3)) return -EACCES; /* Require read/write */
map = drm_alloc(sizeof(*map), DRM_MEM_MAPS);
if (!map) return -ENOMEM;
if (copy_from_user(map, (drm_map_t *)arg, sizeof(*map))) {
drm_free(map, sizeof(*map), DRM_MEM_MAPS);
return -EFAULT;
}
DRM_DEBUG("offset = 0x%08lx, size = 0x%08lx, type = %d\n",
map->offset, map->size, map->type);
if ((map->offset & (~PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
drm_free(map, sizeof(*map), DRM_MEM_MAPS);
return -EINVAL;
}
map->mtrr = -1;
map->handle = 0;
switch (map->type) {
case _DRM_REGISTERS:
case _DRM_FRAME_BUFFER:
#ifndef __sparc__
if (map->offset + map->size < map->offset
|| map->offset < virt_to_phys(high_memory)) {
drm_free(map, sizeof(*map), DRM_MEM_MAPS);
return -EINVAL;
}
#endif
#ifdef CONFIG_MTRR
if (map->type == _DRM_FRAME_BUFFER
|| (map->flags & _DRM_WRITE_COMBINING)) {
map->mtrr = mtrr_add(map->offset, map->size,
MTRR_TYPE_WRCOMB, 1);
}
#endif
map->handle = drm_ioremap(map->offset, map->size);
break;
case _DRM_SHM:
map->handle = (void *)drm_alloc_pages(drm_order(map->size)
- PAGE_SHIFT,
DRM_MEM_SAREA);
DRM_DEBUG("%ld %d %p\n", map->size, drm_order(map->size),
map->handle);
if (!map->handle) {
drm_free(map, sizeof(*map), DRM_MEM_MAPS);
return -ENOMEM;
}
map->offset = (unsigned long)map->handle;
if (map->flags & _DRM_CONTAINS_LOCK) {
dev->lock.hw_lock = map->handle; /* Pointer to lock */
}
break;
#if defined(CONFIG_AGP) || defined(CONFIG_AGP_MODULE)
case _DRM_AGP:
map->offset = map->offset + dev->agp->base;
break;
#endif
default:
drm_free(map, sizeof(*map), DRM_MEM_MAPS);
return -EINVAL;
}
down(&dev->struct_sem);
if (dev->maplist) {
++dev->map_count;
dev->maplist = drm_realloc(dev->maplist,
(dev->map_count-1)
* sizeof(*dev->maplist),
dev->map_count
* sizeof(*dev->maplist),
DRM_MEM_MAPS);
} else {
dev->map_count = 1;
dev->maplist = drm_alloc(dev->map_count*sizeof(*dev->maplist),
DRM_MEM_MAPS);
}
dev->maplist[dev->map_count-1] = map;
up(&dev->struct_sem);
if (copy_to_user((drm_map_t *)arg, map, sizeof(*map)))
return -EFAULT;
if (map->type != _DRM_SHM) {
if (copy_to_user(&((drm_map_t *)arg)->handle,
&map->offset,
sizeof(map->offset)))
return -EFAULT;
}
return 0;
}
int drm_addbufs(struct inode *inode, struct file *filp, unsigned int cmd,
unsigned long arg)
{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->dev;
drm_device_dma_t *dma = dev->dma;
drm_buf_desc_t request;
int count;
int order;
int size;
int total;
int page_order;
drm_buf_entry_t *entry;
unsigned long page;
drm_buf_t *buf;
int alignment;
unsigned long offset;
int i;
int byte_count;
int page_count;
if (!dma) return -EINVAL;
if (copy_from_user(&request,
(drm_buf_desc_t *)arg,
sizeof(request)))
return -EFAULT;
count = request.count;
order = drm_order(request.size);
size = 1 << order;
DRM_DEBUG("count = %d, size = %d (%d), order = %d, queue_count = %d\n",
request.count, request.size, size, order, dev->queue_count);
if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) return -EINVAL;
if (dev->queue_count) return -EBUSY; /* Not while in use */
alignment = (request.flags & _DRM_PAGE_ALIGN) ? PAGE_ALIGN(size):size;
page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
total = PAGE_SIZE << page_order;
spin_lock(&dev->count_lock);
if (dev->buf_use) {
spin_unlock(&dev->count_lock);
return -EBUSY;
}
atomic_inc(&dev->buf_alloc);
spin_unlock(&dev->count_lock);
down(&dev->struct_sem);
entry = &dma->bufs[order];
if (entry->buf_count) {
up(&dev->struct_sem);
atomic_dec(&dev->buf_alloc);
return -ENOMEM; /* May only call once for each order */
}
entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
DRM_MEM_BUFS);
if (!entry->buflist) {
up(&dev->struct_sem);
atomic_dec(&dev->buf_alloc);
return -ENOMEM;
}
memset(entry->buflist, 0, count * sizeof(*entry->buflist));
