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linux/drivers/char/drm/drm_bufs.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

1270 lines
34 KiB
C
Raw Blame History

/**
* \file drm_bufs.h
* Generic buffer template
*
* \author Rickard E. (Rik) Faith <faith@valinux.com>
* \author Gareth Hughes <gareth@valinux.com>
*/
/*
* Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.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
* 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 <linux/vmalloc.h>
#include "drmP.h"
/**
* Compute size order. Returns the exponent of the smaller power of two which
* is greater or equal to given number.
*
* \param size size.
* \return order.
*
* \todo Can be made faster.
*/
int drm_order( unsigned long size )
{
int order;
unsigned long tmp;
for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++)
;
if (size & (size - 1))
++order;
return order;
}
EXPORT_SYMBOL(drm_order);
/**
* Ioctl to specify a range of memory that is available for mapping by a non-root process.
*
* \param inode device inode.
* \param filp file pointer.
* \param cmd command.
* \param arg pointer to a drm_map structure.
* \return zero on success or a negative value on error.
*
* Adjusts the memory offset to its absolute value according to the mapping
* type. Adds the map to the map list drm_device::maplist. Adds MTRR's where
* applicable and if supported by the kernel.
*/
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->head->dev;
drm_map_t *map;
drm_map_t __user *argp = (void __user *)arg;
drm_map_list_t *list;
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, argp, sizeof(*map) ) ) {
drm_free( map, sizeof(*map), DRM_MEM_MAPS );
return -EFAULT;
}
/* Only allow shared memory to be removable since we only keep enough
* book keeping information about shared memory to allow for removal
* when processes fork.
*/
if ( (map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM ) {
drm_free( map, sizeof(*map), DRM_MEM_MAPS );
return -EINVAL;
}
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 = NULL;
switch ( map->type ) {
case _DRM_REGISTERS:
case _DRM_FRAME_BUFFER:
#if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__)
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 __alpha__
map->offset += dev->hose->mem_space->start;
#endif
if (drm_core_has_MTRR(dev)) {
if ( map->type == _DRM_FRAME_BUFFER ||
(map->flags & _DRM_WRITE_COMBINING) ) {
map->mtrr = mtrr_add( map->offset, map->size,
MTRR_TYPE_WRCOMB, 1 );
}
}
if (map->type == _DRM_REGISTERS)
map->handle = drm_ioremap( map->offset, map->size,
dev );
break;
case _DRM_SHM:
map->handle = vmalloc_32(map->size);
DRM_DEBUG( "%lu %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 ) {
/* Prevent a 2nd X Server from creating a 2nd lock */
if (dev->lock.hw_lock != NULL) {
vfree( map->handle );
drm_free( map, sizeof(*map), DRM_MEM_MAPS );
return -EBUSY;
}
dev->sigdata.lock =
dev->lock.hw_lock = map->handle; /* Pointer to lock */
}
break;
case _DRM_AGP:
if (drm_core_has_AGP(dev)) {
#ifdef __alpha__
map->offset += dev->hose->mem_space->start;
#endif
map->offset += dev->agp->base;
map->mtrr = dev->agp->agp_mtrr; /* for getmap */
}
break;
case _DRM_SCATTER_GATHER:
if (!dev->sg) {
drm_free(map, sizeof(*map), DRM_MEM_MAPS);
return -EINVAL;
}
map->offset += dev->sg->handle;
break;
default:
drm_free( map, sizeof(*map), DRM_MEM_MAPS );
return -EINVAL;
}
list = drm_alloc(sizeof(*list), DRM_MEM_MAPS);
if(!list) {
drm_free(map, sizeof(*map), DRM_MEM_MAPS);
return -EINVAL;
}
memset(list, 0, sizeof(*list));
list->map = map;
down(&dev->struct_sem);
list_add(&list->head, &dev->maplist->head);
up(&dev->struct_sem);
if ( copy_to_user( argp, map, sizeof(*map) ) )
return -EFAULT;
if ( map->type != _DRM_SHM ) {
if ( copy_to_user( &argp->handle,
&map->offset,
sizeof(map->offset) ) )
return -EFAULT;
}
return 0;
}
/**
* Remove a map private from list and deallocate resources if the mapping
* isn't in use.
*
* \param inode device inode.
* \param filp file pointer.
* \param cmd command.
* \param arg pointer to a drm_map_t structure.