entry->seglist = drm_alloc(count * sizeof(*entry->seglist),
DRM_MEM_SEGS);
if (!entry->seglist) {
drm_free(entry->buflist,
count * sizeof(*entry->buflist),
DRM_MEM_BUFS);
up(&dev->struct_sem);
atomic_dec(&dev->buf_alloc);
return -ENOMEM;
}
memset(entry->seglist, 0, count * sizeof(*entry->seglist));
dma->pagelist = drm_realloc(dma->pagelist,
dma->page_count * sizeof(*dma->pagelist),
(dma->page_count + (count << page_order))
* sizeof(*dma->pagelist),
DRM_MEM_PAGES);
DRM_DEBUG("pagelist: %d entries\n",
dma->page_count + (count << page_order));
entry->buf_size = size;
entry->page_order = page_order;
byte_count = 0;
page_count = 0;
while (entry->buf_count < count) {
if (!(page = drm_alloc_pages(page_order, DRM_MEM_DMA))) break;
entry->seglist[entry->seg_count++] = page;
for (i = 0; i < (1 << page_order); i++) {
DRM_DEBUG("page %d @ 0x%08lx\n",
dma->page_count + page_count,
page + PAGE_SIZE * i);
dma->pagelist[dma->page_count + page_count++]
= page + PAGE_SIZE * i;
}
for (offset = 0;
offset + size <= total && entry->buf_count < count;
offset += alignment, ++entry->buf_count) {
buf = &entry->buflist[entry->buf_count];
buf->idx = dma->buf_count + entry->buf_count;
buf->total = alignment;
buf->order = order;
buf->used = 0;
buf->offset = (dma->byte_count + byte_count + offset);
buf->address = (void *)(page + offset);
buf->next = NULL;
buf->waiting = 0;
buf->pending = 0;
init_waitqueue_head(&buf->dma_wait);
buf->pid = 0;
#if DRM_DMA_HISTOGRAM
buf->time_queued = 0;
buf->time_dispatched = 0;
buf->time_completed = 0;
buf->time_freed = 0;
#endif
DRM_DEBUG("buffer %d @ %p\n",
entry->buf_count, buf->address);
}
byte_count += PAGE_SIZE << page_order;
}
dma->buflist = drm_realloc(dma->buflist,
dma->buf_count * sizeof(*dma->buflist),
(dma->buf_count + entry->buf_count)
* sizeof(*dma->buflist),
DRM_MEM_BUFS);
for (i = dma->buf_count; i < dma->buf_count + entry->buf_count; i++)
dma->buflist[i] = &entry->buflist[i - dma->buf_count];
dma->buf_count += entry->buf_count;
dma->seg_count += entry->seg_count;
dma->page_count += entry->seg_count << page_order;
dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
drm_freelist_create(&entry->freelist, entry->buf_count);
for (i = 0; i < entry->buf_count; i++) {
drm_freelist_put(dev, &entry->freelist, &entry->buflist[i]);
}
up(&dev->struct_sem);
request.count = entry->buf_count;
request.size = size;
if (copy_to_user((drm_buf_desc_t *)arg,
&request,
sizeof(request)))
return -EFAULT;
atomic_dec(&dev->buf_alloc);
return 0;
}
int drm_infobufs(struct inode *inode, struct file *filp, unsigned int cmd,
unsigned long arg)
{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->dev;
drm_device_dma_t *dma = dev->dma;
drm_buf_info_t request;
int i;
int count;
if (!dma) return -EINVAL;
spin_lock(&dev->count_lock);
if (atomic_read(&dev->buf_alloc)) {
spin_unlock(&dev->count_lock);
return -EBUSY;
}
++dev->buf_use; /* Can't allocate more after this call */
spin_unlock(&dev->count_lock);
if (copy_from_user(&request,
(drm_buf_info_t *)arg,
sizeof(request)))
return -EFAULT;
for (i = 0, count = 0; i < DRM_MAX_ORDER+1; i++) {
if (dma->bufs[i].buf_count) ++count;
}
DRM_DEBUG("count = %d\n", count);
if (request.count >= count) {
for (i = 0, count = 0; i < DRM_MAX_ORDER+1; i++) {
if (dma->bufs[i].buf_count) {
if (copy_to_user(&request.list[count].count,
&dma->bufs[i].buf_count,
sizeof(dma->bufs[0]
.buf_count)) ||
copy_to_user(&request.list[count].size,
&dma->bufs[i].buf_size,
sizeof(dma->bufs[0].buf_size)) ||
copy_to_user(&request.list[count].low_mark,
&dma->bufs[i]
.freelist.low_mark,
sizeof(dma->bufs[0]
.freelist.low_mark)) ||
copy_to_user(&request.list[count]
.high_mark,
&dma->bufs[i]
.freelist.high_mark,
sizeof(dma->bufs[0]