* \return zero on success or a negative value on error.
*
* Searches the map on drm_device::maplist, removes it from the list, see if
* its being used, and free any associate resource (such as MTRR's) if it's not
* being on use.
*
* \sa addmap().
*/
int drm_rmmap(struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg)
{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->head->dev;
struct list_head *list;
drm_map_list_t *r_list = NULL;
drm_vma_entry_t *pt, *prev;
drm_map_t *map;
drm_map_t request;
int found_maps = 0;
if (copy_from_user(&request, (drm_map_t __user *)arg,
sizeof(request))) {
return -EFAULT;
}
down(&dev->struct_sem);
list = &dev->maplist->head;
list_for_each(list, &dev->maplist->head) {
r_list = list_entry(list, drm_map_list_t, head);
if(r_list->map &&
r_list->map->handle == request.handle &&
r_list->map->flags & _DRM_REMOVABLE) break;
}
/* List has wrapped around to the head pointer, or its empty we didn't
* find anything.
*/
if(list == (&dev->maplist->head)) {
up(&dev->struct_sem);
return -EINVAL;
}
map = r_list->map;
list_del(list);
drm_free(list, sizeof(*list), DRM_MEM_MAPS);
for (pt = dev->vmalist, prev = NULL; pt; prev = pt, pt = pt->next) {
if (pt->vma->vm_private_data == map) found_maps++;
}
if(!found_maps) {
switch (map->type) {
case _DRM_REGISTERS:
case _DRM_FRAME_BUFFER:
if (drm_core_has_MTRR(dev)) {
if (map->mtrr >= 0) {
int retcode;
retcode = mtrr_del(map->mtrr,
map->offset,
map->size);
DRM_DEBUG("mtrr_del = %d\n", retcode);
}
}
drm_ioremapfree(map->handle, map->size, dev);
break;
case _DRM_SHM:
vfree(map->handle);
break;
case _DRM_AGP:
case _DRM_SCATTER_GATHER:
break;
}
drm_free(map, sizeof(*map), DRM_MEM_MAPS);
}
up(&dev->struct_sem);
return 0;
}
/**
* Cleanup after an error on one of the addbufs() functions.
*
* \param entry buffer entry where the error occurred.
*
* Frees any pages and buffers associated with the given entry.
*/
static void drm_cleanup_buf_error(drm_device_t *dev, drm_buf_entry_t *entry)
{
int i;
if (entry->seg_count) {
for (i = 0; i < entry->seg_count; i++) {
if (entry->seglist[i]) {
drm_free_pages(entry->seglist[i],
entry->page_order,
DRM_MEM_DMA);
}
}
drm_free(entry->seglist,
entry->seg_count *
sizeof(*entry->seglist),
DRM_MEM_SEGS);
entry->seg_count = 0;
}
if (entry->buf_count) {
for (i = 0; i < entry->buf_count; i++) {
if (entry->buflist[i].dev_private) {
drm_free(entry->buflist[i].dev_private,
entry->buflist[i].dev_priv_size,
DRM_MEM_BUFS);
}
}
drm_free(entry->buflist,
entry->buf_count *
sizeof(*entry->buflist),
DRM_MEM_BUFS);
entry->buf_count = 0;
}
}
#if __OS_HAS_AGP
/**
* Add AGP buffers for DMA transfers (ioctl).
*
* \param inode device inode.
* \param filp file pointer.
* \param cmd command.
* \param arg pointer to a drm_buf_desc_t request.
* \return zero on success or a negative number on failure.
*
* After some sanity checks creates a drm_buf structure for each buffer and
* reallocates the buffer list of the same size order to accommodate the new
* buffers.