.freelist.high_mark)))
return -EFAULT;
DRM_DEBUG("%d %d %d %d %d\n",
i,
dma->bufs[i].buf_count,
dma->bufs[i].buf_size,
dma->bufs[i].freelist.low_mark,
dma->bufs[i].freelist.high_mark);
++count;
}
}
}
request.count = count;
if (copy_to_user((drm_buf_info_t *)arg,
&request,
sizeof(request)))
return -EFAULT;
return 0;
}
int drm_markbufs(struct inode *inode, struct file *filp, unsigned int cmd,
unsigned long arg)
{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->dev;
drm_device_dma_t *dma = dev->dma;
drm_buf_desc_t request;
int order;
drm_buf_entry_t *entry;
if (!dma) return -EINVAL;
if (copy_from_user(&request,
(drm_buf_desc_t *)arg,
sizeof(request)))
return -EFAULT;
DRM_DEBUG("%d, %d, %d\n",
request.size, request.low_mark, request.high_mark);
order = drm_order(request.size);
if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) return -EINVAL;
entry = &dma->bufs[order];
if (request.low_mark < 0 || request.low_mark > entry->buf_count)
return -EINVAL;
if (request.high_mark < 0 || request.high_mark > entry->buf_count)
return -EINVAL;
entry->freelist.low_mark = request.low_mark;
entry->freelist.high_mark = request.high_mark;
return 0;
}
int drm_freebufs(struct inode *inode, struct file *filp, unsigned int cmd,
unsigned long arg)
{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->dev;
drm_device_dma_t *dma = dev->dma;
drm_buf_free_t request;
int i;
int idx;
drm_buf_t *buf;
if (!dma) return -EINVAL;
if (copy_from_user(&request,
(drm_buf_free_t *)arg,
sizeof(request)))
return -EFAULT;
DRM_DEBUG("%d\n", request.count);
for (i = 0; i < request.count; i++) {
if (copy_from_user(&idx,
&request.list[i],
sizeof(idx)))
return -EFAULT;
if (idx < 0 || idx >= dma->buf_count) {
DRM_ERROR("Index %d (of %d max)\n",
idx, dma->buf_count - 1);
return -EINVAL;
}
buf = dma->buflist[idx];
if (buf->pid != current->pid) {
DRM_ERROR("Process %d freeing buffer owned by %d\n",
current->pid, buf->pid);
return -EINVAL;
}
drm_free_buffer(dev, buf);
}
return 0;
}
int drm_mapbufs(struct inode *inode, struct file *filp, unsigned int cmd,
unsigned long arg)
{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->dev;
drm_device_dma_t *dma = dev->dma;
int retcode = 0;
const int zero = 0;
unsigned long virtual;
unsigned long address;
drm_buf_map_t request;
int i;
if (!dma) return -EINVAL;
DRM_DEBUG("\n");
spin_lock(&dev->count_lock);
if (atomic_read(&dev->buf_alloc)) {
spin_unlock(&dev->count_lock);
return -EBUSY;
}
++dev->buf_use; /* Can't allocate more after this call */
spin_unlock(&dev->count_lock);
if (copy_from_user(&request,
(drm_buf_map_t *)arg,
sizeof(request)))
return -EFAULT;
if (request.count >= dma->buf_count) {
down(&current->mm->mmap_sem);
virtual = do_mmap(filp, 0, dma->byte_count,
PROT_READ|PROT_WRITE, MAP_SHARED, 0);
up(&current->mm->mmap_sem);
if (virtual > -1024UL) {
/* Real error */
retcode = (signed long)virtual;
goto done;
}
request.virtual = (void *)virtual;
for (i = 0; i < dma->buf_count; i++) {
if (copy_to_user(&request.list[i].idx,
&dma->buflist[i]->idx,
sizeof(request.list[0].idx))) {
retcode = -EFAULT;
goto done;
}
if (copy_to_user(&request.list[i].total,
&dma->buflist[i]->total,
sizeof(request.list[0].total))) {
retcode = -EFAULT;
goto done;
}
if (copy_to_user(&request.list[i].used,
&zero,
sizeof(zero))) {
retcode = -EFAULT;
goto done;
}
address = virtual + dma->buflist[i]->offset;
if (copy_to_user(&request.list[i].address,
&address,
sizeof(address))) {
retcode = -EFAULT;
goto done;
}
}
}
done:
request.count = dma->buf_count;
DRM_DEBUG("%d buffers, retcode = %d\n", request.count, retcode);
if (copy_to_user((drm_buf_map_t *)arg,
&request,
sizeof(request)))
return -EFAULT;
return retcode;
}
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