*/
int drm_addbufs_agp( struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg )
{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->head->dev;
drm_device_dma_t *dma = dev->dma;
drm_buf_desc_t request;
drm_buf_entry_t *entry;
drm_buf_t *buf;
unsigned long offset;
unsigned long agp_offset;
int count;
int order;
int size;
int alignment;
int page_order;
int total;
int byte_count;
int i;
drm_buf_t **temp_buflist;
drm_buf_desc_t __user *argp = (void __user *)arg;
if ( !dma ) return -EINVAL;
if ( copy_from_user( &request, argp,
sizeof(request) ) )
return -EFAULT;
count = request.count;
order = drm_order( request.size );
size = 1 << order;
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;
byte_count = 0;
agp_offset = dev->agp->base + request.agp_start;
DRM_DEBUG( "count: %d\n", count );
DRM_DEBUG( "order: %d\n", order );
DRM_DEBUG( "size: %d\n", size );
DRM_DEBUG( "agp_offset: %lu\n", agp_offset );
DRM_DEBUG( "alignment: %d\n", alignment );
DRM_DEBUG( "page_order: %d\n", page_order );
DRM_DEBUG( "total: %d\n", total );
if ( order < DRM_MIN_ORDER || order > DRM_MAX_ORDER ) return -EINVAL;
if ( dev->queue_count ) return -EBUSY; /* Not while in use */
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 */
}
if (count < 0 || count > 4096) {
up( &dev->struct_sem );
atomic_dec( &dev->buf_alloc );
return -EINVAL;
}
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->buf_size = size;
entry->page_order = page_order;
offset = 0;
while ( entry->buf_count < 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 + offset);
buf->bus_address = agp_offset + offset;
buf->address = (void *)(agp_offset + offset);
buf->next = NULL;
buf->waiting = 0;
buf->pending = 0;
init_waitqueue_head( &buf->dma_wait );
buf->filp = NULL;
buf->dev_priv_size = dev->driver->dev_priv_size;
buf->dev_private = drm_alloc( buf->dev_priv_size,
DRM_MEM_BUFS );
if(!buf->dev_private) {
/* Set count correctly so we free the proper amount. */
entry->buf_count = count;
drm_cleanup_buf_error(dev,entry);
up( &dev->struct_sem );
atomic_dec( &dev->buf_alloc );
return -ENOMEM;
}
memset( buf->dev_private, 0, buf->dev_priv_size );
DRM_DEBUG( "buffer %d @ %p\n",
entry->buf_count, buf->address );
offset += alignment;
entry->buf_count++;
byte_count += PAGE_SIZE << page_order;
}
DRM_DEBUG( "byte_count: %d\n", byte_count );
temp_buflist = drm_realloc( dma->buflist,
dma->buf_count * sizeof(*dma->buflist),
(dma->buf_count + entry->buf_count)
* sizeof(*dma->buflist),
DRM_MEM_BUFS );
if(!temp_buflist) {
/* Free the entry because it isn't valid */
drm_cleanup_buf_error(dev,entry);
up( &dev->struct_sem );
atomic_dec( &dev->buf_alloc );
return -ENOMEM;
}
dma->buflist = temp_buflist;
for ( i = 0 ; i < entry->buf_count ; i++ ) {
dma->buflist[i + dma->buf_count] = &entry->buflist[i];
}
dma->buf_count += entry->buf_count;
dma->byte_count += byte_count;
DRM_DEBUG( "dma->buf_count : %d\n", dma->buf_count );
DRM_DEBUG( "entry->buf_count : %d\n", entry->buf_count );
up( &dev->struct_sem );
request.count = entry->buf_count;
request.size = size;
if ( copy_to_user( argp, &request, sizeof(request) ) )
return -EFAULT;
dma->flags = _DRM_DMA_USE_AGP;
atomic_dec( &dev->buf_alloc );
return 0;
}
#endif /* __OS_HAS_AGP */
int drm_addbufs_pci( struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg )
{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->head->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;
unsigned long *temp_pagelist;
drm_buf_t **temp_buflist;
drm_buf_desc_t __user *argp = (void __user *)arg;
if (!drm_core_check_feature(dev, DRIVER_PCI_DMA)) return -EINVAL;
if ( !dma ) return -EINVAL;
if ( copy_from_user( &request, argp, 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 */
}
if (count < 0 || count > 4096) {
up( &dev->struct_sem );
atomic_dec( &dev->buf_alloc );
return -EINVAL;
}
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) );
/* Keep the original pagelist until we know all the allocations
* have succeeded
*/
temp_pagelist = drm_alloc( (dma->page_count + (count << page_order))
* sizeof(*dma->pagelist),
DRM_MEM_PAGES );
if (!temp_pagelist) {
drm_free( entry->buflist,
count * sizeof(*entry->buflist),
DRM_MEM_BUFS );
drm_free( entry->seglist,
count * sizeof(*entry->seglist),
DRM_MEM_SEGS );
up( &dev->struct_sem );
atomic_dec( &dev->buf_alloc );
return -ENOMEM;
}
memcpy(temp_pagelist,
dma->pagelist,
dma->page_count * sizeof(*dma->pagelist));
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 ) {
page = drm_alloc_pages( page_order, DRM_MEM_DMA );
if ( !page ) {
/* Set count correctly so we free the proper amount. */
entry->buf_count = count;
entry->seg_count = count;
drm_cleanup_buf_error(dev, entry);
drm_free( temp_pagelist,
(dma->page_count + (count << page_order))
* sizeof(*dma->pagelist),
DRM_MEM_PAGES );
up( &dev->struct_sem );
atomic_dec( &dev->buf_alloc );
return -ENOMEM;
}
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 );
temp_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->filp = NULL;
buf->dev_priv_size = dev->driver->dev_priv_size;
buf->dev_private = drm_alloc( buf->dev_priv_size,
DRM_MEM_BUFS );
if(!buf->dev_private) {
/* Set count correctly so we free the proper amount. */
entry->buf_count = count;
entry->seg_count = count;
drm_cleanup_buf_error(dev,entry);
drm_free( temp_pagelist,
(dma->page_count + (count << page_order))
* sizeof(*dma->pagelist),
DRM_MEM_PAGES );
up( &dev->struct_sem );
atomic_dec( &dev->buf_alloc );
return -ENOMEM;
}
memset( buf->dev_private, 0, buf->dev_priv_size );
DRM_DEBUG( "buffer %d @ %p\n",
entry->buf_count, buf->address );
}
byte_count += PAGE_SIZE << page_order;
}
temp_buflist = drm_realloc( dma->buflist,
dma->buf_count * sizeof(*dma->buflist),
(dma->buf_count + entry->buf_count)
* sizeof(*dma->buflist),
DRM_MEM_BUFS );
if (!temp_buflist) {
/* Free the entry because it isn't valid */
drm_cleanup_buf_error(dev,entry);
drm_free( temp_pagelist,
(dma->page_count + (count << page_order))
* sizeof(*dma->pagelist),
DRM_MEM_PAGES );
up( &dev->struct_sem );
atomic_dec( &dev->buf_alloc );
return -ENOMEM;
}
dma->buflist = temp_buflist;
for ( i = 0 ; i < entry->buf_count ; i++ ) {
dma->buflist[i + dma->buf_count] = &entry->buflist[i];
}
/* No allocations failed, so now we can replace the orginal pagelist
* with the new one.
*/
if (dma->page_count) {
drm_free(dma->pagelist,
dma->page_count * sizeof(*dma->pagelist),
DRM_MEM_PAGES);
}
dma->pagelist = temp_pagelist;
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);
up( &dev->struct_sem );
request.count = entry->buf_count;
request.size = size;
if ( copy_to_user( argp, &request, sizeof(request) ) )
return -EFAULT;
atomic_dec( &dev->buf_alloc );
return 0;
}
int drm_addbufs_sg( struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg )
{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->head->dev;
drm_device_dma_t *dma = dev->dma;
drm_buf_desc_t __user *argp = (void __user *)arg;
drm_buf_desc_t request;
drm_buf_entry_t *entry;
drm_buf_t *buf;
unsigned long offset;
unsigned long agp_offset;
int count;
int order;
int size;
int alignment;
int page_order;
int total;
int byte_count;
int i;
drm_buf_t **temp_buflist;
if (!drm_core_check_feature(dev, DRIVER_SG)) return -EINVAL;
if ( !dma ) return -EINVAL;
if ( copy_from_user( &request, argp, sizeof(request) ) )
return -EFAULT;
count = request.count;
order = drm_order( request.size );
size = 1 << order;
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;
byte_count = 0;
agp_offset = request.agp_start;
DRM_DEBUG( "count: %d\n", count );
DRM_DEBUG( "order: %d\n", order );
DRM_DEBUG( "size: %d\n", size );
DRM_DEBUG( "agp_offset: %lu\n", agp_offset );
DRM_DEBUG( "alignment: %d\n", alignment );
DRM_DEBUG( "page_order: %d\n", page_order );
DRM_DEBUG( "total: %d\n", total );
if ( order < DRM_MIN_ORDER || order > DRM_MAX_ORDER ) return -EINVAL;
if ( dev->queue_count ) return -EBUSY; /* Not while in use */
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 */
}
if (count < 0 || count > 4096) {
up( &dev->struct_sem );
atomic_dec( &dev->buf_alloc );
return -EINVAL;
}
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->buf_size = size;
entry->page_order = page_order;
offset = 0;
while ( entry->buf_count < 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 + offset);
buf->bus_address = agp_offset + offset;
buf->address = (void *)(agp_offset + offset + dev->sg->handle);
buf->next = NULL;
buf->waiting = 0;
buf->pending = 0;
init_waitqueue_head( &buf->dma_wait );
buf->filp = NULL;
buf->dev_priv_size = dev->driver->dev_priv_size;
buf->dev_private = drm_alloc( buf->dev_priv_size,
DRM_MEM_BUFS );
if(!buf->dev_private) {
/* Set count correctly so we free the proper amount. */
entry->buf_count = count;
drm_cleanup_buf_error(dev,entry);
up( &dev->struct_sem );
atomic_dec( &dev->buf_alloc );
return -ENOMEM;
}
memset( buf->dev_private, 0, buf->dev_priv_size );
DRM_DEBUG( "buffer %d @ %p\n",
entry->buf_count, buf->address );
offset += alignment;
entry->buf_count++;
byte_count += PAGE_SIZE << page_order;
}
DRM_DEBUG( "byte_count: %d\n", byte_count );
temp_buflist = drm_realloc( dma->buflist,
dma->buf_count * sizeof(*dma->buflist),
(dma->buf_count + entry->buf_count)
* sizeof(*dma->buflist),
DRM_MEM_BUFS );
if(!temp_buflist) {
/* Free the entry because it isn't valid */
drm_cleanup_buf_error(dev,entry);
up( &dev->struct_sem );
atomic_dec( &dev->buf_alloc );
return -ENOMEM;
}
dma->buflist = temp_buflist;
for ( i = 0 ; i < entry->buf_count ; i++ ) {
dma->buflist[i + dma->buf_count] = &entry->buflist[i];
}
dma->buf_count += entry->buf_count;
dma->byte_count += byte_count;
DRM_DEBUG( "dma->buf_count : %d\n", dma->buf_count );
DRM_DEBUG( "entry->buf_count : %d\n", entry->buf_count );
up( &dev->struct_sem );
request.count = entry->buf_count;
request.size = size;
if ( copy_to_user( argp, &request, sizeof(request) ) )
return -EFAULT;
dma->flags = _DRM_DMA_USE_SG;
atomic_dec( &dev->buf_alloc );
return 0;
}
/**
* Add buffers for DMA transfers (ioctl).
*
* \param inode device inode.
* \param filp file pointer.
* \param cmd command.
* \param arg pointer to a drm_buf_desc_t request.
* \return zero on success or a negative number on failure.
*
* According with the memory type specified in drm_buf_desc::flags and the
* build options, it dispatches the call either to addbufs_agp(),
* addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
* PCI memory respectively.
*/
int drm_addbufs( struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg )
{
drm_buf_desc_t request;
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->head->dev;
if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
return -EINVAL;
if ( copy_from_user( &request, (drm_buf_desc_t __user *)arg,
sizeof(request) ) )
return -EFAULT;
#if __OS_HAS_AGP
if ( request.flags & _DRM_AGP_BUFFER )
return drm_addbufs_agp( inode, filp, cmd, arg );
else
#endif
if ( request.flags & _DRM_SG_BUFFER )
return drm_addbufs_sg( inode, filp, cmd, arg );
else
return drm_addbufs_pci( inode, filp, cmd, arg );
}
/**
* Get information about the buffer mappings.
*
* This was originally mean for debugging purposes, or by a sophisticated
* client library to determine how best to use the available buffers (e.g.,
* large buffers can be used for image transfer).
*
* \param inode device inode.
* \param filp file pointer.
* \param cmd command.
* \param arg pointer to a drm_buf_info structure.
* \return zero on success or a negative number on failure.
*
* Increments drm_device::buf_use while holding the drm_device::count_lock
* lock, preventing of allocating more buffers after this call. Information
* about each requested buffer is then copied into user space.
*/
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->head->dev;
drm_device_dma_t *dma = dev->dma;
drm_buf_info_t request;
drm_buf_info_t __user *argp = (void __user *)arg;
int i;
int count;
if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
return -EINVAL;
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, argp, 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 ) {
drm_buf_desc_t __user *to = &request.list[count];
drm_buf_entry_t *from = &dma->bufs[i];
drm_freelist_t *list = &dma->bufs[i].freelist;
if ( copy_to_user( &to->count,
&from->buf_count,
sizeof(from->buf_count) ) ||
copy_to_user( &to->size,
&from->buf_size,
sizeof(from->buf_size) ) ||
copy_to_user( &to->low_mark,
&list->low_mark,
sizeof(list->low_mark) ) ||
copy_to_user( &to->high_mark,
&list->high_mark,
sizeof(list->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( argp, &request, sizeof(request) ) )
return -EFAULT;
return 0;
}
/**
* Specifies a low and high water mark for buffer allocation
*
* \param inode device inode.
* \param filp file pointer.
* \param cmd command.
* \param arg a pointer to a drm_buf_desc structure.
* \return zero on success or a negative number on failure.
*
* Verifies that the size order is bounded between the admissible orders and
* updates the respective drm_device_dma::bufs entry low and high water mark.
*
* \note This ioctl is deprecated and mostly never used.
*/
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->head->dev;
drm_device_dma_t *dma = dev->dma;
drm_buf_desc_t request;
int order;
drm_buf_entry_t *entry;
if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
return -EINVAL;
if ( !dma ) return -EINVAL;
if ( copy_from_user( &request,
(drm_buf_desc_t __user *)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;
}
/**
* Unreserve the buffers in list, previously reserved using drmDMA.
*
* \param inode device inode.
* \param filp file pointer.
* \param cmd command.
* \param arg pointer to a drm_buf_free structure.
* \return zero on success or a negative number on failure.
*
* Calls free_buffer() for each used buffer.
* This function is primarily used for debugging.
*/
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->head->dev;
drm_device_dma_t *dma = dev->dma;
drm_buf_free_t request;
int i;
int idx;
drm_buf_t *buf;
if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
return -EINVAL;
if ( !dma ) return -EINVAL;
if ( copy_from_user( &request,
(drm_buf_free_t __user *)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->filp != filp ) {
DRM_ERROR( "Process %d freeing buffer not owned\n",
current->pid );
return -EINVAL;
}
drm_free_buffer( dev, buf );
}
return 0;
}
/**
* Maps all of the DMA buffers into client-virtual space (ioctl).
*
* \param inode device inode.
* \param filp file pointer.
* \param cmd command.
* \param arg pointer to a drm_buf_map structure.
* \return zero on success or a negative number on failure.
*
* Maps the AGP or SG buffer region with do_mmap(), and copies information
* about each buffer into user space. The PCI buffers are already mapped on the
* addbufs_pci() call.
*/
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->head->dev;
drm_device_dma_t *dma = dev->dma;
drm_buf_map_t __user *argp = (void __user *)arg;
int retcode = 0;
const int zero = 0;
unsigned long virtual;
unsigned long address;
drm_buf_map_t request;
int i;
if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
return -EINVAL;
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, argp, sizeof(request) ) )
return -EFAULT;
if ( request.count >= dma->buf_count ) {
if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP)) ||
(drm_core_check_feature(dev, DRIVER_SG) && (dma->flags & _DRM_DMA_USE_SG)) ) {
drm_map_t *map = dev->agp_buffer_map;
if ( !map ) {
retcode = -EINVAL;
goto done;
}
#if LINUX_VERSION_CODE <= 0x020402
down( &current->mm->mmap_sem );
#else
down_write( &current->mm->mmap_sem );
#endif
virtual = do_mmap( filp, 0, map->size,
PROT_READ | PROT_WRITE,
MAP_SHARED,
(unsigned long)map->offset );
#if LINUX_VERSION_CODE <= 0x020402
up( &current->mm->mmap_sem );
#else
up_write( &current->mm->mmap_sem );
#endif
} else {
#if LINUX_VERSION_CODE <= 0x020402
down( &current->mm->mmap_sem );
#else
down_write( &current->mm->mmap_sem );
#endif
virtual = do_mmap( filp, 0, dma->byte_count,
PROT_READ | PROT_WRITE,
MAP_SHARED, 0 );
#if LINUX_VERSION_CODE <= 0x020402
up( &current->mm->mmap_sem );
#else
up_write( &current->mm->mmap_sem );
#endif
}
if ( virtual > -1024UL ) {
/* Real error */
retcode = (signed long)virtual;
goto done;
}
request.virtual = (void __user *)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( argp, &request, sizeof(request) ) )
return -EFAULT;
return retcode;
}
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